The Structure Design And Haemolysis Prediction Of An Axial Flow Maglev Blood Pump

Heart failure is one of the major cardiovascular diseases to human nowadays. Heart transplantation is an effective way in the treatment of heart failure, but the shortage lies in the lack of donors. Axial flow maglev blood pump, as an alternative to heart transplantation, can effectively alleviate this shortage. It adopts magnetic force to suspend the impeller rotor, so the pump has several advantages, such as no friction, no contact, no lubrication in blood pump, lower energy consumption and longer lifetime. And the tubular shape is more suitable for implantation of human, all of these make axial flow maglev blood pump become important research hot spot.The stable levitation of the blood pump impeller is a premise to work safely and normally. And impeller structure affects blood pump's fluid dynamics directly, and it is the most basic condition for the blood pump to meet human physiological needs. Therefore, the structure of magnetic bearing and the impeller is the main research content of axial flow maglev blood pump.On the basis of summary and conclusion to domestic and overseas researches, the finite element simulation is adopted to design axial flow maglev blood pump's flow structure, magnetic bearing structure, and position monitoring structure, and to optimize the structure of the impeller. Then, the overall structure of an axial flow maglev blood pump has been designed.By the use of ANSYS software, the axial permanent magnetic bearing and radial permanent magnet biased bearing have been designed. The arrangement of the magnetic circuit has been designed rationally, which makes the small size blood pump can withstand greater axial load finally.Combined with human physiological needs, the structure of the impeller has been designed. Fluent software is adopted to make fluid simulation analysis of blood pump chamber. Then, the relationships between blood pump's fluid properties and blade thickness, blade height, blade import and export angular and the front and rear guide size are discussed. The hemolysis model of the axial blood pump has been built. Particle tracking method is used to get blood pump's hemolysis prediction.