Medical Carbon Dioxide USP-- A colorless, orderless, nonflammable, slightly acidic gas which is about 1 1/2 times as heavy as air. Medical Carbon Dioxide is used for various medical purposes. It can be used as an insufflation gas for minimal invasive surgery (laparoscopy, endoscopy, athroscopy) to enlarge and stabilize body cavities for better visibility of the surgical field. Also, in its liquid phase, it can be used to provide temperatures down to 76° C for cryotherapy or for local analgesia by external application onto the skin surface.