WO2007141859A1 - 精度よく生体成分を非侵襲に計測できる生体成分計測装置 - Google Patents
精度よく生体成分を非侵襲に計測できる生体成分計測装置 Download PDFInfo
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- WO2007141859A1 WO2007141859A1 PCT/JP2006/311530 JP2006311530W WO2007141859A1 WO 2007141859 A1 WO2007141859 A1 WO 2007141859A1 JP 2006311530 W JP2006311530 W JP 2006311530W WO 2007141859 A1 WO2007141859 A1 WO 2007141859A1
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- light
- wavelength
- biological component
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- light emitting
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- 238000005259 measurement Methods 0.000 title claims abstract description 109
- 238000010521 absorption reaction Methods 0.000 claims description 23
- 230000004044 response Effects 0.000 claims description 4
- 230000001678 irradiating effect Effects 0.000 claims description 3
- 230000005457 Black-body radiation Effects 0.000 abstract description 10
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 28
- 239000008103 glucose Substances 0.000 description 28
- 238000010586 diagram Methods 0.000 description 15
- 230000008859 change Effects 0.000 description 14
- 230000007246 mechanism Effects 0.000 description 10
- 230000004048 modification Effects 0.000 description 8
- 238000012986 modification Methods 0.000 description 8
- 210000004369 blood Anatomy 0.000 description 7
- 239000008280 blood Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000005855 radiation Effects 0.000 description 5
- 230000031700 light absorption Effects 0.000 description 4
- 102000009027 Albumins Human genes 0.000 description 3
- 108010088751 Albumins Proteins 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 3
- 238000000691 measurement method Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000036760 body temperature Effects 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- HVYWMOMLDIMFJA-DPAQBDIFSA-N cholesterol Chemical compound C1C=C2C[C@@H](O)CC[C@]2(C)[C@@H]2[C@@H]1[C@@H]1CC[C@H]([C@H](C)CCCC(C)C)[C@@]1(C)CC2 HVYWMOMLDIMFJA-DPAQBDIFSA-N 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical group [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 230000002452 interceptive effect Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- VMPHSYLJUKZBJJ-UHFFFAOYSA-N trilaurin Chemical compound CCCCCCCCCCCC(=O)OCC(OC(=O)CCCCCCCCCCC)COC(=O)CCCCCCCCCCC VMPHSYLJUKZBJJ-UHFFFAOYSA-N 0.000 description 2
- 108010054147 Hemoglobins Proteins 0.000 description 1
- 102000001554 Hemoglobins Human genes 0.000 description 1
- 108010064719 Oxyhemoglobins Proteins 0.000 description 1
- LEHOTFFKMJEONL-UHFFFAOYSA-N Uric Acid Chemical compound N1C(=O)NC(=O)C2=C1NC(=O)N2 LEHOTFFKMJEONL-UHFFFAOYSA-N 0.000 description 1
- TVWHNULVHGKJHS-UHFFFAOYSA-N Uric acid Natural products N1C(=O)NC(=O)C2NC(=O)NC21 TVWHNULVHGKJHS-UHFFFAOYSA-N 0.000 description 1
- 238000000862 absorption spectrum Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 210000001124 body fluid Anatomy 0.000 description 1
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- 238000009529 body temperature measurement Methods 0.000 description 1
- 235000012000 cholesterol Nutrition 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 206010012601 diabetes mellitus Diseases 0.000 description 1
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- 210000000416 exudates and transudate Anatomy 0.000 description 1
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- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
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Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/145—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue
- A61B5/14532—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue for measuring glucose, e.g. by tissue impedance measurement
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/145—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue
- A61B5/14546—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue for measuring analytes not otherwise provided for, e.g. ions, cytochromes
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/145—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue
- A61B5/1455—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue using optical sensors, e.g. spectral photometrical oximeters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N2021/3185—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry typically monochromatic or band-limited
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
- G01N2021/3531—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis without instrumental source, i.e. radiometric
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/314—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry with comparison of measurements at specific and non-specific wavelengths
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
Definitions
- Biological component measuring device that can measure biological components accurately and non-invasively
- the present invention relates to a biological component measuring device and a biological component measuring sensor, and more particularly to a biological component measuring device and a biological component measuring sensor that non-invasively measures a biological component by receiving light from the living body.
