Intravascular stent

Abstract

The invention discloses an intravascular stent which comprises annular supporting pieces and connecting structures, the multiple annular supporting pieces are arranged in the axial direction, and the annular supporting pieces can contract inwards or extend outwards in the radial direction; the connecting structure is connected with the two adjacent annular supporting pieces, the connecting structure comprises a first joint piece and a second joint piece which are in sliding fit, and the first joint piece and the second joint piece are fixed to the two adjacent annular supporting pieces respectively. According to the intravascular stent, the connecting structures connected between the annular supporting pieces are arranged to slide, so that the connecting structures can be adjusted along with contraction or extension of the annular supporting pieces in the radial direction, and the problem that the whole intravascular stent is shortened in the axial direction in the process that the annular supporting pieces extend in the radial direction can be effectively solved; and when the intravascular stent is released in the blood vessel, the intravascular stent can be slowly unfolded to generate smaller impact on the blood vessel, so that the blood vessel is better protected.

Description

Technical Field

[0001] The present invention relates to the field of vascular interventional medicine, particularly vascular stents. Background Art

[0002] In recent years, various acute and chronic vascular obstructive diseases caused by coronary atherosclerotic heart disease have seriously endangered human life, health and safety. According to the statistical data analysis of the American Heart Association, cardiovascular diseases have become the number one killer of human life and health. Currently, the treatments for cardiovascular diseases caused by vascular stenosis are mainly divided into three categories: drug therapy, surgical operation and interventional therapy. Vascular stent interventional therapy is an effective treatment method for vascular obstructive diseases that has developed most rapidly and has been widely used clinically at present, with the characteristics of minimally invasive and highly efficient.

[0003] Vascular stents can be divided into balloon-expandable vascular stents and self-expanding vascular stents according to the different stent expansion mechanisms during the interventional procedure. The materials commonly used for balloon-expandable vascular stents are medical stainless steel, while the materials commonly used for self-expanding vascular stents are nitinol alloys. The balloon-expandable vascular stent interventional procedure is to pre-compress and mount a vascular stent usually made of stainless steel by laser engraving on a folded balloon, and then along with the balloon, reach the lesion site along the guide wire. Then the balloon expands to expand the vascular stent to open the stenotic blood vessel, so as to restore blood flow. The self-expanding stent interventional procedure is first to heat-treat and form the vascular stent outside the body, and then compress the vascular stent in the catheter of the delivery system. After reaching the position of the patient's diseased blood vessel, after the stent is pushed out from the catheter of the delivery system, the vascular stent can automatically restore its shape before compression, so as to open the stenotic diseased blood vessel and restore blood flow.

[0004] The self-expanding vascular stent generally includes a plurality of annular support members and a connection structure connected between the annular support members. After the vascular stent is released from the catheter of the delivery mechanism, the vascular stent is prone to retraction after the extension is completed, thus causing the problem of shortening of the vascular stent. Larger shortening is likely to cause adverse clinical events. Summary of the Invention

[0005] The purpose of the present invention is to provide a vascular stent to solve the deficiencies in the prior art. It can effectively make up for the shortening problem that occurs in the axial direction during the radial expansion of the annular support members of the entire vascular stent, and when the vascular stent is released in the blood vessel, it can be slowly deployed, generating less impact on the blood vessel, so as to better protect the blood vessel.

[0006] The present invention provides a vascular stent, comprising:

[0007] Annular support members, a plurality of said annular support members are arranged in the axial direction and the annular support members can contract inward or extend outward in the radial direction;

[0008] Connection structure, connecting two adjacent annular support members, the connection structure includes a first engaging member and a second engaging member that are slidably engaged, and the first engaging member and the second engaging member are respectively fixed on two adjacent annular support members.

[0009] Further, the first engaging member includes a slider, and the second engaging member is provided with a chute that slidably cooperates with the slider, and the chute extends along the axial direction of the annular support member.

