JP4493326B2 - Puncture mechanism, puncture device and component measuring device - Google Patents

Description

  The present invention relates to a puncture mechanism, a puncture device, and a component measurement device applied to, for example, a blood glucose measurement device.

  In recent years, with the increase in the number of diabetic patients, self blood glucose measurement in which patients themselves monitor fluctuations in daily blood glucose levels has been recommended. For the measurement of the blood glucose level, a blood glucose measuring device that simply measures the amount of glucose in the blood is used. Prior to this measurement, the patient needs to collect his blood. As a method for collecting blood, after puncturing the skin of a fingertip with a puncture needle, the blood is squeezed by pressing the periphery of the puncture portion with a finger or the like.

  The squeezed blood is spotted on a test paper or an electrode chip, and the color development or current value of the dye produced by the enzyme reaction is measured and converted into a blood glucose level. The present applicant has developed a chip in which a chip with a puncture needle and a sensor chip are integrated with the aim of easy handling (Japanese Patent Application Nos. 2003-018147 and 2003-124847).

  When puncturing a fingertip with a puncture needle, a tip with a puncture needle is attached to the puncture device, and the puncture device is caused to protrude by operating the puncture device to puncture the finger pad (for example, see Patent Document 1). In this case, it is necessary to puncture the puncture needle to an appropriate depth. This is because if the depth of puncture from the skin surface is too shallow, blood does not come out, and conversely if too deep, pain increases.

  However, with conventional devices, the puncture depth may not be appropriate. For example, if the skin of the finger pad is soft, the skin swells toward the puncture needle, so that the puncture needle is too deep, or conversely, if the skin of the finger pad is hard, the skin swells. Since there are few, there may be a case where the puncture depth becomes shallow.

JP 2000-245717 A

  An object of the present invention is to provide a puncture mechanism, a puncture device, and a component measuring device capable of obtaining an appropriate puncture depth regardless of conditions such as hardness and softness of the living body surface of the puncture site.

Such an object is achieved by the present invention of the following (1) to ( 11 ).
(1) A puncture mechanism that punctures a living body surface with a puncture needle to collect a body fluid,
An abutting portion having an end portion that abuts on the surface of the living body;
A puncture needle push-out mechanism for projecting the attached puncture needle and puncturing the living body surface;
A detection end that contacts the surface of the living body is provided, and the detection end is pressed against the surface of the living body so as to be displaced with respect to a reference plane defined by the end of the contact portion. A displacement member;
A displacement amount detecting means for detecting a displacement amount of the displacement member;
A puncture mechanism comprising: a protrusion length adjusting mechanism that adjusts a protrusion length of the puncture needle based on the detected displacement amount.

  (2) The puncture mechanism according to (1), further including a control unit that sets the protrusion length in order to adjust the protrusion length of the puncture needle based on the displacement amount.

  (3) The puncture mechanism according to (1) or (2), wherein the displacement member has a rod shape, and one end surface thereof constitutes the detection end portion.

  (4) The puncture mechanism according to any one of (1) to (3), wherein the contact portion is configured by a convex line.

(5) having a pressure detection means for detecting a pressing pressure of the surface of the living body against the contact portion;
The puncture mechanism according to any one of (1) to (4), wherein the control means sets a protruding length of the puncture needle based on the detected displacement amount and the pressing pressure.

  (6) The puncture mechanism according to (5), wherein the contact portion is formed of a ridge, and the pressure detection unit is provided integrally with the ridge.

(7) The puncture needle push-out mechanism includes a push rod that pushes out the puncture needle, and a biasing member that biases the push rod in a direction of pushing out,
The protrusion length adjusting mechanism has a stopper that is displaceably placed in contact with a locking portion provided on the push rod and restricts the amount of movement of the push rod, and the displacement of the stopper causes the puncture needle to move. The puncture mechanism according to any one of (1) to (6), wherein the protrusion length is adjusted.

  (8) The stopper is installed to be movable or rotatable in a plane perpendicular to the moving direction of the push rod, and the thickness thereof is different so that the moving amount of the push rod is changed by moving or rotating. The puncture mechanism according to (7), which has a portion.

(9) The stopper is configured by a disk-shaped member that is rotatably installed and has a plurality of teeth on the outer peripheral portion,
The puncture mechanism according to (7) or (8), wherein the protrusion length adjusting mechanism has a pinion gear that meshes with the teeth of the stopper and rotates the teeth.

