Axial interaction stent and preparation method thereof

Abstract

The invention relates to an axial interaction stent, which comprises a stent main body, the stent main body comprises a first knitting unit arranged along a first knitting direction and a second knitting unit arranged along a second knitting direction, and the knitting units in two adjacent directions are mutually interwoven in pairs to form a hollow cylinder structure, after the first knitting unit and the second knitting unit are interwoven in the axial direction of the stent body, the first knitting unit and the second knitting unit can be screwed in the axial direction of the stent body to form a special axial interaction structure, and the first knitting unit and the second knitting unit are interwoven and screwed mutually. The stent body with high flexibility and adaptability can be manufactured, after the first weaving unit and the second weaving unit are interwoven and screwed, due to the change of the screwing angle, the first weaving unit and the second weaving unit can continue to be woven in the original weaving direction and can also be woven in the weaving direction, and it is ensured that the stent body can be tightly attached to the inner wall of a blood vessel after being implanted; and the risk of displacement or sliding is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to an axially interactive stent and a preparation method thereof. Background Art

[0002] Minimally invasive interventional surgery is a common treatment for aneurysms. Currently, commonly used treatment techniques for aneurysms include coil packing, stent-assisted coil packing, blood flow diversion device placement, covered stent implantation and other methods. The adhesion of the stent to the wall is particularly important for the immediate and medium- and long-term treatment effects of the lesion site. Poor adhesion of the stent body to the wall can easily lead to stent stenosis and acute thrombosis. Insufficient circumferential rigidity of the stent body can easily lead to poor opening effect when it is released from the lumen, which directly affects the subsequent adhesion effect of the stent body, and the immediate treatment effect of the operation is not ideal. Summary of the invention

[0003] In view of this, the present application proposes an axially interactive stent and a preparation method thereof to increase rigidity and improve the wall adhesion ability of the stent body.

[0004] According to one aspect of the present application, there is provided an axially interactive stent, comprising: a stent body;

[0005] The stent body comprises a first weaving unit arranged along a first weaving direction, and a second weaving unit arranged along a second weaving direction, wherein the weaving units in the two directions are alternately distributed along a circumferential direction, interweaving with each other to generate interweaving points, and forming a hollow column structure;

[0006] Any adjacent first weaving unit and second weaving unit continue to be twisted along the axial direction of the stent body at the same weaving point generated after weaving to form an axial interactive structure. The first weaving unit and the second weaving unit are woven along the original weaving direction or woven in an alternate weaving direction.

[0007] In a possible implementation manner, the twisting direction of the adjacent first weaving units and the second weaving units is clockwise or counterclockwise.

[0008] In a possible implementation, a twisting angle between the first braiding unit and the second braiding unit is α;

[0009] α=n*180°, 1≤n≤10.

[0010] In a possible implementation, the first braiding unit and the second braiding unit are interwoven to produce an interwoven point and then continue to be twisted to form an axially interactive structure;

[0011] The axial interactive structure is arranged along the circumference and axial direction of the bracket body.

[0012] In a possible implementation, after the adjacent first weaving unit and the second weaving unit are interwoven to generate an interweaving point, when n is an odd number when the twisting is continued, the first weaving unit and the second weaving unit exchange weaving directions after forming an axially interactive structure and before generating the next interweaving point.

[0013] When n is an even number when the adjacent first weaving unit and the second weaving unit continue to twist after they are interwoven to produce an interweaving point, the first weaving unit and the second weaving unit continue to weave along the original weaving direction after forming an axial interactive structure and before producing the next interweaving point.

[0014] In a possible implementation, the first braiding unit and the second braiding unit are composited by a single wire or multiple wires;

[0015] The first braiding unit and the second braiding unit may be in various forms and structures such as springs, strands, ropes, etc.;

[0016] The cross sections of the first weaving unit and the second weaving unit are circular, hollow or any other shapes.

[0017] In a possible implementation, the number of the weaving units is 2m, where m≥4, and m is a positive integer.

