S5 Hemodynamic Modules Technical Reference Manual Slot April 2004

Table of contents

TABLE OF CONTENTS S/5 Hemodynamic Modules TABLE OF CONTENTS

i

TABLE OF FIGURES

iii

Introduction

1

1

3

Specifications 1.1 1.2

General specifications ... 3 Typical performance ... 3 1.2.1 NIBP ... 3 1.2.2 ECG... 3 1.2.3 Pulse oximetry ... 4 1.2.4 Temperature ... 4 1.2.5 Invasive blood pressure... 5 1.2.6 Respiration... 5 1.3 Technical specifications... 6 1.3.1 NIBP ... 6 1.3.2 ECG... 6 1.3.3 Pulse oximetry ... 6 1.3.4 Temperature ... 7 1.3.5 Invasive blood pressure... 7 1.3.6 Respiration... 7

2

Functional Description

8

2.1

Measurement principle... 8 2.1.1 NIBP ... 8 2.1.2 ECG... 8 2.1.3 Pulse oximetry ... 8 2.1.4 Temperature ... 10 2.1.5 Invasive blood pressure... 10 2.1.6 Respiration... 10 2.2 Main components ... 11 2.2.1 M-PRESTN/-RESTN/-PRETN modules ... 11 2.2.2 NIBP board... 12 2.2.3 ECG board in 12-lead measurement ... 15 2.2.4 ECG filtering... 17 2.2.5 STP board... 18 2.3 Connectors and signals ... 23 2.3.1 Module bus connector (on the NIBP board) ... 23 2.3.2 Front panel connectors... 25 2.3.3 Test points on boards ... 26

3

Service Procedures

29

3.1 3.2

General service information ... 29 Service check... 29 3.2.1 Recommended tools... 29 3.2.2 Recommended parts... 29 3.3 Disassembly and reassembly... 39 3.3.1 M-PRESTN/-RESTN/-PRETN modules ... 39 3.4 Adjustments and calibrations ... 40 i Document No. 8005571-1

Datex-Ohmeda S/5 monitors 3.4.1 3.4.2 3.4.3

4

NIBP calibrations... 40 Temperature calibration ... 42 Invasive pressure calibration ... 42

Troubleshooting

43

4.1

Troubleshooting charts ... 43 4.1.1 NIBP ... 43 4.1.2 NIBP error code explanation ... 46 4.1.3 ECG ... 47 4.1.4 Pulse oximetry (SpO2) ... 47 4.1.5 Temperature... 48 4.1.6 Invasive blood pressure ... 49 4.1.7 Impedance respiration... 50 4.2 Troubleshooting flowcharts ... 51 4.2.1 M-PRESTN module troubleshooting for NIBP parameter... 51 4.2.2 M-PRESTN module troubleshooting for parameters ESTPR ... 52

5

Service Menu

53

5.1

NIBP service menu ... 54 5.1.2 NIBP demo menu... 55 5.1.3 NIBP calibration menu ... 56 5.1.4 NIBP safety valve menu... 57 5.1.5 NIBP pulse valve menu ... 58 5.1.6 NIBP buttons/leds menu... 59 5.1.7 NIBP pneumatics menu ... 60 5.1.8 NIBP watchdog menu... 61 5.1.9 ECG service menu... 62 5.1.10 ECG setup menu... 64 5.2 STP service menu... 65 5.2.2 STP calibration menu ... 67

6

Spare Parts 6.1

7

68

Spare parts list... 68 6.1.1 M-PRESTN rev. 01, M-RESTN rev. 01, M-PRETN rev. 01 ... 68

Earlier Revisions

71

APPENDIX A

73

Service Check Form

1

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Table of contents

TABLE OF FIGURES Figure 1

S/5 PRESTN Module, M-PRESTN... 1

Figure 2

Absorption of infrared light in the finger probe parts layout and schematic diagram ... 9

