Drive unit and blood pump

Abstract

A drive device (10) and a blood pump (1) are disclosed. The drive device (10) includes a housing (100), a rotating shaft (200), a first rotor (300), a first shaft sleeve (400), a second shaft sleeve (500), and a position limiting member (600). The first rotor (300) is fixedly connected to one end of the rotating shaft (200). The first rotor (300) has a ball head portion (310). The first shaft sleeve (400) has a recessed groove (410) having a recessed spherical groove wall (412). ) is formed, the ball head portion (310) is movably disposed within the groove (410), the rotating shaft (200) is rotatably disposed through the second shaft sleeve (500), the position limiting member (600) is fixedly connected to the rotating shaft (200), and the position limiting member (600) is located between the second shaft sleeve (500) and the first rotor (300), and the position limiting member (600) can abut against the second shaft sleeve (500).

Description

Technical Field

[0001] (Cross - reference to Related Applications) This application claims the priority of the Chinese patent application with the application number CN202210801382.2, which was filed with the China National Intellectual Property Administration on July 8, 2022, and all of its contents are incorporated herein by reference.

[0002] (Technical Field) This application relates to the technical field of medical devices, particularly to drive devices and blood pumps.

Background Art

[0003] 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 axilla, and can be inserted into the patient's heart to function as a left ventricular assist device or a right ventricular assist device.

[0004] The blood pump usually includes a drive device and an impeller. The impeller is connected to the drive shaft of the drive device. In order to achieve stable rotation of the drive shaft, it is usually necessary to add a member for restricting the position of the drive shaft, which makes the structure of the drive device complex and the assembly of the drive device difficult.

Summary of the Invention

Problems to be Solved by the Invention

[0005] Based on this, this application provides a drive device and a blood pump that are easy to assemble.

Means for Solving the Problems

[0006] An embodiment of the first aspect of this application is a housing, a rotating shaft configured to be connected to an impeller and rotatably attached to the housing, a first rotor fixedly connected to one end of the rotating shaft and having a ball head portion protruding along the axis of the rotating shaft, A first shaft sleeve attached to the housing, wherein the first shaft sleeve has a recessed groove having a recessed spherical groove wall, and the ball head portion is movably provided within the recessed groove and is capable of contacting the spherical groove wall of the first shaft sleeve, The second shaft sleeve is attached to the housing, the rotating shaft is provided rotatably through the second shaft sleeve, and the first rotor is located between the first shaft sleeve and the second shaft sleeve, The present invention provides a drive device including a position limiting member that is fixedly connected to the rotating shaft, positioned between the second shaft sleeve and the first rotor, and capable of contacting the second shaft sleeve.

[0007] An embodiment of a second aspect of the present application provides a blood pump comprising an impeller and a drive device described in the first aspect, wherein the rotating shaft is connected to the impeller and capable of driving the rotation of the impeller.

[0008] Details of one or more embodiments of the present invention are described in the following drawings and description. Other features, purposes and advantages of the present invention will become apparent from the specification, drawings and claims.

[0009] Below, in order to more clearly explain the technical concepts in the embodiments of this application, the drawings necessary for describing the embodiments or the prior art are briefly introduced. As is clear from the following description, the drawings are only a few embodiments of this application, and those skilled in the art can obtain other drawings based on these without expending any creative effort. [Brief explanation of the drawing]

[0010] [Figure 1] This is a schematic diagram of the structure of a blood pump according to an embodiment of the present invention. [Figure 2] Figure 1 is a cross-sectional view of the blood pump, with the cannula, impeller, and some catheter components omitted. [Figure 3]Figure 1 is a cross-sectional view of the blood pump, showing the assembled rotating shaft, thrust ring, first rotor, second rotor, first shaft sleeve, and second shaft sleeve. [Figure 4] This is a magnified view of part A shown in Figure 2. [Figure 5] Figure 2 is a schematic diagram of the structure of the first flywheel of the first rotor. [Figure 6] Figure 5 is a cross-sectional view of the first flywheel. [Figure 7] This is a magnified view of section B shown in Figure 6. [Figure 8] Figure 2 is a schematic diagram of the structure of the first axial sleeve. [Figure 9] Figure 8 is a cross-sectional view of the first axial sleeve. [Figure 10] Figure 2 is a schematic diagram of the structure of the mounting base for the blood pump. [Figure 11] Figure 2 is a magnified view of a portion of the blood pump shown. [Figure 12] Figure 2 is a schematic diagram of the structure of the second axis sleeve of the blood pump shown. [Figure 13] Figure 1 is a schematic diagram showing the assembled structure of the stator and permeable member of the blood pump. [Modes for carrying out the invention]

[0011] The present application will be described in more detail below with reference to the attached drawings and examples in order to provide a clearer understanding of its purpose, technical proposal and merits. It should be understood that the specific examples described herein are for interpretive purposes only and do not limit the present application.

[0012] When an element is described as being "fixed" or "attached" to another element, it may be directly or indirectly located on that other element. When an element is described as being "connected" to another element, it may be directly or indirectly connected to that other element.

[0013] Also, the terms "first" and "second" are for mere explanation purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features shown. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, "a plurality" means two or more unless otherwise specified.

[0014] Hereinafter, in order to explain the technical means of this application, it will be described while referring to specific drawings and examples.

[0015] In the field of interventional medicine, usually, one end close to the operator of the instrument is defined as the proximal end, and one end away from the operator is defined as the distal end.

[0016] The blood pump 1 and the drive device 10 in the embodiments of the present invention will be described.

[0017] Referring to FIG. 1, the blood pump 1 includes a drive device 10 and an impeller 20. The drive device 10 is transmission-connected to the impeller 20, and the drive device 10 can drive the impeller 20 to rotate.

[0018] Specifically, the blood pump 1 further includes a cannula 40 fixedly connected to the distal end of the drive device 10. The impeller 20 is rotatably accommodated in 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 then flows out from the blood outlet 42. In one embodiment, the cannula 40 extends and is inserted into a heart valve, for example, the aortic valve. The blood inlet 41 is located inside the heart, and the blood outlet 42 and the drive device 10 are located in a blood vessel such as the aorta outside the heart.

[0019] Specifically, the blood pump 1 further includes a catheter 50 connected to the near end of the drive unit 10. The catheter 50 is configured to accommodate various supply lines. For example, the supply lines include a conductor for electrical connection to the drive unit 10 and a wash line for passing a wash fluid through the blood pump 1. Preferably, the wash fluid is saline, heparin-containing saline, or glucose.

