Patent ID: 7613487
Filing Date: 2009-11-03
Classification: A61B

Abstract:
1. An instrument for noninvasively measuring a blood sugar level comprising: an irradiation device configured to irradiate a measurement part of a human body with the light of two different wavelengths; a transmitted light quantity detecting device configured to receive transmitted light, which is the light from the irradiation device transmitted through the measurement part of the human body, at two positions spaced at different distances so as to detect the quantity of the transmitted light; and a calculation device configured to calculate coefficients k in which, of the quantities of the transmitted light detected at the two positions, the quantity of the light transmitted through a shorter distance is represented as I 1.λ1 and I 1.λ2 , the quantity of the light transmitted through a longer distance is represented as I 2.λ1 and I 2.λ2 , and the relative transmittances R λ1 and R λ2 of the two different wavelengths are represented by the following formulae: