WO2023176701A1

WO2023176701A1 - Medical tubular body conveyance device

Info

Publication number: WO2023176701A1
Application number: PCT/JP2023/009169
Authority: WO
Inventors: 芽衣深見; 健太郎鈴木; 絵里奈佐野; 想生市村
Original assignee: 株式会社カネカ
Priority date: 2022-03-17
Filing date: 2023-03-09
Publication date: 2023-09-21

Abstract

Provided is a medical tubular body conveyance device comprising: a first tube (3) that has a first reinforcement section (11) in which a medical tubular body (10) is disposed and a reinforcement layer is provided; and a second tube (4) that has a second reinforcement section (12) which is disposed closer to a proximal side than the first tube (3) and in which a reinforcement layer is provided. A part of one of the first tube (3) and the second tube (4) is inserted into a part of the other to constitute a tube overlap portion (8). The tube overlap portion (8) has a reinforcement layer overlap section (14) of the first reinforcement section (11) and the second reinforcement section (12). At least one of the first tube (3) and the second tube (4) has a non-reinforcement section (13). In the non-reinforcement section (13), the first tube (3) and the second tube (4) are joined to each other. The first reinforcement section (11) extends from the reinforcement layer overlap section (14) on a distal side of the tube overlap portion (8). The second reinforcement section (12) extends from the reinforcement layer overlap section (14) on the proximal side of the tube overlap portion (8).

Description

Medical tubular body transport device

The present invention relates to a medical tubular body delivery device that is a device for transporting a medical tubular body such as a stent into the body.

Medical tubular bodies, typified by stents, are medical devices used to treat various diseases caused by narrowing or obstruction of body lumens such as the digestive tract, such as the bile duct or pancreatic duct, or blood vessels, such as the iliac artery. . Medical tubular bodies include those that are placed in a lesioned area such as a stenotic or occluded area to expand it from the inside and maintain the inner diameter of the body cavity, and those that are placed in the lesioned area to maintain the inner diameter of the body cavity, or those that are used to remove blood clots that have occurred in or around the lesioned area. There is a method that involves removing the wound from the body and restoring the inner diameter of the body cavity in the affected area.

As a medical tubular body delivery device, for example, Patent Document 1 discloses a catheter including an outer tube and an inner tube inserted into the outer tube, and a stent accommodated in the outer tube. A catheter is disclosed that is made of a resin tube in which a reinforcing layer made of a line is embedded. Patent Document 2 has an outer sheath, an inner shaft disposed coaxially inside the outer sheath, and a self-expanding stent housed within the outer sheath, and the outer sheath has an outer polymer layer and an inner polymer layer. A stent delivery device is disclosed comprising a wire reinforcement layer located therebetween.

Japanese Patent Application Publication No. 2012-75453 Japanese Patent Application Publication No. 11-313893

Although various medical tubular body transport devices have been proposed in the past, it is desirable that the medical tubular body transport device be able to stably perform the operation of indwelling the medical tubular body in the body. The present invention has been made in view of the above-mentioned circumstances, and an object thereof is to provide a medical tubular body transporting device that can stably perform an operation for indwelling a medical tubular body in the body.

The medical tubular body transport device of the present invention that can solve the above problems is as follows.
[1] A device for transporting a medical tubular body into the body,
a first tube extending in the longitudinal direction, having a housing portion in which the medical tubular body is disposed, and having a first reinforcing section comprising a reinforcing layer made of wire;
a second tube extending in the longitudinal direction and having a second reinforcing section including a reinforcing layer made of wire;
A part of one of the first tube and the second tube is inserted into a part of the other, and a part of the one and a part of the other constitute a tube overlapping part, and The first tube extends distally from the distal end of the tube overlapping part, and the second tube extends proximally from the proximal end of the tube overlapping part,
The tube overlapping section has a reinforcing layer overlapping section in which the first reinforcing section and the second reinforcing section are arranged to overlap,
At least one of the first tube and the second tube has a non-reinforced section without the reinforcing layer in the tube overlapping portion, and the first tube and the second tube are joined to each other in the non-reinforced section. is,
The first reinforcing section extends from the reinforcing layer overlapping section to the distal end of the tube overlapping section, and extends further distally than the distal end of the tube overlapping section,
The second reinforcing section is a medical tubular body that extends from the reinforcing layer overlapping section to the proximal end of the tube overlapping section and further proximally than the proximal end of the tube overlapping section. Conveyance device.

Since the medical tubular body transport device of the present invention has the first tube and the second tube configured as described above as the shaft portion, the first tube and the second tube can be firmly joined to each other, and The rigidity from the first tube to the second tube can be increased. Therefore, when the first tube and the second tube are pulled proximally to indwell the medical tubular body in the body, the first tube and the second tube are difficult to stretch, and the first tube and the second tube break. is also less likely to occur. Moreover, even if large frictional resistance occurs between the first tube and the medical tubular body, kinks are less likely to occur in the first tube. Therefore, the first tube and the second tube can be stably pulled toward the proximal side, and the operation of indwelling the medical tubular body in the body can be performed stably.

Preferred embodiments of the medical tubular body transport device of the present invention are as follows.
[2] The medical tubular body transport device according to [1], which satisfies at least one of the following requirements (A) and (B).
(A) In the tube overlap portion, the first tube has the non-reinforced section, and the non-reinforced section includes a first non-reinforced section adjacent to the proximal side of the first reinforced section, and a first non-reinforced section adjacent to the first reinforced section on the proximal side; a second non-reinforced section proximal to the non-reinforced section; the first tube is not joined to the second tube in the first reinforced section and the first non-reinforced section; It is joined to the second tube at a non-reinforced section.
(B) In the tube overlapping portion, the second tube has the non-reinforced section, and the non-reinforced section includes a third non-reinforced section adjacent to the distal side of the second reinforced section, and the third non-reinforced section. a fourth non-reinforced section distal to the non-reinforced section; the second tube is not joined to the first tube in the second reinforced section and the third non-reinforced section; It is joined to the first tube at a non-reinforced section.
[3] The medical tubular body transport device according to [1], which satisfies at least one of the following requirements (C) and (D).
(C) In the tube overlapping portion, the first tube has the non-reinforced section, and the first tube is joined to the second tube at the non-reinforced section and the reinforcing layer overlap section.
(D) In the tube overlapping portion, the second tube has the non-reinforced section, and the second tube is joined to the first tube at the non-reinforced section and the reinforcing layer overlap section.
[4] The medical tubular body transport device according to any one of [1] to [3], wherein the first tube and the second tube are joined to each other by welding.
[5] The medical tubular body transport device according to any one of [1] to [4], wherein the first tube has the non-reinforced section in the tube overlapping portion.
[6] The medical tubular body transport device according to [5], wherein the non-reinforced section is provided at the proximal end of the first tube.
[7] The medical tubular body transport device according to [5] or [6], wherein the inner surface of the first tube is made of the same resin material from the non-reinforced section to at least a portion of the first reinforced section. .
[8] The medical tubular body transport device according to any one of [1] to [7], wherein the second tube is inserted into the first tube in the tube overlapping portion.
[9] The first tube has an inner layer, an outer layer, and the reinforcing layer disposed between them, and has the non-reinforced section in the tube overlapping portion, and the inner layer of the first tube has a first inner layer extending from the distal end of the first reinforcing section to at least the proximal end of the storage section; and a first inner layer provided on the proximal side of the first inner layer and extending from the first reinforcing section to the non-reinforcing section. The medical tubular body transport device according to [8], further comprising a second inner layer that is present in the medical tubular body.
[10] The first inner layer is made of a fluororesin, a polyolefin resin, a polyimide resin, or a polyamideimide resin, and the second inner layer is made of a polyester resin, a polyamide resin, a polyether polyamide resin, a polyolefin resin, or an aromatic polyamide resin. The medical tubular body transport device according to [9], which is made of an ether ketone resin, a polyimide resin, a polyamideimide resin, or a polyurethane resin.
[11] The second tube has an inner layer, an outer layer, and the reinforcing layer disposed between them, and the outer layer of the second tube is made of polyester resin, polyamide resin, polyether polyamide resin, polyolefin resin, aromatic The medical tubular body transport device according to any one of [8] to [10], which is made of a group polyetherketone resin, a polyimide resin, a polyamideimide resin, or a polyurethane resin.

