JP5902992B2 - Puncture device - Google Patents

Description

  The present invention relates to a puncture 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. The blood glucose level is measured by using a blood glucose measuring device that measures the amount of glucose in the blood. Prior to this measurement, the patient needs to collect his blood.

  As a method of 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 fingertip puncture includes a puncture needle tip having a puncture needle and a casing for housing the puncture needle, a mounting portion to which the puncture needle tip is detachably mounted, and a plunger that is connected to the puncture needle in the mounted state. A puncture device set (see, for example, Patent Document 1) configured with a puncture device is used.

  Specifically, first, the puncture needle tip with the cap attached is grasped with the finger of one hand, the puncture device is grasped with the finger of the other hand, and the puncture needle tip is inserted into the puncture device and attached. Then, the cap is removed from the casing of the puncture needle tip, and then the puncture needle is pushed from the opening of the casing by pressing the puncture button and operating the puncture device in the mounted state, Puncture the fingertip addressed to the part. After use, the puncture needle tip is removed from the puncture device and discarded. In order to prevent reuse of the puncture needle tip, the puncture needle tip that has been once punctured is configured not to be used again.

  However, in the conventional puncture device, when removing the cap covering the opening from the casing of the puncture needle tip, if the cap is pulled out in a direction inclined from the central axis of the casing, the puncture needle tip moves in a direction to be removed from the puncture device. There was a risk of doing so. As a result, when puncturing, there is a risk that the needle tip does not protrude from the tip opening of the puncture needle tip, or that the amount of protrusion decreases and sufficient puncturing cannot be performed. Further, not only when removing the cap, the puncture needle tip once attached may be mistakenly removed before puncture or moved in the direction of removal, and the puncture needle tip is punctured. There is a risk that it will be in a state after it has been moved, or a state in which the needle tip does not protrude, that is, a state where it cannot be used.

  On the other hand, the fitting force with the puncture needle tip can be increased by narrowing the inner diameter of the mounting portion. However, the force required to attach or remove the puncture needle tip increases, which makes it difficult to use. In addition to increasing the fitting force, it is also necessary to balance the load so as not to increase the load. In the conventional configuration, the mounting portion is made of a plastic molded product, and there is a limit to fine adjustment.

International Publication No. 2004/91402 Pamphlet

  An object of the present invention is to provide a puncture device that prevents the casing of a mounted puncture needle tip from moving away from the mounting portion and does not require an excessive force to attach and detach the puncture needle tip. .

Such an object is achieved by the present inventions (1) to (5) below.
(1) A puncture needle having a needle body having a sharp needle tip at a distal end and a needle hub fixed to the proximal end portion of the needle body, and storing the puncture needle movably along the axial direction thereof; A puncture needle tip having an opening through which the needle tip can protrude and a cylindrical casing having three or more convex portions provided along the circumferential direction of the outer peripheral surface is detachably attached to the distal end portion. A puncture device used for
A hollow housing having a mounting portion at a tip portion to which the casing is detachably mounted;
Provided along the circumferential direction inside the mounting portion, and when the casing is mounted on the mounting portion, the three or more convex portions of the casing are elastically deformed by contact with the three or more convex portions. Pressure contact means each having a plurality of pressure contact pieces having different elastic constants,
The puncture apparatus, wherein the pressure contact pieces having different elastic constants are in pressure contact with two of the convex portions in a state where the casing is mounted on the mounting portion.

(2) a puncture needle having a needle body having a sharp needle tip at the tip and a needle hub fixed to the proximal end portion of the needle body, and storing the puncture needle movably along its axial direction; A puncture needle tip having an opening through which the needle tip can protrude and a cylindrical casing having three or more convex portions provided along the circumferential direction of the outer peripheral surface is detachably attached to the distal end portion. A puncture device used for
A hollow housing having a mounting portion at a tip portion to which the casing is detachably mounted;
Provided along the circumferential direction inside the mounting portion, and when the casing is mounted on the mounting portion, the three or more convex portions of the casing are elastically deformed by contact with the three or more convex portions. Pressure contact means each having a plurality of pressure contact pieces having different elastic constants,
When the casing is mounted on the mounting portion, the axis of the casing is inclined by the resultant force of the press contact pieces that press contact with the convex portions regardless of the position of the casing in the rotational direction with respect to the press contact pieces. A puncture apparatus characterized by being configured as described above.

  (3) In the state in which the casing is mounted on the mounting portion, the one having the largest elastic constant among the pressing pieces is configured to be pressed into only one of the convex portions. The puncture device according to (1) or (2).

(4) The elastic constant of each pressure contact piece is set in three or more stages,
The state according to any one of (1) to (3), wherein the pressure contact pieces having different elastic constants are in pressure contact with the convex portions in a state where the casing is mounted on the mounting portion. Puncture device.

(5) The pressure contact means has a cylindrical shape, and includes a pressure contact member into which the casing is inserted when the casing is mounted on the mounting portion.
The pressure contact member is provided with a plurality of first slits extending in the axial direction of the pressure contact member from the proximal end to the middle of the pressure contact member along the circumferential direction of the pressure contact member, and adjacent to the pressure contact member. The puncture device according to any one of (1) to (4), wherein a portion between the first slits constitutes the pressure contact piece.

  In the puncture device according to the present invention, the pressure contact member includes a plurality of second slits extending in the axial direction of the pressure contact member from the front end to the middle of the pressure contact member along the circumferential direction of the pressure contact member. Are preferably provided alternately.

  In the puncture device of the present invention, the pressure contact member includes a large diameter portion provided on the distal end side, a small diameter portion provided on the proximal end side and having an inner diameter smaller than the large diameter portion, and the large diameter portion and the small diameter. It is preferable to have a taper part which is provided between the large diameter part and the inner diameter gradually decreases from the large diameter part side toward the small diameter part side.

In the puncture device of the present invention, the tip of the first slit is located in the large diameter portion or the tapered portion,
It is preferable that the elastic constant of each pressure contact piece is set by setting the length of the tapered portion in the axial direction.

  In the puncture device of the present invention, it is preferable that the elastic constant of each pressure contact piece is set by setting the length or width of the second slit in the axial direction.

  In the puncture device of the present invention, it is preferable that the elastic constant of each pressure contact piece is set by setting the thickness of the pressure contact piece.

  In the puncture device of the present invention, it is preferable that the puncture device has an ejection mechanism that moves the casing in the distal direction with respect to the housing and removes the puncture needle tip from the puncture device.

In the puncture device of the present invention, the puncture needle tip has a cap fitted to the casing so as to cover an opening from which the needle tip can protrude,
It is preferable that the pressure contact force of each pressure contact piece to the casing is larger than the fitting force between the cap and the casing.

