Comparison of Stent Designs with Biodegradable Materials: Cobalt Chromium CoCr L605 And Magnesium-Based Alloy AZ31 to Obtain Optimization Parameters Using the Response Surface Method
DOI:
https://doi.org/10.11594/nstp.2025.4803Keywords:
Abaqus student, cobalt-chromium, finite element analysis, magnesium, stent, von mises stressAbstract
Cardiovascular diseases, including coronary artery disease, are among the leading causes of death worldwide. One of the common treatment methods is stent placement. Extensive research has been conducted to develop stents, including studies on the materials used. Optimizing stent design parameters is crucial to ensure safe and effective clinical performance. This study aims to determine the optimal design parameters that can achieve safe von Mises stress, minimal radial and longitudinal recoil, and maximum expansion diameter. The research involves expansion tests on a BT S<< stent model made from cobalt-chromium alloy CoCr L605 and magnesium alloy AZ31 using Finite Element Analysis (FEA) with Abaqus Student software. Simulations were conducted on stents with thicknesses of 50 µm, 60 µm, and 70 µm, under expansion pressures of 0.15 MPa, 0.13 MPa, and 0.55 MPa, respectively. The results of this study indicate that optimizing stent design plays a crucial role in improving the success of stent placement procedures, extending the functional lifespan of stents, and reducing the risk of complications that may affect patient clinical outcomes. Based on the results of this study, the optimization of stent design parameters using cobalt-chromium CoCr L605 alloy and magnesium-based AZ31 alloy through the response surface method indicates that the optimal parameters to achieve safe von Mises stress, minimal radial recoil, minimal longitudinal recoil, minimal shortening, and maximum expansion diameter are as follows: for the cobalt-chromium CoCr L605 material, the optimal stent thickness is 50 µm with an expansion pressure of 0.29955 MPa. For the magnesium-based AZ31 alloy, the optimal thickness is 63.5354 µm with an expansion pressure of 0.230 MPa. The optimal results show that for the stent made from cobalt-chromium CoCr L605, the von Mises stress is 709 MPa, radial recoil is 3.59%, longitudinal recoil is -0.78%, shortening is 3.50%, and the expansion diameter is 2.1 mm. Meanwhile, for the stent made from the magnesi-um-based AZ31 alloy, the optimal von Mises stress is 63.5354 MPa, radial recoil is 6.43%, longitudinal recoil is -3.20%, shortening is 13.77%, and the expansion diameter is 3.1 mm.
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Copyright (c) 2025 Muhammad Fadly Hi. Abbas, Sukiman B., Lita Asyriati , Mohammad Muzni Harbelubun, Sandi Rais, Syarif Al Fajrin
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