JP2021090886A - Catheter assembly - Google Patents

Abstract

To provide a catheter assembly capable of naturally and smoothly inserting a catheter to a blood vessel and also facilitating separation of a catheter hub from a housing.SOLUTION: A catheter assembly 10A includes: a housing 18 which supports an inner needle 16 and where a catheter hub 14 is arranged in an initial state where a tip end of the inner needle 16 is projected from a tip end of a catheter 12; a support member 27 which supports the catheter 12; and a catheter operation member 20. A second support groove 66 is formed in the support member 27. The support member 27 is not connected to the catheter hub 14, and is arranged in the housing 18 so as to be exchangeable between a first state to support the catheter 12 when the catheter 12 advances to a tip end side with respect to the inner needle 16 and a second state to permit separation of the catheter hub 14 from the housing 18.SELECTED DRAWING: Figure 1

Description

The present invention relates to, for example, a catheter assembly in which a blood vessel is punctured and indwelled when infusing a patient.

Conventionally, for example, a catheter assembly is used when infusing or the like to a patient. This type of catheter assembly consists of a hollow catheter, a catheter hub fixed to the base end of the catheter, a hollow inner needle that is inserted into the catheter and has a sharp tip, and the base end of the inner needle. It is equipped with a needle hub fixed to.

In such a catheter assembly, the catheter hub is housed in a housing (needle hub) that can be separated vertically 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). In the initial state, the upper housing and the lower housing are locked in an engaged state so as to support the catheter. On the other hand, after the patient is punctured with the inner needle, the lock is released and the upper housing and the lower housing can be separated before the catheter is advanced (advanced) toward the tip side 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 separated from the housing.

Japanese Patent Application Laid-Open No. 2013-529111

However, in a catheter assembly as described in Patent Document 1, the engaged state of 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 catheter and the inner needle may be bent due to the resistance force (friction resistance force between the catheter and the patient's skin) received by the catheter, which may cause discomfort to the user. In addition, the tip of the inner needle may come out of the patient's skin, or the catheter may be pierced when the tip of the inner needle that comes out of the skin advances due to the restoring force.

The present invention has been made in consideration of such a problem, and a catheter assembly capable of smoothly inserting a catheter into a blood vessel without discomfort and easily disengaging a catheter hub from a housing is provided. The purpose is to provide.

One aspect of the present invention is to support 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 from the tip of the catheter. A housing in which the catheter hub is arranged in an initial state in which the tip of the inner needle protrudes, a support member for supporting the catheter, and a support member connected to the catheter hub along the longitudinal direction of the housing with respect to the housing. A support groove having a semicircular cross-sectional shape on which the catheter is arranged is formed in the support member, and the support member is connected to the catheter hub. It is possible to switch between the first state of supporting the catheter and the second state of allowing the catheter hub to separate from the housing when the catheter advances to the distal end side with respect to the inner needle. A catheter assembly provided in the housing.

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

It is a perspective view of the catheter assembly which concerns on 1st Embodiment of this invention. It is an exploded perspective view of the catheter assembly of FIG. 3A is a perspective view of the housing of FIG. 2 viewed from diagonally above, and FIG. 3B is a perspective view of the support member main body of FIG. 2 viewed from diagonally below. It is a partial vertical sectional view of the catheter assembly of 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. 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. 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. It is sectional drawing which shows the modification of the support member of FIG. It is a perspective view of the catheter assembly which concerns on 2nd Embodiment of this invention. FIG. 9 is an exploded perspective view of the catheter assembly of FIG. 9 is a perspective view of the catheter operating member and the catheter member of FIG. 9 as viewed from below. 12A is a perspective view of the support member of FIG. 10 viewed from diagonally below, and FIG. 12B is a perspective view of the support member of FIG. 10 viewed from diagonally above. 13A is a plan view of the support member of FIG. 9 in the closed position as viewed from below, and FIG. 13B is a plan view of the support member of FIG. 9 in the open position as viewed from below.

Hereinafter, a suitable embodiment of the catheter assembly according to the present invention will be described with reference to the accompanying drawings.

(First Embodiment)
The catheter assembly 10A according to the present embodiment showing the initial state shown in FIG. 1 is applied when infusion or blood transfusion is performed on a patient (living body), and is punctured and indwelled in the patient's body to construct an introduction part for a drug solution or the like. To do. The catheter assembly 10A can be configured as a catheter (eg, central venous catheter, PICC, midline catheter, etc.) that is longer than the peripheral venous catheter. The catheter assembly 10A may be configured as a peripheral venous catheter. Further, the catheter assembly 10A is not limited to the intravenous 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 that is retractably inserted into the catheter 12, and an inner needle. The housing 18 that holds 16 fixedly, the catheter operating member 20 that is mounted on the upper side of the catheter hub 14, the auxiliary member 22 that is detachably inserted between the catheter 12 and the inner needle 16, and the auxiliary member 22 are fixedly held. Auxiliary member hub 24, a needle protection member 26 connected to the catheter hub 14 and the proximal end of the auxiliary member hub 24, and a support member 27 provided in the housing 18 to support the catheter 12 are provided. A part of the inner needle 16 may be cut out along the axial direction. Further, the inner needle 16 may be a solid needle.

