JP5136855B2 - Needle tip protector and indwelling needle assembly - Google Patents

Description

  The present invention relates to a protector for protecting a needle tip used for protecting a needle tip of a needle, and an indwelling needle assembly that is punctured and placed in a blood vessel at the time of infusion or blood collection.

  When performing infusion or blood collection on a patient or the like, generally, an injection needle attached to the tip of a syringe, a needle attached to the tip of a tube connected to a container for infusion or blood collection, or a patient An indwelling needle or the like inserted through a hollow resin needle placed in a blood vessel such as the like is used. Each of these needles has a sharp needle tip. For this reason, after use, there is a possibility that a doctor, a nurse, a needle discarder, or the like erroneously punctures a finger or the like with the needle tip. When such an accident occurs, there is a risk of causing infection by blood adhering to the needle tip.

  Therefore, in recent years, in order to prevent the occurrence of an accidental puncture accident, when removing the needle from a patient or the like, a needle tip protection protector that covers and protects the needle tip so as not to be exposed to the outside is attached. The needle has begun to spread.

  For example, the protector for protecting the needle tip includes a protector main body having an insertion hole through which the needle is inserted, and a plurality of elastic fingers provided on the protector main body so as to extend toward the needle tip side. The tip of each elastic finger is slidable with respect to the outer peripheral surface of the needle inserted through the insertion hole of the protector body while the plurality of elastic fingers are elastically deformed laterally away from the needle. Is attached to the needle (see, for example, Patent Document 1 below). When a needle equipped with such a protector is removed from a patient or the like, the needle moves relative to the protector while sliding on the tip portions of the plurality of elastic fingers. Then, when the needle tip is positioned between the plurality of elastic fingers by such movement of the needle, each of the elastic fingers is restored from the elastically deformed state. As a result, the needle tip is covered and protected by the plurality of fingers.

  Further, as another protector for protecting the needle tip, a support plate portion provided with an insertion hole through which the needle is inserted, and a protection portion that extends from the support plate portion toward the needle tip side and can cover the needle tip at the tip portion It is made up of an elastic spring clip that integrally has an extension plate part provided with a slidable on the outer peripheral surface of the needle in a state where the extension plate part is elastically deformed laterally away from the needle. Also known are those that come into contact and are attached to a needle (see, for example, Patent Documents 2 and 3 below). When the needle with the protector attached is removed from the patient or the like, the needle moves relative to the protector while sliding on the extension plate. When the contact state between the needle and the extension plate portion is released by the movement of the needle, the extension plate portion is restored from the elastically deformed state. Thereby, the needle tip is covered and protected by the protection portion at the tip of the extension plate portion.

  Thus, when using a needle to which a conventional protector for protecting the needle tip is used, the needle tip is protected without performing a special operation for protecting the needle tip when the needle is removed from the patient or the like. It can be done.

  However, all of these conventional needle tip protecting protectors are attached to the needle with the elastically deformed portion in contact with the outer peripheral surface of the needle. Therefore, when the needle with such a protector is moved relative to the protector and removed from the patient or the like, the sliding resistance of the needle with respect to the protector increases, which is necessary to protect the needle tip. An increase in power was inevitable. When the force necessary for protecting the needle tip increases, it becomes difficult to carry out the needle tip protection operation with one hand, thereby making it difficult to protect the needle tip immediately after the removal of the inner needle, or There is a possibility that it may be difficult to reliably move the needle relative to the protector to a position where the needle tip is protected.

JP-A-9-99073 Japanese Patent Laid-Open No. 2001-514943 JP 2002-248168 A

  Under such circumstances, the applicant of the present application previously proposed a protector for protecting the needle tip in which the problem of increase in sliding resistance between the protector and the needle as described above was advantageously solved in Japanese Patent Application No. 2007-808015. In addition, in Japanese Patent Application No. 2007-171427, an indwelling needle assembly having such a needle tip protecting protector was proposed.

  That is, the previously proposed protector for protecting the needle tip has (a) an insertion portion through which the needle is inserted, and the needle is inserted into the insertion portion so that it can move in the needle axis direction with respect to the needle. And a protector body mounted in a state extending in the needle axis direction, and (b) extending toward the needle tip side at the side of the needle inserted through the insertion portion, and bending in a direction in which the tip portion approaches the needle. A flexible side plate provided on the protector body so that it can be deformed, and (c) with the protector body moved to the needle tip side of the needle inserted through the insertion portion, the flexible side plate uses the tip as a needle. A protective part provided at the tip of the flexible side plate that protects the needle tip when located in a protective position that covers the needle tip when bent and deformed in the approaching direction; and (d) the protector body, The tip side of the protector body that is extrapolated movably in the needle axis direction and becomes the needle tip side The movement of the flexible side plates, by flexural deformation in a direction in which the distal end approaches the needle is configured to include a working ring to position the protecting portion to the protecting position. In addition, the bending deformation said in this specification includes both the bending deformation accompanied by an elastic deformation, and the bending deformation not accompanied by an elastic deformation.

  The protector for protecting the needle tip having such a structure is different from the protector having the conventional structure described above so that the elastically deformed portion comes into contact with the outer peripheral surface of the needle when the protector is attached to the needle. Therefore, when the needle and the protector attached thereto are moved relative to each other, the generation of a large sliding resistance between the outer peripheral surface of the needle and the protector portion in contact with the needle is eliminated. Therefore, the protection of the needle tip can be performed immediately and reliably after the needle is removed from the patient or the like with a smaller force.

  However, as a result of further studies on the structure of the protector for protecting the needle tip that exhibits this excellent feature from various angles, the present protector for protecting the needle tip should be improved as follows. It turns out that I still have.

  That is, in the previously proposed protector for protecting the needle tip, in order to maintain the protection state of the needle tip by the protection portion, the working ring moved to the tip side of the protector main body to bend and deform the flexible side plate is used. It is necessary to stop the protective portion at a position where the protective portion is maintained in the protected position without coming out of the main body. Therefore, such a needle tip protecting protector is provided with an engaging protrusion that engages with the front end face located on the forward side of the action ring and prevents the action ring from being pulled out from the distal end side of the protector body. . However, this engaging protrusion is integrally formed on a flexible side plate that bends and deforms as the action ring moves. Therefore, the protrusion angle of the engaging protrusion with respect to the central axis of the protector body inevitably changes according to the amount of bending deformation and the bending angle of the flexible side plate. Therefore, depending on the amount of bending deformation and the bending angle of the flexible side plate, it may be difficult to ensure stable engagement between the engaging protrusion and the action ring. Therefore, it is necessary to devise another device for protecting the needle tip previously proposed in order to stably maintain the protection state after the needle tip is protected by the protection unit.

  Further, in such a protector for protecting the needle tip, the protector protects the protector in a state where the base end side portion of the needle tip is sandwiched between the flexible side plate and the opposite side plate facing the flexible side plate. Arranged inside the body. For this reason, if the needle tip is unintentionally moved back and the needle tip is positioned between the flexible side plate and the opposite side plate and the needle tip is shaken, However, there is also a concern that a situation may occur in which the flexible side plate and the opposite side plate jump out in a direction perpendicular to the opposing direction.

  Therefore, according to the present invention, the protection of the needle tip can be carried out immediately and reliably after the removal of the needle from the patient with a smaller force, and the protection state of the needle tip can be maintained even more stably. It is an object of the present invention to provide an improved needle tip protector structure. It is another object of the present invention to provide an indwelling needle assembly improved by providing such a needle tip protection protector so that the needle tip can be more reliably protected.

  The present invention can be suitably implemented in various aspects as listed below in order to solve the problems described above or the problems grasped from the description and drawings of the entire specification. In addition, each aspect described below can be adopted in any combination, and the aspect or technical features of the present invention are not limited to those described below. It should be understood that the invention can be recognized based on the inventive concept disclosed in the description and the drawings.

<1> A protector body attached to the needle so as to be movable in the needle axis direction and extending in the needle axis direction, and an action ring extrapolated to the protector body so as to be movable in the needle axis direction The protector body has (a) a first insertion hole through which the needle is inserted, and extends on the proximal end side of the protector body so as to cross the needle axis direction of the needle. And (b) a pair of side edge portions located on both sides of the first insertion hole of the base end side base plate, with a predetermined distance from each other. In a state of being arranged, the distance between the opposing surfaces is integrally formed with the base end side bottom plate so as to extend toward the needle tip side of the needle inserted through the first insertion hole. Are gradually increased toward the needle tip side of the needle, and can be bent and deformed in the direction of mutual approach. A pair of flexible side plates, and (c) the pair of flexible side plates in the direction of mutual approach in a state where the protector body has moved to the needle tip side of the needle inserted through the first insertion hole. Protective portion provided at the tip of at least one of the pair of flexible side plates that protects the needle tip by being positioned at a protective position that covers the needle tip of the needle when it is bent and deformed And (d) a pair of parallel side plates facing each other in a direction perpendicular to the opposing direction of the pair of flexible side plates and extending in parallel with the needle axis direction of the needle inserted through the first insertion hole, e) having a second insertion hole through which a portion closer to the needle tip side than the insertion portion to the first insertion hole in the needle is inserted, and at the distal end side of the protector body, the pair of parallel side plates One of the leading edges is extended toward one of them. (F) a space surrounded by the distal end side bottom plate, the base end side bottom plate, the pair of flexible side plates, and the pair of parallel side plates, An accommodating portion for accommodating a part of the needle inserted through the first insertion hole of the side bottom plate and the second insertion hole of the base end side bottom plate; and (g) an edge of the distal end side bottom plate Engaging protrusions integrally formed on the front end side bottom plate so as to protrude outward from the outer surface of at least one side plate of the pair of parallel side plates and the pair of flexible side plates. Along with the forward movement of the action ring toward the distal end side of the protector body, the pair of flexible side plates are pressed inward in the opposing direction by the action ring and bent in the approaching direction. As a result, the protective part is positioned at the protective position and the action The front end surface located on the forward movement side of the front end of the group is engaged with the engagement protrusion of the front end side bottom plate, thereby preventing the action ring from being pulled out from the front end side of the protector body. A protector for protecting the needle tip.

