Hemodynamic study of blood flow in the aorta during the interventional robot treatment using fluid–structure interaction

Abstract

An interventional robot is a means for vascular diagnosis and treatment, and it can perform dredging, releasing drug and operating. Normal hemodynamic indicators are a prerequisite for the application of interventional robots. The current hemodynamic research is limited to the absence of interventional devices or interventional devices in fixed positions. Considering the coupling effect of blood, vessels and robots, based on the bi-directional fluid–structure interaction, using the computational fluid dynamics and particle image velocimetry methods, combined with the sliding and moving mesh technologies, we theoretically and experimentally study the hemodynamic indicators such as blood flow lines, blood pressure, equivalent stress, deformation and wall shear stress of blood vessels when the robot precesses, rotates or does not intervene in the pulsating blood flow. The results show that the intervention of the robot increase the blood flow rate, blood pressure, equivalent stress and deformation of the vessels by 76.4%, 55.4%, 76.5%, and 346%, respectively. The operating mode of the robot during low-speed operation has little impact on the hemodynamic indicators. Using the methyl silicone oil as the experimental fluid, the elastic silicone pipe as the experimental pipe, and the intervention robot having a bioplastic outer shell, the velocity of the fluid around the robot is measured on the developed experimental device for fluid flow field in a pulsating flow when the robot runs. The experimental results are similar to the numerical results. Our work provides an important reference for the hemodynamic study and optimization of the mobile interventional devices.

The Effect of Transverse Sinus Stenosis Caused by Arachnoid Granulation on Patients with Venous Pulsatile Tinnitus: A Multiphysics Interaction Simulation Investigation

“…The fluid–structure interaction interface in this study is the interface between the venous blood fluid domain and the solid domains of the venous blood vessel, which needs to follow the basic conservation principle. The dynamic and kinematic condition equations are shown in Equations (7) and (8) [ 15 ]: where and are the stress tensor of fluid and solid at the interface, respectively. is the fluid displacement at the interface, is the solid displacement at the interface, and and are the fluid and solid normal vector at the interface, respectively.…”

“…The fluid-structure interaction interface in this study is the interface between the venous blood fluid domain and the solid domains of the venous blood vessel, which needs to follow the basic conservation principle. The dynamic and kinematic condition equations are shown in Equations ( 7) and ( 8) [15]:…”

Analysis of the spiral structure and operating parameters of a vascular robot

“…In order to verify the rationality of the numerical calculation method in this paper, a measurement system for pulsating fluid flow field in the pipe with the magnetic interventional robot was constructed [21], as shown in Fig. 14.…”

“…Li et al constructed a FSI model of the aortic root and studied the hemodynamic parameters such as blood pressure, flow velocity, pressure gradient, pressure difference and WSS after implanting a biological valve, which can provide an important reference for the valve design in the aortic valve replacement surgery [20]. Liang et al considered the FSI and studied the fluid velocity, blood pressure, WSS and vascular deformation when a microrobot intervened into a blood vessel [21].…”