Developing mark attachment mechanism and intravascular stent

Abstract

The invention relates to an attachment structure of a developing mark, which comprises a developing part, a mounting part and a connecting rod, the mounting part is connected to one stent rod of an intravascular stent through the connecting rod, the mounting part is of a sheet-shaped hollow structure, the developing part is fixed on the mounting part in a sleeving manner, and the position, corresponding to the hollow structure, of a developing ring is inwards sunken into the hollow structure; and a preset bulge is arranged on the same side of the concave position on the developing ring. The size of the hollowed-out structure on the mounting part is limited, so that the hollowed-out structure only occupies part of the mounting part, the non-sunken part on the same side of the developing part is relatively bulged to form a preset bulge when the sunken part is processed, and compared with a scheme that the sunken surface of the developing ring is completely riveted into the hollowed-out structure of the mounting part, the preset bulge is arranged on the sunken side of the developing part, so that the sunken surface of the developing ring is completely riveted into the hollow-out structure of the mounting part. The effect of grabbing thrombus at local points on the stent is more three-dimensional. The attachment structure of the developing mark inclines towards the axial center, so that the attachment mechanism and the stent main body form three-dimensional thrombus grabbing and blocking effects.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to an attachment structure of a development marker and a vascular stent. Background Art

[0002] Ischemic stroke is characterized by high morbidity, high mortality, high disability rate, and high recurrence rate. After an ischemic stroke occurs, the blood vessels must be recanalized in the shortest possible time. There are two main treatment methods for intracranial thrombosis: drug thrombolysis and mechanical thrombectomy. Drug thrombolysis is a drug treatment method that mainly includes antiplatelet therapy and anticoagulant therapy. The antiplatelet drugs available include aspirin, clopidogrel, etc., and oral warfarin anticoagulant therapy is recommended for anticoagulant therapy. Thrombolytic therapy is only suitable for smaller thrombi, and the treatment effect on large thromboembolism is not ideal; some patients have allergic reactions to thrombolytic drugs and are not suitable for thrombolytic therapy. Mechanical thrombectomy is divided into two categories: stent thrombectomy and direct thrombectomy. Stent thrombectomy approaches the thrombus through a microcatheter, and then introduces a stent thrombectomy device through the microcatheter for thrombectomy. Direct thrombectomy uses the principle of negative pressure suction to reach the proximal end of the blood vessel occluded by the thrombus through the suction catheter or reperfusion catheter to suck out the thrombus. At present, stent thrombectomy is the most common thrombectomy method for mechanical thrombectomy.

[0003] Stent thrombectomy uses microcatheter technology to pass the stent thrombectomy device along the lower limb artery through the arterial channel in the body to the intracranial artery. The thrombectomy device at the front of the catheter actively "captures" the blood clots blocking the blood vessels and restores vascular patency. Compared with drug thrombolysis, mechanical thrombectomy has obvious advantages. The interventional thrombectomy time window is long and can quickly restore canalization. It is suitable for patients who are intolerant to drug thrombolysis. The existing mechanical thrombectomy structure has certain defects, such as general imaging effect, complex structure, inconvenient installation, and large investment in installation equipment.

[0004] In the existing patent CN111329556B, the developing ring in the middle of the stent is installed on the arch-shaped marker mounting protrusion. This design has a simple structure and can develop the middle part of the stent. During surgery, multiple groups of developing points in the middle run through the entire stent to provide doctors with judgment of the working length and position of the stent and the state of the stent after opening. The clinical effect of this design has been proven to be excellent. However, the connection between the arch-shaped marker mounting protrusion and the developing ring of this design is laser welding, which requires the investment of laser welding equipment. This equipment is relatively expensive. How to reduce costs and achieve a medical solution with similar functions to patent CN111329556B or even better developing effects is a problem that this application wants to overcome and solve. Summary of the invention

[0005] In view of this, the present application proposes an attachment structure of a developing mark, comprising a developing part, a mounting part and a connecting rod; the mounting part is suitable for being connected to one of the stent rods of a vascular stent, the mounting part is in a sheet-like structure, one end of the mounting part is installed with the connecting rod extending outward, the connecting rod is suitable for being installed to the stent rod, and a hollow structure is provided on the mounting part, the area of ​​the hollow structure accounts for 30%-70% of the total area of ​​the mounting part; the developing part is sleeved and fixed on the mounting part, and the developing ring is recessed inwardly into the hollow structure at the position corresponding to the hollow structure, and a preset protrusion is provided on the same end surface of the recessed position on the developing ring.

