Medical tubular body delivery device

Abstract

Provided is a medical tubular body delivery device with which it is possible to stably perform an operation for placing a medical tubular body in the body. This medical tubular body delivery device is provided with: a first tube (3) having a housing section (17) in which a medical tubular body (9) is disposed; and a second tube (4) inserted into the first tube (3) and extending further toward the proximal side than the proximal end of the first tube (3), the first tube (3) having a first section (11) including a distal end and a second section (12) further toward the proximal side than the first section (11), the housing section (17) being provided in the first section (11), the first tube (3) having an inner layer, an outer layer, and a reinforcing layer (10) comprising a wire material disposed therebetween, the reinforcing layer (10) being provided between the inner layer and the outer layer. The reinforcing layer (10) is provided at least in the first section (11), the static friction coefficient of the inner surface of the inner layer in the first section (11) of the first pipe (3) is smaller than the static friction coefficient of the inner surface of the inner layer in the second section (12), and the first pipe (3) is joined to the second pipe (4) in the second section (12).

Description

Technical Field

[0001] The present invention relates to a medical tubular body delivery device which is a device for delivering a medical tubular body such as a stent into a body. Background Art

[0002] Medical tubular bodies represented by stents are medical devices used to treat various diseases caused by stenosis or blockage of the body lumen of the digestive tract such as the bile duct and pancreatic duct, blood vessels such as the iliac artery, etc. The medical tubular bodies include tubular bodies that expand the lesion such as the stenosis or blockage from the inside and are left in the lesion to maintain the inner diameter of the body cavity, or tubular bodies that entangle the thrombus generated in the lesion or around it and remove it to the outside to restore the inner diameter of the body cavity of the lesion.

[0003] As a medical tubular body delivery device, for example, Patent Document 1 discloses a catheter having an outer tube and an inner tube inserted into the outer tube, wherein a stent is housed in the outer tube, wherein the outer tube is composed of a resin tube in which a reinforcement layer composed of reinforcing wires is buried. Patent Document 2 discloses a stent delivery device having an outer sheath, an inner shaft coaxially arranged inside the outer sheath, and a self-expanding stent housed in the outer sheath, wherein the outer sheath is composed of an outer polymer layer, an inner polymer layer, and a wire reinforcement layer located therebetween.

[0004] Patent Document 1: Japanese Patent Application Publication No. 2012-75453

[0005] Patent document 2: Japanese Patent Application Laid-Open No. 11-313893. Summary of the invention

[0006] Various medical tubular body conveying devices have been proposed in the past, but it is desired that the medical tubular body conveying device can stably perform the operation of placing the medical tubular body in the body. The present invention has been made in view of the above situation, and its object is to provide a medical tubular body conveying device that can stably perform the operation of placing the medical tubular body in the body.

[0007] The medical tubular body conveying device of the present invention that can solve the above-mentioned problems is as follows.

[0008] [1] A medical tubular body delivery device is a device having a length direction and delivering a medical tubular body into a body, wherein:

[0009] A first tube extending in the longitudinal direction and having a housing portion for arranging the medical tubular body in the inner cavity; and

[0010] The second tube extends in the longitudinal direction, is inserted into a portion of the first tube in the longitudinal direction including the proximal end, and extends toward the proximal side of the proximal end of the first tube.

[0011] The first tube has a first section including a distal end and a second section closer to the first section in the longitudinal direction, and the housing portion is provided in the first section.

[0012] The first tube comprises an inner layer, an outer layer and a reinforcing layer composed of a wire disposed therebetween, wherein the reinforcing layer is disposed at least in the first section.

[0013] The static friction coefficient of the inner surface of the inner layer in the first section of the first tube is smaller than the static friction coefficient of the inner surface of the inner layer in the second section.

[0014] The first tube is joined to the second tube in the second section.

[0015] [2] The medical tubular conveying device according to [1], wherein:

[0016] The reinforcing layer is provided from the first section to the second section and overlaps with the second tube.

[0017] [3] The medical tubular conveying device according to [2], wherein:

[0018] The first tube includes, in the second section, a reinforced section having the reinforced layer and a non-reinforced section located closer to the side than the reinforced section and not having the reinforced layer.

[0019] The first pipe is joined to the second pipe in both the reinforced section and the non-reinforced section in the second section.

[0020] [4] The medical tubular conveying device according to [2], wherein:

[0021] The first tube includes, in the second section, a reinforced section having the reinforced layer and a non-reinforced section located closer to the side than the reinforced section and not having the reinforced layer.

[0022] The first tube is joined to the second tube in the non-reinforced section in the second section, and is not joined to the second tube in the reinforced section.

[0023] [5] The medical tubular conveying device according to any one of [2] to [4], wherein:

[0024] The second tube has a reinforcement layer made of wire material.

[0025] In the longitudinal direction, the reinforcement layer of the first tube and the reinforcement layer of the second tube are arranged to overlap.

[0026] [6] The medical tubular conveying device according to [5], wherein:

[0027] The second tube comprises: a second reinforced section having the reinforced layer; and a second non-reinforced section located at a distal side of the second reinforced section and not having the reinforced layer.

[0028] The second pipe is joined to the first pipe in both the second reinforced section and the second non-reinforced section.

[0029] [7] The medical tubular conveying device according to [5], wherein:

[0030] The second tube comprises: a second reinforced section having the reinforced layer; and a second non-reinforced section located at a distal side of the second reinforced section and not having the reinforced layer.

[0031] The second tube is joined to the first tube in the second non-reinforced section, and is not joined to the first tube in the second reinforced section.

[0032] [8] The medical tubular conveying device according to any one of [1] to [7], wherein:

[0033] The inner layer in the first section is made of a resin different from that of the inner layer in the second section.

[0034] [9] The medical tubular conveying device according to [8], wherein:

[0035] The inner layer in the first section is made of a fluorine-based resin or a polyolefin resin.

[0036]

[10] The medical tubular conveying device according to any one of [1] to [9], wherein:

[0037] The inner surface of the inner layer in the first section is subjected to surface roughening treatment.

[0038]

[11] The medical tubular conveying device according to any one of [1] to

[10] , wherein:

[0039] The inner surface of the inner layer in the second section is subjected to surface roughening treatment.

[0040] The medical tubular body delivery device of the present invention has a structure in which, when the first tube and the second tube are pulled toward the proximal side to place the medical tubular body in the body, the medical tubular body is not easily caught on the inner surface of the first tube and the reliability of the connection between the first tube and the second tube is high, so that the operation of placing the medical tubular body in the body can be stably performed. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is a schematic overall diagram showing a medical tubular body conveying device according to an embodiment of the present invention.

[0042] Figure 2 express Figure 1 The illustrated example is a configuration example of the distal portion of the shaft of the medical tubular body transport device.

[0043] Figure 3 An example of a cross-sectional view along the longitudinal direction of the first pipe is shown.

[0044] Figure 4 Another example of a cross-sectional view along the length direction of the first tube is shown.

[0045] Figure 5 Indicated in Figure 2 An example of the joining method of the first tube and the second tube in the configuration example of the distal portion of the shaft portion shown.

[0046] Figure 6 Indicated in Figure 2 Another example of the joining method of the first tube and the second tube in the configuration example of the distal portion of the shaft portion shown.

[0047] Figure 7 express Figure 1 Another structural example of the distal portion of the shaft of the medical tubular body transport device is shown.

