NORTH AMERICAN DRÄGER Zeus User manual

4 (1)

Technical Documentation

Zeus

Anesthetic workstation

Revision 3.0 5133.001 9036190

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K5133001IECIVZ.fm 03.05.06

Contents

General

1	Symbols and Definitions	3
2	Notes	3
3	Abbreviations and Definitions	5

Function Description

1	General information about Zeus		9
	1.1	Intended use (summary from the Instructions for Use manual)	............................................. 9
	1.2	Product classification ..............................................................................................................	9
	1.3	Protection classes ..................................................................................................................	9
	1.4	Brief description of the system .............................................................................................	10

2	Anaesthetic Gas Box		13
	2.1	General introduction .............................................................................................................	13
3	PCB Box		15
	3.1	DIANA PCB ..........................................................................................................................	15
	3.2	VERONA PCB ......................................................................................................................	16
	3.3	Vent Power PCB ...................................................................................................................	18
	3.4	External Flow PCB ...............................................................................................................	19
4	CS Module		23
	4.1	Purpose ................................................................................................................................	23
	4.2	Gas supply ...........................................................................................................................	23
	4.3	DAGMAR mixed gas metering unit ......................................................................................	26
5	DIVA Anaesthetic Metering Unit		29
	5.1	General introduction .............................................................................................................	29
	5.2	DIVA supply module .............................................................................................................	30

Contents

	5.3	DIVA metering module ..........................................................................................................	33
6	Zeus Gas Measuring Module (GMZ)		39
	6.1	General introduction .............................................................................................................	39
7	Patient Gas Analyzer (PGA)		41
	7.1	General .................................................................................................................................	41
	7.2	IRIA .......................................................................................................................................	41
	7.3	ILCA 2 ...................................................................................................................................	43
	7.4	Servomex or Pato ................................................................................................................	44
8	System Gas Analyser (SGA)		49
	8.1	General introduction .............................................................................................................	49
	8.2	ILCA ......................................................................................................................................	50
	8.3	OxyTrace ..............................................................................................................................	54
9	Power supply unit		57
	9.1	General .................................................................................................................................	57
	9.2	Mains power input ................................................................................................................	57
	9.3	Output voltages .....................................................................................................................	58
	9.4	Uninterruptible power supply ................................................................................................	59
10	Dräger Water Trap		61
11	Blower		63
	11.1	General introduction .............................................................................................................	63
	11.2	Function ................................................................................................................................	63
12	Breathing System		67
	12.1	General introduction .............................................................................................................	67
	12.2	Components in the breathing system and their functions ....................................................	68
	12.3	Function ................................................................................................................................	70

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		Contents
13 Hermes Computer with Monitor		73
13.1	General .................................................................................................................................	73
13.2	CPCI computer .....................................................................................................................	73
13.3	Display screen ......................................................................................................................	74

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Maintenance Procedures

1	Water trap		79
	1.1	Replacement interval ............................................................................................................	79
	1.2	Replacing or draining the water trap ....................................................................................	79
2	Blower spindle		81
	2.1	Replacement interval ............................................................................................................	81
	2.2	Replacing the blower spindle ...............................................................................................	81
3	Filter mat in the power supply unit		83
	3.1	Replacement interval ............................................................................................................	83
	3.2	Location ................................................................................................................................	83
	3.3	Removing the cover .............................................................................................................	83
	3.4	Replacing the filter mat .........................................................................................................	83
4	Filter mat in the GMZ		85
	4.1	Replacement interval ............................................................................................................	85
	4.2	Replacing the filter mat .........................................................................................................	85
5	Removing/fitting the breathing system		87
6	Diaphragm mounts in the breathing system		89
	6.1	Replacement interval ............................................................................................................	89
	6.2	Removing the breathing system ...........................................................................................	89
	6.3	Replacing the diaphragm mount ..........................................................................................	89
	6.4	Fitting the breathing system .................................................................................................	91

