Drive device and blood pump

Abstract

The application relates to a driving device and a blood pump. The driving device comprises a shell, a rotating assembly, a stator and a proximal bearing. The rotating assembly is rotatably installed on the shell; the stator is fixed to the shell and can drive the rotor to rotate; and the proximal bearing comprises a proximal shaft sleeve, a proximal fitting and proximal balls. The proximal shaft sleeve is fixed to the proximal end of the shell; the proximal fitting is located at the distal side of the proximal shaft sleeve, the proximal fitting is axially opposite to the proximal shaft sleeve and can rotate relative to the proximal shaft sleeve, and the proximal fitting is fixed to the proximal end of the rotating assembly; the proximal balls are movably installed on one of the proximal shaft sleeve and the proximal fitting and are arranged at the outer periphery of the central axis of the rotating assembly, and the other one of the proximal shaft sleeve and the proximal fitting has a matching wall which is axially opposite to the spherical surface of the proximal balls.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a driving device and a blood pump. BACKGROUND

[0002] The interventional catheter pump, also known as a blood pump, is often used to push blood from a blood vessel into a patient's heart chamber to assist the patient's heart in pumping blood, thereby providing support for the patient's blood circulation. The blood pump generally comprises a driving device and an impeller. The driving device is fixedly connected to the impeller via a rotating shaft, so as to drive the impeller to rotate and drive the blood to flow. However, the conventional driving device is unstable during operation, and the working efficiency of the driving device is poor. SUMMARY

[0003] Therefore, it is necessary to provide a driving device and a blood pump aiming at improving the stability of the driving device during operation, reducing the loss during operation of the driving device, and thereby improving the working efficiency of the driving device.

[0004] In an embodiment of the present application, the driving device comprises a housing, a rotating assembly, a stator and a proximal bearing. The rotating assembly is rotatably mounted on the housing; the stator is fixedly connected to the housing and can drive the rotor to rotate; and the proximal bearing comprises a proximal shaft sleeve, a proximal fitting and proximal balls. The proximal shaft sleeve is fixed to the proximal end of the housing; the proximal fitting is located between the proximal shaft sleeve and the stator, the proximal fitting and the proximal shaft sleeve are opposite along the axial direction and can rotate relative to the proximal shaft sleeve, and the proximal fitting is fixedly connected to the proximal end of the rotating assembly; and the proximal balls are movably mounted in one of the proximal shaft sleeve and the proximal fitting, and the other one of the proximal shaft sleeve and the proximal fitting has a matching wall which is in abutment with the spherical surface of the proximal balls along the axial direction.

[0005] In some embodiments, the rotating assembly comprises a rotating shaft and a rotor fixedly connected to the rotating shaft, the distal end of the proximal fitting is fixedly connected to the proximal end of the rotating shaft; the proximal end of the proximal fitting is provided with a rotating column coaxial with the rotating shaft, and the rotating column rotatably penetrates the proximal shaft sleeve.

[0006] In some embodiments, the distal end of the proximal fitting is provided with a socket, and the proximal end of the rotating shaft is fixed in the socket; and / or the number of the proximal balls is a plurality of, and the plurality of proximal balls are arranged around the rotating column.

[0007] In some embodiments, the proximal shaft sleeve is provided with a proximal shaft hole, the rotating column rotatably penetrates the proximal shaft hole, the proximal end of the rotating column is provided with a limiting piece located on the side of the proximal shaft sleeve opposite to the proximal fitting and in abutment with the proximal shaft sleeve along the axial direction.

[0008] In some embodiments, the proximal end of the housing is provided with a fixing groove for mounting the proximal end fitting, and a proximal limiting groove distal to the fixing groove; the proximal end fitting is at least partially received in the proximal limiting groove, and the outer circumferential surface of the proximal end fitting is spaced apart from the inner circumferential surface of the proximal limiting groove by a gap.

[0009] In some embodiments, one of the proximal end sleeve and the proximal end fitting is provided with a proximal end mounting groove, and at least one proximal end ball is mounted in the proximal end mounting groove, and a portion of the proximal end ball extends outward from the slot opening of the proximal end mounting groove to abut against the abutting wall.

[0010] In some embodiments, the number of proximal end mounting grooves is a plurality, and the plurality of proximal end mounting grooves are arranged at intervals around the rotating shaft, and each of the proximal end mounting grooves is provided with at least one proximal end ball; or the number of proximal end mounting grooves is one, and the proximal end mounting groove is annularly arranged around the rotating assembly, and the proximal end mounting groove is provided with a plurality of proximal end balls, and the plurality of proximal end balls are arranged around the central axis of the rotating assembly.

[0011] In some embodiments, the proximal end mounting groove has a groove bottom wall and a groove side wall; the proximal end ball abuts against the groove bottom wall, and the proximal end ball is tangent to the groove side wall and has a tangent position, and the tangent position between the tangent position and the slot opening of the proximal end mounting groove is greater than or equal to 1 / 2 times the radius of the proximal end ball and less than the radius of the proximal end ball.

[0012] Alternatively, the proximal end ball has an axial height protruding outward from the slot opening of the proximal end mounting groove, and the axial height is greater than or equal to 1 / 3 times the radius of the proximal end ball and less than the radius of the proximal end ball.

[0013] In some embodiments, the proximal end bearing at least has one of the following characteristics:

[0014] The spherical surface of the proximal end ball is a ceramic surface;

[0015] The diameter of the proximal end ball is 0.4mm-0.7mm;

[0016] The proximal end ball is radially spaced apart from the rotating column provided on the proximal end fitting by a distance;

[0017] The number of proximal end balls is a plurality, and the plurality of proximal end balls are arranged at intervals around the central axis of the rotating assembly;

[0018] At least two of the proximal end balls are located on opposite sides of the central axis of the rotating assembly.

[0019] In some embodiments, the matching wall is provided with an annular groove, which surrounds the central axis of the rotating assembly; a part of the proximal end ball is accommodated in the annular groove.

[0020] In some embodiments, the annular groove has a ring bottom wall and ring side walls on both sides of the ring bottom wall; the annular groove further has at least one of the following features:

[0021] The ring bottom wall is perpendicular to the central axis of the rotating assembly and is tangent to the spherical surface of the proximal end ball;

[0022] The ring side wall is provided in a concave arc shape;

[0023] The annular groove is provided with a rounded wall at the slot opening;

[0024] The radial width of the annular groove gradually decreases in the direction from the proximal end sleeve to the proximal end fitting.

[0025] In some embodiments, the matching wall is a flat wall without concave-convex structure, and further has at least one of the following features:

[0026] The matching wall is perpendicular to the central axis of the rotating assembly and is tangent to the proximal end ball;

[0027] The matching wall is a ceramic surface.

[0028] In some embodiments, the rotating assembly includes a rotating shaft; the driving device further includes a distal end bearing, which includes:

[0029] A distal end sleeve fixed to the distal end of the shell, the rotating shaft being rotatably arranged through the distal end sleeve;

[0030] A distal end fitting accommodated inside the shell and fixed to the rotating assembly; and

[0031] A plurality of distal end spherical members arranged around the rotating shaft on one of the distal end sleeve and the distal end fitting; the other of the distal end sleeve and the distal end fitting has an abutting wall axially abutting the spherical surface of the distal end spherical member.

[0032] The application also provides a driving device, which comprises a housing, a rotating assembly, a stator and a proximal bearing. The rotating assembly is rotatably installed on the housing; the stator is fixedly connected with the housing and can drive the rotating assembly to rotate; the proximal bearing comprises a proximal sleeve, a proximal fitting and a proximal spherical protrusion. The proximal sleeve is fixed to the proximal end of the housing; the proximal fitting is located between the proximal sleeve and the stator, the proximal fitting is axially opposite to the proximal sleeve and can rotate relative to the proximal sleeve, the proximal fitting is fixedly connected with the rotating assembly; the proximal spherical protrusion is fixed to one of the proximal sleeve and the proximal fitting, and the other one of the proximal sleeve and the proximal fitting has a matching wall which is axially abutted with the spherical surface of the proximal spherical protrusion.

[0033] In some embodiments, the rotating assembly comprises a rotating shaft and a rotor fixedly connected with the rotating shaft, the distal end of the proximal fitting is fixedly connected with the proximal end of the rotating shaft; the proximal end of the proximal fitting is provided with a rotating column coaxial with the rotating shaft, and the rotating column is rotatably arranged through the proximal sleeve;

[0034] The distal end of the proximal fitting is provided with a socket for fixing the proximal end of the rotating shaft, or the number of the proximal spherical protrusions is plural, and the plural proximal spherical protrusions surround the rotating column.

[0035] In some embodiments, the proximal sleeve is provided with a proximal shaft hole, the rotating column is rotatably arranged through the proximal shaft hole; the proximal end of the rotating column is located on the side of the proximal sleeve away from the proximal fitting, and the circumferential surface of the proximal end of the rotating column is provided with a limiting piece which can be axially abutted with the proximal sleeve.

[0036] In some embodiments, the matching wall is provided with an annular groove which surrounds the outer periphery of the central axis of the rotating assembly; a part of the proximal spherical protrusion is accommodated in the annular groove.

[0037] In some embodiments, the annular groove has a ring bottom wall and ring side walls located on both sides of the ring bottom wall; the annular groove further has at least one of the following features:

[0038] The ring bottom wall is perpendicular to the central axis of the rotating assembly and is tangent to the spherical surface of the proximal spherical protrusion;

[0039] The ring side wall is provided in a concave arc shape;

[0040] The annular groove is provided with a rounded wall at the slot opening;

[0041] The radial width of the annular groove gradually decreases in the direction from the proximal sleeve to the proximal fitting.

[0042] In some embodiments, the proximal bearing further comprises at least one of the following features:

[0043] The spherical surface of the proximal spherical protrusion is a ceramic surface.

[0044] The diameter of the proximal spherical protrusion is 0.4mm-0.7mm.

[0045] The proximal spherical protrusion is radially spaced apart from a rotating column provided on the proximal fitting.

[0046] The proximal spherical protrusion is a plurality of proximal spherical protrusions, and the plurality of proximal spherical protrusions are arranged along the central axis of the rotating assembly.

[0047] At least two of the proximal spherical protrusions are located on opposite sides of the central axis of the rotating assembly.

[0048] In some embodiments, the proximal bearing further comprises at least one of the following features:

[0049] The fitting wall is perpendicular to the central axis of the rotating assembly and is tangent to the proximal spherical protrusion.

[0050] The fitting wall is a flat surface without concave-convex structure.

[0051] The fitting wall is a ceramic surface.

[0052] In some embodiments, the rotating assembly comprises a rotating shaft, and the driving device further comprises a distal bearing, the distal bearing comprising:

[0053] A distal shaft sleeve fixed to the distal end of the housing, the rotating shaft being rotatably arranged through the distal shaft sleeve.

[0054] A distal fitting accommodated inside the housing and fixed to the rotating assembly; and

[0055] A plurality of distal spherical members arranged around the rotating shaft, the plurality of distal spherical members being provided in one of the distal shaft sleeve and the distal fitting, and the other of the distal shaft sleeve and the distal fitting having an abutting wall axially abutting the spherical surface of the distal spherical member.

[0056] The application also provides a blood pump, the blood pump comprising an impeller and the driving device of any one of the above embodiments, the impeller being fixed to the distal end of the rotating shaft of the driving device.

[0057] In some embodiments, the blood pump further includes a cannula assembly, which is fixedly connected to the housing of the drive device; the proximal end of the cannula assembly has a proximal opening, and the distal end of the cannula assembly has a distal opening, one of the distal opening and the proximal opening being a blood inlet and the other being a blood outlet; the impeller is disposed within the cannula assembly.

[0058] The aforementioned drive device features a proximal bearing at the distal end of the housing. This proximal bearing comprises a proximal sleeve, a proximal fitting, and proximal balls. The proximal sleeve is fixedly connected to the proximal end of the housing. The proximal fitting is located between the proximal sleeve and the stator and is fixedly connected to the rotating assembly. The proximal balls are movably mounted on one of the proximal sleeve and the proximal fitting. The other of the proximal sleeve and the proximal fitting has a mating wall that abuts axially against the spherical surface of the proximal balls. Thus, the proximal sleeve, the proximal fitting, and the proximal balls combine to form an axial ball bearing. During start-up and operation of the drive device, the axial ball bearing maintains axial abutment against the mating wall through the proximal balls, making axial displacement of the rotating assembly less likely. This prevents collisions between the rotating assembly and the fixed components at the proximal end of the housing, improving the stability of the rotating assembly's operation, reducing the risk of drive device failure, and extending its service life. Furthermore, when the rotating assembly is working, the proximal balls of the axial ball bearing can be driven by the rotating assembly to roll. The friction between the proximal balls and the mating wall is rolling friction, which has low frictional resistance. This effectively reduces the resistance encountered by the rotating assembly during rotation, reduces the power loss of the drive device in overcoming resistance, and improves the working efficiency of the drive device. Attached Figure Description

[0059] FIG. 1 This is a schematic diagram of one embodiment of the blood pump provided in this application.

[0060] FIG. 2 for FIG. 1 A partial structural diagram of the blood pump.

[0061] FIG. 3 A schematic diagram of the structure of the first embodiment of the driving device provided in this application.

[0062] FIG. 4 for FIG. 3 A schematic diagram of the structure of the distal part of the drive unit.

[0063] FIG. 5 for FIG. 4 Enlarged view of point P1 in the middle.

[0064] FIG. 6 for FIG. 3 A cross-sectional view of the first bearing in the middle.

[0065] FIG. 7 for FIG. 3Structure diagram of the proximal end part of the driving device.

[0066] FIG. 8 For FIG. 7 Enlarged view of P2.

[0067] FIG. 9 For FIG. 3 Structure diagram of the proximal end part of the driving device.

[0068] FIG. 10 For FIG. 9 Structure diagram of the proximal end part of the driving device.

