JP2023143226A - Medical tubular body transport device - Google Patents

Abstract

To provide a medical tubular body transport device capable of inserting easily, a guide wire into a lumen of a tip end tip, and suppressing deviation of the guide wire inserted into a lumen of the tip end tip, and achieving preferable operation property.SOLUTION: A medical tubular body transport device for transporting into a body, a medical tubular body, comprises: an outside tube in which the medical tubular body is arranged on the lumen; an inside tube provided in the lumen of the outside tube; and a tip end tip which is fixed to a distal end of the inside tube through an adhesive material. The tip end tip has a lumen extending in a long axis direction, the lumen is communicated with the lumen of the inside tube, the part of the adhesive material extends inward, relative to the inside surface of the tip end tip.SELECTED DRAWING: Figure 1

Description

The present invention relates to a medical tubular body transport device.

In recent years, minimally invasive treatment techniques for transporting and placing medical tubular bodies within the body have been developed. Examples of medical tubular bodies used include stents, stent grafts, obturators, injection catheters, and prosthetic valves. Among these, stents are medical tubular bodies that are generally used to treat various diseases caused by narrowing or occlusion of body lumens.

The medical tubular body is transported into the body through the body lumen using a transport device. The transport device includes an outer tube, and is inserted into the body lumen while holding the medical tubular body in the inner lumen of the outer tube. The medical tubular body that has been transported to a predetermined position within the body is released from the inner lumen of the outer tube, thereby being placed (indwelled) at a predetermined position within the body.

When transporting a medical tubular body into the body using a transport device, first, a guide wire is passed through the body lumen, and then a guide wire is placed at the distal end of the medical tubular body transport device along the guide wire. Insert the medical tubular body until it reaches the lesion. However, even if the guide wire is placed in advance in this way, medical tubes may be difficult to use due to the stent previously placed in the body lumen, narrowed parts of the body lumen, or sharp bends in the body lumen. The body transport device may not be able to advance and its ability to follow the guide wire may deteriorate.

A catheter in which the followability of a catheter (transport device) to a guide wire is improved is described in Patent Document 1. The catheter described in Patent Document 1 is tapered so that the inner diameter of the distal end thereof is narrowed. This reduces the clearance between the inner periphery of the distal end and the outer periphery of the guidewire, preventing the guidewire from becoming eccentric at the distal end of the catheter and from wobbling. As a result, the ability of the catheter to follow the guide wire is improved.

Japanese Patent Application Publication No. 2006-149442

As in Patent Document 1, narrowing the inner diameter of the distal end of the catheter improves the ability of the catheter to follow the guidewire, but narrowing the inner diameter of the distal end of the catheter makes it difficult to insert the guidewire.

The present invention has been made in view of these circumstances, and its purpose is to facilitate the insertion of a guide wire into the lumen of the distal tip, and to suppress wobbling of the guide wire passed through the lumen of the distal tip. The object of the present invention is to provide a medical tubular body transport device with good operability.

The present invention is as follows.
[1] A medical tubular body transporting device for transporting a medical tubular body into the body, which comprises: an outer tube in which the medical tubular body is disposed in the inner cavity; and an outer tube in which the medical tubular body is disposed in the inner cavity of the outer tube. an inner tube; and a distal tip fixed to a distal end of the inner tube via an adhesive material, the distal tip having a lumen extending in the longitudinal direction. , the lumen communicates with the lumen of the inner tube, and a portion of the adhesive material extends further inward than the inner surface of the distal tip.
[2] The medical tubular body conveying device according to [1], wherein a portion of the adhesive material extends inward from the inner surface of the inner tube.
[3] The medical tubular body conveying device according to [1] or [2], wherein a portion of the adhesive material extends to a portion of the inner periphery of the distal tip.
[4] The adhesive material according to any of [1] to [3], wherein a portion of the adhesive material extends inward from the inner surface of the inner tube and extends to a portion of the inner periphery of the inner tube. The medical tubular body transport device according to any one of the above.
[5] A void area S1 of the inner cavity of the distal tip in a cross section perpendicular to the longitudinal direction on the distal side of a position where a part of the adhesive material extends inward from the inner surface of the distal tip. , a void area S2 of the lumen in a cross section perpendicular to the longitudinal direction at a position where a portion of the adhesive material extends inward from the inner surface of the distal tip, and a portion of the adhesive material. The void area S3 of the inner lumen of the inner tube in a cross section perpendicular to the long axis direction on the proximal side of the position where S extends inward than the inner surface of the distal tip is expressed by the following formula. The medical tubular body transport device according to any one of [1] to [4], which is satisfied.
S2<S1≦S3
[6] The medical tubular body conveying device according to any one of [1] to [5], wherein the outside of the distal end of the inner tube is covered with the proximal end of the distal tip.
[7] The medical tubular body transport device according to any one of [1] to [5], wherein an X-ray opaque marker is arranged at the distal end of the inner tube.

