GE Cardiocap 5 Service Manual

							
Frames and Software 
5.6 Display, input, and output 
5.6.1 Display 
 
NOTE: The LCD display backlight circuit runs on high voltage. Do not touch the inverter board 
when powered. 
The display consists of 10.4 inch TFT LCD display unit, backlight board, and inverter board.  
The CPU board drives the display. The picture data, synchronization, and +5 V supply voltage are 
connected from the CPU board to the display unit via the display adapter board. 
The +12 V supply voltage connects to the backlight board and inverter board via the CPU board. The 
CPU controls the display brightness with three data bits, which adjust the backlight lamp current. The 
brightness data is converted to adjusting voltage on the backlight board, which controls the inverter 
board output and the brightness of the backlight lamps. The backlight lamps are cold cathode lamps. 
 
Figure 5-10. Cardiocap/5 display block diagram 
5.6.2 Keyboard board 
This board contains seven direct-function switches, red and yellow alarm LEDs, a green power 
indicator LED, and a standby switch. The standby switch is connected to the CPU and to the DC/DC 
board. The wire to the DC/DC board is linked through the CPU.  
The power indicator LED on the board is lit constantly when VDD is available. It flashes when battery 
charging is active. It is connected directly to the DC/DC board. 
5.6.3 Mother board 
The main function of the Mother board is to connect the measuring units to the CPU and to link the 
supply voltages for them. 
The 2.6Ah 12V back-up battery connects to the DC/DC board through the Mother board. The board 
contains a 10A fuse in series with the battery cable and a protection diode.  
Two D25 connectors connect the airway gas and hemodynamic parameter units to the module bus. 
The 26-pin flat cable connector is used for expansion options. A 10-pin flat cable connector connects 
the module bus to the CPU board. The Mother board also provides supply voltages to the I/O board 
through the 16-pin Molex connector. 
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Cardiocap/5 Technical Reference Manual 
5.6.4 I/O board 
The I/O board contains four different I/O connectors: 
• 44-pin female D connector for digital/analog output. 
• 9-pin male D connector for RS-232 serial I/O. 
• 9-pin female D connector for connecting NET ID plug. 
• 5-pin 180 DIN connector for connecting RemCo keyboard. 
Data from the CPU is connected through a 40-pin flat cable connector. Power from the Mother board is 
connected through a 16-pin flat cable connector. 
The NET function indicator LEDs are located on the board. 
The audio amplifier is on the board. 
A 4-channel D/A converter feeds four analog outputs. 
A +5 V regulator for supplying auxiliary devices is connected to the output connector. +5 V is regulated 
from +15 VD. 
Serial buffers convert the serial TTL data coming from the CPU to RS-232 and vice versa. 
A relay connected to the analog/digital output connector (pins 11 and 12) provides a floating nurse-
call signal. The digital nurse call signal coming from the CPU is on pin 5. 
5.6.5 Net board 
The Net board is just an adapter. The NET connector is attached on the board. 
5.6.6 Parameter connector boards 
Connector board Function 
Temp connector board 6.3 mm temp plug connector. Connection to the STP board. 
InvBP connector board (option) BP connectors and EMC filtering. Connection to the STP board. Two 
different shape of boards depending if there are gases or not. 
SpO2 connector board SpO2 connector and EMC filtering. Connection to the STP board.  
ECG connector board ECG connector, defibrillation-protection resistors, and discharge lamps. 
 
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Frames and Software 
5.7 Recorder and recorder board (N-XREC option) 
You can use the optional built-in recorder to do the following:  
• Record the graphical or numerical trend and print up to 24 hours of trend data. 
• Record up to three real-time waveforms simultaneously. 
• Display recordings of numerical information in horizontal and vertical plane.  
NOTE:  Thermal paper printouts may be destroyed when exposed to light, heat, alcohol, etc. Make a 
photocopy for your archives. 
 
Figure 5-11. Built-in recorder 
NOTE:  The two-button recorder (shown) is for Cardiocap/5 monitors using software version 3.0 or 
higher. A one-button recorder was available previously. 
(1) Record Waveform/Stop key. Press to start or stop recording selected real-time waveforms. This 
key functions like the Record Start/Stop key on a one-button recorder. 
(2) Record Trend/Stop key. Press to start or stop recording the selected graphical or numerical trend 
data. Since this key is not available on a one-button recorder, use the options in the Record 
Trends menu (Main Menu – Record/Print – Record Trends) to print trend data. 
(3) Key to release and open the recorder paper compartment 
(4) Recorder paper 
(5) Recorder paper compartment 
When the Record Trend/Stop key or the Record Waveform/Stop key on the recorder is pressed, the 
command to start or stop recording is transferred to the CPU through the serial bus. 
The recorder board links supply voltages from the DC/DC board and data from the CPU board to the 
recorder. A FET circuit delays the rise. A choke and a 10,000 µF capacitor filter the 12 V voltage. The 
delay limits the current peaks from the power supply. 
Communication with the main CPU board takes place through +5 V CMOS-level RS232 serial 
interface. The recorder supply voltage of +12 VREC is switched on after +5 V is present. 
Reset from the CPU bus is transferred to the recorder board. 
 
