JP7245863B2 - catheter assembly - Google Patents

Description

TECHNICAL FIELD The present invention relates to a catheter assembly for puncturing a blood vessel and indwelling it, for example, when administering an infusion or the like to a patient.

2. Description of the Related Art Conventionally, for example, a catheter assembly is used when infusing a fluid or the like to a patient. This type of catheter assembly consists of a hollow catheter, a catheter hub fixed to the proximal end of the catheter, a hollow inner needle inserted into the catheter and having a sharp tip at the tip, and a proximal end of the inner needle. and a needle hub affixed to.

In such a catheter assembly, the catheter hub is accommodated in a vertically separable housing (needle hub) in an initial state in which the tip of the inner needle protrudes from the tip of the catheter (see, for example, Patent Document 1). Initially, the upper and lower housings are locked in engagement with each other to support the catheter. On the other hand, after puncturing the patient with the inner needle, the lock is released and the upper and lower housings can be separated before advancing (advancing) the catheter distally with respect to the inner needle. Then, when the catheter is advanced with respect to the inner needle, the upper housing and the lower housing are separated from each other and the catheter hub is detached from the housing.

Japanese Patent Publication No. 2013-529111

However, in a catheter assembly such as the above-mentioned US Pat. No. 6,200,000, the engagement between the upper housing and the lower housing is unlocked before the catheter is advanced with respect to the inner needle. Therefore, when the catheter is advanced with respect to the inner needle, the resistance received by the catheter (frictional resistance between the catheter and the patient's skin) bends the catheter and the inner needle, which may cause discomfort to the user. In addition, the tip of the inner needle may slip out of the patient's skin, or the tip of the inner needle, which has slipped out of the skin, may pierce the catheter when it advances due to its restoring force.

SUMMARY OF THE INVENTION The present invention has been made in consideration of such problems, and provides a catheter assembly in which a catheter can be smoothly inserted into a blood vessel without discomfort and a catheter hub can be easily detached from a housing. intended to provide

In one aspect of the present invention, a hollow catheter, a catheter hub fixed to the proximal end of the catheter, a hollow inner needle inserted through the catheter, and the inner needle are supported, and from the tip of the catheter, a housing in which the catheter hub is disposed in an initial state in which the tip of the inner needle protrudes; a support member that supports the catheter; and a support member that is connected to the catheter hub and extends along the longitudinal direction of the housing relative to the housing. a catheter operating member that can be displaced by the housing, wherein the housing is formed with a first support groove in which the catheter is disposed; and the support member has a cross-sectional shape in half in which the catheter is disposed. A circular second support groove is formed, the catheter is slidably disposed in a space formed by the first support groove and the second support groove, and the support member is separate from the catheter hub. Switchable between a first state in which the catheter is not connected and supports the catheter when the catheter advances distally with respect to the inner needle, and a second state in which the catheter hub is allowed to be detached from the housing. a catheter assembly provided in the housing in .

According to the present invention, when the support member is in the first state, the catheter is supported when the catheter advances to the distal end side with respect to the inner needle, so that the catheter and the inner needle bend due to the resistance received by the catheter. can be suppressed. As a result, the catheter can be smoothly inserted into the blood vessel without discomfort. Further, after inserting the catheter into the blood vessel, the catheter hub can be easily detached from the housing by setting the support member to the second state.

1 is a perspective view of a catheter assembly according to a first embodiment of the invention; FIG. 2 is an exploded perspective view of the catheter assembly of FIG. 1; FIG. 3A is a perspective view of the housing shown in FIG. 2 as viewed obliquely from above, and FIG. 3B is a perspective view of the supporting member main body of FIG. 2 as seen obliquely from below. 2 is a partial longitudinal cross-sectional view of the catheter assembly of FIG. 1; FIG. 5A is a cross-sectional view showing a first state of the support member of FIG. 1, and FIG. 5B is a cross-sectional view showing a second state of the support member of FIG. 6A is a first diagram illustrating how to use the catheter assembly of FIG. 1, and FIG. 6B is a second diagram illustrating how to use the catheter assembly of FIG. 7A is a third diagram illustrating how to use the catheter assembly of FIG. 1, and FIG. 7B is a fourth diagram illustrating how to use the catheter assembly of FIG. FIG. 3 is a cross-sectional view showing a modification of the support member of FIG. 1; Fig. 10 is a perspective view of a catheter assembly according to a second embodiment of the invention; Figure 10 is an exploded perspective view of the catheter assembly of Figure 9; FIG. 10 is a bottom perspective view of the catheter operating member and catheter member of FIG. 9; 12A is a perspective view of the support member in FIG. 10 as viewed obliquely from below, and FIG. 12B is a perspective view of the support member in FIG. 10 as viewed obliquely from above. 13A is a bottom plan view of the support member in FIG. 9 in the closed position, and FIG. 13B is a bottom plan view of the support member in FIG. 9 in the open position.

BEST MODE FOR CARRYING OUT THE INVENTION A preferred embodiment of a catheter assembly according to the present invention will be described below with reference to the accompanying drawings.

(First embodiment)
A catheter assembly 10A according to the present embodiment, whose initial state is shown in FIG. 1, is applied when infusion or blood transfusion is performed in a patient (living body), and is punctured and indwelled in the patient's body to construct an introduction portion for a drug solution or the like. do. Catheter assembly 10A may be configured as a catheter that is longer than a peripheral venous catheter (eg, central venous catheter, PICC, midline catheter, etc.). Note that the catheter assembly 10A may be configured as a peripheral intravenous catheter. Moreover, the catheter assembly 10A is not limited to being a venous catheter, and may be configured as an arterial catheter such as a peripheral arterial catheter.

As shown in FIGS. 1 and 2, the catheter assembly 10A includes a catheter 12, a catheter hub 14 that holds the catheter 12 fixedly, a hollow inner needle 16 removably inserted into the catheter 12, and an inner needle 16. 16, a catheter operation member 20 mounted on the upper side of the catheter hub 14, an auxiliary member 22 removably inserted between the catheter 12 and the inner needle 16, and the auxiliary member 22 fixed and held. a needle protection member 26 connected to the proximal end of the catheter hub 14 and the auxiliary member hub 24; and a support member 27 provided in the housing 18 to support the catheter 12. A part of the inner needle 16 may be cut out along the axial direction. Also, the inner needle 16 may be a solid needle.

The catheter assembly 10A forms a multiple tube structure (multiple tube section) in which the catheter 12, the auxiliary member 22 and the inner needle 16 are stacked in order in the initial state before use.