[0020] Referring to Figures 2 to 4, the drive unit 10 includes a housing 100, a rotating shaft 200, a first rotor 300, a first shaft sleeve 400, a second shaft sleeve 500, and a position limiting member 600.

[0021] The housing 100 is a cylindrical housing that is generally open at both ends. The distal end of the housing 100 is fixedly connected to the cannula 40, and the proximal end is fixedly connected to the catheter 50. The housing 100 has a chamber. Specifically, a partition ring 110 is provided inside the housing 100, and the partition ring 110 divides the chamber of the housing 100 into a position-restricting chamber 102 and a containment chamber 103. In the illustrated embodiment, the position-restricting chamber 102 and the containment chamber 103 are provided along the axial direction of the housing 100.

[0022] The rotating shaft 200 is elongated. The rotating shaft 200 is rotatably mounted in the housing 100 and is configured to be connected to the impeller 20. In the illustrated embodiment, the rotating shaft 200 extends generally along the axial direction of the housing 100, or the direction of extension of the axis of the rotating shaft 200 and the axial direction of the housing 100 generally coincide, so the position limiting chamber 102 and the housing chamber 103 are provided generally along the axis of the rotating shaft 200. The rotating shaft 200 is provided penetrating the position limiting chamber 102, with a portion housed in the housing chamber 103, a portion located outside the housing 100, or a portion extending into the cannula 40. Specifically, one end of the rotating shaft 200 configured to be connected to the impeller 20 is the connecting end 210.

[0023] In some embodiments, the rotating shaft 200 is made of ceramic material. Compared to metal materials, ceramics have higher processing accuracy, higher biocompatibility and mechanical strength, and good wear resistance and corrosion resistance.

[0024] The first rotor 300 is fixedly connected to one end of the rotating shaft 200, specifically, to the end of the rotating shaft 200 away from the connecting end 210. The first rotor 300 has a ball head portion 310, which protrudes along the axis of the rotating shaft 200 away from the connecting end 210. In the illustrated embodiment, the first rotor 300 is located within the housing 100. The first rotor 300 is located within the housing chamber 103. The first rotor 300 is rotatable relative to the housing 100 and can be rotated by driving the rotating shaft 200.

[0025] Specifically, the drive unit 10 further includes a stator 700, which can drive and rotate the first rotor 300. In the illustrated embodiment, the stator 700 is fixedly mounted within the housing 100, specifically located within the housing chamber 103, and the rotating shaft 200 is provided rotatably through the stator 700. In one embodiment, the first rotor 300 is magnetic, and the stator 700 can generate a rotating magnetic field that drives and rotates the first rotor 300.

[0026] 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, together with the first flywheel 320, constitutes the rotor body of the first rotor 300. The first magnet 330 is an annular Halbach array magnet. Specifically, the ball head portion 310 is provided 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 increased, and the oscillation of the rotating shaft 200 during rotation can be reduced. In this way, the entire rotating shaft 200 becomes more stable during rotation.

[0027] Specifically, referring further to Figure 5, the first flywheel 320 includes a first disc portion 321, a first internal tube 322, and a first external tube 323, both of which have a cylindrical structure, and the first disc portion 321 has 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 portion 321. The first internal tube 322 and the first external tube 323 are located on the same side of the first disc portion 321 and are provided coaxially, the inner diameter of the first external tube 323 is larger than the outer diameter of the first internal tube 322, at least a portion of the first internal tube 322 is housed in the first external tube 323, and a first annular chamber 324 for housing the first magnet 330 is formed between the first external tube 323 and the first internal tube 322. The shape of the first annular chamber 324 is matched to the shape of the first magnet 330 to facilitate the mounting and positioning of the first magnet 330. In this way, the first flywheel 320 can act as a position limiting force on the first magnet 330, not only facilitating the mounting of the first magnet 330 but also making the coupling between the first magnet 330 and the first flywheel 320 more stable.

[0028] Specifically, one end of the rotating shaft 200 away from the connecting end 210 is fixedly housed in the first internal tube 322, meaning that the rotating shaft 200 does not penetrate the first disk portion 321, allowing the drive unit 10 to be designed to be shorter. The ball head portion 310 is located on the side of the first disk portion 321 away from the first internal tube 322.

[0029] Referring further to Figures 6 and 7, specifically, the first rotor 300 further includes a connecting column portion 340, one end of which is fixedly connected to the rotor body, and the ball head portion 310 is formed at the end of the connecting column portion 340 that is separated from the rotor body. In other words, the end of the connecting column portion 340 that is separated from the ball head portion 310 is fixedly connected to the first flywheel 320 (specifically, the first disc portion 321). The axis of the connecting column portion 340 coincides with the axis of the rotation axis 200. In the illustrated embodiment, the ball head portion 310 is substantially hemispherical and has a spherical crown surface 311 and a circular base surface connected to the spherical crown surface 311. The circular base surface is connected to the end face of the connecting column portion 340, the connecting column portion 340 is coaxial with the ball head portion 310, and the diameter of the end face of one end of the connecting column portion 340 that is close to the ball head portion 310 is equal to the diameter of the circular base surface.

[0030] The first flywheel 320 is not limited to the above structure. In some embodiments, the first flywheel 320 does not have the first external tube 323. In some embodiments, the first flywheel 320 does not have the first external tube 323 and the first internal tube 322. In this case, the rotating shaft 200 is fixedly provided penetrating the center of the first disc portion 321. By providing the first internal tube 322 to the first flywheel 320 which has only the first disc portion 321, the first flywheel 320 and the rotating shaft 200 can be connected more stably.

[0031] Referring to Figures 2 and 3, both the first shaft sleeve 400 and the second shaft sleeve 500 are attached to the housing 100. Specifically, the first shaft sleeve 400 is housed in a housing chamber 103, and the second shaft sleeve 500 is housed in a position limiting chamber 102. Both the first shaft sleeve 400 and the second shaft sleeve 500 are fixedly connected to the housing 100. The first shaft sleeve 400 and the second shaft sleeve 500 are spaced apart along the axial direction of the housing 100, and the rotating shaft 200 is rotatably inserted through the second shaft sleeve 500, with the second shaft sleeve 500 being closer to the connection end 210 of the rotating shaft 200 than the first shaft sleeve 400. The first rotor 300 is located between the first shaft sleeve 400 and the second shaft sleeve 500, and the stator 700 is also located between the first shaft sleeve 400 and the second shaft sleeve 500.

