JP7005986B2 - Needle assembly - Google Patents

Description

The present invention relates to a needle assembly provided with a puncture needle to be punctured by a patient, and more particularly to a needle assembly provided with a needle tip protection portion for storing and protecting the needle tip of the puncture needle after use. be.

Conventionally, for example, as chemotherapy for unresectable malignant tumors, a drug solution such as an anticancer drug has been periodically and repeatedly injected into a patient's body. If an injection is given to a patient each time this drug solution is injected, the patient's skin and its surroundings may be damaged and the injection may not be possible, which is a heavy burden on the patient. Therefore, a subcutaneous implantable port is provided under the skin of the patient, the drug solution is injected into the patient's body by penetrating the septum of the subcutaneous implantable port with a puncture needle, and the drug solution is injected from the subcutaneous implantable port through a catheter into the patient's blood vessel. It is being sent in.

By the way, the post-use puncture needle removed from the septum of the subcutaneous implantable port after injecting the drug solution may have the drug solution or the patient's blood attached so as not to hurt the user or the patient. It needs to be handled safely so as not to come into contact with the user or patient.

Therefore, a needle assembly provided with a needle tip protection portion for storing and protecting the needle tip of the puncture needle removed from the septum of the subcutaneous implantable port has been proposed. Needle assemblies provided with such a needle tip protection portion have already been provided on the market, but many of them have a complicated structure, and there are few products that can be satisfied in the medical field.

The present invention has been made in the background of the above-mentioned circumstances, and by providing a needle assembly having a novel structure which has not existed in the past, it is possible to contribute to the enrichment of specific technology and products. It is the purpose.

According to the first aspect of the present invention, in a needle assembly provided with a needle tip protection portion for accommodating the needle tip of the puncture needle pulled out from the puncture state, the pulling operation force of the puncture needle is exerted on the needle tip protection portion. As a result, the needle tip protection portion itself is displaced in conjunction with the withdrawal of the puncture needle, and the wall portion of the needle tip protection portion is punctured with the displacement of the needle tip protection portion. While an introduction hole for inserting the needle tip of the needle is provided, a pair of inward protrusions protruding toward each other in the approaching direction are arranged in the introduction hole portion of the needle tip protection portion. When the puncture needle is pulled out, the puncture needle passes from the side between the abutments of the inner protrusions, and the tip of the puncture needle is guided into the needle tip protection portion. Is to be.

According to the needle assembly having a structure according to this aspect, an inward protrusion portion that protrudes in the approaching direction to each other is provided in the portion of the introduction hole of the needle tip protection portion. As a result, after the needle tip of the puncture needle is introduced into the needle tip protection portion, the needle tip of the puncture needle is caught on the inward protrusion, and the needle tip of the puncture needle protrudes again from the needle tip protection portion. Can be prevented. In particular, by providing the inward protrusion so as to incline and project in the direction in which the needle tip enters, the needle tip of the puncture needle can be smoothly guided into the needle tip protection portion along the inward protrusion. You can also.

A second aspect of the present invention is the pair of inward protrusions that project from the tips of the pair of arms that are integrally connected and face each other on the proximal end side in the needle assembly according to the first aspect. The locking member is provided with the above, and the locking member is assembled to the needle tip protection portion as a separate member from the needle tip protection portion.

According to the needle assembly having a structure according to this aspect, since the locking member is assembled as a member separate from the needle tip protection portion, the needle tip protection portion is as described in the first aspect. It can be easily realized to provide a re-protrusion prevention mechanism for the puncture needle. In addition to that, even when different characteristics are required for both the needle tip protection part and the locking member, it is possible to set different materials that can realize each characteristic in a highly compatible manner. It is also possible to obtain a more stable effect of preventing the puncture needle from re-protruding after being stored in the needle tip protection portion.

A third aspect of the present invention is that in the needle assembly according to the second aspect, the pair of arms move in an approaching direction to each other by assembling the locking member to the needle tip protection portion. It is a deformed one.

According to the needle assembly having a structure according to this aspect, by assembling the locking member to the needle tip protection portion, the pair of arms are moved and deformed in the direction of approaching each other. The distance between the abutments of the abutments can be made smaller, or when the tips of the inner abutments are in contact with each other, the abutment can be made with a stronger abutting force. This can effectively prevent the needle tip of the puncture needle from re-protruding from the needle tip protection portion.

A fourth aspect of the present invention is the needle assembly according to the third aspect, wherein the locking member has the pair of inward protrusions in a single state before being assembled to the needle tip protection portion. There is a gap between the tips of the needle tips, and the tips of the pair of inward protrusions are in contact with each other in the assembled state with the needle tip protection portion.

According to the needle assembly having a structure according to this aspect, by assembling the locking member to the needle tip protection portion, the tips of the inner protrusions are abutted against each other to be in a contact state. It is easy to deform the tip of the arm to the base end side, but it is difficult to deform the tip of the arm to the tip end side. Therefore, the needle tip of the puncture needle can be easily introduced into the needle tip protection portion, while re-protrusion from the needle tip protection portion can be prevented more reliably. In particular, before assembling the locking member to the needle tip protection portion, since there is a gap between the tips of the inward protrusions, deformation of the arm portion is easily allowed and the assembly is performed. Resistance can also be reduced.

A fifth aspect of the present invention is the needle assembly according to any one of the second to fourth aspects, wherein the peripheral wall portion that protects the needle tip of the puncture needle in the needle tip protection portion has the said. An assembly hole to which the locking member can be assembled is formed, and the locking member is fitted into the assembly hole and assembled.

According to the needle assembly having a structure according to this aspect, since an assembly hole for assembling the locking member to the needle tip protection portion is formed in the peripheral wall portion of the needle tip protection portion, for example, the needle tip protection portion is formed. It is also possible to assemble the locking member from the outside of the portion, and the assembly efficiency can be improved.

A sixth aspect of the present invention is that in the needle assembly according to any one of the first to fifth aspects, the needle hub of the puncture needle is connected to the base portion superimposed on the puncture portion by the connecting portion. The puncture needle is connected so as to be accessible and separable, and the puncture needle is separated from the base portion by pulling out the puncture needle which is punctured at the position where the needle hub is close to the base portion . The needle tip moves to the front side of the base portion, and the needle tip protection portion for accommodating the needle tip of the puncture needle is provided located on the front side of the base portion. The pair of inward protrusions are arranged with respect to the wall portion of the needle tip protection portion.

According to the needle assembly having a structure according to this aspect, for example, when the needle hub is located close to the base portion, the puncture needle protrudes from the base portion through the puncture hole provided in the base portion. The mode of being punctured is adopted. In such an embodiment, by pulling out the puncture needle, the needle tip of the puncture needle moves to the front side of the base portion and is stored in the needle tip protection portion. Can be staggered from each other, effectively preventing the puncture needle from re-projecting from the base through the puncture hole even when an external force is applied to the puncture needle after storage in the direction opposite to the pull-out direction. Can be done.

According to the needle assembly having a structure according to the present invention, the re-projection of the needle tip of the puncture needle is effectively prevented by the pair of inward protrusions provided in the needle tip protection portion.

The perspective view which shows the needle assembly as one Embodiment of this invention in the initial state. FIG. 3 is a perspective view showing a developed state of a base member including a base portion in the needle assembly shown in FIG. 1. The perspective view which shows the base member shown in FIG. 2 from another direction. It is explanatory drawing explaining the assembly operation of the locking member to the base member shown in FIG. 2 in the order of (a)-(c). It is explanatory drawing explaining the pull-out operation of the puncture needle from the needle assembly shown in FIG. 1 in the order of (a)-(c). An explanatory diagram for schematically explaining the operation of the locking member in the needle assembly shown in FIG. 1.

