Intravascular stent

Abstract

The invention relates to the technical field of medical instruments, and particularly discloses an intravascular stent. The stent is tubular and comprises a plurality of supporting rings and a plurality of connecting rods, the supporting rings are arranged at intervals in the axial direction of the intravascular stent, and every two adjacent supporting rings are connected through the corresponding connecting rod; the intravascular stent comprises a middle area and two end areas which are arranged in the axial direction, the two end areas are located at the two axial ends of the intravascular stent respectively, the middle area is located between the two end areas, the portion, located in the middle area, of the supporting ring comprises a plurality of first supporting rods connected in the circumferential direction, and the portion, located in the end areas, of the supporting ring comprises a plurality of second supporting rods connected in the circumferential direction. The width of the first supporting rod is larger than that of the second supporting rod. According to the stent, the widths of the supporting rings of all parts are limited, so that the good flexibility of the two ends of the stent is guaranteed before the stent is expanded, the supporting force of the middle is high, and the passing ability of the stent is improved; the stent is axially retracted after being expanded and is uniform in shape, so that the bone effect of a dog is reduced.

Description

Technical Field

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

[0002] Cardiovascular disease has been recognized as one of the most serious diseases that endanger people's lives and health, and its morbidity and mortality rate rank first among all kinds of diseases. At present, the treatment of coronary heart disease is divided into three categories: drug treatment, surgical operation and interventional treatment. Drug treatment has a long cycle, slow effect, and large side effects, and patients are prone to develop a high degree of dependence on drugs; while surgical operations will cause permanent damage to patients; interventional treatment methods have become the best method for treating cardiovascular stenosis due to their minimal trauma and high efficiency. In the existing technology, vascular stent intervention is often used to treat cardiovascular diseases such as coronary artery obstruction. Stent implantation is a surgical method based on PTCA (Percutaneous Transluminal Coronary Angioplasty), which delivers vascular stents to the lesion through a delivery system and expands them to support the blood vessels.

[0003] The existing vascular stent structural designs and materials have their own characteristics. Some stents adopt the same unit structure design at the proximal and distal ends, which makes the flexibility of the proximal and distal ends of the stent consistent before expansion, and the radial strength of the proximal and distal ends of the stent is the same after expansion. This design cannot achieve ideal therapeutic effects on narrow blood vessels rich in calcification lesions; due to the limitations of the design structure, some stents have a large axial shortening rate after expansion, which makes there is a risk that the lesion site cannot be completely covered after the stent is implanted; during the expansion process of some stents, the two ends are opened prematurely, resulting in axial retraction of the stent. If the two ends are opened obviously, the two ends will bulge while the middle will shrink. The harm caused by this situation is obvious. If the two ends are opened too much, the stent will cause obvious damage to the blood vessel, which is not conducive to the recovery of the patient's injury. Summary of the invention

[0004] The purpose of the present invention is to provide a vascular stent, which ensures good flexibility at both ends and strong supporting force in the middle before expansion to improve the passability of the stent; and enables the stent to retract axially after expansion and have a uniform shape to reduce the dog-bone effect.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] A vascular stent, which is tubular and includes a plurality of support rings and a plurality of connecting rods, wherein the plurality of support rings are arranged at intervals along the axial direction of the vascular stent, and two adjacent support rings are connected by the connecting rods; the vascular stent includes a middle area and two end areas arranged along the axial direction, the two end areas are respectively located at the axial ends of the vascular stent, the middle area is located between the two end areas, the support ring located in the middle area includes a plurality of first support rods connected along the circumferential direction, the first support rods have a first width extending along the circumferential surface of the vascular stent; the support ring in the end area includes a plurality of second support rods connected along the circumferential direction, the second support rods have a second width extending along the circumferential surface of the vascular stent, and the first width is greater than the second width.

[0007] As an optional technical solution for the vascular stent, the support ring is wavy, and along the axial direction of the vascular stent, the peaks of multiple support rings correspond to each other, and the troughs correspond to each other; the connecting rod extends along the axial direction of the vascular stent, and the peaks of two adjacent support rings are connected by the connecting rod.

[0008] As an optional technical solution of the vascular stent, the connecting rod includes a plurality of first connecting rods, the support ring in the end area is connected to the adjacent support ring in the middle area through the plurality of first connecting rods, and the first connecting rod has a curved section.

