CN219940911U - Vascular stent - Google Patents

Abstract

The embodiment of the utility model provides a vascular stent. The vascular stent is a stent structure which is formed by integrally braiding braided wires and can radially expand and contract, and comprises a supporting section and a compliant section which are connected end to end, wherein the radial compressive strength of the supporting section is greater than that of the compliant section. The embodiment of the utility model combines the advantages of low cost, excellent flexibility and strong fatigue tolerance of the woven stent, and simultaneously can provide enough radial supporting capability through the supporting section, thereby improving the long-term unobstructed capability of the venous vascular compression part and meeting the requirement of the vascular part with high bending or mobility on the compliance through the compliance section.

Description

Vascular stent

Technical Field

The utility model relates to the technical field of medical equipment, in particular to a vascular stent.

Background

Vein compression often causes stenosis of blood vessel channels due to physiological or pathological factor occupation compression, and the measure of operation treatment is mainly to relieve the stenosis of vein blood vessels, quickly restore blood flow channels and restore normal blood flow state. In the existing vein vascular intervention stent technology, the woven stent is still widely applied due to the characteristics of low cost, excellent flexibility, strong fatigue tolerance and the like. However, the woven stent has the defect of low radial supporting force, and long-term reocclusion of the vein is often caused by the fact that the compression of the vein cannot be resisted. Meanwhile, for different vascular anatomical parts, the requirements on various physical properties of the stent are different, strong radial supporting force is required for the pressed part, and for the anatomical part with high bending or mobility, the stent is required to have excellent compliance, so that the existing braided stent is difficult to meet the clinical use requirements. Although the laser engraving type bracket has stronger radial supporting capability, and meanwhile, the flexibility can be improved through an open loop design, the defects of higher cost, poorer fatigue durability and the like exist.

Disclosure of Invention

The utility model aims to provide a vascular stent, which is expected to have the advantages of low cost, excellent flexibility and strong fatigue tolerance of a braided stent, and can provide enough radial supporting capability, so that the long-term unobstructed capability of a venous vascular compression part is improved, and the requirement of the vascular part with high bending or activity on the compliance can be met.

In order to solve the technical problems, the embodiment of the utility model provides a vascular stent which is a stent structure formed by integrally braiding braided wires and capable of expanding and contracting radially, wherein the vascular stent comprises a supporting section and a compliant section which are connected end to end, and the radial compressive strength of the supporting section is larger than that of the compliant section.

As one embodiment, the vascular stent is formed by spirally and alternately braiding a plurality of braiding wires, and the vascular stent comprises a plurality of braiding intersection points which are arranged at intervals along the circumferential direction and the axial direction;

the braiding wires at least at part of braiding points of the supporting section are fixedly connected to enhance the radial compressive strength of the supporting section, and the braiding wires at the braiding points of the compliant section are movably connected.

As an embodiment, the braiding wires at each braiding point of the supporting section are fixedly connected.

As an embodiment, the braiding wires at braiding intersections of the support sections are welded together.

As one embodiment, the number of braid intersections in the circumferential direction of the support segment and the compliant segment is the same.

As one embodiment, the at least one braiding point at the outer end of the compliant section continues to extend helically and form a V-shaped opening;

optionally, the braiding intersection points of the outer ends of the compliant segments continue to extend spirally to form the V-shaped opening;

optionally, the outer ends of the support sections are all braiding intersections.

As one embodiment, the braiding wires at the braiding intersection point of the V-shaped opening are arranged in parallel and welded; or alternatively

The braiding wires at the braiding intersection points of the V-shaped openings are arranged in a staggered mode and are connected in a welded mode; or alternatively

The braiding wires at the braiding intersection points of the V-shaped openings are arranged in a staggered mode and are movably connected.

As one embodiment, the vascular stent is tapered and the diameter of the support section is greater than the diameter of the compliant section.

As one embodiment, the braided wire comprises at least one development enhancing wire having a development capability.

As one embodiment, the development enhancing wire includes: the developing inner core is arranged in the hollow shape memory wire; or alternatively

The development enhancing wire includes: the outer wall of the shape memory wire body is provided with a developing metal coating; or alternatively

The development enhancing wire includes: the shape memory combined wire and the developing metal combined wire are wound or combined in parallel to form the developing reinforcing wire;

optionally, the development enhancing wires are 2.

