Intravascular stent

Abstract

The invention particularly relates to an intravascular stent which comprises a first sub-stent and a second sub-stent which are each of a mesh tubular structure formed by weaving a plurality of weaving wires. The first sub-bracket and the second sub-bracket are coaxially arranged; the flexible assembly comprises a plurality of first flexible wires and a plurality of second flexible wires; the plurality of first flexible wires are of spiral structures; the plurality of second flexible wires are of straight wire or wave wire structures; a gap is formed between every two adjacent first flexible filaments, and a gap is formed between every two adjacent second flexible filaments; the first sub-stent is connected with the second sub-stent through the first flexible wire and the second flexible wire; the plurality of first flexible wires and the plurality of second flexible wires are uniformly distributed around the axis of the first sub-stent; by adjusting the distance between the first sub-support and the second sub-support, the flexible assembly is elastically deformed, and the metal coverage rate between the first sub-support and the second sub-support is adjusted.

Description

[0001] The present application is a divisional application of the application with the application number 202511102810.2, the application name of a vascular stent, and the filing date of August 7, 2025. TECHNICAL FIELD

[0002] The present application relates to the technical field of intravascular stents, in particular to an intravascular stent. BACKGROUND

[0003] Intracranial aneurysm is a common cerebrovascular disease. Rupture of an aneurysm can cause severe neurological dysfunction and even death. Clinically, spring coil embolization is usually used to treat aneurysms. For complex aneurysms, simple spring coil embolization has limitations, such as the spring coil easily sliding out of the aneurysm, or the embolization is not dense, thereby causing the aneurysm to recur. In order to solve the above problem, a stent-assisted spring coil embolization is usually used. This technology implants a stent in the parent vessel to provide mechanical support for the spring coil located in the aneurysm cavity, effectively improving the embolization stability of the spring coil, and is also suitable for complex types of aneurysms located at the vascular bifurcation.

[0004] Although stent-assisted spring coil embolization can treat complex aneurysms, the main function of the existing stent is to provide simple support for the spring coil, and the spring coil can still have slight displacement in the later stage, or the occlusion is not dense, which can cause the aneurysm to have a risk of recurrence. If a high metal coverage method is used, it is often beneficial to promote the healing of the aneurysm. The existing braided stent can reduce the mesh area by extrusion to increase the metal coverage at the aneurysm neck, but it can form a fusiform structure at the aneurysm neck as shown in Figure 1 Although the metal coverage at the aneurysm neck can be increased, the part of the stent outside the aneurysm neck cannot be closely attached to the inner wall of the blood vessel, which can easily cause the risk of intravascular stenosis and the risk of thrombosis. For aneurysms located at the vascular bifurcation, the Y-shaped stent technology uses two stents to overlap. This stent is complex to operate and cannot be effectively promoted, and it also easily causes the risk of intravascular stenosis and the risk of thrombosis. SUMMARY

[0005] In order to solve or at least partially solve the above technical problems, the present application provides an intravascular stent.

[0006] The application provides an intravascular stent, which comprises a first sub-stent, a second sub-stent and a flexible component, the first sub-stent is woven into a tubular structure by a plurality of woven wires, the second sub-stent is woven into a tubular structure by a plurality of woven wires, the first sub-stent and the second sub-stent 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, the flexible component is in a spiral or variable-diameter spiral structure, when the flexible component is in the variable-diameter spiral structure, the outer diameter of the flexible component gradually increases first and then gradually decreases from the direction of the proximal end to the direction of the distal end, and the distance between the first sub-stent and the second sub-stent is adjusted to make the flexible component elastically deform and adjust the metal coverage between the first sub-stent and the second sub-stent.

[0007] The application also provides an intravascular stent, which comprises a first sub-stent, a second sub-stent and a flexible component, the first sub-stent is woven into a tubular structure by a plurality of woven wires, the second sub-stent is woven into a tubular structure by a plurality of woven wires, the first sub-stent and the second sub-stent 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, the distance between the first sub-stent and the second sub-stent is adjusted to make the flexible component elastically deform and adjust the metal coverage between the first sub-stent and the second sub-stent.

[0008] Optionally, the flexible component comprises a flexible member, one end of the flexible member is connected to one end of the first sub-stent, and the other end of the flexible member is connected to one end of the second sub-stent, the flexible member is in a spiral or variable-diameter spiral structure, and when the flexible member is in the variable-diameter spiral structure, the outer diameter of the flexible member gradually increases first and then gradually decreases from the direction of the proximal end to the direction of the distal end.

[0009] Optionally, the flexible component comprises a plurality of first flexible wires, and the plurality of first flexible wires are in a spiral or variable-diameter spiral or straight wire structure, and are uniformly arranged around the axis of the first sub-stent.

[0010] Optionally, the flexible component comprises a plurality of first flexible wires, and the plurality of first flexible wires are uniformly arranged around the axis of the first sub-stent, and at least one deformation segment of the first flexible wire is annularly arranged in a clockwise or counterclockwise manner.

[0011] Optionally, the middle part of the first flexible wire has a plurality of deformation segments, and the plurality of deformation segments are arranged in a clockwise or counterclockwise manner.

[0012] Optionally, the middle part of the first flexible wire has a plurality of deformation segments, and part of the deformation segments are arranged in a clockwise manner, and the other part of the deformation segments are arranged in a counterclockwise manner.

[0013] Optionally, the flexible assembly comprises a plurality of first flexible wires, a plurality of second flexible wires, the plurality of first flexible wires are in helical or variable-diameter helical structure; the plurality of first flexible wires are uniformly arranged around the axis of the first sub-stent and located on one side of the axis of the first sub-stent; the plurality of second flexible wires are in straight wire or wave wire structure; the plurality of second flexible wires are uniformly arranged around the axis of the first sub-stent and located on the other side of the axis of the first sub-stent; when the first flexible wire is in variable-diameter helical structure, the outer diameter of the first flexible wire gradually increases first and then gradually decreases from the direction where the proximal end is located to the direction where the distal end is located.

[0014] Optionally, the flexible assembly comprises a plurality of first flexible wires, a plurality of second flexible wires, the plurality of first flexible wires are uniformly arranged around the axis of the first sub-stent and located on one side of the axis of the first sub-stent; the first flexible wire has at least one deformation segment in ring shape arranged clockwise or counterclockwise in the middle; the plurality of second flexible wires are in straight wire or wave wire structure; the plurality of second flexible wires are uniformly arranged around the axis of the first sub-stent and located on the other side of the axis of the first sub-stent.

[0015] Optionally, the flexible assembly comprises a plurality of first flexible wires, a plurality of second flexible wires, the plurality of first flexible wires are in straight wire structure; the plurality of first flexible wires are uniformly arranged around the axis of the first sub-stent; the plurality of second flexible wires are in helical or variable-diameter helical structure; each second flexible wire is sleeved on a first flexible wire.

[0016] Optionally, the flexible assembly comprises a plurality of first flexible wires uniformly arranged around the axis of the first sub-stent; the first flexible wire comprises a deformation segment, and the deformation segment is uniformly arranged around the axis of the first flexible wire by a plurality of flexible sub-wires in helical structure.

