Magnetic levitation centrifugal blood pump

Abstract

The application discloses a full magnetic suspension centrifugal blood pump, which comprises a pump shell, a rotor arranged in the pump shell, an impeller connected with the rotor, a driving motor, a radial magnetic suspension bearing, an axial permanent magnet assembly and an axial electromagnetic suspension bearing, the radial magnetic suspension bearing is used for driving the rotor to keep radial centering, the axial permanent magnet assembly comprises an upper magnetic ring and a lower magnetic ring, the upper magnetic ring is arranged in the pump shell, the lower magnetic ring is arranged on the impeller and has an attractive force with the upper magnetic ring, the axial electromagnetic suspension bearing comprises an axial suspension magnetic ring arranged on the impeller and a plurality of axial electromagnets arranged in the pump shell in a ring shape at equal intervals, and repulsion is generated between the axial electromagnets and the axial suspension magnetic ring when the axial electromagnets are electrified, so as to overcome the attractive force of the axial permanent magnet assembly on the impeller, and the rotor and the impeller are axially suspended. The full magnetic suspension centrifugal blood pump adopts electromagnetic suspension and permanent magnetic suspension to realize full suspension of the rotor and the impeller, has good suspension effect, and improves the safety and stability of the blood pump.

Description

Technical Field

[0001] This invention relates to the field of ventricular assist device technology, and in particular to a fully magnetically levitated centrifugal blood pump. Background Technology

[0002] The essence of an artificial heart is to replace the pumping function of the natural human heart with an artificial mechanical blood pump, providing a new approach to the treatment of patients with advanced heart failure. However, current artificial heart blood pumps have many shortcomings, and long-term implantation can lead to serious complications or mechanical failure, resulting in surgical failure. Good blood pump performance is therefore crucial for reducing complications. Consequently, continuous improvement of the safety and stability of mechanical blood pumps, and enhancement of their overall performance, are essential to make them more suitable for long-term implantation.

[0003] Complications resulting from prolonged implantation of mechanical blood pumps mainly include thromboembolism, bleeding, infection, pump wear, and blood component deterioration. Improvements in blood pump performance primarily aim to reduce the incidence and severity of these complications. Furthermore, the pump's size, weight, geometry, and other anatomically compatible characteristics, as well as its physical properties such as flow rate, pressure, and energy conversion efficiency, are also targets for improvement. Current application results indicate that centrifugal blood pumps with rotary impellers are the primary type, and for these pumps, bearing technology is one of the key factors.

[0004] Existing bearings mainly include sliding bearings, hydraulic bearings, and magnetic bearings. Sliding bearings suffer from mechanical wear and frictional heat, leading to serious complications in blood pumps, numerous mechanical failures, and short service life. Hydraulic bearings, due to high hydrodynamic pressure and significant shear forces, have a higher incidence of hemolysis, thrombosis, and stroke complications. While magnetic bearings can overcome the shortcomings of sliding and hydraulic bearings, traditional blood pumps using magnetic bearings often suffer from poor rotor and impeller levitation and instability. Therefore, improving the bearing performance of rotating impeller centrifugal blood pumps is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a fully magnetically levitated centrifugal blood pump, which can greatly improve the safety and stability of the blood pump, effectively reduce complications, and improve the overall performance of the blood pump.

[0006] The technical solution adopted by the present invention to solve its technical problem is: a fully magnetically levitated centrifugal blood pump, comprising: a pump housing and a rotor installed inside the pump housing;

[0007] The impeller is integrally connected to the rotor;

[0008] The drive motor, when energized, can drive the rotor and the impeller to rotate.

