Self-locking device for stent recovery, stent, and stent recovery method
By utilizing the shrinkage line and self-locking coil group in the self-locking device, the self-locking of the support is achieved by friction, which solves the reliability and cost problems in the recycling process of complex structure supports, and achieves the effect of simplifying the recycling process and improving reliability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-19
- Publication Date
- 2026-03-06
AI Technical Summary
Existing complex structure support recycling devices suffer from poor reliability, high production costs, and susceptibility to failure. In particular, the recycling process for rivet-structure supports is complex and difficult to achieve reliable self-locking.
A self-locking device is adopted, including a shrink line and a self-locking coil assembly. The self-locking of the support is achieved through friction. The friction inside the shrink line generates resistance against the expansion of the support, ensuring that the support is self-locked in the specified state.
It simplifies the stent recycling process, improves reliability, reduces production costs, decreases the occurrence of failures, and enhances engineering efficiency and safety.
Smart Images
Figure CN118948508B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of medical devices, and more specifically, to a self-locking device for stent retrieval, a stent, and a stent retrieval method. Background Technology
[0002] Retrieval of complex stent structures remains a challenging problem in the current technological field. Stents with rivet-like structures, in particular, present significant difficulties during retrieval, and the longer the retrieval journey, the more complex the design of the retrieval equipment becomes. To address this issue, a retrieval line and its self-locking mechanism are typically required. However, existing technologies are complex, have poor reliability, and cannot meet engineering requirements.
[0003] Specifically, existing rivet-structured supports often require complex retrieval lines and locking functions during the retrieval process. Implementing these lines and functions necessitates intricate engineering design and manufacturing processes, leading to increased production costs and decreased reliability. Furthermore, the complexity of these retrieval lines and locking functions makes them prone to malfunctions during actual use, further impacting project efficiency and safety.
[0004] In view of this, the present invention provides the following technical solution. Summary of the Invention
[0005] The present invention aims to provide, for example, a self-locking device for stent retrieval, a stent, and a stent retrieval method, which have a simple structure and high reliability.
[0006] The embodiments of the present invention can be implemented as follows:
[0007] In a first aspect, the present invention provides a self-locking device for stent retrieval, comprising a retraction line, the retraction line comprising:
[0008] The coil is used to retrieve the hook;
[0009] The self-locking section is connected to the recovery hook coil;
[0010] A shrinking loop segment is used to be wound around the support body to be recycled and form a shrinking loop. One end of the shrinking loop segment is connected to the end of the self-locking segment away from the recycling hook coil.
[0011] A self-locking coil assembly is used to form a self-locking coil assembly by winding it on the self-locking section, and one end of the self-locking coil assembly is connected to the end of the shrink coil section away from the self-locking section.
[0012] A fixing section is used to fix one end of the self-locking coil assembly section away from the shrink coil section onto the support body to be recycled.
[0013] In an optional embodiment, the shrink line further includes a recovery hook coil segment, which is formed by creating a double-strand single knot to form the recovery hook coil.
[0014] In an optional embodiment, the coefficient of friction between the shrinkage lines is ≥0.2.
[0015] In an optional embodiment, the number of turns in the self-locking coil group is 2-20.
[0016] In an optional embodiment, both ends of the self-locking coil group are provided with fixing sections to prevent the self-locking coil group from spreading out;
[0017] Preferably, the number of turns of the coil in the self-locking coil group is 7-20 turns.
[0018] In an optional embodiment, a self-locking ball is further included. The self-locking ball has a receiving cavity for accommodating the self-locking coil group. The receiving cavity has a first through hole for the self-locking segment to pass through. A winding window is provided on one side of the axis of the first through hole. A winding post is provided on the winding window that is parallel to the axis of the first through hole. The winding post is located inside the self-locking coil group.
[0019] Preferably, the number of turns of the coil in the self-locking coil group is 2-5 turns.
