宫内节育器(IUD)是一种安全、有效、简便、经济的节育措施。对于IUD作用机理的研究,近年来报道日趋增多,但其确切的作用机理尚未完全阐明。争论之一为带器妇女卵子是否受精,胚泡是否着床。Landesman等认为,有相当比例数带器妇女体内可以受精并能形成胚泡和着床,但着床后发生自然流产,其依据是利用放射免疫测定法在若干带器妇女相当于着床期后可测出人绒毛膜促性腺激素(HCG)。对此,近来亦有作者持相反意见。如Aubert等采用灵敏、准 IUD is a safe, effective, simple and economical method of birth control. The research on the mechanism of IUD has been reported more and more in recent years, but its exact mechanism of action has not yet been fully elucidated. One of the controversies is whether or not a woman’s egg is fertilized and whether the blastocyst is implanted. According to Landesman et al., A significant proportion of digital women are fertile and capable of forming blastocysts and implantation, but spontaneous abortion occurs after implantation based on the use of radioimmunoassay Human chorionic gonadotropin (HCG) can be detected. In this regard, recently, some authors hold the opposite view. Such as Aubert and other sensitive, accurate