Drive mechanism and blood pump

Abstract

The application relates to a driving mechanism and a blood pump, the driving mechanism comprising a shell, a rotating part, a first shaft sleeve, a second shaft sleeve and a stop piece, the rotating part being rotatably installed on the shell and having a taper head end; the first shaft sleeve is provided with a first shaft hole having a taper hole part, the rotating part is rotatably arranged in the second shaft sleeve, at least part of the taper head end is movably arranged in the first shaft hole, and the taper head end can abut against the hole wall of the taper hole part; the stop piece is fixedly connected to the rotating part, the stop piece is located between the first shaft sleeve and the second shaft sleeve, and the stop piece can abut against the second shaft sleeve. The driving mechanism and the blood pump have a simpler structure.

Description

TECHNICAL FIELD

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

[0002] The blood pump is designed to be inserted into the blood vessel of a patient percutaneously, for example, into the blood vessel of the artery or vein of the thigh or armpit, and can be probed into the heart of the patient to function as a left ventricular assist device or a right ventricular assist device. Therefore, the blood pump can also be referred to as an intracardiac blood pump or an intravascular blood pump.

[0003] Generally, the blood pump has a driving mechanism and an impeller, the impeller is connected with a rotating part of the driving mechanism, in order to realize stable rotation of the rotating part, it is usually necessary to set a structure for positioning or limiting the rotating part, resulting in a relatively complex structure of the driving mechanism. SUMMARY

[0004] The purpose of the present application is to provide a driving mechanism and a blood pump with a relatively simple structure.

[0005] A driving mechanism, comprising:

[0006] a housing;

[0007] a rotating part rotatably mounted on the housing, the rotating part having a tapered head end;

[0008] a first shaft sleeve and a second shaft sleeve, both mounted on the housing, the first shaft sleeve being provided with a first shaft hole having a tapered hole portion, wherein the rotating part is rotatably arranged in the second shaft sleeve, at least part of the tapered head end is movably arranged in the first shaft hole, and the tapered head end can abut against the hole wall of the tapered hole portion;

[0009] a stopper fixed to the rotating part, the stopper being located between the first shaft sleeve and the second shaft sleeve, and the stopper can abut against the second shaft sleeve.

[0010] Optionally, the opening edge of the first shaft hole on the side close to the second shaft sleeve is rounded.

[0011] Optionally, the tapered hole portion has a first opening and a second opening, the diameter of the second opening is smaller than that of the first opening, the first shaft hole further has a straight hole portion in communication with the tapered hole portion, the straight hole portion is in communication with the second opening, so that the fluid can flow into the tapered hole portion from the second opening through the straight hole portion, and then flow out from the first opening.

[0012] Optionally, the length of the tapered hole portion along the central axis of the first shaft hole is 120% to 200% of the length of the straight hole portion.

[0013] Optionally, the tapered head end penetrates the second opening, and part of the tapered head end can extend into the straight hole portion.

[0014] Optionally, the tapered hole portion has a first opening and a second opening arranged along the central axis of the first shaft hole, the first opening is closer to the second shaft sleeve than the second opening, the aperture of the tapered hole portion gradually increases from the second opening to the first opening, and the aperture of the second opening is 50% to 80% of the aperture of the first opening.

[0015] And / or, the end of the small end of the tapered head end is formed as a spherical surface.

[0016] Optionally, there is a gap between the tapered head end and the hole wall of the tapered hole portion for fluid flow.

[0017] Optionally, the gap is 0.01mm to 0.015mm.

[0018] Optionally, the driving mechanism further comprises a stator capable of driving the rotating component to rotate, and the stator and the rotating component have a magnetic force acting therebetween, which can cause the gap between the tapered head end and the hole wall of the tapered hole portion.

[0019] Optionally, the tapered hole portion has a first opening on the side surface of the first shaft sleeve close to the second shaft sleeve, part of the tapered head end is located between the first opening and the second shaft sleeve, and the largest diameter part of the tapered head end is spaced apart from the first opening.

[0020] And / or, the inclination angle of the tapered surface of the tapered head end relative to the central axis of the tapered head end is the same as the inclination angle of the hole wall of the tapered hole portion relative to the central axis of the first shaft hole.

[0021] Optionally, the second shaft sleeve is provided with a second shaft hole, the rotating component penetrates the second shaft hole, and the rotating component and the hole wall of the second shaft hole have a gap for fluid flow. One side of the second shaft sleeve facing the stopper is partially recessed to form a flow guide groove, and the flow guide groove communicates with the second shaft hole. When the stopper abuts against the second shaft sleeve, part of the flow guide groove is not covered by the stopper.

[0022] Optionally, the rotating component comprises a rotating shaft and a rotor, the tapered head end is formed at one end of the rotating shaft, the other end of the rotating shaft is rotatably arranged in the second shaft sleeve, the rotor comprises a first rotor unit and a second rotor unit arranged along the axis of the rotating shaft, the first rotor unit and the second rotor unit are fixedly connected with the rotating shaft, the first rotor unit and the second rotor unit are located between the first shaft sleeve and the second shaft sleeve, and the stopper is located between the second rotor unit and the second shaft sleeve.

[0023] The driving mechanism further comprises a stator located between the first rotor unit and the second rotor unit, the stator is capable of driving the first rotor unit and the second rotor unit to rotate respectively.

[0024] Optionally, the first rotor unit is spaced apart from the first shaft sleeve along the axis of the rotating shaft by a distance.

[0025] A blood pump comprising an impeller and the above-mentioned driving mechanism, the impeller is connected with the rotating component, and the impeller is capable of rotating with the rotating component.

[0026] Since the stopper is fixedly connected with the rotating component, the stopper is capable of abutting against the second shaft sleeve, at least part of the tapered head end of the rotating component is movably arranged in the first shaft hole of the first shaft sleeve and movably abuts against the hole wall of the tapered hole part, so that the tapered head end of the rotating component abuts against the hole wall of the tapered hole part through the abutment of the stopper and the second shaft sleeve, thereby limiting the movement range of the rotating component in the axial direction, so as to realize the axial positioning of the rotating component; meanwhile, since the rotating component is arranged in the second shaft sleeve and the tapered head end of the rotating component is arranged in the first shaft hole of the first shaft sleeve, the radial swing range of the rotating component is limited, so as to realize the axial and radial positioning of the rotating component, and the structure is simpler. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort based on these drawings.

