Blood pump and drive device therefor

Abstract

This application relates to a blood pump and its driving device. The driving device includes a drive housing, a rotor, a stator assembly, and a bushing assembly. The drive housing has a communication port and a limiting portion. The rotor is rotatably mounted on the drive housing, with a portion of the rotor housed within the drive housing and a portion extending outside the drive housing and fixedly connected to an impeller. The stator assembly is housed within the drive housing and is capable of generating a rotating magnetic field to drive the rotor to rotate. The bushing assembly includes a first bushing and a second bushing mounted on the drive housing. The first and second bushings are arranged along the rotation axis of the rotor. One of the first and second bushings abuts against the limiting portion. The second bushing includes a ring body and an extension extending from the ring body. The extension abuts against the first bushing to space the ring body from the first bushing. The rotor rotatably passes through the first bushing and the ring body, and the communication port allows the first and second bushings to pass through. The above-mentioned driving device is easy to install and has high assembly precision.

Description

TECHNICAL FIELD

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

[0002] An intravascular blood pump is a device designed to be inserted percutaneously into a blood vessel of a patient, to be advanced into the heart of the patient as a left ventricular assist device or a right ventricular assist device. The intravascular blood pump can also be referred to as an intracardiac blood pump.

[0003] The current intravascular blood pump mainly comprises an impeller and a motor for driving the impeller to rotate. The motor generates a rotating magnetic field when working. The impeller is provided with a magnet that interacts with the rotating magnetic field, so as to rotate the impeller around its axis, and to transport blood from a blood inlet of the blood pump to a blood outlet. However, since the intravascular blood pump has a small size, it is difficult to assemble. SUMMARY

[0004] The present application provides a blood pump and a driving device thereof, which can make the assembly process of the blood pump simpler and more convenient.

[0005] A driving device capable of driving an impeller of a blood pump to rotate, comprising:

[0006] A driving shell provided with a communication port and a limiting portion;

[0007] A rotor rotatably installed in the driving shell, part of the rotor being accommodated in the driving shell and part of the rotor extending out of the driving shell and being fixedly connected with the impeller;

[0008] A stator mechanism accommodated in the driving shell, the stator mechanism being capable of generating a rotating magnetic field for driving the rotor to rotate; and

[0009] A shaft sleeve assembly comprising a first shaft sleeve and a second shaft sleeve installed in the driving shell, the first shaft sleeve and the second shaft sleeve being arranged along a rotation axis of the rotor, one of the first shaft sleeve and the second shaft sleeve abutting against the limiting portion, the second shaft sleeve comprising a ring body and an extension portion extending from the ring body, the extension portion abutting against the first shaft sleeve so as to space the ring body and the first shaft sleeve apart, wherein the rotor is rotatably arranged through the first shaft sleeve and the ring body, and the communication port is capable of allowing the first shaft sleeve and the second shaft sleeve to pass through.

[0010] In one embodiment, the rotor comprises:

[0011] A rotating shaft, comprising a shaft body and a limiting ring arranged around the shaft body, the shaft body being rotatably arranged in the first shaft sleeve and the ring body, one end of the shaft body being accommodated in the driving shell, the other end extending out of the driving shell from the communication opening and being fixedly connected with the impeller, the limiting ring being arranged between the ring body and the first shaft sleeve, and the limiting ring being arranged between the shaft body and the extension, the outer diameter of the limiting ring being greater than the inner diameter of the ring body and the inner diameter of the first shaft sleeve, so as to limit the rotating shaft in the extension direction of the shaft body;

[0012] A magnetic assembly fixedly connected with the shaft body, wherein the stator mechanism can generate a rotating magnetic field to drive the magnetic assembly to rotate, and the magnetic assembly can drive the rotating shaft to rotate.

[0013] In one embodiment, the extension is annular, the extension is coaxial with the ring body, the inner diameter of the extension is greater than the outer diameter of the limiting ring, and a gap for fluid communication is formed between the extension and the limiting ring.

[0014] In one embodiment, the first shaft sleeve has a first shaft hole, and a first flow guide groove is further arranged on the side of the first shaft sleeve facing the limiting ring, the first flow guide groove being in communication with the first shaft hole, the shaft body being rotatably arranged in the first shaft hole, and a gap for fluid communication being formed between the shaft body and the first shaft hole.

[0015] In one embodiment, the ring body has a second shaft hole, and a second flow guide groove is further arranged on the side of the ring body facing the limiting ring, the second flow guide groove being in communication with the second shaft hole, the shaft body being rotatably arranged in the second shaft hole, and a gap for fluid communication being formed between the shaft body and the second shaft hole.

[0016] In one embodiment, the limiting ring has an outer ring surface and two end surfaces connected with the outer ring surface, and chamfers are arranged at the connection between the outer ring surface and the two end surfaces.

[0017] In one embodiment, a positioning groove is arranged on the first shaft sleeve, and one end of the extension away from the ring body is accommodated in the positioning groove, so as to position the second shaft sleeve.

[0018] In one of the embodiments, the first shaft sleeve comprises a disc portion and a frustum portion formed on a surface of the disc portion, the first shaft sleeve has a first shaft hole extending from a surface of the disc portion away from the frustum portion to an end surface of the frustum portion away from an end of the disc portion; the extension portion is annular, coaxial with the ring body, sleeved on the frustum portion, and abuts against the disc portion at an end thereof away from the ring body, wherein the rotor is rotatably arranged in the first shaft hole.

[0019] In one of the embodiments, the first shaft sleeve has a hole diameter on a side thereof closer to the ring body larger than a hole diameter on a side thereof away from the ring body; and / or, the ring body has a hole diameter on a side thereof closer to the second shaft sleeve larger than a hole diameter on a side thereof away from the ring body.

[0020] In one of the embodiments, the second shaft sleeve has a second shaft hole having a straight hole portion and a tapered hole portion in communication with the straight hole portion, the tapered hole portion has an end in communication with the straight hole portion and an end away from the first shaft sleeve, the rotor is rotatably arranged in the straight hole portion and the tapered hole portion.

[0021] In one of the embodiments, the straight hole portion has a length in the direction of the rotation axis of the rotor greater than or equal to 0.5 mm.

[0022] In one of the embodiments, the drive shell comprises a shell body and a mounting shell in abutment with the shell body, the first shaft sleeve and the second shaft sleeve are both mounted on the mounting shell, the stator mechanism is accommodated in the shell body, and the communication port and the limiting portion are both arranged on the mounting shell.

[0023] In one of the embodiments, the rotor comprises a rotor shaft and a magnetic assembly, one end of the rotor shaft is accommodated in the drive shell, the other end of the rotor shaft extends out of the drive shell and is fixedly connected with the impeller, the rotor shaft is rotatable relative to the drive shell, the magnetic assembly comprises a first magnet and a second magnet, and the first magnet and the second magnet are both fixedly connected with the rotor shaft.

[0024] The stator mechanism comprises a drive stator and a power stator, the drive stator and the power stator are arranged along the rotation axis of the rotor shaft, the drive stator is capable of generating a rotating magnetic field to drive the first magnet to rotate, and the power stator is capable of generating a rotating magnetic field to drive the second magnet to rotate; wherein the first magnet is located between the drive stator and the power stator, the rotor shaft is arranged in the power stator, and the drive stator is spaced apart from the rotor shaft in the extension direction of the rotor shaft.

