Stopper for endoscopic treatment aid and endoscopic treatment aid using same

Abstract

To provide a stopper for an endoscope treatment auxiliary, which can prevent incorrect operation of the endoscope treatment auxiliary.SOLUTION: A stopper 100 for an endoscope treatment auxiliary comprises: a sheath side locking part 103 locked on an outer tubular sheath 3; an operation side locking part 105 locked on an operation part 6; and a connection part 107 connecting the sheath side locking part 103 and the operation side locking part 105. At least one of the sheath side locking part 103 and the operation side locking part 105 is configured to freely release locking. The sheath side locking part 103 is locked on the outer tubular sheath 3, and in a locked state in which the operation side locking part 105 is locked on the operation part 6, prevents the operation part 6 from moving forward relatively to the outer tubular sheath 3.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a stopper for an endoscopic treatment auxiliary tool used in an endoscopic treatment auxiliary tool, and to an endoscopic treatment auxiliary tool using the same. [Background technology]

[0002] Conventionally, an endoscopic treatment auxiliary device has been known which comprises an outer cylindrical sheath, an inner cylindrical sheath inserted into the outer cylindrical sheath, a linear member disposed within the inner cylindrical sheath with its tip protruding from the inner cylindrical sheath, and an operating section which allows the inner cylindrical sheath to move forward and backward relative to the outer cylindrical sheath, the linear member having a ring-shaped portion at its tip protruding from the inner cylindrical sheath (see, for example, Patent Document 1).

[0003] This endoscopic treatment auxiliary tool is attached to the endoscopic clipping device by inserting the endoscopic clipping device into the annular portion provided at the distal end of the linear member and operating the operating portion to narrow (constrict) the size of the annular portion. After grasping the lesion, the endoscopic clipping device is detached from the endoscope.

[0004] Because this endoscopic treatment auxiliary tool is attached to the endoscopic clip device by the annular portion, when the endoscopic clip device is separated from the endoscope, the inner tubular sheath and the linear member can be pulled toward the proximal end by the operating portion, or the outer tubular sheath can be advanced relative to the inner tubular sheath by the operating portion until it comes into contact with the endoscopic clip device and pushes the endoscopic clip device toward the distal end.

[0005] As a result, this endoscopic treatment auxiliary tool makes it possible to secure a visual field under the endoscope while immobilizing the affected area. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2018-153254 Summary of the Invention [Problem to be solved by the invention]

[0007] Conventionally, if the operating portion of an endoscopic treatment auxiliary tool is operated incorrectly, there is a risk that the endoscopic treatment tool will fall off the tip of the endoscopic treatment auxiliary tool, so it has been necessary to use the tool carefully. In view of the above, it is an object of the present invention to provide a stopper for an endoscope auxiliary tool that can prevent erroneous operation of an endoscope treatment auxiliary tool, and an endoscope treatment auxiliary tool using the same. [Means for solving the problem]

[0008] [1] In order to achieve the above object, the stopper for an endoscopic treatment auxiliary tool of the present invention comprises: A stopper for an endoscopic treatment auxiliary tool used in an endoscopic treatment auxiliary tool, The endoscopic treatment auxiliary tool includes: an engaging portion that can be engaged with an endoscopic treatment tool; an outer cylindrical sheath that can be advanced and retracted so that the engagement portion can be protruded from the tip; an operating portion connected to a base end of the engaging portion and exposed rearward from the base end of the outer cylindrical sheath; Equipped with The endoscopic treatment auxiliary tool includes: By retracting the operating portion relatively to the outer cylindrical sheath, a part of the engaging portion is housed in the outer cylindrical sheath, and the engaging portion is engaged with the endoscopic treatment tool. It is something The stopper for the endoscopic treatment auxiliary tool is a sheath-side locking portion that is locked to the outer cylindrical sheath; an operating side locking portion that is locked to the operating portion; a connecting portion that connects the sheath side locking portion and the operation side locking portion; Equipped with At least one of the sheath side locking portion and the operation side locking portion is configured to be releasable, In a locked state in which the sheath-side locking portion is locked to the outer cylindrical sheath and the operating-side locking portion is locked to the operating portion, the operating portion is prevented from advancing relatively to the outer cylindrical sheath. death, By releasing the lock of at least one of the sheath-side locking portion and the operating-side locking portion and keeping the other in a locked state, the operating portion is allowed to move forward relatively to the outer cylindrical sheath. It is characterized by:

[0009] According to the present invention, by retracting the operating portion relative to the outer tubular sheath, a part of the engaging portion is housed within the outer tubular sheath and the engaging portion is engaged with the endoscopic treatment tool, and a stopper for the endoscopic treatment aid is attached to the endoscopic treatment aid, so that the sheath side engaging portion is engaged with the outer tubular sheath and the operating side engaging portion is engaged with the operating portion, thereby maintaining the engaging portion of the endoscopic treatment aid engaged with the endoscopic treatment tool.

