The crossword puzzle clue today is "Old-fashioned respirator". To solve this puzzle clue, we look for the similarity crossword puzzle definitions for our clue. Below are the possibilities crossword solution and answer for "Old-fashioned respirator". Good luck! :).

 IRON LUNG
The Iron Lung was invented to treat coal gas poisoning, but was most famously used as a life-support system for polio victims in the mid-1950s. We humans are “negative pressure” breathers, meaning that air is drawn into the body by the ribs expanding and the diaphragm drawing downwards. The pressure inside the chest cavity become lower as a result of the increased space, and the lungs fill with air to equalize that pressure with the atmosphere. The chest cavity then contracts to expel exhausted air from the lungs. A patient in an iron lung lies on a bed surrounded by a sealed chamber, with just the head and neck protruding. As the patient cannot breathe for himself or herself, pumps reduce the pressure surrounding the patient cause the chest cavity to expand, and pull in air through the mouth and nose. The chamber pressure is then increased, causing the chest cavity to collapse, and air is expelled.

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