B.Braun Dialog+ Service manual 2

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2. Technical System Description 1/2003 2 - 1

Table of Content s Page

General Information 2-7

2.1 Overview Sub-Racks 2-8

2.1.1 Legend Overview Sub-Racks 2-8

2.2 Top Level Sub-Rack 2-9

2.2.1 Legend Top Level Sub-Rack 2-9

2.3 UF Sub-Rack 2-10

2.3.1 Legend UF Sub-Rack 2-10

2.4 DF Sub-Rack 2-11

2.4.1 Legend DF Sub-Rack 2-11

2.5 Water Inlet Sub-Rack 2-12

2.5.1 Legend Water Inlet Sub-Rack 2-12

2.6 Rinsing Bridge 2-13

2.6.1 Legend Rinsing Bridge 2-13

2.7 Rear Door 2-14

2.7.1 Legend Rear Door 2-14

2.8 TFT Monitor 2-15

2.8.1 Legend TFT Monitor 2-15

2.9 Power Board 1 PB1 2-16

2.9.1 Legend Power Board 1 PB1 2-16

2.10 Power Board 2 PB2 2-17

2.10.1 Legend Power Board 2 PB2 2-17

2.11 Supervisor Board SB 2-18

2.11.1 Legend Supervisor Board SB 2-18

2.12 Controller Board CB 2-19

2.12.1 Legend Controller Board CB 2-19

2.13 Switch Mode Power Supply SMPS (Benning) 2-20

2.13.1 Legend Switch Mode Power Supply SMPS 2-20

2.14 Front Door 2-21

2.14.1 Legend Front Door 2-21

2.15 Flow Diagram 2-22

MT-MD-DE08C M.KAY

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B. Braun Medizintechnologie GmbH

2. Technical System Description 1/2003 2 - 2

2.15.1 Legend Flow Diagram 2-23

2.16 Description Flow Diagram 2-25

2.16.1 Water Inlet Section with Upline Tank 2-25

2.16.2 Degassing Circuit with Temperature System 2-26

2.16.3 Dialysate Processing 2-27

2.16.4 Central Bicarbonate and Concentrate Supply 2-28

2.16.5 BIC Cartridge Holder 2-28

2.16.6 Balance Chamber System 2-29

2.16.7 Working Principle Balance Chamber System 2-29

2.16.8 Ultrafiltration and Rinsing Bridge 2-31

2.16.9 Disinfection and Cleaning Program 2-31

2.17 Block Diagram 2-32

2.17.1 Legend Block Diagram 2-33

2.18 TFT Monitor 2-35

2.18.1 Description TFT Monitor 2-35

2.19 ABPM Option (Non-Invasive Blood Pressure Measurement) 2-37

2.19.1 Wiring Diagram ABPM Option 2-37

2.20 bioLogic RR Option (Automatic Blood Pressure Stabilisation) 2-38

2.21 Supervisor Board SB 2-39

2.21.1 Supervisor 2-39

2.21.1.1 Block Diagram Supervisor 2-39

2.21.1.2 Description Supervisor 2-39

2.22 Bicarbonate Conductivity Measurement 2-41

2.22.1 Block Diagram Bicarbonate Conductivity Measurement 2-41

2.22.2 Description Bicarbonate Conductivity Measurement 2-41

2.23 END Conductivity Measurement Controller 2-42

2.23.1 Description END Conductivity Measurement Controller 2-42

2.23.2 END Conductivity Measurement Supervisor 2-42

2.23.3 Block Diagram END Conductivity Measurement Supervisor 2-42

2.23.4 Description END Conductivity Measurement Supervisor 2-42

2.24 Temperature Measurement 2-43

2.24.1 Block Diagram Degassing Temperature Measurement 2-43

2.24.2 Design Degassing Temperature Measurement 2-43

2.24.3 Description Bicarbonate Temperature Measurement 2-43

MT-MD-DE08C M.KAY

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B. Braun Medizintechnologie GmbH

2. Technical System Description 1/2003 2 - 3

2.24.4 Description Dialysate Controller Temperature Measurement 2-43

2.24.5 Block Diagram Dialysate Supervisor Temperature

2-44

Measurement

2.24.6 Description Temperature Measurement Dialysate Supervisor 2-44

2.25 Level Measurement 2-44

2.25.1 Block Diagram Level Measurement Upline Tank 2-44

2.25.2 Description Level Measurement Upline Tank 2-44

2.26 Reed Contacts 2-45

2.26.1 Block Diagram Coupling Status 2-45

2.26.2 Description Coupling Status 2-45

2.27 Pressure Measurement 2-45

2.27.1 Block Diagram Venous Pressure Measurement 2-45

2.27.2 Description Venous Pressure Measurement 2-45

2.27.3 Block Diagram Arterial Pressure Measurement 2-46

2.27.4 Description Arterial Pressure Measurement 2-46

2.28 Blood Inlet Pressure Measurement 2-46

2.28.1 Block Diagram Blood Inlet Pressure Measurement 2-46

2.28.2 Description Blood Inlet Pressure Measurement 2-46

2.29 Level Sensors 2-47

2.29.1 Block Diagram Level Sensors Air Separator 2-47

2.29.2 Description Level Sensors Air Separator 2-47

2.30 Red Detector 2-47

2.30.1 Block Diagram Red Detector 2-47

2.30.2 Description Red Detector 2-47

2.31 Degassing Pressure Measurement and Dialysate Pressure

2-48

Measurement

2.31.1 Block Diagram Pressure Measurement 2-48

2.31.2 Description Pressure Measurement 2-48

2.32 Monitoring Analogue 12 V Voltage Supply 2-48

2.32.1 Block Diagram Monitoring of Analogue 12 V Voltage Supply 2-48

2.32.2 Description Monitoring of Analogue 12 V Voltage Supply 2-48

MT-MD-DE08C M.KAY

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B. Braun Medizintechnologie GmbH

2. Technical System Description 1/2003 2 - 4

2.33 Safety Air Detector SAD and Venous Red Detector RDV 2-49

2.33.1 Block Diagram SAD/RDV 2-49

2.33.2 General Information SAD 2-49

2.33.3 Description Safety Air Detector SAD 2-50

2.33.4 Description Venous Red Detector RDV 2-52

2.34 Blood Leak Detector 2-53

2.34.1 Block Diagram Blood Leak Detector 2-53

2.34.2 Description Blood Leak Detector 2-53

2.35 Controller Board CB 2-54

2.35.1 Block Diagram Controller Board 2-54

2.35.2 Description Controller Board 2-55

2.36 Power Board 1 PB1 2-57

2.36.1 Block Diagram Power Board 1 2-57

2.36.2 Description Power Board 1 2-57

2.37 Power Board 2 PB2 2-59

2.37.1 Block Diagram Power Board 2 2-59

2.37.2 Description Power Board 2 2-60

2.38 Heparin Pump Compact 2-62

2.38.1 Block Diagram Heparin Pump Compact 2-62

2.38.2 Description Heparin Pump Compact 2-62

2.39 Single Needle Cross Over 2-64

2.39.1 Block Diagram SN Cross Over 2-64

2.39.2 Description SN Cross Over 2-65

2.40 Staff Call (Option) 2-66

2.40.1 Block Diagram Staff Call 2-66

2.40.2 Description Staff Call 2-66

2.40.3 Operating Modes Staff Call System 2-67

2.40.4 Block Diagram Alarm Monitoring 2-67

2.40.5 Pin Assignment 2-67

2.41 Switch Mode Power Supply SMPS (Benning) 2-68

2.41.1 Block Diagram Switch Mode Power Supply 2-68

2.41.2 System Integration 2-69

2.41.3 Layout Switch Mode Power Supply SMPS 2-70

2.41.4 Wiring Diagram Switch Mode Power Supply SMPS with Battery Option

2.41.5 Description Switch Mode Power Supply 2-72

MT-MD-DE08C M.KAY

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2-71

B. Braun Medizintechnologie GmbH

2. Technical System Description 1/2003 2 - 5

2.41.6 Pin Assignment Switch Mode Power Supply 2-72

2.42 Safety Concept 2-77

2.42.1 Block Diagram Safety Concept 2-77

2.42.2 Description Safety Concept 2-78

MT-MD-DE08C M.KAY

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B. Braun Medizintechnologie GmbH

2. Technical System Description 1/2003 2 - 6

with the options:

Double Pump

•

BIC Cartridge Holder

•

Central Concentrate Supply

•

MT-MD-DE08C M.KAY

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B. Braun Medizintechnologie GmbH

General Information

2. Technical System Description 1/2003 2 - 7

Operation is accomplished via a touch screen (TFT monitor). Two

microprocessor systems control and monitor the machine.

The hardware concept consists of the following systems:

Top Level System

•

Low Level System

•

Top Level System

Low Level System

The top level system consists of the following components:

Communication module

•

Top level controller TLC (motherboard)

•

Hard disk drive

•

Floppy disk drive

•

ABPM (option)

•

The communication between the user and the machine is performed via the

top level. Example data exchange to communication module:

Entry via input mask of the touch screen or keyboard

•

Output via the output mask of the TFT monitor

•

Example data exchange to low level:

Transmitting and receiving of data from/to low level controller

•

The low level system consists of the following components:

Low level controller LLC

•

Supervisor SB

•

Power board PB1 and power board PB2

•

The low level controls and monitors all functions.

Example data exchange to top level controller:

Transmitting and receiving of data from/to low level controller

•

Example data exchange low level controller to supervisor:

Transmitting and receiving messages, data and commands from/to supervisor

•

All sensors are connected to the processor system via the supervisor board. The actuators, motors and valves are driven via the power boards 1 and 2.

MT-MD-DE08C M.KAY

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B. Braun Medizintechnologie GmbH

2. Technical System Description 1/2003 2 - 8

2.1 Overview Sub-Racks

Fig. : Overview Sub-Racks Rear View Dialog+

2.1.1 Legend Overview Sub-Racks

MT-MD-DE08C M.KAY

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Top Level Sub-Rack

UF Sub-Rack

DF Sub-Rack

Water Inlet Sub-Rack

B. Braun Medizintechnologie GmbH

2. Technical System Description 1/2003 2 - 9

2.2 Top Level Sub-Rack

Fig. : Top Level Sub-Rack

2.2.1 Legend Top Level Sub-Rack

1 Hard Disk Drive

11 2222 Motherboard

MT-MD-DE08C M.KAY

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B. Braun Medizintechnologie GmbH

2. Technical System Description 1/2003 2 - 10

2.3 UF Sub-Rack

Fig. : UF Sub-Rack

2.3.1 Legend UF Sub-Rack

Air Separator LA Air Separator Valve VLA Balance Chamber BK1/2 Bypass Valve VBP Dialyser Inlet Throttle DDE Dialyser Inlet Valve VDEBK1 Dialyser Inlet Valve VDEBK2 Dialyser Outlet Valve Balance Chamber VABK1

MT-MD-DE08C M.KAY

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LALA

VBP

VBPVBP

VLA

VLAVLA

BK1/2

BK1/2BK1/2

VDEBK1

VDEBK1VDEBK1 VDEBK2

VDEBK2VDEBK2

DDE

DDEDDE

VABK1

VABK1VABK1

Dialyser Outlet Valve Balance Chamber VABK2 Dialyser Dialyser Outlet Valve Balance Chamber VDABK1 Dialyser Dialyser Outlet Valve Balance Chamber VDABK2 Inlet Valve Balance Chamber VEBK1 Inlet Valve Balance Chamber VEBK2 Membrane Position Sensor Balance Chamber MSBK1/2 Outlet Flow Pump FPA Outlet Flow Pump Throttle RVFPA

FPA

FPAFPA

VEBK1

VEBK1VEBK1 VEBK2

VEBK2VEBK2

RVFPA

RVFPARVFPA

VABK2

VABK2VABK2

VDABK1

VDABK1VDABK1 VDABK2

VDABK2VDABK2

MSBK1/2

MSBK1/2MSBK1/2

B. Braun Medizintechnologie GmbH

2. Technical System Description 1/2003 2 - 11

2.4 DF Sub-Rack

Fig. : DF Sub-Rack

2.4.1 Legend DF Sub-Rack

BIC Pump BICP Bicarbonate Conductivity BICLF Bicarbonate Temperature Sensor TSBIC Bicarbonate Throttle RVB Concentrate Pump KP Concentrate Throttle RVK Degassing Chamber EK Degassing Control Valve RVE

MT-MD-DE08C M.KAY

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BICP

BICPBICP

KPKP

RVB

RVBRVB

EKEK

RVK

RVKRVK

BICLF

BICLFBICLF

RVE

RVERVE

TSBIC

TSBICTSBIC

Degassing Pressure Sensor PE Degassing Pump EP Dialysate Temperature Sensor Supervisor TSD-S Dialysate Temperature Sensor TSD END Conductivity/Supervisor ENDLF/ENDLF-S Inlet Flow Pump FPE Inlet Flow Pump Throttle RVFPE UF Pump UFP

UFP

UFPUFP

EPEP

FPE

FPEFPE

PEPE

TSD

TSDTSD

ENDLF/ENDLF-S

ENDLF/ENDLF-SENDLF/ENDLF-S

RVFPE

RVFPERVFPE

TSD-S

TSD-STSD-S

B. Braun Medizintechnologie GmbH

2. Technical System Description 1/2003 2 - 12

2.5 Water Inlet Sub-Rack

RVDA

Outlet

Ausgang

Fig. : Water Inlet Sub-Rack (with and without Heat Exchanger WT Option)

2.5.1 Legend Water Inlet Sub-Rack

Degassing Chamber EK Degassing Control Valve RVE Degassing Pressure Sensor PE Degassing Pump EP Degassing Temperature Sensor TSE Heat Exchanger WT

EKEK

RVE

RVERVE

EPEP

WT (Option)

WTWT

PEPE

TSE

TSETSE

Heater HHHH Heater Inlet Temperature Sensor TSHE Heater Temperature Sensor TSH Pressure Reducer Valve DMV Upline Tank Inlet Valve VVBE Upline Tank VB

VBVB

DMV

DMVDMV

VVBE

VVBEVVBE

TSH

TSHTSH

TSHE

TSHETSHE

MT-MD-DE08C M.KAY

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B. Braun Medizintechnologie GmbH

2.6 Rinsing Bridge

2. Technical System Description 1/2003 2 - 13

Fig. : Rinsing Bridge

2.6.1 Legend Rinsing Bridge

234

PDA

VDE

1 Disinfection Valve VD

11 2222 Pressure Sensor Dialysate Outlet PDA

VDVD

PDA

PDAPDA

3333 Dialyser Inlet Valve VDE 4444 Blood Leak Detector BL

VDE

VDEVDE

BLBL

MT-MD-DE08C M.KAY

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B. Braun Medizintechnologie GmbH

2.7 Rear Door

2. Technical System Description 1/2003 2 - 14

HOP

PB2

BIC-KV

PB1

SMPS

Fig. : Rear Door

2.7.1 Legend Rear Door

MT-MD-DE08C M.KAY

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BIC Cartridge Holder Board BIC-KV Controller Board CB HDF Online Power Board HOP HFS 2 Board HFS2 Fan (1111) Power Board 1 PB1

CBCB

HFS2 with TSHE (Option) (2222)

HFS2HFS2

PB1

PB1PB1

BIC-KV (Option)

BIC-KVBIC-KV

HOP (Option)

HOPHOP

Power Board 2 PB2 SAKA Board SAKA Switch Mode Power Supply SMPS Supervisor Board SB Heater Inlet Temperature Sensor Board TSHE

PB2

PB2PB2

SAKA with TSHE (Option) (2222)

SAKASAKA

SMPS

SMPSSMPS

SBSB

TSHE (2222)