[0010] Further, the first engaging member further includes a support rod provided on the annular support member, the support rod extends along the axial direction of the annular support member, and the slider is fixed to one end of the support rod away from the annular support member;

[0011] The length of the support rod extending in the axial direction of the annular support member is not less than the length of the chute extending in the axial direction of the annular support member.

[0012] Further, the second engaging member further has an axial opening that is opened in the axial direction of the annular support member and exposes the chute outward; the support rod slidably cooperates with the axial opening;

[0013] The second engaging member further includes a limiting portion for limiting the assembly of the slider along the axial direction of the annular support member to the chute.

[0014] Further, the outer diameter dimension of the slider is larger than the outer diameter dimension of the support rod; the limiting portion is provided at the edge of the axial opening and is used to abut against the slider to limit the slider from passing through the axial opening.

[0015] Further, the second engaging member further has a radial opening that is opened in the radial direction of the annular support member and exposes the chute outward, and the size of the radial opening is adapted to the slider so that the slider can be assembled to the chute from the radial opening.

[0016] Further, the second engaging member includes a pair of enclosing plates arranged in the circumferential direction of the annular support member, and at least one of the enclosing plates includes an enclosing plate body and a protrusion protruding from the enclosing plate body towards the other enclosing plate; a chute is formed between the enclosing plate body and the other enclosing plate, an axial opening is formed between the protrusion and the other enclosing plate, and the limiting portion is provided on the protrusion.

[0017] Further, the annular support member is integrally wavy or serrated and has peaks or valleys; the peaks of two adjacent annular support members are opposite to each other or the peak and the valley are opposite to each other, and at least one of the first engaging member and the second engaging member is fixed to the peak.

[0018] Further, the annular support member has a plurality of repeating units arranged in the circumferential direction of the annular support member and outer connecting arms connected between two adjacent repeating units;

[0019] The repeating unit includes a pair of support arms and an inner connecting arm connecting the pair of support arms; the repeating unit is elastically deformable so that the pair of support arms of the repeating unit can approach each other or move away from each other.

[0020] Further, the repeating unit has a V-shaped structure, and a pair of the support arms are intersectingly arranged.

[0021] Compared with the prior art, in the present invention, the connection structure connected between the annular support members is set to be sliding, so that the connection structure can be adjusted as the annular support member contracts or expands in the radial direction, thereby effectively compensating for the shortening problem in the axial direction during the process of the annular support member expanding in the radial direction of the entire vascular stent. Moreover, when the vascular stent is released in the blood vessel, it can be slowly deployed, generating a smaller impact on the blood vessel, so as to better protect the blood vessel. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural diagram of the vascular stent disclosed in the embodiment of the present invention when it is deployed in the extended state;

[0023] Figure 2 is a schematic structural diagram of the vascular stent disclosed in the embodiment of the present invention when it is deployed in the contracted state;

[0024] Description of the reference numerals: 1 - annular support member, 10 - repeating unit, 101 - support arm, 102 - inner connecting arm, 11 - peak, 12 - valley, 13 - outer connecting arm,

[0025] 2 - connection structure, 21 - first engaging member, 211 - slider, 212 - support rod,

[0026] 22 - second engaging member, 220 - enclosing plate, 2201 - enclosing plate body, 2202 - protrusion, 221 - chute, 222 - limiting portion, 223 - axial opening. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention, and cannot be construed as limiting the present invention.

[0028] Embodiments of the present invention: AsFigure 1-2 As shown, a vascular stent is disclosed, which is mainly applicable to human blood vessels. During the process of implanting the vascular stent into the blood vessel, the vascular stent is installed in the catheter of the stent delivery system. At this time, the vascular stent is in a contracted state. When the delivery system transports the vascular stent to the lesion site, the vascular stent is released from the catheter into the blood vessel. At this time, the vascular stent is in an extended state to form a support for the blood vessel at the lesion site, achieving the purpose of supporting the stenosed and occluded blood vessel segment at the lesion site, reducing the elastic recoil and remodeling of the blood vessel, and maintaining the smooth blood flow in the blood vessel.

