A vascular stent

Abstract

The present invention relates to the technical field of medical devices, and specifically discloses a vascular stent. The stent is tubular and includes a plurality of support rings and a plurality of connecting rods. 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 a connecting rod. The vascular stent includes a middle region and two end regions arranged along the axial direction. The two end regions are respectively located at the two axial ends of the vascular stent, and the middle region is located between the two end regions. The support rings located in the middle region include a plurality of first support rods connected circumferentially, and the support rings in the end regions include a plurality of second support rods connected circumferentially. The width of the first support rod is greater than the width of the second support rod. By limiting the widths of the support rings in each part, the stent can ensure good flexibility at both ends and strong supporting force in the middle before expansion, so as to improve the stent's passability. After expansion, the stent can axially retract and has a uniform shape, so as to reduce the dog-bone effect.

Description

Technical Field

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

[0002] Cardiovascular diseases have been recognized as one of the most serious diseases threatening people's lives and health, with their incidence and mortality rates ranking first among various 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 dependence on drugs; while surgical operations will cause permanent harm to patients; interventional treatment methods have become the best method for treating cardiovascular stenosis due to their minimally invasive nature and high efficiency. In the prior art, a vascular stent interventional solution is often adopted to treat cardiovascular diseases such as coronary artery obstruction. The stent implantation is a surgical method based on PTCA (Percutaneous Transluminal Coronary Angioplasty), in which a vascular stent is sent to the lesion through a delivery system and expanded to support the blood vessel.

[0003] The existing vascular stents have different structural designs and materials. 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 the same before expansion and the radial strength of the proximal and distal ends of the stent the same after expansion. This design cannot achieve ideal therapeutic effects for stenotic blood vessels rich in calcified lesions; some stents have a large axial shortening rate after expansion due to limitations in the design structure, resulting in the risk that the stent cannot completely cover the lesion site after being implanted; some stents have the phenomenon that the two ends open in advance during the expansion process, leading to axial retraction of the stent. In the case where the phenomenon of the two ends opening is obvious, there will be a situation where the two ends bulge and the middle contracts. The harm brought by this situation is obvious. If the two ends open too much, it will cause obvious damage to the blood vessel by the stent, 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 stent's passability; and enables the stent to axially retract and have a uniform shape after expansion to reduce the dogbone effect.

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

[0006] A vascular stent, the vascular stent is tubular, including a plurality of support rings and a plurality of connecting rods. 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 region and two end regions arranged along the axial direction. The two end regions are respectively located at both axial ends of the vascular stent, and the middle region is located between the two end regions. The support rings in the middle region include a plurality of first support rods connected circumferentially, and the first support rods have a first width extending along the circumferential surface of the vascular stent. The support rings in the end regions include a plurality of second support rods connected circumferentially, and 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 alternative technical solution of the vascular stent, the support rings are wavy. Along the axial direction of the vascular stent, the peaks of the plurality of support rings correspond to each other, and the valleys correspond to each other. The connecting rods extend along the axial direction of the vascular stent, and the connecting rods connect the peaks of two adjacent support rings.

[0008] As an alternative technical solution of the vascular stent, the connecting rods include a plurality of first connecting rods. The support rings in the end regions are connected to the adjacent support rings in the middle region by the plurality of first connecting rods, and the first connecting rods have bending sections.

[0009] As an alternative technical solution of the vascular stent, the connecting rods include a plurality of second connecting rods. The adjacent support rings in the middle region are connected by the plurality of second connecting rods. The second connecting rods have W-shaped bending sections or the second connecting rods are straight rods.

[0010] As an alternative technical solution of the vascular stent, each support ring has a first peak, a first valley, a second peak and a second valley arranged alternately in the circumferential direction. There is a positional deviation of a predetermined angle of rotation around the axial direction of the vascular stent between two adjacent support rings. Axially, the first peak on one support ring faces the second peak on another support ring, and the first valley on one support ring faces the second valley on another support ring. Axially, the valley value of the support ring at the second valley is greater than the valley value of the first valley, and the peak value of the second peak is greater than the peak value of the first peak.

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

[0012] As an alternative technical solution of the vascular stent, in the circumferential direction of the vascular stent, the circumferential width of the support ring at the first peak is the first circumferential width, and the circumferential width of the support ring at the second peak is the second circumferential width, and the first circumferential width is less than the second circumferential width.

[0013] As an alternative technical solution of 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 alternative technical solution of the vascular stent, the material of the connecting rod is stainless steel; and / or the material of the support ring is stainless steel.

