Woven stent, delivery system and stent system

Abstract

The invention provides a woven stent, a delivery system and a stent system.The woven stent is formed by weaving a plurality of weaving wires in a staggered mode, the end portions of all the weaving wires at at least one end of the woven stent are provided with preset structures, the preset structures are smooth structures, all the preset structures at at least one end of the woven stent are distributed on different circumferential faces, and the preset structures are smooth structures. The conveying system comprises a conveying guide wire, a plurality of friction pads are arranged at the far end of the conveying guide wire at intervals in the axial direction, and the woven stent is used for being loaded on the friction pads. The preset structure at the at least one end of the woven stent is used for being clamped and matched with the gap between the friction pads, so that the probability of stent deloading and withdrawing failure in the conveying process can be reduced, and scratching of the stent to the microcatheter and stimulation of the stent to the blood vessel wall can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a braided stent, a delivery system and a stent system. Background Art

[0002] Braided stents are widely used clinically, especially in blood flow guidance. Braided stents are woven from multiple strands of wire. During the weaving process, the braided wire at at least one end of the stent is cut off to form loose wire heads. The loose wire heads are easy to rub against the inner wall of the microcatheter during the stent delivery process, which will not only increase the pushing resistance during the delivery process, but also may generate debris. The debris enters the human body with the stent and is likely to cause embolic events. In addition, in tortuous blood vessels, if the braided stent is pushed repeatedly, the end of the braided stent is also prone to loosening, unable to fit tightly with the blood vessel wall, and easily causing stenosis in the stent. In addition, existing braided stents are also prone to unloading during delivery, and the risk of withdrawal failure is also high.

[0003] Therefore, for those skilled in the art, how to design a braided stent that can reduce end looseness and deformation, as well as the risk of unloading and withdrawal failure, is a technical problem that urgently needs to be solved.

[0004] It should be noted that the information disclosed in the background technology section of this application is only intended to deepen the understanding of the general background technology of this application, and should not be regarded as an admission or suggestion in any form that the information constitutes prior art already known to those skilled in the art. Summary of the invention

[0005] In view of the above technical problems, the object of the present invention is to provide a braided stent, a delivery system and a stent system to reduce the pushing resistance during the delivery process and reduce the probability of loosening and deformation of the stent end.

[0006] To achieve the above-mentioned purpose, the present invention provides a braided stent, which is formed by interweaving multiple braided wires, and the ends of all the braided wires at at least one end of the braided stent are provided with a predetermined structure, and the predetermined structure is a smooth structure. All the predetermined structures at at least one end of the braided stent are distributed on different circumferential surfaces, and the predetermined structures on different circumferential surfaces are staggered in the circumferential direction of the braided stent.

[0007] Optionally, the predetermined structures on different circumferential surfaces of the same end are spaced apart in the axial direction of the braided stent by 0.5 mm to 5.0 mm.

[0008] Optionally, all the predetermined structures at at least one end of the braided stent are distributed on two circumferential surfaces, or all the predetermined structures at at least one end of the braided stent are distributed on three circumferential surfaces.

[0009] Optionally, the ends of all the braided wires at the proximal end of the braided stent are provided with the predetermined structure, and all the braided wires form a closed loop at the distal end of the braided stent; or, the ends of all the braided wires at the distal end of the braided stent are provided with the predetermined structure, and all the braided wires form a closed loop at the proximal end of the braided stent; or, the ends of all the braided wires at both the proximal and distal ends of the braided stent are provided with the predetermined structure.

[0010] Optionally, the braided wires include first-direction braided wires and second-direction braided wires, the braided stent is formed by interlacing the first-direction braided wires and the second-direction braided wires, the predetermined structures of any adjacent multiple first-direction braided wires are distributed on different circumferential surfaces, and the predetermined structures of any adjacent multiple second-direction braided wires are distributed on different circumferential surfaces.

[0011] Optionally, the predetermined structure is spherical or quasi-spherical, and a radial dimension of the predetermined structure is greater than or equal to a radial dimension of the braided wire.

