Impeller, impeller manufacturing method and percutaneous blood pump

Abstract

The invention relates to the technical field of medical instruments, in particular to an impeller, an impeller manufacturing method and a percutaneous blood pump. The impeller comprises an impeller shaft and blades fixedly connected to the impeller shaft. Each blade has a closed profile and includes a skeleton and a blade face. The framework at least forms the outer contour of each blade. The outline of each blade is filled with the blade face, and the framework and the blade face are made of different materials. The framework is made of shape memory alloy, the rigidity of the blades is guaranteed, and therefore when the impeller rotates at a high speed, the blades are not prone to being scoured by blood to incline, the blade face can make full contact with the blood, and stable flow output of the impeller in the working process is guaranteed. On the other hand, the blade surface can be made to be very thin, and the blade has a small size after being compressed and can be easily compressed into a sheath.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to an impeller, a manufacturing method of the impeller and a percutaneous blood pump. Background technique [0002] In a method of treating heart disease, a percutaneous blood pump can be inserted between the left ventricle and the aortic arch to assist the pumping function of the heart. The percutaneous blood pump includes a sheath and an impeller located within the sheath. The blades of the impeller have a compressed state within the sheath and an extended state out of the sheath. When the blade is compressed, it is convenient to enter the human body. When the percutaneous blood pump operates, the blades spread out, pumping blood through the rotation of the impeller. The blade of the impeller of the traditional blood pump and the wheel shaft of the impeller are integrally formed by polymer materials, and the rigidity of the blade is insufficient. When the impeller rotat...

AI Technical Summary

Problems solved by technology

The blades of the impeller of the traditional blood pump and the shaft of the impeller are integrally formed by polymer materials. The rigidity of the blade is insufficient. When the impeller rotates at high speed, it is easy to be washed and tilted by the blood, and it cannot be guaranteed to be stable in a fixed position, which affects the actual use effect. , in order to improve the rigidity of the blade, we can only increase the thickness of the blade as much as possible. At present, the thickness of the blade is basically 0.51-0.64mm, but the too thick blade makes it difficult for the operator to compress the impeller into the sheath, so it is hoped that the reduce the thickness, therefore, these two problems have become a pair of contradictory bodies, puzzling those skilled in the art

Images