[0028] Figure 1 The structure schematic diagram of the blood pump provided by the present application;

[0029] Figure 2 The structure schematic diagram of the blood pump provided by the present application; Figure 1 The blood pump shown in the drawing omits the sectional view of part of the catheter;

[0030] Figure 3 The structure schematic diagram of the blood pump provided by the present application;Figure 1 A cross-sectional view of the blood pump assembly consisting of the shaft, stop, rotor, first bushing, and second bushing.

[0031] Figure 4 for Figure 3 A magnified view of part I shown;

[0032] Figure 5 for Figure 1 The diagram shows the structure of the blood pump where the stop and the rotating shaft are integrally formed.

[0033] Figure 6 for Figure 1 The diagram shows the disassembled structure of the rotor, stator, and limiting components of the blood pump.

[0034] Figure 7 for Figure 6 A schematic diagram of the structure of the first flywheel of the first rotor unit of the rotor;

[0035] Figure 8 for Figure 2 A magnified view of part II shown;

[0036] Figure 9 for Figure 2 A schematic diagram of the structure of the first bushing of the blood pump is shown.

[0037] Figure 10 for Figure 9 A sectional view of the first bushing shown;

[0038] Figure 11 for Figure 2 The diagram shows the structure of the support base for the blood pump.

[0039] Figure 12 for Figure 2 A magnified view of a portion of the blood pump shown;

[0040] Figure 13 for Figure 2 The diagram shows the structure of the second bushing of the blood pump. Detailed Implementation

[0041] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0042] Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. Thus, the appearances of the phrase "in one embodiment" or "in some embodiments" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0043] In the description of the application, it is to be understood that the orientations or positional relationships indicated by the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the orientations or positional relationships shown in the drawings, and are for the purpose of facilitating the description of the application and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application.

[0044] In addition, the terms "first", "second", "third", etc. are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features.

[0045] In the present application, unless specifically defined and limited otherwise, the terms "mounting", "connection", "connecting", "fixed", and the like should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. 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.

[0046] In the field of interventional medicine, the end of the instrument close to the operator is usually defined as the proximal end, and the end far from the operator is defined as the distal end.

[0047] The driving mechanism 10 and the blood pump 1 in the embodiment of the application will be described.

[0048] Please refer to Figure 1 The blood pump 1 comprises a driving mechanism 10 and an impeller 20. The driving mechanism 10 is in transmission connection with the impeller 20, and the driving mechanism 10 can drive the impeller 20 to rotate.

[0049] Specifically, the blood pump 1 further comprises a cannula 40 fixedly connected to the distal end of the driving mechanism 10. The impeller 20 is rotatably accommodated in the cannula 40. The cannula 40 has a blood outlet 42 and a blood inlet 41. When the impeller 20 rotates, blood flows into the cannula 40 from the blood inlet 41 and flows out of the cannula 40 from the blood outlet 42. In one embodiment, the cannula 40 extends through a heart valve, such as an aortic valve, the blood inlet 41 is located in the heart, and the blood outlet 42 and the driving mechanism 10 are located in a blood vessel outside the heart, such as the aorta.

[0050] Specifically, the blood pump 1 further comprises a catheter 50 connected to the proximal end of the driving mechanism 10. The catheter 50 is used to accommodate various supply lines. For example, the supply lines include a wire for electrical connection with the driving mechanism 10 and a flushing line for supplying flushing liquid to the blood pump 1. Optionally, the flushing liquid is normal saline, normal saline containing heparin, or glucose, etc.

[0051] Please refer to Figures 2 to 5 The driving mechanism 10 comprises a housing 100, a shaft 200, a stator 300, a rotor 400, a first shaft sleeve 510, a second shaft sleeve 520, and a stopper 600.

[0052] The housing 100 is generally a cylindrical housing with two open ends. The distal end of the housing 100 is fixedly connected to the cannula 40, and the proximal end of the housing 100 is fixedly connected to the catheter 50. The housing 100 has an inner cavity. Specifically, the inner cavity is divided into a limiting cavity 112 and a containing cavity 114. In the illustrated embodiment, the limiting cavity 112 and the containing cavity 114 are arranged along the axial direction of the housing 100.

[0053] The shaft 200 and the rotor 400 constitute a rotating component. The rotating component is rotatably mounted to the housing 100 and is used to connect with the impeller 20 to drive the impeller 20 to rotate.

[0054] The shaft 200 is rotatably mounted to the housing 100 and has a connecting end 210 for connecting with the impeller 20 and a tapered head end 220 away from the connecting end 210. In the illustrated embodiment, the shaft 200 extends generally along the axial direction of the housing 100, or in other words, the extending direction of the axis of the shaft 200 is generally consistent with the axial direction of the housing 100. The limiting cavity 112 and the containing cavity 114 are arranged along the axis of the shaft 200. The shaft 200 extends through the limiting cavity 112 and is partially accommodated in the containing cavity 114 and partially located outside the housing 100 or in other words, partially extends into the cannula 10. The part of the shaft 200 extending outside the housing 100 or extending into the cannula 10 is the connecting end 210 of the shaft 200; the tapered head end 220 is located in the containing cavity 114. Specifically, the impeller 20 is fixedly connected to the connecting end 210 so that the impeller 20 can rotate with the shaft 200.

[0055] In some embodiments, the rotating shaft 200 is made of ceramic material. Compared with metal material, ceramic material has higher machining precision, higher biocompatibility and mechanical strength, and better wear resistance and corrosion resistance.

[0056] The stator 300 is fixedly installed in the housing 100, i.e., the stator 300 is arranged in the inner cavity of the housing 100. In the illustrated embodiment, the stator 300 is located in the accommodation cavity 114. The stator 300 can drive the rotating member to rotate. The rotating shaft 200 is rotatably arranged in the stator 300.

[0057] The rotor 400 is located in the housing 100, i.e., the rotor 400 is also arranged in the inner cavity of the housing 100. In the illustrated embodiment, the rotor 400 is located in the accommodation cavity 114. The rotor 400 is fixedly connected to the rotating shaft 200, the stator 300 can drive the rotor 400 to rotate, and the rotor 400 can drive the rotating shaft 200 to rotate. Specifically, the rotor 400 has magnetism, and the stator 300 can generate a rotating magnetic field to drive the rotor 400 to rotate.

