Hybrid Braided Stent

Abstract

The present invention belongs to the technical field of medical devices, and specifically relates to a hybrid braided stent. The hybrid braided stent includes a stent body, and the stent body is a single-layer structure. The stent body is a tubular structure formed by interlacing and weaving at least two filaments, and the end areas of at least two filaments are not exactly the same. The stent body of the hybrid braided stent of the present invention is formed by interlacing and weaving at least two filaments, and the end areas of at least two filaments are different. The filaments with larger end areas enable the stent body to have good supporting force, so as to fit closely with the blood vessels and achieve good positioning. The filaments with smaller end areas enable the mesh of the stent body to be smaller. After the stent body is installed in the blood vessel, the plaque is subjected to more uniform force and is not easy to break. Even if the plaque is broken, the stent body can effectively prevent the fragments of the plaque from flowing to the downstream of the blood vessel. In summary, compared with the prior art, the stent body of the present invention has better safety in use.

Description

Technical Field

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

[0002] Cerebrovascular disease is a major disease threatening human health today and is the third leading cause of death after cardiovascular disease and tumors. Among them, 25% of ischemic strokes are related to carotid artery stenosis or occlusion.

[0003] The treatment of carotid stenosis is mainly divided into drug therapy, carotid endarterectomy, and carotid stenting. Among them, carotid stenting has the advantages of simplicity, less trauma, and fewer complications, and is currently one of the effective methods for treating carotid stenosis. Carotid stents are generally installed in the common carotid artery and the internal carotid artery. After the carotid stent is opened, the blood vessels that have been narrowed due to the disease are expanded and the normal blood supply of the blood vessels is restored.

[0004] Currently, the common carotid stents include cutting stents and braided stents.

[0005] Cutting stents are usually cylindrical structures made of metal pipes cut by laser, and are mainly divided into open-loop and closed-loop structures. The mesh of the open-loop structure is relatively large and cannot effectively cover the plaque. When the stent is released at the stenosis of the carotid artery, the stent rod is likely to cut the plaque, causing the plaque to break and fall off. The broken plaque will flow into the brain with the blood flow and block the cerebral blood vessels, causing stroke or even death. The mesh of the closed-loop structure is relatively small and can effectively cover the plaque, but the stent has too much support and is difficult to pass through tortuous lesions.

[0006] A braided stent is a mesh stent woven from metal wires (usually nickel-titanium memory alloy wires). For example, a double-layer braided stent structure (US20160361180A1) is disclosed, which is divided into an outer braided stent and an inner metal mesh. The outer braided stent is woven with thicker metal wires, and the outer braided stent provides the main radial support force. However, the mesh of the outer braided stent is also relatively large, making it difficult to cover the plaque and not prevent the plaque from breaking and migrating. The mesh of the inner metal mesh is relatively small to effectively prevent the plaque from flowing to the downstream of the blood vessel. The double-layer braided stent structure solves the problem of fragments entering the downstream of the blood vessel after the plaque is broken. However, the outer braided stent and the inner metal mesh of the double-layer braided stent have different expansion and contraction rates. When released to the blood vessel at a predetermined position, it is difficult to accurately control the position accuracy of the outer braided stent and the inner metal mesh. It is easy for the inner metal mesh to not be able to fit tightly against the outer braided stent, resulting in the inner metal mesh being unable to effectively prevent the fragments from flowing to the downstream of the blood vessel.

[0007] In summary, the safety of existing carotid artery stents is poor. Summary of the invention

[0008] The purpose of the present invention is to provide a hybrid braided stent to solve the problem of poor safety of existing carotid artery stents.

[0009] To achieve this object, the present invention adopts the following technical solutions:

[0010] A hybrid braided stent comprises a stent body, wherein the stent body is a single-layer structure; the stent body is a tubular structure formed by interlacing and braiding at least two filaments, and the end areas of at least two of the filaments are not completely the same.

[0011] Preferably, in the above-mentioned hybrid braided stent, the stent body is cylindrical or conical, and the materials of at least two of the filaments are not completely the same.

[0012] Preferably, in the above-mentioned hybrid braided stent, the stent body is braided from two or more types of filaments with different end areas.

[0013] Preferably, in the above hybrid woven stent, at least one of the filaments has a developable property.

[0014] Preferably, in the above-mentioned hybrid braided stent, ends of at least two of the filaments located at the ends of the stent body are connected together to close the ends of the filaments.

