JP2020175268A - Catheter assembly - Google Patents

Abstract

To provide a catheter assembly capable of suppressing as much as possible, bending of a catheter and an inner needle, for advancing the catheter preferably into a blood vessel.SOLUTION: A catheter assembly 10 comprises: a housing 24 for fixing and holding an inner needle 18 and storing a catheter hub 14 in a manner of capable of displacing in an axial direction. The housing 24 comprises a first part 40 and a second part 50 so as to be separated freely so as to allow advance of the catheter hub 14 to an external part. The catheter assembly 10 has a restraining member 60 capable of restraining the first part 40 and the second part 50. The restraining member 60 restrains both of the first part 40 and the second part 50 so as to maintain regulation of separation, and releases restraining of the first part 40 and the second part 50 following movement of a catheter operation member 70 with respect to the first part 40 and the second part 50 in a tip end direction.SELECTED DRAWING: Figure 1

Description

The present invention relates to, for example, a catheter assembly used for infusion, blood transfusion, etc. to a patient.

When infusing or transfusing a patient, the catheter assembly forms a fluid inlet that connects the patient's blood vessels to an external infusion set. As disclosed in Patent Document 1, this type of catheter assembly includes a hollow catheter, a catheter hub that fixes and holds the base end of the catheter, and an internal needle that has a needle tip and is inserted into the inside of the catheter. And a housing for fixing and holding the base end of the inner needle. Further, in the catheter assembly disclosed in Patent Document 1, in order to insert the catheter deep inside the body, a long catheter and an internal needle are doubly stacked and housed in the housing.

When using the catheter assembly, doctors, nurses, etc. puncture the patient with the catheter and the internal needle, advance the catheter relative to the internal needle, and insert it into the blood vessel. Upon advancement of the catheter, the housing is separated vertically from the tip so that the catheter and catheter hub can be removed from the separated portion of the housing. As a result, the catheter and catheter hub are separated from the inner needle and housing and placed in the patient.

Special Table 2013-529111

By the way, in the configuration in which the housing is divided into upper and lower parts as in the catheter assembly disclosed in Patent Document 1, when the catheter is inserted into the body, the housing is separated at an early stage, so that a long catheter or an inner needle is formed. It bends easily, causing the inconvenience of making it difficult to insert the catheter.

The present invention has been made to solve the above problems, and when the user inserts the catheter, the deflection of the catheter and the internal needle is suppressed as much as possible, and the catheter can be satisfactorily inserted into the blood vessel. It is an object of the present invention to provide a catheter assembly that can be operated.

In order to achieve the above object, the present invention comprises a catheter, a catheter hub that holds and holds the catheter, an internal needle that has a needle tip and is removably inserted into the catheter, and the internal needle. The catheter hub is fixedly held and accommodated so as to be displaced in the axial direction, and has a separable first part and a second part so as to allow the catheter hub to advance to the outside. And the housing that holds the catheter in cooperation with the first part and the second part in the closed state before the second part is separated, and until the catheter hub advances a predetermined distance to the housing. In the meantime, the first part and the second part are provided with a regulating mechanism part for restricting the separation of the first part and the second part, and the regulating mechanism part has a restraining member capable of restraining the first part and the second part. The restraining member maintains the regulation of separation by restraining both the first part and the second part, and accompanies the movement of the catheter operating member toward the tip of the first part and the second part. By releasing the restraint between the first part and the second part, the restriction on the separation is released.

According to the above, the catheter assembly has a regulating mechanism portion, which regulates the separation of the first part and the second part at the time of advancing the catheter until the catheter hub advances a predetermined distance with respect to the housing. .. Therefore, the catheter can be held well by the first and second parts in the closed state. Therefore, the user can suppress the bending of the catheter and the internal needle as much as possible in the advance operation of the catheter, and allow the catheter to enter the blood vessel well.

According to the present invention, the catheter assembly can suppress the deflection of the catheter and the internal needle as much as possible when the user inserts the catheter, so that the catheter can enter the blood vessel well.

It is a perspective view which shows the whole structure of the catheter assembly which concerns on 1st Embodiment of this invention. It is an exploded perspective view of the catheter assembly of FIG. It is a perspective view which shows the state which advanced the catheter and separated the housing in use of the catheter assembly of FIG. Following FIG. 3, it is a perspective view showing a state in which the catheter and the catheter hub are separated from the inner needle and the housing. 5A is a perspective view of the stopper member of FIG. 1, and FIG. 5B is a sectional view taken along line VB-VB of FIG. It is an enlarged perspective view which shows the closed state of the housing by the stopper member of FIG. It is an enlarged perspective view which shows the separated state of the housing by advancing the stopper member of FIG. It is a perspective view which shows the whole structure of the catheter assembly which concerns on 2nd Embodiment of this invention. 9A is a sectional view taken along line IXA-IXA of FIG. 8, and FIG. 9B is a partial plan view of the catheter assembly of FIG. It is an enlarged perspective view which shows the separated state of the housing by advancing the catheter operation member of FIG.

