Drive mechanism and blood pump

Abstract

A drive mechanism (10) and a blood pump (1), wherein the drive mechanism (10) includes a housing assembly, a rotating assembly, and a sphere (900), wherein the rotating assembly includes a distal end rotatably attached to the housing assembly and a proximal end having a first groove portion (4124) having a concave first spherical wall (4124a) formed therein, wherein the housing assembly has a second groove portion (512) positioned opposite the first groove portion (4124) and having a concave second spherical wall (514), and the sphere (900) is partially located within the first groove portion (4124) and partially located within the second groove portion (512) and can slidably abut against the first spherical wall (4124a) and the second spherical wall (514), respectively.

Description

[Technical Field]

[0001] (CROSS-REFERENCE TO RELATED APPLICATIONS) This application claims priority from a Chinese patent application bearing application number 202211072218.9, filed with the State Intellectual Property Office of China on September 2, 2022, the entire contents of which are incorporated herein by reference.

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

[0003] Blood pumps are designed to be percutaneously inserted into a patient's blood vessels, such as an artery or vein in the thigh or armpit, and can be advanced to the patient's heart to function as a left ventricular assist device or a right ventricular assist device. Thus, blood pumps are also called intracardiac or intravascular blood pumps.

[0004] Generally, a blood pump has a drive mechanism and an impeller, and the impeller is connected to a rotating assembly of the drive mechanism. In order to achieve stable rotation of the rotating assembly, it is necessary to provide a mechanism for positioning or limiting the position of the rotating assembly, which makes the structure of the drive mechanism complicated. Summary of the Invention

[0005] In view of the above, the present application provides a drive mechanism and a blood pump having a simple structure.

[0006] An embodiment of a first aspect of the present application provides a drive mechanism, the drive mechanism comprising: a housing assembly; a rotating assembly including a distal end rotatably mounted to the housing assembly and a proximal end defining a first groove having a first concave spherical wall, the second groove being defined in the housing assembly opposite the first groove and having a second concave spherical wall; a sphere, a portion of which is provided within the first groove portion and a portion of which is provided within the second groove portion, and which slidably abuts against the first spherical wall and the second spherical wall, respectively.

[0007] An embodiment of a second aspect of the present application provides a blood pump including an impeller and a drive mechanism, the drive mechanism comprising: a housing assembly; a rotating assembly including a distal end rotatably mounted to the housing assembly and a proximal end defining a first groove having a first concave spherical wall, the second groove being defined in the housing assembly opposite the first groove and having a second concave spherical wall; a sphere that is partially provided within the first groove portion and partially provided within the second groove portion and that slidably abuts against the first spherical wall and the second spherical wall, respectively; The impeller is coupled to the rotating assembly so that the impeller can rotate following the rotating assembly.

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

[0009] In order to more clearly explain the technical solutions in the embodiments of the present application, the accompanying drawings used in the description of the embodiments or prior art will be briefly introduced below. However, the accompanying drawings in the following description are only a part of the embodiments of the present application, and it will be obvious to those skilled in the art that they can derive other drawings from these drawings without paying any creative effort. [Figure 1] 1 is a schematic diagram of a blood pump provided in an embodiment of the present invention; [Figure 2] 2 is a cross-sectional view of the blood pump shown in FIG. 1, with the impeller, stator, tubing, and some of the conduits omitted. [Figure 3]2 is a cross-sectional view of the blood pump of FIG. 1 assembled with the rotating shaft, stopper, rotor, shaft sleeve, sphere, and support member. [Figure 4] FIG. 3 is a local enlarged view of part I shown in FIG. 2. [Figure 5] 2 is a schematic diagram of the blood pump shown in FIG. 1 in which a rotor, a stator, and a magnetically permeable member are assembled. FIG. [Figure 6] FIG. 3 is a schematic configuration diagram of a first flywheel of a first rotor unit of the rotor shown in FIG. 2. [Figure 7] 7 is a schematic diagram illustrating the configuration in which the second stator unit shown in FIG. 6 and one magnetic permeable plate of the magnetic permeable member are assembled together. FIG. [Figure 8] FIG. 3 is a schematic diagram illustrating the configuration of a support member of the blood pump shown in FIG. 2. [Figure 9] FIG. 9 is a schematic diagram illustrating the cross-sectional structure of the support member shown in FIG. 8. [Figure 10] FIG. 3 is a schematic diagram of the first flywheel of FIG. 2. [Figure 11] FIG. 3 is a schematic diagram illustrating the configuration of a stopper of the blood pump shown in FIG. 2. [Figure 12] 2 is a cross-sectional view of the blood pump shown in FIG. 1 from another perspective, with some of the conduits omitted. [Figure 13] FIG. 13 is a locally enlarged view of part II in FIG. [Figure 14] FIG. 13 is a schematic diagram illustrating the configuration of a support seat of the blood pump shown in FIG. [Figure 15] FIG. 3 is an enlarged view of a local portion of the blood pump shown in FIG. 2. [Figure 16] FIG. 3 is a partially enlarged view of a shaft sleeve of the blood pump shown in FIG. 2. DETAILED DESCRIPTION OF THE INVENTION

[0010] In order to make the purpose, technical form and advantages of the present application clearer, the present application will be described in more detail below with reference to the drawings, i.e., examples. It should be understood that the specific examples described in this specification are only used to explain the present application and are not intended to limit the present application.

[0011] It should be noted that when an element is referred to as being "fixed" or "mounted" to another element, it may be directly mounted to the other element or indirectly mounted to the other element. When an element is referred to as being "coupled" to another element, it may be directly coupled to the other element or indirectly coupled to the other element.

[0012] Additionally, the terms "first" and "second" are merely for descriptive purposes and should not be understood as expressing or suggesting relative importance, but rather as implicitly indicating the number of technical features described. Thus, a feature described with "first" or "second" can expressly or implicitly mean that it includes one or more of the feature. In the description of this application, "plurality" means two or more than two, unless otherwise specified.

[0013] In order to explain the technical aspects of the present application, the following description will be given with reference to specific drawings and examples.

[0014] In the field of interventional medicine, the side of the instrument closest to the operator is defined as the proximal end, and the side away from the operator is defined as the distal end.

[0015] The drive mechanism 10 and the blood pump 1 according to the embodiment of the present invention will be described below.

[0016] 1, the blood pump 1 includes a drive mechanism 10 and an impeller 20. The drive mechanism 10 is rotatably connected to the impeller 20 and can drive the impeller 20 to rotate.

