Parylene-Based Flexible Microelectrode Arrays for the Electrical Recording of Muscles and the Effect of Electrode Size
Parylene-Based Flexible Microelectrode Arrays for the Electrical Recording of Muscles and the Effect of Electrode Size
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DOI：
10.3390/app10207364
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发表时间：
2020-10-01
影响因子：
2.7
通讯作者：
Park, Dong-Wook
中科院分区：
文献类型：
--
作者：
Choi, Bong-Jun;Kim, Ju-Hwan;Park, Dong-Wook
小型化柔性微电极阵列非常适合小面积表面肌电图 (sEMG) 检测身体特定区域肌肉产生的电活动。在这里，我们提出了一种灵活的 8 通道微电极阵列，其电极直径为 150-300 μm，用于小面积 sEMG 记录。基于柔性聚对二甲苯 C 基板的微电极阵列记录了弯曲皮肤表面的 sEMG 信号，最大信噪比 (SNR) 为 21.4 dB。从 17671-59325 μ m(2) 的小区域记录的 sEMG 信号显示出信号和噪声之间的明显区别。此外，通过快速傅里叶变换（FFT）转换信号，在频域中分析 sEMG 数据，并验证了所提出的微电极可以在小面积上可靠地记录多通道 sEMG。此外，还进行了最大自主收缩（MVC）实验来确认微电极阵列的记录能力，这与之前的报道一致。最后，我们通过比较两种不同电极尺寸的结果来证明电极尺寸的影响。当电极尺寸增加3.37倍时，幅度的均方根值（V-rms）增加2.64倍，从而使SNR从16.9 dB增加到21.4 dB。这项研究展示了基于聚对二甲苯的柔性微电极阵列的扩展用途。
Miniaturized flexible microelectrode arrays are desirable for small-area surface electromyography (sEMG) to detect the electrical activity generated by muscles in a specific area of the body. Here, we present a flexible 8-channel microelectrode array with electrodes of diameter 150-300 mu m for small-area sEMG recordings. The microelectrode arrays based on a flexible Parylene C substrate recorded the sEMG signals from a curved skin surface with a maximum signal-to-noise ratio (SNR) of 21.4 dB. The sEMG signals recorded from a small area of 17671-59325 mu m(2) showed a clear distinction between the signal and noise. Further, the sEMG data were analyzed in the frequency domain by converting the signals via fast Fourier transform (FFT), and it was verified that the proposed microelectrode could reliably record multichannel sEMGs over a small area. Moreover, a maximum voluntary contraction (MVC) experiment was performed to confirm the recording capability of the microelectrode array, which showed consistency with the previous reports. Finally, we demonstrated the effects of the electrode size by comparing the results for two different electrode sizes. When the electrode size was increased 3.37 times, the root-mean-square value of the amplitude (V-rms) increased 2.64 times, consequently increasing the SNR from 16.9 to 21.4 dB. This study demonstrates the expanded utility of Parylene-based flexible microelectrode arrays.