TSHETSHE

B. Braun Medizintechnologie GmbH

2.8 TFT Monitor

2. Technical System Description 1/2003 2 - 15

Fig. : TFT Monitor

2.8.1 Legend

MT-MD-DE08C M.KAY

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TFT Monitor

Backlight Inverter Board Front Panel Board TFT Monitor

FPB

TFT

BIB

Optical Status Display Board Touch Controller Board Touch Screen

TCB

OSDB

B. Braun Medizintechnologie GmbH

2.9 Power Board 1 PB1

2. Technical System Description 1/2003 2 - 16

C37

V22

V20

R75

C50

R71

V21

R312

C148 C147 C146

V10

C93

V13

C124C117

C39

C62

V24

V23

C65

C64

C86

V27

V26

R186

C89

C34

C15

V19

V17

R14R131

C18

R127 R1

V25

C128C127C126 C125

R182

V11

V28

V18

U15U14U13 U12

V40

V39V38V37 V36 V35V34 V33 V32 V31 V30 V29

Fig. : Power Board 1 PB1

2.9.1 Legend Power Board 1 PB1

P1 Arterial Blood Pump BPA

P1P1 P2

P2 Supervisor Board SB

P2P2 P3

P3 Voltage Supply

P3P3 P4

P4 Sensors Blood Pump

P4P4

Cover switch

SBSB

BPA

BPABPA

C17

P5 Inlet Flow Pump FPE

P5P5 P6

P6 Outlet Flow Pump FPA

P6P6 P7

P7 Degassing Pump EP

P7P7

FPE

FPEFPE EP

EPEP

FPA

FPAFPA

MT-MD-DE08C M.KAY

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B. Braun Medizintechnologie GmbH

2.10 Power Board 2 PB2

C78

2. Technical System Description 1/2003 2 - 17

U26U25U24

Fig. : Power Board 2 PB2

2.10.1 Legend Power Board 2 PB2

P1 for Valves and SAKV:

P1P1

Upline Tank Inlet Valve RVVB Degassing Control Valve RVE Venous Tubing Clamp Currentles Closed SAKV-SG Dialyser Outlet Valve VDA Dialyser Inlet Valve VDE Balance Chamber Valves VABK1/2, VDABK1/2, VEBK1/2, VDEBK1/2 Air Separator Valve VLA Circulation Valve VZ Bypass Valve VBP

VBP

VBPVBP

RVVB

RVVBRVVB

RVE

RVERVE

SAKV-SG

SAKV-SGSAKV-SG

VDA

VDAVDA

VDE

VDEVDE

VABK1/2, VDABK1/2, VEBK1/2, VDEBK1/2

VABK1/2, VDABK1/2, VEBK1/2, VDEBK1/2VABK1/2, VDABK1/2, VEBK1/2, VDEBK1/2

VLA

VLAVLA

VZVZ

V47V46V45V44V43V42V41V40V39V38V37V36V35V34V33V32

P2 Supervisor Board SB

P2P2 P3

P3 Piston Pumps:

P3P3

Concentrate Pump KP Bicarbonate Pump BICP Ultrafiltration Pump UFP

P4 Voltage Supply

P4P4 P5

P5 Disinfection Valve VD

P5P5

SBSB

VDVD

KP,

KPKP

BICP,

BICPBICP

UFP

UFPUFP

C93

C83

MT-MD-DE08C M.KAY

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B. Braun Medizintechnologie GmbH

2.11 Supervisor Board SB

2. Technical System Description 1/2003 2 - 18

P11 P12 P8 P5

14 P7

P10 P15

P13P17

P19 K1 P2 P3 P18 P23 P1 P4 P16

Fig. : Supervisor Board SB

2.11.1 Legend Supervisor Board SB

P13

P1/P2/P3

P1/P2/P3 Controller Board CB

P1/P2/P3P1/P2/P3 P4

P4 BICSS/KSS/RDVLED/SAD RTS/TX/CTS/RX Signals

P4P4 P5

P5 Staff Call Signals

P5P5 P6

P6 BPV/PBS/SAKA Signals

P6P6 P7

P7 BL Signals

P7P7 P8

P8 REM/HOFF/HREL Signals

P8P8 P9

P9 SCB-RX/TX/CTS/RTS Signals

P9P9 P10

P10 BP/EP/FP Signals

P10P10 P11

P11 VVBE/KP/BICP/UFP/SKAV/VDE/VDA Signals

P11P11 P12

P12 Heparin Pump Signals

P12P12

CBCB

P13 Pressure Sensor PBE

P13P13 P14

P14 Voltages +5 V/+24 VL/+24 VGB/+12 VAN/-12 VAN

P14P14 P15

P15 ENDLF/ENDLF-S/BICLF/TSD/TSD-S/TSBIC/TSE Signals

P15P15 P16

P16 Voltages +5 VREF/+12 VAN/-12 VAN

P16P16 P17

P17 Voltages +5 V/12 VD/-12 VD

P17P17 P18

P18 Extension Connector

P18P18 P19

P19 Communication Program Adapter

P19P19 K1

K1 Hardware Switch:

K1K1

Position 0: Therapy Mode Position 2: TSM Service Program Mode Position 3: Software Update Mode

PBE

PBEPBE

MT-MD-DE08C M.KAY

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B. Braun Medizintechnologie GmbH

2.12 Controller Board CB

2. Technical System Description 1/2003 2 - 19

P1P3P5P2

U9 U8U6

U22

U25

U51

Fig. : Controller Board CB

U18

U26

U33

2.12.1 Legend Controller Board CB

P1/P2/P3

P1/P2/P3 Supervisor Board SB

P1/P2/P3P1/P2/P3

SB P5

SBSB

P5 Program Adapter with Memory Card

P5P5

U12U11 U10

MT-MD-DE08C M.KAY

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B. Braun Medizintechnologie GmbH

2. Technical System Description 1/2003 2 - 20

2.13 Switch Mode Power Supply SMPS (Benning)

PE3 N3 L3 N2 L2

PE L N PE L1 N1

X1.3 X1.1 X1.2 X1.6 X1.5 X1.4

Fig. : Switch Mode Power Supply SMPS (Benning)

F1 T6.25A 6.3x32 F2 T6.25A 6.3x32 F3 T3.15A TR5 F4 T3.15A TR5

F5/F6 - 110/ 120V: F20A 6.3x32

- 230V: M10A 6.3x32

F301 T3.15A TR5 F302 T5.0A TR5 F303 T3.15A TR5 F304 T3.15A TR5 F401 T1.25A TR5 F402 T5.00A TR5 F403 T1.25A TR5 F500 T3.15A TR5 F600 M10.00A 6.3x32 F601 T3.15A TR5 F602 T3.15A TR5

+12VD / F401 - T1.25A TR5 +12VD / F402 - T5.00 A TR5

+12VAN / F4 03 - T1.25A TR5

+5VD / F303 - T3.15A TR5 +5VD / F30 2 - T5 . 00A TR5 +5VD / F301 - T3.15A TR5 +5VD / F304 - T3.15A TR5

+24 VGB / F602 - T3.15A TR5

+24VGB / F601 - T3.15A TR5

+24V

X100

LED

P13

F401 F402

F403

F303 F302

F301 F304

F602 F601

P101

3 1

P12

P10

2.13.1 Legend Switch Mode Power Supply SMPS

X1 Mains Input, Heater

X1X1 X2

X2 -

X2X2 X3

X3 Fluid Warmer (via Relay)

X3X3 P2

P2 Supervisor/Watchdog, Service Board

P2P2 P3

P3 Battery Connection (Screw Terminal)

P3P3 P4

P4 Power Board 1/2

P4P4 P5

P5 Supervisor/Controller Board

P5P5 P6

P6 Floppy Disk Drive

P6P6 P7

P7 Options, Service Board (Service Tool)

P7P7 F1/F2

F1/F2 6.25 AT (6.3x32), Mains Input

F1/F2F1/F2 F3/F4

F3/F4 3.15 AT (TR5), Fluid Warmer + Monitor

F3/F4F3/F4 F5/F6

F5/F6 10 AM (6.3x32), Heater 1800 W (240 V)

F5/F6F5/F6

20 AF (6.3x32), Heater 1800 W (110/120 V)

F301

F301 3.15 AT (TR5), +5 VD

F301F301 F302

F302 5.00 AT (TR5), +5 VD

F302F302 F303/

F303/ 3.15 AT (TR5), +5 VD

F303/F303/ F304

F304

F304F304

P8 ABPM

P8P8 P9

P9 Fan, Mains Switch

P9P9 P10

P10 PC

P10P10 P11

P11 Hard Disk Drive

P11P11 P12

P12 Options

P12P12 P13

P13 -

P13P13 P14

P14 EXT ON

P14P14 P101

P101 Service Watchdog

P101P101 X100

X100 Fan

X100X100 F401

F401 1.25 AT (TR5), +12 VD

F401F401 F402

F402 5.00 AT (TR5), +12 VD

F402F402 F403

F403 1.25 AT (TR5), +12 VAN

F403F403 F600

F600 10 AM (6.3x32), +24 VL

F600F600 F601/

F601/ 3.15 AT (TR5), +24 VGB

F601/F601/ F602

F602

F602F602

MT-MD-DE08C M.KAY

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B. Braun Medizintechnologie GmbH

2.14 Front Door

2. Technical System Description 1/2003 2 - 21

PV PA PBS/SN PBE

PBA PBV

SAD

SAKV-SG

SAKA

PV PA

SAD

PBA PBV

PBS/SN

PBE

1111

2222

SAKASAKV-SG

2222

Fig. : Front Door

2.14.1 Legend Front Door

Arterial Blood Pump BPA Arterial Pressure Sensor PA Arterial Tubing Clamp SAKA-SG

BPA

BPABPA

PAPA

SAKA-SG

SAKA-SGSAKA-SG Cover for Suction Rods 2222 Heparin Pump Compact HP Pressure Sensor PBE

PBE

PBEPBE

HPHP

Pressure Sensor PBS/SN Safety Air Detector SAD

PBS/SN

PBS/SNPBS/SN

SAD/Venous Red Detector RDV

SADSAD

RDV

RDVRDV Substitution Port 1111 Venous Blood Pump BPV Venous Pressure Sensor PV Venous Tubing Clamp Currentles Closed SAKV-SG

BPV

BPVBPV

PVPV

SAKV-SG

SAKV-SGSAKV-SG

MT-MD-DE08C M.KAY

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B. Braun Medizintechnologie GmbH

MT-MD-DE08C M.KAY

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2.15 Flow Diagram

PBE

PVPVPA

PBE

Double-NeedlePBS

TSETSH

EP EK PE

Water Sub-Rack

Wasser-Einschub

TSHE

DBK

LAB1

VBKO

B. Braun Medizintechnologie GmbH

VVBE

DMV

VVB

BICP

RVE

SAD

RDV

SAKV-SG

SAKA

DF Sub-Rack

DF-Einschub

NSVB

C A

BPVBPA

Single-Needle

UF Sub-Rack

UF-Einschub

SAD RDV

SAKV-SG

Pyrogen Fi l t er

Pyrogenfilter

BPA

Rinsing Bridge

Spülbrücke

2. Technical System Description 1/2003 2 - 22

DDE

RVB

TSBIC

BICLF

RVK TSD TSD-S

ENDLF-SENDLF

FPE

FBK1

VDEBK1

VEBK1

VDEBK2

MSBK1

BK1

VABK1

VDABK1

VABK2

VBP

VLA

VDE

V.D.

Z.D.

Dialysator

Dialyser

LAB2

VBICP

FBIC

VBKS

Zentrale

Bicarbonat-

Versorgung

Central

Bicarbonate

Supply

RVDA

UFP

FBK2

LAFS

FPA

RVFPA

BL PDA

Luft

SBS1

Air

LVD

SBS2

VEBK2

MSBK2

VDABK2

BK2

FVD

Luft Air

Wasser Water

Bicarbonat Bicarbonate

Konzentrat Concentrate

Dialysierfluß 1 Dialysate Flow 1

Dialysierfluß 2 Dialysate Flow 2

Dialysierflüssigkeit Dialysate

Desinfektionsmittel Disinfectant

Optionen Options

Wasser Z U

Water Inlet

Dialysat AB Dialysate Outlet

BKUS

Blut Arteriell Blood Arterial

Blut Venös Blood Venous

Heparin

BVA

BICSS

BIC-Konzentrat

BIC Conce ntrate

KSS

Konzentrat

Säurekonzentrat

Concentrate

Aci d C oncentrat e

KVA

Zentrale

Konzentrat-

Versorgung

Central

Concentrate

Supply

Disinfectant (Rear Side of Unit) Desinfektionsmittel

(Geräterückseite)

2.15.1 Legend Flow Diagram

Abbreviation Description

2. Technical System Description 1/2003 2 - 23

BE BICLF BICP BICSS BK1 BK2 BL BPA BPV BVA DBK DDE DMV EK ENDLF ENDLF-S EP FB FBIC FBK1 FBK2 FK FM FPA FPE FVD H HP KE KP KSS KVA LA LAB1 LAB2 LAFS LVD MSBK1 MSBK2 NSVB PA PBE PBS PDA PE PV

Bicarbonate Withdrawal Rod Bicarbonate Conductivity Bicarbonate Pump Bicarbonate Rinsing Connection Sensor Balance Chamber 1 Balance Chamber 2 Blood Leak Detector Arterial Blood Pump Venous Blood Pump Bicarbonate Supply Connection (Central Supply) Throttle Bicarbonate Cartridge Holder Throttle Dialyser Inlet Pressure Reducer Valve Degassing Chamber END Conductivity END Conductivity Supervisor Degassing Pump Filter Bicarbonate Filter Bicarbonate Cartridge Filter Balance Chamber 1 Filter Balance Chamber 2 Filter Concentrate Flowmeter Outlet Flow Pump Inlet Flow Pump Filter from Dialysate Heater Heparin Syringe Pump Concentrate Withdrawal Rod Concentrate Pump Concentrate Rinsing Connector Sensor Concentrate Supply Connector (Central Supply) Air Separator Air Separator BIC Cartrige Holder 1 Air Separator BIC Cartrige Holder 2 Air Separator Level Sensors Light Barrier Disinfection Valve Membrane Position Sensor Balance Chamber 1 Membrane Position Sensor Balance Chamber 2 Level Sensor Upline Tank Arterial Pressure Sensor Pressure Sensor Blood Inlet Blood Pressure Control Sensor Pressure Sensor Dialysate Outlet Degassing Pressure Sensor Venous Pressure Sensor

MT-MD-DE08C M.KAY

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B. Braun Medizintechnologie GmbH

2. Technical System Description 1/2003 2 - 24

RDV RVB RVDA RVE RVFPA RVFPE RVK RVUF SAD SAKA SAKV-SD SBS1 SBS2 TSBIC TSD TSD-S TSE TSH TSHE UFP VABK1 VABK2 VB VBICP VBKO VBKS VBP V.D. VD VDA VDABK1 VDABK2 VDE VDEBK1 VDEBK2 VEBK1 VEBK2 VLA VVB VVBE VZ WT Z.D.

Venous Red Detector Throttle Bicarbonate Throttle Dialysate Valve Degassing Control Valve Throttle Flow Pump Outlet Throttle Flow Pump Inlet Throttle Concentrate Throttle Ultrafiltration Safety Air Detector Arterial Tubing Clamp Venous Tubing Clamp Currentles Closed Rinsing Bridge Connector Sensor 1 Rinsing Bridge Connector Sensor 2 Bicarbonate Temperature Sensor Dialysate Temperature Sensor Dialysate Temperature Sensor Supervisor Degassing Temperarture Sensor Thermal Fuse Heater Element Heater Inlet Temperature Sensor Ultrafiltration Pump Outlet Valve Balance Chamber 1 Outlet Valve Balance Chamber 2 Upline Tank Bicarbonate Pump Valve Bicarbonate Cartridge Holder Top Valve Bicarbonate Cartridge Holder Concentrate Rod Valve Bypass Valve Dialyser Coupling (from Dialysate) Disinfection Valve Dialyser Outlet Valve Dialyser Outlet Valve Balance Chamber 1 Dialyser Outlet Valve Balance Chamber 2 Dialyser Inlet Valve Dialyser Inlet Valve Balance Chamber 1 Dialyser Inlet Valve Balance Chamber 2 Inlet Valve Balance Chamber 1 Inlet Valve Balance Chamber 2 Air Separator Valve Upline Tank Valve Upline Tank Inlet Valve Circulation Valve Heat Exchanger Dialyser Coupling (to Dialysate)

MT-MD-DE08C M.KAY

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B. Braun Medizintechnologie GmbH

2. Technical System Description 1/2003 2 - 25

2.16 Description Flow Diagram

The flow diagram can be divided into six sections:

2.16.1 Water Inlet Section with Upline Tank

The water inlet section has the following components

Water Inlet Section with Upline Tank

•

Degassing Circuit with Temperature System

•

Dialysate Processing

•

Balance Chamber

•

Ultrafiltration

•

Rinsing Bridge

•

TSE

Pressure Reducer Valve DMV

•

Upline Tank Inlet Valve VVVVVBE

•

Upline Tank VB

•

Level Sensors Upline Tank NSVB

•

Heat Exchanger WT

•

VBVB

DMV

DMVDMV

WT (Option)

WTWT

KSS

NSVB

RVE

RVB

VBE (2/2 way valve)

VBEVBE

NSVB

NSVBNSVB

Pressure Reducer Valve DMV

Pressure Reducer Valve DMVPressure Reducer Valve DMV The pressure reducer valve DMV limits the

pressure of the inlet water (e.g. osmosis water) to a maximum of approx. 1.3 bar.

