CN216294346U

CN216294346U - Vertebral artery stent system

Info

Publication number: CN216294346U
Application number: CN202123332328.8U
Authority: CN
Inventors: 信朝华; 邓双; 李振宇
Original assignee: Butler Biotechnology Suzhou Co ltd
Current assignee: Butler Biotechnology Suzhou Co ltd
Priority date: 2021-12-28
Filing date: 2021-12-28
Publication date: 2022-04-15
Anticipated expiration: 2031-12-28

Abstract

The application discloses vertebral artery stent system, this system include support and sacculus, the support is formed through laser cutting by tubular product, and the support is sacculus expanding structure during the compression state of support, the support is pressed and is held the surface of sacculus during the expansion state of support, the support follows the expansion of sacculus and expansion the near-end of sacculus is provided with convex circular conical surface, the biggest external diameter of circular conical surface is greater than the external diameter of the straight section of sacculus, the support is accomplished the expansion back, the near-end of support is the shape of horn mouth, the shape of horn mouth with the shape phase-match of the circular conical surface of sacculus. The utility model provides a horn mouth of support near-end is effectual has solved the laminating problem of the subclavian artery inner wall that support and vertebral artery starting position link to each other, can reduce the restenosis rate effectively.

Description

Vertebral artery stent system

Technical Field

The utility model belongs to the field of medical instruments, and particularly relates to a vertebral artery stent system.

Background

The stroke caused by the stenosis at the starting part of the vertebral artery is more and more serious, and the medical treatment can only reduce the thrombosis and can not eliminate the focus of the vascular stenosis. The surgical operation has low success rate and high risk for treating cerebral apoplexy, and is rarely adopted. Although the vascular balloon angioplasty can obviously reduce the degree of stenosis in a blood vessel cavity in a short time, the restenosis rate after the operation is higher due to the high elastic retraction of the vertebral artery blood vessel. In view of the different drawbacks of other treatment options, the endovascular stenting procedure for vertebral artery stenosis has begun to be widely studied and used.

The domestic vertebral artery stent is designed in a straight cylinder shape along with a coronary stent or a carotid stent, and does not conform to the anatomical structure of the initial part of the vertebral artery, so that the defect exists in the treatment. For example, a straight tubular stent has poor adherence to the vertebral artery starting site, so that plaque detachment at the vertebral artery starting site cannot be avoided, and in addition, the port of the stent causes continuous stimulation to the vascular wall, causing intimal hyperplasia, and easily causing in-stent restenosis.

Disclosure of Invention

The utility model aims at providing a vertebral artery support system of comparatively ideal to solve the adherence problem of the artery under the clavicle that support and vertebral artery initial site and be connected with vertebral artery initial site, and then effectively reduce vertebral artery initial site restenosis rate.

The technical scheme adopted by the application for solving the technical problems is as follows:

the utility model provides a vertebral artery stent system, includes support and sacculus, the support is formed through laser cutting by tubular product, the support is sacculus expanding structure during the compression state of support, the support is pressed and is held the surface of sacculus during the expansion state of support, the support is along with the expansion of sacculus and expansion the near-end of sacculus is provided with convex circular conical surface, the biggest external diameter of circular conical surface is greater than the external diameter of the straight section of sacculus, after the expansion is accomplished to the support, the near-end of support is the horn mouth shape, the horn mouth shape with the shape phase-match of the circular conical surface of sacculus.

The application can also solve the problems in the prior art through the following technical scheme:

in one embodiment, the conical surface is angled between 0 and 90 degrees from the axis of the straight section of the balloon.

In one embodiment, a raised structure is provided at the distal end of the balloon.

In a preferred embodiment, the projection structure is cylindrical or drum-shaped.

In a preferred embodiment, the distal end of the stent has a protrusion that matches the shape of the protruding structure after the stent is expanded.

In a preferred embodiment, the stent is a closed-loop stent, the closed-loop stent is composed of a plurality of rhombic grids, the grids at the proximal end part form a bell mouth shape after being expanded, the grids at the distal end part form the bulges after being expanded, and round corners are arranged at two ends of the stent.

