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IUDs的抗生育作用机制迄今仍不明瞭,可能与改变或抑制精子在女性上生殖道内移行,受精和卵子输送有关,抑制受精和卵子输送可能比由于子宫内膜生物化学和组织学变化而防止受精卵着床的作用更为重要。新的含铜IUDs,如TCu220C等使用一年或二年后证实比早期的Cu7等更有显著的避孕效果。使用IUDs和异位妊娠之间没有因果关系。子宫穿孔率低于1/2000。终止使用IUDs,生育力迅速恢复。
The mechanism of anti-fertility of IUDs remains unclear and may be related to altering or inhibiting sperm migration, fertilization and egg delivery in the female upper genital tract. Inhibition of fertilization and egg delivery may prevent fertilization more than biochemical and histological changes due to endometrium The role of egg implantation is more important. New copper-containing IUDs, such as TCu220C, have been shown to have significantly more contraceptive effects than the earlier ones, such as Cu7, after one or two years of use. There is no causal relationship between using IUDs and ectopic pregnancy. Uterine perforation rate of less than 1/2000. Terminate the use of IUDs, fertility rapid recovery.