[0009] A radial magnetic suspension bearing is used to drive the rotor to keep radial centering;

[0010] An axial permanent magnetic assembly comprises an upper magnetic ring and a lower magnetic ring, the upper magnetic ring is built in the pump housing, the lower magnetic ring is installed on the impeller and oppositely arranged with the upper magnetic ring, and the polarity of the end of the lower magnetic ring close to the upper magnetic ring is opposite to that of the upper magnetic ring, so that the upper magnetic ring always has upward suction force to the impeller;

[0011] An axial electromagnetic suspension bearing comprises an axial suspension magnetic ring installed on the impeller and a plurality of axial electromagnets built in the pump housing in a ring shape and at equal intervals, the plurality of axial electromagnets are arranged along the axis of the rotor and oppositely arranged with the axial suspension magnetic ring.

[0012] When the plurality of axial electromagnets are energized, the axial electromagnets can generate an acting force with the axial suspension magnetic ring to overcome the suction force of the axial permanent magnetic assembly acting on the impeller, so that the rotor and the impeller are axially suspended.

[0013] As a further improvement of the present application, the axial electromagnetic suspension bearing further comprises a rear control circuit board and a plurality of rear distance sensors corresponding to the axial electromagnets, the axial electromagnets and the rear distance sensors are electrically connected to the rear control circuit board; the rear distance sensors are used to detect the magnetic field strength in the axial suspension gap between the impeller and the pump housing, and the rear control circuit board can control the current input to the axial electromagnets according to the detection signal fed back by the rear distance sensors.

[0014] As a further improvement of the present application, the impeller has a plurality of vertical vanes arranged in a radial shape and an impeller disc connected to the top of the plurality of vertical vanes; the impeller disc is annular and has a channel for blood flow between the impeller disc and the rotor; the lower magnetic ring and the axial suspension magnetic ring are both arranged in the impeller disc.

[0015] As a further improvement of the present application, the N-pole and S-pole of the upper magnetic ring, the lower magnetic ring and the axial suspension magnetic ring are arranged on the respective upper and lower two sides.

[0016] As a further improvement of the present application, the pump housing comprises a pump cavity and a pump barrel integrally connected to the top of the pump cavity, the pump barrel has a pump outer barrel and a central inner tube, the central inner tube is coaxially nested in the pump outer barrel and a containing space is formed therebetween, and the lower end of the central inner tube is communicated with the pump cavity.

[0017] The rotor is arranged in the central inner tube, and the impeller is arranged in the pump cavity.

[0018] As a further improvement of the present application, the radial magnetic suspension bearing comprises a radial magnetic column built in the upper part of the rotor and a plurality of radial electromagnets distributed in the accommodation space in the form of a ring, the radial electromagnets are arranged horizontally opposite to the radial magnetic column along the radial direction of the rotor.

[0019] The radial electromagnets can generate an attractive force between the radial magnetic column when energized.

[0020] As a further improvement of the present application, the radial magnetic suspension bearing further comprises a front control circuit board and a plurality of front distance sensors corresponding to the radial electromagnets, the radial electromagnets and the front distance sensors are electrically connected to the front control circuit board; the front distance sensors are used to detect the magnetic field strength in the radial suspension gap between the rotor and the central inner tube, and the front control circuit board can control the current input to the radial electromagnets according to the detection signals fed back by the front distance sensors.

[0021] As a further improvement of the present application, the outer ring of the radial magnetic column is N-pole and the inner ring is S-pole, or the outer ring of the radial magnetic column is S-pole and the inner ring is N-pole.

[0022] As a further improvement of the present application, the driving motor comprises a stator winding and a rotor magnetic steel, the rotor magnetic steel is built in the middle part of the rotor, and the stator winding is arranged in the accommodation space and opposite to the rotor magnetic steel.

[0023] As a further improvement of the present application, the full magnetic suspension centrifugal blood pump further comprises a magnetic shielding group distributed on the outer side of the upper and lower ends of the stator winding and the rotor magnetic steel.

[0024] The present application has the following advantages:

[0025] 1. The present application provides a full magnetic suspension centrifugal blood pump, which realizes the full suspension of the rotor and the impeller by electromagnetic suspension and permanent magnetic suspension, has good suspension effect, can greatly improve the safety and stability of the blood pump, has no mechanical bearing support, can prolong the service life of the blood pump, has fewer complications, and improves the overall performance of the blood pump.

