Technical Documentation
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Technical Documentation EvitaXL Intensive Care Ventilator
Revision 5.0 5664.590 9036054
Because you care
Contents General 1
Symbols and Definitions
3
2
Notes
3
Function Description 1
General
7
2
Basic principle
7
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2.1
Control panel ... 8
2.2
Electronics ... 8
2.3
Pneumatics ... 8
2.4
Simplified block diagram ... 9
Electronics
10
3.1
CPU PCB 68332 ... 10
3.2
CO2 Carrier PCB ... 12
3.3
CO2 measurement ... 15
3.4
CO2 sensor ... 16
3.5
Processor Board PCB ... 18
3.6
Power Supply PCB ... 19
3.7
Power pack ... 20
3.8
Graphic Controller 8 PCB ... 21
3.9
Communication PCB (optional) ... 24
3.10 Pediatric Flow PCB (optional) ... 26 3.11 IFCO Carrier PCB for additional optional features ... 27 3.12 SmartCare PCB (option) ... 28 3.13 Pneumatic Controller PCB ... 29 3.14 HPSV Controller PCB ... 33
I
Contents 4
5
6
7
Pneumatics
34
4.1
Gas connection block ... 35
4.2
Parallel mixer ... 38
4.3
Inspiratory block ... 42
4.4
Patient system ... 44
4.5
PEEP/PIP valve ... 46
Theory of operation
47
5.1
AIR supply ... 47
5.2
O2 supply ... 48
5.3
Inspiratory phase ... 49
5.4
Paw high alarm limit ... 50
5.5
Emergency pressure relief mechanism (safety valve) ... 50
5.6
Expiration ... 50
Gas mixture
52
6.1
Correcting the oxygen cartridge valve ... 52
6.2
Dependence on the supply pressure ... 52
Function diagram
53
Maintenance Procedures 1
Cooling-air filter 1.1
Ambient-air filter 2.1
II
Replacing the ambient-air filter ... 59
Lithium battery (CPU 68332 PCB) 3.1
59
61
Replacing the lithium battery (CPU 68332 PCB) ... 61
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Replacing the cooling-air filter ...57 All rights reserved. Copyright reserved.
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57
Contents 4
Real-time clock 4.1
63
Replacing the real-time clock ... 63
Service Diagnosis Mode 1
General
69
2
Call-up of service diagnosis mode
71
3
Diagnosis ’Front’
72
3.1 4
5
Diagnosis ’Electronic’
73
4.1
Diagnosis page ’Processor’ ... 73
4.2
Diagnosis page ’Sensors’ ... 76
4.3
Diagnosis page ’add. HW’ ... 78
Diagnosis ’Pneumatic’
79
5.1
Diagnosis page ’Processor’ ... 79
5.2
Diagnosis page ’Sensors’ ... 80
5.3
Diagnosis page ’Valves’ ... 83
Diagnosis ’Other’
85
6.1
Diagnosis page ’Lokbook’ (error list) ... 85
6.2
Diagnosis page ’Option Release’ ... 88
6.3
Diagnosis page ’SW Info’ ... 88
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Diagnosis page ’Processor’ ... 72
III
Contents Schematics and Diagrams 1
Piping and function diagram
91
Annex Test List Technical Information
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IV
General
1
EvitaXL 1
Symbols and Definitions
General
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:
2
Notes
Inspection
= examination of actual condition
Maintenance
= measures to maintain specified condition
Repair
= measures to restore specified condition
Servicing
= inspection, maintenance, and repair
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 information in this Technical Documentation is confidential and may not be disclosed to third parties without the prior written consent of the manufacturer. All rights reserved. Copyright reserved.
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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.
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. 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.
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General
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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.
Function Description
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Function Description
1
General
The machine is a time-controlled, constant-volume long-term ventilator for adults and children.
