A stent

Abstract

The application discloses a stent, which comprises a proximal end part, a first main part, an intermediate part, a second main part and a distal end part; the proximal end part, the first main part, the intermediate part, the second main part and the distal end part are all composed of annular wave-shaped support rods; the first main part and the second main part are both composed of first annular wave-shaped support rods and second annular wave-shaped support rods arranged alternately; the first annular wave-shaped support rods and the second annular wave-shaped support rods are both Z-shaped waves; the length of the Z-shaped wave of the first annular wave-shaped support rod in the axial direction is greater than the length of the Z-shaped wave of the second annular wave-shaped support rod in the axial direction; and the intermediate part is provided with a developing mark. The stent has high radial support force, can greatly enhance the compliance and expansion performance of the stent, improve the bending performance of the stent, has a simple structure and is easy to implement, and is beneficial to determining the specific position of the intermediate part of the stent after the stent is completely released.

Description

Technical Field

[0001] This invention relates to the field of neurointervention, and more particularly to a stent. Background Technology

[0002] Treatment for cerebral hemorrhage typically involves using a dense-mesh stent to re-establish blood flow guidance or stent-assisted coil embolization. The usual surgical strategy involves first establishing a pathway, then delivering the stent or coils to the lesion site, withdrawing the stent or coils, and finally sealing the aneurysm. Stent-assisted coil embolization is a common treatment method. This approach places high demands on the stent; it must be sufficiently flexible and have good wall apposition properties, and it also needs to be visible on X-rays to allow the surgeon to assess the stent's apposition status. Summary of the Invention

[0003] This invention provides a support, comprising a proximal portion, a first main body portion, a middle portion, a second main body portion, and a distal portion connected sequentially from proximal to distal; wherein the proximal portion, the first main body portion, the middle portion, the second main body portion, and the distal portion are all composed of annular wave-shaped support rods; the first main body portion and the second main body portion are each composed of alternately arranged first and second annular wave-shaped support rods, both of which are Z-shaped waveforms, each including multiple V-shaped structures; the axial length of the Z-shaped waveform of the first annular wave-shaped support rod is greater than the axial length of the Z-shaped waveform of the second annular wave-shaped support rod; and a imaging mark is provided on the middle portion. Using this bracket, the Z-shaped waveform of the first annular wave support rod has a longer axial length than the Z-shaped waveform of the second annular wave support rod, which gives the bracket a higher radial support force, greatly enhances the bracket's flexibility and expansion performance, and improves the bracket's bending performance. At the same time, the structure is simple and easy to implement; and a development mark is set on the middle part, which is helpful to determine the specific position of the middle part of the bracket after it is fully released.

[0004] In one embodiment, the intermediate portion includes two first annular wave-shaped support rods, and part of the V-shaped structure in the intermediate portion is replaced by a Y-shaped structure. The Y-shaped structure has a rod-shaped fixing part parallel to the axial direction of the support, and a developing mark is provided on the fixing part. In this embodiment, the rod-shaped fixing part of the Y-shaped structure provides a fixed position for the developing mark, which is beneficial for the installation and fixation of the developing mark.

[0005] In one embodiment, the connection point of the middle portion is formed at the junction of the top end of the V-shaped structure of the first annular wave-shaped support rod adjacent to the first main body portion and the top end of the V-shaped structure of the first annular wave-shaped support rod adjacent to the second main body portion. This embodiment ensures that the middle portion provides sufficient support without being excessive, while also maintaining the flexibility of the support structure.

[0006] In one embodiment, a plurality of Y-shaped structures of the first annular wave-shaped support rod adjacent to the first main body portion in the middle portion are evenly distributed circumferentially, and the free ends of the fixed portions of the Y-shaped structures point towards the second main body portion. The free ends of the fixed portions of the first annular wave-shaped support rod adjacent to the first main body portion in the middle portion are axially spaced from the free ends of the fixed portions of the first annular wave-shaped support rod adjacent to the second main body portion. This embodiment facilitates the even distribution of the developing marks 9 in the middle portion 14 of the support, and allows for clear identification of the open state of the middle portion of the support after complete release. Furthermore, when the support is in a compressed state, it reduces the radial volume of the support and decreases pushing resistance.

[0007] In one embodiment, each of the Y-shaped structures of the first annular wave-shaped support rod adjacent to the first main body portion in the middle portion is staggered circumferentially with each of the Y-shaped structures of the first annular wave-shaped support rod adjacent to the second main body portion in the middle portion; the included angle between the centers of two adjacent Y-shaped structures is a fixed value. This embodiment helps to reduce the radial volume of the support when it is in a compressed state, thus reducing pushing resistance; and after the support is opened, the developing marks facilitate the operator in locating the position of the middle portion of the support.

[0008] In one embodiment, each of the Y-shaped structures of the first annular wave-shaped support rod adjacent to the first main body portion in the middle portion is collinearly arranged with each of the Y-shaped structures of the first annular wave-shaped support rod adjacent to the second main body portion in the middle portion. This facilitates more convenient fixation of the developing marks and makes the developing marks easier to observe and position.

[0009] In one embodiment, both the first annular wave-shaped support rod adjacent to the first main body portion and the first annular wave-shaped support rod adjacent to the second main body portion in the middle portion include two Y-shaped structures. With this embodiment, due to the presence of a sufficient number of development marks, it is advantageous for the development marks to clearly indicate the open state of the middle portion of the support after the support is fully released.

[0010] In one embodiment, the circumferential density of the Z-shaped waveform of the first annular waveform support rod is less than that of the second annular waveform support rod. This embodiment, with its lower circumferential density of the Z-shaped waveform in the second annular waveform support rod, is beneficial for improving the expansion performance of the support structure.

[0011] In one embodiment, a connection point is formed between the first annular wave support rod and the second annular wave support rod. This connection point is located where the trough of the Z-shaped waveform of the first annular wave support rod meets the crest of the Z-shaped waveform of the second annular wave support rod, and where the crest of the Z-shaped waveform of the first annular wave support rod meets the trough of the Z-shaped waveform of the second annular wave support rod. With this embodiment, the support has sufficient support force without being excessive, while also ensuring the flexibility of the support.

[0012] In one embodiment, the proximal portion includes two first annular wave support rods arranged axially side-by-side, or the proximal portion includes two second annular wave support rods arranged axially side-by-side; and / or the distal portion includes two first annular wave support rods arranged axially side-by-side, or the distal portion includes two second annular wave support rods arranged axially side-by-side. This embodiment facilitates the formation of a closed-loop design for both the proximal and distal portions, effectively preventing the free end from puncturing the blood vessel wall.

[0013] In one embodiment, the proximal portion includes two axially parallel first annular wave-shaped support rods, and the first main body portion is connected to the proximal portion via second annular wave-shaped support rods; the proximal portion also includes two axially parallel second annular wave-shaped support rods, and the first main body portion is connected to the proximal portion via first annular wave-shaped support rods; the distal portion includes two axially parallel first annular wave-shaped support rods, and the second main body portion is connected to the distal portion via second annular wave-shaped support rods; the distal portion also includes two axially parallel second annular wave-shaped support rods, and the second main body portion is connected to the distal portion via first annular wave-shaped support rods. This embodiment, due to the fewer connection points between the proximal portion and the first main body portion, and the fewer connection points between the distal portion and the second main body portion, facilitates the formation of a tapered opening.

[0014] In one embodiment, the connection between the proximal portion and the first main body portion forms a tapered opening after the stent is deployed, with the generatrix of the tapered opening forming an angle of 30 to 60 degrees with the axis; similarly, the connection between the distal portion and the second main body portion forms a tapered opening after the stent is deployed, with the generatrix of the tapered opening forming an angle of 30 to 60 degrees with the axis. This embodiment, by providing an outwardly flared tapered opening, enhances the radial support force at both ends of the stent, effectively addressing the displacement problem caused by blood flow impact within the blood vessel.