[0025] In one embodiment, the drive stator includes a plurality of first magnetic cores and a plurality of first coils wound around the plurality of first magnetic cores, the plurality of first magnetic cores being arranged around the axis of rotation of the rotating shaft in one revolution; the power stator includes a plurality of second magnetic cores and a plurality of second coils wound around the plurality of second magnetic cores in one revolution, wherein both the first magnetic cores and the second magnetic cores include magnetic pillars, and the cross-sectional area of ​​the magnetic pillars of the first magnetic cores is larger than the cross-sectional area of ​​the magnetic pillars of the second magnetic cores.

[0026] In one embodiment, the rotating shaft has a first mating section and a second mating section, the cross-sectional area of ​​the first mating section being larger than that of the second mating section, the first mating section being rotatably inserted into the bushing assembly, and the second mating section being rotatably inserted into the power stator.

[0027] A blood pump, comprising:

[0028] The aforementioned drive device;

[0029] An impeller is disposed outside the drive housing, the impeller is fixedly connected to the rotor, and can rotate with the rotor.

[0030] The aforementioned blood pump drive device features a first and second bushing that support the rotor, arranged along the rotor's rotation axis. One of the first and second bushings abuts against a limiting member of the drive housing to support it. The ring body of the second bushing, supporting the rotor, abuts against the first bushing via an extension of the second bearing to support and separate the ring body and the first bushing, thus better supporting the rotor. The extension and the ring body are integral, reducing the number of parts and simplifying the assembly of the drive device. Furthermore, the connecting port is designed to allow the first and second bushings to pass through, enabling them to be inserted into the mounting housing of the drive housing, further facilitating the assembly of the drive device. This structural design not only simplifies the assembly of the drive device but also improves its assembly accuracy and production efficiency. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the structure of a blood pump according to one embodiment;

[0033] Figure 2 yes Figure 1 The diagram shown is a structural schematic of the blood pump with some parts of the cannula assembly and pigtail tube omitted.

[0034] Figure 3 yes Figure 2 The blood pump shown is a cross-sectional view along AA;

[0035] Figure 4 yes Figure 1 A schematic diagram of the drive mechanism for the blood pump shown.

[0036] Figure 5 yes Figure 4 A schematic diagram of the drive device from another angle;

[0037] Figure 6 yes Figure 5 A cross-sectional view of the drive unit shown along line BB;

[0038] Figure 7 yes Figure 4 A schematic diagram of the drive device from another angle;

[0039] Figure 8 yes Figure 7 A cross-sectional view of the drive unit shown along line CC;

[0040] Figure 9 yes Figure 4 An exploded view of the drive unit shown;

[0041] Figure 10 yes Figure 6 A sectional view of the drive unit's shaft, bushing assembly, and drive housing mounting housing.

[0042] Figure 11 yes Figure 9 A schematic diagram of the first bushing of the bushing assembly of the drive device shown from another angle;

[0043] Figure 12 yes Figure 9 A schematic diagram of the second bushing of the drive unit bushing assembly from another angle;

[0044] Figure 13 yes Figure 10 A cross-sectional view of the bushing assembly of the drive unit shown;

[0045] Figure 14 yes Figure 9 A cross-sectional view of the shaft of the drive unit shown;

[0046] Figure 15 yes Figure 8A sectional view of a rotor, a shaft sleeve assembly and a mounting shell of a drive shell of the drive device shown;

[0047] Figure 16 is Figure 9 A structural schematic view of a magnetic assembly of a rotor of the drive device shown from another angle;

[0048] Figure 17 is Figure 16 A sectional view of the magnetic assembly shown along line D-D;

[0049] Figure 18 is Figure 16 An exploded view of the magnetic assembly shown;

[0050] Figure 19 is Figure 9 A structural schematic view of a drive stator of the drive device shown from another angle. DETAILED DESCRIPTION

[0051] In order to make the purposes, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application.

[0052] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0053] In addition, the terms "first", "second" are only used for descriptive purposes and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0054] In order to illustrate the technical solutions of the present application, the following will be described with reference to specific drawings and embodiments.

[0055] Please refer to Figures 1-3 The first embodiment of the present application provides a blood pump 100, which comprises a drive device 10, a sleeve assembly 20 and an impeller 30. The sleeve assembly 20 is connected with the drive device 10; the impeller 30 is rotatably accommodated in the sleeve assembly 20; the impeller 30 is connected with the drive device 10, and the drive device 10 can drive the impeller 30 to rotate to realize the blood pumping function of the blood pump 100.

[0056] Specifically, the cannula assembly 20 has an inflow port 21 and an outflow port 22. In one embodiment, the cannula assembly 20 extends through a heart valve, such as an aortic valve, with the inflow port 21 located in the heart and the outflow port 22 and the drive device 10 located in a blood vessel outside the heart, such as the aorta. When the impeller 30 rotates, blood flows from the inflow port 21 into the cannula assembly 20 and out of the cannula assembly 20 from the outflow port 22.

[0057] More specifically, one end of the cannula assembly 20 is connected to the drive device 10, and the other end can be provided with a pigtail 23 for stabilizing the position of the blood pump 100 in the heart and providing non-invasive support for the heart tissue.

[0058] Specifically, the pigtail 23 is a hollow structure. The material of the pigtail 23 is selected from at least one of polyurethane, nylon, polyethylene, polyether block polyamide PEBAX, and latex material.

[0059] Further, the blood pump 100 further comprises a catheter assembly 40 connected to the drive device 10, and a supply line is arranged in the catheter assembly 40, the supply line comprising a cleaning line 411 for introducing a cleaning fluid into the drive device 10. Specifically, in the illustrated embodiment, the drive device 10 is located between the cannula assembly 20 and the catheter assembly 40.

[0060] Specifically, the cleaning fluid can be normal saline, normal saline containing heparin, or glucose, etc.

[0061] Please refer to Figures 3-9 The drive device 10 is in driving connection with the impeller 30, and the drive device 10 can drive the impeller 30 of the blood pump 100 to rotate. In the illustrated embodiment, the drive device 10 comprises a drive shell 11, a rotor 12, a stator mechanism 13, a fixing member 14, and a shaft sleeve assembly 15.

[0062] The drive shell 11 has a communication port 11a. The communication port 11a is located on the side of the drive shell 11 close to the cannula assembly 20. Specifically, the communication port 11a communicates the drive shell 11 and the cannula assembly 20. The impeller 30 is arranged outside the drive shell 11. Among them, the cleaning fluid introduced in the cleaning line 411 can flow through the inside of the drive shell 11, flow into the cannula assembly 20 from the communication port 11a, so as to prevent blood from penetrating into the drive shell 11 from the communication port 11a of the drive shell 11.

[0063] Please refer to Figure 10The drive shell 11 further comprises a limiting portion 11b. In the embodiment, the drive shell 11 comprises a shell body 111 and a mounting shell 112 which is connected to the shell body 111, and the communication port 11a and the limiting portion 11b are arranged on the mounting shell 112. Specifically, the shell body 111 and the mounting shell 112 are both substantially cylindrical. The limiting portion 11b is an annular protrusion arranged on the inner wall of the mounting shell 112. One open end of the mounting shell 112 is connected to one open end of the shell body 111, and the communication port 11a is an opening at one end of the mounting shell 112 which is away from the shell body 111. The limiting portion 11b is arranged at one end of the mounting shell 112 which is away from the communication port 11a, i.e. at one end of the mounting shell 112 which is close to the shell body 111.

