JP7398570B2 - Ligation device - Google Patents

Description

The present disclosure relates to ligation devices.

Ligation devices are known for ligating affected areas such as diverticula and varicose veins formed in the gastrointestinal tract of a patient. This type of ligation device is disclosed in Patent Document 1, for example. In the ligation kit disclosed in Patent Document 1, the endoscope is fixed to a mounting tube fixed to the proximal end of the inner tube. The mounting tube is made of a material having appropriate flexibility and sealing properties, such as soft plastic or rubber.

Japanese Patent Application Publication No. 7-59786

However, in the ligation kit disclosed in Patent Document 1, since the mounting tube is in close contact with the outer peripheral surface of the endoscope, it is not easy to remove the ligation kit from the endoscope after use.

The present disclosure aims to provide a ligating device that can be easily removed from an endoscope.

A ligation device according to one aspect of the present disclosure includes a first cylindrical body, a second cylindrical body connected to a proximal end of the first cylindrical body, and configured to be detachable from a distal end of an endoscope. a slider having a cylindrical shape, mounted on the outer periphery of the first cylindrical body, and movable relative to the first cylindrical body along its longitudinal direction; and mounted on the outer periphery of the first cylindrical body; A ligation ring that is movable relative to the first cylindrical body together with the slider, and the second cylindrical body has a weak portion whose strength is lower than other portions.

The tube further includes a tube, at least a portion of which is joined to the fragile portion of the second cylindrical body, and configured through which a fluid for pushing the slider to move the slider relative to the second cylindrical body pulls the tube. The second cylindrical body may be configured such that a part of the second cylindrical body is broken by the weakened portion when the second cylindrical body is separated from the second cylindrical body.

The fragile portion has a recess or a hole formed on the outer peripheral surface of the second cylinder along the longitudinal direction of the second cylinder, and the tube has a recess or a hole formed along the longitudinal direction of the second cylinder. and may be fixed to the recess or the hole with resin.

The fragile portion may have a slit formed along the longitudinal direction of the second cylindrical body, and the tube may be arranged along the slit and fixed to the slit with resin.

According to the present disclosure, it is possible to provide a ligation device that can be easily removed from an endoscope.

It is a longitudinal cross-sectional view showing the ligation device in a state where the slider is located on the proximal end side. It is a longitudinal cross-sectional view showing the ligation device in a state where the slider is advanced. FIG. 3 is an end view of the joining member viewed from the proximal end side. FIG. 6 is an explanatory diagram of the operation of removing the ligation device from the endoscope. FIG. 3 is an explanatory diagram of how the bonding member tears. FIG. 7 is an end view of a joining member according to a modified example, viewed from the proximal end side. FIG. 7 is an end view of a joining member according to a modified example, viewed from the proximal end side. FIG. 7 is a longitudinal cross-sectional view of a joining member according to a modification. FIG. 7 is a longitudinal cross-sectional view of a joining member according to a modification. FIG. 7 is a longitudinal cross-sectional view of a joining member according to a modification. FIG. 7 is an end view of a joining member according to a modified example, viewed from the proximal end side. 8 is an explanatory diagram of a joining process of joining a tube to the joining member of FIG. 7. FIG. It is a longitudinal cross-sectional view of a state in which a ligation device according to a modification is attached to an endoscope. FIG. 7 is an end view of a joining member according to a modified example, viewed from the proximal end side. FIG. 7 is an end view of a joining member according to a modified example, viewed from the proximal end side. It is a figure which looked at the joining member concerning a modification from the weak part side.

Embodiments of the present disclosure will be described below with reference to the drawings. Note that the dimensions of the ligating device shown in the drawings are schematic dimensions to facilitate understanding of the implementation details, and do not necessarily correspond to the actual dimensions.

FIGS. 1A and 1B are longitudinal cross-sectional views showing a ligation device 1 attached to an endoscope 2 according to the present embodiment. FIG. 1A shows a state in which a slider 40, which will be described later, is located on the proximal end side, and FIG. 1B shows a state in which the slider 40 is advanced.

1A and 1B only show the distal end of the endoscope 2 with the ligating device 1 attached thereto. Note that only a slider piece 45 of the slider 40 is illustrated. Furthermore, for convenience, the endoscope 2 is shown in its external appearance, and is not shown as a cross-sectional view (the same applies to subsequent drawings).

