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Electronic circuit for monitoring respiratory parameter for controlling operation of implantable medical device

  • US 4,576,183 A
  • Filed: 09/17/1984
  • Issued: 03/18/1986
  • Est. Priority Date: 09/21/1983
  • Status: Expired due to Term
First Claim
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1. An electronic circuit for detecting a respiratory parameter in a device which is implantable in a patient'"'"'s body and which is operable in response to such respiratory parameter, said circuit comprising:

  • a measurement and impedance/voltage conversion unit for detecting the impedance of a part of the patient'"'"'s body where the impedance varies in dependence on respiration, said unit including sampling means which effects sampling of the impedance during discrete sampling times occurring at selected time intervals, and means for producing an output signal representative of the sampled impedance values;

    signal processing circuit means connected to said unit for producing, in response to the output signal from said unit, a clean, regular signal representative of deviations of the impedance from a selected base impedance value, said signal processing circuit means comprising signal processing means operable for causing the clean, regular signal to vary between two selected amplitude values each time that, and only when, the difference between successive peak values of the output signal exceeds a selected value; and

    means for deriving from the clean, regular signal a control signal for controlling the operation of the implantable device.

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