[0029] The vascular stent specifically includes a plurality of annular support members 1 and a connecting structure 2 connected between two adjacent annular support members 1. The annular support members 1 are integrally annular and have an axial direction and a radial direction perpendicular to the axial direction. The plurality of annular support members 1 are arranged along the axial direction of the annular support member 1 to form a columnar vascular stent as a whole. The annular support member 1 can contract inward or extend outward along the radial direction of the annular support member 1; it should be noted that inward here means moving towards the center of the circle where the annular support member 1 is located, and outward means moving away from the center of the circle where the annular support member 1 is located.

[0030] After the annular support member 1 contracts inward, it is in a contracted state. After the annular support member 1 extends outward, it is in an extended state. When in the contracted state, the outer diameter of the cross-section of the annular support member 1 is smaller than the outer diameter of the cross-section of the annular support member 1 when in the extended state.

[0031] Setting the annular support member 1 to be contractible or extensible has at least the following functions: on the one hand, after the vascular stent contracts inward, it can be more conveniently placed in the catheter of the stent delivery system, and thus it is easier to transport into the blood vessel. On the other hand, during the use of the vascular stent, with the cycle of the heart beating, the blood vessel will be subjected to external forces during each heartbeat, resulting in expansion or contraction. The contractible or extensible setting of the annular support member 1 enables the vascular stent to expand or contract synchronously with the expansion or contraction of the blood vessel; thus achieving a better support effect.

[0032] During the process of the annular support member 1 of the vascular stent contracting inward or extending outward along the radial direction, the vascular stent will also extend or contract in its axial direction, specifically manifested as an increase or decrease in the distance between two adjacent annular support members 1. To adapt to the above changes of the annular support member 1, the connecting structure 2 connected between two adjacent annular support members 1 is generally an elastically deformable member. As an elastically deformable member, the connecting structure 2 can be stretched under external force to compensate to a certain extent for the shortening in the axial direction generated during the process of the annular support member 1 extending in the radial direction.

[0033] However, during the release process of the connecting structure 2 as an elastic deformation member when entering the blood vessel from the compressed state to the extended state, it will retract, thus unable to effectively reduce the shortening problem of the vascular stent; and controlling the stretching or contraction of the connecting structure 2 by means of elastic deformation requires a large starting external force, that is, the blood vessel needs to have a large stretching force to overcome the deformation force of the elastically deformable member, while the acting force generated during the expansion and contraction of the blood vessel is generally small, and it is often impossible to stably control the deformation of the connecting structure 2.

[0034] In addition, during the delivery of the vascular stent into the blood vessel, the vascular stent is generally compressed in the catheter of the delivery mechanism. At this time, the connecting structure 2 as an elastic member is compressed and deformed. When the vascular stent is released into the blood vessel, the compressed and deformed connecting structure 2 is instantaneously released under the action of the reset resilience force, and the large reset resilience force is likely to cause an impact on the blood vessel.

[0035] To solve the above problems, as Figure 1-2 shown, the present application discloses that the connecting structure 2 includes a first engaging member 21 and a second engaging member 22 that are slidably engaged, and the first engaging member 21 and the second engaging member 22 are respectively fixed on two adjacent annular support members 1.

[0036] In this embodiment, the connecting structure 2 is set as the slidable first engaging member 21 and second engaging member 22, so that two adjacent annular support members 1 can move relative to each other in the axial direction. When the annular support member 1 contracts inward in the radial direction, as Figure 2 shown, the first engaging member 21 and the second engaging member 22 slide in the direction of approaching each other. When the annular support member 1 extends outward in the radial direction, as Figure 1 shown, the first engaging member 21 and the second engaging member 22 slide in the direction of moving away from each other.

