Venous stent
By using a venous stent with multiple interwoven braided wires, combined with the design of a support segment and a compliance segment, the shortcomings of existing stents in terms of radial support and flexibility are solved, achieving a balance between long-term support and compliance, avoiding vascular re-occlusion and maintaining morphology.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SHANGHAI TENDFO MEDICAL TECH CO LTD
- Filing Date
- 2023-05-22
- Publication Date
- 2026-08-04
AI Technical Summary
Existing venous stents are insufficient in providing radial support and flexibility, making it difficult to simultaneously meet the requirements of long-term support for compression sites and compliance for vascular sites with high curvature or mobility.
A venous stent is designed using multiple braided filaments interwoven in a bidirectional spiral pattern, comprising a support segment and a compliant segment. The braided intersections of the support segment are fixed, resulting in high radial compressive strength. The braided intersections of the compliant segment are movable. The combination of the support and compliant segments provides strong radial support and superior flexibility.
It achieves long-term resistance to vascular compression at the compression site without easily collapsing, avoiding long-term re-occlusion, while maintaining the natural shape of the blood vessel at curved or mobile sites, meeting the physical performance requirements of different sites.
Smart Images
Figure CN116585082B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of medical device technology, and in particular to a venous vascular stent. Background Technology
[0002] Venous compression often results from physiological or pathological factors causing stenosis of the vascular passage. Surgical treatment primarily aims to relieve the narrowing of the vein, quickly restore blood flow, and restore normal blood flow. Among existing venous interventional stenting techniques, braided stents remain widely used due to their low cost, superior flexibility, and strong fatigue resistance. However, braided stents suffer from low radial support, often failing to withstand venous compression and leading to long-term re-occlusion. Furthermore, the physical performance requirements of stents vary depending on the vascular anatomy. Strong radial support is needed for compression sites, while superior compliance is required for tortuous or highly mobile anatomical sites. Existing braided stents struggle to meet these clinical requirements. Although laser-engraved stents offer strong radial support and can improve flexibility through open-loop design, they suffer from higher costs and poorer fatigue durability. Summary of the Invention
[0003] The purpose of this invention is to provide a venous vascular stent that combines the advantages of braided stents, such as low cost, superior flexibility, and strong fatigue resistance, while providing sufficient radial support to improve the long-term patency of the venous compression site and meeting the compliance requirements of curved or highly mobile vascular sites.
[0004] To address the aforementioned technical problems, this invention provides a venous vascular stent. The venous vascular stent is constructed by interlacing multiple braided filaments in both forward and reverse spirals, forming a stent structure capable of radial expansion and contraction. The venous vascular stent includes a support segment and a compliant segment connected end-to-end. The radial compressive strength of the support segment is greater than that of the compliant segment. The stent includes multiple circumferentially and axially spaced braiding intersections. The compressive strength of each braided filament in the support segment is greater than that of each braided filament in the compliant segment. Furthermore, the braiding intersections in the support segment are fixed intersections, while the braiding intersections in the compliant segment are movable intersections.
[0005] As one embodiment, the braided intersections of the support segment adopt a fixed braided cross structure; the braided intersections of the conforming segment adopt a movable braided cross structure.
[0006] As one embodiment, the fixed braided cross structure includes: two cross yarns, each cross yarn including two sets of yarns, any one of the two sets of yarns forming a cross loop, and the cross loops of the two sets of yarns intersecting each other to form the fixed braided cross structure.
[0007] As one embodiment, the active braided cross includes two cross strands, with one of the cross strands overlapping the other to form the active braided cross.
[0008] As one embodiment, the compliant section is tapered, and the support section includes an anchoring section and a tapered section; the anchoring section, the tapered section, and the compliant section are sequentially connected along the axial direction;
[0009] The diameter of the proximal end of the conical segment is larger than the diameter of the distal end of the compliant segment.
[0010] As an example, the proximal end of the anchoring section is flared, and the taper angle of the flared section is greater than 0° and less than 90°.
[0011] As one embodiment, the apex of the proximal end of the anchoring segment is located on the same vertex plane, and the vertex plane is inclined or perpendicular to the axis of the venous stent.
[0012] As an example, each braiding filament of the anchoring section and the conical section contains multiple monofilaments, and the distal end of the conical section contains multiple braiding filament splitting vertices evenly distributed along the circumference. Each braiding filament is split into N braiding filaments at the splitting vertices, and the split braiding filaments continue to be woven in a spiral to form the compliant section; N is a natural number greater than 1.