[0009] As an optional technical solution for the vascular stent, the connecting rod includes a plurality of second connecting rods, and the adjacent support rings in the middle area are connected by a plurality of second connecting rods; the second connecting rod has a W-shaped curved section or is a straight rod.

[0010] As an optional technical solution for the vascular stent, each of the support rings has a first wave crest, a first wave trough, a second wave crest and a second wave trough which are arranged alternately in the circumferential direction, and there is a position deviation of a predetermined angle of rotation around the axial direction of the vascular stent between two adjacent support rings; in the axial direction of the vascular stent, the first wave crest on one support ring faces the second wave crest on another support ring, and the first wave trough on one support ring faces the second wave trough on another support ring; in the axial direction of the vascular stent, the valley value of the support ring at the second wave trough is greater than the valley value of the first wave trough, and the peak value of the second wave crest is greater than the peak value of the first wave crest.

[0011] As an optional technical solution of the vascular stent, one end of the connecting rod is connected to one of the first wave peaks on one of the support rings, and the other end is connected to one of the second wave peaks on another adjacent support ring.

[0012] As an optional technical solution for the vascular stent, in the circumference of the vascular stent, the circumferential width of the support ring at the first wave peak is a first circumferential width, the circumferential width of the support ring at the second wave peak is a second circumferential width, and the first circumferential width is smaller than the second circumferential width.

[0013] As an optional technical solution for the vascular stent, the second width is 0.050 mm to 0.080 mm, and the first width is 0.060 mm to 0.090 mm.

[0014] As an optional technical solution for the vascular stent, the material of the connecting rod is stainless steel; and / or the material of the supporting ring is stainless steel.

[0015] As an optional technical solution for the vascular stent, the vascular stent is made of cobalt-chromium alloy by laser melting.

[0016] Beneficial effects of the present invention:

[0017] The vascular stent realizes the closed-loop structural design of the whole vascular stent by means of multiple support rings arranged at intervals and a connecting rod arranged between two adjacent support rings, thereby increasing the radial support force of the vascular stent, so that all the support rings are connected by the connecting rod to form a mesh tube-like structure, and the stent wall is a grid-like hollow wall. By limiting the first width to be greater than the second width, the vascular stent can ensure good flexibility in the end area before expansion and strong support force in the middle area, thereby improving the passability of the vascular stent and making it easy for the vascular stent to pass through the narrow lesion area. The above improvements enable the vascular stent to retract axially after expansion, and the shape is uniform to reduce the dog bone effect. During the opening process of the vascular stent, the force-bearing area at both ends is reduced, which can reduce the probability of the dog bone effect; and due to the finer pattern design of the end area, the stimulation to the human blood vessels is reduced after the vascular stent is implanted in the lesion site. The above structural improvements can improve the bendability and softness of the vascular stent itself, reduce the axial shortening rate of the vascular stent after expansion, and balance the force in the circumferential direction, and improve the ability of the vascular stent to pass through complex lesions. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of the deployment of the vascular stent provided in the first embodiment of the present invention;

[0019] Figure 2 It is a schematic diagram of the deployment of the vascular stent provided in the second embodiment of the present invention.

[0020] In the figure:

[0021] X, axial direction;

[0022] 1. End area; 2. Middle area; 3. Second connecting rod; 4. First connecting rod; 5. First wave crest; 6. Second wave crest; 7. First wave valley; 8. Second wave valley; 9. First width; 10. Second width; 11. First circumferential width; 12. Second circumferential width; 13. Third width; 14. Fourth width. DETAILED DESCRIPTION

[0023] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature include the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0027] Embodiment 1

[0028] like Figure 1 As shown, this embodiment provides a vascular stent, which is tubular and includes multiple support rings and multiple connecting rods. The multiple support rings are arranged at intervals along the axial direction X of the vascular stent, and two adjacent support rings are connected by connecting rods; the vascular stent includes a middle area 2 and two end areas 1 arranged along the axial direction X, the two end areas 1 are respectively located at the two ends of the axial direction X of the vascular stent, the middle area 2 is located between the two end areas 1, the support ring located in the middle area 2 includes multiple first support rods connected along the circumferential direction, the first support rod has a first width 9 extending along the circumferential surface of the vascular stent; the support ring in the end area 1 includes multiple second support rods connected along the circumferential direction, the second support rod has a second width 10 extending along the circumferential surface of the vascular stent, and the first width 9 is greater than the second width 10.

