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宫内节育器（IUD）是广泛采用的避孕工具，我国大部分已婚育龄妇女使用IUD。为提高IUD．的避孕效果，探讨带环妊娠原因，本文对230例放置IUD失败导致妊娠的妇女进行了调查分析。临床资料与方法从1991年2月至1993年1月对来我院妇产科门诊放置IUD失败导致妊娠者共230例进行了调查
IUD is a widely used contraceptive tool, most of our married women of reproductive age use IUD. To improve IUD. Of the contraceptive effect, to explore the causes of pregnancy with ring, this article 230 cases of IUD failed to place the cause of pregnancy were investigated and analyzed. Clinical data and methods From February 1991 to January 1993 came to our hospital obstetrics and gynecology outpatient placement IUD failure led to a total of 230 cases of pregnancy were investigated