Adjustable dense net support

Abstract

The invention relates to an adjustable dense net stent which comprises a far-end stent body, the far-end stent body is of a net tubular structure formed by weaving weaving wires, and the ends of two adjacent weaving wires at the end, close to the near end, of the far-end stent body are connected to form a first sealing end; the near-end stent is of a net-tube-shaped structure formed by weaving weaving wires, and the end portions of the two adjacent weaving wires at the end, close to the far end, of the near-end stent are connected to form a second sealing end; wherein the first sealing end and the second sealing end are connected in an interwoven mode to form a sliding section, and the near-end support can slide in the sliding section when being released. The first sealing end and the second sealing end are interwoven to form the sliding section, so that the near-end stent can slide by a set distance relative to the far-end stent when being released, full coverage of the aneurysm neck can be guaranteed through the arrangement of the length-adjustable structural form, and then the stability of the stent is improved; and the risk caused by over-length or over-short is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of aneurysm stent devices, and in particular to an adjustable dense mesh stent. Background Art

[0002] In the interventional treatment of intracranial aneurysms, dense mesh stents promote thrombosis within the aneurysm by changing hemodynamics.

[0003] In the prior art, a Chinese utility model patent with publication number CN217488977U disclosed a dense mesh stent on September 27, 2022. The dense mesh stent has an overall tubular structure, and is divided into a coated area and a non-coated area. The non-coated area corresponds to the neck of the aneurysm to ensure that endothelialization is preferentially formed at the neck of the aneurysm; the coated area corresponds to other locations in the blood vessel, which can effectively avoid endothelialization of blood vessels at other locations, thereby preventing the formation of thrombus and avoiding occlusion of blood vessels.

[0004] However, the length of existing dense mesh stents is mostly fixed, and the length cannot be effectively adjusted during implantation. When the length of the dense mesh stent is too long, on the one hand, it increases the difficulty of release, and on the other hand, it also increases the risk of thrombosis; when the length of the dense mesh stent is too short, shortening is prone to occur, causing the dense mesh stent to fall into the aneurysm, thereby making the stability of the dense mesh stent poor. Summary of the invention

[0005] The invention provides an adjustable dense mesh bracket to solve the technical problem that the existing dense mesh bracket has poor length fixing stability.

[0006] The present invention discloses an adjustable dense mesh bracket, comprising a proximal bracket and a distal bracket, wherein the distal bracket is a mesh tube-like structure formed by weaving braided wires, and two adjacent braided wire ends of one end of the distal bracket close to the proximal end are connected to form a first sealed end; the proximal bracket is a mesh tube-like structure formed by weaving braided wires, and two adjacent braided wire ends of one end of the proximal bracket close to the distal end are connected to form a second sealed end; wherein the first sealed end and the second sealed end are interwoven and connected to form a sliding section, and the proximal bracket can slide in the sliding section when released.

[0007] Furthermore, the two adjacent seals on the first sealing end and the second sealing end are arranged with different lengths, and the long seal on the first sealing end is connected to the corresponding short seal on the second sealing end.

[0008] Furthermore, the first sealing end and / or the second sealing end is / are expanded.

[0009] Furthermore, the expansion angle of the first sealing end and / or the second sealing end is 5° to 30°.

[0010] Further, the end of the distal stent away from the first sealing end is a flared structure; or, the end of the proximal stent away from the second sealing end is a flared structure.

[0011] Furthermore, the braided wires of the distal stent and the proximal stent are made of one or more of nickel-titanium wire, cobalt-chromium wire, platinum-tungsten wire, platinum-iridium wire, and DFT wire, and the material of the braided wire of the distal stent is different from the material of the braided wire of the proximal stent.

[0012] Furthermore, the number of braided wires of the proximal stent is greater than or equal to the number of braided wires of the distal stent.

[0013] Furthermore, the metal coverage of the proximal stent is greater than or equal to the metal coverage of the distal stent.

[0014] Furthermore, the braided wire of the first sealing end and / or the second sealing end also has a rolling structure, and the rolling structure includes a slot hole provided on the braided wire and a ball that can rotate in any direction in the slot hole.