[0013] Optionally, N equals 2;
[0014] Optionally, the number of weaving intersections in the anchoring section is the same as the number of weaving intersections in the tapered section and they are evenly distributed circumferentially, and the number of weaving intersections in the axial direction of the conforming section is the same and they are evenly distributed circumferentially.
[0015] As one embodiment, the compliant segment continues to extend spirally at at least one weaving intersection and forms an opening;
[0016] Optionally, the opening is formed by spirally extending at the weaving intersection of the outer end of the compliant section;
[0017] The braided threads at the intersection of the braids in the opening are arranged in parallel and welded together; or
[0018] The braided threads at the intersection of the braids in the opening are interlaced and welded together; or
[0019] The braided threads at the intersection of the openings are interlaced and movably connected.
[0020] As one embodiment, the braided yarn includes at least one developer-enhancing yarn with developer capability;
[0021] The developing enhancement filament includes: a hollow-shaped memory filament and a developing inner core, wherein the developing inner core is disposed within the hollow-shaped memory filament; or
[0022] The developing enhancement filament includes: a shape memory filament, the outer wall of which is provided with a developing metal coating; or
[0023] The developing enhancement wire includes: shape memory composite wire and developing metal composite wire, wherein the shape memory composite wire and developing metal composite wire are wound or arranged in parallel to form the developing enhancement wire;
[0024] Optionally, the developing enhancement wire consists of two strands.
[0025] As can be seen from the above technical solutions, the embodiments of the present invention have at least the following advantages and positive effects:
[0026] The venous stent of this invention is a braided stent with a support segment and a compliant segment connected end to end. The radial compressive strength of the support segment is greater than that of the compliant segment. Based on the advantages of braided stents, the strong support strength of the support segment can resist the compression of the vascular compression site for a long time and is not easy to collapse, thus avoiding long-term re-occlusion. At the same time, the flexibility of the compliant segment can meet the physical performance requirements of the vascular bend or mobile part, without affecting the natural bending and mobility of the vascular, thereby preserving a more physiological vascular anatomical shape and meeting the physical performance requirements of the stent for different vascular sites. Attached Figure Description
[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. It is understood that the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.
[0028] Figure 1 , Figure 2 These are schematic diagrams of the venous vascular stents provided in the embodiments of the present invention;
[0029] Figures 3a-3c A schematic diagram of the braided wire of the support segment of a venous stent provided in an embodiment of the present invention;
[0030] Figure 4a , 4bThese are schematic diagrams of the braiding structure at the braiding intersections of the venous vascular stent provided in the embodiments of the present invention;
[0031] Figure 5a A schematic diagram of the parallel welding of braided wires at the braided intersection of the outer end opening of the compliant segment of the venous stent provided in an embodiment of the present invention;
[0032] Figure 5b This is a schematic diagram of the structure of the braided wires interlaced and welded at the braided intersection of the outer end opening of the compliant segment of the venous stent provided in an embodiment of the present invention;
[0033] Figure 5c This is a schematic diagram of the movable connection of braided wires at the braided intersection point at the outer end opening of the compliant segment of the venous stent provided in an embodiment of the present invention.
[0034] Figures 6a to 6d These are schematic diagrams of the imaging enhancement wires of the venous vascular stents provided in the embodiments of the present invention. Detailed Implementation
[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the various embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been presented in the various embodiments of the present invention to enable the reader to better understand the present invention. However, the technical solutions claimed in the present invention can be implemented even without these technical details and various changes and modifications based on the following embodiments.
[0036] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0037] It should be noted that, unless otherwise explicitly stated, the terms “connected” and “linked” should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components.
[0038] Please see Figure 1 , Figure 2As shown, this embodiment of the invention provides a venous vascular stent suitable for interventional treatment of venous compression, including but not limited to interventional treatment of the iliac and femoral veins, which can quickly relieve venous compression and restore blood flow. The venous vascular stent of this embodiment is integrally woven from multiple braided filaments in a bidirectional spiral pattern, forming a stent structure capable of radial expansion and contraction. The braided stent is inexpensive, highly flexible, and has strong fatigue resistance.
