The FDA has recently received multiple reports for two different types of adverse events associated with liquid-filled intragastric balloons used to treat obesity. The first type of adverse event involves balloon over-inflating and the second type is development of acute pancreatitis.

http://www.fda.gov/medical-devices/letters-health-care-providers/fda-alerts-health-care-providers-about-potential-risks-liquid-filled-intragastric-balloons