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

The catheter assembly according to the present invention is applied to construct a liquid introduction portion on the patient side when infusing or blood transfusion to the patient. In particular, the catheter assembly has the function of a venous catheter that is punctured and placed in a patient's vein. In addition, the catheter assembly may be configured as a catheter (eg, central venous catheter, PICC, midline catheter, etc.) that is longer than the peripheral venous catheter. The catheter assembly may be configured as a peripheral venous catheter. Alternatively, the catheter assembly is not limited to the intravenous catheter, and may be configured as an arterial catheter such as a peripheral arterial catheter.

[First Embodiment]
As shown in FIGS. 1 and 2, the catheter assembly 10 according to the first embodiment includes a catheter 12, a catheter hub 14, a catheter operating member 16, an inner needle 18, a guide wire 20, a guide wire operating member 22, and a housing 24. To be equipped. The catheter assembly 10 is configured in an initial state (product providing state) in which these members are assembled to construct a liquid introduction portion.

As shown in FIG. 1, the catheter assembly 10 forms a multi-tube structure (multi-tube portion 26) by stacking the catheter 12, the inner needle 18, and the guide wire 20 in this order from the outside in the initial state. The housing 24 houses a part of the multi-tube portion 26, a catheter hub 14, a catheter operating member 16, and a guide wire operating member 22 in an appropriately assembled state.

When using the catheter assembly 10, a user such as a doctor or a nurse grips the housing 24 and punctures the tip of the multi-tube portion 26 into the blood vessel of the patient. While maintaining this puncture state, the user advances the guide wire operating member 22 to expose the guide wire 20 from the inner needle 18. Further, the user advances the catheter operating member 16 relative to the housing 24 so that the catheter 12 advances toward the distal end side (the inner part of the blood vessel) with respect to the inner needle 18.

Then, as shown in FIG. 3, the housing 24 is separated into upper and lower parts with the relative advancement of the catheter 12 with respect to the housing 24 or the relative retreat of the housing 24 with respect to the catheter 12, and the catheter hub 14 and the catheter operating member 16 are separated. Can be taken out. Further, when the catheter 12 is advanced or the housing 24 is retracted, the catheter 12, the catheter hub 14, and the catheter operating member 16 are separated from the inner needle 18 as shown in FIG. After withdrawal, the catheter operating member 16 is removed from the catheter hub 14, and a connector of an infusion tube (not shown) is connected to the catheter hub 14 to construct a liquid introduction portion. Hereinafter, the catheter assembly 10 will be specifically described.

As shown in FIG. 2, the catheter 12 of the catheter assembly 10 is configured as a hollow tube having a lumen 12a. The inner cavity 12a is set to an inner diameter that can accommodate the inner needle 18. 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 catheter 12 may be configured to have appropriate flexibility and rigidity so that it can be smoothly inserted into the blood vessel. The constituent material of the catheter 12 is not particularly limited, but for example, a fluororesin such as polytetrafluoroethylene (PTFE), ethylene / tetrafluoroethylene copolymer (ETFE), perfluoroalkoxy alkane resin (PFA), polyethylene, polypropylene, etc. Such as olefin resin or a mixture thereof, polyurethane, polyester, polyamide, polyether nylon resin, mixture of olefin resin and ethylene / vinyl acetate copolymer and the like.

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 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 harder than the catheter 12 and is formed in a tubular shape that tapers toward the tip end. Inside the catheter hub 14, a hollow portion 14a is provided that communicates with the lumen 12a of the catheter 12 and allows infusion and blood to flow. The hollow portion 14a may accommodate a hemostatic valve, a plug, or the like (not shown) that prevents backflow of blood when the multi-tube portion 26 is punctured and enables liquid to be sent when the connector of the infusion tube is inserted.

The constituent material of the catheter hub 14 is also not particularly limited, and for example, a thermoplastic resin such as polypropylene, polycarbonate, polyamide, polysulfone, polyarylate, and methacrylate-butylene-styrene copolymer may be applied. A catheter operating member 16 (catheter operating unit) is connected to the proximal end side of the catheter hub 14 in an initial state.

The catheter operating member 16 is detachably attached to the proximal end portion of the catheter hub 14. The catheter operating member 16 has a ring-shaped base 28 and a pair of operating pieces 30 projecting radially outward from the base 28.

The base 28 has an outer diameter substantially matching the base end of the catheter hub 14, and a connecting means (not shown) is provided on the tip surface thereof. The connecting means is not particularly limited, but may include, for example, a protrusion that is inserted into the hollow portion 14a and fitted to the inner surface of the catheter hub 14.

Further, the pair of operation pieces 30 project in opposite directions at positions separated by 180 ° on the outer peripheral surface of the base portion 28. In the initial state, each operation piece 30 penetrates the side portion of the housing 24 and protrudes outward in the radial direction. By operating the operation piece 30, the user can move the catheter 12 and the catheter hub 14 forward and backward along the axial direction of the housing 24.

