Drive device and blood pump

Abstract

A drive device and a blood pump are disclosed. The housing assembly (100) of the drive device (10) has a through hole (101). The rotating shaft (200) has a shaft portion (210) and a ball head (220) fixedly connected to one end of the shaft portion (210). One end of the shaft portion (210) away from the ball head (220) is rotatably provided through the through hole (101). The first shaft sleeve (500) is attached to the housing assembly (100). The first shaft sleeve (500) has a receiving cavity (501) and a shaft hole (502). The receiving cavity (501) is adapted to the ball head. The shaft hole (502) communicates with the receiving cavity (501). The ball head is rotatably provided in the receiving cavity. The shaft portion is rotatably provided through the shaft hole. The aperture diameter of the shaft hole is smaller than the diameter of the ball head so as to limit the ball head within the receiving cavity.

Description

Technical Field

[0001] This application claims the priority of the Chinese patent application with the application number 202210887639.0 filed with the China National Intellectual Property Administration on July 26, 2022, and all of its content is incorporated herein by reference.

[0002] This application relates to the technical field of medical devices, and particularly to a driving device and a blood pump.

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 generally includes a driving device and an impeller. The impeller is connected to the rotating shaft of the driving device. To achieve stable rotation of the rotating shaft and ensure that the rotating shaft rotates with low friction, it is usually necessary to add a member for restricting the position of the rotating shaft. However, there are many current members for position restriction, which makes the structure of the driving device complex and assembly difficult.

Summary of the Invention

Problems to be Solved by the Invention

[0005] Based on this, this application provides a driving device and a blood pump with low assembly difficulty.

Means for Solving the Problems

[0006] According to a first aspect, this application provides a housing assembly having a through hole, a rotating shaft having a shaft portion and a ball head fixedly connected to one end of the shaft portion, wherein one end of the shaft portion away from the ball head is rotatably penetrated through the through hole. A first shaft sleeve attached to the housing assembly and having a receiving cavity and a shaft hole, wherein the receiving cavity is adapted to the ball head, the shaft hole communicates with the receiving cavity, the ball head is rotatably provided in the receiving cavity, the shaft portion is rotatably penetrated through the shaft hole, and the aperture diameter of the shaft hole is smaller than the diameter of the ball head so as to limit the ball head within the receiving cavity, and a driving device including the first shaft sleeve is provided.

[0007] According to a second aspect, the present application provides a blood pump including an impeller and the driving device. The driving device A housing assembly having a through hole, A rotating shaft having a shaft portion and a ball head fixedly connected to one end of the shaft portion, wherein one end of the shaft portion away from the ball head is rotatably penetrated through the through hole, A first shaft sleeve attached to the housing assembly and having a receiving cavity and a shaft hole, wherein the receiving cavity is adapted to the ball head, the shaft hole communicates with the receiving cavity, the ball head is rotatably provided in the receiving cavity, the shaft portion is rotatably penetrated through the shaft hole, the aperture diameter of the shaft hole is smaller than the diameter of the ball head so as to limit the ball head within the receiving cavity, and one end of the shaft portion away from the ball head is connected to the impeller, and the driving device includes the first shaft sleeve.

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

Brief Description of the Drawings

[0009] The following briefly describes the drawings that are necessary for explaining the technical means in the embodiments of the present application in a clearer manner or for the description of the embodiments or the prior art. As is obvious, 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 creative labor.

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Modes for Carrying Out the Invention

[0010] Hereinafter, to more clearly understand the object, technical solution and advantages of the present application, the present application will be described in more detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for the purpose of interpreting the present application and do not limit the present application.

[0011] In addition, when an element is referred to as being "fixed to" or "provided 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.

[0012] Also, the terms "first" and "second" are for illustrative 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 the said features. In the description of the present application, "a plurality" means two or more unless otherwise specified.

[0013] 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.

[0014] The blood pump 1 and the driving device 10 in the embodiments of the present invention will be described.

[0015] As shown in FIGS. 1 to 3, the blood pump 1 includes a driving device 10 and an impeller 20. The driving device 10 is transmission-connected to the impeller 20, and the driving device 10 can drive the impeller 20 to rotate.

[0016] Specifically, the blood pump 1 further includes a cannula 30 fixedly connected to the distal end of the drive device 10. The impeller 20 is rotatably accommodated in the cannula 30. The cannula 30 has a blood inlet 31 and a blood outlet 32. When the impeller 20 rotates, blood flows into the cannula 30 from the blood inlet 31 and then flows out from the blood outlet 32. In one embodiment, the cannula 30 penetrates a heart valve, for example, the aortic valve, the blood inlet 31 is located inside the heart, and the blood outlet 32 and the drive device 10 are located in a blood vessel such as the aorta outside the heart.

[0017] Specifically, the blood pump 1 further includes a catheter 40 connected to the proximal end of the drive device 10. The catheter 40 accommodates various supply lines. For example, the supply lines include a conducting wire for electrically connecting the drive device 10 and a cleaning line for passing a cleaning liquid through the drive device 10 of the blood pump 1. Preferably, the cleaning liquid is physiological saline, heparin-containing physiological saline, glucose, or the like.

[0018] The drive device 10 includes a housing assembly 100, a rotating shaft 200, a rotor 300, a stator 400, and a first shaft sleeve 500.

[0019] The housing assembly 100 has its distal end fixedly connected to the cannula 30 and its proximal end fixedly connected to the catheter 40. One end of the housing assembly 100 has a through hole 101, and the through hole 101 is located at one end of the housing assembly 100 close to the cannula 30. The housing assembly 100 further has a cavity 102. The cavity 102 communicates with the through hole 101. The cleaning liquid in the cleaning line can flow into the cavity 102 and flow out of the housing assembly 100 through the through hole 101.

