Balloon catheter with enhanced locatability

A balloon catheter for insertion in a vessel for treating a treatment area, comprising:

• a shaft;
• an inflatable balloon attached to the shaft and having an interior;
• and
• at least three radiopaque markings located on the shaft and spaced along a longitudinal axis of the catheter in the interior of the balloon,
• wherein a first distance separating a first radiopaque marking from a second adjacent radiopaque marking is different from a second distance separating the second radiopaque marking from a third adjacent radiopaque marking,
• characterized in that the balloon includes an uninflated midpoint location (A) and an inflated midpoint location (B) of the working surface (W) of the balloon on of the three radiopaque markings is positioned at an offset location (O) relative to the uninflated midpoint location 9A),
• whereby on inflation of the balloon, the one radiopaque marking substantially aligns with the inflated midpoint location (B).