Optical measurement apparatus and blood sugar level measuring apparatus using the same
First Claim
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1. An optical measurement apparatus comprising:
- a first light source for producing light of a first wavelength that is irradiated onto a light incident point on the surface of an examined subject;
a second light source for producing light of a second wavelength that is irradiated onto said light incident point on the surface of said subject from a direction different from that of the light of said first wavelength;
a first photodetector on which reflected light of the light of said first wavelength reflected by said light incident point and scattered light of the light of said second wavelength are incident;
a second photodetector for receiving reflected light of the light of said second wavelength reflected by said light incident point and scattered light of the light of said first wavelength; and
a third detector for receiving light leaving out of a region on the surface of said subject that is away from said light incident point.
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Abstract
Blood sugar levels are measured non-invasively based on temperature measurement. Values of blood sugar levels non-invasively measured by a temperature measuring system are corrected using blood oxygen saturation and blood flow volume. Optical sensors are provided for detecting scattered light, reflected light, and light that enters into the skin which travels out of the body surface. The measurement data is stabilized by taking into consideration the influence of the thickness of skin on blood oxygen saturation.
47 Citations
21 Claims
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1. An optical measurement apparatus comprising:
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a first light source for producing light of a first wavelength that is irradiated onto a light incident point on the surface of an examined subject;
a second light source for producing light of a second wavelength that is irradiated onto said light incident point on the surface of said subject from a direction different from that of the light of said first wavelength;
a first photodetector on which reflected light of the light of said first wavelength reflected by said light incident point and scattered light of the light of said second wavelength are incident;
a second photodetector for receiving reflected light of the light of said second wavelength reflected by said light incident point and scattered light of the light of said first wavelength; and
a third detector for receiving light leaving out of a region on the surface of said subject that is away from said light incident point. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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2. An optical measurement apparatus comprising a first light source for producing light of a first wavelength, a second light source for producing light of a second wavelength, a first photodetector, a second photodetector and a third photodetector, wherein
said first and second light sources emit light in a time-divided manner such that a light incident point on the surface of an examined subject is irradiated with the light of said first wavelength and the light of said second wavelength in a time-divided manner, mainly reflected light of the light of said first wavelength is incident on said first photodetector from said light incident point when said first light source is emitting, while mainly scattered light of the light of said second wavelength is incident thereon when said second light source is emitting, mainly reflected light of the light of said second wavelength is incident on said second photodetector from said light incident point when said second light source is emitting, while mainly scattered light of the light of said first wavelength is incident thereon when said first light source is emitting, and said third photodetector is adapted to receive light that leaves out of a region on the surface of said subject which is away from said light incident point.
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13. A blood sugar level measuring apparatus comprising:
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(1) a heat amount measuring portion for measuring a plurality of temperatures derived from the body surface in order to obtain information that is used in calculating the amount of convective heat transfer and the amount of radiation heat transfer related to the dissipation of heat from the body surface;
(2) a blood flow volume measuring portion for obtaining information concerning the volume of blood flow;
(3) an optical measuring portion for obtaining the hemoglobin concentration and hemoglobin oxygen saturation in blood, said portion including a light source for generating light of at least two different wavelengths, an optical system for irradiating the body surface with light emitted by said light source, and at least three different photodetectors for detecting the light that has been shone on the body surface;
(4) a storage portion for storing the relationships between individual parameters corresponding to the multiple temperatures, blood flow volume, hemoglobin concentration and hemoglobin oxygen saturation in blood, and blood sugar levels;
(5) a computing portion for converting the measurement values provided by said heat amount measuring portion, said blood flow volume measuring portion, and said optical measuring portion into the aforementioned parameters, and computing a blood sugar level by applying said parameters to said relationships stored in said storage portion; and
(6) a display portion for displaying the blood sugar level computed by said computing portion, wherein said optical measuring portion includes a first light source producing light of a first wavelength and emitting the light on a light incident point on the subject surface, a second light source producing light of a second wavelength and emitting the light on said light incident point on the subject surface from a direction different from that of the light of said first wavelength, a first photodetector, a second photodetector, and a third photodetector, wherein reflected light of the light of said first wavelength reflected by said light incident point and scattered light of the light of said second wavelength are incident on said first photodetector;
reflected light of the light of said second wavelength reflected by said light incident point and scattered light of the light of said first wavelength are incident on said second photodetector; and
said third photodetector is adapted to detect light that leaves out of a region on the subject surface that is away from said light incident point. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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Specification