Home oxygen therapy (HOT) patient always needs to carry an oxygen cylinder at the time of going out. The present oxygen cylinder is not necessarily lightweight, and if it unites with a conveyance cart, it becomes as mass of about 5 kg. And this load becomes burden and reasons of giving up going out physically and mentally. So, in this paper, we describe the power assistive robotic cart development which carries the oxygen cylinder to reduce the load of HOT patients.
