Medical fluid pumping device, motor assembly and rotor assembly

Abstract

The application relates to the field of medical devices, and discloses a medical fluid pumping device, a motor assembly and a rotor assembly, wherein the medical fluid pumping device comprises a motor assembly and a functional part; the motor assembly comprises a stator assembly, a rotor assembly, a support plate and a shell; part of the structure in the rotor assembly, the support plate and the stator assembly are arranged in the shell; the rotor assembly comprises a magnet; and the support plate is connected and fixed with the magnet in the axial direction of the motor assembly. The functional part is arranged outside the shell in the axial direction; and the rotor assembly is connected to the functional part. The side of the magnet facing the support plate is provided with a first fixing part; the side of the support plate facing the magnet is provided with a second fixing part; and the first fixing part and the second fixing part are arranged in axial plug-in fit.

Description

Technical Field

[0001] This application belongs to the field of medical devices, and in particular relates to a medical fluid pumping device, a motor assembly, and a rotor assembly. Background Technology

[0002] Medical fluid delivery devices are temporary medical devices used in the human body to assist in treatment and disease control. They utilize puncture needles, catheters, and other equipment to insert specific instruments into the body through natural orifices (such as blood vessels, digestive tract, and respiratory tract) or tiny incisions. Therefore, improving the reliability of medical fluid delivery devices is a key research focus for many manufacturers. Utility Model Content

[0003] This application provides a medical fluid pumping device, a motor assembly, and a rotor assembly, which can improve the reliability of the medical fluid pumping device.

[0004] On one hand, this application provides a medical fluid pumping device, which includes a motor assembly and functional components. The motor assembly includes a stator assembly, a rotor assembly, a support plate, and a housing. Parts of the rotor assembly, the support plate, and the stator assembly are housed within the housing. The rotor assembly includes a magnet, and the support plate is axially connected and fixed to the magnet. The functional components are located outside the housing, and the rotor assembly is connected to the functional components. A first fixing part is provided on the side of the magnet facing the support plate, and a second fixing part is provided on the side of the support plate facing the magnet. The first fixing part and the second fixing part are axially interlocked.

[0005] In some of these technical solutions, the rotor assembly and stator assembly work together to drive the functional components to rotate, thereby achieving the fluid pumping function. These functional components include, but are not limited to, impellers, screws, and gears.

[0006] In some embodiments, the motor assembly in the medical fluid pumping device is an axial field motor. Along the axial direction of the motor assembly, magnets are located on one side of the stator assembly and are spaced apart. In other embodiments, the motor assembly in the medical fluid pumping device is a radial field motor. The stator assembly has a cylindrical structure, and the rotor assembly passes through the stator assembly.

[0007] In some embodiments, the magnet includes a plurality of alternating first magnets and a plurality of second magnets arranged circumferentially along the annular axis. The magnetization directions of the first magnets are parallel to the axial direction, and the magnetization directions of the second magnets intersect the axial direction. The magnets and the stator assembly are spaced apart axially, and a support plate is located on the side of the magnets away from the stator assembly.

[0008] In some embodiments, the first fixing part includes a groove structure formed by the recess of the first magnet on the side surface facing the support plate, and the second fixing part includes a first protrusion protruding from the side surface of the support plate facing the magnet, the first protrusion being inserted into the groove structure.

[0009] In some embodiments, the circumferential dimension of the groove structure gradually increases in the direction from the support plate to the magnet; and / or,

[0010] The groove structure gradually increases in size in the radial direction of the motor assembly.

[0011] In some embodiments, within a virtual arc surface parallel to the circumferential direction and passing through the radial center of the first magnet, the first magnet includes a first cross section, and the groove structure has a second cross section, the area ratio of the first cross section to the second cross section being A, where A≥3.

[0012] In some embodiments, in the circumferential direction, the second magnet includes a magnetic body corresponding to the first magnet and a second protrusion protruding from the magnetic body toward the side of the support plate, the first fixing part includes the second protrusion, the second fixing part includes a mounting hole located in the support plate, and at least a portion of the structure of the second protrusion is located in the mounting hole.

[0013] In some embodiments, the second protrusion includes a first surface facing away from the magnetic body, the first magnet including a second surface facing the support plate, the area of ​​the first surface being larger than the area of ​​the second surface.

[0014] In some embodiments, the outer peripheral surface of the magnet is cylindrical.

[0015] In some embodiments, the first magnet includes a third surface facing the stator assembly and a second surface facing the support plate, wherein the projected area of ​​the third surface is greater than the projected area of ​​the second surface in a projection plane perpendicular to the axial direction.

[0016] In some embodiments, the second magnet includes a fourth surface facing the stator assembly and a fifth surface facing away from the stator assembly, wherein the projected area of ​​the fifth surface is larger than the projected area of ​​the fourth surface in a projection plane perpendicular to the axial direction; and / or,

[0017] The projected area of ​​the fifth surface is greater than the projected area of ​​the second surface; and / or,

[0018] The projected area of ​​the third surface is greater than the projected area of ​​the fourth surface.

[0019] In some embodiments, the dimension of the support plate in the axial direction is L1, where L1 ≤ 0.5 mm.

[0020] In some embodiments, an outflow channel is also included, which is located axially on one side of the housing, and the functional component is located within the outflow channel.

[0021] Secondly, embodiments of this application provide a motor assembly applied to a medical fluid pumping device. The motor assembly includes a housing, a stator assembly, a rotor assembly, and a support plate. The stator assembly is disposed within the housing, and the rotor assembly is at least partially disposed within the housing. The rotor assembly includes a magnet, which is spaced apart from the stator assembly along the axial direction of the motor assembly.

[0022] The support plate and the magnet are connected and fixed in the axial direction. The magnet has a first fixing part on the side facing the support plate, and the support plate has a second fixing part on the side facing the magnet. The first fixing part and the second fixing part are inserted and fitted in the axial direction.

[0023] Thirdly, embodiments of this application provide a rotor assembly applied to a motor assembly. The rotor assembly includes a magnet, which is axially connected to a support plate in the motor assembly. A first fixing part is provided on the side of the magnet facing the support plate, and a second fixing part is provided on the side of the support plate facing the magnet. The first fixing part and the second fixing part are axially inserted and engaged.

[0024] The medical fluid pumping device, motor assembly, and rotor assembly of this application embodiment have adjusted the structure of the magnet and the support plate. A first fixing part is provided on the magnet, and a second fixing part is provided on the support plate. The mechanical connection between the magnet and the support plate is achieved through the plug-in cooperation between the first fixing part and the second fixing part. Compared with the adhesive connection method, this design can enhance the fixing strength between the magnet and the support plate, reduce the risk of loosening between the magnet and the support plate during long-term operation, and improve the reliability of the medical fluid pumping device. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a cross-sectional structural schematic diagram of a medical fluid pumping device according to some embodiments of this application;

[0027] Figure 2 This is a schematic cross-sectional view of the magnet and support plate in a medical fluid pumping device according to some embodiments of this application;

[0028] Figure 3 This is a schematic cross-sectional view of the magnet and support plate in a medical fluid pumping device according to some embodiments of this application;

[0029] Figure 4 This is a schematic diagram of the unfolded structure of a magnet in a medical fluid pumping device according to some embodiments of this application;

[0030] Figure 5 This is an exploded structural diagram of the magnet and stator assembly in a medical fluid pumping device according to some embodiments of this application;

[0031] Figure 6 This is a schematic cross-sectional view of the magnet and support plate in a medical fluid pumping device according to some embodiments of this application;

[0032] Figure 7 This is a cross-sectional structural diagram of the magnet and support plate in a medical fluid pumping device according to some embodiments of this application.