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, FIG. 1 shows a needle assembly 10 as an embodiment of the present invention. The needle assembly 10 includes a base member 14 having a base plate 12 as a base portion, a puncture needle 16, and a needle hub 18 for fixing and supporting the puncture needle 16. In the initial state (puncture state) shown in FIG. 1, the base plate 12 and the needle hub 18 are located close to each other, the puncture needle 16 penetrates the base plate 12 and protrudes downward, and the puncture is performed. By puncturing the needle 16 into the silicon port (septum) 20 as a puncture portion embedded in the patient's skin, a drug solution or the like can be injected into the patient's blood vessel. Then, after injecting the drug solution, the needle hub 18 is separated from the base plate 12, and the puncture needle 16 in the punctured state is pulled out upward so as to be separated from the base plate 12, so that the needle tip 22 of the puncture needle 16 is separated from the base plate 12. The needle assembly 10 is safely disposed of by being stored and protected by the needle tip protection portion 24 provided in front of the needle assembly 10.

In the following description, the front means the lower left direction in FIG. 1, which is the direction in which the puncture needle 16 extends from the needle hub 18, while the rear means an external flow path such as a syringe with respect to the needle hub 18. The upper right direction in FIG. 1, which is the connecting direction. Further, the upper side means the upper side in FIG. 1 in which the needle hub 18 is located with respect to the base plate 12, while the lower side means the direction in which the puncture needle 16 protrudes through the base plate 12. FIG. Refers to the lower part of the inside.

More specifically, the puncture needle 16 is a hollow needle formed of, for example, stainless steel or a hard synthetic resin material. The puncture needle 16 extends forward from the needle hub 18 provided at the rear and then bends downward. The tip surface 26 of the cutting edge of the puncture needle 16 is formed parallel to the puncture direction (vertical direction) in order to avoid coring when puncturing the silicon port 20.

Further, the needle hub 18 has a substantially cylindrical shape extending in the front-rear direction as a whole, and is made of a hard synthetic resin material. Then, the rear portion of the puncture needle 16 is inserted from the front opening of the needle hub 18, and a process such as adhesion is performed as necessary, so that the puncture needle 16 is fixedly supported by the needle hub 18. There is. As a result, the inner hole of the puncture needle 16 and the inner hole of the needle hub 18 are communicated with each other. A tube 28 is connected to the rear of the needle hub 18, and the inner hole of the puncture needle 16 and the inner hole of the tube 28 communicate with each other through the inner hole of the needle hub 18. Further, the lower end surface 30 of the needle hub 18 is a flat surface extending in the front-rear direction.

Further, on the outer peripheral surface of the needle hub 18, locking claws 32 protruding on both sides are provided. In the present embodiment, two locking claws 32, 32 are provided on one side of the side at a predetermined distance in the front-rear direction, and a total of four locking claws 32 are provided on both sides.

Furthermore, the lower end surface 30 of the needle hub 18 is provided with a positioning claw 34 (see FIG. 5B and the like) that projects downward. In the present embodiment, a pair of positioning claws 34, 34 are provided at a predetermined distance in the front-rear direction.

A cover member 36 made of a hard synthetic resin material is attached to the needle hub 18. As shown in FIG. 5 and the like described later, the cover member 36 has a substantially rectangular plate-shaped cover plate 38 that covers the upper part of the needle hub 18 and extends in the front-rear direction, and the cover plate 38 downward from both sides in the width direction. It is provided with a pair of side plate portions 40, 40 that extend and cover both sides of the needle hub 18. That is, these side plate portions 40, 40 face each other in the width direction of the cover plate 38. Further, these side plate portions 40, 40 are connected to each other by a connecting portion 42 extending in the width direction in front of the cover plate 38.

The cover plate 38 and the side plate portions 40, 40 form a storage groove 44 (see FIG. 5) that opens downward. The front end surfaces 46, 46 of the side plate portions 40, 40 are inclined curved surfaces whose vertical dimensions gradually decrease toward the front. Further, the rear end surfaces 48, 48 of the side plate portions 40, 40 are inclined curved surfaces whose vertical dimensions gradually decrease toward the rear.

Further, the side plate portions 40, 40 slightly project upward from the cover plate 38, and the cover plate 38 and the side plate portions 40, 40 form a mounting groove 50 that opens upward.

In each of the side plate portions 40, 40, locking holes 52, 52 penetrating in the thickness direction of the side plate portions 40, 40 are formed at positions corresponding to the locking claws 32, 32 of the needle hub 18. ing.

Further, a handle portion 56 is connected to the front end of the cover plate 38 via a thin-walled hinge portion 54. That is, the handle portion 56 is rotatable with respect to the cover plate 38 about the hinge portion 54. The handle portion 56 has a rectangular plate shape as a whole, and has a connecting plate 58 connected to the hinge portion 54 and a grip portion provided at an end portion of the connecting plate 58 opposite to the hinge portion 54. It is configured to include 60. The grip portion 60 has a larger thickness and width than the connecting plate 58, so that the grip portion 60 can be easily gripped when the puncture needle 16 described later is pulled out. The length dimension and the width dimension of the connecting plate 58 are substantially equal to the length dimension and the width dimension of the cover plate 38.

Further, in the grip portion 60, an engaging claw 62 projecting downward in the initial state is provided at the end portion on the connecting plate 58 side. In the present embodiment, a pair of engaging claws 62, 62 are provided on both sides of the grip portion 60 in the width direction, and the protruding tips thereof are formed into a hook shape, so that the claw bodies 64, 64 (see FIG. 5) are formed. It protrudes toward the hinge portion 54 side.

In the initial state, the connecting plate 58 and the cover plate 38 are overlapped with each other, and the connecting plate 58 is placed in the mounting groove 50. Further, the grip portion 60 protrudes to the rear side of the cover plate 38, and the engaging claws 62, 62 protruding from the grip portion 60 extend downward from the cover plate 38.

The needle hub 18 is inserted into the accommodating groove 44 of the cover member 36 having such a structure, and the locking claws 32 protruding from the needle hub 18 are locked in the locking holes 52 of the side plate portions 40 and 40. As a result, the needle hub 18 and the cover member 36 are assembled to each other.

Further, the base member 14 is assembled to the needle hub 18. The base member 14 is made of a hard synthetic resin material, and as shown in FIGS. On the other hand, in the initial state of the needle assembly 10, it is folded and assembled to the needle hub 18.

That is, the base member 14 has a substantially rectangular plate-shaped base plate 12 having a predetermined length dimension and width dimension at one end in the length direction (upper right in FIG. 2 and lower left in FIG. 3). ing. In the middle portion in the length direction on the upper end surface 66 (the lower surface of the base plate 12 in FIGS. 2 and 3) of the base plate 12, a pedestal portion 68 projecting upward has a predetermined length dimension in the center in the width direction. It is provided with a width dimension smaller than the width dimension of the needle hub 18. A positioning groove 70 that penetrates in the vertical direction including the base plate 12 is formed in the intermediate portion of the pedestal portion 68 in the length direction. The positioning groove 70 has a substantially rectangular shape having a length corresponding to the distance in the front-rear direction of the positioning claws 34, 34 in the needle hub 18, and projects forward and backward on the inner surface of the upper end of the positioning groove 70. A pair of positioning protrusions (not shown) are formed.

