Blood pump and driving device thereof

Abstract

The invention relates to the technical field of medical instruments, and provides a blood pump and a driving device thereof, and the driving device comprises a driving shell which is provided with a communication port and is internally provided with a limiting part; the rotor can be rotatably installed on the driving shell, part of the rotor is contained in the driving shell, part of the rotor is located outside the driving shell, and the rotor is fixedly connected with the impeller; the stator mechanism is accommodated in the driving shell, and the stator mechanism can generate a rotating magnetic field for driving the rotor to rotate; the shaft sleeve assembly comprises a supporting part, a separating part and a limiting part, the supporting part, the separating part and the limiting part are sequentially arranged on the driving shell along the rotating axis of the rotor, the separating part abuts against the supporting part and the limiting part, the side, away from the separating part, of the supporting part abuts against the limiting part, and the rotor penetrates through the supporting part and the limiting part; the supporting piece, the separating piece and the limiting piece can penetrate through the communicating opening. According to the driving device, the assembly of the driving device can be simplified, and the assembly precision can be improved.

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] An embodiment of the first aspect of this application provides a driving device for driving the impeller of a blood pump to rotate, comprising: A drive housing with a communication port, and a limiting part is also provided inside the drive housing; The rotor is rotatably mounted on the drive housing, with a portion of the rotor housed within the drive housing and a portion located 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. A bushing assembly includes a support member, a partition member, and a limiting member. The support member, the partition member, and the limiting member are sequentially arranged on the drive housing along the rotation axis of the rotor. The partition member abuts against the support member and the limiting member respectively. The side of the support member away from the partition member abuts against the limiting member. The rotor passes through the support member and the limiting member. The communication port allows the support member, the partition member, and the limiting member to pass through.

[0006] In some embodiments, the drive housing includes a housing body and a mounting housing that docks with the housing body, the support member, the partition member and the limiting member are mounted on the mounting housing, the stator mechanism is housed in the housing body, and the communication port and the limiting portion are both provided on the mounting housing.

[0007] In some embodiments, the limiting member is a cylindrical or annular member, the limiting member is fixedly connected to the drive housing, the limiting member is disposed near the communication port of the drive housing, a gap is formed between the limiting member and the rotor, wherein the rotor is rotatable relative to the limiting member, the limiting member has a reduced diameter section, and the gap between the limiting member and the rotor at the reduced diameter section is smaller than the gap between the remaining part of the limiting member and the rotor.

[0008] In some embodiments, the reduced diameter section is located on the side of the limiting member away from the separator.

[0009] In some embodiments, the separator is annular or cylindrical, the rotor is rotatably inserted through the separator, the support and the limiting member are both fixedly connected to the drive housing, and the support and the limiting member are tightly abutted against the separator to restrict the sliding of the separator. In some embodiments, the support member is an annular or cylindrical member, the support member is fixedly connected to the drive housing, and the rotor is rotatably disposed through the support member; Alternatively, the support member is a bearing, the support member has an outer ring and an inner ring that can rotate relative to the outer ring, the inner ring of the support member is fixedly connected to the rotor, the outer ring is fixedly connected to the drive housing, and the side of the separator away from the limiting member abuts against the outer ring of the support member.

[0010] In some embodiments, the support member is annular or cylindrical, a gap is formed between the support member and the rotor, the support member has a limiting section, and the gap between the support member and the rotor at the limiting section is smaller than the gap between the rest of the support member and the rotor.

[0011] In some embodiments, the support member is annular or cylindrical, the limiting member is annular or cylindrical, the rotor is rotatably disposed through the support member and the limiting member, there is a gap between the rotor and the support member, there is a gap between the rotor and the limiting member, wherein the minimum gap between the rotor and the support member is greater than the minimum gap between the rotor and the limiting member.

[0012] In some embodiments, 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 from the communication port to the outside of the drive housing and is fixedly connected to the impeller. The shaft is rotatable relative to the drive housing. The magnetic assembly is fixedly connected to the shaft. The stator mechanism is capable of generating a rotating magnetic field that drives the magnetic assembly to rotate, so that the magnetic assembly can drive the shaft to rotate about the axis of the shaft. A limiting ring is provided on the rotating shaft. The limiting ring is fixedly arranged around the rotating shaft. The limiting ring is located between the support member and the limiting member, and between the rotating shaft and the separator. The outer diameter of the limiting ring is larger than the inner diameter of the support member and the inner diameter of the limiting member, respectively, so as to limit the rotating shaft in the extension direction of the rotating shaft.

