X-ray visibility and metallurgical features of NiTi shape memory alloy with erbium
X-ray visibility and metallurgical features of NiTi shape memory alloy with erbium
复制标题
铒镍钛形状记忆合金的X射线能见度及金相特征
DOI：
10.1016/j.matlet.2014.09.071
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发表时间：
2014
影响因子：
3
通讯作者：
A. Tuissi
中科院分区：
文献类型：
--
作者：
S. Tofail;J. Butler;A. Gandhi;J. M. Carlson;S. Lavelle;Shane Carr;P. Tiernan;G. Warren;K. Kennedy;C. Biffi;P. Bassani;A. Tuissi
在微创手术中，手术装置的高x射线可见性对于在目标解剖部位精确放置这些装置同时将患者的x射线暴露降至最低至关重要。用于微创手术的镍钛和普通金属生物材料（如不锈钢和钴铬合金）由于其弱x射线吸收能力（不透光性）而固有地不太可见。致密和高原子序数的元素，如铂（Pt）被添加到镍钛和不锈钢中，以提高放射性不透明度。与使用较重原子的传统理解相反，可以通过添加稀土（RE）镧系元素如铒（Er）来增强射线不透明度。将NiTi-RE的形状记忆效应（SME）和超弹性（SE）保持到功能水平是一个重要的挑战。本文以NiTi-Er为例，表明该合金可以通过火花等离子烧结（SPS）制备，然后通过传统的冷热加工加工成适合生物医学和非生物医学应用的多种形式。这些装置的高可见度将使这些装置的放置和操作变得容易，减少患者在部署期间的创伤，并将显着减少患者一生中接受的辐射剂量。
A high X-ray visibility of surgical devices is critical during minimally invasive surgery for exact placement of these devices within the targeted anatomical site while keeping the X-ray exposure of the patient to a minimum. NiTi and common metallic biomaterials (e.g. stainless steel and Co-Cr alloys) used in minimally invasive surgery are inherently less visible due to their weak X-ray absorption ability (radiopacity). Dense and high atomic number elements such as platinum (Pt) have been added to NiTi and stainless steel to enhance radiopacity. Contrary to the conventional understanding of using heavier atoms, radiopacity enhancement can be achieved by adding rare earth (RE) lanthanide elements such as erbium (Er). The retention of the shape memory effect (SME) and superelasticity (SE) in NiTi-RE to a functional level is an important challenge. Here we take NiTi-Er as a case study and show that this alloy can be conveniently prepared by spark plasma sintering (SPS) and subsequently processed by conventional hot and cold working to a number of forms suitable for both biomedical and nonbiomedical applications. Higher visibility of these devices will provide ease of placement and manipulation of these devices, reduce patients’ trauma during deployment and will significantly reduce radiation dose received by a patient in his lifetime.