Support system

Abstract

The invention relates to a stent system which comprises a tubular stent, a conveyor, a first stay wire and a second stay wire, the stent comprises a covered stent and a bare stent, the bare stent is arranged at the far end of the covered stent, one end of the first stay wire is connected with the conveyor, and the other end of the first stay wire penetrates out of the conveyor; the first stay wire extends in the circumferential direction of the bare stent after passing through the covered stent and is detachably connected with the bare stent, and the first stay wire moves to drive the bare stent to retract or expand; one end of the second wire drawing wire is connected with the near end side of the conveyor, the other end of the second wire drawing wire penetrates out of the conveyor, the covered stent extends in the circumferential direction of the far end of the covered stent and is detachably connected with the covered stent, and the movement of the second wire drawing wire can drive part of the covered stent to retract or expand. According to the stent system, after the stent is released, the stent can be shrunk again, and the stent can be positioned in the blood vessel again so as to be accurately released at the target position.

Description

Technical Field

[0001] This invention relates to the field of interventional medicine, and more specifically to a stent system. Background Technology

[0002] Aortic dissection, aortic ulcer, aortic aneurysm, etc. are a class of dangerous, rapidly progressing, and high-mortality vascular diseases. They are caused by localized lesions in the aortic wall, which continue to worsen under the continuous impact of blood flow, leading to catastrophic consequences.

[0003] Depending on the location and extent of the lesion, treatment options include surgery and endovascular intervention. Among these, endovascular intervention, with its minimally invasive nature, rapid recovery, and good efficacy, has become the preferred treatment option for lesions confined to the descending aorta. The endovascular stent is delivered to the lesion via a delivery system. The stent is then released and adheres to the vessel wall. The endovascular stent covers the lesion, preventing blood flow from reaching the lesion site and thus avoiding continuous impact from the blood flow, thereby achieving a therapeutic effect.

[0004] However, existing covered stent systems present the following problems during physician operation: During stent deployment, the physician first releases the distal end of the stent to initially anchor it within the blood vessel. This process requires accurate judgment of the stent's placement. If the intended location is not reached during deployment, endoleak or stent displacement may occur, potentially leading to complete stent failure. Furthermore, the shape of human blood vessels is complex, and patients' vascular conditions vary, thus demanding a high level of experience and expertise from the physician. If the stent's position needs to be readjusted to achieve the desired location, there is a risk of scratching the blood vessel due to the stent's adherence to the vessel wall after deployment. Summary of the Invention

[0005] To overcome the problems existing in the prior art, the present invention provides a support system.

[0006] The solution to the technical problem of this invention is to provide a stent system comprising a tubular stent, a conveyor, a first draw wire, and a second draw wire. The stent includes a coated stent and a bare stent. The bare stent is disposed on the distal side of the coated stent. One end of the first draw wire is connected to the proximal side of the conveyor, and the other end of the first draw wire passes through the conveyor, passes through the coated stent, extends along the circumferential direction of the bare stent, and is detachably connected to the bare stent. Movement of the first draw wire can cause the bare stent to contract or expand. One end of the second draw wire is connected to the proximal side of the conveyor, and the other end of the second draw wire passes through the conveyor, passes through the coated stent, extends along the distal circumferential direction of the coated stent, and is detachably connected to the coated stent. Movement of the second draw wire can cause a portion of the coated stent to contract or expand.

[0007] In some embodiments of the present invention, the conveyor includes a first wire adjustment assembly, which includes a main body and a movable part. The movable part is movable relative to the main body. One end of the first wire is fixed inside the main body, and the other end of the first wire extends along the circumferential direction of the bare support and enters the conveyor and connects with the movable part. The movement of the movable part can drive the first wire to move, thereby causing the bare support to contract or expand.

[0008] In some embodiments of the present invention, the support system further includes a support ring, and the conveyor further includes an inner sheath core. The proximal end of the inner sheath core is fixedly disposed inside the conveyor, and the support ring is sleeved on the distal end side of the inner sheath core. The support ring is provided with a first hole and a second hole that penetrate the two axially upward surfaces of the support ring at intervals. One end of the second pull wire is connected to the conveyor, and the other end of the second pull wire passes through the first hole, extends along the circumferential direction of the inner side of the distal end of the film-coated support, and enters the second hole.

[0009] In some embodiments of the present invention, the support system further includes a second release wire, the proximal end of which is connected to the conveyor, and the distal end of the second pull wire is provided with a second collar structure. The distal end of the second release wire passes through the second hole, and the second collar structure is detachably sleeved on the second release wire. The second release wire is movable relative to the inner sheath core, and after the second release wire moves towards its proximal end, it can separate from the second collar structure.

[0010] In some embodiments of the present invention, the film-coated support includes a narrow film structure, the narrow film structure being disposed along the inner circumferential direction of the film-coated support, the narrow film structure including a narrow film channel disposed along the circumferential direction of the narrow film structure, one end of the second draw wire passing through the first hole and then through the narrow film channel, extending along the narrow film channel, then exiting from the narrow film structure and entering the second hole.

[0011] In some embodiments of the present invention, the support ring includes a first support ring and a second support ring, the first support ring and the second support ring being spaced apart in the axial direction and the first support ring being disposed on the distal end side of the second support ring; one end of the second pull wire passes through the first hole of the second support ring and the first hole of the first support ring in sequence, and then spirally extends towards the proximal end along the circumferential direction of the inner side of the film-coated bracket and enters the second hole of the second support ring.

[0012] In some embodiments of the present invention, a first shrinkage line is provided on the inner or outer surface of the covered stent along the circumferential direction of the inner or outer surface of the covered stent. A first threading ring and a second threading ring are respectively provided at both ends of the first shrinkage line. One end of the second pull wire passes through the first threading ring and the second threading ring in sequence and extends towards the proximal end and is housed in the conveyor.

[0013] In some embodiments of the present invention, the covered stent further includes a second shrinkage wire and a third shrinkage wire. The second shrinkage wire and the third shrinkage wire are respectively provided with a first threading loop and a second threading loop at their two ends. The first shrinkage wire is provided near the proximal end, and the third shrinkage wire is provided near the distal end. The second shrinkage wire is provided between the first shrinkage wire and the third shrinkage wire. One end of the second pull wire passes through the first threading loop of the first shrinkage wire, the second shrinkage wire and the third shrinkage wire in sequence, and then passes through the second threading loop of the third shrinkage wire, the second shrinkage wire and the first shrinkage wire in sequence.

[0014] In some embodiments of the present invention, the first threading loop and the second threading loop of the shrinking thread are circumferentially spaced apart, and the distance between the first threading loop and the second threading loop of the first shrinking thread is a first distance, the distance between the first threading loop and the second threading loop of the second shrinking thread is a second distance, and the distance between the first threading loop and the second threading loop of the third shrinking thread is a third distance, wherein the first distance is smaller than the second distance, and the second distance is smaller than the third distance.

[0015] In some embodiments of the present invention, a top membrane structure is provided on the inner or outer surface of the covered support, the proximal end of the top membrane structure has an opening, the distal end of the top membrane structure is a closed end, the support system further includes a top rod, the proximal end of the top rod is housed in the conveyor, and the distal end of the top rod can enter the top membrane structure from the opening; the distal end of the top rod is provided with an adaptation structure.

[0016] Compared with the prior art, the stent system of the present invention has the following advantages: The stent system of the present invention includes a tubular stent, a delivery device, a first pull wire, and a second pull wire. The stent includes a bare stent and a covered stent. Operating the delivery device can drive the first pull wire and the second pull wire to move. The movement of the first pull wire can cause the bare stent to contract or expand, and the movement of the second pull wire can cause the covered stent to contract or expand. Thus, after the stent is released, it can re-contract, allowing the stent to be repositioned in the blood vessel and precisely released at the target location. Attached Figure Description Figure 1This is a schematic diagram of the support system structure provided in the first embodiment of the present invention.

[0017] Figure 2 This is a schematic diagram of the structure of the first draw wire binding bare bracket of the bracket system provided in the first embodiment of the present invention.

[0018] Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0019] Figure 4 This is a schematic diagram of the connection between the first draw wire and the bare bracket in the bracket system provided in the first embodiment of the present invention.

