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What’s the function of a chest drainage bottle?

A chest drainage bottle is a medical device used to collect fluid or air drained from the pleural space (the area around the lungs) through a chest tube, acting as a sealed container that allows air and fluid to exit the chest while preventing them from re-entering, thus helping to re-expand a collapsed lung and restore normal pressure in the chest cavity; the key feature is a water-seal mechanism that acts as a one-way valve to prevent backflow.