WO2015146238A1 - 成分測定装置 - Google Patents
成分測定装置 Download PDFInfo
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- WO2015146238A1 WO2015146238A1 PCT/JP2015/051326 JP2015051326W WO2015146238A1 WO 2015146238 A1 WO2015146238 A1 WO 2015146238A1 JP 2015051326 W JP2015051326 W JP 2015051326W WO 2015146238 A1 WO2015146238 A1 WO 2015146238A1
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- light
- insertion hole
- calibration
- chip
- component measuring
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/66—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving blood sugars, e.g. galactose
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- 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 or pH-value ; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid or cerebral tissue
- A61B5/14532—Measuring characteristics of blood in vivo, e.g. gas concentration or pH-value ; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid or cerebral tissue for measuring glucose, e.g. by tissue impedance measurement
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- 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 or pH-value ; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid or cerebral tissue
- A61B5/1455—Measuring characteristics of blood in vivo, e.g. gas concentration or pH-value ; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid or cerebral tissue using optical sensors, e.g. spectral photometrical oximeters
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/15—Devices for taking samples of blood
- A61B5/150007—Details
- A61B5/150015—Source of blood
- A61B5/150022—Source of blood for capillary blood or interstitial fluid
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/15—Devices for taking samples of blood
- A61B5/150007—Details
- A61B5/150343—Collection vessels for collecting blood samples from the skin surface, e.g. test tubes, cuvettes
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/15—Devices for taking samples of blood
- A61B5/150007—Details
- A61B5/150358—Strips for collecting blood, e.g. absorbent
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/15—Devices for taking samples of blood
- A61B5/157—Devices characterised by integrated means for measuring characteristics of blood
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- 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
- G01N21/251—Colorimeters; Construction thereof
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- 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
- G01N21/27—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using photo-electric detection ; circuits for computing concentration
- G01N21/274—Calibration, base line adjustment, drift correction
-
- 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
- G01N21/27—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using photo-electric detection ; circuits for computing concentration
- G01N21/274—Calibration, base line adjustment, drift correction
- G01N21/276—Calibration, base line adjustment, drift correction with alternation of sample and standard in optical path
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- 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
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
- G01N21/78—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator producing a change of colour
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/483—Physical analysis of biological material
- G01N33/487—Physical analysis of biological material of liquid biological material
- G01N33/49—Blood
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/483—Physical analysis of biological material
- G01N33/487—Physical analysis of biological material of liquid biological material
- G01N33/493—Physical analysis of biological material of liquid biological material urine
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/80—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving blood groups or blood types or red blood cells
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- 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
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
- G01N2021/7756—Sensor type
- G01N2021/7759—Dipstick; Test strip
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/06—Illumination; Optics
- G01N2201/062—LED's
Definitions
- the present invention relates to a component measuring apparatus for measuring a predetermined component of a body fluid collected on a measuring chip.
- a component measuring apparatus for measuring a predetermined component in a body fluid such as blood or urine has been widely used.
- a component measuring device of this type a sample such as blood is attached to a test pad provided on a strip, and the coloration degree is measured optically when the reagent impregnated in the test pad is reacted with the sample.
- a colorimetric component measuring apparatus is known (see, for example, Japanese Patent Publication No. 10-505676).
- This colorimetric component measuring device provides light to the test pad through a strip holding portion in which a strip passage (insertion hole) into which the strip is inserted is formed and a hole opening in the wall surface of the strip passage. And a light receiving unit that receives reflected light from the test pad.
- bias means for urging the strip toward the hole is disposed at a position facing the hole, and a gray target (calibration member) is provided in the bias means.
- the light reflectance of the gray target of the biasing unit is measured before the strip is inserted into the strip passage, and the light emitting unit is measured based on the measurement result.
- the amount of light energy can be adjusted (calibrated). This makes it possible to suppress measurement variations due to changes in the optical system over time.
- the present invention has been made in consideration of such problems, and can improve work efficiency and suppress contamination of the light emitting unit and the light receiving unit, and can accurately determine predetermined components in body fluids. It aims at providing the component measuring apparatus which can be measured.
- a component measuring apparatus is a component measuring apparatus that measures a predetermined component in a body fluid collected by a measuring chip, and a chip mounting portion in which an insertion hole into which the measuring chip can be inserted is formed; Light from the light emitting part that irradiates light to the measurement chip through the introduction port that opens to the wall surface that constitutes the insertion hole, and light from the measurement chip that is guided through the lead-out port that opens to the wall surface that constitutes the insertion hole A light receiving portion that receives light, a calibration member disposed in the insertion hole so as to be slidable along the insertion direction of the measurement chip, and a biasing member that biases the calibration member toward the insertion port side of the insertion hole.
- the calibration member closes the inlet and the outlet while the measurement chip is not inserted into the insertion hole and is irradiated with light from the light emitting unit.
