Intravascular stent and stent system

Abstract

The utility model provides an intravascular stent and stent system.The intravascular stent comprises a plurality of supporting pieces and a plurality of connecting pieces, and the supporting pieces and the connecting pieces are each of an annular waveform structure; the multiple supporting pieces are arranged at intervals in the axial direction of the intravascular stent, and the connecting pieces are connected and fixed to every two axially-adjacent supporting pieces. The wire diameter and / or rigidity of the connecting piece is smaller than that of the supporting piece; and each column of positioning ribs comprises at least one keel, and the two ends, in the length direction, of the keel are fixed to the two supporting pieces correspondingly. The intravascular stent has the advantages that the radial supporting force of the intravascular stent is guaranteed, the flexibility of the intravascular stent is improved, the intravascular stent has small elongation before and after being released, shortening of the intravascular stent is reduced, positioning is easier, and the positioning precision of the intravascular stent is improved.

Description

[0001] This application is based on the application with CN application number 2023214330073 and application date 2023-6-6, and claims its priority. The disclosed content of the CN application is hereby introduced into this application as a whole. Technical Field

[0002] The present application relates to the field of medical devices, and in particular to a vascular stent and a stent system. Background Art

[0003] Endovascular treatment is one of the main ways to treat peripheral vascular diseases, including EVAR (endovascular aneurysm repair, EVAR) or TEVAR (thoracic endovascular aortic repair, TEVAR). Endovascular treatment refers to the use of corresponding interventional devices to radially compress the stent graft and then deliver it to the location of the vascular lesion and then release it to restore the stent graft to a predetermined shape. The implanted stent graft can support the diseased vascular segment, allowing blood to flow through the stent graft to restore the correct flow direction of the blood vessel, maintain smooth blood flow in the vascular lumen, and thus achieve a therapeutic effect.

[0004] For Stanford type B aortic dissection, the intimal rupture is located below the isthmus of the aorta and extends to the descending aorta or the abdominal aorta. Surgical reconstruction is usually performed with proximal aortic repair as the main approach, which can only close the proximal tear. Usually, complete thrombosis of the false lumen can only be observed near the proximal covered stent, while part of the false lumen in the thoracic aorta or abdominal aorta still fails to thrombose.

[0005] Endovascular treatment provides a PETTICOAT technology to solve the problem of partial false lumen in the thoracic or abdominal aorta that has not been thrombosed. That is, on the basis of the proximal covered stent, a long bare metal stent is connected to the distal end of the covered stent. The radial support force of the bare metal stent can expand the true lumen, compress the false lumen, reduce the risk of further tearing of the distal rupture, and ultimately improve aortic remodeling, thereby promoting thrombusation of the distal false lumen of the thoracic and abdominal aorta and achieving a good true lumen remodeling effect. However, it may be difficult to position the long bare metal stent because it is not covered by a film. Utility Model Content

[0006] In order to better improve the positioning accuracy of a bare metal stent, the present application provides a vascular stent and a stent system.

[0007] The present application provides a vascular stent, which includes a plurality of support members, wherein the support members are annular wave-shaped structures;

[0008] A plurality of connecting pieces, each of which is a ring-shaped wave-shaped structure;

[0009] The plurality of support members are arranged at intervals along the axial direction of the vascular stent, and the connecting member is connected and fixed to two axially adjacent support members, so that the vascular stent forms a proximal opening, a distal opening and an axially extending inner cavity; the wire diameter and / or rigidity of the connecting member is smaller than that of the support member;

[0010] At least one row of positioning ribs, each row of positioning ribs includes at least one keel, and the two ends of the keel in the length direction are respectively fixed to the two support members; the support members where the two ends of the keel in the length direction are located are adjacent along the axial direction of the vascular stent, or there is at least one support member between the two ends of the keel in the length direction.

[0011] The present application has at least one of the following beneficial effects: the arrangement of the support members and the connecting members is conducive to ensuring the radial supporting force of the vascular stent, and is also conducive to improving the flexibility of the vascular stent. The vascular stent has a smaller elongation before and after release, is easier to position, and improves the positioning accuracy of the vascular stent; the arrangement of the keel is conducive to reducing the shortening of the vascular stent, thereby helping to improve the positioning accuracy of the vascular stent. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a structural schematic diagram of the support system;

[0013] Figure 2 is a schematic diagram of an exemplary structure of a vascular stent;

[0014] Figure 3 for Figure 2 A planar unfolded view of the vascular stent shown;

[0015] Figure 4 for Figure 2 A plan view of another possible embodiment of the vascular stent (with the keel omitted);

[0016] Figure 5 Schematic diagram of an exemplary scenario in which a stent system is used to reconstruct the thoracic aorta and the abdominal aorta.

