JP2021037105A - Needle assembly - Google Patents

Abstract

To provide a novel needle assembly which can prevent unintended falling of a needle tip protector from a needle hub.SOLUTION: A needle assembly 10 includes: a puncture needle 14; a needle hub 18 supporting a proximal end part of the puncture needle 14; a protruding part 26 provided on an outer peripheral surface of the needle hub 18; and a needle tip protector 16 covering a needle tip 12 of the puncture needle 14 by moving in a needle axis direction relative to the puncture needle 14. The needle tip protector 16 has a flexible piece 60 for restricting movements of the needle tip protector 16 in the needle axis direction by abutting on the protruding part 26; and a hole part 74 configured that a distal end part of the needle hub 18 can be inserted, and that an inner dimension at a site where the flexible piece 60 is formed is equal to or less than an external dimension at a site where the protruding part 26 of the needle hub 18 is formed. Getting-over of the protruding part 26 from a proximal end side to a distal end side of the flexible piece 60 can be allowed by outward elastic deformation of the flexible piece 60.SELECTED DRAWING: Figure 3

Description

The present invention relates to a needle assembly including a puncture needle that is punctured into a blood vessel and a needle tip protector that covers the needle tip of the puncture needle after use.

Conventionally, a needle assembly including a puncture needle used for infusion, blood collection, and hemodialysis and a needle tip protector for covering the needle tip of the puncture needle after use has been known. For example, in Japanese Patent Application Laid-Open No. 2017-196060 (Patent Document 1), a protector is provided so as to be movable in the needle axis direction of the needle tube, and by moving to a position covering the needle tip of the needle tube after use, the needle tube can be moved. The needle tip is protected.

JP-A-2017-196060

By the way, the needle assembly of Patent Document 1 is configured by assembling a hub and a protector on which a needle tube is supported, but the protector can be removed from the hub by rotating the protector and the hub relative to each other around the central axis. It turned out that it could be. Therefore, for example, if a medical person unintentionally performs such an operation, erroneous puncture may occur.

An object of the present invention is to provide a novel needle assembly capable of preventing the needle tip protector from being unintentionally dropped from the needle hub.

Hereinafter, preferred embodiments for grasping the present invention will be described, but each of the embodiments described below is described as an example, and not only can be appropriately combined with each other and adopted, but also described in each embodiment. The plurality of components of the above can also be recognized and adopted independently as much as possible, and can be appropriately adopted in combination with any of the components described in another embodiment. Thereby, in the present invention, various other aspects can be realized without being limited to the aspects described below.

The first aspect is to move the puncture needle, the needle hub that supports the base end portion of the puncture needle, the convex portion provided on the outer peripheral surface of the needle hub, and the puncture needle in the needle axis direction. A needle assembly including a needle tip protector that covers the needle tip of the puncture needle, and the needle tip protector restricts the movement of the needle tip protector in the needle axis direction by abutting with the convex portion. A flexible piece and a hole in which the tip of the needle hub can be inserted and the internal dimension at the site where the flexible piece is formed is equal to or less than the external dimension at the site where the convex portion of the needle hub is formed. The convex portion can be overcome from the base end side to the tip end side of the flexible piece by elastic deformation to the outside of the flexible piece.

According to the needle assembly of this embodiment, the flexible piece is elastically deformed outward so that the convex portion can get over the flexible piece from the proximal end side to the distal end side, and the needle tip protector can be attached to the needle hub. After mounting, even if the needle tip protector and the needle hub are rotated relative to each other around the central axis, the convex portion does not get over the flexible piece from the tip side to the base end side, and the needle tip protector from the needle hub Dropping can be prevented.

In the second aspect, in the needle assembly according to the first aspect, the tip surface of the convex portion in the needle axis direction is an inclined surface whose protrusion dimension from the outer peripheral surface of the needle hub gradually decreases toward the tip side. Is included.

According to the needle assembly of this embodiment, for example, by assembling the needle hub to the needle tip protector from the base end side, the flexible piece can be elastically deformed so as to be pushed outward by the inclined surface of the convex portion.

A third aspect is the needle assembly according to the first or second aspect, wherein the convex portion includes an annular convex portion provided on the outer peripheral surface of the needle hub over the entire circumference in the circumferential direction. ..

According to the needle assembly of this embodiment, the elastic deformation of the flexible piece to the outside can be caused over the entire circumference in the circumferential direction, and the needle hub and the needle tip protector are aligned in the circumferential direction. It can also be assembled without.

A fourth aspect is that in the needle assembly according to any one of the first to third aspects, the flexible piece is a pair of first projecting pieces facing each other in the radial direction and the pair of first protrusions. It is configured to include at least one of a pair of second projecting pieces facing each other in a direction orthogonal to the facing direction of the projecting pieces.

According to the needle assembly of this embodiment, the contact between the pair of first projecting pieces and / or the pair of second projecting pieces and the convex portion makes it more reliable to restrict the movement of the needle tip protector with respect to the needle hub. Can be achieved.

A fifth aspect is the needle assembly according to any one of the first to fourth aspects, wherein the needle hub is external to the base end side of the tubular mounting portion to which the puncture needle is mounted at the tip end. The pipeline connection portion connected to the pipeline is integrally formed.

According to the needle assembly of this embodiment, the number of parts and the cost can be reduced.

A sixth aspect is at least one of the first convex portion and the second convex portion that restricts the movement of the needle tip protector in the needle axial direction in the needle assembly according to any one of the first to fifth aspects. The flexible piece is formed by one of the convex portions, and is formed by at least one of a first projecting piece that abuts on the first convex portion and a second projecting piece that abuts on the second convex portion. The first projecting piece has a slit extending straight over the entire length in the needle axis direction, and the second convex portion is partially provided in the circumferential direction. The circumferential width dimension of the second convex portion is equal to or larger than the circumferential width dimension of the second convex portion.

According to the needle assembly of this embodiment, when assembling the needle hub and the needle tip protector, the second convex portion is formed from the base end side of the first projecting piece through a slit provided in the first projecting piece. It can be moved to the tip side, and the second convex portion can smoothly get over the flexible piece without elastic deformation of the flexible piece.

A seventh aspect is at least one of the first convex portion and the second convex portion that restricts the movement of the needle tip protector in the needle axial direction in the needle assembly according to any one of the first to sixth aspects. The flexible piece is formed by one of the convex portions, and is formed by at least one of a first projecting piece that abuts on the first convex portion and a second projecting piece that abuts on the second convex portion. The first projecting piece has a pair of split bodies separated from each other in the circumferential direction, and is straight between the pair of split bodies over the entire length in the needle axis direction. An extending slit is configured, the needle hub has a ridge fitted into the slit, and the circumferential width dimension of the ridge is greater than or equal to the circumferential dimension of the split body.

