A new pressure measurement system with self-inflatable balloon, Kikuhime (TT Medi Trade, Soleddet 15, DK 4180 Soro), was used to measure the interface pressure between the body and the support surface. The instrument was composed of two self-inflatable air-filled balloons, a connecting tube, and a measuring unit. The small, flexible, air-filled pressure bladder has a dimension of 30 × 38 mm and is about 3 mm thick when calibrated to zero and the other one is of 120 × 100 mm.