Patent ID: 7865223
Filing Date: 2011-01-04
Classification: A61B

Abstract:
1. An apparatus for determining blood oxygenation in a tissue, the apparatus comprising: a sensor interface having a first emitter and a second emitter configured to emit light into the tissue and having a first detector and a second detector configured to detect light from the tissue, wherein an emitter-detector distance is selected to provide a light path that travels through the tissue at a depth of penetration that includes a selected region of the tissue; a processor configured to: determine light attenuation LA(A determine light attenuation LA(A determine light attenuation LA(A determine light attenuation LA(A determine an optical characteristic of said tissue based on a resulting light attenuation LAwsj at said wavelength wsj, the resulting light attenuation determined by summing the light attenuations of LA(A an output device coupled to the processor and configured to receive the optical characteristic.