Datex-Ohmeda S-5 Service Manual M-COP
S/5
Datex-Ohmeda Cardiac Output Modules
TM
Cardiac Output and SvO2 Module, M-COPSv (Rev. 01)
TM
S/5
Cardiac Output Module, M-COP (Rev. 03)
Technical Reference Manual Slot
Datex-Ohmeda Inc.
3030 Ohmeda Drive
53707-7550 MADISON, WIS
USA
Tel. +1-608 -221 1551, Fax +1-608-222 9147
www.us.datex-ohmeda.com
All specifications are subject to change without notice.
Document No. 800 1012-1
June 2001
Datex-Ohmeda Division,
Instrumentarium Corp.
P.O. Box 900, FIN-00031
DATEX-OHMEDA, FINLAND
Tel. +358 10 394 11 Fax +358 9 146 3310
www.datex-ohmeda.com
Instrumentarium Corp. All rights reserved.
Table of contents
TABLE OF CONTENTS
Cardiac Output Modules, M-COP and M-COPSv
TABLE OF CONTENTS i
TABLE OF FIGURES ii
Introduction 1
1 Specifications 2
1.1 General specifications ..............................................................................................................................2
1.2 Typical performance .................................................................................................................................2
1.2.1 C.O..................................................................................................................................................2
1.2.2 SvO
1.2.3 InvBP...............................................................................................................................................2
1.3 Technical specifications............................................................................................................................3
2 Functional Description 4
2.1 Measurement principle .............................................................................................................................4
2.1.1 Cardiac output and REF....................................................................................................................4
2.1.2 SvO
2.1.3 Invasive blood pressure measurement ..............................................................................................6
2.2 Main components.....................................................................................................................................6
2.2.1 COP board........................................................................................................................................7
2.2.2 COPSv board..................................................................................................................................10
2.3 Connectors and signals...........................................................................................................................11
2.3.1 Module bus connector....................................................................................................................11
2.3.2 Front panel connectors...................................................................................................................12
................................................................................................................................................2
2
measurement ..........................................................................................................................5
2
3 Service Procedures 14
3.1 General service information.....................................................................................................................14
3.2 Service check .........................................................................................................................................15
3.2.1 Recommended tools ......................................................................................................................15
3.3 Disassembly and reassembly..................................................................................................................20
3.4 Adjustments and calibrations..................................................................................................................20
3.4.1 Cardiac output calibration...............................................................................................................20
3.4.2 Invasive pressure calibration...........................................................................................................20
4 Troubleshooting 22
4.1 Troubleshooting charts............................................................................................................................22
4.1.1 Cardiac Output...............................................................................................................................22
4.1.2 SvO
4.1.3 InvBP.............................................................................................................................................23
4.2 Troubleshooting flowchart .......................................................................................................................24
..............................................................................................................................................22
2
5Service Menu 25
5.1 COP Menu ..............................................................................................................................................26
5.1.1 COP calibration menu.....................................................................................................................28
6 Spare Parts 29
6.1 Spare parts list .......................................................................................................................................29
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Datex-Ohmeda S/5 monitors
6.1.1 Cardiac Output Module, M-COP Rev. 00.......................................................................................... 29
6.1.2 Cardiac Output Module, M-COP Rev. 01.......................................................................................... 29
6.1.3 Cardiac Output Module, M-COP Rev. 02.......................................................................................... 30
6.1.4 Cardiac Output Module, M-COP Rev. 03.......................................................................................... 30
6.1.5 Cardiac Output and SvO
6.1.6 Cardiac Output and SvO
Module, M-COPSv Rev. 00 .......................................................................30
2
Module, M-COPSv Rev. 01 .......................................................................31
2
6.1.7 Front panel stickers for AS/3 modules (square buttons)...................................................................31
6.1.8 Front panel stickers for S/5 modules (round buttons).......................................................................31
7 Earlier Revisions 32
APPENDIX A 33
Service check form A-1
TABLE OF FIGURES
Figure 1 Cardiac Output Module, M-COP, and Cardiac Output and SvO2 Module, M-COPSv ..................................1
Figure 2 Cardiac output measurement curve.......................................................................................................5
Figure 3 Front panels of Cardiac Output Modules, M-COP and M-COPSv.............................................................. 6
Figure 4 COPSv board block diagram, on COP board the SvO
section is excluded................................................ 8
2
Figure 5 Pressure transducer principle of operation.............................................................................................8
Figure 6 Serial communication and opto isolation............................................................................................... 9
Figure 7 Cardiac Output Module troubleshooting flowchart................................................................................24
Figure 8 Module box and Cardiac Output Module, M-COP .................................................................................29
Figure 9 Cardiac Output and SvO
Module, M-COPSv........................................................................................ 30
2
ii
Document No. 800 1012-1
INTRODUCTION
This section provides information for the maintenance and service of Cardiac Output Modules, MCOP and M-COPSv. Cardiac Output Modules, M-COP and M-COPSv are single width plug-in
modules designed for use with the S/5 monitors. Later in this manual modules can be called w/o
system name S/5.
