A professor from the Tokyo Institute of Technology developed a robotic device that could be attached to an arm and be used for rehabilitation of non-working joints at home. Called the Tail-wrist-II, the device prevents the loss of retractility in patients with half of their bodies paralyzed. Having the option of doing rehabilitation at home on their own rather than going to hospitals or hiring professionals would be economically advantageous to patients.

The device is fitted onto a patient's arm and controlled by a joystick which can be maneuvered by the unaffected arm (or another person in case of full-body paralysis). The joystick adjusts the air pressure inside the helical tube that runs along the length of the Tail-wrist-II to induce movement. This particular device was designed for wrists only, but the same principle could be used to manufacture similar devices for legs. In the future, the creator aims to develop a system that could let professionals in hospitals remotely control the device via the Internet.