Implantable shaftless heart pump based on gradual change of flow passage

Abstract

The invention relates to an implantable shaftless heart pump based on the gradual change of a flow passage. The implantable shaftless heart pump is characterized by comprising a flow passage inlet shell, a stator and a flow passage outlet shell, wherein the flow passage inlet shell, the stator and the flow passage outlet shell are sequentially and axially fixedly connected. The inner wall parts ofshell cavities of the flow passage inlet shell and the flow passage outlet shell are respectively provided with straight-through sections.The inner ports of the straight-through sections are respectively in transition connection with the outer ports of contraction sections, and the inner ports of the contraction sections are respectively arranged at the outer ports of the stator.Profile lines ofthe inner wall parts of the shell cavities of the flow passage inlet shell and the flow passage outlet shell are elliptical. The contraction sections of the inner diameters of the flow passage inlet shell and the flow passage outlet shell are arranged near one side of the stator. The inner wall of the stator is fixedly provided with a stator coil, the middle part of the stator coil is provided with an impeller rotor, and the impeller rotor is fixed through permanent magnetic suspension bearing shafts at two ends.The implantable shaftless heart pumphas the advantages of small volume, large flowand small heat productivity, and can effectively reduce the probability of thrombus formation.

Description

technical field [0001] The invention belongs to the technical field of fluid machinery and axial flow pumps, in particular to an implantable shaftless heart pump based on gradual change of flow path. Background technique [0002] The structures of the existing known vane heart pumps mainly include axial flow type and centrifugal type. In these two kinds of vane heart pumps, there is inevitably a gap between the tip of the vane and the inner wall of the flow channel, forming a large shear force. Damage red blood cells, resulting in adverse consequences such as coagulation and thrombus. For example, Chinese patent application CN 105169504A discloses a magnetic-fluid coupling passive suspension axial flow blood pump, which adopts a jujube core-shaped cross-sectional structure, has a small flow area between the inlet and outlet, and has a large contact area between the blood and the surface of the impeller and the inner wall of the flow channel. The volume of the impeller chamb...

AI Technical Summary

Problems solved by technology

[0002] The structures of the existing known vane heart pumps mainly include axial flow type and centrifugal type. In these two kinds of vane heart pumps, there is inevitably a gap between the tip of the vane and the inner wall of the flow channel, forming a large shear force. Damage red blood cells, causing adverse consequences such as coagulation and thrombus

For example, Chinese patent application CN 105169504A discloses a magnetic-fluid coupling passive suspension axial flow blood pump, which adopts a jujube core-shaped cross-sectional structure, has a small flow area between the inlet and outlet, and has a large contact area between the blood and the surface of the impeller and the inner wall of the flow channel. The volume of the impeller chamber is large, the heat generated by the blades is large, and it is easy to cause adverse consequences such as thrombus; Chinese patent application 201110366578.5 discloses a compact axial-flow magnetic levitation artificial heart pump. Although the structure is compact, the flow area is small and requires A higher motor speed can achieve the required blood flow and blood pressure. At a higher speed, the blood cells are more likely to be cut to pieces, which intensifies the symptoms of hemolysis and reduces the physiological function of the blood; at the same time, increasing the speed will bring about a large amount of heat. , high energy consumption and other issues

Images