Drive mechanism and blood pump

Abstract

The drive mechanism (10) includes a housing (100), a rotating shaft (200), a rotor (400), a first shaft sleeve (510), a second shaft sleeve (520), and a stopper member (600). The rotating shaft (200) is rotatably attached to the housing (100). The rotating shaft (200) has a connection end (210) configured to be connected to the impeller (20) and a ball head end (220) separated from the connection end (210). The rotor (400) is fixedly connected to the rotating shaft (200). A groove (512) is formed in the first shaft sleeve (510). The rotating shaft (200) is rotatably provided through the second shaft sleeve (520). The ball head end (220) is movably provided in the groove (512). The stopper member (600) is fixedly connected to at least one of the rotating shaft (200) and the rotor (400), and is capable of abutting against the second shaft sleeve (520).

Description

[Technical Field]

[0001] (CROSS-REFERENCE TO RELATED APPLICATIONS) This application claims priority to a Chinese patent application with application number CN202210800376.5 filed with the State Intellectual Property Office of China on July 8, 2022, and to a Chinese patent application with application number CN202210977269.X filed with the State Intellectual Property Office of China on August 15, 2022, the contents of which are incorporated herein by reference in their entirety.

[0002] (Technical field) This application relates to the technical field of medical devices, and in particular to drive mechanisms and blood pumps. [Background technology]

[0003] The blood pump is designed to be inserted percutaneously into a patient's blood vessels, for example, the femoral or axillary arteries or veins, and can be inserted into the patient's heart to function as a left ventricular assist device or a right ventricular assist device. Thus, the blood pump may be referred to as an intracardiac blood pump or an intravascular blood pump.

[0004] A blood pump typically has a drive mechanism and an impeller. The impeller is connected to a drive shaft of the drive mechanism. To ensure stable rotation of the drive shaft, it is usually necessary to provide a structure for positioning or limiting the position of the drive shaft, which results in a complex structure of the drive mechanism. Summary of the Invention [Problem to be solved by the invention]

[0005] Based on this, the present application provides a drive mechanism and a blood pump with a simple structure. [Means for solving the problem]

[0006] An embodiment of a first aspect of the present application provides a drive mechanism including a housing, a rotating shaft, a rotor, a first shaft sleeve, a second shaft sleeve, and a stopper member, wherein the rotating shaft is rotatably attached to the housing and has a connection end configured to be connected to the impeller and a ball head end away from the connection end, both the first shaft sleeve and the second shaft sleeve are attached to the housing, a groove is formed in the first shaft sleeve, the groove has a concave spherical wall, the rotating shaft is rotatably disposed through the second shaft sleeve, the ball head end is movably disposed in the groove and can abut against the spherical wall, the rotor is located between the first shaft sleeve and the second shaft sleeve, and the stopper member is fixedly connected to at least one of the rotating shaft and the rotor, is located between the rotor and the second shaft sleeve, and can abut against the second shaft sleeve.

[0007] A second embodiment of the present application provides a blood pump including an impeller and the drive mechanism according to the first embodiment, wherein the impeller is connected to the connection end of the rotation shaft and can rotate according to the rotation shaft.

[0008] The details of one or more embodiments of the invention are set forth in the drawings and description which follow. Other features, objects, and advantages of the invention will become apparent from the description, drawings, and claims.

[0009] In order to more clearly explain the technical solutions in the embodiments of the present application, the drawings necessary for describing the embodiments or prior art will be briefly introduced below. It is obvious that the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without any creative efforts. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a structural schematic diagram of a blood pump according to an embodiment of the present invention; [Figure 2]2 is a cross-sectional view of the blood pump shown in FIG. 1, with the cannula, impeller, and some catheters omitted. [Figure 3] FIG. 3 is a partially enlarged view of the blood pump shown in FIG. 2. [Figure 4] 2 is a cross-sectional view of the rotating shaft, stopper member, rotor, first shaft sleeve, and second shaft sleeve shown in FIG. 1 assembled together. [Figure 5] FIG. 5 is a partial enlarged view of part A shown in FIG. [Figure 6] FIG. 2 is a structural schematic diagram of the rotating shaft of the blood pump shown in FIG. [Figure 7] 2 is a schematic diagram of the assembled structure of the rotor, stator, and magnetically permeable member of the blood pump shown in FIG. 1. [Figure 8] 8 is a schematic structural diagram of the second rotor shown in FIG. 7 assembled with one magnetic permeable plate of the magnetic permeable member. FIG. [Figure 9] FIG. 8 is a structural schematic diagram of a first flywheel of a first rotor among the rotors shown in FIG. 7. [Figure 10] FIG. 3 is a partial enlarged view of part B shown in FIG. [Figure 11] 3 is a structural schematic diagram of a first shaft sleeve of the blood pump shown in FIG. 2. [Figure 12] FIG. 12 is a cross-sectional view of the second shaft sleeve shown in FIG. [Figure 13] 2 is a cross-sectional view of the blood pump shown in FIG. 1, from another angle, with the cannula, impeller, and some catheters omitted. FIG. [Figure 14] FIG. 14 is a partial enlarged view of part C shown in FIG. [Figure 15] FIG. 14 is a structural schematic diagram of the support seat of the blood pump shown in FIG. [Figure 16] FIG. 3 is a structural schematic diagram of the second shaft sleeve of the blood pump shown in FIG. 2. [Figure 17] 1 is a structural schematic diagram of a blood pump according to an embodiment of the present invention; [Figure 18] FIG. 18 is an exploded view of the blood pump shown in FIG. [Figure 19] FIG. 18 is a structural schematic diagram of the cannula assembly of the blood pump shown in FIG. 17. [Figure 20] FIG. 20 is a partial enlarged view of part D shown in FIG. [Figure 21] 20 is a structural schematic diagram of a connecting tube of the cannula assembly shown in FIG. 19. [Figure 22] FIG. 22 is a schematic diagram of the internal structure of the connecting pipe shown in FIG. 21. [Figure 23] FIG. 22 is a schematic diagram of the internal structure of the connecting pipe shown in FIG. 21. [Figure 24] FIG. 18 is an exploded view of the blood pump shown in FIG. 17, omitting the insertion tube and the connecting tube. [Figure 25] 18 is another exploded view of the blood pump shown in FIG. 17, with the insertion tube and the connecting tube omitted. [Figure 26] FIG. 18 is a cross-sectional view of the blood pump shown in FIG. 17, with the insertion tube, the connecting tube, and some of the catheters omitted. [Figure 27] FIG. 27 is a partially enlarged view of part E shown in FIG. 26. [Figure 28] FIG. 27 is a schematic diagram of the structure in which the rotating shaft, the first shaft sleeve, and the second shaft sleeve shown in FIG. 26 are assembled. [Figure 29] FIG. 29 is a schematic diagram of the assembled structure of the first shaft sleeve and a part of the rotating shaft shown in FIG. 28. [Figure 30] 29 is a diagram showing the positional relationship between the rotating shaft and the second shaft sleeve when runout occurs in the rotating shaft shown in FIG. 28. FIG. [Figure 31] FIG. 27 is a cross-sectional view of the first shaft sleeve shown in FIG. 26. [Figure 32] FIG. 27 is a structural schematic diagram of the support seat shown in FIG. 26. [Figure 33] FIG. 27 is a structural schematic diagram of the second shaft sleeve shown in FIG. 26. [Figure 34] FIG. 27 is a structural schematic diagram of the first rotor shown in FIG. 26. [Figure 35] FIG. 27 is a structural schematic diagram of the second rotor shown in FIG. 26. [Figure 36] FIG. 27 is an exploded view of the stator and magnetic permeable member shown in FIG. 26. DETAILED DESCRIPTION OF THE INVENTION

[0011] In order to more clearly understand the objectives, technical solutions 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 do not limit the present application.

[0012] It should be noted that when an element is referred to as being "fixed" or "mounted" on another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being "connected" to another element, it may be directly connected to the other element or indirectly connected to the other element.

[0013] 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 shown. 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.

[0014] Hereinafter, the technical solution of the present application will be described with reference to specific drawings and examples.

[0015] In the field of interventional medicine, the end of an instrument closest to the operator is typically defined as the proximal end, and the end away from the operator as the distal end.

[0016] The driving mechanism 10 and the blood pump 1 according to the embodiment of the present invention will be described.

[0017] Referring to FIG. 1 , blood pump 1 includes a drive mechanism 10 and an impeller 20. Drive mechanism 10 is power-transmittingly connected to impeller 20, and drive mechanism 10 can drive the rotation of impeller 20. Specifically, blood pump 1 further includes a cannula 40 fixedly connected to the distal end of drive mechanism 10. Impeller 20 is rotatably housed within cannula 40. Cannula 40 has a blood outlet 41 and a blood inlet 42. As impeller 20 rotates, blood flows into cannula 40 through blood inlet 42 and then flows out through blood outlet 41. In one embodiment, cannula 40 extends through a heart valve, e.g., an aortic valve, with blood inlet 42 located inside the heart and blood outlet 41 and drive mechanism 10 located in a blood vessel outside the heart, such as the aorta. Specifically, blood pump 1 further includes a catheter 50 connected to the proximal end of drive mechanism 10. The catheter 50 houses various supply lines, including, for example, electrical leads for electrical connection with the drive mechanism 10 and a flushing line for passing a flushing fluid through the blood pump 1. Preferably, the flushing fluid is saline, heparinized saline, glucose, or the like.

[0018] 2 to 6, the drive mechanism 10 includes a housing 100, a rotating shaft 200, a stator 300, a rotor 400, a first shaft sleeve 510, a second shaft sleeve 520, and a stopper member 600. The housing 100 is a generally cylindrical housing with both ends open. The distal end of the housing 100 is fixedly connected to the cannula 40, and the proximal end of the housing 100 is fixedly connected to the catheter 50. The housing 100 has a chamber. Specifically, a partition ring 120 is provided within the housing 100, and the partition ring 120 divides the chamber of the housing 100 into a position limiting chamber 112 and a storage chamber 114. In the illustrated embodiment, the position limiting chamber 112 and the storage chamber 114 are provided along the axial direction of the housing 100.

[0019] The rotating shaft 200 is elongated. The rotating shaft 200 is rotatably attached to the housing 100, and has a connection end 210 configured to be connected to the impeller 20 and a ball head end 220 remote from the connection end 210. In the illustrated example, the rotating shaft 200 extends generally along the axial direction of the housing 100, or the extension direction of the axis of the rotating shaft 200 generally coincides with the axial direction of the housing 100. The position limiting chamber 112 and the accommodating chamber 114 are provided along the axis of the rotating shaft 200. The rotating shaft 200 is provided to penetrate the position limiting chamber 112, a portion of the rotating shaft 200 is accommodated in the accommodating chamber 114, a portion of the rotating shaft 200 is located outside the housing 100, or a portion of the rotating shaft 200 extends within the cannula 10. The portion of the rotating shaft 200 that extends outside the housing 100 or into the cannula 10 is the connecting end 210 of the rotating shaft 200, and the ball head end 220 is located within the receiving chamber 114. Specifically, the impeller 20 is fixedly connected to the connecting end 210 so that the impeller 20 can rotate along the rotating shaft 200. In some embodiments, the rotating shaft 200 is made of a ceramic material. Compared to metal materials, ceramics have high processing precision, high biocompatibility, high mechanical strength, and good wear resistance and corrosion resistance.

