Blood sugar level measuring apparatus
First Claim
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1. A blood sugar level measuring apparatus comprising:
- a heat amount measurement portion for measuring a plurality of temperatures deriving from a body surface and obtaining information used for calculating the amount of heat transferred by convection and the amount of heat transferred by radiation, both related to the dissipation of heat from said body surface;
an oxygen amount measurement portion for obtaining information about the blood oxygen amount;
a memory portion for storing relationships between parameters corresponding to said plurality of temperatures and blood oxygen amount and blood sugar levels;
a calculating portion which converts a plurality of measurement values fed from said heat amount measuring portion and said oxygen amount measurement portion into said parameters, and computes a blood sugar level by applying said parameters to said relationships stored in said storage portion; and
a display portion for displaying the result calculated by said calculating portion, wherein;
said oxygen amount measurement portion includes a blood flow volume measurement portion for obtaining information about the blood flow volume, and an optical measurement portion for obtaining the hemoglobin concentration and hemoglobin oxygen saturation in blood, wherein said blood flow volume measurement portion includes;
a body-surface contact portion;
a first temperature detector disposed adjacent to said body-surface contact portion;
a heat-conducting member disposed adjacent to said body-surface contact portion; and
a second temperature detector for detecting the temperature at a position on said heat-conducting member that is spaced apart from said body-contact potion by 3.6 mm or more.
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Abstract
Blood sugar levels are measured non-invasively on the basis of temperature measurement. Measurement data is stabilized by correcting a non-invasive blood sugar level measurement value obtained by a temperature measuring system on the basis of the blood oxygen saturation and the blood flow volume.
23 Citations
16 Claims
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1. A blood sugar level measuring apparatus comprising:
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a heat amount measurement portion for measuring a plurality of temperatures deriving from a body surface and obtaining information used for calculating the amount of heat transferred by convection and the amount of heat transferred by radiation, both related to the dissipation of heat from said body surface;
an oxygen amount measurement portion for obtaining information about the blood oxygen amount;
a memory portion for storing relationships between parameters corresponding to said plurality of temperatures and blood oxygen amount and blood sugar levels;
a calculating portion which converts a plurality of measurement values fed from said heat amount measuring portion and said oxygen amount measurement portion into said parameters, and computes a blood sugar level by applying said parameters to said relationships stored in said storage portion; and
a display portion for displaying the result calculated by said calculating portion, wherein;
said oxygen amount measurement portion includes a blood flow volume measurement portion for obtaining information about the blood flow volume, and an optical measurement portion for obtaining the hemoglobin concentration and hemoglobin oxygen saturation in blood, wherein said blood flow volume measurement portion includes;
a body-surface contact portion;
a first temperature detector disposed adjacent to said body-surface contact portion;
a heat-conducting member disposed adjacent to said body-surface contact portion; and
a second temperature detector for detecting the temperature at a position on said heat-conducting member that is spaced apart from said body-contact potion by 3.6 mm or more. - View Dependent Claims (2, 3, 4)
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5. A blood sugar level measuring apparatus comprising:
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an ambient temperature measuring portion for measuring ambient temperature;
a body-surface contact portion to be brought into contact with a body surface;
an adjacent temperature detector disposed adjacent to said body-surface contact portion;
a radiation heat detector for measuring radiation heat from said body surface;
a heat-conducting member disposed adjacent to said body-surface contact portion;
an indirect temperature detector disposed adjacent to said heat-conducting member at a position spaced apart from said body-surface contact portion by 3.6 mm or more, for detecting the temperature at the position spaced apart from said body-surface contact portion;
a light source for irradiating said body-surface contact portion with light of at least two different wavelengths;
a photodetector for detecting reflected light produced as said light of at least two different wavelengths is reflected on said body surface;
a calculating portion including a conversion portion for converting the outputs of said adjacent temperature detector, said indirect temperature detector, said ambient temperature measuring portion, said radiation heat detector, and said photodetector into parameters, and a processing portion in which relationships between said parameters and blood sugar levels are stored in advance, said processing portion calculating a blood sugar level by applying said parameters to said relationships; and
a display portion for displaying the result outputted from said calculation portion. - View Dependent Claims (6, 7, 8)
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9. A blood sugar level measuring apparatus comprising:
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a plate to be brought into contact with a body surface;
a first temperature sensor for detecting the temperature of said plate;
a member disposed adjacent to said plate;
a second temperature sensor disposed on said member at a position spaced apart from said plate by 3.6 mm or more;
a heat detector for measuring radiation heat from said body surface;
a light source for irradiating said plate with light;
a photodetector for detecting light following the irradiation of said body surface;
a calculation portion for calculating a blood sugar level based on the outputs of said first temperature sensor, said second temperature sensor, said heat detector, and said photodetector. - View Dependent Claims (10, 11, 12)
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13. A blood sugar level measuring apparatus comprising:
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an ambient temperature measuring portion for measuring ambient temperature;
a body-surface contact portion to be brought into contact with a body surface;
an adjacent temperature detector disposed adjacent to said body-surface contact portion;
a radiation heat detector for measuring radiation heat from said body surface;
a heat-conducting member disposed adjacent to said body-surface contact portion;
an indirect temperature detector disposed adjacent to said heat-conducting member at a position spaced apart from said body-surface contact portion by 3.6 mm or more, for detecting the temperature at the position spaced apart from said body-surface contact portion;
a memory portion in which information regarding blood hemoglobin concentration and hemoglobin oxygen saturation is stored;
a calculation portion including a conversion portion for converting the outputs of said adjacent temperature detector, said indirect temperature detector, said ambient temperature measuring portion, and said radiation heat detector, into a plurality of parameters, and a processing portion in which relationships between said parameters and blood sugar levels are stored, said calculation portion calculating a blood sugar level by applying said parameters to said relationships; and
a display portion for displaying the result outputted from said calculation portion. - View Dependent Claims (14, 15, 16)
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Specification
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Current AssigneeHitachi, Ltd.
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Original AssigneeHitachi, Ltd.
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InventorsNagata, Koji, Cho, Ok-Kyung, Mitsumaki, Hiroshi, Kim, Yoon-Ok
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Application NumberUS11/008,360Publication NumberTime in Patent OfficeDaysField of SearchUS Class Current600/365CPC Class CodesA61B 5/01 Measuring temperature of bo...A61B 5/0261 using optical means, e.g. i...A61B 5/14532 for measuring glucose, e.g....A61B 5/1455 using optical sensors, e.g....