[0026] 2. The radial suspension of the rotor is mainly supported by the electromagnetic suspension bearing, the suspension gap is large, the radial and axial suspension degrees of freedom of the rotor and the impeller are high, and the axial permanent magnetic assembly also has a radial positioning effect on the impeller, so that the stability is further improved.

[0027] 3. The present application can make the blood pump smaller without changing the fluid performance of the blood pump, and is more suitable for implantation. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1It is a profile structure schematic diagram of the full magnetic suspension centrifugal blood pump of the present application.

[0029] Figure 2 It is a structure schematic diagram of the radial electromagnet and front distance sensor of the radial magnetic suspension bearing in the present application distributed on the outer positioning ring.

[0030] Figure 3 It is a structure schematic diagram of the axial electromagnet and rear distance sensor of the axial magnetic suspension bearing in the present application distributed on the rear control circuit board.

[0031] Figure 4 It is a perspective view of the rotor and impeller in the present application.

[0032] The following description is made in conjunction with the drawings:

[0033] 1, pump housing; 101, pump cavity; 102, pump outer cylinder; 103, central inner tube;

[0034] 104, accommodating space; 2, rotor; 3, impeller; 301, vertical blade; 302, impeller disc; 4, driving motor; 401, stator winding; 402, rotor magnetic steel; 5, radial magnetic suspension bearing; 501, radial magnetic column; 502, radial electromagnet; 503, front control circuit board; 504, front distance sensor; 505, outer positioning ring; 6, axial permanent magnet assembly; 601, upper magnetic ring; 602, lower magnetic ring; 7, axial magnetic suspension bearing; 701, axial suspension magnetic ring; 702, axial electromagnet; 703, rear control circuit board; 704, rear distance sensor; 8, front magnetic shielding group; 801, front shielding inner ring; 802, front shielding outer ring; 9, rear magnetic shielding group; 901, rear shielding inner ring; 902, rear shielding outer ring. DETAILED DESCRIPTION

[0035] The following describes a preferred embodiment of the present application in conjunction with the drawings.

[0036] Reference Figures 1 to 4 The present application provides a full magnetic suspension centrifugal blood pump, comprising: a pump housing 1 and a rotor 2, an impeller 3, a driving motor 4, a radial magnetic suspension bearing 5, an axial permanent magnet assembly 6, an axial magnetic suspension bearing 7 and a magnetic shielding group installed inside the pump housing 1.

[0037] The pump housing 1 comprises a pump cavity 101 and a pump cylinder integrally connected to the top of the pump cavity 101, the pump cylinder has a pump outer cylinder 102 and a central inner tube 103, the central inner tube 103 is coaxially nested in the pump outer cylinder 102 and an accommodating space 104 is formed therebetween. The lower end of the central inner tube 103 is communicated with the pump cavity 101, and the upper end of the central inner tube 103 is a pump inlet for blood to flow into the blood pump. A pump outlet is provided on the radial side of the pump cavity 101 for blood to flow out of the blood pump.

[0038] Referring to Figure 1 and Figure 4 , the rotor 2 is a hollow circular tube, vertically placed inside the central inner tube 103. The impeller 3 is integrally welded at the lower end of the rotor 2 and placed in the pump cavity 101. The impeller 3 has a plurality of vertical blades 301 with curvature in a radial pattern and an impeller disc 302 fixedly connected at the top of the plurality of vertical blades 301. The impeller disc 302 is annular, sleeved on the outside of the rotor 2, and has a passage for blood flow between the impeller disc 302 and the rotor 2.

[0039] Optionally, the number of vertical blades 301 is 3-6.

