Patent ID: 8391939
Filing Date: 2013-03-05
Classification: A61B,A61M

Abstract:
1. A method for the continuous measurement of glucose level in blood undergoing pulsing flow, the method comprising the steps of: determining a value for the glucose level in succeeding and nonoverlapping time windows of the same length of a first measurement cycle; repeating the determination of this value in subsequent measurement cycles with the same number of nonoverlapping time windows of the same length such that there is multiple detection within each measurement cycle of the transmission or scattering power of the blood for at least two incident NIR wavelengths, calculation of an indicator value dependent on the blood-glucose level and ascertaining the blood-glucose level by comparing the indicator value with a previously determined calibration table; determining ensemble averages for all the time windows of each measurement cycle; determining the blood temperature during the detection of the transmission and/or scattering power, continuously measuring the pulse duration of the pulsing blood flow, the duration of the measurement cycle being set to keep in step as integral multiple of the pulse duration, selecting the first of the two NIR wavelengths from the wavelength range 1560-1630 nm, and the second of the NIR wavelengths from the wavelength range 790-815 nm, and using the ratio of the transmission or scattering power of the two wavelengths relative to the blood temperature as an indicator value for reading off the blood-glucose level from the calibration table.