Further, in the intermediate portion in the length direction of the upper end surface 66 of the base plate 12, a pair of engaging portions 72, 72 protruding upward are provided on both sides in the width direction, that is, on both sides of the pedestal portion 68. The engaging portions 72, 72 have a substantially triangular shape in which the vertical dimension gradually decreases toward the front, and the front end surfaces 74, 74 are the rear end surfaces 48, 48 of the side plate portions 40, 40 of the cover member 36. The rear end surfaces 76 and 76 are flat surfaces that extend in the vertical direction, while the inclined curved surfaces correspond to the above. The rear end faces 76, 76 are provided with engaging grooves 78, 78 that open rearward.

In this embodiment, a pair of wing-shaped portions 80, 80 projecting outward in the width direction are provided at both end portions in the width direction at the front end portion of the base plate 12.

Here, in the central portion of the base plate 12 in the width direction, a puncture hole 82 through which the puncture needle 16 is inserted in the initial state (puncture state) is formed in front of the pedestal portion 68 in the thickness direction. ing. The puncture hole 82 is formed in a substantially circular shape or a square shape with rounded corners, and has an inner diameter dimension sufficiently larger than the outer diameter dimension of the puncture needle 16. Further, the guide hole 84 extends forward from the front end portion of the puncture hole 82, and in the initial state (that is, the state in which the base member 14 is folded), the guide hole 84 is the base plate 12. It is open to the front end. The guide hole 84 has a width dimension larger than the outer diameter dimension of the puncture needle 16 and smaller than the width dimension of the puncture hole 82, and is formed so as to penetrate in the thickness direction of the base plate 12. .. In other words, in the initial state, the puncture hole 82 is opened to the front end of the base plate 12 through the guide hole 84.

On the other hand, the base member 14 has a substantially rectangular fixing portion 86 having a predetermined length dimension and width dimension at the end portion of the other side in the length direction (lower left in FIG. 2 and upper right in FIG. 3). There is. The fixing portion 86 is configured to be located between the needle hub 18 and the cover member 36 in the vertical direction when the fixing portion 86 is folded and assembled to the needle hub 18. That is, a pair of fixing pieces 90, 90 project downward from the lower end surface 88 (lower surface in FIGS. 2 and 3) of the fixing portion 86. Further, in the state of being assembled to the needle hub 18, in the fixed portion 86, the upper right (lower left in FIG. 3) in FIG. 2 is the front side, and the lower left in FIG. 2 (upper right in FIG. 3) is the rear side. Become.

These fixed pieces 90, 90 face each other in the width direction of the base member 14, and the separation distance in the width direction is substantially equal to or slightly larger than the width dimension of the needle hub 18. Further, the length dimension (front-rear direction dimension) of these fixed pieces 90, 90 is substantially equal to or slightly smaller than the front-rear direction separation distance between the locking claws 32, 32 protruding laterally in the needle hub 18. ing.

Further, a connecting portion 94 is connected to the front end of the fixing portion 86 (upper right in FIG. 2 and lower left in FIG. 3) via a thin-walled hinge portion 92. That is, the connecting portion 94 is rotatable about the hinge portion 92 with respect to the fixed portion 86. The connecting portion 94 has a width dimension substantially equal to that of the fixed portion 86 and a predetermined length dimension, and a through groove 96 penetrating in the thickness direction is formed in the center in the width direction. The through groove 96 is formed over substantially the entire length of the connecting portion 94 in the length direction, and has a width dimension substantially equal to or slightly larger than the width dimension of the pedestal portion 68 provided on the base plate 12. There is. By providing the through groove 96, the connecting portion 94 has a pair of connecting leg portions 98, 98 on both sides of the through groove 96, and these connecting leg portions 98, 98 form the through groove 96. They face each other in the width direction.

Each of the connecting leg portions 98, 98 is provided with thin-walled hinge portions 100, 100 at two locations in the length direction, and the connecting leg portions 98, 98 are provided with the hinge portions 100, 100 in the length direction. It is divided into three parts. That is, if the first connecting portions 102, 102, the second connecting portions 104, 104, and the third connecting portions 106, 106 are used in the connecting leg portions 98, 98 in order from the side connected to the fixed portion 86, the fixed portions are fixed. The 86 and the first connecting portions 102 and 102 are connected via the hinge portion 92. Further, the first connecting portions 102, 102 and the second connecting portions 104, 104 are connected via the hinge portions 100, 100, and the second connecting portions 104, 104 and the third connecting portions 106, 106 are connected to each other. They are connected via hinge portions 100, 100. As a result, in the fixing portion 86 and the first to third connecting portions 102, 104, 106, both side portions sandwiching the hinge portions 92, 100 are relatively rotatable. In the present embodiment, in the connecting legs 98 and 98, the length dimensions of the second connecting portions 104 and 104 and the third connecting portions 106 and 106 are substantially equal.

Then, in the base member 14, the base plate 12 having the above structure and the connecting portion 94 are connected to each other via the protective bottom wall portion 108 as the wall portion. The protective bottom wall portion 108 has a substantially rectangular shape, has a width dimension substantially equal to that of the fixing portion 86 and the connecting portion 94, and has a predetermined length dimension. The protective bottom wall portion 108 is connected to the base plate 12 via the thin-walled hinge portion 110, and the connecting leg portions 98, 98 in the connecting portion 94 via the thin-walled hinge portions 112, 112 ( It is connected to the third connecting portion 106, 106). As a result, the protective bottom wall portion 108 can be rotated around the hinge portion 110 with respect to the base plate 12, and the hinge portion with respect to the connecting leg portions 98, 98 (third connecting portions 106, 106). It is rotatable around 112 and 112.

In the initial folded state, the protective bottom wall portion 108 is folded back about the hinge portion 110 with respect to the base plate 12 from the unfolded state shown in FIGS. 2 and 3. That is, in the initial state, the lower end surface 114 (lower surface in FIGS. 2 and 3) of the protective bottom wall portion 108 is overlapped with the upper end surface 66 of the base plate 12. Further, in the initial state, in the protective bottom wall portion 108, the lower left (upper right in FIG. 3) in FIG. 2 is the rear side, and the upper right in FIG. 2 (lower left in FIG. 3) is the front side.

Further, a vertical wall portion 116 projecting in a direction orthogonal to the protective bottom wall portion 108 is provided at the end portion (rear end portion in the initial folded state) of the protective bottom wall portion 108 on the connecting portion 94 side. ing. The vertical wall portion 116 has a substantially rectangular plate shape having a width dimension substantially equal to that of the protective bottom wall portion 108 and a predetermined protrusion dimension. Then, in the initial state of being folded around the hinge portion 110, the vertical wall portion 116 stands up from the base plate 12 and is arranged. Further, in the center of the vertical wall portion 116 in the width direction, an insertion groove 118 extending downward from the upper end is formed in the initial state. The width dimension of the insertion groove 118 is larger than the outer diameter dimension of the puncture needle 16.

Here, in the center of the protective bottom wall portion 108 in the width direction, an introduction hole 120 extending from the end portion on the side connected to the connecting portion 94 to the end portion on the side connected to the base plate 12 (FIG. 5 (c) described later). ) Is formed. The introduction hole 120 penetrates the protective bottom wall portion 108 in the thickness direction, that is, the introduction hole 120 opens to the lower end surface 114 of the protective bottom wall portion 108. Then, while the end portion of the introduction hole 120 on the connecting portion 94 side (that is, the rear end portion in the initial state) is closed by the protective bottom wall portion 108, the end portion on the base plate 12 side (that is, the front end in the initial state) is closed. Part) is open to the outside.

