WO2020105316A1

WO2020105316A1 - Endoscopic treatment tool and method for manufacturing same

Info

Publication number: WO2020105316A1
Application number: PCT/JP2019/040420
Authority: WO
Inventors: 尚武前久保; 岸田　学
Original assignee: 株式会社カネカ
Priority date: 2018-11-22
Filing date: 2019-10-15
Publication date: 2020-05-28
Also published as: JP7416719B2; JPWO2020105316A1

Abstract

Provided are: an endoscopic treatment tool, in which sliding performance between an outer tube and an inner tube is improved, and a treatment implement can be reliably projected from the outer tube at an intended timing; and a method for manufacturing same. The present invention has an outer tube (10) that has distal and proximal directions, an inner tube (20) disposed in a cavity inside the outer tube (10), and a wire-like object (30) disposed in a cavity inside the inner tube (20) and having, at a distal end part, a connecting part (31) that is connected to the treatment implement. The outer tube (10) is capable of moving in the distal and proximal directions relative to the inner tube (20) and exposing a distal end (20a) of the inner tube (20) from the outer tube (10). The inner tube (20) has a large outer diameter part (21) having a large diameter. A lubricating oil layer (60) is disposed between the outer tube (10) and the inner tube (20), and the lubricating oil layer (60) is not disposed in a section in which the outer diameter of the large diameter part (21) is the greatest.

Description

Endoscopic treatment tool and manufacturing method thereof

The present invention relates to an endoscopic treatment tool used for the purpose of hemostasis, collection and excision of internal tissue, injection of a drug solution into internal tissue, etc., during surgery and treatment using an endoscope.

Conventionally, in endoscopic procedures such as endoscopic submucosal dissection (ESD) and endoscopic mucosal resection (EMR), hemostasis and lesions when bleeding due to excision of lesions are performed. An endoscopic treatment tool, which is a treatment instrument such as a clip for suturing, a snare or knife for removing a lesion, forceps for collecting body tissue, a local injection needle for injecting a drug solution into body tissue, etc. Is used.

For example, Patent Document 1 describes an endoscopic treatment tool in which the watertightness of a connection portion between a needle and an inner tube attached to the needle is improved and the inner tube is slidable in the outer tube. Patent Document 2 describes an endoscopic treatment tool that includes an operation wire having an inner sheath and an outer sheath, and that improves the cleaning effect of the inner sheath and the outer sheath by a spiral structure of the inner sheath and the outer sheath. Patent Document 3 has an inner cylinder portion, an outer cylinder portion, and a slide portion, and a treatment tool at the distal end of an endoscope can be rotated by rotating a slide portion provided around the outer cylinder portion. Further, there is described an endoscopic treatment instrument capable of advancing / retreating a treatment section by operating a slide section to advance / retreat. Patent Document 4 describes an endoscope ligation tool including an inner cylinder, an outer cylinder, and a seal ring in which oil is applied between the inner cylinder and the outer cylinder.

JP, 2005-188588, A Japanese Patent Laid-Open No. 2012-200518 JP-A-2005-198868 Japanese Patent Laid-Open No. 11-056861

A treatment instrument such as a clip is attached to the tip of the endoscopic treatment instrument, and is inserted into the endoscope while being housed in the outer cylinder. When projecting the treatment instrument from the outer cylinder at a desired location, the outer cylinder and the inner cylinder are slid. For example, in the large intestine or the like, the endoscopic treatment tool is inserted through a portion having a long distance and a lot of meandering. However, in such a place, the endoscopic treatment tool is also meandering, and the outer cylinder and the inner cylinder are separated. There is a possibility that it may take a long time to project the treatment instrument or the treatment instrument may not be able to be ejected because the friction increases and sliding becomes difficult. A swift operation is required for a procedure using an endoscopic treatment tool, in particular, a procedure such as hemostasis or sewing.

The present invention has been made in view of the above circumstances, and an object thereof is to improve slidability between an outer cylinder and an inner cylinder so that a treatment instrument can be reliably projected from the outer cylinder at an intended timing. An object is to provide an endoscopic treatment tool and a manufacturing method thereof.

The present inventors have completed the present invention as a result of intensive studies to solve the above problems. That is, the gist of the present invention is as follows.
[1] An outer cylinder having a perspective direction, an inner cylinder arranged in an inner cavity of the outer cylinder, and an inner cylinder arranged in the inner cavity of the inner cylinder, and a distal end portion having a connection portion with a treatment instrument. The outer cylinder is movable in the perspective direction with respect to the inner cylinder, and the distal end of the inner cylinder can be exposed from the outer cylinder. Has a large diameter portion with a large outer diameter, a lubricating oil layer is arranged between the outer cylinder and the inner cylinder, and the lubricating oil layer is arranged in the section with the largest outer diameter of the large diameter portion. An endoscopic treatment tool characterized by the absence thereof.
[2] The lubricating oil layer is preferably arranged on both the inner surface of the outer cylinder and the outer surface of the inner cylinder.
[3] The lubricating oil layer is preferably arranged at a position not in contact with the distal end of the inner cylinder.
[4] The length from the distal end to the proximal end of the lubricating oil layer is shorter than the length from the distal end to the proximal end of the outer cylinder, and the distal end of the large diameter portion from the distal end of the inner cylinder. It is preferably shorter than the length to the edge.
[5] It is preferable that the lubricating oil layer is arranged over the entire circumference of at least one of the inner surface of the outer cylinder and the outer surface of the inner cylinder in one cross section perpendicular to the perspective direction of the outer cylinder.
[6] It is preferable that the lubricating oil layer is disposed on the proximal side of the distal end of the inner cylinder and on the distal side of the distal end of the large diameter portion in the perspective direction.
[7] The inner cylinder has a distal large-diameter portion distal to the large-diameter portion, and the lubricating oil layer is arranged closer to the proximal side than the proximal end of the distal large-diameter portion. Preferably.
[8] The lubricating oil layer is arranged on the outer surface of the inner cylinder, and the portion where the lubricating oil layer is arranged is a portion which is not exposed from the outer cylinder when the outer cylinder is moved in the perspective direction with respect to the inner cylinder. Is preferred.
[9] The inner cylinder is preferably a coil.
[10] The lubricating oil layer preferably contains silicone oil.
[11] A method for manufacturing the endoscopic treatment device according to any one of [1] to [10], further comprising: a first step of preparing an outer cylinder and an inner cylinder; It has a second step of applying a lubricating oil to the outer surface on the distal side, and a third step of inserting the proximal end of the inner cylinder from the distal end of the outer cylinder into the inner cavity of the outer cylinder. A method for manufacturing an endoscopic treatment tool.
[12] It is preferable to perform the fourth step of cleaning the distal end portion of the outer cylinder after the third step.