According to the needle assembly of this aspect, elastic deformation of the split body is less likely to occur by reducing the circumferential dimension of the split body, and the ridges fitted in the slits elastically deform the split body. The risk of slipping out of the slit can be reduced.

In the eighth aspect, in the needle assembly according to the sixth or seventh aspect, the base end surface of the first convex portion includes a plurality of contact surfaces that abut the flexible piece.

According to the needle assembly of this embodiment, the first convex portion contacts the first projecting piece with a sufficient contact area, so that the movement of the needle tip protector with respect to the needle hub in the needle axial direction is more reliable. Can be limited to.

According to the present invention, it is possible to provide a needle assembly capable of more reliably preventing the needle tip protector from falling off from the needle hub.

Top view showing the needle assembly as one embodiment of the present invention in an exposed state of the needle tip. It is a vertical sectional view of the needle assembly shown in FIG. 1, and is the II-II sectional view in FIG. Section III-III sectional view in FIG. A cross-sectional view showing an enlarged view of the IV-IV cross section in FIG. Top view of the needle hub constituting the needle assembly shown in FIG. Front view of the needle hub shown in FIG. VII-VII sectional view in FIG. VIII-VIII sectional view in FIG. A cross-sectional view showing an enlarged cross section of IX-IX in FIG. Longitudinal cross-sectional view of the needle tip protector constituting the needle assembly shown in FIG. XI-XI sectional view in FIG. Top view showing the needle assembly shown in FIG. 1 in a protected state of the needle tip. It is a vertical sectional view of the needle assembly shown in FIG. 12, and is the XIII-XIII sectional view of FIG. XIV-XIV sectional view in FIG. It is a vertical cross-sectional view which shows the state in the process of getting over the flexible piece (the first projecting piece) by the 1st convex part at the time of assembling the needle hub and the needle tip protector, and is shown in the XV-XV cross section in FIG. Corresponding figure A vertical cross-sectional view showing a state in which the flexible piece (second projecting piece) is being overcome by the second convex portion when the needle hub and the needle tip protector are assembled. It is a figure which shows another aspect of the needle assembly which concerns on this invention, (a) is a vertical sectional view which shows the main part of the needle tip protector which constitutes a needle assembly, and (b) is a needle assembly. Front view showing the main part of the needle hub that constitutes It is a figure which shows still another aspect of the needle assembly which concerns on this invention, (a) is a vertical sectional view which shows the main part of the needle tip protector which constitutes a needle assembly, and (b) is a needle assembly. Front view showing the main parts of the needle hub that constitutes the solid FIG. 8 is a cross-sectional view of the needle assembly shown in FIG. 18 and corresponds to FIG.

Hereinafter, in order to clarify the present invention in more detail, embodiments of the present invention will be described in detail with reference to the drawings.

First, FIGS. 1 to 4 show an indwelling needle assembly 10 used for, for example, infusion or dialysis, as one embodiment of the needle assembly according to the present invention. The indwelling needle assembly 10 includes an indwelling needle 14 as a puncture needle having a needle tip 12 on the tip end side, and a needle tip protector 16 that can move in the needle axis direction of the indwelling needle 14. Then, after the indwelling needle assembly 10 is used, the needle tip protector 16 moves to the tip side to cover the needle tip 12, so that the needle tip protector 16 protects the needle tip 12 of the indwelling needle 14. There is. In the following description, the needle axis direction refers to the left-right direction in FIG. 1, which is the central axis direction of the indwelling needle 14. Further, the tip end side refers to the left side in FIG. 1 which is the needle tip 12 side of the indwelling needle 14, and the proximal end side is the side supported by the needle hub 18 in the indwelling needle 14 in FIG. Refers to the right side. Further, the upper side means the front direction of the paper surface in FIG. 1 which is the upper side (opposite side to the patient's skin) when the indwelling needle 14 is punctured, and the lower side means the lower side (the patient's skin side) when the indwelling needle 14 is punctured. ) In the direction of the back of the paper in FIG.

More specifically, the indwelling needle 14 is, for example, a hollow metal needle, and is made of stainless steel or the like. The needle tip 12 of the indwelling needle 14 is tapered and has a sharp shape, and the base end portion is supported by the needle hub 18.

As shown in FIGS. 5 to 9, the needle hub 18 has a substantially tubular shape as a whole, and can be preferably formed of, for example, a hard synthetic resin. A tubular mounting portion 20 into which the base end portion of the indwelling needle 14 is inserted is provided on the tip end side of the needle hub 18, and an external tube such as a tube or catheter extending from a chemical solution bag or the like is provided on the base end side. A pipeline connecting portion 24 to which the road 22 (see FIG. 2) is connected is provided. In the present embodiment, the tubular mounting portion 20 and the pipeline connecting portion 24, which are both substantially tubular, are integrally molded and communicate with each other.

Further, in the present embodiment, the tubular mounting portion 20 has a substantially cylindrical shape, and the base end portion of the indwelling needle 14 is inserted into the tip end portion of the tubular mounting portion 20 in a press-fitted state, for example. The base end portion of the indwelling needle 14 is supported by the needle hub 18 by being adhered or welded accordingly. When the base end portion of the indwelling needle 14 is supported by the needle hub 18, the indwelling needle 14 may be fixed with an acrylate-based resin material such as an epoxy-based or urethane acrylate.

Further, the outer peripheral surface of the needle hub 18 is provided with a first convex portion 26 as a convex portion protruding toward the outer peripheral side. In the present embodiment, the first convex portion 26 is provided at the tip end portion of the needle hub 18 (cylindrical mounting portion 20). In particular, in the present embodiment, the first convex portion 26 is an annular convex portion provided on the outer peripheral surface of the needle hub 18 over the entire circumference in the circumferential direction. The first convex portion 26 may be provided at a position separated from the tip of the needle hub 18 to some extent on the proximal end side.

Further, in the present embodiment, the tip surface of the first convex portion 26 includes an inclined surface 28 whose protrusion dimension from the outer peripheral surface of the needle hub 18 gradually decreases toward the tip side. That is, in the present embodiment, substantially the entire surface of the tip surface of the first convex portion 26 is an inclined surface 28, but for example, the inner peripheral side of the tip surface of the first convex portion is a vertical surface extending in the direction perpendicular to the axis. Therefore, the outer peripheral side may be an inclined surface whose protruding dimension gradually decreases toward the tip side. In particular, in the present embodiment, since the first convex portion 26 is an annular convex portion, the tip surface of the first convex portion 26 is an annular tapered surface whose diameter gradually decreases toward the tip side. ing. On the other hand, the base end surface of the first convex portion 26 is an annular vertical surface 29 extending in the direction perpendicular to the axis.