[0013] In some embodiments, a first fluid groove is formed on the end face of the support member facing the separator, the extension direction of the first fluid groove being perpendicular to or intersecting the extension direction of the rotating shaft; and / or, a second fluid groove is formed on the end face of the limiting member facing the separator, the extension direction of the second fluid groove being perpendicular to or intersecting the extension direction of the rotating shaft.

[0014] In some embodiments, the rotor includes a shaft and a magnetic assembly. One end of the shaft is housed in the drive housing, and the other end is located outside the drive housing and 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 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 extending direction of the rotating shaft.

[0015] In some embodiments, 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 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 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.

[0016] An embodiment of the second aspect of this application provides a blood pump, comprising: The drive device as described in the first aspect; An impeller is disposed outside the drive housing, the impeller is fixedly connected to the rotor, and can rotate with the rotor.

[0017] The driving device provided in this application has the following advantages: by sequentially installing the support member, the partition member, and the limiting member on the drive housing along the rotation axis of the rotor, with the partition member abutting against the support member and the limiting member respectively, and the side of the support member away from the partition member abutting against the limiting part inside the drive housing, and the communication port on the drive housing allowing the support member, the partition member, and the limiting member to pass through, the support member, the partition member, and the limiting member can be installed from one direction, thereby simplifying the assembly of the driving device, improving assembly accuracy, and increasing production efficiency.

[0018] The blood pump of this application embodiment has a support, a partition, and a limiting member installed sequentially on the drive housing along the rotation axis of the rotor. The partition abuts against the support and the limiting member respectively, and the side of the support away from the partition abuts against the limiting part inside the drive housing. The communication port on the drive housing allows the support, partition, and limiting member to pass through, which simplifies the assembly process of the blood pump, increases assembly accuracy, and improves production efficiency. Attached Figure Description

[0019] 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.

[0020] Figure 1 This is a schematic diagram of the blood pump structure in the first embodiment of the present invention; 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. Figure 3 yes Figure 2 The blood pump shown is a cross-sectional view along AA; Figure 4 yes Figure 1 An exploded view of the blood pump's drive mechanism; Figure 5 yes Figure 3 A partial cross-sectional view of the drive unit of the blood pump shown; Figure 6 yes Figure 1 The schematic diagram of the drive housing of the blood pump shown is omitted. Figure 7 yes Figure 6 The drive unit shown is a cross-sectional view along BB; Figure 8 yes Figure 5 The drive unit shown omits the cross-sectional view of the rotating shaft; Figure 9 yes Figure 4The diagram shows the structural schematic of the support component. Figure 10 yes Figure 4 A schematic diagram of the magnetic assembly of the drive device from another angle; Figure 11 yes Figure 10 The magnetic assembly shown is a cross-sectional view along the CC direction; Figure 12 yes Figure 10 An exploded view of the magnetic assembly shown. Figure 13 yes Figure 4 The diagram shows the structure of the shaft of the drive device. Figure 14 yes Figure 4 The diagram shows the structure of the drive stator of the drive device. Figure 15 yes Figure 2 The blood pump shown omits a schematic diagram of the catheter assembly. Figure 16 yes Figure 15 The blood pump shown is a cross-sectional view along XX; Figure 17 yes Figure 16 An enlarged view of the L section; Figure 18 yes Figure 4 Another exploded view of the drive housing of the drive unit shown; Figure 19 This is a cross-sectional view of the assembled shaft, drive housing, and bushing assembly according to the second embodiment of the present invention.

