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When Kuniholm returned to his design shop, Tackle Design, he brought along three prosthetic arms given to him at Walter Reed Medical Center — the same body-operated hook many veterans have used since World War I, a shorter utility prosthetic, and a new, state-of-the-art myoelectric arm. Each one had its drawbacks — and when Kuniholm and his Tackle Design colleagues disassembled them, they quickly concluded that they could improve on the designs.
They founded the Open Prosthetics Project, an open-source collaboration that makes its innovations available to anyone. And Kuniholm signed on with Revolutionizing Prosthetics, an initiative of the Defense Advanced Research Projects Agency, or DARPA.