JP4356701B2 - O-ring wearing tool - Google Patents

Description

  The present invention relates to an O-ring mounting tool.

  In recent years, as a treatment for gastroesophageal varices originating from liver disease, instead of endoscopic sclerotherapy that uses drugs with side effects to block blood circulation and destroy varicose veins, the mechanical force of the O-ring rubber Endoscopic ligation therapy, which effectively blocks blood circulation and devastates varicose veins, has come to be widely used because of its safety and ease of procedure. In addition to the treatment of gastroesophageal varices, internal hemorrhoid ligation therapy is an example of using a ligation kit. This method is the same as gastroesophageal ligation therapy, which is a treatment that mechanically blocks blood circulation with the force of the rubber of the O-ring and destroys hemorrhoids. It is thought that it contributes to the improvement of the patient's quality of life because there is no need for hospitalization.

Here, an example of a kit for ligating an varicose vein or hemorrhoid with an O-ring endoscopically will be described.
FIG. 1 is a sectional view showing the structure of a ligation kit disclosed in Patent Document 1. The ligation kit attached to the distal end of an endoscope (6) has an O-ring attached to the inner cylinder (1). (4) is held in an expanded state. While confirming endoscopically, the slide cylinder (2) is pushed forward by air pressure to detach the O-ring (4) from the inner cylinder (1), and the root of the varicose vein or hemorrhoid is removed by the O-ring ( 4) Knot.

  Patent Document 2 discloses an O-ring mounting tool as shown in FIGS. 2 and 3 as a tool for expanding and mounting an O-ring on such a ligation kit. FIG. 2 is a top view illustrating an example of a conventional O-ring mounting tool, and FIG. 3 is a cross-sectional view taken along line A-A ′ of FIG. 2. First, as the previous stage of attaching the O-ring (4) to the ligation kit, the O-ring (4) is held in an expanded state on the outer periphery of the cylindrical member (9) inserted into the through hole of the substrate (10). When the inner cylinder (1) of the ligation kit as shown in FIG. 1 is inserted into the lumen of the cylindrical member (9) of the O-ring mounting tool from the tip, the cylindrical member (9) is pushed down. On the other hand, the O-ring (4) remains on the substrate (10). When the insertion is further advanced, the O-ring (4) is removed from the cylindrical member (9) when the heights of the top (11) of the cylindrical member (9) and the upper surface (12) of the substrate (10) become substantially the same. It moves to the inner cylinder (1) of the ligation kit and the mounting of the O-ring (4) to the ligation kit is completed.

  However, in this O-ring mounting tool, when the O-ring (4) is mounted on the ligation kit, the O-ring (4) is moved to the inner cylinder (1), and then the cylindrical member (9 ) May fall and scatter due to its own weight, and may be lost or mixed in after surgery. In order to solve this problem, Patent Document 3 discloses an O-ring mounting tool in which a tray is provided at the lower part of the cylindrical member (9) after the O-ring (4) is mounted on the ligation kit. Certainly, according to this O-ring mounting tool, scattering of the cylindrical body can be prevented, but the number of parts increases, leading to an increase in cost. Further, by either of the methods disclosed in Patent Document 2 and Patent Document 3, the O-ring (4) before the actual ligation is performed when the O-ring (4) is mounted on the ligation kit or after the O-ring (4) is mounted. Could fall out.

By these methods, there are conditions for securely mounting the O-ring (4) to the ligation kit. This condition will be described with reference to FIGS. FIG. 4 is a cross-sectional view showing an example of using a conventional O-ring mounting tool and a ligation kit, and FIG. 5 is a cross-sectional view showing an example of a problem occurring during use of a conventional O-ring mounting tool and a ligation kit. is there. Until the O-ring (4) completely shifts from the cylindrical member (9) to the inner cylinder over the entire circumference, the state in which the cylindrical member (9) and the inner cylinder (1) are fitted straight can be maintained. This is an important condition for reliable mounting of the O-ring (4). However, in reality, as shown in FIG. 4, the inner tube (1) of the ligation kit and the tubular member (9) cannot be maintained in a straight state, and the O-ring (4) is mounted. It was sometimes done. In this case, the inner cylinder (1) and the cylindrical member (9) are pulled apart with a part of the O-ring (4) remaining on the cylindrical member (9). As shown in FIG. There was a risk that (4) would fall off. Moreover, even if it was able to be mounted, since the O-ring (4) is mounted on the tip side from the predetermined position, there is a possibility that the O-ring (4) may come off before actual ligation.
JP-A-7-59786 JP 2000-262526 A JP 2005-110897 A

