Hemodynamic Performance Analysis And Optimization Study On Centrifugal Artificial Heart Pump

With the increase of people’s living pressure, the number of cardiopath is increasing year by year. At present, the treatment of heart disease mainly rely on drugs maintenance and heart surgery. The drugs maintenance is extremely expensive and can’t solve the heart disease fundamentally. At the same time, the shortage of donors makes it limited to put the heart surgery into effect. As a new treatment method, the installation of artificial heart which has the advantage of without waiting for donor, low cost and so on bring the gospel to the majority of patients. Good blood compatibility is the precondition of artificial heart application, and hemodynamic characteristics determines the blood compatibility of the artificial heart pump. Therefore, the research and the improvement of hemodynamic characteristics of artificial heart pump has a great significance in improving blood compatibility.For the centrifugal hydraulic suspension artificial heart pump of third generation, this paper adopts numerical simulation method to study the hemodynamic characteristics and the influence of the hemodynamic characteristics when improving its structure. Based on the centrifugal rotating machinery theory and the basic requirement of artificial heart, the flow field three-dimensional model of centrifugal artificial heart pump is established and verified whether the established model is consistent with the basic requirements of the artificial heart by the simulation calculation of hydraulic performance. Moreover, based on the analysis of flow field and hemolysis, we set up the mutually described relationship between them to analyze the dynamic characteristics of blood flow. According to the disordered flow problem discovered by the flow field analysis, we put forward the optimization scheme and study the structure of the artificial heart pump based on the blood compatibility.According to the simulation analysis results, the hemolysis and thrombosis will be easily caused when the complicated flow phenomenon is occurred in artificial heart pump flow field in the outlet and inlet of impeller and the tongue. It can guarantee that the artificial heart pump has a better blood compatibility to reasonably control the input flow rate and rotation speed to avoid that the flow rate is too big or small or the rotation speed is relatively fast. We can optimize the effect by adding deflection cone at the entrance if impeller, so as to improve the blood compatibility of the artificial heart pump.The hemodynamic characteristics directly determines the reliability of the artificial heart pump. The change of the structural parameters will cause the change of the hemodynamic characteristics of the pump body. Therefore, it is significant to study the hemodynamic characteristics of centrifugal heart pump and the effect of the structure improvement of the pump body for the further research and development of the third generation artificial heart.