Drive unit and blood pump

Abstract

This invention relates to a drive device and a blood pump. The drive device includes: a housing assembly having a shaft bore and a limiting surface; a rotating shaft for fixedly connecting to an impeller, the shaft rotatably passing through the shaft bore; a rotor fixedly connected to the rotating shaft; and a stop member fixedly connected to at least one of the rotor and the rotating shaft, the stop member being located between the rotor and the limiting surface, the stop member having a stop surface opposite to the limiting surface, the stop surface being capable of abutting against the limiting surface to restrict movement of the rotating shaft in the axial direction of the rotating shaft, and at least one of the stop surface and the limiting surface having a roughness less than or equal to 0.1 micrometers. The above-described drive device and blood pump have a long service life.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a drive device and a blood pump including the drive device. Background Technology

[0002] An intravascular blood pump is a blood-pumping device that can be inserted into a patient's heart through a blood vessel. The pump is placed inside the opening of the heart valve, allowing blood to flow through the pump and into the artery. The pump consists of a drive unit and an impeller. The drive unit has a stationary part and a rotating part that rotates relative to the stationary part. The impeller is fixed to the rotating part, which drives the impeller to rotate. However, significant wear exists between the stationary and rotating parts, affecting the lifespan of the pump. Summary of the Invention

[0003] Therefore, it is necessary to provide a drive device and blood pump with a long service life.

[0004] A driving device for driving an impeller to rotate, the driving device comprising:

[0005] The housing assembly has a shaft hole and a limiting surface;

[0006] A rotating shaft for fixed connection with the impeller, the rotating shaft being rotatably inserted through the shaft hole;

[0007] The rotor is fixedly connected to the shaft; and

[0008] A stop member is fixedly connected to at least one of the rotor and the shaft, the stop member being located between the rotor and the limiting surface, the stop member having a stop surface opposite to the limiting surface, the stop surface being capable of abutting against the limiting surface to restrict the movement of the shaft in the axial direction of the shaft, and the roughness of at least one of the stop surface and the limiting surface being less than or equal to 0.1 micrometers.

[0009] In one embodiment, the roughness of both the stop surface and the limiting surface is less than or equal to 0.1 micrometers;

[0010] And / or, both the stop surface and the limiting surface are ceramic surfaces;

[0011] And / or, the limiting surface is perpendicular to the central axis of the shaft hole, and the stop surface is perpendicular to the axis of the rotating shaft.

[0012] In one embodiment, there are two limiting surfaces and two stop members. The rotor includes a first rotor unit and a second rotor unit arranged along the axis of the rotating shaft. Both the first rotor unit and the second rotor unit are fixed to the rotating shaft. Both the first rotor unit and the second rotor unit are located between the two limiting surfaces. A stop member is arranged between the first rotor unit and one of the limiting surfaces, and another stop member is arranged between the second rotor unit and the other limiting surface. The stop surfaces of the two stop members are respectively opposite to the two limiting surfaces, and the stop surfaces of the two stop members can respectively abut against the two limiting surfaces to restrict the movement of the rotating shaft in the axial direction of the rotating shaft.

[0013] In one embodiment, the driving device further includes a first stator unit and a second stator unit disposed along the axis of the rotating shaft. The first stator unit and the second stator unit are both located between the first rotor unit and the second rotor unit. The first stator unit can drive the first rotor unit to rotate, and the second stator unit can drive the second rotor unit to rotate. The first stator unit and the second stator unit both include a magnetic core and a coil, and the coil is wound on the magnetic core.

[0014] The drive device further includes a magnetic conductor fixed to the housing assembly. The magnetic core of the first stator unit and the magnetic core of the second stator unit are both fixed to the magnetic conductor. The rotating shaft is rotatably disposed through the first stator unit, the second stator unit and the magnetic conductor.

[0015] In one embodiment, the magnetic conductive member includes a first magnetic conductive plate portion and a second magnetic conductive plate portion, the second magnetic conductive plate portion and the first magnetic conductive plate portion are stacked, the first magnetic conductive plate portion is fixedly connected to the magnetic core of the first stator unit, the second magnetic conductive plate portion is fixedly connected to the magnetic core of the second stator unit, and the rotating shaft is rotatably disposed through the first magnetic conductive plate portion and the second magnetic conductive plate portion.

[0016] In one embodiment, the distance between the two limiting surfaces is defined as a first distance, and the distance between the stop surfaces of the two stop members is defined as a second distance, the difference between the first distance and the second distance is 0.01 mm to 0.02 mm.

[0017] In one embodiment, the housing assembly includes a pump housing and a bushing fixed within the pump housing, the bushing having the shaft hole and the limiting surface located on the bushing.

[0018] In one embodiment, there are two bushings and two stops. The two stops, the two bushings, and the rotor are all arranged along the axis of the rotating shaft. The two stops are located between the two bushings. The limiting surface of each bushing is opposite to the stopping surface of one of the stops. The stopping surfaces of the two stops can respectively abut against the two limiting surfaces to restrict the movement of the rotating shaft in the axial direction of the rotating shaft. The rotor is located between the two stops.

[0019] The rotating shaft has a connecting end for fixed connection with the impeller. The housing assembly also includes a fixing member fixed inside the pump housing. The fixing member has a mounting groove and a fluid channel communicating with the mounting groove. One of the two bushings, the bushing furthest from the connecting end of the rotating shaft, is defined as the proximal bushing. The proximal bushing is installed in the mounting groove. There is a gap between the hole wall of the shaft hole of the proximal bushing and the rotating shaft for fluid flow. The gap communicates with the fluid channel.

[0020] In one embodiment, a fluid clearance portion is provided on the peripheral wall of the rotating shaft or the proximal bushing, the fluid clearance portion being capable of increasing the width of the gap.

[0021] And / or, the mounting groove has a groove bottom, one opening of the fluid channel is located at the groove bottom, and the mounting groove is also provided with a support step, the support step abutting against the side of the proximal bushing opposite to the limiting surface of the proximal bushing, so that the proximal bushing is spaced apart from the groove bottom by a certain distance.

[0022] A blood pump includes an impeller and a drive device as described in any of the preceding claims, wherein the impeller is fixedly connected to the rotating shaft.

[0023] One technical effect of an embodiment of the present invention is that: as the core component of the drive device, the rotor comes into contact with the housing assembly during rotation, resulting in wear. The wear of the rotor affects the normal operation of the drive device and the blood pump, reducing their safety and ultimately adversely affecting the patient's health. The aforementioned drive device, by setting a stop between the rotor and the limiting surface, allows the stop surface of the stop to abut against the limiting surface to restrict the movement of the shaft in the axial direction of the shaft. Furthermore, at least one of the stop surface and the limiting surface has a roughness of less than or equal to 0.1 micrometers. This ensures that when the shaft moves axially, the contact between the stop surface and the limiting surface replaces the direct contact between the rotor and the housing assembly, avoiding the severe wear caused by the direct contact between the core component of the blood pump, the rotor, and the housing assembly in the traditional method. Moreover, because at least one of the stop surface and the limiting surface has a roughness of less than or equal to 0.1 micrometers, the friction between the stop and the housing assembly is small, further reducing the wear problem of the stop and the housing assembly. Attached Figure Description

[0024] Figure 1 A three-dimensional structural diagram of a blood pump according to one embodiment;

[0025] Figure 2 for Figure 1 A partial cross-sectional view of the blood pump shown;

[0026] Figure 3 for Figure 2 Enlarged view of section I of the blood pump shown;

[0027] Figure 4 for Figure 1 The diagram shown is an exploded view of the blood pump, omitting the cannula assembly, impeller, and part of the catheter.

