Driving device 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 priority to a Chinese patent application with application number CN202210801382.2, filed with the China National Intellectual Property Office on July 8, 2022, the entire contents of which are incorporated herein by reference.

[0002] (Technical field) The present application relates to the technical field of medical equipment, in particular to drives and blood pumps. [Background technology]

[0003] The blood pump is designed to be inserted percutaneously into a patient's blood vessel, for example the femoral or axillary artery or vein, and can be inserted into the patient's heart to function as a left ventricular assist device or a right ventricular assist device.

[0004] A blood pump typically includes a drive unit and an impeller. The impeller is connected to a drive shaft of the drive unit. In order to achieve stable rotation of the drive shaft, it is usually necessary to add a member to limit the position of the drive shaft, which makes the structure of the drive unit complex and makes assembly of the drive unit difficult. Summary of the Invention [Problem to be solved by the invention]

[0005] Based on this, the present application provides a drive device and a blood pump that are easy to assemble. [Means for solving the problem]

[0006] An embodiment of the first aspect of the present application is Housing and a rotating shaft configured to be connected to an impeller and rotatably mounted to the housing; a first rotor fixedly connected to one end of the rotating shaft and having a ball head portion protruding along an axis of the rotating shaft; a first shaft sleeve attached to the housing, the first shaft sleeve having a groove with a concave spherical groove wall formed therein, the ball head portion being movably disposed within the groove and capable of abutting against the spherical groove wall; the second shaft sleeve attached to the housing, the rotating shaft rotatably penetrating the second shaft sleeve, and the first rotor is a second shaft sleeve located between the first shaft sleeve and the second shaft sleeve; A drive device is provided, the drive device including: a position limiting member that is fixedly connected to the rotating shaft, that is located between the second shaft sleeve and the first rotor, and that is capable of abutting against the second shaft sleeve.

[0007] An embodiment of a second aspect of the present application provides a blood pump including an impeller and a drive device according to the first aspect, the rotation shaft being connected to the impeller and capable of driving the rotation of the impeller.

[0008] The details of one or more embodiments of the invention are set forth in the drawings and description which follow. Other features, objects, and advantages of the invention will become apparent from the description, drawings, and claims.

[0009] In order to more clearly explain the technical solutions in the embodiments of the present application, the drawings necessary for the description of the embodiments or the prior art will be briefly introduced below. It is obvious that the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without any creative efforts. [Brief description of the drawings]

[0010] [Figure 1] 1 is a structural schematic diagram of a blood pump according to an embodiment of the present invention. [Diagram 2] 2 is a cross-sectional view of the blood pump shown in FIG. 1 with the cannula, impeller, and some catheters omitted. [Diagram 3]2 is a cross-sectional view of the blood pump shown in FIG. 1 in which the rotating shaft, thrust ring, first rotor, second rotor, first shaft sleeve, and second shaft sleeve are assembled. [Figure 4] FIG. 3 is a partial enlarged view of part A shown in FIG. [Diagram 5] 3 is a schematic diagram showing the structure of a first flywheel of a first rotor shown in FIG. 2. [Figure 6] FIG. 6 is a cross-sectional view of the first flywheel shown in FIG. 5. [Figure 7] FIG. 7 is a partial enlarged view of part B shown in FIG. [Figure 8] 3 is a schematic diagram of the structure of a first shaft sleeve shown in FIG. 2. [Figure 9] FIG. 9 is a cross-sectional view of the first shaft sleeve shown in FIG. 8. [Figure 10] FIG. 3 is a structural schematic diagram of the fixed seat of the blood pump shown in FIG. 2. [Figure 11] FIG. 3 is a partially enlarged view of the blood pump shown in FIG. 2. [Figure 12] FIG. 3 is a structural schematic diagram of the second shaft sleeve of the blood pump shown in FIG. 2. [Figure 13] 2 is a schematic diagram of the blood pump shown in FIG. 1 in which a stator and a magnetic permeable member are assembled. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] In order to more clearly understand the objectives, technical solutions and advantages of the present application, the present application will be described in more detail below with reference to the accompanying drawings and examples. It should be understood that the specific examples described in this specification are only for interpreting the present application, and do not limit the present application.

[0012] It should be noted that when an element is referred to as being "fixed" or "mounted" on another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being "connected" to another element, it may be directly connected to the other element or indirectly connected to the other element.

[0013] Additionally, the terms "first" and "second" are merely descriptive and should not be understood to indicate or imply a relative importance or number of technical features being presented. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "plurality" means two or more, unless otherwise specified.

[0014] In the following, the technical means of the present application will be described with reference to specific drawings and examples.

[0015] In the field of interventional medicine, the end of an instrument closest to the operator is typically defined as the proximal end, and the end away from the operator as the distal end.