[0012] Optionally, the radial dimension of the predetermined structure does not exceed 1.5 times the radial dimension of the braided wire.

[0013] Optionally, the corresponding ends of the braided wires are processed by at least one of laser processing, glue dispensing processing, chemical corrosion, polishing processing and grinding to form the predetermined structure.

[0014] Based on the same inventive concept, the present invention also provides a delivery system for delivering any one of the braided stents, comprising a delivery guide wire, a plurality of friction pads are axially spaced apart at the distal end of the delivery guide wire, the braided stent is used to be loaded on the friction pads, and the predetermined structure at at least one end of the braided stent is used to engage with the gap between the friction pads.

[0015] Optionally, the gap between the multiple friction pads is 1 mm to 5 mm.

[0016] Based on the same inventive concept, the present invention further provides a stent system, which includes any one of the braided stents and any one of the delivery systems described.

[0017] Compared with the prior art, the braided stent, delivery system and stent system of the present invention have the following advantages:

[0018] In the above braided stent, the ends of all the braided wires at at least one end are provided with a predetermined structure, which is a smooth structure. This predetermined structure can prevent the ends of the stent from loosening and deforming, and can reduce the scratching of the ends of the stent on the microcatheter, thereby reducing the push resistance during transportation, and preventing the generation of debris, avoiding the problem of embolism, and the predetermined structure can also reduce the stimulation to the blood vessel wall and reduce the risk of restenosis in the stent. In particular, all the predetermined structures at the same end are distributed on different circumferential surfaces, and the predetermined structures on different circumferential surfaces are staggered in the circumferential direction. Such an arrangement can better reduce the radial size of the braided stent during compression and further reduce the push resistance. The predetermined structure can also engage with the friction pad on the delivery system to effectively reduce the probability of stent unloading and withdrawal failure during transportation, and improve the force transmission efficiency.

[0019] Since the stent system provided in the present application and the woven stent and delivery system provided in the present application belong to the same inventive concept, the stent system provided in the present application has all the advantages of the woven stent and delivery system provided in the present application. Therefore, the beneficial effects of the stent system provided in the present application will not be described one by one here. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Those skilled in the art will appreciate that the accompanying drawings are provided for a better understanding of the present invention and do not constitute any limitation on the scope of the present invention.

[0021] Figure 1 is a schematic structural diagram of a braided stent provided according to an embodiment of the present invention;

[0022] Figure 2 yes Figure 1 An enlarged view of a structure in which the ends of all braided wires at the proximal end of the braided stent are provided with a predetermined structure;

[0023] Figure 3 yes Figure 1 Schematic diagram of the proximal end of the braided stent;

[0024] Figure 4 is a schematic structural diagram of a braided stent provided according to another embodiment of the present invention;

[0025] Figure 5 yes Figure 4 An enlarged view of a structure in which the ends of all braided wires at the proximal end of the braided stent are provided with a predetermined structure;

[0026] Figure 6 yes Figure 4 Schematic diagram of the proximal end of the braided stent;

[0027] Figure 7 is a schematic structural diagram of a braided stent provided according to another embodiment of the present invention;

[0028] Figure 8 is a diagram of a delivery state when a delivery system provided according to an embodiment of the present invention delivers a braided stent having a predetermined structure at the proximal end;

[0029] Fig. 9 It is a diagram of the delivery state when a delivery system provided according to an embodiment of the present invention delivers a braided stent with predetermined structures at both the proximal and distal ends. DETAILED DESCRIPTION

[0030] The following is an explanation of the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the present embodiment only illustrate the basic concept of the present invention in a schematic manner, and only the components related to the present invention are shown in the figure instead of being drawn according to the number, shape and size of the components in the actual implementation. The type, quantity and proportion of each component in the actual implementation can be a random change, and the component layout type may also be more complicated.

[0031] In order to make the purpose, advantages and features of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings. It should be noted that the drawings are all in very simplified form and in non-precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. The same or similar reference numerals in the drawings represent the same or similar components.

