| 摘要 |
A support structure is provided which effects a pressure equalisation. It comprises an enclosure (2) filled with a large number of loose pieces (5). In a special embodiment the loose pieces (5) are surrounded by a low friction material (6), such as nylon fabric, and are made of a deformable material, preferably foam-material. Another embodiment provides balloon-shaped pieces. Further an outer cover (1) surrounding the enclosure (2) may be provided. |
