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Shutterless mainstream discriminating anesthetic agent analyzer

  • US 5,296,706 A
  • Filed: 12/02/1992
  • Issued: 03/22/1994
  • Est. Priority Date: 12/02/1992
  • Status: Expired due to Term
First Claim
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1. A device for simultaneously measuring the concentrations of respective anesthetic agents in a respiratory gas stream, comprising:

  • a source of infrared radiation;

    a separate infrared detector for each of said respective anesthetic agents, each detector disposed so as to receive incident radiation from said infrared radiation source and to produce first electrical signals representative of the received incident radiation and ambient temperature transients;

    means for directing at least a portion of said respiratory gas stream between said infrared detectors and said infrared radiation source;

    a separate reference infrared detector for each of said infrared detectors, each reference detector being connected in parallel opposed manner with its corresponding infrared detector and outputting second electrical signals representative of ambient temperature transients;

    means for shielding said reference detectors from said infrared radiation source; and

    means for processing said first and second electrical signals to produce signals representative of the concentrations of said respective anesthetic agents.

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