Optical device
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United States of America Patent
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Jun 26, 2007
Grant Date -
May 12, 2005
app pub date -
Nov 22, 2004
filing date -
Aug 13, 1998
priority date (Note) -
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status (Latency Note)
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Abstract
A method for monitoring blood oxygen saturation (SO.sub.2) includes the steps of calculating an estimate of SO.sub.2 in the blood and correcting the estimate by a scaling factor. A preferred embodiment of the method includes the steps of transmitting light containing a plurality of wavelengths into the 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; and calculating the estimate of SO.sub.2 as a function of absolute values of the local rates of change of the measured blood absorption spectrum.
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