WO2018123535A1 - Disposable puncturing instrument - Google Patents

Abstract

Provided is a disposable puncturing instrument having a novel structure that enables a lancet to be held at a puncturing-ready position and a puncturing operation to be performed with certainty and with a stable operation. In a disposable puncturing instrument 10, a lock ring 72 is disposed inside a housing 12, a lancet 14 is provided with a lock protrusion 60, and the lancet 14 is held at a puncturing-ready position by locking action of the lock protrusion 60 onto the lock ring 72. An operation member 20 is provided that enables a puncturing operation to be performed by causing the lock ring 72 to rotate so that the locking of the lock protrusion 60 to the lock ring 72 is released and the lancet 14 is displaced in a protruding direction. In addition, regulating means 84, 88 are provided that regulate lock ring 72 rotation that is not based on operation of the operation member 20, such regulation carried out by exerting resistance against the rotation of the lock ring 72 in a state where rotation of the lock ring 72 is permitted.

Description

Disposable puncture device

The present invention relates to a puncture device that is used to puncture the skin and collect a small amount of blood, and more particularly to a disposable puncture device that is discarded after a single use.

• For medical purposes, it may be necessary to collect a small amount of blood. For example, a diabetic patient needs to collect his / her own blood in order to regularly check the blood glucose level (blood glucose self-measurement: SMBG). Conventionally, a puncture device has been used so that such blood self-collection can be performed safely and reliably. In particular, disposable puncture devices that are discarded after one-time use have been provided for the purpose of preventing infection.

Such a puncture device is generally configured such that a lancet housed in a housing is urged by a spring member, and a puncture body provided at the tip of the lancet is projected from the housing to perform a puncture operation. Specifically, as described in Japanese Patent Application Publication No. 2007-521031 (Patent Document 1), with the lancet locked in the housing, the operation member of the housing was pushed and arranged behind the lancet. The spring member is compressed and deformed. When the compression force of the spring member increases and the locking is released, the lancet protrudes from the housing and is punctured.

However, in such a conventional puncture device, it has been difficult to accurately set the compression force of the spring member that is required to release the lancet from being locked into the housing. Therefore, since the lancet is released and the puncture operation is performed even though the spring member is not sufficiently compressed, the puncture force is not exerted and the blood exudation amount is insufficient. In some cases, it was difficult to perform the puncture operation without releasing the locking of the lancet even when pressed strongly.

In Japanese translations of PCT publication No. 2007-536008 (Patent Document 2) and Japanese Patent No. 3964457 (Patent Document 3), a pressing operation member for compressing and deforming a spring member is provided with an abutment portion for unlocking. A structure has been proposed in which, when the pressing operation member reaches a predetermined position, the abutting portion abuts on the locking piece of the lancet locked to the housing to release the locking. However, in these puncture devices, in addition to compressing and deforming the spring member, the force required for deforming and releasing the latching piece of the lancet must be exerted on the pressing operation member. Inevitably increased.

Further, in International Publication No. 2005/110225 (Patent Document 4) and US Patent Application Publication No. 2005/0070945 (Patent Document 5), a locking piece to the housing of the lancet is pressed from the lateral direction. Although a structure in which the lock is released and the protrusion is operated is also disclosed, the central axis of the lancet shifts and is caught by other members when a pressing force from the lateral direction is exerted on the locking piece provided on the lancet. Since the frictional resistance at the time of the protrusion operation is increased by being pressed against the other member, the movement of the lancet at the time of the protrusion operation may be hindered.

On the other hand, in Japanese Patent No. 3993529 (Patent Document 6), the lancet is rotatable in the circumferential direction with respect to the housing, and the locking of the lancet to the seating surface formed on the inner surface of the housing is released by rotating the lancet. Although the structure to be disclosed is also disclosed, if the lancet is rotated by applying a rotational force to the lancet, there is a risk that it will be difficult to ensure sufficient release of locking and stability of the protrusion operation due to deformation or displacement of the lancet. It is difficult to rotate only the lancet while being urged by the spring member, and there is a possibility that the urging operation is adversely affected by deformation of the spring member.

In Japanese translations of PCT publication No. 2007-536000 (Patent Document 7), the lancet is urged and rotated by abutting the shielding object against the skin and being pushed inward of the housing. There is a disclosure of a puncture device in which puncture is performed by disengaging from the lancet. However, there is a possibility that the operation of unscrewing or pulling the tip guard (needle cap) before puncturing may cause the lancet to rotate unintentionally and cause the malfunction of the engagement between the shield and the lancet.

Special Table 2007-52031 Special table 2007-536008 gazette Japanese Patent No. 3964457 International Publication No. 2005/110225 US Patent Application Publication No. 2005/0070945 Japanese Patent No. 3993529 Special Table 2007-536000

The present invention has been made in the background of the above-mentioned circumstances, and the problem to be solved is holding the lancet in the compressed position of the spring member at the puncture preparation position, and puncturing operation by releasing the lock. It is an object of the present invention to provide a disposable puncture device having a novel structure that can be reliably and stably operated.

A first aspect of the present invention is a disposable puncture device in which a lancet accommodated in a housing is urged by a spring member, and a puncture body provided at the tip of the lancet projects from the housing to perform a puncture operation A locking ring is disposed in the housing, the lancet penetrates the locking ring and is displaceable in a protruding direction, and the lancet is provided with a locking projection, The spring member is compressed and deformed by the locking action of the locking protrusion on the locking ring, and the lancet is held at the puncture preparation position at the back of the housing. An operation member is provided for releasing the locking of the locking projection to the locking ring by rotating the locking ring and displacing the lancet in the protruding direction by the spring member to perform a puncturing operation. Furthermore, in a state in which the rotation of the locking ring is allowed, a restriction that restricts the rotation of the locking ring that is not based on the operation of the operation member by exerting a resistance to the rotation of the locking ring. Means are provided.

According to the disposable puncture device constructed in accordance with this aspect, a locking ring separate from the housing and the lancet is adopted, and the locking ring is rotated to be biased by a spring member to prepare for puncturing. The lancet held in position can be unlocked and puncture operation can be performed. Therefore, the spring member compressed in advance at the puncture preparation position can exert a stable urging force on the lancet to perform the puncture operation. Further, since it is avoided that the operating force for puncturing operation is applied directly to the lancet in the lateral direction, there is an increase in hooking and frictional force on other members due to the deviation of the central axis of the lancet. This prevents a stable puncturing operation. Moreover, unlike the lancet biased by the spring member, the locking ring that is operated to rotate can only be rotated, so that the puncture operation can be easily and stably performed. .

In this aspect, in the state where the rotation of the locking ring is permitted, a restricting means for restricting the rotation of the locking ring that is not based on the operation of the operation member is provided. It is possible to prevent the locking ring from unintentionally rotating before the operation and releasing the locking projection from the locking ring. Therefore, the lancet can be stably held at the puncture preparation position before the operation member is operated, and the puncture operation by the operation of the operation member is realized.

According to a second aspect of the present invention, in the disposable puncture device according to the first aspect, an inner and outer periphery in which the locking ring and the housing that rotatably supports the locking ring are opposed in a radial direction. The restricting means is configured by providing a contact portion that generates resistance due to mutual contact during relative rotation on the surface.

According to the disposable puncture device having the structure according to this aspect, since the contact portion that constitutes the restricting means is provided between the locking ring and the housing in the radial direction, the resistance force by the contact portion is reduced. It is possible to avoid being directly applied to the lancet.

According to a third aspect of the present invention, in the disposable puncture device according to the second aspect, the housing includes a housing main body and a housing mouth provided on a distal end side of the housing main body, The housing mouth body is provided with a support cylinder portion extending toward the base end side, and the locking ring is extrapolated to the support cylinder portion, and the support cylinder portion and the locking ring The abutting part is provided between the radial directions.

According to the disposable puncture device structured according to this aspect, the locking ring can be rotatably supported on the inner peripheral surface and disposed in the housing.

According to a fourth aspect of the present invention, in the disposable puncture device according to the third aspect, an inner peripheral convex portion extending in the axial direction is provided on the outer peripheral surface of the support cylinder portion, and the locking ring An outer peripheral convex portion extending in the axial direction is provided on the inner peripheral surface of the inner peripheral surface, and the inner peripheral convex portion and the outer peripheral convex portion are provided when the locking ring is rotated relative to the support tube portion in the circumferential direction. Abut against each other to resist the rotation of the locking ring with respect to the housing, and the inner circumferential convex portion and the outer circumferential convex portion cross over each other, thereby causing the operation member to operate based on the operation of the operating member. The contact portion that allows the locking ring to rotate is configured.

According to the disposable puncture device having the structure according to this aspect, the contact ring is inadvertently restricted by the contact between the inner peripheral convex portion and the outer peripheral convex portion, while the operation member is engaged. After the stop ring is rotated and the outer circumferential convex portion gets over the inner circumferential convex portion, the locking ring can be smoothly rotated to realize a good puncturing operation.

According to a fifth aspect of the present invention, in the disposable puncture device according to the fourth aspect, the inner peripheral side convex portion and the outer peripheral side convex portion are arranged in the circumferential direction with the support tube portion and the locking ring. Are provided at equal intervals in the circumferential direction.

According to the disposable puncture device having the structure according to this aspect, when the puncture operation is performed by the operation member, the overpass reaction force of the outer peripheral convex portion exerted in the direction perpendicular to the axis of the locking ring with respect to the inner peripheral convex portion is plural. It is canceled out between the inner and outer convex portions. As a result, the axial perpendicular displacement between the lancet to be punctured and the locking ring is suppressed, and the puncture operation can be further stabilized.

