World's first mind-controlled bionic hands

One of the patients displaying their new prosthetic limb
One of the patients displaying their new prosthetic limb

DOCTORS have performed the world's first "bionic hand reconstructions" - replacing a hand disabled by injury with a prosthetic that the patient can control with their mind.

The three Austrian patients who underwent the procedure are now able to pick up objects, pour water, use a key and do up buttons with their artificial limb.

Several patients around the world have now been fitted with bionic hands to replace lost or missing limbs, and a small number have been able to control them with signals from the brain.

But the new procedure differs as the patients involved had been left with a functionless hand because of damage to the nervous system, and had to consent to doctors amputating their damaged limb in order to replace it with a prosthetic.

Signals from the brain to the lower arm can, in rare cases, be cut off following a high-speed collision trauma injury, especially in motorcycle crashes or in rugby.

Doctors at the Medical University of Vienna were able to create new nervous signals by transferring nerves and muscles from other parts of the body into the arm.

The signal restored was still insufficient to make the wasted muscle work usefully again. However, patients were trained to use a so-called "hybrid hand": a prosthetic attached to splints on their damaged hand, which required only a weak nerve signal to enable movement.

Once they had mastered this, patients were offered the choice of having their functionless hand amputated and replaced with a more sophisticated prosthetic.

Professor Oskar Aszmann, a pioneer in bionic surgery who led the latest procedures, said in the three patients who underwent the full procedure, the results were an improvement on existing surgical techniques.

"The scientific advance here was that we were able to create and extract new neural signals via nerve transfers amplified by muscle transplantation," he said. "These signals were then translated into solid mechatronic hand function."

The outcome of the procedures, carried out at Vienna's Christian Doppler Laboratory for Restoration of Extremity Function, and assisted by engineers from the University Medical Centre Göttingen, are published in The Lancet today. Dr Stefan Salminger, who also worked on the new technique, said the prosthesis was a "helping hand" that enabled patients to perform daily tasks, with both hands much better than before.

"It's a valid treatment," he said. "But only if the patient wants it from a psychological point of view. We can't force anyone to do this - it's losing a hand. Although functionless, it's your hand. The biggest issue for patients will be whether they are ready to go through this process." 

Last year a Danish patient became the first to receive a bionic hand that could feel texture and the shape of objects.

Topics:  disability health prosthetic limb

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