JP6252981B2 - Lancet and puncture device including the same - Google Patents

Description

  The present invention relates to a lancet provided with a puncture body for puncturing the skin and collecting a small amount of blood, and a puncture device for puncturing the lancet. In particular, the disposable lancet is used repeatedly by exchanging the lancet. It is related with the puncture device made possible.

  Sometimes it is necessary to collect a small amount of blood for medical purposes. For example, a diabetic patient needs to collect his / her own blood in order to regularly check the blood glucose level (blood glucose self-measurement: SMBG). Conventionally, a puncture device has been used so that such blood self-collection can be performed safely and reliably.

  Such a puncture device is generally configured to puncture a puncture body provided at the tip of the lancet by projecting it from the housing by urging a lancet accommodated in the housing with a spring member. Specifically, for example, by inserting and pushing the lancet through the front end opening of the housing, the spring member disposed at the back of the housing is compressed and deformed. The urging force protrudes from the housing and is punctured.

  By the way, the lancet before use protects the puncture body from contamination by germs and keeps it clean, and the sharp tip of the puncture body is covered with a cap so that fingers and the like are not accidentally injured by the puncture body during handling. Covered. There are various types of caps. For example, as shown in FIG. 2 of Japanese Patent Laid-Open No. 2008-307423 (Patent Document 1), the cap is fixed to the proximal end portion of the puncture needle (20). A cover part (22) formed integrally with the holding part (21) covers the tip of the puncture needle, and is provided at the boundary between the holding part and the cover part by pulling forward in the puncture direction while rotating the cap part (12). By breaking the fragile notch portion (23), the cover portion is separated and removed from the holding portion, and the tip of the puncture needle is exposed.

  However, in the structure of Patent Document 1, in order to break the fragile part (13) and the notch part, the fragile part and the notch part are further weakened by twisting the cap part greatly, and the tensile force in the puncture direction is increased. In addition to this, it is necessary to tear, and the work for exposing the needle tip becomes complicated. In addition, in order to prevent unintentional breakage, the brittle part and the notch part also need a certain degree of strength, which may require a large tensile force to break.

  Therefore, in Japanese Patent No. 5028414 (Patent Document 2), as shown in FIG. 7 of Patent Document 2, the protective cap (202a) is rotated relative to the lancet body (203a), thereby connecting the connecting portion. A tensile force is applied to (302a) so that the connecting portion is broken. That is, the claw (303a) provided on the protective cap moves in the circumferential direction and is guided by the slope (402a) provided on the puncture holder (201a), so that the claw (303a) is not only in the circumferential direction but also outward in the axial direction. Also, a component force in the direction of pulling away from each other is exerted between the protective cap and the lancet body (connecting portion). Thereby, in patent document 2, a user should just apply rotational force, without applying tensile force, and isolation | separation of a protective cap and a lancet main body is implement | achieved easily.

  However, in the structure of Patent Document 2, it is assumed that the protective cap is rotated in one specific circumferential direction, and it is clear from the fact that the reverse rotation is prevented by the marking (206a) and the reverse rotation prevention rib (403a). Thus, reverse rotation is not assumed as a normal usage. Therefore, depending on the user's dominant hand, the rotation operation of the protective cap becomes unnatural, and the user may feel stress. Further, in the state where the protective cap and the puncture holder are assembled, the claw and the slope are separated in the circumferential direction, and a tensile force is applied from the place where the protective cap is rotated until the claw and the slope come into contact with each other. For this reason, the rotational operation amount required in the circumferential direction for removing the protective cap is large, and the work is troublesome.

  In Patent Document 2, it is described that the protective cap can be removed even when the protective cap is forcibly reversely rotated, but it is necessary to rotate over the reverse rotation prevention rib or slope, Unnecessary force is required for the rotation operation. Moreover, in reverse rotation, there is also a problem that the connecting portion must be twisted more in the circumferential direction in order to break the connecting portion and separate the protective cap from the lancet body.

JP 2008-307423 A Japanese Patent No. 5028414

  The present invention has been made in the background of the above-mentioned circumstances, and its solution is a lancet with a novel structure in which the cap can be quickly removed even if twisted to any side in the circumferential direction. And providing a puncture device using the same.

  Hereinafter, the aspect of this invention made | formed in order to solve such a subject is described. In addition, the component employ | adopted in each aspect as described below is employable by arbitrary combinations as much as possible.

That is, according to the first aspect of the present invention, a hub that covers the proximal end portion of the puncture body and a cap that covers the distal end portion of the puncture body are formed, and the puncture body covered with the hub and the cap is formed. In the lancet that is accommodated in the protector and the hub is held by the protector, one of the cap and the protector has a first inclined surface, and the other of the cap and the protector has the first inclined surface . the first inclined surface and abutment exerting a tensile force between the hub and the cap is also provided by the relative rotation of the contact with the circumferential direction either direction, and, in the cap A lid portion is provided to cover the front end opening of the protector, and the lid portion is provided with a fitting convex portion projecting inward of the protector, and a projecting tip surface of the fitting convex portion Said first One of the slope and the contact portion is set, and the protector is provided with a fitting recess that opens toward the tip, and the bottom surface of the fitting recess corresponds to the first inclined surface. Either one of the contact portions is set, and the outer peripheral surface of the fitting convex portion and the inner peripheral surface of the fitting concave portion are fitted and locked to position the cap and the protector in the direction perpendicular to the axis. It is characterized in that the positioning means is configured .

  According to the lancet having the structure according to the first aspect, the hub and the cap held by the protector are twisted off by simply rotating the cap relative to the protector in the circumferential direction. A tensile force is exerted between the caps to detach the cap from the hub. Thereby, the cap can be removed from the tip of the puncture body by a simple rotation operation, and the puncture body can be easily shifted to a standby state in which puncture is possible.

Furthermore, since the tensile force acting between the cap and the hub is effectively generated regardless of the circumferential direction of the relative rotation of the cap and the protector, the rotation operation is performed regardless of the user's dominant hand. Cap removal is easy.
Furthermore, according to this aspect, the fitting convex portion is fitted into the fitting concave portion when the cap and the protector are assembled, whereby the positioning means for positioning the cap and the protector in the direction perpendicular to the axis is configured. The hub can be easily assembled at the desired relative position with respect to the protector. Further, when the cap and the protector are rotated relative to each other, the first inclined surface and the abutting portion are relatively rotated while being relatively positioned in the direction perpendicular to the axis by the positioning means. The force is exerted stably and the cap can be removed reliably.

  According to a second aspect of the present invention, in the lancet described in the first aspect, the first inclined surface is provided symmetrically on both sides in the circumferential direction with respect to a reference position set on the circumference. The contact portion is provided symmetrically on both sides in the circumferential direction with respect to the reference position.

  According to the second aspect, even if the cap and the protector are rotated relative to each other in the circumferential direction from the reference position, substantially the same tensile force is generated. Therefore, the cap is removed from the hub regardless of the rotation direction. It can be pulled away and removed from the tip of the puncture body.

  According to a third aspect of the present invention, in the lancet described in the first or second aspect, the contact portion is configured by a second inclined surface corresponding to the first inclined surface. The first inclined surface and the second inclined surface are brought into contact with each other by rotation in any of the circumferential directions so that a tensile force is applied between the cap and the hub.