Figure 3

Front panel of M-PRESTN... 11

Figure 4

NIBP board functional block diagram ... 12

Figure 5

NIBP pneumatics diagram ... 14

Figure 6

12-lead ECG measurement block diagram ...15

Figure 7

STP board block diagram ... 18

Figure 8

Temperature measurement principle ... 19

Figure 9

Pressure measurement principle... 20

Figure 10

Pulse oximetry measurement block diagram... 21

Figure 11

Serial communication of NIBP board... 22

Figure 12

Serial Communication and Isolation of STP board... 22

Figure 13

Serial Communication and Isolation of ECG board ... 22

Figure 14

Module bus connector (X1) pin layout ... 23

Figure 15

ECG board connectors and test points... 26

Figure 16

NIBP board connectors and test points... 27

Figure 17

STP board connectors and test points ... 28

Figure 18

M-PRESTN module troubleshooting flowchart for NIBP Parameter... 51

Figure 19

M-PRESTN Module Troubleshooting Flowchart for Parameters ESTPR... 52

Figure 20

Exploded view of M-PRESTN Module ... 68

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iv Document No. 8005571-1

S/5 M-PRESTN Modules

INTRODUCTION This Technical Reference Manual Slot provides information for the maintenance and service of the hemodynamic modules S/5 M-PRESTN/-RESTN/-PRETN. The modules are double width modules designed for use with S/5 monitors. Later in this manual modules may be referred to w/o the system name S/5 for simplicity. Please also refer to Technical Reference Manual of the S/5 monitor for information regarding system specific information e.g. related documentation, conventions used, symbols on equipment, safety precautions, system description, system installation, interfacing, functional check and planned maintenance. The M-PRESTN/-RESTN/-PRETN modules provide general hemodynamic parameters. Auto On/Off

Start Cancel

Zero P1

Zero P2

SpO2

NIBP

ECG

T1

P1

T2

P2

NOTE: Do not use identical modules in the same monitor simultaneously. The following modules are considered identical: M-ESTP/-EST/-ETP, M-ESTPR/-ESTR/-ETPR, M-NESTPR/-NESTR/-NETPR, M-NE12STPR/-NE12STR/-NE12TPR M-PRESTN/M-RESTN/M-PRETN

Figure 1

S/5 PRESTN Module, M-PRESTN

Table 1

Options of S/5 hemodynamic modules Parameter

PRESTN

RESTN

PRETN

P

Two invasive blood pressures

•

•

R

Impedance respiration

•

•

•

E

ECG

•

•

•

S

Pulse oximetry

•

•

T

Two temperatures

•

•

•

N

NIBP

•

•

•

NOTE: 12-lead ECG measurement requires Display Controller, B-DISP or B-DISPX. Intended purpose (Indications for use) The Datex-Ohmeda PRESTN module (model family M-PRESTN) and accessories are indicated for monitoring of hemodynamic parameters of all hospital patients. The hemodynamic parameters of the module comprise ECG including ST-segment and arrhythmia, Impedance respiration, NIBP, Temperature,SpO2 (including monitoring during conditions of clinical patient motion),and invasive blood pressure. 1 Document No. 8005571-1

Datex-Ohmeda S/5 monitors Impedance respiration measurement is indicated for patients aged 3 and up. The NIBP measurement is indicated for patients who weigh 5kg (11 lb.) and up. This device is indicated for use by qualified medical personnel only. Monitor software compatibility Datex-Ohmeda PRESTN rev. 01 module is designed for use with Datex-Ohmeda monitors using software as follows: AM: L-ANE01(A) or later versions; CCM: S-00C01 rev. 10.5, S-00C02 rev. 10.5 or newer versions; CAM: S-00A05 rev. 10.9, S-00A06 rev. 10.9, L-00A07 rev. 10.9, L-00A08 rev. 10.9 or newer versions and CCCM: S-00C03 rev. 10.9, S-00C04 rev. 10.9 or newer versions.

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1

SPECIFICATIONS

1.1 General specifications Module size W×D×H Module weight Power consumption Operation temperature

75 × 180 × 112 mm 3.0 × 7.1 × 4.4 in 0.7 kg / 1.5 lbs about 6 W 10 to 40 °C / 50 to 104 °F

1.2 Typical performance 1.2.1 NIBP NOTE: Non-invasive blood pressure measurement is intended for patients weighing over 5 kg (11 lb.) Oscillometric measurement principle. Measurement range

adult child infant

25 to 260 mmHg 25 to 195 mmHg 15 to 145 mmHg

Pulse rate range accepted

30 to 250 bpm

Measurement interval

STAT (continuous 5 min), 1, 2.5, 3, 5, 10, 15, 30 and 60 min (1 h), 2 and 4 h

Typical measuring time

adult infant

23 s 20 s

Initial inflation pressure

adult child infant

170 ±10 mmHg 150 ±10 mmHg 120 ±10 mmHg

Venous stasis

adult child infant

40 ±5 mmHg / 2 min 40 ±5 mmHg / 2 min 30 ±5 mmHg / 1 min

Cuff widths

please see User’s Guide

1.2.2 ECG Lead selection, 12-lead ECG Lead selection, other modules Sweep speeds DISPLAY FILTER Diagnostic, 12-lead ECG Diagnostic, other modules Monitoring