As can be seen from the technical scheme, the embodiment of the utility model has at least the following advantages and positive effects:

the vascular stent provided by the embodiment of the utility model is a woven stent and is provided with the supporting sections and the compliant sections which are connected end to end, the radial compressive strength of the supporting sections is larger than that of the compliant sections, the supporting sections are further provided with radial supporting performance for resisting the compression of the vascular compression part for a long time on the basis of having all the advantages of the woven stent, the long-term restenosis is avoided, and meanwhile, the compliant sections can meet the physical performance requirements of the vascular bending or moving part, so that the anatomical form of the physiological blood vessel can be reserved, and the physical performance requirements of different vascular parts on the stent are met.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being understood that the drawings in the following description are only embodiments of the present utility model and that other drawings may be obtained according to the drawings provided without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a vascular stent according to an embodiment of the present utility model;

fig. 2a is a schematic diagram of a woven structure of a support section of a vascular stent according to an embodiment of the present utility model;

FIG. 2b is a schematic diagram of a braided structure of a compliant segment of a stent provided in an embodiment of the present utility model;

fig. 3a is a schematic structural diagram of parallel welding of braided wires at braided intersections at an opening at the outer end of a compliant segment of a vascular stent according to an embodiment of the present utility model;

fig. 3b is a schematic structural diagram of staggered welding of braided wires at braided intersections at an opening at the outer end of a compliant segment of a vascular stent according to an embodiment of the present utility model;

fig. 3c is a schematic structural diagram of movable connection of braiding wires at braiding points at an opening at the outer end of a compliant section of a vascular stent according to an embodiment of the present utility model;

fig. 4a to fig. 4d are schematic structural views of a development enhancing wire of a vascular stent according to an embodiment of the present utility model.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the following detailed description of the embodiments of the present utility model will be given with reference to the accompanying drawings. However, those of ordinary skill in the art will understand that in various embodiments of the present utility model, numerous technical details have been set forth in order to provide a better understanding of the present utility model. However, the claimed utility model may be practiced without these specific details and with various changes and modifications based on the following embodiments.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

It should be noted that, unless explicitly stated otherwise, the terms "connected," "connected," and the like should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements.

Referring to fig. 1, an embodiment of the present utility model provides a vascular stent, which is particularly suitable for venous compression interventional therapy, and can rapidly relieve venous compression and restore a blood flow channel. The vascular stent of the present embodiment is a stent structure which is integrally woven from woven filaments and is capable of radial expansion and contraction. The woven stent has low cost, excellent flexibility and strong fatigue tolerance.

The vascular stent mainly comprises a support section 1 and a compliant section 2 which are connected end to end. The radial compressive strength of the support section 1 is greater than the radial compressive strength of the compliant section 2. When the vascular stent is used, the supporting section 1 of the vascular stent is placed at a vascular compression part, and the compliant section 2 is placed at a bending or moving part of a blood vessel, so that the vascular stent has various advantages of a woven stent, and meanwhile, the radial compressive strength of the supporting section 1 is high, so that the vascular stent can resist vascular compression for a long time and is not easy to collapse and deform, further, the vascular long-term re-occlusion can be avoided, and the compliant section 2 has smaller radial compressive strength, so that the vascular stent can conform to the anatomical form of the blood vessel more, and further, the physiological vascular anatomical form can be reserved.

The vascular stent can be formed by spirally and alternately braiding a plurality of braiding wires. The stent includes a plurality of braided intersections that are circumferentially and axially spaced apart. Wherein the number of braiding intersections in the circumferential direction of the support section 1 and the compliant section 2 may be the same.

The braiding wires at least at part of the braiding points of the support section 1 are fixedly connected to enhance the radial compressive strength of the support section 1. The braiding wires at the braiding crossing points of the compliant section 2 are movably connected.

Illustratively, the braiding wires at the braiding points of the support section 1 may be welded together. Compared with movable connection, the support section 1 is fixedly connected with the braiding intersection point, so that the braiding intersection point is stable in structure and cannot collapse and deform due to radial compression, the support section 1 has strong radial compressive strength, long-term compression of a blood vessel compression part can be borne, and restenosis is not easy to occur. Further, the braiding wires at each braiding intersection point of the supporting section 1 are fixedly connected, so that the supporting section 1 has strong radial compressive strength everywhere, and vascular long-term occlusion is better avoided. It will be appreciated that the support section 1 may also have some braiding points that are movably connected, for example, the axial braiding points may be fixed and the movable connection may be spaced apart, which may also improve the radial compressive strength of the support section.