[0020] Specifically, the housing assembly 100 includes an outer housing 110 and a second shaft sleeve 120.

[0021] The outer housing 110 is a generally cylindrical housing with both ends open. The outer housing 110 has its distal end fixedly connected to the cannula 30 and its proximal end fixedly connected to the catheter 40. The outer housing 110 has the cavity 102. In some embodiments, the outer housing 110 is formed by joining two substantially symmetrical half-housings such that components like the rotor 300 and stator 400 are attached to the cavity 102 of the outer housing 110.

[0022] The second shaft sleeve 120 is fixedly connected within the outer housing 110, and the through-hole 101 is formed in the second shaft sleeve 120. The second shaft sleeve 120 is provided at the opening of one end of the outer housing 110 close to the cannula 30.

[0023] The rotating shaft 200 is rotatably attached to the housing assembly 100. The rotating shaft 200 is fixedly connected to the impeller 20, and the rotating shaft 200 can drive the impeller 20 to rotate. The rotating shaft 200 has a shaft portion 210 and a ball head 220 fixedly connected to one end of the shaft portion 210. One end of the shaft portion 210 away from the ball head 220 is rotatably penetrated through the through-hole 101. One end of the shaft portion 210 away from the ball head 220 is fixedly connected to the impeller 20.

[0024] The shaft portion 210 is elongate. The shaft portion 210 has a connection end 211 for connecting to the impeller 20, that is, the connection end 211 is one end of the shaft portion 210 away from the ball head 220. A part of the shaft portion 210 is located within the outer housing 110, and a part is located outside the outer housing 110 or within the cannula 30. The connection end 211 extends to the outside of the outer housing 110 and is fixedly connected to the impeller 20. In the illustrated embodiment, the shaft portion 210 extends generally along the axial direction of the outer housing 110, or the extending direction of the axis of the shaft portion 210 is generally coincident with the axial direction of the outer housing 110.

[0025] The ball head 220 is substantially spherical. The ball head 220 is fixedly connected to one end of the connecting end 211 of the shaft portion 210 away from the shaft portion 210. Specifically, the axis of the shaft portion 210 passes through the center of the ball of the ball head 220. In the illustrated embodiment, the diameter of the ball head 220 is larger than the diameter of the shaft portion 210.

[0026] In some embodiments, the shaft portion 210 and the ball head 220 are made of a ceramic material. Compared with a metal material, ceramics have high machining accuracy, high biocompatibility, high mechanical strength, and good wear resistance and corrosion resistance. In some embodiments, the shaft portion 210 and the ball head 220 have an integrally formed structure. In some embodiments, the shaft portion 210 and the ball head 220 may be fixedly connected together integrally by assembly, welding, or adhesion. In some embodiments, the ball head 220 has a ball body and a diamond coating provided on the surface of the ball body, which smooths the surface of the ball head 220 and has high wear resistance. At this time, the material of the ball body may be a material having a certain rigidity, such as metal, ceramics, etc., and the material of the ball body may be the same as the material of the shaft portion 210.

[0027] As shown in FIGS. 3 and 4, the rotor 300 is fixedly connected to the shaft portion 210. Specifically, the rotor 300 includes a flywheel 310 and a magnet 320. The flywheel 310 is fixedly connected to the shaft portion 210, and the magnet 320 is fixedly connected to the flywheel 310. In some embodiments, the magnet 320 is an annular Halbach array magnet. In the illustrated embodiment, the rotor 300 is located in the cavity 102, and the rotor 300 is located between the through hole 101 and the first shaft sleeve 500, that is, the rotor 300 is located between the second shaft sleeve 120 and the first shaft sleeve 500. The rotor 300 is rotatable relative to the housing assembly 100 and can drive the rotating shaft 200 to rotate.

[0028] As shown in FIG. 5, the flywheel 310 includes a disk-shaped portion 311, a built-in pipe 312, and an external pipe 313. Both the built-in pipe 312 and the external pipe 313 have a circular tubular structure, and the disk-shaped portion 311 has an annular disk structure. One end of each of the built-in pipe 312 and the external pipe 313 is fixedly connected to the disk-shaped portion 311. The built-in pipe 312 and the external pipe 313 are located on the same side of the disk-shaped portion 311 and are provided coaxially. The inner diameter of the external pipe 313 is larger than the outer diameter of the built-in pipe 312. At least a part of the built-in pipe 312 is accommodated in the external pipe 313, and an annular cavity 314 for accommodating the magnet 320 is formed between the external pipe 313 and the built-in pipe 312. The shape of the annular cavity 314 is adapted to the shape of the magnet 320 in order to facilitate the attachment and positioning of the magnet 320. In this way, the flywheel 310 can exert a position-limiting effect on the magnet 320, not only facilitating the attachment of the magnet 320, but also making the connection between the magnet 320 and the flywheel 310 more stable.

[0029] Note that the flywheel 310 is not limited to the above structure. In some embodiments, the flywheel 310 does not have the external pipe 313. In some embodiments, the flywheel 310 does not have the external pipe 313 and the built-in pipe 312. At this time, the shaft portion 210 is fixedly provided through the center of the disk-shaped portion 311. By providing the built-in pipe 312 for the flywheel 310 having only the disk-shaped portion 311, the flywheel 310 and the shaft portion 210 can be more stably connected. The shaft portion 210 may be fixedly connected to the disk-shaped portion 311 in various ways such as welding or adhesion. The shaft portion 210 may be fixedly connected while being held so as to be relatively stationary with respect to the disk-shaped portion 311 by a position-limiting structure. The shaft portion 210 may be fixedly connected by rotating synchronously with the flywheel 310 due to the presence of a flat surface on the contact surface with the built-in pipe 312. Note that in some embodiments, the flywheel 310 may be omitted. In this case, the magnet 320 may be directly fixed to the shaft portion 210.