[0017] Specifically, the blood pump 1 further includes a tube 40 fixed to the distal end of the drive mechanism 10. The impeller 20 is rotatably housed within the tube 40. The tube 40 has a blood outlet 42 and a blood inlet 41. As the impeller 20 rotates, blood flows into the tube 40 through the blood inlet 41 and flows out through the blood outlet 42. In one embodiment, the tube 40 extends through a heart valve, such as the aortic valve, such that the blood inlet 41 is located within the heart and the blood outlet 42 and the drive mechanism 10 are located outside the heart, for example, in a blood vessel such as the aorta.

[0018] Specifically, blood pump 1 further includes a conduit 50 connected to the proximal end of drive mechanism 10. Here, conduit 50 is used to house various supply lines. For example, the supply lines include electrical leads electrically connected to drive mechanism 10 and a flushing line for delivering a flushing fluid to blood pump 1. Optional flushing fluids include saline, heparinized saline, or glucose.

[0019] 2 to 7, the drive mechanism 10 includes a pump case 100, a rotating shaft 200, a rotor 400, a support member 510, a shaft sleeve 520, and a sphere 900. The pump case 100, the shaft sleeve 520, and the support member 510 constitute a housing assembly. The rotating shaft 200 and the rotor 400 constitute a rotating assembly. The rotating assembly is rotatably attached to the housing assembly and is connected to the impeller 20 to rotate the impeller 20. The rotating assembly has a distal end and a proximal end, and the distal end is rotatably attached to the housing assembly. Here, a first groove 4124 having a concave first spherical wall 4124a is formed in the proximal end of the rotating assembly. A second groove 512 having a concave second spherical wall 514 and positioned opposite the first groove 4124 is formed in the housing assembly. A portion of the sphere 900 is placed in the first groove 4124 and slidably abuts the first spherical wall 4124a, and a portion is placed in the second groove 512 and slidably abuts the second spherical wall 514, thereby positioning and supporting the sphere 900. The sphere 900, the first groove 4124, and the second groove 512 cooperate to support and position the proximal end of the rotating assembly. Furthermore, the radial rolling path of the sphere 900 is limited within the first groove 4124 and the second groove 512, thereby limiting the radial swing range of the rotating assembly. Finally, because the sphere 900, the rotating assembly, and the housing assembly are independent of one another, during assembly, as long as the rotation axis of the rotating assembly is aligned with the central axis of the cavity surrounded by the first spherical wall 4124a, it is possible to ensure that the central axis of the sphere 900 is aligned with the rotation axis of the rotating assembly simply by placing the sphere 900 in the first groove portion 4124.Then, it is only necessary to fit the sphere 900 into the housing assembly and have the second groove portion 512 play the role of supporting and positioning the sphere 900; there is no need to align the central axis of the cavity surrounded by the second spherical wall 514 with the central axis of the sphere 900, thereby reducing the difficulty of assembly.

[0020] The pump case 100 has a generally cylindrical structure that is open at both ends. The distal end of the pump case 100 is fixed to the tube 40, and the proximal end is fixed to the conduit 50. The pump case 100 has an internal cavity. Specifically, the internal cavity is divided into a positioning cavity 112 and a storage cavity 114. In the illustrated embodiment, the positioning cavity 112 and the storage cavity 114 are disposed along the axial direction of the pump case 100.

[0021] The rotating shaft 200 is rotatably mounted on the pump case 100 and has a connecting end 210 for connecting to the impeller 20. In the illustrated embodiment, the rotating shaft 200 extends generally along the axial direction of the pump case 100; in other words, the direction in which the axis of the rotating shaft 200 extends is substantially the same as the axial direction of the pump case 100. The positioning cavity 112 and the storage cavity 114 are arranged along the axis of the rotating shaft 200. The rotating shaft 200 passes through the positioning cavity 112, with a portion of the rotating shaft 200 housed in the storage cavity 114 and a portion located outside the pump case 100; in other words, a portion of the rotating shaft 200 extending into the tube 10. The portion of the rotating shaft 200 extending outside the pump case 100 or into the tube 10 is the connecting end 210 of the rotating shaft 200. Specifically, the impeller 20 is fixed to the connecting end 210 so that it can rotate following the rotation of the rotating shaft 200.

[0022] The rotor 400 is located within the pump case 100, i.e., the rotor 400 is also located in the internal cavity of the pump case 100. In the illustrated embodiment, the rotor 400 is located within the storage cavity 114. The rotor 400 is fixed to the rotating shaft 200. Here, the first groove portion 4124 is located in one of the rotating shaft 200 and the rotor 400.

[0023] The drive mechanism 10 further includes a stator 300 capable of rotationally driving the rotating assembly. Specifically, the stator 300 can rotationally drive the rotor 400, and the rotor 400 can be coupled to rotate the rotating shaft 200. More specifically, the rotor 400 is magnetic, and the stator 300 can generate a rotating magnetic field that rotates the rotor 400. The stator 300 is fixedly attached to the pump case 100, i.e., installed within the internal cavity of the pump case 100. In the illustrated embodiment, the stator 300 is located within the storage cavity 114. Here, the rotating shaft 200 rotatably passes through the stator 300.

[0024] 5, in the illustrated embodiment, the rotor 400 includes a first rotor unit 410 and a second rotor unit 420, both of which are fixed to the rotary shaft 200. Both the first rotor unit 410 and the second rotor unit 420 are rotatably housed within the storage cavity 114 of the pump case 100. The first rotor unit 410 The first rotor unit 410 and the second rotor unit 420 are installed along the axis of the rotating shaft 200. Here, the stator 300 is located between the first rotor unit 410 and the second rotor unit 420. Both the first rotor unit 410 and the second rotor unit 420 are magnetic, and the stator 300 can generate a rotating magnetic field that drives the first rotor unit 410 and the second rotor unit 420 to rotate.

[0025] Specifically, the first rotor unit 410 includes a first magnetic body 411 fixed to the rotary shaft 200. Here, the first magnetic body 411 is an annular Halbach array magnet.

[0026] Specifically, the first rotor unit 410 includes a first flywheel 412 fixed to the rotating shaft 200, and a first magnetic body 411 is fixed to the first flywheel 412. The installation of the first flywheel 412 can strengthen the connection strength between the first magnetic body 411 and the rotating shaft 200, and can also reduce shaking of the rotating shaft 200 during rotation, making the entire rotating shaft 200 more stable during rotation. In the illustrated embodiment, the first groove portion 4124 is located in the first rotor unit 410, specifically, in the first flywheel 412.

