Work On The Iron Lung
Emerson's father, then Health Commissioner of New York City, encouraged him to work on an artificial respirator after noticing the beginning of a polio epidemic. Emerson thus began his work on the iron lung in the early 1930s, improving the design of the Drinker lung. Completed in July 1931, Emerson's lung was quieter, lighter, more efficient, and cheaper; with a $1000 price tag, it sold for less than half the price of Drinker's make. Drinker threatened legal action against Emerson, and later filed a lawsuit which backfired; Drinker not only lost the suit, his patents were declared invalid.
Emerson's new design replaced blowers and valves with a flexible diaphragm in a dual layer. This acted as a failsafe: if one layer was torn, the second would continue operation. He also made improvements to the chamber. The first example of this design, nicknamed "Old Number One", is currently on display at the Smithsonian Institution in Washington, DC. Emerson continued to make improvements to the iron lung, adding a quick opening and closing function, an improved pressure gauge, and emergency hand operation. His final improvement was the addition of a transparent positive pressure dome, allowing ventilation when the chamber was opened to care for the patient.
Read more about this topic: John Haven Emerson
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