  According to the third aspect, with a simple structure, the cap can be pulled away from the hub and the puncture body by generating a tensile force when the cap and the protector are rotated relative to each other. Moreover, for example, by making the first inclined surface and the second inclined surface abut in advance, the relative orientation of the cap and the protector can be specified, and the cap and the protector can be easily assembled in a predetermined orientation. .

  According to a fourth aspect of the present invention, in the lancet described in the third aspect, each of the first inclined surface and the second inclined surface spreads on a single inclined plane.

  According to the fourth aspect, with a simpler structure, a tensile force can be obtained during relative rotation of the cap and the protector, and the cap can be removed from the hub and the puncture body.

A fifth aspect of the present invention, in the lancet described in the first to fourth any one embodiment, the said cap and said lid portion is provided to cover the front end opening of the protector, the lid portion Is provided with a marking portion indicating that the rotation direction of the cap with respect to the protector is on both sides in the circumferential direction.

According to the fifth aspect, by indicating in an easy-to-understand manner to the user by the marking portion that the cap can be removed even if the relative rotation is performed in any direction in the circumferential direction, the circumferential direction is easy for the user to operate. The cap can be easily removed from the hub and the puncture body by turning.

According to a sixth aspect of the present invention, in the lancet described in any one of the first to fifth aspects, rotation limiting means for relatively positioning the cap and the protector in the circumferential direction is provided. It is.

According to the sixth aspect, since the unintended relative rotation of the cap and the protector is prevented by the rotation limiting means, the tip of the puncture body is covered with the cap before intentionally removing the cap. It is securely held in a protected state.

According to a seventh aspect of the present invention, in the lancet described in any one of the first to sixth aspects, a fragile portion is provided at a boundary portion between the hub and the cap.

According to the 7th aspect, a weak part is provided in the boundary part of a hub and a cap, A weak part can be fractured | ruptured by comparatively small tensile force, and a cap can be removed from a hub and a puncture body. The fragile portion is realized by, for example, partial thinning or perforated cuts.

An eighth aspect of the present invention is a puncture device in which a separate lancet is detachably attached to a puncture device body having a housing, and the lancet is described in any one of claims 1 to 7 . And a spring member for urging the puncture body of the lancet in the puncture direction is disposed in the housing of the puncture device main body, and the puncture body is separated from the housing by the urging force of the spring member. It is characterized by projecting in the puncture direction.

According to the puncture device having the structure according to the eighth aspect, with the lancet protector attached to the puncture device body, the cap and the puncture device body are relatively rotated, so that the cap can be easily removed, A punctureable standby state in which the tip of the puncture body is exposed can be achieved.

  According to the present invention, the cap and the protector are provided with each of the first inclined surface and the contact portion, and the cap and the protector are rotated relative to each other in the circumferential direction, so that the first inclined surface and the contact portion are contacted. The contact portion comes into contact, and a tensile force that pulls them apart from each other acts between the cap and the hub. Therefore, the tip of the puncture body can be exposed by easily pulling the cap away from the hub held by the protector simply by twisting the cap and the protector and rotating them relative to each other.

  Moreover, since the tensile force is generated even if the cap and the protector are rotated relative to each other in the circumferential direction, the cap and the protector can be operated in an easy-to-operate direction according to the user's dominant hand. The cap can be easily removed.

The perspective view which shows the lancet as one Embodiment of this invention. The figure which shows the internal structure of the lancet shown in FIG. The disassembled perspective view of the lancet shown in FIG. The top view of the lancet shown in FIG. The front view of the lancet shown in FIG. VI-VI sectional drawing of FIG. The top view of the lancet main body which comprises the lancet shown in FIG. The bottom view of the lancet main body shown in FIG. The front view of the lancet main body shown in FIG. The rear view of the lancet main body shown in FIG. The figure explaining the removal operation | movement of the cap in the lancet shown in FIG. 1 in steps. The perspective view which shows the puncture device provided with the lancet shown in FIG. The top view of the puncture device shown in FIG. The front view of the puncture device shown in FIG. Sectional drawing which shows the internal structure of the puncture device shown in FIG. The disassembled perspective view of the puncture apparatus main body which comprises the puncture device shown in FIG. It is a longitudinal cross-sectional view explaining the usage method of the puncture device shown in FIG. 13, Comprising: The figure which shows the state before mounting | wearing a puncture apparatus main body with a lancet. It is a longitudinal cross-sectional view explaining the usage method of the puncture device shown in FIG. 13, Comprising: The figure which shows the process of mounting | wearing a puncture apparatus main body with a lancet. It is a longitudinal cross-sectional view explaining the usage method of the puncture device shown in FIG. 13, Comprising: The figure which shows the puncture standby state which mounted | wore the puncture apparatus main body with the lancet. It is a longitudinal cross-sectional view explaining the usage method of the puncture device shown in FIG. 13, Comprising: The figure which shows the state which removed the cap from the hub. It is a longitudinal cross-sectional view explaining the usage method of the puncture device shown in FIG. 13, Comprising: The figure which shows the moment of puncture. It is a longitudinal cross-sectional view explaining the usage method of the puncture device shown in FIG. 13, Comprising: The figure which shows the state in which the puncture needle was accommodated in the protector after puncture. It is a longitudinal cross-sectional view explaining the usage method of the puncture device shown in FIG. 13, Comprising: The figure which shows the process of removing a used lancet from a puncture apparatus main body.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 shows a lancet 10 as one embodiment of the present invention. The lancet 10 is configured by combining a lancet body 12 and a protector 14 as shown in FIGS. In the following description, unless otherwise specified, the axial direction refers to the left-right direction in FIG. 4 which is the central axis direction of the lancet 10, and the protruding direction of the puncture needle 16 (puncture direction) in the puncture device 70 described later. The left side in FIG. 4 is called the front and the right side is called the rear.

  More specifically, as shown in FIGS. 2, 3 and FIGS. 6 to 10, the lancet body 12 has a puncture needle 16 as a puncture body formed by a hub 18 and a cap 20 that are integrally formed of a resin. The structure is covered.

  The hub 18 is fixed to the proximal end portion of the puncture needle 16 and projects rearward from the puncture needle 16. Furthermore, an annular connecting groove 22 that opens to the outer peripheral surface is formed at the rear end of the hub 18.

  Further, the hub 18 is provided with a pair of elastic locking pieces 24, 24. The elastic locking piece 24 has a longitudinal plate shape as a whole, extends vertically from the vicinity of the front end of the hub 18, and is curved and protrudes rearward. Further, the elastic locking piece 24 is gradually inclined to the upper and lower outer sides toward the rear, and in this embodiment, the front end portion serving as the base end is curved in a substantially arc shape in the thickness direction, The rear end portion is an inclined flat plate shape. In the present embodiment, the pair of elastic locking pieces 24, 24 are provided above and below the hub 18, so that the elastic locking pieces 24, 24 are evenly arranged on the circumference of the hub 18.

  Furthermore, an engaging portion 26 that protrudes upward and downward is integrally formed at the rear end of the elastic locking piece 24. The engaging portion 26 has a front surface that extends in a direction substantially perpendicular to the axis, and a rear surface that is inclined so as to incline backward toward the upper and lower outer sides.

  The cap 20 covers the distal end portion of the puncture needle 16 and is integrally formed with the hub 18 via the fragile portion 28. The fragile portion 28 is provided at the boundary between the hub 18 and the cap 20, and is partially thin and small in diameter by an annular groove opened on the outer peripheral surface. When an external force is applied when removing the cap 20, stress is concentrated. Therefore, it breaks preferentially. The fragile portion 28 is located behind the tip of the puncture needle 16, and the puncture needle 16 protruding from the hub 18 passes through the fragile portion 28 and reaches the cap 20.

