JP2012105809A - Biological component measuring device and biological component measuring method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a biological component measuring device which has a small size, and can easily perform high accuracy measuring with few possibility of giving pain to a patient, and to provide a biological component measuring method.SOLUTION: The biological component measuring device includes: an examination head 11 in contact with a living body surface; and a control part 21 which measures a biocomponent based on a signal outputted from the examination head 11. The examination head 11 includes: a first pinch section 13a and a second pinch section 13b, which pinch a living body surface to be upheaved; a distance adjustment section 14 which is controlled by the control part 21, and in which a distance between the first pinch section 13a and the second pinch section 13b is changed; optical projection sections 16a, 16b, and 17 which project light on the living body surface of a part which has been pinched between the first pinch section 13a and the second pinch section 13b, and upheaved; and light-receiving sections 18a, 18b, 19a, and 19b which output a signal according to a quantity of light having permeated the living body surface of a part which has been upheaved.

Description

  The present invention relates to a biological component measuring apparatus and a biological component measuring method.

  Information such as blood pressure, blood oxygen saturation, and blood glucose level is important for knowing the patient's condition, and also serves as a material for determining the timing of medication. In general, biological information such as blood oxygen saturation and blood glucose level is obtained from blood collected from the living body, and blood collection needles (blood collection needles) are always inserted into the human body in patients admitted to the hospital. The blood is collected regularly. In addition, in the case of a diabetic patient undergoing outpatient treatment, blood must be collected and examined about 3 to 4 times a day.

  However, blood collection with a needle is accompanied by mental and physical pain. For this reason, a non-invasive method for measuring biological components has been proposed. For example, a method of measuring a blood glucose level from the intensity of transmitted light by irradiating a finger or the like with light having a wavelength in the near infrared region is known.

JP 2004-147706 A WO2006 / 040841 JP 2004-290226 A JP-A-11-178799 JP-A-8-189891

  It is an object of the present invention to provide a biological component measuring apparatus and a biological component measuring method that are small and can easily measure with high accuracy and are less likely to cause pain to the patient.

  According to one aspect of the disclosed technique, the test head includes a test head that contacts the surface of the living body, and a control unit that measures a biological component based on a signal output from the test head, and the test head includes the biological surface. A first sandwiching portion and a second sandwiching portion that are raised by sandwiching the first sandwiching portion, a distance adjusting portion that is controlled by the control unit to change a distance between the first sandwiching portion and the second sandwiching portion, and A light projection unit for projecting light onto a living body surface of a raised portion sandwiched between the first sandwiching portion and the second sandwiching portion, and a signal corresponding to the amount of light transmitted through the living body surface of the raised portion A biological component measuring device having a light receiving unit that outputs a signal is provided.

  The biological component measuring apparatus according to the above aspect can reduce noise components due to arterial pulsation, and can accurately measure biological components. In addition, the device can be easily downsized and can be used by outpatients in daily life. Furthermore, since it is not necessary to insert a blood collection needle into the human body and the biological component can be measured without stopping the blood flow, there is little risk of pain to the patient.

FIG. 1 is a diagram illustrating the configuration of the biological component measurement apparatus according to the first embodiment. FIG. 2 is an explanatory diagram for explaining biological component measurement using the biological component measuring apparatus according to the first embodiment. FIG. 3 is a top view showing a state where a finger is placed on the inspection head. FIG. 4 is a schematic cross-sectional view showing the structure of the skin. FIG. 5 is a flowchart illustrating the biological component measurement method according to the first embodiment. FIG. 6 is a diagram for explaining the inspection head of the biological component measuring apparatus according to the second embodiment. FIG. 7 is a diagram illustrating a state where the skin of the subject is raised by the finger of the subject being pressed by the end face of the inspection head of the biological component measurement apparatus according to the second embodiment. FIG. 8 is a diagram illustrating the configuration of the biological component measurement apparatus according to the third embodiment. FIG. 9 is a diagram illustrating a state in which a subject's finger is sandwiched by the inspection head of the biological component measurement apparatus according to the third embodiment. FIG. 10 is a flowchart for explaining the operation of the biological component measurement apparatus according to the third embodiment.

  Hereinafter, before describing the embodiment, a preliminary matter for facilitating understanding of the embodiment will be described.

