Motor assembly for an interventional catheter system, motor housing for an interventional catheter system, and interventional catheter system

Abstract

The application relates to the field of medical devices, and discloses a motor assembly of an interventional catheter system, a motor shell and the interventional catheter system. The motor assembly of the interventional catheter system comprises a motor body and a motor shell. The motor shell comprises a wall portion, a flow guide channel arranged in the wall portion and a transmission channel arranged at one end of the wall portion along the axial direction of the motor shell. The wall portion is enclosed to form a cavity. Part of the motor body is accommodated in the cavity. The transmission channel is in communication with the cavity and is used for guiding part of the motor body out of the motor shell. The flow guide channel extends along the axial direction and is used for conveying fluid into the motor shell. The flow guide channel is spirally arranged about the axis of the motor shell. The motor assembly is used to improve the stability of operation.

Description

Technical Field

[0001] This application belongs to the field of medical devices, and in particular relates to a motor assembly, motor housing and interventional catheter system for an interventional catheter system. Background Technology

[0002] Interventional catheter systems are medical devices widely used in cardiology, neurology, and other medical fields to perform various minimally invasive procedures. In interventional catheter systems, the motor assembly plays a crucial role. The main function of the motor assembly is to provide power to drive the mechanical components at the catheter tip, such as the impeller of a pump, thereby driving blood flow from one site to another and improving blood circulation.

[0003] Motor assemblies typically require the introduction of a filling fluid for cooling, lubrication, cleaning, or pressure balancing. Existing filling fluid channels can affect the smoothness of motor assembly operation. Utility Model Content

[0004] This application provides a motor assembly, motor housing, and interventional catheter system for an interventional catheter system, which can reduce the influence of the perfusion fluid channel and improve the stability of the motor assembly operation.

[0005] On one hand, embodiments of this application provide a motor assembly for an interventional catheter system, including a motor body and a motor housing. The motor body has a power output end. The motor housing includes a wall portion, a flow guiding channel disposed within the wall portion, and a transmission channel disposed at one end of the wall portion along the axial direction of the motor housing. The wall portion encloses a chamber, a portion of the motor body is accommodated in the chamber, and the transmission channel communicates with the chamber for guiding a portion of the motor body out of the motor housing. The flow guiding channel extends along the axial direction for conveying fluid into the motor housing, and the flow guiding channel is spirally arranged about the axis of the motor housing.

[0006] In some embodiments, the motor housing is an iron core, and the motor body includes a rotating shaft, a stator structure, and a rotor structure. The stator structure and the rotor structure are both placed in the cavity. The rotor structure is mounted on the rotating shaft, and the stator structure is mounted on the wall. The rotor structure and the stator structure are spaced apart along the radial direction of the motor housing. One end of the rotating shaft extends out of the motor housing and serves as the power output end. Along the axial direction, the stator structure is located between the two ends of the flow guide channel.

[0007] In some embodiments, the flow guiding channel is arranged helically symmetrically about the axis of the motor housing, and the pitch of the flow guiding channel is positively correlated with the outer diameter of the rotor structure and the number of pole pairs of the rotor structure, respectively.

[0008] In some embodiments, the pitch of the flow channel is positively correlated with the product of the outer diameter of the rotor structure and the number of pole pairs of the rotor structure.

[0009] In some embodiments, the pitch of the flow guide channel and the motor body at least satisfy the relationship shown in equation (1); H3=π*D*P*N*K1 equation (1), where H3 is the pitch of the flow guide channel, D is the outer diameter of the rotor structure, P is the number of pole pairs of the rotor structure, N is the number of the flow guide channels and is a positive integer greater than 0, and K1 is a constant and satisfies 0.48≤K1≤1.5.

[0010] In some embodiments, when H1 = H2, the pitch of the guide channel and the motor body satisfy the relationship shown in equation (1); when H1 < H2, the pitch of the guide channel and the motor body satisfy the relationship shown in equations (1) and (2); H3 = K2 * H2 equation (2), where H1 is the length of the rotor structure along the axial direction, H2 is the length of the stator structure along the axial direction, and K2 is a constant and satisfies 0.5 ≤ K2 ≤ 2.

[0011] In some embodiments, the wall portion includes an inner wall and an outer wall, the inner wall enclosing to form the cavity, the outer wall enclosing to form a first receiving cavity, the inner wall being placed within the first receiving cavity, and the inner wall being in at least circumferential contact with the outer wall; at least one of the inner wall and the outer wall is provided with a groove, and the groove is located between the inner wall and the outer wall, the groove forming the flow channel.

[0012] In some embodiments, the wall portion has a first channel and a second channel, one of which is used for fluid input and the other for fluid output; the guide channel connects the first channel to one end of the chamber along the axial direction, and the second channel connects to the other end of the chamber.

[0013] In some embodiments, the stator structure includes a connected stator assembly and a drive line, the stator assembly being disposed within the cavity and mounted on the wall, a portion of the drive line being accommodated within the transmission channel, the drive line being used to transmit power to the stator assembly.

[0014] In some embodiments, the device further includes an impeller and a pumping housing, wherein the pumping housing is disposed on the power output end side, the impeller is placed inside the pumping housing, the impeller is connected to the power output end of the motor body, the pumping housing is connected to the motor housing, and the pumping housing has a pumping window.

[0015] On the other hand, this application embodiment also provides a motor housing for an interventional catheter system, including: a wall portion, a flow channel formed within the wall portion, and a transmission channel disposed at one end of the wall portion along the axial direction of the motor housing, the wall portion enclosing to form a chamber, and the transmission channel communicating with the chamber; wherein, the flow channel extends along the axial direction for conveying fluid into the motor housing, and the flow channel is spirally arranged about the axis of the motor housing.

[0016] In another aspect, embodiments of this application also provide an interventional catheter system, including an infusion device, a sheath, an aspiration housing, and a motor assembly of the aforementioned interventional catheter system. The aspiration housing is connected to the distal end of the motor assembly, and the infusion device is connected to the proximal end of the motor assembly via the sheath. The sheath communicates with the flow channel for introducing fluid from the infusion device into the flow channel.

