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Rate responsive cardiac pacemaker with peak impedance detection for rate control

  • US 5,782,884 A
  • Filed: 11/05/1996
  • Issued: 07/21/1998
  • Est. Priority Date: 11/05/1996
  • Status: Expired due to Term
First Claim
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1. An implantable cardiac stimulation apparatus comprisinga hermetically sealed container, said container having therein a battery, andcontrol circuitry powered by said battery, said control circuitry comprising means for producing an output to stimulate a patient'"'"'s heart;

  • means for measuring impedance within the patient'"'"'s body and producing a first signal correlated to said impedance;

    means for producing a first derivative of said first signal;

    means for detecting a zero-crossing of said first derivative;

    means for timing an interval from said output to said zero-crossing; and

    means for controlling said means for producing said output as a function of said interval.

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