Method of enhancing performance in pulse oximetry via electrical

Details Method of enhancing performance in pulse oximetry via electrical Method of enhancing performance in pulse oximetry via electrical

1998-04-22

1999-06-29

O'Connor, Cary

Surgery

Diagnostic testing

Measuring or detecting nonradioactive constituent of body...

600322, 600473, 600476, A61B 500

Patent

active

059161540

ABSTRACT:
An improved method for optically measuring a characteristic of a patient's blood or tissue is provided which involves first passing an arterialization current (typically from about 1-10 mA AC or DC) through a relatively short tissue segment of a patient (up to about 12 inches) for a period of time sufficient to significantly increase blood flow, whereupon a transcutaneous optical measurement is made. The method is especially suited for pulse oximetry and permits more accurate readings owing to the increased amplitude of the detection signal. In another embodiment, a probe molecule composition may be initially applied to the patient's skin, and the arterialization current is used to rapidly and evenly diffuse the probe molecule into the tissue segment. An appropriate sensor can then be employed for detecting the probe molecule.

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