[0058] Please combine Figure 6 In the illustrated embodiment, the rotor 400 includes a first rotor unit 410 and a second rotor unit 420, and the first rotor unit 410 and the second rotor unit 420 are both fixedly connected to the rotating shaft 200. The first rotor unit 410 and the second rotor unit 420 are both rotatably accommodated in the accommodation cavity 114 of the housing 100. The first rotor unit 410 and the second rotor unit 420 are arranged along the axis of the rotating shaft 200. The stator 300 is located between the first rotor unit 410 and the second rotor unit 420. The first rotor unit 410 and the second rotor unit 420 both have magnetism, and the stator 300 can generate a rotating magnetic field to drive the first rotor unit 410 and the second rotor unit 420 to rotate.

[0059] Specifically, the first rotor unit 410 includes a first magnet 411, and the first magnet 411 is fixedly connected to the rotating shaft 200. The first magnet 411 is a ring-shaped Halbach array magnet.

[0060] Specifically, the first rotor unit 410 further includes a first flywheel 412, the first flywheel 412 is fixedly connected to the rotating shaft 200, and the first magnet 411 is fixedly connected to the first flywheel 412. By arranging the first flywheel 412, the connection strength of the first magnet 411 and the rotating shaft 200 can be enhanced, and the shaking of the rotating shaft 200 during rotation can be reduced, so that the entire rotating shaft 200 is more stable during rotation.

[0061] Please combine Figure 7, specifically, the first flywheel 412 includes a first built-in pipe 4121, a first disc-shaped part 4122, and a first outer ring wall 4123, the first built-in pipe 4121 and the first outer ring wall 4123 are both in a circular pipe structure, and the first disc-shaped part 4122 is in an annular disc structure. The first built-in pipe 4121 and the first outer ring wall 4123 are both fixedly connected with the first disc-shaped part 4122. The first outer ring wall 4123 is arranged around the first disc-shaped part 4122, the first built-in pipe 4121 and the first outer ring wall 4123 are coaxially arranged, the rotating shaft 200 is arranged in the first built-in pipe 4121 and fixedly connected with the first built-in pipe 4121, wherein a limiting part is arranged on the rotating shaft 200, and the end of the first built-in pipe 4121 is in abutment with the limiting part to form axial positioning, facilitating subsequent fixed connection. The first built-in pipe 4121 and the first outer ring wall 4123 form a first annular cavity 4124. The first magnet 411 is accommodated in the first annular cavity 4124. The shape of the first annular cavity 4124 is matched with the first magnet 411 to facilitate installation and positioning of the first magnet 411. Such an arrangement can enable the first flywheel 412 to limit the first magnet 411, facilitating installation of the first magnet 411 and making the combination of the first magnet 411 and the first flywheel 412 more stable.

[0062] It should be noted that the first flywheel 412 is not limited to the above structure, in some embodiments, the first flywheel 412 does not have the first outer ring wall 4123; in some embodiments, the first flywheel 412 does not have the first outer ring wall 4123 and the first built-in pipe 4121, at this time, the rotating shaft 200 is fixedly arranged in the center of the first disc-shaped part 4122. Compared with the first flywheel 412 having only the first disc-shaped part 4122, the first built-in pipe 4121 can make the first flywheel 412 more stably connected with the rotating shaft 200.

[0063] The second rotor unit 420 includes a second magnet 421 fixedly connected to the rotating shaft 200. Specifically, the second magnet 421 is a ring-shaped Halbach array magnet.

[0064] Specifically, the second rotor unit 420 further includes a second flywheel 422 fixedly connected to the rotating shaft 200, and the second magnet 421 is fixed to the second flywheel 422. By arranging the second flywheel 422, the connection strength of the second magnet 421 and the rotating shaft 200 can be enhanced; in addition, the shaking of the rotating shaft 200 during rotation can be reduced, so that the entire rotating shaft 200 is more stable during rotation.

[0065] Specifically, referring to Figure 3The second flywheel 422 comprises a second built-in pipe 4221, a second disc-shaped part 4222 and a second outer ring wall 4223. The second built-in pipe 4221 and the second outer ring wall 4223 are both in a circular pipe structure, and the second disc-shaped part 4222 is in an annular disc structure. The second built-in pipe 4221 and the second outer ring wall 4223 are fixedly connected with the second disc-shaped part 4222. The second outer ring wall 4223 is arranged around the second disc-shaped part 4222, and the second built-in pipe 4221 and the second outer ring wall 4223 are coaxially arranged. The rotating shaft 200 is arranged in the second built-in pipe 4221 and fixedly connected with the second built-in pipe 4221. A second annular cavity is formed between the second built-in pipe 4221 and the second outer ring wall 4223. The second magnet 421 is arranged in the second annular cavity. The shape of the second annular cavity is matched with the second magnet 421, so as to facilitate the installation and positioning of the second magnet 421. In this way, the second flywheel 422 can limit the second magnet 421, which facilitates the installation of the second magnet 421 and makes the combination of the second magnet 421 and the second flywheel 422 more stable.

[0066] It should be noted that the second flywheel 422 is not limited to the above structure. In some embodiments, the second flywheel 422 does not have the second outer ring wall 4223. In some embodiments, the second flywheel 422 does not have the second outer ring wall 4223 and the second built-in pipe 4221. In this case, the rotating shaft 200 is fixedly arranged in the center of the second disc-shaped part 4222. Compared with the second flywheel 422 having only the second disc-shaped part 4222, the second built-in pipe 4221 can make the second flywheel 422 more stably connected with the rotating shaft 200.

[0067] Specifically, the stator 300 is arranged between the first rotor unit 410 and the second rotor unit 420 and can drive the first rotor unit 410 and the second rotor unit 420 to rotate, respectively. Specifically, the stator 300 can generate a rotating magnetic field for driving the first rotor unit 410 to rotate and a rotating magnetic field for driving the second rotor unit 420 to rotate. The stator 300 is fixedly accommodated in the accommodating cavity 114 of the housing 100. The rotating shaft 200 is rotatably arranged in the stator 300.