2
Basic principle
The machine communicates via a serial interface (CAN) and consists of the following assemblies: –
Control panel
–
Electronic assembly
–
Pneumatic assembly
Figure 1
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Assemblies of the machine
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Function Description Control panel
The control unit is the interface between the machine and the operator. The control unit is used to set parameters, it displays measured values, and generates warnings. The control unit comprises the following subassemblies: –
15“ TFT display
–
Membrane keypad
–
Touchscreen with resistive touch
–
Rotary encoder
–
Graphic Controller 8 PCB
–
Connector PCB
Electronics
The electronic assembly is the central control unit. The electronic assembly includes the CPU 68332 PCB, the CO2 Carrier PCB with the Processor PCB and the Power Supply PCB, and the power pack (Communication PCB, Pediatric Flow PCB, IFCO Carrier PCB, and the SpO2 PCB as option).
2.3
Pneumatics
The pneumatic assembly controls the pneumatic valves following preset ventilation parameters. The pneumatic assembly includes an independent microprocessor system and the valve control. The pneumatic assembly comprises the Pneumatic Controller PcB, the HPSV Controller AIR/O2 PCB, the PEEP valve, the mixer, the compressed-gas connection, the flow sensor, and the O2 sensor.
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2.2
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2.1
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Simplified block diagram
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Figure 2
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Function Description
Basic principle
1
Keys
13
Supply voltages
2
Rotary encoder
14
Power switch
3
Touchscreen
15
Second inspiratory Paw
4
TFT display
16
Reset pneumatics processor and venting
5
Information LEDs and Alarm LEDs
17
Electronic processor reset and second loudspeaker alarm
6
CAN bus
18
Inspiratory Paw
7
Graphics processor reset
19
O2 sensor
8
Not applicable
20
FiO2 (HPSV mixer)
9
Loudspeaker with sound 21 chip
AIR (HPSV mixer)
10
Second loudspeaker (piezo)
flow sensor
11
Voltage monitoring (acti- 23 vates reset of the processors and the piezo)
Expiratory valve with PEEP
12
Rechargeable battery (Goldcap capacitor)
Expiratory Paw
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24
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Function Description
3.1
CPU PCB 68332
The CPU 68332 PCB is integrated in the electronic assembly of the machine. The CPU 68332 PCB includes an independent microprocessor system, two external interfaces, three internal interfaces, the loudspeaker control and a serial EEPROM.
Figure 3
Block diagram of the 68332 PCB
3.1.1
EEPROM
The EEPROM is connected to the synchronized, serial interface of the 68332. The EEPROM characterizes the machine (enabled options, serial number, etc.).
3.1.2
Microprocessor system
The microprocessor systems consists of a 68332 CPU, a 512 kB randomaccess memory (RAM), and a 1 MB electrically programmable and electrically erasable read-only memory (flash EPROM). The RAM is battery-buffered. When the battery is being replaced a Goldcap capacitor ensures voltage supply of the RAM. Programming of the flash EPROMs is only possible if the system identifies the “SERVICE-Q” signal.
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Electronics
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EvitaXL
Function Description
3.1.3
RS232 interface
The CPU 68332 PCB provides an RS232 interface in the Evita. The interface is labeled COM1. Optocouplers electrically isolate the RS232 interface from the machine.
3.1.4
ILV port
The ILV interface allows for independent lung ventilation with two machines. The ILV interface is not electrically isolated. Pin 3 of the ILV interface is provided with a filler plug. This filler plug prevents confusion with the RS232 interface.
3.1.5
Driver
The driver adjusts the access times between the 68332 CPU, the clock and the DUART.
3.1.6
Clock
The clock makes sure that the current time is displayed. The clock is batterybuffered. This is to ensure that the clock is supplied with the required operating voltage after the device is switched off.
3.1.7
DUART
The DUART (Dual Universal Asynchronous Receiver/Transmitter) has two serial interfaces and digital inputs and outputs. The SpO2 module and the CO2 module are connected to the serial interfaces.
