F. Stephan Alia Service Manual

Alia

Ventilator

PEEP

10300

Steriles aq ua dest.

Alia

INSPIRATIONS-DRU CKEXPIRATIONS-DRUCK

PLATEAU

mbar

max.

AIR

Med.

AIR

Service Instructions

Preface

Service instructions

Note

These service instructions aim to provide assistance for troubleshooting activities with the A

LIA ventilator.

It contains drawings, circuit diagrams and parts lists for a better understanding of how the ventilator works.

Service and maintenance work can be carried out to the peripheral components of the A the ventilator can only be carried out by F. S service partners. Otherwise the entire electronic systems in the A

LIA ventilator. Repairs to the electronic control of

TEPHAN GMBH or authorized

LIA

ventilator require no maintenance. Every step of a specific procedure should be read through carefully

before starting to service the unit. Always only use the correct tools and the stated measuring equipment. Failure to follow the instructions and/or recommendations in these service instructions can result in the device not working properly or cause damage to the device.

Only use original spare parts by F. S spare parts list (see chapter

10 p. 75).

TEPHAN GMBH as contained in the

These service instructions do not replace the operating instructions. Handling the device in any way presumes an exact knowledge and compliance with the operating instructions. The device is only intended for the described purpose.

F. Stephan GmbH

- Medizintechnik Kirchstrasse 19

56412 Gackenbach

Subject to technical alterations.

as of: Januar 2006 version: V1.0

2 SA-112-0106V1.0-WEM-GB © F. Stephan GmbH

Contents .....................................................................................................3

1 General information........................................................................... 5

1.1 Device name and manufacturer...............................................5

1.2 Maintenance and repairs..........................................................5

1.3 Abbreviations and definitions..................................................6

1.4 Safety instructions ...................................................................7

2 Mechanical structure..........................................................................9

3 Components and functions...............................................................15

3.1 Electronic controls.................................................................16

3.1.1 Sensor board..............................................................16

3.1.2 Controller board ........................................................20

Contents

3.1.3 Power Distribution Unit PDU ...................................22

3.2 Power supply .........................................................................25

3.2.1 Power supply unit......................................................26

3.2.2 Rechargeable battery.................................................27

3.2.3 Inverter ......................................................................28

3.3 Gas supply .............................................................................29

3.3.1 Oxygen supply...........................................................30

3.3.2 Compressed air supply ..............................................31

3.4 Fresh gas reservoir.................................................................32

3.5 Patient part.............................................................................36

3.5.1 PEEP valve................................................................37

3.5.2 Plateau valve .............................................................38

3.5.3 Breathing gas humidifier...........................................38

3.6 Patient tube system................................................................40

3.6.1 Patient tube system for adults....................................40

3.6.2 Patient tube system for children ................................42

3.6.3 Temperature sensor for patient tube system..............43

3.6.4 Pneumotachograph type D ........................................44

3.6.5 Pneumotachograph Typ C.........................................44

4 Serial interface.................................................................................45

4.1 Commands.............................................................................46

Contents

4.2 Setting and querying the date and time..................................47

4.3 Output of measured values ....................................................48

5 Tools and aids..................................................................................51

6 Checks and maintenance..................................................................53

6.1 Every time before starting the device....................................53

6.2 Weekly...................................................................................54

6.3 ½ yearly.................................................................................55

6.3.1 ½ yearly maintenance basic unit ...............................55

6.3.2 Maintenance of the patient part.................................59

6.4 Safety checks.........................................................................60

6.4.1 Test report .................................................................61

7 Troubleshooting...............................................................................69

8 Annex...............................................................................................71

9 List of illustrations...........................................................................73

10 List of tables.....................................................................................75

11 Place for your Notes.........................................................................77

4 SA-112-0106V1.0-WEM-GB © F. Stephan GmbH

1 General information

1.1 Device name and manufacturer

LIA

Device name

Manufacturer

F. S

TEPHAN GMBH

- M

EDIZINTECHNIK -

IRCHSTRASSE 19

K 56412 G

 (+)49 (6439) 9125 – 0  (+)49 (6439) 9125 – 111  info@stephan-gmbh.com  www.stephan-gmbh.com

ACKENBACH

1 General information

1.2 Maintenance and repairs

In the interests of device safety, maintenance of the A should be carried out every six months.

