Tubular stent and stent system comprising same

Abstract

The invention relates to a tubular stent and a stent system comprising the same. The tubular stent comprises a hollow cylindrical stent main body, the stent main body is provided with hollow grids, and the stent main body is provided with a stent free end which extends in the axial direction and is integrally designed with the stent main body; the stent free end is positioned between the near end and the far end of the stent main body; the near end of the support auxiliary rod is connected with the free end of the support, and the far end of the support auxiliary rod extends into the support body. According to the tubular stent, the stent free end is arranged, the stent auxiliary rod is arranged at the far end of the stent free end, a functional mechanism is provided for the tubular stent, and meanwhile the stent auxiliary rod is arranged at the free end; the joint of the free end of the stent and the stent auxiliary rod is provided with a space for deforming towards the interior of the tubular stent cavity, so that the conveying resistance cannot be increased due to the arrangement of a functional mechanism, and the risk of injury to blood vessels cannot be increased due to the arrangement of the functional mechanism.

Description

Technical Field

[0001] The invention belongs to the field of vascular stents, and in particular relates to a tubular 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 clinical applications, the visibility (also known as radiopacity) of tubular stents can ensure that clinicians deploy the device in the correct position to achieve medical purposes such as capturing thrombi or dilating blood vessels, so the visibility of the device is crucial. Conventional stents are usually made of nickel-titanium alloy, and their radiopacity is not enough to meet the needs of clinical applications. Therefore, for tubular stents, in order to increase visibility or other functions, radiopaque mechanisms or other functional mechanisms are often set on the tubular stents, and the setting of such mechanisms often affects the smoothness of the outer surface of the tubular stent. For example, if the radiopaque mechanism is set on the stent body of the tubular stent, a bulge is caused compared to the support of the stent body. On the one hand, it increases the resistance of the tubular stent during transportation. On the other hand, the added functional mechanism will also protrude from the support of the stent body in the expanded state, causing damage to the blood vessel wall. Especially for tortuous blood vessels, tubular stents are more likely to cause damage to the blood vessel wall.

[0004] Therefore, how to safely arrange the functional mechanism on the tubular stent to ensure the realization of the corresponding function (such as the development function) and reduce the damage of the tubular stent to the blood vessel wall is a technical problem that needs to be solved in this field. Summary of the invention

[0005] In view of the shortcomings of the prior art, one of the purposes of the present invention is to provide a tubular stent, comprising:

[0006] A hollow cylindrical stent body, the stent body having a hollow grid, the stent body having a stent free end extending in the axial direction and designed integrally with the stent body; the stent free end is located between the proximal end and the distal end of the stent body;

[0007] The stent auxiliary rod has a proximal end connected to the free end of the stent and a distal end extending into the interior of the stent body.

[0008] The tubular stent provided in the present application solves the problems existing in the prior art by setting a stent free end and setting a stent auxiliary rod at the distal end of the stent free end. Specifically, the stent auxiliary rod can be set as a functional mechanism, such as a stent auxiliary rod set as a radiopaque material to provide a development function; the stent free end is connected to the stent auxiliary rod, and the stent auxiliary rod extends to the inside of the stent body, which can limit the stent free end from extending or stretching to the outside of the stent body cavity wall, especially in a curved blood vessel, the stent auxiliary rod can better limit the stent free end from extending outside the tubular stent cavity, thereby avoiding damage to the blood vessel wall; on the other hand, under the joint action of the stent free end and the stent auxiliary rod, the connection position of the stent auxiliary rod and the stent free end has space to deviate toward the inner cavity of the tubular stent. When encountering extrusion, the connection position has space to deviate toward the inner cavity, and this offset space reduces the damage of the tubular stent to the blood vessel wall and reduces the resistance when pushing in the delivery catheter.

[0009] Preferably, the length of the free end of the stent is shorter than the length from the proximal end of the free end of the stent to the distal end of the grid where the free end of the stent is located.

[0010] If the length of the free end of the stent is too long, such as exceeding the length of the far end of the grid where it is located, the connection position between the free end of the stent and the stent auxiliary rod may easily overlap with the support rod of the grid, which will increase the pushing resistance of the tubular stent in the delivery catheter.

[0011] Preferably, the length of the free end of the bracket is less than 1 / 2 of the length from the proximal end of the free end of the bracket to the distal end of the grid where it is located, and preferably the length of the free end of the bracket is less than 1 / 4 of the length from the proximal end of the free end of the bracket to the distal end of the grid where it is located.