Both modules provide
• Cardiac output (C.O.)
• Right ventricular ejection fraction (REF)
• Invasive blood pressure (InvBP) measurement
Cardiac Output Modules, M-COP and M-COPSv
Additionally, the COPSv module provides venous oxygen saturation (SvO
) measurement.
2
NOTE: Do not use identical modules in the same monitor simultaneously.These modules are
considered as identical and would cause communication errors if used in the same system.
Figure 1 Cardiac Output Module, M-COP, and Cardiac Output and SvO
COPSv
Document No. 8001012-1
Module, M-
2
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Datex-Ohmeda S/5 monitors
1 SPECIFICATIONS
1.1 General specifications
Module size (W × D × H) 37 × 180 × 112 mm / 1.5 × 7.1 × 4.4 in
Module weight 0.35 kg / 0.8 lbs
Power consumption, M-COP Approximately 3.5 W
Power consumption, M-COPSv Approximately 5 W
1.2 Typical performance
1.2.1 C.O.
Measurement range 0.1...20 l/min
Display resolution 0.01 l/min
Repeatability ±2 % or ±0.02 l/min whichever is greater
(measured from electrically generated flow curves)
1.2.2 SvO
2
1.2.3 InvBP
Max. change in blood temp 2.99 °C
Injectate temp range (with Edward's compatible probes)
0...25.5 °C ±0.3 °C
25.5...27.0 °C ±0.5 °C
Blood temp range (with Edward's compatible catheters)
17.5...30.9 °C ±0.5°C
31.0...43.0 °C ±0.3°C
Protection against electric shock type CF defibrillation proof
REF
Repeatability ±2 %
(Measuring range 10-60 %)
Accuracy ±2 %
(Measuring range 30-95 %)
Equal to standard deviation when using in-vivo calibration.
Measurement range -40...+320 mmHg
Zero adjustment range ±150 mmHg
Calibration range ±20 %
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Document No. 800 1012-1
Scales Upper limit is adjustable between 10 and 300
Sweep speed 12.5, 25, 50 mm/s
DIGITAL DISPLAY
Range -40...+320 mmHg
Resolution ±1 mmHg
WAVEFORM DISPLAY
Range -30...+300 mmHg
PULSE RATE
Measurement range 30...250 bpm
Resolution 1 bpm
Accuracy ±5 % or ±5 bpm whichever is greater
Respiration artifact rejection
1.3 Technical specifications
Cardiac Output Modules, M-COP and M-COPSv
mmHg in steps of 10. Lower limit is 10 % of selected
upper limit below zero.
The digital display is averaged over 5 seconds and updated at 5 second intervals.
Accuracy ±5 % or ±2 mmHg, whichever is greater
Transducer and 5 µV/V/mmHg, 5 VDC
input sensitivity 20 mA max current
Nonlinearity <1 %, 0 to 200 mmHg
<2 %, -40 to 0 and 200 to 320 mmHg
Filter 0...22 Hz (-3 dB),
adjustable upper limit 4...22 Hz
Zero set accuracy ±1 mmHg
Calibration resolution ±1 mmHg
Zero time < 15 sec
Protection against electric shock type CF defibrillation proof
NOTE: The accuracy of the measurement may be different from the specified accuracy, depending
on the transducer/probe used. Please check the transducer/probe specification.
