Support and support system comprising same

Abstract

The invention relates to a support and a support system comprising the same. The stent comprises a tubular stent main body and at least one stent auxiliary structure; the support auxiliary structure comprises: at least two support column elements having a first end, a second end and a convex structure located between the first end and the second end; a converging tip; a connecting line of the first ends and the second ends of the at least two supporting column elements rotates around a straight line passing through the second ends to form a first conical surface, the convex points of the convex structures are located outside the first conical surface, and the straight line passing through the second ends is defined as a first conical axis; the first conical axis is collinear with a central axis of the tubular stent body. The stent is provided with the stent auxiliary structure, the stent auxiliary structure can be matched with different grid shapes of the stent, synchronous contraction and expansion of the stent in the conveying and expansion states and in the state conversion process are achieved, and local extrusion deformation caused by asynchronous deformation is avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of vascular stents, and in particular relates to a stent and a stent system comprising the same. Background Art

[0002] Neurointervention is the diagnosis and treatment of lesions involving the human neurovascular system by using intravascular catheter operation technology with the support of digital subtraction angiography (DSA) system, through specific methods such as selective angiography, interventional embolization, dilatation and shaping, mechanical removal, and drug delivery. According to different functions and scopes of application, neurointerventional medical devices can be divided into three categories: hemorrhagic stroke treatment, ischemic stroke treatment, and access. Among them, hemorrhagic stroke treatment products are mainly used to treat intracranial aneurysms and block abnormal blood vessels, and ischemic stroke treatment products are mainly used to treat acute ischemic stroke and cerebrovascular occlusive diseases (such as intracranial atherosclerotic diseases, etc.). At present, a variety of self-expanding stents have been developed for the treatment of neurovascular diseases, such as blood flow-guided dense mesh stents, coil-assisted stents, intracranial thrombectomy stents, intracranial stents, etc.

[0003] In a clinical setting, the visibility of the stent is very important for neurointerventional surgery. Usually, under the guidance of X-ray equipment, the direction and path of minimally invasive instruments in the blood vessels, the instruments reaching the lesion site, and the operations to clear the lesion site can be seen. In order to increase the visibility of the stent, the common means of visualizing the stent in the prior art is to set up additional visualization devices. The setting of the additional device needs to consider whether the resistance will change during the delivery of the stent, whether the stent will cause damage to the blood vessel during the pushing and pulling process in the blood vessel, and whether there is a risk of deformation of the stent during the conversion of the delivery and expansion state.

[0004] Typically, a stent operates in a tortuous path of a blood vessel in the body and needs to have both a certain radial support and good flexibility. Therefore, those skilled in the art will design the grid structure of the stent differently. How to arrange additional devices to meet the aforementioned requirements for the arrangement of additional devices is a technical problem that needs to be solved in this field, especially how to arrange additional devices for stents with different grid structures is a technical difficulty faced by this field. Summary of the invention

[0005] In view of the technical problems existing in the prior art, one of the purposes of the present application is to provide a stent, the stent comprising a tubular stent body and at least one stent auxiliary structure; the tubular stent body has a central axis, and a section perpendicular to the central axis is defined as an axis-perpendicular section;

[0006] The support auxiliary structure comprises:

[0007] At least two support column elements, having a first end, a second end and a convex structure located between the first end and the second end; the first end is connected to the tubular support body;

[0008] A converging end, where the second ends of the support column elements in the support auxiliary structure converge;

[0009] The line connecting the first end and the second end of the at least two supporting column elements rotates around the straight line passing through the second end to form a first conical surface, the convex point of the convex structure is located outside the first conical surface, and the straight line passing through the second end is defined as a first conical axis; the first conical axis is colinear with the central axis of the tubular support body.

