Ever thought about breathing liquid? It is a treatment sometimes used for premature infants whose lungs are not fully developed, or to deliver medication directly to alveoli. It was also seen in science fiction (the movie The Abyss). Liquid Ventilation, a December 1999 pediatric medical review. "But the perfluorocarbon for medical use is not available on the market. As premature babies need very small quantities and no commercial application for adults has been found, the patent-owning company has opted not to market it arguing that it lacks profitability."
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