[0015] Preferably, in the above-mentioned hybrid braided stent, the ends of every two filaments located at the end of the stent body are connected together through a sleeve, or the ends of every two filaments located at the end of the stent body are welded together to connect the ends of the two filaments into a closed curve.

[0016] Preferably, in the above-mentioned hybrid braided stent, the stent body has at least two sections, and the braiding angles of the sections are not completely the same.

[0017] Preferably, in the above hybrid woven stent, the hybrid woven stent further comprises an expansion frame, the expansion frame is installed at the end of the stent body, and the diameter of the expansion frame gradually increases in the direction away from the stent body.

[0018] Preferably, in the above-mentioned hybrid braided stent, a smooth insulating layer is provided on the surface of the filaments.

[0019] Preferably, in the above-mentioned hybrid braided stent, the filaments at the ends of the stent body are formed with bending portions, the bending portions enclose a socket, and the socket is used for plug-fitting with the protrusion of the conveying component.

[0020] The beneficial effect of the hybrid braided stent of the present invention is that the stent body is formed by interlacing and braiding at least two filaments, and the end areas of at least two filaments are different. The filaments with larger end areas make the stent body have good supporting force, so as to fit closely with the blood vessel and achieve good positioning. The filaments with smaller end areas make the mesh of the stent body smaller. After the stent body is installed in the blood vessel, the plaque is more evenly stressed and not easy to break. Even if the plaque is broken, the stent body can effectively prevent the fragments of the plaque from flowing to the downstream of the blood vessel.

[0021] In summary, compared with the prior art, the bracket body of the present invention is safer to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural diagram of a carotid artery according to an embodiment of the present invention;

[0023] Figure 2 It is a partial structural diagram of the first type of bracket body according to an embodiment of the present invention;

[0024] Figure 3 This is a structural diagram of a main frame woven with thick filaments according to an embodiment of the present invention;

[0025] Figure 4 This is an overall structural diagram of the first type of bracket body according to an embodiment of the present invention;

[0026] Figure 5 is a diagram showing the coordination between the stent body and the blood vessel according to an embodiment of the present invention;

[0027] Figure 6 This is a diagram of a first connection method of two filament ends according to an embodiment of the present invention;

[0028] Figure 7 This is a diagram of a second connection method of two filament ends according to an embodiment of the present invention;

[0029] Figure 8 is a structural diagram of the first bending portion of the filament according to an embodiment of the present invention;

[0030] Fig. 9 is a structural diagram of the second bending portion of the filament according to an embodiment of the present invention;

[0031] Fig.10 is a structural diagram of the third bending portion of the filament according to an embodiment of the present invention;

[0032] Fig.11 is a structural diagram of a second type of bracket body according to an embodiment of the present invention;

[0033] Fig.12 is a connection diagram of the bracket body and the expansion frame according to an embodiment of the present invention;

[0034] Fig.13is a diagram of the coordination of the hybrid braided stent and the delivery assembly according to an embodiment of the present invention;

[0035] Fig.14 It is a partial view of the cooperation between the hybrid braided stent and the delivery assembly according to an embodiment of the present invention;

[0036] Fig.15 is a stereogram of an anchoring body according to an embodiment of the present invention;

[0037] Fig.16 is a process diagram of installing a hybrid braided stent through a delivery assembly according to an embodiment of the present invention;

[0038] Fig.17 is a structural diagram of a third type of bracket body according to an embodiment of the present invention;

[0039] Fig.18 It is a simplified structural diagram of the fourth bracket body according to an embodiment of the present invention.

[0040] The names and numbers of the components in the figure are as follows:

[0041] Carotid artery 10, common carotid artery 11, internal carotid artery 12, external carotid artery 13, plaque 14, stent body 20, thin filament 21, thick filament 22, intermediate filament 23, proximal end 24, distal end 25, first bending portion 26, second bending portion 27, third bending portion 28, sleeve 30, expansion frame 40, reinforcement rod 41, welding point 50, delivery assembly 60, handle 61, catheter 62, core shaft 63, head body 64, anchor body 65, protrusion 651. DETAILED DESCRIPTION

[0042] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0043] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0045] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0046] Embodiment 1

[0047] Figure 1 Schematic diagram of the structure of the carotid artery 10 according to an embodiment of the present invention. Figure 1 As shown, the carotid artery 10 is divided into the common carotid artery 11, the internal carotid artery 12 and the external carotid artery 13, and the common carotid artery 11, the internal carotid artery 12 and the external carotid artery 13 form a Y-shaped bifurcation structure. The blood of the common carotid artery 11 flows into the internal carotid artery 12 and the external carotid artery 13 at the Y-shaped bifurcation structure. Among them, the blood of the internal carotid artery 12 mainly flows to the brain, and the blood of the external carotid artery 13 mainly supplies the facial organs. There are plaques 14 on the common carotid artery 11 and the internal carotid artery 12, and the plaques 14 cause the blood vessels to narrow and affect the circulation of blood. Therefore, it is necessary to install a stent at the lesion to expand the blood vessels and ensure the normal passage of blood.

