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“Bionic Arm” Technology from the Rehabilitation Institute of Chicago

June 28th, 2005 Medgadget Editors Neurology, Orthopedic Surgery, Rehab

Mr. Jesse Sullivan is the world's first Bionic ManMr. Jesse Sullivan is the world’s first “Bionic Man”, according to the Rehabilitation Institute of Chicago (RIC). In May 2001, Mr. Sullivan lost both of his upper extremities as a result of an accident. The technology that allows this patient to control his artificial arms has been developed by RIC’s Neural Engineering Center for Artificial Limbs (NECAL).

Developed within the Neural Engineering Center for Artificial Limbs (NECAL) at RIC, Dr. Todd Kuiken, MD, PhD, pioneered the muscle reinnervation procedure which takes an amputee’s own nerves and connects them to a healthy muscle. In this case, four of Mr. Sullivan’s nerves were dissected from the shoulder and transferred to the muscles of his chest. Doing so allows the user to move his or her prosthetic arm as if it were a real limb–by simply thinking about what they want the arm to do. The “Bionic Arm,” or myoelectric arm, is driven using electrical signals from the muscles of the chest, now activated by the user’s own thought-generated nerve impulses. These impulses are sensed, via surface electrodes, from the pectoral muscle and carried through to the mechanical arm, causing the arm to move.
NECAL uses nerve-muscle grafts in amputees to gain added control signals for an artificial arm. Doctors take nerves that used to go to the arm and move those nerves onto chest muscles. The nerves grow into the chest muscles, so when the patient thinks “close hand,” a portion of his chest muscle contracts and electrodes that detect this muscle activity tell the computerized arm when to close the hand. Thus, the patient thinks “close hand” and his artificial hand closes…
Researchers at RIC have learned that although the limb is lost with an amputation, the control signals to that limb remain accessible in the residual peripheral nerves. Grafting the residual nerves of an upper-limb amputee to spare muscles produces additional control signals, allowing for simultaneous operation of multiple functions in an externally powered prosthesis with a more natural feel than is possible with conventional prostheses.
The “Bionic Arm” technology has been very successful so far in both significantly improving the function of artificial limbs as well as allowing the skin to be reinnervated with nerves form the arm. The first patient to undergo the new procedure, Jesse Sullivan, has experienced significant improvements in the functioning of his prosthetic arms. While previously moving his artificial arms was slow and cumbersome, today he is able to do many of the routine tasks he took for granted before his accident, including putting on socks, shaving, eating dinner, taking out the garbage, carrying groceries and vacuuming.

More at the Rehabilitation Institute of Chicago (part of the Northwestern University Feinberg School of Medicine)…
Video…

Medgadget Editors

Medical technologies transform the world! Join us and see the progress in real time. At Medgadget, we report the latest technology news, interview leaders in the field, and file dispatches from medical events around the world since 2004.

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