Stents, embolization devices, and interventional systems

Abstract

The application provides a stent, embolism device and interventional system. The stent comprises a stent body and a plurality of fixing members. The proximal end of the stent body is folded into the fixing member to avoid the bare end from puncturing the aneurysm. The fixing member is close to the middle section to make the proximal end concave relative to the middle section and not contact the aneurysm cavity wall, thus improving the blood flow guiding effect and the blocking effect. Further, the distal end can also be folded into the fixing member, so that the proximal end and the distal end are both concave to avoid impacting the aneurysm cavity. The stent body is woven by a plurality of braided wires, at least part of the braided wires are woven to the proximal end and the distal end and then reversely woven and extended to the middle section to increase the metal coverage of the proximal end and the distal end, improve the blocking effect of the proximal end, accelerate the endothelialization, enhance the support of the proximal end and the distal end, and improve the stability and anchoring of the stent. Meanwhile, the middle section has a certain radial support and a low metal coverage to ensure the flexibility and the wall adhesion of the stent.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a stent, an embolization device, and an interventional system. Background Technology

[0002] An aneurysm is a localized or diffuse dilation or bulging of the arterial wall caused by lesions or damage to the arterial wall. It is a common cardiovascular and cerebrovascular disease. Aneurysms can occur in any part of the arterial system. Rupture of an aneurysm can lead to serious consequences, such as subarachnoid hemorrhage caused by intracranial aneurysm rupture. In severe cases, it can trigger vasospasm, leading to extensive cerebral infarction, resulting in hemiplegia and coma, hemorrhagic shock, or severe intracranial hypertension, with an extremely high mortality rate. Currently, the main treatment options for aneurysms are open surgery and endovascular interventional therapy. Open surgery requires opening the body cavity surrounding the aneurysm, such as craniotomy and thoracotomy, causing significant damage to the patient and a long recovery period. Endovascular interventional therapy for aneurysms, with its minimally invasive, safe, and effective advantages, has become the preferred clinical treatment option for many medical experts.

[0003] Currently, the main interventional vascular techniques used in clinical practice include stent-assisted coil embolization, flow diverter placement, and covered stent placement. Stent-assisted coil embolization can alter the hemodynamics at the aneurysm site, acting as a "scaffold" for endothelial growth. However, this procedure carries high risks and costs. It requires a microcatheter to deliver coils through the stent mesh to fill the aneurysm cavity. The manipulation of the microcatheter through the stent gaps is very difficult, easily resulting in vascular perforation, thus increasing the risk and cost. Furthermore, there is a risk of recurrence and rupture after the aneurysm procedure. Flow diverters primarily utilize changes in blood flow within the parent artery at the aneurysm neck to significantly reduce blood flow into the aneurysm while ensuring the patency of branch vessels. However, excessive stent metal coverage can also lead to the occlusion of other small branches. Covered stent placement works by isolating blood flow within the aneurysm to induce intra-aneurysmal thrombosis. While covered stents can isolate blood flow within an aneurysm, they also carry the risk of covering other perforating arteries and obstructing normal blood flow, potentially leading to postoperative stroke complications. Furthermore, the use of covered stents results in insufficient flexibility of the delivery system, limiting its ability to traverse tortuous intracranial vascular lesions and thus restricting its applicability.

[0004] Therefore, a new intervention device is urgently needed to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a stent, embolization device, and interventional system to address at least one of the problems of how to reduce the impact on the carrier artery and how to improve the treatment effect of aneurysm.

[0006] To solve the above-mentioned technical problems, the present invention provides a bracket, including a bracket body and a plurality of fasteners; the proximal end of the bracket body is connected to at least one of the fasteners, and at least a portion of the bracket body is bound in the fasteners, wherein the fasteners are close to the middle section of the bracket body so that the proximal end is recessed relative to the middle section;

[0007] The stent body is woven from multiple braided filaments, and at least some of the braided filaments are woven to the proximal and distal ends of the stent body and then braided in the opposite direction, extending to the middle section.