In FIGS. 1A and 1B, the left side is the tip side (distal side) inserted into the body, and the right side is the proximal side (proximal side, proximal side). The endoscope 2 is formed with a forceps hole 2a through which forceps (not shown) are inserted.

The ligation device 1 includes an inner cylinder 10, a joining member 20, an outer cylinder 30, a slider 40, a seal member 50, ligation rings 60, 61, and 62, and a tube 70. The inner cylinder 10 corresponds to a first cylinder, and the joining member 20 corresponds to a second cylinder.

The inner cylinder 10 is located at the endoscope tip 2b, and is attached to the endoscope tip 2b in an air-tight or liquid-tight state. The inner cylinder 10 has a base end 11, an intermediate part 12, and a distal end 13. The base end portion 11 is thinner than the intermediate portion 12 and has a smaller outer diameter. An annular convex portion 14 that projects outward is provided on the outer periphery of the base end portion 11 .

The intermediate portion 12 is located on the distal end side of the base end portion 11. An annular projection 16 that projects inward is provided on the inner circumferential surface 15 of the intermediate portion 12 . The tip of the endoscope distal end portion 2b comes into contact with the protrusion 16 in the longitudinal direction.

The distal end portion 13 is located on the distal end side of the intermediate portion 12. The distal end portion 13 projects further toward the distal end than the distal end surface 2c of the endoscope 2. The distal end portion 13 has a tapered shape that tapers toward the distal end side, and has an inclined surface 17 . A recess space 18 is formed by the distal end portion 13 and the distal end surface 2c of the endoscope 2.

The material constituting the inner cylindrical body 10 is not particularly limited, and may be, for example, a metal material, a resin material, or a ceramic material. Examples of metal materials include stainless steel, titanium, nickel-titanium alloys, and the like. Examples of resin materials include polyethylene, polypropylene, polyvinyl chloride, polystyrene, acrylic resin, phenol resin, melamine resin, polyimide, polyamide, polycarbonate, polyether sulfone, polyether ether ketone, and polytetrafluoroethylene. Can be mentioned. Examples of ceramic materials include glass, fine ceramics, and the like.

The material constituting the inner cylinder 10 has the strength to withstand the ligation rings 60, 61, and 62 to which the inner cylinder 10 is attached as described later, and is also biocompatible. It can be anything. Further, the material constituting the inner cylinder 10 may be a translucent material (for example, polypropylene, polycarbonate, polyether sulfone, polyimide, acrylic resin, etc.) in order to maintain a wide field of view during treatment.

The joining member 20 is a member for fixing the ligation device 1 to the endoscope 2, and is attached to the outer periphery of the endoscope 2.

FIG. 2 is an end view of the joining member 20 viewed from the proximal end side.

As shown in FIGS. 1A and 2, the joining member 20 has a cylindrical shape and is made of an elastic material. The joining member 20 has a base end 21 and a distal end 22. When no external force is applied to the joining member 20, the inner diameter of the joining member 20 is smaller than the outer diameter of the proximal end portion 11 of the inner cylindrical body 10. The distal end portion 22 of the joining member 20 is attached to the proximal end portion 11 of the inner cylindrical body 10 in a circumferentially expanded state. More specifically, the joining member 20 has a distal end 22 covering the outer periphery of the proximal end 11 of the inner cylinder 10 and a proximal end 21 of the joining member 20 covering the base of the inner cylinder 10. It is attached to the proximal end 11 of the inner cylinder 10 in a state located closer to the proximal end than the end 11 .

The endoscope 2 is inserted into the proximal end 21 and the inner cylinder 10 with the proximal end 21 of the joining member 20 extended. Therefore, the proximal end portion 21 of the joining member 20 comes into close contact with the outer peripheral surface of the endoscope 2 due to its elastic force, and fixes the ligation device 1 to the endoscope 2.

The joining member 20 is formed with a weakened portion 25 having a recessed portion 24 extending in the longitudinal direction and having a substantially rectangular cross section. The recess 24 is formed in the outer circumferential surface 23 of the joining member 20. The weakened portion 25 is thinner than the other portions of the bonded member 20 in the cross section of the bonded member 20, so the strength of the weakened portion 25 is lower than the other portions of the bonded member 20. As shown in FIGS. 1A and 1B, a portion of a tube 70, which will be described later, is inserted into the recess 24 along the recess 24 and fixed to the joining member 20 with an adhesive (resin). In other words, a portion of the tube 70 is adhered (joined) to the fragile portion 25. Note that a part of the tube 70 may not be inserted into the recess 24, but may be placed so as to cover the recess 24, and may be adhered to the fragile portion 25 with an adhesive (resin).