The braiding wires at the braiding points of the compliance section 2 are movably connected, so that the compliance section 2 has excellent compliance, and when the compliance section 2 of the vascular stent is radially pressed at a bent vascular or vascular activity position, each circumferential braiding point can be expanded or slightly contracted along with the action of the stress, so that the physiological anatomical form of the vascular can be better reserved.

Alternatively, the vascular stent may be tapered and the diameter of the support section 1 is larger than the diameter of the compliant section 2, thereby making the stent as a whole more compliant with the anatomy of the vessel. It will be appreciated that the diameters of the support section 1 and compliant section 2 may also be the same.

Alternatively, the helical extension may continue at least one braiding point at the outer end of the compliant segment 2 and form a V-shaped opening 3. Further, the braiding points at the outer ends of the compliant segments 2 may all continue to extend helically to form V-shaped openings 3. The V-shaped opening 3 can disperse the stress of the vessel wall and avoid the damage of the tip of the vessel stent to the vessel wall. Alternatively, the outer ends of the support segments 1 are all braiding points. It will be appreciated that the outer end of the support section 1 may also form one or more open structures.

Specifically, the vascular stent comprises a plurality of right spiral braided wires and left spiral braided wires, and the right spiral braided wires and the left spiral braided wires are respectively staggered to form a plurality of braiding intersection points which are uniformly arranged along the circumferential direction and the axial direction. In order to facilitate the distinction of the different parts, the right spiral braided wire of the supporting section 1 is denoted by 11, the left spiral braided wire is denoted by 12, the braiding intersection point is denoted by 13, the right spiral braided wire of the compliant section 2 is denoted by 21, the left spiral braided wire is denoted by 22, the braiding intersection point is denoted by 23, the right spiral braided wire of the opening 3 is denoted by 31, the left spiral braided wire is denoted by 32, and the braiding intersection point is denoted by 33.

The left side in fig. 1 is the support section 1 of the stent and the right side is the compliant section 2 of the stent. The support section 1 is formed by extending and interweaving a plurality of right spiral braided wires 11 and a plurality of left spiral braided wires 12 in the right spiral direction and the left spiral direction along the axial direction respectively. The stagger knitting is a manner in which the right spiral knitting yarn 11 is pressed against the left spiral knitting yarn 12, and then the right spiral knitting yarn 11 is pressed under by the next left spiral knitting yarn 12, and vice versa. Referring to fig. 2a, a plurality of right spiral braided wires 11 and a plurality of left spiral braided wires 12 are interlaced to form a plurality of braided intersections 13 arranged at intervals along the circumferential direction and the axial direction, and the plurality of braided intersections 13 of the support section 1 are all immovable fixed intersections, and specifically, the braided wires interlaced at the braided intersections 13 can be welded.

The compliant segment 2 is woven in the same way as the support segment 1. The braided filaments of support segment 1 continue to extend helically to form braided filaments of compliant segment 2. Referring to fig. 2b, a plurality of right spiral braided wires 21 and a plurality of left spiral braided wires 22 of the compliant segment 2 are interlaced to form a plurality of braided intersections 23 that are circumferentially and axially spaced apart. The braiding point 23 of the compliant segment 2 may be any free-moving point of intersection. I.e. the braiding wires at braiding points 23 of the compliant segment do not need to be additionally fixed, but the braiding points 23 can remain active. The number of braiding points 23 of the compliant segment 2 is the same as the number of braiding points 13 of the support segment 1 in the circumferential direction.

The opening 3 at the outer end of the compliant segment 2 includes right and left spiral braid wires 31, 32 that continue in a spiral at braid intersection points 33. Referring to fig. 3a, the braiding wires at the braiding points of the V-shaped opening 3 may be arranged in parallel and welded, i.e. two braiding wires are arranged in parallel and welded to form a fixed braiding point 33, and the braiding point 33 continues to extend spirally out of the right spiral braiding wire 31 and the left spiral braiding wire 32. Referring to fig. 3b, the braiding wires at the braiding crossing points of the V-shaped openings 3 may be staggered and welded. Referring to fig. 3c, the braiding wires at the braiding intersection point of the V-shaped opening may be staggered and movably connected. It will be appreciated that this embodiment does not unduly limit the arrangement and manner of attachment of the filaments at the opening.

