Drive device and blood pump

Abstract

The application relates to a driving device and a blood pump. The driving device comprises a housing assembly, a rotating part, a rotor and a stator. The housing assembly is provided with a mounting hole having a concave spherical wall. The rotating part comprises a rotating shaft and a rotating head fixed to the rotating shaft. The rotating shaft is rotatably mounted on the housing assembly and has a connecting section outside the housing assembly for connecting with an impeller. The rotating head is rotatably arranged in the mounting hole and has a convex spherical surface which protrudes in a direction away from the connecting section along the axis of the rotating shaft and can abut against the concave spherical wall. The stator can drive the rotor to rotate. The rotor and the stator have a magnetic force action therebetween. The magnetic force action can make the convex spherical surface abut against the concave spherical wall. The above-mentioned driving device and blood pump have low assembly difficulty.

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 comprising the same. BACKGROUND

[0002] An intravascular blood pump is a blood pumping device which can be inserted into a patient's heart through a blood vessel of the patient, and is placed in an opening of a heart valve so that blood can flow through the blood pump and into an arterial blood vessel. The blood pump comprises a driving part and an impeller, a driving shaft of the driving part is connected to the impeller to drive the impeller to rotate. However, since the driving part of the intravascular blood pump is very small in size, the internal components thereof are also very small, and it is difficult to assemble the same, which directly affects the production efficiency and yield of the blood pump. SUMMARY

[0003] In view of this, it is necessary to provide a driving device and a blood pump which are low in assembly difficulty.

[0004] A driving device for driving an impeller to rotate, the driving device comprising:

[0005] a housing assembly provided with a mounting hole, the mounting hole having a concave spherical wall;

[0006] a rotating component comprising a rotating shaft and a rotating head fixed to the rotating shaft, the rotating shaft being rotatably mounted to the housing assembly, the rotating shaft having a connecting section located outside the housing assembly and used for connecting with the impeller; the rotating head being rotatably arranged in the mounting hole, the rotating head having a convex spherical surface, the convex spherical surface protruding in a direction away from the connecting section along an axis of the rotating shaft, and the convex spherical surface being capable of abutting against the concave spherical wall;

[0007] a rotor fixed to the rotating shaft; and

[0008] a stator capable of driving the rotor to rotate, the rotor and the stator having a magnetic force acting therebetween, the magnetic force being capable of abutting the convex spherical surface against the concave spherical wall.

[0009] In one of the embodiments, along the axis of the rotating shaft, the rotor is located between the rotating head and the stator; the rotor and the stator have an attractive force therebetween, and the convex spherical surface is abutted against the concave spherical wall under the action of the attractive force.

[0010] In one of the embodiments, the rotor comprises a first rotor unit and a second rotor unit, the rotating head, the first rotor unit, the stator and the second rotor unit are sequentially arranged along the axis of the rotating shaft, the stator is capable of driving the first rotor unit and the second rotor unit to rotate, the stator and the first rotor unit have a first attractive force, the stator and the second rotor unit have a second attractive force, the first attractive force is greater than the second attractive force, and the convex spherical surface is abutted against the concave spherical wall under the joint action of the first attractive force and the second attractive force.

[0011] In one of the embodiments, the stator comprises a plurality of magnetic cores, a plurality of coils and a positioning member, the plurality of magnetic cores are arranged at intervals along a circle, the plurality of coils are wound on the plurality of magnetic cores respectively, and the positioning member is fixedly connected with the plurality of magnetic cores. The positioning member separates the adjacent magnetic cores, and the material of the positioning member is polyether ether ketone or ceramic.

[0012] In one of the embodiments, the housing assembly further has a receiving cavity in communication with the mounting hole, and the rotor and the stator are mounted in the receiving cavity. The mounting hole has a first opening and a second opening opposite to the first opening. The first opening is in communication with the receiving cavity. The diameter of the mounting hole gradually increases from the first opening to the second opening. The concave spherical wall extends from the first opening to the second opening. The rotating head further has a bottom surface connected with the convex spherical surface. When the convex spherical surface is abutted against the concave spherical wall, the bottom surface is flush with the plane where the second opening is located.

[0013] In one of the embodiments, the ratio of the diameter of the first opening to the diameter of the bottom surface of the rotating head is 0.3 to 0.6.

[0014] In one of the embodiments, the local recess of the convex spherical surface forms a flow guide groove. The flow guide groove extends from the bottom surface of the rotating head along the convex spherical surface in a direction away from the bottom surface. The flow guide groove is in communication with the receiving cavity.

[0015] In one of the embodiments, the housing assembly further has a receiving cavity and a communication hole in communication with the mounting hole and the receiving cavity. The diameter of the mounting hole gradually increases in a direction away from the communication hole. The rotating shaft is rotatably arranged in the communication hole. The hole wall of the communication hole is locally recessed to form a drainage groove extending along the axis of the communication hole. The drainage groove is in communication with the receiving cavity and the mounting hole. The rotor and the stator are mounted in the receiving cavity.

[0016] In one of the embodiments, the housing assembly comprises a housing and a sleeve, the housing has a receiving cavity and a communicating port communicating with the receiving cavity, the sleeve is installed in the receiving cavity, the sleeve has an outer surface flush with the plane where the communicating port is located; the mounting hole is formed on the sleeve, the mounting hole has a first opening and a second opening opposite to the first opening, the first opening communicates with the receiving cavity, and the plane where the second opening is located is flush with the outer surface of the sleeve.

[0017] In one of the embodiments, the rotating head further has a bottom surface connected with the convex spherical surface, the rotating shaft is fixedly penetrated through the rotating head, the axis of the rotating shaft passes through the center of the bottom surface and is perpendicular to the bottom surface.

[0018] Alternatively, the rotating head further has a bottom surface connected with the convex spherical surface, one end of the connecting segment is fixedly connected with the bottom surface, and the axis of the connecting segment passes through the center of the bottom surface and is perpendicular to the bottom surface, the rotating shaft further comprises an inner built-in segment separated from the connecting segment, the inner built-in segment is coaxially arranged with the connecting segment, the inner built-in segment is fixedly connected with the rotating head, and the rotor is fixedly connected with the inner built-in segment.

[0019] A blood pump comprising an impeller and the driving device as described in any one of the above embodiments, the connecting segment is fixedly connected with the impeller.

[0020] The driving device and the blood pump described above, since the mounting hole of the housing assembly has a concave spherical surface wall, the rotating head fixedly connected with the rotating shaft has a convex spherical surface protruding in the direction away from the connecting segment of the rotating shaft along the axis of the rotating shaft for connecting the impeller, and the convex spherical surface is abutted against the concave spherical surface wall by the magnetic force acting between the rotor and the stator, the axial and radial positions of the rotating shaft can be limited, the structure of the driving device is more simple and compact, and the assembly difficulty of the driving device is greatly reduced.