  According to the present invention, the pressure contact pieces having different elastic constants of the puncture device are in pressure contact with two of the convex portions of the casing while the casing of the puncture needle tip is mounted on the mounting portion. In this case, the pressure contact force on the convex portion of one pressure contact piece is larger than the pressure contact force on the convex portion of the other pressure contact piece. That is, the other pressure contact piece is elastically deformed more greatly than the one pressure contact piece, whereby the axis of the casing is inclined with respect to the axis on the puncture device side.

  Thereby, it can prevent that the casing of the puncture needle chip | tip with which it was mounted | worn moves to the direction which detaches | leaves from a mounting part unintentionally. This prevents the attached unused puncture needle tip from becoming unusable before use and preventing the needle tip from protruding from the tip opening of the puncture needle tip during use. Can do. At the same time, it is possible to make a fine setting of the pressure contact force so that the force required to attach or remove the puncture needle tip does not become excessive.

In the embodiment of the puncture device set comprised with the puncture apparatus of this invention, and a puncture needle chip | tip, it is a perspective view which shows the state which mounted | wore the puncture apparatus with the puncture needle chip | tip. It is sectional drawing of the puncture needle chip | tip shown in FIG. It is a disassembled perspective view of the puncture device set shown in FIG. It is a disassembled perspective view of the front-end member and collet of the puncture apparatus shown in FIG. It is a rear view of the collet of the puncture device shown in FIG. It is sectional drawing in the AA of the collet shown in FIG. It is sectional drawing which shows the front-end member of the puncture apparatus shown in FIG. 1, a collet, and a case main body. It is sectional drawing in the BB line of the front-end member shown in FIG. 7, and a collet. It is a perspective view which shows the 2nd member and collet of the front-end member of the puncture apparatus in the puncture device set shown in FIG. 1, and the casing of a puncture needle tip. It is sectional drawing which shows the front-end member, collet, case main body, and 2nd connection body of the puncture apparatus shown in FIG. It is sectional drawing which shows the front-end member, collet, case main body, and 2nd connection body of the puncture apparatus in the puncture device set shown in FIG. 1, and the casing of a puncture needle chip | tip. It is sectional drawing in the CC line in FIG. It is sectional drawing for demonstrating an effect | action of the puncture device set shown in FIG. It is sectional drawing for demonstrating an effect | action of the puncture device set shown in FIG. It is sectional drawing for demonstrating an effect | action of the puncture device set shown in FIG. It is a perspective view which shows the other structural example of the collet of the puncture apparatus shown in FIG. It is a perspective view which shows the other structural example of the collet of the puncture apparatus shown in FIG.

Hereinafter, the puncture device of the present invention will be described in detail based on embodiments shown in the accompanying drawings.
FIG. 1 is a perspective view showing a state where a puncture needle tip is mounted on a puncture device in an embodiment of a puncture device set constituted by the puncture device of the present invention and a puncture needle tip. FIG. 2 is a cross-sectional view of the puncture needle tip shown in FIG. FIG. 3 is an exploded perspective view of the puncture device set shown in FIG. FIG. 4 is an exploded perspective view of a front end member and a collet of the puncture device shown in FIG. FIG. 5 is a rear view of the collet of the puncture device shown in FIG. 1, that is, a view seen from the base end side. 6 is a cross-sectional view taken along the line AA of the collet shown in FIG. FIG. 7 is a cross-sectional view showing a front end member, a collet, and a case body of the puncture device shown in FIG. 8 is a cross-sectional view of the front end member and the collet shown in FIG. 7 taken along line BB. FIG. 8 is a perspective view showing a second member and a collet of the front end member of the puncture device in the puncture device set shown in FIG. 1 and a casing of the puncture needle tip. FIG. 10 is a cross-sectional view showing a front end member, a collet, a case body, and a second connector of the puncture device shown in FIG. FIG. 11 is a cross-sectional view showing a front end member, a collet, a case main body and a second connection body of the puncture device in the puncture device set shown in FIG. 1, and a casing of the puncture needle tip. 13 is a cross-sectional view taken along the line CC in FIG. 13-15 is sectional drawing for demonstrating the effect | action of the puncture device set shown in FIG. 16 and 17 are perspective views showing another configuration example of the collet of the puncture device shown in FIG. In FIG. 13, the first member and the second member are illustrated as the front end member.

  In the following description, in each drawing, the axial direction is the X direction, the X1 direction is “front end”, “front end” or front, and the X2 direction is “base end”, “rear end” or “rear”.

  As shown in FIG. 1, the puncture device set 10 includes a puncture needle tip 12 and a puncture device 1 on which the puncture needle tip 12 is detachably attached to the distal end portion. The puncture device 1 is used to puncture the surface of a living body in a wearing state in which the puncture needle chip 12 is worn, that is, in the state shown in FIG.

First, the puncture needle tip 12 will be described.
As shown in FIGS. 2 and 3, the puncture needle tip 12 includes a tip body 13 and a cap 14 that is detachably attached to the tip body 13. The chip body 13 includes a puncture needle 15 that punctures the skin, a sliding ring (movement limiting means) 16 that is engaged with the puncture needle 15, and a cylindrical casing that holds the puncture needle 15 slidably therein. 18.

  The puncture needle 15 has a tip needle (needle body) 20 and a hub (needle hub) 22 that is molded or bonded integrally with the rear portion of the needle 20. The hub 22 has four elastic levers 24 protruding forward, arranged circumferentially at equal angular intervals, a rear cylindrical sliding support portion 26, and a gripped protrusion 28 protruding at the rear end. The outer diameters of the sliding support portion 26 and the sliding ring 16 are substantially the same as the inner diameter of the casing 18 and can slide in the casing 18 in the axial direction.

  The four elastic levers 24 are inserted into the sliding ring 16 and are in contact with the sliding ring 16. The rear end surface of the sliding ring 16 is in contact with a minute step 24 a provided on the hub 22, and is pushed out simultaneously when the puncture needle 15 moves forward. Further, the contact portion of the elastic lever 24 with the sliding ring 16 has no protrusions or steps, and the sliding ring 16 is easily pulled out when the puncture needle 15 is retracted.

  The casing 18 has a cylindrical shape with a reduced diameter portion 32 at the tip, an inner circumferential stepped portion 34 provided at the rear of the reduced diameter portion 32, and three slightly protruding to the inner circumferential surface slightly in the middle. It has a front bulging portion 36, a rear annular bulging portion 40 slightly projecting on the rear inner peripheral surface, and a skirt 41 provided on the middle outer periphery.