The material constituting the joining member 20 is not particularly limited as long as it has the strength and biocompatibility to fix the ligation device 1 to the endoscope 2 so that it will not come off, and may be as described above. Elastic materials such as , natural rubber, synthetic rubber or thermoplastic elastomer can be used. Examples of synthetic rubber include isoprene rubber, butadiene rubber, styrene-butadiene rubber, nitrile rubber, butyl rubber, ethylene-propylene rubber, acrylic rubber, fluororubber, and silicone rubber. Examples of thermoplastic elastomers include styrene elastomers, olefin elastomers, polyester elastomers, polyurethane elastomers, and polyamide elastomers.

The adhesive is not particularly limited as long as it has the strength and biocompatibility to prevent the tube 70 from separating from the fragile portion 25 when a tensile force is applied to the tube 70. For example, an acrylic resin adhesive, Examples include urethane resin adhesives, epoxy resin adhesives, vinyl chloride resin solvent adhesives, cyanoacrylate adhesives, silicone adhesives, and phenolic resin adhesives.

The outer cylindrical body 30 has an outer cylindrical portion 31 provided on the outer periphery of the intermediate portion 12 of the inner cylindrical body 10 and an outer cylindrical lid 32 . A slide space 19 is formed between the inner cylinder 10 and the outer cylinder 30.

An annular convex portion 33 that protrudes inward is provided at the tip of the outer cylinder portion 31 . The convex portion 33 and the intermediate portion 12 form an annular opening 34 through which the slide space 19 opens. The outer cylinder lid 32 is bonded to the base end of the outer cylinder part 31 with an adhesive. A distal end surface on the inner peripheral side of the outer cylinder lid 32 is fixed to a base end portion of the intermediate portion 12 of the inner cylinder body 10. The outer cylinder lid 32 closes the base end side of the slide space 19. A through hole 35 communicating with the slide space 19 is formed in the outer cylinder lid 32 . The tip of the outer cylindrical portion 31 is arranged at approximately the same position as the protrusion 16 of the inner cylindrical body 10 in the longitudinal direction.

The material constituting the outer cylindrical body 30 is not particularly limited as long as it has the strength to withstand fluid pressure and biocompatibility as described below; for example, the materials exemplified as the material for the inner cylindrical body 10 may be used. can be used. Further, the material for the adhesive is not particularly limited as long as it has strength to withstand fluid pressure and biocompatibility, and may be the same as the adhesive for fixing the tube 70 to the joining member 20 described above. Adhesives can be used.

The slider 40 has a cylindrical shape, is provided between the inner cylindrical body 10 and the outer cylindrical body 30, and is attached to the outer periphery of the inner cylindrical body 10 along the longitudinal direction in an airtight or liquid-tight state. It is mounted so that it can move relative to 10. Specifically, the slider 40 can slide on the outer circumferential surface of the intermediate portion 12 of the inner cylinder 10 toward the distal end portion 13 or the proximal end portion 11. The distance between the slider 40 and the inner cylindrical body 10 at the distal end and/or base end of the slider 40 is smaller than the thickness of ligation rings 60, 61, and 62, which will be described later. The length of the slider 40 in the longitudinal direction is approximately equal to the length of the outer cylinder portion 31 of the outer cylinder body 30.

The slider 40 has a cylindrical portion 41 and a flange portion 42. Three annular grooves 44a, 44b, and 44c are formed in the inner circumferential surface 43 of the cylindrical portion 41 at predetermined intervals along the longitudinal direction. The dimensions of the annular grooves 44a, 44b, and 44c are such that they can accommodate ligation rings 60, 61, and 62, which will be described later. As shown in FIGS. 1A and 1B, as the slider 40 moves relative to the inner cylinder 10 along the longitudinal direction, the annular grooves 44a, 44b, and 44c of the slider 40 move from the slide space 19 to the tip end. 13, forward and backward movement is performed. When the slider 40 is located at the most distal end side, the flange portion 42 contacts the convex portion 33, and the slider 40 is prevented from slipping out of the slide space 19.

The slider 40 is composed of two slider pieces obtained by dividing the cylindrical slider 40 in half along a plane including a central axis extending in the longitudinal direction of the slider 40. By bonding the slider pieces to each other with an adhesive, the two slider pieces are integrated to form the slider 40.