<2> The protector for protecting the needle tip according to the above aspect <1>, wherein the flexible side plate has elasticity.

<3> The intermediate portion of each of the pair of flexible side plates in the extending direction is bent in a direction in which the tip side portion is separated from the needle inserted through the first and second insertion holes. A bending portion is provided, and the distance between the opposing surfaces is gradually increased as the tip side portion of the pair of flexible side plates is bent toward the needle tip side of the needle, so that the mutual approaching direction is increased. And a flexible piece portion that can be bent and deformed in parallel, while the base end side portions of the pair of flexible side plates extend parallel to each other in the needle axis direction of the needle. Furthermore, a stopper mechanism is provided for the pair of parallel extending portions, and a stopper mechanism for preventing the parallel extending portions from bending and deforming in the approaching direction of the pair of flexible side plates is provided. The parallel side plate has the pair of parallel extending portions at each base end portion. Needle tip protector according to the above aspect <1> or <2>, which are integrally connected.

<4> With respect to at least one of the pair of parallel extending portions, a stopper plate portion extending toward at least one of the two is integrally formed. A stopper mechanism is configured, and the stopper plate part abuts on a parallel extension part different from the parallel extension part on which the stopper plate part is formed, whereby the pair of parallel extension parts in the approaching direction to each other. The protector for protecting the needle tip according to the above aspect <3>, wherein the deformation of the parallel extending portion is prevented.

<5> The protector for protecting a needle tip according to the above aspect <1> or <2>, wherein the pair of parallel side plates are integrally formed with the base end side bottom plate.

<6> The tip side bottom plate is disposed so as to extend perpendicularly to the needle axis direction of the needle inserted through the first insertion hole and the second insertion hole, and Any one of the above aspects <1> to <5>, in which the engaging protrusion extends from the end edge of the tip side bottom plate in a direction perpendicular to the needle axis direction of the needle. A protector for protecting the needle tip as described in 1.

<7> The first protection plate portion that extends from the distal end portion of the flexible side plate toward the needle tip side of the needle, and the needle tip from the needle tip side end portion of the first plate portion. The needle tip according to any one of the above aspects <1> to <6>, which has a bent plate shape including a second protective plate portion that extends integrally toward the side opposite to the side. Protective protector.

<8> The first protection plate portion of the protection portion so as to cover each side opening portion of the protection portion having a bent shape that opens toward both sides in a direction perpendicular to the needle axis direction of the needle. And the second protective plate portion sandwiched between the two side lid plate portions facing each other in a direction perpendicular to the needle axis direction, wherein the protective portion is further provided with the above aspect < 7> The protector for protecting the needle tip according to 7>.

<9> With respect to at least one of the pair of flexible side plates and the pair of parallel side plates, a retraction preventing claw portion that can be elastically deformed extends toward the front end side of each of the side plates. Although the forward movement of the working ring toward the distal end side of the protector body is allowed by the elastic deformation of the retracting prevention claw portion provided, the working ring moves until the protective portion is positioned at the protective position. The working ring to the proximal end side of the protector body by recovering from the elastically deformed state and contacting the rear end surface of the working ring located on the opposite side of the forward movement direction of the working ring. The needle tip protection protector according to any one of the above aspects <1> to <8>, wherein the backward movement of the needle is prevented.

<10> The above aspect <9>, wherein the retraction preventing claw portion is integrally formed by cutting and raising at least one of the pair of flexible side plates and the pair of parallel side plates. Needle point protector.

<11> The protector for protecting a needle tip according to the above aspect <9> or <10>, in which the retraction preventing claw portion is integrally formed only on at least one of the pair of flexible side plates.

<12> The protector for protecting a needle tip according to any one of the above aspects <1> to <10>, wherein the protector main body is configured as a single body made of one metal plate.

<13> An inner needle hub, an inner needle extending from the distal end of the inner needle hub, an outer needle hub, and a hollow outer needle extending from the distal end of the outer needle hub. A hollow portion communicating with the inner hole of the outer needle is formed in the inside so as to open to the outside through a proximal-side opening provided in a proximal end portion of the outer needle hub. The inner needle hub and the outer needle hub are inserted into the hollow portion through the proximal end side opening of the outer needle hub while the distal end portion of the inner needle hub is inserted through the needle. It is an indwelling needle assembly assembled | attached mutually, Comprising: The protector for needle-tip protection as described in any one of said aspect <1>-<12> is the said protector main body with respect to the said inner needle. It is accommodated in the hollow portion of the outer needle hub so as to be movable in the direction of the needle axis while being mounted so as to be movable in the direction of the needle axis. On the other hand, when the inner needle is pulled out from the outer needle and the inner needle hub is separated from the outer needle hub through the proximal end side opening, the protector is engaged with the protector body, An engagement portion that allows the main body and the inner needle to integrally move toward the proximal end side of the outer needle hub is provided on the inner needle, and further, the protector main body and the inner needle are connected to the outer needle hub. A locking means for locking to the working ring of the needle tip protecting protector and preventing movement of the working ring to the proximal side of the outer needle hub when integrally moving to the proximal end side, Provided in the hollow portion of the outer needle hub, the working ring moves relative to the distal end side of the protector body by integrally moving the protector body and the inner needle to the proximal end side of the outer needle hub. Until the protection part of the flexible side plate is located at the protection position. While the side plate is configured to be bent and deformed, when the protector body and the inner needle are further moved integrally to the proximal end side of the outer needle hub from the state where the protection portion is located at the protection position. Unlocking means for releasing the locking of the locking ring with respect to the working ring and allowing the working ring and the inner needle to move integrally to the proximal end side of the outer needle hub. An indwelling needle assembly characterized by that.

<14> On the inner peripheral surface of the hollow portion of the outer needle hub, a concave groove that is engaged with the action ring is provided, and the locking means is configured by the concave groove, while the flexible side plate When the protector main body and the inner needle are further moved integrally to the proximal end side of the outer needle hub from the state where the protective portion is located at the protected position due to the bending deformation of the rear end surface of the working ring. The working ring is moved to the proximal end side of the outer needle hub as the protector body and the inner needle are integrally moved to the proximal end side of the outer needle hub. The protector body is provided with an engaging protrusion for releasing the outer peripheral portion of the working ring from the inside of the concave groove and releasing the locking of the concave groove with respect to the working ring. The indwelling according to the above aspect <13>, wherein the locking release means is constituted by the engaging protrusion. Assembly.

  That is, unlike the conventional product, the protector for protecting the needle tip according to the present invention does not come into contact with the outer peripheral surface of the needle when the elastically deformed portion is attached to the needle. Therefore, when the needle and the protector main body attached thereto are moved relative to each other, no large sliding resistance is generated between the outer peripheral surface of the needle and the protector main body in contact therewith.

  In the protector for protecting the needle tip according to the present invention, in particular, the front end side provided with the engagement protrusion for preventing the action ring from being pulled out from the front end side of the protector body by engaging the front end surface of the action ring. The bottom plate is integrally formed with any one of the pair of parallel side plates. The pair of parallel side plates extend in parallel with the needle axis direction of the needle inserted through the first and second insertion holes of the protector body, that is, in the extending direction of the protector body, and thus are different from the flexible side plates. Thus, the working ring is not bent and deformed by the forward movement.

  Therefore, the front end side plate integrally formed with such a parallel side plate and the engagement protrusion provided thereon are displaced with the forward movement of the action ring, and the engagement protrusion with respect to the central axis of the protector body It can be effectively avoided that the protrusion angle changes. Thus, for example, unlike the case where the engaging protrusion is formed on the flexible side plate, the protrusion of the engaging protrusion with respect to the central axis of the protector body is independent of the amount of bending deformation and the bending angle of the flexible side plate. The angle is always a constant size. As a result, the engagement of the engagement protrusion with the front end surface of the action ring can be stably secured.

  Moreover, in the protector for protecting the needle tip according to the present invention, for example, the needle tip is moved unintentionally from a state where the needle tip is protected by the protection portion, and the needle tip is moved to a pair of flexible. Even when it comes to be positioned between the side plates, the needle tip is housed in the housing portion surrounded by the pair of flexible side plates, the pair of parallel side plates, the distal end side, and the proximal end bottom plate. Become so. For this reason, it is possible to reliably prevent the occurrence of a situation of jumping out from the inside of the protector body.

  Therefore, such a protector for protecting the needle tip according to the present invention is such that the protection of the needle tip can be carried out immediately and reliably after the removal of the needle from the patient with a smaller force. The protection state can be maintained even more stably.

  In the indwelling needle assembly according to the present invention, the protector for protecting the needle tip having the above-described excellent characteristics is attached to the inner needle removed from the patient. Therefore, substantially the same operation / effect as the operation of the needle tip protecting protector described in detail above can be enjoyed very effectively. As a result, the indwelling operation of the outer needle on the patient can be performed extremely safely and smoothly.

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

  First, FIG. 1 shows an embodiment of an indwelling needle assembly having a structure according to the present invention in a vertical cross-sectional form, and FIG. 2 is an enlarged view of a part thereof. Yes. As is apparent from these drawings, the indwelling needle assembly of the present embodiment includes an inner needle 10 and an inner needle hub that fixes the proximal end portion (the right end portion in FIGS. 1 and 2) of the inner needle 10. 12, an outer needle 14 that is externally inserted into the inner needle 10, an outer needle hub 16 that fixes a base end portion (right end portion in FIGS. 1 and 2) of the outer needle 14, and an inner portion of the outer needle hub 14. And a needle tip protecting protector 18 accommodated in the case. In this specification, when performing a needle puncture procedure to a patient using an indwelling needle assembly or a needle tip protector, the distal side of the practitioner is referred to as the distal end side and such a distal side. The end of the indwelling needle assembly or the needle tip protecting protector located on the distal side, or the end of each member constituting them is referred to as the distal end, and the proximal side of the practitioner is the proximal end, and Such an end portion on the base end side is referred to as a base end portion.

