Absorbable double-layer ligation clamp capable of preventing clamping interference

Abstract

The utility model discloses an absorbable double-layer ligation clamp capable of preventing clamping interference, and belongs to the field of medical instruments. The absorbable double-layer ligation clamp comprises an outer sleeve piece, an outer-layer clamp and an inner-layer clamp, the outer-layer clamp and the inner-layer clamp are assembled in the outer sleeve piece, two outer sleeve clamping arms used for containing the inner-layer clamp are arranged at the front end of the outer sleeve piece, elastic arms are arranged on the outer sleeve piece and located on the two sides of the outer sleeve clamping arms respectively, and positioning holes are formed in the elastic arms. The inner-layer clamp is provided with a positioning column capable of being contained in the positioning hole in the corresponding side, and when the inner-layer clamp is centered left and right relative to the outer sleeve piece, at least part of the side end face of the positioning column is sunken into the positioning hole in the corresponding side; when the side end faces of the positioning columns sink into the outer front edges of the positioning holes in the corresponding sides, the sinking distance H is smaller than 0.55 mm. According to the double-layer ligature clip, the positioning holes are fully filled with the positioning columns of the inner-layer clip assembled on the outer sleeve piece, grooves formed due to the fact that the outer sides of the positioning holes are not filled are reduced or even eliminated, the situation that when two ligature clips are close, the outer sleeve piece pulls the ligature clips which are subjected to clamping is prevented, the clamping reliability and the operation safety of the double-layer ligature clip are improved, and the double-layer ligature clip is convenient to use. And the closing effect of the ligation clip is ensured.

Description

Technical Field

[0001] The utility model relates to a ligation clip, in particular to an absorbable double-layer ligation clip which can prevent interference in clamping. Background Art

[0002] During surgical procedures, ligation clips are often used to clamp intracavitary tissue or blood vessels, achieving both hemostasis and ligation. Ligation clips can be categorized by material as metal, non-absorbable, and absorbable. Absorbable clips are made of biodegradable materials and are completely degraded and absorbed within the body over time. Therefore, absorbable clips are currently more widely used and more readily accepted by patients.

[0003] Absorbable ligature clamps are structurally divided into V-shaped single clamps and double-layer ligature clamps. Compared to the V-shaped single clamp, the double-layer ligature clamp consists of an inner and outer clamp, which are assembled together within the outer sleeve to form a ligature clamp assembly. Although the double-layer ligature clamp is more complex than the V-shaped single clamp, the combination of the inner and outer clamps provides a better clamping effect and is more convenient and efficient to use.

[0004] like Figure 1 and Figure 2 As shown, the inner clamp 3 of the conventional double-layer ligation clamp is held in an open state on the two outer clamp arms 1-1 at the front end of the outer sleeve 1. The clamp arms of the inner clamp 3 are located in the limiting grooves 1-2 on the inner sides of the outer clamp arms 1-1 on the corresponding sides. Elastic arms 1-3 are provided on both sides of the outer sleeve 1. Positioning holes 1-4 are provided at the front ends of the elastic arms 1-3. Positioning posts 3-1 on both sides of the rear portion of the inner clamp 3 engage with the positioning holes 1-4 on the corresponding sides. The outer clamp 2 is provided inside the outer sleeve 1 and located at the rear side of the inner clamp 3. Generally, a push block is also provided at the rear side of the outer clamp 2 to push the outer clamp 2 forward. When in use, the rear end of the outer sleeve 1 is installed on the clamping device. The firing action of the clamping device pushes the push block forward, and then pushes the outer layer clamp 2 to slide forward. Since the position of the inner layer clamp 3 is fixed by the positioning column 3-1, the inner layer clamp 3 cannot move forward at this time. As the outer layer clamp 2 moves forward, the inner layer clamp 3 enters between the two clamping arms of the outer layer clamp 2, thereby realizing the closure of the clamping arms of the inner layer clamp 3; after the inner layer clamp 3 is completely closed, continue to push the outer layer clamp 2. At this time, the elastic arm 1-3 is deformed outward due to the push of the positioning column 3-1, and then the positioning column 3-1 of the inner layer clamp 3 is disengaged from the corresponding positioning hole 1-4, completing the clamping process.

