JP7001065B2 - Disposable type piercing device - Google Patents

Description

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

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

In such a puncture device, generally, the lancet housed in the housing is urged by a spring member, and the puncture body provided at the tip of the lancet is projected from the housing to operate the puncture. Specifically, as described in Japanese Patent Application Laid-Open No. 2007-52131 (Patent Document 1), the operating member of the housing was pushed and placed behind the lancet while the lancet was locked in the housing. The spring member is compressed and deformed, and when the compressive force of the spring member increases and the lock is released, the lancet protrudes from the housing and is punctured.

However, with such a conventional piercing device, it is difficult to accurately set the compressive force of the spring member required to release the lock of the lancet into the housing. Therefore, even though the spring member is not sufficiently compressed, the lancet is unlocked and the puncture is activated, so that sufficient puncture force is not exerted and the amount of blood exudation is insufficient, or conversely, the operation member is operated. In some cases, it was difficult to perform the puncture operation because the lock of the lancet did not come off even if it was pressed strongly.

In Japanese Patent No. 2007-536008 (Patent Document 2) and Japanese Patent No. 3964457 (Patent Document 3), a contact portion for unlocking is provided on the pressing operation member for compressing and deforming the spring member. A structure has been proposed in which, when the pressing operation member reaches a predetermined position, the contact portion abuts on the locking piece of the lancet locked to the housing to release the locking. However, in these piercing devices, in addition to compressing and deforming the spring member, the force required to deform and unlock the locking piece of the lancet must be applied to the pressing operation member, and the operating force must be applied. It was inevitable that the size would increase.

Further, in International Publication No. 2005/11225 (Patent Document 4) and US Patent Application Publication No. 2005/0070945 (Patent Document 5), the locking piece of the lancet to the housing is laterally pressed. A structure that disengages the lock and causes the protrusion to operate is also disclosed, but when a pressing force from the lateral direction is applied to the locking piece provided on the lancet, the central axis of the lancet may shift and be caught by another member. There is a possibility that the movement of the lancet during the projecting operation may be hindered by being pressed against other members and increasing the frictional resistance during the projecting operation.

On the other hand, in Japanese Patent No. 3993529 (Patent Document 6), the lancet can be rotated in the circumferential direction with respect to the housing, and the locking of the lancet with respect to the seat surface formed on the inner surface of the housing is released by the rotational operation of the lancet. However, if the lancet is rotated by applying a rotational force to the lancet, it may be difficult to sufficiently secure the stability of the locking release and the protrusion operation due to the deformation and 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 spring member may be deformed and the urging operation may be adversely affected.

Further, in Japanese Patent Application Laid-Open No. 2007-536000 (Patent Document 7), the lancet is urged and rotated by bringing the shield into contact with the skin and pushing it inward of the housing, thereby urging the shield and the shield. There is a disclosure of a puncture device in which the lancet is disengaged and punctured. However, the operation of screwing or pulling the tip guard (needle cap) before puncturing may cause the lancet to unintentionally rotate and cause a malfunction in which the shield and the lancet are disengaged.

Japanese Patent Publication No. 2007-52131 Japanese Patent Publication No. 2007-536008 Japanese Patent No. 3964457 International Publication No. 2005/11225 U.S. Patent Application Publication No. 2005/0070945 Japanese Patent No. 3993529 Special Table 2007-536000 Gazette

The present invention has been made in the background of the above-mentioned circumstances, and the problems to be solved thereof are holding the lancet in the puncture preparation position where the lancet is locked at the position where the spring member is compressed, and the puncture operation by releasing the lock. It is an object of the present invention to provide a disposable puncture device having a novel structure capable of reliably and stably operating the puncture device.

The first aspect of the present invention is a disposable piercing device in which a lancet housed in a housing is urged by a spring member and a lancet provided at the tip of the lancet is pierced by protruding from the housing. In the housing, the locking ring is disposed so that the lancet can be displaced in the protruding direction through the locking ring, and the lancet is provided with a locking protrusion. The locking action of the locking protrusion on the locking ring compresses and deforms the spring member so that the lancet is held in the puncture ready position at the back of the housing, while the locking ring. An operating member is provided that disengages the locking protrusion from the locking ring by rotating the blood lancet and displaces the lancet in the protruding direction with the spring member to operate the lancet. In a 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 operating member by exerting resistance on the rotation of the locking ring is provided. In addition to being provided , at least one of the housing and the lancet is provided with a contact portion between the locking ring and the locking ring that causes resistance due to contact in the direction of rotation during relative rotation. It is characterized in that the regulatory means is configured by the relevant contact portion .

According to the disposable puncture device having a structure according to this aspect, a locking ring that is separate from the housing and lancet is adopted, and by rotating this locking ring, it is urged by a spring member to prepare for puncture. The lancet held in position can be unlocked and the puncture can be activated. Therefore, the spring member pre-compressed at the puncture preparation position can exert a stable urging force on the lancet to perform the puncture operation. In addition, since the operating force for puncturing is prevented from being directly applied to the lancet in the lateral direction, the lancet's central axis is displaced, which causes catching and an increase in frictional force to other members. It is prevented and stable puncture operation is realized. Moreover, unlike the lancet urged by the spring member, the locking ring to be rotated can be rotated by itself, so that the puncture operation can be easily and stably performed. ..

Here, in this embodiment, since the regulation means for restricting the rotation of the locking ring that is not based on the operation of the operating member is provided under the state where the rotation of the locking ring is permitted, the operating member It can be prevented that the locking ring unintentionally rotates before the operation to release the locking protrusion from the locking ring. Therefore, the lancet can be stably held at the puncture preparation position before the operation of the operation member, and the puncture operation by the operation of the operation member is realized.

A second aspect of the present invention is the inner and outer circumference of the disposable piercing device according to the first aspect, in which the locking ring and the housing that rotatably supports the locking ring face each other in the radial direction. The regulating means is configured by providing the contact portion on the surface.

According to the disposable piercing device having a structure according to this aspect, since the contact portion constituting the regulating means is provided between the locking ring and the housing in the radial direction, the resistance force due to the contact portion is increased. It is possible to avoid being directly affected by the lancet.

A third aspect of the present invention is the disposable piercing device according to the second aspect, wherein the housing includes a housing body and a housing mouth body provided on the tip end side of the housing body. The housing mouth is provided with a support cylinder portion extending toward the base end side, while the locking ring is extrapolated to the support cylinder portion, and the support cylinder portion and the locking ring are provided. The contact portion is provided between the two and the radial direction.

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

A fourth aspect of the present invention is that, in the disposable lancing device according to the third aspect, the outer peripheral surface of the support cylinder portion is provided with an inner peripheral side convex portion extending in the axial direction, and the locking ring is provided. An outer peripheral side convex portion extending in the axial direction is provided on the inner peripheral surface of the vehicle, and these inner peripheral side convex portions and outer peripheral side convex portions are provided when the locking ring is rotated relative to the support cylinder portion in the circumferential direction. Are in contact with each other to exert resistance to the rotation of the locking ring with respect to the housing, and the inner peripheral side convex portion and the outer peripheral side convex portion get over each other to obtain the operation based on the operation of the operation member. The contact portion that allows rotation of the locking ring is configured.

According to the disposable puncture device having a structure according to this embodiment, the contact between the inner peripheral side convex portion and the outer peripheral side convex portion restricts the careless rotation of the locking ring, while the operating member engages. After the stop ring is rotated and the outer peripheral side convex portion gets over the inner peripheral side convex portion, the locking ring can be smoothly rotated and a good puncture operation can be realized.

A fifth aspect of the present invention is the disposable piercing device according to the fourth aspect, wherein the inner peripheral side convex portion and the outer peripheral side convex portion are a support cylinder portion and the locking ring in the circumferential direction. A plurality of them are provided at equal intervals in the circumferential direction at each corresponding position.