Safety checks must be carried out every six months. Maintenance must be carried out by the authorized customer service of F.

STEPHAN GMBH. Only spare parts from F. STEPHAN GMBH must be used during

maintenance.

Clean and disinfect the device respectively device parts every time before maintenance, even when returning the device for repairs.

Caution!

LIA ventilator

1 General information

1.3 Abbreviations and definitions

Abbreviation Definition Meaning

%h Percentage hours Service life of the oxygen sensor in

hours depending on the oxygen

concentration AIR Medical compressed air aqua dest. Aqua destilata (lat.) Distilled, demineralized water bar Unit of measurement for compressed

air Batt Rechargeable battery Device for storing electrical energy in

the form of chemical energy cmH2O Unit of measurement for compressed

air = mbar FiO2 Inspired oxygen concentration IGR Incremental transducer Push button and knob PDU Power distribution unit Power Distribution Unit PEEP Positive end expiratory

pressure

V Volt Unit of measurement for electrical

Table 1: Abbreviations and definitions

voltage

6 SA-112-0106V1.0-WEM-GB © F. Stephan GmbH

1.4 Safety instructions

Refers to instructions drawing attention to important facts.

The following safety instructions appear at relevant points in the service instructions and must always be heeded.

Refers to warnings which, if not heeded, can result in malfunctions, damage or defects in the device, which can possibly also put the patient at danger.

Warning

1 General information

Caution

Refers to precautions which, if not heeded, can result in damage to the device and its accessories.

2 Mechanical structure

LIA ventilator consists of a basic housing and a front housing. The

The A front housing also acts as the device cover.

Fig. 1: Basic and front housing: general

2 Mechanical structure

Front housing

Warning

Remove the front housing to open the A

LIA ventilator.

Risk of an electric shock Disconnect from the power source before opening the housing!

The front housing is screwed to the frame with 15 countersunk screws M4x10. The 9 screws used on the side of the device are also fitted with rosettes to prevent damage to the plastic front housing when tightening the screws.

Fig. 1: Opening the housing

The front housing can now be hinged open to the front.

2 Mechanical structure

Fig. 2: Hinging open the housing

Before hinging open the front housing, ensure that the connectors for the tube heating, the temperature sensors and the pneumotachograph have been disconnected.

The plastic front housing is coated with an EMC varnish on the inside. It contains the input periphery of the A

LIA ventilator.

This input periphery consists of touch buttons, the IGR (push/turn knob), the LCD display, the controller board, the double flowmeter ON/OFF switch on the front pane.

Fig. 3: Front housing with input periphery

1 double flow meter 2 FiO

and flow adjustment

10 SA-112-0106V1.0-WEM-GB © F. Stephan GmbH

Basic housing

2 Mechanical structure

The frame of the A

LIA ventilator and its reinforcement bar, fastening

bracket and panels consist of 2 mm thick powder-coated aluminium. The bottom of the housing has a cut-out for the rechargeable battery.

Service flap

Fig. 4: Basic housing

1 Reinforcement bar 2 Cut-out for rechargeable battery 3 Rechargeable battery

The intake filter and oxygen sensor are located behind a service flap on the back of the ventilator.

To open the service flap, loosen the knurled screws by turning counterclockwise.

The oxygen sensor is located on the left next to the intake filter. It is screwed into the connection block.

It can be removed by turning counter-clockwise. The electrical connection between the oxygen sensor and device consists

of a 2-pin AMP connector.

2 Mechanical structure

Fig. 5: Service flap

1 Intake filter 3 Oxygen sensor 2 Service flap

On the left and right side wall there are recessed handles for carrying the

LIA ventilator.

Some of the electronic controls and the power supply are accommodated inside the ventilator.

Fig. 6: Electronic components

1 Power supply 3 Electronic controls 2 Cold device connector combination

12 SA-112-0106V1.0-WEM-GB © F. Stephan GmbH

2 Mechanical structure

The entire pneumatic system is accommodated in the basic housing. Only the double flowmeter is in the front housing.