[0048] Figure 8 express Figure 1 Another structural example of the distal portion of the shaft of the medical tubular body transport device is shown.

[0049] Fig. 9 Indicated in Figure 8 An example of the joining method of the first tube and the second tube in the configuration example of the distal portion of the shaft portion shown.

[0050] Fig.10 Indicated in Figure 8 Another example of the joining method of the first tube and the second tube in the configuration example of the distal portion of the shaft portion shown.

[0051] Fig.11 A configuration example of a shaft portion including a first tube and a second tube is shown.

[0052] Fig.12 A configuration example of a shaft portion including a first tube and a second tube is shown.

[0053] Fig.13 A configuration example of a shaft portion including a first tube and a second tube is shown.

[0054] Description of Reference Numerals

[0055] 1…medical tubular body conveying device; 2…shaft; 3…first tube; 4: second tube; 5…inner tube; 6…stopper; 7…front end tip; 8…operating part; 9…medical tubular body; 10…reinforcement layer (of first tube); 11…first section; 12…second section; 13…reinforcement section; 14…non-reinforcement section; 14A…non-reinforcement section on the distal side; 14B…non-reinforcement section on the proximal side; 15…inner layer; 15A…first inner layer; 15B…second inner layer; 16…outer layer; 17…storage part; 18…reinforcement layer (of second tube); 19…second reinforced section; 20…second non-reinforcement section; 20A…second non-reinforcement section on the proximal side; 20B…second non-reinforcement section on the distal side; 21…tube overlapping part; 22…joining section; 23…reinforcement layer overlapping section; 24…protective tube; 25…linear traction member. DETAILED DESCRIPTION

[0056] The present invention is specifically described below based on the following embodiments, but the present invention is certainly not limited by the following embodiments, and can of course be implemented by appropriately changing within the scope of the subject matter described above, and they are all included in the technical scope of the present invention. In addition, in each of the drawings, for convenience, there are also cases where hatching, component reference numerals, etc. are omitted, but in this case, refer to the specification and other drawings. In addition, the sizes of various components in the drawings are preferentially helpful for understanding the features of the present invention, so there are cases where they are different from the actual sizes.

[0057] Reference Figures 1 to 10 The structure of the medical tubular body conveying device will be described. Figure 1 A schematic overall diagram showing a medical tubular body conveying device according to an embodiment of the present invention, Figure 2 , Figure 7 and Figure 8 express Figure 1 The structure example of the distal part of the shaft of the medical tubular conveying device shown in FIG. Figure 3 and Figure 4 An example of a cross-sectional view along the length direction of the first tube of the shaft portion is shown. Figure 5 , Figure 6 , Fig. 9 and Fig.10 An example of how the first tube and the second tube in the distal portion of the shaft are joined is shown.

[0058] The medical tubular body delivery device 1 is a medical device for delivering a medical tubular body 9 into the body. The medical tubular body delivery device 1 is a long strip-shaped device having a shaft portion 2, and the medical tubular body 9 is arranged in the inner cavity of the shaft portion 2. By using the medical tubular body 9, various diseases caused by stenosis or blockage of the lumen in the body such as the bile duct, the digestive tract, and blood vessels can be treated. The length of the shaft portion 2 in the longitudinal direction can be, for example, about 300 mm to 3000 mm. In addition, in the following description, the medical tubular body delivery device is sometimes referred to as a "delivery device".

[0059] The conveying device 1 has a length direction. The length direction of the conveying device 1 corresponds to the extension direction of the shaft portion 2, and the proximal side and the distal side are defined relative to the length direction. In the conveying device 1, the proximal side refers to the front side of the user, and the distal side refers to the opposite direction of the proximal side, that is, the direction of the treatment object side. In each of the drawings, the right side of the drawing corresponds to the proximal side, and the left side of the drawing corresponds to the distal side.

[0060] In the case of endoscopic treatment, the shaft 2 is inserted from the forceps port of the endoscope into the forceps channel and delivered to the lesion. An operating portion 8 is preferably provided on the proximal side of the shaft 2. By operating the operating portion 8, the medical tubular body 9 can be exposed to the outside of the shaft 2 in the patient's body and the medical tubular body 9 can be left in the body.

[0061] like Figure 2 As shown, the shaft portion 2 has a first tube 3 and a second tube 4. The first tube 3 and the second tube 4 extend in the length direction respectively and are joined to each other. The second tube 4 is inserted into a portion in the length direction including the proximal end of the first tube 3, and extends to the proximal side than the proximal end of the first tube 3. In the portion where the second tube 4 is inserted into the first tube 3, the outer surface of the second tube 4 is joined to the inner surface of the first tube 3. Hereinafter, in the shaft portion 2, the portion where the first tube 3 and the second tube 4 overlap, that is, the portion where the second tube 4 is inserted into the first tube 3 is referred to as a tube overlapping portion 21. In addition, in Figure 2 and the following Figures 5 to 10 In the figure, for easy understanding, the portion of the second tube 4 inserted into the first tube 3 is indicated by a solid line rather than a dotted line.

[0062] The medical tubular body 9 is arranged in the inner cavity of the first tube 3. The first tube 3 has a storage portion 17 for arranging the medical tubular body 9 in the inner cavity. The first tube 3 is arranged at the distal portion of the shaft portion 2. The length of the first tube 3 in the longitudinal direction can be appropriately set according to the length of the medical tubular body 9 arranged in the inner cavity, and is longer than the length of the medical tubular body 9 arranged in the inner cavity of the first tube 3, and can be set to about 20 mm to 800 mm, for example. The outer diameter of the first tube 3 can be set to about 0.5 mm to 3.5 mm, for example, and the inner diameter of the first tube 3 can be set to about 0.3 mm to 3.4 mm, for example.

[0063] The second tube 4 extends proximally from 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 not extend to the proximal portion of the shaft portion 2 but extend to the middle of the proximal portion of the shaft portion 2. It is preferred that the distal end of the second tube 4 is located closer to the proximal side than the proximal end of the housing portion 17 of the first tube 3. 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.

[0064] A stent is a typical example of the medical tubular body 9. The medical tubular body 9 includes a spiral medical tubular body formed of a single linear metal or polymer material, a medical tubular body formed by shearing a metal tube or a tube made of a polymer material by laser or the like, a medical tubular body assembled by welding linear parts, a medical tubular body formed by braiding a plurality of linear metals, etc. In addition to the stent, the medical tubular body 9 also includes a stent graft, an occluder, an infusion catheter, an artificial valve, etc.

[0065] From the perspective of the expansion mechanism, the medical tubular body 9 can be classified into: (i) a balloon-expandable medical tubular body, which is installed (fixed) on the surface of a balloon to be delivered to the lesion, and the medical tubular body is expanded by the balloon at the lesion; and (ii) a self-expandable medical tubular body, which is delivered to the lesion in a state where the expansion is suppressed, and expands itself by removing the component that suppresses the expansion at the lesion. The delivery device 1 is suitable for delivering a self-expandable medical tubular body, and the first tube 3 functions as a component that suppresses the expansion of the medical tubular body 9. The medical tubular body 9 is reduced in the radial direction and extended in the length direction when it is arranged in the inner cavity of the first tube 3, thereby becoming a cylindrical shape that is thinner and longer than the expanded state, that is, a reduced diameter state. After the medical tubular body 9 is delivered to the lesion, the first tube 3 and the second tube 4 are slid toward the proximal side relative to the medical tubular body 9, thereby exposing the medical tubular body 9 to the outside of the shaft 2, and the medical tubular body 9 is expanded in the radial direction and is placed in the body.

