Motors and ventricular assist devices

Abstract

The motor (11) of the ventricular assist device (10) includes a housing (200), a sensing assembly (300), a stator assembly (400), and a control assembly (500), the housing (200) enclosing a receiving cavity (210), the sensing assembly (300) including a sensing circuit board (310), the sensing circuit board (310) being received within the receiving cavity (210), and the stator assembly (400). is provided through the sensing circuit board (310), the control assembly (500) includes a control circuit board (520) electrically connected to the sensing circuit board (310), the control circuit board (520) is accommodated in the accommodation cavity (210), and the control circuit board (520) is disposed on the peripheral side of the stator assembly (400), so that the control circuit board (520) does not occupy space in the axial direction of the motor (11), and the safety of the ventricular assist device (10) is improved.

Description

[Technical Field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority to a Chinese patent application bearing application number 202310481556.6, filed with the State Intellectual Property Office of the People's Republic of China on April 27, 2023, the entire contents of which are incorporated herein by reference.

[0002] This application relates to the medical device arts, and more particularly to motors and ventricular assist devices. [Background technology]

[0003] The incidence of cardiovascular disease is increasing year by year, and the mortality rate from serious diseases such as cardiogenic shock and cardiac failure is extremely high. A ventricular assist device (VAD) is a device that can treat the above diseases. The blood flows out after work is done by the impeller of the VAD, ensuring that the blood pumped by the VAD meets the patient's blood flow and perfusion pressure requirements. However, conventional VADs usually have a risk of contact with other organs in the thoracic cavity, which affects the safety of the VAD. Summary of the Invention [Problem to be solved by the invention]

[0004] Based on this, the present invention provides a motor and a ventricular assist device with higher safety. The embodiments of the present invention achieve the above object by the following technical means. [Means for solving the problem]

[0005] An embodiment of the first aspect of the present application is a housing enclosing a receiving cavity; a sensing assembly including a sensing circuit board housed within the housing cavity; a stator assembly provided through the sensing circuit board; a control assembly including a control circuit board electrically connected to the sensing circuit board, the control circuit board being housed within the housing cavity and positioned on the circumferential side of the stator assembly;

[0006] An embodiment of a second aspect of the present application provides a ventricular assist device including a motor, the motor comprising: a housing enclosing a receiving cavity; a sensing assembly including a sensing circuit board housed within the housing cavity; a stator assembly provided through the sensing circuit board; a control assembly including a control circuit board electrically connected to the sensing circuit board, the control circuit board being housed within the housing cavity and positioned around the stator assembly;

[0007] The details of one or more embodiments of the invention are set forth in the drawings and description that follow. Other features, objects, and advantages of the invention will become apparent from the description, drawings, and claims.

[0008] In order to more clearly explain the technical solutions in the embodiments of the present application, the drawings necessary for explaining the embodiments or the prior art are briefly introduced below. Obviously, the drawings described below are only a part of the embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without any creative work. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a structural schematic diagram of a ventricular assist device provided herein; [Figure 2] FIG. 2 is a partially exploded view of the ventricular assist device shown in FIG. 1. [Figure 3] FIG. 2 is a structural schematic diagram of the motor provided in the present application after removing the housing. [Figure 4] FIG. 2 is a longitudinal cross-sectional view of the motor of the ventricular assist device shown in FIG. 1. [Figure 5] 1 is a structural schematic diagram of a motor provided in the present application; [Figure 6] FIG. 6 is a top view of the motor shown in FIG. 5. [Figure 7] FIG. 6 is a top view of the sensing assembly of the motor shown in FIG. 5. [Figure 8] FIG. 6 is a partial top view of the motor shown in FIG. 5. [Figure 9] FIG. 4 is a structural schematic diagram of the motor shown in FIG. 3 as seen from another angle. [Figure 10] FIG. 6 is a structural schematic diagram of a control assembly for the motor shown in FIG. 5. [Figure 11] FIG. 6 is a structural schematic diagram of a fixing member of the motor shown in FIG. 5. [Figure 12] 12 is a structural schematic diagram of the fixing member shown in FIG. 11 as viewed from another angle. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] In order to clarify the objectives, technical means and advantages of the present application, the present application will be described in more detail below with reference to the accompanying drawings and examples. It should be understood that the specific examples described herein are only for the purpose of interpreting the present application, and are not intended to limit the present application.

[0011] When an element is described as being "fixed" or "disposed" on another element, the element may be directly or indirectly disposed on the other element. When an element is described as being "connected" to another element, the element may be directly or indirectly connected to the other element.

