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Liquid breathing is a form of respiration in which a normally air-breathing organism breathes an oxygen-rich liquid which is capable of CO 2 gas exchange (such as a perfluorocarbon). [ 1 ] The liquid involved requires certain physical properties, such as respiratory gas solubility, density, viscosity, vapor pressure and lipid solubility, which ...
The science-fiction film The Abyss (1989) depicted an experimental liquid-breathing system, in which the use of highly oxygenated Fluorinert enabled a diver to descend to great depths. While several rats were shown actually breathing Fluorinert, scenes depicting actor Ed Harris using the fluid-breathing apparatus were simulated. [6]
Three different approaches sought to utilize this characteristic to improve oxygen delivery to tissue. Early perfluorocarbon emulsions for oxygen delivery were developed as blood substitutes. They used large-molecule perfluorocarbons with boiling points higher than body temperature which were formed into liquid emulsion droplets.
Perfluoroalkanes are very stable because of the strength of the carbon–fluorine bond, one of the strongest in organic chemistry. [4] Its strength is a result of the electronegativity of fluorine imparting partial ionic character through partial charges on the carbon and fluorine atoms, which shorten and strengthen the bond (compared to carbon-hydrogen bonds) through favorable covalent ...
The liquid ventilator removes Carbon dioxide (CO 2) from the PFC by saturating it with oxygen (O 2) and medical air. This procedure can be performed with either a membrane oxygenator (a technology used in extracorporeal oxygenators) or a bubble oxygenator. [13] The liquid ventilator heats the PFC to body temperature.
Most applications utilize its ability to dissolve large amounts of oxygen (100 mL of perfluorodecalin at 25 °C can dissolve 49 mL of oxygen at STP [2]). Perfluorodecalin was an ingredient in Fluosol, an artificial blood product developed by Green Cross Corporation in the 1980s. It is also being studied for use in liquid breathing.
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