Medical pump flow device and medical pump flow system

Abstract

The application relates to the field of medical devices, and discloses a medical pump flow device and a medical pump flow system. The medical pump flow device comprises an impeller, a motor and a balancing assembly. The motor comprises a shell, a body part and an output shaft. The body part is accommodated in the shell. A part of the output shaft is connected with the body part, and another part of the output shaft penetrates through the shell and is connected with the impeller. The balancing assembly comprises a first magnetic part and a second magnetic part which are oppositely arranged along the axial direction of the motor. The first magnetic part is installed at one end of the impeller close to the shell, and the second magnetic part is installed at one end of the shell close to the impeller. The first magnetic part and the second magnetic part are configured to be capable of being magnetically coupled with each other to generate a balancing force for balancing the axial force between the impeller and the shell. The service life of the motor and the stability of the motor operation can be improved.

Description

Technical Field

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

[0002] Medical pumping devices maintain vital functions (such as circulation, respiration, digestion, and excretion) by directing the flow of fluids (e.g., blood, lymph, gas, digestive juices) within cavities (internally or externally). For example, in the interventional field, interventional devices refer to integrated medical device systems that are inserted into the body through natural cavities or minimally invasive incisions for diagnosis, treatment, or auxiliary procedures. Interventional systems can be categorized into cardiovascular interventional, neurointerventional, and oncology interventional systems. Common interventional systems requiring power include thrombus aspiration systems and ventricular assist systems.

[0003] A common power unit uses an electric motor to drive an impeller, thereby transporting blood. The blood exerts an axial reaction force on the impeller, causing the bearings inside the motor to shift, accelerating bearing wear, and thus affecting the motor's lifespan and operational stability. Utility Model Content

[0004] This application provides a medical pumping device and a medical pumping system, which can improve the service life of the motor and the stability of motor operation.

[0005] On one hand, embodiments of this application provide a medical pumping device, including: an impeller, a motor, and a balancing assembly; the motor includes a housing, a body portion, and an output shaft, the body portion being housed within the housing, a portion of the output shaft being connected to the body portion, and another portion penetrating the housing and connected to the impeller; the balancing assembly includes a first magnetic element and a second magnetic element disposed opposite to each other along the motor axial direction, the first magnetic element being mounted on the end of the impeller near the housing, and the second magnetic element being mounted on the end of the housing near the impeller, the first magnetic element and the second magnetic element being configured to be magnetically coupled to each other to generate a balancing force balancing the axial force between the impeller and the housing.

[0006] In some embodiments of this application, the medical pumping device includes a pumping housing, an impeller located inside the pumping housing, the pumping housing being connected to the outer casing, and the pumping housing having a distal window and a proximal window. The distal window is located on the side of the impeller facing away from the motor, and the proximal window is located between the impeller and the main body. The medical pumping device includes two or more operating states. In different operating states, the first magnetic component and the second magnetic component attract each other axially or repel each other axially. The two or more operating states include a working mode in which fluid flows from the proximal window to the distal window and a working mode in which fluid flows from the distal window to the proximal window.

[0007] In some embodiments of this application, the first magnetic element includes a magnet magnetized along the axial direction, and the second magnetic element includes an excitation coil disposed along the axial direction.

[0008] In some embodiments of this application, along the axial direction, the orthographic projection of the first magnetic element lies within the orthographic projection of the second magnetic element.

[0009] In some embodiments of this application, the second magnetic element includes a package and a plurality of sub-coils housed within the package, each sub-coil being arranged axially along the output shaft, and the plurality of sub-coils being arranged side-by-side within the package in cross-section.

[0010] In some embodiments of this application, in the radial orthogonal projection along the motor, the projection area of ​​the first magnetic element is located within the projection area of ​​the impeller.

[0011] In some embodiments of this application, the outer casing includes a casing body and an end cap. The end cap is connected to the end of the casing body near the impeller, and the outer diameter of the end cap tends to taper from the casing body towards the impeller. The smallest section of the outer diameter of the end cap has a mounting groove recessed into the casing body, and the second magnetic component is installed in the mounting groove.

[0012] In some embodiments of this application, the first magnetic element is annular; and / or, the thickness of the first magnetic element ranges from 0.15 mm to 5 mm.

[0013] In some embodiments of this application, the first magnetic element is spaced apart from the output shaft along the radial direction of the motor; and / or, the second magnetic element is spaced apart from the output shaft along the radial direction of the motor.

[0014] In some embodiments of this application, the impeller includes axial flow blades.