[0008] Optionally, in the bracket, when the number of the fasteners is greater than or equal to 2, the distal end is connected to at least one of the fasteners and bound in the fastener, and the fastener is close to the middle section of the bracket body so that the distal end is recessed relative to the middle section.

[0009] Optionally, in the bracket, the connection method between the proximal end and the distal end and the fixation member includes welding or medical adhesive bonding.

[0010] Optionally, in the aforementioned stent, the porosity of the proximal end and the distal end is less than the porosity of the intermediate segment.

[0011] Optionally, in the bracket, the areas covered by the reverse weaving at the opposite ends of the middle section respectively occupy 1 / 4 to 1 / 3 of the outer surface of the middle section.

[0012] Optionally, in the bracket, at least a portion of the braided filaments are woven back and forth between the proximal end and the intermediate segment, and between the distal end and the intermediate segment.

[0013] Optionally, in the bracket, the braided filaments are 48 to 288 strands.

[0014] Optionally, in the bracket, the bracket body is a self-expanding braided bracket, having an expanded state and a compressed state; and in the expanded state, the outer contour of the middle section is arched or cylindrical.

[0015] Optionally, in the bracket, the maximum diameter of the bracket body in the expanded state ranges from 3 mm to 16 mm.

[0016] Optionally, in the stent, in the inflated state, the middle section conforms to the aneurysm cavity wall, and the proximal end faces the blood vessel to seal the aneurysm cavity opening.

[0017] Optionally, in the bracket, the bracket body includes a developing member, which is woven into a mesh with the braided filaments.

[0018] Optionally, in the bracket, the developing member includes the braided wire and the developing coil; the developing coil is wound on the braided wire and covers at least a portion of the braided wire.

[0019] Optionally, in the bracket, the developing coil material includes one or any combination of platinum-tungsten alloy, platinum-iridium alloy, pure platinum, gold, and tantalum wire.

[0020] Optionally, in the bracket, the fixing element includes: a ring, a round cap, and a spiral tube, and the material of the fixing element includes a developing material.

[0021] Based on the same inventive concept, the present invention also provides an embolization device, including a delivery rod and the bracket, wherein the bracket and the delivery rod are connected by a release wire.

[0022] Based on the same inventive concept, the present invention also provides an interventional system, including a microcatheter, a microguidewire, and the aforementioned embolization device, wherein the microcatheter and microguidewire are used to deliver the embolization device.

[0023] In summary, this invention provides a stent, an embolization device, and an interventional system. The stent, used to occlude an aneurysm, includes a stent body and several fixation members. The proximal end of the stent body is converged into a corresponding fixation member to prevent its bare end from puncturing the aneurysm cavity. Simultaneously, the fixation members are positioned closer to the intermediate segment, causing the proximal end to be concave relative to the intermediate segment. Furthermore, the distal end of the stent body can also be bound within the fixation members, resulting in both the proximal and distal ends being concave and not contacting the aneurysm cavity wall, thus preventing impact on the aneurysm cavity from the distal end. Moreover, the stent body is woven from multiple braided filaments, with at least some of these filaments braided to the proximal and distal ends and then reverse-braided, extending to the intermediate segment. This increases the metal coverage of the proximal and distal ends, allowing the proximal end to better exert its blood flow guiding and occlusion effects, accelerating endothelialization and improving the treatment outcome of the aneurysm; it also enhances the support of the proximal end, improving the stability of the stent. Meanwhile, the middle section has a certain radial support force, and has a low metal coverage and high porosity to ensure the flexibility and wall adhesion of the support.

[0024] Therefore, the stent, embolization device, and interventional system provided by the present invention can not only avoid the impact on the carrier artery, but also improve the treatment effect of aneurysm. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the first type of bracket in an embodiment of the present invention.

[0026] Figure 2 This is a schematic diagram of the first type of stent located in the tumor cavity in an embodiment of the present invention.

[0027] Figure 3 This is a schematic diagram of the longitudinal section of the developing component in an embodiment of the present invention.

[0028] Figure 4 This is a schematic diagram of the proximal end of the stent in an embodiment of the present invention.