[0030] As shown in FIGS. 3 and 6, the stator 400 and the rotor 300 are provided along the axis of the shaft portion 210. The stator 400 is located between the through hole 101 and the first shaft sleeve 500, that is, the stator 400 is located between the first shaft sleeve 500 and the second shaft sleeve 120. The stator 400 can drive the rotor 300 to rotate. Specifically, the stator 400 can generate a rotating magnetic field that drives the magnet 320 to rotate. By providing the rotor 300 and the stator 400 along the axis of the shaft portion 210, the diameter of the entire drive device 10 can be reduced. In the illustrated embodiment, the stator 400 is fixedly attached to the housing assembly 100. Specifically, the stator 400 is located in the cavity 102, and the shaft portion 210 is rotatably provided through the stator 400.

[0031] In the illustrated embodiment, the rotor 300 includes a first rotor unit 301 and a second rotor unit 302 provided along the axis of the shaft portion 210. Specifically, there are two flywheels 310, and correspondingly, there are two magnets 320. One of the flywheels 310 and one of the magnets 320 jointly constitute the first rotor unit 301, and the other flywheel 310 and the other magnet 320 jointly constitute the second rotor unit 302. The first rotor unit 301 and the second rotor unit 302 are provided opposite to each other. The stator 400 is located between the first rotor unit 301 and the second rotor unit 302. The stator 400 includes a first stator unit 401 and a second stator unit 402 provided along the axis of the shaft portion 210. The first stator unit 401 can drive the first rotor unit 301 to rotate, and the second stator unit 402 can drive the second rotor unit 302 to rotate. Specifically, the first stator unit 401 can generate a rotating magnetic field for driving the first rotor unit 301 to rotate, and the second stator unit 402 can generate a rotating magnetic field for driving the second rotor unit 302 to rotate. Both the first stator unit 401 and the second stator unit 402 are fixedly accommodated in the cavity 102 of the housing assembly 100. The shaft portion 210 is rotatably provided through the first stator unit 401 and the second stator unit 402. Both the first stator unit 401 and the second stator unit 402 are located between the first rotor unit 301 and the second rotor unit 302. In the illustrated embodiment, the first rotor unit 301, the first stator unit 401, the second stator unit 402, and the second rotor unit 302 are provided in order along the axial direction.

[0032] Specifically, both the first stator unit 401 and the second stator unit 402 include a magnetic core 410 and a coil 420, and the coil 420 is wound around the magnetic core 410. The magnetic core 410 has a substantially columnar structure, that is, the magnetic core 410 has no wide head (i.e., pole piece). Compared with a magnetic core provided with a pole piece, the columnar magnetic core 410 can reduce magnetic loss, increase the magnetic coupling density between the magnetic core 410 and the magnet 320, and increase the torque (under the same current condition) of the stator 400 with respect to the magnet 320. In addition, the magnetic core 410 without a head can significantly reduce problems such as local magnetic short - circuit due to contact between adjacent magnetic cores 410 and reduction of motor power.

[0033] Specifically, the extending direction of the magnetic core 410 coincides with the axial direction of the external housing 110 or the axial direction of the shaft portion 210. There are a plurality of magnetic cores 410 in the first stator unit 401 and the second stator unit 402, and the plurality of magnetic cores 410 in the first stator unit 401 and the second stator unit 402 are respectively provided so as to go around the axis of the shaft portion 210. One coil 420 is provided corresponding to each magnetic core 410.

[0034] Specifically, the driving device 10 further includes a magnetic permeable member 600 fixedly connected to the housing assembly 100. The magnetic cores 410 of the first stator unit 401 and the magnetic cores 410 of the second stator unit 402 are both fixedly connected to the magnetic permeable member 600. In some embodiments, the magnetic permeable member 600 is engaged with the inner wall of the outer housing 110. The shaft portion 210 is rotatably provided through the magnetic permeable member 600. The magnetic permeable member 600 serves to close the magnetic path, promote and increase the generation of magnetic flux, and improve the coupling ability. Therefore, providing the magnetic permeable member 600 serves to close the magnetic paths between the first stator unit 401 and the first rotor unit 301, and between the second stator unit 402 and the second rotor unit 302, and can increase the magnetic flux. Further, providing the magnetic permeable member 600 is advantageous for reducing the overall diameter of the driving device 10. Also, by fixedly connecting both the magnetic core 410 of the first stator unit 401 and the magnetic core 410 of the second stator unit 402 to the magnetic permeable member 600, the magnetic permeable member 600 can be directly and fixedly connected to the housing assembly 100 to achieve the positioning and installation of the first stator unit 401 and the second stator unit 402, and reduce the assembly difficulty of the first stator unit 401 and the second stator unit 402. At the same time, the magnetic permeable member 600 provided in the above manner can also reduce the installation of the positioning structure within the housing assembly 100, simplify the structure of the housing assembly 100, and simplify the overall assembly process of the driving device 10.

