Hyperelastic characterization of synthetic mesh for abdominal wall hernia repair
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MRS Advances © 2019 Materials Research Society DOI: 10.1557/adv.2019.399
Hyperelastic characterization of synthetic mesh for abdominal wall hernia repair Javier Ortiz Ortiz1, Georgina Carbajal de la Torre1*, Miguel Villagómez Galindo1, Marco Antonio Espinosa Medina1, Hilda Aguilar Rodriguez1 1
Mechanical Engineering Department, Laboratory of Materials, Universidad Michoacana de San Nicolas de Hidalgo
ABSTRACT Hernia is defined as the protrusion of one or several internal organs through an opening in the cavity that contains them due to a tissue defect, abdominal wall surgery by means of synthetic meshes is the most common method used for hernia repair, however, postsurgical effects can range from some discomfort, to chronic pain and even the reappearance of the hernia due to a poor mechanical adaptability between the synthetic tissue and the host tissue. The knowledge of the mechanical properties of the materials involved in hernia repair is fundamental in the understanding and subsequent solution of this type of problems. In this work, experimental data were obtained by means of uniaxial tensile tests in two perpendicular directions of commercial meshes used in hernia repair. The tests were carried out on the UniVert® machine of the CellScale® brand. Anisotropic mechanical behavior is observed due to the structure of the mesh and the interaction between each of the yarns that make it up. The data found vary with respect to the direction of traction and also has non-linear hyperelastic behavior, so the adjustment of curves was made through a hyperelastic model in the COMSOL Multiphysics® software through the Levenberg-Marquardt Algorithm for the characterization of these materials. Keywords: Hyperelastic model, hernia repair, synthetic mesh.
INTRODUCTION A hernia is defined as the protusion of one or several internal organs through an opening in the cavity that contains them due to a weakening of the wall of the same. Abdominal wall hernia is the most common disorder that requires major surgery, despite its frequency of surgical repair, surgeons still do not achieve perfect results and the rate of surgical failure is high [1][2].
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Surgical interventions are based on the insertion of a prosthetic material to strengthen the abdominal wall. The choice of a suitable surgical mesh is fundamental to obtain successful interventions. One of the most relevant properties of suitable meshes is the biomechanical compatibility between the implant and surrounding native tissues [3]. The knowledge of the mechanical behavior of the abdominal wall and the materials involved in their repair is essential to understand the physiology of this tissue and also for the development of treatments and techniques to deal with the problem related to abdominal hernia [4]. The materials involved in abdomi
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