[0006] In a possible implementation, a hollow structure is provided in the middle of the mounting portion, and the ratio of the length of the hollow structure in the direction of the bracket rod to the length of the mounting portion on the bracket rod is less than 1 / 3; the developing portion has symmetrical preset protrusions on both sides of the hollow structure.

[0007] In a possible implementation, two to three hollow structures are arranged on the mounting portion along the direction of the bracket rod, and the preset protrusion is provided between two adjacent depressions of the developing portion.

[0008] In a possible implementation, the end surface opposite to the recessed side of the developing portion is a flat surface.

[0009] In a possible implementation, a first limiting boss is disposed on the mounting portion, the first limiting boss is disposed at a position where the mounting portion is connected to the connecting rod, and the first limiting boss is in contact with the developing ring.

[0010] In one possible implementation, the mounting portion is in the form of a rectangular sheet structure, and the connecting rod extends obliquely outward from one end corner of the mounting portion in the length direction; the hollow structure is in the form of a square groove, and the corners of the hollow structure are rounded, and the rounded corners adjacent to the connecting rod are larger; the edge of the hollow structure adjacent to one side of the connecting rod remains flush with the bottom of the first limiting boss.

[0011] In a possible implementation, the mounting portion has a rectangular structure, a second limiting boss is slightly extended outward from the remaining corners of the mounting portion not connected to the connecting rod, and the end of the mounting portion not connected to the connecting rod has a convex arc structure.

[0012] On the other hand, the present application provides a vascular stent, comprising a stent body and an attachment structure for a developing mark as described in any possible implementation method; the stent body is a cylindrical structure with a hollow interior, and the side wall of the stent body is a grid structure composed of several stent rods; the number of the attachment structures for the developing mark is multiple, and they are installed in the middle part of the vascular stent; specifically, the attachment structure for the developing mark is installed on the side of one of the stent rods, the connecting rod has a first preset angle with the stent rod, and the preset angle range is 30°-75°.

[0013] In a possible implementation, the developing mark attachment structure is bent toward the central axis direction of the bracket body; wherein, the angle between the developing mark attachment structure and its tangent at that position of the bracket body is a second preset angle; and the range of the second preset angle is 10°-45°.

[0014] In a possible implementation, the recessed end surface of the developing portion faces the inner side of the bracket body; the developing marks arranged adjacent to the bracket body in the circumferential direction together constitute a developing segment, and the developing segment is linearly arranged on the side wall of the bracket body or the developing segment is spirally arranged on the side wall of the bracket body.

[0015] The beneficial effects of the present application are as follows: the developing part is fixed to the hollow structure of the mounting part through the concave structure, and the hollow structure occupies 30%-70% of the total area of ​​the mounting part, so as to form a preset protrusion on the same end face of the recessed position of the developing part. Simply put, the size of the hollow structure opened on the mounting part is limited so that the hollow structure only occupies a part of the mounting part. When processing the recess, the non-recessed part of the same end face of the developing part will further bulge to form the preset protrusion mentioned above. Compared with the solution of completely riveting the recessed surface of the developing ring into the hollow structure of the mounting part, the developing part has a preset protrusion on the same end face of the recess, which can achieve a more three-dimensional development effect of the local point on the bracket.

[0016] Moreover, the developing part with preset protrusions has a better thrombus-catching effect than the developing ring with a smooth surface during the operation of capturing thrombus with the stent, making it easier for the operator to complete the treatment of thrombus in the blood vessel.

[0017] Furthermore, an unprocessed developing ring is directly mounted on the mounting portion. Although the developing ring without riveting treatment has a more three-dimensional developing effect, nearly half of the diameter of the developing ring exceeds the cylindrical surface of the stent. When the stent is fully opened in the blood vessel, the scratches on the blood vessel wall will be more serious. In other words, in this solution, only a part of the developing portion is riveted, and a preset protrusion higher than the original diameter of the developing ring will be formed around the riveting position of the developing portion, which can reduce the negative impact caused by scratching the blood vessel wall when the stent is fully opened, and can ensure that the developing effect of this local point is more three-dimensional as much as possible.

[0018] Other features and aspects of the present application will become apparent from the following detailed description of exemplary embodiments with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments, features, and aspects of the present application and, together with the description, serve to explain the principles of the present application.