[0021] Furthermore, since the convex spherical surface of the rotating head protrudes along the axis of the rotating shaft in a direction away from the connecting section of the rotating shaft, and the concave spherical wall of the mounting hole is used to abut against the convex spherical surface, the concave direction of the mounting hole's concave spherical wall is from the outside towards the inside of the housing assembly. This structural design allows the impeller to be fixed to the rotating shaft before installing it onto the housing assembly during drive assembly, enabling direct testing and adjustment of the coaxiality between the impeller and the rotating shaft. Then, the rotating shaft with the impeller fixed to it is assembled onto the housing assembly through the mounting hole. This ensures a high degree of coaxiality between the drive unit's rotating shaft and impeller. This approach helps reduce assembly difficulty, improves the production efficiency and yield of the drive unit and blood pump, and enhances their reliability. However, due to their structural design, such as the convex spherical surface protruding towards the connecting section near the shaft and the concave spherical surface recessed towards the connecting section near the shaft, traditional blood pump drive units can only be assembled by first installing the shaft onto the housing assembly and then installing the impeller onto the shaft. This makes it difficult to ensure the coaxiality of the shaft and impeller, increasing assembly difficulty, resulting in lower production efficiency and yield of the drive unit and blood pump, and affecting their reliability. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the blood pump according to the first embodiment;

[0023] Figure 2 for Figure 1 A partial cross-sectional view of the blood pump shown;

[0024] Figure 3 for Figure 2 Enlarged schematic diagram of section I;

[0025] Figure 4 for Figure 1 The blood pump shown omits an exploded view of the catheter;

[0026] Figure 5 for Figure 1 The diagram shows the structure of the blood pump's bushing.

[0027] Figure 6 for Figure 1 A schematic diagram of the rotating components of the blood pump is shown.

[0028] Figure 7 for Figure 6 A schematic diagram of the rotating head of the rotating component shown;

[0029] Figure 8 for Figure 1 The diagram shows the structure of the rotor and stator of the blood pump.

[0030] Figure 9 for Figure 8Another structural schematic view of the rotor and the stator shown;

[0031] Figure 10 A structural schematic view of the rotating head of the driving device of the blood pump of the second embodiment;

[0032] Figure 11 A sectional view of the rotating head and the shaft sleeve of the driving device of the blood pump of the second embodiment;

[0033] Figure 12 A partial sectional view of the blood pump of the third embodiment;

[0034] Figure 13 A structural schematic view of the stator of the driving device of the blood pump of the fourth embodiment;

[0035] Figure 14 A structural schematic view of the stator and the rotor of the driving device of the blood pump of the fifth embodiment;

[0036] Figure 15 A partial sectional view of the blood pump of the sixth embodiment. DETAILED DESCRIPTION

[0037] For the purpose of promoting the understanding of the present application, the present application will be more fully described by reference to the following drawings. The preferred embodiments of the present application are shown in the drawings. However, the present application can be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. It should be noted that the present application is not limited to the embodiments described herein but can be practiced with modification and alteration within the scope of the present application.

[0038] It should be noted that when an element is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can also be present. The terms "inner", "outer", "left", "right", and the like as used herein are used for illustration only and are not intended to be limiting.

[0039] In this document, "proximal" refers to the end of the device closer to the operator; "distal" refers to the end of the device further from the operator.

[0040] Referring to Figure 1 One embodiment provides a blood pump 1, which comprises a driving device 20, a cannula assembly 30, an impeller 40 and a catheter 50. The cannula assembly 30 is connected to the distal end of the driving device 20, the catheter 50 is connected to the proximal end of the driving device 20, the impeller 40 is rotatably arranged in the cannula assembly 30, the impeller 40 is drivingly connected to the driving device 20, and the driving device 20 can drive the impeller 40 to rotate to realize the blood pumping function of the blood pump 1.

[0041] Specifically, the cannula assembly 30 has an inlet 31 and an outlet 32. The outlet 32 is closer to the drive device 20 than the inlet 31. That is, the outlet 32 is located at the proximal end of the cannula assembly 30, and the inlet 31 is located at the distal end of the cannula assembly 30. Specifically, the outlet 32 is located on the side wall of the cannula assembly 30. In one embodiment, the cannula assembly 30 extends through a heart valve, such as an aortic valve, and the inlet 31 is located in the heart, and the outlet 32 and the drive device 20 are located in a blood vessel outside the heart, such as the aorta. When the impeller 40 rotates, blood flows into the cannula assembly 30 from the inlet 31, and then flows out of the cannula assembly 30 from the outlet 32 to enter the blood vessel such as the aorta.

[0042] In some embodiments, the cannula assembly 30 includes a tube body 33 and a plurality of spaced apart tabs 34 extending from one end of the tube body 33 along the axis of the tube body 33, the outlet 32 is formed between adjacent two tabs 34, the drive device 20 is provided with a recess 21, and the end of the tab 34 away from the tube body 33 is accommodated in the recess 21. In the illustrated embodiment, the number of recesses 21 is equal to the number of tabs 34, and they form a one-to-one correspondence. For a blood pump with a short axial length of the impeller 40 and a guide surface formed at the distal end of the drive device 20 to ensure the hydraulic effect at the outlet 32, the distal end of the drive device 20 is accommodated in the cannula assembly 30, and the guide surface is located in the cannula assembly 30. In order to avoid the radial diameter of the drive device 20 being too large, while ensuring the hydraulic effect at the outlet 32, the thickness of the tube wall of the end of the cannula assembly 30 for sleeving the drive device 20 is very thin, which affects the connection strength between the cannula assembly 30 and the drive device 20. By using the above-mentioned tabs 34, the tabs 34 can have a larger thickness, thereby increasing the connection strength between the cannula assembly 30 and the drive device 20.

[0043] The catheter 50 is connected to the end of the drive device 20 away from the cannula assembly 30. The catheter 50 is used to accommodate various supply lines, such as a flushing line for supplying flushing liquid into the drive device 20, a wire for supplying power to the drive device 20, a support component for supporting the catheter 50, and the like.

[0044] Please refer to Figure 2 , Figure 3 and Figure 4 , the drive device 20 includes a housing assembly 100, a rotating component 200, a rotor 300 and a stator 400.

[0045] The distal end of the housing assembly 100 is fixedly connected with the sleeve assembly 30, and the proximal end is fixedly connected with the catheter 50. The housing assembly 100 has a receiving cavity 101 and a mounting hole 102 communicating with the receiving cavity 101. The mounting hole 102 is located at the distal end of the housing assembly 100, and the receiving cavity 101 communicates with the sleeve assembly 30 through the mounting hole 102. In this way, the flushing liquid flowing into the receiving cavity 101 from the flushing pipeline can flow out of the housing assembly 100 from the mounting hole 102, enter the sleeve assembly 30, and flow out of the liquid outlet 32.

[0046] Please combine Figure 5 The mounting hole 102 has a concave spherical wall 103. The mounting hole 102 has a first opening 102a and a second opening 102b opposite to the first opening 102a. The first opening 102a communicates with the receiving cavity 101, and the second opening 102b communicates with the outside. Specifically, the second opening 102b is located at the distal end of the housing assembly 100, and the second opening 102b communicates with the sleeve assembly 30. The diameter of the mounting hole 102 gradually increases from the first opening 102a to the second opening 102b. In the illustrated embodiment, the concave spherical wall 103 extends from the first opening 102a to the second opening 102b of the mounting hole 102. The housing assembly 100 also has a communication hole 104 communicating the mounting hole 102 and the receiving cavity 101. The diameter of the mounting hole 102 gradually increases away from the communication hole 104, so that the flushing liquid entering the receiving cavity 101 can enter the mounting hole 102 from the communication hole 104. Specifically, the first opening 102a of the mounting hole 102 is also an opening of the communication hole 104.