Furthermore, on the outer peripheral surface of the needle hub 18 (cylindrical mounting portion 20), a second convex portion 30 as a convex portion is provided on the proximal end side of the first convex portion 26. In the present embodiment, the second convex portion 30 is partially provided in the circumferential direction. In particular, in the present embodiment, a pair of second convex portions are provided on both sides in the left-right direction (both sides in the vertical direction in FIG. 5). 30, 30 are provided so as to project. The first convex portion 26 and the second convex portion 30 are separated to some extent in the axial direction. The second convex portion 30 has a substantially rectangular shape in the front view shown in FIG. 6, for example. The tip surface of the second convex portion 30 is a vertical surface 31 extending in the direction perpendicular to the axis, and the base end surface of the second convex portion 30 has a protrusion dimension from the outer peripheral surface of the needle hub 18 as the base end. The inclined surface 32 gradually becomes smaller toward the side. In the present embodiment, the protrusion dimension of the needle hub 18 from the outer peripheral surface of the first convex portion 26 and the protrusion dimension of the needle hub 18 from the outer peripheral surface of the second convex portion 30 are substantially equal.

Further, on the outer peripheral surface of the needle hub 18, the base end portion of the tubular mounting portion 20 (the boundary portion between the tubular mounting portion 20 and the pipeline connecting portion 24) has a taper that gradually increases in diameter toward the base end side. A surface 34 is provided.

Further, on both sides of the outer peripheral surface of the needle hub 18 in the vertical direction, from the tip end to the base end of the tubular mounting portion 20, that is, from the first convex portion 26 to the conduit connecting portion 24 in the present embodiment. A pair of ridges 36, 36 extending substantially straight in the axial direction are provided. In particular, in the present embodiment, the maximum protruding height of the needle hub 18 from the outer peripheral surface of the first convex portion 26 and the protruding height of the needle hub 18 from the outer peripheral surface of the ridge 36 are substantially equal. The protruding tip surface (outer peripheral surface) of the convex portion 26 of 1 and the protruding tip surface (outer peripheral surface) of the ridge 36 are continuous with substantially no step.

Furthermore, the ridge 36 is provided so as to extend to the base end surface (vertical surface 29) of the first convex portion 26. Therefore, as shown in FIG. 9, the base end surface (vertical surface 29) of the first convex portion 26 is in contact with a flexible piece (first projecting piece 60) described later, which is partitioned by the ridge 36. It is configured to include a plurality of contact surfaces (a pair in this embodiment) of contact surfaces 37 and 37. In the present embodiment, since the base end surface (vertical surface 29) of the first convex portion 26 is annular, the contact surfaces 37 and 37 are arcuate surfaces having a circumferential dimension of half a circumference or less. There is. With such a configuration, it becomes easy to prevent the needle tip protector 16 from falling off from the needle hub 18.

Further, in the present embodiment, the pipeline connecting portion 24 has a substantially cylindrical shape, and the external pipeline 22 is inserted from the opening on the proximal end side of the pipeline connecting portion 24 and is bonded or welded as necessary. As a result, the external pipeline 22 is connected to the needle hub 18. In particular, in the present embodiment, a substantially annular insertion recess 24a is provided on the base end surface of the pipeline connecting portion 24, and a substantially annular cylinder protruding toward the base end is provided on the inner peripheral edge of the bottom of the insertion recess 24a. A connection cylinder portion 24b in the shape of a shape is provided. That is, the inner hole of the pipeline connecting portion 24 and the inner hole of the connecting cylinder portion 24b communicate with each other. Then, the tip portion of the external pipeline 22 is inserted into the insertion recess 24a while being extrapolated to the connecting cylinder portion 24b, so that the external pipeline 22 and the pipeline connecting portion 24 are connected. .. Further, in the present embodiment, the connection cylinder portion 24b projects to the proximal end side from the proximal end surface (opening of the insertion recess 24a) of the pipeline connecting portion 24.

On the outer peripheral surface of the pipeline connecting portion 24, a pair of engaging arms 38, 38 protruding toward the tip side with a predetermined width dimension are integrally formed on both sides in the radial direction (both sides in the vertical direction in FIG. 5). There is. In the present embodiment, the horizontal dimension of the pipeline connecting portion 24 is larger than the other portions at the base end portion, and the conduit connecting portion 24 is engaged from both ends of the portion enlarged in the left-right direction toward the tip end side. The arm 38 is protruding. That is, in the present embodiment, the connecting cylinder portion 24b projects from the proximal end portion (connecting portion with the pipeline connecting portion 24) of the engaging arm 38 to the proximal end side. Further, the pipeline connecting portion 24 of the present embodiment has a substantially horizontally long outer shape in which the horizontal dimension is larger than the vertical dimension in the overall shape including the engaging arms 38 and 38.

The engaging arm 38 has a substantially rectangular shape in the front view shown in FIG. 6 and the like, and has a plate thickness dimension (vertical dimension in FIG. 5) at the base end portion (connecting portion with the pipeline connecting portion 24). ) And the width dimension (vertical dimension in FIG. 6) are thin, and there is a slit-shaped gap between the conduit connection portion 24 and the portion located on the inner peripheral side of the engaging arm 38 in the radial direction. 40 is formed. As a result, the engaging arm 38 can be elastically deformed in the plate thickness direction. Further, a hook 42 projecting to the outer peripheral side is formed at the tip end portion of the engaging arm 38.

As shown in FIGS. 10 and 11, the needle tip protector 16 has a substantially tubular shape extending in the needle axis direction as a whole, such as polypropylene, polycarbonate, glycol-modified polyethylene terephthalate, ABS resin, MBS resin, and the like. It is integrally molded with a hard synthetic resin. That is, the needle tip protector 16 includes a tubular peripheral wall 44 and an inner hole 46 penetrating the inside of the peripheral wall 44 in the needle axis direction.

The needle tip protector 16 (peripheral wall 44) has a different shape in the needle axis direction, and has a larger external dimension on the proximal end side than on the distal end side. More specifically, the tip side is a tubular portion 48 having a substantially circular ring shape in cross section, and the base end side is an enlarged portion 50 having a diameter larger than that of the tubular portion 48 and extending to the outer circumference. There is. In the present embodiment, the horizontal dimension (vertical dimension in FIG. 10) of the enlarged portion 50 is larger than the vertical dimension (vertical dimension in FIG. 11), and the outer shape of the enlarged portion 50 is horizontally long. It has a substantially elliptical shape.

On both sides of the enlarged portion 50 in the left-right direction, openings 52 extending in the axial direction are formed. That is, in the present embodiment, the upper side wall portion 54 constituting the enlarged portion 50 is integrally molded on the upper side of the base end portion of the tubular portion 48, and the lower side wall portion 56 constituting the enlarged portion 50 is a tubular portion. The upper side wall portion 54 and the lower side wall portion 56 are integrally molded on the lower side of the base end portion of the 48, and are connected by the connecting portion 58 at the base ends of the left and right end portions of the enlarged portion 50. As a result, in the space between the upper side wall portion 54 and the lower side wall portion 56 on both the left and right sides of the enlarged portion 50 in the vertical direction, the opening 52 is formed by the portions not connected by the connecting portion 58.