According to a sixth aspect of the present invention, there is provided the disposable puncture device according to the first aspect, wherein the locking ring includes an axially front surface of the locking ring and the housing that rotatably supports the locking ring. The restricting means is configured by providing a contact portion that generates resistance due to mutual contact during relative rotation between the axially facing surface of the ring facing the axially front surface. is there.

According to the disposable puncture device having the structure according to this aspect, the contact portion constituting the restricting means is provided between the axially opposed surfaces of the locking ring and the housing. Even when the stop ring is rotated, the action of the external force in the direction perpendicular to the axis with respect to the lock ring, and hence the axial displacement between the lock ring and the lancet in the direction perpendicular to the axis can be suppressed.

According to a seventh aspect of the present invention, in the disposable puncture device according to the sixth aspect, the axially opposed surface of the housing is provided with the locking when the locking ring is rotated relative to the housing. The abutting portion that abuts on the ring and moves the locking ring to the rear side in the axial direction is provided, and the rotation of the locking ring based on the operation of the operating member locks the locking ring. The locking ring is allowed to move rearward in the axial direction by the corresponding contact portion against the urging force of the spring member exerted by the lancet.

According to the disposable puncture device structured in accordance with this aspect, it is possible to constitute a restricting means for restricting inadvertent rotation of the locking ring by skillfully utilizing the urging force of the spring member that punctures the lancet. .

According to an eighth aspect of the present invention, in the disposable puncture device according to the first aspect, the axially rear surface of the locking ring, and the locking protrusion of the lancet locked to the locking ring The restricting means is configured by providing an abutting portion that generates a resistance due to mutual abutting with respect to relative rotation.

According to the disposable puncture device having the structure according to this aspect, the contact portion constituting the restricting means is provided between the axially opposed surfaces of the locking ring and the lancet. Even when the ring is rotated, the action of the external force in the direction perpendicular to the axis with respect to the locking ring, and hence the axial displacement between the locking ring and the lancet in the direction perpendicular to the axis can be suppressed. Further, the restricting means for restricting inadvertent rotation of the locking ring can be configured by skillfully using the locking protrusion of the lancet.

According to a ninth aspect of the present invention, in the disposable puncture device according to the eighth aspect, an axial convex portion is provided on the axially rear surface of the locking ring, and the locking ring has a circumferential surface with respect to the housing. In the relative rotation of the direction, the locking projection of the lancet and the axial convex portion of the locking ring abut against each other to resist the rotation of the locking ring, and the lancet Moves to the rear side against the urging force of the spring member and escapes the axial convex portion of the locking ring, thereby allowing the locking ring to rotate based on the operation of the operating member. It is what.

According to the disposable puncture device having the structure according to this aspect, the locking ring that is not based on the operation of the operating member by the axial projection provided on the locking ring and the locking projection of the lancet contacting each other. When the operating member is operated to perform puncturing, the lancet is moved rearward in the axial direction by the axial convex portion, and the contact between the axial convex portion and the locking projection is The contact is released and the locking ring can be allowed to rotate.

According to the disposal-type puncture device having the structure according to the present invention, the lancet is released from the lancet that is biased by the spring member and held in the puncture preparation position by rotating the locking ring. Can be operated. In particular, since the restricting means for restricting the rotation of the locking ring not based on the operation of the operation member is provided, the locking ring is prevented from unintentionally rotating, and before the operation member is operated. The lancet can be more reliably held at the puncture preparation position, and the puncture operation can be performed more reliably by operating the operation member.

The whole top view which shows the standard state of the disposable puncture device as the 1st Embodiment of this invention. The disassembled perspective view of the puncture device shown by FIG. III-III sectional view of FIG. IV-IV sectional drawing of FIG. FIG. 5 is a VV cross-sectional view of FIG. 3. The principal part enlarged view of FIG. The perspective view of the latching ring which comprises the puncture device shown by FIG. The rear view for demonstrating the effect | action of the latching ring in the standard state or puncture preparation state shown by FIG. The front view for demonstrating the effect | action of the locking ring in the standard state or puncture preparation state shown by FIG. The longitudinal cross-sectional view corresponding to FIG. 3 which shows the puncture preparation state of the puncture device shown by FIG. XI-XI sectional drawing of FIG. The cross-sectional view corresponding to FIG. 5 for demonstrating the puncture operation | movement of the puncture device shown by FIG. The rear view for demonstrating the effect | action of the latching ring in the puncture operation state shown by FIG. The front view for demonstrating the effect | action of the locking ring in the puncture operation state shown by FIG. The longitudinal cross-sectional view corresponding to FIG. 3 which shows the puncture operation state of the puncture device shown by FIG. XVI-XVI sectional drawing of FIG. The longitudinal cross-sectional view corresponding to FIG. 3 which shows after the puncture of the puncture device shown by FIG. XVIII-XVIII sectional drawing of FIG. The longitudinal cross-sectional view corresponding to FIG. 3 for demonstrating the action | operation of the reuse prevention of the puncture device shown by FIG. XX-XX sectional drawing of FIG. The perspective view of the housing mouth which comprises the housing of the puncture device shown by FIG. The perspective view of the latching ring which comprises the puncture device shown by FIG. The perspective view which shows the assembly body of the housing opening shown in FIG. 21 and the latching ring shown in FIG. 22 in a standard state or a puncture preparation state. FIG. 24 is an enlarged cross-sectional view of the XXIV-XXIV cross section in FIG. FIG. 25 is a cross-sectional view of the assembly of the housing mouth body and the locking ring in the puncture operation state or the state after puncture, and corresponds to FIG. 24. The longitudinal cross-sectional view which shows the standard state of the disposable puncture device as the 2nd Embodiment of this invention. XXVII-XXVII sectional drawing of FIG. XXVIII-XXVIII sectional drawing of FIG. FIG. 27 is an exploded perspective view of the puncture device shown in FIG. 26. FIG. 27 is an explanatory view of the action of the locking ring in the standard state or the puncture preparation state shown in FIG. 26, and is a sectional view taken along the line XXX-XXX in FIG. 31. The rear perspective view for demonstrating the effect | action of the latching ring in the puncture preparation state shown by FIG. The longitudinal cross-sectional view corresponding to FIG. 26 which shows the puncture preparation state of the puncture device shown by FIG. FIG. 29 is a transverse cross-sectional view corresponding to FIG. 28 for illustrating the puncturing operation of the puncture device shown in FIG. 26. FIG. 36 is an explanatory view of the action of the locking ring in the puncture operation state or the state after puncture shown in FIG. 33, and is a sectional view taken along the line XXXIV-XXXIV in FIG. The rear perspective view for demonstrating the effect | action of the latching ring in the puncture operation state shown by FIG. The longitudinal cross-sectional view corresponding to FIG. 26 which shows the puncture operation state of the puncture device shown by FIG. The longitudinal cross-sectional view corresponding to FIG. 26 which shows after the puncture of the puncture device shown by FIG. The longitudinal cross-sectional view corresponding to FIG. 26 for demonstrating the operation | movement of the reuse prevention of the puncture device shown by FIG. XXXIX-XXXIX sectional view of FIG. The perspective view of the housing mouth which comprises the housing of the disposable puncture device as the 3rd Embodiment of this invention. XLI-XLI sectional view in FIG. The perspective view of the latching ring which comprises the disposable puncture device as the 3rd Embodiment of this invention. 43 is a front view of the locking ring shown in FIG. 42. FIG. FIG. 43 is a longitudinal sectional view showing an assembly of the housing mouth body shown in FIG. 40 and the locking ring shown in FIG. 42 in a standard state or a puncture preparation state, and a sectional view corresponding to FIG. FIG. 45 is a longitudinal sectional view of an assembly of a housing mouth body and a locking ring in a puncture operation state or a state after puncture, corresponding to FIG. 44. The perspective view of the latching ring which comprises the disposable puncture device as the 4th Embodiment of this invention. FIG. 47 is a rear view of the locking ring shown in FIG. 46. FIG. 47 is a perspective view showing the locking ring shown in FIG. 46 in the assembled state of the lancet and the housing mouth, and showing the puncture preparation state. FIG. 49 is a cross-sectional view of IL-IL in FIG. 48.

Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention relating to a disposable puncture device will be described in detail with reference to the drawings. In the following description of the embodiment, for ease of understanding, first, the basic structure and operation of the disposable puncture device will be described, and then a characteristic configuration of the present invention will be described. A regulating means for regulating inadvertent rotation of the stop ring will be described in detail. Therefore, in FIGS. 1 to 20 referred to in the description of the basic structure, the detailed structure related to the regulating means is omitted, and the detailed structure will be described with reference to FIGS. .

[I] Basic Structure and Operation of Disposable Puncture Device as First Embodiment First, FIG. 1 shows a plan view of a disposable puncture device 10 according to the first embodiment of the present invention. An exploded perspective view, a longitudinal sectional view, and a transverse sectional view thereof are shown in FIGS. 1, 3, 4, and 5 all show the puncture device 10 in a state (standard state) provided as a product to the user in the market. In this puncture device 10, a lancet 14 and a compression coil spring 16 as a spring member are accommodated in the housing 12, and the needle cap 18 is removed from the lancet 14 to push the operation piece 20 of the housing 12. The lancet 14 protrudes from the housing 12 and is punctured. In the following description, unless otherwise specified, the center axis direction refers to the center axis direction of the housing 12 and the lancet 14 (left-right direction in FIG. 1), and the left direction in FIG. The direction is referred to as the front or distal end side, and the right direction is referred to as the rearward or proximal end side.

