Self-expandable stent and preparation method and application thereof

A self-expanding, waveform technology, applied in stents, blood vessels, devices of human tubular structures, etc., can solve the problem that the stent cannot meet the requirements of the special lumen of the iliac vein, and achieve good adaptability to the shape of blood vessels, good compliance performance, enhanced The effect of crush resistance

Active Publication Date: 2019-04-23
SHENZHEN KYD BIOMEDICAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] 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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  • Self-expandable stent and preparation method and application thereof
  • Self-expandable stent and preparation method and application thereof
  • Self-expandable stent and preparation method and application thereof

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0065] This embodiment provides a self-expanding stent, which has two different types of spiral segments arranged in the axial direction of a hollow tube, wherein the first spiral segment includes a single spiral, and the second spiral segment includes two Double helix formed by parallel helix. See Figure 1-Figure 3 , 100 and 300 respectively show a first helical section including a single helix and a second helical section including two parallel double helixes.

[0066] In addition, the single helix and the double helix extend in the same direction and circumferentially around the central axis of the tube, and the adjacent ends of the single helix and the double helix merge into the double helix in the transition zone between the two. It is a single helix, and the other ends of the single helix and the double helix are respectively closed along the circumference of the tube in the other transition zone to form a closed loop with no free end.

[0067] Specifically, the transition...

Embodiment 2

[0076] Based on Embodiment 1, a further improvement of this embodiment is that when the stent is in an unbound, stable, free expansion state, the lift angle of the single helix is ​​not greater than the lift angle of the double helix. The lift angle refers to the inclination angle of the tangent at a point on the spiral line to the radial section of the stent. See figure 1 , The complementary angle of the double helix of the second helical section 300 is α, that is, the helix angle of the double helix is ​​α, and the complementary angle of the single helix of the first helical section 100 is β, that is The helix angle of a single helix is ​​β, and α≤β.

Embodiment 1 or Embodiment 2

[0078] Based on Embodiment 1 or Embodiment 2, a further improvement of this embodiment is that adjacent turns of a single helix are connected by the first connecting member to the peaks and troughs with the closest distance, and any helix in the double helix is ​​connected to it. The two wave crests or two wave troughs with the closest distance are connected by the second connecting member between adjacent spiral wires. 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 spiral sections are further enhanced.

[0079] See Figure 1-4 , The first connecting part forms an angle with the axial direction of the stent, and the second connecting part is substantially parallel to the axial direction of the stent.

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Abstract

The invention relates to the technical field of medical instruments for interventional operations and particularly discloses a self-expandable stent suitable for supporting of a narrow lumen and a preparation method and application thereof. The self-expandable stent adopts the supporting structure that a single-spiral segment and a double-spiral segment are simultaneously designed on a single stent, and connecting members having different structures are circumferentially designed in the single-spiral segment and the double-spiral segment, so that the stent has different flexibility and crushing resistance in the two segments. The technical problem can be solved that the performance of a stent in the prior art cannot fully satisfy iliac vein implantation, and the stent has higher safety andis especially suitable for the treatment of iliac vein stenosis.

Description

Technical field [0001] The invention relates to the technical field of medical devices for interventional procedures, in particular to a self-expanding stent suitable for supporting a narrow lumen and a preparation method and application thereof. Background technique [0002] The stent is used to be placed in the diseased segment of the lumen to support the lumen of the stenosis occluded segment and keep the lumen unobstructed. Typically, vascular stents are used to place vascular lesions in order to support the stenosis and occlusion of the blood vessels, reduce the elastic retraction and reshaping of the blood vessels, and maintain smooth blood flow in the lumen. Due to the differences in the physiological structure of blood vessels in different parts of the human body, special stents suitable for different vascular lesions have been developed, and stents with different indications cannot be used instead. At present, there are more research and application of vascular support ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61F2/915A61F2/06A61F2/88
CPCA61F2/06A61F2/88A61F2/915A61F2002/821A61F2002/91516A61F2002/91525A61F2002/91541A61F2002/91575A61F2002/91583
Inventor 汪泽辉陈奕龙
Owner SHENZHEN KYD BIOMEDICAL TECH CO LTD
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