Patent ID: 8055321
Filing Date: 2011-11-08
Classification: A61B

Abstract:
1. An apparatus for measuring tissue oxygenation of a person comprising: a sensor interface adapted to be coupled to a tissue site and including at least two light emitters configured to emit light into tissue and at least one detector configured to detect light passing through tissue from said at least two light emitters; a processor connected to the sensor interface and configured to determine light attenuations LAwsj dependent on light detected by the at least one detector at a selected wavelength, wsj, and configured to generate a signal representative of tissue oxygenation based on said light attenuations, the processor configured to generate the signal based on a calibration corresponding to the selected wavelength and corresponding to a detector emitter distance; a coupling device for coupling said sensor interface at said tissue site; and a display device coupled to the processor and configured to display a tissue oxygenation level based on the signal, the display device configured to be worn by the person, and wherein the tissue oxygenation level corresponds to oxygenation of venous blood in tissue; and wherein said processor is further configured to determine arterial oxygenation information based on a change in light attenuations; and wherein the processor is configured to perform a calculation including determining an addition of two light attenuations and determining a subtraction of two light attenuations.