子宫内口松弛症孕期胎胞突出宫颈外口或至阴道内,施行宫颈缝合术很困难,强行还纳也易造成胎膜破裂。为此作者先经腹抽吸羊水,减低宫内压,促使胎胞便于还纳,再按McDonald法缝扎宫颈,取得良好结果。术前须绝对卧床,抬高床尾30°,静滴β-肾上腺素能受体兴奋剂(苯氧丙酚胺或羟苄羟麻黄硷)抑制宫缩,并预防感染。手术在硬膜外或腰椎麻醉下,适当抬高臀部,继续静滴宫缩抑制剂,使子宫弛缓。借助超声在下腹部选择最佳穿刺点,并最好使用插管穿刺针,避免损伤胎盘和胎儿。如胎盘附着于子宫前壁,可经宫底部穿刺。根据妊娠周及胎胞回缩程度抽吸羊 Intrauterine relaxation syndrome during pregnancy fetal cell prominent outside the mouth or to the vagina, the implementation of cervical suture is very difficult, forcibly also easily cause the rupture of membranes. To this end, the author first by abdominal pumping of amniotic fluid, reducing intrauterine pressure, to facilitate the delivery of fetal cells, then press McDonald method of cervical suture, and achieved good results. Preoperative absolute bed rest, raise the bed end 30 °, intravenous β-adrenergic receptor agonist (phenpropiophenamine or hydroxybenzyl amine ephedrine) inhibit contractions and prevent infection. Surgery under epidural or lumbar anesthesia, appropriately raise the buttocks, continue intravenous tocolytic agents, so that uterine relaxation. Ultrasound in the lower abdomen choose the best puncture point, and the best use of intubation puncture needle, to avoid damage to the placenta and fetus. Such as the placenta attached to the anterior wall of the uterus, piercing the bottom of the palace. According to the gestational weeks and fetal retraction degree of suction sheep