Patent ID: 6931268
Filing Date: 2005-08-16
Classification: A61B

Abstract:
1. A system for non-invasively monitoring concentrations of blood constituents in a living subject, said system comprising: a light source configured to irradiate a fleshy medium at one location with radiation at a plurality of wavelengths, each wavelength selected for attenuation sensitivity to at least one of a plurality of blood constituent concentrations, said plurality of blood constituent concentrations including a glucose concentration; an active pulse inducement device which causes a periodic change in a volume of blood in the fleshy medium with the level of inducement below a level that causes significant variations in the optical properties of the fleshy medium; an optical detector positioned to detect light which has been attenuated by said fleshy medium at said one location, said optical detector configured to generate an output signal indicative of the intensity of said radiation after attenuation through said fleshy medium at said one location; and a signal processor responsive to said output signal to analyze said output signal to extract portions of said signal due to optical characteristics of said blood to determine the concentration of at least one selected constituent within said subject's bloodstream.