  More specifically, as shown in FIG. 3, the inner needle 10 is a hollow needle having a predetermined length and a sharp tip 20. An engaging portion 22 is formed in the vicinity of the needle tip 20 of the inner needle 10. The engaging portion 22 is such that a tube wall portion in the vicinity of the needle tip 20 of the inner needle 10 bulges radially outward in a part of the circumferential direction or over the entire circumference. Is formed by making the outer diameter larger than that of other tube wall portions. In addition, it does not specifically limit as a forming material of the inner needle 10, For example, metal materials, such as stainless steel, aluminum, an aluminum alloy, titanium, a titanium alloy, are used suitably.

  The inner needle hub 12 has a hub body 24 and a cap 26. The hub main body 24 has a cylindrical shape as a whole, and the inner hole 28 opens outward through the base side opening 30. The tip 32 of the inner needle hub 12 is provided with a through hole 33 extending in the axial direction. The inner needle 10 is inserted into and fixed to the through-hole 33 so that the proximal end portion of the inner needle 10 enters the inner hole 28 of the inner needle hub 12. Accordingly, the inner hole 28 communicates with the inner hole (pore) of the inner needle 10.

  As is clear from FIG. 3, the tip portion 32 of the inner needle hub 12 is provided with an annular step surface 34 on the outer peripheral surface of the intermediate portion in the axial direction. However, it is set as the intrusion part 36 whose diameter is smaller than the base side part. A plurality of thin plate-like plate-like protrusions 38 (four in this case) are erected integrally on the outer peripheral portion of the front end surface of the protrusion 36. The plurality of plate-like protrusions 38 are not shown in the figure, but two of them form a pair with each other, and the pair of the pair of protrusions 38 are arranged with the central axis of the inner needle hub 12 in between. Opposed. The plurality of plate-like protrusions 38 lock an action ring 60 (described later) of the needle tip protector 18 to the outer needle hub 16 when the inner needle hub 12 is assembled to the outer needle hub 16. After the inner needle hub 12 is assembled to the outer needle hub 16, unnecessary rotation of the needle tip protector 18 accommodated in the outer needle hub 16 is prevented, and the engagement of the working ring 60 with respect to the outer needle hub 16 is prevented. It has a role to prevent the stop state from being canceled unexpectedly.

  On the other hand, the cap 26 as a whole has a substantially stepped cylindrical shape with a distal end portion having a smaller diameter than the proximal end portion, and a ventilation filter 40 is provided in the opening on the proximal end side. Yes. The ventilation filter 40 has a property of allowing gas to permeate but not liquid. Examples of such a ventilation filter 40 include a sintered porous body obtained by sintering a polymer material such as polyethylene and a material containing a hydrophilic, water-soluble or water-swellable polymer, a hydrophobic nonwoven fabric, a porous material, and the like. A filter member made of a body or the like is used.

  Then, the cap 26 is detachably assembled to the hub body 24 by, for example, being press-fitted into the base side opening 30 of the hub body 24 at the small diameter distal end portion on the side opposite to the mounting side of the ventilation filter 40. It has been. Thus, the inner needle hub 12 is configured as an assembly of the hub body 24 and the cap 26.

  Inside the inner needle hub 12, a blood storage space 44 is formed by the inner hole 28 of the hub body 24 and the inner hole 42 of the cap which are in communication with each other. The blood storage space 44 communicates with the inner hole of the inner needle 10 on the distal end side of the hub body 24, and the proximal end side of the cap 26 is closed by the ventilation filter 40. Thereby, as will be described later, the blood that has flowed into the inner needle 10 flows into the blood storage space 44 in the inner needle hub 12 and is stored by flashback when the patient is punctured with the inner needle 10. It is designed not to leak outside. The material of the hub main body 24 and the cap 26 forming the inner needle hub 12 is not limited at all. However, it is desirable that the resin is made of a transparent or translucent resin so that the inflow of blood into the blood storage space 44 by flashback can be confirmed.

  On the other hand, as shown in FIGS. 2 and 4, the outer needle 14 is formed of a thin tube having a length shorter than that of the inner needle 10 and capable of being externally inserted into the inner needle 10. Unlike the inner needle 10, the outer needle 14 does not have a sharp needle tip, but has a tapered surface whose distal end surface gradually increases in diameter toward the proximal end side. As a result, the resistance when puncturing the patient's blood vessel together with the inner needle 10 is made as small as possible. In the vicinity of the distal end portion of the outer needle 14, one or a plurality of holes may be provided in order to increase the efficiency of the flow of the fluid flowing inside.

  The material of the outer needle 14 is not limited in any way, but has an appropriate flexibility so as not to damage the blood vessel wall when placed in the patient's blood vessel. It is desirable that In view of this, as a material for forming the outer needle 14, for example, various soft resins such as ethylene-tetrafluoroethylene copolymer, polyurethane, polyether nylon, and polypropylene are preferably used. The outer needle 14 preferably has transparency so that the flow of the liquid flowing through the inside can be grasped after being placed in the blood vessel of the patient. Further, the outer needle 14 may contain an X-ray contrast agent such as barium sulfate or barium carbonate in the forming material so that the position of the indwelling portion in the blood vessel of the patient can be grasped.

  As apparent from FIGS. 2 and 4, the outer needle hub 16 also has an overall cylindrical shape like the inner needle hub 12, and the inner hole opens outwardly through the proximal end side opening 52. doing. The inner hole of the outer needle hub 16 serves as a housing portion 54 serving as a hollow portion for housing the needle tip protecting protector 18 attached to the inner needle 10. The distal end portion 50 of the outer needle hub 16 is provided with a through hole 56 extending in the axial direction, and the outer needle 14 is inserted into and fixed to the through hole 56 at its proximal end portion. Accordingly, the accommodating portion 54 formed of the inner hole of the outer needle hub 16 communicates with the inner hole (pore) of the outer needle 14. As a method for fixing the outer needle 14 to the distal end portion 50 of the outer needle hub 16, for example, a method similar to the conventional method using an adhesive, a caulking pin or the like is employed.

  A locking groove 58 formed of a concave groove is formed in the axially intermediate portion of the inner peripheral surface of the outer needle hub 16 so as to extend continuously over the entire circumference. The locking groove 58 has a groove width and a depth into which an outer peripheral portion of an action ring 60 described later, which the needle tip protecting protector 18 accommodated in the accommodating portion 54 has, can enter. Of the two side surfaces of the locking groove 58, the side surface located on the distal end side of the outer needle hub 16 is a distal locking surface 62 having a tapered surface shape that gradually decreases in diameter toward the distal end side. On the other hand, the side surface located on the base end side of the outer needle hub 16 is a base end side locking surface 64 having a tapered shape opposite to the distal end side locking surface 62 that gradually decreases in diameter toward the base end side. ing.

  As shown in FIGS. 1 and 2, the inner needle 10 is inserted into the accommodating portion 54 of the outer needle hub 16 through the proximal end side opening 52 of the outer needle hub 16, and further, the accommodating portion 54. An outer needle 14 communicating with the inside is inserted. Further, the inner needle hub 12 fixed to the proximal end portion of the inner needle 10 is also inserted into the housing portion 54 of the outer needle hub 16 through the proximal end side opening 52. When the inner needle hub 12 enters into the accommodating portion 54 of the outer needle hub 16, the stepped surface 34 provided on the outer peripheral surface of the distal end portion 32 of the inner needle hub 12 is opened on the proximal end side of the outer needle hub 16. Only the protruding portion 36 on the distal end side of the inner needle hub 12 is inserted into the accommodating portion 54 so as to be regulated by contacting the peripheral edge portion of the opening 52. Thus, the inner needle hub 12 and the outer needle hub 16 are assembled to each other in a detachable state with the inner needle 10 inserted through the outer needle 14.

  Then, in a state where the inner needle hub 12 and the outer needle hub 16 are assembled to each other, the needle tip protecting protector 18 attached to the inner needle 10 is placed in the housing portion 54 of the outer needle hub 16 in the proximal end. It is inserted and accommodated through the side opening 52. In the indwelling needle of the present embodiment, the protector 18 for protecting the needle tip has a special structure not seen in the prior art.

  That is, as shown in FIG. 5, the needle tip protecting protector 18 includes the above-described action ring 60 and a protector main body 66 into which the action ring 60 is extrapolated. More specifically, the protector main body 66 is composed of a single metal body formed by bending and deforming one thin metal plate cut out in a predetermined shape at various sites. In addition, as a metal material which forms the protector main body 66, what exhibits elasticity in the form made into the board | plate material is used. For example, various metal materials such as stainless steel, aluminum, aluminum alloy, titanium, titanium alloy, copper, and copper-based alloy can be used.

  As apparent from FIGS. 6 to 11, the protector body 66 made of a single metal as a whole has a rectangular tube shape extending along the central axis P (indicated by a dashed line in FIG. 8). The first and second horizontal plate portions 68 and 70 and the first, second, third and fourth side plate portions 72, 74, 76 and 78 are integrally provided. .

  As shown in FIGS. 8 to 11, the first horizontal plate portion 68 and the second horizontal plate portion 70 have rectangular flat plate shapes having substantially the same size, and are mutually predetermined in the central axis: P direction of the protector body 66. Opposite each other at a distance, they are arranged so as to intersect the central axis P. A first insertion hole 80 and a second insertion hole 82 are formed at the center of each of the first horizontal plate portion 68 and the second horizontal plate portion 70. As is apparent from FIG. 8, the first insertion hole 80 provided in the first horizontal plate portion 68 and the second insertion hole 82 provided in the second horizontal plate portion 70 are both inner needles 10. It has a circular shape having a larger diameter than the outer diameter (shown by a two-dot chain line in FIG. 8). The diameter of the first insertion hole 80 is smaller than the outer diameter of the engagement portion 22 provided in the inner needle 10, while the diameter of the second insertion hole 82 is such an engagement. The dimension is larger than the outer diameter of the portion 22.

  Thereby, the protector main body 66 is inserted into the respective through holes 80 and 82 of the first and second horizontal plate portions 68 and 70 so that the protector body 66 is centered with respect to the needle axis direction with respect to the inner needle 10. The shaft is arranged so as to be movable in the needle axis direction while being arranged so as to extend in the needle axis direction with the axes P matched. When the protector body 66 moves in the needle axis direction of the inner needle 10, the engaging portion 22 of the inner needle 10 can pass through the through hole 82 of the second horizontal plate portion 70, but the first horizontal The plate portion 68 cannot pass through the through hole 80.