Upline Tank Inlet Valve

Upline Tank Inlet Valve VVVVVBE

Upline Tank Inlet Valve Upline Tank Inlet Valve The valve VVBE is time-delayed controlled via

the level sensor NSVB (top) in the upline tank VB. The delay time depends on the dialysate flow.

Level Sensors Upline Tank NSVB

Level Sensors Upline Tank NSVBLevel Sensors Upline Tank NSVB The level sensors are mounted in the upline

tank.

VBE

VBEVBE

VVBE

DMV

Fig. : Water Inlet with Upline Tank

MT-MD-DE08C M.KAY

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RVDA

NSVB

NSVB top:

NSVBNSVB closed - VVBE is closed

NSVB

NSVB bottom (monitoring low water level):

NSVBNSVB closed (alarm) - Water inlet is disturbed

- Heater is switched off

Heat Exchanger WT (Option)

Heat Exchanger WT (Option)Heat Exchanger WT (Option) The cold inlet water can be warmed up via the

optional heat exchanger WT. Thereby the heat consumption to heat up the water can be reduced.

B. Braun Medizintechnologie GmbH

2.16.2 Degassing Circuit with Temperature System

2. Technical System Description 1/2003 2 - 26

The degassing circuit with temperature system has the following components:

Degassing Control Valve RVE

•

RVE

RVERVE

Degassing Control Valve RVE

Degassing Control Valve RVEDegassing Control Valve RVE

Degassing Pressure Sensor PE

Degassing Pressure Sensor PEDegassing Pressure Sensor PE

Degassing Pump EP

Degassing Pump EPDegassing Pump EP

Heater Element H

Heater Element HHeater Element H

Thermal Fuse Heater Element TSH

Thermal Fuse Heater Element TSHThermal Fuse Heater Element TSH

Degassing Temperature Sensor TSE

Degassing Temperature Sensor TSEDegassing Temperature Sensor TSE

Degassing Pressure Sensor PE

•

Degassing Chamber EK

•

Degassing Pump EP

•

Thermal Fuse Heater Element TSH

•

Temperature Sensor Heater Inlet TSHE

•

Heater Element HHHH

•

Degassing Temperature Sensor TSE

•

The control valve RVE, pressure sensor PE, degassing chamber EK and degassing pump EP produce and measure a negative pressure respectively. The negative pressure is produced to separate the dissolved gas from the water.

The control valve RVE reduces the flow (throttle principle) depending on the measured pressure at the pressure sensor PE. Thereby the desired negative pressure is gained between the control valve RVE and the degassing pump EP. The value of the negative pressure is approx. -500 mmHg and thus always higher than the lower pressure of the dialysate behind the dialyser. The degassing pump works with constant speed, which is determined by the dialysate, unless the negative pressure is insufficient at the smallest opening of RVE. Then the speed of EP is increased.

The heater H has an integrated thermal fuse TSH as a thermal cut-off. The temperature sensor TSE measures the actual temperature posterior to the heater.

EPEP

EKEK

PEPE

TSH

TSHTSH

TSE

TSETSE

TSHE

TSHETSHE

TSE

Temperature Control

Temperature Control The temperature of the water inlet determines the amount of heat which the

Temperature ControlTemperature Control

heater must supply, to replace the amount of heat (dialysate flow and dialysate temperature) withdrawn by the drainage.

The differential temperature between the heater inlet (TSHE) and the heater outlet (TSE) determines the controlled variable for the heater, depending on the dialysate flow and dialysate temperature.

VLA

TSH

RVE

TSHE

zum VB/to VB

Fig. : Degassing Circuit with Temperature System

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vom VB/f rom VB

B. Braun Medizintechnologie GmbH

2.16.3 Dialysate Processing

2. Technical System Description 1/2003 2 - 27

The dialysate processing has the following components:

The main components of the dialysate preparation are the bicarbonate

Bicarbonate Concentrate Pump BICP

•

Bicarbonate Throttle RVB

•

Bicarbonate Temperature Sensor TSBIC

•

Bicarbonate Conductivity BICLF

•

Concentrate Pump KP

•

Concentrate Throttle RVK

•

END Conductivity ENDLF

•

END Conductivity Supervisor ENDLFS

•

Dialysate Temperature Sensor TSD

•

Dialysate Temperature Sensor Supervisor TSDS

•

Inlet Flow Pump FPE

•

Inlet Flow Pump Throttle RVFPE

•

concentrate pump BICP and the concentrate pump KP, with the conductivity cells BICLF and ENDLF and a flow pump FPE. The flow pump FPE delivers the dialysate. The bicarbonate concentrate, which is added via the bicarbonate pump BICP, is measured by the conductivity measurement cell BICLF. Thereby the pump can control the given conductivity set-point value.

KPKP

ENDLF

ENDLFENDLF

FPE

FPEFPE

RVB

RVBRVB

RVK

RVKRVK

BICLF

BICLFBICLF

ENDLFS

ENDLFSENDLFS

RVFPE

RVFPERVFPE

TSD

TSDTSD

BICP

BICPBICP

TSBIC

TSBICTSBIC

TSDS

TSDSTSDS

vom VB from VB

TSBIC

The concentrate or acid concentrate addition has the same working principle.

The nonreturn valves RVB and RVK stablise the dosage of the bicarbonate and concentrate.

The temperature sensors TSBIC and TSD are responsible for:

the temperature compensation of the conductivity measurement and

•

temperature measurement TSD after the addition of cold concentrate

•

(second measurement sensor for temperature system) and thus compensation of temperature loss.

The conductivity sensor ENDLFS is an independent monitoring unit (supervisor).

The geometry of the ENDLFS sensor is different (but has the same cell constant) than the ENDLF sensor of the controller. Thereby a deposit on the sensor can be identified. The temperature compensation is carried out by the temperature sensor TSDS. The temperature sensor additionally monitors the dialysate flow temperature for the supervisor. The ENDLFS and TSDS sensors have no influence on the respective control.

The throttle RVFPE prevents a high pressure build-up and thus a bursting of

tubing if the flow path is blocked behind FPE. If the set pressure is reached RVFPE is opened and the fluid can circulate.

RVFPE

BICLF

ENDLF

ENDLF-S

TSD

TSD-S

RVB

BICP

vom Bicarbonat

Fig. : Dialysate Processing

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from Bicarbonate

RVK

vom Konzentrat from Concentrate

zu Bilanzierungskamme rn

FPE

to Bal ance Chambers

B. Braun Medizintechnologie GmbH

2.16.4 Central Bicarbonate and Concentrate Supply

2.16.5 BIC Cartridge Holder

2. Technical System Description 1/2003 2 - 28

A canister or central supply can be selected via the bicarbonate and

concentrate supply connetion BVA and KVA. The supply connection is an option.

The flow pump FPE guarantees a continuous control of the desired dialysate

flow into the balance chambers.

The flow rate is determined by the filling time of the balance chamber. The flow

pump FPE is controlled via the predetermined volume of the chamber and a continuous detection of the position of the membrane.

DBK

DBK Throttle Bicarbonate Cartridge Holder

DBKDBK

LAB1

LAB1 Air Separator BIC Cartrige Holder 1

LAB1LAB1

VBKO

VBKO Bicarbonate Cartridge Holder Top Valve

VBKOVBKO

VBKS

VBKS Bicarbonate Cartridge Holder Concentrate Rod Valve

VBKSVBKS

Throttle Bicarbonate Cartridge Holder

Throttle Bicarbonate Cartridge HolderThrottle Bicarbonate Cartridge Holder DBK ensures a constant pressure (approx. 200 mmHg) during the filling of the bicarbonate cartridge.

Air Separator BIC Cartrige Holder 1

Air Separator BIC Cartrige Holder 1Air Separator BIC Cartrige Holder 1 LAB1 ensures that only fluid can enter the bicarbonate cartridge.

Bicarbonate Cartridge Holder Top Valve

Bicarbonate Cartridge Holder Top ValveBicarbonate Cartridge Holder Top Valve The bicarbonate cartridge is filled to the limit presure (200 mmHg) after VBKO opens.

Bicarbonate Cartridge Holder Concentrate Rod Valve

Bicarbonate Cartridge Holder Concentrate Rod ValveBicarbonate Cartridge Holder Concentrate Rod Valve The bicarbonate cartridge is vented during preparation and in therapy, i.e. VBKO closes and VBKS opens for a short time. This is repeated in regular intervals during threapy. VBKS is opened after the end of the therapy to empty the bicarbonate cartridge.

vom Vorlau f behälter from Upline Tank

DBK

VBICP

VBICP Bicarbonate Pump Valve

VBICPVBICP

LAB2

LAB2 Air Separator BIC Cartrige Holder 2

LAB2LAB2

VVB

VVB Upline Tank Valve

VVBVVB

VVB RVB

BICP

LAB1

Bicarbonate Pump Valve

Bicarbonate Pump ValveBicarbonate Pump Valve If VBICP is opened the liquid level in LAB2 is increased. VBICP switches the BIC pump in bypass after the end of the therapy to empty the bicarbonate cartridge.

Air Separator BIC Cartrige Holder 2

Air Separator BIC Cartrige Holder 2Air Separator BIC Cartrige Holder 2 LAB2 serves as a buffer chamber for the bicarbonat e cartridge (and canis ter) to prevent conductivity malfunctions/deviations during therapy.

Upline Tank Valve

Upline Tank ValveUpline Tank Valve VVB cuts off the main flow after the end of the therapy to empty the bicarbonate cartridge via FPE (VBICP and VBKS are opened).

BICLF

TSBIC

RVK

ENDLF

ENDLF-S

TSD

FPE

TSD-S

VBICP

LAB2

VBKO

Fig. : BIC Cartridge Holder (Option)

MT-MD-DE08C M.KAY

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FBIC

VBKS

BVA

B. Braun Medizintechnologie GmbH

2.16.6 Balance Chamber System

2. Technical System Description 1/2003 2 - 29

The balance chamber system has the following components:

Balance Chamber BK1

•

BK1

BK1BK1

2.16.7 Working Principle Balance Chamber System

Phase 1:

Balance Chamber BK2

•

Balance Chamber Dialyser Inlet Valve VDEBK1

•

Balance Chamber Inlet Valve VEBK1

•

Balance Chamber Membrane Position Sensor MSBK1

•

Balance Chamber Dialyser Outlet Valve VDABK1

•

Balance Chamber Outlet Valve VABK1

•

BK2

BK2BK2

VDEBK1 and VDEBK2

VDEBK1VDEBK1

VEBK1 and VEBK2

VEBK1VEBK1

VABK1 and VABK2

VABK1VABK1

VEBK2

VEBK2VEBK2

VDABK1 and VDABK2

VDABK1VDABK1

VABK2

VABK2VABK2

VDEBK2

VDEBK2VDEBK2

MSBK1 and MSBK2

MSBK1MSBK1

MSBK2

MSBK2MSBK2

VDABK2

VDABK2VDABK2

The measurement and control of the ultrafiltration rate is accomplished by the

double balance chamber system and the ultrafiltration pump UFP.

Both balance chambers BK1 and BK2 are identical. The chambers have flexible

membranes, which can be moved to both sides. The membranes devide the chambers into two sub-compartments. The flow direction is defined by the membranes and the eight solenoid valves. The position of the membranes is measured by inductive membrane position sensors MSBK1 and MSBK2. The membrane position sensors (ferrites) are connected to the membranes and each move in a respective coil MSBK1 and MSBK2.

The balance chamber BK1 is filled with dialysate at the beginning of phase 1. The membrane is in right position. The valves VDEBK1 and VDABK1 are opened. The balance chamber BK1 is filled by the outlet flow pump FPA, via valve VDABK1. Simultaneously the dialysate is removed from the balance chamber BK1 via valve VDEBK1. Phase 1 is completed and the membrane is in left position (see figure).

RVDA

FPE

VDEBK1

VEBK1

VDEBK2

VEBK2

MSBK1

MSBK2

The balance chamber BK2 is filled with fresh dialysate during this period. The

used dialysate from the previous phase 2 is drained (see description phase 2).

PE/RVE

BK1

BK2

VABK1

VDABK1

VABK2

VDABK2

DDE

VLA

LA_FS

FPA

UFP

RVFPA

VBP

VDA

VDE

open offen

PDA

closed geschlossen

Fig. : Phase 1 Balance Chamber

MT-MD-DE08C M.KAY

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2. Technical System Description 1/2003 2 - 30

Phase 2: After phase 1 is completed there is an automatic switch to the filled balance

chamber BK2 to obt ain a constant flow in the dialyse r. The complete cylce is repeated in phase 2, i.e. valves VDEBK2 and VDABK2 are opened. The balance chamber BK2 is filled via valve VDABK2. Simultaneously the dialysate is drained from the balance chamber BK2 via valve VDEBK2. Phase 2 is completed and the menbrane is in left position (see figure).

Simultaneously the balance chamber BK1 is filled with fresh dialysate.

Therefore valve VEBK1 is opened. Valve VABK1 is also opened, to initiate the flow path for the used dialysate to the drain. The membrane moves to the right position.

The outlet fluid volume is equal to the returned fluid volume, due to the closed

balance chamber system The fluid volume removed from the closed system via the ultrafiltration pump

UFP is replaced from the blood in the dialyser and equals the precise ultrafiltration volume.

The system is initialised in preparation, i.e. the membrane sensors are automatically calibrated and the speed of the flow pumps FPE and FPA are determined. Thus a synchronisation of the membranes is guaranteed, and the pump speeds for the desired flow are determined.

FPE

RVDA

Fig. : Phase 2 Balance Chamber

VDEBK1

VEBK1

VDEBK2

VEBK2

MSBK1

MSBK2

BK1

BK2

VABK1

VDABK1

VABK2

VDABK2

DDE

VLA

LA_FS

FPA

UFP

PE/RVE

RVFPA

VBP

VDA

VDE

open offen

closed geschlossen

PDA

MT-MD-DE08C M.KAY

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B. Braun Medizintechnologie GmbH

2. Technical System Description 1/2003 2 - 31

2.16.8 Ultrafiltration and Rinsing Bridge

The main flow path and bypass have the following components:

Dialyser Inlet ThrottleDDE

•

DDE

DDEDDE

Dialyser Inlet Valve VDE

•

Dialyser Outlet Valve VDA

•

Bypass Valve VBP

•

Outlet Flow Pump FPA

•

VBP

VBPVBP

VDE

VDEVDE

FPA

FPAFPA

VDA

VDAVDA

The flow path for the main flow and bypass are determined by the valves VDE,

VDA and VBP. The built up flow from the flow pump FPA is stabilised by the throttle DDE. Valves VDE and VBP are closed for sequential therapy (ultrafiltration without dialysate flu id flow). The ultrafiltrate removal is carried out by the ultrafiltration pump UFP.