According to the endoscopic treatment tool of the present invention, by disposing the lubricating oil layer between the outer cylinder and the inner cylinder, it is possible to improve the slidability between the outer cylinder and the inner cylinder. Even when the mirror treatment tool is inserted into the in-vivo lumen where there are many meandering locations, a large amount of friction is unlikely to occur between the inner surface of the outer cylinder and the outer surface of the inner cylinder. The treatment instrument can be easily projected from the outer cylinder by sliding. Further, since the lubricating oil layer is not arranged in the section having the largest outer diameter of the large diameter portion, it is possible to prevent the lubricating oil layer from being exposed to the outside of the outer cylinder.

1 is a plan view of an entire endoscopic treatment tool according to an embodiment of the present invention. FIG. 2 is a schematic cross-sectional view taken along the perspective of the endoscopic treatment tool shown in FIG. 1. FIG. 3 is a sectional view taken along line III-III perpendicular to the perspective direction of the endoscopic treatment tool shown in FIG. 2.

Hereinafter, the present invention will be described more specifically on the basis of the following embodiments, but the present invention is not limited to the following embodiments as well as the present invention, and may be appropriately modified within a range compatible with the gist of the preceding and following description. In addition, it is possible to implement in addition, and all of them are included in the technical scope of the present invention. Note that, in each drawing, hatching, member reference numerals and the like may be omitted for convenience, but in such a case, the specification and other drawings are referred to. Further, the dimensions of various members in the drawings may be different from the actual dimensions because priority is given to contributing to the understanding of the features of the present invention.

1 is a plan view of an entire endoscopic treatment tool according to an embodiment of the present invention, FIG. 2 is a schematic cross-sectional view of the endoscopic treatment tool taken along the perspective direction, and FIG. 3 is an endoscopic treatment. It is sectional drawing perpendicular | vertical to the perspective direction of a tool.

As shown in FIGS. 1 to 3, an endoscopic treatment tool 1 of the present invention includes an outer cylinder 10 having a perspective direction, an inner cylinder 20 arranged in an inner cavity of the outer cylinder 10, and an inner cylinder 20. The linear object 30 which is disposed in the lumen and has a connection portion 31 with a treatment instrument at a distal end portion.

In the present invention, the proximal side refers to the hand side of the user with respect to the extending direction of the outer cylinder 10 and the inner cylinder 20, and the distal side refers to the opposite side of the proximal side, that is, the treatment target side. Further, the extending direction of the outer cylinder 10 and the inner cylinder 20 is referred to as the perspective direction. The radial direction refers to the radial direction of the outer cylinder 10 or the inner cylinder 20, the inner side in the radial direction refers to the direction toward the axial center of the outer cylinder 10 or the inner cylinder 20, and the outer side refers to the inner side in the radial direction. And points to the opposite side. 1 and 2, the right side of the figures is the proximal side, and the left side of the figures is the distal side.

The endoscopic treatment tool 1 connects the treatment instrument to the connection part 31 with the treatment instrument in the procedure using the endoscope such as ESD or EMR. The treatment instrument is used for excision of a lesion, hemostasis, suture of a lesion, collection of internal tissues, injection of a drug solution into internal tissues, and the like. Specific examples of treatment instruments include snares and knives for excising lesions, clips for hemostasis and suturing of lesions, forceps for collecting internal tissue, local injection needles for injecting drug solution into internal tissue, etc. Is mentioned.

The outer cylinder 10 is movable in the perspective direction with respect to the inner cylinder 20. That is, the outer cylinder 10 can be moved relative to the endoscopic treatment tool 1, and the positional relationship between the outer cylinder 10 and the inner cylinder 20 can be moved. For example, the outer cylinder 10 may be moved in the perspective direction without moving the inner cylinder 20, or the inner cylinder 20 may be moved in the perspective direction without moving the outer cylinder 10. Good.

The distal end 20a of the inner cylinder 20 can be exposed from the outer cylinder 10 by moving the outer cylinder 10 in the perspective direction with respect to the inner cylinder 20. By moving the outer cylinder 10 in the perspective direction with respect to the inner cylinder 20, it is possible to expose the distal end 20a of the inner cylinder 20 from the outer cylinder 10, and thus the treatment connected to the connecting portion 31. The device can be projected from the outer cylinder 10.

As shown in FIG. 2, the inner cylinder 20 has a large-diameter portion 21 having a large outer diameter, a lubricating oil layer 60 is arranged between the outer cylinder 10 and the inner cylinder 20, and the lubricating oil layer 60 is It is characterized in that it is not arranged in a section of the large diameter portion 21 having the largest outer diameter. In the endoscopic treatment tool 1, since the lubricating oil layer 60 is arranged between the outer cylinder 10 and the inner cylinder 20, the lubricating oil layer 60 enhances the slidability between the outer cylinder 10 and the inner cylinder 20, and the connecting portion. The treatment instrument connected to 31 can be easily projected from the outer cylinder 10. Further, since the lubricating oil layer 60 is not arranged in the section having the largest outer diameter of the large diameter portion 21, it is possible to prevent the lubricating oil layer 60 from being exposed to the outside of the outer cylinder 10. Therefore, a part of the exposed lubricating oil layer 60 adheres to the surface of the outer cylinder 10 or the inner cylinder 20 to deteriorate the handling, and a part of the exposed lubricating oil layer 60 adheres to the connection portion 31 to attach the treatment instrument. It is possible to prevent the operation of the endoscope treatment tool 1 from becoming difficult and easy to fall off, and to make it difficult to operate the endoscope treatment tool 1 by attaching it to the handle 50 or the like described later.

The outer cylinder 10 has a perspective direction and an inner cavity extending in the perspective direction. Further, the inner cylinder 20 is arranged in the inner cavity of the outer cylinder 10. The outer cylinder 10 is preferably capable of disposing the connecting portion 31 in the inner cavity. Since the connecting portion 31 can be arranged in the inner cavity of the outer cylinder 10, at least a part of the treatment instrument connected to the connecting portion 31 can be arranged in the outer cylinder 10. Therefore, while the treatment instrument is transported from the forceps port of the endoscope to the vicinity of the treatment target site through the forceps channel, the treatment instrument may be installed in the forceps port or the forceps channel inside the endoscope, or other than the treatment target site. It is possible to prevent damage to internal tissues and the like.