[0020] Figure 5 This is a schematic diagram of the support structure of the support system provided in the first embodiment of the present invention.

[0021] Figure 6 This is a schematic diagram of the structure of the inner sheath core, the mounting part, and the first release wire of the support system provided in another specific embodiment of the present invention.

[0022] Figure 7 yes Figure 6 Enlarged cross-sectional view of the structure at point B along the CC direction.

[0023] Figure 8 This is a schematic diagram of the structure of the first pull wire of the bracket system provided in the first embodiment of the present invention, in which the loop structure is sleeved on the first release wire.

[0024] Figure 9 This is a three-dimensional structural diagram of the support and inner sheath core of the support system provided in the first embodiment of the present invention.

[0025] Figure 10 yes Figure 9 Enlarged view of point D in the middle.

[0026] Figure 11 This is a three-dimensional structural diagram of the narrow membrane structure of the support system provided in the second embodiment of the present invention.

[0027] Figure 12 yes Figure 11 Enlarged view of point E in the middle.

[0028] Figure 13 This is a schematic diagram of the sheath core structure of the support system provided in the second embodiment of the present invention.

[0029] Figure 14 This is a perspective structural diagram of the bracket system provided in the third embodiment of the present invention, showing the cooperation between the bracket and the second draw wire.

[0030] Figure 15 yes Figure 14 Enlarged view of point F in the image.

[0031] Figure 16 This is a schematic diagram of the three-dimensional structure of the support system provided in the third embodiment of the present invention.

[0032] Figure 17 yes Figure 16 Enlarged view of point G in the image.

[0033] Figure 18 This is a three-dimensional structural diagram of the top rod of the support system provided in the third embodiment of the present invention.

[0034] Figure Identification: 100, Support System; 1, Support; 11, Film-coated Support; 110, First Wire Buckle; 111, Annular Corrugated Ring; 1111, First Corrugated Ring; 112, Film Coating; 113, End Corrugated Ring; 114, Second Wire Buckle; 115, Narrow Membrane Structure; 1151, Narrow Membrane Channel; 12, Bare Support; 121, Corrugated Peak; 122, Corrugated Valley; 123, Connecting Rod; 2, Conveyor; 21, First Wire Adjustment Assembly; 211, Main Body; 212, Moving Part; 22, Handle Body; 23, Inner Sheath Core; 231, Tip Head; 2311. Channel; 2312. First section; 2313. Second section; 2314. Support component; 2315. Arc-shaped surface; 2316. Plane; 2317. Storage part; 24. Sheath tube; 25. Mounting component; 251. Fixing part; 252. Protrusion; 2521. Through hole; 26. First release wire adjustment assembly; 261. Main body; 262. Fixing part; 3. First pull wire; 31. First collar structure; 4. First release wire; 5. Support ring; 51. First hole; 52. Second hole ; 6. Second pull wire; 61. Second loop structure; 7. Second release wire; 20. Outer sheath core; 201. U-shaped anchor; 53. First support ring; 54. Second support ring; 116. Shrink wire; 1161. First threading ring; 1162. Second threading ring; 1163. First shrink wire; 1164. Second shrink wire; 1165. Third shrink wire; 1166. First spacing; 1167. Second spacing; 1168. Third spacing; 117. Top membrane structure; 8. Top rod; 81. Adaptive structure. Detailed Implementation

[0035] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the invention and to fully convey the scope of the invention to those skilled in the art.

[0036] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0037] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0038] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented as "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0039] To more clearly describe the structure of this application, the terms "proximal" and "distal" are used herein as conventional terms in the field of interventional medicine. Specifically, "distal" refers to the end furthest from the operator during the surgical procedure, "proximal" refers to the end closest to the operator during the surgical procedure, "axial" refers to its length direction, and "radial" refers to the direction perpendicular to the "axial".

[0040] Please see Figure 1 and Figure 2 The first embodiment of the present invention provides a stent system 100, which includes a tubular stent 1 and a delivery device 2. The stent 1 is a self-expanding tubular structure, and the stent 1 is delivered to the lesion site through the delivery device 2. The stent 1 can self-expand and deploy within the blood vessel. The stent 1 includes a covered stent 11 and a bare stent 12, with the bare stent 12 disposed at the distal end of the covered stent 11. The bare stent 12 is used to improve the anchoring force of the stent 1, ensuring that the stent 1 is firmly anchored within the blood vessel. Once the bare stent 12 has deployed and anchored within the blood vessel, it becomes difficult to retrieve or adjust the position of the stent 1, and the risks involved in the operation are also greater. Therefore, in a specific embodiment of the present invention, the stent system 100 further includes a first pull wire 3. One end of the first pull wire 3 is connected to the delivery device 2, and the other end of the first pull wire 3 passes through the delivery device 2, passes through the covered stent 11, extends along the circumferential direction of the bare stent 12, and then passes through the covered stent 11 in the proximal direction to connect with the delivery device 2. Operating the delivery device 2 can drive the first pull wire 3 to move. The movement of the first pull wire 3 can drive the bare stent 12 to contract or expand, thereby allowing the bare stent 12 to recontract after release, so that the stent 1 can be repositioned in the blood vessel and accurately released at the target location.

[0041] Specifically, please combine Figure 4 and Figure 5In the first embodiment of the present invention, the bare support 12 has a sinusoidal structure, having multiple peaks 121, troughs 122, and connecting rods 123 connecting the peaks 121 and troughs 122. The troughs 122 are connected to the coated support 11, and the peaks 121 are positioned at their distal ends as free ends. One end of the first draw wire 3 is fixedly connected to the conveyor 2, and the other end, being a free end, passes through the conveyor 2, passes through the coated support 11, and then sequentially passes through the multiple peaks 121 around the circumference of the bare support 12, so that the first draw wire 3 is threaded onto the bare support 12. That is, the free end of the first pull wire 3 passes through the outer side of a crest 121 and enters the inner side of the bare stent 12. It then passes through the inner side of an adjacent crest 121 to the outer side of the bare stent 12, and so on, until the free end of the first pull wire 3 extends circumferentially along the bare stent 12 and passes through all the crests 121 in sequence, as shown in the figure. Subsequently, the free end of the first pull wire 3 passes through the covered stent 11 and enters the delivery device 2, where the doctor can manipulate the free end of the first pull wire 3. During use, if the stent 1 is found to be released inaccurately, the free end of the first pull wire 3 can be pulled proximally, causing the distal end of the bare stent 12 to contract towards the upward central axis of the stent 1, thus moving the bare stent 12 away from the inner wall of the blood vessel. At this point, the position of the stent 1 can be adjusted. After adjusting the position of the stent 1, due to the self-expanding characteristic of the bare stent 12, the free end of the first pull wire 3 can be directly released, and the bare stent 12 will self-expand and anchor itself in the blood vessel. After the stent 1 is released, the end of the first pull wire 3 that is fixedly connected to the delivery device 2 can be cut off, so that both ends of the first pull wire 3 are free ends. At this time, one end of the first pull wire 3 can be pulled at will to remove the first pull wire 3 from the body. In the first embodiment of the present invention, the free end of the first pull wire 3 passes through all the crests 121 in sequence along the circumference of the bare stent 12, and is set to complete one circle around the circumference of the bare stent 12. The above arrangement ensures that the first pull wire 3 can drive all the crests 121 of the bare stent 12 to contract, and also ensures that the bare stent 12 can contract more evenly and stably, while avoiding the situation where it is difficult to pull the first pull wire 3 due to too many turns around the circumference of the bare stent 12. Furthermore, to prevent the first draw wire 3 from getting stuck on the bare bracket 12 during movement, the material of the first draw wire 3 can be a polymer material such as carbon fiber, nylon, or PE. Simultaneously, a layer of polymer material can be applied to the wave crest 121 to reduce the friction between the wave crest 121 and the first draw wire 3, further preventing the first draw wire 3 from getting stuck on the bare bracket 12 during movement.