[0015] In some embodiments of this application, the main body includes a rotor structure and a stator structure. The rotor structure is connected to the output shaft, and the stator structure is connected to the housing. The stator structure is radially spaced and sleeved on the side of the rotor structure away from the output shaft. The motor also includes a first bearing and a second bearing installed between the housing and the output shaft. Along the axial direction, the first bearing and the second bearing are located on opposite sides of the rotor structure. Alternatively, the main body includes a rotor structure and a stator structure. The rotor structure is connected to the output shaft, and the stator structure is connected to the housing. Along the axial direction of the motor, the rotor structure is spaced and disposed on at least one side of the stator structure. The motor also includes a first bearing and a second bearing installed between the housing and the output shaft. Along the axial direction, the first bearing and the second bearing are located on opposite sides of the main body.

[0016] In some embodiments of this application, the medical pumping device includes an interventional blood pumping device or an interventional thrombus aspiration device.

[0017] On the other hand, embodiments of this application also provide a medical pumping system, including the aforementioned medical pumping device.

[0018] The medical pumping device and system of this application generate a balancing force through the magnetic coupling of the first and second magnetic components. This effectively balances the axial force between the impeller and the housing, reduces bearing wear, ensures the bearing's positioning accuracy on the output shaft, and makes the medical pumping device more stable during rotation, extending its service life. Simultaneously, it improves the device's working efficiency, ensures the stability and reliability of fluid pumping, and the first magnetic component is located as far away from the body as possible from the impeller, reducing the magnetic field influence of the first and second magnetic components on the body. Attached Figure Description

[0019] 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.

[0020] Figure 1 This is a cross-sectional schematic diagram of a medical pump flow device according to some embodiments of this application;

[0021] Figure 2 An example is shown. Figure 1 A magnified view of a portion of region A in the middle;

[0022] Figure 3 This is a schematic diagram of the structure of the pump housing of a medical pumping device according to some embodiments of this application;

[0023] Figure 4 Show Figure 1 A schematic diagram of the structure of the second magnetic component, wherein the dashed lines are used to represent the perspective structure;

[0024] Figure 5 Show Figure 1 A schematic cross-sectional view of the second magnetic component;

[0025] Figure 6 for Figure 1 Schematic diagram of the middle end cap;

[0026] Figure 7 for Figure 1 A schematic diagram of the structure of the first magnetic component.

[0027] Figure label:

[0028] 100, Impeller; 200, Motor; 201, Mounting slot; 210, Housing; 211, End cover; 212, Housing body; 220, Main body; 221, Stator structure; 222, Rotor structure; 230, Output shaft; 240, First bearing; 250, Second bearing;

[0029] 300: Balancing component; 310: First magnetic component; 320: Second magnetic component; 321: Lead wire; 322: Sub-coil; 323: Package;

[0030] 400, Pump housing; 410, Distal window; 420, Proximal window; 500, Sheath; Z, Axial; X, Radial. Detailed Implementation

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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).

[0037] In the description of the embodiments in this application, the technical terms "center," "longitudinal," and "lateral" are used.

[0038] Length, Width, Thickness, Top, Bottom, Front, Back, Left, Right

[0039] "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise"

[0040] The orientation or positional relationship indicated by "axial", "radial", "circumferential", etc., is based on the orientation or positional relationship shown in the accompanying drawings and is only for the purpose of facilitating the description of the embodiments of this application and simplifying the description. It is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the embodiments of this application.

[0041] 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.

[0042] Before detailing the technical solution of this case, let's briefly describe the types of medical pumping devices. In terms of application scenarios, medical pumping devices can be used in interventional procedures, implantation procedures, and extracorporeal working scenarios. Regarding the object being pumped, medical pumping devices are not limited to pumping blood, lymph, gas, or digestive fluids. In terms of function, medical pumping devices can be used for ventricular assist or thrombus aspiration. Therefore, for ease of description, the following will use the application of medical pumping devices in interventional procedures and blood pumping as examples.

[0043] Interventional devices refer to integrated medical equipment systems that are inserted into the body through natural cavities or minimally invasive incisions for diagnosis, treatment, or auxiliary procedures. Interventional systems can be categorized into cardiovascular interventional, neurointerventional, and oncology interventional systems, among which those requiring power include thrombus aspiration systems and ventricular assist systems.

[0044] Specifically, a thrombus aspiration system is a type of interventional medical device used to remove blood clots from blood vessels. It uses mechanical or hydrodynamic methods to extract the thrombus from the blood vessel, restoring vascular patency. A thrombus aspiration system includes an aspiration catheter and a power unit. The power unit generates negative pressure to draw the thrombus through the aspiration catheter, which then removes it from the body.

[0045] A ventricular assist system (VAS) is a medical device that replaces or assists the heart's pumping function, primarily used to treat patients with end-stage heart failure (EF < 35%) or cardiogenic shock. It uses a mechanical device to draw blood from the atria or ventricles, pressurizes it with a power unit, and delivers it to the arterial system, partially or completely replacing the heart's pumping function. A VAS includes a vascular passage with inflow and outflow windows and a power unit (i.e., a blood pump). The power unit generates pumping force, pumping blood in through the inflow window and out through the outflow window.

