Dräger Medical Vamos Guide

Vamos
Variable Anesthetic Gas Monitor
Technical
Documentation
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Contents
For internal use only. Copyright reserved. D6494340T01IVZ.fm 21.08.02
6494.340 Vamos Contents 2
Function Description
1Introduction 7
1.1 What’s what? .......................................................................................... 7
1.2 Screen content ........................................................................................ 8
1.3 Operating modes .................................................................................... 9
2Operating concept 9
2.1 Power-up behavior ................................................................................ 10
2.2 Alarms ................................................................................................... 10
2.3 Menu structure .......................................................................................11
2.4 Simplified Vamos block diagram ........................................................... 12
3ILCA patient gas module 13
3.1 Patient gas module structure ................................................................ 14
3.2 Sensor head function ............................................................................ 15
3.3 Sensor head operation ........................................................................ 20
3.4 Measured value units ............................................................................ 21
3.5 Pneumatic system ............................................................................... 22
3.6 Tubing ................................................................................................... 22
3.7 Pump .................................................................................................... 23
3.8 MOPS PCB ........................................................................................... 24
3.9 AMO FLOW ILCA PCB (flow controller) ............................................... 26
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Contents
For internal use only. Copyright reserved. D6494340T01IVZ.fm 21.08.02
6494.340 Vamos Contents 3
4AMO O2 GRAF PCB 29
5VAMOS PCB 31
6SpO2 PCB 32
7Screen 32
8Water trap 32
9Desktop power pack 33
10 Starting the release mode 34
10.1 Screen content release mode ............................................................... 35
10.2 Entering the release code ..................................................................... 35
Service Mode
1Starting the service mode 37
1.1 Explanation of screen content .............................................................. 38
Repair Instructions
1Service strategy 39
2VAMOS service programs 40
2.1 Download program ............................................................................... 40
2.2 VISIA program ...................................................................................... 40
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Contents
For internal use only. Copyright reserved. D6494340T01IVZ.fm 21.08.02
6494.340 Vamos Contents 4
3Repair information list 41
4Hardware configuration of VAMOS 42
4.1 Repair components ............................................................................... 44
5ILCA 45
5.1 Electrical data of ILCA sensor head ..................................................... 45
5.2 Pneumatic system ................................................................................ 48
5.3 AMO FLOW ILCA PCB ......................................................................... 50
6Options 51
6.1 Optional battery .................................................................................... 51
6.2 SpO2 option .......................................................................................... 52
7Alarms and their meaning 53
7.1 Behavior of Vamos in case of alarms ................................................... 53
7.2 General alarms ..................................................................................... 54
7.3 SpO2 measurement alarms .................................................................. 54
7.4 Gas measurement alarms .................................................................... 57
8Vamos disassembly 61
8.1 Housing rear panel disassembly ........................................................... 61
8.2 Basic frame disassembly ...................................................................... 62
8.3 ILCA module disassembly .................................................................... 63
8.4 PCB-set disassembly ............................................................................ 65
8.5 VAMOS PCB disassembly .................................................................... 68
8.6 ILCA sensor-head disassembly ............................................................ 68
8.7 Pump disassembly ................................................................................ 69
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Contents
For internal use only. Copyright reserved. D6494340T01IVZ.fm 21.08.02
6494.340 Vamos Contents 5
Software download
1Software download (PGM or MFM software) 70
1.1 Software download precautions ............................................................ 70
1.2 Test Equipment ..................................................................................... 71
1.3 Typographic Conventions ..................................................................... 71
1.4 Software Download Procedure ............................................................. 72
VISIA program
1VISIA program description 79
1Error list to function blocks 82
1.1 Monitor .................................................................................................. 82
1.2 Rechargeable battery ........................................................................... 83
1.3 Measured value display ........................................................................ 85
1.4 Text display ........................................................................................... 88
1.5 Menu ..................................................................................................... 89
1.6 Keys ...................................................................................................... 93
1.7 Control knob ......................................................................................... 94
1.8 LEDs ..................................................................................................... 95
1.9 Acoustic signal ...................................................................................... 96
1.10 Serial communication ........................................................................... 97
1.11 Processor .............................................................................................. 97
1.12 Software ................................................................................................ 98
1.13 Fan ........................................................................................................ 99
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Contents
For internal use only. Copyright reserved. D6494340T01IVZ.fm 21.08.02
6494.340 Vamos Contents 6
Schematics and Diagrams
1VAMOS block diagram 100
PMS
1. Unit, general 101
2. Spare parts used 102
3. Safety Checks 103
4. Test items 106
5. Supply unit to customer ready for operation. 111
6. Confirmation of test 111
7. These steps are regarded as repair work and are therefore not included in
the inspection service price. 111
8. Annex 112
Installation instructions114
Spare parts list 118
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6494.340 Vamos Version 3.0 Function Description
