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Keywords: biomechanics, identification, finite element modelling, experiment, hernia.

Summary

A human ventral hernia is a leak in a musculo-fascial component of the front abdominal wall caused by a fascia defect. The fascia is a load carrying soft medium, which keeps the human bowels and other organs inside of the abdominal cavity. Ventral hernia repair is nowadays a well recognized matter in surgery and advanced techniques of operating have been developed. However, mechanical properties of the system after an operation are not known so the implantation of the repairing mesh is quite intuitive and consequent recurrence of the illness may happen [1,2].

The tissue-implant system in a human body can be modelled as a mechanical structure, that allows one to recognize and simulate the tissue and mesh behaviour.

The paper deals with mechanical tests of the human abdominal fascia, identification of material parameters and some numerical simulation of the tissue behaviour. Since its mechanical properties are not available, the stress-strain relation of the fascia has been investigated in an experiment. The laboratory one-dimensional stretching tests have been made using the Zwick Roell machine [3]. The experiment has been carried out for fascia samples taken from human abdomens of patients of various ages and different sexes. A few constant velocities of testing have been considered. Stretching load and elongation have been measured. The Young's modulus and the Poisson's ratio obtained from the stress-strain relations, have been specified in the linear elastic range.

The structural behaviour of the tissue tested has been simulated using the finite element method [4]. The calculations have been performed using the MSC.Marc system with application of membrane isoparametric four-node finite elements with three degrees-of-freedom per node. The constitutive model of the human fascia formulated on an experimental basis has been proposed and applied in the mechanical analysis.

References

1: L.J. Sanchez, L. Bencini, R. Moretti, "Recurrences after laparoscopic ventral hernia repair: results and critical review", Hernia, 8(2), 138-143, 2004. doi:10.1007/s10029-003-0195-0
2: G.M. Eid, J.M. Prince, S.G. Mattar, G. Hamad, S. Ikrammudin, P.R. Schauer, "Medium-term follow-up confirms the safety and durability of laparoscopic ventral hernia repair with PTFE", Surgery, 134(4), 599-603, 2003. doi:10.1016/S0039-6060(03)00283-6
3: I. Lubowiecka, C. Szymczak, A. Tomaszewska, M. Smietanski, "Mathematical study of a tissue-implant connection in a ventral hernia repair in a context of the system's parameters", PAMM Proc. Appl. Math. Mech. 9, 167-168, 2009. doi:10.1002/pamm.200910058
4: D.C. Pamplona, P.B. Gonçalves, S.R.X. Lopes, "Finite Element eformations of cylindrical membrane under internal pressure", International Journal of Mechanical Sciences, 48, 683-696, 2006. doi:10.1016/j.ijmecsci.2005.12.007

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Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 94 PROCEEDINGS OF THE SEVENTH INTERNATIONAL CONFERENCE ON ENGINEERING COMPUTATIONAL TECHNOLOGY Edited by: Paper 153 Mechanical Modelling of Human Fascia in the Problem of Ventral Hernia Repair I. Lubowiecka¹, A. Tomaszewska¹, C. Szymczak¹ and M. Smietanski² ¹Department of Structural Mechanics and Bridge Structures, Gdansk University of Technology, Poland ²Department of General, Endocrine Surgery and Transplantation, Medical University of Gdansk, Poland doi:10.4203/ccp.94.153 purchase the full-text of this paper Full Bibliographic Reference for this paper I. Lubowiecka, A. Tomaszewska, C. Szymczak, M. Smietanski, "Mechanical Modelling of Human Fascia in the Problem of Ventral Hernia Repair", in , (Editors), "Proceedings of the Seventh International Conference on Engineering Computational Technology", Civil-Comp Press, Stirlingshire, UK, Paper 153, 2010. doi:10.4203/ccp.94.153 Keywords: biomechanics, identification, finite element modelling, experiment, hernia. Summary A human ventral hernia is a leak in a musculo-fascial component of the front abdominal wall caused by a fascia defect. The fascia is a load carrying soft medium, which keeps the human bowels and other organs inside of the abdominal cavity. Ventral hernia repair is nowadays a well recognized matter in surgery and advanced techniques of operating have been developed. However, mechanical properties of the system after an operation are not known so the implantation of the repairing mesh is quite intuitive and consequent recurrence of the illness may happen [1,2]. The tissue-implant system in a human body can be modelled as a mechanical structure, that allows one to recognize and simulate the tissue and mesh behaviour. The paper deals with mechanical tests of the human abdominal fascia, identification of material parameters and some numerical simulation of the tissue behaviour. Since its mechanical properties are not available, the stress-strain relation of the fascia has been investigated in an experiment. The laboratory one-dimensional stretching tests have been made using the Zwick Roell machine [3]. The experiment has been carried out for fascia samples taken from human abdomens of patients of various ages and different sexes. A few constant velocities of testing have been considered. Stretching load and elongation have been measured. The Young's modulus and the Poisson's ratio obtained from the stress-strain relations, have been specified in the linear elastic range. The structural behaviour of the tissue tested has been simulated using the finite element method [4]. The calculations have been performed using the MSC.Marc system with application of membrane isoparametric four-node finite elements with three degrees-of-freedom per node. The constitutive model of the human fascia formulated on an experimental basis has been proposed and applied in the mechanical analysis. References 1 L.J. Sanchez, L. Bencini, R. Moretti, "Recurrences after laparoscopic ventral hernia repair: results and critical review", Hernia, 8(2), 138-143, 2004. doi:10.1007/s10029-003-0195-0 2 G.M. Eid, J.M. Prince, S.G. Mattar, G. Hamad, S. Ikrammudin, P.R. Schauer, "Medium-term follow-up confirms the safety and durability of laparoscopic ventral hernia repair with PTFE", Surgery, 134(4), 599-603, 2003. doi:10.1016/S0039-6060(03)00283-6 3 I. Lubowiecka, C. Szymczak, A. Tomaszewska, M. Smietanski, "Mathematical study of a tissue-implant connection in a ventral hernia repair in a context of the system's parameters", PAMM Proc. Appl. Math. Mech. 9, 167-168, 2009. doi:10.1002/pamm.200910058 4 D.C. Pamplona, P.B. Gonçalves, S.R.X. Lopes, "Finite Element eformations of cylindrical membrane under internal pressure", International Journal of Mechanical Sciences, 48, 683-696, 2006. doi:10.1016/j.ijmecsci.2005.12.007 purchase the full-text of this paper (price £20) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £125 +P&P)
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