[0068] The stator 300 comprises a magnetic core 310 and a coil 320. The coil 320 is wound on the magnetic core 310. Specifically, the magnetic core 310 is a plurality of magnetic cores 310 arranged around the axis of the rotating shaft 200. Each magnetic core 310 is provided with a coil 320.

[0069] Specifically, the driving mechanism 10 further comprises a limiting piece 700 fixed to the shell 100, and one end of each of the plurality of magnetic cores 310 is fixed to the limiting piece 700. Specifically, the limiting piece 700 is fixedly accommodated in the shell 100, for example, clamped to the inner side wall of the shell 100. The rotating shaft 200 is rotatably arranged in the limiting piece 700. The limiting piece 700 is a ring structure, and the limiting piece 700 is fixedly sleeved on the plurality of magnetic cores 310. In other embodiments, the limiting piece 700 can be provided with a plurality of through holes, the number and position of the through holes correspond to the plurality of magnetic cores 310, and the plurality of magnetic cores 310 are respectively arranged in the plurality of through holes to limit the plurality of magnetic cores 310 and separate adjacent magnetic cores 310.

[0070] The limiting piece 700 plays a role of fixing the stator 300, can realize positioning and installation of the stator 300, and reduces assembly difficulty of the stator 300. The limiting piece 700 can also reduce the setting of the positioning structure in the shell 100, thereby simplifying the structure of the shell 100 and simplifying the assembly process of the entire driving mechanism 10.

[0071] Please refer to Figure 2 , Figure 3 and Figure 4 again. The first shaft sleeve 510 and the second shaft sleeve 520 are both mounted to the shell 100. Specifically, the first shaft sleeve 510 is accommodated in the accommodating cavity 114, and the second shaft sleeve 520 is accommodated in the limiting cavity 112. The first shaft sleeve 510 and the second shaft sleeve 520 are both fixed to the shell 100. The first shaft sleeve 510 and the second shaft sleeve 520 are arranged in an axial direction of the shell 100 and can limit the rotating component. In the embodiment, the first shaft sleeve 510 and the second shaft sleeve 520 limit the rotating component by limiting the rotating shaft 200. The second shaft sleeve 520 is closer to the connecting end 210 of the rotating shaft 200 than the first shaft sleeve 510. The rotor 400 is located between the first shaft sleeve 510 and the second shaft sleeve 520; the stator 300 is also located between the first shaft sleeve 510 and the second shaft sleeve 520. In the illustrated embodiment, the first rotor unit 410, the second rotor unit 420, and the stator 300 are all located between the first shaft sleeve 510 and the second shaft sleeve 520; the first rotor unit 410 is arranged close to the first shaft sleeve 510, and the second rotor unit 420 is arranged close to the second shaft sleeve 520. In other words, the first shaft sleeve 510, the first rotor unit 410, the stator 300, the second rotor unit 420, and the second shaft sleeve 520 are sequentially arranged along the axis of the rotating shaft 200, and the second shaft sleeve 520 is closest to the connecting end 210 of the rotating shaft 200.

[0072] The first shaft sleeve 510 is provided with a first shaft hole 512 having a tapered hole portion 514. The rotating shaft 200 is rotatably arranged in the second shaft sleeve 520, and at least part of the tapered head end 220 of the rotating shaft 200 is movably arranged in the first shaft hole 512, and the tapered head end 220 can abut against the hole wall of the tapered hole portion 514. The first shaft sleeve 510 can support and limit the tapered head end 220 of the rotating shaft 200, so as to limit the moving range of the rotating shaft 200 along the axis of the rotating shaft 200 away from the impeller 20, and limit the swing range of the tapered head end 220 in the radial direction of the rotating shaft 200.

[0073] Please refer to Figure 8 、 Figure 9 and Figure 10 , in particular, the opening edge of the first shaft hole 512 near the rotor 400 is provided with a chamfer 513. Since the tapered head end 220 away from the connecting end 210 will have a small amplitude radial swing during rotation of the rotating shaft 200, the chamfer 513 is provided to avoid scratching and wear of the rotating shaft 200 by the opening edge of the first shaft hole 512 with edges.

[0074] In particular, the hole diameter of the tapered hole portion 514 gradually decreases along the central axis of the first shaft hole 512 and away from the second shaft sleeve 520. The tapered hole portion 514 has a first opening 512a near the second shaft sleeve 520, and the tapered head end 220 is arranged in the first opening 512a. The cross section of the tapered hole portion 514 is in the shape of a conical funnel, and the tapered head end 220 and the tapered hole portion 514 are matched in shape, so that the hole wall of the tapered hole portion 514 can better hold the tapered head end 220.

[0075] Compared with the straight cylinder rotating shaft and the straight cylinder first shaft hole, the scheme of the present embodiment can first realize axial support, and eliminate the structure or component for axial positioning, reduce assembly error, and have better assembly process; secondly, under the premise of the same axial depth of the first shaft hole, the contact surface between the tapered head end 220 and the tapered hole portion 514 is a slope, which has a larger contact area than the straight wall of the straight cylinder first shaft hole, and causes less wear; finally, since the blood pump 1 will have a small amplitude axial float and a small amplitude radial swing during operation, and the swing amplitude of the end away from the impeller 20 is the largest, the straight cylinder rotating shaft has a risk of being stuck by the hole wall of the straight cylinder first shaft hole, while the tapered head end 220 can adapt to the radial swing by axial float in the tapered hole portion 514, so as to reduce the risk of the rotating shaft 200 being stuck.

[0076] Moreover, compared with the ball-shaped rotating shaft and the concave spherical first shaft hole, when the tapered head end 210 and the hole wall of the tapered hole portion 514 are in contact, the contact area of the tapered head end 210 and the hole wall of the tapered hole portion 514 in the radial direction is large, the radial support effect is better, and the stability is better. Moreover, because the contact area in the radial direction is large, the wear is also small.

[0077] Specifically, the tapered hole portion 514 further has a second opening 516a, and the first opening 512a is closer to the second shaft sleeve 520 than the second opening 516a. The second opening 516a is coaxial with the first opening 512a, that is, the first opening 512a and the second opening 516a are arranged along the central axis of the first shaft hole 512. Wherein, from the second opening 516a to the first opening 512a, the hole diameter of the tapered hole portion 514 gradually increases, that is, the hole diameter of the second opening 516a is smaller than the hole diameter of the first opening 512a.