[0016] A blood pump 1 and a drive unit 10 according to an embodiment of the present invention will be described.

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

[0018] Specifically, blood pump 1 further includes a cannula 40 fixedly connected to a distal end of drive unit 10. Impeller 20 is rotatably received within cannula 40. Cannula 40 has a blood inlet 41 and a blood outlet 42. As impeller 20 rotates, blood enters cannula 40 through blood inlet 41 and then exits through blood outlet 42. In one embodiment, cannula 40 extends through a heart valve, e.g., aortic valve, blood inlet 41 is located within the heart, and blood outlet 42 and drive unit 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 a proximal 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 electrically connecting with the drive unit 10 and a flushing line for passing a flushing fluid through the blood pump 1. Preferably, the flushing fluid is saline, heparinized saline, glucose, or the like.

[0020] 2 to 4, 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.

[0021] The housing 100 is a generally cylindrical housing that is open at both ends. The distal end of the housing 100 is fixedly connected to the cannula 40, and the proximal end of the housing 100 is fixedly connected to the catheter 50. The housing 100 has a chamber. Specifically, a partition ring 110 is provided within the housing 100, and the partition ring 110 divides the chamber of the housing 100 into a position limiting chamber 102 and a storage chamber 103. In the illustrated embodiment, the position limiting chamber 102 and the storage 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 attached to the housing 100, and the rotating shaft 200 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 extension direction of the axis of the rotating shaft 200 and the axial direction of the housing 100 are generally coincident with each other, so that the position limiting chamber 102 and the accommodation 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, a part of the rotating shaft 200 is accommodated in the accommodation chamber 103, a part of the rotating shaft 200 is located outside the housing 100, or a part of the rotating shaft 200 extends within the cannula 40. Specifically, one end of the rotating shaft 200 configured to be connected to the impeller 20 is a connection end 210.

[0023] In some embodiments, the rotating shaft 200 is made of a ceramic material. Compared with metallic materials, ceramics have high processing precision, high biocompatibility, high 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, the first rotor 300 is fixedly connected to one end of the rotating shaft 200 away from the connecting end 210. The first rotor 300 has a ball head portion 310, which protrudes in a direction away from the connecting end 210 along the axis of the rotating shaft 200. In the illustrated embodiment, the first rotor 300 is located in the housing 100. The first rotor 300 is located in the receiving chamber 103. The first rotor 300 is rotatable relative to the housing 100 and can drive the rotating shaft 200 to rotate.

[0025] Specifically, the driving device 10 further includes a stator 700, and the stator 700 can drive the first rotor 300 to rotate. In the illustrated embodiment, the stator 700 is fixedly mounted in the housing 100, and the stator 700 is specifically located in the receiving chamber 103, and the rotating shaft 200 is rotatably provided 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 the first rotor 300 to rotate.

[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 constitutes a rotor body of the first rotor 300 together with the first flywheel 320. 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 shaking of the rotating shaft 200 during rotation can also be reduced, and thus the entire rotating shaft 200 becomes more stable during rotation.

[0027] Specifically, referring to FIG. 5, the first flywheel 320 includes a first disk portion 321, a first internal tube 322, and a first external tube 323, and both the first internal tube 322 and the first external tube 323 have a circular tubular structure, and the first disk portion 321 has an annular disk structure. One end of the first internal tube 322 and the first external tube 323 are both fixedly connected to the first disk portion 321. The first internal tube 322 and the first external tube 323 are located on the same side of the first disk portion 321 and are arranged coaxially, the inner diameter of the first external tube 323 is larger than the outer diameter of the first internal tube 322, and at least a portion of the first internal tube 322 is accommodated in the first external tube 323, and a first annular chamber 324 that accommodates 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 adapted to the shape of the first magnet 330, so as to facilitate the installation and positioning of the first magnet 330. In this way, the first flywheel 320 can play a position limiting role on the first magnet 330, which not only facilitates the installation of the first magnet 330, but also makes the coupling between the first magnet 330 and the first flywheel 320 more stable.

[0028] Specifically, one end of the rotating shaft 200 remote from the connection end 210 is fixedly accommodated in the first built-in tube 322, i.e., the rotating shaft 200 does not penetrate the first disk portion 321, so that the driving device 10 can be designed to be shorter. The ball head portion 310 is located on the side of the first disk portion 321 remote from the first built-in tube 322.

[0029] 6 and 7, specifically, the first rotor 300 further includes a connecting post 340 having one end fixedly connected to the rotor body, and the ball head portion 310 is formed at the end of the connecting post 340 away from the rotor body. In other words, the one end of the connecting post 340 away from the ball head portion 310 is fixedly connected to the first flywheel 320 (specifically, the first disk portion 321). The axis of the connecting post 340 overlaps with the axis of the rotating shaft 200. In the illustrated embodiment, the ball head portion 310 is substantially hemispherical, the ball head portion 310 has a spherical crown surface 311 and a circular bottom surface connected to the spherical crown surface 311, the circular bottom surface is connected to an end surface of the connecting post portion 340, the connecting post portion 340 is coaxial with the ball head portion 310, and the diameter of the end surface of one end of the connecting post portion 340 adjacent to the ball head portion 310 is equal to the diameter of the circular bottom surface.