- the concentration of a specific component contained in a biological tissue typified by blood or body fluid of a subject has been measured.
- Representative examples of the specific component to be measured include glucose, hemoglobin, oxyhemoglobin, trilaurin, cholesterol, albumin, and uric acid.
- blood glucose measurement is becoming increasingly important as a self-management tool for diabetic patients, and high-frequency measurement leads to improvement of the patient's quality of life (QOL), which in turn prevents heart disease and complications. It is supposed to lead to.
- a biological component measuring device there is a device (semi-invasive type device) that employs an invasive method of collecting biological tissue such as subcutaneous exudate and measuring the concentration of a specific component contained therein.
- this measurement method places a heavy burden on the subject. Therefore, a non-invasive method (non-invasive) is adopted, and the reflected light reflected by the living body or the transmitted light transmitted through the living body is received and its optical characteristic force is also calculated as the concentration of a specific component.
- Invasive devices have been proposed.
- the spectrum of the near-infrared band or the mid-infrared band included in the radiation emitted from the measurement site is analyzed.
- the blood glucose level is measured.
- a temperature measuring element such as a thermocouple is placed in the vicinity of an irradiating unit or in another place to measure the temperature.
- a temperature measuring element such as a thermocouple
- the temperature of the irradiated part should have changed even slightly due to the energy of the irradiated light, but the above temperature measurement method cannot accurately capture the temperature change! was there.
- Patent Document 1 Japanese Patent Application Laid-Open No. 10-258036
- the irradiation unit is irradiated with near-infrared light, and the absorption change power temperature of the light is calculated. The temperature can be measured.
- Patent Document 2 In the apparatus disclosed in JP-T-5-507866 (hereinafter referred to as Patent Document 2), heat at the time of irradiation is used to measure a specific substance in blood. This method is known as photoacoustic spectroscopy, in which the object to be measured undergoes expansion and contraction due to heat when a light pulse is applied, and the sound (pressure change) generated thereby is received by the pressure element. In the apparatus of Patent Document 2 adopting this method, no measurement is performed to correct the error of light absorption caused by the light receiving element using heat as a parameter.
- Patent Document 1 Japanese Patent Laid-Open No. 10-258036
- Patent Document 2 Japanese Patent Publication No. 5-507866
- the apparatus of Patent Document 2 does not employ a measurement method that corrects the light absorption error using heat as a parameter as described above, the measurement result includes the influence of heat, and the measurement result is accurate. If there is a case, there is a problem.
- the present invention has been made in view of such problems, and by accurately measuring changes in the temperature of a measurement object due to irradiation, fluctuations in the amount of irradiation light, and changes in body temperature, the living body can be accurately obtained.
- An object of the present invention is to provide a biological component measuring apparatus and a biological component measuring sensor capable of measuring components.
- a biological component measurement apparatus includes: The wavelength that exhibits specific absorption in the biological component to be measured is defined as the first wavelength, the wavelength that does not exhibit specific absorption in the biological component is defined as the second wavelength, and the light of the first wavelength is transmitted to the measured object.
- a first light emitting unit that irradiates; a light receiving unit that receives light emitted from the first light emitting unit and outputs a signal corresponding to the amount of received light when receiving light of the first wavelength from the first light emitting unit; A concentration calculating unit that calculates the concentration of the biological component based on the first light receiving unit, the first light receiving unit that outputs a first signal according to the amount of received light of the first wavelength, and the second wavelength light. And a second light receiving unit that outputs a second signal corresponding to the received light amount, and the concentration calculating unit calculates the concentration of the biological component based on the first signal and the second signal.
- the light of the first wavelength and the second wavelength is preferably mid-infrared light.
- the concentration calculation unit calculates the concentration of the biological component based on the first signal and the second signal before and after the irradiation with the light of the first wavelength.
- the second light receiving unit includes a filter that transmits the second wavelength, and receives light of the second wavelength that has passed through the filter out of light emitted from the measurement target.