The catheter 12 is flexible and has a lumen 13 formed therethrough. The lumen 13 is formed to have a diameter that can accommodate the inner needle 16 and the auxiliary member 22 and that allows liquid medicine, blood, and the like to flow. The tip of catheter 12 is tapered to reduce puncture resistance. The length of the catheter 12 is not particularly limited and can be appropriately designed according to the application and various conditions. set.

The constituent material of the catheter 12 is not particularly limited, but is preferably a soft resin material such as polytetrafluoroethylene (PTFE), ethylene-tetrafluoroethylene copolymer (ETFE), perfluoroalkoxy fluororesin. fluororesins such as (PFA), olefinic resins such as polyethylene and polypropylene, or mixtures thereof, polyurethane, polyester, polyamide, polyether nylon resins, mixtures of olefinic resins and ethylene/vinyl acetate copolymers, and the like. be done.

The proximal end of catheter 12 is secured to the distal end within catheter hub 14 by any suitable securing method (crimping, fusing, gluing, etc.). A catheter member 17 is configured by the catheter 12 and the catheter hub 14 .

The catheter hub 14 is exposed on the patient's skin while the catheter 12 is inserted into the blood vessel, is attached with tape or the like, and is indwelled together with the catheter 12 . The catheter hub 14 is formed in a cylindrical shape that tapers in the distal direction.

The constituent material of the catheter hub 14 is not particularly limited, but thermoplastic resins such as polypropylene, polycarbonate, polyamide, polysulfone, polyarylate, and methacrylate-butylene-styrene copolymer may be applied.

Inside the catheter hub 14, a hollow portion 15 is provided that communicates with the lumen 13 of the catheter 12 and allows the infusion solution to flow. The hollow portion 15 may accommodate a hemostasis valve, a plug, or the like (not shown) that prevents backflow of blood when the inner needle 16 is punctured and allows infusion as the connector of the infusion tube is inserted.

As shown in FIG. 2 , an annular protrusion 28 is formed on the outer peripheral surface of the catheter hub 14 near the distal end, protruding radially outward and going around the catheter hub 14 in the circumferential direction. A threaded portion 30 projecting radially outward in a flange shape and extending in the circumferential direction is provided on the proximal end side of the catheter hub 14, to which a connector of an infusion tube (not shown) is connected after the inner needle 16 is detached. be.

On the other hand, the inner needle 16 of the catheter assembly 10A is configured as a hollow tube having rigidity capable of piercing the skin of a living body, and is arranged to pass through the lumen 13 of the catheter 12 and the hollow portion 15 of the catheter hub 14 . The inner needle 16 is formed to have a full length longer than that of the catheter 12, and is provided with a sharp needle tip 16a at its distal end.

In the initial state shown in FIG. 1, the multiple tube portion exposes the needle tip 16a from the catheter 12 and the auxiliary member 22. As shown in FIG. Inside the inner needle 16 , a lumen is provided that penetrates in the axial direction of the inner needle 16 , and this lumen communicates with the tip opening of the inner needle 16 . The outer peripheral surface of the inner needle 16 may be provided with a groove for flashback confirmation along the axial direction.

Examples of materials constituting the inner needle 16 include metal materials such as stainless steel, aluminum or aluminum alloys, titanium or titanium alloys, hard resins, and ceramics. The inner needle 16 is firmly fixed to the housing 18 by an appropriate fixing method (fusion, adhesion, insert molding, etc.).

A portion of the multiple tube portion, the catheter hub 14, the catheter operating member 20, the auxiliary member hub 24, the needle protection member 26, and the support member 27 are arranged (accommodated) in the housing 18 in the initial state. The resin material that constitutes the housing 18 is not particularly limited, but for example, the materials listed for the catheter hub 14 can be appropriately selected.

The housing 18, as shown in FIG. a pair of second side walls 35a and 35b projecting upward from the lower wall 32;

As shown in FIGS. 3A and 4, the lower wall 32 has a distal end extending upward from the base end side, and the upper surface of the distal end of the lower wall 32 is recessed in an arc shape. A first support groove having a semicircular cross-sectional shape in which the catheter 12 is disposed is located in the center of the upper surface of the distal end portion of the lower wall 32 in the width direction (the direction perpendicular to the longitudinal direction and the vertical direction of the housing 18). 38 are formed along the length. A first concave portion 40 having a semicircular cross-sectional shape is formed in the longitudinal center of the inner surface of the first support groove 38 . Thereby, the sliding resistance between the outer surface of the catheter 12 and the inner surface of the first support groove 38 can be suitably suppressed.

The cross-sectional shape of the first support groove 38 and the first concave portion 40 is not limited to a semicircular shape, and may be an arc shape other than a semicircular shape. Also, the first support groove 38 and the first recess 40 may not be provided in the catheter assembly 10A. In this case, the catheter 12 contacts the upper surface of the distal end of the lower wall 32 .

The pair of first side walls 34a and 34b extend parallel to the longitudinal direction together with the lower wall 32, and are formed such that the vertical width on the distal end side is narrower than the vertical width on the proximal end side. Notch portions 42a and 42b that open toward the tip side are formed in the vertical center of each of the first side walls 34a and 34b. A rectangular fitting hole 44 extends in the longitudinal direction slightly closer to the proximal end than the notch 42a of one of the first side walls 34a. The cutouts 42 a and 42 b and the fitting hole 44 are for holding the support member 27 to the housing 18 . The pair of second side walls 35a and 35b extends in parallel with the lower wall 32 in the longitudinal direction and has a constant vertical width. The needle holding portion 36 is located between the pair of second side walls 35a, 35b.

Since the housing 18 holds the inner needle 16 in the needle holding portion 36 , when the housing 18 is moved in the proximal direction with respect to the catheter 12 , the inner needle 16 is also moved with respect to the catheter 12 as the housing 18 moves. to move proximally. That is, housing 18 also functions as a needle hub fixed to the proximal end of inner needle 16 . Alternatively, the needle holding portion 36 may be molded separately from the housing 18 and fixed to the housing 18 by bonding.

As shown in FIG. 1, the catheter assembly 10A has the catheter hub 14 and the needle protection member 26 exposed from the housing 18 in the initial state. The catheter assembly 10A may have a structure in which a side wall is formed in the center of the longitudinal direction of the housing 18 to surround the catheter hub 14, the needle protection member 26, and the like. Alternatively, the catheter hub 14, the needle protection member 26, and the like may be covered.

The catheter operation member 20 is attached to the catheter hub 14 to move the catheter 12 and the catheter hub 14 toward and away from the inner needle 16 and the housing 18 relative to each other. More specifically, the catheter operating member 20 includes a flat plate portion 46 extending in the distal and proximal directions, an operating portion 48 extending slightly upward from the distal end of the flat plate portion 46 in the proximal direction, and an integral part at the proximal end of the flat plate portion 46 . A hub mount 50 is molded and detachable from the catheter hub 14 .