[0030] The first flywheel 320 is not limited to the above structure, and in some embodiments, the first flywheel 320 does not have the first external pipe 323, and in some embodiments, the first flywheel 320 does not have the first external pipe 323 and the first built-in pipe 322, and in this case, the rotating shaft 200 is fixedly provided to penetrate through the center of the first disk portion 321. By providing the first built-in pipe 322 to the first flywheel 320 having only the first disk portion 321, the first flywheel 320 and the rotating shaft 200 can be connected more stably.

[0031] 2 and 3, the first shaft sleeve 400 and the second shaft sleeve 500 are both attached to the housing 100. Specifically, the first shaft sleeve 400 is accommodated in the accommodation chamber 103, and the second shaft sleeve 500 is accommodated in the position limiting chamber 102. The first shaft sleeve 400 and the second shaft sleeve 500 are both fixedly connected to the housing 100. The first shaft sleeve 400 and the second shaft sleeve 500 are spaced apart from each other along the axial direction of the housing 100, the rotating shaft 200 is rotatably inserted through the second shaft sleeve 500, and the second shaft sleeve 500 is closer to the connecting 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, a groove 410 is formed in the first shaft sleeve 400, and the groove 410 has a spherical groove wall 412 recessed inward. The ball head portion 310 of the first rotor 300 is movably provided in the groove 410, and the ball head portion 310 can abut against the spherical groove wall 412. The groove 410 can support and limit the position of the ball head portion 310 of the first rotor 300, thereby limiting the range of movement of the first rotor 300 and the rotating shaft 200 along the axis of the rotating shaft 200 in a direction away from the impeller 20, and limiting the swing range of the rotating shaft 200 in the radial direction of the rotating shaft 200.

[0033] 8 and 9, specifically, a part of the connecting post 340 is received in the groove 410, the groove 410 has a groove mouth 413, and the connecting post 340 is provided to penetrate the groove mouth 413. The length h of the ball head 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 mouth 413 of the groove 410 to the spherical groove wall 412), thereby better restricting the ball head 310 in the groove 410 and reducing the swing 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 310, i.e., the radius of the sphere on which the spherical groove wall 412 is located is larger than the radius of the sphere on which the ball head 310 is located. The length L of the spherical groove wall 412 in the axial direction of the first shaft sleeve 400 is smaller than the depth s of the recessed groove 410 .

[0034] Specifically, the groove mouth 413 of the groove 410 is rounded off, that is, the groove wall at the groove mouth 413 of the groove 410 is rounded off, thereby preventing the connecting post portion 340 from being scratched and worn by the groove mouth 413 of the 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 its wear resistance.

[0036] Specifically, the first shaft sleeve 400 is further formed with a fluid passage hole 420 communicating with the groove 410. The fluid passage hole 420 can be fluidly connected to a cleaning line in the catheter 50, so that the cleaning fluid can enter 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 play a lubricating role, reducing the friction between the ball head portion 310 and the groove wall of the groove 410, and reducing the wear of the ball head portion 310 and the first shaft sleeve 400.

[0037] Specifically, one opening 421 of the liquid passage hole 420 is located at the center position of the spherical groove wall 412, so that the cleaning liquid that has entered the recessed groove 410 from the liquid passage hole 420 provides as much axial impact force as possible to the ball head portion 310. More specifically, the central axis of the liquid passage hole 420 overlaps with the central axis of the chamber surrounded by the spherical groove wall 412, making the liquid passage hole 420 a straight hole and reducing the energy consumption of the cleaning liquid in the liquid passage hole 420.

[0038] Specifically, the diameter of the opening 421 located in the spherical groove wall 412 of the liquid passage hole 420 is 1 / 9 to 1 / 3 of the diameter of the sphere on which the ball head portion 310 is located. In the illustrated embodiment, the diameter of the liquid passage hole 420 is constant, that is, the diameter of the liquid passage hole 420 is 1 / 9 to 1 / 3 of the diameter of the sphere on which the ball head portion 310 is located. If the diameter of the opening 421 located in the spherical groove wall 412 of the liquid passage hole 420 is too large, the contact surface between the ball head portion 310 and the spherical groove wall 412 becomes small (the pressure received per unit area becomes large), and the wear of the ball head portion 310 by the spherical groove wall 412 increases. If the diameter of opening 421 is too small, it will affect the amount of cleaning liquid that enters groove 410 from liquid passage hole 420. The cleaning liquid that enters groove 410 will apply an impact force to ball head portion 310, and at the same time, will enter between ball head portion 310 and spherical groove wall 412 to perform a lubricating effect and reduce the friction coefficient between ball head portion 310 and spherical groove wall 412, so it is not preferable for the amount of cleaning liquid that enters groove 410 to be too small.

