Measurement of mechanical properties of synthetic vessels using a Man-made Circulatory Model
DOI:
https://doi.org/10.24425/mms.2025.155805Abstract
Ex-vivo vessel culture systems that simulate hemodynamic factors enable the measurement of flow and pressure conditions. However, limited efforts have been made to use ex-vivo vessel bioreactors to accurately replicate the hemodynamic factors influencing arterial wall behaviour in an artificial setting. Therefore, the objective of this study was to examine mechanical properties of different types of vessels (vascular grafts and human arteries) under various hemodynamic conditions using a specialised ex vivo. In addition, the study compared different vascular grafts with human arteries. To achieve this, a Man-made Circulatory Model was designed and constructed to simulate vessel structure under varying flow conditions. The following vessel types were analysed: ring-enforced ePTFE prostheses, Dacron prostheses, and iliac arteries. The initial conditions for the process were: pulsating flow at five frequencies (60, 75, 90, 105, and 120 l/min) and varying ejection volumes (EV) of homemade fluid per cycle (70, 85, 100, and 115 ml). Our findings suggest that pulsation frequency and ejection volume are key factors that influence the performance of these vascular prostheses. In addition, we found that as pulsation frequency increases, the diameter dilation differences between the iliac arteries and prostheses, as well as between the two types of prostheses, also change (𝑝 < 0.0001). Specifically, the difference in dilation between the prostheses and the iliac arteries increases at higher frequencies, but the pattern of this increase varies between the prosthesis types, suggesting differences in their mechanical behaviour under varying conditions of flow (𝑝 < 0.0001). To sum up, our approach may help guide clinical decisions on prosthesis selection.References
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