  Conventionally, there has been a method of irradiating a human body (for example, a finger) with two or more near-infrared lights having different wavelengths, detecting light transmitted through the human body at two locations, and calculating the concentration of glucose in the blood from the ratio of the amount of transmitted light. Are known. However, in this method, stains on the skin surface, absorption and scattering of light by melamine, subcutaneous fat and bone, muscle movement, arterial pulsation, and the like cause disturbances, and the SN (signal / noise) ratio is low.

  In view of this, it has been proposed to transmit near-infrared light to a portion that is swollen by sucking the surface of a living body with a pump, and to measure a biological component (glycose) from the amount of transmitted light. The sensitivity of the detection of glycose by near-infrared light is related to the blood volume of the part through which the near-infrared light passes, but this method increases the blood volume because the blood accumulates in the part that has been sucked and swollen, and the noise component is relative. Decrease.

  However, in the method using the above-described suction pump, since the vibration noise of the pump is added, the SN ratio is not sufficiently reduced. Moreover, although the apparatus becomes large due to the suction pump and can be used for measurement in a hospital or the like, it is difficult for the outpatient to use in daily life.

  Furthermore, since the above-described method sucks the living body surface to make it congested, it is not preferable to use it for a patient who is anxious about blood vessels. For example, a diabetic patient may have a vascular disorder (complications that cause blood vessels to fall apart, specifically diabetic retinopathy, diabetic nephropathy, diabetic gangrene, etc.) and stress the blood vessels. Should be avoided as much as possible.

  Therefore, there is a demand for a biological component measuring apparatus that is small in size and can perform high-accuracy measurement and has a low load on blood vessels. Hereinafter, embodiments will be described.

(First embodiment)
FIG. 1 is a diagram illustrating the configuration of the biological component measurement apparatus according to the first embodiment.

  As shown in FIG. 1, the biological component measurement apparatus according to the present embodiment includes an inspection head 11 that makes a part of a living body (for example, a finger or an arm) contact, and a control unit 21 that is connected to the inspection head 11. is doing. A substantially rectangular groove 12 is formed in the center of the inspection head 11, and rod-like pressing members 13 a and 13 b are arranged at positions sandwiching the groove 12 with the longitudinal direction thereof parallel to the surface of the inspection head 11. Yes. The pressing members 13a and 13b are supported by piezoelectric elements 14 arranged at both ends in the longitudinal direction. The pressing members 13a and 13b are examples of the first sandwiching portion and the second sandwiching portion, and the piezoelectric element 14 is an example of the distance adjusting portion.

  When a voltage is applied to the piezoelectric elements 14 from the control unit 21, the piezoelectric elements 14 expand and contract, the pressing members 13a and 13b move in a direction parallel to the surface of the inspection head 11, and the distance between the pressing members 13a and 13b is increased. Change. A part of the living body is placed between the pressing members 13a and 13b, and the biological components in the blood are measured. In this embodiment, it is assumed that a finger is placed between the pressing members 13a and 13b.

  A groove 15a communicating with the groove 12 is formed on the side where the pressing member 13a is disposed, and light sources 16a and 16b and a projection lens 17 are disposed in the groove 15a. A groove 15b communicating with the groove 12 is also formed on the side where the pressing member 13b is disposed, and light receiving lenses 18a and 18b and light receiving elements 19a and 19b are disposed in the groove 15b.

  The light sources 16a and 16b are turned on by the power supplied from the control unit 21 and generate light having different wavelengths. Light generated by the light sources 16a and 16b is mixed by the mixer, transmitted to the projection lens 17, and projected by the projection lens 17 toward the light receiving lenses 18a and 18b disposed on the opposite side of the groove 12.

  In FIG. 1, the number of light sources is two, but the number of light sources may be three or more. In the case of a light source that generates light having two or more different wavelengths, the number of light sources may be one. As the light source, a semiconductor laser, a light emitting diode, or the like can be used. In the present embodiment, it is assumed that the light source 16a mainly generates light having a wavelength of 940 nm, and the light source 16b mainly generates light having a wavelength of 1130 nm.

