Driving 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) The present application relates to the technical field of medical equipment, 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 vessel, for example, the femoral or axillary artery or vein, and can be inserted into the patient's heart to function as a left ventricular assist device or a right ventricular assist device, and thus may be referred to as an intracardiac or 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. In order to achieve 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 makes the structure of the drive mechanism complex. 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 having 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] An embodiment of a second aspect of the present application provides a blood pump including an impeller and the drive mechanism according to the first aspect, 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 the description of the embodiments or the 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 description of the drawings]

[0010] [Figure 1] 1 is a structural schematic diagram of a blood pump according to an embodiment of the present invention. [Diagram 2]2 is a cross-sectional view of the blood pump shown in FIG. 1 with the cannula, impeller, and some catheters omitted. [Diagram 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, the stopper member, the rotor, the first shaft sleeve, and the second shaft sleeve shown in FIG. 1 assembled together. [Diagram 5] FIG. 5 is a partial enlarged view of part A shown in FIG. [Figure 6] FIG. 2 is a schematic diagram showing the structure of a 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 diagram of a structure in which the second rotor shown in FIG. 7 and one magnetic permeable plate of a magnetic permeable member are assembled. [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. [Figure 14] FIG. 14 is a partial enlarged view of part C shown in FIG. [Figure 15] 14 is a structural schematic diagram of the support seat of the blood pump shown in FIG. 13. [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] 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 a portion 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] 22 is a schematic diagram of the internal structure of the connecting pipe shown in FIG. 21. [Figure 23] 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 an insertion tube and a connecting tube. [Diagram 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] 18 is a cross-sectional view of the blood pump shown in FIG. 17 omitting an insertion tube, a connecting tube, and some catheters. [Figure 27] FIG. 27 is a partially enlarged view of a portion E shown in FIG. 26. [Figure 28] FIG. 27 is a schematic diagram of an assembled structure of the rotating shaft, the first shaft sleeve, and the second shaft sleeve shown in FIG. 26. [Figure 29] FIG. 29 is a schematic diagram of an assembled structure of the first shaft sleeve and a part of the rotating shaft shown in FIG. 28. [Diagram 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. [Diagram 31] FIG. 27 is a cross-sectional view of the first shaft sleeve shown in FIG. 26. [Diagram 32] FIG. 27 is a schematic diagram showing the structure of the support seat shown in FIG. 26. [Diagram 33] FIG. 27 is a schematic diagram showing the structure of the second shaft sleeve shown in FIG. 26. [Diagram 34] FIG. 27 is a schematic diagram of the structure of the first rotor shown in FIG. 26. [Diagram 35] FIG. 27 is a schematic diagram of the structure of the second rotor shown in FIG. 26. [Diagram 36] FIG. 27 is an exploded view of the stator and the magnetic permeable member shown in FIG. 26. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[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 in this specification are only for 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 indicate or imply a relative importance or number of technical features being presented. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "plurality" means two or more, unless otherwise specified.

[0014] In the following, the technical means 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] A drive mechanism 10 and a blood pump 1 according to an embodiment of the present invention will be described.

[0017] Referring to FIG. 1, 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 the drive mechanism 10 can drive the rotation of the impeller 20. Specifically, the blood pump 1 further includes a cannula 40 fixedly connected to a distal end of the drive mechanism 10. The impeller 20 is rotatably accommodated within the cannula 40. The cannula 40 has a blood outlet 41 and a blood inlet 42. When the impeller 20 rotates, blood flows into the cannula 40 from the blood inlet 42 and then flows out through the blood outlet 41. In one embodiment, the cannula 40 is inserted to extend into a heart valve, for example, an aortic valve, the blood inlet 42 is located within the heart, and the blood outlet 41 and the drive mechanism 10 are located in a blood vessel, such as the aorta, outside the heart. Specifically, the blood pump 1 further includes a catheter 50 connected to a proximal end of the 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 in 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 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. 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 and the axial direction of the housing 100 generally coincide with each other. The position limiting chamber 112 and the accommodation 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 accommodation 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 in the receiving chamber 114. Specifically, the impeller 20 is fixedly connected to the connecting end 210 so that the impeller 20 can rotate according to the rotating shaft 200. In some embodiments, the rotating shaft 200 is made of a ceramic material. Compared with metal materials, ceramics have high processing precision, high biocompatibility and 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 receiving chamber 114. The rotating shaft 200 is provided rotatably 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 receiving chamber 114. The rotor 400 is fixedly connected to the rotating shaft 200, the stator 300 can drive the rotation of the rotor 400, and the rotor 400 can drive the rotation of the rotating shaft 200. Specifically, the rotor 400 has magnetism, and the stator 300 can generate a rotating magnetic field that drives the rotation of the rotor 400.

[0021] Referring to FIG. 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. Both of 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 provided along the axis of the rotating shaft 200. The stator 300 is located between the first rotor 410 and the second rotor 420. Both of the first rotor 410 and the second rotor 420 are 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 to reduce shaking during rotation of the rotating shaft 200, thus making the entire rotating shaft 200 more stable during rotation.

