Abstract: A connector connects a silicone or other radially expandable catheter to a catheter that does not expand radially. The catheter includes a hollow first connection part, a hollow second connecting part and a locking sleeve. The hollow second connecting part is threadably connected to the first connection part. The second part has a rib protruding from an external surface thereof. The rib has a recessed notch. A locking sleeve has a lip projecting radially inwardly therefrom at each end. The lip at the second end is fixedly received within the recessed notch. The lip at the first end is disposed about the external surface of the connection part. The locking sleeve is axially movable with respect to the first connection part. Axial movement of the locking sleeve in one direction is limited, thereby preventing disassembly of the first connecting part and the second connecting part.