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1.术前准备查血常规、尿常规正常;B超进一步证实妊娠在12至16周及胎盘定位。 2.宫颈插管排空膀胱后以截石位于手术台,常规消毒辅巾暴露宫颈并消毒,宫颈管内插入18号无菌尿管,深度在6～8cm左右,用一块无菌纱布包绕留在宫颈外的尿管并置入阴道内。插管深度要适宜,超过宫颈内口,过深容易刺破胎盘或胎膜,引起流血、流水,增加出血量及术后感染病率;过浅,若不经过宫颈内口,起不到充分扩张宫
1. preoperative blood routine examination, routine urine; B ultrasound further confirmed pregnancy at 12 to 16 weeks and placenta localization. 2. Cervical catheter emptying the bladder to the stone in the operating table, conventional disinfection towel exposed cervix and disinfection, cervical canal insertion of sterile catheter 18, the depth of about 6 ~ 8cm, wrapped with a sterile gauze wrap The catheter outside the cervix and placed in the vagina. Intubation depth should be appropriate, more than the mouth of the cervix, too easy to puncture the placenta or fetal membranes, causing bleeding, running water, increase the amount of bleeding and postoperative infection rate; too shallow, if not through the mouth of the cervix, not fully Expansion of the palace