WO2022118837A1 - Indwelling needle assembly - Google Patents

Abstract

Provided is an indwelling needle assembly having a novel structure that can solve at least one of inherent problems of indwelling needle assemblies having the conventional structure.　This indwelling needle assembly 10 comprises a needle tip protector 66. The needle tip protector 66 has needle tip protection parts 72a, 72b located laterally away from an inner needle 14. The indwelling needle assembly 10 comprises an abutting part 60 that stops at an outer needle hub 20 and abuts on the pair of needle tip protection parts 72a, 72b to displace the needle tip protection parts 72a, 72b in the direction approaching the inner needle 14, and consequently leads the needle tip protection parts 72a, 72b to a protection position at which the needle tip 22 of the inner needle 14 having been drawn is covered, when the inner needle 14 is drawn from an outer needle 18. A pusher 54 that switches a valve body 62 is disposed at a position closer to the base end than the valve body 62 within an outer needle hub 36. At least a part of the needle tip protector 66 is housed inside the pusher 54.

Description

Indwelling needle assembly

The present invention relates to an indwelling needle assembly that is punctured into a blood vessel during infusion, blood sampling, artificial dialysis, or the like.

Conventionally, an indwelling needle assembly that is punctured into a blood vessel during infusion, blood sampling, artificial dialysis, etc. has been known. As shown in Japanese Patent Application Laid-Open No. 2010-08520 (Patent Document 1), the indwelling needle assembly is provided on the base end side of the inner needle by inserting the inner needle into the outer needle so as to be retractable. The needle hub and the outer needle hub provided on the base end side of the outer needle have a structure in which they are combined with each other. Then, by puncturing the blood vessel together with the inner needle and then pulling out the inner needle from the outer needle, the indwelling needle having the outer needle and the outer needle hub is indwelled in the state of being punctured in the blood vessel.

By the way, Patent Document 1 proposes an indwelling needle assembly provided with a needle tip protector that protects the needle tip of the inner needle so that the inner needle pulled out from the outer needle is not accidentally re-punctured. That is, Patent Document 1 has a structure in which the protector body arranged on the inner circumference of the outer needle hub moves to the tip of the inner needle by pulling out the inner needle from the outer needle to protect the needle tip of the inner needle. ing. In Patent Document 1, when the inner needle is inserted into the outer needle, the protector main body is separated from the inner needle, and when the inner needle is pulled out, the resistance force due to the friction between the inner needle and the protector main body does not act. ing. Then, when the protector body moves to the base end side together with the inner needle, the action ring attached to the inner peripheral surface of the outer needle hub moves to the tip end side of the protector body, and the action ring deforms the tip portion of the protector body. Move it to a position that covers the tip side of the inner needle. As a result, the needle tip of the inner needle is covered and protected by the protector body.

Japanese Unexamined Patent Publication No. 2010-08520

However, in Patent Document 1, since the protector main body is held in a state of protecting the needle tip of the inner needle, the protector main body needs to be deformed by the action ring, so that it is a separate body that can be separated from the outer needle hub. It was necessary to provide an action ring.

Further, as shown in Japanese Patent Application Laid-Open No. 2007-136246, an indwelling needle assembly provided with a valve body has also been proposed. The slit of the valve body is opened by inserting the tip of the tapered pusher into the slit of the valve body. However, in the indwelling needle assembly having such a structure, since the pusher has a diameter that can be inserted into the slit, the internal space of the pusher tends to be narrowed, and the needle tip protector or the like housed inside the pusher or the like. In some cases, the size and shape of the

The problem to be solved by the present invention is to provide an indwelling needle assembly having a novel structure capable of solving at least one of the problems inherent in the indwelling needle assembly having the conventional structure as described above.

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 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 embodiments can be realized without being limited to the embodiments described below.

In the first aspect, the inner needle having the inner needle hub on the proximal end side is inserted into the outer needle having the outer needle hub on the proximal end side so as to be pullable, and the inner needle is pulled out from the outer needle. An indwelling needle assembly provided with a needle tip protector that protects the needle tip of the needle, wherein the needle tip protector has a needle tip protector located laterally away from the inner needle, and the inner needle. When the needle is pulled out from the outer needle, the inner needle is pulled out by stopping at the outer needle hub, contacting the needle tip protection portion, and displacing the needle tip protection portion toward the inner needle. It is provided with a contact portion that leads to a protective position that covers the needle tip, and a pusher that switches the valve body is arranged inside the outer needle hub on the proximal end side of the valve body, and at least the needle tip protector is provided. A part of it is housed inside the pusher.

According to the indwelling needle assembly having a structure according to this aspect, when the inner needle is pulled out from the outer needle, the needle tip protection portion of the needle tip protector is deformed and displaced in the direction approaching the inner needle by the contact portion. The needle tip of the inner needle is covered and protected by the needle tip protection portion.

In the second aspect, the inner needle having the inner needle hub on the proximal end side is inserted into the outer needle having the outer needle hub on the proximal end side so as to be retractable, and the valve body is inserted inside the outer needle hub. The pusher to be switched is an indwelling needle assembly arranged on the proximal end side of the valve body, and at least a part of the needle tip protector that protects the needle tip of the inner needle pulled out from the outer needle is the pusher. The pusher is provided with a small cylinder portion and a large cylinder portion, the large cylinder portion is formed on the tip side of the small cylinder portion, and the large cylinder portion has an internal dimension larger than that of the small cylinder portion. Is made larger.

According to the indwelling needle assembly having a structure according to this aspect, a large space is secured inside the large cylinder portion of the pusher, and the size and shape of the needle tip protector and the like housed inside the large cylinder portion are not easily restricted.

In the third aspect, the inner needle having the inner needle hub on the proximal end side is inserted into the outer needle having the outer needle hub on the proximal end side so as to be retractable, and the valve body is inserted inside the outer needle hub. The pusher to be switched is an indwelling needle assembly arranged on the proximal end side of the valve body, and at least a part of the needle tip protector that protects the needle tip of the inner needle pulled out from the outer needle is the pusher. The pusher is housed in an input portion to which an external force for pressing the pusher against the valve body is input, and an action portion provided on the tip side of the input portion to push the valve body open. The working part has a larger diameter than the input part.

According to the indwelling needle assembly having a structure according to this embodiment, an input portion having a diameter smaller than that of the acting portion is provided on the proximal end side, so that, for example, a male is inserted and connected to an outer needle hub from the proximal end opening. The luer is pressed against the base end surface of the pusher, and the external force that pushes the pusher against the valve body is effectively input to the pusher. Further, when the outer peripheral side of the valve body is pressed by the acting portion, a force from the valve body to the base end side is likely to be applied to the pusher, and when the external force for pressing the pusher against the valve body is released, the force is released. It becomes easier for the pusher to return to the initial position.

In the fourth aspect, in the indwelling needle assembly according to the third aspect, the input portion is housed in the luer insertion portion on the proximal end side of the outer needle hub, and the outer diameter dimension of the working portion is large. It is made larger than the inner diameter of the lure insertion portion.

According to the indwelling needle assembly having a structure according to this aspect, the movement toward the base end of the pusher is restricted by the locking of the tip of the luer insertion part and the base end of the action part. Therefore, for example, when the needle tip protector is pulled out to the base end while sliding against the pusher, it is possible to prevent the pusher from being pulled out from the outer needle hub together with the needle tip protector.