[0010] The stent provided in the present application can be a tubular grid stent of any structure, and the grid shape is not specifically limited. The stent auxiliary structure, as an additional device, is configured to have a convex structure, and the configuration of the convex structure enables the stent auxiliary structure to more conveniently match the tubular grid stent with different grid shapes, so that the additional device can shrink and expand synchronously with the stent during the transformation process of the stent delivery and expansion, thereby avoiding local extrusion deformation caused by asynchronous deformation.

[0011] The tubular stent body is formed by laser cutting a tube having shape memory and superelastic properties, for example, it can be formed by laser cutting a nickel-titanium alloy tube.

[0012] Preferably, in the support column element, a first column section is formed between the first end and the convex structure, and the first column section of the support column element is parallel to the first cone axis.

[0013] The setting of the first column section parallel to the axis of the first cone can ensure that the first column section of the support auxiliary structure will not change in axial length as the tubular support radially contracts and expands. The length of the first column section can be adjusted by technical personnel in this field according to actual conditions to adapt to different starting points of support column elements, thereby being able to adapt to supports of different grid shapes (i.e., tubular mesh support).

[0014] Preferably, in the same support auxiliary structure, the lengths of the first column sections of different supporting column elements are independently selected to be the same or different.

[0015] In the same stent auxiliary structure, if the starting points of the support column elements are the same, the length of the first column section is preferably set to be the same, so as to keep synchronization with the tubular stent during the conversion process between the transport and expansion states. However, the starting point of the support column element is usually set as the connection part with the tubular stent, and the connection part set at the connection part often has an outer peripheral dimension that is significantly larger than the radial dimension of the tubular stent beam column. Since the starting points of the support column elements are the same, the radial dimension of this part in the transport state (the tubular stent is in a contracted state) will be significantly increased, affecting the smoothness of the tubular stent push. Therefore, the present application preferably sets the starting points of the support column elements to be different. In order to keep the stent auxiliary structure and the tubular stent deforming synchronously during the conversion process between the transport and expansion states, the length of the first column section is usually set to be different to ensure that the convex structure is set at the same position.

[0016] Preferably, the convex points of the support column elements in the same support auxiliary structure are all located on the second conical surface, the axis of the second conical surface is colinear with the axis of the first cone, and the vertex is the second end.

[0017] Preferably, the protrusions of the support column elements in the same bracket auxiliary structure are located on the same axial vertical section.

[0018] In the present application, the convex points of the convex structure are arranged on the same axial vertical section, and the convex points of the supporting column elements in the same bracket auxiliary structure are all located on the second conical surface. It can be understood that the convex points are at the same length from the second end. This arrangement allows different supporting column elements to be synchronized when the radial size of the bracket changes from the convex points to the second end, and the deformation of the converging end will not occur due to the asynchronous changes of different supporting column elements when the radial size of the bracket changes.

[0019] Preferably, in the supporting column element, a second column section is formed between the convex structure and the second end; and the second column sections of different supporting column elements of the same bracket auxiliary structure are located on the same second conical surface.

[0020] In more cases, different support column elements in the same stent auxiliary structure have the same convex structure, the same convex point position, and the same length of the second column section and the same angle with the axis. This arrangement can ensure that different support column elements in the same stent auxiliary structure have the same rate of change from the convex point to the second end as the radial dimension of the stent changes (radial compression and expansion), that is, as the radial dimension of the stent changes, different support column elements in the same stent auxiliary structure have the same change trend, and during the transformation of the stent delivery and expansion states, the convergent end is always on the central axis, and will not squeeze or pull the stent, causing unacceptable deformation of the stent.

[0021] Preferably, the angle between the first column section and the second column section toward the proximal end is an obtuse angle, preferably 100-150°, such as 110°, 120°, 130°, 140°, etc.

[0022] The stent needs to have a certain radial expansion and support force to better expand to a predetermined size to achieve the surgical purpose (such as embedding inside a thrombus or supporting a blood vessel). The second column is set to an inclined shape to obtain a decomposition force in the radial direction to provide assistance for the radial expansion of the stent. The angle between the first column and the second column toward the proximal end is an obtuse angle, and is preferably 100 to 150°. If the angle is too large, the radial decomposition force is small and the support effect is not obvious; if the angle is too small, the radial support effect is obvious, but greater force is often required during the recovery process, affecting the smoothness of the recovery.