[0020] The stator 300 is fixedly attached to the housing 100, i.e., the stator 300 is provided in a chamber of the housing 100. In the illustrated embodiment, the stator 300 is located in the accommodating chamber 114. The rotating shaft 200 is rotatably disposed through the stator 300. The rotor 400 is located in the housing 100, i.e., the rotor 400 is also provided in a chamber of the housing 100. In the illustrated embodiment, the rotor 400 is located in the accommodating chamber 114. The rotor 400 is fixedly connected to the rotating shaft 200, and the stator 300 can drive the rotation of the rotor 400, which in turn can drive the rotation of the rotating shaft 200. Specifically, the rotor 400 is magnetic, and the stator 300 can generate a rotating magnetic field that drives the rotation of the rotor 400.

[0021] 7 , in the illustrated embodiment, the rotor 400 includes a first rotor 410 and a second rotor 420, both of which are fixedly connected to the rotating shaft 200. The first rotor 410 and the second rotor 420 are rotatably accommodated in the accommodation chamber 114 of the housing 100. The first rotor 420 and the second rotor 420 are disposed along the axis of the rotating shaft 200. The stator 300 is located between the first rotor 410 and the second rotor 420. The first rotor 410 and the second rotor 420 are both magnetic, and the stator 300 can generate a rotating magnetic field that drives the rotation of the first rotor 410 and the second rotor 420. Specifically, the first rotor 410 includes a first magnet 411, which is fixedly connected to the rotating shaft 200. The first magnet 411 is an annular Halbach array magnet. Specifically, the first rotor 410 further includes a first flywheel 412, which is fixedly connected to the rotating shaft 200, and the first magnet 411 is fixedly connected to the first flywheel 412. By providing the first flywheel 412, it is possible to increase the connection strength between the first magnet 411 and the rotating shaft 200 and also reduce shaking of the rotating shaft 200 during rotation, thus making the entire rotating shaft 200 more stable during rotation.

[0022] 9, specifically, the first flywheel 412 includes a first internal pipe 4121, a first disk portion 4122, and a first outer annular wall 4123. Both the first internal pipe 4121 and the first outer annular wall 4123 have a circular tubular structure, and the first disk portion 4122 has an annular disk structure. Both the first internal pipe 4121 and the first outer annular wall 4123 are fixedly connected to the first disk portion 4122. The first outer annular wall 4123 is arranged to surround the first disk portion 4122, and both the first internal pipe 4121 and the first outer annular wall 4123 are arranged coaxially. The rotating shaft 200 is arranged to penetrate through the first internal pipe 4121 and is fixedly connected to the first internal pipe 4121. A first annular chamber 4124 is formed between the first internal pipe 4121 and the first outer annular wall 4123. The first magnet 411 is accommodated in the first annular chamber 4124. The shape of the first annular chamber 4124 is adapted to the first magnet 411 so as to facilitate the installation and positioning of the first magnet 411. In this way, the first flywheel 412 can act as a position limiter for the first magnet 411, which not only facilitates the installation of the first magnet 411 but also makes the coupling between the first magnet 411 and the first flywheel 412 more stable.

[0023] Note that the first flywheel 412 is not limited to the above structure. In some embodiments, the first flywheel 412 does not have the first outer annular wall 4123. In some embodiments, the first flywheel 412 does not have the first outer annular wall 4123 or the first internal tube 4121. In this case, the rotating shaft 200 is fixedly installed through the center of the first disk portion 4122. By providing the first internal tube 4121 to the first flywheel 412 having only the first disk portion 4122, the first flywheel 412 and the rotating shaft 200 can be more stably connected. The second rotor 420 includes a second magnet 421, which is fixedly connected to the rotating shaft 200. Specifically, the second magnet 421 is an annular Halbach array magnet. Specifically, second rotor 420 further includes second flywheel 422, which is fixedly connected to rotating shaft 200, and second magnet 421 is fixed to second flywheel 422. By providing second flywheel 422, the connection strength between second magnet 421 and rotating shaft 200 can be increased, and shaking of rotating shaft 200 during rotation can also be reduced, making the entire rotating shaft 200 more stable during rotation.

[0024] 4, the second flywheel 422 includes a second internal pipe 4221, a second disk portion 4222, and a second outer annular wall 4223. Both the second internal pipe 4221 and the second outer annular wall 4223 have a circular tubular structure, and the second disk portion 4222 has an annular disk structure. Both the second internal pipe 4221 and the second outer annular wall 4223 are fixedly connected to the second disk portion 4222. The second outer annular wall 4223 is arranged to surround the second disk portion 4222. The second internal pipe 4221 and the second outer annular wall 4223 are coaxial. The rotating shaft 200 penetrates the second internal pipe 4221 and is fixedly connected to the second internal pipe 4221. A second annular chamber is formed between the second internal pipe 4221 and the second outer annular wall 4223. The second magnet 421 is accommodated in the second annular chamber. The shape of the second annular chamber is adapted to the second magnet 421 to facilitate the installation and positioning of the second magnet 421. In this way, the second flywheel 422 can act as a position limiter for the second magnet 421, which not only facilitates the installation of the second magnet 421 but also makes the connection between the second magnet 421 and the second flywheel 422 more stable.

[0025] The second flywheel 422 is not limited to the above structure, and in some embodiments, the second flywheel 422 does not have the second outer annular wall 4223, and in some embodiments, the second flywheel 422 does not have the second outer annular wall 4223 or the second built-in pipe 4221, and in this case, the rotating shaft 200 is fixedly provided to penetrate through the center of the second disc portion 4222. By providing the second built-in pipe 4221 to the second flywheel 422 that has only the second disc portion 4222, the second flywheel 422 and the rotating shaft 200 can be connected more stably.

[0026] Specifically, the stator 300 includes a first stator unit 310 and a second stator unit 320 arranged along the axis of the rotating shaft 200. The first stator unit 310 can drive the rotation of the first rotor 410, and the second stator unit 320 can drive the rotation of the second rotor 420. Specifically, the first stator unit 310 can generate a rotating magnetic field that drives the rotation of the first rotor 410, and the second stator unit 320 can generate a rotating magnetic field that drives the rotation of the second rotor 420. Both the first stator unit 310 and the second stator unit 320 are fixedly accommodated in the accommodating chamber 114 of the housing 100. The rotating shaft 200 is rotatably disposed through the first stator unit 310 and the second stator unit 320. Both the first stator unit 310 and the second stator unit 320 are located between the first rotor 410 and the second rotor 420.

[0027] Both the first stator unit 310 and the second stator unit 320 include a magnetic core and a coil, and the coil is wound around the magnetic core. Specifically, the first stator unit 310 includes a first magnetic core 312 and a first coil 313, and the first coil 313 is wound around the first magnetic core 312. There are multiple first magnetic cores 312, and the multiple first magnetic cores 312 are arranged around the axis of the rotating shaft 200. Each first magnetic core 312 is provided with one first coil 313. The structure of the second stator unit 320 is similar to that of the first stator unit 310. Referring to FIG. 8 , the second stator unit 320 includes a second magnetic core 322 and a second coil 323, and the second coil 323 is wound around the second magnetic core 322. There are a plurality of second magnetic cores 322, and the plurality of second magnetic cores 322 are provided around the axis of the rotating shaft 200. Each second magnetic core 322 is provided with one second coil 323.

[0028] Specifically, the drive mechanism 10 further includes a magnetically permeable member 700 fixedly connected to the housing 100, and the first magnetic core 312 of the first stator unit 310 and the second magnetic core 322 of the second stator unit 320 are both fixedly connected to the magnetically permeable member 700. Specifically, the magnetically permeable member 700 is fixedly accommodated within the housing 100, and is, for example, engaged with an inner wall of the housing 100. The rotating shaft 200 is rotatably disposed through the magnetically permeable member 700. One end of the first magnetic core 312 is fixedly connected to the magnetically permeable member 700, the first rotor 410 is disposed adjacent to the other end of the first magnetic core 312, one end of the second magnetic core 423 is fixedly connected to the magnetically permeable member 700, and the second rotor 420 is disposed adjacent to the other end of the second magnetic core 322.

[0029] The magnetic permeable member 700 closes the magnetic path, promoting and increasing the generation of magnetic flux and improving coupling capability. Therefore, providing the magnetic permeable member 700 closes the magnetic path between the first stator unit 310 and the first rotor 410 and between the second stator unit 320 and the second rotor 420, thereby increasing the magnetic flux. Therefore, providing the magnetic permeable member 700 is advantageous for reducing the overall diameter of the drive mechanism 10. Furthermore, by fixedly connecting both the first magnetic core 312 of the first stator unit 310 and the second magnetic core 322 of the second stator unit 320 to the magnetic permeable member 700, the positioning and attachment of the first stator unit 310 and the second stator unit 320 can be achieved, and the difficulty of assembling the first stator unit 310 and the second stator unit 320 can be reduced. At the same time, the magnetically permeable member 700 provided as above can also reduce the installation of positioning structures within the housing 100, simplifying the structure of the housing 100 and the assembly process of the entire drive mechanism 10.

[0030] Specifically, the magnetic permeable member 700 includes two magnetic permeable plates 710, which are stacked one on top of the other, one of which is fixedly connected to the first magnetic core 312 of the first stator unit 310, and the other of which is fixedly connected to the second magnetic core 322 of the second stator unit 320, and the rotating shaft 200 is rotatably disposed to pass through the two magnetic permeable plates 710. Specifically, the two magnetic permeable plates 710 are separate before assembly, and the magnetic permeable member 700 is provided as two separate magnetic permeable plates 710 before assembly. Therefore, when assembling the drive mechanism 10, the first magnetic core 312 can be first fixedly connected to the magnetic permeable plate 710, the second magnetic core 322 can be fixedly connected to another magnetic permeable plate 710, and then the two magnetic permeable plates 710 can be stacked. In this way, it is convenient to assemble the first magnetic core 312 and the second magnetic core 322 into two magnetic permeable plates 710 respectively, and the assembly of the first magnetic core 321 and the second magnetic core 322 becomes more convenient.

[0031] Specifically, by fixedly connecting the two magnetic permeable plates 710, the first stator unit 310, the second stator unit 320, and the magnetic permeable member 700 are integrated and assembled within the housing 100, making it easier to assemble the stator 300. For example, the two magnetic permeable plates 710 may be connected by adhesive or welding. In other embodiments, the two magnetic permeable plates 710 are not fixedly connected but are in contact with each other. The magnetic permeable member 700 is not limited to being formed by combining the two separate magnetic permeable plates 710. The magnetic permeable member 700 may have a plate-like structure, and the first magnetic core 231 and the second magnetic core 241 are both connected to the magnetic permeable member 700. That is, the first stator unit 310 and the second stator unit 320 share one magnetic permeable member 700.

[0032] Specifically, the magnetic permeable plate 710 is made of silicon steel, and the first magnetic core 312 and the second magnetic core 322 are also made of silicon steel.

[0033] 2, 4, and 5 again, the first shaft sleeve 510 and the second shaft sleeve 520 are both attached to the housing 100. Specifically, the first shaft sleeve 510 is accommodated in the accommodation chamber 114, and the second shaft sleeve 520 is accommodated in the position limiting chamber 112. Both the first shaft sleeve 510 and the second shaft sleeve 520 are fixedly connected to the housing 100. The first shaft sleeve 510 and the second shaft sleeve 520 are spaced apart along the axial direction of the housing 100, and the first shaft sleeve 510 and the second shaft sleeve 520 can limit the position of the rotating shaft 200. The second shaft sleeve 520 is closer to the connecting end 210 of the rotating shaft 200 than the first shaft sleeve 510, or the second shaft sleeve 520 is closer to the partition ring 120 in the housing 100 than the first shaft sleeve 510. The rotor 400 is located between the first shaft sleeve 510 and the second shaft sleeve 520, and the stator 300 is also located between the first shaft sleeve 510 and the second shaft sleeve 520. In the illustrated embodiment, the first rotor 410, the second rotor 420, the first stator unit 310, and the second stator unit 320 are all located between the first shaft sleeve 510 and the second shaft sleeve 520, with the first rotor 410 located close to the first shaft sleeve 510 and the second rotor 420 located close to the second shaft sleeve 520. In other words, the first shaft sleeve 510, the first rotor 410, the first stator unit 310, the second stator unit 320, the second rotor 420, and the second shaft sleeve 520 are located in order along the axis of the rotating shaft 200, and the second shaft sleeve 510 is closest to the connection end 210 of the rotating shaft 200.

