The present invention relates to an indwelling needle assembly comprising indwelling needle needle tip protector protects the needle tip of the indwelling needle after use of the indwelling needle to be placed is pierced into a blood vessel, and the needle tip protector.
BACKGROUND
[0002]
　Conventionally, infusion and blood collection, the indwelling needle for use in performing hemodialysis are known. The indwelling needle, while provided with a needle tip at the distal end, the proximal end is fixed to the needle hub. By such indwelling needle is placed is pierced into a blood vessel of a patient, through an external conduit, such as a cannula connected to a needle hub, infusion and blood collection, so that hemodialysis is carried out.
[0003]
　Incidentally, the indwelling needle, preventing erroneous piercing and reuse, or for the purpose of facilitating disposal, there is one provided with a needle tip protector for protecting the needle tip after use. For example, the indwelling needle assembly with needle tip protector and needle tip protector for such indwelling needles, Japanese Patent No. 3134920 proposed by the present applicant (Patent Document 1), and the like.
[0004]
　That is, the needle tip protector described in Patent Document 1 includes a cylindrical peripheral wall, by moving the wall after use of the indwelling needle to the needle tip side, the needle tip of the indwelling needle is protected by the needle tip protector It has become so. Specifically, prior to use of the indwelling needle, the needle tip protector and the needle hub, but the needle tip of the indwelling needle is connected and fixed in a state exposed, connection of the needle tip protector and the needle hub after use by releasing the can tip protector with moving the needle point side to protect the needle tip relative to the needle hub, to hold the state according with the locking portion (flexible abutment branch 43) It has become way. By employing such a needle tip protector and indwelling needle assembly, the needle tip of the indwelling needle is safely protected and may be a risk of erroneous piercing is effectively prevented.
[0005]
　This Then, the applicant consider the further improvement of such needle tip protector and indwelling needle assembly, than the needle tip protector and indwelling needle assembly described in Patent Document 1, which is excellent in safety, etc. invention than it was able to develop.
CITATION
Patent Document
[0006]
Patent Document 1: Japanese Patent No. 3134920
Summary of the Invention
Problems that the Invention is to Solve
[0007]
　The present invention was made against the background of the circumstances described above, the problem to be solved may be than conventional enhanced safety, and the like, needle tip protector and indwelling needle indwelling needle having a novel structure It is to provide an assembly.
Means for Solving the Problems
[0008]
　Following, the aspects of the present invention has been made in order to solve such problems. Incidentally, elements employed in each embodiment described below may be adopted at any possible optional combinations.
[0009]
　A first aspect of the present invention includes a cylindrical peripheral wall, there in needle tip protector covers the needle tip of the indwelling needle by moving the outer 挿装 wear needle hub of the indwelling needle to the needle tip side Te, wherein the moving position of the needle tip side of the indwelling needle locked in the needle hub, the locking portion for preventing re-exposure of the needle tip by preventing retraction of the proximal side of the indwelling needle but with formed inside covered with the tubular wall, the locking portion is characterized in that it is integrally formed with said cylindrical peripheral wall.
[0010]
　According to the structure as has been indwelling needle needle tip protector according to the present embodiment, since the locking portion for preventing re-exposure of the needle tip is integrally formed on the inside of the peripheral wall, external to the locking portion It can be difficult to access from. As a result, the locking portion is broken by some external force or contact with the locking portion unintentionally, things like protection state of the needle tip is released and it becomes possible to prevent.
[0011]
　A second aspect of the present invention, in the indwelling needle needle tip protector according to the first aspect, which the locking portion is extending toward the base end side of the peripheral wall in the cylindrical inside wall it is.
[0012]
　According to the structure as has been indwelling needle needle tip protector according to the present embodiment, since the engagement portion extends toward the base end side of the peripheral wall, moves the indwelling needle proximally relative to needle tip protector when, for example, as compared with the case where the locking portion extends distally, caught, a possibility that the user feels sense of resistance can be reduced.
[0013]
　A third aspect of the present invention is the first or the needle tip protector for an indwelling needle according to a second aspect, the whole of the locking portion, is an accommodation state inside covered with the tubular wall and those are.
[0014]
　According to the structure as has been indwelling needle needle tip protector according to the present embodiment, since the whole of the locking portion is accommodated in the interior of the peripheral wall, external access to the locking portion are more difficult , the needle tip is exposed unintentionally is further effectively prevented, can achieved the further improvement of safety.
[0015]
　A fourth aspect of the present invention, the needle tip protector for an indwelling needle according to the first to third one aspect, expanded portion extending to the outer periphery is provided at the base end side of the cylindrical peripheral wall cage, in which the locking portion is provided in the the enlarged opening portion.
[0016]
　According to the structure as has been indwelling needle needle tip protector according to the present embodiment, since the engaging portion is provided in the expanded portion provided on the base end side of the peripheral wall, the size of the locking portion while sufficiently secured, it is also avoided that the diameter of the needle hub to be inserted into the peripheral wall becomes too small.
[0017]
　A fifth aspect of the present invention, in the indwelling needle needle tip protector according to a fourth aspect, the front end portion of the expanding portion, the outer peripheral side toward the front in the inner peripheral surface of the cylindrical peripheral wall stepped surface is provided extending, in which the locking portion toward the rear is formed to protrude at the rear end portion of the enlarged opening portion than stepped shape surface.
[0018]
　According to the structure as has been indwelling needle needle tip protector according to the present embodiment, the inner peripheral surface of the peripheral wall, since the stepped surface extending to the outer peripheral side toward the front is provided, for example, on the outer peripheral surface of the needle hub by providing a locking protrusion protruding on the outer circumferential side, when moving the indwelling needle proximally relative to needle tip protector, engages and the locking projection and the stepped surface, more proximal movement of the indwelling needle can be limited. Thus, by utilizing the locking portion, it is possible to indwelling needle is prevented from falling out from the base end side of the needle tip protector.
[0019]
　A sixth aspect of the present invention, in the fourth or the needle tip protector for an indwelling needle according to a fifth aspect, the expanding portion is substantially elliptic cylinder shape with a small diameter portion and a large diameter portion which are perpendicular to each other and are, together with the locking portion inside covered with the peripheral wall of the large diameter portion is provided, the needle tip of the indwelling needle the needle hub in the circumferential wall of the large diameter portion is engaged is in which the needle hub engaging portion held in the projecting state is provided.
[0020]
　According to the structure as has been indwelling needle needle tip protector according to the present embodiment, since the expanded portion has a substantially elliptic cylindrical shape having no corner, the patient expanding portion is in contact with the patient the pain I fear you feel can be reduced. In particular, since the expanding portion is provided with a small-diameter portion, and can reduce the amount of contact to the patient, possibly patient feels pain can be further reduced.
[0021]
　Furthermore, rather than simply providing the large diameter portion of the wall thickness, by providing the interior locking portion of the large diameter portion, with the interior space of the expansion portion can be skillfully utilized, air into the member and it is possible to prevent contamination of effectively, the quality of products such as the dimensional error can be reduced can be enhanced.
[0022]
　A seventh aspect of the present invention, the needle tip protector for an indwelling needle according to any of embodiments of the first to sixth, wherein the locking portion more spaced apart from each other in the circumferential direction of the tubular peripheral wall it is those that are provided.
[0023]
　According to the structure as has been indwelling needle needle tip protector according to the present embodiment, since the plurality of engaging portions are provided spaced apart from each other in the circumferential direction, more reliably retreat to the base end side of the indwelling needle is blocked, re-exposure prevention effect of the needle tip can be exerted more stable.