[0027] 6, specifically, the first flywheel 412 includes a first internal pipe 4121, a first disk-shaped portion 4122, and a first outer ring wall 4123, both of which have a circular pipe structure, and the first disk-shaped portion 4122 has an annular disk structure. The first internal pipe 4121 and the first outer ring wall 4123 are both fixed to the first disk-shaped portion 4122. The first outer ring wall 4123 is installed so as to surround the first disk-shaped portion 4122, and both of the first internal pipe 4121 and the first outer ring wall 4123 are installed coaxially, and the rotating shaft 200 is inserted into the first internal pipe 4121 and fixedly connected to the first internal pipe 4121. A first annular cavity 4124 is formed between the first internal tube 4121 and the first outer ring wall 4123. The first magnetic body 411 is housed in the first annular cavity 4124. The shape of the first annular cavity 4124 is compatible with the first magnetic body 411, facilitating the installation and positioning of the first magnetic body 411. By installing it in this manner, the first flywheel 412 can serve to position the first magnetic body 411, not only facilitating the installation of the first magnetic body 411 but also ensuring a more reliable connection between the first magnetic body 411 and the first flywheel 412.

[0028] 10, the first groove 4124 is located at the center of the first disc-shaped portion 4122, and the first internal tube 4121 is also located at the center of the first disc-shaped portion 4122; in other words, the central axis of the first groove 4124 and the central axis of the first internal tube 4121 coincide with each other. In this embodiment, the proximal end of the rotating shaft 200 is housed in the first internal tube 4121 and fixedly connected to the first internal tube 4121, but does not protrude from the first disc-shaped portion 4122, thus facilitating the assembly and positioning of the rotating shaft 200 and the first rotor unit 410. The central axis of the rotating shaft 200 coincides with the central axis of the first internal tube 4121.

[0029] Note that the first flywheel 412 is not limited to the above-described configuration, and in some embodiments, the first flywheel 412 does not have the first outer ring wall 4123. In some embodiments, the first flywheel 412 does not have the first outer ring wall 4123 or the first built-in tube 4121. In this case, the rotating shaft 200 may be fixedly inserted through the center of the first disc-shaped portion 4122, and the first groove portion 4124 may be located at the end of the proximal end of the rotating shaft 200. Compared to the first flywheel 412 having only the first disc-shaped portion 4122, the connection between the first flywheel 412 and the rotating shaft 200 can be more stable when the first built-in tube 4121 is installed.

[0030] The second rotor unit 420 includes a second magnetic body 421 fixed to the rotary shaft 200. Specifically, the second magnetic body 421 is an annular Halbach array magnet.

[0031] Specifically, the second rotor unit 420 includes a second flywheel 422 fixed to the rotating shaft 200, and the second magnetic body 421 is fixed to the second flywheel 422. The installation of the second flywheel 422 can strengthen the connection strength between the second magnetic body 421 and the rotating shaft 200, and also reduce shaking of the rotating shaft 200 during rotation, making the entire rotating shaft 200 more stable during rotation.

[0032] 3, the second flywheel 422 includes a second internal pipe 4221, a second disk-shaped portion 4222, and a second outer ring wall 4223. Both the second internal pipe 4221 and the second outer ring wall 4223 have a circular pipe structure, and the second disk-shaped portion 4222 has an annular disk structure. The second internal pipe 4221 and the second outer ring wall 4223 are both fixed to the second disk-shaped portion 4222. The second outer ring wall 4223 is installed to surround the second disk-shaped portion 4222, and the second internal pipe 4221 and the second outer ring wall 4223 are installed coaxially. The rotating shaft 200 passes through the second internal pipe 4221 and is fixedly connected to the second internal pipe 4221. A second annular cavity is formed between the second internal pipe 4221 and the second outer ring wall 4223. The second magnetic body 421 is housed in the second annular cavity. The shape of the second annular cavity is compatible with the second magnetic body 421, facilitating the installation and positioning of the second magnetic body 421. By installing it in this manner, the second flywheel 422 can serve to position the second magnetic body 421, not only facilitating the installation of the second magnetic body 421 but also ensuring a more reliable connection between the second magnetic body 421 and the second flywheel 422.

[0033] The second flywheel 422 is not limited to the above-described configuration, and in some embodiments, the second flywheel 422 does not have the second outer ring wall 4223, but in some embodiments, the second flywheel 422 does not have the second outer ring wall 4223 or the second built-in pipe 4221, and in this case, the rotating shaft 200 fixedly passes through the center of the second disk-shaped portion 4222. Compared to the case of a second flywheel 422 having only the second disk-shaped portion 4222, when the second built-in pipe 4221 is installed, the connection between the second flywheel 422 and the rotating shaft 200 can be made more stable.

[0034] Specifically, the stator 300 includes a first stator unit 310 and a second stator unit 320 arranged along the axis of the rotating shaft 200. The first stator unit 310 can rotate the first rotor unit 410, and the second stator unit 320 can rotate the second rotor unit 420. Specifically, the first stator unit 310 can generate a rotating magnetic field that rotates the first rotor unit 410, and the second stator unit 320 can generate a rotating magnetic field that rotates the second rotor unit 420. Both the first stator unit 310 and the second stator unit 320 are fixedly housed in the storage cavity 114 of the pump case 100. The rotating shaft 200 rotatably passes through the first stator unit 310 and the second stator unit 320. Here, the first stator unit 310 and the second stator unit 320 are both located between the first rotor unit 410 and the second rotor unit 420 .

[0035] Here, both the first stator unit 310 and the second stator unit 320 include a magnetic core and a coil wound around the magnetic core. Specifically, the first stator unit 310 includes a first magnetic core 312 and a first coil 313 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 arranged in a circle around the axis of the rotating shaft 200. One first coil 313 is provided for each first magnetic core 312.

[0036] The configuration of second stator unit 320 is similar to the configuration of first stator unit 310. Referring also to Fig. 8, second stator unit 320 includes second magnetic core 322 and second coil 323 wound around second magnetic core 322. There are multiple second magnetic cores 322, and the multiple second magnetic cores 322 are arranged in a circle around the axis of rotating shaft 200. One second coil 323 is provided for each second magnetic core 322.

[0037] Specifically, the drive mechanism 10 further includes a magnetically permeable member 700 connected to the pump case 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 fixed to the magnetically permeable member 700. Specifically, the magnetically permeable member 700 is fixedly housed within the pump case 100, for example, by being fastened, welded, or glued to the inner wall of the pump case 100. The rotating shaft 200 rotatably passes through the magnetically permeable member 700. One end of the first magnetic core 312 is fixed to the magnetically permeable member 700, and the other end is adjacent to the first rotor unit 410. The second magnetic core 322 One end of the rotor unit 420 is fixed to the magnetically permeable member 700, and the other end of the rotor unit 420 is installed adjacent to the rotor unit 420.

