Medical instrument

Abstract

Provided is a medical instrument in which the pull-out load of an inner tube member is small when an in-vivo indwelling tube is indwelled in an affected area, the workability of an operator is good, and the positioning of the in-vivo indwelling tube is easy. A medical instrument (1) is provided with: an in vivo indwelling tube (10) having a proximal end (10a) and a distal end (10b) in the longitudinal direction; and an inner tube member (20) disposed in the lumen of the in-vivo indwelling tube, having a longitudinal direction, a proximal end (20a) and a distal end (20b), the in-vivo indwelling tube having an arcuate portion (A) bent in an arcuate shape, and a non-arcuate portion (B) positioned closer to the side than the arcuate portion, the inner tube member being disposed in at least a portion of the non-arcuate portion, and the distal end (20a) being disposed in the distal direction of the inner tube member (20). The arc-shaped portion is not disposed in the arc-shaped portion.

Description

Technical Field

[0001] This invention relates to medical devices comprising indwelling catheters within a biological body. Background Technology

[0002] The lumens of biological ducts, such as blood vessels, bile ducts, or pancreatic ducts, can sometimes become narrowed or blocked due to various reasons. As a method for treating various diseases caused by narrowing or blockage, it is known to place a tubular stent at the site of narrowing or blockage to expand the lumen of the biological duct from the inside. For example, in the case of narrowing or blockage of the bile duct, a bile duct stent is delivered to the site of narrowing or blockage. The stent delivered to the site of narrowing or blockage is left in place, expanding the narrowing or blockage from the inside. Through the placement of the stent, the inner diameter of the bile duct at the site of narrowing or blockage is increased, and the narrowing or blockage is improved. As a result, bile can be drained from the bile duct towards the duodenum, and various diseases caused by narrowing or blockage of the bile duct, such as biliary obstruction, jaundice, and biliary cancer, can be treated. For example, medical devices having such stents are described in Patent Documents 1 and 2.

[0003] Patent Document 1 describes a stent assembly consisting of a tubular stent and an inner catheter. At least one end of the tubular stent has a stent arc portion formed by at least a portion of an arc, and the inner catheter has an inner arc portion with the same shape as the stent arc portion, inserted into the interior of the tubular stent in such a manner that the inner arc portion aligns with the stent arc portion. Patent Document 2 describes a medical device having a tubular indwelling member and an inner catheter inserted into the indwelling member. This medical device is characterized in that the indwelling member has a first curved portion pre-shaped into a curved shape, and the inner catheter has a second curved portion pre-shaped into a curved shape different from the first curved portion, the second curved portion being inserted into the first curved portion.

[0004] Patent Document 1: Japanese Patent No. 5408682

[0005] Patent Document 2: Japanese Patent Application Publication No. 2022-52207

[0006] Patent Document 1 describes a stent kit with an inner catheter positioned at the arcuate portion of the stent tube. Patent Document 2 describes a medical device with an inner catheter positioned at the first bend of the tubular indwelling member. Thus, in Patent Documents 1 and 2, because the inner catheter is positioned at the arcuate portion of the stent tube or indwelling member, when the stent tube or indwelling member is placed on the affected area, the stent tube or indwelling member easily comes into contact with the inner catheter, increasing the load when removing the inner catheter from the stent tube or indwelling member, making operation difficult. Furthermore, due to the increased removal load and difficulty in operation, the placement position of the stent tube or indwelling member is prone to deviating from the desired position, making positioning difficult. Summary of the Invention

[0007] The present invention was made in view of the above situation, and its purpose is to provide a medical device that has a small pull-out load on the inner cylinder component when placing an indwelling biological catheter in the affected area, good operability for the operator, and easy positioning of the indwelling biological catheter.

[0008] The present invention is as follows.

[0009] [1] A medical device comprising: an indwelling tube in vivo having a length direction and having a proximal end and a distal end; and an inner tube component disposed in the lumen of the indwelling tube in vivo having a length direction and having a proximal end and a distal end, the indwelling tube in vivo having: an arcuate portion bent into an arc shape, and a non-arcuate portion located closer to the arcuate portion than the arcuate portion, the inner tube component being disposed in at least a portion of the non-arcuate portion and not disposed in the arcuate portion.

[0010] [2] Based on the medical instruments described in [1],

[0011] The aforementioned indwelling tube in the biological body has a proximal arc portion at a position closer to the position side than the aforementioned arc portion, and the aforementioned inner cylinder component is disposed in the aforementioned proximal arc portion.

[0012] [3] Based on the medical devices described in [1] or [2],

[0013] The aforementioned arcuate portion of the indwelling tube in the biological body is configured to form a closed ring when viewed from above.

[0014] [4] Based on any one of [1] to [3], the medical instruments described,

[0015] The aforementioned inner cylinder component has an outer diameter expansion region at its distal end, with the outer diameter increasing toward the distal end.

[0016] [5] According to any one of [1] to [4], medical instruments,

[0017] The aforementioned inner cylinder component has an inner diameter expansion region at its distal end, where the inner diameter increases toward the distal end.

[0018] [6] According to any one of [1] to [5],

[0019] The aforementioned inner cylinder component has a tapered portion at its distal end, with the outer diameter decreasing toward the distal end.

[0020] [7] According to any one of [1] to [6],

[0021] The aforementioned inner cylinder component has an X-ray non-transmissive marker at its distal end.

[0022] [8] According to any one of [1] to [7],

[0023] The inner cylinder component has: a small outer diameter region having an outer diameter smaller than the inner diameter of the proximal end of the indwelling tube in the biological body; and a large outer diameter region located closer to the position side than the small outer diameter region and having an outer diameter larger than the inner diameter of the proximal end of the indwelling tube in the biological body, the small outer diameter region and the large outer diameter region being arranged along the length direction of the inner cylinder component.

[0024] [9] According to any one of [1] to [8], medical instruments,

[0025] The aforementioned indwelling tube in the biological body has a through hole on its side wall.

[0026]

[10] According to any one of [1] to [9],

[0027] The aforementioned indwelling tube in vivo has locking flaps on the outer surface of the proximal end and / or the outer surface of the distal end of the indwelling tube in vivo.

[0028]

[11] According to any one of [1] to

[10] ,

[0029] The aforementioned indwelling tubes in the body are plastic tube stents placed in the bile duct or pancreatic duct.