[0005] In clinical practice, in order to effectively ligate tissues or blood vessels, multiple ligature clips are usually required for use. When the clamping positions of two ligature clips are close, interference may sometimes occur between the ligature clips that have been clamped and the outer sleeve 1. Specifically, refer to Figure 3As shown, clinical practice has found that since the above-mentioned positioning holes 1-4 are through holes and have a certain depth, when the two ligation clips are close to each other, the positioning column 3-1 of the inner layer clip 3 that has been clamped is easy to get stuck in the positioning hole 1-4 of the outer sleeve 1 that is being clamped, especially in the final stage of the clamping process. The deformation of the elastic arm 1-3 to the outside will further aggravate the occurrence of this phenomenon. As the outer sleeve 1 retreats after the clamping is completed, it is very easy to pull the ligation clip that has been clamped, causing the ligation clip that has been clamped to shift. This pulling phenomenon not only easily affects the reliability of the ligation clip's closure on tissues or blood vessels, but also easily causes damage to the patient, increasing safety hazards. Summary of the Invention

[0006] 1. Technical problems to be solved by the utility model

[0007] The purpose of the present invention is to overcome the above-mentioned shortcomings of existing double-layer ligation clips and provide an absorbable double-layer ligation clip that can prevent interference in clip application. The present invention utilizes the technical solution of optimizing the matching dimensions of the positioning holes of the outer sleeve and the positioning posts of the inner clamp, utilizing the positioning posts of the inner clamp assembled on the outer sleeve to fully fill the positioning holes, reducing or even eliminating the grooves formed by the unfilled outer sides of the positioning holes. This prevents the positioning posts of adjacent inner clamps that have already been clamped from being caught in the positioning holes of the outer sleeve from the outside, and prevents the outer sleeve from pulling on the already clamped ligation clip when the two ligation clips are close together. This improves the clamping reliability and operational safety of the double-layer ligation clip and ensures the closure effect of the ligation clip. Furthermore, the above-mentioned problems can be solved simply by adjusting the local dimensions of the ligation clip outer sleeve, making it simple and convenient to implement and having wide application value.

[0008] 2. Technical solution

[0009] In order to achieve the above-mentioned purpose, the technical solution provided by the present utility model is:

[0010] The utility model discloses an absorbable double-layer ligation clip which can prevent interference of clamping, comprising an outer sleeve, and an outer layer clip and an inner layer clip assembled in the outer sleeve, the front end of the outer sleeve having two outer clip arms for accommodating the inner layer clip, the outer sleeve being provided with elastic arms on both sides of the outer clip arms, the elastic arms being provided with positioning holes, the inner layer clip being provided with positioning posts which can be accommodated in the positioning holes on the corresponding sides, when the inner layer clip is centered left and right relative to the outer sleeve, the side end faces of the positioning posts are at least partially recessed in the positioning holes on the corresponding sides; when the side end faces of the positioning posts are recessed in the outer front edge of the positioning holes on the corresponding sides, the recessed distance H is less than 0.55 mm.

[0011] Furthermore, the indentation distance H is less than 0.1 mm.

[0012] Furthermore, the outer side surface of the elastic arm is an inclined surface inclined toward the front end of the outer sleeve, so that the rear side hole depth of the positioning hole is greater than the front side hole depth of the positioning hole, and the side end surface of the positioning column does not protrude from the outer rear edge of the positioning hole on the corresponding side, and the side end surface of the positioning column is sunken or flush or protrudes from the outer front edge of the positioning hole on the corresponding side.

[0013] Furthermore, the front side hole depth D of the positioning hole is not greater than 1.2 mm.

[0014] Furthermore, the front side hole depth D of the positioning hole is 0.5 mm to 1.1 mm.