[0020] Secondly, the present invention provides a bracket, including a bracket body and a self-locking device as described in any of the foregoing embodiments, wherein the retraction section of the self-locking device is wound around the bracket body to be retracted to form a retraction ring, and the fixing section is fixed to the bracket body.
[0021] In an optional embodiment, the support body includes a wave-shaped frame with fixing spikes on the outer side of the frame.
[0022] In an optional embodiment, the coil to be contracted is arranged around the support body 1-2 times;
[0023] And / or, the recovery hook coil is located inside the support body.
[0024] Thirdly, the present invention provides a method for retrieving a stent as described in any of the foregoing embodiments, comprising: using a retrieval hook to hook the retrieval hook coil, with an end cap located outside the retrieval hook abutting against the self-locking coil assembly; then pulling the retrieval hook to retract the stent body; subsequently removing the tension applied by the retrieval hook to stabilize the stent body to a specified retracted state before retrieving it, wherein the tension used when pulling the retrieval hook to retract the stent body satisfies F. 收 >F 摩擦 +F弹 or F 收 >F 摩擦 +Fˋ 摩擦 +F 弹 When the support body stabilizes to a specified contraction state, it satisfies F. 摩擦 >F 弹 or F 摩擦 +Fˋ 摩擦 >F 弹 F 摩擦 F' is the frictional force between the self-locking section and the self-locking coil assembly. 摩擦 F is the frictional force between the self-locking section and the winding post. 弹 The elastic force that needs to be overcome for the contraction of the stent body.
[0025] The beneficial effects of the embodiments of the present invention include, for example:
[0026] In this embodiment of the invention, the self-locking coil assembly and the self-locking section work together to utilize the frictional force inside the shrinking wire to generate resistance against the unfolding of the support, thereby achieving the function of self-locking the support in a specified state after it is compressed. This solves the problems of high difficulty in recycling, complex structure, and poor reliability of supports with complex rivet structures. Attached Figure Description
[0027] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0028] Figure 1 A schematic diagram of a support structure with a self-locking device for support retrieval;
[0029] Figure 2 for Figure 1 Schematic diagram of the stent in its contracted state;
[0030] Figure 3 A schematic diagram of another type of support with a self-locking device for support retrieval;
[0031] Figure 4 for Figure 3 A schematic diagram of the structure of the self-locking ball used in the process;
[0032] Figure 5 for Figure 3 A schematic diagram of the stent in its contracted state.
[0033] Icons: 100 - Shrink coil; 110 - Recover hook coil; 120 - Self-locking section; 130 - Shrink coil section; 140 - Self-locking coil group; 141 - Double strand single knot; 150 - Fixed section; 200 - Self-locking ball; 210 - First through hole; 220 - Winding window; 230 - Winding post; 300 - Support body; 310 - Fixed spike. Specific Implementation
[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0035] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.
[0036] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0037] In the description of this invention, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.
[0038] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.
[0039] It should be noted that, where there is no conflict, the features in the embodiments of the present invention can be combined with each other.
[0040] Please refer to Figures 1-5 This embodiment provides a self-locking device for stent retrieval, including a retraction line 100, the retraction line 100 comprising:
[0041] The recovery hook coil 110 is used to interact with the recovery hook.
[0042] The self-locking section 120 is connected to the recovery hook coil 110;
[0043] The shrinking section 130 is used to be wound around the support body 300 to be recycled and form a shrinking section. One end of the shrinking section 130 is connected to the end of the self-locking section 120 away from the recycling hook coil 110.
[0044] Self-locking coil group 140 segment is used to be wound on the self-locking segment 120 to form self-locking coil group 140, and one end of the self-locking coil group 140 segment is connected to the end of the shrink coil segment 130 away from the self-locking segment 120.
[0045] The fixing section 150 is used to fix one end of the self-locking coil group 140 away from the shrink coil section 130 onto the bracket body 300 to be recycled.