[0033] Figure label:

[0034] 100. Motor assembly;

[0035] 10. Stator assembly; 11. Iron core; 12. Winding;

[0036] 20. Rotor assembly; 21. Magnet; 22. Shaft; 23. First magnet; 24. Second magnet; 241. Magnet body; 25. First fixing part; 251. Groove structure; 252. Second protrusion;

[0037] 30. Shell;

[0038] 40. Support plate; 41. Second fixing part; 411. First protrusion; 412. Mounting hole; 42. Plate body;

[0039] 51. Outflow channel; 52. Functional component; 53. Outflow window;

[0040] 60. Bearing structure;

[0041] M1, First surface; M2, Second surface; M3, Third surface; M4, Fourth surface; M5, Fifth surface;

[0042] X, axial direction; Y, radial direction; Z, circumferential direction. Detailed Implementation

[0043] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0045] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0046] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0047] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0048] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0049] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial X," "radial Y," and "circumferential Z" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0050] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0051] Medical fluid pumping devices often contain motors, which are the power components of these devices. During the use of these devices, mechanical vibrations are often generated due to the operation of the motors and other components. Some structures within the motor may loosen due to long-term vibration, which can affect the normal use of the motor and lead to reliability issues.

[0052] Regarding the above issues, firstly, please refer to [link / reference needed]. Figure 1 and Figure 2 This application provides a medical fluid pumping device, which includes a motor assembly 100 and a functional component 52. The motor assembly 100 includes a stator assembly 10, a rotor assembly 20, a support plate 40, and a housing 30. Some structures in the rotor assembly 20, the support plate 40, and the stator assembly 10 are all disposed within the housing 30. The rotor assembly 20 includes a magnet 21. The support plate 40 is connected and fixed to the magnet 21 in the axial direction X of the motor assembly 100.

[0053] Functional component 52 is located outside housing 30, and rotor assembly 20 is connected to functional component 52. Among them, magnet 21 has a first fixing part 25 on the side facing support plate 40, and support plate 40 has a second fixing part 41 on the side facing magnet 21. The first fixing part 25 and the second fixing part 41 are inserted and engaged in the axial direction X.

[0054] In some implementations of this application, the functional component is disposed outside the housing 30 along the axial direction X.

[0055] It is understood that the medical fluid pumping device of this application can deliver fluids within the body or in place of other fluids, including but not limited to blood, lymph, gas, and digestive fluids. The medical fluid pumping device can include interventional medical devices, implantable medical devices, and external medical devices. Functionally, the medical fluid pumping device can be used in ventricular assist systems, i.e., as a blood pumping device, or for thrombus aspiration, i.e., as a thrombus aspiration device. For ease of description and understanding, the following explanation will use a blood pumping device as an example.

[0056] Medical fluid pumping devices need to be introduced into the human body to enhance the heart's pumping function or achieve specific functions such as thrombus aspiration. The medical fluid pumping device provided in this application embodiment can take various forms; exemplarily, it includes, but is not limited to, blood pumping devices and thrombus aspiration devices. The motor assembly 100 is the power component of the medical fluid pumping device, used to drive the functional component 52 to rotate. The functional component 52 is used to contact blood and drive blood flow to meet the needs of the pumping function. The functional component 52 provided in this application embodiment can take various forms; exemplarily, it includes, but is not limited to, impellers and screws.

[0057] In some embodiments of this application, the motor assembly in the medical fluid pumping device is an axial magnetic field motor. Along the axial direction of the motor assembly, the magnet is located on one side of the stator assembly, and the two are spaced apart. In other embodiments of this application, the motor assembly in the medical fluid pumping device is a radial magnetic field motor. The stator assembly has a cylindrical structure, and the rotor assembly passes through the stator assembly. For ease of description and understanding, the following explanation will use an axial magnetic field motor as an example.

[0058] In some alternative embodiments, the medical fluid pumping device further includes an outflow channel 51 located on the same side of the magnet 21 and the stator assembly 10 in the axial direction X. The outflow channel 51 is a hollow structure and the functional component 52 is housed within it. An outflow window 53 is provided on the side wall of the outflow channel 51. The functional component 52 drives the blood in the outflow channel 51 to flow out through the outflow window 53 to achieve blood circulation.

[0059] The motor assembly 100 includes a stator assembly 10, a rotor assembly 20, a support plate 40, and a housing 30. The housing 30 is a hollow structure, and parts of the rotor assembly 20, the support plate 40, and the stator assembly 10 are located within the housing 30. The housing 30 protects the rotor assembly 20, the stator assembly 10, and the support plate 40. The proximal end of the housing 30 can be connected to an interventional catheter (not shown in the figure), while the distal end of the housing 30 faces the outflow channel 51. The proximal end of the housing 30 refers to the end facing the operator or physician, and the distal end refers to the end away from the operator or physician. The outflow channel 51 is located on the distal side of the housing 30. The housing 30 can be made of various materials; for example, it can be made of a biosafe material, such as metal or non-metal, like 316L stainless steel.

[0060] The stator assembly 10 remains fixed in position relative to the housing 30. Optionally, the stator assembly 10 includes an iron core 11 and a winding 12. The iron core 11 may be wound around the winding 12, or the winding 12 may be wound around the iron core 11. The iron core 11 is connected to the housing 30 to achieve relative fixation between the stator assembly 10 and the housing 30. The rotor assembly 20 includes a magnet 21 located inside the housing 30. The rotor assembly 20 is connected to the functional component 52. Optionally, the rotor assembly 20 also includes a shaft 22. The magnet 21 is sleeved on the shaft 22. The shaft 22 is partially located inside the housing 30 and partially extends outside the housing 30 and is connected to the functional component 52 in the outflow channel 51. When the winding 12 is energized, the winding 12 generates a magnetic field and interacts with the magnetic field of the magnet 21, causing the magnet 21 to rotate. The magnet 21 drives the rotating shaft 22 to rotate synchronously with the functional component 52, and the rotation of the functional component 52 will drive the blood flow, thereby realizing specific functions such as blood pumping or thrombus aspiration.

[0061] In some other embodiments of this application, the stator assembly 10 includes a winding 12, and the portion of the motor assembly opposite to the winding serves as the core. This embodiment is the same as the previous embodiment in other parts, and will not be described in detail here.

[0062] The specific positional relationship between the magnet 21 and the stator assembly 10 is not limited in this embodiment. For example, the magnet 21 may be disposed on the proximal side of the stator assembly 10 near the housing 30, or the magnet 21 may be disposed on the distal side of the stator assembly 10 near the housing 30.

