Study of tracheal collapsibility, compliance and stress by considering its asymmetric geometry

Teng, Z., Ochoa, I., Li, Z., & Doblare, M. (2009) Study of tracheal collapsibility, compliance and stress by considering its asymmetric geometry. Medical Engineering and Physics, 31(3), pp. 328-336.

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Abstract

The shape of tracheal cartilage has been widely treated as symmetric in analytical and numerical models. However, according to both histological images and in vivo medical image, tracheal cartilage is of highly asymmetric shape. Taking the cartilage as symmetric structure will induce bias in calculation of the collapse behavior, as well as compliance and muscular stress. However, this has been rarely discussed. In this paper, tracheal collapse is represented by considering its asymmetric shape. For comparison, the symmetric shape, which is reconstructed by half of the cartilage, is also presented. A comparison of cross-sectional area, compliance of airway and stress in the muscular membrane, determined by asymmetric shape and symmetric shape is made. The result indicates that the symmetric assumption brings a small error, around 5% in predicting the cross-sectional area under loading conditions. The relative error of compliance is more than 10%. Particularly when the pressure is close to zero, the error could be more than 50%. The model considering the symmetric shape results in a significant difference in predicting stress in muscular membrane by either under- or over-estimating it. In conclusion, tracheal cartilage should not be treated as a symmetric structure. The results obtained in this study are helpful in evaluating the error induced by the assumption in geometry.

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6 citations in Web of Science®

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ID Code: 90327
Item Type: Journal Article
Refereed: Yes
Keywords: Asymmetric, Cartilage, Collapse, Compliance, Stress, Trachea
DOI: 10.1016/j.medengphy.2008.06.006
ISSN: 1873-4030
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > Institutes > Institute of Health and Biomedical Innovation
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2009 [please consult author]
Deposited On: 16 Nov 2015 05:01
Last Modified: 11 Dec 2015 03:18

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