[0040] Further, the driving motor 4 includes a stator winding 401 and a rotor magnetic steel 402. The rotor magnetic steel 402 is placed in the middle of the rotor 2 and connected as a whole with the rotor 2; the stator winding 401 is arranged in the accommodation space 104 between the pump outer cylinder 102 and the central inner tube 103 and arranged opposite to the rotor magnetic steel 402, so as to realize the integration of the driving motor 4 and the pump, forming a "pump-motor" integration. When the driving motor 4 is powered on, the stator winding 401 generates a magnetic field to drive the rotor magnetic steel 402 to rotate, and drive the rotor 2 and the impeller 3 to rotate synchronously, so that the liquid is sucked into the pump cavity 101 from the pump inlet, and is pushed out from the pump outlet under the action of the rotating centrifugal force of the impeller 3.

[0041] Referring to Figure 1 and Figure 2 , the radial magnetic suspension bearing 5 is at the upper part of the rotor 2 and the pump cylinder, which is an electromagnetic suspension bearing and can keep the rotor 2 radially centered after being powered on.

[0042] Specifically, the radial magnetic suspension bearing 5 includes a radial magnetic column 501, a plurality of radial electromagnets 502, a front control circuit board 503, a plurality of front distance sensors 504 and an outer positioning ring 505. The radial magnetic column 501 is placed in the upper part of the rotor 2, above the rotor magnetic steel 402. The plurality of radial electromagnets 502, the front control circuit board 503, the plurality of front distance sensors 504 and the outer positioning ring 505 are all arranged in the accommodation space 104 between the pump outer cylinder 102 and the central inner tube 103; the outer positioning ring 505 is fixed on the inner circumferential wall of the pump outer cylinder 102, and the plurality of radial electromagnets 502 and the plurality of front distance sensors 504 are annularly and equidistantly mounted on the inner circumferential wall of the outer positioning ring 505. And the plurality of radial electromagnets 502 are arranged along the radial direction of the rotor 2 and horizontally opposite to the radial magnetic column 501, that is, the cores of the plurality of radial electromagnets 502 are distributed in a radial pattern around the outside of the radial magnetic column 501.

[0043] In the embodiment, the radial magnetic column 501 is annular, the outer ring is N-pole and the inner ring is S-pole. The radial electromagnet 502 is magnetized after being electrified, and the iron core is magnetized as S-pole at one end of the radial magnetic column 501, thereby generating attractive force between the radial electromagnet 502 and the radial magnetic column 501, so that the rotor 2 is radially suspended and kept radially centered.

[0044] Of course, the outer ring of the radial magnetic column 501 can be set as S-pole and the outer ring as N-pole, in which case the current input to the radial electromagnet 502 needs to be reversed, and the same effect can be achieved.

[0045] Preferably, the number of radial electromagnets 502 is six or eight, and the number of front distance sensors 504 corresponding to the radial electromagnets 502 is six or eight. The front distance sensors 504 are all Hall sensors, which are arranged one by one on one side of the radial electromagnet 502, and are used to detect the magnetic field strength in the radial suspension gap between the rotor 2 and the center inner tube 103. The front control circuit board 503 is annular and is arranged at the bottom of the outer positioning ring 505. The radial electromagnet 502 and the front distance sensor 504 are both electrically connected to the front control circuit board 503. The front distance sensor 504 feeds back the detection signal to the front control circuit board 503, and the front control circuit board 503 controls the current size input to the radial electromagnet 502 according to the feedback detection signal, thereby changing the magnetic field strength of the radial electromagnet 502 and regulating the attractive force between the radial electromagnet 502 and the radial magnetic column 501, so as to adjust the position of the radial magnetic column 501 and ensure that the rotor 2 is radially suspended.

[0046] Referring to Figure 1 , the axial permanent magnet assembly 6 and the axial electromagnetic suspension bearing 7 are both located in the lower part of the pump cylinder and the impeller 3. The impeller 3 is suspended axially under the joint action of the axial permanent magnet assembly 6 and the axial electromagnetic suspension bearing 7.