[0038] The magnetic permeable member 700 closes the magnetic path, promotes and increases the generation of magnetic flux, and improves coupling capability. Therefore, the installation of the magnetic permeable member 700 closes the magnetic path between the first stator unit 310 and the first rotor unit 410 and between the second stator unit 320 and the second rotor unit 420, thereby increasing the magnetic flux. Therefore, the installation of the magnetic permeable member 700 contributes to reducing the diameter of the entire drive mechanism 10. Furthermore, by fixing 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 installation of the first stator unit 310 and the second stator unit 320 can be achieved, and the difficulty of assembling the first stator unit 310 and the second stator unit 320 can be reduced. Furthermore, the magnetically permeable member 700 installed as described above reduces the positioning configuration installed inside the pump case 100, thereby simplifying the configuration of the pump case 100 and simplifying the assembly of the drive mechanism 10.

[0039] Specifically, the magnetic permeable member 700 includes two stacked magnetic permeable plates 710, one of which is fixed to the first magnetic core 312 of the first stator unit 310 and the other of which is fixed to the second magnetic core 322 of the second stator unit 320, and the rotating shaft 200 rotatably passes through the two magnetic permeable plates 710. Specifically, the two magnetic permeable plates 710 are separate before assembly, and by making the magnetic permeable member 700 into two magnetic permeable plates 710 that are separate before assembly, when assembling the drive mechanism 10, first the first magnetic core 312 is fixed to one of the magnetic permeable plates 710, and the second magnetic core 322 is fixed to the other magnetic permeable plate 710, and then the two magnetic permeable plates 710 are stacked, thereby making it easy to assemble the first magnetic core 312 and the second magnetic core 322 into two magnetic permeable plates 710 each, and facilitating the assembly of the first magnetic core 321 and the second magnetic core 322.

[0040] Specifically, by fixing the two magnetic permeable plates 710, the first stator unit 310, the second stator unit 320, and the magnetic permeable member 700 are assembled together in the pump case 100, making it easier to assemble the stator 300. For example, the two magnetic permeable plates 710 may be joined together by adhesive or welding. In another embodiment, the two magnetic permeable plates 710 contact each other instead of being fixed.

[0041] The magnetically permeable member 700 is not limited to the above-described method of combining two separate magnetically permeable plates 710, and the magnetically permeable member 700 may have a plate-like structure. 312 and the second magnetic core 322 are connected to the magnetic permeability member 700 , that is, the first stator unit 310 and the second stator unit 320 may be configured to share one magnetic permeability member 700 .

[0042] 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.

[0043] The sphere 900 is movably housed in the pump case 100. Specifically, the sphere 900 is located within the storage cavity 114.

[0044] 2, 3, and 4, the support member 510 and the shaft sleeve 520 are both mounted in the pump case 100. Specifically, the support member 510 is housed in the storage cavity 114, and the shaft sleeve 520 is housed in the positioning cavity 112. Both the support member 510 and the shaft sleeve 520 are fixed to the pump case 100. The support member 510, the shaft sleeve 520, and the sphere 900 are arranged along the axial direction of the pump case 100, and the support member 510, the shaft sleeve 520, and the sphere 900 can jointly position the rotating assembly. The shaft sleeve 520 is closer to the connecting end 210 of the rotating shaft 200 than the support member 510. The rotor 400 is located between the sphere 900 and the shaft sleeve 520, and the stator 300 is also located between the sphere 900 and the shaft sleeve 520. In the illustrated embodiment, the first rotor unit 410, the second rotor unit 420, the first stator unit 310, and the second stator unit 320 are all located between the sphere 900 and the shaft sleeve 520. The sphere 900 is located between the first rotor unit 410 and the support member 510. The first rotor unit 410 is installed adjacent to the sphere 900, and the second rotor unit 420 is installed adjacent to the shaft sleeve 520. In other words, the support member 510, the sphere 900, the first rotor unit 410, the first stator unit 310, the second stator unit 320, the second rotor unit 420, and the shaft sleeve 520 are installed in order along the axis of the rotating shaft 200, with the shaft sleeve 520 being closest to the connecting end 210 of the rotating shaft 200. A second groove 512 is opened in the support member 510.

[0045] 8, 9, and 10 , specifically, a rounding 515 is provided on the opening edge of the first groove 4124 on the side closer to the second groove 512, and on the opening edge of the second groove 512 on the side closer to the first groove 4124. During rotation of the rotating shaft 200, the first rotor unit 410 away from the connecting end 210 undergoes slight yaw in the radial direction, and therefore the sphere 900 rolls radially within the first groove 4124 and the second groove 512. In other words, by providing the rounding 515, the sphere 900 is prevented from being scratched and worn by the angular opening edges of the first groove 4124 and the second groove 512.

[0046] Specifically, the diameter of the sphere 900 is greater than the sum of the lengths of the first groove 4124 and the second groove 512 along the rotation axis of the rotating assembly (when the rotating assembly is not swinging radially). This allows the proximal end of the rotating assembly to be spaced apart from the housing assembly (e.g., the support member 510) by a certain distance, preventing the proximal end of the rotating assembly from interfering with the housing assembly when the rotating assembly swings radially. As shown in FIG. 4 , L1 is the length of the first groove 4124 along the rotation axis of the rotating assembly, and L2 is the length of the second groove 512 along the rotation axis of the rotating assembly (when the rotating assembly is not swinging radially). Specifically, L2 is the length of the second groove 512 along the axial direction of the pump case 100. A portion of the sphere 900 is located outside the first groove portion 4124 and the second groove portion 512, and the opening of the first groove portion 4124 closer to the second groove portion 512 and the opening of the second groove portion 512 closer to the first groove portion 4124 are spaced apart by a fixed distance. In other words, the rotor 400 (specifically, the first rotor unit 410) and the support member 510 are spaced apart by a fixed distance, thereby preventing direct friction and wear between the rotor 400 and the support member 510.