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

The catheter 12 is flexible and has a lumen 13 penetrating inside. The lumen 13 is formed to have a diameter capable of accommodating the inner needle 16 and the auxiliary member 22 and allowing the drug solution, blood, etc. to flow. The tip of the catheter 12 is reduced in diameter to reduce puncture resistance. The length of the catheter 12 is not particularly limited and can be appropriately designed according to the application, various conditions, etc., for example, it is set to about 14 to 500 mm, set to about 30 to 400 mm, or set to about 76 to 200 mm. Set.

The constituent material of the catheter 12 is not particularly limited, but a soft resin material is preferable, for example, polytetrafluoroethylene (PTFE), ethylene / tetrafluoroethylene copolymer (ETFE), perfluoroalkoxy alkane resin. Examples thereof include fluororesins such as (PFA), olefin resins such as polyethylene and polypropylene, or mixtures thereof, polyurethanes, polyesters, polyamides, polyether nylon resins, and mixtures of olefin resins with ethylene / vinyl acetate copolymers. Be done.

The base end portion of the catheter 12 is fixed to the tip end portion in the catheter hub 14 by an appropriate fixing method (caulking, fusion, adhesion, etc.). The catheter member 17 is composed of the catheter 12 and the catheter hub 14.

The catheter hub 14 is exposed on the patient's skin with the catheter 12 inserted into the blood vessel, attached with tape or the like, and placed together with the catheter 12. The catheter hub 14 is formed in a tubular shape that tapers toward the tip end.

The constituent material of the catheter hub 14 is not particularly limited, but for example, a thermoplastic resin 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 hemostatic valve, a plug, or the like (not shown) that prevents backflow of blood when the inner needle 16 is punctured and enables infusion when the connector of the infusion tube is inserted.

As shown in FIG. 2, an annular protrusion 28 is formed near the tip of the outer peripheral surface of the catheter hub 14 so as to project outward in the radial direction and circulate in the circumferential direction of the catheter hub 14. A threaded portion 30 that projects radially outward in a flange shape and extends in the circumferential direction is provided on the proximal end side of the catheter hub 14, and a connector of an infusion tube (not shown) is connected after the inner needle 16 is detached. To.

On the other hand, the inner needle 16 of the catheter assembly 10A is formed of a hollow tube having rigidity capable of puncturing the skin of a living body, and is arranged 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 total length longer than that of the catheter 12, and a sharp needle tip 16a is provided at the tip thereof.

In the initial state shown in FIG. 1, the multi-tube portion exposes the needle tip 16a from the catheter 12 and the auxiliary member 22. Inside the inner needle 16, a lumen penetrating the inner needle 16 in the axial direction is provided, 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 checking flashback along the axial direction.

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

A part of the multi-tube portion, a catheter hub 14, a catheter operating member 20, an auxiliary member hub 24, a needle protection member 26, and a support member 27 are arranged (accommodated) in the housing 18 in an initial state. The resin material constituting the housing 18 is not particularly limited, but for example, the material mentioned in the catheter hub 14 can be appropriately selected.

As shown in FIG. 2, the housing 18 includes a lower wall 32, a pair of first side walls 34a and 34b protruding upward from the side side of the lower wall 32 on the distal end side, and a side side of a base end portion of the lower wall 32. It has a pair of second side walls 35a and 35b projecting upward from the side, and a needle holding portion 36 projecting upward from the upper surface of the base end portion of the lower wall 32 to fix and support the base end portion of the inner needle 16.

As shown in FIGS. 3A and 4, the lower wall 32 has a tip extending upward from the base end side, and the upper surface of the tip 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 arranged in the center of the upper surface of the tip of the lower wall 32 in the width direction (direction orthogonal to the longitudinal direction and the vertical direction of the housing 18). 38 is formed along the longitudinal direction. A first recess 40 having a semicircular cross-sectional shape is formed at the center of the inner surface of the first support groove 38 in the longitudinal direction. As a result, 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 recess 40 is not limited to the semicircular shape, and may be an arc shape other than the semicircular shape. Further, in the catheter assembly 10A, the first support groove 38 and the first recess 40 may not be provided. In this case, the catheter 12 comes into contact with the upper surface of the tip of the lower wall 32.

The pair of first side walls 34a and 34b extend in parallel with the lower wall 32 in the longitudinal direction, and are formed so that the vertical width on the tip side is narrower than the vertical width on the base end side. Notches 42a and 42b that open to the tip side are formed at substantially the center of each of the first side walls 34a and 34b in the vertical direction. Further, a rectangular fitting hole 44 extends in the longitudinal direction slightly on the proximal end side of the notch 42a of the first side wall 34a. The cutouts 42a, 42b and the fitting hole 44 are for holding the support member 27 with respect to the housing 18. The pair of second side walls 35a and 35b extend parallel to the longitudinal direction together with the lower wall 32, and have a constant vertical width. The needle holding portion 36 is located between the pair of second side walls 35a and 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 also moves with respect to the catheter 12 as the housing 18 moves. It is moved toward the base end. That is, the housing 18 also has a function as a needle hub fixed to the base end of the inner needle 16. The needle holding portion 36 may be formed separately from the housing 18 and adhesively fixed to the housing 18.