[0024]
　An eighth aspect of the present invention, the needle tip protector for an indwelling needle according to any of embodiments of the first to seventh, the cylindrical free end extending from the peripheral wall of the said locking unit, to said needle hub engaging optionally with being the first locking portion for preventing movement needlepoint re-exposure due to the needle tip side of the indwelling needle in the cylindrical inside wall of the tubular of the locking portion fixed end which is integrally supported by the peripheral wall, and a second locking portion for preventing the withdrawal needle by movement of the base end side of the indwelling needle in the cylindrical inside wall by engagement of the needle hub those which are.
[0025]
　According to the structure as has been indwelling needle needle tip protector according to the present embodiment, since the movement in both directions to the distal side and the proximal side with respect to the needle tip protector of the indwelling needle by the locking portion formed in the peripheral wall is prevented the needle tip re-exposure prevention mechanism and needle extraction preventing mechanism as compared with a case of providing separately can be made simple structure.
[0026]
　A ninth aspect of the present invention, the needle tip protector for an indwelling needle according to any of embodiments of the first to eighth, deformation amount limiting unit which limits the amount of deformation of the outer peripheral side of the locking portion is provided it is what is.
[0027]
　According to the structure as has been indwelling needle needle tip protector according to the present embodiment, in the state where the locking portion to move the needle tip side of the indwelling needle is held on the needle hub, needle tip protector and / or for indwelling needle the needle hub, for example, when an external force such as the bending direction is exerted also, since the deformation of the outer peripheral side of the engaging portion is restricted by the deformation amount limiting portion, the locking portion, the locking relative to the needle hub is reduced risk of being released, the needle tip of the protection state of the indwelling needle can be maintained stably.
[0028]
　A tenth aspect of the present invention, the relative one of the indwelling needle needle tip protector in accordance with aspects of the 1-9, movably inserted indwelling needle having a needle hub on the proximal end side in the axial direction It is, at a predetermined position where the needle destination protector was moved to the needle tip side of the indwelling needle, that the locking portion provided in the needle destination protector is locked against needle hub it is indwelling needle assembly re-exposure of the needle tip of the indwelling needle is adapted to be prevented.
[0029]
　According to this embodiment, the indwelling needle assembly re-exposure of the needle tip of the indwelling needle is exhibited such effects of the according to any of embodiments of the first to ninth is prevented can be provided.
[0030]
　An eleventh aspect of the present invention, the tenth a indwelling needle assembly according to the embodiment of the locking free end extending toward the proximal side from said cylindrical wall at the end side, to said needle hub engaging optionally with being the first locking portion for preventing movement needlepoint re-exposure due to the needle tip side of the indwelling needle in the cylindrical inside wall of the tubular of the locking portion fixed end which is integrally supported by the peripheral wall, and a second locking portion for preventing the withdrawal needle by movement of the base end side of the indwelling needle in the cylindrical inside wall by engagement of the needle hub while being, the needle hub and the engagement recess is provided, it is configured a third locking unit to which an engaging portion said is engaged by the base end side of the inner surface of the engaging recess it is those who are.
[0031]
　According to the structure as it has been indwelling needle assembly according to the present embodiment, since the first locking portion and the second locking portion of the locking portion of the needle tip protector is locked relative to the needle hub, of the indwelling needle since the movement in both directions to the distal side and the proximal side with respect to the needle tip protector is prevented, the needle tip re-exposure prevention mechanism and needle extraction preventing mechanism as compared with a case of providing separately simplest or compact structure it can be such things.
[0032]
　A twelfth aspect of the present invention is a indwelling needle assembly in accordance with aspects of the first 10 or 11, the free end side of the first engagement that extends proximally from the tubular wall at the locking portion are a stop portion, said that said first locking portion relative to the third engagement portion provided on the outer peripheral surface of the needle hub is locked, the indwelling needle in the cylindrical inside wall while moving needle tip re-exposure due to the needle tip side is to be prevented, the proximal end face of the first locking portion intersect at right angles to the needle axis direction of the indwelling needle together has a first axial face, the three locking portions said is one having a third axis face intersecting at a right angle to the needle axis direction of the indwelling needle.
[0033]
　According to the structure as has been indwelling needle assembly according to the present embodiment, the first axis facing the third abutment surface of the cross of the first locking portion and the third engaging portion extends perpendicular to the abutment direction by being the axis faced without employing the molding is difficult tends undercut shape, the engaging portion can be realized to exhibit a greater shift preventing force.
[0034]
　A thirteenth aspect of the present invention, the twelfth an indwelling needle assembly in accordance with aspects of the end portion of the outer peripheral side of the first locking portion and the needle tip protector of the first axis facing of the in which are located on the inner circumferential side than the end on the outer side of the third shaft face of the needle hub provided on the needle hub.
[0035]
　According to the structure as has been indwelling needle assembly according to the present embodiment, even if the first axis facing in the first locking portion in contact with the first locking portion and the third engaging portion is slightly deformed is inclined , since the end portion of the outer peripheral side of said uniaxial face is positioned in the third axial face, the first locking portion is generated in the direction of the component force rides the third engaging portion is suppressed, a more stable the locked state can be realized.
The invention's effect
[0036]
　According to the structure as has been indwelling needle needle tip protector according to the present invention, since the locking portion for preventing re-exposure of the needle tip is integrally formed on the inside of the peripheral wall, unintended to the locking portion etc. is avoided contact, improvement in safety can be achieved.
BRIEF DESCRIPTION OF THE DRAWINGS
[0037]
[1] a plan view showing an indwelling needle assembly in the protruding state of the tip with the indwelling needle needle tip protector of the first embodiment of the present invention.
[2] a front view of the indwelling needle assembly shown in FIG.
[Figure 3] III-III cross-sectional view in FIG.
[Figure 4] a cross-sectional view showing an enlarged main portion of FIG.
[5] a perspective view showing an enlarged indwelling needle needle tip protector constituting the indwelling needle assembly shown in FIG.
[6] a right side view of the indwelling needle needle tip protector shown in FIG.
[7] The indwelling needle assembly shown in FIG. 7 a longitudinal sectional view showing in a protected state of the needle point, corresponding to FIG. 3.
[8] a cross-sectional view showing an enlarged main portion of FIG.
[9] a cross-sectional view showing a further enlarged main portion in FIG. 7.
[10] a right side view of the indwelling needle needle tip protector of the second embodiment of the present invention, corresponding to FIG. 6.
[Figure 11] XI-XI cross section in FIG. 10.
[12] The main part of the indwelling needle assembly comprising an indwelling needle for needle tip protector shown in FIG. 10 a longitudinal sectional view showing in a protected state of the needle tip, corresponding to FIG. 8.
[13] a sectional view showing an enlarged main portion of FIG. 12, corresponding to FIG. 9.
DESCRIPTION OF THE INVENTION
[0038]
　Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0039]
　First, FIG. 1-4, and the indwelling needle assembly 12 comprising a needle tip protector 10 for the indwelling needle of the first embodiment of the present invention is shown. The indwelling needle assembly 12 includes a indwelling needle 16 having a needle tip 14 is provided with a needle tip protector 10 in which the indwelling needle 16 is movably inserted in the needle axial direction, the indwelling needle 16 to the patient's blood vessel by puncturing to indwelling, via an external line 18, such as a cannula that is connected to the proximal end side of the indwelling needle assembly 12, infusion and blood collection, so that the like hemodialysis is performed. Then, after use of the indwelling needle 16, the indwelling needle 16 while removed from the patient's blood vessel, by moving the needle tip protector 10 to the needle point 14 side, the needle tip 14 of the indwelling needle 16 by needle tip protector 10 It is adapted to be protected covered with. In the following description, the front end side or the front, whereas say left in FIG. 1 is a needlepoint 14 of the indwelling needle 16, the base end side or rear, the puncture direction behind the indwelling needle 16 made refers to the right side in FIG. 1.
