Blood pump

Abstract

The present invention provides a blood pump comprising a cannula having a blood flow inlet and a blood flow outlet, an impeller disposed within the cannula, and a drive unit rotating the impeller, the drive unit comprising a housing and a rotor and a stator disposed within the housing, the proximal end of the cannula being connected to the housing, the rotor comprising a rotating shaft, the rotor comprising a rotor shaft, and the rotor comprising a rotor shaft and a stator comprising a rotor shaft. The rotating shaft extends out of the shell and is connected with the impeller; the rotor further comprises at least one magnet assembled on the rotating shaft; the stator comprises a plurality of columns and coil windings, the columns are arranged around the axis of the rotating shaft, the coil windings surround the peripheries of the columns, the coil windings generate rotating magnetic fields interacting with the magnets so that the rotating shaft can rotate, the magnets and the columns are arranged at intervals in the axial direction, and the axial distance between the magnets and the columns ranges from 0.1 mm to 2 mm. According to the blood pump, the output power and the load torque of the driving unit of the blood pump can be increased on the basis that the overall radial size of the blood pump is reduced.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and in particular to a blood pump that is percutaneously inserted into a patient's blood vessel. Background Art

[0002] An intravascular blood pump is designed to be inserted percutaneously into a patient's blood vessel, such as an artery or vein in the thigh or armpit, and can be advanced into the patient's heart to function as a left ventricular assist device or a right ventricular assist device. Therefore, an intravascular blood pump may also be referred to as an intracardiac blood pump.

[0003] The intravascular blood pump mainly includes an impeller and a motor that drives the impeller to rotate. When the impeller rotates, blood is transported from the blood inlet to the blood outlet of the blood pump. Specifically, the motor generates a rotating magnetic field when it is working, and a magnet that interacts with the rotating magnetic field is provided on the impeller to make the impeller rotate around its axis. However, the magnet on the impeller will increase the weight of the impeller and reduce the pumping efficiency of the impeller; furthermore, the size and shape design of the impeller will be limited by the magnet on it, which increases the difficulty of processing the impeller. Summary of the invention

[0004] In view of at least one of the above-mentioned drawbacks, it is necessary for the present invention to provide a blood pump with high pumping efficiency.

[0005] The present invention provides a blood pump, comprising a sleeve, an impeller arranged in the sleeve, and a driving unit for rotating the impeller, wherein the sleeve has a blood flow inlet and a blood flow outlet, the driving unit comprises a housing, and a rotor and a stator arranged in the housing, the proximal end of the sleeve is connected to the housing, the rotor comprises a rotating shaft, the rotating shaft extends outside the housing and is connected to the impeller; the rotor further comprises at least one magnet mounted on the rotating shaft;

[0006] The stator includes a plurality of columns arranged around the axis of the rotating shaft, and a coil winding around the outer circumference of each column, the coil winding generates a rotating magnetic field that interacts with the magnet to rotate the rotating shaft, the magnet and the column are axially spaced apart, and the axial spacing between the magnet and the column is 0.1 mm to 2 mm.

[0007] In the blood pump of the present invention, the rotor further comprises at least one flywheel disposed on the rotating shaft, and the magnet is fixed on the flywheel.

[0008] In the blood pump of the present invention, the flywheel is a disc-shaped structure, and the magnet is mounted on a side of the flywheel facing the stator.

[0009] In the blood pump of the present invention, a positioning structure is provided at a position of the housing close to the flywheel, and the connecting wire of the coil winding is fixed in the positioning structure.

[0010] In the blood pump of the present invention, the column includes a rod portion and a head portion fixed to one end of the rod portion;

[0011] The stator further comprises a back plate, which is connected to an end of the rod portion away from the head portion, and a first mounting hole for the rotating shaft to pass through is provided on the back plate.

[0012] In the blood pump of the present invention, the rotor comprises a first magnet and a second magnet arranged on the rotating shaft in an axially spaced relationship, and the column is located between the first magnet and the second magnet;

[0013] The column includes a rod portion, and a first head portion and a second head portion respectively arranged at two ends of the rod portion, the first magnet is opposite to the first head portion, and the second magnet is opposite to the second head portion.

[0014] In the blood pump of the present invention, the housing includes a first housing sleeved outside the distal end of the rotor, a second housing sleeved outside the proximal end of the rotor, and a third housing sleeved outside the stator;

[0015] Two ends of the third shell are connected to the first shell and the second shell respectively; a through hole is provided in the first shell, and the rotating shaft extends through the through hole to the outside of the first shell and is fixedly connected to the impeller.

[0016] In the blood pump of the present invention, the driving unit further comprises a distal bearing and a proximal bearing respectively connected to the rotating shaft, and a control member electrically connected to the coil winding;

[0017] The distal bearing is fixed in the first shell, and the proximal bearing is fixed in the second shell; the control member is fixed in the first shell and / or the second shell, and a second mounting hole is provided on the control member, and the rotating shaft passes through the second mounting hole.

[0018] In the blood pump of the present invention, the first housing is provided with a first mounting groove, a first limiting groove and the through hole that are interconnected;

[0019] The magnet is rotatably accommodated in the first installation groove, and the distal bearing is fixed in the first limiting groove.

[0020] In the blood pump of the present invention, a second mounting groove, a second limiting groove, a third limiting groove and a connecting hole are provided in the second housing;

[0021] The back plate of the stator is fixed in the second mounting groove, or the magnet is rotatably accommodated in the second mounting groove; the control component is fixed in the second limiting groove, the proximal bearing is fixed in the third limiting groove, and the wire electrically connected to the control component passes through the connecting hole.

[0022] In the blood pump of the present invention, the magnet is composed of a plurality of magnetic units arranged around the axis of the rotating shaft, and two adjacent magnetic units are arranged at intervals.

[0023] In summary, the implementation of the blood pump of the present invention has the following beneficial effects: Compared with directly setting the magnet on the impeller, the present application sets the magnet on the rotating shaft, so that the axial spacing between the magnet and the stator is not affected by other components, especially the axial spacing between the impeller and the housing, and the thickness of the housing, so that it is easy to obtain a smaller axial spacing between the magnet and the stator. When the axial spacing between the magnet and the column of the stator becomes smaller, the magnetic density between the magnet and the column will increase, and the output power and torque of the drive unit will increase accordingly. Therefore, the present application sets the magnet and the column on the rotating shaft along the axial interval, and sets the axial spacing between the magnet and the column to 0.1mm~2mm, so that there is a larger magnetic density between the two, and the output power of the drive unit is increased. In addition, since the magnet is set on the rotating shaft, the size and shape design of the impeller of the present application is not affected by the magnet, the design of the impeller is more flexible, and the processing difficulty of the impeller is reduced.

