Blood pump and drive device therefor

Abstract

The application relates to the technical field of medical devices, and provides a blood pump and a driving device thereof. The driving device comprises a driving shell with a communication port, a limiting portion is further arranged in the driving shell; a rotor is rotatably arranged in the driving shell, part of the rotor is accommodated in the driving shell, and part of the rotor is located outside the driving shell and is fixedly connected with an impeller; a stator mechanism is accommodated in the driving shell, the stator mechanism can generate a rotating magnetic field for driving the rotor to rotate; a shaft sleeve assembly comprises a supporting piece, a separating piece and a limiting piece, the supporting piece, the separating piece and the limiting piece are sequentially arranged in the driving shell along the rotating axis of the rotor, the separating piece is abutted with the supporting piece and the limiting piece respectively, and the side of the supporting piece, which is away from the separating piece, is abutted with the limiting portion, wherein the rotor is arranged through the supporting piece and the limiting piece, and the communication port can be passed through by the supporting piece, the separating piece and the limiting piece. The driving device can simplify the assembly of the driving device and improve the assembly precision.

Description

TECHNICAL FIELD

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

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

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

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

[0005] Embodiments of the first aspect of the present application provide a driving device for driving an impeller of a blood pump to rotate, comprising:

[0006] A driving shell having a communication port, and a limiting portion arranged in the driving shell;

[0007] A rotor rotatably mounted in the driving shell, part of the rotor being accommodated in the driving shell and part of the rotor being located outside the driving shell and fixedly connected with the impeller;

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

[0009] A shaft sleeve assembly comprising a support, a separator and a limiting piece, the support, the separator and the limiting piece being sequentially arranged along a rotation axis of the rotor in the driving shell, the separator being in abutment with the support and the limiting piece respectively, and a side of the support away from the separator being in abutment with the limiting portion, wherein the rotor is arranged through the support and the limiting piece, and the communication port is capable of allowing the support, the separator and the limiting piece to pass through.

[0010] In some embodiments, the driving shell comprises a shell body and a mounting shell in abutment with the shell body, the support, the separator and the limiting piece are mounted in the mounting shell, the stator mechanism is accommodated in the shell body, and the communication port and the limiting portion are arranged in the mounting shell.

[0011] In some embodiments, the limiting member is a cylindrical member or a ring-shaped member, the limiting member is fixed to the driving shell, the limiting member is arranged close to the communication opening of the driving shell, and 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 limiting member and the rotor at other sections.

[0012] In some embodiments, the reduced diameter section is located on a side of the limiting member away from the partition.

[0013] In some embodiments, the partition is ring-shaped or cylindrical, the rotor is rotatably arranged in the partition, the support member and the limiting member are both fixed to the driving shell, and the support member and the limiting member are both in close contact with the partition to limit the sliding of the partition.

[0014] In some embodiments, the support member is a ring-shaped member or a cylindrical member, the support member is fixed to the driving shell, and the rotor is rotatably arranged in the support member.

[0015] Alternatively, the support member is a bearing, the support member has an outer ring and an inner ring rotatable relative to the outer ring, the inner ring of the support member is fixed to the rotor, the outer ring of the support member is fixed to the driving shell, and a side of the partition away from the limiting member is in contact with the outer ring of the support member.

[0016] In some embodiments, the support member is ring-shaped or cylindrical, a gap is formed between the support member and the rotor, and the support member has a limiting section, wherein the gap between the support member and the rotor at the limiting section is smaller than the gap between the support member and the rotor at other sections.

[0017] In some embodiments, the support member is ring-shaped or cylindrical, the limiting member is ring-shaped or cylindrical, the rotor is rotatably arranged in the support member and the limiting member, a gap is formed between the rotor and the support member, and a gap is formed 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.

[0018] In some embodiments, the rotor comprises a rotating shaft and a magnetic assembly, one end of the rotating shaft is received in the driving shell, the other end of the rotating shaft extends out of the driving shell from the communication opening and is fixed to the impeller, the rotating shaft is rotatable relative to the driving shell, the magnetic assembly is fixed to the rotating shaft, and the stator mechanism can generate a rotating magnetic field to drive the magnetic assembly to rotate, so that the magnetic assembly can drive the rotating shaft to rotate around the axis of the rotating shaft.

[0019] The rotation shaft is provided with a limiting ring, the limiting ring is fixedly arranged around the rotation shaft, the limiting ring is located between the support and the limiting piece, and the limiting ring is located between the rotation shaft and the partition piece. The outer diameter of the limiting ring is greater than the inner diameter of the support and the inner diameter of the limiting piece, so as to limit the rotation shaft in the extension direction of the rotation shaft.

[0020] In some embodiments, a first fluid groove is formed on the end surface of the support facing the partition piece, and the extension direction of the first fluid groove is perpendicular to or intersects with the extension direction of the rotation shaft; and / or, a second fluid groove is formed on the end surface of the limiting piece facing the partition piece, and the extension direction of the second fluid groove is perpendicular to or intersects with the extension direction of the rotation shaft.

