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Atrial rate based programmable pacemaker with automatic mode switching means

  • US 4,944,298 A
  • Filed: 05/23/1989
  • Issued: 07/31/1990
  • Est. Priority Date: 05/23/1989
  • Status: Expired due to Term
First Claim
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1. An improved dual chamber pacemaker having programmable modes of operation, said pacemaker being capable of stimulating the atrial and the ventricular chambers of the heart, said pacemaker including programming means for selectively allowing the pacemaker to be programmed to operate in an atrial rate based mode of operation, and atrial sensing means for sensing atrial activity occurring in the atrial chamber, including atrial rate of said atrial activity, wherein the improvement comprises:

  • first sensing means for monitoring said atrial rate and sensing whether said atrial rate exceeds a first prescribed threshold;

    means for providing a stimulating pulse to a selected chamber of the heart at a maximum upper rate in the event said atrial rate sensed by said first sensing means exceeds said first prescribed threshold;

    second sensing means for monitoring said atrial rate above said first prescribed threshold and sensing whether said atrial rate exceeds a second prescribed threshold, said second threshold being at a higher rate than said first threshold; and

    means for automatically switching the mode of operation of said pacemaker from said atrial rate based mode of operation to a selected alternate mode of operation in the event said atrial rate exceeds said second prescribed threshold.

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