Further, on the inner peripheral side of the upper side wall portion 54 and the lower side wall portion 56 constituting the enlarged portion 50, a pair of flexible pieces are separated from the upper side wall portion 54 and the lower side wall portion 56 in the vertical direction. The first projecting pieces 60, 60 are integrally formed and face each other in the vertical direction. These first projecting pieces 60 are thin-walled leaf springs, and are elastically deformable in the vertical direction. As shown in FIGS. 4 and 10, the first projecting piece 60 has a substantially rectangular shape when projected in the vertical direction, and the tip surface and the base end surface of the first projecting piece 60 are formed. The vertical surfaces 61a and 61b extend in the direction perpendicular to the axis, respectively.

A slit 62 extending substantially straight in the axial direction is formed at substantially the center of the first projecting piece 60 in the left-right direction. As a result, the first projecting piece 60 is configured to include a pair of divided bodies 60a and 60a that are separated from each other in the circumferential direction around the central axis (left-right direction in the present embodiment). That is, a slit 62 is formed in the first projecting piece 60 over substantially the entire length of the first projecting piece 60, and the slit 62 is provided between the pair of divided bodies 60a and 60a facing each other. There is. In the present embodiment, the circumferential width dimension W _{1 (see FIG. 10) of the slit 62 is smaller than the circumferential width dimension W 2} (see FIG. 6) of the second convex portion 30, and the second convex portion 30 will be described later. At the time of contact between the projecting piece 60 of 1 and the second convex portion 30, the second convex portion 30 cannot pass through the slit 62.

Further, the circumferential width dimension W ₁ of the slit 62 is substantially equal to or slightly larger than the circumferential width dimension W _{3 (see FIG. 5) of the ridge 36.}

In particular, in the present embodiment, the circumferential width dimension W ₁ of the slit 62 is smaller than the circumferential dimension (horizontal dimension in this embodiment) W ₄ (see FIG. 10) of the divided body 60a, that is, circumferential width W ₃ of the protrusion 36 is smaller than the circumferential dimension W ₄ of the split body 60a. As a result, when the ridges 36 come into contact with the divided bodies 60a and 60a from the inside as described later, the divided bodies 60a and 60a are easily elastically deformed to the outside.

Further, in the base end portion of the tubular portion 48, the portions on both sides in the vertical direction constitute the upper side wall portion 54 and the lower side wall portion 56 of the enlarged portion 50 as described above, while the portions on both sides in the left and right direction are formed. It protrudes into the enlarged portion 50. In particular, the portions on both sides in the left-right direction at the base end portion of the tubular portion 48 are inclined in a direction approaching each other toward the proximal end side, and the portions on both sides in the left-right direction at the proximal end portion of these tubular portions 48. As a result, a pair of second projecting pieces 64, 64 as flexible pieces are formed. That is, these pair of second projecting pieces 64, 64 face each other in the left-right direction. In the present embodiment, the second projecting piece 64 projects to the proximal end side of the first projecting piece 60 and does not project toward the proximal end side of the opening on the proximal end side of the enlarged portion 50. It is housed and arranged in the enlarged portion 50. Further, in the present embodiment, the protruding tip surface (axial base end surface) of the second projecting piece 64 is a vertical surface 65 extending in the direction perpendicular to the axis.

Here, the internal dimension A (see FIG. 11) at the formation site of the first projecting piece 60 of the needle tip protector 16, that is, the facing distance A of the upper and lower first projecting pieces 60, 60 is the first of the needle hub 18. It is made smaller than the external dimension B (see FIG. 5) at the forming portion of the convex portion 26 and / or the second convex portion 30, that is, the maximum protruding dimension B of the first convex portion 26 and the second convex portion 30. (A <B). Further, the inner dimension C (see FIG. 10) at the formation site of the second projecting piece 64 of the needle tip protector 16, that is, the minimum facing distance C of the left and right second projecting pieces 64, 64 is the first of the needle hub 18. It is made smaller than the external dimension B at the forming portion of the convex portion 26 and / or the second convex portion 30 of 1 (C <B). It should be noted that any one of the above internal dimensions A and C does not have to be smaller than the external dimension B.

The minimum facing distance C of the left and right second projecting pieces 64, 64 is the outer diameter dimension of the tubular mounting portion 20 (the outer diameter dimension of the portion other than the convex portion, that is, the first convex portion 26 and the second convex portion 26). It is substantially equal to the outer diameter dimension of the portion other than the forming portion of the convex portion 30), and may be slightly larger or slightly smaller than, for example, the outer diameter dimension of the tubular mounting portion 20. .. In the needle tip protector 16, the inner diameter of the tubular portion 48 (that is, the inner diameter of the portion where the first and second projecting pieces 60 and 64 are not provided) is outside the maximum of the first convex portion 26. It is approximately equal to or slightly larger than the diameter dimension.

Further, in the present embodiment, a wing-shaped portion 66 is provided at the tip end portion of the needle tip protector 16. That is, a fitting cylinder portion 72 having a pair of blade bodies 70, 70 is externally fitted to a portion of the tip portion of the cylindrical portion 48 whose diameter is partially reduced, via connecting portions 68, 68. The wing-shaped portion 66 is attached to the tip end portion of the needle tip protector 16 by adhering or welding the tubular portion 48 and the fitting tubular portion 72 accordingly. The wing-shaped portion 66 is formed of, for example, a soft synthetic resin.

The indwelling needle assembly 10 of the present embodiment is configured by assembling the needle hub 18 on which the indwelling needle 14 is supported and the needle tip protector 16 as described above. The method of assembling the needle hub 18 and the needle tip protector 16 will be described in detail later, and the method of using the indwelling needle assembly 10 will be described first.

As shown in FIGS. 1 to 4, in the indwelling needle assembly 10 in the initial state (state before use), the tubular mounting portion 20 of the needle hub 18 is inserted through the needle tip protector 16, and the needle tip protector 16 is inserted. The indwelling needle 14 protrudes from the tip of the needle 14 to expose the needle tip 12. In the assembled state of the needle hub 18 and the needle tip protector 16, the second convex portion 30 and the second projecting piece 64, and the protrusion 36 and the slit 62 of the first projecting piece 60 are respectively in the circumferential direction. The position is aligned, and the protrusion 36 is inserted into the slit 62 to prevent the needle hub 18 and the needle tip protector 16 from rotating relative to each other in the circumferential direction. However, by rotating the needle hub 18 and the needle tip protector 16 relative to each other with a large torque around the central axis, the split body 60a is elastically deformed by the ridge 36, forcing the needle hub 18 and the needle tip protector 16. It is also possible to rotate relative to each other.