[0039] The venous stent mainly consists of a support segment and a compliant segment 3, which are connected end-to-end. The radial compressive strength of the support segment is greater than that of the compliant segment 3. The stent includes multiple circumferentially and axially spaced braided intersections. The compressive strength of each braided filament in the support segment is greater than that of each braided filament in the compliant segment. The braided intersections in the support segment are fixed, while those in the compliant segment 3 are movable. Multiple structurally identical braided filaments can be used to begin braiding from the proximal end of the support segment, interweaving in a right-handed and left-handed spiral pattern along the axial direction. Each braided filament can contain multiple monofilaments. After the support segment is completed, each braided filament is split into multiple strands and braided again in a forward and reverse spiral pattern until the compliant segment 3 is completed. This ensures that the compressive strength of each braided filament in the support segment is greater than that of the braided filaments in the compliant segment 3, thus making the radial compressive strength of the support segment greater than that of the compliant segment 3. Furthermore, since the braided intersections of the support segment are fixed, compared to the movable intersection structure of traditional stents, the fixed braided intersections ensure structural stability at the braided intersections, making them less prone to collapse and deformation due to radial pressure. This results in the support segment having strong radial compressive strength, capable of withstanding long-term pressure at the vascular compression site, and less prone to restenosis. The braided intersections of compliant segment 3 are movable, thus allowing compliant segment 3 to maintain superior flexibility.
[0040] When in use, the support segment of the venous stent is placed at the site of vascular compression, while the compliant segment 3 is placed at the bend or moving part of the blood vessel. While possessing all the advantages of braided stents, the support segment has a greater radial compressive strength, thus it can resist vascular compression for a long time without easily collapsing or deforming, thereby avoiding long-term vascular re-occlusion. The compliant segment 3 has a smaller radial compressive strength, so it can better conform to the anatomical shape of the blood vessel, thus preserving a more physiological vascular anatomy.
[0041] The braided intersections of the support section can employ a fixed braided cross structure. For example, the fixed braided cross structure may include two cross strands, each cross strand comprising two sets of strands, with either set forming a cross loop, and the cross loops of the two sets of strands intersecting each other to form the fixed braided cross structure. This allows fixed braided intersections to be formed directly during the braiding process. It is understood that the braided intersections of the support section can also be formed using other methods, such as welding, and no excessive limitations are imposed here.
[0042] The braided intersections of the compliant segment 3 can employ a movable braided cross structure. For example, a movable braided cross may include two cross strands, with one strand overlapping the other to form the movable braided cross. This movable braided cross allows the compliant segment 3 to retain superior compliance. In areas of vascular curvature or mobility, when the compliant segment 3 of the venous stent is radially compressed, its circumferential braided intersections can move freely according to the magnitude of the force, causing the compliant segment to circumferentially open or slightly contract, thereby better preserving the physiological and anatomical morphology of the blood vessel.
[0043] To improve anchoring performance, the support segment may include an anchoring segment 1 and a tapered segment 2. Anchoring segment 1, tapered segment 2, and compliant segment 3 are connected sequentially along the axial direction. The compliant segment 3 may be tapered, with the diameter D1 of the proximal end of tapered segment 2 being larger than the diameter D2 of the distal end of compliant segment 3, thus making the stent more conform to the anatomical shape of the blood vessel. It is understood that the diameters of the support segment and the compliant segment 3 may also be the same.
[0044] The proximal end of anchoring segment 1 can be flared, and the taper angle α1 of the flare can be greater than 0° and less than 90°. The proximal end is the end closest to the heart when the stent is implanted into the vein. The apex of the proximal end of anchoring segment 1 can penetrate into the vessel wall, and the flared structure of anchoring segment 1 allows the stent to be reliably anchored to the vein. It is understood that the stent can also be anchored using structures such as barbs, and no excessive restrictions are placed here.
[0045] The apex of the proximal end of anchoring segment 1 can be located on the same vertex plane, and the vertex plane can be inclined relative to the axis of the venous stent. That is, the apex of the proximal end of anchoring segment 1 adopts an oblique design. When the stent is placed in the "V"-shaped common iliac vein, the oblique opening of the proximal end of the stent faces the opposite side, which can reduce the obstruction of blood flow on the opposite side. For example, when the proximal end of the stent is located in the common iliac vein of the left leg, the oblique opening of the proximal end facing the right side can reduce the obstruction of blood flow in the common iliac vein of the right leg and reduce the risk of complications. Alternatively, the apex plane can also be set perpendicular to the axis of the venous stent, without excessive restrictions.