[0034] The first shaft sleeve 510 is formed with a groove 512, which has a recessed spherical wall 514. The rotating shaft 200 is rotatably disposed through the second shaft sleeve 520, and the ball head end 220 of the rotating shaft 200 is movably disposed within the groove 512, and the ball head end 220 of the rotating shaft 200 can abut against the spherical wall 514. The groove 512 can support and limit the position of the ball head end 220 of the rotating shaft 200, thereby limiting the range of movement of the rotating shaft 200 along the axis of the rotating shaft 200 in a direction away from the impeller 20 and the range of oscillation of the ball head end 220 of the rotating shaft 200 in the radial direction of the rotating shaft 200.

[0035] 10, 11 and 12, specifically, the groove 512 has a groove opening 512a, the rotating shaft 200 is provided to penetrate the groove opening 512a, and the groove opening 512a of the groove 512 is provided with a rounded chamfer 515. That is, by rounding the groove wall at the groove opening 512a of the groove 512, it is possible to prevent the rotating shaft 200 from being scratched and worn by the groove opening 512a of the groove 512, which has corners.

[0036] Specifically, the length h of the ball head end 220 in the axial direction of the rotating shaft 200 is smaller than the depth s of the groove 512 (the depth s of the groove 512 is the maximum distance from the groove opening 512a of the groove 512 to the spherical wall 514). This better restricts the ball head end 220 within the groove 512 and reduces the range of oscillation of the rotating shaft 200 in the radial direction. However, to avoid the rotating shaft 200 being positioned in the groove 512 for too long, the depth of the groove 512 should not be too large, otherwise the length of the rotating shaft 200 may become too long. In the illustrated embodiment, the radius of the spherical wall 514 is larger than the radius of the ball head end 220. That is, the radius of the sphere on which the spherical wall 514 is positioned is larger than the radius of the sphere on which the ball head end 220 is positioned. The length L of the spherical wall 514 in the axial direction of the first shaft sleeve 510 is smaller than the depth s of the groove 512.

[0037] Specifically, the first shaft sleeve 510 is further formed with a fluid passage hole 516 that communicates with the groove 512. The fluid passage hole 512 can communicate with a flushing line in the catheter 50, allowing flushing fluid to flow into the groove 512 through the fluid passage hole 516. When the flushing fluid flows between the groove wall of the groove 512 and the ball head end 220, it can act as a lubricant, reducing friction between the ball head end 220 and the groove wall of the groove 512 and reducing wear on the ball head end 220 and the groove wall.

[0038] Specifically, opening 516a of liquid passage hole 516 is located at the center position of spherical wall 514, so that the cleaning liquid that flows from liquid passage hole 516 into recessed groove 512 provides as much axial impact force as possible to ball head end 220 of rotating shaft 200. More specifically, the central axis of liquid passage hole 516 overlaps with the central axis of the chamber surrounded by spherical wall 514, making liquid passage hole 516 a straight hole and reducing the energy consumption of the cleaning liquid in liquid passage hole 516.

[0039] Specifically, the diameter of opening 516a of fluid passage hole 516 located in spherical wall 514 is 1 / 9 to 1 / 3 of the diameter of the sphere on which ball head end 220 is located (the diameter of ball head end 220 is the diameter of the sphere on which ball head end 220 is located). In the illustrated embodiment, the diameter of fluid passage hole 516 is constant, that is, the diameter of fluid passage hole 516 is 1 / 9 to 1 / 3 of the diameter of ball head end 220. If the diameter of opening 516a of fluid passage hole 516 located in spherical wall 514 is too large, the contact area between ball head end 220 and spherical wall 514 will be small, increasing wear of ball head end 220 by spherical wall 514. If the diameter of opening 516a is too small, it will affect the amount of cleaning liquid that flows into groove 512 from liquid passage hole 516. The cleaning liquid that flows into groove 512 will apply an impact force to ball head end 220, and will also flow between ball head end 220 and spherical wall 514 to act as a lubricant and reduce the coefficient of friction between ball head end 220 and spherical wall 514, so it is undesirable for the amount of cleaning liquid that flows into groove 512 to be too small.

[0040] 13, 14, and 15, specifically, the drive mechanism 10 further includes a support seat 800 fixedly connected to the housing 100. The support seat 800 is formed with a mounting chamber 810 and a liquid inlet hole 820 communicating with the mounting chamber 810, and the first shaft sleeve 510 is mounted to the mounting chamber 810. The liquid passage hole 516 communicates with the liquid inlet hole 820. One end of the liquid inlet hole 820 remote from the mounting chamber 810 communicates with the flushing line of the catheter 50 so that the flushing liquid flows through the liquid inlet hole 820 and the liquid passage hole 516 into the gap between the groove wall of the groove 512 and the ball head end 220, and then into the chamber of the housing 100.

[0041] Specifically, the mounting chamber 810 has a chamber bottom 812, the opening of the liquid inlet hole 820 is located at the chamber bottom 812 of the mounting chamber 810, and a support step 814 is provided within the mounting chamber 810, and the support step 814 abuts against the first shaft sleeve 510 to separate the first shaft sleeve 510 and the chamber bottom 812 by a certain distance, thereby ensuring smooth flow of the cleaning liquid. Specifically, the support step 814 abuts against the surface of the first shaft sleeve 510 that faces away from the second shaft sleeve 520.

[0042] Specifically, the support seat 800 is further formed with a branch channel 830, which is fluidly connected to the liquid inlet hole 820. The cleaning liquid flowing through the liquid inlet hole 820 can then flow into the chamber of the housing 100 via the branch channel 830. Specifically, one end of the branch channel 830 is connected to the gap between the first shaft sleeve 510 and the chamber bottom 812 of the mounting chamber 810, and the other end is connected to the receiving chamber 114. In the illustrated embodiment, the branch channel 830 is formed by recessing a portion of the chamber wall of the mounting chamber 810. In other words, under normal conditions, the cleaning liquid flows from the liquid inlet hole 820 into the mounting chamber 810 and then branches into two channels. One channel flows into the groove 512 of the first shaft sleeve 510 via the liquid passage hole 516, and the other channel flows out via the branch channel 830. By providing the branch flow channels 830, it is possible to ensure the flow of cleaning fluid even when the ball head end 220 blocks the fluid passage hole 516. In the illustrated embodiment, the number of branch flow channels 830 is two, and the two branch flow channels 830 are provided opposite each other. Note that the number of branch flow channels 830 can be adjusted according to design needs; for example, in some embodiments, the number of branch flow channels 830 may be one or more than two.

[0043] 2, 3, 4, and 16, the second shaft sleeve 520 abuts against the partition ring 120; that is, the partition ring 120 is located between the second shaft sleeve 520 and the rotor 400. In the illustrated embodiment, the partition ring 120 is located between the second shaft sleeve 520 and the second rotor 420. The partition ring 120 facilitates positioning of the second shaft sleeve 520, facilitating assembly of the second shaft sleeve 520. A shaft hole 522 is formed in the second shaft sleeve 520, and the rotating shaft 200 is rotatably disposed through the shaft hole 522. In the illustrated embodiment, the central axis of the shaft hole 522 overlaps with the central axis of the fluid passage hole 516 of the first shaft sleeve 510. A gap through which fluid can flow is provided between the hole wall of the shaft hole 522 of the second shaft sleeve 520 and the rotating shaft 200. The cleaning liquid that has flowed into the containing chamber 114 can flow through the gap between the rotating shaft 200 and the wall of the shaft hole 522 and then flow out of the housing 100 .

[0044] The stopper member 600 is fixedly connected to at least one of the rotating shaft 200 and the rotor 400 (specifically, the second rotor 420). In other words, the stopper member 600 may be directly fixed only to the rotor 400, only to the rotating shaft 200, or simultaneously to both the rotor 400 and the rotating shaft 200. Because the rotor 400 is fixedly connected to the rotating shaft 200, the stopper member 600, the rotating shaft 200, and the rotor 400 rotate and move synchronously. The stopper member 600 is located between the rotor 400 and the second shaft sleeve 520, and abuts against the second shaft sleeve 520 to restrict movement of the rotating shaft 200 along the axis of the rotating shaft 200 in a direction approaching the impeller 20.

[0045] Since the stopper member 600, the rotating shaft 200, and the rotor 400 rotate and move synchronously, the stopper member 600 abuts against the second shaft sleeve 520, thereby restricting the movement of the rotating shaft 200 along the axis of the rotating shaft 200 in a direction toward the impeller 20, and the ball head end 220 of the rotating shaft 200 is provided in the groove 512 of the first shaft sleeve 510 and abuts against the spherical wall 514 of the groove 512, thereby restricting the range of movement of the rotating shaft 200 along the axis of the rotating shaft 200 in a direction away from the impeller 20, thereby realizing positional restriction on the axis of the rotating shaft 200. Furthermore, because the rotating shaft 200 penetrates the second shaft sleeve 520 and the ball head end 220 of the rotating shaft 200 is disposed in the groove 512 of the first shaft sleeve 510, the groove wall of the groove 512 of the first shaft sleeve 510 can also limit the swing range of the ball head end 220 of the rotating shaft 200 in the radial direction of the rotating shaft 200, thereby realizing an overall limit on the swing range of the rotating shaft 200 in the radial direction. In other words, the above design not only realizes axial positional restriction for the rotating shaft 200, but also radial positional restriction for the rotating shaft 200.

[0046] In the illustrated embodiment, the stopper member 600 is fixedly connected to the second rotor 420. Specifically, the stopper member 600 is fixedly connected to the second flywheel 422 of the second rotor 420. In some embodiments, the stopper member 600 is glued to the second flywheel 422 of the second rotor 420, and in some embodiments, the stopper member 600 is integrally molded with the second flywheel 422 of the second rotor 420. Because the overall volume of the blood pump 1 is small, the volume of the stopper member 600 is smaller, which makes machining precision difficult and assembly difficult. Therefore, integrally molding the stopper member 600 and the second flywheel 422 facilitates installation and eliminates the need for an adhesive operation.

[0047] Specifically, when the stopper member 600 abuts against the second shaft sleeve 520, at least a portion of the stopper member 600 is located on the inner ring of the partition ring 120, a gap for fluid flow exists between the stopper member 600 and the inner ring wall of the partition ring 120, and there is a certain distance between the partition ring 120 and the rotor 400. The gap for fluid flow exists between the stopper member 600 and the inner ring wall of the partition ring 120, so that the cleaning liquid can flow into the gap between the hole walls of the axial bore 522 of the second shaft sleeve 520 through the gap between the stopper member 600 and the inner ring wall of the partition ring 120, thereby realizing fluid communication between the axial bore 522 of the second shaft sleeve 520 and the receiving chamber 114. Furthermore, when the stopper member 600 abuts against the second shaft sleeve 520, the partition ring 120 and the rotor 400 are spaced apart by a certain distance, thereby preventing wear due to contact friction between the rotor 400 and the partition ring 120 when the stopper member 600 abuts against the second shaft sleeve 520. Specifically, the stopper member 600 is substantially annular, and the central axis of the stopper member 600 overlaps with the axis of the rotating shaft 200. The outer diameter of the stopper member 600 is smaller than the inner diameter of the partition ring 120, thereby providing a gap through which fluid can flow between the stopper member 600 and the inner ring wall of the partition ring 120. In another embodiment, the stopper member 600 may be formed by an array of multiple sector rings, and the multiple sector rings may be arranged around the rotating shaft 200 at equal intervals, or may be arranged by an array of multiple sector rings arranged discretely in the circumferential direction.

