Drive unit and blood pump

Abstract

This invention relates to the field of medical device technology, providing a driving device and a blood pump. The driving device includes a housing, a rotating shaft, a first rotor, a first bushing, a second bushing, and a limiting component. The first rotor is fixed to one end of the rotating shaft and has a ball head that protrudes along the axis of the rotating shaft. The first bushing has a groove with an inwardly concave spherical groove wall, and the ball head is movably disposed within the groove and can abut against the spherical groove wall. The rotating shaft rotatably passes through the second bushing. The limiting component is fixed to the rotating shaft and located between the second bushing and the first rotor, and can abut against the second bushing. The above-described driving device and blood pump are relatively easy to assemble.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a drive device and a blood pump. Background Technology

[0002] The 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 inserted into the patient's heart to function as a left ventricular assist device or a right ventricular assist device.

[0003] Blood pumps typically consist of a drive unit and an impeller. The impeller is connected to the drive shaft of the drive unit. In order to achieve stable rotation of the drive shaft, it is usually necessary to add a component to limit the drive shaft, which makes the structure of the drive unit complex and increases the assembly difficulty of the drive unit. Summary of the Invention

[0004] The purpose of this invention is to provide a drive device and a blood pump that are easier to assemble.

[0005] A driving device, comprising:

[0006] case;

[0007] A rotating shaft for connection with the impeller, the rotating shaft being rotatably mounted on the housing;

[0008] A first rotor is fixed to one end of the rotating shaft. The first rotor has a ball head that protrudes along the axis of the rotating shaft.

[0009] A first bushing is installed on the housing. The first bushing has a groove with a concave spherical groove wall. The ball head is movably disposed in the groove and can abut against the spherical groove wall.

[0010] The second bushing is mounted on the housing, wherein the rotating shaft is rotatably passed through the second bushing, and the first rotor is located between the first bushing and the second bushing;

[0011] A limiting component is fixed to the rotating shaft and located between the second bushing and the first rotor. The limiting component can abut against the second bushing.

[0012] In one embodiment, the first rotor includes a first flywheel and a first magnet, the first flywheel being fixed to the shaft and the first magnet being fixed to the first flywheel, and the ball head being disposed on the first flywheel; the driving device further includes a stator, the stator being located between the first rotor and the limiting component, and the stator being capable of generating a rotating magnetic field that drives the first magnet to rotate.

[0013] In one embodiment, the first flywheel includes a first disc-shaped portion, a first inner tube, and a first outer tube. One end of both the first inner tube and the first outer tube is fixedly connected to the first disc-shaped portion. The first inner tube and the first outer tube are located on the same side of the first disc-shaped portion and are coaxially arranged. The inner diameter of the first outer tube is larger than the outer diameter of the first inner tube. The first inner tube is at least partially housed within the first outer tube. A first annular cavity for accommodating the first magnet is formed between the first outer tube and the first inner tube. The rotating shaft has a connecting end for connecting the impeller. The end of the rotating shaft away from the connecting end is fixedly housed in the first inner tube. The ball head is located on the side of the first disc-shaped portion opposite to the first inner tube.

[0014] In one embodiment, the first bushing is further provided with a liquid passage hole, which communicates with the groove. The driving device also includes a fixed seat, which is fixedly connected to the housing. The fixed seat is provided with an installation cavity and a liquid inlet hole communicating with the installation cavity. The first bushing is installed in the installation cavity, and the liquid passage hole is in fluid communication with the liquid inlet hole.

[0015] In one embodiment, the mounting cavity has a cavity bottom, one opening of the liquid inlet is located at the cavity bottom, and a support step is provided inside the mounting cavity. The support step abuts against the first bushing so that the first bushing is spaced apart from the cavity bottom by a certain distance.

[0016] And / or, the mounting base is further provided with a flow channel, which communicates with the liquid inlet hole, so that the fluid entering the liquid inlet hole can also flow into the housing through the flow channel;

[0017] And / or, one opening of the liquid passage is located on the wall of the spherical groove, the opening is located at the center of the wall of the spherical groove, and the diameter of the opening is 1 / 9 to 1 / 3 of the diameter of the sphere where the spherical head is located.

[0018] In one embodiment, the first rotor further includes a rotor body and a connecting post portion fixed to one end of the rotor body. The rotor body is fixed to the rotating shaft. The ball head is formed at the end of the connecting post portion away from the rotor body. The length of the ball head in the axial direction of the rotating shaft is less than the depth of the groove. The connecting post portion is partially received in the groove.

[0019] In one embodiment, the limiting component includes a second rotor and a thrust ring, the second rotor being fixed to the shaft, and the thrust ring being fixed to at least one of the second rotor and the shaft, the thrust ring being capable of abutting against the second bushing.

[0020] In one embodiment, the second rotor includes a second flywheel and a second magnet, the second flywheel being fixed to the shaft and the second magnet being fixed to the second flywheel; the drive device further includes a stator located between the first rotor and the second rotor, the stator being capable of generating a rotating magnetic field that drives the second magnet to rotate, wherein the thrust ring is an annular protrusion formed on the side of the second flywheel opposite to the stator.

[0021] In one embodiment, the housing is provided with a partition ring that divides the inner cavity of the housing into a limiting cavity and a receiving cavity. The partition ring is located between the second bushing and the second rotor. The second bushing is received in the limiting cavity and abuts against the partition ring, and the second rotor is received in the receiving cavity.

[0022] When the thrust ring abuts against the second bushing, the thrust ring is at least partially located in the inner ring of the partition ring, there is a gap between the thrust ring and the inner ring wall of the partition ring for fluid flow, and the partition ring is spaced apart from the second rotor by a certain distance.

[0023] A blood pump includes an impeller and a drive device as described in any one of the above, wherein the rotating shaft is connected to the impeller and the rotating shaft is capable of driving the impeller to rotate.

