Patent ID: 7803395

Claim:
An implantable device for promoting tissue ingrowth therein comprising: a reticulated, resiliently-compressible, elastomeric matrix comprising a continuous network of solid structures defining a void space therein, wherein said void space comprises a plurality of interconnected pores forming a continuous network of intercommunicating passageways extending from an interior portion to an exterior surface of said matrix, wherein said matrix comprises a biocompatible, cross-linked polycarbonate polyurethane-urea formed by a reaction of a mixture comprising: (i) a polycarbonate polyol, and (ii) an isocyanate component comprising at least about 5% by weight of said isocyanate component of 2,4′-diphenylmethane diisocyanate, and wherein said matrix is substantially free of isocyanurate linkages.