- the biological component measuring apparatus includes a second light emitting unit that irradiates the measurement object with light of the second wavelength, and a switching unit that switches between irradiation in the first light emitting unit and irradiation in the second light emitting unit.
- the light receiving unit outputs a third signal corresponding to the amount of received light of the first wavelength emitted from the measurement target when light of the second wavelength is irradiated from the second light emitting unit.
- a third light receiving unit and a fourth light receiving unit that outputs a fourth signal corresponding to the amount of light received at the second wavelength emitted from the measurement object. It is preferable to calculate the concentration of the biological component based on the four signals.
- the biological component does not exhibit specific absorption! /
- the biological component measuring device receives light of the third wavelength by setting a wavelength different from the second wavelength as the third wavelength.
- a third light-emitting unit that irradiates the measurement object; and a switching unit that switches between irradiation at the first light-emitting unit and irradiation at the third light-emitting unit, and the light-receiving unit receives a third wavelength from the third light-emitting unit.
- the 5th light receiving part that outputs the 5th signal according to the received light quantity of the 2nd wavelength light radiated, and the 3rd wavelength light emitted by the measured body strength
- a sixth light receiving unit that outputs a sixth signal corresponding to the amount of received light, and the concentration calculating unit includes the first signal, the second signal, the fifth signal, and the sixth signal. It is preferable to calculate the concentration of the biological component based on the number.
- the biological component measuring apparatus measures the second light emitting unit that irradiates the measurement object with light of the second wavelength, the irradiation in the first light emitting unit, and the irradiation in the second light emitting unit.
- Switching means for switching at a time interval shorter than the thermal response of the body, and the light receiving unit emits the second wavelength light emitted by the measured physical strength when the second light emitting unit emits the second wavelength light.
- a fourth light receiving unit that outputs a fourth signal corresponding to the amount of received light, and the calculation unit calculates a difference between the first signal and the fourth signal and a difference between the fourth signal and the second signal. It is preferable to calculate the concentration of the biological component based on the above.
- the biological component measurement sensor uses a wavelength that exhibits specific absorption in the biological component to be measured as the first wavelength, and does not exhibit specific absorption in the biological component.
- a light receiving unit that receives the light and outputs a signal corresponding to the amount of received light.
- the light receiving unit includes a first light receiving unit that outputs a first signal corresponding to the amount of received light of the first wavelength, and light of the second wavelength. And a second light receiving unit that outputs a second signal corresponding to the amount of received light.
- the biological component measurement sensor includes a second light emitting unit that irradiates the measurement object with light of the second wavelength, and a switching unit that switches between irradiation in the first light emitting unit and irradiation in the second light emitting unit.
- the light receiving unit outputs a third signal corresponding to the amount of received light of the first wavelength emitted from the measurement target when light of the second wavelength is irradiated from the second light emitting unit.
- it further includes a third light receiving portion and a fourth light receiving portion that outputs a fourth signal corresponding to the amount of light of the second wavelength emitted from the measurement object.
- the biological component does not exhibit specific absorption! /
- the biological component measurement sensor receives the light of the third wavelength with a wavelength different from the second wavelength as the third wavelength.
- a third light-emitting unit that irradiates the measurement object; and a switching unit that switches between irradiation at the first light-emitting unit and irradiation at the third light-emitting unit.
- the 5th light receiving part that outputs the 5th signal according to the received light quantity of the 2nd wavelength light radiated, and the 3rd wavelength light emitted by the measured body strength
- a sixth light receiving section for outputting a sixth signal corresponding to the amount of received light.
- the biological component measuring device and the biological component measuring sensor that are useful in the present invention detect transmission or reflected light from a light source having an absorption wavelength of a target component in transmission and scattering / reflection measurement, and at the same time, When natural radiation is emitted from the measured physical strength, the temperature change of the irradiated part is captured and corrected at the time of irradiation.
- Biological radiation light has a peak in the mid-infrared, and the relationship between the amount of light and temperature is so accurate that it has been commercialized as an infrared thermometer for ears and foreheads.
