Stent system

Abstract

Provided is a stent system (100), comprising a first stent (1) and a second stent (2) that each have a tubular main body. The first stent (1) and the second stent (2) each comprise a support framework (4) and a surface coating (3). A distal side of the first stent (1) comprises a distal connection section (11), a proximal side of the second stent (2) comprises a proximal connection section (21), an inner surface of the distal connection section (11) is provided with a hooking member (12), and an outer surface of the proximal connection section (21) is provided with a hanging member (22). The proximal connection section (21) can be inserted into the distal connection section (11) to be connected to the first stent (1). After connection, the hooking member (12) is connected to the hanging member (22), thereby enabling the second stent (2) to be connected to the first stent (1). Providing the hooking member (12) of an internal barb structure and the hanging member (22) having both sealing and connection functions can ensure that the first stent (1) and the second stent (2) are stably connected after docking, and also can reduce the risk of the internal barb structure penetrating through the surface coating (3), thereby further enhancing the sealing performance of the connection position after docking.

Description

support system Technical Field

[0001] This invention relates to the field of medical device technology, and more particularly to a stent system. Background Technology

[0002] Today, stents are widely used in endovascular repair of various aortic aneurysms, especially for the treatment of abdominal aortic aneurysms involving the common iliac artery. However, existing covered stent systems still have several technical problems in their design and use, affecting the efficacy of the surgery and the long-term stability of the stent.

[0003] Existing stent systems are prone to poor connection when used together, especially due to imperfect stent structures, leading to a higher risk of endoleak. Insufficient stent bonding may cause stent dislodgement within the blood vessel, thus affecting surgical outcomes. Furthermore, the complex design of existing stents makes precise assembly difficult during manufacturing, resulting in low production efficiency, challenging quality control, and impacting product consistency and stability. Summary of the Invention

[0004] Therefore, it is necessary to provide a new support system that can at least solve the structural problems of inter-support fit and form a more modular and easy-to-assemble support system.

[0005] A stent system includes a first stent and a second stent, each having a tubular body. The first stent has a distal connecting section at its distal end, and the second stent has a proximal connecting section at its proximal end. The inner surface of the distal connecting section is provided with a hook, and the outer surface of the proximal connecting section is provided with a hanging member. The proximal connecting section can be inserted into the distal connecting section and connected to the first stent. After connection, the hook connects to the hanging member, thereby connecting the second stent to the first stent.

[0006] In one embodiment, the hook includes a fixed end and a free end, the fixed end being fixedly connected to the distal connecting segment, the free end being separated from the inner surface of the distal connecting segment and extending within the lumen of the distal connecting segment toward the proximal end of the first support.

[0007] In one embodiment, a plurality of hooks are provided, and the plurality of hooks are spaced apart circumferentially and / or axially along the distal connecting segment.

[0008] In one embodiment, the attached component includes a hanging portion disposed circumferentially along the proximal connecting segment, the hanging portion including a sealing connector at least partially located outside the proximal connecting segment and separated from the outer surface of the proximal connecting segment.

[0009] In one embodiment, the proximal connecting section includes a plurality of support wave rings spaced apart axially, with a gap between two adjacent support wave rings, and the hanging part is disposed within the gap.

[0010] In one embodiment, the attached component includes a first attached portion disposed circumferentially along the proximal connecting segment.

[0011] In one embodiment, the attached component includes a second attached portion, which is disposed circumferentially along the proximal connecting segment and located on the proximal side of the first attached portion on the proximal connecting segment.

[0012] In one embodiment, the attached component includes a third attached portion, which is disposed circumferentially along the proximal connecting segment and located on the proximal connecting segment at the distal end of the first attached portion.

[0013] In one embodiment, the first hanging part includes a first sealing connector, the second hanging part includes a second sealing connector, and the third hanging part includes a third sealing connector, wherein the wire diameters of the first sealing connector and the second sealing connector are both greater than the wire diameter of the third sealing connector.

[0014] In one embodiment, the wire density of the third sealing connector is greater than that of the first sealing connector and the second sealing connector.

[0015] In one embodiment, the first sealing connector and / or the second sealing connector includes a seal and a connector, wherein the wire diameter of the connector is greater than or equal to the wire diameter of the seal.

[0016] In one embodiment, the proximal side of the first bracket includes the proximal connecting segment, the proximal connecting segment including the hanging member, and the distal side of the second bracket includes the distal connecting segment, the distal connecting segment including the hook member.