[0032] The "proximal end" mentioned in this application document refers to the end that is closer to the surgical operator when in use, and the "distal end" refers to the end that is farther from the surgical operator when in use; the "axial" generally refers to the length direction of the braided stent during transportation, that is, the direction along the central axis of the braided stent itself, the "radial" generally refers to the direction of the braided stent perpendicular to its axial direction, the "circumferential" generally refers to the axial direction around the braided stent, and the "radial dimension" refers to the diameter or cross-sectional area.

[0033] The purpose of the present invention is to provide a braided stent, a delivery system and a stent system to solve the problems of the existing braided stents being easily loose and deformed at the ends, and being easily unloaded and failing to withdraw during delivery. However, it should be understood that the braided stent provided by the present invention can be used to treat a variety of medical conditions, including but not limited to blood flow guidance when isolating aneurysms. Although the braided stent may be particularly helpful in treating aneurysms, this embodiment should not be limited to such treatment.

[0034] The present invention is described in detail below with reference to the accompanying drawings and preferred embodiments.

[0035] like Figures 1 to 9 As shown, the embodiment of the present invention relates to a braided stent 100, which is a mesh structure and is formed by interlacing and weaving a plurality of braided wires 101. The braided stent 100 has a proximal end 102 and a distal end 104 that are arranged opposite to each other along its own axial direction, and the ends of all the braided wires 101 at at least one end of the proximal end 102 and the distal end 104 are provided with a predetermined structure 105, and the predetermined structure 105 is a smooth structure.

[0036] After the predetermined structure 105 is set, it can prevent the stent end from loosening and deforming, thereby reducing the scraping of the braided stent 100 against the inner wall of the microcatheter, thereby reducing the push resistance during the delivery process, and preventing the generation of debris and avoiding embolism. After the braided stent 100 is implanted, the predetermined structure 105 can also reduce the stimulation to the blood vessel wall and reduce the probability of restenosis after the stent is implanted. In addition, the predetermined structure 105 is also used to communicate with the delivery system 200 (see Figure 8 and Fig. 9 ) are engaged to reduce the probability of unloading and failure of withdrawal of the braided stent 100 during transportation, thereby improving the efficiency of force transmission. It is also relatively easy to realize the predetermined structure 105 in terms of technology, which is convenient for mass production of the braided stent 100. Moreover, because the predetermined structure 105 is not used for hot melting or welding the two braided wires 101, there is no problem of fatigue fracture due to large strain at the welding or hot melting position during crimping, so it does not affect the performance of the braided stent 100.

[0037] Specifically, each braided wire 101 has two opposite ends, both ends of the braided wire 101 are located at the proximal end 102 of the braided stent 100, or both ends of the braided wire 101 are located at the distal end 104 of the braided stent 100, or one of the two ends of the braided wire 101 is located at the proximal end 102 of the braided stent 100, and the other is located at the distal end 104 of the braided stent 100. It should be understood that the two ends of the braided wire 101 are the two free ends of the braided wire 101.

[0038] refer to Figures 1 to 3In one embodiment, the ends of all braided wires 101 at the proximal end 102 of the braided stent 100 are provided with a predetermined structure 105, that is, both ends of all braided wires 101 are located at the proximal end 102 of the braided stent 100, and all braided wires 101 form a closed loop 103 at the distal end 104 of the braided stent 100, and the closed loop 103 is an arc-shaped structure formed by bending the middle part of the braided wire 101. The number of closed loops 103 is 1 / 2 of the number of braiding heads of the braided stent 100. At the distal end 104 of the braided stent 100, a plurality of closed loops 103 are distributed along the circumference of the braided stent 100, and the lengths of these closed loops 103 may be the same or different. Optionally, the lengths of the plurality of closed loops 103 are different to form closed loops 103 of different lengths, and the closed loops 103 of different lengths are arranged at intervals in the circumferential direction, which is conducive to reducing the compression size of the predetermined structure 105 of the braided stent 100 in the microcatheter during transportation and reducing the push resistance.

