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1968年国外开始应用聚硅橡胶制成避孕阴道环(Contraceptive vaginal ring,CVR)。以二甲聚硅氧烷制成的 CVR 无毒。环内含类固醇药物释出后,在阴道内迅速被吸收,进入血循环,使血浆内类固醇水平维持一定浓度,以达到避孕目的。其优点为有效且简便,可由使用者自己放置和取出,无不适感;药物长期稳定释出而无全身性或局部性不良副作用;有效率及持续使用率较高。CVR 的性状与药效大小及形状
In 1968, foreign countries began to use silicone rubber contraceptive vaginal ring (Contraceptive vaginal ring, CVR). CVR made of dimethicone is non-toxic. After the release of the steroid-containing drug in the ring, it is rapidly absorbed in the vagina and enters into the blood circulation to maintain a certain concentration of steroid in the plasma in order to achieve the purpose of contraception. Its advantages are effective and simple, can be placed and removed by the user, without discomfort; long-term stable drug release without systemic or local adverse side effects; high efficiency and continuous use. CVR traits and efficacy size and shape