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Oxygen-saturation measuring apparatus

  • US 20020173706A1
  • Filed: 12/14/2001
  • Published: 11/21/2002
  • Est. Priority Date: 04/05/2001
  • Status: Abandoned Application
First Claim
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1. An apparatus for measuring an oxygen saturation of a living subject, comprising:

  • a light source which emits, toward a tissue of the subject, a first light having a first wavelength whose absorption coefficient with respect to hemoglobin changes depending upon oxygen saturation, and a second light having a second wavelength whose absorption coefficient with respect to hemoglobin does not change depending upon oxygen saturation;

    a light sensor which detects a secondary light resulting from the first light, and a secondary light resulting from the second light, and produces a first light signal representing the detected secondary light of the first light, and a second light signal representing the detected secondary light of the second light; and

    an oxygen-saturation determining means for determining the oxygen saturation of the subject, based on a ratio of a magnitude of one of the first and second light signals to a magnitude of the other of the first and second light signals, according to a predetermined linear relationship between oxygen saturation and signal-magnitude ratio, wherein the first wavelength falls in a range of from 720 nm to 740 nm and the second wavelength falls in a range of from 800 nm to 840 nm.

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