[0063] It should be noted that the magnet 21 can be the main component in the motor assembly 100 used to realize the driving function, that is, the axial magnetic field coupling between the magnet 21 and the stator assembly 10 provides the main driving force for the operation of the motor assembly 100. Alternatively, in some embodiments, the magnet 21 can also play an auxiliary role in driving the motor assembly 100. For example, in addition to the axial magnetic field coupling between the magnet 21 and the stator assembly 100, the motor assembly 100 can also include radial magnetic field coupling. The radial magnetic field coupling provides the main driving force for the operation of the motor assembly 100, while the axial magnetic field coupling plays an auxiliary role to the radial magnetic field coupling to improve the reliability of the radial magnetic field.

[0064] In some embodiments of this application, the support plate 40 is fixed to the magnet 21 and rotates synchronously with the magnet 21. The support plate 40 and the magnet 21 are connected in the axial direction X, and the support plate 40 is located on the side of the magnet 21 away from the stator assembly 10, that is, the magnet 21 is located between the support plate 40 and the stator assembly 10 in the axial direction X.

[0065] The material composition of the support plate 40 is not limited in this embodiment. Optionally, the support plate 40 may include a magnetic yoke material, which is used to guide the magnetic field to reduce the leakage magnetic diffusion of the motor assembly 100 on the side of the magnet 21 away from the stator assembly 100, thereby reducing the risk of leakage magnetic flux. Of course, in some other embodiments, the support plate 40 may not have a magnetic yoke material.

[0066] In related technologies, the support plate 40 and the magnet 21 are usually fixed by adhesive. However, during long-term operation, the adhesive strength between the magnet 21 and the support plate 40 is prone to decrease due to factors such as the vibration of the motor assembly 100 itself. This can lead to the risk of loosening between the magnet 21 and the support plate 40, affecting the reliability of the medical fluid pumping device.

[0067] Therefore, the structure of the magnet 21 and the support plate 40 has been adjusted in this embodiment. Specifically, a first fixing part 25 is provided on the side of the magnet 21 facing the support plate 40, and a second fixing part 41 is provided on the side of the support plate 40 facing the magnet 21. The first fixing part 25 and the second fixing part 41 can be inserted into each other in the axial direction X. This insertion into each other is a mechanical connection method, meaning that one component is designed to be inserted into another component. In other words, one of the first fixing part 25 and the second fixing part 41 can be inserted into the other to achieve relative fixation between them.

[0068] The specific structural forms of the first fixing part 25 and the second fixing part 41 are not limited in this application embodiment. The first fixing part 25 can be a solid structure, or it can be a spatial structure such as a groove or a hole, and the second fixing part 41 is similarly designed. For example, one of the first fixing part 25 and the second fixing part 41 includes a groove, and the other includes a protrusion. The groove and the protrusion are interlocked to fix the position between the support plate 40 and the magnet 21. It is understood that this application does not specifically limit the structure of the first fixing part 25 and the second fixing part 41; their compatibility to a certain extent is within the scope of protection of this application.

[0069] In summary, the embodiments of this application have adjusted the structure of the magnet 21 and the support plate 40. A first fixing part 25 is provided on the magnet 21, and a second fixing part 41 is provided on the support plate 40. Through the insertion and cooperation between the first fixing part 25 and the second fixing part 41, a mechanical connection between the magnet 21 and the support plate 40 is achieved. Compared with the adhesive connection method, this design can enhance the fixing strength between the magnet 21 and the support plate 40, reduce the risk of loosening between the magnet 21 and the support plate 40 during long-term operation, and improve the reliability of the medical fluid pumping device.

[0070] It should be noted that, in addition to the aforementioned components, the medical fluid pumping device may also include other structures, and this application embodiment does not impose any limitations on this. Optionally, the medical fluid pumping device may further include an infusion line and a drainage line (neither shown in the figure). This application embodiment does not impose any limitations on the specific structure of the infusion line and the drainage line, nor on their positional relationship relative to the motor assembly 100; they can be designed with reference to the layout of infusion lines and drainage lines in related technologies. Furthermore, this application embodiment does not impose any limitations on the shape and structural form of the housing 30. Optionally, the housing 30 may include a housing body and a first cover and a second cover. The first cover and the second cover are located on opposite sides of the housing body along the axial direction X to achieve sealing and covering of the housing body. The first cover is located at the proximal end of the housing 30, while the second cover is located at the distal end of the housing 30.

[0071] In addition to the stator assembly 10, rotor assembly 20, support plate 40, and housing 30, the motor assembly 100 may also include other structures, and the embodiments of this application are not limited thereto. For example, the motor assembly 100 also includes a bearing structure 60 sleeved on the rotating shaft 22. The bearing structure 60 is fixed inside the housing 30, and the rotating shaft 22 can rotate relative to the housing 30 through the bearing structure 60.

[0072] In some embodiments, please refer to Figures 1 to 5 In the circumferential direction Z along the X-axis, the magnet 21 includes a plurality of alternating first magnets 23 and a plurality of second magnets 24. The magnetization direction of the first magnets 23 is parallel to the X-axis, and the magnetization direction of the second magnets 24 intersects the X-axis. The magnets 21 and the stator assembly 10 are spaced apart along the X-axis, and the support plate 40 is located on the side of the magnets 21 opposite to the stator assembly 10.

[0073] It is understood that in the embodiments of this application, the magnetization direction of the first magnet 23 is parallel to the axial direction X. This can mean that the magnetization direction of the first magnet 23 is completely parallel to the axial direction X, or the two directions can be allowed to deviate to a certain extent. For example, the angle between the magnetization direction of the first magnet 23 and the axial direction X is 5° or 10°, etc., which are all within the protection scope of this application. This application does not make specific limitations on this.

[0074] The magnetization direction of the second magnet 24 intersects the axial direction X. In some embodiments of this application, the magnetization direction of the second magnet 24 may be perpendicular to the axial direction X. Similarly, alternatively, the magnetization directions of the first magnet 23 and the second magnet 24 may be perpendicular, i.e., the angle between their magnetization directions is 90°. Alternatively, the two magnetization directions may intersect but not be perpendicular, for example, the angle between their magnetization directions may be 30°, 45°, and 60°.

[0075] It is understandable that when the magnetization direction of the first magnet 23 is perpendicular to the axial direction X, since the fourth surface M4 of the second magnet 24 facing the stator assembly 10 can be perpendicular to the axial direction X, the magnetization direction of the second magnet 24 can be parallel to the circumferential direction Z, or any other direction parallel to the fourth surface M4.

[0076] In this embodiment, the motor assembly 100 is driven not by radial magnetic field coupling rotation, but by axial magnetic field coupling, thereby reducing the inflexible size of the medical fluid pumping device in the axial direction X. Specifically, in the circumferential direction Z around the axis X, the magnet 21 includes a plurality of alternating first magnets 23 and a plurality of second magnets 24. The circumferential direction Z refers to a circular direction rather than a straight line direction, and is perpendicular to both the axial direction X of the motor assembly 100 and the radial direction Y of the motor assembly 100 at the corresponding position. Further, the circumferential direction Z around the axis X refers to the circumferential direction surrounding a virtual straight line that passes through the center of the magnet 21 and extends along the axial direction X. Figures 2 to 4 This is a schematic diagram of the structure of magnet 21 in its unfolded state. Figures 2 to 4 In the diagram, the circumferential Z direction is shown as a straight line, and Figure 2 and Figure 3 Two types of magnets 21 are shown respectively.

