Patent ID: 7306617

Claim:
A catheter for insertion into a lumen to treat a patient, the catheter comprising: an elongated catheter body having a proximal end and a distal end, an outer dimension and an inner dimension; and at least one spiral centering arm attached near the distal end of the catheter, the spiral centering arm having and extending between a proximal end and a distal end, the spiral centering arm having a smaller first size for insertion into a lumen; a larger second size for expanding to substantially equal the size of the lumen, and to center the catheter in the lumen; and a plurality of intermediate sizes there between; the spiral centering arm tending to resiliently expand from a smaller size to a larger size, wherein the centering arm extends in a spiral around a longitudinal axis of the catheter in a spiral pattern between the centering arm proximal and distal ends; the spiral centering arm is made from Nickel-Titanium alloy.