  The front bulge portion 36 is a bulge portion that is low enough to allow the sliding ring 16 to get over when the puncture needle 15 advances. For example, about three of the front bulging portions 36 are provided at equal intervals, the rear side is gentle and the front has a relatively steep slope, and the sliding ring 16 is easy to get over from the rear and can get over from the front. Absent. The peripheral surface 30 of the sliding support part 26 is fitted and fixed to the rear annular bulging part 40 with an appropriate strength. This fitting is a so-called press-fit state. By fitting the rear annular bulging portion 40 and the peripheral surface 30, the rear portion of the needle 20 is kept airtight. The fitting between the circumferential surface 30 and the rear annular bulging portion 40 may be configured such that, for example, an appropriate undercut is provided on the circumferential surface 30 and the rear annular bulging portion 40 is fitted into the undercut.

  The reduced diameter portion 32 has a shape in which both the outer peripheral surface and the inner peripheral surface are reduced in diameter toward the tip, and a circular opening 42 is provided at the tip.

  The skirt 41 is an annular body, and protrudes from the outer periphery of the casing 18 and extends to the rear end side in a cross-sectional view (see FIG. 2), and forms a fitting gap portion 41 a between the casing 18 and the skirt 41.

  Further, a plurality of ribs (chip-side ribs) 44 project from the outer peripheral portion of the end portion on the base end side of the casing 18, that is, the outer peripheral portion closer to the base end side than the skirt 41. Each rib 44 extends along the axial direction. The ribs 44 are arranged at equiangular intervals around the central axis of the casing 18 along the circumferential direction of the outer peripheral portion of the casing 18.

  In the present embodiment, the number of ribs 44 is six, and three of them are set to have a height higher than the other three. Further, the ribs 44 having a higher height and the ribs 44 having a lower height are alternately arranged along the circumferential direction of the casing 18. In a state in which the casing 18 is mounted on the mounting portion 150 (described later) of the puncture device 1, the corresponding pressure-contacting piece 58 of the collet 5 (described later) is pressed into contact with the three ribs 44 having a higher height among the ribs 44. . Accordingly, the three ribs 44 having a higher height form a convex portion to which the corresponding pressure contact piece 58 is pressed in a state where the casing 18 is mounted on the mounting portion 150. In addition, the number of the ribs 44 to which the corresponding press contact piece 58 presses in a state where the casing 18 is mounted on the mounting portion 150 is not particularly limited as long as it is three or more.

  As shown in FIG. 2, the cap 14 has a bottomed cylindrical shape, is fitted into the reduced diameter portion 32 of the casing 18, and closes the opening 42. That is, the cap 14 is detachably attached to the reduced diameter portion 32 and hermetically seals the opening 42.

Next, the puncture device 1 to which the puncture needle tip 12 is attached will be described.
As shown in FIG. 3 and FIG. 13 (a), the puncture device 1 is configured based on the case main body 102, a dial portion 104 for setting the puncture depth, a plunger 106 that can advance and retreat in the axial direction, The plunger 106 has a drive coil spring 108 coaxially arranged at the middle stage portion and a return coil spring 110 coaxially arranged at the rear end portion. The case body 102 is hollow and has a cylindrical shape.

  The puncture device 1 further includes a rear end member 112 that rotatably holds the dial portion 104 on the rear end side of the case main body 102 and a puncture disposed in a hole 114 formed in a side portion on the front end side of the case main body 102. A button 116 and a front end member 118 provided at the tip of the case body 102 and elastically holding the puncture button 116 so as to be displaceable inward. The case main body 102, the rear end member 112, and the front end member 118 constitute the main part of the housing of the puncture apparatus 1.

  In addition, the puncture device 1 is installed in the inner cavity of the rear end member 112 so as to be movable forward and backward with respect to the rear end member 112 and in the case main body 102 so as to be movable in the axial direction with respect to the case main body 102. The first connection body 122 connected to the pusher 120 and the second connection body 124 installed in the case main body 102 and the front end member 118 so as to be movable in the axial direction and connected to the first connection body 122. .

  The plunger 106 includes a middle first spring seat 130 that supports one end of the drive coil spring 108, a pair of second spring seats 132 provided at the rear end in an outward hook shape, and a gripped protrusion of the hub 22. 28, an elastic piece 136 extending forward from the upper middle step portion, and a small protrusion 138 provided at a slightly lower rear portion. The gripping bar 134 constitutes a mounting portion to which the puncture needle 15 is detachably mounted.

  On the inner surface on the front end side of the rear end member 112, there are a plurality of stepped portions 139 arranged in the circumferential direction and having different heights in the axial direction (rear end direction). The staircase portion 139 defines the protruding length of the needle 20 from the opening 42 by the small protrusion 138 of the plunger 106 coming into contact with the plunger 106 when the plunger 106 moves vigorously forward during puncturing. That is, the stepped portion 139 moves in the circumferential direction by rotating the dial portion 104, and the protruding length of the needle 20 is adjusted by the height of the stepped portion 139 with which the small protrusion 138 comes into contact, and the puncture depth Can be adjusted.

  The front end surface 112a of the rear end member 112 has a sufficient area for the first spring seat 130 to abut when the plunger 106 moves rearward, and acts as a stopper that restricts the rearward movement of the plunger 106. To do.

  The gripping bar 134 has a cylindrical shape divided into two by a slit, and can be fitted to the gripped protrusion 28 of the hub 22 while being slightly elastically deformed to hold the hub 22 with an appropriate frictional force. The elastic piece 136 has a first protrusion 140 at the upper end of the tip and a second protrusion 142 slightly rearward. The first spring seat 130 is provided with right and left openings 144 through which a part of the first connecting body 122 is inserted. The first spring seat 130 has a cup shape that opens rearward.

  The front end member 118 has a mounting portion 150 on the distal end side to which the casing 18 of the puncture needle tip 12 is detachably mounted. The mounting portion 150 has a cylindrical shape with an outer surface that tapers slightly toward the tip, and slightly protrudes from the case main body 102. A cylindrical collet (pressure contact member) 5 serving as a pressure contact means is installed inside the mounting portion 150. The collet 5 will be described in detail later.

  Further, the front end member 118 is composed of a plurality of members, in the present embodiment, a first member 118a and a second member 118b (see FIG. 4). Thereby, the collet 5 can be easily installed inside the mounting portion 150. In addition, the 1st member 118a and the 2nd member 118b are joined by adhesion | attachment by an adhesive agent, melt | fusion, etc., for example.

  The outer diameter of the front end portion of the mounting portion 150 is set so as to fit just into the fitting gap portion 41 a of the skirt 41 and the inner diameter portion of the tube front end portion 151 at the front end of the case main body 102.

