Detector for detecting heart depolarizations

Details Detector for detecting heart depolarizations Detector for detecting heart depolarizations

1994-11-09

1995-10-10

Cohen, Lee S.

Surgery

Truss

Pad

607 26, 128672, 128696, A61N 1362, A61B 504

Patent

active

054562635

ABSTRACT:
A compact, power-sparing detector for detecting heart polarizations is described. The detector has a first operational amplifier which uses sensed heart signals from a heart as an input signal. By means of feedback coupling via a second operational amplifier, a resistor and a capacitor, the system strives to achieve a minimum voltage gradient across the input terminals of the first operational amplifier. When an electrical signal with a signal slope corresponding to a heart depolarization arrives at the input terminal of the first operational amplifier, the second operational amplifier is no longer able to damp the input signal, and a peak output signal is sent from the first operational amplifier to each of a first comparator and a second comparator, respectively. The comparators produce an output signal as long as the output signal from the first operational amplifier is maximal, and the output signal from the comparators is integrated in a time integrator in order to determine the duration of the output signals. If a sufficient duration elapses, a detection signal is generated at the output terminal.

REFERENCES:
patent: 3939824 (1976-02-01), Arneson et al.
patent: 4417306 (1983-11-01), Citron et al.
patent: 5024221 (1991-06-01), Morgan
patent: 5265603 (1993-11-01), Hudrlik
patent: 5271393 (1993-12-01), Callaghan
Patent Abstracts of Japan, vol. 14, No. 435 (C-760), Application No. 63-323904.
Patent Abstracts of Japan, vol. 15, No. 100 (C-813), Application No. 64-133193.

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