Magnetic suspension artificial heart pump structure of tangential magnetizing rotor integrated shaftless impeller

Abstract

The magnetic suspension artificial heart pump structure comprises the impeller and a plurality of independent blades which are connected to the inner side of the rotor at equal intervals and are of the same size and made of materials, and the blades are located in the center of the rotor but not connected to a main shaft. Integration of the impeller and the rotor and shaftless of the impeller are achieved, and a traditional center shaft driving type impeller is improved into a peripheral driving type impeller. The blades are connected to the inner side of the rotor shielding sleeve at equal intervals, shaftless is achieved, and therefore the blades and the rotor are integrated. According to the magnetic suspension artificial heart pump structure of the tangential magnetizing rotor integrated shaftless impeller, the size of a motor can be reduced, and transplantation is easy; meanwhile, the integrated structure can prevent blood from flowing through the air gap of the motor to the maximum extent, so that the conditions of hemolysis and thrombus are reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of medical equipment and magnetic suspension permanent magnet motors, and in particular relates to an artificial heart pump structure with an integrated structure of a shaftless impeller and a rotor. Background Art

[0002] According to annual data, the number of heart failure patients in my country increases year by year, but at the same time, the number of donors available for transplantation is seriously insufficient to cope with the huge number. In addition, some patients also face other clinical risks such as rejection reactions due to their own reasons. The emergence of artificial hearts can gradually narrow or even fill this gap, and has become an important way for heart failure patients to gain new life.

[0003] The current artificial heart has developed to the third generation - the magnetic levitation artificial heart pump. Since the rotor part is suspended in the pump body by electromagnetic force, there is no loss such as mechanical friction, thus avoiding blood contamination and other infections. The research and development of the third-generation artificial heart has brought the treatment of heart failure into a new milestone.

[0004] Artificial hearts are divided into centrifugal and axial flow types based on the different directions of blood in and out. In the centrifugal type, blood enters the pump body axially and leaves the pump body radially with the centrifugal force of the impeller, while in the axial flow type, blood enters the pump body axially and leaves the pump body axially with the action of the impeller. Compared with the axial flow type, the centrifugal type has a relatively wide blood flow gap, which can reduce the damage to blood cells and thus reduce the occurrence of hemolysis and thrombosis, but it cannot prevent blood from flowing through the motor air gap; and the axial flow type has a smaller volume than the centrifugal type, which reduces the difficulty of surgery to a certain extent and improves the comfort of the patient coexisting with the pump body. 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 integrated with a shaftless impeller. The integrated design of the impeller and the rotor can increase the blood gap of the heart pump and minimize the passage of blood through the air gap, thereby reducing damage to blood cells and the occurrence of hemolysis and thrombosis.

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

[0007] A magnetically suspended artificial heart pump structure with a tangentially magnetized rotor and an integrated shaftless impeller comprises an impeller and a plurality of independent blades of equal size and material connected to the inner side of the rotor at equal intervals. The blades are located at the center of the rotor but are not connected to the main shaft, thereby realizing the integration of the impeller and the rotor and the shaftless impeller, and improving the traditional central shaft driven impeller to a surrounding driven type.

[0008] As a preferred embodiment, the blades are connected to the inner side of the rotor shielding sleeve at equal intervals to achieve shaftless operation, thereby being integrated with the rotor.

[0009] As a preferred embodiment, a number of rotor permanent magnets of equal size are embedded on the outer surface of the rotor and arranged at equal intervals. The same magnetization method is adopted for each permanent magnet, that is, magnetization is performed 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 leading and trailing edge curves of the blade are both arc-shaped, and the sharp corners of the trailing edge of the blade have a certain degree of rounded corner design, which can effectively reduce the cutting damage to blood cells during the rotation of the blade. At the same time, the adjustable range of the blade angle is -2°, 0° and +2°.

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

[0012] As a preferred embodiment, a plurality of permanent magnets are embedded at equal intervals on the outer surface of the pump rotor, and magnetization is performed along the tangential direction of the center of each permanent magnet, and each permanent magnet has the same magnetization direction.

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

[0014] As a preferred embodiment, two sets of windings are integrated in the stator slots, namely a torque winding and a suspension winding for realizing motor rotation and suspension respectively.

[0015] As a preferred embodiment, in order to isolate the blood from the stator and rotor and to inhibit the blood from flowing through the air gap of the motor, shielding sleeves are installed on the stator and rotor of the motor respectively.

[0016] The present invention proposes a magnetic suspension artificial heart pump structure with a tangential magnetized rotor integrated with a shaftless impeller, which reasonably optimizes the blade parameters and the magnetic barrier of the permanent magnet, and can obtain a larger blood flow gap while obtaining a larger magnetic field, so that the shear stress is kept within a reasonable range, which has great practical significance for reducing hemolysis and thrombosis. Compared with the prior art, its advantages are:

[0017] The present invention adopts the above-mentioned tangential magnetized rotor integrated shaftless impeller magnetic suspension artificial heart pump structure to reduce the size of the motor and facilitate transplantation; 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The present invention is a schematic structural diagram of a shaftless impeller of a magnetically suspended artificial heart pump with a tangentially magnetized rotor and an integrated shaftless impeller.

