为了改善主动脉支架的物理性能和生物相容性, 对支架制备过程中的NiTi合金丝材热处理和电化学抛光过程进行研究. 结果表明, 热处理不仅可以有助于支架段的定型, 而且可以提高丝材机械性能. 热处理温度480℃×7min＋510℃×7min时最为理想, 可以获得较好的物理性能. 电化学抛光可以改善丝材表面质量, 显著提高丝材的疲劳寿命, 并减少附壁血栓形成和内皮增生.
In order to improve the physical properties and biocompatibility of the aortic stent-graft, the effects of heat treatment and electrochemical polishing on nickel-titanium (NiTi) alloy wire during the stent-graft preparation were studied. It is found that heat treatment could help shaping the stent-graft and enhance the mechanical properties of the NiTi wire. The ideal heat-treatment process is heating at 480℃ and 510℃ for 7 min, respectively. By electrochemical polishing, the surface quality and fatigue life of the wire is highly improved. Meanwhile, electrochemical polishing results in reduction of the possibility of the mural thrombus formation and endothelial hyperplasy.
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| [2] | |
| [3] | |
| [4] | Hutschala D, Fleck T, Czerny M, et al. Endoluminal stent-graft placement in patients with acute aortic dissection type B. European Journal of Cardio-Thoracic Surgery, 2002, 21(6): 964-969.[2] Tilo K-lbel, Nuno Dias, Timothy Resch, et al. In situ bending of thoracic stent grafts: clinical application of a novel technique to improve conformance to the aortic arch. J. Vasc. Surg., 2009, 49(6): 1613-1616.[3] Gaudencio Espinosa, Edson Marchiori, Luis Felipe Silva, et al. Initial results of endovascular repair of abdominal aortic aneurysms with a self-expanding stent-graft. Journal of Vascular and Interventional Radiology. 2002, 13(11): 1115-1123.[4] Shabalovskaya Svetlana, Ryh-nen Jorma, Yahia L&rsquo |
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