Method and apparatus for calculating arterial oxygen saturation

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

1989-08-04

1992-01-07

Howell, Kyle L.

Surgery

Truss

Pad

128666, A61B 502

Patent

active

050781367

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 filtering and compensating the detected optical signal using the filtered signal to provide accurate estimates of oxygen saturation during transient conditions.

REFERENCES:
patent: 4694833 (1987-09-01), Hamaguri
patent: 4759369 (1988-07-01), Tanlar
patent: 4800885 (1989-01-01), Johnson
patent: 4819646 (1989-04-01), Cheung et al.
patent: 4819752 (1987-10-01), Zelin
patent: 4859056 (1986-08-01), Prosser et al.

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