On the other hand, the inner needle 18 of the catheter assembly 10 is formed of a hollow tube having rigidity capable of puncturing the skin of a living body, and is arranged to penetrate through the cavity 12a of the catheter 12 and the hollow portion 14a of the catheter hub 14 in the initial state. Will be done. The inner needle 18 is firmly fixed to the housing 24 by an appropriate fixing method (fusion, adhesion, insert molding, etc.). A sharp needle tip 19 is provided at the tip of the inner needle 18, and the needle tip 19 is exposed from the catheter 12 in the initial state.

Examples of the constituent material of the inner needle 18 include stainless steel, aluminum or aluminum alloy, metal material such as titanium or titanium alloy, hard resin, ceramics and the like. A through hole 18a for slidably arranging the guide wire 20 is provided inside the inner needle 18. A notch groove (not shown) may be provided on the outer peripheral surface of the inner needle 18 along the axial direction.

The guide wire 20 is provided to facilitate the insertion of the catheter 12 into the blood vessel. The guide wire 20 is configured to have appropriate rigidity and flexibility, and its base end portion is fixed to the guide wire operating member 22. The guide wire 20 extends linearly from the fixed portion and is inserted from the proximal end side of the through hole 18a of the inner needle 18, and the tip end portion thereof is arranged on the proximal end side of the needle tip 19 in the initial state.

The guide wire operating member 22 (guide wire operating unit) advances and retreats the guide wire 20 under the operation of the user. The guide wire operating member 22 includes a holding block 32 that holds the guide wire 20 inside the housing 24, an extending portion 34 that extends from the holding block 32 toward the tip end and extends to the outside of the housing 24, and an extending portion 34. It has an operation plate portion 36 connected to the tip.

In the initial state, the holding block 32 is arranged at a position in contact with or close to the base end in the housing 24. The extending portion 34 once extends obliquely upward in the tip direction from the upper portion of the holding block 32, bends at a predetermined height position, and extends linearly in the tip direction of the housing 24. As a result, the guide wire operating member 22 is prevented from coming into contact with the catheter hub 14 and the stopper member 60 described later.

The operation plate portion 36 is formed in a flat plate shape and is exposed to the upper portion on the tip side outside the housing 24. A pair of side protrusions 36a projecting outward in the width direction are provided at the lower portions of both sides of the operation plate portion 36 in the width direction, and the side protrusions 36a are a pair of guide protrusions provided inside the housing 24. It is placed on the strip 53a (see FIG. 1). As a result, the operation plate portion 36 is guided to slide along the axial direction of the housing 24. The catheter assembly 10 may not include the guide wire 20 and the guide wire operating member 22. In this case, a solid needle may be applied to the inner needle 18.

The housing 24 of the catheter assembly 10 is formed in an elongated tubular shape as a whole, and has an internal space 24a for accommodating a part or all of the above-mentioned members. Further, while the housing 24 is integrally (unseparated) in the initial state, it is separated vertically during insertion of the catheter 12 into the blood vessel to allow the catheter hub 14 and the catheter operating member 16 to come off. .. Therefore, as shown in FIG. 2, the housing 24 is formed by assembling the lower housing 40 (first part), the upper housing 50 (second part), and the stopper member 60 (restraint member).

The lower housing 40 has a semicircular side cross section and a long boat shape in the longitudinal direction, and an inner portion thereof forms a substantially lower half of the internal space 24a. Specifically, the lower housing 40 has a lower wall 41 having a semicircular cross section and extending in the longitudinal direction, and a lower base end wall 42 that closes the internal space 24a at the base end. Further, on the tip end side of the lower housing 40, a neck portion 43 in which the lower wall 41 inclines diagonally upward toward the tip end and both widths gradually narrow inward, and a head portion 44 protruding from the neck portion 43 in the tip end direction. Is provided.

The inner surface forming the internal space 24a of the neck portion 43 is formed so as to be smoothly tapered toward the tip end direction. On both sides of the neck portion 43 in the width direction, side side portions 43a are formed so as to be smoothly connected to the outer peripheral surface of the lower wall 41 and project outward in the width direction to a predetermined thickness. This side side portion 43a is connected to the first protrusion 46 of the head 44.

On the other hand, the head 44 is formed in a thin prismatic shape in the vertical direction, and extends in the tip direction by a predetermined length. An arc-shaped lower concave groove 45 (first concave groove: see FIG. 5B) having a radius of curvature slightly larger than the outer diameter of the catheter 12 is provided on the upper surface of the head 44. The lower concave groove 45 is formed linearly from a position where the inside of the lower wall 41 is sufficiently thin on the tip end side of the lower housing 40 to the tip of the head 44.

On both sides of the head 44, a first protrusion 46, a first notch 47, a second protrusion 48, and a second notch 49, which are part of the regulation mechanism 38 (see FIG. 1), are based on the head 44. It is provided in order from the end side to the tip side. Each portion is formed symmetrically with respect to each other with the axial center of the housing 24 interposed therebetween.

