BLOOD COMPONENT MEASURING DEVICE
First Claim
1. A blood component measuring device that irradiates a living body part with light and measures a blood component of the living body part, the blood component measuring device comprising:
- a holding mechanism that holds and fixes a position of the living body part;
at least one irradiation light source which emits at different times;
i) light at a first wavelength which is directed toward the living body part when the living body part is held in the holding mechanism;
ii) light at a second wavelength which is directed toward the living body part when the living body part is held in the holding mechanism; and
iii) light in a near-infrared region which is directed toward the living body part when the living body part is held in the holding mechanism, the light at the first wavelength being relatively easily absorbed by hemoglobin while the light at the second wavelength is relatively poorly absorbed by hemoglobin;
a light receiver which receives the light emitted by the irradiation light source;
an intensity calculator calculating a transmitted light intensity S1 at the first wavelength based on output from the light receiver and calculating a transmitted light intensity S2 at the second wavelength based on output from the light receiver;
a measurement site extractor which identifies as a measurement site a location on the living body part at which a ratio S1/S2 is a minimum; and
calculating means for calculating a concentration of the blood component at the measurement site of the living body part.
1 Assignment
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Accused Products
Abstract
A blood component measuring device includes an irradiation light source configured to emit light at least in a near-infrared region, a light receiver having such sensitivity as to receive light emitted by the irradiation light source, a holding mechanism that holds and fixes a living body part, and an arithmetic device that calculates the concentration of a blood component in the living body part. The calculating means calculates the concentration of the blood component about, of the living body part, a place where the ratio of transmitted light intensity at a first wavelength relatively easily absorbed by hemoglobin and transmitted light intensity at a second wavelength relatively poorly absorbed by hemoglobin is the minimum.
9 Citations
14 Claims
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1. A blood component measuring device that irradiates a living body part with light and measures a blood component of the living body part, the blood component measuring device comprising:
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a holding mechanism that holds and fixes a position of the living body part; at least one irradiation light source which emits at different times;
i) light at a first wavelength which is directed toward the living body part when the living body part is held in the holding mechanism;
ii) light at a second wavelength which is directed toward the living body part when the living body part is held in the holding mechanism; and
iii) light in a near-infrared region which is directed toward the living body part when the living body part is held in the holding mechanism, the light at the first wavelength being relatively easily absorbed by hemoglobin while the light at the second wavelength is relatively poorly absorbed by hemoglobin;a light receiver which receives the light emitted by the irradiation light source; an intensity calculator calculating a transmitted light intensity S1 at the first wavelength based on output from the light receiver and calculating a transmitted light intensity S2 at the second wavelength based on output from the light receiver; a measurement site extractor which identifies as a measurement site a location on the living body part at which a ratio S1/S2 is a minimum; and calculating means for calculating a concentration of the blood component at the measurement site of the living body part. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A blood component measuring device that irradiates a living body part with light and measures a blood component of the living body part, the blood component measuring device comprising an irradiation light source which emits light at least in a near-infrared region;
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a light receiver having sensitivity to receive light emitted by the irradiation light source; a holding mechanism that holds and fixes a position of the living body part; calculating means for calculating a concentration of the blood component in the living body part; the calculating means calculating the concentration of the blood component at a location of the living body part in which a ratio S1/S2 of transmitted light intensity S1 at a first wavelength which is relatively easily absorbed by hemoglobin and transmitted light intensity S2 at a second wavelength which is different from the first wavelength and which is relatively poorly absorbed by hemoglobin is a minimum. - View Dependent Claims (9, 10, 11, 12)
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13. A method of measuring a blood component of a living body part comprising:
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emitting, at a plurality of locations on the living body, light possessing a first wavelength which is relatively easily absorbed by hemoglobin; emitting, at the plurality of locations on the living body, light possessing a second wavelength which is relatively poorly absorbed by hemoglobin; calculating a light intensity S1 of the light possessing the first wavelength which has passed through the living body at the plurality of locations on the living body; calculating a light intensity S2 of the light possessing the second wavelength which has passed through the living body at the plurality of locations on the living body; determining as a measurement site the location on the living body part at which a ratio S1/S2 is a minimum; emitting light in a near-infrared region at the measurement site and receiving the light in the near-infrared region that has passed through the calculating means for calculating a concentration of the blood component at the measurement site of the living body part; and measuring the blood component of the living body part based on the light in the near-infrared region that has passed through the living body part at the measurement site. - View Dependent Claims (14)
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Specification