Implantable magnetic suspension blood pump structure

Abstract

According to the implantable magnetic suspension blood pump structure, an impeller is suspended in a containing cavity of a pump shell and can rotate around the central axis of the pump shell, and blood is sucked in from an inlet and discharged from an outlet; the motor comprises a motor stator assembly arranged in the pump shell and a rotor magnet array arranged on the impeller. The magnetic suspension device comprises an electromagnet arranged in the pump shell and a suspension magnet assembly arranged on the impeller, and electromagnetic suspension force provided by the electromagnet and passive permanent magnet bias suspension force provided by the suspension magnet assembly jointly maintain suspension balance of the impeller. The motor and the magnetic suspension device are independently controlled, so that the negative influence of low signal detection accuracy caused by magnetic field coupling is effectively reduced; the hybrid magnetic suspension structure reduces power consumption of the magnetic suspension device; the arrangement positions of the motor stator assembly and the electromagnet enable the blood pump to be compact in structure and reduce the size and weight; the gap and the position of the electromagnet and the suspension magnet assembly are accurately controlled, accurate control over the suspension position of the permanent magnet is achieved, and the pumping efficiency and stability of the blood pump are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to an implantable magnetic levitation blood pump structure. Background Art

[0002] Heart failure, abbreviated as HF, refers to a syndrome in which the heart's systolic function and / or diastolic function are impaired, and the venous return blood volume cannot be fully discharged from the heart, resulting in blood stasis in the venous system and insufficient blood perfusion in the arterial system, thus causing a cardiac circulatory disorder syndrome. As a device for compensating and replacing the pumping function of the heart, an artificial heart provides a new medical means for HF patients. As the third-generation artificial heart, the magnetic levitation blood pump is widely used due to its excellent characteristics of small size and good blood compatibility. In the existing magnetic levitation blood pumps, the coupling phenomenon occurs between the motor magnetic field and the magnetic levitation magnetic field, resulting in a large interference problem when the control system detects the rotor position signal, and there may be a large risk of out-of-control; at the same time, the magnetic force for controlling the rotor suspension is completely provided by the electromagnetic coil, which greatly increases the energy consumption of the control system. In addition, for an implantable magnetic levitation blood pump, small volume and small weight are also key indicators in the design. Summary of the Invention

[0003] The object of the present invention is to provide an implantable magnetic levitation blood pump structure with small volume, light weight and realizing axial-radial coupling regulation.

[0004] To achieve the above object, the technical solution adopted by the present invention is: an implantable magnetic levitation blood pump structure, comprising: A pump housing, which has a receiving cavity and an inlet and an outlet for guiding and discharging blood; An impeller, which is magnetically levitated and positioned at the central region of the pump housing cavity and can rotate around the central axis of the pump housing to suck blood from the inlet and discharge it from the outlet; A motor, including a motor stator assembly arranged in the pump housing and a rotor magnet array arranged on the impeller, and the two are arranged in the radial direction. The motor stator assembly provides a rotating magnetic field to drive the rotor magnet array to drive the impeller to rotate; A magnetic levitation device, including an electromagnet arranged in the pump housing and a suspension magnet assembly arranged on the impeller, and the two are arranged in the radial direction. The active electromagnetic levitation force provided by the electromagnet and the passive permanent magnet bias levitation force provided by the suspension magnet assembly act together to make the impeller maintain a balanced suspension state in the axial and radial directions; In the radial direction, the motor is generally located inside the magnetic levitation device.

[0005] The impeller described above includes an impeller body and a pipe column disposed on the impeller body. The outer diameter of the pipe column is smaller than that of the impeller body. Multiple blades with streamlined designs are arranged on the impeller body. The blades and the upper panel and the lower panel form a main flow channel. The inner cavity of the pipe column communicates with the flow channel. The rotor magnet array and the magnetic levitation magnet assembly are both disposed inside the pipe column and are arranged one above the other axially. The electromagnet is disposed on the outer periphery of the pipe column and is arranged corresponding to the magnetic levitation magnet assembly radially. The motor stator assembly is located in the inner cavity of the pipe column and is arranged corresponding to the rotor magnet array radially.