[0064] The rotor 12 is rotatably arranged in the drive shell 11, and the rotor 12 is partially arranged in the drive shell 11 and partially extends out of the drive shell 11 and is fixedly connected to the impeller 30, so that the rotor 12 can drive the impeller 30 to rotate.

[0065] Please refer to Figure 3 , Figure 6 , Figure 8 and Figure 9 , specifically, the rotor 12 comprises a rotating shaft 121 and a magnetic assembly 122, one end of the rotating shaft 121 is arranged in the drive shell 11, the other end of the rotating shaft 121 extends out of the drive shell 11 from the communication port 11a and is fixedly connected to the impeller 30, and the rotating shaft 121 can rotate relative to the drive shell 11, and the magnetic assembly 122 is fixedly connected to the rotating shaft 121. Specifically, the rotating shaft 121 is arranged in the mounting shell 112, one end of the rotating shaft 121 is arranged in the shell body 111, and the other end of the rotating shaft 121 extends out of the drive shell 11 from the communication port 11a and is fixedly connected to the impeller 30. The magnetic assembly 122 is arranged in the shell body 111 of the drive shell 11.

[0066] Specifically, the rotating shaft 121 is made of ceramic or stainless steel, such as alumina toughened zirconia (ATZ) or SUS316L, to avoid breakage of the rotating shaft 121.

[0067] The stator mechanism 13 is arranged in the drive shell 11, and the stator mechanism 13 can generate a rotating magnetic field to drive the rotor 12 to rotate. Specifically, the stator mechanism 13 can generate a rotating magnetic field to drive the magnetic assembly 122 to rotate, so that the magnetic assembly 122 can drive the rotating shaft 121 to rotate around the axis of the rotating shaft 121. Specifically, the stator mechanism 13 is arranged in the shell body 111 of the drive shell 11.

[0068] In one of the embodiments, the magnetic assembly 122 comprises a first magnet 1222 fixedly connected with the rotating shaft 121. The stator mechanism 13 comprises a driving stator 131 which is spaced apart from the rotating shaft 121 along the axis of the rotating shaft 121, i.e. the rotating shaft 121 does not penetrate into the driving stator 131. The driving stator 131 is capable of generating a rotating magnetic field which interacts with the first magnet 1222, so as to drive the rotating shaft 121 to rotate around the axis of the rotating shaft 121, thereby driving the impeller 30 to rotate. In this way, the driving stator 131 is spaced apart from the rotating shaft 121 along the axis of the rotating shaft 121, i.e. the rotating shaft 121 does not penetrate into the driving stator 131, so that the driving stator 131 has a larger cross section perpendicular to the axial direction of the rotating shaft 121, the magnetic flux of the rotating magnetic field generated by the driving stator 131 is larger, and the torque on the first magnet 1222 is also larger, thereby reducing the current required by the driving stator 131 to drive the rotating shaft 121 to rotate, and ensuring that the blood pump 100 has lower power consumption and generates less heat.

[0069] Specifically, the driving stator 131 comprises a first back plate 1311, a plurality of first magnetic cores 1312, and a plurality of first coils 1313 which are arranged around the first magnetic cores 1312. The first back plate 1311 is fixedly connected in the driving shell 11. The plurality of first magnetic cores 1312 are arranged around the axis of the rotating shaft 121. Specifically, the extension direction of each first magnetic core 1312 is parallel to the extension direction of the rotating shaft 121. One end of each first magnetic core 1312 is fixedly connected with the first back plate 1311, and the other end extends to be close to the first magnet 1222. The first coils 1313 are capable of generating a rotating magnetic field which interacts with the first magnet 1222, thereby causing the first magnet 1222 to rotate, so as to drive the rotating shaft 121 to rotate, and the impeller 30 rotates with the rotating shaft 121.

[0070] It should be noted that, in some embodiments, the driving stator 131 can also not have the first back plate 1311. The first back plate 1311 functions to close the magnetic circuit, so as to facilitate and increase the generation of the magnetic flux of the driving stator 131, and improve the coupling capability. Since the first back plate 1311 can increase the magnetic flux, the first back plate 1311 is beneficial to reducing the overall diameter of the blood pump 100. The first back plate 1311 is made of the same material as the first magnetic cores 1312, and in some embodiments, the first back plate 1311 and the first magnetic cores 1312 are both made of soft magnetic material, such as cobalt steel.

[0071] The fixing member 14 is fixedly connected in the driving shell 11, and the fixing member 14 is provided with a positioning column 141. The first back plate 1311 is provided with a positioning hole 1311a, and the positioning column 141 penetrates through the positioning hole 1311a, so as to facilitate the positioning and installation of the driving stator 131. In this way, the axis of the positioning column 141 coincides with the axis of the rotating shaft 121.

[0072] Specifically, the fixing member 14 is provided with a through hole 142, which is in communication with the inner cavity of the driving shell 11 and used for accommodating one end of the cleaning pipeline 411.

[0073] Further, the fixing member 14 is also provided with a support hole 143, and the catheter assembly 40 is also provided with a support member (not shown in the figure), which is used for supporting the catheter assembly 40 and / or the blood pump 100 when the blood pump 100 is conveyed, and one end of the support member can be accommodated in the support hole 143. Specifically, the support member is, for example, a nickel-titanium wire.

[0074] Please refer to Figure 10 , the shaft sleeve assembly 15 includes a first shaft sleeve 152 and a second shaft sleeve 154 installed on the driving shell 11, the first shaft sleeve 152 and the second shaft sleeve 154 are arranged along the rotation axis of the rotor 12, one of the first shaft sleeve 152 and the second shaft sleeve 154 abuts against the limiting portion 11b, and the rotor 12 is rotatably arranged in the first shaft sleeve 152 and the second shaft sleeve 154. The communication port 11a can be passed through by the first shaft sleeve 152 and the second shaft sleeve 154. The communication port 11a is arranged to be passed through by the first shaft sleeve 152 and the second shaft sleeve 154, so that the first shaft sleeve 152 and the second shaft sleeve 154 can be installed in the mounting shell 112 of the driving shell 11 from the communication port 11a, which can facilitate the assembly of the driving device 10, improve the assembly accuracy, and improve the production efficiency. Specifically, in the illustrated embodiment, the first shaft sleeve 152 and the second shaft sleeve 154 are both installed in the mounting shell 112; the second shaft sleeve 154 is closer to the communication port 11a than the first shaft sleeve 152; the first shaft sleeve 152 abuts against the limiting portion 11b; and the rotating shaft 121 is rotatably arranged in the first shaft sleeve 152 and the second shaft sleeve 154.

[0075] The first shaft sleeve 152 and the rotating shaft 121 jointly constitute a bearing structure. The first shaft sleeve 152 has a first shaft hole 152a, and the rotor 12 (specifically, the rotating shaft 121) is rotatably arranged in the first shaft hole 152a, and there is a gap between the hole wall of the first shaft hole 152a and the rotating shaft 121 for the flow of fluid (such as cleaning fluid).

[0076] Please refer to Figure 11 , specifically, the first shaft sleeve 152 includes a disc portion 1522 and a circular truncated cone portion 1524 formed on one surface of the disc portion 1522, and the first shaft hole 152a extends from the surface of the disc portion 1522 away from the circular truncated cone portion 1524 to the end face of the end of the circular truncated cone portion 1524 away from the disc portion 1522. Wherein, the side of the disc portion 1522 away from the circular truncated cone portion 1524 abuts against the limiting portion 11b.