According to the disposable puncture device having a structure according to this embodiment, when the operating member punctures, the overpassing reaction force on the inner peripheral side convex portion of the outer peripheral side convex portion exerted in the direction perpendicular to the axis of the locking ring is a plurality. It is offset between the inner and outer convex parts. As a result, the deviation of the lancet to be punctured and the locking ring in the direction perpendicular to the axis can be suppressed, and the puncture operation can be further stabilized.

A sixth aspect of the present invention is, in the disposable piercing device according to the first aspect, the locking in the axial front surface of the locking ring and the housing that rotatably supports the locking ring. The regulating means is configured by providing the contact portion between the ring and the axially facing surface facing the axially front surface.

According to the disposable puncture device having a structure according to this aspect, since the contact portion constituting the regulating means is provided between the locking ring and the axially facing surface of the housing, it is engaged in the puncture operation by the operating member. Even when the stop ring is rotated, the action of an external force on the locking ring in the direction perpendicular to the axis, and thus the axial deviation of the locking ring and the lancet in the direction perpendicular to the axis can be suppressed.

A seventh aspect of the present invention is the disposable piercing device according to the sixth aspect, wherein the locking ring is locked to the axially facing surface of the housing when the locking ring is relatively rotated with respect to the housing. The contact 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 backward 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 having a structure according to this aspect, a regulatory means for restricting inadvertent rotation of the locking ring can be configured by skillfully utilizing the urging force of the spring member that punctures the lancet. ..

Eighth aspect of the present invention is the disposable piercing device according to the first aspect, wherein the axial 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 the contact portion between the and .

According to the disposable puncture device having a structure according to this aspect, since the contact portion constituting the regulating means is provided between the locking ring and the axially facing surface of the lancet, the puncturing device is locked when the operating member operates the puncture. Even when the ring is rotated, the action of an external force on the locking ring in the direction perpendicular to the axis, and thus the axial deviation of the locking ring and the lancet in the direction perpendicular to the axis can be suppressed. Further, a regulatory means for restricting careless rotation of the locking ring may be configured by skillfully utilizing the locking protrusion of the lancet.

A ninth aspect of the present invention is the disposable piercing device according to the eighth aspect, wherein the locking ring is provided with an axial convex portion on the axial rear surface thereof, and the circumference of the locking ring with respect to the housing is provided. Upon relative rotation in the direction, the locking protrusion of the lancet and the axially convex portion of the locking ring abut against each other, thereby exerting resistance to the rotation of the locking ring and the lancet. Allows the locking ring to rotate based on the operation of the operating member by moving backward against the urging force of the spring member and escaping the axially convex portion of the locking ring. Is what you are doing.

According to the disposable puncture device having a structure according to this aspect, the axially convex portion provided on the locking ring and the locking protrusion of the lancet are in contact with each other, so that the locking ring is not based on the operation of the operating member. When the operating member is operated to operate the puncture, the lancet is moved to the rear side in the axial direction by the axial convex portion, and the contact between the axial convex portion and the locking protrusion is restricted. The contact may be released and the locking ring may be allowed to rotate.

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

The whole plan view which shows the standard state of the disposable type piercing device as the 1st Embodiment of this invention. An exploded perspective view of the piercing device shown in FIG. 1. FIG. 1 is a cross-sectional view taken along the line III-III. FIG. 3 is a sectional view taken along line IV-IV of FIG. FIG. 3 is a sectional view taken along line VV of FIG. Enlarged view of the main part of FIG. FIG. 3 is a perspective view of a locking ring constituting the piercing device shown in FIG. A rear view for explaining the action of the locking ring in the standard state or the puncture ready state shown in FIG. The front view for demonstrating the action of the locking ring in the standard state or the puncture ready state shown in FIG. FIG. 3 is a vertical cross-sectional view corresponding to FIG. 3, showing a puncture ready state of the puncture device shown in FIG. FIG. 10 is a cross-sectional view taken along the line XI-XI of FIG. FIG. 5 is a cross-sectional view corresponding to FIG. 5 for explaining the puncture operation of the puncture device shown in FIG. The rear view for demonstrating the operation of the locking ring in the puncture operation state shown in FIG. The front view for demonstrating the operation of the locking ring in the puncture operation state shown in FIG. FIG. 3 is a vertical cross-sectional view corresponding to FIG. 3, showing a puncture operation state of the puncture device shown in FIG. FIG. 15 is a cross-sectional view taken along the line XVI-XVI of FIG. FIG. 3 is a vertical cross-sectional view corresponding to FIG. 3, showing the puncture device shown in FIG. 1 after puncturing. FIG. 17 is a cross-sectional view taken along the line XVIII-XVIII of FIG. FIG. 3 is a vertical cross-sectional view corresponding to FIG. 3 for explaining the operation of preventing reuse of the piercing device shown in FIG. FIG. 19 is a cross-sectional view taken along the line XX-XX. FIG. 3 is a perspective view of a housing mouth body constituting the housing of the piercing device shown in FIG. 1. FIG. 3 is a perspective view of a locking ring constituting the piercing device shown in FIG. FIG. 2 is a perspective view showing an assembly of the housing mouth body shown in FIG. 21 and the locking ring shown in FIG. 22 in a standard state or a puncture ready state. FIG. 2 is an enlarged cross-sectional view showing a cross section of XXIV-XXIV in FIG. 23. It is a cross-sectional view of the assembly body of the housing mouth body and the locking ring in the puncture operation state or the state after puncture, and is the figure corresponding to FIG. 24. The vertical sectional view which shows the standard state of the disposable type piercing device as the 2nd Embodiment of this invention. FIG. 26 is a cross-sectional view taken along the line XXVII-XXVII of FIG. FIG. 26 is a cross-sectional view taken along the line XXVIII-XXVIII. An exploded perspective view of the piercing device shown in FIG. 26. FIG. 26 is an explanatory view of the operation of the locking ring in the standard state or the puncture ready state shown in FIG. 26, and is a cross-sectional view taken along the line XXX-XXX in FIG. 31. FIG. 26 is a rear perspective view for explaining the action of the locking ring in the puncture ready state shown in FIG. 26. FIG. 26 is a vertical cross-sectional view corresponding to FIG. 26 showing a puncture ready state of the puncture device shown in FIG. 26. FIG. 28 is a cross-sectional view corresponding to FIG. 28 for explaining the puncture operation of the puncture device shown in FIG. 26. It is explanatory drawing of the action of the locking ring in the puncture operation state or the state after puncture shown in FIG. 33, and is the cross-sectional view of XXXIV-XXXIV in FIG. 35. FIG. 33 is a rear perspective view for explaining the action of the locking ring in the puncture operating state shown in FIG. 33. FIG. 26 is a vertical cross-sectional view corresponding to FIG. 26 showing a puncture operation state of the puncture device shown in FIG. 26. FIG. 26 is a vertical cross-sectional view corresponding to FIG. 26 showing after puncturing the puncture device shown in FIG. 26. FIG. 26 is a vertical cross-sectional view corresponding to FIG. 26 for explaining the operation of preventing reuse of the piercing device shown in FIG. 26. FIG. 38 is a cross-sectional view taken along the line XXXIX-XXXIX. The perspective view of the housing mouth body constituting the housing of the disposable type piercing device as the 3rd Embodiment of this invention. FIG. 40 is a cross-sectional view taken along the line XLI-XLI in FIG. FIG. 3 is a perspective view of a locking ring constituting a disposable lancing device as a third embodiment of the present invention. Front view of the locking ring shown in FIG. 42. FIG. 6 is a vertical cross-sectional view showing an assembly of a housing mouth body shown in FIG. 40 and a locking ring shown in FIG. 42 in a standard state or a puncture ready state, and is a cross-sectional view corresponding to FIG. 41. It is a vertical cross-sectional view of the assembly body of the housing mouth body and the locking ring in the puncture operation state or the state after puncture, and is the figure corresponding to FIG. 44. The perspective view of the locking ring constituting the disposable type piercing device as the 4th Embodiment of this invention. The rear view of the locking ring shown in FIG. It is a perspective view which shows the locking ring shown in FIG. 46 in the assembled state of the lancet and the housing mouth body, and is the figure which shows in the puncture preparation state. FIG. 48 is a cross-sectional view taken along the line IL-IL in FIG.