[0042] In other specific embodiments of the present invention, the first pull wire 3 may also spirally wind multiple times around the outer surface of the bare bracket 12 from the proximal end to the distal end before passing through the crest 121 in sequence. This allows the bare bracket 12 to be compressed and contracted as a whole when the first pull wire 3 is pulled, thereby shrinking the distal end of the bracket 1 to a smaller size before adjusting its position. The number of times the first pull wire 3 passes through the crest 121 can also be set according to actual needs, that is, the length of the first pull wire 3 extending along the circumference of the bare bracket 12 can be set. For example, the first pull wire 3 may pass through a portion of the crest 121 and be wound around the circumference of the bare bracket 12 for 3 / 4 turns. The bare bracket 12 may also have through holes for the first pull wire 3 to pass through. For example, when manufacturing the bare bracket 12, multiple through holes are cut on the bare bracket 12, and the first pull wire 3 can pass through multiple through holes in sequence and then connect to the bare bracket 12. Alternatively, multiple wire buckles made of wire can be tied to the bare bracket 12, and then the first pull wire 3 can be passed through the multiple wire buckles in sequence.

[0043] Please see Figures 1-3The conveyor 2 includes a first drawstring adjustment assembly 21 and a handle body 22. The first drawstring adjustment assembly 21 includes a main body 211 and a movable part 212. The main body 211 is connected to the handle body 22. The main body 211 can be a structure with a hollow cavity formed by extending outward from the side wall of the handle body 22; or it can be a single structure with a hollow cavity, connected to the handle body 22 by means of threaded connection, magnetic connection, snap-fit, etc. The movable part 212 can move relative to the main body 211. One end of the first drawstring 3 is fixed in the main body 211, and the other end (free end) of the first drawstring 3 passes through multiple crests 121 in sequence along the circumference of the bare support 12 and enters the handle body 22 of the conveyor 2, where it connects to the movable part 212. The movement of the movable part 212 drives the first drawstring 3 to move, thereby causing the bare support 12 to contract or expand. In the first embodiment of the present invention, the main body 211 and the handle body 22 are integrally formed, and the movable part 212 is connected to the main body 211 by a threaded connection. In the initial state (i.e., before the first pull wire adjustment assembly 21 is operated), the movable part 212 is connected to the main body 211, fixing the movable part 212 to the main body 211 to prevent the movable part 212 from shaking or moving. When it is necessary to retract the released bare stent 12, the movable part 212 is rotated to separate it from the main body 211, and then the movable part 212 is pulled towards the proximal end. The movement of the movable part 212 towards the proximal end causes the first pull wire 3 to move towards the proximal end, and the movement of the first pull wire 3 towards the proximal end causes the bare stent 12 to retract. When it is necessary to release the bare stent 12, simply release the movable part 212, and the bare stent 12 will unfold and adhere to the blood vessel wall after being no longer restrained by the first pull wire 3. When it is necessary to remove the first pull wire 3 from the body to the outside, separate the end of the first pull wire 3 that is fixedly connected to the main body 211, and then pull any end of the first pull wire 3 to remove the first pull wire 3 from the body to the outside.

[0044] Please see Figure 4 and Figure 5To prevent the first pull wire 3 from tangling with the bracket 1, at least one first wire buckle 110 is provided on the inner side of the coated bracket 11. The free end of the first pull wire 3 enters from the inner side of the proximal end of the coated bracket 11, passes through at least one first wire buckle 110 towards the distal end, exits from the inner side of the distal end of the coated bracket 11, passes through multiple crests 121 in sequence along the circumference of the bare bracket 12, passes through the first wire buckle 110 towards the proximal end, and exits from the proximal end of the coated bracket 11 into the conveyor 2, finally connecting with the movable member 212. The first wire buckle 110 can fix the position of the first pull wire 3 and guide it, preventing the first pull wire 3 from accumulating or shaking within the coated bracket 11, thereby preventing the first pull wire 3 from tangling with the coated bracket 11. In the first embodiment of the present invention, there are two first wire buckles 110, respectively located on the inner side of the coated bracket 11 near the proximal end and near the distal end. Depending on the specifications of the bracket 1, the spacing between the two first wire buckles 110 can be adaptively set, ranging from 2cm to 15cm. In other specific embodiments of the present invention, a passage extending along the axial direction of the coated bracket 11 can also be provided on the inner side of the coated bracket 11. The passage can be made of a coating material. For example, a liner can be provided on the inner side of the coated bracket 11, and a film can be attached to the liner and the inner side of the coated bracket 11 by coating. Then, the liner can be removed to form a passage made of coating material. The first pull wire 3 can pass through the passage and enter the bare bracket 12. A flexible tube extending along the axial direction of the coated bracket 11 can also be provided on the inner side of the coated bracket 11. The flexible tube can be fixed on the inner side of the coated bracket 11 by means of adhesive or other methods. The first pull wire 3 passes through the flexible tube and enters the bare bracket 12.

[0045] Please see Figure 4 , Figure 6 and Figure 7The conveyor 2 further includes an inner sheath core 23, the proximal end of which is fixedly disposed within the conveyor 2. A tip head 231, fixedly connected to the inner sheath core 23, is disposed on the distal end of the inner sheath core 23. A channel 2311 is disposed on the tip head 231, extending from its sidewall to its proximal end face; that is, the channel 2311 connects the sidewall and proximal end face of the tip head 231. The channel 2311 is axially spaced from the distal end of the bare support 12. One end of the first draw wire 3 passes sequentially through multiple crests 121 along the circumference of the bare support 12, enters the channel 2311 from the sidewall of the tip head 231, passes through the channel 2311, and exits from the proximal end of the tip head 231. Specifically, the channel 2311 is generally L-shaped. The axial spacing between the channel 2311 and the distal end of the bare bracket 12 means that there is a gap between the proximal end of the channel 2311 (i.e., the portion of the channel 2311 near the proximal face of the tip head 231) and the distal end of the bare bracket 12. Alternatively, there is a gap between the portion of the channel 2311 near the sidewall of the tip head 231 and the distal end of the bare bracket 12. First, the channel 2311 serves a guiding function, ensuring that after the first pull wire 3 wraps around the bare bracket 12 once upwards, it follows the guidance of the channel 2311 towards the proximal end. Second, the arrangement of the channel 2311 also standardizes the routing of the first pull wire 3, preventing accumulation or knotting, and also preventing unnecessary entanglement between the first pull wire 3 and the bare bracket 12, thus preventing the first pull wire 3 from moving. Furthermore, the aforementioned spacing design allows doctors to pull the first pull wire 3 with less effort. This means doctors can pull the first pull wire 3 with less force, thus preventing the support 1 from shifting due to excessive force.