The outer cylinder 10 is preferably not fixed to another member. Since the outer cylinder 10 is not fixed to another member, when the treatment is performed using the endoscope treatment tool 1, the treatment instrument is stored in the endoscope treatment tool 1 or the endoscope treatment tool 1 is used. Exposure is performed by moving the outer cylinder 10 arranged on the outermost surface in the radial direction of the endoscopic treatment instrument 1 in the perspective direction, and thus improving the operability of the endoscopic treatment instrument 1. You can

When the outer cylinder 10 is not fixed to another member, the inner cylinder 20 is preferably fixed to another member. As a member for fixing the inner cylinder 20, for example, as shown in FIGS. 1 and 2, a handle 50 of the endoscope treatment tool 1 and the like can be cited. In the endoscope treatment tool 1, since the outer cylinder 10 is not fixed to another member but the inner cylinder 20 is fixed to another member, the outer cylinder 10 can be moved in the perspective direction with respect to the inner cylinder 20. It is easy to carry out, and it becomes easy to store and expose the treatment instrument in the endoscopic treatment instrument 1. The details of the handle 50 will be described later.

The inner cylinder 20 has a perspective direction, and has an inner cavity extending in the perspective direction. It is preferable that the linear object 30 is arranged in the inner cavity of the inner cylinder 20, and the linear object 30 is movable in the perspective direction with respect to the inner cylinder 20. Since the linear object 30 is movable in the perspective direction with respect to the inner cylinder 20, the treatment instrument connected to the connecting portion 31 can be easily operated. Specifically, when the treatment instrument is a clip, the clip 30 can be opened and closed and the degree of opening and closing can be adjusted by moving the linear object 30 in the perspective direction with respect to the inner cylinder 20.

The outer cylinder 10 and the inner cylinder 20 are, for example, a plurality of coil-shaped cylinders in which metal wires or plates are spirally wound, and a plurality of short cylinder joint pieces formed of metal or synthetic resin, which are connected in the axial direction. It is possible to have a cylindrical body that is made rotatable and a cylindrical body that is made of synthetic resin.

Examples of the metal forming the outer cylinder 10 and the inner cylinder 20 include stainless steel such as SUS304 and SUS316, platinum, nickel, cobalt, chromium, titanium, tungsten, gold, Ni—Ti alloy, Co—Cr alloy, or these. The combination of The metal forming the outer cylinder 10 and the inner cylinder 20 is preferably a Ni—Ti alloy, among others. Since the metal forming the outer cylinder 10 and the inner cylinder 20 is a Ni—Ti alloy, the outer cylinder 10 and the inner cylinder 20 can have excellent shape memory properties and high elasticity.

Examples of the resin forming the outer cylinder 10 and the inner cylinder 20 include polyamide resins such as nylon, polyolefin resins such as polyethylene and polypropylene, polyester resins such as polyethylene terephthalate (PET), and polyether ether ketone (PEEK). Such as aromatic polyether ketone resin, polyimide resin, polytetrafluoroethylene (PTFE), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA), ethylene-tetrafluoroethylene copolymer (ETFE), etc. Examples thereof include synthetic resins such as fluororesins.

The material forming the outer cylinder 10 is preferably a fluorine-based resin, and more preferably PTFE. Since the material forming the outer cylinder 10 is a fluororesin, the slidability with the inner cylinder 20 disposed in the inner cavity of the outer cylinder 10 is enhanced, and the outer cylinder 10 moves in the perspective direction with respect to the inner cylinder 20. Is easier to do. The material forming the inner cylinder 20 is preferably different from the material forming the outer cylinder 10. For example, when the material forming the outer cylinder 10 is a fluororesin, the inner cylinder 20 is formed. The material is preferably a polyolefin resin, more preferably polyethylene. Since the material forming the inner cylinder 20 is different from the material forming the outer cylinder 10, the slidability with the outer cylinder 10 can be improved, and the outer cylinder 10 and the inner cylinder 20 move in the perspective direction. Will be easier.

The material forming the outer cylinder 10 is preferably transparent or translucent. Since the material forming the outer cylinder 10 is transparent or semi-transparent, the positional relationship between the outer cylinder 10 and the inner cylinder 20 arranged in the inner cavity of the outer cylinder 10 can be visually confirmed. The operability of the endoscope treatment tool 1 can be improved.

The inner cylinder 20 is preferably a coil. Since the inner cylinder 20 is a coil, the inner cylinder 20 can be made to have a balance between rigidity and flexibility, and the endoscope treatment tool 1 can be used from the forceps port of the endoscope to the treatment target site. It is easy to insert, and it becomes easy to move the outer cylinder 10 and the inner cylinder 20 in the perspective direction and the inner cylinder 20 and the linear object 30 in the perspective direction.

The lengths of the outer cylinder 10 and the inner cylinder 20 in the perspective direction are the lengths of the linear object 30, the outer cylinder 10, and the inner cylinder 20 in the perspective direction in consideration of the distance from the forceps opening of the endoscope to the treatment target site. An appropriate length can be selected according to the size. The lengths of the outer cylinder 10 and the inner cylinder 20 in the perspective direction can be set to, for example, 1000 mm or more and 3000 mm or less.

The perspective length of the inner cylinder 20 is preferably longer than the perspective length of the outer cylinder 10. Since the length of the inner cylinder 20 in the perspective direction is longer than the length of the outer cylinder 10 in the perspective direction, the outer cylinder 10 is easily moved in the perspective direction with respect to the inner cylinder 20, and the outer cylinder 10 is excessively projected in the body. By doing so, it is possible to prevent damage to internal tissues other than the treatment target site. The length of the inner cylinder 20 in the perspective direction is preferably 1.2 times or less, more preferably 1.1 times or less, and 1.05 times the perspective length of the outer cylinder 10. The following is more preferable. By setting the upper limit value of the ratio of the perspective length of the inner cylinder 20 and the perspective length of the outer cylinder 10 in the above range, the inner cylinder 20 and the connecting portion 31 are sufficiently provided in the inner cavity of the outer cylinder 10. Can fit in. As a result, before the treatment instrument is transported to the treatment target site, it is possible to prevent the treatment instrument from easily damaging the forceps port or the forceps channel in the endoscope, the body tissue other than the treatment target site, or the like.