[0047] More specifically, the length L1 of the first groove portion 4124 along the rotation axis of the rotating assembly is equal to or greater than ¼ of the diameter of the sphere 900 and less than ½ of the diameter of the sphere 900. By keeping the contact area between the sphere 900 and the first groove portion 4124 within this range, it is ensured that the wear between the sphere 900 and the first spherical wall 4124a is within an appropriate range. If the distance is less than 1 / 4 of the diameter of the sphere 900, the contact area between the sphere 900 and the first spherical wall 4124a will be too small and the wear will be too great; however, if the distance is more than 1 / 2 of the diameter of the sphere 900, the sphere 900 will penetrate too deep into the first groove portion 4124, the radial positioning will be too tight, and the slope of the first spherical wall 4124a will be too steep, making it difficult for the sphere 900 to roll radially, reducing the ability to respond to yaw, preventing the rotating assembly from rotating smoothly and ultimately causing it to lock. Furthermore, in the illustrated embodiment, the first groove portion 4124 is opened on the surface of the first plate-shaped portion 4122 that is farther from the first magnetic body 411. Therefore, if the first groove portion 4124 is too deep, it will interfere with the mounting space of the first magnetic body 411, and the thickness of the first plate-shaped portion 4122 will need to be increased. This will increase the axial length of the entire rotating assembly and make the entire structure within the pump case 100 more congested.

[0048] Similarly, the length L2 of second groove portion 512 along the rotation axis of the rotating assembly (when the rotating assembly is not swinging radially) is equal to or greater than ¼ of the diameter of sphere 900 and less than ½ of the diameter of sphere 900. By keeping the contact area between sphere 900 and second groove portion 512 within this range, wear between sphere 900 and second spherical wall 514 is kept small. If the distance is less than 1 / 4 of the diameter of the sphere 900, the contact area between the sphere 900 and the second spherical wall 514 will be too small and the wear will be too great; however, if the distance is more than 1 / 2 of the diameter of the sphere 900, the sphere 900 will enter the second groove portion 512 too deeply, the radial positioning will be too tight, and the slope of the second spherical wall 514 will be too steep, making it difficult for the sphere 900 to roll radially, reducing the ability to respond to yaw, preventing the rotation of the rotating assembly from being smooth, and ultimately causing it to lock.

[0049] Specifically, the diameter of the sphere where first spherical wall 4124a is located is larger than the diameter of sphere 900. Because slight yaw occurs in the radial direction during rotation of the rotating assembly, sphere 900 is engaged to roll along first spherical wall 4124a. Because the diameter of the sphere where first spherical wall 4124a is located is larger than the diameter of sphere 900, i.e., the distance between first spherical wall 4124a and the outer wall of sphere 900 gradually increases in the radial direction, sphere 900 is not completely enclosed in the radial direction. In other words, sphere 900 has a rolling space within first groove portion 4124 to accommodate yaw of rotating shaft 200, and is not locked. Similarly, the diameter of the sphere where second spherical wall 514 is located is larger than the diameter of sphere 900. Because the diameter of the sphere where the second spherical wall 514 is located is larger than the diameter of the sphere 900, i.e., because the distance between the second spherical wall 514 and the outer wall of the sphere 900 gradually increases along the radial direction, the sphere 900 is not completely enclosed in the radial direction, and the sphere 900 has a rolling space within the second groove portion 512 to accommodate the yaw of the rotating shaft 200, and is not locked.

[0050] Specifically, the second groove 512 has a first opening 512a and a second opening 516a. The support member 510 has a communication hole 516 communicating with the second groove 512, the communication hole 516 communicating with the second opening 516a. The communication hole 516 can communicate with a cleaning pipe in the conduit 50 so that the cleaning liquid can pass through the communication hole 516 into the second groove 512 and flow from the second groove 512 into the storage cavity 114. The entry of the cleaning liquid between the second spherical wall 514 of the second groove 512 and the sphere 900 serves the roles of lubrication and heat dissipation, reducing friction between the sphere 900 and the second spherical wall 514 of the second groove 512, dissipating generated heat, and reducing wear between the sphere 900 and the second spherical wall 514.

[0051] Specifically, first opening 512a is closer to first groove portion 4124 than second opening 516a, and second opening 516a is located at the center of second spherical wall 514, so that the cleaning liquid that has entered second groove portion 512 from communicating hole 516 provides as much axial impact force as possible to sphere 900. More specifically, the central axis of communicating hole 516 coincides with the central axis of the cavity surrounded by second spherical wall 514; that is, the central axis of first opening 512a coincides with the central axis of second opening 516a. Since communicating hole 516 is a linear hole, energy consumption of the cleaning liquid within communicating hole 516 is reduced.

[0052] Specifically, the diameter of second opening 516a is 1 / 9 to 1 / 3 of the diameter of sphere 900. In the illustrated embodiment, the diameter of communication hole 516 is constant, that is, the diameter of communication hole 516 is 1 / 9 to 1 / 3 of the diameter of sphere 900. If the diameter of opening 516a of communication hole 516 located in second spherical wall 514 is too large, the contact surface between sphere 900 and second spherical wall 514 will be small and wear of sphere 900 by second spherical wall 514 will increase, but if the diameter of opening 516a is too small, the amount of cleaning liquid that enters second groove portion 512 from communication hole 516 will be affected. The cleaning liquid that enters the second groove portion 512 provides an impact force to the sphere 900, but also enters between the sphere 900 and the second spherical wall 514, acts as a lubricant, and reduces the coefficient of friction between the sphere 900 and the second spherical wall 514, so the amount of cleaning liquid that enters the second groove portion 512 must not be too small.

[0053] 12, 13, and 14, the drive mechanism 10 further includes a support seat 800 fixed to the pump case 100. The support seat 800 is provided with a mounting cavity 810 and a fluid supply hole 820 communicating with the mounting cavity 810. The support member 510 is mounted in the mounting cavity 810. The communication hole 516 has a certain length along the central axis of the first opening 512a and communicates with the fluid supply hole 820. The side of the fluid supply hole 820 away from the mounting cavity 810 communicates with the cleaning pipe of the conduit 50. The cleaning liquid passes through the fluid supply hole 820 and the communication hole 516, flows through the second opening 516a, into the gap between the second spherical wall of the second groove 512 and the sphere 900, and then flows into the internal cavity of the pump case 100 through the first opening 512a.

[0054] Here, after the cleaning liquid flows out from the first opening 512a, it flows into the first groove portion 4124, and the cleaning liquid entering between the first spherical wall 4124a of the first groove portion 4124 and the sphere 900 serves to lubricate and dissipate heat, reducing friction between the sphere 900 and the first spherical wall 4124a of the first groove portion 4124, dissipating the generated heat, and reducing wear between the sphere 900 and the first spherical wall 4124a.

[0055] Specifically, the mounting cavity 810 has a cavity bottom 812, one opening of the liquid supply hole 820 is located at the cavity bottom 812 of the mounting cavity 810, and a support step 814 that abuts against the support member 510 is provided within the mounting cavity 810, thereby separating the support member 510 and the cavity bottom 812 by a certain distance and ensuring smooth flow of the cleaning liquid. Specifically, the support step 814 abuts against the surface of the support member 510 on the side away from the shaft sleeve 520.

