Implantable cardiac stimulator with automatic gain control and bandpass filtering in feedback loop

An implantable cardiac stimulator for detecting and treating cardiac arrhythmias includes a sense amplifier (25) 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 contro...

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Bibliographic Details
Main Authors WHISTLER, STEPHEN J, CALFEE, RICHARD V, BAKER, ROSS G., JR, HALUSKA, EDWARD A
Format Patent
LanguageEnglish
French
German
Published 20.03.1996
Edition5
Subjects
DIAGNOSIS
ELECTROTHERAPY
HUMAN NECESSITIES
HYGIENE
IDENTIFICATION
MAGNETOTHERAPY
MEDICAL OR VETERINARY SCIENCE
RADIATION THERAPY
SURGERY
ULTRASOUND THERAPY
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Summary:An implantable cardiac stimulator for detecting and treating cardiac arrhythmias includes a sense amplifier (25) 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 (60), a filter (70) and quad comparator (80) 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 (65) containing a microprocessor (68) 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.
Bibliography:Application Number: EP19890305623