Blood pump and driving device thereof

Abstract

The invention relates to a blood pump and a driving device thereof, the driving device comprises a driving shell, a rotor, a stator assembly and a shaft sleeve assembly, and the driving shell is provided with a communicating port and a limiting part; the rotor can be rotatably installed on the driving shell, part of the rotor is contained in the driving shell, and part of the rotor extends out of the driving shell and is fixedly connected with the impeller; the stator mechanism is accommodated in the driving shell and can generate a rotating magnetic field for driving the rotor to rotate; the shaft sleeve assembly comprises a first shaft sleeve and a second shaft sleeve which are installed on the driving shell, the first shaft sleeve and the second shaft sleeve are arranged along the rotating axis of the rotor, one of the first shaft sleeve and the second shaft sleeve abuts against the limiting part, the second shaft sleeve comprises a ring body and an extending part extending out of the ring body, and the extending part abuts against the first shaft sleeve. The rotor can be rotatably arranged on the first shaft sleeve and the ring body in a penetrating mode, and the first shaft sleeve and the second shaft sleeve can penetrate through the communication opening. The driving device is convenient to install and has high assembling precision.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to a blood pump and its driving device. Background Technology

[0002] An intravascular blood pump is a device designed to be inserted percutaneously into a patient's blood vessel and then into the patient's heart as a left ventricular assist device or a right ventricular assist device. Intravascular blood pumps can also be called intracardiac blood pumps.

[0003] Current intravascular blood pumps mainly consist of an impeller and a motor that drives the impeller to rotate. When the motor operates, it generates a rotating magnetic field. The impeller has magnets that interact with this rotating magnetic field, causing the impeller to rotate around its axis and transport blood from the pump's inlet to its outlet. However, due to the small size of intravascular blood pumps, assembly is quite difficult. Summary of the Invention

[0004] This application provides a blood pump and its driving device, which makes the assembly process of the blood pump simpler and more convenient.

[0005] A driving device capable of rotating the impeller of a blood pump, comprising: The drive housing is provided with a communication port and a limiting part; 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 the impeller; A stator mechanism, housed within the drive housing, is capable of generating a rotating magnetic field to drive the rotor to rotate; and The bushing assembly includes a first bushing and a second bushing mounted on the drive housing. The first bushing and the second bushing are disposed along the rotation axis of the rotor. One of the first bushing and the second bushing 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 is rotatably disposed through the first bushing and the ring body. The communication port allows the first bushing and the second bushing to pass through.

[0006] In one embodiment, the rotor includes: A rotating shaft includes a shaft body and a limiting ring disposed around the shaft body. The shaft body is rotatably disposed between a first bushing and the ring body. One end of the shaft body is received in the drive housing, and the other end extends from the communication port to the outside of the drive housing and is fixedly connected to the impeller. The limiting ring is located between the ring body and the first bushing, and between the shaft body and the extension. The outer diameter of the limiting ring is larger than the inner diameter of the ring body and the inner diameter of the first bushing, respectively, so as to limit the rotating shaft in the extension direction of the shaft body. A magnetic assembly is fixed to the shaft body, wherein the stator mechanism is capable of generating a rotating magnetic field that drives the magnetic assembly to rotate, and the magnetic assembly is capable of driving the shaft to rotate.

[0007] In one embodiment, the extension is annular, the extension is coaxial with the ring body, the inner diameter of the extension is larger than the outer diameter of the limiting ring, and a gap for fluid flow is formed between the extension and the limiting ring.

[0008] In one embodiment, the first bushing has a first shaft hole, and a first guide groove is also provided on the side of the first bushing facing the limiting ring. The first guide groove communicates with the first shaft hole, and the shaft body is rotatably inserted through the first shaft hole. There is a gap between the shaft body and the first shaft hole for fluid to flow through. And / or, the ring body has a second shaft hole, and a second flow guide groove is also provided on the side of the ring body facing the limiting ring. The second flow guide groove communicates with the second shaft hole, and the shaft body is rotatably inserted through the second shaft hole. There is a gap between the shaft body and the second shaft hole for fluid flow.

[0009] In one embodiment, the limiting ring has an outer ring surface and two end faces connected to the outer ring surface, and the connection between the outer ring surface and the two end faces is provided with a chamfer.

[0010] In one embodiment, the first bushing has a positioning groove, and the end of the extension away from the ring body is received in the positioning groove to position the second bushing.

[0011] In one embodiment, the first bushing includes a disc portion and a frustum portion formed on a surface of the disc portion. The first bushing has a first shaft hole extending from the surface of the disc portion away from the frustum portion to an end face of the frustum portion away from the disc portion. The extension portion is annular and coaxial with the annular body. The extension portion is sleeved on the frustum portion, and the end face of the extension portion away from the annular body abuts against the disc portion. The rotor is rotatably disposed through the first shaft hole.

[0012] In one embodiment, the aperture of the first bushing on the side closer to the ring body is larger than the aperture of the first bushing on the side away from the ring body; and / or, the aperture of the ring body on the side closer to the second bushing is larger than the aperture of the ring body on the side away from the ring body.

[0013] In one embodiment, the second bushing has a second shaft hole, the second shaft hole having a straight hole portion and a tapered hole portion communicating with the straight hole portion, the smaller end of the tapered hole portion communicating with the straight hole portion, and the larger end facing the first bushing, the rotor being rotatably disposed through the straight hole portion and the tapered hole portion.

[0014] In one embodiment, the length of the straight hole in the direction of the rotor's rotation axis is greater than or equal to 0.5 mm.