[0015] As an alternative technical solution of the vascular stent, the vascular stent is formed by laser engraving of cobalt-chromium alloy.

[0016] Advantages of the present invention:

[0017] With the aid of a plurality of support rings arranged at intervals and connecting rods arranged between adjacent two support rings, the vascular stent realizes a closed-loop structure design for the whole vascular stent, thereby increasing the radial supporting force of the vascular stent, so that all support rings are connected by connecting rods to form a net-shaped tubular structure, and the stent wall is a grid-shaped hollow wall. By defining that the first width is greater than the second width, the compliance of the end region is good before the vascular stent is expanded, and the supporting force of the middle region is strong, thereby improving the passing performance of the vascular stent, making it easy for the vascular stent to pass through the narrow lesion area. The above improvements enable the vascular stent to axially retract after expansion and have a uniform shape to reduce the dog-bone effect. During the opening process of the vascular stent, the stress area at both ends is reduced, which can reduce the probability of the dog-bone effect; moreover, due to the thinner pattern design in the end region, after the vascular stent is implanted into the lesion site, the stimulation to the human blood vessel is reduced. The above structural improvements can improve the bending property and flexibility of the vascular stent itself, reduce the axial shortening rate after the vascular stent is deployed, and have a balanced force in the circumferential direction, and improve the ability of the vascular stent to pass through complex lesions. Description of the drawings

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

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

[0020] In the figure:

[0021] X, axial direction;

[0022] 1. End region; 2. Middle region; 3. Second connecting rod; 4. First connecting rod; 5. First peak; 6. Second peak; 7. First trough; 8. Second trough; 9. First width; 10. Second width; 11. First circumferential width; 12. Second circumferential width; 13. Third width; 14. Fourth width. Detailed implementation manner

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0024] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is 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 a limitation of 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 moreover, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicating that the first feature has a lower horizontal height than the second feature.

[0025] In the description of the present invention, it should be noted that unless otherwise clearly defined 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 directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0026] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present invention and cannot be understood as a limitation of the present invention.

[0027] Embodiment 1

[0028] As shown Figure 1 in the figure, this embodiment provides a vascular stent. The vascular stent is tubular and includes a plurality of support rings and a plurality of connecting rods. 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 a connecting rod. The vascular stent includes a middle region 2 and two end regions 1 arranged along the axial direction X. The two end regions 1 are respectively located at both ends of the vascular stent along the axial direction X, and the middle region 2 is located between the two end regions 1. The support rings in the middle region 2 include a plurality of first support rods connected circumferentially. The first support rods have a first width 9 extending along the circumferential surface of the vascular stent. The support rings in the end region 1 include a plurality of second support rods connected circumferentially. 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.

[0029] With the help of a plurality of support rings arranged at intervals and the connecting rods arranged between two adjacent support rings, the vascular stent realizes the closed-loop structure design of the whole vascular stent, thereby increasing the radial supporting force of the vascular stent, making all the support rings connected by the connecting rods form a network tube-like structure, and the stent wall is a grid-like hollow wall. By defining that the first width 9 is greater than the second width 10, the flexibility of the end region 1 is good and the supporting force of the middle region 2 is strong before the vascular stent is expanded, thereby improving the passability of the vascular stent and making the vascular stent easy to pass through the narrow lesion area. The above improvements enable the vascular stent to axially retract after expansion and have a uniform shape to reduce the dog-bone effect. During the opening process of the vascular stent, the stress area at both ends decreases, which can reduce the probability of the dog-bone effect; moreover, due to the thinner pattern design of the end region 1, after the vascular stent is implanted into the lesion site, the stimulation to the human blood vessel is reduced. The above structural improvements can improve the bending and flexibility of the vascular stent itself, reduce the axial shortening rate after the vascular stent is deployed, and have a balanced 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 change in the hemodynamic characteristics inside and around the stent after the vascular stent is implanted, which leads to the formation of plaques inside the stent and vascular stenosis. The plaques and blood vessels radially contract under the action of their own elastic contraction force, and act on the stent to cause the same radial contraction, especially the maximum contraction amount at the narrowest part of the plaque, and finally form a shape similar to a dog bone with a narrow middle and thick 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 supporting force of the vascular stent. At the same time, the alternating and even distribution of the connecting rods also makes the pattern distribution of the vascular stent uniform after deployment and the force more balanced.