[0022] 9, specifically, the first flywheel 412 includes a first built-in tube 4121, a first disk portion 4122, and a first outer annular wall 4123, and both the first built-in tube 4121 and the first outer annular wall 4123 are of a circular tubular structure, and the first disk portion 4122 is of an annular disk structure. The first built-in tube 4121 and the first outer annular wall 4123 are both fixedly connected to the first disk portion 4122. The first outer annular wall 4123 is provided to surround the first disk portion 4122, and both the first built-in tube 4121 and the first outer annular wall 4123 are provided coaxially, and the rotating shaft 200 is provided penetrating the first built-in tube 4121 and fixedly connected to the first built-in tube 4121. A first annular chamber 4124 is formed between the first built-in tube 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 play a position limiting role on 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] The first flywheel 412 is not limited to the above structure, and in some embodiments, the first flywheel 412 does not have the first outer ring wall 4123, and in some embodiments, the first flywheel 412 does not have the first outer ring wall 4123 and the first built-in tube 4121, and at this time, the rotating shaft 200 is fixedly provided through the center of the first disk portion 4122. By providing the first built-in tube 4121 for the first flywheel 412 having only the first disk portion 4122, the first flywheel 412 and the rotating shaft 200 can be connected more stably. The second rotor 420 includes a second magnet 421, and the second magnet 421 is fixedly connected to the rotating shaft 200. Specifically, the second magnet 421 is an annular Halbach array magnet. Specifically, the second rotor 420 further includes a second flywheel 422, which is fixedly connected to the rotating shaft 200, and the second magnet 421 is fixed to the second flywheel 422. By providing the second flywheel 422, the connection strength between the second magnet 421 and the rotating shaft 200 can be increased, and shaking of the rotating shaft 200 during rotation can also be reduced, making the entire rotating shaft 200 more stable during rotation.

[0024] Specifically, referring to FIG. 4, the second flywheel 422 includes a second built-in tube 4221, a second disk portion 4222, and a second outer annular wall 4223, and both the second built-in tube 4221 and the second outer annular wall 4223 are of a circular tubular structure, and the second disk portion 4222 is of an annular disk structure. The second built-in tube 4221 and the second outer annular wall 4223 are both fixedly connected to the second disk portion 4222. The second outer annular wall 4223 is provided to surround the second disk portion 4222, and both the second built-in tube 4221 and the second outer annular wall 4223 are provided coaxially, and the rotating shaft 200 is provided penetrating the second built-in tube 4221 and fixedly connected to the second built-in tube 4221. A second annular chamber is formed between the second built-in tube 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 so as to facilitate the installation and positioning of the second magnet 421. In this way, the second flywheel 422 can play a position limiting role on the second magnet 421, which not only facilitates the installation of the second magnet 421 but also makes the coupling 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 and the second built-in tube 4221, and in this case, the rotating shaft 200 is fixedly provided to penetrate through the center of the second disk portion 4222. By providing the second built-in tube 4221 to the second flywheel 422 having only the second disk 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 provided along the axis of the rotating shaft 200, and 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 accommodation chamber 114 of the housing 100. The rotating shaft 200 is provided to rotatably penetrate 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 a plurality of first magnetic cores 312, and the plurality of first magnetic cores 312 are provided around the axis of the rotating shaft 200. Each of the first magnetic cores 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 of the second magnetic cores 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 in the housing 100, and is engaged with, for example, an inner wall of the housing 100. The rotating shaft 200 is provided rotatably penetrating 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 provided 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 provided adjacent to the other end of the second magnetic core 322.

[0029] The magnetic permeable member 700 plays a role in closing the magnetic path, promoting and increasing the generation of magnetic flux, and improving the coupling ability. Therefore, the provision of the magnetic permeable member 700 plays a role in closing 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, and can increase the magnetic flux. Therefore, the provision of the magnetic permeable member 700 is advantageous in reducing the overall diameter of the drive mechanism 10. In addition, 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 mounting of the first stator unit 310 and the second stator unit 320 can be realized, and the difficulty of assembling the first stator unit 310 and the second stator unit 320 can be reduced. At the same time, the magnetic 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, the two magnetic permeable plates 710 are stacked, one magnetic permeable plate 710 is fixedly connected to the first magnetic core 312 of the first stator unit 310, and the other magnetic permeable plate 710 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. By doing so, when assembling the drive mechanism 10, the first magnetic core 312 can first be 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, the two magnetically permeable plates 710 are fixedly connected, so that the first stator unit 310, the second stator unit 320, and the magnetically permeable member 700 are integrated and assembled in the housing 100, making it easier to assemble the stator 300. For example, the two magnetically permeable plates 710 may be connected by adhesion or welding. In other embodiments, the two magnetically permeable plates 710 are not fixedly connected and are in contact with each other. The magnetically permeable member 700 is not limited to the above-mentioned method of combining two separate magnetically permeable plates 710, and the magnetically 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 magnetically permeable member 700, that is, the first stator unit 310 and the second stator unit 320 share one magnetically permeable member 700.

[0032] Specifically, the material of the magnetic permeable plate 710 is silicon steel, and the material of the first magnetic core 312 and the second magnetic core 322 is also 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 from each other 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 being provided adjacent to the first shaft sleeve 510, and the second rotor 420 being provided adjacent 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 provided in order along the axis of the rotating shaft 200, and the second shaft sleeve 510 is closest to the connecting 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, limiting the range in which the rotating shaft 200 moves along the axis of the rotating shaft 200 in a direction away from the impeller 20, and limiting the swing range 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, the groove wall at the groove opening 512a of the groove 512 is rounded, thereby preventing the rotating shaft 200 from being scratched and worn by the groove opening 512a of the groove 512 having 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 mouth 512a of the groove 512 to the spherical wall 514), thereby better restricting the ball head end 220 in the groove 512 and reducing the swing range of the rotating shaft 200 in the radial direction. However, in order to avoid the length of the rotating shaft 200 located in the groove 512 being too long, the depth of the groove 512 is not too large, otherwise the length of the rotating shaft 200 may be 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 located is larger than the radius of the sphere on which the ball head end 220 is located. 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 liquid passage hole 516 communicating with the groove 512. The liquid passage hole 512 can communicate with a cleaning line in the catheter 50, so that the cleaning liquid can flow into the groove 512 through the liquid passage hole 516. When the cleaning liquid flows between the groove wall of the groove 512 and the ball head end 220, it can play a lubricating role, reducing the friction between the ball head end 220 and the groove wall of the groove 512, and reducing the wear of 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 flowing 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 energy consumption of the cleaning liquid in liquid passage hole 516.