More specifically, the housing 12 is constituted by a housing main body 22 and a housing mouth body 24 each made of a resin molded product. The housing main body 22 has a substantially bottomed cylindrical shape with a deep bottom, and a substantially cylindrical housing mouth body 24 is fixedly assembled to the opening portion on the front end side.

A spring seat 26 protruding inward from the center of the inner surface is provided on the bottom wall of the housing body 22. In addition, a plurality of guide protrusions 28 that protrude on the inner peripheral surface and extend linearly in the axial direction are provided on the cylindrical wall of the housing body 22. The plurality of guide protrusions 28 form a pair of guide rails 30, 30 facing each other in the direction perpendicular to the axis on the inner surface of the cylindrical wall of the housing body 22.

Further, an operation piece 20 as an operation member is formed on the cylindrical wall of the housing main body 22 in an opening side portion slightly larger in diameter than the bottom wall side portion. The operation piece 20 is disposed in a through window 34 formed on the peripheral wall of the housing body 22 and is partially connected to the housing body 22. The operation piece 20 is displaced toward the inside of the housing body 22 based on the elastic deformation of the connecting portion by pressing the operation piece 20 with the fingers from the outside of the housing body 22.

Furthermore, an engaging rib 36 that protrudes on the outer peripheral surface and extends in the circumferential direction is integrally formed at the opening peripheral edge of the cylindrical wall of the housing body 22. On the other hand, on the rear end side in the axial direction of the housing mouth body 24, a large-diameter engagement ring 38 that extends in the circumferential direction is integrally formed. Note that the engagement ring 38 is connected and supported to the housing mouth 24 by connecting leg portions 40 protruding at a plurality of positions on the outer peripheral surface of the housing mouth 24.

The housing body 24 is combined with the opening portion of the housing body 22, and the engagement ribs 36 of the housing body 22 are engaged with the engagement ring 38 of the housing body 24, whereby the housing body 22 is engaged with the housing body 22. The mouth body 24 is assembled. In this assembled state, the housing mouth 24 is positioned and fixed in the axial direction with respect to the housing main body 22 by the engaging action of the engaging rib 36 with respect to the engaging ring 38, and The housing mouth body 24 is positioned and fixed with respect to the housing main body 22 even in the circumferential direction by the engaging action with the connecting leg portion 40.

Further, the housing mouth 24 extends in a cylindrical shape toward the rear on the center axis on the inner peripheral side of the engagement ring 38, thereby forming a support cylinder portion 42 that enters the housing body 22. Yes. Further, the connecting leg portion 40 projecting on the outer peripheral surface of the housing mouth body 24 is formed to extend to the outer peripheral surface of the support cylinder portion 42 in a predetermined length in the axial direction. Furthermore, on the inner peripheral surface of the housing mouth body 24, a pair of cap locking projections 47, 47 located near the opening on the front side are formed so as to protrude opposite to each other in the direction perpendicular to the axis.

Further, on the inner peripheral surface of the housing mouth body 24, a pair of first guide grooves 44, 44 and a pair of second guide grooves 46, 46 are opposed to each other in the radial direction and extend parallel to the axial direction. Is formed. These first guide grooves 44, 44 and second guide grooves 46, 46 both extend from the axially intermediate portion of the housing mouth 24 to the inner peripheral surface of the support cylinder portion 42, and Opened at the rear end.

Particularly in this embodiment, the radial direction in which the pair of first guide grooves 44, 44 oppose each other and the radial direction in which the pair of second guide grooves 46, 46 oppose each other. The first guide groove 44 has a circumferential width dimension and a radial depth dimension that are larger than those of the second guide groove 46. A slit 44 penetrates the peripheral wall of the support cylinder portion 42.

In the housing 12 constituted by the housing main body 22 and the housing mouth body 24 as described above, the lancet 14 is incorporated in the internal space in the accommodated state. The housing mouth body 24 is preferably transparent or translucent so that the blood pool after puncture can be seen.

The lancet 14 is an insert-molded product, and a puncture needle 52 as a puncture body is embedded and fixed to a central axis of a lancet hub 50 made of synthetic resin having a rod shape. And the front-end | tip of the puncture needle 52 protrudes from the front-end | tip center of the lancet hub 50 toward the front.

Also, a spring seat 54 having an annular support protrusion that extends in the circumferential direction is formed at the rear end of the lancet hub 50. Further, a pair of guide projections 56, 56 projecting to both sides in the direction perpendicular to the axis are integrally formed on the outer peripheral surface of the rear end portion of the lancet hub 50. On the other hand, on the outer peripheral surface of the front end portion of the lancet hub 50, a pair of reuse prevention protrusions 58, 58 projecting to both sides in the direction perpendicular to the axis are integrally formed. Further, the pair of locking projections 60, 60 that are positioned axially rearward from the pair of reuse prevention projections 58, 58 by a predetermined dimension and project on both sides in the direction perpendicular to the axis on the outer peripheral surface of the lancet hub 50. Are integrally formed.

Here, the protruding direction of the pair of reuse preventing protrusions 58, 58 and the protruding direction of the pair of locking protrusions 60, 60 are different from each other. In particular, in this embodiment, the protruding direction of the pair of reuse preventing protrusions 58 and 58 and the protruding direction of the pair of locking protrusions 60 and 60 are different from each other by 90 degrees around the central axis. The protruding direction of the pair of reuse preventing protrusions 58, 58 is set in the same direction around the central axis as the protruding direction of the pair of guide protrusions 56, 56.

Furthermore, a needle cap 18 is provided on the tip side of the lancet hub 50. The needle cap 18 has a rod shape, and is integrally formed by extending from the tip of the lancet hub 50 on which the puncture needle 52 is protruded on the same central axis. A boundary portion between the lancet hub 50 and the needle cap 18 is a threaded portion 64 whose outer diameter is reduced in a constricted manner, and the needle cap 18 is twisted around the central axis with respect to the lancet hub 50 to form a threaded portion. The needle cap 18 can be manually detached from the lancet hub 50 by being detached at 64. The tip of the puncture needle 52 covered with the needle cap 18 can be exposed by removing the needle cap 18 from the lancet hub 50.

Further, as shown in FIG. 6, the tip portion of the needle cap 18 is a flat knob portion 66, and the rear end portion of the knob portion 66 has protrusions on both sides in the width direction. 68 and a tongue-like elastic claw portion 70 are formed so as to protrude in opposition to each other in the axial direction.

The lancet 14 is disposed on the central axis of the housing 12 with the rear end side of the lancet hub 50 inserted into the housing body 22 and the needle cap 18 inserted through the housing mouth 24. Are assembled. Further, when the lancet 14 is assembled to the housing 12, the compression coil spring 16 and the locking ring 72 are assembled and mounted in the housing 12.

That is, the compression coil spring 16 is housed in the bottom portion of the housing body 22 and is disposed on the central axis, and its rear end is fitted and positioned on the spring seat 26 of the housing body 22, and the front thereof The end is fitted into the spring seat 54 of the lancet hub 50. Thus, the compression coil spring 16 is interposed between the axially opposed surfaces of the bottom portion of the housing body 22 and the rear end portion of the lancet hub 50, and the lancet hub 50 is axially rearward (behind the housing body 22). ), The urging force accompanying the compression deformation is exerted in the direction of pushing the lancet hub 50 forward from the housing body 22.

On the other hand, as shown in FIGS. 6 to 9, the locking ring 72 is a resin molded product having a substantially circular ring shape, and is rotated by being inserted into the support cylinder portion 42 of the housing mouth body 24. It is installed as possible. Note that a pair of abutting leg portions 74 projecting forward are integrally formed on the locking ring 72, and the abutting leg portions 74 are connected adjacently on the support cylinder portion 42 on the circumference. It is inserted between the leg portions 40, 40. When the locking ring 72 rotates, the contact leg 74 abuts the connecting leg 40 in the circumferential direction, so that the locking ring 72 rotates in the circumferential direction on the support cylinder 42. The allowable range is set smaller than 45 degrees.

Further, an engaging portion 75 having an inner flange shape is integrally formed at the rear end portion of the locking ring 72, and a pair of first passage grooves 76 are formed on the inner peripheral surface of the engaging portion 75. , 76 and a pair of second passage grooves 78, 78 are formed so as to extend in parallel to the axial direction and are opposed to each other in the radial direction. The first passage grooves 76 and 76 and the second passage grooves 78 and 78 both extend linearly over the entire axial length of the engaging portion 75.

Furthermore, the inner diameter of the engaging portion 75 is slightly larger than the outer diameter of the lancet hub 50 and the needle cap 18, and the locking ring 72 is extrapolated to the lancet hub 50 and the needle cap 18. It is installed. The first passage groove 76 of the engagement portion 75 has a slightly larger cross-sectional shape than the reuse prevention protrusion 58 of the lancet hub 50, and the reuse prevention protrusion 58 is in the first passage groove 76. Can be moved in the axial direction. On the other hand, the second passage groove 78 of the engagement portion 75 has a slightly larger cross-sectional shape than the engagement protrusion 60 of the lancet hub 50, and the engagement protrusion 60 passes through the second passage groove 78. It is possible to move in the axial direction.