[0078] The first shaft hole 512 further has a straight hole portion 516 in communication with the tapered hole portion 514, and the straight hole portion 516 is in communication with the second opening 516a. Wherein, the straight hole portion 516 can be in communication with the flushing pipeline in the catheter 50, so that the flushing liquid can flow into the tapered hole portion 514 from the second opening 516a after passing through the straight hole portion 516, and then flow out from the first opening 512a. The flushing liquid entering between the hole wall of the tapered hole portion 514 and the tapered head end 220 can play a lubricating role to reduce the friction coefficient between the tapered head end 220 and the hole wall of the tapered hole portion 514, thereby reducing the wear of the tapered head end 220 and the hole wall of the tapered hole portion 514.

[0079] Specifically, the central axis of the straight hole portion 516 and the central axis of the tapered hole portion 514 coincide, so that the straight hole portion 516 is a straight hole with a constant hole diameter to reduce the energy consumption of the flushing liquid in the straight hole portion 516.

[0080] Specifically, the hole diameter r of the second opening 516a is 50% to 80% of the hole diameter R of the first opening 512a. In the embodiment shown, because the hole diameter of the straight hole portion 516 is constant, that is, the hole diameter of the straight hole portion 516 is 50% to 80% of the hole diameter of the second opening 512a. If the hole diameter of the second opening 516a is too large, the depth of the tapered hole portion 514 will be small, thereby reducing the contact area when the tapered head end 220 and the hole wall of the tapered hole portion 514 are in contact, which will increase the wear of the hole wall of the tapered hole portion 514 on the tapered head end 220. If the hole diameter of the second opening 516a is too small, it will affect the amount of flushing liquid entering the tapered hole portion 514. The flushing liquid entering the first shaft hole 512 can provide a force to the tapered head end 220 on one hand, and enter between the tapered head end 220 and the hole wall of the tapered hole portion 514 to play a lubricating role on the other hand, so as to reduce the friction coefficient between the tapered head end 220 and the hole wall of the tapered hole portion 514. Therefore, the amount of flushing liquid entering the first shaft hole 512 should not be too small.

[0081] Specifically, along the extension direction of the central axis of the first shaft hole 512, the length s1 of the tapered hole portion 514 is 120% to 200% of the length s2 of the straight hole portion 516 (the length s1 of the tapered hole portion 514 is the distance between the first opening 512a and the second opening 516a). In the illustrated embodiment, since the hole wall of the tapered hole portion 514 has an axial and radial limiting effect on the tapered head end 220, and under the limited axial thickness of the first shaft sleeve 510, if the length of the straight hole portion 516 is too long, the depth of the tapered hole portion 514 will be too shallow (i.e. the length along the central axis of the first shaft hole 512 will be too short), the axial portion of the tapered head end 220 placed in the tapered hole portion 514 will be too short, and the area of the radial support of the tapered head end 220 will be too small, resulting in poor radial support effect of the tapered head end 220. Conversely, if the length of the straight hole portion 516 is too short, the depth of the tapered hole portion 514 will be too deep, the axial portion of the tapered head end 220 placed in the tapered hole portion 514 will be too much, and the impeller of the connecting end 210 will tend to be a straight cylinder in radial support, and the radial limiting will be more firm. However, the impeller will vibrate during rotation, causing the shaft 200 to deviate slightly. Since the shaft 200 has a relatively long axial length, the deviation of the tapered head end 220 away from the connecting end 210 will be larger. If the tapered head end 220 is completely limited in the radial direction, it will not be able to adapt to the deviation, resulting in poor rotation of the shaft 200, and there will be a high risk of jamming.

[0082] Specifically, the tapered head end 220 is arranged through the second opening 516a, and part of the tapered head end 220 can extend into the straight hole portion 516, i.e. the straight hole portion 516 can accommodate the small head end of the tapered head end 220 (i.e. the end of the tapered head end 220 away from the connecting end 210). The length of the part of the tapered head end 220 that can extend into the straight hole portion 516 is less than or equal to the length of the straight hole portion 516 along the central axis of the first shaft hole 512, so as to avoid the tapered head end 220 extending out of the side of the straight hole portion 516 away from the second opening 516a and contacting other components to cause scratching and wear. Furthermore, the small head end of the tapered head end 220 is formed as a spherical surface. When the flushing liquid flows into the straight hole portion 516, it will be dispersed by the convex spherical surface after being axially impacted on the spherical surface, and then the flushing liquid entering in the axial direction can be distributed into the gap between the tapered head end 220 and the hole wall of the tapered hole portion 514, so that the flushing liquid flows more smoothly. Furthermore, setting the small head end of the tapered head end 220 as a spherical surface can also reduce the scratching and wear of the tapered head end 220 on the first shaft sleeve 510.

[0083] Specifically, the taper head end 220 and the hole wall of the tapered hole portion 514 have a gap for fluid flow. Specifically, the stator 300 and the rotating part have a magnetic force action that can cause the taper head end 220 and the hole wall of the tapered hole portion 514 to have the above-mentioned gap. In the present embodiment, under the magnetic force action of the stator 300 and the first rotor unit 410 and the second rotor unit 420, respectively, the taper head end 220 and the hole wall of the tapered hole portion 514 have the above-mentioned gap. Since the stator 300 is located between the first rotor unit 410 and the second rotor unit 420, the first rotor unit 410 and the second rotor unit 420 are fixedly connected to the rotating shaft 200, and the rotating shaft 200 is installed and matched with the first shaft sleeve 510, under the magnetic force action of the stator 300 and the first rotor unit 410 and the second rotor unit 420, the taper head end 220 and the hole wall of the tapered hole portion 514 form a gap L, which can be used for the flow of the flushing liquid. More specifically, the gap is 0.01mm-0.015mm, and the flushing liquid can enter the gap to form a lubricating film, so that the taper head end 220 and the hole wall of the tapered hole portion 514 form a fluid dynamic pressure bearing, so that the rotating shaft 200 tends to be dynamically stable in the radial direction when rotating. During the rotation of the rotating shaft 200, it will move back and forth in the axial direction. Due to the magnetic force action between the stator 300 and the first rotor unit 410 and the second rotor unit 420, the rotating shaft 200 after the movement will return to the initial axial position before the movement in the axial direction. It can be understood that the rotating shaft 200 always tends to a dynamic balance state. Since the lubricating area between the taper head end 220 and the hole wall of the tapered hole portion 514 is large, the wear is small, and the gap is in the range of 0.01mm-0.015mm, the stability is good. If the gap is less than 0.01mm, the thickness of the lubricating film formed by the flushing liquid is small, and the lubricating effect is poor. If the gap is greater than 0.015, the hole wall of the tapered hole portion 514 weakens the support effect of the taper head end 220, the radial support effect decreases, and the stability decreases.