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7
Function Description
1 Introduction
1.1 What’s what?
Key to front view
1 Screen 5 Indicator lamps for alarm
2 Central control knob for selection and
confirmation
6 Powerindicatorlamp
Mains voltage = green
Battery operation = yellow
3 Standby Key 7 Water trap WaterLock
4 Key for silencing the alarm sound for
2 minutes
8 Connection for sampling line
D
Vamos
7
5
4
3
812
6
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6494.340 Vamos Version 3.0 Function Description
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8
1.2 Screen content
Key to rear view
9 ON/OFF switch 13 "SpO2" connection for SpO2
sensor
10 "15 V DC" connection for desktop power
pack
14 Outlet for sampling gas
scavenging or return line
11 Connection for RS 232 interface
(Medibus)
15 Handle
12 Connection for RS 232 interface
Key to possible screen content
1 Alarm window 8 Window for real-time curve
2 Status window 9 Displayed parameter
3, 4, 5,
6, 7
Parameter window 10 Scaling of real-time curve
9 10 11 12 13 14
15
CO2
[mmHg]
0
0
Fet
Fi N2O
[%]
0.0
0.0
Hal
[%]
0.0
0.0
SpO2
HR
0
0
CO2
0
115
♥
12
3
4
5
6
7
8
9
10
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6494.340 Vamos Version 3.0 Function Description
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9
1.3 Operating modes
The operating modes of Vamos are defined as follows:
2 Operating concept
The central control element is the control knob on the front plate. The control knob
has two functions:
−Rotate = select/set
−Press = confirm
The two buttons on the front plate have the following functions:
−Button to silence the alarm for 2 minutes.
−Standby key.
Measuring
mode:
The measured values of the sensors are displayed on-screen.
Standby: Vamos is switched on. No measured value is shown on the
screen, but the following message:
”Standby”
”Software XX.XX” (XX.XX = MFM software version)
The light in the standby key should come on. In "Standby" mode
the pump of the ILCA module is off.
AC mains
supply
operation:
Vamos is in standby mode or in measuring mode and is powered
from the desktop power pack. The power-on indicator light should
turn green.
Battery
operation:
Vamos is in standby mode or in measuring mode and is powered
from the internal rechargeable battery (optional). The power-on
indicator light should turn yellow.
Charging mode: The optional internal rechargeable battery is charged from the
desktop power pack.
No operation: None of the above operating modes is active.
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6494.340 Vamos Version 3.0 Function Description
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10
2.1 Power-up behavior
1. All LEDs are actuated.
2. Bleeps and screen test
3. LEDs are actuated one after the other. LED sequence: Standby, silence, advisory,
alarm, standby.......
4. Standby screen
2.2 Alarms
Vamos classifies alarm signals into three priorities, identified by up to three different
exclamation marks. Alarm messages with a higher priority supersede those with a
lower priority.
Alarm priority Alarm tone LED
Alarm = !!! (highest priority) intermittent The red (top) LED
flashes
accompanied by a
tone sequence at
2.5-second
intervals.
