有触觉反的直接假肢力量控制可能与内部模型连接.
Nabeel Hasan Chowdhury1,2, Susan Schramfield1,2, Patrick Pariseau1,2
1Department of Biomedical Engineering, Case Western Reserve University, Cleveland, OH, United States.
medRxiv : the preprint server for health sciences
|December 23, 2024
概括
外周神经刺激 (PNS) 为假肢控制提供触觉反,但运动纠正仍然具有挑战性. 这项研究探讨了肢体差异的个体在对象操纵任务中的PNS有效性,揭示了通过设备和刺激增强来改善控制的潜力.
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
- 康复机器人 康复机器人
背景情况:
- 动态握力调制涉及脑干和皮质控制,脑干机制对不完善的反具有坚固性.
- 周围神经刺激 (PNS) 提供触觉反 (强度,位置),但不能完全复制自然触觉.
- 皮质神经系统可以在感知前的水平上与运动系统集成,但它对运动纠正的有效性需要进一步研究.
研究的目的:
- 调查PNS在对象操纵任务中促进运动纠正的有效性,对于一个有中半径上肢差异的个体.
- 在不同的假肢控制条件下 (力与速度) 分析握力调节,肌肉活动和运动动力学,有和没有触觉刺激.
主要方法:
- 一名肢体差异的参与者使用了一只装有袖口电极的假肢手用于PNS.
- 任务涉及物体在障碍物上的运动,测量手的运动,握力和肌肉信号 (EMG).
- 测试了四种条件:带/不带刺激的力控制和带/不带刺激的速度控制.
主要成果:
- 直接力控制显示与举起但不降低物体的相关性,与完整的手不同.
- 随着力量控制和刺激,假肢的滑落/掉落显著增加,这表明握力松动的问题.
- 电磁图谱分析显示了预期的握力调节,刺激有助于意识到力值,特别是在较低的设置下.
结论:
- 参与者的解码意图表明,试图减少握力,与完整的手行为保持一致,但假肢限制阻碍了输出.
- 需要在假肢设计中进行改进,以便更精细地调整抓地力,并增强PNS来信号滑动力.
- 刺激可能会提高位置意识和信心,但目前的系统需要改进才能进行有效的运动纠正.
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