[Ureteral intussusception - a practicable anti-reflux method].

A valve in distal direction was formed by means of invaginationion without opening the urinary tract in 15 undilated ureters in dog. After 3 months their function as an antireflux valve was checked. The result was good in 9 cases, a stenosis of the invaginat appeared in 4 cases and no antireflux effect was existing owing to the dislocation of the invagination in 2 cases. Details of the operative technique, causes of the failure, and the employment of the method in the human medicine were discussed.