Snare for lumen tissue ligation

Abstract

The snare comprises an outer sleeve and a ligature, an inner sleeve with the length larger than that of the outer sleeve is arranged in the outer sleeve in a penetrating mode, a contraction pulling plate is arranged at one end of the inner sleeve, a deformation supporting ring is arranged at the other end of the inner sleeve, an embedded arc groove is formed in the inner wall of the deformation supporting ring, and the inner wall of the deformation supporting ring is connected with the ligature. The ligature is arranged in the inner sleeve in a penetrating mode, one end of the ligature is embedded in the embedded arc groove, and the other end of the ligature penetrates through the contraction pulling plate. When the outer sleeve extends into a cavity of a patient, the deformation supporting ring is pushed out of the outer sleeve, and the ligature embedded in the embedded arc groove can be expanded along with expansion of the deformation supporting ring, so that a doctor can sleeve the ligature on a part needing to be ligated more conveniently; and the coil part is limited by the silica gel petals, so that the coil part is prevented from automatically falling off from the embedded arc groove under the condition that the traction part is not manually pulled.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical devices, and particularly relates to a snare for ligating luminal tissue. Background Art

[0002] During an endoscopic surgery, when a doctor removes a lesion, it is necessary to ligate the position near the base of the lesion, and then remove the lesion tissue to effectively avoid the bleeding risk during the surgery.

[0003] The existing ligation tools usually adopt a disposable ligation snare, which generally consists of a pull wire loop, a circular tip, a carrier rod and a suture coil.

[0004] Since there is a lot of body fluid or mucosa in the patient's cavity, after the suture coil extends out of the carrier rod, the suture coils are easily stuck together, making it inconvenient for the doctor to put the suture coil around the base of the lesion tissue. Summary of the Invention

[0005] The purpose of the utility model is to solve the problems existing in the prior art, and provides a snare for ligating luminal tissue, which can naturally expand the suture coil, facilitating the doctor to put the suture coil around the base of the lesion tissue.

[0006] To achieve the above purpose, the utility model is realized by the following technical solutions: a snare for ligating luminal tissue, including an outer sleeve and a ligation thread. An inner sleeve with a length greater than that of the outer sleeve is arranged inside the outer sleeve. One end of the inner sleeve is provided with a contraction pull plate, and the other end of the inner sleeve is provided with a deformation support ring. An embedded arc groove is opened on the inner wall of the deformation support ring. The ligation thread is arranged inside the inner sleeve. One end of the ligation thread is embedded inside the embedded arc groove, and the other end of the ligation thread passes through the contraction pull plate.

[0007] After the outer sleeve is inserted into the patient's cavity, the deformation support ring is pushed out of the outer sleeve. As the deformation support ring unfolds, the ligation thread embedded in the embedded arc groove can be expanded, making it more convenient for the doctor to put the ligation thread around the part to be ligated.

[0008] Optionally, the ligation thread includes a traction part passing through the inner sleeve, a coil part embedded inside the embedded arc groove and connected to the traction part. A contraction knot is arranged on the side of the traction part close to the coil part. The traction part, the coil part and the contraction knot are an integral whole.

[0009] The coil part is embedded inside the embedded arc groove. As the deformation support ring unfolds, the coil part can be expanded synchronously, thus facilitating the coil part to be put around the part to be ligated.

[0010] Optionally, the ligature further comprises a pull ring arranged at the other end of the traction portion, the pull ring is a plastic ring, and the pull ring is located outside the inner sleeve.

[0011] The traction part is pulled by the pull ring to shrink the coil part and then locked by the shrinkage knot. After the shrinkage knot is locked, the traction part is cut off by pliers.

[0012] Optionally, inner walls on both sides of the embedded arc groove and the surface of the coil part are provided with silicone petals, and a gap is left between the silicone petals on one side and the silicone petals on the other side.

[0013] The coil part is limited by the silicone petal to prevent the coil part from automatically falling out of the embedded arc groove without manual pulling of the traction part.

[0014] Optionally, a reducing ring groove is provided on a surface of one end of the outer sleeve close to the deformation support ring.

[0015] It is convenient to insert the outer sleeve into the patient's cavity.

[0016] Optionally, an inner angle of an end of the deformation support ring close to the inner sleeve is between 45° and 60°.

[0017] Through the above design, the doctor can easily drag the deformable support ring back into the outer sleeve after completing ligation.

[0018] Optionally, the traction part and the coil part are both polypropylene wires with a diameter between 0.1 and 0.2 mm.

[0019] Optionally, the length of the shrinkage pull plate is greater than the diameter of the outer sleeve, and bending portions are provided at both ends of the shrinkage pull plate.

[0020] The above technical solution makes it convenient for doctors to push and pull the retracting pull plate.

