Artifact-free sensory nerve signals obtained from cuff electrodesduring functional electrical stimulation of nearby muscles
Haugland, M.K.; Hoffer, J.A.
Rehabilitation Engineering, IEEE Transactions on
Volume 2, Issue 1, Mar 1994 Page(s):37 - 40
Digital Object Identifier 10.1109/86.296344
Summary:Restoration of the voluntary use of paralyzed limbs using
functional neuromuscular stimulation (FNS) is limited by complex muscle
properties and unpredictable load behaviors; closed-loop control of FNS
would improve performance but requires reliable sensory feedback
modalities. Sensory nerve signals recorded by cuff electrodes provide
accurate information about forces acting on the skin in anesthetized
animals; however, nerve cuff signals are very small (approximately 10
μV), and during FNS they become contaminated with large stimulation
artifacts and synchronous EMG potentials from nearby muscles. The
authors show in this study that it is possible to record neural signals
from the cat tibial nerve without interference from distributed
stimulation of four calf muscles surrounding the recording electrode by
use of high-pass filtering and synchronized bin-integration. Nerve
signals sampled in this way retained all the information about footpad
contact force that was normally obtained in the absence of muscle
stimulation. The authors propose that this approach has wide
applicability for rehabilitation of paralyzed people with neural
prostheses
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