[0048] Figure 2 FIG. 2 is a partial structural diagram of the first type of bracket body 20 according to an embodiment of the present invention. Figure 2 As shown, this embodiment discloses a hybrid braided stent, which includes a stent body 20, and the stent body 20 is a single-layer structure. The stent body 20 is a tubular structure formed by interlacing and braiding at least two filaments. For example, the stent body 20 can be a cylindrical structure, or Fig.17As shown, the stent body 20 can be a conical structure to adapt to the shape of the blood vessel. The end areas of at least two filaments are not exactly the same. Among them, when the stent body 20 is a conical structure, the diameter gradually decreases from the proximal end to the distal end. Since the diameters at different positions of the blood vessel are different, the conical structure can adapt to the changes in the diameter of the blood vessel. Compared with the cylindrical structure, after the conical structure is implanted in the blood vessel, it has a better fit with the blood vessel wall, and the stent body 20 is less likely to cause excessive expansion of the blood vessel, and thus less likely to damage the blood vessel.

[0049] The hybrid braided stent of this embodiment is mainly used in narrow blood vessels. For example, it can be applied to the narrow blood vessels at the Y-shaped bifurcation mentioned above. The hybrid braided stent is installed on the common carotid artery 11 and the internal carotid artery 12, and blood can enter the external carotid artery 13 through the mesh of the stent body 20, which will not cause ischemia of the external carotid artery 13.

[0050] Figure 5 FIG. 2 is a diagram showing the coordination between the stent body 20 and the blood vessel according to an embodiment of the present invention. Figure 5 As shown, the stent body 20 of the hybrid braided stent of the present invention is formed by interlacing and weaving at least two filaments, and the end areas of at least two filaments are different. The filaments with larger end areas make the stent body 20 have good supporting force, so as to fit closely with the blood vessel and achieve good positioning. The filaments with smaller end areas make the mesh of the stent body 20 smaller. After the stent body 20 is installed in the blood vessel, the plaque 14 is more evenly stressed and not easy to break. Even if the plaque 14 is broken, the stent body 20 can effectively prevent the fragments of the plaque 14 from flowing to the downstream of the blood vessel.

[0051] In summary, compared with the prior art, the bracket body 20 of the present invention is safer to use.

[0052] In addition, the expansion and contraction rates of various parts of the bracket body 20 of this embodiment are substantially the same, and can be compressed to a smaller volume, so as to facilitate accurate positioning of the bracket body 20 during installation.

[0053] like Figure 2 As shown, preferably, the stent body 20 is woven from two filaments with different end areas. The materials of the two filaments are not completely the same. In other embodiments, the materials of the two filaments can be the same. Specifically, the two filaments are thin filaments 21 and thick filaments 22, and the end area of ​​the thin filaments 21 is smaller than the end area of ​​the thick filaments 22. Figure 3 2 is a structural diagram of the main frame woven with thick filaments 22 according to an embodiment of the present invention. Figure 3As shown, the mesh of the main frame woven by the thick filaments 22 is relatively large, for example, the size of the mesh is 1mm-20mm, preferably 1mm-10mm. The mesh mentioned in this application can be circular, diamond-shaped, rectangular, etc. For non-circular meshes, the size of the mesh refers to the diameter of the inscribed circle of the mesh. The main frame is mainly used to provide support between the blood vessels.

[0054] like Figure 2 and Figure 3 As shown, the thin filaments 21 and the thick filaments 22 are mixed and woven together. The total number of the thin filaments 21 and the thick filaments 22 is at least greater than 18, the number of the thick filaments 22 is at least 6, and the number of the thin filaments 21 is at least 12. The thin filaments 21 and the thick filaments 22 are evenly distributed. The braided stent body 20 can also be shaped by heat treatment, for example, the heat treatment temperature is 400°C-600°C, and the time is 30s-20min. The braiding angle of the thin filaments 21 and the thick filaments 22 can be 90°-180°.