[0024] In the aforementioned drive device and blood pump, the limiting component is fixed to the rotating shaft and abuts against the second bushing, thereby limiting the range of movement of the rotating shaft along the axial direction of the rotating shaft towards the second bushing. One end of the rotating shaft is fixed to the first rotor, and the ball head of the first rotor is movably disposed in the groove and abuts against the spherical groove wall of the groove, thereby limiting the range of movement of the rotating shaft along the axial direction of the rotating shaft towards the first bushing. At the same time, since the rotating shaft can rotatably pass through the second bushing, and the ball head of the first rotor fixed to the rotating shaft is disposed in the groove, the spherical groove wall of the groove can also limit the swing range of the first rotor and the rotating shaft in the radial direction of the rotating shaft, thereby achieving overall limitation of the radial swing range of the rotating shaft. Thus, both axial and radial limiting of the rotating shaft are achieved, thereby reducing the number of components used for limiting the rotating shaft and helping to reduce the assembly difficulty of the drive device and blood pump. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1This is a schematic diagram of the blood pump provided in an embodiment of the present invention;

[0027] Figure 2 for Figure 1 The blood pump shown omits the cross-sectional view of the cannula, impeller, and part of the catheter;

[0028] Figure 3 for Figure 1 A cross-sectional view of the blood pump assembly consisting of the shaft, thrust ring, first rotor, second rotor, first bushing, and second bushing.

[0029] Figure 4 for Figure 2 A magnified view of part I shown;

[0030] Figure 5 for Figure 2 The diagram shows the structure of the first flywheel of the first rotor.

[0031] Figure 6 for Figure 5 A cross-sectional view of the first flywheel;

[0032] Figure 7 for Figure 2 A schematic diagram of the structure of the first bushing in the middle;

[0033] Figure 8 for Figure 7 A sectional view of the first bushing in the middle;

[0034] Figure 9 for Figure 2 The diagram shows the structure of the blood pump mounting base;

[0035] Figure 10 for Figure 2 A magnified view of a portion of the blood pump shown;

[0036] Figure 11 for Figure 2 The diagram shows the structure of the second bushing of the blood pump.

[0037] Figure 12 for Figure 1 The diagram shows the assembly of the stator and magnetic conductor of the blood pump. Detailed Implementation

[0038] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0039] Throughout this specification, references to "an embodiment" or "an embodiment" mean that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of this application. Therefore, the phrases "in one embodiment" or "in some embodiments" appear in various places throughout the specification, and not all refer to the same embodiment. Furthermore, in one or more embodiments, particular features, structures, or characteristics may be combined in any suitable manner.

[0040] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0041] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0042] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0043] In the field of interventional medicine, the end of the device closer to the operator is usually defined as the proximal end, and the end farther from the operator is defined as the distal end.

[0044] The blood pump 1 and the drive device 10 in the embodiments of the present invention will now be described.

[0045] Please see Figure 1 The blood pump 1 includes a drive unit 10 and an impeller 20. The drive unit 10 is connected to the impeller 20 in a transmission manner, and the drive unit 10 can drive the impeller 20 to rotate.

[0046] Specifically, the blood pump 1 also includes a cannula 40 fixed to the distal end of the drive unit 10. An impeller 20 is rotatably housed within the cannula 40. The cannula 40 has a blood inlet 41 and a blood outlet 42. When the impeller 20 rotates, blood flows into the cannula 40 from the blood inlet 41 and out from the blood outlet 42. In one embodiment, the cannula 40 extends through a heart valve, such as an aortic valve, with the blood inlet 41 located inside the heart and the blood outlet 42 and drive unit 10 located outside the heart in a blood vessel such as the aorta.

[0047] Specifically, the blood pump 1 also includes a catheter 50, which is connected to the proximal end of the drive device 10. The catheter 50 is used to accommodate various supply lines. For example, the supply lines include wires for electrical connection to the drive device 10 and flushing lines for introducing flushing fluid into the blood pump 1. Optionally, the flushing fluid is physiological saline, heparinized saline, or glucose, etc.

[0048] Please see Figures 2 to 4 The drive device 10 includes a housing 100, a rotating shaft 200, a first rotor 300, a first bushing 400, a second bushing 500, and a limiting component 600.

[0049] The housing 100 is generally a cylindrical housing open at both ends. The distal end of the housing 100 is fixedly connected to the sleeve 40, and the proximal end is fixedly connected to the conduit 50. The housing 100 has an internal cavity. Specifically, a partition ring 110 is provided inside the housing 100, which divides the internal cavity of the housing 100 into a limiting cavity 102 and a receiving cavity 103. In the illustrated embodiment, the limiting cavity 102 and the receiving cavity 103 are arranged along the axial direction of the housing 100.

[0050] The rotating shaft 200 is elongated. The rotating shaft 200 is rotatably mounted on the housing 100 and is used to connect to the impeller 20. In the illustrated embodiment, the rotating shaft 200 extends substantially along the axial direction of the housing 100, or in other words, the direction of extension of the axis of the rotating shaft 200 is substantially consistent with the axial direction of the housing 100. Therefore, the limiting cavity 102 and the receiving cavity 103 are arranged substantially along the axis of the rotating shaft 200. The rotating shaft 200 passes through the limiting cavity 102, is partially received in the receiving cavity 103, and is partially located outside the housing 100 or extends partially into the sleeve 40. Specifically, the end of the rotating shaft 200 used to connect to the impeller 20 is the connecting end 210.

[0051] In some embodiments, the shaft 200 is made of ceramic material. Compared to metal materials, ceramics have higher processing precision, higher biocompatibility and mechanical strength, and better wear resistance and corrosion resistance.

[0052] The first rotor 300 is fixed to one end of the rotating shaft 200, specifically, the first rotor 300 is fixed to the end of the rotating shaft 200 away from the connecting end 210. The first rotor 300 has a ball head 310, which protrudes along the axis of the rotating shaft 200 in a direction away from the connecting end 210. In the illustrated embodiment, the first rotor 300 is located in the housing 100. The first rotor 300 is located within the receiving cavity 103. The first rotor 300 is rotatable relative to the housing 100 and can drive the rotating shaft 200 to rotate.

[0053] Specifically, the drive device 10 further includes a stator 700, which is capable of driving the first rotor 300 to rotate. In the illustrated embodiment, the stator 700 is fixedly mounted within the housing 100, specifically located in the accommodating cavity 103, and the rotating shaft 200 rotatably passes through the stator 700. In one embodiment, the first rotor 300 is magnetic, and the stator 700 is capable of generating a rotating magnetic field that drives the first rotor 300 to rotate.