[0030]

[12] According to any one of [1] to

[11] ,

[0031] The aforementioned medical device further includes an outer cylindrical component having a length direction and a linear body. The outer cylindrical component is disposed outside the inner cylindrical component at a position closer to the proximal end of the indwelling tube than the proximal end of the indwelling tube, and is movable relative to the length direction of the inner cylindrical component. The outer cylindrical component has a through hole in the side wall of the distal portion of the outer cylindrical component, and the indwelling tube has a through hole in the side wall of the proximal portion of the indwelling tube. The linear body is configured as a closed ring passing through the through hole of the outer cylindrical component. A portion of the distal end of the outer cylindrical component is disposed in the ring at a position more distal to the through hole of the outer cylindrical component. The ring of the linear body passes through the through hole of the indwelling tube, and the inner cylindrical component is disposed in the ring.

[0032] The medical device of this invention comprises: an indwelling biological catheter having an arcuate portion and a non-arcuate portion located closer to the position of the arcuate portion; and an inner cylinder component disposed within the cavity of the indwelling biological catheter, wherein the inner cylinder component is not disposed along the entire length of the indwelling biological catheter, but is disposed at a predetermined position within the indwelling biological catheter. Therefore, the sliding friction caused by the contact between the indwelling biological catheter and the inner cylinder component is reduced, thereby reducing the pull-out load of the inner cylinder component when the indwelling biological catheter is placed in the affected area. This improves the operator's workability and facilitates the positioning of the indwelling biological catheter. Attached Figure Description

[0033] Figure 1 This is a cross-sectional view showing an embodiment of the medical device involved in the present invention.

[0034] Figure 2 This is a schematic diagram used to illustrate the determination method.

[0035] Figure 3 This is a schematic diagram used to illustrate the determination method.

[0036] Figure 4 This is a schematic diagram used to illustrate the determination method.

[0037] Figure 5 This is a cross-sectional view showing other embodiments of the medical device involved in the present invention.

[0038] Figure 6 This is a cross-sectional view showing other embodiments of the medical device involved in the present invention.

[0039] Figure 7 This is a cross-sectional view showing other embodiments of the medical device involved in the present invention.

[0040] Figure 8 This is a cross-sectional view showing other embodiments of the medical device involved in the present invention.

[0041] Figure 9 This is a cross-sectional view showing other embodiments of the medical device involved in the present invention.

[0042] Figure 10 This is a cross-sectional view showing other embodiments of the medical device involved in the present invention.

[0043] Figure 11 This is a cross-sectional view showing other embodiments of the medical device involved in the present invention.

[0044] Figure 12 This is a cross-sectional view showing other embodiments of the medical device involved in the present invention.

[0045] Figure 13This is a cross-sectional view showing other embodiments of the medical device involved in the present invention.

[0046] Figure 14 This is a cross-sectional view showing other embodiments of the medical device involved in the present invention. Detailed Implementation

[0047] The medical device in an embodiment of the present invention includes: an indwelling tube in vivo, having a length direction and having a proximal end and a distal end; and an inner tube component disposed in the lumen of the indwelling tube in vivo, having a length direction and having a proximal end and a distal end. The medical device is characterized in that the indwelling tube in vivo has: an arcuate portion bent into an arc shape, and a non-arcuate portion located closer to the arcuate portion than the arcuate portion. The inner tube component is disposed in at least a portion of the non-arcuate portion and is not disposed in the arcuate portion.

[0048] The present invention will now be described in more detail based on embodiments, but the present invention is not limited to the embodiments described below. Of course, modifications can be made within the scope that conforms to the above and following spirit, and these modifications are all included within the technical scope of the present invention. Furthermore, in the various drawings, for ease of explanation, there are instances where shaded lines, component reference numerals, etc., are omitted. In such cases, please refer to the specification and other drawings. Additionally, the dimensions of various components in the drawings are intended to facilitate understanding of the features of the present invention, and therefore may differ from the actual dimensions.

[0049] Figure 1 This is a cross-sectional view illustrating an embodiment of the medical device according to the present invention. For example... Figure 1 As shown, the medical device 1 includes an indwelling biological catheter 10 and an inner tube component 20, a portion of which is disposed within the lumen of the indwelling biological catheter 10. The indwelling biological catheter 10 has a length direction and includes a proximal end 10a and a distal end 10b. The inner tube component 20 has a length direction and includes a proximal end 20a and a distal end 20b. The proximal end 10a of the indwelling biological catheter 10 and the proximal end 20a of the inner tube component 20 refer to the end on the user side (operator side), and the distal end 10b of the indwelling biological catheter 10 and the distal end 20b of the inner tube component 20 refer to the end opposite to the proximal end (i.e., the end on the treatment subject side). The direction from the proximal end 10a to the distal end 10b of the indwelling biological catheter 10 and the direction from the proximal end 20a to the distal end 20b of the inner tube component 20 are respectively referred to as the length direction.

[0050] The indwelling tube 10 has an arc-shaped portion A and a non-arc portion B located closer to the position of the arc portion A. Whether the indwelling tube 10 belongs to the arc portion A or the non-arc portion B is determined by the following method.

[0051] <Judgment Method>

[0052] like Figure 2 As shown, in a top view, point a is designated as the target point on the central axis 11 of the indwelling tube 10. Point b is designated as the point 2.5 mm away from point a along the central axis 11 towards the proximal end of the indwelling tube 10. Point c is designated as the point 5 mm away from point a along the central axis 11 towards the proximal end of the indwelling tube 10. An imaginary circle 12 is constructed passing through points a, b, and c. The line segment connecting point a to the center o of the imaginary circle 12 is designated as line segment ao. Point x is designated as the point on the imaginary circle 12 that is closer to the proximal end 10a of the indwelling tube 10 than point a. When the central angle relative to arc ax is 45°, if the indwelling tube 10 intersects line segment ox, point a is determined to belong to the arc portion A of the indwelling tube 10. If the indwelling tube 10 does not intersect line segment ox, point a is determined to belong to the non-arc portion B of the indwelling tube 10. The so-called situation where the indwelling tube 10 in the biological body intersects with the line segment ox refers to, for example, Figure 2 As shown, a portion of the indwelling catheter 10 in the organism intersects with line segment ox, or as... Figure 3 As shown, the entire indwelling tube 10 in the biological body intersects line segment ox. The situation where the indwelling tube 10 in the biological body does not intersect line segment ox refers to, for example... Figure 4 As shown, the indwelling tube 10 in the biological body is separated from the line segment ox without intersecting.