[0069] FIG. 11-A And FIG. 11-B For FIG. 3 Structure diagram of the proximal end part of the driving device.

[0070] FIG. 12-A to FIG. 12-C For FIG. 10 Structure diagram of the proximal end part of the driving device.

[0071] FIG. 13-A And FIG. 13-B For FIG. 10 Structure diagram of the proximal end part of the driving device.

[0072] FIG. 14 Structure diagram of the proximal end part of the driving device.

[0073] FIG. 15 For FIG. 14 Structure diagram of the proximal end part of the driving device.

[0074] FIG. 16-A to FIG. 16-C For FIG. 14 Structure diagram of the proximal end part of the driving device.

[0075] FIG. 17-A to FIG. 17-C For FIG. 14 Structure diagram of the proximal end part of the driving device.

[0076] FIG. 18 Structure diagram of the proximal end part of the driving device.

[0077] FIG. 19 For FIG. 18 Structure diagram of the proximal end part of the driving device.

[0078] FIG. 20-A And FIG. 20-B For FIG. 18 Structure diagram of the proximal end part of the driving device.

[0079] FIG. 21 Structure diagram of the proximal end part of the driving device.

[0080] FIG. 22 Fig. 6 is a schematic view of a structure of a proximal end portion of a driving device according to a sixth embodiment of the present application. FIG. 21

[0081] FIG. 23 Fig. 6 is a schematic view of a structure of a proximal end portion of a driving device according to a sixth embodiment of the present application.

[0082] FIG. 24 FIG. 23 Fig. 6 is a schematic view of a structure of a proximal end portion of a driving device according to a sixth embodiment of the present application.

[0083] FIG. 25-A FIG. 25-B FIG. 24 Fig. 6 is a schematic view of a structure of a proximal end portion of a driving device according to a sixth embodiment of the present application. DETAILED DESCRIPTION

[0084] In order to make the above objectives, features and advantages of the present application more clear and comprehensible, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. It will be apparent, however, to one skilled in the art that the present application can be practiced in a variety of ways beyond the specific embodiments described herein without departing from the spirit of the present application, and it is intended that the present application cover all modifications and variations of this application provided they come within the scope of the appended claims and their equivalents.

[0085] In the description of the present application, it should be understood that, if there are terms such as "center", "longitudinal", "transverse", "length", "width", "film wall thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0086] In addition, if the terms "first", "second" appear, these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features referred to. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, if the term "plurality" appears, the meaning of "plurality" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0087] ​​​​In the present application, unless specifically defined otherwise and limited, if there are terms such as "mount", "connect", "connect", "fix", etc., these terms should be broadly understood. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0088] In the present application, unless specifically defined otherwise and limited, if there are similar descriptions such as "first feature on" or "second feature", the meaning can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" of the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" of the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0089] It should be noted that if an element is referred to as "fixed to" or "provided to" another element, it can be directly on another element or there can be a middle element. If an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. If present, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in the present application are for illustrative purposes only and are not the only embodiment.

[0090] It should be noted that "distal" and "proximal" throughout the text are only for indicating relative positional relationship, the "distal" of a component refers to the end that enters the patient's body first and / or is farther away from the operator during normal operation, and the "proximal" refers to the end that enters the patient's body later and / or is closer to the operator. As FIG. 2 As shown, the direction indicated by arrow Y+ is the direction of the proximal end pointing to the distal end; the direction indicated by arrow Y- is the direction of the distal end pointing to the proximal end.

[0091] Referring to FIG. 1 , the blood pump 1 mentioned in the present application is designed to be percutaneous intervention blood vessels for assisting heart pumping blood. The blood pump 1 can be a left heart interventional blood pump, or a right heart interventional blood pump. To avoid repetition, the following mainly takes the left heart interventional blood pump as an example for description. The blood pump of the embodiment of the present application is described below.

[0092] Referring to FIG. 1 and FIG. 2 , the blood pump 1 comprises a driving device 10 and an impeller 50; the impeller 50 is connected with a distal end of a rotating shaft 210 of the driving device 10. The driving device 10 drives the impeller 50 to rotate, and can drive blood to flow.

[0093] Referring to FIG. 1 and FIG. 2 , the blood pump 1 further comprises a cannula assembly 20, which is fixedly connected with a housing 100 of the driving device 10; a proximal end of the cannula assembly 20 is provided with a proximal opening 20a, and a distal end of the cannula assembly 20 is provided with a distal opening 20b; the impeller 50 is arranged in the cannula assembly 20. One of the proximal opening 20a and the distal opening 20b serves as a blood inlet, and the other serves as a blood outlet.

[0094] When the blood pump 1 is a right heart interventional blood pump, the blood pump 1 can be pushed to the pulmonary artery through the right ventricle and across the pulmonary valve, so that the proximal opening 20a is located in the right ventricle, and the distal opening 20b is located in the pulmonary artery. At this time, the proximal opening 20a is the blood inlet, and the distal opening 20b is the blood outlet.

[0095] When the blood pump 1 is a left heart interventional blood pump, the blood pump 1 can be pushed to the left ventricle through the aorta and across the aortic valve, so that the proximal opening 20a is located in the aorta, and the distal opening 20b is located in the left ventricle; at this time, the proximal opening 20a is the blood outlet, and the distal opening 20b serves as the blood inlet.

[0096] The cannula assembly 20 can comprise a cannula 21, an inlet pipe 23 and an outlet pipe 22. The outlet pipe 22 is provided with the proximal opening 20a, and the outlet pipe 22 is connected with a proximal end of the cannula 21 and a distal end of the driving device 10. The inlet pipe 23 is provided with the distal opening 20b, and the inlet pipe 23 is connected with a distal end of the cannula 21. It can be understood that the outlet pipe 22 is not necessary, and the proximal opening 20a can be directly arranged on the cannula 21. Similarly, the inlet pipe 23 is also not necessary, and the distal opening 20b can also be directly arranged on the cannula 21.

[0097] Referring to FIG. 1 and FIG. 2 , the blood pump 1 further comprises a catheter 40, which is fixedly connected with a proximal end of the driving device 10. The catheter 40 is used for accommodating wires, flushing pipelines and other wire bodies of the driving device 10.

[0098] Referring to FIG. 1 and FIG. 2The blood pump 1 further comprises a non-invasive flexible member 30, which is fixed to the distal end of the cannula assembly 20. In this embodiment, the non-invasive flexible member 30 is connected to the distal end of the inlet tube 23 of the cannula assembly 20. The non-invasive flexible member 30 is capable of contacting the inner wall of the tissue to position the blood pump 1. The non-invasive flexible member 30 is made of a flexible material, so that the non-invasive flexible member 30 is flexible and prevents the non-invasive flexible member 30 from damaging the tissue.

[0099] The driving device 10 in the embodiments of the present application will be described in detail below.

[0100] FIG. 3 to FIG. 13-B A first embodiment of the driving device 10 of the present application is shown. In this first embodiment, the driving device 10 comprises a housing 100, a rotating assembly 200, and a stator 300. The rotating assembly 200 comprises a rotating shaft 210 and a rotor 220 fixed to the rotating shaft 210. The rotating shaft 210 is rotatably mounted to the housing 100, and the rotating shaft 210 penetrates the distal end of the housing 100 and has a connecting end 211 outside the housing 100. The connecting end 211 is the distal end of the rotating shaft 210. The stator 300 is fixed to the housing 100 and is capable of driving the rotor 220 to rotate, thereby driving the rotating shaft 210 to rotate.

[0101] In combination FIG. 2 And FIG. 3 It is to be noted that the housing 100 is cylindrical. The distal end of the housing 100 is fixed to the proximal end of the cannula assembly 20, and the proximal end of the housing 100 is fixed to the distal end of the catheter 40. The housing 100 is provided with a receiving cavity 101, and the stator 300 and the rotor 220 are both received in the receiving cavity 101 and are arranged in the axial direction of the housing 100.

[0102] It is to be noted that the housing 100 is cylindrical. The distal end of the housing 100 is fixed to the proximal end of the cannula assembly 20, and the proximal end of the housing 100 is fixed to the distal end of the catheter 40. The housing 100 is provided with a receiving cavity 101, and the stator 300 and the rotor 220 are both received in the receiving cavity 101 and are arranged in the axial direction of the housing 100. FIG. 3 to FIG. 5 It is to be noted that the housing 100 is cylindrical. The distal end of the housing 100 is fixed to the proximal end of the cannula assembly 20, and the proximal end of the housing 100 is fixed to the distal end of the catheter 40. The housing 100 is provided with a receiving cavity 101, and the stator 300 and the rotor 220 are both received in the receiving cavity 101 and are arranged in the axial direction of the housing 100.

[0103] FIG. 3 It is to be noted that the housing 100 is cylindrical. The distal end of the housing 100 is fixed to the proximal end of the cannula assembly 20, and the proximal end of the housing 100 is fixed to the distal end of the catheter 40. The housing 100 is provided with a receiving cavity 101, and the stator 300 and the rotor 220 are both received in the receiving cavity 101 and are arranged in the axial direction of the housing 100.

[0104] It is to be noted that the housing 100 is cylindrical. The distal end of the housing 100 is fixed to the proximal end of the cannula assembly 20, and the proximal end of the housing 100 is fixed to the distal end of the catheter 40. The housing 100 is provided with a receiving cavity 101, and the stator 300 and the rotor 220 are both received in the receiving cavity 101 and are arranged in the axial direction of the housing 100. FIG. 3 ​The rotor 220 further comprises a second rotor 222, which is arranged on the opposite side of the stator 300 along the axial direction of the stator 300. That is, the stator 300 is arranged between the first rotor 221 and the second rotor 222. The stator 300 is also capable of driving the second rotor 222 to rotate.

[0105] The first rotor 221 and the second rotor 222 can only have one of them. Any one of the rotors 220 can comprise a plurality of magnets arranged in a ring shape along the outer periphery of the rotating shaft 210. For example, the plurality of magnets are arranged in a Halbach array magnetic ring. Any one of the rotors 220 can further comprise a flywheel fixedly connected to the rotating shaft 210, and the plurality of magnets are mounted on the flywheel. It can be understood that the flywheel can be a disc-shaped bracket or a cylindrical bracket.

[0106] Referring to FIG. 3 The stator 300 comprises a first stator 310, and the rotating shaft 210 is rotatably arranged through the first stator 310. The first stator 310 is arranged close to the first rotor 221 and is capable of driving the first rotor 221 to rotate. The stator 300 further comprises a second stator 320, which is arranged along the axial direction of the first stator 310. The rotating shaft 210 is rotatably arranged through the second stator 320. The second stator 320 is arranged close to the second rotor 222 and is capable of driving the second rotor 222 to rotate. It can be understood that the second stator 320 is not necessarily provided. In other embodiments, only the first stator 310 can be provided.

[0107] Referring to FIG. 3 , FIG. 7 and FIG. 8 The driving device 10 further comprises a proximal end bearing 500 arranged at the proximal end of the housing 100. The proximal end bearing 500 comprises a proximal end sleeve 510, a proximal end fitting 520 and proximal end balls 530. The proximal end sleeve 510 is fixedly connected to the proximal end of the housing 100. The proximal end fitting 520 is arranged between the proximal end sleeve 510 and the stator 300. The proximal end fitting 520 is axially opposite to the proximal end sleeve 510 and is capable of rotating relative to the proximal end sleeve 510. The rotating assembly 200 and the proximal end fitting 520 are fixedly connected so as to drive the proximal end fitting 520 to rotate. The proximal end balls 530 are movably arranged in one of the proximal end sleeve 510 and the proximal end fitting 520. The other one of the proximal end sleeve 510 and the proximal end fitting 520 has a matching wall 502, which is axially opposite to the spherical surface 501 of the proximal end balls 530 and abuts against the spherical surface 501 of the proximal end balls 530.

[0108] Specifically in the first embodiment, the proximal end ball 530 of the proximal end bearing 500 is movably mounted on the proximal end sleeve 510; and the proximal end fitting 520 has a matching wall 502, which abuts against the proximal end ball 530 on the proximal end sleeve 510. Specifically, the housing 100 further comprises a fixing pin 140, which is fixed to the proximal end of the housing 100. The fixing pin 140 is provided with a fixing groove 141, in which the proximal end sleeve 510 is mounted. When the rotating assembly 200 has a tendency to move in the Y-direction, the proximal end ball 530 of the proximal end bearing 500 and the matching wall 502 remain abutting, so that the rotating assembly 200 cannot move in the Y-direction, reducing the risk of axial displacement of the rotating assembly 200.

[0109] The driving device 10 described above is provided with a proximal end bearing 500 at the distal end of the housing 100, which comprises a proximal end sleeve 510, a proximal end fitting 520 and a proximal end ball 530; wherein the proximal end sleeve 510 is fixedly connected to the proximal end of the housing 100, the proximal end fitting 520 is located between the proximal end sleeve 510 and the stator 300 and is fixedly connected to the rotating assembly 200; the proximal end ball 530 is movably mounted on one of the proximal end sleeve 510 and the proximal end fitting 520; the other of the proximal end sleeve 510 and the proximal end fitting 520 is provided with a matching wall 502, which abuts against the spherical surface 501 of the proximal end ball 530 in the axial direction. In this way, the proximal end sleeve 510, the proximal end fitting 520 and the proximal end ball 530 combine to form an axial ball bearing. During the start-stop and operation of the driving device 10, the axial ball bearing remains abutting against the abutting wall 402 in the axial direction through the proximal end ball 530, so that the rotating assembly 200 is not prone to axial displacement, thereby preventing the fixed components at the proximal end of the rotating assembly 200 and the housing 100 from colliding, improving the stability of the operation of the rotating assembly 200, reducing the risk of failure of the driving device 10 and prolonging the service life. On the other hand, when the rotating assembly 200 is rotating, the proximal end ball 530 of the axial ball bearing can be driven to roll by the rotating assembly 200, and the rolling friction between the proximal end ball 530 and the matching wall 502 is small, effectively reducing the resistance received by the rotating assembly 200 during rotation, reducing the power consumed by the driving device 10 to overcome the resistance and improving the working efficiency of the driving device 10.