[0024] In addition, the present invention arranges the magnet and the column in an axially spaced manner, and uses the axial magnetic flux direct drive method to drive the shaft to rotate, which can reduce the radial size of the drive unit. That is, the present invention can increase the output power and load torque of the drive unit on the basis of reducing the overall radial size of the drive unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0026] Figure 1 is a stereoscopic diagram of a blood pump provided by a first embodiment of the present invention;

[0027] Figure 2 yes Figure 1 An exploded view of the blood pump shown;

[0028] Figure 3 yes Figure 1 A cross-sectional view showing the connection between the impeller of the blood pump and the drive unit;

[0029] Figure 4 yes Figure 3 An exploded view of the impeller and drive unit of the blood pump shown;

[0030] Figure 5 yes Figure 3 A schematic structural diagram of a rotor of the drive unit shown;

[0031] Figure 6 yes Figure 5 A schematic diagram of the structure of the rotating shaft and flywheel of the rotor shown;

[0032] Figure 7 yes Figure 3 An exploded view of the stator of the drive unit shown;

[0033] Figure 8 yes Figure 7 A schematic structural diagram of a back plate of the stator shown;

[0034] Fig. 9 yes Figure 3 An exploded view of the housing of the drive unit shown;

[0035] Fig.10 yes Fig. 9 A schematic structural diagram of a second shell of the shell shown;

[0036] Fig.11 is a cross-sectional view of an impeller and a driving unit of a blood pump provided by a second embodiment of the present invention;

[0037] Fig.12 yes Fig.11 An exploded view of the stator and rotor of the drive unit shown;

[0038] Fig.13 yes Fig.12 An exploded view of the stator shown;

[0039] Fig.14 yes Fig.11 An exploded view of the impeller and drive unit is shown;

[0040] Fig.15 yes Fig.11 An exploded view of the housing of the drive unit shown;

[0041] Fig.16 is a cross-sectional view of an impeller and a driving unit of a blood pump provided by a third embodiment of the present invention;

[0042] Fig.17 yes Fig.16 An exploded view of the stator and rotor of the drive unit shown;

[0043] Fig.18 yes Fig.16An exploded view of the impeller and drive unit is shown;

[0044] Fig.19 yes Fig.17 A schematic diagram of the structure of the rotating shaft and flywheel of the rotor shown;

[0045] Fig. 20 yes Fig.16 An exploded view of the housing of the drive unit shown;

[0046] Fig.21 is a cross-sectional view of an impeller and a driving unit of a blood pump provided by a fourth embodiment of the present invention;

[0047] Fig. 22 yes Fig.21 An exploded view of the rotor and stator of the drive unit shown;

[0048] Fig.23 yes Fig. 22 An exploded view of the stator column is shown;

[0049] Fig.24 yes Fig.21 An exploded view of the impeller and drive unit is shown;

[0050] Fig.25 is a cross-sectional view of an impeller and a driving unit of a blood pump provided by a fifth embodiment of the present invention;

[0051] Fig.26 yes Fig.25 Exploded view of the rotor and stator of the drive unit shown. DETAILED DESCRIPTION

[0052] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there can be a central component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there can be a central component at the same time.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0055] In the field of interventional medicine, the end of the instrument closest to the operator is usually defined as the proximal end, and the end farthest from the operator is defined as the distal end.

[0056] See also Figure 1 and Figure 2 The first embodiment of the present invention provides a blood pump 100, which at least includes an impeller 10, a drive unit 20, a sleeve 30 and a catheter 40. The distal end of the catheter 40 is connected to the proximal end of the drive unit 20, and the proximal end of the sleeve 30 is connected to the distal end of the drive unit 20. The impeller 10 is arranged in the sleeve 30 and is rotatably connected to the drive unit 20.

[0057] The conduit 40 is used to accommodate supply lines, such as cleaning lines, and wires electrically connected to the drive unit 20. The sleeve 30 is provided with a blood flow inlet 31 and a blood flow outlet 32. When the impeller 10 is working, blood enters the sleeve 30 from the blood flow inlet 31 and is discharged from the blood flow outlet 32 ​​along the blood flow channel in the sleeve 30.

[0058] See also Figure 3 The driving unit 20 at least includes a housing 21 , and a rotor 22 and a stator 23 arranged in the housing 21 .

[0059] The rotor 22 includes a rotating shaft 221 and a magnet 223 mounted on the rotating shaft 221. The distal end of the rotating shaft 221 extends outside the housing 21 and is fixedly connected to the impeller 10, and the magnet 223 is located inside the housing 21.

[0060] The stator 23 includes a plurality of columns 231 arranged around the axis of the rotating shaft 221, and a coil winding 232 around the outer periphery of each column 231, and the coil winding 232 generates a rotating magnetic field that interacts with the magnet 223 to rotate the rotating shaft 221. The magnet 223 and the column 231 are spaced apart in the axial direction, and the axial spacing between the magnet 223 and the column 231 is 0.1 mm to 2 mm, preferably 0.1 mm to 0.5 mm.

[0061] It should be noted that when the end face of the magnet 223 or the column 231 is an inclined surface or a non-flat surface, the "axial spacing" between the magnet 223 and the column 231 here refers to the axial distance between the nearest point of the magnet 223 and the farthest point of the column 231; or, the axial distance between the farthest point of the magnet 223 and the nearest point of the column 231.

[0062] Compared with setting the magnet directly on the impeller, the present application sets the magnet 223 on the rotating shaft 221, so that the axial spacing between the magnet 223 and the stator 23 is not affected by other components, especially the axial spacing between the impeller 10 and the housing 21 of the drive unit 20, and the thickness of the housing 21, so that it is easy to obtain a smaller axial spacing between the magnet 223 and the stator 23. When the axial spacing between the magnet 223 and the column 231 of the stator 23 becomes smaller, the magnetic density between the magnet 223 and the column 231 will increase, and the output power of the drive unit 20 will increase accordingly. Therefore, the present application sets the magnet 223 and the column 231 on the rotating shaft 221 at an axial interval, and sets the axial spacing between the magnet 223 and the column 231 at 0.1mm to 2mm, so that there is a larger magnetic density between the two, and the output power of the drive unit 20 is increased. Furthermore, since the magnet 223 is disposed on the rotating shaft 221 , the size and shape design of the impeller 10 of the present application are not affected by the magnet, the design of the impeller 10 is more flexible, and the processing difficulty of the impeller 10 is reduced.

