Degradable intravascular stent

Abstract

The invention relates to a degradable intravascular stent, belongs to the technical field of intravascular stent design, and solves the problems of safety of an intravascular stent implantation process and targeted provision of vascular support for different vasculopathy conditions in the prior art. The support rings are arranged in parallel in the longitudinal direction of the degradable intravascular stent, and the connectors are used for connecting the longitudinally adjacent support rings; wherein the supporting ring is in a corrugated shape, extends in the circumferential direction and is enclosed into a ring shape, and the supporting ring is formed by connecting a plurality of herringbone substructures in a symmetrical alternating mode; each herringbone substructure comprises a vertex and side edges symmetrically extending to the two sides from the vertex; wherein an end arc protruding outwards is formed at the vertex; each of the side edges includes an arcuate chamfer extending from an end arc and a straight segment.

Description

Technical Field

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

[0002] Cardiovascular disease (CVD) is one of the major health problems in the world, and coronary stents are widely used to treat coronary artery lesions. However, traditional metal stents may cause vascular restenosis and other problems due to their non-degradability, so degradable biomaterial stents have become a development trend in this field. Polylactic acid (PLLA), as a biodegradable polymer, is used in the design of degradable stents due to its good biocompatibility and degradation properties.

[0003] The structural design of the PLLA stent in the prior art ignores the synergistic effect of the stent's overall structure, support ring and connector. This results in poor radial mechanical properties, morphology and stability during the crimping process, which affects the clinical application effect of the stent. In addition, for patients with plaques, vascular stenosis and other conditions in their blood vessels, the existing general vascular stent structure is difficult to adapt to and meet their special conditions and needs.

[0004] The Chinese utility model patent, announcement number CN201564638U, utility model name "A degradable vascular stent", discloses a degradable vascular stent, including a strip, and a latch and lock structure at the connecting end of the strip, which is used to fix the strip into a cylindrical shape. The strip of this structure is only connected longitudinally at the connecting end, resulting in uneven force on the structure, easy deformation, and when it is delivered to the blood vessel, the sharp latch has the risk of damaging the blood vessel.

[0005] The Chinese utility model patent, CN206761807U, the utility model name is "degradable spiral vascular stent", which discloses a spiral vascular stent. The spiral vascular stent is in the form of circular threads evenly arranged in the longitudinal direction, has poor radial resilience, brings difficulties during installation and implantation, and cannot meet the individual differences of blood vessels with lesions or special conditions.

[0006] Therefore, there is a need in the art for an improved degradable vascular stent that can be easily and safely implanted, has uniform force and minimizes stress concentration, and can adapt to different vascular lesions to provide safe and effective vascular support effects. Summary of the invention

[0007] In view of the problems that the mechanical properties of the degradable vascular stent structure in the prior art are insufficient, the present invention provides a degradable vascular stent, which greatly improves the structural properties of the degradable vascular stent.

[0008] The present invention provides a degradable vascular stent, which is in the shape of an elongated cylinder and comprises: a plurality of support rings arranged in parallel with each other in the longitudinal direction of the degradable vascular stent, and a plurality of connectors connecting the support rings adjacent to each other in the longitudinal direction; wherein the support rings are corrugated and extend in the circumferential direction to form a ring, and the support rings are composed of a plurality of herringbone-shaped substructures connected in a symmetrical and alternating manner; the herringbone-shaped substructures comprise a vertex, and side edges extending symmetrically to both sides from the vertex; wherein an end circular arc protruding outward is formed at the vertex; and each of the side edges comprises a circular arc chamfer and a straight line segment extending from the end circular arc.

[0009] Optionally, the ratio of the longitudinal length of the connector to the longitudinal length of the support ring is 2.4 to 2.8 times; the ratio of the circumferential width of the connector to the width of the strip material of the support ring is 0.6 to 1.2 times.

[0010] Optionally, the connectors between longitudinally adjacent support rings constitute a connector density zone and a connector sparse zone; wherein the connector density zone has 6 connectors between longitudinally adjacent support rings; and the connector sparse zone has 3 connectors between longitudinally adjacent support rings.

[0011] Optionally, the support ring includes 12 herringbone-shaped substructures; in the connector dense area, the connectors adjacent to each other in the circumferential direction are spaced apart by one end arc; in the connector sparse area, the connectors adjacent to each other in the circumferential direction are spaced apart by three end arcs.

