Heart auxiliary device of axial magnetic force unloading type axial flow pump

Abstract

The invention relates to a special axial flow pump, in particular to a heart auxiliary device of an axial magnetic force unloading type axial flow pump in the field of biomedical engineering. The heart auxiliary device is implanted into the human body. The auxiliary device is a pump-machine combination body and is composed of a pump system and a motor system. The heart auxiliary device is characterized in that an impeller position control soft magnet is installed at the rear end of a stator core, when an impeller moves forwards or backwards due to external force in a pump cylinder, the impeller position control soft magnet and the stator core generate magnetic constraining force on a permanent magnet rotor in an impeller hub, and the direction of force is opposite to the axial moving direction of the impeller. When the axial flow pump works, the magnetic constraining force can form partial and even whole axial magnetic force unloading on axial force loads of the impeller and a shaft, and axial magnetic levitation of the impeller is achieved. According to the heart auxiliary device of the axial magnetic force unloading device, mechanical abrasion and the friction heat effect can be reduced, the thrombus in the pump is prevented from being formed, complications are reduced, the service life of the axial flow pump is prolonged, and stability of continuous work is improved.

Description

technical field [0001] The invention relates to a special axial flow pump, in particular to an axial magnetic unloading type axial flow pump heart assist device implanted in the human body in the field of biomedical engineering. Background technique [0002] Various heart diseases can affect the pumping function of the heart when they develop to a certain stage, and the normal pumping function of the heart is essential for maintaining blood circulation in the human body. Insufficient pumping function of the heart is called "heart failure", and the treatment of severe heart failure is a difficult problem in clinical medicine at present. An effective treatment is to assist or replace a failing heart with an artificial mechanical blood pump, often called a "heart assist device" or "artificial heart." At present, some heart assist devices with better performance have been widely used clinically, but the application of heart assist devices also faces many problems, the main ones...

AI Technical Summary

Problems solved by technology

Although this kind of axial flow pump can remove the friction effect of mechanical bearings, due to the strict requirements of hydrodynamic suspension on parameters such as suspension gap and fluid viscosity, some technical performance of the pump needs to be sacrificed, and a technically optimized structure cannot be adopted. The blood pump is also difficult to achieve the ideal state of clinical needs

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