Imperceptive and reusable dermal surface EMG for lower extremity neuro-prosthetic control and clinical assessment

• Published in: Npj flexible electronics Vol. 7; no. 1; pp. 49 - 11
• Main Authors: Park, Jaeu, Jeong, Jinwoong, Kang, Minseok, Pritish, Nagwade, Cho, Youngjun, Ha, Jeongdae, Yea, Junwoo, Jang, Kyung-In, Kim, Hyojin, Hwang, Jumin, Kim, Byungchae, Min, Sungjoon, Kim, Hoijun, Kwon, Soonchul, Pak, ChangSik John, Suh, HyunSuk Peter, Hong, Joon Pio, Lee, Sanghoon
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 25-10-2023; Nature Publishing Group; Nature Portfolio
• Subjects: 631/1647/1453; 639/301/1005; 639/301/923/1028; Amputation; Chemistry and Materials Science; Design optimization; Durability; Dynamic pressure; Electrodes; Electromyography; Electronics and Microelectronics; Instrumentation; Materials Science; Optical and Electronic Materials; Perspiration; Polymer Sciences; Prostheses; Robot control; Sensors; Signal to noise ratio; Stretchability; Substrates
• ISSN: 2397-4621; 2397-4621
• DOI: 10.1038/s41528-023-00282-z

Surface electromyography (sEMG) sensors play a critical role in diagnosing muscle conditions and enabling prosthetic device control, especially for lower extremity robotic legs. However, challenges arise when utilizing such sensors on residual limbs within a silicon liner worn by amputees, where dynamic pressure, narrow space, and perspiration can negatively affect sensor performance. Existing commercial sEMG sensors and newly developed sensors are unsuitable due to size and thickness, or susceptible to damage in this environment. In this paper, our sEMG sensors are tailored for amputees wearing sockets, prioritizing breathability, durability, and reliable recording performance. By employing porous PDMS and Silbione substrates, our design achieves exceptional permeability and adhesive properties. The serpentine electrode pattern and design are optimized to improve stretchability, durability, and effective contact area, resulting in a higher signal-to-noise ratio (SNR) than conventional electrodes. Notably, our proposed sensors wirelessly enable to control of a robotic leg for amputees, demonstrating its practical feasibility and expecting to drive forward neuro-prosthetic control in the clinical research field near future.