[0012] The longer the free end of the tubular support is, the shorter the length of the support auxiliary rod is, and the corresponding functionality (such as imaging) will be reduced.

[0013] In addition, the length of the free end of the stent is preferably greater than or equal to 1 / 10 of the length from the proximal end of the free end of the stent to the distal end of the grid where the free end of the stent is located.

[0014] The shorter the length of the free end of the stent, the smaller the radial deformation of the free end of the stent. After the stent auxiliary rod is connected, the deformation space of the connection position into the tubular stent cavity is smaller, and the connection position is more likely to protrude outside the inner cavity of the tubular stent.

[0015] Preferably, the distal ends of the auxiliary rods of the stent converge, and the convergence point is located on the central axis of the stent body.

[0016] The distal ends of the stent auxiliary rods converge, which can more effectively limit the free ends of the stent within the cavity of the tubular stent, especially when the convergence point is located on the central axis of the stent body, which can better limit all axially distributed free ends of the stent.

[0017] Preferably, the angles between the distal ends of adjacent stent auxiliary rods are the same, and the angles between the distal ends of the stent auxiliary rods and the central axis of the stent body are the same.

[0018] The same angles at the distal ends of the adjacent stent auxiliary rods can better ensure that the stent auxiliary rods are evenly distributed in the circumferential direction, and can better develop the tubular stent. On the other hand, the same angles at the distal ends of the adjacent stent auxiliary rods can make the free ends of the stents located in the same circumferential direction interactively connected through the stent auxiliary rods, better ensuring that the free ends of the stents will not extend outside the tubular stent cavity due to the bending of the stent, and will not cause excessive deformation due to different recovery angles when the stent is recovered.

[0019] Preferably, the angle between the bracket auxiliary rod and the central axis is 30-80°, for example, 42°, 45°, 48°, 53°, 55°, 58°, 64°, 65°, 69°, 73°, 77°, 79°, etc.

[0020] The stent auxiliary rod and the central axis have a certain angle to supplement the radial support force of the tubular stent without affecting the compliance of the tubular stent in the tortuous blood vessel. If the angle is too small, the increase in the radial support force is not obvious. If the angle is too large, the support force on the lumen wall of the tubular stent is too large, which affects the smoothness of the recovery of the tubular stent for the thrombectomy stent. For the intracranial stent, it is easy to cause irritation to the blood vessel wall and increase the risk of complications. The angle between the stent auxiliary rod and the central axis is the angle between the stent auxiliary rod and the central axis extending proximally, with the distal end of the stent auxiliary rod as the angular vertex.

[0021] Preferably, the support auxiliary rod has a bend, and the bend makes the distal end of the support auxiliary rod extend toward the central axis.

[0022] The stent auxiliary rod is configured to have a curved structure, which can improve the firmness of the distal end convergence of the stent auxiliary rod and improve the supplement of the radial supporting force of the tubular stent. The curvature of the stent auxiliary rod can be achieved by pre-forming.

[0023] As an optional specific implementation, the support auxiliary rod includes a parallel section parallel to the central axis, and an inclined section with a distal end close to the central axis.

[0024] Preferably, the connection between the bracket auxiliary rod and the free end is a rigid connection or a flexible connection.

[0025] Further preferably, the connection method between the bracket auxiliary rod and the free end of the bracket includes any one of fixed sleeve connection, welding, bonding or clamping, or a combination of at least two of them.

[0026] As an optional specific embodiment, the stent auxiliary rods converging together at the distal end are defined as stent auxiliary units, and along the axial direction of the stent body, the number of the stent auxiliary units is greater than or equal to 1, and the stent auxiliary units are arranged near the point where the distance between the proximal end and the distal end of the stent body is equally divided.

[0027] That is, the bracket auxiliary units described in the present application are evenly distributed along the axial direction. This arrangement can provide better radial support for the tubular bracket body. When the bracket auxiliary rod has a developing performance, it can also better develop the tubular bracket in sections, better locate the position of the tubular bracket, and determine the direction of the tubular bracket.

[0028] Preferably, at the distal end of the free end of the stent, a cross section perpendicular to the axial direction has a circumferential length greater than a length perpendicular to the axial direction.

[0029] The distal cross section of the free end of the stent described in the present application is set to be flat, and the circumferential length of the cross section along the tubular stent is greater than the radial length of the tubular stent. This setting is more conducive to connection with the stent auxiliary rod.

