宫内避孕器自1928年德国妇科专家Evnest Grafenberg创用以来,迄今已有五十余年历史,它仍为目前广泛使用的安全、可靠、简便易行的避孕方法,并为许多妇女乐于接受。但其作用机理,尚未彻底明瞭,各种学说,未得统一,主要有下列几种: 一、惰性宫内避孕器的作用机理: 1.改变宫腔内环境:根据Haire等的意 IUD, which has been in use for more than 50 years now since its creation in 1928 by German gynecologist Evnest Grafenberg, remains the safe, reliable and easy-to-use contraceptive method widely used today and is open to many women. However, its mechanism of action, not yet completely clear, a variety of doctrines, not uniform, there are several main: First, the mechanism of inert IUD: 1. To change the intrauterine environment: According to Haire et al