[0053] The inner cylinder component 20 is disposed in at least a portion of the non-circular portion B of the indwelling tube 10, but not in the circular portion A of the indwelling tube 10. This reduces the pull-out load of the inner cylinder component 20 when the indwelling tube 10 is placed in the affected area, thus improving operator workability and facilitating the positioning of the indwelling tube 10. When the indwelling tube 10 is disposed in the non-circular portion B, the friction between the indwelling tube 10 and the inner cylinder component 20 is low, further reducing the pull-out load of the inner cylinder component 20 when the indwelling tube 10 is placed in the affected area. Figure 1 As shown, the inner cylinder component 20 can also be configured in all non-circular arc portions B of the indwelling tube 10 in the body.

[0054] Figure 5 This is a cross-sectional view showing other embodiments of the medical device according to the present invention. (Regarding...) Figure 1 The same reference numerals should be used for the same parts to avoid repetitive descriptions. The same applies below.

[0055] Figure 5The indwelling tube 10 shown has at least an inner diameter Sd1 and an inner diameter Sd2 smaller than Sd1. The inner diameter Sd2 is positioned more distally than the inner diameter Sd1 in the length direction. The maximum outer diameter CD1 at the distal end of the inner tube component 20 can also be smaller than the inner diameter Sd1 of the indwelling tube 10, but larger than the inner diameter Sd2. By making the maximum outer diameter CD1 at the distal end of the inner tube component 20 smaller than the inner diameter Sd1 of the indwelling tube 10, the inner tube component 20 can be positioned within the lumen of the indwelling tube 10. By making the maximum outer diameter CD1 at the distal end of the inner tube component 20 larger than the inner diameter Sd2 of the indwelling tube 10, the distal end of the inner tube component 20 abuts against the inner wall of the indwelling tube 10, allowing adjustment of the position of the distal end 20b of the inner tube component 20 in the length direction. The distal end of the inner cylinder component 20 refers to the region extending 60 mm in length from the distal end 20b of the inner cylinder component 20 towards the proximal side. The distal end of the inner cylinder component 20 can also be disposed within the lumen of the indwelling tube 10 in vivo. As described later, an outer diameter expansion region and an inner diameter expansion region can also be formed at the distal end of the inner cylinder component 20. As described later, an X-ray non-transmissive marker can also be formed at the distal end of the inner cylinder component 20.

[0056] The inner diameter of the non-circular portion B of the indwelling tube 10 can be Sd1, and the inner diameter of the circular portion A can be Sd2. Therefore, the inner cylinder component 20 can be disposed in at least a portion of the inner cavity of the non-circular portion B, and not in the circular portion A.

[0057] The inner diameter of the indwelling tube 10 in the biological body is the length of the region in the length direction of Sd1, which can be more than 10% of the length of the indwelling tube 10 in the biological body. The inner diameter of the indwelling tube 10 in the biological body is the length of the region in the length direction of Sd2, which can be more than 10% of the length of the indwelling tube 10 in the biological body.

[0058] The movement of the inner cylinder component 20 distally along its length within the lumen of the indwelling tube 10 within the biological body can also be restricted. The movement of the inner cylinder component 20 can be, for example, by means of... Figure 5As shown, the indwelling tube 10 is a biological indwelling tube with at least inner diameters Sd1 and Sd2. The maximum outer diameter CD1 at the distal end of the inner tube 20 is limited by satisfying the relationship: inner diameter Sd1 > maximum outer diameter CD1 > inner diameter Sd2. Alternatively, it can be limited by fixing the inner tube 20 and the outer tube 50 (described later) to the proximal side. When fixing the inner tube 20 to the proximal side, for example, the proximal end of the inner tube 20 can be fixed to a handle or the like. The method of fixing the proximal end of the inner tube 20 to the handle or the like is not particularly limited. For example, a connecting mechanism such as a Luer lock, a connector, or other fitting mechanism can be provided on the handle body, via which the proximal end of the inner tube 20 is fixed to the handle body.

[0059] Figure 6 This is a cross-sectional view showing other embodiments of the medical device involved in the present invention. Figure 6 The medical device 1 shown includes an indwelling biological catheter 10 and an inner tube component 20. The indwelling biological catheter 10 has: an arc-shaped portion A, a non-arc portion B located closer to the affected area than the arc portion A, and a distal arc portion C located more distal to the affected area than the arc portion A. The inner tube component 20 is disposed in the non-arc portion B and not in the arc portion A. This reduces the pull-out load on the inner tube component 20 when the indwelling biological catheter 10 is placed in the affected area, thus improving operator workability and facilitating the positioning of the indwelling biological catheter 10.

[0060] like Figure 6 As shown, by having a distal arcuate portion C, it is possible to prevent the indwelling tube 10 placed in the bile duct or pancreatic duct from dislodging from the bile duct or pancreatic duct toward the duodenum.

[0061] Figure 7 This is a cross-sectional view showing other embodiments of the medical device involved in the present invention. Figure 7 The medical device 1 shown has an indwelling biological catheter 10 and an inner tube component 20. The indwelling biological catheter 10 has an arc-shaped portion A and a non-arc portion B located closer to the affected side than the arc portion A. The inner tube component 20 is disposed in the non-arc portion B and not in the arc portion A. As a result, the pull-out load of the inner tube component 20 when the indwelling biological catheter 10 is placed in the affected area can be reduced, thus improving the operator's workability and making the positioning of the indwelling biological catheter 10 easier.

[0062] Figure 7 The arc portion A of the indwelling tube 10 shown is configured to be a closed ring when viewed from above. By configuring the arc portion A to be a closed ring when viewed from above, it is possible to prevent the indwelling tube 10 placed in the bile duct or pancreatic duct from dislodging from the bile duct or pancreatic duct toward the duodenum.

[0063] The indwelling catheter 10 in the biological body can also have locking flaps, for example, such as Figure 7 As shown, the non-arc portion B of the indwelling tube 10 may also have a locking flap 13. Preferably, the locking flap 13 is provided on the outer surface of the proximal end of the indwelling tube 10. By having a locking flap 13 on the outer surface of the proximal end of the indwelling tube 10, it is possible to prevent the indwelling tube 10 disposed in the bile duct or pancreatic duct from entering the bile duct or pancreatic duct from the duodenal papilla.

[0064] When the indwelling tube 10 has an arcuate portion A, a locking flap 13 may be provided on a side distal to the arcuate portion A. More preferably, the locking flap 13 is disposed on the outer surface of the distal end of the indwelling tube 10. By providing the locking flap 13 on the outer surface of the distal end of the indwelling tube 10, it is possible to prevent, for example, the indwelling tube 10 disposed within the bile duct or pancreatic duct from dislodging towards the duodenum.

