JP2010088521A - Indwelling needle assembly - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an indwelling needle assembly which reliably achieves prevention of leakage of blood through an outer needle and protection of a needle point of an inner needle removed from the outer needle without an increase in size of the entire assembly. <P>SOLUTION: An inner needle hub 12 and an outer needle hub 16 are mutually assembled by inserting the front end 38 of the inner needle hub 12 having the front end from which the inner needle 11 extends into the opening 40 of the base end side of the outer needle hub 16 having a front end from which the outer needle 14 extends, and by inserting the inner needle 10 through the outer needle 14. In addition, a needle point protector 78 for protecting a needle point 18 of the inner needle 10 is housed in a housing tube 34 provided in a part of the front end side of the inner needle hub 12. Further, a hemostasis valve 76 for preventing the leakage of the blood through the outer needle 14 is housed and disposed in the housing 54 of the outer needle hub 16. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an improvement of an indwelling needle assembly that is punctured and placed in a blood vessel during artificial dialysis, infusion, or blood collection.

  Conventionally, when a treatment such as artificial dialysis, infusion, blood transfusion or the like is performed on a patient or the like, an indwelling needle assembly is often used as a treatment instrument. As is well known, this indwelling needle assembly has an inner needle hub from which the inner needle extends from the tip, and a hollow outer needle hub from which the hollow outer needle extends from the tip. The inner needle hub and the outer needle hub are assembled to each other by inserting the distal end portion of the inner needle hub into the proximal end side opening of the outer needle hub while being inserted into the outer needle. Yes. After both the inner needle and the outer needle are punctured into a blood vessel of a patient or the like, the inner needle is pulled out from the blood vessel and removed from the outer needle so that the outer needle is left in the blood vessel and used. -ing

  By the way, when such an indwelling needle assembly is used, blood may leak out of the body of a patient or the like through the outer needle from which the inner needle has been removed. Therefore, in many of the conventional indwelling needle assemblies, a hemostasis valve is accommodated in the outer needle hub to prevent leakage of blood from the proximal end side opening of the outer needle hub to the outside. . (For example, refer to Patent Document 1 below).

  In addition, if the inner needle removed from the outer needle remains exposed after use of the indwelling needle assembly, the doctor, nurse, or inner needle disposer may be accidentally exposed. There is a risk that an accidental puncture accident such as a puncture of a finger or the like with the needle tip of the needle may occur. When this erroneous puncture accident occurs, there is a risk of causing infection by blood adhering to the needle tip. For this reason, when removing the inner needle from the outer needle, an indwelling needle assembly with a needle tip protection protector that covers and protects the needle tip so that it is not exposed to the outside is proposed. (For example, see Patent Document 2 below).

  In this indwelling needle assembly, the outer needle hub is passed through the proximal needle side opening of the outer needle hub together with the inner needle while the protector for protecting the needle tip is attached to the inner needle so as to be movable in the needle axis direction. Is housed inside. When the inner needle is removed from the outer needle and moved relative to the protector to reach a predetermined movement position, the needle tip of the inner needle is covered with a protective portion provided on the protector. It is configured to be protected. As a result, the occurrence of an accidental puncture accident can be prevented in advance.

  As described above, in the conventional indwelling needle assembly, in order to prevent blood leakage through the outer needle, the hemostasis valve is generally accommodated in the outer needle hub, and an accidental puncture accident is caused. In order to prevent this, a structure in which the protector for protecting the needle tip is accommodated in the outer needle hub has been adopted.

JP 2004-242663 A Japanese Patent Laid-Open No. 2001-514943

  Therefore, in such a conventional indwelling needle assembly, in order to simultaneously take measures for preventing blood leakage and preventing accidental puncture accidents, both the hemostasis valve and the needle tip protection protector are provided in the outer needle hub. There was a need to place the accommodation. However, in such a case, the axial length of the outer needle hub is inevitably increased, which increases the overall size of the indwelling needle assembly, resulting in poor handleability. There is also the possibility of hindering the implementation of blood transfusion procedures.

  Therefore, the present invention can prevent the leakage of blood through the outer needle and the prevention of an erroneous puncture accident by protecting the needle tip of the inner needle removed from the outer needle without causing an increase in the size of the entire assembly. It is an object to provide an indwelling needle assembly that can be achieved.

  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 employed in any combination, and the aspect and technical features of the present invention are not limited to those described below, and the entire specification is not limited. It should be understood that the invention can be recognized based on the inventive concept disclosed in the description and the drawings.

<1> An inner needle hub, an inner needle extending from the distal end of the inner needle hub, a hollow outer needle hub, and a hollow outer needle extending from the distal end of the outer needle hub. The distal end portion of the inner needle hub is inserted into the proximal end side opening of the outer needle hub while being inserted into the outer needle, whereby the inner needle hub and the outer needle hub are assembled to each other. A needle tip protector for protecting the needle tip of the inner needle is attached to the inner needle, and the needle tip protector is a) having an insertion portion through which the inner needle is inserted, and the inner needle being inserted into the insertion portion so as to be movable in the needle axis direction and extended in the needle axis direction with respect to the inner needle; When the inner needle is withdrawn from the outer needle, the inner needle engages with an engaging portion provided on the inner needle and moves integrally with the inner needle. A protector main body, and (b) a tip end portion extending toward the needle tip side at a position separated from the inner needle inserted through the insertion portion of the protector main body in a direction perpendicular to the needle axis direction. A flexible piece provided in the protector main body, and (c) the protector main body is moved to the needle tip side of the inner needle inserted through the insertion portion. In this state, when the flexible piece is bent and deformed in a direction in which the tip portion approaches the inner needle, the flexible piece is positioned at a protection position that covers the needle tip and protects the needle tip. A protective portion provided at the tip of the piece; and (d) the flexible piece that is externally attached to the protector main body so as to be movable in the needle axis direction, and that moves forward to the tip side of the protector main body. Are bent in a direction in which the tip portion approaches the inner needle, and the protective portion is moved forward. And an action ring positioned at the protection position, and the blood flowing into the outer needle hub through the inner hole of the outer needle when the inner needle is removed from the outer needle. A hemostasis valve for preventing outflow from the proximal end side opening is accommodated and disposed at the distal end side in the outer needle hub, and is further spaced from the outer peripheral side of the inner needle at the distal end portion of the inner needle hub. And a housing cylinder portion extending in the needle axis direction of the inner needle, the protector body mounted on the inner needle in the housing cylinder portion, and the working ring externally attached to the protector body And a locking projection that extends into the outer needle hub through the opening on the distal end side of the storage cylinder is integrally formed on the working ring, and the locking projection is The inner needle is removed from the outer needle by being locked to the outer needle hub. As the inner needle and the protector body move together, the working ring is moved forward relative to the protector body, and the flexible piece is bent and deformed to An indwelling needle assembly characterized by being positioned at the protection 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.

<2> The locking protruding portion of the working ring is provided in an intermediate portion in the extending direction, and extends into the outer needle hub from the annular reinforcing portion that does not interfere with the protector body. The indwelling needle assembly according to the above aspect <1>, wherein the indwelling needle assembly has a plurality of extended locking pieces that are pulled out and locked to the outer needle hub.

<3> An annular groove extending continuously in the circumferential direction is formed on the inner peripheral surface of the outer needle hub, and a locking projection protruding from the tip of the locking protrusion is formed in the annular groove. The indwelling needle assembly according to the above aspect <1> or <2>, which enters and is locked.

<4> When the inner needle and the protector main body are further integrally moved from the state where the protection portion is located at the protection position due to the bending deformation of the flexible piece, The above aspect <1> to <1> wherein the engaging protrusion for releasing the locking of the locking protrusion with respect to the outer needle hub by moving the action ring together with the protector body is provided on the protector body. The indwelling needle assembly as described in any one of <3>.

<5> The inner needle hub is formed of a cylindrical body, and a chamber communicating with the inner hole of the inner needle is provided on the proximal end side with respect to the housing tube portion, and further, the proximal end of the chamber The indwelling needle assembly according to any one of the above aspects <1> to <4>, wherein a filter member that prevents passage of liquid is attached to the side opening, but allows passage of air.

<6> The inner needle hub is formed of a cylindrical body, and a partition wall portion that divides the inner hole of the inner needle hub into two in the axial direction at an axially intermediate portion of the inner needle hub. The inner needle hub has a distal end side portion with respect to the partition wall portion serving as the accommodating tube portion, while the partition wall portion has a base end side portion inside, and the partition wall portion to the base end side. Any one of the above aspects <1> to <5>, in which a fixed cylindrical portion extending in the axial direction is provided, and the inner needle is inserted and fixed in the inner hole of the fixed cylindrical portion. The indwelling needle assembly according to 1.

  In the indwelling needle assembly according to the present invention, a hemostasis valve that prevents leakage of blood through the inner hole of the outer needle when the inner needle is removed from the outer needle is housed in the outer needle hub. In addition, when the inner needle is removed from the outer needle, a needle tip protection protector that covers and protects the needle tip of the inner needle is housed and disposed in the housing cylinder provided at the tip side portion of the inner needle hub. Yes.

  In short, in the indwelling needle assembly of the present invention, the portion of the inner space of the outer needle hub that is on the tip side of the portion where the inner needle hub is inserted, that is, in the conventional indwelling needle assembly, the hemostasis valve and needle Only the hemostasis valve is accommodated and disposed in the inner space portion on the distal end side of the outer needle hub in which both of the front protection protectors are to be accommodated. And in the conventional indwelling needle assembly, the inner space of the distal end side portion of the inner needle hub that was only used as the portion inserted into the proximal end side opening of the outer needle hub is efficiently utilized, A protector for protecting the needle tip is accommodated.

