Methods and apparatus for sensing intracardiac signals for an inplantable cardiac pacemaker
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United States of America Patent
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Feb 14, 1995
Grant Date -
N/A
app pub date -
Dec 23, 1993
filing date -
Dec 23, 1992
priority date (Note) -
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Abstract
A circuit for use in an implantable cardiac pacemaker for use in processing intracardiac signals and methods of processing such signals. The circuit includes a passive filter 1 has a bandwidth of 0.1 to 80 Hz approximately. An amplifier 2 with switched capacitors presents at the output a dynamics of 0.8V approximately and a gain lower than 50. An analog-to-digital converter 3 with delta modulation, which is controllably variable in step and functions at two frequencies, one of 1 kHz approximately, the other of 4 kHz approximately. The circuit may be used for both processing said signals to identify spontaneous cardiac events and to telemeter an intracardiac ECG.
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