Internally and externally staggered double-layer woven stent

Abstract

The double-layer woven stent comprises a woven main body, the woven main body is of a hollow cylinder structure and at least comprises a woven outer layer and a woven inner layer, the woven outer layer is formed by weaving multiple strands of woven outer wires, the woven inner layer is formed by weaving multiple strands of woven inner wires, and the woven mode is the same as that of the woven outer layer; the weaving inner threads and the weaving outer threads are arranged on different planes in a staggered mode, at least one weaving inner thread of the weaving inner layer and at least one weaving outer thread of the adjacent weaving outer layer are woven in a crossed mode, and the weaving inner threads are woven along an original weaving path or a weaving path of the weaving outer threads. The potential stent layering risk of the double-layer woven stent which is arranged in a staggered mode inside and outside is reduced, by changing an original line pressing structure, the deformation resisting capacity near interlayer connecting points is improved, the woven wires which displace due to friction force near the interlayer connecting points can be driven to rapidly return to the original positions, and the risk of local stent layering is resisted.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to a double-layer braided stent with alternating inner and outer layers and its braiding method. Background Technology

[0002] Minimally invasive interventional surgery is a common treatment for intracranial aneurysms. Currently, commonly used techniques for intracranial aneurysms include coil embolization, covered stent implantation, stent-assisted coil embolization, and flow diverter placement. For large and giant saccular aneurysms, wide-necked aneurysms, fusiform aneurysms, and dissecting aneurysms, the surgical procedure is complex, with high rates of intraoperative and postoperative complications and recurrence. Therefore, traditional coil or stent-assisted coil embolization techniques are often time-consuming, and complete closure of the aneurysm neck is difficult, resulting in incomplete aneurysm occlusion. Covered stents are generally unsuitable for tortuous vessels and are difficult to place, especially in areas with siphon bends or higher. Flow diverters, placed at the aneurysm neck, first reduce the impact of blood flow on the aneurysm wall by altering the direction of blood flow within the parent artery. Ultimately, this leads to the formation of new endothelial cells on the stent surface and at the aneurysm neck, achieving complete occlusion and healing of the aneurysm, as well as reconstruction of the parent artery. In comparison, flow diverters are more suitable for these types of conditions. The shortening of flow diverters is usually quite long, which places high demands on the surgeon's placement and positioning skills. This is because the tight sealing of the aneurysm neck is crucial for aneurysm treatment. The emergence of double-layered braided stents with alternating inner and outer layers has greatly helped to reduce the shortening of braided stents, reduce the difficulty of placing and positioning flow diverters, and shorten the operation time.

[0003] Ordinary double-layer braided stents with interlocking internal and external structures are subject to external forces such as compression, pushing, and stretching during assembly, delivery, and release, making them prone to interlayer separation. The root cause is that the braided stent is made up of two sets of braided filaments with different directions of rotation. Since the two layers of the stent are not smooth planes, the presence of friction causes the displacement of the braided filaments after being subjected to force to not be recovered in time, resulting in delamination of the two layers of the stent. At the same time, the uniformity of the stent's mesh will also decrease, affecting the treatment effect. Summary of the Invention

[0004] In view of this, this application proposes a double-layer braided support with alternating inner and outer layers and its braiding method, so as to avoid the phenomenon of layer separation in the double-layer braided support with alternating inner and outer layers.

[0005] According to one aspect of this application, a double-layered braided support with alternating inner and outer layers is provided, comprising: a braided body;

[0006] The woven body is a hollow cylindrical structure, comprising at least an outer woven layer and an inner woven layer;

[0007] The outer woven layer and the inner woven layer are coaxially arranged;

[0008] The woven outer layer is made of multiple strands of woven outer yarn;

[0009] The inner braided layer is woven from multiple strands of inner braided yarn, and the braiding method is the same as that of the outer braided layer. The inner and outer braided yarns are interlaced on different planes.

[0010] At least one inner braided yarn of the inner braided layer is cross-braided with at least one outer braided yarn of the adjacent outer braided layer, and the inner braided yarn is braided along the original braiding path or along the braiding path of the outer braided yarn.

[0011] In one possible implementation, the braided filament is a single filament or multiple filaments, which are formed in advance or during the weaving process by means of twisting, coiling, or other methods to form a spring, strand, or rope structure.

[0012] In one possible implementation, the angle formed between the braided inner yarn and the braided outer yarn along the support axis is in the range of 20 degrees to 180 degrees.