[0048] Specifically, the thickness of the stopper member 600 along the axis of the rotating shaft 200 is greater than the thickness of the partition ring 120 along the axis of the rotating shaft 200, so that when the stopper member 600 abuts against the second shaft sleeve 520, there is a certain distance between the partition ring 120 and the rotor 400. Note that in some embodiments, the thickness of the stopper member 600 along the axis of the rotating shaft 200 may be equal to or less than the thickness of the partition ring 120 along the axis of the rotating shaft 200, in which case the rotor 400 (specifically, the second rotor 420) and the stopper member 600 may be spaced apart by a certain distance in the direction along the axis of the rotating shaft 200, and this distance can separate the partition ring 120 and the rotor 400 by a certain distance when the stopper member 600 abuts against the second shaft sleeve 520.

[0049] Specifically, a portion of the surface of the second shaft sleeve 520 facing the stopper member 600 is recessed to form a flow guide groove 524, which communicates with the axial hole 522 of the second shaft sleeve 520. When the stopper member 600 abuts against the second shaft sleeve 520, a portion of the flow guide groove 524 is not covered by the stopper member 600. Therefore, even if there is a problem of the stopper member 600 blocking the gap between the axial hole 522 of the second shaft sleeve 520 and the rotating shaft 200 when the stopper member 600 abuts against the second shaft sleeve 520, causing an obstruction to the flow of cleaning liquid, the flow guide groove 524 that is not covered by the stopper member 600 realizes fluid communication when the stopper member 600 abuts against the second shaft sleeve 520, thereby ensuring smooth flow of cleaning liquid. In addition, a portion of the surface of the second shaft sleeve 520 facing the stopper member 600 is recessed to form a guide groove 524, which allows the cleaning liquid to flow more easily between the stopper member 600 and the second shaft sleeve 520, thereby lubricating the contact surfaces between the stopper member 600 and the second shaft sleeve 520, reducing friction between the stopper member 600 and the second shaft sleeve 520, and reducing wear problems caused by friction between the stopper member 600 and the second shaft sleeve 520.

[0050] The stopper member 600 has a stopper surface 610 that is perpendicular to the axis of the rotating shaft 200, and the second shaft sleeve 520 has an engagement surface 526 that is perpendicular to the central axis of the shaft hole 522 of the second shaft sleeve 520, the engagement surface 526 facing the stopper surface 610, and the engagement surface 526 abuts against the stopper surface 610 to restrict movement of the rotating shaft 200 along the axis of the rotating shaft 200 in a direction approaching the impeller 20. The stopper surface 610 is perpendicular to the axis of the rotating shaft 200, the locking surface 526 is perpendicular to the central axis of the shaft hole 522 of the second shaft sleeve 520, and the rotating shaft 200 is rotatably inserted through the shaft hole 522 of the second shaft sleeve 520. Therefore, when the rotating shaft 200 operates normally and the stopper member 600 abuts against the second shaft sleeve 520, the stopper surface 610 and the locking surface 526 can come into surface contact, thereby reducing wear due to friction between the stopper member 600 and the second shaft sleeve 520. Specifically, the locking surface 526 abuts against the partition ring 120. The flow guide groove 524 is formed by recessing a portion of the locking surface 526.

[0051] Specifically, the roughness of at least one of the stopper surface 610 and the locking surface 526 is 0.1 micrometers or less. In some embodiments, the roughness of both the stopper surface 610 and the locking surface 526 is 0.1 micrometers or less. In some embodiments, the roughness of one of the stopper surface 610 and the locking surface 526 is 0.1 micrometers or less. Reducing the roughness of at least one of the stopper surface 610 and the locking surface 526 can effectively reduce the frictional force between the stopper surface 610 and the locking surface 526, thereby reducing wear problems due to friction between the second shaft sleeve 520 and the stopper member 600.

[0052] In some embodiments, at least one of the stopper surface 610 and the locking surface 526 is a ceramic surface. Ceramics have high processing precision, high biocompatibility, high mechanical strength, and good wear resistance and corrosion resistance. In this case, the material of the stopper member 600 and the second shaft sleeve 520 may be ceramic, or at least one of the stopper surface 610 and the locking surface 526 may be provided with a ceramic coating. In some embodiments, the material of the stopper surface 610 is diamond, which provides the stopper surface 610 with high hardness, a smooth surface, and resistance to wear. In this case, the material of the stopper surface 610 is provided with a diamond coating.

[0053] Note that the structure of the drive mechanism 10 is not limited to the above structure. In some embodiments, the number of rotors 400 and the number of stators 300 are both one, and in this case, the rotor 400 is provided adjacent to the second shaft sleeve 520, and the stator unit is provided adjacent to the first shaft sleeve 510. In some embodiments, the rotor 400 still has a first rotor 410 and a second rotor 420, but the stator 300 has one stator unit, and in this case, the stator unit is located between the first rotor 410 and the second rotor 420, and the stator unit can drive and rotate the first rotor and the second rotor simultaneously.

[0054] 17 and 18 , the blood pump 1 includes a drive mechanism 10 and an impeller 20. The drive mechanism 10 is transmission-connected to the impeller 20 and is capable of driving the rotation of the impeller 20. Specifically, the blood pump 1 further includes a cannula assembly 30 fixedly connected to a distal end of the drive mechanism 10. The impeller 20 is rotatably housed in the cannula assembly 30. The cannula assembly 30 has a blood inlet 31 and a blood outlet 32. The blood inlet 31 is located at the distal end of the cannula assembly 30, and the blood outlet 32 ​​is located at the proximal end of the cannula assembly 30. The blood outlets 32 are plural in number and are distributed at intervals around the circumference of the cannula assembly 30. As the impeller 20 rotates, blood flows into the cannula assembly 30 through the blood inlet 31 and then flows out through the blood outlet 32. In one embodiment, the cannula assembly 30 is inserted to extend through a heart valve, for example the aortic valve, with the blood inlet 31 located within the heart and the blood outlet 32 ​​and drive mechanism 10 located outside the heart in a blood vessel such as the aorta.

[0055] 19, the cannula assembly 30 includes an insertion tube 33, a connecting tube 34, and an outlet tube 35, all of which are hollow tubular structures. The insertion tube 33 is fitted into the connecting tube 34, so that the inner wall of one end of the connecting tube 34 is connected to the outer wall of the insertion tube 33. Specifically, the insertion tube 33 has a proximal end and a distal end, and the proximal end of the insertion tube 33 is connected to the connecting tube 34, and the blood inlet 31 is located at the distal end of the insertion tube 33.

[0056] 20 , the outlet tube 35 includes a connection portion 351 adjacent to the connecting tube 34 and an outlet portion 352 remote from the connecting tube 34. The outlet tube 35 is fitted onto the connecting tube 34, so that the outer wall of the connection portion 351 is connected to the inner wall of the end of the connecting tube 34 remote from the insertion tube 33. The end of the outlet portion 352 remote from the connecting tube 34 is fixedly connected to the drive mechanism 10, and the impeller 20 is rotatably disposed within the outlet tube 35, or the impeller 20 is partially disposed within the outlet tube 35 and partially disposed within the insertion tube 33. The blood outlet 32 ​​is located at the outlet portion 352. The plurality of blood outlet ports 32 are uniformly provided in the outlet section 352 in the circumferential direction of the outlet tube 35, and the impeller 20 is driven to rotate by the drive mechanism 10, whereby blood flows in through the blood inlet port 31, passes through the insertion tube 33, and flows out through the plurality of blood outlet ports 32 of the outlet tube 35.

[0057] In the conventional connection method between the insertion pipe 33 and the outlet pipe 35, the insertion pipe 33 is directly inserted into the outlet pipe 35. However, since the insertion pipe 33 is a flexible tube and the outlet pipe 35 is a metal pipe, there is no matching assembly position and the diameters of the two pipes are different. Therefore, in order to insert the insertion pipe 33 into the outer wall of the outlet pipe 35, the insertion pipe 33 before connection must be processed to enlarge the port diameter of the insertion pipe 33 to match the outlet pipe 35. This process is complicated, the connection is unstable, and the strength of the molded part is reduced.

[0058] In the cannula assembly 30 of this embodiment, the insertion tube 33 and the outlet tube 35 are transitionally connected via the connecting tube 34, the inner wall of one end of the connecting tube 34 is connected to the outer wall of the insertion tube 33, and the outer wall of the connecting portion 351 of the outlet tube 35 is connected to the inner wall of the other end of the connecting tube 34, thereby firmly connecting the insertion tube 33 and the outlet tube 35 to form a continuous tube line. This eliminates the need to perform a molding process on the insertion tube 33 in order to directly fit the insertion tube 33 and the outlet tube 35, resulting in a strong connection and a simple assembly operation.

[0059] 19 to 22, a position limiting convex ring 341 is provided on the inner wall of the connecting pipe 34. Specifically, the position limiting convex ring 341 is provided in a circular shape and protrudes from the inner wall of the connecting pipe 34, and the position limiting convex ring 341 is coaxial with the connecting pipe 34. The position limiting convex ring 341 has a first end face 3411 and a second end face 3412 provided along the axial direction of the connecting pipe 34, the first end face 3411 abutting against the end of the insertion pipe 33, and the second end face 3412 abutting against the end of the connection portion 351. The outer diameter of the connection portion 351 is smaller than the outer diameter of the outlet portion 352. One end of the connecting pipe 34 away from the insertion pipe 33 abuts against one end of the outlet portion 352 close to the connection portion 351, and the outer wall of the connecting pipe 34 is flush with the outer wall of the outlet portion 352. Specifically, the connection portion 351 and the outlet portion 352 have the same inner diameter, and the position limiting convex ring 341 has a constant thickness, thereby forming a first end surface 3411 adjacent to the insertion tube 33 and a second end surface 3412 adjacent to the outlet tube 35. When the insertion tube 33 and the outlet tube 35 are inserted into the connecting tube 34, the position limiting convex ring 341 can simultaneously limit the axial positions of the outlet tube 35 and the insertion tube 33, thereby controlling the insertion tube 33's insertion depth and pre-positioning, facilitating the subsequent fixed connection operation. At the same time, the end of the connecting tube 34 can abut against the end of the outlet portion 352, which, together with the position limiting convex ring 341, forms position limits in two axial directions, resulting in a more stable fit. At this time, the outer wall of the connecting pipe 34 and the outer wall of the outlet section 352 are flush with each other, and the outer wall of the connecting pipe 34 and the outer wall of the outlet section 352 of the outlet pipe 35 are located on the same cylindrical surface, which effectively controls the overall outer diameter of the connection point between the connecting pipe 34 and the outlet pipe 35, making the transition at the connection point smooth, and avoiding the presence of wavy steps that make it difficult to enter the human blood vessels, thereby preventing damage to the blood vessels.

[0060] 18 to 20 and 24, impeller 20 includes blades 21. One end of blade 21 that is remote from drive mechanism 10 does not extend beyond the other end of connection portion 351 that is remote from drive mechanism 10. Specifically, impeller 20 further includes hub 22, and blade 21 is spirally wound around hub 22. A portion of impeller 20 is disposed in outlet pipe 35, and drive mechanism 10 drives impeller 20 to rotate. Because the impeller 20 vibrates and yawing when it rotates, a certain distance must be maintained between it and the inner wall of the outlet pipe 35 to ensure that the blades 21 do not collide with the inner wall of the outlet pipe 35 even when the impeller 20 yawing at its maximum. The inner wall of the pipe where the position limiting ring 341 is located is narrow, and the blades 21 have a certain height in the axial direction of the outlet pipe 35, occupy a certain width in the radial direction of the outlet pipe 35, and their highest axial points do not extend beyond the outlet pipe 35, preventing the blades 21 from contacting the position limiting ring 341. Furthermore, the position limiting ring 341 is not limited to the complete circular ring structure described above, but may have a structure with multiple unconnected, evenly spaced bosses, which can save material while ensuring position limiting. The position limiting ring 341 may be independently connected to the connecting pipe 34 or integrally molded with the connecting pipe 34, which provides greater strength.

