Apparatus and method for impedance pneumography

Details Apparatus and method for impedance pneumography Apparatus and method for impedance pneumography

1986-08-06

1987-11-24

Cohen, Lee S.

Surgery

Truss

Pad

324 65R, A61B 508

Patent

active

047081465

ABSTRACT:
An apparatus and method for monitoring the expansion and contraction of the thoracic cavity during respiration is disclosed. A constant current carrier is passed through the thorax of a patient using a pair of ECG leads. The resulting amplitude modulated voltage signal is synchronously detected using a reference signal which is phase-locked to the amplitude modulated voltage signal. A phase locked loop (PLL) having a tri-state phase comparator and a voltage controlled oscillator (VCO) is used to generate the reference signal. A dead zone compensation circuit is coupled to the VCO to provide a trickle current that causes the tri-state phase comparator to be biased out of its null state.

REFERENCES:
patent: 3532087 (1970-10-01), Horn et al.
patent: 3802419 (1974-04-01), Yates
patent: 3882851 (1975-05-01), Sigworth

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