In the fifth aspect, the inner needle having the inner needle hub on the proximal end side is inserted into the outer needle having the outer needle hub on the proximal end side so as to be retractable, and the valve body is inserted inside the outer needle hub. The pusher to be switched is an indwelling needle assembly arranged on the proximal end side of the valve body, and at least a part of the needle tip protector that protects the needle tip of the inner needle pulled out from the outer needle is the pusher. The pusher is housed in an input portion to which an external force for pressing the pusher against the valve body is input, and an action portion provided on the tip side of the input portion to push the valve body open. The working portion having a diameter larger than that of the input portion has an outer dimension larger than the inner dimension of the base end portion of the outer needle hub.

According to the indwelling needle assembly having a structure according to this embodiment, since the tip portion of the pusher is a large-diameter working portion, a large space is secured inside the working portion and is accommodated inside the working portion. It is difficult to limit the dimensions and shape of the needle tip protector and the like.

A sixth aspect is that in the indwelling needle assembly according to the fourth or fifth aspect, the valve body is formed with a slit that penetrates the inner peripheral portion in the needle axis direction of the inner needle. The outer peripheral end of the working portion is located on the outer periphery of the slit.

According to the indwelling needle assembly having a structure according to this aspect, when the working part is pressed against the valve body, it is possible to prevent the entire working part from entering the slit of the valve body. Therefore, for example, when the opening and closing operation of the valve body by the pusher is repeatedly executed, it is possible to avoid a situation in which the pusher cannot come out of the slit of the valve body and cannot return from the open position to the closed position.

In the seventh aspect, the inner needle having the inner needle hub on the proximal end side is inserted into the outer needle having the outer needle hub on the proximal end side so as to be retractable, and the valve body is inserted inside the outer needle hub. The pusher to be switched is an indwelling needle assembly arranged on the proximal end side of the valve body, and at least a part of the needle tip protector that protects the needle tip of the inner needle pulled out from the outer needle is the pusher. Contained inside the pusher, the pusher comprises a tip member attached to an opening on the distal end side of the proximal member, at least a portion of the distal opening of the proximal member. It is blocked by.

According to the indwelling needle assembly having a structure according to this aspect, for example, the internal space of the pusher can be secured by the base end member. Further, even when the needle tip protection protector moves to the tip side due to the tip opening of the accommodating area of the needle tip protection protector in the pusher being blocked at least in a part by the tip member, the needle tip protection is performed. Since the amount of movement of the protector to the tip side is limited by the tip member, it is possible to prevent the needle tip protection protector from interfering with the valve body arranged at the tip rather than the pusher.

In the eighth aspect, in the seventh aspect, the tip member includes an insertion portion having a diameter smaller than that of the tip opening of the base end member. According to the indwelling needle assembly having a structure according to this embodiment, when the pusher is pressed against the valve body to push open the slit of the valve body, the small diameter insertion portion is easily inserted into the slit of the valve body, and the insertion portion is formed. Is inserted, the slit is easily opened, and the opening operation of the valve body is stabilized.

In the ninth aspect, the inner needle having the inner needle hub on the proximal end side is inserted into the outer needle having the outer needle hub on the proximal end side so as to be retractable, and the valve body is inserted inside the outer needle hub. The pusher to be switched is an indwelling needle assembly arranged on the proximal end side of the valve body, and the opening portion at the tip of the pusher has a flat tubular shape, and the pusher has a flat direction. Insertion protrusions that project toward the tips on both sides and can be inserted into the slits formed in the valve body are formed.

According to the indwelling needle assembly having a structure according to this aspect, the slit is effectively widened by inserting the insertion protrusion of the pusher into the slit of the valve body, and the stable opening operation of the valve body is realized. Will be done. Further, since the large diameter portion of the pusher orthogonal to the flat direction is not inserted into the slit of the valve body, for example, when the valve body is repeatedly opened and closed by the pusher, the insertion protrusion is inserted into the slit. It becomes easy to return from the opened position to the initial closed position. In particular, the large-diameter portion orthogonal to the flattening direction of the pusher is pressed against the outer peripheral portion of the valve body without being inserted into the slit, so that the elastic restoring force of the valve body moves the pusher to the closed position. It acts in the direction of making the pusher move from the open position to the closed position of the pusher more stably.

In the tenth aspect, the inner needle having the inner needle hub on the proximal end side is inserted into the outer needle having the outer needle hub on the proximal end side so as to be retractable, and the valve body is inserted inside the outer needle hub. The pusher to be switched is an indwelling needle assembly arranged on the proximal end side of the valve body, and is provided with a needle tip protector that protects the needle tip of the inner needle pulled out from the outer needle. The opening portion at the tip of the needle has a flat tubular shape, and a protector accommodating portion for accommodating at least a part of the needle tip protector is provided inside the pusher having a flat tubular shape. Is.

According to the indwelling needle assembly having a structure according to this aspect, the wasted space in the pusher when the needle tip protector is housed can be reduced especially in the flat direction, and the dimensions of the needle tip protector are limited. It is possible to reduce the size of the pusher and the outer needle hub without doing so. The flat tubular shape means a cylindrical shape in which the external dimensions in the cross-sectional shape in the direction perpendicular to the axis are different from each other in the two orthogonal directions.

The eleventh aspect is the indwelling needle assembly according to the tenth aspect, and the pusher can be inserted into a slit formed in the valve body so as to project toward the tip on both sides in the flat direction. The insertion protrusion is provided.

According to the indwelling needle assembly having a structure according to this aspect, a stable opening operation of the valve body is realized by inserting the insertion protrusion of the pusher into the slit of the valve body.

According to the present invention, it is possible to solve at least one of the problems inherent in the indwelling needle assembly having the conventional structure as described above.

Right side view showing the indwelling needle assembly as the first embodiment of the present invention. It is a cross-sectional view of the indwelling needle assembly shown in FIG. 1, and corresponds to the II-II cross section of FIG. Section III-III sectional view of FIG. FIG. 3 is a cross-sectional view showing a tip portion of an inner needle constituting the indwelling needle assembly of FIG. An enlarged perspective view of the needle tip protector constituting the indwelling needle assembly of FIG. 1. A perspective view showing the needle tip protector of FIG. 5 at another angle. Right side view of the needle tip protector shown in FIG. Bottom view of the needle tip protector shown in FIG. IX-IX sectional view of FIG. It is sectional drawing which shows the part of the indwelling needle assembly of FIG. FIG. 1 is a cross-sectional view showing a part of the indwelling needle assembly of FIG. 1, showing a state in which the needle tip is protected by a needle tip protector while the inner needle is being pulled out. A perspective view showing the needle tip protector of FIG. 5 in the needle tip protection state. FIG. 1 is an enlarged cross-sectional view showing a part of the indwelling needle assembly of FIG. 1, showing a state in which the inner needle unit is separated from the indwelling needle. It is sectional drawing which shows the part of the indwelling needle assembly as 2nd Embodiment of this invention, and corresponds to the XIV-XIV sectional | cross section of FIG. FIG. 14 is a cross-sectional view taken along the line XV-XV. A perspective view of a pusher constituting the indwelling needle assembly of FIG. A perspective view showing the pusher of FIG. 16 at another angle. Front view of pusher shown in FIG. Sectional drawing which shows a part of the indwelling needle assembly as the 3rd Embodiment of this invention. A perspective view of a pusher constituting the indwelling needle assembly of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 to 3 show an indwelling needle assembly 10 as a first embodiment of the present invention. The indwelling needle assembly 10 has a structure in which the inner needle 14 constituting the inner needle unit 12 is inserted into the outer needle 18 constituting the indwelling needle 16 and the inner needle unit 12 and the indwelling needle 16 are combined. There is. In the following description, as a general rule, the vertical direction refers to the vertical direction in FIG. 1, and the horizontal direction refers to the vertical direction in FIG. 3. Further, the left side in FIG. 1, which is distal to the distal end side, and the right side in FIG. 1, which is proximal to the proximal end side, are referred to.