- Maintained by the biasing means. Is, the slide on the opposite side of the measurement chip the insertion hole said insertion opening so that light is emitted from the light emitting unit to the measurement chip with the insertion into the, characterized in that.
- the component measuring apparatus since the introduction port and the discharge port are closed with the calibration member in a state where the measurement chip is not inserted into the insertion hole, it is possible to suppress mixing of foreign matter into the insertion hole. Even without providing a cover member, entry of foreign matter from the outside into the inlet and outlet is suppressed. Therefore, the work efficiency can be improved (the cover member is not required to be attached / detached), and contamination of the light emitting unit and the light receiving unit can be suppressed.
- the calibration member is held by the urging means at the position where the light from the light emitting unit is irradiated, so the component measuring device is calibrated based on the light reception signal of the light receiving unit that receives the light from the calibration member.
- the calibration member slides and the measurement chip is irradiated with light from the light emitting unit, so that a predetermined component in the body fluid collected by the measurement chip is accurately measured. be able to.
- a calibration control unit for calibrating the component measuring apparatus may be further provided.
- the component measuring apparatus can be appropriately calibrated.
- the component measurement apparatus may further include an ejecting unit that slides the calibration member toward the insertion port and removes the measurement chip from the insertion hole.
- the measuring chip can be easily and reliably removed from the insertion hole. Moreover, when removing the measuring chip, it is possible to suitably suppress foreign matters from entering the inlet and outlet through the insertion hole from the outside.
- the urging unit may have an insertion passage that is provided on the opposite side of the insertion hole with respect to the calibration member from the insertion port and through which the ejection portion is inserted.
- the component measuring device can be downsized.
- the urging means may be a compression coil spring having the insertion passage in the center.
- the biasing means is a compression coil spring, the configuration of the biasing member can be simplified.
- the introduction port and the outlet port may be formed to face each other, and the light receiving unit may receive transmitted light from the calibration member or the measurement chip.
- the predetermined component in the body fluid can be accurately measured by light transmission measurement.
- one opening may be formed by the introduction port and the outlet port, and the light receiving unit may receive reflected light from the calibration member or the measurement chip.
- a predetermined component in the body fluid can be accurately measured by light reflection measurement.
- the calibration member can be held by the biasing means at a position where the introduction port and the discharge port are closed while the measurement chip is not inserted into the insertion hole and the light from the light emitting unit is irradiated. Therefore, the working efficiency can be improved, the contamination of the light emitting part and the light receiving part can be suppressed, and the predetermined component in the body fluid can be measured with high accuracy.
- FIG. 5A is a partially omitted cross-sectional view showing a state in which the measurement chip of FIG. 1 is mounted on a blood glucose meter
- FIG. 5B is a partially omitted cross-sectional view showing a state in which blood is spotted on the measurement chip.
- FIG. 5C is a partially omitted cross-sectional view showing a state where the measurement chip is detached from the blood glucose meter.
- FIG. 6A is a graph for explaining the first calibration calibration curve data
- FIG. 6B is a graph for explaining the second calibration calibration curve data. It is a longitudinal cross-sectional view of the blood glucose meter which concerns on 2nd Embodiment of this invention, and the measuring chip with which the said blood glucose meter is mounted
- FIG. 8A is a partially omitted cross-sectional view showing a state where the measurement chip of FIG. 7 is attached to a blood glucose meter
- FIG. 8B is a partially omitted cross-sectional view showing a state where blood is spotted on the measurement chip. is there.
- the blood glucose meter 10A as the component measuring apparatus according to the first embodiment can be equipped with a measuring chip 12 as a test tool at the tip, and the blood sample collected in the measuring chip 12 This is a colorimetric blood glucose meter that optically measures glucose concentration (blood glucose level).
- the blood glucose meter 10A is mainly used as a personal use application that the user (patient) operates to measure blood glucose, but of course, it is also used as a medical facility application used by medical personnel without any special modification. Is possible.
- the measurement chip 12 is a so-called disposable product and is packaged individually or by a certain number of collections, and is taken out and attached to a blood glucose meter at every measurement.
- the measurement chip 12 includes a chip body 14.
- the tip body 14 is preferably formed in a tapered shape with a tapered tip so that blood can be spotted easily.
- the chip body 14 is formed in a quadrangular cross section, but the cross section may be formed in a circular shape or a polygonal shape (excluding the quadrangular shape) as long as a capillary phenomenon occurs. .
- the chip body 14 is made of, for example, polymethyl methacrylate, polystyrene, cyclic polyolefin, polycarbonate or other highly transparent resin material such as polycarbonate, glass, or quartz for light irradiation / light reception.
- the chip body 14 is formed with a blood introduction path 16 that is thin enough to suck blood by capillarity, and at the base end side of the wall surface constituting the blood introduction path 16, the blood sugar concentration is obtained by reacting with blood.
