support

Abstract

This invention relates to a support structure comprising multiple supporting bodies connected to adjacent supporting bodies via multiple connecting rods. Each supporting body includes multiple main body units connected in a ring structure. Each main body unit includes a top, a first side, and a second side. The connection point between adjacent main body units forms a bottom. The two ends of the connecting rods are respectively connected to the outer sides of the corresponding top and bottom of adjacent supporting bodies. The connecting rods are arranged spirally in space. In this invention, the multiple connecting rods are spirally arranged around the axial direction of the support structure, avoiding uneven expansion that can easily occur when the connecting rods are arranged in a straight line on the support surface. This ensures that even when the support is bent, the distribution of the mesh openings remains relatively uniform, allowing the support to have sufficient compressive strength while maintaining a smaller overall diameter, thus achieving good conveying performance.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to an intraluminal stent. Background Technology

[0002] Endovascular stenting is currently an important method for treating luminal stenosis. For example, after the endovascular stent is delivered to the lesion site using a delivery system, the stent expands to restore blood flow to the narrowed vessel. Since its clinical application, it has developed rapidly, from early bare-metal stents (expandable, self-expanding) to drug-eluting stents and then to biodegradable stents. The goal is to minimize the occurrence of related complications after the stent is transported and placed to provide support.

[0003] However, the various properties of a stent are in balance with each other. Early closed-loop stents, although they had excellent anti-compression properties, had very poor flexibility, making them difficult to deliver to the lesion site and even damaging healthy blood vessels during the delivery process.

[0004] While current open-loop stent designs have significantly improved stent flexibility, they also result in extremely uneven stent mesh distribution after expansion, especially during bending. This affects plaque coverage, drug distribution in drug-eluting stents, and reduces stent compressibility, making it difficult to reduce stent wall thickness and improve overexpansion performance. Furthermore, the excessive axial flexibility of stents makes them prone to axial deformation and strut lift in particularly tortuous and complex vessels, potentially damaging the vessel. This is especially true in cases requiring stent overlap, where the re-crossing stent can easily deform the existing stent. Summary of the Invention

[0005] Based on this, the present invention provides a support that has good transport performance and expansion consistency while ensuring sufficient anti-compression performance.

[0006] On one hand, the present invention provides a support frame, comprising multiple supporting bodies connected sequentially to form a tubular structure. Adjacent supporting bodies are connected by multiple connecting rods. Each supporting body includes multiple main body units connected end-to-end to form a ring structure. Each main body unit includes a top, a first side, and a second side. The first side and the second side are respectively connected to the two ends of the top and are arranged at an included angle. The first side of one of two adjacent main body units is connected to the second side of the other to form a bottom. The top and the bottom are alternately distributed in the main body units along the circumference of the support frame. Multiple connecting rods connecting adjacent supporting bodies are spaced apart along the circumference of the support frame. One end of the connecting rod is connected to the outside of the top of the main body unit in one supporting body, and the other end of the connecting rod is connected to the outside of the bottom of the main body unit in another supporting body. The multiple connecting rods are spirally arranged around the axial direction of the support frame, and the connection points of the connecting rods to the top and the connection points of the connecting rods to the bottom are staggered in the circumference of the support frame.

[0007] In one embodiment, one end of the connecting rod is smoothly engaged with the top along the extension direction of the first side, and the other end of the connecting rod is smoothly engaged with the bottom along the extension direction of the first side;

[0008] Alternatively, one end of the connecting rod may be smoothly joined to the top along the extension direction of the second side, and the other end of the connecting rod may be smoothly joined to the bottom along the extension direction of the second side.

[0009] In one embodiment, the tops of all the main units within the same support body are aligned on a circumference extending circumferentially along the support, and the bottoms of all the main units within the same support body are aligned on another circumference extending circumferentially along the support.

[0010] In one embodiment, each support body is connected to an adjacent support body via a first connecting rod, a second connecting rod, and a third connecting rod, wherein the distance between the first connecting rod and the second connecting rod is not equal to the distance between the second connecting rod and the third connecting rod.

[0011] In one embodiment, the distance between the first connecting rod and the third connecting rod is equal to the distance between the second connecting rod and the third connecting rod.

[0012] In one embodiment, the distance between the first connecting rod and the second connecting rod is less than the distance between the second connecting rod and the third connecting rod.

