An apparatus is for performing a medical procedure using an inflation fluid. The apparatus comprises a catheter (10) including an inflatable balloon (12) mounted adjacent to a catheter shaft in the form of a tube (14) with an inflation lumen (16) forming a conduit for supplying an inflation fluid to the balloon via two distinct lumens (16a,16b). The balloon has an interior capable of being inflated by the inflation fluid transmitted through the inflation lumens of the shaft. The tubes defining the inflation lumens provide two outlets for transmitting different flows of the inflation fluid to the interior of the balloon. A stent is also disclosed.