[0021] Compared with the prior art, the beneficial effects of the utility model are: 1. When the outer sleeve is extended into the patient's cavity, the deformable support ring is pushed out of the outer sleeve. As the deformable support ring is expanded, the ligature embedded in the embedded arc groove can be stretched out, so that the doctor can more conveniently put the ligature on the part that needs ligation; 2. The silicone petal is used to limit the coil part to prevent the coil part from automatically falling out of the embedded arc groove without manual pulling of the traction part; 3. The inner angle of the end of the deformable support ring close to the inner sleeve is designed to be 45-60°, so that the doctor can easily drag the deformable support ring back into the outer sleeve after completing the ligation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the three-dimensional structure of a snare for ligating lumen tissue according to the utility model;

[0023] Figure 2 This is a front view schematic diagram of a snare for ligating lumen tissue according to the utility model;

[0024] Figure 3 This is a schematic diagram of the enlarged structure of the operating end of a snare for ligating lumen tissue of the utility model;

[0025] Figure 4 This is a schematic diagram of the enlarged structure of the snare end of a snare for ligating lumen tissue of the utility model;

[0026] Figure 5 It is a cross-sectional enlarged structural schematic diagram of the connection relationship between the deformable support ring, the embedded arc groove, the silicone petal, and the coil part of the utility model.

[0027] In the figure: 1. outer sleeve; 2. inner sleeve; 3. contraction pull plate; 31. perforation; 4. deformation support ring; 41. embedded arc groove; 42. silicone petal; 5. ligature; 51. traction part; 52. contraction knot; 53. coil part; 54. pull ring. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the utility model to clearly and completely describe the technical solution of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as "middle", "upper", "lower", "left", "right", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0030] like Figure 1 —2, the specific scheme of the embodiment is as follows: a snare for ligating luminal tissue, comprising an outer sleeve 1 and a ligature 5, an inner sleeve 2 whose length is greater than that of the outer sleeve 1 is passed through the interior of the outer sleeve 1, a shrinkage pull plate 3 is provided at one end of the inner sleeve 2, a deformation support ring 4 is provided at the other end of the inner sleeve 2, an inner wall of the deformation support ring 4 is provided with an embedded arc groove 41, the ligature 5 is passed through the interior of the inner sleeve 2, and one end of the ligature 5 is embedded in the embedded arc groove 41.

[0031] In this embodiment, the portion close to the deformation support ring 4 is the collar end of the device, and the portion close to the shrink pull plate 3 is the operating end of the device.

[0032] The other end of the ligature 5 passes through the retractable pull plate 3 , the length of the retractable pull plate 3 is greater than the diameter of the outer sleeve 1 , and both ends of the retractable pull plate 3 are provided with bending parts to facilitate the doctor to push and pull the retractable pull plate 3 .

[0033] like Figure 3 As shown, it should be mentioned here that a through hole 31 with the same inner diameter as the inner diameter of the inner sleeve 2 is provided in the shrink pull plate 3 to facilitate the passing of the ligature line 5.

[0034] In this embodiment, the deformable support ring 4 is made of medical grade stainless steel. The memory metal allows the deformable support ring 4 to have good elasticity, and can be deformed under external force, and then automatically return to its original shape when there is no external force. When the outer sleeve 1 is extended into the patient's cavity, the deformable support ring 4 is pushed out of the outer sleeve 1, and the deformable support ring 4 is also automatically expanded synchronously. As the deformable support ring 4 is expanded, the ligature 5 embedded in the embedded arc groove 41 can be stretched, so that the doctor can more conveniently put the ligature 5 on the part that needs ligation.

[0035] like Figure 2 As shown, the ligature 5 includes a traction portion 51 passing through the inner sleeve 2, a coil portion 53 embedded in the embedded arc groove 41 and connected to the traction portion 51, and a contraction knot 52 is provided on one side of the traction portion 51 close to the coil portion 53. The traction portion 51, the coil portion 53 and the contraction knot 52 are a whole.

[0036] like Figures 4 - 5 As shown, the coil portion 53 is embedded in the embedded arc groove 41. As the deformation support ring 4 is expanded, the coil portion 53 can be expanded synchronously, so that the coil portion 53 can be easily inserted into the part that needs to be ligated.

[0037] In this embodiment, the pulling portion 51 and the coil portion 53 are both made of polypropylene wire, and the diameter thereof is between 0.1 mm and 0.2 mm.

[0038] like Figure 3 As shown, the ligature 5 further includes a pull ring 54 disposed at the other end of the traction portion 51 . The pull ring 54 is a plastic ring and is located outside the inner sleeve 2 .

[0039] The traction part 51 is pulled by the pull ring 54, thereby shrinking the coil part 53 and locking it with the shrinking knot 52. After the shrinking knot 52 is locked, the traction part 51 is cut off with pliers.

[0040] like Figures 4 - 5 As shown, the inner walls of both sides of the embedded arc groove 41 and the surface of the coil part 53 are provided with silicone petals 42 , and a gap is left between the silicone petals 42 on one side and the silicone petals 42 on the other side.

