Here is an exoskeleton that mimics the human knee, enabling paraplegics to move over uneven terrains easier. It has mechanical variable impedance, allowing the user to adapt to unexpected obstacles. The device will have several buttons with various modes (including straight-walking, stairs, and sit-down modes).
VariLeg 2 is expected to be more streamlined and lightweight. Engineers from ETH Zurich are behind this solution. Reuters has more on the story.