[0017] Explanation of the accompanying drawings: 10, vascular stent; 11, support member; 111, support rod; 112, support crest; 113, support trough; 114, first crest; 115, second crest; 12, connector; 121, connecting section; 122, first connecting portion; 123, second connecting portion; 13, grid unit; 14, keel; 20, covered stent; 201, covered membrane; 202, supporting skeleton; 30, brachiocephalic artery; 40, left common carotid artery; 50, left clavicular artery; 60, left renal artery; 70, right renal artery; 80, mesenteric artery; 90, celiac trunk; 100, aneurysm cavity; 101, true cavity; 102, false cavity; 103, proximal rupture; 104, distal rupture. DETAILED DESCRIPTION

[0018] The technical solution of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0019] It should be noted in advance that, for the field of interventional medical devices, the proximal end refers to the end of the stent that is close to the heart after the stent is used for interventional treatment, and the distal end refers to the end of the stent that is away from the heart after the stent is used for interventional treatment. The direction of the central axis of rotation of objects such as cylinders and tubes is axial, and the direction perpendicular to the axial direction is radial. The circumferential direction refers to the "circumferential direction", that is, the direction around the axis of the cylinder, tube, etc. (perpendicular to the axis and perpendicular to the cross-sectional radius). "Circumferential", "axial" and "radial" together constitute the three orthogonal directions of the cylindrical coordinates. The circumferential length refers to the extension length of the structure or element along the circumferential direction of the cylinder, tube, etc. The axial length refers to the extension length of the structure or element along the axial direction of the cylinder, tube, etc. In order to distinguish it from the axial length of the support rod itself, the length it occupies in the axial direction of the main stent is referred to as the length along the axial direction of the main stent. This description is only for the convenience of expression and does not constitute a limitation on this application.

[0020] In order to better improve the positioning accuracy of bare metal stents, the present application provides a vascular stent and a stent system, which can be applied to a blood vessel for intracavitary treatment. It can be understood that the blood vessel can be an aortic arch, a thoracic aorta or an abdominal aorta, etc. A person of ordinary skill in the art should know that the use of a blood vessel for illustration is only used as an example and is not a limitation of the present application. The scheme of the present application is applicable to various human or animal cavities, such as the digestive tract, etc.

[0021] See also Figure 1 , Figure 1 It is a structural schematic diagram of the support system of the first embodiment of the present application.

[0022] The first embodiment of the present application provides a stent system, which includes a vascular stent 10 and a coated stent 20, wherein the vascular stent 10 is connected to the distal end of the coated stent 20. The distal end of the coated stent 20 and the proximal end of the vascular stent 10 may have an axial overlapping length. The distal end of the coated stent 20 is located in the inner cavity of the vascular stent 10; or the distal end of the coated stent 20 is located outside the vascular stent 10, in other words, the proximal end of the vascular stent 10 is located in the inner cavity of the coated stent 20.

[0023] In some other embodiments, the vascular stent 10 is connected to the proximal end of the stent graft 20, and the distal end of the stent graft 20 and the proximal end of the vascular stent 10 may have an axial overlap length. The distal end of the vascular stent 10 is located in the inner cavity of the stent graft 20; or the distal end of the vascular stent 10 is located outside the stent graft 20, in other words, the proximal end of the stent graft 20 is located in the inner cavity of the vascular stent 10.

[0024] The stent graft 20 includes a proximal opening, a distal opening, and an axially extending inner cavity, and the stent graft 20 is a self-expanding stent. The stent graft 20 includes a coating 201 and a support frame 202 fixed to the coating 201. The support frame 202 can be one or more of a braided stent, a corrugated ring frame, and a cutting stent, which are not limited here.

[0025] See also Figure 2 and Figure 3 , Figure 2 is a schematic diagram of an exemplary structure of a vascular stent 10, Figure 3 for Figure 2 The planar development diagram of the vascular stent 10 is shown. The vascular stent 10 comprises a proximal opening, a distal opening and an axially extending inner cavity. The vascular stent 10 is a self-expanding stent and is not covered by a film 201 .

