Design optimizations of PLA stent structure by FEM and investigating its function in a simulated plaque artery. (English) Zbl 1510.92070
Summary: Proper design and optimization in stent parameters are required for efficient use of stents in coronary arteries. Efficiency depends on features including resistance against vessel pressures, (Radial Strength) limited variation in length during expansion (Foreshortening & Recoil) and resistance of stents in periodic/cyclic pressure & tension of heart pulsation (Fatigue Life Cycle). It is customary to design a stent based upon materials endurance limit which is equivalent to 0.5 of the yield strength for stainless steel in order to accomplish physically infinite life cycle for the stent.
Different atherosclerosis removal rates are reported by various stent designs. Hence, considering the significance of designs and costly classic methods of producing prototypes, using finite element analysis is beneficial due to the high efficiency and accuracy as well as lower costs. In this study a biocompatible polymeric stent (PLA) is designed by SolidWorks software and influence of designing parameters including longitudinal pattern (Cell) number, circular-circumferential pattern (Cell) number, connection of cells by N, M, or W type flex connector, radius curve, thickness, maximum and minimum width on the mechanical properties such as contact force, foreshortening and maximum stress are estimated by FEM on over 58000 models. The effective design parameters are subsequently optimized to obtain the best model for the stent. Performance of the optimized stent is then investigated in a simulated artery suffering from a 49% non-uniform plaque and after the implementation of the stent in the artery, the inner area of the cross section of the artery increased by 74 percent which demonstrates improvement in blood flow by 74 percent. Results can be useful in designing and optimizing stents for non-uniform restenosis conditions.
Different atherosclerosis removal rates are reported by various stent designs. Hence, considering the significance of designs and costly classic methods of producing prototypes, using finite element analysis is beneficial due to the high efficiency and accuracy as well as lower costs. In this study a biocompatible polymeric stent (PLA) is designed by SolidWorks software and influence of designing parameters including longitudinal pattern (Cell) number, circular-circumferential pattern (Cell) number, connection of cells by N, M, or W type flex connector, radius curve, thickness, maximum and minimum width on the mechanical properties such as contact force, foreshortening and maximum stress are estimated by FEM on over 58000 models. The effective design parameters are subsequently optimized to obtain the best model for the stent. Performance of the optimized stent is then investigated in a simulated artery suffering from a 49% non-uniform plaque and after the implementation of the stent in the artery, the inner area of the cross section of the artery increased by 74 percent which demonstrates improvement in blood flow by 74 percent. Results can be useful in designing and optimizing stents for non-uniform restenosis conditions.
Software:
SolidWorksReferences:
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