An intravascular stent

Abstract

This invention relates to an endovascular stent, comprising a first sub-stent and a second sub-stent, both woven from multiple braided filaments into a mesh-like structure; the first sub-stent and the second sub-stent are coaxially arranged; a flexible element is connected at one end to one end of the first sub-stent and at the other end to one end of the second sub-stent; the flexible element has a helical or variable-diameter helical structure; when the flexible element has a variable-diameter helical structure, the outer diameter of the flexible element gradually increases and then gradually decreases from the proximal end to the distal end; by adjusting the distance between the first sub-stent and the second sub-stent, the flexible element undergoes elastic deformation, thereby adjusting the metal coverage between the first sub-stent and the second sub-stent.

Description

Technical Field

[0001] This invention relates to the field of endovascular stent technology, and particularly to an endovascular stent. Background Technology

[0002] Intracranial aneurysms are a common cerebrovascular disease. Rupture and bleeding of an aneurysm can lead to severe neurological dysfunction and even death. Clinically, coil embolization is commonly used to treat aneurysms. However, for aneurysms with complex shapes, simple coil embolization has limitations. For example, the coils can easily slip out of the aneurysm, or the embolization may not be dense enough, leading to aneurysm recurrence. To address these issues, stent-assisted coil embolization is often used. This technique involves implanting a stent within the parent vessel to provide mechanical support for the coils located within the aneurysm cavity, effectively improving the stability of the coil embolization. It is also suitable for complex types of aneurysms, such as those located at vessel bifurcation points.

[0003] While stent-assisted coil embolization can treat complex types of aneurysms, the primary function of existing stents is to provide simple support for coils. However, slight displacement of the coils or incomplete occlusion can still occur later, leading to a risk of aneurysm recurrence. High metal coverage methods often promote aneurysm healing. Existing braided stents can reduce the mesh area through compression, increasing metal coverage at the aneurysm neck. However, this can cause the stent to form a layer at the aneurysm neck that resembles a coiled coil. Figure 1 The spindle-shaped structure shown increases metal coverage at the aneurysm neck, but the portion of the stent outside the neck cannot adhere tightly to the vessel wall, increasing the risk of intravascular stenosis and thrombosis. For aneurysms located at vessel bifurcation points, the Y-shaped stent technique uses two stents stacked together. This method is complex to operate, hinders its widespread adoption, and also carries the risk of intravascular stenosis and thrombosis. Summary of the Invention

[0004] To solve, or at least partially solve, the above-mentioned technical problems, the present invention provides an intravascular stent.

[0005] This invention provides an endovascular stent comprising a first sub-stent, a second sub-stent, and a flexible element. Both the first and second sub-stents are woven from multiple braided filaments into a mesh-like structure. The first and second sub-stents are coaxially aligned. One end of the flexible element is connected to one end of the first sub-stent, and the other end is connected to one end of the second sub-stent. The flexible element has a helical or variable-diameter helical structure. When the flexible element has a variable-diameter helical structure, its outer diameter gradually increases and then gradually decreases from the proximal end towards the distal end. By adjusting the distance between the first and second sub-stents, the flexible element undergoes elastic deformation, thereby adjusting the metal coverage between the first and second sub-stents.

[0006] The present invention also provides an endovascular stent, comprising a first sub-stent, a second sub-stent, and a flexible component. The first sub-stent is woven from multiple braided filaments into a mesh-like structure; the second sub-stent is also woven from multiple braided filaments into a mesh-like structure; the first and second sub-stents are coaxially arranged; one end of the flexible component is connected to one end of the first sub-stent, and the other end of the flexible component is connected to one end of the second sub-stent; by adjusting the distance between the first and second sub-stents, the flexible component undergoes elastic deformation, thereby adjusting the metal coverage between the first and second sub-stents.

[0007] Optionally, the flexible component includes a flexible element, one end of which is connected to one end of the first sub-support, and the other end of which is connected to one end of the second sub-support; the flexible element has a spiral or variable diameter spiral structure; when the flexible element has a variable diameter spiral structure, the outer diameter of the flexible element gradually increases and then gradually decreases from the direction of the proximal end to the direction of the distal end.

[0008] Optionally, the flexible component includes multiple first flexible filaments, all of which are spiral, variable diameter spiral, or straight filaments; the multiple first flexible filaments are evenly distributed around the axis of the first sub-support.

[0009] Optionally, the flexible component includes multiple first flexible wires, which are evenly distributed around the axis of the first sub-support; the first flexible wires have at least one deformable segment in the middle that is wound clockwise or counterclockwise in a ring shape.

[0010] Optionally, the first flexible wire has multiple deformation segments in the middle; all of the multiple deformation segments are wound clockwise or counterclockwise.

[0011] Optionally, the first flexible filament has multiple deformation segments in the middle; some deformation segments are wound clockwise, and other deformation segments are wound counterclockwise.

[0012] Optionally, the flexible component includes multiple first flexible filaments and multiple second flexible filaments. The multiple first flexible filaments are all in a spiral or variable diameter spiral structure. The multiple first flexible filaments are evenly distributed around the axis of the first sub-support and are located on one side of the axis of the first sub-support. The multiple second flexible filaments are all in a straight or wavy structure. The multiple second flexible filaments are evenly distributed around the axis of the first sub-support and are located on the other side of the axis of the first sub-support. When the first flexible filaments are in a variable diameter spiral structure, the outer diameter of the first flexible filaments gradually increases and then gradually decreases from the direction of the proximal end to the direction of the distal end.

[0013] Optionally, the flexible component includes multiple first flexible filaments and multiple second flexible filaments. The multiple first flexible filaments are evenly distributed around the axis of the first sub-support and are located on one side of the axis of the first sub-support. The middle of each first flexible filament has at least one deformable segment that is wound clockwise or counterclockwise in a loop. The multiple second flexible filaments are all straight or wavy. The multiple second flexible filaments are evenly distributed around the axis of the first sub-support and are located on the other side of the axis of the first sub-support.

[0014] Optionally, the flexible component includes multiple first flexible wires and multiple second flexible wires. The multiple first flexible wires are all straight wires. The multiple first flexible wires are evenly distributed around the axis of the first sub-support. The multiple second flexible wires are all spiral or variable diameter spiral structures. Each second flexible wire is respectively sleeved on a first flexible wire.

[0015] Optionally, the flexible component includes a plurality of first flexible filaments evenly distributed around the axis of the first sub-support; the first flexible filament includes a deformation section, which is composed of a plurality of spiral flexible sub-filaments evenly distributed around the axis of the first flexible filament.