The first protrusion 46 slightly protrudes outward in the width direction on the base end side of the head 44, and is connected to the side side portion 43a. The second protrusion 48 protrudes independently by being sandwiched between the first and second notches 47 and 49 that are recessed inward in the width direction. The amount of protrusion of the first protrusion 46 and the second protrusion 48 is about the same. The first and second protrusions 46 and 48 form a portion where the engaging claw 66 of the stopper member 60, which will be described later, is hooked, and the first and second notched portions 47 and 49 do not catch the engaging claw 66 ( It constitutes the part (to come out).

Further, in the lower housing 40, the upper portions on both sides in the width direction of the lower wall 41 are formed lower than the upper portion on the proximal end side of the lower wall 41 from the intermediate portion in the axial direction to the tip end side. Therefore, in the initial state shown in FIG. 1, a pair of slits 24b through which the operation piece 30 of the catheter operating member 16 penetrates is formed on the side portion of the housing 24.

Further, as shown in FIG. 2, a block-shaped needle holding portion 41a is provided at a position slightly closer to the base end than the axial intermediate portion of the lower wall 41. The needle holding portion 41a projects upward from the inner surface of the lower wall 41, and the base end portion of the inner needle 18 is fixedly held at the upper portion thereof. The base end surface of the needle holding portion 41a is provided with an opening (not shown) that can communicate with the through hole 18a of the inner needle 18.

The upper housing 50 is formed so as to match the axial length of the lower housing 40, and initially forms a cylindrical appearance together with the lower housing 40. The upper housing 50 has a tip structure 51 facing the neck 43 and the head 44 of the lower housing 40, and an accommodating portion connected to the tip structure 51 and facing the base end side of the lower housing 40 with respect to the neck 43. It is composed of 52.

In the initial state, the tip structure portion 51 has a function of forming a closed state with the lower housing 40 by the stopper member 60 and sandwiching the multiple pipe portion 26 with the head 44. The tip structure portion 51 includes a pair of arm portions 53 on which the guide wire operating member 22 is slidably placed, and a guide portion 54 extending inside the pair of arm portions 53 along the axial direction.

The pair of arm portions 53 are connected to both side portions of the accommodating portion 52 on the base end side, and extend toward the tip end while maintaining the same width as each other. Inside the pair of arm portions 53, guide ridge portions 53a that support the operation plate portion 36 of the guide wire operation member 22 are projected. The guide ridge portion 53a extends linearly along the axial direction of the arm portion 53 at a position above the guide portion 54.

The guide portion 54 is a portion that slidably supports the stopper member 60 in the upper housing 50, and constitutes a part of the regulation mechanism portion 38. The guide portion 54 has a tip from a portion where the pair of curved support portions 55 extending diagonally inward from the inner surface of the tip wall 52a of the accommodating portion 52 and the base end portions of the pair of arm portions 53 and the pair of curved support portions 55 merge. Includes a linear support 56 extending in the direction.

Inside the pair of curved support portions 55 and the tip wall 52a of the accommodating portion 52, a cavity having a triangular shape in a plan view and long in the axial direction is formed, and an extrusion protrusion 64 of the stopper member 60 (in this cavity). (See FIG. 5A) is inserted. On the other hand, the straight support portion 56 is formed in a block shape wide in the width direction and thin in the vertical direction, and faces the head 44 of the lower housing 40. An arc-shaped upper concave groove 57 (first concave groove) having a radius of curvature slightly larger than the outer diameter of the catheter 12 is provided on the lower surface of the straight support portion 56. The upper concave groove 57 is formed so as to linearly extend the entire lower surface of the linear support portion 56 along the axial direction. Further, a detachment prevention protrusion 56a (disengagement prevention portion) for restricting the removal of the stopper member 60 from the guide portion 54 is formed at the tip end portion of the straight support portion 56.

Similar to the lower wall 41 of the lower housing 40, the accommodating portion 52 has an upper wall 58 having a semicircular cross section and extending in the axial direction, and an upper base end wall 59 that closes the internal space 24a on the base end side. Further, the tip end side of the accommodating portion 52 has a tip wall 52a that partially closes the internal space 24a, and the tip wall 52a has an insertion hole 52b through which the extending portion 34 of the guide wire operating member 22 is passed. It is provided.

In the lower housing 40 and the upper housing 50, the housings 24 are moved up and down with the hinge means 39 as a base point by connecting the respective base end walls (lower base end wall 42 and upper base end wall 59) by the hinge means 39. It is separable. The hinge means 39 is not particularly limited, and for example, the lower housing 40 and the upper housing 50 may be connected by a hinge structure so that the upper end of the lower base end wall 42 and the lower end of the upper base end wall 59 are connected to each other. The lower housing 40 and the upper housing 50 may be integrally molded.