[0021] The markings in the diagram mean: 100. Blood pump; 10. Drive unit; 11. Drive housing; 11a. Connecting port; 11b. Limiting part; 11c. Housing body; 11d. Mounting housing; 114. Separating cavity; 115. Protective component; 1151. Connecting hole; 116. Mounting port; 117. Sealing cover; 12. Rotor; 121. Rotating shaft; 121a. Limiting ring; 121b. Dispensing groove; 122. Magnetic assembly; 12 22. First magnet; 1222a. First magnetic block; 1222b. Third magnetic block; 1223. Second magnet; 1223a. Second magnetic block; 1223b. Fourth magnetic block; 1224. Flywheel; 1224a. Disc-shaped part; 1224b. Tubular part; 1224c. Marking part; 1224d. Stop protrusion; 1224e. Outer ring wall; 13. Stator mechanism; 131. Drive stator 1311, First back plate; 1311a, Positioning hole; 1312, First magnetic core; 1313, First coil; 132, Power stator; 1321, Second back plate; 1322, Second magnetic core; 1323, Second coil; 14, Fixing component; 141, Positioning post; 142, Through hole; 143, Support hole; 15, Bushing assembly; 151, Support component; 151a, Limiting section; 151b, First glue placement groove; 151c, First fluid groove; 152, Separator; 153, Limiting component; 153a, Reduction section; 153b, Second glue placement groove; 153c, Second fluid groove; 16, Electrical conductor; 20, Sleeve assembly; 21, Inlet; 22, Outlet; 23, Pig tail tube; 30, Impeller; 40, Conduit assembly; 411, Cleaning pipeline; 412, Support body. Detailed Implementation

[0022] 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.

[0023] 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.

[0024] 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.

[0025] To illustrate the technical solution of this application, the following description is provided in conjunction with specific accompanying drawings and embodiments.

[0026] Please refer to Figure 1 and Figure 2 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] Please combine them together Figure 3 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.

[0031] Specifically, the cleaning fluid can be physiological saline, heparinized physiological saline, or glucose, etc.

[0032] 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.

[0033] Please combine Figure 4The 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.

[0034] Please combine Figure 4 and Figure 5 The drive housing 11 also includes a limiting part 11b. In this embodiment, the drive housing 11 includes a housing body 11c and a mounting housing 11d that abuts against the housing body 11c. Both the communication port 11a and the limiting part 11b are located on the mounting housing 11d. Specifically, both the housing body 11c and the mounting housing 11d are generally cylindrical. The limiting part 11b is an annular protrusion on the inner wall of the mounting housing 11d. One open end of the mounting housing 11d abuts against one open end of the housing body 11c, and the communication port 11a is the opening at the end of the mounting housing 11d furthest from the housing body 11c. The limiting part 11b is located at the end of the mounting housing 11d furthest from the communication port 11a, that is, the end of the mounting housing 11d closest to the housing body 11c.

[0035] The rotor 12 is rotatably mounted inside the drive housing 11. The rotor 12 is partially housed in the drive housing 11 and partially located outside the drive housing 11 and fixed to the impeller 30. The rotor 12 can drive the impeller 30 to rotate.

[0036] 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 11d, with one end housed in the housing body 11c 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 in the housing body 11c of the drive housing 11.

[0037] 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.

[0038] 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 11c of the drive housing 11. Please refer to the following: Figure 6 and Figure 7 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] Furthermore, the fixing member 14 is also provided with a support hole 143, and a support body 412 is also provided inside the catheter assembly 40. The support body 412 is used to support the catheter assembly 40 and / or the blood pump 100 when delivering the blood pump 100. One end of the support body 412 can be received in the support hole 143. Specifically, the support body 412 is, for example, a nickel-titanium wire.

[0044] Please combine Figures 3-7 The bushing assembly 15 includes a support member 151, a partition member 152, and a limiting member 153. The support member 151, partition member 152, and limiting member 153 are sequentially arranged on the drive housing 11 along the rotation axis of the rotor 12. The partition member 152 abuts against the support member 151 and the limiting member 153 respectively. The side of the support member 151 away from the partition member 152 abuts against the limiting part 11b to limit the support member 151. The rotor 12 can pass through the support member 151 and the limiting member 153. The connecting port 11a allows the support member 151, partition member 152, and limiting member 153 to pass through, so that the support member 151, partition member 152, and limiting member 153 can be installed into the mounting shell 11d 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.

[0045] In one embodiment, the support member 151 is annular or cylindrical, and the rotor 12 (specifically, the shaft 121) is rotatably disposed through the support member 151. A gap is formed between the support member 151 and the rotor 12 for the passage of cleaning fluid. In this case, the support member 151 and the shaft 121 constitute a bearing structure, and the cleaning fluid serves as a lubricant between the support member 151 and the shaft 121.

