Patent ID: 6804002
Filing Date: 2004-10-12
Classification: A61B,G01N

Abstract:
A method of optical measurements for use in determining the concentration of a substance in a patient's blood, the method comprisingcreating a state of blood flow cessation at the measurement location by applying pressure to a location on the blood containing medium upstream of said measurement location with respect to the blood flow direction, and maintaining said state for a certain cessation time, during a certain time period including said certain cessation time, performing optical measurement sessions on the measurement location by illuminating the measurement location with incident light of at least one selected wavelength, detecting, at each measurement session, at least two light responses of the medium characterized by at least two different polarization states of detected light, respectively, and generating data representative thereof; and obtaining measured data in the form of at least two time variations of the light responses of the medium, a relation between the time variations of the light responses being indicative of the concentration of the substance in blood.