Further components are:

Red sensitive blood leak detector BL

•

Pressure sensor PDA which monitors the dialysate pressure (also used to

•

calculate TMP) Air separator LA with built in level sensors LAFS and air separator valve VLA

•

Throttle RVDA functions as a resistance to stabilise the flow of FPE

•

The throttle RVFPE prevents a high pressure build-up and thus a bursting of

tubing if the flow path is blocked behind FPE. If the set pressure is reached RVFPE is opened and the fluid can circulate.

The fluid level is lowered in the air separator LA, due to air bubbles from the dialyser (degassing or possible leakages). The air separator valve VLA is opened if the fluid level is lower than the bottom level sensor. The fluid level is increased, due to the negative pressure for the degassing range, until the level reaches the upper level sensor of the air separator LA.

2.16.9 Disinfection and Cleaning Program

The user can select a disinfection or cleaning program. The position of the couplings are checked by the sensors BICSS, KSS, SBS1 and SBS2. Then the UF pump UFP starts running and builds up a negative pressure against the closed disinfection valve VD. At approx. -200 mmHg VD opens and disinfectant is sucked in by the UFP.

The circulation va lve VZ is open and fluid fl ow s i nto the upl i ne ta nk VB, because the throttle RVDA acts as a forward resistance. Thereby a quicker heat-up in the hot cleaning program is achieved and thus a reduction of disinfectant. There is no flow of fluid to the drain during suction, heat-up and circulation.

MT-MD-DE08C M.KAY

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B. Braun Medizintechnologie GmbH

2.17 Block Diagram

2. Technical System Description 1/2003 2 - 32

Fig. : Block Diagram

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B. Braun Medizintechnologie GmbH

2.17.1 Legend Block Diagram

Supervisor Board SB

Controller Sensoren

Supervisor Sensors

BICLF BICSS

ENDLF

KSS

NSVB

PBE

PE SBS1 SBS2

TSBIC

TSD

TSE

ENDLFS

TSDS

2. Technical System Description 1/2003 2 - 33

Bicarbonate Conductivity Bicarbonate Rinsing Connection Sensor END Conductivity Concentrate Rinsing Connector Sensor Level Sensor Upline Tank Pressure Sensor Degassing Pressure Sensor Rinsing Bridge Connector Sensor 1 Rinsing Bridge Connector Sensor 2 Bicarbonate Temperature Sensor Dialysate Temperature Sensor Degassing Temperarture Sensor

END Conductivity Supervisor Dialysate Temperature Sensor Supervisor

Controller/Supervisor

Sensors/Actuators

BKUS

FEDFFS

FEDHDFS

LAFS MSBK1 MSBK2

PDA

PSABFS

PSAUS

PV RDV SAD

TSHE

VBE

VBICP

VBKS

VBKO

VDFF

VSAA

VSAE

VSB

VVB

Bottom Bicarbonate Sensor Blood Leak Detector DF Filter Detection Sensor HD Filter Detection Sensor Air Separator Level Sensors Membrane Position Sensor Balance Chamber 1 Membrane Position Sensor Balance Chamber 2 Arterial Pressure Sensor Pressure Sensor Dialysate Outlet Port Substition Drain Sensor Port Substition Outlet Sensor Venous Pressure Sensor Venous Red Detector Safety Air Detector Heater Inlet Temperature Sensor Filter Vent Valve BIC Pump Valve BIC Concentrate Suction Rod Valve Top BIC Cartridge Valve DF Filter Valve Substitution Connection Outlet Valve (drain) Substitution Connection Inlet Valve Substitution Bypass Valve Upline Tank Valve

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B. Braun Medizintechnologie GmbH

Power Board 1 PB1

Power Board 2 PB2

BPA

FPA

FPE

BICP

RVE

SAKV-SG

UFP VABK1 VABK2

VBP

VDA VDABK1 VDABK2

VDE VDEBK1 VDEBK2

VEBK1 VEBK2

VLA

VVBE

2. Technical System Description 1/2003 2 - 34

Arterial Blood Pump Degassing Pump Outlet Flow Pump Inlet Flow Pump

Bicarbonate Pump Concentrate Pump Degassing Control Valve Venous Tubing Clamp Currentles Closed Ultrafiltration Pump Outlet Valve Balance Chamber 1 Outlet Valve Balance Chamber 2 Upline Tank Bypass Valve Disinfection Valve Dialyser Outlet Valve Dialyser Outlet Valve Balance Chamber 1 Dialyser Outlet Valve Balance Chamber 2 Dialyser Inlet Valve Dialyser Inlet Valve Balance Chamber 1 Dialyser Inlet Valve Balance Chamber 2 Inlet Valve Balance Chamber 1 Inlet Valve Balance Chamber 2 Air Separator Valve Upline Tanke Inlet Valve Circulation Valve

Heparin Pump Comfort Board

SN-Crossover Board

Power Supply

BPV

PBS

PBS-S

SAKA

TSH

Heparin Pump Compact

Venous Blood Pump Pressure Single Needle Pressure Single Needle Supervisor Arterial Tubing Clamp

Heater Element Thermal Fuse Heater Element

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2.18 TFT Monitor

2.18.1 Description TFT Monitor

2. Technical System Description 1/2003 2 - 35

TFT Monitor

TFT MonitorTFT Monitor The 15" TFT monitor (TFT=thin film transistor) has a resolution of

1024 x 768 XGA. The TFT housing can be swivelled. Keyboard

Keyboard

KeyboardKeyboard The following settings can be performed via the keyboard:

Start/stop arterial blood pump BPA

•

Increase/decrease speed of arterial blood pump BPA

•

Acknowledge alarms

•

Acknowledge entries

•

Display:

Battery Option

Keys:

Decrease speed of arterial blood pump BPA

Fig. : TFT Monitor witt Touch Screen

. : Keyboard Membrane

Fig

stop

Start and stop arterial blood pump BPA

Increase speed of arterial blood pump BPA

Acknowledge alarms

Acknowledge entries

start

stop

The

key has two integrated yellow LEDs. In both the

and keys two red LEDs are in tegrated. All keys switch a resistor on the supervisor communication board to ground GNDD.

Optical Status Displays OSD

An optical status display OSD is integrated into the TFT hou sing (top left and right). The red LED is cyclically checked during therapy. The following operating statuses are displayed:

. : Rear

Fig

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TFT Monitor

Red

Red: Alarm

RedRed Yellow

Yellow: Warning

YellowYellow Green

Green: Trouble-free operation

GreenGreen

Touch Screen/Touch Controller Board TCB

The touch screen has a resolution of 4096 x 4096 with a 4-wire to technique and has an RS 232 interface (9600 Baud).

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2. Technical System Description 1/2003 2 - 36

Backlight Inverter Board BIB

Front Panel Board FPB

The backlight inverter board drives four lamps for the TFT monitor.

The front panel board has five keys. If a key is pressed a signal is generated for the TLC and LLS.

Three LEDs are integrated in each key. Thus the signals for the TLC are generated. The alarm acknowledge key additionally generates a signal for the LLS.

A charge LED is integrated on the FPB for the battery option. The volume can be set with a potentiometer. A signal is

generated for the TLC. The LLS monitors the signal via the current and the pulse.

The signals are generated for the TLC and LLS for the optical status displays OSDs.

The signals for the brightness of the LEDs (OSD) are generated for the TLC.

The signal (brightness for the TFT) for the backlight inverter board BIB is generated for the TLC.

The signal for the parallel port is generated for the TLC. The signal for the RS 232 interface is generated for the LLS.

Loudspeaker

A loudspeaker for audible alarms is either integrated in the basic housing. The volume can be set with a potentiometer on the FPB (TFT housing, rear bottom left).

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2. Technical System Description 1/2003 2 - 37

2.19 ABPM Option (None-Invasive Blood Pressure Measurement)

ABPM Option

ABPM Module/ABPM Interface Board

Dialog+

Voltage Supply

Multi I/O

2.19.1 Wiring Diagram ABPM Option

Floppy Disk Drive

Diskettenlaufwerk

A none-invasive blood pressure measurement is possible with the ABPM option (automatic blood pressure measurement). The ABPM option works on an oscillometrical basis for the automatical control of the symptomatic hypertonia during dialysis.

The ABPM option can be retrofitted in the dialysis machine. The ABPM option consists of the ABPM module and the ABPM interface board. The ABPM option will be assembled in the basic housing (left side). The ABPM module is connected to the switch mode power supply via the ABPM

interface board (connector P8). The ABPM module is connected to the motherboard (COM3 port) via the ABPM

interface board.

ABPM Module

ABPM-Modul

left side basic housing

linke Seite Grundgehäuse

Motherboard

GX1LCD

COM3

COM4

COM1COM2

Fig. : Wiring Diagram ABPM Option

ABPM Inte rface Bo ar d

ABPM Interface-Board

Switch Mode Power Supply SMPS

Schaltnetzteil SMPS

1 1

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2. Technical System Description 1/2003 2 - 38

2.20 bioLogic RR Option (Automatic Blood Pressure Stabilisation)

The bioLogic RR option can be installed and activated subsequently. The ABPM option must be present in the Dialog+ to run the bioLogic RR option.

The software for the bioLogic RR option is installed via an installation diskette. The diskette is automatically marked (assigned to the machine) during installation and subsequently can only be used for this specific Dialog+ machine.

•

Note

NoteNote If the TLC software has to be reinstalled or the hard disk drive has to be

replaced: Activate the option bioLogic RR, i.e. use the bioLogic RR installation diskette

which belongs to the respective machine and activate again the option.

Installation diskette for bioLogic RR for SW ≥ 6.20

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2.21 Supervisor Board SB

2.21.1 Supervisor

2.21.1.1 Block Diagram Supervisor

2. Technical System Description 1/2003 2 - 39

Digitale

Eingänge

Digital

Inputs

Digitale Eingänge

Analoge Eingänge Digital e Ausgänge

Digitale

Ausgänge

Digital

Outputs

E PROM

Digital Inputs

Analog Inputs Digital Outputs

RAM

Daten/Adressbus

Data/Address Bus

CPU

80C535

Reset

Generator

Speicher-

Karte

Memory

Card

ACIA

Serielle Schnittstelle

Serial Interface

Serielle Schnitt stel le

Serial Interface

Datenaustausch Controller

Data Communication Controller

E PROM

Seriell

Serial

DIABUS

TLCB

LLCB

Fig. : Block Diagram Supervisor Board

2.21.1.2 Description Supervisor

The supervisor board connects the low level controller LLC with the peripheral.

Additionally the supervisor (monitoring microprocessor) is integrated on the board. The following components are assembled on the board. The sensors are directly connected:

Bicarbonate Conductivity Measurement

•

END Conductivity Measurement Controller

•

END Conductivity Measurement Supervisor

•

DegassingTemperature Measurement

•

Bicarbonate Temperature Measurement

•

Dialysate Temperature Measurement Controller

•

Dialysate Temperature Measurement Supervisor

•

Level Sensors Upline Tank

•

Reed Contacts Rinsing Bridge

•

Venous Pressure Sensor

•

Arterial Pressure Sensor

•

Level Sensors in the Air Separator

•

Red Sensors

•

Degassing Pressure Measurement

•

Blood Inlet Pressure Measurement

•

Additionally the following components are available for monitoring and control:

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Monitoring of analogue 12 V supply voltage

•

Synchronisation of actual pump values

•

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2. Technical System Description 1/2003 2 - 40

The signal processing for the low level controller and supervisor are on the

supervisor board. All sensors are connected to this board via plugs. The power board BP1 and PB2 are also connected to this board. Signals for single sensors of the processor system are also processed separately.

Microprocessor

80C535 CPU

Address Decoding Logic

Serial E

PROM

The supervisor has the following components:

80C535 CPU

•

PROM

•

Connection for:

Memory Card

•

Digital Inputs and Outputs

•

Analogue Inputs

•

Serial Interface

•

Communication with the Controller

•

Reset Generator

•

The supervisor CPU (central processing unit) has the following data:

8 Bit Processor

•

256 x 8 RAM (internal)

•

6 8 Bit I/O Ports

•

3 16 Bit Counter

•

1 Serial Interface with max. 9600 Baud

•

8 Bit AD Converter with 8 Multiplexer Inputs

•

The processor is equipped with a 32 kB external RAM and a 1 MB E program code is stored in the E

The serial E

PROM stores the supervisor sensor calibration data. The data is

PROM. The RAM is used to store data.

PROM. The

stored during calibration in the TSM service program and loaded before a therapy is activated.

Digital Inputs and Outputs

Analogue Inputs

Serial Interface

Communication with the Controller

Reset Generator

Additional signal memory (latches) for the in- and outputs are available, because the implemented ports of the 535 processor are limited. The outputs have open colectors. All inputs have TTL level.

The processor has an internal 8 bit AD converter. The input voltage range is 0 to 5 V. The supervisor monitors the analogue sensors conductivity, temperature and pressure, these are directly connected with the inputs.

The serial interface is used for the communication with the front panel board FPB (via the SUPBUS). The tr ansfer rate is 9600 baud. The interface works in full duplex mode with V 24 level.

An additional ACIA (asynchronous communications interface adapter) is implemented for the communication with the top level controller via the DIABUS. The ACIA works in full duplex mode with 19200 baud and 24 V level.

The communication with the controller is realised by a parallel interface. The interface has signal memory (latches).

The reset generator resets the processor after th e su pply volt age is sw itched on. Thereby the program can start at a predefind address.

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2.22 Bicarbonate Conductivity Measurement

2.22.1 Block Diagram Bicarbonate Conductivity Measurement

+5 VREF

Referenzspannung

Reference Voltage

CLK4

Takt 400 0 Hz

Cycle 4000 Hz

Geschalteter

Tiefpaß

Gleichrichter

Low-Pass

Rectifier

BIC-LF Ausgangssignal

Output Signal

Fig. : Block Diagram Bicarbonate Conductivity Measurement

2. Technical System Description 1/2003 2 - 41

BICLF-A Sendeelektrode

Transmitter Electrode

Switch

Verstärker

Amplifier

BICLF-C

Empfangselektrode

Receiver Electrode

2.22.2 Description Bicarbonate Conductivity Measurement

The conductivity of the dialysate is determined by a resistance measurement.

The measurement is performed by an alternating current with approx. 4 kHz. The calibration is accomplished by the controller. The measurement cell has two transmitter electrodes and a receiver electrode with a fixed cell constant.

A transmitter voltage for the transmitter electrode BICLF_A signal is

•

generated from the +5 VREF reference voltage by the CLK4 signal (4000 Hz). The signal runs through the fluid.

•

The received BICLF_C signal is amplified.

•

The switched rectifier converts the a.c. voltage to a d.c. voltage BIC_LF.

•

A d.c. voltage, which is proportional to the conductivity is fed to the AD

•

converter. The temperature compensation and linearisation of the conductivity is

•

performed by the controller.

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2. Technical System Description 1/2003 2 - 42

2.23 END Conductivity Measurement Controller

2.23.1 Description END Conductivity Measurement Controller

The design of the END conductivity measurement controller is identical with

the bicarbonate conductivity measurement in paragraph 2.22.

2.23.2 END Conductivity Measurement Supervisor

2.23.3 Block Diagram END Conductivity Measurement Supervisor

Taktgenerator

4000 Hz

Pulse Generator

4000 Hz

Referenzspannung

Reference

Voltage

Geschalteter

END-S-LF

Ausgangssignal

Output Signal

Fig. : Block Diagram END Conductivity Measurement Supervisor

2.23.4 Description END Conductivity Measurement Supervisor

Gleichrichter

Switch

Rectifier

ENDLF-S-A Sendeelektrode

Transmitter Electrode

Verstärker

Amplifier

ENDLF-S-C Empfangselektrode

Receiver Electrode

The END conductivity measurement of the dialysate by the supervisor is in

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principle identical with the controller. The differences are:

The independent generation of the reference voltage and the clock signal

•

Dimension of the Measurement Cell

•

The calibration is

performed

by the supervisor software.

