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this video has been circulating on the internet in the past couple of months, showing how engineers at the Nemours/Alfred I. duPont Hospital for Children used a 3D printer and the power of elastic bands to create an exoskeleton that helps a small girl lift her arms.

http://www.youtube.com/watch?v=WoZ2BgPVtA0

how does the mechanism work?

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by the way, this seemed to be the most approriate stack exchange to ask the q on, please feel free to suggest somewhere else! – significance Sep 15 '12 at 23:24
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"this seemed to be the most approriate stack exchange" Maybe, maybe not, but it isn't really on topic. Almost certainly they are spring loaded so that the unloaded action is to pull the child's arms gently in the direction she is unable to move them herself---then she need only relax to lift them and pull gently down to depress them. – dmckee♦ Sep 16 '12 at 3:22

closed as off topic by dmckee♦ Sep 16 '12 at 3:22

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