AU2021105777A4

AU2021105777A4 - Magnetically Levitated Nutation Artificial Heart Pump and Its System

Info

Publication number: AU2021105777A4
Application number: AU2021105777A
Authority: AU
Inventors: Gang Chen; Jiaxin DING; Gaosong Li; Zhenya WANG; Zetong Xie; Ligang YAO
Original assignee: Fuzhou University
Current assignee: Fuzhou University
Priority date: 2021-08-18
Filing date: 2021-08-18
Publication date: 2021-10-21
Anticipated expiration: 2029-08-18

Abstract

The invention relates to a magnetically levitated nutation artificial heart pump, comprising an upper cover, a lower cover, an annular housing, a nutation mechanism and a levitation detection mechanism; the nutation mechanism divides an accommodation chamber into a first chamber and a second chamber, the nutation mechanism includes a nutating disk and a driving magnet, and the levitation detection mechanism includes: a magnet ball pair, including a first hemispherical magnet and a second hemispherical magnet; a levitation magnet assembly, including a first levitation magnet and a second levitation magnet; the levitation magnet and the first hemispherical magnet have the same magnetic properties, and the second levitation magnet and the second hemispherical magnet have the same magnetic properties so that the magnet ball pair is suspended in the accommodation chamber; and an eddy current sensor, which has a preset distance from the first hemispherical magnet gap; the eddy current sensor obtains the actual gap between it and the magnet ball pair by obtaining the impedance value generated between it and the first hemispherical magnet after power-on, so as to obtain the levitation state of the magnet ball pair. The invention also provides a magnetically levitated nutation artificial heart pump system. 1/3 FIGURES 222 21 <22 51 52 7 8 5 Figure 1

Description

1/3

FIGURES

222 21 <22

51 52 7 8 5 Figure 1

Magnetically Levitated Nutation Artificial Heart Pump and Its System

TECHNICAL FIELD

The invention relates to the technical field of magnetically levitated artificial heart pump,

and relates to a magnetically levitated nutation artificial heart pump and a system thereof.

BACKGROUND

Artificial heart pump is a small pump with variable speed and variable capacity used to

completely replace the work of the heart. According to the working principle of blood

pump, it is divided into axial flow blood pump and centrifugal blood pump. The

disadvantages of centrifugal blood pump are large volume and complex structure. It is not

easy to be implanted in the body; there must be a pipeline to connect the body and the

outside, which is susceptible to infection, mechanical fatigue in contact, large abrasion,

short life, and need lubrication, etc. The axial flow blood pump rotates at a high speed

when it is working, and the blades will damage the blood components, leading to

hemolysis and thrombus formation, and it is difficult to seal for a long time.

Magnetica levitation has the advantages of non-contact, non-friction, non-lubrication and

high precision. It satisfies the various demanding requirements of artificial hearts. It can

solve the problems such as the damage to blood cells caused by the crushing of the

bearing on the blood in the traditional bearing-supported artificial heart design and the

sealing of the bearing and other issues. However, the levitation distance of the

magnetically levitated artificial heart pump is very small, which is difficult to observe

with the naked eye, and the observation angle is not easy to find. In view of this, the

inventor proposed the present invention.

SUMMARY

In order to solve the problems above, the present invention provides a magnetically

levitated nutation artificial heart pump.

First, a magnetically levitated nutation artificial heart pump, comprising an upper cover, a

lower cover, an annular housing sandwiched between the upper cover and the lower

cover to form an accommodation chamber, and a nutation mechanism; the upper cover is

provided with a first through port and a second through port connecting with the

accommodation chamber; the nutation mechanism divides the accommodation chamber

into a first chamber connecting with the first through port and a second chamber

connecting with the second through port; the nutation mechanism includes a nutating disk

and a driving magnet; the nutating disk swings relative to the accommodation chamber to

change the size of the first chamber and the second chamber; it also includes a levitation

detection mechanism, and the levitation detection mechanism includes the magnet ball

