26 February 2015

Brain Controlled Bionic Reconstruction

Three Austrian men have become the first in the world to undergo a new technique called ‘bionic reconstruction’ enabling them to use a robotic prosthetic hand controlled by their mind. All three men suffered for many years with brachial plexus injuries and poor hand function as a result of motor vehicle and climbing accidents. The new technique was developed by researchers at the Medical University of Vienna, together with engineers from the Department of Neurorehabilitation Engineering of the University Medical Center Goettingen. It combines selective nerve and muscle transfers, elective amputation, and replacement with an advanced robotic prosthesis using sensors that respond to electrical impulses in the muscles. Following comprehensive rehabilitation, the technique restored a high level of function, in all three recipients, aiding in activities of daily living. Brachial plexus avulsion injuries represent an inner amputation, irreversibly separating the hand from neural control. Existing surgical techniques for such injuries are crude and ineffective and result in poor hand function. Researchers were able to create and extract new neural signals via nerve transfers amplified by muscle transplantation.

These signals were then decoded and translated into solid mechatronic hand function. Before amputation, all three patients spent an average of 9 months undergoing cognitive training, firstly to activate the muscles, and then to use the electrical signals to control a virtual hand. Once they had mastered the virtual environment, they practiced using a hybrid hand -- a prosthetic hand attached to a splint-like device fixed to their non-functioning hand. Three months after amputation, robotic prostheses gave all three recipients substantially better functional movement in their hands, improved quality of life, and less pain. For the first time since their accidents all three men were able to accomplish various everyday tasks such as picking up a ball, pouring water from a jug, using a key, cutting food with a knife, or using two hands to undo buttons. Brachial plexus injuries occur when the nerves of the brachial plexus -- the network of nerves that originate in the neck region and branch off to form the nerves that control movement and sensation in the upper limbs, including the shoulder, arm, forearm, and hand -- are damaged. Brachial plexus injuries often occur as a result of trauma from high speed collisions, especially in motorcycle accidents, and in collision sports.

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