[0016] Optionally, the flexible component includes multiple first flexible filaments and second flexible filaments. The multiple first flexible filaments are all straight or wavy. The multiple first flexible filaments are evenly distributed around the axis of the first sub-support. The second flexible filaments are spiral or variable diameter spiral and are sleeved on the multiple first flexible filaments.

[0017] Optionally, the flexible component further includes a third flexible filament, which is helical or variable diameter helical and is sleeved on the second flexible filament; the helical direction of the third flexible filament is opposite to that of the second flexible filament.

[0018] Optionally, the outer diameter of the end of the first sub-stent closest to the second sub-stent gradually increases from the direction of the distal end to the direction of the proximal end; when the second sub-stent moves toward the first sub-stent and one end of the second sub-stent is located inside the first sub-stent, an accommodating interlayer is formed between the first sub-stent and the second sub-stent.

[0019] The entire flexible component is located within the receiving interlayer; or a portion of the flexible component is located within the receiving interlayer, while another portion of the flexible component is located outside the receiving interlayer and enters the aneurysm cavity.

[0020] In this embodiment, by moving the second sub-stent closer to or further away from the first sub-stent, the cooperation of the first and second sub-stents compresses or stretches the flexible component, causing elastic deformation and changing the gap size of the flexible component. This achieves the purpose of adjusting the metal coverage of the flexible component, and also the purpose of adjusting the metal coverage between the first and second sub-stents. Compared with the prior art, this embodiment has a larger adjustment range for the metal coverage between the first and second sub-stents, and adjusting the metal coverage does not affect the outer diameter of the first or second sub-stent, resulting in better adhesion of the first and second sub-stents to the vessel wall. It also further enhances the support of the coils located in the aneurysm cavity. The synergistic cooperation between the metal coverage of the first and second sub-stents and the coils located in the aneurysm cavity improves the sealing effect of the flexible component on the aneurysm neck, increasing the embolization rate of the aneurysm cavity. Attached Figure Description

[0021] To more clearly illustrate the embodiments of the present invention, the relevant accompanying drawings will be briefly described below. It should be understood that the drawings described below are only for illustrating some embodiments of the present invention, and those skilled in the art can obtain many other technical features and connections not mentioned herein based on these drawings.

[0022] Figure 1 This is a background technical diagram;

[0023] Figure 2 This is a schematic diagram of one embodiment of an endovascular stent of the present invention. Figure 1 ;

[0024] Figure 3 This is a schematic diagram of one embodiment of an endovascular stent of the present invention. Figure 2 ;

[0025] Figure 4 This is a schematic diagram of one embodiment of an endovascular stent of the present invention. Figure 3 ;

[0026] Figure 5 This is a cross-sectional schematic diagram of an embodiment of an intravascular stent of the present invention. Figure 1 ;

[0027] Figure 6 This is a schematic diagram of an embodiment of the present invention, in which an intravascular stent is located within a blood vessel. Figure 1 ;

[0028] Figure 7 This is a cross-sectional schematic diagram of an embodiment of an intravascular stent of the present invention. Figure 2 ;

[0029] Figure 8 This is a schematic diagram of one embodiment of an endovascular stent of the present invention. Figure 4 ;

[0030] Figure 9 This is a cross-sectional schematic diagram of an embodiment of an intravascular stent of the present invention. Figure 3 ;

[0031] Figure 10 This is a schematic diagram of one embodiment of an endovascular stent of the present invention. Figure 5 ;

[0032] Figure 11 This is a schematic diagram of one embodiment of an endovascular stent of the present invention. Figure 6 ;

[0033] Figure 12 This is a schematic diagram of an embodiment of the present invention, in which an intravascular stent is located within a blood vessel. Figure 2 ;

[0034] Figure 13 This is a schematic diagram of an embodiment of the first flexible wire of an intravascular stent according to the present invention. Figure 1 ;

[0035] Figure 14 This is a schematic diagram of an embodiment of the first flexible wire of an intravascular stent according to the present invention. Figure 2 ;

[0036] Figure 15 This is a schematic diagram of an embodiment of the first flexible wire of an intravascular stent according to the present invention. Figure 3 ;

[0037] Figure 16 This is a schematic diagram of one embodiment of an endovascular stent of the present invention. Figure 7 ;

[0038] Figure 17 This is a schematic diagram of one embodiment of an endovascular stent of the present invention. Figure 8 ;

[0039] Figure 18 This is a schematic diagram of one embodiment of an endovascular stent of the present invention. Figure 9 ;

[0040] Figure 19 This is a schematic diagram of an embodiment of the present invention, in which an intravascular stent is located within a blood vessel. Figure 3 ;

[0041] Figure 20 This is a schematic diagram of one embodiment of an endovascular stent of the present invention. Figure 10 ;

[0042] Figure 21 This is a schematic diagram of an embodiment of the connection between the first flexible wire and the second flexible wire of an intravascular stent according to the present invention;

[0043] Figure 22 This is a schematic diagram of one embodiment of an endovascular stent of the present invention. Figure 10 one;

[0044] Figure 23 This is a schematic diagram of an embodiment of the first flexible wire of an intravascular stent according to the present invention. Figure 4 ;

[0045] Figure 24 This is a schematic diagram of one embodiment of an endovascular stent of the present invention. Figure 10 two;

[0046] Figure 25 This is a schematic diagram of an embodiment of the first flexible wire of an intravascular stent according to the present invention. Figure 5 ;

[0047] Figure 26 This is a schematic diagram of one embodiment of an endovascular stent of the present invention. Figure 10 three;

[0048] Figure 27 This is a schematic diagram of one embodiment of an endovascular stent of the present invention. Figure 10 Four;

[0049] Figure 28 This is a schematic diagram of one embodiment of an endovascular stent of the present invention. Figure 10 five;

[0050] Figure 29 This is a schematic diagram of an embodiment of the first sub-stent of an intravascular stent according to the present invention;

[0051] Figure 30 This is a schematic diagram of one embodiment of an endovascular stent of the present invention. Figure 10 six;

[0052] Figure 31 This is a schematic diagram of an embodiment of the present invention, in which an intravascular stent is located within a blood vessel. Figure 4 .

[0053] Explanation of reference numerals in the attached figures:

[0054] 11. First sub-support; 12. Second sub-support; 13. Braided wire; 14. Variable diameter section; 21. Flexible component; 22. First flexible wire; 23. Deformation section; 24. Second flexible wire; 25. First connecting section; 26. Second connecting section; 27. Flexible sub-wire; 28. Third flexible wire. Detailed Implementation

[0055] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0056] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0057] In this disclosure, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for better description of the embodiments of this disclosure and their implementations, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to require them to be constructed and operated in a specific orientation. Furthermore, some of the aforementioned terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in the embodiments of this disclosure according to the specific circumstances.

