CN210205002U

CN210205002U - Blood vessel support

Info

Publication number: CN210205002U
Application number: CN201920669099.2U
Authority: CN
Inventors: Liwen Wang; 王丽文; Dingguo Huang; 黄定国; Qing Zhu; 朱清; Linlin Zhang; 张琳琳; Zhaoduo Zhang; 张兆夺
Original assignee: Shanghai Minimally Invasive Heart Vein Medical Technology Co Ltd
Current assignee: Shanghai Lanmai Medical Technology Co ltd; Shanghai Minimally Invasive Heart Pulse Medical Technology Group Co ltd
Priority date: 2019-05-10
Filing date: 2019-05-10
Publication date: 2020-03-31
Anticipated expiration: 2029-05-10

Abstract

The utility model discloses a vascular stent, including the support main part, the support main part is the net tubular structure of weaving by the wire, wherein, the support main part includes first support section and the second support section of connecting in the axial, the mesh density of first support section with the mesh density of second support section is different. The utility model provides a blood vessel support has naked section can improve treatment to the narrow of tired inferior vena cava and iliofemoral femoral vein, has dense net structure that mesh density is great to oppression position can improve support intensity and anti extrusion performance, has sparse net structure that mesh density is less to crooked position can increase compliance performance and adherence performance; the blood vessel anatomical form has a variable diameter structure, can conform to the blood vessel form, and is suitable for various blood vessel diameters.

Description

Blood vessel support

Technical Field

The utility model relates to a blood vessel intervenes medical field, especially relates to a vascular support.

Background

Venous diseases are the more common diseases in vascular surgical diseases at present, in particular to iliac vein compression syndrome, which is the syndrome that iliac arteries are compressed to cause intracavity adhesion, stenosis or occlusion, so that various clinical symptoms occur. The incidence rate of iliac vein compression syndrome is 20-40%.

Interventional therapy has been regarded as the conventional art formula of treatment vein pressurized in recent years, and the support that is used for the treatment vein stenosis in the market at present has cutting support and a weaving support, and cutting support can support the stenosis block section blood vessel, reduces the blood vessel elasticity and contracts, keeps the lumen blood flow unobstructed, but also has some weak points, such as compliance is not enough, problem such as easy fracture. The braided stent is a net structure formed by braiding and winding one or more wires, and the braided stent receives more and more attention due to the advantages of good flexibility, strong supporting force, good adherence and the like.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a blood vessel support is provided, strong support intensity and excellent compliance have simultaneously.

The utility model discloses a solve above-mentioned technical problem and the technical scheme who adopts provides a vascular support, including the support main part, the support main part is the net tubular structure of weaving by the wire, wherein, the support main part includes first support section and the second support section of connecting in the axial, the mesh density of first support section with the mesh density of second support section is different.

Further, the stent main body is of a reducing structure in the axial direction, and the proximal end diameter D1 of the stent main body is larger than the distal end diameter D2 thereof.

Further, the proximal diameter D1 of the stent main body is 8-22mm, and the distal diameter D2 of the stent main body is 6-20 mm.

Furthermore, the meshes of the stent main body are rhombic meshes, the side length A of each rhombic mesh is 1-5mm, and the included angle β of each rhombic mesh is 90-160 degrees.

Further, the shorter diagonal length of the two diagonals of the diamond-shaped mesh in the first stent section is 1-4mm, and the shorter diagonal length of the two diagonals of the diamond-shaped mesh in the second stent section is 2-6 mm.

Further, the blood vessel support also comprises a first naked section, the first naked section comprises at least one first bulge formed by weaving metal wires in the circumferential direction, the far end of the first naked section is connected with the near end of the first support section, and the far end of the first support section is connected with the near end of the second support section.

Further, the proximal end of the first stent section comprises at least one third protrusion formed by weaving metal wires in the circumferential direction, and the vertex of the first protrusion of the first bare section is on the same axis with the vertex of the third protrusion of the proximal end of the first stent section.

Further, the vertex of the first bulge at the proximal end of the first bare segment and the vertex of the third bulge at the proximal end of the first stent segment are distributed at equal intervals along the circumference of the blood vessel stent.

Further, the length L3 of the first bare section in the axial direction is 1-10 mm.

Further, the number of the first protrusions of the first bare segment is 1-10.

Further, the blood vessel stent also comprises a second naked segment, the second naked segment comprises at least one second bulge formed by weaving metal wires in the circumferential direction, and the proximal end of the second naked segment is connected with the distal end of the second stent segment.

Further, the first bare segment partially overlaps the first stent segment in an axial direction, and the first bare segment partially extends beyond the first stent segment in the axial direction.

