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Development of a Shape-Memory Tube to Prevent Vascular Stenosis

机译:防止血管狭窄的形状记忆管的开发

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摘要

Inserting a graft into vessels with different diameters frequently causes severe damage to the host vessels. Poor flow patency is an unresolved issue in grafts, particularly those with diameters less than 6 mm, because of vessel occlusion caused by disturbed blood flow following fast clotting. Herein, successful patency in the deployment of an approximate to 2 mm diameter graft into a porcine vessel is reported. A new library of property-tunable shape-memory polymers that prevent vessel damage by expanding the graft diameter circumferentially upon implantation is presented. The polymers undergo seven consecutive cycles of strain energy-preserved shape programming. Moreover, the new graft tube, which features a diffuser shape, minimizes disturbed flow formation and prevents thrombosis because its surface is coated with nitric-oxide-releasing peptides. Improved patency in a porcine vessel for 18 d is demonstrated while occlusive vascular remodeling occurs. These insights will help advance vascular graft design.
机译:将移植物插入不同直径的血管中经常会严重破坏宿主血管。在移植物中,尤其在直径小于6 mm的移植物中,通畅性差是一个无法解决的问题,因为快速凝固后血液流动受阻会导致血管闭塞。在本文中,报道了将约2mm直径的移植物部署到猪血管中的成功通畅。提出了一个新的属性可调形状记忆聚合物库,该库通过在植入时沿周向扩大移植物直径来防止血管损伤。聚合物经历了七个连续的应变能保持形状编程循环。此外,新的移植管具有扩散器的形状,可最大程度减少扰动的流动形成并防止血栓形成,因为其表面覆盖有释放一氧化氮的肽。在发生闭塞性血管重塑的同时,证明了在猪血管中通畅18 d的改善。这些见解将有助于推进血管移植设计。

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