[0039] Continue to refer to Figures 1 to 3 At the proximal end 102 of the braided stent 100, the ends of both ends of all the braided wires 101 are provided with a predetermined structure 105, and the radial dimension (such as diameter or cross-sectional area) of the predetermined structure 105 is greater than or equal to the radial dimension (such as diameter or cross-sectional area) of the braided wire 101. Preferably, the radial dimension of the predetermined structure 105 does not exceed 1.5 times the radial dimension (such as wire diameter) of the braided wire 101, thereby having little effect on the compressed dimension of the braided stent 100 and avoiding increasing the size of the delivery system 200.

[0040] The predetermined structure 105 is mainly a spherical or quasi-spherical structure. The quasi-spherical structure can be understood as not being a sphere in the strict sense, such as an elliptical, oblate spherical or other quasi-spherical structure. In practice, the predetermined structure 105 can have any suitable shape, as long as the outer surface of the predetermined structure 105 is round and smooth, does not scratch the inner wall of the catheter and the inner wall of the blood vessel, and can be engaged with the delivery system. The predetermined structure 105 can be prepared and formed by at least one processing method. The following is an exemplary description.

[0041] In one embodiment, after laser treatment, a spherical or quasi-spherical predetermined structure 105 is formed at the end of the corresponding braided wire 101. During laser treatment, the spherical or quasi-spherical predetermined structure 105 can be directly welded at the end of the braided wire 101 to form the spherical or quasi-spherical predetermined structure 105.

[0042] In one embodiment, after glue dispensing, a spherical or quasi-spherical predetermined structure 105 is formed at the end of the corresponding braided wire 101. During glue dispensing, glue is directly applied to the end of the braided wire 101 to wrap the end to form a spherical or quasi-spherical predetermined structure 105.

[0043] In another embodiment, a spherical or quasi-spherical predetermined structure 105 is formed at the end of the corresponding braided wire 101 through chemical etching, polishing or grinding.

[0044] In practice, at least one of the above processing methods may be selected to process the end of the corresponding braided wire 101 to form a predetermined structure 105 .

[0045] It should also be noted that all the predetermined structures 105 at at least one end of the braided stent 100 need to be distributed on different circumferential surfaces, and the predetermined structures 105 on different circumferential surfaces of the same end are staggered in the circumferential direction of the braided stent 100. Here, "staggered in the circumferential direction" can be understood as that when the predetermined structure 105 on one circumferential surface is moved along the axial direction of the braided stent 100 toward the predetermined structure 105 on another circumferential surface, there is no situation where one predetermined structure 105 overlaps with another predetermined structure 105. In this way, the radial size of the predetermined structure 105 of the braided stent 100 during compression can be reduced, and the probability of the braided stent 100 failing to be pressed into the sheath is reduced, thereby further reducing the push resistance.

[0046] like Figures 1 to 3 As shown, in one embodiment, all predetermined structures 105 at the proximal end 102 of the braided stent 100 are distributed on two circumferential surfaces T1 and T2, and the predetermined structures 105 on the two circumferential surfaces T1 and T2 are staggered in the circumferential direction of the braided stent 100. "Staggered distribution" means that the positions of the predetermined structures 105 on different circumferential surfaces T1 and T2 in the circumferential direction do not correspond (i.e., do not overlap). Figure 3 For example, it should be understood that all braided wires 101 include first-direction braided wires and second-direction braided wires, and the braided stent 100 is formed by interlacing the first-direction braided wires and the second-direction braided wires, and the predetermined structures 105 of any two adjacent first-direction braided wires are distributed on two circumferential surfaces T1 and T2, and the circumferential positions do not overlap. Similarly, the predetermined structures 105 of any two adjacent second-direction braided wires are distributed on two circumferential surfaces T1 and T2, and the circumferential positions do not overlap. The first direction and the second direction are two interlaced directions.

