A novel all-in-one magnetic pump and power harvester design for bio-medical applications

This paper presents a magnetic centrifugal pump with a magnetic power harvester (all-in-one system) for medical applications. The proposed pump is driven by an external rotating magnetic field. To produce pressure and electrical power, an all-in-one device consisting of a pump and a power harvester was designed. It consists of a multi-stage impeller, a disc type NdFeB permanent magnet, and a fixed wound coil on the pump case. The rotation of the rotor creates a continuous flow of liquid through the pump, with a pressure head, and an electrical power is generated in the wound coil because of the rotating magnetic field. The maximum flow rate and pressure are 5000 ml min−1 and 16 kPa, respectively, at 100 Hz. These results meet the requirements of an artificial heart assistance blood pump. Under these operating conditions, the harvested voltage can reach a maximum of 8.2 Vp−p. With this configuration and control method, wireless and battery-free operation is possible, which is required in the medical field. Moreover, the power harvester can monitor the pump conditions without additional electrical power and can provide electrical power to other implanted electrical devices. The performances of the pump and power harvester were verified in a laboratory experiment. Overall, the proposed system acts as a pump and a power harvester that is fully wireless and battery-free.