A cryogenic catheter includes an outer flexible member having at least one cryogenic fluid path through the flexible member. These transformations can be any transformation capable of being applied in graduated increments and having a corresponding incremental visual influence on the printed output. The cover structure has an air inlet valve and a slide switch, which, when properly set, allow air to be sucked into or expelled out of the container by the manual operation of the piston to increase or decrease the internal pressure of the container for oil suction and oil drainage. 001% to 2% by weight of an antioxidant.