Pacemaker artifact suppression in coronary monitoring

Details Pacemaker artifact suppression in coronary monitoring Pacemaker artifact suppression in coronary monitoring

1977-03-28

1979-04-17

Michell, Robert W.

Surgery

Truss

Perineal

A61B 502

Patent

active

041495276

ABSTRACT:
In cardiac signal processing apparatus, there is provided improved means for suppressing pacer signal artifacts, including both the discharge pulse and the recharge waveform (tail) of such artifact. Rate-limiting circuitry is used to substantially suppress the discharge pulse. However additional circuitry responsive to the detection of a pacer pulse is operative to obtain a measure of the electrical discharge of the discharge portion of the respective pacer pulse and to use such measure to generate a tail suppression signal which, when added to the original signal, substantially cancels the original pacer tail.
A feed-back loop is opened by the rate-limiter when a pacer pulse occurs and in turn permits a large signal to be imposed on a threshold-level-type pacer pulse detector for connecting the large signal (pacer pulse) to a capacitor during the discharge portion of the pacer pulse. The capacitor begins to discharge shortly after the pacer pulse's discharge portion with a polarity and time constant selected to substantially cancel (when summed) the pacer tail.

REFERENCES:
patent: 3374435 (1968-03-01), Engel
patent: 3674015 (1972-07-01), Berkovits
patent: 3923041 (1975-12-01), Stasz et al.
patent: 3986496 (1976-10-01), Brastad
patent: 4000461 (1976-12-01), Barber et al.

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