[0032] Specifically, the first shaft sleeve 400 has a groove 410 formed therein, and the groove 410 has an inwardly recessed spherical groove wall 412. The ball head portion 310 of the first rotor 300 is movably provided within the groove 410, and the ball head portion 310 can contact the spherical groove wall 412. The groove 410 can support and restrict the position of the ball head portion 310 of the first rotor 300, thereby limiting the range in which the first rotor 300 and the rotating shaft 200 move away from the impeller 20 along the axis of the rotating shaft 200, and also limiting the range of oscillation of the rotating shaft 200 in the radial direction.

[0033] Referring to Figures 8 and 9, specifically, a portion of the connecting column 340 is housed in the groove 410, the groove 410 has a groove opening 413, and the connecting column 340 is provided penetrating the groove opening 413. The length h of the ball head portion 310 in the axial direction of the rotating shaft 200 is smaller than the depth s of the groove 410 (the depth s of the groove 410 is the maximum distance from the groove opening 413 of the groove 410 to the spherical groove wall 412), thereby better confining the ball head portion 310 within the groove 410 and reducing the oscillation range of the first rotor 300 and the rotating shaft 200 in the radial direction. In the illustrated embodiment, the radius of the spherical groove wall 412 is larger than the radius of the ball head portion 310, that is, the radius of the sphere in which the spherical groove wall 412 is located is larger than the radius of the sphere in which the ball head portion 310 is located. The length L of the spherical groove wall 412 in the axial direction of the first shaft sleeve 400 is less than the depth s of the recessed groove 410.

[0034] Specifically, the groove opening 413 of the recessed groove 410 is chamfered, meaning that the groove wall at the groove opening 413 of the recessed groove 410 is chamfered to prevent the connecting column portion 340 from being damaged and worn by the groove opening 413 of the recessed groove 410, which has corners.

[0035] Specifically, the ball head portion 310 is provided with a diamond coating to make its surface smooth and improve wear resistance.

[0036] Specifically, the first axial sleeve 400 is further formed with a fluid passage hole 420 that communicates with the groove 410. The fluid passage hole 420 can communicate fluidly with the cleaning line in the catheter 50 so that cleaning fluid enters the groove 410 through the fluid passage hole 420. When the cleaning fluid enters between the groove wall of the groove 410 and the ball head portion 310, it can act as a lubricant, reducing friction between the ball head portion 310 and the groove wall of the groove 410, and reducing wear on the ball head portion 310 and the first axial sleeve 400.

[0037] Specifically, one opening 421 of the fluid passage hole 420 is located at the center of the spherical groove wall 412, thereby providing the cleaning fluid entering the groove 410 from the fluid passage hole 420 with as much axial impact force as possible to the ball head portion 310. More specifically, the central axis of the fluid passage hole 420 coincides with the central axis of the chamber surrounded by the spherical groove wall 412, thereby reducing the energy consumption of the cleaning fluid in the fluid passage hole 420 by making it a straight hole.

[0038] Specifically, the diameter of the opening 421 located in the spherical groove wall 412 of the fluid passage hole 420 is 1 / 9 to 1 / 3 of the diameter of the sphere in which the ball head portion 310 is located. In the illustrated embodiment, the diameter of the fluid passage hole 420 is constant, that is, the diameter of the fluid passage hole 420 is 1 / 9 to 1 / 3 of the diameter of the sphere in which the ball head portion 310 is located. If the diameter of the opening 421 located in the spherical groove wall 412 of the fluid passage hole 420 is too large, the contact surface between the ball head portion 310 and the spherical groove wall 412 becomes smaller (the pressure received per unit area increases), which increases the wear of the ball head portion 310 by the spherical groove wall 412. If the diameter of the opening 421 is too small, it will affect the amount of cleaning fluid that enters the groove 410 from the fluid passage hole 420. The cleaning fluid that enters the groove 410 applies an impact force to the ball head portion 310 and at the same time enters the space between the ball head portion 310 and the spherical groove wall 412, providing lubrication and reducing the coefficient of friction between the ball head portion 310 and the spherical groove wall 412. Therefore, it is undesirable for the amount of cleaning fluid that enters the groove 410 to be too small.

[0039] Referring to Figures 2, 4, and 10, specifically, the drive unit 10 further includes a fixed seat 810 fixedly connected to the housing 100. The fixed seat 810 has a mounting chamber 811 and an inlet hole 812 communicating with the mounting chamber 811, and the first axial sleeve 400 is attached to the mounting chamber 811. A fluid passage hole 420 communicates with the inlet hole 812. One end of the inlet hole 812 away from the mounting chamber 811 communicates with the cleaning line of the catheter 50, thereby allowing the cleaning fluid to flow between the groove wall of the groove 410 and the ball head portion 310 via the inlet hole 812 and the fluid passage hole 420 before flowing into the chamber of the housing 100.

[0040] Specifically, the mounting chamber 811 has a chamber bottom 8111, and one opening 8121 (see Figure 4) of the liquid inlet hole 812 is located in the chamber bottom 8111 of the mounting chamber 811. A support step 8112 is provided inside the mounting chamber 811, and the support step 8112 abuts against the first shaft sleeve 400, separating the first shaft sleeve 400 and the chamber bottom 8111 by a certain distance, thereby better ensuring the smooth flow of the cleaning fluid. Specifically, the support step 8112 abuts against the surface of the first shaft sleeve 400 that is away from the second shaft sleeve 500.

[0041] Specifically, a branched channel 813 is further formed in the fixed seat 810, and the branched channel 813 is in fluid communication with the inlet hole 812, so that the fluid (e.g., cleaning fluid) flowing through the inlet hole 812 can further flow into the housing 100 via the branched channel 813. Specifically, one end of the branched channel 813 communicates with the gap between the first shaft sleeve 400 and the chamber bottom 8111 of the mounting chamber 811, and the other end communicates with the housing chamber 103. In the illustrated embodiment, the branched channel 813 is formed by a recess in a part of the chamber wall of the mounting chamber 811. In other words, under normal conditions, the cleaning fluid enters the mounting chamber 811 from the inlet hole 812 and then branches into two: one flows into the groove 410 of the first shaft sleeve 400 via the fluid passage hole 420, and the other flows out via the branched channel 813. By providing the branched channel 813, the flow of cleaning fluid can be guaranteed even if the ball head portion 310 blocks the fluid passage hole 420.

[0042] In the illustrated embodiment, there are two branch channels 813, and the two branch channels 813 are arranged opposite each other. The number of branch channels 813 can be adjusted as needed for the design; for example, in some embodiments, the number of branch channels 813 may be one or more.