- a reagent (coloring reagent) 18 for applying a corresponding color is applied.
- the blood introduction path 16 is formed in a quadrangular shape as viewed from the extending direction, but may be formed in a circular shape or a polygonal shape (excluding the quadrangular shape).
- the chip body 14 may be divided (for example, divided into two equal parts) in the lateral direction. In this case, it is preferable because the reagent 18 can be easily applied to the wall surface constituting the blood introduction path 16.
- the blood glucose meter 10A according to this embodiment will be described.
- the side on which the measurement chip 12 is attached is referred to as “front end side”, and the opposite side is referred to as “base end side”.
- the blood glucose meter 10 ⁇ / b> A has a housing 20 that constitutes the appearance.
- the casing 20 is configured to have a narrow tip end side and a base end side that is easily gripped with one hand.
- an eject lever 22 for removing the measuring chip 12 from the blood glucose meter 10A, a display 24 composed of liquid crystal or LED, a power button 26 for turning on / off the blood glucose meter 10A, An operation button 28 is provided.
- the power supply 72 (see FIG. 3) of the blood glucose meter 10A is turned on, the display 24 is operated, and the measured blood glucose measurement value is displayed on the display 24.
- a tip mounting portion 32 in which an insertion hole 30 into which the measurement chip 12 can be inserted is formed in the front end side of the housing 20, and the blood collected in the measurement chip 12
- An optical measurement unit 34 for optically measuring the blood glucose level, a calibration member 36 disposed in the insertion hole 30, and the calibration member 36 are urged toward the insertion port (tip opening) 38 side of the insertion hole 30.
- An urging member (urging means) 40 is provided.
- the insertion hole 30 extends in the longitudinal direction of the housing 20 and is formed in a shape (rectangular shape) corresponding to the shape on the proximal end side of the measurement chip 12 when viewed from the extending direction. That is, since the measuring chip 12 is in contact with the wall surface constituting the insertion hole 30 while being inserted into the insertion hole 30, it is held at a predetermined measurement position by the frictional force (see FIGS. 5A and 5B). However, the blood glucose meter 10A may have a lock mechanism for holding the measurement chip 12 at a predetermined measurement position.
- the insertion hole 30 has a disposition hole 44 that is located on the proximal end side thereof and extends along the longitudinal direction of the housing 20 and is disposed with an eject pin (ejection portion) 42 connected to the eject lever 22. Communicate. That is, the eject pin 42 can slide in the extending direction of the insertion hole 30 by the operation of the eject lever 22 by the user.
- the width dimension of the arrangement hole 44 is formed smaller than the width dimension of the insertion hole 30, and thereby the bottom face 46 directed to the insertion port 38 of the insertion hole 30 at the boundary between the insertion hole 30 and the arrangement hole 44. Is formed.
- the optical measuring unit 34 includes a light emitting unit 52 disposed in a first chamber 50 that communicates with an introduction port 48 that opens in a wall surface that constitutes the insertion hole 30, and a current supply unit 54 that supplies a driving current to the light emitting unit 52 ( 3), a light receiving unit 60 disposed in the second chamber 58 communicating with the outlet 56 that opens to the wall surface that constitutes the insertion hole 30, and an A / A that converts the light reception signal of the light receiving unit 60 into a digital signal. And a D converter 62 (see FIG. 3).
- the first chamber 50 and the second chamber 58 are disposed so as to sandwich the insertion hole 30 from the direction orthogonal to the extending direction thereof, and the introduction port 48 and the outlet port 56 face each other.
- the light emitting unit 52 irradiates the measurement chip 12 with light having a second wavelength different from the first light emitting element 64 that irradiates the measurement chip 12 with light having the first wavelength.
- the 1st light emitting element 64 and the 2nd light emitting element 66 are arrange
- the first light emitting element 64 and the second light emitting element 66 are juxtaposed in a direction perpendicular to the paper surface.
- the 1st light emitting element 64 and the 2nd light emitting element 66 may be comprised by a light emitting diode (LED), for example.
- the first wavelength is a wavelength for detecting the color density of the reagent 18 according to the blood glucose level, and is, for example, 620 to 640 nm.
- the second wavelength is a wavelength for detecting the concentration of red blood cells in blood, and is, for example, 510 to 540 nm.
- the current supply unit 54 supplies a drive current to the first light emitting element 64 and the second light emitting element 66.
- the light receiving unit 60 is disposed at a position facing the outlet 56 in a state of being mounted on a control board (not shown).
- the light receiving unit 60 receives the transmitted light from the measuring chip 12, and may be configured by, for example, a photodiode (PD).
- PD photodiode
- the calibration member 36 is disposed in the insertion hole 30 so as to be slidable (slidable) along the insertion direction of the measuring chip 12 (extension direction of the insertion hole 30), and closes the introduction port 48 and the outlet port 56. It is made possible.