[0039] 2, 4 and 10, specifically, the driving device 10 further includes a fixed seat 810 fixedly connected to the housing 100. The fixed seat 810 is formed with a mounting chamber 811 and a liquid inlet hole 812 communicating with the mounting chamber 811, and the first shaft sleeve 400 is attached to the mounting chamber 811. The liquid passage hole 420 communicates with the liquid inlet hole 812. One end of the liquid inlet hole 812 away from the mounting chamber 811 communicates with the cleaning line of the catheter 50, so that the cleaning liquid can flow between the groove wall of the groove 410 and the ball head portion 310 through the liquid inlet hole 812 and the liquid passage hole 420, and then flow into the chamber of the housing 100.

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

[0041] Specifically, the fixed seat 810 is further formed with a branch passage 813, which is fluidly connected to the liquid inlet hole 812, so that the fluid (e.g., cleaning liquid) flowing through the liquid inlet hole 812 can further flow into the housing 100 through the branch passage 813. Specifically, one end of the branch passage 813 is connected to the gap between the first shaft sleeve 400 and the chamber bottom 8111 of the mounting chamber 811, and the other end is connected to the accommodation chamber 103. In the illustrated embodiment, the branch passage 813 is formed by recessing a part of the chamber wall of the mounting chamber 811. In other words, under normal conditions, the cleaning liquid enters the mounting chamber 811 from the liquid inlet hole 812 and then branches into two, one of which flows into the recessed groove 410 of the first shaft sleeve 400 through the liquid passage hole 420, and the other flows out through the branch passage 813. By providing the branch flow path 813, it is possible to ensure the flow of the cleaning liquid even when the ball head portion 310 blocks the liquid passage hole 420.

[0042] In the illustrated embodiment, the number of branch channels 813 is two, and the two branch channels 813 are provided opposite to each other. Note that the number of branch channels 813 can be adjusted according to design needs, and for example, in some embodiments, the number of branch channels 813 may be one or more than two.

[0043] 2 and 11, the second shaft sleeve 500 abuts against the partition ring 110. In the illustrated embodiment, the second shaft sleeve 500 is accommodated in the position limiting chamber 102, and the partition ring 110 positions the second shaft sleeve 500, making it easy to assemble the second shaft sleeve 500. The second shaft sleeve 500 has a shaft hole 510 formed therein, and the rotating shaft 200 is rotatably inserted through the shaft hole 510. In the illustrated embodiment, the central axis of the shaft hole 510 overlaps with the central axis of the fluid passage hole 420 of the first shaft sleeve 400. Between the hole wall of the shaft hole 510 of the second shaft sleeve 500 and the rotating shaft 200, there is a gap through which a fluid can flow. The cleaning liquid that has entered the accommodation 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, 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, thereby limiting the range of movement of the rotating shaft 200 along the axis of the rotating shaft 200 in a direction proximate to the second shaft sleeve 500. In the illustrated embodiment, the stator 700 is located between the first rotor 300 and the position limiting member 600.

[0045] 2, 3 and 11, the position limiting member 600 includes a thrust ring 610 and a second rotor 620, 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. In other words, the thrust ring 610 may be directly fixed only to the second rotor 620, may be directly fixed only to the rotating shaft 200, or may be directly fixed simultaneously to both the second rotor 620 and the rotating shaft 200. Since 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 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 to limit the range of movement of the rotating shaft 200 along its axial direction in a direction approaching the impeller 20.

[0046] In addition, 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 a groove 410 of the first shaft sleeve 400 and can abut against a spherical groove wall 412 of the groove 410, thereby limiting the range in which the rotating shaft 200 moves along the axis of the rotating shaft 200 in a direction away from the impeller 20, thereby realizing a positional restriction on the axis of the rotating shaft 200 relative to the rotating shaft 200. In addition, 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, so that 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 realizing an overall restriction on the swing range of the rotating shaft 200 in the radial direction. In other words, the above design not only provides axial positional limits relative to the rotating shaft 200, but also radial positional limits relative to the rotating shaft 200.