In the medical tubular body conveying device according to the present invention, the distal tip is fixed to the distal end of the inner tube via an adhesive material, and a part of the adhesive material is larger than the inner surface of the distal tip. It extends inward. Therefore, even without narrowing the inner diameter of the tip of the tip, the extended adhesive material holds the guidewire passed through the lumen of the tip, suppressing the wobbling of the guidewire and transporting medical tubular objects. The operability of the device is improved. In addition, the guidewire insertion property remains good. Furthermore, by extending a portion of the adhesive material to a portion of the inner periphery of the distal tip, performance is improved both in terms of suppressing wobbling of the guide wire and ensuring slidability.

FIG. 1 is a sectional view showing an embodiment of a medical tubular body conveying device according to the present invention. FIG. 2 is a sectional view showing a state in which the core material is inserted into the lumen of the inner tube.

A medical tubular body transport device according to the present invention is a medical tubular body transport device that transports a medical tubular body into a body, and includes an outer tube in which the medical tubular body is disposed in the inner cavity, and an outer tube. and a distal tip secured to the distal end of the inner tube via an adhesive material. The distal tip has a lumen extending in the longitudinal direction, the lumen communicating with the lumen of the inner tube, and a portion of the adhesive material is disposed within the inner tube. It extends inward from the side. A portion of the adhesive material extends inward from the inner surface of the distal tip, thereby locally reducing the lumen diameter of the distal tip. Therefore, when the guide wire is passed through the lumen of the distal tip, the guide wire is held by the adhesive material present at the location where the lumen diameter is locally reduced. As a result, wobbling during sliding of the guide wire is suppressed without narrowing the inner diameter of the tip of the distal tip. Therefore, according to the present invention, it is possible to maintain good guidewire insertion performance while also suppressing wobbling when the guidewire slides.

Hereinafter, the medical transport device according to the present invention will be described in more detail based on the embodiments, but the present invention is not limited by the embodiments below, and within the scope that can comply with the spirit of the above and below. It is of course possible to implement the invention with modifications, all of which are included within the technical scope of the present invention. In addition, in each drawing, hatching, member codes, etc. may be omitted for convenience, but in such cases, the specification and other drawings shall be referred to. Further, the dimensions of various members in the drawings are given priority to help understanding the features of the present invention, and therefore may differ from actual dimensions. In the following, the proximal side refers to the user's (operator's) hand side, and the distal side refers to the side opposite to the proximal side (ie, the treatment target side). Further, the direction from the proximal side to the distal side is referred to as the long axis direction or the far-near direction.

FIG. 1 is a cross-sectional view showing one embodiment of a medical tubular body transport device according to the present invention, showing only the distal portion of the medical tubular body transport device. In FIG. 1, the right side of arrow x is the proximal side, and the left side of arrow x is the distal side.

The medical tubular body conveying device 1 includes an outer tube 2 in which a medical tubular body (not shown) is disposed, an inner tube 3 disposed in the inner cavity of the outer tube 2, and an inner tube 3. A distal tip 4 is fixed to the distal end of the tip via an adhesive material 5. The distal tip 4 has a lumen extending in the longitudinal direction x, and the lumen communicates with the lumen of the inner tube 3.

A portion of the adhesive material 5 extends inward from the inner surface 4a of the distal tip 4. As a result, the guide wire inserted into the lumen of the distal tip 4 is held by the adhesive material 5 extending inward from the inner surface 4a of the distal tip 4, so that wobbling can be suppressed and the guide wire inserted into the lumen of the distal tip 4 can be The operability of the body transport device 1 is improved. Further, according to the present invention, since the adhesive material 5 disposed at the fixed position between the inner tube 3 and the distal tip 4 extends inward from the inner surface 4a of the distal tip 4, the distal tip 4 Even without narrowing the inner diameter of the distal end of the guide wire, it is possible to suppress the wobbling of the guide wire while maintaining good insertion performance of the guide wire.

