Robotic exoskeleton helps regain limb function

26 February 2007

A robotic exoskeleton controlled by nerve signals could help people with partial nervous system impairment to regain limb function.

University of Michigan researchers developed an ankle exoskeleton and tested it on healthy subjects to measure how the device affected ankle function. The  results suggest promising applications for rehabilitation and physical therapy, and a similar approach could be used by other groups who develop such technology.

"This could benefit stroke patients or patients with incomplete injuries of the spinal cord," said Daniel Ferris, associate professor in movement science at the University of Michigan (UM). "For patients that can walk slowly, a brace like this may help them walk faster and more effectively."

Ferris and former UM doctoral student Keith Gordon, who is now a post-doctoral fellow at the Rehabilitation Institute of Chicago, showed that the wearer of the UM ankle exoskeleton could learn how to walk with the exoskeleton in about 30 minutes. Additionally, the wearer's nervous system retained the ability to control the exoskeleton three days later.

In people with spinal injuries or some neurological disorders, electrical signals sent by the brain to control muscles don't arrive at full strength and are uncoordinated. In addition, patients are less able to keep track of exactly where and how their muscles move, which makes re-learning movement difficult.

Typically, robotic rehabilitative devices are worn by patients so that the limb is moved by the brace, which receives its instructions from a computer. Such devices use repetition to help force a movement pattern.

The University of Michigan robotic exoskeleton works the opposite of these rehabilitation aids. In the UM device, electrodes were attached to the wearer's leg and those electrical signals received from the brain were translated into movement by the exoskeleton.

"The (artificial) muscles are pneumatic. When the computer gets the electrical signal from the (wearer's) muscle, it increases the air pressure into the artificial muscle on the brace," Ferris said. "Essentially the artificial muscle contracts with the person's muscle."

Initially the wearer's gait was disrupted because the mechanical power added by the exoskeleton made the muscle stronger. However, in a relatively short time, the wearers adapted to the new strength and used their muscles less because the exoskeleton was doing more of the work. Their gait normalized after about 30 minutes.

The next step is to test the device on patients with impaired muscle function, Ferris said.

The complete paper, "Learning to Walk with a Robotic Ankle Exoskeleton" is available online at the Journal of Biomechanics: (link direct to article is too long to reproduce!)

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