[0010] This allows the stopper for the endoscopic treatment auxiliary tool to prevent the operating portion from unintentionally moving forward relative to the outer tube sheath, thereby preventing the engagement between the endoscopic treatment tool and the engagement portion of the endoscopic treatment auxiliary tool from being unintentionally released.

[0011] [2] Furthermore, the sheath-side locking portion and the operating-side locking portion of the stopper for an endoscopic treatment auxiliary tool of the present invention may both be configured to be releasable.

[0012] According to the present invention, since both the sheath side locking portion and the operating side locking portion are configured to be freely released from the lock, the present invention can be used with existing endoscopic treatment auxiliary devices without requiring any design changes to the endoscopic treatment auxiliary device.

[0013] [3] In addition, in the endoscopic treatment aid of the present invention, a gripping portion having a diameter larger than that of the outer cylindrical sheath is provided at a proximal end of the outer cylindrical sheath; An annular groove is formed on the outer circumferential surface of the gripping portion, The sheath side locking portion is fitted into the annular groove and is locked to the outer cylindrical sheath via the grip portion.

[0014] According to the present invention, by retracting the operating portion relative to the outer tubular sheath, a part of the engaging portion is housed within the outer tubular sheath and the engaging portion is engaged with the endoscopic treatment tool, and a stopper for the endoscopic treatment aid is attached to the endoscopic treatment aid, so that the sheath side engaging portion is engaged with the outer tubular sheath and the operating side engaging portion is engaged with the operating portion, thereby maintaining the engaging portion of the endoscopic treatment aid engaged with the endoscopic treatment tool.

[0015] This allows the stopper for the endoscopic treatment auxiliary tool to prevent the operating portion from unintentionally moving forward relative to the outer tube sheath, thereby preventing the engagement between the endoscopic treatment tool and the engagement portion of the endoscopic treatment auxiliary tool from being unintentionally released.

[0016] [4] In the present invention, it is preferable that the sheath-side locking portion is provided with a rattle prevention portion along the outer peripheral surface of the grip portion in addition to a protrusion that fits into the annular groove.

[0017] According to the present invention, the sheath side locking portion has a rattle prevention portion that fits along the outer peripheral surface of the grip portion, so that the stopper for an endoscopic treatment auxiliary can be prevented from rattling relative to the endoscopic treatment auxiliary.

[0018] [5] In the stopper for an endoscopic treatment auxiliary tool of the present invention, the connecting portion may be configured to be narrower in width than the sheath-side locking portion or the operating-side locking portion.

[0019] [6] In the present invention, an anti-slip portion may be provided.

[0020] [7] In the present invention, the sheath-side locking portion or the operation-side locking portion may be configured in a bifurcated shape and may include a retaining portion.

[0021] [8] In the present invention, the sheath-side locking portion or the operating-side locking portion may be configured to have a thickness that gradually increases toward the tip. [Brief explanation of the drawings]

[0022] [Figure 1] FIG. 1 is an explanatory view showing a stopper for an endoscopic treatment auxiliary tool according to a first embodiment of the present invention. [Figure 2] FIG. 2 is an explanatory view showing a partial cross section of the endoscopic treatment auxiliary tool of this embodiment. [Figure 3] FIG. 3 is an explanatory view showing another embodiment of the endoscopic treatment auxiliary tool. [Figure 4] FIG. 4 is an explanatory diagram showing how to use the endoscopic treatment auxiliary tool of this embodiment. [Figure 5] FIG. 5 is an explanatory diagram showing a method of using the endoscopic treatment tool of this embodiment. [Figure 6] FIG. 6 is an explanatory view showing a stopper for an endoscopic treatment auxiliary tool according to this embodiment. [Figure 7] FIG. 7 is an explanatory view showing a state in which the sheath-side locking portion of the stopper for an endoscopic treatment auxiliary of this embodiment is fitted to the grip portion of the endoscopic treatment auxiliary. [Figure 8] FIG. 8 is an explanatory view showing a stopper for an endoscopic treatment auxiliary tool according to a second embodiment of the present invention. [Figure 9] FIG. 9 is an explanatory view showing a stopper for an endoscopic treatment auxiliary according to a third embodiment of the present invention. [Figure 10] FIG. 10 is an explanatory view showing a stopper for an endoscopic treatment auxiliary tool according to a fourth embodiment of the present invention. [Figure 11] FIG. 11 is an explanatory view showing an engagement state between the operation side locking portion of the stopper for an endoscopic treatment auxiliary and the operation portion of the endoscopic treatment auxiliary according to the fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0023] A stopper for an endoscopic treatment auxiliary tool according to a first embodiment of the invention will be described with reference to the drawings.