The material constituting the slider 40 is not particularly limited as long as it has excellent sliding properties with the inner cylindrical body 10 and is biocompatible, and the materials exemplified as the material for the inner cylindrical body 10 may be used. be able to. The material constituting the slider 40 may be a translucent material (for example, polypropylene, polycarbonate, polyethersulfone, polyimide, acrylic resin, etc.) in order to maintain a wide field of view during treatment. Further, the material for the adhesive is not particularly limited as long as it has strength to withstand fluid pressure and biocompatibility, and for example, adhesives similar to those described above can be used.

The seal member 50 has an annular shape and is provided so as to be able to move within the slide space 19 along the longitudinal direction while contacting the inner periphery of the outer cylindrical portion 31 and the outer periphery of the inner cylindrical body 10 . That is, the seal member 50 can move while sliding on the inner circumferential surface of the outer cylinder portion 31 and the outer circumferential surface of the inner cylinder body 10. Further, the seal member 50 is fixed to the base end portion of the slider 40 so as to be movable together with the slider 40. Thereby, the space surrounded by the seal member 50, the outer cylinder lid 32, the inner cylinder body 10, and the outer cylinder part 31 is kept airtight. The material constituting the sealing member 50 is not particularly limited as long as it allows the space to be airtight and is biocompatible. For example, the materials exemplified as the material for the joining member 20 may be used. can.

The ligation rings 60, 61, and 62 are O-rings, and are attached to the outer periphery of the inner cylinder 10 and located within the annular grooves 44a, 44b, and 44c. The materials constituting the ligation rings 60, 61, and 62 may be made of materials that are sufficiently stretchable to be attached to the inner cylinder 10, have sufficient ligating force to cause necrosis of the affected area, and are biocompatible. There is no particular limitation, and for example, the materials exemplified as the material for the joining member 20 can be used. The ligation rings 60, 61, and 62 may be made of, for example, gold, platinum, tungsten, an alloy containing these elements (such as a platinum-nickel alloy), or barium sulfate, bismuth subcarbonate, or trioxide. It may also contain radiopaque materials such as bismuth, bismuth oxychloride, bismuth subcarbonate, or powders of these radiopaque materials. The longitudinal cross-sectional shape of the ligation rings 60, 61, and 62 (the shape that appears in the cross section along the longitudinal direction of the inner barrel 10 when attached to the outer periphery of the inner barrel 10) is not limited to a circular shape, but may be rectangular. Other shapes may also be used. The color of the ligation rings 60, 61, and 62 is preferably a color such as black that stands out from the surrounding tissue.

The tube 70 extends along the endoscope 2 from its distal end to its proximal end. A syringe (not shown) is connected to the base end of the tube 70 for sending a gaseous fluid such as air to the slider 40 . The tip of the tube 70 is connected to the base end of the through hole 35 of the outer cylinder lid 32 in an airtight manner. As described above, a portion of the distal end of the tube 70 is inserted into the recess 24 of the joining member 20 and adhered to the recess 24 with an adhesive.

The material constituting the tube 70 is not particularly limited as long as it has flexibility and biocompatibility that can follow the deformation of the endoscope 2, and examples thereof include polyethylene, polypropylene, polyvinyl chloride, and fluororesin. etc.

Next, an example of how the ligating device 1 is used will be described. Here, a method for ligating a diverticulum formed on the wall of the gastrointestinal tract will be described as an example.

First, as shown in FIG. 1A, with the entire slider 40 positioned in the slide space 19, the endoscope 2 equipped with the ligating device 1 is inserted into the gastrointestinal tract to observe the inside of the gastrointestinal tract. A bleeding diverticulum is identified, the endoscope 2 and ligation device 1 are brought close to the diverticulum, and the diverticulum is suctioned through the forceps hole 2a, so that the diverticulum becomes convex toward the endoscope 2. The diverticulum is then inverted into the recessed space 18. As shown in FIG. 1B, a syringe (not shown) is operated to discharge fluid toward the slider 40 through the tube 70. The fluid applies pressure to the base end side of the seal member 50 fixed to the base end of the slider 40, and uses the pressure as a driving source to move the slider 40 and the seal member 50 forward. The fluid is accumulated in a space formed between the seal member 50, the outer cylinder part 31, the intermediate part 12 of the inner cylinder body 10, and the outer cylinder lid 32 as the slider 40 and the seal member 50 move forward, Pressure is continued to be applied to the proximal end side of the seal member 50. As a result, the slider 40 moves toward the distal end of the inner cylindrical body 10, and the ligation ring 60 located at the distal end moves toward the distal end portion 13. As a result, the ligating ring 60 moves the inclined surface 17 of the distal end 13 toward the distal end while reducing its diameter, and separates from the distal end 13, so that the ligating ring 60 ligates the sucked diverticulum. Next, the endoscope 2 equipped with the ligation device 1 is removed from the gastrointestinal tract. Thereafter, the ligated diverticulum becomes necrotic and is expelled from the body together with the ligation ring 60.