[0043] Referring to Figures 2 and 11, the second shaft sleeve 500 abuts against the partition ring 110. In the illustrated embodiment, the second shaft sleeve 500 is housed in the position limiting chamber 102, and the assembly of the second shaft sleeve 500 can be facilitated by positioning the second shaft sleeve 500 with the partition ring 110. The second shaft sleeve 500 has a shaft hole 510, and the rotating shaft 200 is provided rotatably through the shaft hole 510. 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 shaft sleeve 400. There is a gap between the hole wall of the shaft hole 510 of the second shaft sleeve 500 and the rotating shaft 200 through which fluid flows. The cleaning fluid that enters the housing chamber 103 can flow through the gap between the rotating shaft 200 and the hole wall of the shaft hole 510 and flow out of the housing 100.

[0044] The position limiting member 600 is fixedly connected to the rotating shaft 200 and is located between the second shaft sleeve 500 and the first rotor 300. The position limiting member 600 can contact the second shaft sleeve 500, thereby limiting the range in which the rotating shaft 200 moves in the direction approaching the second shaft sleeve 500 along the axis of the rotating shaft 200. In the illustrated embodiment, the stator 700 is located between the first rotor 300 and the position limiting member 600.

[0045] Referring to Figures 2, 3, and 11, the position limiting member 600 includes a thrust ring 610 and a second rotor 620, the second rotor 620 being fixedly connected to the rotating shaft 200, and the thrust ring 610 being fixedly connected to at least one of the second rotor 620 and the rotating shaft 200. In other words, the thrust ring 610 may be directly fixed to the second rotor 620 only, or directly fixed to the rotating shaft 200 only, or directly fixed to both the second rotor 620 and the rotating shaft 200 simultaneously. Because the second rotor 620 is fixedly connected to the rotating shaft 200 and the thrust ring 610 is fixedly connected to at least one of the second rotor 620 and the rotating shaft 200, the three components—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 abuts against the second shaft sleeve 500, thereby limiting the range in which the rotating shaft 200 moves in a direction that approaches the impeller 20 along its axial direction.

[0046] Furthermore, the first rotor 300 is fixedly connected to one end of the rotating shaft 200, and the ball head portion 310 of the first rotor 300 is provided in the groove 410 of the first shaft sleeve 400 and can abut against the spherical groove wall 412 of the groove 410, thereby limiting the range in which the rotating shaft 200 moves away from the impeller 20 along the axis of the rotating shaft 200, and thus achieving positional limitation of the rotating shaft 200 along the axis of the rotating shaft 200. In addition, since the rotating shaft 200 is provided penetrating the second shaft sleeve 500 and the ball head portion 310 is provided in the groove 410 of the first shaft sleeve 400, the groove wall of the groove 410 of the first shaft sleeve 400 can limit the swing range of the ball head portion 310 in the radial direction of the rotating shaft 200, thereby achieving overall limitation of the swing range of the rotating shaft 200 in the radial direction. In other words, the above design not only achieves axial position constraints with respect to the rotation axis 200, but also radial position constraints with respect to the rotation axis 200.

[0047] The second rotor 620 is housed in the housing chamber 103, and the partition ring 110 is located between the second rotor 620 and the second shaft sleeve 500. Specifically, the second rotor 620 includes a second flywheel 621 and a second magnet 622, the second flywheel 621 is fixedly connected 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 increased, and the oscillation of the rotating shaft 200 during rotation can be reduced, thus making the entire rotating shaft 200 more stable during rotation.

[0048] Preferably, the second magnet 622 is an annular Halbach array magnet.

[0049] Specifically, the second flywheel 621 includes a second disk section 6211, a second internal tube 6212, and a second external tube 6213, both of which have a cylindrical structure, while the second disk section 6211 has an annular disc structure. Both the second internal tube 6212 and the second external tube 6213 are fixedly connected to the second disk section 6211. The second external tube 6213 is provided so as to surround the second disk section 6211, and both the second internal tube 6212 and the second external tube 6213 are provided coaxially, with the rotating shaft 200 penetrating through the second internal tube 6212 and fixedly connected to the second internal tube 6212. A second annular chamber is formed between the second internal tube 6212 and the second external tube 6213. The second magnet 622 is housed in the second annular chamber. The shape of the second annular chamber is matched to the second magnet 622 to facilitate the mounting and positioning of the second magnet 622. In this way, the second flywheel 621 can act as a position limiting force for the second magnet 622, not only facilitating the mounting of the second magnet 622 but also making the coupling between the second magnet 622 and the second flywheel 621 more stable.

[0050] The second flywheel 621 is not limited to the above structure. 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 rotating shaft 200 is fixedly provided penetrating the center of the second disc portion 6211. By providing the second internal tube 6212 to the second flywheel 621 which has only the second disc portion 6211, the second flywheel 621 and the rotating shaft 200 can be connected more stably.

[0051] In the illustrated embodiment, the thrust ring 610 is an annular projection formed on the side of the second flywheel 621 away from the stator 700. More specifically, the thrust ring 610 is provided on the side of the second disc portion 6211 away from the second internal tube 6212. That is, the thrust ring 610 and the second flywheel 621 are integrally molded structures and are formed as a single unit. Because the overall volume of the blood pump 1 is small, the volume of the thrust ring 610 is even smaller, making machining precision difficult and assembly difficult, integrally molding the thrust ring 610 and the second flywheel 621 makes installation easier and eliminates the need for adhesive bonding.

[0052] In other embodiments, the thrust ring 610 and the second rotor 620 may be separate structures before assembly. In this case, the thrust ring 610 may be fixed to at least one of the second rotor 620 and the rotating shaft 200 by adhesive or welding.

[0053] Specifically, when the thrust ring 610 contacts the second shaft sleeve 500, at least a portion of the thrust ring 610 is located on the inner ring of the partition ring 110, there is a gap through which fluid can flow between the thrust ring 610 and the inner wall of the partition ring 110, and there is a certain distance between the partition ring 110 and the second rotor 620. By having a gap through which fluid can flow between the thrust ring 610 and the inner wall of the partition ring 110, the cleaning fluid can flow into the shaft hole 510 of the second shaft sleeve 500 through the gap between the thrust ring 610 and the inner wall of the partition ring 110, that is, fluid communication is achieved between the shaft hole 510 of the second shaft sleeve 500 and the housing chamber 103. When the thrust ring 610 contacts the second shaft sleeve 500, the partition ring 110 and the second rotor 620 are separated by a certain distance, thereby preventing friction and wear from occurring when the thrust ring 610 contacts the second shaft sleeve 500.