The sizes of the outer cylinder 10 and the inner cylinder 20 can be appropriately selected according to the size of the forceps hole of the endoscope and the size of other members of the endoscopic treatment tool 1 such as the connecting portion 31. For example, the thickness of the outer cylinder 10 and the inner cylinder 20 is preferably 100 μm or more, more preferably 150 μm or more, and further preferably 200 μm or more. By setting the lower limit values of the thicknesses of the outer cylinder 10 and the inner cylinder 20 in the above ranges, the rigidity of the outer cylinder 10 and the inner cylinder 20 can be made appropriate, and the distance between the outer cylinder 10 and the inner cylinder 20 can be reduced. It is easy to move in the direction. The thickness of the outer cylinder 10 and the inner cylinder 20 is preferably 500 μm or less, more preferably 400 μm or less, and further preferably 300 μm or less. By setting the upper limits of the thicknesses of the outer cylinder 10 and the inner cylinder 20 in the above ranges, the flexibility of the outer cylinder 10 and the inner cylinder 20 can be increased, and the forceps port of the endoscope can be moved to the treatment target site. It becomes easy to send in the endoscopic treatment tool 1.

The inner cylinder 20 has a large diameter portion 21 having a large outer diameter. That is, the outer diameter of the large diameter portion 21 is larger than the outer diameter of the portion of the inner cylinder 20 that is not the large diameter portion 21. Since the inner cylinder 20 has the large diameter portion 21, the lubricating oil layer 60 spreads closer to the proximal side than the large diameter portion 21, the lubricating oil layer 60 adheres to the handle 50 and the like, and It is possible to prevent the operation from being disturbed.

As a method of forming the large-diameter portion 21 in the inner cylinder 20, for example, a tubular member is covered at an arbitrary position of the inner cylinder 20 and the inner cylinder 20 and the tubular member are fixed with an adhesive or the like. The inner cylinder 20 is inserted into the inner cavity of the cylindrical member, and the cylindrical member is caulked to bring the inner cylinder 20 and the cylindrical member into close contact with each other. Examples include a method of bringing the tube into close contact. Above all, it is preferable to form the large diameter portion 21 by covering the inner cylinder 20 with a cylindrical member and fixing the inner cylinder 20 and the cylindrical member with an adhesive or the like. By forming the large-diameter portion 21 by covering the inner cylinder 20 with a cylindrical member and fixing the inner cylinder 20 and the cylindrical member to each other, the large-diameter portion 21 can be easily formed and the endoscope treatment tool 1 The production efficiency can be improved.

The linear object 30 has a perspective direction and has a connecting portion 31 at the distal end. The linear object 30 may have a cylindrical shape having a lumen extending in the perspective direction, but is preferably a solid shape. Since the linear object 30 is solid, the rigidity can be increased without making the outer diameter of the linear object 30 excessively large, the outer diameter of the endoscope treatment tool 1 can be made small, and the endoscope can be used. The insertability of the treatment tool 1 can be improved.

The material forming the linear object 30 is a metal wire material such as stainless steel or carbon steel, a polyamide resin such as nylon, a polyolefin resin such as PP or PE, a polyester resin such as PET, an aromatic poly resin such as PEEK. Examples thereof include synthetic resin fibers such as ether ketone resin, polyimide resin, fluorine resin such as PTFE, PFA and ETFE. Above all, the material forming the linear object 30 is preferably a stainless steel wire rod. Since the material forming the linear object 30 is a stainless steel wire material, it is possible to improve biocompatibility while providing necessary strength.

Although not shown, the linear object 30 may have a coating layer on the surface of the linear object 30. Since the linear object 30 has the coating layer, it is possible to reduce friction between the linear object 30 and the inner cylinder 20 to improve slidability, and to increase the strength of the linear object 30. It will be possible. Examples of the coating layer include fluororesins such as PTFE, PFA, ETFE, and tetrafluoroethylene / hexafluoropropylene copolymer (FEP).

As a method for forming the coating layer on the linear material 30, for example, the material for forming the coating layer may be coated on the linear material 30, and for example, a dipping method, a spray method, a fluidized bed method, a kneader coater method or the like may be used. Can be used.

The length of the linear object 30 in the perspective direction is similar to the lengths of the outer cylinder 10 and the inner cylinder 20 in the perspective direction, and the outer cylinder 10 and the inner cylinder considering the distance from the forceps port of the endoscope to the treatment target site and the like. An appropriate length can be selected according to the length of the barrel 20 in the perspective direction. The length of the linear object 30 in the perspective direction can be, for example, 1000 mm or more and 3000 mm or less.

The perspective length of the linear object 30 is preferably longer than both the perspective length of the outer cylinder 10 and the perspective length of the inner cylinder 20. Since the length of the linear object 30 in the perspective direction is longer than both the perspective length of the outer cylinder 10 and the perspective length of the inner cylinder 20, the outer cylinder 10 can move in the perspective direction with respect to the inner cylinder 20. This facilitates the operation, and prevents the outer cylinder 10 from excessively projecting inside the body and damaging internal tissues other than the treatment target site. The length of the linear object 30 in the perspective direction is preferably 1.15 times or less, more preferably 1.1 times or less the length of the inner cylinder 20 in the perspective direction, and 1.05. It is more preferable that the amount is not more than double. By setting the upper limit value of the ratio between the length of the linear object 30 in the perspective direction and the length of the inner cylinder 20 in the perspective direction, it is easy to move the linear object 30 in the perspective direction, and the connecting portion 31 is used. It becomes easy to operate the treatment instrument connected to the.

The outer diameter of the linear object 30 is preferably 100 μm or more, more preferably 200 μm or more, and further preferably 300 μm or more. By setting the lower limit value of the outer diameter of the linear object 30 within the above range, the rigidity of the linear object 30 can be increased and the insertability of the endoscopic treatment instrument 1 can be improved. The outer diameter of the linear object 30 is preferably 0.8 times or less, more preferably 0.5 times or less, and preferably 0.15 times or more of the inner diameter of the inner cylinder 20. More preferably 0.3 times or more. That is, the outer diameter of the linear object 30 is preferably in the range of 0.8 to 0.15 times the inner diameter of the inner cylinder 20, and is in the range of 0.5 to 0.3 times. Is more preferable. By setting the upper limit of the outer diameter of the linear object 30 to the above range, the outer diameter can be reduced while maintaining the rigidity of the linear object 30, and the endoscopic treatment tool 1 can be made thin. You can

The connecting portion 31 is a portion for connecting a treatment instrument to the endoscopic treatment instrument 1, and is provided at the distal end portion of the linear object 30. The connection portion 31 may be a part of the linear object 30, but is preferably a separate component for connecting the treatment instrument to the distal end portion of the linear object 30. Since the connection portion 31 is provided at the distal end portion of the linear object 30, connection of the treatment instrument to the linear object 30 and removal of the treatment instrument from the linear object 30 are facilitated, and the endoscopic treatment is performed. The treatment using the tool 1 is easy to perform, and the treatment time can be shortened.