[0063] In addition, the present application arranges the magnet 223 and the column 231 in an axially spaced manner, and uses the axial magnetic flux direct drive method to drive the rotating shaft 221 to rotate, which can reduce the radial size of the drive unit 20. That is, the present application can increase the output power and load torque of the drive unit 20 on the basis of reducing the overall radial size of the drive unit 20.

[0064] The structure of the driving unit 20 will be described in detail below.

[0065] See also Figure 4 The driving unit 20 includes a housing 21 , and a rotor 22 , a stator 23 , a distal bearing 24 , a proximal bearing 25 and a control member 26 which are respectively installed in the housing 21 .

[0066] See also Figure 5 The rotor 22 includes a rotating shaft 221 , a flywheel 222 , and a magnet 223 .

[0067] The distal end of the rotating shaft 221 extends to the outside of the housing 21 and is fixedly connected to the impeller 10. The flywheel 222 is fixed on the rotating shaft 221 and extends radially toward a side away from the rotating shaft 221. The magnet 223 is fixed on a side of the flywheel 222 close to the stator 23. The rotating magnetic field generated by the stator 23 interacts with the magnet 223, so that the magnet 223 and the flywheel 222 fixedly connected to the magnet 223 rotate together, thereby driving the rotating shaft 221 and the impeller 10 to rotate.

[0068] The magnet 223 is composed of a plurality of magnetic units, and two adjacent magnetic units are arranged at intervals. If the gap between two adjacent magnetic units is too small, the innermost magnetic field extending in the two adjacent magnetic units cannot interact with the rotating magnetic field generated by the stator 23, affecting the rotation speed of the rotating shaft 221. Therefore, the present application arranges two adjacent magnetic units at intervals, and adjusts the size of the gap between the two adjacent magnetic units according to the size of the axial spacing between the magnet 223 and the stator 23.

[0069] In this embodiment, the magnet 223 is composed of six magnetic units, and the six magnetic units are arranged at intervals around the axis of the rotating shaft 221. Each magnetic unit is a fan-shaped magnet, so that the magnet 223 is roughly a circular ring structure. It can be understood that in other embodiments, the magnet 223 can also be composed of more or fewer magnetic units, such as two, four, eight or ten.

[0070] See also Figure 6 The flywheel 222 includes a main body 2221 and a mounting boss 2222 .

[0071] The main body 2221 is a substantially disk-shaped structure, preferably a circular disk structure, which is fixed on the rotating shaft 221 and extends radially toward a side away from the rotating shaft 221. The magnet 223 is fixed on a side of the main body 2221 facing the stator 23.

[0072] The mounting boss 2222 is located on the side of the main body 2221 facing the stator 23, and the magnet 223 is arranged around the outer periphery of the mounting boss 2221. Specifically, one end of the mounting boss 2222 is fixed on the main body 2221, and the other end extends toward a side away from the main body 2221. The outer diameter of the mounting boss 2222 is larger than the outer diameter of the rotating shaft 221, but smaller than the outer diameter of the main body 2221. By arranging the mounting boss 2221 on the main body 2221, it is convenient to assemble and position the magnet 223, so that the magnet 223 is better fixed on the main body 2221.

[0073] In the present application, a flywheel 222 is arranged on the rotating shaft 221 , and a magnet 223 is fixed on the flywheel 222 . The rotating shaft 221 is driven to rotate by the flywheel 222 , so that the connection strength between the magnet 223 and the rotating shaft 221 can be increased, and the rotation stability of the rotating shaft 221 can be improved.

[0074] In this embodiment, the flywheel 222 and the rotating shaft 221 are an integrally formed structure. In other embodiments, the flywheel 222 can also be fixedly connected to the rotating shaft 221 in other ways, such as bonding, welding, etc.

[0075] It is understandable that the flywheel 222 of the present embodiment is only used as an example and does not limit the present application. The flywheel 222 of the present application can also be other structures, as long as the magnet 223 can be fixed on the rotating shaft 221. For example, in other embodiments, the flywheel 222 only includes a main body 2221, and the magnet 223 is fixed on the side of the main body 2221 facing the stator 23; or, the flywheel 222 only includes a mounting boss 2222, and the magnet 223 is fixed on the outer peripheral surface of the mounting boss 2222; or, the flywheel 222 is composed of a plurality of support rods arranged at intervals around the axis of the rotating shaft 221, one end of each support rod is fixed on the rotating shaft 221, and the other end extends in a radial direction toward the first side away from the rotating shaft 221, the number of support rods is the same as the number of magnetic units, and a magnetic unit is fixed on the side of each support rod close to the stator 23.

[0076] It is also understandable that in other embodiments, the flywheel 222 may not be provided on the rotating shaft 221, and the magnet 223 may be directly fixed on the rotating shaft 221; or a fixing groove may be provided on the rotating shaft 221, and the magnet 223 may be assembled in the fixing groove.

[0077] See also Figure 7 The stator 23 includes a plurality of columns 231 arranged around the axis of the rotating shaft 221, a coil winding 232 around the outer periphery of each column 231, and a back plate 233. The center of the stator 23 has an axially penetrating passage, and the rotating shaft 221 can rotatably pass through the passage.

[0078] Among them, a plurality of columns 231 are arranged around the axis of the rotating shaft 221 to form a ring-like structure, and the rotating shaft 221 passes through the center of the ring-like structure. The columns 231 serve as magnetic cores and are made of soft magnetic materials, such as cobalt steel. Each column 231 includes a rod 2311 and a head 2312 fixed at one end of the rod 2311, and the head 2312 is magnetically coupled to the magnet 223.

[0079] The coil winding 232 includes a plurality of coils 2321, the number of which is the same as the number of the poles 231, and a corresponding coil 2321 surrounds the outer circumference of each rod portion 2311. The coil winding 232 is sequentially controlled by a control unit (not shown) to create a rotating magnetic field for driving the magnet 223.

[0080] The back plate 233 is connected to the end of the rod 2311 away from the head 2312 to close the magnetic flux loop, increase the magnetic flux, improve the coupling ability, and help the blood pump increase the output power of the drive unit 20 on the basis of reducing the overall radial size. The back plate 233 is also made of soft magnetic material, such as cobalt steel, etc., which is the same as the material of the column 231.