[0040]
　More specifically, the indwelling needle assembly 12, needle tip protector 10 is constructed by being outside 挿装 wearing against constituted needle unit 20 includes an indwelling needle 16. Further, the needle unit 20 includes a indwelling needle 16 and a needle hub 22 for fixing and supporting the base end side of the indwelling needle 16.
[0041]
　Indwelling needle 16, for example, be a metal hollow needle, and is formed by a stainless steel. Needlepoint 14 of the indwelling needle 16 is tapering is the sharp shape. Note that the needle tip 14 of the indwelling needle 16 has a through hole 24 is formed, the blood is more likely to flow into the indwelling needle 16.
[0042]
　On the other hand, the needle hub 22, the needle hub body 26 of generally cylindrical shape, respectively, a support portion 28 for fixing and supporting the needle hub body 26, (the left-right direction in FIG. 1) the needle axial direction of the indwelling needle 16 in is the interconnected structures.
[0043]
　The needle hub body 26 is formed by the overall and inner diameter is substantially constant cylindrical shape as, for example, a hard synthetic resin. Incidentally, the inner diameter of the distal end opening of the needle hub body 26, while being substantially equal to the outer diameter of the indwelling needle 16, the inner peripheral surface at the tip portion of the needle hub body 26 is protruded on an inner peripheral side an annular positioning protrusion 30 is provided. Is inserted base end of the indwelling needle 16 from the distal end opening of such needle hub body 26, by the proximal end of the indwelling needle 16 and the positioning protrusion 30 abut against each other, the proximal end of the indwelling needle 16 is positioned It is adapted to be. Further, if necessary, by a needle hub body 26 and the indwelling needle 16 is bonded, tip indwelling needle 16 of the needle hub body 26 is adapted to be fixedly supported.
[0044]
　On the other hand, the outer diameter of the needle hub body 26 is different from a needle axis. That is, the axially intermediate portion of the needle hub body 26, small-diameter cylindrical portion 32 having an outer diameter is smaller is provided than the proximal portion. Then, the outer peripheral surface of the needle hub body 26 at the distal end side than the small diameter cylinder portion 32 has an outer diameter is tapered surfaces 34 gradually increases toward the distal end side.
[0045]
　Further, the outer peripheral surface of the needle hub body 26 at the distal end side of the tapered surface 34, an annular engagement recess 36 which opens to the outer peripheral side is formed. Such engagement recess 36, as well as has a predetermined width (needle axial dimension), the minimum outer diameter of the needle hub body 26 in the area where the locking recess 36, the outer diameter of the small diameter cylinder portion 32 It is substantially equal to the dimension. Furthermore, the outer peripheral surface of the distal end side than the locking recess 36, an annular locking portion 38 projecting to the outer peripheral side is formed. The outer diameter dimension of the locking projections 38 is larger than the maximum outer diameter at the tip portion of the tapered surface 34.
[0046]
　The base end side constituting the inner surface of the engaging recess 36 is formed into a predetermined dimension A cyclic proximal regulating surface 40 as a third engaging portion extending in the axis-perpendicular direction with a (see FIG. 9) are continuous stepwise by bottom surface and the tapered surface 34 transgressions proximal regulating surface 40 of the locking recess 36. On the other hand, the tip side constituting the inner surface of the engaging recess 36 is an annular front end side regulating surface 42 of the fourth locking portion extending in the axis-perpendicular direction with a predetermined size B (see FIG. 9), engagement is continuous with the stepped by the outer peripheral surface and the front end side regulating surface 42 of the bottom surface and the locking projections 38 of the locking recess 36. In the present embodiment, the dimension A of the axis-perpendicular direction of radicals end regulating surface 40 formed by the base end side inner surface of the engagement recess 36, as compared with the axis-perpendicular direction of the dimension B of the distal end regulating surface 42 It is slightly larger.
[0047]
　Further, the support portion 28, as a whole, which is substantially cylindrical step is formed on the inner peripheral surface, as for example the needle hub body 26 is formed of a hard synthetic resin. That is, while the front end side is a small connection tubular part 44 of the inner diameter, the proximal end side is a large cylindrical connecting portion 46 of the inner diameter. Then, the proximal end of the needle hub body 26 is inserted into the connecting tube portion 44, by bonding or welding is performed as necessary, and the needle hub body 26 and the support portion 28 are connected to each other. On the other hand, the connecting tube portion 46 is inserted the tip of the outer conduit 18, by bonding or welding is performed as necessary, the support portion 28 and the outer pipe 18 are connected to each other. Thus, the inner hole of the indwelling needle 16 and needle hub 22 (the needle hub body 26 and the support portion 28), the fluid flow path 48 extending from the vessel to the external conduit 18 is configured.
[0048]
　Incidentally, the outer circumferential edge portion of the connecting tube portion 46, in the radial direction in one direction on both sides (upper and lower opposite sides in FIG. 1), a pair of engaging arms 50, 50 projecting distally with a predetermined width is integrally It is formed. Such engagement arms 50, 50 (vertical dimension in Figure 1) plate thickness dimension in the (connection portion between the connection tube portion 46) are substantially rectangular, the proximal end portion in plan view and the width ( with vertical dimension in FIG. 2) is a thin, the radial direction between the coupling tube unit 44 has slit-like gap 52 is formed, the engaging arm 50, 50 thickness direction in and is elastically deformable. Further, the tip portions of the engagement arms 50 and 50, hooks 56, 56 projecting to the outer peripheral side is formed.
[0049]
　On the other hand, needle tip protector 10, as shown in FIGS. 5 and 6 are substantially cylindrical shape extending in the needle axial direction as a whole, for example, polypropylene or polycarbonate, hard like glycol modified polyethylene terephthalate and ABS resin It is integrally formed of a synthetic resin. That is, according needlepoint protector 10 is provided with a bore 60 extending through the interior of the cylindrical wall 58 and the peripheral wall 58 in the needle axial direction.
[0050]
　The needle tip protector 10 (wall 58) is different from the shape in the needle axial direction, the leading end side, with there is a cylindrical portion 62 whose cross section is substantially a true circular shape, the base end side, the cylinder there is a enlarged diameter portion 64 of the expanding portion extending to the outer periphery large diameter than Jo unit 62. That is, the peripheral wall 58 of the needle tip protector 10 is configured to include a peripheral wall of the peripheral wall and the enlarged diameter portion 64 of the cylindrical portion 62, the inner peripheral surface 65 of the peripheral wall 58, of the peripheral wall of the cylindrical portion 62 It is configured to include a circumferential surface and the inner peripheral surface of the peripheral wall of the enlarged diameter portion 64.
[0051]
　Enlarged diameter portion 64, as also shown in FIG. 6, which is a substantially elliptic cylindrical shape, as compared to the width of the outer peripheral surface in the horizontal direction has a smaller diameter direction in FIG. 6, a large diameter in FIG. 6 towards the width of the outer peripheral surface in the vertical direction is a direction is larger. That is, of the wall portion constituting the enlarged diameter portion 64, while the portion constituting the walls of the left and right direction in FIG. 6 is a small-diameter portion 66, constituting the wall of the vertical direction in FIG. 6 portions are large-diameter portion 68, and the opposite direction of the opposing direction and large-diameter portion 68 of the small diameter portion 66 are orthogonal to each other.
[0052]
　Incidentally, the outer peripheral surface of the large-diameter portion 68 has an outer diameter is gradually increased toward the proximal side from the distal end side, to the outer surface from the outer peripheral surface of the large diameter portion 68 of the cylindrical portion 62 It is connected by a smooth curved surface. Further, the thickness dimension of the cylindrical portion 62 toward the large-diameter portion 68 together with is substantially constant in the needle shaft direction, is smaller than the thickness dimension of the small diameter portion 66, 66. Thus, inside the enlarged diameter portion 64, cross section, is substantially oval shape which towards the vertical dimension is larger in FIG. 6 from the transverse dimension in FIG. 6, and, on the proximal side the internal space 70 of headed vertical dimension in FIG. 6 gradually increases is formed on the base end side of the inner hole 60 penetrating the needle tip protector 10.