[0015] In one embodiment, a fixing rod is arranged on the first or second annular wave support rod at the proximal portion away from the first main body portion or the distal portion away from the second main body portion; at the distal portion, the fixing rod extends from the crest of the Z-shaped waveform of the first or second annular wave support rod; at the proximal portion, the fixing rod extends from the trough of the Z-shaped waveform of the first or second annular wave support rod; a plurality of fixing rods are evenly distributed circumferentially; and development marks are provided on the fixing rods. With this embodiment, the distal and proximal portions of the support can be effectively located using the development marks.

[0016] In one embodiment, both the proximal and distal portions include four of the aforementioned retaining rods. This embodiment, due to the sufficient number of radiopaque markers, facilitates clear identification of the open state of the proximal and distal portions of the stent after full deployment.

[0017] In one embodiment, the developing mark is a radiopaque spring or a developing metal ring, and the developing mark is fixed to the bracket by laser welding or adhesive bonding. This embodiment securely fixes the developing mark to the bracket, thus improving the bracket's safety performance.

[0018] In one embodiment, the bracket is formed by laser cutting an alloy tube. This embodiment facilitates the manufacture of the bracket.

[0019] The stent provided in this application has the following advantages compared to the prior art.

[0020] 1. Using this bracket, the Z-shaped waveform of the first annular wave support rod has a longer axial length than the Z-shaped waveform of the second annular wave support rod, and a development mark is provided in the middle part, which makes the bracket have a higher radial support force, and can greatly enhance the flexibility and expansion performance of the bracket, and improve the bending performance of the bracket. At the same time, the structure is simple, easy to implement, and facilitates the determination of the specific position of the middle part of the bracket after the bracket is fully released.

[0021] 2. The setting of the fixing part and the fixing rod is conducive to the fixation of the developing mark.

[0022] 3. The free end of the fixed part of the first annular wave support rod adjacent to the first main body in the middle part is axially spaced from the free end of the fixed part of the first annular wave support rod adjacent to the second main body in the middle part. This facilitates the uniform distribution of the developing marks in the middle of the support and makes it easier for the developing marks to clearly indicate the open state of the middle of the support after the support is fully released. In addition, when the support is in a compressed state, it can reduce the radial volume of the support and reduce the pushing resistance.

[0023] The above-mentioned technical features can be combined in various suitable ways or replaced by equivalent technical features, as long as the purpose of the present invention can be achieved. Attached Figure Description

[0024] The invention will be more fully understood from the following detailed description taken in conjunction with the accompanying drawings, wherein similar elements are numbered in a similar manner, wherein:

[0025] Figure 1 A schematic diagram of a support structure according to an embodiment of the present invention is shown, wherein the support is in a planar unfolded state;

[0026] Figure 2 A schematic diagram of a stent structure with developing marks according to an embodiment of the present invention is shown, the stent being in a planar unfolded state;

[0027] Figure 3 A schematic diagram of a stent structure with radiopaque markings according to an embodiment of the present invention is shown, the stent being in a three-dimensional state;

[0028] Figure 4 A schematic diagram of a support structure according to another embodiment of the present invention is shown, wherein the support is in a planar unfolded state;

[0029] Figure 5 A schematic diagram of a stent structure with developing marks according to another embodiment of the present invention is shown, the stent being in a planar unfolded state;

[0030] Figure 6 The image shows a stent in DAS route mode, with the imaging marker in the middle of the stent positioned at the tumor orifice.

[0031] Figure 7 The stent is shown in DAS imaging mode, with the stent fully deployed and the imaging markers clearly indicating the stent's open state.

[0032] Figure 8 The bracket exhibits excellent wall-adhering performance at a bending radius of 4 mm;

[0033] Figure 9 A schematic diagram of a support structure according to another embodiment of the present invention is shown. The support is in a planar unfolded state, and a groove-shaped structure is provided on the fixing rod of the proximal portion of the support.

[0034] List of reference numerals in the attached diagram:

[0035] 1-Proximal portion; 2-First main body portion; 3-Second main body portion; 4-Distal portion; 5-First annular wave support rod; 6-Second annular wave support rod; 7-V-shaped structure; 8-Y-shaped structure; 9-Development mark; 10-Fixing part; 11-Fixing rod; 12-Conical opening; 13-Groove structure; 14-Middle portion. Detailed Implementation

[0036] The technical solution of the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings, but the present invention is not limited to the following embodiments.

[0037] In this invention, the proximal portion 1 refers to the end of the stent closest to the operator after implantation into the blood vessel, and the distal portion 4 is the end furthest from the operator. Figures 1 to 5 In the structure, the proximal portion 1 is located on the right side of the support, and the distal portion 4 is located on the left side of the support. The peaks and troughs are defined as follows: with the proximal end of the support as the origin, along the axial direction of the support, from the proximal end to the distal end of the support as the positive axial direction, the coordinates of the peaks of the same annular wave support rod are greater than the coordinates of their troughs.

[0038] like Figures 1 to 5 As shown, this embodiment provides a support, which includes a proximal portion 1, a first main body portion 2, an intermediate portion 14, a second main body portion 3, and a distal portion 4 connected sequentially from the proximal end to the distal end; wherein, the proximal portion 1, the first main body portion 2, the intermediate portion 14, the second main body portion 3, and the distal portion 4 are all composed of annular wave-shaped support rods; the first main body portion 2 and the second main body portion 3 are both composed of alternately arranged first annular wave-shaped support rods 5 and second annular wave-shaped support rods 6, both of which are Z-shaped waveforms, and each Z-shaped waveform includes multiple V-shaped structures 7; the axial length of the Z-shaped waveform of the first annular wave-shaped support rod 5 is greater than the axial length of the Z-shaped waveform of the second annular wave-shaped support rod 6; a developing mark 9 is provided on the intermediate portion 14.

[0039] The first annular waveform support rod 5 and the second annular waveform support rod 6 have approximately the same waveform, that is, the ratio of wavelength to amplitude is constant. However, the axial length of the Z-shaped waveform of the first annular waveform support rod 5 is greater than the axial length of the Z-shaped waveform of the second annular waveform support rod 6. In other words, the first annular waveform support rod 5 has a larger amplitude than the second annular waveform support rod 6, and correspondingly, the first annular waveform support rod 5 has a longer wavelength than the second annular waveform support rod 6.

[0040] Optionally, the wavelength ratio of the first annular wave support rod 5 to the wavelength ratio of the second annular wave support rod 6 is 3:2, meaning the total wavelength of the two V-shaped structures 7 of the first annular wave support rod 5 is equal to the total wavelength of the three V-shaped structures 7 of the second annular wave support rod 6. Optionally, the first annular wave support rod 5 includes eight V-shaped structures 7, and the second annular wave support rod 6 includes twelve V-shaped structures 7. Since the wavelength ratio of the first annular wave support rod 5 to the wavelength ratio of the second annular wave support rod 6 is 3:2, the total circumferential and radial length of the first annular wave support rod 5 is equal to the total circumferential and radial length of the second annular wave support rod 6, meaning the total wavelength of the first annular wave support rod 5 is equal to the total wavelength of the second annular wave support rod 6.

[0041] In the axial direction, the number of annular corrugated support rods constituting the bracket is set according to actual needs. The first main body and the second main body may include the same number or different numbers of annular corrugated support rods; optionally, such as Figure 1 As shown, the first main body part 2 and the second main body part 3 of the bracket can each include 6 annular wave support rods, of which 3 are first annular wave support rods 5 and 3 are second annular wave support rods 6.

[0042] Optionally, the cross-sectional dimension of the first annular wave support rod 5 is larger than that of the second annular wave support rod 6, that is, the second annular wave support rod 6 is thinner than the first annular wave support rod 5.