The adhesive material 5 only needs to extend inward from the inner surface 4a of the distal tip 4. Although the adhesive material 5 may extend over the entire inner circumference of the distal tip 4, it is preferable that the adhesive material 5 extends over a portion of the inner circumference of the distal tip 4. By extending a portion of the adhesive material 5 to a portion of the inner periphery of the distal tip 4, performance is improved in terms of both suppressing wobbling of the guide wire and ensuring slidability.

When the adhesive material 5 extends to a part of the inner circumference of the distal tip 4, it may extend to one place or to two or more places, but it may extend to two or more places. It is preferable that it be released. By extending the guide wire to two or more locations, wobbling of the guide wire can be further suppressed.

When the adhesive material 5 extends to two or more locations on the inner periphery of the distal tip 4, the locations where the adhesive material 5 extends may be at equal intervals in the circumferential direction or may be at non-equal intervals. , equally spaced is preferred. Equal spacing allows the guidewire to be held at the center of the shaft.

As the adhesive material 5, for example, organic adhesives can be used, and specifically, urethane resin adhesives, epoxy resin adhesives, olefin adhesives, cyanoacrylate adhesives, and silicone adhesives. A resin adhesive such as a resin adhesive can be used. Among these, it is preferable to use urethane resin adhesives.

The distal tip 4 extends in the far-to-near direction and has a lumen. By disposing the distal tip 4, it becomes easier for the medical tubular body transport device 1 to pass through a narrowed part of the body lumen. Examples of the external shape of the distal tip 4 in a cross section perpendicular to the long axis direction x include a circular shape, a C-shape, an elliptical shape, and a polygonal shape. Preferably, the maximum inner diameter of the distal tip 4 is larger than the outer diameter of the inner tube 3.

The distal tip 4 is preferably made of a flexible material.

Examples of materials constituting the tip 4 include polyolefin resins such as polyethylene and polypropylene; polyamide resins such as nylon; polyester resins such as polyethylene terephthalate (PET); and polyether ether ketone resins (PEEK). Aromatic polyetherketone resin; polyether polyamide resin; polyurethane resin; polyimide resin; fluorine-based resins such as polytetrafluoroethylene (PTFE), perfluoroalkoxyalkane (PFA), and ethylenetetrafluoroethylene copolymer (ETFE) Examples include synthetic resins such as resins; polyvinyl chloride resins; silicone resins; and the like. These may be used alone or in combination of two or more. Among these, the material constituting the tip 4 is preferably polyamide resin, and more preferably polyamide elastomer. By configuring the distal tip 4 in this way, it becomes possible to provide the medical tubular body transport device 1 that achieves both the ability of the distal tip 4 to follow the guide wire and the safety of the distal tip.

The distal tip 4 may be composed of one member, or may be composed of two or more members. It is preferable that the distal tip 4 is composed of two or more members (particularly two members). It is preferable that the distal tip 4 has a taper in which the outer diameter decreases from the proximal side to the distal side. Thereby, the passage of the medical tubular body transport device 1 into the living body lumen can be improved.

The distal tip 4 is secured to the distal end of the inner tube 3 via an adhesive material 5.

As the material constituting the inner tube 3, known resins can be used, such as polyolefin resins such as polyethylene and polypropylene; polyamide resins such as nylon; polyester resins such as polyethylene terephthalate (PET); Aromatic polyether ketone resins such as ether ether ketone resins (PEEK); polyether polyamide resins; polyurethane resins; polyimide resins; polytetrafluoroethylene (PTFE), perfluoroalkoxyalkanes (PFA), ethylenetetrafluoro Examples include synthetic resins such as fluororesins such as ethylene copolymer (ETFE); polyvinyl chloride resins; silicone resins; and natural rubber. These may be used alone or in combination of two or more. Among these, the materials constituting the inner tube 3 are preferably polyolefin resins, polyamide resins, aromatic polyetherketone resins, polyurethane resins, and fluororesins. By containing at least one of a polyolefin resin, a polyamide resin, an aromatic polyether ketone resin, a polyurethane resin, and a fluorine resin, the slipperiness on the inner surface of the inner tube 3 is improved. A guide wire is inserted into the inner lumen of the tube 3, and the medical tubular body transport device 1 can be easily sent into the body along the guide wire.