[0046] Currently, most commonly used power devices in thrombus aspiration systems and ventricular assist systems employ an electric motor to drive an impeller, generating a driving force that draws blood in through the inlet window and out through the outlet window, or vice versa. As the impeller drives the blood, the blood exerts a reaction force on it. This reaction force is transmitted to the motor's internal structure via the motor shaft. Firstly, this reaction force causes axial force on the motor's bearings, accelerating bearing wear and leading to premature bearing failure, thus affecting the motor's lifespan. Secondly, because the motor rotor is mounted on the motor shaft, and the motor shaft is positioned via bearings...

[0047] After the bearing wears down, the positioning and support accuracy of the bearing decreases, which makes it impossible for the air gap between the rotor and stator of the motor to remain stable and consistent. This affects the stable operation of the motor, and consequently affects the working stability of the intervention device, which may lead to obstruction or even shutdown of the intervention device.

[0048] In view of this, the embodiments of this application provide a medical pumping device and a medical pumping system. The magnetic coupling between the first and second magnetic components generates a balancing force, effectively balancing the axial force between the impeller and the housing, reducing bearing wear, ensuring the bearing's positioning accuracy on the output shaft, making the medical pumping device more stable during rotation, and extending the device's service life. Simultaneously, it improves the device's working efficiency, ensures the stability and reliability of fluid pumping, and the first magnetic component is located as far away from the body as possible from the impeller, reducing the magnetic field influence of the first and second magnetic components on the body.

[0049] like Figures 1 to 7 This application provides a medical pumping device, including an impeller 100 and a motor 200. The motor 200 includes a housing 210, a body 220 and an output shaft 230. The body 220 is housed in the housing 210. A portion of the output shaft 230 is connected to the body 220, and another portion passes through the housing 210 and is connected to the impeller 100.

[0050] Impeller 100 is a component with a blade structure that can drive fluid flow through rotation. Its structure and shape are designed according to specific application scenarios and fluid characteristics to achieve efficient fluid pumping.

[0051] For example, the impeller 100 can be an axial flow blade or a centrifugal blade, or other forms of functional components for driving fluid motion.

[0052] The motor 200 is a device that converts electrical energy into mechanical energy. The motor 200 controls the flow direction of the impeller 100 by rotating forward and backward. For example, the motor 200 can be an axial field motor or a radial field motor.

[0053] The motor 200 includes a housing 210, which can serve as an iron core. In this case, the housing 210 is the main carrier of the magnetic circuit of the motor 200, used to guide the magnetic field, reduce magnetic resistance, and improve the efficiency of the motor 200. In one example, the iron core and the housing 210 are integrated. Exemplarily, the housing 210 can be made of laminated silicon steel sheets with high magnetic permeability to enhance the magnetic field and protect the main body 220.

[0054] In another example, the motor 200 includes a housing 210 and an iron core disposed within the housing 210. The material of the housing 210 may be the same as or different from that of the iron core. Exemplarily, the housing 210 may be aluminum alloy, cast iron, engineering plastic, etc.

[0055] The motor 200 also includes a body portion 220, which rotates via electromagnetic induction. Exemplarily, the body portion 220 includes a stator structure 221 and a rotor structure 222. As an example, the stator structure 221 and rotor structure 222 may be arranged sequentially along the axial direction Z of the motor 200 or arranged radially inwards and outwards along the radial direction X of the motor 200.

[0056] The motor 200 also includes an output shaft 230, which transmits the power generated by the main body 220 to the impeller 100, causing the impeller 100 to rotate. For example, one end of the output shaft 230 is fixedly connected to a portion of the main body 220, and the other end passes through the housing 210 and is fixedly connected to the impeller 100. The fixed connection can be achieved through snap-fitting, bonding, welding, keying, riveting, or other methods.

[0057] In this embodiment, the axial direction Z of the motor 200 is parallel to the output shaft 230 of the motor 200, that is, along the length of the shaft (from one end of the shaft to the other). The radial direction X of the motor 200 is perpendicular to the output shaft 230 of the motor 200, that is, the radial direction around the shaft (from the center of the shaft to the outer periphery, or from the outer periphery to the center of the shaft).

[0058] In some embodiments of this application, the body 220 includes a rotor structure 222 and a stator structure 221. The rotor structure 222 is connected to the output shaft 230, and the stator structure 221 is connected to the housing 210. The stator structure 221 is sleeved at intervals along the radial direction X of the motor 200 on the side of the rotor structure 222 away from the output shaft 230.

[0059] For example, the rotor structure 222 may be cylindrical or frustum-shaped. As an example, the rotor structure 222 may include one or more permanent magnets. The rotor structure 222 is radially connected to the output shaft 230.

