Fortune Foley Catheter 2-Way Balloon 5 ml PRIM Size Ch12 is a medical device used to drain the urinary bladder. It is designed to remain in the bladder for an extended period of time. The catheter consists of a flexible silicone tube with a balloon at one end and an outlet at the other end for connection to a urine drainage system. The balloon is inflated with water or air after the catheter is inserted into the bladder and this prevents the catheter from slipping out of the bladder.