[0043] Both the first main body 2 and the second main body 3 are composed of alternating first annular wave-shaped support rods 5 and second annular wave-shaped support rods 6. The alternating arrangement of the first annular wave-shaped support rods 5 and 6 ensures uniform axial connection strength and radial support force distribution, and makes the bracket deform evenly during expansion, contraction, or bending. Simultaneously, the second annular wave-shaped support rod 6 has a shorter axial length, resulting in greater flexibility, expansion performance, and bending performance compared to a bracket composed entirely of first annular wave-shaped support rods 5. Furthermore, the second annular wave-shaped support rod 6 is thinner than the first annular wave-shaped support rod 5, making the bracket easier to expand and contract at the second annular wave-shaped support rod 6, resulting in superior expansion performance compared to a bracket composed entirely of first annular wave-shaped support rods 5. The cross-sectional dimension of the first annular wave-shaped support rod 5 is larger than that of the second annular wave-shaped support rod 6, resulting in greater radial support force at the first annular wave-shaped support rod 5, and overall greater radial support force compared to a bracket composed entirely of second annular wave-shaped support rods 6.

[0044] Meanwhile, the support structure is simple and easy to implement.

[0045] The middle portion 14 of the stent is provided with a development mark 9, which facilitates the determination of the specific position of the middle portion 14 of the stent after the stent is fully released.

[0046] Using this bracket, the Z-shaped waveform of the first annular wave support rod 5 has a longer axial length than the Z-shaped waveform of the second annular wave support rod 6, thereby giving the bracket a higher radial support force and greatly enhancing its flexibility and expansion performance, as well as improving its bending performance. At the same time, the structure is simple and easy to implement. The middle part 14 is provided with a development mark, which is helpful to determine the specific position of the middle part 14 of the bracket after it is fully released.

[0047] In one embodiment, the middle portion 14 includes two first annular wave support rods 5 and a portion of the V-shaped structure 7 of the middle portion 14 is replaced by a Y-shaped structure 8. The Y-shaped structure 8 has a rod-shaped fixing part 10 parallel to the axial direction of the support, and a developing mark 9 is provided on the fixing part 10.

[0048] In this embodiment, the rod-shaped fixing part 10 of the Y-shaped structure 8 provides a fixed position for the developing mark 9, which is beneficial for the installation and fixing of the developing mark 9.

[0049] In one embodiment, the connection point of the middle portion 14 is formed at the point where the top end of the V-shaped structure 7 of the first annular wave support rod 5 adjacent to the first main body portion 2 and the top end of the V-shaped structure 7 of the first annular wave support rod 5 adjacent to the second main body portion 3.

[0050] The Y-shaped structure 8 is entirely an open-loop structure, that is, the rod-shaped fixing part 10 of the Y-shaped structure 8, which is adjacent to the first annular wave support rod 5 of the first main body part 2 in the middle part 14, has a free end facing the second main body part 3.

[0051] Some of the V-shaped structures 7 are open-loop structures, while the rest of the V-shaped structures 7 are closed-loop structures.

[0052] When the V-shaped structure 7 of the first annular wave support rod 5 adjacent to the first main body part 2 in the middle part 14 is arranged adjacent to the Y-shaped structure 8 of the first annular wave support rod 5 adjacent to the second main body part 3 in the middle part 14, the V-shaped structure 7 is an open-loop structure, that is, the top of the V-shaped structure 7 is not connected to other parts of the bracket; when the V-shaped structure 7 of the first annular wave support rod 5 adjacent to the first main body part 2 in the middle part 14 is arranged adjacent to the first annular wave support rod 5 adjacent to the second main body part 3 in the middle part 14, the V-shaped structure 7 is a closed-loop structure, that is, the top of the V-shaped structure 7 is connected to other parts of the bracket.

[0053] Similarly, when the V-shaped structure 7 of the first annular wave support rod 5 adjacent to the second main body part 3 in the middle part 14 is adjacent to the Y-shaped structure 8 of the first annular wave support rod 5 adjacent to the first main body part 2 in the middle part 14, the V-shaped structure 7 is an open-loop structure, that is, the top of the V-shaped structure 7 is not connected to other parts of the bracket; when the V-shaped structure 7 of the first annular wave support rod 5 adjacent to the second main body part 3 in the middle part 14 is adjacent to the first annular wave support rod 5 adjacent to the first main body part 2 in the middle part 14, the V-shaped structure 7 is a closed-loop structure, that is, the top of the V-shaped structure 7 is connected to other parts of the bracket.

[0054] The closed-loop V-shaped structure 7 in the middle part 14 provides sufficient support for the support; while the open-loop V-shaped structure 7 and Y-shaped structure 8 can effectively avoid excessive support, and due to their greater degree of bending freedom, they ensure the flexibility of the support.

[0055] Through this implementation, the middle part 14 has sufficient support without being too large, and the flexibility of the support is also guaranteed.

[0056] In one implementation, such as Figures 1 to 5As shown, the middle portion 14 is adjacent to the first annular wave support rod 5 of the first main body portion 2, and the multiple Y-shaped structures 8 are evenly distributed circumferentially, with the free end of the fixing part 10 of the Y-shaped structure 8 pointing towards the second main body portion 3. The middle portion 14 is adjacent to the second main body portion 3, and the multiple Y-shaped structures 8 are evenly distributed circumferentially, with the free end of the fixing part 10 of the Y-shaped structure 8 pointing towards the first main body portion 2. The free end of the fixing part 10 of the first annular wave support rod 5 of the middle portion 14 adjacent to the first main body portion 2 is axially spaced from the free end of the fixing part 10 of the first annular wave support rod 5 of the middle portion 14 adjacent to the second main body portion 3.

[0057] The free end of the fixing part 10 of the first annular wave support rod 5 adjacent to the first main body part 2 in the middle part 14 is axially spaced from the free end of the fixing part 10 of the first annular wave support rod 5 adjacent to the second main body part 3. That is, the axial length of the Y-shaped structure 8 of the first annular wave support rod 5 is less than or equal to the axial length of the V-shaped structure 7 of the first annular wave support rod 5, thus achieving the spaced free ends. This avoids the fixing part 10 of the first annular wave support rod 5 adjacent to the first main body part 2 and the fixing part 10 of the first annular wave support rod 5 adjacent to the second main body part 3 coinciding axially. Therefore, the developing mark 9 of the first main body part 2 and the developing mark 9 of the second main body part 3 do not coincide axially, so that, in the compressed state, the overall transmissive length of the middle part is twice the length of the developing mark 9. This twice-length allows for better observation by the operator.

[0058] More importantly, the free end of the fixing part 10 of the first annular wave support rod 5 adjacent to the first main body part 2 in the middle part 14 is axially spaced from the free end of the fixing part 10 of the first annular wave support rod 5 adjacent to the second main body part 3 in the middle part 14, so that the developing mark 9 of the first annular wave support rod 5 adjacent to the first main body part 2 in the middle part 14 is axially spaced from the developing mark 9 of the first annular wave support rod 5 adjacent to the second main body part 3 in the middle part 14. When the support is in a compressed state, the radial volume of the support can be reduced, and the pushing resistance can be reduced.

[0059] This implementation method facilitates the uniform distribution of the imaging marks 9 in the middle portion 14 of the stent, and allows the imaging marks 9 to clearly indicate the open state of the middle portion of the stent after the stent is fully released; and when the stent is in a compressed state, it can reduce the radial volume of the stent and reduce the pushing resistance.

[0060] In one implementation, such as Figures 1 to 3As shown, each Y-shaped structure 8 of the first annular wave support rod 5 adjacent to the first main body part 2 in the middle part 14 is staggered with each Y-shaped structure 8 of the first annular wave support rod 5 adjacent to the second main body part 3 in the middle part 14 in the circumferential direction; the included angle between the centers of two adjacent Y-shaped structures 8 is a fixed value, wherein the two adjacent Y-shaped structures 8 belong to the two first annular wave support rods 5 of the middle part 14 respectively.

[0061] The staggered Y-shaped structure 8 reduces pushing resistance. Simultaneously, in the compressed state, because the developing marks 9 of the first annular wave-shaped support rod 5 adjacent to the first main body part 2 and the first annular wave-shaped support rod 5 adjacent to the second main body part 3 in the middle part 14 do not coincide axially, the overall non-transparent length of the middle section is twice the length of the developing marks 9. This double length facilitates better observation by the operator. After the support is opened, the developing marks 9 help the operator locate the support position.