pair, including a first hemispherical magnet arranged on the upper side of the nutating

disk and a second hemispherical magnet arranged on the lower side of the nutating disk;

the levitation magnet assembly, includes a first levitation magnet disposed on the upper

cover and a second levitation magnet disposed on the lower cover; the first levitation

magnet and the first hemispherical magnet have the same magnetic properties, and the

second levitation magnet and the second hemispherical magnet have the same magnetic

properties so that the magnet ball pair is suspended in the accommodation chamber; and

the eddy current sensor, penetrating the upper cover and has a preset gap from the first

hemispherical magnet when the magnet ball pair is suspended; the eddy current sensor

obtains the actual gap between the eddy current sensor and the magnet ball pair by obtaining the impedance value generated between it and the first hemispherical magnet after power-on, so as to obtain the levitation state of the magnet ball pair.

Preferably, the driving magnet comprises an annular electromagnet arranged on the outer

periphery of the annular housing, which has the first magnet and the second magnet; the

first magnet and the second magnet are arranged sequentially and alternately along the

circumferential direction; the first magnet is arranged above the second magnet for

attracting nutating disk to swing upward when energized and attracting the nutating disk

to swing downward when the second magnet is energized.

Preferably, one of the first magnet and the second magnet is arranged as the other of the

first magnet and the second magnet at a position opposite to each other along the

circumferential direction of the annular electromagnet.

Preferably, along the circumferential direction of the annular electromagnet, the first

magnet and the second magnet can be energized in order to attract the nutating disk to

swing in order along the circumference, thus making the nutating disk move.

Preferably, the upper cover has a lower conical surface; the lower cover has an upper

conical surface; the upper and lower walls of the accommodation chamber are composed

of the partial spherical surface, the lower conical surface, and the upper conical surface of

the first hemispherical magnet and the second hemispherical magnet; the upper surface

and the lower surface of the nutating disk are in line contact with the lower conical

surface and the upper conical surface respectively, so as to divide the accommodation

chamber into a first chamber and a second chamber.

Preferably, the inner peripheral wall of the annular housing has an arc part to abut against

the nutating disk when the nutating disk swings up and down.

Preferably, the first hemispherical magnet comprises a first hemispherical shell and a first

annular magnetic member arranged in the hemispherical shell; the second hemispherical

magnet includes a second hemispherical shell and a second annular magnetic member

arranged in the second hemispherical shell; the upper cover is provided with a third

annular magnetic member arranged opposite to the same pole as the first annular

magnetic member; The lower cover is provided with a fourth annular magnetic member

which is opposite to the second annular magnetic member at the same pole;

Second, the present invention also provides a magnetically levitated nutation artificial

heart pump system, comprising any of the above magnetically levitated nutation artificial

heart pump and a control device electrically connected to the eddy current sensor and the

drive magnet, respectively; the control device includes a processor, a memory, and a

computer program that is stored in the memory and can run on the processor, and the

processor implements the following steps when the processor executes the computer

program: the first magnet and the second magnet are sequentially energized at a preset

frequency in a clockwise or counter clockwise direction, so that the nutating disk swings

up and down at the preset frequency in a clockwise or counter clockwise direction.

Preferably, the first magnet and the second magnet are energized in a clockwise direction

or counter clockwise at a preset frequency in sequence, including: one of the first magnet

and the second magnet at the opposite positions of the annular electromagnet in the

circumferential direction is simultaneously energized, so that the nutating disk is

maintained inclined with respect to the accommodation chamber.

By adopting the technical scheme, the invention can achieve the following technical

effects:

The magnetically levitated nutation artificial heart pump provided by the invention

comprises an eddy current sensor; a high-frequency electromagnetic field is generated

around the sensor coil after a high-frequency current is introduced into the sensor coil,

and when the high-frequency electromagnetic field passes through the first hemispherical

magnet close to it, an eddy current is induced in thefirst hemispherical magnet, and the

induced eddy current generates an eddy current magnetic field around it, the direction of

which is opposite to that of the original high-frequency electromagnetic field; the

impedance value of sensor coil will be changed after superposition of high-frequency

electromagnetic field and eddy current magnetic field, which is directly related to the

distance between sensor coil and the first hemispherical magnet. By detecting the

impedance value of sensor coil, the distance between sensor coil and the first

hemispherical magnet can be measured, so as to judge whether the nutating disk is in

levitation state against gravity, that is, to obtain the levitation state of the magnet ball

pair.

