Degradable Mg-Zn-Zr alloy endovascular stent and comprehensive processing technique thereof
A comprehensive treatment and treatment technology, which is applied in metal material coating technology, stents, medical science, etc., can solve the problem of reducing the degradation rate and achieve a good degradation rate effect
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Embodiment 1
[0021] Embodiment 1: Taking the φ60mmMg-3wt%Zn-0.8wt%Zr of self-smelting as raw material through
[0022] (1) Homogenization treatment process: temperature 400°C, time 24h;
[0023] (2) Hot extrusion process: the extrusion ratio is 60;
[0024] (3) Processing vascular stents;
[0025] (4) Aging treatment process: 170 ℃, time is 20h;
[0026] (5) Surface treatment process: the concentration of hydrofluoric acid is 10%, the treatment temperature is 20° C., and the treatment time is 24 hours.
[0027] The vascular stent processed by the above process has excellent apparent quality, no cracks on the stent wall, the thickness of the hydrofluoric acid treatment layer is about 0.3-0.5 μm, and it is well combined with the matrix, and the surface layer does not fall off or crack after the balloon is propped up.
Embodiment 2
[0028] Embodiment 2: Take the φ60mmMg-3wt%Zn-0.8wt%Zr of voluntary smelting as raw material through
[0029] (1) Homogenization treatment process: temperature 400°C, time 24h;
[0030] (2) Hot extrusion process: the extrusion ratio is 60;
[0031] (3) Processing vascular stents;
[0032] (4) Aging treatment process: 170 ℃, time is 20h;
[0033] (5) Surface treatment process: the concentration of hydrofluoric acid is 25%, the treatment temperature is 20° C., and the treatment time is 24 hours.
[0034] The vascular stent processed by the above process has excellent apparent quality, no cracks on the stent wall, the thickness of the hydrofluoric acid treatment layer is about 0.5-0.7 μm, and it is well combined with the matrix, and the surface layer does not fall off or crack after the balloon is propped up.
Embodiment 3
[0035] Embodiment 3: take the φ60mmMg-3wt%Zn-0.8wt%Zr of self-smelting as raw material through
[0036] (1) Homogenization treatment process: temperature 400°C, time 24h;
[0037] (2) Hot extrusion process: the extrusion ratio is 60;
[0038] (3) Processing vascular stents;
[0039] (4) Aging treatment process: 170 ℃, time is 20h;
[0040] (5) Surface treatment process: the concentration of hydrofluoric acid is 40%, the treatment temperature is 20°C, and the treatment time is 24h.
[0041] The vascular stent processed by the above process has excellent apparent quality, no cracks on the stent wall, the thickness of the hydrofluoric acid treatment layer is about 0.8-1 μm, and it is well combined with the matrix, and the surface layer does not fall off or crack after the balloon is propped up.
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