[0060] Exemplarily, the stator structure 221 may be annular. As an example, the stator structure 221 includes a stator core and windings wound around the outer periphery of the stator core. The stator structure 221 and rotor structure 222 form an air gap along the radial direction X, the air gap having a uniform spacing along the axial direction Z. The stator structure 221 and rotor structure 222 couple to drive the output shaft 230 to rotate, thereby driving the impeller 100 to rotate.

[0061] In some embodiments, the motor 200 further includes a first bearing 240 and a second bearing 250 mounted between the housing 210 and the output shaft 230, with the first bearing 240 and the second bearing 250 located on both sides of the rotor structure 222 along the axial direction Z.

[0062] For example, the first bearing 240 and the second bearing 250 can be bearings with the same structure or different structures. The first bearing 240 or the second bearing 250 can be a rolling bearing, a sliding bearing, etc. As an example, the first bearing 240 is located between the impeller 100 and the body portion 220, and the first bearing 240 can be a deep groove ball bearing. The second bearing 250 is located on the side of the rotor structure 222 opposite to the first bearing 240, and the second bearing 250 can be a bushing.

[0063] In one example, the motor 200 also includes multiple bearing housings, with the first bearing 240 and the second bearing 250 respectively connected to the housing 210 via the bearing housings.

[0064] In one example, the housing 210 includes a housing body 212 and an end cap 211, the end cap 211 being connected to one end of the housing body 212 near the impeller 100. The housing body 212 encloses a receiving cavity in which the first bearing 240, the second bearing 250, and the body portion 220 are received.

[0065] As an example, the end cap 211 can be made of biosafety metal materials such as stainless steel, titanium, and titanium alloys.

[0066] Specifically, the output shaft 230 passes through the first bearing 240, the rotor structure 222, and the second bearing 250. The first bearing 240 and the second bearing 250 provide positioning support for the output shaft 230 within the housing 210 at its axial Z-position and radial X-position. This enables the determination of the position of the rotor structure 222 mounted on the output shaft 230 relative to the stator mechanism. The first bearing 240 and the second bearing 250 help ensure the uniformity of the air gap between the rotor structure 222 and the stator structure 221.

[0067] In some embodiments, the body portion 220 includes a rotor structure 222 and a stator structure 221. The rotor structure 222 is connected to the output shaft 230, and the stator structure 221 is connected to the housing 210. Along the axial direction Z of the motor 200, the rotor structure 222 is spaced apart from at least one side of the stator structure 221. The motor 200 also includes a first bearing 240 and a second bearing 250 installed between the housing 210 and the output shaft 230. Along the axial direction Z, the first bearing 240 and the second bearing 250 are located on both sides of the body portion 220.

[0068] In some embodiments of this application, the medical pumping device includes an impeller 100, a motor 200, and a balancing assembly 300. The balancing assembly 300 includes a first magnetic element 310 and a second magnetic element 320 disposed opposite each other along the Z-axis of the motor 200. The first magnetic element 310 is mounted on one end of the impeller 100 near the housing 210, and the second magnetic element 320 is mounted on one end of the housing 210 near the impeller 100. The first magnetic element 310 and the second magnetic element 320 are configured to be magnetically coupled to each other to generate a balancing force that balances the axial force between the impeller 100 and the housing 210.

[0069] The axial force refers to the force acting between the impeller 100 and the casing 210 along the axial direction Z. The axial force can be the reaction force of the fluid on the impeller 100. The axial force can move the impeller 100 closer to the casing 210 or away from the casing 210 along the axial direction Z.

[0070] For example, the first magnetic component 310 can be a permanent magnet, a soft magnetic component, an electromagnet, etc. The second magnetic component 320 can also be a permanent magnet, a soft magnetic component, an electromagnet, etc. The magnetic coupling between the first magnetic component 310 and the second magnetic component 320 generates a balancing force opposite to the axial force between the impeller 100 and the housing 210, thereby reducing the impact of the axial force on the motor 200. As an example, a portion of the second magnetic component 320 near the first magnetic component 310 is made of a soft magnetic material. For example, the end face of the second magnetic component 320 near the first magnetic component 310 is made of a soft magnetic material.

[0071] For example, the balancing force generated by the magnetic coupling of the first magnetic element 310 and the second magnetic element 320 can be greater than, less than, or equal to the axial force. The magnitude of the balancing force can remain constant or change in real time.

[0072] In the embodiments of this application, by setting a balancing component 300, a balancing force is generated by the magnetic coupling of the first magnetic component 310 and the second magnetic component 320, effectively balancing the axial force between the impeller 100 and the housing 210. This reduces bearing wear, ensures the positioning accuracy of the bearing on the output shaft 230, makes the medical pump device more stable during rotation, and extends the service life of the device. At the same time, it improves the working efficiency of the device, ensures the stability and reliability of fluid pumping, and the first magnetic component 310 is located on the impeller 100 as far away from the body 220 as possible, reducing the magnetic field influence of the first magnetic component 310 and the second magnetic component 320 on the body 220.

