Liquid levitation axial-flow type blood pump

Abstract

The invention relates to a special blood pump for a human body, in particular to a liquid levitation axial-flow type blood pump implanted into the human body in the biomedical engineering field. The liquid levitation axial-flow type blood pump is a pump-machine combination body. The liquid levitation axial-flow type blood pump is characterized in that annular magnetic steel wholly wrapped by a metal lantern ring is arranged on the outer circle of the rear segment of an impeller in a sleeved mode, the outer wall of the metal lantern ring is in the shape of an inclined spiral groove, a flow feeding opening is large, and a flow discharging opening is small; a flow passage in the pump is divided by the metal lantern ring into an inner flow passage and an outer flow passage, and the inner flow passage is the main flow passage; an axial magnetic pillar is embedded into the front segment of a hub of the impeller, an axial magnetic pillar is embedded in a hub of a front guide blade, the opposite magnetic poles of the two magnetic pillars are opposite, backward repulsive force is formed for the impeller, the repulsive force repels the blood forward pushing force which is borne by the impeller when the impeller rotates, the repulsive force and the blood forward pushing force increase and decrease at the same time, and when the repulsive force and the blood forward pushing force are balanced, axial magnetic levitation is achieved on the impeller; two pairs of sliding bearings have the radial and axial positioning function on the impeller 1 when the impeller is started, so that the impeller does not touch a wall and more stably enters a levitation state.

Description

technical field [0001] The invention relates to a special blood pump for the human body, in particular to a liquid magnetic levitation axial flow blood pump implanted in the human body in the field of biomedical engineering. Background technique [0002] At present, the few "heart assist blood pumps" approved for clinical application in the world are basically "axial flow blood pumps", such as the American HeartMate II, which occupies an absolute market sales volume, and Jarvik 2000, DeBake, Berlin Heart Incor, etc. are all axial flow pumps. flow blood pump. "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 pum...

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 closed-loop control system composed of a position sensor, a power amplifier, and a controller. Mechanical friction, long life of the pump, low mechanical hemolysis, but the pump system is complicated, with many blood flow dead ends, large area, more serious thrombus problem, and the pump is large in size and heavy in weight, which meets the strict requirements of implanting in the human body. against each other

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