[0018] In one possible implementation, the number of axial interaction structures in the circumferential direction at the same axial position of the stent body is 1≤a≤m, where a is a positive integer, forming a circumferential interaction group, and the axial interaction structures in the circumferential interaction group have the same or different screwing directions and screwing angles.

[0019] In a possible implementation, there is a preset distance Li between two adjacent circumferentially interactive groups, where Li=x*p, p is the braided layer pitch, and x>0;

[0020] The preset distances Li between any adjacent circumferential interaction groups are the same or different.

[0021] In a possible implementation, two ends of the bracket body are in a trumpet-mouth structure.

[0022] In a possible implementation, the end of the stent body is a loose structure, a partially closed structure, or a fully closed structure.

[0023] In one possible implementation, the end of the stent body can be formed into a partially closed or fully closed structure by winding, bundled wire collection, or by mechanical clamping, welding, cylindrical hollow tube or C-ring fixing braiding unit.

[0024] In a possible implementation, the ends of the end closing structure of the stent body may be flush or arranged in staggered layers.

[0025] In a possible implementation, when the end portion of the stent body is bundled and gathered, a partially closed gathering structure or a fully closed gathering structure may be formed;

[0026] In a possible implementation, when the end of the stent body is bundled and gathered to form a partially closed or fully closed gathering structure, the total wire heads w involved in the weaving are first divided into n braided wire groups, and the number of wire heads in each braided wire group is w / n, and n can be 3, 4, 6, 8, 10, or 12;

[0027] The ε group is further divided into two bundles, where ε is a natural number greater than 0, ε≤η;

[0028] The two equally divided bundles of braided yarns rotate in the same direction or in opposite directions to form a stable yarn bundle, and then the two yarn bundles are bound together in parallel to form a yarn collection group.

[0029] In one possible implementation, the braiding unit contains a material with shape memory properties such as nickel titanium, cobalt chromium, or a metal wire containing a radiopaque component, or is a composite of wires of different materials, and the stent body is woven from one or more braiding units.

[0030] In a possible implementation, the outer diameter of the stent body ranges from 1.5 to 12 mm, and the length ranges from 10 to 80 mm.

[0031] In a possible implementation, the stent body may be woven from weaving units with one wire diameter or multiple wire diameters.

[0032] A preparation method, used for the above-mentioned axially interactive stent preparation method, comprising the following steps:

[0033] The first weaving unit and the second weaving unit are arranged to be weaved at intervals;

[0034] After two adjacent braiding units with different braiding directions are braided to produce a braiding point, they are twisted along the axial direction of the stent body at the same braiding point;

[0035] The first braiding unit and the second braiding unit are interwoven with each other and twisted after being interwoven to form a hollow column structure;

[0036] The support body is heat treated to be shaped.

[0037] The beneficial effects of the axially interactive stent of the embodiment of the present application are as follows: the axially interactive structure on the stent body can enhance the rigidity of the area, thereby improving the adhesion between the stent body and the blood vessel wall, ensuring that the stent body can fit closely to the inner wall of the blood vessel after implantation, and reducing the risk of displacement or sliding. In addition, these axially interactive structures are not randomly distributed, but are arranged at intervals along the axial direction of the stent body according to a certain rule. While improving the wall adhesion ability of the stent body, it also optimizes the overall flexibility of the stent body, so that it can still maintain good compliance and wall adhesion when facing tortuous and complex blood vessel structures, ensuring the effectiveness and safety of the treatment. The multiple interactive points where the first braiding units and the second braiding units are twisted form multiple circumferential interactive group structures, which enhance the rigidity of the stent body in the circumferential direction of the stent body, and provide strong support for the stent body to be released from the lumen and opened smoothly.

[0038] Other features and aspects of the present application will become apparent from the following detailed description of exemplary embodiments with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments, features, and aspects of the present application and, together with the description, serve to explain the principles of the present application.