[0013] In one embodiment, the first connecting rod and the second connecting rod include two main body units, and the second connecting rod and the third connecting rod include three main body units.

[0014] In one embodiment, a plurality of the support bodies are arranged at equal intervals along the axial direction of the bracket, or adjacent support bodies are mirror-symmetrical to each other.

[0015] In one embodiment, two adjacent support bodies are offset around the support frame.

[0016] In one embodiment, every two adjacent support bodies are deflected at the same angle in the circumferential direction of the support.

[0017] On the other hand, the present invention also provides a support frame, comprising multiple support bodies connected sequentially to form a tubular structure. Adjacent support bodies are connected by multiple connecting rods. Each support body includes multiple main body units connected end-to-end to form a ring structure. Each support body is connected to adjacent support bodies via a first connecting rod, a second connecting rod, and a third connecting rod. The distance between the first connecting rod and the second connecting rod is not equal to the distance between the second connecting rod and the third connecting rod.

[0018] The stent provided by this invention improves the uneven expansion of the stent by using a non-linear arrangement of connecting rods on the stent surface. This ensures that the distribution of the stent mesh remains relatively uniform even when the stent is bent, so that the stent has sufficient compression resistance and can also effectively cover the lesions on the blood vessel wall that need support. Furthermore, during the stent compression and contraction process, the connecting rods are always connected to the outer side of the top and the outer side of the bottom, so that the stent as a whole can have a smaller diameter, thereby achieving good delivery performance. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the planar unfolded structure of the bracket in Example 1;

[0020] Figure 2 for Figure 1 A partial schematic diagram of the unfolded planar structure of the support is shown;

[0021] Figure 3 This is a partial schematic diagram of the planar unfolded structure of another embodiment of the support in Example 1;

[0022] Figure 4 This is a schematic diagram of the bracket in the bent state of Example 1;

[0023] Figure 5 This is a schematic diagram of the support structure in Example 2;

[0024] Figure 6 for Figure 5 The diagram shows the planar unfolded structure of the support.

[0025] Figure 7 for Figure 6 A partial schematic diagram of the unfolded planar structure of the support is shown;

[0026] Figure 8 This is a schematic diagram of the support structure in Example 3;

[0027] Figure 9 for Figure 8 The diagram shows the planar unfolded structure of the support.

[0028] Figure 10 This is a schematic diagram of the support structure in Example 4;

[0029] Figure 11 for Figure 10 The diagram shows the planar unfolded structure of the support.

[0030] Figure 12 for Figure 11 A partial schematic diagram of the planar unfolded structure of the support is shown. Detailed Implementation

[0031] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0032] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element; the "connection" also includes detachable connections. In this invention, the so-called axial direction refers to the length direction of the support. Figure 5 Taking the illustrated bracket as an example, the length direction of the bracket, i.e., the left-right direction, defines the axial direction of the bracket. Correspondingly, the circumferential direction refers to the direction of circumference around this axial direction. The terms "inner," "outer," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0033] Combination Figure 1 and Figure 4As shown, a stent can be used to treat luminal stenosis. A delivery system is used to deliver the stent to the location of the narrowing or blockage, and the stent expands to restore the original function of the narrowed or blocked area. Lumens include, but are not limited to, coronary arteries, peripheral arteries, cerebral arteries, limb veins, esophagus, airway, intestines, biliary tract, cervix, urinary tract, prostate, joint cavities, and intervertebral spaces. For ease of description, this article uses blood vessels to illustrate examples of the use of all luminals.

[0034] Based on their expansion method, stents are divided into two main categories: balloon-expandable stents and self-expanding stents. Taking stent implantation in a blood vessel as an example, balloon-expandable stents are inelastic in themselves. When released into the blood vessel, they are expanded to a certain diameter by the inflation of a balloon. Due to their plasticity, there is no residual elasticity after expansion, which remains in the blood vessel to withstand the rebound pressure of the vessel wall and maintain blood flow. Self-expanding stents, on the other hand, are usually made of materials such as stainless steel wire or nickel-titanium alloy (shape memory alloy) wire to form a mesh-like structure. The stent itself is elastic and expands on its own after release into the blood vessel to support the vessel wall and maintain blood flow. In the embodiments of this application, the expansion method of the stent is not limited. That is to say, the stent structure in the embodiments of this application can be applied to both expandable stents and self-expanding stents.