B. Braun Medizintechnologie GmbH

2.24 Temperature Measurement

2.24.1 Block Diagram Degassing Temperature Measurement

2. Technical System Description 1/2003 2 - 43

+5 VREF

Referenzspannung

Reference Voltage

TSE, TSHE, TSBIC, TSD Ausgangssignal

Output Signal

Fig. : Block Diagram Degassing Temperature Measurement

U/I Wandler

U/I Converter

2.24.2 Design Degassing Temperature Measurement

PTC

Offset

Verstärker

Amplifier

Tiefpaß

Low-Pass

The temperature of the fluid is measured by a PTC resistor (PTC positive

temperature coefficient).

2.24.3 Description Bicarbonate Temperature Measurement

The design is identical with the degassing temperature measurement in

2.24.4 Description Dialysate Controller Temperature Measurement

The design is identical with the degassing temperature measurement in

The PTC has a constant current flow of < 0.1 mA

•

The voltage drop is measured and amplified in a differential amplifier

•

An offset voltage is added to lift the zero point. Thereby the measurement

•

range of the AD converter has an optimal working condition. The output voltage is fed to the AD converter on the supervisor board via a

•

low-pass filter.

paragraph 2.24.1.

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2. Technical System Description 1/2003 2 - 44

2.24.5 Block Diagram Dialysate Supervisor Temperature Measurement

Referenz-

Spannung

Reference

U/I Wandler

U/I Converter

Voltage

PTC

Offset

Verstärker

Amplifier

TSD-S Ausgangssignal

Output Signal

Fig. : Block Diagram Dialysate Supervisor Temperature Measurement

2.24.6 Description Dialysate Supervisor Temperature Measurement

The temperature measurement of the supervisor has an independent reference

2.25 Level Measurement

2.25.1 Block Diagram Level Measurement Upline Tank

Tiefpaß

Low-Pass

voltage source. Thus a cross-interference with the temperature sensors of the controller is excluded.

+5 V

NSVBO

NSVBU

Fig. : Block Diagram Upline Tank

2.25.2 Description Level Measurement Upline Tank

The level sensor in the upline tank has two reed contacts. The contacts are

switched by an internal magnet in a float ball. Pull-up resistors are on the input. The query is carried out by the digital inputs of the controller.

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2. Technical System Description 1/2003 2 - 45

2.26 Reed Contacts

2.26.1 Block Diagram Coupling Status

+5 V

SBS1 SBS2 KSS BICSS

Fig. : Block Diagram Query Reed Contacts

2.26.2 Description Coupling Status

Magnets are integrated in the dialysate couplings und concentrate couplings. If

the couplings are connected the reed contacts are switched. The query is performed by the digital inputs of the controller and supervisor. The inputs have pull-up resistors.

2.27 Pressure Measurement

2.27.1 Block Diagram Venous Pressure Measurement

+5 VREF

Druckaufnehmer

Fig. : Block Diagram Venous Pressure Measurement

Pressure Sensor

2.27.2 Description Venous Pressure Measurement

The pressure sensor has a resistance bridge. The resistance value changes in

+1,2 VREF

Offsetspannung

Offset Voltage

+5 V

Differenz

Verstärker

Differential

Begrenzer

Limiter

Ausgangssignal

Reference Voltage

Amplifier

accordance with the present pressure valu e. A constant +5 VREF is connect ed to the bridge.

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The measurement signal is tapped and amplified in the differential amplifier.

•

An offset voltage is added to lift the zero point. Thereby the measurement

•

range of the AD converter has an optimal working condition. The voltage is limited to +5 V by a clamp circuit on the output, in the event

•

of a fault condition. A damage of the following circuit components is thereby prevented.

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2. Technical System Description 1/2003 2 - 46

2.27.3 Block Diagram Arterial Pressure Measurement

+5 VREF

Druckaufnehmer

Fig. : Block Diagram Arterial Pressure Measurement

2.27.4 Description Arterial Pressure

2.28 Blood Inlet Pressure Measurement

2.28.1 Block Diagram Blood Inlet Pressure

Pressure Sensor

Measurement

+2,5 VREF

The design of the arterial pressure measurement is identical with the venous

Offsetspannung

Offset Voltage

+5 V

Differenz

Verstärker

Differential

Begrenzer

Limiter

Ausgangssignal

Reference Voltage

Amplifier

pressure measurement in paragraph 2.27.2, with the exception of the offset voltage.

+5 VREF

+1,8 VREF

Druckaufnehmer

Fig. : Block Diagram Blood Inlet Pressure Measurement

2.28.2 Description Blood Inlet Pressure

Pressure Sensor

Measurement

The design of the blood inlet pressure measurement is identical with the venous

Offsetspannung

+5 V

Offset Voltage

Differenz

Verstärker

Differential

Begrenzer

Limiter

Ausgangssignal

Reference Voltage

Amplifier

pressure measurement in paragraph 2.27.2, with the exception of the offset voltage.

PBE

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2. Technical System Description 1/2003 2 - 47

2.29 Level Sensors

2.29.1 Block Diagram Level Sensors Air Separator

Hochpaß

High-Pass

LAFSO-EL

Oszillator

Oscillator

Hochpaß

High-Pass

Fig. : Block Diagram Level Sensors

2.29.2 Description Level Sensors Air Separator

LAFSU-EL

Gleichrichter Tiefpaß

Rectifier Low-Pass

Gleichrichter Tiefpaß

Rectifier Low-Pass

The query of the fluid level in the air separator behind the balance chamber is accomplished by the conductivity of the dialysate.

The oscillator generates an a.c. voltage with a frequnecy of approx. 8 kHz.

•

The d.c. voltage part is removed by a high-pass.

•

The output voltage is fed to the electrode.

•

If the electrode immerses into the fluid due to an increase of the fluid level,

•

the voltage at the electrode is decreased. The voltage is rectified for evaluation and smothed by a low-pass

•

This d.c. voltage is compared with a reference voltage by a comparator.

•

Komparator

Comparator

Komparator

Comparator

LAFSO

LAFSU

2.30 Red Detector

2.30.1 Block Diagram Red Detector

CLK4

Ausgangssignal

RDV

Fig. : Block Diagram Red Detector

Output Signal

2.30.2 Description Red Detector

LED-

Ansteuerung

LED Drive

Tiefpaß

Low-Pass

The red detector works as a light barrier with a triggered 4 kHz green light.

The received signal from the photo transistor is amplified.

•

The signal is only evaluated, if the green LED is also driven.

•

External interferences are thereby prevented.

•

Verstärker

Amplifier

Grün

Green

Empfänger

Receiver

The venous red detector RDV has an additional preamplifier.

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2. Technical System Description 1/2003 2 - 48

2.31 Degassing Pressure Measurement and Dialysate Pressure Measurement

2.31.1 Block Diagram Pressure Measurement

+5 VREF

+2.5 VREF

Verstärker

Differential

Druckaufnehmer

Fig. : Block Diagram Pressure Measurement

2.31.2 Description Pressure Measurement

Pressure Sensor

The respective pressure sensor has a resistance bridge. The resistance value

Offsetspannung

Offset Voltage

+5 V

Differenz

Begrenzer

Limiter

Ausgangssignal

Reference Voltage

PE/PDA

Amplifier

changes in accordance with the pre sent pressure value. A constant + 5 VREF is connected to the bridge.

The measurement signal is tapped and amplified in the differential amplifier.

•

An offset voltage is added to lift the zero point. Thereby the measurement

•

range of the AD converter has an optimal working condition. The voltage is limited to +5 V by a clamp circuit on the output, in the event

•

of a fault condition. Thereby a damage of the following circuit components is prevented.

2.32 Monitoring Analogue 12 V Voltage Supply

2.32.1 Block Diagram Monitoring of Analogue 12 V Voltage Supply

+12 VAN

-12 VAN

Fig. : Block Diagram Analogue 12 V Voltage Supply

2.32.2 Description Monitoring Analogue 12 V Voltage Supply

The analogue +12 VAN and -12 VAN supply voltages are monitored by two

Überwachung

P12ANOK

Monitoring

M12ANOK

voltage monitoring components against deviation. The components have an internal reference voltage source. Thereby the connected voltage can be constantly monitored. The P12ANOK and M12ANOK signal are switched at the output, if the voltage is lower than 10.8 V.

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2.33 Safety Air Detector SAD and Venous Red Detector RDV

2.33.1 Block Diagram SAD/RDV

2. Technical System Description 1/2003 2 - 49

Fig.: Block Diagram Safety Air Detector SAD/RDV

2.33.2 General Information SAD

Decrementation of

Detected Air Volume

Flow Dependent

Alarm Limits

If an alarm was not previously activated, the detected and added air volume from both the LLC and LLS system is decremented with a rate of 1 µl s bubbles which may have gathered in the venous bubble catcher and are accumulated in larger time intervals, do not automatically lead to an alarm, because the detected air volume is continuously subtracted by 1 µl s

The alarm limits for the air alarm depend upon the flow through the detector:

-1

50 ..... 200 ml min

•

200 ... 400 ml min

•

400 ... 850 ml min

•

Example

ExampleExample

set blood flow =250 ml min

•

no substitution

•

Flow through the sensor = 270 ml min

−

(270 ml min

blood flow = 0.2 ml

-1

blood flow = 0.3 ml

-1

blood flow = 0.5 ml

-1

= 250 ml min-1 set blood flow + 20 ml min-1 additional flow

possible by external infusion devices, e.g. HDF

Alarm limit value = 0.3 ml air

−

-1

Thus air

-1

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2. Technical System Description 1/2003 2 - 50

-1

Event Chart

Example 200 ... 400 ml min

at t = 0 an air bubble with 0.2 ml is detected

•

after t = 3 min a second air bubble with 0.2 ml is detected

•

after time t = 4 min a third air bubble with 0.2 ml is detected

•

blood flow = 0.3 ml:

Ergebnis:

[min]

After t = 3 min a second air bubble with 0.2 ml is detected. An alarm is not activated, because the first detected air volume is decremented with a rate of 1 µl s activated, because the limit of 0.3 ml is exceeded..

2.33.3 Description Safety Air Detector SAD

Principles of Air Monitoring

The monitoring of air is performed by ultrasonic transmitting between two piezo elements. The piezo elements work as trasmitter and receiver. The transmitter piezo element transmits pulses. These pulses are transmitted through the tubing, which is filled with blood (air), to the receiver piezo element. The filled tubing is the transmitting path.

Detected Air Volume in

Software Counter

[ml]

-1 0 0,3 no 0 0 + 0,2 air 0,3 no 1 0,14 0,3 no 2 0,08 0,3 no 3 0,02 + 0,2 air 0,3 no 4 0,16 + 0,2 air 0,3 yes 6 0 after acknowledgement 0,3 no

-1

, during t = 3 min = 180 s (i.e. 0.18 ml). After t = 4 min an SAD alarm is

Alarm Limit

Value

[ml}

SAD Alarm

yes / no

SAD Function

If the tubing is filled with blood the transmitting signal is only slightly attenuated (so-called coupling resistance). If the tubing is filled with air the transmitting signal is attenuated very strongly.

The received amplitude is evaluated. Thus the condition (attenuation) of the

transmitting path can be derived.

This received amplitude is compared with an alarm threshold:

Blood in tubing (no attenuation):

Amplitude of receiver signal > alarm threshold.

•

Air in tubing (large attenuation):

Amplitude of receiver signal < alarm threshold.

•

If air is in the tubing the alarm threshold is not reached and the SAD indicates air in system.

The ultrasonic transmitting pulse is triggered cyclically. The transmitting pulse is variably attenuated, depending on the air concentration in the tubing. The received voltage amplitu de is compare d with an alarm thres hold. If t he voltage drops below the alarm threshold the SAD and SAD_S signals of the flip-flops are set.

The SAD signal is checked cyclically by the low level controller LLC and then reset by the SADRESET signal. Simultaneously the low level supervisor LLS checks cyclically the SAD_S signal and is then reset by the SADRESET_S signal.

The LLC checks cyclically the function of the SAD during operation by switching from the alarm threshold to the test threshold. LLC and LLS expect an air signal after the activation of the test threshold.

An air signal is present at the flip-flop SAD_S, due to the cyclic test, until the SADRESET_S sig nal resets the ai r signal. The LLS monitors cyclically if at least air was detected once in 1.5 s. If air was not detected an SAD alarm is activated.

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SAD Calibration

Control Logic

Divider and Oscillator 3.6864 MHz

Transmitter

Receiver

Programming of Shift Registers 1 and 2

The test threshold and alarm threshold for the SAD are calibrated in the TSM service program. In dialysis the test threshold is cyclically checked to guarantee that the sensitivity of the SAD has not been reduced compared to calibration. Thus a reduction of sensitivity is detected caused by operation and ageing. The alarm threshold is cyclically measured (250 ms) by the LLS during therapy and compared with the fixed alarm threshold. The calibration threshold is the maximum sensitivity which can be reached. An individual calibration value is set in the TSM service program for the calibration ex works.

In the control logic the signals are linked for programming the shift register and to generate the process control for the SAD. Additionally the transmitter pulses are triggered and the receiver window is closed or opened.

A quartz oscillator with a divider generates the necessary clock signals. The tramsmitter piezo element oscillates via an induction voltage (piezo effect)

and transmits ultrasonic waves. The transmitted pulses from the transmitter are converted into a voltage in th e

receiver piezo element (piezo effect). The receiver voltage is fed to the comparator input.

The shift registers are selected by the SADSEL signal to enable data loading. The USDI signal is loaded into the shift register by the clock pulse signal USCLK. The outputs of the shift registers are fed to the low-passes.

Shift Register 1 and Low-Pass 1

(Alarm Threshold)

Shift Register 2 and Low-Pass 2

(Test Threshold)

Comparator

SAD Signal for LLC

SAD_S Signal for LLS

The output of the shift register 1 controls the control input of the multiplexer. A pulse width modulated voltage PWM is present at the output of the shift register 1. The low-pass 1 smooths the voltage which is fed to the multiplexer. This voltage is the alarm threshold for the comparator.

The output of the shift register 2 controls the control input of the multiplexer. A pulse width modulated voltage PWM is present at the output of the shift register 2. The low-pass 2 smooths the voltage which is fed to the multiplexer. This voltage is fed to the comparator, during the cyclic SAD test.

The comparator compares the receiver voltage with the alarm threshold. The receiver voltage is smaller than the alarm threshold if the transmitter signal is attenuated, due to air in the tubing. Together with the function of the receiver window the output signal of the comparator (to the flip-flop) becomes logic 1.

The receiver signal is larger than the alarm threshold if blood is in the tubing. The output signal of the comparator (to the flip-flop) becomes logic 0.

The SD signal is fed to the flip-flop and sent to the LLC as SAD signal. The SAD signal is checked cyclically by the LLC. The LLC resets the flip-flop via the SADRESET signal. If air is detected at any time during a cycle the SAD out put changes to logic 0. Thereby the LLC evaluates the complete last cycle as air.

The SD signal is fed to the flip-flop and sent to the LLS as SAD_S signal. The SAD_S signal is checked cyclically by the LLS. The LLS resets the flip-flop via the SADRESET_S signal. If air is detected at any time during a cycle the SAD_S output change s to logic 0. Th ereby the LL S evluates the com plete last cycle as air.

Test SAD and SAD_S

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The voltage of the low-pass 2 is switched cyclically to the comparator outpu t by the USTEST signal. Thus the comparator, the coupling and the dynamic of the circuit is checked. The alarm threshold and the test threshold (voltage of low-pass 2) is switched by the multiplexer.

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2. Technical System Description 1/2003 2 - 52

SADREF Signal

TIMECONTR Signal

2.33.4 Description Venous Red Detector RDV

Assignment and Function Red Detector

The amplifier is a differential amplifier with follow-up impedance. The difference between the voltage at the comparator input and the voltage at the voltage divider is amplified. LLS ckecks cycliccally (250 ms) the alarm threshold with the calibrated alarm threshold during therapy. If the value is out of limits a reference alarm is activated.

The quartz oscillator monitors the SAD sampling frequency. If the control logic and quartz oscillator work correctly the divider is reset by the SADX signal.