[0029] Figure 5 This is a schematic diagram of the structure of the distal end of the support in an embodiment of the present invention.

[0030] Figure 6 This is a schematic diagram of the structure of the second type of bracket in an embodiment of the present invention.

[0031] Figure 7 This is a schematic diagram of the structure of the third type of bracket in this embodiment of the invention.

[0032] Figure 8 This is a schematic diagram of the third type of stent located in the tumor cavity in an embodiment of the present invention.

[0033] Figure 9 This is a schematic diagram of the fourth type of support in an embodiment of the present invention.

[0034] The accompanying diagram is described as follows:

[0035] 10-Stent body; 101-Proximal end; 102-Middle segment; 103-Distal end; 20-Fixture; 30-Aneurysm; 40-Vascular vessel; a-Braided wire; b-Iconizing component; b1-Braided wire in the imconizing component; b2-Iconizing coil. Detailed Implementation

[0036] To make the objectives, advantages, and features of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the drawings are all in a very simplified form and are not drawn to scale, and are only used to facilitate and clearly illustrate the objectives of the embodiments of the present invention. Furthermore, the structures shown in the drawings are often part of the actual structures. In particular, different figures may emphasize different aspects and sometimes use different scales. It should also be understood that, unless specifically stated or indicated, the terms "first," "second," "third," etc., in the specification are only used to distinguish the various components, elements, steps, etc., in the specification, and are not used to indicate the logical or sequential relationships between the various components, elements, steps, etc.

[0037] In this article, "proximal" and "distal" are defined as follows: "distal" usually refers to the end of the medical device that first enters the patient's body during normal operation, while "proximal" usually refers to the end of the medical device that is closest to the operator during normal operation.

[0038] To address the aforementioned technical problems, this embodiment provides a support. Please refer to [link / reference]. Figure 1 The stent includes a stent body 10 and a plurality of fasteners 20; the proximal end 101 of the stent body is connected to at least one of the fasteners 20, and at least a portion of the stent body 10 is bound in the fastener 20, the fastener 20 being close to the middle section 102 of the stent body 10, so that the proximal end 101 is recessed relative to the middle section 102; wherein, the stent body 10 is woven from a plurality of braiding filaments a, and at least a portion of the braiding filaments a are woven to the proximal end 101 and the distal end 103 of the stent body 10 and then braided in the opposite direction, extending to the middle section 102.

[0039] The stent provided in this embodiment not only alleviates the impact on the carrier artery of the aneurysm but also improves the treatment effect of the aneurysm. The following is in conjunction with the appendix... Figure 1-6 The bracket provided in this embodiment will be described in detail.

[0040] Please see Figures 1-2 The stent provided in this embodiment is used in a blood vessel containing an aneurysm 30 to seal the aneurysm. The stent includes a stent body 10 and a plurality of fixation members 20. The stent body 10 has a proximal end 101, a middle section 102, and a distal end 103 connected in sequence. Further, the stent body 10 is a braided stent with self-expanding properties, having an expanded state and a compressed state, and is woven from multiple braided filaments a. Optionally, the stent body 10 uses 48 to 288 braided filaments a to form a mesh structure, for example, using 48 braided filaments a, or using 144 braided filaments a, etc., and this embodiment does not limit this. Furthermore, the braided filaments a are braided from the middle outwards to form a tubular braided structure. When the braided filaments a reach the proximal end 101 and the distal end 103, at least a portion of the braided filaments a are braided in the opposite direction until they extend to the middle section 102. This is to increase the metal coverage of the proximal end 101 and the distal end 103 and reduce the porosity. Of course, depending on the specific porosity requirements, all the braided filaments a can continue to be braided in the opposite direction, or a portion of the braided filaments a can be selected to be braided in the opposite direction. Alternatively, at least a portion of the braided filaments a can be selected to be braided back and forth between the proximal end 101 and the middle section 102, and between the distal end 103 and the middle section 102, to increase the metal coverage of the proximal end 101 and the distal end 103 and reduce the porosity.