[0046] Please combine them together Figure 8 Specifically, the support member 151 has a limiting section 151a. The gap between the support member 151 and the rotor 12 (specifically, the rotating shaft 121) at the limiting section 151a is smaller than the gap between the rest of the support member 151 and the rotor 12 (specifically, the rotating shaft 121). Providing the limiting section 151a to reduce the gap between the support member 151 and the rotating shaft 121 can reduce the wobbling of the rotating shaft 121. Simultaneously, by providing the limiting section 151a, the contact area between the support member 151 and the rotating shaft 121 can be reduced when the rotating shaft 121 wobbles, thus reducing the friction between the support member 151 and the rotating shaft 121.

[0047] In one embodiment, the outer wall of the support member 151 is fixedly connected to the inner wall of the mounting shell 11d of the drive housing 11 by an adhesive. To facilitate the fixed installation of the support member 151 within the mounting shell 11d, a first adhesive groove 151b is provided on the outer circumferential surface of the support member 151. The first adhesive groove 151b allows for easy bonding and fixing of the support member 151 and the mounting shell 11d by applying adhesive within it.

[0048] It is understood that in some embodiments, the support member 151 and the drive housing 11 may not be fixedly connected, and the two ends of the support member 151 are positioned by abutting against the separator 152 and the limiting part 11b, respectively.

[0049] In one embodiment, the separator 152 is a cylindrical or annular component, and the rotor 12 is rotatably disposed through the separator 152, with a gap formed between the rotor 12 and the separator 152 for the flow of cleaning fluid. Specifically, the separator 152 is not connected to the inner wall of the drive housing 11 (i.e., it is not connected to the drive housing 11 by means of bonding, welding, etc.), but is positioned in the drive housing 11 only by its two ends abutting against the support member 151 and the limiting member 153 respectively, further simplifying the assembly of the drive device 10.

[0050] It is understood that in other embodiments, the separator 152 may also be formed by multiple arc-shaped or block-shaped parts surrounding the rotating shaft 121; or, the separator 152 may also be fixed in the drive housing 11 by means of bonding or other methods.

[0051] In one embodiment, the limiting member 153 is annular or cylindrical and is fixedly connected to the drive housing 11. The limiting member 153 is disposed at the communication port 11a of the drive housing 11. A gap is formed between the limiting member 153 and the rotor 12 (specifically, the rotating shaft 121), allowing the rotor 12 to rotate relative to the limiting member 153. In this configuration, the limiting member 153 and the rotating shaft 121 form a bearing structure, and the cleaning fluid serves as a lubricant between the limiting member 153 and the rotating shaft 121.

[0052] Specifically, the limiting member 153 has a reduced diameter section 153a. The gap between the limiting member 153 and the rotor 12 (specifically, the rotating shaft 121) at the reduced diameter section 153a is smaller than the gap between the remaining part of the limiting member 153 and the rotor 12 (specifically, the rotating shaft 121). By providing the reduced diameter section 153a to reduce the gap between the limiting member 153 and the rotating shaft 121, the shaking of the rotating shaft 121 can be reduced. At the same time, by providing the reduced diameter section 153a, the contact area between the limiting member 153 and the rotating shaft 121 can be reduced when the rotating shaft 121 shakes, thereby reducing the friction between the limiting member 153 and the rotating shaft 121.

[0053] In one embodiment, the minimum gap between the rotor 12 and the support member 151 is greater than the minimum gap between the rotor 12 and the limiting member 153. Specifically, the minimum gap between the shaft 121 and the limiting section 151a of the support member 151 is greater than the minimum gap between the shaft 121 and the limiting member 153, so as to ensure that the cleaning fluid flowing through the gap between the support member 151 and the shaft 121 can pass more smoothly. The minimum gap between the limiting member 153 and the shaft 121 is smaller to prevent blood in the sleeve assembly 20 from entering the drive device 10.

[0054] In one embodiment, the minimum gap between the limiting member 153 and the rotating shaft 121 at the reduced diameter section 153a 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 gap between the limiting member 153 and the rotating shaft 121.