[0046] Furthermore, the channel 2311 includes a first segment 2312 extending from the sidewall of the tip head 231 towards the axis of the tip head, and a second segment 2313 connected to the first segment 2312 and extending towards the proximal end. When the first pull wire 3 is pulled, the first pull wire 3 will exert force at the junction of the first segment 2312 and the second segment 2313. To prevent the tip head 231 from breaking or being damaged due to the force exerted by the first pull wire 3 at the junction of the first segment 2312 and the second segment 2313, a support member 2314 is embedded in the tip head 231. The support member 2314 includes a connected arcuate surface 2315 and a flat surface 2316. The arcuate surface 2315 is located near the distal end and is located within the first segment 2312. That is, a portion of the arc-shaped surface 2315 of the support member 2314 is embedded into the first segment 2312, and the flat surface 2316 corresponds to the second segment 2313. After the first pull wire 3 enters the first segment 2312, it follows the arc-shaped surface 2315 into the second segment 2313. When the first pull wire 3 is pulled, it contacts the arc-shaped surface 2315, and applies force to it. The arc-shaped surface 2315 acts as a fulcrum for the first pull wire 3, thus transitioning it from the first segment 2312 to the second segment 2313. Therefore, the support member 2314 prevents the first pull wire 3 from directly contacting the tip head 231, thereby avoiding damage to the tip head 231. The support member 2314 can be made of metal, such as stainless steel, or a metal material with developing function, such as tantalum. This allows the support member 2314 to not only support the tip head 231 and prevent it from being damaged, but also to perform a developing function. The support member 2314 can also be made of a high-hardness polymer material, etc. Furthermore, please combine Figures 1-5In the first embodiment of the present invention, the conveyor 2 further includes a sheath 24, and the inner sheath core 23 is disposed within the sheath 24. The sheath 24 is axially movable relative to the inner sheath core 23. The bracket 1 is sleeved on the inner sheath core 23 and loaded within the sheath 24. After the sheath 24 moves proximally to release the bracket 1, the first draw wire 3 is in a taut state to contract and bind the bare bracket 12. When it is necessary to release the bare bracket 12, one end of the first draw wire 3 moves distally to unfold and release the bare bracket 12. It should be noted that when the bracket 1 is released, the bare bracket 12 needs to be bound first to avoid the bare bracket 12 rubbing against the inner wall of the sheath 24, which would affect the release of the bracket 1. Therefore, after the bracket 1 is loaded into the sheath 24, the bare bracket 12 is in a taut and contracted state by the first draw wire 3. When the bare support 12 needs to be unfolded, the first pull wire 3 can be moved distally, thereby unfolding the bare support 12. Therefore, the first pull wire 3 also has a post-release function; that is, after the sheath 24 retracts to release the support 1, the bare support 12 portion of the support 1 is still bound by the first pull wire 3. When the bare support 12 needs to be released, the first pull wire 3 is moved distally again to release the bare support 12. The first pull wire 3 not only has the function of retracting the bare support 12 after release to reposition the support 1, but also takes into account the post-release function. This eliminates the need for the conveyor 2 to have an additional outer sheath core and a U-shaped anchor hooked to the bare support 12, reducing the cost and manufacturing difficulty of the conveyor 2, and simplifying the loading of the support 1 into the sheath 24. Meanwhile, since the delivery device 2 does not have an outer sheath core or a U-shaped anchor, the diameter of the sheath 24 can be made smaller, allowing the sheath 24 to enter smaller blood vessels and increasing the applicability of the stent system 100. It also makes the sheath 24 easier to advance within the blood vessel, allowing it to reach the target position more easily and facilitating the doctor's operation. It should be noted that since the first pull wire 3 needs to move distally to release the bare stent 12, and then pulls proximally when it is necessary to retract the bare stent 12, the movable member 212 can move distally relative to the main body 211 in the initial state to release the bare stent 12. For example, the movable member 212 is threadedly connected to the main body 211, and in the initial state, the movable member 212 can rotate distally relative to the main body 211, thereby driving the first pull wire 3 to move distally. When it is necessary to retract the bare support 12, the movable part 212 rotates relative to the main body 211 in the proximal direction, thereby driving the first pull wire 3 to move in the proximal direction to retract the bare support 12.

[0047] Please continue reading. Figures 6-8In other specific embodiments of the present invention, the conveyor 2 may further include a support member 25, which is disposed on the inner sheath core 23 near the tip head 231. The support member 25 includes a fixing part 251 fixed to the inner sheath core 23 and a protrusion 252 protruding from the outer surface of the fixing part 251. The protrusion 252 is provided with a through hole 2521 arranged in the axial direction, and the tip head 231 is provided with a receiving part 2317 near its proximal end. The support system 100 further includes a first release wire 4, the proximal end of which is connected to the conveyor 2, and the distal end of which passes through the through hole 2521 and is received in the receiving part 2317. The first release wire 4 is movable relative to the inner sheath core 23. Further, the proximal end of the first pull wire 3 is connected to the conveyor 2, and the distal end of the first pull wire 3 is provided with a first collar structure 31. The distal end of the first pull wire 3 passes sequentially through the crest 121 along the circumference of the bare bracket 12 and tightens to bind the bare bracket 12. The first collar structure 31 is sleeved on the first release wire 4. After the first release wire 4 moves towards its proximal end, it can separate from the first collar structure 31. Specifically, the first pull wire 3 has a first collar structure 31 on its distal end. That is, after the end of the first pull wire 3 with the first collar structure 31 passes through the bare bracket 12, the first collar structure 31 extends towards the position between the bracket 25 and the proximal end of the tip head 231. Subsequently, the distal end of the first release wire 4 passes sequentially through the through hole 2521, the first collar structure 31, and finally enters the receiving part 2317. Unlike the first embodiment, the proximal end of the first pull wire 3 is connected to the movable member 212, while the distal end of the first pull wire 3 cooperates with the first release wire 4 through the first collar structure 31 and does not extend towards its proximal end into the conveyor 2. In use, pulling the movable part 212, that is, pulling the proximal end of the first pull wire 3, causes the first pull wire 3 to move proximally. Because the first collar structure 31 engages with the first release wire 4, the distal end of the first pull wire 3 will hardly move. Therefore, the first pull wire 3, threaded on the bare stent 12, will contract, thereby causing the bare stent 12 to contract as well. When it is necessary to remove the first pull wire 3 from the body, first move the first release wire 4 proximally, causing the distal end of the first release wire 4 to separate from the first collar structure 31. At this time, the distal end of the first pull wire 3 will no longer be restricted by the first release wire 4. Then, pulling the proximal end of the first pull wire 3 will pull the entire first pull wire 3 out of the body. The design of the first release wire 4 reduces the stroke of the first pull wire 3, making it easier for the doctor to pull the first pull wire 3, and the feedback from the first pull wire 3 and the bare stent 12 will be more sensitive.At the same time, it can also reduce the risk of the first draw wire 3 becoming tangled due to its excessive length.

[0048] It should be noted that, please refer to... Figure 1 To secure the first release wire 4 and prevent it from prematurely separating from the first collar structure 31, a first release wire adjustment assembly 26 can be provided on the conveyor 2. The first release wire adjustment assembly 26 includes a main body 261 and a fixing part 262. The main body 261 is integrally formed with the handle body 22 of the conveyor 2, and the fixing part 262 is detachably connected to the main body 261. The proximal end of the first release wire 4 enters the main body 261. The proximal end of the first release wire 4 may or may not be connected to the fixing part 262. For example, when the first release wire 4 is not connected to the fixing part 262, the fixing part 262 is a screw structure, and the fixing part 262 is threadedly connected to the main body 261 from the side wall of the main body 261. In the initial state, the fixing part 262 enters the main body 261 and presses the proximal end of the first release wire 4, thereby securing the first release wire 4. Figure 1 As shown. When the first release wire 4 needs to move, the fixing part 262 is rotated so that the fixing part 262 moves away from the proximal end of the first release wire 4. After the first release wire 4 is no longer restricted by the fixing part 262, it can move. When the first release wire 4 is connected to the fixing part 262, the structure of the first pull wire adjustment assembly 21 can be referred to, and will not be described again here.

[0049] Further, please refer to Figure 9 and Figure 10The support system 100 further includes a support ring 5 and a second pull wire 6. The support ring 5 is sleeved on the inner sheath core 23. The support ring 5 has a first hole 51 and a second hole 52 spaced apart, penetrating both axially upward surfaces of the support ring 5. The distal end of the second pull wire 6 is provided with a second collar structure 61. The proximal end of the second pull wire 6 is connected to the conveyor 2. After passing through the first hole 51, the distal end of the second pull wire 6 extends circumferentially around the distal inner side of the covered support 11 and is housed within the second hole 52. The support system 100 also includes a second release wire 7. The proximal end of the second release wire 7 is connected to the conveyor 2. The distal end of the second release wire 7 passes through the second hole 52, and the second collar structure 61 is sleeved on the second release wire 7 and housed within the second hole 52. The second release wire 7 is movable relative to the inner sheath core 23. After moving proximally, the second release wire 7 can separate from the second collar structure 61. Specifically, since the second collar structure 61 is fitted onto the second release wire 7, and the second collar is housed within the second hole 52, the second collar structure 61 is constrained by the inner wall of the second hole 52 and the second release wire 7. Therefore, when the second pull wire 6 is pulled proximally, the distal end of the second pull wire 6 (i.e., one end of the second collar structure 61) hardly moves, and the portion of the second pull wire 6 surrounding the inner side of the covered support 11 contracts, thereby causing the portion of the covered support 11 in contact with the second pull wire 6 to contract. When it is necessary to release the covered support 11 again, simply release the second pull wire 6, and the covered support 11 will expand again. When it is necessary to remove the second pull wire 6 from the body, the second release wire 7 can be moved proximally first, causing the second release wire 7 to separate from the second collar structure 61. At this point, the second pull wire 6 is no longer restricted by the second release wire 7. Then, pull the second pull wire 6 towards the proximal end, and the second collar structure 61 will be withdrawn from the second hole 52, then from the membrane support 11, and finally withdrawn out of the body.