  Therefore, in the indwelling needle assembly of the present invention, for example, in the case where both the hemostasis valve and the needle tip protection protector are accommodated and disposed at the tip side portion of the inner space portion of the outer needle hub from the insertion portion of the inner needle hub. Unlike this, the hemostasis valve and the needle tip protector are advantageously and efficiently installed inside the assembly without any increase in the overall length of the outer needle hub, while maintaining its conventional size. Can be housed.

  Therefore, such an indwelling needle assembly does not deteriorate the handleability due to the increase in size of the entire assembly, and does not interfere with the implementation of procedures such as artificial dialysis, infusion, and blood transfusion. The leakage of blood and the occurrence of an accidental puncture accident caused by the inner needle removed from the outer needle can be prevented very effectively.

  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 clear 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 left 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, and an outer needle hub 16 that fixes a base end portion (right end portion in FIGS. 1 and 2) of the outer needle 14. 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 sharpened tip 18. An engaging portion 20 is formed in the vicinity of the needle tip 18 of the inner needle 10. The engaging portion 20 is such that a tube wall portion in the vicinity of the needle tip 18 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 22 and a cap 24. The hub main body 22 has a substantially cylindrical shape as a whole, and the inner hole 26 opens outwardly through the distal end side opening 28 and the proximal end opening 30. A partition wall portion 32 that divides the inner hole 26 into two portions in the axial direction is integrally formed at the inner end portion of the hub body 22 in the axial direction. The distal end side portion of the hub body 22 from the portion where the partition wall portion 32 is formed is a housing cylinder portion 34 that communicates with the outside through the distal end side opening 28, while the proximal end portion of the hub body 22 is proximal to the partition wall portion 32. However, the mounting cylinder portion 36 communicates with the outside through the proximal end side opening portion 30.

  A plurality (four in this case) of thin flat plate-like plate-like protrusions 38 extending in the axial direction are provided on the distal end surface of the housing cylinder portion 34 at a certain distance in the circumferential direction, It is erected integrally. The plurality of plate-like protrusions 38 are elastically deformable on the inner side of the accommodating cylinder part 34 and are not shown in FIG. 3, but are side surfaces (thicknesses) located on the outer peripheral side of the accommodating cylinder part 34. One surface of the direction) is an arc surface having a diameter that is substantially the same as or slightly larger than the inner diameter of the proximal end side opening 40 of the outer needle hub 16 described later. Accordingly, the inner needle hub 12 is inserted into the proximal end side opening 40 of the outer needle hub 16 at the distal end portion of the housing cylinder portion 34 where the plurality of plate-like protrusions 38 are formed ( (See FIG. 2).

  On the other hand, a fixed cylinder part 42 is erected integrally with the attachment cylinder part 36 coaxially with respect to the proximal end side end face of the partition wall part 32 inside the attachment cylinder part 36. Then, the inner needle 10 extending through the partition wall portion 32 is inserted into the inner hole 44 of the fixed cylinder portion 42 so that the base end portion thereof enters the inner hole of the mounting cylinder portion 36. Is fixed. As a result, the inner hole of the mounting cylinder portion 36 communicates with the inner hole (pore) of the inner needle 10.

  The cap 24 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 46 is provided in the opening on the proximal end side. The ventilation filter 46 has a characteristic of allowing gas to permeate but not liquid. Examples of such a ventilation filter 46 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, and a porous material. A filter member made of a body or the like is used.

  The cap 24 can be removed from the hub body 22 by being press-fitted into the proximal end opening 30 of the hub body 22 at the distal end portion having a small diameter opposite to the side where the ventilation filter 46 is mounted. It is assembled to. Thereby, the inner needle hub 12 is configured as an assembly of the hub body 22 and the cap 24.

  Under such an assembled state of the hub main body 22 and the cap 24, the inner hole of the mounting cylinder portion 36 of the hub main body 22 and the inner hole of the cap 24 are communicated with each other. A chamber 48 is formed. The chamber 48 communicates with the inner hole of the inner needle 10 fixed to the fixed cylinder portion 42 on the distal end side of the hub main body 22, and the opening on the proximal end side of the cap 24 is closed by the ventilation filter 46. ing. As a result, as will be described later, blood that has flowed into the inner needle 10 flows into the chamber 48 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. The material of the hub main body 22 and the cap 24 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 inflow of blood into the chamber 48 due to 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 the tip end surface is a tapered surface that gradually decreases in diameter toward the tip 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 is clear from FIGS. 2 and 4, the outer needle hub 16 has a substantially cylindrical overall shape, and the inner hole opens outwardly through the proximal end side opening 40. The inner hole of the outer needle hub 16 serves as a housing portion 54. A cylindrical fixing projection 56 is integrally formed on the front end surface of the outer needle hub 16 on the same axis. A through-hole 58 extending through the tip end 50 of the outer needle hub 16 of the fixing projection 56 and extending in the axial direction is provided.

  While the through hole 58 is a first cylindrical portion 60 having a cylindrical surface-like inner peripheral surface whose diameter is slightly larger than that of the outer needle 14 at a portion located on the distal end side of the outer needle hub 16. A portion located in the middle in the axial direction of the outer needle hub 16 is a second cylindrical portion 62 having a cylindrical surface-like inner peripheral surface larger in diameter than the first cylindrical portion 60, and further a portion located on the proximal end side thereof. However, the tapered cylindrical portion 64 has a tapered inner peripheral surface that gradually becomes smaller in diameter toward the distal end side. In addition, the outer needle 14 is inserted into the through hole 58 at the base end portion through the first cylindrical portion 60 to the second cylindrical portion 62. Further, in such a state, a caulking pin corresponding to the inner peripheral surfaces of the second cylindrical portion 62 and the tapered cylindrical portion 64 in the tapered cylindrical portion 64 of the through hole 58 and having an outer surface shape slightly smaller than that. 66 is press-fitted from the opening on the proximal end side of the through hole 58. As a result, the outer needle 14 inserted into the through hole 58 is sandwiched and held in the second cylindrical portion 62 between the outer peripheral surface of the tip end portion of the caulking pin 66 and the inner peripheral surface of the second cylindrical portion 62. Yes. Thus, the outer needle 14 is fixed to the distal end portion of the outer needle hub 16.

  The caulking pin 66 has a hollow tapered cylindrical shape whose inside is a hollow portion 68. As a result, the inner hole of the outer needle 14 fixed to the distal end portion of the outer needle hub 16 communicates with the inside of the housing portion 54 of the outer needle hub 16 through the hollow portion 68.

  An annular groove 70 extending continuously in the circumferential direction over the entire circumference is formed in the axially intermediate portion of the inner circumferential surface of the outer needle hub 16. The annular groove 70 is a tapered locking surface 72 having a tapered surface shape in which a side surface located on the proximal end side of the outer needle hub 16 gradually decreases in diameter toward the proximal end side.

  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 40 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 located at the proximal end side opening 40 of the outer needle hub 16, in other words, the proximal end side portion of the accommodating portion 54 of the outer needle hub 16. Has been inserted. As described above, the inner needle hub 12 is inserted into the proximal end side opening 40 of the outer needle hub 16 by the plurality of plate-like protrusions 38 provided at the distal end portion of the inner needle hub 12. This is realized by being plunged into the base end side opening 40. Thus, the inner needle hub 12 and the outer needle hub 14 are assembled with each other in an easily removable state.

  In the indwelling needle assembly of the present embodiment, the inner needle hub 12 in the housing portion 54 of the outer needle hub 16 is assembled in a state where the inner needle hub 12 and the outer needle hub 16 are assembled to each other as described above. A hemostasis valve 76 is accommodated and disposed in a portion on the distal end side with respect to the insertion portion. In addition, a needle tip protection protector 78 is housed and disposed in the housing cylinder portion 34 of the inner needle hub 12 in a state of being attached to the inner needle 10.

  More specifically, the hemostasis valve 76 has the same structure as that disclosed in, for example, Japanese Patent Application Laid-Open No. 2004-242663. That is, the hemostasis valve 76 is a single product integrally molded using an elastic material such as various rubber materials and thermoplastic elastomer materials, and has an opening / closing portion 80 and a cylindrical portion 82. The opening / closing part 80 has a substantially thick disk shape having an outer diameter smaller than the inner diameter of the accommodating part 54 of the outer needle hub 16 by a predetermined dimension. In the center of the opening / closing portion 80, a notch 84 that is pushed and spread by the inner needle 10 is provided. The cylindrical portion 82 has a substantially thin cylindrical shape, and integrally extends coaxially from the surface on one side in the thickness direction of the disk-shaped opening / closing portion 80. An annular plate-shaped outer flange portion 86 having an outer diameter slightly larger than the inner diameter of the accommodating portion 54 is integrally provided at the distal end portion of the cylindrical portion 82.

  A pusher 88 is assembled to the hemostasis valve 76. The pusher 88 is made of a hard resin material or the like, and has a cylindrical shape that can be inserted into the inner hole of the cylindrical portion 82 of the hemostasis valve 76 as a whole. The outer peripheral surface of one end portion in the axial direction of the pusher 88 has a tapered surface shape that gradually decreases in diameter toward the one end side in the axial direction. Further, an annular plate-shaped outer flange 90 is integrally provided at the other axial end of the pusher 88.

  A pusher 88 is coaxially inserted into the inner hole of the cylindrical portion 82 of the hemostasis valve 76. Under this condition, the end face of one end of the pusher 88 whose outer peripheral surface is tapered is brought into contact with the opening / closing part 80 of the hemostasis valve 76, and the outer flange part 90 of the pusher 88 is the outer flange of the hemostasis valve 76. A pusher 88 is assembled to the hemostasis valve 76 so as to be superimposed on the portion 86.

