Gadget created by US researchers won’t be available to the public for some time, but has the potential to help disabled and elderly peopleThe market is undoubtedly there. Country strolls. Visits to museums. Weekend shopping trips. How much easier they would be wearing an unpowered, lower-leg, carbon fibre exoskeleton.Though cumbersome to say, the device itself is sleek and simple, using only a spring, wire and clutch mounted on a carbon fibre frame to take some of the slog out of bipedal locomotion.