[0015] Furthermore, the second sealing end is provided with a one-way valve structure, and the one-way valve structure contacts the corresponding seal of the first sealing end to achieve one-way movement of the first sealing end in a direction away from the second sealing end.

[0016] Furthermore, the one-way valve structure includes two axially parallel fixed wires and a plurality of groups of symmetrically arranged inclined clamping wires between the two fixed wires, and a gap is provided between the two symmetrically arranged inclined clamping wires, and the gap is smaller than the diameter of the braided wire on the first sealing end;

[0017] The inclined card wire is configured so that when the second sealing end moves in a direction away from the first sealing end, the inclined card wire is pushed open by the movement of the seal, the gap becomes larger and the seal passes through; when moving in the opposite direction, the inclined card wire is supported to reduce the gap to prevent the seal from continuing to move.

[0018] The adjustable dense mesh bracket provided by the present invention can achieve the following technical effects:

[0019] The adjustable dense mesh stent of the present invention is provided with a first sealing end at one end of the distal stent close to the proximal end and a second sealing end at one end of the proximal stent close to the distal end, and a sliding section is formed by interweaving the first sealing end and the second sealing end, so that the proximal stent can slide a set distance relative to the distal stent when released. By setting up this length-adjustable structural form, the neck of the aneurysm can be fully covered, thereby improving the stability of the stent and avoiding the risks caused by being too long or too short.

[0020] The foregoing general description and the following description are exemplary and explanatory only and are not intended to limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] One or more embodiments are exemplarily described by corresponding drawings, and these exemplary descriptions and drawings do not limit the embodiments. Elements with the same reference numerals in the drawings are regarded as similar elements, and wherein:

[0022] Figure 1 Schematic diagram of the structure of an adjustable dense mesh support in an embodiment of the present invention;

[0023] Figure 2 In the embodiment of the present invention Figure 1 A local enlarged view of point A in FIG.

[0024] Figure 3 Another structural schematic diagram of an adjustable dense mesh support in an embodiment of the present invention;

[0025] Figure 4 In the embodiment of the present invention Figure 3 A local enlarged view of point B in FIG.

[0026] Figure 5 It is another structural schematic diagram of the adjustable dense mesh support in the embodiment of the present invention;

[0027] Figure 6 In the embodiment of the present invention Figure 5 A local enlarged view of point C in FIG.

[0028] Figure 7 It is a schematic diagram of the structure of the adjustable dense mesh stent when placed in a blood vessel in an embodiment of the present invention;

[0029] Figure 8 This is a schematic diagram of the structure of the rolling structure at the sealing portion in an embodiment of the present invention;

[0030] Fig. 9 Another structural schematic diagram of the rolling structure at the sealing portion in an embodiment of the present invention;

[0031] Fig.10 Schematic diagram of the one-way valve structure at the sealing portion in an embodiment of the present invention.

[0032] Reference numerals:

[0033] 1. Distal bracket; 11. First sealing end; 11a. Long sealing; 2. Proximal bracket; 21. Second sealing end; 21a. Short sealing; 3. Sliding section; 4. Rolling structure; 41. Slot hole; 42. Ball; 43. Sliding block; 5. One-way valve structure; 51. Fixed wire; 52. Inclined card wire. DETAILED DESCRIPTION

[0034] In order to be able to understand the features and technical contents of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0035] The terms "first", "second", etc. in the specification and claims of the embodiments of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so that the embodiments of the embodiments of the present disclosure described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0036] In the embodiments of the present disclosure, the terms "upper", "lower", "inside", "middle", "outside", "front", "back" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. These terms are mainly intended to better describe the embodiments of the present disclosure and their embodiments, and are not intended to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction. Moreover, in addition to being used to indicate directions or positional relationships, some of the above terms may also be used to indicate other meanings. For example, the term "upper" may also be used to indicate a certain dependency or connection relationship in certain circumstances. For those of ordinary skill in the art, the specific meanings of these terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0037] In addition, the terms "disposed", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0038] Unless otherwise specified, the term "plurality" means two or more and "plurality" means two or more.