[0066] The shaft portion 2 preferably includes a first tube 3 and a second tube 4 as outer tubes, and an inner tube 5 is disposed in the inner lumens of the first tube 3 and the second tube 4. The medical tubular body 9 is preferably disposed between the first tube 3 and the inner tube 5 when the medical tubular body 9 is mounted on the conveying device 1. The first tube 3 and the second tube 4 are provided so as to be slidable in the length direction relative to the inner tube 5. Thus, the medical tubular body 9 can be stably held in the inner lumen of the first tube 3, and when the medical tubular body 9 is indwelled in the body, it is easy to stably perform an operation of pulling the first tube 3 and the second tube 4 toward the proximal side to expose the medical tubular body 9.

[0067] The inner tube 5 is preferably arranged at the distal part of the shaft 2, for example, and may extend from the distal part to the proximal part of the shaft 2. The inner cavity of the inner tube 5 can function as an insertion passage for the guide wire. In the case of an OTW (Over-The-Wire) type delivery device, the inner tube 5 preferably extends from the distal part of the shaft 2 to the proximal part of the shaft 2, and in the case of an RX (Rapid Exchange) type delivery device, the inner tube 5 preferably extends from the distal part of the shaft 2 to the middle of the proximal part of the shaft 2, and does not extend to the proximal part of the shaft 2.

[0068] It is preferred that each tube such as the first tube 3, the second tube 4, and the inner tube 5 is made of resin. Examples of the resin constituting the tube include polyester resins such as polyethylene terephthalate and polybutylene 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, polyimide resins, polyamide-imide resins, fluororesins such as PTFE, PFA, and ETFE, polyvinyl chloride resins, and synthetic resins such as silicone resins. The tube may also have a reinforcement layer made of a wire, and the reinforcement layer will be described later.

[0069] It is preferred that a stopper 6 is provided on the inner tube 5, on the proximal side of the medical tubular body 9. The stopper 6 is mounted on the outer surface of the inner tube 5. It is preferred that the stopper 6 is arranged to abut against the proximal end of the medical tubular body 9, or to be arranged near the proximal end of the medical tubular body 9. For example, the portion of the stopper 6 abutting against the proximal end of the medical tubular body 9 is arranged to be located within 10 mm from the proximal end of the medical tubular body 9 to the proximal side. By providing the stopper 6 on the proximal side of the medical tubular body 9, when the first tube 3 and the second tube 4 are pulled to the proximal side, the medical tubular body 9 can be prevented from being pulled to the proximal side together with the first tube 3, and the medical tubular body 9 can be easily exposed to the outside of the shaft portion 2.

[0070] The shape of the stopper 6 can be set to be annular, for example. Preferably, the outer diameter of the stopper 6 is less than the inner diameter of the first tube 3 and greater than the inner diameter of the medical tubular body 9 arranged in the inner cavity of the first tube 3. The stopper 6 can be composed of resin, metal or a composite material thereof. Among them, the stopper 6 is preferably composed of an elastomeric resin, thereby preventing the medical tubular body 9 from being deformed or damaged when the stopper 6 contacts the medical tubular body 9. As the elastomeric resin, polyamide resin is preferably used. Thereby, the rigidity of the stopper 6 can be improved, and the proximal end of the medical tubular body 9 can be supported by the stopper 6, so that the medical tubular body 9 can be effectively unfolded.

[0071] It is preferred that a tip 7 is provided at the distal end of the inner tube 5. It is preferred that the tip 7 has an inner cavity, which is communicated with the inner cavity of the inner tube 5. The tip 7 constitutes the distal end of the shaft 2, and thus, when the shaft 2 is inserted into the forceps channel of the endoscope to deliver the medical tubular body 9 to the lesion, it is possible to prevent the tip of the shaft 2 from damaging the lumen in the body. In addition, the followability of the shaft 2 to the preceding guide wire and forceps channel and the delivery performance of the tip of the shaft 2 to the lesion can be improved, and the operability of the delivery device 1 is improved.

[0072] Preferably, the front end tip 7 is made of an elastomer resin. As the elastomer resin, polyurethane resin, polyester resin, polyamide resin, etc. are preferably enumerated, and it is particularly preferably made of polyamide resin. By constituting the front end tip 7 like this, the followability of the front end tip 7 to the guide wire and the safety of the front end of the shaft portion 2 can be improved.

[0073] An X-ray opaque mark may also be provided on the shaft portion 2. By providing the X-ray opaque mark 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 mark as a mark. The X-ray opaque mark is preferably provided near the portion of the shaft portion 2 where the medical tubular body 9 is provided, preferably provided at the front end tip 7, the stopper 6, and the first tube 3. By providing the X-ray opaque mark at the front end tip 7, the position of the distal end of the shaft portion 2 can be determined under X-ray fluoroscopy. In addition, by providing the X-ray opaque mark at the stopper 6, the position and the push-out state of the medical tubular body 9 can be confirmed under X-ray fluoroscopy. When the X-ray opaque mark is provided on the first tube 3, the timing of the medical tubular body 9 emerging from the first tube 3 can be grasped under X-ray fluoroscopy. The number of X-ray opaque marks provided may be one or more.

[0074] The structures of the first tube 3 and the second tube 4 are described in detail. The first tube 3 has a reinforcement layer 10 made of a wire. Since the first tube 3 has the reinforcement layer 10, the rigidity and kink resistance of the first tube 3 are improved. In the first tube 3, the section where the reinforcement layer 10 is provided is called a reinforcement section 13. The first tube 3 may be provided with the reinforcement layer 10 throughout the entire length direction, or may have a non-reinforced section 14 without the reinforcement layer 10. In the first tube 3, the reinforcement section 13 and the non-reinforced section 14 are divided in the length direction, and the section where the wire of the reinforcement layer 10 exists in at least a part of the circumference of the first tube 3 is the reinforcement section 13, and the section where the wire of the reinforcement layer 10 does not exist in the circumference of the first tube 3 is the non-reinforced section 14.

[0075] As the wire material constituting the reinforcing layer 10, metal wires, fibers, etc. can be cited. As the material constituting the metal wire, for example, stainless steel such as SUS304 and SUS316, carbon steel, platinum, nickel, cobalt, chromium, titanium, tungsten, gold, nickel-titanium alloy, cobalt-chromium alloy, tungsten alloy, etc. can be cited, among which stainless steel is preferred. The metal wire can be a single wire or a twisted wire. As the fiber, for example, polyarylate fiber, aramid fiber, ultra-high molecular weight polyethylene fiber, PBO fiber, carbon fiber, etc. can be cited. The fiber can be a monofilament or a multifilament.

[0076] The arrangement pattern of the wires in the reinforcing layer 10 is not particularly limited, and examples thereof include spiral, mesh, braided, etc. Among them, the wires of the reinforcing layer 10 are preferably arranged in a braided pattern because the reinforcing layer 10 can effectively increase the rigidity of the first tube 3 .

[0077] In the reinforcement section 13 of the first tube 3, the reinforcement layer 10 is arranged between the inner layer 15 and the outer layer 16 (see Figure 3 and Figure 4 ). This can improve the sliding properties of the inner surface and the outer surface of the first tube 3. It is preferable that the inner layer 15 and the outer layer 16 are resin layers composed of resin.

