WO2016152415A1

WO2016152415A1 - Catheter assembly

Info

Publication number: WO2016152415A1
Application number: PCT/JP2016/056354
Authority: WO
Inventors: 美浦学; 石田昌弘
Original assignee: テルモ株式会社
Priority date: 2015-03-25
Filing date: 2016-03-02
Publication date: 2016-09-29

Abstract

A catheter assembly (10) is provided with: a catheter (16); a catheter hub (18); an inner needle (12); a housing (14); a guide wire (22); and a guide wire operation member (24). Also, the catheter assembly (10) is provided with a projecting part (80) that releases the lock between a locking opening (48) of the housing (14) and a locking projection (96) of the guide wire operation member (24) depending on an advancing movement of the catheter hub (18). When the projecting part (80) releases the lock, the guide wire operation member (24) is moved backward with the use of a coil spring (94) so that the front end of the guide wire (22) is moved closer to the base end side than the needle tip (12a).

Description

Catheter assembly

The present invention relates to a catheter assembly that punctures and indwells a blood vessel when, for example, infusion is performed on a patient.

Conventionally, when an infusion or the like is performed on a patient, for example, a catheter assembly is used. This type of catheter assembly includes a hollow catheter, a catheter hub fixed to the proximal end of the catheter, a hollow inner needle that is inserted into the catheter and has a sharp needle tip, and a proximal end of the inner needle. And a needle hub fixed to the head. Further, for example, as disclosed in Japanese Patent Publication No. 2013-529111, in the catheter assembly, in order to facilitate insertion of the catheter into the blood vessel, the inner needle is inserted into the lumen of the inner needle so as to be slidable in the axial direction. Some have a guide wire that can protrude from the tip.

The catheter assembly of JP 2013-529111 A includes a safety member that covers the tip of the inner needle when the inner needle is removed from the catheter. However, in this catheter assembly, the distal end of the guide wire protrudes from the distal end of the inner needle when the inner needle is removed from the catheter. For this reason, even when the tip of the inner needle is protected by the safety member, the tip of the guide wire protrudes from the safety member, so that blood attached to the guide wire may be scattered. Moreover, if it is going to protect the front-end | tip of a guide wire with a safety member, it will be necessary to lengthen the full length of a safety member. As a result, the total length of the product becomes long, making it difficult for the user to use.

The present invention has been made in view of such problems, and an object thereof is to provide a catheter assembly that can prevent blood adhering to a guide wire from scattering.

In order to achieve the above object, a catheter assembly according to the present invention includes a catheter, a catheter hub that fixes and holds the catheter, and a needle tip that is removably inserted into the catheter. An inner needle, a needle hub that holds and holds the inner needle and has a first locking portion, and is inserted into the inner needle and can move relative to the inner needle and protrude from the needle tip. A guide wire, a guide wire operating member that supports the guide wire, operates a relative movement of the guide wire, and has a second locking portion that can be locked to the first locking portion; A locking portion and a releasing portion for releasing the locking of the second locking portion, and in a locked state of the first locking portion and the second locking portion, relative to the inner needle of the guide wire The movement is restricted.

According to the above, the catheter assembly is in a state in which the guide wire protrudes from the needle tip when the first locking portion and the second locking portion are locked when the guide wire is operated by the guide wire operating member. Can be maintained. Then, based on the advancement operation of the catheter hub, the release portion releases the lock between the first lock portion and the second lock portion, so that the guide wire can move relative to the inner needle. The guide wire can be retracted along with the retracting operation member. For this reason, the catheter assembly can easily draw the tip of the guide wire into the inner needle and prevent the blood adhering to the guide wire from scattering, and the user can handle the used catheter assembly well. be able to.

In this case, a biasing force that biases the guide wire operating member in the proximal direction based on the advancement in the distal direction of the guide wire is applied, and the guide wire is moved to the proximal end with respect to the inner needle along with the unlocking by the release portion. It is preferable to provide an urging mechanism that moves backward in the direction.

Thus, by providing the urging mechanism portion, the catheter assembly can automatically retract the guide wire operation member in the proximal direction by releasing the release portion. Therefore, the tip of the guide wire can be more easily pulled into the inner needle, and scattering of blood adhering to the guide wire can be prevented.

Alternatively, the guide wire operating member includes a first state in which a distal end of the guide wire is located in the inner needle and a second state in which the distal end of the guide wire protrudes from the needle tip of the inner needle. And a biasing mechanism portion that biases the guide wire operating member from the second state to the first state.

Thereby, the catheter assembly can easily switch between the exposed state and the non-exposed state of the guide wire from the inner needle in accordance with the operation of the guide wire operating member and the operation of the urging mechanism.

The urging mechanism section may be disposed between a needle holding section provided on the needle hub and the guide wire operating member.

As described above, since the urging mechanism portion is disposed between the needle holding portion and the guide wire operating member, the total length of the catheter assembly can be further shortened, which is easy for the user to use.

Furthermore, the release portion may operate in conjunction with an operation in which the catheter hub advances relative to the needle hub.

In this way, since the release portion operates in conjunction with the advancement operation of the catheter hub, there is no need to separately request an operation for retracting the guide wire, so that the operability for the user is further improved.

The release portion is preferably provided in the catheter hub accommodated inside the needle hub, or in a protector that holds the catheter hub and extends as the catheter hub advances to accommodate the inner needle. .

As described above, since the release portion is provided in the catheter hub or the protector, the catheter assembly does not need to be provided with another member, so that the structure is simplified, and the assembly work can be made more efficient. Manufacturing cost can be reduced.

Here, a plurality of the first locking portions may be provided along the longitudinal direction of the needle hub.

As described above, the catheter assembly includes a plurality of first locking portions in the longitudinal direction of the needle hub, whereby the amount of protrusion of the guide wire from the needle tip can be adjusted stepwise.

The first locking portion is an opening that communicates with the inside of the needle hub, and the second locking portion is a protrusion that is inserted into the opening and hooked to the lip of the opening. Good.

In this way, the detachable locking state can be satisfactorily configured at the position where the guide wire operating member has advanced by using the first locking portion as the opening and the second locking portion as the protrusion. it can.

Furthermore, it is preferable that the release part releases the locking by pushing up the protrusion inserted into the opening part from the inside of the needle hub as the catheter hub advances.

Thus, in the catheter assembly, the release portion pushes up the protrusion from the inside, so that the protrusion can be easily detached from the opening.

Furthermore, the release portion may be formed longer in the longitudinal direction than the interval between two adjacent openings in the plurality of openings.

In this way, the release part is formed long in the longitudinal direction, so that when the locking of the protrusion from one opening is released, it is ensured that the protrusion enters the other opening. Can be blocked. Therefore, the guide wire operating member can be favorably retracted in the proximal direction.