[0012] Additionally, the terms "first" and "second" are merely descriptive and should not be understood to denote or imply relative importance or the number of technical features being presented. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "plurality" means two or more, unless otherwise specified.

[0013] The inventors of the present application discovered that, in conventional ventricular assist devices, the motor has only one sensing circuit board and one control circuit board, and the sensing circuit board is located adjacent to one axial end of the stator assembly, while the control circuit board is located adjacent to the other axial end of the stator assembly, resulting in a large axial thickness of the motor. When the control circuit board, stator assembly, and sensing circuit board are considered as a whole, this entire thickness is large, which in turn results in a large thickness of the motor and the ventricular assist device including the motor. When a ventricular assist device with a large thickness is implanted in a patient's body, it increases the risk of the ventricular assist device coming into contact with other organs in the thoracic cavity, thereby affecting the safety of the ventricular assist device.

[0014] In this specification, the axial direction of the stator assembly and the axial direction of the motor have the same meaning, i.e., the axial direction of the motor is the axial direction of the stator assembly, and the radial direction of the stator assembly and the radial direction of the magnetic core have the same meaning.

[0015] To address the above-mentioned problems, the present application proposes a motor and a ventricular assist device, in which the control circuit board of the motor is located on the peripheral side of the stator assembly, so that the control circuit board does not occupy axial space of the motor, the thickness of the motor is reduced, and the risk of contact with other organs in the thoracic cavity when the ventricular assist device is implanted in the patient's body is reduced, thereby improving the safety performance of the ventricular assist device. Hereinafter, the motor and ventricular assist device provided in the present application will be described in detail with reference to specific embodiments and the drawings of the specification.

[0016] 1 to 3, a ventricular assist device 10 provided herein includes a motor 11 and a pump body 12. The motor 11 includes a housing 200, a sensing assembly 300, a stator assembly 400, a control assembly 500 (FIG. 5), and a rotor 600. The pump body 12 includes a pump housing 120 and an impeller (not shown). The pump housing 120 is connected to the housing 200 in a detachable or non-detachable manner. The pump housing 120 seals the opening of the receiving cavity 210. The pump housing 120 surrounds the receiving cavity 121, and the rotor 600 and the impeller are located within the receiving cavity 121, with the rotor 600 fixed to the impeller. The rotor 600 has a substantially circular ring shape. The pump housing 120 is provided with a liquid inlet 122 and a liquid outlet 123, both of which communicate with the receiving cavity 121. When the stator assembly 400 is energized, the stator assembly 400 generates a magnetic field, driving the rotor 600 to rotate in a floating state within the receiving cavity 121, thereby causing the impeller to rotate in a floating state within the receiving cavity 121 following the rotor 600. The rotating impeller generates a pump suction force, causing liquid to enter the receiving cavity 121 through the liquid inlet 122, pass through the receiving cavity 121, and be discharged out of the ventricular assist device 10 through the liquid outlet 123, thereby realizing the liquid pumping function of the ventricular assist device 10.

[0017] 2, 4, and 5, the housing 200 includes a bottom wall 201, a cover plate 204, and a peripheral wall 202. The bottom wall 201 and the cover plate 204 are disposed opposite each other, and the peripheral wall 202 is connected between the bottom wall 201 and the cover plate 204. The bottom wall 201 and the peripheral wall 202 enclose an open accommodating cavity 210, and the cover plate 204 covers the peripheral wall 202 to shield the accommodating cavity 210. The sensing assembly 300, the stator assembly 400, and the control assembly 500 are all located within the accommodating cavity 210. In the present application, the motor 11 is applied to the ventricular assist device 10, and the pump housing 120 seals the opening of the accommodating cavity 210; that is, the cover plate 204 is a part of the pump housing 120. Specifically, the cover plate 204 is the bottom wall of the accommodating cavity 210. In other embodiments, the motor 11 may be applicable to other devices, in which case the cover plate 204 may simply be part of the housing 200 of the motor 11. In this application, the housing 200 is generally volute-shaped, and therefore the receiving cavity 210 enclosed by the housing 200 is also generally volute-shaped.

[0018] 3-5, in some embodiments, bottom wall 201 has a bottom wall surface 211 that defines a portion of the boundary of receiving cavity 210, and bottom wall surface 211 of housing 200 can be understood as the bottom surface of receiving cavity 210. Pump housing 120 further has a top wall surface 124 that is disposed opposite bottom wall surface 211, and top wall surface 124 can be understood as the cavity top surface of receiving cavity 210.

