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Logo for the Journal of Rehab R&D
Volume 41 Number 3B, May/June 2004
Pages 461 — 472

Simulated neuroprosthesis state activation and hand-position control using myoelectric signals from wrist muscles
Jayme S. Knutson, MS; Harry A. Hoyen, MD; Kevin L. Kilgore, PhD; P. Hunter Peckham, PhD
Department of Biomedical Engineering, Case Western Reserve University, Cleveland, OH; Center of Excellence
in Functional Electrical Stimulation, Louis Stokes Cleveland Department of Veterans Affairs Medical Center,
Cleveland, OH; Department of Orthopaedics, MetroHealth Medical Center, Cleveland, OH
Abstract — This paper reports on the initial phase of feasibility testing of a control strategy that uses myoelectric signals (MES) from wrist flexor and extensor muscles to control a hand-grasp neuroprosthesis for C7 tetraplegia. The control strategy was customized to the MES patterns produced during wrist flexion, extension, and relaxation for five able-bodied subjects and two individuals with C7 spinal cord injury. We evaluated the reliability with which the subjects could deliberately activate target neuroprosthesis states and control the degree of opening and closing of a computer-simulated hand using the myoelectric control strategy. Every subject was able to activate at least 99% of the target states for at least 1 continuous second, enough time to prove the activation was deliberate and to achieve significant hand opening or closing. Additionally, every subject was able to control the opening and closing of the simulated hand with enough proficiency to match greater than 87% of the target hand positions for at least 2 continuous seconds. Most of the inadvertent disturbances in simulated hand position were of a magnitude less than 10% of full range of motion for every subject. Future studies will incorporate the control strategy into an electrical stimulation system that opens and closes the hand of an individual with C7 tetraplegia.

Key words: control algorithm, functional electrical stimu-lation, myoelectric control, neuroprosthesis, spinal cord injury,tetraplegia..

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