Alternatively, the releasing part may be configured to disengage the first locking part from the second hub by moving the first locking part to the inside of the needle hub as the catheter hub advances.

Thus, by displacing the first locking portion to the inside of the needle hub and releasing the locking with the second locking portion, the guide wire operating member is retracted more smoothly in the proximal direction, The tip of the guide wire can be drawn into the inner needle.

According to the present invention, the catheter assembly can prevent the blood adhering to the guide wire from scattering by automatically retracting the guide wire from the needle tip when the inner needle is removed from the catheter. it can.

It is a perspective view which shows the catheter assembly which concerns on 1st Embodiment of this invention. 2A is a schematic side cross-sectional view of the catheter assembly of FIG. 1, and FIG. 2B is a schematic side cross-sectional view of the catheter assembly showing a protruding state of the guide wire. FIG. 3A is a schematic side cross-sectional view of the catheter assembly when the catheter hub is moved, and FIG. 3B is a schematic side cross-sectional view of the catheter assembly showing a retracted state of the guide wire. FIG. 2 is an exploded perspective view of the catheter assembly of FIG. 1. FIG. 5A is a first explanatory view showing a locked state of the first and second locking portions, and FIG. 5B is a second explanatory view showing a locked state following FIG. 5A. 6A is a third explanatory view showing a locked state following FIG. 5B, FIG. 6B is a fourth explanatory view showing a locked state following FIG. 6A, and FIG. 6C is a locked view following FIG. 6B. It is 5th explanatory drawing which shows a state. It is a schematic side sectional view showing a catheter assembly according to a first modification. 8A is a first side cross-sectional view schematically showing a catheter assembly according to a second modification, and FIG. 8B is a second side cross-sectional view showing the operation of the catheter assembly following FIG. 8A. 8C is a third side cross-sectional view illustrating the operation of the catheter assembly following FIG. 8B. 9A is a first side cross-sectional view schematically showing a catheter assembly according to a third modification, and FIG. 9B is a second side cross-sectional view showing the operation of the catheter assembly following FIG. 9A. 9C is a third side cross-sectional view illustrating the operation of the catheter assembly following FIG. 9B. FIG. 10A is a side sectional view schematically showing a catheter assembly according to the second embodiment, and FIG. 10B is a side sectional view schematically showing a catheter assembly according to a fourth modification.

Hereinafter, preferred embodiments (first and second embodiments) of the catheter assembly according to the present invention will be described and described in detail with reference to the accompanying drawings.

[First Embodiment]
The catheter assembly 10 according to the first embodiment is an indwelling needle that is applied when transfusion, blood transfusion, or the like is performed on a patient (living body), and that is punctured and placed in the patient's body to serve as an introduction unit for a medical solution or the like. In particular, the catheter assembly 10 has a function of delivering a guide wire 22 through the inside of the inner needle 12 as shown in FIG. 1 in order to improve the workability of users such as doctors and nurses.

The catheter assembly 10 can be configured as a catheter having a longer length than the peripheral venous catheter (for example, a central venous catheter, a PICC, a midline catheter, etc.). The catheter assembly 10 may be configured as a peripheral venous catheter. The catheter assembly 10 is not limited to a venous catheter, and may be configured as an arterial catheter such as a peripheral artery catheter.

The catheter assembly 10 includes an inner needle 12, a housing 14 (needle hub), a catheter 16, a catheter hub 18 (see FIG. 2A), a catheter operating member 20, a guide wire 22 (see FIG. 2A), a guide wire operating member 24, and a protector. 26 (see FIG. 2A).

In the initial state before use, the catheter assembly 10 has an inner needle 12 and a catheter 16 which are overlapped and protrude from the distal end of the housing 14, and the guide wire 22 is extended to the proximal end side of the needle tip 12 a in the inner needle 12. It is in the inserted state. 2A, a catheter hub 18, a proximal end portion of the catheter 16, a catheter operating member 20, a guide wire operating member 24, and a protector 26 are accommodated in the housing 14. As shown in FIG.

When using the catheter assembly 10, the user grasps the housing 14 and punctures the inner needle 12 and the tip of the catheter 16 into the blood vessel (vein or artery) of the patient. Further, while maintaining this puncture state, the user advances the guide wire operating member 24 relative to the housing 14 in the distal direction as shown in FIG. Send it out. The guide wire 22 delivered from the needle tip 12a enters the blood vessel.

Thereafter, the user advances the catheter hub 18 relative to the housing 14 to further advance the catheter 16 further to the distal end side (that is, the inner part of the blood vessel) than the inner needle 12. At this time, the catheter 16 is inserted into the blood vessel along the guide wire 22 that has previously entered the blood vessel.

As the catheter hub 18 moves forward (or the housing 14 retracts relative to the catheter hub 18), the protector 26 holding the catheter hub 18 extends as shown in FIG. 3A. Here, when the catheter hub 18 is advanced, the catheter assembly 10 automatically retracts the guide wire 22 delivered from the needle tip 12a as shown in FIG. 3B, so that the inside of the inner needle 12 (that is, the protector 26). Inside).

The protector 26 accommodates the inner needle 12 when the advancement operation continues and becomes sufficiently long in the axial direction. As a result, the protector 26 prevents the inner needle 12 from being exposed to the outside, and prevents false puncture, blood contamination, and the like. Further, the protector 26 releases the holding of the catheter hub 18 to place the catheter 16 and the catheter hub 18 on the patient. Hereinafter, the catheter assembly 10 will be specifically described.

As shown in FIGS. 1 and 4, the inner needle 12 of the catheter assembly 10 is configured as a hollow tubular body having rigidity capable of puncturing a living body skin. A sharp needle tip 12 a is formed at the tip of the inner needle 12. A through hole 30 is provided in the inner needle 12 along the axial direction. The through hole 30 has a distal end opening 30 a provided in the needle tip 12 a and a proximal end provided at the proximal end of the inner needle 12. It communicates with the opening 30b (see FIG. 2A). In addition, you may provide a groove part in the outer peripheral surface of the inner needle 12 along an axial direction.

The inner needle 12 is firmly fixed to the housing 14 by an appropriate fixing method (fusion, adhesion, insert molding, etc.). Examples of the constituent material of the inner needle 12 include stainless steel, aluminum or aluminum alloy, metal material such as titanium or titanium alloy, hard resin, ceramics, and the like.

The housing 14 is formed in a cylindrical shape having a thickness and a length that can be easily gripped by the user. A plurality of ribs 14 a that circulate in the circumferential direction are formed on the outer peripheral surface from the vicinity of the front end of the housing 14 to the intermediate portion in the axial direction so that the user can easily grasp the housing 14. The housing 14 includes a housing body 32 having an internal space 32a, and a needle holding portion 34 that holds the inner needle 12 and is disposed in the internal space 32a (see also FIG. 2A).