III

Contents

7	Flow sensor “SpiroLife” in the breathing system		93
	7.1	Replacement interval ............................................................................................................	93
	7.2	Replacing the “SpiroLife” flow sensor ...................................................................................	93
8	Sampling-gas return-line filter		95
	8.1	Replacement interval ............................................................................................................	95
	8.2	Replacing the filter ................................................................................................................	95
9	Sintered-metal filters of the CS connections		97
	9.1	Replacement interval ............................................................................................................	97
	9.2	Replacing the sintered-metal filters ......................................................................................	97
10	Pressure regulators on the gas inlet block		99
	10.1	Replacement interval ............................................................................................................	99
	10.2	Location ................................................................................................................................	99
	10.3	Disassembly .........................................................................................................................	99
	10.4	Replacing the pressure regulators ......................................................................................	102
11	Batteries of the uninterruptible power supply		105
	11.1	Replacement interval ..........................................................................................................	105
	11.2	Location ..............................................................................................................................	105
	11.3	Replacing the rechargeable batteries .................................................................................	105

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Contents

Schematics and Diagrams

Schematics and diagrams

109

Annex

Technical Documentation acc. to EMV standard IEC/EN 60601-1-2: 2001

Test List

Spare Parts Catalogue

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VI		Contents

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General

Zeus	General

1Symbols and Definitions

WARNING

A WARNING statement provides important information about a potentially hazardous situation which, if not avoided, could result in death or serious injury.

CAUTION

A CAUTION statement provides important information about a potentially hazardous situation which, if not avoided, may result in minor or moderate injury to the user or patient or in damage to the equipment or other property.

NOTE

A NOTE provides additional information intended to avoid inconvenience during operation.

Definitions according to German standard DIN 31051:

Inspection	= examination of actual condition
Maintenance	= measures to maintain specified condition
Repair	=	measures to restore specified condition
Servicing	=	inspection, maintenance, and repair

2Notes

General Technical Documentation.fm
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This Technical Documentation conforms to the IEC 60601-1 standard.

Read each step in every procedure thoroughly before beginning any test. Always use the proper tools and specified test equipment. If you deviate from the instructions and/or recommendations in this Technical Documentation, the equipment may operate improperly or unsafely, or the equipment could be damaged.

It is our recommendation to use only Dräger parts and supplies.

The maintenance procedures described in this Technical Documentation may be performed by qualified service personnel only. These maintenance procedures do not replace inspections and servicing by the manufacturer.

The information in this Technical Documentation is confidential and may not be disclosed to third parties without the prior written consent of the manufacturer.

This Technical Documentation is for the purpose of information only. Product descriptions found in this Technical Documentation are in no way a substitute for reading and studying the Instructions for Use/Operating Manual enclosed with the product at the time of delivery.

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General	Zeus

Know-how contained in this Technical Documentation is subject to ongoing change through research and development and Dräger Medical reserves the right to make changes to this Technical Documentation without notice.

NOTE

Unless otherwise stated, reference is made to laws, regulations or standards (as amended) applicable in the Federal Republic of Germany for equipment used or serviced in Germany. Users or technicians in all other countries must verify compliance with local laws or applicable international standards.