[0056] Specifically, the support seat 800 further has a branch flow path 830, which is fluidly connected to the liquid supply hole 820, allowing the cleaning liquid that has passed through the liquid supply hole 820 to flow into the internal cavity of the pump case 100 via the branch flow path 830. 830One end of the branch flow channel 830 communicates with the gap between the support member 510 and the cavity bottom 812 of the mounting cavity 810, and the other end communicates with the storage cavity 114. In the illustrated embodiment, the branch flow channel 830 is formed by locally recessing the cavity wall of the mounting cavity 810. In other words, after the cleaning liquid enters the mounting cavity 810 from the liquid supply hole 820, it is generally divided into two, one of which flows into the second groove 512 of the support member 510 via the communication hole 516, and the other flows out via the branch flow channel 830. The provision of the branch flow channel 830 ensures the flow of the cleaning liquid even when the communication hole 516 is blocked by the sphere 900.

[0057] In the illustrated embodiment, the number of branch channels 830 is two, and the two branch channels 830 are installed opposite each other. The number of branch channels 830 may be adjusted according to design needs. For example, in some embodiments, the number of branch channels 830 may be one or more than two.

[0058] 2, 3, 11, 15, and 16, the shaft sleeve 520 is provided with a positioning step 120. In the illustrated embodiment, the positioning step 120 is formed by cutting the surface of the shaft sleeve 520 close to the impeller 20 along the central axis of the rotating shaft 200 to a certain depth. The positioning step 120 positions the shaft sleeve 520 when it is attached to the pump case 100, facilitating assembly of the shaft sleeve 520. The shaft sleeve 520 has a shaft hole 522, through which the rotating shaft 200 rotatably passes. In the illustrated embodiment, the central axis of the shaft hole 522 coincides with the central axis of the communication hole 516. A gap is provided between the wall of the shaft hole 522 of the shaft sleeve 520 and the rotating shaft 200, allowing fluid to flow through. Here, the cleaning liquid that has entered the storage cavity 114 can flow out into the pump case 100 via the gap between the rotating shaft 200 and the wall of the shaft hole 522 .

[0059] The stopper 600 is fixed to the rotating assembly, specifically, to at least one of the rotating shaft 200 and the rotor 400 (specifically, the second rotor unit 420). In other words, the stopper 600 may be directly fixed only to the rotor 400, only to the rotating shaft 200, or to both the rotor 400 and the rotating shaft 200. Because the rotor 400 is fixed to the rotating shaft 200, the stopper 600, the rotating shaft 200, and the rotor 400 rotate and move synchronously. The stopper 600 is located between the rotor 400 and the shaft sleeve 520, and the stopper 600 abuts against the shaft sleeve 520, thereby restricting the rotation of the rotating shaft 200 along its axis in a direction approaching the proximal impeller 20.

[0060] The stopper 600, the rotating shaft 200, and the rotor 400 rotate and move in synchronization, and the stopper 600 abuts against the shaft sleeve 520, thereby restricting movement of the rotating shaft 200 along the axis of the rotating shaft 200 in a direction toward the impeller 20. The side of the sphere 900 facing the rotor 400 abuts against the first spherical wall 4124a of the first groove portion 4124, and the side of the sphere 900 facing the support member 510 abuts against the second spherical wall 514 of the second groove portion 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, and realizing positioning of the rotating shaft 200 on the axis of the rotating shaft 200. Furthermore, because the rotating shaft 200 passes through the shaft sleeve 520 and the sphere 900 is simultaneously disposed between the first groove portion 4124 and the second groove portion 512, when the rotating shaft 200 swings radially, the sphere 900 is interlocked to roll within the first groove portion 4124 and the second groove portion 512, thereby limiting the rolling range of the sphere 900 in the radial direction of the rotating shaft 200 and generally limiting the swing range of the rotating shaft 200 in the radial direction. In other words, the above design achieves not only the axial positioning of the rotating shaft 200 but also the radial positioning of the rotating shaft 200.

[0061] Furthermore, by installing the sphere 900, the center of gravity of the sphere 900 becomes the sphere center, and during assembly, the rotation axis of the rotating assembly is simply aligned with the central axis of the cavity surrounded by the first spherical wall 4124a. That is, the rotation axis 200 is kept vertical, the opening of the first groove 4124 is oriented upward, and the sphere 900 is left freely within the first groove 4124 by gravity, thereby realizing the coaxiality of the sphere 900 and the rotation axis 200. The assembly is then completed by fitting the sphere 900 into the second groove 514 of the support member 510. The second groove 512 only serves to support and position the sphere 900, and the central axis of the cavity surrounded by the second spherical wall 514 of the support member 510 does not need to be aligned with the central axis of the sphere 900. This reduces the difficulty of assembly and makes the assembly process simple and quick.

[0062] In the illustrated embodiment, the stopper 600 is fixed to the second rotor unit 420, specifically, to the second flywheel 422 of the second rotor unit 420. In some embodiments, the stopper 600 is adhesively attached to the second flywheel 422 of the second rotor unit 420, but in other embodiments, the stopper 600 and the second flywheel 422 of the second rotor unit 420 are integrally molded. Because the overall volume of the blood pump 1 is small, the volume of the stopper 600 is also small, which requires high processing precision and makes assembly more difficult. By integrally molding the stopper 600 and the second flywheel 422, installation is easier and the adhesive process can be omitted.

[0063] Specifically, when the stopper 600 contacts the shaft sleeve 520, a gap for fluid flow is provided between the stopper 600 and the inner wall of the positioning cavity 112, and the shaft sleeve 520 and the rotor 400 are spaced apart by a certain distance. By providing a gap for fluid flow between the stopper 600 and the inner wall of the positioning cavity 112, the cleaning liquid passes through the gap between the stopper 600 and the inner wall of the positioning cavity 112 and contacts the wall of the shaft hole 522 of the shaft sleeve 520. Rotation axis 200 and5, thereby realizing fluid communication between the shaft hole 522 of the shaft sleeve 520 and the storage cavity 114. When the stopper 600 abuts against the shaft sleeve 520, the shaft sleeve 520 and the rotor 400 are spaced apart by a certain distance, thereby preventing the rotor 400 from directly contacting the shaft sleeve 520 and being rubbed and worn, i.e., preventing wear between the second rotor unit 420 and the shaft sleeve 520.