In the catheter assembly 10A, as shown in FIG. 1, the catheter hub 14 and the needle protection member 26 are exposed from the housing 18 in the initial state. The catheter assembly 10A may be configured to surround the catheter hub 14, the needle protection member 26, etc. by forming a side wall in the center of the housing 18 in the longitudinal direction, and may form an upper wall on the housing 18 or attach a lid. It may be configured to cover the catheter hub 14, the needle protection member 26, or the like.

When the catheter operating member 20 is attached to the catheter hub 14, the catheter 12 and the catheter hub 14 are moved back and forth relative to the inner needle 16 and the housing 18. Specifically, the catheter operating member 20 is integrated with the flat plate portion 46 extending in the tip and proximal directions, the operating portion 48 extending slightly upward from the distal end of the flat plate portion 46 in the proximal direction, and the proximal end of the flat plate portion 46. It has a hub mounting portion 50 that is molded and can be attached to and detached from the catheter hub 14.

The operation unit 48 is a portion where the user's fingers are touched and the catheter 12 is moved forward and backward. Since the flat plate portion 46 is formed to be thin, the flat plate portion 46 has flexibility that can be easily bent in a direction orthogonal to the surface direction of the flat plate portion 46. The material constituting the flat plate portion 46 (catheter operating member 20) is not particularly limited, but for example, the material mentioned in the catheter hub 14 can be appropriately selected.

The flat plate portion 46 includes a wide portion (cam holding portion) 52 extending with a constant width dimension from the tip thereof to slightly in front of the base end, and a narrow portion having a constant width dimension constituting the base end portion of the flat plate portion 46. It has (cam holding release unit) 54.

The narrow portion 54 is formed by cutting out a side portion of the base end portion of the flat plate portion 46 in the direction in which the fitting hole 44 is located. A first inclined surface 56 is formed on the side surface of the boundary portion between the wide portion 52 and the narrow portion 54 in the direction in which the fitting hole 44 is located so as to be inclined toward the tip end direction. ing. The hub mounting portion 50 is configured so that the catheter hub 14 can be displaced (advanced) toward the distal end side by operating in the distal end direction. The hub mounting portion 50 can rotate in the circumferential direction with respect to the catheter hub 14 in a state of being mounted on the catheter hub 14.

The auxiliary member 22 is removably inserted inside the catheter 12 in order 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 a flexible and long member. Specifically, in the initial state of the catheter assembly 10A, the auxiliary member 22 is arranged between the catheter 12 and the inner needle 16 along the extending direction of the catheter 12. In the present embodiment, the auxiliary member 22 is formed in a tubular shape, and the inner needle 16 is inserted into the lumen of the auxiliary member 22.

In the case of the present embodiment, in the initial state of the catheter assembly 10A, the most advanced portion of the auxiliary member 22 is located closer to the proximal end side than the most advanced portion of the catheter 12. The most advanced portion of the auxiliary member 22 may be located at the same position as the most advanced portion of the catheter 12, or may be located on the distal end side of the most advanced portion 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 cut out in a part in the circumferential direction of a circle, or a shape having an arc-shaped cross section of less than 180 ° in the circumferential direction. But it may be. Further, the auxiliary member 22 may be configured to have a gap penetrating the inside and outside of the auxiliary member 22, for example, a coil shape or a mesh shape.

Examples of the constituent material of the auxiliary member 22 include a resin material (for example, one or more materials selected from the resin materials exemplified as the constituent material of the catheter 12) and a metal material (for example, stainless steel, superelastic alloy, etc.). ..

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

In the catheter assembly 10A, when the diameter of the catheter 12 is relatively large and the need for assistance (support) from the inside for strengthening the rigidity is low, the auxiliary 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 or without the auxiliary tube. There is 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.

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

A leaf spring-shaped 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 retracts with respect to the needle protection member 26 and the needle tip 16a of the inner needle 16 moves toward the proximal end side of the shutter 58, the pressure on the shutter 58 by the inner needle 16 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 base end portion of the needle protection member 26 so that the inner needle 16 does not come out from 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 removable from the tip of the housing 18. The resin material constituting the support member 27 is not particularly limited, but for example, the material mentioned in 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 with respect to the housing 18. The lower surface of the support member main body 62 facing the lower wall 32 projects downward in an arc shape. The lower portion of the base end surface of the support member main body 62 is inclined downward toward the tip end (see FIG. 3B).

On 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 arranged is provided along the longitudinal direction from the tip end surface to the proximal end surface of the support member main body 62. It is formed so as to face the. A second recess 68 having a semicircular cross-sectional shape is formed in the center of the inner surface of the second support groove 66 in the longitudinal direction. As a result, the sliding resistance between the outer surface of the catheter 12 and the inner surface of the second support groove 66 can be suitably suppressed.