  On the other hand, as is apparent from FIGS. 6 to 9, the first to fourth side plate portions 72 to 78 each have a long rectangular flat plate shape. Then, at a position spaced in the direction perpendicular to the central axis P of the protector main body 66, the protector body 66 is disposed so as to surround the central axis P from four directions and extend along the central axis P.

  Among such first to fourth side plate portions 72 to 78, the first side plate portion 72 and the second side plate portion 74 positioned so as to face the four side edge portions of the first horizontal plate portion 68 exhibiting a rectangular shape. Of these, two edge portions located on both sides sandwiching the first insertion hole 80 are integrally extended toward the side where the second horizontal plate portion 70 is located. In other words, the first side plate portion 72, the second side plate portion 74, and the first horizontal plate portion 68 constitute a metal plate that is bent and deformed in a U-shape, and the U-shaped metal plates are mutually connected. The first side plate portion 72 and the second side plate portion 74 are formed by the two opposing plate portions, while the first horizontal plate is formed by the plate portion connecting the first side plate portion 72 and the second side plate portion 74. A portion 68 is formed.

  8 and 9, the first side plate portion 72 and the second side plate portion 74 are provided with the side plate portions 72, 74 facing the outside of the protector body 66 in the middle portion in the length direction. Each of the bent portions 83 is bent to a relatively gentle obtuse angle. As a result, the portions of the first side plate portion 72 and the second side plate portion 74 that are proximal to the bent portions 83 are parallel to each other in the central axis P direction, that is, the distance between the opposing surfaces. The first and second parallel extending portions 84 and 85 extend straight while maintaining a constant.

  A first stopper plate portion 86 and a second stopper plate portion 87 that extend integrally toward the second parallel extension portion 85 are provided on both side edges in the width direction of the first parallel extension portion 84. Are integrally provided so as to face each other. The first stopper plate portion 86 and the second stopper plate portion 87 press the first parallel extension portion 84 and the second parallel extension portion 85 toward the central axis P side of the protector main body 66. When an acting force to be applied is applied to the outer surface, the inner surface of the second parallel extending portion 85 comes into contact with or comes into contact. Accordingly, the parallel extending portions 84 and 85 are prevented from being bent and elastically deformed in a direction approaching the central axis P. As is clear from this, in the present embodiment, the first stopper plate portion 86 and the second stopper plate portion 87 constitute a stopper mechanism.

  On the other hand, the portions of the first side plate portion 72 and the second side plate portion 74 on the tip end side relative to the bent portions 83 gradually move from the central axis P of the protector body 66 toward the second horizontal plate portion 70 side. It inclines so that it may space apart, ie, the distance between mutually opposing surfaces may become large gradually. In addition, the inclined portion on the tip side of the bent portion 83 of the first side plate portion 72 is a first flexible piece portion 88, and on the tip side of the bent portion 83 of the second side plate portion 74. The inclined portion is a second flexible piece portion 89. Here, as described above, the first flexible piece 88 and the second flexible piece 88 and the second flexible piece 88 are prevented from being bent and elastically deformed toward the central axis P side of the parallel extending portions 84 and 85 as described above. When an acting force is applied to the flexible piece portion 89 toward the central axis P side of the protector main body 66, each of the flexible piece portions 88 and 89 rotates the bending portion 83 at the center of rotation. As described above, the body is bent and elastically deformed so as to rotate toward the inside of the protector main body 66. That is, the first and second flexible piece portions 88 and 89 are configured to be able to be bent and elastically deformed in a direction in which the distal end portions approach the central axis P.

  As shown in FIGS. 6 and 7, the first side plate portion 72 and the second side plate portion 74 have the parallel extension portions 84 and 85 on the proximal end side with respect to the bent portion 83 and the distal end side with respect to the bent portion 83. Slots 90 having a U-shape extending in the length direction across the respective flexible piece portions 88 and 89 and opening toward the first horizontal plate portion 68 are formed. As a result, the retraction preventing claw portion 91 formed of an elongated rectangular flat plate portion surrounded by the U-shaped slot 90 is provided for each of the flexible piece portions 88 and 89 of the first and second side plate portions 72 and 74. The flexible piece portions 88 and 89 are formed so as to incline toward the outside of the protector main body 66 in the same direction and at the same angle and extend integrally from the parallel extending portions 84 and 85. . That is, with respect to the first flexible piece portion 88 and the second flexible piece portion 89 (the first side plate portion 72 and the second side plate portion 74), the receding prevention claw portion 91 having an elongated rectangular plate piece form, Each is formed by cutting and raising. Thereby, each retraction preventing claw portion 91 can be bent and elastically deformed in a direction approaching the central axis P, independently of the flexible piece portions 88 and 89.

  Protection portions 92 and 93 are integrally formed at the distal ends of the first and second flexible piece portions 88 and 89, respectively. As shown in FIG. 8, the protective portions 92 and 93 are integrated with the flexible piece portions 88 and 89 from the tips of the flexible piece portions 88 and 89 with substantially the same width as the flexible piece portions 88 and 89. The elongated rectangular flat plate extending in the form of a bent plate has an overall shape that is folded back in a “U” shape inside the protector main body 66 at the tip side portion. That is, the protective portions 92 and 93 are obtuse with respect to the flexible piece portions 88 and 89 from the distal ends of the flexible piece portions 88 and 89 to the side opposite to the arrangement side of the first horizontal plate portion 68. The first protective plate portions 94 and 101 extending obliquely toward the central axis P at an inclination angle of from the front end of the first protective plate portions 94 and 101 to the arrangement side of the first horizontal plate portion 68. The first protective plate portions 94 and 101 are integrally provided with second protective plate portions 95 and 103 extending at an acute inclination angle toward the central axis P.

  And although the 2nd protection board parts 95 and 103 and the 1st protection board parts 94 and 101 of such protection parts 92 and 93 have the mutually same width, the former extension length is the latter extension. It is sufficiently smaller than the length. As a result, the tips of the second protection plate portions 95 and 103 of the protection portions 92 and 93 provided on the first and second flexible piece portions 88 and 89 are respectively allowed from the central axis P of the protector main body 66. It arrange | positions in the position separated only predetermined distance on the arrangement | positioning side of the bending piece parts 88 and 89. FIG. Further, the extension length of the first protection plate portion 94 of the protection portion 92 provided on the first flexible piece portion 88 of the first side plate portion 72 is the same as that of the second flexible piece portion 89 of the second side plate portion 74. The extension length of the first protection plate portion 101 of the provided protection portion 93 is longer by a predetermined dimension.

  Further, the first cover plate 94 of the protection portion 92 of the first flexible piece portion 88 is integrally formed with one side cover plate portion 98, 98 at each end edge in the width direction. Has been. The side lid plates 98, 98 have two oblique sides having substantially the same length as the length of the first protective plate 94, and the angle formed by the two oblique sides is the first protection. It has a substantially isosceles triangle shape having the same size as the inclination angle of the second protective plate portion 95 with respect to the plate portion 94. And, such two substantially isosceles triangular side cover plate portions 98, 98 are opposed to each other on both sides in the width direction with the protective portion 92 of the first flexible piece 88 interposed therebetween, and One oblique side portion is integrally formed so as to hang from the edge portions on both sides in the width direction of the first protection plate portion 94 in a state where the one oblique side portion is positioned corresponding to the side surface of the first protection plate portion 94 of the protection portion 92. -ing As a result, the side opening portions that open toward both sides in the width direction of the protection portion 92 having the bent plate shape of the first flexible piece portion 88 are covered with the two side cover plate portions 98 and 98, respectively. ing.

  Therefore, the direction in which the first flexible piece portion 88 of the first side plate portion 72 and the second flexible piece portion 89 of the second side plate portion 74 bring their respective front end portions closer to the central axis P of the protector body 66. That is, when the inside of the protector body 66 is bent and elastically deformed at the same time, as shown by the two-dot chain line in FIG. 8, the protective portions provided at the tip portions of the flexible piece portions 88 and 89, respectively. 92 and 93 approach each other, and the tip of the second protection plate portion 103 of the protection portion 93 of the second flexible piece portion 89 eventually becomes the first protection plate portion of the protection portion 92 of the first flexible piece portion 88. 94 is disposed at a position in contact with or just before the contact. At this time, the second horizontal plate portion 70, the protection portion 92 of the first flexible piece portion 88, and the protection portion 93 of the second flexible piece portion 89 are located closer to the distal end side than the second horizontal plate portion 70 of the protector body 66. Then, a substantially triangular prism-shaped front end side closed space 96 is formed in which the periphery is surrounded by two side lid plate portions 98 and 98 provided in the protection portion 92 of the first flexible piece portion 88. Further, the first and second horizontal plate portions 68 and 70 and the first to fourth side plate portions 72 to 78 are surrounded on the base end side of the protector body 66 from the second horizontal plate portion 70. A proximal end-side closed space 97 is formed as a substantially longitudinal rectangular accommodating portion.

  As shown in FIGS. 8 and 9, the third side plate portion 76 and the fourth side plate portion 78 are different from the first and second side plate portions 72 and 74 so as to bend them outward of the protector body 66. Without having any bent portions, the flexible piece portions 88 are arranged parallel to the central axis P of the protector body 66 from the side where the parallel extending portions 84 and 85 of the first and second side plate portions 72 and 74 are arranged. , 89 extends straight toward the 89 side. And these 3rd side board part 76 and the 4th side board part 78 are the direction of the 1st side board part 72 and the 2nd side board part 74 of the 1st and 2nd side board parts 72 and 74 in the direction orthogonal to the mutual opposing direction. The first and second stopper plate portions 86 and 87 are arranged on the outer sides of the first and second stopper plate portions 86 and 87 so as to face each other with a distance substantially the same as each width. Further, in such an arrangement state, the respective base end side portions are integrally connected to the edge portions on both sides in the width direction of the second parallel extending portion 85 of the second side plate portion 74. .