[0026] The vascular stent 10 includes a plurality of support members 11 and a plurality of connectors 12. Both the support members 11 and the connectors 12 are annular wavy structures. The plurality of support members 11 are arranged at intervals along the axial direction of the vascular stent 10. The connector 12 is connected and fixed to two axially adjacent support members 11, so that the vascular stent 10 forms a proximal opening, a distal opening and an axially extending inner cavity.

[0027] The support member 11 is a closed-loop wave-shaped structure, and the support member 11 includes a plurality of support rods 111 connected in sequence at an angle. The two adjacent angles in the circumferential direction are the support crest 112 and the support trough 113, respectively, and the support crest 112 and the support trough 113 are arranged alternately along the circumference of the support member 11. The support crest 112 is closer to the proximal end of the vascular stent 10 than the support trough 113. In two axially adjacent support members 11, the support crest 112 of the support member 11 near the proximal end and the support trough 113 of the support member 11 near the distal end are opposite in the axial direction, or the support crest 112 of the support member 11 near the proximal end and the support crest 112 of the support member 11 near the distal end are opposite in the axial direction.

[0028] The connector 12 is a closed-loop wave-shaped structure, and includes a plurality of connecting segments 121 connected at an angle, and the plurality of connecting segments 121 are connected in sequence at an angle. Two adjacent angles in the circumferential direction are respectively a first connecting portion 122 and a second connecting portion 123, and the first connecting portion 122 and the second connecting portion 123 are arranged alternately along the circumference of the connector 12. The first connecting portion 122 is closer to the proximal end of the vascular stent 10 than the second connecting portion 123.

[0029] It is understood that the included angle may be a chamfer, that is, the included angle may be arc-shaped, acute or obtuse.

[0030] In two axially adjacent support members 11, the first connection portion 122 of the connector 12 is fixed to the support trough 113 of the support member 11 near the proximal end by one or more methods of winding, knotting, welding, hot pressing, bonding, mechanical fixation (such as steel sleeve) and suture suturing, and the second connection portion 123 of the connector 12 is fixed to the support crest 112 of the support member 11 near the distal end by one or more methods of winding, knotting, welding, hot pressing, bonding, mechanical fixation (such as steel sleeve) and suture suturing. The angle arrangement position between the support member 11 and the connector 12 allows the vascular stent 10 to form a grid structure with grid units 13.

[0031] In some other embodiments, the grid unit 13 is in the shape of a rhombus.

[0032] In some other embodiments, the connector 12 is a closed-loop wavy structure, and for the same support member 11, part of the support crests 112 and / or part of the support troughs 113 are not connected to the connector 12. In other words, for the same support member 11, part of the support crests 112 and / or part of the support troughs 113 may be in a suspended state. For example, the length of some connecting segments 121 on the connector 12 is relatively long, so that part of the support crests 112 and / or part of the support troughs 113 can be fixed to another support crest 112 or support trough 113 along the circumferential interval, so that part of the support crests 112 and / or part of the support troughs 113 are in a suspended state. The existence of the suspended state is conducive to increasing the blood supply to the visceral arteries, reducing the risk of the vascular stent 10 obstructing the blood supply to the visceral arteries, and improving the flexibility of the vascular stent 10.

[0033] In some other embodiments, the connector 12 is an open-loop wave-shaped structure. In other words, the connector 12 is a discontinuous ring-shaped structure, so that part of the supporting wave crests 112 and / or part of the supporting wave troughs 113 are not connected to the axially adjacent supporting members 11 through the connector 12. In other words, for the same supporting member 11, part of the supporting wave crests 112 and / or part of the supporting wave troughs 113 may be in a suspended state. For example, the multiple connecting segments 121 on the discontinuous connector 12 are not connected in sequence at an angle along the circumferential direction. The discontinuous ring-shaped connector 12 is formed by a plurality of arc segments; the arc segment is formed by at least two connecting segments 121 connected at an angle, and the plurality of arc segments are arranged at intervals along the circumferential direction.