[0047] Specifically, the housing assembly 100 includes a housing 110 and a shaft sleeve 120. The housing 110 is generally cylindrical. The distal end of the housing 110 is fixedly connected with the sleeve assembly 30, and the proximal end is fixedly connected with the catheter 50. The receiving cavity 101 is provided in the housing 110. The housing 110 also has a communication port 111 communicating with the receiving cavity 101. The communication port 111 is located at the distal end of the housing 110, i.e. the communication port 111 is located at one end of the housing 110 close to the impeller 40 or the sleeve assembly 30. The shaft sleeve 120 is installed in the receiving cavity 101, and the mounting hole 102 is provided on the shaft sleeve 120. The shaft sleeve 120 has an outer surface 122 flush with the plane where the communication port 111 is located. The plane where the second opening 102b of the mounting hole 102 is located is flush with the outer surface 122 of the shaft sleeve 120. The communication hole 104 is also located on the shaft sleeve 120. Specifically, the shaft sleeve 120 and the housing 110 can be fixedly connected by bonding, welding or the like; or the shaft sleeve 120 and the housing 110 are integrally formed.

[0048] Please combine Figure 6The rotating component 200 is rotatably mounted to the housing assembly 100. The rotating component 200 is partially received in the accommodating cavity 101, partially located in the mounting hole 102, and partially located outside the accommodating cavity 101 and the mounting hole 102 and fixedly connected to the impeller 40, so that the rotating component 200 can drive the impeller 40 to rotate. The rotating component 200 comprises a rotating shaft 210 and a rotating head 220 fixedly connected to the rotating shaft 210.

[0049] The rotating shaft 210 is rotatably mounted to the housing assembly 100 and has a connecting segment 211 for connecting to the impeller 40. The connecting segment 211 is located outside the housing assembly 100. Specifically, the rotating shaft 210 is rotatably arranged in the communication hole 104. The maximum diameter of the rotating shaft 210 is smaller than the diameter of the communication hole 104 and the diameter of the first opening 102a of the mounting hole 102, so that the rotating component 200 can be assembled to the housing assembly 100 from the direction of the second opening 102b of the mounting hole 102 to the first opening 102a.

[0050] Please refer to the combination of Figure 7 The rotating head 220 is rotatably arranged in the mounting hole 102. The rotating head 220 has a convex spherical surface 222 which protrudes away from the connecting segment 211 along the axis of the rotating shaft 210 and can abut against the concave spherical surface wall 103. The convex spherical surface 222 is matched with the concave spherical surface wall 103 in shape and size. In the illustrated embodiment, the rotating head 220 is substantially in the shape of a spherical platform. The axis of the rotating head 220 coincides with the axis of the rotating shaft 210. The width of the rotating head 220 in the direction perpendicular to the axial direction of the rotating shaft 210 is smaller than the diameter of the second opening 102b of the mounting hole 102.

[0051] Specifically, the rotating head 220 further has a bottom surface 223 connected with the convex spherical surface 222, the bottom surface 223 is arranged towards the impeller 40. When the convex spherical surface 222 abuts against the concave spherical surface wall 103, the bottom surface 222 is flush with the plane where the second opening 102b of the mounting hole 102 is located. In other words, the bottom surface 223 of the rotating head 220 is flush with the outer surface 122 of the shaft sleeve 120. The bottom surface 223 is circular; the diameter of the bottom surface 223 is smaller than the caliber of the first opening 102a of the mounting hole 102. The ratio of the caliber of the first opening 102a of the mounting hole 102 to the diameter of the bottom surface 223 of the rotating head 220 is 0.3 to 0.6. If the caliber of the first opening 102a of the mounting hole 102 is too large, the contact area between the convex spherical surface 222 of the rotating head 220 and the concave spherical surface wall 103 of the mounting hole 102 is reduced (causing the force receiving area to be reduced), which increases the wear of the convex spherical surface 222 and the concave spherical surface wall 103; if the caliber of the first opening 102a of the mounting hole 102 is too small, the amount of flushing liquid entering the mounting hole 102 from the first opening 102a is affected, and the flushing liquid entering the mounting hole 102 is used to prevent blood in the cannula assembly 30 from entering the accommodation cavity 101, and the flushing liquid enters between the convex spherical surface 222 and the concave spherical surface wall 103 to play a lubricating role, so as to reduce the friction coefficient between the rotating head 220 and the concave spherical surface wall 103 of the mounting hole 102. The above ratio can make the convex spherical surface 222 of the rotating head 220 and the concave spherical surface wall 103 of the mounting hole 102 have less wear, and at the same time have a suitable flow of flushing liquid.

[0052] In order to prevent blood in the cannula assembly 30 from entering the mounting hole 102 through the second opening 102b of the mounting hole 102, the gap between the second opening 102b of the mounting hole 102 and the rotating head 220 is preferably less than or equal to 2 microns, and in order to make the flushing liquid have a reasonable flow and flow rate at the second opening 102b of the mounting hole 102, the difference between the caliber of the communication hole 104 and the diameter of the part of the rotating shaft 210 located in the communication hole 104 is greater than 4 microns.

[0053] In the illustrated embodiment, the hole wall of the communication hole 104 is partially recessed to form a drainage groove 105 extending along the axis of the communication hole 104, the drainage groove 105 is in communication with the accommodation cavity 101 and the mounting hole 102, so that the flow of flushing liquid into the mounting hole 102 can be increased. Compared with directly increasing the caliber of the communication hole 104, the way of opening the drainage groove 105 on the hole wall of the communication hole 104 to increase the flow of flushing liquid can make the concave spherical surface wall 103 of the mounting hole 102 have a larger area, so that the concave spherical surface wall 103 and the convex spherical surface 222 of the rotating head 220 have a larger contact area to share the pressure of the rotating head 220 on the concave spherical surface wall 103, thereby reducing the wear of the concave spherical surface wall 103 and the rotating head 220.

[0054] In the illustrated embodiment, the rotating head 220 further has a top surface 225 which is spaced apart and parallel to the bottom surface 223 along the axis of the rotating shaft 210, the diameter of the top surface 225 is smaller than that of the bottom surface 223, and the convex spherical surface 222 connects the top surface 225 and the bottom surface 223 so as to form a spherical platform structure together. The rotating shaft 210 penetrates the top surface 225 and the bottom surface 223 of the rotating head 220, and the axis of the rotating shaft 210 is perpendicular to the top surface 225 and the bottom surface 223 of the rotating head 220. The diameter of the top surface 225 of the rotating head 220 is smaller than the caliber of the first opening 102a of the mounting hole 102, so that the rotating head 220 is partially located outside the mounting hole 102 or in other words, the rotating head 220 is partially located in the communication hole 104, so as to ensure the contact area of the convex spherical surface 222 of the rotating head 220 and the concave spherical surface wall 103 of the mounting hole 102 as much as possible, and avoid the contact of the joint of the top surface 225 and the convex spherical surface 222 of the rotating head 220 with the concave spherical surface wall 103 of the mounting hole 102 due to the included angle, thereby effectively reducing the wear of the rotating head 220 and the concave spherical surface wall 103 of the mounting hole 102.