[0053]
　Further, each of the large diameter portion 68, 68, through window 72, 72 as the needle hub engaging portion extending at a predetermined peripheral dimension with penetrating in the thickness direction is formed. Circumferential dimension of such through window 72, 72 is larger than the circumferential dimension of the hook 56.
[0054]
　In such an internal space 70, from the inner circumferential surface 65 of the peripheral wall 58, engaging pieces 74, 74 as a pair of engaging portions projecting therein are integrally formed. These locking pieces 74 and 74, in the interior of the large-diameter portion 68, 68 in the enlarged diameter portion 64, the position corresponding to the large diameter portion 68, i.e. opposite in the vertical direction in FIG. 6 (circumferential direction in mutually spaced apart) are provided.
[0055]
　That is, the front end portion of the enlarged diameter portion 64, the inner peripheral surface 65 of the peripheral wall 58, an annular stepped surface 76 extending in the axis-perpendicular direction with a predetermined dimension C (see FIG. 9) is formed, the step the distal end side has a larger diameter than the proximal end side than Jo surface 76. In short, such stepped surface 76, and extends to the outer peripheral side toward the front. The size C of the axis-perpendicular direction in the stepped surface 76 is smaller than the axis-perpendicular dimension B at the tip end regulating surface 42 of the locking recess 36. Then, the base end side than the stepped surface 76, engaging pieces 74, 74 are projectingly formed from the stepped surface 76 toward the base end side of the peripheral wall 58. Incidentally, such a locking piece 74, along with extending toward the base end side parallel to the needle axis direction substantially from the stepped surface 76 is curved in each circumferential direction, the projecting tip (needle axis the proximal end) locking claws 78, 78 to bend to the inner circumferential side is formed.
[0056]
　Inner circumferential surfaces of the locking claws 78, 78 are curved in the respective circumferential direction, the radius of curvature of the inner peripheral surface of the locking claw 78, the outer diameter of the small diameter cylinder portion 32 in the needle hub body 26 It is substantially equal to the radius. Further, between opposed surfaces distance in the radial direction of the inner peripheral surface of the locking claw 78, while being substantially equal to the outer diameter of the small diameter cylinder portion 32, the maximum outer diameter of the tip portion in the tapered surface 34 It is smaller than the dimension. However, the opposing surface between the distance in the radial direction of the inner peripheral surface of the locking claw 78 may be is slightly smaller than the outer diameter of the small diameter cylinder portion 32, be slightly larger good.
[0057]
　Further, the proximal end face of the locking claws 78, 78 (protruding end face) 79, 79 is a vertical surface 79a which is the inner circumferential side extends in the axis-perpendicular direction with a predetermined dimension D (see FIG. 9), there is a 79a together, the outer peripheral side, inclined surface 79b which is inclined distally as they become the outer peripheral side, there is a 79b. In the present embodiment, the vertical surface 79a, the axis-perpendicular direction of the dimension D in 79a, and substantially the same or slightly larger and the direction perpendicular to the axis of the dimension A at the base end regulating surface 40 of the locking recess 36. Thus, as will be described later, the engaging claw 78 is in contact with the base end regulating surface 40 moving to the tip side of the needle unit 20 (movement in the needle axial direction base end side of the needle tip protector 10) There when it is restricted, the entire surface of the vertical surface 79a of the base end regulating surface 40, will be in contact with the 79a, a sufficiently large contact area can be ensured. Furthermore, a vertical surface 79a, the inclined surfaces 79b located on the outer peripheral side of 79a, 79b is, since it is inclined to the distal end side as made on the outer peripheral side vertical face 79a, and the 79a and proximal end side regulating surface 40 the inclined surface 79b, to be able to abut without interference from 79b, the relative movement prevention effect in the axial direction of the needle unit 20 and the needlepoint protector 10 can be more reliably achieved.
[0058]
　Further, the projecting tip (locking claw 78, 78) of the locking piece 74 is located on the distal end side than the base end of the enlarged diameter portion 64. That is, the whole of the locking piece 74 is, in the internal space 70 of the enlarged diameter portion 64, are provided in a housing state.
[0059]
　In the present embodiment, the tip portion of the needle tip protector 10, the wings 80 are provided. That is, the tip portion of the cylindrical portion 62, with which a small-diameter cylindrical portion 82 which is smaller in diameter than the other portion, the outer peripheral surface of the smaller cylindrical portion 82 of the plurality of projecting to the outer peripheral side collision Article 84 is formed. Then, the small-diameter cylindrical portion 82, the fitting cylinder 90 with a pair of vane body 88 via the coupling portion 86 and 86 while being fitted, the stopper 92 to ridges 84 are fitted Accordingly, wings 80 are attached to the tip portion of the needle tip protector 10. Incidentally, such wings 80 are formed by, for example, a soft synthetic resin.
[0060]
　By being inserted needle unit 20 from the base end side opening of the inner hole 60 of the needle tip protector 10 having the above-described structure, the indwelling needle assembly 12 is constructed. Here, in a state before use of the indwelling needle assembly 12 shown in FIG. 1 and the like, and needle tip 14 of the indwelling needle 16 is positioned on the distal end side than the needle tip protector 10, the needle tip 14 is exposed there. In this state, the through window 72, 72 provided on the enlarged diameter portion 64 of the needle tip protector 10, is locked enters the hook 56 of the engaging arms 50, 50 provided on the needle hub 22 , needlepoint protector 10 and the needle hub 22 (the needle unit 20) is in a coupling state, so that the protruding state of the tip 14 is maintained.
[0061]
　And, in such an initial state, it is in contact with the outer peripheral surface of the small diameter cylinder portion 32 of the locking claw 78 of the needle tip protector 10 is the needle hub body 26. Incidentally, these locking claws 78, 78 may be have been pressed slightly outer circumferential side abuts against the outer peripheral surface of the small diameter cylinder portion 32, slightly away from the outer peripheral surface of the small diameter cylinder portion 32 it may be.
[0062]
　Indwelling needle assembly 12 which is the above structure, by the indwelling needle 16 indwelled in puncture the blood vessel of the patient, transfusion and blood sampling through the fluid flow path 48, it is subjected to hemodialysis. Incidentally, since the indwelling needle assembly 12, the wings 80 of the present embodiment is provided, for example, while viewing pinches the airfoil 80, it is possible to puncture the indwelling needle 16. Further, when the indwelling an indwelling needle 16 in the puncture state, by tape fixed at the position of the wing portion 80 can be fixed with a large contact area to the skin.
[0063]
　When removed such indwelling needle 16, the state where the needle tip protector 10 and the tape fixing the wings 80 pushes the engaging arms 50 and 50 in the needle hub 22 to the inside with the fingers. Thus, it is released engagement between the hook 56 and the through window 72, the needle unit 20 relative to needle tip protector 10 can be moved proximally. Further, the indwelling needle 16 with a needle unit 20 relative to needle tip protector 10 is moved proximally by removal from the skin, needlepoint protector 10 is moved in the needle tip 14 of the needle unit 20.
[0064]
　In this case, even if the locking of the needle hub 22 is pressed by an external force of some sort engaging arms 50, 50 inward and (needle unit 20) and the needle tip protector 10 is released unintentionally, the locking claw 78, the outer peripheral surface of the small diameter cylinder portion 32 from the front end side 78 abuts, since the frontward into being tapered surface 34 of the outer diameter is increased gradually, the needle unit 20 relative to needle tip protector 10 if applying an external force to move proximally, the needle unit 20 is made so as not to move. Thus, malfunction of the needle tip 14 of the indwelling needle 16 inadvertently become protected by the needlepoint protector 10 can be prevented.