[0017] The beneficial effects of this application are that it provides a support system, including a first support and a second support. The distal end of the first support includes a distal connecting section, and the proximal end of the second support includes a proximal connecting section. The inner surface of the distal connecting section is provided with a hook, and the outer surface of the proximal connecting section is provided with a hung part. The second support is connected to the first support by inserting the proximal connecting part into the distal connecting section. After connection, the hook and the hung part are connected and restrict the movement of the second support relative to the first support in the distal direction. The hook with an inner barb structure and the hung part, which has both sealing and connecting functions, can ensure a stable connection between the two supports after docking, and at the same time reduce the risk of the barb piercing the coating on the support surface, thereby further enhancing the sealing of the connection position after docking. Attached Figure Description

[0018] Figure 1 is a schematic diagram of the overall structure of the support system in Embodiment 1 of the present invention;

[0019] Figure 2 is a partially enlarged schematic diagram of position A in Figure 1 of this invention;

[0020] Figure 3 is a schematic diagram of the first support structure in Embodiment 1 of the present invention;

[0021] Figure 4 is a partially enlarged schematic diagram of position B in Figure 3 of this invention;

[0022] Figure 5 is a cross-sectional schematic diagram of two hooks arranged circumferentially in Embodiment 1 of the present invention;

[0023] Figure 6 is a cross-sectional schematic diagram of four hooks arranged circumferentially in Embodiment 1 of the present invention;

[0024] Figure 7 is a partial schematic diagram of a hook and hanger having multiple proximal connecting sections along the axial direction in one embodiment of the present invention;

[0025] Figure 8 is a schematic diagram showing that the free end of the hook is provided with a branch in another embodiment of the present invention;

[0026] Figure 9 is a schematic diagram of a teardrop-shaped structure at the free end of the hook in another embodiment of the present invention.

[0027] Figure 10 is a schematic diagram of a rectangular structure at the free end of the hook in another embodiment of the present invention.

[0028] Figure 11 is a schematic diagram of the second support structure in Embodiment 1 and Embodiment 2 of the present invention;

[0029] Figure 12 is a schematic diagram of the proximal connection section structure of the second stent in Embodiment 2 of the present invention;

[0030] Figure 13 is a schematic diagram of the polygonal grid structure formed by the interlacing sealing connectors in Embodiment 2 of the present invention;

[0031] Figure 14 is a schematic diagram of the interlaced diamond-shaped grid structure formed by the sealing connectors in Embodiment 2 of the present invention;

[0032] Figure 15 is a schematic diagram of the triangular grid structure formed by the interlacing sealing connectors in Embodiment 2 of the present invention;

[0033] Figure 16 is a schematic diagram of the separation structure between the sealing connector and the surface coating in Embodiment 2 of the present invention;

[0034] Figure 17 is a schematic diagram of the independently configured sealing element and connecting element in Embodiment 2 of the present invention;

[0035] Figure 18 is a schematic diagram of the structure of the sealing element winding connector in another embodiment of the second embodiment of the present invention;

[0036] Figure 19 is a structural schematic diagram of the hanging part in Embodiment 3 of the present invention when only the first hanging part is provided;

[0037] Figure 20 is a schematic diagram of the structure of the hanging part when the first hanging part and the second hanging part are provided in one embodiment of the present invention;

[0038] Figure 21 is a structural schematic diagram of the hanging part when the hanging part is provided with a first hanging part, a second hanging part and a third hanging part in another embodiment of the present invention;

[0039] Figure 22 is a schematic diagram of the structure of the second stent in Embodiment 4 of the present invention when the second stent is an iliac artery embedded branch stent and the distal end includes a hook;

[0040] Figure 23 is a schematic diagram of the embedded branch support structure in Embodiment 4 of the present invention. Detailed Implementation

[0041] To better understand the concept of this application, the implementation methods of this application will be described in detail below with reference to the accompanying drawings. The following specific embodiments are only some embodiments of this application and are not intended to limit this application.

[0042] 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.

[0043] 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.

[0044] To more clearly describe the structure of this application, the terms "proximal" and "distal" are used here as conventional terms in the field of interventional medicine. Specifically, "distal" refers to the end of the blood vessel furthest from the heart, and "proximal" refers to the end of the blood vessel closest to the heart; "axial" refers to its length direction, and "radial" refers to the direction perpendicular to the "axial" direction; "upper end" and "lower end" refer to two relatively distant ends, and when one end is defined as "upper end", the other distant end is "lower end".