  The present invention has been made to solve the above-described problems, and the cylindrical body does not fall from the substrate during the treatment and is not scattered or lost, so that the O-ring is placed at a predetermined position of the inner cylinder of the ligation kit. It is an object of the present invention to provide an O-ring mounting tool that can be securely mounted.

An O-ring mounting tool according to the present invention is attached to an outer periphery of a substrate having at least one through hole, a cylindrical member slidably accommodated in the through hole, and an upper tip portion of the cylindrical member. An endoscopic ligation tool used for endoscopically ligating tissue in a body cavity by sliding the cylindrical member from an upper part to a lower part in the through-hole. The through-hole is formed with a substantially same diameter from the upper part to the lower part, and an extension part is provided toward the lower part of the through-hole. And a stopper that prevents the cylindrical member from falling off when the cylindrical member slides downward is provided from the lower inner wall surface of the extension portion toward the center of the through hole. And

  The O-ring mounting tool according to the present invention is provided with a stopper at the lower part of the through hole, so that it does not fall out of the through hole even when the cylindrical member slides downward. For this reason, a cylindrical member does not scatter around and does not obstruct an operator's operation. In addition, since a part of the inner wall for sliding through the through-hole is provided, the cylindrical member can be prevented from falling off at an angle, and the O-ligation tool can be reliably attached to the distal end. A ring can be attached.

  According to the present invention, there is provided an O-ring mounting tool that can securely mount an O-ring at a predetermined position of an inner cylinder of a ligation kit without causing a cylindrical body to fall from a substrate during scattering and to be scattered / lost. be able to.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In all the drawings, common constituent elements are denoted by the same reference numerals, and detailed description thereof will be appropriately omitted in the following description.

  As shown in FIGS. 6 and 7, the O-ring mounting tool (21) according to this embodiment is slidable in the substrate (10) having at least one through hole (20) and the through hole (20). And a cylindrical member (9), and an O-ring (4) attached to the outer periphery of the upper end portion of the cylindrical member (9). The cylindrical member (9) is passed through the through hole (20). An O-ring mounting tool for mounting an O-ring (4) to the distal end portion of an endoscopic ligation tool used for ligating tissue in a body cavity endoscopically by sliding the inner ring from the upper part to the lower part ( 21), the through hole (20) is formed with substantially the same diameter from the upper part to the lower part, and the cylindrical member (9) falls off when the cylindrical member (9) slides to the lower part. A stopper (18) is provided on the lower periphery of the through hole (20).

  The O-ring (4) is mounted on the outer periphery of the cylindrical member (9) in a state where the cylindrical member (9) is inserted into the hole of the substrate (10). At this time, in order to keep the length that the cylindrical body protrudes from the upper surface (12) of the substrate (10), a flange (9) larger than the inner diameter of the hole of the substrate (10) is provided on the lower end side of the cylindrical member (9). 15) may be provided. As a result, the cylindrical member (9) fitted with the O-ring (4) is fixed at a predetermined position and does not fall off, which is convenient for carrying. Further, by providing a protective rib (16) having a height not less than the protruding length from the upper surface (12) of the substrate (10) to the top (11) of the cylindrical member (9), the cylindrical member during transportation ( 9) It is more preferable because the risk of falling off can be further reduced.