[0017] Optionally, the flexible assembly comprises a plurality of first flexible wires, a second flexible wire, the plurality of first flexible wires are in straight wire or wave wire structure; the plurality of first flexible wires are uniformly arranged around the axis of the first sub-stent; the second flexible wire is in helical or variable-diameter helical structure and sleeved on the plurality of first flexible wires.

[0018] Optionally, the flexible assembly further comprises a third flexible wire, the third flexible wire is in helical or variable-diameter helical structure and sleeved on the second flexible wire; the helical direction of the third flexible wire is opposite to the helical direction of the second flexible wire.

[0019] Optionally, the outer diameter of the first sub-stent gradually increases from the direction where the distal end is located to the direction where the proximal end is located near the second sub-stent; when the second sub-stent moves towards the first sub-stent and one end of the second sub-stent is located in the first sub-stent, a space for accommodating the interlayer is formed between the first sub-stent and the second sub-stent. The flexible assembly is wholly located in the accommodating sandwich, or a part of the flexible assembly is located in the accommodating sandwich and another part of the flexible assembly is located outside the accommodating sandwich and enters the aneurysm cavity.

[0020] In the embodiment, the flexible piece 21 is elastically deformed and the size of the gap of the flexible piece 21 is changed by the cooperation of the first sub-stent 11 and the second sub-stent 12 in the way that the second sub-stent 12 moves towards the first sub-stent 11 or the second sub-stent 12 moves away from the first sub-stent 11, so as to achieve the purpose of adjusting the metal coverage of the flexible piece 21 and the purpose of adjusting the metal coverage between the first sub-stent and the second sub-stent. Compared with the prior art, the adjustment range of the metal coverage between the first sub-stent and the second sub-stent in the embodiment is large, and the metal coverage is adjusted without affecting the outer diameter of the first sub-stent and the outer diameter of the second sub-stent, so that the first sub-stent and the second sub-stent have better effect of adhering to the inner wall of the blood vessel. The support effect on the spring coil located in the aneurysm cavity is further enhanced. The cooperation of the metal coverage between the first sub-stent and the second sub-stent and the spring coil located in the aneurysm cavity improves the occlusion effect of the flexible piece on the aneurysm neck and improves the embolization rate of the aneurysm cavity. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application, the related drawings will be briefly introduced below. It can be understood that the drawings described below are only used to illustrate some embodiments of the present application, and those skilled in the art can also obtain many other technical features and connection relationships not mentioned in the text from these drawings.

[0022] Figure 1 is a background technical drawing; Figure 2 is a schematic diagram of an embodiment of a vascular stent of the present application Figure 1 ; Figure 3 is a schematic diagram of an embodiment of a vascular stent of the present application Figure 2 ; Figure 4 is a schematic diagram of an embodiment of a vascular stent of the present application Figure 3 ; Figure 5 is a cross-sectional schematic diagram of an embodiment of a vascular stent of the present application Figure 1 ; Figure 6 is a schematic diagram of an embodiment of a vascular stent of the present application located in a blood vessel Figure 1 ; Figure 7 is a cross-sectional schematic diagram of an embodiment of a vascular stent of the present applicationFigure 2 ; Figure 8 is a schematic view of an embodiment of an intravascular stent of the present invention Figure 4 ; Figure 9 is a cross-sectional schematic view of an embodiment of an intravascular stent of the present invention Figure 3 ; Figure 10 is a schematic view of an embodiment of an intravascular stent of the present invention Figure 5 ; Figure 11 is a schematic view of an embodiment of an intravascular stent of the present invention Figure 6 ; Figure 12 is a schematic view of an embodiment of an intravascular stent of the present invention positioned within a blood vessel Figure 2 ; Figure 13 is a schematic view of an embodiment of a first flexible wire of an intravascular stent of the present invention Figure 1 ; Figure 14 is a schematic view of an embodiment of a first flexible wire of an intravascular stent of the present invention Figure 2 ; Figure 15 is a schematic view of an embodiment of a first flexible wire of an intravascular stent of the present invention Figure 3 ; Figure 16 is a schematic view of an embodiment of an intravascular stent of the present invention Figure 7 ; Figure 17 is a schematic view of an embodiment of an intravascular stent of the present invention Figure 8 ; Figure 18 is a schematic view of an embodiment of an intravascular stent of the present invention Figure 9 ; Figure 19 is a schematic view of an embodiment of an intravascular stent of the present invention positioned within a blood vessel Figure 3 ; Figure 20 is a schematic view of an embodiment of an intravascular stent of the present invention Figure 10 ; Figure 21 is a schematic view of an embodiment of a first flexible wire of an intravascular stent of the present invention Figure 11 is a schematic view of an embodiment of an intravascular stent of the present invention Figure 23 ; Figure 4 is a schematic view of an embodiment of a first flexible wire of an intravascular stent of the present inventionFigure 24 ; Figure 10 is a schematic view of an embodiment of an intravascular stent of the present application Figure 25 two; Figure 5 is a schematic view of an embodiment of a first flexible wire of an intravascular stent of the present application Figure 26 ; Figure 10 is a schematic view of an embodiment of an intravascular stent of the present application Figure 27 three; Figure 10 is a schematic view of an embodiment of an intravascular stent of the present application Figure 28 four; Figure 10 is a schematic view of an embodiment of an intravascular stent of the present application Figure 29 five; Figure 30 is a schematic view of an embodiment of a first sub-stent of an intravascular stent of the present application; Figure 10 is a schematic view of an embodiment of an intravascular stent of the present application Figure 31 six; Figure 4 is a schematic view of an embodiment of an intravascular stent of the present application Figure 1 .

[0023] BRIEF DESCRIPTION OF DRAWINGS 11, first sub-stent; 12, second sub-stent; 13, braided wire; 14, variable diameter portion; 21, flexible member; 22, first flexible wire; 23, shape-changing segment; 24, second flexible wire; 25, first connecting segment; 26, second connecting segment; 27, flexible sub-wire; 28, third flexible wire. DETAILED DESCRIPTION

[0024] In order to enable every detail of the present disclosure to be understood, the following describes the implementation of the present disclosure with reference to the accompanying drawings, which are used for reference only and are not intended to limit the present disclosure. In the following technical description, in order to facilitate explanation, a plurality of details are provided to provide a full understanding of the disclosed embodiments. However, one or more embodiments can still be implemented without these details. In other cases, well-known structures and devices can be simplified to facilitate the drawings.

[0025] The terms "first", "second", etc. in the description and claims of the present disclosure and the above drawings are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so as to implement the embodiments of the present disclosure described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion.

[0026] In the present disclosure, the terms "upper", "lower", "inner", "middle", "outer", "front", "back", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present disclosure and its embodiments, and are not intended to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. In addition, in addition to indicating the orientation or positional relationship, the above-mentioned terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain attachment relationship or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in the present disclosure can be understood according to the specific circumstances.

[0027] In addition, the terms "set", "connected", "fixed" should be broadly understood. For example, "connected" can be fixed connection, detachable connection, or integral structure; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through an intermediate medium, or internal communication between two devices, elements or components. For those skilled in the art, the specific meanings of the above terms in the present disclosure can be understood according to the specific circumstances.