[0045] Example 1:

[0046] When treating aneurysms in the human aorta, the aneurysm may extend to cover multiple different segments of the blood vessel. Therefore, when repairing aortic vessels in similar situations, it is often necessary to connect multiple different stents inside the blood vessel to form a system that covers all the areas of the blood vessel that need to be treated.

[0047] In this embodiment, referring to Figures 1-3, a stent system 100 is provided. The stent system 100 includes two first stents 1 and second stents 2 that are connected within a human blood vessel. The first stents 1 and second stents 2 typically have a tubular structure and include a supporting framework 4 and a surface coating 3. The surface coating 3 can be a PET material coating or a PTFE material coating. In this embodiment, to seek better long-term vascular patency and flexibility of the first stents 1 and second stents 2, the surface coating 3 of the first stents 1 and second stents 2 is a PTFE coating. The first stents 1 and second stents 2 are typically connected by interlocking.

[0048] Specifically, please refer to Figures 1 and 2. The distal end of the first support 1 includes a distal connecting section 11, and the proximal end of the second support 2 includes a proximal connecting section 21. The inner surface of the distal connecting section 11 is provided with a hook 12, and the outer surface of the proximal connecting section 21 is provided with a hanging part 22. The hook 12 can be a protrusion or a barb protruding from the inner surface of the first support 1, and the hanging part 22 can be a filamentous or flocculent material formed on the outer surface of the first support 1. Thus, when the hook 12 and the hanging part 22 are pressed together and axial relative displacement occurs, they hook and restrict each other. Therefore, when the second support 2 is connected to the first support 1 by inserting the proximal connecting part into the distal connecting section 11, the hook 12 and the hanging part 22 are connected after connection and restrict the second support 2 from moving in the distal direction relative to the first support 1. Here, when the first stent 1 and the second stent 2 are implanted into the human blood vessel, the first stent 1 is usually first delivered to the target location of the human blood vessel. After the first stent 1 is released, the second stent 2 is guided and delivered into the human blood vessel through another guidewire. It enters the first stent 1 from the proximal side and exits from the distal side. Before the second stent 2 is released, the second stent 2 is positioned so that at least the proximal connecting segment 21 is located at the position where it overlaps with the distal connecting segment 11 of the first stent 1. After release, the proximal connecting segment 21 of the second stent 2 is anchored to the distal connecting segment 11 of the first stent 1. At this time, the hook 12 hooks the attached part 22. Thus, during the subsequent long-term blood flushing, since the blood flow direction is from the first stent 1 to the second stent 2, the second stent 2 tends to move away from the first stent 1 under the flushing of blood flow. The hook 12 hooks the attached part 22, thereby preventing the second stent 2 from falling out of the first stent 1, thereby enhancing the mutual connection and anchoring effect between the first stent 1 and the second stent 2.

[0049] In this embodiment, the hanging part 22 is provided so that the hook 12 can be hooked and anchored to the second bracket 2 through the hanging part 22. This avoids the need for the hook 12 to be directly inserted into and hooked onto the surface film 3 of the second bracket 2, thereby avoiding the problem of internal leakage of the second bracket 2 caused by the hook 12.

[0050] In this embodiment, please refer to Figures 3 and 4. In order to better hook the hook 12 onto the object 22, the hook 12 includes a fixed end 121 and a free end 122. The fixed end 121 is used to fixally connect to the inner surface of the distal connecting section 11. The free end 122 is separated from the inner surface of the distal connecting section 11 and extends in the lumen of the distal connecting section 11 toward the proximal end of the first support 1. Specifically, the distal connecting section 11 of the first support 1 is usually provided with a metal support frame 4 and a surface coating 3. The fixed end 121 of the hook 12 can be fixedly connected to the support frame 4 by means of steel sleeve connection or winding. After connection, the free end 122 is inclined toward the inner cavity of the first support 1 and extends toward the proximal end of the first support 1 to form a barb structure toward the proximal end of the first support 1. With this configuration, when the hook 12 is connected to the object 22, the hook 12 can restrict the movement of the object 22 toward the distal end, thereby restricting the movement of the second support 2. Furthermore, the free end 122 of the hook 12 can be set as a ball head structure 1221, thereby preventing the sharp hook 12 from piercing the surface film 3 of the second support 2, while also preventing scratching the outer sheath of the inserted conveyor and preventing it from hooking with the inserted guide wire.