[0034] The connecting member 12 is a non-continuous open-loop wave-shaped structure, and the number of angles formed by the arc segment has one or more of the following modes: a. The arc segment forms an angle, which is the first connecting portion 122, and the two ends of the arc segment in the length direction are respectively the second connecting portions 123. In two axially adjacent support members 11, the first connecting portion 122 of the connecting member 12 is fixed to the supporting trough 113 or supporting crest 112 of one of the support members 11, and the second connecting portion 123 of the connecting member 12 is fixed to the supporting crest 112 or supporting trough 113 of the other support member 11;

[0035] b. The arc segment forms at least two angles, at least two of which are adjacent in the circumferential direction, one of the circumferentially adjacent angles is the first connecting portion 122, the other circumferentially adjacent angle and the two ends of the arc segment in the length direction are the second connecting portions 123 respectively; of the two axially adjacent support members 11, the first connecting portion 122 of the connecting member 12 is fixed to the supporting trough 113 or the supporting crest 112 of one of the support members 11, and the second connecting portion 123 of the connecting member 12 is fixed to the supporting crest 112 or the supporting trough 113 of the other support member 11.

[0036] It can be understood that "the number of angles formed by the arc segments has one or more of the following methods" can be that all arc segments adopt method a, or all arc segments adopt method b, or a combination of some arc segments adopt method a and some arc segments adopt method b.

[0037] The supporting member 11 is made of superelastic shape memory material.

[0038] Generally, a general stent may need to be expanded by balloon expansion technology, which may block blood flow and cause adverse complications. At the same time, due to blood flow blocking, blood flow impacts the stent in one direction, which may also cause inaccurate positioning of the stent, resulting in displacement of the stent, and poor stent implantation effect. By using a superelastic shape memory material for the support member 11, the vascular stent 10 can be expanded without the need for balloon expansion technology, and the vascular stent 10 can be self-expanded to fit the inner wall of the blood vessel.

[0039] The connecting member 12 and / or the supporting skeleton 202 are made of super elastic shape memory material.

[0040] The superelastic shape memory material enables the support frame 202, the support member 11 and the connector 12 to contract or expand radially, that is, the support frame 202, the support member 11 and the connector 12 have radial expansion capability, can be compressed under the action of external force and self-expand or mechanically expand to recover to the initial shape and maintain the initial shape after the external force is removed, so that after implantation into the blood vessel, the radial support force can be applied to the blood vessel wall. The shape memory material includes but is not limited to at least one of nickel-titanium alloy, nitinol alloy, nickel-titanium superelastic alloy, cobalt-chromium-nickel-molybdenum alloy, copper-based shape memory alloy, iron-based shape memory alloy, etc.

[0041] In some embodiments, the wire diameter and / or rigidity of the connecting member 12 is smaller than that of the supporting member 11. Rigidity can be understood as a degree of deformation.

[0042] In one or more embodiments, the wire diameter of the connector 12 is smaller than the wire diameter of the support member 11. This arrangement is beneficial to both ensuring the radial support force of the vascular stent 10 and improving the flexibility of the vascular stent 10. The vascular stent 10 has a smaller elongation before and after release, is easier to position, and improves the positioning accuracy of the vascular stent 10.

[0043] In one or more embodiments, the connector 12 is formed by twisting or weaving together multiple strands of superelastic material. This arrangement is conducive to making the vascular stent 10 have a uniform and reasonable radial support force and good axial support performance, which is conducive to avoiding the stacking and shortening of the stent; it is also conducive to avoiding the problem of new interlayer ruptures caused by excessive radial support force, and it is also conducive to ensuring that the vascular stent 10 has good bending flexibility and can adapt to various forms of aortic anatomical structures.

[0044] In one or more embodiments, the connector 12 is a biocompatible polymer fabric in the form of a line, a sheet, or a plurality of strands of silk threads wound together.

[0045] In one or more embodiments, the support member 11 is a biocompatible polymer fabric in the form of a line, a sheet, or a plurality of strands of silk threads wound together.

[0046] The coating 201 and / or the connector 12 are biocompatible polymer fabrics. Biocompatible polymer fabrics include, but are not limited to, woven or knitted polyesters, such as at least one of polyethylene terephthalate, polyethylene terephthalate, polylactide, polyglycolide and copolymers; fluorinated polymers, such as polytetrafluoroethylene, expanded or electrospun polytetrafluoroethylene and polyvinylidene fluoride; polysiloxanes, such as polydimethylsiloxane; polyurethanes, such as polyether polyurethanes, polyurethane ureas, polyether polyurethane ureas, polyurethanes containing carbonate bonds, wound nickel titanium and polyurethanes containing siloxane segments; silicone, ultra-high molecular weight polyethylene, fluorinated ethylene propylene copolymers or other suitable materials. For example, the connector 12 is made of at least one of PET, PP, PTFE or e-PTFE materials. For example, the coating 201 is made of at least one of PET, PP, PTFE or e-PTFE materials.