The inner needle unit 12 has a structure in which the inner needle hub 20 is fixed to the inner needle 14. The inner needle 14 is a hard member made of metal or the like, and is a hollow needle in the present embodiment. The tip surface of the inner needle 14 is cut into an inclined shape, and a sharp needle tip 22 is formed. As shown in FIG. 4, the tip portion of the inner needle 14 is provided with a closing portion 24 for blocking the lumen. A pair of locking protrusions 26, 26 protruding from the outer peripheral surface are formed at the tip portion of the inner needle 14. The locking projection 26 projects in the left-right direction (vertical direction in FIGS. 3 and 4), and is formed by, for example, partially crushing the inner needle 14 in the vertical direction. In the present embodiment, the locking projection 26 is provided in the closing portion 24 of the inner needle 14, but the locking projection 26 may be provided in the hollow portion of the inner needle 14 that is out of the closing portion 24. Further, the inner needle 14 does not have to be provided with the closing portion 24, and for example, the lumen of the inner needle 14 may be formed so as to penetrate from the tip end to the base end.

The inner needle hub 20 includes a hub main body 28 as shown in FIGS. 1 to 3. The hub body 28 has a substantially rectangular tubular shape at the tip end portion and a substantially cylindrical shape at the base end portion. The outer peripheral surface of the tip portion of the hub body 28 is curved in the axial direction and has a small diameter from both ends in the axial direction toward the center, so that the fingers do not slip easily when being picked up by fingers and moved in the axial direction. There is. The hub main body 28 integrally includes a substantially cylindrical inner needle holding portion 30 that protrudes from the inner peripheral surface of the tip portion and extends toward the base end. The inner peripheral surface of the inner needle holding portion 30 is adhered to the outer peripheral surface of the inner needle 14, and the hub main body 28 is fixed to the inner needle 14. The tip of the hub body 28 is provided with a flange-shaped portion 32 projecting toward the outer periphery, so that the tip surface of the hub body 28 has an inner diameter smaller and an outer diameter larger than the base end surface of the outer needle hub 36 described later. ing.

A cap member 34 is attached to the base end opening portion of the hub main body 28. The cap member 34 has a substantially cylindrical shape as a whole. The cap member 34 has a tapered outer peripheral surface in which the tip portion having a small diameter is reduced in diameter toward the tip, and the tip portion is fitted to the base end opening portion of the hub body 28 to fit the hub body. It is attached to 28. A breathable filter 35 is attached to the base end opening portion of the cap member 34, and the air inside the cap member 34 can be discharged to the outside through the breathable filter 35, while being inside by, for example, flashback at the time of puncture. Blood that has entered the inside of the cap member 34 through the needle 14 does not pass through the breathable filter 35 and does not leak from the inside of the cap member 34. The cap member 34 is preferably transparent or translucent so that the flashback at the time of puncturing the blood vessel of the inner needle 14 can be easily visually recognized.

The indwelling needle 16 has a structure in which the outer needle hub 36 is provided at the base end of the outer needle 18. The outer needle 18 is a hollow needle made of resin or metal. It is desirable that the outer needle 18 has a tapered surface whose outer peripheral surface of the tip portion has a smaller diameter toward the tip.

The base end portion of the outer needle 18 is inserted into the inner circumference of the tubular outer needle hub 36 and fixed to the outer needle hub 36. The outer needle hub 36 is, for example, a resin tubular body. The outer needle hub 36 of the present embodiment has a structure in which a needle fixing member 38 constituting a tip portion and a luer connecting member 40 constituting a base end portion are combined. However, the outer needle hub 36 may be entirely composed of one component, or may be configured by combining three or more components. Further, when a plurality of parts are combined to form the outer needle hub 36, these parts may be fixed by being fitted by being non-adhesive, or may be fixed by means such as adhesion or welding. May be good.

The needle fixing member 38 has a cylindrical shape as a whole, and has a tapered portion 42 having a large diameter toward the proximal end in the middle of the axial direction, and the proximal end side of the tapered portion 42 has a larger diameter than the tip end side. It is said that. The needle fixing member 38 is formed with engaging holes 44, 44 penetrating in the vertical direction, and is provided with a tapered inner peripheral surface whose proximal end side expands toward the proximal end with respect to the engaging hole 44. There is. Then, the outer needle 18 is inserted into the tip portion of the needle fixing member 38 having a small diameter, and the outer needle 18 is fixed to the needle fixing member 38 by a cylindrical pin.

The luer connecting member 40 is cylindrical as a whole, and a step 46 is provided in the middle in the axial direction, and the tip side of the step 46 is a hub connecting portion 48 having a large diameter, and the base end side has a small diameter. It is said to be the lure insertion portion 50 of the above. A pair of engaging claws 52 are provided on the outer peripheral surface of the hub connecting portion 48, and the engaging claws 52 are engaged with the inner surface of the engaging hole 44 provided in the needle fixing member 38. The needle fixing member 38 and the luer connecting member 40 are connected to form the outer needle hub 36. The inner peripheral surface of the luer insertion portion 50 has a luer taper that expands in diameter toward the base end.

The pusher 54 is housed in the luer connecting member 40 of the outer needle hub 36. The pusher 54 has a substantially stepped cylindrical shape as a whole, and has a protector accommodating portion 55 penetrating in the axial direction inside. The pusher 54 has an input portion 56 whose base end portion is a small cylinder portion having a small diameter, and an action portion 58 whose tip portion is a large cylinder portion having a larger diameter than the input portion 56. The input portion 56 and the action portion 58 are formed by a stepped contact portion 60 that protrudes toward the inner circumference of the outer needle hub 36 and the pusher 54 at the base end of the action portion 58 located inside the outer needle hub 36. It is provided integrally and continuously. The shape of the inner peripheral surface of the pusher 54 is a quadrangle corresponding to the first needle insertion portion 68 of the needle tip protector 66 described later in the input portion 56, and is circular in the action portion 58. As a result, the protruding dimension of the contact portion 60 from the acting portion 58 changes in the circumferential direction. The internal dimension of the working portion 58 in the direction perpendicular to the axis is larger than the internal dimension of the input portion 56 in the direction perpendicular to the axis. Therefore, the protector accommodating portion 55 provided on the inner circumference of the pusher 54 has a tip portion having a larger diameter than the base end portion. The shape of the inner peripheral surface of the input unit 56 is not limited to a quadrangle, but preferably, the inner diameter dimension such as an ellipse or a polygon is in the circumferential direction so as to prevent the needle tip protector 66 from rotating. It is said that the shape has changed with. The pusher 54 may be appropriately provided with a slit (hole) or the like that penetrates the peripheral wall.

In the pusher 54, the input portion 56 is housed in the luer insertion part 50 of the luer connecting member 40, and the working part 58 is housed in the hub connecting part 48 of the luer connecting member 40. The input portion 56 of the pusher 54 extends with a substantially constant outer diameter, and a gap is formed between the inner peripheral surface of the luer insertion portion 50 having a luer taper and the outer peripheral surface of the input portion 56. The pusher 54 is positioned in a direction perpendicular to the axis of the outer needle hub 36 by superimposing the outer peripheral surface of the acting portion 58 on the inner peripheral surface of the hub connecting portion 48 of the outer needle hub 36. Further, in the pusher 54, the outer dimension of the acting portion 58 is larger than the inner dimension of the luer insertion portion 50 constituting the proximal end portion of the outer needle hub 36, and the proximal end surface of the acting portion 58 is the outer needle. By being superposed on the step 46 of the hub 36, it is positioned in the axial direction with respect to the outer needle hub 36. The base end of the pusher 54 is located on the tip side of the base end of the outer needle hub 36 (lure connecting member 40), and the pusher 54 is accommodated without protruding from the outer needle hub 36 to the base end. There is.