Hereinafter, in order to clarify the present invention more specifically, an embodiment of the present invention relating to a disposable piercing device will be described in detail with reference to the drawings. In the description of the following embodiments, in order to facilitate understanding, first, the basic structure and operation of the disposable piercing device will be described, and then, one of the characteristic configurations of the present invention will be described. The regulatory means for regulating the careless rotation of the stop ring will be described in detail. Therefore, in FIGS. 1 to 20 referred to in the explanation column of the basic structure, the detailed structure related to the regulatory means is omitted, and the detailed structure will be described with reference to FIGS. 21 to 25. ..

[I] Basic Structure and Operation of Disposable Lancing Device as First Embodiment First, FIG. 1 shows a plan view of Disposable Lancing Device 10 as a first embodiment of the present invention. , An exploded perspective view, a vertical sectional view and a horizontal sectional view thereof are shown in FIGS. 2 to 5. In addition, FIGS. 1, 3, 4 and 5 all show the piercing device 10 in a state (standard state) provided as a product to a user in the market. In such a puncture device 10, a lancet 14 and a compression coil spring 16 as a spring member are housed in the housing 12, and the needle cap 18 is removed from the lancet 14 and the operation piece 20 of the housing 12 is pushed. , The lancet 14 protrudes from the housing 12 so that the lancet 14 can be punctured. In the following description, unless otherwise specified, the central axial direction refers to the central axial direction of the housing 12 and the lancet 14 (left-right direction in FIG. 1), and is the left side in FIG. 1 which is the protruding direction of the lancet 14. The direction is called the front or tip side, and the right direction is called the rear or base end side.

More specifically, the housing 12 is composed of a housing body 22 and a housing mouth 24, each of which is made of a resin molded product. The housing main body 22 has a deep-bottomed substantially bottomed cylindrical shape, and a substantially cylindrical housing mouth body 24 is fixedly assembled to the opening portion on the tip end side thereof.

The bottom wall of the housing body 22 is provided with a spring seat 26 that projects inward from the center of the inner surface. Further, the tubular wall of the housing main body 22 is provided with a plurality of guide ridges 28 that protrude on the inner peripheral surface and extend linearly in the axial direction. The plurality of guide ridges 28 form a pair of guide rails 30 and 30 facing each other in the direction perpendicular to the axis on the inner surface of the cylinder wall of the housing main body 22.

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

Further, 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 portion of the cylinder wall of the housing main body 22. On the other hand, a large-diameter engaging ring 38 extending in the circumferential direction is integrally formed on the rear end side of the housing mouth 24 in the axial direction. The engaging ring 38 is connected and supported to the housing mouth 24 by connecting legs 40 projecting from a plurality of positions on the outer peripheral surface of the housing mouth 24.

Then, the housing mouth 24 is combined with the opening portion of the housing body 22, and the engaging rib 36 of the housing body 22 is engaged with the engaging ring 38 of the housing mouth 24, so that the housing is engaged with the housing body 22. The mouth body 24 is assembled. In such an assembled state, the housing mouth 24 is positioned and fixed in the axial direction with respect to the housing body 22 by the engaging action of the engaging rib 36 with respect to the engaging ring 38, and the engaging rib 36 The housing mouth 24 is positioned and fixed to the housing body 22 by the engaging action with the connecting legs 40 even in the circumferential direction.

Further, the housing mouth 24 extends rearwardly on the central axis on the inner peripheral side of the engaging ring 38, thereby forming a support cylinder 42 that enters the housing body 22. There is. Further, the connecting leg portion 40 projecting from the outer peripheral surface of the housing mouth 24 is formed so as to extend axially to the outer peripheral surface of the support cylinder portion 42 by a predetermined length. Furthermore, a pair of cap locking projections 47, 47 located near the opening on the front side are formed on the inner peripheral surface of the housing mouth 24 so as to face each other in the direction perpendicular to the axis.

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

In particular, in the present embodiment, the radial direction in which the pair of first guide grooves 44, 44 face each other and the radial direction in which the pair of second guide grooves 46, 46 face each other are orthogonal to each other. Further, the first guide groove 44 has a larger circumferential width dimension and radial depth dimension than the second guide groove 46, and the support cylinder portion 42 has the first guide groove. The 44 penetrates the peripheral wall of the support cylinder portion 42 and has a slit shape.

The lancet 14 is incorporated in the housing 12 composed of the housing body 22 and the housing mouth 24 in a housed state with respect to the internal space thereof. The housing mouth 24 is preferably transparent or translucent in order to make the blood pool after puncture visible.

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

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

Here, the protruding directions of the pair of reuse prevention protrusions 58 and 58 and the protruding directions of the pair of locking protrusions 60 and 60 are different from each other. In particular, in the present embodiment, the protruding directions of the pair of reuse prevention protrusions 58 and 58 and the protruding directions 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 prevention protrusions 58, 58 is set to be the same as the protruding direction of the pair of guide protrusions 56, 56 around the central axis.

Further, a needle cap 18 is provided on the tip end side of the lancet hub 50. The needle cap 18 has a rod shape, and is integrally molded by extending from the tip of the lancet hub 50 on which the puncture needle 52 is projected on the same central axis. The boundary between the lancet hub 50 and the needle cap 18 is a threaded portion 64 whose outer diameter is reduced in a constricted shape, and the needle cap 18 is twisted around the central axis of the lancet hub 50 to form a threaded portion. The needle cap 18 can be manually removed from the lancet hub 50 by detaching it with 64. By removing the needle cap 18 from the lancet hub 50, the tip of the puncture needle 52 covered with the needle cap 18 can be exposed.

Further, as shown in FIG. 6, the tip portion of the needle cap 18 is a flat grip portion 66, and the rear end portion of the grip portion 66 has protrusions on both side portions in the width direction. The 68 and the tongue piece-shaped elastic claw portion 70 are formed so as to project so as to face each other in the axial direction.

The lancet 14 is arranged 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 into the housing mouth 24. Is assembled. Further, when assembling the lancet 14 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 of the housing body 22 and arranged on the central axis, and its rear end is fitted and positioned in the spring seat 26 of the housing body 22 and is positioned in front of the compression coil spring 16. The end is fitted to the spring seat 54 of the lancet hub 50. As a result, 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). ), It is compressed and deformed, and the urging force due to 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 extrapolated and rotated by the support cylinder portion 42 of the housing mouth 24. It is installed as possible. A pair of contact legs 74, 74 projecting forward are integrally formed on the locking ring 72, and the contact legs 74 are connected to each other on the circumference of the support cylinder 42. It is inserted between the legs 40 and 40. Then, when the locking ring 72 rotates, the contact leg portion 74 abuts on the connecting leg portion 40 in the circumferential direction, so that the locking ring 72 rotates in the circumferential direction on the support cylinder portion 42. The permissible range is set to be less than 45 degrees.

Further, the locking ring 72 is integrally formed with an inner flange-shaped engaging portion 75 located at the rear end portion, and a pair of first passing grooves 76 is formed on the inner peripheral surface of the engaging portion 75. , 76 and a pair of second passage grooves 78 and 78 are formed so as to be radially opposed to each other and extend in parallel in the axial direction. Both the first passage grooves 76, 76 and the second passage grooves 78, 78 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. Further, the first passage groove 76 of the engaging portion 75 has a cross-sectional shape slightly larger than the reuse prevention protrusion 58 of the lancet hub 50, and the reuse prevention protrusion 58 is inside the first passage groove 76. Is movable in the axial direction. On the other hand, the second passing groove 78 of the engaging portion 75 has a cross-sectional shape slightly larger than that of the locking protrusion 60 of the lancet hub 50, and the locking protrusion 60 passes through the inside of the second passing groove 78. It is said to be movable in the axial direction.

