Canine pericardium was known to be composed of primarily collagen, elastin, and matrix. Therefore, collagen membrane was used to reconstruct the urinary tract. The upper half of the urinary bladder in the rabbits was replaced with this membrane. The membrane disappeared within one month and regeneration of the bladder tissues was observed. Intra-venous pyelography and pathological examination revealed the complete regeneration of the urinary bladder tissues. Stone formation, urinary leakage, infection and local calcification were not demonstrated.