[0062] This implementation method helps to reduce the radial volume of the stent and reduce pushing resistance when the stent is in a compressed state; after the stent is opened, the imaging mark 9 helps the operator to locate the position of the middle part 14 of the stent.

[0063] In one implementation, such as Figure 4 and Figure 5 As shown, each Y-shaped structure 8 of the first annular wave support rod 5 adjacent to the first main body part 2 in the middle part 14 is arranged collinearly with each Y-shaped structure 8 of the first annular wave support rod 5 adjacent to the second main body part 3 in the middle part 14.

[0064] In the compressed state, since the development mark 9 of the first annular wave support rod 5 adjacent to the first main body part 2 in the middle part 14 does not coincide with the development mark 9 of the first annular wave support rod 5 adjacent to the second main body part 3 in the middle part 14 in the axial direction, the overall non-transmissive length of the middle part is twice the length of the development mark 9. This double length is beneficial for the operator to observe better.

[0065] The collinear Y-shaped structure 8 facilitates easier fixation of the developing marks 9.

[0066] Optional, such as Figure 5 As shown, the two collinear development marks 9 can form a whole, which makes it easier to observe and locate the development marks 9.

[0067] This implementation method facilitates the more convenient fixation of the developing mark 9 and makes the developing mark 9 easier to observe and locate.

[0068] In one implementation, such as Figures 1 to 3As shown, the first annular wave support rod 5 adjacent to the first main body part 2 in the middle part 14 and the first annular wave support rod 5 adjacent to the second main body part 3 in the middle part 14 both include two Y-shaped structures 8.

[0069] The two Y-shaped structures 8 of the first annular wave-shaped support rod 5 adjacent to the first main body part 2 in the middle portion 14 are arranged at 180 degrees apart, and the two Y-shaped structures 8 of the first annular wave-shaped support rod 5 adjacent to the second main body part 2 in the middle portion 14 are also arranged at 180 degrees apart. There are three V-shaped structures 7 between the two Y-shaped structures 8 of the first annular wave-shaped support rod 5 adjacent to the first main body part 2 in the middle portion 14; and there are three V-shaped structures 7 between the two Y-shaped structures 8 of the first annular wave-shaped support rod 5 adjacent to the second main body part 3 in the middle portion 14.

[0070] Optionally, each Y-shaped structure 8 of the first annular wave support rod 5 adjacent to the first main body part 2 in the middle part 14 is staggered with each Y-shaped structure 8 of the first annular wave support rod 5 adjacent to the second main body part 3 in the middle part 14. The included angle between the centers of two adjacent Y-shaped structures 8 is 90 degrees. Each of the two adjacent Y-shaped structures 8 includes a V-shaped structure 7 of the first annular wave support rod 5 adjacent to the first main body part 2 in the middle part 14 and a V-shaped structure 7 of the first annular wave support rod 5 adjacent to the second main body part 3 in the middle part 14. A V-shaped structure 7 of the first annular wave support rod 5 adjacent to the first main body part 2 in the middle part 14 and a V-shaped structure 7 of the first annular wave support rod 5 adjacent to the second main body part 3 in the middle part 14 are provided between the two adjacent Y-shaped structures 8.

[0071] Optionally, each Y-shaped structure 8 of the first annular wave support rod 5 adjacent to the first main body part 2 in the middle part 14 is collinearly arranged with each Y-shaped structure 8 of the first annular wave support rod 5 adjacent to the second main body part 3 in the middle part 14, and the included angle between the centers of two adjacent Y-shaped structures 8 is 180 degrees.

[0072] Optional, such as Figure 4 and Figure 5 As shown, the first annular wave support rod 5 adjacent to the first main body part 2 and the first annular wave support rod 5 adjacent to the second main body part 3 in the middle part 14 both include 4 Y-shaped structures 8; each Y-shaped structure 8 of the first annular wave support rod 5 adjacent to the first main body part 2 in the middle part 14 is collinearly arranged with each Y-shaped structure 8 of the first annular wave support rod 5 adjacent to the second main body part 3 in the middle part 14, and the included angle between the centers of two adjacent Y-shaped structures 8 is 90 degrees.

[0073] With this embodiment, having a sufficient number of development marks 9 facilitates the clear identification of the open state of the middle part of the stent after the stent is fully released.

[0074] In one embodiment, the density of the Z-shaped waveform of the first annular waveform support rod 5 in the circumferential direction is less than the density of the Z-shaped waveform of the second annular waveform support rod 6 in the circumferential direction; the circumferential width of each V-shaped structure 7 of the Z-shaped waveform of the first annular waveform support rod 5 is greater than the circumferential width of each V-shaped structure 7 of the Z-shaped waveform of the second annular waveform support rod 6.

[0075] Optionally, the ratio of the density of the Z-shaped waveform in the circumferential direction of the first annular waveform support rod 5 to the density of the Z-shaped waveform in the circumferential direction of the second annular waveform support rod 6 is 2 to 3. The ratio of the circumferential width of each V-shaped structure 7 of the Z-shaped waveform of the first annular waveform support rod 5 to the circumferential width of each V-shaped structure 7 of the Z-shaped waveform of the second annular waveform support rod 6 is 3 to 2.

[0076] With this implementation method, the Z-shaped waveform of the second annular waveform support rod 6 has a low density in the circumferential direction, which is beneficial to improving the expansion performance of the support.

[0077] In one implementation, such as Figures 1 to 5 As shown, a connection point is formed between the first annular waveform support rod 5 and the second annular waveform support rod 6. The connection point is located at the point where the trough of the Z-shaped waveform of the first annular waveform support rod 5 meets the peak of the Z-shaped waveform of the second annular waveform support rod 6, and at the point where the peak of the Z-shaped waveform of the first annular waveform support rod 5 meets the trough of the Z-shaped waveform of the second annular waveform support rod 6.

[0078] Optionally, the wavelength ratio of the first annular waveform support rod 5 to the wavelength ratio of the second annular waveform support rod 6 is 3:2. Optionally, the first annular waveform support rod 5 includes 8 V-shaped structures 7, and the second annular waveform support rod 6 includes 12 V-shaped structures 7.

[0079] Therefore, at the connection between the first annular waveform support rod 5 and the second annular waveform support rod 6, the peaks or troughs of the first annular waveform support rod 5 are alternately distributed in closed and open loops. That is, there is an open loop peak or trough between the peaks or troughs of two adjacent closed loops of the second annular waveform support rod 6; and there are two open loop peaks or troughs between the peaks or troughs of two adjacent closed loops of the second annular waveform support rod 6.

[0080] Optionally, the first annular wave support rod 5 has 4 closed-loop peaks, 4 open-loop peaks, 4 closed-loop troughs, and 4 open-loop troughs; the second annular wave support rod 6 has 4 closed-loop peaks, 8 open-loop peaks, 4 closed-loop troughs, and 8 open-loop troughs.

[0081] The peaks or troughs of the closed-loop annular wave support rod can provide greater support force, ensuring that the support has sufficient support force. At the same time, because the support has open-loop peaks or troughs, the support force of the support will not be too large. Furthermore, since the open-loop peaks or troughs are not connected to other parts of the support, they have a greater degree of freedom in bending, ensuring the flexibility of the support.

[0082] This implementation method ensures that the support has sufficient support without being excessive, while also guaranteeing the support's flexibility.

[0083] In one implementation, such as Figure 4 and Figure 5 As shown, the proximal portion 1 includes two first annular wave-shaped support rods 5 arranged axially side by side; or, as... Figure 1 and Figure 2 As shown, the proximal portion 1 includes two second annular wave-shaped support rods 6 arranged axially side by side; and / or as shown in the figure. Figure 4 and Figure 5 As shown, the distal portion 4 includes two first annular wave-shaped support rods 5 arranged axially side by side; or, as... Figure 1 and Figure 2 As shown, the distal portion 4 includes two second annular wave-shaped support rods 6 arranged axially side by side.

