Urinary bladder prostheses for subcutaneous implantation, comprising a flexible liquid reservoir (1) essentially tubular, - whose wall contains at least two layers of material, - which has an anterior side and a posterior side, - than at the ends It has two openings (2) for the inflow of liquid and - which has at least one opening (3) for the discharge of liquid, - the openings (2 and 3) being stabilized or rigidly configured such that they are suitable for fixing of valve elements or flexible tube elements and - a check valve being arranged in each of the openings (2) or a check valve being arranged in one of the openings (2) and the other opening (2) being closed with a closure cap, - the outer layer (4) of the liquid reservoir wall being composed of a biologically inert material, preferably of an organic polymer, in particular polyester, preferably polyethylene terephthalate, preferably Dacron®, and - the inner layer (5) being of the smooth liquid tank wall and said inner layer (5) being composed of a chemically inert material, preferably of an organic polymer, in particular silicone, characterized in that - the layers of material of the wall of the liquid reservoir (1) are connected to each other in matter entrainment, - in at least one of the openings (3) there is a valve element that can be operated manually or a flexible tube element containing a valve that can be operated manually.Prótesis de vejiga urinaria para la implantación subcutánea, que comprende un depósito de líquido flexible (1) en esencia tubular, - cuya pared contiene al menos dos capas de material, - que tiene un lado anterior y un lado posterior, - que en los extremos laterales presenta dos aberturas (2) para la afluencia de líquido y - que presenta al menos una abertura (3) para la descarga de líquido, - estando las aberturas (2 y 3) estabilizadas o configuradas rígidas de tal manera que son adecuadas para la fijación de elementos de válvula o elementos de tubo flexible y - estando dispuesta