[0077] Please refer to Figure 10 , Figure 12And Figure 13 The second shaft sleeve 154 and the rotating shaft 121 jointly form a bearing structure. The second shaft sleeve 154 comprises a ring body 1542 and an extension part 1544 extending from the ring body 1542, i.e. the ring body 1542 and the extension part 1544 form an integral piece. The integral piece of the ring body 1542 and the extension part 1544 can simplify the assembly of the driving device 10 and make the rotating shaft 121 more stable in rotation. The extension part 1544 abuts against the first shaft sleeve 152 to separate the ring body 1542 from the first shaft sleeve 152, thereby positioning the relative positions of the first shaft sleeve 152 and the ring body 1542. The rotor 12 is rotatably arranged in the ring body 1542. Specifically, the ring body 1542 has a second shaft hole 154a, and the rotating shaft 121 is rotatably arranged in the second shaft hole 154a. The hole wall of the second shaft hole 154a and the rotating shaft 121 have a gap for fluid (e.g. cleaning fluid) to flow through.

[0078] Specifically in the illustrated embodiment, the extension part 1544 is annular, coaxial with the ring body 1542, and sleeved on the circular truncated cone part 1524. The end face of the end of the extension part 1544 away from the ring body 1542 abuts against the disc part 1522. The outer diameter of the circular truncated cone part 1524 is matched with the inner diameter of the extension part 1544.

[0079] Please refer again to Figure 9 And Figure 10 Further, the rotating shaft 121 comprises a shaft body 1212 and a limiting ring 1214 arranged around the shaft body 1212. The shaft body 1212 is rotatably arranged in the first shaft sleeve 152 and the ring body 1542. One end of the shaft body 1212 is accommodated in the driving shell 11, and the other end extends out of the driving shell 11 from the communication opening 11a and is fixedly connected with the impeller 30. The limiting ring 1214 is located between the ring body 1542 and the first shaft sleeve 152, and is located between the shaft body 1212 and the extension part 1544. The outer diameter of the limiting ring 1214 is greater than the inner diameter of the ring body 1542 and the inner diameter of the first shaft sleeve 152, so as to limit the rotating shaft 121 in the extension direction of the shaft body 1212, thereby avoiding the rotating shaft 121 from moving relative to the driving shell 11 in the extension direction of the rotating shaft 121.

[0080] The inner diameter of the extension 1544 is greater than the outer diameter of the limiting ring 1214, and a gap for fluid flow is formed between the extension 1544 and the limiting ring 1214. The cleaning fluid introduced into the inside of the drive shell 11 from the cleaning pipeline 411 flows through the gap between the first shaft hole 152a and the rotating shaft 121, the gap between the limiting ring 121a and the extension 1544, the gap between the hole wall of the second shaft hole 154a and the rotating shaft 121, and enters the sleeve assembly 20 from the communication port 11a, which not only plays a backwashing role, but also plays a lubricating role between the rotating shaft 121 and the first shaft sleeve 152 and between the rotating shaft 121 and the second shaft sleeve 154.

[0081] Please refer again to Figures 11-13 Specifically, a first flow guide groove 152b is further formed on the side of the first shaft sleeve 152 facing the limiting ring 1214, and the first flow guide groove 152b is in communication with the first shaft hole 152a. Since the first flow guide groove 152b is arranged on the side of the first shaft sleeve 152 facing the limiting ring 1214, the first flow guide groove 152b is also in communication with the gap between the extension 1544 and the limiting ring 1214, and the first flow guide groove 152b can facilitate fluid flow and reduce the influence of the abutment between the limiting ring 1214 and the first shaft sleeve 152 on fluid flow. Specifically, the first flow guide groove 152b is formed on the side of the circular truncated cone portion 1524 away from the disc portion 1522.

[0082] Specifically, a second flow guide groove 154b is further formed on the side of the ring body 1542 of the second shaft sleeve 154 facing the limiting ring 1214, and the second flow guide groove 154b is in communication with the second shaft hole 154a. Since the second flow guide groove 154b is arranged on the side of the ring body 1542 facing the limiting ring 1214, the second flow guide groove 154b is also in communication with the gap between the extension 1544 and the limiting ring 1214, and the second flow guide groove 154b can facilitate fluid flow between the gap between the extension 1544 and the limiting ring 1214 and the second shaft hole 154a, and reduce the influence of the abutment between the limiting ring 1214 and the ring body 1542 on fluid flow.

[0083] It should be noted that in other embodiments, a flow guide groove can be arranged in one of the first shaft sleeve 152 and the ring body 1542, or no flow guide groove can be arranged.

[0084] It can be understood that the extension 1544 is not limited to a ring shape, and in an embodiment, the extension 1544 is a rod-shaped structure, and a plurality of extensions 1544 are arranged around the rotation axis of the rotor. A positioning groove is further formed on the first shaft sleeve 152, and the end of the extension 1544 away from the ring body 1542 is accommodated in the positioning groove to position the second shaft sleeve 154.

[0085] Specifically, the hole diameter of the side of the first shaft sleeve 152 close to the ring body 1542 is larger than the hole diameter of the side of the first shaft sleeve 152 away from the ring body 1542. With such an arrangement, not only can the contact area between the first shaft sleeve 152 and the rotating shaft 121 be reduced to decrease friction, but also the flow of fluid is facilitated, and the amplitude of the wobble of the rotating shaft 121 is reduced.

[0086] Specifically, the hole diameter of the side of the ring body 1542 close to the first shaft sleeve 152 is larger than the hole diameter of the side of the ring body 1542 away from the first shaft sleeve 152. With such an arrangement, not only can the contact area between the ring body 1542 and the rotating shaft 121 be reduced to decrease friction, but also the flow of fluid is facilitated, and the amplitude of the wobble of the rotating shaft 121 is reduced and blood in the sleeve assembly 20 is prevented from entering the driving housing 11 through the second shaft hole 154a.

[0087] In one embodiment, the gap between the end of the ring body 1542 away from the first shaft sleeve 152 and the rotating shaft 121 is less than or equal to 2 μm. Since the smallest red blood cell (about 8 μm in diameter and about 2 μm in thickness) cannot enter a gap with a width less than or equal to 2 μm, and the reverse flushing cleaning fluid passes through this gap, blood is prevented from entering the interior of the driving housing 11 through the second shaft hole 154a.

[0088] Specifically, the second shaft hole 154a has a straight hole portion 154c and a tapered hole portion 154d in communication with the straight hole portion 154c, the tapered hole portion 154d has a smaller end in communication with the straight hole portion 154c and a larger end facing the ring body 1542, and the rotating shaft 121 of the rotor 12 is rotatably arranged in the straight hole portion 154c and the tapered hole portion 154d.

[0089] Specifically, the length of the straight hole portion 154c in the direction of the rotational axis of the rotor 12 is greater than or equal to 0.5 mm. That is, in the illustrated embodiment, the length of the straight hole portion 154c in the direction of the extension of the rotating shaft 121 is greater than or equal to 0.5 mm, so as to better support the rotating shaft 121.

[0090] In the illustrated embodiment, the first shaft hole 152a is also similar to the second shaft hole 154a and has a straight hole portion and a tapered hole portion, and the tapered hole portion of the first shaft hole 152a is closer to the ring body 1542 than the straight hole portion.