Further, by inserting the needle hub 18 into the needle tip protector 16, the second projecting piece 64 of the needle tip protector 16 slides on the outer peripheral surface of the tubular mounting portion 20 of the needle hub 18 toward the proximal end side. In the initial state shown in FIGS. 1 to 4, the second projecting piece 64 is in contact with the tapered surface 34 provided at the base end of the tubular mounting portion 20. This prevents further axial displacement of the needle hub 18 and the needle tip protector 16.

Further, in the initial state, the hook 42 at the tip of the engaging arm 38 provided on the needle hub 18 has entered the enlarged portion 50 of the needle tip protector 16 and is locked to the connecting portion 58. As a result, the relative displacement of the needle hub 18 and the needle tip protector 16 in the axial direction is prevented. Therefore, in the initial state, the needle tip protector 16 is locked to the needle hub 18 in the exposed state of the needle tip 12 of the indwelling needle 14, and the exposed state of the needle tip 12 is maintained.

In this state, the indwelling needle 14 is punctured into the patient's blood vessel and indwelled, and the drug solution is injected into the patient's body through the external conduit 22 connected to the conduit connecting portion 24. After injecting the drug solution, the needle tip protector 16 is moved to the tip side of the indwelling needle 14 removed from the patient's blood vessel to cover the needle tip 12, and the needle tip protector 16 protects the needle tip 12 of the indwelling needle 14. Will be done. The protection state of the needle tip 12 of the indwelling needle 14 by the needle tip protector 16 is shown in FIGS. 12 to 14.

That is, by pressing the engaging arms 38, 38 of the needle hub 18 inward in the opposite direction, the lock of the hook 42 with respect to the connecting portion 58 is released, and the needle tip protector 16 and the needle hub 18 are mutually axially mutually connected. Movement in the direction of separation is allowed. Then, by moving the needle hub 18 toward the base end side with respect to the needle tip protector 16, the second projecting piece 64 slides on the outer peripheral surface of the tubular mounting portion 20 of the needle hub 18 toward the tip end side. As a result, the second projecting piece 64 comes into contact with the second convex portion 30, and is elastically deformed outward by the inclined surface 32 which is the base end surface of the second convex portion 30. As a result, the second projecting piece 64 gets over the second convex portion 30, and after overcoming the second projecting piece 64, the second projecting piece 64 is elastically restored and deformed, and as shown in FIG. 13, the second The projecting piece 64 is located between the first convex portion 26 and the second convex portion 30 in the axial direction. In such a state, the vertical surface 65 which is the base end surface of the second projecting piece 64 and the vertical surface 31 which is the tip surface of the second convex portion 30 come into contact with each other, so that the needle tip protector 16 of the needle hub 18 comes into contact with each other. The movement to the tip side is prevented.

Further, the needle hub 18 is moved to the proximal end side with respect to the needle tip protector 16 in a state where the ridge 36 is inserted into the slit 62 of the first projecting piece 60. That is, the axial movement of the needle hub 18 with respect to the needle tip protector 16 is guided by the slit 62 and the ridge 36. Then, in the protected state of the needle tip 12 shown in FIG. 14, the tip surfaces (vertical surfaces 61a, 61a) of the divided bodies 60a, 60a on both sides of the slit 62 are vertical surfaces which are the base end surfaces of the first convex portion 26. The needle hub 18 is prevented from moving toward the proximal end side with respect to the needle tip protector 16 by abutting on 29 (contact surface 37 which is a portion other than the formation position of the ridge 36).

As a result, the needle hub 18 can be prevented from moving to both sides in the axial direction with respect to the needle tip protector 16. In such a state, the needle tip 12 of the indwelling needle 14 is located in the needle tip protector 16, the protected state of the needle tip 12 is maintained, and the indwelling needle assembly 10 after use can be safely discarded. ..

Hereinafter, a method of assembling the needle tip protector 16 and the needle hub 18 will be described. The needle tip protector 16 and the needle hub 18 are assembled by inserting the needle hub 18 through the opening on the proximal end side of the enlarged portion 50 of the needle tip protector 16.

That is, in the present embodiment, the outer dimension B at the forming portion of the first convex portion 26 of the needle hub 18 is the inner dimension A and the second protrusion at the forming portion of the first projecting piece 60 of the needle tip protector 16. It is made larger than the inner dimension C at the forming portion of the piece 64, and the tip surface of the first convex portion 26 is an inclined surface (tapered surface) 28. Therefore, by inserting the needle hub 18 from the opening on the proximal end side of the enlarged portion 50 of the needle tip protector 16, the first convex portion 26 causes the first projecting piece 60 and the second projecting piece 64 to be on the outer peripheral side. It is elastically deformed so that it can be pushed open. Then, the inner dimension A at the forming portion of the first projecting piece 60 and the inner dimension C at the forming portion of the second projecting piece 64 exceed the outer dimension B at the forming portion of the first convex portion 26. The tip portion (cylindrical mounting portion 20) of the needle hub 18 can be inserted from the opening on the base end side of the enlarged portion 50 of the needle tip protector 16.

Therefore, in the present embodiment, in the needle tip protector 16, the internal dimensions A and C at the forming sites of the flexible pieces (first and second projecting pieces 60 and 64) are the first convex portions on the needle hub 18. A hole 74 smaller than the external dimension B at the forming site of 26 is formed by a region surrounded by the first and second projecting pieces 60 and 64, and the first and second holes 74 in the hole 74 are formed. The protrusions 60 and 64 are elastically deformed outward by the first convex portion 26, so that the first convex portion 26 gets over the first and second protrusions 60 and 64 from the proximal end side to the distal end side. Therefore, the tip portion (cylindrical mounting portion 20) of the needle hub 18 can be inserted into the hole portion 74.

In the insertion of the needle hub 18 into the needle tip protector 16, the second convex portion 30 and the second protrusion 64 are not at the same position in the circumferential direction (in other words, the protrusion 36 and the first protrusion 36). It is preferable that the slit 62 of the projecting piece 60 is not at the same position in the circumferential direction). That is, the second projecting piece 64 that has passed over the first convex portion 26 is elastically restored and deformed. In that case, if the second convex portion 30 and the second projecting piece 64 are at the same position in the circumferential direction, the second projecting piece 64 is the axis of the first convex portion 26 and the second convex portion 30. The vertical surface 31 which is the tip surface of the second convex portion 30 and the vertical surface 65 which is the base end surface of the second projecting piece 64 come into contact with each other in the state as shown in FIG. This is because the needle hub 18 cannot be further inserted in contact with the needle hub 18.

