Patent ID: 8437821
Filing Date: 2013-05-07
Classification: A61B

Abstract:
1. A non-invasive body information measurement apparatus comprising: a light source; a body information sensor that measures body information; a characteristic quantity detector that analyzes the body information measured by the body information sensor and calculates a characteristic quantity for the body information; a blood glucose level estimator that finds an estimated blood glucose level from the characteristic quantity calculated by the characteristic quantity detector and a measured blood glucose level measured by an invasive blood glucose measurement apparatus; and a controller that (i) during a calibration period performs measurement of the body information at a plurality of luminous energy levels and calculates a plurality of the estimated blood glucose levels from (a) a plurality of the characteristic quantities calculated at various luminous energy levels of the plurality of luminous energy levels and (b) the measured blood glucose levels measured by the invasive blood glucose measurement apparatus, (ii) at an end of the calibration period compares the plurality of the estimated blood glucose levels with the measured blood glucose levels measured by the invasive blood glucose measurement apparatus, and (iii) during a normal measurement period controls the light source so that measurement is performed at the plurality of luminous energy levels corresponding to the estimated blood glucose levels that satisfy a targeted accuracy, wherein the controller includes a luminous energy level modifier that controls a luminous energy level of the plurality of luminous energy levels according to a luminous energy level command signal outputted from the blood glucose level estimator.