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Is it convenient to talk at the moment? topamax cost australia During a stent procedure, a small mesh tube is inserted in the blocked artery through the use of a catheter.  Once inside, a balloon located within the stent expands, smashing the plaque against the walls of the artery and clearing out the blockage.  The stent then remains in the blood vessel and acts somewhat like scaffolding, keeping the artery open and restoring blood flow.