[0023] Preferably, the projections of the support column elements of the same support auxiliary structure onto the perpendicular section are arranged radially with the converging end as the center, and the included angles of the projections of the second columnar sections of adjacent support column elements are the same.

[0024] The support column elements arranged radially with the converging end as the center can ensure the uniform distribution of the radial support force of the support column elements along the circumferential direction. The evenly distributed radial support force makes it less likely for the stent to twist when it expands in the body, making it easier to achieve surgical purposes (such as embedding a blood clot), and less likely to collapse or fold when pushed into a blood vessel.

[0025] As one of the optional implementation schemes, the support auxiliary structure includes two support column elements designed in one piece, and the converging ends of the two support column elements are bent ends with a return bend.

[0026] As one of the further optional embodiments, the support auxiliary structure comprises more than three support column elements, and the more than three support column elements are designed as one body, and the first end is a multi-head end, and the second end is a single head end;

[0027] As one of still another optional implementation schemes, the support auxiliary structure includes more than three support column elements, and each of the support column elements is independently arranged, and the second end of each support column element is converged at a converging end through a convergence component.

[0028] Preferably, the support auxiliary structure further comprises a connecting component connected to the first end of each supporting column element for connecting to the tubular support body.

[0029] The connection component described in the present application can be selected from known or new connection components to connect the first end to the tubular stent body.

[0030] Preferably, the connecting component includes any one of a sleeve component and a clamping component, or a combination of at least two of them.

[0031] Preferably, the first column section, the convex structure, the second column section, the connecting component and the converging end are each independently selected from radiopaque materials.

[0032] The whole or part of the structure of the stent auxiliary structure is set as a radiopaque material to provide its visibility, and the visibility of the stent is achieved by virtue of the positional relationship between the stent auxiliary structure and the stent. The radiopaque material can be composed of several nickel-titanium alloy wires with a radiopaque core (e.g., platinum).

[0033] Preferably, the stent auxiliary structure is arranged inside and / or at the distal end of the tubular stent body.

[0034] A person skilled in the art can select the location of the stent auxiliary structure in the tubular stent body according to actual conditions. Normally, when the axial length of the tubular stent is relatively long, the stent auxiliary structure can be simultaneously arranged inside the tubular stent body and at the distal end. Even when the axial length of the tubular stent is sufficiently long, the stent auxiliary structure can be simultaneously arranged at multiple locations inside the tubular stent body and at the distal end. If the tubular stent is relatively short, the stent auxiliary structure can be arranged inside the tubular stent body or at one location at the distal end. Normally, in order to be able to visualize the distal end of the tubular stent, it is preferred to arrange the stent auxiliary structure at the distal end of the tubular stent body.

[0035] Preferably, the support is provided with two or more support auxiliary structures, and the projections of the support column elements of all the support auxiliary structures on the axial perpendicular section do not overlap.

[0036] Preferably, the projection of all the support column elements of the auxiliary structure of the stent on the axial perpendicular section is arranged radially at equal angles with the projection point of the central axis of the tubular stent body as the center.

[0037] In the stent, the stent auxiliary structures are arranged at different radial deflection angles, and preferably all the stent auxiliary structures are radially arranged at equal angles with the projection of the central axis of the tubular stent body as the center in the axial vertical section, which can provide uniform radial support force for the stent to the greatest extent.

[0038] Preferably, the stent is provided with two or more stent auxiliary structures, and the stent auxiliary structures are evenly distributed along the axial direction on the tubular stent body.

[0039] The fact that the auxiliary structures of the stent are evenly distributed along the axial direction on the tubular stent body in the present application means that the first ends of the auxiliary structures of the stent are evenly distributed at equal distances on the tubular stent body.

