The man in the iron lung: How Paul Alexander lived life to the full – GWC Mag

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The iron lung uses a negative pressure system. Powered by a motor, its bellows suck air out of the cylinder, creating a vacuum around the patient’s body and forcing the lungs to expand and take in air. When the air is let back in, the same process in reverse makes the lungs deflate. The device needs a source of energy to function.

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