Rate responsive cardiac pacemaker

  • US 5,031,615 A
  • Filed: 05/02/1990
  • Issued: 07/16/1991
  • Est. Priority Date: 09/12/1986
  • Status: Expired due to Term
First Claim
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1. An activity-sensing cardiac pacemaker for implantation in a patient, comprisinga case housing at least a portion of the pacemaker,activity sensor means situated within said case for detecting movements of the patient, said activity sensor means includingminiaturized accelerometer means integrated within hybrid electronic circuitry to distinguish between movements of the type which are attributable to physical exercise of the patient and movements of the type produced by spasmodic reaction to internal and external forces on the patient which are not attributable to physical exercise of the patient, for generating an electrical signal having a level representative of the level of physical exercise in which the patient is engaged,adjustable rate pulse generating means within said case for stimulating the patient'"'"'s heart, andrate selecting means within said case, responsive to said electrical signal level, for adjusting the pulse rate of said pulse generating means to stimulate the patient'"'"'s heart at a rate which is physiologically appropriate to the level of physical exercise of the patient.

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