A system and method providing a catheter assembly for engaging a stenosis. The assembly includes a catheter defining a first lumen and a second lumen spaced apart and disposed about a longitudinal axis. The catheter includes an opening in communication with the first lumen to define a flow path having an angle incident to the longitudinal axis. A first marker; and a second marker disposed on the catheter are spaced equidistantly from the opening. The assembly includes a balloon having a first end and a second end each sealed about the catheter and equidistantly from the opening to define a holding volume therebetween. The opening is disposed within the holding volume thereby placing the first lumen in sealed fluid communication with the holding volume. In a preferred embodiment, the catheter assembly includes a stent disposed about the balloon, and the balloon is configured to engage the stent with a stenosis.