  Further, the stopper (18) is a rib-like protrusion that extends from the inner wall surface of the through hole (20) toward the center of the through hole (20). In the present embodiment, the rib-shaped protrusion is used, but a plurality of claw-shaped protrusions may be provided as shown in FIG. 7 or may be hooked to the lower end of the tubular member (9). In this embodiment, a part of the flange (15) on the projection surface of the extension (17) is notched so that the extension (17) and the flange (15) do not interfere with each other. In addition, the inner circumference of the cylindrical body may be a step (19) or any protrusion that protrudes inward without the step (19), whether it is an inner rib or a simple protrusion. Any shape can be used.

  Next, a method of using the O-ring mounting tool (21) of the present invention will be described with reference to FIGS. 8 and 9 are sectional views showing an example of the O-ring mounting tool (21) and ligation kit of the present invention in use, and FIG. 10 shows an example of the O-ring mounting tool (21) of the present invention after use. FIG. First, the O-ring (4) is mounted on the outer periphery of the cylindrical member (9) of the O-ring mounting tool (21). When the inner tube (1) of the kit for ligation is inserted from the distal end side into the lumen of the tubular member (9) on which the O-ring (4) is set, the distal end of the inner tube (1) is placed on the inner periphery of the tubular body. The cylindrical member (9) is pushed against the step (19) provided and retracts downward. Further, at this time, an interval of about the thickness of the O-ring (4) is provided between the tip of the slide cylinder (2) and the outer cylinder (3) and the top (11) of the cylindrical member (9). This is more preferable because the O-ring (4) smoothly shifts.

  Furthermore, in the present invention, when the height of the top (11) of the cylindrical member (9) and the upper surface (12) of the substrate (10) are equal, the lower end of the cylindrical member (9) becomes the stopper (18). It catches and prevents the cylindrical body from sinking below it. For this reason, the cylindrical body is pushed forward until it hits the stopper (18), so that the height of the top portion (11) of the cylindrical member (9) and the upper surface (12) of the substrate (10) is kept equal. It becomes easy to do. That is, the O-ring (4) is easily transferred on the upper surface (12) of the substrate (10), and the O-ring (4) is completely transferred from the cylindrical member (9) to the inner cylinder (1) over the entire circumference. It is easy to maintain the state in which the cylindrical member (9) and the inner cylinder (1) are fitted straight. For this reason, the O-ring (4) is securely attached to the outer periphery of the inner cylinder (1) of the ligation kit.

  As shown in FIG. 1, the ligation kit used here is used by being attached to the distal end portion of the endoscope by means of a mounting cylinder (7), and a slide cylinder (1) around the inner cylinder (1). Although 2) retreats to the rear side, when ligating, it moves toward the distal end side by press-fitting a fluid from the tube (5), and the O-ring (4) is pushed down. The O-ring mounting tool (21) of the present invention is particularly effective for the ligation kit having such a structure, but is not limited thereto.

  The inner diameter of the hole in the substrate (10) is such that the cylindrical member (9) can slide smoothly, and the O-ring (4) can be used as a ligation kit if the O-ring (4) is not dimensioned so as not to enter the gap. It may not move smoothly. The clearance between the cylindrical member (9) and the hole of the substrate (10) is preferably 0.1 mm to 1.0 mm. Further, the inner diameter of the cylindrical member (9) is sized so that the O-ring mounting portion of the ligation kit can be smoothly inserted, and the thickness of the cylindrical member (9) is deformed when the O-ring (4) is mounted. It is necessary to select a wall thickness that has an appropriate strength in combination with the material. However, when the wall thickness is increased, the outer diameter increases, and when the O-ring (4) is mounted, the O-ring (4) may be stretched too much to contract completely. It is suitable to make it as small as possible because it does not put a burden on the O-ring (4).

  The shape of the step (19) provided on the inner periphery of the cylindrical member (9) is not particularly limited, but in order to push the cylindrical member (9) uniformly, the step (19) is at least at two locations on the inner periphery. Are preferably arranged at equal intervals or a structure having a step (19) on the entire inner periphery. Moreover, it is good also as a structure which provides two or more protrusions without making level | step difference (19). Further, the inner diameter of the step (19) needs to be smaller than the outer diameter of the inner cylinder (1) of the ligation kit in order to reliably retract the cylindrical member (9). Furthermore, the depth of the step (19) from the top (11) of the tubular member (9) is such that the tip of the inner tube (1) of the ligation kit is moved to ensure that the O-ring (4) is transferred to the ligation kit. It is preferable to set the distance obtained by adding the thickness of the O-ring (4) or half of the thickness to the distance from the tip of the slide cylinder (2) or the outer cylinder (3) to the outer diameter.