[0051] In this embodiment, referring to Figures 5 and 6, multiple hooks 12 can be provided. These hooks 12 can be spaced apart along the circumferential direction of the first support 1, specifically symmetrically arranged circumferentially or centrally. This arrangement ensures stability after connection when multiple hooks 12 are hooked to the device being hung. The symmetrical arrangement along the circumferential direction ensures even distribution of the connection positions, resulting in uniform force distribution at each position when the first support 1 and the second support 2 are anchored together, preventing uneven force distribution that could cause the second support 2 to shift to one side under the flushing effect of blood. Simultaneously, the symmetrical arrangement ensures that when the first support 1 is compressed into the outer sheath of the delivery device, the hooks 12 are evenly distributed radially after compression, preventing uneven distribution from causing excessive compression volume on one side of the support, affecting the sheathing and bending performance of the support after sheathing. For example, two hooks 12 can be provided symmetrically along the circumferential direction of the first support 1, or four hooks 12 can be provided centrally symmetrically along the circumferential direction of the first support 1.

[0052] In one embodiment, referring to Figure 7, multiple hooks 12 can also be provided in the axial direction. Multiple hooks 12 can be arranged at intervals along the circumferential and axial directions of the first bracket 1. Specifically, they can be arranged symmetrically in the circumferential direction. Here, while multiple hooks 12 are arranged in the circumferential direction, multiple sets are arranged at intervals in the axial direction. This can further increase the anchoring points of multiple hooks 12 on the second bracket 2, thereby enhancing the stability after anchoring. At the same time, multiple hooks 12 are arranged in the axial direction. If one hook 12 fails in the axial direction, the other hooks 12 in the axial direction can continue to play a role, thereby ensuring the hooking hit rate between the hooks 12 and the hooked part 22 of the second bracket 2.

[0053] In another embodiment, please refer to Figures 8-10. The free end 122 of the hook 12 may be provided with multiple branches 1222, such as two branches 1222 extending in different directions. The arrangement of the two branches 1222 can make the anchoring stability of the hook 12 at the anchoring position higher. Furthermore, the ball head structure 1221 of the free end 122 may be set as a teardrop-shaped structure 1223, a rectangular structure 1224, or other irregular structures.

[0054] Example 2:

[0055] In this embodiment, please refer to Figures 1, 11 and 12. The structure of the first support 1 and the second support 2 of the support system 100 is generally the same as that in Embodiment 1. The difference is that, in order to ensure that the hanging part 22 and the hook part 12 of the proximal connecting section 21 of the second support 2 can achieve better hook connection and anchoring, the hanging part 22 includes a hanging portion 220. The hanging portion 220 is arranged circumferentially along the proximal connecting section 21, and can be arranged continuously along the circumferential direction. It is easy to match the hook parts 12 arranged at intervals in the circumferential direction, so as to achieve uniform hooking. Specifically, the hanging part 220 includes a sealing connector 221, wherein the sealing connector 221 is at least partially located on the outside of the proximal connecting section 21, and the sealing connector 221 is at least partially separated from the outer surface of the proximal connecting section 21. Here, the sealing hook 12 has two functions: one is to provide a connection position other than the surface coating 3 for the hook 12 to hook, and the other is to provide fluffy filaments or flocculents, which can block and absorb the flowing blood when internal leakage occurs, thereby promoting the formation of a thrombus at the location, thereby sealing the location of internal leakage and preventing further internal leakage. Referring to Figure 16, the sealing connector 221 includes a fixed portion 2212 and a free portion 2211. The sealing connector 221 is fixedly connected to the surface coating 3 or the connecting ring 222 on the outer surface of the second support 2 or directly to the support frame 4 through the fixed portion 2212. The free portion 2211 is separated from the outer surface of the proximal connecting section 21, thereby promoting the formation of a fluffy structure, which is beneficial for the hooking of the hook 12 and the blocking of blood.