[0035] Specifically, the permeable magnetic member 600 includes two permeable magnetic plates 610. The two permeable magnetic plates 610 are laminated. One permeable magnetic plate 610 is fixedly connected to the magnetic core 410 of the first stator unit 401, and the other permeable magnetic plate 610 is fixedly connected to the magnetic core 410 of the second stator unit 402. The shaft portion 210 is rotatably provided through the two permeable magnetic plates 610. Preferably, the two permeable magnetic plates 610 are separate bodies before assembly, and by providing the permeable magnetic member 600 as two separate permeable magnetic plates 610 before assembly, when assembling the driving device 10, first, the magnetic core 410 of the first stator unit 401 is fixedly connected to one permeable magnetic plate 610, the magnetic core 410 of the second stator unit 402 is fixedly connected to the other permeable magnetic plate 610, and then the two permeable magnetic plates 610 can be laminated. In this way, it is made easier to assemble the first stator unit 401 and the second stator unit 402 to the two permeable magnetic plates 610 respectively, and the assembly of the first stator unit 401 and the second stator unit 402 can be made easier.

[0036] Specifically, by fixedly connecting the two permeable magnetic plates 610, the first stator unit 401, the second stator unit 402, and the permeable magnetic member 600 are integrated and assembled in the housing assembly 100, and the assembly of the stator 400 becomes easier. For example, the two permeable magnetic plates 610 may be connected by adhesion or welding. In addition, in other embodiments, the two permeable magnetic plates 610 are not fixedly connected and are in contact with each other.

[0037] Note that the permeable magnetic member 600 is not limited to the method of combining the above two separate permeable magnetic plates 610. The permeable magnetic member 600 may have a plate-like structure, that is, the permeable magnetic member 600 may be one permeable magnetic plate 610. In this case, the first stator unit 401 and the second stator unit 402 share one permeable magnetic plate 610.

[0038] Specifically, the material of the permeable magnetic plate 610 is silicon steel, and the material of the magnetic core 410 is silicon steel.

[0039] Note that the structures of the rotor 300 and the stator 400 are not limited to the above structures. In some embodiments, the driving device 10 includes a first rotor unit 301, a second rotor unit 302, and a stator 400. However, the stator 400 has only one stator unit, and the stator unit is located between the first rotor unit 301 and the second rotor unit 302. The stator unit can drive the first rotor unit 301 and the second rotor unit 302 to rotate simultaneously. At this time, the magnetic flux permeable member 600 is omitted. Alternatively, in some embodiments, the rotor 300 has only one rotor unit, and the stator 400 has only one stator unit. At this time, the rotor unit is located between the stator unit and the first shaft sleeve 500, or the rotor unit is located between the stator unit and the second shaft sleeve 120. The number of stator units of the stator 400 and the number of rotor units of the rotor 300 can be adjusted as needed.

[0040] As shown in FIGS. 3 and 7, the first shaft sleeve 500 is attached to the housing assembly 100. Specifically, the first shaft sleeve 500 is accommodated in the cavity 102 of the housing assembly 100. The first shaft sleeve 500 is fixedly connected to the outer housing 110. The rotor 300, the stator 400, and the first shaft sleeve 500 are provided at intervals in the axial direction of the outer housing 110. In the illustrated embodiment, the first shaft sleeve 500 is located on the side away from the stator 400 of the first rotor unit 301.

[0041] In some embodiments, in order to avoid the first shaft sleeve 500 and the first rotor unit 301 from contacting and wearing each other, there is a certain gap between the first shaft sleeve 500 and the first rotor unit 301. However, in order to avoid the length of the rotating shaft 200 from being too long and improve the force-bearing situation of the rotating shaft 200, there is no need to make the distance between the two too large.

[0042] The first shaft sleeve 500 has a receiving cavity 501 and a shaft hole 502. The receiving cavity 501 is adapted to the ball head 220. The shaft hole 502 communicates with the receiving cavity 501. The ball head 220 is rotatably provided in the receiving cavity 501. The shaft portion 210 is rotatably penetrated through the shaft hole 502. To limit the ball head 220 within the receiving cavity 501, the aperture diameter of the shaft hole 502 is smaller than the diameter of the ball head 220. Specifically, the receiving cavity 501 is substantially spherical, or the cavity wall of the receiving cavity 501 defines a spherical structure.

[0043] Since one end of the shaft portion 210 away from the ball head 220 is rotatably penetrated through the through hole 101 of the housing assembly 100, the hole wall of the through hole 101 limits the swing range in the radial direction of one end of the shaft portion 210 away from the ball head 220. Also, the ball head 220 fixedly connected to one end of the shaft portion 210 is rotatably provided in the receiving cavity 501 adapted to the ball head 220. The diameter of the ball head 220 is larger than the aperture diameter of the shaft hole 502, limiting the ball head 220 within the receiving cavity 501. Thereby, the first shaft sleeve 500 limits the swing range in the radial direction of one end of the shaft portion 210 close to the ball head 220 and limits the movement range of the ball head 220 in the axial direction of the axis of the shaft portion 210 of the rotation shaft 200, that is, realizes the axial position limitation and the radial position limitation with respect to the rotation shaft 200. Also, there is no need to separately provide a thrust member, which is advantageous for simplifying the structure of the driving device 10 and reducing the assembly difficulty between the driving device 10 and the blood pump 1.

[0044] At the same time, the rotation shaft 200 and the first shaft sleeve 500, through the cooperation of the ball head 220 and the receiving cavity 501 adapted to the ball head 220, realize the swing range in the radial direction of one end of the rotation shaft 200 close to the ball head 220 and realize the movement range in the axial direction of the axis of the shaft portion 210 of the rotation shaft 200. Therefore, it is advantageous for reducing the friction between the ball head 220 and the first shaft sleeve 500 and reducing the wear of the rotation shaft 200.