The cross-sectional shape of the second support groove 66 and the second recess 68 is not limited to the semicircular shape, and may be an arc shape other than the semicircular shape. Further, in the catheter assembly 10A, the second support groove 66 and the second recess 68 may not be provided. In this case, the catheter 12 comes into contact with the lower surface of the support member main body 62.

The catheter 12 is slidably arranged in the space formed 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 main 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.

The side surfaces of the support member main body 62 facing the first side walls 34a and 34b are provided with convex portions 70a and 70b to be inserted into the notches 42a and 42b. By inserting the convex portions 70a and 70b into the notch portions 42a and 42b, the displacement of the support member main body 62 with respect to the housing 18 in the proximal direction and the displacement in the vertical direction are regulated. As a result, the support member main body 62 is firmly held against the housing 18, so that the support member main body 62 can support the catheter 12 more stably.

In the catheter assembly 10A, at least one of the pair of protrusions 70a and 70b may not be provided. In this case, the notches 42a and 42b corresponding to the convex portions 70a and 70b may not be provided. Even with such a configuration, the support member main body 62 can be held against the housing 18 by the cam 64.

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

The first arrangement hole 74 and the second arrangement hole 76 form one arrangement hole 78 in which the cam 64 is arranged. The first arrangement hole 74 extends from substantially the center in the longitudinal direction of the support member main body 62 to the proximal end surface. The second arrangement hole 76 has a rectangular opening on the side surface of the support member main body 62, and communicates with the fitting hole 44 in a state where the support member main body 62 is mounted on the housing 18. In the longitudinal direction of the support member main body 62, the second arrangement hole 76 is formed shorter than the first arrangement hole 74 and longer than the fitting hole 44.

Further, above the insertion holes 72 of the support member main body 62, a pair of through holes 80a and 80b penetrating 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). Is formed.

The cam 64 is displaceably arranged in the arrangement hole 78 at a first position where the cam 64 is fitted into the fitting hole 44 and a second position where the cam 64 is separated from the fitting hole 44. By fitting the cam 64 into the fitting hole 44, the support member main body 62 is held with respect to the housing 18.

The cam 64 is a T-shaped flat plate member, and has a stopper portion 82 arranged in the first arrangement hole 74 and a protruding portion 84 protruding from the stopper portion 82 toward the second arrangement hole 76. Have. In the longitudinal direction of the support member main body 62, the stopper portion 82 is formed longer than the second arrangement hole 76. As a result, even when the support member main body 62 is separated from the housing 18, the cam 64 is prevented (prevented) from coming out of the arrangement hole 78.

On the surface of the stopper portion 82 facing the flat plate portion 46, a second inclined surface 86 inclined toward the protruding portion 84 side toward the distal end side of the catheter 12 is formed. 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.

On the surface of the protruding portion 84 that points toward the tip of the catheter 12, a guide surface 88 that is inclined toward the proximal end of the catheter 12 is formed toward the side opposite to the flat plate portion 46. That is, since the tip portion of the protruding portion 84 is gradually formed to be narrower toward the tip end, it can be fitted (inserted) into the fitting portion.

As shown in FIG. 5A, in a state where the wide portion 52 is located in the insertion hole 72, the cam 64 has a position in which the protruding portion 84 fits into the fitting hole 44 when the stopper portion 82 comes into contact with the wide portion 52. It is held in one position. That is, the support member main body 62 is in a locked state for maintaining the support of the catheter 12. Therefore, when the catheter operating member 20 is displaced toward 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, the support member main body 62 is moved from the housing 18 even if a resistance force acts on the catheter 12. It is possible to suppress withdrawal.

In the locked state in which the cam 64 is held in the first position, the guide surface 88 comes into 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 located in the insertion hole 72, the contact between the stopper portion 82 and the wide portion 52 is released, so that the cam 64 has a fitting hole from the first position. It can be displaced to the second position away from 44. That is, the support member main body 62 is in an unlocked state in which it can be detached from the housing 18 (allowing the catheter hub 14 to be detached from the housing 18).

Therefore, when the catheter operating 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 (support member main body 62 and cam 64) is displaced in the distal direction with respect to the housing 18. When 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 is separated 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 separated 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 action and effect of the catheter assembly 10A configured as described above will be described.

In the catheter assembly 10A in the initial state 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 mounted on the hub mounting portion 50 of the catheter operating member 20. It is integrally arranged in the housing 18.

Further, in the initial state, the multi-tube portion in which the catheter 12, the auxiliary member 22, and the inner needle 16 are concentrically overlapped is supported by the support member 27. Specifically, the catheter 12 came into contact with both the housing 18 and the support member 27 by being arranged in the space composed of the first support groove 38 of the housing 18 and the second support groove 66 of the support member 27. It is supported in the state. At this time, since the wide portion 52 of the catheter operating member 20 is located in the insertion hole 72 of the support member main body 62, the cam 64 is held at the first position where it is fitted into the fitting hole 44. That is, the support member main body 62 is in a locked state for maintaining the support of the catheter 12.

