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This instrument enables a patient whose larynx has been removed because of carcinoma to speak with a voice approaching the normal in volume and quality. A neck piece is held in place by means of the collar, to which it is attached by an ordinary collar button. A rubber tube connects the neck piece with the trumpet, and a tube from the trumpet conducts the sound into the mouth. To speak, the neck piece is pressed gently against the neck, and air is blown through the trumpet, setting up a sound resembling the normal voice. This sound is conducted into the mouth, where it is formed into words. Some training and practice are required to produce the consonants, while the vowels are easily elicited at once. Practice is required to obtain inflection.
The general idea is old, but this instrument embodies several new principles which have resulted in a more
McKesson EI. A MECHANICAL LARYNX. JAMA. 1927;88(9):645-646. doi:10.1001/jama.1927.92680350028011b