[0039] Specifically, the aperture 516a of the fluid passage hole 516 located in the spherical wall 514 is 1 / 9 to 1 / 3 of the diameter of the sphere on which the ball head end 220 is located (the diameter of the ball head end 220 is the diameter of the sphere on which the ball head end 220 is located). In the illustrated embodiment, the aperture diameter of the fluid passage hole 516 is constant, that is, the aperture diameter of the fluid passage hole 516 is 1 / 9 to 1 / 3 of the diameter of the ball head end 220. If the aperture 516a of the fluid passage hole 516 located in the spherical wall 514 is too large, the contact surface between the ball head end 220 and the spherical wall 514 becomes small, which increases the wear of the ball head end 220 caused by the spherical wall 514. If the diameter of opening 516a is too small, it will affect the amount of cleaning liquid flowing 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, while also flowing 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 not preferable for the amount of cleaning liquid flowing 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 an attachment chamber 810 and a liquid inlet hole 820 communicating with the attachment chamber 810, and the first shaft sleeve 510 is attached to the attachment chamber 810. The liquid passage hole 516 communicates with the liquid inlet hole 820. One end of the liquid inlet hole 820 away from the attachment chamber 810 communicates with the flushing line of the catheter 50 so that the flushing liquid flows into the gap between the groove wall of the concave groove 512 and the ball head end 220 through the liquid inlet hole 820 and the liquid passage hole 516, and then flows 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 is away from the second shaft sleeve 520.

[0042] Specifically, the support seat 800 is further formed with a branch passage 830, which is fluidly connected to the liquid inlet hole 820, so that the cleaning liquid flowing through the liquid inlet hole 820 can further flow into the chamber of the housing 100 through the branch passage 830. Specifically, one end of the branch passage 300 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 passage 830 is formed by recessing a part 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, one of which flows into the recessed groove 512 of the first shaft sleeve 510 through the liquid passage hole 516, and the other flows out through the branch passage 830. By providing the branch flow passage 830, it is possible to ensure the flow of the cleaning liquid in a state where the ball head end 220 blocks the liquid passage hole 516. In the illustrated embodiment, the number of branch flow passages 830 is two, and the two branch flow passages 830 are provided opposite to each other. Note that the number of branch flow passages 830 can be adjusted according to design needs, and for example, in some embodiments, the number of branch flow passages 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 makes it easy to position the second shaft sleeve 520 and assemble the second shaft sleeve 520. The second shaft sleeve 520 has a shaft hole 522 formed therein, and the rotating shaft 200 is provided to rotatably pass 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. Between the hole wall of the shaft hole 522 of the second shaft sleeve 520 and the rotating shaft 200, there is a gap through which a fluid flows. 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 exit 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, may be directly fixed only to the rotating shaft 200, or may be directly fixed simultaneously to both the rotor 400 and the rotating shaft 200. Since 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 the stopper member 600 abuts against the second shaft sleeve 520 to restrict the 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 approaching 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 position restriction on the axis of the rotating shaft 200 relative to the rotating shaft 200. In addition, since the rotating shaft 200 is inserted through the second shaft sleeve 520 and the ball head end 220 of the rotating shaft 200 is inserted into 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 the overall limit of the swing range of the rotating shaft 200 in the radial direction. In other words, the above design not only realizes the axial position limit for the rotating shaft 200, but also realizes the radial position limit 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. Since the overall volume of the blood pump 1 is small, the volume of the stopper member 600 is smaller, the processing accuracy is difficult, and the assembly is difficult, if the stopper member 600 and the second flywheel 422 are integrally molded, it is easy to install and the adhesive operation is omitted.

[0047] Specifically, when the stopper member 600 abuts against the second shaft sleeve 520, at least a part of the stopper member 600 is located in the inner ring of the partition ring 120, there is a gap between the stopper member 600 and the inner ring wall of the partition ring 120 through which a fluid flows, and there is a certain distance between the partition ring 120 and the rotor 400. By having a gap between the stopper member 600 and the inner ring wall of the partition ring 120 through which a fluid flows, the cleaning liquid can flow into the gap between the hole walls of the shaft hole 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, that is, the fluid communication between the shaft hole 522 of the second shaft sleeve 520 and the receiving chamber 114 is realized. In addition, 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, so that when the stopper member 600 abuts against the second shaft sleeve 520, the rotor 400 and the partition ring 120 are prevented from coming into contact with each other and causing wear. 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, so that there is a gap between the stopper member 600 and the inner wall of the partition ring 120 through which a fluid can flow. In another embodiment, the stopper member 600 may be formed by arranging a plurality of sector rings, and the plurality of sector rings may be arranged around the rotating shaft 200 at equal intervals, or may be arranged by arranging a plurality of sector rings that are 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 the 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 flow of the cleaning liquid being obstructed due to 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, 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, and can ensure smooth flow of the 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 providing a lubricating effect on 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 faces 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. Since 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, 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 with each other, 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 part 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. By reducing the roughness of at least one of the stopper surface 610 and the locking surface 526, the friction force between the stopper surface 610 and the locking surface 526 can be effectively reduced, and the problem of wear caused by friction between the second shaft sleeve 520 and the stopper member 600 can be reduced.