[0041] It should be noted that the reverse weaving refers to the weaving of the braided filament a to the proximal end 101 or the distal end 103, then folding it over and weaving towards the middle section 102. The reciprocating weaving refers to the weaving filament a folding over from the proximal end 101 or the distal end 103 and weaving towards the middle section 102, then folding it over again towards the proximal end 101 or the distal end 103 after reaching the middle section 102, and so on. Furthermore, each time it is folded over, a portion of the braided filament a at certain locations can be selected to continue weaving, or all the braided filaments a can be folded over and woven to meet the requirements of different porosities.

[0042] Based on this, the metal coverage of the proximal end 101 and distal end 103 of the stent body 10 is greater than that of the intermediate section 102, and the porosity of the proximal end 101 and distal end 103 is less than that of the intermediate section. For example... Figure 2 As shown, after the stent is implanted into the aneurysm 30, the distal end 103 extends into the aneurysm 30, the intermediate segment 102 adheres to the aneurysm cavity wall of the aneurysm 30, and the proximal end 101 seals the aneurysm opening, facing the blood vessel 40. It can be understood that the reverse weaving of the proximal end 101 increases the metal coverage and reduces the porosity, thereby enhancing blood flow guidance and improving the occlusion effect. That is, a higher metal coverage can accelerate intimal hyperplasia at the aneurysm neck, inducing thrombus formation at the aneurysm neck and improving the occlusion effect; and guide the blood flow within the blood vessel 40 along the direction of blood vessel extension, preventing the blood flow within the blood vessel 40 from impacting and entering the aneurysm 30, causing the aneurysm 30 to rupture. Similarly, the reverse weaving of the distal end 103 to increase the metal coverage and reduce the porosity also utilizes the hyperplastic intimal to improve the anchoring of the stent body 10, avoiding other complications caused by displacement or slippage of the stent body 10. Furthermore, the increased metal coverage of the distal end 103 can also enhance the support of the support body 10.

[0043] The intermediate segment 102 has a lower metal coverage than the proximal end 101 and the distal end 102, and its porosity is higher than that of the proximal end 101 and the distal end 102. This is to ensure the flexibility and wall adhesion of the intermediate segment 102. Because the intermediate segment 102 is designed to rapidly expand from a compressed state to an expanded state and adhere to the aneurysm wall to stabilize the stent and ensure occlusion, it needs to have good anchoring and flexibility. In this embodiment, the porosity of the intermediate segment 102 is higher than that of the proximal end 101 and the distal end 103 to ensure its wall adhesion and anchoring, preventing the stent body 10 from slipping and detaching from the aneurysm 30. Furthermore, the intermediate segment 102 is self-elastic, allowing it to act relatively gently within the aneurysm 30. In addition, the intermediate segment 102 also needs to have radial support to ensure wall adhesion. Therefore, the areas covered by the reverse braiding at the opposite ends of the intermediate segment 102 account for 1 / 4 to 1 / 3 of the outer surface of the intermediate segment 102, respectively. In other words, the reverse braided threads in the proximal end 101 and distal end 103 of the support body 10 extend into the intermediate segment 102, thereby increasing the metal coverage at the ends of the intermediate segment 102 that connect with the proximal end 101 and the distal end 103, thus improving the radial support force of the intermediate segment 102. To ensure the flexibility of the intermediate segment 102, the reverse braided threads cannot completely cover the intermediate segment 102. Therefore, the surface area covered by the reverse braided threads at any end of the intermediate segment 102 only accounts for 1 / 4 to 1 / 3 of the total surface area of ​​the intermediate segment 102. For example, if the intermediate section 102 is cylindrical and has the same cross-section everywhere, then the axial length of the area covered by reverse braided yarns on the end of the intermediate section 102 near the proximal end 101 is 1 / 4 of the total axial length of the intermediate section 102. Furthermore, the intermediate section 102 is also provided with barbs to further improve the anchoring stability of the support body 10.