[0065]
　Here, by moving proximally relative to needle tip protector 10 of the needle unit 20, while being pressed to the outer peripheral side locking piece 74 and 74 by the tapered surface 34 of the needle hub body 26 locking claws 78 , 78 are slid against the tapered surface 34. Thus, the elastic restoring force of the inner peripheral side is exerted as an urging force to the locking piece 74, 74. Therefore, the pressing force of the tapered surface 34 of the locking claws 78, 78 is a resistor, the user, while confirming the feeling that withdrawal of the needle unit 20 relative to needle tip protector 10, the needle unit it can be moved 20.
[0066]
　Then, as shown in FIGS. 7-9, by retracting movement of the needle unit 20 relative to needle tip protector 10 (the needle tip 14 of the needle unit 20 is moved forward the needle tip protector 10), the indwelling needle 16 with the needle tip 14 is covered by the needlepoint protector 10, the locking claw 78 of the locking piece 74 is elastically restored rides over the tapered surface 34 of the needle hub body 26, the engagement recess 36 It is adapted to penetrate within. In such state, in particular vertical surfaces 79a, 79a and the base end regulating surface 40 of the locking recess 36 comes into contact (engagement claw 78 is engaged with the base end regulating surface 40 of the locking claws 78, 78 moving to the tip side of the needle unit 20 (movement in the needle axial direction base end side of the needle tip protector 10) is adapted to be limited by to) be. Thus, re-exposure of the needle tip 14 of the indwelling needle 16 is adapted to be prevented.
[0067]
　At the same time, the tip end regulating surface 42 of the stepped surface 76 and the locking recess 36 provided in the front end portion of the locking piece 74 abuts (stepped surface 76 is locked to the distal end side regulating surface 42 that) so that the proximal movement of the needle unit 20 is restricted by. Accordingly, the indwelling needle 16, withdrawal of the proximal end side of the needle tip protector 10 is adapted to be prevented. Thus, movement in the axial direction on both sides of the needle unit 20 is blocked against the needlepoint protector 10, the protection state of the needle tip 14 of the indwelling needle 16 is adapted to be maintained by the needle tip protector 10.
[0068]
　That is, in this embodiment, the locking claws 78, 78 provided on the free end of the locking piece 74 is, is the first locking portion for preventing re-exposure of the needle tip 14 of the indwelling needle 16 there. On the other hand, stepped surface 76 for integrally supporting the fixed end side of the locking piece 74 is, the needle unit 20 is a second locking portion for preventing the withdrawal from the base end side of the needle tip protector 10 ing. Then, the proximal end face 79 of the first locking portion (locking claw 78), while having a vertical surface 79a, 79a of the first shaft facing extending in the axis-perpendicular direction, the second locking portion (stepped surface 76) is, there is a second shaft face extending in the axis-perpendicular direction. Further, the inner surface of the engagement recess 36, the base end side (proximal end side regulating surface 40) is the third engaging portion, with which is a third axis face extending perpendicular to the axis, the tip side (tip side regulating surface 42) is the fourth engaging portion, there is a fourth axis face extending in the axis-perpendicular direction.
[0069]
　In particular, coupled with the present embodiment, since the pair of locking portions (the engaging pieces 74, 74) is provided, and it takes the locking portion is integrally formed with the peripheral wall 58 of the needle tip protector 10 also I, when allowed locking by the first locking portion to move the needle tip protector 10 such as the above on the distal end side of the indwelling needle 16, a defect such as a needle tip protector 10 from rattling relative to the needle unit 20 It can be effectively prevented. Thus, two engaging portions (engaging pieces), or three or more provided that, is retracted more reliably prevented to the base end side of the indwelling needle 16 in needle tip protector 10, the needle tip re-exposure prevention effect can be exhibited with more stable. In this case, the plurality of engaging portions are preferably provided substantially symmetrically with respect to the center axis of needle tip protector 10.
[0070]
　In a state where the needle tip 14 of the indwelling needle 16 is protected by the needlepoint protector 10, to release the tape fixing the wings 80, removing the indwelling needle assembly 12 from the patient. According to the procedure of such removal, since the needle tip 14 to disposal from the puncture of the indwelling needle 16 is not exposed at all, such erroneous piercing can be more reliably prevented. However, procedures for the protection of the needle tip 14 is not limited to the above steps, the indwelling needle 16 to release the tape fixing the wings 80 after removal from the vessel, the needle unit 20 in needle tip protector 10 retracting movement against, may be to protect the needle tip 14 of the indwelling needle 16.
[0071]
　Incidentally, when the locking claw 78, 78 has entered the locking recess 36, in the tip of the locking claw 78, 78 abuts against the bottom surface of the engagement recess 36, the user that the contact shock or sound There are can be confirmed, for example, a risk of a pull-out operation of the needle unit 20 will be interrupted is avoided. Thus, protection of the needle tip 14 of the indwelling needle 16 according needlepoint protector 10 can be more reliably achieved.
[0072]
　In needlepoint protector 10 and the indwelling needle assembly 12 is the above such construction, the engaging pieces 74, 74 to prevent re-exposure of the needle tip 14 of the indwelling needle 16, into the cylindrical peripheral wall 58, in particular since the entirety of which is provided to be accommodated, it is substantially impossible to contact externally unintentionally locking pieces 74, 74. Therefore, in the protection state of the needle tip 14 of the indwelling needle 16 according needlepoint protector 10, the needle tip 14 of the indwelling needle 16 to release the engagement between the engaging piece 74 and the engagement recess 36 unintentionally be re exposed from needlepoint protector 10 can be effectively prevented.
[0073]
　In particular, the locking pieces 74, 74 are provided on the enlarged diameter portion 64 which is flared at the proximal side of the needle tip protector 10. Accordingly, while securing a sufficient size of the engaging piece 74, needle hub 22 (the needle hub body 26) which is inserted between the engaging piece 74, 74 is also employed outside diameter is sufficiently large It may be. Furthermore, in this embodiment, the enlarged diameter portion 64 is a substantially elliptical shape, since the outer peripheral surface thereof is smoothly continuous from the outer peripheral surface of the cylindrical portion 62, and the patient enlarged diameter portion 64 contact with, a risk that the patient feels the pain has been reduced.
[0074]
　Furthermore, the locking piece 74 and 74, since it is provided inside of the large diameter portion 68, 68 constituting the enlarged diameter portion 64 of such a substantially elliptical shape, the inner space of the large-diameter portion 68, 68 Takumi it is possible to Ku use, the large-diameter portion 68 is also prevented that a thick, decreasing the occurrence and quality accuracy of dimensional errors due to mixing of air bubbles into the molding during member is suppressed. Further, the locking portion (locking pieces 74) is preferably provided so as to extend in the same direction as the large diameter portion 68, 68 (the axial direction of the base end side). With this configuration, it may not greatly provided unnecessarily enlarged diameter portion 64, with the inner space of the large-diameter portion 68, 68 can be skillfully utilized, the large-diameter portion 68 There is also avoided that a thick, decreasing the occurrence and quality accuracy of dimensional errors due to mixing of air bubbles into the molding during member is suppressed.
[0075]
　Also, de-locking pieces 74, 74 that provided so as to protrude into the interior of the peripheral wall 58, for example, the needle tip protector 10 when manufactured by molding, the mold with the needle axis of the needle tip protector 10 and it is possible to mold, it is possible to suppress the number of types of molds is also reduced. Therefore, improvement in the production efficiency of needle tip protector 10 can be reduced.
[0076]
　In particular, the locking pieces 74 and 74, since it extends toward the proximal side, without or caught upon withdrawal of the needle unit 20 with respect to the needle tip protector 10, smooth withdrawal can be achieved.