[0056] In this embodiment, please refer to Figures 11 and 12. Furthermore, in order to better hook the sealing connector 221 with the hook 12 while avoiding excessive increase in the compression volume when the proximal connecting section 21 of the second bracket 2 is compressed into the outer sheath, the proximal connecting section 21 includes a plurality of support corrugations 41 spaced apart axially. There is a gap H between two adjacent support corrugations 41, and the hooked part 220 is disposed in the gap H. Here, the support corrugations 41 of the second bracket 2 can be spaced apart to form corrugation supports. There is a gap between two adjacent support corrugations 41. The gap is covered only by a film and has no support corrugations 41. It is usually a position with good flexibility and compressibility. At the same time, the volume that can be reduced when the second bracket 2 is radially compressed is smaller than the volume of the position with support corrugations 41. Therefore, the sealing connector 221 is placed here. When the second bracket 2 is radially compressed, the surface film 3 at the gap position shrinks and leaves a certain space for the sealing connector 221 to be compressed, so as not to increase the radial volume of the second bracket 2 after compression. Meanwhile, between two adjacent support wave rings 41, the trough 411 of the support wave ring 41 on the proximal side faces the gap, and the crest 412 of the support wave ring 41 on the distal side faces the gap. The apex of the curved structure of the crest 412 and the trough 411 is well-suited as the setting position of the connecting ring 222 or the connection position of the fixing part 2212 of the sealing connector 221. After the fixing part 2212 is connected to the crest 412 and the trough 411, the curved structure makes it difficult for it to shift under pulling, thereby ensuring the stability of the position of the sealing connector 221 after connection and the overall structural stability. It can be understood that connecting the sealing connector 221 directly to the crest 412 and the trough 411 through the connecting ring 222 or the fixing part 2212 of the sealing connector 221 can prevent the connecting ring 222 or the sealing connector 221 from directly tearing the surface coating 3 due to the pulling of the hook 12 under the scouring force of blood flow.

[0057] In this embodiment, specifically referring to Figures 13-15, the sealing connector 221 is a wire structure, which can be made of PTFE polymer wire. It repeatedly weaves between the crests 412 and troughs 411 of adjacent support coils 41, forming an interlaced wire structure within the gap. This increases the number of hooking points for the hook 12, thereby ensuring stable hooking. The interlaced wire structure can form a rhomboid mesh structure 202, a triangular mesh structure 203, a polygonal mesh structure 201, or an irregularly shaped interlaced structure. Here, the winding density can be increased by increasing the number of turns of the sealing connector 221 around the gap, thereby increasing the stability of the hook 12.

[0058] In this embodiment, please continue to refer to Figure 12. When the sealing connector 221 is connected to the crest 412 and trough 411 through the connecting ring 222, if the connecting ring 222 is connected to the crest 412 and trough 411 by stitching, a stitched connection gap will be left at the surface coating 3 of the PTFE material, which will cause blood leakage in the long-term use. Therefore, in this embodiment, during the processing of forming the connecting ring 222 at the crest 412 and trough 411, after the inner surface coating 3 of the surface coating 3 of the second bracket 2 is applied to the inner surface of the support frame 4, the connecting ring 222 is first pre-embedded at the crest 412 and trough 411. After pre-embedding, an outer surface coating is formed on the outer surface of the second bracket 2. After forming, a complete and continuous surface coating 3 is formed. At the same time, the connection between the connecting ring 222 and the crest 412 and trough 411 does not need to be connected by stitching, thus avoiding the generation of stitched connection gaps.

[0059] In this embodiment, further referring to Figures 16 and 17, the sealing connector 221 may include a seal 2214 and a connector 2213. The purpose of setting the seal 2214 and the connector 2213 is that the connector 2213 is used to achieve the main hook connection with the hook 12, while the seal 2214 is used to block blood passing through the location when blood leakage occurs, absorb it and promote the formation of a thrombus. Here, the wire diameter of the connector 2213 can be set to be equal to the wire diameter of the seal 2214. In this way, the wire diameters of the connector 2213 and the seal 2214 should be set to avoid excessively increasing the volume of the second support 2 after compression.

[0060] In other embodiments, referring to Figure 17, the wire diameter D1 of the connector 2213 can be set to be larger than the wire diameter D2 of the seal 2214. The purpose of this setting is to make the connector 2213 the main component that hooks onto the hook 12, while the seal 2214 mainly serves to block blood pressure and absorb blood. It can be understood that the hook connection between the connector 2213 and the hook 12 requires stability. Therefore, the larger the wire diameter D1 of the connector 2213, the lower the possibility of breakage and deformation, and the better the stability after connection. On the other hand, the seal 2214 needs to cover a large area and absorb blood to block blood. Therefore, it is set to have a smaller wire diameter D2. Increasing the coverage area can better form a velvety interceptor, thereby improving the blood blocking rate and absorption rate. Therefore, using two wires with different diameters in combination can ensure a stable connection while avoiding an excessive increase in the radial dimension of the second bracket 2 after compression. It can also avoid the risk of the hook 12 breaking under stress after being hooked by simply setting the seal 2214 with too small a wire diameter, and can also avoid the problem of increasing the radial dimension of the second bracket 2 after compression caused by simply setting the connector 2213 with too large a wire diameter.