  The thickness of the tube tip 151 at the tip of the case body 102 is moderately thick, and acts as a receiving seat against which the rear end 41b of the skirt 41 abuts. Hereinafter, the cylinder tip 151 is also referred to as a receiving seat 151. A lumen portion of the mounting portion 150 is a mounting hole 153 in which the puncture needle tip 12 is mounted. In the initial state, the holding bar 134 of the plunger 106 is disposed in the mounting hole 153.

  In addition, a plurality of ribs (mounting portion side ribs) 162 are formed to protrude from the inner peripheral portion of the mounting portion 150. Each rib 162 extends along the axial direction. The ribs 162 are arranged at equiangular intervals around the central axis of the mounting portion 150 along the circumferential direction of the inner peripheral portion of the mounting portion 150, that is, along the circumferential direction of the collet 5 described later.

  The number of ribs 162 is not particularly limited as long as it is plural, but is 12 in the present embodiment. In this embodiment, when the casing 18 of the puncture needle tip 12 is inserted into the mounting portion 150, the two ribs 162 of the mounting portion 150 are positioned between the two adjacent ribs 44 of the casing 18, that is, adjacent to each other. Between the two ribs 162, every other rib 44 is positioned. By providing such ribs 162 and 44, movement of the puncture needle tip 12 in the radial direction is restricted, and the puncture needle 15 can be securely attached to the plunger 106. Further, the engagement between the rib 162 and the rib 44 restricts the rotation of the casing 18 relative to the mounting portion 150 about its axis within a predetermined amount.

  A portion of the front end member 118 other than the mounting portion 150 is inserted into the case main body 102, and the holding portion 152 that holds the puncture button 116 and the plunger 106 move to the rear end side by compressing the driving coil spring 108. A trigger stopper 154 that sometimes engages the first protrusion 140 of the plunger 106.

  The first connection body 122 has a cylindrical body at the rear and has two arms 156 at the front. The two arms 156 are inserted through the openings 144 of the plunger 106. The second connection body 124 is a cylindrical body whose upper surface is open, and has an engagement piece 158 that engages with a slit of each arm 156 at the rear end. That is, the first connection body 122 and the second connection body 124 are integrally connected via the engagement piece 158, and the first connection body 122 and the second connection body 124 are integrally formed by pushing the pusher 120. Move to.

  Further, in the middle of the outer peripheral portion of the second connecting body 124 in the axial direction, there are formed three protrusions 159 that are inserted into three grooves (not shown) formed on the inner peripheral portion of the case body 102, etc. The protrusion 159 is configured to move along each groove. Each protrusion 159 is disposed so as to be positioned closer to the base end side than the collet 5 when the second connecting body 124 moves to the most distal end side. These protrusions 159 can prevent the second connection body 124 from rotating about its axis with respect to the case body 102 when the second connection body 124 moves relative to the case body 102.

  In addition, in the attached longitudinal sectional views, for example, FIG. 13A, FIG. 13B, FIG. 13C, etc., the first connection body 122 and the second connection body 124 are only partially depending on the cross-sectional position. Although not shown, it can be easily understood from FIG. 3 that the first connecting body 122 and the second connecting body 124 are integrated with the pusher 120.

  The cylindrical portion behind the first connection body 122 is disposed so as to cover the rear side of the plunger 106, the second connection body 124 is disposed so as to cover the front side of the plunger 106, and the plunger 106 is configured to cover the first connection body. It is possible to advance and retract in the axial direction inside 122 and the second connecting body 124.

  The pusher 120, the first connecting body 122, and the second connecting body 124 move the casing 18 of the puncture needle tip 12 in the distal direction with respect to the front end member 118 to remove the puncture needle tip 12 from the puncture device 1. The main part of is composed. The second connecting body 124 constitutes an ejecting member that presses the proximal end portion of the casing 18 and moves the casing 18 in the distal direction.

  In addition, a plunger 106 having a gripping bar 134 which is installed so as to be movable in the axial direction and to which the puncture needle 15 is detachably attached, and a driving member which is a biasing member that biases the plunger 106 in the distal direction. The puncture needle includes a coil spring 108 and a trigger stopper 154 that engages with the first protrusion 140 that is an engaging portion of the plunger 106 biased in the distal direction by the driving coil spring 108 and prevents the plunger 106 from moving. The main part of the puncture mechanism that moves 15 at least from the firing preparation position to the puncture position is configured.

  The puncture button 116 performs an operation of activating the puncture mechanism and starting a puncture operation. That is, when the puncture button 116 is pressed, the engagement state between the first protrusion 140 of the plunger 106 and the trigger stopper 154 is released, and the puncture operation is started.

Next, the collet 5 will be described.
As shown in FIGS. 3 to 12, a cylindrical collet 5 is installed inside the mounting portion 150 of the front end member 118. The collet 5 is disposed closer to the proximal end than the rib 162 in the axial direction of the mounting portion 150.

  The collet 5 includes a cylindrical base portion 50 and a plurality of pressure contact pieces 58 formed so as to protrude from the base end portion of the base portion 50 in the base end direction. The number of the pressure contact pieces 58 is not particularly limited as long as it is plural, but in this embodiment, the number of the pressure contact pieces 58 is set to six. Further, the six pressure contact pieces 58a, 58b, 58c, 58d, 58e, and 58f are arranged at equiangular intervals along the circumferential direction of the base 50 in this order counterclockwise in FIG. That is, the pressure contact pieces 58 a to 58 f are arranged in parallel along the circumferential direction inside the mounting portion 150. The widths of the pressure contact pieces 58a to 58f are set to be the same.

  In the following description, when the pressure contact pieces 58 are distinguished from each other, “pressure contact piece 58a”, “pressure contact piece 58b”, “pressure contact piece 58c”, “pressure contact piece 58d”, “pressure contact piece 58e”, “pressure contact piece 58f”. When not distinguished, it is referred to as “pressure contact piece 58”.

  Of the six ribs 44 of the casing 18, when the three ribs 44 having the higher height are distinguished from the three ribs 44 having the lower height, they are referred to as “ribs 44 a”. “Rib 44”. In addition, the code | symbol of "44a" is attached | subjected only to FIG. 9 and FIG.

  In the collet 5, when the casing 18 of the puncture needle tip 12 is mounted on the mounting portion 150, when the casing 18 is inserted, the three pressure contact pieces 58 that contact the three ribs 44 a of the casing 18 are elastically deformed, and the casing The 18 ribs 44a are configured to be in pressure contact with each other. The press contact force of the collet 5, that is, each press contact piece 58 to the casing 18, is set to be sufficiently larger than the fitting force between the cap 14 and the casing 18.

  Here, the pressure contact pieces 58a to 58f have different elastic constants. In the present embodiment, the elastic constants of the pressure contact pieces 58a to 58f are set in three stages. In the following, among the three-stage elastic constants, the largest one is called “large”, the smallest one is called “small”, and the middle one is called “medium”.

