The present Invention relates to novel intrauterine Systems and Methods for Manufacturing such systems. Intrauterine system according to the invention includes a Tank and a continuous, closed.LA PRESENTE INVENCIÓN SE REFIERE A NUEVOS SISTEMAS INTRAUTERINOS Y A MÉTODOS PARA FABRICAR TALES SISTEMAS. UN SISTEMA INTRAUTERINO DE ACUERDO CON LA INVENCIÓN COMPRENDE UN DEPÓSITO Y UN MARCO CONTINUO, CERRADO.