[0039] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

[0040] First embodiment

[0041] The adjustable dense mesh bracket mentioned in this embodiment is as follows: Figure 1 to Figure 2 As shown in , the adjustable dense mesh stent includes a distal stent 1 and a proximal stent 2. In the present invention, the distal end refers to the end away from the operator when the operator is operating, and the proximal end refers to the end close to the operator. In an embodiment of the present invention, when the adjustable dense mesh stent is placed, after the microcatheter reaches the lesion position, the introduction sheath loaded with the adjustable dense mesh stent is docked with the microcatheter; the dense mesh stent is transported to the lesion through the microcatheter to release the stent.

[0042] Please refer to Figure 1 and Figure 2 In the embodiment of the present invention, the distal stent 1 is a mesh tube structure formed by weaving braided wires, and two adjacent braided wire ends at one end of the distal stent 1 close to the proximal end are connected to form a first sealing end 11; the proximal stent 2 is a mesh tube structure formed by weaving braided wires, and two adjacent braided wire ends at one end of the proximal stent 2 close to the distal end are connected to form a second sealing end 21; it should be pointed out here that, in the embodiment of the present invention, the sealing end refers to Figure 2 As shown in FIG. 1 , two adjacent braided wires are closed at the free ends. It should be noted that in the embodiment of the present invention, there is no restriction on the braiding angle of the braided wires, and there is no restriction on the closed shape of the sealed end. It can be as follows: Figure 2 The formation shown in the figure forms an arc structure at the closed position, which can also be as shown in the figure. Figure 8 wherein the first sealing end 11 and the second sealing end 21 are interwoven to form a sliding section 3, and the proximal stent 2 can slide in the sliding section 3 of the distal stent 1 when released. Figure 8 As shown in the figure, two braided wires at a seal of the first sealing end 11 enter into a seal of the second sealing end 21 from the front and rear sides of the second sealing end 21 respectively, and are connected inside the seal, so that the second sealing end 21 can move inside the first sealing end 11.

[0043] When placing the stent, the distal stent 1 can be slowly released first, so that the distal stent 1 is gradually released and restored to shape in the blood vessel. After the distal stent 1 is placed, the proximal stent 2 is placed. At this time, the distance between the first sealing end 11 and the second sealing end 21 between the sliding section 3 can also be adjusted. The position of the proximal stent 2 is adjusted by pushing and pulling the guide wire, so that the overall length of the stent will not be too short to fall into the aneurysm, nor too long to avoid further formation of thrombus; through the setting of the sliding section 3, the overall length of the stent composed of the distal stent 1 and the proximal stent 2 can be adjusted, thereby ensuring full coverage of the aneurysm neck. It should be pointed out here that those skilled in the art can set the specific size as needed. In some embodiments of the present invention, the diameters of the proximal stent 2 and the distal stent 1 can be set to be the same, or the diameter of the proximal stent 2 can be set to be larger than the diameter of the distal stent 1, so as to further improve the reliability of the fixation of the stent as a whole in the blood vessel after release; in addition, the diameter of the sealing end of the distal stent 1 can be set to be greater than or equal to the diameter of the sealing end of the proximal stent 2. Specifically, in some embodiments of the present invention, the diameter of the stent is set to 2 mm to 10 mm, and the sliding distance of the sliding section 3 is set to 1 mm to 15 mm. In addition, in the embodiments of the present invention, the density of the overlapping area is also increased by setting the sliding section 3, thereby providing better support and guiding function for blood, preventing blood from flowing into the aneurysm, and promoting the closure and shedding of the aneurysm.

[0044] In the above embodiment, a first sealing end 11 is provided at the proximal end of the distal stent 1 and a second sealing end 21 is provided at the distal end of the proximal stent 2, and a sliding section 3 is formed by interweaving the first sealing end 11 and the second sealing end 21, so that the proximal stent 2 can slide a set distance relative to the distal stent 1 when released. By setting such a length-adjustable structural form, the aneurysm neck can be fully covered, thereby improving the stability of the stent and avoiding the risks caused by being too long or too short.