  Further, a closing portion 30 as a lid portion having a large-diameter disk shape is provided at the distal end portion of the cap 20, and a pair of substantially semicircular disks are axially disposed on the distal end side of the closing portion 30. A grip portion 32 having a combined shape so as to form a cross when viewed is integrally formed. Further, the grip portion 32 is integrally formed with an arrow 34 as a marking portion extending in the circumferential direction. The arrows 34 are respectively formed between the circumferential directions of the four plate portions constituting the grip portion 32, and indicate that the cap 20 may be rotated in any circumferential direction when the cap 20 described later is removed. Therefore, arrows 34a and arrows 34b opposite to each other are alternately arranged on the circumference.

  Further, a fitting projection 36 that protrudes rearward is formed on the closing portion 30 of the cap 20. The fitting convex portion 36 has a substantially cylindrical shape, and is a first inclined surface 38 whose protruding front end surface (rear end surface) is inclined with respect to the direction perpendicular to the axis. The first inclined surface 38 is configured by a flat surface that is inclined substantially uniformly as a whole, and the rear end portion of the cap 20 having a small diameter is directed rearward from the central portion of the first inclined surface 38. It protrudes. In addition, the position where the protrusion dimension of the fitting convex part 36 becomes the maximum on the periphery of the 1st inclined surface 38 is made into the reference position A (refer FIG. 6), and the 1st inclined surface 38 is the reference | standard. The position A is provided symmetrically on both sides in the circumferential direction.

  Furthermore, a support piece 40 is formed integrally with the closing portion 30 of the cap 20. The support piece 40 protrudes rearward from a part of the circumference of the closing portion 30 and gradually becomes narrower in the circumferential direction toward the protruding tip. A locking claw 42 that protrudes inward in the direction perpendicular to the axis is integrally formed at the protruding tip portion of the support piece 40. The locking claw 42 has a projecting tip surface inclined inward toward the front, the projecting dimension gradually increases toward the front, and the front end surface expands in a direction substantially perpendicular to the axis.

  A protector 14 is attached to the lancet body 12 having such a structure in an extrapolated state. The protector 14 has a substantially cylindrical shape as a whole, and the rear end portion is divided into four parts by forming four cuts 44 extending in the axial direction at equal intervals on the circumference. Further, a positioning projection 46 that protrudes to the outer peripheral side is continuously provided over the entire circumference in the axially intermediate portion of the protector 14. Further, behind the positioning protrusions 46 in the protector 14, guide protrusions 48 that protrude outward and extend in the axial direction are formed at four locations on the periphery.

  A pair of first locking holes 50 and second locking holes 52 are formed behind the positioning protrusions 46 in the protector 14. The first locking hole 50 and the second locking hole 52 are rectangular holes having substantially the same shape and opening in the peripheral wall of the protector 14, and are arranged at a predetermined distance in the axial direction. The locking hole 52 is located in front of the first locking hole 50. Further, the pair of first locking holes 50, 50 and the pair of second locking holes 52, 52 are formed at positions facing each other in the radial direction, and the lancet body 12 described later is attached to the protector 14. In the state, the first and second locking holes 50 and 52 are arranged at positions corresponding to the elastic locking pieces 24 on the circumference. In addition, the inner surface of the second locking hole 52 is configured by an inclined surface in which a portion located at the rear is gradually inclined forward toward the inner peripheral side. The first locking hole 50 and the second locking hole 52 are formed between the circumferential directions of the guide protrusions 48 adjacent in the circumferential direction.

  Further, a restriction projection 54 is formed between the first locking hole 50 and the second locking hole 52 in the axial direction so as to protrude toward the inner peripheral side. The restricting protrusion 54 is a protrusion whose protruding height gradually increases toward the front, and both the front surface and the inner peripheral surface are gradually inclined toward the inner peripheral side toward the front. Further, the front surface of the restricting protrusion 54 is continuous with the rear inner surface of the second locking hole 52, and in the present embodiment, these surfaces are configured by a single inclined plane. The protruding height of the restricting protrusion 54 is set in consideration of the elasticity of the elastic locking piece 24, the moving speed of the lancet body 12 at the time of puncturing, the axial dimension of the second locking hole 52, and the like. It is desirable that the engaging portion 26 that has overcome the restricting projection 54 can move forward without entering the second locking hole 52 during the puncturing operation of the puncture device 70 described later.

  Further, the protector 14 is formed with a fitting window 56 having a shape corresponding to the first locking hole 50. The fitting window 56 is formed on the substantially same circumference as the first locking hole 50 and at a position away from the first locking hole 50, and is opposed to the pair of first locking holes 50, 50. A pair is arrange | positioned so that it may oppose in the radial direction one direction substantially orthogonal to a direction.

  Further, a locking hole 58 is formed in the front end portion of the protector 14. The locking hole 58 is open on the outer peripheral surface of the protector 14 and is formed in a part of the periphery in front of the positioning projection 46. Further, the locking hole 58 has a shape substantially corresponding to the locking claw 42 of the cap 20, and the bottom surface is inclined inwardly inward of the axis toward the front, so that the depth gradually increases toward the front. Is getting bigger.

  Further, a fitting recess member 60 as a fitting recess is disposed at the front end portion of the protector 14. The fitting concave member 60 has a concave shape opening toward the front, and is fixed by means such as welding or adhesion while being inserted into the front end of the protector 14, so that substantially the protector 14. Part of it. Further, a hole through which the rear end portion of the cap 20 having a small diameter is inserted is formed in the bottom wall portion of the fitting recess member 60 so as to penetrate in the front-rear direction.

  Furthermore, the bottom inner surface of the fitting recess member 60 is a second inclined surface 62 as a contact portion. The second inclined surface 62 has a shape corresponding to the first inclined surface 38 of the cap 20 and is entirely formed as a single inclined plane. The reference position of the first inclined surface 38 on the circumference is the same. The positions corresponding to A are provided symmetrically on both sides in the circumferential direction.

  Then, the lancet body 12 is inserted into the protector 14, the fitting convex part 36 of the cap 20 is fitted into the fitting concave part 60 of the protector 14, and the engaging part 26 of the elastic locking piece 24 is fitted. The first locking hole 50 is inserted and locked. Thereby, the lancet body 12 including the puncture needle 16 is positioned and held at the initial position behind the protector 14 in the puncture direction, and the lancet 10 is configured. Note that the front end opening of the protector 14 is covered with a closing portion 30 of the cap 20.

  Further, the engaging portion 26 is locked to the inner peripheral surface of the first locking hole 50 by inserting the engaging portion 26 of the elastic locking piece 24 into the first locking hole 50 of the protector 14. Thus, the hub 18 is positioned relative to the protector 14 in the circumferential direction, and relative rotation of the hub 18 with respect to the protector 14 is prevented.

  Further, the outer peripheral surface of the fitting convex portion 36 and the inner peripheral surface of the fitting concave portion 60 are fitted together and locked in the direction perpendicular to the axis, whereby the cap 20 and the protector 14 are relatively positioned in the direction perpendicular to the axis. Positioning means is configured. Thereby, the cap 20 is guided in the axial direction by the positioning means with respect to the protector 14, and can be easily assembled.