[0077]
　Further, the engaging piece 74, 74, since it is provided a pair opposed to each other in the radial direction, the protection state of the needle tip 14 of the indwelling needle 16 according needlepoint protector 10, i.e., the engaging piece 74 and the locking in the engagement state between the recess 36 can be sandwiched between radial needle hub body 26 by engagement pieces 74, 74. Maintaining Therefore, needlepoint protector 10 and the needle unit 20 (the needle hub body 26) without or wobble between Toga径 direction, the protection state of the needle tip 14 of the indwelling needle 16 according needlepoint protector 10 is stably It may be.
[0078]
　Further, in the protection state of the tip 14, by the engagement claw 78 which is a first locking portion and the base end regulating surface 40 of the engaging recess 36 a third locking part is brought into contact with each other needlepoint protector 10 with respect to the needle unit 20 can be prevented from moving proximally. On the other hand, by a stepped surface 76 is a second locking portion and the distal end side regulating surface 42 of the engaging recess 36 a fourth locking portion abut against each other, the needle tip protector 10 against the needle unit 20 There may be prevented from moving distally. Here, these first to fourth engaging portion, since it has a first to fourth shaft face extending in the axial direction perpendicular with a molded easy no undercut shape, contact force and contact reaction force may be tightening efficiently Namaze as axial forces. Further, each of the contact area be able to sufficiently secure the movement of the distal end side and proximal side of the needle tip protector 10 against the needle unit 20 can be more reliably prevented.
[0079]
　Next, 10 and 11 are needle tip protector 100 for the indwelling needle of the second embodiment of the present invention is shown. Structure of needle tip protector 100 of the present embodiment, the first embodiment and have been substantially the same, in the present embodiment, in the internal space 70 of the enlarged diameter portion 64 on the base end side, as a locking portion deformation amount limiting unit 102 for limiting the amount of deformation of the outer peripheral side of the locking piece 74 is provided for. Incidentally, omitted in the present embodiment, wherein the first embodiment is substantially the same members and portions, in the drawing, denoted by the same reference numerals as the first embodiment, a detailed description .
[0080]
　That is, in this embodiment, in the internal space 70 of the enlarged diameter portion 64, the radial direction between the peripheral wall 58 and the engaging pieces 74, 74, respectively deformation amount limiting unit 102, 102 is provided. In short, the outer circumferential side of the engaging pieces 74, 74, the inner peripheral surface 65 of the large diameter portion 68, 68 constituting the enlarged diameter portion 64, the deformation amount limiting unit 102, 102 projecting proximally integral It is formed. In other words, the wall portion constituting the large-diameter portion 68, 68 in the enlarged diameter portion 64 is turned into the partially thick, deformation amount limiting unit 102, 102 are formed.
[0081]
　Incidentally, the enlarged diameter portion 64, since it has a shape extending gradually outer peripheral side toward the proximal side, the deformation amount limiting section 102 and 102, gradually radial dimension as the underlying end (11 in vertical dimension of) are such increases, in the longitudinal section shown in FIG. 11, has substantially a right triangle. Then, the inner peripheral surface of the deformation amount limiting section 102 and 102, engaging pieces 74 and 74 substantially parallel (i.e., the needle axis substantially parallel the indwelling needle 16) while being spread, the proximal end face is indwelling needle It extends in a direction substantially perpendicular to the 16 of the needle axis. Proximal face of such deformation amount limiting section 102 and 102, than the needle axial direction base end of the engaging piece 74, 74 (protruding end) is located in the needle axial direction distal end side, the amount of deformation restriction unit 102, 102 whole is accommodated in the interior space 70 of the enlarged diameter portion 64 of the.
[0082]
　In particular, in the present embodiment, each of the deformation amount limiting unit 102, 102, and a three projections 104,104,104 projecting from the inner circumferential surface 65 of the enlarged diameter portion 64 on the proximal end side. These three projections 104,104,104 are between wall portion constituting the small diameter portion 66 which is thick-walled as compared with the large-diameter portion 68, 68 (between the left and right direction in FIG. 10), the circumferential direction side by side are provided in, it is disposed spaced from each other.
[0083]
　These three projections 104,104,104 are at both engaging pieces 74 radially (vertically in FIG. 10), the front needle tip protective state (for example, see FIGS. 3 and 4) from the needle tip protective so as not to inhibit the movement of the needle tip protector 100 to state (e.g., see FIG. 7, 8) are provided at a suitable distance. Incidentally, the inner circumferential surface of the deformation amount limiting section 102 configured to include these three protrusions 104,104,104 is the outer peripheral surface substantially corresponding curved shape of the locking piece 74, 3 Tsuno突a Department 104,104,104 and locking pieces 74 are spaced with a substantially constant distance. Here, inhibiting the deformation of the distance between the projections 104,104,104 and locking piece 74, at the time of the movement to the tip side of the needle tip protector 100 for the needle unit 20, to the outer peripheral side of the locking piece 74 together it is set to a size that does not, the deformation amount of the engaging piece 74 at the time of bending deformation of the indwelling needle assembly 106 as described later abuts the deformation amount limiting unit 102 (projection 104,104,104) It is set to a size that in is restricted.
[0084]
　Further, in this embodiment, the proximal end surface 105, 105 of the engaging pieces 74, 74, the vertical surface 105a of the first shaft facing the axis-perpendicular dimension E in 105a (see FIG. 13), locking It is smaller than the axis-perpendicular direction of the dimension a at the base end regulating surface 40 of the recess 36 (the third axis facing). Thus, the end on the outer side α in the vertical surface 105a of the engaging piece 74 is located in the inner circumferential side than the end on the outer side of the base end side regulating surface 40 of the locking recesses 36 beta, such the end on the outer side α in the vertical surface 105a of the engaging pieces 74 is adapted to abut against the base side regulating surface 40. Incidentally, at the proximal end side end surface 105 and 105, inclined surface 105b positioned on the outer peripheral side of the vertical plane 105a, 105a, 105b, similarly to the first embodiment, inclined distally as made on the outer peripheral side there.
[0085]
　Indwelling needle needle tip protector 100 is a such a structure is, the the first embodiment and the needle unit 20, which is the same structure that is externally 挿装 wear, the indwelling needle assembly 106 (Figure of this embodiment 12 reference) are configured. Then, as in the first embodiment, and punctures the indwelling needle assembly 106, after puncturing, as shown in FIGS. 12 and 13, the needle tip protector 100 to the needle tip 14 of the indwelling needle 16 by causing moved, the needle tip 14 of the indwelling needle 16 is adapted to be protected by the needle tip protector 100. That is, the locking claws 78, 78 provided at the tip of the locking piece 74 is, is locked enters the engagement recess 36 provided at the end portion of the needle hub body 26, locking claws 78 by the 78 and the base end side regulating surface 40 is brought into contact with each other, with the movement of the distal end side of the needle unit 20 with respect to the needle tip protector 100 is adapted to be restricted, stepped surface 76 and the front end side by the regulating surface 42 is brought into contact with each other, proximal movement of the needle unit 20 with respect to the needle tip protector 100 is adapted to be limited.
[0086]
　In the present embodiment, since the deformation amount limiting section 102, 102 is provided on the outer peripheral side of the locking piece 74, in the protected state of the needle tip 14 of the indwelling needle 16, the locking claws 78 unintended disengaged from the engagement recess 36 can be effectively prevented. More specifically, for example under protective conditions of the needle tip 14, it is exerted bending direction of the external force to the entire needle tip protector 100 and the needle unit 20, and one of the locking piece 74 by the needle hub body 26 is pushed increasing deformed outwardly, the needle tip by the locking claw 78 of the other locking piece 74 is lifted outward from the base end regulating surface 40, the engaging piece 74 breaks off the locked state from being damaged or the like There hardly deny completely a possibility of re-exposure. Here, in the present embodiment, the amount of deformation of the outward engaging piece 74, from being restricted by the abutment against the deformation amount limiting section 102, even if they excessive bending force is applied, such re-exposure of the do unexpected needle tip can be effectively prevented.
