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Rate responsive cardiac pacemaker

  • US 4,926,863 A
  • Filed: 09/10/1987
  • Issued: 05/22/1990
  • Est. Priority Date: 09/12/1986
  • Status: Expired due to Term
First Claim
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1. A rate responsive cardiac pacemaker for implantation in a patient, comprisingactivity sensor means for converting mechanical movements of the patient to an electrical signal representative thereof,means responsive to said electrical signal for passing only a portion thereof in a frequency range below 4 Hz to discriminate against signal components arising from other than physical activity of the patient,processing means responsive to the passed portion of the signal to recover therefrom a predetermined variable signal component other than frequency of amplitude crossings relative to a threshold value, for producing an output signal representative of true physical body activity, andmeans responsive to said output signal for generating pulses at a rate that varies depending on said predetermined signal component to stimulate the patient'"'"'s heart at a rate according to the state of true physical body activity of thee patient.

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