An artificial sphincter comprises at least two elements (2) associated with each other and hollow for containing a pressurized fluid; said elements (2) being adapted to be arranged on the sides of the urethra of a patient and have a substantially semi-conical shape; each element (2) has a respective contact surface (3) with the urethra of substantially semi-cylindrical shape.Un esfínter artificial comprende por lo menos 2 elementos (2) asociados entre sí y huecos para contener un fluido presurizado; tales elementos (2) se adaptan para disponerse en los lados de la uretra de un paciente y tener una forma sustancialmente semi-cónica; cada elemento (2) tiene una superficie de contacto (3) con la uretra de forma sustancialmente semi-cónica.