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Cardiac pacemaker

  • US 4,867,162 A
  • Filed: 03/17/1987
  • Issued: 09/19/1989
  • Est. Priority Date: 09/17/1985
  • Status: Expired due to Term
First Claim
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1. A cardiac pacemaker comprising:

  • first measured value pickup means for detecting a first attribute of a patient'"'"'s body and producing a first output signal representative of said first attribute;

    second measured value pickup means for detecting a second attribute of a patient'"'"'s body and producing a second output signal;

    circuitry means for varying at least one pacing parameter, in particular the pacing rate, as a function of said first output signal and said second output signal picked up in the patient'"'"'s body and which are associated with physical exertion of the patient'"'"'s body;

    means for providing stimulation to a patient'"'"'s body in response to said pacing rate;

    calibration means for calibrating an initial output signal detected by said first measured pickup means and for producing a calibrated output signal in response thereto;

    compensation means connected to receive output signals from said first measured value pickup means for adjusting said first output signal so as to produce a compensated output signal in response to said first output signal as said calibrated output signal, and during a predetermined period of time said second output signal is substantially identical with said calibrated output signal obtained from said first measured value pickup means, and said compensation means remain substantially unchanged for a following operating period of time.

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