  First, the elastic constants of the pressure contact pieces 58a to 58f are set to large, medium, small, small, medium, and large, respectively. That is, the large, medium, small, small, medium, and large pressure contact pieces 58 are arranged at equiangular intervals in this order counterclockwise in FIG.

  Thus, regardless of the angle of the casing 18 of the puncture needle tip 12 mounted on the mounting portion 150 around its axis, that is, regardless of the position of the casing 18 in the rotational direction with respect to the pressure contact pieces 58a to 58f, Large, medium, and small pressure contact pieces 58 are in pressure contact with the ribs 44a, respectively.

  Thereby, a large frictional force is generated between the pressure contact piece 58, the small diameter portion 53, and each rib 44a of the casing 18, and the movement of the casing 18 in the front end direction with respect to the front end member 118 can be reliably prevented.

  When the casing 18 is attached to the attachment portion 150, the shaft of the casing 18 is inclined with respect to the axis of the attachment portion 150 due to the resultant force of the pressure contact pieces 58 a to 58 f that are in pressure contact with the ribs 44 a.

  That is, in the state where the casing 18 is mounted on the mounting portion 150, the small pressure contact piece 58 is elastically deformed the largest, the large pressure contact piece 58 is elastically deformed the smallest, and the inner pressure contact piece 58 is in the size between them. Due to elastic deformation, the axis of the casing 18 is inclined with respect to the axis of the mounting portion 150. Thereby, it is possible to prevent the casing 18 of the attached puncture needle tip 12 from moving unintentionally in the direction of detachment from the attachment portion 150.

  Therefore, when removing the cap 14 from the casing 18, even when an excessive force is applied by pulling the cap 14 in a direction inclined from the central axis of the casing 18, the movement of the casing 18 in the front end direction relative to the front end member 118 is prevented. It is possible to prevent the attached puncture needle tip 12 from being in a state where it can not be used before use or from being in a state where the needle tip does not sufficiently protrude from the tip opening.

  In addition, when the pressure contact pieces 58 arranged in the order of “large, medium, small, small, medium, large” are defined as one unit, the unit is not limited to one unit, for example, two units, four units, five units, seven units, etc. Any number of units other than a multiple of may be used.

  Further, one unit is not limited to the order of “large, medium, small, small, medium, large”. For example, “large, medium, small, large, medium, small”, “large, large, medium, medium, Other orders such as “small” may be used.

Further, the number of steps of the elastic constant of the pressure contact piece 58 is not limited to three, but may be two, or may be four or more.
Further, the number of points for supporting the casing 18 is not limited to three, and may be four or more.

  When the casing 18 is supported at three points, only one third of the central angle of the collet 5 is set to the “large” pressure contact piece 58, so that the three ribs can be set in any other manner. “Large” pressure contact piece 58 contacts only one of 44a, and “large” pressure contact piece 58 does not contact the other two, and “medium” or “small” pressure contact piece 58 contacts. That is, in the case of N point (N is an integer of 3 or more) point support, only 1 / N of the central angle of the collet 5 is set to “large”, so that no matter how the others are set, one The “large” pressure contact piece 58 contacts only the rib 44a. Thereby, the axis of the casing 18 can be inclined with respect to the axis of the mounting portion 150. Other than the “large” pressure contact piece 58, for example, the “medium” pressure contact piece 58 may be set, or the “small” pressure contact piece 58 may be set. ”And“ small ”pressure contact piece 58.

  In this embodiment, the elastic constants of the pressure contact pieces 58a to 58f are set by adjusting the length of the second slit 55.

  That is, the length of the second slit 55 is minimum in the case of the “large” pressure contact pieces 58a and 58f, and the length of the second slit 55 is maximum in the case of the “small” pressure contact pieces 58c and 58d. In the case of the “medium” pressure contact pieces 58b and 58e, the length of the second slit 55 is between the maximum and the minimum.

  The collet 5 has the following configuration. As shown in FIGS. 4 to 6, the collet 5 includes a large-diameter portion 51 provided on the distal end side, a small-diameter portion 53 provided on the proximal end side and having a smaller outer diameter and inner diameter than the large-diameter portion 51, A tapered portion 52 is provided between the large-diameter portion 51 and the small-diameter portion 53 and has an outer diameter and an inner diameter that gradually decrease from the large-diameter portion 51 side toward the small-diameter portion 53 side. The rib 18 is pressed against the outer peripheral portion 44 of the casing 18. Note that the thickness of the collet 5 is constant in the present embodiment, but is not limited to this, and may vary in the axial direction, for example.

  Further, the inner diameter of the large diameter portion 51 is set slightly larger than the outer diameter including the three ribs 44 having a higher height among the six ribs 44 of the casing 18, and the inner diameter of the small diameter portion 53 is The height of the casing 18 is set slightly smaller than the outer diameter including the three ribs 44 on the higher side.

  The collet 5 is formed with a plurality of first slits 54 and a plurality of second slits 55. The number of the first slits 54 and the second slits 55 is not particularly limited as long as it is plural, but in the present embodiment, the number of the first slits 54 and the second slits 55 is respectively set to six. Yes. Further, the first slits 54 and the second slits 55 are alternately arranged along the circumferential direction of the collet 5.

  The first slit 54 is a slit extending in the axial direction from the base end of the collet 5 to the middle. That is, the first slit 54 is open to the proximal end side of the collet 5. The first slits 54 are arranged at equiangular intervals around the central axis of the collet 5 along the circumferential direction of the collet 5. A portion between the adjacent first slits 54 constitutes the pressure contact piece 58.

  The second slit 55 is a slit extending in the axial direction from the tip of the collet 5 to the middle. That is, the second slit 55 is open to the tip side of the collet 5. The second slits 55 are arranged at equiangular intervals around the central axis of the collet 5 along the circumferential direction of the collet 5. When the casing 18 is inserted into the collet 5 and the small-diameter portion 53 is expanded by the second slit 55, the large-diameter portion 51 of the collet 5 is slightly narrowed accordingly, so that the small-diameter portion 53 can be easily expanded. it can. By adjusting settings such as the number and size of the second slits 55, the elastic force of the collet 5 can be adjusted to an optimum predetermined value. It is not always necessary to provide the second slit 55 as long as the optimum elastic force can be set only by the first slit 54.

  Further, the distal end of the first slit 54 is located on the distal end side with respect to the proximal end of the second slit 55. That is, the first slit 54 and the second slit 55 overlap each other in the large diameter portion 51 and the tapered portion 52 when viewed from the direction perpendicular to the axis of the collet 5. Thereby, the small diameter part 53 can spread more reliably.