In the initial state, the stopper member 60 is arranged at the initial position (base end position) of the guide portion 54 of the upper housing 50 to close the head 44 of the lower housing 40 and the linear support portion 56 of the upper housing 50. Therefore, it constitutes a part of the regulation mechanism unit 38 that regulates the separation of the housing 24. The stopper member 60 is pushed out toward the tip end as the catheter hub 14 advances and moves to the release position (tip position), thereby allowing the head 44 and the linear support portion 56 to be separated. Therefore, as shown in FIG. 5A, the stopper member 60 includes an upper plate 61 which is placed on the guide portion 54 in the mounted state, and a hold portion 62 which projects downward from the upper plate 61 and holds the head 44 together with the guide portion 54. Has. That is, the stopper member 60 is formed in a concave shape in a front view (see also FIG. 5B), and a hold space 63 communicating with the lower gap 63a is provided inside the stopper member 60.

The upper plate 61 is formed in a rectangular shape that is long in the axial direction and short in the width direction of the straight support portion 56. The lower surface of the upper plate 61 is formed smoothly and is placed on the upper surface of the guide portion 54. Extrusion protrusions 64 are formed so as to protrude downward at the base end portion of the upper plate 61. The extrusion protrusion 64 is arranged so as to face the tip of the catheter hub 14, so that the tip of the catheter hub 14 comes into contact with the tip of the catheter hub 14 and is pushed out as the catheter 12 advances. Further, at the lower end of the extrusion protrusion 64, an insertion recess 64a in which the catheter 12 is inserted in the initial state and opens downward is provided.

The hold portion 62 has a pair of side plates 65 projecting downward from both side portions in the width direction of the upper plate 61, and a pair of engaging claws 66 projecting inward in the width direction from the lower ends of the pair of side plates 65. It surrounds the hold space 63 together with 61. As shown in FIG. 5B, the pair of side plates 65 are separated from each other by a width corresponding to the width of the linear support portion 56, and project with a length corresponding to the thickness of the linear support portion 56 and the head 44.

As shown in FIG. 5A, the pair of engaging claws 66 is composed of a first convex portion 67 provided on the base end side of the side plate 65 and a second convex portion 68 provided on the tip end portion of the side plate 65. , They are formed symmetrically with each other across the gap 63a. The first convex portion 67 has a shape capable of passing through the first notch portion 47 of the lower housing 40, and the second convex portion 68 has a shape capable of passing through the second notch portion 49. It has become. Further, the concave portion 69 existing between the first convex portion 67 and the second convex portion 68 has a shape in which the second protruding portion 48 of the lower housing 40 comes out.

As described above, the regulation mechanism portion 38 of the catheter assembly 10 is composed of the head 44 of the lower housing 40 (including the tip of the neck portion 43), the guide portion 54 of the upper housing 50, and the stopper member 60. When assembling the regulation mechanism portion 38, the stopper member 60 is first attached to the guide portion 54 of the upper housing 50. At the time of mounting, since there is a margin in the hold space 63 of the stopper member 60, interference between the detachment prevention protrusion 56a of the guide portion 54 and the extrusion protrusion 64 of the stopper member 60 is suppressed, and the stopper member 60 can be easily mounted. Then, the extrusion protrusion 64 is arranged in the hollow portion of the guide portion 54, the stopper member 60 supported by the guide portion 54 is positioned at the release position, and the head of the lower housing 40 is passed through the lower gap 63a. The 44 is put into the hold space 63 and overlapped with the guide portion 54 of the upper housing 50.

Further, by retracting the stopper member 60 and arranging it in the initial position, as shown in FIGS. 5B and 6, the head 44 (or neck 43) of the lower housing 40 and the guide portion of the upper housing 50 in the hold space 63. A closed state is formed in which the 54s are not separated from each other. In this closed state, the first convex portion 67 hooks the first protrusion 46 (or including the side side portion 43a) of the lower housing 40, and the second convex portion 68 hooks the second protrusion 48, whereby the upper portion is upper. The separation of the lower housing 40 from the housing 50 is regulated. Then, in the closed state, the tip portion of the housing 24 forms a hole that slidably sandwiches the multi-tube portion 26 (catheter 12) by the lower concave groove 45 and the upper concave groove 57. As a result, the tip end side of the housing 24 can hold the multi-tube portion 26 over a predetermined range in the axial direction.

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

In the use of the catheter assembly 10, the user grips the housing 24 to puncture the patient with the multi-tube section 26. In the catheter assembly 10, in the initial state shown in FIG. 6, the stopper member 60 arranged at the initial position holds the lower housing 40 (head 44) and the upper housing 50 (guide portion 54) in a closed state.

Therefore, the lower housing 40 and the upper housing 50 are in a state in which the multi-tube portion 26 is appropriately held, and even if the multi-tube portion 26 receives a reaction force due to puncture, the housing 24 is prevented from bending. That is, the multi-tube portion 26 is maintained in a well-extended state from the tip of the housing 24, and the user can puncture the multi-tube portion 26 without discomfort to the patient. Further, with such a configuration, the catheter assembly 10 can be formed thinner by weakening the strength of the inner needle 18, and the burden on the patient can be reduced.