[0045] In the embodiment of the present invention, in the prior art, when a dense mesh stent is implanted in a long lesion, kinking is prone to occur. In the embodiment of the present invention, since there is a sliding section 3 between the distal stent 1 and the proximal stent 2, the sliding section 3 can not only adjust the distance in the axial direction, but also achieve a certain angle of relative rotation in the circumferential direction, thereby reducing the influence of the distal end distortion on the proximal end, thereby reducing the occurrence of kinking; in addition, in order to further enhance the structural stability of the stent, such as Figure 3 and Figure 4As shown in , in some embodiments of the present invention, the two adjacent seals on the first sealing end 11 and the second sealing end 21 are arranged with different lengths, and the long seal 11a on the first sealing end is connected to the short seal 21a on the corresponding second sealing end 21. Through this structural design of different lengths, better support can be provided when the aneurysm is large in size or irregular in shape. On the other hand, through this uneven design, the sealing and stability of the stent can be improved, blood outflow from the aneurysm can be reduced, and the risk of postoperative complications can be reduced.

[0046] In a conventional dense mesh stent structure, in order to improve the structural stability of the implanted dense mesh stent, anchoring structures are often provided at both ends. In the embodiment of the present invention, in order to further improve the stability of the anchoring, Figure 5 and Figure 6 As shown in the embodiment of the present invention, the first sealing end 11 or the second sealing end 21 is expanded. The expansion here means that the diameter of the outermost end of the sealing end is larger than the diameter of the inner end, so that the first sealing end 11 or the second sealing end 21 presents as follows Figure 6 The trumpet-shaped structure shown in the figure, of course, it should be pointed out here that, in an embodiment of the present invention, the diameter of the first sealing end 11 can be set to be larger than the diameter of the second sealing end 21, so that the distal stent 1 can be anchored after the placement is completed. Of course, the first sealing end 11 and the second sealing end 21 can also be set to a flared shape to further improve the reliability of anchoring; in some embodiments of the present invention, the flaring angle of the first sealing end 11 or the second sealing end 21 is 5°~30°, and the 5°~30° here can refer to the first sealing end 11 or the second sealing end 21, or the first sealing end 11 and the second sealing end 21 can be set to the same flaring angle.

[0047] In addition, in an embodiment of the present invention, the end of the distal stent 1 away from the first sealing end 11 is a flared structure, or the end of the proximal stent 2 away from the second sealing end 21 is a flared structure. Through the setting of this structure, the stent as a whole has more anchoring points compared with the prior art, thereby further improving the stability of the stent in the blood vessel. In some specific embodiments of the present invention, the material of the braided wire in the stent is multiple, for example, the braided wire of the distal stent 1 and the proximal stent 2 is one or more of nickel-titanium wire, cobalt-chromium wire, platinum-tungsten wire, platinum-iridium wire, and DFT wire, and the material of the braided wire of the distal stent is different from the material of the braided wire of the proximal stent. It should be pointed out here that DFT refers to direct fiber technology, and DFT wire refers to a braided wire composited with a variety of fiber materials. This braided wire is intended to improve the mechanical properties, corrosion resistance and biocompatibility of the braided wire by combining the excellent properties of different materials. In some embodiments of the present invention, the material and quantity of the braided wire can be selected as needed, for example, the number of braided wires of the proximal stent 2 is greater than or equal to the number of braided wires of the distal stent 1. By increasing the number of braided wires of the proximal stent 2, its compression resistance can be enhanced to ensure the stability of the stent after placement; by increasing the number of braided wires, the overall load-bearing capacity of the stent can be improved to ensure effective support for the aneurysm. In addition, in order to further optimize the performance and function of the stent, in some embodiments of the present invention, the metal coverage of the dense mesh stent is between 20% and 50%, and the metal coverage of the proximal stent 2 is greater than or equal to the metal coverage of the distal stent 1. It should be pointed out here that in some specific embodiments of the present invention, the diameter of the braided wire is in the range of 0.02mm to 0.04mm, and the number of braided wires can be 16 to 144, etc., which can be set by those skilled in the art according to actual needs.