  Then, such an assembly of the hemostasis valve 76 and the pusher 88 presses the outer peripheral surface of the outer flange portion 86 of the hemostasis valve 76 against the inner peripheral surface of the housing portion 54 of the outer needle hub 16, and In a state where the outer flange portion 86 is in contact with the inner surface of the distal end portion 50 of the outer needle hub 16, the outer flange portion 86 is inserted and accommodated at the distal end side of the accommodating portion 54. Under this accommodated state, the hemostasis valve 76 is prevented from easily moving in the axial direction within the accommodating portion 54 by the frictional resistance based on the restoring force of the outer flange portion 86 pressed against the inner peripheral surface of the accommodating portion 54. ing. The pusher 88 also has an outer flange portion 90 sandwiched between the distal end portion 50 of the outer needle hub 16 and the outer flange portion 86 of the hemostasis valve 76 to restrict axial movement in the housing portion 54. . Alternatively, an engagement portion is provided on the inner peripheral surface of the outer needle hub 16, and the hemostasis valve 76 and the pusher 88 are engaged with the engagement portion, thereby restricting the movement of the hemostasis valve 76 and the pusher 88. Has been. Then, the inner needle 10 inserted into the accommodating portion 54 elastically deforms the opening / closing portion 80 so as to push and widen the notch 84 of the hemostasis valve 76, and is inserted into the notch 84 while being inserted into the tube portion 82 of the hemostasis valve 76. This is inserted into the inner hole of the pusher 88 and the through hole 58 of the distal end portion 50 of the outer needle hub 16 and further into the outer needle 14.

  Thus, the inner needle 10 in which the inner needle 10 is inserted into the outer needle 14 through the notches 84 of the opening / closing part 80 of the hemostatic valve 76 and the inner holes of the cylinder part 82 and the pusher 88 will be described later. When the inner needle 10 is removed, the notch 84 of the hemostasis valve 76 is closed by the restoring force from the elastically deformed state of the opening / closing part 80. At this time, the gap between the inner peripheral surface of the accommodating portion 54 of the outer needle hub 16 and the outer peripheral surface of the hemostasis valve 76 is liquidated by the outer flange portion 86 of the hemostasis valve 76 pressed against the inner peripheral surface of the accommodating portion 54. It is tightly sealed. As a result, the communication of the inner hole of the outer needle 14 into the accommodating portion 54 of the outer needle hub 16 is closed. As a result, leakage of blood to the outside through the outer needle 14 from which the inner needle 10 has been removed is prevented.

  When a treatment such as infusion or blood transfusion is performed after the inner needle 10 is removed, for example, a tip of a syringe (not shown) is inserted into the accommodating portion 54 through the proximal end side opening 52 of the outer needle hub 16. Then, with such a tip, the opening / closing part 80 of the hemostasis valve 76 is pressed toward the distal end side of the outer needle hub 16. Thereby, while elastically deforming the cylindrical portion 82 to contract, the notch 84 of the opening / closing portion 80 is expanded at the tapered cylindrical end portion of the pusher 88, and the inner surface of the notch 84 is formed on the outer peripheral surface of the end portion. Engage. Then, the notch 84 is kept open. Thereafter, treatment such as infusion or blood transfusion is started.

  On the other hand, the protector 78 for protecting the needle tip accommodated in the accommodating cylinder portion 34 of the inner needle hub 12 is extrapolated to the protector main body 92 and the protector main body 92 as shown in FIGS. And a working ring 94 formed.

  The protector main body 92 is configured as a single metal body formed by bending and deforming a thin metal plate cut into a predetermined shape at various portions. In addition, as a metal material which forms the protector main body 92, 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 main body 92 made of a single metal body has a generally bottomed corner extending as a whole along the central axis (indicated by P in FIGS. 8 and 10). It has a cylindrical shape and includes two lateral plates, a proximal side lateral plate 96 and a distal end side lateral plate 98, a first flexible side plate 100, a second flexible side plate 102, a first parallel side plate 104, and a second parallel side plate 106. It has four side plates integrally.

  The proximal-side lateral plate 96 and the distal-side lateral plate 98 have a rectangular flat plate shape having substantially the same size, and face each other with a predetermined distance in the central axis: P direction of the protector main body 92. It is arrange | positioned so that it may orthogonally cross. A first insertion hole 108 and a second insertion hole 110 are formed at the center of each of the proximal side lateral plate 96 and the distal end side lateral plate 98. As is apparent from FIG. 10, the first insertion hole 108 provided in the proximal end side lateral plate 96 and the second insertion hole 110 provided in the distal end side lateral plate 98 are both the inner needle 10 ( It has a circular shape having a larger diameter than the outer diameter of the two-dot chain line in FIG. The diameter of the first insertion hole 108 is smaller than the outer diameter of the engagement portion 20 provided in the inner needle 10, while the diameter of the second insertion hole 110 is such an engagement. The dimension is larger than the outer diameter of the portion 20.

  Thus, the protector body 92 is inserted into the insertion holes 108 and 110 of the distal end side and proximal end side lateral plates 96 and 98 so that the protector body 92 is in the needle axis direction and the central axis with respect to the inner needle 10. : P is matched, and is arranged so as to be movable in the needle axis direction while being arranged so as to extend in the needle axis direction. When the protector main body 92 moves in the direction of the needle axis of the inner needle 10, the inner needle 10 slides on the inner peripheral surface of each of the first and second insertion holes 108 and 110, and the sliding In some cases, the engagement portion 20 of the inner needle 10 can pass through the second insertion hole 110 of the distal side lateral plate 98 but cannot pass through the first insertion hole 108 of the proximal side lateral plate 96. It has become.

  On the other hand, as is clear from FIGS. 6 to 9, the first and second flexible side plates 100 and 102 and the first and second parallel side plates 104 and 106 both have a long rectangular flat plate shape. Further, at a position spaced in the direction perpendicular to the central axis P of the protector main body 92, the protector main body 92 is disposed so as to surround the central axis P from four directions and extend along the central axis P.

  Among the four side plates 100 to 106, the first flexible side plate 100 and the second flexible side plate 102 positioned opposite to the first flexible side plate 100 are among the four side edges of the base-side side plate 96 having a rectangular shape. The first insertion hole 108 is integrally extended from the two edge portions located on both sides of the first insertion hole 108 toward the side where the distal side lateral plate 98 is located. In other words, the first flexible side plate 100, the second flexible side plate 102, and the base end side lateral plate 96 constitute a metal plate that is bent and deformed in a U-shape.

  As is clear from FIGS. 10 and 11, the first flexible side plate 100 and the second flexible side plate 102 are provided with the flexible side plates 100, 102 in the middle portion in the length direction of the protector main body 92. Bending portions 112 are provided to be bent toward the outside in a relatively gentle obtuse angle. Thus, the base end side portions of the first flexible side plate 100 and the second flexible side plate 102 with respect to the bent portions 112 are parallel to each other in the central axis P direction, that is, between the opposing surfaces. The first and second parallel extending portions 114 and 116 extend straight while maintaining a constant distance.

  A first stopper plate portion 118 and a second stopper plate portion 120 that integrally extend toward the second parallel extension portion 116 are provided at the edge portions on both sides in the width direction of the first parallel extension portion 114. Are integrally provided so as to face each other. The first stopper plate portion 118 and the second stopper plate portion 120 press them against the first parallel extending portion 114 and the second parallel extending portion 116 toward the central axis P side of the protector main body 92. When an acting force is applied to the outer surface, the inner surface of the second parallel extending portion 116 comes into contact with or comes into contact with the inner surface. Accordingly, the parallel extending portions 114 and 116 are prevented from being bent and elastically deformed in a direction approaching the central axis P.

  On the other hand, the portions of the first flexible side plate 100 and the second flexible side plate 102 on the distal end side relative to the bent portions 112 are gradually from the central axis P of the protector body 92 toward the distal end side lateral plate 98 side. Are inclined so that the distance between the opposing surfaces gradually increases. And the inclined part of the front end side rather than the bending part 112 of such a 1st flexible side board 100 is made into the 1st flexible piece part 122, On the other hand, the front end rather than the bending part 112 of the 2nd flexible side board 102 The inclined portion on the side is the second flexible piece portion 124. Here, as described above, the first flexible piece portion 122 and the second flexible piece portion 122 and the second flexible portion 114 and 116 are prevented from being bent and elastically deformed toward the central axis P side of the parallel extending portions 114 and 116, respectively. When an acting force is applied to the flexible piece portion 124 toward the central axis P side of the protector main body 92, each of the flexible piece portions 122 and 124 rotates about the bent portion 112. As described above, the body is bent and elastically deformed so as to rotate toward the inside of the protector main body 92. That is, the first and second flexible piece portions 122 and 124 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 flexible side plate 100 and the second flexible side plate 102 are provided with the parallel extension portions 114 and 116 closer to the base end side than the bent portion 112 and more than the bent portion 112. Slots 126 each having a U-shape extending in the length direction across the flexible pieces 122 and 124 on the distal end side and opening toward the proximal side lateral plate 96 are formed. As a result, the retraction preventing claw portion 128 formed of an elongated rectangular flat plate portion surrounded by the U-shaped slot 126 with respect to the flexible piece portions 122 and 124 of the first and second flexible side plates 100 and 102. Are formed in such a manner as to incline toward the outside of the protector main body 92 in the same direction and at the same angle as the flexible piece portions 122 and 124 and extend integrally from the parallel extending portions 114 and 116. Yes. That is, with respect to the first flexible piece portion 122 and the second flexible piece portion 124 (the first flexible side plate 100 and the second flexible side plate 102), the receding prevention claw portion 128 having an elongated rectangular plate piece shape. However, each is formed by cutting and raising. Accordingly, each retraction preventing claw portion 128 can be flexibly deformed and elastically deformed in a direction approaching the central axis P, independently of the flexible piece portions 122 and 124.

