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Pulse and active pulse spectraphotometry

  • US 20030220576A1
  • Filed: 02/21/2003
  • Published: 11/27/2003
  • Est. Priority Date: 02/22/2002
  • Status: Active Grant
First Claim
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1. A pulse spectraphotometry system comprising:

  • a light source adapted to illuminate a tissue site with optical radiation having a plurality of wavelengths selected from at least one of a primary band and a secondary band, said tissue site having a modulated blood volume;

    a detector configured to receive said optical radiation attenuated by said tissue site and to generate a detector output responsive to absorption of said optical radiation within said tissue site;

    a normalizer operating on said detector output to generate a plurality of normalized plethysmographs corresponding to said plurality of wavelengths; and

    a processor configured to calculate a ratio of fractional volumes of analytes in said blood volume based upon said normalized plethysmographs.

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