The present disclosure relates to a rotary blood pump with a double pivot contact bearing system with an operating range between about 50 mL/min and about 1500 mL/min, wherein the force on the upper bearing is less than 3N during operating speeds up to 6000 rpm. The disclosure also relates to a method of using a blood pump system for persistently increasing the overall diameter and lumen diameter of peripheral veins and arteries by persistently increasing the speed of blood and the wall shear stress in a peripheral vein or artery for period of time sufficient to result in a persistent increase in the overall diameter and lumen diameter of the vessel.

A fluid pump assembly is provided. The pump has a pair of units magnetically coupled to each other. The first unit contains a drive motor and a magnetic assembly. The second unit contains a magnetic assembly and a blade of a propeller/impeller for imparting movement to a fluid. As the first unit is activated by the drive motor, a magnetic flux is created which in turn rotates the magnetic assembly in the second unit, driving the blade.

A fluid pump assembly is provided. The pump has a pair of units magnetically coupled to each other. The first unit contains a drive motor and a magnetic assembly. The second unit contains a magnetic assembly and a blade of a propeller/impeller for imparting movement to a fluid. As the first unit is activated by the drive motor, a magnetic flux is created which in turn rotates the magnetic assembly in the second unit, driving the blade.

A portable fan includes: a fan and a power supply drive assembly electrically connected to the fan. The power supply drive assembly comprises a battery and a fan drive circuit electrically connected to the battery. The fan drive circuit includes a master control circuit; a three-phase drive circuit; and an inverted-phase electric potential detection circuit. The battery is configured to supply power to the fan drive circuit.

A portable fan includes a fan and a power supply drive assembly electrically connected to the fan. The power supply drive assembly includes a battery and a fan drive circuit electrically connected to the battery; the fan drive circuit includes: a master control circuit; and a three-phase drive circuit, including at least three signal input ends and three drive signal output ends. Each of the at least three signal input ends is electrically connected to the master control circuit to receive control signals; each of the three drive signal output ends is electrically connect to a respective one of three signal ends of a fan motor to respectively output the three-phase drive signal to drive the fan motor to rotate. The battery is configured to supply power to the fan drive circuit.