Further, in the locking ring 72, the angle (intersection angle) formed between the radial direction in which the pair of first passage grooves 76 and 76 face each other and the radial direction in which the pair of second passage grooves 78 and 78 face each other is determined in the lancet hub 50. The angle (intersection angle) formed by the radial direction in which the pair of reuse prevention protrusions 58 and 58 face each other and the radial direction in which the pair of locking protrusions 60 and 60 face each other is made different. In particular, in the present embodiment, the radial direction in which the pair of first passage grooves 76 and 76 face each other and the radial direction in which the pair of second passage grooves 78 and 78 face each other intersect each other at approximately 60 degrees. Yes.

As a result, as apparent from FIGS. 8 and 9, the pair of reuse preventing protrusions 58, 58 of the lancet hub 50 is engaged with the locking ring 72 while the lancet hub 50 is inserted into the locking ring 72. The pair of locking projections 60, 60 of the lancet hub 50 are engaged with the locking ring 72 at a circumferential relative position that is aligned with the pair of first passage grooves 76, 76 and allowed to pass in the axial direction. The pair of second passage grooves 78, 78 are in a misaligned state, and the locking projections 60, 60 are locked to the locking ring 72 to prevent the forward movement in the axial direction. Yes. On the other hand, in a state where the pair of locking projections 60, 60 of the lancet hub 50 are aligned with the pair of second passage grooves 78, 78 of the locking ring 72 and the passage in the axial direction is permitted, the lancet hub. 50 of the pair of reuse prevention protrusions 58, 58 are displaced with respect to the pair of first passage grooves 76, 76 of the locking ring 72, and the reuse prevention protrusions 58, 58 are in the locking ring 72. The lancet hub 50 is prevented from moving rearward in the axial direction with respect to the locking ring 72.

The pair of reuse prevention protrusions 58 and 58 and the pair of locking protrusions 60 and 60 in the lancet hub 50 are slightly larger than the thickness dimension of the engaging part 75 in the locking ring 72 in the central axis direction. A distance away. As a result, the reuse preventing projections 58, 58 are located on the front side in the axial direction of the engagement portion 75 and the locking projections 60, 60 are located on the rear side in the axial direction of the engagement portion 75. The locking ring 72 inserted on the lancet hub 50 can be rotated with respect to the lancet hub 50. Then, by the rotation of the locking ring 72, one of the pair of reuse preventing protrusions 58, 58 and the pair of locking protrusions 60, 60 is selectively set to the first passage grooves 76, 76. Alternatively, it can be positioned with respect to the second passage grooves 78 and 78 to allow passage displacement in the axial direction.

Further, a pair of pressing pieces 80, 80 are integrally formed on the outer peripheral surface of the locking ring 72 so as to protrude on both sides in the radial direction. The pressing piece 80 has an unequal right-angled triangular shape when viewed in the axial direction of the locking ring 72, and a surface corresponding to the oblique side thereof is a pressing inclined surface 82 inclined about the central axis of the locking ring 72. Has been. As shown in FIGS. 3 and 5, these pressing pieces 80, 80 are located inward of the operation piece 20 of the housing body 22 in a state where the locking ring 72 is attached to the support cylinder portion 42. Are aligned so that

In this way, the puncture device 10 of this embodiment is configured by incorporating the lancet 14 into the housing 12 together with the compression coil spring 16 and the locking ring 72. In the lancet 14 incorporated in the housing 12, guide protrusions 56 and 56 protruding from the lancet hub 50 are inserted into guide rails 30 and 30 as guide mechanisms for guiding the lancet 14 in the protruding direction. The movement of the lancet 14 in the axial direction is allowed in a state where rotation around the central axis, which is a circumferential displacement of the lancet 14 with respect to the housing 12, is prevented.

In the standard state as a product provided to the user, as shown in FIG. 4, the cap locking projections 47, 47 of the housing mouth body 24 are respectively formed with the projection 68 formed on the needle cap 18. The lancet 14 is attached to the housing 12 in a state where it is sandwiched and locked between the elastic claws 70 in the axial direction and the knob 66 of the needle cap 18 projects outward from the housing mouth 24 by a predetermined length. In contrast, it is positioned in the axial direction.

In such a standard state, as shown in FIG. 3, the lancet 14 compresses and deforms the compression coil spring 16 so that the locking projections 60, 60 of the lancet hub 50 are positioned further rearward than the locking ring 72. Until then, the housing body 22 is pushed into the back. In this state, as shown in FIG. 4, the reuse prevention protrusions 58, 58 of the lancet hub 50 support the first passage grooves 76, 76 of the locking ring 72 and the housing mouth body 24. Between the first guide grooves 44 and 44 of the tube portion 42, the tube portion 42 is positioned so as to straddle. That is, the first passage groove 76 of the locking ring 72 and the first guide groove 44 of the housing mouth body 24 are engaged by the reuse preventing projection 58, so that the locking ring 72 is brought into contact with the housing mouth body 24. On the other hand, an erroneous operation preventing mechanism is configured by being engaged in the circumferential direction so as not to be relatively rotatable.

Further, under this positioning state, as shown in FIG. 5, the pressing inclined surface 82 of the pressing piece 80 of the locking ring 72 is opposed to the inner side of the operation piece 20. Then, by pushing the operation piece 20 into the housing 12 with a finger, one end in the circumferential direction of the operation piece 20 is pressed against the pressing inclined surface 82, and the component force exerted according to the inclination angle of the pressing inclined surface 82 Based on the action, the pressing force of the operation piece 20 is applied to the locking ring 72 by being converted into a rotational force. However, in the standard state shown in FIGS. 3 and 4, since the rotation of the locking ring 72 relative to the housing 12 is prevented as described above, the puncture device 10 is expected even if the operation piece 20 is accidentally pressed. Without a puncture operation.

[Puncture preparation state]
Next, an operation for performing a puncturing operation using the puncture device 10 provided in the standard state as described above will be described. First, in the puncture device 10 in the standard state shown in FIGS. Is held with one hand, the needle cap 18 is picked with the other hand, and the needle cap 18 is rotated. As a result, the protrusion 68 and the elastic claw 70 of the needle cap 18 are separated from the cap locking protrusion 47 of the housing mouth body 24, and the needle cap 18 is threaded from the lancet hub 50 by the threaded portion 64. 18 is removed from the housing mouthpiece 24. By such an operation, the puncture device 10 is changed from the standard state to the puncture preparation state shown in FIGS.

In the puncture device 10 in the puncture preparation state, the lancet hub 50 is moved forward in the axial direction by the urging force of the compression coil spring 16 because the axial positioning of the needle cap 18 with respect to the housing mouth 24 is released. Moved. Then, the locking projection 60 of the lancet hub 50 comes into contact with the rear end surface of the engagement portion 75 of the locking ring 72 and is prevented from being displaced forward in the axial direction. Due to the locking action of the locking protrusion 60 on the locking ring 72, the lancet 14 is held at the puncture preparation position.

Further, when the lancet hub 50 is moved forward to this position, the reuse preventing projections 58 and 58 of the lancet hub 50 are moved forward from the engagement position of the locking ring 72 to the first passage grooves 76 and 76. And only the first guide grooves 44, 44 of the housing mouth body 24 are engaged and positioned.

Thus, in the puncture preparation state, the reuse prevention protrusions 58 and 58 and the locking protrusions 60 and 60 of the lancet hub 50 are connected to the first passage grooves 76 and 76 and the second passage grooves 78 and 60 of the locking ring 72. With respect to 78, the locking ring 72 is allowed to rotate within the housing 12 by being disengaged in the axially forward and backward directions.

[Puncture activation state]
Therefore, in order to change the puncture operation state from the puncture preparation state to the puncture operation state, as shown in FIG. 12, the puncture device 10 in the puncture preparation state is grasped and the operation piece 20 is pushed in with fingers. . As shown by a two-dot chain line in FIG. 12, the operating piece 20 is pushed in and pressed against the pressing inclined surface 82 of the locking ring 72, so that the locking ring 72 rotates relative to the housing 12 and the lancet 14 around the central axis. . 13 and 14, the second passage of the locking ring 72 with respect to the locking protrusions 60, 60 of the lancet hub 50 that has been in contact with the rear end surface of the locking ring 72, as shown in FIGS. When the grooves 78 and 78 are aligned, the axial displacement prevention force by the locking ring 72 of the locking protrusions 60 and 60 is released, and the locking protrusions 60 and 60 pass the second passage of the locking ring 72. A forward axial displacement through the grooves 78, 78 is allowed.

As a result, as shown in FIGS. 15 and 16, the lancet 14 moves vigorously forward in the axial direction in the housing 12 based on the biasing force of the compression coil spring 16. The lancet 14 moves forward in the axial direction until the guide projections 56, 56 of the lancet 14 abut against the rear end surface of the locking ring 72, so that the distal end side of the lancet 14 guides the locking ring 72 from the guide projections 56, 56. While penetrating, the puncture needle 52 at the tip of the lancet 14 protrudes outward from the tip opening of the housing mouth 24 by a predetermined length, and the puncture operation is realized.

[After puncture]
In the above puncturing operation, the lancet 14 moves forward in the axial direction beyond the free length of the compression coil spring 16 by the urging force of the compression coil spring 16. At that time, since both end portions in the axial direction of the compression coil spring 16 are fixed to the bottom portion of the housing body 22 and the rear end portion of the lancet 14, at the time of puncture when the puncture needle 52 protrudes from the housing mouth 24. The restoring force of the compression coil spring 16 is exerted on the lancet 14 in the direction of pulling back into the housing 12.

