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Apparatus for automatically monitoring body functions

  • US 4,403,215 A
  • Filed: 04/17/1981
  • Issued: 09/06/1983
  • Est. Priority Date: 12/27/1977
  • Status: Expired due to Fees
First Claim
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1. A respiration indicator comprising:

  • operator-actuated switch means having at least two states;

    impedance pneumograph means for determining an impedance signal related to changes in impedance of a living subject;

    threshold means responsive to the operator-actuated switch means for producing a signal indicative of the average value of the impedance signal during a base period interval; and

    comparator means for indicating an inspiration when the ratio between the threshold value signal and the impedance signal exceeds a predetermined proportionality factor.

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