A heart-assisted axial flow blood pump

Abstract

The invention relates to a medical appliance, and particularly relates to an accessory axial-flow type blood pump for a heart which can be implanted into a human body and can be used for assisting the prostrated heart of a patient and supporting the heat of blood circulation. The accessory axial-flow type blood pump is composed of a pump system and a motor system, and is characterized in that the centers of the two ends of an impeller hub of the pump system are respectively embedded with a ball joint shaft and a ball-and-socket bearing, the hubs of the front and rear guide vanes are respectively embedded with a ball-and-socket bearing, a ball joint shaft for supporting a rotating impeller. When the impellers rotate, the impellers can be aligned freely in a radial direction, therefore, the mechanical friction and friction heating effect of 'shaft-bearing' can be greatly alleviated, the mechanical vibration of the impellers can be reduced, the service life and stability of the blood pump can be improved, and hemolysis, thrombus and other complications can be reduced; the blades of the impellers are in a varying pitch spiral shape, and the hubs are in an olive shape, therefore the streamline performance of the impellers is better; furthermore, rear guide vane varying pitch jaw type blades can effectively change blood pushed by the impeller from a rotational flow into a direct flow, therefore the working efficiency of the blood pump can be greatly improved.

Description

technical field [0001] The invention relates to a medical device, specifically a heart-assisted axial-flow blood pump that can be implanted into a human body to assist a patient's failing heart and support blood circulation. Background technique [0002] According to statistics from the World Health Organization, cardiovascular disease is the number one killer threatening human health, accounting for about 30% of global deaths each year. Cardiovascular disease culminates in "heart failure," the inability of the heart to pump blood. At present, the most effective ways to treat end-stage heart failure are "heart transplantation" and "artificial heart", but because of too few donors, "heart transplantation" has become a symbolic technology; The blood pump" becomes even more important. At present, "mechanical blood pump" has been widely used clinically, but clinical application is also facing many problems, mainly complications such as hemolysis and thrombus, and mechanical fa...

AI Technical Summary

Problems solved by technology

Since the machining accuracy and assembly accuracy are difficult to meet the strict concentric and coaxial high-precision requirements of the impeller and the front and rear guide vanes, there will be a situation where the "shaft-bearing" sliding friction force is large, and even the machine is locked. When the impeller rotates at high speed (generally working at 10,000-15,000 rpm), the "shaft-bearing" is mechanically worn by the acceleration, and mechanical failure is prone to occur, causing the blood pump to stop; and during the working process of the blood pump, as the " The wear of the shaft-bearing is accelerated, the temperature rise of the pump is increased, and the vibration and noise are increased, thus causing complications such as hemolysis and thrombus

[0005] The known axial flow blood pump also has an impeller support system using a magnetic levitation structure without mechanical bearings. Although this structure solves the problems of wear, vibration and heat generation, the pump has a long life, but due to the complexity of the magnetic levitation structure, the parts are bulky , there are more negative sides and dead ends of the blood flow, and the thrombus problem is more serious, which also affects the use effect of the pump

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