[0012] Optionally, the degradable vascular stent has two connector densification areas, which are arranged at two longitudinal ends thereof; and a connector sparse area is between the connector densification areas at the two ends.

[0013] Optionally, the degradable vascular stent includes 8 support rings, 2 connector density areas and 5 connector sparse areas; wherein the 2 connector density areas are respectively arranged between the third support ring and the fourth support ring at the longitudinal left end of the degradable vascular stent, and between the fifth support ring and the sixth support ring at the longitudinal left end; the positions between the other support rings are connector sparse areas.

[0014] Optionally, the degradable vascular stent includes 8 support rings, 3 connector density areas and 4 connector sparse areas; wherein the 3 connector density areas are respectively arranged between the first support ring and the second support ring at the longitudinal left end of the degradable vascular stent, between the fourth support ring and the fifth support ring, and between the seventh support ring and the eighth support ring; the positions between the other support rings are connector sparse areas.

[0015] Optionally, the connector is a double Y-shaped connector, including a middle part, and ends whose cross-sectional dimensions gradually expand from the middle part to both ends; wherein the ends of the double Y-shaped connector are respectively connected to the corresponding end arcs of two longitudinally adjacent support rings; the cross-sectional dimension of the middle part of the double Y-shaped connector is smaller than the cross-sectional dimensions at both ends.

[0016] Optionally, the connector is a convex connector, including vertical portions at both ends, and multiple arc portions connecting the vertical portions; wherein the ends of the vertical portions of the convex connector are respectively connected to the corresponding end arcs of two longitudinally adjacent support rings; the multiple arc portions include a first arc segment with a radius of R1, a second arc segment with a radius of R2, a third arc segment with a radius of R3, and a fourth arc segment with a radius of R4, which are connected in sequence.

[0017] Optionally, the radius R2 of the second arc segment is greater than the radius R1 of the first arc segment, and the radius R3 of the third arc segment is greater than the radius R4 of the fourth arc segment.

[0018] Compared with the prior art, the degradable vascular stent provided by the present invention has at least the following beneficial effects.

[0019] (1) Compared with the existing degradable vascular stent structure, the degradable vascular stent structure proposed in the present invention has the advantages of simple structure and convenient processing and manufacturing.

[0020] (2) The polylactic acid vascular stent structural design proposed in the present invention can significantly improve the radial mechanical properties and compression and grip performance of the stent, reduce the damage or destruction of the support ring during the compression and expansion process, and improve the long-term clinical effect.

[0021] (3) The present invention rationally designs the geometry of the support ring and connector of the stent, strengthens the mutual coordination mechanism between the support ring and the connector, and can make the deformation mode of the vascular stent more ideal during the compression and expansion process, thereby reducing the damage caused by stress concentration.

[0022] (4) The connector densification area and connector sparse layout provided by the present invention can ensure that the deformation mode of the degradable vascular stent is more regular during the compression, gripping and expansion process, thereby improving the radial mechanical properties of the degradable vascular stent and ensuring good bending performance.

[0023] (5) The various layouts of the connector densification area and the connector sparseness provided by the present invention can respectively meet the needs of patients with different vascular conditions and provide a more accurate and effective vascular support effect that adapts to individual differences.

[0024] (6) The double Y-shaped connector and the male connector proposed in the present invention can reduce the damage to the support ring and improve the bending performance of the stent. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. The features and advantages of the present invention can be more clearly understood by referring to the drawings. The drawings are schematic and should not be understood as limiting the present invention in any way. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 Schematic diagram of a degradable vascular stent provided according to a first embodiment of the present invention.

[0027] Figure 2 It is a schematic diagram of the deployment of the degradable vascular stent provided according to the first embodiment of the present invention.

[0028] Figure 3 It is an expanded and enlarged schematic diagram of a single substructure of the degradable vascular stent provided according to the first embodiment of the present invention.

[0029] Figure 4a Schematic diagram of a degradable vascular stent provided according to a second embodiment of the present invention.

[0030] Figure 4b Schematic diagram of the deployment of a degradable vascular stent provided according to the second embodiment of the present invention.

[0031] Figure 5a Schematic diagram of a degradable vascular stent provided according to a third embodiment of the present invention.

[0032] Figure 5b Schematic diagram of the deployment of a degradable vascular stent provided according to the third embodiment of the present invention.