BRIEF DESCRIPTION OF THE FIGURES

Figure 1 is a schematic structural diagram of a magnetically levitated nutation artificial

heart pump of the present invention.

Figure 2 is an exploded structure diagram of the magnetically levitated nutation artificial

heart pump of the present invention.

Figure 3 is a schematic sectional structure diagram of the magnetically levitated nutation

artificial heart pump of the present invention.

Figure 4 is a schematic structural diagram of the nutating disk matched with the upper

cone and the lower cone.

Drawing identification

1. eddy current sensor; 2. upper cover; 21. the first through port; 22. the second through

port; 23. lower conical surface; 31. the third annular magnetic member; 32. the fourth

annular magnetic member; 4. magnet ball pair; 41. the first hemispherical shell; 42.

second hemispherical shell; 43. a first annular magnetic member; 44. second annular

magnetic member; 5. annular electromagnet; 51. first magnet; 52. second magnet; 6.

nutating disk; 7. annular housing; 8. lower cover; 81. upper conical surface.

DESCRIPTION OF THE INVENTION

In order to make the purpose, technical scheme and advantages of the embodiments of the

present invention clearer, the technical scheme of the embodiments of the present

invention will be described clearly and completely with reference to the drawings in the

embodiments of the present invention. Obviously, the described embodiments are part of

the embodiments of the present invention, not all of them. Based on the embodiments of

the present invention, all other embodiments obtained by ordinary technicians in the field

without creative labor belong to the scope of protection of the present invention.

Therefore, the following detailed description of the embodiments of the present invention

provided in the drawings is not intended to limit the scope of the claimed invention, but

only represents selected embodiments of the present invention.

In the description of the present invention, it should be understood that the terms

"center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower",

"front", "rear", "left", "right", "vertical" and "horizontal" are only for the convenience of

describing the invention and simplifying the description, and do not indicate or imply that the referred equipment or elements must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as limiting the invention.

In the present invention, unless otherwise specified and limited, the first feature on or

under the second feature may include direct contact between the first and second features,

or may include contact between the first and second features instead of direct contact.

Furthermore, the first feature "on", "above" and "up" the second feature includes that the

first feature is directly above and obliquely above the second feature, or simply indicates

that the first feature is higher in horizontal height than the second feature. The fact that

the first feature is "under", "below" and "down" the second feature includes that the first

feature is directly below and obliquely below the second feature, or simply means that the

first feature is smaller in horizontal height than the second feature.

A first embodiment of the present invention provides a magnetically levitated nutation

artificial heart pump, referring to Figure 1 and 2. Magnetically levitated nutation artificial

heart pump comprises an upper cover 2, a lower cover 8, an annular housing 7

sandwiched between the upper cover 2 and the lower cover 8 to form an accommodation

chamber, and a nutation mechanism. The upper cover 2 is provided with a first through

port 21 and a second through port 22 connecting with the accommodation chamber; the

nutation mechanism divides the accommodation chamber into a first chamber connecting

with the first through port 21 and a second chamber connecting with the second through

port 22. The nutation mechanism includes a nutating disk 6 and a driving magnet; the

nutating disk 6 swings relative to the accommodation chamber to change the size of the

first chamber and the second chamber; the driving magnet is used for driving the nutating