  Furthermore, the locking claw 42 of the cap 20 is fitted into the locking hole 58 of the protector 14 and is held by the elasticity of the support piece 40. Thereby, even if a forward axial force is exerted on the cap 20, the locking claw 42 is locked to the inner surface of the locking hole 58 in the axial direction, whereby the cap 20 is torn off from the hub 18 and separated. Is prevented. Further, when the locking claw 42 is locked to the inner surface of the locking hole 58 in the circumferential direction, the cap 20 is positioned relative to the protector 14 in the circumferential direction, and the relative rotation between the cap 20 and the protector 14 is increased. The movement is restricted, and thus the rotation restricting means in this embodiment is configured.

  When the lancet main body 12 and the protector 14 are positioned and held at the initial positions, the puncture needle 16 and the hub 18 of the lancet main body 12 are both accommodated on the inner peripheral side of the protector 14 over substantially the entire length. Preferably, in the lancet body 12, at least the tip of the puncture needle 16 is always accommodated in the inner periphery of the protector 14, and the connecting groove 22 of the hub 18 is always accommodated in the inner periphery of the protector 14. The puncture needle 16 and the hub 18 are always accommodated in the protector 14 over substantially the entire length.

  As shown in FIG. 11, the lancet 10 having such a structure is configured such that the distal end portion of the puncture needle 16 is exposed to the outside by removing the cap 20 from the hub 18 before use.

  That is, in the lancet 10 shown in FIG. 11A, when the cap 20 is rotated relative to the protector 14 in the circumferential direction as shown in FIGS. The first inclined surface 38 rotates relative to the second inclined surface 62 of the fitting recess member 60 attached to the protector 14 in the circumferential direction while being in contact with the second inclined surface 62. Thereby, the maximum protrusion (reference position A) of the fitting protrusion 36 moves in the circumferential direction while contacting the second inclined surface 62, and the reference position A is displaced forward in the axial direction. An axial tensile force is exerted between the cap 20 and the hub 18.

  In the present embodiment, the first inclined surface 38 and the second inclined surface 62 are inclined planes corresponding to each other, and are overlapped with each other. Even if the relative rotation is performed in the direction, the reference position A of the first inclined surface 38 slides in the circumferential direction while contacting the second inclined surface 62. Thereby, even if the cap 20 is rotated relative to the protector 14 in any circumferential direction, the same tensile force is exerted between the cap 20 and the hub 18.

  For example, the cap 20 and the protector 14 can be obtained by gripping the gripping portion 32 of the cap 20 with one hand and gripping a puncture device main body 72 (described later) holding the protector 14 with the other hand and twisting them together. Can be rotated relative to each other. Further, the locking claw 42 of the cap 20 is inserted into the locking hole 58 of the protector 14 and locked in the circumferential direction, but the cap 20 and the protector 14 are twisted by hand to apply a circumferential external force. As a result, the support piece 40 is elastically deformed to the outer peripheral side, and the locking claw 42 comes out of the locking hole 58, so that the locking of the locking claw 42 and the locking hole 58 is easily released. ing.

  Further, a weakened portion 28 having a locally small diameter is provided at the boundary between the cap 20 and the hub 18, and when the cap 20 and the hub 18 are relatively twisted, stress concentrates on the weakened portion 28, As shown in FIG. 11 (e), the fragile portion 28 is preferentially broken. Then, by pulling forward the cap 20, which is the tip side of the broken weak part 28, the tip portion of the puncture needle 16 covered with the cap 20 protrudes from the front end of the hub 18, and the inner periphery of the protector 14. Exposed to space. In the state where the cap 20 is removed, the puncture needle 16 is accommodated on the inner peripheral side of the protector 14, and the user can be prevented from touching the tip of the puncture needle 16 by mistake.

  Although the removal of the cap 20 has been described here as a single unit of the lancet 10, in actual use, the cap 20 can be removed after the lancet 10 is set on the puncture device main body 72, which will be described later, as will be described later. .

  As described above, according to the lancet 10 having the structure according to the present embodiment, the cap 20 and the hub 18 are simultaneously twisted by simply rotating the cap 20 relative to the protector 14, and at the same time, the cap 20 and the hub 18. In the meantime, an axial tensile force is also applied to separate the cap 20 from the hub 18. Therefore, there is no need to apply a complicated force such as pulling while twisting, and the cap 20 can be easily removed.

  Moreover, since the axial tensile force acting between the cap 20 and the hub 18 is obtained by sliding contact between the first inclined surface 38 and the second inclined surface 62, the first and second inclined surfaces 38 are provided. , 62 can be appropriately set to obtain a tensile force necessary for removing the cap 20. Therefore, it is possible to avoid such a problem that the fragile portion 28 is not broken because the tensile force is too small, or the engaging portion 26 of the elastic locking piece 24 is detached from the first locking hole 50 because the tensile force is too large. Is done.

  Further, since the first and second inclined surfaces 38 and 62 are inclined planes corresponding to each other, even if the cap 20 and the protector 14 are relatively rotated in any circumferential direction, the tensile force is similarly applied. The cap 20 can be removed by twisting in an arbitrary rotation direction. In addition, in the present embodiment, since the first and second inclined surfaces 38 and 62 are in contact with each other in advance, the tensile force in the axial direction is increased from the stage where the relative rotation amount of the cap 20 and the protector 14 is small. The cap 20 can be separated from the hub 18 with a small force. In the initial state before the cap 20 is rotated relative to the protector 14, the first and second inclined surfaces 38 and 62 may face each other with a gap.

  In addition, the cap 20 of this embodiment is formed with an arrow 34a indicating rotation in one circumferential direction and an arrow 34b indicating rotation in the other circumferential direction. It is possible to visually grasp that any direction may be twisted.

  Furthermore, the protruding front end surface of the fitting convex portion 36 is a first inclined surface 38, the bottom inner surface of the fitting concave portion 60 is a second inclined surface 62, and the fitting convex portion 36 is The fitting recess 60 is fitted. Thereby, when the cap 20 and the protector 14 are rotated relative to each other, the first inclined surface 38 and the second inclined surface 62 are relatively positioned in the direction perpendicular to the axis, and are stably slid in the circumferential direction. The Therefore, the predetermined tensile force is stably exerted, and the cap 20 can be removed from the hub 18.

  Further, in the lancet body 12 of the present embodiment, a fragile portion 28 having a locally small diameter is formed at the boundary between the cap 20 and the hub 18, and stress is concentrated on the fragile portion 28 when a tensile force is applied. Thus, it is efficiently broken.

  In addition, since the locking claw 42 of the cap 20 is inserted into the locking hole 58 of the protector 14 and locked in the circumferential direction, the rotation limiting means is configured. In order to remove the cap 20 Unless an external force is intentionally applied, relative rotation of the cap 20 with respect to the protector 14 is prevented, and separation of the cap 20 from the hub 18 can be avoided. In order to effectively prevent unintentional separation of the cap 20 by the rotation restricting means, in order to release the locking claw 42 and the locking hole 58, the cap 20 is initially rotated relative to the protector 14. It is desirable that greater force is required.

  The lancet 10 having such a structure constitutes a puncture device 70 as shown in FIGS. The puncture device 70 has a structure in which the lancet 10 is detachably attached to the puncture device main body 72.