[0033] Figure 6a Schematic diagram of a degradable vascular stent provided according to a fourth embodiment of the present invention.

[0034] Figure 6b Schematic diagram of the deployment of a degradable vascular stent provided according to the fourth embodiment of the present invention.

[0035] Figure 7 Schematic diagram of a double Y-shaped connector of a degradable vascular stent provided according to a fifth embodiment of the present invention.

[0036] Figure 8 Schematic diagram of a male connector of a degradable vascular stent provided according to a sixth embodiment of the present invention.

[0037] Fig. 9It is a partially enlarged schematic diagram of a male connector of a degradable vascular stent provided according to a sixth embodiment of the present invention.

[0038] Reference numerals: 1. Support ring; 2. Connector; 3. Sawtooth wave center line; 4. Straight line segment; 5. Arc chamfer; 6. End arc; 7. Axis of symmetry; 8. Inscribed circle of sawtooth wave center line; 9. Connector encrypted area; 10. Connector sparse area; 14. Double Y-shaped connector; 15. Male connector; 15-1. First arc segment; 15-2. Second arc segment; 15-3. Third arc segment; 15-4. Fourth arc segment; 15-5. Vertical portion. DETAILED DESCRIPTION

[0039] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0040] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0041] A degradable vascular stent provided according to an embodiment of the present invention is described in detail below with reference to the accompanying drawings.

[0042] The degradable vascular stent provided by the present invention comprises an improved support ring and a connector, which solves the problem of insufficient mechanical properties of the polylactic acid vascular stent and provides a polylactic acid material degradable vascular stent with excellent mechanical properties.

[0043] like Figure 1 and Figure 2 As shown, according to the first embodiment of the present invention, a degradable vascular stent is provided, which is made of polylactic acid material and includes a plurality of support rings 1 and a plurality of connectors 2, wherein the support rings 1 are corrugated and extend circumferentially to form a ring, and the connectors 2 connect the support rings 1 adjacent to each other in the longitudinal direction. Figure 1 As shown, the degradable vascular stent of this embodiment is in a long cylindrical shape in a normal state such as a use state, with its circular ring direction being the circumferential direction and its elongated extension direction being the longitudinal direction. Optionally, the degradable vascular stent may include 6 to 12 support rings 1, and adjacent support rings 1 are connected by a plurality of connectors 2 to form a long cylindrical degradable vascular stent. Optionally, two adjacent support rings 1 in the longitudinal direction may be connected by 2 to 8 connectors 2. For example, Figure 2The planar expansion diagram of the degradable vascular stent provided by this embodiment is shown, and adjacent support rings 1 can be connected by three connectors 2, and the connectors 2 are arranged alternately in the longitudinal direction. Optionally, the total length of the degradable vascular stent can be set according to the length or size of the plaque of the stent user; the outer diameter of the degradable vascular stent can be set according to the blood vessel diameter of the stent user. Optionally, the arrangement of the connectors 2 of the support rings 1 of the degradable vascular stent can also be encrypted as needed, for example, it can be encrypted according to the size of the plaque of the stent user detected. Optionally, the support rings 1 are arranged parallel to each other in the longitudinal direction of the degradable vascular stent, and the spacing distances between the longitudinally adjacent support rings 1 are the same. Optionally, the degradable vascular stent can be formed integrally.

[0044] refer to Figure 1 The connector 2 of the degradable vascular stent in this embodiment has a length L in the longitudinal direction and a width T2 in the circumferential direction.

[0045] Continue to refer Figure 1 , the length of the corrugated support ring 1 in the longitudinal direction is H, and the width of the strip material forming the support ring 1 is T1. Figure 3 The expanded view of the substructure of the support ring 1 of the degradable vascular stent provided in this embodiment is shown. The support ring 1 of the degradable vascular stent can be composed of the substructures continuously arranged in a ring shape in a symmetrical and alternating manner.

[0046] The length of the sawtooth wave center line 3 along the circumference of the degradable vascular stent is the circumference of the degradable vascular stent, and twice the amplitude of the sawtooth wave center line 3 is the length H of the support ring along the longitudinal direction. The specific size of the sawtooth wave can be calculated from the total length of the degradable vascular stent, the outer diameter of the degradable vascular stent, the proportional relationship between H and L, and the width T1 of the strip material of the support ring.

