An orthotopic artificial bladder endoprosthesis includes a base obtained with a multi-layered silicone membrane having an external surface and an internal surface both coated with pyrolytic turbostratic carbon a resorbable cap obtained with a PGA fiber fabric, the base and the cap being connected with each other along respective edges to define a closed enclosure the base is connectable to the urethra and to the ureters of a patient the base also being of substantially triangular form.
