A magnetic levitation ventricular assist pump based on nutation principle and its application

Abstract

The invention relates to a magnetic suspension ventricle auxiliary pump based on the nutation principle and application thereof. An upper cover and a lower cover of a pump body are connected with a case to form a fluid cavity in an enclosure mode. A nutation plate with a sphere arranged in the middle is arranged in the fluid cavity. An upper spherical magnet and a lower spherical magnet cover the upper surface and the lower surface of the sphere respectively. An upper magnetic shoe and a lower magnetic shoe corresponding to the upper spherical magnet and the lower spherical magnet are installed in the upper cover and the lower cover respectively. The magnetism of the inner surface of the upper spherical magnet is opposite to that of the inner surface of the lower spherical magnet. The magnetism of the outer surface of the upper spherical magnet is the same as that of the inner surface of the upper magnetic shoe. The magnetism of the outer surface of the lower spherical magnet is the same as that of the inner surface of the lower magnet shoe. A round through hole is formed in the center of the sphere. An inclined sleeve forming a rotating pair with the sphere is installed in the round through hole. The inclined sleeve is driven by a drive motor of the outside. Non-contact suspension of a motion part is achieved, the occurrence probability of hemolysis and thrombus and contamination to blood is reduced, performance is improved greatly, and the service life is greatly prolonged.

Description

technical field [0001] The invention relates to a ventricular auxiliary pump, in particular to a magnetic levitation ventricular auxiliary pump based on the principle of nutation and its application. Background technique [0002] Common ventricular assist pumps mainly include vane pumps and positive displacement pumps. The vane pump is a continuous flow pump that relies on the rotation of the impeller to drive the blood to achieve pressurization. It transfers energy to the liquid through the change of the fluid dynamic parameters. Due to the high-speed rotation of the vane pump, it will cause mechanical damage to blood cells, and will also have a great impact on hemolysis and thrombus. Most positive displacement pumps are composed of a variable volume cavity and a one-way valve. Through the change of volume, work is done on the liquid to increase its energy, and the blood reaches the required place by the action of the one-way valve. The disadvantages of this type of posit...

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Problems solved by technology

The disadvantages of this type of volumetric pump are that they are bulky, difficult to implant, susceptible to infection, vulnerable to damage to key components such as valves and membranes, and serious problems of thrombosis and hemolysis

For example, in the Chinese invention patent with the publication number CN103341220A, the support method of the partial displacement pump is supported by a ball pair. When it is used for ventricular assistance, the continuous working time of the moving parts is long, and the ball pair is prone to wear and tear, and the contact motion pair will also damage the pump. adverse effects of blood

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