Arrhythmia rejection circuit for gated cardiac image display sys

Details Arrhythmia rejection circuit for gated cardiac image display sys Arrhythmia rejection circuit for gated cardiac image display sys

1978-12-06

1981-01-20

Kamm, William E.

Surgery

Truss

Pad

A61B 0000

Patent

active

042456479

ABSTRACT:
Signals associated with heart beats occurring at the normal rhythm of the heart and also with extrasystoles or PVCs are fed to a one-shot multivibrator which is enabled to produce clock signals corresponding with incoming heart activity indicating signals such as R-wave signals provided the R-wave signals are spaced in time to correspond with normal heart rhythm. An analog signal corresponding with average heart rate is fed to an integrator. The ramp output of the integrator is fed to one input of a comparator and a reference signal representative of a percentage of time between normal rhythm R-waves is fed to the other input of the comparator. Until the two input signals cross over, the output signal of the comparator is such as to inhibit output of a clock signal from the multivibrator so R-wave signals associated with extrasystoles occurring during the integration or lockout period are not gated through the multivibrator. The clock signals corresponding with predictable rhythmically occurring heart activity signals are used for gating image forming devices and image data devices on and off at identical times in a sequence of heart cycles to produce a stop-motion effect.

REFERENCES:
patent: 3593705 (1971-07-01), Thomas et al.
patent: 3618593 (1971-11-01), Nachev et al.
patent: 3626932 (1971-12-01), Becker
patent: 3672353 (1972-06-01), Crovella et al.
patent: 3698386 (1972-10-01), Fried
patent: 3718827 (1973-02-01), Ragsdale
patent: 3960140 (1976-06-01), Buxton
patent: 4033335 (1977-07-01), Nickles

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