The inner tube 3 may have a single layer structure or a multilayer structure. In the case of a multilayer structure, for example, a structure including a braided layer such as a metal braid as an intermediate layer of the inner tube 3 can be mentioned. By having a multilayer structure, the tensile strength of the inner tube 3, the slipperiness with respect to the inner tube 3, and the kink resistance can be improved. Examples of the metal braid include stainless steel, carbon steel, nickel titanium alloy, and the like. Among these, stainless steel is preferred.

The stiffness on the distal side of the inner tube 3 is preferably lower than the stiffness on the proximal side of the inner tube 3. By increasing the rigidity of the proximal side of the inner tube 3, the pushability of the medical tubular body conveying device 1 can be improved. In order to reduce the rigidity on the distal side of the inner tube 3, the inner tube 3 is configured to have a distal inner tube and a proximal inner tube, and the rigidity of the distal inner tube is equal to the rigidity of the proximal inner tube. One example is to make it lower. For example, the distal inner tube may have a single layer structure made of synthetic resin, and the proximal inner tube may have a multilayer structure having the above-mentioned metal braid as an intermediate layer of synthetic resin.

Preferably, a portion of the adhesive material 5 further extends inward from the inner surface 3a of the inner tube 3. Since the adhesive material 5 further extends inward from the inner surface 3a of the inner tube 3, it is possible to prevent the guide wire from wobbling.

The adhesive material 5 only needs to extend inward from the inner surface 3a of the inner tube 3. The adhesive material 5 may extend over the entire inner circumference of the inner tube 3, but preferably extends over a portion of the inner circumference of the inner tube 3. By extending a portion of the adhesive material to a portion of the inner periphery of the inner tube 3, performance is improved in terms of both suppressing wobbling of the guide wire and ensuring slidability.

When the adhesive material 5 extends to a part of the inner circumference of the inner tube 3, it may extend to one place or to two or more places, but it may extend to two or more places. It is preferable that it be released. By extending the guide wire to two or more locations, wobbling of the guide wire can be further suppressed.

When the adhesive material 5 extends to two or more locations on the inner circumference of the inner tube 3, the locations where the adhesive material 5 extends may be at equal intervals in the circumferential direction or may be at non-equal intervals. , equally spaced is preferred. Equal spacing allows the guidewire to be held at the center of the shaft.

The medical tubular body conveying device 1 according to the present invention has an inner surface in a cross section perpendicular to the longitudinal direction x at a position s2 where a part of the adhesive material 5 extends inward from the inner surface 4a of the distal tip 4. The void area S2 of the cavity and the cross section perpendicular to the long axis direction x at the position s1 distal to the position s2 where a part of the adhesive material 5 extends inward from the inner surface 4a of the distal tip 4. The void area S1 of the inner cavity of the tip 4 and the longitudinal direction x at a position s3 proximal to the position s2 where a portion of the adhesive material 5 extends inward from the inner surface 4a of the tip 4. It is preferable that the void area S3 of the inner cavity of the inner tube 3 in a vertical cross section satisfies the relationship expressed by the following formula.
S2<S1≦S3

When the gap area S1, the gap area S2, and the gap area S3 satisfy the relationship expressed by the above formula, it is possible to prevent the guide wire from wobbling.

A void area S2 of the lumen in a cross section perpendicular to the long axis direction x at a position s2 where a part of the adhesive material 5 extends inward from the inner surface 4a of the distal tip 4 is a part of the adhesive material 5. smaller than the void area S1 of the lumen of the distal tip 4 in a cross section perpendicular to the long axis direction x at the position s1 distal to the position s2 where the portion extends inward from the inner surface 4a of the distal tip 4; The void area S2 is preferably 99% or less, more preferably 98% or less, still more preferably 97% or less, when the void area S1 is 100%. Although the lower limit of the ratio of the void area S2 to the void area S1 is not particularly limited, the void area S2 is preferably 95% or more, more preferably 96% or more, and still more preferably It is 97% or more.

