The PTS Sizing Balloon Catheter is a coaxial design catheter with a balloon mounted on its distal tip. The lumen labeled with the balloon size is for balloon inflation while the through lumen allows the catheter to track over a guidewire. This lumen has two radiopaque platinum marker bands under the balloon shoulders and there are two additional radiopaque platinum marker bands spaced at 10 mm (as measured from leading edge to leading edge). These bands are located at the balloon center and are used as a distance reference. Each balloon inflates to the stated diameter and length at a specific pressure. The balloon size is ± 10% at the Rated Burst Pressure (RBP). The RBP is different for each size. Check the package label for the RBP. It is important that the balloon not be inflated beyond RBP.