  More specifically, the puncture device main body 72 shown in FIGS. 12 to 15 includes a housing 74, and the housing 74 includes a housing main body 76 and a protector holder 78. The housing body 76 is a substantially cylindrical member made of a hard resin molded product, and an operation window 80 is opened on the peripheral wall. In addition, as shown in FIG. 16, the housing main body 76 of this embodiment combines a pair of substantially halved bodies, and these halves are fixed to each other by means of ultrasonic welding or the like. It is formed with.

  As shown in FIG. 16, the protector holder 78 is a substantially cylindrical part made of a resin molded product, and an opening locking portion 82 that protrudes to the outer periphery is integrally formed at the front end. Furthermore, four guide grooves 84 extending continuously in the axial direction are formed on the inner peripheral surface of the protector holder 78, and are arranged uniformly on the circumference.

  Further, four flexible pieces 86 are formed on the circumferential wall portion of the protector holder 78 at equal intervals on the circumference. The flexible piece 86 has a substantially rectangular plate shape, and one front side is integrally connected to the peripheral wall of the protector holder 78, and the other three sides are independent from the peripheral wall of the protector holder 78 by cutting. . Accordingly, the rear end portion of the flexible piece 86 can be moved to the outer peripheral side with deformation, and the flexible piece 86 is allowed to bend and deform toward the outer peripheral side.

  Furthermore, the engaging protrusion 88 is formed in the flexible piece 86 of the protector holder 78, respectively. The engaging convex portion 88 is a protrusion that protrudes toward the inner periphery of the protector holder 78, and extends with a predetermined width in the circumferential direction of the protector holder 78 with a substantially constant semicircular cross section. The engaging projection 88 is integrally formed at the rear end of the flexible piece 86, and the protruding tip of the engaging projection 88 moves in the radial direction of the protector holder 78 due to the bending deformation of the flexible piece 86. It is possible.

  The protector holder 78 is accommodated in the front opening portion of the housing body 76. That is, a pair of support protrusions 90, 90 projecting from the outer peripheral surface of the protector holder 78 are inserted into support recesses 92, 92 formed on the inner peripheral surface of the housing body 76, and the opening of the protector holder 78 is engaged. The protector holder 78 is positioned and held in the opening portion of the housing body 76 by the stop portion 82 being superimposed on the opening end surface of the front side of the housing body 76. As described above, the protector holder 78 is attached to the opening portion of the housing body 76, whereby the housing 74 of the present embodiment is configured.

  Further, in a state where the protector holder 78 is attached to the housing body 76, the rear end portion of the flexible piece 86 including the engaging convex portion 88 is against the relief recess 94 that opens on the inner peripheral surface of the housing body 76. The flexible piece 86 is allowed to be deformed toward the outer peripheral side.

  The housing 74 accommodates an output rod 96 as an output member. The output rod 96 has a substantially cylindrical shape as a whole, and has a bifurcated shape in which a front portion is divided into upper and lower portions (up and down in FIG. 6) by a slit 98. Further, a first locking projection 100 and a second locking projection 102 are formed at a front portion of the bifurcated output rod 96 at a predetermined distance in the axial direction. Each of the first and second locking protrusions 100 and 102 has a substantially right-angled triangular cross section, the front surface extends in a direction substantially perpendicular to the axis, and the rear surface extends inwardly toward the rear. . In the present embodiment, the pair of first and second lock protrusions 100 and 102 of the output rod 96 are formed so as to protrude vertically, and when the output rod 96 is housed in the housing 74, the output rod 96 Although it is not necessary to specify the up and down direction of 96 and the assembling work is facilitated, for example, the lower first and second lock protrusions 100 and 102 can be omitted.

  Further, a pair of connecting convex portions 104 and 104 are provided at the front end of the output rod 96. The connecting convex portions 104 and 104 protrude in a vertically-inwardly facing manner at the front end of the bifurcated output rod 96, and have a curved shape in which the front end portion is inclined upward and downward outward.

  Furthermore, a rod contact portion 106 is provided behind the connecting convex portion 104 in the output rod 96. The rod abutting portion 106 is formed with a pair of vertically opposed projections at the front end portion of the bifurcated output rod 96, and a convex curved surface whose rear surface gradually inclines forward toward the projecting tip. Has been.

  On the other hand, an enlarged diameter contact portion 108 having a large diameter is provided at the rear end of the output rod 96, and an annular step is formed at the front end of the enlarged diameter contact portion 108.

  Further, the push rod 110 is inserted through the output rod 96. The push rod 110 has a substantially cylindrical shape with a small diameter, and a pair of push-out portions 112 and 112 projecting forward from both sides in the width direction (left and right direction in FIG. 5) are provided at the tip portion. It has been. The push rod 110 is inserted into the output rod 96 and protrudes rearward from the output rod 96, and the pair of pushing portions 112 and 112 protrudes laterally through the slit 98 of the output rod 96.

  Further, a puncture spring 114 as a spring member is externally inserted into the push rod 110. The puncture spring 114 is a coil spring and is externally inserted into the rear end portion of the push rod 110 protruding rearward from the output rod 96 and the front end is inserted into the diameter increasing contact portion 108 of the output rod 96. Thus, it is in contact with the output rod 96 in the axial direction.

  Further, a discharge switch 116 is attached to the rear end of the push rod 110. The discharge switch 116 has a substantially bottomed cylindrical shape, and the rear end of the push rod 110 is inserted into and fixed to the discharge switch 116. Further, the rear end of the puncture spring 114 is inserted into the discharge switch 116 and abuts in the axial direction, and the puncture spring 114 is sandwiched between the output rod 96 and the discharge switch 116 in the axial direction.

  The discharge switch 116 is inserted through the setting dial 118. The setting dial 118 has a substantially cylindrical shape as a whole. A discharge switch 116 is inserted through the rear end opening, and a front portion is inserted into the housing main body 76. Furthermore, a large-diameter engaging portion 120 that protrudes to the outer periphery is provided over the entire periphery of the setting dial 118 into the housing main body 76. The large-diameter engaging portion 120 is inserted into the engaging groove 122 opened on the inner peripheral surface of the housing main body 76 and locked in the axial direction, so that the setting dial 118 is axially moved with respect to the housing main body 76. And is supported in a state in which relative rotation is allowed. The discharge switch 116 can be moved back and forth with respect to the setting dial 118, and is prevented from slipping back in the axial direction.

  In addition, a spacer 124 is extrapolated at an intermediate portion of the output rod 96. The spacer 124 has a substantially cylindrical shape, and a flange-like spring contact portion 132 is provided at the front end portion.

  A pressing spring 138 is disposed behind the spacer 124. The pressing spring 138 is a coil spring having a diameter larger than that of the puncture spring 114, and is externally inserted at the rear end of the output rod 96 and the rear portion of the spacer 124, and the spring contact portion 132 of the spacer 124 and the discharge switch 116 is disposed in a compressed state in the axial direction with respect to 116. As a result, the spacer 124 is urged forward by the pressing spring 138 and pressed against the projecting piece 140 protruding from the inner peripheral surface of the housing main body 76 in the axial direction. It is positioned.

  The housing main body 76 is provided with a collection spring 144. The recovery spring 144 is a coil spring, and is externally inserted between the first lock protrusion 100 and the second lock protrusion 102 of the output rod 96 and formed on the inner periphery of the housing body 76. The housing portion 146 is disposed. The housing portion 146 includes a peripheral wall portion that can position the recovery spring 144 in a direction perpendicular to the axis, and front and rear support wall portions 148a and 148b having insertion holes 150 through which the output rod 96 can be inserted on both sides in the axial direction. It has. The insertion hole 150a formed through the front support wall portion 148a is not inserted through the first support wall portion 148b while the first and second lock protrusions 100 and 102 cannot pass therethrough. The second locking protrusion 102 can pass through the hole 150b.

