The Hybrid Assistive Limb (also known as HAL) is a powered exoskeleton suit developed by Japan's Tsukuba University and the robotics company Cyberdyne. It is designed to support and expand the physical capabilities of its users, particularly people with physical disabilities. There are two primary versions of the system: HAL 3, which only provides leg function, and HAL 5, which is a full-body exoskeleton for the arms, legs, and torso. In 2011, Cyberdyne and Tsukuba University jointly announced that hospital trials of the full HAL suit would begin in 2012, with tests to continue until 2014 or 2015. By October 2012, HAL suits were in use by 130 different medical institutions across Japan. In February 2013, the HAL system became the first powered exoskeleton to receive global safety certification. In August 2013, HAL received EC certification for clinical use in Europe as the world's first non-surgical medical treatment robot. In addition to its medical applications, the HAL exoskeleton has been used in construction and disaster response work. History The first HAL prototype was proposed by Yoshiyuki Sankai, a professor at Tsukuba University. Fascinated with robots since he was in the third grade, Sankai had striven to make a robotic suit in order "to support humans". In 1989, after receiving his PhD in robotics, he began the development of HAL. Sankai spent three years, from 1990 to 1993, mapping out the neurons that govern leg movement. It took him and his team an additional four years to make a prototype of the hardware. The third HAL prototype, developed in the early 2000s, was attached to a computer. Its battery alone weighed nearly and required two helpers to put on, making it very impractical. By contrast, later HAL-5 model weighs only and has its battery and control computer strapped around the waist of the wearer. Cyberdyne began renting the HAL suit out for medical purposes in 2008. By October 2012, over 300 HAL suits were in use by 130 medical facilities and nursing homes across Japan. The suit is available for institutional rental, in Japan only, for a monthly fee of US$2,000. In December 2012, Cyberdyne was certified ISO 13485 – an international quality standard for design and manufacture of medical devices – by Underwriters Laboratories. In late February 2013, the HAL suit received a global safety certificate, becoming the first powered exoskeleton to do so. In August 2013, the suit received