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逐层增强的植入物 - China Medical Device Manufacturer
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Wed, January 17th, 2018

2010年1月CMDM电子快讯 » 技术新知
逐层增强的植入物

By: Maria Fontanazza


普渡大学研究人员Shaoyi Wen(左)和Andrew Hecht正在研究激光沉积工艺中的一项技术。图片由普渡大学/ANDREW HANCOCK提供。
普渡大学(美国伊利诺伊州,West Lafayette)的研究人员预计2010年至2030年人们对于髋关节和膝关节植入物的需求将会翻番。普渡大学的研究小组正致力于研发一种相比现有器械更加经久耐用的植入物,以应对将来植入物需求总量的上升。

普渡大学机械工程系教授Yung Shin表示,植入物的平均寿命约为10年,因此一些患者一生之中需要更换三、四次植入物。

普渡大学研发的技术采用了一种称为激光沉积的先进工艺。这种方法采用激光熔化形成一层由金属粉末和陶瓷混合而成的沉降涂层,然后一层层凝固成型构成部件。由于无需模具,这种方法能够提高成本效益,而且采用此法生产整形植入物的速度比目前的方法快10倍。开发过程中,成像扫描图均发送至实验室。激光利用这些图像制造部件。制造商可利用该技术生产定制和复杂部件。

Shin教授表示,激光沉积可形成一种多孔钛基表面和磷酸钙外表面,与传统植入物相比,能更好的模拟骨骼硬度。这项工艺尤其适合用于钛涂层。

兼任普渡大学激光制造中心主任的Shin教授同时表示:“钛及其它金属与骨骼的硬度或性质并不匹配,因此您需要对其涂敷匹配的涂层。如果你想采用在金属表面进行陶瓷沉积,那么你肯定不希望材料突然变化,因为这会导致热膨胀和化学组分存在差异,从而产生裂缝。”

激光沉积工艺通过逐层对材料进行涂层解决了这个问题。普渡大学的研究小组仍需进行更多研究,方可将其付诸商业应用。他们同时打算对具有自我修复能力的形状记忆材料进行研究。

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