Noise discrimination in implantable pacemakers

Details Noise discrimination in implantable pacemakers Noise discrimination in implantable pacemakers

1989-11-17

1991-04-30

Jaworski, Francis

Surgery

Truss

Pad

128419PG, 128901, 128708, A61B 504

Patent

active

050108875

ABSTRACT:
A noise discrimination circuit determines if sensed electrocardiographic (ECG) pulsed signals sensed within a pulse generator are valid ECG signals, i.e., valid P-waves or R-waves, or noise. The ECG signal may then be processed. The processed ECG signal is monitored to determine both the amplitude and duration of any signal pulses appearing thereon. If the amplitude of a given ECG signal pulse exceeds a prescribed threshold level for a prescribed time period, the pulse is considered to be a valid ECG signal. The noise discrimination circuit includes: a threshold detector for determining if the amplitude of the ECG signal exceeds the prescribed threshold level; a timer circuit for generating a timed window signal, triggered by the threshold detector whenever the ECG signal amplitude exceeds the prescribed threshold level; and logic circuitry for determining if the amplitude of the ECG signal remains above the threshold level for the duration of the timed window signal. One embodiment allows the prescribed threshold level and duration of the timed window signal to be programmably selected.

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U.S. Patent Application Ser. No. 793,538 (Davies), filed 10/31/85.

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