Therefore, the needle hub 18 is inserted into the needle tip protector 16 in a state where the second convex portion 30 and the second projecting piece 64 are not at the same position in the circumferential direction, for example, the second convex portion 30 and the second convex portion 30 and the second convex portion 64. This is performed in a state where the projecting piece 64 is displaced by 90 degrees around the central axis. That is, the needle hub 18 in the orientation shown in FIG. 8 is inserted into the needle tip protector 16 in the orientation shown in FIG. 10, and the needle tip protector 16 in the orientation shown in FIG. 11 is shown in FIG. The needle hub 18 in the direction to be inserted is inserted. As a result, as shown in FIG. 15, the inclined surface 28 of the first convex portion 26 elastically deforms the first and second projecting pieces 60 and 64 outward, so that the first convex portion 26 is deformed. The first and second projecting pieces 60 and 64 are overcome from the base end side to the tip end side. Note that FIG. 15 shows a state in which the first convex portion 26 is in the process of getting over the first projecting piece 60.

Then, by further inserting the needle hub 18 into the needle tip protector 16, the base end surface (vertical surface 61b) of the first projecting piece 60 and the vertical surface 31 which is the tip surface of the second convex portion 30 come into contact with each other. .. Both of these surfaces are flat surfaces that extend in the direction perpendicular to the axis, and when these two surfaces come into contact with each other, it is impossible to insert the needle hub 18 any further. The needle hub 18 in this state is shown by a chain double-dashed line in FIG.

Therefore, from this state, the needle hub 18 is rotated 90 degrees around the central axis with respect to the needle tip protector 16. That is, the second protrusion 64 and the second convex portion 30 are aligned in the circumferential direction, and the slit 62 and the protrusion 36 of the first protrusion 60 are aligned in the circumferential direction. At that time, the ridge 36 abuts on the divided bodies 60a, 60a of the first protruding piece 60 from the inside, and enters the slit 62 while elastically deforming the divided bodies 60a, 60a to the outside. After the ridge 36 has entered the slit 62, the divided bodies 60a and 60a are restored and deformed to be in the state shown in FIG.

Further, in FIG. 16, the needle hub 18 is rotated 90 degrees around the central axis with respect to the needle tip protector 16 from the state where the first projecting piece 60 and the second convex portion 30 are in contact with each other. A state in which the convex portion 30 of 2 and the second projecting piece 64 are aligned in the circumferential direction is shown. When the second convex portion 30 comes into contact with the first projecting piece 60, the second convex portion 30 is located on the tip side of the base end of the second projecting piece 64, and the needle tip protector 16 By rotating the needle hub 18 about 90 degrees around the central axis, the second convex portion 30 abuts on the second projecting piece 64 from the inside, and the second projecting piece 64 is elastically deformed to the outside. It has become like. In this way, the second projecting piece 64 is elastically deformed outward by the second convex portion 30, so that the second convex portion 30 gets over the second projecting piece 64 from the base end side to the tip end side. The tip portion (cylindrical mounting portion 20) of the needle hub 18 can be further inserted into the hole portion 74. When the second convex portion 30 passes over the second projecting piece 64, the second projecting piece 64 is elastically restored and deformed.

As a result, the needle hub 18 in the orientation shown in FIG. 7 is inserted into the needle tip protector 16 in the orientation shown in FIG. 10, and the needle tip protector 16 in the orientation shown in FIG. 11 is shown in FIG. The needle hub 18 in the indicated orientation is inserted. As a result, the needle hub 18 can be inserted into the needle tip protector 16 and is inserted to the state shown in FIGS. 1 to 4. Then, by engaging the hook 42 of the needle hub 18 with the connecting portion 58 of the needle tip protector 16, the needle tip 12 of the indwelling needle 14 protrudes from the needle tip protector 16 as shown in FIGS. The state can be maintained.

However, the needle hub 18 may be inserted into the needle tip protector 16 in a state where the second projecting piece 64 and the second convex portion 30 are aligned in the circumferential direction. That is, by inserting the needle hub 18 into the needle tip protector 16 in a state where the second projecting piece 64 and the second convex portion 30 are aligned in the circumferential direction, the second projecting piece is as described above. The 64 and the second convex portion 30 come into contact with each other, and further insertion becomes impossible. At the time when these come into contact with each other, the needle hub 18 is rotated 90 degrees with respect to the needle tip protector 16, and the second The position of the projecting piece 64 and the second convex portion 30 in the circumferential direction may be shifted, and then the needle hub 18 may be inserted into the needle tip protector 16 by the method described above.

Alternatively, the needle hub 18 is inserted into the needle tip protector 16 in a state where the second convex portion 30 and the second projecting piece 64 are displaced by 90 degrees around the central axis as described above, and the first After the projecting piece 60 and the second convex portion 30 are brought into contact with each other, the needle hub 18 is strongly pushed against the needle tip protector 16 to forcibly elastically deform the first projecting piece 60 outward. Then, the second convex portion 30 may get over the first projecting piece 60 from the proximal end side to the distal end side. Then, after the second convex portion 30 gets over the first projecting piece 60, the needle hub 18 is rotated 90 degrees around the central axis with respect to the needle tip protector 16, so that the projecting portion 36 is inserted into the slit 62. At the same time as entering, the second convex portion 30 and the second projecting piece 64 can be aligned in the circumferential direction.

The relative rotation of the needle hub 18 and the needle tip protector 16 around the central axis as described above is the base of the needle hub 18 (pipeline connecting portion 24 including the engaging arm 38) and the needle tip protector 16. Since the outer shape of the end portion (enlarged portion 50) is a horizontally long shape, this can be easily performed. That is, at the start of inserting the needle hub 18 into the needle tip protector 16, the longitudinal direction of the conduit connecting portion 24 and the longitudinal direction of the enlarged portion 50 are set to be orthogonal to each other, and the needle tip protector 16 has On the other hand, by rotating the needle hub 18 around the central axis, the longitudinal direction of the pipeline connecting portion 24 and the longitudinal direction of the expanding portion 50 become the same direction. While confirming the direction, the needle tip protector 16 and the needle hub 18 can be rotated around the central axis.

In the indwelling needle assembly 10 of the present embodiment having the above structure, even if the needle tip protector 16 and the needle hub 18 are forcibly rotated relative to each other with a large torque, the needle tip protector 16 from the needle hub 18 Is prevented from falling off. That is, the needle hub 18 is moved toward the proximal end side of the needle tip protector 16 from the initial state shown in FIGS. 1 to 4 to the protected state shown in FIGS. 12 to 14, and the needle hub is moved with respect to the needle tip protector 16. Even if 18 is rotated 90 degrees around the central axis, since the first convex portion 26 is formed over the entire circumference in the circumferential direction, the vertical surface 29 which is the base end surface of the first convex portion 26. And the tip surface (vertical surface 61a) of the first projecting piece 60 come into contact with each other, and further movement of the needle hub 18 to the proximal end side can be prevented.

Further, in the present embodiment, since the tip surface of the first convex portion 26 is an inclined surface (tapered surface) 28, the first convex portion 26 is the first and second projecting pieces 60, The 64 can be elastically deformed so as to be pushed outward, and the needle hub 18 can be inserted into the hole 74 of the needle tip protector 16.