  The distal end of the first slit 54 may be located closer to the proximal end side than the proximal end of the second slit 55, and the positions of the distal end of the first slit 54 and the proximal end of the second slit 55 are collet. 5 may coincide with each other in the axial direction.

  The tip of the first slit 54 may be located in any of the large diameter part 51, the taper part 52, and the small diameter part 53, but may be located in the large diameter part 51 or the taper part 52. preferable. In the present embodiment, the tip of the first slit 54 is located in the large diameter portion 51. That is, the first slit 54 passes through the small diameter portion 53 and the tapered portion 52 in the axial direction of the collet 5. Thereby, the small diameter part 53 can spread more reliably.

  The proximal end of the second slit 55 may be located in any of the large diameter part 51, the tapered part 52, and the small diameter part 53, but is located in the large diameter part 51 or the tapered part 52. Is preferred. In the present embodiment, the base end of the second slit 55 is located in the large diameter portion 51 or the tapered portion 52.

  In the puncture device 1, when the casing 18 is inserted into the collet 5 from the state shown in FIG. 10 as shown in FIGS. 9 and 11, the three ribs having the higher height among the six ribs 44. 44a is pressed in the direction in which the small diameter part 53 spreads. As a result, the first slit 54 widens the small-diameter portion 53, and the inner diameter of the small-diameter portion 53 increases. The elastic force of the collet 5 causes the small-diameter portion 53 to be formed on the outer peripheral portion of the casing 18, that is, Press contact. In this case, the small-diameter portion 53, that is, each press contact piece 58, tightens the casing 18 from the outer periphery toward the center at three locations on the outer periphery.

  Further, as shown in FIG. 7, the first slit 54 and the second slit 55 of the collet 5 and the ribs 162 of the front end member 118 described above are aligned in the circumferential direction of the collet 5. Yes.

  On the other hand, when the casing 18 of the puncture needle tip 12 is mounted on the mounting portion 150, each rib 44 of the casing 18 is located between two adjacent ribs 162 of the mounting portion 150, and therefore, as shown in FIG. Thus, when the casing 18 is inserted into the collet 5, the rib 44 can be prevented from fitting into the first slit 54. As a result, when the casing 18 is inserted into the collet 5, the three ribs 44 a having the higher height among the six ribs 44 can surely press the respective pressure contact pieces 58, and the small-diameter portion 53 is surely secured. Can spread.

  As shown in FIGS. 5 to 8, a flange 56 protruding in the radial direction of the collet 5 is formed on the outer peripheral surface of the tip of the large-diameter portion 51 of the collet 5. Each second slit 55 is also formed in the flange 56. That is, the flange 56 is divided into a plurality of parts by the second slits 55.

  In addition, a protruding portion 57 that protrudes in the radial direction of the collet 5 is formed at a predetermined position on the outer peripheral surface of the tip of the large diameter portion 51. The height of the protrusion 57, that is, the length of the protrusion 57 in the radial direction of the collet 5 is set longer than the length of the flange 56 in the radial direction.

  The flange 56 of the collet 5 is inserted into a groove 164 formed in the mounting portion 150, and movement of the collet 5 in the axial direction with respect to the mounting portion 150 is prevented. Accordingly, the flange 56 of the collet 5 and the groove 164 of the mounting portion 150 constitute a movement blocking means for blocking the movement of the collet 5 in the axial direction with respect to the mounting portion 150.

  Further, the protruding portion 57 of the collet 5 is inserted into a groove 166 formed in the mounting portion 150, and the rotation of the collet 5 around its axis with respect to the mounting portion 150 is prevented. Accordingly, the protrusion 57 of the collet 5 and the groove 166 of the mounting portion 150 constitute a rotation blocking means for blocking the rotation of the collet 5 around the axis with respect to the mounting portion 150. Note that the mounting portion 150 may be formed with a through-hole into which the protruding portion 57 is inserted instead of the groove 166.

  Moreover, it does not specifically limit as a constituent material of the collet 5, For example, although various metal materials, various resin materials, etc. are mentioned, a metal material is preferable. By configuring the collet 5 with a metal material, it is possible to ensure strength while reducing the thickness of the collet 5 and to obtain a sufficient elastic force.

  Next, the operation of the puncture device set 10 and the puncture apparatus 1 configured as described above will be described.

  As shown in FIG. 13A, first, the user grasps an unused puncture needle tip 12 to which the puncture device 1 and the cap 14 are attached, and attaches the puncture needle tip 12 to the attachment hole 153 of the puncture device 1. And push it toward the rear end. At this time, the gripping bar 134 of the plunger 106 is engaged with the gripped protrusion 28 of the hub 22. That is, the puncture needle 15 is attached to the plunger 106.

  As shown in FIG. 13B, when the puncture needle tip 12 is pushed further toward the rear end side, the drive coil spring 108 is compressed from the casing 18 through the hub 22 and the plunger 106, and the The cup-shaped rear end of one spring seat 130 abuts on the front end surface 112 a of the rear end member 112. This restricts the movement of the plunger 106 toward the rear end. Further, after the elastic piece 136 is elastically deformed once, the first protrusion 140 is engaged with the trigger stopper 154 and the plunger 106 is fixed in a compressed state.

  The fitting force between the peripheral surface 30 of the hub 22 and the rear annular bulging portion 40 of the casing 18 is stronger than the elastic force of the driving coil spring 108, and the fitting between the hub 22 and the casing 18 is released. There is no.

  At this stage, the plunger 106 reaches the preparation position for puncturing and is fixed by the trigger stopper 154, but the engagement between the hub 22 and the casing 18 is not released, and the skirt 41 covers the mounting portion 150. Absent. However, the puncture needle 15 has reached the firing preparation position.

  As shown in FIG. 13C, when the puncture needle tip 12 is pushed further toward the rear end side, the plunger 106 is restricted from moving toward the rear end side by the front end surface 112a. The force is directly applied to the engaging portion between the peripheral surface 30 of the sliding support portion 26 in the hub 22 and the rear annular bulging portion 40 of the casing 18, and the engagement of the engaging portion is released. That is, the positions of the hub 22 and the plunger 106 do not change, but the casing 18 moves relatively rearward. The mounting portion 150 is fitted into the fitting gap 41a (see FIG. 2) of the skirt 41, and the rear end portion 41b of the skirt 41 comes into contact with the receiving seat 151 and stops. There is a slight gap between the front end portion of the mounting portion 150 and the bottom end surface of the fitting gap portion 41a (see FIG. 14B), and the rear end portion 41b reliably contacts the receiving seat 151. In this way, the casing 18 is mounted on the mounting portion 150. That is, the puncture needle tip 12 is securely mounted at a specified position.

