Absorbable vascular stent

Abstract

The application provides an absorbable vascular stent. The absorbable vascular stent comprises at least one stopper and at least two double helix groups. Any helical coil is coaxial with and mirror-imaged to another helical coil, so that each half turn of the two helical coils intersects to form a connection point. Each helical coil of one double helix group is arranged along the axial direction of the helical coil of any double helix group, so that all the connection points in the two double helix groups are arranged one by one and along the axial direction of the helical coil of any double helix group, and each half turn of each helical coil of the two double helix groups intersects to form a fixed point. The stopper is connected to the connection point in one double helix group, and the stopper is configured to be locked at the corresponding connection point in another double helix group when the helical coil of each double helix group is elongated. The absorbable vascular stent has good support stability and good adhesion to the blood vessel wall.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to an absorbable vascular stent. Background Technology

[0002] Bioresorbable Vascular Stents Scaffolds (BVS) can provide temporary support through biodegradation and gradually disappear, allowing blood vessels to restore their natural physiological functions. However, compared with metal stents, absorbable vascular stents have problems such as low radial mechanical properties and high rebound rate after support. For example, the utility model patent application with application number CN201520403342.8 makes each group of annular support rings composed of multiple basic units similar to sine waves connected together, with adjacent groups of connectors arranged in a staggered pattern. That is, the basic units of sine waves are used to enhance the radial support force of the vascular stent, but its support stability is poor, and it will still retract after the balloon is released. Another example is the invention patent application with application number CN202411592001, which uses support rings made of arc units of different shapes connected together and uses zinc alloy material to make support rings, realizing the use of zinc alloy as the main structure. This improves the mechanical support of the vascular stent, but it is limited to materials with high structural strength such as zinc alloy. However, the support ring made of zinc alloy material will affect the adhesion between the absorbable vascular stent and the blood vessel wall. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide an absorbable vascular stent with better support stability and better adhesion to the blood vessel wall.

[0004] The objective of this utility model is achieved through the following technical solution:

[0005] An absorbable vascular stent, comprising:

[0006] At least two double helix sets, each of the double helix sets comprising two helical loops, each of the helical loops being configured to be coaxial and mirror-oriented with the other helical loop, such that each half-turn of the two helical loops intersects to form a connection point;

[0007] Each of the spiral coils of one of the double helix groups and each of the spiral coils of the other double helix group are arranged along the axial direction of the spiral coils of any double helix group, so that all the connection points in the two double helix groups are set in a one-to-one correspondence and arranged along the axial direction of the spiral coils of any double helix group, and each of the spiral coils of the two double helix groups intersects every half turn to form a fixed point.

[0008] At least one stop is connected to the connection point in one of the double helix groups, and the stop is configured to lock at the corresponding connection point in another double helix group as the spiral loop of each of the double helix groups extends.

[0009] In one embodiment, the number of stops is equal to the number of turns of the spiral coil in one of the double helix groups, each stop is connected at a connection point of each turn of the spiral coil in one of the double helix groups, and each stop is configured to lock at a corresponding connection point in another double helix group as the spiral coil in each of the double helix groups extends.

[0010] In one embodiment, the number of stops is equal to twice the number of turns of the spiral coil in each of the double helix groups, each stop is connected at the connection point of each half turn of the spiral coil in one of the double helix groups, and each stop is configured to lock at the corresponding connection point in the other double helix group as the spiral coil in each of the double helix groups extends.

[0011] In one embodiment, the number of stops is greater than the number of spiral coils in one of the double helix groups but less than twice the number of spiral coils in one of the double helix groups. Some of the stops are connected to one of the connection points of each spiral coil in one of the double helix groups, and the remaining stops are connected to each of the remaining connection points in the double helix group. Each stop is configured to lock at the corresponding connection point in the other double helix group when the spiral coil in each double helix group is extended.

[0012] In one embodiment, the stop member and the corresponding spiral ring of the double helix assembly are integrally formed.

[0013] In one embodiment, the distance between the two corresponding connection points in the two double helix groups is greater than half the pitch of the helical loop of either double helix group and less than the pitch of the helical loop of either double helix group.