[0048] Second embodiment

[0049] This embodiment also proposes an adjustable dense mesh bracket. The second embodiment is a further improvement based on the first embodiment. The specific solution is as follows:

[0050] like Figure 8 As shown in, in the second embodiment of the present invention, in order to reduce the resistance of the distal stent 1 and the proximal stent 2 during the relative sliding process, it is prevented that the proximal stent 2 drives the movement of the distal stent 1 when moving away from the distal stent 1, thereby preventing the distal stent 1 from moving again after being anchored in the blood vessel, thereby preventing vascular damage or position deviation; in the second embodiment of the present invention, as Figure 8As shown in the figure, the braided wire of the first sealing end 11 or the second sealing end 21 also has a rolling structure 4. Of course, it should be pointed out here that the rolling structure 4 is used to reduce the friction when the sealing ends move relative to each other. The rolling structure 4 can be set on the first sealing end 11 or the second sealing end 21 alone, or on both the first sealing end 11 and the second sealing end 21. Regarding the specific structure of the rolling structure 4, in the embodiment of the present invention, as shown in FIG. Figure 8 As shown in , the rolling structure 4 includes a slot 41 provided on the braided wire and a ball 42 that can rotate in any direction in the slot 41. It should be noted here that the structure of the ball 42 and the slot 41 in the embodiment of the present invention is similar to the structure of the ball on the tip of a ballpoint pen and the slot matched therewith; in the embodiment of the present invention, the slot 41 can be directly provided on the braided wire; it should be noted here that when processing is carried out specifically, it can be realized by precision injection molding, laser cutting and welding, 3D printing and other processes.

[0051] Alternatively, if Fig. 9 As shown in, in some embodiments of the present invention, the above-mentioned rolling structure 4 can also be provided with a slider 43 on the braided wire, and the slot 41 is opened on the slider 43. The slider 43 is cylindrical, with rounded corners at both ends, and can be relatively slidably arranged on the braided wire. In an embodiment of the present invention, the diameter of the opening of the slot 41 is slightly smaller than the diameter of the ball 42, and the installation of the ball 42 is achieved through clearance fit; so that the installed ball 42 can roll and rub with the braided wire on the corresponding seal, thereby reducing the friction force when the proximal bracket 2 moves relative to the distal bracket 1, thereby reducing the risk of displacement of the distal bracket 1 when the proximal bracket 2 is adjusted.

[0052] Third embodiment

[0053] This embodiment also proposes an adjustable dense mesh bracket. The third embodiment is a further improvement based on the first or second embodiment. The specific solution is as follows:

[0054] like Fig.10 As shown in , in the third embodiment of the present invention, the second sealing end 21 is further provided with a one-way valve structure 5, and the one-way valve structure 5 is in contact with the corresponding seal of the first sealing end 11 to achieve one-way movement of the first sealing end 11 in the direction away from the second sealing end 21. The one-way here means that the proximal stent 2 can only move in the direction away from the distal stent 1, and cannot move in the direction close to the distal stent 1; in the embodiment of the present invention, when the distal stent 1 and the proximal stent 2 are pre-fixed in the microcatheter, the distance between the distal stent 1 and the proximal stent 2 is adjusted to the shortest, and the physician can increase the overall length of the stent as needed; by setting this structural form, the stability of the stent placement can be improved; specifically, as Fig.10As shown in the figure, the one-way valve structure 5 includes two axially parallel fixed wires 51 and several groups of inclined card wires 52 symmetrically arranged between the two fixed wires 51, and there is a gap between the two symmetrically arranged inclined card wires 52, which is smaller than the diameter of the braided wire on the first sealing end 11; the inclined card wire 52 is configured so that when the second sealing end 21 moves toward a direction away from the first sealing end 11, the inclined card wire 52 is pushed away by the movement of the seal, and the gap becomes larger to allow the seal to pass; when moving in the opposite direction, the inclined card wire 52 is supported to make the gap smaller to prevent the seal from continuing to move. That is, in the embodiment of the present invention, the two inclined card threads 52 are inclined toward the right side, that is, inclined toward the direction away from the seal. Through this structural setting, when the seal moves in the direction away from the seal, the two inclined card threads 52 can be pushed outward, so that the free ends of the two inclined card threads 52 are bent, thereby causing the gap between the two inclined card threads 52 to increase, thereby allowing the braided wire on the seal to pass through; but when moving in the opposite direction, the free ends of the two inclined card threads 52 are pushed toward the gap when subjected to external force, thereby squeezing the gap smaller until it disappears. In this way, Fig.10 As shown in , the seal can only move from left to right, and cannot move from right to left. This structural setting improves the overall stability of the bracket, avoids position changes after the bracket is placed, and improves product reliability.