[0013] In one possible implementation, the inner braided yarn and the outer braided yarn are interwoven, rotating in a clockwise or counterclockwise direction to form an interlayer connection point.

[0014] In one possible implementation, the support has at least one interlayer connection point in the circumferential direction at the same axial position.

[0015] In one possible implementation, the interlayer connection points are spaced apart along the axial direction of the support.

[0016] In one possible implementation, the diameter of both the inner braided yarn and the outer braided yarn is in the range of 20 micrometers to 100 micrometers.

[0017] In one possible implementation, the two ends of the braided yarn of the connecting strand are a loose structure, a partially closed winding structure, or a fully closed winding structure.

[0018] In one possible implementation, the end of the braided body is fitted with a hollow tube of precious metal that is opaque to X-rays.

[0019] In one possible implementation, the ends of the braided body are fully or partially wound back, and adjacent braided yarns with different directions of rotation form a wound group;

[0020] Both the take-up group and the rewinding group can be staggered.

[0021] The beneficial effects of the interlocking double-layer braided stent in this application embodiment are as follows: The stent body contains a special braided structure, which, while ensuring high radial support, high metal coverage, low shortening rate, and better blood flow guidance, greatly reduces the potential risk of stent delamination. This offers certain advantages for clinical use in treating hemorrhagic aneurysms. Specifically, by rotating and interlacing the braided strands at the connecting strands of the stent, the resistance to deformation near the interlayer connection points is increased. After external force is applied, these interlayer connection points, due to their high rigidity, can quickly restore the braided strands that have been displaced by friction near the interlayer connection points to their original positions, resisting the risk of local stent delamination. Furthermore, the interlayer connection groups distributed throughout the interlocking double-layer braided stent further increase the overall resistance to delamination of the stent.

[0022] Other features and aspects of this application will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0023] The accompanying drawings, which are included in and form part of this specification, illustrate exemplary embodiments, features, and aspects of this application together with the specification and serve to explain the principles of this application.

[0024] Figure 1 This is a schematic diagram of the structure of a double-layer braided bracket with alternating inner and outer layers according to an embodiment of this application;

[0025] Figure 2 This diagram illustrates a cross-sectional structure of a double-layered braided support with an alternating inner and outer layer arrangement, according to an embodiment of this application.

[0026] Figure 3 (a) shows a schematic diagram of wires connected in the same direction. Figure 3 (b) shows a schematic diagram of reverse connection of the wire strands;

[0027] Figure 4 (a) Schematic diagram showing the opposite-direction connection of the wire strands at α = 180 degrees. Figure 4 (b) Schematic diagram showing the opposite-direction connecting strands α = 360 degrees;

[0028] Figure 5 (a) A schematic diagram showing the 180-degree angle between the wire strands connected in the same direction. Figure 4 (b) Schematic diagram showing the unidirectional connection of the wire strands α = 360 degrees;

[0029] Figure 6 This is a schematic diagram of the take-up group structure of a double-layer braided support with alternating inner and outer layers according to an embodiment of this application;

[0030] Figure 7 This is a schematic diagram showing the closed fixing of the take-up group of a double-layer braided bracket with an alternating inner and outer arrangement according to an embodiment of this application;

[0031] Figure 8 This is a schematic diagram of the closed end of the fully take-up and take-up group of a double-layer braided support with an alternating inner and outer arrangement according to an embodiment of this application.

[0032] Figure 9 This diagram shows an axial view of the fully looped closed end of a double-layered braided support with interlocking internal and external structures, according to an embodiment of this application.

[0033] Figure 10 This diagram illustrates the staggered layer distribution at the closed end of a double-layered braided support with staggered inner and outer layers, as shown in an embodiment of this application.

[0034] Figure 11 This is a schematic diagram of a non-interlayer connection structure of a double-layer braided support with interlocking internal and external structures, according to an embodiment of this application.

[0035] Figure 12 This is a partially enlarged schematic diagram showing a double-layer braided bracket with an alternating inner and outer arrangement according to an embodiment of this application;

[0036] Figure 13 Another schematic diagram of a double-layer braided bracket with an alternating inner and outer arrangement according to an embodiment of this application is shown;

[0037] Figure 14 This diagram illustrates the intersection of the inner and outer braided units in an embodiment of this application. Detailed Implementation

[0038] Various exemplary embodiments, features, and aspects of this application will now be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings denote elements that have the same or similar functions. Although various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.