[0084] This implementation method facilitates the formation of a closed-loop design for the proximal portion 1 and the distal portion 4, effectively preventing the free end from puncturing the blood vessel wall.

[0085] In one embodiment, the proximal portion 1 includes two first annular wave-shaped support rods 5 arranged axially side by side, and the first main body portion 2 is connected to the proximal portion 1 via second annular wave-shaped support rods 6; the proximal portion 1 also includes two second annular wave-shaped support rods 6 arranged axially side by side, and the first main body portion 2 is connected to the proximal portion 1 via first annular wave-shaped support rods 5; the distal portion 4 includes two first annular wave-shaped support rods 5 arranged axially side by side, and the second main body portion 3 is connected to the distal portion 4 via second annular wave-shaped support rods 6; the distal portion 4 also includes two second annular wave-shaped support rods 6 arranged axially side by side, and the second main body portion 3 is connected to the distal portion 4 via first annular wave-shaped support rods 5.

[0086] With this implementation, since there are fewer connection points between the proximal portion 1 and the first main body portion 2 and fewer connection points between the distal portion 4 and the second main body portion 3, it is beneficial to form a tapered opening.

[0087] In one implementation, such as Figure 3As shown, the connection between the proximal portion 1 and the first main body portion 2 forms a conical opening 12 after the support is unfolded, and the angle between the generatrix of the conical opening 12 and the axis is 30 to 60 degrees; the connection between the distal portion 4 and the second main body portion 3 forms a conical opening 12 after the support is unfolded, and the angle between the generatrix of the conical opening 12 and the axis is 30 to 60 degrees.

[0088] By implementing this method, the outwardly expanding conical opening 12 can enhance the radial support force at both ends of the stent, effectively solving the problem of stent displacement caused by blood flow impact in the blood vessel.

[0089] In one implementation, such as Figures 1 to 5 As shown, fixing rods 11 are arranged on the first annular wave support rod 5 or the second annular wave support rod 6, which are located in the proximal portion 1 away from the first main body portion 2 or in the distal portion 4 away from the second main body portion 3; in the distal portion 4, the fixing rods 11 extend from the crest of the Z-shaped waveform of the first annular wave support rod 5 or the second annular wave support rod 6; in the proximal portion 1, the fixing rods 11 extend from the trough of the Z-shaped waveform of the first annular wave support rod 5 or the second annular wave support rod 6; a plurality of fixing rods 11 are evenly distributed circumferentially; and developing marks 9 are provided on the fixing rods 11.

[0090] With this embodiment, the distal portion 4 and proximal portion 1 of the stent can be effectively located by means of the imaging marker 9.

[0091] In one implementation, such as Figures 1 to 5 As shown, both the proximal portion 1 and the distal portion 4 include four fixing rods 11.

[0092] With this embodiment, having a sufficient number of imaging marks 9 facilitates the clear identification of the open state of the proximal portion 1 and the distal portion 4 of the stent after it has been fully released.

[0093] In one embodiment, the developing mark 9 is a non-transparent spring or a developing metal ring, and the developing mark 9 is fixed to the bracket by laser welding or adhesive bonding.

[0094] In one embodiment, the developing mark 9 may also be disposed within the groove structure 13.

[0095] like Figure 9 As shown, the fixing rod 11 has a groove structure 13, and the developing mark 9 can be set in the groove structure 13.

[0096] The fixing part 10 may also have a groove structure 13, and the developing mark 9 may be set in the groove structure 13.

[0097] This embodiment can securely fix the developing mark 9 to the bracket, which helps to improve the safety performance of the bracket.

[0098] In one embodiment, the support is formed by laser-cutting an alloy tube.

[0099] When the alloy tubes are cut into supports using the same cutting pattern, the smaller the included angle between adjacent rods (i.e., the smaller the apex angle of the V-shaped structure 7), the smaller the support diameter; conversely, the larger the included angle between adjacent rods (i.e., the larger the apex angle of the V-shaped structure 7), the larger the support diameter. The size of the included angle between adjacent rods can be adjusted through methods such as diameter expansion and heat setting. Heat setting is applied to the support after diameter expansion and can be performed multiple times to better adjust the support diameter.

[0100] This implementation method facilitates the manufacturing of the stent.

[0101] Example 1

[0102] like Figures 1 to 5 As shown, this embodiment provides a support, which includes a proximal portion 1, a first main body portion 2, an intermediate portion 14, a second main body portion 3, and a distal portion 4 connected sequentially from the proximal end to the distal end; wherein, the proximal portion 1, the first main body portion 2, the intermediate portion 14, the second main body portion 3, and the distal portion 4 are all composed of annular wave-shaped support rods; the first main body portion 2 and the second main body portion 3 are both composed of alternately arranged first annular wave-shaped support rods 5 and second annular wave-shaped support rods 6, both of which are Z-shaped waveforms, and each Z-shaped waveform includes multiple V-shaped structures 7; the axial length of the Z-shaped waveform of the first annular wave-shaped support rod 5 is greater than the axial length of the Z-shaped waveform of the second annular wave-shaped support rod 6; a developing mark 9 is provided on the intermediate portion 14.

[0103] The first annular waveform support rod 5 and the second annular waveform support rod 6 have approximately the same waveform, that is, the ratio of wavelength to amplitude is constant. However, the axial length of the Z-shaped waveform of the first annular waveform support rod 5 is greater than the axial length of the Z-shaped waveform of the second annular waveform support rod 6. In other words, the first annular waveform support rod 5 has a larger amplitude than the second annular waveform support rod 6, and correspondingly, the first annular waveform support rod 5 has a longer wavelength than the second annular waveform support rod 6.

[0104] Optionally, the wavelength ratio of the first annular wave support rod 5 to the wavelength ratio of the second annular wave support rod 6 is 3:2, meaning the total wavelength of the two V-shaped structures 7 of the first annular wave support rod 5 is equal to the total wavelength of the three V-shaped structures 7 of the second annular wave support rod 6. Optionally, the first annular wave support rod 5 includes eight V-shaped structures 7, and the second annular wave support rod 6 includes twelve V-shaped structures 7. Since the wavelength ratio of the first annular wave support rod 5 to the wavelength ratio of the second annular wave support rod 6 is 3:2, the total circumferential and radial length of the first annular wave support rod 5 is equal to the total circumferential and radial length of the second annular wave support rod 6, meaning the total wavelength of the first annular wave support rod 5 is equal to the total wavelength of the second annular wave support rod 6.

[0105] In the axial direction, the number of annular corrugated support rods constituting the bracket is set according to actual needs. The first main body and the second main body may include the same number or different numbers of annular corrugated support rods; optionally, such as Figure 1 As shown, the first main body part 2 and the second main body part 3 of the bracket can each include 6 annular wave support rods, of which 3 are first annular wave support rods 5 and 3 are second annular wave support rods 6.

[0106] Optionally, the cross-sectional dimension of the first annular wave support rod 5 is larger than that of the second annular wave support rod 6, that is, the second annular wave support rod 6 is thinner than the first annular wave support rod 5.

[0107] Both the first main body 2 and the second main body 3 are composed of alternating first annular wave-shaped support rods 5 and second annular wave-shaped support rods 6. The alternating arrangement of the first annular wave-shaped support rods 5 and 6 ensures uniform axial connection strength and radial support force distribution, and makes the bracket deform evenly during expansion, contraction, or bending. Simultaneously, the second annular wave-shaped support rod 6 has a shorter axial length, resulting in greater flexibility, expansion performance, and bending performance compared to a bracket composed entirely of first annular wave-shaped support rods 5. Furthermore, the second annular wave-shaped support rod 6 is thinner than the first annular wave-shaped support rod 5, making the bracket easier to expand and contract at the second annular wave-shaped support rod 6, resulting in superior expansion performance compared to a bracket composed entirely of first annular wave-shaped support rods 5. The cross-sectional dimension of the first annular wave-shaped support rod 5 is larger than that of the second annular wave-shaped support rod 6, resulting in greater radial support force at the first annular wave-shaped support rod 5, and overall greater radial support force compared to a bracket composed entirely of second annular wave-shaped support rods 6.