[0017] The motor assembly, motor housing, and interventional catheter system of this application embodiment achieve fluid delivery into the motor housing by setting a flow channel in the wall of the motor housing, reducing the influence of the flow channel on the outer diameter of the motor housing, and arranging the flow channel spirally about the axis of the motor housing, thereby improving the uniformity of the magnetic field distribution of the motor assembly along the circumference, reducing the influence of the flow channel on the cogging torque of the motor assembly, and improving the operational stability of the motor assembly. Attached Figure Description

[0018] 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.

[0019] Figure 1 This is a cross-sectional view of the motor assembly of an interventional catheter system according to some embodiments of this application;

[0020] Figure 2 for Figure 1 A schematic diagram of a type of motor housing;

[0021] Figure 3 This is another cross-sectional view of the motor assembly of an interventional catheter system according to some embodiments of this application;

[0022] Figure 4 This is yet another cross-sectional view of the motor assembly of an interventional catheter system according to some embodiments of this application;

[0023] Figure 5 Another cross-sectional view of the motor assembly of an interventional catheter system according to some embodiments of this application;

[0024] Figure 6This is a schematic diagram of the overall structure of the motor assembly of the interventional catheter system according to some embodiments of this application;

[0025] Figure 7 for Figure 6 A sectional view;

[0026] Figure 8 This is a schematic diagram of the interventional catheter system according to an embodiment of this application.

[0027] Figure label:

[0028] 10. Motor assembly; 11. Suction housing; 12. Sheath; 13. Filling device; 14. Pumping mechanism; 15. Liquid storage mechanism;

[0029] 100. Motor body; 110. Shaft; 120. Stator structure; 121. Stator assembly; 122. Drive line; 130. Rotor structure;

[0030] 200, Motor housing; 201, Chamber; 202, First receiving cavity; 210, Wall; 210a, First wall section; 210b, Second wall section; 210c, Third wall section; 211, Inner wall; 212, Outer wall; 220, Guide channel; 230, Transmission channel; 240, First channel; 250, Second channel;

[0031] 300, Pump casing; 301, Pumping window; 310, Impeller; X, Axial direction; Y, Radial direction. Detailed Implementation

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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).

[0038] In the description of the embodiments in this application, the technical terms "center," "longitudinal," and "lateral" are used.

[0039] Length, Width, Thickness, Top, Bottom, Front, Back, Left, Right

[0040] "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise"

[0041] 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.

[0042] 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.

[0043] Interventional catheter systems are medical devices widely used in cardiology, neurology, and other medical fields to perform a variety of minimally invasive procedures. These systems typically consist of a long, thin catheter that reaches the target treatment area through a blood vessel or the body's natural pathway. The catheter tip may be equipped with various instruments, such as stents, balloons, sensors, or micromotors, to perform specific procedures, such as drug delivery, vasodilation, tissue resection, image acquisition, or circulatory support.

[0044] In interventional catheter systems, the motor assembly plays a crucial role, especially in applications such as cardiac assist pumps, intraaortic balloon pumps (IABP), and left ventricular assist devices (LVADs). The main function of the motor assembly is to provide power to drive the mechanical components at the catheter tip, such as the impeller of the pump, thereby driving blood flow from one site to another and improving blood circulation.

[0045] However, during operation of the motor assembly within the catheter system, heat is generated, bearing wear, and friction between the shaft and surrounding components can produce microparticles. To prevent these microparticles from entering the bloodstream, and also to cool and lubricate the motor, perfusion fluid is introduced into the motor assembly. The perfusion fluid is typically saline, glucose solution, or other harmless fluids that flow through perfusion channels to the motor assembly. It carries away the heat generated during motor operation, preventing damage from overheating. The perfusion fluid also reduces direct contact between rotating parts of the motor, lowering friction and ensuring smooth operation. Furthermore, it flushes away microparticles generated during motor operation, preventing them from entering the bloodstream and reducing the risk of complications. The pressure of the perfusion fluid helps balance the pressure difference inside and outside the motor, especially under high-pressure conditions such as when the heart is pumping blood, preventing blood backflow or entry into the motor and interfering with its normal operation. The functions of the perfusion fluid include carrying away heat through conduction and convection as it flows through or around the motor, maintaining its operation within a safe temperature range and ensuring the stability and safety of the surgical procedure. The perfusion fluid forms a lubricating film in the motor gaps, reducing direct contact and friction between components, extending motor lifespan, and lowering noise and energy loss caused by friction. The perfusion fluid flushes away tissue debris, blood, or metabolic products around the motor, while preventing external microorganisms from entering the motor, avoiding postoperative infection and ensuring patient safety. Some perfusion fluids may carry medications, contrast agents, etc., which are delivered to the lesion site by the motor-driven fluid flow, achieving dual functions of treatment and monitoring (e.g., performing ultrasound imaging while perfusing medication).

[0046] During motor assembly operation, its housing (especially for motors with built-in permanent magnets) is not merely a simple physical support structure; it also participates in the formation of the motor's magnetic field circuit. In some applications, the structure forming the injection fluid channel may affect the thickness distribution of the motor housing, thereby affecting the magnetic reluctance and causing uneven magnetic field distribution in the motor. This can lead to unstable phenomena such as abnormal vibration and noise during motor assembly operation.

[0047] In view of this, embodiments of this application provide a motor assembly for an interventional catheter system. By forming a flow channel within the wall of the motor housing to transport fluid, such as perfusion fluid, and by arranging the flow channel spirally symmetrically about the axis of the motor housing, the uniformity of the magnetic field distribution along the circumferential direction of the motor assembly is improved, the influence of the flow channel on the cogging torque of the motor assembly is reduced, and the operational stability of the motor assembly is improved.

[0048] The motor assembly of the interventional catheter system disclosed in this application can be applied to interventional catheter systems such as percutaneous cardiac catheter pumps (pVAD), thrombus aspiration systems, intra-aortic balloon pumps (IABP), and ventricular assist devices (VAD). The following description uses a ventricular assist device (VAD) as an example to illustrate the motor assembly.