[0014] In one embodiment, a through hole is provided at each connection point of the double helix assembly, and the stop member passes through the corresponding through hole in the corresponding double helix assembly. A stop groove is provided on the wall of each through hole.

[0015] The stop member has a protruding stop block on its peripheral wall, and the stop block is configured to lock into the corresponding stop groove in the corresponding double helix group when the spiral coil of each double helix group is extended.

[0016] In one embodiment, one end of the stop is connected to the connection point in one of the double helix groups;

[0017] The stop block has a wedge-shaped surface, which is positioned facing the other end of the stop member and away from the stop member.

[0018] In one embodiment, the stop block and the stop member are integrally formed.

[0019] In one embodiment, one end of the stop is connected to the connection point in one of the double helix groups, and the end face of the other end of the stop is a spherical surface.

[0020] In one embodiment, the two end faces of each helical loop of each of the double helical groups are spherical end faces.

[0021] In one embodiment, each of the spiral coils of each of the double helical groups includes a polylactic acid-based spiral coil body and an alloy coating, the alloy coating covering the surface of the polylactic acid-based spiral coil body;

[0022] The alloy coating is either a magnesium alloy coating or a zinc alloy coating.

[0023] In one embodiment, each of the spiral coils in each of the double helix groups is a polylactic acid-based spiral coil, a magnesium alloy spiral coil, or a zinc alloy spiral coil.

[0024] Compared with the prior art, the present invention has at least the following advantages:

[0025] The absorbable vascular stent of this invention comprises two helical coils in each double-helix group. Each helical coil is configured to be coaxial and mirror-image of the other helical coil. Each helical coil of one double-helix group and each helical coil of the other double-helix group are arranged along the axial direction of the helical coils of the first double-helix group, ensuring that at least four helical coils are not overlapping but are coaxial and mirror-image in pairs, forming the main support structure of the absorbable vascular stent. The helical coils have good flexibility and bending adaptability, improving the fit with the vascular wall. Furthermore, each half-turn of the two helical coils intersects to form a connection point, and each of the two double-helix groups... Each half-turn of the spiral coil intersects to form a fixed point. Thus, each half-turn of the spiral coil contains two connection points and two fixed points. The expansion and contraction of each spiral coil are directly related to the distance between the two connection points and the distance between the two fixed points. With the stop connected to the connection point in one of its double spiral groups, and the stop configured to lock at the corresponding connection point in another double spiral group when the spiral coil in each double spiral group extends, the distance between the two connection points is locked, and the distance between the two fixed points is also locked. This effectively locks the contraction of each spiral coil, improving the support stability of the absorbable vascular stent. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of an absorbable vascular stent according to one embodiment of the present invention;

[0028] Figure 2 for Figure 1 A partial view of the absorbable vascular stent shown.

[0029] Figure 3 for Figure 1 A partial cross-sectional view of the absorbable vascular stent shown.

[0030] Figure 4 for Figure 3 A magnified view of part A of the absorbable vascular stent shown. Detailed Implementation

[0031] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0032] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0034] This application provides an absorbable vascular stent. The absorbable vascular stent includes at least one stop and at least two double-helix assemblies. Each double-helix assembly includes two helical coils, one helical coil being configured coaxially and mirror-image of the other helical coil, such that each half-turn of the two helical coils intersects to form a connection point. Each helical coil of one double-helix assembly and each helical coil of the other double-helix assembly are arranged along the axial direction of the helical coil of the first double-helix assembly, such that all connection points in the two double-helix assemblies are correspondingly arranged along the axial direction of the helical coils of the first double-helix assembly, and each half-turn of the helical coils of the two double-helix assemblies intersects to form a fixing point. The stop is connected to the connection point in one double-helix assembly, and the stop is configured to lock at the corresponding connection point in the other double-helix assembly when the helical coil of each double-helix assembly extends.