[0020] Figure 1 A three-dimensional structural diagram showing the attachment structure of the development mark of the first embodiment of the present application;

[0021] Figure 2 A three-dimensional structural diagram showing the attachment structure of the development mark of the first embodiment of the present application from another angle;

[0022] Figure 3 A three-dimensional structural diagram of the mounting portion of the first embodiment of the present application is shown;

[0023] Figure 4 A three-dimensional structural diagram showing the attachment structure of the development mark of the second embodiment of the present application;

[0024] Figure 5 A three-dimensional structural diagram showing the attachment structure of the development mark from another angle of the second embodiment of the present application;

[0025] Figure 6 A three-dimensional structural diagram of the mounting portion of the second embodiment of the present application is shown;

[0026] Figure 7 A front view showing the attachment structure of the development mark of the first embodiment of the present application;

[0027] Figure 8 for Figure 7 Cross-sectional view of the middle BB section;

[0028] Fig. 9 A partial enlarged view of the mounting portion of the first embodiment of the present application is shown;

[0029] Fig.10 A partial structural diagram of the vascular stent of the present application is shown;

[0030] Fig.11 A partial structural diagram of a vascular stent according to another embodiment of the present application is shown;

[0031] Fig.12 An axial view of the natural state of the vascular stent of the present application is shown;

[0032] Fig.13 An axial view showing a curled state of the vascular stent of the present application;

[0033] Fig.14 This is a schematic diagram of a riveting tool that rivets the developing part into the hollow structure;

[0034] Fig.15 A three-dimensional structural diagram of a support structure according to one embodiment of the present application is shown. DETAILED DESCRIPTION

[0035] Various exemplary embodiments, features and aspects of the present application will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0036] Among them, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application or simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0037] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0038] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0039] In addition, in order to better illustrate the present application, numerous specific details are given in the following specific embodiments. It should be understood by those skilled in the art that the present application can also be implemented without certain specific details. In some examples, methods, means, components and circuits well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present application.

[0040] like Figure 1-Figure 15 As shown, the attachment structure of the developing mark includes: a developing part 2, a mounting part 1 and a connecting rod 3, the mounting part 1 is suitable for connecting to one of the stent rods 41 of the vascular stent, the mounting part 1 is a sheet structure, one end of the mounting part 1 is installed with a connecting rod 3 extending outward, the connecting rod 3 is suitable for being installed to the stent rod 41, and a hollow structure 11 is opened on the mounting part 1, the area of ​​the hollow structure 11 accounts for 30%-70% of the total area of ​​the mounting part 1, the developing part 2 is sleeved and fixed on the mounting part 1, and the developing ring is recessed 21 inwardly into the hollow structure 11 at the position corresponding to the hollow structure 11, and a preset protrusion 22 is provided in the same end surface of the recessed position on the developing ring.

[0041] In this embodiment, the developing part 2 is fixed to the hollow structure 11 of the mounting part 1 through the concave structure, and the hollow structure 11 occupies 30%-70% of the total area of ​​the mounting part 1, so as to form a preset protrusion 22 on the same end face of the indented position of the developing part 2. Simply put, the size of the hollow structure 11 on the mounting part 1 is limited so that the hollow structure 11 only occupies a part of the mounting part 1. When the indentation 21 is processed, the same end face of the developing part 2 without the indentation 21 will further bulge to form the preset protrusion 22 mentioned above. Compared with the scheme of completely riveting the indented surface of the developing ring into the hollow structure 11 of the mounting part 1, the developing part 2 has a preset protrusion 22 on the same indented end face, which can achieve a more three-dimensional development effect of a local point on the bracket.

[0042] Moreover, the developing portion 2 with the preset protrusion 22 has a better thrombus-catching effect than the developing ring with a smooth surface during the operation of capturing thrombus by the stent, and it is easier for the operator to complete the treatment of thrombus in the blood vessel.

[0043] Furthermore, an unprocessed developing ring is directly mounted on the mounting portion 1. Although the developing ring that has not been riveted has a more three-dimensional developing effect, nearly half of the diameter of the developing ring exceeds the cylindrical surface of the stent. When the stent is fully opened in the blood vessel, the scratches on the blood vessel wall will be more serious. In other words, in this solution, only a part of the developing portion 2 is riveted, and a preset protrusion 22 higher than the original diameter of the developing ring will be formed around the riveted position of the developing portion 2, which can reduce the negative impact caused by the scratches on the blood vessel wall when the stent is fully opened, and can ensure that the developing effect of the local point is more three-dimensional as much as possible. In addition, the riveted connection method has high connection stability and high connection strength, and does not require the use of a laser welding machine for welding, saving equipment investment costs.