[0047] refer to Figures 4 to 6 In another embodiment, all predetermined structures 105 at the proximal end 102 of the braided stent 100 are distributed on three circumferential surfaces T1, T2 and T3, and the predetermined structures 105 on the three circumferential surfaces T1 and T2 are staggered in the circumferential direction of the braided stent 100 without overlapping each other. Figure 6It should also be understood that the predetermined structure 105 of any three adjacent first-direction braided wires are respectively arranged on the circumferential surfaces T1, T2 and T3, and the circumferential positions do not overlap, and at the same time, the predetermined structure 105 of any three adjacent second-direction braided wires are respectively arranged on the circumferential surfaces T1, T2 and T3, and the circumferential positions do not overlap.

[0048] Therefore, the predetermined structure 105 at the proximal end 102 of the braided stent 100 can be distributed on multiple circumferential surfaces, such as on two or three circumferential surfaces. In this way, while reducing the radial dimension, the shape integrity of the proximal end 102 of the braided stent 100 can also be ensured, and to a certain extent, the braided wire 101 can be prevented from spreading, thereby ensuring the mechanical properties of the braided stent 100.

[0049] However, in another embodiment, the ends of all braided wires 101 at the distal end 104 of the braided stent 100 are provided with a predetermined structure 105, that is, both ends of all braided wires 101 are located at the distal end 104 of the braided stent 100, and all braided wires 101 form a closed loop 103 at the proximal end 102 of the braided stent 100. In this solution, all predetermined structures 105 at the distal end 104 are distributed on at least two circumferential surfaces. Since the setting mode of the predetermined structure 105 at the distal end 104 is substantially the same as the setting mode of the predetermined structure 105 at the proximal end 102, the setting mode of the predetermined structure 105 at the distal end 104 will not be described in detail.

[0050] Reference Figure 7 In another embodiment, the ends of all braided wires 101 at the proximal end 102 and the distal end 104 of the braided stent 100 are provided with a predetermined structure 105, that is, one end of all braided wires 101 is located at the proximal end 102 of the braided stent 100, and the other end of all braided wires 101 is located at the distal end 104 of the braided stent 100. Similarly, all predetermined structures 105 at the proximal end 102 of the braided stent 100 are distributed on different circumferential surfaces and staggered in the circumferential direction, and / or, all predetermined structures 105 at the distal end 104 of the braided stent 100 are also distributed on different circumferential surfaces and staggered in the circumferential direction. The number of circumferential surfaces on which the predetermined structures 105 at the proximal end 102 are distributed is the same as or different from the number of circumferential surfaces on which the predetermined structures 105 at the distal end 104 are distributed. This braided stent 100 with predetermined structures 105 at both ends is particularly suitable for cobalt-chromium alloy stents, effectively reducing the risk of looseness and deformation of the ends of the cobalt-chromium alloy stents.

[0051] Preferably, the predetermined structures 105 on different circumferential surfaces at the same end of the braided stent 100 are spaced 0.5 mm to 5.0 mm in the axial direction of the braided stent 100. In this way, the shape of the proximal end 102 and / or the distal end 104 provided with the predetermined structures 105 is ensured to be intact, thereby ensuring the mechanical properties of the braided stent 100.

[0052] The present application does not limit the material of the braided wire 101, such as metal materials, polymer materials, degradable materials or non-degradable materials, which can be set according to actual needs. Optionally, at least part of the braided wire 101 can be developed under X-ray irradiation. For example, at least part of the braided wire 101 is a DFT metal wire, and the DFT metal wire includes a developable core wire and a sleeve coated on the outside of the developable core wire. The material of the developable core wire includes but is not limited to platinum, iridium, gold, silver, tantalum and tungsten or one or its alloy, and the material of the sleeve includes but is not limited to nickel-titanium alloy, nitinol, stainless steel, cobalt-chromium alloy, nickel-cobalt alloy or one or more combinations. Optionally, the cross-sectional area of ​​the developable core wire in the DFT metal wire accounts for 10% to 30% of the total cross-sectional area of ​​the DFT metal wire. When the braided stent 100 uses a developable braided wire 101, the X-ray developability of the braided stent 100 can be better, thereby improving the safety and accuracy of surgical operations. However, the method of achieving the developability of the braided stent 100 is not limited to the DFT metal wire. For example, in other embodiments, a developer may be coated on the braided wire 101 or the outer surface of the braided stent 100 for development, or a development point may be set. This application does not limit this.

