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A Compliant Ionic Adhesive Electrode with Ultralow Bioelectronic Impedance.
Advanced Materials ( IF 27.4 ) Pub Date : 2020-08-07 , DOI: 10.1002/adma.202003723 Liang Pan 1 , Pingqiang Cai 1 , Le Mei 2 , Yuan Cheng 3 , Yi Zeng 1 , Ming Wang 1 , Ting Wang 1 , Ying Jiang 1 , Baohua Ji 4, 5 , Dechang Li 4 , Xiaodong Chen 1
Advanced Materials ( IF 27.4 ) Pub Date : 2020-08-07 , DOI: 10.1002/adma.202003723 Liang Pan 1 , Pingqiang Cai 1 , Le Mei 2 , Yuan Cheng 3 , Yi Zeng 1 , Ming Wang 1 , Ting Wang 1 , Ying Jiang 1 , Baohua Ji 4, 5 , Dechang Li 4 , Xiaodong Chen 1
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Simultaneous implementation of high signal‐to‐noise ratio (SNR) but low crosstalk is of great importance for weak surface electromyography (sEMG) signals when precisely driving a prosthesis to perform sophisticated activities. However, due to gaps with the curved skin during muscle contraction, many electrodes have poor compliance with skin and suffer from high bioelectrical impedance. This causes serious noise and error in the signals, especially the signals from low‐level muscle contractions. Here, the design of a compliant electrode based on an adhesive hydrogel, alginate–polyacrylamide (Alg‐PAAm) is reported, which eliminates those large gaps through the strong electrostatic interaction and abundant hydrogen bond with the skin. The obtained compliant electrode, having an ultralow bioelectrical impedance of ≈20 kΩ, can monitor even 2.1% maximal voluntary contraction (MVC) of muscle. Furthermore, benefiting from the high SNR of >5:1 at low‐level MVC, the crosstalk from irrelevant muscle is minimized through reducing the electrode size. Finally, a prosthesis is successfully demonstrated to precisely grasp a needle based on a 9 mm2 Alg‐PAAm compliant electrode. The strategy to design such compliant electrodes provides the potential for improving the quality of dynamically weak sEMG signals to precisely control prosthesis in performing purposefully dexterous activity.
中文翻译：
具有超低生物电子阻抗的合规离子粘附电极。
在精确驱动假肢执行复杂活动时，同时实现高信噪比 (SNR) 和低串扰对于弱表面肌电 (sEMG) 信号非常重要。然而，由于肌肉收缩过程中与弯曲皮肤的间隙，许多电极与皮肤的顺应性差，并受到高生物电阻抗的影响。这会导致信号中出现严重的噪声和错误，尤其是来自低水平肌肉收缩的信号。在这里，报道了基于粘性水凝胶藻酸盐-聚丙烯酰胺（Alg-PAAm）的柔顺电极的设计，它通过强静电相互作用和与皮肤的丰富氢键消除了那些大间隙。获得的顺从电极具有≈20 kΩ的超低生物电阻抗，甚至可以监测2。肌肉的 1% 最大自主收缩 (MVC)。此外，受益于低水平 MVC 下 >5:1 的高 SNR，通过减小电极尺寸将来自无关肌肉的串扰降至最低。最后，成功地展示了一种假肢可以精确地抓住基于 9 毫米的针2 Alg-PAAm 兼容电极。设计这种顺应性电极的策略为提高动态弱 sEMG 信号的质量提供了潜力，以精确控制假肢执行有目的的灵巧活动。
更新日期：2020-09-21
中文翻译：
具有超低生物电子阻抗的合规离子粘附电极。
在精确驱动假肢执行复杂活动时，同时实现高信噪比 (SNR) 和低串扰对于弱表面肌电 (sEMG) 信号非常重要。然而，由于肌肉收缩过程中与弯曲皮肤的间隙，许多电极与皮肤的顺应性差，并受到高生物电阻抗的影响。这会导致信号中出现严重的噪声和错误，尤其是来自低水平肌肉收缩的信号。在这里，报道了基于粘性水凝胶藻酸盐-聚丙烯酰胺（Alg-PAAm）的柔顺电极的设计，它通过强静电相互作用和与皮肤的丰富氢键消除了那些大间隙。获得的顺从电极具有≈20 kΩ的超低生物电阻抗，甚至可以监测2。肌肉的 1% 最大自主收缩 (MVC)。此外，受益于低水平 MVC 下 >5:1 的高 SNR，通过减小电极尺寸将来自无关肌肉的串扰降至最低。最后，成功地展示了一种假肢可以精确地抓住基于 9 毫米的针2 Alg-PAAm 兼容电极。设计这种顺应性电极的策略为提高动态弱 sEMG 信号的质量提供了潜力，以精确控制假肢执行有目的的灵巧活动。
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