[0110] The number of proximal end balls 530 can be multiple. In the present application, multiple means two or more than two. The multiple proximal end balls 530 are arranged around the central axis of the rotating assembly 200. The multiple proximal end balls 530 of the axial ball bearing jointly support the rotating assembly 200 from different directions of the outer periphery of the central axis of the rotating assembly 200, effectively preventing the rotating shaft 210 from radial deflection, so that the rotating assembly 200 can operate smoothly.

[0111] Optionally, the plurality of proximal balls 530 are arranged at intervals around the central axis of the rotating assembly 200. In this way, a smaller number of proximal balls 530 can be used. In this way, not only can the weight of the drive device 10 be reduced, so that the blood pump 1 has a lighter weight, but also the power required to start the drive device 10 can be reduced, so that the rotating assembly 200 can be started smoothly.

[0112] Generally, the distal end of the housing 100 (specifically, the distal shaft sleeve 410) has a distal shaft hole 411 through which the rotating shaft 210 of the rotating assembly 200 passes, and a gap is left between the rotating shaft 210 and the inner circumferential surface of the distal shaft hole 411. This gap is used for the flushing liquid inside the housing 100 to be discharged into the cannula assembly 20 of the blood pump 1, so as to prevent blood from flowing back into the interior of the housing 100. Due to the presence of the gap, the rotating shaft 210 may

[0113] To put it another way, even if the rotating assembly 200 has a small amount of radial deflection, the distal bearing 400 will contact the matching wall 502 using one of the proximal balls 530 as a fulcrum, and the proximal ball 530 on the other side will be slightly loose from the matching wall 502 for a short time, thereby reducing the number of proximal balls 530 in contact with the matching wall 502, reducing the contact points between the proximal fitting 520 and the proximal shaft sleeve 510, and further reducing the resistance experienced by the rotating shaft 210 during deflection, avoiding the rotating shaft 210 from being stuck, so that the rotating shaft 210 can more easily return to its original stable state.

[0114] In FIG. 11-A and FIG. 11-B A schematic diagram of the rotating shaft having a small amount of radial deflection is shown:

[0115] Referring to FIG. 11-A When the rotating shaft 210 is deflected radially to the right, the proximal shaft sleeve 510 uses the proximal ball 530 on its left side as a fulcrum to support the deflection of the rotating shaft 210, and the proximal ball 530 on the right side of the proximal shaft sleeve 510 is slightly loose from the matching wall 502 for a short time, so that only the proximal ball 530 on the left side of the proximal shaft sleeve 510 is in contact with the matching wall 502.

[0116] Referring to FIG. 11-B, on the contrary, when the rotating shaft 210 swings to the left side in the radial direction, the proximal end sleeve 510 swings around the proximal end ball 530 on the right side of the proximal end sleeve 510 to support the rotating shaft 210 to swing; the proximal end ball 530 on the left side of the proximal end sleeve 510 is temporarily slightly loose with the matching wall 502, at this time, only the proximal end ball 530 on the right side of the proximal end sleeve 510 keeps abutting against the matching wall 502.

[0117] Therefore, if the rotating assembly 200 swings in the radial direction with a small amplitude, the proximal end sleeve 510 will contact the matching wall 502 around the proximal end ball 530 on one side, and the proximal end ball 530 on the other side will be temporarily slightly loose with the matching wall 502, thereby reducing the number of contact points between the proximal end fitting 520 and the proximal end ball 530, and further reducing the resistance received by the rotating shaft 210 during the swing.

[0118] It can be understood that the number of proximal end balls 530 can also be one. For example, in other embodiments, the proximal end bearing 500 only includes one proximal end ball 530, which is movably mounted on the proximal end sleeve 510; the proximal end bearing 500 further includes at least one proximal end spherical protrusion 540 (see FIG. 18 to FIG. 20-B ), which is fixed to the proximal end sleeve 510, the proximal end spherical protrusion 540 and the proximal end ball 530 are arranged around the central axis of the rotating assembly 200, and the proximal end spherical protrusion 540 and the proximal end ball 530 both have spherical surfaces 501, and the spherical surfaces 501 of the two abut against the abutting wall 402 on the proximal end fitting 520 in the axial direction.

[0119] Referring to FIG. 7 and FIG. 12-A to FIG. 12-C , the proximal end fitting 520 is provided in a disc-shaped structure. The proximal end fitting 520 is accommodated in the accommodation cavity 101 of the housing 100. Since the proximal end ball 530 is movably mounted on the proximal end sleeve 510; the proximal end surface of the proximal end fitting 520 facing the proximal end sleeve 510 is the matching wall 502, which is located on the far side of the proximal end ball 530 and abuts against the proximal end ball 530.

[0120] Optionally, the distal end of the proximal end fitting 520 is fixed to the proximal end of the rotating shaft 210. The proximal end of the proximal end fitting 520 is provided with a rotating column 522 coaxial with the rotating shaft 210, and the rotating column 522 is rotatably arranged in the proximal end sleeve 510. Specifically, the proximal end sleeve 510 is provided with a proximal end shaft hole 512, and the proximal end shaft hole 512 is rotatably arranged in the rotating column 522. At this time, the plurality of proximal end balls 530 are specifically arranged around the rotating column 522 at intervals.

[0121] The proximal end fitting 520 can be a separate component, i.e., the proximal end fitting 520 is formed separately from the rotating shaft 210, and the proximal end fitting 520 can be connected and fixed to the rotating shaft 210 by welding or adhesion, etc. In some embodiments, the proximal end fitting 520 can also be integrally formed with the rotating shaft 210. In the present embodiment, the proximal end fitting 520 is formed separately from the rotating shaft 210. Specifically, the distal end of the proximal end fitting 520 is also provided with a socket 521, and the proximal end of the rotating shaft 210 is fixed in the socket 521. The proximal end of the rotating shaft 210 and the socket 521 are connected by welding or filled with adhesive.

[0122] Optionally, the socket 521 is a blind hole, and the socket 521 has a bottom wall 521a; the proximal end of the rotating shaft 210 is an installation end 212, and the installation end 212 is fixed in the socket 521, and the end face of the installation end 212 abuts against the bottom wall 521a.

[0123] Generally, in some conventional technologies, the proximal end of the rotating shaft 210 is generally provided with a ball head, and an active recess is arranged at the proximal end of the housing 100, so that the ball head of the rotating shaft 210 is installed in the active recess, and the ball head abuts against the inner wall of the active recess and can move in the active recess. Since the distal end of the rotating shaft 210 passes through the shaft hole at the distal end of the housing 100, when the ball head of the rotating shaft 210 is installed in the spherical recess, the rotating shaft 210 and the spherical recess need to be kept in high coaxiality, so that the ball head of the rotating shaft 210 can be smoothly installed in the spherical recess. That is, the rotating shaft 210 of the driving device 10 in the conventional technology is assembled by the ball head and the spherical recess, and the coaxiality of the rotating shaft 210 and the spherical recess is required to be high, which increases the manufacturing difficulty of the driving device 10.

[0124] By comparison, in the present embodiment, the proximal end of the rotating shaft 210 of the driving device 10 does not need to be provided with a ball head, and the proximal end of the rotating shaft 210 can be directly fixed to the socket 521 of the proximal end fitting 520, and the proximal end of the rotating shaft 210 does not need to abut against the inner wall of the socket 521, so the coaxiality requirement of the rotating shaft 210 and the socket 521 is relatively small. Moreover, during assembly, the plurality of proximal end balls 530 between the proximal end fitting 520 and the proximal end shaft sleeve 510 roll relative to the fitting wall 502, so that the position of the proximal end fitting 520 (i.e., the position of the rotating column 522) can be finely adjusted, so that the rotating column 522 and the proximal end shaft sleeve 510 tend to be coaxial, and thus the assembly difficulty of the proximal end fitting 520 and the proximal end shaft sleeve 510 can be reduced. As can be seen, the proximal end bearing 500 can reduce the coaxiality requirement of the rotating shaft 210 and the proximal end bearing 500 during installation of the rotating shaft 210, thereby reducing the assembly difficulty of the rotating shaft 210 and improving the assembly efficiency.

[0125] Of course, the rotating column 522 is not necessarily required. In other embodiments, the rotating shaft 210 can pass through the proximal end fitting 520 such that the proximal end of the rotating shaft 210 is rotatably inserted into the proximal end shaft hole 512 of the proximal end shaft sleeve 510. In this case, the plurality of proximal end balls 530 are specifically arranged at intervals around the rotating shaft 210.

[0126] Referring to FIG. 7 , the proximal end of the shell 100 is further provided with a proximal end limiting groove 143 located distally of the fixing groove 141; the diameter of the proximal end limiting groove 143 is greater than that of the fixing groove 141, and the proximal end fitting 520 is at least partially accommodated in the proximal end limiting groove 143, with a gap between the outer circumferential surface of the proximal end fitting 520 and the inner circumferential surface of the proximal end limiting groove 143.

[0127] Due to the existence of the gap, when the rotating assembly 200 drives the proximal end fitting 520 to rotate, the outer circumferential surface of the proximal end fitting 520 is not easy to contact the inner circumferential surface of the proximal end limiting groove 143, so that friction between the proximal end fitting 520 and the inner circumferential surface of the proximal end limiting groove 143 can be avoided. Since the proximal end fitting 520 is limited to rotate in the proximal end limiting groove 143, the rotating assembly 200 is not easy to occur large amplitude deflection.

[0128] Referring to FIG. 7 , FIG. 9 and FIG. 10 , for the proximal end shaft sleeve 510, the proximal end shaft sleeve 510 is an independent component part, which can be connected and fixed with the shell 100 by means of bonding, welding, etc. Alternatively, the proximal end of the shell 100 is provided with a fixing pin 140 provided with a fixing groove 141; the proximal end shaft sleeve 510 is installed in the fixing groove 141. Of course, in other embodiments, the proximal end shaft sleeve 510 can be a component part integrally formed with the shell 100.

[0129] The proximal end shaft sleeve 510 has a second end surface 511, and the second end surface 511 and the matching wall 502 of the proximal end fitting 520 are axially opposite and spaced apart. The plurality of proximal end balls 530 are movably installed in the proximal end shaft sleeve 510, and a part of each proximal end ball 530 protrudes from the first end surface 421, i.e. a part of the proximal end ball 530 is located between the second end surface 511 and the matching wall 502 to abut against the matching wall 502.

[0130] Referring to FIG. 8 and FIG. 13-A and FIG. 13-BThe proximal end sleeve 510 is provided with proximal end mounting slots 503, each of which has a slot opening 503c, and each of which is mounted with a proximal end ball 530. A part of the outer circumferential surface of the proximal end ball 530 extends outward from the slot opening 503c of the proximal end mounting slot 503, so that the proximal end ball 530 has an embedded part 532 accommodated inside the proximal end mounting slot 503, and an outward protruding part 531 extending outside the proximal end mounting slot 503. The spherical surface 501 on the outward protruding part 531 abuts against the matching wall 502.

[0131] It can be understood that the proximal end ball 530 is a sphere. The entire outer circumferential surface of the proximal end ball 530 is a spherical surface. Therefore, no matter in which direction or to which position the proximal end ball 530 rolls, the proximal end ball 530 will have the outward protruding part 531 outside the proximal end mounting slot 503, so that the spherical surface 501 on the outward protruding part 531 can abut against the matching wall 502.

[0132] Specifically, the proximal end sleeve 510 is provided with a plurality of proximal end mounting slots 503, which are arranged at intervals around the central axis of the rotating assembly 200 (specifically, around the rotating column 522 or the rotating shaft 210). Each of the proximal end mounting slots 503 is mounted with at least one proximal end ball 530. Since the plurality of proximal end balls 530 are respectively mounted in different proximal end mounting slots 503, the proximal end ball 530 in each proximal end mounting slot 503 does not interfere with the proximal end balls 530 in other proximal end mounting slots 503. When the rotating assembly 200 rotates, the plurality of proximal end balls 530 are driven by the rotating assembly 200 to respectively roll in their corresponding proximal end mounting slots 503, and the proximal end balls 530 in any two adjacent proximal end mounting slots 503 do not press against each other, so that each proximal end ball 530 can freely roll. Therefore, the proximal end balls 530 at different positions can adaptively move according to the size and direction of the force they receive. Moreover, the power required for starting the driving device 10 can be reduced, so that the rotating assembly 200 can be started smoothly.

[0133] Of course, in other embodiments, the proximal end sleeve 510 can also be provided with only one proximal end mounting slot 503, which is annular and surrounds the central axis of the rotating assembly 200. The proximal end mounting slot 503 is mounted with a plurality of proximal end balls 530, which surround the central axis of the rotating assembly 200.

[0134] Referring to FIG. 8 and FIG. 13-A to FIG. 13-B The outward protruding part 531 of the proximal end ball 530 has an abutting point N1 for abutting against the matching wall 502, and the axial distance between the abutting point N1 and the slot opening 503c is also the axial height H of the proximal end ball 530 extending outward from the slot opening 503c of the proximal end mounting slot 503.n1 If the axial height H n1 is too small, the distance between the second end face 511 and the mating wall 502 is small, and the two are prone to interference, affecting the stability of the rotation of the rotating shaft 210.

[0135] Therefore, optionally, the axial height H n1 is greater than or equal to 1 / 3 times the radius of the proximal ball 530. Thus, H n1 ≥ 1 / 3R; wherein R = 1 / 2D n , and R represents the radius of the proximal ball 530, and D n represents the diameter of the proximal ball 530. In this way, after the outer convex part 531 abuts against the mating wall 502, the second end face 511 and the mating wall 502 are spaced apart by a sufficient distance, and the two are not prone to interference, improving the stability of the rotation of the rotating shaft 210.