[0049] Figure 1 This is a cross-sectional view of the motor assembly of an interventional catheter system according to some embodiments of this application;

[0050] Figure 2 for Figure 1 A schematic diagram of a motor housing. The fluid mentioned below can be a liquid or a gas.

[0051] like Figure 1 and Figure 2 As shown, some embodiments of this application provide a motor assembly 10 for an interventional catheter system, including a motor body 100 and a motor housing 200. The motor body 100 is used to output power. The motor housing 200 includes a wall portion 210, a flow channel 220 disposed within the wall portion 210, and a transmission channel 230 disposed at one end of the wall portion 210 along the axial direction X of the motor housing 200. The wall portion 210 encloses to form a chamber 201. A portion of the motor body 100 is accommodated in the chamber 201. The transmission channel 230 communicates with the chamber 201 and is used to guide a portion of the motor body 100 out of the motor housing 200. The flow channel 220 extends along the axial direction X and is used to deliver fluid into the motor housing 200. The flow channel 220 is spirally arranged about the axis of the motor housing 200.

[0052] In some embodiments of this application, the motor housing 200 is an iron core, wherein the iron core is made of silicon steel sheets.

[0053] For example, the motor body 100 can adopt a DC structure or an AC structure. This application does not make a specific limitation on this. The filling of components such as sterile water, physiological saline, and balanced salt solution are all within the protection scope of this application.

[0054] In one example, the motor body 100 generates output power by connecting to a power source. In another example, the motor body 100 transmits power through a drive end, which can be a shaft.

[0055] The motor housing 200 extends along its own axial direction X and is disposed outside the motor body 100, thereby protecting the motor body 100. Exemplarily, the motor housing 200 may be made of one or a combination of cast iron, aluminum alloy, stainless steel, and composite materials. As an example, the motor housing 200 is cylindrical.

[0056] The motor housing 200 includes a wall portion 210, which, by way of example, can be a single-layer structure or a multi-layer structure.

[0057] The wall portion 210 encloses and forms a cavity 201 for accommodating the motor body 100. Exemplarily, a portion of the motor body 100 is located inside the cavity 201, and a portion extends outside the cavity 201 to transmit power to the outside of the motor housing 200.

[0058] The motor housing 200 includes a flow channel 220, which is isolated from the chamber 201 and the external environment by a wall 210. For example, the flow channel 220 may be a groove structure or a pipe formed by a groove or protrusion formed on the thickness of the wall 210.

[0059] The extension of the flow channel 220 along the axial direction X means that the length of the flow channel 220 tends to increase along the axial direction X. Exemplarily, the flow channel 220 may include one or more, and in one example, multiple flow channels 220 are arranged in parallel.

[0060] The centerline or inner wall profile of the flow channel 220 is spiral-shaped, extending around the axis of the motor housing 200 to form a structure similar to a "spring" or "threaded tube".

[0061] In one example, the flow channel 220 includes a first flow guide end and a second flow guide end along its own length direction. Along the axial direction X, the first and second flow guide ends may be opposite or offset. In some implementations, the orthographic projection of the first flow guide end along the axial direction onto a first projection plane coincides with the orthographic projection of the second flow guide end along the axial direction onto the first projection plane. The first projection plane is a plane perpendicular to the axial direction. As an example, fluid can flow from the first flow guide end to the second flow guide end, or from the second flow guide end to the first flow guide end.

[0062] In another example, the width and depth of the flow channel 220 remain consistent along its length.

[0063] In some examples, the length of the flow channel 220 along the axial direction X may be equal to or less than the length of the wall portion 210. Here, the length along the axial direction X refers to the dimension or distance along the axial direction of the motor assembly 10.

[0064] The motor housing 200 includes a transmission channel 230 disposed at one end of the wall portion 210 for extending a portion of the motor body 100 out of the chamber 201. The transmission channel 230 facilitates the establishment of a physical connection between the motor body 100 and the outside of the chamber 201. Exemplarily, the transmission channel 230 may accommodate a power cord or insulation layer of the motor body 100.

[0065] In one example, the transmission channel 230 is a hole structure opened along the axial direction X for leading out the power line of the motor body 100 so that the power line can be connected to the power source.

[0066] In one example, the transmission channel 230 and the power output are located on opposite sides of the chamber.

[0067] By providing a flow channel 220 in the wall 210 of the motor housing 200, fluid is transported into the motor housing 200, reducing the influence of the flow channel 220 on the outer diameter of the motor housing 200. The flow channel 220 is spirally arranged about the axis of the motor housing 200, thereby improving the uniformity of the magnetic field distribution of the motor assembly 10 in the circumferential direction, reducing the influence of the flow channel 220 on the cogging torque of the motor assembly 10, and improving the smoothness of the operation of the motor assembly 10.

[0068] Figure 3 This is another cross-sectional view of the motor assembly 10 of the interventional catheter system according to some embodiments of this application.

[0069] In one optional embodiment of this application, the motor housing 200 serves as the iron core, and the motor body 100 includes a rotating shaft 110, a stator structure 120, and a rotor structure 130. The stator structure 120 and the rotor structure 130 are both located within the chamber 201. The rotor structure 130 is mounted on the rotating shaft 110, and the stator structure 120 is mounted on the wall 210. The rotor structure 130 and the stator structure 120 are spaced apart along the radial direction Y of the motor housing 200. Along the axial direction X, the stator structure 120 is located between the two ends of the flow channel 220.

[0070] The stator structure 120 is responsible for generating a magnetic field to enable the rotor to rotate. Exemplarily, the stator structure 120 can be a slotless hollow cup structure, a slotted wound structure, or a disc coil structure. It is understood that the above stator structures are only partial examples of specific implementations, and other forms of stator structures are also within the scope of protection of this application, provided that structural and functional requirements are met.

[0071] Specifically, along the axial direction X, the flow channel 220 covers the stator structure 120.

[0072] In one example, the magnetic field of the electromagnetic stator structure 120 is generated by energizing the windings. The windings can be made of copper wire or braided multi-strand copper wire, or aluminum wire. The windings are wound concentrically or in laps around the stator core, which can be made of stacked silicon steel sheets to reduce eddy current effects. As an example, the electromagnetic stator can be mounted to the wall 210 of the motor housing 200 by means of screws, fasteners, clips, or adhesives, forming a fixed part of the motor.