Further, in the present embodiment, the needle tip protector is caused by the contact between the first convex portion 26 and the first projecting piece 60 and the contact between the second convex portion 30 and the second projecting piece 64. The movement of the needle hub 18 to both sides in the axial direction with respect to 16 can be prevented. In particular, in the present embodiment, the first projecting pieces 60 are provided in pairs facing each other in the radial direction, and the second projecting pieces 64 are also provided in pairs facing each other in the radial direction. The effect of restricting the movement of the needle hub 18 with respect to the needle tip protector 16 can be stably exhibited.

Furthermore, in the present embodiment, the needle hub 18 is integrally molded, and the tubular mounting portion 20 and the pipeline connecting portion 24 are integrally formed, so that the number of parts and the cost can be reduced. obtain.

Although the embodiments of the present invention have been described above, the present invention is not limitedly interpreted by the specific description in the embodiments, and various changes, modifications, improvements, etc. are made based on the knowledge of those skilled in the art. It can be carried out in the form of adding.

For example, in the above embodiment, both the base end portion of the needle hub 18 (pipeline connecting portion 24 including the engaging arm 38) and the base end portion of the needle tip protector 16 (enlarged portion 50) have a horizontally long outer shape. However, the present invention is not limited to this mode, and the outer shape of the base end portion of the needle hub and the base end portion of the needle tip protector may be a perfect circle, an oval, a square, a rectangle, or the like. .. That is, for example, the engaging arm may protrude toward the tip side from the outer peripheral edges of the left and right ends of the pipeline connecting portion having a substantially perfect circular shape, and the enlarged portion has the vertical dimension and the horizontal dimension. By making them substantially equal, they may be formed into a substantially perfect circular shape.

Further, in the above embodiment, the upper side wall portion 54 and the lower side wall portion 56 of the enlarged portion 50 are integrally molded on both upper and lower sides of the tubular portion 48, and the upper and lower wall portions 54 and 56 are connected by the connecting portion 58. As a result, the enlarged portion 50 was formed, but the base end portion of the tubular mounting portion may be expanded in a substantially elliptical shape to form an enlarged portion, that is, the enlarged portion may be formed on the entire circumference in the circumferential direction. It may have a continuous peripheral wall over. Further, in the above-described embodiment, both sides of the base end portion of the tubular mounting portion 20 project as the second projecting pieces 64 inside the enlarged portion 50, but the enlarged portions are all in the circumferential direction as described above. When the peripheral wall is continuous over the circumference, the second projecting piece may project from the inner peripheral surface of the enlarged portion toward the proximal end side. At that time, the openings provided on the left and right sides of the enlarged portion may be formed so as to penetrate the peripheral wall of the enlarged portion in the plate thickness direction.

Furthermore, in the above-described embodiment, the tip surface of the first convex portion 26 is an inclined surface (tapered surface) 28, and the first and second protrusions 60 and 64 are brought into contact with the first and second projecting pieces 60 and 64. The projecting pieces 60 and 64 were elastically deformed to the outside. For example, the tip end surface of the first convex portion was set as a vertical surface extending in the direction perpendicular to the axis, and the base end surfaces of the first and second projecting pieces were set to the base end. An inclined surface that inclines outward in the opposite direction toward the side may be used, or both the tip surface of the first convex portion and the base end surface of the first and / or second projecting piece may be used as the inclined surface. .. As a result, when the needle hub is inserted into the needle tip protector, the first convex portion and the base end surfaces of the first and second projecting pieces come into contact with each other, so that the first and second projecting pieces move outward. Can be elastically deformed. However, by adopting the above aspect, the contact between the second projecting piece and the second convex portion is easily released when the needle tip is protected, but the movement of the needle hub to the tip side with respect to the needle tip protector is prevented. A mechanism may be adopted separately.

Further, in the above embodiment, the first convex portion 26 is provided over the entire circumference in the circumferential direction, but for example, the needle hub 18 and the needle tip protector 16 are 90 around the central axis as in the above embodiment. When assembling by rotating the degree, the first convex portion may be provided only at four positions on the outer peripheral surface of the needle hub, in the upper, lower, left and right directions. The needle hub and the needle tip protector need to be rotated relative to each other around the central axis so that the second convex portion and the second projecting piece are temporarily at different positions in the circumferential direction. The rotation angle around the axis is not limited to 90 degrees. However, as will be described later, the second convex portion and the second projecting piece are not indispensable, and when assembling the needle hub and the needle tip protector, the needle hub and the needle tip protector do not necessarily rotate relative to each other. You may.

Further, in the above embodiment, the flexible piece is composed of a pair of first projecting pieces 60, 60 and a pair of second projecting pieces 64, 64, but the flexible piece is a pair of first projecting pieces. It may be composed of at least one of a projecting piece and a pair of second projecting pieces. For example, when only the first projecting piece is adopted, the second convex portion and the second projecting piece are not indispensable, and a mechanism for restricting the movement of the needle hub to the tip side with respect to the needle tip protector is separately provided. It may be adopted. Similarly, when only the second projecting piece is adopted, the first convex portion and the first projecting piece are not essential, and a mechanism for restricting the movement of the needle hub toward the proximal end side with respect to the needle tip protector. May be adopted separately. In that case, by making the tip surface of the second convex portion and / or the base end surface of the second projecting piece an inclined surface, when the needle hub is inserted into the needle tip protector, the second convex portion causes a second. The projectile may be elastically deformed outward.

Furthermore, in the above-described embodiment, the circumferential width dimension W _{1 of the slit 62 is smaller than the circumferential width dimension W 2 of} the second convex portion 30, which is shown in FIGS. 17 (a) and 17 (b). as the needle assembly 78 of another embodiment of the present invention, the circumferential width W ₁ of the slit 80 ', the circumferential width W ₂ of the second protrusions 82' may be greater than. As a result, when the needle hub 84 and the needle tip protector 86 are assembled according to the procedure described in the embodiment, the first projecting piece 88 and the second convex portion 82 do not come into contact with each other, and the second convex portion 82 is not brought into contact with each other. The portion 82 moves from the proximal end side to the distal end side of the first projecting piece 88 through the slit 80 provided in the first projecting piece 88, and the first projecting piece 88 is not accompanied by elastic deformation. Can get over the projectile 88. Then, after the needle hub 84 is sufficiently inserted into the needle tip protector 86, the needle tip protector 86 and the needle hub 84 are rotated 90 degrees around the central axis, so that the ridge 36 is inserted into the slit 80 and at the same time. , The second convex portion 82 and the second projecting piece 64 are aligned in the circumferential direction. As in the present embodiment, after the second convex portion 82 has passed through the first projecting piece 88, the needle tip protector 86 and the needle hub 84 are relatively rotated to the outside of the second projecting piece 64. The second convex portion 82 is not accompanied by elastic deformation to the outside of the first and second projecting pieces 88, 64, and the first and second projecting pieces 88, It is possible to get over 64 smoothly. Therefore, in this embodiment, the convex portion that is allowed to be overcome by the elastic deformation of the flexible piece to the outside is composed of only the first convex portion 26, and the flexible piece is limited to the first projecting piece 88 only. It is also possible to configure by. However, 'is circumferential width dimension W ₂ of the second protrusions 82' circumferential width dimension W ₁ of the slit 80 as in this embodiment, even when adopting a larger configuration than the second convex portion 82 By relatively rotating the needle tip protector 86 and the needle hub 84 while passing through the first projecting piece 88, the second projecting piece 64 is elastically elasticized outward by the second convex portion 82 as in the above embodiment. It is also possible to deform it, and in such a case, a convex portion that is allowed to be overcome by elastic deformation to the outside of the flexible piece is composed of a first convex portion 26 and a second convex portion 82. At the same time, the flexible piece is composed of the first projecting piece 88 and the second projecting piece 64.