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Zeus	Function Description

3Abbreviations and Definitions

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A-Box	Anaesthetic Gas Box
APL	Adjustable Pressure Limit
CAN	Controller Area Network
CPCI	Compact Peripheral Component Interconnect
DAGMAR	Digital Advanced Gas Mixer for Anesthesia Require-
	ments
DIANA	DIgita ANaesthestic controller in A-Box
DIVA	Digital Injection of Volatile Agent
DUMA	Flowmeter for volatile anaesthetic
DVI	Digital Video Interface
EEPROM	Electrically Eraseable Programmable Read Only
	Memory
Flash-ROM	Flash Read Only Memory
GMZ	Gas Measuring module Zeus
HERMES	Display and operating unit of Zeus
ILCA	Infrared Low Cost Analyzer
IRIA	Infrared Rapidly Identifying Analyzer
MIB	Management Information Base
MIR	Mid Infrared Range
MISO	Master Input Slave Output
MOSI	Master Output Slave Input
NIR	Near Infrared Range
PLD	Programmable Logic Device
PWM	Pulse Width Modulation
RAM	Random Access Memory
SDRAM	Synchronous Dynamic RAM
SNMP	Simple Network Management Protocol
SPI	Serial Peripheral Interface
SRAM	Static RAM
TFT	Thin Film Transistor
TIVA	Total IntraVenous Anesthesia
UART	Universal Asynchronous Receiver/Transmitter
USB	Universal Serial Bus
UPS	Uninterruptible Power Supply
Zeus	Name of anaesthetic workstation

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Function Description

Zeus	General

1General information about Zeus

Figure 1 View of the Zeus anesthesia workstation

1.1Intended use (sum- Zeus is an integrated anesthesia workstation for inhalation and intravenous

about.fm			mary from the	anesthesia. Zeus is used
about.fm			Instructions for Use	– in operating rooms as well as in induction and recovery rooms
			Instructions for Use
General_			manual)	– with anesthetic agents Isoflurane, Sevoflurane and Desflurane
				– in adults, children and neonates
ZEUS				– with gas mixtures O2/AIR, O2/N2O
onPrintedReleased03.05.06 F5133001	Copyrightreserved.reserved.	1.3	Protection classes	– with gas mixtures O2/AIR, O2/N2O
onPrintedReleased03.05.06 F5133001	Copyrightreserved.reserved.	1.3	Protection classes	Class I according to EN 60601-1.
				– in partial rebreathing to complete rebreathing mode
				– for operation with external fresh-gas outlet - non-rebreathing systems
				– for inhalation anesthesia, balanced and intravenous anesthesia
		1.2	Product classifica-	Class II b according to the Directive 93/42 EEC, Annex IX.
			tion
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General	Zeus

1.4Brief description of The integrated anesthetic workstation Zeus includes the following compo-

	the system	nents:
		– Windows NT computer with system display unit for operation of therapy
			control and monitoring
		– electronic gas and anesthetic agent flow control with closed-loop control
			system
		– electronically controlled and driven blower with rebreathing system
		–	airway monitoring
		–	hemodynamics monitoring module
		The following extensions are available as optional features:
		– Dräger syringe pumps for intravenous anesthesia
1.4.1	Configuration	The Zeus anesthesia workstation can be subdivided into the display and con-
		trol unit HERMES and the anesthetic gas box (A-Box).
		HERMES is a PC based system for display and control of the A-Box or other
		connected front-end units, such as the parameter box for measurement of
		hemodynamic values. In addition, HERMES provides all external interfaces
		of the Zeus anesthesia workstation, e.g. printer and serial ports.
		The anesthetic gas box (Figure 2) contains the actuators required for the sys-
		tem, the mixed-gas flow control, the anesthetic-agent flow-control, the breath-
		ing system, the lung ventilator and the monitoring system. The anesthetic gas
		box also comprises slots and interfaces for future optional features.
1.4.2	The most important	The anesthetic workstation Zeus has an excellent ergonomic design. This
	external characteristics	includes, for example:

– A system display unit mounted on a hinged arm that allows a 180° rotation. A second flat display (optional feature) can be arranged on top of the system display unit.

– A housing shape that is suitable both for left-hand/right-hand operation. This includes, besides the rotatable system display unit, a push-through work top and a push-through drawer. The absorber can be viewed easily from both sides.

– Concealed, left-hand and right-hand rails for mounting of accessories.

– O2 flush buttons that can be operated on left-hand side and right-hand side.

– A central locking brake for trolley castors that can be operated from both sides.

