Medical semi-maglev centrifugal pump based on steel ball

Abstract

The invention relates to a medical semi-maglev centrifugal pump based on a steel ball. The centrifugal pump comprises a motor, a driving magnet ring and a driven magnet ring, wherein the driving magnet ring is connected with a motor rotor, and the driven magnet ring is arranged in the manner of not making contact with the driving magnet ring and transmits torque through magnetic force. An isolation seal cartridge is arranged in an air gap between the driving magnet ring and the driven magnet ring. The driven magnet ring and an impeller rotor are fixedly connected together. The impeller rotor is supported through a driven side base in the radial direction and limited through the steel ball in the axial direction in a unidirectional mode. The impeller rotor presses against the steel ball through an upper ejecting block, the steel ball is arranged on the driven side base, and the lower end of the steel ball presses against a pump case base through a lower ejecting block. By the adoption of the technical scheme, compared with a general sliding bearing, mechanical friction contact is reduced, heat productivity is also reduced, and therefore the antithrombotic ability of a blood pump can be improved.

Description

technical field [0001] The invention belongs to the field of medical ultra-precision pumps, and in particular relates to a medical semi-magnetic levitation centrifugal pump based on steel balls. Background technique [0002] The application fields of medical centrifugal pumps mainly include extracorporeal circulation in cardiac surgery, ventricular assisted circulation, heart transplantation, extracorporeal membrane lung support, aortic surgery, liver and kidney transplantation, and extracorporeal circulation. In traditional centrifugal pumps, due to the friction at the seal of the rotor shaft, when the centrifugal pump is running at high speed, it will generate a lot of heat, which will easily lead to thrombus, and the stagnation of blood at the seal of the rotor shaft will also easily lead to thrombus. The sliding bearing used in the rotor has large mechanical friction contact and high calorific value, which is easy to cause thrombus. The present invention improves the abo...

AI Technical Summary

Problems solved by technology

In traditional centrifugal pumps, due to the friction at the seal of the rotor shaft, when the centrifugal pump is running at high speed, it will generate a lot of heat, which will easily lead to thrombus, and the stagnation of blood at the seal of the rotor shaft will also easily lead to thrombus. The sliding bearing used in the rotor has large mechanical friction contact and high calorific value, which is easy to cause thrombus. The present invention improves the above problems through steel spherical contact

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