As a result, the puncture operation in which the puncture needle 52 protrudes from the housing mouth 24 is instantaneously performed, and after the puncture, the lancet 14 is quickly pulled back into the housing 12 as shown in FIGS. Thus, the needle tip of the puncture needle 52 is housed in the housing mouthpiece 24.

[Reuse prevention]
After puncturing as described above, the lancet 14 is held at the axial position positioned by the compression coil spring 16 having a free length as shown in FIGS. Further, the locking ring 72 rotated by the operation piece 20 is also left in the position after the rotation as shown in FIGS. That is, after the puncture, the locking ring 72 is not applied with a rotational force and is kept in the unlocked position, so that even if the lancet 14 is pushed into the back of the housing 12, the locking protrusion The part 60 only moves in the second passage groove 78, and the locking projection 60 is not locked to the locking ring 72. Therefore, even if the operation piece 20 is operated after puncturing, the puncturing operation in which the lancet 14 protrudes forward in the axial direction is not reproduced.

In addition, even after a puncture, even if a wire rod or the like is inserted from the front opening of the housing 12 and the lancet 14 is pushed into the interior of the housing 12 to try to reuse it, as shown in FIGS. Furthermore, the relative positions in the circumferential direction of the reuse prevention protrusions 58, 58 and the locking protrusions 60, 60 in the lancet 14 are the first passage grooves 76, 76 and the second passage grooves 78, 78 in the locking ring 72. Therefore, the reuse can be prevented more reliably.

That is, when the lancet 14 is forcibly pushed into the back of the housing 12, the locking projections 60, 60 of the lancet 14 can be aligned with the second passage grooves 78, 78 in the circumferential direction. Even if the stop protrusions 60, 60 can be moved deeper than the locking ring 72, the reuse prevention protrusions 58, 58 are already displaced with respect to the first passage grooves 76, 76 at that time. Yes. Therefore, as shown in FIGS. 19 and 20, when the lancet 14 is pushed further from there, the reuse prevention protrusions 58 and 58 come into contact with the front end surface of the engagement portion 75 of the locking ring 72, The locking ring 72 is also moved to the back of the housing 12 together with the lancet 14, and the lancet 14 is locked again with respect to the locking ring 72 so as to be ready for puncture as shown in FIGS. It is virtually impossible.

In particular, in the present embodiment, the locking ring 72 is positioned in the depth direction of the housing mouth body 24, has a larger diameter than the support cylinder portion 42 of the housing mouth body 24, and is externally arranged on the support cylinder portion 42. Yes. Therefore, even when looking through the front opening of the housing mouth body 24, the locking ring 72 can hardly be visually recognized. Therefore, the lancet 14 is pushed through the small front opening of the housing mouth body 24 and simultaneously locked. It is substantially impossible to rotationally displace the ring 72.

Further, since the lancet 14 is prevented from rotating around the central axis with respect to the housing 12 by the engaging action of the guide protrusions 56, 56 to the guide rails 30, 30, the lancet 14 is rotated to rotate the locking ring 72. It is also impossible to exert a relative rotational action on the. In addition, as described above, since the locking ring 72 is allowed to move inward of the housing main body 22, the locking ring 72 will be rotated by a wire inserted from the front opening of the housing mouth 24. Even so, it is even difficult to obtain an axial contact reaction force with respect to the locking ring 72 such as a wire rod.

[Ii] Specific Structure and Operation of Restricting Means in Disposable Puncture Device In this embodiment, in order to restrict the rotation of the locking ring 72 that is not based on the operation of the operation piece 20 in the puncture preparation state, the following structure is provided. The regulation means is adopted. The housing opening 24 in the present embodiment will be described in detail with reference to FIG. 21, and the locking ring 72 in the present embodiment will be described in detail with reference to FIG.

The housing mouth body 24 of the present embodiment is provided with an inner peripheral convex portion 84 extending in the axial direction between the connecting leg portions 40 and 40 on the outer peripheral surface of the support cylinder portion 42. A pair of the inner peripheral convex portions 84 are provided on both sides in the radial direction on the outer peripheral surface of the support cylinder portion 42. In particular, in this embodiment, each inner peripheral convex part 84 is separated from the end convex part 84a adjacent to the connecting leg part 40 in the circumferential direction from the end convex part 84a. It is comprised from the center convex part 84b located in the center of the circumferential direction between. Thus, a concave portion 86 that is relatively concave with respect to both the convex portions 84a and 84b is formed between the circumferential direction of the end-side convex portion 84a and the central convex portion 84b. The central protrusions 84b each have a substantially semicircular cross section, and the outer peripheral surface is curved. Further, in the end-side convex portion 84a, the outer peripheral surface of the portion adjacent to the connecting leg portion 40 has a substantially flat surface shape, while the outer peripheral surface on the central convex portion 84b side has a curved surface shape. Furthermore, on the outer peripheral surface of the support cylinder part 42, no irregularities are provided on the opposite side of the end convex part 84a with respect to the central convex part 84b, and the outer peripheral surface of the support cylinder part 42 spreads smoothly. Yes.

Further, the locking ring 72 of the present embodiment is provided with an outer peripheral convex portion 88 extending in the axial direction on the inner peripheral surface thereof. The outer peripheral convex portion 88 is provided over substantially the entire axial length of the locking ring 72 at the substantially center in the circumferential direction of the contact leg portion 74 of the locking ring 72. In the present embodiment, since the pair of contact leg portions 74 and 74 are provided at positions that oppose each other in the radial direction, a pair of outer peripheral convex portions 88 are also provided opposite to each other in the radial direction. The outer peripheral convex portion 88 also has a substantially semicircular cross section, and the inner peripheral surface has a curved surface shape.

The housing mouth body 24 and the locking ring 72 are assembled as shown in FIGS. 23 and 24 in the standard state. That is, the contact leg portions 74 and 74 of the locking ring 72 are inserted between the connecting leg portions 40 and 40 of the housing mouth body 24 in the circumferential direction, and the locking ring 72 is provided on the housing mouth body 24. It is inserted in the support cylinder part 42, and is supported so that rotation is possible.

Here, in the standard state, a concave portion formed between the end-side convex portions 84a and 84a and the central convex portions 84b and 84b in the inner peripheral-side convex portions 84 and 84 provided on the outer peripheral surface of the support cylinder portion 42. The outer peripheral side convex portions 88 and 88 provided on the inner peripheral surface of the locking ring 72 enter the 86 and 86. That is, the inner peripheral convex portions 84 and 84 and the outer peripheral convex portions 88 and 88 are formed at corresponding positions of the support cylinder portion 42 and the locking ring 72, and the inner peripheral convex portion 84, 84 and the outer peripheral side convex parts 88 and 88 are each formed in the circumferential direction at equal intervals. Note that the inner peripheral convex portion 84 (the end convex portion 84a and the central convex portion 84b) provided on the outer peripheral surface of the support cylinder portion 42 is the inner peripheral surface (outer peripheral side) of the contact leg portion 74 in the locking ring 72. The portion where the convex portion 88 is not provided) abuts with substantially zero touch or faces with a slight separation distance. On the other hand, does the outer peripheral convex portion 88 provided on the inner peripheral surface of the contact leg portion 74 contact the outer peripheral surface of the support cylinder portion 42 (the portion where the inner peripheral convex portion 84 is not provided) with substantially zero touch? Opposite with a slight separation.

From such a standard state, the needle cap 18 provided at the tip of the lancet 14 is twisted into a puncture preparation state, thereby allowing the locking ring 72 to rotate with respect to the support cylinder portion 42. In this embodiment, the locking ring 72 is positioned in the circumferential direction with respect to the support cylinder 42 even in a state where the rotation of the locking ring 72 is allowed with respect to the support cylinder 42. That is, the outer peripheral convex portions 88 and 88 and the inner peripheral convex portions 84 and 84, particularly the central convex portions 84b and 84b, come into contact with each other in a state where the rotation of the locking ring 72 is allowed. Thus, the free rotation of the locking ring 72 with respect to the support cylinder portion 42 is restricted. Furthermore, not only in the puncture preparation state, but also in the operation process of twisting the needle cap 18 provided at the tip of the lancet 14 to change from the standard state to the puncture preparation state, the force to twist the needle cap 18 is locked. By being transmitted to the ring 72, it is possible to prevent the locking ring 72 from rotating in the circumferential direction with respect to the support cylinder portion 42.

Therefore, in this embodiment, the inner peripheral side convex portions 84 and 84 and the outer peripheral side convex portions 88 and 88 provided between the support cylinder portion 42 (housing mouth body 24) and the locking ring 72 in the radial direction are: The abutting portions that generate resistance are brought into contact with each other when the locking ring 72 is rotated with respect to the support cylinder portion 42. That is, by providing the contact portion, a resistance is exerted when the locking ring 72 is rotated in a state where the locking ring 72 is allowed to rotate, and the operation piece (operation member) 20 is operated. Since the rotation of the locking ring 72 that is not based on this is regulated, in this embodiment, the abutting portion constitutes a regulating means.

