Pressure Ulcer (PU) is a life-threatening wound caused by lack of movement. PU emerges when body tissues are pressed between bones and mattress surface for a period of time as short as 2 hours. Moreover, this disease is very killing. It is like a crack: It grows fast and gets bigger in size and depth. People getting PU undergo a painful experience. When it comes to wheelchair users, the pain is much awful. According to statistics, 58% of all wheelchair users around the world get PU at least once in their life. Furthermore, the prevalence of pressure ulcers significantly increased with time post injury (11.5% at year 1 rising to 21% at year 15). As wheelchair users cannot often moved from their wheelchair, the pressure on the wound cannot be removed. As a consequence, they experience more pain, the duration of their treatment will be longer, and it costs more for them.