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Method and apparatus for implementing activity sensing in a pulse generator

  • US 5,052,388 A
  • Filed: 12/22/1989
  • Issued: 10/01/1991
  • Est. Priority Date: 12/22/1989
  • Status: Expired due to Term
First Claim
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1. In a cardiac pacemaker comprising a pulse generator for generating stimulus pulses, sensor means for sensing physiologic demand for oxygenated blood and for generating a sensor output variable between first and second levels and sensor processing circuitry for processing said sensor output and for controlling the rate of stimulus pulses generated by said pulse generator as a function of said sensor output, the improvement wherein:

  • said sensor processing means comprises means for independently selecting a first rate, a second rate and one of a plurality of predetermined sensor output levels between said first and second levels and means for defining a function relating the rate of stimulus pulses generated by said pulse generator to the output from said sensor, said stimulus pulse rate determined by said function increasing from said first rate when said sensor output is at said first level to said second rate when said sensor output is at said selected one of said plurality of predetermined sensor output levels.

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