[0019] The stator assembly 400 is accommodated in the accommodation cavity 210. The stator assembly 400 includes a back plate 401, a winding unit 402, and an insulating film 403, and there are a plurality of winding units 402. The plurality of winding units 402 are arranged on the back plate 401, for example, the plurality of winding units 402 are arranged in a circular array on the back plate 401. Each winding unit 402 includes a magnetic core 410, a pole piece 420, and a coil 430.

[0020] The magnetic cores 410 of the multiple winding units 402 are arranged along a circle, and the extending directions of the magnetic cores 410 of the multiple winding units 402 are parallel to each other. Here, the extending direction of the magnetic cores 410 is parallel to the axial direction of the stator assembly 400. The rotor 600 is disposed on the side of the cover plate 204 away from the stator assembly 400. Specifically, the rotor 600 is disposed in the receiving cavity 121 surrounded by the pump housing 120. The magnetic core 410 is cylindrical, and the central axis of the magnetic core 410 passes through the rotor 600, so that the magnetic core 410 faces the rotor 600 approximately directly. That is, the high magnetic field strength area of ​​the rotor 600 faces the magnetic core 410 approximately directly, which increases the reaction force of the rotor 600 on the stator assembly 400 and increases the acting force of the stator assembly 400 on the rotor 600, thereby improving the driving efficiency of the stator assembly 400 on the rotor 600. Here, the central axis of the magnetic core 410 refers to the central axis of the column in which the magnetic core 410 is located. One end of the magnetic core 410 is fixed to the back plate 401, and the other end is fixedly connected to the pole piece 420.

[0021] The side of the pole piece 420 away from the magnetic core 410 contacts the cover plate 204, i.e., the pole piece 420 contacts the top wall surface 124. This allows the top wall surface 124 to position the pole piece 420, which is advantageous for correct assembly of the pole piece 420 and the magnetic core 410, and also allows the heat generated by the magnetic core 410 and the pole piece 420 during operation to be transferred to the external environment via the pump housing 120, improving the heat dissipation effect of the motor 11 and the ventricular assist device 10. Furthermore, the pole piece 420 is located closer to the impeller, improving the driving efficiency of the stator assembly 400.

[0022] Coil 430 is wound around magnetic core 410. When coil 430 is energized, it generates a rotating magnetic field that drives the rotation of the impeller.

[0023] The insulating film 403 is disposed between the coil 430 and the sensing assembly 300 and has good insulating properties.

[0024] 4 to 6, the sensing assembly 300 includes a sensing circuit board 310, which is housed in the receiving cavity 210. The stator assembly 400 is disposed through the sensing circuit board 310. Specifically, the sensing circuit board 310 is disposed in the receiving cavity 210 substantially perpendicular to the axial direction of the stator assembly 400, and the sensing circuit board 310 is closer to the top wall surface 124 of the pump housing 120 than the back plate 401. That is, when the ventricular assist device 10 is placed upright (with the inlet 122 facing upward), the sensing circuit board 310 is located above the back plate 401. The sensing circuit board 310 has an upper surface 311 and a lower surface 312 facing each other, and the upper surface 311 is closer to the top wall surface 124 than the lower surface 312, i.e., the upper surface 311 is farther from the bottom wall surface 211 of the accommodating cavity 210 than the lower surface 312, and the lower surface 312 is closer to the bottom wall surface 211 than the upper surface 311.

[0025] The sensing circuit board 310 includes a circuit board body 313 and a connecting portion 314. The circuit board body 313 is generally disc-shaped, and the connecting portion 314 protrudes from the periphery of the circuit board body 313. The connecting portion 314 is generally triangular, and is used to mount a control chip of the control assembly 500. In this embodiment, the circuit board body 313 and the connecting portion 314 are integrally molded. In other embodiments, the circuit board body 313 and the connecting portion 314 may be connected by adhesive bonding, welding, or other methods. The magnetic core 410 penetrates the circuit board body 313 of the sensing circuit board 310. The pole piece 420 contacts the top wall surface 124 of the pump housing 120, and is positioned between the top wall surface 124 and the circuit board body 313. The connecting portion 314 is electrically connected to the control assembly 500.

[0026] 5 , the receiving cavity 210 has a generally volute shape, including one circular region and one generally triangular region, but conventional stators are generally cylindrical, making it difficult to fully utilize the volute-shaped receiving cavity 210. In the ventricular assist device 10 of the present application, the sensing circuit board 310 is configured to have a circuit board main body 313 and connecting portions 314 protruding from the periphery thereof, thereby allowing the outer contour of the sensing circuit board 310 to better fit the volute-shaped receiving cavity 210 and allowing the connecting portions 314 and the control chip mounted on the connecting portions 314 to fully utilize the existing space in the receiving cavity 210 (here, the existing space refers to the generally triangular region of the volute shape). This eliminates the need for a separate circuit board for mounting the control chip, which would otherwise occupy space in the axial direction of the motor 11, thereby reducing the thickness of the motor 11 and, therefore, the thickness of the ventricular assist device 10.