[0046] Each braiding filament in both anchoring segment 1 and tapered segment 2 comprises multiple monofilaments, which can be shape memory filaments with identical shape and structure. The distal end of tapered segment 2 contains multiple circumferentially distributed braiding filament splitting vertices. Each braiding filament at the distal end of tapered segment 2 splits into N braiding filaments at each splitting vertex. These split filaments continue to be spirally interwoven to form conforming segment 3. N is a natural number greater than 1. For example, N can be equal to 2, meaning each braiding filament splits into two strands at the splitting vertex and continues weaving. It is understood that it can also be split into more strands, such as three strands; no excessive limitation is imposed here.
[0047] The number of braided intersections in anchoring section 1 is the same as the number of braided intersections in tapered section 2 and they are evenly distributed circumferentially. The number of braided intersections in compliant section 3 is the same in the axial direction and they are evenly distributed circumferentially, so that the support has uniform support performance in the circumferential direction.
[0048] At least one braided intersection at the outer end of compliant segment 3 can continue to spirally extend and form an opening. Furthermore, each braided intersection at the outer end of compliant segment 3 can continue to spirally extend and form an opening. The openings disperse the stress on the vessel wall, preventing damage to the vessel wall from the tip of the venous stent.
[0049] Specifically, the venous stent includes multiple right-handed and left-handed helical braided wires. The multiple right-handed and left-handed helical braided wires are interwoven in both directions to form a support segment. At the end of the support segment, each braided wire is split and then interwoven in both directions to complete the compliant segment 3, thereby forming a stent in one piece. To facilitate differentiation between different parts, the vertex of the proximal end of anchoring section 1 is marked as 11, the right-handed wire of anchoring section is marked as 111, and the left-handed wire of anchoring section is marked as 112. The weaving intersection of the right-handed wire 111 and the left-handed wire 112 of anchoring section is marked as 12. The right-handed wire of conical section is marked as 21, the left-handed wire of conical section is marked as 22, the weaving intersection of conical section is marked as 23, the split vertex of the conical section weaving wire is marked as 24, the right-handed splitting wire split from split vertex 24 is marked as 241, and the left-handed splitting wire is marked as 242. The weaving intersection where the split right-handed wire 241 and the split left-handed wire first meet again is marked as 25. The right-handed wire of compliant section is marked as 31, the left-handed wire of compliant section is marked as 32, the weaving intersection of compliant section is marked as 33, the weaving intersection of open section is marked as 34, the right-handed wire of open section is marked as 341, and the left-handed wire of open section is marked as 342.
[0050] Figure 1 From left to right, the three segments of the venous stent are the anchoring segment 1, the tapered segment 2, and the compliant segment 3. The weaving method of the venous stent 1 in this embodiment is described below:
[0051] Take multiple braiding threads and weave them from left to right, with each thread consisting of at least two monofilaments. (See also...) Figure 3a As shown, two monofilaments (101-102) can be twisted together to form a single braided thread. For some examples, please refer to [link to relevant documentation]. Figure 3b , 3c As shown, each braiding filament may include three or four monofilaments. Of the three monofilaments (101-103), two monofilaments (102-103) extend along the first helical direction, and the remaining monofilament 103 extends along the second helical direction and is interwoven with the two monofilaments (102-103) to form a single braiding filament. Of the four monofilaments (101-104), two are grouped together and interwoven along the first and second helical directions respectively to form a single braiding filament. Multiple braiding filaments are grouped in pairs at the proximal end of the support (i.e.,... Figure 1The proximal vertex 11 of the anchoring segment 1 is formed by intersecting and welding the left and right ends of the anchoring segments. Exemplarily, there may be four proximal vertexes 11, evenly distributed circumferentially. It is understood that the anchoring segment 1 may include more vertices 11, without excessive limitation.
[0052] All proximal vertices 11 of the anchoring section 1 are located on the same vertex plane. The vertex plane can be inclined relative to the support axis, or it can be perpendicular to the support axis; no specific restriction is made here. Vertex 11 branches into right-hand spiral wires 111 of the anchoring section along a right-hand spiral direction and left-hand spiral wires 112 of the anchoring section along a left-hand spiral direction. The structure of the right-hand spiral wires 111 and the left-hand spiral wires 112 of the anchoring section can adopt... Figures 3a-3c Any one of the following. The weaving intersection formed when the right-hand spiral wire 111 and the left-hand spiral wire 112 of the anchoring section meet and intersect again is denoted as 12. The number of weaving intersections 12 is the same as the number of vertices 11, and they are evenly distributed circumferentially. Weaving intersections 12 can be formed using, for example... Figure 4b The fixed braided cross structure is shown. The right-hand spiral wire 111 and the left-hand spiral wire 112 of the anchoring section continue to move forward along the original spiral direction.
