The present invention relates to novel intrauterine systems and to methods for manufacturing these systems. An intrauterine system according to the invention comprises a reservoir and a continuous, closed and flexible frame.Linvention concerne de nouveaux systèmes intra-utérins et des procédés de fabrication de ces systèmes. Le système intra-utérin de linvention comprend un réservoir et une structure continue, fermée et flexible.