[0084] Specifically, the first opening 512a is located on a side surface of the first shaft sleeve 510 close to the second shaft sleeve 520, a part of the tapered head end 220 is located between the first opening 512a and the second shaft sleeve 520, and the largest diameter part of the tapered head end 220 is spaced apart from the first opening 512a. That is, the part of the tapered head end 220 is located outside the tapered hole portion 514. In the illustrated embodiment, the rotating shaft 200 has a shaft body 230, the tapered head end 220 is formed at an end of the shaft body 230 close to the first shaft sleeve 510, and the joint between the tapered head end 220 and the shaft body 230 is always located outside the tapered hole portion 514, so that the tapered head end 220 is not completely located in the tapered hole portion 514, and thus the corner of the joint between the tapered head end 220 and the shaft body 230 cannot enter the tapered hole portion 514, avoiding scratching and abrasion with the hole wall of the tapered hole portion 514. Specifically, the diameter of the end of the shaft body 230 close to the first shaft sleeve 510 is the same as the largest diameter part of the tapered head end 220.

[0085] In the illustrated embodiment, the hole wall of the tapered hole portion 514 is adapted to the outer wall of the tapered head end 220, that is, the inclination angle of the tapered surface 221 of the tapered head end 220 with respect to the central axis of the tapered head end 220 is the same as the inclination angle of the hole wall of the tapered hole portion 514 with respect to the central axis of the first shaft hole 512. In this way, the hole wall of the tapered hole portion 514 and the tapered surface 221 of the tapered head end 220 can have as large a contact area as possible when they are in contact, reducing the abrasion between the hole wall of the tapered hole portion 514 and the tapered surface 221 of the tapered head end 220.

[0086] In the illustrated embodiment, the first rotor unit 410 and the second rotor unit 420 are fixedly connected to the shaft body 230, and the first shaft sleeve 510 is spaced apart from the first rotor unit 410 by a certain distance. The first shaft sleeve 510 and the first rotor unit 410 are spaced apart by a certain distance to avoid direct contact between the first shaft sleeve 510 and the first rotor unit 410 and thus abrasion.

[0087] Please refer to Figure 9 , Figure 10 and Figure 11 together, specifically, the driving mechanism 10 further comprises a support seat 800 fixedly connected to the housing 100. The support seat 800 is provided with a mounting cavity 810 and a liquid inlet hole 820 in communication with the mounting cavity 810, and the first shaft sleeve 510 is mounted in the mounting cavity 810. The straight hole portion 516 is in communication with the liquid inlet hole 820. The end of the liquid inlet hole 820 away from the mounting cavity 810 is used to communicate with the flushing pipeline of the catheter 50, so that the flushing liquid can flow into the gap between the hole wall of the tapered hole portion 514 and the tapered head end 220 through the liquid inlet hole 820 and the straight hole portion 516, and then flow into the inner cavity of the housing 100.

[0088] Specifically, the installation cavity 810 has a cavity bottom 812, one opening of the liquid inlet hole 820 is located at the cavity bottom 812 of the installation cavity 810, a support step 813 is arranged in the installation cavity 810, the support step 813 abuts against the first shaft sleeve 510, so that the first shaft sleeve 510 is spaced apart from the cavity bottom 812 by a distance, so as to better ensure the unobstructed flow of the flushing liquid. Specifically, the support step 813 abuts against the side of the first shaft sleeve 510 which is away from the second shaft sleeve 520.

[0089] Please refer to Figure 2 、 Figure 3 、 Figure 12 and Figure 13 , the second shaft sleeve 520 is provided with a second shaft hole 522, and the rotating shaft 200 is rotatably arranged in the second shaft hole 522. In the illustrated embodiment, the center axis of the second shaft hole 522 coincides with the center axis of the straight hole part 516 of the first shaft sleeve 510. The hole wall of the second shaft hole 522 of the second shaft sleeve 520 and the rotating shaft 200 have a gap for fluid flow. Among them, the flushing liquid entering the accommodation cavity 114 can flow out of the shell 100 through the gap between the rotating shaft 200 and the hole wall of the second shaft hole 522.

[0090] The stopper 600 is fixed to the rotating component, specifically, the stopper 600 is fixed to at least one of the rotating shaft 200 and the rotor 400 (specifically, the second rotor unit 420), in other words, the stopper 600 can be directly fixed with only the rotor 400, or directly fixed with only the rotating shaft 200, or directly fixed with both the rotor 400 and the rotating shaft 200. Since the rotor 400 is fixed to the rotating shaft 200, the stopper 600, the rotating shaft 200 and the rotor 400 rotate and move synchronously. The stopper 600 is located between the rotor 400 and the second shaft sleeve 520, and the stopper 600 can abut against the second shaft sleeve 520 to limit the movement of the rotating shaft 200 along the axis of the rotating shaft 200 towards the impeller 20.

[0091] Due to the synchronous rotation and movement of the stopper 600, the rotating shaft 200 and the rotor 400, the stopper 600 can abut against the second shaft sleeve 520 to limit the movement of the rotating shaft 200 along the axis of the rotating shaft 200 towards the impeller 20, and at least part of the conical head end 220 can be movably arranged in the first shaft hole 512 of the first shaft sleeve 510 and movably abut against the hole wall of the conical hole portion 514 to limit the movement range of the rotating shaft 200 along the axis of the rotating shaft 200 away from the impeller 20, thereby achieving the limiting of the rotating shaft 200 on the axis of the rotating shaft 200; at the same time, due to the rotating shaft 200 penetrating the second shaft sleeve 520 and the conical head end 220 being arranged in the first shaft hole 512 of the first shaft sleeve 510, the hole wall of the conical hole portion 514 of the first shaft sleeve 510 can also limit the swing range of the conical head end 220 in the radial direction of the rotating shaft 200, thereby achieving the limitation of the radial swing range of the rotating shaft 200. In other words, the above design not only achieves the axial limiting of the rotating shaft 200, but also achieves the radial limiting of the rotating shaft 200.