[0024] As shown in Figures 1 and 2, an endoscopic treatment auxiliary tool 1 equipped with a stopper for an endoscopic treatment auxiliary tool of this embodiment includes an outer cylindrical sheath 3 having a hollow cylindrical gripping portion 2 at its base end, an inner cylindrical sheath 4 inserted into the outer cylindrical sheath 3, a linear member 5 disposed within the inner cylindrical sheath 4, and an operating portion 6 that is slidable along the inner surface of the gripping portion 2.

[0025] The gripping portion 2 has a larger diameter than the outer cylindrical sheath 3 and is formed from, for example, acrylonitrile-butadiene-styrene copolymer resin (ABS resin), and the outer cylindrical sheath 3 is formed from a tube made of a rigid material such as polyethylene resin.

[0026] The inner cylindrical sheath 4 is formed of a material such as tetrafluoroethylene resin that has excellent sliding properties relative to the outer cylindrical sheath 3, and is integrally provided with a linear member 5 made of polyamide resin or the like inside. The base ends of the inner cylindrical sheath 4 and the linear member 5 are connected to the tip side of an operating unit 6, which is an operating means, within the gripping unit 2. The linear member 5 also has a ring-shaped portion 7 at the tip end protruding from the inner cylindrical sheath 4.

[0027] The operating part 6 is made of, for example, ABS resin and includes a sliding part 6a that is cylindrical and has its tip end disposed inside the grip part 2, and a lever part 6b that is connected to the base end of the sliding part 6a outside the grip part 2 and forms a T shape as a whole. A silicone rubber O-ring 6c is provided between the sliding part 6a and the inner peripheral surface of the grip part 2.

[0028] The linear member 5 may have a single circular annular portion 7 as shown in FIG. 3A, or may have a circular first annular portion 7a provided on the base end side and a circular second annular portion 7b provided on the tip end side and having a smaller diameter than the first annular portion 7a as shown in FIG. 3B, in which the second annular portion 7b is connected to the tip end side of the first annular portion 7a on the base end side.

[0029] 3C, the distal end of the linear member 5 may be knotted backward, and the portion beyond the knot 5a may form a looped portion 7. In this case, the knot 5a may be knotted in any manner as long as it is slidable along the length of the linear member 5. In this embodiment, the looped portion 7 corresponds to the engaging portion of the endoscopic treatment auxiliary tool 1.

[0030] Next, a method of using the endoscopic treatment auxiliary tool 1 of this embodiment will be described.

[0031] As shown in Fig. 4, when using the endoscopic treatment auxiliary tool 1, first, the annular portion 7 is attached to the clip device 11. The clip device 11 is connected to the tip of an insertion portion (not shown) that is inserted into a forceps channel (not shown) of an endoscope, and includes an outer tube 12 and a clip main body 13 provided at the tip of the outer tube 12. In this embodiment, the clip device 11 corresponds to the endoscopic treatment tool.

[0032] The clip body 13 includes a pair of arms 14a, 14b, each made of, for example, a leaf spring, which are biased in directions away from each other, and gripping portions 15a, 15b provided at the distal ends of the arms 14a, 14b. The arms 14a, 14b are connected at their base ends, and by moving the outer tube 12 toward the distal end as shown by the imaginary line in Fig. 4A, the arms 14a, 14b are moved toward each other, and the lesion or the like is gripped between the gripping portions 15a, 15b.