- the calibration member 36 transmits light emitted from the light emitting unit 52 (the first light emitting element 64 and the second light emitting element 66) and has a predetermined absorbance with respect to the light. In the present embodiment, the absorbance of the calibration member 36 with respect to the light is 1.
- Such a calibration member 36 can be made of, for example, acrylic resin, plastic such as polycarbonate, glass, quartz, or the like, which can be manufactured to have a certain absorbance by controlling optical characteristics.
- the biasing member 40 is interposed between the bottom surface 46 constituting the insertion hole 30 and the calibration member 36.
- the urging member 40 is fixed to the bottom surface 46 and the calibration member 36 so as to be elastically deformable along the extending direction of the insertion hole 30.
- the biasing member 40 is formed with an insertion passage 68 through which the eject pin 42 is inserted.
- the urging member 40 is a compression coil spring having an insertion passage 68 at the center, but may be a rubber cylinder, for example.
- the urging member 40 is a compression coil spring, the configuration of the urging member 40 is simplified, which is preferable.
- the calibration member 36 closes the inlet 48 and the outlet 56 in a state where the measurement chip 12 is not inserted into the insertion hole 30 and emits light from the light emitting unit 52.
- the blood glucose meter 10 ⁇ / b> A further includes a control unit 70, a power source 72, a chip mounting sensor 74, and a storage unit 76.
- the control unit 70 comprehensively controls the entire blood glucose meter 10A.
- a control unit 70 for example, a microcomputer is used, and a predetermined program is read and software processing is executed in cooperation with each functional unit. The detailed configuration of the control unit 70 will be described later.
- a button battery is used as the power source 72, and power is supplied to the control unit 70 under the action of the power button 26.
- the chip mounting sensor 74 detects whether or not the measuring chip 12 is mounted in the insertion hole 30.
- calibration curve data indicating the relationship between the absorbance and the blood glucose level, the absorbance and blood glucose level of the calibration member 36, the absorbance and blood glucose level of the unused measuring chip 12, and the like are stored in advance. .
- the storage unit 76 can store blood glucose measurement values and the like actually measured.
- the control unit 70 includes a calibration control unit 78, a blood glucose measurement calculation unit 80, and a display control unit 82.
- the calibration control unit 78 calibrates the blood glucose meter 10 ⁇ / b> A in order to reduce blood glucose level measurement errors due to changes in the light emitting unit 52 and the light receiving unit 60 over time.
- the calibration control unit 78 receives the first received light signal output from the A / D converter 62 when the transmitted light from the calibration member 36 is received by the light receiving unit 60 and the measurement chip 12 before collecting blood ( The blood glucose meter 10A is calibrated based on the second light receiving signal output from the A / D converter 62 when the light transmitted from the unreacted reagent 18) is received by the light receiving unit 60.
- the calibration control unit 78 calibrates the blood glucose meter 10A by correcting and updating the calibration curve data based on the first light reception signal and the second light reception signal (stored in the storage unit 76), for example. .
- the blood glucose measurement calculation unit 80 receives the third light receiving signal output from the A / D converter 62 when the light receiving unit 60 receives transmitted light from the measurement chip 12 (colored reagent 18) from which blood has been collected. Absorbance is calculated based on the second light reception signal described above, and a blood glucose measurement value is obtained by referring to the updated calibration curve data stored in the storage unit 76.
- the display control unit 82 displays the blood glucose measurement value calculated by the blood glucose measurement calculation unit 80 on the display 24.
- the blood glucose meter 10A is basically configured as described above, and the operation and effect thereof will be described below.
- the blood glucose meter 10A has a calibration member at a position where the inlet 48 and the outlet 56 are closed and the light from the light emitting unit 52 is irradiated in the initial state (the state where the measurement chip 12 is not inserted into the insertion hole 30). 36 is located (see FIG. 2). Thereby, since the penetration
- the control unit 70 determines whether or not the measurement chip 12 is not mounted on the chip mounting unit 32 based on the output signal of the chip mounting sensor 74 (step S2).
- step S2 NO
- the control unit 70 determines that the measurement chip 12 is mounted on the chip mounting unit 32 (step S2: NO)
- the control unit 70 indicates that (the measurement chip 12 is mounted on the chip mounting unit 32).
- Step S3 Specifically, for example, the display control unit 82 displays the fact on the display 24.
- an arbitrary method can be adopted as the notification method in step S3. For example, it may be notified to the user by voice.
- step S4 the control unit 70 performs first calibration control (step S4). That is, the current supply unit 54 alternately supplies current to the first light emitting element 64 and the second light emitting element 66.
