Magnetic fluid suspension type centrifugal blood pump

Abstract

The invention relates to the technical field of medical instruments, especially to a magnetic fluid suspension type centrifugal blood pump. The magnetic fluid suspension type centrifugal blood pump can include an upper shell assembly which is provided with a lower opening, a lower shell assembly which is provided with an upper opening which is connected to the lower opening in a relative sealing manner to form a blood pump body structure with an accommodating chamber, a central cylinder assembly which is fixedly arranged in the accommodating chamber, and a rotor assembly which sleeves the central cylinder assembly, wherein at least a part of the upper surface of the rotor assembly is an inclined surface. The magnetic fluid suspension type centrifugal blood pump suspends the rotor assemblyby utilizing a magnetic bearing structure and a hydraulic bearing structure, thereby effectively avoiding hemolysis and thrombus caused by friction of a mechanical bearing. Moreover, restoring torquecan be provided by arranging the inclined surface on the rotor assembly, the axial suspension stability of the rotor assembly can be ensured without arranging a sensor, and so the structure is simpleand can be easily controlled.

Description

technical field [0001] The invention relates to the technical field of medical instruments, in particular to a magnetic liquid levitation centrifugal blood pump. Background technique [0002] As a ventricular assist device, an artificial blood pump (that is, an artificial heart blood pump) can replace or assist the heart to provide power for blood to pump arterial blood into the whole body. [0003] Rotary (vane type) blood pumps generally use mechanical bearings to carry the rotor, but the friction at the mechanical bearings and the high temperature generated by the friction will cause hemolysis and thrombus in the arteries, and the friction will also wear the mechanical bearings. Although the suspension rotary blood pump can be used to maintain the stability of the rotor by using magnetic force or hydraulic force, thereby avoiding hemolysis and thrombus caused by mechanical bearings. [0004] However, the current suspended rotary blood pump generally needs to install a se...

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Problems solved by technology

[0004] However, the current suspended rotary blood pump generally needs to install a sensor on the housing to detect whether the rotor is offset, and when the rotor is detected to be offset, it needs to be adjusted by changing the current of the suspension electromagnet, so that the blood pump actively The structure of the magnetic bearing is complicated, and the control is cumbersome. When the sensor fails, the rotor will not be able to levitate stably, thereby reducing the safety of the blood pump and even threatening the life of the patient.

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