[0078] The first tube 3 has a first section 11 including the distal end of the first tube 3 and a second section 12 on the proximal side of the first section 11 in the longitudinal direction. For the first tube 3, the static friction coefficient of the inner layer 15 of the first section 11 is smaller than the static friction coefficient of the inner layer 15 of the second section 12, the reinforcing layer 10 is provided at least in the first section 11, the storage portion 17 is provided in the first section 11, and the first tube 3 and the second tube 4 are joined in the second section 12. By configuring the first tube 3 in this way, it is easy to stably perform the operation of pulling the first tube 3 and the second tube 4 toward the proximal side to place the medical tubular body 9 in the body.

[0079] To explain this in detail, in the first section 11 including the distal end, the static friction coefficient of the inner surface of the inner layer 15 of the first tube 3 is formed to be small, and the reinforcing layer 10 is provided in the first section 11. In addition, the housing portion 17 is provided in the first section 11. Since the static friction coefficient of the inner surface of the inner layer 15 of the first tube 3 is formed to be small in the first section 11, the sliding property of the inner surface of the first tube 3 is improved, and when the first tube 3 is pulled toward the proximal side to unfold the medical tubular body 9 arranged in the housing portion 17, the medical tubular body 9 is not easily caught on the inner surface of the first tube 3. In addition, since the reinforcing layer 10 is provided in the first section 11 of the first tube 3, the inner cavity of the first tube 3 is not easily deformed when the first tube 3 is pulled toward the proximal side, and from this point of view, the medical tubular body 9 is not easily caught on the inner surface of the first tube 3. Therefore, the first tube 3 can be smoothly pulled toward the proximal side, and the operation of placing the medical tubular body 9 in the body can be easily performed. Furthermore, by providing the reinforcing layer 10 in the first section 11 of the first tube 3, the breaking strength of the first section 11 is improved, and the first tube 3 is not easily broken when the first tube 3 is pulled toward the proximal side, and the first tube 3 can be stably pulled toward the proximal side. On the other hand, in the first tube 3, in the second section 12 located closer to the proximal side than the first section 11, the static friction coefficient of the inner surface of the inner layer 15 is formed to be large, and the first tube 3 and the second tube 4 are joined in the second section 12. As a result, the reliability of the joining between the first tube 3 and the second tube 4 is improved, and combined with the fact that the medical tubular body 9 is not easily hooked on the inner surface of the first tube 3 as described above, the first tube 3 and the second tube 4 can be stably pulled toward the proximal side.

[0080] The static friction coefficient of the inner surface of the first section 11 and the second section 12 of the first tube 3 can be obtained based on JIS K7125: 1999. For example, a slit is formed in the first tube 3 along the longitudinal direction, and the first tube 3 is unfolded into a flat shape, thereby measuring the static friction coefficient of the inner surface of the first tube 3. When the inner layer 15 of the first tube 3 is smoothly formed in the first section 11 and the second section 12, a known value of the static friction coefficient of the resin constituting the first section 11 and the second section 12 can also be used.

[0081] As a method for making the static friction coefficient of the inner surface of the inner layer 15 of the first tube 3 in the first section 11 smaller than that in the second section 12, Figure 3 As shown, the inner layer 15 of the first section 11 of the first tube 3 may also be made of a resin different from the inner layer 15 of the second section 12. Figure 3, an example of a cross-sectional view along the length direction of the first tube 3 is shown, and the inner layer 15 of the first tube 3 includes a first inner layer 15A provided in the first section 11, and a second inner layer 15B provided in the second section 12, and the first inner layer 15A and the second inner layer 15B are composed of different resins. In this case, it is preferred that the first inner layer 15A in the first section 11 is composed of a resin having a smaller static friction coefficient than the second inner layer 15B in the second section 12. Examples of resins having a small static friction coefficient include fluororesins such as PTFE, PFA, and ETFE, and polyolefin resins such as polyethylene and polypropylene. By forming the first inner layer 15A with such a resin, the static friction coefficient of the inner surface of the inner layer 15 in the first section 11 of the first tube 3 can be reduced. The second inner layer 15B of the second section 12 can be made of, for example, polyester resin such as polyethylene terephthalate and polybutylene terephthalate, polyamide resin such as nylon, aromatic polyether ketone resin such as PEEK, polyurethane resin, polyether polyamide resin, polyimide resin, polyamide-imide resin, etc.

[0082] like Figure 4 As shown, the inner surface of the inner layer 15 in the first section 11 of the first tube 3 may also be roughened. Figure 4 , another example of a cross-sectional view along the length direction of the first tube 3 is shown, in which the inner surface of the inner layer 15 of the first tube 3 is subjected to surface roughening treatment in the first section 11. By subjecting the inner surface of the inner layer 15 to surface roughening treatment in the first section 11, fine concavoconvexities are formed on the inner surface of the inner layer 15 in the first section 11, and the contact area between the outer surface of the medical tubular body 9 and the inner surface of the first section 11 is reduced, so that the sliding property of the inner surface of the inner layer 15 in the first section 11 can be improved. As surface roughening treatment, filing, etching, sandblasting, etc. can be cited. Even in this case, the static friction coefficient of the inner surface of the inner layer 15 of the first tube 3 can be formed so that the first section 11 is smaller than the second section 12. In this case, the inner layer 15 of the first section 11 and the inner layer 15 of the second section 12 can be composed of the same resin or different resins.

[0083] Although not shown in the drawings, the inner surface of the inner layer 15 may be subjected to surface roughening treatment in the second section 12 of the first tube 3. In this case, the inner surface of the inner layer 15 in the second section 12 of the first tube 3 is subjected to surface roughening treatment, so that the static friction coefficient of the inner surface of the inner layer 15 of the first tube 3 in the first section 11 is smaller than that in the second section 12. The inner surface of the inner layer 15 is subjected to surface roughening treatment in the second section 12, so that large irregularities are formed on the inner surface of the inner layer 15 in the second section 12. Thus, when the first tube 3 and the second tube 4 are bonded together by an adhesive, the adhesive is easily retained on the inner surface of the inner layer 15 in the second section 12 of the first tube 3, and the bonding force between the first tube 3 and the second tube 4 is easily improved. In addition, when manufacturing the conveying device 1, it is easy to insert the second tube 4 into the first tube 3, and it is easy to bond the first tube 3 and the second tube 4 at a desired and accurate position.

[0084] In the first tube 3, the first section 11 is preferably formed to include the entire length direction of the storage section 17. Therefore, it is preferred that the first section 11 extends at least from the distal end of the first tube 3 to the proximal end of the storage section 17. The first section 11 may also extend to the proximal side than the proximal end of the storage section 17. Although the first section 11 may also extend to the tube overlap section 21, from the viewpoint of ensuring the joining force between the first tube 3 and the second tube 4, it is preferred that the first section 11 does not extend to the tube overlap section 21, and the proximal end of the first section 11 is preferably located at a position on the distal side of the distal end of the tube overlap section 21 (or the second tube 4).

[0085] In the first tube 3, the second section 12 only needs to be formed in at least a portion of the tube overlap portion 21, and is preferably formed over the entire length direction of the tube overlap portion 21. That is, it is preferred that the second section 12 extends at least from the proximal end of the first tube 3 to the distal end of the tube overlap portion 21 (or the second tube 4). The second section 12 may also extend to the distal side than the distal end of the tube overlap portion 21 (or the second tube 4).

