Abstract: A drug delivery catheter which may be inserted into a vessel, such as a blood vessel is disclosed. The drug delivery catheter comprises any elongated tubular member which has a proximal end and a distal end. A drug lumen which provides a communication path for fluid is provided in the elongated tubular member for delivering a fluid, such as the drug to be administered. An inflatable balloon assembly is provided at the distal end of the elongated tubular member. The balloon assembly includes apertures which communicate with the drug lumen. The balloon assembly comprises a tubular balloon which is helically wound through the elongated tubular member and a sheath.