[0044] Please see Figures 3-5 The braided filament a is made of a biocompatible material with shape memory properties containing elements such as nickel and titanium, including but not limited to nickel-titanium alloys, cobalt-chromium alloys, tantalum wire, or precious metal materials and composite materials with developing properties. Furthermore, the scaffold body 10 also includes a developing component b, which is woven into a mesh structure with the braided filament a. Further, the developing component b includes the braided filament b1 and a developing coil b2; the developing coil b2 is wound on the braided filament b1 and covers at least a portion of the braided filament b1. It should be noted that the braided filament b1 in the developing component b is the same as the braided filament a in the scaffold body 10. Please refer to [link to relevant documentation]. Figure 3The cross-sectional view of the developing component b is shown. The developing coil b2 is fixed to the braided wire b1 in the form of a spring. Optionally, the developing coil b2 completely covers the braided wire b1 along its axial direction, that is, the outer surface of the braided wire b1 is in contact with the coil of the developing coil b2. Then, when the developing component b is woven into a web with the braided wire a, it can form a web as shown in the diagram. Figure 4 and 5 The illustrated stent structure. Furthermore, the imaging coil b2 may only cover a portion of the braided wire b1. For example, multiple imaging coils b2 are wound around the braided wire b1, and the imaging coils b2 are arranged at equal intervals or proportionally along the axial direction of the braided wire b1 to meet different imaging needs; this embodiment does not specifically limit this. Preferably, the imaging coil b2 is made of one or more of the following materials: platinum-tungsten alloy, platinum-iridium alloy, pure platinum, gold, and tantalum wire. In summary, the imaging component b provided in this embodiment, woven within the stent, can meet the intraoperative need for obtaining key information such as the shape, position, and state of the stent. Moreover, the imaging coil b2 is tightly wound around the braided wire b1, which not only improves the imaging stability of the stent and ensures better imaging effects but also helps to ensure the stent's expansion and recovery performance.

[0045] Please see Figures 1-2 In section 6, the proximal end 101 is connected to the fixation member 20, and at least a portion of the stent body 10 is bound within the fixation member 20. The fixation member 20 is positioned closer to the middle section 102 of the stent body 10, causing the proximal end 101 to be recessed relative to the middle section 102. It is understood that the proximal end 101 of the stent body 10 is gathered within the fixation member 20, resulting in a closed shape. This not only prevents the bare ends of the braided wires at the proximal end 101 from puncturing the aneurysm 30 wall and the vessel wall, but also facilitates endothelialization of the proximal end 101, achieving a blood flow guiding effect and a occlusion effect. In this embodiment, the number of fixation members 20 is not limited; one fixation member 20 can gather all the bare ends of the proximal end 101; or two or three fixation members 20 can be used to gather all the bare ends of the proximal end 101. Furthermore, this embodiment does not specifically limit the morphology of the distal end 103 of the stent body 10. Optionally, such as Figures 1-2 As shown, the distal end 103 can also be folded into at least one of the fasteners 20; or, as Figure 6 As shown, the distal end 103 is unrestrained and has an open shape.

[0046] Please continue reading. Figures 1-2In the first type of stent shown, both the proximal end 101 and the distal end 103 are retracted into their corresponding fixation members 20 to prevent the bare ends from puncturing the aneurysm 30 cavity. Each of the proximal end 101 and the distal end 103 can correspond to one fixation member 20, or two or more fixation members 20 can be provided. The corresponding fixation members 20 are positioned closer to the intermediate segment 102, so that the proximal end 101 and the distal end 103 are concave relative to the intermediate segment 101. Thus, within the aneurysm 30 cavity, the bulging intermediate segment 102 can conform to the cavity wall, while the concave proximal end 101 and the distal end 103 do not contact the cavity wall. Retracting the distal end 103 into the fixation member 20 and concave it towards the intermediate segment 102 prevents the distal end 103 from impacting the aneurysm cavity. By bringing the proximal end 101 into the fixing member 20 and recessing it toward the middle section 102, a good blood flow guidance and occlusion effect can be achieved.