FIG. 3 is an explanatory diagram of the operation of removing the ligation device 1 from the endoscope 2. FIG. 4 is an explanatory diagram of how the joining member 20 is torn.

When removing the ligating device 1 from the endoscope 2 after using the ligating device 1, as shown in FIG. , the weakened portion 25 is separated from the other portions of the joining member 20 and peeled off. At this time, as shown in FIG. 4, a breaking slit 26 is formed along the long axis direction in a portion of the joining member 20 corresponding to the fragile portion 25, and the joining state of the joining member 20 to the endoscope 2 is released. Ru. Thereby, the ligation device 1 can be easily removed from the endoscope 2.

According to the ligating device 1 of this embodiment, the joining member 20 has the weak portion 25 whose strength is lower than other parts, so the ligating device 1 attached to the endoscope 2 can be removed after use. At this time, the ligation device 1 can be easily removed from the endoscope 2 by breaking the joining member 20 via the weakened portion 25. Therefore, the surgeon or the like can immediately start the next task and proceed with the procedure efficiently.

Further, in this embodiment, when the tube 70 is pulled and separated from the joining member 20, a part of the joining member 20 is broken due to the fragile portion 25, so that the joining member 20 is easily broken. The ligation device 1 can be easily removed from the endoscope 2.

Further, in this embodiment, the recess 24 is formed on the outer peripheral surface 23 of the joining member 20 along the longitudinal direction of the joining member 20, and the tube 70 is arranged along the recess 24 and fixed to the recess 24 with resin. has been done. Therefore, the joining member 20 can be reliably broken along the longitudinal direction, and the ligation device 1 can be easily removed from the endoscope 2.

Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to these embodiments, and various modifications are possible.

For example, in the above embodiment, as shown in FIG. 2, the recess 24 of the fragile portion 25 has a substantially rectangular cross section, but as shown in FIG. 5A, the recess 24a has a substantially V-shaped cross section. It may be. Although the recess 24 of the fragile portion 25 is formed on the outer peripheral surface 23 of the joining member 20, the recess 24b may be formed on the inner peripheral surface 27 of the joining member 20, as shown in FIG. 5B. Furthermore, the recesses 24 (24a and 24b) may be formed on both the outer circumferential surface 23 and the inner circumferential surface 27.

As shown in FIG. 1, the recess 24 of the fragile portion 25 is formed from one end to the other end of the joining member 20 in the longitudinal direction. The recess 24c may be formed only on the proximal end, the recess 24d may be formed only on the distal end, and the recess 24e may be formed only on the intermediate part. Furthermore, a plurality of recesses may be formed at regular intervals along the longitudinal direction. Moreover, instead of being formed by the recess 24, the fragile portion 25 may be formed by forming a plurality of holes penetrating the side surface of the joining member 20 at regular intervals along the longitudinal direction in a so-called perforation shape. Note that the distance between the holes does not have to be constant.

Although the fragile portion 25 was configured by the recess 24, as shown in FIG. 7, it may also be configured by a slit 28 extending along the longitudinal direction. Note that the width of the slit 28 can be set as appropriate. In the joining member 20 in which the slit 28 is formed, the tube 70 is joined to the joining member 20, for example, by a joining process shown in FIG. In FIG. 8, the upper part shows a top view of the joining member 20, and the lower part shows an end view of the joining member 20. In FIG. 8, the joining members 20 arranged vertically are in the same step in the joining process, and the joining process progresses in the order of (a) to (d).

First, the slit 28 of the bonding member 20 shown in FIG. 8(a) is filled with an adhesive 29A, and the slit 28 is closed with the adhesive 29A as shown in FIG. 8(b). Subsequently, as shown in FIG. 8(c), the tube 70 is placed on the adhesive 29A along the longitudinal direction. As shown in FIG. 8(d), the tube 70 is coated with the adhesive 29B, and the entire tube 70 is coated with the adhesives 29A and 29B. In this way, the tube 70 is joined to the joining member 20. The material for the adhesives 29A and 29B is not particularly limited as long as it is biocompatible, and adhesives similar to those described above can be used.