[0054] Specifically, the first rotor 300 includes a first flywheel 320 and a first magnet 330. The first flywheel 320 is fixedly connected to the rotating shaft 200, and the first magnet 330 is fixedly connected to the first flywheel 320. The first magnet 330 and the first flywheel 320 together constitute the rotor body of the first rotor 300. The first magnet 330 is a ring-shaped Helbeck array magnet. Specifically, a spherical head 310 is disposed on the first flywheel 320. By providing the first flywheel 320, the connection strength between the first magnet 330 and the rotating shaft 200 can be enhanced, and the shaking of the rotating shaft 200 during rotation can be reduced, making the entire rotating shaft 200 more stable during rotation.

[0055] Specifically, please combine them together. Figure 5 The first flywheel 320 includes a first disc-shaped portion 321, a first internal tube 322, and a first external tube 323. Both the first internal tube 322 and the first external tube 323 are cylindrical structures, while the first disc-shaped portion 321 is an annular disc structure. One end of both the first internal tube 322 and the first external tube 323 is fixedly connected to the first disc-shaped portion 321. The first internal tube 322 and the first external tube 323 are located on the same side of the first disc-shaped portion 321 and are coaxially arranged. The inner diameter of the first external tube 323 is larger than the outer diameter of the first internal tube 322. The first internal tube 322 is at least partially housed within the first external tube 323. A first annular cavity 324 for accommodating the first magnet 330 is formed between the first external tube 323 and the first internal tube 322. The shape of the first annular cavity 324 is adapted to the shape of the first magnet 330 to facilitate the installation and positioning of the first magnet 330. This configuration allows the first flywheel 320 to limit the first magnet 330, which not only facilitates the installation of the first magnet 330, but also makes the connection between the first magnet 330 and the first flywheel 320 more stable.

[0056] Specifically, the end of the rotating shaft 200 furthest from the connecting end 210 is fixedly housed in the first internal tube 322, meaning the rotating shaft 200 does not pass through the first disc-shaped portion 321, thus allowing the drive device 10 to be designed to be shorter. The ball head 310 is located on the side of the first disc-shaped portion 321 opposite to the first internal tube 322, that is, the ball head 310 is located on the side of the first disc-shaped portion 321 opposite to the rotating shaft 200.

[0057] Please combine them together Figure 6 Specifically, the first rotor 300 further includes a connecting post 340 with one end fixed to the rotor body, and a ball head 310 formed at the end of the connecting post 340 away from the rotor body. In other words, the end of the connecting post 340 away from the ball head 310 is fixed to the first flywheel 320 (specifically, the first disc-shaped portion 321). The axis of the connecting post 340 coincides with the axis of the rotating shaft 200. In the illustrated embodiment, the ball head 310 is generally hemispherical; the ball head 310 has a spherical crown surface and a circular bottom surface connected to the spherical crown surface, the circular bottom surface is connected to the end face of the connecting post 340, the connecting post 340 and the ball head 310 are coaxial, and the diameter of the end face of the connecting post 340 near the ball head 310 is equal to the diameter of the circular bottom surface.

[0058] It should be noted that the first flywheel 320 is not limited to the structure described above. In some embodiments, the first flywheel 320 does not have a first external tube 323; in some embodiments, the first flywheel 320 does not have a first external tube 323 and a first internal tube 322. In this case, the shaft 200 is fixedly inserted through the center of the first disc-shaped portion 321. Compared to a first flywheel 320 that only has a first disc-shaped portion 321, providing a first internal tube 322 allows for a more stable connection between the first flywheel 320 and the shaft 200.

[0059] Please refer to Figure 2 and Figure 3 The first bushing 400 and the second bushing 500 are both mounted on the housing 100. Specifically, the first bushing 400 is housed in the receiving cavity 103, and the second bushing 500 is housed in the limiting cavity 102. Both the first bushing 400 and the second bushing 500 are fixed to the housing 100. The first bushing 400 and the second bushing 500 are spaced apart along the axial direction of the housing 100. The rotating shaft 200 is rotatably inserted through the second bushing 500, and the second bushing 500 is closer to the connecting end 210 of the rotating shaft 200 than the first bushing 400. The first rotor 300 is located between the first bushing 400 and the second bushing 500; the stator 700 is also located between the first bushing 400 and the second bushing 500.

[0060] Specifically, the first bushing 400 has a groove 410 with a concave spherical groove wall 412. The spherical head 310 of the first rotor 300 is movably disposed within the groove 410 and can abut against the spherical groove wall 412. The groove 410 can support and limit the spherical head 310 of the first rotor 300, thereby limiting the range of movement of the first rotor 300 and the shaft 200 along the axis of the shaft 200 away from the impeller 20, and at the same time limiting the range of swing of the shaft 200 in the radial direction.

[0061] Please combine them together Figure 7 and Figure 8 Specifically, the connecting post 340 is partially received in the groove 410, which has an opening 413 through which the connecting post 340 passes. The length h of the spherical head 310 in the axial direction of the rotating shaft 200 is less than the depth s of the groove 410 (the depth s of the groove 410 is the maximum distance from the opening 413 of the groove 410 to the spherical groove wall 412), so as to better confine the spherical head 310 within the groove 410 and reduce the radial swing range of the first rotor 300 and the rotating shaft 200. In the illustrated embodiment, the radius of the spherical groove wall 412 is greater than the radius of the spherical head 310, that is, the radius of the sphere containing the spherical groove wall 412 is greater than the radius of the sphere containing the spherical head 310. The axial length L of the spherical groove wall 412 in the first bushing 400 is less than the depth s of the groove 410.

[0062] Specifically, the groove opening 413 of the groove 410 is rounded, that is, the groove wall at the groove opening 413 of the groove 410 is rounded to avoid the connecting column 340 being scratched and worn by the groove opening 413 of the groove 410 with sharp edges.

[0063] Specifically, the ball head 310 is provided with a diamond coating to make its surface smooth and improve its wear resistance.

