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Ｂ型超声能准确可靠地测出宫内节育器（ＩＵＤ）在宫腔内的位置，为提高其续存率，必须从手术开始，即术时提高ＩＵＤ到位率，术后随访要及时发现下移、部分脱落等异常情况并处理，应用Ｂ超对宫腔内ＩＵＤ监护是一种理想的监测手段。本研究对３００名育龄妇女手术前及术后即刻应用Ｂ超测得子宫各径线共１０个，术后定期随访复测上述径线并与首测值比较，结果本地区妇女ＩＵＤ上缘到宫底之距离＞２０ｍｍ或随访时比首测值＞５ｍｍ者，可诊断为ＩＵＤ下移的参考标准。
B-type ultrasound can accurately and reliably measure the IUD position in the uterine cavity, in order to improve its survival rate, it is necessary to start from the surgery, that is, IUD to increase the operative rate, postoperative follow-up should be promptly found Move, partial shedding and other abnormalities and treatment, the application of B-ultrasound intrauterine IUD monitoring is an ideal means of monitoring. In this study, 300 women of childbearing age before surgery and immediately after application of ultrasound measured by the uterine line a total of 10, after regular follow-up retest of the above-mentioned diameter and comparison with the first test results in the region IUD the edge to Palace at the end of the distance> 20mm or follow-up than the first measurement> 5mm who can be diagnosed as IUD down the reference standard.