[0028] Unless otherwise specified, the term "a plurality of" means two or more, and the term "a plurality of groups" means two groups or more.

[0029] It should be noted that the embodiments in the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0030] The inventors found that by extruding the existing braided stent, the metal coverage at the tumor neck port can be improved, but the stent forms a shuttle-shaped structure at the tumor neck port, as shown in Figure 2 The part of the stent outside the tumor neck port cannot be close to the inner wall of the blood vessel, which easily causes the risk of intravascular stenosis and the risk of thrombosis.

[0031] The inventors also searched the prior art, and the searched prior art is as follows: Prior art 1: invention patent with publication number CN115429372B; Prior art 2: invention patent application with publication number CN119587100A.

[0032] In view of the above, the inventors of the present application provide an intravascular stent to solve the above problems. Several specific embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0033] First embodiment The intravascular stent mentioned in this embodiment, as shown in Figure 3 , Figure 2 , comprises a first sub-stent 11, a second sub-stent 12, and a flexible member 21. The first sub-stent 11 is woven into a tubular structure by a plurality of woven wires 13, and the second sub-stent 12 is woven into a tubular structure by a plurality of woven wires 13. The first sub-stent 11 and the second sub-stent 12 are coaxially arranged. The wire diameter of the woven wires 13 woven into the first sub-stent 11 is the same as the wire diameter of the woven wires 13 woven into the second sub-stent 12. The first sub-stent 11 is connected to the second sub-stent 12 through the flexible member 21.

[0034] Optionally, the outer diameter of the first sub-stent 11 is the same as the outer diameter of the second sub-stent 12.

[0035] In this embodiment, the flexible member 21 is arranged as follows: Optionally, as shown in Figure 3 , the flexible member 21 has a spiral structure. The outer diameter of the flexible member 21 is the same as the outer diameter of the first sub-stent 11, and the wire diameter of the flexible member 21 is the same as the wire diameter of the woven wires 13 woven into the first sub-stent 11, i.e., the flexible member 21 has a spring-like structure. Alternatively, the wire diameter of the flexible member 21 is greater than the wire diameter of the woven wires 13 woven into the first sub-stent 11. One end of the flexible member 21 close to the distal end is connected to one end of the first sub-stent 11 close to the proximal end, and the other end of the flexible member 21 close to the proximal end is connected to one end of the second sub-stent 12 close to the distal end.

[0036] Optionally, as shown in Figure 2 , the flexible member 21 has a variable-diameter spiral structure. The outer diameter of the flexible member 21 gradually increases from the direction of the proximal end to the direction of the distal end, and then gradually decreases to the original outer diameter of the flexible member 21. The outer diameters of both ends of the flexible member 21 are the same as the outer diameter of the first sub-stent 11. The wire diameter of the flexible member 21 is the same as the wire diameter of the woven wires 13 woven into the first sub-stent 11. One end of the flexible member 21 close to the distal end is connected to one end of the first sub-stent 11 close to the proximal end, and the other end of the flexible member 21 close to the proximal end is connected to one end of the second sub-stent 12 close to the distal end. By arranging the flexible member 21 into a variable-diameter spiral structure and making the outer diameter of the middle part of the flexible member 21 the largest, when the intravascular stent of the present technical solution is implanted in the blood vessel, the middle part of the flexible member 21 can seal the aneurysm neck to prevent the spring coil from sliding out of the aneurysm cavity.

[0037] Optionally, as shown in Figure 3 ,Figure 3 As shown in any of the above two optional technical solutions, the intravascular stent further comprises a third flexible wire 28 in a spiral or variable-diameter spiral structure, and the third flexible wire 28 is sleeved on the flexible member 21. The spiral direction of the third flexible wire 28 is opposite to the spiral direction of the flexible member 21, for example, the spiral direction of the flexible member 21 is left-handed, and the spiral direction of the third flexible wire 28 is right-handed. In this technical solution, the third flexible wire 28 is sleeved on the flexible member 21, and the double-layer structure can not only improve the compliance of the intravascular stent, but also make the intravascular stent in this technical solution more easily fit the inner wall of the blood vessel in the tortuous blood vessel with a small bending radius.

[0038] Optionally, as shown in any of the above three optional technical solutions, the difference is that the number of flexible members 21 is multiple, and the multiple flexible members 21 are sequentially and spacedly arranged along the axis of the first sub-stent 11, and there is a gap between the two adjacent flexible members 21. The multiple flexible members 21 are coaxially arranged with the first sub-stent 11. Such arrangement can further increase the metal coverage between the first sub-stent and the second sub-stent. Figures 1 to 3

[0039] Any of the above four optional technical solutions can be selected.

[0040] The exemplary use process of the intravascular stent disclosed in the embodiment is as follows: As shown in any of the above three optional technical solutions, the difference is that the number of flexible members 21 is multiple, and the multiple flexible members 21 are sequentially and spacedly arranged along the axis of the first sub-stent 11, and there is a gap between the two adjacent flexible members 21. The multiple flexible members 21 are coaxially arranged with the first sub-stent 11. Such arrangement can further increase the metal coverage between the first sub-stent and the second sub-stent. Figure 4 ​As shown, the operator first releases the first sub-stent 11 in the blood vessel, so that the first sub-stent 11 adheres to the inner wall of the blood vessel, and the end of the first sub-stent 11 close to the proximal end is located on one side of the tumor neck. Then the flexible member 21 in the form of a spiral is released in the blood vessel. When the operator drives the second sub-stent 12 to move towards the first sub-stent 11, the first sub-stent 11 limits the flexible member 21, and through the cooperation of the first sub-stent 11 and the second sub-stent 12, the flexible member 21 is extruded, so that the extruded flexible member 21 is in a compressed state. With the movement of the second sub-stent 12 towards the first sub-stent 11, the flexible member 21 elastically deforms, the gap of the flexible member 21 gradually decreases, and the metal coverage of the flexible member 21 gradually increases. When the gap of the flexible member 21 gradually decreases to disappear, the metal coverage of the flexible member 21 is the largest at this time. Of course, the operator can also drive the second sub-stent 12 to move away from the first sub-stent 11, the first sub-stent 11 limits the flexible member 21, and through the cooperation of the first sub-stent 11 and the second sub-stent 12, the flexible member 21 is stretched, so that the stretched flexible member 21 is in a non-compressed state. With the movement of the second sub-stent 12 away from the first sub-stent 11, the flexible member 21 elastically deforms, the gap of the flexible member 21 gradually increases, and the metal coverage of the flexible member 21 gradually decreases. The operator can adjust the distance between the first sub-stent and the second sub-stent to cause the flexible member 21 to elastically deform, and achieve the purpose of adjusting the metal coverage between the first sub-stent and the second sub-stent. When the operator completes the adjustment of the metal coverage between the first sub-stent and the second sub-stent, finally the operator releases the second sub-stent 12 in the blood vessel, and makes the second sub-stent 12 adhere to the inner wall of the blood vessel, and the flexible member 21 in the compressed state is located at the tumor neck. The first sub-stent 11 and the second sub-stent 12 released in the blood vessel fix the flexible member 21.