[0006] The motor stator assembly described above includes a fixing member fixed on the pump housing. A plurality of stator cores are arranged at intervals along the circumference of the outer periphery of the fixing member. The cross-section of the stator core is in the shape of "「", including a vertical plate and a bending plate extending radially outward at the top of the vertical plate. The stator coil is wound around the outer periphery of the vertical plate, and the end face of the bending plate is arranged corresponding to the rotor magnet array radially.

[0007] An annular stator yoke is provided at the lower part of the stator core. The stator yoke fixes the plurality of stator cores into an integral structure. A main control PCB board is also provided at the bottom of the stator core.

[0008] The cross-section of the fixing member is in the shape of T, including a column body and a top plate. The diameter of the top plate is larger than that of the column body. The outer ring of the top plate abuts against the inner ring of the stator core. A groove whose shape fits the bending plate is provided on the top plate, and the bending plate is clamped and fixed in the groove. The stator coil is filled in the gap between the stator core and the column body.

[0009] The pump housing described above includes a bottom shell, a middle shell and an upper shell. The bottom shell and the middle shell are butted to form a sealed chamber for installing the motor stator assembly and the magnetic levitation assembly. The middle shell and the upper shell are butted to form a blood chamber for installing the impeller. A guiding portion protruding towards the blood chamber is provided in the middle of the middle shell. The outer periphery of the guiding portion forms a groove for the pipe column to be embedded. The motor stator assembly is disposed in the inner cavity of the guiding portion, and the outer ring of the stator core abuts and is fixed to the inside of the guiding portion.

[0010] The top of the guiding portion protrudes into the inner cavity of the impeller body and the top is less than or equal to 1 / 2 of the inner cavity of the impeller body. The top of the guiding portion is in the shape of a smooth conical surface. The gap between the pipe column and the groove forms a secondary flow channel. The blood passes through the secondary flow channel and then is guided by the guiding portion into the inner cavity of the impeller body and is mixed with the blood in the inner cavity of the impeller body. The electromagnet is disposed in the sealed chamber outside the groove.

[0011] The electromagnet described above includes a plurality of magnetic levitation cores arranged at equal intervals along the outer periphery of the groove. The magnetic levitation core is a structure with a U-shaped cross-section and an opening radially inward, including a bottom plate, and upper side plates and lower side plates located on both sides of the bottom plate. The magnetic levitation coil is wound around the bottom plate. A distance sensor is provided on the side surface of the lower side plate, and a distance sensor PCB board is provided below the distance sensor.

[0012] The described magnetic suspension magnet assembly includes an annular magnet embedded in the inner wall of the pipe column, and upper and lower magnetic conductive rings arranged on the upper and lower end faces of the annular magnet. The upper and lower magnetic conductive rings are respectively arranged corresponding to the upper side plate and the lower side plate in the radial direction. A galvanized sheet is arranged on one side of the rotor magnet array facing the magnetic suspension magnet assembly to divert the magnetic field of the rotor magnet array on this side and weaken the coupling interference of its magnetic field on the magnetic suspension magnet assembly.

[0013] A plurality of support columns protrude upward from the bottom of the bottom shell, and the tops of the support columns are in contact with and form a limiting fit with the stator iron core and the magnetic suspension iron core.

