| 摘要 |
A mattress (10) to relieve pressure and shear forces and inhibit the formation of decubitus ulcers includes a foam body having a generally planar surface to be supported on a rigid surface such as the carriage of a bed and an upper support surface (14) on which an individual lies. The foam body includes a contoured base (18) having upstanding side rails (22, 26) formed of dense foam material and a central body portion (12) on the base and extending between the side rails. The central body portion is partitioned into a head supporting zone (30), a foot supporting zone (34) and a mid-section supporting zone (32). The head and foot supporting zones include an upper layer of very soft foam (42, 62) and a bottom layer (40, 64) of firmer foam. In the foot supporting region, the bottom layer (64) forms a cantilever to support the calves of an individual while the heels of the individual are only supported by the soft foam of the top layer. The mid-section supporting zone is contoured and is divided into a plurality of freely moving individual cells (60) to reduce the shear force between an individual and the mattress when the individual moves or the carriage is adjusted. Preferably, inserts (28) formed of foam material more resilient than the base and side rails are provided in the side rails to facilitate folding of the mattress about transverse fold lines. |