[0087]
　Also in the indwelling needle needle tip protector 100 and the indwelling needle assembly 106 of the present embodiment, the same advantages as those in the first embodiment can be exhibited.
[0088]
　In particular, in the present embodiment, the deformation amount limiting unit 102, 102 is provided on the inner peripheral side of the large diameter portion 68, 68 in the enlarged diameter portion 64, to skillfully use the internal space 70 of the enlarged diameter portion 64 in, such as enlargement of the needle tip protector 100 due to the provision of the deformation amount restriction mechanism of the engaging pieces 74 and 74 may also be avoided.
[0089]
　Further, in the present embodiment, at the proximal side end surface 105, 105 of the engaging pieces 74, 74, a vertical surface 105a, the axis-perpendicular direction of the dimension E is at 105a, the shaft at the base end regulating surface 40 of the locking recesses 36 is smaller than a right angle dimension a, the end on the outer side α is adapted to be abutted against the base end regulating surface 40 in the vertical surface 105a of the engaging pieces 74. Thus, for example, when the needle tip protector 100 from the needle tip protective previous state is about to be forcibly moved proximally with excessive force, the locking claws 78 by the engaging piece 74 is deformed locking that deviate the locking rides the base end regulating surface 40 of the recess 36 is also effectively prevented. That is, the vertical surface 105a abuts the proximal side regulating surface 40 in the locking claws 78, since it is offset to the inner peripheral side from the central axis of the locking piece 74, the action of the bending moment due to the contact reaction force the engaging piece 74 is deformed in a curved shape that is convex outward, there is a possibility that the vertical surface 105a of the locking claw 78 is inclined. In the inclined state of a perpendicular surface 105a, the end of the vertical surface 105a alpha is positioned radially outward of the beta end of the proximal regulating surface 40, the end portion of the base end side regulating surface 40 beta is inclined by abutting a vertical surface 105a, there is a risk that the locking claw 78 from being released unintentionally is locked condition direction component force is generated to overcome the base end regulating surface 40. In contrast, in the present embodiment, even in a state where the vertical surface 105a is inclined claws 78, abutting the proximal end side regulating surface 40 is avoided for the inclined vertical face 105a, the end of the vertical surface 105a α is that abuts against the base end regulating surface 40, so that the effective locking force while avoiding the occurrence of Norikoshi direction component force can be stably exhibited.
[0090]
　Having thus described the embodiments of the present invention, the present invention is not to be construed as limiting the details of the illustrated embodiments, various changes based on the knowledge of those skilled in the art, modifications, improvements, etc. It can be implemented in an embodiment in which added.
[0091]
　For example, in the above embodiment, the engaging piece 74, 74 has had extended out toward the base end side, it may extend out toward the distal end side. In the above embodiment, the engaging piece 74 is in its entirety has been housed in the interior of the peripheral wall 58, for example, end of the engagement portion is located outward from the needle axial end of the peripheral wall it may be. Note that substantial catches in the locking portion (e.g., the locking claws 78 and 78 in the embodiment) need not be provided at the distal end of the locking portion.
[0092]
　Furthermore, in the above embodiment, the proximal end surface of the engaging pieces 74, 74 79, 79 (105, 105), while the inner circumference side is the vertical plane 79a, 79a (105a, 105), the outer peripheral side of the inclined face 79b, has been considered 79b (105b, 105b), but is not limited to such embodiments. That is, the base end side end surface 79, 79 (105, 105) of the engaging pieces 74, 74 are inclined surfaces 79b, 79b (105b, 105b) is not spread in the axis-perpendicular direction over substantially the entire surface without being provided it may be a vertical surface 79a, 79a (105a, 105a) may be extended in a direction inclined with respect to the axial direction over substantially the entire surface without being provided. Incidentally, the inclined surfaces 79b, 79b (105b, 105b) may be inclined distally as made on the outer peripheral side as in the embodiment, the vertical surfaces 79a, 79a (105a, 105a) and proximal end side unless interfering with the contact between the regulating surface 40 may be inclined proximally as made on the outer peripheral side. Further, the base end regulating surface 40 of the inner peripheral portion and the needle hub body 26 at the proximal side end surface of the engaging pieces 74, 74 79, 79 (105, 105), in place of such a vertical plane of the illustration, the outer periphery it is also possible to an inclined surface inclined distally as will side, whereby, although the base end side regulating surface 40 is undercut with an overhanging shape, also possible to obtain a larger movement restricting force become.
[0093]
　Furthermore, in the above embodiment, a pair of locking pieces 74, 74 is provided with diametrically opposed, to the locking portion may be one, or three or more. In this case, three or more engaging portions are preferably provided at substantially equal intervals in the circumferential direction. Alternatively, it may be a substantially cylindrical engaging portion extending continuously over the entire circumference. Incidentally, the engaging portion even when the provided two or more, need not be provided at equal intervals or circumferential direction are diametrically opposed. Moreover, the engagement recess provided in the needle hub body need not be provided continuously over the entire circumference, only to be provided at corresponding positions with the locking portion in the circumferential direction.
[0094]
　Furthermore, in the embodiment, the stepped surface 76 provided on the fixed end side of the engaging pieces 74, 74 in needle tip protector 10, 100, distal end restricting face provided on the needle hub 22 (the needle hub body 26) 42 and is that abut against each other, that is withdrawn from the base end side of the needle unit 20 from needle tip protector 10, 100 has been prevented, extraction-preventing mechanism of the needle unit to be limited to this mode is not. That is, these stepped surfaces 76 and distal end regulating surface 42 is not indispensable, an extraction mechanism for preventing the needle unit may be provided separately from these.
[0095]
　In the above embodiment, the stepped surface 76 and the base end side regulating surface 40, although such leading end side regulating surface 42 had spread in the axis-perpendicular direction, even if they have spread inclined to the axis-perpendicular direction good.
[0096]
　Furthermore, in the above embodiment, while the front end side of the needle tip protector 10, 100 is a cylindrical portion 62 having an annular cross-section, but the proximal side has been the elliptic cylindrical enlarged diameter portion 64, these shapes the present invention is not limited to. That is, the cross-sectional shape of the expanding portion of the distal and proximal side of the needle tip protector, respectively, circular various shapes such as (elliptical, oval, and includes such semicircular) or polygonal shape may be employed. However, expanded portion provided on the base end side of the needle tip protector is not indispensable, needle tip protector may be a tubular shape just straight.
[0097]
　Furthermore, the shape of the needle unit is not intended to be limiting. For example, in the embodiment, by connecting the needle hub 22 and needle tip protector 10, 100, that is, maintained a hook 56, 56 to the exposed configuration indwelling needle 16 is engaged to the through window 72, 72 , it is not limited to this mode. That is, the needle hub engaging portion need not be such through window shapes of the embodiments, or the like may be bottomed groove-shaped opening to the inner peripheral side. Or together with the hooks as a needle hub engaging portion is formed on the needle tip protector, such as through a window or bottomed grooves in the needle hub may be formed. However, such hooks and through window is not indispensable, short coupling mechanism between the needle hub and the needle tip protector before use is not essential.
[0098]
　In the above embodiment, although the wings 80 are attached to the needle tip protector 10, 100, wings is not essential.
[0099]
　Furthermore, in the second embodiment, the deformation amount limiting section 102, 102 has been integrally formed on the enlarged diameter portion 64 of the needle tip protector 100, may be post-fixed are formed separately. Thereby, the needle tip protector, for example deformation amount limiting portion can also be formed of different materials.
