Centrifugal impeller for blood pump and blood pump

Abstract

The invention discloses a centrifugal impeller for a blood pump and the blood pump. The centrifugal impeller for the blood pump comprises a round bottom plate, and a through hole is formed in the middle of the bottom plate to form a secondary flow channel; the centrifugal blades are arranged on the upper surface of the bottom plate, each centrifugal blade is a banana-shaped blade with a thick middle part and two thin ends, the wrap angle of each centrifugal blade is greater than or equal to 90 degrees, and the centrifugal blades radially extend from the outer edge of the through hole to the periphery of the bottom plate. The supporting structure comprises a supporting shaft and a supporting blade, the supporting shaft is arranged in the center of the through hole, one end of the supporting blade is connected with the supporting shaft, and the other end of the supporting blade is connected with the bottom plate. According to the banana-shaped blade structure with the wrap angle larger than or equal to 90 degrees, blood damage and thrombus in the impeller can be reduced. The supporting structure is arranged in the through hole of the bottom plate and can support the centrifugal impeller to rotate at a high speed, the overall structural strength and stability are improved, the flow speed of blood in the secondary flow channel can be increased by arranging the supporting blades, thrombus is avoided, and the dynamic balance of the rotor is improved.

Description

technical field [0001] The invention relates to the technical field of rotors, in particular to a centrifugal impeller for a blood pump and a blood pump. Background technique [0002] A blood pump is a medical device that can assist human blood circulation, and is often used for extracorporeal circulation support and heart failure treatment. The blood pump is also an important component of the extracorporeal membrane oxygenation (Extracorporeal Membrane Oxygenation, ECMO) system. At present, the commonly used blood pump in clinical practice is the magnetic coupling driven blood pump. The magnetic coupling driving motor outside the pump head drives the centrifugal impeller inside the pump head to rotate to promote blood circulation. The high-speed rotation of the impeller of a centrifugal blood pump results in the appearance of turbulent flow in the impeller. The presence of these turbulences, on the one hand, affects the flow and reduces the hydraulic performance of the bl...

AI Technical Summary

Problems solved by technology

Above the center of the centrifugal impeller is usually the place where the main flow and the secondary flow collide, often resulting in a large energy loss and high non-physiological shear force, which will also lead to a decrease in the hydraulic performance of the blood pump

In addition, below the center of the centrifugal impeller, near the secondary flow channel, the blood flow rate is slow, making blood easily stagnant in the secondary flow channel area

The existence of non-physiological high shear force will inevitably cause damage to blood cells and proteins (such as destroying red blood cells and activating platelets, etc.), while the existence of stagnant flow areas will lead to blood stasis, which will further lead to the formation of thrombus

What's more serious is that once a thrombus occurs at the bearing, it is easy to destroy the dynamic balance, resulting in the instability of the rotor, which in turn leads to the failure of the blood pump, which may lead to serious clinical accidents

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