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001.5133	2 Figure	Zeus
	overview System

General

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Zeus	Function Description

2Anaesthetic Gas Box

2.1General introduction The anaesthetic gas box comprises the trolley and the housing of the Zeus.

Apart from the monitor, it includes all the components required to operate the functions of the Zeus. They include:

–Power supply unit

–Hermes computer

–PCB box

–CS module (CS = Central Supply)

–DIVA (digital anaesthetic metering unit)

–GMZ (Zeus gas measuring module)

–Blower (ventilator)

–Breathing system

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Zeus	Function Description

3PCB Box

The PCB box is a housing system for PCBs in the Zeus. It principally comprises the Transfer PCB, which performs the function of a motherboard. The Transfer PCB accommodates additional PCBs: the standard Zeus PCBs as well as PCBs for later options.

At present the PCB box holds the following PCBs:

–DIANA PCB

–VERONA PCB

–Vent Power PCB

–External Flow PCB

3.1DIANA PCB

3.1.1	Purpose	The DIANA PCB handles the communication of all system processors with
		the HERMES via an Ethernet link. By way of the Transfer PCB the relevant
		signals of various modules and the 24 V supply are routed to the DIANA
		PCB. The internal 3.3 and 5 V operating voltages are generated on the
		DIANA PCB by means of DC/DC-converters.
3.1.2	Function	The central module of the DIANA PCB is the processor MPC 850 (Figure 3).

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Figure 3 Block diagram of the DIANA PCB

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The operating program is located in a 4 or 8 MB Flash-ROM which is loaded into a 4 or 8 MB SDRAM as appropriate during start-up. Key software components can be stored in a 256 kB SRAM which is battery-buffered to protect against failure of the operating voltage. Key parameters can additionally be saved to an EEPROM via an I2C-port.

In addition to the memory modules, a CAN-controller and a four-way-UART are also connected to the system bus. The modules are selected by way of a PLD. The CAN-controller handles most of the communication with the other processors in the overall system with the aid of the installed SABUS-protocol. The four-way UART handles the communication with the ILCA module and with any subsequent add-ons. An Ethernet controller handles the communication with the HERMES system. The IRIA module and a serial port for Service are connected via an electrical isolator directly to the processor. The power supply unit generates a Power Fail signal indicating failure of its primary voltage (240 V mains voltage). The 24 V is also monitored in order to utilize time reserves prior to total failure of the supply voltage for regulation shutdown of the processor. An additional integrated module monitors the 3.3 V supply (Brown-Out monitor).

3.2VERONA PCB

3.2.1	Purpose	The VERONA PCB is required in the ZEUS to control the ventilator and to
		interface to the CAN bus. For this, a microcontroller system based on the
		PPC555 is used.
3.2.2	Function	The circuit is operated with a 24 V supply (Figure 4).

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Figure 4 Block diagram of the VERONA PCB

The voltage supply is fed in via an EMC-filter and monitored by the controller. The controller PPC555 has an internal RAM which can be optionally batterybuffered. The following operating voltages are generated on the PCB:

–3.3 V for microcontroller

–5 V for temperature sensors

–5 V for digital modules

–12 V for pressure sensors

The processor system has two serial ports (max 115 kbaud). Two CAN-inter- faces actively support the Full CAN V2.0A and V2.0B-protocol at up to 1Mb/s. The CAN-buses are each isolated from the rest of the system and from each other by an isolating voltage of at least 500 V AC. Optocouplers are used to isolate the signals. To activate the blower motor the board has a dedicated interface. The power electronics for the blower are located on the Vent Power PCB. For speed evaluation the three TTL-signals Hall-A, Hall-B and Hall-C

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Function Description	Zeus

are delivered by the motor electronics. The motor temperature is evaluated, as are the other temperature sensors. 6 LEDs are provided for output of status signals. The following LEDs are interesting for service work:

–12 V supply voltage = LED V405

–5 V supply voltage = LED V402

If only LED V302 of the 4 LEDs between the SUB-D connectors is lit the hardware is in test mode.