The operation part 48 is a part with which the user's fingers are brought into contact to advance and retract the catheter 12 . Since the flat plate portion 46 is formed thin, it has flexibility so that it can be easily bent in a direction perpendicular to the surface direction of the flat plate portion 46 . The material for forming the flat plate portion 46 (catheter operation member 20) is not particularly limited, but, for example, the materials listed for the catheter hub 14 can be appropriately selected.

The flat plate portion 46 has a wide portion (cam holding portion) 52 that extends with a constant width from the tip to slightly short of the base end, and a narrow portion with a constant width that constitutes the base end of the flat plate portion 46 . (Cam holding releasing portion) 54 is provided.

The narrow portion 54 is formed by cutting out the side portion of the base end portion of the flat plate portion 46 in the direction in which the fitting hole 44 is positioned. A first inclined surface 56 is formed on the side surface of the boundary between the wide portion 52 and the narrow portion 54 in the direction in which the fitting hole 44 is located. ing. The hub mounting part 50 is configured to be able to displace (advance) the catheter hub 14 toward the distal end by manipulating it in the distal direction. The hub attachment portion 50 is rotatable in the circumferential direction with respect to the catheter hub 14 while attached to the catheter hub 14 .

The auxiliary member 22 is detachably inserted inside the catheter 12 to prevent the inner surface of the catheter 12 from being damaged by the tip of the inner needle 16 and to strengthen the rigidity of the catheter 12 when the catheter 12 is inserted into the blood vessel. It is an elongated member having flexibility. Specifically, in the initial state of the catheter assembly 10A, the auxiliary member 22 is arranged along the extending direction of the catheter 12 between the catheter 12 and the inner needle 16. As shown in FIG. In this embodiment, the auxiliary member 22 is formed in a tubular shape, and the inner needle 16 is inserted through the lumen of the auxiliary member 22 .

In the case of this embodiment, in the initial state of the catheter assembly 10A, the distal end portion of the auxiliary member 22 is positioned closer to the proximal side than the distal end portion of the catheter 12 is. The distal end of the auxiliary member 22 may be located at the same position as the distal end of the catheter 12 or on the distal side of the distal end of the catheter 12 .

The shape of the auxiliary member 22 is not limited to a tubular shape, and may be a shape having a C-shaped cross section in which a part of the circular circumference is notched, or a shape having an arc-shaped cross section of less than 180° in the circumferential direction. It's okay. Further, the auxiliary member 22 may be configured to have a gap extending through the inside and outside of the auxiliary member 22, for example, may be configured in a coil shape, a mesh shape, or the like.

Materials constituting the auxiliary member 22 include resin materials (eg, one or more materials selected from the resin materials exemplified as the constituent materials of the catheter 12) and metal materials (eg, stainless steel, superelastic alloys, etc.). .

The auxiliary member hub 24 is made of, for example, the same hard resin as the catheter hub 14 and fixed to the proximal end of the auxiliary member 22 . The auxiliary member hub 24 is formed in a hollow shape. In the initial state, the distal end portion of the auxiliary member hub 24 is detachably fitted to the inner peripheral portion of the proximal end of the catheter hub 14, and the distal end portion of the needle protection member 26 is fitted. is fitted to the inner peripheral portion of the proximal end of the auxiliary member hub 24 and releasably engaged with the outer peripheral portion of the proximal end (threaded portion 30) of the catheter hub 14. As shown in FIG.

In the catheter assembly 10A, if the diameter of the catheter 12 is relatively large and there is little need for assistance (support) from the inside for strengthening rigidity, the assistance member 22 may not be provided. In this case, if the auxiliary member hub 24 is provided as it is, the structure of the needle protection member 26 may be the same as that of the illustrated example, and the needle protection member 26 is formed with and without the auxiliary tube. No need to prepare two molds. That is, in either case, the needle protection member 26 can be molded with a mold having the same shape.

Also, the auxiliary member hub 24 may not be provided in the catheter assembly 10A. In this case, the proximal end of the auxiliary member 22 is directly fixed to the needle protection member 26, and the distal end of the needle protection member 26 is formed into a shape detachably fitted to the inner peripheral portion of the proximal end of the catheter hub 14. be done. Further, the auxiliary member 22 and the auxiliary member hub 24 may not be provided in the catheter assembly 10A. Also in this case, the distal end shape of the needle protection member 26 is formed into a shape that is detachably fitted to the inner peripheral portion of the proximal end of the catheter hub 14 .

A leaf spring-like shutter 58 is arranged inside the needle protection member 26 . In the initial state, the shutter 58 is pressed and compressed by the outer surface of the inner needle 16 . On the other hand, when the inner needle 16 retreats with respect to the needle protection member 26 and the needle tip 16a of the inner needle 16 moves to the proximal end side of the shutter 58, the pressure of the inner needle 16 on the shutter 58 is released, and the shutter 58 is released. Expands (opens) by elastic restoring force. As a result, the needle insertion passage in the needle protection member 26 is blocked. A retaining member 60 is provided in the proximal end portion of the needle protection member 26 so that the inner needle 16 does not slip out of the needle protection member 26 in the proximal direction.

As shown in FIGS. 1 and 2 , the support member 27 is a member that supports the catheter 12 and is detachable from the distal end portion of the housing 18 . The resin material that constitutes the support member 27 is not particularly limited, but for example, the materials listed for the catheter hub 14 can be appropriately selected.

The support member 27 has a block-shaped support member main body 62 extending along the longitudinal direction of the housing 18 and a cam 64 that holds the support member main body 62 to the housing 18 . A lower surface of the support member main body 62 facing the lower wall 32 protrudes downward in an arc shape. The lower portion of the base end surface of the support member main body 62 slopes downward toward the distal direction (see FIG. 3B).

In the lower surface of the support member main body 62, a second support groove 66 having a semicircular cross-sectional shape in which the catheter 12 is disposed extends along the longitudinal direction from the distal end of the support member main body 62 to the proximal end surface. is formed to face the A second concave portion 68 having a semicircular cross section is formed in the longitudinal center of the inner surface of the second support groove 66 . Thereby, the sliding resistance between the outer surface of the catheter 12 and the inner surface of the second support groove 66 can be suppressed appropriately.

The cross-sectional shape of the second support groove 66 and the second concave portion 68 is not limited to a semicircular shape, and may be an arc shape other than a semicircular shape. Also, the second support groove 66 and the second recess 68 may not be provided in the catheter assembly 10A. In this case, catheter 12 contacts the lower surface of support member body 62 .