(10) A puncture device comprising the puncture mechanism according to any one of (1) to (9 ) above .

(11) A component measuring apparatus comprising the puncture mechanism according to any one of (1) to (9) and having a function of measuring the amount and / or property of a predetermined component in the collected body fluid .

  According to the present invention, an appropriate puncture depth can be obtained regardless of conditions such as the hardness and softness of the living body surface of the puncture site. Therefore, it is possible to reliably prevent the puncture depth from the surface of the living body from being too shallow so that the body fluid does not come out, or vice versa.

  Hereinafter, a puncture mechanism, a puncture device, and a component measurement device of the present invention will be described in detail based on preferred embodiments shown in the accompanying drawings.

<First Embodiment>
FIG. 1 is a perspective view showing an embodiment when the component measuring device of the present invention is applied to a blood glucose measuring device, and FIG. 2 is a block diagram of the blood glucose measuring device shown in FIG.

  A blood glucose measurement device 1 shown in FIG. 1 includes a puncture mechanism 3 according to the present invention, and the puncture mechanism 3 allows a surface of a living body (hereinafter, represented by a finger pad F of a hand) to be a tip with a puncture needle (hereinafter simply referred to as “chip”). This is a device that punctures with the puncture needle 101 in 100 to give blood and measures blood sugar in the blood.

  As shown in FIG. 1, the blood glucose measurement device 1 has an elongated body 11. On the side surface of the body 11, a display unit 13 made of, for example, a liquid crystal display element (LCD) is installed. On the display unit 13, for example, power on / off, power supply voltage (remaining battery power), measurement value, measurement date / time, error display, operation guidance, and the like can be displayed. An operation unit (switch) 14 is provided on the side surface of the body 11. The puncture mechanism 3 is configured to operate by pressing the operation unit 14.

  When using the blood glucose measurement device 1, a chip (body fluid collecting tool) 100 is inserted and attached to the opening 12 formed at the tip of the body 11.

  The chip 100 includes a housing (not shown) having a pair of plate-like guides 102 at the tip, a puncture needle 101 housed in the housing, and a test paper (membrane) 103 as a sensor for detecting blood sugar. Have.

  The test paper 103 can detect glucose in blood, and is formed by supporting a coloring reagent on a carrier (absorber) capable of absorbing blood. This carrier is preferably composed of a porous membrane. In this case, the porous membrane preferably has a pore size that can filter out red blood cells in blood.

  When the chip 100 is attached to the blood glucose measurement device 1, the pair of guides 102 is exposed from the opening 12, and the finger pad F is applied to the tip of the guide 102. When the operation unit 14 is pressed in this state, the puncture mechanism 101 is projected from between the pair of guides 102 by the drive of the puncture mechanism 3, and the finger pad F is punctured. The blood that has come out from the puncture hole flows in from the inlet formed in the chip 100 and is supplied onto the test paper 103. Details of the puncture mechanism 3 will be described later.

  As shown in FIG. 2, the blood glucose measurement device 1 has, as an electric circuit configuration, a control unit (control means) 40 configured by, for example, a microcomputer, and an oscillation that oscillates a clock signal that takes operation timing of the control unit 40. Unit 41, a power supply unit 42 configured by a battery, a power supply voltage detection unit 43, a data storage unit 44, a measurement unit 45, a temperature detection unit 46, a clock unit 47, and a buzzer output unit 48. is doing.

  The control unit 40 controls, for example, whether or not blood has been collected and various operations of the blood glucose measurement device 1. In addition, the control unit 40 includes a calculation unit that calculates the amount of glucose (blood glucose level) in the blood based on a signal from the measurement unit 45.

  The measuring unit 45 optically detects that blood is supplied (collected) to the test paper 103 and optically measures the amount of glucose in the blood developed on the test paper 103. The measuring unit 45 includes a light emitting element (light emitting diode) and a light receiving element (photodiode), irradiates the test paper 103 with light emitted from the light emitting element, receives the reflected light by the light receiving element, and performs photoelectric conversion. The output signal of the light receiving element is amplified and A / D converted and input to the control unit 40.

  Based on the input signal, the control unit 40 determines whether or not blood has been collected, that is, whether or not blood has been spread on the test paper 103. Further, the control unit 40 performs predetermined calculation processing based on the input signal, performs correction calculation based on the temperature detected by the temperature detection unit 46, and the amount of glucose (blood glucose level) in the blood. Ask. The obtained blood glucose level is displayed on the display unit 13.