[0037] The connecting structure 2 in this embodiment can slide as the annular support member 1 contracts or extends in the radial direction, thus effectively compensating for the shortening problem that occurs during the extension of the entire vascular stent in the radial direction of the annular support member 1, and because there is no elastic deformation, the retraction problem of elastic deformation can be effectively avoided. And when the vascular stent is released in the blood vessel, it can be slowly deployed, generating a smaller impact on the blood vessel, thereby better protecting the blood vessel.

[0038] The first engaging member 21 includes a slider 211, and the second engaging member 22 is provided with a sliding groove 221 that slidably cooperates with the slider 211. The sliding groove 221 extends along the axial direction of the annular support member 1. Through the cooperation of the slider 211 and the sliding groove 221, the sliding adjustment of the first engaging member 21 and the second engaging member 22 can be more stably achieved.

[0039] Of course, in other embodiments, a slide rail that slidably cooperates with the slider 211 may also be provided on the second engaging member 22. However, compared with using a slide rail, the cooperation between the chute 221 and the slider 211 can make the structure of the second engaging member 22 more compact and avoid occupying a large space.

[0040] The first engaging member 21 further includes a support rod 212 disposed on the annular support member 1. The support rod 212 extends along the axial direction of the annular support member 1, and the slider 211 is fixed to the end of the support rod 212 away from the annular support member 1. By providing the support rod 212, the slider 211 is disposed at a position relatively far from the annular support member 1, so that there is a larger adjustment space between two adjacent annular support members 1, and thus the vascular stent has a more flexible telescopic length.

[0041] In the above embodiment, the slider 211 is disposed at the end of the support rod 212. In other embodiments, the slider 211 may also be disposed on the side of the support rod 212.

[0042] As a preferred solution, the support rod 212, the slider 211 and the annular support member 1 are integrally formed, and specifically, laser cutting technology can be used for integral forming. Correspondingly, the second engaging member 22 and the annular support member 1 fixing the second engaging member 22 are also integrally formed. Of course, in other embodiments, both ends of the connecting structure 2 can also be fixed to the corresponding annular support members 1 respectively by welding or other connection and fixing processes.

[0043] The length of the support rod 212 extending in the axial direction of the annular support member 1 is not less than the length of the chute 221 extending in the axial direction of the annular support member 1. Such a structural setting can enable the slider 211 fixed to the end of the support rod 212 to slide within the entire chute 221; and when the slider 211 slides to the bottom of the chute 221, there is also a certain gap between two adjacent annular support members 1, avoiding interference between the two annular support members 1 when the vascular stent contracts radially.

[0044] The second engaging member 22 also has an axial opening 223 that is opened in the axial direction of the annular support member 1 and exposes the chute 221 outward; the support rod 212 slidably cooperates with the axial opening 223; the support rod 212 extends into the chute 221 along the axial opening 223, and during the process of the slider 211 sliding along the chute 221, the support rod 212 slides along the axial opening 223.

[0045] The second engaging member 22 further includes a limiting portion 222 for limiting the assembly of the slider 211 along the axial direction of the annular support member 1 to the sliding groove 221. In this embodiment, the limiting portion 222 is used to cooperate with the slider 211 to limit the movement stroke of the slider 211, and further limit the slider 211 from slipping out of the sliding groove 221 along the direction of the axial opening 223. Of course, in other embodiments, the limiting portion 222 can also cooperate with the support rod 212 to limit the movement stroke of the support rod 212.

[0046] To facilitate the cooperation between the limiting portion 22 and the slider 211 to limit the movement stroke of the slider 211, the outer diameter of the slider 211 is larger than the outer diameter of the support rod 212; the support rod 212 has a clearance fit with the axial opening 223, and the slider 211 has a clearance fit with the sliding groove 221; the limiting portion 222 is disposed at the edge of the axial opening 223 and is used to abut against the slider 211 to limit the slider 211 from passing through the axial opening 223.