The pneumatic system consists of the compressor, the fresh gas reservoir and its control valves. The pressure switches for detecting the intake pressure are firmly integrated in the pneumatic system

Fig. 7: pneumatic components

1 compressor 2 fresh gas reservoir 3 gas inlets 4 service flap

The patient part is connected to the basic device from the front. The patient part is held in position by the guide rail.

2 Mechanical structure

Fig. 8: Inserting the patient part

14 SA-112-0106V1.0-WEM-GB © F. Stephan GmbH

3 Components and functions

LIA ventilator consists primarily of the following parts:

The A



Electronic controls

 Power supply  Gas supply  Fresh gas reservoir  Patient part  Patient tube system

Fig. 9: A

LIA block diagram

3 Components and functions

3.1 Electronic controls

LIA ventilator uses an 8-bit micro controller. This controls the

The A sensors and actuators in the system.

In addition to these components, the unit also has electronic components which provide the electrical power supply.

These consist of a power supply unit and a device for bridging any power failure. In the event of a power failure, the device switches over to battery operation and regulates the battery charging process.

The sensor board generates voltages of ±15V and -5V, and the controller board generates + 5V.

3.1.1 Sensor board

The sensor board acts as interface for triggering the actuators (control of the fresh gas reservoir and the expiration valve) and for registering the measured data (pressure and differential pressure sensors, AD converter).

An SPI bus system provides the link to the micro controller. This simplifies linking the various components in terms of both hardware and software.

The following illustration shows the components on the sensor board.

Abb. 2: Sensor board

16 SA-112-0106V1.0-WEM-GB © F. Stephan GmbH

Main tas

Voltage signals (input):

Voltage signals

(output):

3 Components and functions

The main task of the sensor board is to convert the analog signals.

Rechargeable battery voltage "DC_good"

signal

On/off signal Input voltage 12 V (for heating and valves) Inspired pressure Expired pressure Flow sensor differential pressure Oxygen sensor cell voltage

Heating Valves "Batt_enable"

Pressure sensors

The power supply for the electronic components is generated by a DC/DC converter on the sensor board, generating +15V, -5V and -15V.

The input signals for On/Off, DC_good, input voltage and "Batt_enable" are sent to the SPI bus by a slide register. The input signals for pressure, flow, O

and battery voltage are sent to the SPI bus following

amplification and conversion via an 8-channel AD/12 bit converter. The AD converter is equipped with protective diodes (max. 5V) on the

input side. A serial chargeable slide register with power amplifier is used for

triggering the heating and the valves, via the SPI bus.

The respiratory pressure is measured at the inspiration fitting of the patient part. The pressure present here is conveyed via a tube to the pressure sensors (respiratory pressure).

For safety reasons, two pressure sensors are provided for measuring the respiratory pressure.

The differential pressure developing over the resistance body of the PNT head is used for measurement of the volume flow. This differential pressure is conveyed via two tubes to the differential pressure sensor.

3 Components and functions

Calibration bloc

4 5

Fig. 10: PNT and pressure fitting

1 hose heating socket 2 temperature sensor socket

4 electrical connection magnetic

coil

3 pneumotachograph connector 5 pressure fittings 6 water bath connectors

The calibration block allows for offset calibration of the differential pressure sensor and the oxygen sensor.

The interposed solenoids V4 and V5 switch the measuring lines of the differential pressure sensor against the atmosphere. The valves are switched at exactly the same time. The value measured in this way corresponds to a flow of 0 l/min.

FiO

FiO2 measurement

measurement is carried out using an electrochemical cell (fuel cell).

This oxygen sensor generates a voltage depending on the prevailing oxygen concentration. The voltage is then converted electronically into a corresponding signal.

To calibrate the oxygen sensor, compressed air ( 21% O

) is blown

against it via solenoid V6. During this procedure, the display shows "CAL" in the window of the FiO

value. After completing calibration, the

valve switches the oxygen sensor back to the output of the double flowmeter.

Fig. 11: Display showing 'CAL'

3 Components and functions

Fig. 12: Pneumatic function diagram

3 Components and functions

3.1.2 Controller board

Fig. 13: Controller board

1 PDU board 2 controller board

Various functional groups are accommodated on the controller board. The figure shows the functional groups for the user interface, CPU and

interfaces. The user interface consists of the keyboard, display (LCD) and LEDs as

input and output units for regular handling of the system. The controller board also contains the alarm system for indicating alarm statuses.