A valve body 62 is arranged on the tip end side of the pusher 54 inside the outer needle hub 36. The valve body 62 is formed of a resin elastomer or rubber having rubber-like elasticity. The valve body 62 has a substantially disk shape, and the outer peripheral end portion is sandwiched between the needle fixing member 38 constituting the outer needle hub 36 and the luer connecting member 40 in the thickness direction to obtain an outer needle. It is arranged so as to block the lumen of the hub 36. The valve body 62 includes a slit 64 that penetrates the inner peripheral portion. The slit 64 extends radially from the center of the valve body 62, for example, and penetrates the valve body 62 in the left-right direction in FIG. 2, which is the needle axis direction of the inner needle 14. Then, the lumen of the outer needle hub 36 is switched between a communication state through the slit 64 and a blocking state by opening and closing the slit 64 of the valve body 62.

The pusher 54 is arranged on the base end side of the valve body 62, and the outer peripheral edge of the tip of the acting portion 58 of the pusher 54 is located on the outer peripheral side of the outer peripheral end of the slit 64 of the valve body 62. As a result, at least the outer peripheral end of the tip surface of the pusher 54 is located on the outer periphery of the slit 64. More preferably, the inner peripheral edge of the tip of the acting portion 58 is located on the outer peripheral side of the outer peripheral end of the slit 64, and the entire tip surface of the acting portion 58 is located off the outer periphery of the slit 64. The tip of the pusher 54 may be in contact with the valve body 62 supported by the outer needle hub 36, but in the present embodiment, the tip is located away from the base end with respect to the valve body 62.

The protector accommodating portion 55 provided inside the pusher 54 accommodates the needle tip protector 66 as shown in FIGS. 5 to 9. The entire needle tip protector 66 is located inside the pusher 54, preventing the outer needle hub 36 from becoming larger. The needle tip protector 66 is formed of, for example, an elastically deformable metal plate material. The needle tip protector 66 includes a first needle insertion portion 68 extending substantially orthogonal to the needle axis direction of the inner needle 14 at the base end. The first needle insertion portion 68 has a rectangular plate shape, and a first circular hole 70 corresponding to the outer shape of the inner needle 14 is formed in the center so as to penetrate in the thickness direction. The diameter of the first circular hole 70 is larger than the outer diameter of the inner needle 14 at the portion where the locking protrusions 26, 26 are removed, and is larger than the outer diameter dimension of the inner needle 14 at the portion where the locking protrusions 26, 26 are formed. Has also been made smaller.

The needle tip protector 66 includes a pair of needle tip protection portions 72a and 72b. The pair of needle tip protection portions 72a and 72b extend from the upper and lower ends of the first needle insertion portion 68 toward the tip. The needle tip protection portion 72a includes an elastic plate portion 74a extending from the upper end portion of the first needle insertion portion 68 toward the tip end. In the elastic plate portion 74a, the first portion 76a, which is the base end portion, is orthogonal to the vertical direction, and the second portion 78a, which is the intermediate portion, is tilted upward toward the tip, and the third portion is the tip portion. The portion 80a is tilted downward toward the tip. Further, the needle tip protection portion 72a includes a folded portion 82a in which the tip end portion of the third portion 80a is folded downward toward the base end.

A pair of side wall portions 84, 84 are provided on the tip portion of the needle tip protection portion 72a so as to face each other in the left-right direction. The side wall portion 84 extends from the third portion 80a of the elastic plate portion 74a. The side wall portion 84 has a tapered shape in which the protrusion dimension from the needle tip protection portion 72a becomes smaller toward the tip in the lateral view shown in FIG. 7. Since the notch 85 is formed between the folded-back portion 82a and the side wall portion 84 of the needle tip protection portion 72a, the side wall portion 84 is not excessively restrained by the folded-back portion 82a and is deformed by bending in the thickness direction. Is allowed. A locking piece 86 is integrally provided on each of the pair of side wall portions 84 and 84 of the needle tip protection portion 72a. The locking piece 86 extends along the protruding tip of the side wall portion 84, and protrudes inward in the facing direction of the pair of side wall portions 84, 84. As shown in FIG. 9, the locking piece 86 is inclined toward the elastic plate portion 74a in the thickness direction toward the protruding tip.

The needle tip protection portion 72b includes an elastic plate portion 74b extending from the lower end portion of the first needle insertion portion 68 toward the tip end. In the elastic plate portion 74b, the first portion 76b, which is the base end portion, is orthogonal to the vertical direction, and the second portion 78b, which is the intermediate portion, is tilted downward toward the tip, and the third portion is the tip portion. The portion 80b is tilted upward toward the tip. Further, the needle tip protection portion 72b includes a folded portion 82b in which the tip end portion of the third portion 80b is folded upward toward the base end. The folded portion 82a of the needle tip protection portion 72a and the folded portion 82b of the needle tip protection portion 72b are separated from each other in the vertical direction in the projection in the needle axis direction.

The length of the needle tip protection portion 72b from the first needle insertion portion 68 to the tip is shorter than that of the needle tip protection portion 72a. As shown in FIG. 8, the tip of the needle tip protection portion 72b reaches the locking piece 86 of the needle tip protection portion 72a and does not reach the folded portion 82a of the needle tip protection portion 72a. Further, the width dimension of the third portion 80b of the needle tip protection portion 72b in the left-right direction is smaller than that of the third portion 80a of the needle tip protection portion 72a. The width dimension of the third portion 80b is smaller than the distance between the pair of side wall portions 84 and 84 and larger than the distance between the pair of locking pieces 86 and 86.

The needle tip protector 66 is provided with a positioning portion 88 between the pair of needle tip protection portions 72a and 72b facing each other. The positioning portion 88 includes a support portion 90 extending from the first needle insertion portion 68 toward the tip, and a second needle insertion portion 92 facing substantially parallel to the first needle insertion portion 68 on the tip side. The structure is such that the first needle insertion portion 68 and the second needle insertion portion 92 are integrally connected by a support portion 90. A second circular hole 94 is formed in the second needle insertion portion 92 so as to penetrate in the thickness direction. The second circular hole 94 has a diameter larger than that of the first circular hole 70, and has a diameter that allows the locking projections 26, 26 of the inner needle 14 to easily pass through when the inner needle 14 is pulled out. ..

As shown in FIGS. 2 and 3, the needle tip protector 66 is housed in the protector accommodating portion 55 of the pusher 54. That is, the first needle insertion portion 68, the first portions 76a, 76b of the pair of needle tip protection portions 72a, 72b, and the base end portion of the positioning portion 88 are inserted into the tip portion of the input portion 56 of the pusher 54. Has been done. Further, the second portions 78a and 78b and the third portions 80a and 80b of the pair of needle tip protection portions 72a and 72b, and the tip portion of the positioning portion 88 including the second needle insertion portion 92 are the acting portions of the pusher 54. It is inserted in 58. Since the base end portion of the needle tip protector 66 is inserted into the input portion 56 having a quadrangular inner peripheral cross-sectional shape and having a small diameter, the needle tip protector 66 is positioned in the direction perpendicular to the axis with respect to the pusher 54. It is designed to prevent rattling and misalignment. Further, since the tip portion of the needle tip protector 66 is housed in the working portion 58 having a wide internal space, the pair of needle tip protection portions 72a and 72b are held in the pusher 54 in a state where they are separated from each other in the initial shape. It is contained.