[0047] The vascular stent 10 may be bent and bulged due to bending in a complex vascular anatomical structure. The bulged vascular stent 10 may hinder the correct flow of blood, may cause unpredictable changes in hemodynamics, and affect the blood supply of the visceral arteries. The connector 12 is designed in a biocompatible polymer fabric, which can help improve the flexibility of the vascular stent 10, help reduce the need for flexibility to ensure diseased blood vessels, better expand the true lumen 101, and restore the correct flow direction of the target blood vessel. It is helpful to reduce the problem that the vascular stent 10 may be bent and bulged due to bending in a complex vascular anatomical structure, which can help reduce the interference of the vascular stent 10 on the visceral arteries, and help blood flow to the visceral arteries more smoothly and unimpeded.

[0048] In one or more embodiments, the connecting member 12 is made of at least one strand of superelastic material and at least one strand of biocompatible polymer fabric by twisting or weaving together.

[0049] In one or more embodiments, the connector 12 is made of a degradable material, for example, the degradable material may be at least one of magnesium, iron, zinc, magnesium-based alloy, iron-based alloy, zinc-based alloy, polylactic acid or polycarbonate.

[0050] In one or more embodiments, the local connecting element 12 is made of polymer fabric, and at least part of the connecting element 12 is made of superelastic shape memory material.

[0051] For the support member 11 located at the proximal end of the vascular stent 10, the support crest 112 on the proximal support member 11 includes a plurality of first crests 114 and at least one second crest 115, and the axial length of the second crest 115 is longer than the axial length of the first crest 114. The proximal end of the second crest 115 is closer to the proximal end of the vascular stent 10 than the proximal end of the first crest 114, in other words, the proximal end of the second crest 115 extends beyond the proximal end of the first crest 114 toward the proximal end of the vascular stent 10.

[0052] In some embodiments, the number of the second wave crests 115 is at least three, and along the circumference of the vascular stent 10, one or more first wave crests 114 are spaced between two adjacent second wave crests 115. It can be understood that one or more first wave crests 114 are spaced between two adjacent second wave crests 115, and the same number of first wave crests 114 may be spaced between any two adjacent second wave crests 115, or different numbers of first wave crests 114 may be spaced between any two adjacent second wave crests 115, or the number of first wave crests 114 spaced between at least two adjacent second wave crests 115 may be different from the number between any other two adjacent second wave crests 115, etc.

[0053] The first wave crest 114 is used to be detachably hooked on the interventional instrument. After radial compression, the vascular stent 10 is detachably hooked on the interventional instrument through the first wave crest 114. The interventional instrument delivers the compressed vascular stent 10 to the location of the vascular lesion and then releases it to restore the vascular stent 10 to a predetermined shape. The implanted vascular stent 10 can support the diseased blood vessel segment, allowing blood to flow through the vascular stent 10 to restore the correct flow direction of the blood vessel, maintain smooth blood flow in the vascular lumen, and thereby achieve a therapeutic effect.

[0054] The vascular stent 10 also includes at least one row of positioning ribs, each row of positioning ribs includes at least one keel 14, and at least one keel 14 is fixed to the proximal end of the vascular stent 10. The two ends of the keel 14 in the length direction are respectively fixed to the support rods 111 of the two support members 11, and the fixing method can be one or more of winding, knotting, welding, hot pressing, bonding, mechanical fixation (such as steel sleeve) and suture thread suturing. The support members 11 where the two ends of the keel 14 in the length direction are located are adjacent along the axial direction of the vascular stent 10; or there is at least one support member 11 between the two ends of the keel 14 in the length direction (excluding the support members 11 where the two ends of the keel 14 in the length direction are located).

[0055] In some embodiments, two ends of the keel 14 in the length direction are respectively fixed to the middle parts of the support rods 111 on the two support members 11 in the length direction.

[0056] In some embodiments, the keel 14 is located at the distal end or the middle portion of the vascular stent 10 .

[0057] In some embodiments, the length direction of the keel 14 extends along the length direction of the vascular stent 10; or the length direction of the keel 14 and the length direction of the vascular stent 10 have an angle, in other words, the keel 14 is fixed to the vascular stent 10 at an angle.

