Euclidean distances of laryngopharyngeal structures obtained from CT data for preclinical development of laryngoscopic devices
Purpose This study aims to determine Euclidean distances between landmark structures in the larynx and pharynx to optimize endoscope shaft designs with regard to gentle and patient-oriented handling. Methods Four Euclidean distances between landmarks in the larynx and pharynx were analyzed based on...
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Published in | Surgical and radiologic anatomy (English ed.) Vol. 42; no. 6; pp. 695 - 700 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
Paris
Springer Paris
01.06.2020
Springer Nature B.V |
Subjects | |
Online Access | Get full text |
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Summary: | Purpose
This study aims to determine Euclidean distances between landmark structures in the larynx and pharynx to optimize endoscope shaft designs with regard to gentle and patient-oriented handling.
Methods
Four Euclidean distances between landmarks in the larynx and pharynx were analyzed based on CT data of 66 patients. Distance (1): labium inferius oris—posterior pharyngeal wall at the cervical vertebra C1 (atlas), anterior edge of the tuberculum anterius atlantis. Distance (2): posterior pharyngeal wall adjacent to C1—entrance of pyriform sinus. Distance (3): inferior edge of the uvula—superior edge of the epiglottis. Distance (4): base of the vallecula—posterior pharyngeal wall. The minimum angular field of view
α
required to observe the glottis with a rigid transoral laryngoscope was derived trigonometrically from distances (2) and (4).
Results
Average Euclidean distances measured: Distance (1): 90.7 mm ± 6.9 mm in men and 86.9 mm ± 5.9 mm in women. (2): 73.7 mm ± 13.4 mm and 56.2 mm ± 7.6 mm. (3): 25.2 mm ± 8.6 mm and 18.5 mm ± 6.8 mm. (4): 20.8 mm ± 4.6 mm and 16.5 mm ± 3.4 mm.
α
: 16.0° ± 3.9° and 16.6 ± 4.3°.
Conclusions
As expected, statistically significant sex-related differences could be observed for distances (1)–(4). The results indicate that the length of transoral laryngoscopes should not be below 110 mm and that a minimum angular field of view of
α
= 17° is required to fully observe the laryngeal inlet. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0930-1038 1279-8517 |
DOI: | 10.1007/s00276-019-02397-3 |