a description is given of a domed cap for the enlargement of an atrophied bladder , in biocompatible and absorbable material including a textile made with yarns or with monofilaments deriving from pga fibers , characterized in that the textile is supported by a star - shaped frame with domed profile , formed by a plurality of radial strips manufactured by injection of a pga / pla copolymer , the cap being suitable for growing thereon autologous fibrous capsule cells , generated by the process of tissue reconstruction , after its insertion inside the patient .