JP5645223B2 - Catheter kit, guide wire and catheter - Google Patents

Description

The present invention relates to a catheter kit, a guide wire, and a catheter.

Conventionally, interventional radiology (hereinafter also referred to as IVR treatment) is known as a treatment method for treating diseases of organs such as the brain, heart, liver or abdomen and luminal diseases such as blood vessels.

In the IVR treatment, a catheter kit is used which is a combination of a catheter having a lumen formed therein and a guide wire inserted into the lumen of the catheter.

In IVR treatment using a catheter kit, after observing radioscopy images and ultrasound images, the catheter kit inserted percutaneously into the blood vessel is introduced to the lesion of an organ such as the brain, heart, liver, or abdomen. The lesion is treated by administering a therapeutic agent, an embolic substance, a contrast medium, etc., or sucking a thrombus.

  To explain the IVR treatment procedure in more detail, the operator first advances the guide wire inserted percutaneously into the blood vessel to the vicinity of the lesion, and then inserts the guide wire into the lumen of the catheter and near the lesion. Advance the catheter until

Next, in order to reliably administer a therapeutic agent or the like via the lumen of the catheter, an operation of positioning the distal portion of the catheter at a target lesion is performed.
In this operation, for example, while holding and fixing the catheter with the left hand, the operator pushes the guide wire with the right hand while selecting a desired blood vessel one after another to bring the guide wire closer to the lesion. After the guide wire is pushed to some extent, the catheter is pushed along the guide wire with the left hand while holding and fixing the guide wire with the right hand.
That is, the operator positions the distal portion of the catheter at the target lesion by repeating the operation of alternately pushing the catheter and the guide wire using both hands, like the operation of the scale insect.

  However, in the procedure method using such a conventional catheter kit, both hands of the operator are blocked, the degree of freedom of work is low, and the distal portion of the catheter is accurately positioned at the target lesion. However, there is a problem that high technology is required.

  As a catheter kit for solving such a problem, Patent Document 1 discloses a catheter kit including a guide wire and a catheter through which the guide wire passes through the lumen. -An expandable segment made of a ring or the like is formed, and when the expandable segment is in an expanded state, the expandable segment and a part of the lumen of the catheter come into contact with each other and the catheter kit moves integrally in the blood vessel. A catheter kit is disclosed which is configured to be able to do so.

JP 2007-175497 A

  The catheter kit described in Patent Document 1 has the following problems.

1. When a balloon is used as the expandable segment, it is necessary to form a lumen, mechanism, etc. for distributing the expansion liquid for expanding and contracting the balloon inside the guide wire, and the structure of the guide wire is complicated. It will become.

2. As a result of the complicated structure of the guide wire, the flexibility of the guide wire is reduced, and it is difficult to reduce the diameter of the guide wire or the like for the purpose of treating a lesion in a smaller diameter blood vessel. There is.

3. If an elastomeric O-ring is employed as the expandable segment, a handle for actively expanding the O-ring to contact a portion of the lumen of the catheter must be formed at the proximal end; Again, the structure of the guide wire becomes complicated, and the above-mentioned 1. There are similar problems.

4). The catheter kit moves integrally within the blood vessel with the expandable segment formed on the guide wire in contact with a portion of the lumen of the catheter. In order to achieve this integral movement, the frictional resistance that occurs when the expandable segment and a portion of the lumen of the catheter come into contact is utilized. Is added to the guide wire, the contact between the expandable segment and a portion of the lumen of the catheter is released relatively easily and can no longer be moved together.
In particular, this tendency is conspicuous in complicated deep blood vessels and the like, and it becomes difficult to move integrally, and the operator may be prevented from freely operating the catheter kit.