[0086] In the first tube 3, the reinforcing layer 10 is preferably provided at least from the distal end to the proximal end of the housing portion 17, and more preferably at least from the distal portion of the first tube 3 to the proximal end of the housing portion 17. Thus, when the first tube 3 is pulled toward the proximal side to unfold the medical tubular body 9 disposed in the housing portion 17, the medical tubular body 9 is less likely to be caught on the inner surface of the first tube 3. The distal end of the reinforcing layer 10 is preferably located on the distal side than the distal end of the housing portion 17, and is located within a range of 20 mm from the distal end of the first tube 3 to the proximal side, more preferably within a range of 15 mm, and further preferably within a range of 10 mm.

[0087] The reinforcing layer 10 is preferably provided from the first section 11 to the second section 12, more preferably provided from the first section 11 to the second section 12, and overlaps with the second tube 4. That is, the reinforcing layer 10 is more preferably provided from the first section 11 to the tube overlapping portion 21. By providing the reinforcing layer 10 in this way, when the first tube 3 is pulled toward the proximal side to unfold the medical tubular body 9, the inner layer 15 of the first tube 3 is less likely to be broken at the boundary between the first section 11 and the second section 12. In addition, the first tube 3 is less likely to be bent at the boundary between the first section 11 and the second section 12 and the distal end of the tube overlapping portion 21, and the pushability when the shaft portion 2 is inserted into the forceps channel of the endoscope can be improved.

[0088] The reinforcing layer 10 is preferably provided from the distal portion of the first tube 3 to the tube overlapping portion 21. By providing the reinforcing layer 10 in this way, the first tube 3 is not easily deformed in the entire length direction, and the operation of pulling the first tube 3 to the proximal side to place the medical tubular body 9 in the body is easy and stable. The first tube 3 does not overlap with the second tube 4 on the distal side of the tube overlapping portion 21, and is more easily deformed than the tube overlapping portion 21, but by providing the reinforcing layer 10 in this way, the first tube 3 is also less likely to deform in the portion on the distal side of the tube overlapping portion 21.

[0089] The first tube 3 preferably has a non-reinforced section 14 on the proximal side of the reinforced section 13, and the non-reinforced section 14 does not have a reinforcing layer 10. The reinforced section 13 preferably extends from the first section 11 to the second section 12, and the reinforced section 13 and the non-reinforced section 14 are provided in the second section 12. On this basis, it is preferred that the first tube 3 is joined to the second tube 4 in the non-reinforced section 14. By joining the first tube 3 to the second tube 4 in the non-reinforced section 14, the joining force between the first tube 3 and the second tube 4 can be improved. To explain this in detail, the reinforced section 13 of the first tube 3 has a higher rigidity by having a reinforcing layer 10, but on the other hand, the flexibility is poor. Therefore, when the first tube 3 is joined to the second tube 4 in the reinforced section 13, there is a concern that the joining force between the first tube 3 and the second tube 4 is insufficient. In this case, when the second tube 4 is pulled to the proximal side, there is a concern that the joining between the first tube 3 and the second tube 4 is disengaged in the middle of the pulling. However, the joining force between the first tube 3 and the second tube 4 can be improved by joining the first tube 3 to the second tube 4 in the non-reinforced section 14. That is, the first tube 3 is formed to be flexible in the non-reinforced section 14, so that the followability of the first tube 3 to the second tube 4 is improved in the non-reinforced section 14, thereby stably maintaining the joining between the first tube 3 and the second tube 4, and improving the reliability of the joining between the first tube 3 and the second tube 4.

[0090] It is preferred that the first tube 3 is joined to the second tube 4 in the non-reinforced section 14, and the reinforcing layer 10 is provided from the first section 11 to the second section 12, overlapping the second tube 4. That is, it is preferred that the reinforcing section 13 extends from the first section 11 to the second section 12, and extends to the tube overlapping portion 21. Thus, the first tube 3 is unlikely to bend or deform significantly at the distal end of the tube overlapping portion 21, and combined with the first tube 3 being joined to the second tube 4 in the non-reinforced section 14, the reliability of the joining of the first tube 3 and the second tube 4 can be further improved.

[0091] When the first tube 3 is joined to the second tube 4 in the non-reinforced section 14 , the first tube 3 may be joined to the second tube 4 in the reinforced section 13 , or may not be joined to the second tube 4 . Figure 5 2 shows an example in which the first pipe 3 is joined to the second pipe 4 in both the reinforced section 13 and the non-reinforced section 14 in the second section 12 . Figure 5 express Figure 2 The first tube 3 and the second tube 4 are connected to each other in the example of the distal portion of the shaft portion 2 shown in the figure. The first tube 3 and the second tube 4 are connected to each other in the connection section 22. When the first tube 3 and the second tube 4 are connected in this way, the kink resistance in the tube overlap portion 21 is improved, and the pushability when the shaft portion 2 is inserted into the forceps channel of the endoscope is improved. In addition, when the first tube 3 and the second tube 4 are pulled toward the proximal side, the force of pulling the first tube 3 toward the proximal side is easily transmitted to the second tube 4, and the pulling operation can be stably performed.

[0092] exist Figure 5 In the embodiment, in the tube overlap portion 21, the first tube 3 is joined to the second tube 4 in a part of the reinforced section 13 and a part of the non-reinforced section 14, but may be joined to the second tube 4 in the entire reinforced section 13 of the tube overlap portion 21, or may be joined to the second tube 4 in the entire non-reinforced section 14. Preferably, the first tube 3 is joined to the second tube 4 continuously from the reinforced section 13 to the non-reinforced section 14.

[0093] Figure 6 2 shows an example in which the first tube 3 is joined to the second tube 4 in the non-reinforced section 14 in the second section 12 , and is not joined to the second tube 4 in the reinforced section 13 . Figure 6 express Figure 2Another example of the joining method of the first tube 3 and the second tube 4 in the configuration example of the distal portion of the shaft portion 2 shown in the figure is that the first tube 3 and the second tube 4 are joined to each other in the joining section 22. In this case, it is preferable that the non-reinforced section 14 has a distal non-reinforced section 14A adjacent to the proximal side of the reinforced section 13 and a proximal non-reinforced section 14B closer to the distal non-reinforced section 14A, and the first tube 3 is not joined to the second tube 4 in the reinforced section 13 and the distal non-reinforced section 14A, and is joined to the second tube 4 in the proximal non-reinforced section 14B to form the joining section 22. When the first tube 3 and the second tube 4 are joined in this way, when an excessive load is applied to the first tube 3 and the second tube 4 when the medical tubular body 9 is placed indwelling in the body, it is possible to prevent the medical tubular body 9 from being deviated from the intended position and causing the medical tubular body 9 to be deployed, or to prevent the body tissue from being damaged by the medical tubular body 9 and the shaft portion 2. That is, when the first tube 3 and the second tube 4 are pulled toward the proximal side, if the inner surface of the first tube 3 is hooked on the medical tubular body 9, an excessive load is applied to the first tube 3 and the second tube 4. At this time, if the first tube 3 and the second tube 4 are forcibly pulled toward the proximal side, the entire shaft portion 2 is pulled toward the proximal side, and there is a concern that the medical tubular body 9 may be deployed due to deviation from the expected position, or the accumulated force may be released all at once, causing the medical tubular body 9 and the shaft portion 2 to damage the body 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 and the second tube 4, the first tube 3 is easily broken in the distal non-reinforced section 14A, and the medical tubular body 9 can be prevented from being deployed in a state where an excessive force is applied. Therefore, it is possible to prevent the medical tubular body 9 from being deployed due to deviation from the expected position, or the medical tubular body 9 and the shaft portion 2 from damaging the body tissue.

