A continent ileal bladder was constructed in 6 dogs. The most important requirements for a continent ileal bladder as a reliable mechanism of continency and for prevention of back flow in the ureters was achieved by 2 intussusception valves (nipples) of small bowel in opposite directions. The dynamics of these nipple valves were studied electromanometrically and radiologically. These intussusception valves did not hinder a free flow in the isoperistaltic direction and did prevent reflux in the antiperistaltic direction.