Further, in the locking ring 72, the angle (intersection angle) 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 set in the lancet hub 50. The angle (intersection angle) between the pair of reuse prevention protrusions 58 and 58 facing each other and the pair of locking protrusions 60 and 60 facing each other is different. In particular, in the present embodiment, the radial direction in which the pair of first passing grooves 76, 76 face each other and the radial direction in which the pair of second passing grooves 78, 78 face each other are configured to intersect each other at approximately 60 degrees. There is.

As a result, as is clear from FIGS. 8 and 9, the pair of reuse prevention protrusions 58 and 58 of the lancet hub 50 are engaged with the locking ring under the state where the lancet hub 50 is inserted through the locking ring 72. At relative positions in the circumferential direction that are aligned with the pair of first passage grooves 76, 76 of 72 and allow axial passage, the pair of locking protrusions 60, 60 of the lancet hub 50 are the locking ring 72. It is in a misaligned state with respect to the pair of second passage grooves 78, 78, and the locking protrusions 60, 60 are locked to the locking ring 72 to prevent the movement in the forward direction in the axial direction. There is. On the other hand, under the condition that the pair of locking protrusions 60, 60 of the lancet hub 50 are aligned with the pair of second passage grooves 78, 78 of the locking ring 72 and allow axial passage, the lancet hub The pair of reuse prevention protrusions 58, 58 of 50 are in a misaligned state with respect to the pair of first passage grooves 76, 76 of the locking ring 72, and the reuse prevention protrusions 58, 58 are on the locking ring 72. It is locked to prevent the lancet hub 50 from moving backward in the axial direction with respect to the locking ring 72.

The pair of reuse prevention protrusions 58, 58 and the pair of locking protrusions 60, 60 in the lancet hub 50 are slightly larger than the thickness dimension of the engaging portion 75 in the locking ring 72 in the central axial direction. Only the distance away. As a result, under the condition that the reuse prevention protrusions 58 and 58 are disengaged in the axially forward position of the engaging portion 75 and the locking protrusions 60 and 60 are disengaged in the axially rearward position of the engaging portion 75. The locking ring 72 extrapolated to the lancet hub 50 can be rotated with respect to the lancet hub 50. Then, by rotating the locking ring 72, either one of the pair of reuse prevention protrusions 58 and 58 and the pair of locking protrusions 60 and 60 can be selectively selected as the first passage grooves 76 and 76. Alternatively, it is aligned with the second passage grooves 78 and 78 so that the passage displacement in the axial direction can be tolerated.

Further, a pair of pressing pieces 80, 80 are integrally formed on the outer peripheral surface of the locking ring 72 so as to project on both sides in the radial direction. The pressing piece 80 has an unequal side right-angled triangular shape in the axial direction of the locking ring 72, and the surface corresponding to the hypotenuse is the pressing inclined surface 82 inclined around the central axis of the locking ring 72. Has been done. Then, as shown in FIGS. 3 and 5, these pressing pieces 80, 80 are inside the operation piece 20 of the housing main body 22 with the locking ring 72 attached to the support cylinder portion 42. It is aligned so that it is located at.

In this way, the lancet 14 is incorporated into the housing 12 together with the compression coil spring 16 and the locking ring 72, whereby the piercing device 10 of the present embodiment is configured. In the lancet 14 incorporated in the housing 12, the guide protrusions 56 and 56 projecting from the lancet hub 50 are inserted into the guide rails 30 and 30 as a guide mechanism for guiding the lancet 14 in the protruding direction. Axial movement is permitted with the rotation of the lancet 14 around the central axis, which is a circumferential displacement with respect to the housing 12, blocked.

Further, in the standard state as a product provided to the user, as shown in FIG. 4, the cap locking protrusions 47 and 47 of the housing mouth 24 are respectively the protrusion 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 in the axial direction between the elastic claws 70, and the knob portion 66 of the needle cap 18 protrudes outward from the housing mouth 24 by a predetermined length. On the other hand, it is positioned in the axial direction.

In such a standard state, as shown in FIG. 3, the lancet 14 compressively deforms the compression coil spring 16 so that the locking protrusions 60, 60 of the lancet hub 50 are positioned further behind the locking ring 72. Until then, it is pushed all the way to the back of the housing body 22. Under such conditions, as shown in FIG. 4, the reuse prevention protrusions 58 and 58 of the lancet hub 50 support the first passage grooves 76 and 76 of the locking ring 72 and the housing mouth 24. It is located so as to straddle the first guide grooves 44, 44 of the tubular portion 42. 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 with each other at the reuse prevention protrusion 58, so that the locking ring 72 is attached to the housing mouth body 24. On the other hand, it is engaged so as not to rotate relative to each other in the circumferential direction, and an erroneous operation prevention mechanism is configured.

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 faces inward of the operating piece 20. Then, by pushing the operation piece 20 into the housing 12 with a finger, one end of the operation piece 20 in the circumferential direction is pressed against the pressing inclined surface 82, and the component force exerted according to the inclination angle of the pressing inclined surface 82 is exerted. Based on the action, the pressing force of the operation piece 20 is converted into a rotational force and applied to the locking ring 72. However, in the standard state shown in FIGS. 3 and 4, since the rotation of the locking ring 72 with respect to the housing 12 is prevented as described above, even if the operation piece 20 is erroneously pressed, the puncture device 10 is expected. The puncture does not work without it.

[Preparation for puncture]
Next, the operation of operating the puncture 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. 3 and 4, the housing 12 thereof. Is grasped with one hand, the needle cap 18 is picked up with the other hand, and the needle cap 18 is rotated. As a result, the protrusion 68 of the needle cap 18 and the elastic claw portion 70 are separated from the cap locking protrusion 47 of the housing mouth 24, and the needle cap 18 is threaded from the lancet hub 50 by the thread cutting portion 64 to form the needle cap. 18 is removed from the housing mouth 24. By such an operation, the puncture device 10 is changed from the standard state to the puncture ready state shown in FIGS. 10 and 11.

In the puncture device 10 in the puncture ready 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. Be moved. Then, the locking protrusion 60 of the lancet hub 50 comes into contact with the rear end surface of the engaging portion 75 of the locking ring 72, and the displacement forward in the axial direction is prevented. By the locking action of the locking protrusion 60 on the locking ring 72, the lancet 14 is held at the puncture preparation position.

Further, by moving the lancet hub 50 forward to this position, the reuse prevention protrusions 58 and 58 of the lancet hub 50 are forward from the engagement position of the locking ring 72 with the first passage grooves 76 and 76. It is disengaged from the above and is positioned so as to engage only with the first guide grooves 44 and 44 of the housing mouth 24.

As described above, in the puncture ready state, the reuse prevention protrusions 58, 58 and the locking protrusions 60, 60 of the lancet hub 50 are the first passage groove 76, 76 and the second passage groove 78, of the locking ring 72. The locking ring 72 is allowed to rotate in the housing 12 by being disengaged from the front and the rear in the axial direction with respect to the 78 in the non-engaged state.

[Puncture operation state]
Therefore, in order to operate the puncture from the puncture ready state to the puncture operation state, as shown in FIG. 12, the puncture device 10 in the puncture ready state may be grasped and the operation piece 20 may be pushed in by the finger. .. By pushing the operation piece 20 against the pressing inclined surface 82 of the locking ring 72 as shown by the alternate long and short dash line in FIG. 12, the locking ring 72 rotates with respect to the housing 12 and the lancet 14 around the central axis. .. Then, as shown in FIGS. 13 and 14, the second passage of the locking ring 72 with respect to the locking protrusions 60 and 60 of the lancet hub 50 that was in contact with the rear end surface of the locking ring 72. When the grooves 78 and 78 are aligned, the axial displacement blocking force of the locking protrusions 60 and 60 by the locking ring 72 is released, and the locking protrusions 60 and 60 pass through the locking ring 72 for the second time. Axial forward displacement is allowed through the grooves 78, 78.