- the biological component measurement device and the biological component measurement sensor according to the present invention measure the natural radiation during irradiation, thereby changing the temperature of the measurement target due to irradiation, the fluctuation of the irradiation light amount, and Changes in body temperature can be accurately measured, and highly accurate correction is possible.
- the biological component measuring device and the biological component measuring sensor according to the present invention are provided with two light sources, so that they are not reflected in natural radiated light. Changes in the measurement target itself such as scattering coefficient, moisture, and interfering substances Can also be corrected.
- FIG. 1 is a diagram showing a specific example of a configuration of a biological component measuring apparatus according to an embodiment.
- FIG. 2 is a diagram showing an absorption spectrum of glucose as a specific example of a biological component.
- FIG. 3 is a diagram showing the output at the light receiving unit when 9.6 um wavelength light is irradiated to the glucose scattering aqueous solution and the light emitted from the liquid is detected through the 9.6 um filter and 8.5 um filter, respectively. .
- FIG. 4 is a diagram showing the relationship between the glucose concentration and the output from the light receiving unit 17.
- FIG. 5 is a diagram for explaining the configuration of a biological component measurement sensor 10 in the biological component measurement device that is useful in the first embodiment.
- FIG. 6 is a diagram illustrating a configuration of a biological component measurement sensor 10 in a biological component measurement apparatus according to a modification of the first embodiment.
- FIG. 7A is a diagram for explaining the configuration of a biological component measurement sensor 10 in a biological component measurement device that is useful in the second embodiment.
- FIG. 7B is a diagram for explaining a modified example of the biological component measurement sensor 10 in the biological component measurement device that is relevant to the second embodiment.
- FIG. 7C is a diagram for explaining a modified example of the biological component measurement sensor 10 in the biological component measurement device that is relevant to the second embodiment.
- FIG. 8A is a diagram for explaining a configuration of a biological component measurement sensor 10 in a biological component measurement device according to a modification of the second embodiment.
- FIG. 8B is a diagram for explaining a modified example of the biological component measurement sensor 10 in the biological component measuring apparatus according to the modified example of the second embodiment.
- FIG. 8C is a diagram for explaining a modified example of the biological component measuring sensor 10 in the biological component measuring apparatus according to the modified example of the second embodiment.
- FIG. 9 is a first diagram showing an outline of a change in output V from the light receiving unit 17.
- FIG. 10 is a second diagram showing an outline of changes in the output V from the light receiving unit 17.
- the biological component measurement apparatus includes a biological component measurement sensor 10 that receives reflected light from the measurement target 30, and a sensing from the biological component measurement sensor 10. It is configured to include a control unit 23 that receives a signal via the light receiving circuit 21 and calculates the concentration of the predetermined biological component, and a concentration output unit 25 that outputs the calculated concentration of the predetermined biological component. .
- the biological component measurement sensor 10 includes a light emitting unit 11 that emits light to the measurement target 30, and a light guide unit 13 that guides light emitted from the measurement target 30 in a target direction. And a light receiving unit 17 including a light receiving element that receives the light guided by the light guide unit 13 through the filter 15.
- the light receiving mechanism including the filter 15 and the light receiving unit 17 may be referred to as a “light receiving unit”.
- the light emitting unit 11 irradiates the measurement object 30 with mid-infrared light, and more preferably with light having a wavelength of 3 um to: Lim.
- Examples of light sources include heating element light sources (IR (Infrared) light sources using ceramics, alumina, etc.) with a wide wavelength range, and various lasers of monochromatic light sources (C02 lasers, YAG lasers, quantum cascade semiconductors, etc.). .
- IR Infrared
- C02 lasers, YAG lasers, quantum cascade semiconductors, etc. various lasers of monochromatic light sources.
- the light guide unit 13 is preferably a pipe or fiber whose inner surface 13A forming the light guide path is mirror-finished by vapor deposition of gold plating, gold, aluminum, or the like.
- Examples of the light receiving element included in the light receiving unit 17 include MCT (Metal Oxide Semiconductor) Controlled Thyristor, thermopile, pyroelectric sensor, and bolometer.
