Song, Kang-Il Chu, Jun-Uk Park, Sunghee E. Hwang, Dosik Youn, Inchan 2024-01-20T02:00:25Z 2024-01-20T02:00:25Z 2021-09-01 2017-04 0018-9294 https://pubs.kist.re.kr/handle/201004/122890 Cuff electrode recording has been proposed as a solution to obtain robust feedback signals for closed-loop controlled functional neuromuscular stimulation (FNS) systems. However, single-channel cuff electrode recording requires several electrodes to obtain the feedback signal related to each muscle. In this study, we propose an ankle-angle estimation method in which recording is conducted from the proximal nerve trunk with a multichannel cuff electrode to minimize cuff electrode usage. In experiments, muscle afferent signals were recorded from a rabbit's proximal sciatic nerve trunk using a multichannel cuff electrode, and blind source separation and ankle-angle estimation were performed using fast independent component analysis (PP/FastICA) combined with dynamically driven recurrent neural network (DDRNN). The experimental results indicate that the proposed method has high ankle-angle estimation accuracy for both situations when the ankle motion is generated by position servo system or neuromuscular stimulation. Furthermore, the results confirm that the proposed method is applicable to closed-loop FNS systems to control limb motion. English IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC CUFF RECORDINGS ELECTRICAL-STIMULATION INFORMATION PERONEAL FEEDBACK SIGNALS WAVELET FORCE Ankle-Angle Estimation from Blind Source Separated Afferent Activity in the Sciatic Nerve for Closed-Loop Functional Neuromuscular Stimulation System Article 10.1109/TBME.2016.2580705 1 IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING, v.64, no.4, pp.834 - 843 IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING 64 4 834 843 scie scopus 000398738300011 2-s2.0-85017651191 Engineering, Biomedical Engineering Article CUFF RECORDINGS ELECTRICAL-STIMULATION INFORMATION PERONEAL FEEDBACK SIGNALS WAVELET FORCE Ankle-angle estimation artificial neural network blind source separation functional neuromuscular stimulation (FNS) system multichannel cuff electrode muscle afferent neural signal