[0077] In some embodiments of this application, the first magnet 23 and the second magnet 24 can both be permanent magnets, and they have different magnetization directions. The magnetization direction refers to the spatial orientation of the internal magnetic moment of the magnet structure after it has been magnetized in an external magnetic field. Multiple first magnets 23 and second magnets 24, arranged alternately and with different magnetization directions, together form a special array of magnet structures. This special array of magnet structures includes axially magnetized magnets and circumferentially magnetized magnets. The first magnet 23 is an axially magnetized magnet, and its magnetization direction is parallel to the axial direction X. The second magnet 24 is a circumferentially magnetized magnet, and its magnetization direction intersects the axial direction X. Further, the magnetization direction of the second magnet 24 is perpendicular to both the radial direction Y and the axial direction X at its corresponding position.

[0078] In this embodiment, the motor assembly 100 is capable of axial magnetic field coupling rotation, generating different magnetic fluxes not in the radial Y direction, but in the axial X direction. As can be seen from the accompanying drawings, the magnet 21 has a stronger magnetic flux on the side facing the stator assembly 10, and a weaker magnetic flux on the side facing the support plate 40. That is, the magnetic flux of the magnet 21 on the proximal side facing the housing 30 is greater than the magnetic flux of the magnet 21 on the distal side facing the housing 30.

[0079] Due to the change in the magnetic field configuration, compared to the radial magnetic field coupling scheme, the axial magnetic field coupling scheme in this application can further reduce the combined size of the stator assembly 10 and the magnet 21 in the axial direction (X). In other words, by adjusting the structure of the motor assembly 100, the embodiments of this application reduce the inflexible size of the medical fluid pumping device in the axial direction (X), thereby reducing damage to human tissues and simplifying the interventional procedure.

[0080] It should be noted that the first fixing part 25 can have various positional forms relative to the first magnet 23 and the second magnet 24, and the embodiments of this application do not limit this. For example, the first fixing part 25 can be disposed on the first magnet 23, or the first fixing part 25 can also be disposed on the second magnet 24, or the first fixing part 25 can be partially disposed on the first magnet 23 and partially disposed on the second magnet 24.

[0081] In summary, in this embodiment, the magnet 21 and the stator assembly 10 are spaced apart along the axial direction X, and the magnet 21 is provided with a first magnet 23 and a second magnet 24 with different magnetization directions. In this way, the magnet 21, which has an alternating distribution of circumferentially magnetized magnets and axially magnetized magnets, is applied to the medical fluid pumping device, thereby reducing the inflexible size of the medical fluid pumping device in the axial direction X and helping to increase the driving capability of the motor assembly 100.

[0082] Furthermore, the driving capability of the motor assembly 100 is often positively correlated with the degree of vibration during its operation. In view of this, the embodiment of this application achieves a mechanical connection between the support plate 40 and the magnet 21 by inserting the first fixing part 25 and the second fixing part 41. Compared with the adhesive connection, this design can improve the connection strength between the support plate 40 and the magnet 21 so as to match the stronger vibration level corresponding to the motor assembly 100, thereby reducing the risk of relative loosening of the magnet 21 and the support plate 40 during long-term operation and improving the reliability and service life of the medical fluid pumping device.

[0083] It should be noted that in the embodiments of this application, a single second magnet 24 can be a magnet structure with a single magnetization direction, or a single second magnet 24 can also include multiple magnet structures with different magnetization directions, as long as the magnetization direction of each magnet structure in the second magnet 24 intersects with the magnetization direction of the first magnet. The embodiments of this application do not impose any restrictions on this.

[0084] In some embodiments, such as Figure 2 and Figure 3 As shown, the first fixing part 25 includes a groove structure 251 formed by the recess of the first magnet 23 on the side surface facing the support plate 40, and the second fixing part 41 includes a first protrusion 411 protruding from the side surface of the support plate 40 facing the magnet 21, and the first protrusion 411 is inserted into the groove structure 251.

[0085] The groove structure 251 is disposed on the first magnet 23 and is formed by recessing inward from the surface of the first magnet 23 facing the support plate 40. The groove structure 251 can have various shapes and sizes, and the embodiments of this application do not limit this. Optionally, such as Figure 2 and Figure 3As shown, the longitudinal cross-sectional shape of the groove structure 251 can be triangular, or in other embodiments, the shape of the groove structure 251 can also be rectangular, trapezoidal, or other regular or irregular shapes.

[0086] The first protrusion 411 protrudes from the surface of the support plate 40 facing the magnet 21. Optionally, the support plate 40 also includes a plate body 42, with the first protrusion 411 protruding relative to the plate body 42. The first protrusion 411 and the plate body 42 can be an integral structure, meaning they are made of the same material and formed together in the same injection molding or stamping process. Alternatively, the first protrusion 411 and the plate body 42 can be separate structures, made of different materials and fixed relative to each other by welding or bolting.

[0087] The shape and size of the first protrusion 411 are not limited in this embodiment, as long as at least a portion of the structure of the first protrusion 411 can be located within the groove structure 251 and engage with it. Specifically, the first protrusion 411 can be completely located within the groove structure 251, in which case the plate body 42 and the second magnet 24 can contact each other in the axial direction X. Alternatively, the first protrusion 411 can also be partially located outside the groove structure 251, in which case the plate body 42 and the second magnet 24 form a gap space in the axial direction X.

[0088] In some alternative embodiments, both the groove structure 251 and the first protrusion 411 are axisymmetric. Furthermore, the first magnet 23 may be axisymmetric, which helps to reduce the design difficulty of multiple first magnets 23 and multiple second magnets 24 and improve the contact reliability between the first magnets 23 and the second magnets 24.

[0089] In this embodiment, by providing a groove structure 251 on the magnet 21 and a first protrusion 411 on the support plate 40, the mechanical connection between the magnet 21 and the support plate 40 is achieved through the insertion and engagement between the first protrusion 411 and the groove structure 251. This improves the fixation strength between the two, reduces the risk of loosening between the magnet 21 and the support plate 40 during long-term operation, and improves the reliability of the medical fluid pumping device.

[0090] Furthermore, considering that the groove structure 251 is located on the side of the magnet 21 away from the stator assembly 10, and that the second magnet 24 on the side of the magnet 21 away from the stator assembly 10 can play a magnetic field guiding role, thereby achieving magnetic circuit closed loop and reducing the risk of magnetic leakage, this embodiment of the application sets the groove structure 251 on the first magnet 23 instead of the second magnet 24. This improves the structural integrity of the second magnet 24 on the side away from the stator assembly 10, allowing the second magnet 24 to have a certain magnetic field guiding effect, thereby reducing the risk of magnetic leakage of the motor assembly 100.

[0091] In some embodiments, the groove structure 251 gradually increases in size in the circumferential Z direction in the direction from the support plate 40 to the magnet 21; and / or, the groove structure 251 gradually increases in size in the radial Y direction of the motor assembly 100. Figure 2 and Figure 3 The diagram shows the gradual increase in size of the groove structure 251 in the circumferential direction Z.

[0092] In this embodiment, at least one of the circumferential Z-dimensional dimension and the radial Y-dimensional dimension of the groove structure 251 at different positions in the axial X direction is not fixed, but exhibits a certain dimensional variation trend. Taking the gradual increase of the circumferential Z-dimensional dimension of the groove structure 251 as an example, the closer to the support plate 40, the larger the circumferential Z-dimensional dimension of the groove structure 251. This design allows the groove structure 251 to have a larger opening structure on the side facing the support plate 40. The larger opening structure can help reduce the insertion difficulty between the first protrusion 411 and the groove structure 251, and improve the insertion reliability between the support plate 40 and the magnet 21.