[0041] In the embodiment, the flexible member 21 is pressed or stretched by the cooperation of the first sub-bracket 11 and the second sub-bracket 12 in the manner that the second sub-bracket 12 moves towards the first sub-bracket 11 or the second sub-bracket 12 moves away from the first sub-bracket 11, so that the flexible member 21 elastically deforms and the size of the gap of the flexible member 21 changes, achieving the purpose of adjusting the metal coverage of the flexible member 21 and the purpose of adjusting the metal coverage between the first sub-bracket and the second sub-bracket. Compared with the prior art, the adjustment range of the metal coverage between the first sub-bracket and the second sub-bracket in the embodiment is large, and the adjustment of the metal coverage does not affect the outer diameter of the first sub-bracket and the outer diameter of the second sub-bracket, so that the first sub-bracket and the second sub-bracket have better effect of adhering to the inner wall of the blood vessel. The support effect on the spring coil located in the aneurysm cavity is further enhanced. The cooperation of the metal coverage between the first sub-bracket and the second sub-bracket and the spring coil located in the aneurysm cavity improves the occlusion effect of the flexible member on the aneurysm neck, and improves the embolization rate of the aneurysm cavity.

[0042] Second embodiment The embodiment also proposes an intravascular stent. The second embodiment is different from the first embodiment in the structure of the flexible assembly, which comprises a first flexible wire 22. The first flexible wire 22 is arranged as follows: Optionally, as shown in Figure 5 , Figure 5 , the flexible assembly comprises a plurality of first flexible wires 22, each of which is in a straight wire structure and is uniformly arranged around the axis of the first sub-bracket 11. One end of the first flexible wire 22 is connected to the end of the first sub-bracket 11 close to the proximal end, and the other end of the first flexible wire 22 is connected to the end of the second sub-bracket 12 close to the distal end. When the intravascular stent of the technical solution is implanted in the blood vessel, the second sub-bracket 12 moves towards the first sub-bracket 11, and as the distance between the second sub-bracket 12 and the first sub-bracket 11 decreases, each of the plurality of first flexible wires 22 elastically deforms. When the end of the first sub-bracket 11 close to the proximal end contacts the end of the second sub-bracket 12 close to the distal end, the first flexible wire 22 reaches the maximum elastic deformation, and the first flexible wire 22 stops elastic deformation. The middle part of the first flexible wire 22 is arranged close to the axis of the first sub-bracket 11, i.e., as shown in Figure 6 . Such arrangement can increase the metal coverage between the second sub-bracket 12 and the first sub-bracket 11, and can also support the connection between the second sub-bracket 12 and the first sub-bracket 11.

[0043] Optionally, as shown in Figure 7 , Figure 7As shown, the difference from the above technical solution is that the inner diameter of the first sub-stent 11 is greater than the outer diameter of the second sub-stent 12. When the intravascular stent is implanted in the blood vessel, the second sub-stent 12 moves towards the first sub-stent 11, and as the distance between the second sub-stent 12 and the first sub-stent 11 decreases, the plurality of first flexible wires 22 all elastically deform, and in the process of elastic deformation, the first flexible wires 22 gradually change to a ring structure. When the end close to the distal end of the second sub-stent 12 enters the first sub-stent 11, and the end close to the distal end of the second sub-stent 12 is located at the end close to the proximal end of the first sub-stent 11, the first flexible wire 22 stops elastic deformation, and the first flexible wire 22 is in a ring structure, and the plurality of first flexible wires 22 are arranged along the axis of the first sub-stent 11. The first flexible wire 22 in a ring structure is located between the first sub-stent 11 and the second sub-stent 12, that is, as shown. Figure 8 The three-layer structure not only increases the metal coverage between the second sub-stent 12 and the first sub-stent 11, but also supports the first sub-stent 11 through the first flexible wire 22, further improving the effect of the first sub-stent 11 and the second sub-stent 12 adhering to the inner wall of the blood vessel.

[0044] Optionally, as shown, Figure 8 The flexible assembly includes a plurality of first flexible wires 22, the plurality of first flexible wires 22 are in a spiral structure, and the plurality of first flexible wires 22 are uniformly arranged around the axis of the first sub-stent 11. One end of the first flexible wire 22 is connected to the end close to the proximal end of the first sub-stent 11, and the other end of the first flexible wire 22 is connected to the end close to the distal end of the second sub-stent 12. The exemplary use process of the intravascular stent of the present technical solution is the same as that of the intravascular stent of the first embodiment.

[0045] Optionally, as shown, Figure 9 , Figure 9 The difference from the above technical solution is that the inner diameter of the first sub-stent 11 is greater than the outer diameter of the second sub-stent 12. When the intravascular stent is implanted in the blood vessel, the second sub-stent 12 moves towards the first sub-stent 11, and as the distance between the second sub-stent 12 and the first sub-stent 11 decreases, the plurality of first flexible wires 22 all elastically deform. When the end close to the distal end of the second sub-stent 12 enters the first sub-stent 11, and the end close to the distal end of the second sub-stent 12 is located at the end close to the proximal end of the first sub-stent 11, the first flexible wire 22 is located between the first sub-stent 11 and the second sub-stent 12, that is, as shown. Figure 9If the first flexible wire 22 in the spiral structure is fully or partially overlapped, the metal coverage between the second sub-stent 12 and the first sub-stent 11 can be increased, which is beneficial to the embolism of the aneurysm. If the first flexible wire 22 in the spiral structure is not overlapped at all, the bending profit of the intravascular stent in the tortuous blood vessel can be reduced, the compliance of the intravascular stent can be improved, and the adhesion effect of the first sub-stent 11 and the second sub-stent 12 to the inner wall of the blood vessel can be improved.

[0046] Optionally, as shown in Figure 10 , Figure 9 The difference from the above technical solution is that the flexible assembly includes a plurality of first flexible wires 22, the plurality of first flexible wires 22 are all variable-diameter spiral structures, and the outer diameter of the first flexible wire 22 gradually increases from the direction of the proximal end to the direction of the distal end and then gradually decreases to the original outer diameter of the first flexible wire 22. When the intravascular stent is implanted into the blood vessel, the second sub-stent 12 moves towards the first sub-stent 11, and as the distance between the second sub-stent 12 and the first sub-stent 11 decreases, the plurality of first flexible wires 22 all elastically deform. When the end close to the distal end of the second sub-stent 12 enters the first sub-stent 11, and the end close to the distal end of the second sub-stent 12 is located at the end close to the proximal end of the first sub-stent 11, the first flexible wire 22 is located between the first sub-stent 11 and the second sub-stent 12, that is, as shown in Figure 11 If the first flexible wire 22 in the spiral structure is fully or partially overlapped, the first flexible wire 22 in the variable-diameter spiral structure can further increase the support 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.