[0033] When attaching the single circular annular portion 7 shown in Fig. 3A to the clip device 11, first, as shown in Fig. 4A, one of the arm portions 14a, 14b, for example, the arm portion 14a, is inserted into the annular portion 7. Next, by pulling the lever portion 6b, as shown in Fig. 4B, the outer cylindrical sheath 3 is advanced relatively to the inner cylindrical sheath 4 and the linear member 5 so as to abut against the arm portion 14a, while the distal end of the outer cylindrical sheath 3 serves as a storage portion, and the inner cylindrical sheath 4 and the annular portion 7 are stored in the storage portion, thereby constricting the annular portion 7 and fixing it to the arm portion 14a.

[0034] In the endoscopic treatment aid 1 of this embodiment, the operation of attaching the annular portion 7 to the clip device 11 can be performed outside the body before the endoscope is inserted into the body cavity, but the endoscopic treatment aid 1 can also be grasped with the grasping forceps of the endoscope and inserted into the body cavity, or the annular portion 7 can be engaged with a cover member attached to the tip of the endoscope and inserted into the body cavity, and after endoscopically guiding it to the vicinity of the affected area, the annular portion 7 can be attached to the clip device 11.

[0035] Furthermore, if the operation of attaching the annular portion 7 to the clipping device 11 is performed outside the body before the endoscope is inserted into the body cavity, it is preferable to insert the clipping device 11 and the linear member 5 including the annular portion 7 attached to the clipping device 11 into the body cavity while they are housed in the endoscopic hood and guide them to the vicinity of the affected area. This makes it possible to prevent the clipping device 11 from accidentally damaging tissues, etc., inside the body cavity.

[0036] Next, as shown in Figure 5A, the endoscopic treatment auxiliary tool 1 with the clip device 11 attached to the annular portion 7 is inserted together with the endoscope E into the digestive tract, such as the esophagus, and guided to the vicinity of the lesion L. The digestive tract generally consists of three layers, namely, the mucosa, the submucosa, and the muscular layer, in that order from the body cavity side, and the lesion L is in the mucosa.

[0037] When excising the lesion L, first, markings are made around the lesion L, and then local injection into the submucosal layer is performed to make the lesion L bulge like a polyp. Then, the mucosa around the lesion L is incised along the markings using a high-frequency knife K or the like provided in the forceps channel of the endoscope E. Figure 5A shows the state in which the mucosa around the lesion L has been incised.

[0038] Next, the submucosal layer below the lesion L is incised with a high-frequency knife K to dissect the lesion L from the submucosal layer. However, as the dissection progresses, the mobility of the lesion L increases, narrowing the field of view under the endoscope E, particularly obstructing the view of the area to be dissected. Therefore, the clipping device 11 is brought close to the lesion L, and then the outer tube 12 is moved toward the distal end, thereby grasping the lesion L between the grasping portions 15a, 15b of the arms 14a, 14b, as shown in FIG. 5B . Once the lesion L is grasped by the clipping device 11, the clipping device 11 is then separated from the endoscope E. The clipping device 11 can be separated from the endoscope E, for example, by providing a fragile portion between the proximal end of the clipping device 11 and the insertion portion, and then pulling the insertion portion toward the proximal end to break the fragile portion.

[0039] The clip device 11 separated from the endoscope E can be operated by the annular portion 7 attached to the arm portion 14a with the endoscopic treatment auxiliary tool 1. Therefore, as shown in Fig. 5C, by operating the endoscopic treatment auxiliary tool 1 to pull the lesion L in a direction away from the endoscope E, the field of view of the endoscope E can be secured while the lesion L can be fixed, making it easy to incise the submucosal layer with the high-frequency knife K.

[0040] Furthermore, since the rigid outer cylindrical sheath 3 of the endoscopic treatment auxiliary tool 1 is abutted against the arm portion 14a of the clip device 11, as shown in Figure 5D, it is possible to move the entire outer cylindrical sheath 3 toward the tip as needed and push the clip device 11 toward the tip, thereby moving the lesion L from the tip of the endoscope E to the back of the body cavity.

[0041] After this, once the incision of the submucosal layer below the lesion L is completed and the lesion L is peeled off, the peeled off lesion L can be removed and collected from the body by operating the endoscopic treatment auxiliary tool 1.