  Further, a ring member 152 is disposed between the rear support wall portion 148 and the rear end of the recovery spring 144. The ring member 152 has a substantially annular plate shape, and is externally inserted between the first lock protrusion 100 and the second lock protrusion 102 in the output rod 96 in the axial direction. The center hole of the ring member 152 has a cross-sectional shape through which the first and second lock protrusions 100 and 102 cannot be inserted so that the second lock protrusion 102 is locked. Since the output rod 96 has a bifurcated shape at the portion where the second lock protrusions 100 and 102 are formed, the output rod 96 can be inserted into the ring member 152 by being bent so as to approach vertically. .

  An operation member 154 is attached to an operation window 80 formed in front of the housing portion 146 in the housing main body 76. The operation member 154 includes an operation button 156 exposed to the outside from the operation window 80 and a positioning piece 158 that is integrally formed with the operation button 156 and extends forward and backward. Further, the operation member 154 includes a plate-like lock piece 160. The lock piece 160 extends downward from the front portion of the operation button 156, and an intermediate portion is formed as an inclined portion 162 that is gradually inclined downward toward the rear, and both front and rear end portions are spread in a substantially axial direction. Yes. Furthermore, a contact recess 164 that opens to the lower surface at the center in the width direction is formed in the rear end portion of the inclined portion 162. The contact recess 164 is a guide surface in which the front portion of the bottom surface extends substantially in the axial direction, and the rear portion of the bottom surface gradually tilts rearward, so that the first lock protrusion 100 can be inserted. Has been.

  The operation member 154 includes a positioning piece 158 inserted through the operation window 80 and superimposed on the inner peripheral surface of the housing main body 76, and a support shaft 166 attached to the housing main body 76, and the front portion of the lock piece 160. Is supported from below. The support shaft 166 has a small-diameter columnar shape, and both end portions in the axial direction are supported by the housing body 76 and extend in the width direction. Then, the lock piece 160 of the operation member 154 is superimposed on the support shaft 166 from above, and the front end of the inclined portion 162 is supported by the support shaft 166. Accordingly, when the operation button 156 is pressed, the lock piece 160 tilts about the support shaft 166, and the rear end of the lock piece 160 is displaced upward with respect to the output rod 96. Yes. In addition, the rear end of the lock piece 160 is located between the first lock protrusion 100 and the second lock protrusion 102 in the single body of the puncture device main body 72 to which the lancet 10 is not attached, and the first lock The protrusion 100 is inserted into the contact recess 164.

  Prior to use of the puncture device 70, the lancet 10 according to the present invention is attached to the puncture device body 72 having such a structure. That is, as shown in FIG. 17, the lancet 10 is accommodated in the housing 74 by causing the lancet 10 to approach the puncture device main body 72 from the front and inserting the lancet 10 into the front end opening of the puncture device main body 72. When the lancet 10 is inserted into the distal end opening of the puncture device main body 72, the bifurcated front end of the output rod 96 is pushed open by the rear end of the hub 18 as shown in FIG. The connecting projection 104 provided at the front end is inserted into the connecting groove 22 of the hub 18 and engaged in the axial direction. Thereby, the lancet main body 12 and the output rod 96 are connected so as to move integrally in the axial direction.

  Further, by further pushing the lancet 10 rearward, as shown in FIG. 19, the output rod 96 moves rearward and the puncture spring 114 is compressed in the axial direction. Further, the first lock protrusion 100 moves while pushing up the lock piece 160 and is positioned rearward of the lock piece 160, so that the front end of the first lock protrusion 100 is relative to the rear end of the lock piece 160. And is locked in the axial direction. Thereby, the forward movement of the output rod 96 is restricted by the lock piece 160, and the puncture spring 114 is held in a compressed state. As a result, in the mounted state of the lancet 10 shown in FIG. 19, the output rod 96 and the lancet body 12 connected to the output rod 96 are held in the puncture preparation position where the forward biasing force is exerted by the elasticity of the puncture spring 114. .

  Further, the protector 14 of the lancet 10 pushes the flexible piece 86 outward as shown in FIG. 18 by abutting the rear end portion of the protector 14 with the engaging convex portion 88 provided on the protector holder 78 of the housing 74. It is inserted into the protector holder 78 while spreading. When the lancet 10 is further pushed in and the engaging convex portion 88 is moved to the opening portion of the first locking hole 50, the engaging convex portion is caused by the elasticity of the flexible piece 86 as shown in FIG. 88 enters the first locking hole 50 and is locked in the axial direction. In addition, the engaging projection 88 is inserted into the fitting window 56 and is locked in the axial direction. Thus, the protector 14 is axially positioned with respect to the protector holder 78 and attached to the housing 74.

  Furthermore, when the engaging convex portion 88 is inserted into the first locking hole 50, the engaging portion 26 of the elastic locking piece 24 is pushed into the inner peripheral side by the engaging convex portion 88 and engaged. The locking between the portion 26 and the first locking hole 50 is released. Thereby, the positioning of the lancet body 12 and the protector 14 is released, and the lancet body 12 is allowed to be displaced relative to the protector 14 in the axial direction. As is clear from this, the release protrusion of the present embodiment is constituted by the two engaging convex portions 88 and 88 inserted into the first locking holes 50 and 50.

  In the present embodiment, the guide protrusion 48 projecting from the outer peripheral surface of the protector 14 is inserted into the guide groove 84 opened in the inner peripheral surface of the protector holder 78, so that the lancet 10 is attached to the housing 74. While being positioned in the circumferential direction, it is inserted in the axial direction.

  Puncturing with the puncture needle 16 of the lancet 10 is performed in a state where the lancet 10 is mounted on the puncture device main body 72 in this way. Hereinafter, the puncturing operation of the puncture device 70 will be described with reference to FIGS.

  First, as shown in FIG. 20, in the puncture device 70 in which the lancet 10 is mounted on the puncture device main body 72, the cap 20 of the lancet main body 12 is removed from the hub 18 to expose the tip of the puncture needle 16. Accordingly, the lancet body 12 is placed in a puncture standby state in which the lancet body 12 is held at the puncture preparation position while being urged forward by the puncture spring 114.

  The method of removing the cap 20 of the lancet 10 from the hub 18 is as described above. However, the hub 18 of the lancet 10 is connected to the output rod 96 of the puncture device main body 72 and is supported so as not to rotate. The cap 20 can be rotated relative to the protector 14 and the hub 18 by grasping the grip portion 32 and rotating the cap 20 in the circumferential direction while gripping the puncture device main body 72. Then, by generating an axial component force due to the guiding action of the first inclined surface 38 and the second inclined surface 62 and applying this component force to the fragile portion 28 as an axial tensile force, the fragile portion 28. Is broken and the cap 20 is removed. In addition, when the engaging projection 88 is inserted into the first locking hole 50, the positioning of the hub 18 and the protector 14 in the axial direction between the hub 18 and the protector 14 of the lancet body 12 is released. If positioning in the circumferential direction is maintained, it is possible to more effectively prevent the hub 18 from rotating together with the cap 20 when the cap 20 is removed.