[0091] It can be understood that the first shaft hole 152a and the second shaft hole 154a are not limited to the above structure, and in other embodiments, the second shaft hole 154a can gradually decrease from the side close to the first shaft sleeve 154 to the side away from the first shaft sleeve 154; in other embodiments, the second shaft hole 154a can gradually increase from the side close to the first shaft sleeve 154 to the side away from the first shaft sleeve 154. Figure 13The hole wall of the second shaft hole 154a can be an inclined straight surface relative to the extension direction of the rotating shaft 121, or an arc surface, at the same view angle as the view angle shown, or the hole diameter of the second shaft hole 154a is equal from the side close to the first shaft sleeve 154 to the side away from the first shaft sleeve 154. The first shaft hole 152a can also have a similar structure as the second shaft hole 154a. In the same embodiment, the structures of the first shaft hole 152a and the second shaft hole 154a can be substantially the same or different.

[0092] Please refer to Figure 14 Specifically, the limiting ring 1214 has an outer ring surface 1214a and two end surfaces 1214b connected with the outer ring surface 1214a, and a chamfer 1214c is arranged at the connection between the outer ring surface 1214a and the two end surfaces 1214b. The chamfer 1214c arranged at the connection between the outer ring surface 1214a and the two end surfaces 1214b not only reduces the friction between the limiting ring 1214 and the first shaft sleeve 152 and the second shaft sleeve 154, but also facilitates the circulation of fluid.

[0093] Please refer to Figure 15 Specifically, the first shaft sleeve 152 and the second shaft sleeve 154 are fixedly connected with the driving shell 11. In one embodiment, the first shaft sleeve 152 and the second shaft sleeve 154 are fixedly connected with the driving shell 11 by adhesive. Specifically, in the illustrated embodiment, the end of the mounting shell 112 close to the shell body 111 is provided with a first glue groove 112a communicating with the inner hole of the mounting shell 112, and the adhesive in the first glue groove 112a fixedly connects the mounting shell 112, the first shaft sleeve 152 and the end of the extension 1544 away from the ring body 1542. The outer wall of the second shaft sleeve 154 is also provided with a second glue groove 154e, and the adhesive in the second glue groove 154e fixedly connects the mounting shell 112 and the second shaft sleeve 154.

[0094] Please refer to Figure 8Further, the magnetic assembly 122 further comprises a second magnet 1223 fixedly connected with the rotating shaft 121; the stator mechanism 13 further comprises a power stator 132, the power stator 132 and the driving stator 131 are arranged along the axis of the rotating shaft 121, and the power stator 132 is closer to the impeller 30 than the driving stator 131, that is, in the extension direction of the rotating shaft 121, the power stator 132 is arranged between the impeller 30 and the driving stator 131. Wherein, the rotating shaft 121 is rotatably arranged in the power stator 132, and the power stator 132 can generate a rotating magnetic field interacting with the second magnet 1223. The driving stator 131 and the power stator 132 can drive the first magnet 1222 and the second magnet 1223 to rotate respectively, and the driving stator 131 and the power stator 132 can jointly drive the rotating shaft 121 to rotate around the axis of the rotating shaft 121, thereby driving the impeller 30 to rotate, so as to provide greater driving force for the rotation of the impeller 30.

[0095] In the illustrated embodiment, the first magnet 1222 and the second magnet 1223 are arranged between the driving stator 131 and the power stator 132. Specifically, the magnetic assembly 122 further comprises a flywheel 1224 fixedly connected with the rotating shaft 121, the flywheel 1224 is located between the power stator 132 and the driving stator 131, and the first magnet 1222 and the second magnet 1223 are both arranged on the flywheel 1224.

[0096] The flywheel 1224 is fixedly sleeved on the end of the rotating shaft 121 away from the impeller 30. Wherein, the flywheel 1224 and the rotating shaft 121 can be integrally formed, or fixedly connected with the rotating shaft 121 by bonding, welding or the like.

[0097] By arranging the flywheel 1224, the connection strength of the magnets and the rotating shaft 121 can be increased, and the stability of the rotation of the rotating shaft 121 can be improved. In addition, by arranging the first magnet 1222 and the second magnet 1223 on the same flywheel 1224, the shaking of the rotating shaft 121 during rotation can be reduced, and the rotating shaft 121 can be more stable during rotation.

[0098] Please refer to Figure 16 and Figure 17 The flywheel 1224 comprises a disc-shaped portion 1224a and a tubular portion 1224b, the tubular portion 1224b is fixedly arranged in the middle of the disc-shaped portion 1224a and coaxial with the disc-shaped portion 1224a, the end of the rotating shaft 121 away from the impeller 30 is fixedly received in the tubular portion 1224b, and the first magnet 1222 and the second magnet 1223 are arranged on the two opposite sides of the disc-shaped portion 1224a respectively, so as to facilitate the assembly of the first magnet 1222 and the second magnet 1223, and to better fix the first magnet 1222 and the second magnet 1223 with the rotating shaft 121.

[0099] Please refer to Figure 18 Specifically, the first magnet 1222 and the second magnet 1223 are both annular Halbach array magnets. The first magnet 1222 includes a plurality of first magnetic blocks 1222a magnetized in parallel to the axis of the first magnet 1222, and the second magnet 1223 includes a plurality of second magnetic blocks 1223a magnetized in parallel to the axis of the second magnet 1223. The plurality of second magnetic blocks 1223a and the plurality of first magnetic blocks 1222a are arranged on the two sides of the disc-shaped portion 1224a in a direction away from each other. In the extension direction of the rotating shaft 121, each second magnetic block 1223a is arranged opposite to a first magnetic block 1222a, and the polarity of the opposite second magnetic block 1223a and the first magnetic block 1222a on the side facing the disc-shaped portion 1224a is opposite. In this way, the installation of the first magnet 1222 and the second magnet 1223 is facilitated, and the problem of assembly difficulty caused by the repulsion between the magnetic blocks of the first magnet 1222 and the magnetic blocks of the second magnet 1223 is avoided.

[0100] In some embodiments, the first magnet 1222 further includes a plurality of third magnetic blocks 1222b magnetized in the circumferential direction of the first magnet 1222, and the circumferentially magnetized third magnetic blocks 1222b and the first magnetic blocks 1222a magnetized in parallel to the axis of the first magnet 1222 are alternately arranged along the circumference of the first magnet 1222. Among them, the magnetization directions of adjacent first magnetic blocks 1222a are opposite, for example, the magnetization direction of one of the adjacent first magnetic blocks 1222 is from the side of the first magnetic block 1222a facing away from the disc-shaped portion 1224a to the side facing the disc-shaped portion 1224a, and the magnetization direction of the other is from the side of the first magnetic block 1222a facing the disc-shaped portion 1224a to the side facing away from the disc-shaped portion 1224a. The magnetization directions of adjacent third magnetic blocks 1222b are opposite in the circumference of the first magnet 1222.

[0101] Correspondingly, the second magnet 1223 further includes a plurality of fourth magnetic blocks 1223b magnetized in the circumferential direction of the second magnet 1223, and the fourth magnetic blocks 1223b and the second magnetic blocks 1223a are alternately arranged along the circumference of the second magnet 1223. Among them, the magnetization directions of adjacent second magnetic blocks 1223a are opposite, and the magnetization directions of adjacent fourth magnetic blocks 1223b are opposite in the circumference of the second magnet 1223.

[0102] It should be noted that the magnetization directions of the third magnetic blocks 1222b and the fourth magnetic blocks 1223b are not limited to being circumferentially magnetized, and in some embodiments, the magnetization directions of the third magnetic blocks 1222b and the fourth magnetic blocks 1223b can also be inclined relative to the axis of the rotating shaft 121.

