以往临床使用的取环器没有客观工作指标,操作时具有较大的盲目性、局限性、危险性以及失败的可能性,且技术上的经验依赖性也很大。尤其在某些特殊病例有时会遇到较大困难,轻者损伤子宫壁,严重者造成子宫穿孔、大出血,甚至误伤肠管引起感染、败血症等严重合并症,在一定程度上给计划生育工作带来不良影响。为了克服上述缺点, In the past, the cyclone used in clinical practice did not have an objective working index, and its operation had greater blindness, limitation, danger and possibility of failure, and the technical experience was also greatly dependent on it. Especially in some special cases sometimes encounter greater difficulties, the light damage to the uterine wall, severe cases of uterine perforation, bleeding, or even injury caused by bowel infection, sepsis and other serious complications, to a certain extent, bring family planning work Adverse effect In order to overcome the above shortcomings,