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Dual chamber pacemaker with AV extension and PMT control

  • US 5,247,929 A
  • Filed: 02/04/1992
  • Issued: 09/28/1993
  • Est. Priority Date: 02/04/1992
  • Status: Expired due to Term
First Claim
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1. A dual chamber pacemaker having ventricular generating means for generating ventricular pace pulses, atrial sensing means for sensing atrial events, AV means for timing out an AV interval following an atrial event and triggering generation of a ventricular pace pulse following said AV time out, and VV means for timing out a ventricular pacing interval and for triggering generating of a ventricular pace pulse following said V--V time out in the absence of an earlier ventricular event, further comprising VA test means for carrying out a VA interval test, said test means comprisingchanging means for changing at least one of said AV and VV intervals to a predetermined interval for a predetermined number of pacemaker cycles;

  • interval means for determining a measure of each VA interval over a predetermined number of cycles;

    equality means for determining VA interval equality from said VA interval measures;

    comparing means for comparing a measure of the equal VA interval when equality is determined with both predetermined respective retrograde conduction (RC) and far field R wave sensing (FFRS) criteria;

    FFRS means for decreasing the opportunity of said atrial sensing means to sense far field R waves when said FFRS criterion is met; and

    RC means for disabling response by said pacemaker to a retrogrde conduction when said RC criterion is met.

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