The housing main body 32 has an elongated cylindrical shape formed by a lower wall 36, a rear wall 38, a pair of side walls 40, and an upper wall 42, and an internal space 32a is formed inside. The front end side of the lower wall 36 is gently inclined upward toward the front end direction to shallow the internal space 32a. A guide groove (not shown) for guiding the relative movement of the protector 26 is provided on the upper surface of the lower wall 36.

Further, the rear wall 38 and the pair of side walls 40 are connected to the side portion of the lower wall 36 and protrude upward. A groove (not shown) for assembling the upper wall 42 of another member is formed inside and above the rear wall 38 and the pair of side walls 40. Further, a cutout portion 40 a into which the lateral operation portion 62 of the catheter operation member 20 is inserted is formed on the distal end side of the pair of side walls 40.

The upper wall 42 has a length in the longitudinal direction shorter than that of the lower wall 36 and the side wall 40, and extends from the rear wall 38 to a position slightly ahead of the axial middle portion of the housing body 32. The upper wall 42 has a pair of slits 44 for passing a wire holding wall 88 of the guide wire operating member 24 described later through the internal space 32a, and a first locking portion 46 for locking the guide wire operating member 24.

The pair of slits 44 extend linearly from the base end of the upper wall 42 toward the distal end and parallel to each other. The width of the slit 44 is set so as to pass through a pair of support portions 92 described later in a slidable manner. The formation range of the slit 44 substantially matches the distance from the rear wall 38 of the housing 14 to the proximal end surface of the needle holding portion 34.

On the other hand, the first locking portion 46 is configured by a locking opening 48 that communicates the outside of the upper wall 42 and the internal space 32a in plan view. The locking openings 48 are formed in a square shape in plan view, and a plurality (four in the illustrated example) are provided along the longitudinal direction of the upper wall 42. The four locking openings 48 are provided at equal intervals within a range corresponding to the longitudinal length of the slit 44. Hereinafter, regarding the four locking openings 48, reference numerals A to D are given in order from the distal end of the upper wall 42 to the base end, and may be referred to as first to fourth locking openings 48A to 48D.

The lip of the upper wall 42 constituting the locking opening 48 is a tapered portion 50 that narrows the opening area from the upper surface toward the lower surface over the entire circumference in the circumferential direction (see also FIG. 5A). In other words, the locking opening 48 has the widest gap between the upper edges (upper edges 50a) and the smallest gap between the lower edges (lower edges 50b).

As shown in FIG. 4, the needle holding portion 34 is formed in a rectangular block, and the proximal end of the inner needle 12 is attached to a hollow inner needle fixing portion 34 a provided at the top and bottom of the needle holding portion 34 and in the center in the width direction. Insert the part and hold it firmly. The needle holding portion 34 is firmly fixed to the lower wall 36 and the upper wall 42 by a fixing method such as adhesion or fusion.

As shown in FIG. 2A, a fixed-side spring arrangement portion 52 for arranging a coil spring 94 described later is provided on the proximal end side of the needle holding portion 34. The fixed-side spring placement portion 52 is formed in a depressed recess in order to place the tip of the coil spring 94 without shaking. An inner needle fixing portion 34 a communicates with the center portion of the fixed-side spring arrangement portion 52, and the proximal end opening 30 b of the fixed inner needle 12 faces the fixed-side spring arrangement portion 52. For this reason, the guide wire 22 is inserted into the through hole 30 from the proximal end side of the fixed-side spring arrangement portion 52.

The housing 14 (housing main body 32, needle holding portion 34) is preferably made of a relatively hard material so that the user can easily operate it. The constituent material of the housing 14 is not particularly limited. For example, a thermoplastic resin such as polypropylene, polycarbonate, polyamide, polysulfone, polyarylate, and methacrylate-butylene-styrene copolymer may be preferably used.

The catheter 16 of the catheter assembly 10 is formed into a tube body that is more flexible than the inner needle 12. Inside the catheter 16, an inner needle 12 is accommodated, and a lumen 16a through which a drug solution, blood, and the like can flow is formed so as to penetrate along the axial direction. The length of the catheter 16 is not particularly limited, and is appropriately set according to the application, various conditions, and the like. The length of the catheter 16 is, for example, set to about 20 to 500 mm, or set to about 30 to 400 mm, or set to about 100 to 300 mm.

The constituent material of the catheter 16 is not particularly limited, but a soft resin material is suitable, for example, polytetrafluoroethylene (PTFE), ethylene-tetrafluoroethylene copolymer (ETFE), perfluoroalkoxy fluororesin. Fluorine resins such as (PFA), olefin resins such as polyethylene and polypropylene, or a mixture thereof, polyurethane, polyester, polyamide, polyether nylon resin, a mixture of the olefin resin and an ethylene / vinyl acetate copolymer, etc. can give.

The proximal end portion of the catheter 16 is fixed to the distal end portion in the catheter hub 18 by an appropriate fixing method (caulking, fusing, bonding, etc.). The catheter hub 18 is exposed on the patient's skin in a state where the catheter 16 is inserted into the blood vessel, and is affixed with a tape or the like and placed with the catheter 16.

The catheter hub 18 is made of a material harder than the catheter 16 and is formed in a cylindrical shape tapered in the distal direction. For the catheter hub 18, for example, the material described in the housing 14 may be appropriately adopted. After the inner needle 12 is detached, an infusion tube connector (not shown) is connected to the proximal end side of the catheter hub 18.

As shown in FIG. 4, a hollow portion 18 a that is in communication with the lumen 16 a of the catheter 16 and through which an infusion solution can be circulated is provided inside the catheter hub 18. The hollow portion 18a may contain a hemostasis valve, a plug, etc. (not shown) that prevent backflow of blood when the inner needle 12 is punctured and enables infusion with insertion of a connector of an infusion tube. Further, a ring-shaped flange portion 54 is formed to project from the outer peripheral surface of the proximal end side of the catheter hub 18. Further, a pair of connection protrusions 56 to which the catheter operating member 20 is rotatably connected are formed on the outer peripheral surface of the catheter hub 18.

The catheter operation member 20 is attached to the upper side of the catheter hub 18 so that the user operates the catheter 16 and the catheter hub 18 to advance and retract. The catheter operating member 20 has a body portion 58 extending in the axial direction formed in a flat plate shape. A pair of connection pieces 60 that can be attached to and detached from the pair of connection projections 56 are provided at the base end portion of the body portion 58, and an upper operation for the user to operate the catheter operation member 20 at the distal end portion of the body portion 58. A unit 61 and a side operation unit 62 are provided.