[0047] Optionally, as shown in Figure 12 , Figure 11As shown, the flexible assembly includes a plurality of first flexible wires 22, which are uniformly arranged around the axis of the first sub-stent 11. Since the plurality of first flexible wires 22 are structurally identical, one of the first flexible wires 22 is taken as an example for description. One end of the first flexible wire 22 is connected to the end of the first sub-stent 11 close to the proximal end, and the middle part of the first flexible wire 22 is arranged in a clockwise or counterclockwise annular deformation segment 23. The other end of the first flexible wire 22 is connected to the end of the second sub-stent 12 close to the distal end. When the intravascular stent is implanted in the blood vessel, the second sub-stent 12 moves towards the first sub-stent 11, and as the distance between the second sub-stent 12 and the first sub-stent 11 decreases, the plurality of first flexible wires 22 all elastically deform. When the end of the second sub-stent 12 close to the distal end contacts the end of the first sub-stent 11 close to the proximal end, the deformation segment 23 of the first flexible wire 22 is located outside the first sub-stent 11 or the second sub-stent 12, the deformation segment 23 of the first flexible wire 22 elastically deforms towards the direction away from the axis of the first sub-stent 11, and the deformation segment 23 enters the aneurysm cavity through the aneurysm neck and presses the spring coil located in the aneurysm cavity. Through the cooperation of the deformation segment 23 of the first flexible wire 22 and the spring coil located in the aneurysm cavity, the embolization effect of the aneurysm can be improved.

[0048] Optionally, on the basis of the above technical solution, as shown in Figure 13 、 Figure 11 One end of the first flexible wire 22 is connected to the end of the first sub-stent 11 close to the proximal end, the middle part of the first flexible wire 22 is arranged in a plurality of annular deformation segments 23 in a clockwise or counterclockwise direction, and the other end of the first flexible wire 22 is connected to the end of the second sub-stent 12 close to the distal end. In this technical solution, the plurality of deformation segments 23 have the same winding direction, which is clockwise winding or counterclockwise winding. By arranging a plurality of deformation segments with the same winding direction on the first flexible wire 22, and simultaneously pressing the spring coil located in the aneurysm cavity through the plurality of deformation segments, the pressing effect of the deformation segment on the spring coil is improved, the metal coverage between the second sub-stent 12 and the first sub-stent 11 is further increased, and the embolization effect of the aneurysm is improved.

[0049] Optionally, the difference from the above technical solution is that, as shown in Figure 14 、 Figure 11As shown in the figure, one end of the first flexible wire 22 is connected to one end of the first sub-stent 11 close to the proximal end, and the middle part of the first flexible wire 22 has two deformation sections 23. Specifically, the middle part of the first flexible wire 22 is first wound clockwise to form a ring-shaped deformation section 23, then the middle part of the first flexible wire 22 is further wound counterclockwise to form a ring-shaped deformation section 23, and finally the other end of the first flexible wire 22 is connected to one end of the second sub-stent 12 close to the distal end. By arranging multiple deformation sections with different winding directions on the first flexible wire 22, and through the coordinated cooperation of the counterclockwise winding deformation section and the clockwise winding deformation section, the extrusion effect of the deformation section on the spring ring is further improved, the metal coverage between the second sub-stent 12 and the first sub-stent 11 is increased, and the embolization effect of the aneurysm is improved.

[0050] Optionally, unlike the above technical solutions, as shown in Figure 15 、 Figure 16 As shown in the figure, one end of the first flexible wire 22 is connected to one end of the first sub-stent 11 close to the proximal end, and the middle part of the first flexible wire 22 has three deformation sections 23. Specifically, the middle part of the first flexible wire 22 is first wound clockwise to form a ring-shaped deformation section 23, then the middle part of the first flexible wire 22 is further wound counterclockwise to form a ring-shaped deformation section 23, and then the middle part of the first flexible wire 22 is further wound clockwise to form a ring-shaped deformation section 23, and finally the other end of the first flexible wire 22 is connected to one end of the second sub-stent 12 close to the distal end. By arranging an anticlockwise winding deformation section between two clockwise winding deformation sections, and using the anticlockwise winding deformation section to simultaneously apply a reverse force to the two clockwise winding deformation sections, the extrusion effect of the deformation section on the spring ring is further improved, and the embolization effect of the aneurysm is further improved.

[0051] The above nine optional technical solutions can be selected.

[0052] Third embodiment This embodiment also proposes an intravascular stent. The third embodiment is a further improvement based on the second embodiment, and the difference between the third embodiment and the second embodiment is the structure of the flexible assembly. The flexible assembly includes a first flexible wire 22 and a second flexible wire 24, which are specifically arranged as follows: Optionally, as shown in Figure 17 、 Figure 16As shown, the flexible assembly includes a plurality of first flexible wires 22 and a plurality of second flexible wires 24, the plurality of first flexible wires 22 are all in a spiral structure, and the plurality of second flexible wires 24 are all straight wires or wavy wires. The number of the first flexible wires 22 is the same as the number of the second flexible wires 24, and the plurality of first flexible wires 22 and the plurality of second flexible wires 24 are symmetrically arranged. Specifically, the plurality of first flexible wires 22 are arranged on one side of the axis of the first sub-stent 11, and the plurality of first flexible wires 22 are uniformly arranged around the axis of the first sub-stent 11. The plurality of second flexible wires 24 are arranged on the other side of the axis of the first sub-stent 11, and the plurality of second flexible wires 24 are uniformly arranged around the axis of the first sub-stent 11.

[0053] Optionally, as shown in Figure 17 、 Figure 16 , the flexible assembly includes a plurality of first flexible wires 22 and a plurality of second flexible wires 24, the plurality of first flexible wires 22 are all in a variable-diameter spiral structure, and the plurality of second flexible wires 24 are all straight wires or wavy wires. Specifically, the outer diameter of the first flexible wire 22 gradually increases from the direction of the proximal end to the direction of the distal end, and then gradually decreases to the original outer diameter of the first flexible wire 22. The number of the first flexible wires 22 is more than the number of the second flexible wires 24, and the plurality of first flexible wires 22 and the plurality of second flexible wires 24 are uniformly arranged around the axis of the first sub-stent 11.

[0054] Optionally, as shown in Figure 18 、 Figures 16 to 19 , the flexible assembly includes a plurality of first flexible wires 22 and a plurality of second flexible wires 24. Since the structures of the plurality of first flexible wires 22 are all the same, one of the first flexible wires 22 is taken as an example for introduction. The middle part of the first flexible wire 22 is arranged in a shape-changing segment 23 clockwise or counterclockwise, the shape-changing segment 23 is annular, and the number of the shape-changing segment 23 is one or more. The plurality of second flexible wires 24 are all straight wires or wavy wires. Specifically, the number of the first flexible wires 22 is less than the number of the second flexible wires 24, or the number of the first flexible wires 22 is more than the number of the second flexible wires 24. The plurality of first flexible wires 22 and the plurality of second flexible wires 24 are uniformly arranged around the axis of the first sub-stent 11.

[0055] Optionally, as shown in the figure, which is different from the above three technical solutions, the number of the first flexible wires 22 is the same as the number of the second flexible wires 24, the plurality of first flexible wires 22 and the plurality of second flexible wires 24 are uniformly arranged around the axis of the first sub-stent 11, and the two wires on both sides of the first flexible wire 22 are both second flexible wires 24, that is, the plurality of first flexible wires 22 and the plurality of second flexible wires 24 are alternately arranged.

[0056] The above four optional technical solutions can be selected.