[0058] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0059] Unless otherwise stated, the term "multiple" means two or more, and "multiple groups" means two or more groups.

[0060] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.

[0061] The inventors discovered that compressing existing braided stents can improve metal coverage at the aneurysm neck, but this causes the stent to form a scuff-like structure at the aneurysm neck. Figure 1 The spindle-shaped structure shown has a portion of the stent outside the neck of the aneurysm that cannot adhere tightly to the inner wall of the blood vessel, which can easily lead to the risk of vascular stenosis and thrombosis.

[0062] The inventors also conducted a search of existing technologies, and the following existing technologies were found:

[0063] Prior art 1: Invention patent with publication number CN115429372B;

[0064] Prior art 2: Invention patent application with publication number CN119587100A.

[0065] In view of this, the inventors of the present invention provide an endovascular stent to solve the above-mentioned problems. Several specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0066] First Embodiment

[0067] The endovascular stent mentioned in this embodiment, such as Figure 2 , Figure 3 As shown, the endovascular stent includes a first sub-stent 11, a second sub-stent 12, and a flexible element 21. The first sub-stent 11 is woven from multiple braided filaments 13 into a mesh-like structure, and the second sub-stent 12 is also woven from multiple braided filaments 13 into a mesh-like structure. The first sub-stent 11 and the second sub-stent 12 are arranged coaxially. The diameter of the braided filaments 13 used to form the first sub-stent 11 is the same as the diameter of the braided filaments 13 used to form the second sub-stent 12. The first sub-stent 11 is connected to the second sub-stent 12 via the flexible element 21.

[0068] Optionally, the outer diameter of the first sub-support 11 is the same as the outer diameter of the second sub-support 12.

[0069] In this embodiment, the specific configuration of the flexible component 21 is as follows:

[0070] Optional, such as Figure 2As shown, the flexible element 21 has a spiral structure. The outer diameter of the flexible element 21 is the same as the outer diameter of the first sub-support 11, and the diameter of the filaments in the flexible element 21 is the same as the diameter of the braided filaments 13 that form the first sub-support 11, i.e., the flexible element 21 has a spring-like structure. Alternatively, the diameter of the filaments in the flexible element 21 may be larger than the diameter of the braided filaments 13 that form the first sub-support 11. The end of the flexible element 21 near the distal end is connected to the end of the first sub-support 11 near the proximal end, and the end of the flexible element 21 near the proximal end is connected to the end of the second sub-support 12 near the distal end.

[0071] Optional, such as Figure 3 As shown, the flexible element 21 has a variable-diameter spiral structure. The outer diameter of the flexible element 21 gradually increases from the proximal end to the distal end and then gradually decreases to its original outer diameter. The outer diameters at both ends of the flexible element 21 are the same as the outer diameter of the first sub-stent 11. The wire diameter of the flexible element 21 is the same as the wire diameter of the braided wire 13 that forms the first sub-stent 11. The distal end of the flexible element 21 is connected to the proximal end of the first sub-stent 11, and the proximal end of the flexible element 21 is connected to the distal end of the second sub-stent 12. By setting the structure of the flexible element 21 to a variable-diameter spiral, with the outer diameter being largest in the middle, when the endovascular stent of this technical solution is implanted into the blood vessel, the middle part of the flexible element 21 can seal the neck of the aneurysm, preventing the coil from slipping out of the aneurysm cavity.

[0072] Optional, such as Figure 2 , Figure 3 As shown, based on either of the two optional technical solutions mentioned above, the endovascular stent further includes a third flexible filament 28 with a helical or variable-diameter helical structure, which is sleeved on the flexible member 21. The helical direction of the third flexible filament 28 is opposite to that of the flexible member 21; for example, if the helical direction of the flexible member 21 is left-handed, then the helical direction of the third flexible filament 28 is right-handed. In this technical solution, sleeved with the third flexible filament 28 on the flexible member 21, the double-layer structure not only improves the compliance of the endovascular stent, but also makes it easier for the endovascular stent in this technical solution to conform to the inner wall of the blood vessel in tortuous blood vessels with a small bending radius.

[0073] Optional, such as Figure 3 As shown, the difference from any of the three optional technical solutions mentioned above is that there are multiple flexible members 21, which are arranged sequentially and at intervals along the axis of the first sub-support 11, with gaps between adjacent flexible members 21. All the flexible members 21 are arranged coaxially with the first sub-support 11. This arrangement can further increase the metal coverage between the first sub-support and the second sub-support.

[0074] You may choose any one of the four technical solutions mentioned above.

[0075] The exemplary usage process of the endovascular stent disclosed in this embodiment is as follows:

[0076] like Figures 1 to 3 As shown, the operator first releases the first sub-stent 11 within the blood vessel, ensuring it adheres to the vessel wall with its proximal end positioned near the aneurysm neck. Next, a spiral-shaped flexible element 21 is released within the vessel. When the operator moves the second sub-stent 12 closer to the first sub-stent 11, the first sub-stent 11 limits the movement of the flexible element 21. The interaction between the first and second sub-stents compresses the flexible element 21, placing it in a compressed state. As the second sub-stent 12 moves closer to the first sub-stent 11, the flexible element 21 undergoes elastic deformation, gradually reducing its gaps and increasing its metal coverage. The metal coverage of the flexible element 21 reaches its maximum when the gaps disappear completely. Of course, the operator can also move the second sub-stent 12 away from the first sub-stent 11. The first sub-stent 11 limits the flexible element 21. Through the cooperation of the first sub-stent 11 and the second sub-stent 12, the flexible element 21 is stretched, so that the stretched flexible element 21 is in a non-compressed state. As the second sub-stent 12 moves away from the first sub-stent 11, the flexible element 21 undergoes elastic deformation, the gap of the flexible element 21 gradually increases, and the metal coverage of the flexible element 21 gradually decreases. The operator can adjust the distance between the first and second sub-stents to induce elastic deformation of the flexible element 21 and achieve the purpose of adjusting the metal coverage between the first and second sub-stents. After the operator has completed the adjustment of the metal coverage between the first and second sub-stents, the operator finally releases the second sub-stent 12 into the blood vessel, so that the second sub-stent 12 adheres to the inner wall of the blood vessel, and the compressed flexible element 21 is located at the neck of the aneurysm. The first sub-stent 11 and the second sub-stent 12, released into the blood vessel, serve to fix the flexible member 21.

