[In vitro testing of a new implantable ventricular assist rotary pump made in China]

We have measured the hemodynamic properties of the rotary pump in order to give directions for use in animal test and even in clinical application. In our mocking circulation circuit, under definite preload, the inner diameter of inlet and outlet cannulae and the afterload have been changed for measuring the pressure of input and output of the pump and the pump flowing rate when it runs under 75% maxim working condition. The results demonstrate that with the cannulae of inner diameter of 8 mm as drainage, the pump provides 5.32 L/min of output against a mean afterload of average 60 mmHg(1 mmHg = 0.133 kPa) with a filling pressure of 10 mmHg. With the cannulae usually used in clinical setting, the flowing rates are more than 1.5 L/min against a mean afterload of 90 mmHg, and all output pressure of the pump is higher than 120 mmHg. In conclusion, the volume of the rotary pump is small, the needed power is low, and the hemodynamic parameters are suitable for animal test and even for clinical use.