  And the 2nd horizontal board part 70 is integrally formed in the front-end | tip of such a 4th side board part 78. As shown in FIG. The second horizontal plate portion 70 extends in a direction perpendicular to the central axis P of the protector main body 66 and is arranged so as to be bridged between the third side plate portion 76 and the fourth side plate portion 78. Yes. In other words, the length of the fourth side plate portion 78 is longer than the third side plate portion 76 by a predetermined dimension, and the fourth side plate portion 78 has the same length as the third side plate portion 76. The tip side portion of the four side plate portion 78 is bent at a substantially right angle inside the protector main body 66. Thus, the second horizontal plate portion 70 having a rectangular flat plate shape is formed at the bent portion of the fourth side plate portion 78.

  As shown in FIGS. 10 and 11, one engagement protrusion 99 is integrally formed at each of the four corners of the second horizontal plate portion 70 having a rectangular flat plate shape. The engagement protrusion 99 is formed from both side edge portions of the two side edge portions (side surfaces) of the second horizontal plate portion 70 located on both sides in the opposite direction of the third side plate portion 76 and the fourth side plate portion 78. It has a plate-like small piece shape that protrudes integrally with the same length. That is, each of the engaging protrusions 99 is provided integrally with the second lateral plate portion 70 integrally formed with the fourth side plate portion 78, and each of the third side plate portion 76 and the fourth side plate portion 78. It protrudes in the direction perpendicular to the central axis P from the outer surface on the opposite side to the outer side of the protector body 66.

  On the other hand, as shown in FIGS. 12 and 13, the action ring 60 extrapolated to the protector body 66 has four rectangular side walls 100 a, 100 b, 100 c, and 100 d that are rectangular as a whole. And a frame-like shape in which a rectangular inner hole is formed. And among the four side wall parts 100a-100d of this action ring 60, the distance between the planar inner surfaces of a pair of side wall parts 100a, 100b facing each other is the first and second side plate parts 72, 74. The distance between the planar inner surfaces of another pair of side wall portions 100c, 100d adjacent to the side wall portions 100a, 100b and facing each other is slightly larger than the width of The dimensions are slightly larger than the widths of the third and fourth side plate portions 76 and 78.

  A concave groove 102 having a rectangular cross section is formed at the center of each end face of each of the four side wall portions 100a to 100d of the working ring 60 in the longitudinal direction of the side wall portions 100a to 100d (see FIG. 12 is formed so as to extend in the horizontal direction or the vertical direction. In other words, since the four concave grooves 102, 102, 102, 102 are provided on the end faces on both sides of the working ring 60 so as to extend in the circumferential direction at intervals in the circumferential direction. is there. Each concave groove 102 has a width and a length into which the tip portion of the retraction preventing claw portion 91 can enter.

  Of the four side surfaces of the concave grooves 102, the side surface located on the inner surface side of each of the side wall portions 100 a to 100 d is a first engagement surface 104. The opposing side surface is a second engagement surface 106. That is, the action ring 60 has the first engagement surface 104 and the second engagement surface 106 in the four concave grooves 102, 102, 102, 102 provided on each end surface with respect to the end surfaces on both sides thereof. Correspondingly, four each are provided so as to extend in the circumferential direction at intervals in the circumferential direction.

  The material of the working ring 60 is not particularly limited. As described later, when the action ring 60 is inserted into the protector main body 66 and moved to the distal end side, two flexible pieces are provided. Any material may be used as long as the portions 88 and 89 and the retraction preventing claw portions 91 and 91 can be bent and elastically deformed against their urging forces. In view of this, as a material for forming the action ring 60, for example, a resin material, a metal material, a ceramic material, or an elastic material such as rubber or elastomer is appropriately used. Examples of such resin materials include polyolefin resins such as polyethylene, polypropylene, polybutadiene, and ethylene-vinyl acetate copolymer, polyvinyl chloride, polyurethane, polystyrene, polymethyl methacrylate, polycarbonate, polyamide, polyethylene terephthalate, and polybutylene. In addition to polyester resins such as terephthalate, various resin materials such as acrylic resins, ionomers, polyacetals, polyphenylene sulfides, and polyether ether ketones can be exemplified. Examples of the metal material include stainless steel, aluminum, aluminum alloy, titanium, titanium alloy, copper, and copper-based alloy. Examples of the elastic material include natural rubber, isoprene rubber, butadiene rubber, thermoplastic elastomer, and the like.

  As shown in FIG. 5, the working ring 60 includes the first and second parallel extending portions 84 and 85 of the first and second side plate portions 72 and 74, and the third and fourth side plates adjacent to the first and second parallel extending portions 84 and 85. The protector main body 66 composed of the portions 76 and 78 is extrapolated and assembled to the proximal end portion. Thus, the needle tip protecting protector 18 is configured as an assembly of the protector main body 66 and the action ring 60.

  As shown in FIGS. 1 and 2, the proximal end side portion of the inner needle 10 extending from the distal side bottom wall portion 32 of the inner needle hub 12 is the first and second horizontal plate portions 68 of the protector body 66. , 70 is inserted into first and second insertion holes 80, 82, respectively, so that the needle tip protector 18 is in the needle axis direction (the center of the protector main body 66 with respect to the inner needle 10). (Axis: coincides with P) is movably mounted. In such a mounted state, the inner needle 10 is inserted into the outer needle 14, and the inner needle hub 14 is inserted into the accommodating portion 54 of the outer needle hub 16 and assembled to the outer needle hub 16. Thus, the needle tip protecting protector 18 is accommodated in the accommodating portion 54 of the outer needle hub 16. Thus, the indwelling needle assembly of the present embodiment is configured, and is used for the procedure of puncturing the outer needle 14 into a blood vessel of a patient or the like and placing it, for example.

In the state before use of the indwelling needle assembly of the present embodiment, the outer peripheral portion of the action ring 60 that is extrapolated to the proximal end portion of the protector body 66 is inserted into the locking groove 58 of the outer needle hub 16. Thus, both end surfaces of each corner portion of the action ring 60 are locked to the distal end side locking surface 62 and the proximal end side locking surface 64 of the locking groove 58, respectively. Accordingly, the easy movement of the action ring 60 in the housing portion 54 in the axial direction (the distal end direction and the proximal end direction) is restricted. As is apparent from this, the locking means is constituted by the locking groove 58 here.

  Next, a method of using the indwelling needle assembly having the above structure will be described in detail.

  First, as shown in FIG. 1, the inner needle hub 12 and the outer needle hub 16 are assembled, and the inner needle 10 and the outer needle 14 are inserted into the patient while the inner needle 10 is inserted into the outer needle 14. Puncture the blood vessel.

  Thereafter, the inner needle 10 is removed from the outer needle 14 by withdrawing the inner needle hub 12 from the accommodating portion 54 of the outer needle hub 16 and moving it backward. As a result, only the outer needle 14 is placed while being punctured into a blood vessel of a patient or the like. At this time, the protector 18 for protecting the needle tip attached to the inner needle 10 and accommodated in the accommodating portion 54 of the outer needle hub 16 is engaged with the engaging groove 58 of the accommodating portion 54 at the outer peripheral portion of the working ring 60. Therefore, movement is blocked. Therefore, the inner needle 10 slides on the inner peripheral surfaces of the two first and second insertion holes 80 and 82 of the protector main body 66 and is relatively operated with respect to the needle tip protector 18. Move backward toward the side.

  Then, as shown in FIG. 14A, the engagement portion 22 provided on the needle tip 20 side of the inner needle 10 is moved to the second horizontal plate portion 70 of the protector body 66 by the backward movement of the inner needle 10. When the first insertion portion 82 passes through the second insertion hole 82 having a large diameter and reaches the position at which the first horizontal plate portion 68 is disposed, the engagement portion 22 becomes the first insertion hole 80 having a small diameter in the first horizontal plate portion 68. Engage with the peripheral edge of the opening without passing through. At this time, the needle tip 20 is located between the two protection portions 92 and 93 provided at the tips of the first and second flexible piece portions 88 and 89, respectively, and is more than the needle tip 20 of the inner needle 10. The distal end portion on the base end side is located between the opposing surfaces of the first horizontal plate portion 68 and the second horizontal plate portion 70 of the protector body 66.

  When the inner needle 10 is further moved backward from the state, the protector body 66 engaged with the engaging portion 22 of the inner needle 10 is moved together with the inner needle 10 as shown in FIG. The outer needle hub 16 moves backward toward the proximal end side opening 52.

  At this time, the action ring 60 extrapolated to the protector main body 66 is maintained at the position where each corner is locked in the locking groove 58 without moving yet by the locking to the locking groove 58. Therefore, the protector body 66 moves relative to the action ring 60, whereby the action ring 60 slides on the outer surfaces of the first to fourth side plate portions 72 to 78 of the protector body 66, and Move to the tip side. At that time, the action ring 60 is formed on the flat inner surfaces of the first and second side wall portions 100a and 100b, and the first flexible piece portion 88 and the receding prevention claw portion of the first side plate portion 72 of the protector body 66. 91 and the second flexible piece 89 and the retraction preventing claw 91 of the second side plate 74 are pressed in a direction approaching the inner needle 10 to bend and elastically deform in the same direction as that.

  As a result, as described above, the distal end side closed space 96 and the proximal end side closed space 97 are formed on the distal end side and the proximal end side of the protector body 66. Thus, the needle tip 20 is accommodated in the distal side closed space 96, and the distal end portion of the inner needle 10 on the proximal side with respect to the needle tip 20 is located in the proximal side closed space 97. Is located in the storage. As a result, the entire tip including the needle tip 20 of the inner needle 10 is covered and protected by the protector main body 66. As is clear from this, in the present embodiment, the first flexible piece 88 and the second flexible piece 89 are bent and elastically deformed in the direction in which they approach each other, so that the protective portions 92 and 93 are connected to each other. The positions where the two are brought into contact with each other or substantially in contact with each other are the protected positions of the protective portions 92 and 93. As described above, the third side plate portion 76 and the fourth side plate portion 78 extend straight in parallel to the central axis P direction of the protector main body 66, so that the working ring 60 is relative to the protector main body 66. During the forward movement, the flat inner surfaces of the third and fourth side walls 100c and 100d of the working ring 60 are not pressed against the inside of the protector main body 66. Therefore, neither bending deformation nor elastic deformation is caused. It is never done.