[0077] In this embodiment, by moving the second sub-stent 12 closer to the first sub-stent 11 or moving the second sub-stent 12 away from the first sub-stent 11, the cooperation of the first sub-stent 11 and the second sub-stent 12 compresses or stretches the flexible member 21, causing elastic deformation of the flexible member 21 and changing the size of the gap in the flexible member 21. This achieves the purpose of adjusting the metal coverage of the flexible member 21, and also adjusts the metal coverage between the first and second sub-stents. Compared with the prior art, this embodiment has a larger adjustment range for the metal coverage between the first and second sub-stents, and adjusting the metal coverage does not affect the outer diameter of the first and second sub-stents, resulting in better adhesion of the first and second sub-stents to the inner wall of the blood vessel. It also further enhances the support of the coils located in the aneurysm cavity. The synergistic cooperation between the metal coverage between the first and second sub-stents and the coils located in the aneurysm cavity improves the sealing effect of the flexible member on the aneurysm neck, increasing the embolization rate of the aneurysm cavity.

[0078] Second Embodiment

[0079] This embodiment also proposes an intravascular stent. The second embodiment differs from the first embodiment in the structure of the flexible component. The flexible component includes a first flexible wire 22, and the specific arrangement of the first flexible wire 22 is as follows:

[0080] Optional, such as Figure 4 , Figure 5 As shown, the flexible component includes multiple first flexible filaments 22, each with a straight filament structure, evenly distributed around the axis of the first sub-stent 11. One end of each first flexible filament 22 is connected to the proximal end of the first sub-stent 11, and the other end is connected to the distal end of the second sub-stent 12. When the endovascular stent of this technical solution is implanted into a blood vessel, the second sub-stent 12 moves toward the first sub-stent 11. As the distance between the second sub-stent 12 and the first sub-stent 11 decreases, all the first flexible filaments 22 undergo elastic deformation. When the proximal end of the first sub-stent 11 contacts the distal end of the second sub-stent 12, the first flexible filament 22 reaches its maximum elastic deformation value and stops elastically deforming. The middle part of the first flexible filament 22 is positioned close to the axis of the first sub-stent 11, i.e., as shown in the diagram. Figure 5 As shown. This arrangement can increase the metal coverage between the second sub-support 12 and the first sub-support 11, and also provide support for the connection between the second sub-support 12 and the first sub-support 11.

[0081] Optional, such as Figure 6 , Figure 7As shown, the difference from the above technical solution lies in that the inner diameter of the first sub-stent 11 is larger than the outer diameter of the second sub-stent 12. When the endovascular stent is implanted into the blood vessel, the second sub-stent 12 moves toward the first sub-stent 11. As the distance between the second sub-stent 12 and the first sub-stent 11 decreases, multiple first flexible wires 22 undergo elastic deformation. During the elastic deformation process, the first flexible wires 22 gradually transform into a ring structure. When the distal end of the second sub-stent 12 enters the first sub-stent 11, and the distal end of the second sub-stent 12 is located at the proximal end of the first sub-stent 11, the first flexible wires 22 stop elastic deformation, and the first flexible wires 22 form a ring structure. Multiple first flexible wires 22 are arranged sequentially along the axis of the first sub-stent 11. The ring-shaped first flexible wires 22 are located between the first sub-stent 11 and the second sub-stent 12, i.e. Figure 7 As shown. This three-layer structure can not only increase the metal coverage between the second sub-stent 12 and the first sub-stent 11, but also support the first sub-stent 11 through the first flexible wire 22, further improving the fit of the first sub-stent 11 and the second sub-stent 12 to the vascular wall.

[0082] Optional, such as Figure 8 As shown, the flexible component includes multiple first flexible wires 22, each with a helical structure, and these wires are evenly distributed around the axis of the first sub-stent 11. One end of each first flexible wire 22 is connected to the proximal end of the first sub-stent 11, and the other end is connected to the distal end of the second sub-stent 12. The exemplary use of the endovascular stent of this technical solution is the same as the exemplary use of the endovascular stent of the first embodiment.

[0083] Optional, such as Figure 8 , Figure 9 As shown, the difference from the above technical solution is that the inner diameter of the first sub-stent 11 is larger than the outer diameter of the second sub-stent 12. When the intravascular stent is implanted into the blood vessel, the second sub-stent 12 moves toward the first sub-stent 11. As the distance between the second sub-stent 12 and the first sub-stent 11 decreases, multiple first flexible wires 22 undergo elastic deformation. When the distal end of the second sub-stent 12 enters the first sub-stent 11, and the distal end of the second sub-stent 12 is located at the proximal end of the first sub-stent 11, the first flexible wires 22 are located between the first sub-stent 11 and the second sub-stent 12, i.e. Figure 9As shown. If the first flexible filament 22, which has a spiral structure, overlaps completely or partially, it can increase the metal coverage between the second sub-stent 12 and the first sub-stent 11, facilitating aneurysm embolization. If the first flexible filament 22, which has a spiral structure, does not overlap at all, it can reduce the bending stress on the endovascular stent in tortuous vessels, improve the compliance of the endovascular stent, and enhance the adhesion of the first sub-stent 11 and the second sub-stent 12 to the vascular wall.

[0084] Optional, such as Figure 9 , Figure 10 As shown, the difference from the above technical solution lies in that the flexible component includes multiple first flexible wires 22, all of which are variable-diameter spiral structures. The outer diameter of each first flexible wire 22 gradually increases from the proximal end towards the distal end and then gradually decreases back to its original outer diameter. When the endovascular stent is implanted into the blood vessel, the second sub-stent 12 moves towards the first sub-stent 11. As the distance between the second sub-stent 12 and the first sub-stent 11 decreases, all the first flexible wires 22 undergo elastic deformation. When the distal end of the second sub-stent 12 enters the first sub-stent 11, and the distal end of the second sub-stent 12 is located at the proximal end of the first sub-stent 11, the first flexible wires 22 are located between the first sub-stent 11 and the second sub-stent 12, i.e. Figure 9 As shown. If the first flexible filament 22 with a spiral structure has complete or partial overlap, the first flexible filament 22 with a variable diameter spiral structure can further increase the supporting force on the first sub-stent 11, and further improve the adhesion effect of the first sub-stent 11 to the inner wall of the blood vessel.