[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. At this time, 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 is realized as a ceramic surface by providing a ceramic coating. In some embodiments, the material of the stopper surface 610 is diamond, so that the stopper surface 610 has high hardness, a smooth surface, and is not easily worn, and at this time, the material of the stopper surface 610 is realized as a ceramic surface by providing a diamond coating.

[0053] The structure of the drive mechanism 10 is not limited to the above structure. In some embodiments, the number of the rotors 400 and the number of the stators 300 are both one, and 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 the first rotor 410 and the second rotor 420, but the stator unit of the stator 300 is one, and 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 the drive mechanism 10 can drive 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 provided at a distal end of the cannula assembly 30, and the blood outlet 32 ​​is located at a proximal end of the cannula assembly 30. The number of the blood outlets 32 is multiple, and the multiple blood outlets 32 are distributed at intervals along the circumferential direction of the cannula assembly 30. When the impeller 20 rotates, blood flows into the cannula assembly 30 from 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 an inner wall of one end of the connecting tube 34 is connected to an outer wall of the insertion tube 33. Specifically, the insertion tube 33 has a proximal end and a distal end, 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 into the connecting tube 34, so that the outer wall of the connection portion 351 is connected to the inner wall of one end of the connecting tube 34 remote from the insertion tube 33. One 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 in the outlet tube 35, or the impeller 20 is partially disposed in the outlet tube 35 and partially disposed in the insertion tube 33. The blood outlet 32 ​​is located at the outlet portion 352. The multiple blood flow outlets 32 are uniformly provided in the outlet section 352 in the circumferential direction of the outlet tube 35, and the impeller 20 is rotationally driven by the drive mechanism 10, whereby blood flows in through the blood inlet 31, passes through the insertion tube 33 and flows out through the multiple blood flow outlets 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 pipe diameters of the two 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 needs to have the port diameter of the insertion pipe 33 enlarged by a molding process to match it with the outlet pipe 35. This makes the process complicated, the connection unstable, and the strength of the molding part 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 connection part 351 of the outlet tube 35 is connected to the inner wall of the other end of the connecting tube 34, so that the insertion tube 33 and the outlet tube 35 can be fixedly connected to form a continuous tube, and the step of performing a molding process on the insertion tube 33 to directly fit the insertion tube 33 and the outlet tube 35 is omitted, 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 on the inner wall of the connecting pipe 34 so as to protrude in an annular shape, 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 abuts against the end of the insertion pipe 33, and the second end face 3412 abuts against the end of the connection part 351. The outer diameter of the connection part 351 is smaller than the outer diameter of the outlet part 352. One end of the connecting pipe 34 away from the insertion pipe 33 abuts against one end of the outlet part 352 close to the connection part 351, and the outer wall of the connecting pipe 34 is flush with the outer wall of the outlet part 352. Specifically, the connection part 351 and the outlet part 352 have the same inner diameter, and the position limiting convex ring 341 has a certain 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 fitted into the connecting tube 34 respectively, the position limiting convex ring 341 can simultaneously limit the position of the outlet tube 35 and the insertion tube 33 in the axial direction, thereby controlling the fitting depth of the outlet tube 35 and the insertion tube 33 and playing the role of pre-positioning, and 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 part 352, and act together with the position limiting convex ring 341 to form position limits in two axial directions, making the fit more stable. At this time, the outer wall of the connecting pipe 34 and the outer wall of the outlet portion 352 are flush with each other, and the outer wall of the connecting pipe 34 and the outer wall of the outlet portion 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, makes the transition at the connection point smooth, and avoids the wavy step parts from being uneven when entering 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 away from drive mechanism 10 does not exceed one end of connection portion 351 away from drive mechanism 10. Specifically, impeller 20 further includes hub 22, and blade 21 is wound around hub 22 in a spiral shape. A portion of impeller 20 is disposed in outlet pipe 35, and drive mechanism 10 drives impeller 20 to rotate. When the impeller 20 rotates, it vibrates and yawing occurs, so it is necessary to provide a certain distance between the impeller 20 and the inner wall of the outlet pipe 35, and to ensure that the blade 21 does not collide with the inner wall of the outlet pipe 35 even when the maximum yawing occurs in the impeller 20. The inner wall of the pipe where the position limiting convex ring 341 is located is narrow, the blade 21 has a certain height in the axial direction of the outlet pipe 35, the blade 21 occupies a certain width in the radial direction of the outlet pipe 35, and the highest point of the blade 21 in the axial direction does not extend from the outlet pipe 35, so that the blade 21 does not contact the position limiting convex ring 341. In addition, the position limiting convex ring 341 is not limited to the complete circular ring structure in the above embodiment, and may be a structure of multiple bosses that are not connected to each other and are arranged at equal intervals, and material can be saved under the condition of ensuring the position limit. The position limiting convex ring 341 may be a structure that is connected to the connecting pipe 34 alone, or a structure that is integrally molded with the connecting pipe 34, and the strength is higher when it is integrally molded.

[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 dimensions and specifications of the insertion tube 33 and the outlet tube 35 are different. Since the inner diameters of the two are different, that is, 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 needs to be flush with the inner wall of the insertion tube 33, and the edge of the second end face 3412 needs to 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 is made 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 to form thrombi.

[0062] More specifically, since the first end face 3411 and the second end face 3412 have different widths, 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, and blood can flow directly along the transition surface 3413, and there is no risk of blood clogging due to the formation of a dead space and forming a thrombus.