[0030] Preferably, the proximal end of the free end of the stent is located at the grid intersection of the hollow grid.

[0031] The hollow grid described in the present application is formed by connecting the pillars end to end, and more than three pillars in the middle of the stent body converge at the grid intersection; the proximal end of the free end of the stent is arranged at the grid intersection, and the grid intersection with the proximal end of the free end of the stent is the free end intersection.

[0032] In a preferred embodiment, the free end intersection only converges three of the pillars.

[0033] Preferably, the distal ends of the stent auxiliary rods converge, and a radiopaque mechanism is provided at the convergence point, preferably a radiopaque ring or a radiopaque coil.

[0034] Preferably, a radiopaque device is provided at the distal end of the stent body.

[0035] The second object of the present application is to provide a bracket system, characterized in that the bracket system comprises:

[0036] The tubular stent as described in one of the purposes;

[0037] A push wire connected to the proximal end of the tubular stent;

[0038] A catheter is used to deliver the tubular stent.

[0039] Compared with the prior art, this application has the following beneficial effects:

[0040] The tubular stent provided in the present application provides a functional mechanism for the tubular stent by setting a stent free end and setting a stent auxiliary rod at the distal end of the stent free end. At the same time, by setting the free end and the stent auxiliary rod, the connection between the stent free end and the stent auxiliary rod has space to deform into the tubular stent cavity, and the delivery resistance will not be increased due to the setting of the functional mechanism, nor will the risk of damage to the blood vessel be increased due to the setting of the functional mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 A schematic diagram of the flattening and unfolding of the tubular stent provided in Example 1;

[0042] Figure 2 A schematic diagram of the three-dimensional structure of the tubular support provided in Example 1;

[0043] Figure 3 for Figure 1 A schematic diagram of the enlarged structure within the dashed box;

[0044] Figure 4 A schematic diagram of the three-dimensional structure of the stent auxiliary rod 200 of the tubular stent provided in Example 1;

[0045] Figure 5 A schematic diagram of the structure of a right side view of a stent auxiliary rod 200 of a tubular stent provided in Example 1;

[0046] Figure 6 A schematic diagram of the cross-sectional structure of the free end of the tubular stent at the connection point provided in Example 1;

[0047] Figure 7 A schematic diagram of the flattening and unfolding of the tubular stent provided in Example 2;

[0048] Figure 8 A schematic diagram of the flattening and unfolding of the tubular stent provided in Example 3;

[0049] Fig. 9 A schematic structural diagram of a stent auxiliary unit 200 of a tubular stent provided in Example 3 from a distal perspective;

[0050] Fig.10 This is a schematic diagram of the structure of the tubular support provided in Example 4. DETAILED DESCRIPTION

[0051] The technical solution of the present invention is further explained below in conjunction with specific implementation methods. However, it should be noted that the specific implementation methods are 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.

[0052] The present application 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 relevant invention, rather than to limit the invention. It should also be noted that, for ease of description, only the parts related to the relevant invention are shown in the accompanying drawings.

[0053] In the description of this 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, the length direction of the guide wire or the length direction of the stent, and the "radial" should be understood as the perpendicular direction of the "axial".

[0054] 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.

[0055] Example 1

[0056] like Figures 1 to 4 ( Figure 1 This is a schematic diagram of the flattening and unfolding of the tubular stent provided in Example 1, Figure 2 This is a schematic diagram of the three-dimensional structure of the tubular support provided in Example 1. Figure 3 for Figure 1 The enlarged structural diagram in the dotted box. Figure 4 This is a schematic diagram of the three-dimensional structure of the stent auxiliary rod 200 of the tubular stent provided in Example 1. Figure 5 This is a schematic diagram of the right side structure of the stent auxiliary rod 200 of the tubular stent provided in Example 1. Figure 6 As shown in the schematic diagram of the cross-sectional structure of the free end of the tubular stent at the connection of the tubular stent provided in Example 1, Example 1 provides a tubular stent, comprising:

[0057] The hollow cylindrical stent body 100 is divided into a proximal portion (10), a middle portion 20 and a distal portion (30) along the axial direction. The stent body has a hollow grid, and the hollow grid has a plurality of arranged hollow structures 110. Each hollow structure is surrounded by at least 4 (such as 4, 5, 6) pillars 111 connected end to end. The ends of the pillars 111 intersect at an intersection. In the middle portion 20 of the stent body, a stent free end 120 is selectively set at the intersection. The stent self-supporting structure 110 is provided. The intersection of the end 120 is the second intersection 113, and the intersection without the bracket free end 120 is the first intersection 112; the second intersection 113 only intersects with three pillars 111; a third intersection 114 is set in the same hollow structure 110 as the second intersection 113, and the third intersection 114 only intersects with three pillars 111, and there are two intersections between the third intersection 114 and the second intersection 113; the bracket free end 120 is integrally carved with the bracket body (i.e., integral design). A group of bracket free end sets are set in the middle part 20 of the bracket body 100, and the bracket free end set is set with three bracket free ends 120.

