Figure 2From: The use of balloons for uterine cervical ripening is associated with an increased risk of umbilical cord prolapse: population based questionnaire survey in Japan Balloons for cervical ripening: (a) Intra-cervix balloon (usually filled with 40Â ml of water and inserted into the uterine cervix), (b) Disk-type balloon (usually filled with 100Â ml of water and placed into the uterine isthmus), (c) Ball-type balloon (usually filled with more than 100Â ml of water and placed in the uterine isthmus). Back to article page