In a preferred embodiment, the support is an open-loop support, the main structure of the open-loop support is composed of wave-shaped rods and axial connecting rods, the wave crests and the wave troughs of two adjacent wave-shaped rods are connected through the axial connecting rods, each axial connecting rod is composed of a straight section and an n-shaped section, the straight sections are connected with the wave troughs, the n-shaped sections are connected with the wave crests, the near end of the support is composed of a plurality of spindle-shaped rods and near end connecting rods, the near end connecting rods are in an omega-shaped structure, the two adjacent spindle-shaped rods are connected through two near end connecting rods in mirror symmetry, the rod width of the near end connecting rods is larger than that of the spindle-shaped rods, the far end of the support is composed of a plurality of wave-shaped rods and far end connecting rods, and the far end connecting rods are straight rods.

In one embodiment, the material of the stent includes a metal material and a polymer material.

In a preferred embodiment, the metallic material comprises cobalt chromium alloys L605 and 316 stainless steel.

In a preferred embodiment, the polymer material is a degradable polymer material such as polylactic acid.

In one embodiment, the stent is coated on its outer surface with a drug coating to combat vascular stenosis.

Compare with prior art, the advantage of this application lies in: the bell mouth arranged at the end part of the bracket is in arc smooth transition, and the metal connecting rod of the bell mouth is designed to be more attached to the inner wall of the blood vessel, so that the blood vessel is protected, and the bracket can be effectively prevented from being embedded into the inner wall of the blood vessel to cause damage to the blood vessel; the distal end of the support is provided with the bulge, so that the support can be effectively prevented from displacing, and the restenosis rate is reduced.

Drawings

FIG. 1 is a schematic view of the general construction of a vertebral artery stent system of the present invention;

FIG. 2 is a schematic view of the expanded state of the stent and balloon;

FIG. 3 is a schematic view showing an expanded state of the balloon according to the first embodiment;

fig. 4a and 4b are schematic views of the distal end structure of the balloon;

FIG. 5 is a schematic view of one embodiment of a stent in a flat expanded configuration;

FIGS. 6a and 6b are schematic views of the distal end of the stent;

fig. 7 is a schematic plan view of the closed-loop stent of the second embodiment.

Detailed Description

The vertebral artery stent system provided by the utility model is further described in detail with reference to the attached drawings and embodiments. The advantages and technical solutions of the present application are clearer, and it should be noted that all the drawings of the present application adopt a very simplified manner, and are only used for the purpose of conveniently and clearly explaining the embodiments of the present application.

Example one

As shown in fig. 1 and 2, the vertebral artery stent system according to the present invention includes a stent 1 and a balloon 2, wherein the stent 1 is formed by cutting a tube with laser, the stent 1 is of a balloon-expandable structure, the stent 1 is pressed and held on the outer surface of the balloon 2 in a compressed state of the stent 1, the stent 1 expands with the expansion of the balloon 2 in an expanded state of the stent 1, as shown in fig. 3, a convex conical surface 21 is provided at the proximal end of the balloon 2, the maximum outer diameter of the conical surface 21 is larger than the outer diameter of a straight section 22 of the balloon 2, the proximal end of the stent 1 is in the shape of a bell-mouth 11 after the stent 1 is expanded, and the shape of the bell-mouth 11 is matched with the shape of the conical surface 21 of the balloon. The bell mouth 11 has a smooth structure, is more easily attached to the inner wall of the blood vessel, and reduces the damage to the inner wall of the blood vessel.

In one embodiment, the conical surface 21 is angled from 0 to 90 degrees from the axis of the straight section 22 of the balloon 2. In a preferred embodiment, the conical surface 21 is a cambered surface.

As shown in fig. 4a, a convex structure 23 is arranged at the distal end of the balloon, and the convex structure 23 is cylindrical; as shown in fig. 4b, the protruding structure 23 is drum-shaped.

As shown in fig. 5, the stent 1 is a closed-loop stent, the closed-loop stent is composed of a plurality of rhombic grids, the grids at the proximal end part form a bell mouth 11 after expansion, the grids at the distal end part form a bulge 12 after expansion, and rounded corners 114 are arranged at both ends of the stent 1, and the rounded corners 114 can reduce the injury of the stent to blood vessels.