[0058] The length of the free end 120 of the bracket is A, and the distance between the free end 120 of the bracket and the farthest intersection of the hollow structure 110 is B. A and B satisfy that A is less than or equal to 1 / 2B, preferably less than or equal to 1 / 4B; preferably, A and B also satisfy that A is greater than or equal to 1 / 10B.

[0059] The tubular stent also includes a stent auxiliary unit 200, and the stent auxiliary unit 200 is provided with three stent auxiliary rods 210, and the proximal ends of the three stent auxiliary rods 210 are respectively connected to the three stent free ends 120 in the stent free end set, and the distal ends of the three stent auxiliary rods 210 intersect at a convergence point 220, and the convergence point 220 is located at the central axis 300 of the tubular stent body. The stent auxiliary rod 210 includes a proximal parallel section 211 and a distal inclined section 212, and the larger the angle between the proximal parallel section 211 and the distal inclined section 212, the smaller the angle α between the distal end of the stent auxiliary rod 210 (i.e., the inclined section 212) and the central axis 300 of the stent body. The angle α in Example 1 is 66°. The distal ends of the three stent auxiliary rods 210 in the stent auxiliary unit 200 have the same angle with the central axis 300 of the stent body.

[0060] Only one stent auxiliary unit 200 is set along the length direction of the tubular stent, and the proximal ends of the three stent free ends 120 connected to the three stent auxiliary rods 210 of the stent auxiliary unit 200 can be located in the same circumferential direction or different circumferential directions, the proximal ends of the stent auxiliary rods 210 of the same stent auxiliary unit 200 can be located in the same circumferential direction or different circumferential directions, and the intersection of the proximal parallel section 211 and the distal inclined section 212 of the stent auxiliary rod of the same stent auxiliary unit 200 is located in the same circumferential direction.

[0061] Among the three stent auxiliary rods 210 in the stent auxiliary unit 200, the distal ends of two adjacent stent auxiliary rods 210 have the same angle. In Example 1, the angles β1, β2, and β3 of the distal ends of the stent auxiliary rods 210 projected in a cross section perpendicular to the central axis 300 of the tubular stent body are all about 120°.

[0062] In other embodiments, the angle α between the distal end of the stent auxiliary rod and the central axis 300 of the stent body may also be 43°, 50°, 55°, etc.

[0063] The connection method of the connection point 130 between the proximal end of the stent auxiliary rod 210 and the stent free end 120 is a rigid fixed connection. For example, the proximal end of the stent auxiliary rod 210 is fixed to the distal end of the stent free end 120 by sleeve-fitting a fixed metal ring 131 and then filling an adhesive material 132.

[0064] In a preferred technical solution, the cross-section of the distal end of the stent auxiliary rod 210 is rectangular, and its circumferential length L1 is greater than its length L2 perpendicular to the axial direction.

[0065] In other embodiments, the connection method of the connection point 130 between the proximal end of the stent auxiliary rod 210 and the stent free end 120 may also be welding, clamping or direct bonding.

[0066] The material of the stent auxiliary unit 200 is all radiopaque material. In other specific embodiments, the stent auxiliary rod 210 or the convergence point 220 of the stent auxiliary unit 200 can be arbitrarily all or partly or not selected as radiopaque material, preferably, there is a mechanism in the stent auxiliary rod 210 or the convergence point 220 that is radiopaque material. In other specific embodiments, the radiopaque material can also be set on the stent auxiliary unit by attachment, and the attachment method is exemplified by C-ring clamping, winding, etc.

[0067] It should be noted that the angles and angles described in this application are the same as long as the processing accuracy allows, that is, the errors caused by the processing accuracy are allowed.