[0055] In the illustrated embodiment, the rotating shaft 210 further has a limiting surface 213, and the top surface 225 of the rotating head 220 abuts against the limiting surface 213, so as to position the rotating head 220 on the rotating shaft 210, thereby facilitating the installation and positioning of the rotating head 220. Specifically, the rotating head 220 is provided with a through hole 226 which penetrates the top surface 225 and the bottom surface 223 of the rotating head 220, the central axis of the through hole 226 is perpendicular to the top surface 225 and the bottom surface 223, the central axis of the through hole 226 passes the center of the circle on which the top surface 225 lies, and also passes the center of the circle on which the bottom surface 223 lies, and the rotating shaft 210 penetrates the through hole 226. The hole wall of the through hole 226 is provided with a glue groove 227 which is used to fill adhesive to fixedly connect the rotating head 220 and the rotating shaft 210. Specifically, the glue groove 227 extends from the top surface 225 of the rotating head 220 towards the bottom surface 223. It can be understood that in other embodiments, the rotating head 220 can be fixedly connected with the rotating shaft 210 by welding, or the rotating head 220 and the rotating shaft 210 can be integrally formed.

[0056] The rotor 300 is fixedly connected with the rotating shaft 210, and the stator 400 can drive the rotor 300 to rotate, so that the rotor 300 can drive the rotating shaft 210 to rotate, and the impeller 40 can rotate with the rotating shaft 210. The rotor 300 and the stator 400 have a magnetic force action therebetween, which can make the convex spherical surface 222 abut against the concave spherical surface wall 103.

[0057] Please combine Figure 2 , Figure 4 , Figure 8 and Figure 9In the illustrated embodiment, the rotor 300 comprises a first rotor unit 310 and a second rotor unit 320, both of which are fixed to the rotating shaft 210. The first rotor unit 310 and the second rotor unit 320 are accommodated in the accommodating cavity 101. The rotating head 220, the first rotor unit 310, the stator 400 and the second rotor unit 320 are sequentially arranged along the axis of the rotating shaft 210. Specifically, the first rotor unit 310 is located between the shaft sleeve 120 and the stator 400. The stator 400 can drive the first rotor unit 310 and the second rotor unit 320 to rotate. The stator 400 and the first rotor unit 310 have a first attractive force, and the stator 400 and the second rotor unit 320 have a second attractive force. The first attractive force is greater than the second attractive force. Under the combined action of the first attractive force and the second attractive force, the convex spherical surface 222 abuts against the concave spherical surface wall 103. That is, the magnetic force acting on the rotor 300 by the stator 400 is the resultant force of the first attractive force and the second attractive force, and is directed away from the connecting section 211 of the rotating shaft 210, so that the rotating component 200 is subjected to a force directed away from the connecting section 211 of the rotating shaft 210. This force causes the convex spherical surface 222 to abut against the concave spherical surface wall 103.

[0058] Specifically, the first rotor unit 310 and the second rotor unit 320 are both magnetic, and the stator 400 can generate a rotating magnetic field to drive the first rotor unit 310 and the second rotor unit 320 to rotate. In one embodiment, the attractive force between the first rotor unit 310 and the stator 400 is equal to the attractive force between the second rotor unit 320 and the stator 400 when the distance between them is equal. The first rotor unit 310 and the second rotor unit 320 have the same structure. In the illustrated embodiment, the distance between the first rotor unit 310 and the stator 400 is less than the distance between the second rotor unit 320 and the stator 400, so that the first attractive force is greater than the second attractive force.

[0059] The first rotor unit 310 comprises a first magnet 311 fixed to the rotating shaft 210. The first magnet 311 is a ring-shaped Halbach array magnet. The first magnet 311 comprises a plurality of first magnetic units 3111. Each first magnetic unit 3111 is in the shape of a sector ring, and the plurality of first magnetic units 3111 are arranged around the rotating shaft 210 for one revolution to form a ring structure. Specifically, the number of first magnetic units 3111 is four, six, eight or ten, etc.

[0060] The first rotor unit 310 further comprises a first flywheel 312, the first flywheel 312 is fixedly connected to the rotating shaft 210, and the first magnet 311 is fixedly connected to the first flywheel 312. By arranging the first flywheel 312, the connection strength of the first magnet 311 and the rotating shaft 210 can be enhanced; in addition, the shaking of the rotating shaft 210 during rotation can be reduced, so that the entire rotating shaft 210 is more stable during rotation.

[0061] Specifically, the first flywheel 312 comprises a first built-in pipe 3121, a first disc-shaped part 3122 and a first outer ring wall 3123. The first built-in pipe 3121 and the first outer ring wall 3123 are both circular pipe structures, and the first disc-shaped part 3122 is an annular disc structure. The first built-in pipe 3121 and the first outer ring wall 3123 are both fixedly connected with the first disc-shaped part 3122. The first outer ring wall 3123 is arranged around the first disc-shaped part 3122, and the first built-in pipe 3121 and the first outer ring wall 3123 are coaxially arranged. The rotating shaft 210 is arranged in the first built-in pipe 3121 and fixedly connected with the first built-in pipe 3121. A first mounting cavity is formed between the first built-in pipe 3121 and the first outer ring wall 3123. The first magnet 311 is accommodated in the first mounting cavity. The shape of the first mounting cavity is matched with the first magnet 311 to facilitate the installation and positioning of the first magnet 311. In this way, the first flywheel 312 can limit the first magnet 311, which not only facilitates the installation of the first magnet 311, but also makes the combination of the first magnet 311 and the first flywheel 312 more stable.

[0062] It should be noted that the first flywheel 312 is not limited to the above structure. In some embodiments, the first flywheel 312 does not have the first outer ring wall 3123. In some embodiments, the first flywheel 312 does not have the first outer ring wall 3123 and the first built-in pipe 3121, and at this time, the rotating shaft 210 is fixedly arranged in the center of the first disc-shaped part 3122. Compared with the first flywheel 312 only having the first disc-shaped part 3122, the first built-in pipe 3121 can make the first flywheel 312 more stably connected with the rotating shaft 210.

[0063] The second rotor unit 320 comprises a second magnet 321, and the second magnet 321 is fixedly connected to the rotating shaft 210. Specifically, the second magnet 321 is a ring-shaped Halbach array magnet. The structure of the second magnet 321 is substantially the same as that of the first magnet 311. The second magnet 321 comprises a plurality of second magnetic units 3211, each second magnetic unit 3211 is in the shape of a fan ring, and the plurality of second magnetic units 3211 are arranged around the rotating shaft 210 for one turn to form a ring-shaped structure of the second magnet 321. Specifically, the number of second magnetic units 3211 is four, six, eight or ten, etc.

[0064] The second rotor unit 320 further comprises a second flywheel 322 fixed to the rotating shaft 210, and the second magnet 321 is fixed to the second flywheel 322. The second flywheel 322 can enhance the connection strength between the second magnet 321 and the rotating shaft 210, and can also reduce the shaking of the rotating shaft 210 during rotation, so that the rotating shaft 210 is more stable during rotation.

