加铜于宫内节育器上已证明有加强避孕作用虽已有报告。对经产妇和初产妇中使用铜 T220C(T-Cu220C)和多负荷250(MLCu250)有高的避孕效果。然而在铜含量和设计新型节育器方面所作的改进至今还不能成功地解决中止使用的问题。因此估价目前那一种含铜节育器最有效及最可接受是很有必要的。本文报告多中心随机前瞻性对比研究三种宫内节育器 Cu7,TCu220C,MLCu250的情况并征得三所大学中心的病人和医生对三种节育器在可接受 Adding copper in the IUD has been shown to enhance contraceptive effects have been reported. High contraceptive use of copper T220C (T-Cu220C) and heavy duty 250 (MLCu250) for mothers and primipara. However, improvements in copper content and the design of new IUDs have so far not been able to successfully solve the problem of discontinuation. Therefore, it is necessary to evaluate the current most effective and acceptable copper-based IUD. This paper reports a multicenter prospective randomized prospective study of three intrauterine devices Cu7, TCu220C, MLCu250 and obtained three university centers of patients and doctors on the three IUDs in an acceptable