Then, as the puncture operation is performed, the operation piece 20 is pushed in and an external force is applied to the pressing inclined surface 82, so that the outer peripheral convex portions 88, 88 are centered on the inner peripheral convex portions 84, 84 as shown in FIG. The locking ring 72 is allowed to rotate with respect to the support cylinder portion 42 over the convex portions 84b and 84b. The overhanging of the central convex portions 84b, 84b by the outer peripheral side convex portions 88, 88 can be achieved by, for example, the contact leg portions 74, 74 of the locking ring 72 being bent and deformed to the outer peripheral side. As a result, the axial displacement preventing force between the locking ring 72 and the locking projections 60, 60 of the lancet hub 50 is released, and the locking projections 60, 60 can be allowed to move forward in the axial direction. . As a result, the lancet 14 moves vigorously forward in the axial direction in the housing 12 based on the urging force of the compression coil spring 16, and the puncturing operation is realized.

In the disposable puncture device 10 of the present embodiment configured as described above, when the needle cap 18 is pulled out to be in a puncture preparation state, the locking ring 72 is allowed to rotate. In FIG. 3, the rotation of the locking ring 72 is resisted, so that the rotation of the locking ring 72 that is not based on the operation of the operation piece 20 is restricted. Thereby, it can be avoided that the locking ring 72 rotates unintentionally with respect to the support cylinder portion 42 before the operation piece 20 is operated and the lancet 14 moves forward in the axial direction.

In particular, the restricting means for restricting the rotation of the locking ring 72 is constituted by the inner peripheral convex portions 84 and 84 and the outer peripheral convex portions 88 and 88. While restricted by the contact between the central convex portions 84b, 84b of the side convex portions 84, 84 and the outer peripheral convex portions 88, 88, the outer peripheral convex portions 88, 88 are allowed to pass over the central convex portions 84b, 84b. Has been. That is, when the locking ring 72 is rotated, for example, the locking ring 72 and the lancet 14 do not move in the axial direction. It is suppressed and the lancet 14 is prevented from shaking.

In addition, after the outer peripheral convex portions 88, 88 have passed over the central convex portions 84b, 84b, since no irregularities are provided, the outer peripheral convex portions 88, 88 are zero-touched on the outer peripheral surface of the support cylinder portion 42 or The locking ring 72 is rotated with respect to the support cylinder portion 42 in a state of facing slightly spaced apart. Therefore, after the outer peripheral convex portions 88 and 88 have passed over the central convex portions 84b and 84b, the locking ring 72 is smoothly rotated without the user feeling a sense of resistance such as a catching feeling. Can be operated.

[Iii] Disposable Puncture Device as Second Embodiment Next, a disposable puncture device employing another structure of a locking ring is illustrated as a second embodiment of the present invention in FIGS. In addition, in the following description, about the member and site | part made into the structure similar to 1st Embodiment, respectively, attaching | subjecting the same code | symbol as 1st Embodiment in a figure, those detailed description is given. Omitted.

The puncture device 100 of the present embodiment is shown in an exploded view in FIG. 29, and a standard state provided as a product to the user in the market is shown in FIGS. Compared to the form, the pair of reuse prevention protrusions (58, 58) provided on the lancet hub 50 is not provided. In this embodiment, a pair of rotation prevention protrusions 102 and 102 are formed at substantially the same position as the pair of reuse prevention protrusions (58, 58) in the first embodiment.

Correspondingly, the shape of the engaging portion 75 in the locking ring 72 is different from that of the first embodiment. Specifically, a pair of cutout portions 104, 104 extending substantially ¼ circumference are formed in the inner flange-like engagement portion 75 so as to face each other in the radial direction. It should be noted that a pair of cutout portions 106, 106 partially cut away in thickness are formed on the rear end surface of the engagement portion 75 of the locking ring 72 so as to face each other in the radial direction. A pressing inclined surface 82 is constituted by the step surface on the boundary line of the cutout portion 106 located at the rear end surface of the engaging portion 75 of the locking ring 72. That is, instead of the pressing pieces 80 and 80 projecting on the outer peripheral surface of the locking ring 72 in the first embodiment, in the present embodiment, the cutout portions 106 and 106 are provided. The component of the pushing force of the operating piece 20 provided on the housing 12 is exerted as a rotational force on the locking ring 72 by the pressing inclined surface 82 constituted by the step surface on the boundary line 106. It is.

26 to 28, in a state where the lancet 14 is positioned in the axial direction with respect to the housing 12 by the locking of the needle cap 18 to the housing mouth 24, the locking projection 60 Is positioned away from the rear end surface of the engaging portion 75 in the axial direction, while the rotation prevention protrusions 102 and 102 are positioned in the engaging portions 75 and 75 as shown in FIG. is doing. Under such a state, both end portions in the circumferential direction of each rotation preventing projection 102 are opposed to the circumferential end surface of each notch portion 104 around the central axis. Thereby, when the locking ring 72 rotates around the central axis, the rotation preventing protrusion 102 of the lancet 14 comes into contact with the notch 104 of the engaging portion 75. Further, the guide projections 56 and 56 of the lancet 14 are inserted into the guide rails 30 and 30 of the housing main body 22 to prevent rotation around the central axis. Therefore, in the standard state, the contact of the rotation prevention protrusions 102 and 102 with the notches 104 and 104 and the guide protrusions 56 and 56 are inserted into the guide rails 30 and 30 so that the rotation around the central axis is prevented. By the prevention mechanism, the rotation of the locking ring 72 is prevented by the engaging action to the housing 12 via the lancet 14.

Next, in order to perform a puncturing operation using the puncture device 100 provided in the standard state as described above, the needle cap 18 is threaded from the lancet hub 50 and extracted from the housing mouth 24 as in the first embodiment. Thus, the puncture preparation state as shown in FIGS. In the puncture device 100 in the puncture preparation state, as in the first embodiment, the positioning of the lancet hub 50 by the needle cap 18 is released, and the lancet hub 50 is moved forward in the axial direction by the urging force of the compression coil spring 16. It is moved, and the locking projections 60, 60 of the lancet hub 50 are in contact with the rear end surface of the engaging portion 75 of the locking ring 72.

In addition, when the lancet hub 50 is moved forward to this position, the rotation prevention protrusions 102 and 102 of the lancet hub 50 are disengaged forward from the engaging portion 75 of the locking ring 72, thereby the locking ring. 72 is allowed to rotate within the housing 12.

Therefore, in such a puncture preparation state, when the operating piece 20 is pushed inward of the housing 12 as in the first embodiment, the operating piece 20 is pressed against the pressing inclined surface 82 of the locking ring 72, so that The locking ring 72 is rotated with respect to the housing 12 and the lancet 14 about the central axis by the component force. As a result, as shown in FIGS. 33 to 35, the locking protrusions 60, 60 of the lancet hub 50 that are in contact with the rear end surface of the engaging portion 75 of the locking ring 72 are When aligned with the notches 104, 104, the axial displacement blocking force exerted on the lancet hub 50 is released, and the locking projections 60, 60 connect the notches 104, 104 of the locking ring 72. Displacement is allowed axially forward through.

As a result, as shown in FIG. 36, the lancet 14 moves vigorously forward in the axial direction in the housing 12 based on the urging force of the compression coil spring 16, and the puncture needle 52 as in the first embodiment. The puncture operation is realized by momentarily protruding from the front opening of the housing 12. In the present embodiment, a plurality of positioning ribs 108 are provided on the inner peripheral surface of the cylindrical portion of the housing body 22 so as to extend in the axial direction on the bottom side where the compression coil spring 16 is disposed. . The plurality of positioning ribs 108 allow the compression coil spring 16 to be expanded and deformed in a stable position on the central axis in the housing body 22.

Further, as shown in FIG. 37, after the puncture in which the needle tip of the puncture needle 52 is housed in the housing mouth 24, the locking ring 72 rotated by the operation piece 20 is formed as shown in FIGS. The position after rotation as shown in FIG. Therefore, after the puncture, as shown in FIGS. 38 and 39, even if the lancet 14 is forced to be reused by pushing it into the back of the housing 12, the locking projections 60, The lancet 14 is again locked with respect to the locking ring 72 and the puncture as shown in FIGS. 30 to 32 is performed simply by moving 60 through the notches 104 and 104 of the locking ring 72 to the back of the housing body 22. It is virtually impossible to get ready.

In particular, in the present embodiment, since the rotation of the lancet 14 around the central axis with respect to the housing 12 is prevented by the guide protrusions 56 and 56 being inserted into the guide rails 30 and 30, the pushed lancet 14 is rotated. It cannot be locked to the locking ring 72. Therefore, in order to return to the puncture preparation state after the puncture, it is necessary to rotate and disengage the locking ring 72 at the same time while pushing the lancet 14 through the small front opening of the housing mouth 24. Use is becoming more difficult.

Also in this embodiment, the same restricting means as described in the above [ii] column is employed, and the restricting means prevents inadvertent rotation of the locking ring 72 in the puncture preparation state. Thus, the unintentional lancet 14 is prevented from being released and displaced in the projecting direction, and the locking ring 72 is forced beyond the restriction by the restricting means during the puncturing operation by the pushing operation of the operation piece 20. As a result, the target puncture operation is realized.

[Iv] Disposable Puncture Device as Third Embodiment Next, a disposable puncture device according to a third embodiment of the present invention will be described with reference to FIGS. Note that members other than the housing mouth body 120 and the locking ring 122 in the present embodiment may have the same structure as in the first embodiment, and thus detailed description thereof is omitted. That is, in this embodiment, the housing mouth body 120 shown in FIGS. 40 and 41 and the locking ring 122 shown in FIGS. 42 and 43 are employed.