[0064] Specifically, the first bushing 400 also has a fluid passage hole 420 communicating with the groove 410. The fluid passage hole 420 is in fluid communication with the cleaning line in the conduit 50, allowing the flushing fluid to enter the groove 410 through the fluid passage hole 420. The flushing fluid entering between the groove wall of the groove 410 and the ball head 310 provides lubrication, reducing friction between the ball head 310 and the groove wall of the groove 410, thereby reducing wear on the ball head 310 and the first bushing 400.

[0065] Specifically, one opening 421 of the fluid passage 420 is located at the center of the spherical groove wall 412, so that the flushing fluid entering the groove 410 from the fluid passage 420 provides an axial force to the spherical head 310 as much as possible. More specifically, the central axis of the fluid passage 420 coincides with the central axis of the cavity enclosed by the spherical groove wall 412, so that the fluid passage 420 is a straight hole to reduce the energy consumption of the flushing fluid in the fluid passage 420.

[0066] Specifically, the diameter of the opening 421 of the liquid passage 420 located on the spherical groove wall 412 is 1 / 9 to 1 / 3 of the diameter of the sphere where the spherical head 310 is located. In the illustrated embodiment, since the diameter of the liquid passage 420 is constant, that is, the diameter of the liquid passage 420 is 1 / 9 to 1 / 3 of the diameter of the sphere where the spherical head 310 is located. If the diameter of the opening 421 of the fluid passage 420 on the spherical groove wall 412 is too large, it will reduce the contact area between the ball head 310 and the spherical groove wall 412 (resulting in greater pressure per unit area), which will increase the wear of the ball head 310 by the spherical groove wall 412. If the diameter of the opening 421 is too small, it will affect the amount of flushing fluid entering the groove 410 from the fluid passage 420. The flushing fluid entering the groove 410 needs to provide a force to the ball head 310 and also enters the space between the ball head 310 and the spherical groove wall 412 to provide lubrication and reduce the coefficient of friction between the ball head 310 and the spherical groove wall 412. Therefore, the amount of flushing fluid entering the groove 410 should not be too small.

[0067] Please combine them together Figure 2 , Figure 4 and Figure 9 Specifically, the drive device 10 also includes a fixing seat 810, which is fixedly connected to the housing 100. The fixing seat 810 has a mounting cavity 811 and a liquid inlet hole 812 communicating with the mounting cavity 811. The first bushing 400 is installed in the mounting cavity 811. The liquid passage hole 420 communicates with the liquid inlet hole 812. The end of the liquid inlet hole 812 away from the mounting cavity 811 is used to communicate with the cleaning pipeline of the conduit 50, so that the flushing fluid can flow through the liquid inlet hole 812 and the liquid passage hole 420 into the groove wall of the groove 410 and the ball head 310, and then into the inner cavity of the housing 100.

[0068] Specifically, the mounting cavity 811 has a cavity bottom 8111 and an opening 8121 of the liquid inlet hole 812 (see...). Figure 4 The bottom of the mounting cavity 8111 is located in the mounting cavity 811. A support step 8112 is provided within the mounting cavity 811. The support step 8112 abuts against the first bushing 400, thus creating a distance between the first bushing 400 and the bottom of the cavity 8111 to better ensure the smooth flow of the flushing fluid. Specifically, the support step 8112 abuts against the side of the first bushing 400 that faces away from the second bushing 500.

[0069] Specifically, the mounting base 810 also has a diversion channel 813, which is in fluid communication with the inlet hole 812, so that the fluid (e.g., flushing fluid) flowing through the inlet hole 812 can also flow into the housing 100 through the diversion channel 813. Specifically, one end of the diversion channel 813 is connected to the gap between the first bushing 400 and the bottom 8111 of the mounting cavity 811, and the other end is connected to the receiving cavity 103. In the illustrated embodiment, the diversion channel 813 is formed by a partial recess in the cavity wall of the mounting cavity 811. In other words, under normal conditions, after the flushing fluid enters the mounting cavity 811 from the inlet hole 812, it is divided into two streams: one stream flows into the groove 410 of the first bushing 400 through the liquid passage hole 420, and the other stream flows out through the diversion channel 813. The diversion channel 813 ensures the flow of flushing fluid even when the ball head 310 blocks the liquid passage hole 420.

[0070] In the illustrated embodiment, there are two flow channels 813, which are arranged opposite to each other. It is understood that the number of flow channels 813 can be adjusted according to design requirements; for example, in some embodiments, the number of flow channels 813 may be one or more than two.

[0071] Please combine Figure 2 and Figure 10 The second bushing 500 abuts against the partition ring 110. In the illustrated embodiment, the second bushing 500 is housed within the limiting cavity 102, and the partition ring 110 facilitates positioning of the second bushing 500, enabling convenient assembly. The second bushing 500 has a shaft hole 510 through which the rotating shaft 200 rotatably passes. In the illustrated embodiment, the central axis of the shaft hole 510 coincides with the central axis of the fluid passage hole 420 of the first bushing 400. A gap for fluid flow exists between the wall of the shaft hole 510 of the second bushing 500 and the rotating shaft 200. The flushing fluid entering the accommodating cavity 103 can flow through the gap between the rotating shaft 200 and the wall of the shaft hole 510 and exit the housing 100.

[0072] A limiting member 600 is fixed to the rotating shaft 200 and is located between the second bushing 500 and the first rotor 300. The limiting member 600 can abut against the second bushing 500, thereby limiting the range of movement of the rotating shaft 200 along its axis toward the second bushing 500. In the illustrated embodiment, the stator 700 is located between the first rotor 300 and the limiting member 600.

[0073] Please refer to Figure 2 , Figure 3 and Figure 10The limiting component 600 includes a thrust ring 610 and a second rotor 620. The second rotor 620 is fixed to the rotating shaft 200, and the thrust ring 610 is fixed to at least one of the second rotor 620 and the rotating shaft 200. In other words, the thrust ring 610 can be directly fixed to only the second rotor 620, only the rotating shaft 200, or both. Since the second rotor 620 is fixed to the rotating shaft 200, and the thrust ring 610 is fixed to at least one of the second rotor 620 and the rotating shaft 200, the thrust ring 610, the rotating shaft 200, and the second rotor 620 rotate and move synchronously. The thrust ring 610 is located between the second rotor 620 and the second shaft sleeve 500, and the thrust ring 610 can abut against the second shaft sleeve 500 to limit the range of movement of the rotating shaft 200 along its axial direction toward the impeller 20.

