Method and apparatus for in vivo blood constituent analysis
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United States of America Patent
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Jul 21, 1998
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N/A
app pub date -
Sep 19, 1996
filing date -
Sep 19, 1996
priority date (Note) -
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Abstract
The present invention utilizes at least three wavelengths of electromagnetic radiation for determining a blood constituent, such as arterial oxygen saturation, in a patient. The detected radiation scattered by the tissue of the patient is analyzed in a manner that compensates for variations in the detected radiation caused by differences in the scattering of the radiation at different wavelengths. In particular, a result is determined which is equivalent to the sum of a first blood constituent estimate using a first pair of the detected signals, and the difference between the first blood constituent estimate and a second blood constituent estimate, using a different pair of wavelengths, with the difference being multiplied by a multiplicative factor.
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