Processing and characterization of braided NiTi microstents for medical applications

作者：Frotscher M^*; Schreiber F; Neelakantan L; Gries T; Eggeler G

来源：Materialwissenschaft und Werkstofftechnik, 2011, 42(11): 1002-1012.

DOI：10.1002/mawe.201100796

• NiTi shape memory alloys
• pseudoelasticity
• microstents
• braiding
• corrosion resistance
• fatigue resistance

In the present exploratory study we investigate the processing of NiTi microstents, which were produced by braiding. We give a short description of the braiding of microstents using 0.1 mm pseudoelastic NiTi wires. We compare our braided microstents with microstents which were produced, using the traditional tube making and laser cutting technology. We outline why braiding may avoid some of the inherent problems related with the traditional procedure and highlight its cost effectiveness. We report on the thermal, chemical and mechanical properties of braided microstents. Most importantly, we provide information on the elementary damage processes which characterize displacement controlled fatigue loading up to 30 . 10(6) cycles. The results presented in this work provide information on a research field, which links the engineering manufacturing field braiding (as a potential new processing technology for NiTi stents) with state-of-the-art materials science techniques for the characterization of pseudoelastic NiTi shape memory alloys.

• 出版日期2011-11