a sterilization process that preserves the mechanical properties of dilatation balloons and balloon catheters manufactured from polymers susceptible to the degradation reactions induced by ionizing radiation . the advantages of the sterilization process contemplated by this invention results from a reduced oxygen environment during sterilization , thereby preventing the degeneration process initiated in polymers during irradiation . additionally , a balloon or balloon dilatation catheter sterilized by the process of the invention is provided .