  Then, when the action ring 60 moves to the distal end side of the protector main body 66 or until such a movement is reached until each protection portion 92, 93 reaches a protection position that covers and protects the needle tip 20 of the inner needle 10. When the action ring 60 further moves from the position to the front end side of the protector main body 66, as shown in FIG. 15, the end surface (front end face) on the forward side of the action ring 60 located on the front end side of the protector main body 66 is The protector main body 66 engages with the four engaging protrusions 99, 99, 99, 99 formed integrally with the second horizontal plate part 70. As a result, further forward movement of the action ring 60 is prevented, and the action ring 60 can be prevented from coming off from the distal end side of the protector body 66.

  Further, at this time, as shown in FIG. 14B and FIG. 16, the position where the action ring 60 gets over the retraction preventing claw portions 91 and 91 of the first and second flexible piece portions 88 and 89. To reach. Then, in a state in which the deformed state of the first and second flexible piece portions 88 and 89 is maintained, only the retraction preventing claw portions 91 are restored from the elastically deformed state, and the first flexible piece portion 88 and the second flexible piece portion 88 and second The distal end portions of the respective retraction preventing claw portions 91 provided in the flexible piece portions 89 are respectively inserted into the recessed grooves 102 provided in the respective rear end surfaces of the first side wall portion 100a and the second side wall portion 100b of the action ring 60. , Rush or fit respectively.

  As a result, the distal end portion of each retraction preventing claw portion 91 is engaged with the first engagement surface 104 and the second engagement surface 106 formed by the two inner surfaces of the groove 102. Due to the engagement of the distal end portion of each retraction preventing claw portion 91 with the first engagement surface 104, each retraction preventing claw portion 91 becomes useless in the approaching direction to the inner needle 10 from the contact state with the action ring 60. Elastic deformation is restricted. Further, the direction in which each retraction preventing claw portion 91 is separated from the inner needle 10 from the contact state with the action ring 60 by the engagement of the distal end portion of each retraction preventing claw portion 91 with the second engagement surface 106. Unnecessarily elastic deformation is restricted. As a result, it is prevented that the contact state of each retraction prevention claw portion 91 with the action ring 60 is easily eliminated, and the action ring 60 retreats from the position where each retraction prevention claw portion 91 enters the concave groove 102. Movement is prevented.

  Further, an unexpected external force that presses the flexible piece portions 88 and 89 toward the inside of the protector main body 66 is applied to the flexible piece portions 88 and 89 so that the flexible piece portions 88 and 89 approach the inner needle 10. In addition, even when further deformed and elastically deformed, the engagement of the retraction preventing claw 91 with the action ring 60 is prevented. Further, even if an unexpected external force is applied to each of the backlash prevention claw portions 91 such that they are pressed inside the protector main body 66 or spread outward, the backwashing prevention claw portions 91 are not affected by the inner needle 10. It is also possible to prevent the engagement of the retraction preventing claw portion 91 with respect to the action ring 60 by being easily bent and elastically deformed in the direction approaching or separating from the movement ring.

  Then, from the state where the relative movement in both the forward direction and the backward direction of the action ring 60 with respect to the protector body 66 is prevented, as shown in FIG. 14C, the inner needle 10 and the protector body 66 are moved. Both are further moved backward. Then, the action ring 60 is pressed in the retracting movement direction of the protector main body 66 by the engagement protrusions 99 of the protector main body 66, and the base of the locking groove 58 provided on the inner peripheral surface of the outer needle hub 16. The outer peripheral portion of the action ring 60 slides with respect to the end side locking surface 64, and the locked state with respect to the locking groove 58 is eliminated. Thereby, the action ring 60 is moved backward together with the inner needle 10 and the protector body 66. At this time, the action ring 60 remains engaged with the respective engagement protrusions 99 of the protector main body 66 and the respective retraction preventing claw parts 91, so that the flexible piece parts 88 and 89 are moved by the action ring 60. The state of bending deformation and elastic deformation, that is, the state in which the needle tip 20 of the inner needle 10 is protected by the protection portions 92 and 93 is maintained. As is clear from this, in this embodiment, the engagement protrusion 99 constitutes the locking release means.

  Then, by further backward movement of the inner needle 10, the entire inner needle 10 together with the protector 18 for protecting the needle tip is protected while the needle tip 20 of the inner needle 10 is protected by the protection portions 92 of the protector body 66. The needle hub 16 is detached from the accommodating portion 54.

  As apparent from the above description, in the indwelling needle assembly of the present embodiment, when the inner needle 10 with the needle tip protector 18 attached is removed from the outer needle 14, the inner needle 10 Although the first and second insertion holes 80 and 82 provided in the protector body 66 of the protector 18 slide on the inner peripheral surfaces, the elastically deformed portions are formed on the outer peripheral surface of the inner needle 10. There is no contact with biasing force. Therefore, when the inner needle 10 is moved backward relative to the protector body 66, a large sliding resistance based on the biasing force is generated between the inner peripheral surface of the inner needle 10 and the protector body 66. Nor.

  Therefore, if the indwelling needle assembly of this embodiment is used, the needle tip 20 of the inner needle 10 is protected by the needle tip protector 18 with a smaller force, and the inner needle 10 from the patient is protected. It can be carried out immediately and reliably after removal. In addition, the protection state of the needle tip 20 of the inner needle 10 by the needle tip protector 18 can be maintained even more stably. As a result, the operation of placing the outer needle 14 on the patient can be carried out extremely safely and smoothly.

  A second bottom wall portion 70 is integrally formed at the distal end portion of the fourth side plate portion 78 that is not easily bent and elastically deformed, and the central axis of the protector main body 66 with respect to the outer peripheral surface of the second horizontal plate portion 70. A plurality of engaging protrusions 99 protruding in a direction perpendicular to P are provided. Then, the engagement with the plurality of engagement protrusions 99 restricts the relative forward movement of the action ring 60 with respect to the protector body 66, and prevents the protector body 66 from coming out from the distal end side. It has become. Therefore, for example, even after the inner needle 10 is removed, even if the protector main body 66 in which the needle tip 20 is housed is picked with a finger, the orientation of the plurality of engaging protrusions 99 that engage with the action ring 60 It can be advantageously prevented that the engagement state between each engagement protrusion 99 and the action ring 60 becomes unstable or disappears due to a change in the angle.

  Further, since the fourth side plate portion 78 is not deformed at all by the forward movement of the action ring 60 with respect to the protector main body 66, the second side plate portion 70 integrally formed with the fourth side plate portion 78, and The engagement protrusions 99 provided are displaced inward or outward of the protector main body 66 by the relative movement of the action ring 60 with respect to the protector main body 66, and the engagement protrusions 99 with respect to the central axis P of the protector main body 66. The protruding angle, that is, the angle between the central axis P and the front end surface of the action ring 60 of the engaging protrusion 99 and the contact surface (the angle indicated by α in FIG. 6) may change. Can be effectively avoided. Thereby, for example, each engaging protrusion with respect to the central axis P of the protector body 66 regardless of the amount of bending deformation and the bending angle of the flexible piece portions 88 and 89 of the first and second side plate portions 72 and 74. A protrusion angle of 99: α is always a constant size. As a result, the engagement of each engaging projection 99 with respect to the front end surface of the action ring 60 is stably ensured, and the extraction of the action ring 60 from the protector body 66 can be reliably prevented. Therefore, after the inner needle 10 is removed from the patient or the like, the protection state of the needle tip 20 of the inner needle 10 by the protection portions 92 and 93 can be maintained more stably.

  The flexible side plates 88 and 89 can be elastically deformed in addition to bending deformation. Therefore, useless bending deformation of each flexible piece part 88 and 89 is prevented by the biasing force exhibited based on elasticity. Therefore, when the inner needle 10 is removed from the patient, the two protective portions 92 and 93 come into contact with the outer peripheral surface of the inner needle 10 due to unnecessary bending deformation of the flexible piece portions 88 and 89, so that the inner needle It is possible to effectively prevent the occurrence of excessive sliding resistance between the inner peripheral surface 10 and the protector main body 66.

  The second bottom wall portion 70 provided with the second insertion hole 82 is integrally formed with the first parallel extension plate portion 84 that is not bent and deformed by a stopper mechanism or the like by the first and second stopper plate portions 86 and 87. It is provided on the four side plate portion 78. Therefore, not only the first horizontal plate portion 68 in which the first insertion hole 80 is formed, but also the second bottom wall portion 70 is caused by the bending deformation of the flexible piece portions 88 and 89 accompanying the movement of the action ring 60. The relative positions of the first bottom wall portion 68 and the second bottom wall portion 70, the mutual orientation, and the like are not changed by the bending deformation of the flexible piece portions 88 and 89. Therefore, the positions of the first insertion hole 80 and the second insertion hole 82 do not change, so that the external insertion state of the protector main body 66 to the inner needle 10, and consequently the inner needle of the protector main body 66. The relative movement with respect to 10 is also stable. As a result, the diameter of each of the insertion holes 80 and 82 can be reduced while suppressing the sliding resistance of the inner needle 10 with respect to the inner peripheral surfaces of the first and second insertion holes 80 and 82 as much as possible. The effect that the positioning accuracy of the protector body 66 with respect to the needle 10 can be improved is expected.

  Each protection part 92,93 has the 1st protection board part 94,101 and the 2nd protection board part 95,103 integrally, and is exhibiting the bending shape folded in the shape of a "<". . As a result, even if the needle tip 20 of the inner needle 10 is protected by the protection portions 92 and 93, it is displaced toward the first protection plate portions 94 and 101 and the second protection plate portions 95 and 103. In order to contact and engage with each of the protection plate portions 94, 95, 101, 103, the front end side closed space 96 that accommodates the needle tip 20 of the inner needle 10 formed by the protection portions 92, 93 is provided. Separation can be advantageously prevented.