[0073] For example, the rotor structure 130 may be a permanent magnet rotor structure 130 or an electromagnetic rotor structure 130.

[0074] In one example, the stator structure 120 includes windings formed by winding copper or aluminum wire. In an AC motor, the windings are formed in recesses in the iron core and can operate without an external power supply.

[0075] For example, a portion of the shaft 110 is located in the chamber 201, and another portion extends out of the motor housing 200. As an example, the distal end of the shaft 110 extends out of the chamber and is connected to the impeller 310 to drive the impeller 310 to rotate.

[0076] In one example, the shaft 110 and the rotor structure 130 are installed together by means of key connection, interference fit connection, threaded connection, welding, bonding, etc.

[0077] In another example, the shaft 110 is rotatably connected to the wall 210 via bearings. As an example, two bearings are respectively provided at both ends of the chamber 201 along the axial direction X and connected to the shaft 110. Fluid in the flow channel 220 can enter the chamber 201 through one bearing and then flow out of the chamber 201 through the other bearing.

[0078] In one example, rotor structure 130 is located between two bearings.

[0079] For example, the stator structure 120 and the rotor structure 130 may be entirely placed within the chamber 201 or partially contained within the chamber 201.

[0080] In some examples, the stator structure 120 and the wall portion 210 can be fixed to the wall portion 210 by mechanical fastening or by adhesive, ensuring stability and positioning accuracy during motor operation. As examples, mechanical fastening can include bolted connections, snap-fits, overlaps, welding, clamping, adhesive bonding, etc.

[0081] For example, in the radial Y direction of the motor housing 200, the spacing between the stator structure 120 and the rotor structure 130 is selected to ensure sufficient electromagnetic coupling while preventing contact between the rotor and the stator to avoid friction and wear.

[0082] In one example, the stator structure 120 and the rotor structure 130 are spaced equally along the axial direction X everywhere.

[0083] The stator structure 120 is located between the two ends of the flow channel 220, meaning that the stator structure 120 is positioned relative to the flow channel 220 within the motor housing 200, between its starting end and ending end in the axial direction X.

[0084] For example, the orthographic projection of the stator structure 120 along the radial direction Y onto the second projection plane is placed within the orthographic projection of the guide channel 220 along the radial direction Y onto the second projection plane. The second projection plane is a plane perpendicular to the radial direction. In some implementations, the second projection plane passes through the centerline of the rotation axis.

[0085] In the embodiments of this application, the stator structure 120 is located between the two ends of the flow channel 220, so that the flow channel 220 uniformly covers the magnetic field range along the circumferential and axial directions X, thereby making the influence of the flow channel 220 on the magnetic field more uniform and making the motor assembly 10 run more smoothly.

[0086] In some specific embodiments of this application, the flow channel 220 is arranged helically symmetrically about the axis of the motor housing 200, and the pitch of the flow channel 220 is positively correlated with the outer diameter of the rotor structure 130 and the number of pole pairs of the rotor structure 130, respectively.

[0087] The spiral symmetrical arrangement of the flow channel 220 about the axis of the motor housing 200 refers to the spiral repeating structure of the flow channel 220 along the axis of the motor housing 200. Specifically, starting from any point in the spiral symmetrical flow channel 220, after rotating a specific angle along a predetermined spiral path and moving a certain distance in parallel, the same structural layout will be encountered again.

[0088] The pitch of the flow guide channel 220 refers to the distance between two adjacent points of the same phase along the axial X direction. The pitch of the flow guide channel 220 reflects the tightness of the flow guide channel 220 along the axial X direction. For example, a smaller pitch means a tighter spiral and a longer fluid path.

[0089] For example, the pitch of the flow channel 220 is positively correlated with the outer diameter of the rotor structure 130 and the number of pole pairs of the rotor structure 130, respectively, by a direct proportional relationship, a linear relationship, a nonlinear relationship, or a threshold relationship. The outer diameter of the rotor structure 130 refers to the diameter corresponding to the outermost circumference of the rotor structure 130.

[0090] The pitch of the flow channel 220 is positively correlated with the outer diameter of the rotor structure 130: the smaller the outer diameter of the rotor structure 130, the smaller the pitch of the flow channel 220; conversely, the larger the outer diameter of the rotor, the larger the pitch of the flow channel 220.

[0091] Specifically, in the spatial distribution of the magnetic field, the pitch of the flow channel 220 needs to be adjusted to accommodate the circumferential distance between the n and s poles (i.e., half the circumference of the rotor structure) in order to reduce cogging torque. Furthermore, the smaller outer diameter of the rotor structure 130 compresses the radial dimension of the motor assembly 10, adapting to miniaturization and integration scenarios. A smaller pitch in the flow channel 220 may increase the fluid coverage within the motor housing 200, resulting in better heat dissipation. Conversely, a larger rotor outer diameter means a larger motor volume and diameter, and the flow path of the fluid in the flow channel 220 within the motor housing 200 will correspondingly lengthen. To ensure that the fluid flows uniformly and effectively across the entire motor housing 200 and avoids fluid stagnation or eddies in a small space, the pitch of the flow channel 220 needs to be increased to accommodate a longer flow path and a larger flow area, allowing the fluid to form a more uniform coverage and flow across the entire motor housing 200.

[0092] The pitch of the flow guide channel 220 is positively correlated with the number of pole pairs in the rotor structure 130. The more pole pairs there are, the larger the pitch of the flow guide channel 220 becomes. The number of pole pairs refers to the number of N and S pole pairs in the motor assembly 10.

[0093] Specifically, the number of pole pairs of the rotor affects the magnetic field distribution characteristics of the motor assembly 10. A higher number of pole pairs results in a more complex rotating magnetic field for the motor assembly 10, which also means more magnetic poles are formed on the rotor structure 130. When the number of pole pairs changes, the electromagnetic characteristics of the motor assembly 10 change, generating stronger cogging torque. To balance the cogging torque and ensure smooth and efficient motor operation, the pitch of the guide channel 220 also needs to be adjusted appropriately. Adjusting the pitch can change the size proportion of the guide channel 220 in the axial direction X, thereby reducing the cogging torque.