[0032] Specifically, the tangential cross-sections of the first support rod and the second support rod are both rectangular and remain unchanged all the time. The long side of the rectangle is the width of the corresponding support rod in the circumferential direction of the vascular stent, and the short side of the rectangle is the thickness of the corresponding support rod in the radial direction of the vascular stent (i.e., the rod thickness). 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 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. Along the axial direction X of the vascular stent, the peaks of multiple support rings correspond to each other, and the valleys correspond to each other; the connecting rod extends along the axial direction X of the vascular stent, and the peaks of adjacent two support rings are connected by the connecting rod.

[0034] The support ring is designed in a wavy shape. Multiple support rings are arranged corresponding to each other along the axial direction X, and the peaks and valleys of multiple support rings correspond to each other and are connected by the connecting rod. Thus, the wavy structure is defined, which further improves the bending property and flexibility of the vascular stent itself, makes the shape of the vascular stent after deployment more uniform, so that it can better fit the blood vessel wall, better adapt to the bending and expansion of the blood vessel, reduce the damage to the blood vessel, and further improve the ability of the vascular stent to pass through complex lesions. The above design also ensures the stable operation of the support ring, optimizes the stress condition of the vascular stent, simplifies the specific structures 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 connecting rod extending along the axial direction X can enhance the overall stability of the vascular stent.

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

[0036] There is a positional deviation of a predetermined angle of rotation around the axial direction X of the vascular stent between adjacent two support rings, whereby the stress condition of the vascular stent is optimized, the risk of damage to the vascular stent is reduced, and it helps to extend the service life of the vascular stent.

[0037] Each support ring has multiple crests and troughs that are alternately arranged circumferentially. This design can better adapt to the complex physiological structure of blood vessels, improving the compliance and support effect of the vascular stent. The design of the trough value and peak value of the second trough 8 and the second crest 6 can better meet the blood vessel requirements of different parts. At the same time, the settings of the trough values and peak values at different positions can better adapt to different parts of the blood vessels. The above design can further improve the bending and flexibility of the vascular stent itself, making the shape of the vascular stent after deployment more uniform, with a lower dog-bone rate and a lower axial shortening rate, and a more uniform pattern distribution.

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

[0039] According to the definition that the two adjacent support rings are offset by a predetermined angle along the circumferential direction of the vascular stent, combined with the content that the connecting rod connects the first crest 5 and the second crest 6, the meshes on the vascular stent are alternately arranged in a cycle, so as to optimize the circumferential force condition of the vascular stent and improve the radial load-bearing capacity of the vascular stent on the premise of ensuring the stable operation of the vascular stent.

[0040] Specifically, the pattern structure of the support rings in the middle region 2 is different from that of the support rings in the end region 1. The design that the patterns and widths of the support rings in the middle region 2 are different from those of the support rings in the end region 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] Further, the connecting rod includes a plurality of first connecting rods 4. The support rings in the end region 1 and the adjacent support rings in the middle region 2 are connected by the plurality of first connecting rods 4, and the first connecting rods 4 have bending sections. With the above design, a firm connection between adjacent support rings can be achieved, thus ensuring the working stability of the vascular stent and enhancing the radial support force of the vascular stent.

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

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

[0044] In the circumferential direction of the vascular stent, the circumferential width at the first peak 5 is smaller than that at the second peak 6. This design enables the vascular stent to better adapt to the shape of the blood vessel while maintaining sufficient support strength, reducing the irritation to the blood vessel. As a result, before the vascular stent is expanded, the mutual collision between the peaks of the support rings can be avoided, preventing the direct extrusion and contact between the peaks and the connecting rods, and improving the performance of the vascular stent in passing through complex lesions.

[0045] Exemplarily, the peak between the first trough 7 and the third width 13 adjacent on the same support ring in the middle region 2 is defined as the reference peak. The distance between the first trough 7 and the reference peak in the axial direction X is the third width 13, and the distance between the second trough 8 and the reference peak in the axial direction X is the fourth width 14. The third width 13 is smaller than the fourth width 14. Among them, the reference peak can be any one of the first peaks 5 or the second peaks 6.

[0046] Exemplarily, the second width 10 is from 0.050 mm to 0.080 mm, and the first width 9 is from 0.060 mm to 0.090 mm. By defining the specific dimensions of the second width 10 and the first width 9, the force deformation situation of the vascular stent can be planned, making the working scenario of the vascular stent predictable, which helps to achieve the design purpose of reducing the dog-bone effect.