The connection piece 60 is formed in a C shape in a side view, and the engagement with the connection protrusion 56 is held in a state parallel to the axial direction of the catheter hub 18, so that the catheter operation member 20 from the catheter hub 18 is held. Separation is prevented. On the other hand, due to a change in the angle of the catheter operating member 20 with respect to the catheter hub 18 (for example, the catheter operating member 20 faces perpendicular to the axial direction of the catheter hub 18), the connection protrusion 56 and the connection piece 60 are engaged. Canceled. Thereby, the catheter operating member 20 can be separated from the catheter hub 18.

As shown in FIGS. 2A and 4, the protector 26 has a plurality (three in this embodiment) of cylinders, and in an initial state, the cylinders are coaxially overlapped to form a shortened state (multiplex structure). Presented and accommodated in the internal space 32a of the housing 14. In this state, the distal end portion of the protector 26 locks the catheter hub 18. When the inner needle 12 is removed (extracted) from the catheter 16, each cylindrical body extends and extends stepwise in a distal direction, and the inner needle 12 is accommodated therein (see also FIG. 3B), and the protector 26. The distal end of the catheter unlocks the catheter hub 18. Hereinafter, the inner cylinder 64, the first relay cylinder 66, and the second relay cylinder 68 are referred to in order from the cylindrical body positioned at the tip during extension.

An inner cylinder 64 of the protector 26 is formed in a box shape and has a block accommodating portion 70 having a hollow portion 70a penetrating vertically, a block member 72 movably accommodated in the hollow portion 70a, and a tip from the block accommodating portion 70 A head portion 74 projecting short in the direction, a pair of engaging arms 76 projecting in the distal direction from both side surfaces of the block housing portion 70 and elastically deformable, and an extending cylindrical portion projecting in the proximal direction from the block housing portion 70 78.

In the initial state, the block member 72 is disposed on the lower side of the hollow portion 70a with the upward displacement restricted by the inner needle 12 passing through the hollow portion 70a, and is provided on the block member 72 and the housing body 32. The inner cylinder 64 is prevented from moving relative to the housing body 32 in the distal direction under a contact action with an inclined guide surface (not shown). When the distal end of the inner needle 12 moves to the proximal end side with respect to the block member 72 as the inner needle 12 is removed from the catheter 16, the block member 72 can be lifted so that the inner cylinder 64 moves relative to the housing body 32. Relative movement is possible in the tip direction. When the inner cylinder 64 advances relative to the housing main body 32, the block member 72 is guided by the guide surface of the housing main body 32, moves upward, and is locked at an appropriate height. The block member 72 is opposed to the needle tip 12a accommodated in the extending cylindrical portion 78 at the locking position, thereby preventing the inner needle 12 from being exposed from the tip of the protector 26.

The head 74 is detachably inserted and fitted into the hollow portion 18a of the catheter hub 18. In the initial state of the catheter assembly 10, the engagement arm 76 is housed in the housing body 32 with its tip engaged with the flange portion 54 of the catheter hub 18, and is prevented from opening. When the inner cylinder 64 moves relative to the housing body 32 in the distal direction, the engagement arm 76 protrudes from the distal end of the side wall 40 and opens, whereby the engagement of the engagement arm 76 with the catheter hub 18 is released, The protector 26 including the tube 64 can be detached from the catheter hub 18.

The extended cylinder part 78 is formed so as to penetrate the inner needle 12 so as to be slidable, and has an inner cylinder side accommodation space 78a communicating with the cavity part 70a. Further, an outer cylinder-side outer convex portion 78b is formed on the outer peripheral surface of the proximal end side of the extending cylinder portion 78 so as to protrude outward.

The first relay cylinder 66 has a first relay cylinder side accommodation space 66a formed so as to penetrate the extended cylinder portion 78 so as to be slidable. A ring-shaped first relay cylinder side inward convex portion 66b protrudes inward from the inner peripheral surface of the front end side of the first relay cylinder side accommodation space 66a. When the inner cylinder 64 advances relative to the first relay cylinder 66 at the time of detachment, the first relay cylinder-side inner protrusion 66b hooks the inner cylinder-side outer protrusion 78b to prevent it from coming off. Further, a first relay cylinder side outer convex portion 66c is formed on the outer peripheral surface of the proximal end side of the first relay cylinder 66 so as to protrude outward.

The second relay cylinder 68 has a second relay cylinder-side accommodation space 68a formed so as to penetrate the first relay cylinder 66 so as to be slidable. A ring-shaped second relay cylinder side inner convex portion 68b protrudes inward from the inner peripheral surface of the distal end side of the second relay cylinder side accommodation space 68a. The second relay cylinder side inner convex portion 68b prevents the first relay cylinder side outer convex portion 66c from coming off when the first relay cylinder 66 advances relative to the second relay cylinder 68 at the time of separation. .

Further, on the outer peripheral surface of the second relay cylinder 68, a protruding portion 80 (release portion 79) is formed protruding upward. The protrusion 80 extends linearly from a position where the tip of the second relay cylinder 68 is spaced to the base end of the second relay cylinder 68. The tip of the ridge 80 is formed on a tip inclined surface 80 a that is inclined obliquely upward toward the proximal direction of the second relay cylinder 68. Further, the base end of the protrusion 80 is formed on a base end inclined surface 80 b that is inclined obliquely downward toward the base end direction of the second relay cylinder 68. In other words, the protrusion 80 has a trapezoidal shape in a side view.

Furthermore, a guide protrusion 82 is formed on the outer peripheral surface of the base end side of the second relay cylinder 68 so as to protrude downward. The guide protrusion 82 is inserted and guided in a guide groove (not shown) of the housing main body 32 and comes into contact with the leading edge of the guide groove when the second relay cylinder 68 is advanced, so that the second relay cylinder 68 is removed from the housing 14. To prevent.

As shown in FIGS. 1 and 4, the guide wire operating member 24 is formed as a lid-like member that covers the upper surface of the housing 14 (upper wall 42). The guide wire operating member 24 includes an extended plate portion 84 formed in a flat plate shape, an operation protrusion 86 protruding upward from the upper surface on the distal end side of the extended plate portion 84, and a proximal end side of the extended plate portion 84. And a wire holding wall 88 protruding downward from the lower surface.

The extending plate portion 84 is formed in a rectangular shape having a length substantially the same as the length in the longitudinal direction of the upper wall 42 of the housing body 32 and a length in the short direction that can be accommodated between the pair of side walls 40. Since the extending plate portion 84 is sufficiently long in the longitudinal direction, the distal end side can be easily elastically deformed in the vertical direction with respect to the base end (wire holding wall 88). A plurality of ribs 14 a are provided along the width direction in a range of the upper surface of the extended plate portion 84.