The inner lumen of the inner tube 3 in a cross section perpendicular to the longitudinal direction x at a position s3 on the proximal side of the position s2 where a part of the adhesive material 5 extends inward than the inner surface 4a of the distal tip 4. The void area S3 is the distal tip in a cross section perpendicular to the long axis direction x at a position s1 distal to the position s2 where a part of the adhesive material 5 extends inward from the inner surface 4a of the distal tip 4. It is preferable that the gap area S3 is the same as or larger than the gap area S1 of the inner cavity No. 4, and it is more preferable that the gap area S3 is the same as the gap area S1. The void area S3 is preferably 110% or less, more preferably 108% or less, still more preferably 107% or less, and most preferably 100%, when the void area S1 is 100%. That is, the lumen diameter d3 of the inner tube 3 at the position s3 proximal to the position s2 where a part of the adhesive material 5 extends inward from the inner surface 4a of the distal tip 4 is It is preferable that the lumen diameter d1 of the distal tip 4 at the position s1 on the distal side of the position s2 where a portion extends inward from the inner surface 4a of the distal tip 4 is the same as or larger, and the lumen More preferably, the diameter d3 is the same as the lumen diameter d1.

The void area S1, the void area S2, and the void area S3 may be calculated by, for example, taking a photograph of a cross section at each position and performing image analysis.

The distal end of the inner tube 3 and the proximal end of the distal tip 4 may be butted, but as shown in FIG. Preferably it is covered at the proximal end. This firmly fixes the distal tip 4 and the inner tube 3, making it difficult for the distal tip 4 to separate.

The ratio of the length L2 in the longitudinal direction x of the inner tube 3 covered with the distal tip 4 to the length L1 in the longitudinal direction x of the distal tip 4 is preferably 10% or more, more preferably is 15% or more, more preferably 20% or more. The ratio of length L2 to length L1 is preferably 65% or less, more preferably 60% or less, still more preferably 55% or less.

Preferably, the distal end of the inner tube 3 is provided with a radiopaque marker. This makes it easier to grasp the position of the distal tip 4. When the distal end of the inner tube 3 and the proximal end of the distal tip 4 are butted against each other, the preferred position for placing the radiopaque marker is the distal end of the inner tube 3; If the outside of the distal end of tube 3 is covered with the proximal end of tip 4, the area of the distal end of inner tube 3 covered by tip 4 or the tip A position corresponding to the proximal end of tip 4 is preferred.

The shape of the X-ray opaque marker is not particularly limited, and may be cylindrical, or may be cylindrical with a C-shaped cross section perpendicular to the long axis direction x.

The X-ray opaque marker contains an X-ray opaque substance, and examples of the X-ray opaque substance include lead, barium, iodine, tungsten, gold, platinum, iridium, stainless steel, titanium, cobalt chromium alloy, etc. Can be mentioned. Among these, it is preferable to include platinum.

An outer tube 2 is arranged outside the inner tube 3, and a medical tubular body (not shown) is arranged in the inner lumen of the outer tube 2.

As the material constituting the outer tube 2, known resins can be used, such as polyolefin resins such as polyethylene and polypropylene; polyamide resins such as nylon; polyester resins such as PET; and aromatic polyester resins such as PEEK. Synthetic resins such as ether ketone resins; polyether polyamide resins; polyurethane resins; polyimide resins; fluorine resins such as PTFE, PFA, and ETFE; polyvinyl chloride resins; and the like. The material constituting the outer tube 2 is preferably a polyamide resin such as nylon or a polyether polyamide resin. By using polyamide-based resin or polyether polyamide-based resin, it has high strength, good wear resistance, low coefficient of friction, and improved workability.

The outer tube 2 may have a single layer structure or a multilayer structure. Examples of the multilayer structure include a structure in which the outer tube 2 has a braided layer such as a metal braid as an intermediate layer, a structure in which the inner layer is made of fluorine resin, and the outer layer is made of polyamide resin. By having a multilayer structure, the tensile strength of the outer tube 2, the slipperiness with respect to the outer tube 2, and the kink resistance can be improved. Examples of the metal braid include stainless steel, carbon steel, nickel titanium alloy, and the like. Among these, stainless steel is preferred.

The outer diameter of the outer tube 2 is, for example, preferably 0.5 mm or more, more preferably 0.7 mm or more, still more preferably 1.0 mm or more. When the inner diameter of the outer tube 2 is constant, by increasing the outer diameter of the outer tube 2, the wall thickness of the outer tube 2 can be increased, so that the tensile strength of the outer tube 2 can be increased. The outer diameter of the outer tube 2 is, for example, preferably 3.5 mm or less, more preferably 3.3 mm or less, still more preferably 3.0 mm or less. By setting the outer diameter of the outer tube 2 within this range, it is possible to prevent the outer diameter on the distal side of the medical tubular body conveying device 1 from becoming too large, thereby improving the minimally invasive nature of the medical tubular body conveying device 1. You can improve. Moreover, since the rigidity of the distal side of the medical tubular body transport device 1 can be prevented from becoming too large, operability during delivery into the body can be improved.

