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Optical device

  • US 7,221,970 B2
  • Filed: 02/14/2005
  • Issued: 05/22/2007
  • Est. Priority Date: 08/13/1998
  • Status: Expired due to Fees
First Claim
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1. A method for monitoring oxygenation of blood, comprising the steps of:

  • transmitting light containing a plurality of wavelengths into blood;

    measuring a remitted spectrum over the plurality of wavelengths;

    calculating a measured blood absorption spectrum from the remitted spectrum;

    estimating local rates of change in the measured blood absorption spectrum at a plurality of the wavelengths, including at least one isobestic wavelength; and

    ,calculating an estimate of SO2 as a function of absolute values of the local rates of change of the measured blood absorption spectrum.

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