[0042] In this embodiment, the annular portion 7 is constricted when the endoscopic treatment auxiliary tool 1, in which the clip device 11 is attached to the annular portion 7, is inserted together with the endoscope E into a digestive tract such as the esophagus, but doing so may cause the inner cylindrical sheath 4 to interfere with the tip of the endoscope E. Therefore, the annular portion 7 may be constricted after the endoscopic treatment auxiliary tool 1 is inserted together with the endoscope E into a digestive tract such as the esophagus and guided to the vicinity of the lesion L without constricting the annular portion 7.

[0043] 5B, after the clipping device 11 is separated from the endoscope E, the endoscopic treatment auxiliary tool 1 is grasped with the grasping forceps of the endoscope and inserted into the body cavity as described above, and after endoscopically guiding it to the vicinity of the affected area, when attaching the annular portion 7 to the clipping device 11, the annular portion 7 may be attached to the base end of the clipping device 11 separated from the endoscope E, instead of attaching it to the arm portion 14a. The operation of attaching the annular portion 7 to the base end of the clipping device 11 can be performed in the same manner as when attaching the annular portion 7 to the arm portion 14a.

[0044] Next, a description will be given of a stopper for an endoscopic treatment auxiliary according to a first embodiment. As shown in Fig. 1, the stopper 100 for an endoscopic treatment auxiliary includes a sheath-side locking portion 103 that is locked to the outer cylindrical sheath 3, an operation-side locking portion 105 that is locked to the operation portion 6, and a connecting portion 107 that connects the sheath-side locking portion 103 and the operation-side locking portion 105.

[0045] The sheath-side locking portion 103 is configured as a circular through-hole and is locked to the grip portion 2 of the outer cylindrical sheath 3, and the operating-side locking portion 105 is configured in a bifurcated fork shape so that it can be freely released from the locking with the operating portion 6. In this embodiment, when the operating-side locking portion 105 is in a locked state where it is locked to the operating portion 6, the operating portion 6 is prevented from moving forward relatively with respect to the outer cylindrical sheath 3.

[0046] An annular groove 2a is formed on the outer peripheral surface of the gripping portion 2. The sheath side locking portion 103 is fitted into this annular groove 2a and is locked to the outer cylindrical sheath 3 via the gripping portion 2. The sheath side locking portion 103 is provided with a protrusion 103a that protrudes annularly radially inward to fit into the annular groove 2a, as well as an annular rattle prevention portion that extends along the outer peripheral surface of the gripping portion 2.

[0047] According to the stopper 100 for an endoscopic treatment auxiliary tool of this embodiment, by retracting the operating portion 6 relative to the outer tubular sheath 3, a part of the annular portion 7 (engagement portion) is housed within the outer tubular sheath 3 and the annular portion 7 (engagement portion) is engaged with the clip device 11 (endoscopic treatment tool), and the stopper 100 for an endoscopic treatment auxiliary tool is provided on the endoscopic treatment auxiliary tool 1, and by establishing an engaged state in which the sheath side engaging portion 103 is engaged with the outer tubular sheath 3 via the gripping portion 2 and the operating side engaging portion 105 is engaged with the operating portion 6, the annular portion 7 (engagement portion) of the endoscopic treatment auxiliary tool 1 can be maintained in an engaged state with the clip device 11 (endoscopic treatment tool).

[0048] This allows the stopper 100 for the endoscopic treatment auxiliary tool to prevent the operating portion 6 from unintentionally moving forward relative to the outer tube sheath 3, thereby preventing the engagement between the clip device 11 (endoscopic treatment tool) and the annular portion 7 (engagement portion) of the endoscopic treatment auxiliary tool 1 from being unintentionally released.

[0049] Furthermore, according to the stopper 100 for an endoscopic treatment auxiliary device of this embodiment, the sheath side locking portion 103 has a rattle prevention portion 103b that fits along the outer peripheral surface of the gripping portion 2. Therefore, as shown in area X in Figure 7A, the inner peripheral surface of the rattle prevention portion 103b comes into surface contact with the outer peripheral surface of the gripping portion 2, thereby firmly holding it in place and preventing the stopper 100 for an endoscopic treatment auxiliary device from rattling relative to the endoscopic treatment auxiliary device.

[0050] Figure 7B shows a comparative example in which no rattle prevention portion is provided. As shown in area Y in Figure 7B, the sheath-side locking portion 103 comes into point contact with the outer edge of the annular groove 2a of the gripping portion 2, causing rattle. Note that the stopper for an endoscopic treatment auxiliary of the present invention does not need to be provided with a rattle prevention portion, and even with this, the effect of preventing unintentional release of engagement between the clip device (endoscopic treatment tool) and the annular portion (engagement portion) of the endoscopic treatment auxiliary can be obtained.