[0136] Of course, the axial height H n1 should not be designed to be too large, otherwise it will occupy a large axial space of the shell 100; and when the proximal ball 530 moves, the proximal ball 530 is also prone to falling out of the proximal mounting groove 503. Therefore, optionally, the axial height H n1 is less than the radius of the proximal ball 530, i.e., H n1 <R. In this way, the volume of the built-in part 532 of the proximal ball 530 accounts for at least half of the volume of the proximal ball 530, so that the center of the proximal ball 530 falls inside the proximal mounting groove 503, thereby reducing the risk of the proximal ball 530 falling out of the proximal mounting groove 503.

[0137] Referring to FIG. 13-A and FIG. 13-B , the proximal mounting groove 503 has a groove bottom wall 503a and a groove side wall 503b arranged along the circumference of the groove bottom wall 503a; the built-in part 532 of the proximal ball 530 abuts against the groove bottom wall 503a, and the built-in part 532 of the proximal ball 530 also tangentially abuts against the groove side wall 503b.

[0138] The groove bottom wall 503a is a plane wall perpendicular to the central axis of the proximal shaft sleeve 510. The proximal ball 530 is tangent to the groove bottom wall 503a, and the tangent position is the abutting position. In other embodiments, the groove bottom wall 503a can be a spherical wall.

[0139] The groove side wall 503b is perpendicular to the groove bottom wall 503a. The groove side wall 503b can be a cylindrical surface, and the contact between the proximal ball 530 and the groove side wall 503b is a line contact. The groove side wall 503b can also be composed of multiple planes, and the contact between the proximal ball 530 and the groove side wall 503b is a point contact. In other embodiments, the groove side wall 503b can form an inclined angle with the groove bottom wall 503a.

[0140] The position where the built-in part 532 of the proximal ball 530 is tangent to the slot side wall 503b is defined as the tangent position N2, and the tangent position N2 to the slot opening 503c of the proximal mounting slot 503 has a tangent depth H n2 . Obviously, the tangent depth H n2 needs to be smaller than the radius R of the proximal ball 530 (i.e. H n2 < R, R = 1 / 2D n , D n is the diameter of the proximal ball 530) so that a part of the proximal ball 530 protrudes outward from the slot opening 503c of the proximal mounting slot 503 to form the outward protruding part 531. However, the tangent depth H n2 should not be too small, otherwise the proximal ball 530 is prone to fall out of the proximal mounting slot 503.

[0141] Therefore, optionally, the tangent depth H n2 is greater than or equal to 1 / 2 times the radius of the proximal ball 530, i.e. 1 / 2R ≤ H n2 < R. In this way, the volume of the built-in part 532 of the proximal ball 530 is greater than or equal to half the volume of the proximal ball 530. In this way, the center of the proximal ball 530 falls inside the proximal mounting slot 503, thereby reducing the risk of the proximal ball 530 falling out of the proximal mounting slot 503. It can be understood that the sum of the tangent depth H n2 and the axial height H n1 is equal to the radius R of the proximal ball 530, i.e. H n1 + H n2 = R.

[0142] Referring to FIG. 13-A and FIG. 13-B , the plurality of proximal balls 530 are arranged around the central axis of the rotating assembly 200, which can be equidistant or non-equidistant arrangement. Specifically, the plurality of proximal balls 530 are arranged equidistantly around the central axis of the rotating assembly 200 to form a plurality of uniformly arranged fulcrums in the circumferential direction of the rotating assembly 200, so that the rotating shaft 210 is more stable.

[0143] Optionally, the plurality of proximal balls 530 are arranged equidistantly around the rotating column 522. There is an annular region around the rotating column 522; the plurality of proximal balls 530 are arranged in the annular region.

[0144] Optionally, at least two of the proximal balls 530 are located on opposite sides of the central axis of the rotating assembly 200. Specifically, two of the proximal balls 530 can be located on opposite sides of the rotating column 522. In this way, at least one fulcrum can be provided on each of the opposite sides (e.g., left and right sides or front and back sides) of the rotating shaft 210, which can reduce the radial deflection of the rotating shaft 210 along the left and right sides.

[0145] The number of the proximal balls 530 can be 2-10. For example, but not limited to, 3, 4, 5, 6, 8, etc.

[0146] When the number of the proximal balls 530 is 3, the 3 proximal balls 530 are arranged at equal intervals around the central axis of the rotating assembly 200, and the perpendicular connecting lines between the centers of the 3 proximal balls 530 and the central axis of the rotating assembly 200 form a Y shape.

[0147] When the number of the proximal balls 530 is 4, the 4 proximal balls 530 are arranged at equal intervals around the central axis of the rotating assembly 200, and the perpendicular connecting lines between the centers of the 4 proximal balls 530 and the central axis of the rotating assembly 200 form a cross shape.

[0148] The diameter D of the proximal ball 530 n may be 0.4-0.7 mm, i.e., 0.4 mm≤D≤0.7 mm. n For example, the diameter D of the proximal ball 530 can be, but is not limited to, 0.45 mm, 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, or 0.7 mm. n

[0149] The spherical surface 501 of the proximal ball 530 can be a ceramic surface. Specifically, the proximal ball 530 is made of ceramic material as a whole, so that the spherical surface 501 of the proximal ball 530 is a ceramic surface. Of course, in other embodiments, the proximal ball 530 can be made of hard metal material, and a layer of ceramic material is additionally provided on the spherical surface 501 of the proximal ball 530, so that the spherical surface 501 forms the ceramic surface. The ceramic material has high processing precision, high biocompatibility, high mechanical strength, good wear resistance, and good corrosion resistance.

[0150] Referring to FIG. 7 and FIG. 12-A to FIG. 12-C For the matching wall 502 abutting against the proximal ball 530, the matching wall 502 is provided with an annular groove 504 around the central axis of the rotating assembly 200. Since the rotating column 522 and the rotating assembly 200 are coaxial, the annular groove 504 is specifically around the rotating column 522. The part (i.e., the outer convex part 531) of the plurality of proximal balls 530 protruding from the proximal sleeve 510 is accommodated in the annular groove 504. ​

[0151] Specifically, the annular groove 504 extends along the outer circumference of the rotating column 522 for one full circle. The outer convex portions 531 of the plurality of proximal end balls 530 are arranged in intervals along the annular groove 504. When the rotating assembly 200 rotates, the plurality of proximal end balls 530 are confined to move in the annular groove 504, so that the rotating assembly 200 is less likely to be radially deflected.

[0152] Referring to FIG. 7 and FIG. 8 , the annular groove 504 has a ring bottom wall 504a and ring side walls 504b on both sides of the ring bottom wall 504a. Optionally, the ring bottom wall 504a is perpendicular to the central axis of the rotating shaft 210 and tangent to the outer convex portions 531 of the proximal end balls 530. In this way, the contact area between the proximal end balls 530 and the ring bottom wall 504a can be reduced, and the frictional resistance can be reduced.

[0153] Optionally, the depth of the annular groove 504 gradually decreases in the direction from the proximal end sleeve 510 to the proximal end fitting 520. The ring side walls 504b are concave arc-shaped. The ring side walls 504b are concave towards the direction away from the outer convex portions 531. In this way, the contact area between the spherical surfaces 501 of the proximal end balls 530 and the ring side walls 504b can be reduced, and the resistance to the movement of the proximal end balls 530 in the annular groove 504 can be reduced.

[0154] Optionally, a rounded wall 504c is arranged at the opening of the annular groove 504 to avoid sharp corners at the opening of the annular groove 504, so that the proximal end balls 530 are less likely to be abraded when contacting the location.

[0155] Of course, in other embodiments, the matching wall 502 can also be a flat wall without the concave-convex structure (such as the annular groove 504). The matching wall 502 is perpendicular to the central axis of the rotating shaft 210, so that the matching wall 502 is tangent to the proximal end balls 530. In this way, the contact between the plurality of proximal end balls 530 and the matching wall 502 is point contact at a plurality of scattered points, the contact area is small, and the frictional resistance is small. Moreover, if the rotating shaft 210 is radially deflected, the proximal end balls 530 can roll radially on the matching wall 502, the resistance to the movement of the proximal end balls 530 can be reduced, the rotating shaft 210 is less likely to be jammed, and the rotating shaft 210 is more likely to return to the original stable state.

[0156] The matching wall 502 can also be a ceramic surface. For example, the proximal end fitting 520 is made of ceramic material as a whole, so that the matching wall 502 of the proximal end fitting 520 is a ceramic surface. For another example, the proximal end fitting 520 can be made of hard metal material, and a layer of ceramic material is additionally arranged on the matching wall 502 to form the ceramic surface.

[0157] Referring to FIG. 7 and FIG. 9The rotating column 522 is rotatably arranged through the proximal shaft hole 512 of the proximal shaft sleeve 510, and the proximal end of the rotating column 522 is located on the side of the proximal shaft sleeve 510 which is opposite to the proximal accessory 520. The proximal bearing 500 further comprises a limiting member 523 which is arranged on the outer circumferential surface of the rotating column 522 and can abut against the proximal shaft sleeve 510.

[0158] Specifically, the limiting member 523 has a limiting surface 523a which can abut against the proximal shaft sleeve 510. During assembly, the proximal ball 530 can be first arranged in the proximal mounting groove 503 of the proximal shaft sleeve 510, then the rotating column 522 of the proximal accessory 520 is arranged through the proximal shaft hole 512 of the proximal shaft sleeve 510, and then the limiting member 523 and the rotating column 522 are fixedly connected, so that the proximal accessory 520, the proximal shaft sleeve 510, the proximal ball 530 and the limiting member 523 are assembled into an integrated proximal bearing 500. In this way, the proximal shaft sleeve 510 is equivalent to being clamped between the proximal end surface of the proximal accessory 520 and the limiting surface 523a of the limiting member 523, and the proximal ball 530 is less likely to fall out of the proximal mounting groove 503 of the proximal shaft sleeve 510 during installation of the proximal bearing 500, thereby reducing the difficulty of installing the proximal bearing 500 and improving the assembly efficiency.

[0159] In addition, when the rotating shaft 210 is offset in the Y+ direction, the limiting surface 523a of the limiting member 523 abuts against the proximal shaft sleeve 510 to limit the rotating shaft 210 from continuing to be offset in the Y+ direction, so that the offset amount of the rotating shaft 210 is smaller and the rotating shaft 210 operates more stably, and the distance between the proximal accessory 520 and the proximal shaft sleeve 510 can be prevented from increasing, thereby effectively preventing the proximal ball 530 from falling out of the proximal mounting groove 503.

[0160] The limiting member 523 is preferably made of a hard material. The hard material can be a metal material or a ceramic material. The limiting member 523 can be annular. In other embodiments, the limiting member 523 can also be a C-shaped open ring, such as an E-Ring ring. Alternatively, the limiting member 523 can also be a radial protruding blocking piece on the circumferential surface of the rotating column 522.

[0161] Referring to FIG. 3 and FIG. 7 The fixed groove 141 is provided with a sink groove 142 which can be communicated with the flushing pipeline of the catheter 40. The sidewall of the fixed groove 141 is provided with a fluid passage which communicates the sink groove 142 and the flushing flow channel inside the housing 100. The limiting member 523 is accommodated in the sink groove 142.

[0162] Preferably, at least one of the limiting member 523 and the proximal end of the rotating column 522 abuts against the bottom of the sink 142, so as to limit the movement of the rotating column 522 along the Y direction, thereby reducing the axial displacement of the rotating shaft 210. The outer diameter of the limiting member 523 can be smaller than the inner diameter of the sink 142, so that a space for the flow of the flushing liquid is formed between the outer circumferential surface of the limiting member 523 and the inner wall surface of the sink 142. The bottom of the sink 142 is provided with a liquid inlet hole (not shown in the figure), which is in communication with the flushing pipeline. The limiting member 523 does not block the liquid inlet hole.

[0163] FIG. 14 to FIG. 17-B A second embodiment of the driving device 10 of the present application is shown. The driving device 10 in the second embodiment is different from the driving device 10 in the first embodiment described above in that the proximal end ball 530 is movably mounted on the proximal end fitting 520; and the proximal end sleeve 510 is provided with a matching wall 502, which abuts against the spherical surface 501 of the proximal end ball 530.

[0164] The proximal end fitting 520 is also accommodated in the interior of the housing 100. Since the proximal end ball 530 is movably mounted on the proximal end fitting 520, the proximal end fitting 520 is correspondingly provided with a plurality of proximal end mounting grooves 503, which surround the outer circumference of the rotating column 522. One proximal end ball 530 is arranged in each proximal end mounting groove 503, and a part of the proximal end ball 530 protrudes from the opening of the proximal end mounting groove 503 to abut against the abutting wall 402 on the proximal end sleeve 510. The shape and structure of the proximal end mounting groove 503 can be implemented as described above in the first embodiment, and basically the same technical effects can be achieved, which will not be described here.

[0165] The proximal end sleeve 510 is fixed in the fixed groove 141 of the housing 100. The distal end wall of the proximal end sleeve 510 faces the proximal end fitting 520, so that the distal end wall of the proximal end sleeve 510 forms the matching wall 502. The matching wall 502 can be provided with an annular groove 504, so that the part of the proximal end ball 530 protruding from the proximal end mounting groove 503 can be accommodated in the annular groove 504. Of course, in other embodiments, the matching wall 502 can also be a flat wall without concave-convex structures (such as the annular groove).

[0166] The structures, positions and fixing modes of the proximal end sleeve 510 and the proximal end fitting 520 described above can be implemented as described above in the first embodiment, and basically the same technical effects can be achieved, which will not be described here.

[0167] For example, the proximal fitting 520 is provided with a rotating column 522 and a socket 521, similar to the first embodiment described above; the proximal end (i.e. the mounting end 212) of the rotating shaft 210 is fixed in the socket 521; the rotating column 522 is in rotational cooperation with the proximal shaft hole 512 provided on the proximal shaft sleeve 510. The structure, position and cooperation manner of the rotating column 522, the socket 521 and the proximal shaft hole 512 can refer to the first embodiment described above, and will not be repeated here.