[0040] Preferably, the tubular support body has a hollow grid, and the unit grids of the hollow grid are formed by connecting beams and columns head to tail, and adjacent unit grids include adjacent unit grids sharing a common intersection and adjacent unit grids sharing a common beam and column;

[0041] The first end of the stent auxiliary structure located inside the tubular stent body is directly or indirectly connected to the intersection of adjacent unit grids that share the common intersection.

[0042] The first end of the stent auxiliary structure described in the present application is connected to the intersection of adjacent unit grids that share a common intersection, and can transmit radial support force to the beams and columns of adjacent unit grids with the intersection as the center point when the stent auxiliary structure provides radial support force, so that the tubular stent body can maintain better radial support in the blood vessel, and when used as a thrombus removal stent, it can better embed vascular foreign bodies such as thrombi.

[0043] The second object of this application is to provide a support system, comprising:

[0044] The bracket described in one of the purposes;

[0045] A push wire connected to the proximal end of the stent;

[0046] A catheter is used to deliver the stent.

[0047] Compared with the prior art, this application has the following beneficial effects:

[0048] The stent provided in the present application is provided with a stent auxiliary structure for visually designing the stent. At the same time, the stent auxiliary structure can adapt to different grid shapes of the stent to achieve synchronous contraction and expansion with the stent in the transport and expansion states and during the state transformation process, thereby avoiding local extrusion deformation due to asynchronous deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 A schematic diagram of a grid structure of a middle portion of a tubular stent body 100 of the stent provided in Example 1;

[0050] Figure 2 A schematic diagram of the three-dimensional structure of a tubular stent body 100 of the stent provided in Example 1;

[0051] Figure 3 A schematic front view of the structure of the stent auxiliary structure of the tubular stent body 100 of the stent provided in Example 1;

[0052] Figure 4 A schematic side view of the structure of the stent auxiliary structure of the tubular stent body 100 of the stent provided in Example 1;

[0053] Figure 5 This is a schematic diagram of the grid structure of the distal end portion of the stent described in Example 2;

[0054] Figure 6 This is a schematic diagram of the three-dimensional structure of the distal end portion of the stent described in Example 2;

[0055] Figure 7 A schematic diagram of a structure of a support auxiliary structure having two support column elements;

[0056] Figure 8 It is a schematic diagram of the grid structure of the middle part where the free connection end 103 is connected to the beam column of the connection unit grid 141. DETAILED DESCRIPTION

[0057] The technical solution of the present invention is further explained below in conjunction with the specific implementation method. However, it should be noted that the specific implementation method is only a specific implementation and explanation of the essence of the technical solution of the present invention, and should not be understood as a limitation on the protection scope of the present invention. It should also be noted that for the convenience of description, only the parts related to the relevant invention are shown in the drawings.

[0058] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", etc. 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. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0059] In the description of the present application, it should be understood that the terms "distal end" and "proximal end" should be understood as viewed from the direction of the surgical operator, the "distal end" is the end away from the surgical operator, and the "proximal end" is the end close to the surgical operator. The term "axial" should be understood as the direction of stent pushing or the length of the guidewire, "radial" should be understood as the perpendicular direction of the "axial direction", and "circumferential" should be understood as the circumferential direction, that is, the direction around the length of the stent, that is, perpendicular to the axial direction and perpendicular to the cross-sectional radius.

[0060] In the description of the present application, it should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other.

