System for pulse oximetry SPO.sub.2 determination

Details System for pulse oximetry SPO.sub.2 determination System for pulse oximetry SPO.sub.2 determination

1994-11-01

1996-04-02

Sykes, Angela D.

Surgery

Truss

Pad

356 41, A61B 500

Patent

active

055031480

ABSTRACT:
The improved pulse oximeter preprocesses the sets of red and infrared signals received from the probe. The set of pairs of processed red and infrared data points are fitted to a linear equation to compute the slope of the best fit line through these data points and account for noise in both of these sets of data points. A measure of the linearity of the input data points, if less than a predetermined threshold, indicates that a distorted signal has been received from the probe. The computed slope of the best fit line is converted to a RRatio which is used in a empirical calibration formula to compute the average SpO.sub.2 value.

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