The present invention describes the intrauterine application of 18-methyl-15ß, 16ß-methylene-19-nor-20-spirox-4-en-3-one systems of the general formula (1), where R6 and R7 denote hydrogen or a methylene group, for the treatment of menorrhagia, generally uterine bleeding, as well as an intrauterine system for the stated application containing a compound of formula (1).Uso intrauterino de 18-metil-15ß, 16ß-metilen-19-nor-20-espirox-4- en-3-onas de fórmula general (1) (ver Fórmula) en donde R6 y R7 son hidrógeno o un grupo metileno, para el tratamiento de la menorragia, de hemorragias intrauterinas en general, y un sistema intrauterino para dicho uso, que comprende un compuesto de fórmula 1.
