Intrauterine use 18 - methyl - 14B, 16B - methylene - 19 nor espirox 20 - - 4 - - 3 - onas; intrauterine system contains 18 Methyl 14B, 16B - methylene - 19 nor espirox 20 - - 4 - - 3 - onas and its use in contraception and Gynecological Therapy.

摘要

The present invention describes intrauterine use of 18-methyl-15,16-methylene-19-nor-20-spirox-4-en-3-ones of the general formula (1) in contraception and gynaecological treatment, and an intrauterine system comprising compounds of formula 1.