That is, the housing mouth body 120 of the present embodiment is provided with an outer peripheral protrusion 124 that protrudes toward the outer peripheral side and extends in the peripheral direction between the connecting leg portions 40 and 40 on the outer peripheral surface of the support cylindrical portion 42. Yes. The outer peripheral projections 124 are provided adjacent to one connecting leg 40 between the connecting legs 40 and 40 in the circumferential direction, and a pair is provided on both sides in the radial direction on the outer peripheral surface of the support cylinder 42. It has been. In the present embodiment, the outer peripheral projection 124 has a predetermined axial dimension (vertical dimension in FIGS. 40 and 41) and 1 in the circumferential distance between the connecting legs 40 and 40. It is formed with a circumferential dimension of about / 3.

And in the axial direction rear surface (upper surface in FIG. 40, 41) in these outer periphery protrusions 124, 124, it is an axial dimension toward the side which is not adjacent from the side adjacent to the connection leg part 40 in the circumferential direction. In the present embodiment, substantially the entire rear surface in the axial direction of the outer peripheral projections 124 and 124 is the inclined surfaces 126 and 126.

On the other hand, in the locking ring 122 of the present embodiment, the front surfaces in the axial direction of the contact legs 74, 74 are provided with inclined surfaces 128, 128 whose axial dimension decreases from one to the other in the circumferential direction. In particular, in this embodiment, substantially the entire axial front surfaces of the contact legs 74, 74 are inclined surfaces 128, 128.

The housing mouth body 120 and the locking ring 122 having such a structure are assembled as shown in FIG. 44 in the standard state. That is, the contact leg portions 74 and 74 extending from the locking ring 122 are inserted between the connecting leg portions 40 and 40 of the housing mouth body 120, and the locking ring 122 is extrapolated to the support cylinder portion 42. Here, the inclined surfaces 126 and 126 provided on the housing mouth 120 and the inclined surfaces 128 and 128 provided on the locking ring 122 are formed with substantially the same inclination angle. In the standard state, these inclined surfaces 126 are provided. 128 are in contact with each other or opposed in the axial direction with a slight separation distance. Therefore, in the present embodiment, the axially opposed surfaces that oppose the axially front surfaces (inclined surfaces 128, 128) of the locking ring 122 are constituted by the inclined surfaces 126, 126 provided on the housing mouth body 120. .

From this standard state, the needle cap (18) provided at the tip of the lancet (14) is twisted into a puncture preparation state, but in this embodiment, the puncture preparation state is established and the support tube portion 42 is made. Even when the locking ring 122 is allowed to rotate, the inclined surfaces 126 and 126 of the outer peripheral projections 124 and 124 provided on the housing mouth 120 and the inclined surface provided on the locking ring 122. The free rotation of the locking ring 122 with respect to the support cylinder portion 42 is restricted by the contact between 128 and 128.

That is, in the present embodiment, when the locking ring 122 is rotated, the abutting portions that abut against the inclined surfaces 128 and 128 that are the front surfaces in the axial direction of the locking ring 122 to generate resistance are the housing openings. The outer peripheral projections 124 and 124 provided on the body 120 are constituted by inclined surfaces 126 and 126. Thus, the contact portion is provided on the axially opposed surfaces (inclined surfaces 126 and 126) that oppose the inclined surfaces 128 and 128 that are the front surfaces in the axial direction of the locking ring 122. Then, under the state where the rotation of the locking ring 122 is allowed by the contact portion, a resistance is exerted when the locking ring 122 is rotated, and based on the operation of the operation piece (operation member) (20). Since the rotation of the non-engagement locking ring 122 is restricted, in this embodiment, the contact means constitutes a restricting means.

As the puncturing operation is performed, the operating piece (20) is pushed in and an external force is applied to the pressing inclined surface 82, whereby the inclined surfaces 128, 128 provided on the locking ring 122 are moved into the housing opening as shown in FIG. Over the inclined surfaces 126 and 126 provided on the body 120, the rotation of the locking ring 122 with respect to the support tube portion 42 is allowed. The climbing over the inclined surfaces 126, 126 by the inclined surfaces 128, 128 causes the inclined surfaces 126, 126 and the inclined surfaces 128, 128 to contact each other as the operating piece 20 is pushed in, and the component force of the contact force is related. The locking ring 122 and the lancet (14) are moved in the axially rearward direction against the urging force of the compression coil spring (16) by acting as a pushing force in the axially backward direction of the retaining ring 122. . The inclined surfaces 128, 128 get over the inclined surfaces 126, 126 to allow the locking ring 122 to rotate with respect to the support cylinder 42, and to lock the locking ring 122 and the lancet hub (50). The axial displacement prevention force with respect to the portion (60, 60) is released, and the axial displacement of the locking projection (60, 60) can be allowed. As a result, the lancet (14) moves vigorously forward in the axial direction within the housing (12) based on the urging force of the compression coil spring (16), thereby realizing the puncturing operation.

Also in the disposable puncture device of the present embodiment having the above-described structure, the locking ring 122 is intended for the support cylinder portion 42 before the operation piece (20) is operated, as in the first embodiment. It can be avoided that the lancet (14) moves forward in the axial direction without rotating. In particular, in the present embodiment, when the locking ring 122 is rotated, the locking ring 122 and the lancet (14) are merely moved rearward in the axial direction and are not displaced in the direction perpendicular to the axis. The shake of the lancet (14) can be effectively reduced.

[V] Disposable Puncture Device as Fourth Embodiment Next, a disposable puncture device according to a fourth embodiment of the present invention will be described with reference to FIGS. Note that members other than the locking ring 130 and the lancet 132 in the present embodiment may have the same structure as in the first embodiment, and thus detailed description thereof is omitted. That is, in this embodiment, the locking ring 130 shown in FIGS. 46 and 47 and the lancet 132 shown in FIGS. 48 and 49 are employed.

The locking ring 130 in the present embodiment is provided with an axial convex portion 136 that protrudes rearward in the axial direction on the axial rear end surface 135 of the engaging portion 134 that is an axially rear surface. In the present embodiment, on the axial rear end surface 135 of the engaging portion 134, the pair of axial convex portions 136, 136 are perpendicular to each other at positions substantially adjacent to the second passage grooves 78, 78 in the radial direction. It extends in the direction.

On the other hand, in the lancet 132 in the present embodiment, the locking projections 138, 138 are formed with a stepped shape. That is, the locking protrusions 138, 138 are located on the inner peripheral side and have a wide circumferential portion 140, 140 having a large circumferential dimension, and the narrow portions 142, 142 projecting from the circumferential center of the wide width portion 140 to the outer peripheral side. It is composed of

Then, the locking ring 130, the lancet 132, and the housing mouth body 24 are assembled. That is, in the standard state, the locking protrusions 138 and 138 of the lancet 132, in particular, the narrow portions 142 and 142 in the axial direction contact the engaging portion 134 of the locking ring 130 in the axial direction. The narrow protrusions 142 and 142 of the locking projections 138 and 138 of the lancet 132 are in contact with the axial projections 136 and 136 in the circumferential direction or opposed in the circumferential direction with a slight separation distance.

From this standard state, the needle cap (18) provided at the tip of the lancet 132 is twisted into a puncture preparation state. In this embodiment, as shown in FIGS. Even in a state where the rotation of the locking ring 130 is allowed with respect to the support cylinder portion 42, the axial protrusions 136, 136 provided on the locking ring 130 and the engagement provided on the lancet 132. The stop protrusions 138, 138, in particular, the narrow portions 142, 142 abut against each other, thereby resisting the rotation of the locking ring 130 relative to the support cylinder 42, and the locking ring 130 can be freely rotated. It is regulated.

In other words, in the present embodiment, when the locking ring 130 is rotated, the abutting portions that generate a resistance by abutting against the locking protrusions 138 and 138 of the lancet 132 are located behind the locking ring 130 in the axial direction. It is comprised by the axial direction convex parts 136 and 136 provided in the direction (axial direction rear end surface 135). Then, under the state where the rotation of the locking ring 130 is allowed by the contact portion, a resistance is exerted when the locking ring 130 is rotated, and based on the operation of the operation piece (operation member) (20). Since the rotation of the non-engagement locking ring 130 is restricted, in this embodiment, the contact means constitutes a restricting means.

In the axial direction in which the locking protrusions 138 and 138 provided on the lancet 132 are provided on the locking ring 130 by pushing the operating piece (20) and applying an external force to the pressing inclined surface 82 with the puncturing operation. Overcoming the convex portions 136 and 136 (escape), the rotation of the locking ring 130 with respect to the support tube portion 42 is allowed. The overhanging of the axial projections 136, 136 by the locking projections 138, 138 causes the locking projections 138, 138 and the axial projections 136, 136 to contact each other as the operating piece 20 is pushed in, The abutting force is applied as a pushing force of the lancet 132 in the axially rearward direction, and the lancet 132 is moved in the axially backward direction against the urging force of the compression coil spring (16). Then, when the locking protrusions 138 and 138 get over the axial projections 136 and 136, the rotation of the locking ring 130 with respect to the support cylinder 42 is allowed, and the locking ring 130 and the lancet 132 are locked. The axial displacement prevention force with the protrusions 138 and 138 is released, and the axial displacement of the locking protrusions 138 and 138 can be allowed. As a result, the lancet 132 moves vigorously forward in the axial direction in the housing (12) based on the urging force of the compression coil spring (16), thereby realizing the puncturing operation.

