In a preferred embodiment, an inflatable wheelchair cushion, the cushion including: a base member having a shape complementary to that of a sling-type wheelchair seat; a plurality of fluid-fillable cells rising from the base member, top surfaces of the cells, when the cells are filled with...http://www.google.co.uk/patents/US5839140?utm_source=gb-gplus-sharePatent US5839140 - Inflatable wheelchair cushion and methods of manufacturing and use
