Nishimura I, Yuhta T, Ikubo K, Shimooka T, Murabayashi S, Mitamura Y
Division of Biomedical Engineering, University of Hokkaido, Sapporo, Japan.
ASAIO J. 1993 Jul-Sep;39(3):M762-6.
To overcome the wear problems associated with artificial joint materials, new surface structures with regular patterning were designed and fabricated. The lubrication properties were studied to evaluate the wear of the frictional surfaces. The surface structure was a pattern of "dents" with a diameter of 0.2-1.0 mm and a pitch of 0.6-2.0 mm. The pattern was fabricated on the stainless steel (SUS) surface by a photochemical etching technique with 3 microns depth, and on an ultrahigh molecular weight polyethylene (UHMWPE) surface by mechanical processes. The time dependent changes of frictional force between SUS and UHMWPE were measured, and the surface morphologic changes were observed. The patterned surface showed lower frictional force than the smooth non-patterned surface, and less wear occurred on the patterned sample than on the sample without a pattern. There were optimum sizes for the diameter and the pitch of the pattern. These results demonstrated that lubrication properties could be improved by patterning of the frictional surfaces. The surface patterning was effective in preventing wear of the frictional surface, and the life of an artificial joint could be extended by such patterning.
为克服与人工关节材料相关的磨损问题，设计并制造了具有规则图案的新型表面结构。研究了润滑性能以评估摩擦表面的磨损情况。表面结构是直径为0.2 - 1.0毫米、间距为0.6 - 2.0毫米的“凹痕”图案。该图案通过深度为3微米的光化学蚀刻技术在不锈钢（SUS）表面制造，通过机械加工在超高分子量聚乙烯（UHMWPE）表面制造。测量了SUS和UHMWPE之间摩擦力随时间的变化，并观察了表面形态变化。有图案的表面比光滑无图案的表面显示出更低的摩擦力，并且有图案的样品比无图案的样品磨损更少。图案的直径和间距存在最佳尺寸。这些结果表明，通过对摩擦表面进行图案化可以改善润滑性能。表面图案化在防止摩擦表面磨损方面是有效的，并且通过这种图案化可以延长人工关节的使用寿命。