[0028] Figure 5 for Figure 1 An exploded view of the rotor, stop, bushing, and shaft of the blood pump drive unit shown.

[0029] Figure 6 for Figure 5 A cross-sectional view showing the rotor, stop, bushing, and shaft assembled together;

[0030] Figure 7 for Figure 1 A schematic diagram of the first half of the pump housing of the blood pump drive device shown.

[0031] Figure 8 Another cross-sectional view of the blood pump shown in Figure 1, omitting the cannula assembly and catheter;

[0032] Figure 9 for Figure 1 A cross-sectional view of the fixing component of the blood pump drive unit shown;

[0033] Figure 10 for Figure 9 The shown is a sectional view of the fastener with the second bushing installed.

[0034] Figure 11 for Figure 1 The diagram shows the structure of the first stator unit of the blood pump drive device. Detailed Implementation

[0035] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0036] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "inner," "outer," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0037] In this paper, "proximal end" is defined as the end closer to the operator, and "distal end" is defined as the end farther from the operator.

[0038] See Figure 1 According to one embodiment of the present invention, a blood pump 1 includes a drive device 20, a cannula assembly 30, an impeller 40, and a catheter 50. The cannula assembly 30 is connected to the distal end of the drive device 20, and the catheter 50 is connected to the proximal end of the drive device 20. The impeller 40 is rotatably disposed within the cannula assembly 30 and is rotatably connected to the drive device 20. The drive device 20 can drive the impeller 40 to rotate, thereby realizing the blood pumping function of the blood pump 1.

[0039] Specifically, the cannula assembly 30 has an inlet 31 and an outlet 32. The outlet 32 ​​is closer to the drive unit 20 than the inlet 31. That is, the outlet 32 ​​is located at the proximal end of the cannula assembly 30, and the inlet 31 is located at the distal end of the cannula assembly 30. Specifically, the outlet 32 ​​is located on the sidewall of the cannula assembly 30. In one embodiment, the cannula assembly 30 extends through a heart valve, such as an aortic valve, while the inlet 31 is located inside the heart, and the outlet 32 ​​and drive unit 20 are located outside the heart in a blood vessel such as the aorta. When the impeller 40 rotates, blood flows into the cannula assembly 30 from the inlet 31 and then out of the cannula assembly 30 from the outlet 32 ​​to enter a blood vessel such as the aorta.

[0040] The conduit 50 is connected to the end of the drive unit 20 that is away from the sleeve assembly 30. The conduit 50 is used to accommodate various supply lines, such as flushing lines for introducing flushing fluid into the drive unit 20, wires for supplying power to the drive unit 20, and support components for supporting the conduit 50.

[0041] Please refer to both together. Figure 2The drive unit 20 includes a housing assembly 100, a rotating shaft 200, a rotor 300, and a stator 400. A portion of the rotating shaft 200 is housed within the housing assembly 100, and a portion extends outside the housing assembly 100 for fixed connection with the impeller 40; the rotating shaft 200 is rotatable relative to the housing assembly 100; both the rotor 300 and the stator 400 are housed within the housing assembly 100; the rotor 300 is fixed to the rotating shaft 200, and the rotor 300 is rotatable relative to the housing assembly 100, so that the rotor 300 can drive the rotating shaft 200 to rotate; the stator 400 can drive the rotor 300 to rotate.

[0042] The housing assembly 100 is generally cylindrical. The housing assembly 100 is fixedly connected to the sleeve assembly 30 and the conduit 50, respectively. The housing assembly 100 has a shaft hole 101 and a limiting surface 102. The shaft hole 101 allows the rotating shaft 200 to rotatably pass through, limiting the radial swing range of the rotating shaft 200. The limiting surface 102 limits the movement range of the rotating shaft 200 along its axis. The shaft hole 101 is generally circular. The limiting surface 102 is perpendicular to the central axis of the shaft hole 101. Specifically, the limiting surface 102 is an annular surface, and the central axis of the shaft hole 101 passes through the center of the limiting surface 102.

[0043] Please combine them together Figures 2 to 6 In the illustrated embodiment, the housing assembly 100 includes a pump housing 110 and a bushing, with the bushing fixedly connected to the pump housing 110; a shaft hole 101 is formed on the bushing, and a limiting surface 102 is located on the bushing. In some embodiments, the pump housing 110 and the bushing can be separate before assembly, and can be fixedly connected by adhesive bonding during assembly; in some embodiments, the pump housing 110 and the bushing can also be integrally formed before assembly.

[0044] In the illustrated embodiment, the pump housing 110 is generally cylindrical. The pump housing 110 is fixedly connected to the sleeve assembly 30 and the conduit 50, respectively. The pump housing 110 is made of metal, ceramic, plastic, or the like.

[0045] In the illustrated embodiment, there are two bushings, designated as first bushing 121 and second bushing 122. Both first bushing 121 and second bushing 122 are fixedly housed within the pump housing 110. First bushing 121 and second bushing 122 are coaxially arranged. First bushing 121 is located at the end of the pump housing 110 near the sleeve assembly 30, and second bushing 122 is located at the end of the pump housing 110 near the conduit 50. Alternatively, first bushing 121 is the distal bushing, and second bushing 122 is the proximal bushing.

[0046] Both the first bushing 121 and the second bushing 122 have shaft holes 101, and both the first bushing 121 and the second bushing 122 have limiting surfaces 102, i.e., there are two limiting surfaces 102. The limiting surfaces 102 of the first bushing 121 and the limiting surfaces 102 of the second bushing 122 are spaced apart and opposite to each other. Specifically, the shaft hole 101 of the first bushing 121 passes through the limiting surface 102 of the first bushing 121 and the side of the first bushing 121 that is opposite to the limiting surface 102; the shaft hole 101 of the second bushing 122 passes through the limiting surface 102 of the second bushing 122 and the side of the second bushing 122 that is opposite to the limiting surface 102.

[0047] Please refer to the following: Figure 7 Specifically, a limiting protrusion 111 is provided on the inner wall of the pump housing 110. The first bushing 121 abuts against the limiting protrusion 111. By providing the limiting protrusion 111, the first bushing 121 is limited so that it is positioned within the pump housing 110. In the illustrated embodiment, the limiting protrusion 111 abuts against the limiting surface 102 of the first bushing 121. The limiting protrusion 111 is arranged around the central axis of the shaft hole 102 of the first bushing 121.

