A catheter assembly comprising an elongate member (14) having a proximal end and a distal end, the distal end having at least one drainage opening (15)； a fluid containing member (20)； and a container (12) containing the elongate member and the fluid containing member； wherein the fluid containing member comprises a material which swells when exposed to a fluid and which absorbs and retains fluid in a wall between an inner diameter and an outer diameter.
