The pump mattress comprises 16 polyurethane air bags, with control lines running below and connected to an electrical pump. The air bags are divided into two groups, in which the air is automatically changed every four minutes. As the bags in one group deflate and contract, those in the other are inflated and expand. This pattern equalizes pressure on all parts of the patient's body.
為了調整壓力，氣墊床是由十六管ＰＵ氣囊組成，下面有管線貫穿，連接電控幫浦，分Ａ、Ｂ兩組，每隔四分鐘自動換氣，一管消氣、一管漲氣，循環交錯下，讓病人的身體各部位可以受壓平均，床墊還不時成固定角度傾斜，等於替病人翻身，可以有效預防褥瘡。