Further, the extending direction of the first naked segment and the axial direction of the blood vessel bracket form an included angle of 0-60 degrees.

Further, the mesh density of the first bare segment and the mesh density of the second stent segment are both less than the mesh density of the first stent segment.

The utility model discloses contrast prior art has following beneficial effect: the utility model provides a vascular support, vascular support main part is including first support section and the second support section that has different mesh densities, support main part mesh density changes, be favorable to using different positions vein lesion area, for example to the iliac vein, the right iliac vein is oppressed by the right iliac artery, this position is being located the originated section of right iliac vein, need high anti extrusion performance, so the supporting structure at here can be the establishment structure of high density mesh, and the later stage needs strong support intensity and anti extrusion performance area according to anatomical structure can be high density mesh establishment, mesh density degree can be different according to different demands. The region with high bending performance can adopt a braided structure with low mesh density, and the larger mesh can increase the bending performance and the flexibility of the region and better fit the shape of the blood vessel; and the stent main body is arranged into a reducing structure so as to better conform to the shape of the blood vessel. Especially, the proximal end of the stent main body is provided with the first naked section, so that the whole stent can stretch out of the iliac vein and stretch into the inferior vena cava without affecting the blood flow of the contralateral vein, and the integrity of the stent after being placed into the vein can be ensured. And the second naked segment arranged at the far end can cross other vein branches to avoid influencing the blood flow of other branches. The venous blood vessel stent provided by the utility model can be used for treating various venous diseases. The treatment effect can be improved by aiming at the affected inferior vena cava and iliofemoral stenosis, the support strength and the anti-extrusion performance can be improved by aiming at the compressed part with a dense mesh structure, and the compliance performance and the adherence performance can be improved by aiming at the bent part with a large mesh sparse mesh structure; aiming at the anatomical morphology of blood vessels, the variable diameter structure can conform to the morphology of the blood vessels and is suitable for various diameters of the blood vessels.

Drawings

Fig. 1 is a schematic structural view of a vascular stent in an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a grid cell in an embodiment of the present invention;

FIG. 3 is a schematic view of a vein being compressed according to an embodiment of the present invention;

FIG. 4 is a schematic view of the blood vessel stent used after being implanted into a human body according to the embodiment of the present invention;

fig. 5(a) -5 (d) are schematic partial distribution diagrams of the first bare section in the embodiment of the present invention.

In the figure:

1 blood vessel support 2 vein 3 artery

10 stent body 11 first stent section 12 second stent section

13 first bare section 131 first bump 14 grid cell

Detailed Description

The invention is further described with reference to the following figures and examples.

To more clearly describe the structural features of the present invention, the terms "proximal" and "distal" are used as terms of orientation, wherein "proximal" means at the end near the heart; "distal" means away from the heart. The term "or" is generally employed in its sense including "and/or" unless the content clearly dictates otherwise.

Referring to fig. 1 and 2, the blood vessel stent 1 provided in this embodiment includes a stent main body 10, the stent main body 10 is woven by metal wires into a mesh tubular structure, and has a plurality of mesh cells 14, the stent main body 10 includes a first stent section 11 and a second stent section 12 connected in an axial direction, a proximal end region of the stent main body 10 is woven by metal wires into the first stent section 11, a mesh aperture of the first stent section 11 is smaller, and a mesh density is larger; the distal end area of the stent body 10 is woven from wire into a second stent section 12, the mesh aperture of the second stent section 12 being larger and the mesh density being smaller. The pressed part of the vein needs strong supporting strength, so that meshes of the stent main body 10 can become dense, and the supporting strength and the local anti-extrusion performance are increased; the non-pressed part and the joint crossing part need good flexibility, so that meshes of the stent at the position can be enlarged, and the flexibility and the adherence are improved. Specifically, in fig. 1, L2 is the first stent section 11, the area has small meshes, the distance H1 between two opposite vertices in the axial direction of the area lattice unit is preferably 1 to 4mm, L4 is the second stent section 12, the area has large meshes, and the distance H2 between two opposite vertices in the axial direction of the area lattice unit is preferably 2 to 6 mm.

The stent main body 10 can be in a diameter-variable or constant-diameter structure in the axial direction, wherein the diameter-variable stent is more suitable for vein anatomical structures, is more suitable for vein characteristics, has greater advantages on long-section lesions, and can better conform to the shape of a blood vessel. The isodiametric stent can be suitable for a small number of lesion areas, the lesion areas are short, the diameter change is not large, and the isodiametric stent can be suitable. In one embodiment, the stent body 10 is a variable diameter stent in the axial direction, the proximal diameter D1 of the stent body 10 is preferably 8-22mm, and the distal diameter D2 of the stent body 10 is preferably 6-20 mm. In order to better conform to the shape of the blood vessel, the difference between the proximal diameter D1 and the distal diameter D2, i.e., the diameter variation size, may be 2mm or 4 mm.

