A Functional Electrical Stimulator to Enable Grasping Through Wrist Flexion

Q4 Biochemistry, Genetics and Molecular Biology International Journal of Biology and Biomedical Engineering Pub Date : 2022-01-10 DOI:10.46300/91011.2022.16.4
S. Mahendra, Viswanath Talasila, A. G. Dutt, Mukund Balaji, Abhishek C. Mouli
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Abstract

Functional electrical stimulation is an assistive technique that utilizes electrical discharges to produce functional movements in patients suffering from neurological impairments. In this work, a biphasic, programmable current- controlled functional electrical stimulator system is designed to enable hand grasping facilitated by wrist flexion. The developed system utilizes an operational amplifier based current source and is supported by a user interface to adjust stimulation parameters. The device is integrated with an accelerometer to measure the degree of stimulated movement. The system is validated, firstly, on two passive electrical loads and subsequently on four healthy volunteers. The device is designed to deliver currents between 0-30mA, and the error between the measured current and simulated current for two loads were -0.967±0.676mA and -0.995±0.97mA. The angular data from the accelerometer provided information regarding variations in movement between the subjects. The architecture of the proposed system is such that it can, in principle, automatically adjust the parameters of simulation to induce the desired movement optimally by measuring a stimulated movement artifact (e.g., angular position) in real time.
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一种通过手腕弯曲实现抓握的功能性电刺激仪
功能性电刺激是一种辅助技术,利用放电为患有神经损伤的患者产生功能性运动。在这项工作中,设计了一个双相、可编程电流控制的功能性电刺激器系统,以实现通过手腕弯曲促进抓握。所开发的系统利用基于运算放大器的电流源,并由用户界面支持以调整刺激参数。该设备与加速度计集成,用于测量受刺激运动的程度。该系统首先在两个无源电气负载上进行了验证,随后在四名健康志愿者身上进行了测试。该设备设计用于输送0-30mA的电流,两个负载的测量电流和模拟电流之间的误差分别为-0.967±0.676mA和-0.995±0.97mA。加速度计的角度数据提供了受试者之间运动变化的信息。所提出的系统的架构使得其原则上可以通过实时测量受激运动伪像(例如,角位置)来自动调整模拟的参数,以最优地诱导期望的运动。
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来源期刊
International Journal of Biology and Biomedical Engineering
International Journal of Biology and Biomedical Engineering Biochemistry, Genetics and Molecular Biology-Biochemistry, Genetics and Molecular Biology (all)
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期刊介绍: Topics: Molecular Dynamics, Biochemistry, Biophysics, Quantum Chemistry, Molecular Biology, Cell Biology, Immunology, Neurophysiology, Genetics, Population Dynamics, Dynamics of Diseases, Bioecology, Epidemiology, Social Dynamics, PhotoBiology, PhotoChemistry, Plant Biology, Microbiology, Immunology, Bioinformatics, Signal Transduction, Environmental Systems, Psychological and Cognitive Systems, Pattern Formation, Evolution, Game Theory and Adaptive Dynamics, Bioengineering, Biotechnolgies, Medical Imaging, Medical Signal Processing, Feedback Control in Biology and Chemistry, Fluid Mechanics and Applications in Biomedicine, Space Medicine and Biology, Nuclear Biology and Medicine.
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