A magnetic levitation axial flow blood pump

Abstract

The invention relates to a blood pump, specifically a magnetic suspension axial flow type blood pump implanted into the human body in the field of biomedical engineering. According to the magnetic suspension axial flow type blood pump, a pump is integrated with the machine; the magnetic suspension axial flow type blood pump is characterized in that convex and concave magnetic cones are respectively inlaid in ports of an impeller hub, a front guide impeller hub and a rear guide impeller hub, the magnetic cones are axial magnetic, the like magnetic poles are opposite, the magnetic cones are matched to form two pairs of permanent magnet suspension bearings, so that the impellers can completely suspend; two pairs of convex covers and concave covers are inlaid at the ports of the impellers, the front guide impeller hub and the rear guide impeller hub; the two airs of convex covers and concave covers are in clearance fit to form two pairs of sliding bearings, so that the impellers can be supported to stably enter into the suspension state, and the impellers and the magnetic bodies of the permanent magnet suspension bearings are protected, no direct friction, collision and corrosion is generated; two ends of a rotor magnetic steel in the impeller hub are provided with soft magnet rings which are used for shielding the magnetic field interference among the rotor magnetic steel, the front convex magnetic cone and the rear convex magnetic cone; impeller blades are variable pitch helical blades with two long blades and two short blades; a flow channel is of two inlets and four outlets, which is beneficial to improving the efficiency of the blood pump.

Description

technical field [0001] The invention relates to a special blood pump for the human body, in particular to a magnetic levitation axial flow blood pump implanted in the human body in the field of biomedical engineering. Background technique [0002] The currently known "axial flow blood pump" is smaller than the "centrifugal blood pump" and is easy to implant, so it occupies an absolute amount in clinical application. "Axial blood pump" is divided into "axial blood pump with shaft" and "suspended axial blood pump" according to whether there is mechanical bearing support. "Axial-flow blood pump with shaft" is prone to mechanical failure due to high-speed bearing wear, short life, and complications such as mechanical hemolysis and thrombus. "Suspended axial flow blood pump" is basically "active magnetic levitation axial flow blood pump", which is controlled by a complex closed-loop control system composed of position sensors, power amplifiers, and controllers. Although such blo...

AI Technical Summary

Problems solved by technology

"Axial-flow blood pump with shaft" is prone to mechanical failure due to high-speed bearing wear, short life, and complications such as mechanical hemolysis and thrombus

"Suspended axial flow blood pump" is basically "active magnetic levitation axial flow blood pump", which is controlled by a complex closed-loop control system composed of position sensors, power amplifiers, and controllers. Although such blood pumps do not have Bearings, no mechanical friction, long life of the pump, low mechanical hemolysis, but the pump system is complex, with many blood flow dead spots, large area, serious thrombus problem, and the volume and weight of the pump are smaller than that of "axial flow blood" The pump is large, which increases the difficulty of implantation

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