Electrodes placed along the spine helped two stroke patients regain control of their hands and arms almost immediately.
. It represents a promising new technique for restoring voluntary movement to those left with upper-body paralysis following strokes, the team says.
Strokes cause paralysis because the connection between the brain and the spinal cord is damaged; the brain tries to tell the spinal cord to move certain muscles, but the message is muddled. By aligning the electrodes on the device with sensory nerves, “we can enhance the activation of muscles that are weakened by the stroke,” Douglas Weber, an engineer and neuroscientist at Carnegie Mellon University in Pittsburgh, said at the news conference. Pulses from these electrodes seek to amplify signals from the brain, so that the sensory nerves respond by activating muscles, restoring voluntary body control to patients.
After a series of strokes nine years ago, Heather Rendulic lost the use of her left arm and hand. Now, thanks to an implanted device that sends electrical pulses into spinal nerves, she has regained some function. Here, she feeds herself and sorts blocks while the device is on, but has trouble doing those tasks when the stimulation is turned off. The implant sends electrical pulses into spinal nerves, circumventing the damaged connection between the brain and the spinal cord.
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