[0035] The aforementioned absorbable vascular stent comprises two helical coils in each double-helix assembly. Each helical coil is configured to be coaxial and mirror-image of the other. Each helical coil in one double-helix assembly and each helical coil in the other double-helix assembly are arranged along the axial direction of the helical coil in any double-helix assembly, ensuring that at least four helical coils are not overlapping but are coaxial and mirror-image in pairs, forming the main support structure of the absorbable vascular stent. The helical coils possess good flexibility and bending adaptability, improving the fit to the vascular wall. Furthermore, each half-turn of the two helical coils intersects to form a connection point, and each helical coil of the two double-helix assemblies... The spiral coils intersect at fixed points in half-turns, thus each half-turn contains two connection points and two fixed points. The expansion and contraction of each spiral coil are directly related to the distance between the two connection points and the distance between the two fixed points. A stopper connects to the connection point in one of the double spiral groups, and is configured to lock at the corresponding connection point in another double spiral group when the spiral coil in each double spiral group extends. This locks the distance between the two connection points and the distance between the two fixed points, effectively preventing the contraction of each spiral coil and improving the support stability of the absorbable vascular stent.

[0036] To better understand the absorbable vascular stent of this application, the following further explanation is provided:

[0037] Please refer to the following: Figures 1 to 4 One embodiment of the absorbable vascular stent 10 includes at least one stop 200 and at least two double-helix assemblies 100. Each double-helix assembly 100 includes two helical coils 110, one helical coil 110 being configured coaxially and mirror-image of the other helical coil 110, such that each half-turn of the two helical coils 110 intersects to form a connection point 101. Each helical coil 110 of one double-helix assembly 100 and each helical coil 110 of the other double-helix assembly 100 are arranged along the axial direction of the helical coil 110 of the first double-helix assembly 100, such that all connection points 101 in the two double-helix assemblies 100 are correspondingly arranged and along the axial direction of the helical coil 110 of the first double-helix assembly 100, and each half-turn of the helical coil 110 of the two double-helix assemblies 100 intersects to form a fixing point 102. The stop 200 is connected to the connection point 101 in one of its double helix sets 100, and the stop 200 is configured to lock at the corresponding connection point 101 in the other double helix set 100 when the spiral coil 110 of each double helix set 100 is extended.

[0038] The aforementioned absorbable vascular stent 10 comprises two helical coils 110 in each double helix assembly 100. Each helical coil 110 is configured to be coaxial and mirror-image of the other helical coil 110. Each helical coil 110 of one double helix assembly 100 and each helical coil 110 of the other double helix assembly 100 are arranged along the axial direction of the helical coil 110 of the double helix assembly 100. This ensures that at least four helical coils 110 are not overlapping, but are coaxial and mirror-image in pairs, forming the main support structure of the absorbable vascular stent 10. The helical coils 110 have good flexibility and bending adaptability, improving the fit to the vascular wall. Furthermore, each half-turn of the two helical coils 110 intersects to form a connection point 101, and each helical coil 110 of the two double helix assemblies 100... Each half-turn of the spiral coil 110 intersects to form a fixed point 102. Thus, each half-turn of the spiral coil 110 contains two connection points 101 and two fixed points 102. The expansion and contraction of each spiral coil 110 are directly related to the distance between the two connection points 101 and the distance between the two fixed points 102. The stop member 200 is connected to the connection point 101 in one of the double spiral groups 100. The stop member 200 is configured to lock at the corresponding connection point 101 in the other double spiral group 100 when the spiral coil 110 of each double spiral group 100 extends. This achieves the locking of the distance between the two connection points 101 and the distance between the two fixed points 102, thereby effectively locking the contraction of each spiral coil 110 and improving the support stability of the absorbable vascular stent 10.

[0039] In one embodiment, the number of stops is equal to the number of turns of the spiral coil in one of its double helical groups, each stop is connected at a connection point of each turn of the spiral coil in its double helical group, and each stop is configured to lock at a corresponding connection point in another double helical group as the spiral coil of each double helical group extends.

[0040] Please refer to the following: Figures 1 to 4 In one embodiment, the number of stops 200 is equal to twice the number of turns of the spiral coils 110 in each double spiral group 100. Each stop 200 is connected to a connection point 101 at each half-turn of the spiral coil 110 in one of its double spiral groups 100, and each stop 200 is configured to lock at a corresponding connection point 101 in the other double spiral group 100 when the spiral coil 110 of each double spiral group 100 extends.

