Respiration monitoring method and apparatus including cardio-vas

Details Respiration monitoring method and apparatus including cardio-vas Respiration monitoring method and apparatus including cardio-vas

1979-10-15

1981-12-15

Kamm, William E.

Surgery

Truss

Pad

A61B 505

Patent

active

043054005

ABSTRACT:
A respiration monitor for measuring the variations of the thorax impedance of a patient due to respiration is described. The monitor includes circuitry for suppressing the indication of unwanted signals caused by cardio-vascular activity of the patient. The circuitry receives trigger signals immediately following the QRS complex of the patient's ECG waveform. If a certain negative-going slope is detected in the thorax impedance waveform following the QRS complex, it is counted as a cardio-vascular artifact and not respiration activity. After a predetermined number of cardio-vascular artifact are detected and counted, the respiration monitor is disabled so that this cardio-vascular activity will not reset an apnea counter.

REFERENCES:
patent: 3347223 (1967-10-01), Pacela
patent: 3524058 (1970-08-01), Robertson et al.
patent: 3584618 (1971-06-01), Reinhard et al.
patent: 3677261 (1972-07-01), Dax
patent: 3976052 (1976-08-01), Junginger et al.
patent: 3994284 (1976-11-01), Voelker
Hamilton et al., "Medical Research Engineering", vol. 11, No. 3, May-Jun., 1972, pp. 20-24.

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