[0055] Specifically, the reduced diameter section 153a is located on the side of the limiting member 153 away from the partition member 152. It can be understood that in other embodiments, the reduced diameter section 153a may also be located in the middle of the limiting member 153 in the extension direction of the rotating shaft 121. However, the reduced diameter section 153a being located on the side of the limiting member 153 away from the partition member 152 can not only limit the rotating shaft 121 and effectively prevent blood from entering the drive housing 11, but also prevent substances in the blood from accumulating in the reduced diameter section 153a.

[0056] By setting the limiting member 153, the assembly size requirements between the rotating shaft 121 and the mounting housing 11d can be reduced, while the rotational friction of the rotating shaft 121 can be decreased. Adding a support member 151 to the limiting member 153 can improve the rotational stability of the rotating shaft 121. A separator 152 between the limiting member 153 and the support member 151 can limit the movement of both members along the extension direction of the rotating shaft 121.

[0057] Specifically, the limiting member 153 is bonded and fixed to the drive housing 11. To facilitate the fixed installation of the limiting member 153 within the mounting housing 11d, a second adhesive groove 153b is provided on the outer peripheral surface of the limiting member 153. The second adhesive groove 153b allows for easy bonding and fixing of the limiting member 153 and the mounting housing 11d by placing adhesive in the second adhesive groove 153b.

[0058] In this embodiment, the rotating shaft 121 has a limiting ring 121a, which is fixedly sleeved on the rotating shaft 121. The limiting ring 121a and the rotating shaft 121 can be integrally formed, or fixed to the rotating shaft 121 by bonding, welding, or other methods. In the extending direction of the rotating shaft 121, the limiting ring 121a is located between the limiting member 153 and the support member 151. In a direction perpendicular to the extending direction of the rotating shaft 121, the limiting ring 121a is located between the rotating shaft 121 and the separator 152. The outer diameter of the limiting ring 121a is larger than the inner diameter of the limiting member 153. Simultaneously, the outer diameter of the limiting ring 121a is also larger than the inner diameter of the support member 151, thus limiting the rotating shaft 121 in the extending direction of the rotating shaft 121 and preventing large-scale movement of the rotating shaft 121 relative to the drive housing 11 in the extending direction of the rotating shaft 121.

[0059] The cleaning fluid introduced into the drive housing 11 through the cleaning pipeline 411 flows through the gap between the support member 151 and the rotating shaft 121, the gap between the limiting ring 121a and the separator 152, and the gap between the limiting member 153 and the rotating shaft 121. It then enters the sleeve assembly 20 through the connecting port 11a. This not only serves as backflushing but also as lubrication between the rotating shaft 121 and the limiting member 153, and between the rotating shaft 121 and the support member 151.

[0060] Please combine them together Figure 9 In this embodiment, a first fluid groove 151c is formed on the side of the support member 151 near the limiting ring 121a. The extending direction of the first fluid groove 151c is perpendicular to or intersects with the extending direction of the rotating shaft 121. The first fluid groove 151c connects to the gap between the support member 151 and the rotating shaft 121. A second fluid groove 153c is formed on the side of the limiting member 153 facing the limiting ring 125. The extending direction of the second fluid groove 153c is perpendicular to or intersects with the extending direction of the rotating shaft 121. The second fluid groove 153c connects to the gap between the limiting member 153 and the rotating shaft 121. This facilitates fluid flow. It should be noted that in other embodiments, a fluid groove may be provided in one of the limiting member 153 and the support member 151, or no fluid groove may be provided.

[0061] Specifically, the limiting member 153 and the supporting member 151 are made of metal, ceramic, or other materials.

[0062] Please combine again Figure 6 and Figure 7Furthermore, 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.

[0063] 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.

[0064] The flywheel 1224 is fixedly fitted onto 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.

[0065] 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.

[0066] Please combine Figure 10 and Figure 11 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 disposed on opposite sides of the disc-shaped portion 1224a, so as to facilitate 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.

[0067] Please combine Figure 11and Figure 12 Specifically, 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] In one embodiment, the flywheel 1224 is fixed to the shaft 121 by adhesive bonding. Please refer to... Figure 13 A dispensing groove 121b is provided at the end of the 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 dispensing groove 121b. In this way, glue can be arranged in the dispensing groove 121b to facilitate the fixing of the shaft 121 and the stop protrusion 1224d.