[0044] like Figure 4-Figure 6 As shown, in one specific embodiment, a hollow structure 11 is opened in the middle of the mounting portion 1, and the ratio of the length of the hollow structure 11 in the direction of the bracket rod 41 to the length of the mounting portion 1 in the bracket rod 41 is less than 1 / 3, and the developing portion 2 has symmetrical preset protrusions 22 on both sides of the hollow structure 11.

[0045] like Figure 1-Figure 3 As shown, in one of the specific embodiments, 2 to 3 hollow structures 11 are arranged on the mounting portion 1 along the direction of the bracket rod 41 , and a preset protrusion 22 is provided between two adjacent recesses 21 of the developing portion 2 .

[0046] like Figure 2 , Figure 5 As shown, in one of the specific embodiments, the end surface opposite to the recess 21 of the developing portion 2 is a flat surface 14 .

[0047] In this embodiment, preferably, the flat surface 14 of the developing portion 2 faces outward, that is, the side of the developing portion 2 with the depression 21 faces the center of the stent. Simply put, the side of the developing portion 2 with the depression 21 is the inner side of the stent, and the side of the developing ring that is not squeezed is the outer side of the stent cylinder. Its clinical advantage is that the outer side is smoother, and the height protruding from the stent cylinder is only the thickness of the developing ring. During the thrombus removal process, the outer side of the developing ring of the stent contacts the blood vessel wall, which can reduce the scratching of the blood vessel wall.

[0048] Furthermore, Fig.14 The diagram is a schematic diagram of the developing part 2 being riveted into the groove. First, the developing part 2 is inserted into the developing mark attachment structure of the bracket so that the first limiting boss 12 contacts one end of the developing ring, and then the developing part 2 is pressed down by aligning the middle position of the hollow structure 11 with the riveting tool 5. Since the developing part 2 is made of a radiopaque precious metal or alloy and is relatively soft, it can be embedded in the recess 21 under the pressure of the riveting tool 5, so that the developing part 2 is firmly connected to the developing mark attachment mechanism of the bracket.

[0049] In one specific embodiment, the mounting portion 1 is a rectangular sheet structure, the connecting rod 3 extends obliquely outward from one end corner of the mounting portion 1 in the length direction, and the angle between the connecting rod 3 and the bracket rod at the connecting position is usually an acute angle.

[0050] like Fig. 9 As shown, in one of the specific embodiments, a first limiting boss 12 is provided on the mounting portion 1, and the first limiting boss 12 is provided at the position where the mounting portion 1 is connected to the connecting rod 3, and the first limiting boss 12 is in contact with the developing ring.

[0051] In one specific embodiment, the hollow structure 11 is a square groove, and the corners of the hollow structure 11 are rounded, and the rounded corners adjacent to the connecting rod 3 are larger. The edge of the hollow structure 11 adjacent to the connecting rod 3 is flush with the bottom of the first limiting boss 12.

[0052] like Figure 6 As shown, in one specific embodiment, the mounting portion 1 is a rectangular structure, and a second limiting boss 13 is slightly extended outward from the remaining corners of the mounting portion 1 that are not connected to the connecting rod 3, and the end of the mounting portion 1 that is not connected to the connecting rod 3 is a convex arc structure.

[0053] On the other hand, Figure 10-13 As shown, a vascular stent includes a stent body 4 and the above-mentioned developing mark attachment structure, the stent body 4 is an internally hollow column structure, and the side wall of the stent body 4 is a grid structure composed of several stent rods 41, the number of the developing mark attachment structure is multiple, and it is installed in the middle of the vascular stent. Specifically, the developing mark attachment structure is installed on the side of one of the stent rods 41, the connecting rod 3 and the stent rod 41 have a first preset angle, and the first preset angle range is 30°-75°, and the developing mark attachment structure is bent toward the central axis direction of the stent body 4.

[0054] like Fig.11 As shown, in one specific embodiment, the developing mark attachment structure is bent toward the central axis direction of the bracket body 4, wherein the angle between the developing mark attachment structure and its tangent at that position of the bracket body 4 is a second preset angle α, and the range of the second preset angle α is 10°-45°.