[0054] Specifically, the thrust ring 610 is substantially annular, and the central axis of the thrust ring 610 coincides with the axis of the rotation axis 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 wall of the partition ring 110 through which fluid can flow. In other embodiments, the thrust ring 610 may consist of a plurality of sector-shaped rings arranged in a manner, where the plurality of sector-shaped rings are arranged at equal intervals around the rotation axis 200, or where the plurality of sector-shaped rings are arranged discretely in the circumferential direction.

[0055] 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 contacts the second shaft sleeve 500, there is a certain distance between the partition ring 110 and the second rotor 620. In some embodiments, however, the thickness of the thrust ring 610 along the axis of the rotating shaft 200 may be less than or equal to the thickness of the partition ring 110 along the axis of the rotating shaft 200, in which case the second rotor 620 and the thrust ring 610 may be separated by a certain distance in the direction along the axis of the rotating shaft 200, and this distance allows the partition ring 110 and the second rotor 620 to be separated by a certain distance when the thrust ring 610 contacts the second shaft sleeve 500.

[0056] Specifically, referring to Figure 12, a portion of the surface of the second shaft sleeve 500 facing the thrust ring 610 is recessed to form a flow guide groove 530, the flow guide groove 530 communicates with the shaft hole 510 of the second shaft sleeve 500, and when the thrust ring 610 contacts the second shaft sleeve 500, a portion of the flow guide groove 530 is not covered by the thrust ring 610, and when the thrust ring 610 contacts the second shaft sleeve 500, the thrust ring 610 closes the gap between the shaft hole 510 of the second shaft sleeve 500 and the rotating shaft 200, but the flow guide groove 530 that is not covered by the thrust ring 610 enables fluid communication when the thrust ring 610 contacts the second shaft sleeve 500, and can guarantee smooth flow of the cleaning fluid. Furthermore, by recessing a portion of the surface of the second shaft sleeve 500 facing the thrust ring 610 to form a flow guide groove 530, the cleaning fluid flows better between the thrust ring 610 and the second shaft sleeve 500, providing lubrication to the contact surfaces between the thrust ring 610 and the second shaft sleeve 500, reducing friction between the thrust ring 610 and the second shaft sleeve 500, reducing wear problems caused by friction between the thrust ring 610 and the second shaft sleeve 500, and providing heat dissipation to the thrust ring 610 and the second shaft sleeve 500.

[0057] Specifically, the thrust ring 610 has a stopper surface 611 which is perpendicular to the axis of the rotating shaft 200, and the second shaft sleeve 500 has a locking surface 520 which is perpendicular to the central axis of the shaft hole 510 of the second shaft sleeve 500, the locking surface 520 faces the stopper surface 611, and the locking surface 520 abuts against the stopper surface 611, thereby restricting the rotating shaft 200 from moving in a direction toward the impeller 20 along the axis of the rotating shaft 200. Since the stopper surface 611 is perpendicular to the axis of the rotating shaft 200, and the locking surface 520 is perpendicular to the central axis of the shaft hole 510 of the second shaft sleeve 500, and the rotating shaft 200 is rotatably mounted through the shaft hole 510 of the second shaft sleeve 500, when the rotating shaft 200 operates normally and the thrust ring 610 contacts the second shaft sleeve 500, the stopper surface 611 and the locking surface 520 can make surface contact, thereby reducing frictional wear between the thrust ring 610 and the second shaft sleeve 500. Specifically, the locking surface 520 contacts the partition ring 110. The flow guide groove 530 is formed by recessing a part of the locking surface 520.

[0058] Specifically, the roughness of at least one of the stopper surface 611 and the locking surface 520 is 0.1 micrometers or less. In some embodiments, the roughness of both the stopper surface 611 and the locking surface 520 is 0.1 micrometers or less. In some embodiments, the roughness of at least one of the stopper surface 611 and the locking surface 520 is 0.1 micrometers or less. By reducing the roughness of at least one of the stopper surface 611 and the locking surface 520, the frictional force between the stopper surface 611 and the locking surface 520 can be effectively reduced, thereby reducing the problem of frictional wear between the second shaft sleeve 500 and the thrust ring 610.

[0059] In some embodiments, at least one of the stopper surface 611 and the locking surface 520 is a ceramic surface. Ceramics have high processing accuracy, high biocompatibility, high mechanical strength, and good wear resistance and corrosion resistance. In this case, the material of the thrust ring 610 and the second shaft sleeve 500 may be ceramic, or at least one of the stopper surface 611 and the locking surface 520 can be a ceramic surface by providing a ceramic coating. In some embodiments, the material of the stopper surface 611 is diamond, thereby the stopper surface 611 has high hardness and a smooth surface and is resistant to wear, and in this case, the material of the stopper surface 611 can be a ceramic surface by providing a diamond coating.

[0060] Specifically, referring to Figures 2 and 13, the stator 700 includes a first stator unit 710 and a second stator unit 720, which are provided along the axis of the rotating shaft 200. The first stator unit 710 can drive and rotate the first rotor 300, and the second stator unit 720 can drive and rotate the second rotor 620. Specifically, the first stator unit 710 can generate a rotating magnetic field that drives and rotates the first rotor 300, and the second stator unit 720 can generate a rotating magnetic field that drives and rotates the second rotor 620. Both the first stator unit 710 and the second stator unit 720 are fixedly housed in a housing chamber 103 of the housing 100. The rotating shaft 200 is provided rotatably 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 shaft sleeve 400 and the second shaft sleeve 500, with the first rotor 300 being located close to the first shaft sleeve 400 and the second rotor 620 being located close to the second shaft sleeve 500. In other words, the first shaft sleeve 400, the first rotor 300, the first stator unit 710, the second stator unit 720, the second rotor 620, and the second shaft sleeve 500 are arranged in order along the axis of the rotating shaft 200, with the second shaft sleeve 500 being closest to the connecting end 210 of the rotating shaft 200.

[0061] The first stator unit 710 and the second stator unit 720 both include a magnetic core and a coil, the coil being wound around the magnetic core. Specifically, the first stator unit 710 includes a first magnetic core 711 and a first coil 712, the first coil 712 being wound around the first magnetic core 711. There are multiple first magnetic cores 711, which are arranged around the axis of the rotation shaft 200. Each first magnetic core 711 is provided with one first coil 712.

[0062] The structure of the second stator unit 720 is the same as that of the first stator unit 710. The second stator unit 720 includes a second magnetic core 721 and a second coil 722, the second coil 722 being wound around the second magnetic core 721. There are multiple second magnetic cores 721, which are arranged around the axis of the rotation shaft 200. Each second magnetic core 721 is provided with one second coil 722.