[0092] In the illustrated embodiment, the stopper 600 and the rotating shaft 200 are fixedly connected, specifically, the stopper 600 is integrally formed with the rotating shaft. In some embodiments, the stopper 600 can also be bonded to the rotating shaft 200. Due to the small overall volume of the blood pump 1, the volume of the stopper 600 is smaller, the machining precision is difficult, and the assembly is difficult, the stopper 600 and the rotating shaft 200 are integrally formed, which is guaranteed in precision, convenient to install, and saves the bonding operation.

[0093] Specifically, when the stopper 600 abuts against the second shaft sleeve 520, the stopper 600 and the inner wall of the limiting cavity 112 have a gap for fluid communication, and the second shaft sleeve 520 is spaced apart from the rotor 400 by a distance. By making the stopper 600 and the inner wall of the limiting cavity 112 have a gap for fluid communication, so that the flushing liquid can flow into the gap between the hole walls of the second shaft hole 522 of the second shaft sleeve 520 through the gap between the stopper 600 and the inner wall of the limiting cavity 112, that is, the fluid communication between the second shaft hole 522 of the second shaft sleeve 520 and the accommodating cavity 114 is realized; when the stopper 600 abuts against the second shaft sleeve 520, the second shaft sleeve 520 is spaced apart from the rotor 400 by a distance to avoid the rotor 400 directly contacting the second shaft sleeve 520 to cause friction and wear, that is, to avoid the second rotor 420 and the second shaft sleeve 520 from being worn.

[0094] Specifically, the stopper 600 is substantially annular, and the central axis of the stopper 600 coincides with the axis of the rotating shaft 200. The outer diameter of the stopper 600 is smaller than the inner diameter of the limiting cavity 112, so that there is a gap between the stopper 600 and the inner annular wall of the limiting cavity 112 for fluid communication. In other embodiments, the stopper 600 can also be arranged by a plurality of fan rings which are uniformly spaced around the rotating shaft 200, or can be understood as being arranged by a plurality of fan rings which are circumferentially discrete.

[0095] Specifically, the stopper 600 is partially located in the limiting cavity 112 and partially located in the accommodating cavity 114 along the axis of the rotating shaft 200, so that the gap between the stopper 600 and the inner wall of the limiting cavity 112 has a length along the axis, facilitating the collection and flow of the flushing liquid.

[0096] Specifically, the side of the second shaft sleeve 520 facing the stopper 600 is partially recessed to form a flow guide groove 524, and the flow guide groove 524 is in communication with the second shaft hole 522 of the second shaft sleeve 520; when the stopper 600 abuts against the second shaft sleeve 520, part of the flow guide groove 524 is not covered by the stopper 600, so that even if there is a problem of flushing liquid communication obstruction caused by the stopper 600 blocking the gap between the second shaft hole 522 of the second shaft sleeve 520 and the rotating shaft 200 when the stopper 600 abuts against the second shaft sleeve 520, the flow guide groove 524 not covered by the stopper 600 can realize fluid communication when the stopper 600 abuts against the second shaft sleeve 520, ensuring the smoothness of flushing liquid communication; in addition, by partially recessing the side of the second shaft sleeve 520 facing the stopper 600 to form the flow guide groove 524, the flushing liquid can better flow into the space between the stopper 600 and the second shaft sleeve 520, so as to play a lubricating role on the contact surface of the stopper 600 and the second shaft sleeve 520, reduce the friction between the stopper 600 and the second shaft sleeve 520, and reduce the wear problem caused by the friction between the stopper 600 and the second shaft sleeve 520.

[0097] The stopper 600 has a stop surface 610 which is perpendicular to the axis of the rotating shaft 200, and the second shaft sleeve 520 has a limiting surface 526 which is perpendicular to the central axis of the second shaft hole 522 of the second shaft sleeve 520, and the limiting surface 526 is opposite to the stop surface 610 and can abut against the stop surface 610 to limit the movement of the rotating shaft 200 along the axis of the rotating shaft 200 towards the impeller 20. Since the stop surface 610 is perpendicular to the axis of the rotating shaft 200 and the limiting surface 526 is perpendicular to the central axis of the second shaft hole 522 of the second shaft sleeve 520, the rotating shaft 200 can be rotatably arranged in the second shaft hole 522 of the second shaft sleeve 520, so that when the stopper 600 abuts against the second shaft sleeve 520 during normal operation of the rotating shaft 200, the stop surface 610 and the limiting surface 526 can be in surface-to-surface contact, thereby reducing the abrasion caused by the friction between the stopper 600 and the second shaft sleeve 520. Specifically, the guide groove 524 is a local recess of the limiting surface 526.

[0098] Specifically, the roughness of at least one of the stop surface 610 and the limiting surface 526 is less than or equal to 0.1 microns. In some embodiments, the roughness of both the stop surface 610 and the limiting surface 526 is less than or equal to 0.1 microns. In some embodiments, the roughness of one of the stop surface 610 and the limiting surface 526 is less than or equal to 0.1 microns. By reducing the roughness of at least one of the stop surface 610 and the limiting surface 526, the friction between the stop surface 610 and the limiting surface 526 can be effectively reduced, thereby reducing the abrasion problem caused by the friction between the second shaft sleeve 520 and the stopper 600.

[0099] In some embodiments, at least one of the stop surface 610 and the limiting surface 526 is a ceramic surface. Ceramic has high machining precision, high biocompatibility, high mechanical strength, good wear resistance and corrosion resistance. At this time, the material of the stopper 600 and the second shaft sleeve 520 can be ceramic, or at least one of the stop surface 610 and the limiting surface 526 can be realized by setting a ceramic coating. In some embodiments, the material of the stop surface 610 is diamond, so that the stop surface 610 has high hardness, a relatively smooth surface, and is resistant to wear. At this time, the material of the stop surface 610 can be realized by setting a diamond coating.