[0061] like Figure 1 to Figure 4 ( Figure 1 A schematic diagram of a grid structure of a middle portion of a tubular stent body 100 of the stent provided in Example 1; Figure 2 A schematic diagram of the three-dimensional structure of a tubular stent body 100 of the stent provided in Example 1; Figure 3 A schematic front view of the structure of the stent auxiliary structure of the tubular stent body 100 of the stent provided in Example 1; Figure 4As shown in the side structural schematic diagram of the stent auxiliary structure of the tubular stent body 100 of the stent provided in Example 1, Example 1 provides a stent, including:

[0062] A tubular support body 100, wherein the tubular support body 100 has a hollow grid, wherein the unit grids of the hollow grid are formed by connecting beams and columns head to tail, and adjacent unit grids share intersections and / or common beams and columns; free connection ends 103 are provided inside the three unit grids, wherein the free connection ends 103 are provided at the common intersections of the unit grids and are parallel to the central axis 10, and are used to connect the support auxiliary structure. The unit grids provided with free connection ends 103 are defined as connection unit grids 141, and the unit grids not provided with free connection ends 103 are defined as basic unit grids 142; the lengths of the free connection ends 103 are different. The three connection unit grids 141 are located in the same circumferential direction.

[0063] It should be noted that, in other implementations, the unit grid may be deformed according to actual conditions, such as removing a common intersection or a common beam to form a grid with larger meshes.

[0064] Two stent auxiliary structures, a middle stent auxiliary structure 200 disposed in the middle of the tubular stent body 100 and a distal stent auxiliary structure 300 disposed at the distal end of the tubular stent body 100; the tubular stent body has a central axis 10, and a section perpendicular to the central axis is defined as an axis-perpendicular section;

[0065] The middle support auxiliary structure 200 and the distal support auxiliary structure 300 have the same structure, except for the connection position with the tubular support body 100. The middle support auxiliary structure 200 is used as an example for detailed description below:

[0066] The middle support auxiliary structure 200 includes:

[0067] Three support column elements 210, each of which has a first end 211, a second end 212 and a convex structure 213 located between the first end 211 and the second end 212; the first end 211 is connected to the tubular support body 100; the line connecting the first end 211 and the second end 212 of the three support column elements 210 rotates around a straight line passing through the second end 212 to form a first conical surface 30, the convex point 214 of the convex structure 213 is located outside the first conical surface 30, and the straight line passing through the second end 212 is defined as a first conical axis 20; the first conical axis 20 is colinear with the central axis 10 of the tubular support body 100;

[0068] In the support column element 210, the first section column 216 is between the first end 211 and the convex structure 213, and the second section column 218 is between the convex structure 213 and the second end 212; each first section column 216 of the support column element 210 is parallel to the first cone axis 20, and each second section column 218 is located on the same second cone surface 40; the convex points 214 of three different support column elements 210 are all located on the second cone surface 40, the axis of the second cone surface 40 is colinear with the first cone axis 20, and the vertex is the second end 212; and the convex points 214 of the three different support column elements 210 are located on the same axial perpendicular section. The axial perpendicular section is defined as a plane perpendicular to the axis. The angle α (towards the proximal end) between the first section column 216 and the second section column 218 is 120°±5°.

[0069] The first end 211 of each supporting column element 210 is provided with a connecting component 217, and the connecting component 217 is in the shape of a sleeve, one end of which is sleeved on the first end 211 of the supporting column element 210, and the other end of which is sleeved on the free connecting end 103 extending from the tubular support body 100; the free connecting end 103 is designed as an integral whole with the tubular support body 100, and has a free end that can penetrate into the sleeve of the connecting component 217; the lengths of the first section column 216 are different, and are matched with three free connecting ends 103 with different lengths.

[0070] In the middle support auxiliary structure 200, the lengths of the first column sections 216 of different support column elements 210 are different, so that the connecting parts 217 can be located at different axial vertical sections, avoiding a significant increase in radial dimensions on the same axial vertical section, which would increase the push resistance. The different lengths of the first column sections 216 can be adjusted by the length of the free connection end 103 to ensure that the protrusions 214 are located at the same axial vertical section.

[0071] The second ends 212 of the support column elements 210 in the auxiliary structure of the stent converge at the convergent end 220. The projections of the three support column elements 210 to the vertical section (the vertical section through the convergent end 220) are arranged radially with the convergent end 220 as the center, and the angles β of the projections of the second column sections 218 of the adjacent support column elements 210 are the same (allowable installation deviation), which is about 120°. The convergent end 220 converges the distal ends of the three support column elements 210 by winding.