[0063] Specifically, the drive unit 10 further includes a permeable member 820 fixedly connected to the housing 100, and 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 permeable member 820. Specifically, the permeable member 820 is fixedly housed within the housing 100 and, for example, is locked to the inner wall of the housing 100. The rotating shaft 200 is provided rotatably through the permeable member 820. One end of the first magnetic core 711 is fixedly connected to the permeable member 820, the first rotor 300 is provided close to the other end of the first magnetic core 711, one end of the second magnetic core 721 is fixedly connected to the permeable member 820, and the second rotor 620 is provided close to the other end of the second magnetic core 721.

[0064] The permeable member 820 plays a role in closing the magnetic path, promoting and increasing the generation of magnetic flux and improving coupling ability. By providing the permeable member 820, the magnetic path between the first stator unit 710 and the first rotor 300, and the magnetic path between the second stator unit 720 and the second rotor 620 can be closed, increasing the magnetic flux and further contributing to reducing the overall diameter of the drive unit 10. In addition, by permanently connecting both 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 permeable member 820, the positioning and mounting of the first stator unit 710 and the second stator unit 720 can be achieved, reducing the difficulty of assembling the first stator unit 710 and the second stator unit 720. At the same time, the permeable member 820 provided as described above can also reduce the installation of positioning structures within the housing 100, simplifying the structure of the housing 100 and simplifying the overall assembly process of the drive unit 10.

[0065] Specifically, the permeable member 820 includes two permeable plates 821, which are stacked, one permeable plate 821 is fixedly connected to the first magnetic core 711 of the first stator unit 710, and the other permeable plate 821 is fixedly connected to the second magnetic core 721 of the second stator unit 720, and the rotating shaft 200 is provided rotatably through the two permeable plates 821. Specifically, the two permeable plates 821 are separate before assembly, and by providing the permeable member 820 as two separate permeable plates 821 before assembly, when assembling the drive unit 10, the first magnetic core 711 can be fixedly connected to the permeable plate 821 first, the second magnetic core 721 can be fixedly connected to the other permeable plate 821 first, and then the two permeable plates 821 can be stacked. In this way, it becomes convenient to assemble the first magnetic core 711 and the second magnetic core 721 onto two permeable plates 821, and the assembly of the first magnetic core 711 and the second magnetic core 721 becomes more convenient.

[0066] Specifically, by fixing the two permeable plates 821 together, the first stator unit 710, the second stator unit 720, and the permeable member 820 are integrated and assembled within the housing 100, making the assembly of the stator 700 easier. For example, the two permeable plates 821 may be connected by adhesive or welding. In other embodiments, the two permeable plates 821 are not fixedly connected but are in contact with each other.

[0067] Furthermore, the permeable member 820 is not limited to a configuration in which the two separate permeable plates 821 described above are combined; the permeable member 820 may also have a plate-like structure, and both the first magnetic core 711 and the second magnetic core 721 are connected to the permeable member 820, that is, the first stator unit 710 and the second stator unit 720 share one permeable member 820.

[0068] Specifically, the permeable plate 821 is made of silicon steel, and the first magnetic core 711 and the second magnetic core 721 are made of silicon steel.

[0069] Both the first magnetic core 711 and the second magnetic core 721 have a columnar structure and lack a wide head (i.e., a pole piece). Compared to magnetic cores with pole pieces, the columnar magnetic core reduces magnetic loss and increases the magnetic coupling density between the magnetic core and the magnet, thereby increasing the torque on the magnet of the stator 700 (under the same current conditions). Furthermore, magnetic cores without heads can significantly reduce problems such as localized magnetic short circuits and motor power reduction caused by contact between adjacent magnetic cores.

[0070] The structure of the drive unit 10 is not limited to the structure described above. In some embodiments, the drive unit 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, it has 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 simultaneously drive and rotate the first rotor 300 and the second rotor 620.

[0071] The position limiting member 600 is not limited to the structure described above. In some embodiments, the position limiting member 600 consists only of a thrust ring 610 and does not have a second rotor 620, in which case the stator 700 has only one stator unit. The thrust ring 610 is fixedly connected to the rotating shaft 200 and abuts against the second shaft sleeve 500, limiting the range in which the rotating shaft 200 moves along its axis in a direction approaching the second shaft sleeve 500. In some embodiments, the position limiting member 600 consists only of the second rotor 620 and does not have a thrust ring 610. In this case, the second rotor 620 is fixedly connected 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 shaft sleeve 500 or the partition ring 110, limiting the range in which the rotating shaft 200 moves along its axis in the direction approaching the impeller 20.

[0072] Since the drive device of this embodiment has the same structure as the drive device of the first embodiment, the drive device of this embodiment and the blood pump equipped therewith also have the same effects as the first embodiment.

[0073] The above embodiments are merely for illustrating the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the embodiments described above, those skilled in the art can modify the technical solutions described in each of the embodiments described above, or make equivalent substitutions for some of the technical features thereof. Such modifications and substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of each embodiment of the present invention, and should all be included within the scope of protection of the present invention.

Claims

1. A drive device, Housing and A rotating shaft configured to connect to the impeller and rotatably mounted in the housing, A first rotor is fixedly connected to one end of the rotating shaft and has a ball head portion that protrudes along the axis of the rotating shaft, A first shaft sleeve attached to the housing, wherein the first shaft sleeve has a recessed groove having a recessed spherical groove wall, the ball head portion is movably provided within the recessed groove and is capable of contacting the spherical groove wall, A second shaft sleeve attached to the housing, wherein the rotating shaft is provided rotatably through the second shaft sleeve, and the first rotor is located between the first shaft sleeve and the second shaft sleeve, The position limiting member includes a position that is fixedly connected to the rotating shaft, located between the second shaft sleeve and the first rotor, and capable of contacting the second shaft sleeve, The drive device is characterized in that the first rotor includes a first flywheel and a first magnet, the first flywheel is fixedly connected to the rotating shaft, the first magnet is fixedly connected to the first flywheel, the ball head portion is provided on the first flywheel, and the drive device further includes a stator, the stator is located between the first rotor and the position limiting member and is capable of generating a rotating magnetic field that drives the rotation of the first magnet.

2. The drive device according to claim 1, wherein the first flywheel includes a first disc portion, a first internal tube, and a first external tube, one end of both the first internal tube and the first external tube fixedly connected to the first disc portion, the first internal tube and the first external tube are located on the same side of the first disc portion and are provided coaxially, the inner diameter of the first external tube is larger than the outer diameter of the first internal tube, at least a portion of the first internal tube is housed in the first external tube, a first annular chamber for housing the first magnet is formed between the first external tube and the first internal tube, the rotating shaft has a connecting end configured to be connected to the impeller, one end of the rotating shaft away from the connecting end is fixedly housed in the first internal tube, and the ball head portion is located on the side of the first disc portion away from the first internal tube.

