宫内节育环是当前我国育龄妇女最常用的避孕工具。我国采用节育环避孕已有30余年的历史,大量临床观察证明,它是一种安全、有效、简便、经济,取出后不影响生育,深受广大妇女欢迎的一种避孕措施。节育环的效果是肯定的,其避孕的机理目前尚未完全清楚,现在主要认为它作为一宫内异物存在,妨碍了受精卵的着床,同时由于宫内节育环的存在,使子宫 IUD is currently the most commonly used contraception for women of childbearing age in our country. China has adopted contraceptive ring contraception for more than 30 years, and a large number of clinical observations have proved that it is a contraceptive method that is safe, effective, simple and economical, does not affect fertility after being taken out and is widely welcomed by the majority of women. Birth control ring effect is affirmative, the contraceptive mechanism is not yet fully understood, and now mainly that it exists as an intrauterine foreign body, hinder the fertilized egg implantation, at the same time due to the presence of intrauterine control ring, so that the uterus