  Protection portions 130 and 131 are integrally formed at the tips of the first and second flexible piece portions 122 and 124, respectively. As shown in FIG. 8, the protective portions 130 and 131 are integrated with the flexible pieces 122 and 124 from the tips of the flexible pieces 122 and 124 so as to have substantially the same width. The longitudinally extending rectangular flat plate has a bent plate-like overall shape that is folded back in a “U” shape inside the protector main body 92 at the tip side portion. That is, the protective portions 130 and 131 are obtuse to the flexible piece portions 122 and 124 from the distal ends of the flexible piece portions 122 and 124 to the side opposite to the arrangement side of the proximal side lateral plate 96. The first protective plate portions 132 and 133 extending obliquely toward the central axis P at an inclination angle of from the front end of the first protective plate portions 132 and 133 to the arrangement side of the proximal side lateral plate 96. The first protective plate portions 132 and 133 are integrally provided with second protective plate portions 134 and 135 extending at an acute inclination angle toward the central axis P.

  And although the 2nd protection board parts 134 and 135 and the 1st protection board parts 132 and 133 of such protection parts 130 and 131 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 134 and 135 of the protection portions 130 and 131 provided on the first and second flexible piece portions 122 and 124 are respectively allowed from the central axis P of the protector main body 92. It arrange | positions in the position separated only predetermined distance on the arrangement | positioning side of the bending piece parts 122 and 124. FIG. Further, the extension length of the first protection plate portion 132 of the protection portion 130 provided on the first flexible piece portion 122 of the first flexible side plate 100 is equal to the second flexible piece portion of the second flexible side plate 102. The extension length of the first protection plate portion 133 of the protection portion 131 provided at 124 is made longer by a predetermined dimension.

  Further, the first cover plate 132 of the protection portion 130 of the first flexible piece portion 122 is integrally formed with one side cover plate portion 136 at each edge portion on both sides in the width direction. Yes. The side lid plate portion 136 has two oblique sides having substantially the same length as the length of the first protective plate portion 132, and the angle formed by the two oblique sides is the first protective plate portion. The second protective plate portion 134 has an approximately isosceles triangular shape having a size similar to the inclination angle of the second protective plate portion 134 with respect to the second protective plate portion 132. And two side cover plate parts 136, 136 having such an isosceles triangle shape are opposed to each other on both sides in the width direction with the protective part 130 of the first flexible piece part 122 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 132 in a state where the one oblique side portion is positioned corresponding to the side surface of the first protection plate portion 132 of the protection portion 130. -ing As a result, the side opening portions that open toward both sides in the width direction of the protection portion 130 having the bent plate shape of the first flexible piece portion 122 are respectively covered by the two side cover plate portions 136 and 136. ing.

  Therefore, the first flexible piece portion 122 of the first flexible side plate 100 and the second flexible piece portion 124 of the second flexible side plate 102 approach each distal end portion to the central axis P of the protector body 92. In the direction of bending, that is, inside the protector main body 92, when it is simultaneously bent and elastically deformed, it is provided at the tip of each flexible piece 122, 124, as shown by the two-dot chain line in FIG. The protection portions 130 and 131 approach each other, and the tip of the second protection plate portion 135 of the protection portion 131 of the second flexible piece portion 124 eventually becomes the first protection of the protection portion 130 of the first flexible piece portion 122. It arrange | positions in the position just before a contact with the board part 132 or a contact. At this time, on the front end side of the front end side horizontal plate 98 of the protector main body 92, the front end side horizontal plate 98, the protection portion 130 of the first flexible piece portion 122, and the protection portion 131 of the second flexible piece portion 124, A substantially triangular prism-shaped front end side closed space 138 is formed that is surrounded by two side lid plate portions 136 and 136 provided in the protection portion 130 of the first flexible piece portion 122. In addition, on the proximal end side of the front end side horizontal plate 98 of the protector main body 92, a substantially longitudinal rectangular shape in which the periphery is surrounded by the front end side and base end side horizontal plates 96 and 98 and the four side plates 100 to 106. A proximal end side closed space 140 as a housing portion is formed.

  As shown in FIGS. 8 and 9, the first parallel side plate 104 and the second parallel side plate 106 are different from the first and second flexible side plates 100 and 102, and bend them outward of the protector body 92. Without having such a bent part, in the central axis of the protector main body 92: P direction, each flexible piece part from the arrangement side of each parallel extending part 114, 116 of the first and second flexible side plates 100, 102 It extends straight toward the 122,124 side. The first parallel side plate 104 and the second parallel side plate 106 are the first and second flexible side plates 100 in a direction perpendicular to the opposing direction of the first flexible side plate 100 and the second flexible side plate 102. , 102 are arranged to face each other with a distance substantially the same as the width of each of the first and second stopper plate portions 118, 120, with the gap therebetween. 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 116 of the second flexible side plate 102. Yes.

  And the front end side horizontal plate 98 is integrally formed at the front end of the second parallel side plate 106. The front end side horizontal plate 98 extends in a direction perpendicular to the central axis P of the protector main body 92 and is arranged so as to be bridged between the first parallel side plate 104 and the second parallel side plate 106. . In other words, the length of the second parallel side plate 106 is longer than the first parallel side plate 104 by a predetermined dimension, and the second parallel side plate 106 has the same length as the first parallel side plate 104. The tip side portion of the two parallel side plates 106 is bent at a substantially right angle inside the protector main body 92. Thus, the front end side horizontal plate 98 having a rectangular flat plate shape is formed at the bent portion of the second parallel side plate 106.

  As is apparent from FIGS. 6 to 9, one engagement protrusion 142 is integrally formed at each of the four corners of the front end side horizontal plate 98 having a rectangular flat plate shape. The engaging protrusions 142 are formed from both end portions in the longitudinal direction of the two side edge portions (side surfaces) of the distal side lateral plate 98 located on both sides of the first parallel side plate 104 and the second parallel side plate 106 in the opposing direction. , Have a plate-like small piece shape protruding integrally with the same length. That is, each of the engagement protrusions 142 is provided integrally with the front end side lateral plate 98 formed integrally with the second parallel side plate 106, and the first parallel side plate 104 and the second parallel side plate 106 are opposed to each other. From the outer surface on the opposite side to the side, the outer surface of the protector main body 92 protrudes in a direction perpendicular to the central axis P.

  On the other hand, as shown in FIGS. 5, 12, and 13, the action ring 94 extrapolated to the protector main body 92 includes a first side wall portion 144 a and a second side wall portion 144 b that are opposed to each other, and the first and first side walls. A frame shape in which a rectangular inner hole is formed by combining a third side wall portion 144c and a fourth side wall portion 114d facing each other in a direction perpendicular to the opposing direction of the two side wall portions 144a and 144b. It has a form. The distance between the opposing surfaces of the first side wall portion 144a and the second side wall portion 144b is slightly larger than the width of the first and second parallel side plates 104, 106, while the third side The distance between the opposing surfaces of the fourth side wall portions 144c and 144d is slightly larger than the width of the first and second flexible side plates 100 and 102.

  The first side wall portion 144a and the second side wall portion 144b have a substantially rectangular thick plate shape or prismatic shape. A concave groove 146 having a rectangular cross section is formed at the center of each end surface of the first and second side wall portions 144a and 144b located on one side in the axial direction of the working ring 94, and the side wall portions 144a and 144b It is formed to extend in the length direction. In other words, the two concave grooves 146 and 146 are provided on the end surface on one axial side of the working ring 94 so as to extend in the circumferential direction with an interval in the circumferential direction. Each concave groove 146 has a width and a length that allow the distal end portion of the retraction preventing claw portion 128 to enter.

  Of the four side surfaces of each concave groove 146, the side surface located on the inner hole side of the action ring 94 serves as the first engagement surface 148 and faces the first engagement surface 148. The side surface is the second engagement surface 150. In other words, the action ring 94 has a first engagement surface 148 and a second engagement surface 150 with respect to the end surfaces on both sides thereof, in the two concave grooves 146 and 146 provided on the end surface on one axial side. Correspondingly, two each are provided so as to extend in the circumferential direction at intervals in the circumferential direction.

  On the other hand, the third sidewall portion 144c and the fourth sidewall portion 144d have a rectangular flat plate shape that is thinner than the first and second sidewall portions 144a, 144b. Then, from these third and fourth side wall portions 144c and 144d, the locking ring can be elastically deformed so as to extend in the axial direction toward the opposite side of the working ring 94 from the side where the concave groove 146 is formed. The protrusion 152 is integrally formed with the action ring 94.

  The locking projection 152 includes two flat plate portions 154 and 154 at the base end portion extending from the action ring 94, and two flat plates at the tip end portion on one end surface in the axial direction. It consists of a cylindrical portion 156 that is integrally connected to the tip surfaces of the portions 154 and 154. The two flat plate portions 154 and 154 both have a long rectangular flat plate shape, and are arranged to face each other in the same direction as the opposing direction of the third and fourth side wall portions 144c and 144d.

