Respiration rate monitor

Details Respiration rate monitor Respiration rate monitor

1989-09-29

1992-09-01

Howell, Kyle L.

Surgery

Truss

Pad

128671, A61B 508

Patent

active

051430789

ABSTRACT:
A monitoring system for providing an accurate indication of a patient's respiration rate. The system is effective in eliminating or significantly reducing the effects of heart sounds and ambient noise. The system comprises means for obtaining a first signal waveform containing components corresponding to the patient's breath sounds, as well as components corresponding to heart sounds and ambient noise. The signal is passed through a digital bandpass filter having a passband selected to remove heart sounds and ambient noise to produce a second waveform. From the second waveform the total energy is computed of a portion of the signal within a moving window of predetermined length. The resulting energy envelope signal is smoothed and then high-pass filtered by removing the average DC value of the signal over a predetermined preceding time interval. Respiration is detected by identifying significant, positive-going zero crossings of the resulting signal through a band about zero. The zero-band threshold used to obtain this waveform can be controlled by the operator or pre-set for a particular sensitivity.

REFERENCES:
patent: 4306567 (1981-12-01), Krasner
patent: 4686999 (1987-08-01), Snyder et al.
patent: 4694837 (1987-09-01), Blakeley et al.
Zarra, Conf.: Procedd. 7th New Eng. Bioeng. Conf., Troy, N.Y., Nov. 22-23, 1979.

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