The introduction hole 120 provided in the protective bottom wall portion 108 and the guide hole 84 provided in the base plate 12 are formed at positions corresponding to each other in the width direction of the base member 14, and the base member 14 is in a deployed state. , Communicate with each other. In other words, the protective bottom wall portion 108 is folded back with respect to the base plate 12 at the hinge portion 110, so that each of the introduction hole 120 and the guide hole 84 is opened to the outside at the front end portion. That is, in the base plate 12, the protective bottom wall portion 108 is hinged and connected by the hinge portion 110 at the front end portion in front of the puncture hole 82.

In the introduction hole 120, the width dimension on the connecting portion 94 side is sufficiently larger than the outer diameter dimension of the puncture needle 16, while the width dimension on the base plate 12 side is smaller than the width dimension on the connecting portion 94 side. Therefore, it is substantially equal to the width dimension of the guide hole 84. That is, when the base member 14 is folded and assembled with the puncture needle 16, the puncture needle 16 is inserted through the portion of the introduction hole 120 having a large width dimension, so that the inner surface of the introduction hole 120 and the puncture needle 16 are inserted. Contact with the needle tip 22 can be effectively avoided, and the possibility that the needle tip 22 of the puncture needle 16 is crushed can be reduced. In particular, in the present embodiment, when the base member 14 is folded, the puncture hole 82 and the portion of the introduction hole 120 having a large width dimension overlap each other in the vertical direction, and these puncture holes are arranged. The base member 14 and the puncture needle 16 can be assembled by inserting the puncture needle 16 through the 82 and the portion of the introduction hole 120 where the width dimension is increased. Thereby, damage to the puncture needle 16 at the time of assembling the base member 14 and the puncture needle 16 can be prevented more effectively.

Further, side wall portions 122, 122 projecting upward in the initial state are integrally provided at both ends of the protective bottom wall portion 108 in the width direction, and the rear side of the side wall portions 122, 122 (connecting portion 94 side). ) Is integrally continuous with the vertical wall portion 116. Then, these side wall portions 122 and 122 are closed by the integrally formed front wall portion 124 from the front to the upper side (the base plate 12 side in the developed view of the base member 14 shown in FIGS. 2 and 3). That is, the needle tip protection portion 24 including the protective bottom wall portion 108, the vertical wall portion 116, the side wall portions 122, 122, and the front wall portion 124, accommodates and protects the needle tip 22 of the puncture needle 16 at the time of extraction. It is configured. In other words, the peripheral wall portion 125 of the needle tip protection portion 24 is configured to include the protective bottom wall portion 108, the vertical wall portion 116, the side wall portions 122, 122, and the front wall portion 124, and the needle tip protection portion 24 is provided. One of the constituent wall portions is a protective bottom wall portion 108. The side wall portions 122 and 122 have a substantially triangular shape in which the vertical dimension gradually decreases toward the front in the initial state, and the front end surface 126 of the front wall portion 124 is the side plate portions 40 and 40 of the cover member 36. It is an inclined curved surface that substantially corresponds to the front end surfaces 46, 46 of the above.

Here, the front wall portion 124 is formed with an assembly hole 128 (see FIG. 4 described later) that penetrates in the vertical direction in the initial state. The assembly hole 128 is formed in the front-rear intermediate portion of the front wall portion 124, has a predetermined front-rear direction dimension, and has a width dimension substantially equal to the distance between the facing surfaces of the side wall portions 122, 122. The inner surfaces 130 and 130 (see FIG. 4) of the side wall portions 122 and 122 and the inner surface of the assembly hole 128 are continuous with each other. Further, the width dimension of the upper opening of the assembly hole 128 is larger than that of the lower opening, and the upper opening of the assembly hole 128 is formed so as to straddle the side wall portions 122 and 122 on both sides in the width direction. Has been done. As a result, the front end surface 126 of the front wall portion 124 is formed with a fitting groove 132 that opens upward at the position where the assembly hole 128 is formed.

Further, the inner surfaces 130 and 130 of the side wall portions 122 and 122 below the assembly hole 128 are provided with locking protrusions 134 and 134 (see FIG. 4) protruding inward. These locking protrusions 134, 134 are formed in the vertical intermediate portion of the side wall portions 122, 122, and have a substantially triangular or substantially trapezoidal vertical cross section. That is, the upper end surfaces of these locking protrusions 134 and 134 are inclined surfaces 136 and 136 in which the protrusion dimension from the inner surfaces 130 and 130 increases as the downward direction is lowered, while the lower end surfaces of the locking protrusions 134 and 134 are below. The end face is a flat surface 138,138 extending in a direction orthogonal to the vertical direction.

In the initial state, the base member 14 having the above structure is folded and assembled to the needle hub 18.

That is, as shown in FIG. 5A described later, the fixing portion 86 of the base member 14 is located in the accommodating groove 44 between the cover plate 38 and the needle hub 18 of the cover member 36 in the vertical direction. The fixing pieces 90, 90 protruding from the fixing portion 86 are inserted between the front and rear directions of the locking claws 32, 32 provided on the needle hub 18.

Further, the first connecting portions 102, 102 connected to the fixing portion 86 via the hinge portion 92 extend substantially in the vertical direction in front of the needle hub 18, and are connected to the first connecting portions 102, 102. 2 The connecting portions 104 and 104 are bent at the hinge portions 100 and 100 and extend rearward. Further, the third connecting portions 106, 106 connected to the second connecting portions 104, 104 are folded back by the hinge portions 100, 100 and extend forward. The third connecting portions 106, 106 are overlapped with the upper end surface 66 of the base plate 12.

The second connecting portions 104, 104 and the third connecting portions 106, 106 are housed between the pedestal portion 68 and the engaging portions 72, 72 on both sides of the pedestal portion 68, that is, the connecting portions. The pedestal portion 68 is inserted into the through groove 96 provided at the center in the width direction of the 94. Further, the positioning claws 34, 34 protruding downward from the needle hub 18 are inserted into the positioning groove 70 provided in the pedestal portion 68, and the lower end surface 30 of the needle hub 18 is overlapped with the pedestal portion 68 to form a needle. The hub 18 is mounted on the pedestal portion 68.

Further, the protective bottom wall portion 108 connected to the third connecting portion 106, 106 extends forward as it is from the third connecting portion 106, 106, and the lower end surface 114 of the protective bottom wall portion 108 is the protective bottom wall. It is overlapped with the upper end surface 66 of the base plate 12 folded back by the hinge portion 110 in front of the portion 108. In other words, at the hinge portion 110 provided at the front end portion of the base plate 12, the protective bottom wall portion 108 is folded back with respect to the base plate 12, and the protective bottom wall portion 108 (needle tip protection portion) is located on the front side of the base plate 12. 24) is provided. Here, the vertical wall portion 116 projecting upward from the protective bottom wall portion 108 is located in front of the first connecting portions 102, 102, and the needle tip protection portion 24 including the vertical wall portion 116 and the like is configured. Is located in the accommodating groove 44 of the cover member 36.