[0061] 20 , the inner diameter of the insertion tube 33 is smaller than that of the outlet tube 35, and the radial width of the first end face 3411 is larger than that of the second end face 3412, so that the inner wall of the insertion tube 33 is flush with the edge of the first end face 3411, and the inner wall of the outlet tube 35 is flush with the edge of the second end face 3412. The position limiting convex ring 341 further includes a transition surface 3413, which connects the edge of the first end face 3411 and the edge of the end face of the second end face 3412. Specifically, the insertion tube 33 and the outlet tube 35 have different dimensions and specifications. Because the two have different inner diameters, i.e., the first end face 3411 protrudes radially further from the inner wall of the connecting tube 34 than the second end face 3412, when they abut against the position limiting convex ring 341, the edge of the first end face 3411 must be flush with the inner wall of the insertion tube 33, and the edge of the second end face 3412 must be flush with the inner wall of the outlet tube 35. In this way, after the outlet tube 35 and the insertion tube 33 abut against the position limiting convex ring 341, the blood flow passage formed by the inner walls of the three becomes more continuous, and no dead space is formed at the connection transition point between the three, preventing blood from flowing into the dead space and causing blood clogging and forming thrombi.

[0062] More specifically, because the widths of the first end face 3411 and the second end face 3412 are different, the distance between the first end face 3411 and the second end face 3412 forms a large vertical step, and the direction of blood flow is from the insertion tube 33 to the outlet tube 35, and a dead space is also formed between the two. As a result, the transition surface 3413 connects the edge of the first end face 3411 and the edge of the second end face 3412 to form a gradual transition surface 3413, allowing blood to flow directly along the transition surface 3413, and there is no risk of blood clogging and forming a thrombus due to the formation of a dead space.

[0063] The transition surface 3413 may be a convex or concave curved surface, with the curved surface having a better flow-guiding effect on the blood.

[0064] 20 , the transition surface 3413 has a cylindrical surface 3413a coaxial with the connecting pipe 34 and an inclined surface 3413b that forms an angle with the axis of the connecting pipe 34. One end of the cylindrical surface 3413a is connected to one end of the inclined surface 3413b, and one end of the cylindrical surface 3413a away from the inclined surface 3413b is connected to the edge of the first end surface 3411. The cylindrical surface 3413a is flush with the inner wall of the insertion tube 33, and one end of the inclined surface 3413b away from the cylindrical surface 3413a is connected to the edge of the second end surface 3412.

[0065] The transition surface 3413 is composed of two parts. One end of the columnar surface 3413a connects to the edge of the first end surface 3411, and after the insertion tube 33 abuts against the first end surface 3411, it becomes flush with the inner wall of the insertion tube 33. "Flush" refers to a smooth transition between the columnar surface 3413a and the insertion tube 33, without any wavy or uneven surfaces. When the position limiting convex ring 341 is processed and molded, the transition via the columnar surface 3413a prevents the inclined surface 3413b from directly connecting to the edge of the first end surface 3411, thereby avoiding the formation of an angular structure at the connection point, making processing less difficult. The inclined surface 3413b connects the columnar surface 3413a to the edge of the second end surface 3412. After passing through the columnar surface 3413a, blood flows along the inclined surface 3413b and into the outlet tube 35. Therefore, by connecting the insertion tube 33 and the outlet tube 35, which have different inner diameters, via the position limiting convex ring 341, the blood flow passage forms a continuous passage, and the blood flows smoothly from the inner wall of the insertion tube 33 through the transition surface 3413 of the position limiting convex ring 341 and into the inner wall of the outlet tube 35, preventing blood clogging and the formation of thrombi.

[0066] Furthermore, the outlet pipe 35 is a metal pipe. The insertion pipe 33 is a flexible tube. In this embodiment, the outlet pipe 35 is specifically a plastic pipe, and the connecting pipe 34 may be a metal pipe. Since both ends of the connecting pipe 34 need to be joined with two different materials, during the joining process, the inner wall of one end of the connecting pipe 34 is glued and fixed to the outer wall of the insertion pipe 33, and the end of the connecting pipe 34 away from the insertion pipe 33 is welded and fixed to the outer wall of the connection part 351. This meets the process requirements, and the strength is also ensured by inserting the metal connecting pipe 34 into the joint between the insertion pipe 33 and the outlet pipe 35.

[0067] 20 , the connecting pipe 34 includes a first pipe section 342 and a second pipe section 343 connected to each other. The inner wall of the first pipe section 342 is connected to the outer wall of the insertion pipe 33, and the inner wall of the second pipe section 343 is connected to the outer wall of the connection section 351. A position limiting convex ring 341 is provided on the inner wall of the second pipe section 343. The first pipe section 342 and the second pipe section 343 have the same outer diameter, and the inner diameter of the first pipe section 342 is larger than the inner diameter of the second pipe section 343. The thickness of the pipe wall of the connecting pipe 34 is divided into two sections, with the thinner first pipe section 342 connected to the insertion pipe 33 and the thicker second pipe section 343 connected to the outlet pipe 35. The insertion tube 33 is a flexible tube having flexibility, and due to this characteristic, it can more easily enter curved blood vessels in the human body. The connecting tube 34 is a metal tube made of a hard material. The connecting tube 34 is fitted into the outer wall of the insertion tube 33 in its axial direction, and the fitted portion is therefore excessively stiff. Therefore, by making the thickness of the first tube portion 342 thinner, the elasticity of the first tube portion 342 is improved, and it is not too stiff and can deform adaptively when entering curved blood vessels in the human body.

[0068] Furthermore, there is a pipe gap 3421 between the inner wall of the first pipe portion 342 and the outer wall of the insertion tube 33. By leaving a certain pipe gap 3421 in the radial direction, adhesive is applied between the first pipe portion 342 and the insertion tube 33, and at the same time, after the predetermined adhesive is applied, the outer wall of the first pipe portion 342 does not expand outward, preventing the outer diameter of the adhesive application point from expanding.

[0069] Because of the pipe gap 3421, it cannot be guaranteed that the insertion pipe 33 and the connecting pipe 34 will have the same axis after they are fitted together. In a specific operation, to ensure that the two have the same axis, an auxiliary positioning tool must be used. The auxiliary positioning tool may be a cylindrical positioning post, the outer diameter of which is the same as the inner diameter of the cylindrical surface 3413a of the insertion pipe 33 or the position limiting convex ring 341. Specifically, the positioning post is first inserted so that the outer wall of the positioning post is in close contact with the cylindrical surface 3413a of the position limiting convex ring 341. Next, the insertion pipe 33 is inserted so that the inner wall of the insertion pipe 33 is in close contact with the outer wall of the positioning post. Next, adhesive is applied to the pipe gap 3421 between the insertion pipe 33 and the connecting pipe 34.

[0070] 23, the first pipe portion 342 has a plurality of lightening grooves 3422. The lightening grooves 3422 are through-holes that penetrate the inner and outer walls of the first pipe portion 342, effectively reducing the area of ​​the first pipe portion 342 and improving its elasticity. At the same time, applying adhesive to the lightening grooves 3422 on the side of the first pipe portion 342 allows the adhesive to be applied in multiple directions, resulting in a more uniform adhesive distribution and a better adhesive effect. When the adhesive is heated and dried, it expands. If the side of the first pipe portion 342 is an enclosed space, the adhesive expands, increasing its outer diameter. At this time, the lightening grooves 3422 can accommodate some of the adhesive, providing space for the adhesive to expand and preventing the outer diameter from expanding. The lightening grooves 3422 may be straight, I-shaped, or meandering, such as S-shaped or J-shaped. In the case of an arrangement, the lightening grooves 3422 may be arranged along the radial direction of the connecting pipe 34 or along the axial direction of the connecting pipe 34.

[0071] 17 and 24, the blood pump 1 further includes a catheter 40 connected to the proximal end of the drive mechanism 10. The catheter 40 houses various supply lines. For example, the supply lines include a conductor for electrically connecting to the drive mechanism 10 and a flushing line for passing a flushing fluid through the drive mechanism 10 of the blood pump 1. Preferably, the flushing fluid is saline, heparin-containing saline, glucose, or the like.

[0072] 24 to 26, the drive mechanism 10 includes a housing 100, a rotating shaft 200, a first shaft sleeve 300, a second shaft sleeve 400, and a stopper member 500. The distal end of the housing 100 is fixedly connected to the cannula assembly 30, and the proximal end of the housing 100 is fixedly connected to the catheter 40. The housing 100 is a generally cylindrical housing open at both ends. The housing 100 has a chamber 101, and the cleaning solution in the cleaning line flows into the chamber 101 from the proximal end of the housing 100 and flows out of the housing 100 via the distal end of the housing 100.

[0073] In some embodiments, the housing 100 includes a first shell 110 and a second shell 120. A proximal end of the first shell 110 is fixedly connected to the catheter 40, a distal end of the first shell 110 is fixedly connected to a proximal end of the second shell 120, and a distal end of the second shell 120 is fixedly connected to the cannula assembly 30. The first shell 110 and the second shell 120 enclose a chamber 101 of the housing 100. The housing 100 is formed by joining the first shell 110 and the second shell 120, thereby facilitating attachment of the rotating shaft 200, the first shaft sleeve 300, the second shaft sleeve 400, the stopper member 500, etc. to the chamber 101 of the housing 100.

[0074] The rotating shaft 200 is rotatably mounted in the housing 100. The rotating shaft 200 is fixedly connected to the impeller 20 and drives the rotation of the impeller 20. The rotating shaft 200 includes a shaft portion 210 and a sliding portion 220. The shaft portion 210 is rotatably mounted in the housing 100, one end of the shaft portion 210 is fixedly connected to the sliding portion 220, and the other end of the shaft portion 210 is connected to the impeller 20. The shaft portion 210 is elongated. The distal end of the shaft portion 210 is located outside the housing 100 and fixedly connected to the impeller 20. The impeller 20 can rotate according to the shaft portion 210. In the illustrated embodiment, the shaft portion 210 extends generally along the axial direction of the housing 100, or the extension direction of the axis of the shaft portion 210 and the axial direction of the housing 100 generally coincide with each other.

[0075] Sliding portion 220 has a spherical crown surface 221. The axis of shaft portion 210 passes through the center of the sphere on which spherical crown surface 221 is located. In the illustrated embodiment, the diameter of the sphere on which spherical crown surface 221 is located is larger than the diameter of shaft portion 210. Specifically, the height of spherical crown surface 221 in the axial direction of shaft portion 210 is equal to or greater than the radius of the sphere on which spherical crown surface 221 is located; in other words, the surface area of ​​spherical crown surface 221 is at least half the surface area of ​​the sphere on which it is located.

[0076] 27 , in the illustrated embodiment, the sliding portion 220 further includes a cylindrical surface 222 and a position limiting surface 223. One end of the cylindrical surface 222 is connected to the spherical crown surface 221 and the other end is connected to the position limiting surface 223. The axis of the cylindrical surface 222 overlaps with the axis of the stem portion 210, and the position limiting surface 223 is perpendicular to the axis of the stem portion 210. The position limiting surface 223 is substantially circular, and the central axis of the cylindrical surface 222 passes through the center of the sphere on which the spherical crown surface 221 is located and also passes through the center of the position limiting surface 223. In the illustrated embodiment, the diameter of the cylindrical surface 222 is equal to the diameter of the sphere on which the spherical crown surface 221 is located.