 
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Cardiocap/5 Technical Reference Manual 
 
 
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Contents 
Chapter 6. Measurement Parameters  
6.1 Introduction........................................................................\
.6-1 
6.1.1 Hemodynamic parameters and related options.............................................6-1 
6.1.2 Airway gases and associated options...........................................................6-2 
6.2 Measurement principles for hemodynamic parameters...........6-3 
6.2.1 NIBP........................................................................\
..................................6-3 
6.2.2 ECG........................................................................\
...................................6-3 
6.2.3 Impedance respiration........................................................................\
........6-3 
6.2.4 Temperature........................................................................\
.......................6-3 
6.2.5 Invasive blood pressure (N-XP option)..........................................................6-4 
6.2.6 Pulse oximetry, standard........................................................................\
.....6-4 
Plethysmographic pulse wave......................................................................6-5 
Sensor........................................................................\
...............................6-5 
Pulse rate........................................................................\
...........................6-5 
6.2.7 Pulse oximetry, Datex-Ohmeda enhanced (N-XOSAT option)...........................6-5 
Calibration........................................................................\
.........................6-6 
6.2.8 Pulse oximetry, Nellcor compatible (N-XNSAT option)....................................6-7 
6.3 Measurement principles for airway gases, spirometry,  
and NMT........................................................................\
......6-8 
6.3.1 CO2, N2O, and agent measurement..............................................................6-8 
6.3.2 O2 measurement........................................................................\
................6-9 
6.3.3 Patient spirometry measurement...............................................................6-10 
Airway pressure........................................................................\
................6-10 
Airway flow........................................................................\
.......................6-10 
Compliance and airway resistance.............................................................6-11 
D-liteTM flow sensor........................................................................\
............6-11 
6.3.4 NeuroMuscular Transmission (NMT) measurement......................................6-12 
Nerve stimulation........................................................................\
..............6-12 
Tetanic/Post-Tetanic Count (PTC)...............................................................6-12 
Response........................................................................\
.........................6-12 
Regional block........................................................................\
..................6-13 
6.4 Components for NESTPR hemodynamic parameters..............6-14 
6.4.1 Serial communication........................................................................\
.......6-14 
6.4.2 NIBP board.......................................................................\
........................6-15 
Pressure transducers........................................................................\
.........6-15 
Signal processing........................................................................\
..............6-15 
Software control........................................................................\
................6-16 
Memory........................................................................\
............................6-16 
Watchdog timer........................................................................\
................6-16 
Valves........................................................................\
..............................6-16 
Power supply section........................................................................\
.........6-16 
6.4.3 ECG board........................................................................\
........................6-17 
Analog ECG section........................................................................\
...........6-18 
  
						

							
Cardiocap/5 Technical Reference Manual 
ECG filtering ........................................................................\
...................... 6-18 
Respiration section........................................................................\
............ 6-18 
Microprocessor  section ........................................................................\
...... 6-19 
Isolated section.......................................................................\
.................. 6-19 
Power supply section ........................................................................\
......... 6-19 
6.4.4 STP board........................................................................\
......................... 6-20 
Microprocessor  unit ........................................................................\
........... 6-20 
6.4.5 STP board—Pulse oximetry  measurement section ........................................ 6-21 
6.4.6 STP board—Temperature me asurement section ........................................... 6-22 
6.4.7 STP board—Invasive blood pressu re measurement section ........................... 6-23 
6.5 N-XOSAT or N-XNSAT optional pul se oximetry components ..... 6-24 
6.5.1 Datex-Ohmeda enhanced pulse oximetry components (N-XOSAT option) ....... 6-24 
Serial communications connector............................................................... 6-24 
Sensor interface connector ........................................................................\
 6-24 
6.5.2 Nellcor pulse oximetry components (N-XNSAT  option) .................................. 6-25 
Communication protocol jumper ................................................................ 6-25 
6.5.3 SpO2 interface board (for N-XOSA T or N-XNSAT option) ................................ 6-26 
RS485 drivers ........................................................................\
................... 6-26 
Power supply, non-isolated section............................................................. 6-26 
Power supply, isolat ed section ................................................................... 6-26 
Opto isolation ........................................................................\
................... 6-27 
Microprocessor, UART, no nvolatile memory ................................................. 6-27 
Module bus connector........................................................................\
....... 6-27 
Test connector ........................................................................\
.................. 6-27 
6.6 Airway gases and spirom etry components............................. 6-28 
6.6.1 Gas sampling system ........................................................................\
........ 6-28 
6.6.2 TPX measuring unit ........................................................................\
............ 6-31 
6.6.3 OM measuring unit  and board .................................................................... 6-31 
OM board ........................................................................\
......................... 6-31 
6.6.4 PVX measuring unit and board (Patie nt Spirometry, N-XV option) .................. 6-32 
PVX board ........................................................................\
......................... 6-32 
6.6.5 Gas unit CPU board ........................................................................\
........... 6-32 
6.7 NMT components..........................................................\
...... 6-34 
6.7.1 NMT board........................................................................\
........................ 6-34 
Serial communication........................................................................\
........ 6-34 
Stimulator........................................................................\
......................... 6-34 
6.7.2 Front panel connect or (NMT) ...................................................................... 6-35 
6.7.3 Module bus connector ........................................................................\
....... 6-35 
  