  The light receiving lenses 18 a and 18 b are arranged at positions separated from each other along the side of the groove 12 and receive light projected by the projection lens 17. Light received by the light receiving lenses 18a and 18b is transmitted to the light receiving elements 19a and 19b, and an electric signal corresponding to the amount of received light is output from the light receiving elements 19a and 19b.

  The control unit 21 processes signals output from the light receiving elements 19a and 19b, and measures components contained in the blood of the living body, such as glycose.

  FIG. 2 is an explanatory view for explaining biological component measurement using the above-described biological component measuring apparatus, and FIG. 3 is a top view showing a state where a finger is placed on the inspection head 11. FIG. 4 is a schematic cross-sectional view showing the structure of the skin. Hereinafter, with reference to these drawings, biological component measurement using the biological component measuring apparatus according to the present embodiment will be described.

  First, as shown in FIGS. 2A and 3, the subject's finger is lightly placed on the groove 12 of the inspection head 11. At this time, no voltage is applied to the piezoelectric element 14, and the pressing members 13a and 13b are sufficiently separated. In this state, the light projected by the projection lens 17 reaches the light receiving lenses 18a and 18b without passing through the skin. The light quantity at this time (outputs of the light receiving elements 19a and 19b) is stored in the control unit 21 as an initial light quantity. The initial light amount may be acquired before the subject places his finger on the inspection head 11.

  Next, when a low voltage is applied from the control unit 21 to the piezoelectric element 14, the piezoelectric element 14 expands and the pressing members 13a and 13b move toward each other as shown in FIG. Thereby, a finger is pinched between the pressing members 13a and 13b, and the skin is slightly raised. In this case, the light projected by the projection lens 17 passes through the epidermis.

  As shown in FIG. 4, spots (shaded portions in FIG. 4) and melamine may exist in the epidermis, and light projected by the projection lens 17 is absorbed or scattered by these spots and melamine. In addition, since there are no blood vessels in the epidermis, it is impossible to detect biological components (such as glycolose) in the blood from light that has passed through only the epidermis.

  Next, when a medium voltage is applied from the control unit 21 to the piezoelectric element 14, the space between the pressing members 13a and 13b is reduced as shown in FIG. As a result, the light projected by the projection lens 17 passes through the dermis. Since the dermis has a vein, light is absorbed or scattered by biological components in the blood flowing through the vein. Therefore, it becomes possible to detect a biological component in blood from light that has passed through the dermis.

  Next, when a high voltage is applied to the piezoelectric element 14, as shown in FIG. 2D, the interval between the pressing members 13a and 13b is narrowed and the skin is further raised. As a result, the light projected by the projection lens 17 passes through the subcutaneous tissue as well as the epidermis and dermis. In this case, since there is an artery in the subcutaneous tissue, the outputs of the light receiving elements 19a and 19b change according to the pulsation of the artery.

  Arterial pulsation becomes a noise component when measuring biological components in blood. When the change in the amount of received light due to the pulsation of the artery (the pulsation of the outputs of the light receiving elements 19a and 19b) is small, the influence on the measurement accuracy is small, but when the change in the amount of received light exceeds a certain level, the measurement accuracy of the biological component is significantly reduced. . For this reason, in the present embodiment, a change in the amount of received light due to the pulsation of the artery is detected, and when the change in the amount of received light (pulsation component) is greater than a certain level, the voltage applied to the piezoelectric element 14 is reduced so Do not pass through.

  FIG. 5 is a flowchart illustrating the biological component measurement method according to this embodiment. This flowchart represents the operation of the control unit 21. Here, ten levels of voltage are set as the voltage applied to the piezoelectric element 14 from the lowest voltage (first voltage) to the highest voltage (tenth voltage), and the control unit 21 applies these voltages to the piezoelectric element 14. The voltage is applied stepwise.

  First, in step S11, the control unit 21 acquires an initial light amount. That is, the control unit 21 supplies power to the light sources 16a and 16b to light them. And the control part 21 memorize | stores the signal output from the light receiving elements 19a and 19b at this time as an initial light quantity. As described above, the initial light amount is acquired when the subject places a finger lightly on the inspection head 11 or before the subject places the finger on the inspection head 11.

  Next, in step S12, the control unit 21 applies a first voltage to the piezoelectric element 14 to reduce the distance between the pressing members 13a and 13b by one step. As a result, the surface of the subject's finger is slightly raised.