[0047] like Figure 3 As shown, the substructure of the support ring 1 of the degradable vascular stent is based on the sawtooth wave center line 3, and the sawtooth wave center line 3 is a triangle. The substructure of the support ring 1 is a generally herringbone structure, including a vertex, and is symmetrical about a symmetry axis 7 extending longitudinally from the vertex. The symmetry axis 7 is parallel to the central axis of the degradable vascular stent. Specifically, the substructure of the support ring 1 is a generally herringbone structure, including a vertex, and side edges extending symmetrically from the vertex to both sides; wherein an end arc 6 protruding outward is formed at the vertex; the side edge may include a straight line segment 4, and an arc chamfer 5 connecting the end arc 6 of the vertex and the straight line segment 4. The protrusion direction of the arc chamfer 5 is toward the inside of the herringbone structure of the substructure. See. Figure 2The support ring 1 includes a plurality of substructures connected in a symmetrical alternating manner, that is, each substructure is inverted with respect to the adjacent substructure in the longitudinal direction, so that the end arc 6, the arc chamfer 5 and the straight line segment 4 are connected in sequence and continuously to form a corrugated structure.

[0048] Continue to refer Figure 3 The straight line segment 4 is equidistantly offset from the sawtooth wave center line 3 to both sides by half the width of the support ring 1 The arc chamfer 5 connects the straight line segment 4 and the end arc 6, and the end arc 6 is translated upward and downward by half the width of the support ring 1 by the inscribed circle 8 of the sawtooth wave centerline. It is obtained that the end arc 6 is connected to the straight line segment 4 through the arc chamfer 5, and the end arc 6 protrudes above the vertex of the substructure. The radius of the inscribed circle 8 of the sawtooth wave centerline is R, and the size of the radius R can be set according to the cross-sectional radius of the degradable vascular stent. For example, the range of the radius R can be set to 0.2mm to 0.6mm as required. The strip material forming the support ring 1 has a consistent width T1, that is, the end arc 6, the straight line segment 4 and the arc chamfer 5 of the support ring 1 have the same width. For example, Figure 3 The left side portion of the substructure shown includes, from top to bottom, an end arc 6, an arc chamfer 5, a straight line segment 4, an arc chamfer 5 and an end arc 6, which is composed of a total of 4 arc segments and a straight line segment 4. In this embodiment, the straight line segment 4 is configured such that the projected length on the central axis of the degradable vascular stent should be less than 1 / 5 of the length H of the support ring 1.

[0049] The corrugated support ring 1 extending in the circumferential direction can be formed by alternately connecting the above substructures with the symmetrical substructures to form a closed circumferential ring structure. The support ring 1 including the substructures of the end arc 6, the straight line segment 4, and the arc chamfer 5 connecting the end arc 6 and the straight line segment 4 can make the various parts of the degradable vascular stent of this embodiment more smooth, thereby ensuring the safety of the degradable vascular stent in use.

[0050] Continue to refer Figure 1 and Figure 2 The degradable vascular stent of the first embodiment can connect the corrugated support rings 1 adjacent in the longitudinal direction through the connector 2 to form a cylindrical structure extending in the longitudinal direction. The adjacent corrugated support rings 1 are arranged parallel to each other, and the connector 2 can be connected at the end arcs 6 of the support rings 1, and each connector 2 connects the corresponding end arcs 6 of the adjacent support rings 1 in the longitudinal direction. In the first embodiment, a complete support ring 1 includes 12 substructures, that is, 12 end arcs 6. It should be understood that, according to needs, in other embodiments, the support ring 1 can be formed by connecting more or fewer substructures in a symmetrical alternating manner.

[0051] In this embodiment, on the circumferential corrugated support ring 1, the connector 2 is connected to the support ring 1 in a manner of three end arcs 6 apart. Figure 2 As shown, the connector 2 is alternately spaced apart from each other at the position where it is connected to the first corrugated support ring 1 and the second corrugated support ring 1 at the left end, and at the position where it is connected to the second corrugated support ring 1 and the third corrugated support ring 1. In other words, the connection position of the connector 2 connecting the first and second corrugated support rings 1 and the second corrugated support ring 1, and the connection position of the connector 2 connecting the second and third corrugated support rings 1 and the second corrugated support ring 1, are each spaced apart by an end arc 6. The arrangement of the connector 2 between other longitudinally adjacent connecting rings 2 of the degradable vascular stent is similar. The degradable vascular stent with the above-mentioned structure can ensure uniform overall force and avoid deformation and damage caused by local force concentration.

