This is the relevant section of the article that spawned this question:
The iron lung that she used was a cylindrical chamber with a seal at the neck. She lay on her back in the device with only her head exposed, and made eye contact with visitors using an angled mirror above her head. The lung worked by producing positive and negative pressure on the lungs that caused them to expand and contract so that she could breathe.
In other words, the article implies that the iron lung was sealed and that the only part of her body that was exposed was her head. If it was sealed, how could they have changed her diaper? How could they have taken her out in order to bathe her--and to sanitize the iron lung? Wouldn't she have stopped breathing?
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