[0053] To achieve good anchoring, the proximal end 102 and the distal end 104 of the braided stent 100 are both set to be bell-shaped. The bell-shaped mouth is conducive to better anchoring of the braided stent 10 with the blood vessel wall, reducing the probability of displacement of the braided stent 10. At the same time, the bell-shaped mouth can also ensure that the curved part in the blood vessel is fully attached to the wall.

[0054] Next reference Figure 8 and Fig. 9 , further illustrating the delivery process of the woven stent 100 according to an embodiment of the present invention.

[0055] like Figure 8 and Fig. 9 As shown, the embodiment of the present invention further provides a delivery system 200 for delivering the braided stent 100 of the embodiment of the present invention. The delivery system 200 includes a delivery guide wire 210, and a plurality of friction pads 220, such as 2 to 3 friction pads 220, are arranged at intervals along the axial direction at the distal end of the delivery guide wire 210. The friction pads 220 include but are not limited to silicone pads. Gaps are formed between the plurality of friction pads 220. Preferably, the gaps between the friction pads 220 are 1 mm to 5 mm. In actual use, the braided stent 100 is loaded on the friction pads 220 to deliver the braided stent 100 by friction.

[0056] The delivery system 200 further includes a sheath tube 230. During delivery, the braided stent 100 is compressed and installed in the sheath tube 230, and is installed at the distal end of the delivery guide wire 210 corresponding to the position of the friction pad 220. The delivery guide wire 210 can be movably inserted into the sheath tube 230, and can push the braided stent 100 along the axial direction of the sheath tube 230, thereby controlling the release and withdrawal of the braided stent 100.

[0057] The predetermined structure 105 at at least one end of the braided stent 100 according to the embodiment of the present invention can be engaged with the gap between the friction pads 220 .

[0058] like Figure 8 As shown, in one embodiment, a predetermined structure 105 is provided at the end of all braided wires 101 at the proximal end 102 of the braided stent 100, and all braided wires 101 form a closed loop 103 at the distal end 104 of the braided stent 100. At this time, the braided stent 100 is loaded on the distal end of the delivery guide wire 210, and according to the difference in the specifications of the stent, the delivery guide wire 210 is provided with two friction pads 220, and a gap is provided between the two friction pads 220. In actual use, it is only necessary to press the predetermined structure 105 at the proximal end 102 of the braided stent 100 into the gap between the friction pads 220, and the engagement and cooperation between the gap and the predetermined structure 105 can be utilized to assist in the delivery of the braided stent 100. This delivery method can improve the efficiency of force transmission and reduce the incidence of stent unloading and withdrawal failure.

[0059] like Fig. 9 As shown, in another embodiment, the ends of all braided wires 101 at the proximal end 102 and the distal end 104 of the braided stent 100 are provided with a predetermined structure 105. At this time, the predetermined structures 105 at the proximal end 102 and the distal end 104 of the braided stent 100 are pressed into the gap between the friction pads 220. This delivery method can evenly distribute the pushing force to the proximal end 102 and the distal end 104 of the braided stent 100, thereby better improving the delivery performance.

[0060] like Figure 8 and Fig. 9 As shown, the predetermined structures 105 on different circumferential surfaces can be pressed into the gaps between different friction pads 220 to form multiple positions in the axial direction, which has a good positioning effect and is less likely to be unloaded.

[0061] Based on the same inventive concept, an embodiment of the present invention further provides a stent system, which includes a delivery system 200 according to an embodiment of the present invention and a braided stent 100 according to an embodiment of the present invention.

[0062] Since the stent system provided by the present invention belongs to the same inventive concept as the woven stent 100 and the delivery system 200 provided by the present invention, the stent system provided by the present invention has all the advantages of the woven stent 100 and the delivery system 200 provided by the present invention, and the beneficial effects of the stent system provided by the present application will not be described one by one here.

