Closed-loop neuromuscular electrical stimulation using feedforward-feedback control and textile electrodes to regulate grasp force in quadriplegia

Transcutaneous neuromuscular electrical stimulation is routinely used in physical rehabilitation and more recently in brain-computer interface applications for restoring movement in paralyzed limbs. Due to variable muscle responses to repeated or sustained stimulation, grasp force levels can change...

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Bibliographic Details
Published in:Bioelectronic medicine 2019-11, Vol.5 (1), p.19-19, Article 19
Main Authors: Ciancibello, John, King, Kevin, Meghrazi, Milad Alizadeh, Padmanaban, Subash, Levy, Todd, Ramdeo, Richard, Straka, Malgorzata, Bouton, Chad
Format: Article
Language:English
Subjects:
Batteries
Control algorithms
Electrodes
Experiments
Neuromuscular electrical stimulation
Paralysis
Sensors
Short Report
Spinal cord injuries
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Summary:Transcutaneous neuromuscular electrical stimulation is routinely used in physical rehabilitation and more recently in brain-computer interface applications for restoring movement in paralyzed limbs. Due to variable muscle responses to repeated or sustained stimulation, grasp force levels can change significantly over time. Here we develop and assess closed-loop methods to regulate individual finger forces to facilitate functional movement. We combined this approach with custom textile-based electrodes to form a light-weight, wearable device and evaluated in paralyzed study participants. A textile-based electrode sleeve was developed by the study team and Myant, Corp. (Toronto, ON, Canada) and evaluated in a study involving three able-body participants and two participants with quadriplegia. A feedforward-feedback control structure was designed and implemented to accurately maintain finger force levels in a quadriplegic study participant. Individual finger flexion and extension movements, along with functional grasping, were evoked during neuromuscular electrical stimulation. Closed-loop control methods allowed accurate steady state performance (
ISSN:2332-8886
2332-8886
DOI:10.1186/s42234-019-0034-y