[0035] The stent can be a bare metal stent or a drug-eluting stent. In other embodiments, the stent can also be of other types, such as a biodegradable stent, to provide good support when delivered to a narrow or blocked location. Once the narrow or blocked location regains its original function, the biodegradable stent can be degraded and absorbed without needing to be removed and causing adverse effects.

[0036] In other embodiments, the stent may have grooves or through-holes in the support body 2 and / or connecting rod 3 for drug loading, i.e., a drug-loaded stent. The drug loaded thereon can be absorbed as the stent is implanted into the blood vessel. In some embodiments, the drug carried by the stent includes one or more of the following substances: anti-inflammatory drugs, antiplatelet drugs, anticoagulants, anticancer drugs, immunosuppressants and / or hormones, endometrial cell proliferation inhibitors, preferably rapamycin and its derivatives, paclitaxel and its derivatives, probucol and its derivatives, dexamethasone and its derivatives, asiaticoside, heparin, aspirin, cilostazol, ticlopidine, tripterygium wilfordii, cyclosporine, tacrolimus, or estradiol, more preferably rapamycin.

[0037] Example 1

[0038] Continue reading Figure 1 and Figure 4As shown, the support structure includes multiple support bodies 2, which are connected sequentially to form a tubular structure. Adjacent support bodies 2 are connected by multiple connecting rods 3. Each support body 2 includes multiple main body units 1 connected end to end to form a ring structure.

[0039] Combination Figure 2 As shown, the main body unit 1 of the unfolded support has a structure similar to a "V" or "U" shape. Specifically, the main body unit 1 includes a top 11, a first side 12, and a second side 13. The first side 12 and the second side 13 are respectively connected to the two ends of the top 11, and the first side 12 and the second side 13 are set at an included angle. It should be noted that in the expanded state of the support, the included angle between the first side 12 and the second side 13 can range from 25° to 170°, so that the angle between the first side 12 and the second side 13 can better adapt to the expansion needs of the main body unit 1. When the support expands or contracts radially, the first side 12 and the second side 13 open or fold towards each other with the top 11 as the base point.

[0040] The angle between the first side portion 12 and the second side portion 13 ranges from 25° to 60°, such as 25°, 30°, 35°, 40°, 45°, 50°, or 60°. With this structural arrangement, in the "V" or "U" shaped structure formed by the main body unit 1, the first side portion 12 and the second side portion 13 will form an acute angle with a small opening around the top 11 as the vertex, thereby enhancing the radial support of the support and obtaining stronger support performance to improve support stability.

[0041] The included angle between the first side portion 12 and the second side portion 13 ranges from 110° to 150°, such as 110°, 120°, 130°, 140°, or 150°. Alternatively, a larger acute angle can be used to accommodate the large-scale expansion and contraction of the lumen in the radial direction, thereby increasing the adjustment range of the support for the lumen wall.

[0042] Combination Figure 1 and Figure 2 As shown, the first side 12 of one of two adjacent main body units 1 is connected to the second side 13 of the other to form a bottom 10. The top 11 and bottom 10 are alternately distributed along the circumference of the support in the main body unit 1. A plurality of connecting rods 3 connecting two adjacent supporting bodies 2 are distributed at intervals along the circumference of the support, and one end 3a of the connecting rod 3 is connected to the outside of the top 11 of the main body unit 1 in one of the supporting bodies 2, and the other end 3b of the connecting rod 3 is connected to the outside of the bottom 10 of the main body unit 1 in the other supporting body 2.

[0043] It should be noted that "outer side of top 11" refers to the side of top 11 facing away from the main body unit 1 where it is located; similarly, "outer side of bottom 10" refers to the side of bottom 10 facing away from the main body unit 1 where it is located. That is, as... Figure 3 As shown, the connection point between two adjacent main body units 1 is the bottom 10. Arrow O1 points to the outside of the top 11, and arrow O2 points to the outside of the bottom 10. Thus, during the compression and contraction of the support, since the connecting rod 3 is always connected to the outside of the top 11 and the outside of the bottom 10, the connecting rod 3 between two adjacent support bodies 2 will not extend into the support body 2. Consequently, during the compression and contraction of the support, the connecting rod 3 will not interfere with the main body unit 1 constituting the support body 2. This allows the support to maintain compliant expansion and contraction, and the overall diameter of the support after compression and contraction can be smaller, resulting in good transport performance and facilitating the transport of the support into the cavity requiring expansion. Because of this structural design, the connecting rod 3 does not interfere with the main body unit 1 of the support body 2, thereby improving the overall bending performance of the support.