Caution = !! (medium priority) intermittent The yellow
(bottom) LED
flashes
accompanied by a
tone sequence at
30-second
intervals.
Advisory = ! (lowest priority) once The yellow
(bottom) LED
comes on
accompanied by a
single tone.
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6494.340 Vamos Version 3.0 Function Description
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11
2.3 Menu structure
Fig. 1: Vamos menu structure
--->
Alarm Agent
CO2 SpO2
Sound Language
CO2 --->
Unit mmHg
kPa
Range
0-110
0-75
Vol%
Alarm --->
FiCO2
EtCO2
FiHal
50.0
1.5
5.0
---
SpO2
Pulse
---
92
12050
--->
Hal
Enf
Iso
Sev
Des
Agent
Sound --->
Pulse 0
Alarm 1
Language --->
en
de
SpO2 --->
Slow
Fast
Normal
Mode
fr
es
nl
sv
it
Cal
Param. Config.
--->
high
low
1200
9600
19200
Brightn.
(Baud)
Medibus
Config.
Parameter --->
Gases on
SpO2
off
on
off
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6494.340 Vamos Version 3.0 Function Description
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2.4 Simplified Vamos block diagram
Fig. 2: Vamos block diagram
The ILCA patient gas module has no automatic anesthetic detector. The anesthetic
being used must be specified by the user. Only one anesthetic may be used at any
one time. The ILCA patient gas module conforms to the accuracy specified in the ISO
standard.
ILCA
Fan
VAMOS PCB
1.5 KV
1.5 KV
PCB
SpO2 Horn PCB
Charge
Control Knob
Keys
Screen
12 V battery (option)
Front
Rear
Desktop
power
pack
RS 232
Medibus
RS 232
PC
SpO2
Sensor
Gas outlet Water trap
ON/OFF
RS 232
BUS
RS 232
15 VDC
Indicator
lamps (LEDs)
RS 232
RS 232
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6494.340 Vamos Version 3.0 Function Description
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13
3 ILCA patient gas module
Fig. 3: ILCA patient gas module components in Vamos
MOPS PCB
AMO FLOW ILCA PCB
AMO ILCA PCB
AMO O2 GRAF PCB
SpO2 PCB
RS232 - Medibus
VAMOS PCB
POWER
RS232
RS232 - PC
Battery with
charging circuit
(optional)
1,5 KV separation
1,5 KV separation SpO2
ON/OFF switch
SpO2 sensor
Ext. power supply
unit
(4 kV separation)
Screen
Control Knob
Sampling gas scavenging line
Water trap
Pump
Valve
ILCA sensor head
Fan
(monitored)
ILCA
Only the components
inside the dashed line
belong to the ILCA
module.
Keypad with status LEDs
Particle
filter
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6494.340 Vamos Version 3.0 Function Description
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14
3.1 Patient gas module structure
The ILCA patient gas module comprises the following components:
−Sensor head (electronics and optical system)
−Pump
−Valve
−AMO ILCA PCB (AMO = adapter for MOPS PCB)
−AMO FLOW ILCA PCB (flow controller)
−MOPS PCB (with PGM software, PGM = Patient Gas Module)
−AMO O2 GRAF PCB (with MFM software, MFM = Multi Function Module)
−PCB mounting frame
Fig. 4: Components of the ILCA module
Sensor head
Valve
MOPS PCB
AMO FLOW ILCA PCB
AMO O2 GRAF PCB
Pump
AMO ILCA PCB
Mounting frame
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6494.340 Vamos Version 3.0 Function Description
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3.2 Sensor head function
Fig. 5: Sensor head block diagram
Light emitter
22 Hz éù_éù_
NTC
Pressure
sensor
4-channel
detector
1st pre-
amplifier
2nd pre-
amplifier
Light emitter
control
Pressure
Temperature
measurement
and control
8-channel multiplexer
Track & Hold
8-channel A/D converter
MOPS PCB
Cuvette
Data Control signals
Data
Control signals
BASE PCB
ILCA
Sensor
head
(AMO ILCA
PCB)
VV PCB
(Pre-amplifier)
Patient
gas
Heater
(FET)
AMO ILCA PCB
EEPROM
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6494.340 Vamos Version 3.0 Function Description
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16
The hardware of the ILCA sensor head comprises the following three PCBs:
Fig. 6: Sensor head, sectional view
VV PCB: −1st amplifier for all channels of the four-channel detector
including high/low pass combinations and EMC configurations.
