A segment of small intestine (ileum) used to convey urine from the ureters to an appliance outside the body. The ureters are implanted into an isolated segment of bowel, usually ileum but sometimes sigmoid colon, one end of which is brought through the abdominal wall to the skin surface. This end forms a spout, or stoma, which projects into a suitable urinary appliance. The ureters themselves cannot be used for this purpose as they tend to narrow and retract if brought through the skin. The operation is performed if the bladder has to be removed or bypassed; for example, because of cancer.
A method of diverting the urinary flow by transplanting the ureters into a prepared and isolated segment of the ileum, which is sutured closed on one end. The other end is connected to an opening in the abdominal wall. Urine is collected there in a special receptacle.
The surgeon employs a portion of the ileum, the final segment of the small intestine, to create a substitute channel for urine outflow when the bladder has been removed.