[0045] Specifically, the accommodation cavity 501 and the ball head 220 being compatible means that the shape of the cavity wall of the accommodation cavity 501 and the shape of the ball head 220 are the same, and the diameter of the ball head 220 is slightly smaller than the diameter of the accommodation cavity 501. Thereby, not only can the ball head 220 rotate within the accommodation cavity 501, but the cavity wall of the accommodation cavity 501 can support the ball head 220 and restrict the ball head 220 in all directions. Moreover, the cavity wall of the accommodation cavity 501 and the surface of the ball head 220 are both smooth arc surfaces, meaning that wear between the two can be reduced.

[0046] As shown in FIGS. 7 and 8, the shaft hole 502 has a first opening 504 and a second opening 505. The shaft portion 210 is provided to penetrate through the first opening 504 and the second opening 505. The first opening 504 communicates with the accommodation cavity 501, and the second opening 505 is away from the accommodation cavity 501. Specifically, chamfers are provided at the edge of at least one of the first opening 504 and the second opening 505 to avoid the shaft portion 210 or the ball head 220 being damaged and worn by the angular opening of the shaft hole 502.

[0047] Specifically, the first shaft sleeve 500 further has a cleaning liquid hole 503 through which the cleaning liquid flows. The cleaning liquid hole 503 is in fluid communication with the accommodation cavity 501. The diameter of the cleaning liquid hole 503 is smaller than the diameter of the ball head portion 220 so that the ball head portion 220 is restricted within the accommodation cavity 501. Specifically, the cleaning liquid hole 503 can communicate with the cleaning line in the catheter 40 and be in fluid communication with the cleaning line, whereby the cleaning liquid can flow into the accommodation cavity 501 through the cleaning liquid hole 503.

[0048] Specifically, the cleaning liquid hole 503 has a third opening 506. The third opening 506 communicates with the accommodation cavity 501. The central axis of the third opening 506 passes through the center of the accommodation cavity 501 or through the center of the sphere where the accommodation cavity 501 is located, and the central axis of the third opening 506 coincides with the central axis of the shaft hole 502. In this way, the cleaning liquid can flow well between the cavity wall of the accommodation cavity 501 and the ball head 220, playing a lubricating role, reducing the friction coefficient between the ball head 220 and the cavity wall of the accommodation cavity 501, not only reducing the wear between the ball head 220 and the first shaft sleeve 500, but also enabling the cleaning liquid flowing into the accommodation cavity 501 from the cleaning liquid hole 503 to play a role of buoyancy support for the ball head 220. The opening of the cleaning liquid hole 503 away from the third opening 506 communicates with the cleaning line in the catheter 40. More specifically, since the central axis of the cleaning liquid hole 503 coincides with the central axis of the accommodation cavity 501, the cleaning liquid hole 503 becomes a straight hole, reducing the energy consumption of the cleaning liquid in the cleaning liquid hole 503.

[0049] In some embodiments, the diameter of the ball head 220 is defined as D1, and the diameter of one end of the shaft portion 210 close to the ball head 220 is defined as D2. In one embodiment, the diameter D1 of the ball head 220 is at least twice the diameter D2 of one end of the shaft portion 210 close to the ball head 220, that is, D1≥2D2. Thereby, by making the ball head 220 large enough, that is, by making the diameter of the ball head 220 large enough, when the ball head 220 contacts the cavity wall of the accommodation cavity 501, the ball head 220 and the cavity wall of the accommodation cavity 501 have a large contact area, reducing the wear of the ball head 220 and the cavity wall of the accommodation cavity 501. Specifically, in order to avoid the overall diameter of the blood pump 1 being too large, it is not necessary to make the diameter D1 of the ball head 220 too large.

[0050] In one embodiment, the diameter of the accommodation cavity 501 is defined as D3, and the ratio of the diameter D3 of the accommodation cavity 501 to the diameter D1 of the ball head 220 is 1.005 to 1.015, that is, D3:D1 is 1.005 to 1.015. By controlling the diameters of the accommodation cavity 501 and the ball head 220 to the above ratio, the ball head 220 can have a certain moving space within the accommodation cavity 501, ensuring that there is an appropriate space for filling the cleaning liquid in the accommodation cavity 501, not only ensuring the smooth flow of the cleaning liquid, but also restricting the axial movement and radial movement of the rotating shaft 200 within a reasonable range to ensure the stable rotation of the rotating shaft 200. At the same time, the wear between the ball head 220 and the cavity wall of the accommodation cavity 501 can be reduced. If the difference between the diameter of the ball head 220 and the diameter of the accommodation cavity 501 is too small, it will cause poor flow of the cleaning liquid and the buoyancy support effect of the cleaning liquid on the ball head 220 will be low. On the other hand, if the difference in diameter between the ball head 220 and the cavity wall of the accommodation cavity 501 is too large, the contact surface between the ball head 220 and the cavity wall of the accommodation cavity 501 will be too small, increasing the wear between the ball head 220 and the cavity wall of the accommodation cavity 501, and the movement of the ball head 220 within the accommodation cavity 501 will be large, making the operation of the driving device 10 unstable.