[0074] Furthermore, the first rotor 300 is fixed to one end of the rotating shaft 200. The spherical head 310 of the first rotor 300 is disposed in the groove 410 of the first bushing 400 and can abut against the spherical groove wall 412 of the groove 410 to limit the range of movement of the rotating shaft 200 along the axis of the rotating shaft 200 away from the impeller 20, thereby achieving the limitation of the rotating shaft 200 on the axis of the rotating shaft 200. At the same time, since the rotating shaft 200 passes through the second bushing 500, and since the spherical head 310 is disposed in the groove 410 of the first bushing 400, the groove wall of the groove 410 of the first bushing 400 can also limit the range of swing of the spherical head 310 in the radial direction of the rotating shaft 200, thereby achieving the overall limitation of the radial swing range of the rotating shaft 200. In other words, the above design not only achieves the axial limitation of the rotating shaft 200, but also the radial limitation of the rotating shaft 200.

[0075] The second rotor 620 is housed in the receiving cavity 103, and the partition ring 110 is located between the second rotor 620 and the second bushing 500. Specifically, the second rotor 620 includes a second flywheel 621 and a second magnet 622. The second flywheel 621 is fixed to the rotating shaft 200, and the second magnet 622 is fixed to the second flywheel 621. By providing the second flywheel 621, the connection strength between the second magnet 622 and the rotating shaft 200 can be enhanced; in addition, the shaking of the rotating shaft 200 during rotation can be reduced, making the entire rotating shaft 200 more stable during rotation.

[0076] Optionally, the second magnet 622 is a ring-shaped Heilbeck array magnet.

[0077] Specifically, the second flywheel 621 includes a second disc-shaped portion 6211, a second inner tube 6212, and a second outer tube 6213. Both the second inner tube 6212 and the second outer tube 6213 are cylindrical structures, while the second disc-shaped portion 6211 is an annular disc structure. The second inner tube 6212 and the second outer tube 6213 are both fixedly connected to the second disc-shaped portion 6211. The second outer tube 6213 surrounds the second disc-shaped portion 6211. The second inner tube 6212 and the second outer tube 6213 are coaxially arranged. A rotating shaft 200 passes through the second inner tube 6212 and is fixedly connected to it. A second annular cavity is formed between the second inner tube 6212 and the second outer tube 6213. A second magnet 622 is housed in the second annular cavity. The shape of the second annular cavity is adapted to the second magnet 622 to facilitate its installation and positioning. This configuration allows the second flywheel 621 to limit the second magnet 622, which not only facilitates the installation of the second magnet 622, but also makes the connection between the second magnet 622 and the second flywheel 621 more stable.

[0078] It should be noted that the second flywheel 621 is not limited to the structure described above. In some embodiments, the second flywheel 621 does not have a second external tube 6213; in some embodiments, the second flywheel 621 does not have a second internal tube 6212 and a second external tube 6213. In this case, the shaft 200 is fixedly inserted through the center of the second disc-shaped portion 6211. Compared to a second flywheel 621 that only has a second disc-shaped portion 6211, providing a second internal tube 6212 allows for a more stable connection between the second flywheel 621 and the shaft 200.

[0079] In the illustrated embodiment, the thrust ring 610 is an annular protrusion formed on the side of the second flywheel 621 opposite to the stator 700. More specifically, the thrust ring 610 is disposed on the side of the second disc-shaped portion 6211 opposite to the second internal tube 6212. That is, the thrust ring 610 and the second flywheel 621 are integrally formed into a single structure. Since the overall volume of the blood pump 1 is small, the thrust ring 610 is even smaller, difficult to manufacture with high precision, and difficult to assemble. Integrating the thrust ring 610 and the second flywheel 621 into a single structure facilitates installation and eliminates the need for adhesive bonding.

[0080] It is understood that in other embodiments, the thrust ring 610 and the second rotor 620 may also be separate structures before assembly. In this case, the thrust ring 610 may be fixed together with at least one of the second rotor 620 and the shaft 200 by means of bonding or welding.

[0081] Specifically, when the thrust ring 610 abuts against the second bushing 500, the thrust ring 610 is at least partially located within the inner ring of the partition ring 110. A gap for fluid flow exists between the thrust ring 610 and the inner ring wall of the partition ring 110, and the partition ring 110 is spaced apart from the second rotor 620. By creating a gap for fluid flow between the thrust ring 610 and the inner ring wall of the partition ring 110, flushing fluid can flow into the shaft hole 510 of the second bushing 500 through the gap, thus achieving fluid communication between the shaft hole 510 of the second bushing 500 and the accommodating cavity 103. When the thrust ring 610 abuts against the second bushing 500, the partition ring 110 is spaced apart from the second rotor 620 to prevent friction and wear caused by contact between the second rotor 620 and the partition ring 110 when the thrust ring 610 abuts against the second bushing 500.

[0082] Specifically, the thrust ring 610 is generally annular, and its central axis coincides with the axis of the rotating shaft 200. The outer diameter of the thrust ring 610 is smaller than the inner diameter of the partition ring 110, thereby creating a gap between the thrust ring 610 and the inner ring wall of the partition ring 110 for fluid flow. In other embodiments, the thrust ring 610 may also be composed of a plurality of fan-shaped rings arranged at uniform intervals around the rotating shaft 200, or, as can be understood, composed of a plurality of fan-shaped rings arranged discretely in a circumferential direction.

[0083] Specifically, the thickness of the thrust ring 610 along the axis of the rotating shaft 200 is greater than the thickness of the partition ring 110 along the axis of the rotating shaft 200, so that when the thrust ring 610 abuts against the second bushing 500, the partition ring 110 is spaced apart from the rotor by a certain distance. It can be understood that in some embodiments, the thickness of the thrust ring 610 along the axis of the rotating shaft 200 can be less than or equal to the thickness of the partition ring 110 along the axis of the rotating shaft 200. In this case, the second rotor 620 and the thrust ring 610 can be spaced apart by a certain distance along the axis of the rotating shaft 200, a distance sufficient to ensure that when the thrust ring 610 abuts against the second bushing 500, the partition ring 110 is spaced apart from the second rotor 620 by a certain distance.