3. The drive device according to claim 1, characterized in that the first shaft sleeve further has a fluid passage hole communicating with the groove, the drive device further includes a fixed seat fixedly connected to the housing, the fixed seat has a mounting chamber and an inlet hole communicating with the mounting chamber, the first shaft sleeve is attached to the mounting chamber, and the fluid passage hole is in fluid communication with the inlet hole.

4. The mounting chamber has a chamber bottom, the opening of the liquid inlet hole is located at the bottom of the chamber, a support step is provided inside the mounting chamber, the support step contacts the first shaft sleeve and separates the first shaft sleeve and the bottom of the chamber by a certain distance, and / or, a branch channel is further formed in the fixed seat, and the branch channel communicates with the inlet hole, so that the fluid that enters the inlet hole can further flow into the housing via the branch channel. The drive device according to claim 3, characterized in that and / or, the opening of the liquid passage hole is located in the spherical groove wall, the opening is located at the center of the spherical groove wall, and the diameter of the opening is 1 / 9 to 1 / 3 of the diameter of the sphere in which the ball head portion is located.

5. The drive device according to claim 3, characterized in that the groove opening of the recessed groove is rounded, and the ball head portion is provided with a diamond coating.

6. The drive device according to claim 1, wherein the first rotor further includes a rotor body and a connecting column portion having one end fixedly connected to the rotor body, the rotor body is fixedly connected to the rotating shaft, the ball head portion is formed at the end of the connecting column portion that is separated from the rotor body, the length of the ball head portion in the axial direction of the rotating shaft is less than the depth of the groove, and a part of the connecting column portion is housed in the groove.

7. The drive device according to claim 6, wherein the ball head portion is provided in a hemispherical shape, the ball head portion has a spherical crown surface and a circular base surface connected to the spherical crown surface, the circular base surface is connected to the end face of the connecting column portion, the connecting column portion is coaxial with the ball head portion, and the diameter of the end face of one end of the connecting column portion adjacent to the ball head portion is equal to the diameter of the circular base surface.

8. The drive device according to claim 1, wherein the position limiting member includes a second rotor and a thrust ring, the second rotor is fixedly connected to the rotating shaft, the thrust ring is fixedly connected to at least one of the second rotor and the rotating shaft, and the thrust ring is capable of contacting the second shaft sleeve.

9. The drive device according to claim 8, wherein the second rotor includes a second flywheel and a second magnet, the second flywheel being fixedly connected to the rotating shaft, the second magnet being fixedly connected to the second flywheel, the drive device further includes a stator, the stator being located between the first rotor and the second rotor and capable of generating a rotating magnetic field that drives the rotation of the second magnet, and the thrust ring is an annular projection formed on the side of the second flywheel away from the stator.

10. A drive device, Housing and A rotating shaft configured to connect to the impeller and rotatably mounted in the housing, A first rotor is fixedly connected to one end of the rotating shaft and has a ball head portion that protrudes along the axis of the rotating shaft, A first shaft sleeve attached to the housing, wherein the first shaft sleeve has a recessed groove having a recessed spherical groove wall, the ball head portion is movably provided within the recessed groove and is capable of contacting the spherical groove wall, A second shaft sleeve attached to the housing, wherein the rotating shaft is provided rotatably through the second shaft sleeve, and the first rotor is located between the first shaft sleeve and the second shaft sleeve, The position limiting member includes a position that is fixedly connected to the rotating shaft, located between the second shaft sleeve and the first rotor, and capable of contacting the second shaft sleeve, The position limiting member includes a second rotor and a thrust ring, the second rotor being fixedly connected to the rotating shaft, the thrust ring being fixedly connected to at least one of the second rotor and the rotating shaft, and the thrust ring being able to contact the second shaft sleeve. The drive device is characterized in that the second rotor includes a second flywheel and a second magnet, the second flywheel is fixedly connected to the rotating shaft, the second magnet is fixedly connected to the second flywheel, the drive device further includes a stator, the stator is located between the first rotor and the second rotor and is capable of generating a rotating magnetic field that drives the rotation of the second magnet, and the thrust ring is an annular projection formed on the side of the second flywheel away from the stator.

11. A partition ring is provided within the housing, and the partition ring divides the chamber of the housing into a position-limiting chamber and a housing chamber, the partition ring is located between the second shaft sleeve and the second rotor, the second shaft sleeve is housed in the position-limiting chamber and abuts against the partition ring, and the second rotor is housed in the housing chamber. The drive device according to claim 8, characterized in that when the thrust ring contacts the second shaft sleeve, at least a portion of the thrust ring is located on the inner ring of the partition ring, there is a gap for fluid to flow between the thrust ring and the inner ring wall of the partition ring, and there is a certain distance between the partition ring and the second rotor.

12. Housing and A rotating shaft configured to connect to the impeller and rotatably mounted in the housing, A first rotor is fixedly connected to one end of the rotating shaft and has a ball head portion that protrudes along the axis of the rotating shaft, A first shaft sleeve attached to the housing, wherein the first shaft sleeve has a recessed groove having a recessed spherical groove wall, the ball head portion is movably provided within the recessed groove and is capable of contacting the spherical groove wall, A second shaft sleeve attached to the housing, wherein the rotating shaft is provided rotatably through the second shaft sleeve, and the first rotor is located between the first shaft sleeve and the second shaft sleeve, The position limiting member includes a position that is fixedly connected to the rotating shaft, located between the second shaft sleeve and the first rotor, and capable of contacting the second shaft sleeve, The position limiting member includes a second rotor and a thrust ring, the second rotor being fixedly connected to the rotating shaft, the thrust ring being fixedly connected to at least one of the second rotor and the rotating shaft, and the thrust ring being able to contact the second shaft sleeve. A partition ring is provided within the housing, and the partition ring divides the chamber of the housing into a position-limiting chamber and a housing chamber, the partition ring is located between the second shaft sleeve and the second rotor, the second shaft sleeve is housed in the position-limiting chamber and abuts against the partition ring, and the second rotor is housed in the housing chamber. A drive device characterized in that, when the thrust ring contacts the second shaft sleeve, at least a portion of the thrust ring is located on the inner ring of the partition ring, there is a gap for fluid to flow between the thrust ring and the inner ring wall of the partition ring, and there is a certain distance between the partition ring and the second rotor.

13. The drive device according to claim 11 or 12, characterized in that the thickness of the thrust ring along the axis of the rotating shaft is greater than the thickness of the partition ring along the axis of the rotating shaft, so that when the thrust ring contacts the second shaft sleeve, there is a certain distance between the partition ring and the second rotor.