- the first light emitting element 64 and the second light emitting element 66 alternately irradiate light to the calibration member 36, and the light receiving unit 60 receives the transmitted light from the calibration member 36, and has a size corresponding to the intensity of the transmitted light.
- the first light reception signal is output from the A / D converter 62 to the control unit 70.
- the calibration control unit 78 corrects the calibration curve data stored in the storage unit 76 based on the first light reception signal.
- the calibration control unit 78 calculates the absorbance of the calibration member 36 based on the first light reception signal, corrects the constant term of the initial calibration curve data based on the absorbance, and calculates the first calibration calibration curve data.
- the constant term of the initial calibration curve data is corrected so as to pass through the point P (x1, y1).
- x1 is the calculated absorbance of the calibration member 36
- y1 is the blood glucose level of the calibration member 36 stored in the storage unit 76 in advance.
- the first calibration calibration curve data is stored in the storage unit 76.
- the user mounts the measurement chip 12 on the chip mounting portion 32.
- the calibration member 36 pushed by the measuring chip 12 is displaced to the proximal end side while compressing the biasing member 40.
- the proximal end side of the measurement chip 12 closes the inlet 48 and the outlet 56 and light from the light emitting unit 52 can be irradiated (see FIG. 5A).
- the position of the measurement tip 12 is not shifted by the restoring force of the biasing member 40.
- control unit 70 determines whether or not the measurement chip 12 is mounted on the chip mounting unit 32 based on the output signal of the chip mounting sensor 74 (step S5).
- step S5 determines that the measurement chip 12 is not mounted on the chip mounting unit 32 (step S5: NO)
- the processing from step S4 described above is performed.
- step S6 when the control unit 70 determines that the measurement chip 12 is mounted on the chip mounting unit 32 (step S5: YES), the control unit 70 performs the second calibration control (step S6). That is, the current supply unit 54 alternately supplies current to the first light emitting element 64 and the second light emitting element 66.
- the first light emitting element 64 and the second light emitting element 66 alternately irradiate light onto the measurement chip 12 (unreacted reagent 18) before collecting blood, and the light receiving unit 60 transmits from the measurement chip 12.
- the light is received, and a second received light signal having a magnitude corresponding to the intensity of the transmitted light is output from the A / D converter 62 to the control unit 70.
- the calibration control unit 78 corrects the first calibration calibration curve data based on the second light reception signal.
- the calibration control unit 78 calculates the absorbance of the measurement chip 12 before collecting blood based on the second light reception signal, and corrects the slope of the first calibration calibration curve data based on the absorbance.
- the slope of the first calibration calibration curve data is corrected so as to pass through the point Q (x0, y0) in addition to the above-described point P (x1, y1).
- x0 is the calculated absorbance of the measurement chip 12
- y0 is the blood glucose level of the measurement chip 12 stored in the storage unit 76 in advance.
- the second calibration calibration curve data and the second light reception signal are stored in the storage unit 76. Further, the first light emitting element 64 and the second light emitting element 66 continue to irradiate the measurement chip 12 after the second calibration control.
- a part of the user's body (for example, the finger 84) is punctured with a puncture device (not shown), and a small amount of blood (for example, about 0.3 to 1.5 ⁇ L) is allowed to flow out onto the skin.
- a puncture device not shown
- a small amount of blood for example, about 0.3 to 1.5 ⁇ L
- the tip of the measurement chip 12 is spotted on the blood that has flowed out (step S7).
- blood is sucked into the blood introduction path 16 by capillary action and reacts with the reagent 18, and the reagent 18 is colored according to the blood sugar level.
- the light from the first light emitting element 64 and the second light emitting element 66 is alternately irradiated on the measurement chip 12 from which the blood has been collected, and the light receiving unit 60 displays the measurement chip 12 (presentation).
- the transmitted light from the colored reagent 18) is received, and a third received light signal having a magnitude corresponding to the intensity of the transmitted light is output from the A / D converter 62 to the control unit 70.
- the blood glucose measurement calculation unit 80 calculates the absorbance from the above-described second light reception signal and third light reception signal.
- the second light receiving signal of the light emitted from the first light emitting element 64 and the third light receiving signal of the light emitted from the first light emitting element 64 are used to calculate the absorbance related to the first wavelength, and the second The absorbance related to the second wavelength is calculated from the second light receiving signal of the light emitted from the light emitting element 66 and the third light receiving signal of the light emitted from the second light emitting element 66.
- the blood glucose measurement calculation unit 80 obtains a blood glucose measurement value by referring to the absorbance related to the first wavelength calculated from the second light reception signal and the third light reception signal and the second calibration calibration curve data, The blood component is corrected based on the absorbance related to the second wavelength calculated from the received light signal and the third received light signal, and a final blood glucose measurement value is obtained (step S8).
- the display control unit 82 displays the blood glucose measurement value on the display 24 (step S9). Further, the user removes the used measuring chip 12 from the chip mounting portion 32 by operating the eject lever 22 (step S10).