[0027] 3 to 5 , in some embodiments, one end of the magnetic core 410 away from the back plate 401 is flush with the top surface 311 of the circuit board body 313, and the pole piece 420 is fixed to the end of the magnetic core 410 away from the back plate 401, which may be fixed by welding or adhesive. The pole piece 420 extends radially of the magnetic core 410, and the pole piece 420 fixed to the upper end of the magnetic core 410 contacts the top surface 311 of the circuit board body 313. By disposing the pole piece 420 between the top surface 311 of the circuit board body 313 and the top wall surface 124 of the pump housing 120 and contacting both the top surface 311 and the top wall surface 124, the gap between the top surface 311 and the top wall surface 124 becomes the thickness of the pole piece 420, and the gap between the top surface 311 and the top wall surface 124 is minimized, thereby reducing the thickness of the motor 11.

[0028] The sensing assembly 300 further includes a sensor 320 electrically connected to the sensing circuit board 310, and the sensor 320 is disposed on the lower surface 312 of the circuit board body 313, i.e., the sensor 320 is in physical contact with the side of the circuit board body 313 away from the pole piece 420. The sensor 320 can detect the rotational speed and flying height of the rotor 600 and the impeller, and the sensor 320 transmits the detection information to the control assembly 500 via the sensing circuit board 310. The control assembly 500 can adjust the current of the coil 430 based on the detection information, thereby adjusting and controlling the rotational speed and flying height of the rotor 600 and the impeller.

[0029] In some embodiments, the thickness of sensor 320 is greater than the thickness of pole piece 420, and the thickness of sensor 320 is substantially fixed by the limitations of its internal chip structure, for example, the thickness of sensor 320 may be approximately 0.75 mm. The thickness of pole piece 420 is between 0.3 mm and 0.5 mm, for example, the thickness of pole piece 420 may be 0.3 mm, 0.4 mm, 0.5 mm, etc., so that pole piece 420 is less likely to deform without increasing the thickness of motor 11; if the thickness is too thin, it will be more likely to deform, and if the thickness is too thick, it will affect the overall thickness of motor 11 and ventricular assist device 10.

[0030] For the ventricular assist device 10 to operate stably, at least two conditions must be met. The first condition is that the pole piece 420 must be in contact with the top wall surface 124 of the pump housing 120, allowing the top wall surface 124 to position the pole piece 420 and allow heat generated by the coil 430 to be transferred to the external environment through the pump housing 120, and also bringing the pole piece 420 closer to the impeller to improve the driving efficiency of the stator assembly 400. The second condition is that a certain axial distance must be maintained between the sensor 320 and the top wall surface 124 to ensure the detection accuracy of the sensor 320. If the axial distance between the sensor 320 and the top wall surface 124 is too small, the magnetic flux received by the sensor 320 will be too large, causing magnetic flux saturation in the sensor 320 and distortion, which will likely result in reduced detection accuracy. If the axial distance between the sensor 320 and the top wall surface 124 is too large, the magnetic flux received by the sensor 320 will be insufficient, which will also likely result in reduced detection accuracy.

[0031] As described above, when the upper end of the magnetic core 410 is flush with the upper surface 311 of the circuit board body 313, the pole piece 420 fixed to the upper end of the magnetic core 410 contacts the upper surface 311 of the circuit board body 313. However, because the thickness of the sensor 320 is greater than the thickness of the pole piece 420 and the sensor 320 maintains a certain axial distance from the top wall surface 124, the pole piece 420 cannot contact the top wall surface 124 when the sensor 320 is disposed on the upper surface 311 of the circuit board body 313. In this case, in order to contact the pole piece 420 with the top wall surface 124, it is necessary to extend the length of the magnetic core 410 and position the upper end of the magnetic core 410 above the upper surface 311, thereby satisfying the condition for the pole piece 420 fixed to the upper end of the magnetic core 410 to contact the top wall surface 124. This increases the length of the magnetic core 410, and when the sensing assembly 300 and the stator assembly 400 are considered as a single whole, the axial length of the entire assembly increases. This increases the axial distance between the top wall surface 124 and the bottom wall surface 211, i.e., the axial length of the accommodating cavity 210, and increases the thickness of the motor 11 and the ventricular assist device 10, making the ventricular assist device 10 more likely to come into contact with other organs in the thoracic cavity, affecting safety in use.