[0065] The second flywheel 322 comprises a second built-in pipe 3221, a second disc-shaped part 3222 and a second outer ring wall 3223. The second built-in pipe 3221 and the second outer ring wall 3223 are both in the structure of a circular pipe, and the second disc-shaped part 3222 is in the structure of a ring-shaped disc. The second built-in pipe 3221 and the second outer ring wall 3223 are both fixed to the second disc-shaped part 3222. The second outer ring wall 3223 surrounds the second disc-shaped part 3222, and the second built-in pipe 3221 and the second outer ring wall 3223 are coaxially arranged. The rotating shaft 210 is arranged in the second built-in pipe 3221 and is fixedly connected to the second built-in pipe 3221. The second built-in pipe 3221 and the second outer ring wall 3223 form a second mounting cavity therebetween. The second magnet 321 is arranged in the second mounting cavity. The shape of the second mounting cavity is matched with the second magnet 321 to facilitate the installation and positioning of the second magnet 321. In this way, the second flywheel 322 can limit the second magnet 321, which facilitates the installation of the second magnet 321 and makes the combination of the second magnet 321 and the second flywheel 322 more stable.

[0066] It should be noted that the second flywheel 322 is not limited to the above structure. In some embodiments, the second flywheel 322 does not have the second outer ring wall 3223. In some embodiments, the second flywheel 322 does not have the second outer ring wall 3223 and the second built-in pipe 3221, and in this case, the rotating shaft 210 is fixedly arranged in the center of the second disc-shaped part 3222. Compared with the second flywheel 322 having only the second disc-shaped part 3222, the second built-in pipe 3221 can make the second flywheel 322 more stably connected to the rotating shaft 210.

[0067] Referring to Figure 2 and Figure 4 In some embodiments, the stator 400 comprises a plurality of magnetic cores 410 and a plurality of coils 420. The plurality of magnetic cores 410 are arranged at intervals along a circle, and the plurality of coils 420 are respectively wound on the plurality of magnetic cores 410. Specifically, the extension direction of each magnetic core 410 is consistent with the extension direction of the rotating shaft 210. The rotating shaft 210 is rotatably arranged in the stator 400, and the plurality of magnetic cores 410 are arranged around the rotating shaft 210.

[0068] In the illustrated embodiment, the magnetic core 410 is substantially columnar, and the cross-sectional dimension of the magnetic core 410 remains constant in the extension direction of the magnetic core 410. The first rotor unit 310 and the second rotor unit 320 are respectively arranged close to two ends of the magnetic core 410. More specifically, the first magnet 311 of the first rotor unit 310 is arranged close to one end of the magnetic core 410, and the second magnet 321 of the second rotor unit 320 is arranged close to the other end of the magnetic core 410, so that the magnetic core 410 can simultaneously generate magnetic coupling with the first magnet 311 and the second magnet 321, thereby enabling the stator 400 to simultaneously drive the first rotor unit 310 and the second rotor unit 320 to rotate.

[0069] The cross-sectional shape of the magnetic core 410 is substantially triangular prism, and each edge of the magnetic core 410 faces the axis of the rotation shaft 210. For example, the edges of the magnetic core 410 are rounded, i.e., the edges of the magnetic core 410 are relatively smooth and blunt, so as to eliminate sharp edges on the magnetic column, which not only facilitates subsequent winding of the coil 420, but also facilitates protection of the insulation material wrapped on the coil 420. For another example, the cross-sectional shape of the magnetic core 410 can also be fan-shaped, circular, trapezoidal, fan ring-shaped, etc.

[0070] It can be understood that the structure of the magnetic core 410 is not limited to the above structure, and in other embodiments, each magnetic core 410 includes a magnetic column and a head (i.e., a pole shoe) arranged on the magnetic column, the head is two, the head is arranged on both ends of the magnetic column, the extension direction of the magnetic column is consistent with the extension direction of the rotation shaft 210, and the coil 420 is wound on the magnetic column of each magnetic core 410. In the extension direction of the magnetic column, the cross-sectional dimension of the magnetic column remains constant, in a colloquial sense, the magnetic column is uniform in thickness. At this time, the first rotor unit 310 and the second rotor unit 320 are respectively arranged close to the two heads.

[0071] And Figure 2 , Figure 4 , Figure 8 and Figure 9 The columnar magnetic core 410 shown in FIG. 8 does not have a head (i.e., a pole shoe) with a relatively large width, at this time, the entire magnetic core 410 can be magnetically coupled with the rotor 300, compared with the magnetic core 410 with the head, the magnetic core 410 with only the columnar shape can reduce magnetic loss on the one hand, increase the magnetic coupling density between the magnetic core 410 and the rotor 300, and increase the torque of the stator 400 on the rotor 300 under the same current. On the other hand, the magnetic core 410 without the head can also greatly reduce the problem of power reduction of the driving device 20 caused by local magnetic short circuit due to contact between adjacent magnetic cores 410.

[0072] Specifically, the material of the magnetic core 410 is a material with magnetism, such as silicon steel. Therefore, the magnetic core 410 has an attractive force between the first magnet 311 and the second magnet 321, that is, an attractive force between the stator 400 and the first rotor unit 310, and an attractive force between the stator 400 and the second rotor unit 320.

[0073] Specifically, the stator 400 further comprises a positioning piece 430, the positioning piece 430 is fixedly connected with the plurality of magnetic cores 410, and the positioning piece 430 separates the adjacent magnetic cores 410 to prevent the adjacent magnetic cores 410 from contacting. The material of the positioning piece 430 is polyether ether ketone or ceramic. Both polyether ether ketone and ceramic are non-conductive and non-magnetic materials, which do not affect the performance of the stator 400. In addition, polyether ether ketone has the advantages of hydrolysis resistance, dimensional stability, electrical properties and insulation properties, while ceramic has high biocompatibility, mechanical strength, and good wear resistance and corrosion resistance.

[0074] Specifically, the housing assembly 100 further comprises a support 130, the support 130 is a shaft sleeve or a bearing, the support 130 is installed in the accommodation cavity 101 and is fixedly connected with the shell 110, and one end of the rotating shaft 210 away from the connecting section 211 is installed on the support 130. Specifically, the rotor 300 and the stator 400 are located between the shaft sleeve 120 and the support 130. In the illustrated embodiment, the support 130 is a shaft sleeve.

[0075] In the illustrated embodiment, the housing assembly 100 further comprises a fixing piece 140, the fixing piece 140 is installed in the accommodation cavity 101, the fixing piece 140 has a mounting cavity 142 and a fluid passage communicating with the mounting cavity 142, the support 130 is fixedly received in the mounting cavity 142, and the fluid passage is used to communicate with the flushing pipeline.

[0076] The above-mentioned drive device 20 and blood pump 1 have at least the following advantages:

[0077] In the above-mentioned drive device 20 and blood pump 1, the mounting hole 102 of the housing assembly 100 has a concave spherical wall 103, and the rotating head 220 fixedly connected with the rotating shaft 210 has a convex spherical surface 222 protruding in a direction away from the rotating shaft 210 along the axis of the rotating shaft 210 and towards the connecting section 211 used to connect the impeller 40. The magnetic force between the rotor 300 and the stator 400 makes the convex spherical surface 222 abut against the concave spherical wall 103, which not only realizes the axial positioning of the rotating shaft 210, but also realizes the radial positioning of the rotating shaft 210, so that the structure of the drive device 20 is more simple and compact, and the assembly difficulty of the drive device 20 is greatly reduced.

