A catheter includes an outer tubular body, a spiral member, and a disruptor. The outer tubular body defines a longitudinal axis and extends to a distal annular cutting edge. The outer tubular body defines a lumen having distal and proximal ends. The spiral member is supported within the outer tubular body and includes proximal and distal ends. The distal end of the spiral member is positionable distally beyond the cutting edge of the outer tubular body. The disruptor is supported within the outer tubular body proximally of the cutting edge of the outer tubular body.