[0032] In the present application, by disposing the sensor 320 on the underside 312 of the circuit board body 313, the length of the magnetic core 410 can be reduced, thereby reducing the axial thickness of the motor 11 and the ventricular assist device 10, reducing the risk of contact with other organs in the thoracic cavity when the ventricular assist device 10 is implanted in a patient's body, and improving the safety performance of the ventricular assist device 10. Furthermore, disposing the sensor 320 on the underside 312 of the circuit board body 313 places the sensor 320 farther from the top wall surface 124 than disposing the sensor 320 on the top surface 311 of the circuit board body 313, and the distance between the sensor 320 and the top wall surface 124 is approximately equal to the sum of the thicknesses of the pole piece 420 and the circuit board body 313, which can meet the detection accuracy requirements.

[0033] 4, 5 and 7, sensor 320 is disposed on lower surface 312 of circuit board body 313, and sensor 320 is located between circuit board body 313 and coil 430. To prevent coil 430 from contacting sensor 320, the axial length of coil 430 needs to be reduced. However, to ensure the magnetic field strength after coil 430 is energized, the number of turns of coil 430 needs to be kept unchanged, and therefore the magnetic field strength can be ensured by reasonably reducing the winding diameter of coil 430.

[0034] The insulating film 403 is disposed between the coil 430 and the sensing assembly 300. Specifically, the insulating film 403 is located between the coil 430 and the sensor 320. The outer contour of the insulating film 403 substantially matches the outer contour formed by the coils 430, covering the ends of the coils 430 and isolating the sensor 320 from the coils 430. The insulating film 403 has a through-hole through which the magnetic core 410 passes. The insulating and isolating effect of the insulating film 403 prevents the sensor 320 from contacting the coil 430 and establishing an electrical connection, preventing heat from the coil 430 from being transferred to the sensor 320 and damaging it, and preventing a momentary high voltage from the coil 430 from damaging the sensor 320 and other components on the sensing circuit board 310. There may be an additional gap between the sensor 320 and the insulating film 403, which allows the sensor 320 and the insulating film 403 to maintain a non-contact relationship, thereby more effectively preventing the sensor 320 from contacting the coil 430 and forming an electrically conductive relationship.

[0035] 2 and 5, in some embodiments, the number of sensors 320 and the number of magnetic cores 410 are both multiple, each sensor 320 is located between two adjacent magnetic cores 410, and the multiple sensors 320 are arranged in a circular array with respect to the central axis of the stator assembly 400.

[0036] 7 and 8 , the sensor 320 has a substantially rectangular parallelepiped shape and has a width and a length. In the present application, the width of each sensor 320 coincides with the radial direction of the stator assembly 400, and the length of the sensor 320 is substantially tangent to the circle on which the circular array formed by the multiple sensors 320 is located, so that the outer and inner contours of the multiple sensors 320 each form a circle, and the entire multiple sensors 320 substantially form a ring. Compared to an arrangement in which the length of the sensors 320 coincides with the radial direction of the stator assembly 400, the width of the ring formed by the entire multiple sensors 320 in the present application is smaller, so that the orthogonal projections of the multiple sensors 320 onto the rotor 600 overlap as much as possible with the rotor 600, increasing the accuracy of detection information such as the rotational speed and floating height of the rotor 600 and impeller that the sensors 320 can sense, thereby improving the detection accuracy of the sensors 320.

[0037] 8 , the central axes of the magnetic cores 410 form the cylindrical surface 203, i.e., the central axes of the magnetic cores 410 are all located on the cylindrical surface 203. Because the coil 430 is wound around the magnetic core 410, the central axis of the magnetic core 410 is also the central axis of the coil 430. In the illustrated embodiment, the center of each sensor 320 is located on the cylindrical surface 203. That is, the projection of the sensor 320 onto the sensing circuit board 310 and the projection of the magnetic core 410 onto the sensing circuit board 310 are located on the same circumference. Considering that the central axis of the magnetic core 410 passes through the rotor 600, the magnetic core 410 faces the rotor 600 axially, and therefore the sensor 320 faces the rotor 600 axially, further improving the detection accuracy of the sensor 320.

[0038] 5 and 8 , in some embodiments, the width of the pole piece 420 gradually increases from the center of the circuit board body 313 to the edge of the circuit board body 313, thereby forming the pole piece 420 in a generally trapezoidal shape. This allows the magnetic field of the stator assembly 400 to have better linear distribution characteristics. The pole piece 420 has a first end 421 and a second end 422 along the radial direction of the stator assembly 400, with the first end 421 being closer to the center of the sensing circuit board 310 than the second end 422 (i.e., the second end 422 being closer to the edge of the circuit board body 313). Obviously, the width of the first end 421 is smaller than the width of the second end 422.

