Implantable cardiac stimulator with automatic gain control and bandpass filtering in feedback loop
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United States of America Patent
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Nov 14, 1989
Grant Date -
N/A
app pub date -
Jun 7, 1988
filing date -
Jun 7, 1988
priority date (Note) -
Expired
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Abstract
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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