Provided is a catheter system for intraluminal passages, including blood vessels, which includes a guidewire incorporating a work element, and an inflatable balloon enveloping the work element. The work element includes a lesion-smoothing member which in a work configuration projects radially from a longitudinal axis of the balloon. The work element may be configured to allow for controllable rotation about the longitudinal axis, such that the rotation thereby substantially defines a closed ellipsoid-like surface. When the balloon is inflated with a fluid and is inside an intraluminal passage, rotation of the work element causes the lesion-smoothing member to rotate along a surface of the balloon and simultaneously push against the balloon surface. The pushing against the balloon surface exerts force against the walls of the intraluminal passage, thereby allowing for smoothing lesion material located on the walls of the intraluminal passage.