The catheter 12 is slidably arranged in the space defined by the first support groove 38 of the housing 18 and the second support groove 66 of the support member main body 62 (see FIG. 4). That is, the catheter 12 is supported between the housing 18 and the support member body 62 by slidably contacting both the inner surface of the first support groove 38 and the inner surface of the second support groove 66 .

Protrusions 70a and 70b to be inserted into the notches 42a and 42b are provided on the side surfaces of the support member main body 62 that face the first side walls 34a and 34b. By inserting the projections 70a and 70b into the cutouts 42a and 42b, displacement of the support member main body 62 in the proximal direction and in the vertical direction with respect to the housing 18 is restricted. As a result, the support member main body 62 is firmly held with respect to the housing 18, so that the support member main body 62 can support the catheter 12 more stably.

At least one of the pair of protrusions 70a and 70b may not be provided in the catheter assembly 10A. In this case, the cutouts 42a and 42b corresponding to these projections 70a and 70b may not be provided either. Even with such a configuration, the support member main body 62 can be held with respect to the housing 18 by the cam 64 .

As shown in FIGS. 3B to 5A, the support member main body 62 includes an insertion hole 72 through which the flat plate portion 46 of the catheter operation member 20 is inserted, a first arrangement hole 74 communicating with the insertion hole 72, and a first arrangement hole 74. A second mounting hole 76 that communicates with the mounting hole 74 and opens to the side surface of the support member main body 62 is formed. The insertion hole 72 extends along the longitudinal direction from the distal end surface to the proximal end surface of the support member main body 62 and opens to the upper surface of the support member main body 62 at the distal end portion of the support member main body 62 . As a result, a part of the operation portion 48 of the catheter operation member 20 can be arranged in the insertion hole 72 in the initial state.

The first arranging hole 74 and the second arranging hole 76 form one arranging hole 78 in which the cam 64 is arranged. The first disposing hole 74 extends from substantially the center in the longitudinal direction of the support member main body 62 to the base end surface. The second mounting hole 76 is open in a rectangular shape on the side surface of the support member main body 62 and communicates with the fitting hole 44 when the support member main body 62 is attached to the housing 18 . In the longitudinal direction of the support member body 62 , the second mounting hole 76 is shorter than the first mounting hole 74 and longer than the fitting hole 44 .

A pair of through-holes 80a and 80b passing through the support member main body 62 along the longitudinal direction are separated from each other in the width direction of the support member main body 62 (the width direction of the housing 18) above the insertion hole 72. formed by

The cam 64 is arranged in the arrangement hole 78 so as to be displaceable between a first position where it is fitted into the fitting hole 44 and a second position where it is separated from the fitting hole 44 . The support member main body 62 is held with respect to the housing 18 by fitting the cam 64 into the fitting hole 44 .

The cam 64 is a T-shaped flat plate member having a stopper portion 82 arranged in the first mounting hole 74 and a projecting portion 84 projecting from the stopper portion 82 toward the second mounting hole 76 . have. In the longitudinal direction of the support member main body 62 , the stopper portion 82 is formed longer than the second disposition hole 76 . This prevents (prevents) the cam 64 from slipping out of the installation hole 78 even when the support member main body 62 is separated from the housing 18 .

A second inclined surface 86 inclined toward the distal end of the catheter 12 toward the projecting portion 84 is formed on the surface of the stopper portion 82 facing the flat plate portion 46 . The inclination angle of the second inclined surface 86 is set to be the same as the inclination angle of the first inclined surface 56 of the flat plate portion 46 .

A guide surface 88 inclined toward the proximal direction of the catheter 12 toward the side opposite to the flat plate portion 46 is formed on the surface of the projecting portion 84 that faces the distal direction of the catheter 12 . That is, since the distal end portion of the projecting portion 84 is formed to gradually narrow toward the distal end portion, it can be fitted (inserted) into the fitting portion.

As shown in FIG. 5A , in a state where the wide portion 52 is positioned in the insertion hole 72 , the stopper portion 82 of the cam 64 contacts the wide portion 52 so that the protruding portion 84 is fitted into the fitting hole 44 . It is held in position 1. That is, the support member main body 62 is in a locked state that maintains the support of the catheter 12 . Therefore, when the catheter operation member 20 is displaced to the distal end side with respect to the housing 18 and the distal end portion of the catheter 12 is inserted into the blood vessel, even if a resistance force acts on the catheter 12, the support member main body 62 will not move from the housing 18. It can prevent you from leaving.

In the locked state in which the cam 64 is held at the first position, the guide surface 88 is in contact with the boundary portion (corner portion 90) between the wall surface forming the fitting hole 44 and the inner surfaces of the first side walls 34a and 34b. there is

On the other hand, as shown in FIG. 5B, when the narrow portion 54 is positioned in the insertion hole 72, the contact between the stopper portion 82 and the wide portion 52 is released. It becomes displaceable to a second position away from 44 . That is, the support member main body 62 is in an unlocked state in which it can be separated from the housing 18 (allowing the catheter hub 14 to be separated from the housing 18).

Therefore, when the catheter operation member 20 and the catheter member 17 are displaced in the distal direction relative to the housing 18 in the unlocked state, the support member 27 (the support member main body 62 and the cam 64) moves distally with respect to the housing 18. , and the guide surface 88 is pushed toward the narrow portion 54 by the corner portion 90 , the cam 64 is displaced from the first position to the second position and disengaged from the fitting hole 44 . At this second position, the stopper portion 82 of the cam 64 is in contact with the narrow portion 54 . Then, the support member 27 is removed from the housing 18 by displacing the catheter operating member 20 and the catheter member 17 relative to the housing 18 in the distal direction.

Next, the operation and effects of the catheter assembly 10A configured as described above will be described.

In the initial catheter assembly 10A shown in FIG. 1, the catheter hub 14, the auxiliary member hub 24, and the needle protection member 26 are connected, and the catheter hub 14 is attached to the hub attachment portion 50 of the catheter operation member 20. It is arranged integrally with the housing 18 .

In the initial state, the support member 27 supports the multiple tube section in which the catheter 12 , the auxiliary member 22 and the inner needle 16 are concentrically overlapped. Specifically, the catheter 12 was placed in the space formed by the first support groove 38 of the housing 18 and the second support groove 66 of the support member 27, thereby contacting both the housing 18 and the support member 27. supported by the state. At this time, since the wide portion 52 of the catheter operating member 20 is positioned in the insertion hole 72 of the support member main body 62 , the cam 64 is held at the first position where it fits into the fitting hole 44 . That is, the support member main body 62 is in a locked state that maintains the support of the catheter 12 .