[0078] Since the convex spherical surface 222 of the rotating head 220 is convex in a direction away from the connecting section 211 of the rotating shaft 210 along the axis of the rotating shaft 210 for connecting the impeller 40, and the concave spherical surface wall 103 of the mounting hole 102 is configured to abut against the convex spherical surface 222, the concave spherical surface wall 103 of the mounting hole 102 is concave in a direction from the outside to the inside of the accommodating cavity 101 of the housing assembly 100. In this way, when assembling the driving device 20, the impeller 40 can be first fixed to the rotating shaft 210 before the rotating shaft 210 is installed to the housing assembly 100, so that the coaxiality of the impeller 40 and the rotating shaft 210 can be directly detected and adjusted, and then the rotating shaft 210 with the fixed impeller 40 is assembled to the housing assembly 100 from the mounting hole 102. In this way, the rotating shaft 210 and the impeller 40 of the driving device 20 have higher coaxiality, which is beneficial to reduce the assembly difficulty, improve the production efficiency and yield of the driving device 20 and the blood pump 1, and improve the reliability of the driving device 20 and the blood pump 1. However, in the conventional blood pump, the convex spherical surface 222 is convex in a direction close to the connecting section 211 of the rotating shaft 210, and the concave spherical surface wall 103 is concave in a direction close to the connecting section 211 of the rotating shaft 210. Therefore, the rotating shaft 210 must be first installed to the housing assembly 100, and then the impeller 40 is installed to the rotating shaft 210. In this way, it is difficult to ensure the coaxiality of the rotating shaft 210 and the impeller 40, which increases the assembly difficulty, reduces the production efficiency and yield of the driving device and the blood pump, and affects the reliability of the driving device and the blood pump.

[0079] As shown in FIGS. 1 and 2, the driving device 20 of the blood pump 1 comprises a rotating shaft 210 and a housing assembly 100. Figure 10 and Figure 11 The driving device of the blood pump of the second embodiment is substantially the same as the driving device 20 of the first embodiment, and the difference lies in the structure of the rotating head 220.

[0080] The partial concave of the convex spherical surface 222 of the rotating head 220 forms a flow guide groove 224, which extends from the bottom surface 223 of the rotating head 220 along the convex spherical surface 222 in a direction away from the bottom surface 223 and is communicated to the accommodating cavity of the housing assembly through the communication hole 104. Specifically, the flow guide groove 224 extends from the bottom surface 224 to the top surface 225 along the convex spherical surface 222.

[0081] The flow guide groove 224 is beneficial to improve the smoothness of the flushing liquid flow. At the same time, the flow guide groove 224 can also make the flushing liquid better enter between the concave spherical surface wall 103 of the mounting hole 102 and the convex spherical surface 222 of the rotating head 220 to play a lubricating role, so as to reduce the wear between the concave spherical surface wall 103 of the mounting hole 102 and the convex spherical surface 222 of the rotating head 220.

[0082] And since the driving device of the second embodiment is substantially the same as the driving device 20 of the first embodiment, it also has similar effects as the driving device 20 of the first embodiment, which will not be repeated here.

[0083] As shown in Figure 12 , the driving device of the blood pump of the third embodiment is substantially the same as the driving device 20 of the first embodiment, except that the structure of the rotating component 200 is different.

[0084] In the present embodiment, one end of the connecting section 211 of the rotating shaft 210 is fixedly connected to the bottom surface 223 of the rotating head 220, and the axis of the connecting section 211 passes through the center of the bottom surface 223 of the rotating head 220 and is perpendicular to the bottom surface 223. The rotating shaft 210 further comprises an embedded section 212 which is separate from the connecting section 211, and the embedded section 212 is coaxially arranged with the connecting section 211, and the embedded section 212 is fixedly connected to the rotating head 220.

[0085] In the illustrated embodiment, the rotating head 220 is provided with an assembly hole 228 extending from the top surface 225 to the bottom surface 223 of the rotating head 220, and the center axis of the assembly hole 228 passes through the center of the top surface 225 and the center of the bottom surface 223. That is, in the present embodiment, the assembly hole 228 replaces the through hole 226 shown in Figure 3 . One end of the embedded section 212 is received in the assembly hole 228, and the other end extends into the accommodation cavity 101, for example, is mounted on the support.

[0086] And since the driving device of the third embodiment is substantially the same as the driving device 20 of the first embodiment, it also has similar effects as the driving device 20 of the first embodiment, which will not be repeated here.

[0087] The driving device of the blood pump of the fourth embodiment is substantially the same as the driving device 20 of the first embodiment, except that the structure of the stator is different.

[0088] As shown in Figure 13 , in the present embodiment, the stator 500 comprises a first stator unit 510, a second stator unit 520 and a magnetic conducting member 530, and the first stator unit 510, the magnetic conducting member 530 and the second stator unit 520 are sequentially arranged along the axis of the rotating shaft.

[0089] The first stator unit 510, the second stator unit 520 and the magnetic conducting member 530 are all located Figure 4 and Figure 8The first stator unit 510 is arranged close to the first rotor unit 310, and the second stator unit 520 is arranged close to the second rotor unit 320; the first stator unit 510 can drive the first rotor unit 310 to rotate, and the second stator unit 520 can drive the second rotor unit 320 to rotate. The first stator unit 510 and the first rotor unit 310 have a first attractive force, and the second stator unit 520 and the second rotor unit 320 have a second attractive force.

[0090] The first stator unit 510 and the second stator unit 520 have substantially the same structure as the stator 400 shown in the figure, the first stator unit 510 has a first magnetic core 511 and a first coil 512, the first coil 512 is wound on the first magnetic core 511, the second stator unit 520 has a second magnetic core 521 and a second coil 522 wound on the second magnetic core 521, the first magnetic core 511 and the second magnetic core 521 can have a head respectively, or can not have a head, the difference is that the first stator unit 510 and the second stator unit 520 are not arranged with the positioning member 430 shown in the figure. Figure 4 The first stator unit 510 and the second stator unit 520 have substantially the same structure as the stator 400 shown in the figure, the first stator unit 510 has a first magnetic core 511 and a first coil 512, the first coil 512 is wound on the first magnetic core 511, the second stator unit 520 has a second magnetic core 521 and a second coil 522 wound on the second magnetic core 521, the first magnetic core 511 and the second magnetic core 521 can have a head respectively, or can not have a head, the difference is that the first stator unit 510 and the second stator unit 520 are not arranged with the positioning member 430 shown in the figure. Figure 4 The first stator unit 510 and the second stator unit 520 have substantially the same structure as the stator 400 shown in the figure, the first stator unit 510 has a first magnetic core 511 and a first coil 512, the first coil 512 is wound on the first magnetic core 511, the second stator unit 520 has a second magnetic core 521 and a second coil 522 wound on the second magnetic core 521, the first magnetic core 511 and the second magnetic core 521 can have a head respectively, or can not have a head, the difference is that the first stator unit 510 and the second stator unit 520 are not arranged with the positioning member 430 shown in the figure.