[0055] In one specific embodiment, the end face of the recess 21 of the developing portion 2 faces the inner side of the bracket body 4, and the developing marks arranged adjacent to each other in the circumferential direction of the bracket body 4 together constitute a developing segment, and the developing segments are linearly arranged on the side wall of the bracket body 4 or the developing segments are spirally arranged on the side wall of the bracket body 4.

[0056] Fig.15It is shown that the developing mark is located on the stent rod 41 in the middle section of the stent. Three developing marks at adjacent rod positions in the same direction form a group. There are multiple groups of developing structures according to the length of the stent. The developing structure is used to place and connect the developing ring to mark the position of the stent during the operation and to indicate the opening state of the stent after the stent is pushed out of the microcatheter.

[0057] Fig. 9 This is a partial enlarged view of one of the attachment mechanisms with a developer mark in the present application. The structure is connected by a connecting rod 3 and a bracket rod 41. There is a first limiting boss 12 near the connecting rod, which is used to limit the position of the developer ring in the developer mark attachment mechanism. According to the size, number and position distribution of the hollow structure 11 on the developer mark attachment mechanism, the developer mark attachment mechanism has a variety of designs, such as Figure 1 , Figure 4 As shown, Figure 1 It is a hollow rectangular short groove located in the middle of the developing mark attachment mechanism; Figure 4 There are two hollow rectangular short grooves located at both ends of the developing mark attachment mechanism. The purpose of the hollow structure 11 is to deform the developing ring and embed it into the hollow structure 11 when the developing ring is squeezed, thereby realizing the riveting of the developing ring and the developing mark attachment mechanism.

[0058] In addition, there is a better design, such as Figure 11-13 As shown, after the bracket is cut, a pressure is applied radially to the developing component mounting structure during the heat treatment process, and the developing mounting component is molded by a tooling die so that the developing mounting component and the bracket rod body form an angle α. Finally, the developing ring is riveted into the hollow structure 11 of the mounting portion 1 through the aforementioned riveting method.

[0059] Furthermore, the advantage of bending the developing attachment structure toward the inner side of the stent at an angle of α is that the developing structure bends toward the inner cavity of the stent and is not on the same curved surface as the main cylindrical surface of the stent. The developing structure will not scratch the blood vessel wall and can effectively protect the blood vessel. In addition, the stent is curled after being released in the blood vessel, and the inwardly inclined developing structure can form a three-dimensional thrombus-grasping structure, which works together with the stent mesh to greatly enhance the thrombus-grasping effect. Fig.12 This is the natural axial view of the stent; Fig.13 The axial view of the stent when it is curled in the working state is Fig.13 It can be seen that the extended developing structure can block and capture the thrombus. Since the developing structure is arranged in layers and multiple groups, the thrombus-catching ability is stronger.

[0060] In addition, for different designs of the developing mark attachment mechanism of the bracket, before the developing ring is installed, the mounting portion 1 and the bracket rod 41 can form an angle according to the aforementioned shaping method.

[0061] Figure 8 The cross-section analysis of the development structure after riveting is carried out. Figure 7It is a schematic diagram of the riveting and cutting position in one embodiment.

[0062] Figure 7 The BB view, that is Figure 8 The un-riveted part of the developing ring designed with double short grooves and middle short grooves. Figure 8 It can be seen that there is a large gap between the upper part of the developing ring and the upper surface of the developing mark attachment mechanism. This gap is filled with implant-grade UV curing glue, which can greatly increase the connection strength between the developing ring and the developing mark attachment mechanism of the bracket, and realize the double insurance of physical connection.

[0063] Compared with the prior art, the developing mark attachment structure of the present application has a smaller cross-sectional area of ​​the riveted design while achieving the same developing function and performance, and the height beyond the support column is only the thickness of the developing ring ( Figure 8 As shown), in conventional technology, the connecting rod 3 of the stent developing ring is in the middle of the developing ring, and nearly half of the diameter of the developing ring exceeds the stent cylinder. When the stent is fully opened in the blood vessel, the scratches on the blood vessel wall will be more serious.

[0064] Further, such as Fig. 9 As shown, the length range of L is 0.3-1.5mm; the length range of L1 and L2 is 0.15-1.2mm; the width range of B is 0.12-0.4mm; the width range of B1 is 0.02-0.15mm; the width range of B2 is 0.06-0.35mm; and the angle between the connecting rod 3 and the bracket rod 41 is 30-75°.

