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Apparatus for detection and treatment of tachycardia and fibrillation

  • US 5,330,508 A
  • Filed: 03/02/1993
  • Issued: 07/19/1994
  • Est. Priority Date: 03/02/1993
  • Status: Expired due to Term
First Claim
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1. Apparatus for treating tachyarrhythmias, comprising:

  • treatment means for delivering a first therapy to a patient'"'"'s heart to treat tachycardia and a second therapy to said patient'"'"'s heart to treat fibrillation;

    first means for sensing electrical signals from said patient'"'"'s heart indicative of the depolarization of a chamber or chambers of said patient'"'"'s heart;

    means for measuring and storing the intervals separating said electrical signals;

    means for detecting the occurrence of a tachyarrhythmia; and

    tachycardia/fibrillation discriminator means responsive to said detecting means for selecting between said first and second therapies, said discriminator means in turn comprising;

    means for sorting said measured intervals into interval ranges;

    means for determining the numbers of intervals within each said interval range;

    means for identifying ones of said interval ranges which have the highest numbers of said stored intervals;

    means for determining the total number of said stored intervals falling within said identified interval ranges; and

    means for triggering said first therapy if said total number meets a predetermined criterion.

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