System for the detection of cardiac events

  • US 6,609,023 B1
  • Filed: 09/20/2002
  • Issued: 08/19/2003
  • Est. Priority Date: 09/20/2002
  • Status: Active Grant
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First Claim
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1. A system for detecting a cardiac event in a human patient the system including:

  • at least two electrodes implanted in the patient for obtaining the electrical signal from the patient'"'"'s heart, the electrical signal being an electrogram;

    an implanted cardiosaver including (a) analog-to-digital converter circuitry for digitizing the electrogram to produce electrogram segments having a time duration that is at least 1 second;

    (b) means for processing a first electrogram segment at a first predetermined time to extract at least one baseline heart signal parameter of the patient;

    (c) memory means for storing the at least one baseline heart signal parameter;

    (d) means for processing a second electrogram segment at a later, second predetermined time to extract at least one heart signal parameter of the patient; and

    , (e) processor means coupled to the memory means designed to detect the cardiac event when the at least one heart signal parameter extracted at the second predetermined time shifts by more than a predetermined threshold amplitude from the at least one baseline heart signal parameter extracted at the first predetermined time.

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