Implantable cardiac stimulator with automatic gain control...

Details Implantable cardiac stimulator with automatic gain control... Implantable cardiac stimulator with automatic gain control...

A - Human Necessities

61

N

326/1.6

A61N 1/365 (2006.01) A61B 5/04 (2006.01) A61N 1/362 (2006.01) A61N 1/37 (2006.01) A61N 1/39 (2006.01)

Patent

CA 1325661

ABSTRACT OF THE DISCLOSURE An implantable cardiac stimulator for detecting and treating cardiac arrhythmias includes a sense amplifier responsive to sensed cardiac signals for detecting and distinguishing normal and abnormal cardiac activity within the sensed signals. The sense amplifier includes an automatic gain control amplifier, a filter and quad comparator having a pair of signal channels for processing the sensed signals according to different frequency bandpass characteristics to establish sensing thresholds, margins and signal gain. The sense amplifier has a feedback loop containing a microprocessor which implements preselected algorithms in conjunction with the outputs of the quad comparator to variably adjust the amplifier gain and to programmably control the sensing margin.

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