[0074] Furthermore, the dispensing groove 121b extends along a direction perpendicular to the axis of the rotating shaft 121, and the end of the dispensing groove 121b extends to the outer circumferential surface of the rotating shaft 121. This arrangement allows adhesive to be applied to the dispensing groove 121b, 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 to 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 121b.

[0075] Please combine Figure 11In 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.

[0076] 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.

[0077] 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.

[0078] Please combine Figure 6 and Figure 7 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.

[0079] 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.

[0080] 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.

[0081] Please combine Figure 7 and Figure 14 As shown, 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 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.

[0082] The cross-sectional shape of the first magnetic core 1312 and the second magnetic core 1322, which consist only of magnetic pillars, can be fan-shaped, circular, trapezoidal, or annular, etc. In the illustrated embodiment, the first magnetic core 1312 and the second magnetic core 1322, which consist only of 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.

[0083] 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.

[0084] 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.

[0085] Please combine Figures 15-17 The drive housing 11 also has a partitioned cavity 114. The drive device 10 further includes an electrical conductor 16 connected to the stator mechanism 13. A portion of the electrical conductor 16 is located between at least a portion of the magnetic assembly 122 and the drive housing 11, and the portion of the electrical conductor 16 located between the magnetic assembly 122 and the drive housing 11 is received in the partitioned cavity 114, such that the cavity wall of the partitioned cavity 114 prevents the electrical conductor 16 from contacting the magnetic assembly 122. In the illustrated embodiment, the electrical conductor 16 is electrically connected to the power stator 132, specifically, the electrical conductor 16 is electrically connected to the second coil 1323 of the power stator 132. Electrical conductors 16 are present between the first magnet 1222 and the drive housing 11, and between the second magnet 1223 and the drive housing 11. The portions of the electrical conductor 16 located between the first magnet 1222 and the drive housing 11, and between the second magnet 1223 and the drive housing 11, are all received in the partitioned cavity 114. The position of the magnetic component 122 corresponds to the position of the partition cavity 114.

[0086] The wire 16 is connected to the control unit of the drive device 10, which controls the working state of the stator mechanism 13. Specifically, one end of the wire 16 is electrically connected to the second coil 1323, and the other end is directly electrically connected to the control unit.

[0087] By setting the partition cavity 114, the electrical wire 16, which is electrically connected to the stator mechanism 13, is separated from the rotatable magnetic component 122. This effectively avoids the risk of the electrical wire 16 breaking or falling off due to the magnetic component 122 coming into contact with the electrical wire 16 during rotation, thereby further ensuring the normal use of the blood pump 100.

[0088] Furthermore, a protective member 115 is fixed inside the drive housing 11, and the protective member 115 and the drive housing 11 together enclose the partition cavity 114. The position of the protective member 115 corresponds to the position of the magnetic assembly 122, that is, the position of the protective member 115 corresponds to the position of the first magnet 1222 and the position of the second magnet 1223. The protective member 115 is located between the magnetic assembly 122 and the wire 16, and the protective member 115 prevents the wire 16 from contacting the magnetic assembly 122. That is, the protective member 115 separates the first magnet 1222, the second magnet 1223 and the flywheel 1224 outside the partition cavity 114.

[0089] Specifically, the protective component 115 has a connecting hole 1151 through which the power supply wire 16 passes, so that the power wire 16 can pass through the connecting hole 1151 and be electrically connected to the stator mechanism 13.

[0090] Please combine Figure 18 In order to facilitate the installation of the electrical wires 16 connecting the drive stator 131 and the power stator 132, the housing body 11c is also provided with an installation port 116. The drive housing 11 also includes a sealing cover 117, which covers the sealing installation port 116. The protective member 115 shields part of the installation port 116. The partition cavity 114 is formed by the sealing cover 117 and the protective member 115 together.

[0091] In some embodiments, the partition cavity 114 is not limited to being formed by providing a protective member 115. In some embodiments, the partition cavity 114 may also be a channel formed on the side wall of the drive housing 11 for the passage of the power supply wire 16.

