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CN-122005163-A - Balloon expansion type stretching structure partition support special for aortic stenosis

CN122005163ACN 122005163 ACN122005163 ACN 122005163ACN-122005163-A

Abstract

The invention provides a balloon expansion type auxetic structure partition support special for aortic stenosis, which comprises a framework and a covering film, wherein the framework comprises an auxetic supporting area and two compliant areas, the auxetic supporting area is arranged between the two compliant areas, the covering film is respectively covered on the auxetic supporting area and the compliant areas, the auxetic supporting area comprises at least two circles of auxetic units, the at least two circles of auxetic units are axially arranged, the two circles of auxetic units are adjacent to each other, the auxetic units comprise a plurality of polygonal grids which are circumferentially arranged, each polygonal grid is provided with a pair of inner concave corners, and at least part of polygonal grids are internally provided with reinforcing rings which are respectively connected with the pair of inner concave corners through reinforcing wires so as to improve the geometric suitability of the polygonal grids with diseased vessels.

Inventors

  • WANG LIXIN
  • ZHANG YULI
  • HU CHENGKAI
  • Fang Hanji
  • ZHAO YE
  • XIE CHENGZHI
  • FU WEIGUO

Assignees

  • 上海浦东复旦大学张江科技研究院
  • 复旦大学附属中山医院

Dates

Publication Date
20260512
Application Date
20260407

Claims (10)

  1. 1. The balloon-expandable type auxetic structure partition bracket special for aortic stenosis is characterized by comprising a framework (100) and a covering film (200), wherein the framework (100) comprises an auxetic supporting area (110) and two compliant areas (120), the auxetic supporting area (110) is arranged between the two compliant areas (120) at intervals, and the covering film (200) is respectively covered on the auxetic supporting area (110) and the compliant areas (120): The auxetic support region (110) comprises at least two circles of auxetic units (111), at least two circles of auxetic units (111) are arranged along the axial direction, and two adjacent circles of auxetic units (111) are connected, the auxetic units (111) comprise a plurality of polygonal grids (111 a) arranged along the circumferential direction, and the polygonal grids (111 a) are provided with a pair of concave corners (111 a 0); At least part of the polygonal mesh (111 a) is internally provided with reinforcing rings (111 b), and the reinforcing rings (111 b) are respectively connected with a pair of concave corners (111 a 0) through reinforcing wires (111 c).
  2. 2. A balloon expandable auxetic structure partition stent dedicated for aortic stenosis as in claim 1, wherein the polygonal mesh (111 a) comprises: a first circumferential edge (111 a 1); A second circumferential edge (111 a 2); The two axial edges (111 a 3), the two axial edges (111 a 3) are respectively connected between the first circumferential edge (111 a 1) and the second circumferential edge (111 a 2), and the middle parts of the two axial edges (111 a 3) are recessed towards the inside of the polygonal mesh (111 a) so as to form a pair of concave corners (111 a 0); In the same circle of the auxetic unit (111), two adjacent polygonal meshes (111 a) are connected by a first circumferential edge (111 a 1) and a second circumferential edge (111 a 2).
  3. 3. A balloon expandable auxetic structure partition stent dedicated for aortic stenosis as claimed in claim 2, wherein the auxetic units (111) of adjacent two turns are connected by an axial edge (111 a 3) of the polygonal mesh (111 a), and the polygonal mesh (111 a) of adjacent two turns is arranged in a staggered manner in the circumferential direction.
  4. 4. A balloon expandable auxetic structure partition stent dedicated for aortic stenosis as in claim 3, wherein each of said polygonal meshes (111 a) is internally provided with a stiffening ring (111 b).
  5. 5. A balloon expandable auxetic structure partition stent dedicated for aortic stenosis as claimed in claim 3, wherein the reinforcement rings (111 b) are provided inside all polygonal meshes (111 a) of one ring of the auxetic units (111), and the reinforcement rings (111 b) are not provided inside all polygonal meshes (111 a) of the other ring of the auxetic units (111) adjacent thereto.
  6. 6. A balloon expandable auxetic structure partition stent dedicated for aortic stenosis as in claim 1, wherein a plurality of rings of the auxetic units (111) are arranged at intervals in the axial direction, and the polygonal meshes (111 a) of two adjacent rings are arranged in one-to-one correspondence in the circumferential direction and are connected by connecting wires (111 d).
  7. 7. A balloon expandable auxetic structure partition stent dedicated for aortic stenosis as claimed in claim 6, wherein both ends of the connection wire (111 d) are respectively fixed at the concave corners (111 a 0) of the polygonal mesh (111 a) corresponding to the adjacent two turns of auxetic cells (111).
  8. 8. The balloon expandable auxetic structure partition stent for aortic stenosis according to any one of claims 1 to 7, wherein the pair of concave corners (111 a 0) are circumferentially staggered, and the reinforcing wire (111 c) is tangentially connected to the reinforcing ring (111 b).
  9. 9. A balloon expandable auxetic structure partition stent dedicated for aortic stenosis as in claim 2, wherein the compliant zone (120) comprises at least two rings of undulating support rings (121), adjacent rings of undulating support rings (121) being interconnected by peaks and valleys.
  10. 10. The balloon expandable auxetic structure partition stent dedicated for aortic stenosis according to claim 9, wherein a development mark structure (300) is provided at the peak of the waved support ring (121) located at the outermost side; And/or the connection part of the first circumferential edge (111 a 1) and the axial edge (111 a 3) is provided with a developing mark structure (300); And/or the connection part of the reinforcing wire (111 c) and the concave corner (111 a 0) is provided with a developing mark structure (300).