- the eject pin 42 is displaced (slid) to the insertion port 38 side through the insertion path 68 of the biasing member 40, and the measuring chip 12 is moved by the eject pin 42 through the calibration member 36. Extruded (see FIG. 5C). After the measurement chip 12 is removed from the insertion hole 30, the calibration member 36 displaced to the vicinity of the insertion port 38 returns to a position where the introduction port 48 and the discharge port 56 are closed by the restoring force of the biasing member 40.
- the introduction port 48 and the discharge port 56 are closed by the calibration member 36 in the initial state where the measurement chip 12 is not inserted into the insertion hole 30, the insertion hole 30. Even without providing a cover member for suppressing entry of foreign matter into the body, entry of foreign matter from the outside into the inlet 48 and outlet 56 is suppressed. Therefore, it is possible to improve work efficiency (no need to attach / detach the cover member) and to suppress contamination of the light emitting unit 52 and the light receiving unit 60 due to foreign matter.
- the calibration member 36 is held by the urging member 40 at a position where the light from the light emitting unit 52 (the first light emitting element 64 and the second light emitting element 66) is irradiated.
- the first calibration calibration curve data can be obtained based on the first received light signal by the first calibration control.
- the calibration member 36 slides to the opposite side of the insertion port 38 and the measurement chip 12 is irradiated with the light from the light emitting unit 52, so that the second calibration control is performed.
- the second calibration calibration curve data can be obtained by correcting the first calibration calibration curve data based on the second light receiving signal.
- the blood glucose meter 10A is calibrated at two points each time blood glucose measurement is performed, so that the blood glucose meter 10A can be appropriately calibrated. Further, by spotting blood on the measuring chip 12 inserted into the insertion hole 30, the blood glucose level is obtained based on the absorbance calculated from the second light receiving signal and the third light receiving signal and the second calibration calibration curve data. Therefore, it is possible to measure with high accuracy.
- the calibration member 36 when the user operates the eject lever 22 to displace the eject pin 42 toward the insertion port 38, the calibration member 36 is slid toward the insertion port 38, and the measurement chip 12 can be easily removed from the insertion hole 30. And it can remove reliably. Moreover, according to such a structure, when removing the measurement chip
- the eject pin 42 can be guided to the calibration member 36 through the insertion path 68 of the biasing member 40 provided on the opposite side of the insertion port 38 with respect to the calibration member 36 in the insertion hole 30, The total size of 10A can be reduced. Furthermore, since the biasing member 40 is a compression coil spring, the configuration of the biasing member 40 can be simplified.
- a blood glucose meter 10B as a component measuring apparatus As a second embodiment of the present invention will be described.
- the same components as those in the blood glucose meter 10A described above are denoted by the same reference numerals, and detailed description thereof is omitted.
- the blood glucose meter 10B is a colorimetric blood glucose meter that optically reflects and measures the blood glucose level in the blood collected in the measuring chip 90.
- the measurement chip 90 used in the blood glucose meter 10B will be described.
- the measurement chip 90 is different from the measurement chip 12 described above in that a reflection portion (reflection film) 92 that reflects light is formed on a portion of the wall surface constituting the blood introduction path 16 that faces the reagent 18.
- the reflector 92 is a scattering structure formed by depositing or applying a predetermined material to a portion of the wall surface constituting the blood introduction path 16 that faces the reagent 18 by means of, for example, vacuum deposition, sputtering, or plating. It is a reflective surface.
- the predetermined material include metals such as aluminum, nickel, and chromium, or white powders such as barium sulfate, titanium oxide, and silicon dioxide.
- the chip body 14 can be divided in the short direction (for example, divided into two equal parts), the formation of the reflecting portion 92 and the application of the reagent 18 can be suitably performed.
- the blood glucose meter 10B is different from the optical measurement unit 34 of the blood glucose meter 10A described above in the configuration of the optical measurement unit 94.
- one opening 96 is formed by the introduction port 48 and the outlet 56 that open on the wall surface that constitutes the insertion hole 30, and light is emitted to the chamber 98 that communicates with the opening 96.
- the part 52 and the light receiving part 60 are arranged. That is, the light emitting part 52 (the first light emitting element 64 and the second light emitting element 66) and the light receiving part 60 are arranged at a position facing the opening 96 while being mounted on a control board (not shown).
- the calibration member 100 reflects light emitted from the light emitting unit 52 and has a predetermined absorbance with respect to the light.
- a calibration member 100 is, for example, a reflective ND filter in which a chrome thin film is coated on a glass substrate, or a plastic having a known absorbance that appropriately contains a dye, pigment, filler, or the like whose one side is mirror-finished with a metal thin film. Can be configured.
