Medical monitor with failure protection

Details Medical monitor with failure protection Medical monitor with failure protection

1993-11-24

1998-08-11

Peffley, Michael

Surgery

Diagnostic testing

Respiratory

600529, A61B 504

Patent

active

057920680

ABSTRACT:
An apparatus for and method of monitoring respiration of a patient using impedance changes of the body to indicate respiration events. The impedance changes are measured by applying a carrier signal across the thorax of the patient. The carrier is periodically interrupted to produce a quiet period. A first level detector assumes the presence of EMI if the signal present during the quiet period exceeds a predetermined threshold. A second level detector senses the presence of substantial high frequency EMI. At initial power up, a third level detector checks for presence of signal before the carrier drive is applied. A fourth test circuit checks for the hang up of the differential amplification circuit.

REFERENCES:
patent: 4091818 (1978-05-01), Brownlee et al.
patent: 4228803 (1980-10-01), Rickards
patent: 4235242 (1980-11-01), Howson et al.
patent: 4506678 (1985-03-01), Russell et al.
patent: 4803997 (1989-02-01), Bowman
patent: 4934377 (1990-06-01), Bova et al.

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