As a result, as shown in FIGS. 15 and 16, the lancet 14 vigorously moves forward in the housing 12 based on the urging force of the compression coil spring 16. Then, the lancet 14 moves forward in the axial direction until the guide protrusions 56 and 56 of the lancet 14 abut on the rear end surface of the locking ring 72, so that the tip side of the guide protrusions 56 and 56 of the lancet 14 holds the locking ring 72. At the same time as 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]
During the above-mentioned puncture operation, the lancet 14 moves forward in the axial direction beyond the free length of the compression coil spring 16 due to the urging force of the compression coil spring 16. At that time, since both ends of the compression coil spring 16 in the axial direction are fixed to the bottom of the housing body 22 and the rear end of the lancet 14, when the puncture needle 52 protrudes from the housing mouth 24, the puncture needle 52 is punctured. , The restoring force of the compression coil spring 16 with respect to the lancet 14 is exerted 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 promptly pulled back into the housing 12 as shown in FIGS. The needle tip of the puncture needle 52 is housed in the housing mouth 24.

[Prevention of reuse]
Further, after the puncture 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. 17 and 18. Further, the locking ring 72 rotated by the operation piece 20 is also kept in the position after rotation as shown in FIGS. 13 and 14. That is, after the puncture, the locking ring 72 is maintained in the rotational position in which the locking ring 72 is in the unlocked state without the rotational force being applied, so that even if the lancet 14 is pushed into the back of the housing 12, the locking collision occurs. The portion 60 only moves in the second passage groove 78, and the locking protrusion 60 is not locked with respect to the locking ring 72. Therefore, even if the operation piece 20 is operated after the puncture, the puncture operation in which the lancet 14 protrudes forward in the axial direction is not reproduced.

In addition, as shown in FIGS. 13 and 14, even when a wire rod or the like is inserted from the front opening of the housing 12 after puncturing and the lancet 14 is pushed into the depth of the housing 12 to forcibly try to reuse it. In addition, the relative positions of the reuse prevention protrusions 58 and 58 and the locking protrusions 60 and 60 in the lancet 14 in the circumferential direction are the first passage grooves 76 and 76 and the second passage grooves 78 and 78 in the locking ring 72. Since it is different from the relative position in the circumferential direction with, reuse can be prevented more reliably.

That is, when the lancet 14 is forcibly pushed into the back of the housing 12, the locking protrusions 60, 60 of the lancet 14 can be aligned with the second passage grooves 78, 78 in the circumferential direction. Even if the stop portions 60, 60 could be moved deeper than the locking ring 72, at that point, the reuse prevention protrusions 58, 58 are already misaligned with respect to the first passage grooves 76, 76. There is. Therefore, as shown in FIGS. 19 and 20, when the lancet 14 is further pushed in from there, the reuse prevention protrusions 58 and 58 abut on the front end surface of the engaging portion 75 of the locking ring 72. By simply moving the locking ring 72 together with the lancet 14 to the back of the housing 12, the lancet 14 is locked again with respect to the locking ring 72 to prepare for puncture as shown in FIGS. 8 to 11. Is virtually impossible.

In particular, in the present embodiment, the locking ring 72 is located in the inner direction of the housing mouth 24, has a larger diameter than the support cylinder 42 of the housing mouth 24, and is extrapolated to the support cylinder 42. There is. Therefore, the locking ring 72 is hardly visible even when looking through the front opening of the housing mouth 24, and therefore, the lancet 14 is pushed in and locked at the same time through the small front opening of the housing mouth 24. It is virtually impossible to rotate and 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 engagement action of the guide protrusions 56 and 56 with the guide rails 30 and 30, the lancet 14 is rotated to the locking ring 72. It is also not possible to exert a relative rotation effect on. Furthermore, as described above, since the locking ring 72 is allowed to move to the back of the housing body 22, let's rotate the locking ring 72 with a wire rod or the like inserted from the front opening of the housing mouth 24. Even so, it is difficult to even obtain an axial contact reaction force with respect to the locking ring 72 such as a wire rod.

[Ii] Specific structure and operation of the regulating means in the disposable puncture device In the present embodiment, in order to regulate the rotation of the locking ring 72 that is not based on the operation of the operation piece 20 in the puncture ready state, the following structure is used. Regulatory measures have been adopted. The housing mouth 24 in the present embodiment will be described in detail in FIG. 21, and the locking ring 72 in the present embodiment will be described in detail in FIG. 22.

The housing mouth 24 of the present embodiment is provided with an inner peripheral side convex portion 84 extending in the axial direction between the circumferential directions of the connecting legs 40, 40 on the outer peripheral surface of the support cylinder portion 42. A pair of inner peripheral side 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 the present embodiment, the respective inner peripheral side convex portions 84 are separated from the end side convex portion 84a adjacent to the connecting leg portion 40 and the end side convex portion 84a in the circumferential direction, and the connecting leg portions 40, 40. It is composed of a central convex portion 84b located substantially in the center of the circumferential direction. As a result, a concave portion 86 that is relatively concave with respect to the both convex portions 84a and 84b is formed between the end-side convex portion 84a and the central convex portion 84b in the circumferential direction. Each of the central convex portions 84b has a substantially semicircular cross section, and the outer peripheral surface has a curved surface shape. 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. Further, on the outer peripheral surface of the support cylinder portion 42, no unevenness is provided on the side opposite to the end side convex portion 84a with respect to the central convex portion 84b, and the outer peripheral surface of the support cylinder portion 42 spreads smoothly. There is.

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

Then, the housing mouth 24 and the locking ring 72 are assembled as shown in FIGS. 23 and 24 in the standard state. That is, the contact legs 74, 74 of the locking ring 72 are inserted between the circumferential directions of the connecting legs 40, 40 of the housing mouth 24, and the locking ring 72 is provided on the housing mouth 24. It is extrapolated to the support cylinder portion 42 and is rotatably supported.

Here, in the standard state, the concave portions formed between the end side convex portions 84a, 84a and the central convex portions 84b, 84b in the inner peripheral side convex portions 84, 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 are inserted into the 86 and 86. That is, the inner peripheral side convex portions 84, 84 and the outer peripheral side convex portions 88, 88 are formed at the corresponding positions of the support cylinder portion 42 and the locking ring 72, and the inner peripheral side convex portions 84, The 84 and the outer peripheral side convex portions 88 and 88 are formed at equal intervals in the circumferential direction, respectively. The inner peripheral side convex portion 84 (end side convex portion 84a and 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) is abutted with substantially zero touch or is opposed to each other with a slight separation distance. On the other hand, does the outer peripheral side 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 side convex portion 84 is not provided) with substantially zero touch? They face each other with a slight separation distance.

From such a standard state, the needle cap 18 provided at the tip of the lancet 14 is twisted to prepare for puncture, so that the locking ring 72 can be rotated 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 when the locking ring 72 is allowed to rotate with respect to the support cylinder 42. That is, under the state where the rotation of the locking ring 72 is allowed, the outer peripheral side convex portions 88 and 88 and the inner peripheral side convex portions 84 and 84, particularly the central convex portions 84b and 84b, come into contact with each other. As a result, the free rotation of the locking ring 72 with respect to the support cylinder portion 42 is restricted. Further, not only in the puncture ready state, but also in the process of twisting the needle cap 18 provided at the tip of the lancet 14 from the standard state to the puncture ready state, the force for twisting the needle cap 18 is locked. By transmitting 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 the present embodiment, the inner peripheral side convex portions 84, 84 and the outer peripheral side convex portions 88, 88 provided between the support cylinder portion 42 (housing mouth body 24) and the locking ring 72 in the radial direction are provided. It is a contact portion that causes resistance by abutting each other when the locking ring 72 rotates with respect to the support cylinder portion 42. That is, by providing the contact portion, resistance is exerted when the locking ring 72 is rotated under 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 the above is restricted, in the present embodiment, the restricting means is configured by such a contact portion.