[0084] Specifically, please combine them together. Figure 11A partial recess on the side of the second bushing 500 facing the thrust ring 610 forms a flow guide groove 530, which communicates with the shaft hole 510 of the second bushing 500. When the thrust ring 610 abuts against the second bushing 500, part of the flow guide groove 530 is not covered by the thrust ring 610. Therefore, although the thrust ring 610 blocks the gap between the shaft hole 510 of the second bushing 500 and the rotating shaft 200 when the thrust ring 610 abuts against the second bushing 500, the flow guide groove 530 not covered by the thrust ring 610 can still flow when the thrust ring 610 abuts against the second bushing 500. The body is connected to ensure the smooth flow of flushing fluid. In addition, a guide groove 530 is formed by a partial recess on the side of the second bushing 500 facing the thrust ring 610, so that the flushing fluid can flow better into the space between the thrust ring 610 and the second bushing 500. This lubricates the contact surfaces of the thrust ring 610 and the second bushing 500, reduces friction between the thrust ring 610 and the second bushing 500, reduces wear caused by friction between the thrust ring 610 and the second bushing 500, and also dissipates heat from the thrust ring 610 and the second bushing 500.

[0085] Specifically, the thrust ring 610 has a stop surface 611, which is perpendicular to the axis of the rotating shaft 200. The second bushing 500 has a stop surface 520, which is perpendicular to the central axis of the shaft hole 510 of the second bushing 500. The stop surface 520 is opposite to the stop surface 611 and can abut against the stop surface 611 to restrict the movement of the rotating shaft 200 along the axis of the rotating shaft 200 toward the impeller 20. Because the stop surface 611 is perpendicular to the axis of the rotating shaft 200, and the stop surface 520 is perpendicular to the central axis of the shaft hole 510 of the second bushing 500, the rotating shaft 200 can rotatably pass through the shaft hole 510 of the second bushing 500. Therefore, when the rotating shaft 200 is operating normally and the thrust ring 610 abuts against the second bushing 500, the stop surface 611 and the stop surface 520 can make surface-to-surface contact, reducing wear caused by friction between the thrust ring 610 and the second bushing 500. Specifically, the stop surface 520 abuts against the partition ring 110. The guide groove 530 is formed by a partial recess in the stop surface 520.

[0086] Specifically, the roughness of at least one of the stop surface 611 and the stop surface 520 is less than or equal to 0.1 micrometers. In some embodiments, the roughness of both the stop surface 611 and the stop surface 520 is less than or equal to 0.1 micrometers. In some embodiments, the roughness of one of the stop surface 611 and the stop surface 520 is less than or equal to 0.1 micrometers. By reducing the roughness of at least one of the stop surface 611 and the stop surface 520, the frictional force between the stop surface 611 and the stop surface 520 can be effectively reduced, thereby reducing wear problems caused by friction between the second bushing 500 and the thrust ring 610.

[0087] In some embodiments, at least one of the stop surface 611 and the stop surface 520 is a ceramic surface. Ceramic has high processing precision, high biocompatibility, high mechanical strength, and good wear resistance and corrosion resistance. In this case, the thrust ring 610 and the second bushing 500 can be made of ceramic, or at least one of the stop surface 611 and the stop surface 520 can be made of ceramic by applying a ceramic coating. In some embodiments, the stop surface 611 is made of diamond to give it high hardness, a smooth surface, and wear resistance. In this case, the stop surface 611 is made of ceramic by applying a diamond coating.

[0088] For details, please refer to Figure 2 and Figure 12 The stator 700 includes a first stator unit 710 and a second stator unit 720 disposed along the axis of the rotating shaft 200. The first stator unit 710 is capable of driving the first rotor 300 to rotate, and the second stator unit 720 is capable of driving the second rotor 620 to rotate. Specifically, the first stator unit 710 is capable of generating a rotating magnetic field that drives the first rotor 300 to rotate, and the second stator unit 720 is capable of generating a rotating magnetic field that drives the second rotor 620 to rotate. Both the first stator unit 710 and the second stator unit 720 are fixedly housed within the receiving cavity 103 of the housing 100. The rotating shaft 200 is rotatably disposed through the first stator unit 710 and the second stator unit 720. The first stator unit 710 and the second stator unit 720 are both located between the first rotor 300 and the second rotor 620. Specifically, the first rotor 300, the second rotor 620, the first stator unit 710, and the second stator unit 720 are all located between the first bushing 400 and the second bushing 500; the first rotor 300 is positioned closer to the first bushing 400, and the second rotor 620 is positioned closer to the second bushing 500. In other words, the first bushing 400, the first rotor 300, the first stator unit 710, the second stator unit 720, the second rotor 620, and the second bushing 500 are arranged sequentially along the axis of the rotating shaft 200, wherein the second bushing 500 is closest to the connecting end 210 of the rotating shaft 200.

[0089] Both the first stator unit 710 and the second stator unit 720 include a magnetic core and a coil, with the coil wound around the magnetic core. Specifically, the first stator unit 710 includes a first magnetic core 711 and a first coil 712, with the first coil 712 wound around the first magnetic core 711. There are multiple first magnetic cores 711, arranged around the axis of the rotating shaft 200. Each first magnetic core 711 has a first coil 712.

[0090] The structure of the second stator unit 720 is similar to that of the first stator unit 710. The second stator unit 720 includes a second magnetic core 721 and a second coil 722, with the second coil 722 wound around the second magnetic core 721. There are multiple second magnetic cores 721, arranged around the axis of the rotating shaft 200. Each second magnetic core 721 has one second coil 722.