[0047] To facilitate the assembly of the first engaging member 21 and the second engaging member 22, the second engaging member 22 further has a radial opening that is open in the radial direction of the annular support member 1 and exposes the sliding groove 221 outward. The size of the radial opening is adapted to the slider 211 so that the slider 211 can be assembled into the sliding groove 221 from the radial opening.

[0048] The radial opening can be opened inward along the radial direction of the annular support member 1, or can be opened outward along the radial direction of the annular support member 1. As a preferred solution, in this embodiment, there are two radial openings, and the two radial openings are oppositely arranged and are oppositely arranged on both sides of the sliding groove 221.

[0049] The arrangement of the two radial openings not only facilitates the installation and fixation of the slider 211 in the sliding groove 221, but also enables the first engaging member 21 and the second engaging member 22 to move more flexibly, enables the adjacent two annular support members 1 to swing more flexibly, and the entire vascular stent has better flexibility, which can improve the bending ability of the vascular stent in the delivery catheter.

[0050] In a specific embodiment, the second engaging member 22 includes a pair of gussets 220 arranged along the circumferential direction of the annular support member 1. At least one gusset 220 includes a gusset body 2201 and a protrusion 2202 protruding from the gusset body 2201 toward the other gusset 220; a sliding groove 221 is formed between the gusset body 2201 and the other gusset 220, an axial opening 223 is formed between the protrusion 2202 and the other gusset 220, and the limiting portion 222 is disposed on the protrusion 2202.

[0051] Specifically, in this embodiment, a pair of enclosing plates 220 are respectively a first enclosing plate and a second enclosing plate. The first enclosing plate and the second enclosing plate are arranged along the circumferential direction of the annular support 1. Both the first enclosing plate and the second enclosing plate include an enclosing plate body 2201 and a protrusion 2202 protruding from the enclosing plate body 2201 towards the other enclosing plate. A chute 221 is formed between the enclosing plate body of the first enclosing plate and the enclosing plate body of the second enclosing plate. The protrusions 2202 of the first enclosing plate and the protrusions 2202 of the second enclosing plate are opposite in position and an axial opening 223 is formed between the two protrusion parts of the two enclosing plates. Two limiting parts 222 are correspondingly provided. The two limiting parts 222 are respectively arranged on the protrusions 2202 of the two enclosing plates. The two limiting parts 222 are simultaneously abutted against the slider 211 to limit the movement stroke of the slider 211 in the axial direction of the annular support 1.

[0052] In a specific embodiment, the annular support 1 is integrally wavy or serrated and has a peak portion 11 and a valley portion 12; as Figure 1-2 shown, the peak portions 11 of two adjacent annular supports 1 are staggered from each other. The peak portion 11 of the previous annular support 1 is opposite in position to the valley portion 12 of the subsequent annular support 1. Both ends of the connecting structure 2 are respectively fixed to the valley portion 12 of the previous annular support 1 and the peak portion 11 of the subsequent annular support 1.

[0053] Specifically, the first engaging member 21 is fixed to the valley portion 12 of the previous annular support 1, and the second engaging member 22 is fixed to the peak portion of the subsequent annular support 1. In another embodiment, the first engaging member 21 can be fixed to the peak portion 11 of the subsequent annular support 1, and the second engaging member 22 is fixed to the valley portion 12 of the previous annular support 1.

[0054] When the peak portions 11 of two adjacent annular supports 1 are staggered from each other, the valley portion 12 of the previous annular support 1 protrudes relatively towards the direction of the subsequent annular support 1, and the peak portion 11 of the subsequent annular support 1 protrudes correspondingly towards the direction of the previous annular support 1. Therefore, the distance between the valley portion 12 of the previous annular support 1 and the peak portion 11 of the subsequent annular support 1 is the shortest. Arranging the connecting structure 2 between the two can make the connecting structure 2 have a shorter design.