While the needle tip protector 66 is housed in the protector accommodating portion 55 of the pusher 54 inside the outer needle hub 36, the second portions 78a and 78b of the pair of needle tip protection portions 72a and 72b and the pusher 54 are hit. The tangent portion 60 is arranged at an overlapping position in the projection in the needle axis direction. In other words, the vertical outer ends of the pair of needle tip protection portions 72a and 72b (the boundary portion between the second portion 78 and the third portion 80) are up and down with respect to the vertical inner end of the contact portion 60. It is located outside the direction.

The inner needle unit 12 and the indwelling needle 16 are combined with each other to form the indwelling needle assembly 10. That is, the inner needle 14 is inserted into the indwelling needle 16 from the proximal end side, and penetrates the indwelling needle 16 so that the needle tip 22 protrudes from the tip opening of the outer needle 18. The inner needle hub 20 of the inner needle unit 12 is abutted from the base end side in the axial direction with respect to the base end surface of the outer needle hub 36, whereby the amount of protrusion of the inner needle 14 from the outer needle 18 to the tip is increased. It is stipulated.

The inner needle 14 penetrates the needle tip protector 66. That is, the inner needle 14 inserted from the proximal end side with respect to the indwelling needle 16 has a first circular hole 70 of the first needle insertion portion 68 of the needle tip protector 66 and a second circular hole 94 of the second needle insertion portion 92. And penetrates between the folded portions 82a and 82b of the pair of needle tip protection portions 72a and 72b toward the tip side. By inserting the inner needle 14 into the first circular hole 70 of the first needle insertion portion 68 and the second circular hole 94 of the second needle insertion portion 92, the needle tip protector 66 moves in the direction perpendicular to the axis of the inner needle 14. It is positioned with respect to the needle tip protector 66 with limited movement and tilt. The pair of needle tip protection portions 72a and 72b are separated from the inner needle 14 in the vertical direction in the initial shape of the needle tip protector 66 on which no external force is applied, and are separated from the needle tip protector 66 of the inner needle 14 in the vertical direction. When moving in the axial direction, the inner needle 14 can move smoothly without causing frictional resistance due to contact between the inner needle 14 and the pair of needle tip protection portions 72a, 72b (folded portions 82a, 82b). Further, since the pair of needle tip protection portions 72a and 72b are arranged at a separation distance larger than the vertical width dimension of the inner needle 14 in the initial shape, the inner needle 14 is placed from the base end side with respect to the needle tip protector 66. When inserting, it is not necessary to spread between the pair of needle tip protection portions 72a and 72b, and the insertion work of the inner needle 14 is facilitated.

In the indwelling needle assembly 10 having such a structure, the indwelling needle 16 is moved to the blood vessel by pulling out the inner needle 14 from the outer needle 18 after the inner needle 14 and the outer needle 18 are punctured into the blood vessel of the patient. It is indwelled in a punctured state.

The needle tip 22 of the inner needle 14 pulled out from the outer needle 18 is protected by the needle tip protector 66. That is, as shown in FIG. 10, the needle tip 22 of the inner needle 14 pulled out from the outer needle 18 moves between the pair of needle tip protection portions 72a and 72b of the needle tip protector 66. Then, the locking projections 26 and 26 of the inner needle 14 are axially locked with respect to the first needle insertion portion 68. In the inner needle 14, the needle tip 22 is located on the tip side of the second needle insertion portion 92 and is kept in the inserted state without coming out of the second circular hole 94, so that the runout of the needle tip 22 is suppressed. There is.

When the inner needle 14 is further pulled out toward the base end, the needle tip protector 66 moves toward the base end side together with the inner needle 14, and the needle tip protector 66 passes through the input portion 56 of the pusher 54. When the needle tip protector 66 passes through the input portion 56, the second portions 78a and 78b of the pair of needle tip protection portions 72a and 72b abut on the contact portion 60 of the pusher 54, and the pair of needle tip protection portions The elastic plate portions 74a and 74b of 72a and 72b are deformed and approach each other. As a result, the needle tip protection portion 72b is pressed against the locking pieces 86, 86 by the needle tip protection portion 72a. Since the locking pieces 86, 86 are inclined inward in the width direction toward the needle tip protection portion 72a, the locking pieces 86, 86 are locked by being pressed against the locking pieces 86, 86 by the needle tip protection portion 72a. A force that pushes the pieces 86 and 86 apart from each other acts on the pieces 86 and 86. As a result, the side wall portions 84, 84 supporting the locking pieces 86, 86 are elastically deformed, the space between the locking pieces 86, 86 is expanded, and the needle tip protection portion 72b is between the locking pieces 86, 86. It moves to the needle tip protection portion 72a side from the locking pieces 86, 86 (see FIGS. 11 and 12).

The locking pieces 86, 86 return to their initial positions due to the elasticity of the side wall portions 84, 84 when the force to push them out through the needle tip protection portion 72b is released. Then, both ends of the needle tip protection portion 72b in the width direction are locked to the locking pieces 86, 86, and the needle tip protection portion 72a and the needle do not pass between the locking pieces 86, 86 again. The pre-protection portion 72b is held at an approaching position close to each other. As described above, in the present embodiment, the needle tip protection portion 72a and the needle tip protection portion 72b are locked by locking the elastic plate portion 74b of the needle tip protection portion 72b and the locking pieces 86, 86 of the needle tip protection portion 72a. A holding mechanism for holding the needles in close proximity to each other is configured. Therefore, in the present embodiment, the locking pieces 86, 86 of the needle tip protection portion 72a and the widthwise end portion of the elastic plate portion 74b of the needle tip protection portion 72b are regarded as locking portions that are mutually locked. The holding mechanism is configured by the locking portion. The holding mechanism is integrally provided on the needle tip protector 66. When the needle tip protection portion 72a and the needle tip protection portion 72b are displaced in the approaching direction, the urging force may be generated in the approaching direction, or conversely, the urging force may be generated in the separating direction. It may be good, or it may be possible to prevent the force from being generated. Further, the needle tip protection portion is not limited to the structure of the embodiment, and a needle tip protection portion having a known structure can be appropriately selected and adopted.

The tip portion of the needle tip protection portion 72b that has moved to a position closer to the needle tip protection portion 72a by pulling out the inner needle 14 covers the needle tip 22 of the inner needle 14 on the tip side. In short, the tip portion of the needle tip protection portion 72b that has moved to the approach position shown in FIG. 11 is located on the extension line toward the tip side of the inner needle 14. As a result, even if a force that pushes the inner needle unit 12 toward the tip side acts, the inner needle 14 does not penetrate the needle tip protector 66 and re-project toward the tip side, and the used inner needle 14 is erroneously used. Will not be punctured. In this way, the needle tip protection portions 72a and 72b are designed to protect the needle tip 22 of the inner needle 14 at an approaching position close to each other, and the approaching position of the needle tip protection portions 72a and 72b is the needle tip 22. It is said to be a protective position to protect. Since the needle tip protection portions 72a and 72b of the present embodiment are provided with folded portions 82a and 82b at the tip portions, even if the needle tip 22 moves along the elastic plate portions 74a and 74b, the needle tip 22 Is received by the folded- back portions 82a and 82b, so that the movement is restricted and the needle tip 22 does not re-protrude.

The side wall portions 84, 84 of the needle tip protection portion 72a at the protection position are arranged on both the left and right sides with respect to the needle tip 22 of the inner needle 14, and the needle tip 22 is exposed to the tip side by the elastic plate portions 74a, 74b. It is prevented not only on both the upper and lower sides but also on both the left and right sides. In short, in a state where the needle tip protection portions 72a and 72b move to the protective position to protect the needle tip 22, the tip portion of the needle tip protector 66 has a bag shape, and the needle tip 22 has the bag-shaped tip portion. The outer peripheral side and the tip side of the needle tip 22 are both covered with the needle tip protector 66. Therefore, even if the needle tip 22 swings in the vertical direction or the horizontal direction, the movement of the needle tip 22 stays in the bag-shaped tip portion of the needle tip protector 66, and the needle tip 22 touches the patient or the medical staff. Can be prevented.