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 side convex portions 88 and 88 are at the center of the inner peripheral side convex portions 84 and 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 overcoming of the central convex portions 84b, 84b by the outer peripheral side convex portions 88, 88 can be achieved, for example, by bending and deforming the contact leg portions 74, 74 of the locking ring 72 toward the outer peripheral side. As a result, the axial displacement blocking force between the locking ring 72 and the locking protrusions 60, 60 of the lancet hub 50 is released, and the axially forward displacement of the locking protrusions 60, 60 can be allowed. .. As a result, the lancet 14 vigorously moves forward in the housing 12 based on the urging force of the compression coil spring 16, and the puncture operation is realized.

In the disposable puncture device 10 of the present embodiment having the above structure, when the needle cap 18 is pulled out to prepare for puncture, the locking ring 72 is in a state where rotation is permitted. In the above, the rotation of the locking ring 72 is restricted by the resistance applied to the rotation of the locking ring 72, which is not based on the operation of the operation piece 20. As a result, it is possible to prevent the locking ring 72 from unintentionally rotating with respect to the support cylinder portion 42 and moving the lancet 14 forward in the axial direction before the operation of the operation piece 20.

In particular, the regulating means for restricting the rotation of the locking ring 72 is composed of the inner peripheral side convex portions 84, 84 and the outer peripheral side convex portions 88, 88, and the rotation of the locking ring 72 is the inner peripheral side. It is regulated by the contact between the central convex portions 84b, 84b of the side convex portions 84, 84 and the outer peripheral side convex portions 88, 88, while the outer peripheral side convex portions 88, 88 are allowed by overcoming the central convex portions 84b, 84b. Has been done. That is, when the locking ring 72 rotates, for example, the locking ring 72 and the lancet 14 do not move in the axial direction, so that vibrations and the like accompanying the movement of the locking ring 72 and the lancet 14 in the axial direction occur. It is suppressed and the lancet 14 is prevented from shaking.

Further, after the outer peripheral side convex portions 88, 88 get over the central convex portions 84b, 84b, since no unevenness is provided, the outer peripheral side convex portions 88, 88 have zero touch or zero touch on the outer peripheral surface of the support cylinder portion 42. The locking ring 72 is rotated with respect to the support cylinder portion 42 in a state of being slightly separated and facing each other. Therefore, after the outer peripheral side convex portions 88 and 88 get over the central convex portions 84b and 84b, the locking ring 72 is smoothly rotated, and the user does not feel a feeling of resistance such as a feeling of being caught. Can be operated.

[Iii] Disposable Lancing Device as a Second Embodiment Next, a disposable lancing device adopting a locking ring having a different structure will be exemplified as a second embodiment of the present invention in FIGS. 26 to 39. In the following description, the members and parts having the same structure as that of the first embodiment will be described in detail by assigning the same reference numerals as those of the first embodiment in the drawings. Omit.

The first embodiment of the piercing device 100 of the present embodiment is shown in FIG. 29 as an exploded view thereof and as shown in FIGS. 26 to 28 as the standard state provided as a product to the user in the market. Compared to the form, it does not have a pair of reuse prevention protrusions (58, 58) protruding from the lancet hub 50. In this embodiment, a pair of rotation-preventing protrusions 102, 102 are formed at substantially the same positions as the pair of reuse-preventing 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, the inner flange-shaped engaging portion 75 is formed with a pair of notched portions 104, 104 extending substantially 1/4 of a circumference so as to face each other in the radial direction. A pair of cut-out portions 106, 106 having a partially cut wall thickness are formed on the rear end surface of the engaging portion 75 of the locking ring 72 so as to face each other in the radial direction. The pressing inclined surface 82 is formed by a stepped surface on the boundary line of the cutout portion 106 located on the rear end surface of the engaging portion 75 of the locking ring 72. That is, instead of the pressing pieces 80, 80 projecting on the outer peripheral surface of the locking ring 72 in the first embodiment, the meat-cut portions 106, 106 are provided in the present embodiment, and the meat-missing portions 106, 106 are provided. The pressing inclined surface 82 formed of the stepped surface on the boundary line of 106 causes the component force of the pushing force of the operation piece 20 provided in the housing 12 to be exerted as a rotational force on the locking ring 72. It is.

Then, in the standard state shown in FIGS. 26 to 28, under the state where the lancet 14 is axially positioned with respect to the housing 12 by locking the needle cap 18 to the housing mouth 24, the locking protrusion 60 Is located axially rearward from the rear end surface of the engaging portion 75, while the rotation blocking protrusions 102, 102 are located within the engaging portions 75, 75, as shown in FIG. is doing. Under such a state, both ends in the circumferential direction of each rotation blocking protrusion 102 are opposed to the circumferential end faces of the notch portions 104 around the central axis. As a result, when the locking ring 72 rotates around the central axis, the rotation blocking protrusion 102 of the lancet 14 comes into contact with the notch 104 of the engaging portion 75. Further, the guide protrusions 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 between the rotation blocking protrusions 102 and 102 with respect to the notches 104 and 104 and the guide protrusions 56 and 56 are inserted into the guide rails 30 and 30 to prevent rotation around the central axis. The prevention mechanism prevents the rotation of the locking ring 72 by engaging with the housing 12 via the lancet 14.

Next, in order to perform the puncture operation using the puncture device 100 provided in the standard state as described above, the needle cap 18 is screwed from the lancet hub 50 and pulled out from the housing mouth 24 as in the first embodiment. Therefore, the puncture ready state is set as shown in FIGS. 31 and 32. In the puncture device 100 in the puncture ready state, 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, as in the first embodiment. It is moved so that the locking protrusions 60 and 60 of the lancet hub 50 are in contact with the rear end surface of the engaging portion 75 of the locking ring 72.

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

Therefore, in the puncture ready state, when the operation piece 20 is pushed inward of the housing 12 as in the first embodiment, the operation piece 20 is pressed against the pressing inclined surface 82 of the locking ring 72, and the operation piece 20 is pressed against the pressing inclined surface 82 in the rotation direction. The component force causes the locking ring 72 to rotate about the central axis with respect to the housing 12 and the lancet 14. As a result, as shown in FIGS. 33 to 35, the locking protrusions 60 and 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 replaced with the locking ring 72. When aligned with the notches 104 and 104 of, the axial displacement blocking force exerted on the lancet hub 50 is released, and the locking protrusions 60 and 60 press the notches 104 and 104 of the locking ring 72. Displacement is allowed to move forward in the axial direction.

As a result, as shown in FIG. 36, the lancet 14 vigorously moves forward in the housing 12 based on the urging force of the compression coil spring 16, and the puncture needle 52 is the same as in the first embodiment. The puncture operation is realized by momentarily protruding from the front opening of the housing 12. In this embodiment, a plurality of positioning ribs 108 are provided on the inner peripheral surface of the tubular portion of the housing main body 22 so as to extend axially from the bottom side on which the compression coil spring 16 is arranged. .. The plurality of positioning ribs 108 allow the compression coil spring 16 to be stably positioned on the central axis in the housing body 22 and to be expanded and contracted.

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 shown in FIGS. 34 and 35. It remains in its post-rotation position as shown in. Therefore, after puncture, as shown in FIGS. 38 and 39, even if the lancet 14 is pushed into the interior of the housing 12 forcibly to be reused, the locking protrusion 60 of the lancet 14 ,. Simply move 60 through the notches 104, 104 of the locking ring 72 to the back of the housing body 22 to relock the lancet 14 to the locking ring 72 and puncture as shown in FIGS. 30-32. It is virtually impossible to get ready.