[0014] The above solution has at least the following beneficial effects: The motor and the magnetic suspension device are controlled separately, effectively reducing the negative impact of low signal detection accuracy caused by magnetic field coupling, and improving the control accuracy and system stability. The magnetic suspension device adopts a hybrid magnetic suspension combining passive permanent magnet bias magnetic field and active electromagnetic control. The bias magnetic field of the annular permanent magnet is used to provide passive magnetic force, reducing the power consumption of the magnetic suspension device. The motor stator assembly is arranged in the area where the inner cavity of the pipe column is located, and the electromagnet is arranged around the outer periphery of the pipe column. The overall structure is compact, reducing the size of the entire blood pump, reducing the weight, facilitating implantation into the human body, and improving the wearing comfort. Due to the special structure setting of the magnetic suspension device, by precisely controlling the gap and positional relationship between the electromagnet and the magnetic suspension magnet assembly, precise control of the suspension position and state of the impeller permanent magnet can be achieved, thereby avoiding hard friction between the impeller and the inner wall of the pump shell, and improving the biocompatibility and stability of the blood pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is an external view of the magnetic suspension blood pump; Figure 2 、 Figure 3 is a front sectional view of the magnetic suspension blood pump. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] For the convenience of understanding, the terms "upper", "lower", "horizontal", "inner", "outer", etc. involved in the text indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0017] Since the magnetic levitation blood pump is implanted at the apex of the heart, the impeller is levitated in the pump chamber through magnetic levitation technology to reduce mechanical wear and effectively transport blood. Therefore, in its design, not only biocompatibility and structural compactness need to be considered, but also its mechanical properties (efficiency of driving force, stability of levitation force, and mechanical stability), electromagnetic properties (magnetic field strength, electromagnetic compatibility, and power consumption), and blood compatibility (materials, structures, and flow fields) need to be considered.

[0018] A structure of an implantable magnetic levitation blood pump, as Figures 1 - 3 shown, includes: A pump housing 10, which has an accommodation cavity and inlets 14 and outlets 15 for guiding and discharging blood; the accommodation cavity is used to accommodate an impeller 20, a motor 30, and a magnetic levitation device 40.

[0019] The impeller 20 is magnetically levitated and dynamically positioned at the central region of the chamber of the pump housing 10 and can rotate around the central axis of the pump housing 10 to suck blood from the inlet 14 and discharge it from the outlet 15; theoretically, the impeller 20 rotates around the central axis, but in fact it is in dynamic balance. When there is a tendency to tilt, it is corrected in time by the control system so that the impeller 20 as a whole rotates around the central axis.

[0020] The motor 30 includes a motor stator assembly 31 disposed in the pump housing 10 and a rotor magnet array 32 disposed on the impeller 20. The motor stator assembly 31 provides a rotating magnetic field to drive the rotor magnet array 32 to drive the impeller 20 to rotate. At this time, the driving force for the impeller 20 to rotate can be adjusted by controlling the current vector parameters in the motor stator assembly 31 to adjust the rotation speed of the impeller 20; The magnetic levitation device 40 includes an electromagnet 41 disposed within the pump housing 10 and a suspension magnet assembly 42 disposed on the impeller 20. The electromagnetic levitation force provided by the electromagnet 41 and the permanent magnetic levitation force provided by the suspension magnet assembly 42 act together to keep the impeller 20 in a balanced levitation state axially and radially. By adjusting the magnitude and direction of the current in the electromagnet 41, the impeller 20 is stably levitated and always rotates around the central axis of the inner cavity of the pump housing 10. During the blood pumping process, the impeller 20 does not rub against the inner cavity of the pump housing 10, thereby reducing blood damage. When the electromagnet 41 is energized, a magnetic field is generated. This magnetic field interacts with the ferromagnetic material in the impeller 20 to generate an upward electromagnetic force. By controlling the current and magnetic field strength of the electromagnet 41, the magnitude and direction of this electromagnetic force can be precisely adjusted, thereby achieving the levitation of the impeller 20. In addition, the suspension magnet assembly 42 can provide a passive permanent magnetic bias field to provide a passive magnetic levitation force. However, the passive magnetic levitation force is in an open-loop state, and an actively regulated magnetic field needs to be provided by the electromagnet 41 to balance the fluctuations of the passive magnetic levitation force, achieving the effect of closed-loop control. In this way, the levitation force required for the levitation of the impeller 20 is mainly provided by the permanent magnetic bias field, and the electromagnet 41 only needs to provide an adjusted magnetic field, greatly reducing the demand for the magnetic flux of the electromagnet 41 and achieving the purpose of energy conservation and consumption reduction.

