External magnetic suspension centrifugal blood pump with central magnetic pole structure

Abstract

The present invention provides an in vitro magnetic suspension centrifugal blood pump with a central magnetic pole structure, wherein a pump head comprises an impeller and a pump shell, a lower bottomplate of a cylindrical cavity at a lower part of the pump shell is recessed into a central cylindrical shell, and a central tube cavity is formed corresponding to a lower bottom plate outside of thepump shell; blades in the impeller are fixedly arranged on a base seat, the base seat is a cylindrical shell body and a tube section is arranged in the cylindrical shell body, and permanent magnets are fixedly arranged in annular cavities between the tube section and the shell body; the impeller sleeves on a central column shell; a section of a W-shaped secondary flow channel is arranged between the impeller base seat and the pump shell cylindrical cavity, and between the tube section and the central cylindrical shell; and a magnetic suspension device is arranged below the pump shell, stator soft iron in a magnetic suspension element comprises a central cylindrical soft iron and the pump shell central tube cavity is inserted into the central cylindrical soft iron to form a central magneticpole. The centrifugal blood pump can reduce thrombus and hemolysis and improve pump stability and operating efficiency.

Description

Technical field [0001] The present invention relates to the technical field of medical devices, in particular to a magnetic suspension centrifugal blood pump for short- and medium-term use outside the body of a patient, and in particular to a magnetic suspension centrifugal blood pump used for cardiac surgery and cannot be separated from the cardiopulmonary bypass (postoperative cardiogenic shock, congenital heart disease correction Postoperative pulmonary hypertension, post-heart transplantation support), difficult to correct low cardiac output, transition before heart transplantation, failure to achieve spontaneous circulation after cardiopulmonary resuscitation, etc., which require short- and medium-term ventricular assist pump intervention to maintain effective circulation , A non-implantable, external magnetic levitation centrifugal blood pump with a central magnetic pole structure to reduce cardiac work. Background technique [0002] Generally speaking, short and medium-ter...

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Problems solved by technology

[0004] The short-to-medium-term use of ventricular assist pumps in the prior art also has the problem of magnetic suspension control and blood damage caused by the vibration of the rotor impeller: the magnetic suspension rotor impeller in the pump head is unstable under the dynamic load formed by the impact of blood And there is vibration, the vibration will disturb the flow field in the pump, and then aggravate the occurrence of blood damage such as hemolysis in the pump. The unstable and unreliable suspension of the magnetic levitation rotor impeller is also prone to failures that the impeller hits the pump casing and causes the pump to stop.

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