When the catheter assembly 10A is used, first, a puncture operation is performed to puncture the catheter assembly 10A into the skin of the patient. In the puncture operation, the user (doctor, nurse, etc.) holds the housing 18 and presses the tip of the catheter assembly 10A (the tip of the catheter 12 through which the inner needle 16 is inserted) against the patient. , Puncture the skin toward the target blood vessel. As a result, the tips of the inner needle 16 and the catheter 12 are punctured into the skin. At the time of this puncture, as described above, since the catheter 12 is supported by the support member 27, the bending of the multi-tube portion in the housing 18 is suppressed even if the resistance force due to the puncture is received. As a result, the user can perform the puncture without discomfort.

Next, as shown in FIG. 6A, the user operates the catheter operating member 20 in the distal direction while fixing the position of the housing 18 to advance the catheter member 17 (catheter 12 and catheter hub 14). In this case, for example, the user puts his / her finger on the operation unit 48 of the catheter operation member 20 to advance the catheter operation member 20 in the distal direction relative to the housing 18. In FIG. 6A, the catheter operating member 20 remains linear, but in reality, the catheter while bending the flat plate portion 46 of the catheter operating member 20 upward so that the catheter operating member 20 does not come into contact with the patient's skin. The operating member 20 is advanced.

At this time, as described above, since the support member main body 62 is in the locked state for maintaining the support of the catheter 12, the catheter 12 and the inner needle 16 and the like are subjected to the resistance force due to the insertion of the catheter 12. It is possible to prevent the multi-tube portion from bending. As a result, the catheter 12 can be smoothly inserted into the blood vessel without any discomfort.

At this time, the catheter operating member 20 may be moved back and forth with respect to the housing 18 depending on the preference of the user. Even in such a case, since the support of the catheter 12 is maintained by the support member main body 62, it is possible to suppress the multi-tube portion from bending.

When the tip of the catheter 12 is inserted to a predetermined position in the blood vessel, the narrow portion 54 of the catheter operating member 20 is located in the insertion hole 72 of the support member main body 62. In this state, the contact between the stopper portion 82 and the wide portion 52 is released, so that 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 detached from the housing 18.

Next, the user pulls the housing 18 toward the proximal end while holding the positions of the catheter operating member 20 and the catheter member 17. Then, the housing 18 is displaced relative to the support member 27 in the proximal direction, and the guide surface 88 is pushed toward the narrow portion 54 by the corners 90 of the first side walls 34a and 34b, so that the cam 64 is fitted. It separates from the 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. Further, the pair of convex portions 70a and 70b are separated from the notched portions 42a and 42b.

Depending on the preference of the user, the catheter operating member 20 may be further displaced toward the tip end side with respect to the housing 18 while maintaining the position of the housing 18. Even in this case, since 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 toward the tip end, the support member 27 is displaced in the distal end direction relative to the housing 18. At the same time, the guide surface 88 is pushed toward the narrow portion 54 by the corner portion 90, so that the cam 64 is separated from the fitting hole 44 and displaced to the second position.

Then, when the housing 18 is further pulled toward the proximal end, as shown in FIG. 6B, the support member main body 62 and the cam 64 (support member 27) pushed in the distal end direction by the hub mounting portion 50 are separated from the housing 18, and the catheter The member 17 and the 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 arrangement hole 76 in the longitudinal direction of the support member main body 62, the cam 64 does not come out of the arrangement hole 78.

Further, the safety function by the needle protection member 26 and the shutter 58 is exhibited. That is, as the needle tip 16a moves toward the proximal end side of the shutter 58 in the needle protection member 26, the shutter 58 blocks the needle insertion passage in the needle protection member 26. As a result, the re-projection of the inner needle 16 from the tip of the needle protection member 26 is prevented. Further, since the retaining member 60 prevents the inner needle 16 from coming out from the base end side of the needle protecting member 26, the protection of the needle tip 16a by the needle protecting member 26 is preferably maintained.

Further, when the housing 18 is further pulled toward the proximal end from the state of FIG. 6B, the connection between the catheter hub 14 and the needle protection member 26 is released. As a result, as shown in FIG. 7A, the needle protection member 26 is separated from the catheter hub 14. At this time, since the auxiliary member hub 24 and the needle protection member 26 are connected, the auxiliary member hub 24 is pulled toward the proximal end by the needle protection member 26, and the auxiliary member 22 is also removed from the catheter 12.

Next, the user detaches the catheter operating member 20 from the catheter hub 14, as shown in FIG. 7B. As a result, the catheter member 17 is placed in the patient. The catheter operating member 20 may be left 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 base end side (base end portion of the catheter hub 14) of the catheter member 17 in a state where the inner needle 16 and the auxiliary member 22 are removed, and the infusion tube is transferred to the patient. Administer an infusion solution (drug solution).

In the above description, after the support member 27 is detached from the housing 18, the catheter member 17 and the catheter operating member 20 are 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 and the catheter 12 may be moved back and forth with respect to the inner needle 16.

In this case, the user inserts the base end of the support member main body 62 from the tip end side of the housing 18 by displacing the housing 18 toward the tip end side while holding the positions of the catheter operating member 20 and the catheter member 17. As a result, the convex portions 70a and 70b are inserted into the notch portions 42a and 42b, and the second arrangement hole 76 communicates with (opposes) the fitting hole 44.