[0091] Specifically, the drive device 10 further includes a magnetic conductor 820 fixedly connected to the housing 100. The first magnetic core 711 of the first stator unit 710 and the second magnetic core 721 of the second stator unit 720 are both fixedly connected to the magnetic conductor 820. Specifically, the magnetic conductor 820 is fixedly housed within the housing 100, for example, snapped into the inner sidewall of the housing 100. The rotating shaft 200 is rotatably disposed through the magnetic conductor 820. One end of the first magnetic core 711 is fixedly connected to the magnetic conductor 820, and the first rotor 620 is disposed near the other end of the first magnetic core 711; one end of the second magnetic core 721 is fixedly connected to the magnetic conductor 820, and the second rotor 620 is disposed near the other end of the second magnetic core 721.

[0092] The magnetic guide element 820 serves to close the magnetic circuit, promoting and increasing the generation of magnetic flux and improving coupling capability. Therefore, the magnetic guide element 820 closes the magnetic circuit between the first stator unit 710 and the first rotor 300, and between the second stator unit 720 and the second rotor 620, increasing magnetic flux. This, in turn, helps reduce the overall diameter of the drive device 10. Furthermore, by fixing the first magnetic core 711 of the first stator unit 710 and the second magnetic core 721 of the second stator unit 720 to the magnetic guide element 820, the positioning and installation of the first stator unit 710 and the second stator unit 720 can be achieved, reducing the assembly difficulty of the first stator unit 710 and the second stator unit 720. Simultaneously, the magnetic guide element 820, configured in the above manner, also reduces the need for positioning structures within the housing 100, thereby simplifying the structure of the housing 100 and the assembly process of the entire drive device 10.

[0093] Specifically, the magnetic conductive component 820 includes two magnetic conductive plates 821, which are stacked. One magnetic conductive plate 821 is fixedly connected to the first magnetic core 711 of the first stator unit 710, and the other magnetic conductive plate 821 is fixedly connected to the second magnetic core 721 of the second stator unit 720. The rotating shaft 200 is rotatably inserted through the two magnetic conductive plates 821. Specifically, the two magnetic conductive plates 821 are separate before assembly. By setting the magnetic conductive component 820 to be two separate magnetic conductive plates 821 before assembly, when assembling the drive device 10, the first magnetic core 711 can be fixedly connected to the magnetic conductive plate 821 first, and the second magnetic core 721 can be fixedly connected to the other magnetic conductive plate 821. Then, the two magnetic conductive plates 821 are stacked. In this way, the first magnetic core 711 and the second magnetic core 721 can be conveniently assembled to the two magnetic conductive plates 821 respectively, making the assembly of the first magnetic core 711 and the second magnetic core 721 more convenient.

[0094] Specifically, the two magnetic plates 821 are fixedly connected, thereby enabling the first stator unit 710, the second stator unit 720, and the magnetic conductor 820 to form a single unit and be assembled into the housing 100, making the assembly of the stator 700 easier. For example, the two magnetic plates 821 can be connected together by adhesive or welding. It is understood that in other embodiments, the two magnetic plates 821 are not fixedly connected, but are in contact with each other.

[0095] It should be noted that the magnetic conductor 820 is not limited to the above-mentioned combination of two separate magnetic conductor plates 821. The magnetic conductor 820 can also be a plate-shaped structure, with the first magnetic core 711 and the second magnetic core 721 both connected to the magnetic conductor 820, that is, the first stator unit 710 and the second stator unit 720 share a magnetic conductor 820.

[0096] Specifically, the magnetic plate 821 is made of silicon steel, and the first magnetic core 711 and the second magnetic core 721 are also made of silicon steel.

[0097] Both the first magnetic core 711 and the second magnetic core 721 are cylindrical structures without a wide head (i.e., pole shoe). Compared to magnetic cores with pole shoes, the cylindrical structure reduces magnetic losses and increases the magnetic coupling density between the core and the magnet, thereby increasing the torque of the stator 700 on the magnet (under equal current conditions). In addition, the headless core can greatly reduce the problem of local magnetic short circuits and reduced motor power caused by contact between adjacent magnetic cores.

[0098] It is understood that the structure of the drive device 10 is not limited to the structure described above. In some embodiments, the drive device 10 includes a first rotor 300, a second rotor 620, and a stator 700, but the stator 700 has only one stator unit, that is, only a first stator unit 710 and no second stator unit 720. In this case, the first stator unit 710 is located between the first rotor 300 and the second rotor 620, and the first stator unit 710 can drive the first rotor 300 and the second rotor 620 to rotate simultaneously.

[0099] It is understood that the limiting component 600 is not limited to the structure described above. In some embodiments, the limiting component 600 is only a thrust ring 610 and does not have a second rotor 620. In this case, the stator 700 has only one stator unit. The thrust ring 610 is fixed to the rotating shaft 200 and abuts against the second bushing 500 to limit the range of movement of the rotating shaft 200 along its axis toward the second bushing 500. In some embodiments, the limiting component 600 is only a second rotor 620 and does not have a thrust ring 610. In this case, the second rotor 620 is fixed to the rotating shaft 200, and the stator 700 is located between the first rotor 300 and the second rotor 620. The side of the second rotor 620 away from the stator 700 abuts against the second bushing 500 or the partition ring 110 to limit the range of movement of the rotating shaft 200 along its axis toward the impeller 20.

[0100] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A driving device, characterized in that, include: case; A rotating shaft for connection with an impeller, the rotating shaft being rotatably mounted on the housing, the rotating shaft having a connecting end for connection with the impeller, the connecting end being located outside the housing; A first rotor is fixed to one end of the shaft. The first rotor is magnetic and can be driven to rotate by the stator. The end of the shaft away from the connection end is fixedly housed in the first rotor, such that the shaft does not pass through the first rotor. The first rotor has a ball head located on the side of the first rotor opposite to the shaft, and the ball head protrudes along the axis of the shaft in a direction away from the shaft. A first bushing is installed on the housing. The first bushing has a groove, wherein the ball head is movably disposed in the groove, and the groove can support and limit the ball head. The second bushing is mounted on the housing, wherein the rotating shaft is rotatably passed through the second bushing, and the first rotor is located between the first bushing and the second bushing; A limiting component is fixed to the rotating shaft, the limiting component is located between the second bushing and the first rotor, and the limiting component can abut against the second bushing; The groove has a concave spherical groove wall that can abut against the ball head. The length of the spherical groove wall in the axial direction of the first bushing is less than the depth of the groove. The groove has an opening that is rounded. The driving device further includes a fixed base, which is fixedly connected to the housing. The fixed base has an installation cavity, a liquid inlet hole communicating with the installation cavity, and a diversion channel. The first bushing is installed in the installation cavity. The first bushing also has a liquid passage hole communicating with the groove. The liquid passage hole is in fluid communication with the liquid inlet hole. The liquid passage hole has an opening located at the center of the spherical groove wall, and the diameter of the opening of the liquid passage hole located at the center of the spherical groove wall is 1 / 9 to 1 / 3 of the diameter of the sphere where the spherical head is located. The diversion channel is in communication with the liquid inlet hole, and the liquid inlet hole is in communication with the cleaning pipeline. Fluid entering the liquid inlet hole can also flow into the housing through the diversion channel.