It should be noted that the braided filaments may employ shape memory filaments including, but not limited to, nitinol filaments.

It should be noted that the braided wire of the vascular stent at least comprises a developing reinforcing wire with developing capability. Illustratively, the development enhancing filaments may be 2, right and left spiral braided filaments with development capability, respectively.

Referring to fig. 1 and 4a, the development enhancing wire 14 may comprise: a hollow shape memory wire 141 and a developing core 142, the developing core 142 being provided in the hollow shape memory wire 141.

As an alternative, referring to fig. 4b, the development enhancing wire 14 may comprise: the shape memory wire 141, the outer wall of the shape memory wire 141 is provided with a developing metal coating 142.

As yet another alternative, referring to fig. 4c, the development enhancing wire 14 may comprise a shape memory composite wire 141 and a development metal composite wire 142, and the shape memory composite wire 141 and the development metal composite wire 142 are wound and combined to form the development enhancing wire 14.

As yet another alternative, referring to fig. 4d, the developing enhancement wire 14 may include a shape memory composite wire 141 and a developing metal composite wire 142, where the shape memory composite wire 141 and the developing metal composite wire 142 are combined in parallel to form the developing enhancement wire 14.

Developing metallic materials include, but are not limited to, tantalum, platinum iridium alloys, gold, and the like.

The vascular stent provided by the embodiment of the utility model has the advantages that the support section has radial support performance of resisting the compression of the vascular compression part for a long time on the basis of having all the advantages of the woven stent, long-term restenosis is avoided, and meanwhile, the compliant section can meet the physical performance requirements of the vascular bending or moving part, so that the anatomical form of the blood vessel which is more in line with physiology can be reserved, and the physical performance requirements of different vascular parts on the stent are met.

It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples of carrying out the utility model and that various changes in form and details may be made therein without departing from the spirit and scope of the utility model.

Claims (10)

1. The vascular stent is a stent structure which is formed by integrally braiding braided wires and can radially expand and contract, and is characterized by comprising a supporting section and a compliant section which are connected end to end, wherein the radial compressive strength of the supporting section is greater than that of the compliant section.

2. The stent of claim 1, wherein the stent is formed by helically interlacing a plurality of braided wires, the stent comprising a plurality of braided intersections circumferentially and axially spaced apart;

the braiding wires at least at part of braiding points of the supporting section are fixedly connected to enhance the radial compressive strength of the supporting section, and the braiding wires at the braiding points of the compliant section are movably connected.

3. The vascular stent of claim 2, wherein the braided filaments at each braided intersection of the support segments are fixedly connected.

4. A vascular stent as in claim 3, wherein the braided filaments at the braided intersections of the support segments are welded together.

5. The vascular stent of claim 2, wherein the number of braided intersections in the circumferential direction of the support segment and the compliant segment is the same.

6. The stent of claim 2, wherein the compliant segment continues to extend helically at least one braid intersection of the outer end and forms a V-shaped opening;

optionally, the braiding intersection points of the outer ends of the compliant segments continue to extend spirally to form the V-shaped opening;

optionally, the outer ends of the support sections are all braiding intersections.

7. The vascular stent of claim 6, wherein the braided filaments at the braided intersections of the V-shaped openings are arranged in parallel and welded together; or alternatively

The braiding wires at the braiding intersection points of the V-shaped openings are arranged in a staggered mode and are connected in a welded mode; or alternatively

The braiding wires at the braiding intersection points of the V-shaped openings are arranged in a staggered mode and are movably connected.

8. The vascular stent of claim 1, wherein the vascular stent is tapered and the diameter of the support section is greater than the diameter of the compliant section.

9. The vascular stent of any one of claims 1 to 8, wherein the braided filaments include at least one visualization enhancing filament having visualization capabilities.

10. The vascular stent of claim 9, wherein the visualization reinforcement wire comprises: the developing inner core is arranged in the hollow shape memory wire; or alternatively

The development enhancing wire includes: the outer wall of the shape memory wire body is provided with a developing metal coating; or alternatively

The development enhancing wire includes: the shape memory combined wire and the developing metal combined wire are wound or combined in parallel to form the developing reinforcing wire;

optionally, the development enhancing wires are 2.