[0040] Figure 1 A schematic diagram showing the main structure of the axially interactive bracket according to an embodiment of the present application;

[0041] Figure 2 An enlarged schematic diagram showing the untwisted braided units of the axially interactive stent according to an embodiment of the present application;

[0042] Figure 3 A schematic diagram showing the axial distribution of the braided units of the axially interactive stent according to an embodiment of the present application;

[0043] Figure 4 A schematic diagram showing a forming process of an axially interactive structure of an axially interactive bracket according to an embodiment of the present application;

[0044] Figure 5 Schematic diagrams of weaving interactions of the axially interactive stent of the embodiment of the present application with (a) α=180° and (b) α=360°;

[0045] Figure 6 A schematic diagram showing the structural features of a closed wire collection group of an axially interactive stent according to an embodiment of the present application;

[0046] Figure 7 A schematic diagram showing the closed wire collection connection and fixation of the axially interactive stent according to an embodiment of the present application is shown;

[0047] Figure 8A schematic diagram showing a fully enclosed end beam-splitting and tailing structure of an axially interactive bracket according to an embodiment of the present application is shown;

[0048] Fig. 9 A schematic diagram showing a fully enclosed winding structure of the end of the axially interactive bracket according to an embodiment of the present application;

[0049] Fig.10 A schematic diagram showing the staggered arrangement of the braided layer end closed structure of the axially alternating stent according to an embodiment of the present application is shown;

[0050] Fig.11 A schematic diagram showing a main structure embodiment 1 of the axially interactive bracket of the present application embodiment;

[0051] Fig.12 A schematic diagram showing a main structure embodiment 2 of the axially interactive bracket of an embodiment of the present application;

[0052] Fig.13 A schematic diagram of Embodiment 4 of the main structure of the axially interactive support according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0053] Various exemplary embodiments, features and aspects of the present application will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0054] Among them, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention or simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0055] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0056] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0057] In addition, in order to better illustrate the present application, numerous specific details are given in the following specific embodiments. It should be understood by those skilled in the art that the present application can also be implemented without certain specific details. In some examples, methods, means, components and circuits well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present application.

[0058] like Figure 1 and Figure 2 As shown, the axially interactive stent of the embodiment of the present application includes: a stent body 100, the stent body 100 includes a first weaving unit 110 arranged along a first weaving direction, and a second weaving unit 120 arranged along a second weaving direction, the weaving units in the two directions are alternately distributed along the circumferential direction, and the interlacing points are interlaced to form a hollow column structure, and any adjacent first weaving unit 110 and second weaving unit 120, after the same interlacing point generated after interlacing continues to be twisted along the axial direction of the stent body, after forming an axial interactive structure, the first weaving unit 110 and the second weaving unit 120 are woven along the original weaving direction or along the weaving direction of another weaving unit, so that the first weaving unit 110 and the second weaving unit 120 are interwoven and twisted to construct a hollow column structure with high flexibility and adaptability. Specifically, after twisting, the first weaving unit 110 and the second weaving unit 120 can choose to continue weaving along their original weaving direction, or can choose to weave along the weaving direction of another weaving unit, giving the stent body more excellent elasticity and adaptability.

[0059] In this embodiment, the axial interaction structure 130 on the stent body 100 can enhance the rigidity of the area, thereby improving the adhesion between the stent body and the blood vessel wall, ensuring that the stent body can be closely attached to the inner wall of the blood vessel after implantation, and reducing the risk of displacement or sliding. In addition, these axial interaction structures 130 are not randomly distributed, but are arranged at intervals along the axial direction of the stent body according to a certain rule. While improving the wall adhesion ability of the stent body, it also optimizes the overall flexibility of the stent body, so that it can still maintain good compliance and wall adhesion when facing tortuous and complex blood vessel structures, ensuring the effectiveness and safety of the treatment. The axial interaction structures 130 twisted by the multiple first weaving units 110 and the second weaving units 120 form multiple circumferential interaction group structures, which enhance the rigidity of the stent body in the circumferential direction of the stent body 100, and provide strong support for the stent body to be released from the lumen and opened smoothly.

