The surgical technique for a new alternative to urinary diversion is described. The biocarbon conduit is an inert device implanted in the abdominal wall. Its inner end is anastomosed to the distal ureter, and the outlet is over the abdominal skin and connected to a collector tube into a urinary bag. Twenty implants were performed between March, 1980, and July, 1981. Seventeen patients had carcinoma of the uterine cervix, and 3 had carcinoma of the urinary bladder (age range 34 to 79 years). All had severe urinary tract infection, retrodilation, and were in poor general physical condition. Eight fistulas developed in the 20 implants. © 1984.