[0072] It should be noted that Figure 1The connection method between the distal support auxiliary structure 300 and the tubular support body 100 is not shown. The specific connection method is similar to the connection method between the middle support auxiliary structure 200 and the tubular support body 100, except that the free connection end 103 is set at the distal end of the tubular support body 100. The distal support auxiliary structure 300 and the middle support auxiliary structure 200 can be projected onto the same axial vertical section at the same time. The projections of the six support column elements are radially arranged with the converging end 220 (i.e., the axis point) as the center of the circle, and the angles of the second columnar projections of adjacent support column elements are the same, dividing the circumferential angle of 360° in half.

[0073] like Figures 5-6 ( Figure 5 This is a schematic diagram of the grid structure of the distal end portion of the stent described in Example 2, Figure 6 As shown in the three-dimensional structural schematic diagram of the distal part of the stent described in Example 2, Example 2 provides a stent, including a tubular stent body 100 and a distal stent auxiliary structure 300 arranged at the distal end of the tubular stent body 100.

[0074] The tubular support body 100 has a hollow grid, and the unit grids of the hollow grid are formed by connecting beams and columns head to tail, and adjacent unit grids share intersections and / or common beams and columns. A free connection end 103 is extended at the intersection of two beams and columns at the far end of the basic grid at the far end of the tubular support body 100, and the free connection end 103 extends from the intersection of the two beams and columns to the far end. The far-end unit grid provided with the free connection end 103 is defined as the far-end unit grid 143.

[0075] The distal stent auxiliary structure 300 has the same structure as the middle stent auxiliary structure 200 described in Example 1, but is connected to the distal end of the tubular stent 100 .

[0076] Since the distal stent auxiliary structure 300 is disposed at the distal end of the tubular stent 100, the radially allowed size adjustment space is relatively large, and the length of the free connection end 103 and the length of the first column type 216 of different support column elements of the same stent auxiliary structure can be set to be the same. In this case, the connection position of the stent auxiliary structure and the tubular stent 100 is in the same axial section. In other cases, the length of the free connection end 103 and the length of the first column type 216 of different support column elements of the same stent auxiliary structure can also be set to be different. In this case, the connection position of the stent auxiliary structure and the tubular stent 100 is in different axial sections, which will have a smaller size in the radial direction and is suitable for a thinner blood vessel inner diameter.

[0077] In other embodiments, the support auxiliary structure can also be two support column elements, the converging end 220 of the two support column elements is a bent end with a return bend; and the two support column elements are located in the same plane (such as Figure 7 As shown, Figure 7 Schematic diagram of a structure of a support auxiliary structure having two support column elements).

[0078] In other embodiments, the support auxiliary structure includes more than three support column elements, and the more than three support column elements are designed as one body, and the first end is a multi-head end, and the second end is a single head end.

[0079] like Figure 8 ( Figure 8 As shown in the schematic diagram of the grid structure in which the free connection end 103 is connected to the middle part of the beam column of the connecting unit grid 141, in other embodiments, the free connection end 103 can also be connected to the beam column of the connecting unit grid 141.

[0080] In order to achieve visualization, the support column elements, connecting components and converging ends described in the embodiments of the present application are each independently selected from non-radiopaque materials.

[0081] The present application also provides a support system, comprising:

[0082] The bracket provided by the above-mentioned embodiment;

[0083] A push wire connected to the proximal end of the stent;

[0084] A catheter is used to deliver the stent.