[0057] An exemplary use process of the intravascular stent disclosed in the embodiment is as follows: As shown in Figure 20 , the operator first releases the first sub-stent 11 in the blood vessel, so that the first sub-stent 11 adheres to the inner wall of the blood vessel, and the end of the first sub-stent 11 close to the proximal end is located on one side of the aneurysm neck. Then the first flexible wire 22 and the second flexible wire 24 are released in the blood vessel. Since the inner diameter of the first sub-stent 11 in the released state is greater than the outer diameter of the second sub-stent 12 in the unreleased state, the operator drives the second sub-stent 12 to move towards the first sub-stent 11, and as the distance between the second sub-stent 12 and the first sub-stent 11 decreases, the plurality of first flexible wires 22 and the plurality of second flexible wires 24 all elastically deform. When the end close to the distal end of the second sub-stent 12 enters the first sub-stent 11, the operator releases the second sub-stent 12 in the blood vessel, so that the second sub-stent 12 adheres to the inner wall of the blood vessel, and the second flexible wire 24 in the compressed state is located between the first sub-stent 11 and the second sub-stent 12, which can improve the metal coverage between the first sub-stent and the second sub-stent, and make the first sub-stent and the second sub-stent adhere to the inner wall of the blood vessel better. The first flexible wire 22 in the compressed state enters the aneurysm cavity, and supports the spring coil in the aneurysm cavity, and also has a squeezing effect on the spring coil, thereby improving the embolization effect of the aneurysm. At the same time, it can also replace part of the spring coil, thereby reducing the amount of spring coil and reducing the recurrence rate of aneurysm after treatment.

[0058] Fourth embodiment The fourth embodiment also proposes an intravascular stent. The fourth embodiment is different from the third embodiment in the structure of the flexible assembly, which includes the first flexible wire 22 and the second flexible wire 24, and is specifically configured as follows: Optionally, as shown in Figure 20 , the flexible assembly includes a plurality of first flexible wires 22 and a plurality of second flexible wires 24, the plurality of first flexible wires 22 are straight wires, and the plurality of first flexible wires 22 are uniformly arranged around the axis of the first sub-stent 11. The plurality of second flexible wires 24 are in a spiral structure, and the number of the second flexible wires 24 is the same as that of the first flexible wires 22, so that in the 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 with the two ends of the first flexible wire 22.

[0059] Optionally, as shown in the figure, different from the above technical solutions, the number of the second flexible wires 24 is less than the number of the first flexible wires 22, so 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 with the two ends of the first flexible wire 22. The plurality of second flexible wires 24 are located on one side of the axis of the first sub-stent 11, and the plurality of second flexible wires 24 are uniformly arranged around the axis of the first sub-stent 11.

[0060] Optionally, as shown in Figure 21 、 Figure 22 , the flexible assembly includes a plurality of first flexible wires 22 and a plurality of second flexible wires 24, the plurality of first flexible wires 22 are straight wires, and the plurality of first flexible wires 22 are uniformly arranged around the axis of the first sub-stent 11. The plurality of second flexible wires 24 all have a variable-diameter spiral structure, specifically, the outer diameter of the second flexible wire 24 gradually increases from the direction of the proximal end to the direction of the distal end and then gradually decreases to the original outer diameter of the second flexible wire 24. The number of the second flexible wires 24 is the same as the number of the first flexible wires 22, so 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 with the two ends of the first flexible wire 22.

[0061] The above three optional technical solutions can be selected.

[0062] Compared with the prior art, in the present embodiment, the second flexible wire 24 in a spiral or variable-diameter spiral structure is sleeved on the first flexible wire 22 located between the first sub-stent 11 and the second sub-stent 12. When the intravascular stent is implanted in the blood vessel, the second sub-stent 12 moves towards the first sub-stent 11, and as the distance between the second sub-stent 12 and the first sub-stent 11 decreases, the plurality of first flexible wires 22 and the plurality of second flexible wires 24 all elastically deform. When the second sub-stent 12 approaches the distal end and enters the first sub-stent 11, the first flexible wire 22 and the second flexible wire 24 in the compressed state are located between the first sub-stent 11 and the second sub-stent 12, which can improve the metal coverage between the first sub-stent and the second sub-stent, and make the first sub-stent and the second sub-stent better adhere to the inner wall of the blood vessel. It can also improve the stability of the intravascular stent after release, and reduce the risk of displacement of the first sub-stent and the second sub-stent.

[0063] Fifth embodiment The present embodiment also proposes an intravascular stent, and the difference between the fifth embodiment and the second embodiment is the structure of the flexible assembly, which includes a plurality of first flexible wires 22, which are specifically arranged as follows: As shown in Figure 23 、 Figure 24As shown, the flexible assembly includes a plurality of first flexible wires 22, which are uniformly arranged around the axis of the first sub-stent 11. Since the plurality of first flexible wires 22 are of the same structure, one of the first flexible wires 22 is taken as an example for description. The first flexible wire 22 includes a first connecting section 25, a second connecting section 26, and a deformation section 23. The first connecting section 25 and the second connecting section 26 are coaxially arranged, and the deformation section 23 is located between the first connecting section 25 and the second connecting section 26. The deformation section 23 includes a plurality of flexible sub-wires 27, which are of the same structure. The middle part of the flexible sub-wire 27 protrudes away from the axis of the first connecting section 25, and the flexible sub-wire 27 is an arc-shaped wire. The plurality of flexible sub-wires 27 are uniformly arranged around the axis direction of the first connecting section 25, that is, the plurality of flexible sub-wires 27 can be regarded as being uniformly arranged around the axis of the first flexible wire 22. One end of the plurality of flexible sub-wires 27 close to the distal end is connected to one end of the first connecting section 25, the other end of the first connecting section 25 is connected to one end of the first sub-stent 11 close to the proximal end, and one end of the plurality of flexible sub-wires 27 close to the proximal end is connected to one end of the second connecting section 26, and the other end of the second connecting section 26 is connected to one end of the second sub-stent 12 close to the distal end.

[0064] Compared with the prior art, in the present embodiment, the deformation section 23 of the first flexible wire 22 is composed of a plurality of flexible sub-wires 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, the plurality of first flexible wires 22 all elastically deform, and the plurality of flexible sub-wires 27 of the first flexible wire 22 also elastically deform. When the one end of the second sub-stent 12 close to the distal end enters the first sub-stent 11, the first flexible wire 22 in the compressed state is located between the first sub-stent 11 and the second sub-stent 12, and the plurality of flexible sub-wires 27 can support the first sub-stent 11 at multiple points. In this way, the metal coverage between the first sub-stent and the second sub-stent can be improved, the stability of the intravascular stent after release can be further improved, and the displacement risk of the first sub-stent and the second sub-stent can be reduced.

