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Bilayer Stiffness Identification of Soft Tissues by Suction

Article dans une revue avec comité de lecture
Auteur
ccCONNESSON, Nathanael
1069746 Biomécanique des Tissus Vivants et des Matériaux – Modélisation et Caractérisation [TIMC-BIOMÉCA]
ccBRIOT, Noémie
1069746 Biomécanique des Tissus Vivants et des Matériaux – Modélisation et Caractérisation [TIMC-BIOMÉCA]
ccROHAN, Pierre-Yves
1001017 Institut de Biomécanique Humaine Georges Charpak [IBHGC]
ccBARRAUD, Pierre Alain
1043054 Gestes Medico-chirurgicaux Assistés par Ordinateur [TIMC-GMCAO]
ELAHI, Seyed Ali
1043054 Gestes Medico-chirurgicaux Assistés par Ordinateur [TIMC-GMCAO]
PAYAN, Yohan
1069746 Biomécanique des Tissus Vivants et des Matériaux – Modélisation et Caractérisation [TIMC-BIOMÉCA]

URI
http://hdl.handle.net/10985/25461
DOI
10.1007/s11340-023-00946-x
Date
2023-03
Journal
Experimental Mechanics

Résumé

Background In vivo mechanical characterisation of biological soft tissue is challenging, even under moderate quasi-static loading. Clinical application of suction-based methods is hindered by usual assumptions of tissues homogeneity and/or time-consuming acquisitions/postprocessing. Objective Provide practical and unexpensive suction-based mechanical characterisation of soft tissues considered as bilayered structures. Inverse identification of the bilayers’ Young’s moduli should be performed in almost real-time. Methods An original suction system is proposed based on volume measurements. Cyclic partial vacuum is applied under small deformation using suction cups of aperture diameters ranging from 4 to 30 mm. An inverse methodology provides both bilayer elastic stiffnesses, and optionally the upper layer thickness, based on the interpolation of an off-line finite element database. The setup is validated on silicone bilayer phantoms, then tested in vivo on the abdomen skin of one healthy volunteer. Results On bilayer silicone phantoms, Young’s moduli identified by suction or uniaxial tension presented a relative difference lower than 10 % (upper layer thickness of 3 mm). Preliminary tests on in vivo abdomen tissue provided skin and underlying adipose tissue Young’s Moduli at 54 kPa and 4.8 kPa respectively. Inverse identification process was performed in less than one minute. Conclusions This approach is promising to evaluate elastic moduli in vivo at small strain of bilayered tissues.

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