[0029] The vascular stent realizes the closed-loop structural design of the whole vascular stent by means of multiple support rings arranged at intervals and a connecting rod arranged between two adjacent support rings, thereby increasing the radial support force of the vascular stent, so that all the support rings are connected by the connecting rod to form a mesh tube-like structure, and the stent wall is a grid-like hollow wall. By limiting the first width 9 to be greater than the second width 10, the vascular stent can ensure good flexibility in the end area 1 before expansion, and strong support force in the middle area 2, thereby improving the passability of the vascular stent, so that the vascular stent can easily pass through the narrow lesion area. The above improvements enable the vascular stent to retract axially X after expansion, and the shape is uniform to reduce the dog bone effect. During the opening process of the vascular stent, the force-bearing area at both ends is reduced, which can reduce the probability of reducing the dog bone effect; and due to the finer pattern design of the end area 1, the stimulation to the human blood vessels is reduced after the vascular stent is implanted in the lesion site. The above structural improvements can improve the bendability and softness of the vascular stent itself, reduce the axial shortening rate of the vascular stent after expansion, and balance the force in the circumferential direction, and improve the ability of the vascular stent to pass through complex lesions.

[0030] Among them, the dog-bone effect refers to the changes in the hemodynamic characteristics in and around the stent after the vascular stent is implanted, which leads to plaque formation inside the stent and vascular stenosis. The plaque and blood vessels undergo radial contraction under the action of their own elastic contraction force, and act on the stent to cause it to shrink radially as well, especially at the narrowest part of the plaque, where the amount of contraction is the largest, eventually forming a dog-bone shape that is narrow in the middle and thick at both ends.

[0031] In this embodiment, the support rings and the connecting rods are alternately and evenly distributed in the vascular stent. This ensures the circumferential force balance of the vascular stent and improves the radial support force of the vascular stent. At the same time, the alternate and evenly distributed arrangement of the connecting rods also makes the pattern distribution of the vascular stent even after it is deployed, and the force is more balanced.

[0032] Specifically, the tangential cross-sections of the first support rod and the second support rod are both rectangular and remain unchanged. The long side of the rectangle is the width of the corresponding support rod along the circumference of the vascular stent, and the short side of the rectangle is the thickness of the corresponding support rod along the radial direction of the vascular stent (i.e., the rod thickness), and the rod thickness is 0.5 to 1.5 times the corresponding width. In summary, the long side of the tangential cross-section of the first support rod is the first width 9, and the long side of the tangential cross-section of the second support rod is the second width 10. The rectangular design of the first support rod and the second support rod facilitates the processing of the support ring, helps to improve the production efficiency of the vascular stent, and reduces the manufacturing cost of the vascular stent.

[0033] In this embodiment, the support ring is wavy, and along the axial direction X of the vascular stent, the peaks of the multiple support rings correspond to each other, and the troughs correspond to each other; the connecting rod extends along the axial direction X of the vascular stent, and the peaks of two adjacent support rings are connected by the connecting rod.

[0034] The support ring is designed in a wave shape, and multiple support rings are arranged correspondingly along the axial direction X, and the peaks and troughs of the multiple support rings correspond to each other, and are connected by connecting rods, thereby defining the structure of the wave shape, which can further improve the bending and flexibility of the vascular stent itself, and make the shape of the vascular stent after deployment more uniform, so that it can better fit the vascular wall, better adapt to the bending and expansion of the blood vessel, reduce damage to the blood vessel, and further improve the ability of the vascular stent to pass through complex lesions. The above design can also ensure the stable operation of the support ring, optimize the stress condition of the vascular stent, simplify the specific structure of the support ring and the connecting rod, thereby ensuring the long-term stable operation of the vascular stent and reducing the space occupied by the vascular stent. Moreover, the design of the axial X extension of the connecting rod can enhance the overall stability of the vascular stent.

