Surgery: light – thermal – and electrical application – Light – thermal – and electrical application – Electrical therapeutic systems
Patent
1993-09-09
1995-03-07
Kamm, William E.
Surgery: light, thermal, and electrical application
Light, thermal, and electrical application
Electrical therapeutic systems
607 14, A61N 1368
Patent
active
053953967
ABSTRACT:
A heart stimulator is disclosed which is capable of sensing and stimulating both the atrium and the ventricle in a heart such that a ventricular stimulation pulse is emitted, either after expiration of an atrioventricular interval following a stimulated or spontaneous atrial event, or after expiration of a minimum synchronous interval following a stimulated or spontaneous ventricular event, depending on which of the two intervals expires last. After each ventricular event, an atrial refractory period is imposed during which atrial detections are interpreted as noise. Operation of the heart stimulator when the atrium's spontaneous rate is faster than a stimulation rate corresponding to the minimum synchronous interval is improved by measuring the interval between atrial events. If a detection during the atrium's refractory period occurs at a time corresponding to the latest interval timed, the detection is interpreted as an approved atrial event, and a ventricular stimulation pulse is emitted after expiration of the minimum synchronous interval.
REFERENCES:
patent: 4539991 (1985-09-01), Boute et al.
patent: 4890617 (1990-01-01), Markowitz et al.
patent: 4974589 (1990-12-01), Sholder
patent: 5103820 (1992-04-01), Markowitz
patent: 5123412 (1992-06-01), Betzold
patent: 5129393 (1992-07-01), Brumwell
Franberg Per
Lindgren Anders
Kamm William E.
Schaetzle Kennedy J.
Siemens Elema AB
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