The metal wire of the braided blood vessel stent 1 can be memory alloy, stainless steel, titanium alloy, nickel alloy, cobalt-chromium alloy and biodegradable material; preferably, the stent body 10 is woven from NiTi (nickel titanium) wires with a diameter of 0.1-0.5mm, and the entire stent 1 may be woven from one or more metal wires. One metal wire is woven with few connection points; and the multiple metal wires are woven to have good wall-adhering performance and high processing efficiency.

Referring to fig. 2, preferably, the grid cells 14 woven by the metal wires are diamond-shaped mesh holes, the side length of each diamond-shaped mesh hole is a, the included angle of each diamond is β, the two parameters and the number of the metal wires used by the stent body 10 influence each other, the shorter the side length a is, the larger the angle β is, the stronger the support strength/anti-extrusion capability of the manufactured stent is, and the bending performance is good, the longer the side length a is, the smaller the angle β is, the weaker the support strength/anti-extrusion capability of the stent is, and the poor the bending performance is.

Referring to fig. 3 and 4, if the disease of the inferior vena cava is affected, the blood vessel stent 1 is extended into the inferior vena cava 2, if the disease of the inferior vena cava is affected, the distal stage has an influence on the blood flow of the lateral vena cava, and if the disease of the inferior vena cava is affected too much, the distal stage also has an influence on the blood flow of the lateral vena cava, and if the disease of the inferior vena cava is affected too much, the distal stage has an occlusion of the lateral vena cava, preferably, the proximal end of the stent body 10 is provided with a first bare section 13, the first bare section 13 circumferentially includes at least one first protrusion 131 formed by braiding a metal wire, the distal end of the first bare section 13 is connected with the proximal end of the first stent section 11, the distal end of the first stent section 11 is connected with the proximal end of the second stent section 12, in one embodiment, the first bare section 13 is partially overlapped with the first stent section 11 in the axial direction, and the first bare section 13 extends beyond the first stent section 11 in the axial direction, the distal end of the stent body 10 is provided with a second bare section (not shown in the axial direction, the first bare section 13), the second bare section 13 is connected with the proximal end of the second stent body, and the proximal end of the second stent body, the proximal end of the stent body, the second bare section, the stent body, the proximal end of the stent, the stent body, the bare section 13, the bare section includes at least one of the bare section, the:

the proximal end of the first support section comprises at least one third bulge formed by weaving metal wires in the circumferential direction, the vertex of the first bulge at the proximal end of the first naked section 13 and the vertex of the third bulge at the proximal end of the first support section 11 can be on the same axis, the structural applicability is strong, the vertex of the third bulge at the proximal end of the first support section 11 can also be between the vertices of the first bulges at the proximal ends of two adjacent first naked sections 13, and the structure has good adherence; preferably, the apices of the first bulges at the proximal end of the first bare segment 13 and the apices of the third bulges at the proximal end of the first stent segment 11 are equally distributed along the circumferential direction of the blood vessel stent 1, and because the vein anatomical structure is an ellipse, the first bare segment 13 can also be designed into a height-variable structure, a height-variable structure or a spiral structure, etc. to adapt to different vein shapes. Several structures shown in fig. 5(a) to 5(d) can extend into the inferior vena cava, wherein the first bare sections 13 in fig. 5(a) are spaced structures, specifically, the vertex of the proximal end of the first stent section 11 is located between the vertices of the proximal ends of two adjacent first bare sections 13, and the heights of the first protrusions 131 in the axial direction are the same, so that the vascular stent 1 can extend into the inferior vena cava to ensure the vascular morphology thereof and the adherence performance of the vascular stent 1 to the iliac veins; in fig. 5(b) and (c), the vertex of the first protrusion at the proximal end of the first bare segment 13 and the vertex of the third protrusion at the proximal end of the first stent segment 11 are located on the same axis, and the heights of the vertexes of the first protrusions 131 in the axial direction are the same, so that the vascular stent 1 has good adherence performance, strong support strength and anti-extrusion performance. In fig. 5(d), the first bare section 13 is a height-variable structure, specifically, the height of the vertex of the first protrusion 131 in the axial direction gradually increases, after the blood vessel stent 1 of the structure is implanted into the inferior vena cava, the short first protrusion 131 can be located at the bifurcation of the inferior vena cava, and the long first protrusion 131 is located at the straight section of the inferior vena cava, which is beneficial to the patency of the blood flow of the contralateral vein. The first bare section 13 can be woven in different configurations as desired. In addition to the proximal first bare segment 13, a second bare segment may be added to the distal end to avoid affecting other branch blood flows. The second bare section has a similar structure, number and shape as the first bare section 13, and different structures are woven according to requirements.