[0094] In some alternative embodiments of this application, the pitch of the flow channel 220 is positively correlated with the product of the outer diameter of the rotor structure 130 and the number of pole pairs of the rotor structure 130.

[0095] In one example, as the outer diameter of rotor structure 130 increases and the number of pole pairs of rotor structure 130 also increases, the pitch of guide channel 220 increases.

[0096] In another example, when the outer diameter of rotor structure 130 increases, the number of pole pairs of rotor structure 130 decreases, and the product of the outer diameter of rotor structure 130 and the number of pole pairs of rotor structure 130 increases, the pitch of guide channel 220 increases.

[0097] In another example, the pitch of the flow channel 220 increases when the outer diameter of the rotor structure 130 decreases, the number of pole pairs of the rotor structure 130 increases, and the product of the outer diameter of the rotor structure 130 and the number of pole pairs of the rotor structure 130 increases.

[0098] Specifically, in one embodiment of this application, the pitch of the guide channel 220 and the motor body 100 at least satisfy the relationship shown in equation (1).

[0099] H3=π*D*P*N*K1 Equation (1)

[0100] Where H3 is the pitch of the flow guide channel 220, D is the outer diameter of the rotor structure 130, P is the number of pole pairs of the rotor structure 130, N is the number of flow guide channels 220 and is a positive integer greater than 0, and K1 is a constant and satisfies 0.48≤K1≤1.5.

[0101] For example, the pitch of the flow channel 220 can be calculated solely by relation (1), or it can be determined by relation (1) and other conditions.

[0102] As an example, K1 is a range consisting of one or two of the following: 0.48, 0.5, 0.8, 0.84, 0.9, 0.95, 1, 1.21, 1.3, 1.43, and 1.5.

[0103] In another example of this application, the flow channel 220 is a groove with a depth of 0.05 mm to 0.5 mm.

[0104] In one example, D = 3mm, P = 1, N = 2, 0.5 ≤ K1 ≤ 1.5, H3 = 3 * 1 * 2 * K1π = 6πK1, 3πmm ≤ H3 ≤ 9πmm.

[0105] In the embodiments of this application, the pitch of the guide channel 220 calculated by (1) is made so that the guide channel 220 is within a suitable range of the cogging torque of the motor assembly 10, thereby reducing the influence of the guide channel 220 on the magnetic field of the motor assembly 10 and improving the stability of the operation of the motor assembly 10.

[0106] Furthermore, in other embodiments of this application, when H1 = H2, the pitch of the guide channel 220 and the motor body 100 satisfy the relationship shown in equation (1). When H1 < H2, the pitch of the guide channel 220 and the motor body 100 satisfy the relationships shown in equations (1) and (2).

[0107] H3 = K2 * H2 Equation (2)

[0108] Where H1 is the length of rotor structure 130 along the axial direction X, H2 is the length of stator structure 120 along the axial direction X, and K2 is a constant that satisfies 0.5≤K2≤2.

[0109] As an example, K2 is a range consisting of one or two of the following: 0.5, 0.67, 0.8, 1, 1.1, 1.3, and 1.5.

[0110] H1 = H2 means that in the second projection plane along the radial direction Y, the rotor structure 130 completely overlaps the stator structure 120 along the axial direction.

[0111] H1 < H2 means that in the second projection plane along the radial direction Y of the stator structure 120 and the rotor structure 130, the rotor structure 130 is placed inside the stator structure 120, and both ends of the stator structure 120 extend beyond the rotor structure 130. In one example, in the second projection plane, the two ends of the stator structure 120 extend beyond the rotor structure 130 by the same length.

[0112] The stator structure 120 being longer than the rotor structure 130 expands the effective magnetic field range, ensuring that the magnetic field generated by the rotor structure 130 is fully cut by the coils and reducing magnetic leakage. For example, by increasing the effective conductor length of the stator structure 120, the electromagnetic force can be enhanced under the same current, thereby increasing the motor torque output.

[0113] In the aforementioned motor assembly, the stator structure 120 extending beyond the rotor structure 130 and other adjacent magnetic conductive structures, under the influence of current, form an interfering magnetic field on the outer sides of both ends of the rotor structure 130, disrupting the original magnetic field symmetry and potentially causing cogging torque fluctuations, manifested as periodic pulsations in torque output. By combining the relationships (1) and (2), the pitch of the current guiding channel 220 is determined, thereby balancing the instability of the motor assembly 10 caused by the magnetic field symmetry and improving the smoothness of the motor assembly 10's operation.

[0114] Figure 4 This is another cross-sectional view of the motor assembly 10 of the interventional catheter system according to some embodiments of this application.

[0115] Furthermore, such as Figures 1 to 4As shown, in an optional embodiment of this application, the wall portion 210 includes an inner wall 211 and an outer wall 212. The inner wall 211 encloses a cavity 201, and the outer wall 212 encloses a first receiving cavity 202. The inner wall 211 is placed inside the first receiving cavity 202, and the inner wall 211 and the outer wall 212 are in at least circumferential contact. The flow channel 220 includes a groove, which is formed in at least one of the inner wall 211 and the outer wall 212, and is located between the inner wall 211 and the outer wall 212.

[0116] For example, the inner wall 211 and the outer wall 212 may be cylindrical in the circumferential direction and fitted together. In one example, the outer circumferential surface of the inner wall 211 and the inner circumferential surface of the outer wall 212 are fitted together without gaps within the tolerance range. Fitting means that areas other than the groove are fitted together, not that the entire inner and outer circumferential surfaces are completely fitted together.

[0117] In one example, the inner wall 211 includes a circumferential surface and an end surface, and the outer wall 212 includes a circumferential surface and an end surface, with the circumferential surface of the inner wall 211 in contact with the circumferential surface of the outer wall 212. Specifically, the outer circumferential surface of the inner wall 211 is in contact with the inner circumferential surface of the outer wall 212.