I, II, III, aVR, aVL, aVF, V1, V2, V3, V4, V5, V6 I, II, III, aVR, aVL, aVF, V 12.5, 25, 50 mm/sec 0.05 to 150 Hz 0.05 to 100 Hz 0.5 to 30 Hz (-3 dB, with 50 Hz reject filter) 0.5 to 40 Hz (-3 dB, with 60 Hz reject filter) 3 Document No. 8005571-1

Datex-Ohmeda S/5 monitors ST filter HEART RATE FROM ECG Range Accuracy Resolution Update interval Averaging time

0.05 to 30 Hz (-3 dB, with 50 Hz reject filter) 0.05 to 40 Hz (-3 dB, with 60 Hz reject filter) 30 to 250 bpm ±5 bpm or ±5 %, whichever is greater 1 bpm 5s 10 s

ST LEVELS (in main software) ST level range -9 to +9 mm (-0.9 to +0.9 mV) Resolution 0.1 mm (0.01 mV) Averaging calculated from 8 QRS SYNCHRONIZATION Direct ECG Pacer Defibrillator

analog output of ECG, 1 V/1 mV 5 V and 0.5 to 2.5 ms pulse, < 30 ms after pacer peak 5 V and 10 ms pulse, < 35 ms after R-point synchronization

1.2.3 Pulse oximetry Measurement range Calibration range

0 to 100 % 70 to 100 %

Accuracy1

100 to 70 %, ±2 digits ±3 digits during clinical patient motion 69 to 0 %, unspecified

Display resolution Display averaging time Pulse beep pitch

1 digit = 1 % of SpO2 20, 10 sec, beat-to-beat varies with SpO2 level

The monitor is calibrated against functional oxygen saturation SpO2 func. PULSE RATE FROM PLETH Measurement range Accuracy Resolution Display averaging

30 to 250 bpm 30 to 100, ±5 bpm, 100 to 250, ±5 % 1 bpm 10 s

Adjustable pulse beep volume. PLETH WAVEFORM Scales

2, 5, 10, 20, 50 mod%, Auto

Start up scale is 20 mod% if AUTO is not selected to be the default setting.

1.2.4 Temperature Measurement range Measurement accuracy

10 to 45 °C (50 to 113 °F) ±0.1 °C (25 to 45.0 °C)

1 Accuracy is based on deep hypoxia studies with volunteered subjects during motion and non-motion conditions over a wide range of arterial

blood oxygen saturations as compared to arterial blood CO-Oximetry.

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Display resolution Temperature test Probe type Single use sensors

±0.2 °C (10 to 24.9 °C) 0.1 °C (0.1 °F) automatic (every 10 min) compatible with YSI 400 series ±0.2 °C (25 to 45.0 °C) ±0.3 °C (10 to 24.9 °C)

1.2.5 Invasive blood pressure Measurement range Measurement accuracy Zero adjustment range Calibration range Scales

-40 to 320 mmHg ±2 mmHg or ±5 % ±150 mmHg ±20 % upper limit is adjustable between 10 and 300 mmHg in steps of 10. Lower limit is 10 % of selected upper limit below zero.

Sweep speed

12.5, 25, 50 mm/s

DIGITAL DISPLAY Range Resolution

-40 to 320 mmHg ±1 mmHg

WAVEFORM DISPLAY Range

-30 to 300 mmHg

PULSE RATE FROM ARTERIAL PRESSURE Measurement range 30 to 250 bpm Resolution 1 bpm Accuracy ±5 bpm or ±5 % whichever is greater

1.2.6 Respiration NOTE: The respiration measurement is intended for patients over three years old Measurement range Accuracy Resolution Averaging time Update interval

4 to 120 bpm ±5 bpm or ±5 % 1 bpm 30 s 10 s

RESPIRATION WAVEFORM Sweep Speeds

6.25 mm/s and 0.625 mm/s

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1.3 Technical specifications 1.3.1 NIBP Deflation rate, PR dep. Inflation time