[0044] Multiple connecting rods 3 are spirally arranged around the axial direction of the stent to improve the uneven expansion of the stent, so that even when the stent is bent, the distribution of the stent mesh remains relatively uniform, so that the stent can better cover the lesions on the lumen wall that need support.

[0045] Specifically, in combination Figure 4 As shown, because multiple connecting rods 3 are spirally arranged around the axial direction of the support, the connecting rods 3 are relatively evenly distributed in the circumferential and axial directions when the support bends. The outermost main unit 1, located in the bending state of the support, does not appear uneven due to the traction of the spirally arranged connecting rods 3. The overall bending of the support is more smooth, which is conducive to the delivery of the support into the cavity. The spiral arrangement of the connecting rods 3 gives the support a certain rigidity in the axial direction, avoiding the support from being too soft and easily deformed in the axial direction, which would cause the main unit 1 to warp.

[0046] Furthermore, combined Figure 2 and Figure 3As shown, the connections between the connecting rod 3 and the top 11, and between the connecting rod 3 and the bottom 10, are staggered in the circumferential direction of the support. That is, with the plane containing the cross-section of the support as the reference plane, the orthographic projection of the connection between the connecting rod 3 and the top 11 on the reference plane is spaced apart from the orthographic projection of the connection between the connecting rod 3 and the bottom 10 on the reference plane. Since the two ends of the connecting rod 3 are connected to the top 11 and the bottom 10 of two adjacent support bodies 2 respectively, this structural arrangement gives the connecting rod 3 a helical connection between the adjacent support bodies 2, enhancing the axial stiffness of the support. Furthermore, because the connections between the two adjacent support bodies 2 and the connecting rod 3 are staggered in the circumferential direction of the support, the force on the connecting rod 3 can be released by the slight circumferential twist between the two adjacent support bodies 2, preventing excessive stress on the connecting rod 3 and causing cracks at the connections with the top 11 and the bottom 10, thus providing more stable bending performance.

[0047] In some embodiments, one end 3a of the connecting rod 3 is smoothly joined to the top 11 along the extending direction of the first side 12, and the other end 3b of the connecting rod 3 is smoothly joined to the bottom 10 along the extending direction of the first side 12.

[0048] It should be noted that "along the extension direction of the first side 12" includes not only directions that are completely parallel to or coincide with the extension direction of the first side 12, but also any direction within a certain angle range, such as any direction offset from the extension direction of the first side 12 by -5° to 5°. One end 3a of the connecting rod 3 is smoothly joined to the top 11 in such a way that the connecting rod 3 generally follows the extension direction of the first side 12 into the top 11 of the corresponding main body unit 1; correspondingly, the other end 3b of the connecting rod 3 generally follows the extension direction of the first side 12 into the bottom 10 of the corresponding main body unit 1.

[0049] In this way, when the support is compressed and contracted, the connection between the connecting rod 3 and the top 11, as well as the connection between the first side 12 and the top 11, ensures that the structure of the first side 12, the part of the top 11 (the part connected to the connecting rod 3), and the part of the connecting rod 3 near the top 11 form a basically linear and smooth transition. This results in a more uniform stress distribution and avoids excessive local stress at the connection points, which could easily lead to cracking. Understandably, the other end 32 of the connecting rod 3, roughly following the extension direction of the first side 12, merges into the bottom 10 of the corresponding main body unit 1. This also effectively enhances the stress balance of the support, reducing the likelihood of excessive local stress at the connection point between the connecting rod 3 and the bottom 10, which could easily lead to cracking.

[0050] It should be noted that all connecting rods 3 in the bracket are connected to the corresponding top 11 and bottom 10 in accordance with the above-described connection method, and the arrangement of each connecting rod 3 on the bracket is consistent, that is, as shown above. Figure 2As shown, each connecting rod 3 is integrated into the bracket in a manner consistent with the top 11 and bottom 10 of the adjacent supporting body 2.

