| 摘要 |
A flotation-type, low-pressure-gas (or fluid) cushion for the prevention of pressure sores is provided, which has a plurality of longitudinal compartments, wherein outer compartments are of much greater size than the inner compartments, and communicate with the inner compartments by restrictive passageways. When a user sits upright on the cushion, a substantially lower pressure is exerted on the coccygeal and anal/genital regions, relative to other regions. The larger outer compartments extend past the hips and trochanters of the user, thus increasing the area of surface contact, relative to prior art cushions. A modification of the cushion includes a surrounding envelope which contains fluid, but at a lower pressure than the fluid or gas pressure of the inner cushion. The additional outer fluid system exerts a relatively low, equalizing pressure on all portions of the contacted anatomy of the user. The inner cushion continues to exert differential pressure. The resultant pressure on the coccygeal and anal/genital regions equals approximately only the pressure of the outer system, whereas the pressure on other regions of the anatomy, such as the ischial tuberosities, equals the sum of the pressures of the respective systems. The said sum of the pressures generally is less than half the pressure ordinarily exerted against the ischial tuberosities by a folding wheelchair, flexible sling-type seat.
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