Also in the disposable puncture device of the present embodiment having the above-described structure, the locking ring 122 is intended for the support cylinder portion 42 before the operation piece (20) is operated, as in the first embodiment. It can be avoided that the lancet (14) moves forward in the axial direction without rotating. Also in this embodiment, when the locking ring 130 is rotated, the lancet 132 only moves rearward in the axial direction and does not deviate in the direction perpendicular to the axial direction. It can be effectively reduced.

The embodiment of the present invention has been described in detail above. However, this is merely an example, and the present invention is not construed as being limited to any specific description of the embodiment.

That is, in each of the disposable puncture devices 10 and 100 of the above-described embodiment, only one compression coil spring 16 is provided in the housing 12 that exerts both a projecting output and a pulling force on the lancets 14 and 132. However, for example, a spring member that exerts an urging force in the protruding direction on the lancets 14 and 132 and a spring member that exerts an urging force in the retracting direction may be provided separately.

Further, as the puncture body, a blade or the like can be used instead of the puncture needle 52 as illustrated.

Further, in the first embodiment, the outer peripheral side convex portions 84, 84 are provided on the outer peripheral surface of the support cylinder portion 42 of the housing mouth body 24, and the outer peripheral side convex portions 88, 84 are provided on the inner peripheral surface of the locking ring 72. Although the contact portion is configured by the inner peripheral side convex portions 84 and 84 and the outer peripheral side convex portions 88 and 88, the present invention is not limited to such a mode. In other words, a convex portion is provided on one of the outer peripheral surface of the support cylinder portion 42 and the inner peripheral surface of the locking ring 72, and a concave portion is provided on the other side. A restricting means for restricting the rotation of the locking ring 72 not based on the operation of the (operation piece 20) may be configured.

In the first embodiment, the end convex portions 84a and 84a in the inner peripheral convex portions 84 and 84 are not essential. That is, the locking ring 72 only needs to be restricted from rotating in the direction in which the locking protrusion 60 is unlocked, and the rotation in the opposite direction is not necessarily restricted. However, the rotation of the locking ring 72 in the opposite direction can be restricted by the contact leg portion 74 coming into contact with the connecting leg portion 40.

In the first, third, and fourth embodiments, the contact portions (inner peripheral side convex portion 84 and outer peripheral side convex portion 88, inclined surface 126, axial convex portion 136) are opposed to each other in the radial direction. Although provided, it may be provided only at one place on the circumference, or may be provided at three or more places. In the case where a plurality of such contact portions are provided, it is preferable that they are provided at equal intervals in the circumferential direction, but they are not necessarily provided at equal intervals.

Furthermore, in the first, third, and fourth embodiments, the inner peripheral surface, the axial front surface (inclined surface 128), and the axial rear surface (axial rear end surface 135) of the locking rings 72, 122, and 130, respectively. However, two or three of them may be used in combination with each other, for example, against the inner peripheral surface of the locking rings 72, 122, and 130 and the front surface in the axial direction. A contact portion may be provided, or a contact portion may be provided on all of the inner peripheral surface, the axial front surface, and the axial rear surface of the locking rings 72, 122, and 130.

Furthermore, in the first, third, and fourth embodiments, the restricting means for restricting the rotation of the locking rings 72, 122, and 130 not based on the operation of the operation member (operation piece 20) has the contact portion (inner circumference). Although it was comprised by the side convex part 84, the outer peripheral side convex part 88, the inclined surface 126, and the axial direction convex part 136), it is not limited to this aspect. That is, an urging member that urges the locking rings 72, 122, and 130 in the direction opposite to the rotation direction is provided, and the urging force of the urging member resists the rotation of the locking rings 72, 122, and 130. Therefore, a restricting means for restricting the rotation of the locking rings 72, 122, and 130 not based on the operation of the operation member may be provided. In the case where such a restricting means is provided, an operating force exceeding the urging force is exerted on the operating member, so that the locking rings 72, 122, and 130 are rotated while swinging the urging force by the urging member. Such an urging member may be provided on any of the locking rings 72, 122, 130, the lancets 14, 132, the housing mouths 24, 120, the housing body 22, and the like.

In the puncture device 10 of the first embodiment, an erroneous operation prevention mechanism (the first passage groove 76 of the locking ring 72 and the first guide groove 44 of the housing mouth body 24 and the reuse prevention protrusion 58 of the lancet hub 50). ) Prevents the locking ring 72 from rotating in the standard state or when the needle cap 18 is threaded, but is provided with restricting means (inner peripheral convex portion provided separately from the erroneous operation preventing mechanism). 84, 84 and the outer peripheral projections 88, 88) can also exert the effect of preventing the rotation of the locking ring 72 in the standard state or when the needle cap 18 is threaded. In the second and third embodiments, the effect of preventing the rotation of the locking rings 72 and 122 in the standard state and when the needle cap 18 is threaded is exhibited by the restricting means provided separately from the erroneous operation preventing mechanism. Can be done. However, the restricting means according to the present invention is only required to exhibit the effect of preventing the rotation of the locking ring at least in the puncture preparation state (that is, in a state where the rotation of the locking ring 72 is allowed). Further, it is not necessary to exert the rotation preventing effect when the needle cap 18 is threaded.

10, 100: Disposable puncture device, 12: Housing, 14, 132: Lancet, 16: Compression coil spring (spring member), 20: Operation piece (operation member), 22: Housing body, 24, 120: Housing mouth , 42: support cylinder part, 52: puncture needle (puncture body), 60, 138: locking projection, 72, 122, 130: locking ring, 84: inner peripheral convex part (contact part), 88: Outer peripheral convex portion (contact portion), 126: inclined surface (axially opposed surface, contact portion), 128: inclined surface (axially front surface), 135: axial rear end surface (axially rear surface), 136 : Axial convex part (contact part)

Claims (9)

1. In a disposable puncture device in which a lancet accommodated in a housing is urged by a spring member, and a puncture body provided at the tip of the lancet projects from the housing, the puncture operation is performed.
   A locking ring is disposed in the housing, and the lancet penetrates the locking ring and can be displaced in a protruding direction.
   A locking projection is provided on the lancet, and the spring member is compressed and deformed by the locking action of the locking projection on the locking ring, and the lancet is held at the puncture preparation position at the back of the housing. While it is supposed to be
   There is provided an operating member for releasing the locking of the locking protrusion to the locking ring by rotating the locking ring and displacing the lancet in the protruding direction by the spring member to perform a puncturing operation. In addition,
   In a state where the rotation of the locking ring is allowed, a restricting means for restricting the rotation of the locking ring that is not based on the operation of the operation member by exerting a resistance to the rotation of the locking ring. Disposable puncture device characterized by being provided.
2. An abutting portion that generates resistance due to mutual abutment is provided on the inner and outer peripheral surfaces of the locking ring and the housing that rotatably supports the locking ring in the radial direction. The disposable puncture device according to claim 1, wherein the restriction means is configured by.
3. The housing includes a housing main body and a housing mouth provided on the distal end side of the housing main body, and the housing mouth is provided with a support cylinder portion extending toward the proximal end side, The disposable according to claim 2, wherein the locking ring is extrapolated with respect to the support cylinder and the abutting portion is provided between the support cylinder and the locking ring in a radial direction. Type puncture device.
4. An inner peripheral convex portion extending in the axial direction is provided on the outer peripheral surface of the support cylinder portion, and an outer peripheral convex portion extending in the axial direction is provided on the inner peripheral surface of the locking ring. During the relative rotation of the ring with respect to the support cylinder in the circumferential direction, the inner peripheral convex portion and the outer peripheral convex portion are in contact with each other, thereby resisting the rotation of the locking ring with respect to the housing. The contact portion that allows the locking ring to rotate based on the operation of the operation member is configured by the inner peripheral convex portion and the outer peripheral convex portion getting over each other. The disposable puncture device as described.
5. The said inner peripheral side convex part and the said outer peripheral side convex part are provided with two or more by the circumferential direction at equal intervals in each corresponding position of the said support cylinder part and the said locking ring in the circumferential direction. Disposable puncture device.
6. Relatively between the axial front surface of the locking ring and the axially opposed surface of the housing that rotatably supports the locking ring that faces the axial front surface of the locking ring. The disposable puncture device according to claim 1, wherein the restricting means is configured by providing a contact portion that generates resistance due to mutual contact during rotation.
7. The abutting portion that abuts the locking ring and moves the locking ring to the rear side in the axial direction when the locking ring is relatively rotated with respect to the housing. The rotation of the locking ring based on the operation of the operating member is provided by a corresponding contact portion against the biasing force of the spring member exerted by the lancet locked to the locking ring. The disposable puncture device according to claim 6, wherein the disposable puncture device is allowed with the movement of the locking ring toward the rear side in the axial direction.
8. A contact portion that generates resistance due to mutual contact between the axially rear surface of the lock ring and the lock protrusion of the lancet locked to the lock ring during relative rotation. The disposable puncture device according to claim 1, wherein the restricting means is configured by providing a.
9. An axial convex portion is provided on the axially rear surface of the locking ring to constitute the abutting portion, and the relative rotation of the locking ring in the circumferential direction relative to the housing is performed when the lancet is rotated. The locking protrusion and the axial convex portion of the locking ring abut against each other to resist the rotation of the locking ring, and the lancet is on the rear side against the urging force of the spring member. The disposable puncture device according to claim 8, wherein the locking ring is allowed to rotate based on the operation of the operation member by moving to the axial convex portion of the locking ring.

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