[0035] In this embodiment, each support ring has a first wave crest 5, a first wave trough 7, a second wave crest 6 and a second wave trough 8 which are arranged alternately in the circumferential direction, and there is a position deviation of a predetermined angle of rotation around the axial direction X of the vascular stent between two adjacent support rings; on the axial direction X of the vascular stent, the first wave crest 5 on one support ring faces the second wave crest 6 on the other support ring, and the first wave trough 7 on one support ring faces the second wave trough 8 on the other support ring; on the axial direction X of the vascular stent, the valley value of the support ring at the second wave trough 8 is greater than the valley value of the first wave trough 7, and the peak value of the second wave crest 6 is greater than the peak value of the first wave crest 5.

[0036] There is a position deviation of a predetermined angle of rotation around the axial direction X of the vascular stent between two adjacent support rings, thereby optimizing the stress condition of the vascular stent, reducing the risk of damage to the vascular stent, and helping to extend the service life of the vascular stent.

[0037] Each support ring has multiple crests and troughs that are staggered in sequence along the circumferential direction. This design can better adapt to the complex physiological structure of the blood vessel and improve the compliance and support effect of the vascular stent. The valley and peak value design of the second trough 8 and the second crest 6 can better meet the needs of blood vessels in different parts. At the same time, the setting of valleys and peak values ​​at different positions can better adapt to different parts of the blood vessel. The above design can further improve the bendability and flexibility of the vascular stent itself, making the morphology of the vascular stent after deployment more uniform, with a lower dog bone rate, a lower axial shortening rate, and a more uniform pattern distribution.

[0038] Furthermore, one end of the connecting rod is connected to a first wave crest 5 on a supporting ring, and the other end is connected to a second wave crest 6 on another adjacent supporting ring.

[0039] According to the limitation of the predetermined angle of offset between two adjacent support rings along the circumference of the vascular stent, combined with the content of connecting the first wave peak 5 and the second wave peak 6 by the connecting rod, the grids on the vascular stent are arranged in an alternating cycle, thereby optimizing the circumferential force condition of the vascular stent and improving the radial bearing capacity of the vascular stent while ensuring the stable operation of the vascular stent.

[0040] Specifically, the pattern structure of the support ring in the middle area 2 is different from the pattern structure of the support ring in the end area 1. The design of different patterns and widths of the support ring in the middle area 2 and the support ring in the end area 1 can further reduce the axial shortening rate of the vascular stent after expansion and reduce the dog-bone effect of the vascular stent.

[0041] Furthermore, the connecting rod includes a plurality of first connecting rods 4, and the support ring in the end area 1 is connected to the support ring in the adjacent middle area 2 through the plurality of first connecting rods 4, and the first connecting rod 4 has a curved section. With the above design, a stable connection between adjacent support rings can be achieved, thereby ensuring the working stability of the vascular stent and improving the radial support force of the vascular stent.

[0042] In this embodiment, in the circumferential direction of the blood vessel stent, the circumferential width of the support ring at the first wave crest 5 is a first circumferential width 11 , and the circumferential width of the support ring at the second wave crest 6 is a second circumferential width 12 , and the first circumferential width 11 is smaller than the second circumferential width 12 .

[0043] Specifically, the circumferential width of the support ring at the first wave crest 5 is defined as the circumferential spacing between the centers of two first intersection lines on the first wave crest 5, and the radial surface of the vascular stent is tangent to the outer arc surface of the first wave crest 5 at the first intersection line; the circumferential width of the support ring at the second wave crest 6 is defined as the circumferential spacing between the centers of two second intersection lines on the second wave crest 6, and the radial surface of the vascular stent is tangent to the outer arc surface of the first wave crest 5 at the second intersection line.

[0044] In the circumferential direction of the vascular stent, the circumferential width at the first wave crest 5 is smaller than that at the second wave crest 6. This design allows the vascular stent to better adapt to the shape of the blood vessel while maintaining sufficient support strength, thereby reducing stimulation to the blood vessel. This allows the vascular stent to avoid mutual collision between wave crests of the support ring before expansion, avoiding direct squeezing and collision between the wave crests and the connecting rod, thereby improving the performance of the vascular stent in passing through complex lesions.