[0047] Specifically, the axial permanent magnet assembly 6 includes an upper magnetic ring 601 and a lower magnetic ring 602. The upper magnetic ring 601 is built in the accommodation space 104 between the pump outer cylinder 102 and the center inner tube 103, and is located at the top of the upper cover of the pump cavity 101. The lower magnetic ring 602 is built in the outer ring of the impeller disc 302 and is opposite to the upper magnetic ring 601. The polarity of the end of the lower magnetic ring 602 close to the upper magnetic ring 601 is opposite, so that the upper magnetic ring 601 always has an upward attractive force on the impeller 3. When the blood pump is not working, the impeller disc 302 is upwardly abutted on the inner wall of the upper cover of the pump cavity 101 under the attractive force of the axial permanent magnet assembly 6.

[0048] The upper side end of the upper magnetic ring 601 and the lower magnetic ring 602 is S-pole, and the lower side end is N-pole; or the upper side end of the upper magnetic ring 601 and the lower magnetic ring 602 is N-pole, and the lower side end is S-pole.

[0049] Referring to Figure 1 and Figure 3 The axial electromagnetic suspension bearing 7 comprises an axial suspension magnetic ring 701, a plurality of axial electromagnets 702, a rear control circuit board 703 and a plurality of rear distance sensors 704. The axial suspension magnetic ring 701 is built into the inner ring of the impeller disc 302; the plurality of axial electromagnets 702, the rear control circuit board 703 and the plurality of rear distance sensors 704 are all built into the accommodation space 104 between the pump outer cylinder 102 and the central inner tube 103, and are located at the top of the upper cover of the pump cavity 101. The rear control circuit board 703 is annular, and the plurality of axial electromagnets 702 and the plurality of rear distance sensors 704 are annularly and equidistantly installed on the bottom of the rear control circuit board 703, and the plurality of axial electromagnets 702 are arranged along the axial direction of the rotor 2 and opposite to the axial suspension magnetic ring 701, that is, the cores of the plurality of axial electromagnets 702 are arranged above the axial suspension magnetic ring 701 along the axial direction of the rotor 2.

[0050] In this embodiment, the upper end of the axial suspension magnetic ring 701 is S-pole and the lower end is N-pole. After the axial electromagnets 702 are energized, the cores are magnetized, and the cores at one end of the axial suspension magnetic ring 701 are all magnetized to S-pole, thereby generating repulsion between the plurality of axial electromagnets 702 and the axial suspension magnetic ring 701 to overcome the attraction of the axial permanent magnet assembly 6 acting on the impeller 3, so that the rotor 2 and the impeller 3 are axially suspended.

[0051] Of course, the upper end of the axial suspension magnetic ring 701 is provided with N-pole and the lower end is provided with S-pole. At this time, the current input to the axial electromagnets 702 needs to be reversed, which can achieve the same effect.

[0052] Preferably, the number of axial electromagnets 702 is six or eight, and the number of rear distance sensors 704 corresponding to the axial electromagnets 702 is six or eight. The rear distance sensors 704 are also Hall sensors, which are arranged one by one on one side of the axial electromagnets 702 and are used to detect the magnetic field strength in the axial suspension gap between the impeller 3 and the upper cover of the pump cavity 101. The axial electromagnets 702 and the rear distance sensors 704 are all electrically connected to the rear control circuit board 703, the rear distance sensors 704 feed back detection signals to the rear control circuit board 703, and the rear control circuit board 703 controls the current size of the input axial electromagnets 702 according to the feedback detection signals, thereby changing the magnetic field strength of the axial electromagnets 702, adjusting the size of the repulsion between the axial electromagnets 702 and the axial suspension magnetic ring 701, and keeping the balance with the attraction generated by the axial permanent magnet assembly 6 to ensure that the rotor 2 and the impeller 3 are axially suspended.

[0053] As described above, the radial suspension of the rotor 2 combined with the axial suspension can realize omnidirectional control and suspension, thereby stably operating.