[0046] This invention provides a self-locking device for stent retrieval. The retraction line 100 is a continuous line, comprising a retrieval hook coil 110, a self-locking section 120, a retraction coil section 130, a self-locking coil group 140, and a fixing section 150 connected in sequence. Figure 1 or Figure 3 As shown, when the bracket body 300 to be retrieved needs to be self-locked, the retrieval hook can be used to pull the retrieval hook coil 110. At this time, a tensile force will be generated inside the entire bracket body 100, the contraction coil section 130 will tighten, and the self-locking coil group 140 will contract to hold the self-locking section 120. At the same time, when the bracket body 300 to be retrieved has contracted to a certain extent, if the retrieval hook is released, the tensile force generated inside the contraction line 100 by pulling the retrieval hook coil 110 will disappear. However, since the bracket to be retrieved has a tendency to recover its deformation, a tensile force will still be generated inside the contraction line 100. At this time, the tensile force starts to tighten from the side of the self-locking coil away from the retrieval hook coil 110 and gradually passes towards the side closer to the retrieval hook coil 110. This further increases the friction between the self-locking coil group 140 and the self-locking section 120 and is conducive to a relatively balanced friction between each coil in the self-locking coil group 140 and the self-locking section 120. Figure 2 and Figure 5 As shown.
[0047] It should be noted that the self-locking of the bracket body 300 to be recycled can be achieved as long as the frictional force on the self-locking section 120 is greater than the elastic force generated by the recovery deformation of the bracket body 300 to be recycled.
[0048] It should be noted that the retraction cord 100 in this embodiment is a continuous cord. The retrieval hook coil 110, self-locking segment 120, retraction coil segment 130, self-locking coil group 140, and fixing segment 150 are only for the convenience of segmenting and describing the various parts of the retraction cord 100. The material can be a flexible cord that meets the implantation requirements, such as HDPE. The stents in this application include, but are not limited to, gastric bypass stents and dense mesh esophageal stents.
[0049] In this embodiment of the invention, the self-locking coil group 140 and the self-locking section 120 cooperate to generate resistance against the unfolding of the support by utilizing the friction force inside the shrink line 100, thereby achieving the function of self-locking in a specified state after the support is compressed, thus solving the problems of high difficulty in recovery, complex structure and poor reliability of the support with complex rivet structure.
[0050] In an optional embodiment, the shrink line 100 further includes a recovery hook coil 110 segment, which is formed by a double-strand single knot 141 to form the recovery hook coil 110.
[0051] In some embodiments, although an additional hook loop can be provided on the shrink line 100 as a retrieval hook coil 110, the additional hook loop increases cost and assembly difficulty. Other structures can also be made as the retrieval hook coil 110, but the hook loop may gradually shrink under the action of the retrieval hook. During the shrinking process, the shrink line 100 and the retrieval hook will move relative to each other. Since the hook loop is thin and the space is small, if the hook loop and the shrink line 100 move relative to each other, the shrink line 100 will be subject to greater friction and may break. Therefore, using a double-strand single knot 141 made from the retrieval hook coil 110 segment to form the retrieval hook coil 110 can improve the reliability of the device.
[0052] In an optional embodiment, the coefficient of friction between the shrinkage lines 100 is ≥0.2.
[0053] In this embodiment, the self-locking coil assembly 140 achieves self-locking of the self-locking section 120 through friction between the coil assembly 140 and the self-locking section 120. The increased coefficient of friction between the coil 100 and the coil 100 helps to reduce the contact area between them and thus reduces the number of turns in the self-locking coil assembly 140.
[0054] In an optional embodiment, the number of turns of the coil in the self-locking coil group 140 is 2-20 turns to ensure that the self-locking device can self-lock.
[0055] In an optional embodiment, both ends of the self-locking coil assembly 140 are provided with fixing sections to prevent the self-locking coil assembly 140 from spreading out.
[0056] Preferably, the number of turns of the coil in the self-locking coil group 140 is 7-20 turns.
[0057] In some embodiments, the fixing section may be formed by knotting the shrink wire 100. In other embodiments, other structures may be used that allow the coils in the self-locking coil to be arranged relatively tightly, without affecting the self-locking coil's grip on the self-locking segment 120 and the movement of the self-locking segment 120 relative to the self-locking coil group 140.