[0045] Exemplarily, the peak between the adjacent first wave valley 7 and the third width 13 on the same support ring in the middle area 2 is defined as the reference wave peak, the spacing between the first wave valley 7 and the reference wave peak in the axial direction X is the third width 13, the spacing between the second wave valley 8 and the reference wave peak in the axial direction X is the fourth width 14, and the third width 13 is smaller than the fourth width 14. The reference wave peak may be any one of the first wave peak 5 or the second wave peak 6.

[0046] For example, the second width 10 is 0.050 mm to 0.080 mm, and the first width 9 is 0.060 mm to 0.090 mm. By limiting the specific sizes of the second width 10 and the first width 9, the stress deformation of the stent can be planned, so that the working scene of the stent can be predicted, which helps to achieve the design purpose of reducing the dog bone effect.

[0047] In one implementation of this embodiment, the connecting rod and the support ring are made of stainless steel. Stainless steel has good mechanical properties and corrosion resistance, satisfactory biocompatibility, and low price, and is widely used in the medical field. It has high strength and hardness, and after heat treatment, the surface presents a martensitic structure and has high support strength, so it is suitable as a material for a vascular stent. The above design allows the vascular stent to be integrally formed, thereby reducing the production cost of the vascular stent, improving the manufacturing efficiency of the vascular stent, and ensuring the structural strength of the vascular stent.

[0048] In the actual project, a manufacturing scheme can also be adopted in which only the material of the connecting rod is limited to stainless steel or only the material of the supporting ring is limited to stainless steel. The specific selection is determined by technicians in this field based on the actual project. The determination method is common knowledge in this field and will not be elaborated here.

[0049] In another implementation of this embodiment, the vascular stent is made of cobalt-chromium alloy by laser melting. The vascular stent made by laser melting adopts a non-contact processing method, has the advantages of high processing accuracy, high processing quality and fast processing speed, and helps to improve the product quality and working stability of the vascular stent.

[0050] In other implementations of this embodiment, the vascular stent may be made of other conventional materials in the art, such as cobalt-nickel alloy or platinum-chromium alloy.

[0051] The connecting rods include a plurality of second connecting rods 3 , and adjacent support rings in the middle area 2 are connected by the plurality of second connecting rods 3 .

[0052] Taking into account the particularity of the vascular stent material, non-contact testing methods are more applicable when testing the first width 9, the second width 10, the first circumferential width 11 and the second circumferential width 12. Such methods will not cause physical damage to the vascular stent and can achieve high-precision measurement.

[0053] At present, high-precision image measuring instruments are usually used for measurement, such as two-dimensional image measuring machines. These devices use customized high-resolution CCD (charge coupled device) cameras to directly reflect images on the screen to clearly show the appearance and internal structure of the vascular stent. The use of image measuring instruments avoids the surface scratches and deformations that may be caused by traditional contact measurement tools, and improves the accuracy and safety of measurement.

[0054] In this embodiment, the second connecting rod 3 is a straight rod.

[0055] The design of using a straight rod in the middle area 2 and setting a curved section in the end area 1 can improve the stress of the vascular stent. Since the curved sections at both ends of the vascular stent are easy to deform, and the second width 10 is thinner than the first width 9, the flexibility of the end area 1 before expansion is stronger than the flexibility of the middle area 2, thereby preventing the occurrence of the dog bone effect. During the opening process of the vascular stent adopting the above design, the stress area at both ends is further reduced, and the curved design of the first connecting rod 4 further reduces the stimulation of the vascular stent to the human blood vessels.

[0056] Embodiment 2

[0057] like Figure 2 As shown, the vascular stent of the second embodiment is basically the same as the above-mentioned first embodiment, and the difference between the two is that the second connecting rod 3 has a W-shaped bending section.

[0058] The above design makes it easy for the connecting rod to stretch along the axial direction X after the vascular stent is deployed, thereby compensating for the axial retraction length of the vascular stent, resulting in a reduction in the overall axial retraction rate of the vascular stent.

[0059] Specifically, the number of bends of the second connecting rod 3 is greater than that of the first connecting rod 4 , and the length of the second connecting rod 3 is greater than that of the first connecting rod 4 .