[0051] In other embodiments, one end 3a of the connecting rod 3 smoothly joins the top 11 along the extending direction of the second side 13, and the other end 3b of the connecting rod 3 smoothly joins the bottom 10 along the extending direction of the second side 13. In this structural form, the two ends of the connecting rod 3 respectively merge into the corresponding top 11 and bottom 10 along the extending direction of the second side 13, thereby also achieving the above-mentioned effect, that is, effectively enhancing the stress balance of the support, so as to reduce the excessive local stress generated at the connection between the connecting rod 3 and the support body 2, which is prone to cracking.

[0052] "The direction of extension of the second side 13" includes not only directions that are completely parallel to or coincide with the direction of extension of the second side 13, but also any direction within a certain angle range, such as any direction that is offset from the direction of extension of the second side 13 by -5° to 5°.

[0053] The connection between the connecting rod 3 and the top 11 and bottom 10 is smoothly joined in the manner described above, which will not be elaborated here.

[0054] See Figure 1 As shown, the tops 11 of all main body units 1 within the same support body 2 are aligned on a circumference C1 extending circumferentially along the support, and all bottoms 10 within the same support body 2 are aligned on another circumference C2 extending circumferentially along the support. Circumferences C1 and C2 are outer peripheries extending circumferentially along the support and located at different positions along the support axis. When the support is in its natural state, that is, when there is no external force pressing or expanding the support, circumferences C1 and C2 are coaxially arranged in space. For multiple support bodies 2 arranged axially along the support to form a tubular structure, the diameters of circumferences C1 and C2 can be equal or unequal.

[0055] Preferably, the diameter of the cross-sectional circle of the tubular structure presented by the support is equal at any point in the axial direction. That is, the support appears as a cylinder. At this time, the diameter of the annular structure presented by the multiple supporting bodies 2 constituting the support is equal. Correspondingly, the top 11 and the bottom 10 are alternately distributed in the main body unit 1 along the circumference of the support. The diameter of the common circumference C1 of all the tops 11 in the same supporting body 2 is equal to the diameter of the common circumference C2 of all the bottoms 10 in the same supporting body 2.

[0056] Both the top 11 and the bottom 10 are arc-shaped structures. With this structure, when the support is compressed and contracted, the first side 12 and the second side 13 inside the support body 2 open or close relative to each other, and the arc-shaped top 11 and bottom 10 can adapt well to bending without easily cracking.

[0057] Combination Figure 2 and Figure 3 As shown, two adjacent main units 1 are connected to form a sinusoidal wave-shaped rod. The connecting rod 3 is "S"-shaped to facilitate the smooth connection of the connecting rod 3 with the "crest-trough" of the sinusoidal wave-shaped rod. It should be noted that when two adjacent main units 1 are connected to form a sinusoidal wave-shaped rod, the top 11 of the main unit 1 forms the crest of the sinusoidal wave-shaped rod, and the bottom 10 of the main unit 1 forms the peak of the sinusoidal wave-shaped rod.

[0058] In some implementations, the overall structure of the connecting rod 3 can be Z-shaped or straight.

[0059] Multiple support bodies 2 are arranged at equal intervals along the axial direction of the support frame, so that the expansion of the support frame at various points corresponding to the support bodies 2 in the axial direction is more uniform.

[0060] Multiple support bodies 2 can be arranged in a way that translates along the axial direction and connected to each other as one unit by connecting rods 3.

[0061] The supporting body 2 has 3-15 main body units 1 in the circumferential direction, and each pair of adjacent main body units 1 are connected by 2-10 connecting rods 3 in the circumferential direction.

[0062] The connecting rods 3 between each pair of adjacent main units 1 are arranged at equal intervals, thereby improving the overall expansion uniformity of the support by the spiral arrangement of the connecting rods 3, and avoiding the generation of local stress that can easily lead to cracking.

[0063] Example 2

[0064] Combination Figure 5 and Figure 6 As shown, the spiral arrangement of the support body 2 and connecting rod 3 of the bracket in this embodiment is the same as that in Embodiment 1, but the distribution of the connecting rod 3 is different. The connecting rods 3 of the support body 2 in the same circumferential direction are not evenly distributed in the circumferential direction, thereby dividing the area between two adjacent support bodies 2 into areas of different sizes. For example, as Figure 5As shown, three connecting rods 3 are provided between two adjacent support bodies 2. For ease of description, the three connecting rods are shown as the first connecting rod 31, the second connecting rod 32, and the third connecting rod 33, respectively. These three connecting rods 31, 32, and 33 are distributed at unequal intervals in the circumferential direction, separating regions A and B of different sizes. Taking an example where each support body 2 contains 8 main body units 1, every two adjacent support bodies 2 are connected by these three unequally spaced connecting rods 31, 32, and 33. This choice of number allows the support to cover lumens with smaller diameters. Specifically, the first connecting rod 31, 32, and 33 are distributed at unequal intervals in the circumferential direction between two adjacent support bodies 2, separating one region A and two regions B. Since the first connecting rod 31, the second connecting rod 32 and the third connecting rod 33 are not equidistant in the circumferential direction, the sizes of the regions A and B they separate are different. Taking region A as an example, two main units 1 are distributed between the two connecting rods 3, while in region B, three main units 1 are distributed between the two connecting rods 3.