[0058] In optional embodiments, a self-locking ball 200 is also included, such as... Figure 4 As shown, the self-locking ball 200 is provided with a receiving cavity for accommodating the self-locking coil group 140. The receiving cavity is provided with a first through hole 210 for the self-locking section 120 to pass through. A winding window 220 is provided on one side of the axis of the first through hole 210. A winding post 230 parallel to the axis of the first through hole 210 is provided on the winding window 220. The winding post 230 is located inside the self-locking coil group 140.
[0059] Preferably, the number of turns of the coil in the self-locking coil group 140 is 2-5 turns.
[0060] The use of a self-locking ball 200 allows the coils in the self-locking coil to be arranged relatively tightly without affecting the self-locking coil's grip on the self-locking section 120 or the movement of the self-locking section 120 relative to the self-locking coil group 140. The self-locking ball 200 also prevents the self-locking section 120 of the shrinking wire 100 from bending or knotting, which could cause the self-locking device to jam. Specifically, each end of the self-locking ball 200 has a first through hole 210, and both ends of the self-locking section 120 pass through the first through hole 210. A winding window 220 is provided on one side of the self-locking ball 200 of the self-locking section 120. After the self-locking coil group 140 enters the self-locking ball 200, it is wound on both the self-locking section 120 and the winding post 230.
[0061] When the bracket body 300 to be retrieved needs to be self-locked, the retrieval hook can be used to pull the retrieval hook coil 110. At this time, a tensile force will be generated inside the entire bracket body 300, the contraction coil section 130 will tighten, and the self-locking coil group 140 will contract to hold the self-locking section 120 and the winding post 230. At the same time, when the bracket body 300 to be retrieved is contracted to a certain extent, if the retrieval hook is released, the tensile force generated inside the contraction line 100 by pulling the retrieval hook coil 110 will disappear. However, since the bracket to be retrieved has a tendency to recover its deformation, a tensile force will still be generated inside the contraction line 100. At this time, the tensile force starts to tighten from the side of the self-locking coil away from the retrieval hook coil 110 and gradually passes to the side closer to the retrieval hook coil 110. This further increases the friction between the self-locking coil group 140, the self-locking section 120, and the winding post 230, and is conducive to the relative balance of friction between each coil in the self-locking coil group 140 and the self-locking section 120.
[0062] It should be noted that the self-locking ball 200 can be made of metal or polymer material. In some embodiments, the self-locking ball 200 can be green. The coefficient of friction between the winding post 230 and the shrinking line 100, and between the shrinking lines 100, is greater than 0.2. Specifically, the self-locking device only needs to ensure that the frictional force on the self-locking section 120 is greater than the elastic force required for the support to recover its deformation when the shell shrinks to a preset diameter. In some embodiments, in order to ensure sufficient contact between the winding post 230 and the self-locking line without affecting the movement of the self-locking line, the winding post 230 and the self-locking line can be tangential.
[0063] This invention also provides a bracket, including a bracket body 300 and a self-locking device as described in any of the preceding embodiments. The retraction section 130 of the self-locking device is wound around the bracket body 300 to be retracted to form a retraction ring, and the fixing section 150 is fixed on the bracket body 300.
[0064] In this embodiment, the retraction coil section 130 of the self-locking device is wound around the bracket body 300 to form a retraction coil. When the retrieval hook hooks the retrieval hook coil 110, the retrieval hook hook coil drives the retraction coil to retract, so that the bracket body 300 retracts under the action of the retraction coil.
[0065] The fixing segment 150 is fixed to the bracket body 300. Specifically, the fixing segment 150 can be made into multiple single sections or other line segment structures that can fix the fixing segment 150 to the bracket body 300. In some embodiments, additional connection structures can also be used to fix the fixing segment 150 to the bracket body 300.
[0066] In an optional embodiment, the support body 300 includes a wave-shaped frame, and a fixing spike 310 is provided on the outer side of the frame.
