a method of making a radially expandable fluid delivery device includes providing a tube of biocompatible fluoropolymer material with a predetermined porosity based on an extrusion and expansion forming process , applying a radial expansion force to the tube expanding the tube to a predetermined diameter dimension , and removing the radial expansion force . the tube is radially inelastic while sufficiently pliable to be collapsible and inflatable from a collapsed configuration to an expanded configuration upon introduction of an inflation force , such that the expanded configuration occurs upon inflation to the predetermined diameter dimension . the fluid delivery device is constructed of a microporous , biocompatible fluoropolymer material having a microstructure that can provide a controlled , uniform , low - velocity fluid distribution through the walls of the fluid delivery device to effectively deliver fluid to the treatment site without damaging tissue proximate the walls of the device .