[0048] Please combine them together Figure 2 , Figure 4 , Figure 7 and Figure 8 Specifically, the housing assembly 100 also includes a fixing member 130, which is fixed inside the pump housing 110. The fixing member 130 has a mounting groove 132 and a fluid channel 134 communicating with the mounting groove 132, and the second bushing 122 is installed in the mounting groove 132. The end of the fluid channel 134 furthest from the mounting groove 132 is used to communicate with the flushing line of the conduit 50, so that flushing fluid can flow into the pump housing 110 through the fluid channel 134.

[0049] Specifically, to facilitate the assembly and positioning of the fixing member 130, one of the fixing member 130 and the pump housing 110 is provided with a positioning protrusion 135, and the other is provided with a positioning groove 1101 that mates with the positioning protrusion 135. In the illustrated embodiment, the fixing member 130 is provided with a positioning protrusion 135, and the positioning groove 1101 is provided on the pump housing 110.

[0050] The rotating shaft 200 is rotatably inserted through the shaft hole 101. Specifically, part of the rotating shaft 200 is housed within the pump housing 110, and part extends out of the pump housing 110 and is fixedly connected to the impeller 40; the rotating shaft 200 is rotatably inserted through the shaft hole 101 of the first shaft sleeve 121 and the shaft hole 101 of the second shaft sleeve 122. The end of the rotating shaft 200 used for fixed connection to the impeller 40 is defined as the connecting end 210. The connecting end 210 is located within the sleeve assembly 30 and fixedly connected to the impeller 40. The first shaft sleeve 121 is closer to the connecting end 210 than the second shaft sleeve 122.

[0051] Specifically, there is a gap between the rotating shaft 200 and the wall of the shaft hole 101 of the first bushing 121 for fluid flow, referred to as the first gap; there is also a gap between the rotating shaft 200 and the wall of the shaft hole 101 of the second bushing 122 for fluid flow, referred to as the second gap. The second gap communicates with the fluid channel 134 so that the flushing fluid introduced from the flushing line of the conduit 50 flows out of the housing assembly 100 sequentially through the fluid channel 134, the shaft hole 101 of the second bushing 122, and the shaft hole 101 of the first bushing 121.

[0052] Please refer to it again. Figure 4 and Figure 5 Specifically, a fluid clearance portion 220 is provided on the peripheral wall of the rotating shaft 200. The fluid clearance portion 220 can increase the width of the second gap, that is, at the fluid clearance portion 220, there is a larger gap width between the rotating shaft 200 and the hole wall of the shaft hole 101 of the second bushing 122. In the illustrated embodiment, the fluid clearance portion 220 is a planar structure provided on the peripheral wall of the rotating shaft 200, and the shaft hole 101 of the second bushing 122 is a circular hole. Specifically, there are two fluid clearance portions 220, which are symmetrically arranged with respect to the axis of the rotating shaft 200. It can be understood that there can also be one or more fluid clearance portions 220, and the number of fluid clearance portions 220 can be set as needed. In order to ensure the stability of the rotating shaft 200, the fluid clearance portion 220 occupies an appropriate circumferential area of ​​the entire rotating shaft 200.

[0053] It is understood that the fluid clearance portion 220 is not limited to being disposed on the rotating shaft 200. In other embodiments, the fluid clearance portion 220 may also be a hole structure opened on the second bushing 122. For example, the fluid clearance portion 220 is formed by the recess of the hole wall of the shaft hole 101. The fluid clearance portion 220 extends along the axis of the second bushing 122 and penetrates two opposing surfaces in the axial direction of the second bushing 122, and the fluid clearance portion 220 communicates with the shaft hole 101 of the second bushing 122.

[0054] Please combine Figure 8 , Figure 9 and Figure 10 Specifically, the mounting groove 132 has a groove bottom 132a, and an opening of the fluid channel 134 is located at the groove bottom 132a. A support step 136 is also provided inside the mounting groove 132, which abuts against the second bushing 122 to create a distance between the second bushing 122 and the groove bottom 132a, thereby better ensuring the smooth flow of the flushing fluid. Specifically, the support step 136 abuts against the side of the second bushing 122 that faces away from the limiting surface 102 of the second bushing 122.

[0055] Please refer to it again. Figure 2 , Figure 4 , Figure 5 and Figure 6 The rotor 300 is rotatably housed within the pump housing 110. In the illustrated embodiment, the rotor 300 includes a first rotor unit 310 and a second rotor unit 320, both of which are fixed to the rotating shaft 200. Both the first rotor unit 310 and the second rotor unit 320 are rotatably housed within the pump housing 110. The first rotor unit 310 and the second rotor unit 320 are both located between two limiting surfaces 102. That is, the first rotor unit 310, the second rotor unit 320, the first bushing 121, and the second bushing 122 are arranged along the axis of the rotating shaft 200, with the first rotor unit 310 positioned closer to the first bushing 121 and the second rotor unit 320 positioned closer to the second bushing 122.

[0056] The stator 400 is fixedly housed within the pump casing 110, and the rotating shaft 200 rotatably passes through the stator 400. Specifically, the stator 400 includes a first stator unit 410 and a second stator unit 420 arranged along the axis of the rotating shaft 200. The first stator unit 410 can drive the first rotor unit 310 to rotate, and the second stator unit 420 can drive the second rotor unit 320 to rotate. Both the first stator unit 410 and the second stator unit 420 are fixedly housed within the pump casing 110. The rotating shaft 200 rotatably passes through the first stator unit 410 and the second stator unit 420. The first stator unit 410 and the second stator unit 420 are both located between the first rotor unit 310 and the second rotor unit 320. Therefore, the first rotor unit 310 is located between the first stator unit 410 and the first bushing 121, and the second rotor unit 320 is located between the second stator unit 320 and the second bushing 121. In other words, the first bushing 121, the first rotor unit 310, the first stator unit 410, the second stator unit 420, the second rotor unit 320, and the second bushing 121 are arranged sequentially along the axis of the rotating shaft 200, wherein the first bushing 121 is closest to the connecting end 210 of the rotating shaft 200.

[0057] Specifically, both the first rotor unit 310 and the second rotor unit 320 are magnetic, the first stator unit 410 can generate a rotating magnetic field that drives the first rotor unit 310 to rotate, and the second stator unit 420 can generate a rotating magnetic field that drives the second rotor unit 320 to rotate.

[0058] Specifically, the first rotor unit 310 includes a first magnet 311, which is fixedly connected to the rotating shaft 200. The first magnet 311 is a ring-shaped Helbeck array magnet. The first magnet 311 includes multiple first magnetic units 3111, each first magnetic unit 3111 being fan-shaped, and the multiple first magnetic units 3111 are arranged around the rotating shaft 200 to form a ring structure. Specifically, the number of first magnetic units 3111 can be four, six, eight, or ten, etc.