Furthermore, the protective bottom wall portion 108 and the base plate 12 are overlapped in the vertical direction so that the introduction hole 120, the puncture hole 82, and the guide hole 84 are overlapped in the vertical direction. Then, the puncture needle 16 extending forward from the needle hub 18 is inserted into the insertion groove 118 provided in the vertical wall portion 116, and is bent downward to the portion of the introduction hole 120 having a large width dimension and the puncture. It projects below the base plate 12 through the hole 82. In the present embodiment, the puncture needle 16 does not abut on the inner surface of either the introduction hole 120 or the puncture hole 82, and the portion of the introduction hole 120 having a large width dimension and the puncture hole 82 are abbreviated. It is inserted in the center.

On the other hand, the rear end surfaces 48, 48 of the side plate portions 40, 40 of the cover member 36 are overlapped with the front end surfaces 74, 74 of the engaging portions 72, 72 protruding upward from the base plate 12. Further, in the handle portion 56 provided on the cover member 36, the connecting plate 58 is overlapped with the cover plate 38 and placed in the mounting groove 50 provided above the cover plate 38. Then, the claw bodies 64, 64 of the engaging claws 62, 62 extending downward from the grip portion 60 are inserted into the engaging grooves 78, 78 provided in the engaging portions 72, 72 of the base plate 12 and locked. ing.

In the initial state, the base member 14 is assembled to the needle hub 18 with such a folding structure, and by folding the connecting portion 94 and the protective bottom wall portion 108, the base plate 12 and the needle hub 18 are in close contact with each other. It is said that. When the base plate 12 and the needle hub 18 are in close proximity to each other, the puncture needle 16 protrudes from the base plate 12 so that the puncture needle 16 can be punctured by the patient (puncture state). Before puncturing the puncture needle 16, for example, the needle tip 22 of the puncture needle 16 may be covered with a resin tube or the like to prevent damage to the needle tip 22 or erroneous puncture.

Here, the needle tip protection portion 24 of the present embodiment is assembled with a locking member 140 made of a hard synthetic resin material, which is a separate member, from above through the assembly hole 128 of the front wall portion 124. .. As shown in FIG. 4, the locking member 140 includes a pair of arm portions 142 and 142 facing each other in the width direction of the needle tip protection portion 24. The arms 142 and 142 extend from above to below in the initial state, respectively, and are connected to each other by a connecting portion 144 extending in the width direction at the upper end portion thereof. In other words, a pair of arm portions 142 and 142 facing each other in the width direction project downward from the connecting portion 144 and are integrally formed, and on the projecting base end side thereof, the connecting portion 144 integrally forms with each other. It is connected. As a result, the arms 142 and 142 can be elastically deformed in the opposite directions, especially at the protruding tip portion thereof. The pair of arm portions 142 and 142 are inclined in a direction of gradually expanding toward the protruding tip side (downward).

The protruding tips of the arms 142 and 142 are formed with inward protrusions 146 and 146 that project inward in the opposite direction, which is a direction in which they approach each other. These inward protrusions 146 and 146 are inclined in the direction toward the protruding base end side (upward) of the arm portions 142 and 142 as they become inward in the facing direction. That is, the distance between the inward protrusions 146 and 146 facing each other is gradually reduced from the protrusion base end of the inner protrusions 146 and 146 toward the protrusion tip. In the present embodiment, as shown in FIG. 4A, in the single state of the locking member 140 before being assembled to the needle tip protection portion 24, between the protruding tips of the inward protrusions 146 and 146, A gap 148 of a predetermined size is formed.

Further, locking grooves 150, 150 that open outward are formed on the outer surfaces of the arms 142, 142 in the opposite direction. That is, on the outer surfaces of the arms 142 and 142 in the opposite direction, the contact projections 152 and 152 projecting outward are formed above the locking grooves 150 and 150, that is, at the protruding base ends of the arms 142 and 142. At the same time, pressing protrusions 154 and 154 are formed below the locking grooves 150 and 150, that is, at the protruding tip portions of the arm portions 142 and 142.

It should be noted that these arm portions 142 and 142 extend above the connecting portion 144 and are connected to each other by the top plate portion 156 above the connecting portion 144. The top plate portion 156 extends in the width direction of the needle tip protection portion 24, and has a curved plate shape substantially corresponding to the front wall portion 124 of the needle tip protection portion 24. The top plate portion 156 extends outward in the width direction from the arm portions 142 and 142, and when the locking member 140 is assembled to the needle tip protection portion 24, the top plate portion 156 is attached to the front end surface 126 of the front wall portion 124. It is designed to be fitted in the provided fitting groove 132.

In the locking member 140 having such a structure, the maximum width direction dimension (maximum width dimension of the protruding tip portion) of the opposing arm portions 142 and 142 in the single state before being assembled to the needle tip protection portion 24 is the needle tip. It is made larger than the distance between the facing surfaces of the inner surfaces 130 and 130 of the side wall portions 122 and 122 in the protective portion 24. Further, the maximum width dimension between the contact protrusions 152 and 152 located at the protruding base ends of the arm portions 142 and 142 is substantially the same as or slightly larger than the distance between the facing surfaces of the inner surfaces 130 and 130 of the side wall portions 122 and 122. Has been done.

When assembling the locking member 140 to the needle tip protection portion 24, the locking member 140 is moved downward from the state where the locking member 140 is positioned above the assembly hole 128 as shown in FIG. 4A. Push it in. As a result, as shown in FIG. 4B, the arm portions 142, 142 of the locking member 140 are guided by the inner surfaces 130, 130 of the side wall portions 122, 122, and the specially protruding tips of the arm portions 142, 142 are guided. The portions are elastically deformed by moving inward in the opposite direction along the inclined surfaces 136 and 136 of the locking protrusions 134 and 134, that is, in the directions of approaching each other.

Then, by pushing the locking member 140 further downward, as shown in FIG. 4C, the locking protrusions 134, in the locking grooves 150, 150 provided on the outer surfaces of the arm portions 142, 142, The 134 is fitted and locked, and the protruding tips of the arms 142 and 142 are elastically restored and deformed. As a result, the locking member 140 is fitted into the assembly hole 128 of the needle tip protection portion 24 and assembled, and in such an assembled state, the arm portions 142 and 142 are fitted with the needle tip protection portion 24. The inside extends downward, and the protruding tip thereof is substantially at the same position as the lower end surface 114 of the protective bottom wall portion 108. That is, the inward protrusions 146 and 146 extending from the protruding tips of the arm portions 142 and 142 are provided in the portion of the introduction hole 120 in the protective bottom wall portion 108 of the needle tip protection portion 24, and specifically, the introduction portion is provided. It is provided so as to extend upward from the lower opening of the hole 120.

Here, in the state of assembling the locking member 140 to the needle tip protection portion 24 as shown in FIG. 4 (c), the protruding tip portions of the arm portions 142 and 142 are not restored to the position of the stand-alone state, but the side wall. The inner surfaces 130 and 130 below the locking protrusions 134 and 134 in the portions 122 and 122 are pressed inward in the facing direction. In other words, the pressing protrusions 154 and 154 provided below the locking grooves 150 and 150 in the arms 142 and 142 have the side walls 122 and 122 based on the elastic restoring force of the arms 142 and 142. The arms 142 and 142 of the locking member 140 are held in a state of being closer to each other than in a single state. As a result, the protruding tips of the inward protrusions 146 and 146 extending from the arms 142 and 142 are in contact with each other, and are formed between the protruding tips of the inward protrusions 146 and 146. The gap 148 is designed to disappear. Further, in such an assembled state, the contact protrusions 152, 152 provided at the protruding base ends of the arm portions 142, 142 are inner surfaces 130 above the locking protrusions 134, 134 in the side wall portions 122, 122. It is in contact with 130 with zero touch or slightly pressed.