plate 6 to make nutating motion. Magnetically levitated nutation artificial heart pump also includes a levitation detection mechanism, and the levitation detection mechanism includes the magnet ball pair 4, the levitation magnet assembly and the eddy current sensor 1. Magnet ball pair 4 includes a first hemispherical magnet arranged on the upper side of the nutating disk 6 and a second hemispherical magnet arranged on the lower side of the nutating disk 6.The levitation magnet assembly includes a first levitation magnet disposed on the upper cover 2 and a second levitation magnet disposed on the lower cover 8; the first levitation magnet and the first hemispherical magnet have the same magnetic properties, and the second levitation magnet and the second hemispherical magnet have the same magnetic properties so that the magnet ball pair 4 is suspended in the accommodation chamber, that is, the nutating disk 6 is suspended in the accommodation chamber. When the eddy current sensor 1 penetrates the upper cover 2, it has a preset gap from the first hemispherical magnet when the magnet ball pair is suspended; the eddy current sensor 1 obtains the its actual gap with the magnet ball pair by obtaining the impedance value generated between it and the first hemispherical magnet after power-on, so as to obtain the levitation state of the magnet ball pair.

Specifically, in the first embodiment, the eddy current sensor 1 consists of a probe and a

probe shell, wherein the probe consists of a sensor coil, a head, a shell, a high-frequency

cable and a high-frequency connector, and the probe shell is used for connecting and

fixing the probe head and serving as a clamping structure for the probe. The probe shell is

engraved with external threads for mounting in the threaded holes of the upper cover 2.

The working principle of the eddy current sensor is as follows: a high-frequency

electromagnetic field is generated around the sensor coil after a high-frequency current is

introduced into the sensor coil, and when the high-frequency electromagnetic field passes through the first hemispherical magnet close to it, an eddy current is induced in the first hemispherical magnet, and the induced eddy current generates an eddy current magnetic field around it, the direction of which is opposite to that of the original high-frequency electromagnetic field; the impedance value of sensor coil will be changed after superposition of high-frequency electromagnetic field and eddy current magnetic field, which is directly related to the distance between sensor coil and the first hemispherical magnet. By detecting the impedance value of sensor coil, the distance between sensor coil and the first hemispherical magnet can be measured, so as to judge whether the nutating disk is in levitation state against gravity, that is, to obtain the levitation state of the magnet ball pair.

With reference to Figure 1,2, and 3, the driving magnet comprises an annular

electromagnet 5 arranged on the outer periphery of the annular housing 7, which has the

first magnet 51 and the second magnet 52. The first magnet 51 and the second magnet 52

are arranged sequentially and alternately along the circumferential direction. The first

magnet 51 is arranged above the second magnet 52 for attracting nutating disk to swing

upward when energized and to swing downward when the second magnet is energized. In

this case, the nutating disk 6 does not rotate when the nutating disk 6 swings up and

down.

In the first embodiment, one of the first magnet 51 and the second magnet 52 in the

circumferential direction of the annular electromagnet 5 is arranged as the other of the

first magnet 51 and the second magnet 52 at a position opposite to each other in the

circumferential direction of the annular electromagnet 5. For example, if the first magnet

51 is located at the first position in the circumferential direction of the annular electromagnet 5, the second magnet 52 is arranged at the first position, so that when the first magnet 51 at the first position attracts the nutation 6 to move upwards, the second magnet 52 at the second position attracts the nutating disk 6 to move downwards, thus maintaining the inclined state of the nutating disk 6.

The first magnet 51 and the second magnet 52 form an independent annular

electromagnet 5 distributed in a crevasse shape, which is annularly arranged at the outer

position of the nutating disk 6; the first magnet 51 is located on the upper side of the

nutating disk 6, and the second magnet 52 is located on the lower side of the upper

surface of the nutating disk 6, so that one of the first magnet 51 and the second magnet 52

is electrified with a forward current. Thus, one end of the nutating disk 6 is attracted

upward (or downward). A reverse current is applied to the other side of the first magnet

51 and the second magnet 52 at the opposite position, and the opposite position on the

nutating disk 6 is attracted downward (or upward), that is, the nutating disk 6 is inclined

at the nutating angle, and the first magnet 51 and the second magnet 52 are energized in a

certain order (clockwise or counter clockwise), and one of the first magnet 51 and the

second magnet 52 is always kept positive current during the energization process. The

other side of the first magnet 51 and the second magnet 52, which are arranged opposite

to each other, is energized reverse current, so that the nutating disk 6 keeps tilting and

swings up and down, performing nutating motion and forming a pump mechanism. The

nutating disk 6 is switched on for one cycle, that is, the nutating disk 6 achieves one cycle

of nutation, and the higher the frequency of switching on, the faster the nutating speed of

the nutating disk 6.