[0052] Optionally, the ratio of the length L of the connector 2 to the length H of the support ring 1 can be set in the range of 2.4-2.8, and the ratio of the width T2 of the connector 2 to the width T1 of the support ring 1 can be set in the range of 0.6-1.2, so that the compression and gripping performance of the degradable vascular stent is better and the compression and gripping deformation mode is more regular, thereby ensuring that the degradable stent causes less damage to the blood vessel wall after being expanded.

[0053] In order to further improve the mechanical properties of the degradable vascular stent and adapt to the needs of different patients, the degradable vascular stent according to another embodiment of the present invention is described below.

[0054] like Figure 4a and Figure 4b As shown, a schematic diagram and a planar development diagram of a degradable vascular stent according to a second embodiment of the present invention are shown. The degradable vascular stent provided by this embodiment includes a plurality of corrugated support rings 1, and connectors 2 connecting longitudinally adjacent corrugated support rings 1, wherein the connectors 2 between two adjacent corrugated support rings 1 constitute a connector density area 9 and a connector sparse area 10 according to the number. In this embodiment, the connector density area 9 is 3 connectors 2 with uniform spacing between two adjacent corrugated support rings 1, and the connector sparse area 10 is 6 connectors 2 with uniform spacing between two adjacent corrugated support rings 1. In this embodiment, the connector density area 9 is set at the longitudinal ends of the degradable vascular stent, and the connector sparse area 10 is set in the middle area. The connector sparse area 10 in the middle area is staggered with each other following the positions of the connectors 2 of the longitudinally adjacent connector sparse areas 10.

[0055] like Figure 4a and Figure 4bAs shown, the degradable vascular stent of this embodiment includes two connector densification areas 9, which are arranged at the longitudinal left end and the longitudinal right end of the degradable vascular stent, that is, the connector densification area 9 is between the first corrugated support ring 1 and the second corrugated support ring 1 on the longitudinal left, and the connector densification area 9 is between the last corrugated support ring 1 and the adjacent corrugated support ring 1 on the longitudinal left. Between the connector densification areas 9 at both ends is a connector sparse area 10. The corrugated support ring 1 includes 12 end arcs 6. In the connector densification area 9, the number of connectors 2 between the longitudinally adjacent support rings 1 is set to 6, and the circumferentially adjacent connectors 2 are spaced by 1 end arc 6. In the connector sparse area 10, the number of connectors 2 between the longitudinally adjacent support rings 1 is set to 3, and the circumferentially adjacent connectors 2 are spaced by 3 end arcs 6. Figure 4a and Figure 4b As shown, the degradable vascular stent of this embodiment includes 8 corrugated support rings 1. However, in other embodiments, more or fewer corrugated support rings 1 may be provided as required.

[0056] The arrangement of the second embodiment is conducive to reducing the dog-bone effect of the degradable vascular stent, improving the compression deformation of the stent, and having little effect on the bending performance (flexibility) of the stent. Other aspects of the second embodiment, such as the structure of the corrugated support ring 1 and its substructures, are similar to those of the first embodiment and will not be described in detail here.

[0057] like Figure 5a and Figure 5b As shown, a schematic diagram and a planar development diagram of a degradable vascular stent according to the third embodiment of the present invention are shown. The degradable vascular stent provided in the third embodiment includes a connector density area 9 arranged in the longitudinal middle of the degradable vascular stent. Specifically, the degradable vascular stent of this embodiment includes 8 support rings 1, 2 connector density areas 9, and 5 connector sparse areas 10; wherein the connector density area 9 is between the third support ring 1 and the fourth support ring 1 at the left end in the longitudinal direction, and the connector density area 9 is between the fifth support ring 1 and the sixth support ring 1 at the left end, and the other positions are connector sparse areas 10. In the connector density area 9, the number of connectors 2 between adjacent support rings 1 is set to 6, and an end arc 6 is spaced between adjacent connectors 2 in the circumferential direction. In the connector sparse area 10, there are 3 connectors 2 arranged between adjacent support rings 1, and 3 end arcs 6 are spaced between adjacent connectors 2 in the circumferential direction.