In this embodiment, by assembling the locking member 140 to the needle tip protection portion 24, the locking member 140 is provided in the fitting groove 132 provided on the front end surface 126 of the front wall portion 124 of the needle tip protection portion 24. The top plate portion 156 of the above is fitted so that the front end surface 126 of the needle tip protection portion 24 becomes a substantially smooth inclined curved surface.

In the needle assembly 10 having the above structure, the base plate 12 is superposed on the patient's skin, and the puncture needle 16 is punctured into the silicon port 20 embedded in the patient's skin. In other words, the puncture needle 16 is punctured with the base plate 12 as the base portion superposed on the silicon port 20 as the puncture portion via the skin. As a result, the puncture needle 16 penetrates the silicon port 20, the inner hole of the puncture needle 16 and the blood vessel of the patient are communicated with each other, and an internal chemical solution such as a syringe (not shown) connected to the tube 28 behind the needle hub 18. Etc. are injected into the patient's blood vessels.

Then, after injecting a chemical solution or the like into the blood vessel, as shown in FIG. 5A, the grip portion 60 of the cover member 36 is picked up and pushed upward to push up the gripping portion 60, so that the claw bodies 64 of the engaging claws 62 and 62 are 64. , 64 and the engaging grooves 78, 78 of the engaging portions 72, 72 are disengaged. As a result, the handle portion 56 is made rotatable with respect to the cover plate 38 about the hinge portion 54, and the handle portion 56 is rotated to a position where it extends substantially in the vertical direction.

After that, as shown in FIG. 5B, the needle hub 18 is moved in a direction away from the base plate 12 by picking the grip portion 60 and pulling the handle portion 56 further upward. That is, both side portions sandwiching the hinge portions 100, 110, 112 rotate relatively, and the connecting portion 94 (first connecting portion 102, 102, second connecting portion 104, 104, third connecting portion 106, 106) and the protective bottom wall portion 108 (needle tip protection portion 24) are made to stand up substantially straight upward with respect to the base plate 12. In short, by raising the connecting portion 94 and the protective bottom wall portion 108, the base plate 12 and the needle hub 18 are separated from each other, and the base plate 12 and the needle hub 18 are separated from each other by the connecting portion 94 and the protective bottom. It is connected by a wall portion 108 so as to be accessible and separable.

The movement of the needle hub 18 in the direction away from the base plate 12, that is, the upward movement, is further extended by the connecting portion 94 and the protective bottom wall portion 108 extending substantially straight upward with respect to the base plate 12. The movement is restricted, and the position where the connecting portion 94 and the protective bottom wall portion 108 extend substantially straight upward with respect to the base plate 12 is the position where the needle hub 18 is most separated from the base plate 12. ing.

Further, in the present embodiment, since the front end portion of the base plate 12 and the front end portion of the protective bottom wall portion 108 are connected to each other via the hinge portion 110, the needle hub 18 can be separated from the base plate 12. Along with this, the connecting portion 94 connected to the rear end side of the protective bottom wall portion 108 is pulled up. As a result, the lower end surface 114 of the protective bottom wall portion 108 (needle tip protection portion 24) overlapped with the upper end surface 66 of the base plate 12 rises, and the protective bottom wall portion 108 (needle tip protection portion 24) becomes the hinge portion 110. It is designed to be pulled upward while rotating forward around the center. Along with this, the portion above the needle tip protection portion 24, that is, the connecting portion 94, the puncture needle 16, the needle hub 18, the cover member 36, and the like also move to the front side of the base plate 12 as a whole. In the present embodiment, since the puncture needle 16 moves to the front of the base plate 12, the needle tip 22 of the puncture needle 16 is housed in the needle tip protection portion 24, and then the puncture needle 16 is pulled out. Even when an external force is applied in the opposite direction to the above, the needle tip 22 of the puncture needle 16 can be effectively prevented from re-projecting through the puncture hole 82 or the guide hole 84 provided in the base plate 12.

As the needle hub 18 moves away from the base plate 12, the puncture needle 16 is pulled out of the silicon port 20 and moves upward and forward as shown in FIG. 5 (c), and the needle tip thereof. The needle tip protection portion 22 moves from the rear side to the front side of the needle tip protection portion 24 through the guide hole 84 provided in the base plate 12 and the introduction hole 120 provided in the protection bottom wall portion 108. It is housed in 24 and protected. In other words, the needle tip 22 of the puncture needle 16 that is pulled out from the puncture state and moves to the front side of the base plate 12 is guided from the puncture hole 82 through the guide hole 84 and into the needle tip protection portion 24 from the introduction hole 120. It is designed to be used. That is, the needle tip 22 of the puncture needle 16 passes from the rear to the front (in short, from the lower side to the upper side in the needle tip protection portion 24 in the initial state) through the introduction hole 120 that opens in the lower end surface 114 of the protective bottom wall portion 108. It moves to and is stored in the needle tip protection portion 24. Therefore, in the present embodiment, the direction in which the needle tip 22 of the puncture needle 16 enters the needle tip protection portion 24 is from the rear to the front of the needle tip protection portion 24 (from the lower side to the upper side in the needle tip protection portion 24 in the initial state). Direction). Then, in the protected state of the needle tip 22, the protective bottom wall portion 108 of the needle tip protection portion 24 that is pulled up from the base plate 12 and stands up in front of the base plate 12 to which the needle tip 22 of the puncture needle 16 pulled out from the patient moves. Is opposed to the puncture needle 16.

In particular, in the present embodiment, in the protected state of the needle tip 22 of the puncture needle 16, the needle tip 22 of the puncture needle 16 is inside the locking member 140, that is, the arm portions 142 and 142 including the inward protrusions 146 and 146. The area is accommodated in the area surrounded by the connection portion 144, and the area inside the needle tip protection portion 24, particularly the inside of the locking member 140, is a storage area for accommodating the needle tip 22 of the puncture needle 16. It is said to be 158.

The operation of storing the puncture needle 16 in the storage area 158 will be described with reference to FIGS. 6A and 6B. 6 (a) and 6 (b) schematically show the relative positional relationship between the locking member 140 and the puncture needle 16, and the locking member 140 is assembled to the needle tip protection portion 24. It is shown in the state of being punctured.

That is, in the initial state, the arm portions 142 and 142 of the locking member 140 extend in the vertical direction, but as the puncture needle 16 is pulled out, the needle tip protection portion 24 gradually rotates forward around the hinge portion 110. Be punished. As a result, the arm portions 142 and 142 of the locking member 140 are tilted so as to gradually extend in the front-rear direction. As a result, as shown in FIG. 6A, the puncture needle 16 approaches the locking member 140 from the rear due to the forward movement (upward in FIG. 6) accompanying the pulling out of the puncture needle 16. It is punctured (in the direction of the white arrow in FIG. 6A). Specifically, the puncture needle 16 is brought close to the abutting portion of the inward protrusions 146 and 146 of the locking member 140 from behind.

