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Stability Performance Analysis of Various Packaging Materials and Coating Strategies for Chronic Neural Implants under Accelerated Reactive Aging Tests

机译:加速下慢性神经植入物的各种包装材料和涂层策略的稳定性性能分析反应性老化试验

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摘要

Reliable packaging for implantable neural prosthetic devices in body fluids is a long-standing challenge for devices’ chronic applications. This work studied the stability of Parylene C (PA), SiO2, and Si3N4 packages and coating strategies on tungsten wires using accelerated, reactive aging tests in three solutions: pH 7.4 phosphate-buffered saline (PBS), PBS + 30 mM H2O2, and PBS + 150 mM H2O2. Different combinations of coating thicknesses and deposition methods were studied at various testing temperatures. Analysis of the preliminary data shows that the pinholes/defects, cracks, and interface delamination are the main attributes of metal erosion and degradation in reactive aging solutions. Failure at the interface of package and metal is the dominating factor in the wire samples with open tips.
机译:用于植入的神经假肢装置的可靠包装在体液中是一种用于设备的慢性应用的长期挑战。这项工作研究了三种溶液中钨丝对钨丝的稳定性,三种溶液:pH 7.4磷酸盐缓冲盐水(PBS),PBS + 30mM H 2 O 2,和PBS + 150 mm H2O2。在各种测试温度下研究了不同的涂层厚度和沉积方法的组合。初步数据的分析表明,针孔/缺陷,裂缝和界面分层是金属腐蚀和反应性老化溶液中降解的主要属性。封装和金属界面的故障是带有开放尖端的电线样品中的主导因素。

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