AAOS: Paralysed patients get new chance at movement -
[Cached Version]
Published on: 11/27/2000
Last Visited: 3/12/2001
Dr. Michael W. Keith described advances under way at the Cleveland FES ( functional electrical stimulation ) Centre , a consortium that includes the Cleveland Veterans' Administration Medical Centre , Case Western Reserve University and MetroHealth Medical Centre , all in Cleveland.Using implanted neuroprostheses , persons with upper extremity weakness can now use their hands to write , hold objects and express themselves , said Dr. Keith , professor of orthopedics and biomedical engineering at Case Western Reserve University.He described a hand-grasp neuroprosthesis incorporating surgically implanted sensors , wireless technology , radio frequencycommunication and micro-processor technologies.Requiring an assortment of external hardware and a surgical procedure , the device is implanted in the chest with leads to electrodes in peripheral muscles.A shoulder position sensor outside the body relays a voluntary movement to an external computer , which then transmits a signal back inside the body to activate various muscles.This allows people to become independent and to use their hands to control their environment , to make voluntary movements-often for the first time since their injury..He also described a joint angle transducer , an implantable device that replaces the external shoulder position sensor with an electronic motion sensor that can be placed anywhere within the body.Detecting changes in magnetic fields , the sensor causes movements of the hand.By implanting double systems , patients are able to achieve bilateral hand-grasp ability.
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Within the next decade , said Dr. Keith , these devices will be the standard of care for persons with quadriplegia or paraplegia.These people will no longer be considered paralysed , but will be able to do ordinary activities and will be visualized as people with normal function..