There are many surgical techniques for urinary diversion surgery. They fall into two categories: continent diversion and conduit diversion. In continent diversion, also known as continent catheterizable stomal reservoir, a separate rectal reservoir for urine is created, which allows evacuation from the body. In conduit diversion, or orthotopic urethral anastomotic procedure, an intestinal stoma or conduit for release of urine is created in the abdominal wall so that a catheter or ostomy can be attached for the release of urine. An ileal conduit is a small urine reservoir that is surgically created from a small segment of bowel. Both techniques are forms of reconstructive surgery to replace the bladder or bypass obstructions or disease in the bladder so that urine can pass out of the body. Both procedures have been used for years and should be considered for all appropriate patients. Ileal conduit surgery, the easiest of the reconstructive surgeries, is the gold standard by which other surgical techniques, both continent and conduit, have been compared as the techniques have advanced over the decades.

From http://www.healthline.com/galecontent/ileal-conduit-surgery