In case it helps here is a little more detail on how they did the procedure.
The tank looked like a propane tank and was very cold to the touch. There was a tube out of the top with a nozzle on the end. It came out like one of those attachments you add to your garden hose to make it spray a preasurized stream. I still remember the tank icing over while the procedure was going on. I wish I knew if there was a name to this but I always just said I was going to get my face frozen. |