[0039] The first end 421 and the second end 422 are located on both the inner and outer sides of the cylindrical surface 203, and the distance from the first end 421 to the cylindrical surface 203 is greater than the distance from the second end 422 to the cylindrical surface 203. Compared to an arrangement in which the distance from the first end 421 to the cylindrical surface 203 is equal to the distance from the second end 422 to the cylindrical surface 203, the above arrangement increases the radius of the circle corresponding to the cylindrical surface 203, increases the radius of the coil 430, and increases the number of turns of the coil 430, thereby improving the driving efficiency of the motor 11.

[0040] 5, 9 and 10, in some embodiments, the control assembly 500 includes a fixed member 510 and a control circuit board 520, where the fixed member 510 is attached to the receiving cavity 210, the control circuit board 520 is attached to the fixed member 510, and the control circuit board 520 is electrically connected to the sensing circuit board 310.

[0041] Specifically, the fixing member 510 is provided between the connecting portion 314 and the inner wall of the housing 200. In the illustrated embodiment, the number of fixing members 510 is one. The contour of the side of the fixing member 510 facing the connecting portion 314 corresponds to the contour of the connecting portion 314. That is, the contour of the side of the fixing member 510 facing the connecting portion 314 is substantially the same as the contour of the connecting portion 314, for example, both are "L"-shaped, arc-shaped, or other shapes, so that the fixing member 510 is as close to the connecting portion 314 as possible and the gap between the fixing member 510 and the connecting portion 314 is small, thereby reducing the volume of the motor 11 and the ventricular assist device 10.

[0042] In this embodiment, the contour of the side of the fixing member 510 away from the connection portion 314 corresponds to the contour of a portion of the inner wall of the housing 200. That is, the contour of the side of the fixing member 510 away from the connection portion 314 is substantially the same as the contour shape of the portion of the inner wall of the housing 200, which allows the fixing member 510 to fully utilize the space within the accommodating cavity 210 and reduces the volume of the motor 11 and the ventricular assist device 10.

[0043] The number of control circuit boards 520 is multiple, and the multiple control circuit boards 520 are electrically connected to each other, with one of the control circuit boards 520 electrically connected to the sensing circuit board 310. The fixing member 510 is provided with multiple mounting grooves 511 and at least one wiring groove 512, and the multiple mounting grooves 511 respectively accommodate the multiple control circuit boards 520, with each control circuit board 520 fitted into one mounting groove 511, and two adjacent mounting grooves 511 each communicating with one wiring groove 512, and each wiring groove 512 can accommodate a cable 513 connecting two adjacent control circuit boards 520. Providing the wiring grooves 512 in the fixing member 510 not only allows the cable 513 to be accommodated, but also facilitates assembly of the control assembly 500 and reduces the space occupied by the cable 513, which is advantageous for miniaturizing the motor 11 and the ventricular assist device 10.

[0044] 10 to 12 , the area of ​​the single control circuit board 520 is smaller than that of the circuit board body 313. In other words, when the single control circuit board 520 and the circuit board body 313 are arranged horizontally, the area covered by the circuit board body 313 is larger than that of the single control circuit board 520. The control circuit board 520 is arranged on the periphery of the stator assembly 400, specifically, the control circuit board 520 is arranged between the stator assembly 400 and the peripheral wall 202. After the ventricular assist device 10 is assembled and shaped, and when the ventricular assist device 10 is correctly placed, the circuit board body 313 is still arranged horizontally, and the control circuit board 520 is arranged vertically, i.e., the control circuit board 520 is arranged approximately along the axial direction of the stator assembly 400. The control circuit board 520 has an upper surface 501 that is positioned away from the bottom wall surface 211 of the accommodating cavity 210, and the side of the control circuit board 520 that is away from the bottom wall 201 does not exceed the surface of the sensing circuit board 310 that is away from the bottom wall 201, and the distance from the upper surface 501 of the control circuit board 520 to the bottom wall surface 211 is equal to or less than the distance from the upper surface 311 to the bottom wall surface 211. In other words, the height at which the upper surface 501 of the control circuit board 520 is positioned relative to the bottom wall surface 211 does not exceed the height at which the upper surface 311 is positioned relative to the bottom wall surface 211, thereby avoiding an increase in the thickness of the motor 11.