[0058] The arrangement of the third embodiment is conducive to improving the compression and gripping deformation of the degradable stent and can effectively prevent the degradable stent from collapsing during long-term use. Other aspects of the third embodiment, such as the structure of the corrugated support ring 1 and its substructures, are similar to those of the first embodiment and will not be described in detail here.

[0059] like Figure 6a and Figure 6b As shown, a schematic diagram and a planar development diagram of a degradable vascular stent according to the fourth embodiment of the present invention are shown. The degradable vascular stent provided by the fourth embodiment includes a connector density area 9 provided in the longitudinal middle and both ends of the degradable vascular stent. Specifically, the degradable vascular stent of this embodiment includes 8 support rings 1, 3 connector density areas 9 and 4 connector sparse areas 10; wherein, the connector density area 9 is between the first support ring 1 and the second support ring 1 at the longitudinal left end, the connector density area 9 is between the fourth support ring 1 and the fifth support ring 1, the connector density area 9 is between the seventh support ring 1 and the eighth support ring 1, and the other parts are connector sparse areas 10. Among them, in the connector density area 9, the number of connectors 2 between adjacent support rings 1 is set to 6, and one end arc 6 is spaced between adjacent connectors 2 in the circumferential direction. In the connector sparse area 10, the number of connectors 2 between adjacent support rings 1 is set to 3, and 3 end arcs 6 are spaced between adjacent connectors 2 in the circumferential direction.

[0060] The arrangement of the fourth embodiment can significantly improve the compression and gripping performance of the degradable vascular stent, and effectively enhance the supporting performance of the degradable vascular stent.

[0061] like Figure 7 As shown, a schematic diagram of another connector of a degradable vascular stent according to the fifth embodiment of the present invention is shown. In order to further improve the bending performance of the stent, this embodiment provides a double Y-shaped connector 14. The double Y-shaped connector 14 includes a middle part, and end parts whose cross-sectional dimensions gradually expand from the middle part to both ends, forming a double Y-shaped structure that is spliced ​​approximately symmetrically, and the ends of the double Y-shaped connector 14 are respectively connected to the corresponding end arcs 6 of two longitudinally adjacent support rings 1. Among them, the cross-sectional dimensions of the middle part of the double Y-shaped connector 14 are smaller than the cross-sectional dimensions of the two ends. The double Y-shaped connector 14 provided in the fifth embodiment has a significant effect on improving the bending performance of the degradable vascular stent.

[0062] like Figure 8 and Fig. 9As shown, a schematic diagram of another connector of a degradable vascular stent according to the sixth embodiment of the present invention is shown. In order to further improve the bending performance of the stent, this embodiment provides a convex connector 15 that protrudes in a lateral direction perpendicular to the central axis of the degradable vascular stent. The connector 15 is composed of vertical portions 15-5 at both ends, and multiple arc portions between the vertical portions 15-5 are continuously connected, and the vertical portions 15-5 are respectively connected to the corresponding end arcs 6 of two longitudinally adjacent support rings 1. Specifically, the multiple arc portions include a first arc segment 15-1 with a radius of R1, a second arc segment 15-2 with a radius of R2, a third arc segment 15-3 with a radius of R3, and a fourth arc segment 15-4 with a radius of R4, which are connected in sequence. Specifically, the multiple arc portions can be configured to include: a fourth arc segment 15-4 in the middle, and a third arc segment 15-3, a second arc segment 15-2 and a first arc segment 15-1 extending symmetrically to both sides thereof. Among them, the adjacent arc segments are tangent at the intersection, so that the multiple arc segments are smoothly connected, and the protrusion directions of the adjacent arc segments are opposite, for example, the first arc segment 15-1 with a radius of R1 protrudes to the left, the second arc segment 15-2 with a radius of R2 protrudes to the right, the third arc segment 15-3 with a radius of R3 protrudes to the left, and the fourth arc segment 15-4 with a radius of R4 protrudes to the right. Optionally, the sizes of the radii R1, R2, R3 and R4 can be set to increase first and then decrease, that is, the sizes of the radii R2 and R3 are greater than the sizes of the radii R1 and R4. In other words, the male connector 15 of this embodiment includes a middle portion protruding toward one side of the circumference of the degradable vascular stent, and vertical portions 15-5 extending from the middle portion to both ends, respectively, and the ends of the two vertical portions 15-5 of the male connector 15 are respectively connected to the corresponding end arcs 6 of the two longitudinally adjacent support rings 1. The male connector 15 provided in the sixth embodiment has a significant effect on improving the bending performance of the degradable vascular stent.