When using the catheter assembly 10A, first, a puncturing operation is performed to puncture the patient's skin with the catheter assembly 10A. In the puncture operation, the user (doctor, nurse, etc.) grips the housing 18 and presses the distal end of the catheter assembly 10A (the distal end of the catheter 12 through which the inner needle 16 is inserted) against the patient. , puncture the skin toward the puncture target vessel. As a result, the tips of the inner needle 16 and the catheter 12 are pierced into the skin. At the time of puncturing, the support member 27 supports the catheter 12 as described above, so that the multiple tubes within the housing 18 are prevented from flexing even if the catheter 12 is subjected to resistance due to the puncture. As a result, the user can perform puncturing without discomfort.

Next, as shown in FIG. 6A, while fixing the position of the housing 18, the user operates the catheter operation member 20 in the distal direction to advance the catheter member 17 (the catheter 12 and the catheter hub 14). In this case, the user, for example, puts a finger on the operation portion 48 of the catheter operation member 20 to advance the catheter operation member 20 in the distal direction relative to the housing 18 . Although the catheter control member 20 remains straight in FIG. 6A, in practice, the flat portion 46 of the catheter control member 20 is curved upwards so that the catheter control member 20 does not contact the patient's skin while the catheter is straightened. The operating member 20 is advanced.

At this time, as described above, the support member main body 62 is in a locked state that maintains the support of the catheter 12. Therefore, even if the resistance due to the insertion of the catheter 12 is received, the catheter 12, the inner needle 16, etc. It is possible to suppress bending of the multiple tube portion. As a result, the catheter 12 can be smoothly inserted into the blood vessel without discomfort.

At this time, the catheter operation member 20 may be advanced or retracted with respect to the housing 18 depending on the user's preference. Even in such a case, since the support of the catheter 12 is maintained by the support member body 62, it is possible to suppress the bending of the multiple tube portion.

When the distal end of the catheter 12 is inserted to a predetermined position in the blood vessel, the narrow portion 54 of the catheter operation member 20 is positioned in the insertion hole 72 of the support member main body 62 . Since the contact between the stopper portion 82 and the wide portion 52 is released in this state, the cam 64 can be displaced from the first position to the second position. That is, the support member main body 62 is in an unlocked state in which it can be separated from the housing 18 .

Next, the user pulls the housing 18 in the proximal direction while holding the positions of the catheter control member 20 and the catheter member 17 . Then, the housing 18 is displaced in the base end direction relative to the support member 27, and the guide surface 88 is pushed toward the narrow portion 54 by the corners 90 of the first side walls 34a and 34b, whereby the cam 64 is fitted. It disengages from the joint hole 44 and is displaced to the second position. In this state, the stopper portion 82 of the cam 64 is in contact with the narrow portion 54 . Also, the pair of projections 70a and 70b are separated from the cutouts 42a and 42b.

Depending on the preference of the user, the catheter operation member 20 may be further displaced to the distal side with respect to the housing 18 while maintaining the position of the housing 18 . Even in this case, the hub mounting portion 50 contacts the base end surface of the support member main body 62 and pushes the support member main body 62 in the distal direction. At the same time, the guide surface 88 is pushed toward the narrow portion 54 by the corner portion 90, whereby the cam 64 is disengaged from the fitting hole 44 and displaced to the second position.

When the housing 18 is further pulled in the proximal direction, as shown in FIG. 6B, the support member body 62 and the cam 64 (support member 27) pushed in the distal direction by the hub mounting portion 50 are separated from the housing 18, and the catheter The member 17 and catheter operating member 20 are completely removed from the housing 18 and the inner needle 16 fixed to the housing 18 is removed from the catheter 12 . At this time, since the stopper portion 82 is formed longer than the second disposition hole 76 in the longitudinal direction of the support member main body 62 , the cam 64 does not slip out of the disposition hole 78 .

Also, a safety function is realized by the needle protection member 26 and the shutter 58 . That is, the shutter 58 blocks the needle insertion path in the needle protection member 26 as the needle tip 16a moves to the proximal end side relative to the shutter 58 in the needle protection member 26 . This prevents the inner needle 16 from projecting again from the tip of the needle protection member 26 . In addition, since the retaining member 60 prevents the inner needle 16 from coming out from the proximal end side of the needle protection member 26, the protection of the needle tip 16a by the needle protection member 26 is preferably maintained.

Further, when the housing 18 is further pulled in the proximal direction from the state of FIG. 6B, the connection between the catheter hub 14 and the needle protection member 26 is released. This separates the needle guard 26 from the catheter hub 14 as shown in FIG. 7A. At this time, since the auxiliary member hub 24 and the needle protection member 26 are connected, the needle protection member 26 pulls the auxiliary member hub 24 in the proximal direction, and the auxiliary member 22 is also removed from the catheter 12 .

The user then disengages the catheter control member 20 from the catheter hub 14, as shown in Figure 7B. Thereby, the catheter member 17 is left in the patient. Note that the catheter operation member 20 may remain attached to the catheter hub 14 depending on the user's preference.

Next, a connector of an infusion tube (not shown) is connected to the proximal side of the catheter member 17 (the proximal end of the catheter hub 14) from which the inner needle 16 and the auxiliary member 22 have been removed, and the infusion tube is connected to the patient. Infusion (drug solution) is administered.

In the above description, the catheter member 17 and the catheter operating member 20 are detached from the housing 18 after the support member 27 is detached from the housing 18 . However, depending on the preference of the user, the support member 27 once detached from the housing 18 may be reattached to the housing 18 to move the catheter 12 forward and backward with respect to the inner needle 16 .

In this case, the user inserts the proximal end of the support member main body 62 from the distal end side of the housing 18 by displacing the housing 18 toward the distal end side while holding the positions of the catheter operation member 20 and the catheter member 17 . As a result, the projections 70a and 70b are inserted into the cutouts 42a and 42b, respectively, and the second mounting hole 76 communicates with (opposes to) the fitting hole 44. As shown in FIG.

Then, while holding the position of the housing 18 in this state, the catheter operating member 20 is slid in the proximal direction. Then, the second inclined surface 86 is pushed toward the fitting hole 44 by the first inclined surface 56 , thereby displacing the cam 64 from the second position to the first position and fitting it into the fitting hole 44 . In this state, the wide portion 52 located in the insertion hole 72 and the stopper portion 82 come into contact with each other, so that the cam 64 is held at the first position.