[0015] In one embodiment, the drive housing includes a housing body and a mounting housing that docks with the housing body, the first bushing and the second bushing are both mounted on the mounting housing, the stator mechanism is housed in the housing body, and the communication port and the limiting portion are both disposed on the mounting housing.

[0016] In one embodiment, the rotor includes a shaft and a magnetic assembly. One end of the shaft is housed in the drive housing, and the other end extends out of the drive housing and is fixedly connected to the impeller. The shaft is rotatable relative to the drive housing. The magnetic assembly includes a first magnet and a second magnet, both of which are fixedly connected to the shaft. The stator mechanism includes a drive stator and a power stator, which are arranged along the rotation axis of the rotating shaft. The drive stator is capable of generating a rotating magnetic field that drives the first magnet to rotate, and the power stator is capable of generating a rotating magnetic field that drives the second magnet to rotate. The first magnet is located between the drive stator and the power stator. The rotating shaft passes through the power stator, and the drive stator is spaced apart from the rotating shaft in the extension direction of the rotating shaft.

[0017] 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 posts, and the cross-sectional area of ​​the magnetic posts of the first magnetic cores is larger than the cross-sectional area of ​​the magnetic posts of the second magnetic cores.

[0018] 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.

[0019] A blood pump, comprising: The aforementioned drive device; An impeller is disposed outside the drive housing, the impeller is fixedly connected to the rotor, and can rotate with the rotor.

[0020] 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

[0021] 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.

[0022] Figure 1 This is a schematic diagram of the structure of a blood pump according to one embodiment; Figure 2 yes Figure 1The diagram shown is a structural schematic of the blood pump with some parts of the cannula assembly and pigtail tube omitted. Figure 3 yes Figure 2 The blood pump shown is a cross-sectional view along AA; Figure 4 yes Figure 1 A schematic diagram of the drive mechanism for the blood pump shown. Figure 5 yes Figure 4 A schematic diagram of the drive device from another angle; Figure 6 yes Figure 5 A cross-sectional view of the drive unit shown along line BB; Figure 7 yes Figure 4 A schematic diagram of the drive device from another angle; Figure 8 yes Figure 7 A cross-sectional view of the drive unit shown along line CC; Figure 9 yes Figure 4 An exploded view of the drive unit shown; Figure 10 yes Figure 6 A sectional view of the drive unit's shaft, bushing assembly, and drive housing mounting housing. Figure 11 yes Figure 9 A schematic diagram of the first bushing of the bushing assembly of the drive device shown from another angle; Figure 12 yes Figure 9 A schematic diagram of the second bushing of the drive unit bushing assembly from another angle; Figure 13 yes Figure 10 A cross-sectional view of the bushing assembly of the drive unit shown; Figure 14 yes Figure 9 A cross-sectional view of the shaft of the drive unit shown; Figure 15 yes Figure 8 A sectional view of the drive unit's shaft, bushing assembly, and drive housing mounting housing. Figure 16 yes Figure 9 A schematic diagram of the magnetic assembly of the rotor of the drive device from another angle; Figure 17 yes Figure 16 The magnetic assembly shown is a cross-sectional view along line DD. Figure 18 yes Figure 16 An exploded view of the magnetic assembly shown. Figure 19 for Figure 9 A schematic diagram of the drive stator of the drive device from another angle. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0024] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0026] To illustrate the technical solution of this application, the following description is provided in conjunction with specific accompanying drawings and embodiments.

[0027] Please refer to Figures 1-3 The first embodiment of this application provides a blood pump 100, including a drive device 10, a cannula assembly 20, and an impeller 30. The cannula assembly 20 is connected to the drive device 10; the impeller 30 is rotatably housed in the cannula assembly 20; the impeller 30 is connected to the drive device 10, and the drive device 10 can drive the impeller 30 to rotate, so as to realize the blood pumping function of the blood pump 100.

[0028] Specifically, the cannula assembly 20 has an inlet 21 and an outlet 22. In one embodiment, the cannula assembly 20 extends through a heart valve, such as an aortic valve, with the inlet 21 located inside the heart and the outlet 22 and drive device 10 located outside the heart in a blood vessel such as the aorta. When the impeller 30 rotates, blood flows into the cannula assembly 20 from the inlet 21 and out of the cannula assembly 20 from the outlet 22.

[0029] 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 tube 23, which is used to stabilize the position of the blood pump 100 in the heart and provide non-invasive support to the heart tissue.

[0030] Specifically, the pig tail tube 23 has a hollow structure. The material of the pig tail tube 23 is selected from at least one of polyurethane, nylon, polyethylene, polyether block polyamide PEBAX, and latex materials.

[0031] Furthermore, the blood pump 100 also includes a catheter assembly 40, which is connected to the drive device 10. The catheter assembly 40 has a supply line, including a cleaning line 411 for supplying cleaning fluid to 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.

[0032] Specifically, the cleaning fluid can be physiological saline, heparinized physiological saline, or glucose, etc.

[0033] Please refer to the following: Figures 3-9 The drive unit 10 is connected to the impeller 30 via a transmission, and the drive unit 10 can drive the impeller 30 of the blood pump 100 to rotate. In the illustrated embodiment, the drive unit 10 includes a drive housing 11, a rotor 12, a stator mechanism 13, a fixing member 14, and a bushing assembly 15.

[0034] The drive housing 11 has a communication port 11a. The communication port 11a is located on the side of the drive housing 11 near the sleeve assembly 20. Specifically, the communication port 11a connects the drive housing 11 and the sleeve assembly 20. The impeller 30 is disposed outside the drive housing 11. The cleaning fluid introduced into the cleaning line 411 can flow through the interior of the drive housing 11 and into the sleeve assembly 20 from the communication port 11a, thereby preventing blood from seeping into the drive housing 11 from the communication port 11a.

