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本文用B超对264倒置宫内节育器（IUD）者行连续26个月的监测，用周长描记法测量宫腔内膜线长度与IUD下缘至宫颈内口间距。对未妊娠的243例进行统计处理，得出两者之间的相关系数r=0．4275及直线回归方程y=0．3079＋0．4023x，x为宫腔内膜线长度，y为IUD下线至宫颈内四间距的安全值。本组264例中14例带器妊娠者，其间距均小于安全值。因此对登IUD者测得宫腔内膜线长度，计算出安全值，对小于该值的须采取相应措施，避免带器妊娠。
In this paper, B-264 on the inverted inverted intrauterine device (IUD) line for 26 consecutive months of monitoring, measuring the length of the uterine endometrial line and IUD lower edge to the cervix within the mouth distance. Statistical analysis of 243 cases of non-pregnancy, obtained a correlation coefficient between the two r = 0.4275 and linear regression equation y = 0.3079 + 0.4023x, x is the endometrial line length, y is the IUD down To the four cervical spine safety. The group of 264 cases of 14 cases with pregnancy, the spacing is less than the safety value. Therefore, IUD measured IUD endometrial line length, calculate the safety value of less than the value of the need to take appropriate measures to avoid pregnancy with the device.