One end of the conduit is closed by the surgeon. The other end is brought through a small opening onto the skin on the abdomen to create the stoma. The two ureters that carry the urine from the kidneys are attached to the conduit. Now urine constantly flows from the kidneys through the ureters, through the conduit, then out of the body through the stoma and into a pouch.

Sometimes surgeons will use a piece of the large bowel, called the colon, to create the conduit. In this case, the urostomy is called a colon conduit.

The few inches of bowel the surgeon uses to make the conduit will have no effect on how your digestive system works or the type of food you can eat after your operation.

Ureterostomy
A ureterostomy is another type of urostomy. It is created when the bladder is removed ou bypassed and one or both of the ureters are redirected from the kidney and brought out directly through the abdominal wall. An opening may be placed on one side or both sides of your body. You will have a pouch for each opening.

Source: Convatec Patient Guide