[0068] Example 2

[0069] like Figure 7 ( Figure 7 As shown in the schematic diagram of the flattening and unfolding of the tubular stent provided in Example 2, Example 2 provides a tubular stent, comprising:

[0070] The hollow cylindrical stent body 100 is divided into a proximal portion ( Figure 7 not shown), the middle portion 20 and the distal portion ( Figure 7 (not shown), the bracket body has a hollow grid, the hollow grid has a plurality of arranged hollow structures 110, each hollow structure is surrounded by at least 4 (such as 4, 5, 6) pillars 111 connected end to end, the ends of the pillars 111 intersect at the intersection, in the middle part 20 of the bracket body, the intersections are all intersected by the ends of 4 pillars 111, and the bracket free end 120 is selectively set at the intersection; the intersection where the bracket free end 120 is set is the fourth intersection 115, and the intersection where the bracket free end 120 is not set is the first intersection 112; the bracket free end 120 is carved integrally with the bracket body (i.e., integral design). At least 3 bracket free ends 120 are set in the middle part 20 of the bracket body 100.

[0071] The tubular stent further includes a stent auxiliary unit 200 , and the configuration of the stent auxiliary unit 200 is the same as that of the first embodiment.

[0072] Example 3

[0073] like Figure 8-Figure 9 ( Figure 8 This is a schematic diagram of the flattening and unfolding of the tubular stent provided in Example 3. Fig. 9 As shown in the structural schematic diagram of the stent auxiliary unit 200 of the tubular stent provided in Example 3 from a distal perspective, Example 3 provides a tubular stent, including:

[0074] The hollow cylindrical stent body 100 is divided into a proximal portion ( Figure 8 not shown), the middle portion 20 and the distal portion ( Figure 8 The support body 100 has a hollow grid, and the hollow grid has a plurality of arranged hollow structures 110. Each hollow structure is formed by at least four (e.g., four, five, or six) pillars 111 connected end to end. The pillars 111 are at least partially provided with a support free end 120. The support free end 120 is integrally carved with the support body (i.e., integrally designed). At least four support free ends 120 are provided in the middle portion 20 of the support body 100.

[0075] The tubular stent also includes a stent auxiliary unit 200, and the stent auxiliary unit 200 is provided with four stent auxiliary rods 210, and the proximal ends of the four stent auxiliary rods 210 are respectively connected to the four stent free ends 120, and the distal ends of the four stent auxiliary rods 210 intersect at a convergence point 220, and the convergence point 220 is located at the central axis 300 of the tubular stent body. The stent auxiliary rod 210 includes a proximal parallel section 211 and a distal inclined section 212. In Example 3, the angle α between the distal end of the stent auxiliary rod 210 and the central axis 300 of the stent body is 50°. The angles between the distal ends of the four stent auxiliary rods 210 in the stent auxiliary unit 200 and the central axis 300 of the stent body are all the same.

[0076] Only one stent auxiliary unit 200 is set along the length direction of the tubular stent, and the proximal ends of the four stent free ends 120 connected to the four stent auxiliary rods 210 of the stent auxiliary unit 200 can be located in the same circumferential direction or different circumferential directions, the proximal ends of the stent auxiliary rods 210 of the same stent auxiliary unit 200 can be located in the same circumferential direction or different circumferential directions, and the intersection of the proximal parallel section 211 and the distal inclined section 212 of the stent auxiliary rod of the same stent auxiliary unit 200 is located in the same circumferential direction.

[0077] The distal ends of two adjacent stent auxiliary rods 210 of the four stent auxiliary rods 210 in the stent auxiliary unit 200 have the same angle. In Example 3, the distal ends of the stent auxiliary rods 210 have an angle of about 90° in the cross-sectional projection perpendicular to the central axis 300 of the tubular stent body.

[0078] In other specific embodiments, the number of stent auxiliary rods 210 in a stent auxiliary unit 200 is n, n≥2, n is an integer, and can be 3, 4, 5, 6, 7, 8, etc. The angles between the distal ends of the n stent auxiliary rods 210 in the stent auxiliary unit 200 and the central axis 300 of the stent body are the same, and the angles of the projections of the distal ends of the stent auxiliary rods 210 on the cross-section perpendicular to the central axis 300 of the tubular stent body are all about 360° / n.

[0079] Example 4

[0080] like Fig.10 ( Fig.10 As shown in the structural schematic diagram of the tubular bracket provided in Example 4, Example 4 provides a tubular bracket having a hollow cylindrical main body 100 with the same structure as Example 1, except that the middle part 20 of the bracket main body 100 is provided with two groups of bracket free end sets, a first bracket free end set 141 and a second bracket free end set 142, and each of the bracket free end sets is independently provided with three bracket free ends 120.

