US 6,149,588 A · Blood sugar value measuring method and apparatus

Abstract

Near infrared rays of .lambda.1, .lambda.2, .lambda.3 in wavelength which are different from and near to one another are irradiated from a light source (2) to a part being measured (F) of a living body in such a state that vein bloodstream at the part being measured is stopped by applying a press force of a cuff (8), and the intensities of the transmitted near infrared rays of .lambda., .lambda.2, .lambda.3 in wavelength are detected by a photodetector (4) at the same time. In a processing circuit (14), the absorbance secondary differential value of the near infrared rays by the part being measured (F) is calculated on the basis of the transmitted light intensity detection values thus detected at the same time with respect to the three wavelengths, the variation width thereof within a predetermined time is calculated and then the blood sugar value in the living body is determined from the absorbance secondary differential value variation width on the basis of a calibration curve.

Claims12

Dependent claims

A blood sugar value measuring method comprising the steps of exposing a part being measured of a living body to near infrared rays having three wavelengths which are different from one another, but near to one another:

detecting the intensities of the near infrared rays of the three wavelengths transmitted through the part being measured:
calculating the secondary differential value of the absorbance of the near infrared rays of the part being measured from the intensity detection values of the near infrared rays with respect to the three wavelengths;
determining the variation width of the secondary differential value of the absorbance as the difference between the maximum and minimum values of the secondary differential value of the absorbance within a predetermined time;
and
determining the blood sugar value of the living body on the basis of the variation width of the secondary differential value of the absorbance.

2 more elements

A blood sugar value measuring apparatus for exposing a part being measured of a living body to near infrared rays having three wavelengths which are different from one another, but near to one another, detecting the intensities of the near infrared rays of the three wavelengths transmitted through the part being measured and then determining the blood sugar value of the living body on the basis of the near infrared rays intensity detection values with respect to the three wavelengths, comprising:

a light source for emitting near infrared rays of three wavelengths;
a photodetector for detecting the transmitted near infrared rays of three wavelengths transmitted through the living body;
and
processing means for performing processing based on the transmitted near infrared rays detection values with respect to the three wavelengths obtained by said photodetector to calculate the secondary differential value of the absorbance of the near infrared rays at the part being measured, determining the variation width of the absorbance secondary differential value as the difference between the maximum and minimum values of the absorbance secondary differential value within a predetermined time, and determining the blood sugar value of the living body by using a calibration curve based on the variation width of the absorbance secondary differential value.

1 more element

Dependencies are inferred from the claim text.

Blood sugar value measuring method and apparatus

Life of this patent

Blood sugar value measuring method and apparatus

Life of this patent

Abstract

Claims12