[0035] Please refer to the following: Figure 10 The drive housing 11 also includes a limiting part 11b. In this embodiment, the drive housing 11 includes a housing body 111 and a mounting housing 112 that abuts against the housing body 111. Both the communication port 11a and the limiting part 11b are located on the mounting housing 112. Specifically, both the housing body 111 and the mounting housing 112 are generally cylindrical. The limiting part 11b is an annular protrusion on the inner wall of the mounting housing 112. One open end of the mounting housing 112 abuts against one open end of the housing body 111, and the communication port 11a is the opening at the end of the mounting housing 112 away from the housing body 111. The limiting part 11b is located at the end of the mounting housing 112 away from the communication port 11a, that is, the end of the mounting housing 112 closer to the housing body 111.

[0036] The rotor 12 is rotatably mounted on the drive housing 11. The rotor 12 is partially housed in the drive housing 11 and partially extends out of the drive housing 11 and is fixedly connected to the impeller 30. The rotor 12 can drive the impeller 30 to rotate.

[0037] Please combine Figure 3 , Figure 6 , Figure 8 and Figure 9 Specifically, the rotor 12 includes a shaft 121 and a magnetic assembly 122. One end of the shaft 121 is housed in the drive housing 11, and the other end extends from the communication port 11a to the outside of the drive housing 11 and is fixedly connected to the impeller 30. The shaft 121 is rotatable relative to the drive housing 11. The magnetic assembly 122 is fixedly connected to the shaft 121. Specifically, the shaft 121 passes through the mounting housing 112, with one end housed in the housing body 111 and the other end extending from the communication port 11a to the outside of the drive housing 11 and fixedly connected to the impeller 30. The magnetic assembly 122 is located within the housing body 111 of the drive housing 11.

[0038] Specifically, the shaft 121 is made of materials such as ceramic or stainless steel, for example, alumina-toughened zirconia (ATZ) or SUS316L, to prevent the shaft 121 from breaking.

[0039] The stator mechanism 13 is housed in the drive housing 11, and the stator mechanism 13 is capable of generating a rotating magnetic field that drives the rotor 12 to rotate. Specifically, the stator mechanism 13 is capable of generating a rotating magnetic field that drives 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 housed in the housing body 111 of the drive housing 11. In one embodiment, the magnetic assembly 122 includes a first magnet 1222, which is fixedly connected to the rotating shaft 121. The stator mechanism 13 includes a drive 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 drive stator 131. The drive stator 131 can generate a rotating magnetic field that interacts with the first magnet 1222, so that the first magnet 1222 can drive the rotating shaft 121 to rotate around the axis of the rotating shaft 121, thereby driving the impeller 30 to rotate. The drive stator 131 and the rotating shaft 121 are spaced apart along the axis of the rotating shaft 121, meaning that the rotating shaft 121 does not pass through the drive stator 131. This allows the drive stator 131 to have a larger cross-section perpendicular to the axis of the rotating shaft 121, resulting in a larger magnetic flux of the rotating magnetic field generated by the drive stator 131 and a larger torque on the first magnet 1222. This reduces the current required by the drive stator 131 to drive the rotating shaft 121 to rotate, ensuring that the blood pump 100 consumes less power and generates less heat.

[0040] Specifically, the drive stator 131 includes a first back plate 1311, a plurality of first magnetic cores 1312, and a plurality of first coils 1313 respectively arranged around the first magnetic cores 1312. The first back plate 1311 is fixed inside the drive housing 11. The plurality of first magnetic cores 1312 are arranged at intervals 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 fixed to the first back plate 1311, and the other end extends close to the first magnet 1222. The first coils 1313 can generate a rotating magnetic field that interacts with the first magnet 1222, thereby causing the first magnet 1222 to rotate, thereby driving the rotating shaft 121 to rotate, and the impeller 30 rotates with the rotating shaft 121.

[0041] It should be noted that in some embodiments, the drive stator 131 may not have a first back plate 1311. The first back plate 1311 serves to close the magnetic circuit, thereby promoting and increasing the generation of magnetic flux in the drive stator 131 and improving coupling capability. Since the first back plate 1311 can increase magnetic flux, providing the first back plate 1311 is beneficial for reducing the overall diameter of the blood pump 100. The first back plate 1311 and the first magnetic core 1312 are made of the same material. In some embodiments, both the first back plate 1311 and the first magnetic core 1312 are made of soft magnetic materials, such as cobalt steel.

[0042] The fixing member 14 is fixed inside the drive housing 11, and a positioning post 141 is provided on the fixing member 14; a positioning hole 1311a is provided on the first back plate 1311, and the positioning post 141 passes through the positioning hole 1311a, so as to facilitate the positioning and installation of the drive stator 131. The axis of the positioning post 141 coincides with the axis of the rotating shaft 121.

[0043] Specifically, the fixing member 14 has a through hole 142, which is connected to the inner cavity of the drive housing 11. The through hole 142 is used to accommodate one end of the cleaning pipeline 411.

[0044] Furthermore, the fixing member 14 is also provided with a support hole 143, and a support member (not shown) is also provided inside the catheter assembly 40. The support member is used to support the catheter assembly 40 and / or the blood pump 100 when the blood pump 100 is being delivered. One end of the support member can be received in the support hole 143. Specifically, the support member is, for example, a nickel-titanium wire.