[0055] Preferably, the end face shape of the filament in this embodiment can be circular, in which case the diameter of the thin filament 21 is 0.01mm-0.5mm, preferably 0.01mm-0.2mm. The diameter of the thick filament 22 is 0.05mm-1.0mm, preferably 0.1mm-0.5mm. In other embodiments, the end face shape of the filament can also be rectangular, that is, the filament is a flat structure.

[0056] The presence of the filaments 21 makes the mesh of the entire stent body 20 smaller, which can prevent the fragments of the plaque 14 from flowing to the downstream of the blood vessel. For example, the mesh size of the stent body 20 can be 0.05mm-2mm, preferably 0.1mm-1mm.

[0057] The thin filaments 21 and the thick filaments 22 are both made of medical metal wires, and the medical metal materials include medical stainless steel, nickel-titanium memory alloy, cobalt-based alloy, titanium alloy, magnesium alloy, etc., preferably nickel-titanium memory alloy. After being released in the blood vessel, the stent body 20 can be opened to fit the blood vessel, expand the blood vessel, and be positioned at the installation position. The stent body 20 has good flexibility and can adapt to blood vessels of different diameters and shapes.

[0058] Figure 4 : is an overall structural diagram of the first bracket body 20 according to an embodiment of the present invention, such as Figure 4As shown, preferably, the ends of at least two filaments located at one end or both ends of the stent body 20 are connected together to close the ends of the filaments. The ends of two filaments of the same kind may be connected together, or the ends of two filaments of different kinds may be connected together. The two ends of the stent body 20 are respectively a proximal end 24 and a distal end 25, and the distal end 25 can be considered as: the end that first enters the blood vessel during installation. The ends of the filaments at the proximal end 24 and the distal end 25 are closed, so that the proximal end 24 and the distal end 25 are relatively smooth and not easy to damage the blood vessel. In addition, it can also improve the supporting force of the stent body 20 and the storage capacity during contraction.

[0059] Figure 6 This is a diagram of the first connection method of the ends of two filaments in an embodiment of the present invention. Figure 7 FIG. 2 is a second connection diagram of the ends of two filaments according to an embodiment of the present invention. Figure 6 As shown, the ends of each two filaments at the proximal end 24 and the distal end 25 are connected together by a sleeve 30, or, as shown in FIG. Figure 7 As shown, the ends of every two filaments of the proximal end 24 and the distal end 25 are welded together by laser to connect the ends of the two filaments into a closed curve. In other embodiments, the ends of every two filaments of the proximal end 24 and the distal end 25 can also be connected together by glue.

[0060] like Figure 6 As shown, the inner diameter of the sleeve 30 is 0.01mm-0.1mm larger than the diameter of the two filaments, the wall thickness of the sleeve 30 is 0.01mm-0.2mm, and the length is 0.5mm-5mm. The sleeve 30 can be made of nickel-titanium alloy, medical stainless steel, cobalt-based alloy, titanium alloy or magnesium alloy. Preferably, the sleeve 30 can also be made of developing materials such as platinum-iridium alloy, gold, tantalum, platinum, platinum-tungsten alloy, so that the sleeve 30 has developing properties, which can help position the stent body 20. The connection process is: the sleeve 30 is sleeved on the ends of the two filaments, and then the sleeve 30 is connected to the ends of the two filaments by glue, laser welding, etc., so as to eliminate the sharp wire heads of the filaments.

[0061] like Figure 7 As shown, the welding process is: placing the ends of two filaments side by side, and then using a laser to punch one or more welding points 50 at the ends of the two filaments to connect the ends of the two filaments together, thereby eliminating the sharp wire heads of the filaments.

[0062] In other embodiments, the ends of more than three filaments may be connected together at the same time to eliminate the sharp ends of the filaments. In short, after braiding, it is necessary to ensure that the stent body 20 does not form a sharp part to protect the blood vessel. The support force between the stent body 20 and the blood vessel should also be based on not damaging the blood vessel.

[0063] Fig.12 4 is a connection diagram of the bracket body 20 and the expansion bracket 40 according to an embodiment of the present invention. Fig.12 As shown, preferably, the hybrid braided stent also includes an expansion frame 40, which is installed at the end of the stent body 20, and the diameter of the expansion frame 40 gradually increases in the direction away from the stent body 20. The diameter of the expansion frame 40 is larger than the diameter of the stent body 20. When the hybrid braided stent is released in the blood vessel, the support force between the expansion frame 40 and the blood vessel is greater to improve the overall positioning effect of the hybrid braided stent. The expansion frame 40 also includes a reinforcing rod 41, which forms a triangular structure with the proximal end 24 or the distal end 25. The reinforcing rod 41 can increase the support force between the expansion frame 40 and the blood vessel, and can also store energy for the contracted expansion frame 40.