The wire holding wall 88 protrudes in a direction orthogonal to the surface direction of the extending plate portion 84 and is inserted into the internal space 32a from the outside of the housing 14. An insertion port 88 a through which the wall between the pair of slits 44 of the upper wall 42 can be inserted is formed in a portion of the wire holding wall 88 that is continuous with the extending plate portion 84. A flat plate wall 90 having a movable spring arrangement portion 90a is provided below the insertion port 88a, and a pair of support portions 92 that support the flat plate wall 90 are provided on both sides in the width direction of the insertion port 88a. It is done.

The movable-side spring arrangement portion 90a is formed in a recessed portion where the coil spring 94 is arranged, and a wire fixing portion 90b for fixing the guide wire 22 is provided in the flat plate wall portion 90 at the center. The guide wire 22 is firmly fixed to the wire fixing portion 90b by an appropriate fixing method (fusion, bonding, insert molding, etc.) and protrudes from the front end surface of the flat plate wall portion 90 in the front end direction. In addition, the structure of the fixed side and movable side spring arrangement | positioning

parts

52 and 90a is not specifically limited, The groove | channel and protrusion which match the diameter of the coil spring 94 may be sufficient.

The pair of support portions 92 are disposed in the slit 44 of the housing 14 in the assembled state of the guide wire operating member 24, and the flat plate wall portion 90 is opposed to the needle holding portion 34 in the internal space 32a. Then, the operating force when the user advances the operation protrusion 86 of the extended plate portion 84 is transmitted to the flat wall portion 90, and the flat plate wall portion 90 is advanced to elastically contract the coil spring 94. .

The coil spring 94 is formed by winding a wire in a spiral shape, and is configured as an urging mechanism portion 93 that contracts when the guide wire operation member 24 advances and urges the guide wire operation member 24 in the proximal direction. The coil spring 94 has a hollow 94a through which the guide wire 22 is passed along the axial direction. In the normal state, the coil spring 94 is set to an axial length corresponding to the distance between the fixed-side spring arrangement portion 52 of the needle holding portion 34 and the movable-side spring arrangement portion 90a of the wire holding wall 88. The coil spring 94 has a relatively weak spring force, and applies an appropriate biasing force to the wire holding wall 88 while maintaining the engagement between the guide wire operating member 24 and the housing 14 in a contracted state.

Further, as shown in FIG. 5A, a locking projection 96 (second locking portion 95) that is inserted and locked into the locking opening 48 is integrally formed on the lower surface of the extending plate portion 84. . The locking protrusion 96 protrudes downward with a protrusion amount larger than the plate thickness of the upper wall 42. For this reason, the protruding end of the locking protrusion 96 penetrates the locking opening 48 from the outside of the upper wall 42 and is inserted into the internal space 32a.

The locking projection 96 includes a tip tapered surface 96a that is inclined downward with respect to the surface direction of the extending plate portion 84, and a projection surface 96b that is continuous with the base end of the tip tapered surface 96a and is parallel to the surface direction. A first base end tapered surface 96c that is continuous with the base end of the projecting surface 96b and is inclined upward with respect to the surface direction; and a base end of the first base end tapered surface 96c that is orthogonal to the surface direction. The locking surface 96d extends, and the second base end tapered surface 96e is connected to the upper end of the locking surface 96d and is inclined upward with respect to the surface direction.

The inclination angle of the distal tapered surface 96a is set to be the same as the inclination angle of the tapered portion 50 on the distal end side of the locking opening 48 and the proximal inclined surface 80b of the protrusion 80 of the second relay cylinder 68 (protector 26). Has been. The inclination angles of the first and second proximal

tapered surfaces

96c, 96e are set to be the same as the inclination angles of the tapered portion 50 on the proximal end side of the locking opening 48 and the distal inclined surface 80a of the protrusion 80. ing.

The distance between the tip tapered surface 96a and the locking surface 96d is slightly longer than the distance between the lower edge 50b of the tapered portion 50 in the locking opening 48. For this reason, in a state in which the locking projection 96 is inserted into the locking opening 48, the locking surface 96d is locked to the lower edge 50b of the tapered portion 50 (appropriate against the spring force of the contracted coil spring 94). Get caught by force. Therefore, the locking projection 96 is prevented from coming off from the locking opening 48. On the other hand, when the user picks up the operation protrusion 86 and lifts the extension plate portion 84 upward, the locking protrusion 96 that is in line contact with the lower edge 50b of the locking opening 48 is easily removed, The locked state is released.

As shown in FIGS. 4 and 5A, the first to fourth locking openings 48A to 48D are formed in the same shape, and the locking protrusion 96 is inserted into the fourth locking opening 48D in the initial state. ing. Then, by the user's advance operation of the guide wire operating member 24, it is selectively inserted and locked into the first to third locking openings 48A to 48C. When the guide wire operating member 24 is advanced, the guide wire 22 fixed to the wire holding wall 88 is also advanced and protrudes from the needle tip 12a, and the locking protrusion 96 to the first to third locking openings 48A to 48C. The amount of protrusion is adjusted and maintained by selective locking.

In the catheter assembly 10 described above, in the initial state shown in FIG. 1, the inner needle 12 exposes the needle tip 12 a through the inside of the protector 26, the hollow portion 18 a of the catheter hub 18, and the lumen 16 a of the catheter 16. Yes. In this state, the protector 26 in which the extending cylinder part 78 of the inner cylinder 64 and the first and

second relay cylinders

66 and 68 overlap is accommodated on the distal end side of the needle holding part 34 of the internal space 32a of the housing 14. Yes. In the protector 26, the catheter hub 18 is externally fitted to the head 74 of the inner cylinder 64, and the flange portion 54 is locked by a pair of engagement arms 76 pressed against the housing 14.

Further, the guide wire operating member 24 has the side wall 40 together with the upper wall 42 in a state where the pair of support portions 92 are inserted into the pair of slits 44 of the upper wall 42 and the flat plate wall portion 90 is disposed below the upper wall 42. It is inserted into the groove. Thereby, the flat wall part 90 is arrange | positioned in the internal space 32a. Then, the extending plate portion 84 of the guide wire operating member 24 is placed on the upper surface of the housing 14 by inserting and locking the locking projection 96 into the fourth locking opening 48D (first state: See also FIG. 5A). At this position, the wire holding wall 88 holding the guide wire 22 is sufficiently separated from the needle holding portion 34, and the tip of the guide wire 22 is disposed in the through hole 30 near the needle tip 12 a of the inner needle 12. . Further, a coil spring 94 is interposed between the needle holding portion 34 and the wire holding wall 88, and the guide wire 22 is inserted into the through hole 30 through the hollow 94 a of the coil spring 94.

