Document Type: Original Paper
Ph.D. Student, Biomedical Engineering Dept., Tarbiat Modares University, Tehran, Iran
Assistant Professor, Biomedical Engineering Dept., Tarbiat Modares Univerisy, Tehran, Iran
Associated Professor, Physiotherapy Dept., Tarbiat Modares University, Tehran, Iran
Introduction: Pressure sores refer to lesions that are produced while a constant pressure causes necrotic
tissue to grow. The need for a better comprehension of the process has led researchers to artificial generation
of pressure sores. Modeling the mechanical behavior of tissue will provide a better understanding of this
process as well as a more suitable selection of system parameters.
Materials and Methods: In this research, the mechanical behavior of tissue was modeled using the finite
element method. A system with pressure sensors and a suitable feedback mechanism was used to generate
pressure sores. The elastic parameters of tissue were obtained using uniaxial tensile strength tests. The
thicknesses of skin layers were calculated by taking microscopic images of skin samples and using Motic
Images 2000 version 1.2 software.
Results: The results of the finite element modeling illustrate the strain and stress profiles in tissue layers. The
maximum values of deviatory strain occurred under the border of the disc in the muscle layer. Deviatory and
shear stresses reached their maximum values under the center of the disc in the skin layers.
Discussion and Conclusion: The simulation and experimental results are in good agreement. Therefore, the
introduced model may be used for better comprehension of tissue behavior. Better results may be obtained by
finding a more accurate method for calculating tissue parameters.