Problem 1. ~ 4. The catheter kit according to the present invention capable of solving
A catheter having a proximal portion and a distal portion, and having a lumen communicating from a proximal opening that opens to the proximal portion to a distal opening that opens to the distal portion;
A catheter kit having a distal end portion and a rear end portion, and a guide wire formed so that the distal end portion is inserted from the proximal opening portion and can be inserted into the lumen to the distal opening portion. Because
A diameter-expanded portion is formed on the outer surface of the tip portion,
The inner surface of the lumen in the distal portion has a distal protrusion protruding in the direction of the central axis of the lumen, and protrudes in the direction of the central axis of the lumen, than the distal protrusion. A proximal protrusion located on the proximal portion side, and an accommodating portion formed between the distal protrusion and the proximal protrusion, are formed,
When inserting the pre-Symbol guidewire into the lumen, the said enlarged portion and can be accommodated in the accommodation portion, when removed the guidewire from the lumen, the said enlarged diameter portion It is possible to move from the accommodating portion to the proximal projecting portion .

  In the catheter kit of the present invention, it is preferable that the protruding length of the distal protruding portion is larger than the protruding length of the proximal protruding portion.

In the catheter kit of the present invention, it is preferable that at least one of the enlarged diameter portion and the proximal protrusion is formed of a deformable elastic material.

In the catheter kit of the present invention, it is preferable that at least one of the distal protrusion and the accommodating portion is formed of a low friction material.
In the present specification, the low friction material means a material having a low frictional resistance in a dry state where the catheter kit is outside the body and is not in contact with a body fluid such as blood, and the catheter kit is in a lumen such as a blood vessel. A material with low frictional resistance in the state of being inserted and in contact with a body fluid, specifically, a metal material such as stainless steel or Ni-Ti alloy, a hydrophilic material such as hyaluronic acid, a polyurethane resin, a low density It refers to at least one material selected from the group consisting of polyethylene, polypropylene such as polyethylene, high-density polyethylene or linear low-density polyethylene, and fluorine-based resins such as PTFE (polytetrafluoroethylene). Specific examples of the hydrophilic material that can be adopted will be described later.

  In the catheter kit of the present invention, it is desirable that the elastic material includes an elastomer, and the low friction material includes a fluorine resin, a polyurethane resin, or a hydrophilic material.

  In the catheter kit of the present invention, it is desirable that the enlarged diameter portion is formed by a ring-shaped protrusion formed on the outer surface of the distal end portion.

  In the catheter kit of the present invention, it is desirable that the distal end portion is shaped in a certain direction.

  The guide wire according to the present invention is a guide wire used in any one of the catheter kits of the present invention.

  The catheter according to the present invention is a catheter used in any one of the above-described catheter kits of the present invention.

In the catheter kit which concerns on this invention, it is a general view which shows a mode that the enlarged diameter part was accommodated in the accommodating part. In the catheter kit which concerns on this invention, it is a general view which shows a mode that the enlarged diameter part was open | released from the accommodating part. 3 (a) and 3 (b) are explanatory views showing a state in which a branch blood vessel is selected using a catheter kit in which the enlarged diameter portion shown in FIG. 1 is accommodated in the accommodating portion. It is a modification of the catheter kit which concerns on this invention.

The catheter kit of this embodiment will be described with reference to FIGS. 1 and 2.
1 and 2, the distal portion side of the catheter and the distal end portion side of the guide wire are portions inserted into the body, and the proximal portion side of the catheter and the rear end portion side of the guide wire are technicians such as doctors. It is the part operated by. In FIG.1 and FIG.2, since the catheter and the guide wire are elongate, the intermediate part is abbreviate | omitted and shown. For the sake of convenience, the tip end portion of the guide wire and the tip end portion of the core shaft are indicated by the same reference numerals, and the rear end portion of the guide wire and the rear end portion of the core shaft are indicated by the same reference numerals.

  The catheter kit 1 shown in FIGS. 1 and 2 has a proximal portion 11 and a distal portion 12, and a distal opening opened from the proximal opening 11 a opened to the proximal portion 11 to the distal portion 12. A catheter 10 having a lumen 13 communicating with the portion 12a, a distal end portion 21 and a rear end portion 22, and the distal end portion 21 is inserted from the proximal opening portion 11a to the distal opening portion 12a. The guide wire 20 is formed so as to be inserted through the cavity 13.

