Method and apparatus for calculating arterial oxygen saturation based plethysmographs including transients
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United States of America Patent
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Jan 7, 1992
Issued Date -
N/A
app pub date -
Aug 4, 1989
filing date -
Mar 30, 1988
priority date (Note) -
Expired
status (Latency Note)
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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.
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