  As will be described later, the cylindrical portion 156 has an inner diameter that allows the protector main body 92 to pass through the inner peripheral surface of the cylindrical portion 156 in a non-contact manner, that is, a size that does not interfere with the protector main body 92. It has an inner diameter. In addition, rectangular cutout portions 158 and 158 are respectively provided at two portions facing each other in the radial direction on the distal end side of the cylindrical portion 156. As a result, at the two remaining portions of the front end side portion of the cylindrical portion 156 provided with the two notches 158 and 158, it has a split cylindrical shape and is elastically deformed radially inwardly extending in the axial direction. The extended locking pieces 160, 160 are formed respectively. Further, an outer flange-like locking projection 162 is integrally provided on the outer peripheral surface of the distal end portion of each extended locking piece 160.

  And by providing the two notches 158 and 158 on the distal end side of the cylindrical portion 156, the base end side portion of the cylindrical portion 156, which is the connection side with the two flat plate portions 154 and 154, is annularly reinforced. Part 164. That is, the locking protrusion 152 extending from the action ring 94 is provided with an annular reinforcing portion 164 at an intermediate portion in the extending direction, and two flat plates are formed from one end surface of the annular reinforcing portion 164 in the axial direction. While the portions 154 and 154 face each other and extend in the axial direction, two extending locking pieces 160 and 160 face each other in the axial direction from the other axial end surface of the annular reinforcing portion 164. It extends. Thereby, even if the full length of the locking projection 152 is made sufficiently long, the free length of each extended locking piece 160 is advantageously shortened. As a result, the strength of each extended locking piece 160 and by extension, the locking projection 152 is advantageously improved.

  The material of the working ring 94 is not particularly limited. As will be described later, each flexible piece portion is inserted into the protector main body 92 and moved to the distal end side thereof. Any material may be used as long as it can bend and elastically deform 122, 124 and each retraction preventing claw portion 128 against their urging force. However, in this embodiment, the locking protrusion 152 that is preferably elastic is integrally formed with the action ring 94. Therefore, as the material for forming the action ring 94, for example, an elastic resin material, metal material, rubber material, elastomer material, or the like is appropriately used.

  As shown in FIG. 5, the action ring 94 is extrapolated to the proximal end portion of the protector main body 92. In other words, the protector main body 92 is inserted between the two flat plate portions 154 and 154 of the locking projection 152 integrally formed with the action ring 94 except for the base side portion. The protector main body 92 inserted between the two flat plate portions 154 and 154 has the first and second flexible plate portions 122 and 124 so that the first and second flexible piece portions 122 and 124 do not contact each flat plate portion 154. The flexible side plates 100 and 102 are disposed to face each other in a direction perpendicular to the facing direction of the two flat plate portions 154 and 154. Thus, the needle tip protecting protector 78 is configured as an assembly of the protector main body 92 and the action ring 94.

  As shown in FIGS. 1 and 2, proximal end portions of the inner needle 10 extending from the distal end of the inner needle hub 12 are provided on the proximal end side and distal end side lateral plates 96, 98 of the protector body 92. When the needle tip protector 78 is inserted into the first and second insertion holes 108 and 110, the needle tip protector 78 is aligned with the inner needle 10 in the direction of the needle axis (center axis P of the protector main body 92: P ) Is movably mounted. Under such a state of being attached to the inner needle 10, the needle tip protecting protector 78 is accommodated in the accommodating cylinder portion 34 of the inner needle hub 12. The protector 78 for protecting the tip of the needle housed in the housing tube portion 34 is arranged such that the action ring 94 is not in contact with or in contact with the inner peripheral surface of the housing tube portion 34, and each of the protector main bodies 92. The protection parts 130 and 131 are arranged in non-contact or contact with the inner side of the plurality of plate-like protrusions 38.

  The inner needle 10 is inserted into the outer needle 14, and the plurality of plate-like protrusions 38 of the inner needle hub 12 are inserted into the proximal end side opening 40 of the outer needle hub 16, so that the inner needle hub 12 is The needle hub 16 is assembled. As a result, an indwelling needle assembly in which the inner needle hub 12 and the outer needle hub 16 are assembled to each other is formed, and a hemostasis valve 76 and a needle tip protecting protector 78 are formed inside the indwelling needle assembly. The inner needle hub 16 and the inner needle hub 12 are incorporated in a state of being accommodated in the accommodating portion 54 and the accommodating cylinder portion 34 of the inner needle hub 12, respectively.

  Under the assembly of the inner needle hub 12 and the outer needle hub 16, the locking projection 152 of the action ring 94 of the needle tip protection protector 78 is connected to the distal end side opening 28 of the housing cylinder portion 34 of the inner needle hub 12. And extends into the accommodating portion 54 of the outer needle hub 16. Then, the locking protrusions 162 of the two extended locking pieces 160 and 160 of the locking protrusion 152 enter the annular groove 70 provided on the inner peripheral surface of the housing portion 54, and the ring The groove 70 is locked to the tapered locking surface 72.

  Since the indwelling needle assembly having the above-described structure is used for the procedure of puncturing the outer needle 14 in the blood vessel of a patient or the like and placing it, for example, when performing an infusion treatment or a blood transfusion treatment. is there. Next, a method for using the indwelling needle assembly 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 notch 84 of the hemostasis valve 76 in the accommodating portion 54 of the outer needle hub 16 is closed, and leakage of blood of the patient or the like through the outer needle 14 is prevented. Further, the needle tip protecting protector 78 attached to the inner needle 10 and accommodated in the accommodating cylinder portion 34 of the inner needle hub 12 is provided with each extended locking piece 160 in the locking projection 152 of the action ring 94. Since the locking projection 162 is locked in the annular groove 70 (tapered locking surface 72) of the accommodating portion 54, the movement is prevented. Therefore, the inner needle 10 moves backward toward the practitioner side relative to the needle tip protecting protector 78.

  Then, as shown in FIG. 14, the engagement portion 20 provided on the needle tip 18 side of the inner needle 10 is moved by the backward movement of the inner needle 10, so that the large-diameter first side plate 98 of the protector body 92 has a large diameter. When the second insertion hole 110 passes through the second insertion hole 110 and reaches the arrangement position of the proximal side lateral plate 96, the engaging portion 20 does not pass through the first insertion hole 108 having the small diameter of the proximal side lateral plate 96. , Engage with the peripheral edge of the opening. At this time, the proximal end side portion of the inner needle 10 with respect to the needle tip 18 is positioned between the opposing surfaces of the proximal side lateral plate 96 and the distal end side lateral plate 98 of the protector body 92, and the needle tip 18 is The first and second flexible piece portions 122 and 124 are positioned between the two protection portions 130 and 131 provided at the tips of the first and second flexible piece portions 122 and 124, respectively.

  When the inner needle 10 is further moved backward from the state, the protector main body 92 engaged with the engaging portion 20 of the inner needle 10 together with the inner needle 10 as shown in FIG. It moves backward toward the base end side opening 52.

  At this time, the action ring 94 extrapolated to the protector main body 92 does not move yet due to the locking of the locking protrusion 152 to the annular groove 70, and each extending locking piece of the locking protrusion 152. The locking projection 162 of 160 is maintained at the position where it enters the annular groove 70. Therefore, the protector main body 92 moves relative to the action ring 94, whereby the action ring 94 moves to the front end side of the protector main body 92 while sliding on the outer surfaces of the four side plates 100 to 106 of the protector main body 92. To do. At that time, the action ring 94 is formed on the flat inner surfaces of the first and second side wall portions 144a and 144b, and the first flexible piece portion 122 and the retraction preventing claw of the first flexible side plate 100 of the protector main body 92. The part 128 and the second flexible piece part 124 and the retraction preventing claw part 128 of the second flexible side plate 102 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 138 and the proximal end side closed space 140 are formed on the distal end side and the proximal end side of the protector main body 92. Thus, the proximal end portion of the distal end portion of the inner needle 10 relative to the needle tip 18 is positioned in the proximal end side closed space 140, and the needle tip 18 of the inner needle 10 is closed on the distal end side. It is accommodated in the space 138. As a result, the entire tip including the needle tip 18 of the inner needle 10 is covered and protected by the protector main body 92. As is clear from this, in the present embodiment, the first flexible piece portion 122 and the second flexible piece portion 124 are bent and elastically deformed in a direction approaching each other, so that the respective protective portions 130 and 131 are connected to each other. The positions where the two are brought into contact with each other are the protection positions of the protection units 130 and 131. As described above, the first parallel side plate 104 and the second parallel side plate 106 extend straight in parallel to the central axis P direction of the protector main body 66, so that the working ring 94 is relative to the protector main body 92. During the forward movement, the flat inner surfaces of the third and fourth side wall portions 144c and 144d of the action ring 94 are not pressed against the inside of the protector main body 92. Therefore, neither bending deformation nor elastic deformation is caused. It is never done.

  Then, when the action ring 94 moves to the front end side of the protector main body 92 or until such a movement is reached until the respective protection portions 130 and 131 reach a protection position that covers and protects the needle tip 18 of the inner needle 10. When the action ring 94 is further moved from the position to the front end side of the protector main body 92, as shown in FIG. 16, the end face (front end face) on the advance side of the action ring 94 located on the front end side of the protector main body 92 is Engage with four engaging protrusions 142, 142, 142, 142 integrally formed on the distal side lateral plate 98 of the protector body 92 (in FIG. 16, one engaging protrusion 142 engages with the action ring 94. Only shown). This prevents further forward movement of the action ring 94, in other words, relative movement of the protector body 92 with respect to the action ring 94 accompanying the backward movement of the inner needle 10, thereby preventing the action ring 94 from moving from the distal end side of the protector body 92. The working ring 94 can be prevented from coming off.