In particular, in the present embodiment, the rotation of the lancet 14 with respect to the housing 12 around the central axis is prevented by inserting the guide protrusions 56 and 56 into the guide rails 30 and 30, so that the pushed lancet 14 is rotated. It cannot be locked to the locking ring 72. Therefore, in order to be ready for puncture again after puncturing, it is necessary to push the lancet 14 through the small anterior opening of the housing mouth 24 and at the same time rotate and displace the locking ring 72. It is even more difficult to use.

Also in this embodiment, the same regulatory means as those described in the above [ii] column are adopted, and the regulatory means prevents the locking ring 72 from inadvertently rotating in the puncture ready state. Therefore, the locking release of the lancet 14 and the displacement in the protruding direction are prevented unintentionally, and the locking ring 72 is forced beyond the regulation by the regulating means when the puncture operation by the pushing operation of the operation piece 20 is performed. By being rotated to, the desired puncture operation can be realized.

[Iv] Disposable Lancing Device as a Third Embodiment Next, FIGS. 40 to 45 show a disposable lancing device as a third embodiment of the present invention. As the members other than the housing mouth 120 and the locking ring 122 in the present embodiment, those having the same structure as that of the first embodiment may be adopted, and therefore detailed description thereof will be omitted. That is, in this embodiment, the housing mouth 120 shown in FIGS. 40 and 41 and the locking ring 122 shown in FIGS. 42 and 43 are adopted.

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

Then, on the axial rear surface (upper surface in FIGS. 40 and 41) of the outer peripheral protrusions 124, 124, the axial dimension is from the side adjacent to the connecting leg portion 40 in the circumferential direction toward the side not adjacent to the connecting leg portion 40. An inclined surface 126, 126 is provided, and in the present embodiment, substantially the entire surface of the axial rear surface of the outer peripheral protrusions 124, 124 is the inclined surface 126, 126.

On the other hand, in the locking ring 122 of the present embodiment, the axial front surfaces of the contact legs 74, 74 are provided with inclined surfaces 128, 128 whose axial dimensions decrease from one of the circumferential directions toward the other. In particular, in the present embodiment, substantially the entire surface of the axial front surface of the contact leg portions 74, 74 is the inclined surface 128, 128.

The housing mouth 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 legs 74, 74 extending from the locking ring 122 are inserted between the connecting legs 40, 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, 126 provided on the housing mouth 120 and the inclined surfaces 128, 128 provided on the locking ring 122 are formed at substantially the same inclination angle, and in a standard state, these inclined surfaces 126 are formed. , 128 are in contact with each other or face each other in the axial direction with a slight separation distance. Therefore, in the present embodiment, the axially facing surfaces of the locking ring 122 facing the axially forward surfaces (inclined surfaces 128 and 128) are configured by the inclined surfaces 126 and 126 provided in the housing mouth body 120. ..

From such a standard state, the needle cap (18) provided at the tip of the lancet (14) is twisted to prepare for puncture, but in the present embodiment, the support cylinder portion 42 is prepared for puncture. Even when the locking ring 122 is allowed to rotate, the inclined surfaces 126, 126 of the outer peripheral protrusions 124, 124 provided on the housing mouth 120 and the inclined surfaces 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 the 128 and 128.

That is, in the present embodiment, when the locking ring 122 is rotated, the contact portion that abuts against the inclined surfaces 128 and 128, which are the axially forward surfaces of the locking ring 122, to generate resistance is the housing opening. It is composed of inclined surfaces 126, 126 of outer peripheral protrusions 124, 124 provided on the body 120. As such, such abutting portions are provided on the axially facing surfaces (inclined surfaces 126, 126) facing the inclined surfaces 128, 128, which are the axially forward surfaces of the locking ring 122. Then, in a state where the rotation of the locking ring 122 is permitted by the contact portion, resistance is exerted when the locking ring 122 is rotated, and the operation piece (operation member) (20) is operated based on the operation. Since the rotation of the locking ring 122 is restricted, in the present embodiment, the abutting portion constitutes the restricting 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 inclined surfaces 128 and 128 provided on the locking ring 122 are the housing openings as shown in FIG. 45. The locking ring 122 is allowed to rotate with respect to the support cylinder portion 42 over the inclined surfaces 126 and 126 provided on the body 120. In the overpassing of the inclined surfaces 126 and 126 by the inclined surfaces 128 and 128, the inclined surfaces 126 and 126 and the inclined surfaces 128 and 128 are brought into mutual contact with each other as the operation piece 20 is pushed in, and the component force of the contact force is applied. This is done by acting as an axially rearward pushing force of the stop ring 122 to move the locking ring 122 and the lancet (14) axially rearward against the urging force of the compression coil spring (16). .. Then, when the inclined surfaces 128 and 128 get over the inclined surfaces 126 and 126, the locking ring 122 is allowed to rotate with respect to the support cylinder portion 42, and the locking ring 122 and the lancet hub (50) are engaged with each other. The axial displacement blocking force with the portion (60,60) is released, and the axially forward displacement of the locking protrusion (60,60) can be allowed. As a result, the lancet (14) vigorously moves forward in the housing (12) based on the urging force of the compression coil spring (16), and the puncture operation is realized.

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

[V] Disposable Lancing Device as the Fourth Embodiment Next, FIGS. 46 to 49 will be shown, and the disposable lancing device as the fourth embodiment of the present invention will be described. As the members other than the locking ring 130 and the lancet 132 in the present embodiment, those having the same structure as that of the first embodiment can be adopted, and therefore detailed description thereof will be 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 adopted.

The locking ring 130 in the present embodiment is provided with an axial convex portion 136 projecting to the axial rear side on the axial rear end surface 135 of the engaging portion 134 which is the axial rear surface. In the present embodiment, on the axial rear end surface 135 of the engaging portion 134, a pair of axially convex portions 136, 136 are perpendicular to the axis at positions substantially adjacent to the second passage grooves 78, 78 in the radial direction. It is formed to extend in the direction.

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

Then, the locking ring 130, the lancet 132, and the housing mouth 24 are assembled. That is, in the standard state, particularly the narrow width portions 142 and 142 of the locking protrusions 138 and 138 of the lancet 132 abut against the engaging portion 134 of the locking ring 130 in the axial direction, and the locking ring 130 The particularly narrow width portions 142 and 142 of the locking protrusions 138 and 138 of the lancet 132 are in contact with the axially convex portions 136 and 136 in the circumferential direction or face each other in the circumferential direction with a slight separation distance.

From such a standard state, the needle cap (18) provided at the tip of the lancet 132 is twisted to prepare for puncture, but in the present embodiment, as shown in FIGS. 48 and 49, preparation for puncture is performed. Even under the condition that the locking ring 130 is allowed to rotate with respect to the support cylinder portion 42, the engagement provided with the axially convex portions 136 and 136 provided on the locking ring 130 and the lancet 132. When the stop protrusions 138 and 138, in particular the narrow width portions 142 and 142, come into contact with each other, resistance is exerted on the rotation of the locking ring 130 with respect to the support cylinder portion 42, and the locking ring 130 can freely rotate. It is regulated.

That is, in the present embodiment, when the locking ring 130 is rotated, the abutting portion that abuts against the locking protrusions 138 and 138 of the lancet 132 to generate resistance is rearward in the axial direction of the locking ring 130. It is composed of axial protrusions 136 and 136 provided in the direction (axial rear end surface 135). Then, in a state where the rotation of the locking ring 130 is permitted by the contact portion, a resistance is exerted when the locking ring 130 is rotated, and the operation piece (operation member) (20) is operated based on the operation. Since the rotation of the locking ring 130 is restricted, in the present embodiment, the abutting portion constitutes the restricting means.