BASE PCB: −2nd amplifier for all channels of the four-channel detectorLight
emitter actuation, temperature control, absolute pressure
measurement, AD converter, multiplexer, serial EEPROM.
AMO ILCA
PCB
−Generation of the supply voltages
−Digitally adjustable voltage for the light emitter via the
MOPS PCB.
−Heating voltage
−Supply to ILCA
−and setpoint setting for the sensor head heating (digital
potentiometer).
−Data transport: ILCA sensor ↔MOPS PCB for data evaluation
Key to sensor head sectional view
1 Light emitter (infrared range) 6, 7 PCBs
2 Reflector 8 Cuvette heating (FET)
3 CaF2disc of light emitter 9 Pressure sensor
4 Cuvette 10 Cuvette inlet and outlet
5 Multispectrum detector
124569
7108
3
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6494.340 Vamos Version 3.0 Function Description
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17
3.2.1 Light emitter with reflector
The reflector is ellipsoid in shape. The light emitter is positioned at the vertex of the
ellipsoid. As a result, a beam is directed at an angle of incidence of < 12° onto the
opposite detector.
The emitting element of the light emitter is a filament made of resistor wire. The alloy
comprises Cr, Ni, Al. The filament wire is 40 µm thick.
In the assembled sensor, the reflector with built-in light emitter is encapsulated away
from the interior of the sensor head by a CaF2disc. This design prevents sampling
gas from reaching the hot light emitter, and igniting oxygen and the anesthetic, in the
event of a leak in the cuvette. Furthermore, any gaseous substances emitted by the
hot light emitter are kept away from the cuvette. This avoid an undesired coating on
the optical components as a result of prolonged use.
3.2.2 Light emitter specification
Cold resistance Rc = 13.0 ohms ± 11%
Hot resistance Rh = 13.0 ohms * 1.06 = 13.78 ohms ±11%
Peak output = 290 mA * 290 mA * 13.78 ohms = 1.16 W
3.2.3 Light emitter control circuit
The light emitter is operated with a square-wave modulated constant current of
290 mA at 22.0 Hz.
This light emitter current is measured with an AD converter (shunt resistor
0.5 ohms ± 2%) and monitored by the software of the MOPS PCB.
The supply voltage of the light emitter control circuit is also monitored by AD converter
and voltage divider. The setpoint is set via a digital serial potentiometer controlled by
the MOPS PCB.
The supply voltage is measured when the light emitter is off (low phase of light emitter
modulation).
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6494.340 Vamos Version 3.0 Function Description
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18
3.2.4 Light emitter protection circuits
When the connection between the MOPS PCB and the BASE PCB is interrupted, a
protection circuit immediately shuts down the light emitter.
A protection circuit also prevents the average light emitter current from exceeding
81 mA (tolerance = 3%) in the event of a fault (e.g. software crash). The response
time (tA) of the protection circuit is 65 ms ±15 ms. This condition applies when the
light emitter was previously off and is then switched to continuous current.
3.2.5 Cuvette
The sampling gas is routed through a cuvette in the sensor head. In the optical beam
path it is sealed on each side by a bonded-in CaF2 glass window pane. The gas inlet
and outlet form the two connectors. The direction of flow of the sampling gas is
indicated by arrows on the housing adjacent to the connectors.
For absorption reasons the distance between the light emitter window and the
detector window is 6 mm.