[0021] The magnetic levitation device 40 is located outside the axis of the blood pump, and the motor 30 is located inside the axis of the blood pump. That is, in the physical space, in the radial direction, the motor 30 is generally located inside the magnetic levitation device 40. The electromagnet 41 and the suspension magnet assembly 42 are generally located on the outer periphery of the motor stator assembly 31 and the rotor magnet array 32, making reasonable use of the internal space of the pump housing 10 to arrange the magnetic levitation device 40 and the motor 30, further reducing the volume and weight of the blood pump.

[0022] In summary, the motor 30 and the magnetic levitation device 40 in the present invention are controlled separately, achieving decoupling at the mechanical structure level, effectively reducing the negative impact of low signal detection accuracy caused by magnetic field coupling, and improving the control accuracy and system stability. The magnetic levitation device 40 adopts a hybrid magnetic levitation structure (permanent magnetic levitation + electromagnetic levitation), using the bias magnetic field of the ring-shaped permanent magnet to provide passive magnetic force and reducing the power consumption of the magnetic levitation module.

[0023] The impeller 20 described above includes an impeller body 21 and a pipe column 22 provided on the impeller body 21. The outer diameter of the pipe column 22 is smaller than the outer diameter of the impeller body 21. A plurality of blades 211 with a streamlined design are provided on the impeller body 21. The blades, the upper panel 212 and the lower panel 213 of the impeller form a main flow channel 214. The inner lumen of the pipe column 22 communicates with the main flow channel 214. The rotor magnet array 32 and the suspension magnet assembly 42 are both provided inside the pipe column 22 and are arranged vertically above and below each other in the axial direction. The electromagnet 41 is provided on the outer periphery of the pipe column 22 and is arranged corresponding to the suspension magnet assembly 42 in the radial direction. The motor stator assembly 31 is located inside the lumen of the pipe column 22 and is arranged corresponding to the rotor magnet array 32 in the radial direction. Since the outer diameter of the pipe column 22 is smaller than the outer diameter of the impeller body 21, the cross-section of the entire impeller 20 is T-shaped, and installation spaces for the electromagnets 41 are left on both sides. In this way, the motor stator assembly 31 is arranged in the area where the lumen of the pipe column 22 is located, while the electromagnets 41 are arranged around the outer periphery of the pipe column 22. The overall structure is compact, reducing the size of the entire blood pump and facilitating implantation into the human body.

[0024] The specific structure is as follows: The motor stator assembly 31 includes a fixing member 311 fixed on the pump housing 10. A plurality of stator cores 312 are arranged at intervals along the circumferential direction on the outer periphery of the fixing member 311. The cross-section of the stator core 312 is in the shape of "「", including a vertical plate 312a and a bending plate 312b extending radially outward at the top of the vertical plate 312a. The stator coil 313 is wound around the outer periphery of the vertical plate 312a, and the end face of the bending plate 312b is arranged corresponding to the rotor magnet array 32 in the radial direction. As can be seen from the figure, the vertical plate 312a of the stator core 312 and the stator coil 313 wound thereon are not aligned with the rotor magnet array 32 in the radial direction, but are aligned with the rotor magnet array 32 in the radial direction through the bending plate 312b extending radially outward at the top of the vertical plate 312a. The advantages of this setting are as follows: on the one hand, it can ensure that the stator core 312 and the rotor magnet array 32 can form a specific annular magnetic circuit, thereby improving the pumping efficiency and stability of the blood pump; on the other hand, the coils are arranged axially and then have a 90° bend at the top, and the end of the bend faces the rotor magnet array 32 again. In this way, it can not only save the radial space but also optimize and reduce the space of the maximum diameter of the pump. At the same time, as can be seen from the attached drawing, the end face of the bending plate 312b is closely attached to the inside of the guiding part 121, so it also plays a role of fixing and limiting, enhancing the structural stability of the blood pump, reducing the noise and vibration generated during the operation of the blood pump, and improving the comfort and treatment effect of the patient.