[0050] It should be noted that the support ring 5 serves a supporting function here, meaning the support point of the second pull wire 6 rests on the support ring 5. When the second pull wire 6 moves towards the proximal end, since the support ring 5 is providing support, the movement of the second pull wire 6 will not cause the bracket 1 to move towards the proximal end. This avoids the movement of the second pull wire 6 affecting the position of the bracket 1, and thus avoids the bracket 1 moving and affecting the accuracy of its release. To ensure the contraction effect of the second pull wire 6 on the coated bracket 11, the distal end of the second pull wire 6 is wound around the inner circumference of the coated bracket 11, and the second loop structure 61 is fitted onto the second release wire 7 and housed in the second hole 52. This allows the second pull wire 6 to drive the coated bracket 11 to contract more evenly, smoothly, and completely. Meanwhile, since the second pull wire 6 wraps around the inner circumference of the film-coated bracket 11, the first hole 51 and the second hole 52 need to be positioned as close as possible so that the second pull wire 6 can wrap around the inner circumference of the film-coated bracket 11 exactly once. To further reduce the impact of the movement of the second pull wire 6 on the bracket 1, the support ring 5 is correspondingly positioned on the circular plane formed after the second pull wire 6 wraps around the inner side of the film-coated bracket 11. That is, after the second pull wire 6 wraps around the inner side of the film-coated bracket 11, the second pull wire 6 forms a circular plane, and the support ring 5 is correspondingly positioned on or close to this circular plane. In this way, when the second pull wire 6 is pulled, the axial force of the second pull wire 6 on the film-coated bracket 11 can be avoided as much as possible, thereby further reducing the impact of the movement of the second pull wire 6 on the bracket 1. In the first embodiment of the present invention, the distance between the support ring 5 and the circular plane formed by the second pull wire 6 is 0mm-10mm. Within the above range, the second pull wire 6 can be kept away from axial force acting on the film-coated bracket 11 as much as possible. Further, in the first embodiment of the present invention, the distal end of the second release wire 7 extends distally after passing through the support ring 5, such that the distance between the distal end of the second release wire 7 and the distal end face of the support ring 5 is 2mm-10mm. Through the above arrangement, the second pull wire 6 is prevented from detaching from the second release wire 7 during the process of moving proximally to retract the film-coated support 11. Simultaneously, it ensures that the second release wire 7 provides sufficient support, preventing the second pull wire 6 from deforming the second release wire 7 during pulling. Furthermore, to ensure that the second collar structure 61 does not easily separate from the second release wire 7, the second collar structure 61 may not be housed within the second hole 52; it can simply be fitted onto the second release wire 7. In other specific embodiments of the present invention, to ensure that the second collar structure 61 does not easily separate from the second release wire 7, a resistance-increasing structure (not shown) may also be provided within the second hole 52. The friction-increasing structure can be a threaded structure provided on the inner wall of the second hole 52, or it can be multiple protrusions protruding from the inner wall of the second hole 52, thereby increasing the friction between the second collar structure 61 and the inner wall of the second hole 52, ensuring that the second collar structure 61 will not easily slip out of the second hole 52, and thus ensuring that the second collar structure 61 will not easily separate from the second release wire 7. Alternatively, the diameter of the second hole 52 can be set to gradually decrease from the proximal end to the distal end, so that when the second collar structure 61 disengages from the second hole 52, it must pass through the smaller diameter portion of the distal end of the second hole 52. The smaller diameter portion will increase the contact area between the second collar structure 61 and the second hole 52, thereby increasing the friction between the second collar structure 61 and the second hole 52, ensuring that the second collar structure 61 will not easily slip out of the second hole 52, and thus ensuring that the second collar structure 61 will not easily separate from the second release wire 7.

[0051] It should be noted that the second pull wire 6 can be connected to a second pull wire adjusting assembly (not shown) provided on the conveyor 2. In use, the second pull wire 6 is moved by operating the second pull wire adjusting assembly. The second release wire 7 can be connected to a second release wire adjusting assembly (not shown) provided on the conveyor 2. In use, the second release wire 7 is moved by operating the second release wire adjusting assembly. The structures of the second pull wire adjusting assembly and the second release wire adjusting assembly can be referenced from the first pull wire adjusting assembly 21 and the first release wire adjusting assembly 26, and will not be described again here.

[0052] It should be noted that, please combine this with... Figure 8When adjusting the position of the stent 1, the first pull wire 3 and the second pull wire 6 can be pulled, causing the bare stent 12 and the covered stent 11 to contract together. This further ensures that the stent 1 does not adhere to the blood vessel wall after contraction, guaranteeing smooth position adjustment of the stent 1. After the first pull wire 3 and the second pull wire 6 move proximally, since the contracted portions of the bare stent 12 and the covered stent 11 are relatively close, the contraction of the bare stent 12 and the covered stent 11 will cause their contracted portions to contract in tandem. This allows the stent 1 to contract to a smaller diameter, and the contraction process of the bare stent 12 and the covered stent 11 will be more effortless. Alternatively, the first pull wire 3 can be pulled first, causing the bare stent 12 to contract first, and then the second pull wire 6 can be pulled, causing the covered stent 11 to contract. This avoids the bare stent 12 from tilting outwards after the covered stent 11 contracts first.

[0053] Please continue reading. Figure 9 and Figure 10 The covered stent 11 includes multiple annular wave coils 111, a covering 112, and end wave coils 113. The multiple annular wave coils 111 are coaxially spaced, and the covering 112 is disposed on the multiple annular wave coils 111. The end wave coils 113 are disposed at the distal end of the stent 1, and the end wave coils 113 are disposed inside the covering 112, while the multiple annular wave coils 111 are disposed outside the covering 112. Both the end wave coils 113 and the annular wave coils 111 are formed by wavy lines in the shape of a sine wave. The period and amplitude of the end wave coils 113 are smaller than those of the annular wave coils 111, giving the end wave coils 113 better support. At the same time, the end wave coils 113 are disposed inside the covering 112, which can improve the adhesion of the covering 112 to the blood vessel wall and improve the sealing performance of the stent 1. The annular wave loop 111 is disposed on the outer side of the covering membrane 112, thereby facilitating the suturing of the annular wave loop 111 to the covering membrane 112. It also increases the friction between the stent 1 and the blood vessel wall, ensuring that the stent 1 is firmly anchored within the blood vessel. The covering membrane 112 is made of PET polyester fabric, and the annular wave loop 111 and the end wave loop 113 are sutured to the covering membrane 112.

[0054] The annular wavering 111 includes a first wavering 1111 located axially adjacent to the end wavering 113 and near the proximal end of the end wavering 113. A plurality of second thread loops 114 are provided on the inner side of the covering film 112 corresponding to the first wavering 1111. These second thread loops 114 are spaced apart circumferentially. The distal end of the second pull wire 6 passes through the plurality of second thread loops 114 sequentially and wraps around the inner circumferential side of the covering film 112. The plurality of second thread loops 114 are located on the inner side of the covering film 112 corresponding to the midpoint of the axial direction of the first wavering 1111. After passing through the plurality of second thread loops 114 sequentially, the second pull wire 6 forms a circular plane. The second thread loop 114 can be a metal ring sewn onto the inner side of the covering film 112, or it can be a medical suture formed into a loop by sewing. The second thread loops 114 are used to wrap the distal end of the second pull wire 6 around the inner side of the covering film 112. Simultaneously, multiple second thread clips 114 are positioned on the inner side of the covering 112 corresponding to the midpoint of the first wave coil 1111's axial direction. This ensures that the first wave coil 1111 can contract uniformly, preventing it from tilting relative to the central axis of the stent 1 during contraction. Furthermore, the contraction of the first wave coil 1111 can cause the end wave coil 113 and the adjacent annular wave coil 111 to contract as well, ensuring that more of the stent 1 participates in the contraction. This prevents the stent 1 from adhering to the blood vessel wall after contraction, allowing for smooth positional adjustment of the stent 1.