  An enlarged diameter portion 21 b is formed on the outer surface 21 a of the distal end portion 21 of the guide wire 20.

  The inner surface 13a of the lumen 13 in the distal portion 12 has a distal protrusion 13b protruding in the direction of the central axis of the lumen 13, and a distal protrusion 13b protruding in the direction of the central axis of the lumen 13. The proximal side protrusion part 13c located in the proximal part 11 side rather than and the accommodating part 13d formed between the distal side protrusion part 13b and the proximal side protrusion part 13c are formed.

  The distal projecting portion 13b, the proximal projecting portion 13c, and the accommodating portion 13d are formed such that the enlarged diameter portion 21b is accommodated in the accommodating portion 13d when the guide wire 20 is inserted into the lumen 13. And when the guide wire 20 is extracted from the inside of the lumen 13, the enlarged diameter portion 21b is formed to be opened from the accommodating portion 13d.

  The distal projecting portion 13b, the proximal projecting portion 13c, and the accommodating portion 13d are formed such that the enlarged diameter portion 21b is accommodated in the accommodating portion 13d when the guide wire 20 is inserted into the lumen 13. Therefore, when the operator grasps the rear end portion 22 of the guide wire 20 and pushes in the guide wire 20, the enlarged-diameter portion 21b of the guide wire 20 accommodated in the accommodating portion 13d is shown in FIG. And the distal protruding portion 13b of the accommodating portion 13d come into contact with each other, whereby the catheter 10 is integrally pushed in accordance with the movement of the guide wire 20.

  On the other hand, when the operator pulls the guide wire 20 with a relatively weak force from the state where the enlarged diameter portion 21b is once accommodated in the accommodating portion 13d, the enlarged diameter portion 21b of the accommodated guide wire 20 and the accommodating portion are accommodated. The catheter 10 is pulled by following the movement of the guide wire 20 by coming into contact with the proximal protrusion 13c of 13d.

  Further, the distal protrusion 13b, the proximal protrusion 13c, and the accommodating part 13d are formed such that the enlarged diameter part 21b is opened from the accommodating part 13d when the guide wire 20 is removed from the inner cavity 13. Therefore, when the operator pulls (extracts) the guide wire 20 with a relatively large force, as shown in FIG. 2, the enlarged diameter portion 21b of the accommodated guide wire 20 is removed from the accommodating portion 13d. Once open, the guidewire 20 can be removed from the lumen 13 of the catheter 10.

In other words, the operator can operate the catheter kit 1 integrally with one hand without using both hands like a worm as in the prior art, and the degree of freedom of work is high, and the distal portion of the catheter 10 can be operated. 12 can be accurately positioned at the lesion.
In addition, a complicated structure necessary for expansion and contraction operations, such as a balloon and an O-ring, is not required, and the guide wire 20 can be reduced in diameter to be suitable for a lesion of a smaller diameter blood vessel.
Furthermore, even when the pushing operation and the pulling operation of the guide wire 20 are performed, the enlarged diameter portion 21b is accommodated in the accommodating portion 13d, so that the guide wire 20 and the catheter 10 can be easily operated integrally, and the subsequent extraction is performed. By the operation, the guide wire 20 can be easily removed from the lumen 13 of the catheter 10.

  Hereinafter, a more specific configuration of the catheter kit according to the present embodiment will be described.

As shown in FIG. 2, the protrusion length L of the distal protrusion 13b is larger than the protrusion length l of the proximal protrusion 13c.
Therefore, at the time of pushing operation, the enlarged diameter portion 21b accommodated in the accommodating portion 13d and the distal protrusion 13b of the accommodating portion 13d are more likely to come into contact with each other, and the catheter kit 1 can be easily pushed together. .
On the other hand, at the time of the extraction operation, the enlarged diameter portion 21b is not easily caught by the proximal protruding portion 13c of the accommodating portion 13d, and is easily released from the accommodating portion 13d, so that the guide wire 20 can be easily extracted.