[0081] Combination Figure 8As shown, the back plate 233 is provided with a first mounting hole 2331, and the first mounting hole 2331 is in clearance fit with the rotating shaft 221, and the rotating shaft 221 can rotatably pass through the first mounting hole 2331. The back plate 233 is also provided with a avoidance groove 2332 for the connecting wire of the coil winding 232 to pass through. The back plate 233 is also provided with a through hole 2333 that penetrates along the axial direction. During assembly, glue can be poured between the back plate 233 and the rod 2311 through the through hole 2333 to fix the rod 2311 and the back plate 233. Figure 8 In the illustrated embodiment, the through hole 2333 is a countersunk hole structure, and the number of the through holes 2333 is the same as that of the rod 2311, and each through hole 2333 corresponds to the position of the rod 2311. It is understandable that in other embodiments, the through hole 2333 may also be a hole structure of other forms, as long as it can penetrate the back plate 233; or, the back plate 233 is not provided with a through hole 2333, and the rod 2311 is fixedly connected to the back plate 233 by welding or other connection methods.

[0082] See also Fig. 9 The housing 21 includes a first housing 211 , a second housing 212 and a third housing 213 .

[0083] The first housing 211 is sleeved outside the distal end of the rotor 22 , the second housing 212 is sleeved outside the proximal end of the rotor 22 , and the third housing 213 is sleeved outside the stator 23 .

[0084] The first housing 211 is generally a structure with one end open and the other end closed, and is sleeved outside the distal end of the rotor 22 . The distal end of the rotating shaft 221 passes through the first housing 211 and is connected to the impeller 10 .

[0085] Along the direction from the proximal end to the distal end of the first shell 211 , the first shell 211 is provided with a first connecting groove 2110 , a first mounting groove 2111 , a first limiting groove 2112 and a through hole 2113 which are interconnected.

[0086] The first connection groove 2110 is used to connect with the third housing 213. During assembly, the distal connection member 2131 of the third housing 213 is inserted into the first connection groove 2110, so that the first housing 211 and the third housing 213 are fixedly connected.

[0087] The first mounting groove 2111 is used to accommodate the magnet 223 and the flywheel 222, and the magnet 223 and the flywheel 222 are rotatably accommodated in the first mounting groove 2111. The inner diameter of the first mounting groove 2111 is larger than the outer diameter of the magnet 223 and the flywheel 222, so as to prevent the magnet 223 and the flywheel 222 from touching the inner wall of the first mounting groove 2111 when rotating.

[0088] The first limiting groove 2112 is used to accommodate the distal bearing 24, and the distal bearing 24 is fixed in the first limiting groove 2112. The distal bearing 24 abuts against the side wall of the first limiting groove 2112 to prevent the distal bearing 24 from moving in the radial direction. Figure 6 As shown, a distal limiting portion 2211 is provided on the rotating shaft 221, and the distal limiting portion 2211 cooperates with the bottom wall of the first limiting groove 2112 to limit the distal bearing 24 between the distal limiting portion 2211 and the first limiting groove 2112 to prevent the distal bearing 24 from moving axially.

[0089] The through hole 2113 is used for the distal end of the rotating shaft 221 to pass through. The through hole 2113 is clearance-matched with the rotating shaft 221 , and the distal end of the rotating shaft 221 extends through the through hole 2113 to the outside of the housing 21 and is fixedly connected to the impeller 10 .

[0090] See also Fig. 9 and Fig.10 The second housing 212 is generally a structure with one end open and the other end closed, and is sleeved outside the proximal end of the rotor 22 .

[0091] Along the direction from the distal end to the proximal end of the second shell 212 , the second shell 212 is provided with a second connecting groove 2120 , a second mounting groove 2121 , a second limiting groove 2122 , a third limiting groove 2123 and a connecting hole 2124 which are interconnected.

[0092] The second connection groove 2120 is used to connect with the third housing 213. During assembly, the proximal connection member 2132 of the third housing 213 is inserted into the second connection groove 2110, so that the second housing 212 and the third housing 213 are fixedly connected.

[0093] The second mounting groove 2121 is used to receive the back plate 233, and the back plate 233 is fixed in the second mounting groove 2121. The side wall of the second mounting groove 2121 is provided with a clamping groove 2126, and the clamping groove 2126 is recessed from the side wall of the second mounting groove 2121 toward the outer surface of the second housing 212. Figure 8 As shown, the side wall of the back plate 233 is provided with a limiting protrusion 2334. During assembly, the limiting protrusion 2334 of the back plate 233 is held in the clamping groove 2126 to prevent the back plate 233 from rotating in the second installation groove 2121.

[0094] The second limiting groove 2122 is used to accommodate the control member 26, and the control member 26 is fixed in the second limiting groove 2122. In this embodiment, the control member 26 includes two PCB boards superimposed along the axial direction, and the connecting wires of the coil winding 232 are respectively connected to the corresponding PCB boards. A second mounting hole is provided on each PCB board, and the second mounting hole is clearance-matched with the rotating shaft 221, and the rotating shaft 221 can rotatably pass through the second mounting hole. It can be understood that this embodiment does not limit the specific number of PCB boards, and one, three or more PCB boards can be provided as needed.

[0095] The third limiting groove 2123 is used to accommodate the proximal bearing 25, and the proximal bearing 25 is fixed in the third limiting groove 2123. The proximal bearing 25 abuts against the side wall of the third limiting groove 2123 to prevent the proximal bearing 25 from moving in the radial direction. Figure 6 As shown, a proximal limiting portion 2212 is provided on the rotating shaft 221, and the proximal limiting portion 2212 cooperates with the bottom wall of the third limiting groove 2123 to limit the proximal bearing 25 between the proximal limiting portion 2212 and the third limiting groove 2123 to prevent the proximal bearing 25 from moving axially.

[0096] The connection hole 2124 is used for supply lines (e.g., cleaning lines and wires electrically connected to the PCB board) in the conduit 40 to pass through. Fig.10 In the illustrated embodiment, there are three connecting holes 2124 , and each connecting hole 2124 penetrates the second housing 212 along the axial direction.

[0097] See Fig. 9 The third housing 213 is generally a structure with two ends opened, and is sleeved outside the stator 23 .

[0098] The third housing 213 is provided with a distal connector 2131 and a proximal connector 2132 at both ends. When assembling, the distal connector 2131 is inserted into the first connection slot 2110 of the first housing 211, and the proximal connector 2132 is inserted into the second connection slot 2120 of the second housing 212.