[0025] A circular stator yoke 314 is provided at the lower part of the stator core 312. The stator yoke 314 fixes multiple stator cores 312 into an integral structure, enabling each stator core 312 to be located within the same circumferential plane, with a compact structure. A main control PCB board 315 is also provided at the bottom of the stator core 312. The main control PCB board 315 plays multiple roles in controlling the operation of the motor, monitoring the motor state, protecting the motor safety, and providing a communication interface, etc. in the blood pump.

[0026] The cross-section of the fixing member 311 is T-shaped, including a column body 311a and a top plate 311b. The diameter of the top plate 311b is larger than that of the column body 311a. The outer circle of the top plate 311b abuts against the inner circle of the stator core 312. The stator coil 313 is filled in the gap between the stator core 312 and the column body 311a. This structural setting, on the one hand, reduces the occupied space of the motor stator assembly 31, making the structure compact and the overall volume of the blood pump smaller; on the other hand, different components are mutually limited in position, enhancing the stability of the blood pump structure, reducing the noise and vibration generated during the operation of the blood pump, and improving the comfort and treatment effect of the patient.

[0027] The pump housing 10 includes a bottom shell 11, a middle shell 12, and an upper shell 13. The bottom shell 11 and the middle shell 12 are butted to form a sealed chamber A for installing the motor stator assembly 31 and the magnetic levitation assembly 42. The middle shell 12 and the upper shell 13 are butted to form a blood chamber B for installing the impeller 20. A guiding portion 121 protruding into the blood chamber B is provided in the middle of the middle shell 12. A groove 122 for embedding the pipe column 22 is formed on the outer periphery of the guiding portion 121. The motor stator assembly 31 is arranged in the inner cavity of the guiding portion 121, and the outer circle of the stator core 312 is fixedly abutted against the inside of the guiding portion 121. The sealed chamber A and the blood chamber B are separated by a structure similar to a partition on the middle shell 12. By designing the shape of the partition, the structures of the groove 122 and the guiding portion 121 are obtained, and at the same time, a space for installing the motor stator assembly 31 is formed, making the overall structure compact and occupying less space, further reducing the volume of the entire blood pump. The sealed chamber A and the blood chamber B are isolated from each other, and no blood, impurities, etc. will enter the sealed chamber A, and only the magnetic field is allowed to pass through, thereby ensuring the stability of the performance of the motor stator assembly 31 and the electromagnet 41.

[0028] The top of the flow guide portion 121 protrudes into the inner cavity of the impeller body 21 and is less than or equal to 1 / 2 of the inner cavity of the impeller body 21. The top of the flow guide portion 121 is in the shape of a smooth conical surface. The gap between the pipe column 22 and the groove 122 forms a secondary flow channel C. After the blood passes through the secondary flow channel C, it is then guided by the flow guide portion 121 into the inner cavity of the impeller body 21 and mixes with the blood in the inner cavity of the impeller body 21. The electromagnet 41 is arranged in the sealed chamber A outside the groove 122. Due to the existence of the pressure difference, the blood flow above will flow through the secondary channel C to form a secondary flow. The setting of the secondary flow channel C has at least the following beneficial effects: (1) Improving the blood flow state: During the process of the blood in the pump chamber being transported from the blood inlet to the blood outlet, blood flow disorder is likely to occur. The secondary flow channel C can adjust the blood flow, reduce the generation of blood flow vortices, reduce the shear force on the blood in the vortex region, and prevent red blood cell rupture. (2) Preventing thrombus formation: The secondary flow channel C can promote the proper flow of blood in all corners of the pump chamber, avoid blood stagnation in some areas, and reduce the possibility of thrombus formation. (3) Improving the blood pump efficiency: The secondary flow channel C can adjust the blood inflow and outflow angles to a certain extent, making the blood enter and leave the impeller area more smoothly and improving the blood pumping efficiency. (4) Heat dissipation function: The blood pump generates heat during the blood pumping process. When the blood flows through the secondary flow channel C, it can absorb and carry away the surrounding heat, preventing local overheating from damaging the blood components.