[0093] Furthermore, the closer to the stator assembly 10, the smaller the circumferential dimension of the groove structure 251 in the Z direction. This design reduces the impact of the groove structure 251 on the portion of the first magnet 23 closest to the stator assembly 10, thereby reducing the adverse effect on the magnetic field of the first magnet 23 facing the stator assembly 10. In other words, this design reduces the adverse impact of the presence of the groove structure 251 on the driving capability of the motor assembly 100 itself, enhancing the operational reliability of the motor assembly 100.

[0094] In some alternative embodiments, the groove structure 251 gradually increases in size in the circumferential direction Z in the direction from the support plate 40 to the magnet 21, and the groove structure 251 gradually increases in size in the radial direction Y of the motor assembly 100.

[0095] It should be noted that, in order to improve the reliability of the fit between the first protrusion 411 and the groove structure 251, the shape and size of the first protrusion 411 need to match the shape and size of the groove structure 251. Therefore, in some optional embodiments, the size of the first protrusion 411 gradually increases in the circumferential direction Z in the direction parallel to the axial direction X and close to the support plate 40; and / or, the size of the first protrusion 411 gradually increases in the radial direction Y. Further optionally, the size of the first protrusion 411 gradually increases in the circumferential direction Z in the direction parallel to the axial direction X and close to the support plate 40, and the size of the first protrusion 411 gradually increases in the radial direction Y.

[0096] In some embodiments, such as Figures 1 to 3As shown, within a virtual arc surface parallel to the circumferential direction Z and passing through the radial center of the first magnet 23, the first magnet 23 includes a first cross-section, and the groove structure 251 has a second cross-section. The area ratio of the first cross-section to the second cross-section is A, where A ≥ 3. Optionally, A is one of 3, 4, 5, 6, and 8.

[0097] The radial center is the center of the first magnet 23 in the radial direction Y, and the virtual arc surface is a virtual surface that is axially aligned with the X direction and passes through the radial center of the first magnet 23. Figure 2 and Figure 3 This can be considered as the shape and size of the magnet 21 and the support plate 40 on the virtual arc surface in the unfolded state. Among them, the first magnet 23 can have a symmetrical shape, and the center of the first magnet 23 is the center position of an object with a certain degree of symmetry.

[0098] The first magnet 23 has a first cross-section on the virtual arc surface, and the groove structure 251 has a second cross-section on the virtual arc surface. In the figure, the second cross-section is indicated by a dashed line. The area of ​​the first cross-section is S1, and the area of ​​the second cross-section is S2, where A = S1 / S2.

[0099] In this embodiment of the application, by setting the area ratio A of the first cross section to the second cross section to be not less than 3, the first magnet 23 has a certain volume, which reduces the adverse effect of the groove structure 251 on the overall driving capability of the motor assembly 100. While meeting the need for plug-in connection between the magnet 21 and the support plate 40, the overall driving capability of the motor assembly 100 is also taken into account.

[0100] In some embodiments, please refer to Figure 1 and Figure 6 In the circumferential direction Z, the second magnet 24 includes a magnetic body 241 corresponding to the first magnet 23, and a second protrusion 252 protruding from the magnetic body 241 toward the support plate 40. The first fixing part 25 includes the second protrusion 252, and the second fixing part 41 includes a mounting hole 412 located in the support plate 40. At least a portion of the structure in the second protrusion 252 is located in the mounting hole 412.

[0101] The magnetic body 241 is the part of the second magnet 24 that corresponds to the first magnet 23 in the circumferential Z direction. In other words, the magnetic body 241 does not extend beyond the first magnet 23 in the axial X direction. The second protrusion 252 protrudes from the side of the magnetic body 241 facing the support plate 40, that is, the second protrusion 252 is set beyond the surface of the first magnet 23 facing the support plate 40.

[0102] The dimensions and shape of the second protrusion 252 are not limited in this embodiment. Optionally, as shown in the figure, the cross-sectional shape of the second protrusion 252 is rectangular, and the second protrusion 252 can completely cover the magnetic body 241. Alternatively, in other embodiments, the cross-sectional shape of the second protrusion 252 may also be triangular, trapezoidal, or other regular or irregular shapes.

[0103] The mounting hole 412 is located inside the support plate 40 and is used to engage with the second protrusion 252. The mounting hole 412 can be configured to completely penetrate the support plate 40 in the axial direction X, meaning it is a through-hole structure with two opposing openings in the axial direction X. Alternatively, the mounting hole 412 can be configured not to penetrate the support plate 40 in the axial direction X, meaning it is a blind hole structure with an opening only on the side facing the magnet 21.

[0104] The shape and size of the mounting hole 412 are not limited in this embodiment, as long as at least a portion of the structure of the second protrusion 252 can be located within the mounting hole 412 to achieve a plug-in fit. Specifically, the second protrusion 252 can be completely located within the mounting hole 412, in which case the support plate 40 and the first magnet 23 can contact each other in the axial direction X. Alternatively, the second protrusion 252 can also be partially located outside the mounting hole 412, in which case the support plate 40 and the second magnet 24 are spaced apart in the axial direction X to form a gap space.

[0105] In this embodiment, by providing a second protrusion 252 on the magnet 21 and a mounting hole 412 on the support plate 40, the mechanical connection between the magnet 21 and the support plate 40 is achieved through the insertion and engagement between the second protrusion 252 and the mounting hole 412. This improves the fixation strength between the two, reduces the risk of loosening between the magnet 21 and the support plate 40 during long-term operation, and improves the reliability of the medical fluid pumping device.

[0106] Furthermore, since the second protrusion 252 is disposed on the second magnet 24 and protrudes relative to the first magnet 23 in the axial X direction, the second magnet 24 can have a larger size in the axial X direction, thereby improving its guiding effect on the magnetic field and improving the operational reliability of the motor assembly 100. In addition, as can be seen from the accompanying drawings, the magnetic field generated by the first magnet 23 away from the stator assembly 10 can be guided not only by the second magnet 24 to the surface of the second protrusion 252 away from the stator assembly 10 to achieve magnetic circuit closed loop, but also to the side of the second protrusion 252 in the circumferential Z direction to achieve magnetic circuit closed loop. Therefore, this design helps to further reduce the leakage magnetic risk of the motor assembly 100.

[0107] It should be noted that, in conjunction with the aforementioned embodiments, depending on the actual needs, the first fixing part 25 may only include the groove structure 251, in which case the second fixing part 41 may only include the first protrusion 411. Alternatively, the first fixing part 25 may only include the second protrusion 252, in which case the second fixing part 41 may only include the mounting hole 412. Or, the first fixing part 25 may include both the groove structure 251 and the second protrusion 252, in which case the second fixing part 41 may include both the first protrusion 411 and the mounting hole 412.

[0108] In some embodiments, such as Figure 1 and Figure 6 As shown, the second protrusion 252 includes a first surface M1 facing away from the magnetic body 241, and the first magnet 23 includes a second surface M2 facing the support plate 40. The area of ​​the first surface M1 is larger than the area of ​​the second surface M2.

