Self-expanding stent

一种自扩张、支撑结构的技术，应用在支架等方向，能够解决支架不能满足髂静脉特殊性管腔适用要求等问题，达到好适应血管形态、好贴壁性能、降低发生率的效果

Active Publication Date: 2021-09-21
SHENZHEN KYD BIOMEDICAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] The present invention firstly provides a self-expanding stent, which can solve the technical problem that the prior art stent cannot meet the application requirements of special lumens such as the iliac vein

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] This embodiment provides a self-expanding stent, which has two different types of helical sections that form a hollow tube and are arranged in the axial direction thereof, wherein the first helical section includes a single helix, and the second helical section includes two A double helix made of parallel helices. see Figure 1-Figure 3 , where 100 and 300 respectively show a first helical segment comprising a single helix and a second helical segment comprising two parallel double helixes.

[0067] And, the single helix and the double helix extend circumferentially in the same direction around the central axis of the tubular shape, and the adjacent ends of the single helix and the double helix merge in the transition zone between the two It is a single helix, and the other end of the single helix and the double helix are respectively closed along the circumferential direction of the tubular shape in another transition zone to form a closed loop without free ends.

[...

Embodiment 2

[0077] Based on the embodiment 1, the further improvement of this embodiment is that when the stent is in an unconstrained, stable and freely expanding state, the ascending angle of the single helix is ​​not greater than the ascending angle of the double helix. The lift angle refers to the inclination angle of the tangent line at a point on the helix to the radial section of the stent. see figure 1 , the complementary angle of the lead angle of the double helix of the second helical segment 300 is α, that is, the helix angle of the double helix is ​​α, and the complementary angle of the lead angle of the single helix of the first helical segment 100 is β, that is The helix angle of a single helix is ​​β, α≤β.

Embodiment 1 or Embodiment 2

[0079] Based on Embodiment 1 or Embodiment 2, the further improvement of this embodiment is that the adjacent turns of the single helix are connected by the first connecting member to the crests and troughs with the closest distance, any helix in the double helix and its The two crests or two troughs with the closest distance are connected between adjacent helical wires by the second connecting part. The length of the first connecting part is significantly smaller than that of the second connecting part, so that the anti-extrusion performance and compliance performance of the aforementioned two helical sections are further enhanced respectively.

[0080] see Figure 1-4 , the first connecting part forms an included angle with the axial direction of the bracket, and the second connecting part is substantially parallel to the axial direction of the bracket.

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Abstract

The invention relates to the technical field of medical instruments for interventional operations, and particularly discloses a self-expansion stent suitable for supporting a narrow lumen and a preparation method and application thereof. According to the self-expanding stent, a single-spiral-section supporting structure and a double-spiral-section supporting structure are designed on a single stent at the same time, and connecting parts with different structures are designed on the single-spiral section and the double-spiral section along the circumferential direction, so that the stent has different flexibility and extrusion resistance on the two sections. The technical problem that the performance of the stent in the prior art cannot completely meet the requirement for iliac vein implantation can be solved, safety is higher, and the stent is particularly suitable for treatment of iliac vein stenosis.

Description

[0001] This application is a divisional application with the original application number 2019100963223 and the name "a self-expanding stent and its preparation method and application". The filing date of the original application is January 31, 2019. technical field [0002] The invention relates to the technical field of medical devices for interventional operations, in particular to a self-expanding stent suitable for supporting narrow lumens, a preparation method and application thereof. Background technique [0003] The stent is used to be placed in the diseased segment of the lumen to support the lumen of the stenotic occlusion segment and keep the lumen unobstructed. A typical example is a vascular stent, which is used to place in the vascular diseased segment to support the stenotic occluded segment of the blood vessel, reduce the elastic retraction and reshaping of the blood vessel, and maintain the smooth blood flow in the lumen. Due to the differences in the physiol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61F2/915
CPCA61F2/915A61F2002/821A61F2002/91558
Inventor 汪泽辉陈奕龙
Owner SHENZHEN KYD BIOMEDICAL TECH CO LTD
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