When the connecting portion 31 is a member different from the linear object 30 arranged at the distal end portion of the linear object 30, the material forming the separate component for connecting the treatment instrument is, for example, stainless steel. , Metal such as carbon steel, polyamide resin such as nylon, polyolefin resin such as PP and PE, polyester resin such as PET, aromatic polyether ketone resin such as PEEK, polyimide resin, PTFE, PFA, Examples thereof include synthetic resins such as fluorinated resins such as ETFE. Above all, it is preferable that the material forming the separate component for connecting the treatment instrument is the same as the material forming the linear object 30. When the connecting portion 31 is a separate member from the linear object 30, the material of the connecting portion 31 and the material forming the linear object 30 are the same, so that the connection portion 31 and the linear object 30 are joined firmly. Therefore, it is possible to prevent the connecting portion 31 from coming off from the linear object 30, and it is possible to improve the durability of the endoscopic treatment tool 1.

When the connecting portion 31 is a component different from the linear object 30 arranged at the distal end of the linear object 30, a method of fixing another component for connecting the treatment instrument to the linear object 30 is described. For example, mechanical fixing with a connecting member such as screws, caulking, fitting, press fitting, welding, bonding, etc. can be used. Above all, it is preferable that the separate component for connecting the treatment instrument is fixed to the linear object 30 by welding. Since the separate component for connecting the treatment instrument is fixed to the linear object 30 by welding, the joint strength between the connecting portion 31 and the linear object 30 can be easily increased, and the endoscopic treatment instrument 1 It is possible to reduce the possibility of damage.

The outer diameter of the connecting portion 31 is preferably smaller than the inner diameter of the inner cylinder 20. That is, it is preferable that the connecting portion 31 can be arranged in the inner cavity of the inner cylinder 20. Since the outer diameter of the connecting portion 31 is smaller than the inner diameter of the inner cylinder 20, the connecting portion 31 is moved into the inner cavity of the inner cylinder 20 when the endoscope treatment tool 1 is fed from the forceps port of the endoscope to the treatment target site. Can be stored in. As a result, the connection part 31 is housed in the inner cavity of the outer cylinder 10, and the connection part 31 and the treatment instrument are prevented from damaging the forceps port or the forceps channel in the endoscope, the internal tissue other than the treatment target site, or the like. it can. In order to arrange the treatment instrument inside the outer cylinder 10, the outer diameter of the connecting portion 31 is preferably smaller than the inner diameter of the outer cylinder 10.

The lubricating oil layer 60 is arranged between the outer cylinder 10 and the inner cylinder 20. The lubricating oil layer 60 is a layer containing lubricating oil and enhances the slidability of the outer cylinder 10 and the inner cylinder 20. Examples of the lubricating oil contained in the lubricating oil layer 60 include silicone-based lubricating oil, ester-based lubricating oil, and fluorine-based lubricating oil. Above all, the lubricating oil contained in the lubricating oil layer 60 is preferably silicone oil. Since the lubricating oil layer 60 contains the silicone oil, the slidability between the outer cylinder 10 and the inner cylinder 20 can be improved for a long period of time while enhancing the safety of the endoscopic treatment instrument 1.

Although the lubricating oil layer 60 may be arranged on either the inner surface of the outer cylinder 10 or the outer surface of the inner cylinder 20, it is arranged on both the inner surface of the outer cylinder 10 and the outer surface of the inner cylinder 20. Is preferred. By disposing the lubricating oil layer 60 on both the inner surface of the outer cylinder 10 and the outer surface of the inner cylinder 20, the slidability between the inner surface of the outer cylinder 10 and the outer surface of the inner cylinder 20 can be further enhanced. This makes it easy to move the outer cylinder 10 in the perspective direction with respect to the inner cylinder 20 even in a body lumen having many meandering portions. Therefore, the treatment instrument connected to the connecting portion 31 can be easily projected from the outer cylinder 10.

The length from the distal end 60a to the proximal end 60b of the lubricating oil layer 60 is shorter than the length from the distal end 10a to the proximal end 10b of the outer cylinder 10 and is larger than the distal end 20a of the inner cylinder 20. It is preferably shorter than the length of the diameter portion 21 to the distal end 21a. By disposing the lubricating oil layer 60 in this manner, the lubricating oil layer 60 is exposed from the outer cylinder 10, and the lubricating oil adheres to the connecting portion 31 and the handle 50, so that the treatment instrument cannot be connected to the connecting portion 31. It is possible to prevent the treatment instrument from falling off easily, and prevent the treatment instrument from becoming difficult to operate.

The length of the lubricating oil layer 60 from the distal end 60a to the proximal end 60b is preferably 0.95 times or less the length from the distal end 10a to the proximal end 10b of the outer cylinder 10, and is preferably 0. It is more preferably 9 times or less, further preferably 0.85 times or less. By setting the upper limit value of the ratio of the length from the distal end 60a of the lubricating oil layer 60 to the proximal end 60b and the length from the distal end 10a to the proximal end 10b of the outer cylinder 10 to the above range, The lubricating oil layer 60 is less likely to be exposed from the outer cylinder 10. Further, the length of the lubricating oil layer 60 from the distal end 60a to the proximal end 60b is preferably 0.6 times or more the length from the distal end 10a to the proximal end 10b of the outer cylinder 10, It is more preferably 0.7 times or more, further preferably 0.8 times or more. By setting the lower limit value of the ratio of the length from the distal end 60a of the lubricating oil layer 60 to the proximal end 60b and the length from the distal end 10a to the proximal end 10b of the outer cylinder 10 to the above range, The slidability between the outer cylinder 10 and the inner cylinder 20 can be sufficiently enhanced.

The length of the lubricating oil layer 60 from the distal end 60a to the proximal end 60b is 0.9 times or less than the length from the distal end 20a of the inner cylinder 20 to the distal end 21a of the large diameter portion 21. Is more preferable, 0.85 times or less is more preferable, and 0.8 times or less is still more preferable. The upper limit of the ratio of the length from the distal end 60a to the proximal end 60b of the lubricating oil layer 60 to the length from the distal end 20a of the inner cylinder 20 to the distal end 21a of the large diameter portion 21 is set within the above range. The setting makes it difficult for the lubricating oil layer 60 to be exposed from the outer cylinder 10. The length of the lubricating oil layer 60 from the distal end 60a to the proximal end 60b is 0.3 times or more the length from the distal end 20a of the inner cylinder 20 to the distal end 21a of the large diameter portion 21. Preferably, it is 0.4 times or more, more preferably 0.5 times or more. The lower limit of the ratio of the length from the distal end 60a of the lubricating oil layer 60 to the proximal end 60b and the length from the distal end 20a of the inner cylinder 20 to the distal end 21a of the large diameter portion 21 is set within the above range. By setting it, the slidability between the outer cylinder 10 and the inner cylinder 20 can be sufficiently enhanced.