[0039] It should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" 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 present invention or 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 present invention.

[0040] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0041] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments.

[0042] Furthermore, to better illustrate this application, numerous specific details are provided in the following detailed embodiments. Those skilled in the art should understand that this application can be implemented without certain specific details. In some instances, methods, means, components, and circuits well-known to those skilled in the art have not been described in detail in order to highlight the main points of this application.

[0043] See Figure 1 , Figure 2 and Figure 14 The double-layer braided support structure with alternating inner and outer layers in this embodiment includes: a braided body 100, which is a hollow column structure, comprising at least an outer braided layer 110 and an inner braided layer 120. The outer braided layer 110 is woven from multiple strands of outer braided yarns, and the inner braided layer 120 is woven from multiple strands of inner braided yarns. The braiding method is the same as that of the outer braided layer 110, and the inner and outer braided yarns are staggered on different planes. At least one inner braided yarn of the inner braided layer 120 is cross-woven with at least one outer braided yarn of the adjacent outer braided layer 110, and the inner braided yarn is woven along the original braiding path or along the braiding path of the outer braided yarns. This reduces the potential risk of support delamination in the double-layer braided support structure with alternating inner and outer layers. By changing the original pressure wire structure, the ability to resist deformation near the interlayer connection points is increased, which can drive the braided yarns that have been displaced due to friction near the interlayer connection points to quickly return to their original positions, resisting the risk of local delamination of the support structure.

[0044] The inner braided yarn of the inner braided layer 120 and the inner braided yarn of the outer braided layer 110 are not completely aligned, but are staggered, and there is an angular difference between the inner braided yarn and the outer braided yarn to ensure that the inner braided yarn can be cross-woven with the outer braided yarn.

[0045] In this embodiment, the stent of the braided body 100 contains a special braided structure, which, while ensuring high radial support, high metal coverage, low shortening rate, and better blood flow guidance, greatly reduces the potential risk of stent delamination in the double-layer braided stent with its internal and external interlacing. This has certain advantages for clinical use in treating hemorrhagic aneurysms. Specifically, by rotating and interlacing the braided strands at the connecting strands of the stent, the resistance to deformation near the interlayer connection points 301 is increased. After external force is applied, these interlayer connection points 301, due to their high rigidity, can quickly restore the braided strands near the interlayer connection points 301 that have been displaced by friction to their original positions, thus resisting the risk of local stent delamination. The interlayer connection groups distributed throughout the double-layer braided stent with its internal and external interlacing further increase the overall resistance of the stent to delamination.

[0046] In one specific embodiment, see [reference] Figure 2 The main body 100 has a double-layered braided structure, including an outer braided layer 110 and an inner braided layer 120. The inner braided layer 120 has 2m braided threads, with m threads each of the 1-direction braided thread 130 and the 2-direction braided thread 140. The outer braided layer 110 has 2n braided threads, with n threads each of the 1-direction braided thread 130 and the 2-direction braided thread 140. The total number of braided thread ends w = 2(m + n), where m + n ≥ 6, and m and n are both natural numbers greater than 0.

[0047] In this specific embodiment, see Figure 3 and Figure 4 Connecting strands are formed by the interlacing of inner and outer braided yarns. Connecting strands can be unidirectional connecting strands composed of braided yarns with the same direction of rotation, or anisodirectional connecting strands composed of braided yarns with different directions of rotation.

[0048] In one specific embodiment, see [reference] Figure 4 and Figure 5 Two braided threads in the connecting strands are interwoven together in a clockwise or counterclockwise direction to form an interlayer connection point 301, where the rotation angle α = C * 180°, and C is a natural number greater than 0.

[0049] In one specific embodiment, see Figure 14 The inner braid 120 and braid 110 are arranged alternately, through... Figure 14 In the middle, the shades of color are indicated.

[0050] In this specific embodiment, at least one outer braiding filament 111 and one inner braiding filament 121 are included. There are four ways to connect the outer braiding filament 111 and the inner braiding filament 121: opposite-direction connection with α = 180 degrees, opposite-direction connection with α = 360 degrees, same-direction connection with α = 180 degrees, and same-direction connection with α = 360 degrees. Thus, different connection methods between the outer braiding filament 111 and the inner braiding filament 121 can be selected according to the application scenario, ensuring the deformation resistance of the braided body while allowing for proper bending.