[0060] In one specific embodiment, Figure 2 and Figure 3As shown, the twisting direction of the adjacent first weaving unit 110 and the second weaving unit 120 is clockwise or counterclockwise. When the first weaving unit 110 and the second weaving unit 120 form the stent body 100, their twisting directions have clear characteristics, that is, they can be clockwise or counterclockwise. By selecting different twisting directions, the internal structure and mechanical properties of the stent body can be adjusted to meet specific application requirements. Whether it is clockwise or counterclockwise twisting, it can ensure that the first weaving unit 110 and the second weaving unit 120 are closely interwoven to form a stable and reliable stent body structure.

[0061] It should be noted that the first weaving unit 110 and the second weaving unit twisted with each other are woven in a 1-on-1 manner, so the first weaving unit 110 is overlapped on the second weaving unit 120, or the second weaving unit 120 is overlapped on the first weaving unit 110. Therefore, when the first weaving unit 110 is overlapped on the second weaving unit 120, the first weaving unit 110 will be relatively opened with the second weaving unit 120 when rotated 180 degrees counterclockwise, and the first weaving unit 110 will overlap with the second weaving unit 120, and the first weaving unit 110 and the second weaving unit 120 will be twisted to form an axial interaction structure 130 when the first weaving unit 110 is overlapped on the second weaving unit 120 and rotated 180 degrees clockwise, the first weaving unit 110 and the second weaving unit 120 knobs form an axial interaction structure 130.

[0062] Further, in this specific embodiment, if Figure 2 and Figure 5 As shown, the twisting angle between the first weaving unit 110 and the second weaving unit 120 is α, α=n*180°, 1≤n≤10.

[0063] Among them, n is the number of knob turns of the first weaving unit 110 and the second weaving unit 120. During the weaving process of the stent body 100, the single twisting number of the axial interaction structure 130 is about 1-3 times, which avoids excessive rigidity of the first weaving unit 110 and the second weaving unit 120 at the interaction position, affecting the overall rigidity and opening degree of the stent body.

[0064] In one specific embodiment, Figure 1-Figure 5As shown, the first braiding unit 110 and the second braiding unit 120 are interwoven to produce interwoven points and then continue to twist and interweave to form an axial interactive structure 130. The axial interactive structure 130 is arranged along the circumference and axial direction of the stent body. Multiple axial interactive structures 130 are formed by twisting along the circumference and axial direction of the stent body. In the circumferential direction, the axial interactive structure 130 can ensure that the annular structure of the stent body is stably maintained and effectively resist the radial pressure from the blood vessel wall. In the axial direction, the axial interactive structure 130 enhances the longitudinal continuity of the stent body, so that it can better adapt to the bending and stretching of the blood vessel.

[0065] In one specific embodiment, Figure 4 and Figure 5 As shown, the first weaving unit 110 is overlapped on the second weaving unit 120. When rotated 180 degrees clockwise, the knobs of the first weaving unit 110 and the second weaving unit 120 form an axial interactive structure 130. When the weaving times of the first weaving unit 110 and the second weaving unit 120 are odd, after the first weaving unit 110 and the second weaving unit 120 are twisted, the first weaving unit 110 is weaved along the weaving direction and trajectory of the second weaving unit 120, and the second weaving unit 120 is weaved along the weaving direction and trajectory of the first weaving unit 110.

[0066] Among them, the first weaving unit 110 is overlapped on the second weaving unit 120. When it is rotated 180 degrees clockwise, the knobs of the first weaving unit 110 and the second weaving unit 120 form an axial interactive structure 130. When the weaving times of the first weaving unit 110 and the second weaving unit 120 are even, after the first weaving unit 110 and the second weaving unit 120 are twisted, the first weaving unit 110 is weaved along the original weaving direction and trajectory, and the second weaving unit 120 is weaved along the original weaving direction and trajectory.

