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Apparatus for determining concentrations of hemoglobins

  • US 20020111748A1
  • Filed: 02/15/2002
  • Published: 08/15/2002
  • Est. Priority Date: 11/30/1999
  • Status: Active Grant
First Claim
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1. An apparatus for determining concentrations of hemoglobins comprising:

  • a light source for emitting lights of at least three different wavelengths, a first wavelength in a near-infrared wavelength region, a second wavelength in a red wavelength region, and a third wavelength in a red orange wavelength region;

    a light receiving means for receiving light emitted by the light source, transmitted through a living tissue or reflected by the living tissue;

    attenuation ratio processing means for processing attenuation ratios between the wavelengths in accordance with variations of received-light output signals in each of the wavelengths output from the light receiving means, the variations are caused by a pulsation of blood; and

    concentration ratio processing means for processing concentration ratios of at least oxyhemoglobin and methemoglobin based on the output signals from the attenuation ratio processing means.

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