Hoh Daniel J, Hoh Brian L, Amar Arun P, Wang Michael Y
Department of Neurological Surgery, Keck School of Medicine, University of Southern California, Los Angeles, California, USA.
Neurosurgery. 2009 May;64(5 Suppl 2):199-214; discussion 214-5. doi: 10.1227/01.NEU.0000330392.09889.99.
SHAPE MEMORY ALLOYS possess distinct dynamic properties with particular applications in neurosurgery. Because of their unique physical characteristics, these materials are finding increasing application where resiliency, conformation, and actuation are needed. Nitinol, the most frequently manufactured shape memory alloy, responds to thermal and mechanical stimuli with remarkable mechanical properties such as shape memory effect, super-elasticity, and high damping capacity. Nitinol has found particular use in the biomedical community because of its excellent fatigue resistance and biocompatibility, with special interest in neurosurgical applications. The properties of nitinol and its diffusionless phase transformations contribute to these unique mechanical capabilities. The features of nitinol, particularly its shape memory effect, super-elasticity, damping capacity, as well as its biocompatibility and biomechanics are discussed herein. Current and future applications of nitinol and other shape memory alloys in endovascular, spinal, and minimally invasive neurosurgery are introduced. An understanding of the metallurgic properties of nitinol provides a foundation for further exploration of its use in neurosurgical implant design.
形状记忆合金具有独特的动态特性，在神经外科手术中有特殊应用。由于其独特的物理特性，这些材料在需要弹性、构象和驱动的地方得到了越来越广泛的应用。镍钛诺是最常制造的形状记忆合金，它对热和机械刺激的响应具有显著的机械性能，如形状记忆效应、超弹性和高阻尼能力。由于其出色的抗疲劳性和生物相容性，镍钛诺在生物医学领域有特殊用途，尤其在神经外科应用中备受关注。镍钛诺的性能及其无扩散相变促成了这些独特的机械能力。本文讨论了镍钛诺的特性，特别是其形状记忆效应、超弹性、阻尼能力以及生物相容性和生物力学。介绍了镍钛诺和其他形状记忆合金在血管内、脊柱和微创神经外科手术中的当前和未来应用。了解镍钛诺的冶金特性为进一步探索其在神经外科植入物设计中的应用奠定了基础。