[0085] Optional, such as Figure 11 , Figure 12As shown, the flexible component includes multiple first flexible wires 22, which are evenly distributed around the axis of the first sub-stent 11. Since the structures of the multiple first flexible wires 22 are all identical, one of them is used as an example. One end of the first flexible wire 22 is connected to the proximal end of the first sub-stent 11, and a ring-shaped deformation segment 23 is wound around the middle of the first flexible wire 22 clockwise or counterclockwise. The other end of the first flexible wire 22 is connected to the distal end of the second sub-stent 12. When the intravascular stent is implanted into the blood vessel, the second sub-stent 12 moves toward the first sub-stent 11. As the distance between the second sub-stent 12 and the first sub-stent 11 decreases, all the first flexible wires 22 undergo elastic deformation. When the distal end of the second sub-stent 12 contacts the proximal end of the first sub-stent 11, the deformable segment 23 of the first flexible wire 22 is located outside the first sub-stent 11 or the second sub-stent 12. The deformable segment 23 of the first flexible wire 22 undergoes elastic deformation in a direction away from the axis of the first sub-stent 11, and the deformable segment 23 enters the aneurysm cavity through the aneurysm neck and compresses the spring coil located in the aneurysm cavity. The synergistic cooperation between the deformable segment 23 of the first flexible wire 22 and the spring coil located in the aneurysm cavity can improve the embolization effect of the aneurysm.

[0086] Optionally, based on the above technical solutions, such as Figure 11 , Figure 13 As shown, one end of the first flexible wire 22 is connected to the proximal end of the first sub-stent 11. Multiple annular deformation segments 23 are wound clockwise or counterclockwise around the middle of the first flexible wire 22. The other end of the first flexible wire 22 is connected to the distal end of the second sub-stent 12. In this technical solution, the multiple deformation segments 23 are wound in the same direction, either clockwise or counterclockwise. By setting multiple deformation segments with the same winding direction on the first flexible wire 22, and by simultaneously compressing the spring coil located within the aneurysm cavity through these multiple deformation segments, the compression effect of the deformation segments on the spring coil is improved, further increasing the metal coverage between the second sub-stent 12 and the first sub-stent 11, thus improving the embolization effect of the aneurysm.

[0087] Alternatively, the difference from the above technical solutions lies in, for example... Figure 11 , Figure 14As shown, one end of the first flexible wire 22 is connected to the proximal end of the first sub-stent 11. The middle of the first flexible wire 22 has two deformation segments 23. Specifically, the middle of the first flexible wire 22 is first wound clockwise to form a loop-shaped deformation segment 23, and then the middle of the first flexible wire 22 is wound counterclockwise to form another loop-shaped deformation segment 23. Finally, the other end of the first flexible wire 22 is connected to the distal end of the second sub-stent 12. By setting multiple deformation segments with different winding directions on the first flexible wire 22, and through the synergistic cooperation of the counterclockwise and clockwise winding deformation segments, the compression effect of the deformation segments on the spring coil is further improved, increasing the metal coverage between the second sub-stent 12 and the first sub-stent 11, and improving the embolization effect of the aneurysm.

[0088] Alternatively, the difference from the above technical solutions lies in, for example... Figure 11 , Figure 15 As shown, one end of the first flexible wire 22 is connected to the proximal end of the first sub-stent 11. The middle of the first flexible wire 22 has three deformation segments 23. Specifically, the middle of the first flexible wire 22 is first wound clockwise to form a loop deformation segment 23, then the middle of the first flexible wire 22 is wound counterclockwise to form another loop deformation segment 23, then the middle of the first flexible wire 22 is wound clockwise to form yet another loop deformation segment 23, and finally the other end of the first flexible wire 22 is connected to the distal end of the second sub-stent 12. By placing a counterclockwise deformation segment between two clockwise deformation segments, the counterclockwise deformation segment simultaneously applies a counter-force to the two clockwise deformation segments, thereby further improving the compression effect of the deformation segment on the spring coil and further improving the embolization effect of the aneurysm.

[0089] You may choose any one of the nine optional technical solutions mentioned above.

[0090] Third Embodiment

[0091] This embodiment also proposes an intravascular stent. The third embodiment is a further improvement upon the second embodiment. The difference between the third and second embodiments lies in the structure of the flexible component, which includes a first flexible wire 22 and a second flexible wire 24, specifically configured as follows:

[0092] Optional, such as Figure 16 , Figure 17As shown, the flexible component includes multiple first flexible filaments 22 and multiple second flexible filaments 24. All first flexible filaments 22 have a spiral structure, and all second flexible filaments 24 are either straight or wavy. The number of first flexible filaments 22 is the same as the number of second flexible filaments 24, and the multiple first flexible filaments 22 and multiple second flexible filaments 24 are symmetrically arranged. Specifically, the multiple first flexible filaments 22 are located on one side of the axis of the first sub-support 11 and are evenly distributed around the axis of the first sub-support 11. The multiple second flexible filaments 24 are located on the other side of the axis of the first sub-support 11 and are evenly distributed around the axis of the first sub-support 11.

[0093] Optional, such as Figure 16 , Figure 17 As shown, the flexible component includes multiple first flexible filaments 22 and multiple second flexible filaments 24. The multiple first flexible filaments 22 are all in a variable-diameter spiral structure, and the multiple second flexible filaments 24 are all straight or wavy filaments. Specifically, the outer diameter of the first flexible filaments 22 gradually increases from the proximal end towards the distal end and then gradually decreases back to the original outer diameter of the first flexible filament 22. The number of first flexible filaments 22 is greater than the number of second flexible filaments 24, and the multiple first flexible filaments 22 and the multiple second flexible filaments 24 are evenly distributed around the axis of the first sub-support 11.

[0094] Optional, such as Figure 16 , Figure 18 As shown, the flexible component includes multiple first flexible filaments 22 and multiple second flexible filaments 24. Since the structures of the multiple first flexible filaments 22 are all identical, one of the first flexible filaments 22 will be used as an example for description. A shaping segment 23 is wound clockwise or counterclockwise around the middle of the first flexible filament 22. The shaping segment 23 is ring-shaped, and there are one or more shaping segments 23. The multiple second flexible filaments 24 are all straight or wavy filaments. Specifically, the number of first flexible filaments 22 is less than the number of second flexible filaments 24, or the number of first flexible filaments 22 is more than the number of second flexible filaments 24. The multiple first flexible filaments 22 and the multiple second flexible filaments 24 are evenly distributed around the axis of the first sub-support 11.

[0095] Optionally, not shown in the figure, the difference from the above three technical solutions is that the number of first flexible wires 22 is the same as the number of second flexible wires 24. Multiple first flexible wires 22 and multiple second flexible wires 24 are evenly arranged around the axis of the first sub-support 11, and the two wires on both sides of the first flexible wire 22 are both second flexible wires 24, that is, multiple first flexible wires 22 and multiple second flexible wires 24 are alternately arranged.

[0096] You may choose any one of the four technical solutions mentioned above.

