| abstract |
PCT No. PCT/AU91/00160 Sec. 371 Date Nov. 27, 1991 Sec. 102(e) Date Nov. 27, 1991 PCT Filed Apr. 24, 1991 PCT Pub. No. WO91/16010 PCT Pub. Date Oct. 31, 1991A composite living skin equivalent is described comprising an epidermal layer of cultured keratinocyte cells, a layer of non-porous collagen, and a dermal layer of cultured fibroblast cells in a porous cross-linked collagen sponge matrix. Preferably the non-porous collagen is Type 1, Type 3 or mixtures of Types 1 and 3 bovine collagen, which has been pepsin treated. A process for preparing the skin equivalent is described, as well as a test kit for in vitro testing of the skin equivalent. The skin equivalent has use for skin grafting as well as in vitro testing of the effects of various substances on skin. +RR The questions raised in reexamination request No. 90/003,418, filed Apr. 25, 1994, have been considered and the results thereof are reflected in this reissue patent which constitutes the reexamination certificate required by 35 U.S.C. 307 as provided in 37 CFR 1.570(e). |