| 摘要 |
The present invention relates to a seat cushion assembly for use, in particular, in a wheelchair. The assembly includes a sculpted or molded foam base having exterior sidewalls profiled to accommodate a wheelchair frame, a nd a seating surface to provide some positioning support to the occupant. Further, the base includes a well area to be positioned under the ischial tuberosities of the occupant and including means for the removable attachmen t of a flexible envelope containing a fluid filling material. The envelope is comprised of upper and lower elastomeric sheet materials sealed about the perimeter. It is divided by internal seal sections so as to inhibit fluid migration within the envelope. These internal seals define a tapering flow orifice which provide for gradual restriction of a flow channel to permit fl ow so as to avoid failure inhibiting fluid migration. The envelope has a surfac e area which exceeds the surface area of the well and includes attachment mean s on the bottom side to encourage a gathering of the envelope into the well fo r proper cushioning effect. In addition, the assembly can include a rigidizer to enable the cushion to be used in a sling-type wheelchair seat. |