[0099] It is understandable that the housing 21 of the present embodiment is only used as an example and does not limit the present application. The housing 21 of the present application may also be other structures, as long as it can be sleeved outside the stator 23 and the rotor 22 to seal the stator 23 and the rotor 22. For example, in other embodiments, the housing 21 includes a first housing 211 sleeved outside the distal end of the rotor 22, a second housing 212 sleeved outside the proximal end of the rotor 22, and a third housing 213 sleeved outside the stator 23. The third housing 213 and the second housing 212 are an integral structure, or the third housing 213 and the first housing 211 are an integral structure.

[0100] See also Fig.11 and Fig.12 The second embodiment of the present invention provides a blood pump 100, which includes at least an impeller 10, a drive unit, a sleeve and a catheter. The drive unit includes at least a housing 21, and a rotor 22 and a stator 23 arranged in the housing 21. The rotor 22 includes a rotating shaft 221, which extends outside the housing 21 and is connected to the impeller 10.

[0101] The second embodiment differs from the first embodiment in that the rotor 22 includes two flywheels 222 arranged on the rotating shaft 221 in an axially spaced manner, each flywheel 222 is provided with a magnet 223 , and the stator 23 is arranged around the rotating shaft 221 and located between the two magnets 223 .

[0102] Specific reference Fig.12 The rotor 22 includes a rotating shaft 221, and a first flywheel 222a and a second flywheel 222b which are axially spaced and arranged on the rotating shaft 221. The first flywheel 222a is equipped with a first magnet 223a, and the second flywheel 222b is equipped with a second magnet 223b.

[0103] See also Fig.13 The stator 23 includes a plurality of columns 231 arranged around the axis of the rotating shaft 221, and a coil winding 232 surrounding the outer periphery of each column 231. The rotating magnetic field generated by the coil winding 232 interacts with the first magnet 223a and the second magnet 223b respectively to rotate the rotating shaft 221.

[0104] Compared with the first embodiment, the rotor 22 of the second embodiment includes two magnets 223. The rotating magnetic field generated by the stator 23 interacts with the two magnets 223 respectively. The two magnets 223 drive the rotating shaft 221 to rotate, which can greatly increase the rotation speed of the rotating shaft 221 and increase the output power and load torque of the drive unit. In addition, the stator 23 and the two magnets 223 are arranged at intervals along the axial direction, and the rotating shaft 221 is driven to rotate by direct axial magnetic flux drive, which can increase the output power and load torque of the drive unit 20 without increasing the overall radial size of the drive unit 20.

[0105] The structure of the driving unit 20 will be described in detail below.

[0106] See also Fig.14 The driving unit 20 includes a housing 21 , and a rotor 22 , a stator 23 , a distal bearing 24 , a proximal bearing 25 and a control member 26 which are respectively installed in the housing 21 .

[0107] Please refer again Fig.12 The rotor 22 includes a rotating shaft 221, a first flywheel 222a, a second flywheel 222b, a first magnet 223a and a second magnet 223b.

[0108] The distal end of the rotating shaft 221 extends to the outside of the housing 21 and is fixedly connected to the impeller 10. The first flywheel 222a and the second flywheel 222b are arranged on the rotating shaft 221 at intervals along the axial direction, and the stator 23 is located between the first flywheel 222a and the second flywheel 222b. The first magnet 233a is fixed to a side of the first flywheel 222a close to the stator 23, and the second magnet 233b is fixed to a side of the second flywheel 222b close to the stator 23.

[0109] The specific structures of the magnets and the flywheel of the rotor 22 of the second embodiment are the same as those of the first embodiment, and are not described in detail herein.

[0110] Please refer again Fig.13 The stator 23 includes a plurality of columns 231 arranged around the axis of the rotating shaft 221, and a coil winding 232 around the outer periphery of each column 231. The center of the stator 23 has a channel penetrating in the axial direction, and the rotating shaft 221 can rotatably pass through the channel.

[0111] Compared with the first embodiment, the stator 23 of the second embodiment does not include a back plate, and the column 231 includes a rod portion 2311, and a first head portion 2312a and a second head portion 2312b respectively disposed at both ends of the rod portion 2311. The first head portion 2312a is opposite to the first magnet 223a, and the second head portion 2312b is opposite to the second magnet 223b. The column 231 serves as a magnetic core, which is made of a soft magnetic material, such as cobalt steel.

[0112] The axial distance between the first magnet 223a and the column 231 is 0.1 mm to 2 mm, preferably 0.1 mm to 0.5 mm; the axial distance between the second magnet 223b and the column 231 is 0.1 mm to 2 mm, preferably 0.1 mm to 0.5 mm.

[0113] The coil winding 232 includes a plurality of coils 2321, the number of which is the same as the number of the poles 231, and a coil 2321 surrounds the outer circumference of each rod portion 2311. The coil winding 232 is sequentially controlled by a control unit (not shown) to create a rotating magnetic field for driving the two magnets.

[0114] See also Fig.15 The housing 21 includes a first housing 211 , a second housing 212 and a third housing 213 .

[0115] The first housing 211 is sleeved outside the distal end of the rotor 22, the second housing 212 is sleeved outside the proximal end of the rotor 22, and the third housing 213 is sleeved outside the stator 23. Since the structures of the first housing 211 and the third housing 213 of the second embodiment are the same as those of the first embodiment, the specific structures of the first housing 211 and the third housing 213 are not repeated here.

[0116] The second housing 212 is generally a structure with one end open and the other end closed. From the distal end to the proximal end of the second housing 212, the second housing 212 is provided with a second connecting groove 2120, a second mounting groove 2121, a second limiting groove 2122, a third limiting groove 2123 and a connecting hole.

[0117] The second mounting groove 2121 is used to accommodate the second flywheel 222b and the second magnet 223b, and the second flywheel 222b and the second magnet 223b are rotatably accommodated in the second accommodation groove. The inner diameter of the second mounting groove 2121 is larger than the outer diameter of the second flywheel 222b and the second magnet 223b, so as to prevent the second flywheel 222b and the second magnet 223b from touching the inner wall of the second mounting groove 2121 when rotating.

