A catheter includes an inflation balloon and at least one electrode. The inflation balloon is inflatable within a vessel. The at least one electrode extends around at least a portion of a periphery of the inflation balloon. The at least one electrode is expandable as the inflation balloon is inflated, and contracts as the inflation balloon is deflated. The at least one electrode is held in place along a length of the inflation balloon with a tether member, which is secured at opposing distal and proximal ends of the inflation balloon.