  Next, in step S13, the control unit 21 determines whether or not the voltage applied to the piezoelectric element 14 is an upper limit value (tenth voltage). Here, when it is determined that the upper limit value is reached (in the case of YES), the process proceeds to step S17, and when it is determined that it is not the upper limit value (in the case of NO), the process proceeds to step S14.

  In step S14, the control unit 21 acquires the outputs (light reception amounts) of the light receiving elements 19a and 19b. In this case, the control unit 21 monitors the outputs of the light receiving elements 19a and 19b for a predetermined time. In step S15, the control unit 21 determines whether there is a large pulsation in the outputs of the light receiving elements 19a and 19b. When it is determined that there is a large pulsation in the outputs of the light receiving elements 19a and 19b (in the case of YES), that is, when it is considered that light passes through the subcutaneous tissue, the process proceeds from step S15 to step S17. On the other hand, when it is determined that there is no pulsation or the pulsation is sufficiently small (in the case of NO), that is, when it is considered that light is not transmitted through the subcutaneous tissue, the process proceeds from step S15 to step S16.

  In step S16, the control unit 21 determines whether or not the output (light reception amount) of the light receiving elements 19a and 19b is sufficient. If it is determined that it is sufficient, the process proceeds to step S12, the voltage applied to the piezoelectric element 14 is increased by one step, the distance between the pressing members 13a and 13b is reduced by one step, and then the above-described processing is repeated. On the other hand, if it is determined in step S16 that the amount of light is not sufficient, the process proceeds to step S17.

  In step S <b> 17, the control unit 21 decreases the voltage applied to the piezoelectric element 14 by one step and increases the distance between the pressing members 13 a and 13 b by one step. In step S18, the amount of received light is acquired from the light receiving elements 19a and 19b, and the biological component is calculated in step S19. For the calculation of the biological component, the initial light amount acquired in step S11 and the light amount acquired in step S18 are used. Since the method of calculating the biological component from these light quantities is known (see, for example, Patent Document 2), the description thereof is omitted here.

  As described above, in the present embodiment, the distance between the pressing members 13a and 13b is reduced until light passes through the subcutaneous tissue. When it is detected that light has passed through the subcutaneous tissue due to the pulsation of the outputs of the light receiving elements 19a and 19b, the interval between the pressing members 13a and 13b is slightly widened so that the light does not pass through the subcutaneous tissue. Thereafter, the received light amounts of the light receiving elements 19a and 19b are acquired, and the biological component is calculated from the received light amount and the initial light amount at this time. Thereby, the noise component due to the pulsation of the artery can be reduced, and the biological component in the blood flowing through the vein in the dermis can be accurately measured.

  Moreover, since the biological component measuring device according to the present embodiment does not require a suction pump that causes noise, the measurement accuracy is high. Furthermore, since a suction pump is not required, the apparatus can be easily downsized and can be used by outpatients in daily life.

  Furthermore, in the present embodiment, although the surface of the living body is raised by being sandwiched between the pressing members 13a and 13b, the blood flow is not stopped, so that even a patient with a vascular disorder can use it safely. it can.

  In the above-described embodiment, even when YES is determined in step S13 and NO is determined in step S16, the process proceeds to step S17 and the distance between the pressing members 13a and 13b is increased by one step, and step S18, The biological component is measured in S19. However, if YES is determined in step S13 and NO is determined in step S16, an error may be displayed because the measurement accuracy may not be sufficient. If an error is displayed, the measurement site may be changed and measurement may be performed again.

  In the above-described embodiment, the pressing members 13a and 13b are driven by the piezoelectric element 14, but the pressing members 13a and 13b may be driven by other methods. For example, the pressing members 13a and 13b may be driven by combining a motor and a gear.

(Second Embodiment)
FIG. 6 is a view for explaining an inspection head of the biological component measuring apparatus according to the second embodiment. Note that this embodiment is different from the first embodiment in that the shape of the inspection head is different, and other configurations are basically the same as those in the first embodiment. The description of the same parts as those of the embodiment is omitted.

