Patent ID: 8308817

Claim:
A prosthetic liner having a closed distal end, an open proximal end, an outer surface, and an opposite inner surface, the liner for use in prosthetic and orthopedic devices and comprising: a frictional layer formed from a hydrophobic elastomer material and located along the entirety of the inner surface of the liner, the frictional layer defining a plurality of apertures located along the inner surface, the material of the frictional layer having skin tackiness properties; a porous polymer foam layer in communication with the inner surface and directly laminated to the frictional layer, the porous polymer foam layer is a three-dimensional woven synthetic material including discrete portions of a moisture-absorbing material, the apertures of the frictional layer permitting a transfer of air from the inner surface to the porous polymer foam layer; and a cushioning base layer adhered to the porous polymer foam layer and having greater rigidity than the porous polymer foam layer, the base layer forms a liquid and vapor impervious outer surface of the liner; wherein the porous polymer foam layer is a continuous layer extending between the proximal and distal ends of the liner with the base layer extending over the length of the porous polymer foam layer, the porous polymer foam layer permitting a transfer of air from the inner surface of the liner through a thickness of the porous polymer foam layer and out from the proximal end of the liner, wherein the base layer is close-ended at the distal end of the liner, and defines a close-ended conical shape, and wherein the base layer conforms to the shape of the porous polymer foam layer, wherein the base layer is laminated onto the porous polymer foam layer, thereby the frictional layer, the porous polymer foam layer, and the base layer forming a tri-layered laminate structure.