evitaxl_technical_documentation_rev_5-0.pdf
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Technical Documentation
EvitaXL
Intensive Care Ventilator
Revision 5.0
5664.590
9036054
Because you care
Page 3
Contents
General
1
Symbols and Definitions
3
2
Notes
3
Function Description
1
General
7
2
Basic principle
7
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3
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
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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
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57
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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
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Contents
Schematics and Diagrams
1
Piping and function diagram
91
Annex
Test List
Technical Information
K5664590IECIVZ.fm 09.03.06
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IV
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General
1
Page 8
2
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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.
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Version 3.0_ Released_Printed on_09.03.06_KGeneral.fm
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
EvitaXL
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All rights reserved. Copyright reserved.
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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Function Description
5
Page 12
6
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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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2.4
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
22
24
9
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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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3
EvitaXL
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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
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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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3.3
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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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Function Description
Processor Board
PCB
The Processor Board PCB controls the heating (CO2 measuring unit) and the
measured-data transfer of the CO2 sensor.
18
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Figure 10 Block diagram of the Processor Board PCB
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EvitaXL
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3.6
Power Supply PCB
Function Description
The Power Supply PCB provides the supply voltages for the Processor Board
PCB and the CO2 sensor. The supply voltages are electrically isolated from
the machine. The CO2 measured values are transmitted to the CPU 68332
PCB via the Power Supply PCB.
Figure 11
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Block diagram of the Power Supply PCB
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Function Description
3.7
Power pack
EvitaXL
The switched-mode power pack provides the following output voltages:
–
+24 V
–
+15 V
–
-15 V
–
+12 V
–
+5 V
The output voltages are short-circuit-proof.
3.7.1
DC module (option in
converted Evita 4 or
Evita 2 dura units)
The DC module makes sure that the device is powered in the event of a
mains voltage failure.
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Figure 12 Schematic circuit diagram of the switched-mode power pack