The pair of needle tip protection portions 72a and 72b of the needle tip protector 66 are closed close to each other by contacting the stepped portion (contact portion 60) of the pusher 54 from the initial position separated from each other. The needle tip 22 may be covered by being deformed to a position. For example, by locking a pair of needle tip protection portions 72a and 72b elastically held to the initial position in a closed position, the needle tip 22 may be covered. Elastic restoration to the initial position may be prevented. Preferably, for example, the base end portions of the pair of needle tip protection portions 72a and 72b are provided with spring characteristics as a curved cross-sectional shape, so that the initial position separated from each other and the protected position closed close to each other are preferably used. At the boundary position, the initial position and the protection position are selectively elastically deformed, and the shape is stably maintained in either the initial position or the protection position. However, in order to prevent re-exposure of the needle tip by intentionally or unintentionally expanding the pair of needle tip protection portions 72a, 72b of the needle tip protector 66 that was closed when the inner needle 14 was pulled out, the pair of needle tip protection Even when the shapes of the portions 72a and 72b are maintained in the protective position, it is desirable to provide a locking mechanism for preventing the pair of needle tip protection portions 72a and 72b from being deformed in the direction of mutual separation.

The inner needle 14 whose needle tip 22 is protected by the needle tip protector 66 is pulled out toward the proximal end side with respect to the outer needle hub 36 and is separated from the outer needle hub 36 as shown in FIG. Since the holding mechanism is provided on the needle tip protection portions 72a and 72b of the needle tip protector 66, even if the needle tip protector 66 is separated from the outer needle hub 36, the needle tip protection portions 72a and 72b are close to each other. It is held in the protected position and the needle tip 22 is protected by the needle tip protector 66. As described above, since the holding mechanism for holding the needle tip protection portions 72a and 72b at the protective position is provided on the needle tip protector 66 itself, the needle tip protection portion of the needle tip protector 66 separated from the outer needle hub 36 is provided. It is not necessary to separately provide another part such as a ring for holding the 72a and 72b in the protective position with respect to the outer needle hub 36. The needle tip protector 66 may be accommodated in a close state and a guide portion may be provided to guide the needle tip protector 66 so that the needle tip protector 66 can be smoothly pulled out when the needle tip protector 66 is separated from the outer needle hub 36. The guide portion may be, for example, the contact portion 60 of the pusher 54, but for example, by being provided in a state in which the guide portion can be guided to the needle tip protector 66, the guide portion abuts on the needle tip protector 66. It does not have to be.

The indwelling needle 16 separated from the inner needle unit 12 is indwelled with the outer needle 18 punctured into the blood vessel of the patient. In the indwelling needle 16, for example, an infusion line, a connector, a syringe, or the like (not shown) is connected to the base end portion of the outer needle hub 36. The male luer of the connector or syringe connected to the outer needle hub 36 is inserted into the luer insertion portion 50 of the outer needle hub 36 and pressed against the base end of the input portion 56 of the pusher 54 to the input portion 56. An external force that moves the pusher 54 toward the tip side is applied, and the pusher 54 is pushed toward the tip end. Then, as the pusher 54 moves toward the tip end side, the acting portion 58 of the pusher 54 is pressed against the valve body 62. As a result, the valve body 62 is elastically deformed, the slit 64 of the valve body 62 is pushed open, and the inside of the patient's blood vessel and the infusion line, the syringe, etc. are communicated with each other through the opened slit 64, and the indwelling needle 16 is used. Infusion and medication are possible through.

In the pusher 54 of the present embodiment, the outer peripheral end of the acting portion 58 is located outside the outer peripheral end of the slit 64, and the outer peripheral portion of the valve body 62 is inserted without the acting portion 58 being inserted into the slit 64. Press. Therefore, for example, when the infusion line or syringe is removed from the outer needle hub 36 and the pusher 54 is released from being pushed by the male luer, the pusher 54 is based on the elastic restoring force of the valve body 62. It moves to the end side, and the closing operation of the valve body 62 is realized. As a result, the valve body 62 can be stably opened and closed in the indwelling needle 16 which can be used frequently in the indwelling state.

14 and 15 show a part of the indwelling needle assembly 100 as the second embodiment of the present invention. In the following description, the members and parts substantially the same as those in the first embodiment are designated by the same reference numerals in the drawings, and the description thereof will be omitted. Further, in the indwelling needle assembly 100 of the present embodiment, the portions not shown in FIGS. 14 to 18 are the same as those of the first embodiment.

The indwelling needle assembly 100 includes a pusher 102. As shown in FIGS. 16 to 18, the pusher 102 has a small-diameter cylindrical input portion 56 having a cylindrical outer peripheral surface and an inner peripheral surface having a square cross section at the base end portion, and the tip portion is a cylinder. Is a flat cylindrical working portion 104 that is crushed by a predetermined amount in a direction perpendicular to a specific axis (left-right direction in FIG. 18). The working portion 104 has a substantially oval inner shape and an outer shape in which the left-right direction is the short axis direction and the vertical direction is the long axis direction. As a result, the pusher 102 has a flat shape in which the opening portion at the tip formed by the acting portion 104 has a minimum portion and a maximum portion having a diameter dimension set in two orthogonal directions. As a result, in the protector accommodating portion 55 formed inside the pusher 102, the tip portion of the wall portion formed by the working portion 104 has an internal dimension in the vertical direction larger than the internal dimension in the horizontal direction. It has a flat shape. The outer peripheral surface of the working portion 104 in the minor axis direction is a plane extending substantially orthogonal to the minor axis direction. The outer peripheral surface of the working portion 104 in the major axis direction is a curved surface that curves in an arc shape in the circumferential direction. The inner peripheral surface of the working portion 104 has a cross-sectional shape corresponding to the outer peripheral surface, and the width dimension in the minor axis direction is substantially the same as the width dimension in the same direction of the input portion 56. The flat shape of the tip opening portion of the pusher 102 is not limited to an elliptical shape or an oval shape as illustrated, and may be, for example, a rectangular tubular shape.

A pair of insertion protrusions 106, 106 are formed on the tip surface of the working portion 104. The insertion protrusions 106 are provided on both sides of the working portion 104 in the flat direction (minor axis direction), respectively. The cross-sectional shape of the insertion protrusion 106 is not particularly limited, but has a shape and dimensions that can be inserted into the slit 64 of the valve body 62, and is preferably a width in the vertical direction which is the opening / closing direction of the slit 64 of the valve body 62. The dimension is made larger than the width dimension in the left-right direction. The insertion protrusion 106 of the present embodiment extends in the axial direction in a substantially oval cross section in which both end surfaces in the vertical direction are curved surfaces, and the vertical direction which is the opening / closing direction of the slit 64 in the vertical cross section is the long axis direction. It is said that. The tip surface of the insertion protrusion 106 is a flat surface that extends orthogonally to the axial direction. For example, in order to improve the ease of insertion into the slit 64, the tip surface is tapered in the vertical direction toward the tip. It may be a shape or the like. Each insertion protrusion 106 is arranged in the radial direction on the tip surface of the action portion 104 so that the separation distance becomes small, so that a predetermined portion of the valve body 62 can be strongly pressed. In addition, each insertion protrusion 106 may be provided above and below (up and down in FIG. 16) the tip surface of the action portion 104 where the separation distance becomes large. The number of insertion protrusions 106 may be only one instead of a plurality. The insertion protrusion 106 may not be provided. The insertion protrusion 106 may be continuously provided on the inner edge of the tip surface of the action portion 104 in a circumferential shape so that the inside of the valve body 62 in contact with the tip surface of the action portion 104 is displaced more greatly.