[0060] Taking into account the large extrusion stress on both ends of the second connecting rod 3, the second connecting rod 3 adopts a longer connection dimension combined with a larger deformation margin to maintain sufficient toughness; and the width of the end area 1 is small, and the first connecting rod 4 adopts a shorter connection dimension combined with a smaller deformation margin to maintain sufficient stent rigidity. At the same time, if the length of the first connecting rod 4 is too long, it will increase the risk of the vascular stent being broken in the curved blood vessel area.

[0061] Of course, the shape of the connecting rod is not limited to all the above-mentioned structures, but can also be a "point shape", "U shape", "S shape", "V shape", "N shape" and a combination of structures. The specific structure is determined by the staff in this field according to the actual engineering practice, and the determination method is the conventional technical means in this field, which will not be elaborated here.

[0062] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A vascular stent, characterized in that: The vascular stent is tubular, and includes a plurality of support rings and a plurality of connecting rods, wherein the plurality of support rings are arranged at intervals along the axial direction (X) of the vascular stent, and two adjacent support rings are connected by the connecting rods; The vascular stent comprises a middle area (2) and two end areas (1) arranged along the axial direction (X), the two end areas (1) are respectively located at two ends of the axial direction (X) of the vascular stent, the middle area (2) is located between the two end areas (1), the support ring located in the middle area (2) comprises a plurality of first support rods connected along the circumferential direction, the first support rods have a first width (9) extending along the circumferential surface of the vascular stent; the support ring in the end area (1) comprises a plurality of second support rods connected along the circumferential direction, the second support rods have a second width (10) extending along the circumferential surface of the vascular stent, and the first width (9) is greater than the second width (10).

2. The vascular stent according to claim 1, characterized in that: The support ring is wavy, and along the axial direction (X) of the vascular stent, the wave crests of the plurality of support rings correspond to each other, and the wave troughs correspond to each other; the connecting rod extends along the axial direction (X) of the vascular stent, and the wave crests of two adjacent support rings are connected by the connecting rod.

3. The vascular stent according to claim 2, characterized in that: The connecting rods include a plurality of first connecting rods (4), the support ring in the end area (1) is connected to the adjacent support ring in the middle area (2) via the plurality of first connecting rods (4), and the first connecting rods (4) have a bent section.

4. The vascular stent according to claim 3, characterized in that: The connecting rod comprises a plurality of second connecting rods (3), and the adjacent supporting rings located in the middle area (2) are connected via the plurality of second connecting rods (3); the second connecting rod (3) has a W-shaped curved section or the second connecting rod (3) is a straight rod.

5. The vascular stent according to claim 4, characterized in that: Each of the support rings has a first wave crest (5), a first wave trough (7), a second wave crest (6) and a second wave trough (8) arranged alternately in the circumferential direction, and there is a position deviation of a predetermined angle of rotation around the axial direction (X) of the vascular stent between two adjacent support rings; in the axial direction (X) of the vascular stent, the first wave crest (5) on one of the support rings faces the second wave crest (6) on the other support ring, and the first wave trough (7) on one of the support rings faces the second wave trough (8) on the other support ring; in the axial direction (X) of the vascular stent, the valley value of the support ring at the second wave trough (8) is greater than the valley value of the first wave trough (7), and the peak value of the second wave crest (6) is greater than the peak value of the first wave crest (5).

6. The vascular stent according to claim 5, characterized in that: One end of the connecting rod is connected to one of the first wave peaks (5) on one of the supporting rings, and the other end is connected to one of the second wave peaks (6) on another adjacent supporting ring.

7. The vascular stent according to claim 5, characterized in that: In the circumferential direction of the blood vessel stent, the circumferential width of the support ring at the first wave crest (5) is a first circumferential width (11), the circumferential width of the support ring at the second wave crest (6) is a second circumferential width (12), and the first circumferential width (11) is smaller than the second circumferential width (12).

8. The vascular stent according to claim 1, characterized in that: The second width (10) is 0.050 mm to 0.080 mm, and the first width (9) is 0.060 mm to 0.090 mm.

9. The vascular stent according to any one of claims 1 to 8, characterized in that: The connecting rod is made of stainless steel; and / or The support ring is made of stainless steel.

10. The vascular stent according to any one of claims 1 to 8, characterized in that: The vascular stent is made of cobalt-chromium alloy by laser melting.

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