The operation of attaching the support member 27 to the housing 18 is performed by sliding the catheter operation member 20 and the catheter member 17 in the proximal direction while holding the position of the housing 18 so that the proximal end of the support member main body 62 is attached to the housing 18 . You may make it insert from the tip side of.

When the support member 27 detached from the housing 18 is reattached to the housing 18, the catheter assembly 10A may have holding means 91 for holding the cam 64 at the second position (see FIG. 8). As the holding means 91 , for example, a configuration in which a convex portion 92 provided on the cam 64 is fitted into a concave portion 94 formed on the wall surface forming the arrangement hole 78 can be adopted.

Further, the holding means 91 may be configured such that the wall surface forming the mounting hole 78 is provided with a convex portion and the cam 64 is formed with a concave portion, or the wall surface forming the mounting hole 78 and the cam 64 are engaged with the convex portion. may be provided. The holding means 91 is set to have a holding force such that when the second inclined surface 86 is pushed toward the fitting hole 44 by the first inclined surface 56, the retention of the cam 64 at the second position is released. ing. When such a holding means 91 is provided, a part of the cam 64 is prevented from protruding from the arrangement hole 78 (an obstruction of the cam 64). can be inserted into

Further, in the above description, when the needle protection member 26 was separated from the catheter hub 14 , the auxiliary member hub 24 was left connected to the needle protection member 26 and the auxiliary member 22 was removed from the catheter 12 . However, depending on the user's preference, when the needle protection member 26 is separated from the catheter hub 14, the needle protection member 26 and the auxiliary member hub 24 are also separated so that the assembly of the auxiliary member 22 and the catheter 12 can be inserted into the blood vessel. may be inserted.

As described above, in the present embodiment, the support member 27 is in a locked state that maintains the support of the catheter 12 when the catheter 12 advances to the distal end side of the inner needle 16 and prevents the catheter hub 14 from being separated from the housing 18 . It is provided in the housing 18 so as to be switchable between an unlocked state that permits detachment. As a result, the catheter 12 can be smoothly inserted into the blood vessel without discomfort, and the catheter hub 14 can be easily detached from the housing 18 .

Further, the user can switch the support member 27 from the locked state to the unlocked state simply by displacing the catheter operation member 20 toward the distal end of the catheter 12 with respect to the housing 18, thereby improving the operability of the catheter assembly 10A. can be improved. Furthermore, since the support member 27 is restricted from being displaced with respect to the housing 18 in the locked state, the support member 27 can stably support the catheter 12, the inner needle 16, and other multiple tube portions.

Furthermore, when the catheter operating member 20 is displaced toward the distal end of the catheter 12 relative to the housing 18 in the unlocked state, the support member 27 is detached from the housing 18. can be easily removed from the housing 18.

According to the present embodiment, while the wide portion 52 is positioned in the insertion hole 72, the cam 64 is held in the first position where it fits in the fitting hole 44, and the support member 27 is locked. The member main body 62 can stably support the catheter 12 . Further, by displacing the catheter operation member 20 relative to the housing 18 toward the distal end of the catheter 12 to position the narrow portion 54 in the insertion hole 72, the cam 64 is moved from the first position to the fitting hole 44. The support member 27 becomes unlocked when it can be displaced to the seceding second position. Therefore, the support member 27 can be switched between the locked state and the unlocked state with a simple configuration. Further, the action of the guide surface 88 formed on the cam 64 allows the cam 64 to be easily displaced from the first position to the second position.

According to this embodiment, the cam 64 can be prevented from being separated from the arrangement hole 78 by the stopper portion 82, so that the operability of the catheter assembly 10A can be improved.

(Second embodiment)
Next, a catheter assembly 10B according to a second embodiment of the invention will be described with reference to FIGS. 9 to 13B. In addition, in the catheter assembly 10B according to the second embodiment, the same reference numerals are given to the same components as in the catheter assembly 10A according to the first embodiment, and detailed description thereof will be omitted.

As shown in FIGS. 9 and 10, a catheter assembly 10B according to this embodiment includes a catheter 12, a catheter hub 14, an inner needle 16, a housing 100, a catheter operating member 102, an auxiliary member 22, an auxiliary member hub 24, a needle A protection member 26 and a support member 104 are provided.

The housing 100 is made of the same material as the housing 18 described in the first embodiment, and includes a lower wall 106, a pair of side walls 108a and 108b projecting upward from the sides of the lower wall 106, and a lower wall 106. It has a needle holding part 110 that protrudes upward from the upper surface and supports the proximal end of the inner needle 16 .

A housing space 112 for housing a portion of the multiple tube portion, the catheter hub 14, the auxiliary member hub 24 and the needle protection member 26 is formed inside the lower wall 106 and the pair of side walls 108a and 108b.

The pair of side walls 108a and 108b extend parallel to the longitudinal direction together with the lower wall 106, and are formed such that the vertical widths of the proximal side and the intermediate side are constant, and the vertical width of the distal side is wider than that of the intermediate side. ing. A groove-shaped rail portion 114 is provided at the top of the tip side of each side wall 108a, 108b, which is formed by cutting the inner surface of the side wall 108a, 108b in a straight line. The rail portion 114 accommodates the left and right side edges of the catheter operation member 102 and guides the advance and retreat of the catheter operation member 102 . One side wall 108a is provided with an arrangement recess 116 for mounting the support member 104 thereon.

The arrangement recess 116 is cut out from the tip of the side wall 108a toward the base end and positioned between the lower wall 106 and the rail portion 114. As shown in FIG. A pair of upper and lower support holes 118 for rotatably mounting the support member 104 are provided in the lower wall 106 and the side wall 108a at the position where the placement recess 116 is formed. A window 120 is provided at a position overlapping the rail portion 114 (between the upper support hole portion 118 and the arrangement recess portion 116) to accommodate a cam projection portion 152 of the support member 104, which will be described later (see FIG. 12B). . The lower wall 106 is formed with a locking recess 122 into which the locking projection 164 is inserted when the support body 148 of the support member 104 is moved to the open position (position shown in FIG. 13B).

The catheter operation member 102 is made of the same material as the catheter operation member 20 described in the first embodiment, and directly holds the catheter 12 and is attached to the catheter hub 14, thereby providing a strong support for the inner needle 16 and the housing 100. The catheter 12 and catheter hub 14 are advanced and retracted relative to each other. More specifically, the catheter operation member 102 includes an operation plate portion 124 extending in the distal and proximal directions, and a hub attachment portion 125 integrally formed on the proximal end of the operation plate portion 124 and detachably attached to the catheter hub 14 . have

The catheter operation member 102 includes a wide portion (cam holding portion) 126 provided on the operation plate portion 124 and extending with a constant width dimension, and a narrow portion (cam holding portion) 126 provided on the hub mounting portion 125 and having a constant width dimension. (Cam holding releasing portion) 128 is provided. A step 130 is formed at the boundary between the wide portion 126 and the narrow portion 128 .

