A curved-wing balloon is provided herein. A medical device embodying the invention may include an expandable balloon and an inner shaft positioned within the expandable balloon wherein the expandable balloon may be coupled to an inflation lumen, expandable from a first position to a second position, and having non-parallel sides when initially formed. A method employing the present invention may include placing an expandable medical balloon between a first forming blade and a second forming blade of a cam-former jaw system, moving the first forming blade from a first open position to a second closed position and moving the second forming blade from a first open position to a second closed position, the first forming blade having a first forming member, the second forming blade having a second forming member, the first forming member and the second forming member being in contact with the expandable balloon when in the second closed position, a mating surface of the first forming member being non-parallel to a mating surface of the second forming member when in contact with the balloon.