  At this time, as shown in FIG. 15 and FIG. 17, the action ring 94 reaches a position over the retraction preventing claw portions 128, 128 of the first and second flexible piece portions 122, 124. Then, in a state in which the deformed state of the first and second flexible piece portions 122 and 124 is maintained, only the respective backward prevention claw portions 128 are restored from the elastic deformation state, and the tip portions of the respective backward movement prevention claw portions 128 are restored. However, each of the first and second side wall portions 144a and 144b of the working ring 94 enters or fits into a recessed groove 146 provided on each rear end surface (end surface located on the base end side of the protector main body 92).

  As a result, the distal end portion of each retraction preventing claw portion 128 can be engaged with the first engagement surface 148 and the second engagement surface 150 formed by the two inner surfaces of the concave groove 146. Due to the engagement of the distal end portion of each retraction preventing claw portion 128 with the first engagement surface 148, each retraction preventing claw portion 128 becomes useless in the approaching direction to the inner needle 10 from the contact state with the action ring 94. Elastic deformation is restricted. Further, the direction in which each retraction preventing claw portion 128 is separated from the inner needle 10 from the contact state with the action ring 94 by the engagement of the distal end portion of each retraction preventing claw portion 128 with the second engagement surface 150. Unnecessarily elastic deformation is restricted. As a result, it is prevented that the contact state of each retraction prevention claw portion 128 with the action ring 94 is easily eliminated, and the action ring 94 retreats from the position where each retraction prevention claw portion 128 enters the concave groove 146. Movement is prevented.

  In addition, an unexpected external force that presses the flexible piece portions 122 and 124 to the inside of the protector main body 92 is applied, and the flexible piece portions 122 and 124 approach the inner needle 10. Further, even when further deformed and elastically deformed, the engagement of the retraction preventing claw 128 with the action ring 94 is prevented from being released. Furthermore, even if an unexpected external force is applied to each of the backlash prevention pawls 128 such that they are pressed inside the protector main body 92 or spread outward, the backlash prevention pawls 128 are not affected by the inner needle 10. It is also possible to prevent the engagement of the retraction preventing claw portion 128 from the action ring 94 by being easily bent and elastically deformed in the direction approaching or separating from the movement ring.

  Then, as shown in FIG. 18, the inner needle 10 and the protector main body 92 are further moved backward from the state where the relative movement of the action ring 94 in both the forward and backward directions with respect to the protector main body 92 is prevented. Let Then, the action ring 94 is pressed in the retracting movement direction of the protector main body 92 by the respective engagement protrusions 142 of the protector main body 92, and the tapered engagement of the annular groove 70 provided on the inner peripheral surface of the outer needle hub 16 is performed. The locking projections 162 of the extended locking pieces 160 in the locking projections 152 of the action ring 94 slide relative to the locking surface 72, and the locking projections 162 are locked to the annular groove 70. Is easily resolved. Thereby, the action ring 94 is moved backward together with the inner needle 10 and the protector main body 92. At this time, the action ring 94 remains engaged with the engagement protrusions 142 of the protector main body 92 and the retraction preventing claw portions 128, so that the flexible pieces 122 and 124 are bent by the action ring 94. The deformed and elastically deformed state, that is, the state in which the needle tip 18 of the inner needle 10 is protected by the respective protection portions 130 and 131 is maintained.

  Then, by further backward movement of the inner needle 10, the entire inner needle 10 together with the protector 78 for protecting the needle tip is protected while the needle tip 18 of the inner needle 10 is protected by the protection portions 130 and 131 of the protector body 92. Then, the outer needle hub 16 is detached from the accommodating portion 54.

  As is clear from the above description, in the indwelling needle assembly of the present embodiment, the hemostasis valve 76 is housed and disposed in the housing portion 54 of the outer needle hub 16, while the needle tip protection protector 78 is The needle hub 12 is housed and disposed in a housing tube portion 34 provided at the tip side portion. Therefore, for example, unlike the case where both the hemostasis valve 76 and the needle tip protection protector 78 are accommodated in the accommodating portion 54 of the outer needle hub 16, without increasing the total length of the outer needle hub 14, Therefore, the hemostasis valve 76 and the needle tip protection protector 78 can be accommodated and disposed inside the assembly advantageously and efficiently without increasing the size of the entire assembly.

  Therefore, according to such an indwelling needle assembly, the outer needle can be obtained without any deterioration in handling due to the increase in the size of the entire assembly or any trouble in the implementation of procedures such as artificial dialysis, infusion, and blood transfusion. The leakage of blood through 14 and the occurrence of an accidental puncture accident caused by the needle tip 18 of the inner needle 10 removed from the outer needle 14 can be extremely effectively prevented.

  The action ring 94 that is externally inserted into the protector main body 92 of the protector 78 for protecting the needle tip extends into the accommodating portion 54 of the outer needle hub 16 under the assembly of the inner needle hub 12 and the outer needle hub 16. A locking projection 152 for locking with the annular groove 70 of the housing portion 54 is integrally formed, and a predetermined movement of the protector main body 92 is achieved by the locking of the locking projection 152 with respect to the annular groove 70 of the housing portion 54. To the position, the integral movement of the action ring 94 and the protector body 92 is prevented. Therefore, the axial length of the accommodating cylinder portion 34 of the inner needle hub 12 can be advantageously increased by sufficiently extending the extension length of the locking projection 152. As a result, it is possible to secure a sufficient storage space for the protector main body 92 in the inner needle hub 12.

  In addition, since the annular reinforcing portion 164 is provided at the intermediate portion in the extending direction of the locking projection 152, the extended locking pieces 160 and 160 extending integrally from the axial end surface of the annular reinforcing portion 164 are provided. The free length is shortened and the entire locking projection 152 is reinforced. Therefore, when the locking projection 152 is made sufficiently long, it is possible to effectively prevent the locking force of the extended locking pieces 160 and 160 with respect to the annular groove 70 of the housing portion 54 from being lowered. . As a result, the storage space for the protector main body 92 in the inner needle hub 12 can be secured even more advantageously in a sufficiently large size.

  Further, a locking projection 162 is integrally formed on the outer peripheral surface of the distal end of each extended locking piece 160 of the locking projection 152, and this locking projection 162 is formed inside the housing portion 54 of the outer needle hub 16. The locking projection 152 is locked to the outer needle hub 16 by entering into an annular groove 70 provided on the peripheral surface. This provides an advantage that the locking of the locking protrusion 152 to the outer needle hub 16 is advantageously realized in a relatively simple structure. In addition, relative locking of the inner needle hub 12 and the outer needle hub 16 in the circumferential direction is not required to lock the locking protrusion 152 in the annular groove 70. As a result, the assembly work of the inner needle hub 12 and the outer needle hub 16 becomes easy.

  In the indwelling needle assembly of the present embodiment, the inner needle 10 is provided in the protector main body 92 of the needle tip protection protector 78 when the inner needle 10 to which the needle tip protection protector 78 is attached is removed from the outer needle 14. Although the two first and second insertion holes 108, 110 slide on the inner peripheral surfaces, the elastically deformed portion may contact the outer peripheral surface of the inner needle 10 with a biasing force. Absent. Therefore, when the inner needle 10 is moved backward relative to the protector body 92, 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 92. Nor.

  Further, when the action ring 94 is disposed at a predetermined advance position of the protector main body 92 due to the forward movement of the action ring 94 accompanying the relative backward movement of the inner needle 10 with respect to the protector main body 92, each flexible The pieces 122 and 124 are bent and elastically deformed, and the needle tip 18 of the inner needle 10 can be covered and protected by the protection portions 130 and 131 of the protector body 92.

  The needle tip 18 of the inner needle 10 is protected by the protection portions 130 and 131 of the protector main body 92 even during or after the removal of the inner needle 10 from the outer needle 14 or the outer needle hub 16. It has become. In such a state, even if the flexible piece portions 122 and 124 are unintentionally bent and elastically deformed toward the inner needle 10, the action ring 94 is provided with the protective portions 130 and 124. The position 131 is set unchanged from the position at which it is positioned at the protection position. Therefore, the protection state of the needle tip 18 of the inner needle 10 by the protection portions 130 and 131 can be stably maintained.

  Therefore, when the indwelling needle assembly of this embodiment is used, the needle tip 18 of the inner needle 10 is protected by the needle tip protector 78 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 18 of the inner needle 10 by the needle tip protecting protector 78 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.

  Further, the protector main body 92 is formed in a cylindrical shape having four side plates 100 to 106. Therefore, the tip portion including the needle tip 18 of the inner needle 10 can be covered and protected more reliably by the four side plates 100 to 106.

  In addition, of the four side plates 100 to 106, the first and second parallel side plates 104 and 106 do not have any flexible piece portions 122 and 124, but also the first and second stopper plate portions 118. , 120 is not easily bent or elastically deformed. Therefore, for example, after the inner needle 10 is removed, even if the protector main body 92 in which the needle tip 18 is housed is picked with a finger, etc., as long as the first and second parallel side plates 104 and 106 are picked, The protector body 92 is not easily deformed. As a result, the protection effect of the needle tip 18 of the inner needle 10 by the needle tip protector 78 can be more reliably exhibited.

  A distal side lateral plate 98 is integrally formed at the distal end portion of the second parallel side plate 106 that is not easily deformed and elastically deformed, and the center of the protector main body 92 with respect to the outer peripheral surface of the distal side lateral plate 98. A plurality of engaging projections 142 projecting in a direction perpendicular to the axis P are provided. The engagement with the plurality of engaging protrusions 142 restricts the forward movement of the action ring 94 relative to the protector main body 92 and prevents the protector main body 92 from coming out from the distal end side. ing. Therefore, for example, even after the inner needle 10 is removed, even if the protector main body 92 in which the needle tip 18 is accommodated is picked with a finger, the orientation of the plurality of engaging protrusions 142 that engage with the action ring 94 is changed. It can be advantageously prevented that the engagement state between each engagement protrusion 142 and the action ring 94 becomes unstable or disappears due to a change or the like.