The catheter assembly 10 according to the present embodiment is basically configured as described above, and the effects thereof will be described below.

As described above, the catheter assembly 10 is used when constructing an infusion part for an infusion to a patient. In using the catheter assembly 10, the user grasps the housing 14 to puncture the inner needle 12 and the catheter 16 from the patient's body surface into the blood vessel. While maintaining this puncture state, the user advances the guide wire operation member 24 in the distal direction relative to the housing 14.

At this time, the user picks up the operation protrusion 86 of the guide wire operation member 24 and lifts the distal end side of the extending plate portion 84 upward, so that the locking protrusion 96 and the fourth locking opening 48D are locked. Release and move in the tip direction. As the extending plate portion 84 moves, the proximal-side wire holding wall 88 also advances integrally, and the guide wire 22 protrudes from the needle tip 12a of the inner needle 12 according to the advancement distance. As the wire holding wall 88 advances, the coil spring 94 also elastically contracts. Then, the user inserts the locking projection 96 into any of the first to third locking openings 48A to 48C, and maintains the protruding state (second state) of the guide wire 22 from the needle tip 12a. To do. Hereinafter, a case where the locking projection 96 is inserted into the first locking opening 48A will be described (see FIGS. 2B and 5B).

After projecting the guide wire 22 from the needle tip 12a, the user operates the catheter operating member 20 to move the catheter 16 and the catheter hub 18 relative to the housing 14 (the housing 14 may also be retracted in the proximal direction). Included). As a result, the catheter 16 is smoothly inserted into the blood vessel along the guide wire 22. As the catheter hub 18 advances, the protector 26 extends in the axial direction as shown in FIG. 3A.

When the protector 26 is extended, the guide projection 82 of the second relay cylinder 68 is in contact with the guide groove of the housing 14 with an appropriate frictional resistance, so that the inner cylinder 64 advances first, and then the first relay cylinder. 66 advances, and finally the second relay cylinder 68 advances in the distal direction. Note that the protruding surface 96b of the locking protrusion 96 is disposed in a non-contact manner with respect to the peripheral wall of the second relay cylinder 68 and can smoothly advance the second relay cylinder 68. Then, when the second relay cylinder 68 advances to the distal end side of the housing 14, the protrusion 80 comes into contact with the locking protrusion 96 of the guide wire operating member 24 as shown in FIG. 6A.

Specifically, the tip inclined surface 80a of the protrusion 80 and the first base end tapered surface 96c of the locking protrusion 96 first contact each other, and guide the locking protrusion 96 upward along the mutual inclined shape. (See FIG. 6B). Then, when the locking projection 96 comes out of the first locking opening 48A with the upper surface of the protruding portion 80 facing the protruding surface 96b, the guide wire operating member 24 is biased (elastic restoring force) of the coil spring 94. And automatically retracts in the proximal direction (see FIG. 6C). At the time of retreat, the protrusion 80 which is long in the axial direction is present below the second and

third locking openings

48B and 48C, so that the locking protrusions to the second and

third locking openings

48B and 48C are present. Locking of the portion 96 is restricted.

As a result, the wire holding wall 88 retreats to a position (initial position) where it contacts the rear wall 38 of the housing 14 and is reinserted into the fourth locking opening 48D in which the locking projection 96 is open. . In this state, the distal end of the guide wire 22 is retracted to the initial state position proximal to the needle tip 12a.

Further, in the catheter assembly 10, when the inner cylinder 64 is advanced in the distal direction relative to the housing 14, the pair of engagement arms 76 are detached from the housing 14 to release the engagement of the catheter hub 18, and the protector 26 and the catheter The hub 18 is detached. Further, the block member 72 moves upward in the hollow portion 70a and is locked at a position facing the needle tip 12a of the inner needle 12, thereby preventing the inner needle 12 from being exposed.

As described above, in the catheter assembly 10 according to the first embodiment, when the guide wire operating member 24 is advanced, the guide wire 22 is brought into contact with the needle tip 12a by the locking projection 96 and the locking opening 48. It can be set as the state which protruded from. Then, the guide wire 22 is movable relative to the inner needle 12 by releasing the locking of the locking protrusion 96 and the locking opening 48 by the protruding portion 80 based on the movement of the catheter hub 18 to advance. Therefore, the guide wire 22 can be retracted along with the retraction of the guide wire operating member 24. For this reason, the catheter assembly 10 can easily pull the tip of the guide wire 22 into the inner needle 12 to prevent the blood adhering to the guide wire 22 from being scattered, and handle the device after use well. Is possible.

Further, since the catheter assembly 10 includes the coil spring 94, the guide wire operating member 24 can be automatically retracted in the proximal direction by releasing the locking of the protrusion 80. Therefore, the tip of the guide wire 22 can be pulled into the inner needle 12 more easily, and scattering of blood adhering to the guide wire 22 can be prevented. Furthermore, the catheter assembly 10 has the coil spring 94 disposed between the needle holding portion 34 provided in the housing 14 and the wire holding wall 88 of the guide wire operating member 24, so that the total length of the product is further shortened. It is easy to use.

In this case, by providing the protector 26 with the protruding portion 80 that releases the locking, the catheter assembly 10 does not need to be provided with another member. Therefore, the structure is simplified, and the assembly work can be made more efficient. Manufacturing cost can be reduced. Further, since the protrusion 80 operates in conjunction with the advancement operation of the catheter hub 18, there is no need to separately request an operation for retracting the guide wire 22, and the operability for the user is further improved. Note that the release portion 79 may be provided in the catheter hub 18. Further, the release portion 79 may be configured as a separate member that is movably disposed with respect to the housing 14. In this case, the member provided with the release portion 79 may be interlocked with the advance operation of the catheter 16 or the catheter hub 18 with respect to the housing 14.

Further, the catheter assembly 10 includes the first to fourth locking openings 48A to 48D in the longitudinal direction of the housing 14, so that the protruding amount of the guide wire 22 from the needle tip 12a can be adjusted stepwise. it can. Furthermore, the protrusion 80 can easily disengage the locking projection 96 from the locking opening 48 by pushing up the locking projection 96 from the inside. Furthermore, since the protrusion 80 is long in the longitudinal direction, when the engagement of the engagement projection 96 from the first engagement opening 48A is released, the proximal end side of the first engagement opening 48A is released. It is possible to reliably prevent the locking projection 96 from entering the second and

third locking openings

48B and 48C. Therefore, the guide wire operating member 24 can be favorably retracted in the proximal direction.