[0029] Similarly, the electromagnet 41 includes a plurality of magnetic suspension iron cores 411 arranged at equal intervals along the outer circumference of the groove 122. The number of magnetic suspension iron cores 411 is preferably not less than 4 and is an even number. By controlling the current magnitudes of the two magnetic suspension coils 412 on the same diagonal line, the impeller 20 can be quickly returned to the correct position. The impeller 20 is completely suspended in the blood chamber B by magnetic force, that is, centered axially. During the rotation of the impeller 20, if there is a tendency to deviate to one side, by increasing the current of the magnetic suspension coil 412 on that side and decreasing the current of the magnetic suspension coil 412 on the opposite side, different magnitudes of magnetic forces are received on both sides of the magnetic suspension magnet assembly 42, and then the position is returned to the correct position, thereby preventing the rotation axis of the impeller 20 from deviating and ensuring that the impeller 20 always rotates around the longitudinal axis, with high stability. In order to accurately control the position of the impeller 20, a plurality of magnetic suspension iron cores 411 are circumferentially spaced apart, and a plurality of magnetic suspension coils 412 are also correspondingly arranged.

[0030] The specific structure is as follows: The maglev iron core 411 has a U-shaped cross-section with the opening facing radially inward, including a bottom plate 411a, and upper side plates 411b and lower side plates 411c located on both sides of the bottom plate 411a. The maglev coil 412 is wound around the bottom plate 411a. A distance sensor 413 is provided on the side surfaces of the upper and lower side plates 411c, and a distance sensor PCB board 414 is provided below the distance sensor 413. The distance sensor 413 monitors the position of the impeller 20 in real time and transmits the position signal to the control unit. The control unit controls the magnitude of the current in the maglev coil 412 to change the levitation force to ensure that the position of the impeller 20 is centered. The 4-pole, 6-pole or 8-pole maglev iron cores 411 can be evenly spaced along the outer circumference of the groove, with a group arranged every 90°, 60° or 45° respectively, and made of 0.2 mm silicon steel laminations to reduce eddy current losses. The distance sensor 413 is symmetrically arranged corresponding to the 4-pole, 6-pole or 8-pole of the maglev iron core 411, with a group arranged every 90°, 60° or 45° respectively, and a distance sensor PCB board is provided below the distance sensor.

[0031] The described magnetic suspension magnet assembly 42 includes an annular magnet 421 embedded in the inner wall of the pipe column 22, and upper and lower magnetic conduction rings 422 and 423 provided on the upper and lower end faces of the annular magnet 421. The upper and lower magnetic conduction rings 422 and 423 are respectively arranged corresponding to the upper side plate 411b and the lower side plate 411c in the radial direction. The setting of the magnetic conduction rings can optimize the properties of the magnetic suspension system, and the specific manifestations are as follows: (1) Enhance the stability of the magnetic field: The magnetic conduction rings can guide the magnetic field lines, making the magnetic field distribution more uniform, and improving the stability and reliability of the system; (2) Improve the magnetic suspension efficiency: The magnetic conduction rings can enhance the magnetic interaction between the annular permanent magnet and the magnetic suspension coil 412, thereby improving the suspension efficiency; (3) Reduce eddy current losses: The magnetic conduction rings can guide the magnetic ring to avoid certain specific areas, thereby reducing eddy current losses, and at the same time, they also have the function of suppressing electromagnetic interference. The upper and lower magnetic conduction rings 422 and 423 are respectively arranged corresponding to the upper side plate 411b and the lower side plate 411c in the radial direction. In this way, the annular magnet 421 is suspended between the magnetic suspension iron cores 411. The upper and lower magnetic conduction rings 422 and 423 guide the magnetic field lines, making the magnetic field more evenly distributed between the electromagnet 41 and the annular magnet 421, which helps to improve the suspension efficiency and stability; the magnetic field lines can pass through the magnetic circuit along their routes under the guidance of the upper and lower magnetic conduction rings 422 and 423, thereby reducing magnetic leakage and improving the performance of the magnetic suspension system; due to the alignment of the two end faces in the radial direction, by precisely controlling the gap and positional relationship between the two, precise control of the suspension position of the permanent magnet can be achieved, thereby improving the pumping efficiency and stability of the blood pump. Since the rotor magnet array 32 is located directly above the magnetic suspension magnet assembly 42, in order to avoid electromagnetic interference between different magnetic circuits, a galvanized sheet 43 is provided on the side of the rotor magnet array 32 facing the magnetic suspension magnet assembly 42 to divert the magnetic field of the rotor magnet array 32 on this side and weaken its coupling interference with the magnetic field of the magnetic suspension magnet assembly 42. The setting of the galvanized sheet 43 weakens the electromagnetic interference and improves the independence and stability of the respective controls of the motor 30 and the magnetic suspension device 40.

