节育环异位是指节育环嵌顿于子宫肌层或穿透子宫壁进入腹腔、阔韧带者.发生原因节育环异位可能与下列因素有关:一、术者责任心不强或技术水平低,未能掌握子宫位置、大小,以致放环时方向错误或用力过猛,将环嵌入宫壁,甚至送入腹腔.二、哺乳期或多产妇的子宫,肌层组织薄弱,易于损伤或穿孔.据统计,在环异位病例中,哺乳期放环约占50%左右,而胎次以三胎以上为多见.三、人工流产或上环时损伤子宫壁,术后由于子宫收缩,环由损伤部位逐渐挤入肌层,甚至进入腹腔.四、绝经后子宫萎缩,使环嵌入宫壁.据上海报导,环异位中绝经者占20%左右五、节育环发生变形、断裂,则易出 Idioptric ring refers to the birth control ring incarcerated in the myometrium or through the uterine wall into the abdominal cavity, broad ligament who cause Occipital ectopic may be related to the following factors: First, the operator is not strong sense of responsibility or skill level , Failed to grasp the position and size of the uterus so that the direction of the ring when put wrong or too much force, the ring embedded in the uterine wall, or even into the abdominal cavity .2, lactation or maternal uterus, muscular tissue is weak, easy to damage or perforation According to statistics, in the case of heterotrophic ring, lactation put ring about 50%, while the parity to more than three babies is more common.Third, artificial abortion or injury when the uterine wall, due to uterine contractions after surgery, Ring by the site of injury gradually squeezed into the muscle, and even into the abdominal cavity .In four, the postmenopausal uterine atrophy, the ring embedded in the uterine wall.According to Shanghai reported that the ring ectopic menopause accounted for about 20% five, birth control ring deformation, fracture, It is easy to go out