[0097] The exemplary usage process of the endovascular stent disclosed in this embodiment is as follows:

[0098] like Figures 16 to 19 As shown, the operator first releases the first sub-stent 11 within the blood vessel, allowing it to adhere to the vessel wall, with the proximal end of the first sub-stent 11 positioned on one side of the aneurysm neck. Then, the first flexible wire 22 and the second flexible wire 24 are released within the blood vessel. Because the inner diameter of the first sub-stent 11 in its released state is larger than the outer diameter of the second sub-stent 12 in its unreleased state, the operator moves the second sub-stent 12 closer to the first sub-stent 11. As the distance between the second sub-stent 12 and the first sub-stent 11 decreases, multiple first flexible wires 22 and multiple second flexible wires 24 undergo elastic deformation. When the distal end of the second sub-stent 12 enters the first sub-stent 11, the operator releases the second sub-stent 12 within the blood vessel, allowing it to adhere to the vessel wall. The compressed second flexible wire 24 is positioned between the first and second sub-stents, improving metal coverage and enhancing adhesion to the vessel wall. The compressed first flexible wire 22 enters the aneurysm cavity, supporting and compressing the coils within, thus improving the embolization effect. It can also replace some coils, reducing the amount of coils used and lowering the recurrence rate of the aneurysm after treatment.

[0099] Fourth embodiment

[0100] This embodiment also proposes an intravascular stent. The fourth embodiment differs from the third embodiment in the structure of the flexible component. The flexible component includes a first flexible wire 22 and a second flexible wire 24, specifically configured as follows:

[0101] Optional, such as Figure 20 As shown, the flexible component includes multiple first flexible wires 22 and multiple second flexible wires 24. All first flexible wires 22 are straight and are evenly distributed around the axis of the first sub-support 11. All second flexible wires 24 have a spiral structure, and the number of second flexible wires 24 is the same as the number of first flexible wires 22. Therefore, in this technical solution, one second flexible wire 24 is sleeved on one first flexible wire 22, and the two ends of the second flexible wire 24 are fixedly connected to the two ends of the first flexible wire 22.

[0102] Optionally, not shown in the figure, the difference from the above technical solution is that the number of second flexible wires 24 is less than the number of first flexible wires 22. Therefore, in this technical solution, one second flexible wire 24 is sleeved on one first flexible wire 22, and the two ends of the second flexible wire 24 are fixedly connected to the two ends of the first flexible wire 22 respectively. Multiple second flexible wires 24 are located on one side of the axis of the first sub-support 11, and the multiple second flexible wires 24 are evenly distributed around the axis of the first sub-support 11.

[0103] Optional, such as Figure 20 , Figure 21 As shown, the flexible component includes multiple first flexible wires 22 and multiple second flexible wires 24. All first flexible wires 22 are straight and are evenly distributed around the axis of the first sub-support 11. The multiple second flexible wires 24 have a variable-diameter spiral structure. Specifically, the outer diameter of each second flexible wire 24 gradually increases and then gradually decreases to its original outer diameter from the proximal end towards the distal end. The number of second flexible wires 24 is the same as the number of first flexible wires 22. Therefore, in this technical solution, one second flexible wire 24 is sleeved on one first flexible wire 22, and both ends of the second flexible wire 24 are fixedly connected to both ends of the first flexible wire 22.

[0104] You may choose any one of the three technical solutions mentioned above.

[0105] Compared with the prior art, in this embodiment, a second flexible filament 24, which has a spiral or variable-diameter spiral structure, is sleeved on the first flexible filament 22 located between the first sub-stent 11 and the second sub-stent 12. When the intravascular stent is implanted into the blood vessel, the second sub-stent 12 moves toward the first sub-stent 11. As the distance between the second sub-stent 12 and the first sub-stent 11 decreases, multiple first flexible filaments 22 and multiple second flexible filaments 24 undergo elastic deformation. When the distal end of the second sub-stent 12 enters the first sub-stent 11, the first flexible filaments 22 and the second flexible filaments 24, which are in a compressed state, are located between the first sub-stent 11 and the second sub-stent 12. This can improve the metal coverage between the first and second sub-stents, resulting in better adhesion of the first and second sub-stents to the inner wall of the blood vessel. It can also improve the stability of the intravascular stent after deployment and reduce the risk of displacement of the first and second sub-stents.

[0106] Fifth embodiment

[0107] This embodiment also proposes an intravascular stent. The difference between the fifth embodiment and the second embodiment lies in the structure of the flexible component. The flexible component includes multiple first flexible wires 22, specifically configured as follows:

[0108] like Figure 22 , Figure 23 As shown, the flexible component includes multiple first flexible wires 22, which are evenly distributed around the axis of the first sub-support 11. Since the multiple first flexible wires 22 have the same structure, one first flexible wire 22 is used as an example. The first flexible wire 22 includes a first connecting segment 25, a second connecting segment 26, and a deformation segment 23. The first connecting segment 25 and the second connecting segment 26 are coaxially aligned, and the deformation segment 23 is located between the first connecting segment 25 and the second connecting segment 26. The deformation segment 23 includes multiple flexible sub-wires 27, which have the same structure. The middle part of each flexible sub-wire 27 protrudes away from the axis of the first connecting segment 25, making each flexible sub-wire 27 an arc-shaped wire. The multiple flexible sub-wires 27 are evenly distributed around the axis of the first connecting segment 25, which can be considered as multiple arc-shaped flexible sub-wires 27 evenly distributed around the axis of the first flexible wire 22. One end of a plurality of flexible sub-filaments 27 near the distal end is connected to one end of the first connecting segment 25, the other end of the first connecting segment 25 is connected to one end of the first sub-support 11 near the proximal end, one end of a plurality of flexible sub-filaments 27 near the proximal end is connected to one end of the second connecting segment 26, and the other end of the second connecting segment 26 is connected to one end of the second sub-support 12 near the distal end.

[0109] Compared with the prior art, in this embodiment, the deformation segment 23 of the first flexible filament 22 is composed of multiple flexible sub-filaments 27. When the intravascular stent is implanted into the blood vessel, the second sub-stent 12 moves towards the first sub-stent 11. As the distance between the second sub-stent 12 and the first sub-stent 11 decreases, all the first flexible filaments 22 undergo elastic deformation, and the multiple flexible sub-filaments 27 of the first flexible filament 22 also undergo elastic deformation. When the distal end of the second sub-stent 12 enters the first sub-stent 11, the first flexible filament 22, which is in a compressed state, is located between the first sub-stent 11 and the second sub-stent 12. The multiple flexible sub-filaments 27 can provide multi-point support for the first sub-stent 11, which can improve the metal coverage between the first and second sub-stents, further improve the stability of the intravascular stent after deployment, and reduce the risk of displacement of the first and second sub-stents.