In the punctured state of the multi-tube portion 26, the user advances the operation plate portion 36 of the guide wire operating member 22 and sends the guide wire 20 from the needle tip 19 of the inner needle 18 to advance into the blood vessel. Since the extending portion 34 of the guide wire operating member 22 is not in contact with the catheter hub 14 or the like, the operating force of the user is easily transmitted to the guide wire 20 so that the guide wire 20 can be smoothly advanced. Can be done.

After that, the user advances the catheter 12 relative to the inner needle 18 and inserts the catheter 12 into the blood vessel. At this time, the user puts a finger on the pair of operating pieces 30 of the catheter operating member 16 and slides the operating piece 30 in the distal direction relative to the housing 24. As a result, the catheter 12 and the catheter hub 14 also advance integrally, and the catheter 12 is well guided into the blood vessel along the preceding guide wire 20.

The regulation mechanism portion 38 of the housing 24 regulates the separation of the lower housing 40 and the upper housing 50 for a certain period of time even while the catheter 12 is advancing. Therefore, even if the catheter 12 receives a reaction force from the patient's skin or the like as it advances, the lower housing 40 and the upper housing 50 that support the periphery of the catheter 12 suppress the bending. Therefore, for example, the needle tip 19 of the inner needle 18 does not recede due to bending and does not come out of the skin, and inconveniences such as puncturing the inner needle 18 again into the skin are avoided.

Then, when the catheter operating member 16 is advanced, the tip of the catheter hub 14 comes into contact with the extrusion protrusion 64 of the stopper member 60, thereby pushing the stopper member 60 toward the tip. The stopper member 60 moves toward the tip end along the head 44 of the lower housing 40 and the guide portion 54 of the upper housing 50. After that, when it is arranged at the release position, as shown in FIG. 7, the engaging claws 66 (first and second convex portions 67, 68) of the stopper member 60 and the first and second notches of the lower housing 40 are notched. The portions 47 and 49 overlap each other, and the lower housing 40 can come out of the gap 63a of the stopper member 60. That is, the restriction on separation is lifted, and the housing 24 is separated from the tip by operating the upper housing 50 so as to be separated from the lower housing 40.

At this time, the catheter 12, the catheter hub 14, and the catheter operating member 16 also approach the lower housing 40 side from the upper housing 50 and the stopper member 60 via the gap 63a of the stopper member 60. In particular, since the catheter 12 is not held in the insertion recess 64a of the extrusion protrusion 64, it smoothly follows the lower housing 40 side. Therefore, the catheter 12, the catheter hub 14, and the catheter operating member 16 can be taken out from between the separated lower housing 40 and the upper housing 50 in the distal direction. On the other hand, the stopper member 60 is prevented from coming off from the housing 24 by the tip surface of the stopper member 60 coming into contact with the detachment prevention projection 56a of the guide portion 54 (or the extrusion projection 64 coming into contact with the base end portion of the linear support portion 56). Will be done.

After the catheter operating member 16 is removed from the housing 24, the inner needle 18 is pulled out from the catheter operating member 16 to separate the inner needle 18 and the housing 24 from the catheter 12 and the catheter hub 14. The user then detaches the catheter operating member 16 from the catheter hub 14. This allows the catheter 12 and the catheter hub 14 to be well placed in the patient. On the other hand, the inner needle 18 and the housing 24 are discarded after use. In order to prevent accidental puncture of the inner needle 18 after use, it is preferable that the catheter assembly 10 has a protector that covers the needle tip 19 of the inner needle 18 after the catheter 12 and the catheter hub 14 are detached. For example, the catheter operating member 16 may serve as a protector.

As described above, the catheter assembly 10 according to the first embodiment has the regulatory mechanism portion 38, so that when the catheter 12 is advanced, the lower portion of the catheter assembly 10 until the catheter hub 14 advances a predetermined distance with respect to the housing 24. The separation of the housing 40 and the upper housing 50 is regulated. Therefore, the catheter 12 can be well held by the closed lower housing 40 and the upper housing 50. Therefore, the user can suppress the deflection of the catheter 12 and the inner needle 18 as much as possible in the advance operation of the catheter 12, and allow the catheter 12 to enter the blood vessel well.

In this case, the regulation mechanism portion 38 can be more reliably maintained in the closed state by the stopper member 60 having the hold portion 62. Further, when the catheter hub 14 pushes out the stopper member 60, the lower housing 40 and the upper housing 50 can be easily separated, and the catheter 12 and the catheter hub 14 can be easily taken out from the housing 24. Further, the catheter assembly 10 is easy to handle because the stopper member 60 is not accidentally dropped by preventing the stopper member 60 from being detached by the detachment prevention protrusion 56a. Further, since the stopper member 60 and the guide wire operating member 22 are provided in non-contact with each other, the user does not move the stopper member 60 when the guide wire operating member 22 advances or retreats the guide wire 20, and the housing 24 Separation can be prevented.