  In the present invention, the component measurement method is not limited to the above-described method of optically measuring the test paper 103 as a sensor, and any measurement method may be used. For example, an electrode is used as the sensor. An electrical measurement method may be used.

  FIG. 3 is a cross-sectional view schematically showing the first embodiment of the puncture mechanism of the present invention, and FIGS. 4 and 5 are cross-sections each showing a state in which the finger pad is applied to the reference surface of the puncture mechanism shown in FIG. FIG. Hereinafter, based on these drawings, the configuration of the puncture mechanism 3 included in the blood glucose measurement device 1 will be described. In the following description, the upper side in FIG. 3 is referred to as “tip” and the lower side is referred to as “base end”.

  The puncture mechanism 3 shown in FIG. 3 includes a contact portion 31 having an end 311 that can contact the finger pad F, a puncture needle push-out mechanism 32, a displacement member 33, and a displacement amount for detecting the displacement amount of the displacement member 33. A detection means (detection unit) 34 and a protrusion length adjusting mechanism 35 that adjusts the protrusion length of the puncture needle 101 are provided.

  Here, the displacement member 33 and the displacement amount detection means 34 have a function as a biological surface detection means for detecting the state of the rising portion of the biological surface. Further, the protruding length means the length of the needle tip portion protruding toward the tip side with respect to the reference surface S.

  As shown in FIGS. 1 and 3, the abutting portion 31 is constituted by a ridge installed at the tip of the body 11, and the top surface of the ridge constitutes an end 311. The height of the end portion 311 is substantially the same as the end surface of the guide 102 of the chip 100, and the finger pad F abuts both the end portion 311 and the guide 102 (FIG. 1). In the configuration of FIG. 1, the contact portion 31 is U-shaped, but is not limited to such a shape, and may be a semicircular shape. Further, the end portion 311 of the contact portion 31 may be wide and form a surface, may be narrow, and may be linear. The reference surface S is defined by the end 311 of the contact portion 31. As shown in FIG. 3, the reference surface S refers to a surface extending from the end 311 in space.

  The puncture needle push-out mechanism 32 includes a holding portion 321 that holds the proximal end portion of the hub 104 fixed to the proximal end side of the puncture needle 101, a push rod 322 that is connected to the holding portion 321 and the puncture needle 101 that pushes the push rod. And a coil spring 323 as an urging member that urges in a direction (front end direction) to be pushed out through 322. Although not shown, it is preferable to have a return spring for pulling back the needle tip of the puncture needle 101 protruding by the puncture operation.

  In the state of FIG. 3, the coil spring 323 is in a compressed state and stores a force for causing the puncture needle 101 to protrude, and movement of the push rod 322 in the distal direction is restricted by a restriction member (not shown). Yes. When the operation unit 14 is operated, this restriction is released, the coil spring 323 extends, the puncture needle 101 protrudes, and the finger pad F is punctured.

  The displacement member 33 is a rod-like member disposed substantially parallel to the puncture needle 101 and is provided so as to be displaced with respect to the reference plane S. The detection end 331 at the tip of the displacement member 33 is in contact with the finger pad F. The displacement member 33 is installed so as to be movable in the longitudinal direction thereof, and is movable from a state where the detection end 331 protrudes from the reference plane S to a state where the detection end 331 is retracted from the reference plane S. .

  In the illustrated configuration, the detection end 331 at the tip of the displacement member 33 is represented as a plane parallel to the reference plane S, but is not limited thereto, and may be a slope shape or a protrusion shape. .

  In the illustrated configuration, the displacement member 33 is disposed in the vicinity of the inside of the contact portion 31. In addition, a coil spring 332 as an urging member that urges the displacement member 33 in a direction to return to the original position (distal direction) when the displacement member 33 is retracted is installed on the proximal end side.

  When the detection end 331 is pressed against the finger pad F, the displacement member 33 moves so as to retract, and when the finger pad F is released, the coil spring 332 extends to return to the original position.

  The displacement amount detection means 34 detects the displacement amount of the displacement member 33, and the detection result is input to the control unit 40. The displacement amount detection means 34 may be of any configuration, for example, it can be detected using a variable resistor or optically detected.