[0051] In one embodiment, the aperture diameter of the shaft hole 502 is defined as D4, and the ratio of the aperture diameter D4 of the shaft hole 502 to the diameter D2 of one end of the shaft portion 210 close to the ball head 220 is 1.15 to 1.35, that is, D4:D2 is 1.15 to 1.35. Due to reasons such as mounting or processing accuracy, when the first shaft sleeve 500 and the hole wall of the through hole 101 limit the position of the shaft portion 210, it is difficult to ensure the overlap or complete parallelism between the axis of the shaft portion 210 and the axial direction of the external housing 110. Therefore, in order to realize the fault tolerance of the shaft portion 210, it is necessary to ensure a gap space between the shaft hole 502 and the shaft portion 210. If the difference between the aperture diameter of the shaft hole 502 and the diameter of the shaft portion 210 is small, when the shaft portion 210 rotates, it will be pressed against or locked by the hole wall of the shaft hole 502, making the rotation of the rotating shaft 200 not smooth, and the wear at the contact position between the shaft portion 210 and the hole wall of the shaft hole 502 becomes serious. At the same time, if the difference between the aperture diameter of the shaft hole 502 and the diameter of the shaft portion 210 is small, it is disadvantageous for the cleaning liquid to flow from the accommodation cavity 501 into the cavity 102 of the housing assembly 100, and the flow of the cleaning liquid is not smooth. If the difference between the aperture diameter of the shaft hole 502 and the diameter of the shaft portion 210 is large, the swing of the shaft portion 210 is too large, and the contact area between the ball head 220 and the cavity wall of the accommodation cavity 501 becomes small. Especially when the ball head 220 contacts the cavity wall close to the shaft hole 502 of the accommodation cavity 501, the wear of the ball head 220 becomes serious.

[0052] In one embodiment, if the difference between the diameter D3 of the accommodation cavity 501 and the diameter D1 of the ball head 220 is defined as d1, and the difference between the aperture diameter D4 of the shaft hole 502 and the diameter D2 of a part of the shaft portion 210 close to the ball head 220 is defined as d2, then d2 is larger than d1. In this way, a fault tolerance space can be ensured for the shaft portion 210.

[0053] In one embodiment, the diameter of the third opening 506 of the cleaning liquid hole 503 is defined as D5, and the diameter D5 of the third opening 506 of the cleaning liquid hole 503 is 1 / 9 to 1 / 3 of the diameter D1 of the ball head 220. If the diameter of the third opening 506 of the cleaning liquid hole 503 is too large, the contact area between the ball head 220 and the cavity wall of the accommodation cavity 501 becomes small (the pressure received per unit area becomes large), increasing the wear of the ball head 220 by the cavity wall of the accommodation cavity 501. On the other hand, if the diameter of the third opening 506 is too small, it affects the amount of cleaning liquid flowing from the cleaning liquid hole 503 into the accommodation cavity 501. The cleaning liquid flowing into the cleaning liquid hole 503 applies an impact force to the ball head 220 and also flows between the ball head 220 and the cavity wall of the accommodation cavity 501 to play a lubricating role, reducing the friction coefficient between the ball head 220 and the cavity wall of the accommodation cavity 501. Therefore, it is not preferable that the amount of cleaning liquid flowing into the accommodation cavity 501 is too small.

[0054] Also, chamfers are provided at the edge of the third opening 506 of the cleaning liquid hole 503 to avoid damaging or wearing the ball head 220.

[0055] In some embodiments, the first shaft sleeve 500 includes a first fixing portion 510 and a second fixing portion 520. The first fixing portion 510 and the second fixing portion 520 jointly define the accommodation cavity 501 to accommodate the ball head 220 in the accommodation cavity 501. The first fixing portion 510 and the second fixing portion 520 may be fixed by adhesion, welding, engagement or other methods. There is no need for a physical fixed connection between the first fixing portion 510 and the second fixing portion 520, and they may just be in contact. Further, the first fixing portion 510 and the second fixing portion 520 may be provided opposite to each other, but there is a gap between them.

[0056] In one embodiment, as shown in FIGS. 3, 9, and 10, one side of the first fixing portion 510 is recessed to form a communicating first half hole 511 and a first hemispherical groove 512, and one side of the second fixing portion 520 is recessed to form a communicating second half hole 521 and a second hemispherical groove 522. The recessed side of the first fixing portion 510 and the recessed side of the second fixing portion 520 are provided opposite to each other. The first half hole 511 and the second half hole 521 jointly form a shaft hole 502, and the first hemispherical groove 512 and the second hemispherical groove 522 jointly form a receiving cavity 501. In this way, since the recessed side of the first fixing portion 510 and the recessed side of the second fixing portion 520 are provided opposite to each other, the assembly is convenient, and the ball head 220 can be wrapped from both the left and right sides of the ball head 220, and there is no need to consider the characteristics of the shaft portion 210. For example, if there are different diameter portions at the end of the shaft portion 210 close to the ball head 220, in order for the shaft portion 210 to fit into and penetrate the shaft hole 502, the diameter of the shaft hole 502 does not necessarily have to be larger than the maximum diameter of the shaft portion 210.

[0057] Specifically, the recessed side of the first fixing portion 510 is further recessed to form a first half liquid tank 513, and the recessed side of the second fixing portion 520 is further recessed to form a second half liquid tank 523. The first half liquid tank 513 and the second half liquid tank 523 jointly form a cleaning liquid hole 503.

[0058] In the embodiment shown in FIG. 9, the first shaft sleeve 500 is divided into a first fixing portion 510 and a second fixing portion 520 along a plane passing through the axis of the shaft portion 210. The first fixing portion 510 and the second fixing portion 520 are symmetrically distributed with respect to the plane passing through the axis of the shaft portion 210. In other embodiments, the first shaft sleeve 500 is divided into a first fixing portion 510 and a second fixing portion 520 along a plane forming a certain angle with the axis of the shaft portion 210, and the first fixing portion 510 and the second fixing portion 520 do not necessarily have the same size and shape.