As shown in FIGS. 14 and 15, the pusher 102 is housed inside the outer needle hub 36, and the needle tip protector 66 is housed inside. Since the needle tip protector 66 has a second portion 78a, 78b in which the needle tip protection portions 72a, 72b are inclined up and down and outward toward the tip in the initial shape before protecting the needle tip 22, the needle tip protector 66 has a needle tip. The outer dimensions are larger than those in the left-right direction in the vertical direction, which is the direction in which the protective portions 72a and 72b face each other. Therefore, by accommodating the tip portion of the needle tip protector 66 in the protector accommodating portion 55 of the acting portion 104 flattened in the left-right direction, the gap between the needle tip protector 66 and the inner surface of the acting portion 104 is reduced. Will be done. As a result, the pusher 102 provided with the protector accommodating portion 55 and the outer needle hub 36 accommodating the pusher 102 can be miniaturized. In particular, in the left-right direction, which is the flat direction of the working portion 104, miniaturization of the pusher 102 or the like can be easily realized.

Then, when a male luer (not shown) is inserted into the indwelling needle 16 placed in the blood vessel or the like and the pusher 102 is pushed toward the tip side, the pair of insertion protrusions 106 and 106 of the pusher 102 are inserted into the slit 64 of the valve body 62. Is inserted into the slit 64 while spreading. As a result, as virtually shown by the two-dot chain line in FIG. 18, the slit 64 of the valve body 62 is greatly expanded by the insertion protrusions 106 and 106 of the pusher 102, and the slit 64 is opened. Since the insertion protrusion 106 of the present embodiment has a long cross-sectional shape in the vertical direction, the slit 64 can be expanded more and surely opened by being inserted into the slit 64. In FIG. 18, the slit 64 is a single character extending in the left-right direction and is designed to open in the vertical direction, but it may also be a slit extending radially in a plurality of directions such as a Y-shape or a cross.

Further, the portions of the tip surface of the pusher 102 that are out of the insertion protrusions 106 and 106 are pressed against the base end surface of the valve body 62 on the outer periphery of the slit 64. As a result, in the open state of the valve body 62, the valve body 62 is pushed toward the tip side by the pusher 102 and is elastically deformed. Then, when the male lure is removed from the outer needle hub 36 and the external force for pushing the pusher 102 toward the tip end side is released, the pusher 102 is pushed back to the base end side based on the elasticity of the valve body 62. In particular, the acting portion 104 has a larger outer diameter than the input portion 56, and the acting portion 104 presses the outer peripheral side of the valve body 62. The force toward the proximal end is easily transmitted, and the pusher 102 is stably pushed back to the proximal end side. In this way, the pusher 102 moves toward the proximal end due to the elasticity of the valve body 62, so that the insertion protrusions 106, 106 inserted into the slit 64 come out of the slit 64. As a result, the slit 64 is closed and communication between the inside and the outside of the blood vessel is blocked. Therefore, it is possible to prevent the valve body 62 from being opened and closed in response to the attachment / detachment of an infusion line or an external line such as a syringe to the indwelling needle 16 so that the valve body 62 once opened cannot be closed.

FIG. 19 shows a part of the indwelling needle assembly 110 as the third embodiment of the present invention. The indwelling needle assembly 110 includes a pusher 112. In the indwelling needle assembly 110 of the present embodiment, the parts not shown in FIGS. 19 and 20 are the same as those of the first embodiment.

As shown in FIG. 20, the pusher 112 includes a pusher body 114 as a base end member and an opening / closing member 116 as a tip member attached to an opening on the tip end side of the pusher body 114. .. The pusher body 114 and the opening / closing member 116 are independently formed as separate members, and for example, the pusher 112 is formed by being fixed to each other by means such as adhesion, welding, fitting, and caulking. There is. The pusher main body 114 has the same structure as the pusher 54 of the first embodiment, and includes an input unit 56 and an action unit 58.

The opening / closing member 116 includes a substantially disk-shaped mounting portion 118 having substantially the same outer diameter as the working portion 58, and the mounting portion 118 covers the tip opening of the pusher main body 114. The opening / closing member 116 is provided with a through hole 120 that penetrates the central portion in the thickness direction, and is an insertion cylinder portion 122 as an insertion portion in which the opening peripheral portion of the through hole 120 projects from the mounting portion 118 toward the tip end. ing. The insertion cylinder portion 122 has a substantially cylindrical shape having a smaller diameter than the mounting portion 118, and can be inserted into the slit 64 of the valve body 62. The insertion cylinder portion 122 of the present embodiment has a cylindrical shape extending with a substantially constant outer diameter, but for example, the insertion cylinder portion is moved to the tip thereof in order to make it easier to insert and remove from the slit 64. It can also be a tapered cylinder that tapers toward it.

As shown in FIG. 19, the pusher 112 is housed inside the outer needle hub 36, and the needle tip protector 66 is housed inside. Then, when a male luer (not shown) is inserted into the indwelling needle 16 and the pusher 112 is pushed toward the tip side, the insertion tube portion 122 provided at the tip of the pusher 112 inserts the slit 64 of the valve body 62. It is inserted into the slit 64 while being pushed open. As a result, the slit 64 of the valve body 62 is expanded by the insertion cylinder portion 122 of the pusher 112, and the slit 64 is opened.

Further, the tip surface of the mounting portion 118 deviating from the insertion cylinder portion 122 to the outer periphery is pressed against the base end surface of the valve body 62 on the outer periphery rather than the slit 64. As a result, the valve body 62 in the open state is pushed toward the tip side by the pusher 112 and is elastically deformed. Then, when the male lure is removed from the outer needle hub 36 and the external force for pushing the pusher 112 toward the tip end side is released, the pusher 112 is pushed back to the base end side based on the elasticity of the valve body 62. In this way, the pusher 112 moves toward the proximal end due to the elasticity of the valve body 62, so that the insertion cylinder portion 122 inserted into the slit 64 comes out of the slit 64. As a result, the slit 64 is closed and communication between the inside and the outside of the blood vessel is blocked. Therefore, it is possible to prevent the valve body 62 from being opened and closed in response to the attachment / detachment of an infusion line or an external line such as a syringe to the indwelling needle 16 so that the valve body 62 once opened cannot be closed.

Since the pusher 112 has a structure in which two parts of the pusher body 114 and the opening / closing member 116 are combined, the performance required for the base end portion of the pusher 112 and the tip portion of the pusher 112 are required. Performance can be achieved to a high degree. For example, if the pusher 112 according to the present embodiment is adopted, the pusher main body 114 constituting the base end portion of the pusher 112 secures the internal space required for accommodating the needle tip protector 66, and the pusher. The opening / closing member 116 constituting the tip portion of the 112 can stably realize the opening operation of the slit 64 of the valve body 62.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited by the specific description thereof. For example, in the above embodiment, the holding mechanism is configured by locking the locking pieces 86, 86 in which the needle tip protection portions 72a, 72b project from the side wall portions 84, 84 and the side edge portions of the elastic plate portion 74b. However, the position where the holding mechanism is provided is not particularly limited. Specifically, for example, the holding mechanism can be configured by engaging the tip of the needle tip protection portion 72b with the folded-back portion 82a of the needle tip protection portion 72a. Further, for example, a holding mechanism can be configured by providing a locking structure between the needle tip protection portions 72a and 72b and the positioning portion 88.