[0063] All the above optional technical solutions can be arbitrarily combined to form optional embodiments of the present application, which will not be described one by one here.

[0064] It should be understood that the order of execution of the steps in the above embodiment does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present invention.

[0065] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A degradable vascular stent, characterized in that: The degradable blood vessel stent is in the shape of a long cylinder and comprises: a plurality of support rings arranged parallel to each other in the longitudinal direction of the degradable blood vessel stent, and a plurality of connectors connecting the support rings adjacent to each other in the longitudinal direction; The support ring is corrugated and extends in the circumferential direction to form a ring, and the support ring is composed of a plurality of herringbone substructures connected in a symmetrical and alternating manner; The herringbone substructure comprises a vertex and side edges extending symmetrically from the vertex to both sides; an end circular arc protruding outward is formed at the vertex; each of the side edges comprises a circular arc chamfer and a straight line segment extending from the end circular arc.

2. The degradable vascular stent according to claim 1, characterized in that: The ratio of the length of the connector in the longitudinal direction to the length of the support ring in the longitudinal direction is 2.4 to 2.8 times; The ratio of the width of the connector in the circumferential direction to the width of the strip material of the support ring is 0.6 to 1.2 times.

3. The degradable vascular stent according to claim 1, characterized in that: The connectors between the longitudinally adjacent support rings constitute a connector density area and a connector sparse area; Wherein, the connector encryption area has 6 connectors between longitudinally adjacent support rings; The connector sparse area has three connectors between longitudinally adjacent support rings.

4. The degradable vascular stent according to claim 3, characterized in that: The support ring includes 12 herringbone-shaped substructures; In the connector densification area, adjacent connectors in the circumferential direction are spaced apart by an end arc; In the connector sparse area, connectors adjacent to each other in the circumferential direction are spaced apart by three end arcs.

5. The degradable vascular stent according to claim 3, characterized in that: The degradable blood vessel stent has two connector density areas, which are arranged at two longitudinal ends thereof; and a connector sparse area is between the connector density areas at the two ends.

6. The degradable vascular stent according to claim 3, characterized in that: The degradable vascular stent comprises 8 support rings, 2 connector dense areas and 5 connector sparse areas; Among them, the two connector encrypted areas are respectively arranged between the third support ring and the fourth support ring at the longitudinal left end of the degradable vascular stent, and between the fifth support ring and the sixth support ring at the longitudinal left end; the positions between the other support rings are connector sparse areas.

7. The degradable vascular stent according to claim 3, characterized in that: The degradable vascular stent comprises 8 support rings, 3 connector dense areas and 4 connector sparse areas; Among them, the three connector encrypted areas are respectively arranged between the first support ring and the second support ring at the longitudinal left end of the degradable vascular stent, between the fourth support ring and the fifth support ring, and between the seventh support ring and the eighth support ring; the positions between the other support rings are connector sparse areas.

8. The degradable vascular stent according to claim 1, characterized in that: The connector is a double Y-shaped connector, comprising a middle portion, and ends whose cross-sectional dimensions gradually expand from the middle portion to both ends; Wherein, the ends of the double Y-shaped connector are respectively connected to the corresponding end arcs of two longitudinally adjacent support rings; The cross-sectional dimensions of the middle portion of the double Y-shaped connector are smaller than the cross-sectional dimensions of the two ends.

9. The degradable vascular stent according to claim 1, characterized in that: The connector is a male connector, comprising vertical parts at both ends and multiple arc parts connecting the vertical parts; wherein the ends of the vertical portion of the male connector are respectively connected to corresponding end arcs of two longitudinally adjacent support rings; The multiple arc sections include a first arc segment with a radius R1, a second arc segment with a radius R2, a third arc segment with a radius R3, and a fourth arc segment with a radius R4 which are connected in sequence.

10. The degradable vascular stent according to claim 9, characterized in that: The radius R2 of the second arc segment is greater than the radius R1 of the first arc segment, and the radius R3 of the third arc segment is greater than the radius R4 of the fourth arc segment.

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