[0065] The indwelling tube 10 may also have locking flaps 13 on both the outer surface of its distal end and the outer surface of its proximal end. The proximal end of the indwelling tube 10 refers to the region from the proximal end 10a of the indwelling tube 10 to a position one-third of the length of the indwelling tube 10, and the distal end of the indwelling tube 10 refers to the region from the distal end 10b of the indwelling tube 10 to a position one-third of the length of the indwelling tube 10. When the length of the indwelling tube 10 in the body is 180 mm or more, the proximal end of the indwelling tube 10 in the body can be defined as the region from the proximal end 10a of the indwelling tube 10 to a position 60 mm away from the proximal end 10a in the body in the length direction, and the distal end of the indwelling tube 10 in the body can be defined as the region from the distal end 10b of the indwelling tube 10 to a position 60 mm away from the distal end 10b in the body in the length direction, proximal to the body in the length direction.

[0066] The number of locking flaps 13 disposed at the distal end of the indwelling tube 10 in the biological body and the number of locking flaps 13 disposed at the proximal end of the indwelling tube 10 in the biological body can each be one, for example, two or more, three or more, preferably five or less. That is, it can be one to five, two to five, or three to five.

[0067] When multiple locking flaps 13 are arranged at the distal end of the indwelling tube 10 or at the proximal end of the indwelling tube 10, it is preferable that the locking flaps are arranged at equal intervals in the circumferential direction of the indwelling tube 10. This improves the effect of preventing the indwelling tube 10 from shifting position.

[0068] When multiple locking flaps 13 are disposed at the distal end or the proximal end of the indwelling tube 10 in the biological body, the length from the base to the free end of each locking flap 13, as well as the width and thickness of each locking flap 13, can be the same or different. For example, if the length, width, and thickness of each locking flap 13 are the same, manufacturing becomes easier. Furthermore, by varying the length, width, and thickness of each locking flap 13, the strength of each locking flap 13 can be altered. As a specific example, the strength of a locking flap 13 disposed in a location where stress is easily applied and breakage is possible can be increased, or the strength of a locking flap 13 disposed in a location requiring flexibility can be decreased.

[0069] The locking wing 13 can be formed at the distal end and / or proximal end of the tube body by cutting a slit on the surface of the end of the tube body constituting the indwelling tube 10 in the body, so that a part of the tube body protrudes obliquely outward relative to the tube body. Alternatively, the locking wing component constituting the locking wing 13 can be a component different from the tube body constituting the indwelling tube 10 in the body and disposed at the distal end and / or proximal end of the tube body.

[0070] As the resin material constituting the indwelling catheter 10 (i.e., the resin material constituting the tube body that serves as the raw material for the indwelling catheter 10), known resins can be used, such as polyamide resins like nylon; polyether polyamide resins; polyimide resins; polyester resins like polyethylene terephthalate (PET); polyurethane resins; polyolefin resins like polyethylene and polypropylene; fluorinated resins like polytetrafluoroethylene (PTFE), perfluoroalkoxyalkylene (PFA), and ethylene-tetrafluoroethylene copolymer (ETFE); polyvinyl chloride resins; silicone resins; and natural rubber. Only one type can be used, or two or more types can be used in combination. Among these, polyamide resins, polyurethane resins, polyolefin resins, and fluorinated resins are preferred. Since the indwelling catheter 10 contains at least one of polyamide resins, polyurethane resins, polyolefin resins, and fluorinated resins, it is possible to achieve both biocompatibility and flexibility of the indwelling catheter 10.

[0071] The indwelling tube 10 can be a single-layer or multi-layer structure, preferably a single-layer structure. A single-layer structure allows for easy manufacturing. In the case of a multi-layer structure, the resin materials constituting each layer can be the same or different.

[0072] The indwelling tube 10 in the body can be a single tube from the proximal end to the distal end, or it can be a tube composed of multiple tubes joined together.

[0073] When the locking wing component is joined to the outer surface of the tube body to form the locking wing 13, the locking wing component may be made of the same material as or different from the material constituting the tube body, but it is preferable that they are the same. By making them the same, the bonding strength between the locking wing component and the tube body can be improved.

[0074] Methods for joining the tube body and the locking wing component include, for example, heat fusion, ultrasonic welding, and bonding with adhesives, with heat fusion being preferred. By joining the tube body and the locking wing component through heat fusion, the bonding strength between the tube body and the locking wing component can be improved.

[0075] The locking wing 13 is preferably formed by cutting a slit in the surface of the end of the tube body. As a result, the locking wing 13 is less likely to fall off compared to forming the locking wing 13 by joining the locking wing component to the outer surface of the tube body.

[0076] The locking flap 13 disposed at the distal end of the indwelling tube 10 in the body and the locking flap 13 disposed at the proximal end of the indwelling tube 10 in the body can be formed using the same method or using different methods.

[0077] Figure 8 This is a cross-sectional view showing other embodiments of the medical device involved in the present invention. Figure 8 The medical device 1 shown includes an indwelling biological catheter 10 and an inner tube component 20. The indwelling biological catheter 10 has: an arc-shaped portion A, a non-arc portion B located closer to the affected area than the arc portion A, and a distal arc portion C located more distal to the affected area than the arc portion A. The inner tube component 20 is disposed in the non-arc portion B and not in the arc portion A. This reduces the pull-out load on the inner tube component 20 when the indwelling biological catheter 10 is placed in the affected area, thus improving operator workability and facilitating the positioning of the indwelling biological catheter 10.

[0078] like Figure 8 As shown, the arcuate portion A of the indwelling tube 10 is configured to form a closed ring when viewed from above. By configuring the arcuate portion A to form a closed ring when viewed from above, it is possible to prevent the indwelling tube 10 placed in the bile duct or pancreatic duct from entering the bile duct or pancreatic duct from the duodenal papilla.

[0079] like Figure 8 As shown, the distal arcuate portion C of the indwelling tube 10 is configured as a closed ring. By configuring the distal arcuate portion C as a closed ring when viewed from above, it is possible to prevent the indwelling tube 10 placed in the bile duct or pancreatic duct from dislodging from the bile duct or pancreatic duct toward the duodenum.