The medical tubular body transport device of the present invention can stably pull the first tube and the second tube toward the proximal side, and can stably perform the operation of indwelling the medical tubular body in the body. .

1 is an overall schematic diagram of a medical tubular body transport device according to an embodiment of the present invention. 2 shows a configuration example of a distal portion of a shaft portion of the medical tubular body conveying device shown in FIG. 1. FIG. 2 shows a configuration example of a distal portion of a shaft portion of the medical tubular body conveying device shown in FIG. 1. FIG. 2 shows a configuration example of a distal portion of a shaft portion of the medical tubular body conveying device shown in FIG. 1. FIG. In the configuration example of the distal portion of the shaft portion shown in FIG. 2, an example of a joining mode of the first tube and the second tube is shown. In the configuration example of the distal portion of the shaft portion shown in FIG. 3, an example of a joining mode of the first tube and the second tube is shown. In the example of the structure of the distal part of the shaft part shown in FIG. 2, another example of the joining aspect of a 1st tube and a 2nd tube is shown. In the example of the structure of the distal part of the shaft part shown in FIG. 3, another example of the joining aspect of the 1st tube and the 2nd tube is shown. An example of a cross-sectional view along the longitudinal direction of the first tube having a non-reinforced section is shown. An example of the configuration of a shaft portion having a first tube and a second tube is shown. An example of the configuration of a shaft portion having a first tube and a second tube is shown. An example of the configuration of a shaft portion having a first tube and a second tube is shown.

Hereinafter, the present invention will be specifically explained based on the following embodiments, but the present invention is not limited by the following embodiments, and changes may be made as appropriate within the scope of the above and below objectives. Of course, it is also possible to carry out the invention, and all of these 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.

The configuration of the medical tubular body transport device will be described with reference to FIGS. 1 to 8. FIG. 1 shows an overall schematic diagram of a medical tubular body transport device according to an embodiment of the present invention, and FIGS. 2 to 4 show a distal portion of a shaft portion of the medical tubular body transport device shown in FIG. FIGS. 5 to 8 show examples of how the first tube and the second tube are joined at the distal portion of the shaft portion.

The medical tubular body transport device 1 is a medical device that transports a medical tubular body 10 into the body. The medical tubular body conveying device 1 is an elongated device having a shaft portion 2 , and a medical tubular body 10 is disposed in the inner cavity of the shaft portion 2 . By using the medical tubular body 10, it is possible to treat various diseases caused by narrowing or occlusion of a digestive tract such as a bile duct or a lumen in a living body such as a blood vessel. The length of the shaft portion 2 in the longitudinal direction may be, for example, about 800 mm to 3000 mm. In the following description, the medical tubular body transport device may be simply referred to as a "transport device."

The shaft portion 2 extends in the longitudinal direction, and has a proximal side and a distal side with respect to the longitudinal direction. In the transport device 1, the proximal side refers to the user's hand side, and the distal side refers to the direction opposite to the proximal side, that is, the direction toward the treatment target side. In each drawing, the right side of the drawing corresponds to the proximal side, and the left side of the drawing corresponds to the distal side.

In the case of treatment using an endoscope, the shaft portion 2 is inserted into the forceps channel through the forceps port of the endoscope and transported to the lesion site. It is preferable that an operating section 9 is provided on the proximal side of the shaft section 2. By operating the operating section 9, the medical tubular body 10 is exposed to the outside of the shaft section 2 inside the patient's body, and the medical tubular body 10 is exposed to the outside of the shaft section 2. The body 10 can be placed within the body.

As shown in FIGS. 2 to 4, the shaft portion 2 has a first tube 3 and a second tube 4 disposed on the proximal side of the first tube 3. The first tube 3 and the second tube 4 each extend in the longitudinal direction and are joined to each other. Specifically, a portion of either the first tube 3 or the second tube 4 is inserted into a portion of the other, and a portion of one and a portion of the other constitute a tube overlapping portion 8. The first tube 3 extends distally from the distal end of the tube overlapping part 8, and the second tube 4 extends proximally from the proximal end of the tube overlapping part 8. 2 to 4 show an example in which the second tube 4 is inserted into the first tube 3. Furthermore, in FIGS. 2 to 4 and FIGS. 5 to 8, which will be described later, the portion of the second tube 4 inserted into the first tube 3 is shown by a solid line instead of a dotted line to facilitate understanding.

The medical tubular body 10 is arranged in the inner cavity of the first tube 3. The first tube 3 has a housing portion 16 in which the medical tubular body 10 is placed. The first tube 3 is arranged at the distal part of the shaft part 2. The length in the longitudinal direction of the first tube 3 can be appropriately set according to the length in the longitudinal direction of the medical tubular body 10 disposed in the inner cavity. It can be longer than the longitudinal length of the tubular body 10, for example, about 50 mm to 800 mm. The outer diameter of the first tube 3 may be, for example, about 0.5 mm to 3.5 mm, and the inner diameter of the first tube 3 may be, for example, about 0.3 mm to 3.4 mm.

The second tube 4 extends more proximally than the proximal end of the first tube 3. The second tube 4 may extend to the proximal portion of the shaft portion 2 or may extend halfway to the proximal portion of the shaft portion 2 . The outer diameter of the second tube 4 may be, for example, about 0.5 mm to 3.5 mm, and the inner diameter of the second tube 4 may be, for example, about 0.3 mm to 3.4 mm.

A typical example of the medical tubular body 10 is a stent. The medical tubular body 10 includes a coiled medical tubular body formed from a single linear metal or polymer material, and a medical tubular body formed by cutting out a metal tube or a tube made of a polymer material using a laser or the like. There are medical tubular bodies made by welding and assembling linear members, and medical tubular bodies made by weaving multiple linear metals. Examples of the medical tubular body 10 include, in addition to stents, stent grafts, obturators, injection catheters, prosthetic valves, and the like.

