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Technical Briefs

A Three-Dimensional Human Trunk Model for the Analysis of Respiratory Mechanics

[+] Author and Article Information
Michel Behr

LBA, Faculté de Medecine Nord, UMRT24, INRETS/Université de la Méditerranée, Boulevard Pierre Dramard, Marseille F-13916, Francemichel.behr@inrets.fr

Jeremie Pérès, Maxime Llari, Yves Godio, Christian Brunet

LBA, Faculté de Medecine Nord, UMRT24, INRETS/Université de la Méditerranée, Boulevard Pierre Dramard, Marseille F-13916, France

Yves Jammes

Faculté de Médecine Nord, UMR MD2 P2COE, IFR Jean Roche/Université de la Méditerranée, Boulevard Pierre Dramard, Marseille F-13916, France

J Biomech Eng 132(1), 014501 (Dec 08, 2009) (4 pages) doi:10.1115/1.4000308 History: Received April 01, 2009; Revised September 21, 2009; Posted September 28, 2009; Published December 08, 2009; Online December 08, 2009

Over the past decade, road safety research and impact biomechanics have strongly stimulated the development of anatomical human numerical models using the finite element (FE) approach. The good accuracy of these models, in terms of geometric definition and mechanical response, should now find new areas of application. We focus here on the use of such a model to investigate its potential when studying respiratory mechanics. The human body FE model used in this study was derived from the RADIOSS ® HUMOS model. Modifications first concerned the integration and interfacing of a user-controlled respiratory muscular system including intercostal muscles, scalene muscles, the sternocleidomastoid muscle, and the diaphragm and abdominal wall muscles. Volumetric and pressure measurement procedures for the lungs and both the thoracic and abdominal chambers were also implemented. Validation of the respiratory module was assessed by comparing a simulated maximum inspiration maneuver to volunteer studies in the literature. Validation parameters included lung volume changes, rib rotations, diaphragm shape and vertical deflexion, and intra-abdominal pressure variation. The HUMOS model, initially dedicated to road safety research, could be turned into a promising, realistic 3D model of respiration with only minor modifications.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Normalized active (fa) and passive (fp) 1D contraction unit behaviors. Fmax is the maximum isometric force (at optimum length), and the relative elongation is the ratio of instantaneous length over optimum length.

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Figure 2

The modified anthropomorphic FE model. Volumic muscles, membranes, and fats are hidden.

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Figure 3

Illustration of the diaphragm and ribcage modifications during a full respiratory cycle. Soft tissues except skin and diaphragm are hidden in the figure.

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Figure 4

Variation in the total relative lung volume during the respiratory cycle (where V is the current volume and Vo the model lung volume at FRC)

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