PDF(Pubmed)
Abstract：
Platinum and platinum-based alloys are used as the electrode material in cochlear implants because of the biocompatibility and the favorable electrochemical properties. Still, these implants can fail over time. The present study was conducted to shed light on the effects of microstructure on the electrochemical degradation of platinum. After three days of stimulation with a square wave signal, corrosive attack appeared on the platinum surface. The influence of mechanical deformation, in particular rolling, on the corrosion resistance of platinum was also prominent. The cyclic voltammetry showed a clear dependence on the electrolyte used, which was interpreted as an influence of the buffer in the artificial perilymph used. In addition, the polarization curves showed a shift with grain size that was not expected. This could be attributed to the defects present on the surface. These findings are crucial for the manufacture of cochlear implants to ensure their long-term functionality.
摘要：
由于具有良好的生物相容性和电化学性能，铂和铂基合金被用作耳蜗植入物的电极材料。尽管如此，随着时间的推移，这些植入物可能会失败。本研究旨在阐明微观结构对铂电化学降解的影响。用方波信号刺激三天后，腐蚀攻击出现在铂表面。机械变形的影响，特别是滚动，对铂的耐腐蚀性也很突出。循环伏安法显示出对所用电解质的明显依赖性，这被解释为缓冲液对所用人工外淋巴液的影响。此外,极化曲线显示出预期不到的晶粒尺寸偏移。这可归因于表面上存在的缺陷。这些发现对于制造耳蜗植入物以确保其长期功能至关重要。