[0091] The first magnetic core 511 of the first stator unit 510 and the second magnetic core 521 of the second stator unit 520 are fixedly connected with the magnetic conducting member 530. If the first magnetic core 511 has a head, the end of the first magnetic core 511 away from the head is fixedly connected with the magnetic conducting member 530, and the first rotor unit 310 is arranged close to the head of the first magnetic core 511; if the second magnetic core 521 has a head, the end of the second magnetic core 521 away from the head is fixedly connected with the magnetic conducting member 530, and the second rotor unit 320 is arranged close to the head of the second magnetic core 521. If the first magnetic core 511 has no head, one end of the first magnetic core 511 is fixedly connected with the magnetic conducting member 530, and the first rotor unit 310 is arranged close to the other end of the first magnetic core 511; if the second magnetic core 521 has no head, one end of the second magnetic core 521 is fixedly connected with the magnetic conducting member 530, and the second rotor unit 320 is arranged close to the other end of the second magnetic core 521.

[0092] The magnetic conductive member 530 functions to close the magnetic circuit, so as to facilitate and increase the generation of magnetic flux, and improve the coupling capacity. Therefore, the first magnetic core 511 of the first stator unit 510 and the second magnetic core 521 of the second stator unit 520 are both fixedly connected with the magnetic conductive member 530, which can function to close the magnetic circuit between the first stator unit 510 and the first rotor unit 310, and close the magnetic circuit between the second stator unit 520 and the second rotor unit 320, so as to increase the magnetic flux. Therefore, the arrangement of the magnetic conductive member 530 is beneficial to reduce the overall diameter of the driving device 20. In addition, the first magnetic core 511 of the first stator unit 510 and the second magnetic core 521 of the second stator unit 520 are both fixedly connected with the magnetic conductive member 530, which can also realize the positioning and installation of the first stator unit 510 and the second stator unit 520, and reduce the assembly difficulty of the first stator unit 510 and the second stator unit 520. In order to facilitate the fixation of the stator 500 in the housing assembly, a clamping groove matched with the magnetic conductive member 530 can be arranged in the shell of the housing assembly, and the overall fixation of the stator 500 can be realized by clamping the magnetic conductive member 530 through the clamping groove. Therefore, the magnetic conductive member 530 arranged in the above manner can also reduce the arrangement of the positioning structure in the housing assembly, so as to simplify the structure of the housing assembly and the assembly process of the entire driving device.

[0093] Specifically, the magnetic conductive member 530 includes a first magnetic conductive plate portion 531 and a second magnetic conductive plate portion 532. The first magnetic conductive plate portion 531 is fixedly connected with the first magnetic core 511 of the first stator unit 510, and the second magnetic conductive plate portion 532 is fixedly connected with the second magnetic core 521 of the second stator unit 520. The first magnetic conductive plate portion 531 and the second magnetic conductive plate portion 532 are laminated, i.e., the mutually close faces of the first magnetic conductive plate portion 531 and the second magnetic conductive plate portion 532 abut against each other. The rotating shaft is rotatably arranged in the first magnetic conductive plate portion 531 and the second magnetic conductive plate portion 532.

[0094] Specifically, the first magnetic conductive plate portion 531 and the second magnetic conductive plate portion 532 are fixedly connected, so that the first stator unit 510, the second stator unit 520 and the magnetic conductive member 530 form an integral whole and are assembled into the shell, so that the assembly of the stator 500 is more convenient.

[0095] Specifically, the first magnetic conducting plate part 531 and the second magnetic conducting plate part 532 are welded or bonded, in other words, the first magnetic conducting plate part 531 and the second magnetic conducting plate part 532 are two independent parts before assembly, by setting the magnetic conducting part 530 as the first magnetic conducting plate part 531 and the second magnetic conducting plate part 532 which are split before assembly, when assembling the driving device, the first magnetic core 511 can be fixed to the first magnetic conducting plate part 531, and the second magnetic core 521 can be fixed to the second magnetic conducting plate part 532, then the first magnetic conducting plate part 531 and the second magnetic conducting plate part 532 are fixed in layers, in this way, the first magnetic core 511 and the second magnetic core 521 can be conveniently assembled to the first magnetic conducting plate part 531 and the second magnetic conducting plate part 532 respectively, and the assembly of the first magnetic core 511 and the second magnetic core 521 is more convenient.

[0096] It should be noted that the material of the first magnetic conducting plate part 531 and the second magnetic conducting plate part 532 is silicon steel, and the material of the first magnetic core 511 and the second magnetic core 521 is silicon steel. The magnetic conducting part 530 is not limited to the above-mentioned combination of the first magnetic conducting plate part 531 and the second magnetic conducting plate part 532 which are split before assembly, in some embodiments, the first magnetic conducting plate part 531 and the second magnetic conducting plate part 532 are not fixed together, but are stacked together; in some embodiments, the magnetic conducting part 530 can also be a one-piece plate structure, and the first magnetic core 511 and the second magnetic core 521 are connected to the magnetic conducting part 530, that is, the first stator unit 510 and the second stator unit 520 share one magnetic conducting part 530.

[0097] Since the structure of the driving device of the fourth embodiment is substantially the same as that of the driving device 20 of the first embodiment, it also has similar effects to the driving device 20 of the first embodiment, which will not be described here.

[0098] The structure of the driving device of the blood pump of the fifth embodiment is substantially the same as that of the driving device 20 of the first embodiment, and the difference lies in that the structure of the rotor is slightly different.

[0099] As shown in Figure 14 , in the present embodiment, the rotor 600 has one rotor unit, and the structure of the rotor 600 is the same as that of the first rotor unit 310 in the Figure 2 、 Figure 4 、 Figure 8 and Figure 9 . Along the axis of the rotating shaft, the rotor 600 is located between the rotating head and the stator 700, or in other words, the rotor 600 is located between the shaft sleeve and the stator 700, and there is an attractive force between the rotor 600 and the stator 700, under the action of the attractive force, the convex spherical surface of the rotating head abuts against the concave spherical surface wall of the mounting hole.

[0100] In the illustrated embodiment, the structure of the stator 700 is the same as that of the Figure 2 ,Figure 4 , Figure 8 and Figure 9 The structure of the stator 400 is the same. It is understandable that the structure of the stator 700 could also be different. Figure 2 , Figure 4 , Figure 8 and Figure 9 In some embodiments, the stator 400 of the stator 700 does not have the positioning element 730, but has a magnetic back plate (not shown), which is fixed to the end of the magnetic core 710 away from the rotor 600. The magnetic back plate serves to close the magnetic circuit, thereby promoting and increasing the generation of magnetic flux, improving coupling capability, and increasing magnetic flux, which is beneficial for reducing the overall diameter of the drive device. The magnetic core 710 may or may not have a head (pole shoe). When the magnetic core 710 has a head, the head is located at the end of the magnetic core 710 closer to the rotor 600.

[0101] Since the drive device of the fifth embodiment has a structure that is substantially the same as that of the drive device 20 of the first embodiment, and also has similar effects to the drive device 20 of the first embodiment, it will not be described again here.

[0102] The structure of the blood pump drive device in the sixth embodiment is roughly the same as that in the fifth embodiment, except that the structure of the rotating shaft is slightly different.