[0059] The first rotor unit 310 also includes a first flywheel 312, which is fixedly connected to the rotating shaft 200, and a first magnet 311 is fixedly connected to the first flywheel 312. By setting the first flywheel 312, the connection strength between the first magnet 311 and the rotating shaft 200 can be enhanced; in addition, the shaking of the rotating shaft 200 during rotation can be reduced, making the entire rotating shaft 200 more stable during rotation.

[0060] Specifically, the first flywheel 312 includes a first internal tube 3121, a first disc-shaped portion 3122, and a first outer ring wall 3123. Both the first internal tube 3121 and the first outer ring wall 3123 are cylindrical structures, and the first disc-shaped portion 3122 is an annular disc structure. The first internal tube 3121 and the first outer ring wall 3123 are both fixedly connected to the first disc-shaped portion 3122. The first outer ring wall 3123 surrounds the first disc-shaped portion 3122. The first internal tube 3121 and the first outer ring wall 3123 are coaxially arranged. The rotating shaft 200 passes through the first internal tube 3121 and is fixedly connected to it. A first mounting cavity is formed between the first internal tube 3121 and the first outer ring wall 3123. The first mounting cavity is an annular cavity. A first magnet 311 is housed in the first mounting cavity. The shape of the first mounting cavity is adapted to the first magnet 311 to facilitate the installation and positioning of the first magnet 311. This configuration allows the first flywheel 312 to limit the first magnet 311, which not only facilitates the installation of the first magnet 311, but also makes the connection between the first magnet 311 and the first flywheel 312 more stable.

[0061] It should be noted that the first flywheel 312 is not limited to the structure described above. In some embodiments, the first flywheel 312 does not have a first outer ring wall 3123; in some embodiments, the first flywheel 312 does not have a first outer ring wall 3123 and a first internal tube 3121. In this case, the shaft 200 is fixedly inserted through the center of the first disc-shaped portion 3122. Compared to a first flywheel 312 that only has a first disc-shaped portion 3122, providing a first internal tube 3121 allows for a more stable connection between the first flywheel 312 and the shaft 200.

[0062] The second rotor unit 320 includes a second magnet 321, which is fixed to the rotating shaft 200. Specifically, the second magnet 321 is a ring-shaped Helbeck array magnet. The second magnet 321 includes multiple second magnetic units 3211, each second magnetic unit 3211 being fan-shaped, and the multiple second magnetic units 3211 are arranged around the rotating shaft 200 to form a ring structure. Specifically, the number of second magnetic units 3211 is four, six, eight, or ten, etc.

[0063] The second rotor unit 320 also includes a second flywheel 322, which is fixedly connected to the rotating shaft 200, and the second magnet 321 is fixed to the second flywheel 322. By setting the second flywheel 322, the connection strength between the second magnet 321 and the rotating shaft 200 can be enhanced; in addition, the shaking of the rotating shaft 200 during rotation can be reduced, making the entire rotating shaft 200 more stable during rotation.

[0064] The second flywheel 322 includes a second internal tube 3221, a second disc-shaped portion 3222, and a second outer ring wall 3223. Both the second internal tube 3221 and the second outer ring wall 3223 are cylindrical structures, and the second disc-shaped portion 3222 is an annular disc structure. The second internal tube 3221 and the second outer ring wall 3223 are both fixedly connected to the second disc-shaped portion 3222. The second outer ring wall 3223 surrounds the second disc-shaped portion 3222. The second internal tube 3221 and the second outer ring wall 3223 are coaxially arranged. A rotating shaft 200 passes through the second internal tube 3221 and is fixedly connected to it. A second mounting cavity is formed between the second internal tube 3221 and the second outer ring wall 3223. The second mounting cavity is an annular cavity. The second magnet 321 is housed in the second mounting cavity. The shape of the second mounting cavity is adapted to the second magnet 321 to facilitate the installation and positioning of the second magnet 321. This configuration allows the second flywheel 322 to limit the second magnet 321, which not only facilitates the installation of the second magnet 321, but also makes the connection between the second magnet 321 and the second flywheel 322 more stable.

[0065] It should be noted that the second flywheel 322 is not limited to the structure described above. In some embodiments, the second flywheel 322 does not have a second outer ring wall 3223; in some embodiments, the second flywheel 322 does not have a second outer ring wall 3223 and a second internal tube 3221. In this case, the shaft 200 is fixedly inserted through the center of the second disc-shaped portion 3222. Compared to a second flywheel 322 that only has a second disc-shaped portion 3222, providing a second internal tube 3221 allows for a more stable connection between the second flywheel 322 and the shaft 200.

[0066] Please combine them together Figure 11The first stator unit 410 and the second stator unit 420 both include a magnetic core and a coil, with the coil wound around the magnetic core. Specifically, the first stator unit 410 includes a first magnetic core 412 and a first coil 413, with the first coil 413 wound around the first magnetic core 412. There are multiple first magnetic cores 412, arranged around the axis of the rotating shaft 200. Each first magnetic core 412 has a first coil 413.

[0067] In some embodiments, each first magnetic core 412 includes a magnetic post and a head (i.e., a pole shoe) disposed at one end of the magnetic post. The extension direction of the magnetic post is consistent with the extension direction of the rotating shaft 200. A first coil 413 is wound around the magnetic post of each first magnetic core 412. The magnetic post is generally a uniformly sized column in the extension direction, meaning the cross-sectional dimensions of the magnetic post remain constant; in simpler terms, the magnetic post is of uniform thickness. In some embodiments, the first magnetic core 412 only includes a magnetic post, meaning that none of the first magnetic cores 412 have a wide head (i.e., a pole shoe). In this case, the entire first magnetic core 412 can be magnetically coupled to the first rotor unit 310. Compared to a first magnetic core 412 with a head, a first magnetic core 412 with only a magnetic post can reduce magnetic losses and increase the magnetic coupling density between the first magnetic core 412 and the first rotor unit 310, thereby increasing the torque of the first stator unit 410 on the first rotor unit 310 under the same current. On the other hand, the absence of a head in the first magnetic core 412 can also greatly reduce the problem of power reduction in the drive device 20 caused by local magnetic short circuits due to contact between adjacent first magnetic cores 412.

[0068] The cross-sectional shape of the magnetic pillars of the first magnetic core 412 is approximately triangular prism, with one edge of each pillar facing the axis of the rotation shaft 200. In some embodiments, the edges of the magnetic pillars are rounded, i.e., the edges are relatively smooth and blunt rounded, thereby eliminating sharp corners on the magnetic pillars. This not only facilitates the subsequent winding of the first coil 413 but also helps protect the insulating material covering the first coil 413. In other embodiments, the cross-sectional shape of the magnetic pillars of the first magnetic core 412 can also be fan-shaped, circular, trapezoidal, annular, etc.

[0069] The structure of the second stator unit 420 is similar to that of the first stator unit 410. The second stator unit 420 includes a second magnetic core 422 and a second coil 423, with the second coil 423 wound around the second magnetic core 422. There are multiple second magnetic cores 422, arranged around the axis of the rotating shaft 200. Each second magnetic core 422 has one second coil 423.