  At this time, when the rear end of the casing 18 presses the front end surface of the second connecting body 124, the pusher 120 is pushed rearward through the second connecting body 124 and the first connecting body 122 and protrudes from the rear end. To do.

  At this time, the two ribs 162 of the mounting portion 150 are positioned between the two adjacent ribs 44 of the casing 18, that is, between the two adjacent ribs 162 and every other rib. 44 is located. In this state, the casing 18 moves, is inserted into the collet 5, and is pressed by the three ribs 44 a having the higher height among the six ribs 44, so that the small-diameter portion 53 is expanded and the corresponding pressure contact piece 58 is The ribs 44a of the casing 18 are pressed against each other. Then, the small pressure contact piece 58 undergoes the largest elastic deformation, the large pressure contact piece 58 undergoes the smallest elastic deformation, and the inner pressure contact piece 58 elastically deforms to a size therebetween, whereby the shaft of the casing 18 is mounted. Inclined with respect to the axis of the portion 150. Thereby, it is possible to prevent the casing 18 of the attached puncture needle tip 12 from moving unintentionally in the direction of detachment from the attachment portion 150.

  At this time, the mounting portion 150 is completely covered by the skirt 41 and is not visible from the outside.

  Next, the cap 14 is extracted from the tip body 13 of the puncture needle tip 12 in the distal direction. At this time, even when the cap 14 is pulled in a direction inclined from the axial direction of the chip body 13, the movement of the casing 18 in the direction of detachment from the mounting portion 150 is reliably prevented by the collet 5. Thereby, it can prevent that the unused puncture needle tip 12 will be in the state which cannot be used before use, or the state which a needle point does not fully protrude.

  Next, the tip of the tip body 13 is pressed against the skin of the measurer, for example, a finger, palm, arm, etc., and the puncture button 116 is pressed. As a result, as shown in FIG. 14 (a), the first protrusion 140 is pushed down by the puncture button 116, the engagement state between the trigger stopper 154 and the first protrusion 140 is released, and the plunger 106 is driven elastically. Driven forward by the coil spring 108, the puncture needle 15 is pushed out through the gripping bar 134.

  At this time, the sliding ring 16 is pushed out simultaneously with the puncture needle 15 while being in contact with the minute step 24 a, and excessive advancement is restricted by the inner circumferential step portion 34.

  The needle tip of the needle 20 provided on the puncture needle 15 projects from the opening 42 and punctures the skin. The position of the puncture needle 15 at this time is the puncture position (FIG. 14 (a)). At this time, the plunger 106 compresses the return coil spring 110 appropriately. Therefore, the plunger 106 is immediately pushed back backward by the elastic force of the return coil spring 110 returning to its original length. By such a puncture mechanism, a puncture operation is performed in which the puncture needle 15 is moved from the firing preparation position to the puncture position and then moved to the proximal end side.

  In addition, the length of the needle tip of the puncture needle 15 connected to the plunger 106 that protrudes momentarily from the opening 42 is limited and adjusted by the small protrusion 138 of the plunger 106 coming into contact with the stepped portion 139.

  When the plunger 106 is retracted, the sliding ring 16 is integrally retracted because it is engaged with the four elastic levers 24. A blood glucose level is measured by a predetermined blood glucose measuring device using blood flowing out from the punctured skin, and then the puncture needle tip 12 is removed from the puncture device 1.

  As shown in FIG. 15A, by pushing the pusher 120, the rear end surface of the casing 18 is pressed via the first connecting body 122 and the second connecting body 124, and the used puncture needle tip 12 is directly attached. It can be removed without touching it. The removed puncture needle tip 12 is discarded by a predetermined method.

  Further, as shown in FIG. 15B, when the pusher 120 is pushed toward the distal end side, the hub 22 does not move because it is initially held by the gripping bar 134. On the other hand, since the sliding ring 16 engages with the front bulging portion 36 and moves forward together with the casing 18, the sliding ring 16 is disengaged from the elastic lever 24 and is disengaged. When the elastic lever 24 is removed from the sliding ring 16, the elastic lever 24 is once elastically reduced in diameter, and then returns to its original diameter. Thereafter, the hub 22 also engages with the rear annular bulging portion 40 and moves forward integrally with the casing 18, and the puncture needle tip 12 is removed from the puncture device 1.

  In the removed puncture needle tip 12, the elastic lever 24 comes out of the sliding ring 16 and has a diameter larger than the inner diameter of the sliding ring 16, so that the sliding ring 16 moves the elastic lever 24 forward. regulate. That is, the sliding ring 16 serves as a movement restricting means that restricts the relative movement of the hub 22 in the forward direction with respect to the casing 18 at a predetermined position, and the needle tip of the needle 20 does not protrude from the tip surface again. As a result, even when the puncture needle tip 12 is discarded, it is possible to prevent the skin or the like from being damaged by the needle 20 and to reduce the risk of infection. Note that the rear annular bulging portion 40 restricts the movement of the hub 22 in the rear, and the puncture needle 15 does not come out from the rear end side.

  By the way, depending on the user, it is conceivable that the used puncture needle tip 12 is mistakenly attached to the puncture apparatus 1.

  In this case, the gripping bar 134 engages with the gripped protrusion 28 of the hub 22 and pushes the plunger 106 backward, but the hub 22 is disposed slightly forward after the initial engagement with the rear annular bulging portion 40 is released. Therefore, the plunger 106 cannot be moved sufficiently backward. Therefore, the first protrusion 140 is not engaged with the trigger stopper 154, the driving coil spring 108 is not biased, and the puncturing operation is not performed even if the puncturing button 116 is pressed.

  Further, since the front end of the elastic lever 24 abuts on the rear end of the sliding ring 16 and restricts the casing 18 from moving rearward relative to the hub 22, the casing 18 is pushed further rearward. However, the drive coil spring 108 is only slightly compressed, and when it is released, it is pushed back by the elastic force of the drive coil spring 108. As a result, the rear end portion 41b of the skirt 41 does not come into contact with the receiving seat 151, and a slight gap is generated, so that the mounting portion 150 is visually recognized from the side. As a result, the user can easily recognize that the attached puncture needle tip 12 has been used.

  As described above, according to the puncture device 1, the pressure contact pieces 58 having different elastic constants of the collet 5 are provided on the ribs 44 a of the casing 18 in a state where the casing 18 of the puncture needle tip 12 is mounted on the mounting portion 150. Because of the pressure contact, the small pressure contact piece 58 undergoes the largest elastic deformation, the large pressure contact piece 58 undergoes the smallest elastic deformation, and the inner pressure contact piece 58 elastically deforms to the size between them, whereby the shaft of the casing 18 is deformed. Is inclined with respect to the axis of the mounting portion 150. Thereby, it is possible to prevent the casing 18 of the attached puncture needle tip 12 from moving unintentionally in the direction of detachment from the attachment portion 150.

