Optimal design and analysis of a novel magnetic drive blood pump

Utilizing magnetic coupling to drive the artificial heart blood pump in a non-contact and wireless manner offers a viable solution that can effectively avoid problems such as percutaneous lead infection. However, the existing magnetic drive blood pumps have problems such as low utilization efficiency and limited transmission torque due to significant leakage of permanent magnets. To address these limitations, this paper introduces a magnetic modulation-based magnetic drive blood pump, which uses salient pole iron sheets to modulate the magnetic field generated by permanent magnets, thereby minimizing leakage and enhancing the efficiency of permanent magnet utilization. Through finite element analysis of electromagnetic fields, the magnetic circuit structure of the magnetic modulation type magnetic drive blood pump is optimized. Additionally, the influence of the air gap distance of the magnetic drive blood pump on transmission performance is analyzed. Finally, a comprehensive experimental setup for blood pump is developed. By measuring the load torque and spatial magnetic flux density parameters of the magnetic drive blood pump and comparing them to the simulation outcomes, the effectiveness of the proposed magnetic modulation type blood pump is verified.