Method and apparatus for calculating arterial oxygen...

Details Method and apparatus for calculating arterial oxygen... Method and apparatus for calculating arterial oxygen...

A - Human Necessities

61

B

354/22, 326/13.5

A61B 5/00 (2006.01)

Patent

CA 1327402

-51- Abstract A method and apparatus for improving the calculation of oxygen saturation by non-invasive pulse oximeters during transient conditions. Transient conditions introduce artifactual errors into the detected optical signal because of changes in transmittance of the light with localized blood volume changes and as the average background oxygen saturation level of the patient's blood changes. The invention relates to correcting the detected optical pulses by linear interpolation and rate of change techniques or by selective frequency filter- ing and compensating the detected optical signal using the filtered signal to provide accurate esti- mates of oxygen saturation during transient condi- tions.

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