[0118] Similar to the first embodiment, the second connection groove 2120 is used to connect with the third housing 213. The second limiting groove 2122 is used to accommodate the control member 26, and the control member 26 is fixed in the second limiting groove 2122. The third limiting groove 2123 is used to accommodate the proximal bearing 25, and the proximal bearing 25 is fixed in the third limiting groove 2123. The connection hole is used for the supply line (for example, the cleaning line, and the wire electrically connected to the PCB board) in the catheter 40 to pass through, and the connection hole penetrates the second housing 212 along the axial direction.

[0119] See also Fig.16 and Fig.17 The third embodiment of the present invention provides a blood pump 100, which includes at least an impeller 10, a drive unit, a sleeve and a catheter. The drive unit includes at least a housing 21, and a rotor 22 and a stator 23 arranged in the housing 21. The rotor 22 includes a rotating shaft 221, which extends outside the housing 21 and is connected to the impeller 10.

[0120] The difference between the third embodiment and the first embodiment is that the rotor 22 includes a flywheel 222, and two first magnets 223a and second magnets 223b respectively arranged on the flywheel 222; the stator 23 includes a first stator 23a and a second stator 23b respectively arranged on both sides of the flywheel 222 along the axial direction, the rotating magnetic field generated by the first stator 23a interacts with the first magnet 223a to rotate the rotating shaft 221, and the rotating magnetic field generated by the second stator 23b interacts with the second magnet 223b to rotate the rotating shaft 221.

[0121] The first stator 23a and the second stator 23b have the same structure, both including a plurality of columns 231 and a coil winding 232 around the outer circumference of each column 231. The rotating magnetic fields generated by the coil windings 232 of the two stators interact with the corresponding magnets to rotate the shaft 221. The axial spacing between the column 231 of the first stator 23a and the first magnet 223a is 0.1mm-2mm, preferably 0.1mm-0.5mm; the axial spacing between the column 21 of the second stator 23b and the second magnet 223b is 0.1mm-2mm, preferably 0.1mm-0.5mm.

[0122] Compared with the first embodiment, the driving unit 20 of the third embodiment has two stators, and the two stators act on the corresponding magnets on the flywheel 222 respectively, so that the two stators drive the flywheel 222 to rotate at the same time, thereby greatly improving the rotation speed of the rotating shaft 221 and increasing the output power and load torque of the driving unit 20. In addition, the two stators are arranged on the rotating shaft 221 along the axial direction, which will not increase the radial size of the driving unit 20. That is, this embodiment can greatly increase the output power and load torque of the driving unit 20 without increasing the overall radial size of the driving unit 20.

[0123] The structure of the driving unit 20 will be described in detail below.

[0124] See also Fig.18 The driving unit 20 includes a housing 21 , and a rotor 22 , a first stator 23 a , a second stator 23 b , a distal bearing 24 , a proximal bearing 25 and a control member 26 , which are respectively installed in the housing 21 .

[0125] The rotor 22 includes a rotating shaft 221 , a flywheel 222 , a first magnet 223 a and a second magnet 223 b .

[0126] See also Fig.19 The flywheel 222 includes a main body 2221, a first mounting boss 2222a and a second mounting boss 2222b.

[0127] The main body 2221 is a disk-shaped structure, preferably a circular disk structure, which is fixed on the rotating shaft 221 and extends radially toward a side away from the rotating shaft 221. The first magnet 223a and the second magnet 223b are respectively fixed on both sides of the main body 2221 along the axial direction.

[0128] The first mounting boss 2222a and the second mounting boss 2222b are axially arranged on both sides of the main body 2221, the first magnet 223a is arranged around the outer periphery of the first mounting boss 2222a, and the second magnet 223b is arranged around the outer periphery of the second mounting boss 2222b. The structure of the two magnets in the third embodiment is the same as that of the magnets in the first embodiment, and will not be repeated here.

[0129] Similarly, the structure of each stator of the third embodiment is the same as that of the stator of the first embodiment, and both include a plurality of columns 231 arranged around the axis of the rotating shaft 221, a coil winding 232 around the outer circumference of each column 231, and a back plate 233. Therefore, the specific structures of the two stators are not repeated here.

[0130] See also Fig. 20 The housing 21 includes a first housing 211 , a second housing 212 , two third housings 213 and a fourth housing 214 .

[0131] Among them, the first housing 211 is sleeved outside the distal end of the rotor 22, the second housing 212 is sleeved outside the proximal end of the rotor 22, the two third housings 213 are sleeved outside the two stators respectively, and the fourth housing 214 is located between the two third housings 213 and sleeved outside the flying disc 222. Since the structures of the second housing 212 and the third housing 213 of the third embodiment are the same as those of the first embodiment, the specific structures of the second housing 212 and the third housing 213 are not repeated here.

[0132] The first housing 211 is generally a structure with one end open and the other end closed. From the proximal end to the distal end of the first housing 211, the first housing 211 is provided with a first connecting groove 2110, a first mounting groove 2111, a first limiting groove 2112, a fourth limiting groove 2114 and a through hole 2113 that are interconnected.

[0133] The first mounting groove 2111 is used to receive the back plate 233 of the first stator 23a, and the back plate 233 is fixed in the first mounting groove 2111. The side wall of the first mounting groove 2111 is provided with a positioning groove 2116, and the positioning groove 2116 is recessed from the side wall of the first mounting groove 2111 toward the outer surface of the first housing 211. Figure 8 As shown, the side wall of the back plate 233 is provided with a limiting protrusion 2334. During assembly, the limiting protrusion 2334 of the back plate 233 is held in the positioning groove 2116 to prevent the back plate 233 from rotating in the first installation groove 2111.

[0134] The fourth limiting groove 2114 is used to accommodate the control member 26, and the control member 26 is fixed in the fourth limiting groove 2114. In this embodiment, the control member 26 includes three PCB boards, and the connecting wires of the coil winding 232 are respectively connected to the corresponding PCB boards. Among them, one PCB board is fixed in the fourth limiting groove 2114 of the first housing 211, and the other two PCB boards are axially stacked and fixed in the second housing 212. It can be understood that this embodiment does not limit the specific number of PCB boards, and one, four or more PCB boards can be set as needed.

[0135] Similar to the first embodiment, the first connection groove 2110 is used to connect with the third housing 213. The first limiting groove 2112 is used to accommodate the distal bearing 24, and the distal bearing 24 is fixed in the first limiting groove 2112. The through hole 2113 is used for the distal end of the rotating shaft 221 to pass through, and the distal end of the rotating shaft 221 extends through the through hole 2113 to the outside of the housing 21 and is fixedly connected with the impeller 10.