[0077] Note that the sliding part 220 is not limited to the above structure. In some embodiments, the entire sliding part 220 may have a spherical structure, in which case the spherical crown surface 221 is the surface of the part of the sliding part 220 that is away from the shank 210, and in which case the sliding part 220 does not have the position limiting surface 223 or the cylindrical surface 222. Alternatively, the sliding part 220 does not have the cylindrical surface 222, and the position limiting surface 223 is directly connected to the spherical crown surface 221. In some embodiments, the shank 210 and the sliding part 220 have an integrally molded structure, and in some embodiments, the shank 210 and the sliding part 220 may be fixedly connected together by assembly, welding, adhesive bonding, or the like. In some embodiments, the sliding part 220 has a sliding body and a diamond coating on the surface of the sliding body, making the surface of the sliding part 220 smooth and highly wear-resistant. In this case, the material of the sliding body may be a material having a certain rigidity, such as metal or ceramic, and the material of the sliding body may be the same as the material of the shaft portion 210 .

[0078] 26 and 28, in the illustrated embodiment, the first shaft sleeve 300 and the second shaft sleeve 400 are both located in the chamber 101 of the housing 100 and are distributed at intervals along the axial direction of the housing 100, with the first shaft sleeve 300 located at the proximal end of the housing 100 and the second shaft sleeve 400 located at the distal end of the housing 100. A groove 310 is formed in the first shaft sleeve 300, and the sliding portion 220 of the rotating shaft 200 is movably disposed in the groove 310, thereby restricting the first shaft sleeve 300 from moving in a direction closer to the first shaft sleeve 300. The shaft portion 210 of the rotating shaft 200 is rotatably disposed through the second shaft sleeve 400, and the second shaft sleeve 400 restricts the radial movement range of the shaft portion 210. The second shaft sleeve 400 has a shaft hole 410, and the shaft portion 210 of the rotating shaft 200 is rotatably disposed through the shaft hole 410. The diameter of the shaft hole 410 is slightly larger than the diameter of the portion of the shaft portion 210 of the rotating shaft 200 that is located in the shaft hole 410, thereby allowing rotation of the shaft portion 210 and passage of cleaning liquid. The shaft hole 410 has a fixed length along the central axis of the shaft hole 410 (in other words, the shaft hole 410 has a fixed length in the axial direction of the housing 100), thereby limiting the radial swing range of the shaft portion 210 and the radial swing range of the sliding portion 220. The radial swing range of the sliding portion 220 can be adjusted by adjusting the size of the hole diameter of the shaft hole 410 and the length of the shaft hole 410 along its central axis.

[0079] When the blood pump 1 is operating, the rotating shaft 200 yawing occurs within a certain range. Referring to FIG. 30 , the yawing range is particularly large at the end of the rotating shaft 200 away from the impeller 20 or the end of the rotating shaft 200 fitted into the first shaft sleeve 300. Therefore, in a conventional rotating shaft 200, there is a risk of the rotating shaft 200 being locked by the first shaft sleeve 300. However, in this embodiment, referring to FIGS. 29 and 31 , the spherical crown surface 221 slidably abuts against the groove wall of the groove 310. That is, the sliding part 220 yawing within the groove 310 via the spherical crown surface 221. The depth h of the groove 310 is equal to or less than the height of the spherical crown surface 221 in the axial direction of the shaft part 210. This effectively prevents the rotating shaft 200 from being locked due to contact between the portion of the rotating shaft 200 other than the spherical crown surface 221 and the opening of the groove 310. This improves the safety and reliability of the drive mechanism 10 and the blood pump 1. If the depth h of the groove 310 is greater than the height of the spherical crown surface 221 in the axial direction of the shaft portion 210, when a part of the shaft portion 210 is accommodated in the groove 310 and the rotating shaft 200 swings radially, the rotating shaft 200 is locked in the groove 310 and cannot rotate, which poses a risk of the pump stopping.

[0080] Specifically, the groove 310 is a ball head groove. The groove 310 has a spherical wall 312, and the spherical crown surface 221 of the slider 220 slidably abuts against the spherical wall 312. The radius R of the sphere on which the groove 310 is located (or the sphere on which the spherical wall 312 is located) is greater than the radius r of the sphere on which the spherical crown surface 221 is located, allowing the slider 220 to slide within the groove 310 and provide a certain radial swing space. The difference D between the radius R of the sphere on which the spherical wall 312 is located and the radius r of the sphere on which the spherical crown surface 221 is located is defined as 0.04 mm≦D≦0.06 mm. Limiting the range of D reduces the difficulty of fitting the slider 210 into the groove 310 while limiting the maximum swing angle of the rotating shaft 200, thereby ensuring the stability of the operation of the drive mechanism 10.

[0081] Specifically, the diameter of the groove 310 gradually increases along the axis of the first shaft sleeve 300 in the direction approaching the second shaft sleeve 400. In other words, the entire groove wall of the groove 310 is a substantially spherical wall 312, allowing the spherical crown surface 221 of the sliding part 220 to slide more smoothly within the groove 310. The center of the sphere where the spherical wall 312 is located is located on the central axis of the groove 310. In the illustrated embodiment, the central axis of the groove 310 overlaps with the central axis of the first shaft sleeve 300. The central axis of the groove 310 overlaps with the central axis of the shaft hole 410. In this application, the depth h of the groove 310 refers to the maximum distance from the groove wall of the groove 310 to the plane on which the groove opening of the groove 310 is located when the spherical wall 312 of the groove 310 is in a complete state (i.e., when there are no holes in the spherical wall 312), that is, referring to Figure 31, the depth h of the groove 310 refers to the height of the spherical notch on which the spherical wall 312 is located (the bottom surface of the spherical notch is flush with the plane on which the groove opening of the groove 310 is located).

[0082] In one embodiment, the depth h of the groove 310 is 0.6 to 1 times the radius R of the sphere on which the spherical wall 312 is located, i.e., 0.6R≦h≦R. This range not only allows the groove 310 to have a radial position limiting effect to prevent the sliding part 220 from sliding out of the groove 310, but also causes the diameter of the groove 310 to gradually increase along the axis of the first shaft sleeve 300 in the direction approaching the second shaft sleeve 400, thereby making it easier to insert the sliding part 220 into the groove 310, and the groove 310 has an appropriate width to meet the demand for the radial swing range of the sliding part 220.

[0083] 28 to 31, in one embodiment, the depth h of the groove 310 is equal to or greater than half the height of the spherical crown surface 221 in the axial direction of the shaft portion 210, so that the groove wall of the groove 310 has a sufficient radial width for the sliding portion 220 to slide, and prevents the sliding portion 220 from sliding out of the groove 310.

[0084] In one embodiment, the edge of the groove opening of the groove 310 is rounded, thereby forming a first rounded chamfer 311 at the edge of the groove opening of the groove 310, to prevent the sliding part 220 from being scratched and worn by the sharp edge of the groove opening. In the embodiment shown in Figure 28, the first rounded chamfer 311 is located at the far end of the spherical wall 312, so that the groove wall of the groove 310 smoothly transitions from the spherical wall 312 to the far end face of the first shaft sleeve 300.

[0085] 26 and 27 , in some embodiments, the first axial sleeve 300 further includes a flushing fluid hole 320 through which flushing fluid flows. The flushing fluid hole 320 is fluidly connected to the groove 310, and the diameter of the flushing fluid hole 320 is smaller than the diameter of the sphere where the spherical wall 312 is located. Specifically, an opening at one end of the flushing fluid hole 320 is located on the end surface of the proximal end of the first axial sleeve 300, and an opening at the other end is located on the spherical wall 312. The flushing fluid hole 320 is fluidly connected to a flushing line in the catheter 40, allowing the flushing fluid to flow into the groove 310 through the flushing fluid hole 320. The diameter of the flushing fluid hole 320 is smaller than the diameter of the sphere where the spherical crown surface 221 is located.

[0086] Specifically, the central axis of the cleaning liquid hole 320 passes through the center of the groove 310 or the center of the sphere where the spherical wall 312 is located. This allows the cleaning liquid to flow more easily between the groove wall 310 and the sliding part 220, acting as a lubricant and reducing the coefficient of friction between the sliding part 220 and the groove wall of the groove 310 or between the spherical crown surface 221 and the spherical wall 312. This not only reduces wear between the sliding part 220 and the first shaft sleeve 300, but also serves as a fluid floating support for the sliding part 220. The cleaning liquid flows out of the groove 310 through the opening of the groove 310 and into the chamber 101 of the housing 100. The cleaning liquid hole 320 is a straight hole, which reduces the energy consumption of the cleaning liquid through the cleaning liquid hole 320.

[0087] In one embodiment, the cleaning liquid hole 320 has a first opening 321, which is located at one end of the cleaning liquid hole 320 close to the groove 310, and the diameter of the first opening 321 is 1 / 9 to 1 / 3 of the diameter of the spherical crown surface 221. If the diameter of the first opening 321 of the cleaning liquid hole 320 is too large, the contact area between the sliding part 220 and the side wall of the groove 310 becomes small (the pressure received per unit area becomes large), and wear of the sliding part 220 by the groove wall of the groove 310 increases. If the diameter of the first opening 321 is too small, it will affect the amount of cleaning liquid flowing into the groove 310 from the cleaning liquid hole 320. The cleaning liquid that flows into the cleaning liquid hole 320 will impart an impact force to the sliding part 220 and simultaneously flow between the sliding part 220 and the groove wall of the groove 310 to provide lubrication and reduce the coefficient of friction between the sliding part 220 and the groove wall of the groove 310. Therefore, it is undesirable for the amount of cleaning liquid flowing into the groove 310 to be too small. Furthermore, the edge of the first opening 321 of the cleaning liquid hole 320 is provided with a second rounded chamfer to prevent scratches and wear on the sliding part 220. In the illustrated embodiment, the first opening 321 is located on the spherical wall 312. The cleaning liquid flows through the first opening 321 between the spherical wall 312 and the spherical crown surface 221 to provide lubrication.

[0088] 27 and 32 , in some embodiments, the drive mechanism 10 further includes a support seat 810. The support seat 810 is fixedly connected to the housing 100. The support seat 810 has an attachment chamber 811 and a liquid inlet hole 814 communicating with the attachment chamber 811. The first shaft sleeve 300 is attached to the attachment chamber 811, and the cleaning liquid hole 320 communicates with the liquid inlet hole 814. One end of the liquid inlet hole 814 away from the attachment chamber 811 communicates with the cleaning line of the catheter 40, so that the cleaning liquid can flow between the groove wall of the groove 310 and the sliding portion 220 through the liquid inlet hole 814 and the cleaning liquid hole 320, and then into the chamber 101 of the housing 100.

[0089] In one embodiment, the mounting chamber 811 has a chamber bottom 812, the second opening 815 of the liquid inlet hole 814 is located at the chamber bottom 812 of the mounting chamber 811, and a support step 813 is provided within the mounting chamber 811. The support step 813 abuts against the first shaft sleeve 300 to separate the first shaft sleeve 300 from the chamber bottom 812 by a certain distance, thereby ensuring smooth flow of the cleaning liquid. Specifically, the support step 813 abuts against the surface of the first shaft sleeve 300 that faces away from the second shaft sleeve 400.

