12.1. The construction of an ileal conduit urinary diversion involves a major intra-abdominal surgical procedure. A segment of ileum is isolated, along with its blood supply, and intestinal continuity is restored by means of an ileo-ileal anastomosis.he proximal ends, carrying urine from the kidneys, are anastomosed to the proximal end of the ileal segment (which forms the ileal conduit) and the distal end of the conduit is brought through the abdominal wall, creating a stoma (urostomy). An ileal conduit leaves the bladder defunctioned.