[0103] In this embodiment, both the first magnet 1222 and the second magnet 1223 are provided with eight magnetic blocks, that is, there are four first magnetic blocks 1222a, four second magnetic blocks 1223a, four third magnetic blocks 1222b, and four fourth magnetic blocks 1223b. The first magnetic blocks 1222a, two magnetic blocks 1223a, three magnetic blocks 1222b, and four magnetic blocks 1223b are all fan-shaped annular magnets, and the first magnet 1222 and the second magnet 1223 are approximately circular annular structures. It is understood that in other embodiments, the first magnet 1222 and the second magnet 1223 may also be composed of more or fewer magnetic blocks, such as two, four, six, or ten.

[0104] To facilitate the installation of the first magnet 1222 and the second magnet 1223, the flywheel 1224 is also provided with a marking portion 1224c for determining the installation positions of the first magnet 1222a and the second magnet 1223a. The marking portion 1224c can be a groove, a scale line, or a mark, etc. When installing the first magnet 1222a and the second magnet 1223a, by simply marking the position of one of the first magnet 1222a and one of the second magnet 1223a with the marking portion 1224c, the installation positions of the remaining magnets can be determined, thereby facilitating the installation of the first magnet 1222 and the second magnet 1223. Specifically, the marking portion 1224c can be on at least one of the tubular portion 1224b and the disc-shaped portion 1224a.

[0105] In one embodiment, the flywheel 1224 is fixed to the shaft 121 by adhesive bonding. Please refer to... Figure 15 and Figure 17 A glue groove 121a is provided at the end of the rotating shaft 121 away from the impeller 30, and a stop protrusion 1224d is provided on the inner wall of the tubular portion 1224b to abut against the glue groove 121a. In this way, glue can be arranged in the glue groove 121a to facilitate the fixing of the rotating shaft 121 and the stop protrusion 1224d.

[0106] Furthermore, the dispensing groove 121a extends along a direction perpendicular to the axis of the rotating shaft 121, and the end of the dispensing groove 121a extends to the outer circumferential surface of the rotating shaft 121. This arrangement allows adhesive to be applied to the dispensing groove 121a, and the adhesive overflows to the outer circumferential surface of the rotating shaft 121 to bond the inner circumferential wall of the tubular portion 1224b and the circumferential surface of the rotating shaft 121. This allows for better fixation between the rotating shaft 121 and the flywheel 1224, or it also facilitates the overflow of excess adhesive used to bond the rotating shaft 121 and the tubular portion 1224b into the dispensing groove 121a.

[0107] In the embodiment, the flywheel 1224 further comprises an outer ring wall 1224e surrounding the disc-shaped portion 1224a. The outer ring wall 1224e, the tubular portion 1224b and the disc-shaped portion 1224a jointly define a first accommodating portion and a second accommodating portion for accommodating the first magnet 1222 and the second magnet 1223 respectively, and the first accommodating portion and the second accommodating portion are separated by the disc-shaped portion 1224a. Such arrangement can limit the first magnet 1222 and the second magnet 1223, which not only facilitates the installation of the first magnet 1222 and the second magnet 1223, but also makes the first magnet 1222 and the second magnet 1223 more stable in combination with the flywheel 1224.

[0108] In the embodiment, in the axial direction of the tubular portion 1224b, the side of the first magnet 1222 away from the disc-shaped portion 1224a is higher than the outer ring wall 1224e by a distance, and the side of the second magnet 1223 away from the disc-shaped portion 1224a is higher than the outer ring wall 1224e by a distance, so as to facilitate the installation of the first magnet 1222 and the second magnet 1223 on the flywheel 1224.

[0109] It should be noted that the flywheel 1224 is not limited to the above structure. In some embodiments, the flywheel 1224 does not have the outer ring wall 1224e. In some embodiments, the flywheel 1224 does not have the outer ring wall 1224e and the tubular portion 1224b, and in this case, the rotating shaft 121 is fixedly arranged in the disc-shaped portion 1224a, for example, the center of the disc-shaped portion 1224a. Compared with the flywheel 1224 having only the disc-shaped portion 1224a, the arrangement of the tubular portion 1224b can make the flywheel 1224 more stably connected with the rotating shaft 121.

[0110] Please refer to Figure 8 The structure of the power stator 132 is similar to that of the drive stator 131. The power stator 132 comprises a second back plate 1321, a plurality of second magnetic cores 1322 and a plurality of second coils 1323. The plurality of second magnetic cores 1322 are arranged around the rotating shaft 121 at intervals. The extension direction of each second magnetic core 1322 is parallel to the axis of the rotating shaft 121. One end of each second magnetic core 1322 is fixedly connected to the second back plate 1321, and the other end extends to be close to the second magnet 1223. In other words, in the axial direction of the rotating shaft 121, the drive stator 131 and the power stator 132 are arranged reversely. Each second coil 1323 is wound on the corresponding second magnetic core 1322. The second coil 1323 can generate a rotating magnetic field that interacts with the second magnet 1223.

[0111] The first magnetic core 1312 and the second magnetic core 1322 each include a magnetic post. A first coil 1313 is wound around the magnetic post of the first magnetic core 1312, and a second coil 1323 is wound around the magnetic post of the second magnetic core 1322. The cross-sectional area of ​​the magnetic post of the first magnetic core 1312 is larger than that of the magnetic post of the second magnetic core 1322. That is, the magnetic post of the first magnetic core 1312 is thicker than that of the magnetic post of the second magnetic core 1322.

[0112] The larger the cross-sectional area of ​​the magnetic column, the greater the magnetic flux generated, the greater the torque of the stator on the magnet, and the smaller the required current, which helps to reduce power consumption and heat generation. Since the shaft 121 passes through the middle of the power stator 132, the cross-sectional area of ​​the second magnetic core 1322 is limited by the radial dimension of the blood pump 100. However, the shaft 121 does not pass through the middle of the drive stator 131, allowing the first magnetic core 1312 to have a larger cross-sectional area. In other words, this arrangement can reduce power consumption and reduce heat generation of the drive device 10.

[0113] In this embodiment, both the first magnetic core 1312 and the second magnetic core 1322 have only magnetic pillars, that is, neither the first magnetic core 1312 nor the second magnetic core 1322 has a wide head (i.e., pole shoe). The width of the first magnetic core 1312 and the second magnetic core 1322 is constant along their length. The entire first magnetic core 1312 can be magnetically coupled with the first magnet 1222, and the entire second magnetic core 1322 can be magnetically coupled with the second magnet 1223. Compared with magnetic cores with pole shoes, this application can reduce magnetic losses and increase the magnetic coupling density between the first magnetic core 1312 and the first magnet 1222, and between the second magnetic core 1322 and the second magnet 1223, so as to increase the torque of the driving stator 131 on the first magnet 1222 (under equal current conditions) and the torque of the power stator 132 on the second magnet 1223 (under equal current conditions). In addition, the absence of a head in the first magnetic core 1312 and the second magnetic core 1322 can greatly reduce the problem of reduced motor power caused by local magnetic short circuits due to contact between adjacent magnetic cores.

[0114] The cross-sectional shape of the first magnetic core 1312 and the second magnetic core 1322, which only have magnetic pillars, can be fan-shaped, circular, trapezoidal, fan-ring-shaped, etc. For example... Figure 19 As shown in the illustrated embodiment, the first magnetic core 1312 and the second magnetic core 1322, which only have magnetic pillars, are approximately triangular prisms, with one edge of each core facing the axis of the rotating shaft 121. In this embodiment, the edges of both the first magnetic core 1312 and the second magnetic core 1322 are rounded. Rounding the edges facilitates the subsequent winding of the coil and also helps protect the insulating material covering the coil.

