Biodegradable prostheses, surgical grafts and implants all being made from artificial materials and for use in tissue reconstruction; biodegradable surgical grafts and implants all being made from artificial materials and for use in tissue reconstruction; surgical grafts and implants all being made from artificial materials which are porous and for use in tissue reconstruction; surgical grafts and implants made from artificial materials in the form of foam, sheet or mesh for use in repair and...