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随着科学的发展,各种新型的宫内避孕器不断出现。当前,国外最引人注目的是长效黄体酮宫内避孕器、甲地孕酮硅橡胶避孕环等含有避孕药物的新型避孕器。这类缓慢释放低剂量的孕激素等药物宫内避孕器,其显著的特点是既具有普通宫内避孕器阻止孕卵着床和发育的功能,又具有避孕药物直接作用于子宫内膜,使之不利于孕卵生长发育。因药物只在局部起作用,所以全身反应很小。 长效黄体酮宫内避孕器,每天恒速释放黄体酮65μg,避孕可维持一年以上,有效率在98％左右。实验证明,释放出的低剂量黄
With the development of science, a variety of new intrauterine devices continue to appear. Currently, the most notable abroad is the long-acting progesterone intrauterine device, megestrol silicone syrup and other contraceptives containing contraceptives. Such slow release of low doses of progestin and other drugs intrauterine device, its notable features are both ordinary intrauterine device to prevent pregnancy egg implantation and development of the function, but also has a direct effect of contraceptives on the endometrium, so that The detrimental to the growth and development of eggs. Because the drug only works locally, so systemic response is small. Long-term progesterone intrauterine device, constant release of progesterone 65μg daily, contraception can be maintained for more than a year, the efficiency of about 98%. Experiments show that the release of low-dose yellow