[0115] It can be understood that in other embodiments, the first magnetic core 1312 and the second magnetic core 1322 can also include a head arranged at one end of the magnetic column, the first back plate 1311 is combined with the end of the magnetic column of the first magnetic core 1312 away from the head; the second back plate 1321 is combined with the end of the magnetic column of the second magnetic core 1322 away from the head. Alternatively, in some embodiments, one of the first magnetic core 1312 and the second magnetic core 1322 can have both a magnetic column and a head, and the other can have only a magnetic column.

[0116] Please refer again to Figure 14 In order to make the second magnetic core 1322 of the power stator 132 as thick as possible, the rotating shaft 121 arranged in the power stator 132 needs to be thin, but considering that the rotating shaft 121 needs to cooperate with the shaft sleeve assembly 15, the rotating shaft 121 also needs to have greater rigidity and greater wear resistance. Therefore, the shaft body 1212 of the rotating shaft 121 has a first cooperation section 1212a and a second cooperation section 1212b, and the cross-sectional area of the first cooperation section 1212a is greater than that of the second cooperation section 1212b in the direction perpendicular to the extension direction of the shaft body 1212, that is, the first cooperation section 1212a is thicker than the second cooperation section 1212b. The first cooperation section 1212a is arranged in the shaft sleeve assembly 15, and the second cooperation section 1212b is arranged in the power stator 132. The limiting ring 1214 is fixedly arranged on the first cooperation section 1212a.

[0117] In order to avoid the cleaning fluid being contaminated and / or the elements in the driving device 10 being corroded, the driving stator 131 and the power stator 132 of the driving device 10 are both wrapped with a waterproof sealing film. The material of the waterproof sealing film can be silicone, glue, etc.

[0118] The above driving device 10 has at least the following advantages:

[0119] (1) The first bushing 152 and the second bushing 154 of the drive device 10 for supporting the rotor 12 are arranged along the rotation axis of the rotor 12, and one of the first bushing 152 and the second bushing 154 abuts against the limiting member 11b of the drive housing 11 to support one of the first bushing 152 and the second bushing 154. The ring body 1542 of the second bushing 154 supporting the rotor 12 abuts against the first bushing 152 through the extension 1544 of the second bearing 154 to support and separate the ring body 1542 and the first bushing 152, so as to better support the rotor 12; and the extension 1544 and the ring body 1542 are integral parts, which can reduce the assembly of parts and simplify the assembly of the drive device 10; furthermore, the connecting port 11a is configured to allow the first bushing 152 and the second bushing 154 to pass through, so that the first bushing 152 and the second bushing 154 can be inserted into the drive housing 11 from the connecting port 11a. The mounting housing 112 is used to make the assembly of the drive device 10 more convenient; and the above structural design makes the drive device 10 not only simple and convenient to assemble, but also improves the assembly accuracy of the drive device 10 and improves production efficiency.

[0120] (2) By setting a limiting ring 1214 on the rotating shaft 121, the outer diameter of the limiting ring 1214 is larger than the inner diameter of the ring body 1542 and the inner diameter of the first bushing 152, respectively, so as to limit the rotating shaft 121 in the extension direction of the shaft body 1212 and avoid the rotating shaft 121 from moving significantly relative to the drive housing 11 in the extension direction of the rotating shaft 121; and by setting the first guide groove 152b and / or the second guide groove 154b, it is beneficial to the flow of fluid and reduces the impact of the limiting ring 1214 on the flow of fluid when it abuts against the first bushing 152 or the ring body 1542.

[0121] (3) Setting the aperture of the side of the first bushing 152 near the ring body 1542 to be larger than the aperture of the side of the first bushing 152 away from the ring body 1542, and setting the aperture of the side of the ring body 1542 near the first bushing 152 to be larger than the aperture of the side of the ring body 1542 away from the first bushing 152, can not only make the parts of the first bushing 152 and the ring body 1542 that support the rotating shaft 121 as far apart as possible to reduce the shaking amplitude of the rotating shaft 121 as much as possible, but also reduce the contact area between the bushing assembly 15 and the rotating shaft 121, reduce friction, and also facilitate the flow of fluid (e.g., cleaning fluid).

[0122] (4) The length of the straight hole portion 154c of the second shaft hole 154a in the extension direction of the rotating shaft 121 is greater than or equal to 0.5 mm, so as to better support the rotating shaft 121.

[0123] (5) The driving stator 131 is arranged along the axis of the rotating shaft 121, so that the driving stator 131 has a larger cross section perpendicular to the axis of the rotating shaft 121, and the rotating magnetic field generated by the driving stator 131 has a larger magnetic flux, and the torque on the first magnet 1222 is also larger, thereby reducing the current required by the driving stator 131 to drive the rotating shaft 121 to rotate, and ensuring that the blood pump 100 has lower power consumption and generates less heat. By further arranging the power stator 132, the driving stator 131 and the power stator 132 can jointly drive the rotating shaft 121 to rotate around the axis of the rotating shaft 121, thereby driving the impeller 30 to rotate, so as to provide greater driving force for the rotation of the impeller 30.

[0124] It should be noted that the driving device 10 is not limited to the above structure. In some embodiments, the driving device 10 has two flywheels, both of which are arranged between the power stator 132 and the driving stator 131, and are fixedly connected to the rotating shaft 121 and arranged along the rotation axis of the rotating shaft 121. The first magnet 1222 and the second magnet 1223 are respectively mounted on the two flywheels.

[0125] It can be understood that at this time, the rotor 12 can also not have a flywheel; or the flywheel is one, which is used to mount one of the first magnet 1222 and the second magnet 1223.

[0126] Alternatively, the power stator 132 is located between the two flywheels, i.e., one flywheel is located between the impeller 30 and the power stator 132, and the other flywheel is located between the power stator 132 and the driving stator 131. The first magnet 1222 is fixed on the flywheel between the power stator 132 and the driving stator 131, and the second magnet 1223 is fixed on the flywheel between the impeller 30 and the power stator 132, i.e., the first magnet 1222 is located between the power stator 132 and the driving stator 131, and the second magnet 1223 is located between the impeller 30 and the power stator 132. It can be understood that at this time, the rotor 12 can also not have a flywheel.

[0127] Alternatively, in some embodiments, the rotating shaft 121 can also be arranged to pass through the driving stator 131, and the rotating shaft 121 passes through the driving stator 131 and the power stator 132. At this time, the entire magnetic assembly 122 can be arranged between the driving stator 131 and the power stator 132; or the power stator 132 is located between the first magnet 1222 and the second magnet 1223, or the driving stator 131 and the power stator 132 are both located between the first magnet 1222 and the second magnet 1223. It can be understood that at this time, the rotor 12 can also not have a flywheel.

[0128] Alternatively, in some embodiments, the driving device 10 has only one of the power stator 132 and the driving stator 131.

[0129] The above examples are only used to illustrate the technical solutions of the present application, but not to limit the same; although the present application has been described in detail with reference to the foregoing examples, it should be understood by those of ordinary skill in the art that the technical solutions recorded in the foregoing examples can be modified, or some technical features therein can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the examples of the present application, and should be included in the protection scope of the present application.