[0168] FIG. 18 to FIG. 20-B A third embodiment of the driving device 10 of the present application is shown. The driving device 10 comprises a housing 100, a rotating assembly 200, a stator 300 and a proximal bearing 500: the proximal bearing 500 comprises a proximal shaft sleeve 510, a proximal fitting 520 and a proximal spherical protrusion 540. Among them, the proximal shaft sleeve 510 is fixedly connected with the proximal end of the housing 100, the proximal fitting 520 is located between the proximal shaft sleeve 510 and the stator 300, the proximal fitting 520 is axially opposite to the proximal shaft sleeve 510 and can rotate relative to the proximal shaft sleeve 510; the rotating assembly 200 and the proximal fitting 520 are fixedly connected to enable the proximal fitting 520 to rotate. The proximal spherical protrusion 540 is fixed to one of the proximal shaft sleeve 510 and the proximal fitting 520; the other of the proximal shaft sleeve 510 and the proximal fitting 520 has a cooperation wall 502, and the cooperation wall 502 is axially opposite to the spherical surface 501 of the proximal spherical protrusion 540. The axial opposite means that the cooperation wall 502 and the spherical surface 501 of the proximal spherical protrusion 540 are axially opposite and abut each other. That is, the driving device 10 in the third embodiment uses the proximal spherical protrusion 540 to replace the proximal ball 530 in the first to third embodiments described above.

[0169] Specifically in this third embodiment, the proximal spherical protrusion 540 of the proximal bearing 500 is fixed to the proximal shaft sleeve 510; the proximal fitting 520 has an abutting wall 402, and the abutting wall 402 abuts the proximal spherical protrusion 540 on the proximal shaft sleeve 510. Specifically, the housing 100 further comprises a fixing pin 140; the fixing pin 140 is fixed to the proximal end of the housing 100. The fixing pin 140 is provided with a fixing groove 141, and the proximal shaft sleeve 510 is installed in the fixing groove 141. It can be understood that the proximal spherical protrusion 540 is spherical, so the proximal spherical protrusion 540 has a spherical surface 501.

[0170] It can be understood that the proximal spherical protrusion 540 can be a complete ball, or can be a part containing a ball. As long as the proximal spherical protrusion 540 can form a spherical surface 501 with a proper area.

[0171] The driving device 10 is provided with a proximal end bearing 500 at the distal end of the housing 100. The proximal end bearing 500 comprises a proximal end sleeve 510, a proximal end fitting 520 and a proximal end spherical protrusion 540. The proximal end sleeve 510 is fixedly connected to the proximal end of the housing 100. The proximal end fitting 520 is located between the proximal end sleeve 510 and the stator 300 and is fixedly connected to the rotating assembly 200. The proximal end spherical protrusion 540 is fixed to one of the proximal end sleeve 510 and the proximal end fitting 520. The other one of the proximal end sleeve 510 and the proximal end fitting 520 is provided with a matching wall 502 which is axially abutted with a spherical surface 501 of the proximal end spherical protrusion 540. In this way, the proximal end sleeve 510, the proximal end fitting 520 and the proximal end spherical protrusion 540 in combination form an axial bearing. During the operation of the driving device 10, the spherical surface 501 of the proximal end spherical protrusion 540 is axially abutted with the matching wall 502, so that the rotating assembly 200 is not easily axially displaced, thereby preventing the fixed components at the proximal end of the rotating assembly 200 and the housing 100 from colliding, allowing the rotating assembly 200 to operate smoothly, reducing the risk of failure of the driving device 10 and prolonging the service life. Moreover, the contact area of the spherical surface 501 of the proximal end spherical protrusion 540 and the matching wall 502 is small. When the rotating assembly 200 rotates smoothly, the friction between the spherical surface 501 of the proximal end spherical protrusion 540 and the matching wall 502 is sliding friction, and the contact area between them is small, so the frictional resistance is small, which can reduce the power loss of the driving device 10 and further improve the efficiency of the driving device 10.

[0172] In addition, if the rotating assembly 200 is radially deflected, the spherical surface 501 of the proximal end spherical protrusion 540 and the matching wall 502 will roll relative to each other. At this time, the friction between the proximal end spherical protrusion 540 and the matching wall 502 is approximately rolling friction, and the frictional resistance is small, which can reduce the power loss of the driving device 10 and further improve the efficiency of the driving device 10.

[0173] The number of proximal end spherical protrusions 540 can be multiple. In this application, multiple means two or more than two. The multiple proximal end spherical protrusions 540 are arranged around the central axis of the rotating assembly 200. The multiple proximal end spherical protrusions 540 of the axial ball bearing collectively support the rotating assembly 200 from different directions of the outer periphery of the central axis of the rotating assembly 200, effectively preventing the rotating shaft 210 from being radially deflected, so that the rotating assembly 200 can operate smoothly.

[0174] Optionally, the multiple proximal end spherical protrusions 540 are arranged at intervals around the central axis of the rotating assembly 200. In this way, a smaller number of proximal end spherical protrusions 540 can be used. In this way, not only can the weight of the driving device 10 be reduced, so that the blood pump 1 has a lighter weight, but also the power required to start the driving device 10 can be reduced, so that the rotating assembly 200 can be started smoothly.

[0175] It can be understood that the distal end of the housing 100 (specifically the distal end sleeve 410) is provided with a distal end shaft hole 411, the rotating shaft 210 of the rotating assembly 200 passes through the distal end shaft hole 411, and an interspace is reserved between the rotating shaft 210 and the inner circumferential surface of the distal end shaft hole 411, which is used for the flushing liquid in the housing 100 to be discharged into the cannula assembly 20 of the blood pump 1 to prevent the blood from flowing back into the inside of the housing 100. Due to the existence of the interspace, the rotating shaft 210 may have a tendency of radial deflection when rotating. However, since the plurality of proximal spherical protrusions 540 collectively support the rotating assembly 200 from different directions, the risk of radial deflection of the rotating assembly 200 can be reduced, thereby reducing the occurrence of radial deflection.

[0176] Even if the rotating assembly 200 has a small radial deflection, the distal end bearing 400 will be deflected with one side of the proximal spherical protrusion 540 as the fulcrum, and the proximal spherical protrusion 540 on the other side will be slightly loose with the matching wall 502 for a short time, thereby reducing the number of proximal spherical protrusions 540 in contact with the matching wall 502, reducing the contact points of the proximal fitting 520 and the proximal sleeve 800, and further reducing the resistance of the rotating shaft 210 during deflection, avoiding the rotating shaft 210 from being stuck, and making the rotating shaft 210 easier to return to the original stable state. It is worth mentioning that since the proximal spherical protrusion 540 has a spherical surface 501, the rotating assembly 200 can be deflected in any direction around the circumference with the proximal spherical protrusion 540 as the support point.

[0177] It can be understood that the number of proximal spherical protrusions 540 can also be one. For example, in other embodiments, the proximal bearing 500 only includes one proximal spherical protrusion 540, which is movably mounted on the proximal sleeve 510; the proximal bearing 500 further includes at least one proximal ball 530 (refer to FIG. 3 to FIG. 6 ), the proximal ball 530 is fixed to the proximal sleeve 510, the proximal ball 530 and the proximal spherical protrusion 540 are arranged around the central axis of the rotating assembly 200, the proximal ball 530 and the proximal spherical protrusion 540 both have a spherical surface 501, and the spherical surfaces 501 of the two are in axial abutment with the abutment wall 402.

[0178] The proximal fitting 520 is also provided with structures such as the rotating column 522, the insertion hole 521, the limiting member 523, and the like, which are the same as those of the driving device 10 of the first embodiment. During assembly, the plurality of proximal spherical protrusions 540 between the proximal fitting 520 and the proximal sleeve 510 slide relative to the fitting wall 502, and the position of the proximal fitting 520 (i.e., the position of the rotating column 522) can also be fine-tuned, so that the rotating column 522 and the proximal sleeve 510 tend to be coaxial, and thus the difficulty of assembly of the proximal fitting 520 and the proximal sleeve 510 can be reduced. As can be seen, the proximal bearing 500 can reduce the requirement for coaxiality of the rotating shaft 210 and the proximal bearing 500 when the rotating shaft 210 is installed, thereby reducing the difficulty of assembly of the rotating shaft 210 and improving the assembly efficiency. The structure, position, and fixing manner of the proximal fitting 520 can be implemented with reference to the first embodiment, and substantially the same technical effects can also be obtained, which will not be described herein.

[0179] Since the proximal spherical protrusions 540 are fixed to the proximal sleeve 510, the proximal mounting groove 503 in the first embodiment does not need to be provided on the proximal sleeve 510. Specifically, the proximal sleeve 510 has a second end face 511; and the proximal spherical protrusions 540 are fixed to the second end face 511. The proximal spherical protrusions 540 can be integrally formed with the proximal sleeve 510. Alternatively, the proximal spherical protrusions 540 can be fixed to the proximal sleeve 510 by welding or adhesion, or the like. The proximal side end face of the proximal fitting 520 facing the proximal sleeve 510 is the fitting wall 502, which is located distally of the proximal spherical protrusions 540 and abuts against the proximal spherical protrusions 540. The other structures, positions, and fixing manners of the distal fitting 420, and the structures, positions, and fixing manners of the proximal sleeve 410 can be implemented with reference to the first to third embodiments, and substantially the same technical effects can also be obtained, which will not be described herein.

[0180] For example, the housing 100 is also provided with a fixing groove 141 arranged axially with the accommodation cavity 101. The proximal sleeve 510 is fixed in the fixing groove 141. The housing 100 is also provided with a proximal limiting groove 143 located distally of the fixing groove 141, and the proximal fitting 520 is at least partially accommodated in the proximal limiting groove 143. A gap is provided between the outer circumferential surface of the proximal fitting 520 and the inner wall surface of the proximal limiting groove 143. The gap allows the proximal fitting 520 to rotate smoothly without contacting and colliding with the inner wall surface of the proximal limiting groove 143.

[0181] It can be understood that the proximal spherical protrusion 540 has at least a part of a sphere. For example, the proximal spherical protrusion 540 can be a hemisphere, i.e. 1 / 2 of a sphere. In addition, the proximal spherical protrusion 540 can also be 1 / 3 or 1 / 4 of a sphere. The junction of the spherical surface 501 of the proximal spherical protrusion 540 and the second end surface 511 is arc-shaped transition connection.

[0182] Of course, in other embodiments, the proximal spherical protrusion 540 is fixed to the proximal fitting 520 through a cylindrical body. Specifically, the cylindrical body is upright, the bottom end of the cylindrical body is fixed to the end surface (i.e. the second end surface 521) of the proximal fitting 520, and the top end of the cylindrical body is connected to the proximal spherical protrusion 540. The diameter of the cylindrical body is equal to the diameter of the sphere in which the proximal spherical protrusion 540 is located.

[0183] As for the size, position and arrangement of the plurality of proximal spherical protrusions 540, the foregoing first to second embodiments of the outer protruding portion 532 of the proximal ball 530 can be referred to, and basically the same technical effects can be achieved. For example:

[0184] The spherical surface 501 of the proximal spherical protrusion 540 is a ceramic surface.

[0185] The diameter of the sphere in which the proximal spherical protrusion 540 is located is 0.4mm-0.7mm.

[0186] The proximal spherical protrusion 540 is radially spaced apart from the central axis (specifically the rotating column 522) of the rotating assembly 200 by a distance.

[0187] The height of the proximal spherical protrusion 540 protruding from the end surface (i.e. the second end surface 511) of the proximal shaft sleeve 510 is 0.1mm-0.2mm.

[0188] The plurality of proximal spherical protrusions 540 are arranged at equal intervals or non-equal intervals around the central axis (specifically the rotating column 522) of the rotating assembly 200.

[0189] At least one fulcrum on each of the left and right sides of the proximal spherical protrusion 540 of the rotating assembly 200 (or the front and rear rotating columns 522) can reduce the radial deflection of the rotating shaft 210 between the two sides.

[0190] The number of proximal spherical protrusions 540 can be 2-10. For example, but not limited to, 3, 4, 5, 6, 8, etc.

[0191] When there are 3 proximal spherical protrusions 540, the central axis of the rotating assembly 200 of the 3 proximal spherical protrusions 540 (specifically, the rotating column 522 or the rotating shaft 210) is arranged at equal intervals, and the vertical connection line between the center of the 3 proximal spherical protrusions 540 and the central axis of the rotating assembly 200 is Y-shaped.

[0192] When there are 4 proximal spherical protrusions 540, the central axis of the rotating assembly 200 of the 4 proximal spherical protrusions 540 (specifically, the rotating column 522 or the rotating shaft 210) is arranged at equal intervals, and the vertical connection line between the center of the 4 proximal spherical protrusions 540 and the central axis of the rotating assembly 200 forms a cross shape.

[0193] FIG. 21 and FIG. 22 This paper presents a fourth embodiment of the drive device 10 of this application. The drive device 10 in this fourth embodiment differs from the drive device 10 in the third embodiment described above in that the proximal spherical protrusion 540 is fixed to the proximal fitting 520; and the proximal bushing 510 has a mating wall 502, the mating wall 502 and the spherical surface 501 of the proximal spherical protrusion 540 abut against each other axially.

[0194] As for the size, position and arrangement of the multiple proximal spherical protrusions 540, they can be implemented with reference to the proximal spherical protrusions 540 in the aforementioned third embodiment, and will not be described in detail here.

[0195] The driving device 10 of this application also has a fifth embodiment, which can be found in [reference 1]. FIG. 3 to FIG. 13-B The structure is shown. The drive unit 10 may further include a distal bearing 400 disposed at the distal end of the housing 100; the shaft 210 passes through the distal bearing 400 and has a connecting end 211 extending out of the housing 100. The distal bearing 400 is located between the connecting end 211 and the stator 300.

