Datascope Passport - Mindray
Datascope Passport - Mindray
Datascope Passport - Mindray
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Theory of Operation Patient Connector Board AAMI<br />
2.5 Patient Connector Board AAMI<br />
The ECM Patient Connector board is intended for use with cables having integral 1k<br />
resistors, which eliminate the possibility of harmful arc-over at the connector pins during<br />
defibrillation.<br />
2.5.1 Spark Gap Suppressor<br />
2.5.2 Neon Bulbs<br />
The patient cable is attached to the patient connector board. The clamping of defibrillator<br />
transients, consisting of a neon bulb with each electrode circuit which clamps the peak<br />
voltage with respect to isolated ground in series with the coupling capacitors. The cable<br />
resistors absorb the remaining defibrillator voltage.<br />
This board provides defibrillator overload protection in conjunction with the front-end board.<br />
The neon bulbs has a breakdown voltage range 60 v to 75 Volts. The patient’s ECG and<br />
Respiration signals pass through the neon bulbs, which suppresses the defibrillation pulses.<br />
2.5.3 Low-Pass Filter<br />
The patient cable is attached to the patient connector board. The ECG signal and the<br />
respiration signal pass through the AAMI connector J1. This board contains 3 LC Low -Pass<br />
Filters with a minimum roll-off frequency of 17 MHz. A cut-off frequency of 23 MHz<br />
(-3dB)<br />
2.5.4 EMI Suppressor<br />
The temperature probe connects to a three-circuit phone jack connector on the Patient<br />
Connector board. The temperature circuit provides high-precision measurements of the<br />
thermistor resistance, while using a minimum of precise components. This module also<br />
features electrosurgical interference suppression (ESIS) and EMI suppression. The Connector<br />
cable is used to reduce Conducted Susceptibility and Radiated Susceptibility induced by the<br />
high frequency fields. The module serves simply as a connector; the signals pass through<br />
efficiently and with minimum loss.<br />
2.5.5 Patient and Power Isolation<br />
This power supply requires sufficient isolation between the input and output to withstand the<br />
voltage of a defibrillator, up to 2.5 kVrms. Further, it requires low capacitance between the<br />
input and output, to minimize leakage currents which may flow should the patient<br />
accidentally contact line voltage. The patient’s signals in the Patient Connector board must be<br />
isolated to the same degree as the power supply and the ground.<br />
2.5.6 Provide mating for ECG, Temperature and two IBP connectors<br />
The patient cable is attached to the monitor at the Patient Connector board. From the<br />
connector board, the signal flows to the Front-End module, where the bulk of the ECG<br />
processing is performed the transducers are plugged into the monitor via the Patient<br />
Connector board. The Connector board bridges the excitation and ground of the transducers<br />
together, then passes the signals to the main board.<br />
<strong>Passport</strong> 2®/<strong>Passport</strong> 2 LT Service Manual 0070-10-0441 2 - 29