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Balloons for cervical ripening: (a) Intra-cervix balloon (usually filled with 40 ml of water and inserted into the uterine cervix), (b) Disk-type balloon (usually filled with 100 ml of water and placed into the uterine isthmus), (c) Ball-type balloon (usually filled with more than 100 ml of water and placed in the uterine isthmus).