3 to 8 mmHg/s 20 to 185 mmHg, 1 to 5 s

Automatic software control, max. inflation pressure adult 280 ±10 mmHg child 200 ±10 mmHg infant 145 ±5 mmHg Over pressure limit, stops measurement after 2 seconds adult 320 mmHg child 220 mmHg infant 160 mmHg The safety circuit limits the maximum cuff pressure to 320 mmHg in adult/child mode or 160 mmHg in infant mode. Independent timing circuit limits pressurizing (>15 mmHg) time to 3 minutes maximum in adult/child mode, and 90 seconds at (>5mmHg ) in infant mode. Zeroing to ambient pressure is done automatically. Inflation pressure is adjusted according to the previous systolic pressure, typically 40 mmHg above. If the systolic pressure is not found, inflation pressure is increased typically 50 mmHg. Max. measurement time

adult child infant

120 s 120 s 75 s

Pressure transducer accuracy is better than ±3 mmHg or ±2 % whichever is greater. Max. error ±4 mmHg. Protection against electrical shock

Type BF defibrillation proof

Defibrillation protection Recovery time Input impedance CMRR System noise Allowable offset Gain range Pacemaker pulse detection

5000 V, 360 J 5s >2.5 MΩ (10 Hz) ≥95 dB (ST) <30 µV (p-p, RTI) ±800 mVDC 0.2 to 5.0 cm/mV 2 to 700 mV, 0.5 to 2 ms pulses

Protection against electrical shock

Type CF defibrillator proof

1.3.2 ECG

1.3.3 Pulse oximetry Protection against electrical shock

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Type BF defibrillation proof

S/5 M-PRESTN Modules

1.3.4 Temperature Measurement accuracy Protection against electrical shock

±0.1 °C (25.0 to 45.0 °C) ±0.2 °C (10.0 to 24.9 °C) Type CF defibrillation proof

NOTE: The accuracy of the measurement may be different from the specified, depending on transducer/probe used. Please refer to the transducer/probe specification.

1.3.5 Invasive blood pressure DIGITAL DISPLAY AVERAGING Digital displays Art and P1 are averaged over 5 seconds and updated at 5 seconds intervals. All other pressures have respiration artifact rejection. Accuracy ±5 % or ±2 mmHg, whichever is greater Transducer and input sensitivity 5 µV/V/mmHg, 5 VDC, 20 mA max current Filter 0 to 4 - 22 Hz adjustable Zero set accuracy ±1 mmHg Calibration resolution ±1 mmHg Zero time less than 15 s Protection against electrical shock Type CF defibrillation proof NOTE: The accuracy of the measurement may be different from the specified, depending on transducer/probe used. Please refer to the transducer/probe specification.

1.3.6 Respiration Excitation frequency, 12-lead ECG

31.25 kHz

Breath detection

automatic, range 0.3 to 6 Ω manually adjustable minimum detection: 0.2, 0.4, 0.6, 0.8, 1.0

Input dynamic range Input impedance range Respiration Rate

0.2 to 32 Ω 100 to 5000 Ω min. 4 bpm max. 120 bpm >3 MΩ

Lead off detection

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2

FUNCTIONAL DESCRIPTION

2.1 Measurement principle 2.1.1 NIBP NIBP (Non-Invasive Blood Pressure) is an indirect method for measuring blood pressure. The NIBP measurement is performed according to the oscillometric measuring principle. The cuff is inflated with a pressure slightly higher than the presumed systolic pressure, and deflated at a speed based on the patient’s pulse, collecting data from the oscillations caused by the pulsating artery. Based on these oscillations, values for systolic, mean, and diastolic pressures are calculated. The following parts are necessary for the NIBP measurement: •

M-PRESTN/-RESTN/-PRETN module

•

twin hose (adult or infant model)

•

blood pressure cuffs (various sizes)

2.1.2 ECG Electrocardiography analyzes the electrical activity of the heart by measuring the electrical potential produced with electrodes placed on the surface of the body. ECG reflects: •

electrical activity of the heart

•

normal/abnormal function of the heart

•

effects of anesthesia on heart function

•

effects of surgery on heart function

See the User's Guide or the User’s Reference Manual for electrodes positions and other information.