In the above embodiment, the circumferential width W ₃ of the ridges 36, which had been smaller than the circumferential dimension W ₄ of the split body 60a, yet another aspect of the present invention shown in FIGS. 18 and 19 like in the needle assembly 89, the circumferential width W ₃ of the rib 90 'is (in this embodiment transverse dimension) circumferential dimension of the split body 92 W _4' may be greater than. As a result, the circumferential dimension of the split body 92 is shortened to prevent elastic deformation, and even if a large torque is applied to the needle hub 18, for example, rotation around the central axis with respect to the needle tip protector 16 is prevented. Therefore, the needle tip protector 16 from the needle hub 18 can be more reliably prevented from falling off.

Further, in the above-described embodiment, the internal dimension A at the forming portion of the first projecting piece 60 of the needle tip protector 16 and the internal dimension C at the forming portion of the second projecting piece 64 of the needle tip protector 16 are the needle hub. Although it was made smaller than the external dimension B at the forming portion of the first convex portion 26 and / or the second convex portion 30 of 18, these internal dimensions A and C may be equal to the external dimension B. That is, even when the internal dimensions A and C are equal to the external dimensions B, the needle hub is tilted even slightly with respect to the central axis when the needle hub is pulled out from the needle tip protector, so that the convex portion (for example, the first convex portion) is formed. Since the 26) is locked to the flexible piece (for example, the first projecting piece 60), the needle tip protector can be substantially prevented from falling off from the needle hub.

Furthermore, in the needle hub 18 of the above embodiment, the tubular mounting portion 20 and the pipeline connecting portion 24 are integrally molded, but they may be formed separately and post-fixed.

10 Indwelling needle assembly (needle assembly)
12 Needle tip 14 Indwelling needle (puncture needle)
16 Needle tip protector 18 Needle hub 20 Cylindrical mounting portion 22 External pipeline 24 Pipeline connection portion 24a Insertion recess 24b Connection cylinder portion 26 First convex portion (convex portion, annular convex portion)
28 Inclined surface 29 Vertical surface 30 Second convex part (convex part)
31 Vertical surface 32 Inclined surface 34 Tapered surface 36 Protrusion 37 Contact surface 38 Engaging arm 40 Gap 42 Hook 44 Peripheral wall 46 Inner hole 48 Cylindrical part 50 Enlarged part 52 Opening part 54 Upper side wall part 56 Lower side wall part 58 Connecting part 60 First projecting piece (flexible piece)
60a Split body 61a, 61b Vertical surface 62 Slit 64 Second projecting piece (flexible piece)
65 Vertical surface 66 Wing-shaped part 68 Connecting part 70 Wing body 72 Fitting cylinder part 74 Hole part 78 Needle assembly 80 Slit 82 Second convex part 84 Needle hub 86 Needle tip protector 88 First projecting piece (flexible piece)
89 needle assembly 90 ridge 92 split

Claims (8)

With a puncture needle,
A needle hub that supports the base end of the puncture needle and
A convex portion provided on the outer peripheral surface of the needle hub and
A needle assembly provided with a needle tip protector that covers the needle tip of the puncture needle by moving in the needle axis direction with respect to the puncture needle.
The needle tip protector is
A flexible piece that restricts the movement of the needle tip protector in the needle axis direction by contact with the convex portion.
The tip of the needle hub can be inserted, and the flexible piece has a hole whose internal dimension at the forming portion is equal to or less than the external dimension at the forming portion of the convex portion of the needle hub.
A needle assembly in which overcoming of the convex portion from the proximal end side to the distal end side of the flexible piece can be allowed by elastic deformation to the outside of the flexible piece. The needle assembly according to claim 1, wherein the tip surface of the convex portion in the needle axis direction includes an inclined surface whose protruding dimension from the outer peripheral surface of the needle hub gradually decreases toward the tip side. The needle assembly according to claim 1 or 2, wherein the convex portion includes an annular convex portion provided on the outer peripheral surface of the needle hub over the entire circumference in the circumferential direction. At least one of a pair of first projecting pieces facing each other in the radial direction and a pair of second projecting pieces facing each other in a direction orthogonal to the facing direction of the pair of first projecting pieces. The needle assembly according to any one of claims 1 to 3, which is configured to include the needle assembly. The needle hub is any one of claims 1 to 4, wherein a pipeline connecting portion connected to an external pipeline is integrally formed on the base end side of the tubular mounting portion to which the puncture needle is mounted at the tip end portion. The needle assembly according to item 1. The convex portion is formed by at least one of a first convex portion and a second convex portion that restricts the movement of the needle tip protector in the needle axis direction, and the convex portion is formed.
The flexible piece is composed of at least one of a first projecting piece that abuts on the first convex portion and a second projecting piece that abuts on the second convex portion.
The first projecting piece has a slit extending straight over the entire length in the needle axis direction.
Any one of claims 1 to 5, wherein the second convex portion is partially provided in the circumferential direction, and the circumferential width dimension of the slit is equal to or larger than the circumferential width dimension of the second convex portion. The needle assembly described in. The convex portion is formed by at least one of a first convex portion and a second convex portion that restricts the movement of the needle tip protector in the needle axis direction, and the convex portion is formed.
The flexible piece is composed of at least one of a first projecting piece that abuts on the first convex portion and a second projecting piece that abuts on the second convex portion.
The first projecting piece has a pair of split bodies separated from each other in the circumferential direction, and a slit extending straight over the entire length in the needle axis direction is formed between the pair of split bodies. Ori,
The needle hub has a ridge that fits into the slit.
The needle assembly according to any one of claims 1 to 6, wherein the circumferential width dimension of the ridge is equal to or greater than the circumferential width dimension of the split body. The needle assembly according to claim 6 or 7, wherein the base end surface of the first convex portion includes a plurality of contact surfaces that abut the flexible piece.

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