[0051] In the stopper 100 for an endoscopic treatment auxiliary tool of the first embodiment, only the operating side locking portion 105 is configured in a bifurcated fork shape so that the locking with the operating portion 6 can be released, and the locking with the sheath side locking portion 103 and the gripping portion 2 cannot be released.

[0052] However, the stopper for an endoscopic treatment aid of the present invention is not limited to this. For example, as shown in a second embodiment of the present invention in FIG. 8, the stopper may be configured in a bifurcated fork shape so that the operating side locking portion 105 cannot be released from the locking with the operating portion 6, and only the sheath side locking portion 103 can be freely released from the locking with the gripping portion 2.

[0053] Alternatively, for example, as shown in a third embodiment of the invention in Fig. 9, both the sheath side locking portion 103 and the operating side locking portion 105 may be configured in a bifurcated fork shape so that they can be released. According to the stopper 100 for an endoscopic treatment aid of this third embodiment, both the sheath side locking portion 103 and the operating side locking portion 105 are configured to be able to be released, and the sheath side locking portion 103 can also be configured to fit into the sliding portion 6a of the operating section 6 and be locked with the base end edge of the gripping section 2. This eliminates the need to provide an annular groove 2a in the endoscopic treatment aid 1, and allows it to be used with existing endoscopic treatment aids 1 without changing the design of the endoscopic treatment aid 1.

[0054] A fourth embodiment of a stopper for an endoscopic treatment auxiliary according to the present invention will be described with reference to Figures 10 and 11. In the stopper 100 for an endoscopic treatment auxiliary according to the fourth embodiment, the width of a connecting portion 107 is smaller than the width of a sheath-side locking portion 103 and an operating-side locking portion 105. The portion where the sheath-side locking portion 103 and the operating-side locking portion 105 are connected to the connecting portion 107 is configured so that the width gradually decreases from the sheath-side locking portion 103 and the operating-side locking portion 105 toward the connecting portion 107.

[0055] Anti-slip portions 109 consisting of a plurality of protrusions are provided on the outer surfaces of the portions where the sheath side locking portion 103 and the operating side locking portion 105 are connected to the connecting portion 107. In addition, anti-slip portions 111 consisting of a pair of protrusions are provided on the portions of the bifurcated portions of the sheath side locking portion 103 and the operating side locking portion 105 that fit with the sliding portion 6a so that the sheath side locking portion 103 and the operating side locking portion 105 do not easily come off the sliding portion 6a.

[0056] 11, the sheath-side locking portion 103 and the operating-side locking portion 105 are configured to have thicknesses that increase toward the distal end. With this configuration, even when the sheath-side locking portion 103 and the operating-side locking portion 105 are fitted into the sliding portion 6a with the connecting portion bent significantly, the sheath-side locking portion 103 and the operating-side locking portion 105 are prevented from coming into partial contact with the grip portion 2 of the outer tubular sheath 3 and the lever portion 6b of the operating portion 6, as shown by the dotted lines in FIG. 11, and the sheath-side locking portion 103 and the operating-side locking portion 105 can be firmly brought into contact with the grip portion 2 of the outer tubular sheath 3 and the lever portion 6b of the operating portion 6.

[0057] The stopper 100 for an endoscopic treatment auxiliary tool of the fourth embodiment can prevent the operating portion 6 from unintentionally advancing relative to the outer cylindrical sheath 3, and can prevent the engagement between the clip device 11 (endoscopic treatment tool) and the annular portion 7 (engagement portion) of the endoscopic treatment auxiliary tool 1 from being unintentionally released.

[0058] In the fourth embodiment of the stopper 100 for an endoscopic treatment auxiliary tool, the width of the connecting portion 107 is smaller than the width of the sheath side locking portion 103 and the operating side locking portion 105. However, the stopper for an endoscopic treatment auxiliary tool of the invention is not limited to this, and for example, the width of the connecting portion 107 may be smaller than the width of either the sheath side locking portion 103 or the operating side locking portion 105.

[0059] Furthermore, in the fourth embodiment of the stopper 100 for an endoscopic treatment auxiliary tool, the stopper 111 is provided on both the sheath side locking portion 103 and the operating side locking portion 105, but the stopper for an endoscopic treatment auxiliary tool of the invention is not limited to this, and for example, the stopper 111 may be provided on only one of the sheath side locking portion 103 and the operating side locking portion 105.

