Optical device
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Abstract
A method for monitoring oxygenation of blood includes the steps of transmitting light containing a plurality of wavelengths into blood and measuring a remitted spectrum over the plurality of-wavelengths. A measured blood absorption spectrum is then calculated from the remitted spectrum and local rates of change in the measured blood absorption spectrum are estimated at a plurality of the wavelengths, including at least one isobestic wavelength. An estimate of blood oxygen saturation (SO2) is calculated as a function of absolute values of the local rates of change of the measured blood absorption spectrum.
8 Citations
37 Claims
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1-32. -32. (canceled)
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33. A method for monitoring oxygenation of blood, comprising the steps of:
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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. - View Dependent Claims (34, 35, 36, 37)
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Specification