Then, in this state, the catheter operating member 20 is slid toward the proximal end while maintaining the position of the housing 18. Then, the second inclined surface 86 is pushed toward the fitting hole 44 by the first inclined surface 56, so that the cam 64 is displaced from the second position to the first position and fitted 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 in the first position.

In the operation of attaching the support member 27 to the housing 18, the catheter operating member 20 and the catheter member 17 are slid toward the proximal end while maintaining the position of the housing 18, so that the proximal end of the support member main body 62 is attached to the housing 18. It may be inserted from the tip side of the.

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 in the second position (see FIG. 8). As the holding means 91, for example, a configuration may be adopted in which the convex portion 92 provided on the cam 64 is fitted into the concave portion 94 formed on the wall surface forming the arrangement hole 78.

Further, the holding means 91 may be configured such that a convex portion is provided on the wall surface forming the arrangement hole 78 to form a concave portion in the cam 64, or the wall surface forming the arrangement hole 78 and the convex portion that engage with each other on the cam 64. It may be configured to provide. The holding means 91 is set to 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 holding of the second position of the cam 64 is released. ing. When such a holding means 91 is provided, it is suppressed that a part of the cam 64 protrudes from the arrangement hole 78 (the cam 64 becomes an obstacle), so that the support member 27 is smoothly attached to the housing 18. Can be inserted into.

Further, in the above description, when the needle protection member 26 is separated from the catheter hub 14, the auxiliary member hub 24 is left connected to the needle protection member 26, and the auxiliary member 22 is 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, and the assembly of the auxiliary member 22 and the catheter 12 is inserted into the blood vessel. You may insert it.

As described above, in the present embodiment, the support member 27 is in a locked state for maintaining the support of the catheter 12 when the catheter 12 advances toward the distal end side with respect to the inner needle 16 and from the housing 18 of the catheter hub 14. The housing 18 is provided so as to be switchable to an unlocked state that allows 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, since the user can switch the support member 27 from the locked state to the unlocked state simply by displacing the catheter operating member 20 toward the tip end side of the catheter 12 with respect to the housing 18, the operability of the catheter assembly 10A can be improved. Can be improved. Further, since the displacement of the support member 27 with respect to the housing 18 is restricted in the locked state, the support member 27 can stably support the multi-tube portion such as the catheter 12 and the inner needle 16.

Furthermore, since the support member 27 is separated from the housing 18 by the catheter operating member 20 being displaced relative to the distal end side of the catheter 12 with respect to the housing 18 in the unlocked state, the catheter hub 14 and the catheter operating member 20 Can be easily detached from the housing 18.

According to the present embodiment, while the wide portion 52 is located in the insertion hole 72, the cam 64 is held in the first position where the cam 64 is fitted in the fitting hole 44, and the support member 27 is locked. The catheter 12 can be stably supported by the member body 62. Further, by displacing the catheter operating member 20 relative to the tip end side of the catheter 12 with respect to the housing 18 and locating 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 is unlocked because it can be displaced to the second position where it is disengaged. Therefore, the support member 27 can be switched between the locked state and the unlocked state with a simple configuration. Further, the cam 64 can be easily displaced from the first position to the second position by the action of the guide surface 88 formed on the cam 64.

According to the present embodiment, the stopper portion 82 can prevent the cam 64 from separating from the arrangement hole 78, so that the operability of the catheter assembly 10A can be improved.

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

As shown in FIGS. 9 and 10, the catheter assembly 10B according to the present 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, and a needle. It includes a protective member 26 and a support member 104.

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

An accommodation space 112 for accommodating a part of the multi-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 are formed so as to extend in parallel with the lower wall 106 in the longitudinal direction, the vertical widths of the base end side and the intermediate side are constant, and the vertical width of the tip side is wider than that of the intermediate side. ing. A groove-shaped rail portion 114 in which the inner surfaces of the side walls 108a and 108b are cut in a straight line is provided on the upper portion of the side walls 108a and 108b on the tip end side. The rail portion 114 accommodates the left and right side edges of the catheter operating member 102 and guides the advance / retreat of the catheter operating member 102. One side wall 108a is provided with an arrangement recess 116 for attaching the support member 104.

The placement recess 116 is cut out from the tip of the side wall 108a toward the proximal end and is located between the lower wall 106 and the rail portion 114. A pair of upper and lower bearing holes 118 for rotatably attaching the support member 104 are provided on the lower wall 106 and the side wall 108a at the position where the arrangement recess 116 is formed. At a position overlapping the rail portion 114 (between the upper support hole portion 118 and the arrangement recess 116), a window 120 in which the cam convex portion 152 of the support member 104 described later is housed is provided (see FIG. 12B). .. The lower wall 106 is formed with a locking recess 122 into which the locking convex portion 164 is inserted when the support main body portion 148 of the support member 104 moves to the open position (position in FIG. 13B).

