在非人类灵长类动物中长期植入的宏电极的电力复原
K P O'Sullivan1, M E Orazem2, K J Otto3,4,5,6,7
1Department of Biomedical Engineering, University of Utah, 36 S Wasatch Dr, Salt Lake City, UT 84112, United States of America.
Journal of neural engineering
|June 11, 2024
概括
在非人类灵长类动物中,电复原有效地通过减少阻抗和改善信号质量来恢复大脑电极的性能. 这种技术显示出增强脑计算机接口和治疗刺激系统的前景.
科学领域:
- 神经科学是一个神经科学.
- 生物医学工程 生物医学工程
- 植入式电极技术 植入式电极技术
背景情况:
- 脑电极的慢性植入导致电极-组织接口 (ETI) 的变化,增加阻抗和降低信号质量.
- 这些ETI变化对记录的信号噪声比 (SNR) 和刺激的能量传递产生了负面影响,这对于闭环系统至关重要.
- 之前的研究表明,电复苏可以在动物微电极中恢复SNR,但其在使用临床宏电极的大型动物模型中的有效性尚未测试.
研究的目的:
- 在一个大型动物模型 (非人类灵长类动物) 中,对临床相关的宏电极设计中测试电力复苏的有效性.
- 描述优化交流和直流电力复原方法的参数.
- 用电化学阻抗光谱 (EIS) 纵向评估复原对电极-组织接口 (ETI) 的影响.
主要方法:
- 在长期植入非人类灵长类动物 (NHP) 的外周电皮造影 (ECoG) 和深脑刺激 (DBS) 电极上评估了交流和直流电力复苏.
- 使用电化学阻抗光谱法 (EIS) 来测量阻抗,并在再生前,之后和纵向后对ETI进行表征.
- 采用随机错误建模和克莱默斯-克罗尼格关系来评估阻抗数据的可靠性和测量静止性.
主要成果:
- 在所有测试的电极类型中,交流和直流电力复原都迅速降低了电极阻抗和ETI的组织部件.
- 电流和低频交流复原显示出最显著的阻抗降低和ETI改进,可以在尼奎斯特图中观察到.
- 单次复苏疗程的有益影响持续了几天至一周以上,在NHP中没有观察到不良行为变化.
结论:
- 使用临床相关的宏电极设计,电力复原有效地减轻NHP中的慢性ETI变化.
- 这种技术为长期神经记录和刺激应用提供了维持电极性能的可行策略.
- 这些发现提供了关键的初步数据,用于将电复苏转化为人类临床应用.
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