[0080] like Figure 8 As shown, the indwelling tube 10 in the biological body may also have a through hole 16 on its side wall. Thus, fluid flowing within the biological lumen enters the indwelling tube 10 from the outside through the through hole 16, flowing from the distal side to the proximal side, thereby enabling drainage even when the indwelling tube 10 is left in the biological lumen. The location of the through hole 16 is not particularly limited. For example, as... Figure 8 As shown, it can be configured in the distal arc portion C of the indwelling tube 10 in the body, or in the interval connecting the arc portion A and the distal arc portion C, or in the arc portion A.

[0081] The size (equivalent circle diameter) of the through hole 16 is preferably 0.2 mm or more, more preferably 0.3 mm or more, even more preferably 0.5 mm or more, preferably 2.0 mm or less, more preferably 1.5 mm or less, and even more preferably 1.3 mm or less. That is, the size (equivalent circle diameter) of the through hole 16 is preferably 0.2 mm to 2.0 mm, more preferably 0.3 mm to 1.5 mm, and even more preferably 0.5 mm to 1.3 mm.

[0082] Examples of the opening shape of the through hole 16 include circles, ellipses, and rectangles (e.g., triangles, quadrilaterals, etc.). From the perspective of ease of processing, the opening shape of the through hole 16 is preferably circular or elliptical.

[0083] The number of through holes 16 can be, for example, one, two or more, or five or more. The number of through holes 16 is preferably 25 or less. More preferably, the number of through holes 16 is 23 or less, and even more preferably 20 or less. That is, the number of through holes 16 can be from one to 25, from two to 23, or from five to 20. Figure 8 As shown, when the indwelling tube 10 in the biological body has arc-shaped portions on both the proximal and distal sides, the number of through holes 16 formed in the arc-shaped portion A on the proximal side can be, for example, 8 to 10, and the number of through holes 16 formed in the arc-shaped portion C on the distal side can be, for example, 6 to 7.

[0084] When the indwelling tube 10 in the biological body has multiple through holes 16, the size and opening shape of each through hole can be the same or different. When the indwelling tube 10 in the biological body has multiple through holes 16, each through hole can be arranged along the length direction of the indwelling tube 10 in the biological body, or along the circumference of the indwelling tube 10 in the biological body, or arranged in a spiral manner relative to the length direction of the indwelling tube 10 in the biological body.

[0085] like Figure 8 As shown, the inner cylinder component 20 may also have an X-ray opaque marker 17 at its distal end. The X-ray opaque marker 17 allows the position of the inner cylinder component 20 to be confirmed under X-ray fluoroscopy.

[0086] The number of X-ray non-transmissive markers 17 is not particularly limited; it can be one, two or more, or three or more. Figure 8 In the middle, there is one at the far end of the inner cylinder component 20.

[0087] The shape of the X-ray non-transmissive marker 17 is not particularly limited, and examples include cylindrical (e.g., cylindrical, polygonal, etc.), C-shaped cross-section of a cut in a cylinder, and coil shape formed by winding wire. Among these, a cylindrical shape is preferred.

[0088] Materials constituting the X-ray non-transmissive marker 17 include, for example, lead, barium, iodine, tungsten, gold, platinum, iridium, stainless steel, titanium, cobalt-chromium alloys, and other X-ray non-transmissive materials.

[0089] Figure 9 This is a cross-sectional view showing other embodiments of the medical device involved in the present invention. Figure 9 The medical device 1 shown includes an indwelling biological catheter 10 and an inner tube component 20. The indwelling biological catheter 10 has: an arc-shaped portion A, a non-arc portion B located closer to the arc portion A, and a proximal arc portion D located closer to the arc portion A. The inner tube component 20 is disposed in the non-arc portion B and not in the arc portion A. This reduces the pull-out load of the inner tube component 20 when the indwelling biological catheter 10 is placed in the affected area, thus improving operator workability and facilitating the positioning of the indwelling biological catheter 10. Furthermore, by disposing the inner tube component 20 within the lumen of the proximal arc portion D, delivery performance is improved. The proximal arc portion D can also be positioned closer to the duodenum than the duodenal papilla, thus minimizing the indwelling load even when the inner tube component 20 is disposed within the lumen of the proximal arc portion D. That is, when the indwelling tube 10 in the body has multiple arc-shaped portions and there are non-arc-shaped portions B between adjacent arc-shaped portions, the inner cylinder component 20 can be disposed in at least a part of the non-arc-shaped portions B, and not disposed in the arc-shaped portion on the farthest side.

[0090] like Figure 9 As shown, the arcuate portion A of the indwelling tube 10 is configured to form a closed ring when viewed from above. By configuring the arcuate portion A to form a closed ring when viewed from above, it is possible to prevent the indwelling tube 10 placed in the bile duct or pancreatic duct from dislodging from the bile duct or pancreatic duct toward the duodenum.

[0091] like Figure 9 As shown, the proximal arcuate portion D of the indwelling tube 10 is configured as a closed ring when viewed from above. By configuring the proximal arcuate portion D as a closed ring when viewed from above, it is possible to prevent the indwelling tube 10 placed in the bile duct or pancreatic duct from entering the bile duct or pancreatic duct from the duodenal papilla.

[0092] Figure 10 This is a cross-sectional view illustrating another embodiment of the medical device according to the present invention, showing an enlarged view of the distal end of the inner cylinder component 20 and the indwelling tube 10 in vivo. For example... Figure 10 As shown, when the outer diameter of the inner cylinder component 20 is set to CD2, the inner cylinder component 20 can also have an outer diameter expansion region 22 at its distal end, where the outer diameter CD2 increases toward the distal end 20b. This allows the distal end of the inner cylinder component 20 to easily abut against the inner wall of the indwelling tube 10, thus reducing the deviation between the axis of the indwelling tube 10 and the axis of the inner cylinder component 20. Consequently, the guidewire 9 inserted from the distal end 10b of the indwelling tube 10 can be easily inserted from the distal end 20b of the inner cylinder component 20.

[0093] The location of the outer diameter expansion region 22 is preferably, for example, the interval from the distal end 20b of the inner cylinder component 20 to a position 60 mm away from the distal end 20b of the inner cylinder component 20 in the length direction, or the interval from the distal end 20b of the inner cylinder component 20 to a position 50 mm away from the distal end 20b of the inner cylinder component 20 in the length direction, or the interval from the distal end 20b of the inner cylinder component 20 to a position 40 mm away from the distal end 20b of the inner cylinder component 20 in the length direction.