[0103] like Figure 15 As shown, in this embodiment, the end of the rotating shaft 800 furthest from the connecting section 810 is spaced apart from the stator 910, that is, the rotating shaft 800 does not pass through the stator 910, and the rotating shaft 800 is located outside the stator 910. The rotor 920 is fixed to the end of the rotating shaft 800 furthest from the connecting section 810.

[0104] The larger the cross-sectional area of ​​the magnetic core 911 of the stator 910, the greater the magnetic flux generated, the greater the torque of the stator 910 on the rotor 920, and the smaller the required current, which helps to reduce power consumption and heat generation. Since the stator 910 does not have a rotating shaft 800, the shaft 800 can avoid occupying the installation space of the magnetic core 911. This allows for increasing the cross-sectional size of the magnetic core 911 to increase the driving torque of the stator 910 on the rotor 920 while keeping the outer diameter of the housing assembly 930 (specifically the outer shell) unchanged. With the same required torque, this method can reduce the current supply to the stator 910, thereby reducing power consumption. It also reduces the heat generated by the drive device, preventing the blood pump from overheating during operation and causing discomfort or even harm to the human body.

[0105] In this embodiment, similar to Figure 2 and Figure 4The support 130 and the fixing member 140 in the sixth embodiment can be omitted. Similarly, in the sixth embodiment, the structure of the stator 910 can be the same as that of the stator 400 in Figure 2 、 Figure 4 、 Figure 8 and the structure of the stator 400 in Figure 9 、 Figure 2 、 Figure 4 、 Figure 8 and Figure 9 may be different, for example, in some embodiments, the stator 910 does not have the positioning member 430 in Figure 4 and Figure 8 , but has a magnetic conductive back plate (not shown) fixed to the end of the magnetic core 911 away from the rotor 920. The magnetic conductive back plate is used to close the magnetic circuit to facilitate and increase the generation of magnetic flux, improve the coupling capacity, increase the magnetic flux, and is beneficial to reduce the overall diameter of the driving device.

[0106] Since the structure of the driving device of the sixth embodiment is substantially the same as that of the driving device of the fifth embodiment, and has similar effects to the driving device of the fifth embodiment, no further description is given here.

[0107] The technical features of the above-described embodiments can be combined in any manner. In order to make the description concise, not all possible combinations of the technical features in the above-described embodiments are described, however, as long as the combinations of the technical features do not exist contradictions, they should be considered as the scope of the present disclosure.

[0108] The above-described embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent. 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 scope of the present application. Therefore, the scope of protection of the present application should be subject to the appended claims.

Claims

1. A driving device for driving an impeller to rotate, characterized in that, The driving device includes: The housing assembly has a mounting hole with a concave spherical wall. The housing assembly also has a receiving cavity and a communicating hole connecting the mounting hole and the receiving cavity, so that flushing fluid entering the receiving cavity can enter the mounting hole through the communicating hole. A rotating component is partially housed within the receiving cavity, partially located within the mounting hole, and partially located outside the receiving cavity and the mounting hole and fixedly connected to the impeller. The rotating component includes a rotating shaft and a rotating head fixedly connected to the rotating shaft. The rotating shaft is rotatably mounted to the housing assembly and rotatably passes through the communicating hole. The rotating shaft has a connecting section located outside the housing assembly for connecting to the impeller. The rotating head is rotatably disposed in the mounting hole and has a convex spherical surface that protrudes along the axis of the rotating shaft in a direction away from the connecting section, and the convex spherical surface can abut against the concave spherical wall. The rotor is fixedly connected to the rotating shaft; and The stator is capable of driving the rotor to rotate. There is a magnetic force between the rotor and the stator. The magnetic force causes the convex spherical surface to abut against the concave spherical surface wall. The rotor and the stator are installed in the accommodating cavity.

2. The driving device according to claim 1, characterized in that, Along the axis of the rotating shaft, the rotor is located between the rotating head and the stator; there is an attractive force between the rotor and the stator, and under the action of the attractive force, the convex spherical surface abuts against the concave spherical surface wall.

3. The driving device according to claim 1, characterized in that, The rotor includes a first rotor unit and a second rotor unit. The rotating head, the first rotor unit, the stator, and the second rotor unit are arranged sequentially along the axis of the rotating shaft. The stator can drive the first rotor unit and the second rotor unit to rotate. There is a first attraction between the stator and the first rotor unit, and a second attraction between the stator and the second rotor unit. The first attraction is greater than the second attraction. Under the combined action of the first attraction and the second attraction, the convex spherical surface abuts against the concave spherical surface wall.

4. The driving device according to claim 2 or 3, characterized in that, The stator includes multiple magnetic cores, multiple coils, and positioning elements. The multiple magnetic cores are spaced apart along a circle, and the multiple coils are wound around the multiple magnetic cores respectively. The positioning elements are fixed to the multiple magnetic cores and separate adjacent magnetic cores. The material of the positioning elements is polyetheretherketone or ceramic.

5. The driving device according to claim 1, characterized in that, The mounting hole has a first opening and a second opening opposite to the first opening. The first opening communicates with the receiving cavity. From the first opening to the second opening, the diameter of the mounting hole gradually increases. The concave spherical wall extends from the first opening to the second opening. The rotating head also has a bottom surface connected to the convex spherical surface. When the convex spherical surface abuts against the concave spherical wall, the bottom surface is flush with the plane where the second opening is located.

6. The driving device according to claim 5, characterized in that, The ratio of the diameter of the first opening to the diameter of the bottom surface of the rotating head is 0.3 to 0.6; And / or, a partial depression on the convex spherical surface forms a guide groove, the guide groove extending from the bottom surface of the rotating head along the convex spherical surface in a direction away from the bottom surface, and the guide groove is in communication with the receiving cavity.

7. The driving device according to claim 1, characterized in that, Moving away from the connecting hole, the diameter of the mounting hole gradually increases, and the hole wall of the connecting hole is partially recessed to form a drainage groove extending along the axis of the connecting hole. The drainage groove is connected to both the accommodating cavity and the mounting hole.

8. The driving device according to claim 1, characterized in that, The housing assembly includes a housing and a bushing. The housing has a receiving cavity and a communication port communicating with the receiving cavity. The bushing is installed in the receiving cavity and has an outer surface flush with the plane of the communication port. A mounting hole is formed on the bushing, and the mounting hole has a first opening and a second opening opposite to the first opening. The first opening communicates with the receiving cavity, and the plane of the second opening is flush with the outer surface of the bushing.

9. The driving device according to claim 1, characterized in that, The rotating head also has a bottom surface connected to the convex spherical surface, and the rotating shaft is fixedly inserted through the rotating head. The axis of the rotating shaft passes through the center of the bottom surface and is perpendicular to the bottom surface. Alternatively, the rotating head may also have a bottom surface connected to the convex spherical surface, one end of the connecting segment may be fixed to the bottom surface, and the axis of the connecting segment may pass through the center of the bottom surface and be perpendicular to the bottom surface. The rotating shaft may also include an internal segment separate from the connecting segment, the internal segment may be coaxially arranged with the connecting segment, the internal segment may be fixed to the rotating head, and the rotor may be fixed to the internal segment.

10. A blood pump, characterized in that, It includes an impeller and a drive device according to any one of claims 1 to 9, wherein the connecting section is fixedly connected to the impeller.

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