[0045] Please combine again Figure 10The bushing assembly 15 includes a first bushing 152 and a second bushing 154 mounted on the drive housing 11. The first bushing 152 and the second bushing 154 are arranged along the rotation axis of the rotor 12. One of the first bushing 152 and the second bushing 154 abuts against the limiting part 11b. The rotor 12 is rotatably inserted through the first bushing 152 and the second bushing 154. A connecting port 11a allows the first bushing 152 and the second bushing 154 to pass through. By configuring the connecting port 11a to allow the first bushing 152 and the second bushing 154 to pass through, the first bushing 152 and the second bushing 154 can be inserted into the mounting shell 112 of the drive housing 11 from the connecting port 11a. This facilitates the assembly of the drive device 10, improves assembly accuracy, and increases production efficiency. Specifically, in the illustrated embodiment, both the first bushing 152 and the second bushing 154 are installed in the mounting housing 112; the second bushing 154 is closer to the communication port 11a than the first bushing 152; the first bushing 152 abuts against the limiting part 11b; and the rotating shaft 121 is rotatably inserted through the first bushing 152 and the second bushing 154.

[0046] The first bushing 152 and the rotating shaft 121 together constitute a bearing structure. The first bushing 152 has a first shaft hole 152a, and the rotor 12 (specifically the rotating shaft 121) is rotatably inserted through the first shaft hole 152a. There is a gap between the hole wall of the first shaft hole 152a and the rotating shaft 121 for fluid (e.g., cleaning fluid) to flow through.

[0047] Please refer to the following: Figure 11 Specifically, the first bushing 152 includes a disc portion 1522 and a frustum portion 1524 formed on one surface of the disc portion 1522. The first shaft hole 152a extends from the surface of the disc portion 1522 away from the frustum portion 1524 to the end face of the frustum portion 1524 away from the disc portion 1522. The side of the disc portion 1522 away from the frustum portion 1524 abuts against the limiting portion 11b.

[0048] Please refer to the following: Figure 10 , Figure 12 and Figure 13The second bushing 154 and the rotating shaft 121 together constitute a bearing structure. The second bushing 154 includes a ring body 1542 and an extension 1544 extending from the ring body 1542; that is, the ring body 1542 and the extension 1544 form an integral piece. This integral design simplifies the assembly of the drive device 10 and makes the rotating shaft 121 more stable during rotation. The extension 1544 abuts against the first bushing 152, thus spacing the ring body 1542 from the first bushing 152 and positioning the relative positions of the first bushing 152 and the ring body 1542. The rotor 12 is rotatably inserted through the ring body 1542. Specifically, the ring body 1542 has a second shaft hole 154a, and the rotating shaft 121 is rotatably inserted through the second shaft hole 154a. There is a gap between the hole wall of the second shaft hole 154a and the rotating shaft 121 for fluid (e.g., cleaning fluid) to flow through.

[0049] In the specific embodiment shown in the figure, the extension 1544 is annular and coaxial with the ring body 1542. The extension 1544 is fitted onto the frustum portion 1524, and the end face of the extension 1544 away from the ring body 1542 abuts against the disk portion 1522. The outer diameter of the frustum portion 1524 is adapted to the inner diameter of the extension 1544.

[0050] Please combine again Figure 9 and Figure 10 Furthermore, the rotating shaft 121 includes a shaft body 1212 and a limiting ring 1214 encircling the shaft body 1212. The shaft body 1212 is rotatably disposed through the first bushing 152 and the ring body 1542. One end of the shaft body 1212 is housed in the drive housing 11, and the other end extends from the communication port 11a to the outside of the drive housing 11 and is fixedly connected to the impeller 30. The limiting ring 1214 is located between the ring body 1542 and the first bushing 152, and the limiting ring 1214 is located between the shaft body 1212 and the extension 1544. 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, so as to limit the rotating shaft 121 in the extension direction of the shaft body 1212 and prevent the rotating shaft 121 from moving significantly relative to the drive housing 11 in the extension direction of the rotating shaft 121.

[0051] The inner diameter of the extension 1544 is larger 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 drive housing 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 through the connecting port 11a. This not only serves as backflushing but also lubricates the area between the rotating shaft 121 and the first bushing 152, and between the rotating shaft 121 and the second bushing 154.

[0052] Please combine again Figures 11-13 Specifically, a first guide groove 152b is also provided on the side of the first bushing 152 facing the limiting ring 1214, and the first guide groove 152b communicates with the first shaft hole 152a. Since the first guide groove 152b is provided on the side of the first bushing 152 facing the limiting ring 1214, and the first guide groove 152b also communicates with the gap between the extension 1544 and the limiting ring 1214, the first guide groove 152b can facilitate fluid flow and reduce the impact on fluid flow when the limiting ring 1214 abuts against the first bushing 152. Specifically, the first guide groove 152b is provided on the side of the frustum portion 1524 away from the disk portion 1522.

[0053] Specifically, a second guide groove 154b is provided on the side of the ring body 1542 of the second bushing 154 facing the limiting ring 1214, and the second guide groove 154b communicates with the second shaft hole 154a. Since the second guide groove 154b is provided on the side of the ring body 1542 facing the limiting ring 1214, and the second guide groove 154b is also connected to the gap between the extension 1544 and the limiting ring 1214, the second guide groove 154b can facilitate the flow of fluid between the gap between the extension 1544 and the limiting ring 1214 and the second shaft hole 154a, reducing the impact on fluid flow when the limiting ring 1214 abuts against the ring body 1542.

[0054] It should be noted that in other embodiments, a guide groove may be provided in one of the first bushing 152 and the ring body 1542, or no guide groove may be provided.