[0047] The second rotor 620 is accommodated in the accommodation 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 shaking of the rotating shaft 200 during rotation can also be reduced, and thus the entire rotating shaft 200 becomes 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 portion 6211, a second built-in tube 6212, and a second external tube 6213, and both the second built-in tube 6212 and the second external tube 6213 have a circular tubular structure, and the second disk portion 6211 has an annular disk structure. The second built-in tube 6212 and the second external tube 6213 are both fixedly connected to the second disk portion 6211. The second external tube 6213 is provided so as to surround the second disk portion 6211, and both the second built-in tube 6212 and the second external tube 6213 are provided coaxially, and the rotating shaft 200 is provided penetrating the second built-in tube 6212 and fixedly connected to the second built-in tube 6212. A second annular chamber is formed between the second built-in tube 6212 and the second external tube 6213. The second magnet 622 is accommodated in the second annular chamber. The shape of the second annular chamber is adapted to the second magnet 622 so as to facilitate the installation and positioning of the second magnet 622. In this way, the second flywheel 621 can play a position limiting role on the second magnet 622, which not only facilitates the installation of the second magnet 622 but also makes 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, and in some embodiments, the second flywheel 621 does not have the second external pipe 6213, and in some embodiments, the second flywheel 621 does not have the second built-in pipe 6212 and the second external pipe 6213, and in this case, the rotating shaft 200 is fixedly provided to penetrate through the center of the second disk portion 6211. By providing the second built-in pipe 6212 to the second flywheel 621 having only the second disk 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 protrusion 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 disk portion 6211 away from the second internal tube 6212. That is, the thrust ring 610 and the second flywheel 621 are an integrally molded structure and are integrally formed, and since the overall volume of the blood pump 1 is small, the volume of the thrust ring 610 is smaller, the processing accuracy is difficult, and the assembly is difficult, if the thrust ring 610 and the second flywheel 621 are integrally molded, it is easy to install and the adhesive operation is omitted.

[0052] In other embodiments, the thrust ring 610 and the second rotor 620 may be separate structures before assembly, and 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 abuts against the second shaft sleeve 500, at least a part of the thrust ring 610 is located in the inner ring of the partition ring 110, there is a gap between the thrust ring 610 and the inner ring wall of the partition ring 110 through which a fluid flows, and there is a certain distance between the partition ring 110 and the second rotor 620. By having a gap between the thrust ring 610 and the inner ring wall of the partition ring 110 through which a fluid flows, the cleaning liquid can flow into the axial hole 510 of the second shaft sleeve 500 through the gap between the thrust ring 610 and the inner ring wall of the partition ring 110, that is, the fluid communication between the axial hole 510 of the second shaft sleeve 500 and the receiving chamber 103 is realized. When the thrust ring 610 abuts against the second shaft sleeve 500, the partition ring 110 and the second rotor 620 are spaced apart by a certain distance, thereby preventing the second rotor 620 and the partition ring 110 from coming into contact with each other and causing friction and wear when the thrust ring 610 abuts against the second shaft sleeve 500.

[0054] Specifically, the thrust ring 610 is substantially annular, and the central axis of the thrust ring 610 overlaps 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 providing a gap through which a fluid can flow between the thrust ring 610 and the inner ring wall of the partition ring 110. In another embodiment, the thrust ring 610 may be formed by an arrangement of a plurality of sector rings, the plurality of sector rings being provided around the rotating shaft 200 at equal intervals, or the thrust ring 610 may be formed by an arrangement of a plurality of sector rings being provided 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 there is a certain distance between the partition ring 110 and the second rotor 620 when the thrust ring 610 abuts against the second shaft sleeve 500. Note that in some embodiments, 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, and in this case, the second rotor 620 and the thrust ring 610 may be spaced apart by a certain distance in the direction along the axis of the rotating shaft 200, which distance can separate the partition ring 110 and the second rotor 620 by a certain distance when the thrust ring 610 abuts against the second shaft sleeve 500.

[0056] Specifically, referring to FIG. 12, a portion of the surface of the second shaft sleeve 500 facing the thrust ring 610 is recessed to form a guide groove 530, which is connected to the axial hole 510 of the second shaft sleeve 500. When the thrust ring 610 abuts against the second shaft sleeve 500, a portion of the guide groove 530 is not covered by the thrust ring 610. When the thrust ring 610 abuts against the second shaft sleeve 500, the thrust ring 610 blocks the gap between the axial hole 510 of the second shaft sleeve 500 and the rotating shaft 200. However, the guide groove 530 that is not covered by the thrust ring 610 realizes fluid communication when the thrust ring 610 abuts against the second shaft sleeve 500, thereby ensuring the smooth flow of the cleaning liquid. In addition, a portion of the surface of the second shaft sleeve 500 facing the thrust ring 610 is recessed to form a guide groove 530, which allows the cleaning liquid to flow more efficiently between the thrust ring 610 and the second shaft sleeve 500, thereby providing a lubricating effect on 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 a heat dissipation effect for the thrust ring 610 and the second shaft sleeve 500.