- MCT Metal Oxide Semiconductor
- the biological component specifically absorbs light of a specific wavelength regardless of the concentration.
- the specific absorption wavelength is known to be around 9.6um. Since the amount of absorption varies depending on the concentration, the concentration of the component can be determined by measuring the amount of light absorption.
- the biological component measurement sensor 10 irradiates the measurement object 30 with light having an absorption wavelength specific to the biological component to be measured.
- the biological component to be measured is glucose
- irradiation with 9.6 um wavelength light is preferable.
- the irradiated light is scattered and absorbed inside the measurement object, and part of it is emitted from the surface on the same side as the incident light as scattered reflected light.
- an object having a temperature emits light having a wavelength specific to the temperature and the substance. This emission of light is called blackbody radiation.
- blackbody radiation In the case of a living body at 37 ° C, it has a peak at about 9 um and emits light with a wavelength in the range of 3 um to 5 Oum.
- the light receiving unit 17 receives the light.
- the light having the same wavelength as the irradiated light includes scattered reflected light that has been absorbed by biological components and black body radiation corresponding to the temperature of the measurement target 30.
- the absorption wavelength specific to the biological component to be measured is the first wavelength
- the wavelength of light that is not absorbed by the biological component is the second wavelength.
- the light of the first wavelength is irradiated from the light emitting unit 11 of the biological component measurement sensor 10 to the measurement target 30.
- the light receiving unit 17 from the measurement object 30 before and after the irradiation, The emitted light of the first wavelength and the light of the second wavelength are received, and the control unit 23 calculates the concentration of the biological component using the change in the light amount.
- the biological component to be measured is glucose
- the first wavelength is 9.6 um
- the second wavelength is 8.5 um or 10.5 um.
- Fig. 3 shows a ceramic IR light source with a 9.6um bandpass filter as the light emitting unit 11, a glucose scattering aqueous solution as the measurement target 30, and a glucose scattering aqueous solution as the measurement target 30.
- the light receiving unit 17 detects light emitted from the liquid through the 9.6um filter and 8.5um filter 15 respectively.
- the output changes during. 9. Since the light of 6um wavelength is cut by the 8.5um filter, the output V includes the irradiation light signal, and only the thermal change of the measurement object 30 is reflected.
- the output difference V between the two shows a substantially constant value during irradiation. This is because the change in output due to the heat contained in output V changes the output V.
- the output difference V ( V -V), which is a value representing the relative relationship with 8.5 (9.6), is the thermal effect obtained from output V to output s 9.6 8.5 (9.6) 9.6 8.5 (9.6 )
- Figure 4 shows the output V from the light receiving unit 17 at a wavelength of 9.6 um, and the outputs V and 8 at a wavelength of 9.6 um when the glucose concentration is around OgZdl, 0.5 g / dl, and lgZdl. At 5um wavelength
- the output V) is reflected by the control unit 23 where the value variation is small.
- correction formula is not limited to this.
- output ratio V v / s 9.6
- V is also valid.
- Another correction value when the irradiation light is strong or 9.6um fill
- the biological component measurement sensor irradiates light from the measured object 30 by irradiating light of a first wavelength specific to the biological component to be measured. Depending on the thickness of the object to be measured 30, the transmitted light is received in the same way and used for correction.
- biological component measurement sensor 10 that is useful in the first embodiment includes first filter 15A and second filter 15B as filter 15.
- the first filter 15A is a filter that transmits light having an absorption wavelength specific to the biological component to be measured (the first wavelength), and the second filter 15B is close to the biological component to be measured. This is a filter that transmits light that has not been absorbed and has a wavelength of the fluorescent light (the second wavelength).
- the biological component to be measured is glucose
- the 9.6um filter corresponds to the first filter 15A
- the 8.5um filter corresponds to the second filter 15B.
- One of the first filter 15A and the second filter 15B is arranged at a position where the light guided by the light guide unit 13 from the measured object 30 to the light receiving unit 17 is blocked (see Fig. 5), and is extremely short. The position is switched so that the other filter is placed in that position after time. Since it is preferable that light reception through both filters is performed a plurality of times for one irradiation, this switching is preferably performed a plurality of times.