[0067] In one specific embodiment, the first braiding unit 110 and the second braiding unit 120 are composed of a single or multiple wires. When a single wire is used for braiding, the stent body may show more delicate and soft characteristics, which is suitable for application scenarios requiring high compliance. When multiple wires are used for braiding, the structural strength and stability of the stent body can be significantly improved, making it more suitable for environments that withstand greater pressure or require higher support.

[0068] In one specific embodiment, the first weaving unit 110 is arranged in parallel, or in advance or during the weaving process, a spring, strand or rope structure is formed by twisting, spring winding, etc. In the twisting process, a single or multiple wires are tightly wound and twisted to form a spring structure with significant elasticity and restoring force, which gives the first weaving unit 110 excellent flexibility and shape memory. The spring winding process further enhances the stability and durability of the structure, so that the first weaving unit 110 can maintain the integrity of the shape and the continuity of the function when subjected to external forces. In addition, the formation of a rope-like or strand-like structure improves the tensile strength and wear resistance of the first weaving unit 110.

[0069] The number of braiding wires in the second braiding unit 120 is the same as that in the first braiding unit 110 .

[0070] In one specific embodiment, Figure 1 As shown, the stent body is a straight section structure, and the stent body maintains a straight or nearly straight extension in the length direction, without significant bending or curvature changes. The straight section structure of the stent body allows the stent end to more easily adapt to and fit the target area, such as blood vessels and lumens, during installation and use, providing a more precise and reliable support effect.

[0071] Furthermore, in this specific embodiment, the support body with a straight section structure is easy to manufacture and process, which reduces production costs and also helps to improve product quality and consistency.

[0072] In one specific embodiment, see Figure 6-Figure 10 The two ends of the stent body are in a trumpet-shaped structure, which gives the stent body better adaptability and functionality. The trumpet-shaped structure gradually expands from the stent body to the circumferential direction of the two ends of the stent, and extends axially at the same time. The trumpet-shaped structure at the end of the stent has a good opening effect at the moment of release, which is helpful for the subsequent release and opening of the stent body; after the stent body is fully deployed, the trumpet-shaped structure has a good anchoring effect and can be closely attached to the blood vessel wall or other biological structures, providing a more stable support effect, which helps to prevent the stent body from shifting or falling off.

[0073] In one specific embodiment, the number of the first weaving units 110 and the number of the second weaving units 120 are both 2m, where m≥4 and m is a positive integer.

[0074] In one specific embodiment, the number of axial interaction structures in the circumferential direction at the same axial position of the stent body is 1≤a≤m, where a is a positive integer, forming a circumferential interaction structure 130, and the screwing direction and screwing angle thereof are the same or different.

[0075] In one specific embodiment, there is a preset distance Li between two adjacent circumferentially interactive groups, where Li=x*p, p is the pitch of the braided layer, and x>0. The preset distance Li between any adjacent circumferentially interactive groups is the same or different.

[0076] In one specific embodiment, two ends of the bracket body 100 are in a bell-mouth structure.

[0077] In one specific embodiment, the end of the stent body is a loose structure, a partially closed structure or a fully closed structure.

[0078] Among them, the weaving of the two ends of the bracket body 100 includes the following steps: when weaving starts or ends, the total wire heads w involved in the weaving are first divided into η weaving wire groups, the number of wire heads in each weaving wire group is w / η, η can be 3, 4, 6, 8, 10, 12, and the ε group is further divided into two bundles, ε is a natural number greater than 0, ε≤η, and the two equally divided bundles of weaving wires rotate in the same direction or opposite directions to form a stable wire bundle, and then the two bundles of wires are tied together in parallel to form a wire collection group.

[0079] Furthermore, in this specific embodiment, the wire collection group of the bracket body 100 can be fixed by welding.

[0080] In one specific embodiment, the end of the stent body 100 contains X-ray-opaque precious metal hollow tubes, the number of which is ε. The precious metal hollow tubes can be connected to the braided wire by bonding, welding or mechanical crimping, including cylindrical hollow tubes or C-shaped rings.