[0110] Sixth Embodiment

[0111] This embodiment also proposes an intravascular stent. The difference between the sixth and fifth embodiments lies in the structure of the flexible component. The flexible component includes multiple first flexible wires 22, specifically configured as follows:

[0112] like Figure 24 , Figure 25As shown, the flexible component includes multiple first flexible filaments 22, which are evenly distributed around the axis of the first sub-support 11. Since the multiple first flexible filaments 22 have the same structure, one first flexible filament 22 will be used as an example. The first flexible filament 22 includes a first connecting segment 25, a second connecting segment 26, and a deformation segment 23. The first connecting segment 25 and the second connecting segment 26 are coaxially aligned, and the deformation segment 23 is located between the first connecting segment 25 and the second connecting segment 26. The deformation segment 23 includes multiple flexible sub-filaments 27, which have the same structure and are spiral-shaped. The multiple flexible sub-filaments 27 are evenly distributed around the axis of the first connecting segment 25, which can be considered as a twisted structure for the deformation segment 23. One end of a plurality of flexible sub-filaments 27 near the distal end is connected to one end of the first connecting segment 25, the other end of the first connecting segment 25 is connected to one end of the first sub-support 11 near the proximal end, one end of a plurality of flexible sub-filaments 27 near the proximal end is connected to one end of the second connecting segment 26, and the other end of the second connecting segment 26 is connected to one end of the second sub-support 12 near the distal end.

[0113] Compared with the prior art, in this embodiment, multiple flexible sub-filaments 27 form a twisted structure deformation segment. When the intravascular stent is implanted into the blood vessel, the second sub-stent 12 moves towards the first sub-stent 11. As the distance between the second sub-stent 12 and the first sub-stent 11 decreases, multiple first flexible filaments 22 undergo elastic deformation, and the multiple flexible sub-filaments 27 of the first flexible filaments 22 also undergo elastic deformation. When the distal end of the second sub-stent 12 enters the first sub-stent 11, the first flexible filaments 22, which are in a compressed state, are located between the first sub-stent 11 and the second sub-stent 12. The twisted structure deformation segment provides stronger support to the first sub-stent 11, further improving the stability of the intravascular stent after deployment.

[0114] Seventh Embodiment

[0115] This embodiment also proposes an intravascular stent. The difference between the seventh embodiment and the third embodiment lies in the structure of the flexible component. The flexible component includes a first flexible wire 22 and a second flexible wire 24, specifically configured as follows:

[0116] Optional, such as Figure 26As shown, the flexible component includes multiple first flexible filaments 22 and one second flexible filament 24. The multiple first flexible filaments 22 are either straight or wavy, and are evenly distributed around the axis of the first sub-stent 11. The second flexible filament 24 has a helical structure and is fitted within the multiple first flexible filaments 22; that is, the multiple first flexible filaments 22 are all located within the helical second flexible filament 24. In this technical solution, fitting the helical second flexible filament 24 within the multiple first flexible filaments 22, through a double-layer structure, improves the compliance of the endovascular stent, making it easier for the endovascular stent in this technical solution to conform to the vascular wall in tortuous vessels with small bending radii.

[0117] Optional, such as Figure 27 As shown, based on the above technical solution, the flexible component further includes a third flexible filament 28. The third flexible filament 28 has a helical structure and is sleeved on the second flexible filament 24, i.e., the second flexible filament 24 is located between the third flexible filament 28 and multiple first flexible filaments 22. The helical direction of the third flexible filament 28 is opposite to the helical direction of the second flexible filament 24. For example, if the helical direction of the second flexible filament 24 is left-handed, then the helical direction of the third flexible filament 28 is right-handed. In this technical solution, the helical second flexible filament 24 is sleeved on multiple first flexible filaments 22, and the helical third flexible filament 28 is sleeved on the second flexible filament 24. This three-layer structure not only improves the compliance of the endovascular stent, making it easier for the endovascular stent in this technical solution to conform to the inner wall of the blood vessel in tortuous blood vessels with small bending radii, but also improves the stability of the endovascular stent in the blood vessel and increases the metal coverage between the first and second sub-stents.

[0118] Optional, such as Figure 28 As shown, the flexible component includes multiple first flexible wires 22 and one second flexible wire 24. The multiple first flexible wires 22 are either straight or wavy, and are evenly distributed around the axis of the first sub-stent 11. The second flexible wire 24 has a variable-diameter spiral structure. The outer diameter of the second flexible wire 24 gradually increases from the proximal end towards the distal end and then gradually decreases to its original outer diameter. The second flexible wire 24 is fitted within the multiple first flexible wires 22, meaning that the multiple first flexible wires 22 are all located within the spiral-shaped second flexible wire 24. In this technical solution, fitting the variable-diameter spiral-shaped second flexible wire 24 within the multiple first flexible wires 22, through a double-layer structure, can improve the compliance of the endovascular stent. In scenarios involving tortuous blood vessels with small bending radii, this results in better adhesion of the endovascular stent to the vessel wall.

[0119] Optional, such as Figure 27 , Figure 28As shown, based on the above technical solution, the flexible component also includes a third flexible filament 28. The third flexible filament 28 has a variable-diameter helical structure. The outer diameter of the third flexible filament 28 gradually increases from the proximal end to the distal end and then gradually decreases to its original outer diameter. The third flexible filament 28 is sleeved on the second flexible filament 24, that is, the second flexible filament 24 is located between the third flexible filament 28 and multiple first flexible filaments 22. The helical direction of the third flexible filament 28 is opposite to that of the second flexible filament 24. Specifically, if the helical direction of the second flexible filament 24 is left-handed, then the helical direction of the third flexible filament 28 is right-handed. In this technical solution, the second flexible filament 24 with a variable-diameter helical structure is sleeved on multiple first flexible filaments 22, and the third flexible filament 28 with a variable-diameter helical structure is sleeved on the second flexible filament 24. This three-layer structure not only improves the compliance of the vascular stent, but also makes the vascular stent adhere better to the inner wall of the blood vessel in scenarios with tortuous blood vessels with small bending radii. It can also improve the stability of intravascular stents within blood vessels and increase the metal coverage between the first and second sub-stents.

[0120] You may choose any one of the four technical solutions mentioned above.