Then, by further pulling out the puncture needle 16 and moving it forward, the butt portion of the inward protrusions 146 and 146 comes into contact with the puncture needle 16, and by further moving the puncture needle 16 forward, it is inward. The protrusions 146 and 146 are elastically deformed forward (on the protruding base end side of the arms 142 and 142) to allow the puncture needle 16 to pass between the butts at the protruding tips of the inward protrusions 146 and 146. A gap is formed. As a result, as shown in FIG. 6B, the needle tip 22 of the puncture needle 16 is guided into the front of the inward protrusions 146 and 146, that is, into the storage area 158 through the gap. Then, after the puncture needle 16 has passed through the inward protrusions 146 and 146, the elastic restoration deformation of the inward protrusions 146 and 146 eliminates the gap between the protruding tips of the inward protrusions 146 and 146. The protruding tips of the inward protrusions 146 and 146 are again abutted against each other to bring them into contact with each other.

As a result, after the needle tip 22 of the puncture needle 16 is stored in the storage area 158, the movement of the puncture needle 16 to the rear is prevented, and the needle tip 22 of the puncture needle 16 becomes the needle tip protection portion 24. After being stored, the needle tip 22 is prevented from re-protruding from the needle tip protection portion 24.

In the present embodiment, the guide hole 84 and the introduction hole 120 communicate with each other and are open to the outside at the front end of the guide hole 84 and the lower end of the introduction hole 120, so that the puncture needle 16 is pulled out. As a result, when the needle tip 22 of the puncture needle 16 passes through the guide hole 84 and the introduction hole 120, the needle tip 22 does not come into contact with the base plate 12 or the protective bottom wall portion 108. This prevents the generation of sound due to the contact between the puncture needle 16 and the base plate 12 and the protective bottom wall portion 108 when the puncture needle 16 is pulled out. Therefore, when the puncture needle 16 is pulled out, the user mistakenly recognizes that the needle tip 22 of the puncture needle 16 is stored in the needle tip protection portion 24 even though the needle tip 22 is not sufficiently stored, and discards the puncture needle 16. The risk can be reduced.

In the needle assembly 10 having the above structure, the needle tip 22 of the puncture needle 16 is stored in the needle tip protection portion 24 by assembling the locking member 140, which is a separate member, to the needle tip protection portion 24. A mechanism for preventing the puncture needle 16 from re-protruding from the needle tip protection portion 24 is configured, and the mechanism can be easily configured. Further, since the needle tip protection portion 24 and the locking member 140 are separate members, for example, the material of the locking member 140 may be different from that of the needle tip protection portion 24 to prevent the puncture needle 16 from re-protruding. It is also possible to make it more stable.

In particular, in the present embodiment, the needle tip protection portion 24 is provided with an assembly hole 128 that penetrates the front wall portion 124 in the vertical direction, and the locking member 140 is fitted into the assembly hole 128 from the outside (upper side). Since the locking member 140 is assembled by inserting the locking member 140, the locking member 140 can be easily assembled to the needle tip protection portion 24. The assembly hole 128 in the needle tip protection portion 24 is not limited to the aspect of penetrating in the vertical direction. It may be assembled. That is, the assembling direction of the locking member 140 with respect to the needle tip protection portion 24 is not limited, and may be a non-penetrating mode.

Further, in the single state of the locking member 140 before being assembled to the needle tip protection portion 24, since the gap 148 is provided between the protruding tips of the inward protrusions 146 and 146, the arm portions 142 and 142 are provided. Can be easily allowed to be deformed inward in the facing direction, and the resistance of the locking member 140 to the needle tip protection portion 24 can be reduced. Then, after the locking member 140 is assembled to the needle tip protection portion 24, the arm portions 142 and 142 are deformed in a direction in which they approach each other, and the protruding tip portions of the inward protrusions 146 and 146 mutually approach each other. Since the inward protrusions 146 and 146 are allowed to be deformed in the protruding tip direction because they are abutted and brought into contact with each other, it is difficult to deform the inward protrusions 146 and 146 in the protruding base end direction. To. This can more effectively prevent the puncture needle 16 from re-protruding from the needle tip protection portion 24.

Furthermore, in the present embodiment, the base plate 12 is provided with a puncture hole 82, and in the initial state, the puncture needle 16 extending from the needle hub 18 extends below the base plate 12 through the puncture hole 82. Then, as the puncture needle 16 is pulled out, the needle tip 22 of the puncture needle 16 moves forward from the puncture hole 82 and is housed in the needle tip protection portion 24. Therefore, in the protected state of the needle tip 22, the puncture needle is stored. 16 and the puncture hole 82 are positioned so as to be offset from each other. As a result, even when an external force is applied to the puncture needle 16 in the retracted state in the direction opposite to the pulling direction, the possibility that the puncture needle 16 re-projects through the puncture hole 82 can be reduced.

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

For example, in the above-described embodiment, in the deployed state of the base member 14, the guide hole 84 provided in the base plate 12 and the introduction hole 120 provided in the protective bottom wall portion 108 communicate with each other, and the hinge portion 110 communicates with each other. The guide hole 84 and the introduction hole 120 are opened to the front of the needle assembly 10 by bending, but the present invention is not limited to this mode. That is, in the deployed state of the base member 14, the guide hole 84 and the introduction hole 120 do not need to communicate with each other, and in short, for example, the guide hole 84 is not essential in the present invention. Alternatively, the front side of the introduction hole 120 may be blocked by the protective bottom wall portion 108.

Further, in the above embodiment, the base plate 12 and the connecting portion 94 are connected by the hinge portions 110 and 112 via the protective bottom wall portion 108, but the present invention is not limited to this. That is, the base plate 12 and the connecting portion 94 may be directly connected, and in such a case, the needle tip protection portion 24 may be fixed to the base plate 12 by integral molding or the like instead of hinge connection. Even in such a case, the puncture needle 16 is anterior to the puncture hole 82 from the viewpoint of shifting the positions of the puncture needle 16 and the puncture hole 82 after extraction to prevent the puncture needle 16 from re-protruding. However, the puncture needle 16 is accommodated in the needle tip protection portion 24 without moving forward with respect to the puncture hole 82. You may.

That is, the needle tip 22 of the puncture needle 16 may be slid straight upward and housed in the needle tip protection portion 24. In such a case, for example, in the state before the protection mechanism is activated, the puncture needle 16 is punctured. The needle 16 is inserted into the storage area 158 and protrudes downward, or is inserted through a through hole penetrating the locking member 140 in the vertical direction and protrudes downward through a pair of inward protrusions 146 and 146. You may. In such an embodiment, for example, when the puncture needle 16 is inserted into the storage area 158, the puncture needle 16 faces the inward protrusions 146 and 146 outward in the opposite direction in the state before the protection mechanism is activated. The puncture needle 16 inserted into the storage area 158 at a position away from the inner protrusions 146 and 146 pushes the inner protrusions 146 and 146 when the puncture needle 16 is removed. You may try to spread it out. In short, if the inward protrusions 146 and 146 expanded by removing the puncture needle 16 are restored and deformed inward in the facing direction to cover the needle tip 22 and are configured to prevent re-projection. good. Further, when the puncture needle 16 penetrates the locking member 140 and extends in the vertical direction, the inward protrusions 146 and 146 are pushed outward by the puncture needle 16 in the opposite direction, and the puncture needle 16 is pushed. By removing the needle tip 146 and 146, the inward protrusions 146 and 146 may be restored and deformed inward in the facing direction to cover the needle tip 22 and prevent re-projection. When such a structure is adopted, since the inward protrusions 146 and 146 are not deformed in the thickness direction, it is not necessary to form a thin plate shape that can be easily deformed in the thickness direction. For example, a thick block may be formed so that the inward protrusions 146 and 146 cover the needle tip 22 due to deformation of both arm portions 142 and 142.