[0055] It is understood that the extension 1544 is not limited to being annular. In one embodiment, the extension 1544 is a rod-shaped structure, and there are multiple extensions 1544. The multiple extensions 1544 are arranged around the rotation axis of the rotor. The first bushing 152 is also provided with a positioning groove. The end of the extension 1544 away from the ring body 1542 is received in the positioning groove to position the second bushing 154.

[0056] Specifically, the aperture of the first bushing 152 on the side closer to the ring body 1542 is larger than the aperture of the side of the first bushing 152 away from the ring body 1542. This arrangement not only reduces the contact area between the first bushing 152 and the rotating shaft 121, thus reducing friction, but also facilitates fluid flow and reduces the sway amplitude of the rotating shaft 121.

[0057] Specifically, the aperture of the side of the ring body 1542 closest to the first bushing 152 is larger than the aperture of the side of the ring body 1542 away from the first bushing 152. This arrangement not only reduces the contact area between the ring body 1542 and the rotating shaft 121, thus reducing friction, but also facilitates fluid flow, reduces the swaying amplitude of the rotating shaft 121, and prevents blood in the sleeve assembly 20 from entering the drive housing 11 through the second shaft hole 154a.

[0058] In one embodiment, the gap between the end of the ring body 1542 away from the first bushing 152 and the rotating shaft 121 is less than or equal to 2 μm. Since the smallest red blood cell (approximately 8 μm in diameter and approximately 2 μm in thickness) is difficult to enter a gap with a width less than or equal to 2 μm, and the backwashing fluid passes through this gap, blood is prevented from entering the interior of the drive housing 11 through the second shaft hole 154a.

[0059] Specifically, the second shaft hole 154a has a straight hole portion 154c and a tapered hole portion 154d communicating with the straight hole portion 154c. The smaller end of the tapered hole portion 154d is connected to the straight hole portion 154c, and the larger end faces the ring body 1542. The rotor 12 (specifically the rotating shaft 121) is rotatably inserted through the straight hole portion 154c and the tapered hole portion 154d.

[0060] Specifically, the length of the straight hole portion 154c in the direction of the rotation 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 extension direction of the shaft 121 is greater than or equal to 0.5 mm, so as to better support the shaft 121.

[0061] In the illustrated embodiment, the first shaft hole 152a is similar to the second shaft hole 154a, having a straight hole portion and a tapered hole portion, with the tapered hole portion of the first shaft hole 152a being closer to the ring body 1542 than its straight hole portion.

[0062] It is understood that the first shaft hole 152a and the second shaft hole 154a are not limited to the above-described structure. In other embodiments, the second shaft hole 154a may also gradually decrease in size from the side closer to the first bushing 154 to the side farther away from the first bushing 154; in relation to Figure 13From the same viewing angle, the wall of the second shaft hole 154a can be an inclined straight surface or an arc surface relative to the extending direction of the rotating shaft 121; or, the diameter of the second shaft hole 154 is equal from the side near the first bushing 154 to the side away from the first bushing 154. The first shaft hole 152a can also have a similar structure to 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.

[0063] Please see Figure 14 Specifically, the limiting ring 1214 has an outer ring surface 1214a and two end surfaces 1214b connected to the outer ring surface 1214a. A chamfer 1214c is provided at the connection points of the outer ring surface 1214a and the two end surfaces 1214b. Providing a chamfer 1214c at the connection points of the outer ring surface 1214a and the two end surfaces 1214b not only reduces friction between the limiting ring 1214 and the first bushing 152 and the second bushing 154, but also facilitates fluid flow.

[0064] Please combine Figure 15 Specifically, both the first bushing 152 and the second bushing 154 are fixedly connected to the drive housing 11. In one embodiment, both the first bushing 152 and the second bushing 154 are bonded to the drive housing 11 with adhesive. Specifically, in the illustrated embodiment, a first adhesive groove 112a communicating with the inner hole of the mounting housing 112 is provided at one end of the mounting housing 112 near the housing body 111. The adhesive in the first adhesive groove 112a bonds and fixes the mounting housing 112, the first bushing 152, and the end of the extension 1544 away from the ring body 1542. A second adhesive groove 154e is also provided on the outer wall of the second bushing 154. The adhesive in the second adhesive groove 154e fixes and bonds the mounting housing 112 and the second bushing 154.

[0065] Please combine again Figure 8Furthermore, the magnetic assembly 122 also includes a second magnet 1223, which is fixedly connected to the rotating shaft 121; the stator mechanism 13 also includes a power stator 132, which and the drive 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 drive 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 drive stator 131. The rotating shaft 121 is rotatably inserted through the power stator 132, and the power stator 132 is capable of generating a rotating magnetic field that interacts with the second magnet 1223. The drive stator 131 and the power stator 132 can drive the first magnet 1222 and the second magnet 1223 to rotate respectively, so that the drive 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 a greater driving force for the rotation of the impeller 30.

[0066] In the illustrated embodiment, the first magnet 1222 and the second magnet 1223 are arranged between the drive stator 131 and the power stator 132. Specifically, the magnetic assembly 122 also includes a flywheel 1224 fixedly connected to the rotating shaft 121. The flywheel 1224 is located between the power stator 132 and the drive stator 131, and both the first magnet 1222 and the second magnet 1223 are disposed on the flywheel 1224.

[0067] The flywheel 1224 is fixedly sleeved on the end of the rotating shaft 121 away from the impeller 30. The flywheel 1224 and the rotating shaft 121 can be integrally formed, or fixed to the rotating shaft 121 by means of bonding, welding or other methods.