From the perspective of an expansion mechanism, the medical tubular body 10 is a balloon that (i) mounts the medical tubular body on the surface of the balloon, transports it to a diseased area, and expands the medical tubular body with the balloon at the diseased area; Classified into expandable medical tubular bodies and (ii) self-expanding medical tubular bodies that are transported to the lesioned area in a state where expansion is suppressed and expand by themselves by removing the member that suppresses expansion at the lesioned area. can do. The transport device 1 is suitably used to transport a self-expanding medical tubular body, and the first tube 3 functions as a member that suppresses expansion of the medical tubular body 10. When the medical tubular body 10 is disposed in the inner lumen of the first tube 3, it contracts in the radial direction and extends in the longitudinal direction, so that the medical tubular body 10 is in a reduced diameter state, which is a cylindrical shape that is more elongated than in the expanded state. becomes. After transporting the medical tubular body 10 to the affected area, the first tube 3 and the second tube 4 are slid proximally with respect to the medical tubular body 10, so that the medical tubular body 10 is attached to the shaft portion 2. Exposed to the outside, the medical tubular body 10 expands in the radial direction and is placed in the body.

It is preferable that the shaft portion 2 has a first tube 3 and a second tube 4 as outer tubes, and an inner tube 5 is disposed in the inner cavity of the first tube 3 and second tube 4. It is preferable that the medical tubular body 10 is disposed between the first tube 3 and the inner tube 5 while being mounted on the transport device 1 . The first tube 3 and the second tube 4 are provided so as to be slidable in the longitudinal direction with respect to the inner tube 5. Thereby, the medical tubular body 10 can be stably held in the inner cavity of the first tube 3, and when the medical tubular body 10 is placed in the body, the first tube 3 and the second tube 4 can be kept close together. This makes it easier to stably perform the operation of exposing the medical tubular body 10 by pulling it toward the patient's side.

The inner tube 5 is arranged at least at the distal part of the shaft part 2 and may extend to the proximal part of the shaft part 2. The inner lumen of the inner tube 5 can function as an insertion path for a guide wire. In the case of an over-the-wire type delivery device, the inner tube 5 preferably extends from the distal part of the shaft part 2 to the proximal part of the shaft part 2, and in the case of a rapid exchange type delivery device, the inner tube 5 preferably extends from the distal part of the shaft part 2 to the proximal part of the shaft part 2 Preferably, the tube 5 extends halfway from the distal part of the shaft part 2 to the proximal part of the shaft part 2.

It is preferable that each tube, such as the first tube 3, second tube 4, and inner tube 5, is made of resin. Examples of the resin constituting the tube include polyester resins such as polyethylene terephthalate, polyamide resins such as nylon, polyolefin resins such as polyethylene and polypropylene, aromatic polyether ketone resins such as PEEK, polyurethane resins, polyether polyamide resins, and polyimides. Examples include synthetic resins such as resins, polyamide-imide resins, fluororesins such as PTFE, PFA, and ETFE, polyvinyl chloride resins, and silicone resins. The tube may have a reinforcing layer made of wire, and the reinforcing layer will be explained later.

It is preferable that the inner tube 5 is provided with a stopper 6 on the proximal side of the medical tubular body 10. A stopper 6 is attached to the outer surface of the inner tube 5. The stopper 6 is placed in contact with the proximal end of the medical tubular body 10 or in the vicinity of the proximal end of the medical tubular body 10 . By providing the stopper 6 on the proximal side of the medical tubular body 10, the stopper 6 comes into contact with the proximal end of the medical tubular body 10 when the first tube 3 and the second tube 4 are pulled proximally. , the medical tubular body 10 is prevented from being pulled toward the proximal side together with the first tube 3. This makes it easy to expose the medical tubular body 10 to the outside of the shaft portion 2. For example, the stopper 6 has a portion that comes into contact with the proximal end of the medical tubular body 10 when the first tube 3 and the second tube 4 are pulled proximally. It is preferable that they be located within 10 mm from each other.

The shape of the stopper 6 can be, for example, a ring shape. The outer diameter of the stopper 6 is preferably less than or equal to the inner diameter of the first tube 3 and greater than or equal to the inner diameter of the medical tubular body 10 disposed in the inner cavity of the first tube 3. The stopper 6 can be made of resin, metal, or a composite material thereof. In particular, it is preferable that the stopper 6 is made of elastomer resin, thereby preventing deformation or damage to the medical tubular body 10 when the stopper 6 and the medical tubular body 10 come into contact. It is preferable to use a polyamide resin as the elastomer resin, which increases the rigidity of the stopper 6 and allows the stopper 6 to support the proximal end of the medical tubular body 10 and effectively deploy the medical tubular body 10. I can do it.

Preferably, the distal end of the inner tube 5 is provided with a distal tip 7. Preferably, the distal tip 7 has a lumen that communicates with the lumen of the inner tube 5. The distal tip 7 constitutes the distal end of the shaft portion 2, and thereby, when the shaft portion 2 is inserted into the forceps channel of the endoscope and the medical tubular body 10 is conveyed to the lesion site, the shaft portion 2 This can prevent the tip from damaging the body lumen. Furthermore, the ability of the shaft portion 2 to follow the preceding guide wire or forceps channel and the ability to deliver the tip of the shaft portion 2 to the lesioned area can be improved, and the operability of the transport device 1 is improved.

It is preferable that the tip 7 is made of elastomer resin. Preferred examples of the elastomer resin include polyurethane resins, polyester resins, polyamide resins, etc., and it is particularly preferred to be composed of polyamide resins. By configuring the distal tip 7 in this manner, the ability of the distal tip 7 to follow the guide wire and the safety of the distal end of the shaft portion 2 can be improved.

The shaft portion 2 may be provided with an X-ray opaque marker. By providing the X-ray opaque marker on the shaft portion 2, the position of the shaft portion 2 in the body can be confirmed under X-ray fluoroscopy using the X-ray opaque marker as a landmark. The X-ray opaque marker is preferably provided in the vicinity of the portion of the shaft portion 2 where the medical tubular body 10 is disposed, and is preferably provided on the distal tip 7, the stopper 6, and the first tube 3. By providing an X-ray opaque marker on the distal tip 7, the position of the distal end of the shaft portion 2 can be confirmed under X-ray fluoroscopy. Further, by providing an X-ray opaque marker on the stopper 6, the position and extrusion state of the medical tubular body 10 can be confirmed under X-ray fluoroscopy. When an X-ray opaque marker is provided on the first tube 3, the timing at which the medical tubular body 10 is exposed from the first tube 3 can be determined under X-ray fluoroscopy. The number of X-ray opaque markers installed may be one or more.

The transport device 1 has a structure in which the first tube 3 has a reinforcing layer made of a wire material, since it becomes easy to pull the first tube 3 toward the proximal side when the medical tubular body 10 is indwelled in the body. Be prepared. Since the first tube 3 has the reinforcing layer, the rigidity and kink resistance of the first tube 3 are increased, and it becomes easier to slide the first tube 3 with respect to the medical tubular body 10 smoothly. In the first tube 3, the section provided with the reinforcing layer is referred to as a first reinforcing section 11. The second tube 4 also includes a reinforcing layer made of wire. In the second tube 4, the section provided with the reinforcing layer is referred to as a second reinforcing section 12.

Examples of the wire that constitutes the reinforcing layer include metal wires and fibers. Examples of the material constituting the metal wire include stainless steel such as SUS304 and SUS316, carbon steel, platinum, nickel, cobalt, chromium, titanium, tungsten, gold, nickel-titanium alloy, cobalt-chromium alloy, and tungsten alloy. Among them, stainless steel is preferred. The metal wire may be a single wire or a twisted wire. Examples of the fiber include polyarylate fiber, aramid fiber, ultra-high molecular weight polyethylene fiber, PBO fiber, and carbon fiber. The fibers may be monofilament or multifilament.

