【摘要】 临床应用的高氮奥氏体不锈钢具有优良的力学性能、腐蚀性能和生物相容性,特别是其强度达到医用316L不锈钢强度2倍左右,但是临床用植入器件并没有充分利用其高强度的优势而进行结构尺寸的优化设计。本文采用有限元方法模拟研究空心结构高氮无镍不锈钢接骨板内孔的数量及孔径变化对弯曲抗力和应力分布的影响规律,结果表明随着孔数和孔径的增加,接骨板的轻量化率呈线性提高,同时三点弯曲时的弯曲抗力也明显降低,均成线性关系,应力分布随着孔的加入逐渐均匀。对于高强度的高氮无镍不锈钢而言,采用三孔结构及孔径为接骨板厚50%的设计,可以实现约15%的轻量化,而且保持较高的抗弯曲性能。同时根据研究结果,建议临床用316L不锈钢接骨板和钛合金接骨板可以采用双孔结构,孔径控制在接骨板厚度的50%以内,能够实现10%左右的轻量化,同时弯曲抗力不明显下降。更多还原

【Abstract】 High nitrogen nickel free stainless steel(HNNFSS) has begun to be used in clinic, which possesses excellent mechanical properties, corrosion resistance and biocompatibility. Especially its strength is two times more than that of the conventional 316 L stainless steel, but this advantage is not fully used in optimization of the structure of the implant devices. In this paper, the effects of the changes of hollow structure, including distribution, size, quantity of hole in HNNFSS bone plate on the biomechanical behavior of bone plates was studied by means of finite element analysis, the result showed that the lightweight ratio increased gradually with the size of hole diameter and the number of hole, and the resistance to bending was decreased. However, the stress distribution of bone plate tends to uniformity during three point bending test. The lightweight ratio of high strength HNNFSS bone plate closed to 15% when used three holes structure with 50% plate thickness as hole diameter. Based on our result, the clinic 316 L plate and titanium plate can get about 10% lightweight and keep good bending properties when use the double hole structure with less 50% plate thickness as hole diameter.更多还原