  The protrusion length L of the distal protrusion 13b is desirably 0.1 to 0.6 mm, and the protrusion length l of the proximal protrusion 13c is desirably 0.05 to 0.5 mm. The length of the accommodating portion 13d is desirably 1 to 50 mm.

At least one of the distal protrusion 13b and the accommodating portion 13d is formed of a low friction material. Therefore, the distal end portion 21 of the guide wire 20 inserted into the lumen 13 of the catheter 10 can be easily rotated with the catheter 10 fixed. Accordingly, as shown in FIG. 3A, when selecting a branch blood vessel Y branched from the main tube X, for example, the distal end portion 21 of the guide wire 20 protrudes forward from the distal opening 12a of the catheter 10. In this state, the distal end portion 21 of the guide wire 20 can be rotated to easily select a desired branch blood vessel Y.
Then, as shown in FIG. 3B, the catheter 10 can be smoothly advanced to the branch blood vessel Y by following the guide wire 20.
In particular, even when the catheter kit 1 is led to the vicinity of a deep lesion, the distal end portion 21 of the guide wire 20 can be easily rotated, and a small-sized blood vessel can be more easily selected.
Both the distal protrusion 13b and the accommodating portion 13d are preferably formed of a low friction material.

Examples of the low-friction material include metal materials such as stainless steel and Ni-Ti alloy, hydrophilic materials such as hyaluronic acid, polyurethane resins, low-density polyethylene, high-density polyethylene, and linear low-density polyethylene, such as polyethylene and polypropylene. And at least one material selected from the group consisting of fluororesins such as PTFE (polytetrafluoroethylene).
The low friction material desirably contains a fluorine-based resin, a polyurethane-based resin, or a hydrophilic material.

  When selecting a branch blood vessel, the tip of the guide wire does not necessarily have to protrude forward from the distal opening of the catheter. For example, when the distal end of the guide wire is shaped in a certain direction, the distal end of the guide wire is accommodated in the lumen without protruding from the distal opening of the catheter. The shape of the distal portion of the catheter may be changed along the shape of the tube, and the branch vessel may be selected.

At least one of the enlarged diameter portion 21b and the proximal protrusion 13c is formed of a deformable elastic material. Therefore, at the time of the extraction operation, at least one portion of the enlarged diameter portion 21b and the proximal side protruding portion 13c is deformed, and the enlarged diameter portion 21b is more easily released from the accommodating portion 13d. Is extremely smooth.
It is more desirable that the enlarged diameter portion 21b and the proximal side protruding portion 13c are both formed from a deformable elastic material.

Examples of the elastic material include elastomers, natural rubber, or isoprene rubber, silicone rubber, urethane rubber, styrene-butadiene rubber, fluorine rubber, acrylic rubber, and other synthetic rubbers, polyamide-based, polyester-based, and other thermoplastic elastomers. Is mentioned.
The deformable elastic material desirably includes an elastomer, and more desirably includes various thermoplastic elastomers.

As shown in FIG. 1, the shape of the enlarged diameter portion 21 b in a free state that is not in a deformed state is a ring-shaped protrusion formed on the outer surface of the distal end portion 21 of the guide wire 20.
The protrusion of the enlarged diameter portion 21b is formed so as to come into contact with the distal protrusion 13b when the enlarged diameter portion 21b is accommodated in the accommodating portion 13d.
Further, when the projection of the enlarged diameter portion 21b is formed of a deformable elastic material, as shown in FIG. 2, even if the enlarged diameter portion 21b abuts on the proximal protruding portion 13c, the enlarged diameter portion 21b deform | transforms and the enlarged diameter part 21b is open | released from the accommodating part 13d.
The protrusion of the enlarged diameter portion 21b does not come into contact with the proximal protruding portion 13c so that the enlarged diameter portion 21b is released from the accommodating portion 13d when the guide wire 20 is removed from the inner cavity 13. It may be formed.