[0058] In one or more embodiments, the vascular stent 10 includes at least one row of positioning ribs, each row of positioning ribs includes at least two keels 14, at least two keels 14 are arranged at intervals along the axial direction of the vascular stent 10, and at least two keels 14 are respectively located at the proximal end and the distal end of the vascular stent 10.

[0059] In one or more embodiments, the vascular stent 10 includes at least two rows of positioning ribs, which are spaced apart along the circumference of the vascular stent 10. Each row of positioning ribs includes at least two keels 14, which are spaced apart along the axial direction of the vascular stent 10, and the at least two keels 14 are located at the proximal end and the distal end of the vascular stent 10, respectively.

[0060] The support members 11 at both ends of the keel 14 in the length direction are adjacent to each other along the axial direction of the vascular stent 10; or there is at least one support member 11 between the two ends of the keel 14 in the length direction (excluding the support members 11 at both ends of the keel 14 in the length direction).

[0061] For the same row of positioning ribs, the length direction of at least two keels 14 is parallel to the length direction of the vascular stent 10, and at least two keels 14 are opposite to each other along the length direction of the vascular stent 10, so as to facilitate the operator to judge the release position of the vascular stent 10 and improve the positioning accuracy of the vascular stent 10.

[0062] See also Figure 4 , Figure 4 for Figure 2 The plan view of another possible implementation of the vascular stent 10 is shown. In one or more embodiments, the wave crests of the support members 11 at the proximal end of the vascular stent 10 are located in the same horizontal direction.

[0063] The material of the keel 14 can be the same as that of the support member 11 or the connecting member 12 . For example, the keel 14 can be a biocompatible polymer fabric, or a superelastic nickel-titanium wire, etc.

[0064] The keel 14 may be formed by twisting or braiding a single strand or a plurality of strands of superelastic material together.

[0065] The keel 14 can be formed by twisting or weaving multiple strands of superelastic material together, so that the vascular stent 10 has better flexibility.

[0066] For possible application scenarios of the bracket system, see Figure 5 , Figure 5This is a schematic diagram of a scenario in which the stent system provided in an embodiment of the present application is used to reconstruct the thoracic aorta and the abdominal aorta. The coated stent 20 is released into the thoracic aorta, and the vascular stent 10 is connected to the distal end of the coated stent 20. It is expected that the coated stent 20 at least partially isolates the formed aneurysm cavity 100 and the proximal rupture 103, and the vascular stent 10 is implanted in the distal aortic true lumen 101. It is expected that the vascular stent 10 has the effect of isolating the distal rupture, which is conducive to solving the problem of distal poor perfusion, and is conducive to promoting complete thrombosis of the false lumen 102, and achieving a good remodeling effect of the true lumen 101; retaining the visceral arteries, reducing long-term and secondary prognosis, and reducing the risk of new dissections induced by the distal vascular stent 10. The introduction of the vascular stent 10 is also conducive to limiting the excessive expansion of the coated stent 20, and preventing the edge of the coated stent 20 from damaging the aortic intima, thereby reducing the incidence of new distal ruptures.

[0067] The above implementation modes are merely descriptions of the preferred implementation modes of the present application, and are not intended to limit the scope of the present application. Without departing from the design spirit of the present application, various modifications and improvements made to the technical solutions of the present application by ordinary engineering and technical personnel in the field shall fall within the protection scope determined by the claims of the present application.

Claims

1. A vascular stent, the vascular stent being a self-expanding stent, characterized in that: include: A plurality of support members, each of which is an annular wave-shaped structure; A plurality of connecting pieces, each of which is a ring-shaped wave-shaped structure; The plurality of support members are arranged at intervals along the axial direction of the vascular stent, and the connecting member is connected and fixed to two axially adjacent support members, so that the vascular stent forms a proximal opening, a distal opening and an axially extending inner cavity; the wire diameter and / or rigidity of the connecting member is smaller than that of the support member; At least one row of positioning ribs, each row of positioning ribs includes at least one keel, and the two ends of the keel in the length direction are respectively fixed to the two support members; the support members where the two ends of the keel in the length direction are located are adjacent along the axial direction of the vascular stent, or there is at least one support member between the two ends of the keel in the length direction.

