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Apparatus for monitoring electrical physiologic signals

  • US 5,117,824 A
  • Filed: 11/14/1990
  • Issued: 06/02/1992
  • Est. Priority Date: 11/14/1990
  • Status: Expired due to Term
First Claim
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1. In an implantable cardioverter comprising means for detecting a tachyarrhythmia and means for treating said tachyarrhythmia, said cardioverter also comprising pulse generator means for generating cardiac pacing pulses, the improvement comprising:

  • variable threshold R-wave detector means for detecting the occurrence of R-waves and for providing output signals indicative of the detection of said R-waves, said signals provided to said tachyarrhythmia detection means, said variable threshold R-wave detector means comprising means for defining an R-wave detection threshold and means for adjusting said R-wave detection threshold to a value based upon the amplitude of a detected R-wave and further includes means for gradually reducing said R-wave detection threshold following said detected R-wave;

    cardiac pacemaker timing means for defining a V--V interval and for triggering said pulse generator means at the expiration of said V--V interval, said timing means reset by the output of said R-wave detector means; and

    disable means for disabling said threshold adjusting means from adjusting said R-wave detection threshold in response to an R-wave following a cardiac pacing pulse from said pulse generator means.

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