[0121] Eighth embodiment

[0122] This embodiment also proposes an intravascular stent. The eighth embodiment is a further improvement based on any one of the first to seventh embodiments, with the main improvement being in the first sub-stent 11, as detailed below:

[0123] Optional, such as Figure 8 , Figure 9 , Figure 29 As shown, the first sub-support 11 has a variable diameter portion 14 at one end near the second sub-support 12. The outer diameter of one end of the variable diameter portion 14 is the same as the outer diameter of the first sub-support 11, and the outer diameter of the variable diameter portion 14 gradually increases from the distal end towards the proximal end. Preferably, the outer diameter of the variable diameter portion 14 gradually increases from the distal end towards the proximal end to 1.01 to 4 times the outer diameter of the first sub-support 11. When the second sub-support 12 moves toward the first sub-support 11, and the distal end of the second sub-support 12 enters the variable diameter portion 14 of the first sub-support, a receiving interlayer is formed between the distal end of the second sub-support 12 and the variable diameter portion 14 of the first sub-support 11. The second sub-support 12 drives the flexible component to undergo elastic deformation, causing the flexible component to be in a compressed state, and the entire flexible component is located within the receiving interlayer. For example, the flexible component includes multiple first flexible wires 22, and all the compressed first flexible wires 22 are located within the receiving interlayer.

[0124] Optional, such as Figure 19 , Figure 29 , Figure 30 As shown, the difference from the above technical solution lies in that, when the second sub-stent 12 moves toward the first sub-stent 11, and the distal end of the second sub-stent 12 enters the diameter-reducing portion 14 of the first sub-stent, a receiving interlayer is formed between the distal end of the second sub-stent 12 and the diameter-reducing portion 14 of the first sub-stent 11. The second sub-stent 12 drives the flexible component to undergo elastic deformation. A portion of the flexible component is located within the receiving interlayer and is in a compressed state, while another portion of the flexible component is located outside the receiving interlayer and enters the aneurysm cavity. Meanwhile, a portion of the diameter-reducing portion 14 of the first sub-stent enters the aneurysm and cooperates with the flexible component to support the spring coil, while the remaining portion of the diameter-reducing portion 14 undergoes elastic deformation as it adheres to the inner wall of the blood vessel. For example, the flexible component includes multiple first flexible wires 22 and multiple second flexible wires 24. The second flexible wires 24 in a compressed state are all located within the receiving interlayer, and the first flexible wires 22 enter the aneurysm cavity and support the spring coil.

[0125] Optional, such as Figures 29 to 31 As shown, the difference in the above technical solution lies in that the aneurysm is located at the bifurcation of the blood vessel. The first sub-stent 11 is implanted into the blood vessel, and the first sub-stent 11 is positioned closer to the distal end. The variable diameter portion 14 can adapt to the structure at the bifurcation of the blood vessel, further increasing the stability of the first sub-stent 11 within the blood vessel. A portion of the variable diameter portion 14 obstructs the aneurysm neck, which further reduces the size of the aneurysm neck and also supports the coils located within the aneurysm. Preferably, the portion of the variable diameter portion 14 that obstructs the aneurysm neck occupies half of the aneurysm neck. When the second sub-stent 12 moves toward the first sub-stent 11, and the distal end of the second sub-stent 12 enters the variable diameter portion 14 of the first sub-stent, a receiving interlayer is formed between the distal end of the second sub-stent 12 and the variable diameter portion 14 of the first sub-stent 11. The second sub-stent 12 drives the flexible component to undergo elastic deformation. A portion of the flexible component is located within the receiving dissection and is in a compressed state, while another portion of the flexible component is located outside the receiving dissection and enters the aneurysm cavity, thus completing the implantation of the endovascular stent. For example, the flexible component includes multiple first flexible wires 22 and multiple second flexible wires 24. The compressed second flexible wires 24 are all located between the first sub-stent 11 and the second sub-stent 12 to increase the metal coverage. The first flexible wires 22 enter the aneurysm cavity and work in conjunction with the variable diameter section 14 to support the coils located within the aneurysm.

[0126] You may choose any one of the three technical solutions mentioned above.

[0127] In the eight embodiments of the present invention, in order to facilitate further explanation of the technical solution, all eight embodiments are described with the state of no intravascular stent implanted in the blood vessel.

[0128] If the endovascular stents in the eight embodiments are all described as being implanted in a blood vessel, then the first sub-stent 11 is positioned near the distal end, while the second sub-stent 12 is positioned near the proximal end. Since the diameter of the blood vessel near the proximal end is larger than that of the blood vessel near the distal end, and the blood vessel constrains the endovascular stent, the outer diameter of the second sub-stent 12 released into the blood vessel is larger than the outer diameter of the first sub-stent 11 released into the blood vessel.

[0129] Finally, it should be noted that those skilled in the art will understand that many technical details have been presented in the embodiments of the present invention to facilitate a better understanding of the invention. However, even without these technical details and various variations and modifications based on the above embodiments, the technical solutions claimed in the claims of the present invention can be substantially achieved. Therefore, in practical applications, various changes in form and detail can be made to the above embodiments without departing from the spirit and scope of the present invention.

Claims

1. An endovascular stent, characterized in that, include: Both the first sub-support and the second sub-support are woven from multiple braided filaments into a mesh-like structure; the first sub-support and the second sub-support are arranged coaxially. A flexible component includes multiple first flexible filaments, each of which has at least one deformable segment wound in a clockwise or counterclockwise loop at its center. Multiple first flexible wires are evenly distributed around the axis of the first sub-support, with gaps between adjacent first flexible wires; one end of the first flexible wire is connected to the proximal end of the first sub-support, and the other end of the first flexible wire is connected to the distal end of the second sub-support. By adjusting the distance between the first sub-support and the second sub-support, the flexible component undergoes elastic deformation, and the metal coverage between the first sub-support and the second sub-support is adjusted.

2. The endovascular stent according to claim 1, characterized in that, The first flexible wire has multiple deformation segments in the middle; all of the multiple deformation segments are wound clockwise or counterclockwise.

3. The endovascular stent according to claim 1, characterized in that, The first flexible filament has multiple deformation sections in the middle; some deformation sections are wound clockwise, and others are wound counterclockwise.

4. The endovascular stent according to claim 1, characterized in that, The plurality of first flexible wires are located on one side of the axis of the first sub-support; the flexible assembly further includes: Multiple second flexible filaments, each with a straight or wavy structure, are evenly distributed around the axis of the first sub-support and located on the other side of the axis of the first sub-support.

5. The endovascular stent according to claim 1, characterized in that, The outer diameter of the end of the first sub-stent closest to the second sub-stent gradually increases from the direction of the distal end to the direction of the proximal end; when the second sub-stent moves toward the first sub-stent and one end of the second sub-stent is located inside the first sub-stent, an accommodating interlayer is formed between the first sub-stent and the second sub-stent. The entire flexible component is located within the receiving interlayer; or a portion of the flexible component is located within the receiving interlayer, while another portion of the flexible component is located outside the receiving interlayer and enters the aneurysm cavity.

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