[0090] Specifically, the support seat 810 is further formed with a branch channel 816, which is fluidly connected to the liquid inlet hole 814 so that a fluid (e.g., cleaning liquid) flowing through the liquid inlet hole 814 can further flow into the chamber 101 of the housing 100 via the branch channel 816. Specifically, one end of the branch channel 816 is connected to the gap between the first shaft sleeve 300 and the chamber bottom 812 of the mounting chamber 811, and the other end is connected to the chamber 101. In the embodiment shown in FIG. 32 , the branch channel 816 is formed by recessing a portion of the chamber wall of the mounting chamber 811. In other words, under normal conditions, the cleaning liquid flows from the liquid inlet hole 814 into the mounting chamber 811 and then branches into two channels. One channel flows into the groove 310 of the first shaft sleeve 300 via the cleaning liquid channel 320, and the other channel flows out via the branch channel 816. By providing the branch flow path 816, it is possible to ensure the flow of the cleaning liquid even when the sliding part 220 blocks the cleaning liquid hole 320.

[0091] 32, the number of branch flow paths 816 is two, and the two branch flow paths 816 are provided opposite each other. Note that the number of branch flow paths 816 can be adjusted according to design needs, and for example, in some embodiments, the number of branch flow paths 816 may be one or more than two.

[0092] 24 to 26, in some embodiments, the stopper member 500 is fixedly connected to the shaft portion 210, and is located between the first shaft sleeve 300 and the second shaft sleeve 400. The stopper member 500 abuts against the second shaft sleeve 400, so that the second shaft sleeve 400 can limit the range of movement of the shaft portion 210 in a direction toward the second shaft sleeve 400. Specifically, the stopper member 500 may be selected as a thrust ring 510.

[0093] In some embodiments, when the stopper member 500 abuts against the second shaft sleeve 400, the stopper member 500 does not seal the axial bore 410 of the second shaft sleeve 400, so that the cleaning liquid can flow into the axial bore 410 of the second shaft sleeve 400 through the gap between the stopper member 500 and the second shaft sleeve 400, i.e., realizing fluid communication between the axial bore 410 of the second shaft sleeve 400 and the chamber 101. Specifically, the outer diameter of the thrust ring 510 is smaller than the outer diameters of the second rotor 620 and the second shaft sleeve 400, and the outer diameter of the thrust ring 510 is larger than the bore diameter of the axial bore 410, so that the thrust ring 510 abuts against the second shaft sleeve 400 and separates the second shaft sleeve 400 from the second rotor 620 by a certain distance. Compared to direct contact between the second rotor 620 and the second shaft sleeve 400, the thrust ring 510 can reduce the friction area between the second shaft sleeve 400 and the stopper member 500.

[0094] In other embodiments, the thrust ring 510 may be formed by an arrangement of multiple sector rings, the multiple sector rings being evenly spaced around the shaft portion 210, or the thrust ring 510 may be formed by an arrangement of multiple sector rings being discretely spaced around the shaft portion 210.

[0095] 33, one surface of the stopper member 500 of the second shaft sleeve 400 is partially recessed to form a flow guide groove 420, which communicates with the axial hole 410 of the second shaft sleeve 400. When the stopper member 500 abuts against the second shaft sleeve 400, a portion of the flow guide groove 420 is not covered by the stopper member 500. For example, when the thrust ring 510 abuts against the second shaft sleeve 400, the thrust ring 510 blocks the gap between the axial hole 410 of the second shaft sleeve 400 and the shaft portion 210, but the flow guide groove 420 that is not covered by the thrust ring 510 achieves fluid communication when the thrust ring 510 abuts against the second shaft sleeve 400, ensuring smooth flow of the cleaning liquid. In addition, a portion of the surface of the second shaft sleeve 400 facing the stopper member 500 is recessed to form a guide groove 420, which allows the cleaning liquid to flow more efficiently between the stopper member 500 and the second shaft sleeve 400, thereby lubricating the contact surfaces between the stopper member 500 and the second shaft sleeve 400, reducing friction between the stopper member 500 and the second shaft sleeve 400, reducing wear problems caused by friction between the stopper member 500 and the second shaft sleeve 400, and providing a heat dissipation effect for the stopper member 500 and the second shaft sleeve 400.

[0096] 26 and 33, in some embodiments, the second shaft sleeve 400 includes a first annular body 401 and a second annular body 402, where the diameter of the first annular body 401 is smaller than the diameter of the second annular body 402, and the proximal end of the first annular body 401 is connected to the distal end of the second annular body 402. In the illustrated embodiment, the first annular body 401 and the second annular body 402 are integrally molded, and the second annular body 402 has a flow guide groove 420. The housing 100 has an attachment hole 102 that is aligned with the first annular body 401, the attachment hole 102 being located at the far end of the housing 100, and a position limiting protrusion 103 being provided on the inner wall of the housing 100, the position limiting protrusion 103 surrounding the attachment hole 102, the first annular body 401 being attached within the attachment hole 102, and the second annular body 402 abutting against the end face of the near end of the position limiting protrusion 103, thereby realizing positioning and attachment of the second shaft sleeve 400 and contributing to stable attachment of the second shaft sleeve 400.

[0097] In this embodiment, at least one of the first shaft sleeve 300, the second shaft sleeve 400, and the stopper member 500 is made of a ceramic material. Compared to metallic materials, ceramics have high processing precision, biocompatibility, and mechanical strength, as well as good wear resistance and corrosion resistance. In some embodiments, at least one of the first shaft sleeve 300 and the second shaft sleeve 400 has a shaft sleeve body and a diamond coating on the surface of the shaft sleeve body, which smooths the surface of the first shaft sleeve 300 and the second shaft sleeve 400 and improves wear resistance. In this case, the material of the shaft sleeve body may be a material with a certain rigidity, such as a metal or ceramic.

[0098] Specifically, the roughness of at least one of the hole wall of the shaft hole 410, the surface of the shaft portion 210, the surface of the sliding portion 220, and the groove wall of the groove 310 is 0.1 micrometers or less, thereby effectively reducing the friction force between the shaft portion 210 and the hole wall of the shaft hole 410, and the friction force between the sliding portion 220 and the groove wall of the groove 310.

[0099] 25, 26, and 34, the drive mechanism 10 further includes a first rotor 610. The first rotor 610 is fixedly connected to the rotating shaft 200. The first rotor 610 is located between the first shaft sleeve 300 and the second shaft sleeve 400. A gap is provided between the first rotor 610 and the first shaft sleeve 300, thereby preventing wear between the first rotor 610 and the first shaft sleeve 300 and reducing the operating resistance of the drive mechanism 10. Specifically, the first rotor 610 is fixedly connected to a position limiting surface 223 of the sliding part 220. The position limiting surface 223 increases the connection area between the first rotor 610 and the rotating shaft 200, thereby improving the connection stability of the first rotor 610. The position limiting surface 223 serves to position the first rotor 610 and limits the distance that the first rotor 610 can move along the axis of the shaft portion 210 in a direction approaching the first shaft sleeve 300. Preferably, the first rotor 610 is fixed to the position limiting surface 223 by adhesive bonding, welding, or the like. The cylindrical surface 222, which has a certain length, can increase the gap between the first rotor 610 and the first shaft sleeve 300 and prevent the first rotor 610 from contacting the first shaft sleeve 300 during swinging of the rotating shaft 200, thereby preventing sticking of the rotating shaft 200.

[0100] The first rotor 610 includes a first flywheel 611 and a first magnet 612. The first flywheel 611 is fixedly connected to the rotating shaft 200, for example, the first flywheel 611 is fixedly connected to the position limiting surface 223. The first magnet 612 is fixedly connected to the first flywheel 611. In some embodiments, the first magnet 612 is an annular Halbach array magnet. In the illustrated embodiment, the first rotor 610 is located in the chamber 101, and the first rotor 610 is rotatable relative to the housing 100 and can drive the rotation of the rotating shaft 200.

[0101] 25 and 26 , in some embodiments, the drive mechanism 10 further includes a stator 700. The stator 700 and the first rotor 610 are arranged along the axis of the shaft portion 210, and the stator 700 is located between the first shaft sleeve 300 and the second shaft sleeve 400. Specifically, the stator 700 can generate a rotating magnetic field that drives the rotation of the first magnet 612 of the first rotor 610. By arranging the first rotor 610 and the stator 700 along the axis of the shaft portion 210, the overall diameter of the drive mechanism 10 can be reduced. In the illustrated embodiment, the stator 700 is fixedly attached to the housing 100, the stator 700 is located in the chamber 101, and the shaft portion 210 is rotatably disposed through the stator 700. Preferably, the stator 700 is located between the first rotor 610 and the stopper member 500.

[0102] In some embodiments, the drive mechanism 10 further includes a second rotor 620, which is fixedly connected to the shaft 210 and is located between the first shaft sleeve 300 and the second shaft sleeve 400. In the illustrated embodiment, a stopper member 500 is located between the second rotor 620 and the second shaft sleeve 400. Because the stopper member 500 is fixedly connected to at least one of the second rotor 620 and the shaft 210, the stopper member 500, the rotating shaft 200, and the second rotor 620 rotate and move synchronously. In other words, the stopper member 500 may be directly fixed only to the second rotor 620, or only to the shaft 210, or directly fixed to both the second rotor 620 and the shaft 210 simultaneously.

[0103] 24, 25, and 35, the specific structure of the second rotor 620 includes a second flywheel 621 and a second magnet 622. The second flywheel 621 is fixedly connected to the shaft 210, and the second magnet 622 is fixedly connected to the second flywheel 621. In some embodiments, the second magnet 622 is an annular Halbach array magnet. Note that the structure of the second flywheel 621 may be the same as the structure of the first flywheel 611, and therefore, a description thereof will be omitted here.

[0104] In the illustrated embodiment, the thrust ring 510 is an annular protrusion formed on the side of the second flywheel 621 that faces away from the first rotor 610. The thrust ring 510 and the second flywheel 621 are integrally molded, which facilitates assembly and eliminates the need for a bonding operation. Alternatively, the thrust ring 510 and the second rotor 620 may be separate structures before assembly, and the thrust ring 510 may be fixed to at least one of the second rotor 620 and the shaft 210 by bonding or welding.

[0105] In some embodiments, referring to FIGS. 25, 26, and 36, a stator 700 includes a magnetic core 710 and a coil 720 wound around the magnetic core 710. The magnetic core 710 has a generally columnar structure, i.e., the magnetic core 710 does not have a wide head (i.e., a pole piece). Compared to a magnetic core 710 with a pole piece, the columnar magnetic core 710 reduces magnetic loss and increases the magnetic coupling density between the magnetic core 710 and the first magnet 612 and the second magnet 622, thereby increasing the torque of the stator 700 relative to the first magnet 612 and the second magnet 622 (under the same current conditions). Furthermore, the headless magnetic core 710 significantly reduces the problem of local magnetic short circuits and reduced motor power due to contact between adjacent magnetic cores 710. Specifically, the extension direction of the magnetic core 710 coincides with the axial direction of the housing 100 or the axis of the shaft portion 210.

[0106] The first rotor 610, the stator 700, and the second rotor 620 are arranged in this order along the axis of the shaft portion 210. In the illustrated embodiment, the stator 700 includes a first stator unit 701 and a second stator unit 702 arranged along the axis of the shaft portion 210, and the first stator unit 701 and the second stator unit 702 each include the magnetic core 710 and the coil 720. The first stator unit 701 can drive the rotation of the first rotor 610, and the second stator unit 702 can drive the rotation of the second rotor 620. The first stator unit 701 and the second stator unit 702 are both fixedly accommodated in the chamber 101 of the housing 100. The shaft portion 210 is rotatably disposed through the first stator unit 701 and the second stator unit 702. The first rotor 610, the first stator unit 701, the second rotor 620, and the second stator unit 702 are provided in this order along the axial direction.

