Method and apparatus for in vivo blood constituent analysis

Details Method and apparatus for in vivo blood constituent analysis Method and apparatus for in vivo blood constituent analysis

1996-09-19

1998-07-21

Bahr, Jennifer

Surgery

Diagnostic testing

Measuring or detecting nonradioactive constituent of body...

600323, 600336, A61B 500

Patent

active

057827567

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.

REFERENCES:
patent: 5645060 (1997-07-01), Yorkey

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