The counter output becomes logic 1 if the SADX signal is n ot present or the

time between two reset pulses is too long. Thereby a drop below the SAD sampling frequency is reported to the LLS. The TIMECONTR signal becomes logic 1 and inhibits the CLK input of the counter. Thereby an overflow of the counter and a removal of the TIMECONTR alarm is prevented.

Furthermore the SADRESET signal of the LLC is monitored. If the SADRESET

signal becomes logic 0, due to an error, the SADX signal cannot reset the counter. This leads to a TIMECONTR alarm.

The venous red detector RDV detects blood with a certain concentration. The RDV assists the user during the connection of the venous line to the patient and after therapy during disconnection with sodium chloride bags. The amplified RDV signal is processed on the supervisor board and sent to the TLC via the DIABUS.

Principle of Venous Red Detector RDV

RDV Signal

The RDV consists of a transmitter (green LED) and a r ec eiver (phototransistor). A tubing is between transmitter and receiver. Blood, colourless turbid fluid or air can be in the tubing. The RDV generates a signal to detect red fluid or colourless fluid.

The function principle of the RDV is based on the fact that blood absorbes all colours with the exception of red. The green light is attenuated if blood enters the RDV. Blood or colourless fluid can be distinguished with the phototransistor and the comparator.

The receiver signal of the phototransistor is amplified. The RDV signal is fed to the supervisor board SB for further signal processing. The signal is fed to the low level controller LLC which provides the signal to the top level controller TLC.

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2.34 Blood Leak Detector

2.34.1 Block Diagram Blood Leak Detector

Auswahl rote oder grüne LED

BLRG

Selection red or green LED

Pulsweitensignal

BLPWM

Pulse-Width Signal

2. Technical System Description 1/2003 2 - 53

LED-

Ansteuerung

LED Drive

Rot

Red

Grün

Green

BLREC

Fig. : Block Diagram Blood Leak Detector

2.34.2 Description Blood Leak Detector

Output Signal

The drive and evaluation circuit is mounted on the sensor head. The amplified

Drive Principle

Calibration

Ausgangssignal

Tiefpaß

Low-Pass

signal of the receiver is fed to the supervisor board. The blood leak detector works with red and green light. The transmitter LEDs are mounted opposite to the receiver diodes (transmitted light). The drive and evaluation is carried out by the controller. The actual value is also fed to the supervisor.

The drive of the LEDs is performed alternately by the BLPWM signal. The red LED is used to level any turbidity.

For calibration the red and green LED are driven by the BLRG signal, until both have identical output voltage. If a turbidity occurs, both drive signals are increased. If the dialysate is stained by blood only the green LED signal is attenuated. The output signal is reduced and blood is thereby detected.

Verstärker

Amplifier

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2. Technical System Description 1/2003 2 - 54

2.35 Controller Board CB

2.35.1 Block Diagram Controller Board

RTCEEPROM

MFP

Busabschluß

Bus Termination

Busabschluß

Bus Termination

+5 VG

REM

16 Analoge Leitun gen (P1)

MUXA/D

16 Analog Lines (P1)

8 Leitungen ( P3 )

8 Lines (P3)

Signal Plug P1 / P2 / P3

/ 2

CPUCLK

50 MHz

CPUCLK

Steuerlogik

Control

Logic

Steuer s ignale

Control Signals

Puffer

Buffer

SCC

16 Bit Data Bus

RAM

CIO

20 Leitungen/Baustein (P2)

20 Lines/Component (P2)

Flash

Signalstecker P1 / P2 / P3

CPU

Puffer

Erweiterungsstecker P4

Fig. : Block Diagram Controller Board CB

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Extension Plug P4

24 Bit Addres s Bus

Buffer

32 Bit Data Bus

512 K

521 K

Busabschluß

Bus Termination

Busabschluß

Bus Termination

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2.35.2 Description Controller Board

2. Technical System Description 1/2003 2 - 55

Microprocessor

CPU

The low level controller board has the following components:

CPU

•

Clock Generator

•

Control Logic

•

Memory (RAM/Flash EPROM)

•

Counter/Timer and Parallel I/O Ports CIO

•

Serial Communication SCC

•

AD Converter AD

•

Multiplexer MUX

•

System Clock Generation MFP

•

PROM

•

Real Time Clock RTC

•

Extension Connection, i.e. for Second Microprocessor

•

ADAD

MUX

MUXMUX

RTC

RTCRTC

SCC

SCCSCC

MFP

MFPMFP

CIO

CIOCIO

The 68020 CPU (central processing unit) has the following data:

32 Bit Processor

•

16 MB Address Range

•

Clock Generation

Control Logic

Memory (RAM/Flash EPROM)

Counter/Timer and Parallel I/O

Ports (CIO)

32 Bit Data Bus (external)

•

24 Bit Address Bus

•

The 32 bit data bus is connected unbuffered to all memories and is shielded against the remaining peripheral by drive components. The data bus is terminated by special terminator components. Thereby the signals are terminated and in case of a tristate condition the last level is held.

The 24 bit address bus is buffered by drive components and is terminated by diodes, to prevent reflections. All control and clock lines that are connected to several consumers are terminated by RC elements.

The clock generation for the microprocessor and control logic is generated from a 50 MHz oscillator. A D flip-flop generates two opposite phase clock signals of 25 MHz. Thereby the necessary phase accuracy and rise times for the microprocessor is achieved. For peripheral components a 4 MHz and a 2 MHz are generated by a second 8 MHz oscillator. All clock lines are terminated.

The control logic is responsible for decoding and access control. All signals required for decoding are unbuffered and come direct ly from t he CPU and from an other microprocesso r. The access cont rol implements wait cycles de pending on the addressed component.

The memory has four flash EPROMs and four static RAMs. The memories are connected parallel to the data bus. Both memory work with a 32 bit data bus.

Eight parallel ports are available as CIO components (counter/timer/parallel inputs and outputs). The CIO components have the following parts:

Serial Communication (SCC)

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two 8 Bit Ports

•

one 4 Bit Port

•

three 16 Bit Timers

•

The ports can be operated in different modes. A SCC component (serial communication controller) is available for serial

communication. The two channel controller can handle asynchronous and synchronous protocols.

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2. Technical System Description 1/2003 2 - 56

AD Converter AD

Multiplexer MUX

System Clock Pulse Generator MFP

PROM

Real Time Clock RTC

The analogue signals in the range of 0 to 5 V are converted by a 2 MHz triggered AD converter. A 16 channel multiplexer MUX is connected prior to the AD converter. All 12 bits are transmitted simultaneously to the DIABUS by a read command.

The inputs of the multiplexer are connected to the signal plug P2. The input voltage range is 0 to 5 V. The inputs are protected against over voltages of ±20 V.

A multi function peripheral component MFP is available for the internal system clock generation. The MFP has the following parts:

three 8 bit timers

•

one serial channel

•

eight in/out ports

•

A timer is pulsed with 3.68 MHz for the baud rate of the serial channels. Two timers are in series with the time basis of the software operating system. The serial interface is reserved for debugging information. The real time clock RTC

and the serial E

Specific parameters of the boards are stored in the serial E

PROM are connected to the port pins.

PROM.

The alarm output of the real time clock RTC is directly connected to plug P3. The mains power supply can thereby be switched on automatically. The voltage supply is buffered by +5 VG in the mains power supply.

Extension Port

The available extension port is related to the signals parallel to the microprocessor. A second microprocessor could have access to the board via this port.

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2.36 Power Board 1 PB1

2.36.1 Block Diagram Power Board 1

EC-Motor Ansteuerung

EC Motor Drive

Sollwert

Set Value

Stop

UND-Glied

AND Element

UND-Glied

AND Element

UND-Glied

AND Element

Tiefpaß

Low-Pass

2. Technical System Description 1/2003 2 - 57

Motor-

Regler

Motor

Controller

Komparator

Comparator

Treiber

Drive

Meßwiderstand

Measurement Resistor

EC-Motor

EC Motor

PGND

Istwert

Actual

NICHT-Glied

NOT Element

Value

nur BPA

BPADS

only BPA

NICHT-Glied

NOT Element

BPAIMP

Fig. : Block Diagram Power Board 1

2.36.2 Description Power Board 1

Drive Circuit for Pumps

Tiefpaß

Low-Pass

NICHT-Glied

NOT Element

Komparator

Comparator

Motor-

Adapter

Motor

Adapter

Hallsensoren

Hall Sensors

PumpenklappenSchalter

Pump Cover Switch

GabellichtSchranke

Light Barrier

The following drive circuits for the d.c. motors are on power board 1:

Arterial Blood Pump BPA

•

Degassing Pump EP

•

Outlet Flow Pump FPA

•

Inlet Flow Pump FPE

•

EPEP

FPE

FPEFPE

FPA

FPAFPA

BPA

BPABPA

The drives are controlled by the controller board via the supervisor board. The output signals are evaluated by the supervisor and controller board.

EC Motor with Hall Sensors

Asynchronous Actual Speed BPAIST_US

Signal of Arterial Blood Pump

Stop BPASTOP Signal of

Arterial Blood Pump

Cover Switch BPADS Signal of

Arterial Blood Pump

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The electronic commutator d.c . mo to r ha s thr ee hall sensors. The position of the magnetic rotors are detected with the hall sensors. The three phase motionless coils are fed with current according to the position of the rotors. The motor adapter detects the revolution. The speed dependent output signal is pulse width modulated. The sensitive degree and frequency are speed proportional. The signal is fed to the motor controller via a passive and active low-pass filter.

The BPAIST_US signal is generated by a NOT element from the speed dependent output signal of the motor adapter.

The EC motor can be stopped by the BPASTOP signal or by opening the pump cover. If the BPASTOP signal has logic 1, the EC motor is stopped.

A permanent magnet is integrated in the pump cover. If the pump cover is closed a reed contact is closed. This signal is linked with the BPASTOP signal after a comparator and fed to the moto r con t roller. If t h e pu m p cover is opened the motor is switched off.

B. Braun Medizintechnologie GmbH

2. Technical System Description 1/2003 2 - 58

BPAIMP Signal of Arterial Blood Pump

BPA Signal of Arterial Blood Pump

Current Limitation of EC Motor

Signals

The supervisor monitors the rotation of the arterial blood pump BPA via a slot disc. The slot disc runs in a fork light barrier. The post comparator generates the BPAIMP signal.

The set-point value for the speed of the EC motor is available as a pulse width modulated (PWM) BPA signal. The BPA signal is converted to an analogue voltage by a low-pass filter and fed to the motor.

A voltage which is proportional to a coil of the EC motor is present at a measurement resistance. A comparator com pares this voltag e with a reference voltage. The reference voltage is equivalent with the maxium motor current. The voltage of t he measurement re sistance is fed to a comp arator via a lowpass filter. The low-pass filter prior to the comparator prevents an activation of the current limitation during short period load peaks of the EC motor.

Input

Description Signal Type

Signals

BPA

Set-point value for motor speed of

PWM signal

arterial blood pump

FPE

Set-point value for motor speed of inlet

PWM signal

flow pump

FPA

Set-point value for motor speed of

PWM signal

outlet flow pump

Set-point value for motor speed of

PWM signal

degassing pump

PUMP STOP

HS1 HS2 HS3

Start/stop signal Logic 1=Stop Hall sensor signal (integrated in motor) Hall sensor signal (integrated in motor) Hall sensor signal (integrated in motor) -

Output

Description Signal Type

Signals

-IST

Proportional frequency signal for motor

speed

BPADS

Pump cover position of arterial blood

Logic 1= cover closed

pump (BPA)

BPAIMP

L1 L2 L3

Processed signal of fork light barrier Coil control Coil control Coil control -

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2.37 Power Board 2 PB2

2.37.1 Block Diagram Power Board 2

2-Wege-Ventile

2 Way Valve

Ventil

Valve

NICHT-Glied

NOT Element

NICHT-Glied

NOT Element

UND-Glied

AND Element

UND-Glied

AND Element

2. Technical System Description 1/2003 2 - 59

Strom-

begrenzung

Current

Limiter

UND-Glied

AND Element

Treiber

Drive

Ventil

Valve

RVE

VVBE

SAKV

Komparator

Comparator

Regelventil Entgasung (RVE)

Degassing Control Valve (RVE)

NICHT-Glied

NOT Element

Strom-

begrenzung

Current

Limiter

Komparator

Comparator

Ventil-Vorlaufbehälter-Eingang VVBE (2-Wege-Ventil)

Upline Tank Inlet Valve VVBE (2 Way Valve)

NICHT-Glied

NOT Element

NICHT-Glied

NOT Element

Strom-

begrenzung

Current

Limiter

UND-Glied

AND Element

Strom-

begrenzung

Current

Limiter

Komparator

Comparator

Venöse Schlauchabs perrklemme

Venous Tubing Clamp

NICHT-Glied

NOT Element

Vref

UND-Glied

AND Element

Vref

UND-Glied

AND Element

Vref

Meßwiderstand

Measurement

Resistor

Treiber

Drive

Meßwiderstand

Measurement

Resistor

Treiber

Drive

Meßwiderstand

Measurement

Resistor

Treiber

Drive

PGND

Ventil

Valve

PGND

Ventil

Valve

PGND

Ventil

Valve

SAKV_S

NICHT-Glied

NOT Element

Schrittmotor KP/BICP/UFP

Stepper Motor KP/BICP/UFP

F-schritt

Isel

Fig. : Block Diagram Power Board 2

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NICHT-Glied

NOT Element

NICHT-Glied

NOT Element

GAL

Motor-

Regler

Motor

Controller

Treiber

Drive

Motor

Meßwiderstand /

Measurement Resistor

PGND PGND

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2.37.2 Description Power Board 2

2. Technical System Description 1/2003 2 - 60

Circuit Power Board 2 Drives

Driver 2 Way Valve

Drive circuits are on the power board 2 for the following actuators:

15 2 way solenoid valves

•

one proportional control valve

•

one tubing clamp

•

three bipolar stepper motors

•

The 2 way valves are used e.g.:

To control the inlet/outlet of the balance chambers

•

To switch the dialysate flow between main and by-pass

•

The proportional valve controls the degassing pressure The stepper motors are used for:

Concentrate pump

•

Ultrafiltration pump

•

The drives are controlled by logic signals from the supervisor and controller board.

Each valve has a current limitation (mono-flop) integrated in the driver. The current limitation can be activated/deactivated by the VS signal. The valve current is determined indirectly via a voltage drop over a measurement resistor. The measurement resistor is in series with the valve coils. The voltage is compared with a reference voltage at a comparator. If the valve current reaches a limit value the output signal of the comparator switches and triggers a mono-flop. The current is cut-off for a short time, thus preventing an over load of the valves.

Driver 2 Way Valve VVBE

Driver Proportional Valve

Driver Tubing Clamp

Driver Stepper Motor

The driver for the upline tank inlet valve VVBE has an additional watchdog. The watchdog is triggered by a negative edge pulse of the VS signal. If the signal is not switched the valve closes after approx. 1.5 s. Thus an over flow of the upline tank is prevented.

The proportional valve is driven by a pulse width signal. The current in the valve coil is controlled. The design of the current limitation is identical with the 2 way valve.

The SAKV and SAKVS signals for the tubing clamp are fed to switch transistors via an inverter. The switch transistors can close the clamp independently.

The drive for the stepper motor has a GAL (generic array logic) and an integrated motor controller. The GAL generates the logic signals for the m otor controller from the frequency signal of the stepper motor and the control signal of the coil current. The motor controller h as an internal phase current lim iter. The motor coil is thereby constant.

