A magnetic levitation mixed flow heart pump

Abstract

The invention relates to a magnetic levitation mixed flow heart pump, which comprises a pump body composed of an inlet part and a volute part, the pump body has a cavity, a rotatable rotor is arranged in the cavity, and axial flow blades and centrifugal blades are arranged on the outer peripheral surface of the rotor , the axial flow vane is located in the cavity of the inlet part, the centrifugal vane is located in the cavity of the volute part, the volute part is provided with a flow channel communicating with the cavity and the outer space of the volute part, and the tangential plane of the inflow end of the centrifugal vane It is set at an acute angle with the axis of the rotor, and the tangential plane of the outflow end is set parallel to the axis of the rotor, so that the centrifugal blades can gradually transition the flow of blood from the flow along the axis of the rotor to the flow along the radial direction of the rotor. The heart pump of the present invention combines the centrifugal Advantages of pumps and axial flow pumps.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to a magnetic levitation mixed flow heart pump. Background technique [0002] The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] Cardiovascular disease is the world's highest morbidity and leading cause of death. Heart failure is the ultimate outcome of all heart diseases, and there are two main treatments for middle and end-stage heart failure: heart transplantation and artificial heart pump. Due to the severe shortage of heart transplant donors, artificial heart pumps have become the main treatment for patients with heart failure. [0004] At present, there are two types of artificial heart pumps that are widely studied and used: axial flow pumps and centrifugal pumps. Among them, the advantages of the axial flow pump are large flow rate and small volume; the advantages of th...

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Problems solved by technology

The inventors found that the current implantable artificial heart pumps have the following disadvantages: 1) the existing axial flow pumps are mainly supported by mechanical bearings, and there are problems such as heating, lubrication, sealing, and wear at the bearings, which easily lead to thrombosis; 2) ) The rotational speed required by the axial flow pump is too high, which will generate high shear stress, which is easy to damage blood cells and cause severe hemolysis; 3) Compared with the axial flow pump, the centrifugal pump is larger in size, which is not convenient for implantation in smaller patients In vivo; 4) The speed gradient of the centrifugal pump is large, which is easy to cause damage to blood components

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