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Automatic stimulus artifact reduction for accurate analysis of the heart's stimulated response

  • US 5,172,690 A
  • Filed: 10/26/1990
  • Issued: 12/22/1992
  • Est. Priority Date: 10/26/1990
  • Status: Expired due to Term
First Claim
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1. An apparatus, adapted to be implanted in a patient, for electrically stimulating the heart and analyzing the heart'"'"'s stimulated response, comprising:

  • means for generating triphasic cardiac stimulation pulses having a first and third phase of one polarity and a second phase of the opposite polarity,means for timing the generation of said triphasic cardiac stimulation pulses so that at least one pulse occurs during the refractory period of the heart in each of a plurality of cardiac cycles,means operative during the refractory period of the heart for measuring a stimulation polarization artifact resulting from the generation of said triphasic cardiac stimulation pulses, andmeans operative to adjust the amplitude and polarity of the current flow during at least one phase of each of said triphasic cardiac stimulation pulses for reducing the amplitude of said stimulation polarization artifact.

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