The wall thickness of the outer tube 2 is, for example, preferably 10 μm or more, more preferably 30 μm or more, and still more preferably 50 μm or more. By setting the wall thickness of the outer tube 2 within this range, the tensile strength of the outer tube 2 can be increased, and the safety of the medical tubular body conveying device 1 can be improved. The wall thickness of the outer tube 2 is, for example, preferably 350 μm or less, more preferably 300 μm or less, still more preferably 250 μm or less. By setting the wall thickness of the outer tube 2 within this range, the inner lumen of the outer tube 2 can be made wider, so that the types of diameters of medical tubular bodies that can be stored in the inner lumen of the outer tube 2 can be increased. , various types of medical tubular bodies can be transported by the medical tubular body transporting device 1.

The wall thickness of the inner tube 3 may be smaller than or larger than the wall thickness of the outer tube 2, but is preferably the same as the wall thickness of the outer tube 2.

Examples of the medical tubular body arranged in the inner lumen of the outer tube 2 include a stent, a stent graft, an obturator, an injection catheter, a prosthetic valve, and the like. Stents are generally used to treat various diseases caused by narrowing or occlusion of in-vivo lumens such as digestive tracts such as bile ducts or blood vessels. Stents include, for example, a coiled stent made of a single wire of metal, a stent made by cutting out a metal tube with a laser, a stent assembled by laser welding wire members, and a stent made of multiple wires. Examples include stents made by weaving metals, or stents that have the same shape as these metal stents and are made of polymeric materials. Preferably, the stent is a self-expanding stent. A self-expanding stent is a stent that has the ability to expand by itself by removing the outer tube 2 that restricts the expansion of the stent.

Next, an example of a method for manufacturing the medical tubular body transport device according to the present invention will be described.

The medical tubular body conveying device according to the present invention includes a step of inserting a core material into the inner lumen of an inner tube (hereinafter sometimes referred to as a core material insertion step), and a step of inserting a core material into the inner lumen of the inner tube. A step of disposing an adhesive material (hereinafter sometimes referred to as an adhesive material disposing step) and a step of disposing a distal tip outside the distal end of the inner tube (hereinafter sometimes referred to as a distal tip disposing step) ), and a step of fixing the distal end of the inner tube and the distal tip (hereinafter sometimes referred to as distal tip fixing step). Each step will be explained below.

[Core material insertion process]
In the core material insertion step, the core material 6 is inserted into the inner cavity of the inner tube 3. FIG. 2 is a cross-sectional view showing a state in which the core material is inserted into the inner cavity of the inner tube 3. In FIG. 2, the right side of arrow x is the proximal side, and the left side of arrow x is the distal side. The same members as in FIG. 1 are given the same reference numerals to avoid redundant explanation.

The inner tube 3 extends in the distance direction, and the core material 6 is inserted into the lumen at least at the distal end of the inner tube 3. By arranging the core material 6 in the inner cavity of the inner tube 3, the inner cavity of the inner tube 3 can be prevented from decreasing.

The core material 6 inserted into the inner cavity of the inner tube 3 may have an abutting member 6a disposed at the distal end of the core material 6. When the abutment member 6a is arranged at the distal end of the core material 6, the proximal end surface of the abutment member 6a does not contact the distal end surface of the inner tube 3, and the abutment member It is preferable to insert it into the distal end of the inner tube 3 with a gap left between the proximal end surface of the inner tube 6a and the distal end surface of the inner tube 3. By leaving a gap between the proximal end surface of the abutment member 6a and the distal end surface of the inner tube 3, a part of the adhesive material 5 is placed inside the inner surface 4a of the distal tip 4 in a later step. It can be extended to Therefore, wobbling of the guide wire can be reduced.

When the abutment member 6a is arranged at the distal end of the core material 6, the distance of the gap between the proximal end surface of the abutment member 6a and the distal end surface of the inner tube 3 is, for example, 0.05 mm to 5 mm. It is preferably at least 0.08 mm, still more preferably at least 0.1 mm, more preferably at most 3 mm, even more preferably at most 1 mm.

The materials of the core material 6 and the abutting member 6a are not particularly limited, but for example, metal materials such as copper, silver, aluminum, and stainless steel can be used.