[0041] like Figure 5As shown, the cross-section of the silicone flap 42 is approximately triangular. The gap between the tips of the two silicone flaps 42 is 1 / 4 of the cross-sectional diameter of the embedded arc groove 41, which can limit the position of the coil part 53. At the same time, under the action of human pulling force, the coil part 53 can be pulled out from the embedded arc groove 41 blocked by the two silicone flaps 42. The inclined surface of the silicone flap 42 is an arc surface, and the arc surface contacts the coil part 53.

[0042] The silicone flap 42 is used to limit the position of the coil part 53 and enclose the coil part 53 in the embedded arc groove 41 to prevent the coil part 53 from automatically falling out of the embedded arc groove 41 without manually pulling the traction part 51. When the doctor pulls the pull ring 54 at the other end of the outer sleeve 1, the coil part 53 can be pulled out of the embedded arc groove 41 and tightened.

[0043] It should be noted that the inner diameter of the inner sleeve 2 should be greater than the diameter of the ligature 5, so that the ligature 5 can slide easily inside the inner sleeve 2. In this way, when the deformation support ring 4 automatically expands, it can drag the ligature 5 to automatically retract towards the deformation support ring 4 without pulling the coil part 53 out of the embedded arc groove 41.

[0044] As Figure 1 、 Figure 4 shown, a reduced-diameter ring groove is provided on the surface of the outer sleeve 1 near one end of the deformation support ring 4 to facilitate the insertion of the outer sleeve 1 into the patient's cavity.

[0045] It should be noted that in this embodiment, the inner angle of one end of the deformation support ring 4 close to the inner sleeve 2 is between 45-60°. With such a design, the deformation support ring 4 can be deformed more easily. After the doctor completes the ligation, it is convenient to drag the deformation support ring 4 back into the outer sleeve 1.

[0046] The working principle of the above embodiment is as follows: In the initial state, the deformation support ring 4 is located inside the outer sleeve 1. The doctor inserts the outer sleeve 1 into the patient's cavity and, with the help of an endoscope, reaches the predetermined position. Then, the contraction pull plate 3 is pushed to make the inner sleeve 2 slide inside the outer sleeve 1 until the deformation support ring 4 gradually extends out of the outer sleeve 1. During the extension of the deformation support ring 4, the deformation support ring 4 automatically expands. Driven by the deformation support ring 4, the coil part 53 embedded in the embedded arc groove 41 is synchronously expanded. Then, the outer sleeve 1 is operated to let the coil part 53 cover the base of the diseased tissue. Subsequently, the pull ring 54 is pulled outwards. Driven by the pull ring 54, the traction part 51 pulls the coil part 53, and then the coil part 53 starts to contract until the coil part 53 breaks free from the silicone flap 42 in the embedded arc groove 41 and is locked. Then, it is cut with scissors between the shrinkage knot 52 and the traction part 51. Then, the contraction pull plate 3 is pulled to make the deformation support ring 4 retract back into the outer sleeve 1 again. Finally, the outer sleeve 1 is taken out of the patient's cavity.

[0047] Although embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A snare for ligating luminal tissue, characterized in that: It includes an outer sleeve and a ligature. An inner sleeve with a length greater than that of the outer sleeve is passed through the interior of the outer sleeve. A shrinkage pull plate is provided at one end of the inner sleeve, and a deformation support ring is provided at the other end of the inner sleeve. An embedded arc groove is opened on the inner wall of the deformation support ring. The ligature is passed through the interior of the inner sleeve, and one end of the ligature is embedded in the embedded arc groove, and the other end of the ligature passes through the shrinkage pull plate.

2. The snare for ligating luminal tissue according to claim 1, characterized in that: The ligature comprises a traction portion passing through the inner sleeve, a coil portion embedded in the embedded arc groove and connected to the traction portion, a contraction knot is provided on one side of the traction portion close to the coil portion, and the traction portion, the coil portion and the contraction knot are a whole.

3. The snare for ligating luminal tissue according to claim 2, characterized in that: The ligature also includes a pull ring arranged at the other end of the traction portion, the pull ring is a plastic ring, and the pull ring is located outside the inner sleeve.

4. The snare for ligating luminal tissue according to claim 2, characterized in that: The inner walls on both sides of the embedded arc groove and the surface of the coil part are provided with silicone petals, and a gap is left between the silicone petals on one side and the silicone petals on the other side.

5. The snare for ligating lumen tissue according to claim 1, characterized in that: A diameter-reducing annular groove is provided on the surface of one end of the outer sleeve close to the deformation support ring.

6. The snare for ligating luminal tissue according to claim 1, characterized in that: The inner angle of the end of the deformation support ring close to the inner sleeve is between 45° and 60°.

7. The snare for ligating luminal tissue according to claim 2, characterized in that: The traction part and the coil part are both polypropylene wires with a diameter between 0.1 and 0.2 mm.

8. The snare for ligating lumen tissue according to claim 1, characterized in that: The length of the shrinkage pull plate is greater than the diameter of the outer sleeve, and bending parts are provided at both ends of the shrinkage pull plate.

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