[0108] Meanwhile, the support structure is simple and easy to implement.

[0109] The middle portion 14 of the stent is provided with a development mark 9, which facilitates the determination of the specific position of the middle portion 14 of the stent after the stent is fully released.

[0110] Using this bracket, the Z-shaped waveform of the first annular wave support rod 5 has a longer axial length than the Z-shaped waveform of the second annular wave support rod 6, thereby giving the bracket a higher radial support force and greatly enhancing its flexibility and expansion performance, as well as improving its bending performance. At the same time, the structure is simple and easy to implement. The middle part 14 is provided with a development mark, which is helpful to determine the specific position of the middle part 14 of the bracket after it is fully released.

[0111] Example 2

[0112] In one embodiment, the intermediate portion 14 includes two first annular wave-shaped support rods 5, and a portion of the V-shaped structure 7 of the intermediate portion 14 is replaced by a Y-shaped structure 8. The Y-shaped structure 8 has a rod-shaped fixing part 10 parallel to the axial direction of the support, and a developing mark 9 is provided on the fixing part 10. The rod-shaped fixing part 10 of the Y-shaped structure 8 provides a fixed position for the developing mark 9, which is beneficial for the installation and fixation of the developing mark 9.

[0113] The connection point of the middle part 14 is formed at the top of the V-shaped structure 7 of the first annular wave support rod 5 adjacent to the first main body part 2 and the top of the V-shaped structure 7 of the first annular wave support rod 5 adjacent to the second main body part 3.

[0114] The Y-shaped structure 8 is entirely an open-loop structure, that is, the rod-shaped fixing part 10 of the Y-shaped structure 8, which is adjacent to the first annular wave support rod 5 of the first main body part 2 in the middle part 14, has a free end facing the second main body part 3.

[0115] Some of the V-shaped structures 7 are open-loop structures, while the rest of the V-shaped structures 7 are closed-loop structures.

[0116] When the V-shaped structure 7 of the first annular wave support rod 5 adjacent to the first main body part 2 in the middle part 14 is arranged adjacent to the Y-shaped structure 8 of the first annular wave support rod 5 adjacent to the second main body part 3 in the middle part 14, the V-shaped structure 7 is an open-loop structure, that is, the top of the V-shaped structure 7 is not connected to other parts of the bracket; when the V-shaped structure 7 of the first annular wave support rod 5 adjacent to the first main body part 2 in the middle part 14 is arranged adjacent to the first annular wave support rod 5 adjacent to the second main body part 3 in the middle part 14, the V-shaped structure 7 is a closed-loop structure, that is, the top of the V-shaped structure 7 is connected to other parts of the bracket.

[0117] Similarly, when the V-shaped structure 7 of the first annular wave support rod 5 adjacent to the second main body part 3 in the middle part 14 is adjacent to the Y-shaped structure 8 of the first annular wave support rod 5 adjacent to the first main body part 2 in the middle part 14, the V-shaped structure 7 is an open-loop structure, that is, the top of the V-shaped structure 7 is not connected to other parts of the bracket; when the V-shaped structure 7 of the first annular wave support rod 5 adjacent to the second main body part 3 in the middle part 14 is adjacent to the first annular wave support rod 5 adjacent to the first main body part 2 in the middle part 14, the V-shaped structure 7 is a closed-loop structure, that is, the top of the V-shaped structure 7 is connected to other parts of the bracket.

[0118] The closed-loop V-shaped structure 7 in the middle part 14 provides sufficient support for the support; while the open-loop V-shaped structure 7 and Y-shaped structure 8 can effectively avoid excessive support, and due to their greater degree of bending freedom, they ensure the flexibility of the support.

[0119] like Figures 1 to 5 As shown, the middle portion 14 is adjacent to the first annular wave support rod 5 of the first main body portion 2, and the multiple Y-shaped structures 8 are evenly distributed circumferentially, with the free end of the fixing part 10 of the Y-shaped structure 8 pointing towards the second main body portion 3. The middle portion 14 is adjacent to the second main body portion 3, and the multiple Y-shaped structures 8 are evenly distributed circumferentially, with the free end of the fixing part 10 of the Y-shaped structure 8 pointing towards the first main body portion 2. The free end of the fixing part 10 of the first annular wave support rod 5 of the middle portion 14 adjacent to the first main body portion 2 is axially spaced from the free end of the fixing part 10 of the first annular wave support rod 5 of the middle portion 14 adjacent to the second main body portion 3.

[0120] The free end of the fixing part 10 of the first annular wave support rod 5 adjacent to the first main body part 2 in the middle part 14 is axially spaced from the free end of the fixing part 10 of the first annular wave support rod 5 adjacent to the second main body part 3. That is, the axial length of the Y-shaped structure 8 of the first annular wave support rod 5 is less than or equal to the axial length of the V-shaped structure 7 of the first annular wave support rod 5, thus achieving the spaced free ends. This avoids the fixing part 10 of the first annular wave support rod 5 adjacent to the first main body part 2 and the fixing part 10 of the first annular wave support rod 5 adjacent to the second main body part 3 coinciding axially. Therefore, the developing mark 9 of the first main body part 2 and the developing mark 9 of the second main body part 3 do not coincide axially, so that, in the compressed state, the overall transmissive length of the middle part is twice the length of the developing mark 9. This twice-length allows for better observation by the operator.

[0121] More importantly, the free end of the fixing part 10 of the first annular wave support rod 5 adjacent to the first main body part 2 in the middle part 14 is axially spaced from the free end of the fixing part 10 of the first annular wave support rod 5 adjacent to the second main body part 3 in the middle part 14, so that the developing mark 9 of the first annular wave support rod 5 adjacent to the first main body part 2 in the middle part 14 is axially spaced from the developing mark 9 of the first annular wave support rod 5 adjacent to the second main body part 3 in the middle part 14. When the support is in a compressed state, the radial volume of the support can be reduced, and the pushing resistance can be reduced.

[0122] like Figures 1 to 3 As shown, each Y-shaped structure 8 of the first annular wave support rod 5 adjacent to the first main body part 2 in the middle part 14 is staggered with each Y-shaped structure 8 of the first annular wave support rod 5 adjacent to the second main body part 3 in the middle part 14 in the circumferential direction; the included angle between the centers of two adjacent Y-shaped structures 8 is a fixed value, wherein the two adjacent Y-shaped structures 8 belong to the two first annular wave support rods 5 of the middle part 14 respectively.

[0123] The staggered Y-shaped structure 8 reduces pushing resistance. Simultaneously, in the compressed state, because the developing marks 9 of the first annular wave-shaped support rod 5 adjacent to the first main body part 2 and the first annular wave-shaped support rod 5 adjacent to the second main body part 3 in the middle part 14 do not coincide axially, the overall non-transmissive length of the middle section is twice the length of the developing marks 9. This double length facilitates better observation by the operator. After the support is opened, the developing marks 9 help the operator locate the support position.

[0124] like Figure 4 and Figure 5 As shown, each Y-shaped structure 8 of the first annular wave support rod 5 adjacent to the first main body part 2 in the middle part 14 is arranged collinearly with each Y-shaped structure 8 of the first annular wave support rod 5 adjacent to the second main body part 3 in the middle part 14.

[0125] In the compressed state, because the developing mark 9 of the first annular wave support rod 5 adjacent to the first main body part 2 in the middle part 14 does not coincide axially with the developing mark 9 of the first annular wave support rod 5 adjacent to the second main body part 3 in the middle part 14, the overall non-transmissive length of the middle part is twice the length of the developing mark 9. This twice-length facilitates better observation by the operator. The collinear Y-shaped structure 8 facilitates more convenient fixation of the developing mark 9 and makes the developing mark 9 easier to observe and position.

