Comparison of LASTIC (Light Aspiration device for in vivo Soft TIssue Characterization) with classic Tensile Tests.

Emmanuel Promayon (1) , Vincent Luboz (1) , Grégory Chagnon (2) , Thierry Alonso (2) , Denis Favier (2) , Christine Barthod (3) , Yohan Payan (1)

1 TIMC-IMAG-GMCAO - Gestes Medico-chirurgicaux Assistés par Ordinateur
2 3SR - Laboratoire sols, solides, structures - risques [Grenoble]
3 SYMME - Laboratoire SYstèmes et Matériaux pour la MEcatronique

LASTIC is a device estimating in vivo soft tissue elasticity. It uses negative pressure to deform the tissue surface and captures several deformation stages to trace the behavioral curve. Using Finite Element inverse analysis and a Neo Hookean constitutive law, the tissue's Young modulus is evaluated. This paper compares LASTIC capabilities with standard tensile tests on four samples with elastic properties ranging from 10 kPa to 100 kPa. Although LASTIC overestimates Young modulus by an average of 24 %, it allows a first estimation of the elastic modulus of different materials.

Mots clés: finite element model; constitutive law; aspiration device; in vivo; biomechanics; computer assisted surgery

Domaines: Biomécanique [physics.med-ph]; Ingénierie biomédicale; Modélisation et simulation; Biomécanique [physics.med-ph]

Emmanuel Promayon, Vincent Luboz, Grégory Chagnon, Thierry Alonso, Denis Favier, et al.. Comparison of LASTIC (Light Aspiration device for in vivo Soft TIssue Characterization) with classic Tensile Tests.. Advanced experimental approaches and inverse problems in tissue biomechanics., 2012, Saint-Etienne, France. pp.75-76. ⟨hal-00705487⟩