  In the biological component measuring apparatus according to the present embodiment, the inspection head 31 has a “C” shape, and the inspection head 31 is used by being put on the finger of the subject. A light projection unit 33a including a light source and a projection lens is disposed on one of the two end surfaces 31a and 31b facing each other of the inspection head 31, and a light receiving lens and a light receiving element are disposed on the other surface. A light receiving portion 33b is arranged.

  A piezoelectric element 32 is disposed on the inner peripheral side of the inspection head 31. When a voltage is applied to the piezoelectric element 32 from the control unit (see FIG. 1), the diameter of the inspection head 31 is reduced, and the finger of the subject is pressed by the end surfaces 31a and 31b of the inspection head 31, as shown in FIG. The skin is raised. A control part irradiates the light emitted from the light projection part 33a to the part which this skin raised, and calculates a biological component from the output of the light-receiving part 33b. Since the operation of the control unit is basically the same as that of the first embodiment (see FIG. 5), description thereof is omitted here.

  In this embodiment, the same effect as that of the first embodiment is obtained.

(Third embodiment)
FIG. 8 is a diagram illustrating the configuration of the biological component measurement apparatus according to the third embodiment.

  As shown in FIG. 8, the biological component measurement apparatus according to the present embodiment includes a test head 41 and a control unit 51 connected to the test head 41.

  The inspection head 41 includes a first arm 42 a, a second arm 42 b, and an angle adjustment unit (an example of a connection unit) 43. The angle adjusting unit 43 is disposed at the ends of the arms 42a and 42b and rotatably supports the arms 42a and 42b, and adjusts the angle between the arms 42a and 42b by a signal from the control unit 51.

  As illustrated in FIG. 9, the inspection head 41 is used with a measurement region sandwiched between the tips of the arms 42 a and 42 b (the end opposite to the angle adjusting unit 43). In FIG. 9, the skin of the subject's finger is sandwiched by the inspection head 41, but a portion other than the finger may be used as the measurement site.

  A light projection unit 44a and an actuator 45a are arranged at the tip of the first arm 42a. The light projection unit 44a includes a plurality of light sources (not shown) that generate light of different wavelengths by the power supplied from the control unit 51, and a projection lens (not shown) that projects the light emitted from these light sources. Z).

  In addition, a light receiving portion 44b and an actuator 45b are disposed at the tip of the second arm 42b. The light receiving unit 44b includes a plurality of light receiving lenses (not shown) that are spaced apart from each other, and a plurality of light receiving elements (not shown) through which light received by these light receiving lenses is individually transmitted. Have. Outputs of these light receiving elements are transmitted to the control unit 51.

  The actuator 45a of the first arm 42a and the actuator 45b of the second arm 42b are respectively arranged so that the optical axis of the light projection unit 44a and the optical axis of the light receiving unit 44b coincide with each other in accordance with a signal from the control unit 51. The angles of the light projection unit 44a and the light receiving unit 44b are changed. As the actuators 45a and 45b, for example, piezoelectric elements can be used.

  The angle adjustment unit 43 is provided with an actuator that changes the angle formed by the first arm 42a and the second arm 42b in accordance with a signal from the control unit 51. As this actuator, for example, a geared motor can be used.

  FIG. 10 is a flowchart for explaining the operation of the biological component measuring apparatus according to this embodiment.

  First, in step S21, the control unit 51 acquires an initial light amount. That is, the control unit 51 supplies power to the light projection unit 42a to generate light, and stores a signal output from the light receiving unit 42b as an initial light amount. At this time, the control unit 51 controls the angle adjustment unit 43 to set the angle between the arms 42a and 42b to a predetermined angle, and controls the actuators 45a and 45b to change the optical axes of the light projection unit 44a and the light receiving unit 45b. Match. The initial light amount is acquired when the inspection head 41 is lightly brought into contact with the skin of the subject or before the inspection head 41 is brought into contact with the subject.

  Next, in step S22, the control unit 41 drives the angle adjustment unit 43 to reduce the angle between the arms 42a and 42b by a predetermined amount, and drives the actuators 45a and 45b to drive the light projection unit 44a and the light receiving unit 44b. The optical axes of are matched. By reducing the angle between the arms 42a and 42b, the living body surface sandwiched between the tips of the arms 42a and 42b is raised.