  Two side cover plate portions 98 and 98 are provided for the protective portion 92 integrally formed with the first flexible piece portion 88 so as to close both side opening portions in the width direction. As a result, the needle tip 20 of the inner needle 10 is accommodated in the distal end side closed space 96 in a state in which all of the periphery of the inner needle 10 is surrounded, thereby protecting the needle tip 20 of the inner needle 10. Can be implemented more reliably.

  A state in which the needle tip 20 of the inner needle 10 is protected by the protection portions 92 and 93 by the engagement of the retraction preventing claw portion 91 with the first engagement surface 104 and the second engagement surface 106 provided on the action ring 60. The position where the action ring 60 is arranged with respect to the protector main body 66 is maintained. Also by this, the needle tip 20 of the inner needle 10 can be more reliably protected.

  The first engagement surface 104 and the second engagement surface 106 with which the retraction preventing claw portion 91 engages are configured by two opposite side surfaces of the concave groove 102 provided on the end surface of the action ring 60. . For this reason, the 1st engagement surface 104 and the 2nd engagement surface 106 can be provided at once and easily only by formation of the ditch | groove 102 with respect to the action ring 60. FIG. This contributes at least to the simplification of the structure of the working ring 60 and thus the protector 18 for protecting the needle tip and the improvement of the manufacturability.

  A concave groove 102 having a first engagement surface 104 and a second engagement surface 106 is provided on each side end surface of each of the four side wall portions 100 a to 100 d of the working ring 60. For this reason, it is not necessary to extrapolate the action ring 60 to the protector main body 66 in a predetermined direction or orientation, and the assembling property of the action ring 60 with respect to the protector main body 66 can be advantageously improved.

  One retraction prevention claw portion 91 is disposed on each side of the protector main body 66 on both sides of the inner needle 10 inserted through the two first and second insertion holes 80 and 82 and has a function. A concave groove 102 having first and second engaging surfaces 104 and 106 is provided in the ring 60 corresponding to each retraction preventing claw portion 91. Thereby, the retraction preventing claw portion 91 can be more reliably engaged with the first and second engaging surfaces 104 and 106. As a result, the effect of preventing movement of the action ring 60 at a predetermined position with respect to the protector body 60 can be more reliably exhibited.

  Retraction prevention claw portions 91 are respectively provided on the first and second flexible side plates 88 and 89 that are bent and elastically deformed by the action ring 60 inserted on the protector main body 66. For this reason, for example, apart from the flexible piece portions 88 and 89, a portion that can be bent and elastically deformed by the action ring 60 is provided on the protector body 66, and the retraction preventing claw portion 91 is provided at the portion. As compared with the case of forming, the backward movement prevention claw portion 91 can be easily formed. Moreover, the retraction preventing claw portion 91 is integrally formed by cutting and raising the respective flexible piece portions 88 and 89. This further facilitates the formation of the retraction preventing claw portion 91 for each of the flexible piece portions 88 and 89.

  The protector body 66 is configured as a single body formed by partially bending and deforming one metal plate having a predetermined shape. For this reason, for example, as compared with the case where the protector main body 66 is formed by assembling or fixing various parts, the protector main body 66 and, consequently, the needle tip protecting protector 18 as a whole can be manufactured more effectively. Can be enhanced.

  As mentioned above, although one Embodiment of this invention was explained in full detail, this is an illustration to the last, Comprising: This invention is not limited at all by the specific description regarding this Embodiment.

  For example, in the above-described embodiment, the protector body 66 is formed using a single metal plate that can be elastically deformed. However, the flexible piece portions 88 and 89 of the protector body 66 are flexible. If it has, it does not necessarily have elasticity. On the other hand, the retraction preventing claw portion 91 must have elasticity. Therefore, the protector main body 66 can be formed of a material other than a metal material as long as it has characteristics required for various parts. For example, the entire protector main body 66 can be formed using a resin material, or can be configured by combining various materials having characteristics required in various parts. That is, the protector body 66 may be assembled or fixed to several parts made of different materials, for example, metal parts or resin parts, or parts made of a material different from metal or resin. Or may be formed.

  Further, when a resin material is used as the entire or a part of the protector body 66, for example, polyolefin resin such as polyethylene, polypropylene, polybutadiene, ethylene-vinyl acetate copolymer, polyvinyl chloride, polyurethane, In addition to polyester resins such as polystyrene, polymethyl methacrylate, polycarbonate, polyamide, polyethylene terephthalate, polybutylene terephthalate, etc., various resin materials such as acrylic resins, ionomers, polyacetals, polyphenylene sulfides, polyether ether ketones, respectively, or Two or more of them are combined and used as a forming material. Of course, also in the protector main body 68 using these resin materials, it is necessary that the flexible side plate has flexibility and the retraction preventing claw portion has elasticity.

  In the above embodiment, the retraction preventing claw portion 91 is formed on the first and second side plate portions 72 and 74 provided with the first and second flexible piece portions 88 and 89, respectively. It can also be provided on the third and fourth side plate portions 76 and 78 where the piece portions 88 and 89 are not provided. In this case, for example, each of the third and fourth side plate portions 76 and 78 is provided with a U-shaped slot that opens toward the base end side, and is surrounded by this slot. The retraction preventing claw portion 91 can be provided by cutting and raising the base portion of the portion so that the portion is inclined toward the outside of the protector body 66. The method for forming the slot is not limited in any way, and can be easily formed, for example, by stamping.

  For the first to fourth side plate portions 72 to 78, a simple U-shaped cut is formed instead of the slot, and the portion surrounded by the cut is formed by simply forming this cut or the portion of the protector body 66. It is also possible to form the receding prevention claw portion 91 by cutting and raising bent outward.

  The slots and notches provided in the first to fourth side plate portions 72 to 78 for forming the retraction preventing claw portion 91 are not limited to the illustrated U-shape, and are, for example, V-shaped or mountain-shaped. The shape may be a shape such as a U shape.

  For example, a long small piece member is fixed integrally to a predetermined portion of the protector main body 66 such as the first to fourth side plate portions 72 to 78 and the first horizontal plate portion 68 other than them. By doing so, it is possible to provide the retraction prevention claw portion with a structure other than cutting and raising.

  The first engagement surface 104 and the second engagement surface 106 provided on the action ring 60 are engaged with the retraction preventing claw portion 91 that is in contact with the rear end surface of the action ring 60, and retreat in the direction approaching the needle 10. As long as elastic deformation of the blocking claw portion 91 is restricted, the formation position, the number of formations, the form, and the like are not particularly limited.

  Therefore, for example, a concave groove continuously extending over the entire circumference is provided on the rear end surface of the working ring, and the first engagement surface and the second engagement surface are formed on the two side surfaces of the concave groove. You can also In addition, the contact portion of the backlash prevention claw portion on the rear end surface of the working ring is provided with recesses or grooves such as holes corresponding to the number of backlash prevention claw portions, and the recesses or groove grooves are provided. Of the inner surface, the first engagement surface and the second engagement surface can be formed by two inner surface portions respectively positioned on the inner peripheral surface side and the outer peripheral surface side of the working ring. Further, a protrusion or a ridge extending in the circumferential direction is provided on the rear end face of the action ring instead of or in addition to the above-described recess or groove, and the action of the protrusion or the side face of the protrusion is provided. The first engagement surface and the second engagement surface can also be formed by two side surface portions respectively positioned on the inner peripheral surface side and the outer peripheral surface side of the ring. In addition, when only the first engagement surface is formed on the rear end surface of the working ring, a stepped surface that makes the outer peripheral side portion of the working ring one step higher than the inner peripheral side portion in the axial direction of the working ring It is also possible to form the first engagement surface with the step surface.

  The shape of the action ring is not limited to the illustrated rectangular frame shape, and may be any shape as long as it can be extrapolated to the protector body to be extrapolated. From that point, for example, a cylinder or an annular shape, a C-shape obtained by removing a part of the circumference of such a cylinder or an annular shape, or a polygonal frame shape other than a rectangle, Various shapes such as a shape obtained by removing a part of the circumference of the rectangular or polygonal frame shape can be employed.

  The number of the flexible piece portions 88 and 89 and the backward movement prevention claw portions 91 is not necessarily two, and the number of the flexible piece portions 88 and 89 and the backward movement prevention claw portions 91 are shown in FIG. As shown in FIG. Moreover, three or more may be sufficient. In the case where a plurality of flexible piece portions are provided, it is only necessary that a protective portion is provided at the tip of at least one of the plurality of flexible piece portions.

  In addition, in the above-described embodiment, the specific example in which the protector for protecting the needle tip according to the present invention is applied to the protector attached to the inner needle of the indwelling needle assembly is shown, but the protector for protecting the needle tip according to the present invention is Attached to various needles where the outer needle is not extrapolated at all, such as an injection needle attached to the tip of a syringe or a needle attached to the tip of a tube connected to a container for infusion or blood collection Of course, any of them can be advantageously applied.

  In addition, although not listed one by one, the present invention can be carried out in a mode to which various changes, modifications, improvements, etc. are added based on the knowledge of those skilled in the art. It goes without saying that all are included in the scope of the present invention without departing from the spirit of the present invention.

