Numerical modelling of bioresorbable stents with micro-digital image correlation as models validation method
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Bioresorbable stents are a type of endovascular scaffold that serves as an alternative to metallic prostheses. The design process for these stents is complex due to the material they are made of, requiring both numerical and experimental methods. To meet the design and performance requirements, a newly developed two-step method for creating geometric forms is proposed. This is followed by numerical simulations of experimental tests, including tension, bending, compression (pinch test), and radial force measurement, using the finite element method. To validate the numerical models in the experimental tests conducted on micro-injected stents, we used an optical measurement technique called micro-digital image correlation. This technique is adapted to measure the deformation and strain state of the micro-area. This technique has significant potential, especially in the field of biomaterials, where samples are typically small, irregular, and require non-contact measurement methods. One of the main advantage of the digital correlation method is the colour-coded deformation maps, which can be directly compared with maps obtained by numerical simulations using FEM in a further process. For complex micro-objects like stents, this method has great potential for experimental studies and virtual testing. The methods used to design and test bioresorbable stents, while considering the manufacturing technique, enable the production of stents that meet durability, application, and medical requirements.