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Datex-Ohmeda S/5 monitors
2 FUNCTIONAL DESCRIPTION
2.1 Measurement principle
2.1.1 Cardiac output and REF
Cardiac output measurement is made using the principle of thermodilution. During measurement
the catheter lies in the heart, with an injection port in the right atrium (RA) and a thermistor, which
is to monitor blood temperature, in the pulmonary artery (PA). A small, known amount of thermal
indicator is injected into the RA and is mixed with the blood on its way to the PA. The catheter
thermistor measures the decrease in blood temperature as the blood flows past the thermistor in
the PA.
The information is stored in the module and the cardiac output is calculated from the area beneath
the time-temperature Cardiac Output Measurement Curve, as shown in figure 2.
The area under the time-temperature curve is inversely proportional to the flow rate which
corresponds to cardiac output.
The cardiac output is calculated from the equation:
C.O.= (1.08 C
60 Vi(TB-Ti))/(TBdt + C)
T
where:
C.O. = cardiac output in liters/minute
1.08 = factor comparing the density and specific heat of 5% dextrose solution in water to
those of blood.
= correction factor for the injectate temperature rise as it passes through the
C
T
catheter and its dead space
60 = seconds/minute
= injectate volume in liters
V
i
= baseline blood temperature (°C)
T
B
Ti = injectate temperature
dt = area under time-temperature curve between time o and x, where x is the
T
B
time when the curve has dropped to 30% of its peak value.
C = area beneath time-temperature curve between x and the end of the
curve.
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Document No. 800 1012-1
Cardiac Output Modules, M-COP and M-COPSv
%
-T
area A
100%
80%
start of meas.
end of meas.
area C
30%
0%
Temperature change in blood [
m.s.
80% 30%
Time
Figure 2 Cardiac output measurement curve
A = area derived by integration of the time-temperature curve
C = area beneath the time-temperature curve between t
based on an exponential fit to the curve between t
% and end of the curve. Computation
30
% of the peak and t30%.
80
REF (right ventricular ejection fraction) measurement is a part of the time-temperature
(thermodilution) cardiac output measurement. Ejection fraction is determined using an exponential
technique by synchronizing sensed R-waves with points of temperature changes on the timetemperature curve. Once ejection fraction, cardiac output, and heart rate are known, right
ventricular volumes may be calculated. The measurement requires a Baxter-Edwards fast response
thermistor catheter and an ECG module to synchronize R-wave detection to the time-temperature
curves.
t
2.1.2 SvO2 measurement
The COPSv module measures SvO2 when coupled with a Baxter-Edwards OM-2E optical module
and a Swan-Ganz oximetry catheter. To measure SvO
technique involving the use of light emitting diodes (LEDs) that produce red (660 nm) and infrared
(810 nm) light. The light is transmitted to the blood through a single plastic optical fiber in the
oximetry catheter and reflected back through a separate optical fiber to a photodetector in the
optical module. The light is electrically transmitted to the COPSv module and analyzed to
determine SvO
The oximetry portion of the system measures SvO
changes in the red blood cells. When pulses of red and infrared light are transmitted through the
oximetry catheter, the light is reflected from the red blood cells and transmitted back through the
catheter to the optical module. The amount of light reflected at each wavelength depends primarily
on the color of the blood and the number of red blood cells. Since the number of red blood cells in
the blood affects the amount of reflected light, the differences are compensated for when the
patient’s total hemoglobin value is entered. The optical module stores and transfers SvO
calibration data. SvO2 values can be affected by the presence of methemeglobin or
carboxyhemoglobin which imitate the absorption characteristics of HbO
methemeglobin or carboxyhemoglobin could then cause a falsely elevated SvO
dysfunctional hemoglobins are suspected, SvO
, the system utilizes a spectrophotometric
2
.
2
in the pulmonary artery by detecting color
2
2
. Large concentrations of
2
. In cases where
2
should be interpreted with caution.
2
5
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Datex-Ohmeda S/5 monitors
2.1.3 Invasive blood pressure measurement
To measure invasive blood pressure, a catheter is inserted into an artery or vein. The invasive
pressure setup, consisting of connecting tubing, pressure transducer, an intravenous bag of normal
saline all connected together by stopcocks, is attached to the catheter. The pressure transducer is
placed at the same level with the heart, and electrically zeroed.