[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 columnar surface 3413a coaxial with the connecting tube 34 and an inclined surface 3413b forming an angle with the axis of the connecting tube 34. One end of the columnar surface 3413a is connected to one end of the inclined surface 3413b, and one end of the columnar surface 3413a away from the inclined surface 3413b is connected to the edge of the first end surface 3411. The columnar surface 3413a is flush with the inner wall of the insertion tube 33, and one end of the inclined surface 3413b away from the columnar 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 is connected to the edge of the first end surface 3411, and becomes flush with the inner wall of the insertion tube 33 after the insertion tube 33 abuts against the first end surface 3411. Flush means that the connection surface between the columnar surface 3413a and the insertion tube 33 transitions smoothly and has no wavy steps. When processing and forming the position limiting convex ring 341, the transition is made by the columnar surface 3413a, and the inclined surface 3413b is directly connected to the edge of the first end surface 3411, which avoids the formation of an angular structure at the connection point, and the processing difficulty is low. The inclined surface 3413b connects the columnar surface 3413a and the edge of the second end surface 3412, and at this time, the blood flows along the inclined surface 3413b after passing through the columnar surface 3413a and flows 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, thereby preventing blood clogging and the formation of blood clots.

[0066] Furthermore, the outlet pipe 35 is a metal pipe. The insertion pipe 33 is a flexible tube having flexibility. 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, in 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, which meets the process requirements and ensures the strength by fitting 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 outer diameters of the first pipe section 342 and the second pipe section 343 are the same, 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 parts, and the first pipe section 342, which is thinner, is connected to the insertion pipe 33, and the second pipe section 343, which is thicker, is 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 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 the first tube portion 342 is not too hard and can adaptively deform when entering the curved blood vessels of 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 a predetermined adhesive is applied, the outer wall of the first pipe portion 342 does not expand outward, avoiding expansion of the outer diameter of the adhesive application point.

[0069] Due to the pipe gap 3421, it cannot be guaranteed that the axis of the insertion pipe 33 and the connecting pipe 34 is the same after they are fitted together, and in a specific operation process, an auxiliary positioning tool needs to be used to ensure that the axis of the insertion pipe 33 and the connecting pipe 34 are the same, and the auxiliary positioning tool may be a cylindrical positioning post, and the outer diameter of the positioning post is the same as the inner diameter of the columnar surface 3413a of the position limiting convex ring 341 or the position limiting convex ring 341. Specifically, the positioning post is first inserted to make the outer wall of the positioning post adhere to the columnar surface 3413a of the position limiting convex ring 341, then the insertion pipe 33 is inserted to make the inner wall of the insertion pipe 33 adhere to the outer wall of the positioning post, and then adhesive is applied into the pipe gap 3421 between the insertion pipe 33 and the connecting pipe 34.

[0070] Further, referring to FIG. 23, the first pipe portion 342 is formed with a plurality of lightening grooves 3422. The lightening grooves 3422 are through grooves penetrating the inner and outer walls of the first pipe portion 342, and can effectively reduce the area of ​​the first pipe portion 342 and improve the elasticity of the first pipe portion 342. At the same time, in the process of applying the adhesive, the adhesive can be applied in multiple directions by applying the adhesive to the lightening grooves 3422 on the side surface of the first pipe portion 342, so that the adhesive can be applied more uniformly and the adhesive effect is better. In addition, when the adhesive is heated and dried, the adhesive expands, and if the side surface of the first pipe portion 342 is an enclosed space, the adhesive expands and increases the outer diameter, and at this time, the lightening grooves 3422 provided can also accommodate a part of the adhesive, and have a space in which the adhesive can swell, and do not cause the outer diameter to increase. The lightening grooves 3422 may be straight grooves in the shape of the letter "I", or may be meandering curved grooves such as "S" and "J". 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 a 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 with both ends open. 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 surround 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 provided 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 attached to 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 are generally coincident.

[0075] The sliding portion 220 has a spherical crown surface 221. The axis of the shaft portion 210 passes through the center of the sphere on which the spherical crown surface 221 is located. In the illustrated embodiment, the diameter of the sphere on which the spherical crown surface 221 is located is larger than the diameter of the shaft portion 210. Specifically, the height of the spherical crown surface 221 in the axial direction of the shaft portion 210 is equal to or greater than the radius of the sphere on which the spherical crown surface 221 is located, in other words, the surface area of ​​the 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 part 220 further has 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 shaft part 210, and the position limiting surface 223 is perpendicular to the axis of the shaft part 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 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] It should be noted that the sliding part 220 is not limited to the above structure. In some embodiments, the entire sliding part 220 may be a spherical structure, in which the spherical crown surface 221 is the surface of the part of the sliding part 220 that is separated from the shaft part 210, and in which the sliding part 220 does not have the position limiting surface 223 and 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 shaft part 210 and the sliding part 220 are integrally molded structures, and in some embodiments, the shaft part 210 and the sliding part 220 may be fixedly connected together by assembly, welding, adhesion, etc. In some embodiments, the sliding part 220 has a sliding body and a diamond coating provided on the surface of the sliding body, making the surface of the sliding part 220 smooth and having high wear resistance. 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 mounted in the groove 310, so that the first shaft sleeve 300 restricts the rotating shaft 200 from moving in a direction approaching the first shaft sleeve 300. The shaft portion 210 of the rotating shaft 200 is rotatably mounted through the second shaft sleeve 400, and the second shaft sleeve 400 restricts the movement range of the shaft portion 210 in the radial direction 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 provided rotatably penetrating 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 located in the shaft hole 410, thereby allowing the rotation of the shaft portion 210 and the passage of cleaning liquid. The shaft hole 410 has a constant length along the central axis of the shaft hole 410 (in other words, the shaft hole 410 has a constant length in the axial direction of the housing 100), thereby limiting the radial swing range of the shaft portion 210 and limiting 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 operates, the rotating shaft 200 yawing at a certain width occurs. Referring to FIG. 30, the yawing width is particularly large at one end of the rotating shaft 200 that is separated from the impeller 20 or one end of the rotating shaft 200 that is fitted into the first shaft sleeve 300. In the conventional rotating shaft 200, however, referring to FIG. 29 and FIG. 31, the spherical crown surface 221 slidably abuts against the groove wall of the concave groove 310, that is, the sliding part 220 oscillates in the concave groove 310 via the spherical crown surface 221, and the depth h of the concave 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 problem that the part of the rotating shaft 200 other than the spherical crown surface 221 contacts the groove mouth of the concave groove 310 and the rotating shaft 200 is locked, and improves the safety and reliability of the drive mechanism 10 and the blood pump 1. If the depth h of groove 310 is greater than the height of spherical crown surface 221 in the axial direction of shaft portion 210, when a part of shaft portion 210 is accommodated in groove 310 and rotating shaft 200 oscillates radially, there is a risk that rotating shaft 200 will be locked in groove 310 and will not be able to rotate, causing the pump to stop.

