Judy, an iliostomy is where the ilium part of the colon is used to divert the bowel contents to the outside. Given and iliostomy and a colostmy I would rather have the colostomy. You are thinking of a urostomy. It diverts the ureters to the outside. And if you don't have a good seal between the belly and the bag it can be a pretty big problem. I am trying to think of the stuff we used to put on our babies for diaper rashes. White and sticky stuff. Something to do with zinc. It might act as a good barrier for the skin against the urine. And yes, suprapubic catheter was the type of catheter I was talking about. A lot of my paralyzed, permanent use catheter patients had one.