[0196] See FIG. 3 to FIG. 5 The distal bearing 400 includes a distal bushing 410, a distal fitting 420, and a plurality of distal spherical members 430. The distal bushing 410 is fixed to the distal end of the housing 100. The distal fitting 420 is housed inside the housing 100, and the distal fitting 420 and the distal bushing 410 are axially opposite each other. A rotating shaft 210 rotatably passes through the distal bushing 410 and is fixedly connected to the distal fitting 420. A plurality of distal spherical members 430 are disposed on one of the distal bushing 410 and the distal fitting 420 and arranged around the rotating shaft 210. The other of the distal bushing 410 and the distal fitting 420 has an abutment wall 402, which abuts axially against the spherical surfaces 401 of the plurality of distal spherical members 430. Axial abutment means that the abutment wall 402 and the spherical surfaces 401 are axially opposite each other and abut against each other. In this application, "plural" refers to two or more.

[0197] Specifically, the plurality of distal spherical members 430 of the distal bearing 400 are arranged on the distal fitting 420; the distal sleeve 410 has the abutting wall 402 which abuts against the distal spherical members 430 on the distal fitting 420. In other embodiments, the distal spherical members 430 can also be arranged on the distal sleeve 410, and the distal fitting 420 has the abutting wall 402.

[0198] When the rotating assembly 200 has a tendency to move in the Y+ direction, the distal spherical members 430 of the distal bearing 400 and the abutting wall 402 remain abutting, so that the rotating assembly 200 cannot move in the Y+ direction, reducing the risk of axial displacement of the rotating assembly 200. It can be understood that the distal spherical members 430 can be complete spheres, or can be a part containing a sphere. Only the spherical surface 401 with a proper area on the distal spherical members 430 is required.

[0199] The driving device 10 described above is provided with a distal bearing 400 at the distal end of the housing 100, the distal bearing 400 comprising a distal fitting 420, a distal sleeve 410 and a plurality of distal spherical members 430; wherein the distal sleeve 410 is fixed to the distal end of the housing 100 and rotatably cooperates with the rotating shaft 210, the distal fitting 420 is accommodated inside the housing 100 and is fixedly connected with the rotating assembly 200; the plurality of distal spherical members 430 are movably arranged on one of the distal fitting 420 and the distal sleeve 410, and the other of the distal fitting 420 and the distal sleeve 410 has an abutting wall 402, the abutting wall 402 and the spherical surface 401 of the plurality of distal spherical members 430 abut in the axial direction. During the starting or running of the driving device 10, the distal spherical members 430 of the distal bearing 400 and the abutting wall 402 remain abutting in the axial direction, so that the rotating assembly 200 is not prone to axial displacement, thereby reducing the risk of shaking of the driving device and improving the stability of the operation of the driving assembly. Not only can the operation efficiency of the driving device be improved, but also the collision between the rotating assembly and the fixed components at the distal end of the housing can be prevented, reducing the occurrence of faults. Moreover, the plurality of distal spherical members 430 of the distal bearing 400 are arranged around the rotating shaft 210, so that the plurality of distal spherical members 430 collectively support the rotating assembly 200 from different directions of the circumference of the rotating shaft 210, which can reduce the radial deflection of the rotating assembly 200 and improve the stability of the operation of the rotating assembly 200. The contact area between the distal spherical members 430 and the abutting wall 402 is small, and the frictional resistance is small, which can improve the efficiency of the driving device 10.

[0200] In addition, in combination with the aforementioned proximal bearing 500, the plurality of proximal balls 530 (or proximal spherical protrusions 540) of the proximal bearing 500 form a plurality of support points at the proximal end of the rotating shaft 210, while the plurality of distal spherical members 430 of the distal bearing 400 form a plurality of support points at the distal end of the rotating shaft 210, such that both ends of the rotating shaft 210 are supported by a plurality of support points, so that the rotating assembly 200 is not prone to radial deflection. And, in theory, even if the rotating assembly 200 has a tendency to radial deflection, the plurality of proximal balls 530 and the plurality of distal spherical members 430 roll (or slide) in the same direction, so that both ends of the rotating shaft 210 can simultaneously move radially (i.e. the center axis of the rotating shaft 210 translates radially), without deflection, reducing the risk of the rotating shaft 210 jamming and the like.

[0201] It can be understood that, generally, an aperture is reserved between the outer circumferential surface of the rotating shaft 210 and the inner circumferential surface of the distal shaft hole 411, which is used for the flushing liquid in the housing 100 to be discharged into the cannula assembly 20 of the blood pump 1 to prevent blood from flowing back into the interior of the housing 100. Due to the existence of the aperture, the rotating shaft 210 may

[0202] The plurality of distal spherical members 430 can all be movable balls. Alternatively, in other embodiments, the plurality of distal spherical members 430 are all fixed spherical protrusions. Of course, in still other embodiments, some of the plurality of distal spherical members 430 are movable balls, while others are fixed spherical protrusions. In the present embodiment, the plurality of distal spherical members 430 are all balls.

[0203] It can be understood that the distal spherical member 430 can be a movable ball or a fixed spherical protrusion. When the distal spherical member 430 is a movable ball, the entire outer circumferential surface of the distal spherical member 430 is a spherical surface 601. When the distal spherical member 430 is a fixed spherical protrusion, the distal spherical member 430 is at least a part of a sphere, so that at least a part of the outer surface of the distal spherical member 430 is a spherical surface 601.

[0204] In the embodiment, the plurality of distal spherical members 430 are balls. Thus, the distal bearing 400 formed by the combination of the distal shaft sleeve 410, the distal fitting 420 and the distal spherical members 430 is an axial ball bearing. The friction between the distal spherical members 430 and the abutting wall 402 in the axial ball bearing is rolling friction, which has small friction resistance and can improve the efficiency of the driving device 10.

[0205] Since the shaft 210 is rotatably arranged through the distal shaft sleeve 410, the distal shaft sleeve 410 should be provided with a shaft hole through which the shaft 210 passes. Specifically, the distal shaft sleeve 410 is provided with a distal shaft hole 411, and the distal shaft hole 411 is rotatably arranged through the distal shaft hole 411. Moreover, the shaft 210 passes through the distal shaft hole 411 and has a connecting end 211 extending to the outside of the shell 210. The distal shaft sleeve 410 is in sliding fit with the outer circumferential surface of the shaft 210 through the inner circumferential surface of the distal shaft hole 411, so that the distal shaft sleeve 410 and the outer circumferential surface of the shaft 210 combine to form a radial sliding bearing, which can limit the radial movement of the shaft 210 and reduce the situation that the shaft 210 occurs radial deflection. That is, the distal bearing can form an axial ball bearing by the combination of the distal shaft sleeve 410, the distal fitting 420 and the distal spherical members 430 to limit the axial movement of the shaft 210, and also form a radial sliding bearing by the combination of the inner circumferential surface of the distal shaft sleeve 410 and the outer circumferential surface of the shaft 210 to limit the radial movement of the shaft 210. The axial ball bearing and the radial sliding bearing cooperate with each other to enable the shaft 210 to rotate stably, improve the coaxiality of the central axis of the shaft 210 and the central axis 11 of the shell 100 during the operation of the shaft 210, and thus reduce the collision between the shaft 210 and the shell 100 and other components, effectively reduce the risk of failure of the driving device 10.

[0206] It should be noted that when the shaft 210 rotates stably, the central axis of the shaft 210 coincides with the central axis 11 of the shell 100. If the shaft 210 occurs small-amplitude radial deflection, the central axis of the shaft 210 intersects the central axis 11 of the shell 100.

[0207] The distal bearing 400 is located between the connecting end 211 and the stator 300 or the rotor 220. In other words, the distal bearing 400 is arranged between the connecting end 211 and the stator 300, or the distal bearing 400 is arranged between the connecting end 211 and the rotor 220. The distal fitting 420 of the distal bearing 400 can be fixedly connected with the rotating shaft 210 or the rotor 220.

[0208] Specifically, the distal bearing 400 is arranged between the connecting end 211 and the first rotor 221. The distal fitting 420 of the distal bearing 400 is fixedly connected with the rotating shaft 210 and the first rotor 221. When the stator 300 drives the rotor 220 to rotate, the rotor 220 drives the rotating shaft 210 to rotate, and the distal fitting 420 rotates together with the rotating shaft 210, so that the distal fitting 420 rotates relative to the distal bearing sleeve 410. In this process, the distal spherical part 430 can roll relative to the abutting wall 402.

[0209] Referring to FIG. 3 to FIG. 5 For the distal bearing sleeve 410, the distal bearing sleeve 410 is an independent component, which can be connected and fixed with the shell 100 by bonding, welding or the like. Alternatively, the distal end of the shell 100 is provided with a mounting hole 103, and the mounting hole 103 and the receiving cavity 101 are arranged along the axial direction; the mounting hole 103 is located at the distal side of the receiving cavity 101, and the distal bearing sleeve 410 is mounted in the mounting hole 103. Of course, in other embodiments, the distal bearing sleeve 410 can be a component integrally formed with the shell 100.

[0210] The distal bearing sleeve 410 is arranged in a cylindrical shape. Of course, in other embodiments, the distal bearing sleeve 410 can also have other shapes. The proximal end surface of the distal bearing sleeve 410 faces the receiving cavity 101, and the proximal end surface of the distal bearing sleeve 410 serves as the abutting wall 402.

[0211] The distal fitting 420 is received in the receiving cavity 101 of the shell 100. The distal wall of the distal fitting 420 is the first end surface 421, and the distal spherical part 430 of the distal fitting 420 protrudes towards the distal bearing sleeve 410 relative to the first end surface 421 to abut against the abutting wall 402. The distal fitting 420 is at least connected and fixed with one of the rotating shaft 210 and the rotor 220.

[0212] The distal fitting 420 is arranged in a disc-shaped structure. The distal fitting 420 is integrally formed with the rotating shaft 210. The distal fitting 420 can be integrally formed with the rotating shaft 210, which can improve the firmness of the connection between the distal fitting 420 and the rotating shaft 210, and can also reduce the processing procedures. Of course, in other embodiments, the distal fitting 420 can be an independent component, i.e. the distal fitting 420 is separately formed with the rotating shaft 210, and the distal fitting 420 can be connected and fixed with the rotating shaft 210 by welding or bonding.

[0213] Since the first rotor 221 is adjacent to the distal accessory 420, the first rotor 221 has a distal face facing the distal accessory 420, so the distal accessory 420 can also be fixedly connected with the distal face of the first rotor 221.

[0214] Referring to FIG. 3 and FIG. 4 Optionally, the outer diameter of the distal accessory 420 is smaller than the outer diameter of the first rotor 221. Defining the outer diameter of the distal accessory 420 as a first outer diameter D1 and the outer diameter of the first rotor 221 as a second outer diameter D2, then D1 < D2. The larger the outer diameter of the rotor 220 is, the larger the volume of the magnet that the rotor 220 can accommodate is, and the larger the magnetic force of the rotor 220 is. Therefore, the outer diameter of the first rotor 221 (i.e. the second outer diameter D2) is designed to be larger, so as to increase the magnetic force of the first rotor 221, thereby improving the efficiency of the driving device 10. The outer diameter of the distal accessory 420 is smaller, so that the volume of the distal accessory 420 is smaller, effectively reducing the weight and space occupied by the distal accessory 420.

[0215] In addition, since the outer diameter of the first rotor 221 is larger than the outer diameter of the distal accessory 420, the area of the distal face of the first rotor 221 is larger than the area of the proximal face of the distal accessory 420, so that the distal face of the first rotor 221 can stably support the distal accessory 420, thereby enhancing the stability of the installation of the distal accessory 420.

[0216] Referring to FIG. 3 , FIG. 4 and FIG. 6 The housing 100 further comprises a distal limiting groove 102 located between the accommodation cavity 101 and the mounting hole 103. The diameter of the distal limiting groove 102 is smaller than the diameter of the accommodation cavity 101, and the diameter of the distal limiting groove 102 is larger than the diameter of the mounting hole 103. The distal portion of the distal accessory 420 extends into the distal limiting groove 102, so as to limit the rotation of the distal accessory 420 in the distal limiting groove 102.

[0217] It can be understood that since the distal accessory 420 is fixedly connected with the shaft 210, the distal accessory 420 can rotate with the shaft 210, so the diameter of the distal limiting groove 102 should be larger than the outer diameter of the distal accessory 420 (i.e. the first outer diameter), so as to ensure that there is a gap between the inner circumferential wall of the distal limiting groove 102 and the outer circumferential surface of the distal accessory 420, for the rotation of the distal accessory 420. When the deflection amplitude of the shaft 210, i.e. the deflection amplitude of the shaft 210 is limited, the deflection amplitude of the shaft 210 is avoided. When the shaft 210 has a tendency to have a large radial deflection, the distal limiting groove 102 can limit the rotation of the distal accessory 420

[0218] The distal end of the distal accessory 420 extends into the distal limiting groove 102, that is, the first end face 421 of the distal accessory 420 extends into the distal limiting groove 102. Since the diameter of the distal limiting groove 102 is larger than the diameter of the mounting hole 103, a stepped surface is formed between the distal limiting groove 102 and the mounting hole 103. During assembly, if the distal accessory 420 (specifically the first end face 421) contacts the stepped surface before the distal spherical part 430 contacts the abutment wall 402, then the stepped surface will prevent the distal spherical part 430 from contacting the abutment wall 402, making it difficult for the distal spherical part 430 to subsequently abut against the abutment wall 402.