The arrangement pattern of the wire rods in the reinforcing layer is not particularly limited, and examples thereof include a spiral shape, a mesh shape, a braid shape, and the like. Among these, the wire rods of the reinforcing layer are preferably arranged in a braided manner, since the stiffness of the tube can be effectively increased by the reinforcing layer.

It is preferable that the first tube 3 has an inner layer, an outer layer, and a reinforcing layer disposed between them in the first reinforcing section 11. The second tube 4 preferably has an inner layer, an outer layer, and a reinforcing layer disposed between them in the second reinforcing section 12 . Thereby, the slidability of the inner and outer surfaces of the first tube 3 and the inner and outer surfaces of the second tube 4 can be improved. The inner layer and outer layer are preferably resin layers made of resin.

The first tube 3 may have a non-reinforced section 13 that does not have a reinforcing layer. The second tube 4 may have a non-reinforced section 13 without a reinforcing layer. Note that in the first tube 3, the storage portion 16 is preferably formed in the first reinforcing section 11, and it is more preferable that the entire storage portion 16 is formed in the first reinforcing section 11. Further, it is preferable that the first reinforcing section 11 extends from the tube overlapping section 8 to the storage section 16. The first tube 3 and the second tube 4 may be composed of a single layer or a plurality of layers in the non-reinforced section 13, and are preferably composed of a resin layer.

The first tube 3 and the second tube 4 are arranged so that the first reinforcing section 11 and the second reinforcing section 12 overlap in the tube overlapping part 8. In the tube overlapping portion 8, a section in which the first reinforcing section 11 and the second reinforcing section 12 are arranged to overlap is referred to as a reinforcing layer overlapping section 14. At least one of the first tube 3 and the second tube 4 has a non-reinforced section 13 that is not provided with a reinforcing layer in the tube overlapping portion 8, and the first tube 3 and the second tube 4 are connected in the non-reinforced section 13. joined to each other. With the first tube 3 and the second tube 4 connected in this way, the first reinforcing section 11 extends from the reinforcing layer overlapping section 14 to the distal end of the tube overlapping section 8 . The second reinforcing section 12 extends from the reinforcing layer overlapping section 14 to the proximal end of the tube overlapping section 8, and further extends from the proximal end of the tube overlapping section 8. It also extends proximally. By configuring the first tube 3 and the second tube 4 in this way, when the first tube 3 and the second tube 4 are pulled proximally, the pulling operation can be performed stably, and the medical The operation of indwelling the tubular body 10 in the body can be performed stably. This will be explained below.

Since the first reinforcing section 11 of the first tube 3 and the second reinforcing section 12 of the second tube 4 have reinforcing layers, the first tube 3 and the second tube 4 have high rigidity in these sections. On the other hand, it is less flexible. Therefore, when the first tube 3 and the second tube 4 are joined at a location where the first reinforcing section 11 and the second reinforcing section 12 overlap, the joining force between the first tube 3 and the second tube 4 tends to be insufficient. In this case, when the second tube 4 is pulled toward the proximal side, there is a possibility that the first tube 3 and the second tube 4 may become disconnected during the pulling process. In particular, since the medical tubular body 10 is disposed in the inner cavity of the first tube 3, when the first tube 3 and the second tube 4 are pulled proximally, the first tube 3 and the medical tubular body 10 are separated. Frictional resistance is generated between the first tube 3 and the second tube 4, and a large peeling force is likely to occur at the joint between the first tube 3 and the second tube 4. However, by joining the first tube 3 and the second tube 4 to each other in the non-reinforced section 13 of the first tube 3 or the second tube 4 at the tube overlap part 8, the first tube 3 and the second tube 4 are strengthened. Can be joined to. That is, since the first tube 3 or the second tube 4 is formed to be flexible in the non-reinforced section 13, the mutual adhesion increases in the non-reinforced section 13, and the bonding force between the first tube 3 and the second tube 4 is increased. be able to.

The first reinforcing section 11 of the first tube 3 extends distally from the reinforcing layer overlap section 14 beyond the distal end of the tube overlap section 8, and the second reinforcing section 12 of the second tube 4 extends from the reinforcing layer overlap section 14 distally beyond the distal end of the tube overlap section 8. It extends proximally from the overlap section 14 beyond the proximal end of the tube overlap section 8 . In other words, the reinforcing layer of the first tube 3 and the second tube 4 is continuous from the proximal end of the tube overlapping part 8 to the distal end of the tube overlapping part 8. Existing. Therefore, the rigidity of the shaft portion 2 from the first tube 3 to the second tube 4 is increased, the pushability when inserting the shaft portion 2 into the forceps channel of the endoscope is improved, and kink resistance is increased. When pulling the first tube 3 and the second tube 4 proximally to indwell the medical tubular body 10 in the body, the first tube 3 and the second tube 4 are difficult to stretch, and the first tube 3 and the second tube 4 are difficult to stretch. Since the breaking strength of the two tubes 4 is also increased, the towing operation can be performed stably.

The non-reinforced section 13 of the tube overlapping portion 8 may be formed only on one of the first tube 3 and the second tube 4, or may be formed on both. FIG. 2 shows an example in which a non-reinforced section 13 is formed in the first tube 3, and FIG. 3 shows an example in which a non-reinforced section 13 is formed in the second tube 4. FIG. 4 shows an example in which non-reinforced sections 13 are formed in both the first tube 3 and the second tube 4. When the non-reinforced section 13 is formed in both the first tube 3 and the second tube 4, the non-reinforced section 13 of the first tube 3 and the non-reinforced section 13 of the second tube 4 are They are arranged so as not to overlap each other in the longitudinal direction. Further, the first tube 3 and the second tube 4 may be joined to each other only in one of the non-reinforced section 13 of the first tube 3 and the non-reinforced section 13 of the second tube 4, and the non-reinforced section 13 of the first tube 3 may be joined to each other. The first tube 3 and the second tube 4 may be joined to each other in both the reinforced section 13 and the non-reinforced section 13 of the second tube 4.

The first tube 3 may have only one section provided with a reinforcing layer in the tube overlapping portion 8, or may have a plurality of sections. In the latter case, the section provided with the most distal reinforcing layer in the tube overlapping section 8 is defined as the first reinforcing section 11, and the first reinforcing section 11 extends from the reinforcing layer overlapping section 14 to the distal side of the tube overlapping section 8. It is sufficient that the tube extends to the end and extends further distally than the distal end of the tube overlapping portion 8 . The first reinforcing section 11 starts from the reinforcing layer overlapping section 14 and continuously extends from there to the distal side of the distal end of the tube overlapping section 8 . The first reinforcing section 11 extends from the distal end of the tube overlapping section 8 to the distal side of the distal end of the storage section 16 and may extend to the distal end of the first tube 3. The first reinforcing section 11 also extends from the distal end of the tube overlapping section 8 to the distal side of the distal end of the storage section 16 and extends halfway to the distal end of the first tube 3. There may be. Note that it is preferable that the first tube 3 has only one section provided with a reinforcing layer in the tube overlapping portion 8.