In the above embodiment, the contact portion 60 for shifting the needle tip protector 66 to the needle tip protection state is provided in a stepped shape protruding inward from the action portion 58 of the pusher 54. For example, the pusher 54 is provided. It may be a ridge that further protrudes from the input portion 56 of the above to the inner circumference.

Further, the contact portion 60 does not necessarily have to be provided on the pusher 54. For example, a notch is formed on the base end side of the pusher 54, and the contact portion 60 is placed on the inner peripheral surface of the outer needle hub 36. It can also be provided. When the contact portion 60 is provided on the inner peripheral surface of the outer needle hub 36, for example, a contact portion that protrudes inward in the radial direction may be formed on the inner surface of the lure connecting member, and is separate from the luer connecting member. The contact portion may be realized by assembling the member of the above to the luer connecting member. Further, the contact portion may not be provided.

When the pushers 54, 102, 112 of the first to third embodiments are adopted, the structure of the needle tip protector 66 is not limited, and needle tip protectors having various known structures may be adopted in combination. can. Further, even when the needle tip protector 66 is not provided or the needle tip protector 66 is not housed in the pusher 54, 102, 112, the pusher 54, 102, 112 of the above embodiment can be adopted.

The pusher 112 of the third embodiment has a two-part configuration in which a pusher main body 114 as a base end member and an opening / closing member 116 as a tip end member are combined. For example, the pusher main body. The pusher may be composed of three or more parts, for example, the working part 58 and the input part 56 of the 114 are made into separate parts.

In the above embodiment, the needle tip protector is housed inside the pusher, but parts other than the needle tip protector may be housed inside the pusher. Specifically, for example, a coil spring extrapolated to the needle tip protector can be arranged inside the acting portion of the pusher. According to this, for example, when the inner needle is pulled out, the tip portion of the needle tip protector passes through the inner circumference of the coil spring, and the needle tip protection portion of the needle tip protector can be moved to the protected position. Further, if the coil spring is compressed when the pusher is pressed against the valve body, the pusher is moved to the base end side by the elasticity of the coil spring when the force for pushing the pusher is released. Therefore, the valve body can be quickly moved to the closed state.

When the needle tip protector is housed inside the pusher, the entire needle tip protector does not necessarily have to be housed inside the pusher. For example, the needle tip protector may be partially housed inside the pusher, for example, the tip portion of the needle tip protector is housed inside the pusher and the base end portion is exposed to the base end rather than the pusher. ,

The working part of the pusher has not only the inner diameter but also the outer diameter larger than the input part. For example, the working part may have an inner diameter larger than the input part and the outer diameter the same as the input part. ..

10 Indwelling needle assembly (first embodiment)
12 Inner needle unit 14 Inner needle 16 Indwelling needle 18 Outer needle 20 Inner needle hub 22 Needle tip 26 Locking protrusion 28 Hub body 30 Inner needle holding part 32 Taper-shaped part 34 Cap member 35 Breathable filter 36 Outer needle hub 38 Needle fixation Member 40 Lure connecting member 42 Taper part 44 Engagement hole 46 Step 48 Hub connecting part 50 Lure insertion part 52 Engagement claw 54 Pusher 55 Protector accommodating part 56 Input part (small cylinder part)
58 Acting part (large cylinder part)
60 Contact part 62 Valve body 64 Slit 66 Needle tip protector 68 First needle insertion part 70 First circular hole 72 Needle tip protection part 74 Elastic plate part 76 First part 78 Second part 80 Second part 80 Third part 82 Folded part 84 Side wall Part 85 Notch 86 Locking piece 88 Positioning part 90 Support part 92 Second needle insertion part 94 Second circular hole 100 Indwelling needle assembly (second embodiment)
102 Pusher 104 Acting part 106 Insertion protruding part 110 Indwelling needle assembly (third embodiment)
112 Pusher 114 Pusher body (base member)
116 Opening and closing member (tip member)
118 Mounting part 120 Through hole 122 Insertion cylinder part

Claims (7)

1. An inner needle having an inner needle hub on the proximal end side is inserted into an outer needle having an outer needle hub on the proximal end side so as to be retractable, and protects the needle tip of the inner needle pulled out from the outer needle. An indwelling needle assembly with a needle tip protector
   The needle tip protector has a needle tip protection portion located laterally away from the inner needle.
   When the inner needle was pulled out from the outer needle, the needle was pulled out by stopping at the outer needle hub, contacting the needle tip protection portion, and displacing the needle tip protection portion toward the inner needle. It is equipped with a contact part that leads to a protective position that covers the needle tip of the inner needle, and also has a contact part.
   An indwelling needle assembly in which a pusher for switching the valve body is arranged on the proximal end side of the valve body inside the outer needle hub, and at least a part of the needle tip protector is housed inside the pusher. ..
2. An inner needle having an inner needle hub on the proximal end side is inserted into an outer needle having an outer needle hub on the proximal end side so as to be retractable, and a pusher for switching the valve body inside the outer needle hub is the valve. An indwelling needle assembly placed on the base end side of the body,
   At least a part of the needle tip protector that protects the needle tip of the inner needle pulled out from the outer needle is housed inside the pusher.
   The pusher has a small cylinder portion and a large cylinder portion, and the pusher has a small cylinder portion and a large cylinder portion.
   An indwelling needle assembly in which the large cylinder portion is formed on the tip side of the small cylinder portion, and the large cylinder portion has a larger internal dimension than the small cylinder portion.
3. An inner needle having an inner needle hub on the proximal end side is inserted into an outer needle having an outer needle hub on the proximal end side so as to be retractable, and a pusher for switching the valve body inside the outer needle hub is the valve. An indwelling needle assembly placed on the base end side of the body,
   At least a part of the needle tip protector that protects the needle tip of the inner needle pulled out from the outer needle is housed inside the pusher.
   The pusher includes an input portion to which an external force for pressing the pusher against the valve body is input, and an action portion provided on the tip side of the input portion to push the valve body open.
   An indwelling needle assembly in which the working portion has a larger diameter than the input portion.
4. The valve body is formed with a slit that penetrates the inner peripheral portion in the needle axis direction of the inner needle.
   The indwelling needle assembly according to claim 3, wherein the outer peripheral end of the working portion is located on the outer periphery of the outer peripheral end of the slit.
5. An inner needle having an inner needle hub on the proximal end side is inserted into an outer needle having an outer needle hub on the proximal end side so as to be retractable, and a pusher for switching the valve body inside the outer needle hub is the valve. An indwelling needle assembly placed on the base end side of the body,
   At least a part of the needle tip protector that protects the needle tip of the inner needle pulled out from the outer needle is housed inside the pusher.
   The pusher includes a tip member attached to an opening on the tip side of the base member.
   An indwelling needle assembly in which at least a part of the opening on the distal end side of the proximal end member is closed by the distal end member.
6. An inner needle having an inner needle hub on the proximal end side is inserted into an outer needle having an outer needle hub on the proximal end side so as to be retractable, and a pusher for switching the valve body inside the outer needle hub is the valve. An indwelling needle assembly placed on the base end side of the body,
   It is equipped with a needle tip protector that protects the needle tip of the inner needle pulled out from the outer needle.
   The opening at the tip of the pusher has a flat cylindrical shape, and at the same time,
   An indwelling needle assembly provided with a protector accommodating portion for accommodating at least a part of the needle tip protector inside the pusher having a flat tubular shape.
7. The indwelling needle assembly according to claim 6, wherein the pusher is provided with an insertion protrusion that protrudes toward the tip on both sides in the flat direction and can be inserted into a slit formed in the valve body.

Images