[0032] A plurality of support columns 16 protrude upward from the bottom of the bottom case 11. The tops of the support columns 16 are in contact with the stator iron core 312 and the magnetic suspension iron core 411 and form a limiting fit. This structure simplifies the assembly process of the blood pump and also ensures the stability of the positions of the components inside the blood pump.

[0033] It should be noted that some embodiments of the present application are described above. Other embodiments are within the scope of the appended claims. In some cases, the solutions or steps recited in the claims can be executed in a different order from those in the above embodiments and still achieve the desired results. Additionally, the processes depicted in the drawings do not necessarily require the specific order or sequential order shown to achieve the desired results. In certain embodiments, multitasking and parallel processing are also possible or may be advantageous.

Claims

1. An implantable magnetic suspension blood pump structure, characterized in that: include: A pump housing (10) having a receiving cavity and an inlet (14) and an outlet (15) for guiding and discharging blood; An impeller (20) is positioned in a magnetically suspended manner in a central area of ​​a chamber of the pump housing (10) and is capable of rotating around a central axis of the pump housing (10) to draw blood from the inlet (14) and discharge blood from the outlet (15); The motor (30) comprises a motor stator assembly (31) disposed in the pump housing (10) and a rotor magnet array (32) disposed on the impeller (20), and the two are arranged in a radial direction, the motor stator assembly (31) providing a rotating magnetic field to drive the rotor magnet array (32) to drive the impeller (20) to rotate; The magnetic suspension device (40) comprises an electromagnet (41) disposed in a pump housing (10) and a suspension magnet assembly (42) disposed on an impeller (20), the two being arranged in a radial direction, wherein an active electromagnetic suspension force provided by the electromagnet (41) and a passive permanent magnetic bias suspension force provided by the suspension magnet assembly (42) act together to maintain the impeller (20) in a balanced suspension state in the axial and radial directions; In the radial direction, the motor (30) is located as a whole on the inner side of the magnetic suspension device (40).

2. The implantable magnetic suspension blood pump structure according to claim 1, characterized in that: The impeller (20) comprises an impeller body (21) and a pipe column (22) arranged on the impeller body (21); the outer diameter of the pipe column (22) is smaller than the outer diameter of the impeller body (21); a plurality of streamlined blades (211) are arranged on the impeller body (21); the blades (211) and the upper panel (212) and the lower panel (213) form a main flow channel (214); the inner tube cavity of the pipe column (22) is connected to the main flow channel (214); the rotor magnet array (32) and the suspension magnet assembly (42) are both arranged inside the pipe column (22) and are arranged in an upper and lower position in the axial direction; the electromagnet (41) is arranged on the outer periphery of the pipe column (22) and is arranged radially corresponding to the suspension magnet assembly (42); and the motor stator assembly (31) is located in the inner cavity of the pipe column (22) and is arranged radially corresponding to the rotor magnet array (32).

3. The implantable magnetic suspension blood pump structure according to claim 2, characterized in that: The motor stator assembly (31) comprises a fixing member (311) fixed to a pump housing (10); a plurality of stator cores (312) are arranged at intervals along the circumference of the fixing member (311); the cross section of the stator core (312) is in a "" shape, comprising a vertical plate (312a) and a bent plate (312b) located at the top of the vertical plate (312a) and extending radially outward; the stator coil (313) is wound around the outer circumference of the vertical plate (312a), and the end surface of the bent plate (312b) is arranged radially corresponding to the rotor magnet array (32).