The lubricating oil layer 60 is preferably arranged at a position not in contact with the distal end 20a of the inner cylinder 20. That is, it is preferable that the distal end 60a of the lubricating oil layer 60 is located on the proximal side of the distal end 20a of the inner cylinder 20. By disposing the lubricating oil layer 60 at a position that does not contact the distal end 20a of the inner cylinder 20, the lubricating oil of the lubricating oil layer 60 is attached to the connecting portion 31 beyond the distal end 20a of the inner cylinder 20. Therefore, it is possible to prevent the treatment instrument from being difficult to connect to the connection part 31 and prevent the treatment instrument connected to the connection part 31 from falling off easily.

The lubricating oil layer 60 may be arranged on at least a part in the circumferential direction of at least one of the inner surface of the outer cylinder 10 and the outer surface of the inner cylinder 20 in one cross section perpendicular to the perspective direction of the outer cylinder 10. As shown in FIG. 3, the lubricating oil layer 60 is arranged over the entire circumference of at least one of the inner surface of the outer cylinder 10 and the outer surface of the inner cylinder 20 in a cross section perpendicular to the perspective direction of the outer cylinder 10. Is preferred. Since the lubricating oil layer 60 is arranged over the entire circumference of at least one of the inner surface of the outer cylinder 10 and the outer surface of the inner cylinder 20, friction generated between the inner surface of the outer cylinder 10 and the outer surface of the inner cylinder 20. Can be further reduced. As a result, the slidability between the outer cylinder 10 and the inner cylinder 20 can be improved.

The lubricating oil layer 60 is preferably arranged over the entire circumference of at least one of the inner surface of the outer cylinder 10 and the outer surface of the inner cylinder 20 in one cross section perpendicular to the perspective direction of the outer cylinder 10. More preferably, it is arranged over both the inner surface of the inner cylinder and the outer surface of the inner cylinder 20. By disposing the lubricating oil layer 60 over both the inner surface of the outer cylinder 10 and the outer surface of the inner cylinder 20, the slidability between the inner surface of the outer cylinder 10 and the outer surface of the inner cylinder 20 can be further enhanced. It will be possible.

The lubricating oil layer 60 is preferably arranged in the perspective direction in the proximal side of the distal end 20a of the inner cylinder 20 and in the distal side of the distal end 21a of the large diameter portion 21. By disposing the lubricating oil layer 60 on the proximal side of the distal end 20a of the inner cylinder 20 and on the distal side of the distal end 21a of the large-diameter portion 21, the lubricating oil layer 60 is disposed outside the outer cylinder 10. Therefore, it is possible to prevent the lubricating oil of the lubricating oil layer 60 from unintentionally adhering to other objects such as the connecting portion 31, and as a result, it is possible to improve the operability of the endoscopic treatment tool 1.

The inner cylinder 20 preferably has a distal large-diameter portion 23 on the distal side of the large-diameter portion 21. That is, the inner cylinder 20 preferably has the large-diameter portion 21 and the distal-side large-diameter portion 23. Further, it is preferable that the lubricating oil layer 60 is disposed closer to the proximal side than the proximal end 23b of the large diameter portion 23 on the distal side. By disposing the lubricating oil layer 60 closer to the proximal side than the proximal end 23b of the large diameter portion 23 on the distal side, the lubricating oil that constitutes the lubricating oil layer 60 spreads to the proximal side, and the proximal portion of the lubricating oil layer 60. The large diameter portion 21 prevents the end 60b from moving to the proximal side, and prevents the lubricating oil of the lubricating oil layer 60 from spreading to the distal side and moving the distal end 60a of the lubricating oil layer 60 to the distal side. The prevention of the large-diameter portion 23 on the side can prevent the lubricating oil layer 60 from being exposed from the outer cylinder 10.

The large-diameter portion 21 may be provided at an arbitrary position in the perspective direction of the inner cylinder 20, but is preferably located closer to the proximal side than the midpoint of the perspective direction of the inner cylinder 20, and the perspective of the inner cylinder 20. It is more preferable that the position is closer to the proximal side than the middle point between the midpoint of the direction and the proximal end of the inner cylinder 20. Since the large-diameter portion 21 is closer to the inner cylinder 20 than the midpoint in the perspective direction, it becomes easy to form the large-diameter portion 21 in the inner cylinder 20, and the efficiency in manufacturing the endoscopic treatment instrument 1 is improved. Can be increased.

The distal-side large-diameter portion 23 may be provided on the distal side of the large-diameter portion 21, but is located on the distal side of the large-diameter portion 21 and farther from the midpoint of the inner cylinder 20 in the perspective direction. It is preferable that the position is on the side of the inner diameter of the inner cylinder 20, and the position is on the distal side of the large diameter portion 21 and on the far side of the middle point between the perspective direction of the inner cylinder 20 and the distal end 20a of the inner cylinder 20. More preferable. The distal large-diameter portion 23 is located on the distal side of the large-diameter portion 21 and further on the distal side than the midpoint in the perspective direction of the inner cylinder 20, so that the distal-side large-diameter portion 23 is attached to the inner cylinder 20. It is easy to form and the manufacturing efficiency of the endoscopic treatment tool 1 can be improved.

When the inner cylinder 20 has the large diameter portion 21 and the distal large diameter portion 23, the distal end 60a of the lubricating oil layer 60 is closer to the proximal side than the proximal end 23b of the distal large diameter portion 23. Preferably, the proximal end 60b of the lubricating oil layer 60 is disposed more distally than the distal end 21a of the large diameter portion 21. That is, it is preferable that the lubricating oil layer 60 is not arranged on the proximal side of the proximal end of the large-diameter portion 21 and on the proximal side of the distal end of the distal-side large-diameter portion 23. The distal end 60a of the lubricating oil layer 60 is disposed closer to the proximal side than the proximal end 23b of the distal large diameter portion 23, and the proximal end 60b of the lubricating oil layer 60 is distal to the large diameter portion 21. Since the lubricating oil layer 60 is disposed on the distal side of the end 21a, it is difficult for the lubricating oil layer 60 to be exposed to the outside of the outer cylinder 10, and the lubricating oil of the lubricating oil layer 60 adheres to other objects such as the connecting portion 31 and the like. It is prevented that the operability of the mirror treatment tool 1 is deteriorated.