As shown in fig. 6a and 6b, the shape of the bulge 12 at the distal end of the expanded stent 1 is matched with the shape of the bulge structure 23 arranged at the distal end of the balloon, as shown in fig. 6a, the bulge 12 is cylindrical, and as shown in fig. 6b, the bulge is drum-shaped. The bulge 12 of the stent 1 can increase the bonding force between the stent surface and the vessel wall, provide more ideal radial supporting force, effectively inhibit stent displacement and reduce the restenosis rate of the vertebral artery initial part.

In one embodiment, the material of the stent includes a metal material and a polymer material, the metal material includes cobalt-chromium alloy L605 and 316 stainless steel, and the polymer material is a degradable polymer material such as polylactic acid. In a preferred embodiment, the outer surface of the stent is coated with an anti-vascular stenosis drug coating.

Example two

In contrast to the first embodiment, as shown in fig. 7, in one embodiment, the stent 1 is an open-loop stent, the main structure 13 of the open-loop stent is composed of wave-shaped rods and axial connecting rods 131, the wave crests and wave troughs of two adjacent wave-shaped rods are connected by the axial connecting rods 131, the axial connecting rods are composed of straight sections and "n" -shaped sections, the straight sections are connected with the wave troughs, and the "n" -shaped sections are connected with the wave crests. The bell mouth 11 at the near end of the bracket 1 is composed of a plurality of spindle-shaped rods 111 and a near end connecting rod 112; the near-end connecting rods 112 are in an omega-shaped structure, and two adjacent fusiform rods 111 are connected through two near-end connecting rods 112 which are mirror-symmetrical; the rod width of the proximal connecting rod 112 is larger than that of the spindle-shaped rod 111, so that the contact area with the blood vessel is correspondingly increased, the connecting rod 112 is not easy to be embedded into the inner wall of the blood vessel, and the injury of the stent to the initial part of the vertebral artery is reduced. In the present embodiment, the distal structure of the stent 1 forming the protrusions 12 is composed of a plurality of wave-shaped rods 121 and distal connecting rods 122, and the distal connecting rods 122 are straight rods.

Finally, it should be understood that the above-mentioned embodiments are merely preferred embodiments of the present invention, and not intended to limit the present invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a vertebral artery stent system, includes support and sacculus, the support is formed through laser cutting by tubular product, the support is sacculus expanding structure during the compression state of support, the support is pressed and is held the surface of sacculus during the expansion state of support, the support is along with the expansion of sacculus expands, its characterized in that the near-end of sacculus is provided with convex circular conical surface, the biggest external diameter of circular conical surface is greater than the external diameter of the straight section of sacculus, after the expansion is accomplished to the support, the near-end of support is the horn mouth shape, the horn mouth shape with the shape phase-match of the circular conical surface of sacculus.

2. The vertebral artery stent system of claim 1, wherein the conical surface is angled between 0 and 90 degrees from the axis of the straight section of the balloon.

3. The vertebral artery stent system of claim 1, wherein a raised structure is provided at a distal end of the balloon.

4. The vertebral artery stent system of claim 3, wherein the raised structure is cylindrical or drum-shaped.

5. The vertebral arterial stent system of claim 3, wherein the distal end of the stent has a protrusion that matches the shape of the raised structure after expansion of the stent.

6. The vertebral artery stent system of claim 5, wherein the stent is a closed-loop stent comprised of a plurality of diamond-shaped cells, the cells at the proximal portion having a flared shape after expansion, the cells at the distal portion having the protrusions after expansion, and rounded corners at both ends of the stent.

7. The vertebral artery stent system of claim 5, wherein the stent is an open-loop stent, the main structure of the open-loop stent is composed of wave-shaped rods and axial connecting rods, the wave crests and the wave troughs of two adjacent wave-shaped rods are connected through the axial connecting rods, the axial connecting rods are composed of straight sections and n-shaped sections, the straight sections are connected with the wave troughs, the n-shaped sections are connected with the wave crests, the proximal end of the stent is composed of a plurality of spindle-shaped rods and proximal connecting rods, the proximal connecting rods are in an omega-shaped structure, two adjacent spindle-shaped rods are connected through two proximal connecting rods in mirror symmetry, the rod width of the proximal connecting rods is larger than that of the spindle-shaped rods, the distal end of the stent is composed of a plurality of wave-shaped rods and distal connecting rods, and the distal connecting rods are straight rods.

8. The vertebral artery stent system of claim 1, wherein the outer surface of the stent is coated with an anti-vascular stenosis drug coating.