[0054] In addition, the axial permanent magnet assembly 6 also has a radial positioning effect on the impeller 3, and the impeller 3 is radially centered under the action of the attraction between the upper magnetic ring 601 and the lower magnetic ring 602.

[0055] With reference to the accompanying drawings Figure 1 The magnetic shielding group is distributed outside the upper and lower ends of the stator winding 401 and the rotor magnetic steel 402, and has a shielding effect. Specifically, the magnetic shielding group includes a front magnetic shielding group 8 and a rear magnetic shielding group 9. The front magnetic shielding group 8 is a double-layer front shielding inner ring 801 and a front shielding outer ring 802. The front shielding inner ring 801 is arranged in the rotor 2 and is located between the rotor magnetic steel 402 and the radial magnetic column 501. The front shielding outer ring 802 is arranged in the accommodation space 104 between the pump outer cylinder 102 and the center inner tube 103 and is located between the stator winding 401 and the front control circuit board 503. The rear magnetic shielding group 9 is a double-layer rear shielding inner ring 901 and a rear shielding outer ring 902. The rear shielding inner ring 901 is arranged in the rotor 2 and is close to the lower end of the rotor magnetic steel 402. The rear shielding outer ring 902 is arranged in the accommodation space 104 between the pump outer cylinder 102 and the center inner tube 103 and is located between the stator winding 401 and the rear control circuit board 703.

[0056] It can be seen that the full-magnetic suspension centrifugal blood pump of the application realizes full suspension of the rotor 2 and the impeller 3 by electromagnetic suspension and permanent magnetic suspension, has good suspension effect, can greatly improve the safety and stability of the blood pump, has no mechanical bearing support, can prolong the service life of the blood pump, has few complications, and improves the overall performance of the blood pump. The radial suspension of the rotor 2 is mainly supported by the electromagnetic suspension bearing, the suspension gap is large, the radial and axial suspension degrees of the rotor 2 and the impeller 3 are high, the axial permanent magnet assembly 6 also has a radial positioning effect on the impeller 3, and the stability is further improved. In addition, the blood pump can be made smaller without changing the fluid performance of the blood pump, and is more suitable for implantation.

[0057] In the above description, many specific details are set forth in order to provide a thorough understanding of the present application. However, the above description is only a preferred embodiment of the present application, and the present application can be implemented in many other ways different from those described herein, so the present application is not limited to the specific implementation disclosed above. Meanwhile, any person skilled in the art can make many possible changes and modifications to the technical solutions of the present application or modify them into equivalent embodiments with equivalent changes without departing from the scope of the technical solutions of the present application, by using the methods and technical contents disclosed above. Any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application, without departing from the scope of the technical solutions of the present application, still belongs to the protection scope of the technical solutions of the present application.