3.2.6 Multispectrum detector
In the multispectrum detector the optical beam path is distributed across the four
measuring channels and routed to the relevant detector chip by infrared narrow-band
filters.
The optical beam enters the multispectrum detector through a hermetically sealed
window. On the floor of its housing is a matrix-style array of four-sided reflective
pyramids with a side length of 0.15 mm x 0.15 mm (beam splitters). The optical beam
entering through the window hits this beam splitter and is split by each individual
pyramid in pixel style into four separate beams. The pixel-style design results in a
genuine beam mix, which is insensitive to partial contamination in the beam path. The
housing also contains four infrared optical narrow-band filters and four pyroelectric
detector chips. These components are arranged such that one infrared filter detector
combination is illuminated by each of the four beam paths emitted from the beam
splitter. Each of the four beam paths represents a measuring channel. The basic
design of the multispectrum detector is shown in the following diagram:
Notice:
Do not generate an excess pressure in the cuvette.
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6494.340 Vamos Version 3.0 Function Description
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19
Fig. 7: Basic design of the multispectrum detector
The infrared optical filters (band-pass filters) are dimensioned in terms of their
wavelength such that light is transmitted in three channels at the wavelength of the
sampled gases. The remaining spectrum is blocked by these three filters. When a gas
is present light is absorbed and the resultant change of intensity measured in the
respective channel is a measure of the concentration of the gas.
The fourth channel (reference channel) measures at a wavelength at which none of
the sampled gases absorbs. With the reference signal, ambient influences such as
temperature fluctuations, cuvette contamination, and light emitter aging are
compensated and corrected.
The detector elements and the upstream filters are tilted 30°. As a result, the reflected
beam strikes perpendicular to the filter plane and the detector plane.
3.2.7 Pressure sensor
The ILCA sensor head delivers its measured values as partial pressures or as the
non-pressure-dependent unit vol.%. Fluctuations in cuvette pressure have no effect
on the measured values. An absolute pressure sensor measures the pressure in the
cuvette and, where appropriate, the ambient pressure (e.g. during zeroing).
The pressure measurement is fast enough to represent fluctuations in respiratory
pressure (T90 better than 200 ms).
CO2
Ref.
N2O
Anesth. gas
Sensor window Light beams
Infrared filter
Sensor chip Beam splitter
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6494.340 Vamos Version 3.0 Function Description
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20
Measuring range:
The sensor head is able to measure at ambient pressures between 670 mbar and
1100 mbar. For the measuring range of the pressure sensor it should be considered
that the pressure in the cuvette may be as much as 200 mbar below ambient
pressure (vacuum in the suction system).
3.2.8 Sensor heating (FET)
An insulated power FET which is screwed onto the cuvette is used for temperature
stabilization of the cuvette (setpoint temperature 58 °C). The drain source resistor of
the FET is controlled via a control voltage and is used as sensor heating. The current
that flows through the FET determines the heating output with the voltage drop across
the FET.
The setpoint of the temperature is specified by the MOPS software. The micro-
controller on the MOPS PCB control a digital potentiometer located on the AMO ILCA
PCB power module. Its output voltage is routed to the FET via an impedance
converter. The temperature is monitored by an NTC.
3.2.9 Memory for calibration data
All calibration data, serial numbers, and settings required to operate the sensor head
are stored in an EEPROM on the Base PCB in the sensor head.
3.3 Sensor head operation
The sensor head attains its full accuracy when it has reached its operating
temperature and a stable temperature distribution. The time from power-on until
ready-to-measure is determined by the duration of the warm-up phase. The warm-up
phase is dependent on the temperature distribution when the sensor is powered up.
The sensor software optimizes the starting behavior. In the worst case the sensor
head attains its specified accuracy no later than 4 minutes after power-on.
3.3.1 Self test
The sensor head software performs a self-test when the system starts up and
continuously during measurement operation. In the event of an error the sensor
software generates the relevant status message and shuts down the system if
necessary.
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