[0059] In another embodiment, as shown in FIGS. 11 to 13, the first fixing portion 510 has a first hemispherical groove 512 and a shaft hole 502 communicating with the first hemispherical groove 512, and the second fixing portion 520 has a second hemispherical groove 522. The first hemispherical groove 512 and the second hemispherical groove 522 jointly form an accommodation cavity 501. At this time, the joint surface between the first fixing portion 510 and the second fixing portion 520 is provided so as to surround the axis of the shaft portion 210. The upper surface of the cavity wall of the accommodation cavity 501 is the first hemispherical groove 512 of the first fixing portion 510, and the lower surface of the cavity wall of the accommodation cavity 501 is the second hemispherical groove 522 of the second fixing portion 520. The upper and lower surfaces of the cavity wall of the accommodation cavity 501 are each formed independently without a joint gap, and the semi-circular shape is more complete. Therefore, the corresponding contact surfaces in the axial direction of the shaft portion 210 of the ball head 220 are all complete and smooth semi-circles, which is advantageous for reducing the wear between the ball head 220 and the cavity wall of the accommodation cavity 501, and can also reduce the requirements for the assembly process of the first fixing portion 510 and the second fixing portion 520.

[0060] In the embodiment shown in FIG. 11, the first shaft sleeve 500 is divided into a first fixing portion 510 and a second fixing portion 520 provided vertically along a plane substantially perpendicular to the axis of the shaft portion 210.

[0061] Furthermore, as shown in FIGS. 2 and 3, one end of the rotating shaft 200 is a ball head 220, which is rotatably supported by the first shaft sleeve 500, and the other end of the rotating shaft 200 is the end of the shaft portion 210 away from the ball head 220, which is rotatably supported by the second shaft sleeve 120. Thus, both ends of the rotating shaft 200 are supported, the force received is stable, and the operations of the rotating shaft 200 and the rotor 300 are stable.

[0062] Specifically, at least one of the first shaft sleeve 500 and the second shaft sleeve 120 is made of a ceramic material. Compared with metal materials, ceramics have high machining accuracy, high biocompatibility, high mechanical strength, and good wear resistance and corrosion resistance. In some embodiments, at least one of the first shaft sleeve 500 and the second shaft sleeve 120 has a shaft sleeve body and a diamond coating provided on the surface of the shaft sleeve body, which smooths the surfaces of the first shaft sleeve 500 and the second shaft sleeve 120 and improves wear resistance. In this case, the material of the shaft sleeve body may be a material having a certain rigidity, such as metal, ceramic, etc.

[0063] Specifically, as shown in FIG. 8, the roughness of at least one of the hole wall of the through hole 101, the surface of the shaft portion 210, the surface of the ball head 220, the cavity wall of the accommodation cavity 501, and the hole wall of the shaft hole 502 is 0.1 micrometer or less, thereby effectively reducing the frictional force between the shaft portion 210 and the hole wall of the through hole 101, the frictional force between the shaft portion 210 and the hole wall of the shaft hole 502, and the frictional force between the ball head 220 and the cavity wall of the accommodation cavity 501.

[0064] The above embodiments are only for explaining the technical solutions of the present invention and are not restrictive. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that the technical solutions described in each of the foregoing embodiments can be modified or equivalent replacements can be made for some of the technical features. These modifications and replacements do not deviate from the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of each embodiment of the present invention, and all should be included in the protection scope of the present invention.

Description of Reference Numerals

[0065] 1 Blood pump, 10 Driving device, 20 Impeller, 30 Cannula, 31 Blood inlet, 32 Blood outlet, 40 Catheter; 100 Housing assembly, 101 Through-hole, 102 Cavity, 110 External housing, 120 Second-axis sleeve; 200 Rotating shaft, 210 Shaft portion, 211 Connection end, 220 Ball head; 300 Rotor, 301 First rotor unit, 302 Second rotor unit, 310 Flywheel, 311 Disk-shaped portion, 312 Built-in pipe, 313 External pipe, 314 Annular cavity, 320 Magnet; 400 Stator, 401 First stator unit, 402 Second stator unit, 410 Magnetic core, 420 Coil; 500 First-axis sleeve, 501 Accommodating cavity, 502 Axial hole, 503 Cleaning liquid hole, 504 First opening, 505 Second opening, 506 Third opening, 510 First fixing portion, 511 First half hole, 512 First hemispherical groove, 513 First half liquid groove, 520 Second fixing portion, 521 Second half hole, 522 Second hemispherical groove, 523 Second half liquid tank; 600 Magnetic permeable member, 610 Magnetic permeable plate.

Claims

1. A housing assembly having a through hole, A rotating shaft having a shaft portion and a ball head fixedly connected to one end of the shaft portion, wherein one end of the shaft portion remote from the ball head is rotatably passed through the through hole, A first shaft sleeve attached to the housing assembly and having a receiving cavity and a shaft hole, wherein the receiving cavity is adapted to the ball head, the shaft hole communicates with the receiving cavity, the ball head is rotatably provided in the receiving cavity, the shaft portion is rotatably passed through the shaft hole, and the aperture diameter of the shaft hole is smaller than the diameter of the ball head so as to limit the ball head in the receiving cavity, and a first shaft sleeve, characterized in that the driving device comprises the same.

2. The diameter of the ball head is not less than twice the diameter of one end of the shaft portion close to the ball head, and the driving device according to claim 1 is characterized in that.

3. The receiving cavity is spherical, and the ratio of the diameter of the receiving cavity to the diameter of the ball head is 1.005 to 1.015, and the driving device according to claim 1 is characterized in that.

4. The receiving cavity is spherical, the difference between the diameter of the receiving cavity and the diameter of the ball head is defined as d1, and the difference between the aperture diameter of the shaft hole and the diameter of one end of the shaft portion close to the ball head is defined as d2. Then, d2 is larger than d1, and the driving device according to claim 1 is characterized in that.