[0094] Figure 11 This is a cross-sectional view illustrating another embodiment of the medical device according to the present invention, showing an enlarged view of the distal end of the inner cylinder component 20 and the indwelling tube 10 in vivo. For example... Figure 11As shown, when the inner diameter of the inner cylinder component 20 is set to Cd1, the inner cylinder component 20 may also have an inner diameter expansion region 23 at its distal end, where the inner diameter Cd1 increases toward the distal end 20b. This enlarges the opening at the distal end 20b of the inner cylinder component 20, making it easier to insert the guidewire 9, which is inserted from the distal end 10b of the indwelling tube 10, through the opening at the distal end 20b of the inner cylinder component 20.

[0095] In the case where the inner cylinder component 20 has an inner diameter expansion region 23, such as Figure 11 As shown, the outer diameter of the inner cylinder component 20 in the inner diameter expansion region 23 preferably increases towards the distal end 20b. That is, as Figure 11 As shown, the outer diameter in the inner diameter expansion region 23 of the inner cylinder component 20 can also form an outer diameter expansion region.

[0096] The location of the inner diameter expansion region 23 is preferably, for example, the interval from the distal end 20b of the inner cylinder component 20 to a position 60 mm away from the distal end 20b of the inner cylinder component 20 in the length direction, or the interval from the distal end 20b of the inner cylinder component 20 to a position 50 mm away from the distal end 20b of the inner cylinder component 20 in the length direction, or the interval from the distal end 20b of the inner cylinder component 20 to a position 40 mm away from the distal end 20b of the inner cylinder component 20 in the length direction.

[0097] Figure 12 This is a cross-sectional view illustrating another embodiment of the medical device according to the present invention, showing an enlarged view of the distal end of the inner cylinder component 20 and the indwelling tube 10 in vivo. For example... Figure 12 As shown, the inner cylinder component 20 may also have a tapered portion 24 at its distal end, with the outer diameter decreasing toward the distal end 20b. Therefore, even if the distal end 20b of the inner cylinder component 20 comes into contact with the inner wall of the indwelling tube 10 in the biological body, it is less likely to get stuck, thus reducing the pull-out load of the inner cylinder component 20 and improving the operator's workability.

[0098] Figure 13 This is a cross-sectional view showing other embodiments of the medical device involved in the present invention. Figure 13 The illustrated medical device 1 includes an indwelling biological catheter 10 and an inner tube component 20. The indwelling biological catheter 10 has: an arc-shaped portion A, a non-arc portion B located closer to the affected area than the arc portion A, and a distal arc portion C located more distal to the affected area than the arc portion A. The inner tube component 20 is disposed in the non-arc portion B, but not in the arc portion A or the distal arc portion C. This reduces the pull-out load on the inner tube component 20 when the indwelling biological catheter 10 is placed in the affected area, thus improving operator workability and facilitating the positioning of the indwelling biological catheter 10.

[0099] like Figure 13 As shown, the inner cylinder component 20 may have: a small outer diameter region 25 having an outer diameter smaller than the inner diameter at the proximal end 10a of the indwelling tube 10; and a large outer diameter region 26 located closer to the position side than the small outer diameter region 25 and having an outer diameter larger than the inner diameter at the proximal end 10a of the indwelling tube 10. The small outer diameter region 25 and the large outer diameter region 26 may be arranged along the length direction of the inner cylinder component 20. Thus, when the inner cylinder component 20 is inserted into the lumen of the indwelling tube 10, the small outer diameter region 25 of the inner cylinder component 20 is disposed in the lumen of the indwelling tube 10. On the other hand, since the distal end 20c of the large outer diameter region 26 of the inner cylinder component 20 abuts against the proximal end 10a of the indwelling tube 10, the large outer diameter region 26 of the inner cylinder component 20 is not disposed in the lumen of the indwelling tube 10. In this case, the inner cylinder component 20 functions as the outer cylinder component 50 (described later) and can also serve as a pushing component for the indwelling tube 10 in the body.

[0100] like Figure 13 As shown, the arcuate portion A of the indwelling tube 10 is configured to form a closed ring when viewed from above. By configuring the arcuate portion A to form a closed ring when viewed from above, it is possible to prevent the indwelling tube 10 placed in the bile duct or pancreatic duct from entering the bile duct or pancreatic duct from the duodenal papilla.

[0101] like Figure 13 As shown, the distal arcuate portion C of the indwelling tube 10 is configured as a closed ring. By configuring the distal arcuate portion C as a closed ring when viewed from above, it is possible to prevent the indwelling tube 10 placed in the bile duct or pancreatic duct from dislodging from the bile duct or pancreatic duct toward the duodenum.

[0102] The medical device 1 in embodiments of the present invention may further include an outer cylindrical component 50 having a longitudinal direction. When the medical device 1 includes the outer cylindrical component 50, the outer cylindrical component 50 is preferably positioned outside the inner cylindrical component 20 at a location closer to the proximal end 10a of the indwelling tube 10. In this case, the outer cylindrical component 50 is preferably configured to be movable relative to the longitudinal direction of the inner cylindrical component 20.

[0103] The proximal side of the outer cylinder component 50 can also be fixed to the proximal side of the inner cylinder component 20, thereby restricting the movement of the inner cylinder component 20 in the longitudinal direction. When the outer cylinder component 50 is fixed to the proximal side, for example, the proximal end of the outer cylinder component 50 can be fixed to a handle or the like. There is no particular limitation on the method of fixing the proximal end of the outer cylinder component 50 to the handle or the like; for example, a connecting mechanism such as a Luer lock, a connector, or other fitting mechanism can be provided on the handle body, and the proximal end of the outer cylinder component 50 can be fixed to the handle body via these mechanisms.

[0104] Figure 14 This is a cross-sectional view illustrating other embodiments of the medical device related to the present invention. For example... Figure 14 As shown, the medical device 1 may further include an outer cylinder member 50 having a length direction and a linear body 60. By arranging the inner cylinder member 20 within a ring formed by the linear body 60, the intracorporeal catheter 10 is connected to the outer cylinder member 50. This allows force applied from the hand side to be easily transmitted to the intracorporeal catheter 10 through the outer cylinder member 50, facilitating the easy pushing of the intracorporeal catheter 10 distally and delivery of the intracorporeal catheter 10 to the affected area. When the medical device 1 includes the outer cylinder member 50, this outer cylinder member 50 is preferably positioned outside the inner cylinder member 20 at a position closer to the proximal end 10a of the intracorporeal catheter 10. In this case, the outer cylinder member 50 is preferably configured to be movable relative to the length direction of the inner cylinder member 20.