[0073] In some embodiments, the first magnetic element 310 is annular. The annular first magnetic element 310 can generate a magnetic field uniformly in the circumferential direction of the output shaft 230, which is beneficial to achieving uniformity and continuity of magnetic coupling.

[0074] In other embodiments, the thickness of the first magnetic element 310 ranges from 0.15 mm to 5 mm. Here, thickness refers to the dimension of the first magnetic element 310 in the axial Z direction.

[0075] A thickness range of 0.15mm to 5mm allows for optimization of the device's structure and performance while ensuring magnetic strength. If the thickness is too thin, insufficient magnetism may result in an inability to generate adequate balancing force; if the thickness is too thick, it will increase the weight and size of the device, potentially damaging blood vessels and hindering miniaturization and interventional procedures.

[0076] In some embodiments of this application, the impeller 100 includes axial flow blades. Axial flow blades cause fluid to flow along the axial Z-direction. Axial flow blades have a high flow coefficient and efficiency, making them suitable for applications requiring large fluid volumes.

[0077] The impeller 100, employing axial-flow blades, improves fluid pumping efficiency, allowing fluid to flow more smoothly through the device. The axial-flow blade design enables the impeller 100 to generate a large axial Z-thrust during rotation, thus achieving efficient fluid delivery. In interventional medical settings, this efficient fluid pumping function better meets patient needs and improves treatment outcomes.

[0078] Furthermore, such as Figure 3As shown, in one embodiment of this application, the medical pumping device includes a pumping housing 400, an impeller 100 located inside the pumping housing 400, the pumping housing 400 being connected to the outer casing 210, and the pumping housing 400 having a distal window 410 and a proximal window 420. The distal window 410 is located on the side of the impeller 100 facing away from the motor 200, and the proximal window 420 is located between the impeller 100 and the main body 220.

[0079] Exemplarily, the pump housing 400 may be tubular, with one end along its length including a mounting port that connects to the housing 210. In some examples, the pump housing 400 may be flexible for easy insertion into the human body. In other examples, a portion of the pump housing 400 has a pre-bent angle for easy maneuvering within blood vessels.

[0080] In one example, the remote window 410 may be located on the side wall of the pump housing 400 or at the end opposite to the mounting port along its length.

[0081] As an example, a proximal window 420 is formed in the side wall of the pump housing 400, and the proximal window 420 communicates with the mounting port.

[0082] In some embodiments, the medical pumping device includes two or more operating states, including an operating mode in which fluid flows from the proximal window 420 to the distal window 410 and an operating mode in which fluid flows from the distal window 410 to the proximal window 420. In different operating states, the first magnetic element 310 and the second magnetic element 320 attract each other or repel each other along the axial direction Z.

[0083] For example, in a ventricular assist device, the pump housing 400 can be used for both left ventricular assist and right ventricular assist. During left ventricular assist, blood flows from the proximal window 420 to the distal window 410, and the blood exerts an axial force on the impeller 100 away from the housing 210. During right ventricular assist, blood flows from the distal window 410 to the proximal window 420, and the fluid exerts an axial force on the impeller 100 closer to the housing 210.

[0084] As an example, in the operating mode where fluid flows from the distal window 410 to the proximal window 420, the first magnetic element 310 and the second magnetic element 320 attract each other along the axial direction Z. In the operating mode where fluid flows from the proximal window 420 to the distal window 410, the first magnetic element 310 and the second magnetic element 320 repel each other along the axial direction Z.

[0085] In this embodiment, the pump housing 400 provides a stable working environment for the impeller 100. Simultaneously, the distal window 410 and proximal window 420 enable the medical pumping device to achieve multiple operating modes. Different operating states can be adjusted according to actual needs, meeting the diverse requirements of different medical intervention scenarios. This improves the adaptability and flexibility of the device.

[0086] In one embodiment, the outer diameter of the end cap 211 of the housing 210 tends to taper from the housing body 212 toward the impeller 100. This allows for the guidance of fluid flowing out from the proximal window 420, facilitating fluid flow out of the pump housing 400 and reducing fluid resistance.

[0087] Specifically, in one embodiment of this application, the first magnetic element 310 includes a magnet magnetized along the axial direction Z, and the second magnetic element 320 includes an excitation coil disposed along the axial direction Z.

[0088] The first magnetic component 310 is magnetized along the axial Z direction, which means that the magnetization direction of the magnet is consistent with the axial Z direction of the motor 200, so that the magnet has stable magnetism and can generate a strong magnetic field in the axial Z direction, which is beneficial to increase the balancing force.