[0085] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A bracket, characterized in that: The stent comprises a tubular stent body and at least one stent auxiliary structure; The tubular stent body has a central axis, and a section perpendicular to the central axis is defined as an axis-perpendicular section; The support auxiliary structure comprises: At least two support column elements, having a first end, a second end and a convex structure located between the first end and the second end; the first end is connected to the tubular support body; A converging end, where the second ends of the support column elements in the support auxiliary structure converge; The line connecting the first end and the second end of the at least two supporting column elements rotates around the straight line passing through the second end to form a first conical surface, the convex point of the convex structure is located outside the first conical surface, and the straight line passing through the second end is defined as a first conical axis; the first conical axis is colinear with the central axis of the tubular support body.

2. The bracket according to claim 1, characterized in that In the support column element, a first column section is between the first end and the convex structure, and the first column section of the support column element is parallel to the first cone axis.

3. The bracket according to claim 2, characterized in that In the same support auxiliary structure, the lengths of the first column sections of different support column elements are independently selected to be the same or different; Preferably, in the same support auxiliary structure, different supporting column elements have different lengths of the first column sections.

4. The bracket according to claim 1, characterized in that: The convex points of the support column elements in the same support auxiliary structure are all located on the second conical surface, the axis of the second conical surface is colinear with the axis of the first conical surface, and the vertex is the second end; Preferably, the protrusions of the support column elements in the same bracket auxiliary structure are located on the same axial vertical section.

5. The bracket according to claim 1, characterized in that: In the support column element, a second column section is between the convex structure and the second end; the second column sections of different support column elements of the same support auxiliary structure are located on the same second conical surface.

6. The bracket according to claim 1, characterized in that: The included angle between the first column section and the second column section toward the proximal end is an obtuse angle, preferably 100-150°.

7. The bracket according to claim 1, characterized in that: The projections of the support column elements of the same support auxiliary structure onto the axial perpendicular section are arranged radially with the converging end as the center, and the included angles of the projections of the second columnar sections of adjacent support column elements are the same.

8. The bracket according to claim 1, characterized in that: The support auxiliary structure comprises two integrally designed support column elements, and the converging ends of the two support column elements are bent ends with a return bend; Alternatively, the support auxiliary structure includes more than three support column elements, and the more than three support column elements are designed as one body, and the first end is a multi-headed end, and the second end is a single headed end; Alternatively, the support auxiliary structure includes more than three support column elements, and each of the support column elements is independently arranged, and the second end of each support column element is converged at a converging end through a convergence component.

9. The bracket according to claim 1, characterized in that: The support auxiliary structure also includes a connecting component connected to the first end of each support column element, for connecting to the tubular support body; Preferably, the connecting component includes any one of a sleeve component and a clamping component, or a combination of at least two of them.

10. The bracket according to any one of claims 1 to 9, characterized in that: The first column section, the convex structure, the second column section, the connecting component and the converging end are each independently selected from radiopaque materials.

11. The bracket according to claim 1, characterized in that: The stent auxiliary structure is arranged inside and / or at the distal end of the tubular stent body.

12. The bracket according to claim 1, characterized in that The support is provided with two or more support auxiliary structures, and the projections of the support column elements of all the support auxiliary structures on the axial vertical section do not overlap; Preferably, the projection of all the support column elements of the auxiliary structure of the stent on the axial perpendicular section is arranged radially at equal angles with the projection point of the central axis of the tubular stent body as the center.

13. The bracket according to claim 1, characterized in that: The stent is provided with two or more stent auxiliary structures, and the stent auxiliary structures are evenly distributed along the axial direction on the tubular stent main body.

14. The bracket according to claim 11, characterized in that The tubular support body has a hollow grid, and the unit grids of the hollow grid are formed by connecting beams and columns head to tail, and adjacent unit grids include adjacent unit grids sharing a common intersection and adjacent unit grids sharing a common beam and column; The first end of the stent auxiliary structure located inside the tubular stent body is directly or indirectly connected to the intersection of adjacent unit grids that share the common intersection.

15. A support system, characterized in that: The support system comprises: The stent according to any one of claims 1 to 14; A push wire connected to the proximal end of the stent; A catheter is used to deliver the stent.

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