[0015] Furthermore, the outer front edge of the positioning hole is chamfered.

[0016] Furthermore, a limiting groove is provided on the inner side of the outer jacket clamp arm, and the outer layer clamp is arranged in the slideway of the outer sleeve and is located behind the inner layer clamp.

[0017] Furthermore, the outer sleeve is an integral injection molded part, and the outer layer clip and the inner layer clip are both made of absorbable material.

[0018] 3. Beneficial effects

[0019] Compared with the existing known technologies, the technical solution provided by the present invention has the following beneficial effects:

[0020] (1) The utility model is an absorbable double-layer ligation clip that can prevent interference with clamping. It includes an outer sleeve, and an outer layer clip and an inner layer clip assembled in the outer sleeve. The front end of the outer sleeve has two outer clip arms for accommodating the inner layer clip. The outer sleeve is provided with elastic arms on both sides of the outer clip arms, and the elastic arms are provided with positioning holes. The inner layer clip is provided with a positioning column that can be accommodated in the positioning hole on the corresponding side. When the inner layer clip is centered on the left and right sides of the outer sleeve, the side end surface of the positioning column is at least partially sunken into the positioning hole on the corresponding side; when the side end surface of the positioning column is sunken into the outer end surface of the positioning hole on the corresponding side, the side end surface of the positioning column is sunken into the outer end surface of the positioning hole on the corresponding side. When the front edge is at the front, the indentation distance H is less than 0.55mm; through the optimized design of the matching size of the positioning hole of the outer sleeve and the positioning column of the inner clamp, the positioning hole is fully filled with the positioning column of the inner clamp assembled on the outer sleeve, and the groove formed by the unfilled outside of the positioning hole is reduced or even eliminated, thereby preventing the positioning column of the adjacent inner clamp that has been clamped from being stuck into the positioning hole of the outer sleeve from the outside, preventing the outer sleeve from pulling the ligature clip that has been clamped when the two ligature clips are close, thereby improving the clamping reliability and operational safety of the double-layer ligature clip and ensuring the closing effect of the ligature clip.

[0021] (2) The utility model provides an absorbable double-layer ligation clip that can prevent interference in clip application. The above-mentioned problem can be solved by simply adjusting the local size of the ligation clip outer sleeve. It is simple and convenient to implement and has wide promotion and application value.

[0022] (3) The utility model provides an absorbable double-layer ligation clamp that can prevent interference in clamping. The outer side surface of its elastic arm is an inclined surface inclined toward the front end of the outer sleeve, so that the rear side hole depth of the positioning hole is greater than the front side hole depth of the positioning hole, the side end surface of the positioning column does not protrude from the outer rear edge of the positioning hole on the corresponding side, and the side end surface of the positioning column is sunken or flush or protrudes from the outer front edge of the positioning hole on the corresponding side; and the front side hole depth D of the positioning hole is not greater than 1.2 mm. By reducing the front side hole depth of the positioning hole, the outer sleeve will not get stuck in the adjacent ligation clamp that has been clamped when it is retracted after clamping, so that the outer sleeve can be smoothly withdrawn after clamping, further avoiding the pulling interference phenomenon when the two ligation clamps are close.

[0023] (4) The utility model provides an absorbable double-layer ligation clamp that can prevent clamping interference. The outer front edge of the positioning hole is also provided with a chamfer. The chamfer can further prevent the positioning hole from getting stuck on the positioning column of the adjacent inner layer clamp that has been clamped, further preventing the above-mentioned pulling interference. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the three-dimensional structure of an existing double-layer ligation clip;

[0025] Figure 2 It is a schematic diagram of the cross-sectional structure of an existing double-layer ligation clip;

[0026] Figure 3 A schematic diagram of the interference between the existing double-layer ligation clip and the already applied ligation clip during the clamping process;

[0027] Figure 4 This is a schematic diagram of the three-dimensional structure of the absorbable double-layer ligation clip of the present invention that can prevent clip interference;