[0051] Furthermore, in the braided strands, when the braiding directions of the inner and outer layer braids are the same, the outer layer braids are braided along the braiding direction of the inner layer braids into the braided inner layer 120, and the inner layer braids are braided along the braiding direction of the outer layer braids into the braided outer layer 110, and the number of exchanges is at least once. The angle between the braided strands woven in the braided inner layer 120 and the braided strands woven in the braided outer layer 110 is 20° < α < 180°.

[0052] In the braided strands, the braided strands of the inner layer and the braided strands of the outer layer have different braiding directions. In the braided strands, the braided strands of the outer layer are braided along the braiding direction of the inner layer and are braided into the braided inner layer 120. In the braided strands, the braided strands of the inner layer are braided along the braiding direction of the outer layer and are braided into the braided outer layer 110.

[0053] In one specific embodiment, see [reference] Figure 12 The stent's braiding pitch is P. Within one braiding pitch, all braided filaments rotate 360° circumferentially along the stent. At the same axial position, the braided body 100 has r interlayer connection points 301 circumferentially, forming an interlayer connection group, where 1 ≤ r ≤ min(m, n). Within one pitch P, there are t interlayer connection groups axially along the stent. Depending on the surgery, the spacing between the interlayer connection groups along the stent's axial direction varies, resulting in different effects. Specifically, when the spacing between two adjacent interlayer connection groups is small, the flexibility of this area decreases; when the spacing between two adjacent interlayer connection groups is large, the flexibility of this area increases. Therefore, depending on the location, the number of braided filaments in the outer and inner layers of the stent forming braided strands, as well as the number of interlayer connection points 301 formed by cross-weaving, will differ.

[0054] In this specific embodiment, see Figure 12 The r interlayer connection points 301 in an interlayer connecting wire group can be composed entirely of connecting wire strands in the same direction or connecting wire strands in opposite directions, or can contain both connecting wire strands in the same direction and connecting wire strands in opposite directions at the same time.

[0055] In this specific embodiment, the number of connecting thread groups distributed at different axial positions of the braiding body 100 can be the same or different.

[0056] In one specific embodiment, see [reference] Figure 6 , Figure 7 and Figure 12 At the non-interlayer connection structure 302, the included angles formed by the braids of direction 1 (130) and direction 2 (140) are respectively between 20° and 160°. (See reference...) Figure 6 The braided threads do not overlap and are arranged in an interlaced manner. There are no interlayer connection points 301 between the braided inner layer 120 and the braided outer layer 110. The two-layer braided structure of the braided body 100 can be any regular braided structure such as 1-1, 1-2, 2-2, or a combination thereof.

[0057] In one specific embodiment, the braiding filament of the braided body 100 can be prepared by materials with shape memory properties, such as nickel-titanium and cobalt-chromium, either alone or in combination.

[0058] In this specific embodiment, the braided body 100 can be made entirely of platinum-containing nickel-titanium tubing or platinum-containing cobalt-chromium-nickel tubing in order to achieve a whole-body developing effect.

[0059] In this specific embodiment, the 100-frame braided body can be prepared by a mixed weaving method using nickel-titanium wire or cobalt-chromium wire and platinum wire.

[0060] Among them, see Figure 11 The relationship between the number of ends x of the nickel-titanium wire or cobalt-chromium wire in the main body 100 and the number of ends y of the platinum wire is x = q * y, where q is a positive integer and q ≤ 48.

[0061] In one specific embodiment, the outer diameter of the braided body 100 is 1.5 to 7 mm, and the length is 10 to 70 mm.

[0062] In one specific embodiment, participants Figure 8 , Figure 9 , Figure 10 and Figure 12 The braided body 100 containing interlayer connection points 301 can have its two ends of braided filaments loose, or a partially or fully enclosed structure formed by binding the non-transparent metal hollow tube 400 and the braided filaments together through methods such as rewinding, welding or mechanical pressing.

[0063] In one specific embodiment, based on the above content, when the braided body 100 has a multi-layer structure, that is, when the number of braided layers L > 2, the braided layers of different layers are Li from the inside to the outside, and the number of braided yarns corresponding to different braided layers are Ni, where i is a natural number greater than 0, and the total number of yarns of the support is w = ΣNi.