[0047] In an implementation manner of this embodiment, the materials of the connecting rods and the support rings are both stainless steel. Stainless steel has comprehensive advantages such as good mechanical properties, corrosion resistance, satisfactory biocompatibility, and low price, and is widely used in the medical field. It has high strength and hardness, shows a martensite structure on the surface after heat treatment, and has high support strength. Therefore, it is suitable as the material of the vascular stent. The above design enables 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 engineering, a manufacturing scheme of only defining the material of the connecting rods as stainless steel or only defining the material of the support rings as stainless steel can also be adopted. The specific selection is determined by those skilled in the art according to the actual engineering, and the determination method is common knowledge in the art, so it will not be elaborated here.

[0049] In another implementation manner of this embodiment, the vascular stent is formed by laser engraving of cobalt-chromium alloy. The vascular stent formed by laser engraving adopts a non-contact processing method, which 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 implementation manners of this embodiment, the vascular stent can be made of other conventional materials in the art, such as cobalt-nickel alloy or platinum-chromium alloy, etc.

[0051] The connecting rod includes a plurality of second connecting rods 3, and the adjacent support rings within the middle region 2 are connected by the plurality of second connecting rods 3.

[0052] Considering the particularity of the vascular stent material, non-contact testing methods are more suitable 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] Currently, high-precision image measuring instruments are usually used for measurement, such as two-dimensional image measuring machines. These devices directly reflect the image on the screen through a customized high-resolution CCD (charge coupled device) camera to clearly display the appearance and internal structure of the vascular stent. The use of the image measuring instrument avoids the surface scratching and deformation problems that may be caused by traditional contact measuring tools, improving the accuracy and safety of measurement.

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

[0055] By adopting the design of using straight rods in the middle region 2 and setting bending sections at the end regions 1, the stress condition of the vascular stent can be improved. Since the bending sections are prone to deformation at both ends of the vascular stent, and the second width 10 is thinner than the first width 9, the flexibility of the expanded front end region 1 is stronger than that of the middle region 2, thereby preventing the occurrence of the dog-bone effect. During the opening process of the vascular stent with the above design, the stress area at both ends is further reduced, and the bending design of the first connecting rod 4 further reduces the stimulation of the vascular stent to the human blood vessel.

[0056] Embodiment Two

[0057] As Figure 2 shown, the vascular stent of this Embodiment Two is basically the same as that of the above Embodiment One. The difference between the two is that the second connecting rod 3 has a W-shaped bending section.

[0058] The above design enables the connecting rod to be easily extended along the axial direction X after the vascular stent is deployed, thereby making up for the length of the axial retraction of the vascular stent and reducing the overall axial retraction rate of the vascular stent.

[0059] Specifically, the number of bends of the second connecting rod 3 is more 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] Considering that the extrusion stress on both ends of the second connecting rod 3 is relatively large, the second connecting rod 3 adopts a longer connection dimension combined with a larger deformation allowance to maintain sufficient toughness; while the width of the end region 1 is small, the first connecting rod 4 adopts a shorter connection dimension combined with a smaller deformation allowance to maintain sufficient bracket rigidity. At the same time, an overly long length of the first connecting rod 4 will also increase the risk of the vascular stent being folded at the curved blood vessel site.

[0061] Of course, the shape of the connecting rod is not limited to all the above structures, and can also be structures such as "dot shape", "U shape", "S shape", "V shape", "N shape" and combinations. The specific structure is determined by the staff in the field according to the actual project, and the determination method is a conventional technical means in the field, which will not be elaborated here.

[0062] Obviously, the above embodiments of the present invention are merely examples for clearly explaining the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall 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); The support ring is in a wave shape, 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; The connecting rod comprises 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 rod (4) has a curved section; The connecting rod comprises a plurality of second connecting rods (3), and the adjacent supporting rings located in the middle area (2) are connected by the plurality of second connecting rods (3); the second connecting rod (3) has a W-shaped bending section, the number of bends of the second connecting rod (3) is greater than the number of bends of the first connecting rod (4), and the length of the second connecting rod (3) is greater than the length of the first connecting rod (4); 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, and the thickness is 0.5 to 1.5 times the corresponding width; 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) 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 blood vessel stent between two adjacent support rings; on the axial direction X of the blood vessel stent, the first wave crest (5) on one of the support rings is opposite to the second wave crest (6) on the other support ring, and the first wave trough (7) on one of the support rings is opposite to the second wave trough (8) on the other support ring; on the axial direction X of the blood vessel 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); 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).

2. The vascular stent according to claim 1, 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.

3. 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.

4. The vascular stent according to any one of claims 1 to 3, characterized in that: The connecting rod is made of stainless steel; and / or The support ring is made of stainless steel.

5. The vascular stent according to any one of claims 1 to 3, characterized in that: The vascular stent is made of cobalt-chromium alloy by laser melting.

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