Implantable medical devices using heuristic filtering in...

Details Implantable medical devices using heuristic filtering in... Implantable medical devices using heuristic filtering in...

2006-08-01

2009-11-24

Layno, Carl H (Department: 3766)

Surgery

Diagnostic testing

Cardiovascular

C600S509000, C607S009000, C341S061000

Reexamination Certificate

active

07623913

ABSTRACT:
Methods for performing cardiac signal analysis in an implanted medical device, and devices configured to perform illustrative methods of cardiac signal analysis. A cardiac signal is captured by an implanted device using implanted electrodes and, during at least certain conditions, the cardiac signal undergoes heuristic filtering. In some embodiments, heuristic filtering is achieved by modifying a signal or value that is used as an indicator of received signal amplitude. In an illustrative example, the heuristic filtering includes periodically incrementing or decrementing the signal or value toward a desired quiescent point, where the heuristic filter period is significantly longer than the sampling period for the signal itself. In another illustrative example, the heuristic filter frequency can be adjusted dynamically to keep the signal average near the desired quiescent point.

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