[0070] In some embodiments, each second magnetic core 422 includes a magnetic post and a head (i.e., a pole shoe) disposed at one end of the magnetic post. The extension direction of the magnetic post is consistent with the extension direction of the rotating shaft 200. The second coil 423 is wound around the magnetic post of each second magnetic core 422. The magnetic post is generally a uniformly sized column in the extension direction, meaning the cross-sectional dimensions of the magnetic post remain constant; in simpler terms, the magnetic post is of uniform thickness. In some embodiments, the second magnetic core 422 only includes a magnetic post, meaning that none of the second magnetic cores 422 have a wide head (i.e., a pole shoe). In this case, the entire second magnetic core 422 can be magnetically coupled to the second rotor unit 320. Compared to a second magnetic core 422 with a head, a second magnetic core 422 with only a magnetic post can reduce magnetic losses and increase the magnetic coupling density between the second magnetic core 422 and the second rotor unit 320, thereby increasing the torque of the second stator unit 420 on the second rotor unit 320 under the same current. On the other hand, the absence of a head in the second magnetic core 422 can also greatly reduce the problem of power reduction in the drive device 20 caused by local magnetic short circuits due to contact between adjacent second magnetic cores 422.

[0071] The cross-sectional shape of the magnetic pillars of the second magnetic core 422 is approximately triangular prism, with one edge of each pillar facing the axis of the rotating shaft 200. In some embodiments, the edges of the magnetic pillars are rounded, i.e., the edges are relatively smooth and blunt rounded, thereby eliminating sharp corners on the magnetic pillars. This not only facilitates the subsequent winding of the second coil 423 but also helps protect the insulating material covering the second coil 423. In other embodiments, the cross-sectional shape of the magnetic pillars of the second magnetic core 422 can also be fan-shaped, circular, trapezoidal, annular, etc.

[0072] Please combine Figure 2 Specifically, the drive unit 20 further includes a magnetic guide 500 fixedly connected to the housing assembly 100. The first magnetic core 412 of the first stator unit 410 and the second magnetic core 422 of the second stator unit 420 are both fixedly connected to the magnetic guide 500. Specifically, the magnetic guide 500 is fixedly housed within the pump housing 110. The rotating shaft 200 is rotatably disposed through the magnetic guide 500. If the first magnetic core 412 has a head, the end of the first magnetic core 412 away from the head is fixedly connected to the magnetic guide 500, and the first rotor unit 310 is disposed close to the head of the first magnetic core 412; if the second magnetic core 422 has a head, the end of the second magnetic core 422 away from the head is fixedly connected to the magnetic guide 500, and the second rotor unit 320 is disposed close to the head of the second magnetic core 422. If the first magnetic core 412 has no head, one end of the first magnetic core 412 is fixedly connected to the magnetic conductor 500, and the first rotor unit 310 is located near the other end of the first magnetic core 412; if the second magnetic core 422 has no head, one end of the second magnetic core 423 is fixedly connected to the magnetic conductor 500, and the second rotor unit 320 is located near the other end of the second magnetic core 422.

[0073] The magnetic conductor 500 serves to close the magnetic circuit, promoting and increasing the generation of magnetic flux and improving coupling capability. Therefore, by fixing the first magnetic core 412 of the first stator unit 410 and the second magnetic core 422 of the second stator unit 420 to the magnetic conductor 500, the magnetic circuit between the first stator unit 410 and the first rotor unit 310, and between the second stator unit 420 and the second rotor unit 320, is closed, increasing the magnetic flux. Thus, the magnetic conductor 500 helps to reduce the overall diameter of the drive device 20. Furthermore, fixing the first magnetic core 412 of the first stator unit 410 and the second magnetic core 422 of the second stator unit 420 to the magnetic conductor 500 also enables the positioning and installation of the first stator unit 410 and the second stator unit 420, reducing the assembly difficulty of the first stator unit 410 and the second stator unit 420. Meanwhile, the magnetic guide 500 provided above can also reduce the number of positioning structures inside the pump housing 110, thereby simplifying the structure of the pump housing 110 and simplifying the assembly process of the entire drive device 20.

[0074] Please combine them together Figure 7 Specifically, the inner wall of the pump housing 110 is provided with a slot 112, which can engage with the magnetic conductor 500 to position the magnetic conductor 500 inside the pump housing 110, and position the first stator unit 410 and the second stator unit 420 inside the pump housing 110. Thus, by engaging the magnetic conductor 500 in the slot 112, it can be quickly and securely installed into the pump housing 110.

[0075] Please combine them together Figure 4 In the illustrated embodiment, the pump housing 110 includes a first half-shell 113 and a second half-shell 114 spliced ​​with the first half-shell 113. Both the first half-shell 113 and the second half-shell 114 are provided with slots 112, which engage with opposite side edges of the magnetic conductor 500, thus positioning the magnetic conductor 500 within the pump housing 110. Specifically, the first half-shell 113 and the second half-shell 114 are approximately symmetrical with respect to the axial cross-section of the pump housing 110. By splicing the first half-shell 113 and the second half-shell 114, interference can be reduced to a certain extent, improving the assembly efficiency and accuracy of the drive device 20. It is understood that in other embodiments, the entire pump housing 110 can be a one-piece molded structure.

[0076] Specifically, the magnetic conductive component 500 includes a first magnetic conductive plate portion 510 and a second magnetic conductive plate portion 520. The first magnetic conductive plate portion 510 is fixedly connected to the first magnetic core 412 of the first stator unit 410, and the second magnetic conductive plate portion 520 is fixedly connected to the second magnetic core 422 of the second stator unit 420. The first magnetic conductive plate 510 and the second magnetic conductive plate 520 are stacked, and the rotating shaft 200 is rotatably inserted through the first magnetic conductive plate portion 510 and the second magnetic conductive plate portion 520. The edges of the first magnetic conductive plate portion 510 and the second magnetic conductive plate portion 520 are engaged with the slots 112. Specifically, the first magnetic plate portion 510 and the second magnetic plate portion 520 are separate units before assembly. By setting the magnetic component 500 to be a separate first magnetic plate portion 510 and second magnetic plate portion 520 before assembly, when assembling the drive device 20, the first magnetic core 412 can be fixed to the first magnetic plate portion 510 and the second magnetic core 422 can be fixed to the second magnetic plate portion 520 firstly, and then the first magnetic plate portion 510 and the second magnetic plate portion 520 can be stacked. In this way, the first magnetic core 412 and the second magnetic core 422 can be easily assembled onto the first magnetic plate portion 510 and the second magnetic plate portion 520 respectively, making the assembly of the first magnetic core 412 and the second magnetic core 422 more convenient.