[0089] For example, the first magnetic component 310 can be made of one or more of permanent magnet materials such as neodymium iron boron, samarium cobalt, ferrite, and AlNiCo.

[0090] An excitation coil is a coil that generates a magnetic field by passing an electric current through it. The direction and strength of the magnetic field can be adjusted by controlling the magnitude and direction of the current. An excitation coil positioned along the Z-axis can interact with a magnet magnetized along the Z-axis, achieving magnetic coupling.

[0091] By employing a magnet magnetized along the Z-axis and an excitation coil positioned along the Z-axis as the first magnetic element 310 and the second magnetic element 320, the magnetic coupling method of the balancing assembly 300 becomes more flexible and controllable. By adjusting the current in the excitation coil, the magnitude and direction of the balancing force generated by the magnetic coupling can be precisely controlled, thereby better balancing the axial force between the impeller 100 and the housing 210. This improves the stability and reliability of the device and also facilitates adjustments according to different operating conditions.

[0092] Furthermore, the coil is housed inside the housing 210, which facilitates the arrangement of the coil leads 321 and prevents the rotation of the impeller 100 from affecting the arrangement of the leads 321.

[0093] In some embodiments, the first magnetic element 310 includes a plurality of magnetic blocks, the plurality of magnetic blocks including a first magnetic block magnetized in the axial Z direction and a second magnetic block magnetized in the circumferential direction, the first magnetic block and the second magnetic block are alternately arranged along the circumferential direction of the output shaft 230 to enhance the magnetic field strength of the first magnetic element 310 toward the second magnetic element 320, reduce the magnetic field strength on the opposite side, and increase the coupling magnetic field strength of the first magnetic element 310 and the second magnetic element 320.

[0094] In one example, the first and second magnetic blocks are offset along the Z-axis to reduce the leakage magnetic flux of the first magnetic element 310.

[0095] In some embodiments of this application, in the radial X-projection along the motor 200, the projection area of ​​the first magnetic element 310 is located within the projection area of ​​the impeller 100.

[0096] The first magnetic element 310 does not protrude from the end face of the impeller 100 near the housing 210. In one example, the distance between the end face of the first magnetic element 310 near the housing 210 and the housing 210 is greater than the gap between the end face of the impeller 100 near the housing 210 and the housing 210. In another example, the end face of the first magnetic element 310 near the housing 210 is coplanar with the end face of the impeller 100 near the housing 210.

[0097] In this embodiment, the arrangement that the first magnetic element 310 does not protrude from the impeller 100 can reduce the distance between the first magnetic element 310 and the second magnetic element 320, thereby increasing the coupling magnetic flux.

[0098] In one example, the first magnetic element 310 is embedded in the impeller 100.

[0099] Pre-embedding refers to placing the first magnetic component 310 inside the impeller 100 during the manufacturing process, making it an integral part of the impeller 100. Pre-embedding fixes the relative position of the first magnetic component 310 to the impeller 100, preventing displacement of the first magnetic component 310 during impeller 100 rotation. As an example, the first magnetic component 310 and the impeller 100 are either bonded together using an injection molding process or installed together.

[0100] In one example, the first magnetic element 310 can be completely enclosed in the impeller 100 circumferentially, without contact with the fluid. Furthermore, a portion of the impeller 100 is located between the first magnetic element 310 and the second magnetic element 320. This also reduces the impact of the fluid on the first magnetic element 310.

[0101] In another example, the first magnetic element 310 may be partially exposed to the impeller 100. As an example, one end face of the first magnetic element 310 near the second magnetic element 320 is exposed to the impeller 100, thereby reducing the spacing between the first magnetic element 310 and the second magnetic element 320 and increasing the strength of the coupled magnetic field between the first magnetic element 310 and the second magnetic element 320.

[0102] Embedding the first magnetic component 310 within the impeller 100 strengthens the connection between the first magnetic component 310 and the impeller 100, reducing the risk of loosening or displacement of the first magnetic component 310 due to vibration or other factors. Simultaneously, this design eliminates the need for additional axial Z-dimension space, contributing to a smaller overall device size, improved compactness, and easier control over the inflexible length of the medical pump flow device, thus reducing the difficulty of intervention. Furthermore, the pre-embedding method protects the first magnetic component 310 from external environmental influences, extending its service life.

[0103] In other embodiments of this application, a groove may be provided on the side of the impeller 100 near the end cover 211, and the first magnetic component 310 may be installed in the groove. The first magnetic component 310 may be connected to the impeller 100 by means of bonding, welding, riveting, etc.

[0104] In one embodiment of this application, the outer casing 210 includes a casing body 212 and an end cap 211. The end cap 211 is connected to one end of the casing body 212 near the impeller 100, and the outer diameter of the end cap 211 tends to taper from the casing body 212 toward the impeller 100. The smallest section of the outer diameter of the end cap 211 has a mounting groove 201 recessed toward the casing body 212, and the second magnetic component 320 is mounted in the mounting groove 201.