The upper and lower end faces of nutating disk 6 are set to have different polarities. For

example, the upper surface of nutating disk 6 is N-pole and the lower surface is S-pole.

When first magnet 51 is energized, S-pole will be generated to attract one end of nutating

disk 6, and the second secondary body will generate N-pole to attract the other end of

nutating disk 6.

In the first embodiment, referring to Figure 2 and 4, the upper cover 2 has a lower conical

surface 23, and the lower cover 8 has an upper conical surface 81. The upper and lower

walls of the accommodation chamber are composed of partial spherical surfaces of the

first hemispherical magnet and the second hemispherical magnet, a lower conical surface

23 and an upper conical surface 81. The magnetically levitated nutation artificial heart

pump further comprises a blocking mechanism, which is arranged in the accommodation

chamber and located between the first through port 21 and the second through port 22

along the circumferential direction. The upper surface and the lower surface of the

nutating disk 6 are in line contact with the lower conical surface 23 and the upper conical

surface 81, respectively, and the accommodating chamber is divided into a first chamber

and a second chamber in cooperation with the blocking mechanism.

The blocking mechanism includes a chute plate and a partition plate. The edge of the

nutating disk 6 is provided with a notch for the chute plate to pass through. Pins located

in the notch are arranged between the first and second hemispheric magnets on both sides

of the nutating disk 6. One end of the chute plate facing the nutating disc 6 is provided

with a chute for pins to slide in a vertical plane, so that the nutating disk 6 will not move

along the circumferential direction when swinging up and down. The partition plate and

the upper and lower ends of the chute plate are fixed in the upper cover 2 and the lower cover 8 respectively, and one end of the partition plate is closely connected with the chute plate. In this embodiment, the upper cover 2 and the lower cover 8 have grooves for accommodating the chute plate and the partition plate.

In the first embodiment, the inner peripheral wall of the annular housing 7 has an arc

shaped portion to abut against the outer peripheral wall of the nutating disc 6 when the

nutating disc 6 swings up and down.

In the first embodiment, referring to Figure 3, the first hemispherical magnet includes a

first hemispherical shell 41 and a first annular magnetic member 43 arranged in the

hemispherical shell, and the second hemispherical magnet includes a second

hemispherical shell 42 and a second annular magnetic member 44 arranged in the second

hemispherical shell 42. The upper cover 2 is provided with a third annular magnetic

member 31, and the lower cover 8 is provided with a fourth annular magnetic member 32.

The third annular magnetic member 31 and the first annular magnetic member 43 are

arranged at the same pole, and the fourth annular magnetic member 32 and the second

annular magnetic member 44 are arranged at the same pole, so that a pair of repulsive

forces are generated between the third annular magnetic member 31 and the first annular

magnetic member 43, and a pair of repulsive forces are generated between the fourth

annular magnetic member 32 and the second annular magnetic member 44.

Among them, the third annular magnetic member 31 is configured as an annular

mechanism with a through hole in the middle to supply the high-frequency

electromagnetic field generated by the eddy current sensor 1 to pass through the first

hemispherical magnet close to it, that is, to enable the eddy current sensor 1 to obtain an

accurate impedance value.

