MLCu250已被证实是一种非常成功的节育器。然而为了改进避孕效果,采用一种铜的表面积从250mm~2增加到375mm~2的新节育器。早先研究结果指出这种改变有较好的避孕效果,而不增加副作用。在新加坡等处已经指出,在合法的早期流产后立即放置IUDs不增加操作的合并症,而且对那些后来不实行计划生育的病人提供一个好的避孕措施。本文对流产后立即放置MLCu250和MLCu375进行比较性的研究。作者1977年9月～1978年10月在计划生育门诊吸收549例患者为研究对象(274例放置MLCu250,275例放置MLCu375)。流产前她们以双盲法被分到其中的一种节育器。所有病人为早期流产,应用宫颈旁阻滞和吸刮术。吸宫后立即放置IUD,不常 MLCu250 has proven to be a very successful IUD. However, in order to improve the contraceptive effect, a new IUD with a copper surface area increased from 250 mm2 to 375 mm2 was used. Earlier studies indicated that such changes have better contraceptive effects without increasing side effects. It has been pointed out in Singapore et al. That the placement of IUD immediately after a legitimate early miscarriage does not increase the comorbidity of the operation and provides a good contraceptive for those who later did not practice family planning. This article comparative study of MLCu250 and MLCu375 placed immediately after abortion. From September 1977 to October 1978, 549 patients were recruited in the family planning clinic (274 patients with MLCu250 and 275 patients with MLCu375). Before abortion, they were assigned to one of the IUDs in a double-blind fashion. All patients had early abortion, cervical bypass and suction curettage. Place the IUD immediately after aspiration, not infrequently