[0094] exist Figure 6 In the figure, the proximal non-reinforced interval 14B (joining interval 22) extends to the proximal end of the first tube 3, but the proximal non-reinforced interval 14B (joining interval 22) may not extend to the proximal end of the first tube 3, and the first tube 3 may not be joined to the second tube 4 at a side closer to the proximal non-reinforced interval 14B.

[0095] like Figure 7 and Figure 8 As shown, the second tube 4 preferably has a reinforcement layer 18 made of wire material. Figure 7 It is shown in Figure 2 The shaft portion 2 shown is an example in which a reinforcement layer 18 is provided on the second tube 4 . Figure 8 It is shown in Figure 2 In the shaft portion 2 shown in the figure, the first tube 3 is not provided with a non-reinforced section 14, but a reinforcement layer 18 is provided on the second tube 4. The second tube 4 has the reinforcement layer 18, so that the rigidity and kink resistance of the second tube 4 are improved. In the second tube 4, the section provided with the reinforcement layer 18 is referred to as the second reinforcement section 19. Figure 8 As shown, the second tube 4 may have a second non-reinforced section 20 in addition to the second reinforced section 19, and the second non-reinforced section 20 does not have the reinforcing layer 18. In the second tube 4, the second reinforced section 19 and the second non-reinforced section 20 are divided in the length direction, and the section where the wire material of the reinforcing layer 18 exists in at least a part of the circumference of the second tube 4 becomes the second reinforced section 19, and the section where the wire material of the reinforcing layer 18 does not exist in the circumference of the second tube 4 becomes the second non-reinforced section 20. The description of the reinforcing layer 18 of the second tube 4 refers to the description of the reinforcing layer 10 of the first tube 3 mentioned above. In the second tube 4, it is preferred that the reinforcing layer 18 is arranged between the inner layer and the outer layer. It is preferred that the inner layer and the outer layer are resin layers composed of resin.

[0096] It is preferred that the reinforcing layer 18 of the second tube 4 is arranged to overlap with the reinforcing layer 10 of the first tube 3 in the longitudinal direction of the shaft portion 2. In addition, in the shaft portion 2, the section where the reinforcing layer 10 of the first tube 3 and the reinforcing layer 18 of the second tube 4 are arranged to overlap is referred to as the reinforcing layer overlapping section 23. By configuring the shaft portion 2 in this way, the rigidity of the shaft portion 2 from the first tube 3 to the second tube 4 is improved, the pushing property when the shaft portion 2 is inserted into the forceps channel of the endoscope is improved, and the kink resistance is improved. When the first tube 3 and the second tube 4 are pulled toward the proximal side in order to indwell the medical tubular body 9 in the body, the first tube 3 and the second tube 4 are not easily stretched, and the breaking strength of the first tube 3 and the second tube 4 is also improved, so that the pulling operation can be stably performed. In this case, it is preferred that the reinforcement interval 13 of the first tube 3 extends from the reinforcement layer overlapping interval 23 to the distal end of the tube overlapping portion 21, and extends toward the distal side than the distal end of the tube overlapping portion 21, and the second reinforcement interval 19 of the second tube 4 extends from the reinforcement layer overlapping interval 23 to the proximal end of the tube overlapping portion 21, and extends toward the proximal side than the proximal end of the tube overlapping portion 21.

[0097] exist Figure 7 In the example of the structure of the shaft portion 2 shown in FIG. Figure 5 As shown, the first tube 3 is joined to the second tube 4 in both the reinforced section 13 and the non-reinforced section 14 in the second section 12. Figure 6 As shown, the first tube 3 is joined to the second tube 4 in at least a portion of the non-reinforced section 14 in the second section 12, and is not joined to the second tube 4 in the reinforced section 13. In addition, the first tube 3 may not be joined to the second tube 4 in the reinforced section 13 and the distal non-reinforced section 14A, but may be joined to the second tube 4 in the proximal non-reinforced section 14B. In the first tube 3, the reinforced section 13 may not be provided in the tube overlapping section 21, but may be provided over the entire length direction of the tube overlapping section 21.

[0098] like Figure 8As shown, when the second tube 4 has the second reinforced section 19 and the second non-reinforced section 20, the second non-reinforced section 20 may be provided on the distal side of the second reinforced section 19, and the second tube 4 is joined to the first tube 3 in the second non-reinforced section 20. By joining the first tube 3 and the second tube 4 in this way, the joining force between the first tube 3 and the second tube 4 can be improved. Since the second tube 4 is formed flexibly in the second non-reinforced section 20, the followability of the second tube 4 to the first tube 3 is improved in the second non-reinforced section 20, thereby the joining of the first tube 3 and the second tube 4 is stably maintained, and the reliability of the joining of the first tube 3 and the second tube 4 can be improved.

[0099] When the second tube 4 is joined to the first tube 3 in the second non-reinforced section 20 , the second tube 4 may be joined to the first tube 3 in the second reinforced section 19 , or may not be joined. Fig. 9 2 shows an example in which the second pipe 4 is joined to the first pipe 3 in both the second reinforced section 19 and the second non-reinforced section 20 . Fig. 9 express Figure 8 The example of the joining method of the second tube 4 and the first tube 3 in the configuration example of the distal portion of the shaft portion 2 shown in the figure is that the first tube 3 and the second tube 4 are joined to each other in the joining section 22. When the first tube 3 and the second tube 4 are joined in this way, the kink resistance in the tube overlap portion 21 is improved, and the pushability when the shaft portion 2 is inserted into the forceps channel of the endoscope is improved. In addition, when the first tube 3 and the second tube 4 are pulled toward the proximal side, the force of pulling the first tube 3 toward the proximal side is easily transmitted to the second tube 4, and the pulling operation can be stably performed.

[0100] exist Fig. 9 In the embodiment, in the tube overlap portion 21, the second tube 4 is joined to the first tube 3 in a part of the second reinforced section 19 and a part of the second non-reinforced section 20, but the second tube 4 may be joined to the first tube 3 in the entire second reinforced section 19 of the tube overlap portion 21, or may be joined to the first tube 3 in the entire second non-reinforced section 20. Preferably, the second tube 4 is joined to the first tube 3 continuously from the second reinforced section 19 to the second non-reinforced section 20.

