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Automatic threshold sensitivity adjustment for cardiac rhythm management devices

  • US 6,029,086 A
  • Filed: 06/15/1998
  • Issued: 02/22/2000
  • Est. Priority Date: 06/15/1998
  • Status: Expired due to Term
First Claim
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1. An implantable cardiac rhythm management device capable of automatically sensing intrinsic events of a patient'"'"'s heart and having an adjustable sensing threshold, said device including:

  • (a) a pulse generator;

    (b) a controller for controlling activation of the pulse generator;

    (c) conduction means for conducting an electrocardiogram signal which includes electrical impulses corresponding to cardiac depolarization and noise;

    (d) detecting means coupled to the conduction means for detecting intrinsic events from the signal;

    (e) measuring means for at least estimating an amplitude of the noise during a period following detected intrinsic events and memory means for storing the estimated amplitude of noise over a plurality of detected intrinsic events; and

    (f) adjusting means for adjusting the sensing threshold dependant upon the amplitude of noise estimated from the detected plurality of intrinsic events.

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