[0105] The outer cylinder component 50 may also have a through hole 72 on the side wall of its distal portion. The distal portion of the outer cylinder component 50 refers to the region extending 60 mm in length from the distal end of the outer cylinder component 50 towards the proximal side. The indwelling tube 10 may also have a through hole 71 on the side wall of its proximal portion. The linear body 60 may also be configured as a closed ring passing through the through hole 72 of the outer cylinder component 50, in which a portion 51 of the distal end of the outer cylinder component 50, located distal to the through hole 72, is disposed. The ring of the linear body 60 passes through the through hole 71 of the indwelling tube 10, and an inner cylinder component 20 is disposed within the ring. In this case, a portion 14 of the proximal end of the inner cylinder component 20 is not disposed within the ring of the linear body 60. Figure 14 To facilitate understanding of the positional relationship between the linear body 60 and the inner cylinder component 20, the portion of the linear body 60 present on the surface of the paper is indicated by dashed lines. With this configuration, even after the intracorporeal catheter 10 has been delivered to the affected area, the intracorporeal catheter 10 can be moved proximally by pulling the inner cylinder component 20 and the outer cylinder component 50, thus facilitating positioning during placement. Furthermore, by inserting the linear body 60 through the through-hole 71 of the intracorporeal catheter 10 and the through-hole 72 of the outer cylinder component 50, the connection between the intracorporeal catheter 10 and the outer cylinder component 50 using the linear body 60 can be easily established. Additionally, the linear body 60 is configured as a closed ring, with the inner cylinder component 20 disposed inside the ring; thereby, by pulling out the inner cylinder component 20 from the ring, the connection between the intracorporeal catheter 10 and the outer cylinder component 50 can be easily disengaged. Therefore, it is easy to place the intracorporeal catheter 10 in the affected area.

[0106] The diameter (wire diameter) of the wire body 60 can be, for example, 0.05mm~0.8mm or 0.05mm~0.5mm. In addition, the wire body 60 can be a single wire or a stranded wire.

[0107] As the thread body 60, for example, a suture can be used. By using the thread body 60 as a suture, the durability of the thread body 60 can be maintained, and the thread body 60 is a soft thread, so the thread body 60 is less likely to damage the indwelling tube 10 in the biological body, the tube wall of the biological lumen, etc.

[0108] The material constituting the line body 60 is not particularly limited, and can include natural fibers, metals, resins, etc., with resins being preferred. Examples of natural fibers include cotton, linen, silk, and wool. Examples of metals include gold, platinum, and titanium. Examples of resins include polyamide resins such as nylon; polyether polyamide resins; polyimide resins; polyester resins such as polyethylene terephthalate (PET); polyurethane resins; polyolefin resins such as polyethylene and polypropylene; fluorinated resins such as polytetrafluoroethylene (PTFE), perfluoroalkoxyalkylene (PFA), and ethylene-tetrafluoroethylene copolymer (ETFE); polyvinyl chloride resins; silicone resins; and natural rubber. Only one type of resin can be used, or two or more types can be used in combination. Among these, polyamide resins, polyester resins, polyurethane resins, polyolefin resins, and fluorinated resins are preferred.

[0109] The indwelling tube 10 can also be used as a plastic tube stent placed in the bile duct or pancreatic duct.

[0110] When the indwelling catheter 10 is placed in the bile duct, and the side of the indwelling catheter 10 positioned on the duodenal side is designated as the proximal side, and the opposite side (gallbladder side or liver side) is designated as the distal side, the distal end 10b of the indwelling catheter 10 can be positioned on either the gallbladder side or the liver side. When the distal end 10b of the indwelling catheter 10 is positioned on the liver side, a portion of the distal end of the indwelling catheter 10 can also be placed within the hepatic duct.

[0111] The length of the indwelling tube 10 in the biological body is not particularly limited, and can be, for example, 30mm to 400mm. In addition, the length of the indwelling tube 10 in the biological body refers to the length of the central axis of the indwelling tube 10 when viewed from above.

[0112] There is no particular limitation on the maximum outer diameter of the indwelling tube 10 in the body, for example, it can be 5 Fr ~ 11 Fr (about 1.7 mm ~ about 3.7 mm).

[0113] The indwelling catheter 10 in the body may also have a narrowing region at its distal end, where the outer diameter decreases toward the distal end 10b. By forming a narrowing region at the distal end of the indwelling catheter 10 in the body, it is easier to insert the distal end of the indwelling catheter 10 into a narrow or occluded part of the lumen of the body.

[0114] As the resin material constituting the inner cylinder component 20, known resins can be used, such as polyamide resins like nylon; polyether polyamide resins; polyimide resins; polyester resins like polyethylene terephthalate (PET); polyurethane resins; polyolefin resins like polyethylene and polypropylene; fluorinated resins like polytetrafluoroethylene (PTFE), perfluoroalkoxyalkylene (PFA), and ethylene-tetrafluoroethylene copolymer (ETFE); polyvinyl chloride resins; silicone resins; and natural rubber. Only one type can be used, or two or more types can be used in combination. Among these, polyamide resins, polyester resins, polyurethane resins, polyolefin resins, and fluorinated resins are preferred.

[0115] The inner cylinder component 20 can be a single-layer structure or a multi-layer structure, but a single-layer structure is preferred. A single-layer structure allows for easy manufacturing. In the case of a multi-layer structure, the resin materials constituting each layer can be the same or different.

[0116] The inner tube component 20 can be a single tube from its proximal end to its distal end, or it can be a tube composed of multiple tubes joined together. By being composed of multiple tubes, the bending stiffness of the inner tube component 20 can be varied along its length. For example, by making the material of the tube constituting the distal portion of the inner tube component 20 less hard than the material of the tube constituting the proximal portion, an inner tube component 20 with low bending stiffness in the distal portion and high bending stiffness in the proximal portion can be formed. The low bending stiffness in the distal portion of the inner tube component 20 improves the followability of the guidewire. The high bending stiffness in the proximal portion of the inner tube component 20 improves the pushing performance. The distal portion of the inner tube component 20, for example, refers to the region from the distal end 20b of the inner tube component 20 to a position 50% of its length relative to the length direction of the inner tube component 20. The proximal portion of the inner tube component 20, for example, refers to the region from the proximal end 20a of the inner tube component 20 to a position 50% of its length relative to the length direction of the inner tube component 20.