2.1.3 Pulse oximetry A pulse oximeter measures the light absorption of blood at two wavelengths, one in the near infrared (about 900 nm) and the other in the red region (about 660 nm) of the light spectrum. These wavelengths are emitted by LEDs in the SpO2 probe, the light is transmitted through peripheral tissue and is finally detected by a PIN-diode opposite the LEDs in the probe. The pulse oximeter derives the oxygen saturation (SpO2) using an empirically determined relationship between the relative absorption at the two wavelengths and the arterial oxygen saturation SaO2. In order to measure the arterial saturation accurately, pulse oximeters use the component of light absorption giving variations synchronous with heart beat as primary information on the arterial saturation. A general limitation of pulse oximetry is that due to the use of only two wavelengths only two hemoglobin species can be discriminated by the measurement. The modern pulse oximeters are empirically calibrated either against fractional saturation SaO2frac; 8 Document No. 8005571-1

S/5 M-PRESTN Modules

SaO2frac =

HbO2 HbO2 + Hb + Dyshemoglobin

Formula 1

or against functional saturation SaO2func; SaO2func =

HbO2 HbO2 + Hb

Formula 2

Functional saturation is more insensitive to changes of carboxyhemoglobin and methemoglobin concentrations in blood. The oxygen saturation percentage SpO2 measured by the Datex-Ohmeda module is calibrated against functional saturation SaO2func. The advantage of this method is that the accuracy of SpO2 measurement relative to SaO2func can be maintained even at rather high concentrations of carboxyhemoglobin in blood. Independent of the calibration method, pulse oximeters are not able to correctly measure oxygen content of the arterial blood at elevated carboxyhemoglobin or methemoglobin levels.

Plethysmographic pulse wave The plethysmographic waveform is derived from the IR signal and reflects the blood pulsation at the measuring site. Thus the amplitude of the waveform represents the perfusion.

Pulse rate The pulse rate calculation is done by peak detection of the plethysmographic pulse wave. The signals are filtered to reduce noise and checked to separate artifacts.

Probe The standard probe is a finger clamp probe which contains the light source LEDs in one half and the photodiode detector in the other half. Different kinds of probes are available from Datex-Ohmeda. SpO2 sensor connector 6

IRED

Emitter

7

RED

4 5 8 9

Detector

Figure 2

GND ILED GND DEF_A IS DET_C

PRSTN_absorption_of_infrared.vsd

SpO2 sensor cable

Absorption of infrared light in the finger probe, parts layout and schematic diagram

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2.1.4 Temperature The temperature is measured by a probe whose resistance varies when the temperature changes, called NTC (Negative Temperature Coefficient) resistor. The resistance can be measured by two complementary methods: •

Applying a constant voltage across the resistor and measuring the current that flows through it

•

Applying a constant current through the resistor and measuring the voltage that is generated across it.

In Datex-Ohmeda modules the two methods are combined in the form of a voltage divider. The NTCresistor is connected in series with a normal resistor and a constant voltage is applied across them. The temperature dependent voltage can be detected at the junction of the resistors, thus producing the temperature signal from the patient. The signal is amplified by analog amplifiers and further processed by digital electronics.

2.1.5 Invasive blood pressure 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 transducer is placed at the same level with the heart, and is electrically zeroed. The transducer is a piezo-resistive device that converts the pressure signal to a voltage. The monitor interprets the voltage signal so that pressure data and pressure waveforms can be displayed.

2.1.6 Respiration Impedance respiration is measured across the thorax between ECG electrodes. The respiration signal is made by supplying current between the electrodes and by measuring the differential current from the electrodes. The signal measured is the impedance change caused by breathing. From these impedance changes, respiration rate is calculated, and the respiration waveform is displayed on the screen.

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S/5 M-PRESTN Modules

2.2 Main components 2.2.1 M-PRESTN/-RESTN/-PRETN modules Auto On/Off

Start Cancel

Zero P1

Zero P2

SpO2

NIBP

ECG

Figure 3

T1

P1

T2

P2

Front panel of M-PRESTN

The M-PRESTN, M-RESTN, and M-PRETN modules contain three main PC boards, the STP board, the ECG board, and the NIBP board. They work independently. Each of these has their own processor and software in the processor flash memory. There are two small boards, the SP input and the ECG input board attached to the front panel of the module. The front panel has seven connectors and four keys. The connectors are two for temperature measurement, two for invasive blood pressure measurement, one for ECG, one for NIBP, and one for SpO2 measurement. The keys are for NIBP Auto On/Off, NIBP Start/Cancel, P1 zero, and P2 zero.