[0219] In view of the above, in this embodiment, when the distal spherical part 430 on the distal fitting 420 abuts against the abutment wall 402 of the distal bushing 410, the distal fitting 420 and the stepped surface are axially spaced by a first distance L1. Specifically, the first end face 421 of a fitting 500 is spaced by a first distance L1 from the stepped surface. The first distance L1 is greater than zero. This design prevents the distal fitting 420 from contacting the stepped surface before the distal spherical part 430 contacts the abutment wall 402, ensuring that the distal spherical part 430 can accurately contact the abutment wall 402.

[0220] See FIG. 4 to FIG. 6 For the distal spherical member 430, the distal spherical member 430 is movably mounted on the distal fitting 420, and a portion of the distal spherical member 430 protrudes from the first end face 421, that is, a portion of the distal spherical member 430 is located between the first end face 421 and the abutment wall 402 to abut against the abutment wall 402.

[0221] Specifically, the distal accessory 420 is provided with a distal mounting groove 403, which has an opening 403c. A distal spherical member 430 is correspondingly mounted in the distal mounting groove 403. A portion of the distal spherical member 430 extends outward from the opening 403c of the distal mounting groove 403, such that the distal spherical member 430 has an inner portion 432 received inside the distal mounting groove 403 and an outer protrusion 431 extending outside the distal mounting groove 403. The spherical surface 401 on the outer protrusion 431 abuts against the abutment wall 402.

[0222] In this embodiment, since the distal spherical member 430 is a movable ball, the entire outer peripheral surface of the distal spherical member 430 is spherical. Therefore, no matter which direction the distal spherical member 430 rolls or which position it rolls to, the distal spherical member 430 will always have an outward protrusion 431 located outside the distal mounting groove 403, so that the spherical surface 601 on the outward protrusion 431 can abut against the abutment wall 401.

[0223] Optionally, in one of the installation modes of the distal spherical members 430, the distal fitting 420 is provided with a plurality of distal installation slots 403, and at least one distal spherical member 430 is installed in each of the distal installation slots 403. Specifically, in this embodiment, one distal installation slot 403 is provided with one distal spherical member 430. In other embodiments, each distal installation slot 403 can be provided with at least two distal spherical members 430.

[0224] Since the plurality of distal spherical members 430 are installed in different distal installation slots 403, the distal spherical members 430 in one distal installation slot 403 do not interfere with the distal spherical members 430 in other distal installation slots 403. When the rotating assembly 200 rotates, the plurality of distal spherical members 430 are driven by the rotating assembly 200 to roll in their respective distal installation slots 403, and the distal spherical members 430 in any adjacent distal installation slots 403 do not push each other, so that each distal spherical member 430 can freely roll. Therefore, the distal spherical members 430 at different positions can adaptively move according to the size and direction of the force acting on them. When the driving device 10 starts, the driving device 10 has a small starting power, and the rotating assembly 200 starts to run more smoothly.

[0225] In another installation mode of the distal spherical members 430, the distal fitting 420 can be provided with only one distal installation slot 403, which is annular and surrounds the rotating shaft 210. A plurality of distal spherical members 430 are arranged in the distal installation slot 403 and are sequentially adjacent around the rotating shaft 210. The two adjacent distal spherical members 430 are in contact. The spherical surface 401 of the distal spherical member 430 is also in contact with the peripheral surface of the rotating shaft 210. Specifically, the distal installation slot 403 has a slot bottom wall 403a and a slot side wall 403b provided along the outer periphery of the slot bottom wall 403a, that is, the distal installation slot 403 has only one slot side wall 403b, the slot side wall 403b and the peripheral surface of the rotating shaft 210 are radially spaced, and the distal spherical member 430 is tangent to the slot side wall 403b and the peripheral surface of the rotating shaft 210.

[0226] Referring to FIG. 4 to FIG. 6 , no matter which installation mode is adopted by the distal spherical members 430, the outer convex portion 431 of the distal spherical member 430 has an abutting point F1 for abutting against the abutting wall 402. Here, the abutting point F1 of the distal spherical member 430 is tangent to the abutting wall 402. The distal spherical member 430 has an axial height H f1 from the slot opening 403c of the distal installation slot 403 to the outer convex portion 431, which is the axial distance between the abutting point F1 and the slot opening 403c, and is also the axial distance between the first end face 421 and the abutting wall 402. f1

[0227] If the axial height H​f1 If the axial height H is too small, the distance between the first end face 421 and the abutting wall 402 is small, and the two are likely to contact each other, causing wear or collision between the first end face 421 and the abutting wall 402 when the rotating shaft 210 rotates. Therefore, the axial height H is optionally greater than or equal to 1 / 3 of the radius of the distal spherical part 430, i.e., H > 1 / 3R, where R represents the radius of the distal spherical part 430. In this way, after the outer convex part 431 abuts against the abutting wall 402, the first end face 421 and the abutting wall 402 are spaced apart by a sufficient distance, and the two are less likely to contact each other, avoiding wear or collision between the two, and improving the stability of the rotating shaft 210. f1 H > 1 / 3R, where R represents the radius of the distal spherical part 430. In this way, after the outer convex part 431 abuts against the abutting wall 402, the first end face 421 and the abutting wall 402 are spaced apart by a sufficient distance, and the two are less likely to contact each other, avoiding wear or collision between the two, and improving the stability of the rotating shaft 210. f1 H > 1 / 3R, where R represents the radius of the distal spherical part 430. In this way, after the outer convex part 431 abuts against the abutting wall 402, the first end face 421 and the abutting wall 402 are spaced apart by a sufficient distance, and the two are less likely to contact each other, avoiding wear or collision between the two, and improving the stability of the rotating shaft 210.

[0228] H > 1 / 3R, where R represents the radius of the distal spherical part 430. In this way, after the outer convex part 431 abuts against the abutting wall 402, the first end face 421 and the abutting wall 402 are spaced apart by a sufficient distance, and the two are less likely to contact each other, avoiding wear or collision between the two, and improving the stability of the rotating shaft 210. f1 H > 1 / 3R, where R represents the radius of the distal spherical part 430. In this way, after the outer convex part 431 abuts against the abutting wall 402, the first end face 421 and the abutting wall 402 are spaced apart by a sufficient distance, and the two are less likely to contact each other, avoiding wear or collision between the two, and improving the stability of the rotating shaft 210. f1 H > 1 / 3R, where R represents the radius of the distal spherical part 430. In this way, after the outer convex part 431 abuts against the abutting wall 402, the first end face 421 and the abutting wall 402 are spaced apart by a sufficient distance, and the two are less likely to contact each other, avoiding wear or collision between the two, and improving the stability of the rotating shaft 210. f1 H > 1 / 3R, where R represents the radius of the distal spherical part 430. In this way, after the outer convex part 431 abuts against the abutting wall 402, the first end face 421 and the abutting wall 402 are spaced apart by a sufficient distance, and the two are less likely to contact each other, avoiding wear or collision between the two, and improving the stability of the rotating shaft 210.

[0229] Referring to FIG. 4 to FIG. 6 , the distal mounting groove 403 has a groove bottom wall 403a and a groove side wall 403b arranged along the circumference of the groove bottom wall 403a; the built-in part 432 of the distal spherical part 430 abuts against the groove bottom wall 403a, and the built-in part 432 of the distal spherical part 430 also tangentially contacts the groove side wall 403b.

[0230] The groove bottom wall 403a is a plane wall perpendicular to the central axis of the distal fitting 420. At this time, the distal spherical part 430 tangentially contacts the groove bottom wall 403a, and the tangential position is the abutting position. In other embodiments, the groove bottom wall 403a can be a spherical wall.

[0231] The groove side wall 403b is perpendicular to the groove bottom wall 403a. The groove side wall 403b can be a cylindrical surface, and the contact between the distal spherical part 430 and the groove side wall 403b is linear contact. The groove side wall 403b can also be composed of multiple planes, and the contact between the distal spherical part 430 and the groove side wall 403b is point contact. In other embodiments, the groove side wall 403b can form an inclined angle with the groove bottom wall 403a.

[0232] A tangential position of the built-in portion 432 of the distal spherical member 430 to the slot sidewall 403b is defined as a tangential position F2, and the tangential position F2 has a tangential depth Hf2 to the slot opening 403c of the distal mounting slot 403 f2 . Obviously, the tangential depth Hf2 f2 needs to be less than the radius R of the distal spherical member 430 (i.e. Hf2 f2 < R, R = ½D f ) so that a portion of the distal spherical member 430 protrudes outwardly from the slot opening 403c of the distal mounting slot 403 to form an outward protruding portion 431. However, the tangential depth Hf2 f2 should not be too small, otherwise the distal spherical member 430 is prone to fall out of the distal mounting slot 403.

[0233] Therefore, optionally, the tangential depth Hf2 is greater than or equal to ½ times the radius of the distal spherical member 430, i.e. ½R ≤ Hf2 f2 < R. In this way, the volume of the built-in portion 432 of the distal spherical member 430 is greater than or equal to half of the volume of the distal spherical member 430. With this arrangement, the center of the distal spherical member 430 falls inside the distal mounting slot 403, thereby reducing the risk of the distal spherical member 430 falling out of the distal mounting slot 403.

[0234] It can be understood that the tangential depth Hf2 f2 and the axial height Hf3 f1 together equal the radius R of the distal spherical member 430, i.e. Hf2 f1 + Hf3 f2 = R. Further, the tangential depth Hf2 f2 is also greater than the axial height Hf3 f1 , so that ½R ≤ Hf2 f1 < Hf3 f2 < R. With this arrangement, it can be ensured that the distal spherical member 430 is not prone to fall out of the distal mounting slot 403, and the outward protruding portion 431 of the distal spherical member 430 has sufficient height to abut against the abutment wall 402.

[0235] Referring to FIG. 3 , FIG. 9 and FIG. 10 , the plurality of distal spherical members 430 are arranged at intervals around the rotation shaft 210, which can be equidistantly arranged or non-equidistantly arranged. The rotation shaft 210 has an annular region 102 defined by an inner circle and an outer circle. It should be noted that the inner circle and the outer circle are virtual boundaries for defining the annular region 102, and the inner circle is located between the outer circle and the outer circumferential surface of the rotation shaft 210. The centers of the inner circle and the outer circle are located on the central axis of the rotation shaft 210. The inner circle and the outer circumferential surface of the rotation shaft 210 are radially spaced apart by a distance. The plurality of distal spherical members 430 are arranged in the annular region 102.

[0236] Multiple distal spherical components 430 may be arranged at equal intervals or at non-equal intervals in the annular region 102. At least two of the distal spherical components 430 are located on opposite sides of the rotating shaft 210. This allows for at least one fulcrum on each opposite side of the rotating shaft 210 (such as the left and right sides or the front and back sides), thereby reducing radial sway of the rotating shaft 210 along the left and right sides.

[0237] The number of distal spherical components 430 can be 2 to 10. For example, but not limited to, 3, 4, 5, 8, etc. As shown in Figure 12, the number of distal spherical components 430 can be selected as 3. These 3 distal spherical components 430a to 430c are arranged at equal intervals along the outer circumference of the rotating shaft 210, and the perpendicular connection line between the center of the 3 distal spherical components 430a to 430c and the central axis of the rotating shaft 210 forms a Y-shape. As shown in Figure 13, the number of distal spherical components 430 can also be selected as 4. These 4 distal spherical components 430a to 430d are arranged at equal intervals along the outer circumference of the rotating shaft 210, and the perpendicular connection line between the center of the 4 distal spherical components 430a to 430d and the central axis of the rotating shaft 210 forms a cross shape.

[0238] Referring to Figure 11, the diameter D of the distal spherical component 430 f The value is 0.4mm to 0.7mm, that is, 0.4mm ≤ D. f ≤0.7mm. The radius R of the distal spherical component 430 is D. f Half of. For example, diameter D f The values ​​can be, but are not limited to, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, and 0.7mm.

[0239] The outer surface of the distal spherical component 430 can be a ceramic surface. Specifically, the distal spherical component 430 is entirely made of ceramic material, thus making its outer surface a ceramic surface. Alternatively, in other embodiments, the distal spherical component 430 can be made of a hard metal material, with an additional layer of ceramic material added to its outer surface to form the ceramic surface. Ceramic materials offer high processing precision, high biocompatibility, high mechanical strength, and good wear and corrosion resistance.

[0240] See FIG. 4 and FIG. 14For the abutting wall 402 abutting against the distal spherical part 430, the abutting wall 402 can be provided as a flat wall without concave-convex structure. The abutting wall 402 is perpendicular to the central axis of the rotating shaft 210, so that the abutting wall 402 is tangent to the distal spherical part 430. In this way, the distal spherical part 430 can keep stable contact and relative rolling with the abutting wall 402 during rotation of the rotating assembly 200. In this way, each distal spherical part 430 is tangent to the abutting wall 402, so that the contact between the distal spherical parts 430 and the abutting wall 402 is point contact of multiple scattered points, the contact area is small, and the frictional resistance is small. Moreover, if the rotating shaft 210 occurs radial deflection, the distal spherical part 430 can roll radially on the abutting wall 402, reduce the resistance to the movement of the distal spherical part 430, avoid the rotating shaft 210 from being stuck, and make the rotating shaft 210 easier to restore to the original stable state.

[0241] In the embodiment, since the distal shaft sleeve 410 is provided with the abutting wall 402, the distal shaft hole 411 on the distal shaft sleeve 410 penetrates through the abutting wall 402. The connection between the inner circumferential surface of the distal shaft hole 411 and the abutting wall 402 is the inner end hole edge of the distal shaft hole 411. The abutting point F1 of any one distal spherical part 430 and the distal shaft hole 411 are radially spaced. The minimum radial distance between the abutting point F1 and the distal shaft hole 411 is defined as the second distance L2. When the rotating shaft 210 occurs small-amplitude radial deflection, the second distance L2 of the distal spherical part 430 on one side will decrease. When the second distance L2 on one side decreases, the distal spherical part 430 can contact the inner end hole edge of the distal shaft hole 411, and a large friction will occur when the two contact.