[Adhesive material placement process]
In the adhesive material placement step, adhesive material 5 is placed on the outside of the distal end of inner tube 3 .

The shape of the adhesive material 5 is not particularly limited, and various shapes can be used, such as a film, a belt, a sheet, a powder, a thread, a net, a ring, a cylinder, and a liquid. Among these, film-like, belt-like, sheet-like, ring-like, cylindrical, or liquid-like forms are preferred.

When the shape of the adhesive material 5 is, for example, cylindrical, a part of the adhesive material 5 is placed outside the distal end of the inner tube 3 in order to extend inward beyond the inner surface 4a of the distal tip 4. When the cylindrical adhesive material 5 is placed on the inner tube 3, it is preferable that the cylindrical adhesive material 5 covers at least a portion of the distal end surface of the inner tube 3.

[Top tip placement process]
In the tip placement step, the tip 4 is placed outside the distal end of the inner tube 3. If the shape of the adhesive material 5 is liquid, for example, by disposing the distal tip 4 on the outside of the distal end of the inner tube 3, the liquid adhesive material 5 can be spread between the distal tip 4 and the inner tube 3. It oozes out from the abutting portion to the inside of the inner surface 4a of the distal tip 4.

[Tip fixation process]
In the distal tip fixing step, the distal end of the inner tube 3 and the distal tip 4 are fixed. The distal tip 4 is fixed to the distal end of the inner tube 3 via the adhesive material 5 described above.

After the distal tip 4 is fixed, the outer tube 2 may be placed outside the inner tube 3 according to a known method, and the medical tubular body may be placed in the inner cavity of the outer tube 2. When placing the outer tube 2 on the outside of the inner tube 3, a medical tubular body is placed in the inner lumen of the outer tube 2 in advance, and the medical tubular body is placed in the inner lumen of the outer tube 2. The tube 2 may be placed outside the inner tube 3.

In the adhesive material placement step, after placing the adhesive material 5 on the outside of the distal end of the inner tube 3, the core material 6 may be left in the lumen of the inner tube 3, or the core material 6 may be left in the inner lumen of the inner tube 3. The core material 6 may be removed from the cavity. When the core material 6 is removed from the inner lumen of the inner tube 3, when fixing the distal end of the inner tube 3 and the distal tip 4 in the distal tip fixing step, the distal tip 4 and the distal tip of the inner tube 3 are removed again. A core material 6 may be placed at the distal end.

1 Medical tubular body conveyance device 2 Outer tube 3 Inner tube 3a Inner surface of inner tube 4 Distal tip 4a Inner surface of distal tip 5 Adhesive material 6 Core material 6a Abutment member x Long axis direction

Claims (7)

A medical tubular body transport device for transporting a medical tubular body into the body,
an outer tube in which the medical tubular body is disposed;
an inner tube disposed in the lumen of the outer tube;
a distal tip fixed to the distal end of the inner tube via an adhesive material;
It has
the distal tip has a longitudinally extending lumen that communicates with the lumen of the inner tube;
A part of the adhesive material extends inward from an inner surface of the distal tip. The medical tubular body conveying device according to claim 1, wherein a portion of the adhesive material extends inward from the inner surface of the inner tube. The medical tubular body conveying device according to claim 1 or 2, wherein a portion of the adhesive material extends to a portion of the inner periphery of the distal tip. 4. The adhesive material according to claim 1, wherein a portion of the adhesive material extends inward from the inner surface of the inner tube and extends over a portion of the inner circumference of the inner tube. Medical tubular body transport device. a void area S1 of the lumen of the distal tip in a cross section perpendicular to the longitudinal direction distal to a position where a portion of the adhesive material extends inward from the inner surface of the distal tip;
a void area S2 of the lumen in a cross section perpendicular to the longitudinal direction at a position where a portion of the adhesive material extends inward from the inner surface of the distal tip;
The void area S3 of the inner lumen of the inner tube in a cross section perpendicular to the longitudinal direction on the proximal side of the position where a part of the adhesive material extends inward than the inner surface of the distal tip is as follows: The medical tubular body transport device according to any one of claims 1 to 4, which satisfies the relationship expressed by the following formula.
S2<S1≦S3 6. The medical tubular body conveying device according to claim 1, wherein the outside of the distal end of the inner tube is covered with the proximal end of the distal tip. The medical tubular body transport device according to any one of claims 1 to 6, wherein an X-ray opaque marker is arranged at a distal end of the inner tube.

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