Patent ID: 6236047
Filing Date: 2001-05-22
Classification: A61B,G01N

Abstract:
A method of determining the concentration of an organic blood analyte in a body tissue sample, comprising:(a) selecting a plurality of distinct, nonoverlapping spectral regions within an infrared spectrum, wherein each of the spectral regions encompass a range of wavelengths between approximately 1100 and 5000 nanometers, and wherein at least a portion of each spectral region has high correlation to the concentration of the analyte;(b) irradiating the sample with light having a wavelength in each spectral region to obtain radiation reflected from and modified by contact with the sample in each spectral region;(c) optically filtering the reflected modified radiation to isolate or emphasize a portion of the radiation from each spectral region;(d) collecting and measuring the intensity of the optically filtered radiation using a detector means; and(e) obtaining a value indicative of the analyte concentration by applying a mathematical model to the optically filtered radiation.