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Evoked and spontaneous cardiac activity detection in a dual-chamber electronic pacemaker and method

  • US 5,713,934 A
  • Filed: 10/12/1995
  • Issued: 02/03/1998
  • Est. Priority Date: 10/12/1995
  • Status: Expired due to Term
First Claim
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1. In an implantable electronic pacemaker, a method of controlling when a backup stimulation pulse is generated and delivered to a patient'"'"'s heart, the method comprising:

  • generating a first cardiac stimulation pulse;

    initiating an evoked response detection time period in response to the generation of the first cardiac stimulation pulse;

    initiating a refractory time period in response to the generation of the first cardiac stimulation pulse, the refractory time period being a longer time period than the evoked response detection time period;

    detecting whether an evoked response occurs during the evoked response detection time period; and

    terminating the refractory time period in the event an evoked response did not occur during the evoked response detection time period;

    detecting whether a spontaneous response occurs following the terminating of the refractory time period; and

    generating a backup cardiac stimulation pulse only when a spontaneous response does not occur following the terminating of the refractory time period.

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