[0065] Furthermore, since the connecting rods 3 of the supporting body 2 in the same circumferential direction are not evenly distributed in the circumferential direction, the connecting rods 3 of every two adjacent supporting bodies 2 in the bracket are arranged in a non-linear manner. That is, the connecting rods 3 are not arranged along the axial direction parallel to the bracket, thereby avoiding the phenomenon of uneven expansion that is easy to occur when the connecting rods 3 on the surface of the bracket are arranged in a straight line.

[0066] Continue reading Figure 5 and 6 As shown, in this embodiment, multiple support bodies 2 are sequentially connected to form a tubular structure. Adjacent support bodies 2 are connected by a first connecting rod 31, a second connecting rod 32, and a third connecting rod 33. The distance from the first connecting rod 31 to the second connecting rod 32 is not equal to the distance from the second connecting rod 32 to the third connecting rod 33. In some embodiments, the distance from the third connecting rod 33 to the first connecting rod 31 is equal to the distance from the second connecting rod 32 to the third connecting rod 33. In other embodiments, the distance from the first connecting rod 31 to the second connecting rod 32 is less than the distance from the second connecting rod 32 to the third connecting rod 33. Taking a blood vessel as an example, the inventors discovered that the shape of plaques in the blood vessel wall is not uniform. If the plaque diameter is smaller than the stent mesh, it can lead to stent failure. The unequal spacing design can avoid this situation. Through the unequal spacing and the spiral distribution of the connecting rods 3, the mesh is made to have density while maintaining a random and uniform distribution throughout the blood vessel lumen, resulting in better coverage of vascular plaques. At the same time, the structure has excellent flexibility and can easily achieve complete torsional deformation during bending without affecting the mechanical properties of the support.

[0067] Combination Figure 7As shown, both the first side portion 12 and the second side portion 13 are straight rods. Since the first side portion 12 and the second side portion 13 are set at an angle, in this embodiment, the two straight rods set at an angle are connected at both ends of the top 11 to form the main body unit 1.

[0068] Example 3:

[0069] Combination Figure 8 and Figure 9 As shown, the support body 2 of the bracket in this embodiment has the same structure as that in embodiment 2, but differs in the arrangement of the support bodies 2 and the structural form of the connecting rods 4. In this embodiment, the support bodies 2 are arranged axially, and adjacent support bodies 2 are distributed in a mirror-symmetrical manner.

[0070] The connecting rod 4 is Z-shaped. The bracket formed by the connecting rod 4 and the supporting body 2 has less radial springback and axial expansion compared to Embodiment 1.

[0071] Example 4:

[0072] like Figures 10 to 12 As shown, the support body 2 of this embodiment has the same structure as that of embodiment 2, but the arrangement of the support body 2 and the structure of the connecting rod 5 are different. Specifically, in this embodiment, the support bodies 2 are arranged along the axial direction of the support, and adjacent support bodies 2 are offset in the circumferential direction of the support. For example, the offset distance d between adjacent support bodies 2 is greater than half the circumferential length D of one main body unit 1 and less than the circumferential length D of one main body unit 1. In this way, the opposing main body units 1 of adjacent support bodies 2 can be as close as possible at the connection with the connecting rod 5, while maintaining a certain offset state. This allows the connecting rod 5 between the main body units 1 in this state to obtain a better circumferential torsion effect when arranged in a spiral shape. This ensures that even when the support is bent, the distribution of the mesh is still relatively uniform, so that the support can have a smaller overall diameter while having sufficient anti-compression performance.

[0073] In this embodiment, the connecting rod 5 can be straight, with its two ends connected to the corresponding top 11 and bottom 10 of the adjacent support body 2, respectively.

