最早的含铜宫内节育器(IUD)足Cu7和TCu,不久就被广泛使用。含铜IUD在置入后的第1、2年和随后的几年里比惰性IUD的受孕率低。IUD是通过干扰卵子到达宫腔前的生殖过程起避孕作用,铜可能增加了这一作用。最早的两种含铜IUD(Cu7和TCu)有200mm~2表面积的铜,以薄铜线的形式缠绕在节育器的柄上。这些节育器的铜线仅厚0.2mm,长期使用有时 The earliest copper intrauterine devices (IUDs), Cu7 and TCu, were widely used. Copper IUDs had lower conception rates than inactive IUDs in the first, second, and subsequent years after implantation. IUD acts as a contraceptive to the reproductive process by interfering with the egg before reaching the uterine cavity, and copper may have increased this effect. The first two copper-containing IUDs (Cu7 and TCu) with 200 mm2 surface area were wound on the handle of the IUD as thin copper wire. These IUDs are only 0.2mm thick copper, long-term use sometimes