The Influence of Plaque Parameters on Blood Flow Characteristics During Vascular Robot Intervention
At present,the study of hemodynamics in atherosclerotic plaque is limited to the situation that there is no interventional device in the vessel or the interventional device is in a fixed position.To ensure the safety of interventional diagnosis and treatment,the bi-directional fluid-structure interaction(FSI)method is used to analyze and compare the influence of robot intervention on hemodynamic parameters.Theoretical calculations are carried out on the blood flow characteristics in the blood vessels under different plaque heights,shoulder widths,and the operating positions of the intervention robot.Particle image velocimetry(PIV)technology is used,combined with the experimental study of the developed magnetic controlled micro robot tube pulsating fluid flow field measurement system.The results indicate that in pulsatile blood flow,the entry of the intervention robot into the blood vessel increases the blood flow velocity,deformation of the vessel wall,and shear stress of the vessel wall.The higher the plaque height and shoulder width,the closer the intervention robot runs to the plaque,and the higher the hemodynamic parameter values.The distribution and magnitude of numerical calculation results are similar to experimental measurement results,which proves the correctness and effectiveness of numerical simulation,and provides a reference for safe vascular robotic interventions.
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