[0028] Figure 5 This is a schematic diagram of a three-dimensional cross-sectional structure of the absorbable double-layer ligation clip of the present invention that can prevent clip interference;

[0029] Figure 6 This is a schematic diagram of a planar cross-sectional structure of the absorbable double-layer ligation clip of the present invention that can prevent clip interference;

[0030] Figure 7 This is a schematic cross-sectional view of the inner and outer components of the absorbable double-layer ligation clip of the present invention that can prevent clip interference;

[0031] Figure 8 This is a schematic diagram of the absorbable double-layer ligation clip of the present invention that can prevent interference with the adjacent ligation clip that has been clipped during the clipping process;

[0032] Figure 9 for Figure 8Schematic diagram of the locally enlarged structure at K in the middle.

[0033] Explanation of the numbers in the schematic diagram:

[0034] 1. Outer set; 1-1. Outer jacket clamp arm; 1-2. Limiting groove; 1-3. Elastic arm; 1-3a. Inclined surface; 1-4. Positioning hole; 1-4a. Outer rear edge; 1-4b. Outer front edge; 1-5. Chamfer; 1-6. Slide; 2. Outer clamp; 3. Inner clamp; 3-1. Positioning column. DETAILED DESCRIPTION

[0035] In order to further understand the content of the present invention, the present invention is described in detail with reference to the accompanying drawings.

[0036] Figures 1 to 3 The structure of an existing double-layer ligation clamp is shown, as well as the reasons for interference with the already applied ligation clamp during the application process. Clinical practice has found that when multiple ligation clamps are applied to close a ligation, the positioning post 3-1 of the inner layer 3 of the already applied ligation clamp can easily get stuck in the positioning hole 1-4 of the outer sleeve 1 being applied. This can cause the ligation clamp to shift when the outer sleeve 1 is withdrawn, affecting the closure effect. To solve this problem, the utility model adjusts the matching size of the positioning holes 1-4 of the outer sleeve 1 and the positioning posts 3-1 of the inner layer clip 3, and uses the positioning posts 3-1 of the inner layer clip 3 assembled on the outer sleeve 1 to fully fill the positioning holes 1-4, thereby reducing or even eliminating the grooves formed by the unfilled outsides of the positioning holes 1-4, thereby preventing the positioning posts 3-1 of the adjacent inner layer clips that have been clamped from being stuck into the positioning holes 1-4 of the outer sleeve 1 from the outside, preventing the outer sleeve from pulling the ligation clip that has been clamped when the two ligation clips are close, and improving the clamping reliability and operational safety of the double-layer ligation clip.

[0037] The present invention will be further described below with reference to the embodiments.

[0038] [Example]

