There's a reason you've never seen fully autonomous exoskeletons that help the disabled walk without crutches: Building one is crazy hard. But the founders of a Paris-based startup called Wandercraft are uniquely qualified to do it. They're roboticists who happen to have loved ones in wheelchairs, giving them both the expertise and motivation to develop an exoskeleton that helps users walk again. After years of development, they're nearly ready to show it to the public, following a round of promising patient trials.

Wandercraft ran successful preliminary trials with a handful of clients using "Atalante," its latest prototype. "There was such a strong emotional response from our test subjects," said Managing Director Matthieu Masselin. "For a lot of them, it was the first time they had been able to walk since their accidents."

A lot of companies have tried to develop exoskeletons for paraplegics, but models from Ekso Bionics, ReWalk and others require crutches, which heavily stress patients' shoulder muscles. That limits training and rehab sessions, as patients often need days to recover from muscle fatigue.