Archive ouverte HAL - In-Vivo Soft Tissues Mechanical Characterization: Volume-Based Aspiration Method Validated on Silicones

In-Vivo Soft Tissues Mechanical Characterization: Volume-Based Aspiration Method Validated on Silicones

Seyed Ali Elahi 1 Nathanaël Connesson 1 Grégory Chagnon 1 Yohan Payan 2
1 TIMC-IMAG-BioMMat - Ingénierie Biomédicale et Mécanique des Matériaux
TIMC-IMAG - Techniques de l'Ingénierie Médicale et de la Complexité - Informatique, Mathématiques et Applications, Grenoble
2 TIMC-IMAG-GMCAO - Gestes Medico-chirurgicaux Assistés par Ordinateur
TIMC-IMAG - Techniques de l'Ingénierie Médicale et de la Complexité - Informatique, Mathématiques et Applications, Grenoble
Abstract : Simulating the deformations of soft tissues has gained importance in recent years due to the development of 3D patient-specific biomechanical models in the context of Computer Assisted Medical Interventions. To design such models, the mechanical behavior of each soft tissue has to be characterized in-vivo. In this paper, a volume-based aspiration method for in-vivo mechanical characterization of soft tissues was validated on synthetic materials. For this purpose, two silicones with slightly different stiffnesses were made. Samples were characterized using (1) aspiration, and, as references, two classical tests such as (2) uniaxial and (3) equibiaxial extension tests. Performing a Finite Element (FE) inverse identification on the experimental results provided Young's moduli similar to classical tests with about 7% maximum overestimation for the two silicones. This highlighted a significant improvement of the measurement method accuracy compared to the literature (about 30% relative overestimation). 2 S.A. Elahi et al. Eventually, the aspiration method ability to discriminate the two silicones was also tested and proven to be similar to classical characterization tests. Based on the presented results, relative mechanical behavior mapping of soft tissues (organ or skin) is possible without requiring an inverse characterization procedure.
Type de document :
Article dans une revue
Experimental Mechanics, Society for Experimental Mechanics, 2019
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https://hal.archives-ouvertes.fr/hal-01974859
Contributeur : Grégory Chagnon <>
Soumis le : mercredi 9 janvier 2019 - 09:14:25
Dernière modification le : jeudi 17 janvier 2019 - 22:10:10

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  • HAL Id : hal-01974859, version 1

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Seyed Ali Elahi, Nathanaël Connesson, Grégory Chagnon, Yohan Payan. In-Vivo Soft Tissues Mechanical Characterization: Volume-Based Aspiration Method Validated on Silicones. Experimental Mechanics, Society for Experimental Mechanics, 2019. 〈hal-01974859〉

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