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Apparatus for determining the concentration of a light-absorbing material in blood

  • US 4,832,484 A
  • Filed: 10/29/1987
  • Issued: 05/23/1989
  • Est. Priority Date: 10/29/1986
  • Status: Expired due to Term
First Claim
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1. An apparatus for determining the concentration of a light-absorbing material in blood based on a differential amount of transmission of light of different wavelengths passing through a living tissue due to blood pulsations, said apparatus comprising:

  • a light intensity detector for detecting the intensity of said light passing through said tissue;

    time point detecting means for detecting, for each wavelength of light, a plurality of points in time that fall in the vicinity of one peak and one trough of a detection signal produced by said light intensity detector;

    memory means for storing, for each wavelength of light, values of said detection signals produced at each of said points in time as detected by said time point detecting means; and

    concentration computing means for computing a concentration of a light-absorbing material in blood in said tissue in response to the values of said detection signals stored by said memory means.

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