[0045] When the sensing circuit board 310 is disposed adjacent to one axial end of the stator assembly 400 and the control circuit board 520 is disposed adjacent to the other axial end of the stator assembly 400, the sensing circuit board 310, the stator assembly 400, and the control circuit board 520 are arranged sequentially along the axial direction. If the control circuit board 520, the stator assembly 400, and the sensing circuit board 310 are considered as a single overall assembly, the axial length of the overall assembly is large, which increases the axial length (i.e., thickness) of the motor 11 and the ventricular assist device 10 including the motor 11. When a ventricular assist device 10 with a large thickness is implanted in a patient's body, the risk of the ventricular assist device 10 coming into contact with other organs in the thoracic cavity increases, which affects the safety of the ventricular assist device 10.

[0046] However, in the motor 11 and ventricular assist device 10 of this embodiment, since the multiple control circuit boards 520 are arranged around the stator assembly 400 and are located lower than the sensing circuit board 310 in the thickness direction of the sensing circuit board 310, the space required for arranging the control circuit boards 520 in the axial direction is reduced compared to a system in which the control circuit boards 520 are arranged along the axial direction of the stator assembly 400, thereby reducing the thickness of the motor 11 and ventricular assist device 10 and significantly reducing the risk of the ventricular assist device 10 coming into contact with other organs in the thoracic cavity, thereby improving the safety of using the ventricular assist device 10.

[0047] In some embodiments, the fixing member 510 has an apex that is spaced apart from the bottom wall 211 of the receiving cavity 210, and the distance from the apex of the fixing member 510 to the bottom wall 211 is equal to or less than the distance from the top surface 311 to the bottom wall 211. That is, the fixing member 510 is also lower than the sensing circuit board 310 in the thickness direction of the sensing circuit board 310, so that the entire control assembly 500 does not exceed the sensing circuit board 310, which is also advantageous for reducing the thickness of the motor 11 and the ventricular assist device 10. Because the fixing member 510 is made of a metal material and is in contact with the housing 200, the fixing member 510 has good thermal conductivity, allowing heat generated during operation of the control circuit board 520 to be quickly conducted to the housing 200 via the fixing member 510 and then dissipated to the outside, thereby improving the heat dissipation effect of the motor 11 and the ventricular assist device 10.

[0048] In some embodiments, the control circuit board 520 is disposed parallel to the axial direction of the stator assembly 400, but the sensing circuit board 310 is perpendicular to the axial direction of the stator assembly 400, and therefore the control circuit board 520 is perpendicular to the sensing circuit board 310. When there are multiple control circuit boards 520, each control circuit board 520 is parallel to the axial direction of the stator assembly 400, and by disposing the control circuit boards 520 between the stator assembly 400 and the peripheral wall 202 of the housing 200 in a manner parallel to the axial direction of the stator assembly 400 and not tilting the control circuit boards 520 relative to the stator assembly 400, the radial space occupied by a single control circuit board 520 is minimized as much as possible, on the basis of reducing the axial thickness of the motor 11, which is advantageous for miniaturizing the motor 11 and the ventricular assist device 10.

[0049] In summary, the control circuit board 520 of the motor 11 provided in the present application is arranged on the circumferential side of the stator assembly 400, which reduces the space required to arrange the control circuit board 520 in the axial direction compared to an arrangement in which the control circuit board 520 is arranged along the axial direction of the stator assembly 400, thereby reducing the thickness of the motor 11 and the ventricular assist device 10, significantly reducing the risk of the ventricular assist device 10 coming into contact with other organs in the thoracic cavity, and improving the safety of using the ventricular assist device 10.

[0050] The above embodiments are only for illustrating the technical means of the present invention, and are not intended to limit the same. Although the present invention has been described in detail with reference to the above embodiments, it should be understood that those skilled in the art can still modify the technical means described in each of the above embodiments or replace some of the technical features with equivalents, and such modifications or replacements do not deviate from the essence of the corresponding technical means from the spirit and scope of the technical means of each embodiment of the present invention, and all should be included in the protection scope of the present invention.

Claims

1. a housing enclosing a receiving cavity; a sensing assembly including a sensing circuit board housed within the housing cavity; a stator assembly provided through the sensing circuit board; a control assembly including a control circuit board electrically connected to the sensing circuit board, the control circuit board being housed within the housing cavity and being positioned on the circumferential side of the stator assembly.

2. 2. The motor according to claim 1, wherein the housing includes a bottom wall and a peripheral wall connected to the bottom wall, the bottom wall and the peripheral wall enclose the accommodating cavity, and the control circuit board is disposed between the stator assembly and the peripheral wall.

3. 3. The motor according to claim 2, wherein the side of the control circuit board remote from the bottom wall does not extend beyond the surface of the sensing circuit board remote from the bottom wall.

4. 2. The motor according to claim 1, wherein the sensing circuit board includes a circuit board body and a connection portion protruding from a peripheral side of the circuit board body, and the connection portion is electrically connected to the circuit board body and the control circuit board.

