Small rotary blood pump for portable heart-lung machine

Abstract

The invention discloses a small rotary blood pump for a portable heart-lung machine. The small rotary blood pump comprises a blood pump shell, a motor and a blood pump impeller, the motor comprises amotor stator and a motor rotor, the motor stator is internally provided with a coil and fixed into the blood pump shell, magnetic steel is mounted on the motor rotor, the space between the motor rotorand the motor stator is filled with liquid, the blood pump impeller is fixed to the motor rotor, a blood pump inlet is formed in the position, corresponding to the front face of the blood pump impeller, on the blood pump shell, and a blood pump outlet is formed in the position, corresponding to the side face of the blood pump impeller, on the blood pump shell. A fluid film bearing formed when themotor rotor rotates at the high speed is utilized to avoid mechanical friction between the motor stator and the motor rotor, noise is effectively lowered, and the working life is prolonged. The smallrotary blood pump is small in size, low in weight and low in cost, and when the small rotary blood pump is used for the heart-lung machine, a patient can be easily transferred from an operating roomto an intensive care unit.

Description

technical field [0001] The invention relates to the field of medical equipment, in particular to a small rotary blood pump for a portable heart-lung machine. It is mainly used for extracorporeal circulation with a portable heart-lung machine, or to assist a patient's failing heart to maintain normal blood circulation. Background technique [0002] Heart failure is a disease that seriously threatens human life. When traditional drug therapy has certain limitations and cannot achieve satisfactory results, and heart transplantation faces difficulties such as lack of donors and postoperative rejection, researchers have proposed using mechanical devices to treat heart failure. A way to help the heart recover has developed a ventricular assist device. Ventricular assist device (Ventricular assist device, VAD) is an artificial mechanical device that draws blood from the venous system or the heart out of the transmembrane lung or directly pumps it into the arterial system, and part...

AI Technical Summary

Problems solved by technology

[0003] At present, most of the blood pumps used for extracorporeal circulation (cardiopulmonary bypass) are rotor pumps, which are large in size, heavy in weight, and inconvenient to move. Moreover, the hemolysis of the rotor pump is serious, and they can only run for about two hours, which cannot meet the clinical needs.

The recently developed magnetic levitation centrifugal pump is expensive and increases the burden on patients

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