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Implantable medical device system with method for determining lead condition

  • US 5,741,311 A
  • Filed: 06/27/1996
  • Issued: 04/21/1998
  • Est. Priority Date: 06/27/1996
  • Status: Expired due to Term
First Claim
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1. An implantable pacemaker system, comprising a pacemaker and a lead, the pacemaker having means for delivering pace pulses to a patient'"'"'s heart through the lead and the pacemaker having means for sensing patient heart signals through the lead, the system having lead impedance means for obtaining a measure of a lead impedance, said lead impedance means further comprising a controllable burst generator for delivering to said lead an AC burst having a duration in a range of 50-125 ms and a limited current, and timing means for controlling the timing of said burst to follow a delivered pace pulse so that said burst is delivered substantially within a refractory period of the patient'"'"'s heart following delivery of said pace pulse.

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