a bladder prosthesis having a silicone bag with radiused lower corners and a band of anchoring fabric at the upper side , the fabric being densely looped to allow body tissue ingrowth to hold the artificial bladder in place . for entry of the urine into the bladder and emptying thereof , the bladder has in its lower part a valve communicating with a funnel - shaped conduit . the valve includes an adapter with fittings for connection to nephrostomic catheters , a valve body contained inside the adapter and having urine inlet and outlet openings and a deformable diaphragm - type elastic valve member to open and close the communication between the inside of the artificial bladder and the inside of the valve body .