Then, with the puncture operation, the operation piece (20) is pushed in and an external force is applied to the pressing inclined surface 82, so that the locking protrusions 138 and 138 provided on the lancet 132 are provided in the locking ring 130 in the axial direction. The locking ring 130 is allowed to rotate with respect to the support tube portion 42 over the protrusions 136 and 136 (escape). In the overpassing of the axially convex portions 136 and 136 by the locking protrusions 138 and 138, the locking protrusions 138 and 138 and the axially convex portions 136 and 136 are brought into contact with each other as the operation piece 20 is pushed in. The contact force is applied as a pushing force of the lancet 132 to the rear in the axial direction, and the lancet 132 is moved to the rear in the axial direction against the urging force of the compression coil spring (16). Then, when the locking protrusions 138 and 138 get over the axially convex portions 136 and 136, the locking ring 130 is allowed to rotate with respect to the support cylinder portion 42, and the locking ring 130 and the lancet 132 are locked. The axial displacement blocking force with the protrusions 138 and 138 is released, and the locking protrusions 138 and 138 can be allowed to be displaced forward in the axial direction. As a result, the lancet 132 vigorously moves forward in the housing (12) based on the urging force of the compression coil spring (16), and the puncture operation is realized.

Also in the disposable puncture device of the present embodiment having the above-mentioned structure, the locking ring 122 is intended for the support cylinder portion 42 before the operation of the operation piece (20), as in the first embodiment. It can be avoided that the lancet (14) moves forward in the axial direction by rotating without rotating. Further, also in the present embodiment, when the locking ring 130 is rotated, the lancet 132 only moves backward in the axial direction and does not shift in the direction perpendicular to the axis, so that the lancet 132 may shake during the puncture operation. Can be effectively reduced.

Although the embodiments of the present invention have been described in detail above, this is merely an example, and the present invention is not to be construed in any limitation by the specific description of the embodiments.

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

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 inner 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, are provided on the inner peripheral surface of the locking ring 72. 88 is provided, and the contact portion is composed of the inner peripheral side convex portions 84, 84 and the outer peripheral side convex portions 88, 88, but the present invention is not limited to this aspect. That is, 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, and the convex portion is fitted into the concave portion to fit the operation member. A regulatory means for restricting the rotation of the locking ring 72 that is not based on the operation of the (operation piece 20) may be configured.

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

Further, in the first, third, and fourth embodiments, a pair of contact portions (inner peripheral side convex portion 84, outer peripheral side convex portion 88, inclined surface 126, axial convex portion 136) face each other in the radial direction. Although it was provided, it may be provided only at one place on the circumference, or it may be provided at three or more places. When 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.

Further, 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 these may be used in combination with each other, and may be applied to, for example, the inner peripheral surface and the axial front surface of the locking rings 72, 122, 130. 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, 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 operating member (operation piece 20) is the contact portion (inner circumference). It was composed of a side convex portion 84, an outer peripheral side convex portion 88, an inclined surface 126, and an axial convex portion 136), but the present invention is not limited to this aspect. That is, an urging member for urging the locking rings 72, 122, 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, 130. By exerting this effect, a restricting means for restricting the rotation of the locking rings 72, 122, 130 which is not based on the operation of the operating member may be provided. When such a regulatory means is provided, the locking rings 72, 122, and 130 are made to rotate by swinging off the urging force by the urging member by exerting an operating force exceeding the urging force on the operating member. The 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 piercing device 10 of the first embodiment, the erroneous operation prevention mechanism (the first passage groove 76 of the locking ring 72, the first guide groove 44 of the housing mouth 24, and the reuse prevention protrusion 58 of the lancet hub 50) is used. ), The rotation of the locking ring 72 was prevented in the standard state and when the needle cap 18 was threaded. The contact between the 84, 84 and the outer peripheral side convex portions 88, 88) can also exert the effect of preventing the locking ring 72 from rotating in the standard state or when the needle cap 18 is threaded. Further, also in the second and third embodiments, the effect of preventing the locking rings 72 and 122 from rotating is exhibited in the standard state and when the needle cap 18 is threaded by the regulatory means provided separately from the erroneous operation prevention mechanism. Can be done. However, the regulatory means according to the present invention only needs to exhibit the effect of preventing the locking ring from rotating, at least in the puncture ready state (that is, under the state where the locking ring 72 is allowed to rotate), and is in the standard state. It is not necessary to exert the effect of preventing rotation when the needle cap 18 is threaded.

10,100: Disposable type 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 protrusion, 72, 122, 130: Locking ring, 84: Inner peripheral side convex part (contact part), 88: Outer peripheral convex portion (contact portion), 126: inclined surface (axially opposed surface, abutting portion), 128: inclined surface (axial front surface), 135: axial rear end surface (axial rear surface) 136 : Axial convex part (contact part)

Claims (9)

In a disposable puncture device in which a lancet housed in a housing is urged by a spring member and a puncture body provided at the tip of the lancet is punctured by protruding from the housing.
A locking ring is disposed in the housing so that the lancet can be displaced in the protruding direction through the locking ring.
A locking protrusion is provided on the lancet, and 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. While it is supposed to be
An operating member is provided which releases the locking of the locking protrusion to the locking ring by rotating the locking ring and displaces the lancet in the protruding direction with the spring member to operate the puncture. And then,
A regulatory means that regulates the rotation of the locking ring that is not based on the operation of the operating member by exerting resistance on the rotation of the locking ring while the rotation of the locking ring is permitted. As well as being provided
At least one of the housing and the lancet is provided with a contact portion between the locking ring and the locking ring, which causes resistance by contact in the direction of rotation during relative rotation, depending on the contact portion. A disposable piercing device, characterized in that the regulatory means is configured . According to claim 1, the restricting means is configured by providing the contact portion on the inner peripheral surface where the locking ring and the housing that rotatably supports the locking ring face each other in the radial direction. Disposable type piercing device described. The housing includes a housing body and a housing mouth body provided on the tip end side of the housing body, and the housing mouth body 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 to the support cylinder portion, and the contact portion is provided between the support cylinder portion and the locking ring in the radial direction. Mold piercing device. The outer peripheral surface of the support cylinder portion is provided with an inner peripheral side convex portion extending in the axial direction, and the inner peripheral surface of the locking ring is provided with an outer peripheral side convex portion extending in the axial direction. When the ring is rotated relative to the support cylinder portion in the circumferential direction, the inner peripheral side convex portion and the outer peripheral side convex portion come into contact with each other, thereby exerting resistance to the rotation of the locking ring with respect to the housing. 3. The contact portion is configured to allow the locking ring to rotate based on the operation of the operating member by allowing the inner peripheral side convex portion and the outer peripheral side convex portion to get over each other. Disposable type piercing device described. The fourth aspect of claim 4, wherein the inner peripheral side convex portion and the outer peripheral side convex portion are provided at a plurality of positions corresponding to each of the support cylinder portion and the locking ring in the circumferential direction at equal intervals in the circumferential direction. Disposable type piercing device. The abutment between the axially front surface of the locking ring and the axially opposed surface of the locking ring facing the axially front surface of the locking ring in the housing that rotatably supports the locking ring. The disposable piercing device according to claim 1, wherein the regulatory means is configured by providing a portion. On the axially facing surface of the housing, there is a contact portion that abuts on 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 the corresponding contact portion against the urging force of the spring member exerted by the lancet locked to the locking ring. The disposable piercing device according to claim 6, wherein the locking ring is allowed to move backward in the axial direction. A claim in which the regulatory means is configured by providing the abutting portion between the axial rear surface of the locking ring and the locking projection of the lancet locked to the locking ring. Item 1. Disposable type piercing device according to Item 1. An axially convex portion is provided on the axially rear surface of the locking ring to form the abutting portion, and the lancet is said to have the relative rotation of the locking ring in the circumferential direction with respect to the housing. The locking protrusion and the axially convex portion of the locking ring abut against each other to resist the rotation of the locking ring, and the lancet is rearward against the urging force of the spring member. The disposable piercing device according to claim 8, wherein the locking ring is allowed to rotate based on the operation of the operating member by moving to and escaping the axially convex portion of the locking ring.

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