[0077] Specifically, the first magnetic plate portion 510 and the second magnetic plate portion 520 are fixedly connected, thereby enabling the first stator unit 410, the second stator unit 420, and the magnetic conductor 500 to form a whole and be assembled into the pump housing 110, making the assembly of the stator 400 easier. Specifically, the first magnetic plate portion 510 and the second magnetic plate portion 520 are bonded or welded together. In some embodiments, the first magnetic plate portion 510 and the second magnetic plate portion 520 are not fixedly connected together. In this case, the surfaces of the first magnetic plate portion 510 and the second magnetic plate portion 520 that are close to each other abut against each other and are engaged together in the slot 112.

[0078] It should be noted that the magnetic conductor 500 is not limited to the above-mentioned combination of the separate first magnetic conductor plate 510 and the second magnetic conductor plate 520. The magnetic conductor 500 can also be a plate-shaped structure, with the first magnetic core 412 and the second magnetic core 422 both connected to the magnetic conductor 500, that is, the first stator unit 410 and the second stator unit 420 share a magnetic conductor 500.

[0079] Specifically, the first magnetic plate portion 510 and the second magnetic plate portion 520 are made of silicon steel, and the first magnetic core 412 and the second magnetic core 422 are made of silicon steel.

[0080] Please combine them together Figures 2 to 6Specifically, the drive device 20 also includes a stop member 600, which is fixedly connected to at least one of the rotor 300 and the rotating shaft 200. That is, the stop member 600 can be directly fixed only to the rotor 300, only to the rotating shaft 200, or simultaneously contacting and fixed to both the rotor 300 and the rotating shaft 200. Since the rotor 300 is fixed to the rotating shaft 200, the stop member 600, the rotating shaft 200, and the rotor 300 rotate synchronously. The stop member 600 is located between the rotor 300 and the limiting surface 102. The stop member 600 has a stop surface 610, which faces the limiting surface 102 and can abut against the limiting surface 102 to restrict the movement of the rotating shaft 200 in the axial direction of the rotating shaft 200. Specifically, the stop member 600, the rotor 300, and the limiting surface 102 are arranged along the axis of the rotating shaft 200.

[0081] In the illustrated embodiment, there are two stop members 600. One stop member 600 is disposed between the first rotor unit 310 and a limiting surface 102, and another stop member 600 is disposed between the second rotor unit 320 and another limiting surface 102. The stopping surfaces 610 of the two stop members 600 are respectively opposite to the two limiting surfaces 102, and the stopping surfaces 610 of the two stop members 600 can respectively abut against the two limiting surfaces 102 to restrict the movement of the rotating shaft 200 in the axial direction of the rotating shaft 200. That is, one stop member 600 is disposed between the first bushing 121 and the first rotor unit 310, and the other stop member 600 is disposed between the second bushing 122 and the second rotor unit 320. Both stop members 600 have stop surfaces 610, which are respectively opposite to the limiting surfaces 102 of the first bushing 121 and the second bushing 122. The stop surfaces 610 of the two stop members 600 can abut against the limiting surfaces 102 of the first bushing 121 and the second bushing 122 to restrict the movement of the rotating shaft 200 along its axial direction. One stop member 600 is fixedly connected to the first flywheel 312 of the first rotor unit 310, and the other stop member 600 is fixedly connected to the second flywheel 322 of the second rotor unit 320.

[0082] Since the inner wall of the pump housing 110 is provided with a limiting protrusion 111 for abutting against the limiting surface 102 of the first bushing 121, the thickness of the stop member 600 located between the first rotor unit 310 and the first bushing 121 along the axial direction of the rotating shaft 200 is greater than the thickness of the limiting protrusion 111, so as to avoid the first rotor unit 310 from contacting the side of the limiting protrusion 111 that is away from the limiting surface 102 of the first bushing 121 and / or the pump housing 110.

[0083] Specifically, the stop member 600 has a ring-shaped structure, and its central axis coincides with the axis of the rotating shaft 200. One side of the stop member 600 facing away from the limiting surface 102 is fixedly connected to the first flywheel 312 (specifically, the first disc-shaped portion 3122), and the other side of the stop member 600 facing away from the limiting surface 102 is fixedly connected to the second flywheel 322 (specifically, the second disc-shaped portion 3222). In the illustrated embodiment, the stop member 600 is a closed ring-shaped structure. The stop surface 610 is an annular surface, and the axis of the rotating shaft 200 passes through the center of the stop surface 610. In other embodiments, the stop member 600 may also be composed of multiple fan-shaped rings arranged at uniform intervals around the rotating shaft 200, or it can be understood as being composed of multiple fan-shaped rings arranged discretely in a circumferential direction.

[0084] Specifically, the stop surface 610 is perpendicular to the axis of the rotating shaft 200, and since the limiting surface 102 is perpendicular to the central axis of the shaft hole 101, the stop surface 610 is made as parallel as possible to the limiting surface 102.

[0085] In this embodiment, the roughness of at least one of the stop surface 610 and the limiting surface 102 is less than or equal to 0.1 micrometers. In some embodiments, the roughness of both the stop surface 610 and the limiting surface 102 is less than or equal to 0.1 micrometers. In some embodiments, the roughness of one of the stop surface 610 and the limiting surface 102 is less than or equal to 0.1 micrometers. By reducing the roughness of at least one of the stop surface 610 and the limiting surface 102, the frictional force between the stop surface 610 and the limiting surface 102 can be effectively reduced, thereby reducing the wear of the housing assembly 100 and the stop member 600.

[0086] As a core component of the drive unit 20, the wear of the rotor 300 affects the normal operation of the drive unit 20 and the blood pump 1, reducing their safety and ultimately adversely impacting the patient's health. Typically, the rotor 300 is made of permanent magnet materials and / or metal, while the pump housing 110 is made of metal. Direct contact between the rotor 300 and the bushing and / or pump housing 110 results in significant wear. By incorporating a stop 600, direct contact between the rotor 300 and the bushing and / or pump housing 110 can be effectively prevented when the shaft 200 moves axially, thus preventing wear caused by direct contact and extending the service life of the rotor 300 and / or pump housing 110. In other words, the friction between the stop 600 and the bushing and / or pump housing 110 replaces the direct friction between the rotor 300 and the bushing and / or pump housing 110. Setting the roughness of at least one of the stop surface 610 and the limiting surface 102 to less than or equal to 0.1 micrometers can effectively reduce the friction between the stop surface 610 and the limiting surface 102, thereby reducing the wear of the stop member 600 and the housing assembly 100 and improving the service life of the drive device 20 and the blood pump 1.

[0087] Specifically, both the stop surface 610 and the limiting surface 102 are ceramic surfaces. Specifically, the stop 600, the first bushing 121, and the second bushing 122 are all made of ceramic. Ceramic has high processing precision, high biocompatibility, high mechanical strength, and good wear resistance and corrosion resistance. In other embodiments, one of the stop surface 610 and the limiting surface 102 is a ceramic surface.