[0061] In one embodiment, referring to Figure 17, the connector 2213 and the seal 2214 can be set independently, and each includes a fixed portion 2212 connected to the second support 2 and a free portion 2211 separated from the surface of the second support 2. With this configuration, the seal 2214 can surround the connector 2213 in its natural state, so that after the hook 12 is connected to the connector 2213, the seal 2214 can block and seal blood at other separated positions.

[0062] In another embodiment, referring to Figure 18, multiple seals 2214 can be connected to a single connector 2213 as the main axis. Before being connected to the second bracket 2, the seals 2214 are spirally wound onto the surface of the connector 2213, thereby integrating the connector 2213 and the seals 2214 before connection to form a sealing connecting thread. The integrated design of the sealing connecting thread reduces the complexity of the process when connecting the connector 2213 and the seals 2214 to the second bracket 2, making it easier to connect to the outer surface of the second bracket 2. The arrangement of the sealing thread around the connecting thread increases the probability that the hook 12 will hook onto the connector 2213, greatly reducing the risk of the hook 12 breaking when hooked onto the seal 2214.

[0063] Example 3:

[0064] In this embodiment, referring to Figures 19-21, the structure of the first support 1 and the second support 2 of the support system 100 is largely the same as in Embodiments 1 and 2. The difference is that the hanging member 22 can have only one hanging part continuously arranged in the circumferential direction, or it can have multiple hanging parts. Specifically, referring to Figure 19, when only one hanging part is provided, the hanging member 22 includes only one first hanging part 2201. The first hanging part 2201 is arranged in the circumferential direction along the proximal connecting section 21. Here, the first hanging part 2201 includes a first sealing connector 22011. The first sealing connector 22011 may include a first connector 220111 and a first seal 220112. The wire diameter D3 of the first connector 220111 is greater than or equal to that of the first seal 22011. Since the wire diameter D4 of part 2 is only provided in one loop of the first hooked portion 2201, the first connecting member 220111 can be provided with a larger diameter D3, and the wire diameter of the first sealing member 220112 can be aligned with that of the first connecting member 220111. In this way, the first sealing member 220112 can also have sufficient strength to perform the same function as the first connecting member 220111 for the hook member 12 to hook on without being easily broken, and at the same time, it can also block blood to prevent leakage. Here, when only the first hooked portion 2201 is provided, the first hooked portion 2201 can not only be provided in the gap, but can also have more axial width, extending to the support corrugations 41 on both sides of the gap, so as to increase the area that the hook member 12 can hook and anchor, and ensure hooking.

[0065] In one embodiment, referring to Figure 20, the hooked component 22 can be provided with multiple hooked portions, for example, two hooked portions spaced apart along the axial direction. Specifically, the two hooked portions include a first hooked portion 2201 and a second hooked portion 2202, respectively. The first hooked portion 2201 and the second hooked portion 2202 are respectively located in two gaps on the proximal connecting section 21, and are both continuously arranged along the circumference of the proximal connecting section 21. The second hooked portion 2202 is located on the proximal side of the first hooked portion 2201 on the proximal connecting section 21. Thus, the first hooked portion 2201 serves as the preset primary hooking position when the second bracket 2 is released, and the second hooked portion 2202... 202 is the spare hook position for the first hooked part 2201. It is understandable that after the second stent 2 is released, the hook 12 may not be able to accurately fall within the area covered by the first hooked part 2201. Therefore, if the hook 12 fails to hook onto the first hooked part 2201 as expected, it can still hook onto the second hooked part 2202 when the second stent 2 moves distally due to blood flow to prevent the second stent 2 from detaching from the first stent 1 in the long term. Furthermore, in this embodiment, the second hooked portion 2202 includes a second sealing connector 22021. The second sealing connector 22021 may include a second connector 220211 and a second sealing member 220212. The second connector 220211 may be like the first connector 220111, and the wire diameter D5 may be set to be greater than or equal to the wire diameter D6 of the second sealing member 220212. Here, the second hooked portion 2202 serves as a spare hooking position. The first connector 220111 may be set to have a wire diameter greater than that of the first sealing member 220112, thereby reducing the volume occupied by the first sealing member 220112 and enhancing its sealing effect. Similarly, the second connector 220211 may also be set to have a wire diameter D5 greater than that of the second sealing member 220212, thereby reducing the volume occupied by the second sealing member 220212 and enhancing its sealing effect. It is understandable that the second connector 220211 can also be set with a larger diameter, and the wire diameter of the second seal 220212 can be aligned and equal with that of the second connector 220211. In this way, the second seal 220212 can also have sufficient strength to play the same role as the first connector 220111 for the hook 12 to hook and is not easy to break. When the first hooked part 2201 is not hooked by the hook 12, both the second connector 220211 and the second seal 220212 can provide a stable hook connection, thereby further ensuring the hook probability of the hook 12 when entering the second hooked part 2202, and also playing the role of blocking blood to prevent blood leakage.

