The Principle of the Micro-Electronic Neural Bridge and a Prototype System Design.
The micro-electronic neural bridge (MENB) aims to rebuild lost motor function of paralyzed humans by routing movement-related signals from the brain, around the damage part in the spinal cord, to the external effectors. This study focused on the prototype system design of the MENB, including the principle of the MENB, the neural signal detecting circuit and the functional electrical stimulation (FES) circuit design, and the spike detecting and sorting algorithm. In this study, we developed a novel improved amplitude threshold spike detecting method based on variable forward difference threshold for both training and bridging phase. The discrete wavelet transform (DWT), a new level feature coefficient selection method based on Lilliefors test, and the k-means clustering method based on Mahalanobis distance were used for spike sorting. A real-time online spike detecting and sorting algorithm based on DWT and Euclidean distance was also implemented for the bridging phase. Tested by the data sets available at Caltech, in the training phase, the average sensitivity, specificity, and clustering accuracies are 99.43%, 97.83%, and 95.45%, respectively. Validated by the three-fold cross-validation method, the average sensitivity, specificity, and classification accuracy are 99.43%, 97.70%, and 96.46%, respectively.
Zong-Hao
ZH
Huang
Zhi-Gong
ZG
Wang
Xiao-Ying
XY
Lu
Wen-Yuan
WY
Li
Yu-Xuan
YX
Zhou
Xiao-Yan
XY
Shen
Xin-Tai
XT
Zhao
D000465:Algorithms; D032701:Biomimetics / Q000295:instrumentation*; D003195:Computer Communication Networks / Q000295:instrumentation*; D003199:Computer Systems; D004599:Electric Stimulation Therapy / Q000295:instrumentation*; D004569:Electroencephalography / Q000295:instrumentation*; D004581:Electronics / Q000295:instrumentation*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005240:Feasibility Studies; D008904:Miniaturization; D010865:Pilot Projects; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*; D013813:Therapy, Computer-Assisted / Q000295:instrumentation