With reference to Figure1 to Figure 4, the annular electromagnet 5 is energized clockwise

or counter clockwise in sequence. when the first magnet 51 is energized, it generates

magnetic force to attract one end of the nutating disk 6, while the opposite second magnet

52 attracts the nutating disk 6 in the opposite direction, so that the nutating disk 6 can

achieve a periodic nutating movement after the first magnet 51 and the second magnet 52

are energized in turn along the circumferential direction of the annular electromagnet 5.

The accommodation chamber of the heart pump is surrounded by a part of spherical

surface and upper and lower inner conical surfaces. The nutating disk 6 is in an inclined

state in the accommodation chamber under the action of the annular electromagnet 5 and

is in line contact with the upper and lower conical surfaces 23 of the accommodation

chamber. The upper and lower surfaces of the nutating disk 6 are in line contact with the

inner conical surfaces of the upper cover 2 and the lower cover 8 respectively, and the

contact line divides the cavity into two areas. When the electrifying sequence of the

electromagnet 3 is counter clockwise rotation (this embodiment takes counter clockwise

as an example, but other embodiments can be clockwise), the nutating disk 6 makes

counter clockwise circular swing (without rotation), and the contact wire also makes

counter clockwise rotation, and the rotating speed of the contact wire is equal to the

electrifying circulating speed of the annular electromagnet 5. At this time, the area of the

first chamber (connected with the first through port 21, which is the liquid inlet at this

time) is constantly enlarged, forming negative pressure. The fluid flows in from the first

through port 21, and the second chamber keeps getting smaller, which pushes the fluid

out from the second through port 22. When the contact line turns to the baffle, the first

chamber reaches its maximum and the second chamber reaches its minimum. The contact line bypasses the baffle in a short time, turning the original first through port 21 into a liquid outlet, the second through port 22 into a liquid inlet, and then the second chamber becomes large from small while the first chamber becomes small from large, and so on.

In this embodiment, the heart pump is driven by non-contact electromagnetic drive, and a

motor is not needed to drive the nutating disk 6, so that the driving part is not in contact

with the working part. The nutating disk 6 of the working part adopts the magnet ball pair

4 to realize complete passive levitation. It has the advantages of no friction, no

lubrication, low noise, less heat and high energy efficiency ratio, which completely solves

the problems of "loosing, overflowing, dripping and leaking", reduces the probability of

hemolysis and thrombus produced by ventricular auxiliary pump and the pollution to

blood, and greatly improves the performance and service life of the pump. According to

the invention, electromagnetic force is adopted as the power of the heart pump, so that the

pump is small in volume and compact in structure, and is convenient for surgical

transplantation.

The eddy current sensor 1 of the levitation detection mechanism of this embodiment also

adopts non-contact measurement, and has the characteristics of strong anti-interference

ability, high precision, high sensitivity, economy, nondestructive measurement and

simple operation, and can accurately detect the levitation state of the nutating disk 6

without setting an external reference point.

Second embodiment:

In a second embodiment, the present invention also provides a magnetically levitated

nutation artificial heart pump system, which comprises the magnetically levitated

nutation artificial heart pump of any of the above embodiments and control devices electrically connected to the eddy current sensor 1 and the driving magnet respectively, wherein the control devices comprise a processor, a memory and a computer program stored in the memory and operable on the processor. When the processor executes the computer program, the following steps are realized: the first magnet 51 and the second magnet 52 are sequentially energized at a preset frequency in a clockwise or counter clockwise direction, so that the nutating disk 6 swings up and down at a preset frequency in a clockwise or counter clockwise direction.

The step of sequentially energizing the first magnet 51 and the second magnet 52 in a

clockwise or counter clockwise direction at a preset frequency includes simultaneously

energizing one of the first magnet 51 and the second magnet 52 at opposite positions in

the circumferential direction of the annular electromagnet 5, so that the nutating disk 6

maintains inclined relative to the accommodation chamber.

Other features not mentioned in the second embodiment can be the same as those in the

first embodiment, and the adopted variant embodiments and their beneficial effects can

be the same as those in thefirst embodiment, so they will not be described in detail.