[0057] Specifically, the thrust ring 610 has a stopper surface 611 that is perpendicular to the axis of the rotating shaft 200, the second shaft sleeve 500 has a locking surface 520 that 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 to restrict movement of the rotating shaft 200 along the axis of the rotating shaft 200 in a direction approaching the impeller 20. Since the stopper surface 611 is perpendicular to the axis of the rotating shaft 200, 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 inserted through the shaft hole 510 of the second shaft sleeve 500, when the rotating shaft 200 operates normally and the thrust ring 610 abuts against the second shaft sleeve 500, the stopper surface 611 and the locking surface 520 can come into surface contact with each other, thereby reducing wear due to friction between the thrust ring 610 and the second shaft sleeve 500. Specifically, the locking surface 520 abuts against 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 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 friction force between the stopper surface 611 and the locking surface 520 can be effectively reduced, and the wear problem caused by friction between the second shaft sleeve 500 and the thrust ring 610 can be reduced.

[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 precision, high biocompatibility, high mechanical strength, and good wear resistance and corrosion resistance. At this time, 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 is realized as a ceramic surface by providing a ceramic coating. In some embodiments, the material of the stopper surface 611 is diamond, so that the stopper surface 611 has high hardness, a smooth surface, and is not easily worn, and at this time, the material of the stopper surface 611 is realized as a ceramic surface by providing a diamond coating.

[0060] 2 and 13, the stator 700 includes a first stator unit 710 and a second stator unit 720 provided along the axis of the rotating shaft 200, and the first stator unit 710 can drive the first rotor 300 to rotate, and the second stator unit 720 can drive the second rotor 620 to rotate. Specifically, the first stator unit 710 can generate a rotating magnetic field that drives the first rotor 300 to rotate, and the second stator unit 720 can generate 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 accommodated in the accommodating chamber 103 of the housing 100. The rotating shaft 200 is provided to rotatably penetrate the first stator unit 710 and the second stator unit 720. The first stator unit 710 and the second stator unit 720 are all 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, the first rotor 300 is provided close to the first shaft sleeve 400, and the second rotor 620 is provided 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 provided in order along the axis of the rotating shaft 200, and the second shaft sleeve 500 is closest to the connection end 210 of the rotating shaft 200.

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

[0062] 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, and the second coil 722 is wound around the second magnetic core 721. There are a plurality of second magnetic cores 721, and the plurality of second magnetic cores 721 are provided around the axis of the rotating shaft 200. Each second magnetic core 721 is provided with one second coil 722.

[0063] Specifically, the driving device 10 further includes a magnetically 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 magnetically permeable member 820. Specifically, the magnetically permeable member 820 is fixedly accommodated in the housing 100, and is engaged with, for example, an inner wall of the housing 100. The rotating shaft 200 is provided rotatably penetrating the magnetically permeable member 820. One end of the first magnetic core 711 is fixedly connected to the magnetically permeable member 820, the first rotor 300 is provided adjacent to the other end of the first magnetic core 711, one end of the second magnetic core 721 is fixedly connected to the magnetically permeable member 820, and the second rotor 620 is provided adjacent to the other end of the second magnetic core 721.

[0064] The magnetic permeable member 820 plays a role in closing the magnetic path, promoting and increasing the generation of magnetic flux, and improving the coupling ability. Therefore, by providing the magnetic permeable member 820, the magnetic path between the first stator unit 710 and the first rotor 300 and between the second stator unit 720 and the second rotor 620 can be closed, increasing the magnetic flux, and is advantageous in reducing the overall diameter of the drive device 10. In addition, by fixedly 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 magnetic permeable member 820, the positioning and mounting of the first stator unit 710 and the second stator unit 720 can be realized, and the difficulty of assembling the first stator unit 710 and the second stator unit 720 can be reduced. At the same time, the magnetic permeable member 820 provided as above can also reduce the installation of a positioning structure in the housing 100, simplifying the structure of the housing 100 and simplifying the assembly process of the entire drive device 10.

[0065] Specifically, the magnetic permeable member 820 includes two magnetic permeable plates 821, the two magnetic permeable plates 821 are stacked, one magnetic permeable plate 821 is fixedly connected to the first magnetic core 711 of the first stator unit 710, the other magnetic 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 to rotatably penetrate the two magnetic permeable plates 821. Specifically, the two magnetic permeable plates 821 are separate before assembly, and by providing the magnetic permeable member 820 as two separate magnetic permeable plates 821 before assembly, when assembling the drive device 10, first the first magnetic core 711 is fixedly connected to the magnetic permeable plate 821, the second magnetic core 721 is fixedly connected to another magnetic permeable plate 821, and then the two magnetic permeable plates 821 are stacked. In this way, it is convenient to assemble the first magnetic core 711 and the second magnetic core 721 to the two magnetic permeable plates 821 respectively, and the assembly of the first magnetic core 711 and the second magnetic core 721 is more convenient.