[0065] In summary, the attachment structure of the development marker of the present application has the following advantages when used in surgery:

[0066] 1. The developing ring does not need to be welded by a laser welding machine, saving equipment investment costs;

[0067] 2. The developing ring is physically riveted and connected, with high connection stability and high connection strength;

[0068] 3. After riveting, the developing ring becomes flat, which reduces the cross-sectional area of ​​the developing component and the cross-sectional volume of the developing ring in the state of the bracket being pressed, and can significantly reduce the resistance of the bracket conveying;

[0069] 4. After the developing ring is riveted, the height of the protruding stent cylinder on the outside of the developing ring is lower than that of the traditional existing connection form, which can reduce the scratching of the blood vessel wall when the stent is opened in the blood vessel and the thrombus is pulled;

[0070] 5. The developing marker attachment structure forms an angle with the stent rod and extends into the stent cavity, which can further reduce the scratches on the blood vessels and form a three-dimensional thrombus catching and grasping effect.

[0071] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. An attachment structure for a development mark, characterized in that: It includes a developing part, a mounting part and a connecting rod; The mounting portion is suitable for connecting to one of the stent rods of the vascular stent, the mounting portion is in a sheet-like structure, one end of the mounting portion is provided with the connecting rod extending outward, the connecting rod is suitable for being installed to the stent rod, and a hollow structure is provided on the mounting portion, the area of ​​the hollow structure accounts for 30%-70% of the total area of ​​the mounting portion; The developing part is sleeved and fixed on the mounting part, and the developing ring is recessed inwardly into the hollow structure at a position corresponding to the hollow structure, and a preset protrusion is provided in the same end surface of the recessed position on the developing ring.

2. The attachment mechanism of the vascular stent development mark according to claim 1, characterized in that: A hollow structure is provided in the middle of the mounting portion, and the ratio of the length of the hollow structure in the direction of the bracket rod to the length of the mounting portion in the bracket rod is less than 1 / 3; The developing part has symmetrical preset protrusions on both sides of the hollow structure.

3. The attachment mechanism of the vascular stent development mark according to claim 1, characterized in that: Two to three hollow structures are arranged on the mounting portion along the direction of the bracket rod, and a preset protrusion is provided between two adjacent depressions of the developing portion.

4. The attachment mechanism of the vascular stent development marker according to any one of claims 1 to 3, characterized in that: The opposite end surface of the developing portion where the depression is arranged is a flat surface.

5. The attachment mechanism of the vascular stent development marker according to any one of claims 1 to 3, characterized in that: The mounting portion is provided with a first limiting boss, the first limiting boss is arranged at a position where the mounting portion is connected to the connecting rod, and the first limiting boss is in contact with the developing ring.

6. The attachment mechanism of the vascular stent development mark according to claim 5, characterized in that: The mounting portion is in a rectangular sheet-like structure, and the connecting rod extends outward obliquely from one end corner of the mounting portion in the length direction; The hollow structure is in the form of a square groove, and the corners of the hollow structure are rounded, and the rounded corners adjacent to the connecting rod are larger; The edge of the hollow structure adjacent to one side of the connecting rod is kept flush with the bottom of the first limiting boss.

7. The attachment mechanism of the vascular stent development marker according to any one of claims 1 to 3, characterized in that: The mounting portion is in a rectangular structure, and a second limiting boss is slightly extended outward from the remaining corners of the mounting portion that are not connected to the connecting rod, and one end of the mounting portion that is not connected to the connecting rod is in a convex arc structure.

8. A vascular stent, characterized in that: It comprises a support body and an attachment structure of a development mark according to any one of claims 1 to 7; The support body is a columnar structure with a hollow interior, and the side wall of the support body is a grid structure composed of a plurality of support rods; The number of the attachment structures of the development mark is multiple and is installed in the middle part of the vascular stent; Specifically, the attachment structure of the development mark is installed on the side of one of the support rods, and the connecting rod and the support rod have a first preset angle, and the preset angle ranges from 30° to 75°.

9. The vascular stent according to claim 8, characterized in that: The developing mark attachment structure is bent toward the central axis direction of the bracket body; The angle between the developing mark attachment structure and its tangent at the position of the bracket body is a second preset angle; the range of the second preset angle is 10°-45°.

10. The vascular stent according to claim 9, characterized in that: The concave end surface of the developing portion faces the inner side of the bracket body; The developing marks arranged adjacent to each other in the circumferential direction of the bracket body together form a developing section, and the developing section is linearly arranged on the side wall of the bracket body or the developing section is spirally arranged on the side wall of the bracket body.

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