[0081] In one specific embodiment, the end of the stent body 100 may adopt a full-winding or partial-winding structure design, and the w braided wires are divided into w / 2 groups, and two adjacent braided wires with inconsistent rotation directions form a winding group.

[0082] In one specific embodiment, the wire collection group and the rewinding group can be distributed in staggered layers.

[0083] In one specific embodiment, the first braided unit 110 and the second braided unit 120 are both made of materials containing nickel-titanium and cobalt-chromium with shape memory properties, or are metal wires containing radiopaque components, or are a mixed braid of braided units of different materials.

[0084] In one specific embodiment, the outer diameter of the stent body ranges from 1.5 to 12 mm, and the length ranges from 10 to 80 mm.

[0085] In one specific embodiment, the braiding unit of the stent body can be a single wire diameter or a mixture of multiple wire diameters.

[0086] A preparation method for an axially interactive stent comprises the following steps:

[0087] S100, the first weaving unit 110 and the second weaving unit 120 are arranged to weave alternately;

[0088] In this step, the first weaving unit 110 and the second weaving unit 120 are interwoven to form a stent body.

[0089] S200, after two adjacent braiding units with different braiding directions are braided to generate a braiding point, they are twisted along the axial direction of the stent body at the same braiding point;

[0090] In this embodiment, the stent body includes a regular braiding structure and a special axial interaction structure 130. The axial interaction structure 130 is regularly arranged at the stent body 100 so as to be distributed among the regular braiding structures to optimize the overall mechanical properties and performance of the stent body.

[0091] S300, the first weaving unit 110 and the second weaving unit 120 are interwoven and twisted to form a hollow column structure;

[0092] In this step, during the axial weaving process of the first weaving unit 110 and the second weaving unit 120 along the stent body, some adjacent first weaving units 110 and second weaving units 120 are twisted to form an axial interactive structure 130, and continue to be woven into a hollow columnar structure.

[0093] S400, heat treatment and shaping of the bracket body;

[0094] In this step, the stent body 100 is firstly braided, and then the stent body 100 is heat-treated and shaped, so as to obtain a braided stent body having a special axial interactive structure 130 with certain mechanical properties.

[0095] According to the above embodiments, embodiment 1:

[0096] like Fig.11As shown, the braiding units of the stent body are all single metal wires, which are mixed with metal wires of two wire diameters in a ratio of 1:1, wherein the ratio of nickel-titanium wire to platinum wire is 3:1, and the stent body 100 includes three kinds of interaction groups, and the intervals between adjacent interaction groups are all p / 4, where p is the pitch of the braiding unit; interaction group A includes four axial interaction structures 130, α=180 degrees; interaction group B includes two axial interaction structures 130, α=360 degrees; interaction group C includes two axial interaction structures 130, α=180 degrees; the ratio of group A, group B and group C is 2:1:1, and they are arranged in the axial direction of the stent body in the order of ABAC, wherein the projections of the axial interaction structures 130 of group B and group C in the circumferential direction of the stent body overlap, and all axial interaction structures 130 are evenly distributed along the circumferential direction and axial direction of the stent body.

[0097] Embodiment 2:

[0098] like Fig.12 As shown, in one embodiment, the stent body has a total of 64 braiding units, one of which is a strand of 3 platinum wires twisted together, and the remaining braiding units are all cobalt-chromium alloys. The stent body 100 includes 2 kinds of interaction groups, and the intervals between adjacent interaction groups are p / 3, where p is the pitch of the braiding unit; interaction group A includes 4 axial interaction structures 130, α=180 degrees; interaction group B includes 2 axial interaction structures 130, α=180 degrees; the ratio of group A to group B is 1:1, and they are arranged in the axial direction of the stent body in the order of AB, and all axial interaction structures 130 are evenly distributed along the circumferential direction and axial direction of the stent body.