[0064] In this specific embodiment, the connecting strand at the interlayer connection point 301 can be composed of the innermost and outermost braiding strands of the braiding body 100, or it can be composed of braiding strands from adjacent braiding layers. The connecting strands can be in the same direction or opposite directions. During the weaving process, two braiding strands in the connecting strand interweave together in a clockwise or counterclockwise direction to form an interlayer connection point 301, where the rotation angle α = C * 180°, and C is a natural number greater than 0.

[0065] In this specific embodiment, see Figure 13 The interlayer connection of the multi-layer braided body 100 can be a cross-layer connection, which is formed by the braiding yarn of the innermost layer of the braided body 100 and the braiding yarn of the outermost layer of the braided body 100, forming a cross-layer connection point.

[0066] In this specific embodiment, the interlayer connection of the multi-layer braided body 100 can be a layer-by-layer connection, which is formed by the braiding yarns of adjacent braided layers. L1 and L2 form an interlayer connection point 301D1^2, L2 and L3 form an interlayer connection point 301D2^3, and so on, until the braiding yarns of the outermost layer of the braided body 100 participate in the interlayer connection. D1^2, D2^3, ... Di-1^i together constitute an interlayer connection matrix.

[0067] In this specific embodiment, within a braiding pitch P, all braiding filaments rotate 360° circumferentially along the support. There are r interlayer connection points or interlayer connection matrices or combinations thereof in the circumferential direction of the braiding body 100, forming an interlayer connection group, where 1≤r≤min(Ni / 2). Within a pitch P, there are a total of t interlayer connection groups in the axial direction of the braiding body 100, where 1≤t≤w / 2.

[0068] In one specific embodiment, the braided ends at both ends of the support can be loose, or a partially or fully enclosed structure can be formed by binding the non-transparent metal hollow tube and the braided wire together through methods such as rewinding, welding, or mechanical pressing.

[0069] In this specific embodiment, the choice can be made by varying the method of application and the number of braids. Specifically, when the braided ends of the stent are loose, the stent manufacturing process is time-saving and labor-saving, shortening the production time. When the braided ends of the stent are wound back, since there are no loose ends, they will not damage the inner wall of the blood vessel, avoiding irritation to the blood vessel. Furthermore, a combination of partially loose and partially wound braids can be used. Welding can be used to directly weld the loose ends of the stent. Mechanical clamping is similar to welding, directly clamping and fixing the loose ends of the stent.

[0070] The inner and outer braided layers of the support structure employ an innovative closed-loop yarn-gathering technology at both ends, achieving optimized fully or partially closed structures. The core of this technology lies in the precise allocation of yarn ends. At the beginning and end of the braiding process, all yarn ends (total quantity w) are evenly divided into several groups (denoted as η, with selectable values ​​of 3, 4, 6, 8, 10, 12, etc.), each group containing an equal number of yarn ends, w / η. Subsequently, a specific number of groups (denoted as ε, a natural number greater than 0 and less than or equal to η) are further subdivided, each group being split in two to form two sub-bundles. These sub-bundles can rotate in the same or opposite directions, creating a stable and compact yarn bundle structure through this delicate dynamic balance. These two carefully processed yarn bundles are then bound together in parallel, forming a closed loop yarn-gathering group. This process not only reduces the possibility of yarn end scattering but also enhances the structural strength at both ends of the support structure through physical binding, resulting in a support structure that maintains flexibility while also possessing higher stability and durability.

[0071] The weaving method of binding the ends of the two layers of the main body 100 together by fully closed or partially closed yarn binding includes the following steps:

[0072] S100. When starting or ending weaving, the total number of yarn ends w involved in weaving is first divided into η weaving yarn groups. The number of yarn ends in each weaving yarn group is w / η, where η can be 3, 4, 6, 8, 10, or 12.

[0073] S200, further divide the ε group into two bundles, where ε is a natural number greater than 0 and ε≤η;

[0074] S300, the two equally divided bundles of braided yarns rotate in the same or opposite directions to form a stable yarn bundle, and then the two yarn bundles are bound together in parallel to form a take-up group.

[0075] In one specific embodiment, the take-up group of the braiding body 100 can be fixed by welding. The welding method includes, but is not limited to: 1. welding the top ends of the inner and outer layers of the braiding body 100; 2. welding the attachment positions of the inner and outer layers of the braiding body 100.

[0076] In one specific embodiment, the end of the braided body 100 contains X-ray resistant hollow precious metal tubes 400, the number of which is ε. The hollow precious metal tubes 400 can be connected to the braided yarn by bonding, welding or mechanical pressing.

