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首页> 外文期刊>IFAC PapersOnLine >An Inertial Sensor-based Trigger Algorithm for Functional Electrical Stimulation-Assisted Swimming in Paraplegics
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An Inertial Sensor-based Trigger Algorithm for Functional Electrical Stimulation-Assisted Swimming in Paraplegics

机译：基于惯性传感器的截瘫互补辅助游泳的基于惯性传感器的触发算法

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Functional electrical stimulation (FES) is used to support gait in stroke patients and to induce cycling motions in paralyzed legs. In the current contribution, we present a method that, for the first time, enables FES-supported swimming in paraplegics. The proposed setup includes a waterproof stimulator, cables, and electrodes. In preliminary experiments, flexion and extension movements of the knee were generated in a completely paralyzed subject to support the propulsion. Furthermore, transcutaneous spinal cord stimulation (tSCS) is used to get a straight swimming position and to reduce spasticity of the lower extremities. The developed setting remained dry and safe during all sessions. The first trials revealed the need for a synchronization of the patient’s arm movements with the artificially induced leg movements to prevent undesired rolling movements of the swimmer. To enable such a synchronized swimming, a trigger algorithm was developed that is based on the roll angle and angular velocity of the trunk. By experimental validation, it was demonstrated that a functional stimulation pattern can be generated during front crawl movements of the upper body. The new setup and methods are currently being tested during the STIMSWIM pilot study with paraplegics. The preliminary results of the first two subjects show an improvement of the swimming speed of approximately 15% for FES/tSCS assisted swimming compared to non-assisted swimming and a clear training effect over the first 7 sessions.
机译：功能电刺激（FES）用于支持中风患者的步态，并在瘫痪的腿部诱导循环运动。在目前的贡献中，我们介绍了一种方法，这是第一次启用FES支持的游泳。所提出的设置包括防水刺激器，电缆和电极。在初步实验中，在完全瘫痪的受试者中产生膝关节的屈曲和延伸运动以支持推进。此外，经皮脊髓刺激（TSCs）用于获得直的游泳位置并减少下肢的痉挛。在所有会话期间，发达的设置保持干燥和安全。第一次试验揭示了患者臂运动的需要与人工诱导的腿部运动同步，以防止游泳运动员的不期望的滚动运动。为了实现这样的同步游泳，开发了一种基于行李箱的滚角和角速度的触发算法。通过实验验证，证明可以在上半身的前爬行运动期间产生功能刺激图案。目前在Stimssssssss试点研究中测试了新的设置和方法，与截瘫。与非辅助游泳相比，前两个受试者的初步结果表明，对于FES / TSCs辅助游泳，对FES / TSCs的游泳速度约为15％，而不是在前7次会议上的明确培训效果。

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