  The extension (17) is preferably provided so as to maintain the clearance between the cylindrical member (9) and the hole of the substrate (10), and the extension (17) and the stopper (18) are provided on the substrate (10). It is preferable that it does not protrude from the rib (14). The stopper (18) is preferably provided at a position where the distance from the upper surface (12) of the substrate (10) is equal to or less than the total length of the cylindrical member (9), and more preferably at a position equal to the total length. The extension part (17) and the flange (15) move from the initial position of the cylindrical member (9) until the top part (11) moves to the same height as the upper surface (12) of the substrate (10). The structure should not interfere. It is sufficient that the size of the protrusion (18) on the inner side of the stopper (18) is a portion where the lower end of the tubular member (9) and the stopper (18) are caught, and 0.1 to 1.0 mm is sufficient. When the member (9) is inserted into the hole of the substrate (10), the extension (17) and the stopper (18) are greatly deformed, which makes it difficult to assemble.

  As a material of the substrate (10) and the cylindrical member (9) constituting the O-ring mounting tool (21) of the present invention, a material with good sliding property that allows the cylindrical member (9) and the O-ring (4) to slide smoothly. Is preferred. In addition, since a suitable clearance is required, it is easy to process and dimensional accuracy is good. Further, as a material that is not thermally deformed by heat sterilization or temperature, for example, a metal such as stainless steel or a hard plastic is preferable. . Moreover, since the extension part (17) and the stopper (18) are deformed during assembly as described above, it is preferable to use a material having a certain degree of flexibility.

・
It is sectional drawing which shows an example of the ligation kit for endoscopes which uses the conventional O-ring mounting tool. It is a top view which shows an example of the conventional O-ring mounting tool. It is AA 'sectional drawing of FIG. 2 which shows an example of the conventional O-ring mounting tool. It is sectional drawing which shows an example in use of the conventional O-ring mounting tool and the kit for ligation. It is sectional drawing which shows an example which produced the malfunction in use of the conventional O-ring mounting tool and the kit for ligation. It is a top view which shows one Example of the O-ring mounting tool of this invention. FIG. 7 is a cross-sectional view taken along the line AA ′ of FIG. 6 showing an embodiment of the O-ring mounting tool of the present invention. It is sectional drawing which shows an example in use of the O-ring mounting tool and ligation kit of this invention. It is sectional drawing which shows an example in use of the O-ring mounting tool and ligation kit of this invention. It is sectional drawing which shows an example after using the O-ring mounting tool of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inner cylinder 2 Slide cylinder 3 Outer cylinder 4 O-ring 5 Tube 6 Endoscope 7 Mounting cylinder 8 Seal ring 9 Cylindrical member 10 Board | substrate 11 Top part 12 Upper surface 13 Lower surface 14 Rib 15 Flange 16 Protection rib 17 Extension part 18 Stopper 19 Step 20 Through-hole 21 O-ring mounting tool

Claims (2)

A substrate having at least one through hole;
A cylindrical member slidably accommodated in the through hole;
An O-ring attached to the outer periphery of the upper end portion of the cylindrical member,
To attach the O-ring to the distal end portion of an endoscopic ligation tool used for ligating tissue in a body cavity endoscopically by sliding the cylindrical member from the upper part to the lower part in the through-hole. O-ring wearing tool,
The through hole is formed with substantially the same diameter from the upper part to the lower part, and an extension is provided toward the lower part of the through hole , and when the cylindrical member slides downward, An O-ring mounting tool, wherein a stopper that prevents the cylindrical member from falling off is provided from the lower inner wall surface of the extension portion toward the center of the through hole . The O-ring mounting tool according to claim 1, wherein the stopper is a rib-like protrusion.

Images