[0088] Specifically, the distance between the limiting surface 102 of the first bushing 121 and the limiting surface 102 of the second bushing 122 is defined as the first distance H, that is, the distance between the two limiting surfaces 102 is H. The distance between the stop surfaces 610 of the two stop members 600 is defined as the second distance h. The difference between the first distance H and the second distance h is 0.01mm to 0.02mm, so that the rotating part of the drive device 20 has a certain floating space, that is, clearance, between the first bushing 121 and the second bushing 122, so that the flushing fluid can enter between the limiting surface 102 and the stop surface 610 to play a lubricating role and to suspend the rotating part, thereby reducing the friction coefficient between the limiting surface 102 and the stop surface 610, thereby reducing the friction between the limiting surface 102 and the stop surface 610, and improving the smoothness of the flushing fluid flow. However, if the difference between the first spacing H and the second spacing h is too large, it will cause the rotating part to swing too much axially. Controlling the difference between the first spacing H and the second spacing h to 0.01mm to 0.02mm can control the rotating part within a reasonable range of axial swing, reduce the friction between the limiting surface 102 and the stop surface 610, and make the flow of flushing fluid smoother.

[0089] Specifically, a partial recess in the limiting surface 102 of the first bushing 121 forms a first guide groove 1214. The first guide groove 1214 extends radially along the first bushing 121 and communicates with the shaft hole 102 of the first bushing 121, thereby communicating with the first gap. The number of first guide grooves 1214 can be at least two, and all first guide grooves 1214 are evenly spaced along the circumference of the first bushing 121. The flushing fluid can enter the first gap through the first guide groove 1214. This arrangement not only allows the flushing fluid to flow better between the limiting surface 102 of the first bushing 121 and the stop surface 610 of the stop member 600, thus achieving a lubricating effect, reducing the coefficient of friction between the limiting surface 102 and the stop surface 610, reducing the frictional force between them, and reducing the wear of the first bushing 121 and the stop member 600, but also the first guide groove 1214 can improve the smoothness of the flushing fluid flow in the pump housing 110.

[0090] Similarly, a partial recess in the limiting surface 102 of the second bushing 122 forms a second guide groove 1224. The second guide groove 1224 extends radially along the second bushing 122 and communicates with the shaft hole 101 of the second bushing 122, thereby communicating with the second gap. The number of second guide grooves 1224 can be at least two, and all second guide grooves 1224 are evenly spaced along the circumference of the second bushing 122. Flushing fluid can flow from the second gap into the pump housing 110 through the second guide groove 1224. This arrangement not only allows the flushing fluid to flow better between the limiting surface 102 of the second bushing 122 and the stop surface 610 of the stop member 600, thus achieving a lubricating effect, reducing the coefficient of friction between the limiting surface 102 and the stop surface 610, reducing the frictional force between them, and reducing the wear of the second bushing 122 and the stop member 600, but also the second guide groove 1224 can improve the smoothness of the flushing fluid flow in the pump housing 110.

[0091] Specifically, the rotating shaft 200 also includes a first thick section 230 and a first thin section 240 connected together, with the outer diameter of the first thick section 230 being larger than the outer diameter of the first thin section 240. The first thick section 230 is fixedly inserted into the first rotor unit 1211, and the first thin section 240 is rotatably inserted into the shaft hole 101 of the first bushing 121. The connection between the first thick section 230 and the first thin section 240 is located within the stop member 600 between the first rotor unit 310 and the first bushing 121, so that there is a gap space 242 between the stop member 600 and the first thin section 240. The gap space 242 is filled with adhesive, which fixes the stop member 600 to the rotating shaft 200.

[0092] The rotating shaft 200 also includes a second thick section 250 and a second thin section 260, the outer diameter of the second thick section 250 being larger than the outer diameter of the second thin section 260. The second thick section 250 is fixedly inserted into the second rotor unit 320, and the second thin section 260 is rotatably inserted into the shaft hole 101 of the second bushing 122. The connection between the second thick section 250 and the second thin section 260 is located within the stop member 600 between the second rotor unit 320 and the second bushing 122, so that there is a gap between the stop member 600 and the second thin section 260. The gap is filled with adhesive, which fixes the stop member 600 to the rotating shaft 200.

[0093] The aforementioned drive device 20 and blood pump 1 have at least the following advantages:

[0094] (1) As the core component of the drive device 20, the rotor 300 will come into contact with the housing assembly 100 during rotation, resulting in wear. The wear of the rotor 300 will affect the normal operation of the drive device 20 and the blood pump 1, reducing their safety and ultimately adversely affecting the patient's health. The drive device 20 restricts the movement of the rotating shaft 200 in the axial direction of the rotating shaft by setting a stop 600 between the rotor 300 and the limiting surface 102, so that the stop surface 610 of the stop 600 abuts against the limiting surface 102. The roughness of at least one of the stop surface 610 and the limiting surface 102 is less than that of the rotor 300. The roughness is less than or equal to 0.1 micrometers, so that when the rotating shaft 200 moves axially, the contact between the stop surface 610 and the limiting surface 102 replaces the direct contact between the rotor 300 and the housing assembly 100, avoiding the severe wear caused by the direct contact between the core component rotor 300 and the housing assembly 100 in the traditional blood pump. Moreover, since the roughness of at least one of the stop surface 610 and the limiting surface 102 is less than or equal to 0.1 micrometers, the friction between the stop 600 and the housing assembly 100 is small, which not only reduces the wear problem of the stop 600 and the housing assembly 100, but also helps to improve the starting speed of the rotating parts.

[0095] (2) By controlling the difference between the distance between the two limiting surfaces 102 and the distance between the stop surfaces 610 of the two stop parts 600 to 0.01mm to 0.02mm, the entire rotating part has a certain floating space between the two limiting surfaces 102. This not only allows the axial vibration of the rotating part to be reasonably controlled, but also facilitates the entry of flushing fluid between the limiting surfaces 102 and the stop surfaces 610 to play a lubricating role and to suspend the rotating part. This reduces the friction coefficient between the limiting surfaces 102 and the stop surfaces 610, reduces the friction between the limiting surfaces 102 and the stop surfaces 610, and improves the smoothness of the flushing fluid flow.

[0096] (3) By setting the magnetic conductor 500, which is used to close the magnetic circuit between the first stator unit 410 and the first rotor unit 310 and to close the magnetic circuit between the second stator unit 420 and the second rotor unit 320, between the first stator unit 410 and the second stator unit 420, the problem of the high installation difficulty of the traditional drive device 20 can be solved, thereby reducing the installation difficulty of the drive device 20; and by setting the magnetic conductor 500 as the first magnetic conductor plate part 510 and the second magnetic conductor plate part 520, which are separate parts before assembly, the assembly difficulty of the drive device 20 can be further reduced.