[0101] Fig.10 2 shows an example in which the second tube 4 is joined to the first tube 3 in the second non-reinforced section 20 and is not joined to the first tube 3 in the second reinforced section 19 . Fig.10 express Figure 8In another example of the joining method of the first tube 3 and the second tube 4 in the configuration example of the distal portion of the shaft portion 2 shown, the first tube 3 and the second tube 4 are joined to each other in the joining section 22. In this case, it is preferred that the second non-reinforced section 20 has a proximal second non-reinforced section 20A adjacent to the distal side of the second reinforced section 19 and a distal second non-reinforced section 20B on the distal side of the proximal second non-reinforced section 20A, and the second tube 4 is not joined to the first tube 3 in the second reinforced section 19 and the proximal second non-reinforced section 20A, and is joined to the first tube 3 in the distal second non-reinforced section 20B to form the joining section 22. By joining the first tube 3 and the second tube 4 in this way, when an excessive load is applied to the first tube 3 and the second tube 4 when the medical tubular body 9 is placed indwelling in the body, it is possible to prevent the medical tubular body 9 from being deviated from the intended position and causing the medical tubular body 9 to be deployed, or to prevent the body tissue from being damaged by the medical tubular body 9 and the shaft portion 2. That is, when the first tube 3 and the second tube 4 are pulled toward the proximal side, even if an excessive load is applied to the first tube 3 and the second tube 4, the second tube 4 is easily broken in the proximal second non-reinforced section 20A, and the medical tubular body 9 can be prevented from being deployed under an excessive force. Therefore, it is possible to prevent the medical tubular body 9 from being deployed due to deviation from the intended position, or to prevent the medical tubular body 9 and the shaft portion 2 from damaging the body tissue.

[0102] exist Fig.10 In the embodiment, the distal second non-reinforced section 20B (joining section 22) extends to the distal end of the second tube 4, but the distal second non-reinforced section 20B (joining section 22) may not extend to the distal end of the second tube 4, and the second tube 4 may not be joined to the first tube 3 at a position distal to the distal second non-reinforced section 20B.

[0103] Although not shown in the drawings, the shaft portion 2 may be a structure in which the first tube 3 has a reinforced section 13 and a non-reinforced section 14, and the second tube 4 has a second reinforced section 19 and a second non-reinforced section 20. In this case, it is preferred that the reinforced section 13 of the first tube 3 and the second reinforced section 19 of the second tube 4 are arranged to overlap in the length direction in the tube overlap section 21. It is preferred that the first tube 3 and the second tube 4 are joined to each other in at least a portion of the non-reinforced section 14 and / or the second non-reinforced section 20, and the first tube 3 and the second tube 4 can be joined to each other by any combination of the joining methods described above. It is preferred that the reinforced section 13 of the first tube 3 extends from the reinforced layer overlap section 23 to the distal side of the distal end of the tube overlap section 21, and the second reinforced section 19 of the second tube 4 extends from the reinforced layer overlap section 23 to the proximal side of the proximal end of the tube overlap section 21.

[0104] Preferably, the first tube 3 has a non-reinforced section 14 at the tube overlap portion 21. The first tube 3 extending to the distal side than the second tube 4 has the non-reinforced section 14, and the first tube 3 and the second tube 4 are joined to each other at the non-reinforced section 14 of the first tube 3, so that the first tube 3 and the second tube 4 are easily pulled toward the proximal side. By pulling the second tube 4 toward the proximal side, the entire first tube 3 is easily pulled toward the proximal side, so that when the medical tubular body 9 is placed in the body, the first tube 3 and the second tube 4 are easily pulled toward the proximal side smoothly.

[0105] The first tube 3 and the second tube 4 can be joined to each other by known joining means such as bonding and welding, preferably by welding. Thus, the first tube 3 and the second tube 4 can be firmly joined. In addition, it is easy to heat the first tube 3 located outside the tube overlap portion 21 from the outside to join it with the second tube 4 located inside. In this case, if the first tube 3 has a non-reinforced section 14 in the tube overlap portion 21, it is easy to weld the first tube 3 to the second tube 4 in the non-reinforced section 14.

[0106] When the second tube 4 has the second non-reinforced section 20, it is preferred that at least a portion of the inner surface of the second tube 4 from the second non-reinforced section 20 to the second reinforced section 19 is made of the same resin material. Thus, when the shaft 2 is inserted into the forceps channel of the endoscope and conveyed to the lesion, the second tube 4 is less likely to be broken at the boundary between the second reinforced section 19 and the second non-reinforced section 20. In this case, the second tube 4 may have the entire inner surface of the second reinforced section 19 made of the same resin material, or a portion of the inner surface of the second reinforced section 19 and the other portions may be made of different resin materials.

[0107] The second tube 4 is preferably configured such that the reinforcement layer 18 is disposed between the inner layer and the outer layer, and the outer layer of the second tube 4 is preferably composed of polyester resin, polyamide resin, polyether polyamide resin, polyolefin resin, aromatic polyether ketone resin, polyimide resin, polyamide imide resin or polyurethane resin. Thus, it is easy to join the first tube 3 and the second tube 4 by bonding or welding. The outer layer of the second tube 4 may also be composed of the same resin as the inner layer 15 (particularly the second inner layer 15B) of the first tube 3, thereby enabling the first tube 3 and the second tube 4 to be joined more firmly.

[0108] The inner layer of the second tube 4 is preferably made of resin. The type of resin constituting the inner layer of the second tube 4 is not particularly limited, and can be made of, for example, polyester resin, polyamide resin, polyolefin resin, aromatic polyether ketone resin, polyimide resin, polyamide-imide resin, fluorine-based resin or polyurethane resin.

[0109] The outer layer 16 of the first tube 3 is preferably made of resin. The type of resin constituting the outer layer 16 of the first tube 3 is not particularly limited, but is preferably made of polyester resin, polyamide resin, polyether polyamide resin, polyolefin resin, aromatic polyether ketone resin, polyimide resin, polyamide imide resin or polyurethane resin. In this way, the outer layer 16 and the inner layer 15 (especially the second inner layer 15B) can be firmly bonded by bonding or welding, and the integrity of the entire first tube 3 including the reinforcement layer 10 can be easily improved. It is also preferred that the outer layer 16 is made of the same resin as the inner layer 15 (especially the second inner layer 15B), so that the outer layer 16 and the inner layer 15 can be more firmly bonded.

[0110] Reference Figure 11 to Figure 13 A description will be given of a configuration example of the shaft portion 2 including the first tube 3 and the second tube 4. In addition, the structure of the shaft portion 2 is not limited to the configuration example shown in the drawings.

[0111] Fig.11 The shaft portion 2 shown has a first tube 3, a second tube 4 connected to the proximal portion of the first tube 3, and an inner tube 5 disposed in the inner lumens of the first tube 3 and the second tube 4. At the distal portion of the shaft portion 2, a medical tubular body 9 is disposed between the first tube 3 and the inner tube 5.

[0112] The inner tube 5 extends from the distal portion to the proximal portion of the shaft portion 2, providing an OTW (Over-The-Wire) type conveying device. The first tube 3 is arranged at the distal portion of the shaft portion 2. The second tube 4 connected to the proximal portion of the first tube 3 extends toward the proximal side 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 toward the proximal side from the proximal end of the second tube 4. A front end tip 7 is provided at the distal end portion of the inner tube 5, and a limiter 6 is provided on the outer surface of the inner tube 5 on the proximal side of the medical tubular body 9. The first tube 3 and the second tube 4 can slide relative to the inner tube 5 in the length direction. Equipped with Fig.11 The delivery device of the shaft portion 2 shown can pull the second tube 4 proximally to move the first tube 3 proximally to expose the medical tubular body 9 to the outside of the shaft portion 2 , thereby placing the medical tubular body 9 indwelling in the body.

[0113] Fig.12 The shaft portion 2 shown has a first tube 3, a second tube 4 connected to the proximal portion of the first tube 3, an inner tube 5 arranged in the inner lumens of the first tube 3 and the second tube 4, and a protective tube 24 arranged outside the second tube 4. At the distal portion of the shaft portion 2, a medical tubular body 9 is arranged between the first tube 3 and the inner tube 5.