[0065] Sixth embodiment The present embodiment also proposes an intravascular stent. The sixth embodiment is different from the fifth embodiment in the structure of the flexible assembly. The flexible assembly includes a plurality of first flexible wires 22, which are arranged as follows: As Figure 25 , Figure 26As shown, the flexible assembly includes a plurality of first flexible wires 22 which are uniformly arranged around the axis of the first sub-stent 11. Since the plurality of first flexible wires 22 are of the same structure, one of the first flexible wires 22 is taken as an example for description. The first flexible wire 22 includes a first connecting section 25, a second connecting section 26 and a deformation section 23. The first connecting section 25 and the second connecting section 26 are coaxially arranged, and the deformation section 23 is located between the first connecting section 25 and the second connecting section 26. The deformation section 23 includes a plurality of flexible sub-wires 27 which are of the same structure and are in a spiral structure. The plurality of flexible sub-wires 27 are uniformly arranged around the axis direction of the first connecting section 25, i.e. the deformation section 23 can be regarded as a spiral structure. One end of the plurality of flexible sub-wires 27 close to the distal end is connected to one end of the first connecting section 25, the other end of the first connecting section 25 is connected to one end of the first sub-stent 11 close to the proximal end, and one end of the plurality of flexible sub-wires 27 close to the proximal end is connected to one end of the second connecting section 26, and the other end of the second connecting section 26 is connected to one end of the second sub-stent 12 close to the distal end.

[0066] Compared with the prior art, in the present embodiment, the deformation section is formed by the plurality of flexible sub-wires 27 in a spiral structure. 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, the plurality of first flexible wires 22 all elastically deform, and the plurality of flexible sub-wires 27 of the first flexible wire 22 also elastically deform. When one end of the second sub-stent 12 close to the distal end enters the first sub-stent 11, the first flexible wire 22 in a compressed state is located between the first sub-stent 11 and the second sub-stent 12, and the deformation section in a spiral structure has stronger support force for the first sub-stent 11, further improving the stability of the intravascular stent after release.

[0067] Seventh embodiment The present embodiment also proposes an intravascular stent. The seventh embodiment is different from the third embodiment in the structure of the flexible assembly. The flexible assembly includes a first flexible wire 22 and a second flexible wire 24, which are arranged as follows: Optionally, as Figure 27As shown in the figure, the flexible assembly includes a plurality of first flexible wires 22, a second flexible wire 24, the plurality of first flexible wires 22 are straight wires or wavy wires, and the plurality of first flexible wires 22 are uniformly arranged around the axis of the first sub-stent 11. The second flexible wire 24 has a spiral structure, and the second flexible wire 24 is sleeved on the plurality of first flexible wires 22, that is, the plurality of first flexible wires 22 are located in the second flexible wire 24 having the spiral structure. In the technical solution, the second flexible wire 24 having the spiral structure is sleeved on the plurality of first flexible wires 22, and the compliance of the intravascular stent can be improved through the double-layer structure, so that the intravascular stent in the technical solution is more convenient to fit the inner wall of the blood vessel in the tortuous blood vessel with a small bending radius.

[0068] Optionally, as shown in the figure, Figure 28 On the basis of the above technical solution, the flexible assembly further includes a third flexible wire 28, the third flexible wire 28 has a spiral structure, and the third flexible wire 28 is sleeved on the second flexible wire 24, that is, the second flexible wire 24 is located between the third flexible wire 28 and the plurality of first flexible wires 22. The spiral direction of the third flexible wire 28 is opposite to the spiral direction of the second flexible wire 24, for example, the spiral direction of the second flexible wire 24 is left-handed, and the spiral direction of the third flexible wire 28 is right-handed. In the technical solution, the second flexible wire 24 having the spiral structure is sleeved on the plurality of first flexible wires 22, and the third flexible wire 28 having the spiral structure is sleeved on the second flexible wire 24, so that the compliance of the intravascular stent can be improved through the three-layer structure, the intravascular stent in the technical solution is more convenient to fit the inner wall of the blood vessel in the tortuous blood vessel with a small bending radius. The stability of the intravascular stent in the blood vessel can be improved, and the metal coverage between the first sub-stent and the second sub-stent is increased.

[0069] Optionally, as shown in the figure, Figure 27 The flexible assembly includes a plurality of first flexible wires 22, a second flexible wire 24, the plurality of first flexible wires 22 are straight wires or wavy wires, and the plurality of first flexible wires 22 are uniformly arranged around the axis of the first sub-stent 11. The second flexible wire 24 has a spiral structure, and the second flexible wire 24 is sleeved on the plurality of first flexible wires 22, that is, the plurality of first flexible wires 22 are located in the second flexible wire 24 having the spiral structure. In the technical solution, the second flexible wire 24 having the spiral structure is sleeved on the plurality of first flexible wires 22, and the compliance of the intravascular stent can be improved through the double-layer structure, so that the intravascular stent in the technical solution is more convenient to fit the inner wall of the blood vessel in the tortuous blood vessel with a small bending radius. The stability of the intravascular stent in the blood vessel can be improved, and the metal coverage between the first sub-stent and the second sub-stent is increased.

[0070] Optionally, as shown in the figure, Figure 28 , Figure 8As shown in the above technical solution, on the basis of the above technical solution, the flexible assembly further comprises a third flexible wire 28, the third flexible wire 28 has a variable-diameter spiral structure, the outer diameter of the third flexible wire 28 gradually increases from the direction of the proximal end to the direction of the distal end and then gradually decreases to the original outer diameter of the third flexible wire 28, the third flexible wire 28 is sleeved on the second flexible wire 24, that is, the second flexible wire 24 is located between the third flexible wire 28 and the plurality of first flexible wires 22. The spiral direction of the third flexible wire 28 is opposite to the spiral direction of the second flexible wire 24, specifically, the spiral direction of the second flexible wire 24 is left-handed, and the spiral direction of the third flexible wire 28 is right-handed. In the technical solution, the second flexible wire 24 having a variable-diameter spiral structure is sleeved on the plurality of first flexible wires 22, and the third flexible wire 28 having a variable-diameter spiral structure is sleeved on the second flexible wire 24. Through the three-layer structure, the compliance of the intravascular stent can be improved, the intravascular stent can better fit the inner wall of the blood vessel in the scene of the tortuous blood vessel with a small bending radius, the stability of the intravascular stent in the blood vessel can be improved, and the metal coverage between the first sub-stent and the second sub-stent can be increased.

[0071] The above four optional technical solutions can be selected.

[0072] Eighth embodiment The eighth embodiment also proposes an intravascular stent, which is a further improvement based on any one of the first to seventh embodiments, and the main improvement is in the first sub-stent 11, specifically as follows: Optionally, as shown in Figure 9 , Figure 29 , Figure 19 As shown, the end of the first sub-stent 11 close to the second sub-stent 12 has a variable-diameter portion 14, the outer diameter of one end of the variable-diameter portion 14 is the same as the outer diameter of the first sub-stent 11, and the outer diameter of the variable-diameter portion 14 gradually increases from the direction of the distal end to the direction of the proximal end. Preferably, the outer diameter of the variable-diameter portion 14 gradually increases from the direction of the distal end to the direction of the proximal end to 1.01-4 times the outer diameter of the first sub-stent 11. When the second sub-stent 12 moves towards the first sub-stent 11, and the end close to the distal end of the second sub-stent 12 enters the variable-diameter portion 14 of the first sub-stent, a containing interlayer is formed between the end close to 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 assembly to elastically deform and makes the flexible assembly in a compressed state, and the flexible assembly is entirely located in the containing interlayer. For example, the flexible assembly comprises a plurality of first flexible wires 22, and the plurality of first flexible wires 22 in the compressed state are all located in the containing interlayer.

