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Rate responsive cardiac pacemaker

  • US 5,014,704 A
  • Filed: 04/27/1990
  • Issued: 05/14/1991
  • Est. Priority Date: 09/12/1986
  • Status: Expired due to Term
First Claim
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1. An implantable variable rate pacemaker adaptive to patient exercise, comprisingmeans for detecting movements of the patient;

  • means discriminating between those of said detected movements which are indicative of physical exercise by the patient and those of said detected movements which are attributable to other than physical exercise for producing an electrical signal substantially limited to and representative of said detected movements indicative of physical exercise, with a variable amplitude-determined value related to the instantaneous level of physical exercise;

    means responsive to said amplitude-determined value of said electrical signal for maintaining the rate of said pacemaker at a base rate corresponding to a predetermined resting rate at times when said amplitude-determined value is less than a preestablished threshold value representative of a first level of physical exercise and for increasing the rate of said pacemaker to a rate higher than said base rate consistent with said first level of exercise when said amplitude-determined value exceeds said threshold value; and

    means further responsive to said threshold value having been exceeded by said amplitude-determined value for setting said threshold value as the new baseline and setting a new higher threshold value representative of a second level of physical exercise which when exceeded by said amplitude-determined value will increase the rate of said pacemaker to a still higher rate consistent with said second level of physical exercise.

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