[0055] In other specific embodiments of the present invention, the length of the second draw wire 6 extending on the inner side of the film-coating bracket 11 can be adaptively set according to actual needs. That is, the distal end of the second draw wire 6 passes through multiple second wire loops 114 in sequence and wraps around the inner side of the film-coating bracket 11 once, and then continues to pass through multiple second wire loops 114 in sequence to wrap around the inner side of the film-coating bracket 11 more than once. For example, the distal end of the second draw wire 6 can pass through multiple second wire loops 114 twice in sequence and then wrap around the inner side of the film-coating bracket 11 twice. The positions of the first hole 51 and the second hole 52 can also be adjusted according to actual needs. For example, the first hole 51 and the second hole 52 can be arranged opposite each other. The second wire loop 114 can also be replaced by a through hole on the first corrugated coil 1111, that is, multiple through holes are provided on the first corrugated coil 1111, and the second draw wire 6 passes through multiple through holes in sequence and then wraps around the inner circumferential side of the film 112 once.

[0056] Please combine Figures 9-11In other specific embodiments of the present invention, a narrow membrane structure 115 may be used instead of the second thread buckle 114. The narrow membrane structure 115 is arranged along the circumferential direction of the inner side of the film-coated support 11. The narrow membrane structure 115 includes a narrow membrane channel 1151 arranged along the circumferential direction of the narrow membrane structure 115. One end of the second pull wire 6 passes through the first hole 51 and then enters the narrow membrane channel 1151, extends along the narrow membrane channel 1151, and then exits from the narrow membrane structure 115 and enters the second hole 52. Specifically, the narrow membrane structure 115 may be made of PTFE or PET and is arranged on the inner side of the film-coated support 11 by adhesive bonding or by sewing with sutures. There may be only one narrow membrane structure 115. When there is only one narrow membrane structure 115, the narrow membrane structure 115 is a continuous long strip structure. The number of narrow membrane structures 115 can also be multiple, with multiple narrow membrane structures 115 spaced apart along the inner circumferential direction of the covering bracket 11. One end of the second pull wire 6 passes sequentially through the narrow membrane channels 1151 of the multiple narrow membrane structures 115 and then enters the second hole 52. Further, the narrow membrane channels 1151 can be fixed with sutures to enhance the strength of the narrow membrane channels 1151 and the overall strength of the narrow membrane structures 115. For example, the narrow membrane channel 115 is formed by protruding from the circumferential central axis of the narrow membrane structure 115 towards the inner side of the covering bracket 11, and then sutured along the circumferential trajectory of the narrow membrane channel 1151. Figure 12As shown. This further reinforces the narrow membrane channel 1151 and the narrow membrane structure 115, preventing the second pull wire 6 from tearing the narrow membrane channel 1151 when contracting the covered support 11, and preventing the second pull wire 6 from pulling the narrow membrane structure 115 off the covered support 11. It should be noted that a coating can also be provided inside the narrow membrane channel 1151 to reduce the friction between the narrow membrane structure 115 and the second pull wire 6, ensuring that the second pull wire 6 can move smoothly within the narrow membrane channel 1151, thereby ensuring that the movement of the second pull wire 6 can smoothly contract the covered support 11. It also reduces the force required to pull the second pull wire 6, facilitating the doctor's operation. The narrow membrane structure 115 ensures that when the second pull wire 6 moves proximally and contracts, it will cause the narrow membrane structure 115 to contract together, and the contraction of the narrow membrane structure 115 will in turn cause the covered support 11 to contract. The narrow membrane structure 115 has a relatively large contact area with the coating support 11, thus allowing for more uniform contraction of the coating support 11 and enabling a larger portion of the coating support 11 to contract. Simultaneously, the size of the narrow membrane channel 1151 can be set to be similar to that of the second draw wire 6; for example, if the diameter of the second draw wire 6 is 1mm, the diameter of the narrow membrane channel 1151 is 1.5mm. This avoids problems such as the second draw wire 6 swaying or accumulating within the narrow membrane channel 1151, ensuring that the movement of the second draw wire 6 promptly drives the coating support 11 to contract, preventing any misalignment of the second draw wire 6. Meanwhile, the narrow membrane channel 1151 limits the movement trajectory of the second draw wire 6. That is, the second draw wire 6 in the narrow membrane channel 1151 always contracts along the narrow membrane channel 1151 and will not move axially relative to the narrow membrane channel 1151. This ensures the contraction effect of the second draw wire 6 and avoids the inability to drive the film-coated support 11 to contract circumferentially due to the axial movement of the second draw wire 6.

[0057] Please combine Figure 1 , Figure 9 and Figure 13The second embodiment of the present invention provides a stent system. The stent system of the second embodiment is structurally similar to the stent system 100 of the first embodiment. The main difference is that the conveyor 2 of the stent system of the second embodiment further includes an outer sheath core 20, which is sleeved on the inner sheath core 23, and the outer sheath core 20 can move axially relative to the inner sheath core 23. The support ring 5 is sleeved on the outer sheath core 20, and a U-shaped anchor 201 is provided at the distal end of the outer sheath core 20. The U-shaped anchor 201 is used to hook the crest 121 of the bare stent 12. In the initial state, the stent 1 is sleeved on the outer sheath core 20 and loaded in the sheath tube 24, and the crest 121 of the bare stent 12 is hooked on the U-shaped anchor 201. When the sheath tube 24 moves proximally to release the stent 1, the bare stent 12 will not unfold and release because it is hooked on the U-shaped anchor 201. When it is necessary to release the bare support 12, the outer sheath core 20 is moved proximally, causing the U-shaped anchor 201 to separate from the bare support 12. The U-shaped anchor 201 then no longer restricts or restrains the bare support 12, allowing it to unfold and be released. In the second embodiment of the invention, the outer sheath core 20 and the U-shaped anchor 201 serve to release the bare support 12, providing a more stable restraint effect.

[0058] It should be noted that since the outer sheath core 20 and the U-shaped anchor 201 serve to release the bare bracket 12, the first pull wire 3 does not need to be in a state of tension and contraction of the bare bracket 12 in the initial state; the first pull wire 3 can be in a relatively loose state. Therefore, during the release of the first bare bracket 12, the first pull wire 3 does not need to move towards the distal end first and then towards the proximal end. Correspondingly, the structure of the first pull wire adjustment assembly 21 does not need to be designed so that the movable part 212 can move towards the distal end relative to the main body 211 first and then towards the proximal end, thereby simplifying the operation and structure. At the same time, since the support ring 5 is disposed on the outer sheath core 20, when the outer sheath core 20 moves towards the proximal end to release the bare bracket 12, it will drive the support ring 5 to move towards the proximal end, and the movement of the support ring 5 towards the proximal end may drive the second pull wire 6 to move towards the proximal end. Therefore, a certain amount of the second pull wire 6 can be provided between the support ring 5 and the second wire buckle 114. That is, the second pull wire 6 between the support ring 5 and the second wire buckle 114 is not taut, but rather loose. This means that even if the support ring 5 moves towards the proximal end and causes the second pull wire 6 to move towards the proximal end, it will only pull the loose second pull wire 6 between the support ring 5 and the second wire buckle 114 into a relatively straight state, without causing the film-coated bracket 11 to contract or causing the bracket 1 to move together.

[0059] Please see Figure 14 and Figure 15The third embodiment of the present invention provides a support system, which differs from the support system of the first embodiment mainly in that: the support ring 5 includes a first support ring 53 and a second support ring 54, the first support ring 53 and the second support ring 54 are spaced apart axially, and the first support ring 53 is located on the distal end of the second support ring 54. One end of the second pull wire 6 passes through the first hole 51 of the second support ring 54 and the first hole 51 of the first support ring 53 in sequence, and then spirals along the circumferential direction of the inner side of the covered support 11 towards the proximal end and enters the second hole 52 of the second support ring 54. After passing through the second hole 52, one end of the second pull wire 6 can extend along the proximal end until it is connected to the second pull wire adjustment assembly. At this time, the second loop structure 61 of the second pull wire 6, the second release wire 7, and the second release wire adjustment assembly can be omitted. Alternatively, a second loop structure 61 can be provided at one end of the second pull wire 6. The end of the second pull wire 6 with the second loop structure 61 passes through the second hole 52 and is then housed within the second hole 52 of the second support ring 54. The second release wire 7 passes through the second hole 52 of the second support ring 54, and the second loop structure 61 is fitted onto the second release wire 7. In use, pulling one end of the second pull wire 6 causes the side of the second pull wire 6 passing through the first hole 51 to move first, thereby causing the distal portion of the second pull wire 6 spirally extending circumferentially inside the film-coated bracket 11 to contract first, thus driving the distal end of the film-coated bracket 11 to contract. As the second pull wire 6 moves, the film-coated bracket 11 will gradually contract along the spiral trajectory of the second pull wire 6 until the portion of the film-coated bracket 11 corresponding to the spiral extension of the second pull wire 6 is completely contracted.

