Patent ID: 7373678

Claim:
A contoured seat cushion for supporting a person in a seated position thereon, the person having a pelvic area with bony prominences and tissue masses spaced from the bony prominences, the tissue masses including posterior lateral buttocks, comprising: a support structure made from a resilient material, the support structure including generally opposite front and rear sides, generally opposite left and right sides, a bottom surface extending between the front and rear sides and between the left and right sides, and a top surface generally opposite of the bottom surface and extending between the front and rear sides and the left and right sides; the top surface configured as a support contour defining relief areas and support areas, the relief areas positioned to align with the bony prominences of a person when the person is seated on the cushion, and the support areas positioned to align with the tissue masses of the posterior lateral buttocks; an insertion member; openings formed in each of the rear corners between the top surface and the bottom surface of the support structure to receive the insertion member, the openings positioned between the top surface and the bottom surface, and a support area of the support contour changing position relative to other support areas or relief areas when the insertion member is inserted into one of the openings; a cover made from a substantially non-stretchable material, the cover sized to encase the support structure to resist substantial outward deformation of the support structure when the person is seated on the seat cushion; and an expansion portion of the cover positioned adjacent to the rear corner to expand the cover at the corner to fit around the support structure when the insertion member is inserted in the opening, the expansion portion including a zipper and a gusset, the zipper opening to allow the gusset to expand, and the zipper closing to contract the gusset.