2. The vascular stent according to claim 1, characterized in that: Each row of the positioning ribs includes at least two keels, and the at least two keels are spaced apart along the axial direction of the vascular stent. The at least two keels are respectively located at the proximal end and the distal end of the vascular stent.

3. The vascular stent according to claim 2, characterized in that: For the positioning ribs in the same row, the length direction of at least two of the keels is parallel to the length direction of the vascular stent, and at least two of the keels are opposite to each other along the length direction of the vascular stent; or the length direction of the keel and the length direction of the vascular stent have an angle.

4. The vascular stent according to any one of claims 1 to 3, characterized in that: The blood vessel stent comprises at least two rows of positioning ribs, and the at least two rows of positioning ribs are arranged at intervals along the circumference of the blood vessel stent.

5. The vascular stent according to claim 4, characterized in that: The support member comprises a plurality of support rods connected in sequence at an angle, two adjacent angles in the circumferential direction are a support crest and a support trough respectively, the support crest and the support trough are alternately arranged along the circumference of the support member, and the support crest is closer to the proximal end of the vascular stent than the support trough; The two ends of the keel in the length direction are respectively fixed to the middle parts of the support rods in the length direction on the two support members.

6. The vascular stent according to claim 1, characterized in that: The support member comprises a plurality of support rods connected in sequence at an angle, two adjacent angles in the circumferential direction are a support crest and a support trough respectively, the support crest and the support trough are alternately arranged along the circumference of the support member, and the support crest is closer to the proximal end of the vascular stent than the support trough; In two axially adjacent support members, the support wave crest of the support member near the proximal end and the support wave trough of the support member near the distal end are axially opposite to each other, or the support wave crest of the support member near the proximal end and the support wave crest of the support member near the distal end are axially opposite to each other.

7. The vascular stent according to claim 6, characterized in that: The connecting member is a closed-loop wavy structure, and the connecting member includes a plurality of connecting segments connected at an angle, and the plurality of connecting segments are connected in sequence at an angle, and two circumferentially adjacent angles are respectively a first connecting portion and a second connecting portion, and the first connecting portion and the second connecting portion are alternately arranged along the circumference of the connecting member, and the first connecting portion is closer to the proximal end of the vascular stent than the second connecting portion; in the two axially adjacent support members, the first connecting portion of the connecting member is fixed to the support wave trough of the support member near the proximal end, and the second connecting portion of the connecting member is fixed to the support wave peak of the support member near the distal end.

8. The vascular stent according to claim 6, characterized in that: The connecting piece is a non-continuous open-loop wave-shaped structure, and the non-continuous open-loop connecting piece is formed by a plurality of arc segments, and the arc segments include at least two connecting segments connected at an angle, and the plurality of arc segments are arranged at intervals along the circumferential direction, and the number of the arc segments forming the angle has one or more of the following modes: a. The arc segment forms an angle, the angle is the first connection portion, and the two ends of the arc segment in the length direction are the second connection portions respectively. In two axially adjacent support members, the first connection portion of the connection member is fixed to the support trough or the support crest of one of the support members, and the second connection portion of the connection member is fixed to the support crest or the support trough of the other support member; b. The arc segment forms at least two angles, at least two of which are adjacent in the circumferential direction, one of the circumferentially adjacent angles is a first connection portion, and the other circumferentially adjacent angle and both ends of the arc segment in the length direction are second connection portions respectively; of the two axially adjacent support members, the first connection portion of the connection member is fixed to the support trough or the support crest of one of the support members, and the second connection portion of the connection member is fixed to the support crest or the support trough of the other support member.

9. The vascular stent according to any one of claims 6 to 8, characterized in that: For the same supporting member, part of the supporting wave crests and / or part of the supporting wave troughs are not connected to the connecting member, so that part of the supporting wave crests and / or part of the supporting wave troughs are in a suspended state.

10. The vascular stent according to claim 1, characterized in that: The supporting member is made of a superelastic shape memory material, and / or at least part of the connecting member is made of one or more of a biocompatible polymer fabric, a degradable material and a superelastic shape memory material.

11. A support system, characterized in that: It comprises a coated stent and at least one of the vascular stents described in any one of claims 1-10, wherein the coated stent comprises a proximal opening, a distal opening and an axially extending inner cavity, the coated stent is a self-expanding stent, and the vascular stent is connected to at least one of the proximal end and the distal end of the coated stent; the coated stent comprises a coating and a supporting frame fixed to the coating.

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