[0063] Compared with the prior art, the ends of all the braided wires at at least one end of the braided stent of the present invention are provided with a predetermined structure of a smooth structure. This predetermined structure can prevent the ends of the stent from loosening and deforming, thereby reducing the scratching of the ends of the stent on the microcatheter, thereby reducing the push resistance during transportation, and preventing the generation of debris, thereby avoiding the problem of embolism. The predetermined structure can also reduce the stimulation to the blood vessel wall and reduce the risk of restenosis in the stent. In particular, all the predetermined structures at the same end are distributed on different circumferential surfaces, and the predetermined structures on different circumferential surfaces are staggered in the circumferential direction, which can better reduce the radial size of the braided stent during compression and further reduce the push resistance. The predetermined structure can also engage with the friction pad on the delivery system, effectively reducing the probability of stent unloading and withdrawal failure during transportation, and improving the force transmission efficiency.

[0064] The above description is only a description of the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any changes or modifications made by a person skilled in the art in the field of the present invention based on the above disclosure shall fall within the scope of protection of the technical solution of the present invention.

Claims

1. A braided stent, which is formed by interlacing a plurality of braided wires, characterized in that: The ends of all the braided wires at at least one end of the braided stent are provided with a predetermined structure, and the predetermined structure is a smooth structure. All the predetermined structures at at least one end of the braided stent are distributed on different circumferential surfaces, and the predetermined structures on different circumferential surfaces are staggered in the circumferential direction of the braided stent.

2. The braided stent according to claim 1, characterized in that: The spacing between the predetermined structures on different circumferential surfaces of the same end in the axial direction of the braided stent is 0.5 mm to 5.0 mm.

3. The braided stent according to claim 1, characterized in that: All the predetermined structures at at least one end of the braided stent are distributed on two circumferential surfaces, or all the predetermined structures at at least one end of the braided stent are distributed on three circumferential surfaces.

4. The braided stent according to claim 1, characterized in that: The ends of all the braided wires at the proximal end of the braided stent are provided with the predetermined structure, and all the braided wires form a closed loop at the distal end of the braided stent, or the ends of all the braided wires at the distal end of the braided stent are provided with the predetermined structure, and all the braided wires form a closed loop at the proximal end of the braided stent, or the ends of all the braided wires at the proximal and distal ends of the braided stent are provided with the predetermined structure.

5. The braided stent according to claim 1, characterized in that: The multiple braided wires include first-direction braided wires and second-direction braided wires, and the braided bracket is formed by interlacing the first-direction braided wires and the second-direction braided wires. The predetermined structures of any adjacent multiple first-direction braided wires are distributed on different circumferential surfaces, and the predetermined structures of any adjacent multiple second-direction braided wires are distributed on different circumferential surfaces.

6. The braided stent according to claim 1, characterized in that: The predetermined structure is spherical or quasi-spherical, and the radial dimension of the predetermined structure is greater than or equal to the radial dimension of the braided wire.

7. The braided stent according to claim 6, characterized in that: The radial dimension of the predetermined structure does not exceed 1.5 times the radial dimension of the braided wire.

8. The braided stent according to claim 1, characterized in that: The corresponding ends of the braided wires are processed by at least one of laser processing, glue dispensing processing, chemical corrosion, polishing processing and grinding processing to form the predetermined structure.

9. A delivery system for delivering the braided stent according to any one of claims 1 to 8, characterized in that: It comprises a delivery guide wire, a plurality of friction pads are arranged at intervals along the axial direction at the distal end of the delivery guide wire, the braided stent is used to be loaded on the friction pads, and the predetermined structure at at least one end of the braided stent is used to engage with the gap between the friction pads.

10. The conveying system according to claim 9, characterized in that The gaps between the friction pads are 1 mm to 5 mm.

11. A support system, characterized in that: It comprises the braided stent according to any one of claims 1 to 8 and the delivery system according to claim 9 or 10.

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