An alternating pressure mattress has two sets (A, B) of cells, which are inflated and deflated cyclically and in sequence, to provide alternating support for a patient. Each set (A, B) has central transverse cells (11a, 11b) and side forming cells (14a, 14b). The central cells (11a, 11b) provide a central...http://www.google.sh/patents/US7784130?utm_source=gb-gplus-sharePatent US7784130 - Alternating pressure mattresses
