Research On The Model Of The Left Ventricular Maglev Assist Pump Based On 3D Printing

As a type of assist device,left ventricular assist pump has become the focus of attention.At present,there are many researches about the left ventricular assist pump.Hemolysis and thrombus are important criteria for evaluating the performance of the blood pump.Good hemolysis and low thrombus can not only improve the safety of the assist device,but can be used for the development of the permanent implantable left ventricular assist pump.In this paper,the independent research of the left ventricular assist pump is treated as the object of research.By using the computational fluid dynamics,the coupling process between the blade and blood in the pump has been simulated.The effect of the number of blades,blade height,suspension height,and the rotation speed are studied.Using 3D printing technology to manufacture the device and then experiment,which provides a reference for further research in the future.Research shows:In the coupling process,the influence of the rotation speed of the blade on the outlet flow rate and the shear stress of the blade is the biggest,the number and height of the blade is second,and the suspension height is the least;Increasing the blade rotating speed,the maximum shear stress of blade wall and the average flow rate of the outlet will be increased;Increasing the blade height,the maximum shear stress of the blade will be decreased,the average flow rate of the outlet will increase;Increasing the suspension height,the maximum shear stress of blade and the average flow rate of the outlet will decrease;Alone with the increase of the suspension,there will be a decreasing trend of the main flow trace distribution near the structure;With the increase of the blade height,blood flow in the main flow tends to be regular,no vortex and circulation zone appears.However,when the blade height is over height,the flow through the root of the blade structure will be gradually decrease,which is not conducive to the prevention of thrombosis;The rotation speed has little impact on the distribution of the blood flow trace.The results of blood pump and blood interaction are revealed by using the computational fluid simulation software to study the left ventricular assist device.It lays a theoretical foundation for the optimization of the assist pump.The experiment shows that 3D printing technology to manufacture the assist pump to meet the needs of the experiment,and also provides a new idea for the application of 3D printing technology in the medical field.