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2. Technical System Description 1/2003 2 - 61

Signals

Input

Description Signal Types

Signals

SAKV

Switch signal for tubing clamp

Logic 1=Clamp open

(controller)

SAKVS

Switch signal for tubing clamp

Logic 1=Clamp open

(supervisor)

VB1 VB2 VB3 VLA

DV1

VE1

VE2 VA1 VA2

VDE1

VDE2 VDA1 VDA2

Switch signal for 2 way valve Logic 1=Valve closed Switch signal for 2 way valve Logic 1=Valve closed Switch signal for 2 way valve Logic 1=Valve closed Switch signal for 2 way valve Logic 1=Valve closed Switch signal for 2 way valve Logic 1=Valve closed Switch signal for 2 way valve Logic 1=Valve closed Switch signal for 2 way valve Logic 1=Valve closed Switch signal for 2 way valve Logic 1=Valve closed Switch signal for 2 way valve Logic 1=Valve closed Switch signal for 2 way valve Logic 1=Valve closed Switch signal for 2 way valve Logic 1=Valve closed Switch signal for 2 way valve Logic 1=Valve closed Switch signal for 2 way valve Logic 1=Valve closed Switch signal for 2 way valve Logic 1=Valve closed Current limitation for 2 way valve Logic 1=Valve

current not limited

RVVB

RVE

Control proportional valve PWM signal Control proportional valve PWM signal

BICP

UFP

IBICP

Control Stepper motor Frequency signal Control Stepper motor Frequency signal Control Stepper motor Frequency signal Control stepper motor Logic 1=large Coil

current

IKP

Control stepper motor Logic 1=large Coil

current

IUFP

Control stepper motor Logic 1=large Coil

current

Output

Description Signal Type

Signals

ventil-IST

Actual value switch condition of 2 way

Logic 1=Valve closed

valve

schritt-

POS

-Q11

-Q12

-Q21

-Q22

ventil-

Reed contact signal on the axis of the stepper motor

Connection for stepper motor coil Connection for stepper motor coil Connection for stepper motor coil Connection for stepper motor coil Connection for valves -

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2.38 Heparin Pump Compact

2.38.1 Block Diagram Heparin Pump Compact

2. Technical System Description 1/2003 2 - 62

+24 VGB

HP HPMORI

GAL

HPISEL HPHALT DREHS FORMS

KOLBS

Fig. : Block Diagram Heparin Pump Compact

2.38.2 Description Heparin Pump Compact

Stepper Motor

Motor-

Regler

Motor

Controller

Schritt-

Motor

Stepper

Motor

HPIST HPR HPKRALO

Lichtschranke

Kolbenplatte

Light Barrier Piston Panel

The stepper motor is controlled by a mot or controller and a GAL (generic array logic). The logic signals for the motor controller are generated from:

HPKOLB

Speed Recognition

Plunger Plate, Positive Locking

Direction of rotation HPMORI signal

•

Step frequency HP signal

•

Coil current HPHALT and HPISEL signal

•

The stepper motor works in a half step mode. An internal phase curren t limiter of the motor controller is kept constant depending of the sensor resistors.

The current of the stepper motor can be set by the HPISEL and HPHALT inputs. The internal stop signal of the motor is linked with the following signals:

Positive locking signal FORMS

•

Direction of rotation signal HPR

•

Stop signal HPHALT

•

The motor control is switched off if HPHALT is active or the positive locking is opened and the direction of rotation is set to closing.

After processing the DREHS signal with a schmitt-trigger (signal of the light barrier for detection of rotation) it is fed to a GAL. The level is only transferred with a pulse from HP. Thus mechanical vibrations of the slot disc are filtered, and the output signal is HPIST.

The plunger plate signal KOLBS and the positive locking signal FORMS for the light barrier signals are processed with a schmitt-trigger and are available as output signals HPKOLB and HPKRALO.

Syringe Sizes

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Syringe sizes of 10, 20 and 30 ml can be used in the heparin pump Compact.

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2. Technical System Description 1/2003 2 - 63

Signals

Signal Description Signal Type

Set-point frequency for stepper motor Step is performed at

falling edge

HPR

HPHALT

Direction of rotation via slot disc of stepper motor Setting of the phase current for the stepper motor driver

Logic 1=Drive running Logic 1=Stop=Phase current stepper motor = 0 (INH of TCA3727)

HPIST

Signal of the light barrier at motor Updated only with

HP pulse

HPKRALO

Status of claw Logic 1=Positive

locking is open

HPKOLB

Status of plunger plate Logic 1 = Plunger

plate ist pressed

HPMORI

Direction of rotation of stepper motor Logic 1 = Drive

opening

HPISEL

Setting of the phase current for the stepper motor driver

Logic 0=100% current Logic 1=66% current

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2.39 Single Needle Cross Over

2.39.1 Block Diagram SN Cross Over

2. Technical System Description 1/2003 2 - 64

+24 VGB

BPV

BPVSTOP

BPVIST-US

BPVDS

BPVIMP

UND-Glied

AND Element

UND-Glied

AND Element

UND-Glied

AND Element

PWM

Tiefpaß

Low-Pass

+5 VREF

Motor-

Regler

Motor

Controller

Komparator mit Tiefpaß

Comparator

with Low-Pass

Tiefpaß

Low-Pass

Komparator

Comparator

Komparator

Comparator

Komparator

Comparator

Offsetspannung

Offset Voltage

Endstufe

End Stage

Meßwiderstand

Measurement Resistor

V ref

Tiefpaß (passiv)

Low-Pass (p assive)

+5 V

GNDL

PWM

NICHT-Glied

NOT Element

EC-Motor

EC Motor

Hallsensoren

Hall Sensors

Motor-

Adapter

Motor

Adapter

Pumpen-

klappenschalter

mit Reedkontakt

Pump Cover Switch with

Reed Contact

Schlitzscheibe

Slot Disk

PBS

PBS_S

+12 VAN

5 V Referenzdiode

5 V Referance Diode

Druckaufnehmer

Pressure Sensor

+5 VREF

Druckaufnehmer

Pressure Sensor

Differenz

Verstärker

Differential

Amplifier

Offsetspannung

Offset Voltage

Differenz

Verstärker

Differential

Amplifier

Impedanzwandler

Impedance Converter

+24 V

Arterielle Schlauch-

Absperrklemme

Arterial Tubing Clamp

Begrenzer

Limiter

+5 V

Begrenzer

Limiter

+5 Vref

SAKA

Fig. : Block Diagram SN Cross Over

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FET-Leistungs-

Schalter

FET Power Switch

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2.39.2 Description SN Cross Over

2. Technical System Description 1/2003 2 - 65

EC Motor with Hall Sensors

Stop BPVSTOP Signal of

Venous Blood Pump

Cover Switch BPVDS Signal of

Venous Blood Pump

BPVIMP Signal of Venous Blood Pump

BPV Signal of Venous Blood Pump

Current Limitation of EC Motor

The EC motor can be stopped by the BPVSTOP signal or by opening the pump cover. If the BPVSTOP signal has logic 1, the EC motor is stopped.

A permanent magnet is integrated in the pump cover. If the pump cover is closed a reed contact is closed. This signal is linked with the BPVSTOP signal after a comparator and fed to the moto r con t roller. If t h e pu m p cover is opened the motor is switched off.

The supervisor monitors the rotation of the venous blood pump BPV via a slot disc. The slot disc runs in a fork light barrier. The post comparator generates the BPVIMP signal.

The set-point value for the speed of the EC motor is available as a pulse width modulated (PWM) BPV signal. The BPV signal is converted to an analogue voltage by a low-pass filter and fed to the motor.

PBS and PBSS Signals of

Single Needle Pressure Sensors

SAKA Signal of Arterial Tubing Clamp

Each pressure sensor has a resistance bridge. The resistance value changes in accordance with the present pressure valu e. A constant +5 VREF is connect ed to the bridge.

The measurement signal is tapped and amplified in the differential amplifier

•

An offset voltage is added to lift the zero point. Thereby the measurement

•

range of the AD converter has an optimal working condition. The voltage is limited to +5 V by a clamp circuit on the output, in the event

•

of a fault condition. Thereby a damage of the following circuit components is prevented.

The arterial tubing clamp is activated by the SAKA signal via a FET transistor.

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2.40 Staff Call (Option)

2.40.1 Block Diagram Staff Call

2. Technical System Description 1/2003 2 - 66

PERSR PERSR-S

PERSR-HUP

Voltage

Monitoring

Spannungs-

überwachung

Fig. : Block Diagram Staff Call

1 sec

P5 BR

STAT

P6 BR

DYN

P7 BR

DYNAUS

BR: Sol de ring Br idge Lötbrücke

5 1

2.40.2 Description Staff Call

Operating Modes

Static without Off Alarm

Dynamic without Off Alarm

Dynamic with Off Alarm

The operating modes static without OFF alarm, dynamic without OFF alarm or dynamic with OFF alarm are set with soldering bridges on the staff call board. The default setting ex works is static without OFF alarm.

P5BR: P6BR: P7BR:

The relay K1 switches as long as one of the three inputs PERSR-S, PERSR-HUP or PERSR are active.

If at least one input PERSR-S, PERSR-HUP or PERSR changes from active to inactive the relay K1 is switched for 1 second. The mono-flop U1 generates a switch time of one second.

If at least one input PERSR-S, PERSR-HUP or PERSR changes from active to inactive the relay K1 is switched for 1 second or if the + 12 VD voltage drops more than 10 %. The mono-flop U1 generates a switch time of one second. The supply voltage for the staff call circuit is decoupled by the diode V1 from the +5 V voltage and buffered by a 1 F capacitor C1.

static without OFF alarm (default) dynamic without OFF alarm dynamic with OFF alarm

MT-MD-DE08C M.KAY

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B. Braun Medizintechnologie GmbH

2. Technical System Description 1/2003 2 - 67

2.40.3 Operating Modes Staff Call System

static

without OFF alar m ohne AUS-Alarm

dynamic

without OFF alar m ohne AUS-Alarm

dynamic

with OFF alarm mit AUS- Alar m

Fig. : Operating Modes Staff Call System

Alarm Operation

Betrieb

Alarm Operation

Betrieb

Alarm Operation

Betrieb

Unit ON/Gerät EIN

Alarm

1 s

1 s 1 s

Signals:

PERSR-S

PERSR

PERSR-HUP

Press the / AQ key to reset the alarm in the operating mode

static without OFF alarm

Staff call input of low level supervisor LLS Staff call input of low level controller LLC Staff call input of power supply (This line is also active if the mains power supply buzzer is switched on or if

there is no WD level change in 0.7 s.)

2.40.4 Block Diagram Alarm Monitoring

Top Level Controller

TLC

A-S APERSR-T

Low Level

Supervisor

LLS

AKAL-S

Power

Supply

AKAL

PERSRHUP

PS PR

Fig. : Block Diagram Alarm Monitoring Staff Call

2.40.5 Pin Assignment

Low Level

Controller

LLC

PERSR-S

Staff Call

Board

PERSRWD

PERSR

Legend:

LLC alarms (by data transmission)

A: A-S: AKAL: AKAL-S: PERSR-T: PERSR: PERSR-S: PERSR-HUP: WD:

LLS alarms (by data transmission) LLC audible alarm LLS audible alarm TLC staff call (by data transmission) LLC staff call (hardware) LLS staff call (hardware) Voltage supply staff call (hardware) LLS watchdog connection (hardware)

1 3

Medical Device medizin. Gerät

Top View

Draufsicht

Fig. : Pin Assignment Staff Call Connector

MT-MD-DE08C M.KAY

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green/grün

brown/braun

white/weiß

Cable Kabel

The pin assignment is shown in the figure.

Alarm Table: Connector Cable

Alarm Operation

1-3 white-brown 3-5 white-green

B. Braun Medizintechnologie GmbH

MT-MD-DE08C M.KAY

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Fig. : Block Diagram Switch Mode Power Supply SMPS

F1 T6.25A

Mains Netz

Heater Heizung

B. Braun Medizintechnologie GmbH

Fluid Warmer

PE1

PE3

T3.15A

F2 T6.25A

F5 M10A ( 230V) F20A (110V)

F6 M10A (230V) F20A (110V)

F4 T3.15A

Filter

(EMC)

Filter

(EMV)

Primary Primär

Power

Factor

Correction

PFC

Battery 24V

Akku 24V

(Option)

Secondary Sekundär

F_bat

20..30Vdc

I_bat

Forward Converter

Abwärtswandler

Logic Logik

GND

Signals Signale

+5VD

+12VD

+12VA

-12VD

-12VA

F301

- Power Board 1/2

- Hard Disk Drive

- Floppy Disk Drive

- Ext. - P14

F302

- Supervisor/Controller

F303

- Motherboard

F304

- ABPM - P7

- P8

2.41 Switch Mode Power Supply SMPS (Benning)

2.41.1 Block Diagram Switch Mode Power Supply

2. Technical System Description 1/2003 2 - 68

MT-MD-DE08C M.KAY

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Fig. : System Integration

2.41.2 System Integration

BIB

Backlight

Inverter

Board

Charge LED

Lade LED

L N PE

L N

B. Braun Medizintechnologie GmbH

Thermal Fuse Thermosicherung

180 0 W

Mains Input Netzeingan g

Heater Heizung

LC Display

TCB

Touch Controller Board

FPB

Front Panel Board

Heater / Heizung

Fl uid War mer

L N PE

Battery

Akku

LVDS

Low Voltage Differential

Signal Adapter

TLC

Fan

Lüfter

Mains Switch

Netzschalter

Battery Option

Akku-Option

2. Technical System Description 1/2003 2 - 69

Power

+5VD +12VD

-12VD +12VAN

-12VAN 24VL 24VGB 24VGD

Message Output Meldungen Ausgang

B24OK D24OK

/PERSR_N /AKKU_OK PF PGD +5VG

Top L eve l Control l er

(GX1LCD M otherboard )

max

U Control

U-Regler

SMPS

Power B oa rd

Primary/

Primär

ail

SMPS

Power Board

Secondary/

Sekundär

Power

Aux. Voltage Hilfspannung

P101

Buzzer

Summer

Logic

Logik

24V

2 x 1F

5 V

Drive for Battery, Buzzer, Clock

Ansteuerung für Akku, Summer, Uhr

24 V Control

24 V Steuerung

Heater Contr ol Input

Watchdog

Heizungssteuerung Eingang

H_DCLK

H_PROG

H_DIN

DGND

D24OFF

AKAL

/REM

AKAL_S

Machine Monitoring Input

Geräteüberwachung

/B24OFF

DGND

AKKU_EN

WD_S

MT-MD-DE08C M.KAY

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Fig. : Layout Switch Mode Power Supply SMPS

2.41.3 Layout Switch Mode Power Supply SMPS

Mains

Input

PE L N PE L1 N1

X1.3 X1.1 X1.2 X1.6 X1.5 X1.4

Heater

B. Braun Medizintechnologie GmbH

Fluid

Warmer

PE3 N3 L3

Pay Attention to Pin Assignment!

Auf Pinbelegung Achten!

F1 T6.25A 6.3x32 F2 T6.25A 6.3x32 F3 T3.15A TR5 F4 T3.15A TR5

F5/F6 - 1 1 0/120V: F20A 6.3x32

- 230V: M10A 6.3x32

F301 T3.15A TR5 F302 T5 .0A TR5 F303 T3.15 A TR5 F304 T3.15 A TR5 F401 T3.15A TR5 F402 T5 .00A TR5 F403 T1.25 A TR5 F500 T3.15A TR5 F600 M10.00A 6.3x32 F601 T3.15A TR 5 F6 02 T3.1 5 A TR 5

+12VD / F401 - T3.15A TR5 +12V +12VD / F402 - T5.00A TR5

+12VAN / F403 - T1.25A TR5

+5VD / F303 - T3.15A TR5 +5VD / F302 - T5.00A TR5 +5VD / F301 - T3.15A TR5 +5VD / F304 - T3.15A TR5

+24 VGD / F602 - T3.15A TR5

+24VGB / F601 - T3.15A TR5

+24VL

LED

F401 F402

F403

F303 F302

F301 F304

F602 F601

P12

P10

P13

Regulator Regler

+5V

-12V

Voltages PC

Voltages Power Board 1/2

Voltages Sup./Contr. Board

Battery

Mains Switch/ Fan

Voltage FDD

Signals Supervisor Board

2. Technical System Description 1/2003 2 - 70

X10 0

Fan Option

Option

ABPM

P101

Watchdog

EXT_ON

Voltages HDD

2. Technical System Description 1/2003 2 - 71

2.41.4 Wiring Diagram Switch Mode Power Supply SMPS with Battery Option

LC Display

(right)

(rechts)

PE L N PE L1 N1

X1.3 X1.1 X1.2 X1.6 X1.5 X1.4

PE3 N3 L3 N2 L2

X3X1X2

(left)

(links)

J5J3

J7 J9

Charge LED

Lade LED

LED

F401 F402 F403

F303 F302

P12

P10

Battery

F301 F304

F602 F601

2 x 12V

Switch Mode Power Supply

SMPS

Fig. : Wiring Diagram Switch Mode Power Supply SMPS with Battery Option

MT-MD-DE08C M.KAY

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X100

=blue

P13

P101

Charge LED

=brown

Pin 1/2

Lade LED

B. Braun Medizintechnologie GmbH

2. Technical System Description 1/2003 2 - 72

2.41.5 Description Switch Mode Power Supply

The switch mode power supply SMPS is assembled in the rear door. The battery option can be retrofitted in a Dialog+.