The catheter assembly 10 according to the present invention is not limited to the above embodiment, and various modifications can be taken. For example, the stopper member 60 may be provided not only in the upper housing 50 but also in a configuration in which a guide portion 54 is formed in the lower housing 40, the stopper member 60 is attached to the guide portion 54, and the upper housing 50 is held. Further, the shapes of the engaging claw 66 (hold portion 62) of the stopper member 60 and the head 44 of the lower housing 40 are not particularly limited, and various shapes capable of switching between mutual engagement and disengagement can be obtained. Can be adopted. Further, the housing 24 (lower housing 40 and upper housing 50) may be partially exposed without completely covering the catheter 12 and the catheter hub 14. Furthermore, the housing 24 may have various structures in which not only the upper and lower halves are separated, but also a part (first part) of the housing 24 is separated from the other part (second part).

[Second Embodiment]
Next, the catheter assembly 10A according to the second embodiment will be described with reference to FIGS. 8 to 10. In the following description, the same configurations as those of the catheter assembly 10 according to the first embodiment or the configurations having the same functions are designated by the same reference numerals, and detailed description thereof will be omitted. The catheter assembly 10A according to the second embodiment does not include the stopper member 60, and the catheter operating member 70 (restraint member) regulates the separation of the lower housing 80 and the upper housing 90 of the housing 24A in the initial state. It is different from the catheter assembly 10.

Specifically, as shown in FIGS. 9A and 9B, the lower housing 80 has a pair of lower rail portions 82 (first rail portions) at the upper portions on both sides in the width direction of the lower wall 81. The pair of lower rail portions 82 project shortly inward in the width direction and extend from the axial intermediate portion of the lower housing 80 to the front of the neck portion 83. Further, the head 84 of the lower housing 80 does not include the first and second protrusions 46 and 48 and the first and second notches 47 and 49 as in the first embodiment, and both side surfaces thereof are parallel to each other. It is extending. A pair of engaging protrusions 86 that project upward and extend in the axial direction are provided on both sides of the upper surface of the head portion 84 in the width direction.

On the other hand, the upper housing 90 has a pair of upper rail portions 92 (second rail portions) at the lower portions on both sides in the width direction of the upper wall 91. Like the lower rail portion 82, the pair of upper rail portions 92 project shortly inward in the width direction and extend from the axial intermediate portion of the upper housing 90 to the front of the tip structure portion 93. Further, the tip structure portion 93 includes a pair of arm portions 94, a rib 95 projecting inward from the inner side surface of the pair of arm portions 94 to guide the guide wire operating member 22, and the pair of arm portions 94 connected to the rib 95. It is provided with a connecting plate portion 96 for connecting the above. On the lower surface of the connecting plate portion 96, a pair of engaging recesses 97 into which a pair of engaging protrusions 86 of the lower housing 80 can be inserted are provided.

The lower housing 80 and the upper housing 90 form a slit 24b between the lower rail portion 82 and the upper rail portion 92 in the initial state (closed state). The operation piece 72 of the catheter operating member 70 is passed through the slit 24b. Further, in the closed state, the head 84 of the lower housing 80 and the connecting plate portion 96 of the upper housing 90 are in close contact with each other, and the catheter 12 (multiplexed) is formed in the hole formed by the lower concave groove 45 and the upper concave groove 57. The pipe portion 26) is housed.

On the other hand, the catheter operating member 70 includes a pair of engaging portions 73 that slidably hook the lower rail portion 82 and the upper rail portion 92 at a portion where the base portion 71 and the pair of operating pieces 72 are connected. The pair of engaging portions 73 are formed to bulge in opposite directions on the outer peripheral surface of the base portion 71. The engaging portion 73 has a lower hook 74 (first hook portion) protruding from the lower side of the bulging end portion and an upper hook 75 (second hook portion) protruding from the upper side of the bulging end portion. A rod-shaped operation piece 72 is provided in the middle portion in the vertical direction.

The lower hook 74 and the upper hook 75 project outward to the same extent in the width direction and are separated from the operation piece 72 by the same distance. The lower hook 74 is slidably hooked on the lower rail portion 82 by sandwiching the lower rail portion 82 in cooperation with the operation piece 72. The upper hook 75 is slidably hooked on the upper rail portion 92 by sandwiching the upper rail portion 92 in cooperation with the operation piece 72.

That is, the engaging portion 73 of the catheter operating member 70 closes the lower housing 80 and the upper housing 90 within the forming range of the lower rail portion 82 and the upper rail portion 92, and regulates their separation from each other. Then, the catheter operating member 70 advances, the lower hook 74 is disengaged from the lower rail portion 82, and the upper hook 75 is disengaged from the upper rail portion 92, thereby releasing the restriction on the separation of the lower housing 80 and the upper housing 90. ..