[0099] Embodiment 3:

[0100] like Figure 1 As shown, in one embodiment, the stent body is woven from 16 braiding units, the ends of which are closed winding structures and trumpet-mouth structures, and an X-ray-proof metal ring is arranged at the winding of the braiding unit. The braiding units of the stent body are all single metal wires, wherein the ratio of nickel-titanium wire to platinum wire is 3:1, and the stent body 100 includes two kinds of interaction groups, interaction group A includes four axial interaction structures 130, α=180 degrees; interaction group B includes two axial-axial interaction structures 130, α=180 degrees; the interaction groups are arranged axially at intervals in the order of ABA in the stent body, and are respectively located at 1 / 4, 2 / 4, and 3 / 4 of the stent body, wherein the projection of the axial interaction structure 130 of group A in the circumferential direction of the stent body overlaps, and does not overlap with the projection of group B, and all the axial interaction structures 130 of the stent body are evenly distributed along the circumferential direction and axial direction of the stent body.

[0101] Embodiment 4:

[0102] like Fig.13As shown, in one embodiment, the stent body has two braided units as developing wires, and its structure is: one platinum wire is used as the core wire, and the remaining two platinum wires are arranged in parallel to form a core spring with the core wire as the center, and the axial interactive structure 130 is formed by twisting these two core springs along the axial direction of the stent body, and the remaining braided units are all cobalt-chromium alloys. The stent body 100 includes two kinds of interactive groups, and the intervals between adjacent interactive groups are p / 2, where p is the pitch of the braided unit; the interactive group A includes two axial interactive structures 130, α1=180 degrees, α2=360 degrees; the interactive group B includes two axial axial interaction structure 130, α3=180 degrees, α4=360 degrees; the ratio of group A to group B is 1:1, and they are arranged axially in the order of AB in the bracket body. At the same circumferential position, the two axial interaction structures 130 are arranged at intervals, wherein the projections of the axial interaction structure 130 with α1=180 degrees in group A and the axial interaction structure 130 with α4=360 degrees in group B in the circumferential direction of the bracket body overlap, and the projections of the axial interaction structure 130 with α2=360 degrees in group A and the axial interaction structure 130 with α3=180 degrees in group B in the circumferential direction of the bracket body overlap.

[0103] Embodiment 5:

[0104] In one embodiment, all braided units are nickel-titanium-platinum core wires, all interactive groups contain only one axial interactive structure 130, and the axial interactive structure 130 is spirally distributed along the stent body. The intervals between adjacent interactive groups are p / 3, where p is the pitch of the braided unit.

[0105] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. An axially interactive bracket, characterized in that: include: The support body; The stent body comprises a first weaving unit arranged along a first weaving direction, and a second weaving unit arranged along a second weaving direction, wherein the weaving units in the two directions are alternately distributed along a circumferential direction, interweaving with each other to generate interweaving points, and forming a hollow column structure; Any adjacent first weaving unit and second weaving unit continue to be twisted along the axial direction of the stent body at the same weaving point generated after weaving to form an axial interactive structure. The first weaving unit and the second weaving unit are woven along the original weaving direction or woven in an alternate weaving direction.

2. The axially interactive bracket according to claim 1, characterized in that: The twisting direction of the adjacent first braiding units and the second braiding units is clockwise or counterclockwise.

3. The axially interactive bracket according to claim 2, characterized in that: The twisting angle between the first braiding unit and the second braiding unit is α; α=n*180°, 1≤n≤10.

4. The axially interactive bracket according to any one of claims 1 to 3, characterized in that: The first braiding unit and the second braiding unit are interwoven to produce an interwoven point and then continue to be twisted to form an axially interactive structure; The axial interactive structure is arranged along the circumference and axial direction of the bracket body.