[0068] By setting the flywheel 1224, the connection strength between the magnet and the rotating shaft 121 can be increased, thereby improving the rotational stability of the rotating shaft 121. In addition, by setting both 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, making the rotating shaft 121 more stable during rotation.

[0069] Please combine Figure 16 and Figure 17 The flywheel 1224 includes a disc-shaped portion 1224a and a tubular portion 1224b. The tubular portion 1224b is fixedly inserted through the middle of the disc-shaped portion 1224a and is coaxial with the disc-shaped portion 1224a. The end of the rotating shaft 121 away from the impeller 30 is fixedly housed in the tubular portion 1224b. The first magnet 1222 and the second magnet 1223 are respectively arranged on opposite sides of the disc-shaped portion 1224a, which facilitates the assembly of the first magnet 1222 and the second magnet 1223, so as to better fix the first magnet 1222 and the second magnet 1223 to the rotating shaft 121.

[0070] Please combine Figure 18Specifically, both the first magnet 1222 and the second magnet 1223 are annular Heilbeck array magnets. The first magnet 1222 includes a plurality of first magnetic blocks 1222a whose magnetization direction is parallel to the axis of the first magnet 1222. The second magnet 1223 includes a plurality of second magnetic blocks 1223a whose magnetization direction is 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 respectively arranged around the rotating shaft 121 on opposite sides of the disk-shaped portion 1224a. In the extending direction of the rotating shaft 121, each second magnetic block 1223a is arranged opposite to one first magnetic block 1222a, and the polarity of the oppositely arranged second magnetic block 1223a is opposite to that of the first magnetic block 1222a facing the disk-shaped portion 1224a. This arrangement facilitates the installation of the first magnet 1222 and the second magnet 1223, avoiding the problem of assembly difficulties caused by the mutual repulsion between the magnetic blocks of the first magnet 1222 and the magnetic blocks of the second magnet 1223.

[0071] In some embodiments, the first magnet 1222 further includes a plurality of third magnetic blocks 1222b magnetized circumferentially along the first magnet 1222. The circumferentially magnetized third magnetic blocks 1222b and the first magnetic blocks 1222a magnetized along an axis parallel to the first magnet 1222 are alternately arranged along the circumference of the first magnet 1222. Adjacent first magnetic blocks 1222a have opposite magnetization directions. For example, one adjacent first magnet 1222a may be magnetized from the side of the first magnetic block 1222a facing away from the disk-shaped portion 1224a towards the side facing the disk-shaped portion 1224a, while the other may be magnetized from the side of the first magnetic block 1222a facing the disk-shaped portion 1224a towards the side facing away from the disk-shaped portion 1224a. Adjacent third magnetic blocks 1222b have opposite magnetization directions along the circumference of the first magnet 1222.

[0072] Correspondingly, the second magnet 1223 also includes a plurality of fourth magnetic blocks 1223b magnetized along the circumference 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. Adjacent second magnetic blocks 1223a are magnetized in opposite directions, and adjacent fourth magnetic blocks 1223b are magnetized in opposite directions along the circumference of the second magnet 1223.

[0073] It should be noted that the magnetization direction of the third magnetic block 1222b and the fourth magnetic block 1223b is not limited to circumferential magnetization. In some embodiments, the magnetization direction of the third magnetic block 1222b and the fourth magnetic block 1223b can also be inclined relative to the axis of the rotating shaft 121.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] In this embodiment, the flywheel 1224 further includes 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 together enclose a first accommodating portion and a second accommodating portion, respectively accommodating the first magnet 1222 and the second magnet 1223, and the first accommodating portion and the second accommodating portion are separated by the disc-shaped portion 1224a. This arrangement can limit the positioning of 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 connection between the first magnet 1222 and the second magnet 1223 and the flywheel 1224 more stable.

[0079] In this embodiment, in the axial direction of the tubular portion 1224b, the side of the first magnet 1222 facing away from the disc-shaped portion 1224a is higher than the outer ring wall 1224e by a certain distance, and the side of the second magnet 1223 facing away from the disc-shaped portion 1224a is higher than the outer ring wall 1224e by a certain distance, so as to facilitate the first magnet 1222 and the second magnet 1223 to be assembled on the flywheel 1224.

[0080] It should be noted that the flywheel 1224 is not limited to the structure described above. In some embodiments, the flywheel 1224 does not have an outer ring wall 1224e; in some embodiments, the flywheel 1224 does not have an outer ring wall 1224e and a tubular portion 1224b. In this case, the shaft 121 is fixedly inserted through the disc-shaped portion 1224a, for example, at the center of the disc-shaped portion 1224a. Compared to a flywheel 1224 with only a disc-shaped portion 1224a, providing the tubular portion 1224b allows for a more stable connection between the flywheel 1224 and the shaft 121.

[0081] Please combine Figure 8 The structure of the power stator 132 is similar to that of the drive stator 131. The power stator 132 includes a second back plate 1321, multiple second magnetic cores 1322, and multiple second coils 1323. The multiple second magnetic cores 1322 are spaced around the rotating shaft 121 at intervals, with the extension direction of each second magnetic core 1322 parallel to the axis of the rotating shaft 121. One end of each second magnetic core 1322 is fixed to the second back plate 1321, and the other end extends close to the second magnet 1223. In other words, the drive stator 131 and the power stator 132 are arranged in opposite directions along the axial direction of the rotating shaft 121. Each second coil 1323 is wound around a corresponding second magnetic core 1322. The second coil 1323 can generate a rotating magnetic field that interacts with the second magnet 1223.

