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
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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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