  Next, in step S23, the control unit 41 determines whether or not the angle between the arms 42a and 42b is a preset minimum value. If it is determined that the value is the minimum value (in the case of YES), the process proceeds to step S27. If it is determined that the value is not the minimum value (in the case of NO), the process proceeds to step S24.

  In step S24, the control unit 51 acquires the output (light reception amount) of the light receiving unit 45b. In this case, the control unit 51 monitors the output of the light receiving unit 45b for a predetermined time. In step S25, the control unit 51 determines whether there is a large pulsation in the output of the light receiving unit 45b. When it is determined that there is a large pulsation in the output of the light receiving unit 45b (in the case of YES), it is considered that light passes through the subcutaneous tissue. In this case, the process proceeds from step S25 to step S27. On the other hand, when it is determined that there is no pulsation or the pulsation is sufficiently small (in the case of NO), the process proceeds from step S25 to step S26.

  In step S26, the control unit 51 determines whether or not the output (light reception amount) of the light receiving unit is sufficient. When it determines with it being sufficient, it transfers to step S22, and the control part 51 drives the angle adjustment part 43, further reduces the angle between arms 42a and 42b by predetermined amount, Then, it repeats said process. On the other hand, if it is determined in step S26 that the amount of light is not sufficient, the process proceeds to step S27.

  In step S27, the control unit 51 drives the angle adjustment unit 43 to widen the angle between the arms 42a and 42b by a predetermined amount, and drives the actuators 46a and 46b to change the optical axes of the light projection unit 44a and the light receiving unit 44b. Match. In step S28, the amount of received light is acquired from the light receiving unit 44b, and the biological component is calculated in step S29.

  Also in this embodiment, the same effect as that of the first embodiment can be obtained. In the present embodiment, the actuators 45a and 45b are driven each time the angle between the arms 42a and 42b is changed, so that the optical axes of the light projection unit 44a and the light receiving unit 44b are matched. Thereby, it is possible to always measure biological components in blood with good accuracy regardless of the measurement site.

  In the noninvasive living body component measuring apparatus according to the first and second embodiments, an actuator that moves at least one of the light projection unit and the light receiving unit is provided so that the optical axes of the light projection unit and the light receiving unit coincide with each other. May be.

  Regarding the above embodiment, the following additional notes are disclosed.

(Appendix 1) an inspection head in contact with the surface of a living body;
A control unit for measuring a biological component based on a signal output from the inspection head,
The inspection head is
A first sandwiching portion and a second sandwiching portion that are raised across the living body surface;
A distance adjusting unit that is controlled by the control unit to change a distance between the first sandwiching unit and the second sandwiching unit;
A light projection unit for projecting light onto a living body surface of a raised portion sandwiched between the first sandwiching portion and the second sandwiching portion;
A biological component measuring apparatus comprising: a light receiving unit that outputs a signal corresponding to the amount of light transmitted through the living body surface of the raised portion.

  (Additional remark 2) The said control part controls the said 1st clamping part and the said 2nd until the magnitude | size of the pulsation component contained in the signal output from the said light-receiving part reaches the setting value by controlling the said distance adjustment part. When the magnitude of the pulsating component reaches the set value, the distance between the first sandwiching part and the second sandwiching part is increased by a predetermined amount, and the output of the light receiving part is increased. The biological component measuring apparatus according to appendix 1, wherein the biological component is obtained using the output of the light receiving unit at this time.

  (Additional remark 3) The said control part memorize | stores the output of the said light-receiving part before pinching | interposing the said biological body surface between the said 1st clamping part and the said 2nd clamping part, and this memory | storage is calculated when calculating the said biological component. The biological component measuring apparatus according to appendix 2, wherein the output of the received light receiving unit is also used.

(Appendix 4) The inspection head is provided with a groove,
The biological component measuring apparatus according to any one of supplementary notes 1 to 3, wherein the first sandwiching portion and the second sandwiching portion are disposed with the groove interposed therebetween.

  (Supplementary Note 5) Any one of Supplementary Notes 1 to 3, wherein the inspection head is formed in a “C” shape, and the distance adjusting unit is a piezoelectric element disposed on a peripheral surface of the inspection head. The biological component measuring apparatus according to item 1.

