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Double amputee Jason Koger, 34, of Owensboro, Ky., accompanied by prosthetist for Advanced Arm Dynamics, Ryan Spill, demonstrates his i-limb ultra revolution prosthetic hands during an interview with the Associated Press, Thursday, May 2, 2013, in Philadelphia. Koger, a husband and father of three who lost his limbs in an accident, can now activate with an iPhone app 24 different grip patterns for his new hands. (AP Photo/Matt Rourke)

New app programs bionic hands

The Boston Marathon bombings, which wounded more than 260 people

including many with serious leg injuries, have shined a light on the

advances in prostheses. The i-limb ultra revolution, a prosthetic developed by the British firm Touch Bionics, has made huge strides in allowing amputees to program different hand grip patterns via iphone app.