[0039] Combine Figures 4 to 7As shown, an absorbable double-layer ligation clip capable of preventing clip interference in this embodiment includes an outer sleeve 1, an outer clip 2, and an inner clip 3 assembled within the outer sleeve 1. The outer sleeve 1 has two outer clip arms 1-1 at the front end for accommodating the inner clip 3. The inner clip 3 is positioned between the two outer clip arms 1-1 in an open state. The outer sleeve 1 is provided with elastic arms 1-3 on either side of the outer clip arms 1-1. The elastic arms 1-3 can be integrally formed with the outer sleeve 1, forming a cantilevered shape and having a certain elasticity to deform outward. The elastic arms 1-3 are provided with positioning holes 1-4. The inner clip 3 is provided with positioning posts 3-1 that can be received in the corresponding positioning holes 1-4. After the inner clip 3 is closed by the outer clip 2 and continues to be pushed, the elastic arms 1-3 are squeezed outward by the positioning posts 3-1, thereby separating the closed inner and outer clips from the outer sleeve 1. The inner clip 3 generally has a certain gap within the outer sleeve 1 to ensure that the inner clip 3 can move within the outer sleeve 1. When the inner clip 3 is centered relative to the outer sleeve 1, the side end surface 3-1a of the positioning post 3-1 is at least partially recessed into the corresponding positioning hole 1-4. This prevents the positioning post 3-1 from excessively protruding from the positioning hole 1-4, which could hinder operation, such as snagging tissue. The positioning hole 1-4 has an outer rear edge 1-4a and an outer front edge 1-4b. The outer rear edge 1-4a refers to the edge of the positioning hole 1-4 on the side away from the outer sleeve arm 1-1. Correspondingly, the outer front edge 1-4b refers to the edge of the positioning hole 1-4 on the side closer to the outer sleeve arm 1-1. The pulling effect of the existing double-layer ligation clamp is mainly generated by the outer front edge 1-4b and the positioning column 3-1 of the adjacent inner layer clamp. In order to prevent this pulling interference problem, in this embodiment, when the inner layer clamp 3 is centered left and right relative to the outer sleeve 1, and when the side end surface 3-1a of the positioning column 3-1 is sunken into the outer front edge 1-4b of the positioning hole 1-4 on the corresponding side, the sunken distance H is less than 0.55mm, that is, the sunken depth of the front side of the positioning hole 1-4 formed by the positioning column 3-1 in the positioning hole 1-4 is controlled within 0.55mm. Compared with the existing absorbable double-layer ligation clamp, the positioning holes 1-4 of the outer sleeve 1 and the positioning posts 3-1 of the inner layer clamp 3 are optimized in size, and the positioning posts 3-1 of the inner layer clamp 3 assembled on the outer sleeve 1 are fully filled with the positioning holes 1-4, reducing or even eliminating the grooves formed by the unfilled outsides of the positioning holes 1-4, thereby preventing the positioning posts 3-1 of the adjacent inner layer clamps 3 that have been clamped from being stuck into the positioning holes 1-4 of the outer sleeve 1 from the outside, preventing the outer sleeve 1 from pulling the ligation clamp that has been clamped when the two ligation clamps are close, thereby improving the clamping reliability and operational safety of the double-layer ligation clamp and ensuring the closing effect of the ligation clamp.

[0040] Preferably, the above-mentioned indentation distance H is less than 0.1 mm, which can further reduce the groove formed by the unfilled outer side of the positioning hole 1-4. In other embodiments, the side end surface 3-1a of the positioning post 3-1 can also be flush with the outer front edge 1-4b of the positioning hole 1-4 on the corresponding side or slightly protrude from the outer front edge 1-4b of the positioning hole 1-4, which can eliminate the groove formed by the unfilled outer side of the positioning hole 1-4. Specifically in this embodiment, the outer side surface of the elastic arm 1-3 is an inclined surface 1-3a inclined toward the front end of the outer sleeve 1, so that the rear side hole depth of the positioning hole 1-4 is greater than the front side hole depth of the positioning hole 1-4, and the side end surface 3-1a of the positioning post 3-1 does not protrude from the outer rear edge 1-4a of the positioning hole 1-4 on the corresponding side. The side end surface 3-1a of the positioning post 3-1 is recessed or flush or protrudes from the outer front edge 1-4b of the positioning hole 1-4 on the corresponding side.

[0041] The size matching relationship between the positioning holes 1-4 of the outer sleeve 1 and the positioning posts 3-1 of the inner layer clip 3 can be achieved by reducing the depth of the positioning holes 1-4 or increasing the length of the positioning posts 3-1, or by simultaneously reducing the depth of the positioning holes 1-4 and increasing the length of the positioning posts 3-1. It should be noted that increasing the length of the positioning posts 3-1 will easily make it difficult for the positioning posts 3-1 to detach from the positioning holes 1-4, and will also increase the material of the inner layer clip 3, increasing the production cost. The longer positioning posts 3-1 will also easily increase the foreign body sensation of the ligation clip in the body. Therefore, this embodiment preferably solves the above problem by reducing the depth of the positioning holes 1-4. In this way, the above problem can be solved by simply adjusting the local dimensions of the ligation clip outer sleeve 1. It is simple and convenient to implement and has wide promotion and application value.