[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 sliding part 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, so that the sliding part 220 can slide in the groove 310 and has a certain radial swing space. If the difference 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 D, then 0.04 mm≦D≦0.06 mm. By limiting the range of D, the process difficulty of fitting the sliding part 210 into the groove 310 can be reduced, while the maximum swing angle of the rotating shaft 200 can be limited, and the stability of the operation of the drive mechanism 10 can be ensured.

[0081] Specifically, the diameter of the groove 310 gradually increases along the axis of the first shaft sleeve 300 toward the second shaft sleeve 400. In other words, the entire groove wall of the groove 310 is a substantially spherical wall 312, so that the spherical crown surface 221 of the sliding part 220 can slide more smoothly in 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 mouth of the groove 310 is located when the spherical wall 312 of the groove 310 is in a perfect 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 mouth 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 where the spherical wall 312 is located, that is, 0.6R≦h≦R. This range allows the groove 310 to have a radial position limiting effect, not only to prevent the sliding part 220 from sliding out of the groove 310, but also to make the diameter of the groove 310 gradually increase along the axis of the first shaft sleeve 300 in the direction approaching the second shaft sleeve 400, so that the sliding part 220 can be easily inserted 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 mouth of the groove 310 is rounded to form a first round chamfer 311 at the edge of the groove mouth of the groove 310, to prevent the sliding part 220 from being scratched and worn by the edge of the groove mouth having an angle. In the embodiment shown in Fig. 28, the first round 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 end face of the far end of the first shaft sleeve 300.

[0085] 26 and 27, in some embodiments, the first axial sleeve 300 further includes a cleaning fluid hole 320 through which the cleaning fluid flows, the cleaning fluid hole 320 is in fluid communication with the groove 310, and the hole diameter of the cleaning fluid hole 320 is smaller than the diameter of the sphere in which the spherical wall 312 is located. Specifically, an opening at one end of the cleaning fluid hole 320 is located on the end face 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 cleaning fluid hole 320 is in communication with the cleaning line in the catheter 40, and can be in fluid communication with the cleaning line, so that the cleaning fluid can flow into the groove 310 through the cleaning fluid hole 320. The hole diameter of the cleaning fluid hole 320 is smaller than the diameter of the sphere in which 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 passes through the center of the sphere where the spherical wall 312 is located, so that the cleaning liquid can better flow between the groove wall of the groove 310 and the sliding part 220, and play a lubricating role to reduce the friction coefficient between the sliding part 220 and the groove wall of the groove 310, or reduce the friction coefficient between the spherical crown surface 221 and the spherical wall 312, not only reducing the wear between the sliding part 220 and the first shaft sleeve 300, but also the cleaning liquid flowing into the groove 310 from the cleaning liquid hole 320 can play the role of 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 flows 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 in 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 aperture of the first opening 321 is 1 / 9 to 1 / 3 of the diameter of the spherical crown surface 221. If the aperture of the first opening 321 of the cleaning liquid hole 320 is too large, the contact surface between the sliding part 220 and the side wall of the groove 310 becomes small (the pressure received per unit area becomes large), and the 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 at the same time, will flow between the sliding part 220 and the groove wall of the groove 310 to perform a lubricating effect, and reduce the friction coefficient between the sliding part 220 and the groove wall of the groove 310. Therefore, it is not preferable that the amount of cleaning liquid flowing into the groove 310 is too small. In addition, the edge of the first opening 321 of the cleaning liquid hole 320 is provided with a second round chamfer to prevent the sliding part 220 from being scratched or worn. In the illustrated embodiment, the first opening 321 is located at the spherical wall 312. The cleaning liquid flows between the spherical wall 312 and the spherical crown surface 221 through the first opening 321 to perform a lubricating effect.

[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 is formed with 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 part 220 through the liquid inlet hole 814 and the cleaning liquid hole 320, and then flow 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 in the mounting chamber 811, and 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 is away from the second shaft sleeve 400.

