TYSHAK II Catheter is a non reusable, co-axial designed catheter with a balloon mounted on its distal tip. The lumen labeled with the balloon size is utilized for balloon inflation while the through lumen allows the catheter to track over a guidewire. A radiopaque band(s) defines the center (or shoulders, if two) of the dilatation balloon. Each balloon inflates to its stated diameter and length at a specific pressure. The balloon size is ± 10% at the nominal pressure. The Rated Burst Pressure (RBP) is different for each size. (See Balloon Sizing Chart on this IFU). It is important that the balloon not be inflated beyond the RBP.