Patent ID: 6122536
Filing Date: 2000-09-19
Classification: A61B,A61M

Abstract:
A device for sensing in-vivo the level of at least one constituent of blood within mammalian vascular tissue, comprising at least one implantable source of radiation from infrared through visible light, the source emitting radiation in at least two selected frequency bands, the at least one implantable source of radiation being arranged to direct the radiation at blood within the tissue and being located out of direct contact with the blood, the radiation being affected by direct interaction with the blood,at least one implantable detector adapted to be located out of direct contact with the blood and adapted to be located with respect to the tissue to receive radiation affected by the direct interaction with the blood,means associated with the source and the detector for deriving from the detector an output signal containing spectral information about the blood within the at least two selected frequency bands, anda processor for processing the output signal to derive the level of the blood constituent.