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首页> 外文期刊>Journal of Materials Engineering and Performance >An EMG-Controlled SMA Device for the Rehabilitation of the Ankle Joint in Post-Acute Stroke
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An EMG-Controlled SMA Device for the Rehabilitation of the Ankle Joint in Post-Acute Stroke

机译：肌电图控制的SMA装置，可用于急性卒中后踝关节的康复

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The capacity of flexing one’s ankle is an indispensible segment of gait re-learning, as imbalance, wrong compensatory use of other joints and risk of falling may depend on the so-called drop-foot. The rehabilitation of ankle dorsiflexion may be achieved through active exercising of the relevant musculature (especially tibialis anterior, TA). This can be troublesome for patients affected by weakness and flaccid paresis. Thus, as needs evolve during patient’s improvements, a therapeutic device should be able to guide and sustain gradual recovery by providing commensurate aid. This includes exploiting even initial attempts at voluntary motion and turns those into effective workout. An active orthosis powered by two rotary actuators containing NiTi wire was designed to obtain ankle dorsiflexion. A computer routine that analyzes the electromyographic (sEMG) signal from TA muscle is used to control the orthosis and trigger its activation. The software also provides instructions and feed-back for the patient. Tests on the orthosis proved that it can produce strokes up to 36° against resisting torques exceeding 180 Ncm. Three healthy subjects were able to control the orthosis by modulating their TA sEMG activity. The movement produced in the preliminary tests is interesting for lower limb rehabilitation, and will be further improved by optimizing body-orthosis interface. It is hoped that this device will enhance early rehabilitation and recovery of ankle mobility in stroke patients.
机译：屈曲踝关节的能力是步态重新学习中必不可少的部分，因为不平衡，错误地使用其他关节进行补偿以及跌倒的风险可能取决于所谓的“落脚”。踝背屈的康复可通过积极锻炼相关肌肉组织（特别是胫前肌，TA）来实现。对于受虚弱和松弛性瘫痪影响的患者可能会很麻烦。因此，随着患者改善期间需求的发展，治疗设备应能够通过提供相应的帮助来指导并维持逐渐的康复。这包括甚至利用自愿运动的最初尝试，并将其转变为有效的锻炼。一个主动矫形器由两个包含NiTi线的旋转执行器提供动力，旨在获得踝背屈。分析来自TA肌肉的肌电图（sEMG）信号的计算机例程用于控制矫形器并触发其激活。该软件还为患者提供说明和反馈。矫形器的测试证明，它可以产生最大36°的行程，抵抗超过180 Ncm的扭矩。三名健康受试者能够通过调节其TA sEMG活性来控制矫形器。初步测试中产生的运动对于下肢康复很有趣，并且将通过优化人体矫形器界面来进一步改善。希望该设备将促进中风患者的早期康复和踝关节活动度的恢复。

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