撤机对离心血泵血液相容性影响的数值研究

The four stages of blood pump weaning are used to methodically assess the hemodynamic performance and hemocompatibility of the datum and modified centrifugal blood pumps. The distribution of parameters and the changes of normalized index of hemolysis in four stages of weaning are researched, the pressure pulsation of each monitoring point is also analyzed. Results show that both the datum pump and the modified pump own good hemocompatibility, and it satisfies the requirement of anti-hemolysis and anti-thrombosis in the first blood pump weaning stage. The leakage vortex formed in clearance is the main flow characteristic that induces hemolysis. The intensity of leakage vortex becomes weaken, and the index of hemolysis as well as its pulsation decrease significantly during the blood pump weaning process. Compared with the datum pump, the NIH of the modified pump is reduced by more than 30%. The pressure spectrum exhibits typical discrete characteristics, and the modified pump's rotor-stator interaction is stronger than that of the datum pump, indicating a high need for the blood pump's electromagnetic control technology.