[0100]
　Furthermore, in the second embodiment, the deformation amount limiting section 102, 102 has been provided on the inner peripheral surface 65 of the wall portion constituting the large-diameter portion 68, 68 in the enlarged diameter portion 64, the deformation amount forming position of the limiting portion is not limited any way. That is, the deformation amount restriction unit, for example from the inner peripheral surface of the wall portion constituting the small diameter portion of the enlarged diameter portion, provided so as to protrude toward the outer circumferential side of the engaging portion (engaging pieces 74, 74) it may be. However, the amount of deformation restriction unit is not intended to be limited to the embodiments provided on the inner peripheral surface of the enlarged diameter portion, for example, provided on the outer peripheral surface of the engaging portion, when the elastic deformation of the outer peripheral side of the locking portion by contact with the inner peripheral surface of the enlarged diameter portion, it may be adapted that deformation is limited.
[0101]
　Further, the invention is not limited any way the shape of the deformation amount limiting portion. Collision In the second embodiment, the deformation amount limiting section 102, 102 has been substantially right-angled triangular longitudinal section, for example, projecting from the inner peripheral surface of the enlarged diameter portion on the base end side and inner peripheral side it may be a flake, or may be a protrusion shape protruding on the outer peripheral side from the outer peripheral surface of the locking portion (locking piece 74). Furthermore, in the second embodiment, the deformation amount limiting section 102, 102, had been constructed from each of the three projections 104,104,104, is not limited to this mode, two 1 gloss it may be composed of four or more projections. In this way, the deformation amount limiting unit 102, 102 by configuring a plurality of projections, such as shortening of molding time due to the improvement of suppression and cooling efficiency of the shrinkage after molding (deformation due to thermal shrinkage) is achieved . In particular, as described above in the second embodiment, by constituting the deformation amount limiting unit 102, 102 in each of the three projections 104,104,104, in addition to the effect is stably exhibited, the shape of the mold becomes too complicated it may also be avoided.
[0102]
　Furthermore, in the second embodiment, the two engaging pieces 74, 74 are provided, although the amount of deformation limiting portions 102, 102 is provided on the outer peripheral side of each of the locking pieces 74, 74, deformation amount limiting unit may only be provided on the outer peripheral side of one of the locking portion (locking piece 74). Further, when the engaging portion is provided two or more, although the deformation amount limiting portion on the outer peripheral side of each of the engaging portions are provided is preferred, deformation of the outer peripheral side of the at least one stop limiting unit is only to be provided.
DESCRIPTION OF SYMBOLS
[0103]
10,100: indwelling needle needle tip protector, 12,106: the indwelling needle assembly, 14: tip, 16: indwelling needle, 22: needle hub 40: the base end side regulating surface (third engagement portion, the triaxial face), 42: front end side regulating surface (fourth engaging portion, the fourth shaft face), 58: peripheral wall, 64: diameter-enlarged portion (expanded portion), 66: small diameter portion, 68: large diameter portion, 72: through window (needle hub engaging portion), 74: engaging piece (engaging portion), 76: stepped surface (second engagement portion, the second shaft face), 78: locking pawl (first engaging stop unit), 79,105: the base end side end face, 79a, 105a: vertical plane (the first axis facing), 102: deformation amount limiting section

WE claims

[Requested item 1]
　Includes a cylindrical peripheral wall, a needle tip protector that covers the needle tip of the indwelling needle by moving the outer挿装wear needle hub of the indwelling needle to the needle tip side,
　the needle tip side of the indwelling needle locked to the needle hub in the movement position of the locking portion for preventing re-exposure of the needle tip by preventing retraction of the proximal side of the indwelling needle, covered by the tubular wall We were with formed therein, the indwelling needle needle tip protector engaging portion is characterized in that it is formed integrally with the cylindrical peripheral wall.
[Requested item 2]
　The locking portion is indwelling needle needle tip protector of claim 1 that extends toward the base end side of the peripheral wall in the tubular inner wall.
[Requested item 3]
　The engagement entire locking portion, indwelling needle needle tip protector of claim 1 or 2 being a stowed inside covered with the tubular wall.
[Requested item 4]
　And expanding portion extending to the outer periphery is provided at the base end side of the tubular wall, according to any one of the locking portion is being claims 1 to 3, provided in the the enlarged opening portion indwelling needle for the needle tip protector.
[Requested item 5]
　The front end portion of the expanding portion, and stepped surface extending to the outer peripheral side toward the front is provided in an inner peripheral surface of the cylindrical peripheral wall, a rear end of the enlarged opening portion than stepped shape surface needle tip protector for indwelling needle according to claim 4, wherein the locking portion toward the rear is formed to protrude in part.
[Requested item 6]
　The expanding portion are substantially elliptical cylindrical shape with a small diameter portion and a large diameter portion which are perpendicular to each other, together with the locking portion inside covered with the peripheral wall of the large diameter portion is provided , for indwelling needle according to claim 4 or 5 needle hub engaging portion needlepoint of the indwelling needle the needle hub in the circumferential wall of the large diameter portion is engaged is held in the projecting state is provided needle tip protector.
[Requested item 7]
　The tubular wall indwelling needle needle tip protector as claimed in any one of claims 1 to 6, spaced apart from the plurality of the locking portions are provided each other in the circumferential direction of the.
[Requested item 8]
　Free end extending from the tubular wall at the locking section prevents the needle tip re-exposed by the movement of the needle point side of the indwelling needle in the cylindrical inside wall by locking to said needle hub together they are a first locking portion, fixed end which is integrally supported by a tubular peripheral wall in the locking unit, the placement in the cylindrical inside wall by engagement of the needle hub indwelling needle needle tip protector as claimed in any one of the second locking portion and has been that claims 1 to 7, to prevent the withdrawal needle by movement of the needle to the proximal side.
[Requested item 9]
　The locking portion indwelling needle needle tip protector as claimed in any one of the deformation amount according to claim 1, limiting portion is provided to 8 for limiting the amount of deformation of the outer peripheral side of the.
[Requested item 10]
　Against claims 1-9 or 1 indwelling needle needle tip protector according to Section indwelling needle having a needle hub on the proximal end side is movably inserted in the axial direction, of the indwelling needle at a predetermined position where the needle destination protector was moved to the needle point side, again of the needle tip of the indwelling needle by the locking portion provided in the needle destination protector is locked against needle hub indwelling needle assembly and the exposure is to be prevented.
[Requested item 11]
　Needle by movement of said locking free end extending toward the proximal side from said cylindrical wall at the end side, the engagement of the said needle hub to the indwelling needle needlepoint side at the cylindrical inside wall together are a first locking portion for preventing the above re-exposure, the fixed end side which is integrally supported by a tubular peripheral wall in the locking portion is cylindrical in the engagement of the needle hub while there is a second locking portion for preventing the withdrawal needle by movement to said indwelling needle proximal in the peripheral wall,
　and the engagement recess is provided on the needle hub, the locking recess the indwelling needle assembly according to claim 10, the third engagement portion to which an engaging portion said is locked by the inner surface of the base end side is configured.
[Requested item 12]
　It said locking free end extending toward the proximal side from said cylindrical wall at the side are a first locking portion, the relative third engaging portion provided on an outer peripheral surface of the needle hub by first locking portion is locked, while the needle tip re-exposed by the movement of the needle point side of the indwelling needle in the cylindrical inside circumferential wall is adapted to be blocked,
　said first proximal end surface of the locking portion, together with has a first shaft face intersecting at a right angle to the needle axis direction of the indwelling needle,
　three locking portions said that the needle axis of the indwelling needle the indwelling needle assembly according to claim 10 or 11 has a third axis face intersecting at right angles to.
[Requested item 13]
　An end portion of the outer peripheral side of the needle tip protector of the first shaft facing the first locking portion, the inner than the end on the outer side of the third shaft face of the needle hub provided on the needle hub the indwelling needle assembly according to claim 12 which is located on the peripheral side.