[0109] The first surface M1 is the surface of the second protrusion 252 facing away from the stator assembly 10, and the second surface M2 is the surface of the first magnet 23 facing away from the stator assembly 10. With the assistance of the second magnet 24, a magnetic circuit closed loop can be formed between the first surface M1 and the second surface M2. Based on this, this embodiment adjusts the shape and size of at least one of the first magnet 23 and the second magnet 24, reducing the area of ​​the first surface M1 to be larger than the area of ​​the second surface M2, so that the first surface M1 has a larger surface area. In this way, more magnetic fields can be attracted to the first surface M1 to achieve a magnetic circuit closed loop, thereby helping to improve the leakage magnetic problem of the motor assembly 100.

[0110] Furthermore, the area of ​​the first surface M1 is usually positively correlated with the volume of the second protrusion 252. Therefore, by setting the first surface M1 to have a larger area, the second protrusion 252 can have a corresponding volume, which helps to improve the insertion strength between the second protrusion 252 and the mounting hole 412 and reduce the risk of loosening between the magnet 21 and the support plate 40 during operation.

[0111] In some embodiments, such as Figure 1 , Figure 2 , Figure 3 and Figure 6 As shown, the outer peripheral surface of magnet 21 is cylindrical. This embodiment applies to both cases where the first magnet 23 has a groove structure 251 and the second magnet 24 has a first protrusion 411, and cases where the first magnet 23 has a second protrusion 252 and the second magnet 24 has a mounting hole 412.

[0112] The outer peripheral surface of magnet 21 is its circumferential surface. This outer peripheral surface is a continuous, flat surface and is cylindrical. In other words, the outer peripheral surface of magnet 21 in this embodiment can have the same shape as the outer peripheral surface of a conventional magnet 21. In other words, this embodiment can achieve a mechanical connection between magnet 21 and support plate 40 without changing the shape of the outer peripheral surface of magnet 21, thereby enhancing the connection strength between the two.

[0113] Furthermore, in some alternative embodiments, the volume of the first magnet 23 is larger than the volume of the second magnet 24.

[0114] As can be seen from the accompanying drawings, if the first fixing part 25 includes a groove structure 251, the presence of the groove structure 251 will reduce the volume of the first magnet 23. If the first fixing part 25 includes a second protrusion 252, the presence of the second protrusion 252 will increase the volume of the second magnet 24. In a conventional scheme where axially magnetized magnets and circumferentially magnetized magnets are alternately distributed, the circumferentially magnetized magnets and the axially magnetized magnets have the same or similar volumes. Based on this, if a groove is directly provided on the axially magnetized magnet or a protrusion is provided on the circumferentially magnetized magnet, the volume of the circumferentially magnetized magnet will be larger than the volume of the axially magnetized magnet, which will lead to a decrease in the driving capability of the motor assembly 100.

[0115] However, in this embodiment, in addition to providing a first fixing part 25 on the magnet 21, the volume of the first magnet 23 and the second magnet 24 is also limited. The volume of the first magnet 23 is set to be larger than that of the second magnet 24. This can improve the reliability of the connection between the magnet 21 and the support plate 40, while enhancing the driving capability of the motor assembly 100, thus achieving a balance between reliability and driving capability.

[0116] In some embodiments, such as Figure 3 and Figure 6 As shown, the first magnet 23 includes a third surface M3 facing the stator assembly 10 and a second surface M2 facing the support plate 40. In a projection plane perpendicular to the axial direction X, the projected area of ​​the third surface M3 is greater than the projected area of ​​the second surface M2.

[0117] The magnitude of the magnetic flux of magnet 21 on the side near stator assembly 10 is often positively correlated with the driving capability of motor assembly 100. This magnetic flux is often determined by the surface dimensions of the first magnet 23 facing stator assembly 10. Therefore, this embodiment also adjusts the shape and dimensions of the first magnet 23. Specifically, the third surface M3 is the surface of the first magnet 23 facing stator assembly 10, and the second surface M2 is the surface of the first magnet 23 away from stator assembly 10. Typically, in a projection plane perpendicular to the X-axis, the third surface M3 and the second surface M2 have the same or similar projected area. Here, the projection plane refers to any virtual plane perpendicular to the X-axis, and the projected area of ​​the third surface M3 refers to the area of ​​the third surface M3 projected onto this projection plane; the same applies to the projected area of ​​the second surface M2.

[0118] For a scheme where axially and circumferentially magnetized magnets are alternately distributed, since the motor assembly 100 achieves rotational drive using axial magnetic field coupling, one of the main factors affecting the strength of this axial magnetic field is the effective area of ​​the third surface M3 (the surface of the axially magnetized magnet facing the stator assembly 10) relative to the surface of the core 11 facing the axially magnetized magnet. In other words, it is the projected area of ​​the third surface M3 in the direction perpendicular to the surface of the core 11 facing the axially magnetized magnet. Optionally, the surface of the core 11 facing the axially magnetized magnet can be perpendicular to the axial direction X. Therefore, the projected area of ​​the third surface M3 in the projection plane perpendicular to the axial direction X is one of the main factors affecting the driving capability of the motor assembly 100.

[0119] Considering the above, this embodiment adjusts the size and shape of the first magnet 23, increasing the projected area of ​​the surface of the first magnet 23 facing the stator assembly 10, so that the projected area of ​​the third surface M3 is larger than that of the second surface M2. The increased projected area of ​​the third surface M3 helps to enhance the magnetic flux of the first magnet 23 facing the stator assembly 10, improving the axial magnetic field coupling effect between the magnet 21 and the stator assembly 10, thereby improving the overall driving capability of the motor assembly 100. Simultaneously, since the second surface M2 has a smaller projected area than the third surface M3, it helps to reduce the magnetic flux of the first magnet 23 facing away from the stator assembly 10, thereby improving the magnetic leakage problem of the magnet 21 on the side facing away from the stator assembly 10.

[0120] It should be noted that the actual area of ​​the third surface M3 is not limited in this embodiment. The third surface M3 can be a planar structure perpendicular to the axis X, in which case the actual area of ​​the third surface M3 is consistent with its corresponding projected area. However, when the third surface M3 includes structures such as folded surfaces and curved surfaces, or when the third surface M3 is not perpendicular to the axis X, the actual area of ​​the third surface M3 is often larger than its corresponding projected area.

[0121] The actual area of ​​the second surface M2 is similar. When the first magnet 23 has a groove structure 251, the second surface M2 is the wall of the groove structure 251, and the actual area of ​​the second surface M2 is often larger than its corresponding projected area. When the first magnet 23 does not have a groove structure 251, and the first surface M1 is perpendicular to the axial direction X, the actual area of ​​the second surface M2 is the same as its corresponding projected area.

[0122] Furthermore, this application embodiment does not limit the number of the plurality of first magnets 23 in the magnet 21 or the shape and size relationship between the different first magnets 23. The figure shows the case where the magnet 21 includes four first magnets 23. Optionally, the third surface M3 on the plurality of first magnets 23 may have the same projected area, and similarly, the second surface M2 corresponding to the plurality of first magnets 23 may have the same projected area. Further, the plurality of first magnets 23 may be arranged in a centrally symmetrical manner.

