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The apparatus consists essentially of an inhaler with inflated mouthpiece, to which a heavy rubber bulb is attached. Air and oxygen are forced into the lungs when the bulb is compressed, and withdrawn by suction when the bulb is released.
This apparatus is very simple; there are no valves or complications to get out of order. The valve in the instrument is simply a small hole. When air or oxygen is being forced into the lungs, the finger is placed over the hole and held there until the air is drawn out; then the finger is removed, and the bulb compressed and released, drawing into the bulb a fresh supply of air or oxygen. Then the finger is replaced over the hole, and the air is forced into the lungs and then withdrawn by the suction of the bulb.
The bulb contains the proper amount of air for an adult;
Dudley FC. ARTIFICIAL RESPIRATOR. JAMA. 1918;70(1):21. doi:https://doi.org/10.1001/jama.1918.26010010002009b
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