The digital interfaces for triggering the actuators and reading the sensors (via the sensor board) are integrated on the controller board.

Fig. 14: Controller board

3 Components and functions

Main tas

The main task of the controller board is to proceed with ventilation. The procedure consists of registering the measured values of the sensor

board and calculating the values for output. If the monitor fails, the limit values are still monitored and acoustic

alarms are produced if necessary. The processor is an M68HC11 with external Flash ROM and RAM. The

necessary voltage of +5V is generated on the board itself (switching regulator).

Two acoustic alarms are generated (piezo electric signal transducer, loudspeaker) and two visual alarms.

An RS232 converter with optocoupler for electrical isolation is used for communication with a PC.

The second RS232 converter without electrical isolation is not used on this board.

A further task performed by the controller board is to manage the GUI (graphical user interface).

The signals of the capacitive sensor button on the front panel and of the incremental transducer (IGR) are read and processed by processor M68HC11.

In addition, the graphic output is generated on the LCD.

3 Components and functions

3.1.3 Power Distribution Unit PDU

Fig. 15: Power Distribution Unit PDU

1 PDU board

The task of the Power Distribution Unit PDU is to safeguard operating voltage and the constant current charge for the rechargeable battery.

Visual and acoustic alarms are generated for error statuses. If the output voltage of the power unit is greater than that of the battery,

then the A If the output voltage of the power unit falls below that of the battery

(power failure, voltage fluctuations, etc.) then the ventilator runs off the battery. This happens without electronic changeover (parallel mode).

The Power Distribution Unit PDU can only be switched on by a switched on by a rechargeable battery. This can also be discharged (≥ 10.8 V).

LIA ventilator runs completely off mains power.

Fig. 16: Power Distribution Unit PDU

3 Components and functions

Tasks

Voltage changeover

 Checking input voltage  Uninterrupted contactless changeover of the power supply sources

with consideration of the voltage hysteresis defined by the software

 Recharging the battery  Battery test under partial load  Visual LED test when A  Testing the piezo electrical signal transducer when A

LIA starts up

 Switching the compressor on and off  Communication with the micro controller  Checking the external air pressure supply

Changeover of the various voltages takes place without any contact. The current voltage source is indicated by the LEDs on the front of the

unit. The charge status of the battery is shown by three coloured LEDs (red,

orange and green). The charge curve is taken into consideration. The charge status can be

read off the LEDS:

 red = 10-40 %  orange = 40-90 %  green = 90-100 %

3 Components and functions

Fig. 17: Battery display

Testing the LEDs and

the piezo

Battery test

Once the ON switch on the front of the unit has been pressed, the system starts with a self-test which shows the user that the control elements are functioning. The self-test consists of the following sequence:

1. green LED of the mains power supply lights up

2. green LED of the 12V vehicle power supply lights up

3. green LED of the battery lights up

4. red LED of the battery lights up

5. piezo sounds

6. everything goes off again

The battery test is only carried out when A

LIA starts up.

The supply voltages are switched off internally for this purpose. The test is displayed by the red and green LEDs in the battery symbol

which flash alternately. The battery test is carried out with load on the battery by switching the

compressor on (approx. 2 amps for 6 s). This starts immediately after the self-test. A brief alarm is given if the system does not pass the battery test.

Total discharge

protection for the

battery

Total discharge protection comes into force when the measured voltage of the battery is <10.8V ( Batt_enable = 0). An acoustic and visual alarm is given.

The user should stop using the ventilator and recharge the battery, or provide another voltage source.

Compressor ON/OFF

The compressor is switched on/off without any contact.

+ 54 hidden pages

F. Stephan Alia Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Contents

1.1 Device name and manufacturer

1 General information

1.2 Maintenance and repairs

1.3 Abbreviations and definitions

1.4 Safety instructions

2 Mechanical structure

3 Components and functions

3.1 Electronic controls

3.1.1 Sensor board

3.1.2 Controller board

3.1.3 Power Distribution Unit PDU