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Autocapture system for implantable pulse generator

  • US 5,350,410 A
  • Filed: 11/23/1992
  • Issued: 09/27/1994
  • Est. Priority Date: 11/23/1992
  • Status: Expired due to Term
First Claim
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1. A system for detecting capture in an implantable pulse generator on a beat-by-beat basis, the implantable pulse generator being coupled to an implantable stimulation lead in contact with the heart, the system comprising:

  • pulse generating means for generating stimulation pulses at a desired stimulation pulse energy;

    sensing means, coupled to the stimulation lead, for sensing cardiac signals and for sensing post-stimulation signals which occur following each stimulation pulse, the sensing means including means for sensing first and second post-stimulation signals at each of a plurality of sensitivities, the first post-stimulation signals corresponding to polarization signals sensed at each of a plurality of sensitivities;

    means for comparing the first and second post-stimulation signals at each respective sensitivity and producing as an output a plurality of difference signals, presence of a prescribed difference signal indicating that the heart was captured by the stimulation pulse;

    means for determining an optimum sensitivity setting based on the prescribed difference signal, and for biasing the sensing means to the optimum sensitivity setting for stimulation pulses subsequently generated at the desired stimulation pulse energy; and

    processing means for comparing post-stimulation signals sensed by the sensing means at the optimum setting with the respective polarization signal, whereby a prescribed difference signal sensed by the sensing means at the optimum sensitivity setting is used for capture detection on a beat-by-beat basis.

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