Flow-monitoring system for high-frequency ventilation

With the addition of appropriate logic circuitry and a single-board microcomputer, a thermistor flowmeter becomes a clinically useful ventilation monitor. The microcomputer calculates upper and lower reference (voltage) levels from the baseline (normal) flow signal generated by the thermistor bridge...

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Bibliographic Details
Published in:	Critical care medicine Vol. 12; no. 9; p. 824
Main Authors:	Hancock, D E, Pinchak, A C, Hagen, J F
Format:	Journal Article
Language:	English
Published:	United States 01-09-1984
Subjects:	Humans Microcomputers Monitoring, Physiologic - instrumentation Respiration, Artificial - methods Rheology Ventilators, Mechanical
Online Access:	Get more information
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Summary:	With the addition of appropriate logic circuitry and a single-board microcomputer, a thermistor flowmeter becomes a clinically useful ventilation monitor. The microcomputer calculates upper and lower reference (voltage) levels from the baseline (normal) flow signal generated by the thermistor bridge. If the flow signal fails to pass repetitively through one or both of these reference levels, visual and audio alarms are generated. Tests performed with both high-frequency (3 Hz) and low-frequency (0.2 Hz) ventilator systems show the usefulness of this system in sensing a variety of malfunctions, including endotracheal tube occlusions, leaks, changes in flow or tidal volume, and hose disconnects.
ISSN:	0090-3493
DOI:	10.1097/00003246-198409000-00033