On the evening of May 23, 1888, I was one of several hundred who listened to Joseph O'Dwyer, in the Hall of the College of Physicians, Philadelphia, in a lecture before the Philadelphia County Medical Society. In the proceedings of the society I find the following note:
"Before reading his paper, Dr. O'Dwyer exhibited tubes with a metallic attachment to replace the epiglottis in swallowing, one of them being so arranged with a spring that the finger might be introduced behind it, as an extractor. In order to illustrate through how small a space [the italics are mine] breathing can occur, he exhibited a specimen from a case in which there had been no choking of voice or other sign of laryngeal involvement. Many fear that the tube will slip through the trachea. A tube was exhibited in situ in a 3-year-old larynx, showing that this accident can not occur
ROSENTHAL E. PROLONGED INTUBATION. JAMA. 1902;XXXVIII(12):750–755. doi:10.1001/jama.1902.62480120008001a
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