- the calibration member 100 closes the opening 96 in a state where the measurement chip 90 is not inserted into the insertion hole 30 and is positioned at a position where light from the light emitting unit 52 is irradiated. It is held by the urging member 40 and slides to the opposite side of the insertion port 38 so that the light from the light emitting part 52 is irradiated to the measurement chip 90 as the measurement chip 90 is inserted into the insertion hole 30 ( (See FIG. 8A).
- the blood glucose meter 10B having such a configuration basically performs blood glucose measurement according to the flowchart of FIG.
- the change of the content of step S4, step S6, and step S8 is demonstrated easily.
- the light receiving unit 60 receives the reflected light from the calibration member 100, and the first has a magnitude corresponding to the intensity of the reflected light.
- a light reception signal is output from the A / D converter 62 to the control unit 70.
- the calibration control part 78 performs the process similar to step S4 of 1st Embodiment mentioned above, correct
- the second calibration control (step S6), the reflected light from the measuring chip 90 before collecting blood is received, and the second calibration having a magnitude corresponding to the intensity of the reflected light.
- a light reception signal is output from the A / D converter 62 to the control unit 70.
- the calibration control part 78 performs the process of the 2nd calibration control of 1st Embodiment mentioned above, correct
- the light receiving unit 60 receives the reflected light from the measuring chip 90 from which the blood is collected, and has a size corresponding to the intensity of the reflected light.
- the third light reception signal is output from the A / D converter 62 to the control unit 70.
- the blood glucose measurement calculation unit 80 obtains a blood glucose measurement value by referring to the absorbance relating to the first wavelength calculated from the second light reception signal and the third light reception signal and the second calibration calibration curve data, The blood component is corrected based on the absorbance related to the second wavelength calculated from the received light signal and the third received light signal, and a final blood glucose measurement value is obtained.
- the same effect as the blood glucose meter 10A according to the first embodiment described above can be obtained.
- the blood glucose meters 10A and 10B and the blood glucose measurement method using the blood glucose meters 10A and 10B are not limited to the examples described above.
- the first light reception signal having a size corresponding to the light from the calibration members 36 and 100 is stored in the storage unit 76, and in step S6, the measurement chips 12 and 90 before blood collection is performed.
- the calibration curve data may be obtained by correcting the initial calibration curve data based on the second light reception signal having a magnitude corresponding to the light from the first light reception signal and the first light reception signal stored in the storage unit 76. . Even in this case, since the initial calibration curve data can be calibrated at two points, the blood glucose meters 10A and 10B can be appropriately calibrated.
- the calibration control unit 78 corrects at least one of the light emitting unit 52 and the light receiving unit 60 based on the first light receiving signal and the second light receiving signal without correcting the calibration curve data, thereby correcting the blood glucose meter 10A, It is also possible to calibrate 10B.
- the calibration control unit 78 calculates the absorbance of the calibration members 36 and 100 based on the first light reception signal. Then, at least one of the light emitting unit 52 and the light receiving unit 60 is corrected so that the calculated absorbance matches the absorbance of the calibration members 36 and 100 stored in the storage unit 76.
- the calibration control unit 78 controls the current supply unit 54 to adjust the drive current value supplied to the first light emitting element 64 and the second light emitting element 66. Specifically, the calibration control unit 78 adjusts the drive current value supplied to the first light emitting element 64 based on the absorbance related to the first wavelength calculated from the first light reception signal, and calculates from the first light reception signal. The drive current value supplied to the second light emitting element 66 is adjusted based on the absorbance for the second wavelength. On the other hand, when correcting the light receiving unit 60, the calibration control unit 78 adjusts the sensitivity of the light receiving unit 60.
- control part 70 computes the light absorbency of calibration members 36 and 100 based on the 2nd received light signal. As in the first calibration control, at least one of the light emitting unit 52 and the light receiving unit 60 is corrected so that the calculated absorbance matches the absorbance of the calibration member 36 stored in the storage unit 76. To do.
- the blood glucose meters 10A and 10B are calibrated by correcting at least one of the light emitting unit 52 and the light receiving unit 60, the calibration member 36 and the measurement chip 12 before acquiring blood are used. By performing the two-point calibration used (calibration twice), the blood glucose meters 10A and 10B can be appropriately calibrated.
- step S4 it is possible to perform the first calibration control in step S4 and omit the second calibration control in step S6.
- control of blood glucose meter 10A, 10B can be simplified.
- step S6 the control unit 70 needs to detect the second light reception signal (background correction data) used for calculating the blood glucose measurement value.
- the component measuring apparatus is not limited to the above-described embodiment, and various configurations can be adopted without departing from the gist of the present invention.
- the blood glucose meter that measures the blood glucose level in the blood has been described.
- the component measuring device may be any device that measures a predetermined component in body fluids other than blood (for example, in urine).