[0055] Of course, in other embodiments, the peaks 11 of two adjacent annular supports 1 may be opposite in position (not shown in the figure), that is, the peak 11 of the previous annular support 1 is opposite in position to the peak 11 of the subsequent annular support 1. The first engaging member 21 is fixed to the peak 11 of the previous annular support 1, and the second engaging member 22 is fixed to the peak 11 of the subsequent annular support 1; or the first engaging member 21 is fixed to the valley of the previous annular support 1, and the second engaging member 22 is fixed to the valley 12 of the previous annular support 1. It should be noted that in the above embodiments, the positional relationship between the first engaging member 21 and the second engaging member 22 can be interchanged, which does not affect the use of the entire connection structure 2.

[0056] In the above several embodiments, both ends of the connection structure 2 are either fixed to the peaks 11 or fixed to the valleys 2. In other embodiments, both ends of the connection structure 2 can also be respectively fixed to positions between the peaks 11 and the valleys 12, or one end of the connection structure 2 is fixed to a position between the peaks 11 and the valleys 12, and the other end of the connection structure 2 is fixed to the peak 11 or the valley 12.

[0057] It can be understood that multiple connection structures 2 can be provided, and the multiple connection structures 2 are arranged along the circumferential direction of the annular support 1.

[0058] In this embodiment, the annular support 1 has a plurality of repeating units 10 arranged along the circumferential direction of the annular support and outer connection arms 13 connected between two adjacent repeating units;

[0059] The repeating unit 10 includes a pair of support arms 101 and an inner connection arm 102 connecting the pair of support arms 101; the repeating unit 10 can be elastically deformed so that the pair of support arms 101 of the repeating unit 10 can approach each other or move away from each other.

[0060] Under the action of an external force, after the repeating unit 10 is elastically deformed, the two support arms 101 approach each other, and at this time the annular support 1 is compressed, and the annular support 1 is in a contracted state; after the external force is withdrawn, under the action of the restoring elastic force of the elastic deformation, the two support arms 101 of the repeating unit 10 move away from each other, and at this time the annular support 1 is in an extended state.

[0061] The repeating unit 10 can be elastically deformed specifically by the support arm 101 generating elastic bending deformation or the inner support arm connecting between the two support arms 101 generating elastic bending deformation. Of course, in other embodiments, the annular support 1 can also be contracted by the elastic bending deformation of the outer connection arm 13.

[0062] In this embodiment, the repeating unit 10 as a whole has a V-shaped structure, and a pair of support arms 101 intersect. The inner connecting arm 102 and the outer connecting arm 13 are both arc-shaped as a whole, and the inner connecting arm 102 is bent as a whole in a direction away from the outer connecting arm 13, and the center of the arc where the inner connecting arm 102 is located is relatively located on the side of the inner connecting arm 102 facing the outer connecting arm 13; the outer connecting arm 13 is also bent as a whole in a direction away from the inner connecting arm 102, and the center of the arc where the outer connecting arm 13 is located is relatively located on the side of the outer connecting arm 13 facing the inner connecting arm 102.

[0063] As a preferred solution, a pair of support arms 101 on one repeating unit 10 are mirror images of each other.

[0064] The peak portion 11 is relatively located at the position of the outer connecting arm 13, and the valley portion 12 is correspondingly located at the position of the inner connecting arm 102. The first engaging member 21 is fixed on the outer connecting arm 13 or fixed on the inner connecting arm 102. The second engaging member 21 is fixed on the outer connecting arm 13 or fixed on the inner connecting arm 102.

[0065] In this embodiment, the support arms 101 are linear as a whole, and a pair of support arms 101 are arranged as mirror images of each other. In other embodiments, the support arms 101 can also be curved as a whole, or arranged in multiple broken lines. The two support arms 101 in one repeating unit can be mirror images of each other or not, and the two support arms 101 can intersect or be parallel. The repeating unit 10 as a whole can be U-shaped, R-shaped or Ω-shaped.