  Further, the living body surface detecting means for detecting the state of the rising portion of the living body surface is not limited to the case where the displacement member 33 and the displacement amount detecting means 34 are used, but electromagnetic waves (light, radio waves, etc.) directly on the living body surface. It is also possible to measure the position and shape of the living body surface and the amount of displacement by measuring the amount of reflection by irradiating a sound wave, sound wave, ultrasonic wave or the like.

As shown in FIG. 4, when the skin of the finger pad F is soft or when the finger pad F is strongly pressed against the end 311, the finger pad F greatly exceeds the reference plane S toward the puncture needle 101. It gets excited. In other words, the raised portion F ₁ of the finger pad F is increased. In this state, the displacement amount of the displacement member 33 is large.

On the other hand, as shown in FIG. 5, when the skin of the finger pad F is hard, or when the finger pad F is only lightly applied to the end portion 311, the finger pad F does not rise so much, and the raised part F ₁ is small. In this state, the displacement amount of the displacement member 33 is small.

In this manner, by detecting the displacement amount of the displacement member 33 by the displacement amount detecting means 34 can detect the state of the raised portion F ₁ which raised the needle 101 side of the finger pad F.

  As shown in FIG. 3, the protrusion length adjusting mechanism 35 includes a disk-shaped (ring-shaped) rotation stopper 351 that is rotatably installed, a locking portion 352 that is fixed in the middle of the push rod 322, and a rotation stopper 351. And a pinion gear 353 that meshes with a plurality of teeth formed on the outer peripheral portion, and an operating portion 354 that rotationally drives the pinion gear 353.

  When the push rod 322 is pushed out by the urging force of the coil spring 323, the push rod 322 moves until the locking portion 352 contacts the rotation stopper 351. Thereby, the movement amount of the push rod 322 is limited, and the protruding length of the puncture needle 101 is also limited.

  The rotation stopper 351 has a shape that is thick on the left side in FIG. 3 and thins toward the right side in FIG. Therefore, when the operation portion 354 is operated to rotate the rotation stopper 351, the thickness of the rotation stopper 351 at the portion where the locking portion 352 abuts changes, and the amount of movement of the push rod 322 changes. In this way, the protrusion length adjustment mechanism 35 can adjust (change) the protrusion length of the puncture needle 101.

  The stopper is not limited to the rotation stopper 351 as described above, and may be one that moves linearly in a plane perpendicular to the moving direction of the push rod 322. For example, a plate-like stopper having teeth (rack) meshing with the pinion gear at one edge can be used. Further, the stopper is not limited to one whose thickness changes continuously, and may be one that changes stepwise.

  The control unit 40 sets the protruding length of the puncture needle 101 based on the displacement amount of the displacement member 33 detected by the displacement amount detection means 34. FIG. 6 is a graph showing the relationship between the distance D between the reference plane S and the detection end 331 and the set value of the protruding length of the puncture needle 101 at this time. The sign of the distance D is positive when the detection end 331 is in the base end side (puncture needle 101 side) with respect to the reference plane S as shown in FIG. Further, the protruding length of the puncture needle 101 refers to the protruding length of the tip of the puncture needle 101 with respect to the reference plane S.

  As shown in FIG. 6, the control unit 40 sets the protrusion length of the puncture needle 101 to be smaller as the distance D is larger. Next, the control unit 40 operates the operation unit 354 based on the set protrusion length, and rotates the rotation stopper 351. Thereby, it will be in the state which implement | achieves the set protrusion length. That is, when the operation unit 14 is operated in this state, the puncture needle 101 protrudes by the set protrusion length.

By performing the control as described above, when a large raised portion F ₁ of the finger pad F as shown in FIG. 4, the protruding length of the needle 101 decreases, raised portions of the finger pad F as shown in FIG. 5 If F ₁ is small, the projecting length of needle 101 is increased. Therefore, in any case, since the puncture depth from the surface of the finger pad F when the puncture needle 101 is punctured to the tip of the puncture needle 101 is substantially constant, the puncture depth is too shallow and blood does not come out. On the other hand, it is possible to reliably prevent the puncture depth from being too deep and causing severe pain.

  In the example shown in FIG. 6, the protrusion length of the puncture needle 101 is gradually changed according to the change in the distance D. However, the relationship is not limited to this, and as shown in FIG. It is good also as the relationship which changes the protrusion length of the puncture needle 101 in steps according to a change.