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Abstract
Description
図1に示すように、第1実施形態に係る成分測定装置としての血糖計10Aは、先端に試験具として測定用チップ12が装着可能であって、測定用チップ12に採取された血液中のグルコース濃度(血糖値)を光学的に透過計測する比色式の血糖計である。
次に、本発明の第2実施形態に係る成分測定装置としての血糖計10Bについて説明する。なお、本実施形態に係る血糖計10Bにおいて、上述した血糖計10Aと同一の構成要素には同一の参照符号を付し、詳細な説明は省略する。
Claims (7)
- 測定用チップ(12、90)に採取された体液中の所定成分を測定する成分測定装置(10A、10B)であって、
前記測定用チップ(12、90)が挿入可能な挿入孔(30)が形成されたチップ装着部(32)と、
前記挿入孔(30)を構成する壁面に開口する導入口(48)を通り前記測定用チップ(12、90)に光を照射する発光部(52)と、
前記挿入孔(30)を構成する壁面に開口する導出口(56)を通り導かれる前記測定用チップ(12、90)からの光を受光する受光部(60)と、
前記測定用チップ(12、90)の挿入方向に沿ってスライド可能に前記挿入孔(30)に配設された較正部材(36、100)と、
前記較正部材(36、100)を前記挿入孔(30)の前記挿入口(38)側に向けて付勢する付勢手段(40)と、
を備え、
前記較正部材(36、100)は、前記測定用チップ(12、90)が前記挿入孔(30)に挿入されていない状態で前記導入口(48)及び前記導出口(56)を閉塞すると共に前記発光部(52)からの光が照射される位置に前記付勢手段(40)によって保持され、前記測定用チップ(12、90)の前記挿入孔(30)への挿入に伴って前記測定用チップ(12、90)に前記発光部(52)からの光が照射されるように前記挿入口(38)とは反対側にスライドする、
ことを特徴とする成分測定装置(10A、10B)。 - 請求項1記載の成分測定装置(10A、10B)において、
前記較正部材(36、100)からの光を受光した前記受光部(60)の受光信号と前記体液を採取する前の前記測定用チップ(12、90)からの光を受光した前記受光部(60)の受光信号とに基づいて、前記成分測定装置(10A、10B)を較正する較正制御部(78)をさらに備える、
ことを特徴とする成分測定装置(10A、10B)。 - 請求項1記載の成分測定装置(10A、10B)において、
前記較正部材(36、100)を前記挿入口(38)側にスライドさせて前記測定用チップ(12、90)を前記挿入孔(30)から取り外すイジェクト部(42)をさらに備えることを特徴とする成分測定装置(10A、10B)。 - 請求項3記載の成分測定装置(10A、10B)において、
前記付勢手段(40)は、前記挿入孔(30)のうち前記較正部材(36、100)に対して前記挿入口(38)とは反対側に設けられると共に前記イジェクト部(42)が挿通する挿通路(68)を有していることを特徴とする成分測定装置(10A、10B)。 - 請求項4記載の成分測定装置(10A、10B)において、
前記付勢手段(40)は、中心に前記挿通路(68)を有する圧縮コイルばねであることを特徴とする成分測定装置(10A、10B)。 - 請求項1記載の成分測定装置(10A)において、
前記導入口(48)と前記導出口(56)とが対向して形成されており、
前記受光部(60)は、前記較正部材(36、100)又は前記測定用チップ(12、90)からの透過光を受光することを特徴とする成分測定装置(10A)。 - 請求項1記載の成分測定装置(10B)において、
前記導入口(48)と前記導出口(56)とで1つの開口部(96)が形成されており、
前記受光部(60)は、前記較正部材(36、100)又は前記測定用チップ(12、90)からの反射光を受光することを特徴とする成分測定装置(10B)。
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EP3605069A4 (en) * | 2017-03-23 | 2021-01-06 | Terumo Kabushiki Kaisha | DEVICE FOR MEASURING A COMPONENT AND SET OF MEASURING DEVICES FOR A COMPONENT |
JP7155109B2 (ja) | 2017-03-23 | 2022-10-18 | テルモ株式会社 | 成分測定装置及び成分測定装置セット |
US11703456B2 (en) | 2017-03-23 | 2023-07-18 | Terumo Kabushiki Kaisha | Component measurement device and component measurement device set |
Also Published As
Publication number | Publication date |
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CN106164652A (zh) | 2016-11-23 |
CN106164652B (zh) | 2018-11-09 |
EP3124957A1 (en) | 2017-02-01 |
JP6521946B2 (ja) | 2019-05-29 |
US10451629B2 (en) | 2019-10-22 |
EP3124957B1 (en) | 2018-12-05 |
JPWO2015146238A1 (ja) | 2017-04-13 |
US20170010273A1 (en) | 2017-01-12 |
EP3124957A4 (en) | 2017-12-13 |
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