[0064] Specifically, the stopper 600 is substantially annular, and the central axis of the stopper 600 coincides with the axis of the rotary shaft 200. The outer diameter of the stopper 600 is smaller than the inner diameter of the positioning cavity 112, so that a gap for fluid flow is provided between the stopper 600 and the inner wall of the positioning cavity 112. In other embodiments, the stopper 600 may be formed by a plurality of annular sectors arranged at uniform intervals around the rotary shaft 200, or may be understood to be formed by an array of a plurality of annular sectors arranged discretely in the circumferential direction.

[0065] Specifically, shaft sleeve 520 has third groove 523 having concave third spherical wall 523a, and stopper 600 has convex stop surface 610. A portion of stopper 600 is positioned within third groove 523, so that stop surface 610 abuts against third spherical wall 523a. Convex stop surface 610 fits the shape of concave third spherical wall 523a, and third spherical wall 523a can abut against stop surface 610 so as to restrict movement of rotating shaft 200 along the axis of rotating shaft 200 in a direction approaching impeller 20. Furthermore, the contact surfaces between the two are arcuate surfaces, which provides a large contact area and reduces wear. More specifically, the diameter of the cavity surrounded by the third spherical wall 523a is smaller than the diameter of the shaft sleeve 520, so that the third groove portion 523 can serve to some extent to position the stopper 600 in the radial direction.

[0066] Specifically, the thickness of the stopper 600 along the axis of the rotating shaft 200 is greater than the length of the third groove portion 523 along the axis of the rotating shaft 200, so that when the stopper 600 abuts against the shaft sleeve 520, the shaft sleeve 520 and the rotor 400 (specifically, the second rotor unit 420) are spaced apart by a certain distance. In some embodiments, the thickness of the stopper 600 along the axis of the rotating shaft 200 may be equal to or less than the length of the third groove portion 523 along the axis of the rotating shaft 200. In this case, it is possible to space the rotor 400 (specifically, the second rotor unit 420) and the stopper 600 by a certain distance in the direction along the axis of the rotating shaft 200, and this distance may be sufficient to space the shaft sleeve 520 and the rotor 400 apart by a certain distance when the stopper 600 abuts against the shaft sleeve 520.

[0067] Specifically, a guide groove 524 formed by locally recessing the surface of the shaft sleeve 520 facing the stopper 600 communicates with the shaft hole 522 of the shaft sleeve 520. When the stopper 600 abuts against the shaft sleeve 520, a portion of the guide groove 524 is not covered by the stopper 600. Therefore, when the stopper 600 abuts against the shaft sleeve 520, the stopper 600 blocks the gap between the shaft hole 522 of the shaft sleeve 520 and the rotating shaft 200, which may hinder the flow of cleaning fluid. However, when the stopper 600 abuts against the shaft sleeve 520, the guide groove 524 that is not covered by the stopper 600 allows fluid to flow, ensuring smooth flow of cleaning fluid. In addition, the surface of the shaft sleeve 520 facing the stopper 600 is locally recessed to form a guide groove 524, which allows the cleaning liquid to flow more smoothly between the stopper 600 and the shaft sleeve 520, lubricating the contact surfaces between the stopper 600 and the shaft sleeve 520, reducing friction between the stopper 600 and the shaft sleeve 520, and reducing the problem of wear caused by friction between the stopper 600 and the shaft sleeve 520.

[0068] Specifically, the roughness of at least one of the stop surface 610 and the third spherical wall 523a is 0.1 μm or less. In some embodiments, the roughness of both the stop surface 610 and the third spherical wall 523a is 0.1 μm or less. In some embodiments, the roughness of one of the stop surface 610 and the third spherical wall 523a is 0.1 μm or less. Reducing the roughness of at least one of the stop surface 610 and the third spherical wall 523a effectively reduces the frictional force between the stop surface 610 and the third spherical wall 523a, thereby reducing wear problems due to friction between the shaft sleeve 520 and the stopper 600.

[0069] In some embodiments, at least one of the stop surface 610 and the third spherical wall 523a is a ceramic surface. Ceramics have high processing precision, high biocompatibility, high mechanical strength, excellent wear resistance, and corrosion resistance. In this case, the stopper 600 and the shaft sleeve 520 may be made of ceramic, or one of the stop surface 610 and the third spherical wall 523a may be made of ceramic by applying a ceramic coating. In some embodiments, the stop surface 610 is made of diamond, which provides the stop surface 610 with high hardness, a smooth surface, and wear resistance. In this case, the stop surface 610 is made of ceramic by applying a diamond coating.

[0070] In some embodiments, at least one of the rotating shaft 200, the shaft sleeve 520, the support member 510, and the sphere 900 is made of ceramic. Compared to metallic materials, ceramic has high processing precision, high biocompatibility, high mechanical strength, and excellent wear resistance and corrosion resistance. Alternatively, at least one of the rotating shaft 200, the shaft sleeve 520, the support member 510, and the sphere 900 has a roughness of 0.1 μm or less.

[0071] It should be understood that the configuration of the drive mechanism 10 is not limited to the above-described configuration. In some embodiments, the rotor 400 has one rotor unit and the stator 300 has one stator unit, in which case the rotor unit is located adjacent to the shaft sleeve 520 and the stator unit is located adjacent to the support member 510. In some embodiments, the rotor 400 still has the first rotor unit 410 and the second rotor unit 420, but the number of stator units of the stator 300 is one, in which case the stator unit is located between the first rotor unit 410 and the second rotor unit 420, and the stator unit can simultaneously rotate and drive the first rotor unit 410 and the second rotor unit 420.

[0072] The above embodiments are merely for illustrating the technical aspects of the present invention, and are not intended to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art will understand that the technical solutions described in the above embodiments may be modified or some of the technical features therein may be equivalently substituted, and such modifications or substitutions will not deviate from the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and all of them should be included in the protection scope of the present invention.

Claims

1. A drive mechanism comprising: a housing assembly; a rotating assembly including a distal end rotatably mounted to the housing assembly and a proximal end defining a first groove having a first concave spherical wall, the second groove being defined in the housing assembly opposite the first groove and having a second concave spherical wall; a sphere partially positioned within the first groove portion and partially positioned within the second groove portion, the sphere slidably abutting the first spherical wall and the second spherical wall, respectively.

2. 2. The drive mechanism according to claim 1, wherein an opening edge of the first groove portion adjacent to the second groove portion and an opening edge of the second groove portion adjacent to the first groove portion are each rounded.

3. 2. The drive mechanism according to claim 1, wherein the diameter of the sphere is greater than the sum of the lengths of the first groove and the second groove along the rotation axis of the rotating assembly.

