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宫内节育环异位多数是在放置节育环时造成子宫穿孔或损伤部分宫壁,把节育环推至子宫腔外;也可因炎症、子宫收缩等因素而致环嵌顿宫壁甚至逸出宫外,造成节育环进入腹腔和盆腔者。其发生率的高低与多种因素有关,各家所报导的数字也不一。莒县自1971年以来,9年半时间共放置宫内节育环176244例,因节育环异位而住院手术的共6例(凡部分嵌顿肌层经阴道取出者未计其内),其发生率为29374例中占一例。节育环异位是节育手术的并发症之一,虽属少见,但增加了节育妇女不必要的痛
IUD most of the ectopic birth control ring is placed in the uterus caused by perforation or damage to part of the uterine wall, the birth control ring pushed to the uterine cavity; can also be due to inflammation, uterine contractions and other factors caused by ring incarcerated palace wall even escape Extrauterine, resulting in birth control ring into the abdominal cavity and pelvic. The incidence of the high and low and a variety of factors related to the figures reported by various different. Shexian County since 1971, 9 and a half years were placed 176244 cases of intrauterine contraceptive ring, a total of 6 cases of hospitalization for ectopic pregnancy caused by heterotrophic ring (where part of the incarcerated myometrial vaginal take-out were not included), the The incidence of 29,374 cases accounted for one case. Idioptric ectopic pregnancy is one of the complications of birth control surgery, although it is rare, but increase the unnecessary pain of women with birth control