The operation plate portion 124 is a portion with which the user's finger is brought into contact to operate the catheter 12 to advance and retreat. Left and right side edges extending along the longitudinal direction of the operation plate portion 124 are arranged on the upper surfaces of the pair of side walls 108 a and 108 b and the pair of rail portions 114 . The operation plate portion 124 is formed to be sufficiently thin, so that the operation plate portion 124 has flexibility so that it can be easily bent in a direction perpendicular to the surface direction of the operation plate portion 124 .

As shown in FIGS. 9 to 11, an upper rib 132 and tabs 134 and 136 are provided on the upper surface of the operation plate portion 124, and a tip warp portion 138 is provided at the tip of the operation plate portion 124. A holding portion 140 and a lower rib 142 are provided on the lower surface of the portion 124 . A plurality of upper ribs 132 and lower ribs 142 are provided along the longitudinal direction of the operation plate portion 124 . These upper ribs 132 and lower ribs 142 protrude vertically, respectively, and extend linearly along the width direction of the operation plate portion 124 to increase the strength of the operation plate portion 124 in the width direction. As a result, the operation plate portion 124 is prevented from bending or bending inside the housing 100 even when an external force is applied from the outside, and smoothly advances and retreats along the upper surfaces of the pair of side walls 108 a and 108 b and the rail portion 114 .

The tabs 134 and 136 are parts that are assumed to be directly touched by the user's fingers, and protrude higher than the upper rib 132 . The number of installed tabs 134 and 136 is not limited to two as shown in FIG. 9, and may be one or three or more.

As shown in FIG. 11, the holding part 140 detachably holds the multiple tube part including the catheter 12 . Note that FIG. 11 shows only the components necessary for explanation. The holding portion 140 has a plurality of pairs (five pairs in the illustrated example) of left and right pairs of projecting pieces 144 in the longitudinal direction of the operation plate portion 124 . Each projecting piece 144 protrudes downward from the lower surface of the operation plate portion 124 . Five sets of protruding pieces 144 are provided at equal intervals along the longitudinal direction of the operation plate portion 124, and contact and hold the catheter 12 at each location. Note that the holding portion 140 may be provided with only one set of projecting pieces 144 . Alternatively, the holding portion 140 may not be provided.

As shown in FIGS. 12A and 12B, the support member 104 includes a cylindrical shaft portion 146 and a support main body portion 148 projecting from the shaft portion 146 in the lateral direction (perpendicular to the axis of the shaft portion 146). and The axial rod portion 146 extends short in the vertical direction, and its upper end and lower end are inserted into the pair of upper and lower support holes 118 of the placement recess 116 , respectively. The support member 104 is rotatably assembled to the housing 100 with the shaft portion 146 as a base point.

A connection reinforcing portion 150 is formed on the lower side of the axial rod portion 146 so as to bulge out corresponding to the vertical width of the placement recess 116 when the support member 104 is assembled with the housing 100 . The support body portion 148 is connected to this connection reinforcement portion 150 . A pair of cam protrusions 152 are integrally formed on the upper side of the shaft rod portion 146 . The pair of cam protrusions 152 are provided at predetermined positions (positions accommodated in the window 120 when the housing 100 is assembled), and protrude to the same extent in opposite directions with the shaft portion 146 interposed therebetween.

The support member 104 has an operating member groove portion 154 at a position facing the shaft rod portion 146 and the support body portion 148 of the pair of cam protrusions 152 . In the initial state shown in FIG. 9, the operating member groove 154 extends linearly from the distal end of the cam protrusion 152 on the distal side to the most proximal end of the cam protrusion 152 on the proximal side. The operation member groove 154 is arranged at a position corresponding to the rail portion 114 and slidably accommodates the side edge of the catheter operation member 102 together with the rail portion 114 .

On the other hand, the support main body portion 148 of the support member 104 is a portion that is moved by rotation about the shaft rod portion 146 when the housing 100 is assembled. Specifically, the support main body 148 is positioned in the housing space 112 in a closed position (see FIG. 13A) in which the catheter 12 can be contacted and supported, and in a position outside the housing 100 and in the positioning recess 116 unlike the closed position. to the open position (see FIG. 13B) where it is out of contact with the catheter 12 . The angle between the closed position and the open position about the axial rod portion 146 is preferably 90° or more so that the catheter hub 14, the auxiliary member hub 24 and the needle protection member 26 can be easily removed. In the present embodiment, the angle is set to 90° so that the cam protrusion 152 is positioned within the rail portion 114 at the open position.

The support main body portion 148 is formed in an S shape having a size that substantially matches the vertical width of the placement recess 116 when viewed from the front, and has a spring force capable of being elastically deformed in the vertical direction. A raised portion 156 that protrudes slightly upward is provided on the upper surface of the support body portion 148 . The raised portion 156 contacts and supports the catheter 12 (multiple tube portion) held by the catheter operation member 102 from below when the support body portion 148 is in the closed position.

In addition, a distal inclined surface 158 that slopes downward in the distal direction is formed on the upper distal end side of the support body portion 148 , and a proximal end that slopes downward in the proximal direction is formed on the upper base end side of the support body portion 148 . An inclined surface 160 is formed. Wings 162 are integrally formed at the ends of the support body 148 connected to the protuberances 156 and protrude outwardly and downwardly away from the axial rod 146 .

A locking protrusion 164 is formed on the lower surface of the support body 148 so as to protrude downward. The locking protrusion 164 is inserted into the locking recess 122 of the housing 100 at the open position of the support body 148 . A contact projection 166 protruding in the proximal direction is provided at the proximal end of the lower side of the support body portion 148 . The contact projection 166 contacts the hub mounting portion 125 when the catheter operation member 102 advances, and guides the displacement of the support body portion 148 from the closed position to the open position separated by 90°.

The material constituting the support member 104 is not particularly limited, and for example, the materials listed for the catheter hub 14 can be selected as appropriate. Note that the support member 104 may not only be provided separately from the housing 100 , but may also be formed integrally with the housing 100 . Further, the support member 104 is not provided only on one side wall 108a of the housing 100, but may be provided on the other side wall 108b, or a pair may be provided on both of these side walls 108a and 108b. Further, the rotation direction of the support main body portion 148 is not limited to the planar direction of the housing 100, and may be a lateral direction including up and down directions.

Next, the operation and effects of the catheter assembly 10B configured as described above will be described. The method of using the catheter assembly 10B according to the present embodiment is basically the same as the method of using the catheter assembly 10A according to the first embodiment described above, so detailed description thereof will be omitted.

In the initial state of the catheter assembly 10B of the present embodiment, the support body 148 of the support member 104 assembled to the distal end of the housing 100 waits at the closed position, and as shown in FIGS. 9 and 13A, the catheter operation member The multiple pipe portions held by the plurality of holding portions 140 of 102 are supported in contact with the support body portion 148 . At this time, since the wide portion 126 of the catheter operation member 102 is positioned in the operation member groove portion 154, the rotation of the cam convex portion 152 is restricted. That is, the support body portion 148 is in a locked state that maintains the support of the catheter 12 . In addition, each holding portion 140 holds the outer peripheral surface of the catheter 12 at each point in the axial direction with a weak engaging force, thereby firmly holding the catheter 12 as a whole.

When the catheter assembly 10B is punctured, the catheter 12 is supported by the support member 104 and the catheter 12 is held by the holding portion 140, so that the multi-tube portion within the housing 100 is not affected by the resistance caused by puncture. deflection is prevented. As a result, the user can perform puncturing without discomfort. In addition, the catheter assembly 10B can be formed thinner by weakening the strength of the inner needle 16, thereby reducing the burden on the patient.

To advance the catheter 12 , the user holds the upper rib 132 and the tabs 134 , 136 of the catheter operation member 102 with a finger while fixing the position of the housing 100 to move the catheter operation member 102 toward the distal end of the housing 100 . Advance (relative movement). In the catheter assembly 10B, the holding portion 140 continues to hold the multiple tube portions, and the catheter 12 advances smoothly.

At this time, as described above, the support main body portion 148 is in a locked state that maintains the support of the catheter 12. Therefore, even if the resistance due to the insertion of the catheter 12 is received, the catheter 12, the inner needle 16, etc. It is possible to suppress bending of the multiple tube portion. As a result, the catheter 12 can be smoothly inserted into the blood vessel without discomfort.

Note that the catheter operation member 102 may be advanced and retracted with respect to the housing 100 depending on the user's preference. Even in such a case, since the support of the catheter 12 is maintained by the support body portion 148, it is possible to suppress the bending of the multiple tube portion.

When the distal end of the catheter 12 is inserted to a predetermined position in the blood vessel, the narrow portion 128 of the catheter operating member 102 is positioned in the operating member groove 154 . In this state, the restriction on the rotation of the cam protrusion 152 is released and it becomes rotatable, so that the support body 148 can be displaced from the closed position to the open position. That is, the support main body 148 is in an unlocked state in which the catheter hub 14 and the catheter operating member 102 can be removed from the housing 100 .

In this state, when the catheter operation member 102 and the catheter member 17 are relatively displaced in the distal direction with respect to the housing 100, the hub mounting portion 125 comes into contact with the contact protrusion 166 of the support body portion 148 and pushes it in the distal direction. As a result, the support main body portion 148 and the cam convex portion 152 rotate around the shaft portion 146 as a base point.

Then, when the support body 148 is rotated by a predetermined rotation angle (90°), the locking projection 164 of the support body 148 is inserted into the locking recess 122 of the housing 100, and the support body 148 is held at the open position. be done. This allows the catheter hub 14 and catheter operating member 102 to be easily removed from the housing 100 .

In using the catheter assembly 10B, the catheter operating member 102 that has been detached from the housing 100 may be reattached to the housing 100 to move the catheter 12 forward and backward with respect to the inner needle 16, depending on the user's preference.

In this case, the user inserts the proximal end of the catheter operation member 102 from the distal end side of the housing 100 by displacing the housing 100 relative to the catheter operation member 102 and the catheter member 17 in the distal direction. Then, the side edge of the operation plate portion 124 is inserted into the rail portion 114, and the stepped portion 130 of the operation plate portion 124 comes into contact with the cam projection portion 152 and pushes the cam projection portion 152 toward the base end, thereby locking the locking projection portion 164. exits from the locking recess 122 .

As a result, the cam convex portion 152 and the support body portion 148 rotate around the shaft portion 146 (reversely rotate when the catheter 12 advances), so that the support body portion 148 switches from the open state to the closed state. At this time, since the wings 162 extend obliquely downward, it is possible to prevent the wings 162 from coming into contact with the catheter 12 and causing the catheter 12 to shift laterally when the support body 148 rotates in the reverse direction. By pulling the catheter operation member 102 toward the proximal direction with respect to the housing 100 , the catheter 12 is held by the holding portion 140 while being supported by the support body portion 148 from below.

According to this embodiment, the user can switch the support member 104 from the locked state to the unlocked state simply by displacing the catheter operation member 102 toward the distal end of the catheter 12 with respect to the housing 100 . Thereby, the operability of the catheter assembly 10B can be improved. In addition, since the support member 104 is restricted from being displaced with respect to the housing 100 in the locked state, the support member 104 can stably support the catheter 12, the inner needle 16, and the like.

In this embodiment, the support member 104 is displaced from the closed state to the open state and held by advancing the catheter operation member 102 toward the distal end side with respect to the housing 100 . As a result, when the catheter hub 14 is detached from the housing 100, interference between the catheter hub 14 and the support body 148 can be suppressed, so that the catheter hub 14 can be detached from the housing 100 easily.

DESCRIPTION OF SYMBOLS 10A, 10B... Catheter assembly 12... Catheter 14... Catheter hub 16... Inner needle 16a... Needle point 18, 100... Housing 20, 102... Catheter operation member 27, 104... Support member 52, 126... Wide part 54, 128... Narrow portion 62 Support member main body 64 Cam 78 Arrangement hole 82 Stopper portion 88 Guide surface 91 Holding means

Claims (1)

a hollow catheter;
a catheter hub secured to the proximal end of the catheter;
a hollow inner needle inserted through the catheter;
a housing that supports the inner needle and in which the catheter hub is arranged in an initial state in which the tip of the inner needle protrudes from the tip of the catheter;
a support member that supports the catheter;
a catheter manipulation member connected to the catheter hub and displaceable relative to the housing along the longitudinal direction of the housing;
The housing is formed with a first support groove (38) in which the catheter is arranged,
The support member is formed with a second support groove (66) having a semicircular cross-sectional shape in which the catheter is disposed,
the catheter is slidably disposed in a space formed by the first support groove and the second support groove;
The support member is not connected to the catheter hub, and is in a first state in which the catheter is supported when the catheter advances distally with respect to the inner needle, and the catheter hub is separated from the housing. a catheter assembly mounted on the housing switchable to a second state that permits

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