[0100] It can be understood that the structure of the driving mechanism 10 is not limited to the above structure. In some embodiments, the rotor has one rotor unit, and at this time, the rotor 400 and the stator 300 are located between the first shaft sleeve 510 and the second shaft sleeve 520, one of the rotor 400 and the stator 300 is close to the first shaft sleeve 510, and the other is close to the second shaft sleeve 520. In some embodiments, the rotor 400 has a first rotor unit 410 and a second rotor unit 420, and the stator 300 has a first stator unit and a second stator unit, and at this time, the first stator unit and the second stator unit are arranged in an axis layering manner and located between the first rotor unit 410 and the second rotor unit 420, the first stator unit can drive the first rotor unit 410 to rotate, and the second stator unit can drive the second rotor unit 420 to rotate. In some embodiments, the taper head 220 can also be provided on the rotor 400, for example, provided on the first rotor unit 410 (specifically, can be formed on the first disc-shaped part 4122 of the first flywheel 412); when the rotor 400 has one rotor unit, in order to facilitate the taper head 220 to be provided on the rotor 400, the rotor 400 is arranged close to the first shaft sleeve 510.

[0101] The above only describes the preferred embodiments of the present application and is not used to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A driving mechanism, characterized in that, the driving mechanism comprises: a housing; a rotating component rotatably mounted on the housing, the rotating component having a tapered head end; a first shaft sleeve and a second shaft sleeve, both mounted on the housing, the first shaft sleeve having a first shaft hole with a tapered hole portion, wherein the rotating component is rotatably arranged in the second shaft sleeve, at least part of the tapered head end is movably arranged in the first shaft hole, and the tapered head end is capable of abutting against the hole wall of the tapered hole portion; a stopper fixed to the rotating component, the stopper being located between the first shaft sleeve and the second shaft sleeve, and capable of abutting against the second shaft sleeve; the tapered hole portion has a first opening and a second opening, the diameter of the second opening is smaller than that of the first opening, the first shaft hole further has a straight hole portion in communication with the tapered hole portion, the straight hole portion is in communication with the second opening, so that fluid can flow from the second opening into the tapered hole portion through the straight hole portion, and then flow out from the first opening; the small end of the tapered head end is formed with a spherical surface, the tapered head end is arranged in the second opening, so that the small end of the tapered head end can extend into the straight hole portion, and the spherical surface is located in the straight hole portion; the tapered head end has a tapered surface, the tapered surface of the tapered head end is not completely located in the tapered hole portion, so that part of the tapered surface of the tapered head end is located between the first opening and the second opening, and part of the tapered surface of the tapered head end is located between the first opening and the second shaft sleeve.

2. The drive mechanism of claim 1, wherein: The opening edge of the first shaft hole near the second shaft sleeve is rounded.

3. The drive mechanism of claim 1, wherein: The second shaft sleeve has a second shaft hole, the rotating component is rotatably arranged in the second shaft hole, and the center axis of the second shaft hole coincides with the center axis of the straight hole portion.

4. The drive mechanism of claim 1, wherein: The length of the tapered hole portion along the center axis of the first shaft hole is 120% to 200% of the length of the straight hole portion.

5. The drive mechanism of claim 1, wherein: The rotating component comprises a rotating shaft and a rotor, the rotor is fixed to the rotating shaft, and the rotor has magnetic properties; the tapered head end is arranged on the rotor.

6. The drive mechanism of claim 1, wherein: The first opening is closer to the second shaft sleeve than the second opening, the diameter of the tapered hole portion gradually increases from the second opening to the first opening, and the diameter of the second opening is 50% to 80% of the diameter of the first opening.

7. The drive mechanism of claim 1, wherein: The tapered head end and the hole wall of the tapered hole portion have a gap for fluid flow.

8. The drive mechanism of claim 7, wherein: The gap is 0.01mm to 0.015mm.

9. Drive mechanism according to claim 7 or 8, characterized in that: The driving mechanism further comprises a stator capable of driving the rotating component to rotate, the stator and the rotating component have a magnetic force action therebetween, and the magnetic force action can cause the gap between the tapered head end and the hole wall of the tapered hole portion.

10. The drive mechanism of claim 1, wherein: The conical hole portion has a first opening on a side surface of the first shaft sleeve close to the second shaft sleeve, a part of the conical head end is located between the first opening and the second shaft sleeve, and the largest diameter part of the conical head end is spaced apart from the first opening by a distance; And / or, the inclination angle of the conical surface of the conical head end relative to the central axis of the conical head end is the same as the inclination angle of the hole wall of the conical hole portion relative to the central axis of the first shaft hole.

11. The drive mechanism of claim 1, wherein: The second shaft sleeve is provided with a second shaft hole, the rotating part is rotatably arranged in the second shaft hole, and a gap for fluid communication is formed between the rotating part and the hole wall of the second shaft hole. One side of the second shaft sleeve facing the stopper is partially recessed to form a flow guide groove, and the flow guide groove is in communication with the second shaft hole; when the stopper abuts against the second shaft sleeve, part of the flow guide groove is not covered by the stopper.

12. The drive mechanism of claim 1, wherein: The rotating part includes a rotating shaft and a rotor, the conical head end is formed at one end of the rotating shaft, the other end of the rotating shaft is rotatably arranged in the second shaft sleeve, the rotor includes a first rotor unit and a second rotor unit arranged along the axis of the rotating shaft, the first rotor unit and the second rotor unit are fixedly connected with the rotating shaft, the first rotor unit and the second rotor unit are located between the first shaft sleeve and the second shaft sleeve, and the stopper is located between the second rotor unit and the second shaft sleeve. The driving mechanism further includes a stator located between the first rotor unit and the second rotor unit, and the stator can drive the first rotor unit and the second rotor unit to rotate, respectively.

13. The drive mechanism of claim 12, wherein: The first rotor unit and the first shaft sleeve are spaced apart by a distance along the axis of the rotating shaft.

14. A blood pump, characterized by: The impeller is connected with the rotating part, and the impeller can rotate with the rotating part.

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