  Moreover, in this invention, the mechanism which can adjust the protrusion length of the puncture needle 101 by manual operation according to a patient's individual case and liking may be provided. In that case, the control unit 40 may set the protrusion length of the puncture needle 101 by correcting the protrusion length adjusted by manual operation based on the detected distance D. For example, the protrusion length may be set by increasing / decreasing the manual setting value by the amount corresponding to the correction protrusion length determined by the graph shown in FIG.

<Second Embodiment>
FIG. 9 is a cross-sectional view schematically showing a second embodiment of the puncture mechanism of the present invention, FIG. 10 is a block diagram of a blood glucose measuring device provided with the puncture mechanism shown in FIG. 9, and FIG. 6 is a graph showing the relationship between the pressing pressure and the corrected protrusion length of the puncture needle 101.

  Hereinafter, the second embodiment of the present invention will be described with reference to these drawings. However, the difference from the first embodiment will be mainly described, and the description of the same matters will be omitted.

  As shown in FIG. 9, the puncture mechanism 3 ′ of the present embodiment has a pressure sensor (pressure detection means) 36 that detects the pressing pressure of the finger pad F against the contact portion 31 (end portion 311). . In the illustrated configuration, the pressure sensor 36 is integrally embedded in the root portion of the ridge constituting the abutting portion 31, whereby pressure can be detected with high accuracy and the structure can be simplified. I can plan.

  As shown in FIG. 10, the detection signal of the pressure sensor 36 is input to the control unit 40 via the pressure detection unit 37. The control unit 40 calculates the corrected protrusion length based on the relationship shown in FIG. 11 according to the input pressure value of the finger pad F. At this time, when the pressing pressure is small, the correction protrusion length is a negative value, and as the pressing pressure increases, the correction protrusion length approaches zero and further becomes a positive value.

  The control unit 40 increases or decreases the setting value of the protrusion length of the puncture needle 101 obtained based on the relationship of FIG. 6 or FIG. 7 by the correction protrusion length obtained based on FIG. Set. That is, when the pressing pressure of the finger pad F is small, the protrusion length of the puncture needle 101 is corrected to be smaller than that in the first embodiment, and conversely, when the pressing pressure of the finger pad F is large Then, the protruding length of the puncture needle 101 is corrected so as to be larger than that in the first embodiment.

By performing the correction as described above, there are the following advantages. Also a climax how the climax part F ₁ of the finger pad F is the same, the skin is pressure weakens the pressing is a soft person, the pressing pressure is strong in hard human skin. If the skin is soft, the skin is thin, and by performing correction to reduce the protruding length of the puncture needle 101 as described above, the puncture depth becomes too deep and it is possible to more reliably cause severe pain. Can be prevented. On the other hand, if the skin is hard, the skin is thick, so that the puncture depth is too shallow so that blood does not come out by performing correction to increase the protrusion length of the puncture needle 101 as described above. Can be prevented more reliably.

<Third Embodiment>
FIG. 12 is a perspective view showing an embodiment of the puncture device of the present invention.

  The puncture device 2 shown in FIG. 12 includes a puncture mechanism similar to the puncture mechanism 3 or 3 'described above, and does not have a function of measuring blood sugar, and is a puncture device. The contact portion 31 in the puncture device 2 is formed of a circular ridge, and a displacement member 33 is disposed in the vicinity of the inside thereof. The patient punctures the finger pad F using the puncture device 2 to give blood, and then measures the blood glucose level in the blood using a separate blood glucose meter.

  Like the puncture device 2, the puncture mechanism of the present invention can also be applied to a device dedicated to puncture.

  The puncture mechanism, the puncture device, and the component measuring device of the present invention have been described above with respect to the illustrated embodiment. However, the present invention is not limited to this, and the components constituting the puncture mechanism, the puncture device, and the component measuring device are not limited thereto. Can be replaced with any structure capable of performing the same function. Moreover, arbitrary components may be added.

  In the present invention, the puncture site is not limited to the finger pad, but may be any site on the surface of the living body. For example, the site can be used for the palm, arm, thigh, abdomen, earlobe and the like. In addition, the biological component measured by the component measuring device is not limited to glucose, and may be any component.