2. The driving device according to claim 1, characterized in that: The first rotor includes a first flywheel and a first magnet. The first flywheel is fixed to the rotating shaft, and the first magnet is fixed to the first flywheel. The ball head is disposed on the first flywheel. The driving device also includes a stator, which is located between the first rotor and the limiting component. The stator is capable of generating a rotating magnetic field that drives the first magnet to rotate.

3. The driving device according to claim 2, characterized in that: The first flywheel includes a first disc-shaped portion, a first inner tube, and a first outer tube. One end of the first inner tube and the first outer tube are both fixedly connected to the first disc-shaped portion. The first inner tube and the first outer tube are located on the same side of the first disc-shaped portion and are coaxially arranged. The inner diameter of the first outer tube is larger than the outer diameter of the first inner tube. The first inner tube is at least partially housed within the first outer tube. A first annular cavity for accommodating the first magnet is formed between the first outer tube and the first inner tube. The end of the rotating shaft away from the connecting end is fixedly housed in the first inner tube, so that the rotating shaft does not pass through the first disc-shaped portion. The ball head is located on the side of the first disc-shaped portion opposite to the first inner tube.

4. The driving device according to claim 1, characterized in that: The first rotor includes a first flywheel and a first magnet. The first flywheel is fixedly connected to the rotating shaft, and the first magnet is fixedly connected to the first flywheel. The first rotor also includes a connecting column. One end of the connecting column is fixedly connected to the first flywheel, and the end of the connecting column away from the first flywheel forms the ball head. The axis of the connecting column coincides with the axis of the rotating shaft.

5. The driving device according to claim 2, characterized in that: The first flywheel includes a first disc-shaped portion connected to the rotating shaft, a first magnet mounted on the first disc-shaped portion, and a ball head disposed on the first disc-shaped portion, with the ball head located on the side of the first disc-shaped portion opposite to the rotating shaft.

6. The driving device according to any one of claims 1 to 5, characterized in that: The radius of the spherical groove wall is larger than the radius of the spherical head.

7. The driving device according to claim 1, characterized in that: The head of the ball is coated with a diamond.

8. The driving device according to claim 7, characterized in that: The liquid passage is a straight hole, and the central axis of the liquid passage coincides with the central axis of the spherical groove wall.

9. The driving device according to claim 1, characterized in that: The first rotor further includes a rotor body and a connecting column fixed to the rotor body at one end. The rotor body is fixed to the rotating shaft. The spherical head is formed at the end of the connecting column away from the rotor body. The spherical head is hemispherical. The spherical head has a spherical crown surface and a circular bottom surface connected to the spherical crown surface. The circular bottom surface is connected to the end face of the connecting column. The connecting column is coaxial with the spherical head, and the diameter of the end face of the connecting column near the spherical head is equal to the diameter of the circular bottom surface.

10. The driving device according to claim 1, characterized in that: The housing has an inner cavity, which is divided into a limiting cavity and a receiving cavity; one end of the flow channel is connected to the gap between the first bushing and the bottom of the mounting cavity, and the other end is connected to the receiving cavity.

11. The driving device according to claim 10, characterized in that: The mounting cavity has a bottom, one opening of the liquid inlet is located at the bottom of the cavity, and a support step is provided inside the mounting cavity. The support step abuts against the first bushing so that the first bushing is spaced a distance from the bottom of the cavity.

12. The driving device according to any one of claims 1 to 3 and 5, characterized in that: The first rotor further includes a rotor body and a connecting post portion fixed to the rotor body at one end. The rotor body is fixed to the rotating shaft. The ball head is formed at the end of the connecting post portion away from the rotor body. The length of the ball head in the axial direction of the rotating shaft is less than the depth of the groove. The connecting post portion is partially received in the groove.

13. The driving device according to any one of claims 1 to 5, characterized in that: The limiting component includes a second rotor and a thrust ring. The second rotor is fixed to the rotating shaft, and the thrust ring is fixed to at least one of the second rotor and the rotating shaft. The thrust ring is capable of abutting against the second bushing.

14. The driving device according to claim 13, characterized in that: The second rotor includes a second flywheel and a second magnet. The second flywheel is fixed to the shaft, and the second magnet is fixed to the second flywheel. The drive device also includes a stator located between the first rotor and the second rotor. The stator is capable of generating a rotating magnetic field that drives the second magnet to rotate. The thrust ring is an annular protrusion formed on the side of the second flywheel opposite to the stator.

15. The driving device according to claim 13, characterized in that: The housing is provided with a partition ring, which divides the inner cavity of the housing into a limiting cavity and a receiving cavity. The partition ring is located between the second bushing and the second rotor. The second bushing is received in the limiting cavity and abuts against the partition ring. The second rotor is received in the receiving cavity. When the thrust ring abuts against the second bushing, the thrust ring is at least partially located in the inner ring of the partition ring, there is a gap between the thrust ring and the inner ring wall of the partition ring for fluid flow, and the partition ring is spaced apart from the second rotor by a certain distance.

16. A blood pump, characterized in that: It includes an impeller and a drive device as described in any one of claims 1 to 15, wherein the rotating shaft is connected to the impeller and the rotating shaft is capable of driving the impeller to rotate.

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