[0117] As the resin material constituting the outer cylinder component 50, known resins can be used, such as polyamide resins like nylon; polyether polyamide resins; polyimide resins; polyester resins like polyethylene terephthalate (PET); polyurethane resins; polyolefin resins like polyethylene and polypropylene; fluorinated resins like polytetrafluoroethylene (PTFE), perfluoroalkoxyalkylene (PFA), and ethylene-tetrafluoroethylene copolymer (ETFE); polyvinyl chloride resins; silicone resins; and natural rubber. Only one type can be used, or two or more types can be used in combination. Among these, polyamide resins, polyester resins, polyurethane resins, polyolefin resins, and fluorinated resins are preferred.

[0118] The outer cylinder component 50 can be a single-layer structure or a multi-layer structure, but a single-layer structure is preferred. A single-layer structure allows for easy manufacturing. In the case of a multi-layer structure, the resin materials constituting each layer can be the same or different.

[0119] The outer cylinder component 50 can be a single tube from its proximal end to its distal end, or it can be a tube composed of multiple tubes joined together. By being composed of multiple tubes, the bending stiffness of the outer cylinder component 50 can be varied along its length. The distal portion of the outer cylinder component 50, for example, refers to the region extending from its distal end to a position equal to 50% of its length along its length. The proximal portion of the outer cylinder component 50, for example, refers to the region extending from its proximal end to a position equal to 50% of its length along its length.

[0120] The resin material constituting the outer cylinder component 50 and the resin material constituting the inner cylinder component 20 may be the same or different.

[0121] The maximum outer diameter of the outer cylinder component 50 is not particularly limited as long as it is the size at which the indwelling tube 10 in the biological body is pressed in from the proximal side to the distal side. It can be larger than, the same as, or smaller than the maximum outer diameter of the indwelling tube 10 in the biological body, but it is preferred to be the same as it.

[0122] This application claims a benefit based on priority of Japanese Patent Application No. 2023-150941, filed on September 19, 2023. The entire contents of the description of the aforementioned Japanese Patent Application No. 2023-150941 are incorporated herein by reference.

[0123] Explanation of reference numerals in the attached figures

[0124] 1…Medical device; 9…Guidewire; 10…Intracellular catheter; 10a…Proximal end of intracellular catheter; 10b…Distal end of intracellular catheter; 11…Central axis; 12…Imaginary circle; 13…Clamping wing; 14…Part of the proximal end of the inner cylinder component; 16…Through hole; 17…X-ray non-transmissive marker; 20…Inner cylinder component; 20a…Proximal end of the inner cylinder component; 20b…Distal end of the inner cylinder component; 20c…Distal end of the large outer diameter region of the inner cylinder component; 22…Outer diameter expansion region; 23…Inner diameter expansion region; 24…Cone; 25…Small outer diameter region of the inner cylinder component; 2 6… Large outer diameter region of the inner cylinder component; 50… Outer cylinder component; 51… Part of the distal end of the outer cylinder component, located distal to the through hole of the outer cylinder component; 60… Linear body; 71, 72… Through hole; CD1… Maximum outer diameter at the distal end of the inner cylinder component; CD2… Outer diameter of the inner cylinder component; Cd1… Inner diameter at the distal end of the inner cylinder component; Sd1, Sd2… Inner diameter of the indwelling tube in the biological body; a, b, c… Points on the central axis of the indwelling tube in the biological body; o… Center of the imaginary circle; x… Point on the imaginary circle; A… Arc portion; B… Non-arc portion; C… Distal arc portion; D… Proximal arc portion.

Claims

1. A medical tool comprising: a living body indwelling tube having a length direction and having a proximal end and a distal end; and an inner tube member disposed in an inner lumen of the living body indwelling tube, having a length direction and having a proximal end and a distal end, the medical tool characterized in that the living body indwelling tube has a circular-arc portion curved in a circular-arc shape, and a non-circular-arc portion located on a proximal side of the circular-arc portion, the inner tube member is disposed in at least a portion of the non-circular-arc portion, and is not disposed in the circular-arc portion.

2. The medical tool according to claim 1, characterized in that the living body indwelling tube has a proximal side circular-arc portion at a position on a proximal side of the circular-arc portion, and the inner tube member is disposed in the proximal side circular-arc portion.

3. The medical tool according to claim 1, characterized in that the circular-arc portion of the living body indwelling tube is configured to be in a closed ring shape when viewed from above.

4. The medical tool according to claim 1, characterized in that the inner tube member has an outer diameter expansion region in which an outer diameter increases toward the distal end at a distal end portion of the inner tube member.

5. The medical tool according to claim 1, characterized in that the inner tube member has an inner diameter expansion region in which an inner diameter increases toward the distal end at a distal end portion of the inner tube member.

6. The medical tool according to claim 1, characterized in that the inner tube member has a tapered portion in which an outer diameter decreases toward the distal end at a distal end portion of the inner tube member.

7. The medical tool according to claim 1, characterized in that the inner tube member has an X-ray non-transmission marker at a distal end portion of the inner tube member.

8. The medical tool according to claim 1, characterized in that the inner tube member has a small outer diameter region having an outer diameter smaller than an inner diameter at the proximal end of the living body indwelling tube, and a large outer diameter region located on a proximal side of the small outer diameter region and having an outer diameter larger than the inner diameter at the proximal end of the living body indwelling tube, the small outer diameter region and the large outer diameter region being arranged in the length direction of the inner tube member.

9. The medical tool according to claim 1, characterized in that the living body indwelling tube has a through hole in a side wall of the living body indwelling tube.

10. The medical tool according to claim 1, characterized in that the living body indwelling tube has a locking tab on an outer side surface of a proximal end portion and / or an outer side surface of a distal end portion of the living body indwelling tube.

11. The medical tool according to claim 1, characterized in that the living body indwelling tube is a plastic tube stent indwelled in a bile duct or a pancreatic duct.

12. The medical tool according to claim 1, characterized in that the medical tool further comprises an outer tube member having a length direction, and a thread body, the outer tube member is disposed outside the inner tube member at a position on a proximal side of the proximal end of the living body indwelling tube, and is movable relative to the length direction of the inner tube member, the outer tube member has a through hole in a side wall of a distal portion of the outer tube member, the living body indwelling tube has a through hole in a side wall of a proximal portion of the living body indwelling tube, The string body is configured as a ring closed by the through hole of the outer tube member, and a portion of the distal end of the outer tube member at a distal side from the through hole of the outer tube member is disposed in the ring, The ring of the string body passes through the through hole of the in-vivo leaving tube, and the inner tube member is disposed in the ring.

Images