Catheter balloon mold form and molding process

A mold for a medical device balloon, the mold having a cavity adapted to receive a hollow parison expandable therein to form the balloon, the cavity having a length, a first end, a second end, and a cavity wall with inner and outer surfaces, wherein the cavity wall is provided with a plurality of through-holes along at least a portion of the length thereof to facilitate entrance and egress of a heated fluid, at least one through-hole having first dimension of between about 0.1 mm to about 1.5 mm, wherein the through-holes are formed as longitudinally oriented slots, wherein the slots are arranged in a plurality of circumferentially spaced columns, wherein the slots of circumferentially alternating columns of slots are staggered longitudinally.