[0060] Through the above-described design, firstly, more of the covered stent 11 can contract, making it easier to adjust its position after contraction and reducing the risk of damage to the blood vessel wall during adjustment. Secondly, the contraction process of the covered stent 11 is gradual, allowing doctors to select the amount of contraction based on the specific situation. For example, when less contraction is needed, the covered stent 11 can contract along half of the spiral trajectory of the second pull wire 6. This makes the stent system more adaptable to different conditions and blood vessel shapes. Furthermore, the second pull wire 6 is passed distally through the second support ring 54 and the first support ring 53, and then spirally extended proximally on the inner side of the covered stent 11, ensuring that the distal end of the covered stent 11 contracts first during contraction. This allows the bare stent 12 and the covered stent 11 to contract in tandem, enabling the stent 1 to shrink to a smaller diameter, and making the contraction process of the bare stent 12 and the covered stent 11 less strenuous. Simultaneously, the distal end of the covered stent 11 contracting first prevents it from piling up during contraction. For example, if the contraction of the covered stent 11 occurs gradually from the proximal end to the distal end during the contraction of the bare stent 12, the contracted portion of the covered stent 11 will move towards the bare stent 12 due to the relatively fixed position after contraction. This causes the contracted portions of the covered stent 11 to move closer together and accumulate, affecting the overall contraction of the stent 1. Furthermore, the first support ring 53 and the second support ring 54 provide support; that is, the support points of the second draw wire 6 after spiral extension will fall on the first support ring 53 and the second support ring 54, respectively. When the second pull wire 6 moves towards the proximal end, the first support ring 53 and the second support ring 54 provide support, so the movement of the second pull wire 6 will not cause the bracket 1 to move towards the proximal end. This avoids the movement of the second pull wire 6 affecting the position of the bracket 1, and thus avoids the bracket 1 moving and affecting the accuracy of its release.

[0061] It should be noted that a spirally extending narrow membrane structure (not shown) can be provided on the inner side of the film-coated support 11. The narrow membrane structure includes a narrow membrane channel (not shown) arranged along the spiral trajectory of the narrow membrane structure. The second pull wire 6 passes through the narrow membrane channel to reduce the resistance encountered by the second pull wire 6 when it moves, reduce the force required to pull the second pull wire 6, ensure that the second pull wire 6 can move smoothly, and thus ensure that the film-coated support 11 can retract smoothly. Please see Figure 16 The fourth embodiment of the present invention provides a stent system, which differs from the stent system of the first embodiment in that: a shrinkage line 116 is provided on the inner or outer surface of the covered stent 11 along the circumferential direction of the inner or outer surface of the covered stent 11. A first threading loop 1161 and a second threading loop 1162 are respectively provided at both ends of the shrinkage line 116. One end of the second pull wire 6 passes through the first threading loop 1161 and the second threading loop 1162 in sequence and extends proximally before being housed in the conveyor 2. In one embodiment of the present invention, the shrinkage line 116 is provided on the outer surface of the covered stent 11. After the shrinkage line 116 extends along the circumferential direction of the covered stent 11, the two ends of the shrinkage line 116 are spaced apart from each other, and the first threading loop 1161 and the second threading loop 1162 are also spaced apart from each other. One end of the second pull wire 6 passes through the first threading ring 1161 from the proximal end to the distal end, then passes through the second threading ring 1162 from the distal end to the proximal end, and then extends towards the proximal end and is housed within the conveyor 2. That is, both ends of the second pull wire 6 are housed within the conveyor 2. In use, both ends of the second pull wire 6 are pulled simultaneously, causing the second pull wire 6 to move towards the proximal end as a whole. The movement of the second pull wire 6 towards the proximal end brings the first threading ring 1161 and the second threading ring 1162 closer together, thereby causing the shrink line 116 to tighten around the film-coated support 11, achieving the effect of shrinking the film-coated support 11. Furthermore, a narrow membrane structure (not shown) can be provided on the outer surface of the coated support 11. The shrinkage line 116 is housed within the narrow membrane channel of the narrow membrane structure, and the dimensions of the first threading ring 1161 and the second threading ring 1162 are larger than the dimensions of the narrow membrane channel, while the first threading ring 1161 and the second threading ring 1162 are exposed outside the narrow membrane structure. The narrow membrane structure serves to fix the shrinkage line 116. Simultaneously, the narrow membrane structure has a smooth surface, thereby ensuring minimal friction between the narrow membrane structure and the shrinkage line 116, ensuring smooth shrinkage of the shrinkage line 116. The narrow membrane channel restricts the axial movement of the shrinkage line 116, ensuring that the shrinkage line 116 always shrinks along the narrow membrane channel, thus ensuring the uniformity and effectiveness of the shrinkage of the coated support 11. The first threading loop 1161 and the second threading loop 1162 are always exposed outside the narrow membrane structure, ensuring that the second draw wire 6 can pass through the first threading loop 1161 and the second threading loop 1162 relatively easily.

[0062] In other embodiments of the present invention, the narrow membrane structure may be omitted, and the contraction line 116 may be fixed by a wire buckle. In this case, fine fiber villi (not shown) may be provided on the contraction line 116. These fine fiber villi can effectively fill the gap between the covered stent 11 and the blood vessel wall, allowing the covered stent 11 to better conform to the blood vessel wall. Simultaneously, blood can adhere to the fine fiber villi, thereby promoting thrombosis and further filling the gap between the covered stent 11 and the blood vessel wall, preventing endoleak of the stent 1. In other embodiments of the present invention, the contraction line 116 may also be disposed on the inner side of the covered stent 11.

[0063] Further, please refer to Figure 16 and Figure 17The shrinking line 116 may further include a first shrinking line 1163, a second shrinking line 1164, and a third shrinking line 1165. The first shrinking line 1163 is disposed near the proximal end, the third shrinking line 1165 is disposed near the distal end, and the second shrinking line 1164 is disposed between the first shrinking line 1163 and the third shrinking line 1165. One end of the second draw wire 6 passes sequentially through the first threading loop 1161 of the first shrinking line 1163, the second shrinking line 1164, and the third shrinking line 1165, and then sequentially through the second threading loop 1162 of the third shrinking line 1165, the second shrinking line 1164, and the first shrinking line 1163, before extending proximally and being housed within the conveyor 2. Furthermore, the first threading loop 1161 and the second threading loop 1162 of the shrinking line 116 are arranged at intervals, and the distance between the first threading loop 1161 and the second threading loop 1162 of the first shrinking line 1163 is a first distance 1166, the distance between the first threading loop 1161 and the second threading loop 1162 of the second shrinking line 1164 is a second distance 1167, and the distance between the first threading loop 1161 and the second threading loop 1162 of the third shrinking line 1165 is a third distance 1168. The first distance 1166 is smaller than the second distance 1167, and the second distance 1167 is smaller than the third distance 1168. With the above configuration, the second pull wire 6 passes sequentially through the first threading loop 1161 of the first shrinking wire 1163, the second shrinking wire 1164, and the third shrinking wire 1165, and then sequentially through the second threading loop 1162 of the third shrinking wire 1165, the second shrinking wire 1164, and the first shrinking wire 1163. The portion of the second pull wire 6 passing through the first threading loop 1161 and the second threading loop 1162 has a teardrop-shaped structure. When the second pull wire 6 is pulled, since the third spacing 1168 is at the farthest end and has the largest length, the third shrinking wire 1165 will shrink first. After pulling the second pull wire 6 a certain distance, the third spacing 1168 will decrease to the same length as the second spacing 1167. Continuing to pull the second pull wire 6 at this point will cause the third shrinking wire 1165 and the second shrinking wire 1164 to shrink. The third spacing 1168 and the second spacing 1167 will be reduced to the same length as the first spacing 1166. At this time, if the second pull wire 6 is pulled, the first shrinking wire 1163 will shrink. This causes the first shrinking wire 1163, the second shrinking wire 1164, and the third shrinking wire 1165 to shrink in a stepped manner.

