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Ruthenium oxide based microelectrode arrays for in vitro and in vivo neural recording and stimulation

机译:基于氧化钌的微电极阵列,用于体外和体内神经记录和刺激

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摘要

We have characterized the in vitro and in vivo extracellular neural recording and stimulation properties of ruthenium oxide (RuOx) based microelectrodes. Cytotoxicity and functional neurotoxicity assays were carried out to confirm the in vitro biocompatibility of RuOx. Material extract assays, in accordance to ISO protocol "10993-5: Biological evaluation of medical devices", revealed no significant effect on neuronal cell viability or the functional activity of cortical networks. In vitro microelectrode arrays (MEAs), with indium tin oxide (ITO) sites modified with sputtered iridium oxide (IrOx) and RuOx in a single array, were developed for a direct comparison of electrochemical and recording performance of RuOx to ITO and IrOx deposited microelectrode sites. The impedance of the RuOx-coated electrodes measured by electrochemical impedance spectroscopy was notably lower than that of ITO electrodes, resulting in robust extracellular recordings from cortical networks in vitro. We found comparable signal-to-noise ratios (SNRs) for RuOx and IrOx, both significantly higher than the SNR for ITO. RuOx-based MEAs were also fabricated and implanted in the rat motor cortex to demonstrate manufacturability of the RuOx processing and acute recording capabilities in vivo. We observed single-unit extracellular action potentials with a SNR >22, representing a first step for neurophysiological recordings in vivo with RuOx based microelectrodes.
机译:我们表征了氧化钌(Ruox)微电极的体外和体内细胞外神经记录和刺激性质。进行细胞毒性和功能性神经毒性测定以确认ruox的体外生物相容性。材料提取物测定,根据ISO协议“10993-5:医疗器械的生物评估”,揭示了对神经元细胞活力的显着影响或皮质网络的功能活性。在体外微电极阵列(MEAS),用诸如诸如阵列的溅射氧化铱(IROX)和Ruox改性的氧化铟锡(ITO)位点,用于直接比较Ruox至ITO和IROX沉积的微电极的电化学和记录性能网站。通过电化学阻抗光谱测量的Ruox涂覆电极的阻抗显着低于ITO电极的电极,从而产生了来自体外皮质网络的鲁棒细胞外记录。我们发现Ruox和Irox的相当的信噪比比(SNRS),两者都明显高于ITO的SNR。还在大鼠电机皮层中制造并植入基于Ruox的MES,以证明RUOX加工和体内急性记录能力的可制造性。我们观察到具有SNR> 22的单位细胞外动作电位,代表体内与Ruox基微电极的神经生理记录的第一步。

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