A system for treating occlusions present within a body vessel. The device comprises a plaque-treating device having an elongate shaft and a distal plaque-treating portion adapted to remove hardened plaque from within a body vessel. The device further comprises a multi-balloon positioning catheter with a lumen into and through which lumen the plaque-treating device may be extended, the positioning catheter having at least three inflatable balloons positioned circumferentially about the lumen to controllably stabilize the lumen and its distal opening at a desired location within the body vessel, thus controlling the location of the plaque-treating device when extended from the distal end of the positioning catheters lumen.