[0064] It should be noted that the lengths of the first spacing 1166, the second spacing 1167, and the third spacing 1168 need to be gradually increased. This is because if the lengths of the first spacing 1166, the second spacing 1167, and the third spacing 1168 are the same, the second pull wire 6 passing through the three first threading loops 1161 will be in a straight line, and the second pull wire 6 passing through the three second threading loops 1162 will also be in a straight line, making it difficult to drive the second shrinking wire 1164 and the first shrinking wire 1163 to shrink. With the above arrangement, firstly, more of the coating bracket 11 can shrink, thus allowing more of the bracket 1 to shrink, facilitating the positional adjustment of the bracket 1. Secondly, while ensuring that more of the coating bracket 11 can shrink, the arrangement of the first spacing 1166, the second spacing 1167, and the third spacing 1168 makes pulling the second pull wire 6 smoother and requires less force.

[0065] Please see Figures 16-18 The covered stent 11 has a top membrane structure 117 on its inner or outer surface. The proximal end of the top membrane structure 117 has an opening, and the distal end of the top membrane structure 117 is closed. The stent system also includes a push rod 8. The proximal end of the push rod 8 is housed within the delivery device 2, and the distal end of the push rod 8 enters the top membrane structure 117 through the opening. The distal end of the push rod 8 is provided with an adaptation structure 81. By having the distal end of the push rod 8 abut against the top membrane structure 117, it is ensured that the stent 1 will not move proximally when it contracts, thus ensuring the positional accuracy of the stent 1 throughout the surgical procedure. Simultaneously, since the stent 1 is in a compressed state when not deployed, and when the stent 1 is deployed, its expansion will cause the push rod 8 to bend. Therefore, to accommodate this bending deformation, the push rod 8 is provided with the adaptation structure 81 at the position corresponding to the proximal end of the stent 1, and the push rod 8 will bend at the position of the adaptation structure 81. Specifically, the adaptive structure 81 can be an elastic, wave-shaped structure, such as... Figure 18 As shown. When the adaptive structure 81 undergoes bending deformation, its wavy structure will be stretched to a relatively straight state. This allows the adaptive structure 81 to adapt to the bending deformation, preventing the top rod 8 from retracting due to bending deformation. This avoids the situation where the top rod 8 cannot continuously support itself within the top membrane structure 17 after bending deformation, thus ensuring that the top rod 8 can always support itself within the top membrane structure 17, thereby preventing the support 1 from retracting.

[0066] Compared with the prior art, the stent of the present invention has the following advantages: The stent system of the present invention includes a tubular stent, a delivery device, a first pull wire, and a second pull wire. The stent includes a bare stent and a covered stent. Operating the delivery device can drive the first pull wire and the second pull wire to move. The movement of the first pull wire can drive the bare stent to contract or expand, and the movement of the second pull wire can drive the covered stent to contract or expand. Thus, after the stent is released, it can re-contract, allowing the stent to be repositioned in the blood vessel and precisely released at the target location.

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A support system, characterized in that: The support system includes a tubular support, a conveyor, a first pull wire, and a second pull wire. The support includes a coated support and a bare support. The bare support is disposed on the distal side of the coated support. One end of the first pull wire is connected to the proximal side of the conveyor, and the other end of the first pull wire passes through the conveyor, passes through the coated support, extends along the circumferential direction of the bare support, and is detachably connected to the bare support. Movement of the first pull wire can cause the bare support to contract or expand. One end of the second pull wire is connected to the proximal side of the conveyor, and the other end of the second pull wire passes through the conveyor, passes through the coated support, extends along the distal circumferential direction of the coated support, and is detachably connected to the coated support. Movement of the second pull wire can cause part of the coated support to contract or expand.

2. The support system as described in claim 1, characterized in that: The conveyor includes a first wire adjustment assembly, which includes a main body and a movable part. The movable part is movable relative to the main body. One end of the first wire is fixed inside the main body, and the other end of the first wire extends along the circumferential direction of the bare support and enters the conveyor and connects with the movable part. The movement of the movable part can drive the first wire to move, thereby causing the bare support to contract or expand.

3. The support system as described in claim 1, characterized in that: The support system further includes a support ring, and the conveyor further includes an inner sheath core. The proximal end of the inner sheath core is fixedly disposed inside the conveyor, and the support ring is sleeved on the distal end side of the inner sheath core. The support ring is provided with a first hole and a second hole that penetrate the two axial surfaces of the support ring at intervals. One end of the second pull wire is connected to the conveyor, and the other end of the second pull wire passes through the first hole, extends along the circumferential direction of the inner side of the distal end of the film-coated support, and enters the second hole.

4. The support system as described in claim 3, characterized in that: The support system also includes a second release wire, the proximal end of which is connected to the conveyor, and the distal end of the second pull wire is provided with a second collar structure. The distal end of the second release wire passes through the second hole, and the second collar structure is detachably sleeved on the second release wire. The second release wire can move relative to the inner sheath core, and after moving towards the proximal end, the second release wire can separate from the second collar structure.

5. The support system as described in claim 3, characterized in that: The film-coated support includes a narrow film structure, which is arranged along the inner circumferential direction of the film-coated support. The narrow film structure includes a narrow film channel arranged along the circumferential direction of the narrow film structure. One end of the second draw wire passes through the first hole and then enters the narrow film channel, extends along the narrow film channel, and then exits from the narrow film structure and enters the second hole.

6. The support system as described in claim 3, characterized in that: The support ring includes a first support ring and a second support ring, which are spaced apart axially and the first support ring is located at the distal end of the second support ring. One end of the second pull wire passes through the first hole of the second support ring and the first hole of the first support ring in sequence, and then spirals along the circumferential direction of the inner side of the film-coated bracket towards the proximal end and enters the second hole of the second support ring.

7. The support system as described in claim 1, characterized in that: A first shrinkage line is provided on the inner or outer surface of the film-coated support along the circumferential direction of the inner or outer surface of the film-coated support. A first threading ring and a second threading ring are respectively provided at both ends of the first shrinkage line. One end of the second pull wire passes through the first threading ring and the second threading ring in sequence, extends towards the proximal end, and is stored in the conveyor.

8. The support system as described in claim 7, characterized in that: The covered support also includes a second shrinkage wire and a third shrinkage wire. The second shrinkage wire and the third shrinkage wire are respectively provided with a first threading loop and a second threading loop at their two ends. The first shrinkage wire is located near the proximal end, and the third shrinkage wire is located near the distal end. The second shrinkage wire is located between the first shrinkage wire and the third shrinkage wire. One end of the second pull wire passes through the first threading loop of the first shrinkage wire, the second shrinkage wire and the third shrinkage wire in sequence, and then passes through the second threading loop of the third shrinkage wire, the second shrinkage wire and the first shrinkage wire in sequence.

9. The support system as described in claim 8, characterized in that: The first threading loop and the second threading loop of the shrinking thread are circumferentially spaced apart, and the distance between the first threading loop and the second threading loop of the first shrinking thread is a first distance, the distance between the first threading loop and the second threading loop of the second shrinking thread is a second distance, and the distance between the first threading loop and the second threading loop of the third shrinking thread is a third distance. The first distance is smaller than the second distance, and the second distance is smaller than the third distance.

10. The support system as claimed in claim 7, characterized in that: A top membrane structure is provided on the inner or outer surface of the covered support. The proximal end of the top membrane structure has an opening, and the distal end of the top membrane structure is a closed end. The support system also includes a top rod. The proximal end of the top rod is housed in the conveyor, and the distal end of the top rod can enter the top membrane structure through the opening. The distal end of the top rod is provided with an adaptation structure.

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