Patent ID: 6466807
Filing Date: 2002-10-15
Classification: A61B

Abstract:
A device for measuring concentration of an analyte in blood comprising a transmitter for illuminating a body part with light at a plurality of predetermined wavelengths; a detector for receiving light from said body part and generating input signals representative of the intensity of the received light at each said wavelength; and a computer coupled to the detector for generating an output signal representative of the concentration of the analyte in the blood in said body part by analysis of input signals received from the detector, wherein the output signal So is generated from the following formula: So=log&it;IBIA-ICIAwhere IA is representative of the intensity of received light at wavelength A at which the transmissivity of the blood is unaltered by the analyte;IB is representative of the intensity of received light at wavelength B at which the transmissivity of the blood is increased by the analyte; IC is representative of the intensity of received light at wavelength C at which the transmissivity of the blood is reduced by the analyte; and C>B>A.