[0118] In some examples, the inner wall 211 and the outer wall 212 can be connected by welding, bonding, interference fit, or other methods.

[0119] In some examples, the length of the first receiving cavity 202 along the axial direction X may be greater than or equal to the length of the inner wall 211. As an example, the length of the first receiving cavity 202 along the circumferential direction is greater than that of the inner wall 211, and the flow channel 220 communicates with the chamber 201 through the first receiving cavity 202 and with the side opposite to the chamber 201 along the axial direction X.

[0120] For example, the flow channel 220 includes a groove formed by an indentation of the inner wall 211 and / or outer wall 212 along the radial direction Y of the motor housing 200. The radial direction Y of the motor housing 200 refers to the radial direction in a plane perpendicular to the motor axis. The radial direction Y is perpendicular to the circumferential direction.

[0121] In some examples, the flow channel 220 is disposed on the outer peripheral surface of the inner wall 211, or on the inner peripheral surface of the outer wall 212, or a portion of the flow channel 220 is disposed on the outer peripheral surface of the inner wall 211 and another portion is disposed on the inner peripheral surface of the outer wall 212.

[0122] In the embodiments of this application, the double-wall structure of the motor housing 200 facilitates the processing of the flow channel 220, reduces the processing difficulty, and also facilitates the control of the accuracy of the flow channel 220.

[0123] Figure 5 This is another cross-sectional view of the motor assembly 10 of the interventional catheter system according to some embodiments of this application.

[0124] like Figures 1 to 5 As shown, in some optional embodiments of this application, the wall portion 210 is provided with a first channel 240 and a second channel 250, one of the first channel 240 and the second channel 250 is used for fluid input and the other is used for fluid output; the guide channel 220 connects the first channel 240 with one end of the chamber 201 along the axial direction X, and the second channel 250 connects with the other end of the chamber 201.

[0125] For example, the first channel 240 can be a hole structure or a pipe structure. In one example, the first channel 240 includes one or more segments that are continuously arranged along its own length direction.

[0126] In one example, the first channel 240 can be one or more. As an example, multiple first channels 240 are evenly distributed circumferentially along the motor housing 200. Here, circumferential refers to the tangential direction around the axis of the motor assembly 10. This allows the fluid used as the filling liquid to be quickly injected into the interior of the motor assembly, improving heat dissipation efficiency.

[0127] For example, the second channel 250 can be a hole structure or a pipe structure. In one example, the second channel 250 extends along the axial direction X.

[0128] In some examples, the first channel 240 and the second channel 250 may be located at one or both ends of the wall portion 210. In some embodiments, the first channel 240 and the second channel 250 are located at the distal end of the wall portion 210, which is a more reasonable layout and makes it easier to control the intervention size of the motor assembly.

[0129] As an example, the wall portion 210 includes a first wall segment 210a, a second wall segment 210b, and a third wall segment 210c distributed along the axial direction X. The first wall segment 210a, the second wall segment 210b, and the third wall segment 210c enclose a cavity 201. Along the axial direction X, the cavity 201 is located within the second wall segment 210b, and the length of the second wall segment 210b is the same as the length of the cavity 201. The first channel 240 and the second channel 250 can be formed in the third wall segment 210c. The third wall segment 210c faces away from the output end of the motor body 100. Exemplarily, the protruding end of the rotating shaft 110 is the output end of the motor body 100. The first wall segment 210a can be a distal end cap, the second wall segment 210b can be an iron core, and the third wall segment 210c can be a proximal end cap.

[0130] In one example, the first channel 240 is used for fluid input, and the second channel 250 is used for fluid output. The fluid flows out of the second channel 250 via the first channel 240, the guide channel 220, and the chamber 201. The dashed arrows in the figure indicate the direction of fluid flow. By using the first channel as the input end, the fluid bypasses the bearing structure, ensuring that the fluid flowing out of the shaft hole is uncontaminated, thus reducing the chance of blood contamination.

[0131] In the embodiments of this application, by setting the first channel 240 and the second channel 250, the fluid injected into the motor assembly 10 is made to circulate, so as to remove particulate matter from the motor assembly 10.

[0132] In one embodiment of this application, a portion of the first receiving cavity 202 is formed in the first wall segment 210a. The first wall segment 210a also includes a shaft hole through which the rotating shaft 110 of the motor body 100 extends out of the wall segment 210. There is a gap between the shaft hole and the rotating shaft 110. Fluid entering through the first channel 240 flows into the first receiving cavity 202 of the first wall segment 210a through the guide channel 220, causing a portion of the fluid to enter the chamber 201 and a portion to flow out from the gap between the shaft hole and the rotating shaft 110, thereby balancing the fluid pressure outside the first receiving cavity 202.

[0133] In one example, the inner circumferential surface of the first wall section 210a is tapered, with a tendency to gradually expand from the shaft hole toward the chamber 201. The tapered inner circumferential surface of the first wall section 210a facilitates the flow of fluid from the guide channel 220 into the shaft hole, balancing the fluid pressure outside the first receiving cavity 202.

[0134] In another example, the outer peripheral surface of the first wall segment 210a is conical, with a tendency to gradually expand from the axial bore towards the chamber 201. In the working state, the conical streamlined surface serves as a blood flow surface. The conical shape of the outer peripheral surface of the first wall segment 210a helps reduce the difficulty of interventional catheter systems in vessels such as the femoral artery, axillary artery, or carotid artery, reducing friction and damage to the vessel wall, and improving the safety and comfort of the interventional procedure.

[0135] In one embodiment of this application, the stator structure 120 includes a connected stator assembly 121 and a drive line 122. The stator assembly 121 is placed in the cavity 201 and mounted on the wall 210, and a portion of the drive line 122 is accommodated in the transmission channel 230.

[0136] For example, the transmission channel 230 can be one or more channels, such as three parallel and independent channels.

[0137] In some examples, the stator assembly 121 can be a coil structure, and the drive line 122 is a power line connected to the coil structure. As an example, the rotor structure 130 is a magnet.

[0138] In another example, a sealing structure can be provided between the transmission channel 230 and the chamber 201 to allow the drive line 122 to pass through, thereby achieving sealing and insulation.

