Implantable stimulation device having means for optimizing current drain

  • US 5,697,956 A
  • Filed: 06/02/1995
  • Issued: 12/16/1997
  • Est. Priority Date: 06/02/1995
  • Status: Expired due to Term
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First Claim
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1. An implantable pacemaker comprising:

  • a battery;

    pulse generating means for selectively generating electrical stimulation pulses at appropriate times for the purpose of depolarizing cardiac tissue, the electrical stimulation pulses being formed from electrical energy derived from the battery;

    means for detecting capture at a patient'"'"'s stimulation threshold; and

    pulse setting means, wherein the pulse setting means comprises;

    means for determining a plurality of stimulation thresholds at a plurality of pulse widths at which capture is detected corresponding to a strength-duration curve;

    means for adding a desired safety factor to the strength-duration curve to produce a plurality of pulse amplitude/pulse width combinations that would ensure capture at the desired safety factor;

    means for determining a pacing current drain for each of the plurality of pulse amplitude/pulse width combinations that would ensure capture at the desired safety factor; and

    means for selecting an optimal pulse amplitude/pulse width combination corresponding to a pulse amplitude/pulse width combination which ensures capture at the desired safety factor with the lowest pacing current drain.

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