The catheter operating member 102 is made of the same material as the catheter operating member 20 described in the first embodiment, and by directly holding the catheter 12 and attaching it to the catheter hub 14, the catheter operating member 102 is attached to the inner needle 16 and the housing 100. The catheter 12 and the catheter hub 14 are relatively advanced and retracted. Specifically, the catheter operating member 102 includes an operation plate portion 124 extending in the direction of the tip end and the proximal end, and a hub mounting portion 125 integrally molded at the proximal end of the operation plate portion 124 and detachably attached to the catheter hub 14. Has.

Further, the catheter operating member 102 is provided in 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 having a constant width dimension provided on the hub mounting portion 125. It has a (cam holding / releasing portion) 128. 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 where the user's finger is touched and the catheter 12 is moved forward and backward. The 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 108a and 108b 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 that can be easily bent in a direction orthogonal to the surface direction of the operation plate portion 124.

As shown in FIGS. 9 to 11, upper ribs 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. The upper rib 132 and the lower rib 142 project vertically and extend linearly along the width direction of the operation plate portion 124, thereby increasing 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 in 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 108a and 108b and the rail portion 114.

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

As shown in FIG. 11, the holding portion 140 holds the multi-tube portion including the catheter 12 in a detachable manner. Note that FIG. 11 shows only the components necessary for the explanation. The holding portion 140 has a plurality of sets of projecting pieces 144 on the left and right in the longitudinal direction of the operation plate portion 124 (five sets in the illustrated example). Each projecting piece 144 projects downward from the lower surface of the operation plate portion 124. The five sets of projecting pieces 144 are provided at equal intervals along the longitudinal direction of the operation plate portion 124, and are held in contact with the catheter 12 at each location. 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 has a columnar shaft rod portion 146 and a support main body portion 148 projecting laterally (in a direction orthogonal to the axis of the shaft rod portion 146) from the shaft rod portion 146. And have. The shaft rod portion 146 extends shortly in the vertical direction, and its upper end portion and lower end portion are inserted into a pair of upper and lower support hole portions 118 of the arrangement recess 116, respectively. The support member 104 is rotatably assembled to the housing 100 with the shaft rod portion 146 as a base point.

On the lower side of the shaft rod portion 146, a connecting reinforcing portion 150 corresponding to the vertical width of the arrangement recess 116 is formed to bulge in the assembled state of the housing 100 of the support member 104. The support main body portion 148 is connected to the connection reinforcing portion 150. Further, a pair of cam convex portions 152 are integrally molded on the upper side of the shaft rod portion 146. The pair of cam convex portions 152 are provided at predetermined positions (positions accommodated in the window 120 in the assembled state of the housing 100), and project in opposite directions and to the same extent with the shaft rod portion 146.

The support member 104 has a groove portion 154 for an operation member at a position facing the support main body portion 148 of the shaft rod portion 146 and the pair of cam convex portions 152. In the initial state shown in FIG. 9, the groove portion 154 for the operating member extends linearly from the tip end of the cam convex portion 152 on the distal end side to the most proximal end of the cam convex portion 152 on the proximal end side. The operating member groove portion 154 is arranged at a position corresponding to the rail portion 114, and slidably accommodates the side edge of the catheter operating 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 moves by rotation with the shaft rod portion 146 as a base point in the assembled state of the housing 100. Specifically, the support main body 148 is located in the closed position (see FIG. 13A) where the catheter 12 can be contact-supported by being located in the accommodation space 112, and is located outside the housing 100 and in the placement recess 116 unlike the closed position. Then, the catheter 12 is displaced to an open position (see FIG. 13B) that is not in contact with the catheter 12. The angle between the closed position and the open position around the shaft 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 pulled out. In the present embodiment, the cam convex portion 152 is set to 90 ° so as to be located in the rail portion 114 in the open position.

The support main body portion 148 is formed in an S shape having a size substantially matching the vertical width of the arrangement recess 116 when viewed from the front, and has a spring force that can be elastically deformed in the vertical direction. A raised portion 156 that slightly rises upward is provided on the upper surface of the support main body portion 148. The raised portion 156 contacts and supports the catheter 12 (multi-tube portion) held by the catheter operating member 102 at the closed position of the support main body portion 148 from below.

Further, a tip inclined surface 158 that inclines downward in the tip direction is formed on the upper tip side of the support main body 148, and a base end that inclines downward in the proximal direction on the upper base end side of the support main body 148. An inclined surface 160 is formed. Further, at the end portion of the support main body portion 148 connected to the raised portion 156, a wing 162 is integrally formed so as to be inclined outward and downward in the width direction away from the shaft rod portion 146.

On the lower surface of the support main body portion 148, a locking convex portion 164 is formed so as to project downward. The locking convex portion 164 is inserted into the locking recess 122 of the housing 100 at the open position of the support main body portion 148. Further, a contact protrusion 166 projecting in the direction of the base end is provided at the base end on the lower side of the support main body portion 148. The contact protrusion 166 contacts the hub mounting portion 125 when the catheter operating member 102 advances, and induces a displacement of the support main body portion 148 to an open position 90 ° away from the closed position.