[0081] The tubular support also includes two support auxiliary units, a first support auxiliary unit 201 and a second support auxiliary unit 202. The structure of each of the support auxiliary units is the same as that in Example 1, and the only difference is that the connection method between the first support auxiliary unit 201 and the second support auxiliary unit 202 and the support body has been adaptively adjusted. Specifically, the first support free end set 141 is connected to the first support auxiliary unit 201, and the second support free end set 142 is connected to the second support auxiliary unit 202. The specific connection method is the same as that in Example 1.

[0082] In Example 4, the first stent auxiliary unit 201 and the second stent auxiliary unit 202 are arranged along the axial direction of the stent body near the points where 1 / 3 and 2 / 3 of the distance between the proximal end and the distal end of the stent body are equally divided.

[0083] It should be noted that Fig.10 Only two support auxiliary rods 210 can be seen in the middle support auxiliary unit. This is because Fig.10 The problem of viewing angle is that one of the support auxiliary rods 210 is blocked and cannot be shown from the view.

[0084] A specific embodiment of the present application also provides a support system, including:

[0085] A tubular stent as described in any one of the preceding embodiments 1 to 3;

[0086] A push wire fixedly connected to the proximal end of the tubular stent;

[0087] and a catheter for delivering the tubular stent.

[0088] 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 tubular stent, characterized in that: The tubular support comprises: A hollow cylindrical stent body, the stent body having a hollow grid, the stent body having a stent free end extending in the axial direction and designed integrally with the stent body; the stent free end is located between the proximal end and the distal end of the stent body; The stent auxiliary rod has a proximal end connected to the free end of the stent and a distal end extending into the interior of the stent body.

2. The tubular stent according to claim 1, characterized in that: The length of the free end of the bracket is shorter than the length from the proximal end of the free end of the bracket to the distal end of the grid where the free end of the bracket is located.

3. The tubular stent according to claim 1, characterized in that: The length of the free end of the bracket is less than 1 / 4 of the length from the proximal end of the free end of the bracket to the distal end of the grid where the free end of the bracket is located.

4. The tubular stent according to claim 1, characterized in that: The distal ends of the auxiliary rods of the support are converged, and the convergence point is located on the central axis of the support body.

5. The tubular stent according to claim 1, characterized in that: The included angles of the distal ends of the adjacent support auxiliary rods are the same, and the included angles of the distal ends of the support auxiliary rods and the central axis of the support body are the same.

6. The tubular stent according to claim 1, characterized in that: The angle between the distal end of the auxiliary rod of the support and the central axis is 30 to 80 degrees.

7. The tubular stent according to claim 1, characterized in that: The support auxiliary rod has a curved shape, and the curved shape enables the distal end of the support auxiliary rod to extend toward the central axis.

8. The tubular stent according to claim 7, characterized in that: The support auxiliary rod comprises a parallel section parallel to the central axis and an inclined section with a distal end close to the central axis.

9. The tubular stent according to claim 1, characterized in that: The connection between the bracket auxiliary rod and the free end of the bracket is a rigid connection or a flexible connection.

10. The tubular stent according to claim 1, characterized in that: The connection method between the bracket auxiliary rod and the free end of the bracket includes any one of fixed sleeve connection, welding, bonding or clamping, or a combination of at least two of them.

11. The tubular stent according to claim 1, characterized in that: The stent auxiliary rods converging together at the distal end are defined as stent auxiliary units. Along the axial direction of the stent body, the number of the stent auxiliary units is greater than or equal to 1, and the stent auxiliary units are arranged near the equal-division point of the distance between the proximal end and the distal end of the stent body.

12. The tubular stent according to claim 1, wherein: The distal end of the free end of the stent has a cross section perpendicular to the axial direction with a circumferential length greater than a length perpendicular to the axial direction.

13. The tubular stent according to claim 1, characterized in that: The proximal end of the free end of the stent is located at the grid intersection of the hollow grid.

14. The tubular stent according to claim 1, characterized in that: The distal ends of the stent auxiliary rods converge, and a radiopaque mechanism is provided at the convergence point, preferably a radiopaque ring or a radiopaque coil.

15. The tubular stent according to claim 1, characterized in that: A radiopaque device is disposed at the distal end of the stent body.

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

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