Rated Voltage: Fuses:

F1/F2 F3/F4 F5/F6

F301 F302

F303/F304

F401 F402 F403 F600

F601/F602 Filter (EMC) Power Factor Correction

PFC

110/120/230/240 V 50/60 Hz

6.25 AT (6.3x32) Mains input

3.15 AT (TR5) Fluid warmer 230/240 V: 10 AM (6.3x32)

110/120 V: F20 A (6.3x32)

Heater 1800 W/240 V Heater 1800 W/110/120 V

3.15 AT (TR5) +5 VD

5.00 AT (TR5) +5 VD

3.15 AT (TR5) +5 VD

1.25 AT (TR5) +12 VD

5.00 AT (TR5) +12 VD

1.25 AT (TR5) +12 VAN 10 AM (6,3x32) +24 VL

3.15 AT (TR5) +24 VGB The filter is required for EMC measures (EMC = electromagnetic compatibility). PFC circuits are used for switch mode power supplies and ensure that the line

current is drawn sinusoidally and in phase with the sinusoidal line voltage.

Forward Converter

2.41.6 Pin Assignment Switch Mode Power Supply

P2 – Signals to Supervisor Board

Pin Signal Description I/O Pin Signal Description I/O 1a 2a

4a 5a

6a 7a 8a

9a 10a

P3 - Battery Connection (Screw Terminal)

PF Power Fail O /REM

WD_S nc I

nc H_DIN Data for shift register I

EXT_STATE Status for external switch-on possibility O B24OK

H_DCLK Clock to load shift register I /AKKU_OK Battery status O

The forward converter (Bu ck converter also called down swit cher) converts an input voltage into a lower output voltage, i.e. the 24 V is converted into ±12 V and +5 V.

B24OFF_S Switch-off 24 V supervisor blood side I

Remote control power supply I Supervisor WATCHDOG I

Voltage monitoring blood side O

D24OFF_S Switch-off 24 V supervisor dialysate

AKAL Audible alarm I

AKAL_S Audible alarm supervisor I

+5VG Voltage supply for clock on controller

PERSR_N Signal to activate the staff call O

AKKU_EN Enable battery operation I

D24OK Voltage monitoring dialysate O

H_PROG Programming mode for shift register I

GND

10b

side

board

Pin Signal Type Description Tolerance Current [A]

+24VAKKU stabilised Charge and discharge current 21 V ... 28 V 15

GNDAKKU Ground power

MT-MD-DE08C M.KAY

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B. Braun Medizintechnologie GmbH

P4 - Voltage Supply Power Board 1/2

2. Technical System Description 1/2003 2 - 73

Pin Signal Type Description

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15

+5VD stabilised +5 V digital (PB1) GNDD Ground digital (PB1)

-12VAN stabilised -12 V analogue (PB1) +5VD stabilised +5 V digital (PB2) GNDD Ground digital (PB2) GNDL Ground power (PB1)

+12VAN stabilised +12 V analogue (PB1)

GNDL Ground power (PB1) GNDL Ground power (PB2)

+24VL rectified +24 V power (PB1) +24VGB rectified +24 V switched blood (PB1) +24VGD rectified nc (PB1); +24 V switched dialysate (PB1)

+24VL rectified +24 V power (PB2) +24VGB rectified +24 V switched blood (PB2) +24VGD rectified +24 V switched dialysate (PB2)

P5 - Voltage Supply Supervisor/Controller Board

P6 - 3½" Floppy Disk Drive

P7 - Voltage Supply Options

Pin Signal Type Description

1 2 3 4 5 6 7 8

9 10 11 12

+12VAN stabilised +12 V analogue

-12VAN stabilised -12 V analogue GNDAN Ground analogue

+12VD stabilised +12 V digital

-12VD stabilised -12 V digital GNDD Ground digital

+24VGB 20...30 V +24 V switched blood side

+24VL 20...30 V +24 V power

GNDL Ground power +5VD stabilised +5 V digital GNDD Ground digital GNDL Ground power

Pin Signal Type Description

1 2

+5VD stabilised +5 V digital GNDD Ground digital

Pin Signal Type Description

1 2 3 4 5 6 7 8 9

+5VD stabilised +5 V digital

GNDD Ground digital

+12VD stabilised +12 V digital

-12VD stabilised -12 V digital GNDD Ground digital

+12VAN stabilised +12 V analogue

-12VAN stabilised -12 V analogue GNDAN Ground analogue

P8 - Voltage Supply Option ABPM

(Automatic Blood Pressure Measurement)

MT-MD-DE08C M.KAY

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Pin Signal Type Description

1 2 3 4 5 6 7 8 9

+5VD stabilised +5 V digital

GNDD Ground digital

+12VD stabilised +12 V digital

-12VD stabilised +12 V digital GNDD Ground digital

+12VAN stabilised +12 V analogue

-12VAN stabilised -12 V analogue GNDAN Ground analogue

B. Braun Medizintechnologie GmbH

2. Technical System Description 1/2003 2 - 74

P9 - Mains Switch and Voltage Supply Fan

P10 - Voltage Supply PC

Pin Signal Description

AKKU_Laden Display "Charge Battery"

1 2 3 4 5 6 7 8

9 10 11 12

GND Digital ground Mains Switch Logic (1 Mains Switch +12 VH (1

+12VD +12 V digital (fan) +12VD +12 V digital (fan)

Mains Switch Logic (2

nc GND Digital ground (fan) GND Digital ground (fan)

Mains Switch GNDH (2

level)

Pin Signal Type Description

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15

+5VD stabilised +5 V digital

nc GNDD Ground digital +5VD stabilised +5 V digital

nc Coding GNDD Ground digital +5VD stabilised +5V digital

nc GNDD Ground digital

+12VD stabilised +12 V digital

nc GNDD Ground digital

-12VD stabilised -12 V digital

+12VD stabilised +12 V digital

GNDD Ground digital

level)

P11 - Voltage Supply Hard Disk Drive

P12 - Voltage Supply Options

P13 - Connection Monitor Booster

Pin Signal Type Description

1 2 3 4

+5VD stabilised +5 V digital

+12VD stabilised +12 V digital

GNDD Ground digital GNDD Ground digital

Pin Signal Type Description

+5VD stabilised +5 V digital

+12VD stabilised +12 V digital

GNDD Ground digital

+12VAN stabilised +12 V analogue

-12VD stabilised -12 V digital

GNDD Ground digital

-12VAN stabilised -12 V analogue

GNDAN Ground analogue

GNDD Ground digital

+24VL 20 ... 30 V +24 V power

nc Coding

GNDL Ground power

+24VGB 20 ... 30 V +24 V switched blood

+24VGD 20 ... 30 V +24 V switched dialysate

GNDL Ground power

MT-MD-DE08C M.KAY

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Pin Signal Type Description

+24 V (20 .... 28 V

1 2 3 4

GNDD Ground digital

/HSS_ON

GNDD Ground digital

B. Braun Medizintechnologie GmbH

2. Technical System Description 1/2003 2 - 75

P14 - Input Signal /EXT_ON

(Switch-on machine from external source)

Screw Terminal:

X1 - Mains Input, Heater

X3 - Fluid Warmer, Relay Monitor Booster

Pin Signal Type Description

1 2 3 4 5 6

GNDD Ground digital

/EXT_ON Open collector input

EXT_STATE Input

+5VD +5 V digital

Pin Voltage

1.1

1.2

1.3

1.4

1.5

1.6

Pin Voltage

3.1

3.2

PE3

3.3

Inputs:

Mains Switch

H_DIN

WD_S

/REM AKAL

AKAL_S

MSWITCH

B24OFF D24OFF H_DCLK

H_PROG

AKKU_EN

Rated Mains Voltage

/EXT_ON

EXT_STATE

level

2 Data for shift register and watchdog controller Watchdog supervisor Remote (clock on controller board) Audible alarm (controller) Audible alarm (supervisor) Mains switch +24 VGB ON/OFF (supervisor) +24 VGD ON/OFF (supervisor) Clock for programming shift register Programming mode shift register Enable battery operation (only possible in therapy mode ) 110/230 V 50/60 Hz The machine can be switched on with this signal (see menu 1.26 Battery

Option: external ON). Status for external switch-on possibility (e.g. central disinfection),

simultaneously input and output; the signal is looped through (connector P14/3 = input).

MT-MD-DE08C M.KAY

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B. Braun Medizintechnologie GmbH

2. Technical System Description 1/2003 2 - 76

Outputs:

B24OK

D24OK

PERSR_N

/AKKU_OK

Connections

Voltages

EXT_STATE

Mains Switch

ON/OFF

+24VGB +24VGD

OK Staff call Load status of the battery Power fail (power failure) Fluid warmer, heater

+5 VD: Digital

12 VD: Digital

12 VAN: Analog

+24 VL: Power (non-regulated) +24 VGB: Switched blood side +24 VGD: Switched dialysis side

External machine switch-on (information for TLC), simultaneously input and output; the signal is only looped through (connector P2/7a = output).

If the Dialog+ is switched off via the

Automatic Switch-Off

function in therapy the machine is in standby mode, e.g. the Dialog+ can be switched on and off via the disinfection program.

The Dialog+ is only disconnected from mains if the mains plug is pulled out of the mains socket.

Standby

H_PROG

H_DIN

H_DCLK

Watchdog

The power consumption is ≤ 10 W in standby mode. The

0 1

The

H_PROG

H_DIN

signal is an open-collector signal and is generated by the LLC. No programming mode: Data rotate in shift register Programming mode: Shift register can be written

signal is an open-collector signal and is generated by the LLC (data

for the shift register to drive the heater).

0 1

The pending data at

Half-wave of mains voltage for heater switched off Half-wave of mains voltage for heater switched on

H_DCLK

signal is an open-collector signal and is generated by the LLC. The

are shifted into the shift register with the

H_DIN

H_DCLK

signal to drive the heater. 0,

Rectangular signal to shift the data into the shift register

A watchdog is integrated to prevent a permanent unitentional drive of the heater in case of a LLC reset. The watchdog is retriggered by the LLC with < 2 s. The

signal is used for triggering. After switching on the switch mode

H_DIN

power supply the watchdog prevents a drive of the heater for t = 10 s. The watchdog has no safety function and is therefore not tested before the

therapy starts.

MT-MD-DE08C M.KAY

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B. Braun Medizintechnologie GmbH

2.42 Safety Concept

2.42.1 Block Diagram Safety Concept

2. Technical System Description 1/2003 2 - 77

Controller-Kanal

Controller Channel

Touch

Screen

Controller-Fenster

Controller Window

Touch Controller

Board TCB

Video Con t rol le r RAM

LC Display

Low Voltage Differential

Signal Adapter LVDS

Front P anel Board FPB

Supervisor/Controller Tasten

Supervisor/Controller Keys

AQ EQ

Supervisor-Kanal

Supervisor Channel

Supervisor-Fenster

Supervisor Window

stop

Diskettenlaufwerk

Floppy Disk Drive

Festplatte

Hard Disk Drive

Controller-Fenster

Supervisor Window

UI-SW

Top Level Controller

TLC

DIABUS

Low-Level-Controller

Low Level Controller

LLC LLS

SW-SC

BUS

SUPBUS

Low-Level-Supervisor

Low Level Superv isor

Sensoren

Sensors

Fig. : Hardware Safety Concept

MT-MD-DE08C M.KAY

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Motoren

Motors

Ventile

Valves

Sensoren

Sensors

Sensoren Sicherheitsrelais

Sensors Safety Relay

24 V Versorgungsspannung

B. Braun Medizintechnologie GmbH

24 V Supply Voltage

2.42.2 Description Safety Concept

2. Technical System Description 1/2003 2 - 78

The complete control and monitoring of the system is performed by the

controller. The supervisor is an independent protection system and controls the safety relevant process parameters.

The double channel design of the hard- and software guarantees the monitoring of the safety relevant input and output values. The input of the setpoint value, the fault free transmission and monitoring of the output values are thereby guaranteed.

The safety concept has the following processor systems:

Top Level Controller

Low Level Controller

Top level controller on the top level controller board TLC

•

Low level controller on the low level controller board LLC

•

Supervisor on the supervisor board LLS

•

LLS

LLSLLS

The top level controller TLC consists of:

PC hardware

•

Operating system (QNX, multi-tasking real time operating system)

•

The top level controller TLC has the following functions:

Communication with the user

•

Processing of the process parameters for the LLC

•

Control of the ABPM

•

Balance of ultrafiltration/substitution

•

The input of the set-point values is performed by:

Touch screen (colour TFT)

•

Floppy disk drive

•

LAN (local area network)

•

The low level controller LLC has:

TLC

TLCTLC

LLC

LLCLLC

Software Supervisor

Communication Module SW-SC

Front Panel Board FPB

Supervisor

Enter of Set-point Values

68020 microprocessor system

•

The low level controller LLC has the following functions:

Control of motors and valves

•

Monitoring

•

The software supervisor communication module (SW-SC module) is a safety independent software module within the TLC. The SW-SC module logically belongs to the supervisor. It has the following functions:

Display of safety relevant data from the supervisor on the TFT

•

The front panel board FPB has the following functions:

Interaction with the user via front panel keys and LEDs

•

Drive of loudspeaker

•

The supervisor consist of:

80535 microprocessor system

•

The supervisor has the following functions:

Signal processing of the sensors

•

Monitoring of the safety relevant process pararmeters

•

The acquisition of the set-point values (therapy parameters) is performed as follows:

MT-MD-DE08C M.KAY

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Set-point values can be entered by the TLC for preparation of a therapy. The

•

data is transmitted to the LLC and supervisor via the DIABUS.

B. Braun Medizintechnologie GmbH

2. Technical System Description 1/2003 2 - 79

The data is used by the LLC to control the motors and valves. The ala r m limit

•

values are simultaneously generated for the monitoring of the process parameters.

Alarm limit values are generated from the set-point values by the

•

supervisor. These are transmitted to the SW-SC module via the DIABUS. The following set-point values are displayed on the screen before a therapy

•

can be activated: Controller Window:

Controller Window:

Controller Window:Controller Window:

Safety relevant variable set-point values of the controller

−

The controller window data is prepared in the video RAM of the TLC by

−

the user interface software UI-SW module (UI-SW module) of the TLC.

Supervisor Window:

Supervisor Window:Supervisor Window:

Set-point values of supervisor

−

The supervisor window data is mixed with the controller window data in

−

the video RAM of the TLC by the SW-SC module.

The user is requested to check these data for plausibility. The double

•

channel point values of the supervisor for monitoring are enabled by the

acknowledgement of the

key (enter acknowledgement) can be pressed. The therapy set-

key.

Safety relevant set-point values can only be changed during a therapy after

•

the user has compared and then acknowledged these values ( then the data is enabled and used by the controller and supervisor.

key). Only

MT-MD-DE08C M.KAY

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B. Braun Medizintechnologie GmbH

B.Braun Dialog+ Service manual 2

Specifications and Main Features

Frequently Asked Questions

User Manual