The second tube 4 may have only one section provided with a reinforcing layer in the tube overlapping portion 8, or may have a plurality of sections. In the latter case, the section provided with the reinforcing layer closest to the proximal side in the tube overlapping section 8 is defined as the second reinforcing section 12, and the second reinforcing section 12 extends from the reinforcing layer overlapping section 14 to the proximal side of the tube overlapping section 8. It is sufficient that it extends to the end and further distal than the proximal end of the tube overlapping portion 8 . The second reinforcing section 12 starts from the reinforcing layer overlapping section 14 and extends continuously from there to the proximal side of the proximal end of the tube overlapping section 8 . The second reinforcing section 12 may extend to the proximal end of the second tube 4 or may extend halfway to the proximal end of the second tube 4 . Note that it is preferable that the second tube 4 has only one section provided with a reinforcing layer in the tube overlapping portion 8.

The first tube 3 and the second tube 4 only need to be joined to each other at least in part of the non-reinforced section 13 of the first tube 3 and/or the second tube 4 in the tube overlapping section 8, and further in the reinforcing layer overlapping section. They may be joined to each other at 14. The first tube 3 and the second tube 4 can be joined to each other by known joining means such as adhesion or welding.

The first tube 3 and the second tube 4 may be joined to each other only in a part of the non-reinforced section 13, for example, and an example in which the first tube 3 and the second tube 4 are joined in this way is shown in FIG. Shown in Figure 6. FIG. 5 shows an example of the joining mode of the first tube and the second tube in the configuration example of the distal part of the shaft part shown in FIG. 2, and FIG. An example of the joining aspect of the 1st tube and the 2nd tube in the example of a structure is shown.

In FIG. 5, the first tube 3 has a non-reinforced section 13 in the tube overlapping section 8, and the non-reinforced section 13 is a first tube adjacent to the proximal side of the first reinforced section 11 (reinforcement layer overlap section 14). The first tube 3 has a non-reinforced section 13A and a second non-reinforced section 13B on the proximal side of the first non-reinforced section 13A. 4, and is joined to the second tube 4 at the second non-reinforced section 13B to form a joined section 15. In FIG. 5, the second non-reinforced section 13B (joint section 15) extends to the proximal end of the first tube 3, while the second non-reinforced section 13B (joint section 15) It does not have to extend all the way to the tip. For example, in the tube overlapping portion 8, the first tube 3 and the second tube 4 may be unjoined on the proximal side of the second non-reinforced section 13B.

In FIG. 6, in the tube overlapping section 8, the second tube 4 has a non-reinforced section 13, and the non-reinforced section 13 has a third section adjacent to the distal side of the second reinforced section 12 (reinforcement layer overlap section 14). The second tube 4 has a non-reinforced section 13C and a fourth non-reinforced section 13D distal to the third non-reinforced section 13C. 3, and is joined to the first tube 3 at a fourth non-reinforced section 13D to form a joined section 15. In FIG. 6, the fourth non-reinforced section 13D (joint section 15) extends to the distal end of the second tube 4; It does not have to extend all the way to the tip. For example, in the tube overlapping portion 8, the second tube 4 and the first tube 3 may be unjoined on the distal side of the fourth non-reinforced section 13D.

When the first tube 3 and the second tube 4 are joined as described above, when an excessive load is applied to the first tube 3 or the second tube 4 when the medical tubular body 10 is placed in the body, the It is possible to prevent the medical tubular body 10 from being deployed out of position, and to prevent internal tissue from being damaged by the medical tubular body 10 or the shaft portion 2. Specifically, when the first tube 3 and the second tube 4 are pulled proximally, if the inner surface of the first tube 3 gets caught on the medical tubular body 10, the first tube 3 and the second tube 4 Excessive load is applied. At that time, if the first tube 3 and the second tube 4 are forcibly pulled proximally, the entire shaft portion 2 will be pulled proximally, and the medical tubular body 10 will be expanded from its intended position. Otherwise, the accumulated force may be released all at once, causing the medical tubular body 10 and the shaft portion 2 to injure internal tissue. However, if the first tube 3 and the second tube 4 are joined as described above, when an excessive load is applied to the first tube 3 or the second tube 4, the first tube 3 or the second tube 4 is likely to break in the first non-reinforced section 13A or the third non-reinforced section 13C, and it is possible to prevent the medical tubular body 10 from expanding under unreasonable force. Therefore, it is possible to prevent the medical tubular body 10 from being deployed out of the intended position and to prevent the medical tubular body 10 and the shaft portion 2 from damaging internal tissues.

The first tube 3 and the second tube 4 may be provided with a non-reinforced section 13 on only one of them, and may be joined to each other in a part of the non-reinforced section 13 as described above. Both of the second tubes 4 may be provided with non-reinforced sections 13, and both non-reinforced sections 13 may be partially joined to each other as described above. Note that when the first tube 3 and the second tube 4 are joined to each other only in a part of the non-reinforced section 13, it is preferable that they be joined in the former manner.

The first tube 3 and the second tube 4 are joined to each other in the non-reinforced section 13 and may be further joined to each other in the reinforced layer overlap section 14. An example in which the first tube 3 and the second tube 4 are joined in this way is shown in FIGS. 7 and 8. FIG. 7 shows another example of the joining mode of the first tube and the second tube in the configuration example of the distal part of the shaft part shown in FIG. 2, and FIG. 8 shows the distal part of the shaft part shown in FIG. 3 shows another example of the joining aspect of the first tube and the second tube in the configuration example of the section.

In FIG. 7, the first tube 3 has a non-reinforced section 13 in the tube overlapping section 8, and the first tube 3 is joined to the second tube 4 at the non-reinforced section 13 and the reinforcing

layer overlap section

14, 15 is formed. In FIG. 7, in the tube overlapping section 8, the first tube 3 is joined to the second tube 4 at a part of the non-reinforced section 13 and a part of the reinforcing layer overlap section 14; The reinforcing layer overlapping section 14 may be joined to the second tube 4 at the entire reinforcing layer overlapping section 14 . Preferably, the first tube 3 is continuously joined to the second tube 4 from the non-reinforced section 13 to the reinforced layer overlapping section 14.

In FIG. 8, the second tube 4 has a non-reinforced section 13 in the tube overlapping section 8, and the second tube 4 is joined to the first tube 3 at the non-reinforced section 13 and the reinforcing

layer overlap section

14, and 15 is formed. In FIG. 8, in the tube overlapping section 8, the second tube 4 is joined to the first tube 3 at a part of the non-reinforced section 13 and a part of the reinforcing layer overlap section 14; The reinforcing layer overlapping section 14 may be joined to the first tube 3 at the entire reinforcing layer overlapping section 14 . Preferably, the second tube 4 is continuously joined to the first tube 3 from the non-reinforced section 13 to the reinforced layer overlapping section 14.

When the first tube 3 and the second tube 4 are joined as described above, kink resistance at the tube overlapping portion 8 is increased, and pushability when inserting the shaft portion 2 into the forceps channel of the endoscope is improved. . Further, when pulling the first tube 3 and the second tube 4 proximally, the force of pulling the first tube 3 proximally is easily transmitted to the second tube 4, and the pulling operation can be performed stably. Can be done. When both the first tube 3 and the second tube 4 have non-reinforced sections 13, the non-reinforced sections 13 of the first tube 3 and the non-reinforced sections 13 of the second tube 4 are joined to each other at one or both of them. It is sufficient if the reinforcing layers are joined to each other in the overlapping section 14.