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

[0091] 32, the number of branch channels 816 is two, and the two branch channels 816 are provided opposite to each other. Note that the number of branch channels 816 can be adjusted according to design needs, and for example, in some embodiments, the number of branch channels 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 the stopper member 500 is located between the first shaft sleeve 300 and the second shaft sleeve 400, and 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 shaft hole 410 of the second shaft sleeve 400, so that the cleaning liquid can flow into the shaft hole 410 of the second shaft sleeve 400 through the gap between the stopper member 500 and the second shaft sleeve 400, i.e., realize the fluid communication between the shaft hole 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 hole diameter of the shaft hole 410, the thrust ring 510 abuts against the second shaft sleeve 400, and the thrust ring 510 separates the second shaft sleeve 400 and the second rotor 620 by a certain distance. Compared with 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 of a plurality of sector rings arranged around the shaft portion 210 at equal intervals, or may be formed of a plurality of sector rings arranged discretely 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 guide groove 420, which communicates with the shaft hole 410 of the second shaft sleeve 400, and when the stopper member 500 abuts against the second shaft sleeve 400, a portion of the 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 shaft hole 410 of the second shaft sleeve 400 and the shaft portion 210, but the guide groove 420 that is not covered by the thrust ring 510 realizes fluid communication when the thrust ring 510 abuts against the second shaft sleeve 400, and can ensure 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 providing a lubricating effect on 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 on 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 a mounting hole 102 that is aligned with the first annular body 401, the mounting hole 102 being located at the far end of the housing 100, and a position limiting protrusion 103 is provided on the inner wall of the housing 100, the position limiting protrusion 103 surrounding the mounting hole 102, the first annular body 401 being mounted within the mounting 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 mounting of the second shaft sleeve 400 and contributing to stable mounting 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 with metal materials, ceramics have high processing precision, high biocompatibility and mechanical strength, and 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 provided on the surface of the shaft sleeve body, which makes the surface of the first shaft sleeve 300 and the second shaft sleeve 400 smooth and improves the wear resistance. In this case, the material of the shaft sleeve body may be a material with a certain rigidity, such as metal, ceramic, etc.

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

[0099] 25, 26 and 34, the drive mechanism 10 further includes a first rotor 610, which is fixedly connected to the rotating shaft 200, and is located between the first shaft sleeve 300 and the second shaft sleeve 400, and there is a gap between the first rotor 610 and the first shaft sleeve 300, thereby avoiding 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 the position limiting surface 223 of the sliding part 220. The position limiting surface 223 can increase the connection area between the first rotor 610 and the rotating shaft 200 and improve 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 moves 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 gluing, welding, or the like. The cylindrical surface 222 having a certain length can increase the gap distance between the first rotor 610 and the first shaft sleeve 300, and prevents the first rotor 610 from abutting against the first shaft sleeve 300 when the rotating shaft 200 swings, thereby preventing the rotating shaft 200 from sticking.

[0100] The first rotor 610 includes a first flywheel 611 and a first magnet 612, and 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] In some embodiments, referring to FIG. 25 and FIG. 26, the drive mechanism 10 further includes a stator 700. The stator 700 and the first rotor 610 are provided 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 providing the first rotor 610 and the stator 700 along the axis of the shaft portion 210, the diameter of the entire 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 provided to rotatably pass 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 portion 210, and the second rotor 620 is located between the first shaft sleeve 300 and the second shaft sleeve 400. In the illustrated embodiment, the stopper member 500 is located between the second rotor 620 and the second shaft sleeve 400. Since the stopper member 500 is fixedly connected to at least one of the second rotor 620 and the shaft portion 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, may be directly fixed only to the shaft portion 210, or may be directly fixed to both the second rotor 620 and the shaft portion 210 at the same time.

[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 that of the first flywheel 611, and the 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 away from the first rotor 610. The thrust ring 510 and the second flywheel 621 are of a one-piece molded structure, which is integrally formed and easy to install, 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 in this case, the thrust ring 510 may be fixed to at least one of the second rotor 620 or the shaft portion 210 by bonding or welding.

[0105] In some embodiments, referring to FIG. 25, FIG. 26 and FIG. 36, the 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 head (i.e., a pole piece) with a large width. Compared with the magnetic core 710 provided with a pole piece, the magnetic core 710 with a columnar structure can reduce magnetic loss and increase 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 condition). In addition, the magnetic core 710 without a head can significantly reduce the problem of local magnetic short circuit and reduction in motor power caused by 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 axial line of the shaft portion 210.

[0106] The first rotor 610, the stator 700, and the second rotor 620 are sequentially arranged 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 both the first stator unit 701 and the second stator unit 702 include the above-mentioned magnetic core 710 and the above-mentioned 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. Both the first stator unit 701 and the second stator unit 702 are fixedly accommodated in the chamber 101 of the housing 100. The shaft portion 210 is rotatably provided 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 driving mechanism 10 further includes a magnetically permeable member 820 fixedly connected to the housing 100, and the magnetic core 710 of the first stator unit 701 and the magnetic core 710 of the second stator unit 702 are both fixedly connected to the magnetically permeable member 820. The shaft portion 210 is provided to rotatably penetrate the magnetically permeable member 820. The magnetically permeable member 820 plays a role in closing the magnetic path, promoting and increasing the generation of magnetic flux, and improving the coupling ability. Therefore, providing the magnetically permeable member 820 plays a role in closing 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, and can increase the magnetic flux. Therefore, providing the magnetically permeable member 820 is advantageous in reducing the overall diameter of the driving mechanism 10. In addition, in order to realize the positioning and mounting of the first stator unit 701 and the second stator unit 702, the magnetic permeable member 820 and the housing 100 may be directly and fixedly connected to each other, 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 which is fixedly connected to the magnetic core 710 of the first stator unit 701, and the other of which is fixedly connected to the magnetic core 710 of the second stator unit 702.