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2.2.2 NIBP board PATIENT AND NIBP CUFF

NIBP TUBING

NIBP CONNECTOR

NIBP PNEUMATICS

DRIVERS FOR PUMP & VALVES

PRESSURE SENSORS

NIBP CONTROL KEYS

MAIN CPU

SAFETY CPU

NV MEMORY RS 485 COMMUNICATION

NIBP BLOCK DIAGRAM Figure 4

POWER SUPPLY

MODULE BUS CONNECTOR

NIBP board functional block diagram

Signal processing Two signals from the pressure transducers are amplified and sent to the A/D converter. After the converter, digitized signals are sent to the microprocessor for data processing. The NIBP board is controlled with a H8/3052 microprocessor at 16 MHz oscillator frequency. 12 Document No. 8005571-1

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Memory NIBP program memory (processor flash memory) size is 512k × 8. The processor has 4 kBytes RAM and there is also an external RAM memory the size of which is 128k x 8. Variable values of the NIBP measurement are stored into the external RAM. The EEPROM size is 512 x 8 and it is used to store the calibration values for the pressure transducers, the pulse valve constants gained during measurements, the PC board identification, and module serial number.

Software control Software controls valves and pump. In addition to the individual on/off signals for each component there is a common power switch for the valves and the pump that can be used at pump/valve failures. In addition to external RS485 reset line the microprocessor system is equipped with its own powerup reset. See the section in the ECG board’s description: “RS485 communication”

Safety circuit The NIBP board is equipped with an independent safety circuit to disconnect supply voltages from the pump and the valves if the cuff has been pressurized longer than the preset maximum measurement time, or if the pressure of the cuff is inflated over the specified pressure limit. The maximum measurement time values and pressure limits for different measurement modes have been specified in the technical specification section of this manual.

Pneumatics Pneumatics of PRESTN module has the following parts: •

Intake air filter; for preventing dust and other parts to enter the air pump and the valves.

•

Air pump: for pumping the measuring pressure of the cuff.

•

(Pulse) Valve; for producing a linear pressure fall (bleeding) in order to measure the blood pressure of the patient. Note that there has been used also two other names Valve and Set valve to designate pulse valve in service menu.

•

Safety valve; The safety valve has been intended to be used for deflating the cuff in single fault case, i.e. to prevent too long measurement time or too high inflation pressure of the cuff. Note that there has been used also Exh2 valve to designate the Safety valve in service menu.

•

Main pressure sensor; for measuring the pressure of the blood pressure cuff and the pressure fluctuations caused by arterial wall movement.

•

Safety pressure sensor for detection of cuff hose type, cuff loose, cuff occlusion situations etc.and recognising the pressure sensor fault.

•

Cuff connector; for connecting the cuff.

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Safety pressure sensor

Cuff connector Proportional valve

Main pressure sensor

Dump valve Intake air filter

Figure 5

NIBP_pneum_diagr.vsd

Air pump

NIBP pneumatics diagram

Power supply section of the NIBP board All connections are established via 25-pin connector (D-type, female). The module needs +15 V (dirty) power supply to operate. The supply voltage (+15V) is generated in the power supply section of the S/5 monitor. The other voltages needed for the operation of the NIBP measurement are made on the NIBP board.

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2.2.3 ECG board in 12-lead measurement The 12-lead ECG measurement consists of the elements shown in Figure 6. All functions are located in the ECG board except the ECG input unit . PATIENT AND ECG ELECTRODES ECG CABLE - ECG LEAD SET - ECG TRUNK CABLE ECG INPUT UNIT - ECG CONNECTOR - INPUT PROTECTION RESISTORS INPUT PROTECTION DIODES FOR ECG & RESPIRATION MEASUREMENT

INPUT FILTERING FOR ECG & RESPIRATION MEASUREMENTS

RESPIRATION MEASUREMENT AMPLIFIERS

RESPIRATION MEASUREMENT CURRENT SUPPLY

ECG PREAMPLIFIERS & RLD CIRCUIT

LEADS OFF & PACER & DEFIBRILLATION DETECTION

BASELINE RESTORATION

ECG CPU

NV MEMORY RS 485 COMMUNICATION ISOLATION

POWER SUPPLY ISOLATION

MODULE BUS CONNECTOR

ECG BLOCK DIAGRAM

Figure 6

12-lead ECG measurement block diagram

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