4. a length of the first groove along the rotation axis of the rotating assembly is equal to or greater than ¼ of a diameter of the sphere and is less than ½ of a diameter of the sphere; and / or the length of the second groove portion along the rotation axis of the rotating assembly is equal to or greater than 1 / 4 of the diameter of the sphere and less than 1 / 2 of the diameter of the sphere.

5. the second groove portion has a first opening and a second opening, the first opening is closer to the first groove portion than the second opening, and a central axis of the first opening and a central axis of the second opening coincide with each other; 2. The drive mechanism according to claim 1, wherein the second opening is located at the center of the second spherical wall, and / or the diameter of the second opening is 1 / 9 to 1 / 3 of the diameter of the sphere.

6. 2. The drive mechanism of claim 1, wherein the housing assembly includes a pump case and a support member attached to the pump case, the second groove portion being opened in the support member, the drive mechanism further includes a support seat portion fixed to the pump case, the support seat portion having a mounting cavity and a fluid supply hole communicating with the mounting cavity, the support member being attached within the mounting cavity, and the second groove portion being connected to the fluid supply hole.

7. the mounting cavity has a cavity bottom, one opening of the liquid supply hole is located at the cavity bottom, a support step portion is provided within the mounting cavity, and the support step portion abuts against the support member, thereby separating the support member and the cavity bottom by a certain distance; and / or a branch flow path is further opened in the support seat portion, the branch flow path is connected to the liquid feed hole, and the fluid that has entered the liquid feed hole can also flow into the pump case through the branch flow path, and / or the second groove portion has a first opening and a second opening, the first opening faces the first groove portion, the second opening communicates with the liquid feed hole, a communication hole is further opened in the support member, the communication hole communicates with the second opening and the liquid feed hole, and the communication hole has a constant length along the central axis of the first opening.

8. a communication hole communicating with the second groove portion is further formed in the support member, the communication hole communicating with the liquid feed hole; 7. The drive mechanism according to claim 6, wherein the communication hole is a linear hole, and / or the central axis of the communication hole coincides with the central axis of the cavity surrounded by the second spherical wall.

9. 7. The drive mechanism according to claim 6, wherein an opening of the first groove portion on a side adjacent to the second groove portion and an opening of the second groove portion on a side adjacent to the first groove portion are spaced apart by a certain distance, the distance separating the rotating assembly and the support member, and preventing friction between the rotating assembly and the support member when the rotating assembly swings radially.

10. 2. The drive mechanism of claim 1, wherein the housing assembly includes a pump case and an axle sleeve, the axle sleeve is attached to the pump case, the distal end of the rotating assembly rotatably passes through the axle sleeve, and the drive mechanism further includes a stopper fixed to the rotating assembly, the stopper being positioned between the axle sleeve and the sphere, and the stopper being configured to abut against the axle sleeve to stop the rotating assembly from moving in a direction away from the sphere.

11. 11. The drive mechanism according to claim 10, wherein the shaft sleeve has an axial hole, the rotating assembly rotatably passes through the axial hole, the surface of the shaft sleeve facing the stopper is locally recessed to form a guide groove communicating with the axial hole, and when the stopper abuts against the shaft sleeve, a portion of the guide groove is not covered by the stopper.

12. 12. The drive mechanism according to claim 11, wherein the pump case has an internal cavity, the internal cavity including a position limiting cavity and a storage cavity arranged along the axial direction of the pump case, and when the stopper abuts against the shaft sleeve, a gap is formed between the stopper and an inner wall of the position limiting cavity for fluid to flow therethrough.

13. 11. The drive mechanism according to claim 10, wherein the shaft sleeve has a third groove portion having a concave third spherical wall, and the stopper has a convex stop surface that can abut against the third spherical wall.

14. 14. The drive mechanism according to claim 13, further comprising a rotating shaft rotatably attached to the pump case, wherein a thickness of the stopper along the axis of the rotating shaft is greater than a length of the third groove portion along the axis of the rotating shaft.

15. 2. The drive mechanism of claim 1, wherein the housing assembly includes a pump case, a support member, and a shaft sleeve, the support member and the shaft sleeve being attached to the pump case, the second groove being opened in the support member, the distal end of the rotating assembly rotatably passing through the shaft sleeve, the sphere being movably housed in the pump case, the support member, the shaft sleeve, and the sphere being arranged along the rotation axis of the rotating assembly, and the support member, the shaft sleeve, and the sphere being configured to jointly limit the position of the rotating assembly.

16. 16. The drive mechanism of claim 15, wherein the rotating assembly includes a rotating shaft rotatably passing through the shaft sleeve and a rotor fixed to the rotating shaft, and the drive assembly further includes a stator, both of which are located between the support member and the shaft sleeve, and the stator is capable of generating a rotating magnetic field that rotates the rotor.

17. The drive mechanism of any one of claims 1 to 15, characterized in that the rotating assembly includes a rotating shaft and a rotor, the rotating shaft including a proximal end and a distal end rotatably attached to the housing assembly, the rotor including a first rotor unit fixed to the proximal end of the rotating shaft, and the first groove portion being opened in the first rotor unit.

18. the rotor further includes a second rotor unit, the second rotor unit is fixed to the rotating shaft and is located close to a distal end of the rotating shaft; the drive mechanism further includes a stator, the stator including a first stator unit and a second stator unit located along an axis of the rotating shaft, the first stator unit and the second stator unit both being located between the first rotor unit and the second rotor unit, the first stator unit being capable of driving the first rotor unit to rotate, and the second stator unit being capable of driving the second rotor unit to rotate; the first stator unit and the second stator unit both including a magnetic core and a coil, the coil being wound around the magnetic core; 18. The drive mechanism according to claim 17, further comprising a magnetically permeable member connected to the housing assembly, wherein the magnetic core of the first stator unit and the magnetic core of the second stator unit are both fixed to the magnetically permeable member, and the rotation shaft rotatably passes through the first stator unit, the second stator unit, and the magnetically permeable member.

19. 1. A blood pump including an impeller and a drive mechanism, The drive mechanism includes: a housing assembly; a rotating assembly including a distal end rotatably mounted to the housing assembly and a proximal end defining a first groove having a first concave spherical wall, the second groove being defined in the housing assembly opposite the first groove and having a second concave spherical wall; a sphere partially positioned within the first groove and partially positioned within the second groove, and slidably abutting the first spherical wall and the second spherical wall, respectively; The blood pump is characterized in that the impeller is connected to the rotating assembly and is configured so as to be able to rotate following the rotating assembly.

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