The above is only a preferred embodiment of the present invention, and is not used to

limit the present invention. For those skilled in the field, the present invention can be

modified and varied. Any modification, equivalent substitution, improvement, etc. made

within the spirit and principle of the present invention shall be included in the protection

scope of the present invention.

Claims

THE CLAIMS DEFINING THE INVENTION ARE AS FOLLOWS

1. A magnetically levitated nutation artificial heart pump, comprising an upper cover, a

accommodation chamber; the nutation mechanism divides the accommodation chamber

change the size of the first chamber and the second chamber, characterized in that:

It also includes a levitation detection mechanism, and the levitation detection mechanism

includes:

The magnet ball pair, including a first hemispherical magnet arranged on the upper side

of the nutating disk and a second hemispherical magnet arranged on the lower side of the

nutating disk;

properties so that the magnet ball pair is suspended in the accommodation chamber;

andthe eddy current sensor penetrates the upper cover and has a preset gap from the first

hemispherical magnet when the magnet ball pair is suspended;

The eddy current sensor obtains the actual gap between the eddy current sensor and the

magnet ball pair by obtaining the impedance value generated between it and the first hemispherical magnet after power-on, so as to obtain the levitation state of the magnet ball pair.

2. A magnetically levitated nutation artificial heart pump according to claim 1, wherein

the driving magnet comprises an annular electromagnet ring arranged on the outer

attracting nutating disk to swing upward when energized and attracting nutating disk to

swing downward when the second magnet is energized.

3. A magnetically levitated nutation artificial heart pump according to claim 2, wherein

one of the first magnet and the second magnet is arranged as the other of the first magnet

and the second magnet at a position opposite to each other along the circumferential

direction of the annular electromagnet.

4. The magnetically levitated nutation artificial heart pump according to claim 3,

characterized in that, along the circumferential direction of the annular electromagnet, the

first magnet and the second magnet can be energized in order to attract the nutating disk

to swing in order along the circumference, thus making the nutating disk move.

5. A magnetically levitated nutation artificial heart pump according to any one of claims

3 to 4, wherein the upper cover has a lower conical surface; the lower cover has an upper

and the lower surface of the nutating disk are in line contact with the lower conical surface and the upper conical surface respectively, so as to divide the accommodation chamber into a first chamber and a second chamber.

6. A magnetically levitated nutation artificial heart pump according to any one of claims

3 to 4, wherein the inner peripheral wall of the annular housing has an arc part to abut

against the nutating disk when the nutating disk swings up and down.

7. A magnetically levitated nutation artificial heart pump according to any one of claims

3 to 4, wherein the first hemispherical magnet comprises a first hemispherical shell and a

first annular magnetic member arranged in the hemispherical shell; the second

hemispherical magnet includes a second hemispherical shell and a second annular

magnetic member arranged in the second hemispherical shell; the upper cover is provided

with a third annular magnetic member which is opposite to the first annular magnetic

member at the same pole; the lower cover is provided with a fourth annular magnetic

member which is opposite to the second annular magnetic member at the same pole;

8. A magnetically levitated nutation artificial heart pump system, characterized by

comprising the magnetically levitated nutation artificial heart pump of any one of claims

3-7, and a control device electrically connected to the eddy current sensor and the drive

magnet, respectively; the control device includes a processor, a memory, and a computer

program that is stored in the memory and can run on the processor, and the processor

implements the following steps when the processor executes the computer program:

The first magnet and the second magnet are sequentially energized at a preset frequency

in a clockwise or counter clockwise direction, so that the nutating disk swings up and

down at the preset frequency in a clockwise or counter clockwise direction.

9. The magnetically levitated nutation artificial heart pump system of claim 8, wherein

the first magnet and the second magnet are energized in a clockwise direction or counter

clockwise at a preset frequency in sequence, including:

One of the first magnet and the second magnet at the opposite positions of the annular

electromagnet in the circumferential direction is simultaneously energized, so that the

nutating disk is maintained inclined with respect to the accommodation chamber.

FIGURES 1/3

Figure 1