The catheter assembly 10A has a configuration in which the lower hook 74 and the upper hook 75 are simultaneously disengaged, that is, the lower hook 74 and the upper hook 75 are provided at the same axial positions, and the lower rail portion 82 and the upper rail portion 92 are provided. It is preferable that the axial tips of the above are the same. As a result, when the catheter operating member 70 advances, the lower housing 80 and the upper housing 90 are separated at the same time. Therefore, after separation, the catheter 12, the catheter hub 14, and the catheter operating member 70 are prevented from unilaterally approaching the lower housing 80 or the upper housing 90, and the catheter 12 and the catheter hub 14 can be satisfactorily detached from the housing 24A. ..

The catheter assembly 10A according to the second embodiment is basically configured as described above. In the initial state, the catheter assembly 10A is configured in a closed state in which the separation of the lower housing 80 and the upper housing 90 is restricted by the regulation mechanism portion 38A (engagement portion 73, lower rail portion 82, upper rail portion 92). doing. That is, by sandwiching the catheter 12 between the head 84 and the connecting plate portion 96 of the upper housing 90, it is possible to suppress the bending of the catheter 12 at the time of puncture.

Further, when the catheter 12 is advanced, the engaging portion 73 (lower hook 74 and upper hook 75) of the catheter operating member 70 slides along the lower and upper rail portions 82 and 92, and the lower part also slides during this sliding. It regulates the separation of the housing 80 and the upper housing 90. As a result, the deflection of the catheter 12 can be suppressed until the catheter 12 is sufficiently inserted into the blood vessel, and the user's operation can be simplified.

As shown in FIG. 10, when the catheter operating member 70 advances and the engaging portion 73 disengages from the lower and upper rail portions 82 and 92, the restriction on the separation of the lower housing 80 and the upper housing 90 is lifted and the housing 24A can be separated from the tip side. This allows the user to easily remove the catheter 12, the catheter hub 14, and the catheter operating member 70 from between the separated lower housing 80 and upper housing 90.

As described above, the catheter assembly 10A according to the second embodiment can also obtain the same effect as the catheter assembly 10. Further, in the catheter assembly 10A, the engaging portion 73 of the catheter operating member 70 engages the lower housing 80 and the upper housing 90 together, so that the housing 24A is closed and released from the closed state without increasing the number of members. Can be easily switched. Further, the engaging portion 73 has the lower hook 74 and the upper hook 75, and the housing 24A has the lower rail portion 82 and the upper rail portion 92, thereby reliably restricting the separation of the lower housing 80 and the upper housing 90. be able to. Then, when the catheter 12 is inserted, the engaging portion 73 can be smoothly moved along the lower and upper rail portions 82 and 92.

The catheter assembly 10A according to the second embodiment is not limited to the above configuration, and various modifications and applications can be taken. For example, the engaging portion 73 may be provided not only on the catheter operating member 70 but also on the catheter hub 14. In this case, the engaging portion 73 may be disengaged from the catheter hub 14 or may be indwelled together when the catheter hub 14 is indwelled.

It goes without saying that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.

Claims (5)

With a catheter
A catheter hub that holds the catheter in place and
An inner needle that has a needle tip and is removably inserted into the catheter.
The catheter hub is fixedly held and held, and the catheter hub is displaced in the axial direction, and has a separable first part and a second part so as to allow the catheter hub to advance to the outside. A housing that holds the catheter in cooperation with the first part and the second part in a closed state before the first part and the second part are separated.
A regulatory mechanism that regulates the separation of the first part and the second part is provided until the catheter hub advances a predetermined distance to the housing.
The regulatory mechanism portion has a restraining member capable of restraining the first portion and the second portion.
The restraining member maintains the regulation of separation by restraining both the first part and the second part, and accompanies the movement of the catheter operating member toward the tip of the first part and the second part. A catheter assembly characterized in that the restriction on separation is released by releasing the restraint between the first part and the second part. In the catheter assembly according to claim 1,
A catheter assembly characterized in that the restraining member is slidably provided on the distal end side of the first portion and the second portion. In the catheter assembly according to claim 2,
The second portion has a guide portion extending along the axial direction and provided with the restraining member.
The restraint member has a hold portion that holds the first portion in a state before the catheter hub is advanced.
The hold portion allows the first portion to be detached based on the fact that the restraining member is pushed toward the tip end by the catheter hub and moves to the release position.

A catheter assembly characterized by that. In the catheter assembly according to claim 3,
A catheter assembly characterized in that the regulating mechanism portion has a detachment prevention portion for preventing the restraint member from detaching from the guide portion. In the catheter assembly according to any one of claims 1 to 4.
The catheter assembly
A guide wire that can be delivered from the needle tip through the inside of the inner needle,
It has a guide wire operation unit for operating the delivery of the guide wire, and has.
A catheter assembly characterized in that the restraining member and the guide wire operating portion are provided in non-contact with each other.

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