Influence of nitinol wire surface treatment on oxide thickness and composition and its subsequent effect on corrosion resistance and nickel ion release
Influence of nitinol wire surface treatment on oxide thickness and composition and its subsequent effect on corrosion resistance and nickel ion release
复制标题
DOI：
10.1002/jbm.a.30720
复制
发表时间：
2006-10-01
影响因子：
4.9
通讯作者：
Plumley, D.
中科院分区：
文献类型：
--
作者：
Clarke, B.;Carroll, W.;Plumley, D.
医疗植入物和设备现在每天都成功地用于外科手术。镍和钛的合金，特别是镍钛诺，由于其形状记忆和超弹性特性，在医疗器械工业中受到特别关注。由于镍的已知毒理学效应，镍钛诺在体内的腐蚀行为也至关重要。NiTi合金在生理环境中的稳定性主要取决于表面上主要存在的TiO2氧化物层的性质。在本研究中，使用不同的拉伸工艺和一系列表面制备程序制备了一系列镍钛合金丝。从所获得的结果清楚地看出，具有非常厚的氧化物的线材样品在氧化物层中也含有高的镍含量。在长期和短期实验中，具有较厚氧化物的未处理样品显示出最低的点蚀电位值和更大的镍释放。人们还发现，长期浸泡测试后，击穿电位增加的样品，表现出较低的值最初。从这些结果可以看出，表面处理对于镍钛合金的最佳生物相容性是必不可少的。(c)2006 Wiley Periodicals，Inc.
Medical implants and devices are now used successfully in surgical procedures on a daily basis. Alloys of nickel and titanium, and in particular Nitinol are of special interest in the medical device industry, because of their shape memory and superelastic properties. The corrosion behavior of nitinol in the body is also of critical importance because of the known toxicological effects of nickel. The stability, of a NiTi alloy in the physiological environment is dependant primarily on the properties of the mostly TiO2 oxide layer that is present on the surface. For the present study, a range of nitinol wires have been prepared using different drawing processes and a range of surface preparation procedures. It is clear from the results obtained that the wire samples with very thick oxides also contain a high nickel content in the oxide layer. The untreated samples with the thicker oxides show the lowest pitting potential values and greater nickel release in both long and short-term experiments. It was also found that after long-term immersion tests breakdown potentials increased for samples that exhibited lower values initially. From these results it would appear that surface treatment is essential for the optimum bioperformance of nitinol. (c) 2006 Wiley Periodicals, Inc.