The catheter assembly 10 according to the present invention is not limited to the above-described embodiment, and various application examples and modification examples can be taken. For example, the urging mechanism 93 that retracts the guide wire operating member 24 is not limited to the coil spring 94, and a plate spring, an air spring, rubber, or the like may be applied. Alternatively, the guide wire 22 itself may have an urging mechanism by making the proximal end portion of the guide wire 22 into a coil shape or the like. Further, the shapes of the first and

second locking portions

46 and 95 are not particularly limited, and may be, for example, a circular shape or other polygonal shapes in a plan sectional view, may be hooked between the claw portions, or may be concave and convex. The fitting structure by a part may be sufficient. Alternatively, a protrusion may be provided on the housing 14 as the first locking portion 46, and an opening may be provided on the guide wire operating member 24 as the second locking portion 95.

The catheter assembly 10 has a configuration in which the protector 26 advances as the catheter hub 18 advances in the above-described embodiment, and the release portion 79 releases the lock between the first lock portion 46 and the second lock portion 95. However, it is not limited to this configuration. For example, a lock release button may be provided on the housing 14 and the lock may be released by operating the lock release button by the user. Further, the catheter assembly 10 may not include the urging mechanism portion 93. In this case, after the unlocking operation of the first locking part 46 and the second locking part 95 is performed, the guide wire operating member 24 is manually retracted in the proximal direction by the user, and the guide wire 22 What is necessary is just to set it as the structure which accommodates a front-end | tip in the inner needle 12. FIG. Further, a moving mechanism for retracting the guide wire 22 with respect to the inner needle 12 may be provided as the catheter hub 18 moves forward with respect to the housing 14.

Hereinafter, some modified examples of the catheter assembly 10 and other embodiments will be illustrated. In the following description, the same reference numerals as those in the first embodiment are assumed to have the same configuration or the same function, and the detailed description thereof will be omitted below.

For example, the urging mechanism 93A according to the first modification shown in FIG. 7 is the first embodiment in that a coil spring 94A is disposed between the wire holding wall 88 of the guide wire operating member 24 and the rear wall 38 of the housing 14. It differs from the biasing mechanism part 93 which concerns on a form.

The coil spring 94A has one end fixed to the proximal end surface of the wire holding wall 88 and the other portion fixed to the distal end surface of the rear wall 38 of the housing 14. The coil spring 94A provides an urging force (elastic restoring force) that elastically expands and retracts the wire holding wall 88 when the wire holding wall 88 advances in the distal direction. As described above, even when the coil spring 94A is provided on the proximal end side with respect to the wire holding wall 88, the guide wire operating member 24 is automatically retracted to retract the distal end of the guide wire 22 to the proximal end side with respect to the needle tip 12a. Can be made.

Further, in the catheter assembly 10 according to the second modification shown in FIGS. 8A to 8C, a displacement member 100 different from the upper wall 42 is provided on the housing 14, and the height position of the displacement member 100 is changed. The displacement operation part 102 (release part 79A) is different from the release part 79 according to the first embodiment in that the second relay cylinder 68 is provided with a displacement operation part 102 (release part 79A).

The displacement member 100 is provided with four locking recesses 104 (first locking portions 103) in which the locking protrusions 96 of the guide wire operating member 24 can be inserted and locked along the axial direction (hereinafter, referred to as the locking protrusions 96). , Also referred to as first to fourth locking recesses 104A to 104D in order from the distal end to the proximal end). Further, the displacement member 100 has a thin distal end and a thick proximal end, so that the lower surface of the displacement member 100 is a displacement-side inclined portion 106 that gently slopes downward toward the proximal end of the housing 14. . Further, the displacement member 100 includes a guide protrusion 108 that is inserted into the guide groove 112 of the displacement operation unit 102.

On the other hand, the displacement operation unit 102 is formed such that the tip is high and the base is low, so that the upper surface of the displacement operation unit 102 is inclined along the base end direction of the second relay cylinder 68 at the same inclination angle as the displacement-side inclination unit 106. An inclined portion 110 is formed. In addition, a guide groove 112 that is inclined along the inclination of the operation side inclined portion 110 is formed inside the displacement operation portion 102.

In the initial state, the release portion 79 </ b> A formed in this way has the displacement member 100 disposed above the displacement operation portion 102, thereby restricting the displacement member 100 from falling into the internal space 32 a (axial center portion). Has been. Therefore, the locking projection 96 of the guide wire operating member 24 is inserted and locked in the fourth locking recess 104D. Further, for example, even when the guide wire operating member 24 is advanced in the distal direction and the locking projection 96 is inserted into the first to third locking recesses 104A to 104C, the state continues (see FIG. 8B).

Then, when the protector 26 (second relay cylinder 68) advances relative to the housing 14 with the removal of the catheter 16 from the inner needle 12, the displacement operation unit 102 also advances integrally. At this time, the displacement operation unit 102 advances in the distal direction while the operation-side inclined portion 110 slides on the displacement-side inclined portion 106 and further guides the guide protrusion 108 in which the guide groove 112 is inserted downward. Therefore, as shown in FIG. 8C, the displacement member 100 is displaced to the inside (downward) of the housing 14, and the locking state of the locking projection 96 is released accordingly. As a result, the guide wire operating member 24 moves backward under the urging action of the coil spring 94 to move the guide wire 22 backward from the needle tip 12a of the inner needle 12 to the proximal end side.

As described above, the release portion 79A can be configured to displace the displacement member 100 to the inside of the housing 14 and release the engagement between the engagement recess 104 and the engagement protrusion 96. Thereby, the guide wire operating member 24 does not enter the locking recess 104 on the proximal end side with respect to the locking recess 104 locked by the locking projection 96, and smoothly moves backward in the proximal direction. .

Further, in the catheter assembly 10 according to the third modification shown in FIGS. 9A to 9C, the lower part of the displacement member 100A is formed flat, and the upper part of the second relay cylinder 68 supports the displacement member 100A. This is different from the second modification.

In this case, the displacement member 100A is formed to be thick enough to fill the space between the second relay cylinder 68 and the upper wall 42, and is supported on the outer peripheral surface (release portion 79B) of the second relay cylinder 68 in the initial state. Therefore, the locking recess 104 (first to fourth locking recesses 104A to 104D) is positioned on the upper wall 42 side. Therefore, the protrusion of the guide wire operating member 24 can be maintained by operating the guide wire operating member 24 to advance, for example, by inserting the locking protrusion 96 into the first locking recess 104A.

When the protector 26 extends and the second relay cylinder 68 releases the support state of the displacement member 100A, the displacement member 100A is displaced to the lower side (axial center portion) of the housing 14 by its own weight. Thereby, the latching state of 104 A of 1st latching recessed parts and the latching protrusion 96 is cancelled | released, and the cancellation | release part 79B can acquire the effect similar to the cancellation | release part 79A which concerns on a 2nd modification.