[0126] Optional, such as Figure 5 As shown, the two collinear developing marks 9 can form a single unit.

[0127] like Figures 1 to 3As shown, the first annular wave support rod 5 adjacent to the first main body part 2 in the middle part 14 and the first annular wave support rod 5 adjacent to the second main body part 3 in the middle part 14 both include two Y-shaped structures 8.

[0128] The two Y-shaped structures 8 of the first annular wave-shaped support rod 5 adjacent to the first main body part 2 in the middle portion 14 are arranged at 180 degrees apart, and the two Y-shaped structures 8 of the first annular wave-shaped support rod 5 adjacent to the second main body part 2 in the middle portion 14 are also arranged at 180 degrees apart. There are three V-shaped structures 7 between the two Y-shaped structures 8 of the first annular wave-shaped support rod 5 adjacent to the first main body part 2 in the middle portion 14; and there are three V-shaped structures 7 between the two Y-shaped structures 8 of the first annular wave-shaped support rod 5 adjacent to the second main body part 3 in the middle portion 14.

[0129] Optionally, each Y-shaped structure 8 of the first annular wave support rod 5 adjacent to the first main body part 2 in the middle part 14 is staggered with each Y-shaped structure 8 of the first annular wave support rod 5 adjacent to the second main body part 3 in the middle part 14. The included angle between the centers of two adjacent Y-shaped structures 8 is 90 degrees. Each of the two adjacent Y-shaped structures 8 includes a V-shaped structure 7 of the first annular wave support rod 5 adjacent to the first main body part 2 in the middle part 14 and a V-shaped structure 7 of the first annular wave support rod 5 adjacent to the second main body part 3 in the middle part 14. A V-shaped structure 7 of the first annular wave support rod 5 adjacent to the first main body part 2 in the middle part 14 and a V-shaped structure 7 of the first annular wave support rod 5 adjacent to the second main body part 3 in the middle part 14 are provided between the two adjacent Y-shaped structures 8.

[0130] Optionally, each Y-shaped structure 8 of the first annular wave support rod 5 adjacent to the first main body part 2 in the middle part 14 is collinearly arranged with each Y-shaped structure 8 of the first annular wave support rod 5 adjacent to the second main body part 3 in the middle part 14, and the included angle between the centers of two adjacent Y-shaped structures 8 is 180 degrees.

[0131] Optional, such as Figure 4 and Figure 5 As shown, both the first annular wave-shaped support rod 5 adjacent to the first main body part 2 and the first annular wave-shaped support rod 5 adjacent to the second main body part 3 in the middle part 14 include four Y-shaped structures 8. Each Y-shaped structure 8 of the first annular wave-shaped support rod 5 adjacent to the first main body part 2 in the middle part 14 is collinearly arranged with each Y-shaped structure 8 of the first annular wave-shaped support rod 5 adjacent to the second main body part 3 in the middle part 14, and the included angle between the centers of two adjacent Y-shaped structures 8 is 90 degrees. Because there are a sufficient number of development marks 9, it is beneficial for the development marks 9 to clearly indicate the open state of the middle part of the support after the support is fully released.

[0132] Example 3

[0133] The density of the Z-shaped waveform in the circumferential direction of the first annular waveform support rod 5 is less than the density of the Z-shaped waveform in the circumferential direction of the second annular waveform support rod 6; the circumferential width of each V-shaped structure 7 of the Z-shaped waveform of the first annular waveform support rod 5 is greater than the circumferential width of each V-shaped structure 7 of the Z-shaped waveform of the second annular waveform support rod 6.

[0134] Optionally, the ratio of the density of the Z-shaped waveform in the circumferential direction of the first annular waveform support rod 5 to the density of the Z-shaped waveform in the circumferential direction of the second annular waveform support rod 6 is 2 to 3. The ratio of the circumferential width of each V-shaped structure 7 of the Z-shaped waveform of the first annular waveform support rod 5 to the circumferential width of each V-shaped structure 7 of the Z-shaped waveform of the second annular waveform support rod 6 is 3 to 2.

[0135] like Figures 1 to 5 As shown, a connection point is formed between the first annular waveform support rod 5 and the second annular waveform support rod 6. The connection point is located at the point where the trough of the Z-shaped waveform of the first annular waveform support rod 5 meets the peak of the Z-shaped waveform of the second annular waveform support rod 6, and at the point where the peak of the Z-shaped waveform of the first annular waveform support rod 5 meets the trough of the Z-shaped waveform of the second annular waveform support rod 6.

[0136] Optionally, the wavelength ratio of the first annular waveform support rod 5 to the wavelength ratio of the second annular waveform support rod 6 is 3:2. Optionally, the first annular waveform support rod 5 includes 8 V-shaped structures 7, and the second annular waveform support rod 6 includes 12 V-shaped structures 7.

[0137] Therefore, at the connection between the first annular waveform support rod 5 and the second annular waveform support rod 6, the peaks or troughs of the first annular waveform support rod 5 are alternately distributed in closed and open loops. That is, there is an open loop peak or trough between the peaks or troughs of two adjacent closed loops of the second annular waveform support rod 6; and there are two open loop peaks or troughs between the peaks or troughs of two adjacent closed loops of the second annular waveform support rod 6.

[0138] Optionally, the first annular wave support rod 5 has 4 closed-loop peaks, 4 open-loop peaks, 4 closed-loop troughs, and 4 open-loop troughs; the second annular wave support rod 6 has 4 closed-loop peaks, 8 open-loop peaks, 4 closed-loop troughs, and 8 open-loop troughs.

[0139] The peaks or troughs of the closed-loop annular wave support rod can provide greater support force, ensuring that the support has sufficient support force. At the same time, because the support has open-loop peaks or troughs, the support force of the support will not be too large. Furthermore, since the open-loop peaks or troughs are not connected to other parts of the support, they have a greater degree of freedom in bending, ensuring the flexibility of the support.

[0140] Example 4

[0141] like Figure 4 and Figure 5 As shown, the proximal portion 1 includes two first annular wave-shaped support rods 5 arranged axially side by side; or, as... Figure 1 and Figure 2 As shown, the proximal portion 1 includes two second annular wave-shaped support rods 6 arranged axially side by side; and / or as shown in the figure. Figure 4 and Figure 5 As shown, the distal portion 4 includes two first annular wave-shaped support rods 5 arranged axially side by side; or, as... Figure 1 and Figure 2 As shown, the distal portion 4 includes two second annular wave support rods 6 arranged axially side by side; this facilitates the formation of a closed-loop design between the proximal portion 1 and the distal portion 4, effectively preventing the free end from puncturing the blood vessel wall.

[0142] The proximal portion 1 includes two axially parallel first annular wave-shaped support rods 5, and the first main body portion 2 is connected to the proximal portion 1 via second annular wave-shaped support rods 6. The proximal portion 1 also includes two axially parallel second annular wave-shaped support rods 6, and the first main body portion 2 is connected to the proximal portion 1 via first annular wave-shaped support rods 5. The distal portion 4 includes two axially parallel first annular wave-shaped support rods 5, and the second main body portion 3 is connected to the distal portion 4 via second annular wave-shaped support rods 6. The distal portion 4 also includes two axially parallel second annular wave-shaped support rods 6, and the second main body portion 3 is connected to the distal portion 4 via first annular wave-shaped support rods 5. Because the proximal portion 1 has fewer connection points with the first main body portion 2 and the distal portion 4 has fewer connection points with the second main body portion 3, it is beneficial to form a tapered opening.

[0143] like Figure 3 As shown, the connection between the proximal portion 1 and the first main body portion 2 forms a conical opening 12 after the stent is deployed, with the generatrix of the conical opening 12 forming an angle of 30 to 60 degrees with the axis. Similarly, the connection between the distal portion 4 and the second main body portion 3 also forms a conical opening 12 after the stent is deployed, with the generatrix of the conical opening 12 forming an angle of 30 to 60 degrees with the axis. The outwardly flared conical opening 12 enhances the radial support force at both ends of the stent, effectively addressing the displacement problem caused by blood flow impact within the blood vessel.