5. 2. The motor of claim 1, wherein the control circuit board is perpendicular to the sensing circuit board, and the sensing circuit board is perpendicular to an axial direction of the stator assembly.

6. The number of the control circuit boards is plural, the plural control circuit boards are electrically connected to each other, and one of the control circuit boards is electrically connected to the sensing circuit board; 2. The motor of claim 1, wherein the control assembly further includes a fixing member, the fixing member being fixedly disposed within the accommodating cavity, the fixing member being provided with a plurality of mounting grooves and at least one wiring groove, the plurality of mounting grooves being capable of accommodating a plurality of the control circuit boards, each of the control circuit boards being fitted and accommodated in one of the mounting grooves, two adjacent mounting grooves being connected by one of the wiring grooves, and each of the wiring grooves being capable of accommodating a cable connecting two adjacent control circuit boards.

7. 7. The motor according to claim 6, wherein the fixing member is made of a metal material and is in contact with the housing.

8. 7. The motor according to claim 6, wherein the sensing circuit board includes a circuit board body and a connection portion protruding from a peripheral side of the circuit board body, the fixing member is disposed between the connection portion and an inner wall of the housing, and a contour of the fixing member on the side facing the connection portion corresponds to a contour of the connection portion.

9. 9. The motor according to claim 8, wherein the contour of the fixing member on the side remote from the connection portion corresponds to the contour of a portion of the inner wall of the housing.

10. the housing includes a bottom wall and a peripheral wall connected to the bottom wall, the bottom wall and the peripheral wall enclose the accommodating cavity, and the control circuit board is disposed between the stator assembly and the peripheral wall; the sensing circuit board has an upper surface and a lower surface facing each other, the upper surface being farther from a bottom wall surface of the receiving cavity than the lower surface; 7. The motor according to claim 6, wherein the fixed member has a top end that is spaced apart from the bottom wall surface, and the distance from the top end of the fixed member to the bottom wall surface is equal to or less than the distance from the top surface to the bottom wall surface.

11. the housing includes a bottom wall, a cover plate, and a peripheral wall connected between the bottom wall and the cover plate, the bottom wall and the peripheral wall enclose the storage cavity, and the cover plate is placed over the peripheral wall to shield the storage cavity; the stator assembly includes a magnetic core and a magnetic pole piece, the magnetic core is disposed through the sensing circuit board, the magnetic pole piece is connected to one end of the magnetic core and is capable of contacting the cover plate; 2. The motor of claim 1, wherein the sensing assembly further includes a sensor electrically connected to the sensing circuit board, the sensor being positioned on a side of the sensing circuit board away from the pole piece.

12. The motor of claim 11 , wherein the pole piece contacts the sensing circuit board.

13. 12. The motor according to claim 11, wherein the magnetic core is cylindrical, there are a plurality of the magnetic cores, the central axes of the plurality of magnetic cores form a cylindrical surface, and the center of the sensor is located on the cylindrical surface.

14. 14. The motor of claim 13, wherein the pole piece has a first end and a second end along a radial direction, the first end being closer to a center of the sensing circuit board than the second end, the first end and the second end being located on both inner and outer sides of the cylindrical surface, and the distance from the first end to the cylindrical surface being greater than the distance from the second end to the cylindrical surface.

15. 12. The motor of claim 11, wherein the motor further includes a rotor, the rotor being positioned on a side of the cover plate away from the stator assembly, the stator assembly cooperating with the rotor to drive rotation of the rotor, and the central axis of the magnetic core passing through the rotor.

16. 12. The motor according to claim 11, wherein the number of the sensors and the magnetic cores is plural, each of the sensors is located between two adjacent magnetic cores, the plural sensors are arranged in a circular array with respect to a central axis of the stator assembly, the sensors have a width direction, and the width direction of each of the sensors coincides with a radial direction of the stator assembly.

17. 12. The motor of claim 11, wherein the thickness of the pole piece is less than the thickness of the sensor.

18. 2. The motor of claim 1, wherein the stator assembly includes a back plate, a winding unit, and an insulating film, the winding unit is disposed on the back plate, the winding unit includes a magnetic core, a pole piece, and a coil, one end of the magnetic core is fixed to the back plate and the other end is fixedly connected to the pole piece, the coil is wound around the magnetic core, and the insulating film is disposed between the coil and the sensing assembly.

19. 19. The motor according to claim 18, wherein the number of the winding units is plural, and the outer contour of the insulating film coincides with the outer contour formed by the plurality of the coils.

20. A ventricular assist device comprising a motor according to any one of claims 1 to 19.

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