[0047] Please continue reading. Figure 6 The second type of stent shown has its proximal end 101 converged within at least one fixation member 20, while its distal end 103 is open and adheres to the aneurysm 30 cavity wall along with the intermediate section 102, ensuring the radial support and anchoring of the stent. Preferably, the braided filaments a at the free end of the distal end 103 are all looped. That is, each braided filament a is folded back towards the intermediate section 102 after being woven to the edge of the distal end 103, thereby preventing the tips of the braided filaments a at the distal end 103 from puncturing the aneurysm cavity wall.

[0048] Furthermore, the fixing member 20 is made of a thin-walled metal component, including but not limited to a ring, a cap, and a spiral tube. The fixing member 20 is fixedly connected to the proximal end 101 and the distal end 103, thereby restraining the free ends of the proximal end 101 and the distal end 103 and preventing the braided filaments a from disintegrating due to radial force generated by the increased metal coverage. The connection method includes, but is not limited to, medical adhesive bonding, riveting, ion welding, or laser welding. Preferably, the material of the fixing member 20 includes a radiopaque material to serve a positioning function.

[0049] Because the aneurysms 30 have different shapes, heat treatment can be used to shape them so that the stent has different shapes in the expanded state, in order to better fit the aneurysm cavity wall. Specifically, in the expanded state, the proximal end 101 and the distal end 103 of the stent are recessed into the intermediate segment 102, and the intermediate segment 102 bulges to fit the inner wall of the aneurysm 30. The shape of the outer contour of the intermediate segment 102 includes, but is not limited to, an arch or a cylinder. For example... Figures 1-2 The first type of support shown has a cylindrical middle section 102. Alternatively, as... Figure 6The second type of bracket shown and Figures 7-8 The third type of support shown has a non-spherical intermediate segment 102. Alternatively, as... Figure 9 The fourth type of stent shown corresponds to an arched intermediate segment 102. Of course, the stent provided in this embodiment is not limited to the above-described shape; it can also be semi-circular or semi-elliptical, etc. It is understood that the outer contour of the intermediate segment 102 is smooth, without protrusions or sharp corners, so that the aneurysm 30 will not rupture due to concentrated stress.

[0050] Based on the same inventive concept, this embodiment also provides an embolization device. The embolization device includes a delivery rod and the aforementioned stent, the stent being connected to the delivery rod via a release wire. Once the stent is delivered to the corresponding lesion location, the release wire separates the stent from the delivery rod, thereby releasing the stent to the lesion location.

[0051] Based on the same inventive concept, this embodiment also provides an interventional system. The interventional system includes a microcatheter, a microguidewire, and the aforementioned embolization device, wherein the microcatheter and microguidewire are used to deliver the embolization device. Specifically, before occluding the aneurysm 30 with the stent, angiography is first performed to determine the location, size, neck extent, and distribution of branch vessels of the aneurysm 30, and a stent of appropriate shape and size is selected. Then, the stent is connected to the delivery rod via the release wire to form the embolization device, and the embolization device is installed in the interventional system. During the procedure, the microguidewire is first placed near the corresponding vascular lesion location, then the microcatheter travels along the microguidewire to the corresponding lesion site, and then the microguidewire is removed. Finally, the embolization device is placed in the lumen of the microcatheter, and the stent is pushed to the lesion site through the lumen of the microcatheter. After the stent is released, the release wire is disconnected, separating the stent from the delivery rod, thereby releasing the stent.

[0052] In summary, this embodiment provides a stent, an embolization device, and an interventional system. The stent, used to occlude an aneurysm, includes a stent body 10 and several fixation members 20. The proximal end 101 of the stent body 10 is recessed into a corresponding fixation member 20 to prevent its bare end from puncturing the aneurysm cavity. Simultaneously, the fixation members 20 are positioned closer to the intermediate segment 102, causing the proximal end 101 to be concave relative to the intermediate segment 102. Furthermore, the distal end 103 of the stent body 10 can also be bound within the fixation member 20, resulting in both the proximal end 101 and the distal end 103 being concave and not contacting the aneurysm cavity wall, thus preventing impact on the aneurysm cavity from the distal end 103. Furthermore, the stent body 10 is woven from multiple braided filaments, with at least some of the braided filaments a braided to the proximal end 101 and the distal end 103 and then braided in the opposite direction, extending to the intermediate segment 102. This increases the metal coverage of the proximal end 101 and the distal end 103, allowing the proximal end 101 to better exert its blood flow guiding and occlusion effects, accelerating endothelialization and improving the treatment effect of aneurysms; and also enhancing the support force of the distal end 103, improving the stability of the stent. Simultaneously, the intermediate segment 102 has a certain radial support force, a lower metal coverage, and a higher porosity, ensuring the stent's flexibility and wall apposition, allowing it to adhere to the cavity wall of the aneurysm 30 in the expanded state. Therefore, the stent, embolization device, and interventional system provided in this embodiment not only alleviate the impact on the carrier artery but also improve the treatment effect of aneurysms.