[0123] In some embodiments, such as Figure 3 and Figure 6 As shown, the second magnet 24 includes a fourth surface M4 facing the stator assembly 10 and a fifth surface M5 facing away from the stator assembly 10. In a projection plane perpendicular to the axial direction X, the projected area of ​​the fifth surface M5 is greater than the projected area of ​​the fourth surface M4.

[0124] It should be noted that when the second magnet 24 includes a magnetic body 241 and a second protrusion 252, and the second protrusion 252 completely covers the magnetic body 241, the fifth surface M5 of the second magnet 24 away from the stator assembly 10 is the first surface M1 of the second protrusion 252 away from the magnetic body 241.

[0125] In this embodiment, the shape and size of the second magnet 24 have been adjusted. The projected area of ​​the fifth surface M5 is set to be larger than that of the fourth surface M4. As can be seen from the accompanying drawings, since the fifth surface M5 has a larger projected area than the fourth surface M4, the second magnet 24 can play a stronger guiding role in the magnetic field generated by the first magnet 23 at the second surface M2. This allows for better magnetic circuit closure on the side of the magnet 21 away from the stator assembly 10, thereby further improving the leakage magnetic problem and enhancing the reliability of use.

[0126] In some embodiments, such as Figure 3 and Figure 6 As shown, the second magnet 24 includes a fourth surface M4 facing the stator assembly 10 and a fifth surface M5 facing away from the stator assembly 10. In a projection plane perpendicular to the axial direction X, the projected area of ​​the fifth surface M5 is greater than the projected area of ​​the second surface M2; and / or, the projected area of ​​the third surface M3 is greater than the projected area of ​​the fourth surface M4.

[0127] The third surface M3 and the fourth surface M4 are the surfaces of the first magnet 23 and the second magnet 24 facing the stator assembly 10, respectively. The second surface M2 and the fifth surface M5 are the surfaces of the first magnet 23 and the second magnet 24 facing away from the stator assembly 10, respectively. In the scheme where axially magnetized magnets and circumferentially magnetized magnets are alternately distributed, in addition to the overall size of the magnet 21 affecting the projected area of ​​the axially magnetized magnet facing the stator assembly 10, the projected area of ​​the circumferentially magnetized magnet facing the stator assembly 10 also limits the projected area of ​​the axially magnetized magnet facing the stator assembly 10. Typically, the circumferentially magnetized magnet facing the stator assembly 10 often has the same or similar projected area as the axially magnetized magnet facing the stator assembly 10, and the circumferentially magnetized magnet facing away from the stator assembly 10 often has the same or similar projected area as the axially magnetized magnet facing away from the stator assembly 10.

[0128] In view of this, in addition to adjusting the shape and size of the first magnet 23 so that the projected area of ​​the third surface M3 is greater than the projected area of ​​the fourth surface M4, the embodiments of this application can also adjust the dimensional relationship between the first magnet 23 and the second magnet 24, setting the projected area of ​​the third surface M3 to be greater than the projected area of ​​the fourth surface M4. This design can make the third surface M3 have a larger projected area when the surface size of the magnet 21 facing the stator assembly 10 is determined, thereby helping to further enhance the magnetic flux between the magnet 21 and the stator assembly 10 and improve the overall driving capability of the motor assembly 100.

[0129] Alternatively, in this embodiment, the dimensional relationship between the first magnet 23 and the second magnet 24 can be adjusted so that the projected area of ​​the fifth surface M5 is greater than the projected area of ​​the second surface M2. This design can ensure that the second surface M2 has a smaller projected area and the fifth surface M5 has a larger projected area when the surface size of the magnet 21 on the side away from the stator assembly 10 is determined. This further reduces the magnetic flux of the first magnet 23 on the side away from the stator assembly 10 and improves the magnetic field guiding effect of the second magnet 24 on the side away from the stator assembly 10, thereby improving the magnetic leakage problem of the magnet 21 on the side away from the stator assembly 10.

[0130] In conjunction with the foregoing embodiments, in some optional embodiments, in a projection plane perpendicular to the axial direction X, the projected area of ​​the third surface M3 is greater than the projected area of ​​the second surface M2, the projected area of ​​the fifth surface M5 is greater than the projected area of ​​the second surface M2, and the projected area of ​​the third surface M3 is greater than the projected area of ​​the fourth surface M4.

[0131] With this design, the outer peripheral surface of the magnet 21 can maintain consistency with relevant technologies, such as... Figure 2 The cylindrical surface shown. Specifically, in the projection plane perpendicular to the axial direction X, the projection pattern formed by the third surface M3 of the plurality of first magnets 23 and the fourth surface M4 of the plurality of second magnets 24 coincides with the projection pattern formed by the second surface M2 of the plurality of first magnets 23 and the fifth surface M5 of the plurality of second magnets 24.

[0132] Furthermore, because the dimensions and shapes of the first magnet 23 and the second magnet 24 have been adjusted in this embodiment, the projected area of ​​the third surface M3 is not the same as the projected area of ​​the fourth surface M4. Therefore, compared with related technologies, under the premise of the same cylindrical size, the axially magnetized magnet in this embodiment can have a larger projected area on the side closer to the stator assembly 10, thereby enabling the motor assembly 100 in this embodiment to have stronger driving performance. Moreover, the axially magnetized magnet in this embodiment can have a smaller projected area on the side closer to the stator assembly 10, thereby enabling the motor assembly 100 in this embodiment to have a lower risk of magnetic leakage.

[0133] Therefore, the embodiments of this application can appropriately reduce the size of the magnet 21 in the radial Y direction while maintaining the same driving performance as related technologies, thereby reducing the size of the motor assembly 100 in the radial Y direction. This allows for a smaller surgical incision during surgery, reducing damage to the human body and simplifying the interventional procedure.

[0134] In some embodiments, such as Figure 1 As shown, in the axial direction X, the dimension of the support plate 40 is L1, where L1 ≤ 0.5 mm. Optionally, L1 is one of 0.01 mm, 0.05 mm, 0.1 mm, 0.2 mm, and 0.5 mm.

[0135] In related technologies, the dimension of the support plate 40 in the axial X direction is often not less than 0.5 mm. However, in this embodiment, by adjusting the shape and size of the first magnet 23, the magnetic leakage problem is improved. Based on this, the support plate 40 can only serve to fix the magnet 21 without reducing magnetic leakage. Therefore, the volume of the support plate 40 can be appropriately reduced, so that its dimension L1 in the axial X direction is not greater than 0.5 mm. This reduces the inflexible dimension of the medical fluid pumping device in the axial X direction, reduces damage to human tissues caused by the medical fluid pumping device, and reduces the operational difficulty of the interventional procedure.

[0136] It should be noted that when the support plate 40 is provided with mounting holes 412, because the dimension L1 of the support plate 40 in the axial X direction is relatively small, therefore... Figure 7As shown, the mounting hole 412 can be set to completely penetrate the support plate 40 along the axial direction X, so that the mounting hole 412 has a certain size in the circumferential direction Z, thereby improving the insertion reliability between the mounting hole 412 and the second protrusion 252.

[0137] In some embodiments, the medical fluid pumping device further includes an outflow channel 51 located on one side of the housing 30 along the axial direction X, and the functional component is located within the outflow channel 51.

