1968年国外开始用聚硅管制成环状内放甲孕酮200mg在月经第五天放入阴道内,通过粘膜吸收药物,达到避孕作用。1972年上海医用橡胶研究所,从医用硅橡胶制成含甲地孕酮的阴道避孕环,78年开始逐步扩大使用,我院自82年12月开始在门诊使用共计310人次,放置一年以上100例分析如下: In 1968, the polysilicon tube was used abroad to make 200mg of medroxyprogesterone acetate in the vagina, which was absorbed into the vagina by the fifth day of the menstrual cycle and absorbed by the mucosa to achieve the contraceptive effect. 1972 Shanghai Institute of Medical Rubber, made of medical silicone rubber containing megesterone vaginal ring, 78 years began to gradually expand the use of our hospital since December 82 in the clinic for a total of 310 passengers, for more than a year 100 cases analyzed as follows: