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System for measuring the saturation of at least one gas, particularly the oxygen saturation of blood

  • US 5,299,570 A
  • Filed: 08/12/1992
  • Issued: 04/05/1994
  • Est. Priority Date: 08/12/1991
  • Status: Expired due to Term
First Claim
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1. A system for measuring a saturation of at least one gas in blood present in a living body, comprising:

  • light radiating means for generating light having various wavelengths;

    a sensor intended to rest on the body, the sensor having a light radiating zone where the light having various wavelengths is emitted from the sensor into the body, and light receiving zones located at various distances from the light radiating zone;

    light receiving means for detecting the intensity of light which is scattered back by the body and which reaches each light receiving zone; and

    circuit means, connected to the light receiving means, for detecting the at least one gas saturation from light intensities detected for the various wavelengths, the circuit means including selection and evaluation means for selecting one evaluation zone among the light receiving zones on the basis of a predetermined criterion, and for evaluating light reaching the light receiving means only in the selected evaluation zone in order to detect the at least one gas saturation.

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