Blood sugar level measuring apparatus

• US 7,251,515 B2
• Filed: 03/31/2004
• Issued: 07/31/2007
• Est. Priority Date: 02/17/2004
• Status: Expired due to Fees

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Nagata, Koji, Cho, Ok-Kyung, Mitsumaki, Hiroshi, Kim, Yoon-Ok
• Primary Examiner(s): WINAKUR, ERIC FRANK
• Application Number:
  US10/813,241
• Publication Number:
  US 20050182310A1
• Time in Patent Office: 1,217 Days
• Field of Search: 600/310, 600/316, 600/322, 600/323, 600/326, 600/365, 600/549
• US Class Current: 600/316
• CPC Class Codes: A61B 5/01 Measuring temperature of body parts ; Diagnostic temperature sensing, e.g. for malignant or inflamed tissue clinical contact thermometers G01K13/20
• 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
• CPC Class Codes: A61B 5/7475 User input or interface means, e.g. keyboard, pointing device, joystick

Abstract

Blood sugar levels are measured non-invasively based on temperature measurement. Non-invasively measured blood sugar level values obtained by a temperature measurement scheme are corrected by blood oxygen saturation and blood flow volume, thereby stabilizing the measurement data. The shape or color of control buttons for controlling measurement are associated with the function of each button such that the buttons can be identified either visually or by touch.

Claims

1. A blood sugar level measuring apparatus comprising:

a heat amount measurement portion for measuring a plurality of temperatures derived 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 measuring portion for obtaining information about blood oxygen amount;

a storage portion for storing a relationship 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 relationship stored in said storage portion;

a display portion for displaying the blood sugar level calculated by said calculating portion; and

a plurality of operation buttons including a measurement start button for instructing the start of a measurement, and a plurality of control buttons for performing controls other than the instruction for the start of measurement, wherein said oxygen amount measuring portion comprises a blood flow volume measurement portion for measuring information about the volume of blood flow, and an optical measurement portion for obtaining blood hemoglobin concentration and hemoglobin oxygen saturation, and wherein said blood flow volume measurement portion includes;

a body-surface contact portion;

an adjacent temperature detector disposed adjacent to said body-surface contact portion;

an indirect temperature detector for detecting the temperature at a position spaced apart from said body-surface contact portion; and

a heat conducting member connecting said body-surface contact portion and said indirect temperature detector.

2. The blood sugar level measuring apparatus according to claim 1, wherein said measurement start button has a different shape from that of the other operation buttons.

3. The blood sugar level measuring apparatus according to claim 1, wherein said measurement start button has a different color from that of the other operation buttons.

4. The blood sugar level measuring apparatus according to claim 1, wherein said measurement start button is larger than the other operation buttons.

5. The blood sugar level measuring apparatus according to claim 1, further comprising an openable and closable cover for covering the operation buttons other than said measurement start button.

6. A blood sugar level measuring apparatus comprising:

an ambient temperature measuring device for measuring ambient temperature;

a body-surface contact portion to which a body surface is brought into contact;

an adjacent temperature detector disposed adjacent to said body-surface contact portion;

a radiant heat detector for measuring radiant heat from said body surface;

a heat conducting member disposed in contact with said body-surface contact portion;

an indirect temperature detector disposed at a position that is adjacent to said heat conducting member and that is spaced apart from said body-surface contact portion, said indirect temperature detector measuring 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 light detector for detecting reflected light produced as said light is reflected by said body surface;

a converter for converting outputs from said adjacent temperature detector, said indirect temperature detector, said ambient temperature detector, said radiant temperature detector and said light detector, into parameters;

a calculating portion in which a relationship between said parameters and blood sugar levels is stored in advance, and which calculates a blood sugar level by applying said parameters to said relationship;

a display for displaying the blood sugar level outputted from said calculating portion; and

a plurality of operation buttons including a measurement start button for instructing the start of a measurement, and a plurality of control buttons for performing controls other than the instruction for the start of measurement.

7. The blood sugar level measuring apparatus according to claim 6, wherein said measurement start button has a different shape from that of the other operation buttons.

8. The blood sugar level measuring apparatus according to claim 6, wherein said measurement start button has a different color from that of the other operation buttons.

9. The blood sugar level measuring apparatus according to claim 6, wherein said measurement start button larger than the other operation buttons.

10. The blood sugar level measuring apparatus according to claim 6, further comprising an openable and closable cover for covering the operation buttons other than said measurement start button.

11. A blood sugar level measuring apparatus comprising:

an ambient temperature measuring device for measuring ambient temperature;

a body-surface contact portion to which a body surface is brought into contact;

an adjacent temperature detector disposed adjacent to said body-surface contact portion;

a radiant heat detector for measuring radiant heat from said body surface;

a heat conducting member disposed in contact with said body-surface contact portion;

an indirect temperature detector disposed at a position that is adjacent to said heat conducting member and that is spaced apart from said body-surface contact portion, said indirect temperature detector measuring temperature at the position spaced apart from said body-surface contact portion;

a storage portion where information about blood hemoglobin concentration and blood hemoglobin oxygen saturation is stored;

a converter for converting outputs from said adjacent temperature detector, said indirect temperature detector, said ambient temperature measuring device and said radiant heat detector, into a plurality of parameters;

a calculating portion in which relationships among said parameters, said information about blood hemoglobin concentration and blood hemoglobin oxygen saturation, and blood sugar levels are stored in advance, said calculating portion including a processing portion for calculating a blood sugar level by applying at least said parameters to said relationships;

a display for displaying the blood sugar level outputted from said calculating portion; and

a plurality of operation buttons including a measurement start button for instructing the start of a measurement, and a plurality of control buttons for performing controls other than the instruction for the start of measurement.

12. The blood sugar level measuring apparatus according to claim 11, wherein said measurement start button has a different shape from that of the other operation buttons.

13. The blood sugar level measuring apparatus according to claim 11, wherein said measurement start button has a different color from that of the other operation buttons.

14. The blood sugar level measuring apparatus according to claim 11, wherein said measurement start button larger than the other operation buttons.

15. The blood sugar level measuring apparatus according to claim 11, further comprising an openable and closable cover for covering the operation buttons other than said measurement start button.

16. The blood sugar level measuring apparatus according to claim 11, wherein said processing portion calculates said blood sugar level by applying said parameters and optimum constants for blood hemoglobin concentration and blood hemoglobin oxygen saturation from said storage portion to said relationships.