As for the largest protrusion length P of the enlarged diameter part 21b, it is desirable that it is 0.05-0.6 mm.
The length of the enlarged diameter portion 21b is desirably 1 to 50 mm.

Moreover, the front-end | tip part 21 is shaped in the fixed direction. Therefore, it becomes easy to select a blood vessel by rotating the distal end portion 21 of the guide wire 20.
Even if the distal end portion 21 of the guide wire 20 is shaped, the distal portion 12 of the catheter 10 is usually flexible and can be deformed to some extent, so that the guide wire 20 is inserted into the lumen 13. And is not so much an obstacle to removing.

  Hereinafter, other configurations of the catheter kit according to the present embodiment will be described.

  First, the configuration of the catheter 10 will be described in detail.

  The catheter 10 includes an inner layer 14, a reinforcing member 15 formed on the inner layer 14, an intermediate layer 16 in which the reinforcing member 15 is embedded, an outer layer 17 formed on the intermediate layer 16, and the above-described layers. The housing portion 13d is formed, and the tip portion 18 is located at the forefront.

The inner layer 14 is a hollow tube made of resin, and has a lumen 13 into which the guide wire 20 can be inserted.
As a resin material for forming the inner layer 14, for example, a fluorine resin such as PTFE is desirable. This is because the sliding resistance with the guide wire 20 is reduced.

As the reinforcing member 15, for example, a braid formed by knitting a plurality of strands, a coil formed by winding a single strand or a plurality of strands, or the like may be employed.
In the example shown in FIGS. 1 and 2, a braid is used as the reinforcing member 15.

  As the material of the wire constituting the braid or coil, for example, martensitic stainless steel, ferritic stainless steel, austenitic stainless steel, austenitic, ferrite duplex stainless steel, precipitation hardened stainless steel, etc., superelasticity such as Ni-Ti alloy It is desirable to be formed from a material such as an alloy, tungsten, or a radiopaque metal such as platinum, gold, or tungsten.

  Examples of the resin material that forms the intermediate layer 16 and the outer layer 17 include polyamide, polyamide elastomer, polyester, polyurethane, and the like. Of these, polyamide elastomer is desirable.

The distal tip 18 is a cylindrical member that forms the distal opening 12 a of the catheter 1.
On the inner surface of the distal tip 18, the distal projecting portion 13 b, the proximal projecting portion 13 c and the housing portion 13 d having the above-described configuration are formed.

  The tip 18 may contain 65 to 90% by weight of radiopaque powder such as tungsten or bismuth, and a radiopaque ring formed of platinum or tungsten is embedded. Also good. This is because the visibility during the procedure can be improved.

  Next, the configuration of the guide wire 20 will be described in detail.

  The guide wire 20 has a front end portion 21 and a rear end portion 22, a core shaft 23 that forms the central axis of the guide wire 20, a first coil body 24 wound around the outer periphery of the front end portion 21, The second coil body 25 is wound around the outer periphery of the one coil body 24.

The core shaft 23 is formed of a small-diameter leading end portion 21, a tapered intermediate portion 26 coupled to the leading end portion 21, and a large-diameter rear end portion 22 coupled to the intermediate portion 26.
For this reason, the core shaft 23 gradually becomes less rigid and flexible as it goes from the rear end 22 side toward the front end 21 side.

  The second coil body 25 is formed by winding a single strand 27 in a spiral shape, and is a substantially linear tubular body having a through hole inside.

  Inside the second coil body 25, the tip 21 of the core shaft 23, a part of the intermediate part 26 of the core shaft 23, and the parts of the tip 21 and the intermediate part 26 of the core shaft 23 are covered. One coil body 24 is inserted.

