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. 2017 Jun 26;4:81. doi: 10.3389/fmed.2017.00081

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Copyright © 2017 Lorenz.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Gussenbauers and Billroths internal artificial larynx. (a) Tracheal cannula, (b) pharyngeal cannula, (c) phonation cannula, (d) turnable sealing, (e) window to trachea, (h) artificial epiglottis, and (i) spring.