It is a perspective view showing an embodiment at the time of applying a component measuring device of the present invention to a blood glucose measuring device. It is a block diagram of the blood glucose measuring device shown in FIG. It is sectional drawing which shows typically 1st Embodiment of the puncture mechanism of this invention. It is sectional drawing which shows the state which applied the finger pad to the reference plane of the puncture mechanism shown in FIG. It is sectional drawing which shows the state which applied the finger pad to the reference plane of the puncture mechanism shown in FIG. It is a graph which shows the relationship between the distance between a reference plane and a detection edge part, and the setting value of the protrusion length of a puncture needle. It is a graph which shows the relationship between the distance between a reference plane and a detection edge part, and the setting value of the protrusion length of a puncture needle. It is a graph which shows the relationship between the distance between a reference plane and a detection edge part, and correction | amendment protrusion length. It is sectional drawing which shows typically 2nd Embodiment of the puncture mechanism of this invention. FIG. 10 is a block diagram of a blood glucose measurement device provided with the puncture mechanism shown in FIG. 9. It is a graph which shows the relationship between the pressing pressure of a finger pad and the correction | amendment protrusion length of a puncture needle. It is a perspective view which shows embodiment of the puncture apparatus of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Blood glucose measuring apparatus 11 Body 12 Opening part 13 Display part 14 Operation part 2 Puncture apparatus 3 Puncture mechanism 31 Contact part 311 End part 32 Puncture needle pushing mechanism 321 Holding part 322 Push rod 323 Coil spring 33 Displacement member 331 Detection end part 332 Coil spring 34 Displacement detection means (detection unit)
35 Projection length adjusting mechanism 351 Rotation stopper 352 Locking portion 353 Pinion gear 354 Actuating portion 36 Pressure sensor 37 Pressure detecting portion 40 Control portion 41 Oscillating portion 42 Power source portion 43 Power source voltage detecting portion 44 Data storage portion 45 Measuring portion 46 Temperature detecting portion 47 Clock part 48 Buzzer output part 100 Tip 101 Puncture needle 102 Guide 103 Test paper 104 Hub F Finger pad F ₁ Swelling part S Reference plane

Claims (11)

A puncture mechanism for puncturing a puncture needle on the surface of a living body to collect body fluid,
An abutting portion having an end portion that abuts on the surface of the living body;
A puncture needle push-out mechanism for projecting the attached puncture needle and puncturing the living body surface;
A detection end that contacts the surface of the living body is provided, and the detection end is pressed against the surface of the living body so as to be displaced with respect to a reference plane defined by the end of the contact portion. A displacement member;
A displacement amount detecting means for detecting a displacement amount of the displacement member;
A puncture mechanism comprising: a protrusion length adjusting mechanism that adjusts a protrusion length of the puncture needle based on the detected displacement amount.   The puncture mechanism according to claim 1, further comprising a control unit that sets the projection length in order to adjust the projection length of the puncture needle based on the amount of displacement.   The puncture mechanism according to claim 1 or 2, wherein the displacement member has a rod shape, and one end surface thereof constitutes the detection end portion.   The puncture mechanism according to any one of claims 1 to 3, wherein the contact portion is formed of a convex line. Pressure detecting means for detecting the pressing pressure of the living body surface to the contact portion;
The puncture mechanism according to any one of claims 1 to 4, wherein the control means sets a protruding length of the puncture needle based on the detected displacement amount and the pressing pressure.   The puncture mechanism according to claim 5, wherein the abutting portion is configured by a ridge, and the pressure detection unit is provided integrally with the ridge. The puncture needle push-out mechanism has a push rod that pushes out the puncture needle, and a biasing member that biases the push rod in a direction of pushing out,
The protrusion length adjusting mechanism has a stopper that is displaceably placed in contact with a locking portion provided on the push rod and restricts the amount of movement of the push rod, and the displacement of the stopper causes the puncture needle to move. The puncture mechanism according to any one of claims 1 to 6, wherein the protrusion length is adjusted.   The stopper is disposed so as to be movable or rotatable in a plane perpendicular to the moving direction of the push rod, and has a portion having a different thickness so that the amount of movement of the push rod is changed by moving or rotating. The puncture mechanism according to claim 7. The stopper is rotatably configured, and is composed of a disk-shaped member having a plurality of teeth on the outer peripheral portion,
The puncture mechanism according to claim 7 or 8, wherein the protrusion length adjusting mechanism has a pinion gear that meshes with the teeth of the stopper and rotates the teeth. A puncture apparatus comprising the puncture mechanism according to any one of claims 1 to 9 . A component measuring apparatus comprising the puncture mechanism according to any one of claims 1 to 9 and having a function of measuring an amount and / or property of a predetermined component in a collected body fluid.

Images