[0041] In one embodiment, the number of stops is greater than the number of spiral coils in one of its double helical groups but less than twice the number of spiral coils in one of its double helical groups. Some stops are connected to a connection point of each spiral coil in one of its double helical groups, and each remaining stop is connected to each remaining connection point in the double helical group. Each stop is configured to lock at a corresponding connection point in another double helical group as the spiral coils in each double helical group extend.

[0042] Please refer to the following: Figures 1 to 4 In one embodiment, the stop 200 and the corresponding helical coil 110 of the double helix assembly 100 are integrally formed, which improves the connection stability and compactness of the stop 200 and the helical coil 110, and improves the structural compactness and support stability of the absorbable vascular stent 10.

[0043] In one embodiment, the distance between the two corresponding connection points in the two double helix groups is greater than half the pitch of the helix coil of either double helix group and less than the pitch of the helix coil of either double helix group, further improving the support stability of the absorbable vascular stent.

[0044] Please refer to the following: Figures 1 to 4 In one embodiment, each connection point 101 of a double helix assembly 100 is provided with a through hole 103, and a stop member 200 passes through the corresponding through hole 103 in the corresponding double helix assembly 100. Each through hole 103 has a stop groove 104 on its hole wall. Further, a stop block 210 is protruding on the peripheral wall of the stop member 200. The stop block 210 is configured to lock in the corresponding stop groove 104 in the corresponding double helix assembly 100 when the spiral coil 110 of each double helix assembly 100 extends, thereby better ensuring the locking effect of the stop member 200 at the corresponding connection point.

[0045] Please refer to the following: Figures 1 to 4 In one embodiment, one end of the stop 200 is connected to a connection point 101 in one of its double helix assemblies 100. Further, the stop block 210 has a wedge-shaped surface 201, which faces the other end of the stop 200 and is positioned away from the stop 200, further ensuring smooth adjustment and stopping stability of the absorbable vascular stent 10.

[0046] Please refer to the following: Figures 1 to 4 In one embodiment, the stop block 210 and the stop member 200 are integrally formed, which improves the connection stability and compactness of the stop block 210 and the stop member 200, thereby improving the structural compactness and stop stability of the absorbable vascular stent 10.

[0047] Please refer to the following: Figures 1 to 4 In one embodiment, one end of the stop 200 is connected to the connection point 101 in one of its double helix groups 100, and the end face of the other end of the stop 200 is a spherical surface 202, which reduces damage to the blood vessel wall.

[0048] Please refer to the following: Figures 1 to 4 In one embodiment, the two end faces of each spiral loop 110 of each double helix group 100 are spherical end faces 105, which reduces damage to the blood vessel wall.

[0049] In one embodiment, each helical loop of each double helix assembly includes a polylactic acid-based helical loop body and an alloy coating, the alloy coating covering the surface of the polylactic acid-based helical loop body. Further, the alloy coating is a magnesium alloy coating or a zinc alloy coating.

[0050] In one embodiment, each spiral coil of each double spiral assembly is a polylactic acid-based spiral coil, a magnesium alloy spiral coil, or a zinc alloy spiral coil.

[0051] Compared with the prior art, the present invention has at least the following advantages:

[0052] The absorbable vascular stent 10 of this invention comprises two helical coils 110 in each double helix assembly 100. Each helical coil 110 is configured to be coaxial and mirror-image of the other helical coil 110. Each helical coil 110 of one double helix assembly 100 and each helical coil 110 of the other double helix assembly 100 are arranged along the axial direction of the helical coil 110 of the double helix assembly 100. This ensures that at least four helical coils 110 are not overlapping, but are coaxial and mirror-image in pairs, forming the main support structure of the absorbable vascular stent 10. The helical coils 110 have good flexibility and bending adaptability, improving the fit to the vascular wall. Furthermore, each half-turn of the two helical coils 110 intersects to form a connection point 101, and each helical coil of the two double helix assemblies 100... Each half-turn of the spiral coil 110 intersects to form a fixed point 102. Thus, each half-turn of the spiral coil 110 contains two connection points 101 and two fixed points 102. The expansion and contraction of each spiral coil 110 are directly related to the distance between the two connection points 101 and the distance between the two fixed points 102. The stop member 200 is connected to the connection point 101 in one of the double spiral groups 100. The stop member 200 is configured to lock at the corresponding connection point 101 in the other double spiral group 100 when the spiral coil 110 of each double spiral group 100 extends. This achieves the locking of the distance between the two connection points 101 and the distance between the two fixed points 102, thereby effectively locking the contraction of each spiral coil 110 and improving the support stability of the absorbable vascular stent 10.