- the mechanism for switching the positions of the first filter 15A and the second filter 15B is not limited to a specific mechanism in the present invention, but as a specific example, the first filter 15A and the second filter 15B are provided in a disk.
- the first filter 15A and the second filter 15B are alternately arranged at the above position by rotating the disk.
- Another specific example is the plate The first filter 15A and the second filter 15B are provided, and the first filter 15A and the second filter 15B are moved to the above positions by moving the plates at right angles to the guide direction of the light from the measurement target 30 (up and down in FIG. 5).
- An example is a mechanism in which the two filters 15B are alternately arranged.
- the control unit 23 outputs a control signal to the drive unit for switching the arrangement of the first filter 15A and the second filter 15B, and controls the switching.
- the light emitting unit 11 irradiates the light to be measured 30 with the light having the first wavelength, and the light receiving unit 17 receives the light from the material to be measured 30 having the first wavelength via the first filter 15A. Then, light from the measurement object 30 having the second wavelength is received through the second filter 15B. In this case, the light received by the light receiving unit 17 via the first filter 15A is scattered reflected light that has been absorbed by the biological component to be measured, and the light received via the second filter 15B is not received. This is black body radiation due to the heat of the measuring body 30.
- the control unit 23 receives the light from the light emitting unit 11 through the 9.6um filter when the light having the wavelength of 9.6um is irradiated.
- the output V from the light receiving unit 17 according to the amount of scattered reflected light and the wave from the light emitting unit 11 to 9.6um
- the output V from the light receiving unit 17 is obtained according to the amount of the 8.5 um wavelength black body radiation received through the 8.5 um filter.
- Glucose concentration can be obtained.
- the configuration of the biological component measurement sensor 10 may be the configuration shown in FIG. That is, referring to FIG. 6, as a modification, the biological component measurement sensor 10 includes a first light receiving unit 17A corresponding to the first filter 15A and a second light receiving unit 17B corresponding to the second filter 15B. May be.
- the control unit 23 obtains the output V and the output V by simultaneously receiving light in each of the light receiving units 17A and 17B, performs the above correction, and performs the correction.
- Lucose concentration can be obtained.
- the wavelength of the scattered reflected light is the same as the wavelength of the light emitted from the light emitting unit 11, the first light for receiving the scattered reflected light of the light emitted from the light emitting unit 11 in the light receiving unit 17 is used.
- the filter 15A may be an opening instead of the filter. The same applies to the following embodiments. [0049] [Second Embodiment]
- the biological component measurement sensor 10 includes a first light emitting unit 11A as a light emitting unit 11, a second light emitting unit 11B, and a first filter 15A as a filter 15.
- a second filter 15B is included.
- the first light emitting unit 11A emits light having an absorption wavelength specific to the biological component to be measured (the first wavelength), and the second light emitting unit 11B absorbs the biological component to be measured. Do not! Irradiate light of the wavelength of light (second wavelength above).
- the first filter 15A is a filter that transmits light having an absorption wavelength specific to the biological component to be measured (the first wavelength), and the second filter 15B is close to the biological component to be measured. This is a filter that transmits light of the wavelength of the unabsorbed fluorescent light (the second wavelength).
- the biological component to be measured is glucose
- the first wavelength corresponds to 9.6 um
- the second wavelength corresponds to 8.5 um
- the first filter 15A has a 9.6 um filter
- the second wavelength Filter 15B is an 8.5um filter.
- the irradiation of the first wavelength light from the first light emitting unit 11A and the irradiation of the second wavelength light from the second light emitting unit 11B are switched by the mirror 12, and one of them is applied to the measurement object 30. It is done.
- the drive of the mirror 12 is controlled by the control unit 23.
- one of the first filter 15A and the second filter 15B is light guided by the light guide unit 13 from the measurement target 30 to the light receiving unit 17. The position is switched so that the other filter is placed in that position after a very short time (see Figure 7A).
- the specific mechanism can be the same as the mechanism according to the first embodiment.
