PSI - Issue 18

S.V. Slovikov et al. / Procedia Structural Integrity 18 (2019) 198–204 S.V. Slovikov and O.A.Staroverov / Structural Integrity Procedia 00 (2019) 000–000

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6-7 kPa, the forces arising in the muscle layer (muscles are the cause of increased pressure) begin to play a significant role, and the stress-strain state of such an element must be considered using a different model taking into account the muscle layer. If aponeurosis mainly works in statics, then muscle tissues work at dynamic high pressures (Tran et al., 2014; Parshikov et al., 2016). The simulation shows that the stiffness and strength properties of the aponeurosis are not enough to prevent high strains caused by IAP jumps (more than 7 kPa) and to clarify the full picture, it is necessary to take into account the influence of muscles on the deformation picture of the abdominal region. There are various approaches for creating biomechanical models of the abdominal region (Kuzin et al., 2001; Hernández-Gascón et al., 2013; Lyons et al., 2015). At the same time, for the tasks of precisely restoring the mechanical properties of the aponeurosis and evaluating the materials used at this stage of the study, this seems to be sufficient. 4. Conclusion The analysis of the mechanical properties of polymeric knitted meshes used for hernioplasty of living tissues shows that the use of "heavy" meshes can cause increased strain of the tissues in the areas adjacent to the defect if the patient’s aponeurotic tissue is less rigid than the mesh. This, in turn, will lead to the deterioration of living tissue over time. With a high intra-abdominal pressure in the area implantation "light" mesh, increased strain occur, since the stiffness of the aponeurotic tissue becomes greater than the stiffness of the mesh. The difficulty for the surgeon is to assess the state of the aponeurotic tissue in the area adjacent to the hernial defect. It seems necessary to develop more complex in the structure of composite meshes, in which, with increasing mesh strain, the stiffness would increase, which replicates the mechanical behavior of recovered living tissues and specifically aponeurosis. Acknowledgements The work was performed as part of the fulfillment of the state task of the Ministry of Education and Science of Russia No. 9.7695.2017/9.10. References Coda A, Lamberti R, Martorana S., 2012. Classification of prosthetics used in hernia repair based on weight and biomaterial. Hernia. 16 (1), 9–20. Deeken, C.R. and Lake, S.P., 2017. Mechanical properties of the abdominal wall and biomaterials utilized for hernia repair. Journal of the Mechanical Behavior of Biomedical Materials.74, 411–442. Doneva M, Pashkouleva D.,2018. Investigation of mechanical compatibility of hernia meshes and human abdominal fascia. Bio-Medical Materials and Engineering. 29(2), 147–158. Fung Y.C., 1967. The elasticity of soft tissues in simple elongation. Amer. J. Physiology. 213, 1532–1544. Fung Y.C., 1975. On mathematical models of stress-strain relationship for living soft tissues. Polymer Mechanics. 11(5), 726–740. Fung Y.C., 1993. Biomechanics: mechanical properties of living tissues. New York: Springer. 568. Gräßel, D., Prescher, A., Fitzek, S., Keyserlingk, D.G.V., Axer, H., 2005. Anisotropy of Human Linea Alba: A Biomechanical Study. Journal of Surgical Research. 124(1), 118–125. Grigoryuk, A.A., 2011. The structure of aponeurosis the anterior abdominal wall rights in norm and pathology. Vestnik novykh meditsinskikh tekhnologiy. 18 (2), 104–106. Hanley, P.J., et al., 1999. 3-Dimensional configuration of perimysial collagen fibres in rat cardiac muscle at resting and extended sarcomere lengths. Journal of Physiology. 517(3), 831–837. Hernández-Gascón B., Peña E., Grasa J., Pascual G., Bellón J. M., Calvo B., 2013. Mechanical response of the herniated human abdomen to the placement of different prostheses. Journal of Biomechanical Engineering. 135(5), 51004. Hernández-Gascón B., Peña E., Melero H., Pascual G., Doblaré M., Ginebra M.P., Bellón J.M., Calvo B., 2011. Mechanical behaviour of synthetic surgical meshes: Finite element simulation of the herniated abdominal wall. Acta Biomaterialia. 7(11), 3905 – 3913. Huntington, C.R., Cox, T.C., Blair, L.J., (...), Heniford, B.T., Augenstein, V.A., 2016. Biologic mesh in ventral hernia repair: Outcomes, recurrence,and charge analysis. Surgery. 160(6), 1517–1527. Kirilova M, Stoytchev S., Pashkouleva D., Kavardzhikov V., 2011. Experimental study of the mechanical properties of human abdominal fascia. Medical Engineering & Physics . 33(1), 1–6. Chow Ming-Jay, Zhang Yanhang, 2011. Changes in the Mechanical and Biochemical Properties of Aortic Tissue due to Cold Storage. Journal of Surgical Research.171, 434–442.