[0066] It can be understood that, as a preferred solution, in this embodiment, the material of the vascular stent is mainly a metal with shape memory characteristics such as nitinol. In this way, the compression of the vascular stent can be conveniently realized during the process of the vascular stent, and after being implanted into the human body, the vascular stent can gradually return to the preset shape under the action of body temperature and mechanical force, so as to play a role in supporting and expanding blood vessels. In addition, the elastic modulus of the nitinol stent is similar to that of human blood vessels, which can reduce the damage to the blood vessel wall and reduce the risk of thrombus formation.

[0067] The above has detailed the structure, features and effects of the present invention according to the embodiments shown in the drawings. The above is only the preferred embodiment of the present invention, but the present invention is not limited to the implementation scope shown in the drawings. Any changes made according to the concept of the present invention, or equivalent embodiments modified into equivalent changes, still within the spirit covered by the specification and the drawings, should be within the protection scope of the present invention.

Claims

1. A vascular stent, characterized in that, Comprising: Annular support members, a plurality of the annular support members are arranged in the axial direction and the annular support members can contract inward or extend outward in the radial direction of the annular support members; Connection structure, connecting two adjacent annular support members, the connection structure includes a first engaging member and a second engaging member in sliding fit, and the first engaging member and the second engaging member are respectively fixed on two adjacent annular support members.

2. The vascular stent according to claim 1, characterized in that: The first engaging member includes a slider, and a chute in sliding fit with the slider is arranged on the second engaging member, and the chute extends along the axial direction of the annular support member.

3. The vascular stent according to claim 2, wherein: The first engaging member further includes a support rod arranged on the annular support member, the support rod extends along the axial direction of the annular support member, and the slider is fixed at one end of the support rod away from the annular support member; The length of the support rod extending in the axial direction of the annular support member is not less than the length of the chute extending in the axial direction of the annular support member.

4. The vascular stent according to claim 3, wherein: The second engaging member further has an axial opening which is opened in the axial direction of the annular support member and exposes the chute outward; the support rod is in sliding fit with the axial opening; The second engaging member further includes a limiting portion for limiting the assembly of the slider along the axial direction of the annular support member into the chute.

5. The vascular stent according to claim 3, wherein: The outer diameter dimension of the slider is larger than the outer diameter dimension of the support rod; the limiting portion is arranged at the edge of the axial opening and is used for abutting against the slider to limit the slider from passing through the axial opening.

6. The vascular stent according to claim 3, wherein: The second engaging member further has a radial opening which is opened in the radial direction of the annular support member and exposes the chute outward, and the size of the radial opening is adapted to the slider so that the slider can be assembled into the chute from the radial opening.

7. The vascular stent according to claim 6, wherein: The second engaging member includes a pair of enclosing plates arranged in the circumferential direction of the annular support member, and at least one of the enclosing plates includes an enclosing plate body and a protrusion protruding from the enclosing plate body towards the other enclosing plate; a chute is formed between the enclosing plate body and the other enclosing plate, an axial opening is formed between the protrusion and the other enclosing plate, and the limiting portion is arranged on the protrusion.

8. The vascular stent according to claim 1, wherein: The annular support member is integrally wavy or serrated and has a peak portion or a valley portion; the peak portions of two adjacent annular support members are staggered from each other, and two ends of the connection structure are respectively fixed on the valley portion of the previous annular support member and the peak portion of the next annular support member.

9. The vascular stent according to claim 1, wherein: The annular support member has a plurality of repeating units arranged in the circumferential direction of the annular support member and outer connection arms connecting between two adjacent repeating units; The repeating unit includes a pair of support arms and an inner connection arm connecting between the pair of support arms; the repeating unit can be elastically deformed so that the pair of support arms of the repeating unit can approach each other or move away from each other.

10. The vascular stent according to claim 9, wherein: The repeating unit has a V-shaped structure, and a pair of support arms intersect.

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