[0066] In another embodiment, referring to Figure 21, the hanging component 22 can be provided with multiple hanging parts, for example, three hanging parts spaced apart along the axial direction. Specifically, the three hanging parts include a first hanging part 2201, a second hanging part 2202, and a third hanging part 2203. The first hanging part 2201, the second hanging part 2202, and the third hanging part 2203 are respectively located in three gaps on the proximal connecting section 21, and are all continuously arranged along the circumference of the proximal connecting section 21. The second hanging part 2202 is located on the proximal side of the first hanging part 2201 on the proximal connecting section 21, and the third hanging part 2203 is located on the distal side of the first hanging part 2201 on the proximal connecting section 21. Here, the main purpose of providing the third hanging part 2203 is to provide a final sealing effect at the joint of the first bracket 1 and the second bracket 2 after the first bracket 1 is connected, thereby achieving maximum sealing. To prevent blood leakage, it can be understood that since the first hooked part 2201 and the second hooked part 2202 need to bear the hooking function of the hooked part 12, the overall wire diameter of the first sealing connector 22011 of the first hooked part 2201 and the overall wire diameter of the second hooked part 2202 can be set to be larger than the wire diameter of the third sealing connector 22031 of the third hooked part 2203. This minimizes the radial volume of the three hooked parts after compression by the second bracket 2. While the third sealing connector 22031 has a small wire diameter, it can also have a larger range and higher density of wires than the first sealing connector 22011 and the second sealing connector 22021 to form a sufficiently dense blood interception net for better blood blocking effect. Furthermore, the third sealing connector 22031 can consist only of the third sealing element 220311. The third sealing element 220311 mainly provides a sealing effect, so it can have a smaller wire diameter but a higher density to form a denser blood interception structure. Meanwhile, since the third hanging part 2203 can be provided with only the third sealing element 220311, the third sealing element 220311 does not need to provide the function of being hooked by the hooked part 12, and does not need to bear the tension of the hooked part 12. Therefore, it can be directly applied to the coating surface in the gap without being connected to the adjacent support wave 41.

[0067] In another embodiment, when the hanging member 22 is provided with multiple hanging parts 220 and multiple hooks 12 are provided along the axial direction, the spacing between the axially distributed hooks 12 should be set to be equal to the axial spacing between the multiple hanging parts 220. This arrangement enables the multiple hooks 12 and the multiple hanging parts 220 in the axial direction to be hooked and connected. Specifically, for example, the hanging member 22 includes a first hanging part 2201, a second hanging part 2202 and a third hanging part 2203, and at least two hooks 12 are provided in the axial direction. Then, if the alignment is accurate, the two hooks 12 in the axial direction can be hung on the first hanging part 2201 and the second hanging part 2202 respectively, so as to further enhance the stability of the first bracket 1 and the second bracket 2 after anchoring.

[0068] Example 4:

[0069] In this embodiment, please refer to Figures 22 and 23. The structure of the first stent 1 and the second stent 2 of the stent system 100 is largely the same as that in Embodiments 1 to 3. The difference is that the structure of the stent system 100 provided in this application is applicable to various types of stents. Stents that are implanted in the human body and require connection at both ends can all be used with the structure of the stent system 100 provided in this application. For example, in this embodiment, the first stent 1 is an abdominal main bifurcation covered stent 10 or an abdominal main single-branch covered stent, and the second stent 2 is an iliac artery extension stent or an iliac artery inlay branch stent 20. Here, when the first stent 1 is an abdominal main bifurcation covered stent 10, the hook 12 can be set at the distal connecting segment 11 of the two bifurcation stents. When the first stent 1 is an abdominal main single-branch covered stent, the hook 12 can be set at the distal connecting segment 11 of the single branch. When the second stent 2 is an iliac artery extension stent or an iliac artery inlay branch stent 20, the hanging part can be set at the proximal connecting segment 21 on the outer surface of the iliac artery extension stent or the iliac artery inlay branch stent 20, so that the iliac artery extension stent or the iliac artery inlay branch stent 20 can establish a stable connection with the abdominal main bifurcation covered stent 10 or the abdominal main single branch covered stent.

