Yoshiyuki Sankai at the University of Tsukuba has developed an exoskeleton for a single arm that can improve the strength and utility of aging limbs.

The device consists of a tabard worn over the shoulders with a motorized exoskeleton for one arm attached. The exoskeleton senses the angle, torque and nerve impulses in the arm and then assists the user to move his or her shoulder and elbow joints accordingly.