In this way, the slit 28 is formed along the longitudinal direction of the joining member 20, and the tube 70 is arranged along the slit 28 and fixed to the slit 28 with resin. That is, the fragile portion 25 is composed of the slit 28 and a resin member filled in the slit 28. Further, a tube 70 is joined (adhered) to this resin member. Therefore, the joining member 20 can be more reliably broken along the longitudinal direction, and the ligation device 1 can be easily removed from the endoscope 2.

In the above embodiment, the tube 70 is bonded to the fragile portion 25, but as shown in FIG. 70 may not be bonded to the fragile portion 25. Therefore, in FIG. 9, only the weakened portion 25 is illustrated, and the tube 70 is not illustrated. As shown in FIGS. 9 and 10, the fragile portion 25 includes a resin layer 25A in the recess 24 thereof. The rear end portion 25B of the resin layer 25A projects further rearward than the rear end of the joining member 20 and functions as a grip portion for the operator to grip.

In the example shown in FIGS. 9 and 10, when removing the ligation device 1 from the endoscope 2, the operator grasps the rear end portion 25B, which is the grip portion, and applies a tensile force to the resin layer 25A. . As a result, the fragile portion 25 is separated from the other portions of the joining member 20 and peeled off. At this time, a breaking slit 26 (see FIG. 4) is formed along the long axis direction in a portion of the joining member 20 corresponding to the fragile portion 25, and the joining state of the joining member 20 to the endoscope 2 is released. . Even in this case, the ligation device 1 can be easily removed from the endoscope 2.

Note that the rear end portion 25B, which is a grip portion, may not be provided. In this case, the operator pinches the resin layer 25A on the recess 24 with his fingers and pulls it off, thereby forming the breaking slit 26 and releasing the bonding state of the bonding member 20 to the endoscope 2. Further, as shown in FIGS. 11A and 11B, the fragile portion 25 may have a configuration in which the slit 28 includes a resin layer 25A and a rear end portion 25B.

Further, although there are three ligation rings in the above embodiment, it is sufficient to have one or more ligation rings. Furthermore, although the fluid that drives the slider 40 is a gas such as air, it may also be a liquid such as physiological saline. Note that as the ligation ring, for example, a ring-shaped member made of a shape memory alloy can be used. When such a ring-shaped member leaves the annular groove of the slider, its shape changes from circular to non-circular, so that ligation can be performed according to the shape of the affected area. Furthermore, a clip made of a shape memory alloy can also be used as the ligation ring. Such a clip is ring-shaped when housed in the annular groove of the slider, and deforms into a pre-memorized shape when removed from the annular groove of the slider.

1: Ligation device 2: Endoscope 10: Inner cylinder 20: Joining member 24, 24a, 24b, 24c, 24d, 24e: Recessed portion 25: Weak portion 25A: Resin layer 25B: Rear end portion 28: Slit 29A~ 29B: Adhesive 40: Slider 60, 61, 62: Ligation ring 70: Tube

Claims (4)

a first cylindrical body;
a second cylindrical body connected to the proximal end of the first cylindrical body and configured to be detachable from the distal end of the endoscope;
a slider that has a cylindrical shape, is attached to the outer periphery of the first cylindrical body, and is movable relative to the first cylindrical body along its longitudinal direction;
a ligating ring attached to the outer periphery of the first cylindrical body and movable relative to the first cylindrical body together with the slider;
The second cylindrical body has a weak portion with lower strength than other portions,
A ligation device , wherein at least a portion of the second cylindrical body is ruptured by the weakened portion . Further comprising a tube, at least a portion of which is joined to the fragile portion of the second cylindrical body, and configured through which a fluid for pushing and relatively moving the slider passes;
The ligating device according to claim 1, wherein when the tube is pulled and separated from the second cylinder, at least a portion of the second cylinder is broken by the weakened portion. The fragile portion has a recess or a hole formed on the outer peripheral surface of the second cylinder along the longitudinal direction of the second cylinder,
The ligation device according to claim 2, wherein the tube is arranged along the recess or the hole and is fixed to the recess or the hole with a resin. The fragile portion has a slit formed along the longitudinal direction of the second cylindrical body,
The ligation device according to claim 2, wherein the tube is arranged along the slit and fixed to the slit with resin.

Images