[0114] The inner tube 5 extends from the distal portion to the proximal portion of the shaft portion 2, providing an OTW (Over-The-Wire) type delivery device. The first tube 3 is arranged at the distal portion of the shaft portion 2. The second tube 4 connected to the proximal portion of the first tube 3 extends toward the proximal side 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 toward the proximal side from the proximal end of the second tube 4. The protective tube 24 is provided to cover a portion of the second tube 4, and the second tube 4 extends toward the distal side from the distal end of the protective tube 24, and extends toward the proximal side from the proximal end of the protective tube 24. A front end tip 7 is provided at the distal end portion of the inner tube 5, and a limiter 6 is provided on the outer surface of the inner tube 5 on the proximal side of the medical tubular body 9. The first tube 3 and the second tube 4 can slide in the length direction relative to the protective tube 24 and the inner tube 5. It has Fig.12 The delivery device of the shaft portion 2 shown can pull the second tube 4 proximally to move the first tube 3 proximally to expose the medical tubular body 9 to the outside of the shaft portion 2 , thereby placing the medical tubular body 9 indwelling in the body.

[0115] Fig.13 The shaft portion 2 shown has a first tube 3, a second tube 4 connected to the proximal portion of the first tube 3, a protection tube 24 arranged outside the second tube 4 and extending proximally from the proximal end of the second tube 4, an inner tube 5 arranged in the inner lumens of the first tube 3, the second tube 4, and the protection tube 24, and a linear traction member 25 mounted on the proximal portion of the second tube 4 and arranged in the inner lumen of the protection tube 24. A medical tubular body 9 is arranged between the first tube 3 and the inner tube 5 at the distal portion of the shaft portion 2.

[0116] The inner tube 5 extends from the distal portion of the shaft 2 to the middle of the proximal portion (i.e., does not extend to the proximal portion), providing an RX (Rapid Exchange) type delivery device. In addition, by configuring the inner tube 5 to extend from the distal portion of the shaft 2 to the proximal portion, an OTW (Over-The-Wire) type delivery device can also be provided. The first tube 3 is arranged at the distal portion of the shaft 2. The second tube 4 connected to the proximal portion of the first tube 3 extends toward the proximal side from the proximal end of the first tube 3, but does not extend to the proximal portion of the shaft 2. The linear traction member 25 installed on the proximal portion of the second tube 4 extends toward the proximal side from the proximal end of the second tube 4 and extends to the proximal portion of the shaft 2. The protective tube 24 is provided to cover a portion of the second tube 4 and a portion of the linear traction member 25, and the linear traction member 25 extends toward the proximal side from the proximal end of the protective tube 24. 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 at the proximal side of the medical tubular body 9. The first tube 3 and the second tube 4 can slide in the longitudinal direction relative to the protective tube 24 and the inner tube 5. The linear traction member 25 is not fixed relative to the protective tube 24. Fig.13The delivery device of the shaft portion 2 shown can pull the linear traction member 25 proximally to move the first tube 3 proximally to expose the medical tubular body 9 to the outside of the shaft portion 2 , thereby placing the medical tubular body 9 indwelling in the body.

[0117] for Fig.12 and Fig.13 As for the shaft portion 2 shown in the figure, when the medical tubular body 9 is placed in the body, if the second tube 4 is pulled toward the proximal side, a part of the portion not covered by the protective tube 24 of the second tube 4 is accommodated in the inner cavity of the protective tube 24. As a result, when the second tube 4 is pulled toward the proximal side, the generation of friction resistance caused by the contact between the second tube 4 and the forceps channel and the forceps opening of the endoscope can be reduced. Therefore, the operation load when the first tube 3 and the second tube 4 are pulled toward the proximal side can be reduced, and the medical tubular body 9 can be stably deployed. In addition, when the first tube 3 and the second tube 4 are pulled toward the proximal side, the entire shaft portion 2 can be suppressed from moving toward the proximal side, and the medical tubular body 9 can be placed at a desired position with high accuracy.

[0118] Regarding the constituent material of the protection tube 24, refer to the description of the first tube 3 and the second tube 4. The linear traction member 25 can be composed of a metal wire or a yarn, and the yarn is formed of a synthetic resin. The linear traction member 25 can be a composite composed of multiple materials, for example, a composite of metal and synthetic resin. The linear traction member 25 can also be a structure in which a resin is coated on a metal wire.

Claims

1. A medical tubular body delivery device, which is a device having a length direction and is used to deliver a medical tubular body into the body, characterized in that: have: A first tube extending along the length direction and having a receiving portion for the medical tubular body to be arranged in the inner cavity; and The second tube extends along the length direction, is inserted into a portion of the first tube in the length direction including the proximal end, and extends proximally from the proximal end of the first tube. The first tube has a first section including a distal end and a second section closer to the first section in the length direction, and the storage portion is provided in the first section. The first tube has an inner layer, an outer layer, and a reinforcement layer composed of a wire disposed therebetween, wherein the reinforcement layer is disposed at least in the first section. The static friction coefficient of the inner surface of the inner layer in the first section of the first tube is smaller than the static friction coefficient of the inner surface of the inner layer in the second section, The first tube is joined to the second tube in the second section.

2. The medical tubular conveying device according to claim 1, characterized in that: The reinforcement layer is provided from the first section to the second section and overlaps with the second tube.

3. The medical tubular conveying device according to claim 2, characterized in that: The first tube includes, in the second section, a reinforced section having the reinforced layer and a non-reinforced section located closer to the side than the reinforced section and not having the reinforced layer. The first pipe is joined to the second pipe in both the reinforced section and the non-reinforced section in the second section.

4. The medical tubular conveying device according to claim 2, characterized in that: The first tube includes, in the second section, a reinforced section having the reinforced layer and a non-reinforced section located closer to the side than the reinforced section and not having the reinforced layer. In the second section, the first tube is joined to the second tube in the non-reinforced section, and is not joined to the second tube in the reinforced section.

5. The medical tubular body conveying device according to any one of claims 2 to 4, characterized in that: The second tube has a reinforcement layer composed of wire material, In the length direction, the reinforcement layer of the first tube and the reinforcement layer of the second tube are arranged to overlap.

6. The medical tubular conveying device according to claim 5, characterized in that: The second tube comprises: a second reinforced section having the reinforced layer; and a second non-reinforced section located at a distal side of the second reinforced section and not having the reinforced layer. The second pipe is joined to the first pipe in both the second reinforced section and the second non-reinforced section.

7. The medical tubular body conveying device according to claim 5, characterized in that: The second tube comprises: a second reinforced section having the reinforced layer; and a second non-reinforced section located at a distal side of the second reinforced section and not having the reinforced layer. The second tube is joined to the first tube in the second non-reinforced section, and is not joined to the first tube in the second reinforced section.

8. The medical tubular conveying device according to any one of claims 1 to 4, characterized in that: The inner layer in the first section is made of a resin different from that of the inner layer in the second section.

9. The medical tubular conveying device according to claim 8, characterized in that: The inner layer in the first section is made of a fluorine-based resin or a polyolefin resin.

10. The medical tubular body conveying device according to any one of claims 1 to 4, characterized in that: The inner surface of the inner layer in the first section is subjected to surface roughening treatment.

11. The medical tubular body conveying device according to any one of claims 1 to 4, characterized in that: The inner surface of the inner layer in the second section is subjected to surface roughening treatment.

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