[0139] In one example, motor assembly 10 is a three-phase motor with three sets of coils, each requiring a single drive wire 122. The three sets of coils are arranged at equal angles circumferentially. Therefore, the three transmission channels 230 are also arranged at equal angles circumferentially.

[0140] In the embodiments of this application, the wiring of the motor assembly 10 is facilitated by providing a transmission channel 230 for accommodating the drive line 122.

[0141] Figure 6 This is a schematic diagram of the overall structure of the motor assembly 10 of the interventional catheter system according to some embodiments of this application; Figure 7 for Figure 6 A sectional view.

[0142] like Figures 1 to 7 As shown, in some embodiments of this application, the motor assembly 10 of the interventional catheter system further includes an impeller 310 and a pump housing 300. The impeller 310 is placed inside the pump housing 300 and is connected to the motor body 100 for driving the impeller 310 to rotate. The pump housing 300 is connected to the motor housing 200 and has a pumping window 301 for blood to enter and exit the pump housing 300.

[0143] For example, the impeller 310 and the pump housing 300 are combined to form a structure such as an axial flow pump or a centrifugal pump.

[0144] In one example, the impeller 310 can be rotatably connected to the shaft 110 of the motor body 100. As an example, the shaft 110 of the motor body 100 is connected to the impeller 310, and the motor body 100 can drive the impeller 310 to rotate in both directions.

[0145] In one example, the pump housing 300 and the motor housing 200 can be connected by welding, bonding, fastener connection, or other methods.

[0146] In some examples, the pumping window 301 is opposite the impeller 310 along the radial Y direction; or, the pumping window 301 is located between the impeller 310 and the chamber 201 along the axial X direction.

[0147] In some examples, the pump housing 300 is connected to the suction housing 11 via a transvalve tube. The suction housing 11 is located on the side of the pump housing 300 facing away from the motor assembly 10. The suction housing 11 includes a suction window. The suction housing 11 and the pump housing 300 are respectively connected to the two ends of the transvalve tube. The blood is drawn into the suction housing 11 by the power generated by the impeller 310. After passing through the transvalve tube, the blood flows out from the pump window 301.

[0148] In other examples, the pump housing 300 is in communication with the suction housing 11, which is located on the side of the pump housing 300 facing away from the motor assembly 10. The suction housing 11 includes a suction window and is connected to the pump housing 300. Blood is drawn into the suction housing 11 by the power generated by the impeller 310 and flows out from the pump window 301.

[0149] In the embodiments of this application, the impeller 310 and the pump housing 300 are configured to generate a driving force for blood in the interventional catheter system, thereby realizing the pumping of blood.

[0150] Some embodiments of this application provide a motor housing 200 for an interventional catheter system, including a wall portion 210, a flow channel 220 formed within the wall portion 210, and a transmission channel 230 disposed at one end of the wall portion 210 along the axial direction X of the motor housing 200. The wall portion 210 encloses a chamber 201, and the transmission channel 230 communicates with the chamber 201. The flow channel 220 extends along the axial direction X for conveying fluid into the motor housing 200, and the flow channel 220 is spirally arranged about the axis of the motor housing 200.

[0151] Figure 8 This is a schematic diagram of the interventional catheter system according to an embodiment of this application.

[0152] like Figures 1 to 8 As shown, this application embodiment also provides an interventional catheter system, including an infusion device 13, a sheath 12, an aspiration housing 11, and a motor assembly 10 of the interventional catheter system described above. The aspiration housing 11 is connected to the distal end of the motor assembly 10, and the infusion device 13 is connected to the proximal end of the motor assembly 10 through the sheath 12. The sheath 12 is connected to a flow channel 220 and is used to input fluid from the infusion device 13 into the flow channel 220.

[0153] Exemplarily, the infusion device 13 includes a liquid storage mechanism 15 and a pumping mechanism 14. In one example, the pumping mechanism 14 may include one or more of a high-pressure injection pump, a peristaltic pump, and a gravity dripping system. In another example, the liquid storage mechanism 15 may be a container such as a tank, box, or pool structure for storing the infusion fluid.

[0154] The sheath 12 includes multiple outer tubes, an infusion tube fitted inside the outer tubes, a drainage tube, and cables. The infusion tube can be connected to the flow channel 220.

[0155] For example, the perfusion fluid may be one or more of physiological saline, cardioplegic solution, and glucose solution.

[0156] In some examples, the material of the sheath 12 can be a polymer material, a metal composite material, etc.

[0157] In other examples, the inhalation housing 11 may include an intervention tube and a spring tube.

[0158] For example, after connecting the suction housing 11, sheath 12, motor assembly 10 and infusion device 13, while the motor assembly 10 is being infused with fluid, the infusion device 13 is started to pump the infusion fluid through the sheath 12 into the first channel 240. Part of the fluid flows into the chamber 201 through the guide channel 220, and part of the fluid flows out through the shaft hole into the pump housing 300. The fluid in the chamber 201 flows back to the infusion device 13 through the second channel 250 for recycling.

[0159] This application provides a comparison table in its embodiments:

[0160] D / mm P N H1 / mm H2 / mm H3 / mm K1 K2 Example 1 3 1 2 12 13.5 9.04-26.94 0.48-1.43 0.67-2 Comparative Example 1 3 1 2 12 13.5 33.75 1.79 2.5 Comparative Example 2 3 1 2 12 13.5 5.67 0.3 0.42

[0161] Referring to Example 1 and Comparative Examples 1 and 2, when D = 3, H1 = 12, H2 = 13.5, P = 1, N = 2, and H1 < H2, H3 = 2 * 3 * 1 * 3.14 * K1 is calculated using equation (1), where 9.04 ≤ H3 ≤ 26.94. H3 = 13.5 * K2 is calculated using equation (2), where 9.04 ≤ H3 ≤ 27. Finally, the final range of H3 is 9.04 ≤ H3 ≤ 26.94. Using electromagnetic simulation software, the maximum no-load torque fluctuation of the motor assembly is found to be < 800 μN·m, indicating that the motor assembly operates smoothly.