[0082] 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.

[0083] 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.

[0084] 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 in the length direction. 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 loss 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.

[0085] 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.

[0086] It is understood that, in other embodiments, the first magnetic core 1312 and the second magnetic core 1322 may further include a head disposed at one end of the magnetic post, the first back plate 1311 being engaged with the end of the magnetic post of the first magnetic core 1312 away from the head; and the second back plate 1321 being engaged with the end of the magnetic post 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 may have both a magnetic post and a head, while the other may only have a magnetic post.

[0087] Please refer to it again. Figure 14 To make the second magnetic core 1322 of the power stator 132 as thick as possible, the rotating shaft 121 passing through the power stator 132 needs to be relatively thin. However, considering that the rotating shaft 121 needs to fit with the bushing assembly 15, and that the rotating shaft 121 also needs to have greater rigidity and wear resistance, the shaft body 1212 of the rotating shaft 121 has a first mating section 1212a and a second mating section 1212b. In the extension direction perpendicular to the shaft body 1212, the cross-sectional area of ​​the first mating section 1212a is larger than the cross-sectional area of ​​the second mating section 1212b, that is, the first mating section 1212a is thicker than the second mating section 1212b. The first mating section 1212a passes through the bushing assembly 15, and the second mating section 1212b passes through the power stator 132. A limiting ring 1214 is fixedly disposed on the first mating section 1212a.

[0088] To prevent contamination of the cleaning fluid and / or corrosion of components within the drive unit 10, both the drive stator 131 and the power stator 132 of the drive unit 10 are covered with a waterproof sealing membrane. The waterproof sealing membrane can be made of materials such as silicone or adhesive.

[0089] The aforementioned drive device 10 has at least the following advantages: (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 the separating ring body 1542 and the first bushing 152, so as to better support the rotor 12. Furthermore, the extension 1544 and the ring body 1542 are integrated, which reduces the number of parts to be assembled and simplifies the assembly of the drive device 10. The connecting port 11a is further 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 mounting shell 112 of the drive housing 11 from the connecting port 11a, making the assembly of the drive device 10 more convenient. Moreover, 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 increases production efficiency.

[0090] (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 influence of the limiting ring 1214 on the flow of fluid when it abuts against the first bushing 152 or the ring body 1542.

[0091] (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).

[0092] (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.

[0093] (5) By setting the drive stator 131 and the rotating shaft 121 at intervals along the axis of the rotating shaft 121, the cross section of the drive stator 131 perpendicular to the axis of the rotating shaft 121 can be larger, the magnetic flux of the rotating magnetic field generated by the drive stator 131 can be larger, and the torque on the first magnet 1222 can be larger, thereby reducing the current required by the drive stator 131 when driving the rotating shaft 121 to rotate, which can ensure that the blood pump 100 has lower power consumption and less heat generation; by further setting the power stator 132, the drive 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 a greater driving force for the rotation of the impeller 30.

[0094] It should be noted that the drive device 10 is not limited to the structure described above. In some embodiments, the drive device 10 has two flywheels, both of which are disposed between the power stator 132 and the drive stator 131. Both flywheels are fixed 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.

[0095] It is understandable that, at this time, the rotor 12 may not have a flywheel; or, there may be one flywheel, which is used to mount one of the first magnet 1222 and the second magnet 1223.

[0096] Alternatively, the power stator 132 can be located between two flywheels, with one flywheel located between the impeller 30 and the power stator 132, and the other flywheel located between the power stator 132 and the drive stator 131. A first magnet 1222 is fixed to the flywheel between the power stator 132 and the drive stator 131, and a second magnet 1223 is fixed to the flywheel between the impeller 30 and the power stator 132. In other words, the first magnet 1222 is located between the power stator 132 and the drive stator 131, and the second magnet 1223 is located between the impeller 30 and the power stator 132. It is understood that in this case, the rotor 12 may also not have a flywheel.

[0097] Alternatively, in some embodiments, the rotating shaft 121 may be configured to pass through the drive stator 131, and the rotating shaft 121 may pass through both the drive stator 131 and the power stator 132. In this case, the entire magnetic assembly 122 may be disposed between the drive stator 131 and the power stator 132; or, the power stator 132 may be located between the first magnet 1222 and the second magnet 1223; or, both the drive stator 131 and the power stator 132 may be located between the first magnet 1222 and the second magnet 1223. It is understood that in this case, the rotor 12 may not have a flywheel.

[0098] Alternatively, in some embodiments, the drive unit 10 may have only one of the power stator 132 and the drive stator 131.

[0099] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A driving device capable of driving the impeller of a blood pump to rotate, characterized in that, include: The drive housing is provided with a communication port and a limiting part; 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 the impeller; A stator mechanism, housed within the drive housing, is capable of generating a rotating magnetic field that drives the rotor to rotate. and A bushing assembly includes a first bushing and a second bushing mounted on the drive housing. The first bushing and the second bushing are disposed along the rotation axis of the rotor. One of the first bushing and the second bushing 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 is rotatably disposed through the first bushing and the ring body. The communication port allows the first bushing and the second bushing to pass through so that the first bushing and the second bushing can be inserted into the drive housing from the communication port.

