Respiration monitor

Details Respiration monitor Respiration monitor

1982-03-08

1984-05-22

Cohen, Lee S.

Surgery

Truss

Pad

A61B 505

Patent

active

044495374

ABSTRACT:
A respiration monitor for detecting effective respiration of a patient includes circuitry for suppressing the indication of unwanted signals due to heart activity, noise and flat breathing. A first threshold circuit is provided for increasing the sensitivity of the respiration monitor in response to a decreasing amplitude of the measured respiration signals. A first comparator circuit provides a fixed amplitude threshold below which detected signals are fully neglected. A second threshold circuit provides an adjustable amplitude threshold for the measured respiration signal, which threshold is raised in response to a decreasing respiration frequency below a predetermined frequency limit. Effective respiration is indicated only if all the aforementioned amplitude thresholds are exceeded.

REFERENCES:
patent: 3976052 (1976-08-01), Junginger et al.
patent: 4306567 (1981-12-01), Krasner
patent: 4379460 (1983-04-01), Judell

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