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Accurate cardiac event detection in an implantable cardiac stimulus device

  • US 9,802,056 B2
  • Filed: 10/15/2013
  • Issued: 10/31/2017
  • Est. Priority Date: 03/07/2008
  • Status: Active Grant
First Claim
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1. A method of event detection in an implantable cardiac stimulus device having a plurality of electrodes adapted for implantation in a patient, the method comprising:

  • capturing electrical signals from the electrodes;

    comparing captured electrical signals to a detection threshold that varies with time following a detection profile;

    when the captured electrical signals cross the detection threshold, declaring a detected event;

    determining whether either of these conditions is met;

    a) the detected event is similar to a prior detected event, orb) whether the detected event is separated from an immediately prior detected event by an interval exceeding an interval threshold;

    selecting from between first and second variants of a selected detection profile for use in subsequent event detection as follows;

    if b) is met, then selecting the first variant;

    if b) is not met and a) is met, then selecting the first variant; and

    else selecting the second variant; and

    detecting a subsequent cardiac event using the selected variant of the selected detection profile.

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