[0136] The fourth housing 214 is generally a structure with two ends open, and is sleeved outside the flywheel 222. Connectors that match the third housing 213 are respectively provided at both ends of the fourth housing 214, so that the fourth housing 214 is fixedly connected to the third housing 213 located on both sides thereof.

[0137] The inner wall of the fourth housing 214 is provided with a positioning structure 2141, and the connecting wire of the coil winding 232 is fixed in the positioning structure 2141. By fixing the connecting wire of the coil winding 232 on the positioning structure 2141, the connecting wire of the coil winding 232 can be kept away from the flywheel 222, and the connecting wire can be prevented from moving randomly, thereby preventing the flywheel 222 from damaging the connecting wire when rotating at a high speed.

[0138] exist Fig. 20 In the illustrated embodiment, the positioning structure 2141 is a slot structure extending in the axial direction, and the connecting wire of the coil winding 232 is clamped in the slot structure to prevent the connecting wire from moving at will. It is understandable that the present embodiment does not limit the specific structure of the positioning structure 2141, as long as it can prevent the connecting wire of the coil winding 232 from being damaged by the flywheel 222. For example, in other embodiments, the positioning structure 2141 is two hole structures arranged at intervals, and the connecting wire of the coil winding 232 extends to the outside of the fourth housing 214 through one of the hole structures. After the connecting wire passes over the flywheel 222, it extends to the inside of the fourth housing 214 through the other hole structure.

[0139] It is understandable that the housing 21 of the present embodiment is only used as an example and does not limit the present application. The housing 21 of the present application may also be other structures, as long as it can be sleeved outside the stator 23 and the rotor 22 to seal the stator 23 and the rotor 22. For example, in other embodiments, the housing 21 includes a first housing 211 sleeved outside the distal end of the rotor 22, a second housing 212 sleeved outside the proximal end of the rotor 22, and a fifth housing sleeved outside the two stators and the flywheel at the same time.

[0140] See also Fig.21 and Fig. 22 The fourth embodiment of the present invention provides a blood pump 100, which includes at least an impeller 10, a drive unit 20, a sleeve and a catheter. The drive unit includes at least a housing 21, and a rotor 22 and a stator 23 arranged in the housing 21. The rotor 22 includes a rotating shaft 221, which extends outside the housing 21 and is connected to the impeller 10.

[0141] The fourth embodiment is different from the second embodiment in that the rotor 22 includes three flywheels arranged on the rotating shaft 221 at intervals in the axial direction, namely, a first flywheel 222a, a second flywheel 222b and a third flywheel 222c. The first flywheel 222a is equipped with a first magnet 223a, the second flywheel 222b is equipped with a second magnet 223b and a third magnet 223c, respectively, and the third flywheel 222c is equipped with a fourth magnet 223d.

[0142] The stator 23 includes two parts, namely, a first stator 23a and a second stator 23b. The first stator 23a is located between the first magnet 223a and the second magnet 223b. The rotating magnetic field generated by the first stator 23a interacts with the first magnet 223a and the second magnet 223b respectively to rotate the shaft 221. The second stator 23b is located between the third magnet 223c and the fourth magnet 223d. The rotating magnetic field generated by the second stator 23b interacts with the third magnet 223c and the fourth magnet 223d respectively to rotate the shaft 221.

[0143] Specifically, each stator 23 includes a plurality of columns 231 arranged around the axis of the rotating shaft 221, and a coil winding 232 surrounding the outer circumference of each column 231. Fig.23 As shown, the column 231 includes a rod portion 2311 , and a first head portion 2312 a and a second head portion 2312 b respectively disposed at two ends of the rod portion 2311 .

[0144] The axial spacing between the column 231 of the first stator 23a and the first magnet 223a or / and the second magnet 223b is 0.1mm-2mm, preferably 0.1mm-0.5mm. The axial spacing between the column 231 of the second stator 23b and the third magnet 223c or / and the fourth magnet 223d is 0.1mm-2mm, preferably 0.1mm-0.5mm.

[0145] Compared with the second embodiment, the fourth embodiment uses two stators 23 to drive three flywheels 222 to rotate, which can greatly increase the output power and load torque of the drive unit 20. In addition, the two stators 23 are arranged at intervals along the axial direction, and the flywheel 222 is driven to rotate by axial magnetic flux direct drive, which can increase the output power and load torque of the drive unit 20 without increasing the overall radial size of the drive unit 20.

[0146] Since each stator 23 of the fourth embodiment has the same structure as the stator of the second embodiment, the specific structure of the stator 23 is not described again.

[0147] Likewise, since the structure of the housing 21 of the fourth embodiment is the same as that of the third embodiment, the specific structure of the housing 21 is not described in detail herein.

[0148] See also Fig.25 and Fig.26 The fifth embodiment of the present invention provides a blood pump 100, which includes at least an impeller 10, a drive unit 20, a sleeve and a catheter. The drive unit includes at least a housing 21, and a rotor 22 and a stator 23 arranged in the housing 21. The rotor 22 includes a rotating shaft 221, which extends outside the housing 21 and is connected to the impeller 10.

[0149] The fifth embodiment is different from the second embodiment in that the rotor 22 includes two flywheels spaced apart in the axial direction and arranged on the rotating shaft 221, namely a first flywheel 222a and a second flywheel 222b. The first flywheel 222a is equipped with a first magnet 223a, and the second flywheel 222b is equipped with a second magnet 223b and a third magnet 223c.

[0150] The stator 23 includes two, namely, a first stator 23a and a second stator 23b. The first stator 23a and the second stator 23b are arranged on both sides of the second flywheel 222b in an axially spaced manner. The first stator 23a is located between the first magnet 223a and the second magnet 223b, and the rotating magnetic field generated by the first stator 23a acts on the first magnet 223a and the second magnet 223b respectively to rotate the shaft 221; the second stator 23b is opposite to the third magnet 223c, and the rotating magnetic field generated by the second stator 23b acts on the third magnet 223c to rotate the shaft 221.

[0151] Specifically, the first stator 23a includes a plurality of first columns 231a arranged around the axis of the rotating shaft 221 and a coil winding 232 surrounding the outer periphery of each first column 231a. The first column 231a includes a rod portion, and a first head portion and a second head portion respectively disposed at both ends of the rod portion.

[0152] The second stator 23b includes a plurality of second posts 231b arranged around the axis of the rotating shaft 221, a coil winding 232 surrounding the outer circumference of each second post 231b, and a back plate 233. The second post 231b includes a rod portion and a head connected to one end of the rod portion, and the back plate 233 is connected to one end of the rod portion 2311 away from the head.