- the control unit 23 receives light through the 9.6um filter when irradiated with light having a wavelength of 9.6um from the first light emitting unit 11A. Output V from light receiving unit 17 according to the amount of scattered reflected light of 6um wavelength, and 8.5um filter
- the output V from the light receiving unit 17 corresponding to the amount of light is obtained.
- the control unit 23 outputs these
- a glucose concentration that eliminates the change in state can be obtained.
- the configuration for switching the wavelength of the light emitted from the light emitting unit 11 to the measurement target 30 is not limited to the above configuration as shown in FIG. 7A, and any other configuration may be used. Good.
- the light emitting unit 11 switches the filters 14A and 14B as a configuration in which light is irradiated through the filter 14A that transmits the first wavelength or the filter 14B that transmits the second wavelength.
- the wavelength of the light emitted from the light emitting unit 11 may be switched between the first wavelength and the second wavelength, and the first light emitting unit 11A and the second light emitting unit 11B are both connected as shown in FIG. 7C.
- the wavelength of the emitted light can be switched by electrically switching the irradiation of the first light-emitting part 11A and the irradiation from the second light-emitting part 11B, it is arranged at the position where the measurement object 30 is irradiated with light. Good.
- biological component measurement sensor 10 that is useful in the modification further includes first filter 15 A, second filter 15 B, and third filter 15 C as filter 15.
- the first filter 15A is a filter that transmits light having an absorption wavelength specific to the biological component to be measured (the first wavelength)
- the second filter 15B is a wavelength of light that is not absorbed by the biological component to be measured.
- the third filter 15 C absorbs light that is not absorbed by the biological component to be measured but is specially absorbed by other components (interfering components). It is a filter that transmits light of the wavelength (third wavelength).
- the biological component to be measured is glucose, 9.6 um for the first wavelength, 8.5 um for the second wavelength, and albumin as the disturbing component for the third wavelength 7.
- the first filter 15A is a 9.6um filter
- the second filter 15B is an 8.5um filter
- the third filter 15C is a 7.lum filter.
- one of the first filter 15A and the second filter 15B, or the second filter 15B and the third filter 15C is received from the measured object 30 and the light receiving unit.
- the position is switched so that the light guided to the light guide 13 to 17 is blocked (see FIG. 8A), and the other filter is positioned at that position after a very short time.
- the specific mechanism can be the same as the mechanism according to the first embodiment.
- the control unit 23 receives light through the 9.6um filter when irradiated with light having a wavelength of 9.6um from the first light emitting unit 11A. Output V from light receiving unit 17 according to the amount of scattered reflected light of 6um wavelength, and 8.5um filter
- the output V from the light receiving unit 17 according to the amount of scattered and reflected light of lum wavelength received by the filter, and the black body radiation of 8.5 um wavelength received by the 8.5 um filter.
- the output V from the light receiving unit 17 corresponding to the amount of light is obtained.
- the control unit 23 outputs these
- the configuration for switching the wavelength of the light emitted from the light emitting unit 11 to the measurement object 30 can be configured as shown in Figs. 8B and 8C.
- the configuration of the biological component measuring sensor 10 of the biological component measuring device that is useful in the third embodiment is as follows. This is the same as the configuration of the biological component measurement sensor 10 that works on the second embodiment shown in FIG. 7A.
- the control unit 23 performs irradiation of the first wavelength light of the first light emitting unit 11A force and irradiation of the second wavelength light from the second light emitting unit 11B. Control to switch to high speed.
- the timing for switching between the first wavelength and the second wavelength is preferably shorter than the thermal response of the living body, which is the measurement object 30, and the timing.
- the light emitting unit 11 switches the light of the wavelength of 9.6 um and the light of the wavelength of 8.5 um at high speed and alternately irradiates the measurement object 30 .
- the control unit 23 scatters and reflects the 9.6 um wavelength received when the 9.6 um wavelength light is emitted from the first light emitting unit 11A through the first filter 15A, which is a 9.6 um filter.
- the output V from the light receiving unit 17 according to the amount of light and the light of the wavelength of 8.5um from the second light emitting unit 11B are irradiated.