[0064] Preferably, at least one of the filaments has a developing property, so as to further improve the developing property of the hybrid braided stent, and improve the installation accuracy and convenience of the hybrid braided stent. The developing filament can be a platinum-iridium alloy wire, a gold wire, a tantalum wire, a platinum wire, a platinum-tungsten alloy wire, etc.

[0065] Preferably, a smooth insulating layer is provided on the surface of the filament to reduce the friction between adjacent multiple filaments during the weaving process. The smooth insulating layer can also increase the smoothness of the extension and contraction of the stent body 20. In addition, the smooth insulating layer makes the surface of the filament smooth, which can reduce the friction between the stent body 20 and the catheter 62, reduce the transportation resistance of the stent body 20, facilitate the pushing and releasing of the stent body 20, and the smooth insulating layer can prevent the formation of thrombus. The smooth insulating layer can be a coating of Parylene (polyparaxylene) or its derivatives.

[0066] Since the materials of the filaments are not exactly the same, there will be a potential difference between the filaments of different materials, resulting in electrochemical corrosion, leading to the release of metal ions, the reduction of the support force of the stent body 20, and even the breakage of the filaments. The smooth insulating layer provided in this embodiment can prevent the metal ions on the filaments from entering the blood, prevent electrochemical corrosion, and protect the filaments.

[0067] Fig.11 2 is a structural diagram of a second type of bracket body 20 according to an embodiment of the present invention. Fig.11As shown, preferably, the stent body 20 is woven from three filaments with different end areas. The materials of the three filaments are not exactly the same. In other embodiments, the materials of the three filaments can be the same. The three filaments with different end areas are thin filaments 21, thick filaments 22 and intermediate filaments 23. The end area of ​​the intermediate filament 23 is larger than the thin filament 21 and smaller than the thick filament 22. The intermediate filament 23 plays a role of transition adjustment, so that the stent body 20 has a suitable supporting force and mesh size. By changing the end area and material of the intermediate filament 23, the supporting force and mesh size of the stent body 20 can be adjusted. The diameter of the intermediate filament 23 can be 0.02mm-0.8mm, preferably 0.05mm-0.3mm.

[0068] Figure 8 2 is a structural diagram of the first bending portion 26 of the filament according to an embodiment of the present invention. Fig. 9 2 is a structural diagram of the second bending portion 27 of the filament according to an embodiment of the present invention. Fig.10 2 is a structural diagram of the third bending portion 28 of the filament according to an embodiment of the present invention. Figure 8-Figure 10 As shown, the first bending portion 26 is a spring-like structure, and the second bending portion 27 is an Ω-shaped structure. Although the Ω-shaped structure is partially open, it can also store energy. The third bending portion 28 is a closed annular structure. The filament at the end of the stent body 20 is formed with a first bending portion 26 or a second bending portion 27 or a third bending portion 28. The first bending portion 26, the second bending portion 27, and the third bending portion 28 have a socket, and the socket is used to be plugged and matched with the protrusion 651 of the conveying component 60. For the second bending portion 27 with an opening, when the stent body 20 is located in the catheter 62 of the conveying component 60, the second bending portion 27 is in a closed state, so as to reliably plug and match with the protrusion 651, and it is not easy to separate from the protrusion 651.

[0069] The first bending portion 26, the second bending portion 27, and the third bending portion 28 are used to prevent the stent body 20 from being plastically deformed when entering the catheter 62 of the delivery assembly 60. The first bending portion 26, the second bending portion 27, and the third bending portion 28 have the function of storing energy, and after the stent body 20 is extended from the catheter 62, the stent body 20 has a large opening force. The opening force is based on the premise of not damaging the blood vessel.

[0070] Fig.13 It is a diagram showing the coordination of the hybrid braided stent and the delivery assembly 60 according to an embodiment of the present invention. Fig.14 It is a partial view of the hybrid braided stent and the delivery assembly 60 according to an embodiment of the present invention. Fig.15 It is a stereoscopic view of the anchor body 65 according to the embodiment of the present invention. Fig.16 It is a process diagram of installing a hybrid braided stent by using a delivery assembly 60 according to an embodiment of the present invention.