  Next, the rear end of the lock piece 160 is displaced away from the output rod 96 by pressing the operation button 156 of the operation member 154 while the tip of the lancet 10 (protector 14) is applied to the skin of the puncture portion of the patient. Thus, the engagement between the rear end of the lock piece 160 and the first lock protrusion 100 is released. As a result, as shown in FIG. 21, the output rod 96 is displaced forward based on the urging force of the puncture spring 114, and the puncture needle 16 projects forward from the distal end opening of the protector 14, and instantaneously touches the patient's skin. Is punctured.

  Further, when the output rod 96 moves forward, the ring member 152 is pressed forward by the second lock protrusion 102 of the output rod 96, and when the ring member 152 moves forward, the recovery spring 144 is compressed in the axial direction. The As a result, a rearward biasing force based on the elasticity of the recovery spring 144 is exerted on the output rod 96 during puncturing.

  When the puncturing is completed, as shown in FIG. 22, the output rod 96 is displaced rearward by the urging force of the recovery spring 144 and the puncture needle 16 is quickly accommodated in the inner periphery of the protector 14.

  In this case, the lancet body 12 is held in a reuse prevention position ahead of the initial position without returning to the initial position before puncturing. That is, when the output rod 96 and the lancet body 12 are moved rearward from the puncture position by the backward biasing force due to the elasticity of the recovery spring 144, the engagement of the elastic locking piece 24 of the lancet body 12 as shown in FIG. The joining portion 26 enters and is locked in the second locking hole 52 without returning to the first locking hole 50. As a result, the lancet body 12 is positioned and held in the axial direction with respect to the protector 14 in a state where the lancet body 12 is positioned forward compared to before the puncturing operation. In the present embodiment, the restriction projection 54 is formed between the first locking hole 50 and the second locking hole 52, and the engaging portion 26 comes into contact with the front surface of the restriction projection 54, so that the first The second locking hole 52 enters the first locking hole 50 without returning to the first locking hole 50.

  In such a reuse prevention position, the lancet body 12 and the output rod 96 connected thereto are positioned in front of the puncture front, so that the first lock protrusion 100 is in front of the rear end of the lock piece 160. positioned. In short, the output rod 96 is substantially in the same position as the single body state of the puncture device main body 72 before the lancet 10 is mounted, and the urging force by the puncture spring 114 does not act on the output rod 96. Therefore, even if the operation button 156 is pressed again after puncturing, the puncturing operation does not occur.

  Next, as shown in FIG. 23, the discharge switch 116 is pushed forward to move the push rod 110 forward relative to the output rod 96. Accordingly, the front end of the push rod 110 is inserted between the rod contact portions 106 and 106 of the output rod 96, and the front end portion of the output rod 96 is deformed so as to be separated vertically, thereby connecting the connecting convex portion 104 and the hub. The fitting with the 18 connecting grooves 22 is released.

  Further, by pushing the push rod 110 forward, the pushing portion 112 is inserted into the notch 44 of the protector 14 and is brought into contact with the rear end of the protector 14 at the portion where the notch 44 is formed. As a result, a forward force is exerted on the protector 14 to release the engagement of the engaging projection 88 with the first locking hole 50 and the fitting window 56, and the protector 14 is applied to the protector holder 78. Is pushed forward relatively. As a result, the used lancet 10 'is discharged from the lancing device body 72 and discarded. In addition, when the lancet 10 ′ is caught without being ejected from the puncture device main body 72 in a state where the protector 14 and the protector holder 78 are unlocked, the protector 14 can be picked and removed by fingers or the like. In this case as well, since the tip of the puncture needle 16 is accommodated in the protector 14, there is no possibility that the puncture needle 16 will damage a finger or the like.

  Moreover, in the puncture device 70 of this embodiment, reuse of the used lancet 10 'is prevented. That is, in the used lancet 10 ′, the engaging portion 26 of the elastic locking piece 24 is inserted into the second locking hole 52, and the lancet body 12 is in contact with the protector 14 compared to before use. It is located forward. Thereby, even if the used lancet 10 ′ is inserted from the front end opening of the puncture device main body 72 and pushed backward, the output rod 96 is moved backward to lock the front surface of the first lock protrusion 100 and the rear surface of the lock piece 160. The puncture spring 114 cannot be held in a compressed state. Therefore, the output rod 96 cannot be displaced forward by the elastic restoring force of the puncture spring 114, and the puncture operation as described above cannot be established. If the used lancet 10 ′ is mistakenly attached to the puncture device main body 72, the used lancet 10 ′ can be detached from the puncture device main body 72 by pushing the discharge switch 116.

  Thus, according to the puncture device 70 of the present embodiment, the relative position between the lancet body 12 and the protector 14 changes before and after the puncture, and the used lancet 10 ′ is replaced with the puncture device. It is impossible to set the main body 72 and re-puncture. Therefore, by preventing re-puncture, problems such as infectious diseases can be avoided and hygienic use can be realized.

  Further, the elastic locking pieces 24 that are in sliding contact with the inner peripheral surface of the protector 14 at the time of puncturing are configured so that only a pair of upper and lower elastic locking pieces 24 are provided, and the frictional resistance due to the sliding contact of the elastic locking pieces 24 is reduced. Efficiency of operation is achieved. In addition, since the pair of elastic locking pieces 24 and 24 are provided symmetrically in the vertical direction, the sliding of the elastic locking piece 24 with respect to the protector 14 prevents the hub 18 and the puncture needle 16 from moving. The pain at the time of puncture can be reduced. In addition, by arranging the pair of elastic locking pieces 24, 24 uniformly on the circumference, the number of formed elastic locking pieces 24 is reduced as much as possible while realizing a balanced sliding contact with the protector 14. The material for forming the hub 18 including the elastic locking pieces 24 can be reduced.

  Moreover, the elastic locking piece 24 extends rearward while tilting outward, and the elastic locking piece 24 comes into sliding contact with the inner peripheral surface of the protector 14 during the puncturing operation, and frictional resistance acts. Even so, the elastic locking piece 24 is not deformed so as to open upward and downward. Therefore, further increase in frictional resistance due to deformation of the elastic locking piece 24 is avoided.

  Accordingly, in the puncture device 70 of the present embodiment, the mechanism for preventing reuse of the used lancet 10 ′ is realized with a structure that minimizes the influence on the puncture operation, and an efficient puncture operation, The improvement of safety by preventing the reuse is achieved at the same time.

  Moreover, the protector 14 is made sufficiently long, and in the lancet 10 before use, the puncture needle 16 and the hub 18 are accommodated in the protector 14 over substantially the entire length. Therefore, the hub 18 and the puncture needle 16 fixed to the hub 18 are protected by the protector 14, and damage to the hub 18 and the puncture needle 16 is avoided.

  Moreover, in the used lancet 10 ′ from which the cap 20 has been removed, the lancet body 12 is accommodated in the inner periphery of the protector 14 over its entire length. Displacement is extremely difficult. Therefore, by any chance, in the used lancet 10 ′, the elastic locking piece 24 is pushed inward to release the locking with the second locking hole 52, and the lancet body 12 is used with respect to the protector 14 before use. Even if the position is forcibly moved, such work is very time-consuming, and the reuse of the used lancet 10 ′ is more effectively prevented.