It is longitudinal cross-sectional explanatory drawing which shows one Embodiment of the indwelling needle assembly which has a structure according to this invention. It is a principal part expansion explanatory drawing in FIG. It is longitudinal cross-sectional explanatory drawing which shows the inner needle and inner needle hub which the indwelling needle assembly shown by FIG. 1 has. It is a longitudinal cross-sectional explanatory drawing which shows the outer needle and outer needle hub which the indwelling needle assembly shown by FIG. 1 has. It is a perspective explanatory view which shows the protector for needle-tip protection provided with the structure according to this invention which the indwelling needle assembly shown by FIG. 1 has. It is front explanatory drawing of the protector main body which comprises the protector for needle tip protection shown by FIG. 5, Comprising: It is a figure corresponded to VI arrow of FIG. It is a back surface explanatory view of the protector main part shown in Drawing 6, and is a figure equivalent to the VII arrow of Drawing 8. It is VIII-VIII cross-section explanatory drawing in FIG. It is IX arrow explanatory drawing in FIG. It is X arrow explanatory drawing in FIG. It is XI arrow explanatory drawing in FIG. It is front explanatory drawing of the effect | action ring which comprises the protector for needle-tip protection shown by FIG. It is XIII-XIII sectional explanatory drawing in FIG. BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing which shows the use condition of the indwelling needle assembly which has a structure according to this invention, Comprising: (a) shows the state which moved the inner needle backward, and accommodated the front-end | tip part in the inside of a protector main body. Yes. (B) shows a state where the protector body is moved backward together with the inner needle to protect the needle tip of the inner needle. (C) shows a state in which the inner needle whose tip is protected by the protector body is detached from the outer needle hub together with the protector for protecting the tip. It is a perspective explanatory view of the protector for protecting the needle tip showing a state in which the action ring is engaged with the engagement protrusion of the protector body by the forward movement of the action ring with respect to the protector body. The protector main body protector main body protector according to the first embodiment of the present invention has a forward movement of the working ring with respect to the protector body, and the protector body retracting claw is engaged with the first engagement surface and the second engagement surface of the working ring. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Inner needle 12 Inner needle hub 14 Outer needle 16 Outer needle hub 18 Needle point protection protector 20 Needle point 22 Engagement part 54 Accommodating part 58 Locking groove 60 Working ring 66 Protector body 80, 82 Through hole 88 1st flexibility One part 89 Second flexible piece part 91 Retraction prevention claw part 92,93 Protection part 99 Engagement protrusion 102 Recessed groove 104 First engagement surface 106 Second engagement surface

Claims (14)

A protector body that is attached to the needle so as to be movable in the needle axis direction and that extends in the needle axis direction, and an action ring that is externally attached to the protector body so as to be movable in the needle axis direction. both,
The protector body is
A first base hole plate that has a first insertion hole through which the needle is inserted, and is disposed on the base end side of the protector body so as to extend across the needle axis direction of the needle;
The first insertion hole in a state of being opposed to each other with a predetermined distance from each of a pair of edge portions located on both sides of the first insertion hole of the base end side bottom plate. So that it extends toward the needle tip side of the needle inserted into the base, and is formed integrally with the base end side bottom plate, and the distance between the opposing surfaces gradually increases toward the needle tip side of the needle. A pair of flexible side plates that can be bent and deformed in the direction of mutual approach,
When the pair of flexible side plates are bent and deformed toward each other in a state where the protector main body is moved to the needle tip side of the needle inserted through the first insertion hole, the needle tip of the needle is moved. A protection portion provided at a tip portion of at least one of the pair of flexible side plates, which is located at a covering protection position and protects the needle tip;
A pair of parallel side plates facing each other in a direction perpendicular to the opposing direction of the pair of flexible side plates and extending in parallel with the needle axis direction of the needle inserted through the first insertion hole;
Of the pair of parallel side plates, the needle has a second insertion hole through which a portion closer to the needle tip side than the insertion portion to the first insertion hole is inserted, and on the distal end side of the protector body A tip side bottom plate integrally formed so as to extend toward any one of the leading edge portions,
The first insertion hole of the distal end side bottom plate and the proximal end bottom plate are formed by a space surrounded by the distal end side bottom plate, the proximal end side bottom plate, the pair of flexible side plates, and the pair of parallel side plates. An accommodating portion for accommodating a part of the needle respectively inserted through the second insertion hole;
A member integrally formed with the front end side bottom plate so as to protrude outward from an outer surface of at least one side plate of the pair of parallel side plates and the pair of flexible side plates from an edge portion of the front end side bottom plate. Having a mating protrusion,
Along with the forward movement of the action ring toward the distal end side of the protector body, the pair of flexible side plates are pressed inward in the opposing direction by the action ring to bend and deform in the approaching direction. Thus, the protection portion is positioned at the protection position, and the front end surface located on the forward movement side of the working ring is engaged with the engagement protrusion of the front end side bottom plate, whereby the front end of the protector body A protector for protecting a needle tip, which is configured to prevent the action ring from being pulled out from the side.   The protector for protecting a needle tip according to claim 1, wherein the flexible side plate has elasticity.   A bent portion that bends the intermediate portion in the extending direction of each of the pair of flexible side plates in a direction in which the distal end side portion from the intermediate portion is separated from the needle inserted through the first and second insertion holes. The distance between the opposed surfaces of the bent portion of the pair of flexible side plates is gradually increased toward the needle tip side of the needle, so that it is bent and deformed in the approaching direction. While the flexible piece portion is made possible, the base end side portion of each of the pair of flexible side plates is a parallel extending portion extending in parallel with each other in the needle axis direction of the needle. Furthermore, a stopper mechanism is provided for the pair of parallel extending portions to prevent bending deformation of the parallel extending portions in the approaching direction of the pair of flexible side plates. , In each base end portion, integrally with the pair of parallel extending portions The needle tip protector of claim 1 or claim 2 are connected.   A stopper plate portion extending toward at least one of the pair of parallel extending portions is formed integrally with the stopper plate portion, and the stopper mechanism is formed by the stopper plate portion. The stopper plate part is configured to abut against a parallel extension part different from the parallel extension part on which the stopper plate part is formed, thereby preventing the pair of parallel extension parts from being bent in the approaching direction. The protector for protecting the needle tip according to claim 3, wherein   The protector for protecting a needle tip according to claim 1 or 2, wherein the pair of parallel side plates are integrally formed with the base end side bottom plate.   The distal side bottom plate is disposed so as to extend perpendicularly to the needle axis direction of the needle inserted through the first insertion hole and the second insertion hole, and the engagement The needle tip according to any one of claims 1 to 5, wherein the protrusion extends from an end edge portion of the tip side bottom plate in a direction perpendicular to the needle axis direction of the needle. Protective protector.   The protection part includes a first protection plate part extending from a distal end portion of the flexible side plate toward a needle tip side of the needle, and a needle tip side from an end portion of the first plate portion on the needle tip side. The protector for protecting a needle tip according to any one of claims 1 to 6, wherein the protector has a bent plate shape including a second protective plate portion integrally extending toward the opposite side.   The first protection plate portion and the first protection plate portion of the protection portion so as to cover the side opening portions of the protection portion having a bent shape that open toward both sides in a direction perpendicular to the needle axis direction of the needle. The two side cover board parts which are mutually opposing positions in the direction orthogonal to a needle-axis direction on both sides of 2 protection board parts are further provided in this protection part. Needle point protector.   With respect to at least one of the pair of flexible side plates and the pair of parallel side plates, an elastically deformable receding prevention claw portion is provided so as to extend toward the tip side of each of the side plates, Although the forward movement of the working ring toward the tip side of the protector body is allowed by the elastic deformation of the retraction preventing claw part, the working ring moves until the protective part is positioned at the protective position. The action ring is moved back to the base end side of the protector body by being restored from the elastically deformed state and coming into contact with the rear end surface of the action ring located on the side opposite to the forward movement direction of the action ring. The protector for protecting a needle tip according to any one of claims 1 to 8, wherein the needle tip is protected.   The protector for protecting a needle tip according to claim 9, wherein the retraction preventing claw portion is integrally formed by cutting and raising at least one of the pair of flexible side plates and the pair of parallel side plates. .   The protector for protecting a needle tip according to claim 9 or 10, wherein the retraction preventing claw portion is integrally formed only on at least one of the pair of flexible side plates.   The protector for protecting a needle tip according to any one of claims 1 to 11, wherein the protector body is configured as a single body made of one metal plate. An inner needle hub, an inner needle extending from the distal end of the inner needle hub, an outer needle hub, and a hollow outer needle extending from the distal end of the outer needle hub, and inside the outer needle hub, A hollow portion communicating with the inner hole of the outer needle is formed so as to open to the outside through a proximal-side opening provided in a proximal end portion of the outer needle hub, and the inner needle is inserted into the outer needle. In addition, the inner needle hub and the outer needle hub are assembled to each other by the distal end portion of the inner needle hub being inserted into the hollow portion through the proximal end side opening of the outer needle hub. An indwelling needle assembly comprising:
The protector for protecting a needlepoint according to any one of claims 1 to 12, wherein the outer needle is attached to the protector main body so as to be movable in the needle axis direction with respect to the inner needle. While being accommodated in the hollow portion of the hub so as to be movable in the needle axis direction,
When the inner needle is withdrawn from the outer needle and the inner needle hub is separated from the outer needle hub through the proximal end side opening, the protector body engages with the protector body. The inner needle is provided with an engagement portion that allows the inner needle to move integrally with the proximal end of the outer needle hub,
Further, when the protector main body and the inner needle move integrally to the proximal end side of the outer needle hub, the protector main body and the inner needle are engaged with the action ring of the needle tip protecting protector and moved to the proximal end side of the outer needle hub. A locking means for preventing the movement of the working ring is provided in the hollow portion of the outer needle hub, and the protector body and the inner needle are integrally moved to the proximal end side of the outer needle hub, The flexible side plate is bent and deformed until the working ring is moved relatively to the tip side of the protector body and the protection part of the flexible side plate is positioned at the protection position. ,
When the protector main body and the inner needle are further moved integrally to the base end side of the outer needle hub from the state where the protection portion is located at the protection position, the locking means is locked to the action ring. The indwelling needle assembly is provided with unlocking means for releasing and allowing the working ring and the inner needle to move integrally with the proximal end of the outer needle hub. Solid.   On the inner peripheral surface of the hollow portion of the outer needle hub, there is provided a concave groove to which the action ring is locked, and the locking means is constituted by the concave groove, while the flexible side plate is bent and deformed. Thus, when the protector body and the inner needle are further integrally moved to the proximal end side of the outer needle hub from the state in which the protective portion is located at the protected position, the working ring is opposite to the rear end surface. Engaging the front end surface of the outer needle hub, and pressing the working ring toward the proximal end side of the outer needle hub as the protector body and the inner needle are integrally moved to the proximal end side of the outer needle hub. An engagement projection for releasing the outer peripheral portion of the working ring from the inside of the concave groove and releasing the locking of the concave groove with respect to the working ring is provided on the protector body, and the unlocking is performed. 14. The indwelling needle assembly according to claim 13, wherein the means is constituted by the engaging protrusion.

Images