5. The ratio of the aperture diameter of the shaft hole to the diameter of one end of the shaft portion close to the ball head is 1.15 to 1.35, and the driving device according to claim 1 is characterized in that.

6. The first shaft sleeve includes a first fixing portion and a second fixing portion, One side of the first fixing portion is recessed to form a first half hole and a first hemispherical groove communicating therewith, one side of the second fixing portion is recessed to form a second half hole and a second hemispherical groove communicating therewith, the recessed sides of the first fixing portion and the second fixing portion are provided opposite to each other, the first half hole and the second half hole jointly form the shaft hole, and the first hemispherical groove and the second hemispherical groove jointly form the receiving cavity. Alternatively, the first fixing part has a first hemispherical groove and the shaft hole communicating with the first hemispherical groove, the second fixing part has a second hemispherical groove, and the first hemispherical groove and the second hemispherical groove jointly form the accommodation cavity. The driving device according to claim 1 is characterized in that.

7. The first shaft sleeve further has a cleaning liquid hole through which the cleaning liquid flows. The cleaning liquid hole communicates with the accommodation cavity, and the central axis of the cleaning liquid hole overlaps with the central axis of the accommodation cavity. The driving device according to claim 1 is characterized in that.

8. The housing assembly includes an outer housing and a second shaft sleeve. The second shaft sleeve and the first shaft sleeve are both fixedly connected within the outer housing, and the through hole is formed in the second shaft sleeve. The driving device according to claim 1 is characterized in that.

9. One end of the rotating shaft is the ball head, the ball head is rotatably supported by the first shaft sleeve, the other end of the rotating shaft is the end away from the ball head of the shaft portion, and is rotatably supported by the second shaft sleeve. The driving device according to claim 8 is characterized in that.

10. The shaft hole has a first opening and a second opening. The first opening communicates with the accommodation cavity, the second opening is away from the accommodation cavity, and chamfers are provided at the edges of at least one of the first opening and the second opening. The shaft portion is provided to penetrate through the first opening and the second opening. The driving device according to claim 1 is characterized in that.

11. The driving device further includes a rotor and a stator provided along the axis of the shaft portion. The rotor and the stator are located between the first shaft sleeve and the through hole. The rotor is fixedly connected to the shaft portion, and the stator can drive the rotor to rotate. The driving device according to any one of claims 1 to 10 is characterized in that.

12. The rotor includes a flywheel and a magnet. The flywheel is fixedly connected to the shaft portion, and the magnet is fixedly connected to the flywheel. The stator is capable of generating a rotating magnetic field for driving the magnet to rotate. The flywheel includes a disk-shaped portion, a built-in pipe, and an external pipe. One ends of the built-in pipe and the external pipe are both fixedly connected to the disk-shaped portion. The built-in pipe and the external pipe are located on the same side of the disk-shaped portion and are coaxially provided. The inner diameter of the external pipe is larger than the outer diameter of the built-in pipe. The built-in pipe is at least partially accommodated in the external pipe. An annular cavity for accommodating the magnet is formed between the external pipe and the built-in pipe. The driving device according to claim 11, characterized in that.

13. The rotor includes a first rotor unit and a second rotor unit provided along the axis of the shaft portion. The stator includes a first stator unit and a second stator unit provided along the axis of the shaft portion. The first stator unit and the second stator unit are both located between the first rotor unit and the second rotor unit. The first stator unit can drive the first rotor unit to rotate. The second stator unit can drive the second rotor unit to rotate. The first stator unit and the second stator unit both include a magnetic core. The driving device further includes a magnetic permeable member fixedly connected to the housing assembly. The magnetic cores of the first stator unit and the second stator unit are both fixedly connected to the magnetic permeable member. The shaft portion is rotatably penetrated through the first stator unit, the second stator unit, and the magnetic permeable member. The driving device according to claim 11, characterized in that.

14. The first shaft sleeve further has a cleaning liquid hole through which the cleaning liquid flows. The cleaning liquid hole is in fluid communication with the accommodation cavity. The aperture diameter of the cleaning liquid hole is smaller than the diameter of the ball head. The driving device according to claim 1, characterized in that.

15. The cleaning liquid hole has a third opening, the third opening communicates with the accommodating cavity, the accommodating cavity is spherical, the central axis of the third opening passes through the center of the sphere where the accommodating cavity is located, and the central axis of the third opening overlaps with the central axis of the shaft hole. The driving device according to claim 14, characterized in that.

16. The diameter of the third opening of the cleaning liquid hole is 1 / 9 to 1 / 3 of the diameter of the ball head. The driving device according to claim 15, characterized in that.

17. The central axis of the shaft portion passes through the center of the ball head. The driving device according to claim 1, characterized in that.

18. The ball head has a ball body and a diamond coating provided on the surface of the ball body, or the material of the ball head is metal or ceramics. The driving device according to claim 1, characterized in that.

19. A blood pump including an impeller and a driving device, wherein the driving device A housing assembly having a through hole A rotating shaft having a shaft portion and a ball head fixedly connected to one end of the shaft portion, wherein one end of the shaft portion away from the ball head is rotatably penetrated through the through hole. A first shaft sleeve attached to the housing assembly and having an accommodating cavity and a shaft hole, the accommodating cavity conforms to the ball head, the shaft hole communicates with the accommodating cavity, the ball head is rotatably provided in the accommodating cavity, the shaft portion is rotatably penetrated through the shaft hole, and the aperture of the shaft hole is smaller than the diameter of the ball head so as to limit the ball head in the accommodating cavity. One end of the shaft portion away from the ball head is connected to the impeller. A blood pump, characterized by including a first shaft sleeve.

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