[0053] When the right-handed conical segment filament 21 branching off from the braiding intersection 12 in a right-handed helical direction and the left-handed conical segment filament 22 branching off in a left-handed helical direction meet and intersect again, they form a conical segment braiding intersection 23. The number of conical segment braiding intersections 23 in the circumferential direction of the support is the same as the number of braiding intersections 12 in the anchoring section, and they are evenly distributed circumferentially. The braiding structure of the conical segment braiding intersection 23 can be the same as the braiding structure of the braiding intersection 12 in the anchoring section, such as... Figure 4b As shown. The right-handed conical segment filament 21 and the left-handed conical segment filament 22 continue forward, extending to their respective splitting vertices 24, where they split into right-handed splitting filaments 241 branching out in the right-handed spiral direction and left-handed splitting filaments 242 branching out in the left-handed spiral direction. The number of splitting vertices 24 can be twice the number of weaving intersections 23 of the conical segment, and they are evenly distributed circumferentially. The weaving intersection formed when the right-handed splitting filament 241 and the left-handed splitting filament 242 first meet and intersect is denoted as 25. The weaving structure of weaving intersection 25 can employ a movable weaving crossover, such as... Figure 4a As shown, the tapered section 2 provides stronger radial support than traditional weaving methods, while also ensuring a smooth transition with the conforming section 3.
[0054] The compliant segment 3 is woven in the same way as the conical segment 2. The compliant segment 3 is formed by the right-handed compliant segment yarn 31 branching off from the weaving intersection 25 of the conical segment 2, and the left-handed compliant segment yarn 32 branching off from the right-handed spiral direction, continuing to be woven in a square two-way spiral pattern. That is, the right-handed compliant segment yarn 31 is an extension of the right-handed split yarn 241, and the left-handed compliant segment yarn 32 is an extension of the left-handed split yarn 242. When the right-handed compliant segment yarn 31 and the left-handed compliant segment yarn 32 meet and intersect, they form the compliant segment weaving intersection 33. The weaving structure of the compliant segment weaving intersection 33 is also a movable weaving intersection, such as... Figure 4a As shown, a movable cross weave refers to a cross weave structure where a left-handed yarn overlaps a right-handed yarn, or vice versa, with the crossover point forming a movable cross weave intersection. The cross weave intersections in section 3 are woven into a movable cross weave according to the same pattern.
[0055] Multiple openings can also be formed at the distal end of compliant segment 3. These openings include the braiding intersection 34, the right-handed opening yarn 341, and the left-handed opening yarn 342. (See also...) Figure 5a As shown, the braided wires at the braiding intersection 34 of the opening can be arranged in parallel and welded together. That is, two braided wires are arranged in parallel and welded to form a fixed braiding intersection 34. The braiding intersection 34 continues to extend spirally to produce an open right-handed wire 341 and an open left-handed wire 342. Please refer to... Figure 5b As shown, the braided threads at the braided intersection 34 of the opening can be interlaced and welded together. (See also...) Figure 5c As shown, the braided threads at the braiding intersection 34 of the opening can be staggered and movably connected, meaning that the braided threads at the braiding intersection 34 can move freely or be welded and fixed. It is understood that this embodiment does not impose excessive restrictions on the arrangement and connection method of the braided threads at the opening.
[0056] It should be noted that the braided yarn can be shape memory yarn, including but not limited to nickel-titanium alloy yarn.
[0057] It is worth mentioning that the braided wire of the venous stent includes at least one radiopaque wire. For example, there can be two radiopaque wires, namely a right-handed helical braided wire and a left-handed helical braided wire with radiopaque capabilities.
[0058] Please see Figure 6a As shown, the developing enhancement wire 13 may include: a hollow shape memory wire 131 and a developing inner core 132, with the developing inner core 132 disposed inside the hollow shape memory wire 131.
[0059] As an alternative example, please refer to Figure 6b As shown, the developing enhancement filament 13 may include: a shape memory filament 131, the outer wall of which is provided with a developing metal plating layer 132.
[0060] As another alternative example, please refer to Figure 6c As shown, the developing enhancement wire 13 may include shape memory composite wire 131 and developing metal composite wire 132, which are wound together to form the developing enhancement wire 13.