Although not shown, the catheter assembly 10 is not limited to the configuration of the above-described embodiment in which the guide wire 22 is fixed to the guide wire operating member 24, and other members may be fixed. For example, as another modified example, a configuration in which the proximal end portion of the guide wire 22 is fixed to the housing 14 can be mentioned. In this case, the guide wire operating member 24 has a curved hole shape that folds the guide wire 22 extending in the proximal direction from the housing 14 toward the inner needle 12 and guides and supports the guide wire 22 slidably. A guide portion is provided. In such a configuration, when the guide wire operating member 24 is advanced with respect to the housing 14, the guide wire 22 slides within the guide portion, and the proximal end side fixed portion of the guide wire 22 and the guide portion come close to each other. Then, it is pushed in the distal direction and moves forward with respect to the inner needle 12. As a result, the guide wire 22 protrudes from the distal end opening 30a of the inner needle 12 by a predetermined length. When the catheter hub 18 is advanced with respect to the housing 14, the protrusion 80 of the protector 26 releases the engagement between the guide wire operating member 24 and the housing 14. As a result, the guide wire operating member 24 is automatically retracted in the proximal direction by the coil spring 94, so that the guide portion inside thereof is also retracted, and the distal end side of the guide wire 22 in a free state is in relation to the inner needle 12. Then, it is retracted and stored in the inner needle 12.

[Second Embodiment]
10A, the catheter assembly 210 according to the second embodiment differs from the catheter assembly 10 according to the first embodiment in that the catheter assembly 210 according to the second embodiment is configured as a short-type indwelling needle in which the catheter 216 is formed short. . In this case, the catheter assembly 210 has a configuration in which a part of the inner cylinder 264 protrudes from the distal end of the housing 214 (needle hub) and the catheter hub 218 is locked. The housing 214 is formed short in the axial direction, and the inner needle 212 is fixedly held therein. The inner needle 212 has a needle tip 212a.

Note that the protector 226 is configured by two cylinders, an inner cylinder 264 and an outer cylinder 266, because the inner needle 212 is short in the axial direction. On the outer peripheral surface of the outer cylinder 266, a projecting piece 280 (release part 279) that is short in the axial direction for releasing the engagement of the first engagement part 46 and the second engagement part 95 is provided. Each configuration provided on the guide wire operating member 224 and the upper wall 242 and the coil spring 294 have the same configuration as the catheter assembly 10.

Alternatively, the short type catheter assembly 210 is also provided with a coil spring 294A between the proximal end surface of the wire holding wall 88 of the guide wire operating member 224 and the rear wall 38 of the housing 214, as in the fourth modification shown in FIG. 10B. May be.

Claims

A catheter (16, 216);
A catheter hub (18, 218) for fixedly holding the catheter (16, 216);
A hollow inner needle (12, 212) having a needle tip (12a, 212a) and removably inserted into the catheter (16, 216);
A needle hub (14, 214) fixedly holding the inner needle (12, 212) and having a first locking portion (46, 103);
A guide wire (22) that is inserted into the inner needle (12, 212), can move relative to the inner needle (12, 212) and protrude from the needle tip (12a, 212a);
A second locking portion (95) that supports the guide wire (22), operates the relative movement of the guide wire (22), and can be locked to the first locking portion (46, 103). A guide wire operating member (24, 224);
A release portion (79, 79A, 79B, 279) for releasing the locking of the first locking portion (46, 103) and the second locking portion (95),
When the first locking portion (46, 103) and the second locking portion (95) are locked, relative movement of the guide wire (22) with respect to the inner needle (12, 212) is restricted. A catheter assembly (10, 210) characterized in that.
The catheter assembly (10, 210) according to claim 1,
A biasing force that biases the guide wire operating member (24, 224) in the proximal direction based on the advance in the distal direction is applied, and along with the unlocking by the release portion (79, 79A, 79B, 279), A catheter assembly (10, 210) comprising a biasing mechanism (93) for retracting the guide wire (22) in the proximal direction relative to the inner needle (12, 212).
The catheter assembly (10, 210) according to claim 1,
The guide wire operating member (24, 224) includes a first state in which a tip of the guide wire (22) is positioned in the inner needle (12, 212), and a tip of the guide wire (22) Movable between a second state of the needle (12, 212) protruding from the needle tip (12a, 212a);
The catheter assembly (10, 210) further comprising a biasing mechanism (93, 93A) for biasing the guide wire operating member (24, 224) from the second state to the first state. ).
Catheter assembly (10, 210) according to claim 3,
The urging mechanism (93, 93A) is disposed between a needle holder (34) provided on the needle hub (14, 214) and the guide wire operating member (24, 224). A catheter assembly (10, 210) characterized by:
The catheter assembly (10, 210) according to claim 1,
The release portion (79, 79A, 79B, 279) is operated in conjunction with an operation in which the catheter hub (18, 218) advances relative to the needle hub (14, 214). Catheter assembly (10, 210).
The catheter assembly (10, 210) according to claim 1,
The release portion (79, 79A, 79B, 279) holds the catheter hub (18, 218) or the catheter hub (18, 218) accommodated inside the needle hub (14, 214) and holds the catheter hub (18, 218). A catheter assembly (10, 210) characterized in that it is provided on a protector (26, 226) that accommodates the inner needle (12, 212) by extending as the catheter hub (18, 218) advances.
The catheter assembly (10, 210) according to claim 1,
The catheter assembly (10, 210), wherein a plurality of the first locking portions (46, 103) are provided along the longitudinal direction of the needle hub (14, 214).
The catheter assembly (10, 210) according to claim 1,
The first locking portion (46, 103) is an opening (48) communicating with the inside of the needle hub (14, 214),
The second locking portion (95) is a protrusion (96) inserted into the opening (48) and hooked on the mouth edge of the opening (48). 210).
The catheter assembly (10, 210) according to claim 8,
The release portion (79, 279) is configured so that the protrusion (96) inserted into the opening (48) with the advancement of the catheter hub (18, 218) is connected to the inside of the needle hub (14, 214). The catheter assembly (10, 210), wherein the catheter assembly is pushed up to release the lock.
The catheter assembly (10, 210) according to claim 9,
The release portion (79, 279) is formed longer in the longitudinal direction than the interval between two adjacent openings (48) of the plurality of openings (48). Solid (10, 210).
The catheter assembly (10) of claim 1,
The release portion (79A, 79B) displaces the first locking portion (46) to the inside of the needle hub (14) with the advancement of the catheter hub (18), thereby moving the second locking portion (95). The catheter assembly (10) characterized in that the locking with the same is released.