2008 Design of Medical Devices Conference Abstracts

Electromyogram-Triggered Functional Electrical Stimulation-Assisted Walking After Partial Paralysis OPEN ACCESS

[+] Author and Article Information
Anirban Dutta, Rudi Kobetic, Ronald Triolo

 Case Western Reserve University and Motion Study Laboratory, Louis Stokes Cleveland VA Medical Center, Cleveland, OH 44106 USA

J. Med. Devices 2(2), 027565 (Jul 02, 2008) (1 page) doi:10.1115/1.2936207 History: Published July 02, 2008


Objective: Functional Electrical Stimulation (FES) triggered by manual switch provides brace-free ambulation to wheelchair dependent individuals with spinal cord injuries. An electromyogram (EMG)-based trigger can enhance the coordination between FES-assisted and volitional actions. This study evaluated the gait speed modulation and coordination of the actions of the EMG-triggered FES with the volitional movements during stand-to-walk transition after incomplete spinal cord injury. Methods: two incomplete spinal cord injured (iSCI) subjects (iSCI1: 24years, C7 motor & C6 sensory; iSCI2: 34years, T1 motor & C5 sensory) volunteered for this study. Four able-bodied volunteers provided the normative gait data. The Vicon WorkstationTM (Vicon Peak, USA) software acquired lower-body kinematics data using a seven camera motion capture system during stand-to-walk transition. The FES-assisted swing-phase in iSCI subjects was triggered with three command interfaces—manually triggered with a switch, triggered with EMG-based GED, triggered automatically at a user-selected rate. Results and Discussion: The Euclidean distance from origin of the perturbations of 18 joint angles and 18 joint velocities during stand-to-walk transition converged towards zero. It was found from the Mahalanobis distances between each pair of group means that the EMG-triggered FES-assisted iSCI gait was closest to the able-bodied normative gait clusters.

Copyright © 2008 by American Society of Mechanical Engineers
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