[0097] It is understood that the structure of the drive device 20 is not limited to the structure described above. In some embodiments, the stator unit of the stator 400 may also be a single unit. In this case, the drive device 20 may or may not have a magnetic guide 500. When the drive device 20 has a magnetic guide 500, there is a single rotor unit. The stator unit is located between the rotor unit and the magnetic guide 500. The magnetic guide 500 is fixedly connected to the magnetic core of the stator unit. The rotor unit is located on the side of the magnetic core away from the magnetic guide 500 and is spaced apart from the stator unit. In this case, there may still be two limiting surfaces 102. The rotor unit, the stator unit, and the magnetic guide 500 are all located between the two limiting surfaces 102. In this case, a stop 600 may be provided only between the rotor unit and one of the limiting surfaces 102. Alternatively, a stop 600 may also be provided between the magnetic guide 500 and the bushing. That is, there may be one or two stop 600s. When the drive unit 20 does not have a magnetic conductor 500, there can be two rotor units or one rotor unit. When there are two rotor units, the two rotor units are located on both sides of the stator unit and are spaced apart from the stator unit. In this case, there can still be two limiting surfaces 102, with both rotor units and the stator unit located between the two limiting surfaces 102. A stop 600 is provided between each limiting surface 102 and the rotor unit. When there is one rotor unit, the rotor unit and the stator unit are spaced apart along the axis of the shaft 200 and are located between the two limiting surfaces 102 along the shaft 200. When there is one rotor unit, the stop 600 can be provided only between the limiting surfaces 102 closest to the rotor unit, or the stop 600 can also be provided between the stator unit and the other limiting surface 102. That is, there can be one or two stop 600s.

[0098] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0099] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A driving device for driving an impeller to rotate, characterized in that, The driving device includes: The housing assembly has a shaft hole and a limiting surface; A rotating shaft for fixed connection with the impeller, the rotating shaft being rotatably inserted through the shaft hole; The rotor is fixedly connected to the shaft; and A stop member fixedly connected to at least one of the rotor and the shaft, the stop member being located between the rotor and the limiting surface, the stop member having a stop surface opposite to the limiting surface, the stop surface being capable of abutting against the limiting surface to restrict the movement of the shaft in the axial direction of the shaft, and the roughness of at least one of the stop surface and the limiting surface being less than or equal to 0.1 micrometers; The rotating shaft includes a first thick section and a first thin section connected together. The outer diameter of the first thick section is larger than the outer diameter of the first thin section. The connection between the first thick section and the first thin section is located inside the stop member, so that there is a gap space between the stop member and the first thin section. The gap space is filled with adhesive, and the adhesive fixes the stop member to the rotating shaft. The housing assembly includes a pump housing and a first bushing, the first bushing being fixedly connected inside the pump housing; the first bushing has a shaft hole and a limiting surface, the inner wall of the pump housing has a limiting protrusion, the limiting protrusion abuts against the limiting surface of the first bushing, and the thickness of the stop member that abuts against the limiting surface of the first bushing along the axis of rotation is greater than the thickness of the limiting protrusion.

2. The driving device according to claim 1, characterized in that, The roughness of both the stop surface and the limiting surface is less than or equal to 0.1 micrometers; And / or, both the stop surface and the limiting surface are ceramic surfaces; And / or, the limiting surface is perpendicular to the central axis of the shaft hole, and the stop surface is perpendicular to the axis of the rotating shaft.

3. The driving device according to claim 1, characterized in that, The number of limiting surfaces and the number of stop members are both two. The rotor includes a first rotor unit and a second rotor unit arranged along the axis of the rotating shaft. The first rotor unit and the second rotor unit are both fixed to the rotating shaft. The first rotor unit and the second rotor unit are both located between the two limiting surfaces. A stop member is arranged between the limiting surface of the first rotor unit and the first bushing, and another stop member is arranged between the second rotor unit and the other limiting surface. The stop surfaces of the two stop members are respectively opposite to the two limiting surfaces, and the stop surfaces of the two stop members can respectively abut against the two limiting surfaces to restrict the movement of the rotating shaft in the axial direction of the rotating shaft.

4. The driving device according to claim 3, characterized in that, The driving device further includes a first stator unit and a second stator unit arranged along the axis of the rotating shaft. The first stator unit and the second stator unit are both located between the first rotor unit and the second rotor unit. The first stator unit can drive the first rotor unit to rotate, and the second stator unit can drive the second rotor unit to rotate. The first stator unit and the second stator unit both include a magnetic core and a coil, and the coil is wound on the magnetic core. The drive device further includes a magnetic conductor fixed to the housing assembly. The magnetic core of the first stator unit and the magnetic core of the second stator unit are both fixed to the magnetic conductor. The rotating shaft is rotatably disposed through the first stator unit, the second stator unit and the magnetic conductor.

5. The driving device according to claim 4, characterized in that, The magnetic conductive component includes a first magnetic conductive plate portion and a second magnetic conductive plate portion, the second magnetic conductive plate portion and the first magnetic conductive plate portion are stacked, the first magnetic conductive plate portion is fixedly connected to the magnetic core of the first stator unit, the second magnetic conductive plate portion is fixedly connected to the magnetic core of the second stator unit, and the rotating shaft is rotatably disposed through the first magnetic conductive plate portion and the second magnetic conductive plate portion.

6. The driving device according to claim 3, characterized in that, The distance between the two limiting surfaces is defined as the first distance, and the distance between the stop surfaces of the two stop members is defined as the second distance. The difference between the first distance and the second distance is 0.01 mm to 0.02 mm.

7. The driving device according to claim 1, characterized in that, The housing assembly further includes a second bushing, which is fixedly connected to the pump housing. The second bushing also has a shaft hole and a limiting surface. There are two stops, and the two stops, the first bushing, the second bushing, and the rotor are all arranged along the axis of the rotating shaft. The two stops are located between the first bushing and the second bushing. The stopping surfaces of the two stops are respectively opposite to the limiting surfaces of the first bushing and the second bushing. The stopping surfaces of the two stops can respectively abut against the limiting surfaces of the first bushing and the second bushing to restrict the movement of the rotating shaft in the axial direction of the rotating shaft.

8. The driving device according to claim 7, characterized in that, The rotor is located between the two stops; The rotating shaft has a connecting end for fixed connection with the impeller. The housing assembly also includes a fixing member fixed inside the pump housing. The fixing member has a mounting groove and a fluid channel communicating with the mounting groove. One of the two bushings, the bushing furthest from the connecting end of the rotating shaft, is defined as the proximal bushing. The proximal bushing is installed in the mounting groove. There is a gap between the hole wall of the shaft hole of the proximal bushing and the rotating shaft for fluid flow. The gap communicates with the fluid channel.

9. The driving device according to claim 8, characterized in that, The peripheral wall of the rotating shaft or the proximal bushing is provided with a fluid clearance part, which can increase the width of the gap. And / or, the mounting groove has a groove bottom, one opening of the fluid channel is located at the groove bottom, and the mounting groove is also provided with a support step, the support step abutting against the side of the proximal bushing opposite to the limiting surface of the proximal bushing, so that the proximal bushing is spaced apart from the groove bottom by a certain distance.

10. A blood pump, characterized in that, It includes an impeller and a drive device according to any one of claims 1 to 9, wherein the impeller is fixedly connected to the rotating shaft.

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