An Axial flow blood pump with magnetic fluid mixed support

In this paper, the axial flow blood pump with magnetic-fluid support is presented. With the goal that the implanted blood pump should have the advantages of small volume, light weight and low power consumption, we studied the blood pump structure with permanent radial magnetic bearings and axial fluid-film bearing, designed and calculated the relationship between impeller and blood flow, finally gave the analysis of power calculation. The axial flow blood pump with magnetic fluid mixed support is presented. The motor rotor is supported by 2 radial PM bearings. The assembly of the motor stator and the PM bearing stators is supported (or clamped in place) inside of the 4-blade diffuser. The motor wirings will go through the diffuser vanes. In this paper, two radial bearings are used in the Halbach structure design of the full permanent magnet, and the electromagnetic field simulation is carried out by using the finite element method. The results show that the permanent magnetic bearing of the structure increases the bearing capacity, and reduces the power consumption. In this paper, the total power loss of the blood pump is not more than 10W, and the weight is about 225 grams. The results show that the blood pump with magnetic fluid mixed support can achieve the purpose of reducing power loss and reducing the volume.