The first coil body 24 is a multi-row coil body formed by winding a plurality of strands 30 in a spiral shape, and is a substantially linear tubular body having a through hole inside.
For this reason, the first coil body 24 is less likely to be plastically deformed as compared with a single coil formed by winding a single strand. Further, when one end portion of the first coil body 24 is rotated, the other end portion easily follows and rotates, and the rotation followability is high. Since the first coil body 24 having high rotation followability is disposed at the distal end portion 21 of the guide wire 20, the distal end portion 21 of the guide wire 20 can be rotated more easily.

  The first coil body 24 has a front end portion 31 inside a position spaced from the foremost end of the second coil body 25 toward the rear end side, and has a rear end portion 32 inside the enlarged diameter portion 21b. Yes.

Examples of the material for forming the strand 30 forming the first coil body 24 or the strand 27 forming the second coil body 25 include, for example, superelastic alloys such as stainless steel and Ni-Ti alloy, piano wires, A material such as a tungsten wire can be used.
Examples of the stainless steel include stainless steels such as martensitic stainless steel, ferritic stainless steel, austenitic stainless steel, austenite, ferrite duplex stainless steel, and precipitation hardened stainless steel.
Among these, austenitic stainless steel is desirable, and SUS304, SUS316 or SUS316L is more desirable.

  The tip of the tip 21 of the core shaft 23 and the tip of the second coil body 25 are fixed to each other by a tip brazing part 33.

  The tip brazing portion 33 has a conical shape, and the apex of the cone forms the forefront of the guide wire 20.

  The intermediate portion 26 of the core shaft 23 and the rearmost end of the second coil body 25 are fixed to each other by a rear end brazing portion 34. In addition, the second coil body 25 and the core shaft 23 are fixed to each other by one or a plurality of intermediate brazing portions 35 formed at arbitrary positions. In addition, the intermediate brazing part 35 does not need to be formed.

The leading edge of the first coil body 24 and the tip portion 21 of the core shaft 23 are fixed to each other by an inner tip brazing portion 36, and the rearmost end of the first coil body 24 and the intermediate portion 26 are the inner rear end. They are fixed to each other by a brazing part 37.
One or a plurality of inner intermediate brazing portions for fixing the first coil body 24 and the tip portion 21 and the intermediate portion 26 of the core shaft 23 to each other may be formed at an arbitrary position.

The distal end portion 21 of the guide wire 20 has such a length that the leading edge can protrude forward from the distal opening 12 a of the catheter 10.
Further, the distal end portion 21 of the guide wire 20 protruding forward from the distal opening 12a is bent in a certain direction at a certain angle and is shaped.
The shaping angle depends on the inner diameter of the blood vessel in which the target lesion is present, but is preferably 5 to 40 °, for example, and the shaping length is preferably 0.5 to 5 mm, for example.

  A connector 30 is attached to the proximal portion 11 of the catheter 10 so that the catheter 10 and the guide wire 20 can be integrally operated by being grasped by an operator. Inside the connector 30, a lumen communicating with the lumen 13 and the proximal opening 11a of the catheter 10 is formed, and the guide wire 20 can be inserted therethrough.

(Modification)
In the catheter kit according to the present invention, the protrusion length of the distal protrusion and the protrusion length of the proximal protrusion may be substantially the same.
In this case, at least one of the enlarged diameter portion and the proximal protruding portion is formed of a deformable elastic material, so that the enlarged diameter portion is accommodated when the guide wire is removed from the lumen. It is desirable that it is formed so as to be easily released from the part.

In the catheter kit according to the present invention, the entire tip may be formed of a deformable elastic material, and at least one of the distal protrusion and the housing may be coated with a low friction material. .
Thereby, it is set as the structure by which the proximal side protrusion part is formed from the elastic material which can deform | transform, and at least 1 part of a distal side protrusion part and an accommodating part is formed from the low friction material. it can.

  In the catheter kit according to the present invention, the guide wire is formed of a core shaft, a second coil body wound around the outer periphery of the core shaft, and a necessary brazed portion, and the first coil body is disposed. It may not be.