[0066] Specifically, by fixedly connecting the two magnetically permeable plates 821, the first stator unit 710, the second stator unit 720, and the magnetically permeable member 820 are integrated and assembled in the housing 100, making it easier to assemble the stator 700. For example, the two magnetically permeable plates 821 may be connected by adhesion or welding. Note that in other embodiments, the two magnetically permeable plates 821 are not fixedly connected and are in contact with each other.

[0067] In addition, the magnetic permeable member 820 is not limited to a system formed by combining the above-mentioned two separate magnetic permeable plates 821, and the magnetic permeable member 820 may have a plate-shaped structure, and the first magnetic core 711 and the second magnetic core 721 are both connected to the magnetic permeable member 820, that is, the first stator unit 710 and the second stator unit 720 share one magnetic permeable member 820.

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

[0069] Both the first magnetic core 711 and the second magnetic core 721 have a columnar structure and do not have a wide head (i.e., a pole piece). Compared with a magnetic core provided with a pole piece, the magnetic core with a columnar structure can reduce magnetic loss and increase the magnetic coupling density between the magnetic core and the magnet, thereby increasing the torque (under the same current conditions) for the magnet of the stator 700. In addition, the magnetic core without a head can significantly reduce the problem of local magnetic short circuit and reduction in motor power caused by contact between adjacent magnetic cores.

[0070] However, the structure of the driving device 10 is not limited to the above structure. In some embodiments, the driving device 10 includes the first rotor 300, the second rotor 620, and the stator 700, but the stator 700 only has one stator unit, that is, only has the first stator unit 710 and does not have the second stator unit 720, in which 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] Note that the position limiting member 600 is not limited to the above structure. In some embodiments, the position limiting member 600 is only the thrust ring 610 and does not include the second rotor 620, and in this 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 to limit the range of movement of the rotating shaft 200 along its axis in a direction approaching the second shaft sleeve 500. In some embodiments, the position limiting member 600 is only the second rotor 620 and does not have a thrust ring 610, in which case the second rotor 620 is fixedly connected to the rotating shaft 200, the stator 700 is located between the first rotor 300 and the second rotor 620, and the side of the second rotor 620 away from the stator 700 abuts against the second shaft sleeve 500 or the partition ring 110 to limit the range of movement of the rotating shaft 200 along its axis in a direction approaching the impeller 20.

[0072] Since the drive device of this embodiment has a similar structure to that of the first embodiment, the drive device of this embodiment and the blood pump including the same also achieve the same effects as those of the first embodiment.

[0073] The above embodiments are only for illustrating the technical solutions of the present invention, and are not intended to be limiting. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art may modify the technical solutions described in the above embodiments or make equivalent replacements for some of the technical features thereof, and such modifications and replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and all of them should be included in the protection scope of the present invention.

Claims

1. Housing and a rotating shaft configured to be connected to an impeller and rotatably mounted to the housing; a first rotor fixedly connected to one end of the rotating shaft and having a ball head portion protruding along an axis of the rotating shaft; a first shaft sleeve attached to the housing, the first shaft sleeve having a groove with a concave spherical groove wall formed therein, the ball head portion being movably disposed within the groove and capable of abutting against the spherical groove wall; a second shaft sleeve attached to the housing, the rotating shaft rotatably penetrating the second shaft sleeve, and the first rotor is a second shaft sleeve located between the first shaft sleeve and the second shaft sleeve; a position limiting member fixedly connected to the rotating shaft, positioned between the second shaft sleeve and the first rotor, and capable of abutting against the second shaft sleeve.

2. 2. The drive device according to claim 1, wherein 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.

3. 3. The driving device according to claim 2, wherein the first flywheel includes a first disk portion, a first internal tube, and a first external tube, one ends of the first internal tube and the first external tube are both fixedly connected to the first disk portion, the first internal tube and the first external tube are located on the same side of the first disk portion and are arranged 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 accommodated in the first external tube, a first annular chamber that accommodates the first magnet is formed between the first external tube and the first internal tube, the rotating shaft has a connection end configured to be connected to the impeller, one end of the rotating shaft away from the connection end is fixedly accommodated in the first internal tube, and the ball head portion is located on the side of the first disk portion away from the first internal tube.

4. 2. 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 a fluid inlet hole communicating with the mounting chamber, the first shaft sleeve is attached to the mounting chamber, and the fluid passage hole is fluidly connected to the fluid inlet hole.

5. the mounting chamber has a chamber bottom, an opening of the liquid inlet hole is located at the chamber bottom, a support step portion is provided within the mounting chamber, the support step portion abuts against the first shaft sleeve to separate the first shaft sleeve from the chamber bottom by a certain distance, and / or a branch flow passage is further formed in the fixed seat, and the branch flow passage is connected to the liquid inlet hole, so that the fluid that has entered the liquid inlet hole can further flow into the housing via the branch flow passage; And / or, the opening of the fluid passage hole is located in the spherical groove wall, the opening is located at a center position 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.