[0053] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An absorbable vascular stent, characterized in that, include: At least two double helix sets, each of the double helix sets comprising two helical loops, each of the helical loops being configured to be coaxial and mirror-oriented with the other helical loop, such that each half-turn of the two helical loops intersects to form a connection point; Each of the spiral coils of one of the double helix groups and each of the spiral coils of the other double helix group are arranged along the axial direction of the spiral coils of any double helix group, so that all the connection points in the two double helix groups are set in a one-to-one correspondence and arranged along the axial direction of the spiral coils of any double helix group, and each of the spiral coils of the two double helix groups intersects every half turn to form a fixed point. At least one stop is connected to the connection point in one of the double helix groups, and the stop is configured to lock at the corresponding connection point in another double helix group as the spiral loop of each of the double helix groups extends.

2. The absorbable vascular stent according to claim 1, characterized in that, The number of stops is equal to the number of turns of the spiral coil in one of the double helix groups. Each stop is connected to a connection point of each turn of the spiral coil in one of the double helix groups, and each stop is configured to lock at the corresponding connection point in the other double helix group as the spiral coil in each of the double helix groups extends.

3. The absorbable vascular stent according to claim 1, characterized in that, The number of stops is equal to twice the number of turns of the spiral coil in each of the double helix groups. Each stop is connected at the connection point of each half-turn of the spiral coil in one of the double helix groups, and each stop is configured to lock at the corresponding connection point in the other double helix group as the spiral coil in each of the double helix groups extends.

4. The absorbable vascular stent according to claim 1, characterized in that, The number of stops is greater than the number of spiral coils in one of the double helix groups but less than twice the number of spiral coils in one of the double helix groups. Some of the stops are connected to one of the connection points of each spiral coil in one of the double helix groups, and each remaining stop is connected to each of the remaining connection points in the double helix group. Each stop is configured to lock at the corresponding connection point in the other double helix group when the spiral coil in each double helix group is extended.

5. The absorbable vascular stent according to claim 1, characterized in that, The stop member and the corresponding spiral coil of the double spiral assembly are integrally formed; and / or... The distance between the two corresponding connection points in the two double helix groups is greater than half the pitch of the helical loop of either double helix group.

6. The absorbable vascular stent according to claim 1, characterized in that, Each connection point in the first double helix assembly is provided with a through hole, and the stop member passes through the corresponding through hole in the corresponding double helix assembly. Each through hole has a stop groove on its wall. The stop member has a protruding stop block on its peripheral wall, and the stop block is configured to lock into the corresponding stop groove in the corresponding double helix group when the spiral coil of each double helix group is extended.

7. The absorbable vascular stent according to claim 6, characterized in that, One end of the stop is connected to the connection point in one of the double helix groups; The stop block has a wedge-shaped surface, which is positioned facing the other end of the stop member and away from the stop member.

8. The absorbable vascular stent according to claim 6, characterized in that, The stop block and the stop member are integrally formed.

9. The absorbable vascular stent according to claim 1, characterized in that, One end of the stop is connected to the connection point in one of the double helix groups, and the other end of the stop has a spherical surface; and / or, Each helical loop of each of the aforementioned double helical groups has spherical end faces at both ends.

10. The absorbable vascular stent according to claim 1, characterized in that, Each of the spiral coils in each of the double helix groups includes a polylactic acid-based spiral coil body and an alloy coating, the alloy coating covering the surface of the polylactic acid-based spiral coil body; Wherein, the alloy coating is a magnesium alloy coating or a zinc alloy coating; or, Each of the spiral coils in each of the aforementioned double helix groups is a polylactic acid-based spiral coil, a magnesium alloy spiral coil, or a zinc alloy spiral coil.

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