When the needle tip protection portion 24 is fixed to the base plate 12 as described above, for example, in the initial state, the puncture needle 16 is provided in the base plate 12 behind the needle tip protection portion 24 for puncture holes. By adopting a structure that protrudes from the base plate 12 through 82, the puncture needle 16 moves forward as the puncture needle 16 is pulled out, and the puncture needle 16 moves forward from the insertion groove 118 provided in the vertical wall portion 116, that is, the needle tip protection portion 24. It is also possible to introduce the puncture needle 16 into the needle tip protection portion 24 from the rear side, which is lateral to the needle tip protection portion 24. In such a case, the locking member 140 is assembled so that the arm portions 142 and 142 extend in the front-rear direction with respect to the needle tip protection portion 24, so that the inward protrusion 146 provided on the arm portions 142 and 142 is provided. , 146 The needle tip 22 of the puncture needle 16 is introduced into the needle tip protection portion 24, while the needle tip protection portion 24 of the needle tip 22 of the puncture needle 16 is introduced by the inward protrusions 146 and 146. Re-protrusion from the can be prevented. That is, in such an embodiment, the wall portion of the needle tip protection portion 24 is configured by the vertical wall portion 116, and the needle tip 22 of the puncture needle 16 provided on the wall portion (vertical wall portion 116) is provided with the needle tip protection portion 24. The introduction hole to be introduced into is configured by the insertion groove 118.

Further, in the present invention, the cover member 36 is not indispensable, and when the puncture needle 16 is pulled out, for example, the needle hub 18 may be directly gripped and pulled up.

Further, in the above-described embodiment, the base member 14 is formed as an integrally molded product including a base plate 12, a protective bottom wall portion 108, a connecting portion 94, a fixing portion 86, and the like, but these are formed separately and later. It may be fixed. The structure of the base plate (base portion) 12 is not limited in any way, and may be, for example, a simple plate shape. Further, the structure of the connecting portion 94 is not limited in any way. For example, the connecting portion 94 may be folded in more stages than in the above embodiment, and the needle hub 18 may be brought closer to the base portion (base plate 12). The connecting portion 94 that is separably connected may have a slidable extension member or a hinge portion that can rotate around a hinge equipped with a rotating pin, and may be linear such as a string member. A bendable member such as a member can also be used.

Furthermore, in the above embodiment, when the locking member 140 is assembled to the needle tip protection portion 24, the arm portions 142 and 142 of the locking member 140 are the inner surfaces 130 of the side wall portions 122 and 122 of the needle tip protection portion 24. , 130 was pressed to deform inward in the opposite direction, but the present invention is not limited to this mode. That is, when the locking member 140 is assembled to the needle tip protection portion 24, the arm portions 142 and 142 of the locking member 140 do not have to be deformed, and before being assembled to the needle tip protection portion 24 of the locking member 140. In the single state, the gap 148 between the protruding tips of the inward protrusions 146 and 146 may not be formed. However, in the state where the locking member 140 is assembled to the needle tip protection portion 24, the protruding tips of the inward protrusions 146 and 146 do not have to be abutted against each other to be in contact with each other, and the inward protrusion 146 does not have to be brought into contact with each other. , 146 may have a gap 148 between the protruding tips.

Further, in the above-described embodiment, the locking member 140 is an integrally molded product of synthetic resin, but the present invention is not limited to this aspect. For example, as the locking member 140, a two-color molded product using a partially different resin, a composite molded product using a partially different material, or the like can be adopted. That is, in the locking member 140, by forming the arm portions 142 and 142 with a material having a lower elastic modulus, elastic deformation inward in the facing direction is facilitated, and the inward protrusions 146 and 146 are made of metal or the like. By forming the puncture needle 16 from a harder material, the re-projection of the puncture needle 16 from the needle tip protection portion 24 can be prevented more effectively.

In the above embodiment, the locking member 140 having the pair of arm portions 142 and 142 (pair of inward protrusions 146 and 146) is separated from the needle tip protection portion 24 and the needle tip protection portion is provided. Although it was assembled to 24, for example, in a direction in which the needle tip 22 approaches each other and in a direction in which the needle tip 22 enters the needle tip protection portion 24, respectively, on the inner surfaces 130 and 130 of the side wall portions 122 and 122 constituting the needle tip protection portion 24. Inward protrusions 146 and 146 that are inclined and projecting may be integrally formed. In such a case, it is not necessary to assemble a separate locking member 140 to the needle tip protection portion 24.

Further, in the above-described embodiment, the inward protrusions 146 and 146 are inclined and protrude in the direction toward the protruding base end side (upward) of the arm portions 142 and 142 as they become inward in the facing direction. The projecting portions 146 and 146 may project vertically from the arm portions 142 and 142 and approach each other.

10: Needle assembly, 12: Base plate (base part), 16: Puncture needle, 18: Needle hub, 20: Silicon port (puncture part), 22: Needle tip, 24: Needle tip protection part, 94: Connection part, 120: Introduction hole, 125: Peripheral wall part, 128: Assembly hole, 140: Locking member, 142: Arm part, 146: Inner protrusion part, 148: Gap

Claims (6)

In a needle assembly provided with a needle tip protection part for storing the needle tip of the puncture needle pulled out from the puncture state.
By applying the pulling operation force of the puncture needle to the needle tip protection portion, the needle tip protection portion itself is displaced in conjunction with the pulling out of the puncture needle, and the wall of the needle tip protection portion is formed. The portion is provided with an introduction hole into which the needle tip of the puncture needle enters with the displacement of the needle tip protection portion, while the introduction hole portion of the needle tip protection portion is directed toward each other in an approaching direction. A pair of inward protrusions protruding from the side are arranged, and when the puncture needle is pulled out, the puncture needle passes from the side between the abutments of the inner protrusions , and the needle tip of the puncture needle is the needle . A needle assembly characterized by being able to be introduced into the puncture protection section. It has a locking member provided with the pair of inward protrusions protruding from the tips of the pair of arms facing each other, which are integrally connected on the base end side, and the locking member is the needle. The needle assembly according to claim 1, which is assembled to the needle tip protection portion as a member separate from the tip protection portion. The needle assembly according to claim 2, wherein the pair of arms are deformed by moving the pair of arms in an approaching direction by assembling the locking member to the needle tip protection portion. The locking member has a gap between the tips of the pair of inward protrusions in a single state before being assembled to the needle tip protection portion, and is in a state of being assembled to the needle tip protection portion. The needle assembly according to claim 3, wherein the tips of the pair of inward protrusions are in contact with each other. An assembly hole into which the locking member can be assembled is formed in the peripheral wall portion of the needle tip protection portion that protects the needle tip of the puncture needle, and the locking member is provided with respect to the assembly hole. The needle assembly according to any one of claims 2 to 4, wherein the needle assembly is fitted and assembled. The needle hub of the puncture needle is connected to the base portion superimposed on the puncture portion so as to be accessible and separable by the connecting portion, and the needle hub is punctured at the approach position of the needle hub to the base portion. The needle tip of the puncture needle moves to the front side of the base portion as the needle hub is separated from the base portion by pulling out the puncture needle, and the needle hub moves to the front side of the base portion. The claim that the needle tip protection portion for accommodating the needle tip of the puncture needle is provided at a position, and the pair of inward protrusions are arranged with respect to the wall portion of the needle tip protection portion. The needle assembly according to any one of 1 to 5.

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