[0138] In this embodiment, the outflow channel 51 is located at the far end of the housing 30, and the outflow channel 51 is located on the same side of the magnet 21 and the stator assembly 10 in the axial direction X. The outflow channel 51 has a hollow structure and the impeller functional component 52 is accommodated within the outflow channel 51. An outflow window 53 is provided on the side wall of the outflow channel 51. The impeller functional component 52 drives the blood in the outflow channel 51 to flow out through the outflow window 53 to achieve blood circulation.

[0139] Secondly, embodiments of this application provide a motor assembly 100, which is applied to a medical fluid pumping device. The motor assembly 100 includes a housing 30, a stator assembly 10, a rotor assembly 20, and a support plate 40. The stator assembly 10 is disposed within the housing 30. The rotor assembly 20 is at least partially disposed within the housing 30, and the rotor assembly 20 includes a magnet 21, which is spaced apart from the stator assembly 10 in the axial direction X. The support plate 40 is connected and fixed to the magnet 21 in the axial direction X. A first fixing part 25 is provided on the side of the magnet 21 facing the support plate 40, and a second fixing part 41 is provided on the side of the support plate 40 facing the magnet 21. The first fixing part 25 and the second fixing part 41 are interlocked in the axial direction X.

[0140] It should be noted that the motor assembly 100 in this embodiment can have the same technical effect as the motor assembly 100 in the aforementioned medical fluid pumping device. Please refer to the aforementioned description of the effect of the motor assembly 100 in the medical fluid pumping device. This embodiment does not impose any limitations on this. Furthermore, medical fluid pumping devices include not only blood pumping devices but also various forms such as thrombus aspiration devices. Therefore, the motor assembly 100 provided in this embodiment can be applied to blood pumping devices as well as other interventional machines such as thrombus aspiration devices. This embodiment does not impose any limitations on this.

[0141] Thirdly, this application provides a rotor assembly 20 applied to a motor assembly 100. The rotor assembly 20 includes a magnet 21, which is connected to a support plate 40 in the axial direction X of the motor assembly 100. A first fixing part 25 is provided on the side of the magnet 21 facing the support plate 40, and a second fixing part 41 is provided on the side of the support plate 40 facing the magnet 21. The first fixing part 25 and the second fixing part 41 are inserted and engaged in the axial direction X.

[0142] It should be noted that the rotor assembly 20 in this application embodiment can have the same technical effect as the rotor assembly 20 in the aforementioned motor assembly 100. For details, please refer to the description of the effect of the rotor assembly 20 in the aforementioned embodiments. This application embodiment does not limit this.

[0143] The above description is merely a specific implementation of this application. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, modules, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the protection scope of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the protection scope of this application.

Claims

1. A medical fluid pumping device, characterized in that, include: The motor assembly includes a stator assembly, a rotor assembly, a support plate, and a housing. Some structures in the rotor assembly, the support plate, and the stator assembly are all disposed within the housing. The rotor assembly includes a magnet. The support plate is connected and fixed to the magnet along the axial direction of the motor assembly. A functional component is disposed outside the housing, and the rotor assembly is connected to the functional component; The magnet has a first fixing part on the side facing the support plate, and the support plate has a second fixing part on the side facing the magnet. The first fixing part and the second fixing part are inserted and engaged in the axial direction.

2. The medical fluid pumping device according to claim 1, characterized in that, Along the axial direction of the motor assembly, the magnet is located on one side of the stator assembly; or The stator assembly has a cylindrical structure, and the rotor assembly is installed inside the stator assembly.

3. The medical fluid pumping device according to claim 1, characterized in that, In the circumferential direction around the axial direction, the magnet includes a plurality of alternating first magnets and a plurality of second magnets, wherein the magnetization direction of the first magnets is parallel to the axial direction, and the magnetization direction of the second magnets intersects the axial direction; The magnet and the stator assembly are spaced apart in the axial direction, and the support plate is located on the side of the magnet away from the stator assembly.

4. The medical fluid pumping device according to claim 3, characterized in that, The first fixing part includes a groove structure formed by the recess of the first magnet on the side surface facing the support plate, and the second fixing part includes a first protrusion protruding from the side surface of the support plate facing the magnet, the first protrusion being inserted into the groove structure.

5. The medical fluid pumping device according to claim 4, characterized in that, In the direction from the support plate to the magnet, the circumferential dimension of the groove structure gradually increases; and / or, The groove structure gradually increases in size in the radial direction of the motor assembly.

6. The medical fluid pumping device according to claim 4, characterized in that, Within a virtual arc surface parallel to the circumferential direction and passing through the radial center of the first magnet, the first magnet includes a first cross section, and the groove structure has a second cross section, the area ratio of the first cross section to the second cross section being A, where A≥3.

7. The medical fluid pumping device according to claim 3, characterized in that, In the circumferential direction, the second magnet includes a magnetic body corresponding to the first magnet, and a second protrusion protruding from the magnetic body toward the support plate. The first fixing part includes the second protrusion, and the second fixing part includes a mounting hole located in the support plate. At least a portion of the structure of the second protrusion is located in the mounting hole.

8. The medical fluid pumping device according to claim 7, characterized in that, The second protrusion includes a first surface facing away from the magnetic body, the first magnet including a second surface facing the support plate, the area of ​​the first surface being larger than the area of ​​the second surface.

9. The medical fluid pumping device according to claim 4 or 7, characterized in that, The outer circumference of the magnet is cylindrical.

10. The medical fluid pumping device according to claim 3, characterized in that, The first magnet includes a third surface facing the stator assembly and a second surface facing the support plate, wherein the projected area of ​​the third surface is greater than the projected area of ​​the second surface in a projection plane perpendicular to the axial direction.

11. The medical fluid pumping device according to claim 10, characterized in that, The second magnet includes a fourth surface facing the stator assembly and a fifth surface facing away from the stator assembly, wherein the projected area of ​​the fifth surface is larger than the projected area of ​​the fourth surface in a projection plane perpendicular to the axial direction; and / or, The projected area of ​​the fifth surface is greater than the projected area of ​​the second surface; and / or, The projected area of ​​the third surface is greater than the projected area of ​​the fourth surface.

12. The medical fluid pumping device according to claim 10, characterized in that, In the axial direction, the dimension of the support plate is L1, where L1 ≤ 0.5 mm.

13. The medical fluid pumping device according to claim 1, characterized in that, The medical fluid pumping device includes a blood pumping device or a thrombus aspiration device.

14. A motor assembly, characterized in that, The motor assembly is used in a medical fluid pumping device, and the motor assembly includes: case; The stator assembly is disposed within the housing; A rotor assembly, at least partially disposed within a housing, the rotor assembly including a magnet, the magnet being spaced apart from the stator assembly in the axial direction of the motor assembly; A support plate, which is axially connected and fixed to the magnet. The magnet has a first fixing part on the side facing the support plate, and the support plate has a second fixing part on the side facing the magnet. The first fixing part and the second fixing part are inserted and engaged in the axial direction.

15. A rotor assembly, characterized in that, The rotor assembly is applied to the motor assembly. The rotor assembly includes a magnet. The magnet and a support plate are connected axially in the motor assembly. The magnet has a first fixing part on the side facing the support plate, and the support plate has a second fixing part on the side facing the magnet. The first fixing part and the second fixing part are inserted and engaged in the axial direction.

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