[0144] like Figures 1 to 5As shown, fixing rods 11 are arranged on the first annular wave support rod 5 or the second annular wave support rod 6, which are located in the proximal portion 1 away from the first main body portion 2 or in the distal portion 4 away from the second main body portion 3. In the distal portion 4, the fixing rods 11 extend from the crest of the Z-shaped waveform of the first annular wave support rod 5 or the second annular wave support rod 6. In the proximal portion 1, the fixing rods 11 extend from the trough of the Z-shaped waveform of the first annular wave support rod 5 or the second annular wave support rod 6. The multiple fixing rods 11 are evenly distributed circumferentially. The fixing rods 11 are provided with developing marks 9, so that the distal portion 4 and the proximal portion 1 of the support can be effectively positioned by means of the developing marks 9.

[0145] In one implementation, such as Figures 1 to 5 As shown, both the proximal portion 1 and the distal portion 4 include four retaining rods 11. The presence of a sufficient number of imaging markers 9 facilitates clear identification of the open state of the proximal portion 1 and the distal portion 4 of the stent after complete release.

[0146] DAS mode

[0147] like Figure 6 As shown, in DAS routing mode, the four contrast markers 9 in the middle of the stent are positioned at the aneurysm inlet, keeping the relative position of the stent unchanged, allowing the stent to be released in situ, which greatly facilitates the operator in positioning the stent. Figure 7 As shown, in DAS imaging mode, after the stent is fully deployed, the four contrast markers 9 in the center clearly indicate the stent's open state. Figure 8 As shown, the bracket exhibits excellent wall-adhesion performance at a bending radius of 4 mm.

[0148] The embodiments of the present invention are not limited to those described above. Without departing from the spirit and scope of the present invention, those skilled in the art can make various changes and improvements to the present invention in form and detail, and these are all considered to fall within the protection scope of the present invention.

Claims

1. A support, characterized in that, The device comprises a proximal portion, a first main body portion, an intermediate portion, a second main body portion, and a distal portion, connected sequentially from proximal to distal. Each of these portions—the proximal portion, the first main body portion, the intermediate portion, the second main body portion, and the distal portion—is composed of annular wave-shaped support rods. Both the first and second main body portions are composed of alternately arranged first and second annular wave-shaped support rods, each with a Z-shaped waveform, including multiple V-shaped structures. The axial length of the Z-shaped waveform of the first annular wave-shaped support rod is greater than the axial length of the Z-shaped waveform of the second annular wave-shaped support rod. The intermediate portion has development marks and includes two first annular wave-shaped support rods, with some of the V-shaped structures in the intermediate portion being replaced by Y-shaped structures.

2. The bracket according to claim 1, characterized in that, The Y-shaped structure has a rod-shaped fixing part parallel to the axis of the support, and the fixing part is provided with a developing mark.

3. The bracket according to claim 1 or 2, characterized in that, The connection point of the middle portion is formed at the point where the top end of the V-shaped structure of the first annular wave support rod adjacent to the first main body portion meets the top end of the V-shaped structure of the first annular wave support rod adjacent to the second main body portion.

4. The stent according to claim 3, characterized in that, The plurality of Y-shaped structures of the first annular wave support rod of the middle part adjacent to the first main body part are evenly distributed circumferentially, and the free end of the fixed part of the Y-shaped structure points to the second main body part; the plurality of Y-shaped structures of the first annular wave support rod of the middle part adjacent to the second main body part are evenly distributed circumferentially, and the free end of the fixed part of the Y-shaped structure points to the first main body part. The free end of the fixed portion of the first annular wave support rod adjacent to the first main body portion in the middle part is axially spaced from the free end of the fixed portion of the first annular wave support rod adjacent to the second main body portion in the middle part.

5. The bracket according to claim 4, characterized in that, Each of the Y-shaped structures of the first annular wave-shaped support rod adjacent to the first main body in the middle part is staggered with each of the Y-shaped structures of the first annular wave-shaped support rod adjacent to the second main body in the middle part in the circumferential direction; the included angle between the centers of two adjacent Y-shaped structures is a fixed value.

6. The bracket according to claim 4, characterized in that, Each of the Y-shaped structures of the first annular wave support rod adjacent to the first main body in the middle part is arranged collinearly with each of the Y-shaped structures of the first annular wave support rod adjacent to the second main body in the middle part.

7. The bracket according to claim 5 or 6, characterized in that, Both the first annular wave-shaped support rod adjacent to the first main body and the first annular wave-shaped support rod adjacent to the second main body in the middle portion include two Y-shaped structures.

8. The bracket according to claim 1, characterized in that, The density of the Z-shaped waveform in the circumferential direction of the first annular waveform support rod is less than the density of the Z-shaped waveform in the circumferential direction of the second annular waveform support rod.

9. The bracket according to claim 1, characterized in that, A connection point is formed between the first annular waveform support rod and the second annular waveform support rod. The connection point is located at the point where the trough of the Z-shaped waveform of the first annular waveform support rod meets the peak of the Z-shaped waveform of the second annular waveform support rod, and at the point where the peak of the Z-shaped waveform of the first annular waveform support rod meets the trough of the Z-shaped waveform of the second annular waveform support rod.

10. The stent according to claim 1, characterized in that, The proximal portion includes two first annular wave support rods arranged in parallel along the axis, or the proximal portion includes two second annular wave support rods arranged in parallel along the axis; and / or the distal portion includes two first annular wave support rods arranged in parallel along the axis, or the distal portion includes two second annular wave support rods arranged in parallel along the axis.

11. The stent according to claim 10, characterized in that, The proximal portion includes two first annular wave-shaped support rods arranged axially side-by-side, and the first main body portion is connected to the proximal portion via second annular wave-shaped support rods; the proximal portion includes two second annular wave-shaped support rods arranged axially side-by-side, and the first main body portion is connected to the proximal portion via first annular wave-shaped support rods; the distal portion includes two first annular wave-shaped support rods arranged axially side-by-side, and the second main body portion is connected to the distal portion via second annular wave-shaped support rods; the distal portion includes two second annular wave-shaped support rods arranged axially side-by-side, and the second main body portion is connected to the distal portion via first annular wave-shaped support rods.

12. The bracket according to claim 11, characterized in that, The connection between the proximal portion and the first main body portion forms a tapered opening after the bracket is unfolded, and the angle between the generatrix of the tapered opening and the axis is 30 to 60 degrees. The connection between the distal portion and the second main body portion forms a tapered opening after the bracket is unfolded, and the angle between the generatrix of the tapered opening and the axis is 30 to 60 degrees.

13. The stent according to any one of claims 10 to 12, characterized in that, A fixing rod is arranged on the first annular waveform support rod or the second annular waveform support rod in the proximal portion away from the first main body portion or in the distal portion away from the second main body portion; in the distal portion, the fixing rod extends from the crest of the Z-shaped waveform of the first annular waveform support rod or the second annular waveform support rod. In the proximal portion, the fixing rod extends from the trough of the Z-shaped waveform of the first annular waveform support rod or the second annular waveform support rod; a plurality of fixing rods are evenly distributed circumferentially; and the fixing rods are provided with developing marks.

14. The stent according to claim 13, characterized in that, Both the proximal portion and the distal portion include four of the aforementioned fixing rods.

15. The stent according to claim 1 or 2, characterized in that, The developing mark is a radiopaque spring or a developing metal ring, and the developing mark is fixed to the bracket by laser welding or adhesive bonding.

16. The stent according to claim 13, characterized in that, The developing mark is a radiopaque spring or a developing metal ring, and the developing mark is fixed to the bracket by laser welding or adhesive bonding.

17. The bracket according to claim 1, characterized in that, The bracket is formed by laser cutting an alloy tube.

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