[0077] In one specific embodiment, the end of the braiding body 100 may adopt a full or partial back-winding structure design, dividing the w braiding filaments into w / 2 groups, with two adjacent braiding filaments having different directions of rotation forming a back-winding group.

[0078] In one specific embodiment, both the take-up group and the rewinding group can be staggered.

[0079] In summary, during the weaving process of the double-layer braided support with alternating inner and outer layers, one braiding filament is selected from each of the two layers of the braided body 100 to form a braided strand. During the weaving process, the two braiding filaments in the braided strand are rotated by an integer multiple of 180° to form interlayer connection points 301. Interlayer connection points 301 located at the same circumferential height of the braided body 100 constitute an interlayer connection group. Several identical or different interlayer connection groups are distributed along the axial direction of the braided body 100. These interlayer connection points 301 are distributed in the non-interlayer connection structure.

[0080] Example 1

[0081] The double-layer braided body 100 mentioned in this invention has a fully closed end-tucked structure. The inner braided layer 120 and the outer braided layer 110 have the same number of yarn ends. Each interlayer connecting group has 6 oppositely connected yarn strands. All braided yarns are nickel-titanium-platinum core braided yarns that can be developed throughout the entire body.

[0082] Example 2

[0083] The two ends of the braided body 100 each include a certain number of conical rings. The end of the ring contains a hollow tube 400 that is non-transparent and can locate the position of the support. It contains two sets of connecting wires, which are arranged at intervals along the axial direction of the support.

[0084] Example 3

[0085] The braided wire at one end of the braided body 100 is a closed structure formed by winding. The non-transparent metal hollow tube 400 is sleeved on the braided wire at the winding point. The other end of the braided body 100 is connected to the non-transparent metal hollow tube 400 by welding or mechanical pressing. The support includes two types of connecting wire groups. The interlayer connection points 301 of the two types of connecting wire groups are staggered along the axial direction of the support.

[0086] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A double-layered braided support with alternating inner and outer layers, characterized in that, Includes: the main body of the weaving; The woven body is a hollow cylindrical structure, comprising at least an outer woven layer and an inner woven layer; The outer woven layer and the inner woven layer are coaxially arranged; The woven outer layer is made of multiple strands of woven outer yarn; The inner braided layer is woven from multiple strands of inner braided yarn, and the braiding method is the same as that of the outer braided layer. The inner and outer braided yarns are interlaced on different planes. At least one inner braided yarn of the inner braided layer is cross-braided with at least one outer braided yarn of the adjacent outer braided layer, and the inner braided yarn is braided along the original braiding path or along the braiding path of the outer braided yarn.

2. The double-layered braided support with alternating inner and outer layers as described in claim 1, characterized in that, The braided yarn is a single or multiple yarns, which are formed into a spring, strand, or rope structure in advance or during the weaving process by twisting, coiling, or other methods.

3. The double-layered braided support with alternating inner and outer layers as described in claim 1, characterized in that, The angle formed by the inner braid and the outer braid along the axial direction of the support is in the range of 20 degrees to 180 degrees.

4. The double-layered braided support with alternating inner and outer layers as described in claim 1, characterized in that, The inner and outer braided yarns are interwoven and rotated clockwise or counterclockwise to form an interlayer connection point.

5. The double-layered braided support with alternating inner and outer layers according to any one of claims 1-4, characterized in that, At the same axial position of the bracket, there is at least one interlayer connection point in the circumferential direction of the bracket.

6. The double-layered braided support with alternating inner and outer layers according to any one of claims 1-4, characterized in that, The interlayer connection points are spaced apart along the axial direction of the support.

7. The double-layered braided support with alternating inner and outer layers as described in claim 1, characterized in that, The diameter of both the inner braided yarn and the outer braided yarn is within the range of 20 micrometers to 100 micrometers.

8. The double-layered braided support with alternating inner and outer layers according to any one of claims 1-4, characterized in that, The braided ends of the connecting strands are either loose, partially closed, or fully closed.

9. The weaving method according to claim 8, characterized in that, The end of the braided body is fitted with a hollow tube of precious metal that is not transparent to X-rays.

10. The weaving method according to claim 9, characterized in that, The ends of the braided body are fully or partially wound back, and the braided yarns with different directions of rotation are wound together. Both the take-up group and the rewinding group can be staggered.

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