						

							
Contents 
Table of Figures 
Figure 6-1. Hemodynamic parameters measurement unit (NESTPR)....................................6-1 
Figure 6-2. Airway gases measurement unit......................................................................6-2 
Figure 6-3. Absorption of infrared light in the finger............................................................6-4 
Figure 6-4. Comparative light absorption........................................................................\
..6-6 
Figure 6-5. Extinction versus wavelength graph..................................................................6-6 
Figure 6-6. TPX sensor principle........................................................................\
................6-8 
Figure 6-7. Absorbance of N2O and CO2........................................................................\
....6-8 
Figure 6-8. Infrared absorbance of AAs........................................................................\
.....6-9 
Figure 6-9. O2 measurement principle........................................................................\
......6-9 
Figure 6-10. Principle of response measurement.............................................................6-12 
Figure 6-11. Serial communication and opto isolation.....................................................6-14 
Figure 6-12. NIBP board functional block diagram...........................................................6-15 
Figure 6-13. ECG board block diagram........................................................................\
...6-17 
Figure 6-14. STP board block diagram........................................................................\
....6-20 
Figure 6-15. Pulse oximetry measurement block diagram.................................................6-21 
Figure 6-16. Temperature measurement principle...........................................................6-22 
Figure 6-17. Pressure measurement principle.................................................................6-23 
Figure 6-18. SpO2 interface board block diagram............................................................6-26 
Figure 6-19. Gas sampling system (N-XC option).............................................................6-28 
Figure 6-20. Gas sampling system (N-XCO and N-XCAiO options)......................................6-29 
Figure 6-21. Gas tubing layout........................................................................\
...............6-30 
Figure 6-22. TPX measuring unit........................................................................\
.............6-31 
Figure 6-23. OM measuring unit........................................................................\
.............6-31 
Figure 6-24. PVX measuring unit........................................................................\
............6-32 
Figure 6-25. Signal processing........................................................................\
...............6-33 
Figure 6-26. Control logic........................................................................\
......................6-33 
Figure 6-27. Calibration data stored in EEPROM..............................................................6-33 
Figure 6-28. NMT serial communication and opto isolation..............................................6-34 
Figure 6-29. NMT stimulator block diagram.....................................................................6-34 
 
 
  
						

							
Measurement Parameters 
6. MEASUREMENT PARAMETERS 
6.1 Introduction 
This chapter provides information about the Cardiocap/5 standard measurement features and all 
measurement options.  
6.1.1 Hemodynamic parameters and related options 
The Cardiocap/5 Parameter unit (NESTPR) provides measurement of general hemodynamic 
parameters.  
 
Figure 6-1. Hemodynamic parameters measurement unit (NESTPR) 
NESTPR represents the measurement parameters listed below: 
N = Non-invasive blood pressure (NIBP) 
E = ECG 
S = Pulse oximetry (oxygen saturation and pulse rate) 
T = Temperature (T1) 
P = Invasive blood pressure (N-XP option)—two channels (P1, P2) and a second temperature (T2) 
R = Impedance respiration 
The pulse oximetry options listed below require hardware and processing that is not part of the 
NESTPR unit: 
• Datex-Ohmeda enhanced pulse oximetry (N-XOSAT option). 
• Nellcor® compatible pulse oximetry (N-XNSAT option). 
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Cardiocap/5 Technical Reference Manual 
6.1.2 Airway gases and associated options 
The Cardiocap/5 Airway Gas options (N-XC, N-XCO, N-XCAiO) provide airway and respiratory 
measurements through the airway gas measurement unit.  
 
Figure 6-2. Airway gases measurement unit 
The features of each option are noted in the chart below. 
NOTE:  One or more of the airway gas options is required for the Patient Spirometry (N-XV) and 
NeuroMuscular Transmission (N-XNMT) options.  
 
Option 
 
CO2
 
N2O 
 
O2
Anesthetic 
Agents 
Anesthetic 
Agent id 
Patient 
Spirometry 
NeuroMuscular 
Transmission 
N-XC •       
N-XCO • • •     
N-XCAiO • • • • •   
N-XV *      •  
N-XNMT **       • 
* Requires N-XCO or N-XCAiO. 
** Requires N-XCAiO. 
6-2