A magnetic suspension artificial heart pump structure of tangential magnetization rotor integrated with shaftless impeller

Abstract

The application discloses a kind of tangential magnetization rotor integrated shaftless impeller's magnetic suspension artificial heart pump structure, including impeller and several equidistantly connected independent blades of equal size and material in rotor inside, the blade is located in rotor center, but not connected on main shaft, realize the integration of impeller and rotor and the shaftless of impeller, improve traditional central shaft driven impeller to four peripheral driving type.Blade equidistantly connects in rotor shield sleeve inside, realizes shaftless, to be integrated with rotor in one body.The application adopts above-mentioned tangential magnetization rotor integrated shaftless impeller's magnetic suspension artificial heart pump structure and can reduce motor volume, easy to transplant;Meanwhile, the integrated structure can prevent blood from flowing through motor air gap to the maximum, to reduce the situation of hemolysis and thrombosis.

Description

Technical Field

[0001] This invention belongs to the field of medical device and magnetic levitation permanent magnet motor technology, specifically relating to an artificial heart pump structure with an integrated structure of shaftless impeller and rotor. Background Technology

[0002] According to annual data, the number of heart failure patients in my country is increasing year by year. However, the number of available transplant donors is severely insufficient to cope with the huge number of patients. In addition, some patients face other clinical risks such as rejection due to their own reasons. The emergence of artificial hearts can gradually reduce or even make up for this gap, becoming an important way for heart failure patients to get a new lease on life.

[0003] The current artificial heart has developed to the third generation – the magnetically levitated artificial heart pump. Since the rotor is suspended in the pump body by electromagnetic force, there is no mechanical friction or other losses, thus avoiding blood contamination and other infections. The development of the third-generation artificial heart has brought the treatment of heart failure to a new level.

[0004] Artificial hearts are classified into centrifugal and axial flow types based on the direction of blood flow. In a centrifugal heart, blood enters the pump body axially and exits radially due to the centrifugal force of the impeller. In an axial flow heart, blood enters the pump body axially and exits axially due to the impeller's action. Compared to axial flow hearts, centrifugal hearts have a relatively wider blood flow gap, which reduces damage to blood cells and thus reduces hemolysis and thrombosis. However, blood cannot be prevented from flowing through the motor air gap. Axial flow hearts, on the other hand, have a smaller volume than centrifugal hearts, which reduces the difficulty of surgery to some extent and improves the comfort of the patient coexisting with the pump. Summary of the Invention

[0005] In view of this, the present invention aims to propose a magnetically levitated artificial heart pump structure with a tangentially magnetized rotor and an integrated shaftless impeller. The integrated design of the impeller and rotor can increase the blood gap of the heart pump and minimize the passage of blood through the air gap, thereby reducing the damage to blood cells and the occurrence of hemolysis and thrombosis.

[0006] To achieve the above objectives, the implementation scheme of the present invention is as follows:

[0007] A magnetic levitation artificial heart pump structure with a tangentially magnetized rotor and an integrated shaftless impeller includes an impeller and several independent blades of the same size and material that are equally spaced and connected to the inner side of the rotor. The blades are located at the center of the rotor but are not connected to the main shaft, thereby achieving the integration of the impeller and the rotor and the shaftlessness of the impeller, and improving the traditional central shaft driven impeller to a four-sided driven type.

[0008] In a preferred embodiment, the blades are connected at equal intervals to the inside of the rotor shielding sleeve, achieving shaftless operation and thus integrating with the rotor as one unit.

[0009] In a preferred embodiment, several rotor permanent magnets of equal size are embedded on the outer surface of the rotor and arranged at equal intervals. Each permanent magnet is magnetized in the same way, that is, magnetized along the tangential direction of the center of the permanent magnet.

[0010] As a preferred embodiment, the width of the leading edge of the blade is 1.5-2 times greater than the width of the trailing edge of the blade. The edge of the blade connected to the inner side of the rotor is defined as the leading edge of the impeller. The curves of the leading and trailing edges of the blade are both arc-shaped. The sharp corner of the trailing edge of the blade has a certain degree of rounded corner design, which can effectively reduce the cutting and damage to blood cells during the rotation of the blade. At the same time, the blade angle is adjustable in the range of -2°, 0° and +2°.

[0011] In a preferred embodiment, the number of blades is five to seven.

[0012] In a preferred embodiment, several permanent magnets are embedded at equal intervals on the outer surface of the pump rotor, and each permanent magnet is magnetized along the tangential direction of its center, with each permanent magnet being magnetized in the same direction.

[0013] In a preferred embodiment, each permanent magnet is divided into several segments along a direction parallel to its central tangent, and a certain magnetic barrier space is left between each segment of permanent magnet.

[0014] In a preferred embodiment, two sets of windings are integrated in the stator slot, which are respectively the torque windings for motor rotation and suspension, and the suspension windings.

[0015] In a preferred embodiment, shielding sleeves are installed on the motor stator and rotor to isolate blood from the stator and rotor and to inhibit blood flow through the motor air gap.