  The housing 74 of the puncture device 70 is configured by assembling a separate protector holder 78 to the housing main body 76. As a result, the protector holder 78 can be freely set in shape, elasticity, etc. required for switching between holding and releasing the protector 14, and the housing body 76 is exposed to the outside and is free from fingers. The necessary weather resistance, erosion resistance, etc. can be set in consideration of handling in

  Further, the engaging convex portion 88 of the protector holder 78 is supported by the flexible piece 86, and when the protector 14 is inserted, the flexible piece 86 is deformed to the outer peripheral side, and the engaging convex portion 88 escapes to the outer periphery. Thus, the protector 14 is inserted to a predetermined position without being caught by the engaging projection 88. In the present embodiment, the relief recess 94 provided in the housing main body 76 is located on the outer peripheral side of the flexible piece 86, and the deformation of the flexible piece 86 toward the outer peripheral side causes the contact with the housing main body 76. And is allowed by the escape recess 94.

  In addition, since a restricting projection 54 is formed between the first locking hole 50 and the second locking hole 52 in the protector 14 so as to protrude toward the inner peripheral side, the hub 18 can be used as a recovery spring after puncturing. When the vehicle is moved backward by the elastic force of 144, the rear end of the elastic locking piece 24 comes into contact with the regulation protrusion 54. As a result, the engaging portion 26 of the elastic locking piece 24 surely enters the second locking hole 52, and the hub 18 is positioned and held at the reuse prevention position. In addition, since the front surface of the restricting projection 54 is an inclined surface that is gradually inclined forward toward the inner periphery, the engaging portion 26 is formed when the rear end of the elastic locking piece 24 comes into contact with the restricting projection 54. Is positively guided to the second locking hole 52. In the present embodiment, the rear end surface of the elastic locking piece 24 that contacts the front surface of the restricting projection 54 is also an inclined surface corresponding to the front surface of the restricting projection 54, and the guiding action is more effectively exhibited. It is like that.

  Furthermore, at the time of puncturing operation in which the hub 18 moves forward with respect to the protector 14, the elastic locking piece 24 is pushed into the inner peripheral side by the engaging portion 26 getting over the restricting protrusion 54. As a result, the engaging portion 26 of the elastic locking piece 24 does not enter the second locking hole 52 disposed forward and adjacent to the restricting protrusion 54, and extends further forward than the second locking hole 52. Since it is reliably moved, the reliability of the puncture operation can be improved. In addition, since the inner peripheral surface of the restricting protrusion 54 is inclined so that the protruding height toward the inner peripheral side increases as going forward, the engaging portion 26 is caught by the inner peripheral surface of the restricting protrusion 54. Without fail, the stability of the operation is ensured.

  When the lancet 10 is attached to the puncture device main body 72, the protector 14 and the hub 18 of the lancet 10 are positioned in the circumferential direction with respect to the housing 74 of the puncture device main body 72. However, the cap 20 can be easily removed by twisting the cap 20 in the circumferential direction.

  As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited by the specific description. For example, the first and second inclined surfaces do not need to be a single inclined plane, and may be configured by combining a plurality of inclined planes, or may be configured by combining an inclined plane and an axial plane. However, it can also be constituted by an inclined curved surface.

  Further, the contact portion is not limited to the second inclined surface exemplified in the embodiment, and for example, a protrusion that protrudes forward from the bottom inner surface of the fitting recess and contacts the first inclined surface. Can also be employed. In addition, the first inclined surface is set on the bottom inner surface of the fitting concave portion, and a protruding contact portion protruding backward from the protruding tip of the fitting convex portion is provided, and the contacting portion is the first inclined surface. A sliding force may be exerted between the cap and the hub by sliding in the circumferential direction while abutting on the cap.

  Further, the first inclined surface is desirably provided symmetrically on both sides in the circumferential direction with respect to the reference position set on the circumference, but may be provided asymmetrically. Similarly, the contact part (second inclined surface) is desirably provided symmetrically on both sides in the circumferential direction with respect to the reference position, but may be provided asymmetrically.

  In addition, the fragile portion is provided with a local small-diameter thin-wall portion as shown in the above embodiment, and the stress is concentrated by setting the cross-sectional area to be small by forming a through-hole or by changing the material. Even if it acts on, it can be realized.

  In addition, the marking part is not limited to an arrow as long as it is understood that the cap may be rotated to any side in the circumferential direction with respect to the protector when the cap is removed. An explanation by may be provided.

  Further, the specific structure of the rotation restricting means is not particularly limited. For example, a protrusion is formed on the outer peripheral surface of the fitting convex portion, and a concave groove extending in the axial direction is provided on the inner peripheral surface of the fitting concave member. The rotation restricting means can also be configured by inserting the protrusion of the fitting convex portion into the groove of the fitting concave member and locking it in the circumferential direction.

10: Lancet, 14: Protector, 16: Puncture needle (puncture body), 18: Hub, 20: Cap, 28: Fragile part, 30: Blocking part (lid part), 34: Arrow (marking part), 36: Fit Joint convex part, 38: 1st inclined surface, 42: Locking claw (rotation restricting means), 58: Locking hole (rotation restricting means), 60: Fitting concave member (fitting concave part), 62: Second Inclined surface (contact portion), 70: puncture device, 74: housing, 114: puncture spring

Claims (8)

A hub that covers the proximal end portion of the puncture body and a cap that covers the distal end portion of the puncture body are formed, the hub and the puncture body covered with the cap are accommodated in a protector, and the hub is the protector. In the lancet held in
One of the cap and the protector is provided with a first inclined surface, and the other of the cap and the protector is in contact with the first inclined surface and is rotated relative to any direction in the circumferential direction. A contact portion for applying a tensile force between the cap and the hub by movement is provided ; and
The cap is provided with a lid portion that covers the opening of the front end of the protector, and the lid portion is provided with a fitting convex portion that protrudes inward of the protector. One of the first inclined surface and the abutting portion is set on the projecting tip surface, and the protector is provided with a fitting recess that opens toward the tip. The other of the first inclined surface and the corresponding contact portion is set on the bottom surface, and the outer peripheral surface of the fitting convex portion and the inner peripheral surface of the fitting concave portion are fitted and locked to each other. A lancet comprising positioning means for positioning the cap and the protector in a direction perpendicular to the axis .   The first inclined surface is provided symmetrically on both sides in the circumferential direction with respect to a reference position set on the circumference, and the contact portion is provided symmetrically on both sides in the circumferential direction with respect to the reference position. The lancet according to claim 1.   The abutting portion is configured by a second inclined surface corresponding to the first inclined surface, and the first inclined surface and the second inclined surface can be rotated by rotating in any circumferential direction. The lancet according to claim 1 or 2, wherein a tensile force is applied between the cap and the hub by abutting.   The lancet according to claim 3, wherein each of the first inclined surface and the second inclined surface extends on a single inclined plane. Wherein the cap has the cap portion is provided to cover the front end opening of the protector, the lid portion marking unit is provided which indicates that the rotational direction relative to the protector of the cap is on both sides in the circumferential direction The lancet according to any one of claims 1 to 4 . The lancet according to any one of claims 1 to 5 , further comprising rotation limiting means for relatively positioning the cap and the protector in a circumferential direction. The lancet according to any one of claims 1 to 6 , wherein a weakened portion is provided at a boundary portion between the hub and the cap. A puncture device in which a separate lancet is detachably attached to a puncture device body having a housing,
The lancet described in any one of claims 1 to 7 is used, and a spring member for urging the puncture body of the lancet in the puncture direction is disposed in the housing of the puncture device body. A puncture device characterized in that the puncture body protrudes in the puncture direction from the housing by the biasing force of the spring member.

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