[0242] Therefore, in the embodiment, the second distance L2 is greater than or equal to 0.2 mm, that is, L2≥0.2 mm. In this way, when the rotating shaft 210 occurs small-amplitude radial deflection, the possibility that the distal spherical part 430 contacts the inner end hole edge of the distal shaft hole 411 can be reduced, and in turn the abrasion of the distal spherical part 430 can be reduced. The maximum value of the second distance L2 is not limited, and can be designed according to the diameter of the distal shaft sleeve 410.

[0243] The abutting wall 402 can also be provided as a ceramic surface. Specifically, the distal shaft sleeve 410 is made of ceramic material as a whole, so that the abutting wall 402 of the distal shaft sleeve 410 becomes a ceramic surface. Of course, in other embodiments, the distal shaft sleeve 410 can be made of hard metal material, and a layer of ceramic material is added to the surface of the distal shaft sleeve 410 to form the ceramic surface.

[0244] Of course, in other embodiments, the abutting wall 402 can also be provided with an annular groove (such as the annular groove 504 described above), so that a part of the distal spherical part 430 is accommodated in the annular groove.

[0245] FIG. 23 to FIG. 25-B A sixth embodiment of the driving device 10 of the present application is shown. The sixth embodiment differs from the fifth embodiment described above in that the plurality of distal spherical members 430 of the distal bearing 400 are not movable balls but fixed spherical protrusions. Specifically, the distal spherical members 430 are spherical protrusions fixed on one of the distal sleeve 410 and the distal fitting 420, and the other of the distal sleeve 410 and the distal fitting 420 has an abutting wall 402 abutting the spherical surface 401 of the distal spherical member 430 in the axial direction.

[0246] Specifically, the distal spherical members 430 are fixed to the distal fitting 420, and the spherical surface 401 of the distal spherical member 430 abuts the abutting wall 402. Since the distal spherical members 430 are fixed to the distal fitting 420, it is not necessary to provide the distal mounting groove 403 on the distal fitting 420 as in the fifth embodiment. The distal spherical members 430 can be integrally formed with the distal fitting 420. Alternatively, the distal spherical members 430 are fixed to the distal fitting 420 by welding or adhesion, etc. The distal fitting 420 has a first end surface 421, and the distal spherical members 430 are fixed to the first end surface 421.

[0247] It can be understood that the distal spherical members 430 can be complete spheres or a part of a sphere, as long as the outer surface of the distal spherical members 430 has at least partially a spherical surface 401. The axial height H of the distal spherical members 430 protruding from the end surface (i.e. the first end surface 421) of the distal fitting 420 f1 may be 0.1mm to 0.2mm. The distal spherical members 430 can be hemispheres, i.e. 1 / 2 of a sphere. Of course, in other embodiments, the distal spherical members 430 can also be 1 / 3 or 1 / 4 of a sphere. The connection between the spherical surface 401 of the distal spherical members 430 and the first end surface 421 is in the form of an arc-shaped transition.

[0248] The size, position and arrangement of the distal spherical members 430 can be implemented as the outer protrusion 522 when the distal spherical members 430 are balls in the fifth embodiment described above, and substantially the same technical effects can be achieved. Such as:

[0249] The distal spherical members 430 are radially spaced from the outer circumferential surface of the rotating shaft 210.

[0250] The spherical surface 401 of the distal spherical members 430 is a ceramic surface.

[0251] The diameter of the sphere of which the distal spherical members 430 are a part is 0.4mm to 0.7mm.

[0252] The height of the distal spherical members 430 protruding from the end surface of the distal fitting 420 is 0.1mm to 0.2mm.

[0253] The plurality of distal spherical members 430 are arranged equidistantly along the outer circumference of the rotating shaft 210.

[0254] At least two of the distal spherical members 430 are located on opposite sides of the rotating shaft 210.

[0255] Any combination of the above-described technical features of the embodiments can be made. In order to make the description simple, all possible combinations of the technical features in the above-described embodiments are not described, however, as long as the combination of the technical features does not exist, it should be considered as the scope of the description.

[0256] The above-described embodiments only express several implementation manners of the present application, the description is more specific and detailed, but it should not be understood as a limitation on the patent scope of the application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A driving device, characterized in that, The driving device includes: case; A rotating assembly, which is rotatably mounted on the housing; Stator, the stator being fixedly connected to the housing; and The proximal bearing includes a proximal bushing, a proximal fitting, and proximal balls; wherein, The proximal bushing is fixed to the proximal end of the housing; The proximal fitting is located between the proximal bushing and the stator. The proximal fitting is axially opposite to the proximal bushing and can rotate relative to the proximal bushing. The proximal fitting is fixedly connected to the rotating assembly. The proximal ball is movably mounted on one of the proximal bushing and the proximal fitting, the other of the proximal bushing and the proximal fitting having a mating wall that abuts against the spherical surface of the proximal ball in the axial direction; The rotating assembly includes a rotating shaft and a rotor fixedly connected to the rotating shaft, and the stator is capable of driving the rotor to rotate; the distal end of the proximal fitting is fixedly connected to the proximal end of the rotating shaft; the proximal end of the proximal fitting is provided with a rotating column, the rotating column is coaxial with the rotating shaft, and the rotating column rotatably passes through the proximal bushing. The distal end of the proximal accessory is provided with a socket, and the proximal end of the rotating shaft is fixed in the socket; there are multiple proximal balls, and the multiple proximal balls are arranged around the rotating column.

2. The driving device according to claim 1, characterized in that, Multiple proximal balls are arranged at equal intervals around the central axis of the rotating assembly.

3. The driving device according to claim 1, characterized in that, The insertion hole is a blind hole and has a bottom wall; the proximal end of the rotating shaft is the mounting end, which is fixed in the insertion hole, and the end face of the mounting end abuts against the bottom wall.

4. The driving device according to claim 2, characterized in that, The proximal bushing is provided with a proximal shaft hole, and the rotating column rotatably passes through the proximal shaft hole. A limiting member is provided on the circumferential surface of the proximal end of the rotating column. The limiting member is located on the side of the proximal bushing opposite to the proximal fitting and can abut against the proximal bushing axially.

5. The driving device according to claim 1, characterized in that, The near end of the housing is provided with a fixing groove for mounting the near end bushing, and a near-side limiting groove located far from the fixing groove; the near end fitting is at least partially housed in the near-side limiting groove, and there is a gap between the outer peripheral surface of the near end fitting and the inner peripheral surface of the near-side limiting groove.

6. The driving device according to any one of claims 1 to 5, characterized in that, One of the proximal bushing and the proximal fitting is provided with a proximal mounting groove, and at least one proximal ball is installed in the proximal mounting groove. A portion of the proximal ball extends outward from the opening of the proximal mounting groove to abut against the mating wall.

7. The driving device according to claim 6, characterized in that, The number of proximal mounting slots is multiple, and the multiple proximal mounting slots are arranged at intervals around the rotating shaft. Each proximal mounting slot is provided with at least one proximal ball. Alternatively, the number of proximal mounting slots is one, the proximal mounting slot is arranged in a ring around the rotating component, and a plurality of proximal balls are provided in the proximal mounting slot, the plurality of proximal balls being arranged around the rotating component.

8. The driving device according to claim 6, characterized in that, The proximal mounting groove has a bottom wall and a side wall; the proximal ball abuts against the bottom wall and is tangent to the side wall, with a tangent depth between the tangent and the groove opening of the proximal mounting groove being greater than or equal to 1 / 2 times the radius of the proximal ball and less than the radius of the proximal ball. Alternatively, the proximal ball has an axial height protruding outward from the opening of the proximal mounting groove, the axial height being greater than or equal to 1 / 3 times the radius of the proximal ball and less than the radius of the proximal ball.

9. The driving device according to any one of claims 1, 3 to 5, characterized in that, The proximal bearing also has at least one of the following characteristics: The spherical surface of the proximal ball is a ceramic surface; The diameter of the proximal ball is 0.4mm~0.7mm; The proximal ball and the rotating column provided on the proximal fitting are radially spaced by a distance; The proximal balls are arranged at intervals around the central axis of the rotating assembly; At least two of the proximal balls are located on opposite sides of the central axis of the rotating assembly.

10. The driving device according to any one of claims 1 to 5, characterized in that, The mating wall is provided with an annular groove, which surrounds the central axis of the rotating assembly; a portion of the proximal ball is housed within the annular groove.

11. The driving device according to claim 10, characterized in that, The annular groove has an annular bottom wall and annular side walls located on both sides of the annular bottom wall; the annular groove also has at least one of the following features: The bottom wall of the ring is perpendicular to the central axis of the rotating assembly and tangent to the spherical surface of the proximal ball; The ring sidewall is configured as a concave arc shape; The annular groove has a rounded wall at its opening; The radial width of the annular groove gradually decreases along the direction from the proximal bushing to the proximal fitting.

12. The driving device according to any one of claims 1 to 5, characterized in that, The mating wall is a flat wall without an uneven structure, and the mating wall also has at least one of the following characteristics: The mating wall is perpendicular to the central axis of the rotating assembly and tangent to the proximal ball; The mating wall is a ceramic surface.

13. The driving device according to any one of claims 1 to 5, characterized in that, The rotating assembly includes a rotating shaft; the driving device further includes a distal bearing, the distal bearing comprising: A distal bushing, the distal bushing being fixed to the distal end of the housing, and the rotating shaft rotatably passing through the distal bushing; The remote accessory, housed within the housing and fixedly connected to the rotating assembly; and A plurality of distal spherical components are disposed on one of the distal bushing and the distal fitting and arranged around the pivot; the other of the distal bushing and the distal fitting has an abutment wall that abuts against the spherical surface of the distal spherical component axially.

14. A driving device, characterized in that, The driving device includes: case; A rotating assembly, which is rotatably mounted on the housing; A stator, fixedly connected to the housing and capable of driving the rotating assembly to rotate; and, The proximal bearing includes a proximal bushing, a proximal fitting, and a proximal spherical protrusion; wherein... The proximal bushing is fixed to the proximal end of the housing; The proximal fitting is located between the proximal bushing and the stator. The proximal fitting is axially opposite to the proximal bushing and can rotate relative to the proximal bushing. The proximal fitting is fixedly connected to the rotating assembly. The proximal spherical protrusion is fixed to one of the proximal bushing and the proximal fitting, and the other of the proximal bushing and the proximal fitting has a mating wall that abuts against the spherical surface of the proximal spherical protrusion axially. The rotating assembly includes a rotating shaft and a rotor fixedly connected to the rotating shaft. The distal end of the proximal fitting is fixedly connected to the proximal end of the rotating shaft. The proximal end of the proximal fitting is provided with a rotating column, which is coaxial with the rotating shaft and rotatably passes through the proximal bushing. The distal end of the proximal accessory is provided with a socket for fixing the proximal end of the rotating shaft; The number of proximal spherical protrusions is multiple, and the multiple proximal spherical protrusions are arranged around the rotating column.

15. The driving device according to claim 14, characterized in that, Multiple proximal spherical protrusions are arranged at equal intervals around the rotating column.

16. The driving device according to claim 15, characterized in that, The proximal bushing is provided with a proximal shaft hole, through which the rotating column rotatably passes; the proximal end of the rotating column is located on the side of the proximal bushing opposite to the proximal fitting, and a limiting member is provided on the circumferential surface of the proximal end of the rotating column, which can abut against the proximal bushing along the axial direction.

17. The driving device according to any one of claims 14 to 16, characterized in that, The mating wall is provided with an annular groove, which surrounds the outer periphery of the central axis of the rotating assembly; a portion of the proximal spherical protrusion is received within the annular groove.

18. The driving device according to claim 17, characterized in that, The annular groove has an annular bottom wall and annular side walls located on both sides of the annular bottom wall; the annular groove also has at least one of the following features: The bottom wall of the ring is perpendicular to the central axis of the rotating assembly and tangent to the outer convex portion of the proximal spherical protrusion; The ring sidewall is configured as a concave arc shape; The annular groove has a rounded wall at its opening; The radial width of the annular groove gradually decreases along the direction from the proximal bushing to the proximal fitting.

19. The driving device according to claim 14, characterized in that, The proximal bearing also has at least one of the following characteristics: The spherical surface of the proximal spherical protrusion is a ceramic surface; The diameter of the proximal spherical protrusion is 0.4 mm to 0.7 mm; The proximal spherical protrusion and the rotating column provided on the proximal fitting are radially spaced by a distance; The plurality of proximal spherical protrusions are arranged at intervals around the central axis of the rotating assembly; At least two of the proximal spherical protrusions are located on opposite sides of the central axis of the rotating assembly.

20. The driving device according to any one of claims 14 to 16, characterized in that, The proximal bearing also has at least one of the following characteristics: The mating wall is perpendicular to the central axis of the rotating assembly and is tangent to the spherical surface of the proximal spherical protrusion; The mating wall is a flat surface without any concave or convex structure; The mating wall is a ceramic surface.

21. The driving device according to any one of claims 14 to 16, characterized in that, The rotating assembly includes a rotating shaft; the driving device further includes a distal bearing, the distal bearing comprising: A distal bushing, fixed to the distal end of the housing, through which the rotating shaft rotatably passes. The remote accessory, housed within the housing and fixedly connected to the rotating assembly; and A plurality of distal spherical components are disposed on one of the distal bushing and the distal fitting and arranged around the pivot; the other of the distal bushing and the distal fitting has an abutment wall that abuts against the spherical surface of the distal spherical component axially.

22. A blood pump, characterized in that, The blood pump includes an impeller and a drive device as described in any one of claims 1 to 21, wherein the impeller is fixedly connected to the distal end of the shaft of the drive device.

23. The blood pump according to claim 22, characterized in that, The blood pump also includes a cannula assembly, which is fixedly connected to the housing of the drive device; the proximal end of the cannula assembly has a proximal opening, and the distal end of the cannula assembly has a distal opening, one of which is a blood inlet and the other is a blood outlet; the impeller is disposed inside the cannula assembly.

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