The lubricating oil layer 60 is arranged on the outer surface of the inner cylinder 20, and the portion where the lubricating oil layer 60 is arranged is separated from the outer cylinder 10 when the outer cylinder 10 is moved in the perspective direction with respect to the inner cylinder 20. It is preferably a portion that is not exposed. Since the lubricating oil layer 60 is arranged in a portion that is not exposed from the outer cylinder 10 when the outer cylinder 10 is moved in the perspective direction with respect to the inner cylinder 20, the outer cylinder 10 is moved in the perspective direction with respect to the inner cylinder 20. Even if the lubricating oil layer 60 spreads in the perspective direction due to the movement of the outer cylinder 10, the lubricating oil layer 60 is difficult to be exposed from the outer cylinder 10, and the lubricating oil of the lubricating oil layer 60 causes the connecting portion 31 and the handle 50, which will be described later, etc. It can be prevented from adhering to other things.

As shown in FIG. 1, the outer cylinder 10 preferably has a grip portion 40 on the outer surface. Since the outer cylinder 10 has the grip portion 40 on the outer surface, the outer cylinder 10 can be easily gripped sufficiently when the outer cylinder 10 is moved in the perspective direction with respect to the inner cylinder 20. It is possible to improve the operability of the treatment tool 1.

The grip portion 40 is preferably arranged closer to the proximal side than the midpoint of the outer cylinder 10 in the perspective direction. Since the grip portion 40 is disposed closer to the proximal side than the midpoint of the outer cylinder 10 in the perspective direction, the outer cylinder 10 is more easily gripped, and the connecting portion 31 and the treatment instrument are placed in the inner cavity of the outer cylinder 10. It is possible to easily perform the operation of storing.

The endoscopic treatment instrument 1 preferably has a handle 50. The handle 50 is a member that a user holds when operating the endoscopic treatment tool 1. The handle 50 may have a slider 52 to which the proximal end of the linear object 30 is connected and which can move in the perspective direction. Further, the handle 50 may be connected to the proximal end portion of the inner cylinder 20. The handle 50 is connected to the proximal end portion of the linear object 30 and has the slider 52 that can move in the perspective direction, so that when the treatment instrument is connected to the connection portion 31, or the connection portion. It becomes easy to move the linear object 30 in the perspective direction when the treatment instrument connected to 31 is operated, and the operability of the endoscopic treatment instrument 1 can be improved.

The method for manufacturing the endoscopic treatment tool 1 of the present invention comprises a first step of preparing the outer cylinder 10 and the inner cylinder 20, and a lubricating oil on the outer surface of the inner cylinder 20 distal to the large-diameter portion 21. It has a second step of applying and a third step of inserting the proximal end of the inner cylinder 20 from the distal end 10a of the outer cylinder 10 into the inner cavity of the outer cylinder 10.

First, the first step of preparing the outer cylinder 10 and the inner cylinder 20 is performed. A step of cleaning the inner cylinder 20 may be performed after the first step. By performing the step of cleaning the inner cylinder 20 after the first step, it becomes easier to form the lubricating oil layer 60 on the outer surface of the inner cylinder 20 in the second step.

Next, the second step of applying the lubricating oil to the inner cylinder 20 is performed. In the second step, lubricating oil is applied to the outer surface of the inner cylinder 20, which is on the distal side of the large diameter portion 21 of the inner cylinder 20. The method of applying the lubricating oil to the inner cylinder 20 includes, for example, rubbing the outer surface of the inner cylinder 20 with a cloth impregnated with the lubricating oil, dipping a brush or the like in the lubricating oil, and applying the lubricating oil to the outer surface of the inner cylinder 20. And the inner cylinder 20 is dipped in a water tank filled with lubricating oil. As a method of applying the lubricating oil to the inner cylinder 20, it is preferable to rub the outer surface of the inner cylinder 20 with a cloth soaked with the lubricating oil and apply the lubricating oil to the outer surface of the inner cylinder 20. Sliding the outer cylinder 10 and the inner cylinder 20 by rubbing the outer surface of the inner cylinder 20 with a cloth soaked with lubricating oil and applying the lubricating oil to the outer surface of the inner cylinder 20 to perform the second step. The lubricating oil layer 60 having a sufficient effect of improving the property can be efficiently formed in a short time using a small amount of lubricating oil.

Examples of the lubricating oil applied to the outer surface of the inner cylinder 20 include silicone lubricating oil, ester lubricating oil, and fluorine lubricating oil. Among them, the lubricating oil is preferably silicone oil. By using silicone oil as the lubricating oil, it is possible to provide the endoscope treatment tool 1 which is highly safe and can improve the slidability between the outer cylinder 10 and the inner cylinder 20 for a long period of time.

A step of applying lubricating oil to the inner surface of the outer cylinder 10 may be performed before or after the second step. As a method for applying the lubricating oil to the inner surface of the outer cylinder 10, for example, a cloth, string or the like impregnated with the lubricating oil is applied through the inner cavity of the outer cylinder 10, and the lubricating oil is filled in a water tank. For example, the outer cylinder 10 may be dipped. By performing the step of applying lubricating oil to the inner surface of the outer cylinder 10 before or after the second step, the lubricating oil layer 60 can be formed on the inner surface of the outer cylinder 10, and the outer cylinder 10 and the inner cylinder 20 can be formed. It is possible to further reduce the friction generated between and.

Then, a third step of inserting the proximal end of the inner cylinder 20 from the distal end 10a of the outer cylinder 10 into the inner cavity is performed. The second step and the third step may be continuously performed. Performing the second step and the third step continuously means that the proximal end portion of the inner cylinder 20 is inserted into the distal end 10a of the outer cylinder 10 and the lubricant is applied from the proximal side of the inner cylinder 20. It refers to sequentially inserting the inner cylinder 20 into the inner cavity of the outer cylinder 10. By continuously performing the second step and the third step, it is possible to shorten the time required for producing the endoscopic treatment instrument 1 and improve the production efficiency.