The utility model provides a vascular support 1's mesh density changes, be favorable to being used for different positions vein pathological change region, for example to the iliac vein, the right iliac vein is oppressed by right iliac support main part, this position is just being located the originated section of right iliac vein, need high anti extrusion performance, so the supporting structure here can be the establishment structure of high density mesh, and the later stage needs strong support strength and anti extrusion performance region can be high density establishment according to anatomical structure, according to different clinical demands, the degree of change of mesh density can be different. The region with high bending performance can adopt a braided structure with low mesh density, the bending performance and the compliance performance of the mesh can be improved by enlarging the mesh, and the mesh can better conform to the shape of the blood vessel. Particularly, the first naked section 13 is arranged at the near end of the stent main body 10, so that the whole stent can extend out of the iliac vein and extend into the inferior vena cava without affecting blood flow of the contralateral vein, and the integrity of the stent after being placed into the vein can be ensured. And the second naked segment arranged at the far end can cross other vein branches to avoid influencing the blood flow of other branches. The venous blood vessel stent provided by the utility model can be used for treating various venous diseases. The treatment effect can be improved by aiming at the bare sections of the affected inferior vena cava and iliofemoral stenosis, the supporting strength and the anti-extrusion performance can be improved by aiming at the compression part with the first bracket section 11, and the compliance performance and the adherence performance can be improved by aiming at the bending part with the second bracket section 12 with large mesh; aiming at the anatomical morphology of blood vessels, the variable diameter structure can conform to the morphology of the blood vessels and is suitable for various diameters of the blood vessels.

Although the present invention has been described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. The utility model provides a blood vessel support, includes the support main part, the support main part is the net tubular structure of being woven by the wire, its characterized in that, the support main part includes first support section and the second support section of connecting in the axial, the mesh density of first support section with the mesh density of second support section is different.

2. The stent of claim 1, wherein the stent body is of a variable diameter structure in the axial direction, and the proximal diameter D1 of the stent body is larger than the distal diameter D2 thereof.

3. The vascular stent of claim 2, wherein the stent body has a proximal diameter D1 of 8-22mm and a distal diameter D2 of 6-20 mm.

4. The stent as claimed in claim 1, wherein the meshes of the stent body are diamond-shaped meshes, the side length A of the diamond-shaped meshes is 1-5mm, and the included angle β of the diamond-shaped meshes is 90-160 °.

5. The stent of claim 4, wherein the shorter of the two diagonals of the diamond-shaped mesh openings in the first stent section is 1-4mm in length and the shorter of the two diagonals of the diamond-shaped mesh openings in the second stent section is 2-6mm in length.

6. The vascular stent of claim 1, further comprising a first bare segment comprising at least one first protrusion formed by a metal wire braid in a circumferential direction, a distal end of the first bare segment being connected to a proximal end of the first stent segment, and a distal end of the first stent segment being connected to a proximal end of the second stent segment.

7. The vascular stent of claim 6, wherein the proximal end of the first stent section circumferentially includes at least one third protrusion formed by braiding a wire, the apex of the first protrusion of the first bare section being co-axial with the apex of the third protrusion of the proximal end of the first stent section.

8. The vascular stent of claim 6, wherein apices of the first protrusion proximal to the first bare segment are equally spaced from apices of the third protrusion proximal to the first stent segment along a circumference of the vascular stent.

9. The vascular stent of claim 6, wherein the first bare segment has a length L3 in the axial direction of 1-10 mm.

10. The vascular stent of claim 6, wherein the first protrusions of the first bare segment number from 1 to 10.

11. The vascular stent of claim 6, wherein the first bare segment partially overlaps the first stent segment in an axial direction and the first bare segment partially extends beyond the first stent segment in the axial direction.

12. The stent-graft of claim 6, wherein the extending direction of the first bare segment is at an angle of 0 ° to 60 ° with respect to the axial direction of the stent-graft.

13. The vascular stent of claim 6, wherein the mesh density of the first bare segment and the mesh density of the second stent segment are both less than the mesh density of the first stent segment.

14. The vascular stent of any one of claims 1-13, further comprising a second bare segment comprising at least one second protrusion formed by braiding a metal wire in a circumferential direction, a proximal end of the second bare segment being connected to a distal end of the second stent segment.