  Further, since the second parallel side plate 106 is not bent or deformed by any forward movement of the action ring 94 with respect to the protector main body 92, a front end side horizontal plate 98 formed integrally with the second parallel side plate 106, and a second side plate 106 provided on the front side side plate 98 are provided. The engagement protrusion 142 is displaced inward or outward of the protector main body 92 by the relative movement of the action ring 94 with respect to the protector main body 92, and the protrusion angle of each engagement protrusion 142 with respect to the central axis P of the protector main body 92; That is, it is effective that the size of the angle formed by the central axis P and the front end surface of the action ring 94 of the engagement protrusion 142 and the contact surface (the angle indicated by α in FIG. 6) changes. Can be avoided. Thereby, for example, each engaging protrusion with respect to the central axis P of the protector body 92 regardless of the bending deformation amount and the bending angle of the flexible piece portions 122 and 124 of the first and second flexible side plates 100 and 102. The protrusion angle 142 of α: α is always a constant size. As a result, the engagement of each engagement protrusion 142 with the front end surface of the action ring 94 is stably secured, and the withdrawal of the action ring 94 from the protector body 92 can be reliably prevented. Accordingly, after the inner needle 10 is removed from the patient or the like, the protection state of the needle tip 18 of the inner needle 10 by the protection portions 130 and 131 can be maintained more stably.

  Further, the needle tip 18 is moved from the state in which the needle tip 18 of the inner needle 10 is protected by the protection portions 130 and 131 unintentionally, the needle tip 18 is moved backward, and the needle tip 18 is moved to the distal side lateral plate 98. The needle tip 18 is accommodated in the proximal-side closed space 140 even if the second insertion hole 110 is pulled out. Therefore, it is possible to prevent the projector body 92 from jumping out from the inside. Also by this, the protection state of the needle tip 18 of the inner needle 10 after the inner needle 10 is removed from the patient or the like can be ensured more stably.

  The flexible side plates 102 and 102 can be elastically deformed in addition to bending deformation. Therefore, useless bending deformation of each flexible piece part 122,124 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 130 and 131 come into contact with the outer peripheral surface of the inner needle 10 due to unnecessary bending deformation of the flexible piece portions 122 and 124, so that the inner needle 10 It is possible to effectively prevent the occurrence of excessive sliding resistance between the inner peripheral surface of 10 and the protector main body 92.

  Two second plates provided so as to be positioned coaxially with respect to the proximal side lateral plate 96 and the distal end side lateral plate 98 arranged at a predetermined distance between the proximal end side and the distal end side of the protector body 92. By inserting the inner needle 10 through the first and second insertion holes 108 and 110, the needle tip protecting protector 78 is slidably attached to the inner needle 10. Therefore, for example, as compared with the case where the inner needle 10 is inserted through only one through-hole, when the inner needle 10 is moved relative to the protector main body 92, rattling in the direction of the inner needle 10 is advantageously suppressed. Thus, the smooth movement of the inner needle 10 can be ensured.

  The distal side lateral plate 98 provided with the second insertion hole 110 is connected to the second parallel side plate 106 integrally formed with the first parallel extension plate portion 114 that is not bent and deformed by the first and second stopper plate portions 118 and 120. Is provided. Therefore, not only the base end side lateral plate 96 in which the first insertion hole 108 is formed, but also the distal end side lateral plate 98 is deformed by bending deformation of the flexible piece portions 122 and 124 accompanying the movement of the action ring 94. The relative position of the first bottom wall portion 68 and the distal side lateral plate 98, the direction of each other, and the like are not changed by the bending deformation of the flexible piece portions 122 and 124. Therefore, the positions of the first insertion hole 108 and the second insertion hole 110 do not change, so that the external insertion state of the protector body 92 to the inner needle 10, and consequently the inner needle of the protector body 92. The relative movement with respect to 10 is also stable. As a result, the diameter of each of the insertion holes 108 and 110 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 108 and 110 as much as possible. It is expected that the positioning accuracy of the protector main body 92 with respect to the needle 10 can be improved.

  The first flexible side plate 100 and the first flexible side plate 100 extending from the edge portions located on both sides of the first insertion hole 108 of the proximal side lateral plate 96 located on the proximal end side of the protector body 92 to the distal end side. A first flexible piece portion 122 and a second flexible piece portion 124 each having a protective portion 130, 131 at the tip are provided for the two flexible side plates 102, respectively. Accordingly, the needle tip 18 of the inner needle 10 is moved by the two protective portions 130 and 131 due to the bending deformation and elastic deformation of the two flexible piece portions 122 and 124 accompanying the forward movement of the action ring 94 with respect to the protector main body 92. Covered to be sandwiched from both sides. As a result, the protection of the needle tip 18 of the inner needle 10 can be more reliably performed.

  Each protection part 130,131 has the 1st protection board part 132,133 and the 2nd protection board part 134,135 integrally, and is exhibiting the bending shape folded in the shape of a "<". . As a result, even if the needle tip 18 of the inner needle 10 is protected by the respective protection portions 130 and 131, it is displaced toward the first protection plate portions 132 and 133 and the second protection plate portions 134 and 135. In order to come into contact with and engage with each of the protection plate portions 132 to 135, it is advantageous that the inner needle 10 is separated from the distal end side closed space 138 formed by the protection portions 130 and 131, which accommodates the needle tip 18. Can be prevented.

  Two side cover plate portions 136 and 136 are provided for the protective portions 130 and 131 integrally formed with the first flexible piece portion 122 to respectively close both side openings in the width direction. As a result, the needle tip 18 of the inner needle 10 is housed in the distal end side closed space 138 in a state in which all of the periphery of the inner needle 10 is surrounded, thereby protecting the needle tip 18 of the inner needle 10. Can be implemented more reliably.

  The needle tip 18 of the inner needle 10 is protected by the protection portions 130 and 131 by the engagement of the retraction preventing claw portion 128 with the first engagement surface 148 and the second engagement surface 150 provided in the action ring 94. The position of the action ring 94 with respect to the protector main body 92 is maintained. This also protects the needle tip 18 of the inner needle 10 more reliably.

  The first engagement surface 148 and the second engagement surface 150 with which the retraction preventing claw portion 128 is engaged are configured by two opposite side surfaces of the concave groove 146 provided on the end surface of the action ring 94. . For this reason, the 1st engagement surface 148 and the 2nd engagement surface 150 can be provided easily at once by only forming the ditch | groove 146 with respect to the effect | action ring 94. FIG. This contributes at least to the simplification of the structure of the working ring 94 and thus the protector 78 for protecting the needle tip and the improvement of manufacturability.

  One retraction preventing claw portion 128 is disposed on each side of the protector main body 92 with the inner needle 10 inserted through the two first and second insertion holes 108 and 110 interposed therebetween, and functions. A concave groove 146 having first and second engaging surfaces 148, 150 is provided in the ring 94 in correspondence with each retraction preventing claw portion 128. Thereby, the retraction preventing claw portion 128 can be more reliably engaged with the first and second engagement surfaces 148 and 150. As a result, the effect of preventing movement of the action ring 94 at a predetermined position with respect to the protector body 60 can be more reliably exhibited.

  A retraction preventing claw portion 128 is provided on each of the first and second flexible side plates 100 and 102 that is bent and elastically deformed by the action ring 94 that is extrapolated to the protector body 92. For this reason, for example, apart from the flexible piece portions 122 and 124, a portion that can be bent and elastically deformed by the action ring 94 is provided on the protector main body 92, and the retraction preventing claw portion 128 is provided at the portion. As compared with the case of forming, the backward movement prevention claw portion 128 can be easily formed. Moreover, the retraction preventing claw portion 128 is integrally formed by cutting and raising the flexible piece portions 122 and 124. This further facilitates the formation of the retraction preventing claw portion 128 for each of the flexible piece portions 122 and 124.

  The protector body 92 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 92 is formed by assembling or fixing various parts, the productivity of the protector main body 92, and hence the needle tip protecting protector 78 as a whole, is effectively improved. 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, the locking protrusion 152 can be formed on the action ring 94 so as to extend from one place or three or more places on the circumference thereof. Of course, the number of the extended locking pieces can be changed as appropriate.

  The locking structure of the locking protrusion to the outer needle hub is not limited to the illustrated one. For example, a step protrusion that can be locked by the locking projection of the locking protrusion may be provided on the inner peripheral surface of the housing portion of the outer needle hub instead of the locking groove. In addition, while providing a protrusion on the inner peripheral surface of the housing portion, a locking protrusion or a locking recess is provided at the tip of the locking protrusion, and the locking protrusion is locked against the protrusion of the housing It is also possible to adopt a structure that locks the convex portion and the locking concave portion.

  The protector main body 92 does not necessarily have to be accommodated entirely in the accommodating cylinder portion 34 of the inner needle hub 12, and the axial lengths of the inner needle hub 12 and the outer needle hub 16 are increased. If not, a part of the protector main body 92 may be arranged so as to extend into the accommodating portion 54 of the outer needle hub 16 through the distal end opening of the accommodating cylinder portion 34.