- the output V from the light receiving unit 17 is obtained according to the amount of scattered reflected light having a wavelength of 8.5 ⁇ m.
- the light was received when light having a wavelength of 8.5 um was irradiated from the second light emitting unit 11B through the second filter 15B, which was a filter that passed 8.5 um but did not pass 9.6 um.
- the output V from the light receiving unit 17 is obtained according to the amount of the 8.5 um wavelength black body radiation received when the um wavelength light is irradiated.
- output 1 represents output V 1 and output V at a certain glucose concentration.
- Output 2 represents output V and output V when the glucose concentration is different.
- the horizontal axis in Fig. 9 is the hour
- the change in glucose concentration appears as a change in the amplitude of the AC component.
- the change in amplitude of the AC component is detected with high accuracy by using well-known minute signal detection techniques such as using a lock-in amplifier.
- FIG. 10 shows the output V when the light of 9.6 um is irradiated from the first light emitting unit 11A to the measured object 30, and the second light emitting unit 11B force to the measured object 30. . 5um wavelength light It represents the output V when irradiated. As shown in Figure 10, the output V is 8.5um
- this output V and output V are equal to the difference between output V and output V.
- Vs f (V ⁇ V, V, V).
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Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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CN2006800519375A CN101336371B (zh) | 2006-06-08 | 2006-06-08 | 可高精度非侵入地计测生物体成分的生物体成分计测装置 |
US12/158,893 US20090105564A1 (en) | 2006-06-08 | 2006-06-08 | Living body component measuring apparatus capable of precisely and non-invasively measuring living body component |
JP2008520095A JPWO2007141859A1 (ja) | 2006-06-08 | 2006-06-08 | 精度よく生体成分を非侵襲に計測できる生体成分計測装置 |
PCT/JP2006/311530 WO2007141859A1 (ja) | 2006-06-08 | 2006-06-08 | 精度よく生体成分を非侵襲に計測できる生体成分計測装置 |
EP06757177A EP2026058A4 (en) | 2006-06-08 | 2006-06-08 | DEVICE FOR MEASURING A BIOLOGICAL COMPONENT CAPABLE OF MEASURING NON-INVASIVE PRECISION ACCURATELY A BIOLOGICAL CONSTITUENT |
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PCT/JP2006/311530 WO2007141859A1 (ja) | 2006-06-08 | 2006-06-08 | 精度よく生体成分を非侵襲に計測できる生体成分計測装置 |
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US (1) | US20090105564A1 (ja) |
EP (1) | EP2026058A4 (ja) |
JP (1) | JPWO2007141859A1 (ja) |
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JP2011511694A (ja) * | 2008-02-11 | 2011-04-14 | グルコビスタ・エルエルシー | 網膜から逆反射された光を使用して、血液中の物質濃度を非侵襲的に測定する装置および方法 |
WO2011074217A1 (ja) * | 2009-12-18 | 2011-06-23 | パナソニック株式会社 | 成分濃度計、成分濃度測定方法、出荷検査システム、及び健康管理システム |
CN103260515A (zh) * | 2010-10-14 | 2013-08-21 | 株式会社日立制作所 | 生物体信息获取解析装置 |
WO2016117520A1 (ja) * | 2015-01-21 | 2016-07-28 | 国立研究開発法人日本原子力研究開発機構 | 血中物質濃度測定装置及び血中物質濃度測定方法 |
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WO2011074217A1 (ja) * | 2009-12-18 | 2011-06-23 | パナソニック株式会社 | 成分濃度計、成分濃度測定方法、出荷検査システム、及び健康管理システム |
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JPWO2016117520A1 (ja) * | 2015-01-21 | 2017-10-26 | 国立研究開発法人量子科学技術研究開発機構 | 血中物質濃度測定装置及び血中物質濃度測定方法 |
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Also Published As
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EP2026058A1 (en) | 2009-02-18 |
JPWO2007141859A1 (ja) | 2009-10-15 |
CN101336371A (zh) | 2008-12-31 |
US20090105564A1 (en) | 2009-04-23 |
EP2026058A4 (en) | 2009-12-30 |
CN101336371B (zh) | 2012-02-01 |
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