[0019] Figure 2The structural schematic diagram of the permanent magnet of a magnetically suspended artificial heart pump with a tangentially magnetized rotor and an integrated shaftless impeller includes Figures (2a, 2b).

[0020] Figure 3 The overall structural schematic diagram of a magnetically suspended artificial heart pump with a tangentially magnetized rotor and an integrated shaftless impeller includes a diagram. DETAILED DESCRIPTION

[0021] The following is a detailed description of an embodiment of the present invention in conjunction with the accompanying drawings: This embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation method and a specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0022] like Figure 1 As shown, a magnetically suspended artificial heart pump structure with a tangentially magnetized rotor and an integrated shaftless impeller is shown, wherein the impeller blades are connected to the inner side of the rotor shielding sleeve at equal intervals, the blades have the same size and placement angle, and are made of titanium alloy material with good compatibility with blood.

[0023] 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 lines of each blade are formed by circular arcs or elliptical arcs, and the trailing edge of the blade is also rounded to reduce the shear damage to blood cells during the rotation of the impeller, further reducing the occurrence of hemolysis and thrombosis. At the same time, the blade angle can be adjusted in the range of -2°, 0° and +2°, and the number of independent blades ranges from five to seven.

[0024] like Figure 2 As shown, the rotor core is made of a number of laminations, and the rotor core is made of DW310 silicon steel material. Four permanent magnets are embedded in the surface of the rotor core along the circumferential direction. The tangential direction of the center of each permanent magnet is magnetized, and the magnetization direction is kept consistent. At the same time, the permanent magnet is divided into several sections along the direction parallel to the tangent line of the permanent magnet center, and a magnetic barrier space is left between each section of the permanent magnet. Figure 2 a and 2b are two different cutting methods.

[0025] like Figure 1-3 As shown, Figure 1 The shaftless impeller shown is connected to Figure 2 On the inner side of the rotor screen shown, each blade is placed independently, and there is no need for a rotating shaft to combine the blades, so the impeller is shaftless and the impeller becomes a four-way drive type. At the same time, due to the integration of the rotor and the impeller, the impeller and the rotor are integrated, which can further reduce the size of the motor.

[0026] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A magnetically suspended artificial heart pump structure with a tangentially magnetized rotor and an integrated shaftless impeller, characterized in that: It includes an impeller and a number of independent blades of equal size and material connected to the inner side of the rotor at equal intervals. The blades are located at the center of the rotor but are not connected to the main shaft, thereby realizing the integration of the impeller and the rotor and the shaftless impeller, and improving the traditional center-shaft driven impeller to a surrounding driven type.

2. The magnetic suspension artificial heart pump structure with a tangentially magnetized rotor and an integrated shaftless impeller according to claim 1, characterized in that: The blades are connected to the inner side of the rotor shield at equal intervals to achieve shaftless operation, thereby being integrated with the rotor.

3. The magnetic suspension artificial heart pump structure with a tangential magnetized rotor and an integrated shaftless impeller according to claim 1 is characterized in that: A number of rotor permanent magnets of equal size are embedded on the outer surface of the rotor and arranged at equal intervals. The same magnetization method is adopted for each permanent magnet, that is, magnetization is performed along the tangential direction of the center of the permanent magnet.

4. The magnetic suspension artificial heart pump structure with a tangentially magnetized rotor and an integrated shaftless impeller according to claim 1, characterized in that: 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 leading and trailing edge curves of the blade are both arc-shaped. The sharp corners of the trailing edge of the blade have a certain degree of rounded corner design, which can effectively reduce the cutting damage to blood cells during the rotation of the blade. At the same time, the blade angle can be adjusted in the range of -2°, 0° and +2°.

5. The magnetic suspension artificial heart pump structure with a tangentially magnetized rotor and an integrated shaftless impeller according to claim 1, characterized in that: The number of the blades is between five and seven.

6. The magnetic suspension artificial heart pump structure with tangential magnetized rotor and integrated shaftless impeller according to claim 1 is characterized in that: A plurality of permanent magnets are embedded at equal intervals on the outer surface of the pump body rotor, and magnetization is performed along the tangential direction of the center of each permanent magnet, and the magnetization direction of each permanent magnet is consistent.

7. The magnetic suspension artificial heart pump structure with a tangentially magnetized rotor and an integrated shaftless impeller according to claim 1 is characterized in that: 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 segmented permanent magnet.

8. The magnetic suspension artificial heart pump structure with a tangential magnetized rotor and an integrated shaftless impeller according to claim 1, characterized in that: Two sets of windings are integrated in the stator slots, one for torque winding and the other for suspension winding, which realize motor rotation and suspension respectively.

9. The magnetic suspension artificial heart pump structure with tangential magnetized rotor and integrated shaftless impeller according to claim 1, characterized in that: In order to isolate the blood from the stator and rotor and to inhibit the blood from flowing through the air gap of the motor, shielding sleeves are installed on the stator and rotor of the motor respectively.

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