5. The axially interactive bracket according to claims 1-4, characterized in that: The adjacent first weaving unit and the second weaving unit, after interweaving to generate an interweaving point, continue to twist when n is an odd number, the first weaving unit and the second weaving unit exchange weaving directions after forming an axially interactive structure and before generating the next interweaving point; When n is an even number when the adjacent first weaving unit and the second weaving unit continue to twist after they are interwoven to produce an interweaving point, the first weaving unit and the second weaving unit continue to weave along the original weaving direction after forming an axial interactive structure and before producing the next interweaving point.

6. The axially interactive bracket according to any one of claims 1 to 3, characterized in that: The first braiding unit and the second braiding unit are composed of a single wire or a plurality of wires; The first braiding unit and the second braiding unit may be in various forms and structures such as springs, strands, ropes, etc.; The cross sections of the first weaving unit and the second weaving unit are circular, hollow or any other shapes.

7. The axially interactive bracket according to claim 1, characterized in that: The number of the weaving units is 2m, where m≥4 and m is a positive integer.

8. The axially interactive bracket according to claim 7, characterized in that: The number of the axial interaction structures in the circumferential direction at the same axial position of the stent body is 1≤a≤m, where a is a positive integer, forming a circumferential interaction group. The axial interaction structures in the circumferential interaction group have the same or different screwing directions and screwing angles.

9. The axially interactive bracket according to claim 8, characterized in that: There is a preset distance Li between two adjacent circumferentially interactive groups, where Li=x*p, p is the braided layer pitch, and x>0; The preset distances Li between any adjacent circumferential interaction groups are the same or different.

10. The axially interactive bracket according to claims 1-3, characterized in that: The two ends of the bracket body are in a trumpet-mouth structure.

11. The axially interactive bracket according to any one of claims 1 to 3, characterized in that: The end of the bracket body is a loose structure, a partially closed structure, or a fully closed structure.

12. The axially interactive bracket according to claim 11, characterized in that: The end of the stent body can be formed into a partially closed or fully closed structure by winding, bundle-forming, or by mechanical clamping, welding, cylindrical hollow tube or C-ring fixing braiding unit.

13. The axially interactive bracket according to claim 12, characterized in that: The ends of the end closing structure of the stent body can be flush or arranged in staggered layers.

14. The axially interactive bracket according to claims 11-13, characterized in that: When the end portion of the stent body is bundled and gathered, a partially closed wire-gathering structure or a fully closed wire-gathering structure can be formed.

15. The axially interactive bracket according to claim 14, characterized in that: When the end of the stent body forms a partially closed or fully closed wire collection structure by bundled wire collection, the total wire heads w involved in the weaving are first divided into n braided wire groups, and the number of wire heads in each braided wire group is w / n, and n can be 3, 4, 6, 8, 10, or 12; The ε group is further divided into two bundles, where ε is a natural number greater than 0, ε≤η; The two equally divided bundles of braided yarns rotate in the same direction or in opposite directions to form a stable yarn bundle, and then the two yarn bundles are bound together in parallel to form a yarn collection group.

16. The axially interactive bracket according to any one of claims 1 to 3, characterized in that: The braided unit is made of materials with shape memory properties such as nickel titanium, cobalt chromium, etc., or is a metal wire containing a radiopaque component, or is a composite of wires of different materials. The stent body is woven from one or more braided units.

17. The axially interactive bracket according to claim 16, characterized in that: The outer diameter of the stent body ranges from 1.5 to 12 mm, and the length ranges from 10 to 80 mm.

18. The axially interactive bracket according to claim 17, characterized in that: The stent body can be woven from weaving units with one wire diameter or multiple wire diameters.

19. A preparation method for the axially interactive stent preparation method according to any one of claims 1 to 18, characterized in that: The steps include: The first weaving unit and the second weaving unit are arranged to be weaved at intervals; After two adjacent braiding units with different braiding directions are braided to produce a braiding point, they are twisted along the axial direction of the stent body at the same braiding point; The first braiding unit and the second braiding unit are interwoven with each other and twisted after being interwoven to form a hollow column structure; The support body is heat treated to be shaped.

Images