A study on manufacture of the liner for artificial joints as human-friendly

人工股骨头由具有细胞毒性的钴铬合金（Co-Cr）制成。需要用高生物相容性的氧化铝陶瓷代替钴铬。然而，氧化铝陶瓷股骨头并不是常见的股骨头材料，因为氧化铝陶瓷是一种低冲击材料。杯子是由超高分子量聚乙烯（UHMWPE）制成的人造软骨。在上次的报道中，发泡超高分子量聚乙烯具有冲击缓冲能力。该报告还显示了使用高生物相容性氧化铝陶瓷制成的人工股骨头的可能性。本研究针对植物系统中股骨人工关节置换的原因——超高分子量聚乙烯（UHMWPE）衬垫的磨损控制、冲击吸收和损伤预防机理进行了研究。考虑了衬垫制造的最优工艺方法的构建。此外，通过对衬垫进行摩擦测试，可以清楚地看出，通过给予DLC膜和混合纳米金刚石（HND）膜来控制衬垫的磨损粉末。此外，在500nm的厚度上，经过30万次的摩擦实验，也清楚地表明获得了足够的耐久性。另一方面，制备了uh.m.w.p.e.发泡衬垫，并对该材料的冲击吸收性能进行了测试。最大冲力与塑性变形量成反比关系，表明衬垫的最佳发泡率为80%。在此条件下可获得约1mm的皮肤层。另一方面，制造适合每个病人的大小和形式的衬垫实际上还没有进行。完成了基于图片信息的影响零件形状数据和CAD数据的创建。

An artificial femoral head was made of a cobalt-chromium alloy (Co-Cr) that has cytotoxicity. And there are need that replace Co-Cr by a high-biocompatible alumina ceramics. However, an alumina ceramics femoral head is not common head material because the alumina ceramics is low-impact material. A cup was an artificial cartilage that made of ultrahigh-molecule weight polyethylene (UHMWPE). In last time, it was reported that a foamed UHMWPE has impact cushion ability. And the report showed the possibility that can use an artificial femoral head made of a high-biocompatible alumina ceramics. This research performs development of the wear control, the impact absorption, and the damage prevention mechanism of the UHMWPE liner regarded as the cause of artificial joint re-substitution in the femur in plant system. Construction of the optimal processing method about liner fabrication was considered. Moreover, as a result of carrying out a friction examination, it showed clearly to control the wear powder of a liner by giving a DLC film and a hybrid nano diamond (HND) film. Furthermore, it also showed clearly to acquire sufficient durability after 300,000 friction experiments in the thickness of 500nm. On the other hand, the U.H.M.W.P.E. foaming liner was manufactured and the impact absorption of this material was examined. The maximum impulse force and the amount of plastic deformation have the relation of an inverse proportion, and it showed clearly for the optimum foaming rate of a liner to be 80%. Furthermore, skin layer about 1mm was obtained on this condition. On the other hand, manufacture of the liner suitable for the size and form of patient each has not been performed in fact. However, the creation of affected part form data and CAD data carried out based on picture information was completed.