The disclosure provides plaque treatment catheter assemblies for the treatment of arterial plaques and removal of clots. One assembly includes a second catheter tube movable within a first catheter tube and an expansion member movable within the second tube. The second catheter tube has one or more distally disposed and outwardly expandable plaque treatment portion(s). Another assembly includes a catheter tube and at least one channel(s) within the catheter. The channel includes an elongate member with a distally disposed plaque scoring or clot retrieval member. Optionally the assembly includes an expandable member that can cause movement of the scoring member.