[0053] Furthermore, it should be understood that although the present invention has been disclosed above with reference to preferred embodiments, these embodiments are not intended to limit the present invention. For any person skilled in the art, many possible variations and modifications can be made to the technical solutions of the present invention based on the disclosed technical content, or equivalent embodiments can be modified accordingly, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the content of the present invention, shall still fall within the scope of protection of the present invention.

Claims

1. A support, characterized in that, It includes a support body and several fasteners; the proximal end of the support body is connected to at least one of the fasteners, and at least a portion of the support body is bound in the fasteners, the fasteners being close to the middle section of the support body so that the proximal end is recessed relative to the middle section; The stent body is woven from the middle position towards both sides by multiple braided wires, and at least some of the braided wires are woven to the proximal and distal ends of the stent body and then braided in the opposite direction, extending to the middle section. At least some of the braided filaments are woven back and forth between the proximal end and the middle section, and between the distal end and the middle section; the back and forth weaving includes at least two folds, and at each fold, some or all of the braided filaments at some locations are in a continuing weaving state so that the porosity at different locations is different.

2. The bracket according to claim 1, characterized in that, When the number of the fasteners is greater than or equal to 2, the distal end is connected to at least one of the fasteners and is secured in the fastener, and the fastener is close to the middle section of the bracket body so that the distal end is recessed relative to the middle section.

3. The bracket according to claim 2, characterized in that, The connection methods between the proximal end and the distal end and the fixing member include welding or medical adhesive bonding.

4. The bracket according to claim 1, characterized in that, The porosity of the proximal end and the distal end is less than the porosity of the intermediate section.

5. The bracket according to claim 1, characterized in that, The areas covered by the reverse weaving at the opposite ends of the middle section each account for 1 / 4 to 1 / 3 of the outer surface of the middle section.

6. The bracket according to claim 1, characterized in that, The braided yarn consists of 48 to 288 strands.

7. The bracket according to claim 1, characterized in that, The support body is a self-expanding braided support, which has an expanded state and a compressed state; and in the expanded state, the outer contour of the middle section is arched or cylindrical.

8. The bracket according to claim 7, characterized in that, In the expanded state, the maximum diameter of the support body ranges from 3mm to 16mm.

9. The bracket according to claim 7, characterized in that, In the expanded state, the middle section adheres to the tumor cavity wall, and the proximal end faces the blood vessel to seal the tumor cavity opening.

10. The stent according to claim 1, characterized in that, The support body includes a developing component, which is woven into a mesh with the braided filaments.

11. The stent according to claim 10, characterized in that, The developing component includes the braided wire and the developing coil; the developing coil is wound on the braided wire and covers at least a portion of the braided wire.

12. The bracket according to claim 11, characterized in that, The developing coil material includes one or more of the following materials: platinum-tungsten alloy, platinum-iridium alloy, pure platinum, gold, and tantalum wire.

13. The bracket according to claim 1, characterized in that, The fixing component includes: a ring, a round cap, and a spiral tube, and the material of the fixing component includes a developing material.

14. An embolization device, characterized in that, It includes a conveyor rod and a bracket as described in any one of claims 1 to 13, wherein the bracket is connected to the conveyor rod by a release wire.

15. An intervention system, characterized in that, It includes microcatheters, microwires, and the embolization device as described in claim 14, wherein the microcatheters and microwires are used to deliver the embolization device.

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