Zheng Qingli, Dong Pengfei, Li Zhiqiang, Han Xinwei, Zhou Changchun, An Meiwen, Gu Linxia
Institute of Biomedical Engineering, College of Biomedical Engineering, Taiyuan University of Technology, Taiyuan 030024, China.
Department of Mechanical & Materials Engineering, University of Nebraska, Lincoln, NE 68588, United States of America.
Nanotechnol Rev. 2019 Jan;8(1):168-174. doi: 10.1515/ntrev-2019-0016. Epub 2019 Nov 6.
The novel braided composite stent (BCS), woven with both nitinol wires and polyethylene terephthalate (PET) strips, were characterized and compared with the braided nitinol stent in the same weaving pattern. Finite element models simulating the stent compression and bending were developed to quantify its radial strength and longitudinal flexibility. The interaction between the nitinol wires and the PET strips were also delineated. Results showed that the PET strips enforced more constrains on the BCS and thus enhance its radial strength especially at a larger compression load. The longitudinal flexibility of the BCS was less sensitive to the presence of the PET strips. This work suggested that the novel design of the BCS could acquire the advantage of a covered stent without compromising its mechanical performance. The fundamental understanding of the braided composite stent will facilitate a better device design.
新型编织复合支架（BCS）由镍钛诺丝和聚对苯二甲酸乙二酯（PET）条编织而成，对其进行了表征，并与相同编织模式的编织镍钛诺支架进行了比较。开发了模拟支架压缩和弯曲的有限元模型，以量化其径向强度和纵向柔韧性。还描述了镍钛诺丝与PET条之间的相互作用。结果表明，PET条对BCS施加了更多约束，从而提高了其径向强度，尤其是在较大压缩载荷下。BCS的纵向柔韧性对PET条的存在不太敏感。这项工作表明，BCS的新颖设计可以在不损害其机械性能的情况下获得覆膜支架的优势。对编织复合支架的基本理解将有助于更好地设计器械。