[0073] Optionally, as shown in Figure 29 , Figure 30 , Figures 29 to 31As shown, the difference between the above technical solution is that when the second sub-stent 12 moves towards the first sub-stent 11, and the end close to the distal end of the second sub-stent 12 enters the variable diameter part 14 of the first sub-stent, an accommodation interlayer is formed between the end close to the distal end of the second sub-stent 12 and the variable diameter part 14 of the first sub-stent 11. The flexible assembly of the second sub-stent 12 is driven to elastically deform, part of the flexible assembly is located in the accommodation interlayer and is in a compressed state, and the other part of the flexible assembly is located outside the accommodation interlayer and enters the aneurysm cavity. And part of the variable diameter part 14 of the first sub-stent enters the aneurysm and cooperates with the flexible assembly to support the spring ring, and the remaining part of the variable diameter part 14 elastically deforms along the inner wall of the blood vessel. For example, the flexible assembly includes a plurality of first flexible wires 22 and a plurality of second flexible wires 24, and the second flexible wires 24 in the compressed state are located in the accommodation interlayer, and the first flexible wires 22 enter the aneurysm cavity and support the spring ring.

[0074] Optionally, as shown, ​ The difference between the above technical solution is that the aneurysm is located at the bifurcation of the blood vessel, the first sub-stent 11 is implanted in the blood vessel, and the first sub-stent 11 is arranged close to the distal end. The variable diameter part 14 can adapt to the structure at the bifurcation of the blood vessel, further increasing the stability of the first sub-stent 11 in the blood vessel. And part of the variable diameter part 14 shields the aneurysm neck, such a design can further reduce the aneurysm neck, and can also support the spring ring located in the aneurysm. Preferably, the part of the variable diameter part 14 shielding the aneurysm neck accounts for one half of the aneurysm neck. When the second sub-stent 12 moves towards the first sub-stent 11, and the end close to the distal end of the second sub-stent 12 enters the variable diameter part 14 of the first sub-stent, an accommodation interlayer is formed between the end close to the distal end of the second sub-stent 12 and the variable diameter part 14 of the first sub-stent 11. The flexible assembly of the second sub-stent 12 is driven to elastically deform, part of the flexible assembly is located in the accommodation interlayer and is in a compressed state, and the other part of the flexible assembly is located outside the accommodation interlayer and enters the aneurysm cavity, which completes the implantation of the intravascular stent. For example, the flexible assembly includes a plurality of first flexible wires 22 and a plurality of second flexible wires 24, and the second flexible wires 24 in the compressed state are located between the first sub-stent 11 and the second sub-stent 12, for increasing the metal coverage. And the first flexible wires 22 enter the aneurysm cavity and cooperatively cooperate with the variable diameter part 14 to support the spring ring located in the aneurysm.

[0075] The above three optional technical solutions can be selected.

[0076] In the eight embodiments of the present application, in order to facilitate the further explanation of the technical solutions, the eight embodiments are introduced in the state that the intravascular stent is not implanted in the blood vessel.

[0077] If the endovascular stents in the eight embodiments are introduced in the state of being implanted in the blood vessels, the first sub-stent 11 is arranged close to the distal end, and the second sub-stent 12 is arranged close to the proximal end. Since the blood vessel diameter close to the proximal end is greater than the blood vessel diameter close to the distal end, and the blood vessel constrains the endovascular stent, the outer diameter of the second sub-stent 12 released in the blood vessel is greater than the outer diameter of the first sub-stent 11 released in the blood vessel.

[0078] Finally, it should be noted that those skilled in the art can understand that, in order to enable the reader to better understand the present application, the embodiments of the present application propose many technical details. However, even without these technical details and various changes and modifications based on the above embodiments, the technical solutions claimed in each claim of the present application can be basically realized. Therefore, in actual applications, various changes can be made to the above embodiments in form and detail without departing from the spirit and scope of the present application.

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. The flexible component includes multiple first flexible filaments and multiple second flexible filaments. Each of the first flexible filaments has a helical structure, with one end connected to the proximal end of a first sub-support and the other end connected to the distal end of a second sub-support. Each of the multiple second flexible filaments has a straight or wavy structure, with one end connected to the proximal end of the first sub-support and the other end connected to the distal end of the second sub-support. There are gaps between adjacent first flexible filaments and between adjacent second flexible filaments. The multiple first and second flexible filaments are evenly distributed around the axis of the first 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 flexible component includes: When the first flexible filament has a variable diameter spiral structure, the outer diameter of the first flexible filament gradually increases and then gradually decreases from the direction of the proximal end to the direction of the distal end.

3. An intravascular 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. The flexible component includes multiple first flexible filaments evenly arranged around the axis of the first sub-support; the first flexible filament includes a first connecting segment, a second connecting segment, and a deformation segment, the first connecting segment and the second connecting segment are arranged coaxially, and the deformation segment is located between the first connecting segment and the second connecting segment; the deformation segment is composed of multiple flexible sub-filaments with an arc-shaped filament structure evenly arranged around the axis of the first flexible filament, or the deformation segment is composed of multiple flexible sub-filaments with a spiral shape evenly arranged around the axis of the first flexible filament; One end of a plurality of flexible sub-filaments near the distal end is connected to one end of a first connecting segment, and the other end of the first connecting segment is connected to one end of a first sub-support near the proximal end; one end of a plurality of flexible sub-filaments near the proximal end is connected to one end of a second connecting segment, and the other end of the second connecting segment is connected to one end of a second sub-support near the distal end; 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.

4. 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. The flexible component includes multiple first flexible filaments and multiple second flexible filaments; the multiple first flexible filaments are all straight filaments and are evenly distributed around the axis of the first sub-support; the multiple second flexible filaments are all spiral filaments and are respectively sleeved on a first flexible filament; one end of the first flexible filament is connected to the proximal end of the first sub-support, and the other end of the first flexible filament 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.

5. The endovascular stent according to claim 4, characterized in that, The multiple secondary flexible filaments all have a variable diameter spiral structure.

6. An intravascular 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. The flexible component includes multiple first flexible filaments and second flexible filaments; the multiple first flexible filaments are all straight or wavy filaments, and the multiple first flexible filaments are evenly distributed around the axis of the first sub-support; one end of the first flexible filament is connected to the proximal end of the first sub-support, and the other end of the first flexible filament is connected to the distal end of the second sub-support; the second flexible filament has a spiral structure and is sleeved on the multiple first flexible filaments. 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.

7. The endovascular stent according to claim 6, characterized in that, The flexible component also includes: The third flexible filament has a spiral structure and is sleeved on the second flexible filament; the spiral direction of the third flexible filament is opposite to that of the second flexible filament.

8. The endovascular stent according to claim 6, characterized in that, The second flexible filament has a variable diameter spiral structure and is sleeved on multiple first flexible filaments.

9. The endovascular stent according to claim 8, characterized in that, The flexible component also includes: The third flexible filament has a variable diameter spiral structure and is sleeved on the second flexible filament; the spiral direction of the third flexible filament is opposite to that of the second flexible filament.

10. The endovascular stent according to claim 6, 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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