Chapter 2 Principles
2.2.3 CO/IBP
Module
2.2.3.1 General
This module provides the function of measuring two parameters: Cardiac Output (CO) and
Invasive Blood Pressure (IBP).
2.2.3.2 Principle diagram
Figure 2-6 Working principle of the CO/IBP module
2.2.3.3 Principle
This module collects the CO/IBP signal through the transducers, processes it and sends it
to the main board throgh the serial port.
CO Signal Process Network
The CO parameter is measured with the thermal dilution method. The transducer
sends two signals (TI: Temperature of Injectate; TB: Temperature of Blood) to the CO
Signal Process Network. After that, the signals are amplified and low-pass filtered, and
then sent to the CPU System for processing.
IBP Signal Process Network
The IBP signal is the differential signal. After the common-mode filtering, the difference
signal is amplified by the difference amplifying circuit which changes the dual-end signal
to the single-end signal. After the low-pass filtering, the IBP signal is sent to the CPU
System for processing.
CPU System
Converting the analog signal obtained by the circuit to the digital signal;
Implementing the logical control of all parameter parts;
Implementing the data processing for the two parameters;
Implementing the communication with the main board.
Power & Signal isolate Circuit
Isolating the external circuits to ensure the safety of human body;
Supplying power for all circuits;
Implementing the isolation communication between the CPU System and the main
board.
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Summary of Contents for PM-9000 Express
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