[0070] In one embodiment, the first stent 1 may require connection to other stents at both its proximal and distal ends, and the second stent 2 may also require connection to other stents at both its proximal and distal ends. Therefore, the proximal side of the first stent 1 may include a proximal connecting segment 21, which includes a hook 22, and the distal side of the second stent 2 may include a distal connecting segment 11, which includes a hook 12. In this way, both the first stent 1 and the second stent 2 can be inserted into other stents at their proximal ends while simultaneously connecting other stents at their distal ends, thereby achieving modular combination of various stents and increasing the adaptability of the stent system 100 to different blood vessel types. Specifically, for example, the first stent 1 is an abdominal main bifurcation covered stent 10, and the second stent 2 is an iliac artery embedded branch stent 20. The distal side of the second stent 2 also needs to be connected to the internal and external iliac artery stents. Therefore, the proximal and distal sides of the iliac artery embedded branch stent 20 can be provided with a proximal connecting segment 21 and a distal connecting segment 11, respectively. A hanging member 22 is provided on the proximal connecting segment 21, and a hook hanging member 12 is provided on the distal connecting segment 11. Thus, the proximal connecting segment 21 of the iliac artery embedded branch stent 20 is inserted into the distal connecting segment 11 of one of the bifurcation stents of the abdominal main bifurcation covered stent 10, so that the hook 12 is connected to the attached member 22 to achieve a sealed connection. The distal connecting segment 11 of the iliac artery embedded branch stent 20 can be respectively set in its two embedded branch stents 30 located on the distal side. The internal iliac artery stent and the external iliac artery stent can each be provided with a proximal connecting segment 21 and an attached member 22 at least on their proximal side, so that they can be inserted into the two embedded branch stents 30 through their own proximal connecting segments 21 located on the proximal side, so that the attached member 22 is connected to the hook 12 to achieve a sealed connection.

[0071] The above description is merely a preferred 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 support system, characterized in that, The device includes a first support and a second support, each having a tubular body. The first support has a distal connecting section at its distal end and the second support has a proximal connecting section at its proximal end. The inner surface of the distal connecting section is provided with a hook, and the outer surface of the proximal connecting section is provided with a hanging part. The proximal connecting part can be inserted into the distal connecting section and connected to the first support. After connection, the hook and the hanging part are connected, thereby connecting the second support to the first support.

2. The support system according to claim 1, characterized in that, The hook includes a fixed end and a free end. The fixed end is fixedly connected to the distal connecting section, and the free end is separated from the inner surface of the distal connecting section and extends in the lumen of the distal connecting section toward the proximal end of the first bracket.

3. The support system according to claim 2, characterized in that, The hooks are provided in multiple locations, and the multiple hooks are spaced apart along the circumferential and / or axial direction of the distal connecting section.

4. The support system according to claim 1, characterized in that, The hanging component includes a hanging portion disposed circumferentially along the proximal connecting segment. The hanging portion includes a sealing connector, which is at least partially located on the outside of the proximal connecting segment and separated from the outer surface of the proximal connecting segment.

5. The support system according to claim 4, characterized in that, The proximal connecting section includes a plurality of support wave rings spaced apart axially, with a gap between two adjacent support wave rings, and the hanging part is disposed within the gap.

6. The support system according to claim 5, characterized in that, The attached component includes a first attached portion, which is arranged circumferentially along the proximal connecting segment.

7. The support system according to claim 6, characterized in that, The attached component includes a second attached part, which is arranged circumferentially along the proximal connecting section and is located on the proximal side of the first attached part on the proximal connecting section.

8. The support system according to claim 7, characterized in that, The attached component includes a third attached part, which is arranged circumferentially along the proximal connecting section and is located on the proximal connecting section at the distal end of the first attached part.

9. The support system according to claim 8, characterized in that, The first hanging part includes a first sealing connector, the second hanging part includes a second sealing connector, and the third hanging part includes a third sealing connector. The wire diameters of the first sealing connector and the second sealing connector are both larger than the wire diameter of the third sealing connector.

10. The support system according to claim 9, characterized in that, The wire density of the third sealing connector is greater than that of the first and second sealing connectors.

11. The support system according to claim 9, characterized in that, The first sealing connector and / or the second sealing connector includes a seal and a connector, wherein the wire diameter of the connector is greater than or equal to the wire diameter of the seal.

12. The support system according to any one of claims 1-11, characterized in that, The proximal side of the first bracket includes the proximal connecting segment, which includes the hanging member; the distal side of the second bracket includes the distal connecting segment, which includes the hook member.

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