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System and method for atrial autocapture in single-chamber pacemaker modes using far-field detection

  • US 6,101,416 A
  • Filed: 07/29/1998
  • Issued: 08/08/2000
  • Est. Priority Date: 07/29/1998
  • Status: Expired due to Term
First Claim
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1. A system for detecting capture in an atrial chamber of a patient'"'"'s heart and implemented in an implantable pacemaker implanted in the patient and connected to the atrial chamber via a lead, the system comprising:

  • pulse generating means for generating a stimulation pulse for delivery to the atrial chamber through the lead to trigger a subsequent contraction in a ventricular chamber of the heart so as to produce a far-field signal;

    first sampling means for generating a far-field signal sample by sampling the produced far-field signal during a far-field interval window;

    window generating means for periodically determining the far-field interval window; and

    first control means for comparing the far-field signal sample to a predetermined far-field signal recognition template, such that;

    (i) when the far-field signal sample is approximately equal to the predetermined far-field signal recognition template, the first control means generates a first signal indicative of presence of atrial capture, and(ii) when the far-field signal sample is not approximately equal to the predetermined far-field signal recognition template, the first control means generates a second signal indicative of absence of atrial capture.

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