Alternating pressure system prevents decubitus ulcers Still a current and proven system for the prevention of pressure sores: 2 separate air chambers are automatically alternately inflated and deflated, shifting the pressure on the patient’s body at regular intervals. In this way, 50 % of the pressure is shifted, preventing the development of decubitus ulcers. As well as this, the alternating pressure massages the back and promotes blood circulation. Made of a strong plastic material, which can be wiped clean with antibacterial disinfectants. It is recommended that a sheet be placed between the patient and the mattress. With straps at each end for securing it to the mattress.