It is preferable that the first tube 3 has a non-reinforced section 13 in the tube overlap portion 8 . The first tube 3 extending distally from the second tube 4 has a non-reinforced section 13, and the first tube 3 and the second tube 4 are joined to each other in the non-reinforced section 13 of the first tube 3. This makes it easier to pull the first tube 3 and second tube 4 toward the proximal side. By pulling the second tube 4 proximally, the entire first tube 3 is easily pulled proximally, so when the medical tubular body 10 is placed in the body, the first tube 3 and the second tube 4 becomes easier to pull smoothly toward the proximal side.

The unreinforced section 13 of the first tube 3 is preferably provided at the proximal end of the first tube 3. That is, it is preferable that the non-reinforced section 13 of the first tube 3 includes the proximal end of the first tube 3 and is formed in a predetermined range distally from the proximal end of the first tube 3. This makes it easy to join the first tube 3 and the second tube 4 with high adhesion over a wider range in the non-reinforced section 13 of the first tube 3.

It is preferable that the non-reinforced section 13 be formed in the tube located on the outer side of the tube overlap portion 8 between the first tube 3 and the second tube 4. For example, when the second tube 4 is inserted into the first tube 3 at the tube overlap portion 8 as shown in FIGS. 2 to 4, a non-reinforced section 13 is provided in the first tube 3 at the tube overlap portion 8. is preferred. Although not shown in the drawings, when the first tube 3 is inserted into the second tube 4 at the tube overlap portion 8, a non-reinforced section 13 is provided in the second tube 4 at the tube overlap portion 8. is preferred. As a result, when joining the first tube 3 and the second tube 4 by welding, the non-reinforced section 13 of the tube located on the outside in the tube overlap portion 8 is heated from the outside and joined to the tube located on the inside. It becomes easier.

In the tube overlapping portion 8, it is preferable that the second tube 4 is inserted into the first tube 3. The radial size of the first tube 3 is set according to the size of the medical tubular body 10 disposed in the inner cavity, but the radial size of the second tube 4 is It depends on whether it is placed inside or outside. By inserting the second tube 4 into the inner cavity of the first tube 3 in the tube overlapping portion 8, the radial size of the second tube 4 can be reduced, and the shaft portion 2 can be formed thin. I can do it.

It is preferable that the first tube 3 and the second tube 4 are joined to each other by welding. Thereby, the first tube 3 and the second tube 4 can be more firmly joined. Moreover, since the first tube 3 and the second tube 4 are joined to each other in the non-reinforced section 13 without a reinforcing layer, joining by welding is possible. More preferably, the second tube 4 is inserted into the first tube 3 at the tube overlap part 8, the first tube 3 has a non-reinforced section 13 at the tube overlap part 8, and the non-reinforcement section 13 of the first tube 3 has a non-reinforced section 13. The first tube 3 and the second tube 4 are joined to each other by welding. This makes it easy to join the first tube 3 and the second tube 4 by welding.

When the first tube 3 has a non-reinforced section 13 in the tube overlapping section 8, the inner surface of the first tube 3 is made of the same resin material from the non-reinforced section 13 to at least part of the first reinforced section 11. is preferred. When the inner surface of the first tube 3 is made of different resin materials with the first reinforced section 11 and the non-reinforced section 13 as the border, the first tube 3 has the border between the first reinforced section 11 and the non-reinforced section 13 as It becomes the boundary between the inner resin layer and the edge of the reinforcing layer. Therefore, when inserting the shaft portion 2 into the forceps channel of the endoscope and transporting it to a lesion site, or when pulling the first tube 3 proximally to expand the medical tubular body 10, the There is an increased possibility that the first tube 3 will break at the boundary between the first reinforced section 11 and the non-reinforced section 13. However, if the inner surface of the first tube 3 is made of the same resin material from the non-reinforced section 13 to at least part of the first reinforced section 11, then the first tube 3 is It becomes difficult to break at the boundary.

For the same reason as above, when the second tube 4 has the non-reinforced section 13 in the tube overlap part 8, the inner surface of the second tube 4 is the same from the non-reinforced section 13 to at least part of the second reinforced section 12. Preferably, it is made of a resin material. This makes it difficult for the second tube 4 to break at the boundary between the second reinforced section 12 and the non-reinforced section 13 when the shaft section 2 is inserted into the forceps channel of the endoscope and transported to the lesioned area.

When the inner surface of the first tube 3 is made of the same resin material from the non-reinforced section 13 to at least a portion of the first reinforced section 11, the first tube 3 has a structure in which the entire inner surface of the first reinforced section 11 is made of the same resin material. It may be made of a resin material, or a part of the inner surface of the first reinforcing section 11 and other parts may be made of different resin materials. When the inner surface of the second tube 4 is made of the same resin material from the non-reinforced section 13 to at least a portion of the second reinforced section 12, the second tube 4 has a structure in which the entire inner surface of the second reinforced section 12 is made of the same resin material. It may be made of a resin material, or a part of the inner surface of the second reinforcing section 12 and other parts may be made of different resin materials.

When the second tube 4 is inserted into the first tube 3 at the tube overlap part 8, the first tube 3 may have a part of the inner surface of the first reinforcing section 11 and the other part made of different types of resin. , it is preferable to configure them to have different characteristics. FIG. 9 shows a cross-sectional view along the longitudinal direction of the first tube 3 in a case where the first tube 3 has a non-reinforced section 13 at the tube overlapping portion 8. As shown in FIG. 9, the first tube 3 has an inner layer 17, an outer layer 18, and a reinforcing layer 19 disposed between them, and has a non-reinforced section 13 at the tube overlap part 8. The inner layer 17 includes a first inner layer 17A extending from the distal end of the first reinforcing section 11 to at least the proximal end of the storage section 16, and a first inner layer 17A that is provided on the proximal side of the first inner layer 17A. It is preferable to have a second inner layer 17B extending from 11 to the non-reinforced section 13. In this case, the first inner layer 17A may be made of a material with excellent sliding properties with the medical tubular body 10 or a high-strength material, and the second inner layer 17B may be made with a material with excellent adhesiveness or weldability with the second tube 4. When the medical tubular body 10 is placed in the body, the first tube 3 and the second tube 4 can be stably pulled proximally with ease. Note that the first inner layer 17A may extend toward the proximal side of the proximal end of the storage portion 16, but preferably does not extend to the non-reinforced section 13. Moreover, it is preferable that the first inner layer 17A extends to the distal end of the first tube 3.

When the first inner layer 17A is made of a material with excellent sliding properties or a high-strength material, it is preferable that the first inner layer 17A is made of, for example, a fluororesin, a polyimide resin, or a polyamideimide resin. As a result, when the first tube 3 is pulled proximally, the first tube 3 can be smoothly pulled proximally, or the first inner layer 17A is difficult to peel off from the reinforcing layer 19, and the medical tubular It becomes easier to perform the operation of indwelling the body 10 in the body.

From the viewpoint of improving sliding properties, the first inner layer 17A is preferably composed of a fluororesin such as PTFE. Alternatively, it is also preferable that the first inner layer 17A is made of resin that can reduce the coefficient of static friction. Examples of resins other than fluororesins that can reduce the coefficient of static friction include polyolefin resins such as polyethylene and polypropylene.