The material constituting the support member 104 is not particularly limited, and for example, the material mentioned in the catheter hub 14 can be appropriately selected. The support member 104 is not only provided separately from the housing 100, but may be integrally molded 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 may be provided as a pair 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 plane direction of the housing 100, but may be a side surface direction including up and down.

Next, the action and effect of the catheter assembly 10B configured as described above will be described. Since 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, detailed description thereof will be omitted.

In the initial state of the catheter assembly 10B of the present embodiment, the support main body 148 of the support member 104 assembled to the tip of the housing 100 stands by in a closed position, and as shown in FIGS. 9 and 13A, the catheter operating member The multi-tube portion held by the plurality of holding portions 140 of 102 is contact-supported by the support main body portion 148. At this time, since the wide portion 126 of the catheter operating member 102 is located in the groove portion 154 for the operating member, the rotation of the cam convex portion 152 is restricted. That is, the support main body 148 is in a locked state for maintaining the support of the catheter 12. Further, each holding portion 140 holds the outer peripheral surface of the catheter 12 with a weak engaging force at each position in the axial direction, and firmly holds the catheter 12 as a whole.

When the catheter assembly 10B is punctured, the support member 104 supports the catheter 12 and the holding portion 140 holds the catheter 12, so that the multi-tube portion in the housing 100 is subjected to the resistance force due to the puncture. Bending is prevented. As a result, the user can perform the puncture without discomfort. Further, the catheter assembly 10B can be formed thinner by weakening the strength of the inner needle 16, and the burden on the patient can be reduced.

In the advance operation of the catheter 12, the user puts a finger on the upper rib 132 or the tabs 134 and 136 of the catheter operating member 102 while fixing the position of the housing 100, and moves the catheter operating member 102 toward the tip of the housing 100. Advance (relative movement). In the catheter assembly 10B, the holding portion 140 continues to hold the multi-tube portion, and the catheter 12 smoothly advances.

At this time, as described above, since the support main body 148 is in a locked state for maintaining the support of the catheter 12, the catheter 12 and the inner needle 16 and the like are subjected to the resistance force due to the insertion of the catheter 12. It is possible to prevent the multi-tube portion from bending. As a result, the catheter 12 can be smoothly inserted into the blood vessel without any discomfort.

The catheter operating member 102 may be moved back and forth 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 main body portion 148, it is possible to suppress the multi-tube portion from bending.

When the tip 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 located in the groove portion 154 for the operating member. In this state, the restriction on the rotation of the cam convex portion 152 is released and the cam convex portion 152 can rotate, so that the support main body portion 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 detached from the housing 100.

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

Then, when the support main body 148 is rotated by a predetermined rotation angle (90 °), the locking convex portion 164 of the support main body 148 is inserted into the locking recess 122 of the housing 100, and the support main body 148 is held in the open position. Will be done. As a result, the catheter hub 14 and the catheter operating member 102 can be easily separated from the housing 100.

In the use of the catheter assembly 10B, the catheter operating member 102 detached from the housing 100 may be reattached to the housing 100 and the catheter 12 may be moved back and forth with respect to the inner needle 16 depending on the preference of the user.

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

As a result, the cam convex portion 152 and the support main body portion 148 rotate around the shaft rod portion 146 as a base point (rotation opposite to that when the catheter 12 advances), so that the support main body portion 148 switches from the open state to the closed state. At this time, since the wing 162 extends diagonally downward, it is possible to prevent the wing 162 from coming into contact with the catheter 12 and the catheter 12 to be laterally displaced when the support main body portion 148 is rotated in the reverse direction. Then, by pulling the catheter operating member 102 toward the proximal end with respect to the housing 100, the catheter 12 is held by the holding portion 140 in a state of being supported from below by the supporting main body portion 148.

According to the present embodiment, the user can switch the support member 104 from the locked state to the unlocked state simply by displacing the catheter operating member 102 toward the tip end side of the catheter 12 with respect to the housing 100. Thereby, the operability of the catheter assembly 10B can be improved. Further, since the displacement of the support member 104 with respect to the housing 100 is restricted in the locked state, the support member 104 can stably support the multi-tube portion such as the catheter 12 and the inner needle 16.

In the present embodiment, the support member 104 is displaced and held from the closed state to the open state by advancing the catheter operating member 102 toward the distal end side with respect to the housing 100. As a result, it is possible to prevent the catheter hub 14 from interfering with the support main body portion 148 when the catheter hub 14 is detached from the housing 100, so that the catheter hub 14 can be easily detached from the housing 100.

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

Claims (1)

With a hollow catheter
A catheter hub fixed to the base end of the catheter and
A hollow inner needle inserted through the catheter and
A housing that supports the inner needle and is arranged with the catheter hub 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 and
A catheter operating member connected to the catheter hub and displaceable with respect to the housing along the longitudinal direction of the housing.
The support member is formed with a support groove having a semicircular cross-sectional shape on which the catheter is arranged.
The support member is not connected to the catheter hub, and the first state of supporting the catheter when the catheter advances to the distal side with respect to the inner needle and the detachment of the catheter hub from the housing. A catheter assembly provided in the housing that can be switched to a second state that allows for.

Images