[0105] The minimum outer diameter segment of the end cap 211 refers to the length range of the end of the end cap 211 facing the shell body 212 from the end closest to the impeller 100. Setting the minimum outer diameter segment with the mounting groove 201 reduces the distance between the second magnetic component 320 and the first magnetic component 310, increasing the strength of the coupled magnetic field. Furthermore, the mounting groove 201 on the end side facilitates installation and maintenance.

[0106] For example, the second magnetic element 320 may be annular, arranged around the circumference of the output shaft 230.

[0107] In one example, the second magnetic component 320 is potted to give it good mechanical, thermal conductivity, and electrical insulation properties. As an example, the second magnetic component 320 can be potted separately and then installed in the mounting groove 201, or the second magnetic component 320 and the end cap 211 can be potted together to form a single unit.

[0108] The mounting slot 201 provides a stable mounting position for the second magnetic component 320, ensuring the accurate relative position between the second magnetic component 320 and the first magnetic component 310, thereby improving the magnetic coupling effect of the balancing assembly 300 and better balancing the axial force between the impeller 100 and the housing 210.

[0109] In some embodiments, the second magnetic element 320 includes a package 323 and a plurality of sub-coils 322 housed within the package 323. Each sub-coil 322 is disposed along the axial direction Z of the output shaft 230. In cross-section, the plurality of sub-coils 322 are arranged side by side within the package.

[0110] For example, sub-coil 322 has an axial Z-field. Each sub-coil 322 has the same structure.

[0111] In one example, multiple sub-coils 322 are placed in a potting mold and set at equal angles along the potting mold. The encapsulation material 323 is poured into the potting mold and cured to form a second magnetic component 320 containing multiple sub-coils 322 within the encapsulation material 323.

[0112] In another example, a receiving cavity is formed at an angle in the annular package 323, and the sub-coil 322 is installed in the receiving cavity to form a second magnetic element 320.

[0113] In the embodiments of this application, multiple sub-coils 322 are distributed along the axial direction Z of the output shaft 230. When coupled with the first magnetic element 310, the magnetic flux of the first magnetic element 310 and the second magnetic element 320 along the axial direction Z is enhanced under the same volume, thereby increasing the balancing force and reducing the radial component of the balancing force generated by the coupling of the first magnetic element 310 and the second magnetic element 320.

[0114] In some embodiments, the outer diameter of the first magnetic element 310 is less than or equal to the outer diameter of the end face of the end cover 211 near the impeller 100, and the inner diameter of the first magnetic element 310 is greater than or equal to the outer diameter of the output shaft 230.

[0115] For example, the outer diameter of the end face of the impeller 100 near the end cover 211 is greater than or equal to the outer diameter of the end face of the end cover 211 near the impeller 100.

[0116] Furthermore, in some embodiments of this application, along the axial direction Z, the orthographic projection of the first magnetic element 310 lies within the orthographic projection of the second magnetic element 320.

[0117] In one example, along the radial direction X of the motor 200, the outer diameter of the first magnetic element 310 is less than or equal to the inner diameter of the mounting groove 201.

[0118] The outer diameter of the first magnetic element 310 refers to the maximum dimension of the first magnetic element 310 in the radial X direction. The inner diameter of the mounting groove 201 refers to the maximum dimension of the mounting groove 201 in the radial X direction.

[0119] When the second magnetic component 320 is a coil, the magnetic field strength on the inner ring surface of the second magnetic component 320 is greater than that on the outer ring surface. Therefore, the effective coupling region between the first magnetic component 310 and the second magnetic component 320 is mainly located near the inner ring surface of the second magnetic component 320. The orthographic projection of the first magnetic component 310 lies within the orthographic projection of the second magnetic component 320, which reduces the overall weight of the medical pumping device while ensuring the coupling strength between the first magnetic component 310 and the second magnetic component 320.

[0120] In one embodiment of this application, the first magnetic element 310 has a gap between it and the output shaft 230 along the radial X of the motor 200.

[0121] In some embodiments, the second magnetic element 320 is spaced apart from the output shaft 230 along the radial X of the motor 200.

[0122] The spacing refers to the distance between the first magnetic element 310 or the second magnetic element 320 and the output shaft 230 in the radial X direction.

[0123] Setting the distance between the first magnetic component 310 or the second magnetic component 320 and the output shaft 230 can prevent mutual interference between them. When the output shaft 230 is made of conductive metal, if the distance between the first magnetic component 310 or the second magnetic component 320 and the output shaft 230 is too close, the output shaft 230 may be magnetized, affecting the magnetic field distribution of the rotor mounted on the output shaft 230, thus impacting the performance of the balancing assembly 300 and the reliability of the motor 200. A suitable distance ensures the normal operation of the device and improves its stability and reliability.