  As a result, the used unused puncture needle tip 12 becomes unusable before use, and the needle tip of the needle 20 does not protrude from the tip opening of the casing 18 during use. Can be prevented. At the same time, it is possible to make a fine setting of the pressure contact force so that the force required to attach or remove the puncture needle tip 12 does not become excessive.

  In the present embodiment, the elastic constants of the pressure contact pieces 58a to 58f are set by adjusting the length of the second slit 55. However, the present invention is not limited to this. For example, the following methods (1) to (3) Is mentioned.

  (1) As shown in FIG. 16, the elastic constants of the pressure contact pieces 58 a to 58 f are set by adjusting the width of the second slit 55.

  That is, the width of the second slit 55 is minimized in the case of the “large” pressure contact piece 58, and the width of the second slit 55 is maximized in the case of the “small” pressure contact piece 58. In the case of 58, the width of the second slit 55 is between its maximum and minimum.

  (2) As shown in FIG. 17, the elastic constants of the pressure contact pieces 58 a to 58 f are set by adjusting the length of the tapered portion 52.

  That is, in the case of the “large” pressure contact piece 58, the length of the taper portion 52 is minimum, and in the case of the “small” pressure contact piece 58, the length of the taper portion 52 is maximum, and the “medium” pressure contact piece. In the case of 58, the length of the tapered portion 52 is between the maximum and the minimum.

  (3) The elastic constants of the pressure contact pieces 58a to 58f are set by adjusting the thickness of the pressure contact pieces 58a to 58f.

  That is, in the case of the “large” pressure contact piece 58, the thickness of the pressure contact piece 58 is the maximum, and in the case of the “small” pressure contact piece 58, the thickness of the pressure contact piece 58 is the minimum, and the “medium” pressure contact piece 58. In this case, the thickness of the pressure contact piece 58 is between the maximum and the minimum.

  As mentioned above, although the puncture apparatus of this invention was demonstrated based on embodiment of illustration, this invention is not limited to this, The structure of each part is substituted by the thing of the arbitrary structures which have the same function. be able to. In addition, any other component may be added to the present invention.

  Moreover, in the said embodiment, although the convex part of the casing of a puncture needle chip | tip is a rib, it is not restricted to this in this invention, For example, a thing of a shape short in an axial direction like a protrusion may be sufficient. .

  Further, in the present invention, the press contact means may not have a cylindrical shape, and may be constituted by only a plurality of press contact pieces, for example.

DESCRIPTION OF SYMBOLS 1 Puncture apparatus 10 Puncture instrument set 12 Puncture needle tip 13 Tip body 14 Cap 15 Puncture needle 16 Sliding ring 18 Casing 20 Needle 22 Hub 24 Elastic lever 24a Minute step 26 Sliding support portion 28 Grasping protrusion 30 Circumferential surface 32 Reduced diameter Part 34 inner circumferential step part 36 front bulging part 40 rear annular bulging part 41 skirt 41a fitting gap part 41b rear end part 42 opening part 44, 44a rib 5 collet 50 base part 51 large diameter part 52 taper part 53 small diameter part 54 First slit 55 Second slit 56 Flange 57 Protruding portion 58, 58a, 58b, 58c, 58d, 58e, 58f Pressure contact piece 102 Case body 104 Dial portion 106 Plunger 108 Driving coil spring 110 Returning coil spring 112 Rear end member 112a Front end face 114 holes 16 Puncture button 118 Front end member 118a First member 118b Second member 120 Pusher 122 First connector 124 Second connector 130 First spring seat 132 Second spring seat 134 Grasping bar 136 Elastic piece 138 Small protrusion 139 Step 140 1 projection 142 2nd projection 144 opening 150 mounting portion 151 cylinder tip (receiving seat)
152 Holding portion 153 Mounting hole 154 Trigger stopper 156 Arm 158 Engagement piece 159 Protrusion 162 Rib 164, 166 Groove

Claims (5)

A puncture needle having a needle body having a sharp needle tip at a distal end and a needle hub fixed to a proximal end portion of the needle body; and storing the puncture needle movably along an axial direction thereof, A puncture needle tip having a cylindrical casing having three or more convex portions provided along the circumferential direction of the outer peripheral surface is detachably attached to the distal end portion and used. A puncture device,
A hollow housing having a mounting portion at a tip portion to which the casing is detachably mounted;
Provided along the circumferential direction inside the mounting portion, and when the casing is mounted on the mounting portion, the three or more convex portions of the casing are elastically deformed by contact with the three or more convex portions. Pressure contact means each having a plurality of pressure contact pieces having different elastic constants,
The puncture apparatus, wherein the pressure contact pieces having different elastic constants are in pressure contact with two of the convex portions in a state where the casing is mounted on the mounting portion. A puncture needle having a needle body having a sharp needle tip at a distal end and a needle hub fixed to a proximal end portion of the needle body; and storing the puncture needle movably along an axial direction thereof, A puncture needle tip having a cylindrical casing having three or more convex portions provided along the circumferential direction of the outer peripheral surface is detachably attached to the distal end portion and used. A puncture device,
A hollow housing having a mounting portion at a tip portion to which the casing is detachably mounted;
Provided along the circumferential direction inside the mounting portion, and when the casing is mounted on the mounting portion, the three or more convex portions of the casing are elastically deformed by contact with the three or more convex portions. Pressure contact means each having a plurality of pressure contact pieces having different elastic constants,
When the casing is mounted on the mounting portion, the axis of the casing is inclined by the resultant force of the press contact pieces that press contact with the convex portions regardless of the position of the casing in the rotational direction with respect to the press contact pieces. A puncture apparatus characterized by being configured as described above.   2. The structure having the largest elastic constant among the pressure contact pieces in a state where the casing is mounted on the mounting portion is configured to press contact with only one of the convex portions. 2. The puncture device according to 2. The elastic constant of each pressure contact piece is set to three or more stages,
The puncture device according to any one of claims 1 to 3, wherein the pressure contact pieces having different elastic constants are in pressure contact with the convex portions in a state where the casing is mounted on the mounting portion. The press contact means has a cylindrical shape, and includes a press contact member into which the casing is inserted when the casing is mounted on the mounting portion.
The pressure contact member is provided with a plurality of first slits extending in the axial direction of the pressure contact member from the proximal end to the middle of the pressure contact member along the circumferential direction of the pressure contact member, and adjacent to the pressure contact member. The puncture device according to any one of claims 1 to 4, wherein a portion between the first slits constitutes the pressure contact piece.

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