A balloon catheter assembly, comprising: an elongated member comprising: a first lumen extending longitudinally through the elongated member, the first lumen in communication with a first proximal port; a second lumen extending longitudinally through the elongated member; and a third lumen extending longitudinally through the elongated member; a junction hub disposed at the proximal end of the elongated member; a first extension member comprising a lumen in fluid communication with the first lumen via the junction hub; and a second extension member comprising a lumen in fluid communication with the second and third lumens via the junction hub; and a balloon segment comprising: an inflation balloon coupled to the elongated member such that an interior portion of the inflation balloon is in fluid communication with the second lumen and the third lumen but is not in fluid communication with the first lumen; a tubular shaft extending through the inflation balloon, wherein the tubular shaft is aligned with and coupled to the first lumen, the tubular shaft configured such that a guide wire is extendable from the first lumen of the elongated member to the tubular shaft and through the inflation balloon; characterized in that said second and third lumina extend from a proximal end of the elongated member to a distal end of the elongated member and a reinforcement member is coupled to a portion of the tubular shaft wherein the reinforcement member is constrained to the balloon segment. an elongated member comprising: a first lumen extending longitudinally through the elongated member, the first lumen in communication with a first proximal port; a second lumen extending longitudinally through the elongated member; and a third lumen extending longitudinally through the elongated member; a junction hub disposed at the proximal end of the elongated member; a first extension member comprising a lumen in fluid communication with the first lumen via the junction hub; and a second extension member comprising a lumen in fluid communication with the second and third lumens via the junction hub; and a first lumen extending longitudinally through the elongated member, the first lumen in communication with a first proximal port; a second lumen extending longitudinally through the elongated member; and a third lumen extending longitudinally through the elongated member; a junction hub disposed at the proximal end of the elongated member; a first extension member comprising a lumen in fluid communication with the first lumen via the junction hub; and a second extension member comprising a lumen in fluid communication with the second and third lumens via the junction hub; and a balloon segment comprising: an inflation balloon coupled to the elongated member such that an interior portion of the inflation balloon is in fluid communication with the second lumen and the third lumen but is not in fluid communication with the first lumen; a tubular shaft extending through the inflation balloon, wherein the tubular shaft is aligned with and coupled to the first lumen, the tubular shaft configured such that a guide wire is extendable from the first lumen of the elongated member to the tubular shaft and through the inflation balloon; characterized in that said second and third lumina extend from a proximal end of the elongated member to a distal end of the elongated member and a reinforcement member is coupled to a portion of the tubular shaft wherein the reinforcement member is constrained to the balloon segment. an inflation balloon coupled to the elongated member such that an interior portion of the inflation balloon is in fluid communication with the second lumen and the third lumen but is not in fluid communication with the first lumen; a tubular shaft extending through the inflation balloon, wherein the tubular shaft is aligned with and coupled to the first lumen, the tubular shaft configured such that a guide wire is extendable from the first lumen of the elongated member to the tubular shaft and through the inflation balloon; characterized in that said second and third lumina extend from a proximal end of the elongated member to a distal end of the elongated member and a reinforcement member is coupled to a portion of the tubular shaft wherein the reinforcement member is constrained to the balloon segment.