[0074] Furthermore, in this embodiment, each pair of adjacent support bodies 2 deflects at the same angle in the circumferential direction of the support. That is, along the axial direction of the support, each pair of adjacent support bodies 2 has the same degree of deflection in the axial direction, so that when the support is compressed and contracted, the force at each place is more uniform, thereby avoiding cracking due to uneven local force.

[0075] It should be noted that, in some embodiments, in combination with Figure 1-10As shown, when processing the above-mentioned bracket, the following parameters can be used: the wall thickness of the supporting body 2 and the connecting rod 5, that is, the wall thickness of the tubular structure presented by the bracket, is between 50μm and 70μm; the width of the supporting body 2 and the connecting rod 5 relative to their own extension direction is between 60μm and 90μm; the semi-finished bracket is processed by laser cutting machine using cobalt-chromium alloy material or biodegradable metal tubing; and then pickling, heat treatment, and electrochemical polishing are performed to obtain the finished bracket.

[0076] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0077] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A support, characterized in that, The system includes multiple supporting bodies, which are sequentially connected to form a tubular structure. Adjacent supporting bodies are connected by multiple connecting rods. Each supporting body includes multiple main body units connected end to end to form a ring structure. Each main body unit includes a top, a first side, and a second side. The first side and the second side are respectively connected to the two ends of the top and are set at an included angle. The first side of one of two adjacent main body units is connected to the second side of the other to form a bottom. The top and the bottom are alternately distributed in the main body units along the circumference of the support. Multiple connecting rods, which connect two adjacent support bodies, are distributed circumferentially around the bracket. One end of each connecting rod is connected to the outer side of the top of the main unit within one support body, and the other end is connected to the outer side of the bottom of the main unit within the other support body. The multiple connecting rods are spirally arranged around the axial direction of the bracket, and the connections between the connecting rods and the top and the connecting rods and the bottom are staggered circumferentially around the bracket. When the bracket expands or contracts radially, the first side and the second side open or fold towards each other with the top as the base point. In the expanded state of the bracket, the angle between the first side and the second side ranges from 25° to 60° or from 110° to 150°. In this configuration, any two adjacent main body units are connected to form a sinusoidal rod, and any two adjacent supporting bodies are deflected in the circumferential direction of the bracket, with each pair of adjacent supporting bodies deflecting at the same angle in the circumferential direction of the bracket. Each connecting rod is inserted into the bracket in the same way as the top and bottom of the adjacent supporting body, and the two ends of each connecting rod are offset by the same distance in the circumferential direction of the bracket. One end of the connecting rod is smoothly joined to the top along the extension direction of the first side, and the other end of the connecting rod is smoothly joined to the bottom along the extension direction of the first side, or one end of the connecting rod is smoothly joined to the top along the extension direction of the second side, and the other end of the connecting rod is smoothly joined to the bottom along the extension direction of the second side.

2. The bracket according to claim 1, characterized in that, The connecting rod is in the shape of an "S", "Z" or a straight line.

3. The bracket according to claim 1, characterized in that, The tops of all main units within the same support body are aligned on a circumference extending along the circumference of the support, and the bottoms of all units within the same support body are aligned on another circumference extending along the circumference of the support.

4. The bracket according to claim 1, characterized in that, Each support body is connected to its adjacent support body via a first connecting rod, a second connecting rod, and a third connecting rod. The distance between the first connecting rod and the second connecting rod is not equal to the distance between the second connecting rod and the third connecting rod.

5. The bracket according to claim 4, characterized in that, The distance between the first connecting rod and the third connecting rod is equal to the distance between the second connecting rod and the third connecting rod.

6. The bracket according to claim 4, characterized in that, The distance between the first connecting rod and the second connecting rod is less than the distance between the second connecting rod and the third connecting rod.

7. The bracket according to claim 4, characterized in that, The first connecting rod and the second connecting rod include two main body units, and the second connecting rod and the third connecting rod include three main body units.

8. The stent according to any one of claims 1-6, characterized in that, Multiple supporting bodies are arranged at equal intervals along the axial direction of the bracket.

9. The stent according to any one of claims 1-6, characterized in that, The two adjacent supporting structures are mirror-symmetrical to each other.

10. The stent according to claim 1, characterized in that, The offset distance between any two adjacent supporting bodies is d, where D / 2 < d < D, and D is the circumferential length of the supporting body unit.

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