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近代产科学仍要求预防习惯性流产及早产。妊娠中期习惯性流产的重要原因是宫颈功能不全,现公认的疗法是子宫颈缝合术(即环扎术),但有副作用及并发症。定义由于宫颈结构或功能上的缺陷,不能维持妊娠至足月者,称为宫颈功能不全。特征是反复在孕中或晚期初排出子宫内容物,无疼痛、宫缩或流血,常有胎膜破裂或突入阴道。发病率按照各种统计占妊娠总数的0.05～1%,流产总数的0.2%,中期妊娠流产数的16～20%,有习惯性流产史者约12%,有中期妊
Modern obstetrics still requires prevention of habitual abortion and premature birth. An important cause of habitual abortion in the second trimester of pregnancy is cervical insufficiency. The accepted therapy is cervical suturing (cerclage), but with side effects and complications. Defined because of cervical structural or functional defects, can not maintain pregnancy to full-term, known as cervical insufficiency. The feature is repeated in the first trimester or late discharge of uterine contents, no pain, contractions or bleeding, often rupture of the membranes or into the vagina. Morbidity in accordance with various statistics accounted for 0.05 to 1% of the total number of pregnancies, 0.2% of the total number of abortions, 16-20% of the mid-term pregnancy abortion, there is a history of habitual abortion about 12%, with interim pregnancy