EQUIPMENT FOR IN VIVO DATA ACQUISITION AND ANALYSIS

• US 20130261413A1
• Filed: 10/14/2010
• Published: 10/03/2013
• Est. Priority Date: 10/14/2010
• Status: Abandoned Application

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Kawahara, Takayuki, Takemura, Riichiro, Sonehara, Tsuyoshi, Nagasaka, Akio
• Application Number:
  US13/878,878
• Publication Number:
  US 20130261413A1
• Time in Patent Office: Days
• US Class Current: 600/316
• CPC Class Codes: A61B 5/14532 for measuring glucose, e.g. by tissue impedance measurement
• CPC Class Codes: A61B 5/1455 using optical sensors, e.g. spectral photometrical oximeters

Abstract

To obtain a blood sugar level accurately, the location of a blood-vessel part is specified by using a first wavelength at which absorption by hemoglobin, which is a component unique to blood, is high, and data of light absorbance measured by using a second wavelength at which absorption by glucose is high is separated into a blood-vessel part and other parts.

Claims

1. A device for acquiring and analyzing biological information comprising:

a first light source radiating light having a first wavelength;

a second light source radiating light having a second wavelength;

a photosensor array detecting outgoing light from a living body irradiated with the light from the first light source and the second light source; and

an analyzer analyzing data from the photosensor array,

the analyzer specifying a region, as a blood-vessel part, in which intensity of outgoing light from the living body irradiated with the light having the first wavelength exceeds a predetermined threshold value, separating the data based on the intensity of outgoing light from the living body irradiated with the light having the second wavelength into data of the specified region and data of other regions, and subjecting the data to analysis.

2. The device for acquiring and analyzing biological information according to claim 1,

wherein the first wavelength is a wavelength between 810 nm to 940 nm;

and

the second wavelength is a wavelength between 1500 nm to 1700 nm.

3. The device for acquiring and analyzing biological information according to claim 1,

wherein the light having the first wavelength and the second wavelength is near infrared light;

the first wavelength is in a wavelength band in which absorption by hemoglobin is relatively high; and

the second wavelength is in a wavelength band in which absorption by glucose is relatively high.

4. The device for acquiring and analyzing biological information according to claim 1,

wherein the intensity of the outgoing light from the living body irradiated with the light having the second wavelength depends on at least amounts of a first substance and a second substance;

the device has a mechanism that radiates light having a plurality of wavelengths from a wavelength band centered on a range allowable as the second wavelength;

the analyzer obtains dependency of the intensity of the outgoing light and a radiated wavelength from intensity data of the outgoing light from the living body irradiated with the light having the plurality of wavelengths; and

the first substance and the second substance contained in the blood-vessel part are separated from each other based on the dependency.

5. The device for acquiring and analyzing biological information according to claim 4, comprising,

as the mechanism, a plurality of filters each allowing passage of light of a predetermined wavelength band from the second light source.

6. The device for acquiring and analyzing biological information according to claim 1,

wherein, in the photosensor array, photosensor cells are arranged in a two-dimensional matrix;

the photosensor cells each include a first photosensor cell that has a first diode and a second photosensor cell that has a second photodiode;

the first photosensor cell and the second photosensor cell are arranged to be mutually adjacent in the photosensor array;

the first photodiode has higher sensitivity to the first wavelength compared with that of the second photodiode; and

the second photodiode has higher sensitivity to the second wavelength compared with that of the first photodiode.

7. The device for acquiring and analyzing biological information according to claim 6,

wherein the first photodiode uses electron-hole pair generation by Si caused by light;

and

the second photodiode uses electron-hole pair generation by Ge caused by light.

8. The device for acquiring and analyzing biological information according to claim 1, comprising

a mechanism that radiates the light of the light source from a lateral surface of the living body.

9. The device for acquiring and analyzing biological information according to claim 1, further comprising

a third light source radiating light having a third wavelength,

wherein the photosensor array is composed of a photosensor cell having a photodiode using electron-hole pair generation by Si caused by light;

and

the third light source emits light in synchronization with the second light source.

10. The device for acquiring and analyzing biological information according to claim 1,

wherein the photosensor array has a first photosensor array and a second photosensor array in which photosensor cells are one-dimensionally arranged;

the first photosensor array has a first photosensor cell having a first photodiode;

the second photosensor array has a second photosensor cell having a second photodiode;

the first photodiode has higher sensitivity to the first wavelength compared with that of the second photodiode;

the second photodiode has higher sensitivity to the second wavelength compared with that of the first photodiode; and

the first and second photosensor arrays are caused to scan a predetermined range of the living body.

11. The device for acquiring and analyzing biological information according to claim 10, comprising

a half mirror,

the half mirror causing the light having the first wavelength to be received by the first photosensor array and causing the light having the second wavelength to be received by the second photosensor array.