[0055] The above description and the accompanying drawings sufficiently illustrate the embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Unless explicitly required, individual components and functions are optional, and the order of operations may vary. Portions and features of some embodiments may be included in or replace portions and features of other embodiments. The embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. An adjustable dense mesh bracket, characterized in that: include: A distal stent, which is woven from braided wires to form a mesh tube-like structure, wherein two adjacent braided wire ends at one end of the distal stent close to the proximal end are connected to form a first sealed end; A proximal stent, which is a mesh tube-like structure formed by braiding wires, wherein two adjacent ends of the braided wires at one end of the proximal stent close to the distal end are connected to form a second sealed end; The first sealing end and the second sealing end are interwoven and connected to form a sliding section, and the proximal stent can slide in the sliding section when released.

2. The adjustable dense mesh bracket according to claim 1, characterized in that: The two adjacent seals on the first sealing end and the second sealing end are arranged with different lengths, and the long seal on the first sealing end is connected with the corresponding short seal on the second sealing end.

3. The adjustable dense mesh bracket according to claim 1, characterized in that: The first sealing end and / or the second sealing end is / are expanded.

4. The adjustable dense mesh bracket according to claim 3, characterized in that: The expansion angle of the first sealing end and / or the second sealing end is 5° to 30°.

5. The adjustable dense mesh bracket according to claim 1, characterized in that: The end of the distal stent away from the first sealing end is a flared structure; or the end of the proximal stent away from the second sealing end is a flared structure.

6. The adjustable dense mesh bracket according to claim 1, characterized in that: The braided wires of the distal stent and the proximal stent are made of any one or more of nickel-titanium wire, cobalt-chromium wire, platinum-tungsten wire, platinum-iridium wire, and DFT wire, and the material of the braided wire of the distal stent is different from the material of the braided wire of the proximal stent.

7. The adjustable dense mesh bracket according to claim 6, characterized in that: The number of braided wires of the proximal stent is greater than or equal to the number of braided wires of the distal stent.

8. The adjustable dense mesh bracket according to claim 6, characterized in that: The metal coverage of the proximal stent is greater than or equal to the metal coverage of the distal stent.

9. The adjustable dense mesh bracket according to claim 1, characterized in that: The braided wire of the first sealing end and / or the second sealing end also has a rolling structure, and the rolling structure includes a slot hole arranged on the braided wire and a ball that can rotate in any direction in the slot hole.

10. The adjustable dense mesh bracket according to claim 9, characterized in that: The second sealing end is also provided with a one-way valve structure, and the one-way valve structure contacts the corresponding seal of the first sealing end to achieve one-way movement of the first sealing end in a direction away from the second sealing end.

11. The adjustable dense mesh bracket according to claim 10, characterized in that: The one-way valve structure comprises two axially parallel fixed wires and a plurality of groups of symmetrically arranged inclined clamping wires between the two fixed wires, wherein a gap is provided between the two symmetrically arranged inclined clamping wires, and the gap is smaller than the diameter of the braided wire on the first sealing end; The inclined card wire is configured so that when the second sealing end moves in a direction away from the first sealing end, the inclined card wire is pushed open by the movement of the seal, the gap becomes larger and the seal passes through; when moving in the opposite direction, the inclined card wire is supported to reduce the gap to prevent the seal from continuing to move.

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