4. The implantable magnetic suspension blood pump structure according to claim 3, characterized in that: An annular stator yoke (314) is provided at the lower part of the stator core (312), and the stator yoke (314) fixes the plurality of stator cores (312) into an integrated structure. A main control PCB board (315) is also provided at the bottom of the stator core (312).

5. The implantable magnetic suspension blood pump structure according to claim 3, characterized in that: The fixing member (311) has a T-shaped cross section and comprises a column (311a) and a top plate (311b); the diameter of the top plate (311b) is larger than the diameter of the column (311a); the outer ring of the top plate (311b) abuts against the inner ring of the stator core (312); a groove having a shape matching that of the bending plate (312b) is provided on the top plate (311b); the bending plate (312b) is clamped in the groove and fixed; and the stator coil (313) fills the gap between the stator core (312) and the column (311a).

6. The implantable magnetic suspension blood pump structure according to claim 3, characterized in that: The pump housing (10) comprises a bottom housing (11), a middle housing (12) and an upper housing (13); the bottom housing (11) and the middle housing (12) are butt-jointed to form a sealed chamber (A) for mounting a motor stator assembly (31) and a magnetic suspension assembly (42); the middle housing (12) and the upper housing (13) are butt-jointed to form a blood chamber (B) for mounting an impeller (20); a flow guide (121) protruding toward the blood chamber (B) is provided in the middle of the middle housing (12); a groove (122) is formed on the outer periphery of the flow guide (121) for embedding a pipe column (22); the motor stator assembly (31) is arranged in the inner cavity of the flow guide (121); and the outer ring of the stator core (312) is abutted and fixed to the inside of the flow guide (121).

7. The implantable magnetic suspension blood pump structure according to claim 6, characterized in that: The top of the guide portion (121) protrudes into the inner cavity of the impeller body (21) and the top is less than or equal to 1 / 2 of the inner cavity of the impeller body (21). The top of the guide portion (121) is in the shape of a smooth conical surface. The gap between the tube column (22) and the groove (122) constitutes a secondary flow channel (C). After passing through the secondary flow channel (C), the blood is guided by the guide portion (121) to the inner cavity of the impeller body (21) and mixed with the blood in the inner cavity of the impeller body (21). The electromagnet (41) is arranged in a sealed chamber (A) outside the groove (122).

8. The implantable magnetic suspension blood pump structure according to claim 7, characterized in that: The electromagnet (41) comprises a plurality of magnetic suspension cores (411) arranged at even intervals along the outer circumference of the groove (122); the magnetic suspension core (411) is a structure with a U-shaped cross section and an opening radially inward, comprising a bottom plate (411a), and an upper side plate (411b) and a lower side plate (411c) located on both sides of the bottom plate (411a); a magnetic suspension coil (412) is wound on the bottom plate (411a); a spacing sensor (413) is arranged on the side of the lower side plate (411c); and a spacing sensor PCB board (414) is arranged below the spacing sensor (413).

9. The implantable magnetic suspension blood pump structure according to claim 1, characterized in that: The suspension magnet assembly (42) comprises an annular magnet (421) embedded in the inner wall of the pipe column (22), and an upper magnetic conductive ring (422) and a lower magnetic conductive ring (423) arranged on the upper and lower end surfaces of the annular magnet (421), the upper magnetic conductive ring (422) and the lower magnetic conductive ring (423) being arranged radially corresponding to the upper side plate (411b) and the lower side plate (411c), respectively. A galvanized sheet (43) is arranged on the side of the rotor magnet array (32) facing the suspension magnet assembly (42) to guide the magnetic field of the rotor magnet array (32) on this side, thereby reducing its coupling interference with the magnetic field of the suspension magnet assembly (42).

10. The implantable magnetic suspension blood pump structure according to claim 6, characterized in that: The bottom of the bottom shell (11) is provided with a plurality of support columns (16) protruding upwards, and the tops of the support columns (16) are in contact with the stator iron core (312) and the magnetic suspension iron core (411) to form a limiting fit.

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