[0092] 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 fixedly connected to the rotating shaft 121 and arranged along the axis of the rotating shaft 121. The first magnet 1222 and the second magnet 1223 are respectively mounted on the two flywheels. In this case, the position of the partition cavity 114 corresponds to the space between the flywheel mounting the first magnet 1222 and the wire 16, and between the flywheel mounting the second magnet 1223 and the wire 16, where protective members 115 are provided. It can be understood that, in this case, the rotor 12 may not have a flywheel. In this case, protective members 115 are provided between the first magnet 1222 and the wire 16, and between the second magnet 1223 and the wire 16. Alternatively, there may be only one flywheel, which is used to mount one of the first magnet 1222 and the second magnet 1223.

[0093] Alternatively, the power stator 132 is located between 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 drive stator 131. The first magnet 1222 is fixed on the flywheel between the power stator 132 and the drive stator 131, and the second magnet 1223 is fixed on the flywheel between the impeller 30 and the power stator 132. That is, 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. In this case, there is an electrical wire 16 between the first magnet 1222 and the drive housing 11. In order to avoid the electrical wire 16 from contacting the first magnet 1222 or the flywheel on which the first magnet 1222 is installed, the portion of the electrical wire 16 located between the first magnet 1222 and the drive housing 11 is housed in the partition cavity 114. Correspondingly, the protective element 115 is located between the flywheel on which the first magnet 1222 is mounted and the electrical wire 16. It can be understood that, in this case, the rotor 12 may not have a flywheel, and the protective element 115 would be located between the first magnet 1222 and the electrical wire 16.

[0094] Alternatively, in some embodiments, the rotating shaft 121 can also be configured to pass through the drive stator 131, and the rotating shaft 121 can pass through both the drive stator 131 and the power stator 132. In this case, the entire magnetic assembly 122 can be disposed between the drive stator 131 and the power stator 132. In this case, the arrangement of the partition cavity 114 can be similar to... Figure 7 , Figure 8 Alternatively, 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. In this case, there is an electrical conductor 16 between the first magnet 1222 and the drive housing 11. To prevent the electrical conductor 16 from contacting the first magnet 1222 or the flywheel on which the first magnet 1222 is mounted, the portion of the electrical conductor 16 located between the first magnet 1222 and the drive housing 11 is housed in the partition cavity 114. Correspondingly, the protective member 115 is located between the flywheel on which the first magnet 1222 is mounted and the electrical conductor 16. It is understood that, in this case, the rotor 12 may also not have a flywheel, in which case the protective member 115 is located between the first magnet 1222 and the electrical conductor 16.

[0095] Alternatively, in some embodiments, the drive device 10 has only one of the power stator 132 and the drive stator 131, and correspondingly, the magnetic assembly 122 has a magnet.

[0096] like Figure 19As shown, the drive device of the second embodiment has a structure that is largely the same as that of the drive device 10 of the first embodiment, except that the support member 151' in the bushing assembly 15' of the drive device of the second embodiment is directly replaced by a bearing. The support member 151' has an outer ring and an inner ring that can rotate relative to the outer ring. The inner ring of the support member 151' is fixedly connected to the rotor shaft 121', and the outer ring is fixedly connected to the mounting shell 11d' of the drive housing. The side of the separator 152' away from the limiting member 153' abuts against the outer ring of the support member 151'. At this time, the limiting part 11b' abuts against the outer ring of the support member 151'.

[0097] Since the drive device of the second embodiment has a similar structure to the drive device 10 of the first embodiment, it also has the effect of easy assembly.

[0098] 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 for rotating the impeller of a blood pump, characterized in that, include: A drive housing with a communication port, and a limiting part is also provided inside the drive housing; The rotor is rotatably mounted on the drive housing, with a portion of the rotor housed within the drive housing and a portion located 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. A bushing assembly includes a support member, a partition member, and a limiting member. The support member, the partition member, and the limiting member are sequentially disposed on the drive housing along the rotation axis of the rotor. The partition member abuts against the support member and the limiting member respectively. The side of the support member away from the partition member abuts against the limiting member. The rotor passes through the support member and the limiting member. The communication port allows the support member, the partition member, and the limiting member to be inserted into the drive housing from the communication port and in one direction.

2. 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 support member, the partition member, and the limiting member are 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, and the limiting part is located at the end of the mounting housing closer to the housing body.

3. The driving device according to claim 1, characterized in that, The limiting member is a cylindrical or annular member, which is fixedly connected to the drive housing. The limiting member is located near the communication port of the drive housing, and a gap is formed between the limiting member and the rotor. The rotor is able to rotate relative to the limiting member. The limiting member has a reduced diameter section, and the gap between the limiting member and the rotor at the reduced diameter section is smaller than the gap between the remaining part of the limiting member and the rotor.

