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Automatic cardiac capture restoration and threshold-seeking method and apparatus

  • US 5,320,643 A
  • Filed: 10/06/1992
  • Issued: 06/14/1994
  • Est. Priority Date: 10/06/1992
  • Status: Expired due to Term
First Claim
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1. A cardiac pacemaker capable of automatically seeking stimulation signal thresholds to increase power efficiency comprising:

  • capture detection means for detecting capture of a heart;

    amplitude seeking means coupled to said capture detection means for seeking amplitude thresholds of said stimulation signals; and

    pulse width seeking means coupled to said capture detection means for seeking pulse width thresholds of said stimulation signals;

    wherein said pulse width seeking means comprises means for, in response to a loss-of-capture condition detected by said capture detection means, increasing said pulse width to a maximum programmed level for a predetermined timeout period, and for seeking lower pulse width thresholds when capture is maintained after the expiration of said predetermined timeout period.

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