① Spontaneous delivery Transvaginal placement: Catheterization before placement, pre-estimated uterine cavity volume by B-ultrasound. The surgeon places the catheter into the uterine cavity under the guidance of ultrasound to ensure that the entire balloon is fixed above the internal cervical orifice, and then injects 250-300ml of sterile saline, the maximum can be injected into 500ml, and air or CO2 cannot be used. An external pressure pump can be connected to monitor the pressure to prevent excessive pressure, and an external volume bag can be connected to assess the amount of bleeding. Treatment is effective when a reduction or cessation of bleeding from the drainage holes of the catheter is observed. Pack a gauze roll containing antibiotics in the vagina to fix the balloon, or hang a weight of about 500g at the end of the balloon to fix the balloon.
② Cesarean section Transuterine packing: During cesarean section, the balloon catheter is inserted into the uterine cavity through the uterine incision, the balloon part is placed in the uterine cavity, and the catheter is plugged out of the vagina. While injecting sterile water, the assistant fixed the balloon in a proper position by pulling the end of the vagina, and observed that the bleeding of the catheter discharge hole was reduced, and the catheter position was fixed. The uterine incision is then routinely closed, taking care to avoid puncturing the balloon.