Validation of a Light Aspiration device for in vivo Soft TIssue Characterization (LASTIC)

Vincent Luboz (1) , Emmanuel Promayon (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

In-vivo characterization of soft tissue is a key step towards accurate biomechanical simulation enabling planning and intra-operative assisted surgery. This chapter presents the new version of LASTIC, a device measuring soft tissue deformations using a negative pressure. Its capabilities are compared with standard tensile tests on five samples with different elastic properties, i.e Young modu-lus, from 10 kPa to 1 MPa, in order to estimate its accuracy and define the functional measurement range. Results show that LASTIC overestimates Young modulus by an average of 24 % compared to the tensile devices. This error, although rather large, allows a first estimation of the elastic modulus of different materials, especially living tissues, even during surgery. Directions for improve-ments are given that will allow for better patient-specific biomechanical simula-tions of soft tissues.

Mots clés: mechanical behavior; inverse analysis; planning and assistance; aspiration pipette; soft tissue characterization

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

Vincent Luboz, Emmanuel Promayon, Grégory Chagnon, Thierry Alonso, Denis Favier, et al.. Validation of a Light Aspiration device for in vivo Soft TIssue Characterization (LASTIC). Yohan Payan. Soft Tissue Biomechanical Modeling for Computer Assisted Surgery, Springer-Verlag, pp.243-256, 2012, 978-3-642-29013-8. ⟨10.1007/8415_2012_123⟩. ⟨hal-00706828⟩