[0016] This invention proposes a magnetically levitated artificial heart pump structure with a tangentially magnetized rotor and an integrated shaftless impeller. By rationally optimizing blade parameters and the magnetic barrier of the permanent magnet, a large blood flow gap can be obtained while simultaneously achieving a large magnetic field, keeping shear stress within a reasonable range. This has significant practical value in reducing hemolysis and thrombosis. Compared with existing technologies, its advantages are:

[0017] The present invention adopts the above-mentioned tangential magnetized rotor integrated shaftless impeller magnetic levitation artificial heart pump structure, which can reduce the motor volume and is easy to transplant; at the same time, the integrated structure can prevent blood from flowing through the motor air gap to the greatest extent, thereby reducing the occurrence of hemolysis and thrombosis. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the shaftless impeller of a magnetically levitated artificial heart pump with an integrated tangentially magnetized rotor.

[0019] Figure 2The schematic diagram of the permanent magnet of a magnetically levitated artificial heart pump with a tangentially magnetized rotor integrated with a shaftless impeller is shown in Figures (2a and 2b).

[0020] Figure 3 This is a schematic diagram of the overall structure of a magnetically levitated artificial heart pump with a tangentially magnetized rotor and an integrated shaftless impeller, including the figure shown. Detailed Implementation

[0021] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings: These embodiments are implemented based on the technical solution of the present invention, and provide detailed implementation methods and specific operation processes, but the protection scope of the present invention is not limited to the following embodiments.

[0022] like Figure 1 As shown, a magnetic levitation artificial heart pump structure with a tangentially magnetized rotor and an integrated shaftless impeller is disclosed. The impeller blades are connected at equal intervals inside the rotor shielding sleeve. The size and placement angle of each blade are consistent, and the impeller is made of titanium alloy material that is compatible with blood.

[0023] The leading edge width of the blade is 1.5-2 times greater than the trailing edge width. The edges of each blade are formed by rounded or elliptical arcs, and the trailing edge is also rounded to reduce shearing damage to blood cells during impeller rotation, further minimizing hemolysis and thrombosis. The blade angle is adjustable within the range of -2°, 0°, and +2°, and the number of individual blades varies from five to seven.

[0024] like Figure 2 As shown, the rotor core is made of several laminations stacked together. The rotor core is made of DW310 silicon steel. Four permanent magnets are embedded in the circumferential direction on the surface of the rotor core. Each permanent magnet is magnetized tangentially at its center, and the magnetization direction is kept consistent. At the same time, the permanent magnets are divided into several segments along a direction parallel to the tangent at the center of the permanent magnets, with magnetic barrier spaces left between each segment. Figure 2 a and 2b represent two different cutting methods.

[0025] like Figure 1-3 As shown, Figure 1 The shaftless impeller shown is connected to Figure 2 As shown, each blade is independently mounted inside the rotor panel, eliminating the need for a shaft to assemble the blades. This achieves shaftless impeller operation, transforming it into a four-sided driven type. Furthermore, the integration of the rotor and impeller further reduces the motor's size.

[0026] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A magnetically levitated artificial heart pump structure with a tangentially magnetized rotor and an integrated shaftless impeller, characterized in that, It includes an impeller and several independent blades of the same size and material that are equally spaced and connected to the inside of the rotor. The blades are located at the center of the rotor but are not connected to the main shaft, thus realizing the integration of the impeller and the rotor and the shaftless design of the impeller, and improving the traditional central shaft driven impeller to a four-sided driven type. The blades are connected at equal intervals inside the rotor shielding sleeve, achieving shaftless design and thus integrating with the rotor as one unit; Several rotor permanent magnets of equal size are embedded on the outer surface of the rotor and are arranged at equal intervals. Each permanent magnet is magnetized in the same way, that is, it is magnetized along the tangential direction of the center of the permanent magnet. The width of the leading edge of the blade is 1.5-2 times greater than the width of the trailing edge of the blade. The edge of the blade connected to the inner side of the rotor is defined as the leading edge of the impeller. The curves of both the leading and trailing edges of the blade are arc-shaped. The sharp corner of the trailing edge of the blade has a certain degree of rounded corner design, which can effectively reduce the cutting and damage to blood cells during the rotation of the blade. At the same time, the blade angle is adjustable in the range of -2°, 0° and +2°. Several permanent magnets are embedded at equal intervals on the outer surface of the pump body rotor. Each permanent magnet is magnetized along the tangential direction of its center, and the magnetization direction of each permanent magnet is consistent. Each permanent magnet is divided into several segments along a direction parallel to its central tangent, and a certain magnetic barrier space is left between each segment of permanent magnet. The stator slots integrate two sets of windings, which are the torque windings for motor rotation and suspension, and the suspension winding, respectively. To isolate blood from the stator and rotor, and to inhibit blood flow through the motor air gap, shielding sleeves are installed on the motor stator and rotor respectively.

2. The magnetic levitation artificial heart pump structure with tangentially magnetized rotor integrated shaftless impeller according to claim 1, characterized in that, The number of blades is between five and seven.

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