3.3Vent Power PCB

3.3.1	Purpose	The Vent Power PCB contains the power electronics to activate the blower
		and the external valves. It provides the link between the valve control and the
		pneumatic system.
3.3.2	Function	The respective power stages can be disabled by an external signal (Figure
		5).

Figure 5 Vent Power PCB block diagram

This signal is generated by an independent monitoring computer. In addition to the power stages, the sender information from the TurboVent and the status signals of the various output stages are processed and passed on for evaluation to the TurboVent control computer. The supply voltage of the TurboVent is 48 V DC and that of the valves is normally 24 V. Because of the different supply voltages and the substantial peak currents in the TurboVent activation circuit these blocks are electrically isolated by optocoupler.

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Zeus	Function Description

The supply voltage for the TurboVent is externally stabilised in the power supply unit to 48 V and has a current limit of 3 A. An external 68000 uF capacitor is included to deal with the high peak currents of the motor.

The function of the blower power stage is to provide phase-adjusted activation of the motor coil with the aid of the Hall sensors built into the motor and to control the speed of the motor. The Hall signals are formatted by an inverter and passed to the Hall decoder. This module decodes the Hall signals of the motor and codes the activation signals of the MOSFET driver from them. The power MOSFETs are activated by a MOSFET driver. The output stage comprises 3 half-bridges each with two identical n-channel MOSFETs. At a TurboVent electronics supply voltage below 38 V a protective circuit disables the MOSFET activation. As the motor is run in a highly dynamic mode at high speeds, the power stage is rated for a peak power output of approximately 480 W. The mean load in operation is approximately 100 W.

The fan delivers one pulse per fan wheel revolution. This pulse is filtered by an RC element and routed to a retriggerable monoflop. If the pulses are not received, the monoflop drops out and disables the power electronics for the TurboVent. This ensures that the TurboVent is only activated when the fan is running. This prevents harmful overheating or excessive oxygen concentration build-up at the TurboVent motor.

The Vent Power PCB also contains the activation electronics for the valves in the breathing system and their interface to the TurboVent control computer. Additionally, the Ventilator-OFF signal is evaluated by the DIANA PCB to cut the power to the driver stages.

The A-cone valve is a single-turn bipolar valve. The turn must be activated in bipolar mode by a voltage pulse. This valve driver is independent of the Ven- tilator-OFF signal.

The power electronics for the flow valves are located directly at the pneumatic interface underneath the valves, and not on this PCB. However, the valves are shut off by the Ventilator-OFF signal by way of a HIGH-side FET switch on this module. The switch cuts the supply voltage to the flow valves.

The valves, seal, fresh gas, switch-over and BAG are controlled by a low-side MOSFET switch. This module has a monitoring output which is routed to the TurboVent control computer. The monitoring covers short-circuit and open load.

3.4External Flow PCB

3.4.1 Purpose	The “Alveon” flow sensor is designed for adult patient-local directional flow
	measurement and is built into the patient Y-piece. The External Flow PCB
	digitises the sensor signals and supplies the data via SPI.

3.4.2External Flow PCB func- The External Flow PCB circuitry is divided into 3 areas (Figure 6):

tion	– Supply voltage with electrical isolation from the overall system

	– Analog measurement processing
	– Digital measurement processing with data interface and electrical isola-
	tion from VERONA PCB via SPI

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Function Description	Zeus

Figure 6 External Flow PCB block diagram

3.4.3Sensor measurement The “Alveon” flow sensor is based on the principle of a filament anemometer

principle	(Figure 7). In conjunction with the Zeus anaesthetic workstation, the measur-
	ing wire (2) is used for compensation of the breathing gas, the measuring
	wire (3) for “flow measurement” and the measuring wire (5) with the shading
	(4) for detecting the direction of flow.

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Zeus	Function Description

Figure 7 “Alveon” flow sensor layout

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	Description

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