A catheter having a tubular body and a rotatable shaft disposed within a lumenof thetubular body. A cutting element is coupled to the rotatable shaft, the cuttingelement having acutting edge, the cutting element and rotatable shaft being longitudinallymoveable within thetubular body between a stored position in which the cutting element isparallel a longitudinal axisof the tubular body and a cutting position in which the cutting element isdeflected between theproximal and distal ends of the tubular body to extend beyond an outerdiameter of the tubularbody. The cutting element is configured to cut material from the wall of avessel at a treatmentsite as the catheter is pushed distally through the treatment site. Thecatheter includes acollection chamber positioned proximally of the cutting window.
