“…The previous methods are; transplantation of both the ureteral orifices to the abdomen [1], exteriorization of the vesical trigone [2], hemisection of the bladder [3,4], and cutaneous ureteros tomy [5,6]. They were, however, not always satisfactory for a long-term experiment because of their limited pa tency for only a short period, unphysiological catheteriza tion into the ureters, and/or an immense incontinence from both renal units resulting in a severe dermatitis and general weakness of the animals.…”