  In the embodiment, the protector main body 92 is formed by using one metal plate that can be elastically deformed. However, in the protector main body 92, each of the flexible piece portions 122 and 124 has flexibility. If it is, it does not necessarily have elasticity. On the other hand, the retraction prevention claw portion 128 must have elasticity. Therefore, the protector main body 92 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 92 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 92 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 main body 92, 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 are used individually or Two or more of them are combined and used as a forming material. Of course, also in the protector main body 92 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 128 is formed on the first and second flexible side plates 100 and 102 provided with the first and second flexible piece portions 122 and 124, respectively. It can also be provided on the first and second parallel side plates 104 and 106 where the flexure pieces 122 and 124 are not provided. In this case, for example, each of the first and second parallel side plates 104 and 106 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 128 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 main body 92. The method for forming the slot is not limited in any way, and can be easily formed, for example, by stamping.

  For the four side plates 100 to 106, a simple U-shaped cut is formed instead of the slot, and the portion surrounded by the cut is formed toward the outside of the protector body 92. It is also possible to form the receding prevention claw portion 128 by bending and raising it.

  The slots and cuts provided in the four side plates 100 to 106 for forming the retraction preventing claw portion 128 are not limited to the illustrated U-shape, and for example, V-shape, mountain shape, U-shape, etc. It may be a shape such as a shape.

  For example, by integrally fixing a long small piece member as a retraction prevention claw portion to a predetermined portion of the protector main body 92 such as the four side plates 100 to 106 and the base end side lateral plate 96 other than them. The retraction preventing claw portion can be provided with a structure other than cutting and raising.

  The first engagement surface 148 and the second engagement surface 150 provided on the action ring 94 are engaged with the retraction preventing claw portion 128 that is in contact with the rear end face of the action ring 94, and retreat in the direction approaching the needle 10. As long as elastic deformation of the blocking claw portion 128 is restricted, the formation position, the number of formation, 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 122 and 124 and the backward movement prevention claw portions 128 is not necessarily two. The number of the flexible piece portions 122 and 124 and the backward movement prevention claw portions 128 is 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.

  The structure of the protector for protecting the needle tip is not limited to the illustrated one. A protection body formed at the tip of the flexible piece by having a protector body and an action ring externally attached to the protector body, and the flexible piece provided in the protector body is bent and deformed by relative movement of the action ring with respect to the protector body. What is necessary is just to be comprised so that the needle tip of an inner needle can be protected in a part.

  Accordingly, as shown in FIG. 19, the first and second parallel side plates are omitted, and only the first flexible side plate 100 is provided with the first flexible piece portion 122, the retraction preventing claw portion 128, and the locking convex portion 162. The protector main body 92 can be configured by providing the protection units 130 and 131. In the needle tip protecting protector 78 having such a protector body 92, the first flexible piece 122 is deformed and elastically deformed by the relative movement of the action ring 94 with respect to the protector body 92, as shown in FIG. Thus, when the needle tip 18 of the inner needle 10 is protected by the protection portions 130 and 131, the retraction prevention claw portion 128 enters into the concave groove 146 provided on the rear end surface of the action ring 94. In this state, the action ring 94 is sandwiched between the retraction preventing claw portion 128 and the locking convex portion 162. Accordingly, unnecessary movement of the action ring 74 and inadvertent bending deformation of the first flexible piece portion 122 are prevented while the needle tip 18 of the inner needle 10 is protected by the protection portions 130 and 131. Thus, the protection state of the needle tip 18 of the inner needle 10 can be stably maintained. In addition, regarding the embodiment shown in FIGS. 19 and 20, the members and parts having the same structure as in the first embodiment are given the same reference numerals as in FIGS. The explanation was omitted.

  In addition, the structure of the hemostasis valve 76 housed in the housing portion 54 of the outer needle hub 16 is not particularly limited to the illustrated one, and any conventionally known structure can be employed.

  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. FIG. 2 is an explanatory perspective view showing a needle tip protecting protector included in the indwelling needle assembly shown in FIG. 1. FIG. 6 is an explanatory perspective view of a protector body constituting the protector for protecting the needle tip shown in FIG. 5. It is a perspective explanatory view different from FIG. 5 of the protector main body which comprises the protector for needle tip protection shown by FIG. It is front explanatory drawing of the protector main body shown by FIG. 6, Comprising: It is a figure equivalent to the VIII arrow of FIG. It is a back surface explanatory drawing of the protector main body shown by FIG. 6, Comprising: It is a figure equivalent to the IX arrow of FIG. It is XX cross-section explanatory drawing in FIG. It is XI arrow explanatory drawing in FIG. FIG. 16 is a longitudinal cross-sectional explanatory view of an action ring constituting the needle tip protecting protector shown in FIG. 5, and corresponds to the XII-XII cross section of FIG. 13. It is XIII-XIII sectional explanatory drawing in FIG. It is explanatory drawing which shows the use condition of the indwelling needle assembly which has a structure according to this invention, Comprising: The inner needle is moved backwards and the front-end | tip part is accommodated in the inside of a protector main body. It is explanatory drawing which shows another use condition of the indwelling needle assembly which has a structure according to this invention, Comprising: The protector main body was moved backward with the inner needle, and the state which protected the needle tip of the inner needle is shown. 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 portion is engaged with the first engaging surface and the second engaging surface of the working ring. FIG. FIG. 16 is an explanatory view showing another use state of the indwelling needle assembly having a structure according to the present invention, which is different from the use state shown in FIGS. 14 and 15, wherein an inner needle whose tip is protected by a protector body is shown. FIG. 2 shows a state in which the needle tip protection protector is detached from the outer needle hub. It is an isometric view explanatory drawing which shows another example of the protector for needle-tip protection which the indwelling needle assembly which has a structure according to this invention has. It is explanatory drawing which shows the usage condition of the protector for needlepoints shown by FIG. 19, Comprising: The state which protected the needlepoint of the inner needle with the protection part by the relative movement with respect to the action ring of a protector main body is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Inner needle 12 Inner needle hub 14 Outer needle 16 Outer needle hub 18 Needle tip 20 Engagement part 34 Accommodating cylinder part 54 Accommodating part 70 Annular groove 76 Hemostatic valve 78 Protector for protecting the needle point 92 Protector body 94 Acting ring 122 First possible Flexible piece portion 124 Second flexible piece portion 130 Protective portion 142 Engagement protrusion 152 Locking projection portion 160 Extended locking piece 162 Locking convex portion 164 Annular reinforcing portion

Claims (4)

An inner needle hub, an inner needle extending from the tip of the inner needle hub, a hollow outer needle hub, and a hollow outer needle extending from the tip of the outer needle hub, the inner needle being the outer needle When the distal end portion of the inner needle hub is inserted into the proximal end side opening of the outer needle hub, the inner needle hub and the outer needle hub are assembled to each other. An indwelling needle assembly,
A protector for protecting the tip of the inner needle is attached to the inner needle, and the protector for protecting the tip of the needle includes (a) an insertion portion through which the inner needle is inserted. When the inner needle is inserted into the insertion portion, the inner needle is attached to the inner needle so as to be movable in the needle axis direction and extended in the needle axis direction. A protector body that engages with an engaging portion provided on the inner needle when being removed from the needle and moves integrally with the inner needle; and (b) the penetrating through the insertion portion of the protector body. The protector body in a state where it extends toward the needle tip side at a position spaced in a direction perpendicular to the needle axis direction with respect to the inner needle, and the tip portion can be bent and deformed in a direction approaching the inner needle. And (c) the protector body on the needle tip side of the inner needle inserted through the insertion portion. When the flexible piece is bent and deformed in a direction in which the distal end of the flexible piece approaches the inner needle, the flexible piece is positioned at a protection position that covers the needle tip and protects the needle tip. A protective portion provided at the distal end of the flexure; and (d) externally movably inserted in the needle axis direction with respect to the protector body, and the flexible body is moved forward by moving forward to the distal end side of the protector body. While the piece is configured to have a working ring that bends and deforms in a direction in which the tip portion approaches the inner needle and positions the protection portion at the protection position,
A hemostasis valve that prevents the blood flowing into the outer needle hub from flowing out from the proximal-end opening through the inner hole of the outer needle when the inner needle is removed from the outer needle is provided in the outer needle. It is housed and arranged at the tip side in the hub,
Furthermore, a storage cylinder portion is provided at the distal end side portion of the inner needle hub so as to be spaced apart from the outer peripheral side of the inner needle and extend in the needle axis direction of the inner needle. The protector body mounted on the inner needle, and the action ring extrapolated to the protector body are accommodated and disposed.
A locking projection that extends into the outer needle hub is integrally formed on the working ring through the opening on the distal end side of the housing cylinder, and the locking projection is formed on the outer needle hub. When the inner needle is removed from the outer needle, the working ring is moved relative to the protector main body as the inner needle and the protector main body move together. The indwelling needle assembly is configured to move forward and to bend and deform the flexible piece to position the protection portion at the protection position.   The locking protrusion of the working ring is provided in an intermediate portion in the extending direction, and extends from the annular reinforcing portion into the outer needle hub, and does not interfere with the protector body. The indwelling needle assembly according to claim 1, further comprising a plurality of extended locking pieces that are locked to the outer needle hub.   An annular groove extending continuously in the circumferential direction is formed on the inner peripheral surface of the outer needle hub, and a locking projection protruding from the tip of the locking projection protrudes into the annular groove. The indwelling needle assembly according to claim 1 or 2, wherein the indwelling needle assembly is locked.   When the inner needle and the protector main body are further moved integrally from the state where the protection portion is located at the protection position due to the bending deformation of the flexible piece, the action ring is engaged with the action ring. Any one of Claims 1-3 in which the engagement protrusion which cancels | releases the latching with respect to the said outer needle hub of the said latching protrusion part is provided in this protector main body by moving integrally with this protector main body. The indwelling needle assembly according to claim 1.

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