聚合物基关节软骨的改性及摩擦学研究

Modification and Tribological Study on Implant Polymers of Hip Prosthesis

聚合物人工关节软骨材料在使用过程中产生的磨屑,是导致骨质溶解和关节松动的主要原因。分析了常用软骨材料超高分子量聚乙烯(UHMWPE)和聚醚醚酮(PEEK)的磨损机理,对陶瓷颗粒填充、纤维增强以及离子注入和γ射线照射改性人工关节UHMWPE和PEEK的研究进行了介绍,讨论了不同改性方法对聚合物软骨材料磨损性能的影响,并对聚合物关节软骨材料的发展方向进行了有益探讨。研究表明,纯聚合物软骨材料在磨损过程中产生大量的疲劳裂纹,甚至剥落,表现为疲劳磨损、磨粒磨损等;陶瓷颗粒和纤维的填充改料的弹性模量,硬度和润湿性,改善了材料的空间结构,摩擦学性能得到改善,表现为轻微的疲劳磨损;离子性,提高了软骨材注入和γ射线照射改性人工关节软骨材料,通过打断分子链,自由基重新结合形成交联结构,改善了材料的机械性能和摩擦学性能。

The polymer artificial articular cartilage material produces wear debris in the use process,and the release of particulate wear debris may induce biological responses that cause osteolysis and implant loosening.The wear mechanism of commonly used articular cartilage material such as UHMWPE and PEEK are analyzed.The study on ceramic particles filler,fiber enhancement as well as ion implantation and gamma irradiation modify UHMWPE and PEEK are reviewed,the effect on wear performance of the different modified method to the polymer cartilage material are discussed,and the development and study of polymer joint are discussed.The research indicated that,the pure polymer cartilage material produces the massive fatigues cracking in the wear process,even flakes,displays for the fatigues wear,abrasive wear and so on;the ceramic particle and the fiber modification,enhanced the cartilage material elasticity module,hardness and the wettability,improved the material spatial structure,the tribological performance was improved,displayed for the slight fatigue wear;Ion implantation and gamma irradiation modification artificial articular cartilage material,through breaks the molecular chain,the free radical reunifies cross linked structure,improved the material mechanical and tribological properties.