4. The driving device according to claim 3, characterized in that, The reduced diameter section is located on the side of the limiting member away from the separator; or, the rotor includes a rotating shaft that can rotate relative to the drive housing and a magnetic assembly fixed to the rotating shaft, wherein the minimum gap between the reduced diameter section and the rotating shaft is less than or equal to 2 μm.

5. The driving device according to claim 1, characterized in that, The separator is annular or cylindrical, and the rotor is rotatably inserted through the separator. The support and the limiting member are both fixedly connected to the drive housing. The support and the limiting member are both in close contact with the separator to restrict the sliding of the separator.

6. The driving device according to claim 1, characterized in that, The support member is an annular or cylindrical member, and is fixedly connected to the drive housing. The rotor is rotatably inserted through the support member. Alternatively, the support member is a bearing, the support member has an outer ring and an inner ring that can rotate relative to the outer ring, the inner ring of the support member is fixedly connected to the rotor, the outer ring is fixedly connected to the drive housing, and the side of the separator away from the limiting member abuts against the outer ring of the support member.

7. The driving device according to claim 1, characterized in that, The support member is annular or cylindrical, and a gap is formed between the support member and the rotor. The support member has a limiting section, and the gap between the support member and the rotor at the limiting section is smaller than the gap between the rest of the support member and the rotor.

8. The driving device according to claim 1, characterized in that, The support member is annular or cylindrical, the limiting member is annular or cylindrical, the rotor is rotatably disposed through the support member and the limiting member, there is a gap between the rotor and the support member, there is a gap between the rotor and the limiting member, wherein the minimum gap between the rotor and the support member is greater than the minimum gap between the rotor and the limiting member.

9. 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 from the communication port to the outside of the drive housing and is fixedly connected to the impeller. The rotating shaft is rotatable relative to the drive housing. The magnetic assembly is fixedly connected to the rotating shaft. The stator mechanism is capable of generating a rotating magnetic field that drives the magnetic assembly to rotate, so that the magnetic assembly can drive the rotating shaft to rotate around the axis of the rotating shaft. A limiting ring is provided on the rotating shaft, and the limiting ring is fixedly arranged around the rotating shaft; in the extending direction of the rotating shaft, the limiting ring is located between the support member and the limiting member; in the direction perpendicular to the extending direction of the rotating shaft, the limiting ring is located between the rotating shaft and the separator; the outer diameter of the limiting ring is larger than the inner diameter of the support member and the inner diameter of the limiting member, respectively, so as to limit the rotating shaft in the extending direction of the rotating shaft.

10. The driving device according to claim 9, characterized in that, There is a gap between the limiting ring and the separator for the cleaning fluid to pass through; or, the limiting ring and the rotating shaft are integrally formed.

11. The driving device according to claim 9, characterized in that, A first fluid groove is formed on the end face of the support member facing the separator, and the extension direction of the first fluid groove is perpendicular to or intersects with the extension direction of the rotating shaft; and / or, a second fluid groove is formed on the end face of the limiting member facing the separator, and the extension direction of the second fluid groove is perpendicular to or intersects with the extension direction of the rotating shaft.

12. 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 is located outside the drive housing and fixedly connected to the impeller. The rotating shaft is rotatable relative to the drive housing, and the magnetic assembly is fixedly connected to the rotating shaft. 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, and the drive stator and the rotating shaft are spaced apart in the extending direction of the rotating shaft, such that the rotating shaft does not pass through the drive stator.

13. The driving device according to claim 12, characterized in that, The stator mechanism further includes a power stator, which and the drive stator are arranged along the axis of the rotating shaft, with the power stator being closer to the impeller than the drive stator; the rotating shaft is rotatably inserted through the power stator.

14. The driving device according to claim 13, characterized in that, The magnetic assembly includes a first magnet and a second magnet, both of which are fixed to the rotating shaft. The first magnet and the second magnet are arranged between the driving stator and the power stator. The driving 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.

15. The driving device according to claim 13, 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 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.

16. A blood pump, characterized in that, include: The drive device as described in any one of claims 1 to 15; 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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