After the second step or after the third step, a step of arranging the linear object 30 having the connection portion 31 for the treatment instrument at the distal end portion in the inner cavity of the inner cylinder 20 may be performed. In this step, the distal end of the linear object 30, that is, the distal end of the connecting portion 31 may be inserted from the proximal end of the inner cylinder 20 into the lumen, but the proximal end of the linear object 30 may be It is preferable to insert the distal end 20a of the tube 20 into the lumen. In the step of arranging the linear object 30 having the connection portion 31 for a treatment instrument at the distal end portion in the inner cavity of the inner cylinder 20, the proximal end of the linear object 30 is indented from the distal end 20a of the inner cylinder 20. By inserting the linear object 30 into the inner cavity of the inner tube 20 by inserting it into the cavity, the production efficiency of the endoscopic treatment instrument 1 can be increased.

After the third step, the fourth step of cleaning the distal end portion of the outer cylinder 10 may be performed. When performing the third step of inserting the inner cylinder 20 coated with the lubricating oil into the inner cavity of the outer cylinder 10, the outer surface of the inner cylinder 20 and the distal end portion of the outer cylinder 10 come into contact with each other, and Lubricating oil may adhere to the distal end, and lubricating oil may adhere to other objects such as the connecting portion 31. By performing the fourth step, even if the lubricant oil has adhered to the distal end portion of the outer cylinder 10, this lubricant oil can be removed and the lubricant oil can be prevented from adhering to other objects. ..

In the fourth step, the distal end of the inner cylinder 20 may be washed together with the distal end of the outer cylinder 10. That is, the fourth step may be a step of cleaning the distal end portion of the outer cylinder 10 and the distal end portion of the inner cylinder 20. In the fourth step, by cleaning the distal end of the inner cylinder 20 together with the distal end of the outer cylinder 10, the lubricating oil has unintentionally adhered to the distal end of the inner cylinder 20. In this case, this lubricating oil can also be removed, and the adhesion of the lubricating oil to other objects can be prevented.

As described above, the endoscopic treatment tool of the present invention includes the outer cylinder having the perspective direction, the inner cylinder arranged in the inner cavity of the outer cylinder, and the inner cylinder arranged in the inner cavity of the outer cylinder. A linear object having a connection portion with a treatment instrument at an end thereof, and the outer cylinder is movable in a perspective direction with respect to the inner cylinder, and the distal end of the inner cylinder is removed from the outer cylinder. It can be exposed from the cylinder, the inner cylinder has a large diameter part with a large outer diameter, and the lubricating oil layer is arranged between the outer cylinder and the inner cylinder. It is characterized in that it is arranged on the proximal side of the distal end of the inner cylinder and on the distal side of the large diameter portion. With such a configuration of the endoscopic treatment tool of the present invention, the slidability between the outer cylinder and the inner cylinder can be improved, and the endoscopic treatment tool is inserted into a body lumen having many meanders. Even in this state, large friction is unlikely to occur between the inner surface of the outer cylinder and the outer surface of the inner cylinder, and the treatment instrument can be easily projected from the outer cylinder by sliding the outer cylinder and the inner cylinder. It is possible.

This application claims the benefit of priority based on Japanese Patent Application No. 2018-219670 filed on Nov. 22, 2018. The entire content of the specification of Japanese Patent Application No. 2018-219670 filed on Nov. 22, 2018 is incorporated herein by reference.

1: Endoscopic treatment tool 10: Outer tube 10a: Outer tube distal end 10b: Outer tube proximal end 20: Inner tube 20a: Inner tube distal end 21: Large diameter portion 21a: Large diameter portion Distal end 23: Distal side large diameter part 23b: Proximal end of distal side large diameter part 30: Linear object 31: Connection part 40: Gripping part 50: Handle 52: Slider 60: Lubricating oil layer 60a: Lubricating oil layer Distal end 60b: proximal end of lubricating oil layer

Claims

An outer cylinder having a perspective direction,
An inner cylinder arranged in the inner cavity of the outer cylinder,
Arranged in the inner cavity of the inner cylinder, and having a linear object having a connection portion with a treatment instrument at the distal end,
The outer cylinder is movable in a perspective direction with respect to the inner cylinder, and the distal end of the inner cylinder can be exposed from the outer cylinder.
The inner cylinder has a large diameter portion with a large outer diameter,
A lubricating oil layer is arranged between the outer cylinder and the inner cylinder,
The endoscopic treatment tool is characterized in that the lubricating oil layer is not arranged in a section of the large diameter portion having the largest outer diameter.
The endoscopic treatment tool according to claim 1, wherein the lubricating oil layer is disposed on both the inner surface of the outer cylinder and the outer surface of the inner cylinder.
The endoscopic treatment tool according to claim 1 or 2, wherein the lubricating oil layer is arranged at a position not in contact with the distal end of the inner cylinder.
The length from the distal end to the proximal end of the lubricating oil layer is shorter than the length from the distal end to the proximal end of the outer cylinder, and the distance from the distal end of the inner cylinder to the large diameter portion. The endoscopic treatment tool according to any one of claims 1 to 3, which is shorter than a length up to the distal end.
5. The lubricating oil layer is arranged over the entire circumference of at least one of the inner surface of the outer cylinder and the outer surface of the inner cylinder in one cross section perpendicular to the perspective direction of the outer cylinder. The endoscopic treatment tool according to one item.
6. The lubricating oil layer is arranged on the proximal side of the distal end of the inner cylinder and on the distal side of the distal end of the large-diameter portion in the perspective direction. The endoscopic treatment tool according to item.
The inner cylinder has a distal-side large-diameter portion on the distal side of the large-diameter portion,
The endoscopic treatment instrument according to any one of claims 1 to 6, wherein the lubricating oil layer is disposed closer to a proximal side than a proximal end of the distal-side large-diameter portion.
The lubricating oil layer is disposed on the outer surface of the inner cylinder,
8. The portion in which the lubricating oil layer is arranged is a portion which is not exposed from the outer cylinder when the outer cylinder is moved in the perspective direction with respect to the inner cylinder. Endoscopic treatment tool.
The endoscopic treatment instrument according to any one of claims 1 to 8, wherein the inner cylinder is a coil.
The endoscope treatment tool according to any one of claims 1 to 9, wherein the lubricating oil layer contains silicone oil.
A method for manufacturing the endoscopic treatment instrument according to any one of claims 1 to 10, comprising:
A first step of preparing the outer cylinder and the inner cylinder,
A second step of applying a lubricating oil to the outer surface of the inner cylinder distal to the large diameter portion,
A third step of inserting the proximal end of the inner cylinder from the distal end of the outer cylinder into the inner cavity of the outer cylinder, the method for manufacturing an endoscopic treatment tool.
The method for manufacturing an endoscope treatment tool according to claim 11, wherein a fourth step of cleaning the distal end portion of the outer cylinder is performed after the third step.