Double amputee Jason Koger demonstrated the i-limb ultra revolution prosthetic hand in Philadelphia last week, using an iPhone app to choose from 24 grip patterns. Previously, Koger, who lost his hands in a 2008 accident, required a visit to a prosthetist to program his artificial hand. The i-limb enables independent movement of the fingers and thumbs, says Ryan Spill, Koger's prosthetist who works with Advanced Arm Dynamics in Philadelphia.

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