[0061] As another alternative example, please refer to Figure 6d As shown, the developing enhancement wire 13 may include shape memory composite wire 131 and developing metal composite wire 132, which are arranged in parallel to form the developing enhancement wire 13.
[0062] Developable metal materials include, but are not limited to, tantalum, platinum-iridium alloy, gold, etc.
[0063] The venous vascular stent of this invention, while possessing all the advantages of braided stents, also enables the support segment to have radial support performance that resists compression of the vascular compression site in the long term, avoiding long-term restenosis. At the same time, the conforming segment can meet the physical performance requirements of the vascular tortuosity or moving part, thereby preserving a more physiological anatomical shape of the blood vessel and meeting the physical performance requirements of different vascular sites for the stent.
[0064] Those skilled in the art will understand that the above embodiments are specific examples of implementing the present invention, and in practical applications, various changes in form and detail may be made without departing from the spirit and scope of the present invention.
Claims
1. A venous vascular stent, characterized in that, The venous stent is constructed by interlacing multiple braided filaments in both forward and reverse spirals, forming a stent structure capable of radial expansion and contraction. The venous stent includes a support segment and a compliant segment joined end-to-end. The radial compressive strength of the support segment is greater than that of the compliant segment. The stent includes multiple circumferentially and axially spaced braided intersections. The compressive strength of each braided filament in the support segment is greater than that of each braided filament in the compliant segment. The braided intersections in the support segment are fixed, while those in the compliant segment are movable. The braided intersections in the support segment employ a fixed braided cross structure, while those in the compliant segment employ a movable braided cross structure. The fixed braided cross structure includes: two cross strands, each cross strand including two sets of strands, any one of the two sets of strands forming a cross loop, and the cross loops of the two sets of strands intersecting each other to form the fixed braided cross structure; the movable braided cross structure includes: two cross strands, one of the two cross strands overlapping the other to form the movable braided cross structure; The compliant section is tapered, and the support section includes an anchoring section and a tapered section; the anchoring section, the tapered section, and the compliant section are connected sequentially along the axial direction; The diameter of the proximal end of the conical segment is larger than the diameter of the distal end of the compliant segment; Each braided filament of the anchoring section and the conical section contains multiple monofilaments. The distal end of the conical section contains multiple braided filament splitting vertices evenly distributed circumferentially. Each braided filament is split into N braided filaments at the splitting vertices. The split N braided filaments continue to be spirally interwoven to form the compliant section; N is a natural number greater than 1. The number of weaving intersections in the anchoring section is the same as the number of weaving intersections in the tapered section and they are evenly distributed circumferentially. The number of weaving intersections in the axial direction of the conforming section is the same and they are evenly distributed circumferentially.
2. The venous vascular stent according to claim 1, characterized in that, The proximal end of the anchoring section is flared, and the taper angle of the flared section is greater than 0° and less than 90°.
3. The venous vascular stent according to claim 1, characterized in that, The apex of the proximal end of the anchoring segment is located on the same vertex plane, and the vertex plane is inclined or perpendicular to the axis of the venous stent.
4. The venous vascular stent according to claim 1, characterized in that, N equals 2.
5. The venous vascular stent according to claim 1, characterized in that, At least one weaving intersection at the outer end of the compliant section continues to extend spirally and form an opening.
6. The venous vascular stent according to claim 1, characterized in that, The woven intersections at the outer ends of the conforming sections all continue to spirally extend to form openings.
7. The venous vascular stent according to claim 6, characterized in that, The braided threads at the intersection of the braids in the opening are arranged in parallel and welded together; or The braided threads at the intersection of the braids in the opening are interlaced and welded together; or The braided threads at the intersection of the openings are interlaced and movably connected.
8. The venous vascular stent according to any one of claims 1 to 7, characterized in that, The braided yarn includes at least one developer-enhancing yarn with developer-developing capability; The developing enhancement filament includes: a hollow-shaped memory filament and a developing inner core, wherein the developing inner core is disposed within the hollow-shaped memory filament; or The developing enhancement filament includes: a shape memory filament, the outer wall of which is provided with a developing metal coating; or The developing enhancement wire includes: shape memory composite wire and developing metal composite wire, which are wound or arranged in parallel to form the developing enhancement wire.
9. The venous vascular stent according to claim 8, characterized in that, The developing and reinforcing filament consists of two strands.