Description

Balloon expansion type stretching structure partition support special for aortic stenosis Technical Field The invention relates to the technical field of covered stents, in particular to a balloon-expandable type partitioned stent special for aortic stenosis. Background Balloon expandable stent implantation has become an important way to treat aortic stenosis as interventional techniques have evolved. The operation flow of the technology is that a balloon delivery system with a compressed stent is delivered to the lesion of aortic stenosis through vascular intervention technology, liquid (such as contrast agent) is injected into the balloon through a balloon catheter, so that the balloon is inflated, radial force is applied to the stent sleeved outside the balloon, the stent is forced to be plastically deformed and expanded until the stent is attached and a stenosed vessel segment is expanded, and finally, the balloon is decompressed and withdrawn, and the expanded stent is permanently implanted to maintain the blood flow unobstructed. However, existing stents (represented by Cheatham-Platinum stents) on which this technique relies have inherent limitations in structural design. Such stents are typically of uniform cross-section, straight cylindrical configuration with a framework of uniform lattice structure formed integrally therewith. This is in fundamental contradiction to the typical hourglass-shaped pathological anatomy of aortic stenosis (i.e., middle stenosis, opposite ends are relatively normal). When the balloon is uniformly inflated, the straight cylindrical stent is forced to perform full-segment synchronous expansion, and differential support and lamination of a narrow segment and a normal segment cannot be realized. This geometrical and mechanical mismatch results in a severely uneven distribution of contact stresses between the stent and the vessel wall, resulting in poor adhesion. Disclosure of Invention The invention aims at overcoming the defects in the prior art, and provides a special balloon dilation type auxetic structure partition bracket for aortic stenosis, which improves the geometric suitability of a lesion vessel. In order to achieve the above object, the present invention provides the following technical solutions: The special balloon expansion type auxetic structure partition support for aortic stenosis comprises a framework and a tectorial membrane, wherein the framework comprises an auxetic supporting area and two compliant areas, the auxetic supporting area is arranged between the two compliant areas, and the tectorial membrane is respectively coated on the auxetic supporting area and the compliant areas: The auxetic support area comprises at least two circles of auxetic units, the at least two circles of auxetic units are arranged along the axial direction, and the adjacent circles of auxetic units are connected, the auxetic units comprise a plurality of polygonal grids arranged along the circumferential direction, and the polygonal grids are provided with a pair of concave corners; At least part of the polygonal mesh is internally provided with a reinforcing ring, and the reinforcing ring is respectively connected with a pair of concave corners through reinforcing wires. As a preferred embodiment, the polygonal mesh includes: A first circumferential edge; A second circumferential edge; The two axial edges are respectively connected between the first circumferential edge and the second circumferential edge, and the middle parts of the two axial edges are recessed towards the inside of the polygonal mesh to form a pair of concave corner parts; in the same circle of the auxetic unit, two adjacent polygonal meshes are connected by a first circumferential edge and a second circumferential edge. As a preferred embodiment, the auxetic cells of two adjacent circles are connected by the axial edges of the polygonal mesh, and the polygonal mesh of two adjacent circles is arranged in a staggered manner in the circumferential direction. As a preferred embodiment, the inside of each of the polygonal meshes is provided with a reinforcing ring. As a preferred embodiment, the reinforcing rings are arranged inside all polygonal grids of one ring of the auxetic unit, and the reinforcing rings are not arranged inside all polygonal grids of the other ring of the auxetic unit adjacent to the one ring. As a preferred embodiment, a plurality of circles of the auxetic units are arranged at intervals along the axial direction, and the polygonal grids of two adjacent circles are arranged in a one-to-one correspondence manner along the circumferential direction and are connected through connecting wires. As a preferred embodiment, two ends of the connecting wire are respectively fixed at the concave corners of the polygonal mesh corresponding to the adjacent two rings of auxetic units. As a preferred embodiment, the pair of concave corners are staggered circumferentially, and the reinforcing wires a