[0067] It should be noted that when the support structure is as described, the shrinkage line 100 can be directly threaded around the support. Figure 1 As shown, when the support structure is otherwise inconvenient to fix the shrinkage line 100, the shrinkage line 100 can also be threaded around the membrane tube sleeved on the support.
[0068] In an optional embodiment, the shrinkable coil is arranged around the support body 300 1-2 times. It should be noted that when the shrinkable coil is less than one turn around the support body 300, the support not covered by the shrinkable coil will be stretched when the retrieval hook pulls the retrieval hook coil 110, which is not conducive to the uniform shrinkage of the support. However, if the number of shrinkable coils is too large, the stroke required for the support to self-lock will increase. Therefore, the number of turns of the shrinkable coil around the support body 300 should not be too many or too few. Preferably, the shrinkable coil is arranged around the support body 300 once. Figure 1 As shown.
[0069] In an optional embodiment, the retrieval hook coil 110 is located inside the support body 300.
[0070] In an optional embodiment, the retrieval hook coil 110 is located inside the support body 300, and when the retrieval hook pulls the retrieval hook coil 110 to move the support, it is easier to maintain the balance of the support.
[0071] This invention also provides a method for retrieving the stent described in any of the foregoing embodiments, comprising: using a retrieval hook to hook the retrieval hook coil 110, with the end cap located outside the retrieval hook abutting against the self-locking coil assembly 140; then pulling the retrieval hook to retract the stent body 300; then removing the tension applied by the retrieval hook to stabilize the stent body 300 to a specified retracted state before retrieving it; wherein the tension used when pulling the retrieval hook to retract the stent body 300 satisfies F 收 >F 摩擦 +F 弹 or F 收 >F 摩擦 +Fˋ 摩擦 +F 弹 When the support body stabilizes to a specified contraction state, it satisfies F. 摩擦 >F 弹 or F 摩擦 +Fˋ 摩擦 >F 弹 F 摩擦 F is the frictional force between the self-locking section 120 and the self-locking coil group 140. 弹 The elastic force that needs to be overcome for the support body 300 to contract.
[0072] First Experimental Example
[0073] This embodiment provides a Figure 1 The short-range retrieval method for the stent includes: using a retrieval hook to hook the retrieval hook coil 110, with the end cap located outside the retrieval hook abutting against the self-locking coil assembly 140; then pulling the retrieval hook to retract the stent body 300; next, removing the tension applied by the retrieval hook to stabilize the stent body 300 to a specified retracted state before retrieval; wherein the tension used when pulling the retrieval hook to retract the stent body 300 satisfies F. 收 >F 摩擦 +F 弹 When the support body stabilizes to a specified contraction state, it satisfies F. 摩擦 >F 弹 or F 摩擦 +Fˋ 摩擦 >F 弹 F 摩擦 F' is the frictional force between the self-locking section 120 and the self-locking coil assembly 140. 摩擦 F is the frictional force between the self-locking section 120 and the winding post 230. 弹 The elastic force that needs to be overcome for the contraction of the support body 300, wherein, Figure 1 Some parameters of the bracket are shown in Table 1, where F is adjusted by adjusting the number of turns of the self-locking coil group. 摩擦 Size.
[0074] Table 1
[0075]
[0076] Note: If, during the retrieval process, the external tension is removed, the support can maintain a stable, balanced, and static state under a certain contraction state (i.e., the support diameter is smaller than its diameter when no external force is applied), this can be defined as self-locking, i.e., F. 摩擦 Greater than F-ball.
[0077] Self-locking diameter: After the stent is compressed to its minimum diameter, the retrieval hook is released, and the stent will expand and rebound. When the rebound force of the stent is balanced with the self-locking force, it reaches a stable state. At this time, the diameter of the root of the stent is measured, which is the self-locking diameter.