[0124] An embodiment of this application also provides a medical pumping system, including the medical pumping device of the above embodiment.

[0125] In one example, the medical pump flow system includes an infusion device. An infusion channel is provided within the motor 200. A portion of the infusion fluid flows through the infusion channel and the first bearing 240 into the air gap between the rotor structure 222 and the stator structure 221, and then exits the motor 200. Another portion of the infusion fluid achieves pressure balance with the fluid flowing out of the outlet window through the gap between the end cap 211 and the output shaft 230. A gap exists between the second magnetic component 320 and the output shaft 230 to facilitate the outflow of the infusion fluid.

[0126] In one example, the medical pump flow system includes a sheath 500 connected to the side of the motor 200 facing away from the pump housing 400.

[0127] 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 pump device, characterized in that, include: impeller; An electric motor includes a housing, a body portion, and an output shaft. The body portion is housed within the housing. A portion of the output shaft is connected to the body portion, and another portion passes through the housing and is connected to the impeller. The balancing assembly includes a first magnetic element and a second magnetic element disposed opposite to each other along the axial direction of the motor. The first magnetic element is mounted on one end of the impeller near the housing, and the second magnetic element is mounted on one end of the housing near the impeller. The first magnetic element and the second magnetic element are configured to magnetically couple with each other to generate a balancing force that balances the axial forces between the impeller and the housing.

2. The medical pump device according to claim 1, characterized in that, The medical pumping device includes a pumping housing, an impeller located inside the pumping housing, the pumping housing being connected to the outer shell, and the pumping housing having a distal window and a proximal window. The distal window is located on the side of the impeller facing away from the motor, and the proximal window is located between the impeller and the main body. The medical pump device includes two or more operating states. In different operating states, the first magnetic component and the second magnetic component attract each other or repel each other along the axial direction. The two or more operating states include an operating mode in which fluid flows from the proximal window to the distal window and an operating mode in which fluid flows from the distal window to the proximal window.

3. The medical pump device according to claim 1, characterized in that, The first magnetic element includes a magnet magnetized along the axial direction, and the second magnetic element includes an excitation coil disposed along the axial direction.

4. The medical pump device according to claim 3, characterized in that, Along the axial direction, the orthographic projection of the first magnetic element lies within the orthographic projection of the second magnetic element.

5. The medical pump device according to claim 3, characterized in that, The second magnetic component includes a package and a plurality of sub-coils housed within the package. Each sub-coil is arranged along the axial direction of the output shaft, and the plurality of sub-coils are arranged side by side within the package in cross-section.

6. The medical pumping device according to any one of claims 1 to 5, characterized in that, In the radial orthographic projection along the motor, the projection area of ​​the first magnetic element is located within the projection area of ​​the impeller.

7. The medical pumping device according to any one of claims 1 to 5, characterized in that, The outer casing includes a casing body and an end cap. The end cap is connected to one end of the casing body near the impeller, and the outer diameter of the end cap tends to taper from the casing body towards the impeller. The end cap has a mounting groove recessed into the shell body at its smallest outer diameter section, and the second magnetic component is installed in the mounting groove.

8. The medical pump device according to claim 1, characterized in that, The first magnetic element is ring-shaped; And / or, the thickness of the first magnetic element ranges from 0.15 mm to 5 mm.

9. The medical pump device according to claim 8, characterized in that, The first magnetic element has a gap between it and the output shaft along the radial direction of the motor; And / or, the second magnetic element is spaced apart from the output shaft along the radial direction of the motor.

10. The medical pumping device according to any one of claims 1 to 5, characterized in that, The impeller includes axial flow blades.

11. The medical pumping device according to any one of claims 1 to 5, characterized in that, The main body includes a rotor structure and a stator structure. The rotor structure is connected to the output shaft, and the stator structure is connected to the housing. The stator structure is radially spaced on the side of the rotor structure away from the output shaft. The motor also includes a first bearing and a second bearing installed between the housing and the output shaft, with the first bearing and the second bearing located on both sides of the rotor structure along the axial direction. Alternatively, the main body includes a rotor structure and a stator structure, the rotor structure is connected to the output shaft, the stator structure is connected to the housing, and along the axial direction of the motor, the rotor structure is spaced apart on at least one side of the stator structure; The motor also includes a first bearing and a second bearing installed between the housing and the output shaft, with the first bearing and the second bearing located on both sides of the body along the axial direction.

12. The medical pumping device according to any one of claims 1 to 5, characterized in that, The medical pumping device includes an interventional blood pumping device or an interventional thrombus aspiration device.

13. A medical pumping system, characterized in that, The medical pump device includes any one of claims 1 to 12.

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