[0162] In Comparative Example 1, H3 = 33.75 is selected, which falls outside the range of 9.04-26.94. At this time, according to the relationships (1) and (2), K1 = 1.79 and K2 = 2.5 are obtained. Through electromagnetic simulation software, it is found that the maximum no-load torque fluctuation of the motor assembly exceeds 800 μN·m. The no-load torque fluctuation of the motor assembly increases significantly, the running stability decreases significantly, and the motor assembly tends to be unstable.

[0163] In Comparative Example 1, H3 = 5.67 is selected, which falls outside the range of 9.04-26.94. At this time, according to the relationships (1) and (2), K1 = 0.3 and K2 = 0.42 are obtained. Through electromagnetic simulation software, it is found that the maximum no-load torque fluctuation of the motor assembly exceeds 800 μN·m. The no-load torque fluctuation of the motor assembly increases significantly, the running stability decreases significantly, and the motor assembly tends to be unstable.

[0164] Through Example 1 and Comparative Examples 1 and 2, it can be seen that when 9.04≤H3≤26.94, the motor assembly operates relatively smoothly, and the influence of the flow guide channel on the motor assembly is small. Furthermore, it is found that the pitch of the flow guide channel within the range of 0.48≤K1≤1.5 and 0.5≤K2≤2 has little impact on the motor's stability, and the motor assembly within this range operates relatively smoothly.

[0165] 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 motor assembly for an interventional catheter system, characterized in that, include: The motor body has a power output end; The motor housing includes a wall portion, a flow channel disposed within the wall portion, and a transmission channel disposed at one end of the wall portion along the axial direction of the motor housing. The wall portion encloses and forms a cavity. A portion of the motor body is accommodated in the cavity. The transmission channel communicates with the cavity and is used to guide a portion of the motor body out of the motor housing. The flow channel extends along the axial direction and is used to deliver fluid into the motor housing. The flow channel is spirally arranged about the axis of the motor housing.

2. The motor assembly of the interventional catheter system according to claim 1, characterized in that, The motor housing is made of iron core. The motor body includes a rotating shaft, a stator structure, and a rotor structure. The stator structure and the rotor structure are both placed in the cavity. The rotor structure is mounted on the rotating shaft, and the stator structure is mounted on the wall. The rotor structure and the stator structure are spaced apart along the radial direction of the motor housing. One end of the rotating shaft extends out of the motor housing and serves as the power output end. Along the axial direction, the stator structure is located between the two ends of the flow channel.

3. The motor assembly of the interventional catheter system according to claim 2, characterized in that, The flow guiding channel is arranged helically and symmetrically about the axis of the motor housing, and the pitch of the flow guiding channel is positively correlated with the outer diameter of the rotor structure and the number of pole pairs of the rotor structure, respectively.

4. The motor assembly of the interventional catheter system according to claim 3, characterized in that, The pitch of the flow guide channel is positively correlated with the product of the outer diameter of the rotor structure and the number of pole pairs of the rotor structure.

5. The motor assembly of the interventional catheter system according to claim 4, characterized in that, The pitch of the flow guide channel and the motor body at least satisfy the relationship shown in equation (1); H3=π*D*P*N*K1 Equation (1) Wherein, H3 is the pitch of the flow guide channel, D is the outer diameter of the rotor structure, P is the number of pole pairs of the rotor structure, N is the number of the flow guide channels and is a positive integer greater than 0, and K1 is a constant and satisfies 0.48≤K1≤1.

5.

6. The motor assembly of the interventional catheter system according to claim 5, characterized in that, When H1 = H2, the pitch of the flow guide channel and the motor body satisfy the relationship shown in equation (1); When H1 < H2, the pitch of the flow guide channel and the motor body satisfy the relationship shown in equations (1) and (2); H3 = K2 * H2 Equation (2) Wherein, H1 is the length of the rotor structure along the axial direction, H2 is the length of the stator structure along the axial direction, and K2 is a constant that satisfies 0.5≤K2≤2.

7. The motor assembly of the interventional catheter system according to any one of claims 1 to 6, characterized in that, The wall portion includes an inner wall and an outer wall, the inner wall enclosing to form the cavity, the outer wall enclosing to form a first receiving cavity, the inner wall being placed within the first receiving cavity, and the inner wall being in at least circumferential contact with the outer wall; At least one of the inner wall and the outer wall has a groove, and the groove is located between the inner wall and the outer wall, forming the flow channel.

8. The motor assembly of the interventional catheter system according to any one of claims 1 to 6, characterized in that, The wall portion has a first channel and a second channel, one of which is used for fluid input and the other for fluid output. The flow channel connects the first channel to one end of the chamber along the axial direction, and the second channel connects to the other end of the chamber.

9. The motor assembly of the interventional catheter system according to any one of claims 2 to 6, characterized in that, The stator structure includes a connected stator assembly and a drive line. The stator assembly is placed in the cavity and mounted on the wall. A portion of the drive line is accommodated in the transmission channel. The drive line is used to transmit power to the stator assembly.

10. The motor assembly of the interventional catheter system according to claim 1, characterized in that, It also includes an impeller and a pump housing, the pump housing is located on the power output end side, the impeller is placed inside the pump housing, the impeller is connected to the power output end of the motor body, the pump housing is connected to the motor housing, and the pump housing has a pumping window.

11. A motor housing for an interventional catheter system, characterized in that, include: The wall portion, the guide channel formed within the wall portion, and the transmission channel located at one end of the wall portion along the axial direction of the motor housing, the wall portion enclosing a cavity, and the transmission channel communicating with the cavity; The flow channel extends along the axial direction and is used to deliver fluid into the motor housing. The flow channel is spirally arranged about the axis of the motor housing.

12. An interventional catheter system, characterized in that, The system includes an infusion device, a sheath, an aspiration housing, and a motor assembly of an interventional catheter system according to any one of claims 1 to 10, wherein the aspiration housing is connected to the distal end of the motor assembly, the infusion device is connected to the proximal end of the motor assembly via the sheath, and the sheath communicates with the flow channel for introducing fluid from the infusion device into the flow channel.

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