(Appendix 6) The inspection head is arranged at the first arm and the second arm, and at the end of the first arm and the second arm, and is capable of rotating the first arm and the second arm. And a connection part to be connected to
The light projection unit is disposed at the end of the first arm opposite to the connection unit, and the light receiving unit is disposed at the end of the second arm opposite to the connection unit. 4. The biological component measuring apparatus according to any one of appendices 1 to 3, which is characterized by the following.

  (Supplementary Note 7) The inspection head further includes an actuator that moves at least one of the light projection unit and the light receiving unit so that the optical axis of the light projection unit and the optical axis of the light receiving unit coincide with each other. 4. The biological component measuring apparatus according to any one of appendices 1 to 3, which is characterized by the following.

(Appendix 8) A part of the surface of the living body is raised between the first sandwiching portion and the second sandwiching portion,
While projecting light on the raised part of the living body surface, the light receiving part receives light transmitted through the raised part of the living body surface,
Reducing the distance between the first sandwiching portion and the second sandwiching portion until the pulsation component included in the output of the light receiving portion reaches a set value;
When the pulsating component reaches the set value, the distance between the first sandwiching portion and the second sandwiching portion is widened by a predetermined amount to obtain the output of the light receiving unit,
A biological component measurement method comprising calculating a biological component from an output of the light receiving unit.

  (Additional remark 9) The output of the said light-receiving part before pinching | interposing the said biological body surface between the said 1st clamping part and the said 2nd clamping part is memorize | stored, and permeate | transmits the output of this memorize | stored light-receiving part and the said protruding biological body surface The biological component measuring apparatus according to appendix 8, wherein the biological component is calculated using an output of the light receiving unit when the received light is received.

  DESCRIPTION OF SYMBOLS 11, 31, 41 ... Inspection head, 12 ... Groove, 13a, 13b ... Press member, 14, 32 ... Piezoelectric element, 15a, 15b ... Groove, 16a, 16b ... Light source, 17 ... Projection lens, 18a, 18b ... Light receiving lens , 19a, 19b ... light receiving element, 21, 51 ... control unit, 31a, 31b ... end face, 33a, 44a ... light projection unit, 33b, 44b ... light receiving unit, 42a, 42b ... arm, 43 ... angle adjustment unit, 45a, 45b ... Actuator.

Claims (5)

An inspection head that contacts the surface of the living body;
A control unit for measuring a biological component based on a signal output from the inspection head,
The inspection head is
A first sandwiching portion and a second sandwiching portion that are raised across the living body surface;
A distance adjusting unit that is controlled by the control unit to change a distance between the first sandwiching unit and the second sandwiching unit;
A light projection unit for projecting light onto a living body surface of a raised portion sandwiched between the first sandwiching portion and the second sandwiching portion;
A biological component measuring apparatus comprising: a light receiving unit that outputs a signal corresponding to the amount of light transmitted through the living body surface of the raised portion.   The control unit controls the distance adjusting unit and the magnitude of the pulsation component included in the signal output from the light receiving unit reaches a set value, between the first and second clamping units. When the magnitude of the pulsating component reaches the set value, the distance between the first sandwiching portion and the second sandwiching portion is increased by a predetermined amount, and the output of the light receiving unit is acquired. The biological component measuring apparatus according to claim 1, wherein the biological component is calculated using the output of the light receiving unit.   The control unit stores the output of the light receiving unit before the biological surface is sandwiched between the first sandwiching unit and the second sandwiching unit, and calculates the biological component of the stored light receiving unit. The biological component measuring apparatus according to claim 2, wherein an output is also used. The inspection head is provided with a groove,
4. The biological component measuring apparatus according to claim 1, wherein the first sandwiching portion and the second sandwiching portion are disposed with the groove interposed therebetween. 5. A part of the surface of the living body is raised between the first sandwiching portion and the second sandwiching portion;
While projecting light on the raised part of the living body surface, the light receiving part receives light transmitted through the raised part of the living body surface,
Reducing the distance between the first sandwiching portion and the second sandwiching portion until the pulsation component included in the output of the light receiving portion reaches a set value;
When the pulsating component reaches the set value, the distance between the first sandwiching portion and the second sandwiching portion is widened by a predetermined amount to obtain the output of the light receiving unit,
A biological component measurement method comprising calculating a biological component from an output of the light receiving unit.

Images