[0042] Reference Figure 6 and Figure 7 As shown, specifically in this embodiment, the front side hole depth D of the positioning hole 1-4 is not greater than 1.2 mm. Further preferably, the front side hole depth D of the positioning hole 1-4 is 0.5 mm to 1.1 mm. By reducing the front side hole depth of the positioning hole 1-4, the outer sleeve 1 will not get stuck with the adjacent ligation clip that has been clamped when it retracts after clamping, so that the outer sleeve 1 can be smoothly withdrawn after clamping, further avoiding the pulling interference phenomenon when the two ligation clips are close. The above-mentioned "front side hole depth D" refers to the projected distance from the bottom of the hole of the positioning hole 1-4 to the outer front edge 1-4b, that is, the maximum size of the front side of the positioning hole 1-4. In addition, a chamfer 1-5 is provided at the outer front edge 1-4b of the positioning hole 1-4. The chamfer 1-5 can be a rounded corner or an oblique chamfer, etc. The chamfer 1-5 can further prevent the positioning hole 1-4 from getting stuck with the positioning column 3-1 of the adjacent inner layer clip 3 that has been clamped, further preventing the above-mentioned pulling interference. For details, refer to Figure 8 and Figure 9As shown, on the one hand, through the matching size design of the positioning holes 1-4 and the positioning posts 3-1, the positioning holes 1-4 have been basically filled by the positioning posts 3-1, so that the positioning posts 3-1 of the adjacent inner layer clips 3 that have been clamped cannot be stuck in the positioning holes 1-4; on the other hand, even the positioning posts 3-1 of the adjacent inner layer clips 3 that have been clamped can still be stuck in the positioning holes 1-4 in a small size, especially when the clamping operation is nearing the end, the elastic arm 1-3 deforms outward to make the adjacent positioning posts 3-1 enter the positioning holes 1-4, and when the outer sleeve 1 is withdrawn outward, the chamfer 1-5 can play a transition role, reducing the possibility of the positioning holes 1-4 hooking the adjacent positioning posts 3-1, thereby preventing the outer sleeve from pulling the ligation clip that has been clamped when the two ligation clips are close.

[0043] Similar to the structure of existing double-layer ligature clamps, the outer clamp arm 1-1 is provided with a retaining groove 1-2 on its inner side, and the two clamping arms of the inner clamp 3 are positioned within the corresponding retaining grooves 1-2. The outer clamp 2 is positioned within the slideway 1-6 of the outer sleeve 1 and behind the inner clamp 3. The front end of the outer clamp 2 has a roughly V-shaped guide notch, allowing the inner clamp 3 to follow the guide notch and enter the clamping groove of the outer clamp 2. The clamping groove of the outer clamp 2 is also provided with a guide track, and the outer sides of the two clamping arms of the inner clamp 3 are provided with a track groove. During the process of the outer clamp 2 being pushed forward, the inner clamp 3 does not move relative to the outer sleeve 1 due to the restriction of the positioning column 3-1 and the positioning hole 1-4. At this time, as the outer clamp 2 is pushed forward, the inner clamp 3 gradually enters the clamping groove of the outer clamp 2, so that the clamping arm of the inner clamp 3 is closed; when the inner clamp 3 is completely closed, the outer clamp 2 and the inner clamp 3 are attached together, and the outer clamp 2 continues to be pushed forward, forcing the inner clamp 3 to move forward together. At this time, the elastic arm 1-3 is elastically deformed outward under the action of the positioning column 3-1, and finally the positioning column 3-1 is disengaged from the positioning hole 1-4, completing the entire clamping process. The outer sleeve 1 is preferably an integral injection molded part, and the outer clamp 2 and the inner clamp 3 are both made of absorbable material.