[0107] Specifically, the drive mechanism 10 further includes a magnetically permeable member 820 fixedly connected to the housing 100, and the magnetic cores 710 of the first stator unit 701 and the second stator unit 702 are both fixedly connected to the magnetically permeable member 820. The shaft 210 is rotatably disposed through the magnetically permeable member 820. The magnetically permeable member 820 closes the magnetic path, promoting and increasing the generation of magnetic flux and improving coupling capability. Therefore, providing the magnetically permeable member 820 closes the magnetic path between the first stator unit 701 and the first rotor 610 and between the second stator unit 702 and the second rotor 620, thereby increasing the magnetic flux. Therefore, providing the magnetically permeable member 820 is advantageous in reducing the overall diameter of the drive mechanism 10. Furthermore, to realize the positioning and attachment of the first stator unit 701 and the second stator unit 702, the magnetic permeable member 820 may be directly and fixedly connected to the housing 100, thereby reducing the difficulty of assembling the first stator unit 701 and the second stator unit 702. Specifically, the magnetic permeable member 820 includes two magnetic permeable plates 821, which are stacked one on top of the other. One of the magnetic permeable plates 821 is fixedly connected to the magnetic core 710 of the first stator unit 701, and the other magnetic permeable plate 821 is fixedly connected to the magnetic core 710 of the second stator unit 702.

[0108] The drive mechanism of this embodiment has the same structure as the drive mechanism of the first embodiment, and therefore the drive mechanism of this embodiment and the blood pump including the same also achieve the same effects as the first embodiment.

[0109] The above embodiments are only for illustrating the technical solutions of the present invention, and are not intended to be limiting. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art may modify the technical solutions described in the above embodiments or make equivalent substitutions for some technical features thereof, and such modifications and substitutions shall not deviate from the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and shall all fall within the protection scope of the present invention.

Claims

1. a drive mechanism configured to drive rotation of an impeller, said drive mechanism comprising: Housing and a rotating shaft rotatably mounted to the housing and having a connection end configured to connect to the impeller and a ball head end remote from the connection end; a rotor fixedly connected to the rotary shaft; a first shaft sleeve and a second shaft sleeve, both of which are attached to the housing, the first shaft sleeve having a groove formed therein, the groove having a concave spherical wall, the rotation shaft rotatably passing through the second shaft sleeve, the ball head end movably mounted in the groove and capable of contacting the spherical wall, and the rotor being located between the first shaft sleeve and the second shaft sleeve; a stopper member fixedly connected to at least one of the rotary shaft and the rotor, positioned between the rotor and the second shaft sleeve, and capable of abutting against the second shaft sleeve; the rotating shaft includes a shaft portion and a sliding portion provided at one end of the shaft portion, the shaft portion is rotatably provided through the second shaft sleeve, the one end of the shaft portion remote from the sliding portion is the connecting end, the sliding portion is the ball head end, and the sliding portion has a spherical crown surface; a depth of the recessed groove is equal to or less than a height of the spherical crown surface in the axial direction of the shaft portion, the sliding portion is movably provided in the recessed groove, the spherical crown surface is in slidable contact with a spherical wall of the recessed groove, and the stopper member is fixedly connected to the shaft portion.

2. a fluid passage hole communicating with the groove is further formed in the first shaft sleeve, and an opening of the fluid passage hole is located in the spherical wall; 2. The drive mechanism according to claim 1, wherein the opening is located at the center of the spherical wall, and / or the diameter of the opening is 1 / 9 to 1 / 3 of the diameter of the sphere on which the ball head end is located.

3. 2. The drive mechanism according to claim 1, wherein the first shaft sleeve further has a fluid passage hole communicating with the groove, the drive mechanism further includes a support seat fixedly connected to the housing, the support seat having a mounting chamber and a fluid inlet hole communicating with the mounting chamber, the first shaft sleeve is attached to the mounting chamber, and the fluid passage hole is in fluid communication with the fluid inlet hole.

4. the mounting chamber has a chamber bottom, an opening of the liquid inlet hole is located at the chamber bottom, a support step portion is provided within the mounting chamber, the support step portion abuts against the first shaft sleeve and separates the first shaft sleeve from the chamber bottom by a certain distance, and / or a branch flow path is further formed in the support seat, and the branch flow path is connected to the liquid inlet hole, thereby allowing the fluid that has flowed into the liquid inlet hole to flow into the housing via the branch flow path.

5. 2. The drive mechanism according to claim 1, wherein the second shaft sleeve has a shaft hole and a locking surface perpendicular to the central axis of the shaft hole, the rotating shaft is rotatably disposed through the shaft hole, the stopper member has a stopper surface perpendicular to the axis of the rotating shaft, the stopper surface faces the locking surface and is capable of abutting against the locking surface.

6. the roughness of at least one of the stopper surface and the engagement surface is 0.1 micrometers or less; Alternatively, at least one of the stopper surface and the engagement surface is a ceramic surface, 6. The drive mechanism according to claim 5, wherein the material of the stopper surface is diamond.

7. a partition ring is provided within the housing, the partition ring divides a chamber of the housing into a position limiting chamber and an accommodating chamber, the position limiting chamber and the accommodating chamber are provided along the axis of the rotating shaft, the second shaft sleeve is accommodated within the position limiting chamber and abuts against the partition ring, and the rotor is accommodated in the accommodating chamber, so that the partition ring is located between the second shaft sleeve and the rotor; 2. The drive mechanism according to claim 1, wherein when the stopper member abuts against the second shaft sleeve, at least a portion of the stopper member is located on an inner ring of the partition ring, there is a gap between the stopper member and the inner ring wall of the partition ring through which a fluid can flow, and there is a certain distance between the partition ring and the rotor.

8. 8. The drive mechanism according to claim 7, wherein a shaft hole is formed in the second shaft sleeve, the rotating shaft is rotatably disposed through the shaft hole, a gap through which a fluid flows is formed between the rotating shaft and a hole wall of the shaft hole, a portion of a surface of the second shaft sleeve facing the stopper member is recessed to form a flow guide groove, the flow guide groove communicates with the shaft hole, and when the stopper member abuts against the second shaft sleeve, a portion of the flow guide groove is not covered by the stopper member.

9. the rotor includes a first rotor and a second rotor provided along the axis of the rotary shaft, the first rotor and the second rotor are both fixedly connected to the rotary shaft, the first rotor and the second rotor are both positioned between the first shaft sleeve and the second shaft sleeve, and the stopper member is positioned between the second rotor and the second shaft sleeve; the drive mechanism further includes a stator capable of driving the rotor to rotate, the stator including a first stator unit and a second stator unit provided along an axis of the rotation shaft, the first stator unit and the second stator unit both being located between the first rotor and the second rotor, the first stator unit being capable of driving the first rotor to rotate, the second stator unit being capable of driving the second rotor to rotate, and the first stator unit and the second stator unit both including a magnetic core and a coil wound around the magnetic core, 2. The drive mechanism according to claim 1, further comprising a magnetically permeable member fixedly connected to the housing, wherein the magnetic core of the first stator unit and the magnetic core of the second stator unit are both fixedly connected to the magnetically permeable member, and the rotating shaft is rotatably disposed to pass through the first stator unit, the second stator unit, and the magnetically permeable member.

10. 2. The drive mechanism according to claim 1, wherein the spherical crown surface slidably contacts the spherical wall, the radius of the sphere on which the spherical wall is located is larger than the radius of the sphere on which the spherical crown surface is located, and the diameter of the groove gradually increases along the axis of the first shaft sleeve in a direction approaching the second shaft sleeve.

11. a depth of the recessed groove is equal to or greater than half the height of the spherical crown surface in the axial direction of the shaft portion; And / or, the groove has a groove opening, the edge of the groove opening is rounded and the sliding portion is provided so as to penetrate the groove opening of the groove, The drive mechanism of claim 1 characterized by the above-mentioned.

12. the spherical crown surface is in slidable contact with the spherical wall, and when a difference D between a radius of a sphere on which the spherical wall is located and a radius of a sphere on which the spherical crown surface is located is defined as D, 0.04 mm≦D≦0.06 mm is satisfied; and / or the spherical crown surface is in slidable contact with the spherical wall, and the depth of the groove is 0.6 to 1 times the radius of a sphere on which the spherical wall is located.

13. 2. The drive mechanism according to claim 1, wherein the rotor includes a first rotor and a second rotor, the first rotor is fixedly connected to the shaft portion, the first rotor is located between the first shaft sleeve and the second shaft sleeve, there is a gap between the first rotor and the first shaft sleeve, the second rotor is located between the first shaft sleeve and the stopper member, and at least one of the stopper member and the second shaft sleeve is made of a ceramic material.

14. 14. The drive mechanism according to claim 13, wherein the sliding portion further includes a cylindrical surface and a position limiting surface, one end of the cylindrical surface is connected to the spherical crown surface and the other end is connected to the position limiting surface, an axis of the cylindrical surface overlaps with an axis of the shaft portion, the position limiting surface is perpendicular to the axis of the shaft portion, and the first rotor abuts against the position limiting surface.

15. A blood pump including an impeller and a drive mechanism, the drive mechanism comprising: Housing and a rotating shaft rotatably mounted to the housing and having a connection end configured to connect to the impeller and a ball head end remote from the connection end; a rotor fixedly connected to the rotary shaft; a first shaft sleeve and a second shaft sleeve, both of which are attached to the housing, the first shaft sleeve having a groove formed therein, the groove having a concave spherical wall, the rotation shaft rotatably passing through the second shaft sleeve, the ball head end movably mounted in the groove and capable of contacting the spherical wall, and the rotor being located between the first shaft sleeve and the second shaft sleeve; a stopper member fixedly connected to at least one of the rotary shaft and the rotor, positioned between the rotor and the second shaft sleeve, and capable of abutting against the second shaft sleeve; the rotating shaft includes a shaft portion and a sliding portion provided at one end of the shaft portion, the shaft portion is rotatably provided through the second shaft sleeve, the one end of the shaft portion remote from the sliding portion is the connecting end, the sliding portion is the ball head end, and the sliding portion has a spherical crown surface; a depth of the recessed groove is equal to or less than a height of the spherical crown surface in the axial direction of the shaft portion, the sliding portion is movably provided in the recessed groove, and the spherical crown surface slidably abuts against a spherical wall of the recessed groove, and the stopper member is fixedly connected to the shaft portion, The blood pump, characterized in that the impeller is connected to the connection end of the rotation shaft and can rotate along the rotation shaft.

16. 16. The blood pump according to claim 15, further comprising a cannula assembly connected to the drive mechanism, the cannula assembly including an insertion tube, a connecting tube fitted to the insertion tube, and an outlet tube fitted to the connecting tube, an inner wall of one end of the connecting tube being connected to an outer wall of the insertion tube, the outlet tube including a connecting portion and an outlet portion remote from the connecting tube, an outer wall of the connecting portion being connected to an inner wall of the one end of the connecting tube remote from the insertion tube, and the impeller being rotatably mounted on the outlet tube.

17. 17. The blood pump according to claim 16, wherein a position limiting convex ring is provided on an inner wall of the connecting tube, the position limiting convex ring being provided so as to protrude in an annular shape from the inner wall of the connecting tube, the position limiting convex ring having a first end face and a second end face provided along the axial direction of the connecting tube, the first end face abutting against the end of the insertion tube, and the second end face abutting against the end of the connection portion.

18. 18. The blood pump according to claim 17, wherein the first end surface protrudes radially from the inner wall of the connecting tube more than the second end surface, and an edge portion of the first end surface and an edge portion of the second end surface are connected via a transition surface, the edge portion of the first end surface is flush with the inner wall of the insertion tube, and the edge portion of the second end surface is flush with the inner wall of the outlet tube, and the transition surface is provided as one of a convex curved surface, a concave curved surface, and an inclined surface.

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