3.1.8
DC/DC converter
The DC/DC converter generates the voltage “+5 V ISO” required for the interface. The input voltage of the DC/DC converter is +5V.
3.1.9
CAN interface
The CAN interface is a fast, serial interface. Via the CAN interface the control unit can communicate with the electronic and pneumatic assemblies. The transmission rate is 800 kbit/s.
3.1.10 Bus driver
Via the bus driver, the signals from the address bus, the data bus, and the control bus are transmitted to the motherboard. The 68332 CPU uses the bus driver to communicate with the optional printed circuit boards installed on the motherboard (currently the Pediatric flow PCB (optional Neoflow feature)).
3.1.11 Sound generator
The sound generator controls the loudspeaker in the control unit. The sound generator includes the sound volume control and the tone generation of the loudspeaker. The sound volume is controlled by the DUART.
3.1.12 Reset logic
The CPU 68332 PCB uses a reset signal to reset (restart) the control unit and the pneumatic assembly. A reset is also triggered when the +5 V operating voltage is not reached (too low or too high). The pneumatic assembly can also send a reset signal to the CPU 68332 PCB, thus resetting the CPU 68332 PCB. The reset logic controls and displays the resets.
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Function Description CO2 Carrier PCB
The CO2 Carrier PCB is integrated in the electronic assembly of the Evita. The printed circuit board includes the mount and the electrical isolation of the CO2 module and the SpO2 module, the mains voltage failure logic, the temperature measurement and the voltage monitoring.
Block diagram of the CO2 Carrier PCB
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Figure 4
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3.2
EvitaXL
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Function Description
Figure 5
Block diagram of the CO2 Carrier PCB, part 1
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Block diagram of the CO2 Carrier PCB, part 2
3.2.1
Electrical isolation
Optocouplers electrically isolate the printed circuit boards from the interfaces. The printed circuit board is provided with plug-in contacts. The SpO2 and CO2 modules are plugged into these plug-in contacts. The X3 connector is part of the optional “SpO2” module and is not equipped.
3.2.2
Mains voltage failure logic
The mains voltage failure logic monitors the mains voltage supply. In the event that a mains voltage failure occurs while the machine is operating an audible alarm will sound.
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Figure 6
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Function Description
EvitaXL 3.2.3
Voltage monitoring
Function Description The microprocessor monitors the following voltages: –
15 V
–
+10 V
–
+24 V
–
+12 V
–
+5 V
All voltages are present at a voltage divider. An A/D converter reads out the respective voltages. The CPU 68332 PCB reads out the AD converter. 3.2.4
Measurement of temperature and pressure
A temperature sensor measures the current temperature. The temperature sensor is a thermistor (NTC). A temperature hybrid outputs the respective analog voltage value. The output signal from the temperature hybrid is transmitted to an A/D converter which converts the analog voltage value in a digital value. The CPU 68332 PCB reads out the digital value. A pressure sensor measures the current ambient pressure. The output signal from the pressure sensor is transmitted to an A/D converter which converts the analog voltage value in a digital value. The CPU 68332 PCB reads out the digital value.
CO2 measurement
The CO2 measuring system comprises three modules: –
CO2 sensor
–
Processor Board PCB
–
Power Supply PCB
Figure 7
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Block diagram of the CO2 measurement
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Function Description 3.4
CO2 sensor
EvitaXL The CO2 sensor comprises the CO2 measuring unit and a microprocessor system. A lamp generates a light spectrum of up to 4.5 m. This light travels through the cuvette and two sapphire discs and reaches the detectors. The detectors emit electrical signals depending on the CO2 concentration. The microprocessor analyzes these signals and transmits them to the Processor Board PCB via an RS232 interface. The CO2 measuring unit is kept at a constant temperature to avoid condensation.
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Sectional view of the CO2 sensor
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Figure 8
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Function Description
Figure 9
Block diagram of the CO2 sensor
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