[0044] The present invention provides an absorbable double-layer ligation clamp that can prevent interference in clamping. By optimizing the dimensions of the positioning holes of the outer sleeve and the positioning posts of the inner sleeve, the positioning holes are fully filled with the positioning posts of the inner sleeve assembled on the outer sleeve, reducing or even eliminating the grooves formed by the unfilled outer sides of the positioning holes. This prevents the positioning posts of adjacent inner sleeves that have already been clamped from being stuck into the positioning holes of the outer sleeve, and prevents the outer sleeve from pulling on the already clamped ligation clamp when the two ligation clamps are close together. This improves the clamping reliability and operational safety of the double-layer ligation clamp and ensures the closure effect of the ligation clamp. Furthermore, the above-mentioned problem can be solved simply by adjusting the local dimensions of the ligation clamp outer sleeve, making it simple and convenient to implement and having wide application value.

[0045] The above schematically describes the present invention and its embodiments, which is not intended to be limiting. The accompanying drawings illustrate only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by this and, without departing from the spirit of the present invention, uninventively designs structures and embodiments similar to this technical solution, they shall fall within the scope of protection of the present invention.

Claims

1. An absorbable double-layer ligation clip capable of preventing clipping interference, comprising an outer sleeve (1), and an outer layer clip (2) and an inner layer clip (3) assembled in the outer sleeve (1), wherein the front end of the outer sleeve (1) has two outer sleeve clip arms (1-1) for accommodating the inner layer clip (3), the outer sleeve (1) is provided with elastic arms (1-3) on both sides of the outer sleeve clip arms (1-1), the elastic arms (1-3) are provided with positioning holes (1-4), and the inner layer clip (3) is provided with positioning posts (3-1) capable of being accommodated in the positioning holes (1-4) on the corresponding sides, characterized in that: When the inner layer clip (3) is centered left and right relative to the outer sleeve (1), the side end surface (3-1a) of the positioning column (3-1) is at least partially sunken into the positioning hole (1-4) on the corresponding side; when the side end surface (3-1a) of the positioning column (3-1) is sunken into the outer front edge (1-4b) of the positioning hole (1-4) on the corresponding side, the sunken distance H is less than 0.55 mm.

2. The absorbable double-layer ligation clip capable of preventing clip interference according to claim 1, characterized in that: The indentation distance H is less than 0.1 mm.

3. The absorbable double-layer ligation clip capable of preventing clip interference according to claim 1 or 2, characterized in that: The outer side surface of the elastic arm (1-3) is an inclined surface (1-3a) inclined toward the front end of the outer sleeve (1), so that the rear hole depth of the positioning hole (1-4) is greater than the front hole depth of the positioning hole (1-4); the side end surface (3-1a) of the positioning column (3-1) does not protrude from the outer rear edge (1-4a) of the positioning hole (1-4) on the corresponding side; and the side end surface (3-1a) of the positioning column (3-1) is sunken inward, flush with, or protrudes from the outer front edge (1-4b) of the positioning hole (1-4) on the corresponding side.

4. The absorbable double-layer ligation clip capable of preventing clip interference according to claim 3, characterized in that: The front side hole depth D of the positioning hole (1-4) is not greater than 1.2 mm.

5. The absorbable double-layer ligation clip capable of preventing clip interference according to claim 4, characterized in that: The front side hole depth D of the positioning hole (1-4) is 0.5mm-1.1mm.

6. The absorbable double-layer ligation clip capable of preventing clip interference according to claim 3, characterized in that: A chamfer (1-5) is further provided at the outer front edge (1-4b) of the positioning hole (1-4).

7. The absorbable double-layer ligation clip capable of preventing clip interference according to claim 6, characterized in that: A limiting groove (1-2) is provided on the inner side of the outer jacket clamp arm (1-1); the outer layer clamp (2) is arranged in the slideway (1-6) of the outer sleeve (1) and is located behind the inner layer clamp (3).

8. The absorbable double-layer ligation clip capable of preventing clip interference according to claim 7, characterized in that: The outer sleeve (1) is an integral injection-molded part, and the outer layer clip (2) and the inner layer clip (3) are both made of absorbable material.

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