Patent ID: 8024021
Filing Date: 2011-09-20
Classification: A61B

Abstract:
1. A method of measuring an oxygen saturation in blood of a subject, comprising: irradiating a living tissue of the subject with a first light beam having a first wavelength and a second light beam having a second wavelength different from the first wavelength; generating a first electrical signal from the first light beam reflected from or transmitted through the living tissue; generating a second electrical signal from the second light beam reflected from or transmitted through the living tissue; dividing the first electrical signal into a plurality of first segments each of which includes a part of the first electrical signal for a predetermined time period; dividing the second electrical signal into a plurality of second segments each of which includes a part of the second electrical signal for the predetermined time period; and calculating a gradient of a regression line between every one of the first segments and an associated one of the second segments, thereby obtaining a plurality of gradients.