6. 5. The drive unit according to claim 4, wherein the groove opening of the groove is rounded and the ball head portion is provided with a diamond coating.

7. 2. The drive device of claim 1, wherein the first rotor further includes a rotor body and a connecting post having one end fixedly connected to the rotor body, the rotor body being fixedly connected to the rotating shaft, the ball head portion being formed at one end of the connecting post away from the rotor body, the length of the ball head portion in the axial direction of the rotating shaft being smaller than the depth of the groove, and a portion of the connecting post being accommodated in the groove.

8. 8. The drive device according to claim 7, wherein the ball head portion is hemispherically shaped, the ball head portion has a spherical crown surface and a circular bottom surface connected to the spherical crown surface, the circular bottom surface is connected to an end surface of the connection post portion, the connection post portion is coaxial with the ball head portion, and a diameter of an end surface of one end of the connection post portion adjacent to the ball head portion is equal to a diameter of the circular bottom surface.

9. 2. 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 abutting against the second shaft sleeve.

10. 10. The drive device of claim 9, wherein 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 rotation of the second magnet, and the thrust ring is an annular protrusion formed on a side of the second flywheel away from the stator.

11. a partition ring is provided within the housing, the partition ring dividing a chamber of the housing into a position limiting chamber and an accommodating chamber, the partition ring being located between the second shaft sleeve and the second rotor, the second shaft sleeve being accommodated within the position limiting chamber and abutting the partition ring, and the second rotor being accommodated within the accommodating chamber; 10. The drive device according to claim 9, wherein when the thrust ring abuts against the second shaft sleeve, at least a portion of the thrust ring is located on an inner ring of the partition ring, there is a gap between the thrust ring and the inner ring wall of the partition ring through which a fluid can flow, and there is a certain distance between the partition ring and the second rotor.

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

13. 10. The drive device of claim 9, wherein the thrust ring has a stopper surface, the stopper surface being perpendicular to an axis of the rotating shaft, the second shaft sleeve has an engagement surface, the engagement surface facing the stopper surface, the engagement surface abutting against the stopper surface, the engagement surface being provided with a guide groove, the guide groove communicating with an axial hole of the second shaft sleeve to allow a cleaning liquid to flow, and when the engagement surface abuts against the stopper surface, a portion of the guide groove is not covered by the thrust ring.

14. 14. The drive device according to claim 13, wherein at least one of the stopper surface and the engagement surface has a roughness of 0.1 micrometers or less, or at least one of the stopper surface and the engagement surface is a ceramic surface.

15. 10. The drive device according to claim 9, wherein the thrust ring is annular, and a central axis of the thrust ring overlaps with an axis of the rotating shaft, or the thrust ring is formed by an array of a plurality of sector rings, and the plurality of sector rings are arranged around the rotating shaft at equal intervals.

16. 11. The drive device according to claim 10, wherein the thrust ring is integrally formed with a 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.

17. 10. The drive device according to claim 9, further comprising a stator, the stator including a first stator unit and a second stator unit arranged along an axis of the rotating shaft, the first stator unit and the second stator unit both being located between the first rotor and the second rotor, the first stator unit being capable of driving the rotation of the first rotor, and the second stator unit being capable of driving the rotation of the second rotor.

18. 18. The drive device of claim 17, wherein the first stator unit includes a first magnetic core and the 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 magnetically permeable member fixedly connected to the housing, the magnetically permeable member being fixedly connected to both the first magnetic core and the second magnetic core.

19. The driving device described in claim 18, characterized in that the magnetic permeable member includes two magnetic permeable plates, the two magnetic permeable plates being stacked, one of the magnetic permeable plates being fixedly connected to the first magnetic core, and the other of the magnetic permeable plates being fixedly connected to the second magnetic core.

20. A blood pump including an impeller and a drive mechanism, The drive device is Housing and a rotating shaft configured to be connected to an impeller and rotatably mounted to the housing; a first rotor fixedly connected to one end of the rotating shaft and having a ball head portion protruding along an axis of the rotating shaft; a first shaft sleeve attached to the housing, the first shaft sleeve having a groove with a concave spherical groove wall formed therein, the ball head portion being movably disposed within the groove and capable of abutting against the spherical groove wall; a second shaft sleeve attached to the housing, the rotating shaft rotatably penetrating the second shaft sleeve, and the first rotor is a second shaft sleeve located between the first shaft sleeve and the second shaft sleeve; a position limiting member that is fixedly connected to the rotating shaft, that is located between the second shaft sleeve and the first rotor, and that is capable of abutting against the second shaft sleeve; A blood pump, characterized in that the rotating shaft is connected to the impeller and is capable of driving the rotation of the impeller.

Images