In the catheter kit according to the present invention, the enlarged-diameter portion may be a hoop-like body formed by winding a strand forming a part of the second coil body with a larger space between the core shaft. (See FIG. 4). The enlarged-diameter portion made of such a bump-like body is deformable to some extent because a space is formed between the strand and the core shaft, and can exhibit the same effect as the above-described deformable elastic body. it can. 4 corresponds to the configuration denoted by the reference numerals in FIGS. 1 and 2.
Further, the enlarged diameter portion may be formed from a plurality of protrusions that are formed on the outer peripheral surface of the tip portion and protrude outward in the radial direction.

  In the catheter kit according to the present invention, the distal end portion of the guide wire is not shaped in a certain direction, and may be substantially linear from the rear end portion to the distal end portion.

  In the catheter kit according to the present invention, the distal end portion of the guide wire may not protrude forward from the distal opening portion of the catheter, and in this case, the distal end portion of the guide wire may be shaped in a certain direction. desirable.

  In the catheter kit according to the present invention, the type of the guide wire is not limited to the above-described coil-type guide wire including the core shaft and the coil, and the plastic clad guide including the core shaft and a resin covering the outer periphery of the core shaft. It may be a wire or other type of guide wire.

  In the catheter kit according to the present invention, the distal projecting portion, the proximal projecting portion, and the housing portion may be formed on the inner surface of the tip as described above, or located on the distal opening side. It may be formed on the inner surface of the inner layer.

  The catheter kit of the present invention can be suitably used for treating diseases of various organs such as the heart, liver, and brain.

DESCRIPTION OF SYMBOLS 1 Catheter kit 10 Catheter 11 Proximal part 12 Distal part 11a Proximal opening part 12a Distal opening part 13 Lumen 13a Inner side surface 13b Distal protrusion part 13c Proximal protrusion part 13d Storage part 20 Guide wire 21 Guide wire or core shaft distal end portion 22 Guide wire or core shaft rear end portion 21b Diameter expansion portion of guide wire

Claims (9)

A catheter having a proximal portion and a distal portion, and having a lumen communicating from a proximal opening that opens to the proximal portion to a distal opening that opens to the distal portion;
A catheter kit having a distal end portion and a rear end portion, and a guide wire formed so that the distal end portion is inserted from the proximal opening portion and can be inserted into the lumen to the distal opening portion. Because
A diameter-expanded portion is formed on the outer surface of the tip portion,
The inner surface of the lumen in the distal portion has a distal protrusion protruding in the direction of the central axis of the lumen, and protrudes in the direction of the central axis of the lumen, than the distal protrusion. A proximal protrusion located on the proximal portion side, and an accommodating portion formed between the distal protrusion and the proximal protrusion, are formed,
When inserting the pre-Symbol guidewire into the lumen, the said enlarged portion and can be accommodated in the accommodation portion, when removed the guidewire from the lumen, the said enlarged diameter portion A catheter kit, wherein the catheter kit is movable from the accommodating portion to the proximal protruding portion . The catheter kit according to claim 1, wherein a protrusion length of the distal protrusion is greater than a protrusion length of the proximal protrusion. The catheter kit according to claim 1 or 2, wherein at least one of the enlarged diameter portion and the proximal protrusion is formed of a deformable elastic material. At least one portion of said distal side projection and the receiving portion, the catheter kit according to any one of claims 1 to 3 which is formed of a low friction material. The elastic material includes an elastomer,
The catheter kit according to claim 4, wherein the low friction material includes a fluorine resin, a polyurethane resin, or a hydrophilic material. It said upset portion, the catheter kit according to any one of claims 1 to 5 consisting of the tip ring-shaped projection formed on the outer surface of the. The tip catheter kit according to any one of claims 1 to 6 that are shaping in a certain direction. The guide wire used for the catheter kit in any one of Claims 1-7. The catheter used for the catheter kit in any one of Claims 1-7.

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