Wrap-Around Wearable Coils for Seamless Monitoring of Joint Flexion
Wrap-Around Wearable Coils for Seamless Monitoring of Joint Flexion
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DOI：
10.1109/tbme.2019.2895293
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发表时间：
2019-10-01
影响因子：
4.6
通讯作者：
Kiourti, Asimina
中科院分区：
文献类型：
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作者：
Mishra, Vigyanshu;Kiourti, Asimina
目的：我们介绍并验证了一类新的可穿戴线圈，无缝监测关节屈曲在个人的自然环境中，同时克服缺点，在国家的最先进的。方法：我们的方法依赖于法拉第的感应定律，并采用环绕发射和接收线圈，得到角度失调的关节屈曲。结果：铜和e-螺纹弹簧圈的模拟和体外测量结果非常一致。作为概念验证，考虑圆柱形臂模型，并确认监测0度-130度活动范围的可行性。34 MHz的工作频率被认为是最佳的，从而降低了功率要求，提高了角分辨率，并对组织介电特性变化具有极强的鲁棒性。性能基准测试与最先进的惯性测量装置相比显示出等同或上级性能，特别是对于大于20度的屈曲角。设计准则和安全考虑也进行了探讨。结论：与“黄金标准”的基于相机的运动捕捉相反，所报道的方法并不局限于人为的环境。同时，它不会受到积分漂移的影响（与惯性测量单元不同），它不需要视线（与飞行时间传感器不同），并且它不会限制自然关节运动（与弯曲传感器不同）。重要性：报告的方法被设想为无缝集成到服装，并最终重新定义目前关节屈曲监测的方式。这为康复、运动、手势互动等提供了前所未有的机会。
Objective: We introduce and validate a new class of wearable coils that seamlessly monitor joint flexion in the individual's natural environment while overcoming shortcomings in state-of-the-art. Methods: Our approach relies on Faraday's law of induction and employs wrap-around transmit and receive coils that get angularly misaligned as the joint flexes. Results: Simulation and in vitro measurement results for both copper and e-thread coils are in excellent agreement. As a proof-of-concept, a cylindrical arm model is considered and feasibility of monitoring the 0 degrees-130 degrees range of motion is confirmed. The operation frequency of 34 MHz is identified as optimal, bringing forward reduced power requirements, enhanced angular resolution, and extreme robustness to tissue dielectric property variations. Performance benchmarking versus state-of-the-art inertial measurement units shows equivalent or superior performance, particularly for flexion angles greater than 20 degrees. Design guidelines and safety considerations are also explored. Conclusion: Contrary to "gold-standard" camera-based motion capture, the reported approach is not restricted to contrived environments. Concurrently, it does not suffer from integration drift (unlike inertial measurement units), it does not require line-of-sight (unlike time-of-flight sensors), and it does not restrict natural joint movement (unlike bending sensors). Significance: The reported approach is envisioned to be seamlessly integrated into garments and, eventually, redefine the way joint flexion is monitored at present. This promises unprecedented opportunities for rehabilitation, sports, gestural interaction, and more.