[0071] like Figure 13-Figure 16As shown, the delivery assembly 60 is used to deliver the hybrid braided stent to a predetermined blood vessel position and to recover the hybrid braided stent. The delivery assembly 60 includes a handle 61, a catheter 62, a core shaft 63, a head body 64 and an anchor body 65. The handle 61 and the head body 64 are respectively mounted at the front and rear ends of the core shaft 63. The core shaft 63 is movably located in the catheter 62. The anchor body 65 is mounted at the middle and rear part of the core shaft 63, and the protrusion 651 on the anchor body 65 is used to be plugged and matched with the first bending portion 26 or the second bending portion 27 or the third bending portion 28 of the proximal end 24 of the stent body 20, so as to facilitate the stent body 20 to be pushed out of the catheter 62, and when it is found that the installation position is inaccurate, the hybrid braided stent can be recovered into the catheter 62 in time.

[0072] The stent body 20 and the expansion frame 40 can be sleeved on the core shaft 63 and compressed into the catheter 62. Push the handle 61 forward to release the hybrid braided stent. During the release process, the expansion frame 40 at the distal end 25 will first anchor with the blood vessel to prevent the hybrid braided stent from moving during the release process. Pull the handle 61 backward to retract the hybrid braided stent.

[0073] Embodiment 2

[0074] like Fig.18 As shown, the stent body 20 of this embodiment is substantially the same as the stent body 20 of the first embodiment. For example, the stent body 20 of this embodiment is also a tubular structure formed by interlacing and weaving at least two filaments, as in the first embodiment, and the end areas of at least two filaments are not completely the same. The materials of at least two filaments are also not completely the same. The stent body 20 is woven from two or three filaments with different end areas.

[0075] The difference between the stent body 20 of the present embodiment and the stent body 20 of the first embodiment is that the stent body 20 of the present embodiment has at least two sections, and the braiding angles of the sections are not completely the same, so as to better adapt to the changes of the blood vessels.

[0076] For example, the bracket body 20 of this embodiment has two sections. Fig.18 The braiding angle a of the middle left segment is larger, and the braiding angle a of the right segment is smaller. The segment with a larger braiding angle a is set at a location with a larger blood vessel diameter, and the segment with a smaller braiding angle a is set at a location with a smaller blood vessel diameter. Each segment can provide sufficient radial support force, and the segment with a smaller braiding angle a has a smaller chronic outward force than the segment with a larger braiding angle a, which can reduce damage to small-diameter blood vessels while dilating the blood vessels.

[0077] In the embodiment of the stent body 20 , when the diameters of the various sections are the same, different sections have different radial support forces and chronic outward forces, and thus the stent body 20 has better applicability.

[0078] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A hybrid braided stent, characterized in that: The stent body (20) comprises a single-layer structure; the stent body (20) is a tubular structure formed by interlacing and weaving at least two filaments, and the end areas of at least two of the filaments are not completely the same; The hybrid braided stent further comprises an expansion frame (40), wherein the expansion frame (40) is installed at the end of the stent body (20), and the diameter of the expansion frame (40) gradually increases in a direction away from the stent body (20); The filament at the end of the stent body (20) is formed with a bending portion, and the bending portion forms a socket, and the socket is used for plugging and matching with the protrusion (651) of the conveying component (60).

2. The hybrid braided stent according to claim 1, characterized in that: The stent body (20) is cylindrical or conical, and the materials of at least two of the filaments are not completely the same.

3. The hybrid braided stent according to claim 1, characterized in that: The stent body (20) is woven from two or more filaments having different end areas.

4. The hybrid braided stent according to claim 1, characterized in that: At least one of the filaments has a developing property.

5. The hybrid braided stent according to claim 1, characterized in that: The ends of at least two of the filaments located at the ends of the stent body (20) are connected together to close the ends of the filaments.

6. The hybrid braided stent according to claim 5, characterized in that: The ends of every two of the filaments at the end of the stent body (20) are connected together through a sleeve (30), or the ends of every two of the filaments at the end of the stent body (20) are welded together to connect the ends of the two filaments into a closed curve.

7. The hybrid braided stent according to claim 1, characterized in that: The support body (20) has at least two sections, and the braiding angles of the sections are not completely the same.

8. The hybrid braided stent according to claim 1, characterized in that: The surface of the filament is provided with a smooth insulating layer.

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