[0078] Second Experimental Example
[0079] This embodiment provides a Figure 3The short-range retrieval method for the stent includes: using a retrieval hook to hook the retrieval hook coil 110, with the end cap located outside the retrieval hook abutting against the self-locking coil assembly 140; then pulling the retrieval hook to retract the stent body 300; next, removing the tension applied by the retrieval hook to stabilize the stent body 300 to a specified retracted state before retrieval; wherein the tension used when pulling the retrieval hook to retract the stent body 300 satisfies F. 收 >F 摩擦 +F` 摩擦 +F 弹 When the support body stabilizes to a specified contraction state, it satisfies F. 摩擦 >F 弹 or F 摩擦 +F` 摩擦 >F 弹 F 摩擦 F` is the frictional force between the self-locking section 120 and the self-locking coil assembly 140. 摩擦 F is the frictional force between the self-locking section 120 and the winding post 230. 弹 The elastic force that the support body 300 needs to overcome during contraction is specified. The support body 300 and the contraction line 100 are made of the same materials and specifications as those used in the first experimental example. Figure 3 Some parameters of the bracket are shown in Table 2, where F is adjusted by adjusting the number of turns in the self-locking coil group and the material of the winding post. 摩擦 Size.
[0080] Table 2
[0081]
[0082] Note: If, during the retrieval process, the external tension is removed, the support can maintain a stable, balanced, and static state under a certain contraction state (i.e., the support diameter is smaller than its diameter when no external force is applied), this can be defined as self-locking, i.e., F. 摩擦 +F` 摩擦 Greater than F 弹 .
[0083] Self-locking diameter: After the stent is compressed to its minimum diameter, the retrieval hook is released, and the stent will expand and rebound. When the rebound force of the stent is balanced with the self-locking force, it reaches a stable state. At this time, the diameter of the root of the stent is measured, which is the self-locking diameter.
[0084] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.
Claims
1. A stent, characterized by, The self-locking device comprises a shrink thread, which comprises: a recovery hook taking coil for acting with a recovery hook; a self-locking segment connected to the recovery hook taking coil; a shrink coil segment for being wound around the stent body to be recovered and forming a shrink coil, one end of the shrink coil segment being connected to one end of the self-locking segment away from the recovery hook taking coil; a self-locking coil group segment for forming a self-locking coil group around the self-locking segment, one end of the self-locking coil group segment being connected to one end of the shrink coil segment away from the self-locking segment; a fixing segment for fixing one end of the self-locking coil group segment away from the shrink coil segment on the stent body to be recovered; a self-locking ball, which is internally provided with an accommodating cavity for accommodating the self-locking coil group, the accommodating cavity being provided with a first through hole for the self-locking segment to pass through, one side of the axis of the first through hole being provided with a winding window, the winding window being provided with a winding column parallel to the axis of the first through hole, the winding column being located inside the self-locking coil group; the shrink coil segment of the self-locking device is wound around the stent body to be recovered to form a shrink coil, and the fixing segment is fixed on the stent body. The shrink thread further comprises a recovery hook taking coil segment, which is made into a double-stranded single knot to form the recovery hook taking coil.
2. The stent of claim 1, wherein The friction coefficient between the shrink threads is greater than or equal to 0.
2.
3. The stent of claim 1, wherein The number of coils in the self-locking coil group is 2-20.
4. The stent of claim 1, wherein Both ends of the self-locking coil group are provided with fixing knots for preventing the self-locking coil group from being scattered.
5. The stent defined in Claim 1, wherein, The number of coils in the self-locking coil group is 7-20.
6. The stent defined in Claim 5, wherein, The number of coils in the self-locking coil group is 2-5.
7. The stent defined in Claim 1, wherein The stent body comprises a wave-shaped frame, and the frame is externally provided with fixing spikes.
8. The stent defined in Claim 1, wherein, The shrink coil is wound around the stent body for 1-2 turns.
9. The stent defined in Claim 1, wherein, And / or, the recovery hook taking coil is located inside the stent body.
Citation Information
Patent Citations
Duodenum stent and medical instrument
CN217525519U
Self-locking tension-reducing wire with triangular braided structure
CN220801060U