A - Human Necessities – 61 – N
Patent
A - Human Necessities
61
N
326/1.2
A61N 1/36 (2006.01) A61N 1/37 (2006.01)
Patent
CA 1145407
ABSTRACT A sense amplifier for demand cardiac pacemaker of the type having circuitry for providing signals repre- sentative of sensed signals and circuitry responsive to the sensed signal representative signal to detect heart activity. Circuitry is provided intermediate the respon- sive and detecting circuitry for preventing the response of the detecting circuitry for a limited time during and after a pacemaker stimulation signal. In a preferred em- bodiment a reference level is established which is repre- sentative of sensed extraneous repetitive noise. A second level is established which is greater in absolute value than the reference level by an amount representative of sensed heart activity. The detecting circuitry is differ- entially responsive to the reference and second level for detecting heart activity. The refractory period is esta- blished by blocking all signals from the level establish- ing circuitry for a limited period during and after a pace- maker stimulation signal, that circuitry assuming the qui- escent condition during that limited period.
339163
Medtronic Inc.
Smart & Biggar
LandOfFree
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