The second inner layer 17B is preferably made of a material with excellent adhesiveness and weldability. From this point of view, the second inner layer 17B is made of, for example, polyester resin, polyamide resin, polyether polyamide resin, polyolefin resin, aromatic It is preferable to use a group polyetherketone resin, a polyimide resin, a polyamideimide resin, or a polyurethane resin. Thereby, the adhesion and weldability of the second inner layer 17B to the second tube 4 can be improved. From the viewpoint of processability, the second inner layer 17B is more preferably made of polyester resin, polyamide resin, polyether polyamide resin, polyolefin resin, or polyamideimide resin.

When joining the first tube 3 and the second tube 4 by welding, the second inner layer 17B is preferably made of a thermoplastic resin with a relatively low melting point, such as polyester resin, polyamide resin, polyether polyamide resin, or Preferably, it is made of polyolefin resin. In this case, the melting point of the resin forming the second inner layer 17B is preferably lower than the melting point or decomposition point of the resin forming the first inner layer 17A. Note that the resin constituting the first inner layer 17A may be a thermoplastic resin or a thermosetting resin, and in the former case, the resin has a melting point, and in the latter case, the resin has a decomposition point. It happens.

The second inner layer 17B may have a larger coefficient of static friction than the first inner layer 17A. Thereby, the adhesiveness between the first tube 3 and the second tube 4 can be improved. In this case, the second inner layer 17B may be made of a resin having a larger coefficient of static friction than the first inner layer 17A, and the second inner layer 17B may be formed by surface roughening treatment (for example, sanding, etching, blasting, etc.). The coefficient of static friction may be large. When increasing the static friction coefficient of the second inner layer 17B by surface roughening treatment, the resin forming the first inner layer 17A and the resin forming the second inner layer 17B may be the same or different.

It is preferable that the outer layer 18 of the first tube 3 is made of resin. The type of resin constituting the outer layer 18 of the first tube 3 is not particularly limited, but may be polyester resin, polyamide resin, polyether polyamide resin, polyolefin resin, aromatic polyether ketone resin, polyimide resin, polyamideimide resin, or polyurethane resin. It is preferable to consist of: This allows the outer layer 18 and the second inner layer 17B to be firmly joined by adhesion or welding, making it easier to improve the integrity of the entire first tube 3 including the reinforcing layer 19. It is also preferable that the outer layer 18 is made of the same resin as the second inner layer 17B, so that the outer layer 18 and the second inner layer 17B can be bonded more firmly.

When the second tube 4 is inserted into the first tube 3 at the tube overlapping portion 8, the second tube 4 has an inner layer, an outer layer, and a reinforcing layer disposed between them. The outer layer is preferably composed of polyester resin, polyamide resin, polyether polyamide resin, polyolefin resin, aromatic polyether ketone resin, polyimide resin, polyamideimide resin, or polyurethane resin. This makes it easy to join the first tube 3 and the second tube 4 by adhesion or welding. It is also preferable that the outer layer of the second tube 4 is made of the same resin as the second inner layer 17B of the first tube 3, so that the first tube 3 and the second tube 4 can be joined more firmly.

It is preferable that the inner layer of the second tube 4 is made of resin. The type of resin constituting the inner layer of the second tube 4 is not particularly limited, and examples include polyester resin, polyamide resin, polyolefin resin, aromatic polyetherketone resin, polyimide resin, polyamideimide resin, fluorine resin, or polyurethane resin. It can be composed of

An example of the structure of the shaft portion 2 having the first tube 3 and the second tube 4 will be described with reference to FIGS. 10 to 12. Note that the configuration of the shaft portion 2 is not limited to the configuration example shown in the drawings.

The shaft part 2 shown in FIG. It has an inner tube 5. A medical tubular body 10 is disposed at the distal portion of the shaft portion 2 between the first tube 3 and the inner tube 5.

The inner tube 5 extends from the distal portion to the proximal portion of the shaft portion 2, providing an over-the-wire delivery device. The first tube 3 is arranged at the distal part of the shaft part 2. The second tube 4 connected to the proximal portion of the first tube 3 extends more proximally than the proximal end of the first tube 3 and extends to the proximal portion of the shaft portion 2 . The inner tube 5 extends more proximally than the proximal end of the second tube 4. A tip 7 is provided at the distal end of the inner tube 5, and a stopper 6 is provided on the outer surface of the inner tube 5 on the proximal side of the medical tubular body 10. The first tube 3 and the second tube 4 are slidable relative to the inner tube 5 in the longitudinal direction. In the conveying device equipped with the shaft portion 2 shown in FIG. 10, by pulling the second tube 4 proximally, the first tube 3 moves proximally, and the medical tubular body 10 is transferred to the shaft portion 2. The medical tubular body 10 can be left in the body.

The shaft portion 2 shown in FIG. 11 is arranged in a first tube 3, a second tube 4 connected to the proximal portion of the first tube 3, and an inner lumen of the first tube 3 and an inner lumen of the second tube 4. It has a protective tube 20 arranged on the outside of the second tube 4 and the inner tube 5 . A medical tubular body 10 is disposed at the distal portion of the shaft portion 2 between the first tube 3 and the inner tube 5.

The inner tube 5 extends from the distal portion to the proximal portion of the shaft portion 2, providing an over-the-wire delivery device. The first tube 3 is arranged at the distal part of the shaft part 2. The second tube 4 connected to the proximal portion of the first tube 3 extends proximally from the proximal end of the first tube 3 and extends to the proximal portion of the shaft portion 2 . The inner tube 5 extends more proximally than the proximal end of the second tube 4. The protective tube 20 is provided so as to cover a part of the second tube 4, and the second tube 4 extends distally from the distal end of the protective tube 20 and extends closer to the proximal end of the protective tube 20. It extends to the side. A tip 7 is provided at the distal end of the inner tube 5, and a stopper 6 is provided on the outer surface of the inner tube 5 on the proximal side of the medical tubular body 10. The first tube 3 and the second tube 4 are slidable in the longitudinal direction with respect to the protective tube 20 and the inner tube 5. In the transport device equipped with the shaft portion 2 shown in FIG. 11, by pulling the second tube 4 proximally, the first tube 3 moves proximally, and the medical tubular body 10 is moved to the shaft portion 2. The medical tubular body 10 can be left in the body.

The shaft portion 2 shown in FIG. A protective tube 20 extending proximally from the end, an inner tube 5 disposed in the inner lumen of the first tube 3, the inner lumen of the second tube 4, and the inner lumen of the protective tube 20, and the inner tube 5 of the second tube 4. It has a linear traction member 21 attached to the proximal part and placed in the lumen of the protective tube 20. A medical tubular body 10 is disposed at the distal portion of the shaft portion 2 between the first tube 3 and the inner tube 5.