The pressure transducer is a piezo-resistive device that converts the pressure signal to a voltage.
The monitor interprets the voltage signal so that blood pressure data and blood pressure
waveforms can be displayed.
2.2 Main components
The Cardiac Output Module, M-COP consist of a COP circuit board and two input boards - a CO
input board and a P input board, attached to the front panel.
The Cardiac Output and SvO
boards - a CO input board, a SvO
Module, M-COPSv, consist of a COPSv circuit board and three input
2
input board and a P input board, attached to the front panel.
2
The front panels are shown in figure 3.
M-COP
1
P
4
C.O.
2
3
4
5
M-COPSv
P4
SvO
2
C.O
.
6
Figure 3 Front panels of Cardiac Output Modules, M-COP and M-COPSv
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Document No. 800 1012-1
(1) Key for pressure zeroing (Zero P4)
(2) Key for cardiac output measurement (Start C.O.)
(3) Connector for invasive blood pressure measurement
(4) Connector for C.O. self test
(5) Connector for C.O. measurement
(6) Connector for SvO
measurement
2
2.2.1 COP board
The COP board consists of the following functional sections.
• Processor
• Cardiac output measurement
• Cardiac output self test
• Invasive blood pressure measurement
• Serial communication
• Isolation
• Power supply
Processor section
The microprocessor uses the Intel 80C196KC-16 CPU which includes three A/D converters and a
UART. The microprocessor uses external memories, an 8-bit data bus, a 16 MHz oscillator, and a
watchdog timer. The three A/D-converters within the CPU convert the analog input signals to
digital. The internal UART communicates and transfers data between the module and the CPU
board in the monitor.
Cardiac Output Modules, M-COP and M-COPSv
Cardiac output measurement section
The catheter and the probe contain an NTC resistor that reacts to temperature change.
The temperature dependent voltage across the NTC resistor is amplified and an offset value is
added to it. The resultant signal is then regulated into a
A/D converter.
Because the temperature measurements are calibrated digitally and non-linearity of
catheter/probe is compensated by software, ambient temperature change after calibration is the
only factor that may influence the measurement.
Cardiac output self test
The Cardiac Output Module, M-COP contains a C.O. Self Test connector.
When the cable is connected to the C.O. Self Test connector, the microprocessor starts the test
program automatically. First, the microprocessor measures 30 °C, then it activates test circuits
and measures 37 °C and 41 °C.
If the values are not correct ‘Cable fault’ is displayed and there is a fault is either in the module or in
the catheter connecting cable.
±5 V range by voltage slicing and sent to an
Document No. 8001012-1
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Datex-Ohmeda S/5 monitors
Modul e
data
RS485
DRIVER
FOR
DATA
OPTO
ISOLATION
NON-
VOLAT ILE
MEMOR Y
SvO2 AD
OM-2 control
To opti cal module
Module bus data
SvO2
MEAS URI NG
UNI T
Modul e
reset
RS485
DRIV ER
FOR
MODU LE
RESET
Res et
Serial device
communicati on
Power f or
communication
POWER
RESET
PATIENT ISOLATION
MIC ROPROC ESSOR
RAM internal 256
external 16K
EPROM 48K
RS COMMUNICATI ON
ADCONVERTER
8 chn
12 bit
C.O.
control
C.O.
AD
C.O.
MEASURI NG
UNIT
Press AD
P4 INV
PRESSURE
MEASURING
UNIT
Power f or
module
POWER
NONISOLATION
SECTION
ISOLATION
TRANS-
FORMER
POWER
ISOLATION
SECTION
FRONT
PANEL
KEYS
Figure 4 COPSv board block diagram, on COP board the SvO2 section is excluded
Invasive blood pressure measurement section
Uin
Figure 5 Pressure transducer principle of operation
An isolated +5 V supply is connected to the input of the pressure transducer bridge circuit. From
the bridge circuit output a differential voltage, which depends on blood pressure and input supply
voltage, is calculated using the following formula:
Pressure
transducer
Uout
Input
Filter
Instrumentation
amplifier
G
to AD converter
8
Document No. 800 1012-1
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