Claims

1. A fully magnetically levitated centrifugal blood pump, characterized in that The utility model relates to a pump, comprising: a pump housing (1) and a rotor (2) arranged inside the pump housing (1); an impeller (3) integrally connected with the rotor (2); a driving motor (4) capable of driving the rotor (2) and the impeller (3) to rotate when energized; a radial magnetic suspension bearing (5), the pump housing (1) comprises a pump cylinder having a pump outer cylinder (102) and a central inner tube (103), the central inner tube (103) is coaxially nested in the pump outer cylinder (102) and a containing space (104) is formed therebetween, the radial magnetic suspension bearing (5) comprises a radial magnetic column (501) arranged on the upper portion of the rotor (2) and a plurality of radial electromagnets (502) arranged in the containing space (104) in the form of a ring, the plurality of radial electromagnets (502) are arranged in the radial direction of the rotor (2) and horizontally opposite to the radial magnetic column (501), the plurality of radial electromagnets (502) can generate an attractive force between the radial magnetic column (501) when energized, for driving the rotor (2) to keep radial centering; an axial permanent magnet assembly (6) comprising an upper magnetic ring (601) and a lower magnetic ring (602), the upper magnetic ring (601) is arranged in the pump housing (1), the lower magnetic ring (602) is arranged on the impeller (3) and opposite to the upper magnetic ring (601) in the up-down direction, and the polarity of the end of the lower magnetic ring (602) close to the upper magnetic ring (601) is opposite to that of the upper magnetic ring (601), so that the upper magnetic ring (601) always has an upward attractive force on the impeller (3); an axial electromagnetic suspension bearing (7) comprising an axial suspension magnetic ring (701) arranged on the impeller (3), a plurality of axial electromagnets (702) arranged in the pump housing (1) in the form of a ring, a rear control circuit board (703), and a plurality of rear distance sensors (704) corresponding to the axial electromagnets (702), the plurality of axial electromagnets (702) are arranged in the axial direction of the rotor (2) and opposite to the axial suspension magnetic ring (701) in the up-down direction; the axial electromagnets (702) and the rear distance sensors (704) are electrically connected to the rear control circuit board (703); the rear distance sensors (704) are used for detecting the magnetic field intensity in the axial suspension gap between the impeller (3) and the pump housing (1), and the rear control circuit board (703) can control the current input to the axial electromagnets (702) according to the detection signals fed back by the rear distance sensors (704); wherein the plurality of axial electromagnets (702) can generate an acting force between the axial suspension magnetic ring (701) when energized, to overcome the attractive force of the axial permanent magnet assembly (6) acting on the impeller (3), so that the rotor (2) and the impeller (3) are axially suspended.

2. The fully magnetic levitation centrifugal blood pump of claim 1, wherein: The impeller (3) has a plurality of vertical blades (301) in a radial pattern and an impeller disc (302) connected to the top of the plurality of vertical blades (301); the impeller disc (302) is annular and has a channel for blood flow between the impeller disc (302) and the rotor (2); the lower magnetic ring (602) and the axial suspension magnetic ring (701) are both arranged in the impeller disc (302).

3. The fully magnetic levitation centrifugal blood pump of claim 1, wherein: The N and S poles of the upper magnetic ring (601), the lower magnetic ring (602) and the axial suspension magnetic ring (701) are arranged on the upper and lower sides of each, respectively.

4. The omni-magnetic levitation centrifugal blood pump of claim 1, wherein: The pump housing (1) further comprises a pump cavity (101), the pump cylinder is integrally connected to the top of the pump cavity (101), and the lower end of the central inner tube (103) is communicated with the pump cavity (101); the rotor (2) is arranged in the central inner tube (103), and the impeller (3) is arranged in the pump cavity (101).

5. The omni-magnetic levitation centrifugal blood pump of claim 1, wherein: The radial magnetic suspension bearing (5) further comprises a front control circuit board (503) and a plurality of front distance sensors (504) corresponding to the radial electromagnets (502) one by one; the radial electromagnets (502) and the front distance sensors (504) are both electrically connected to the front control circuit board (503); the front distance sensors (504) are used for detecting the magnetic field intensity in the radial suspension gap between the rotor (2) and the central inner tube (103), and the front control circuit board (503) can control the current input to the radial electromagnets (502) according to the detection signal fed back by the front distance sensors (504).

6. The omni-magnetic levitation centrifugal blood pump of claim 1, wherein: The outer ring of the radial magnetic column (501) is N-pole, and the inner ring is S-pole; or the outer ring of the radial magnetic column (501) is S-pole, and the inner ring is N-pole.

7. The omni-magnetic levitation centrifugal blood pump of claim 1, wherein: The driving motor (4) comprises a stator winding (401) and a rotor magnetic steel (402), the rotor magnetic steel (402) is arranged in the middle part of the rotor (2), and the stator winding (401) is arranged in the accommodating space (104) and opposite to the rotor magnetic steel (402).

8. The fully magnetic levitating centrifugal blood pump of claim 7, wherein: It further comprises a magnetic shielding group distributed on the outer side of the upper and lower ends of the stator winding (401) and the rotor magnetic steel (402).

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