14. The drive device according to claim 8, wherein the thrust ring has a stopper surface, the stopper surface is perpendicular to the axis of the rotating shaft, the second shaft sleeve has a locking surface, the locking surface faces the stopper surface, the locking surface abuts against the stopper surface, the locking surface is provided with a flow guide groove, the flow guide groove communicates with the shaft hole of the second shaft sleeve for the flow of cleaning fluid, and when the locking surface abuts against the stopper surface, a portion of the flow guide groove is not covered by the thrust ring.

15. Housing and A rotating shaft configured to connect to the impeller and rotatably mounted in the housing, A first rotor is fixedly connected to one end of the rotating shaft and has a ball head portion that protrudes along the axis of the rotating shaft, A first shaft sleeve attached to the housing, wherein the first shaft sleeve has a recessed groove having a recessed spherical groove wall, the ball head portion is movably provided within the recessed groove and is capable of contacting the spherical groove wall, A second shaft sleeve attached to the housing, wherein the rotating shaft is provided rotatably through the second shaft sleeve, and the first rotor is located between the first shaft sleeve and the second shaft sleeve, The position limiting member includes a position that is fixedly connected to the rotating shaft, located between the second shaft sleeve and the first rotor, and capable of contacting the second shaft sleeve, The position limiting member includes a second rotor and a thrust ring, the second rotor being fixedly connected to the rotating shaft, the thrust ring being fixedly connected to at least one of the second rotor and the rotating shaft, and the thrust ring being able to contact the second shaft sleeve. The drive device is characterized in that the thrust ring has a stopper surface, the stopper surface is perpendicular to the axis of the rotating shaft, the second shaft sleeve has a locking surface, the locking surface faces the stopper surface, the locking surface abuts against the stopper surface, the locking surface is provided with a flow guide groove, the flow guide groove communicates with the shaft hole of the second shaft sleeve for the flow of cleaning fluid, and when the locking surface abuts against the stopper surface, a portion of the flow guide groove is not covered by the thrust ring.

16. The drive device according to claim 14 or 15, characterized in that the roughness of at least one of the stopper surface and the locking surface is 0.1 micrometers or less, or at least one of the stopper surface and the locking surface is a ceramic surface.

17. The drive device according to claim 8, characterized in that the thrust ring is provided in an annular shape, the central axis of the thrust ring coincides with the axis of the rotation shaft, or the thrust ring is made up of a plurality of sector-shaped rings arranged in a row, the plurality of sector-shaped rings are provided at equal intervals around the rotation shaft.

18. Housing and A rotating shaft configured to connect to the impeller and rotatably mounted in the housing, A first rotor is fixedly connected to one end of the rotating shaft and has a ball head portion that protrudes along the axis of the rotating shaft, A first shaft sleeve attached to the housing, wherein the first shaft sleeve has a recessed groove having a recessed spherical groove wall, the ball head portion is movably provided within the recessed groove and is capable of contacting the spherical groove wall, A second shaft sleeve attached to the housing, wherein the rotating shaft is provided rotatably through the second shaft sleeve, and the first rotor is located between the first shaft sleeve and the second shaft sleeve, The position limiting member includes a position that is fixedly connected to the rotating shaft, located between the second shaft sleeve and the first rotor, and capable of contacting the second shaft sleeve, The position limiting member includes a second rotor and a thrust ring, the second rotor being fixedly connected to the rotating shaft, the thrust ring being fixedly connected to at least one of the second rotor and the rotating shaft, and the thrust ring being able to contact the second shaft sleeve. The drive device is characterized in that the thrust ring is provided in an annular shape, the central axis of the thrust ring coincides with the axis of the rotation shaft, or the thrust ring is made up of a plurality of sector-shaped rings arranged in a circle, the plurality of sector-shaped rings are provided at equal intervals around the rotation shaft.

19. The drive device according to claim 9 or 10, characterized in that the thrust ring is integrally molded with the second flywheel of the second rotor, or the thrust ring is connected and fixed to at least one of the second rotor and the rotating shaft by adhesive or welding.

20. The drive device according to claim 8, further comprising a stator, the stator comprising a first stator unit and a second stator unit provided along the axis of the rotation shaft, the first stator unit and the second stator unit both located between the first rotor and the second rotor, the first stator unit capable of driving the rotation of the first rotor, and the second stator unit capable of driving the rotation of the second rotor.

21. Housing and A rotating shaft configured to connect to the impeller and rotatably mounted in the housing, A first rotor is fixedly connected to one end of the rotating shaft and has a ball head portion that protrudes along the axis of the rotating shaft, A first shaft sleeve attached to the housing, wherein the first shaft sleeve has a recessed groove having a recessed spherical groove wall, the ball head portion is movably provided within the recessed groove and is capable of contacting the spherical groove wall, A second shaft sleeve attached to the housing, wherein the rotating shaft is provided rotatably through the second shaft sleeve, and the first rotor is located between the first shaft sleeve and the second shaft sleeve, A position limiting member is fixedly connected to the rotating shaft, positioned between the second shaft sleeve and the first rotor, and capable of contacting the second shaft sleeve. Includes the status, The position limiting member includes a second rotor and a thrust ring, the second rotor being fixedly connected to the rotating shaft, the thrust ring being fixedly connected to at least one of the second rotor and the rotating shaft, and the thrust ring being able to contact the second shaft sleeve. The stator includes a first stator unit and a second stator unit provided along the axis of the rotation shaft, the first stator unit and the second stator unit are both located between the first rotor and the second rotor, the first stator unit is capable of driving the rotation of the first rotor, and the second stator unit is capable of driving the rotation of the second rotor, characterized in that the drive device.

22. The drive device according to claim 20 or 21, wherein the first stator unit includes a first magnetic core and a first coil, the first coil being wound around the first magnetic core; the second stator unit includes a second magnetic core and a second coil, the second coil being wound around the second magnetic core; and the drive device further includes a permeable member fixedly connected to the housing, the permeable member being fixedly connected to both the first magnetic core and the second magnetic core.

23. The drive device according to claim 22, wherein the permeable member includes two permeable plates, the two permeable plates are stacked, one of the permeable plates is fixedly connected to the first magnetic core, and the other permeable plate is fixedly connected to the second magnetic core.

24. A blood pump comprising an impeller and a drive device according to any one of claims 1, 10, 12, 15, 18, or 21, A blood pump characterized in that the rotating shaft is connected to the impeller and capable of driving the rotation of the impeller.

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