[0060] Furthermore, in the fourth embodiment of the stopper 100 for an endoscopic treatment auxiliary tool, both the sheath side locking portion 103 and the operating side locking portion 105 are described as being configured to become thicker toward the tip side, but the stopper for an endoscopic treatment auxiliary tool of the invention is not limited to this, and for example, only one of the sheath side locking portion 103 and the operating side locking portion 105 may be configured to become thicker toward the tip side. [Explanation of symbols]

[0061] 1 Endoscopic treatment aids 2 Grip part 2a Annular groove 3. Outer sheath 4 Inner sheath 5 Linear members 6 Control section 6a Sliding part 6b Lever part 7 Annular part (engagement part) 11 Clipping device (endoscopic treatment tool) 100 Stopper for endoscopic treatment aid 103 Sheath side locking part 103a Protrusion 103b Anti-rattle part 105 Operating side locking portion 107 Connection 109 Anti-slip part 111 Retaining part

Claims

1. A stopper for an endoscopic treatment auxiliary tool used in an endoscopic treatment auxiliary tool, The endoscopic treatment auxiliary tool includes: an engaging portion that can be engaged with an endoscopic treatment tool; an outer cylindrical sheath that can be advanced and retracted so that the engagement portion can be protruded from the tip; an operating portion connected to a base end of the engaging portion and exposed rearward from the base end of the outer cylindrical sheath; Equipped with the endoscopic treatment auxiliary is configured to accommodate a part of the engaging portion in the outer cylindrical sheath and engage the engaging portion with the endoscopic treatment tool by retracting the operating portion relatively to the outer cylindrical sheath, The stopper for the endoscopic treatment auxiliary tool is a sheath-side locking portion that is locked to the outer cylindrical sheath; an operating side locking portion that is locked to the operating portion; a connecting portion that connects the sheath side locking portion and the operation side locking portion; Equipped with At least one of the sheath side locking portion and the operation side locking portion is configured to be releasable, In a locked state in which the sheath-side locking portion is locked to the outer cylindrical sheath and the operating-side locking portion is locked to the operating portion, the operating portion is prevented from advancing relatively to the outer cylindrical sheath, a stopper for an endoscopic treatment auxiliary device, characterized in that the operation portion is allowed to advance relatively to the outer cylindrical sheath by releasing the locking of at least one of the sheath side locking portion and the operation side locking portion and keeping the other in a locked state.

2. The stopper for an endoscopic treatment aid according to claim 1, The stopper for an endoscopic treatment auxiliary device is characterized in that the sheath side locking portion and the operation side locking portion are both configured so that the locking can be released.

3. An endoscopic treatment auxiliary tool comprising the stopper for an endoscopic treatment auxiliary tool according to claim 1 or 2, a gripping portion having a diameter larger than that of the outer cylindrical sheath is provided at a proximal end of the outer cylindrical sheath; An annular groove is formed on the outer circumferential surface of the gripping portion, The sheath-side locking portion is fitted into the annular groove and locked to the outer cylindrical sheath via the grip portion.

4. The endoscopic treatment aid according to claim 3, The endoscopic treatment auxiliary tool is characterized in that the sheath side engaging portion is provided with a protrusion that fits into the annular groove, as well as a rattle prevention portion that fits along the outer peripheral surface of the gripping portion.

5. The stopper for an endoscopic treatment aid according to claim 1 or 2, The stopper for an endoscopic treatment auxiliary device is characterized in that the connecting portion is narrower in width than the sheath side locking portion or the operation side locking portion.

6. The stopper for an endoscopic treatment aid according to claim 1, 2 or 5, A stopper for an endoscopic treatment aid, characterized in that it is provided with an anti-slip portion.

7. The stopper for an endoscopic treatment aid according to claim 1, claim 2, claim 5 or claim 6, The stopper for an endoscopic treatment auxiliary device is characterized in that the sheath side locking portion or the operation side locking portion is configured in a bifurcated shape and has a stopper portion.

8. A stopper for an endoscopic treatment auxiliary tool according to claim 1, claim 2, or claims 5 to 7, A stopper for an endoscopic treatment auxiliary device, characterized in that the sheath side locking portion or the operating side locking portion is configured so as to gradually increase in thickness toward the tip.

Images