Abstract: A catheter for uses in an angioplasty system comprising a tubular body with a proximal end, a distal end and a distal end portion and having a plurality of holes in and along opposite sides of the distal end portion. Each hole has an elongate shape and a center and the centers of the holes are located on an imaginary line parallel to the longitudinal axis of the catheter. Each elongate hole is inclined not less than 30 degrees and not more than 60 degrees to the imaginary line and each elongate hole on one side of the catheter is inclined upwardly or downwardly of the imaginary line and each opposite side hole on the other side of the catheter is inclined upwardly or downwardly relative to the imaginary line so that opposed holes form an X.