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

研制了一种具有细胞毒性的钴铬合金人工股骨头。因此，需要一种高生物相容性的氧化铝陶瓷来取代钴铬。然而，氧化铝陶瓷股骨头并不是常见的头部材料，因为氧化铝陶瓷是低冲击材料。杯子是由超高相对分子质量聚乙烯(UHMWPE)制成的人造软骨。上一次，有报道称发泡UHMWPE具有冲击缓冲能力。该报告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。本研究对超高相对分子质量聚乙烯衬垫的磨损控制、冲击吸收和损伤预防机理进行了研究，该衬垫被认为是植入物系统中人工关节置换的原因。考虑了衬里制造的最佳工艺方法的构建。此外，摩擦测试结果表明，通过DLC膜和杂化纳米金刚石(HND)膜可以很好地控制衬板的磨损粉。此外，经过300,000次厚度为500 nm的摩擦试验，也清楚地表明其具有足够的耐久性。另一方面，研制了UH.M.W.P.E.发泡衬里，并对该材料的抗冲击性能进行了测试。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1 mm的皮肤层。另一方面，实际上还没有进行适合每个患者的大小和形式的衬垫的制造。然而，基于图片信息执行的受影响零件形状数据和CAD数据的创建完成。

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.