Claims

1. A driving device capable of driving the impeller of a blood pump to rotate, characterized in that, The utility model relates to a kind of motor, comprising: Drive shell, with communication port and limiting part; Rotor, rotatably mounted in the drive shell, part of the rotor is housed in the drive shell, part extends to the drive shell outside, and is fixed with the impeller; Stator mechanism, housed in the drive shell, the stator mechanism can generate rotating magnetic field driving the rotation of the rotor; And Bushing assembly, including first bushing and second bushing mounted on the drive shell, the first bushing and the second bushing are arranged along the rotation axis of the rotor, the second bushing is closer to the communication port than the first bushing, the side of the first bushing away from the second bushing is in contact with the limiting part, the second bushing includes ring body and extension part extending from the ring body, the extension part is in contact with the first bushing, so that the ring body is spaced from the first bushing, wherein the rotor is rotatably provided in the first bushing and the ring body, the communication port can pass through the first bushing and the second bushing, so that the first bushing and the second bushing can be loaded into the drive shell from the communication port; The rotor includes a shaft and a magnetic assembly, one end of the shaft is housed in the drive shell, the other end extends to the drive shell outside, and is fixed with the impeller, the shaft is rotatable relative to the drive shell, the magnetic assembly includes a first magnet and a second magnet, the first magnet and the second magnet are fixed to the shaft; The stator mechanism includes a drive stator and a power stator, the drive stator and the power stator are arranged along the rotation axis of the shaft, the drive stator can generate rotating magnetic field driving the rotation of the first magnet, the power stator can generate rotating magnetic field driving the rotation of the second magnet;Wherein, the first magnet is located between the drive stator and the power stator, wherein the shaft passes through the power stator, the drive stator is spaced from the shaft in the extension direction of the shaft, so that the shaft does not pass through the drive stator; The drive stator includes a plurality of first magnetic cores and a plurality of first coils wound around the first magnetic cores, respectively, and a plurality of first magnetic cores are arranged around the straight line where the rotation axis of the shaft is located for one turn;The power stator includes a plurality of second magnetic cores and a plurality of second coils wound around the second magnetic cores, respectively, and a plurality of second magnetic cores are arranged around the shaft for one turn, wherein the first magnetic core and the second magnetic core both include a magnetic column, the cross-sectional area of the magnetic column of the first magnetic core is greater than the cross-sectional area of the magnetic column of the second magnetic core.

2. The drive apparatus according to claim 1, characterized by The rotating shaft comprises a shaft body and a limiting ring arranged around the shaft body, the shaft body is rotatably arranged in the first shaft sleeve and the ring body, one end of the shaft body is accommodated in the driving shell, the other end of the shaft body extends out of the driving shell from the communication port and is fixedly connected with the impeller, the limiting ring is located between the ring body and the first shaft sleeve, and the limiting ring is located between the shaft body and the extension part, the outer diameter of the limiting ring is greater than the inner diameter of the ring body and the inner diameter of the first shaft sleeve, so as to limit the rotating shaft in the extension direction of the shaft body; The magnetic assembly is fixedly connected with the shaft body, wherein the stator mechanism can generate a rotating magnetic field to drive the magnetic assembly to rotate, and the magnetic assembly can drive the rotating shaft to rotate.

3. The drive apparatus according to claim 2, characterized by The extension part is annular, the extension part is coaxial with the ring body, the inner diameter of the extension part is greater than the outer diameter of the limiting ring, and the gap for fluid communication is formed between the extension part and the limiting ring.

4. The drive apparatus according to claim 2, characterized by The first shaft sleeve has a first shaft hole, a first flow guide groove is further arranged on the side of the first shaft sleeve facing the limiting ring, the first flow guide groove is communicated with the first shaft hole, the shaft body is rotatably arranged in the first shaft hole, and the gap for fluid communication is formed between the shaft body and the first shaft hole. And / or, the ring body has a second shaft hole, a second flow guide groove is further arranged on the side of the ring body facing the limiting ring, the second flow guide groove is communicated with the second shaft hole, the shaft body is rotatably arranged in the second shaft hole, and the gap for fluid communication is formed between the shaft body and the second shaft hole.

5. The drive apparatus according to claim 2, characterized by The limiting ring has an outer ring surface and two end surfaces connected with the outer ring surface, and chamfers are arranged at the connection positions of the outer ring surface and the two end surfaces.

6. The drive apparatus according to claim 1, characterized by The first shaft sleeve is provided with a positioning groove, and one end of the extension part away from the ring body is accommodated in the positioning groove to position the second shaft sleeve.

7. The drive apparatus according to claim 1, characterized by The first shaft sleeve comprises a disc part and a circular truncated cone part formed on one surface of the disc part, the first shaft sleeve has a first shaft hole, the first shaft hole extends from the surface of the disc part away from the circular truncated cone part to the end surface of the circular truncated cone part away from one end of the disc part, the extension part is annular, the extension part is coaxial with the ring body, the extension part is sleeved on the circular truncated cone part, and the end surface of the extension part away from the ring body abuts against the disc part, wherein the rotor is rotatably arranged in the first shaft hole.

8. The drive apparatus according to claim 1, characterized by The hole diameter of the side of the first shaft sleeve close to the ring body is greater than the hole diameter of the side of the first shaft sleeve away from the ring body, and / or the hole diameter of the side of the ring body close to the second shaft sleeve is greater than the hole diameter of the side of the ring body away from the ring body.

9. The drive apparatus according to claim 1, characterized by The second shaft sleeve has a second shaft hole, the second shaft hole has a straight hole part and a tapered hole part communicated with the straight hole part, the tapered hole part is communicated with the straight hole part at the end with smaller hole diameter, and the end with larger hole diameter faces the first shaft sleeve, and the rotor is rotatably arranged in the straight hole part and the tapered hole part.

10. The drive apparatus according to claim 9, characterized by The length of the straight hole portion in the direction of the rotation axis of the rotor is greater than or equal to 0.5 mm.

11. The drive apparatus according to claim 1, characterized by The driving shell comprises a shell body and a mounting shell which is connected with the shell body, the first shaft sleeve and the second shaft sleeve are both mounted on the mounting shell, the stator mechanism is accommodated in the shell body, and the communication port and the limiting portion are both arranged on the mounting shell.

12. The drive apparatus according to claim 1, characterized by The first shaft sleeve and the rotating shaft jointly constitute a bearing structure; the second shaft sleeve and the rotating shaft jointly constitute a bearing structure; and the limiting portion is located between the power stator and the first shaft sleeve.

13. The drive apparatus according to claim 1, characterized by The magnetic assembly further comprises a flywheel which is fixedly connected with the rotating shaft; the first magnet and the second magnet are both arranged on the flywheel; the flywheel comprises a disc-shaped portion and a tubular portion, the tubular portion is fixedly arranged in the middle of the disc-shaped portion and coaxial with the disc-shaped portion; one end of the rotating shaft which is away from the impeller is fixedly accommodated in the tubular portion, and a dot-gluing groove is arranged on the end; a limiting protrusion which abuts against the dot-gluing groove is arranged on the inner wall of the tubular portion, and the rotating shaft is fixedly connected with the limiting protrusion.

14. The drive apparatus according to claim 1, characterized by The rotating shaft has a first fitting section and a second fitting section, the cross-sectional area of the first fitting section is greater than that of the second fitting section, the first fitting section is rotatably arranged in the shaft sleeve assembly, and the second fitting section is rotatably arranged in the power stator.

15. A blood pump, characterized in that, The driving device comprises: The driving device as claimed in any one of claims 1 to 14; The impeller is arranged outside the driving shell, the impeller is fixedly connected with the rotor and can rotate with the rotor.

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