[0108] Since the drive mechanism of this embodiment has the same structure as the drive mechanism of the first embodiment, 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 merely 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 replacements for some of the technical features thereof, and such modifications and replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and all of them should be included in 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 rotating shaft; a first shaft sleeve and a second shaft sleeve, both of which 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, and the rotor is a first shaft sleeve and a second shaft sleeve located between the first shaft sleeve and the second shaft sleeve; a stopper member fixedly connected to at least one of the rotating shaft and the rotor, positioned between the rotor and the second shaft sleeve, and capable of abutting the second shaft sleeve.

2. The groove has a groove opening, the rotation shaft is provided to penetrate the groove opening, and the groove opening of the groove is rounded and chamfered. And / or, the length of the ball head end in the axial direction of the rotation shaft is smaller than the depth of the groove.

3. The first shaft sleeve further includes a liquid passage hole communicating with the groove, and an opening of the liquid passage hole is located in the spherical wall.

2. The drive mechanism of claim 1, wherein the opening is located at a central position of the spherical wall, and / or the aperture of the opening is 1 / 9 to 1 / 3 of the diameter of the sphere in which the ball head end is located.

4. 2. The drive mechanism according to claim 1, wherein the first shaft sleeve further includes 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 fluidly connected to the fluid inlet hole.

5. 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 to separate the first shaft sleeve from the chamber bottom by a certain distance, and / or the support seat is further formed with a branch passage, the branch passage being connected to the liquid inlet hole, thereby allowing fluid flowing into the liquid inlet hole to flow into the housing via the branch passage.

6. 2. The drive mechanism according to claim 1, characterized in that the second shaft sleeve has a shaft hole and a locking surface perpendicular to a 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.

7. At least one of the stopper surface and the engagement surface has a roughness of 0.1 micrometers or less; Alternatively, at least one of the stopper surface and the engagement surface is a ceramic surface, 7. The drive mechanism according to claim 6, wherein the material of the stopper surface is diamond.

8. 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; The drive mechanism according to claim 1, characterized in that when the stopper member abuts against the second shaft sleeve, at least a portion of the stopper member is located in 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.

9. 9. The drive mechanism according to claim 8, wherein a shaft hole is formed in the second shaft sleeve, the rotating shaft is rotatably inserted through the shaft hole, a gap is provided between the rotating shaft and a hole wall of the shaft hole through which a fluid flows, 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.

10. the rotor includes a first rotor and a second rotor provided along an axis of the rotating shaft, the first rotor and the second rotor are both fixedly connected to the rotating 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 rotation of the rotor, 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 capable of driving the rotation of the first rotor, the second stator unit capable of driving the rotation of the second rotor, 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 assembly, the magnetic core of the first stator unit and the magnetic core of the second stator unit both being fixedly connected to the magnetically permeable member, and the rotating shaft being rotatably disposed to pass through the first stator unit, the second stator unit and the magnetically permeable member.

11. The rotating shaft includes a shaft portion and a sliding portion provided at one end of the shaft portion, the shaft portion is rotatably inserted through the second shaft sleeve, the one end of the shaft portion away from the sliding portion is the connection end, the sliding portion is the ball head end, and the sliding portion has a spherical crown surface, 2. The drive mechanism according to claim 1, wherein a depth of the 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 groove, the spherical crown surface is in slidable contact with a spherical wall of the groove, and the stopper member is fixedly connected to the shaft portion.

12. 12. The drive mechanism according to claim 11, wherein the spherical crown surface is in slidable contact with the spherical wall, a radius of a sphere on which the spherical wall is located is larger than a radius of a sphere on which the spherical crown surface is located, and a diameter of the groove gradually increases along an axis of the first shaft sleeve in a direction approaching the second shaft sleeve.

13. The depth of the 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, an edge of the groove opening is rounded, and the sliding portion is provided so as to penetrate the groove opening of the groove.

14. The spherical crown surface is in slidable contact with the spherical wall, and the difference between the radius of the sphere on which the spherical wall is located and the radius of the sphere on which the spherical crown surface is located is defined as D, and 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.

15. 12. The drive mechanism of claim 11, 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 material of the stopper member and the second shaft sleeve is ceramic.

16. 16. The drive mechanism according to claim 15, wherein the sliding portion further has 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.

17. 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 rotating shaft; a first shaft sleeve and a second shaft sleeve, both of which 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, and the rotor is a first shaft sleeve and a second shaft sleeve located between the first shaft sleeve and the second shaft sleeve; a stopper member fixedly connected to at least one of the rotating shaft and the rotor, positioned between the rotor and the second shaft sleeve, and capable of abutting against the second shaft sleeve; The blood pump, characterized in that the impeller is connected to the connection end of the rotating shaft and can rotate according to the rotating shaft.

18. 18. The blood pump of claim 17, further comprising a cannula assembly connected to the drive mechanism, the cannula assembly including an insertion tube, a connecting tube fitted into the insertion tube, and an outlet tube fitted into 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 connection portion and an outlet portion away from the connecting tube, an outer wall of the connection portion being connected to an inner wall of one end of the connecting tube away from the insertion tube, and the impeller being rotatably mounted on the outlet tube.

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

20. 20. The drive mechanism of claim 19, wherein the first end face protrudes radially from the inner wall of the connecting tube more than the second end face, and an edge of the first end face and an edge of the second end face are connected via a transition surface, the edge of the first end face is flush with the inner wall of the insertion tube, and the edge of the second end face 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, or a sloped surface.

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