[0153] The axial distance between the first column 231a and the first magnet 223a or / and the second magnet 223b is 0.1 mm to 2 mm, preferably 0.1 mm to 0.5 mm. The axial distance between the second column 231b and the third magnet 223c is 0.1 mm to 2 mm, preferably 0.1 mm to 0.5 mm.

[0154] Compared with the second embodiment, the fifth embodiment uses two stators 23 to drive two flywheels 222 to rotate, which can greatly increase the output power and load torque of the drive unit 20. In addition, the two stators 23 are arranged at intervals along the axial direction, and the flywheel 222 is driven to rotate by axial magnetic flux direct drive, which can increase the output power and load torque of the drive unit 20 without increasing the overall radial size of the drive unit 20.

[0155] Since the structure of the first stator 23a of the fifth embodiment is the same as that of the second embodiment, and the structure of the second stator 23b is the same as that of the first embodiment, the specific structures of the first stator 23a and the second stator 23b are not repeated here.

[0156] Likewise, since the structure of the housing 21 of the fifth embodiment is the same as that of the third embodiment, the specific structure of the housing 21 is not described again.

[0157] It can be understood that, without violating the purpose of the present invention, new technical solutions formed by freely combining the technical solutions in various embodiments are also within the scope of protection to be applied for by the present invention.

[0158] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0159] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A blood pump, the blood pump is used for percutaneous insertion into a patient's blood vessel, the blood pump comprises an impeller and a driving unit for rotating the impeller, the driving unit comprises a housing and a rotor and a stator arranged in the housing, the rotor comprises a rotating shaft, the rotating shaft extends outside the housing and is connected to the impeller; characterized in that: The rotor further comprises at least one magnet mounted on the rotating shaft, and the magnet is located in the housing; The stator includes a plurality of columns arranged around the axis of the rotating shaft, and a coil winding around the outer periphery of each of the columns, the coil winding generating a rotating magnetic field interacting with the magnet to rotate the rotating shaft, the magnet being spaced apart from the column in the axial direction.

2. The blood pump according to claim 1, characterized in that The rotor further comprises at least one flywheel arranged on the rotating shaft, the magnet is fixed on the flywheel, and the magnet and the flywheel fixedly connected to the magnet rotate together.

3. The blood pump according to claim 2, characterized in that The flywheel comprises a main body, the main body is a disc-shaped structure, and the magnet is fixed on a side of the main body facing the stator; The flywheel further comprises a mounting boss, wherein the mounting boss is located on a side of the main body facing the stator, and the magnet surrounds an outer circumference of the mounting boss.

4. The blood pump according to claim 2, characterized in that A positioning structure is provided at a position of the housing close to the flywheel, and the connecting wire of the coil winding is fixed in the positioning structure.

5. The blood pump according to claim 1, characterized in that The column includes a rod portion, and a head portion fixed at one end of the rod portion; The stator further comprises a back plate, which is connected to an end of the rod portion away from the head portion, and a first mounting hole for the rotating shaft to pass through is provided on the back plate.

6. The blood pump according to claim 1, characterized in that The rotor comprises a first magnet and a second magnet which are arranged on the rotating shaft and are spaced apart in the axial direction, and the column is located between the first magnet and the second magnet; The column includes a rod portion, and a first head portion and a second head portion respectively arranged at two ends of the rod portion, the first magnet is opposite to the first head portion, and the second magnet is opposite to the second head portion.

7. The blood pump according to claim 1, characterized in that The rotor also includes a flywheel and two first magnets and a second magnet respectively arranged on the flywheel. The stator includes a first stator and a second stator axially arranged on both sides of the flywheel. The column of the first stator is axially spaced from the first magnet. The rotating magnetic field generated by the first stator interacts with the first magnet to rotate the rotating shaft; the rotating magnetic field generated by the second stator interacts with the second magnet to rotate the rotating shaft.

8. The blood pump according to claim 1, characterized in that The rotor also includes a first flywheel and a second flywheel arranged at an axial interval, the first flywheel is equipped with a first magnet, and the second flywheel is equipped with a second magnet and a third magnet; the stator includes a first stator and a second stator, the first stator and the second stator are arranged on both sides of the second flywheel at an axial interval, the first stator is located between the first magnet and the second magnet, the rotating magnetic field generated by the first stator interacts with the first magnet and the second magnet respectively to rotate the rotating shaft; the second stator is opposite to the third magnet, and the rotating magnetic field generated by the second stator can interact with the third magnet to rotate the rotating shaft.

9. The blood pump according to claim 8, characterized in that The rotor also includes a third flywheel, on which a fourth magnet is mounted. The second stator is located between the third magnet and the fourth magnet. The rotating magnetic field generated by the second stator can also interact with the fourth magnet to rotate the rotating shaft.

10. The blood pump according to claim 1, characterized in that The stator further comprises a back plate, which is located at an end of the column away from the magnet; the back plate has at least one of the following features: The back plate is provided with a first mounting hole, and the rotating shaft rotatably passes through the first mounting hole; The back plate is provided with an avoidance groove, and the avoidance groove can allow the connecting wire of the coil winding to pass through; The back plate is provided with a through hole penetrating in the axial direction, the through hole corresponds to the column, and the through hole can be used for glue to be poured between the back plate and the column; The back plate is made of soft magnetic material.

11. The blood pump according to claim 1, characterized in that The driving unit also has at least one of the following features: The axial spacing between the magnet of the driving unit and the column is 0.1 mm to 2 mm; The driving unit further comprises a distal bearing connected to the rotating shaft, the distal bearing being fixed in the housing, and the rotating shaft passing through the distal bearing; The driving unit further comprises a proximal bearing connected to the rotating shaft, the proximal bearing being fixed in the housing, and the proximal end of the rotating shaft passing through the proximal bearing; The driving unit further comprises a control member electrically connected to the coil winding, the control member is mounted in the housing, a second mounting hole is provided on the control member, and the rotating shaft passes through the second mounting hole.

12. The blood pump according to claim 1, characterized in that The axial spacing between the magnet and the column of the stator is 0.1mm to 0.5mm; and / or, the blood pump also includes a sleeve, which is provided with a blood flow inlet and a blood flow outlet, and the proximal end of the sleeve is connected to the housing of the drive unit; the impeller is arranged in the sleeve.

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