The inner tube 5 extends halfway from the distal part to the proximal part of the shaft part 2, providing a rapid exchange type conveyance device. Note that by configuring the inner tube 5 to extend from the distal portion to the proximal portion of the shaft portion 2, an over-the-wire type conveying device may be provided. The first tube 3 is arranged at the distal part of the shaft part 2. The second tube 4 connected to the proximal portion of the first tube 3 extends proximally from the proximal end of the first tube 3 and extends halfway to the proximal portion of the shaft portion 2. . The linear traction member 21 attached to the proximal portion of the second tube 4 extends proximally from the proximal end of the second tube 4 and extends to the proximal portion of the shaft portion 2 . The protective tube 20 is provided so as to cover a part of the second tube 4 and a part of the linear traction member 21, and the linear traction member 21 extends proximally from the proximal end of the protection tube 20. There is. A tip 7 is provided at the distal end of the inner tube 5, and a stopper 6 is provided on the outer surface of the inner tube 5 on the proximal side of the medical tubular body 10. The first tube 3 and the second tube 4 are slidable in the longitudinal direction with respect to the protective tube 20 and the inner tube 5. The linear traction member 21 is not fixed to the protective tube 20. In the conveying device equipped with the shaft portion 2 shown in FIG. 12, by pulling the linear traction member 21 proximally, the first tube 3 and the second tube 4 are moved proximally, and the first tube 3 and the second tube 4 are moved proximally. The body 10 is exposed outside the shaft portion 2, and the medical tubular body 10 can be left in the body.

The shaft portion 2 shown in FIGS. 11 and 12 is covered with the protective tube 20 of the second tube 4 when the second tube 4 is pulled proximally when the medical tubular body 10 is placed in the body. A portion of the remaining portion is accommodated in the inner lumen of the protective tube 20. Thereby, when the second tube 4 is pulled proximally, it is possible to reduce the occurrence of frictional resistance due to the second tube 4 coming into contact with the forceps channel or the forceps opening of the endoscope. Therefore, the operating load when pulling the first tube 3 and the second tube 4 toward the proximal side is reduced, and the medical tubular body 10 can be stably expanded. Furthermore, when the first tube 3 and the second tube 4 are pulled proximally, the entire shaft portion 2 can be prevented from moving proximally, and the medical tubular body 10 can be accurately positioned at the desired position. Can be kept in custody.

Regarding the constituent materials of the protective tube 20, refer to the descriptions of the first tube 3 and the second tube 4 above. The linear traction member 21 can be composed of a thread made of a metal wire or a synthetic resin. The linear traction member 21 may be a composite body made of a plurality of materials, for example, a composite body of metal and synthetic resin. The linear traction member 21 may have a configuration in which a metal wire is coated with resin.

This application claims the benefit of priority based on Japanese Patent Application No. 2022-042889 filed on March 17, 2022. The entire contents of the specification of Japanese Patent Application No. 2022-042889 filed on March 17, 2022 are incorporated by reference into this application.

1: Medical tubular body transport device 2: Shaft portion 3: First tube 4: Second tube 5: Inner tube 6: Stopper 7: Tip tip 8: Tube overlapping portion 9: Operation unit 10: Medical tubular body 11: First reinforced section 12: Second reinforced section 13: Non-reinforced section, 13A: First non-reinforced section, 13B: Second non-reinforced section, 13C: Third non-reinforced section, 13D: Fourth non-reinforced section 14: Reinforcement Layer overlap section 15: Joint section 16: Storage section 17: Inner layer, 17A: First inner layer, 17B: Second inner layer 18: Outer layer 19: Reinforcement layer 20: Protective tube 21: Linear traction member

Claims

A device for transporting a medical tubular body into the body,
a first tube extending in the longitudinal direction, having a housing portion in which the medical tubular body is disposed, and having a first reinforcing section comprising a reinforcing layer made of wire;
a second tube extending in the longitudinal direction and having a second reinforcing section including a reinforcing layer made of wire;
A part of one of the first tube and the second tube is inserted into a part of the other, and a part of the one and a part of the other constitute a tube overlapping part, and The first tube extends distally from the distal end of the tube overlapping part, and the second tube extends proximally from the proximal end of the tube overlapping part,
The tube overlapping section has a reinforcing layer overlapping section in which the first reinforcing section and the second reinforcing section are arranged to overlap,
At least one of the first tube and the second tube has a non-reinforced section without the reinforcing layer in the tube overlapping portion, and the first tube and the second tube are joined to each other in the non-reinforced section. is,
The first reinforcing section extends from the reinforcing layer overlapping section to the distal end of the tube overlapping section, and extends further distally than the distal end of the tube overlapping section,
The second reinforcing section is a medical tubular body that extends from the reinforcing layer overlapping section to the proximal end of the tube overlapping section and further proximally than the proximal end of the tube overlapping section. Conveyance device.
The medical tubular body transport device according to claim 1, which satisfies at least one of the following requirements (A) and (B).
(A) In the tube overlap portion, the first tube has the non-reinforced section, and the non-reinforced section includes a first non-reinforced section adjacent to the proximal side of the first reinforced section, and a first non-reinforced section adjacent to the first reinforced section on the proximal side; a second non-reinforced section proximal to the non-reinforced section; the first tube is not joined to the second tube in the first reinforced section and the first non-reinforced section; It is joined to the second tube at a non-reinforced section.
(B) In the tube overlapping portion, the second tube has the non-reinforced section, and the non-reinforced section includes a third non-reinforced section adjacent to the distal side of the second reinforced section, and the third non-reinforced section. a fourth non-reinforced section distal to the non-reinforced section; the second tube is not joined to the first tube in the second reinforced section and the third non-reinforced section; It is joined to the first tube at a non-reinforced section.
The medical tubular body transport device according to claim 1, which satisfies at least one of the following requirements (C) and (D).
(C) In the tube overlapping portion, the first tube has the non-reinforced section, and the first tube is joined to the second tube at the non-reinforced section and the reinforcing layer overlap section.
(D) In the tube overlapping portion, the second tube has the non-reinforced section, and the second tube is joined to the first tube at the non-reinforced section and the reinforcing layer overlap section.
The medical tubular body transport device according to any one of claims 1 to 3, wherein the first tube and the second tube are joined to each other by welding.
The medical tubular body transport device according to any one of claims 1 to 3, wherein the first tube has the non-reinforced section in the tube overlapping portion.
The medical tubular body transport device according to claim 5, wherein the non-reinforced section is provided at the proximal end of the first tube.
The medical tubular body transport device according to claim 5, wherein the inner surface of the first tube is made of the same resin material from the non-reinforced section to at least a portion of the first reinforced section.
The medical tubular body transport device according to any one of claims 1 to 3, wherein the second tube is inserted into the first tube in the tube overlapping portion.
The first tube has an inner layer, an outer layer, and the reinforcing layer disposed between them, and has the non-reinforced section at the tube overlap part,
The inner layer of the first tube includes a first inner layer that extends from the distal end of the first reinforcing section to at least the proximal end of the storage part, and a first inner layer that is provided on the proximal side of the first inner layer, and The medical tubular body transport device according to claim 8, further comprising a second inner layer extending from the first reinforced section to the non-reinforced section.
The first inner layer is made of a fluororesin, a polyolefin resin, a polyimide resin, or a polyamideimide resin,
The medical use according to claim 9, wherein the second inner layer is made of a polyester resin, a polyamide resin, a polyether polyamide resin, a polyolefin resin, an aromatic polyether ketone resin, a polyimide resin, a polyamideimide resin, or a polyurethane resin. Tubular body conveyance device.
The second tube has an inner layer, an outer layer, and the reinforcing layer disposed between them,
9. The outer layer of the second tube is made of polyester resin, polyamide resin, polyether polyamide resin, polyolefin resin, aromatic polyether ketone resin, polyimide resin, polyamideimide resin, or polyurethane resin. Medical tubular body transport device.