2. The driving device according to claim 1, characterized in that, The rotor includes: A rotating shaft includes a shaft body and a limiting ring disposed around the shaft body. The shaft body is rotatably disposed between a first bushing and the ring body. One end of the shaft body is received in the drive housing, and the other end extends from the communication port to the outside of the drive housing and is fixedly connected to the impeller. The limiting ring is located between the ring body and the first bushing, and between the shaft body and the extension. The outer diameter of the limiting ring is larger than the inner diameter of the ring body and the inner diameter of the first bushing, respectively, so as to limit the rotating shaft in the extension direction of the shaft body. A magnetic assembly is fixed to the shaft body, wherein the stator mechanism is capable of generating a rotating magnetic field that drives the magnetic assembly to rotate, and the magnetic assembly is capable of driving the shaft to rotate.

3. The driving device according to claim 2, characterized in that, The extension is annular and coaxial with the ring body. The inner diameter of the extension is larger than the outer diameter of the limiting ring, and a gap for fluid flow is formed between the extension and the limiting ring.

4. The driving device according to claim 2, characterized in that, The first bushing has a first shaft hole, and a first guide groove is also provided on the side of the first bushing facing the limiting ring. The first guide groove communicates with the first shaft hole, and the shaft body is rotatably inserted through the first shaft hole. There is a gap between the shaft body and the first shaft hole for fluid to flow. And / or, the ring body has a second shaft hole, and a second flow guide groove is also provided on the side of the ring body facing the limiting ring. The second flow guide groove communicates with the second shaft hole, and the shaft body is rotatably inserted through the second shaft hole. There is a gap between the shaft body and the second shaft hole for fluid flow.

5. The driving device according to claim 2, characterized in that, The limiting ring has an outer ring surface and two end faces connected to the outer ring surface, and the connection between the outer ring surface and the two end faces is provided with a chamfer.

6. The driving device according to claim 1, characterized in that, The first bushing has a positioning groove, and the end of the extension that is away from the ring body is received in the positioning groove to position the second bushing.

7. The driving device according to claim 1, characterized in that, The first bushing includes a disc portion and a frustum portion formed on a surface of the disc portion. The first bushing has a first shaft hole extending from the surface of the disc portion away from the frustum portion to the end face of the frustum portion away from the disc portion. The extension portion is annular and coaxial with the annular body. The extension portion is sleeved on the frustum portion, and the end face of the extension portion away from the annular body abuts against the disc portion. The rotor is rotatably inserted through the first shaft hole.

8. The driving device according to claim 1, characterized in that, The diameter of the hole on the side of the first bushing closest to the ring body is greater than the diameter of the hole on the side of the first bushing away from the ring body; and / or, the diameter of the hole on the side of the ring body closest to the second bushing is greater than the diameter of the hole on the side of the ring body away from the ring body.

9. The driving device according to claim 1, characterized in that, The second bushing has a second shaft hole, which has a straight hole portion and a tapered hole portion communicating with the straight hole portion. The smaller end of the tapered hole portion is connected to the straight hole portion, and the larger end faces the first bushing. The rotor is rotatably inserted through the straight hole portion and the tapered hole portion.

10. The driving device according to claim 9, characterized in that, The length of the straight hole in the direction of the rotor's rotation axis is greater than or equal to 0.5 mm.

11. The driving device according to claim 1, characterized in that, The drive housing includes a housing body and a mounting housing that docks with the housing body. The first bushing and the second bushing are both mounted on the mounting housing. The stator mechanism is housed in the housing body. The communication port and the limiting part are both provided on the mounting housing. The communication port is an opening at the end of the mounting housing away from the housing body. The limiting part is located at the end of the mounting housing away from the housing body and close to the housing body.

12. The driving device according to claim 1, characterized in that, The impeller is rotatably housed in the sleeve assembly; the communication port is located on the side of the drive housing near the sleeve assembly.

13. The driving device according to claim 1, characterized in that, The rotor includes a rotating shaft and a magnetic assembly. One end of the rotating shaft is housed in the drive housing, and the other end extends out of the drive housing and is fixedly connected to the impeller. The rotating shaft is rotatable relative to the drive housing. The stator mechanism is capable of generating a rotating magnetic field that drives the magnetic assembly to rotate; the stator mechanism includes a drive stator, which is spaced apart from the rotating shaft along the axis of the rotating shaft, such that the rotating shaft does not penetrate into the drive stator.

14. The driving device according to claim 13, characterized in that, The drive stator further includes a power stator, and the drive stator and the power stator are arranged along the rotation axis of the rotating shaft. The power stator is closer to the impeller than the drive stator, and the rotating shaft is rotatably inserted through the power stator.

15. The driving device according to claim 14, characterized in that, The magnetic assembly includes a first magnet, which is fixedly connected to the rotating shaft, and the driving stator is capable of generating a rotating magnetic field that drives the first magnet to rotate; the magnetic assembly also includes a second magnet, which is fixedly connected to the rotating shaft, and the power stator is capable of generating a rotating magnetic field that drives the second magnet to rotate; both the first magnet and the second magnet are located between the driving stator and the power stator.

16. The driving device according to claim 14, characterized in that, 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, the plurality of second magnetic cores being arranged around the rotating shaft in one revolution, wherein both the first magnetic cores and the second magnetic cores include magnetic columns, and the cross-sectional area of ​​the magnetic column of the first magnetic core is larger than the cross-sectional area of ​​the magnetic column of the second magnetic core.

17. The driving device according to claim 14, characterized in that, The rotating shaft has a first mating section and a second mating section. The cross-sectional area of ​​the first mating section is larger than that of the second mating section. The first mating section is rotatably inserted into the bushing assembly, and the second mating section is rotatably inserted into the power stator.

18. A blood pump, characterized in that, include: The drive device as described in any one of claims 1 to 17; An impeller is disposed outside the drive housing, the impeller is fixedly connected to the rotor, and can rotate with the rotor.

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