[0021] In some embodiments, the rotor comprises a rotation shaft and a magnetic assembly, one end of the rotation shaft is accommodated in the drive shell, the other end is located outside the drive shell and is fixedly connected with the impeller, the rotation shaft can rotate relative to the drive shell, the magnetic assembly comprises a first magnet and a second magnet, and the first magnet and the second magnet are both fixedly connected with the rotation shaft.

[0022] The stator mechanism comprises a drive stator and a power stator, the drive stator and the power stator are arranged along the axis of the rotation shaft, the drive stator can generate a rotating magnetic field to drive the first magnet to rotate, and the power stator can generate a rotating magnetic field to drive the second magnet to rotate; wherein the first magnet is located between the drive stator and the power stator, the rotation shaft passes through the power stator, and the drive stator is spaced apart from the rotation shaft in the extension direction of the rotation shaft.

[0023] In some embodiments, the drive stator comprises a plurality of first magnetic cores and a plurality of first coils wound around the plurality of first magnetic cores, respectively, and the plurality of first magnetic cores are arranged around a straight line where the axis of the rotation shaft is located; the power stator comprises a plurality of second magnetic cores and a plurality of second coils wound around the plurality of second magnetic cores, respectively, and the plurality of second magnetic cores are arranged around the rotation shaft, wherein the first magnetic core and the second magnetic core both comprise a magnetic column, and the cross-sectional area of the magnetic column of the first magnetic core is greater than the cross-sectional area of the magnetic column of the second magnetic core.

[0024] Embodiments of the second aspect of the application provide a blood pump, comprising:

[0025] The driving device as claimed in the first aspect;

[0026] The impeller is arranged outside the drive shell, the impeller is fixedly connected with the rotor and can rotate with the rotor.

[0027] The driving device provided by the embodiment of the present application has the beneficial effects that: the support member, the partition member and the limiting member are sequentially installed along the rotation axis of the rotor to the driving shell, and the partition member abuts against the support member and the limiting member, the side of the support member away from the partition member abuts against the limiting portion in the driving shell, and the communication opening on the driving shell can be passed through by the support member, the partition member and the limiting member, so that 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 the assembly accuracy and improving the production efficiency.

[0028] The blood pump of the embodiment of the present application has the beneficial effects that: the support member, the partition member and the limiting member are sequentially installed along the rotation axis of the rotor to the driving shell, and the partition member abuts against the support member and the limiting member, the side of the support member away from the partition member abuts against the limiting portion in the driving shell, and the communication opening on the driving shell can be passed through by the support member, the partition member and the limiting member, so that the assembly process of the blood pump is simple, the assembly accuracy is high, and the production efficiency is high. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative labor.

[0030] Figure 1 is a structural schematic diagram of a blood pump in the first embodiment of the present application;

[0031] Figure 2 is Figure 1 is a structural schematic diagram of a blood pump omitting part of the cannula assembly and the pigtail in the first embodiment of the present application;

[0032] Figure 3 is Figure 2 is a sectional view of the blood pump along A-A in the first embodiment of the present application;

[0033] Figure 4 is Figure 1 is an exploded view of the driving device of the blood pump in the first embodiment of the present application;

[0034] Figure 5 is Figure 3 is a partial sectional view of the driving device of the blood pump in the first embodiment of the present application;

[0035] Figure 6 is Figure 1 is a structural schematic diagram of the driving device of the blood pump omitting the driving shell in the first embodiment of the present application;

[0036] Figure 7 is Figure 6 is a sectional view of the driving device along B-B in the first embodiment of the present application;

[0037] Figure 8 is a sectional view of the driving device shown in Figure 5 ;

[0038] Figure 9 is a structural schematic view of the support shown in Figure 4 ;

[0039] Figure 10 is a structural schematic view of the magnetic assembly of the driving device shown in Figure 4 ;

[0040] Figure 11 is a sectional view of the magnetic assembly along C-C shown in Figure 10 ;

[0041] Figure 12 is an exploded view of the magnetic assembly shown in Figure 10 ;

[0042] Figure 13 is a structural schematic view of the rotating shaft of the driving device shown in Figure 4 ;

[0043] Figure 14 is a structural schematic view of the driving stator of the driving device shown in Figure 4 ;

[0044] Figure 15 is a structural schematic view of the blood pump shown in Figure 2 , omitting the catheter assembly;

[0045] Figure 16 is a sectional view of the blood pump along X-X shown in Figure 15 ;

[0046] Figure 17 is an enlarged view of the L part shown in Figure 16 ;

[0047] Figure 18 is another exploded view of the driving shell of the driving device shown in Figure 4 ;

[0048] Figure 19 is a sectional view of the assembled rotating shaft, driving shell mounting shell and shaft sleeve assembly of the second embodiment provided by the present application.

[0049] The meanings of the marks in the figures are as follows:

[0050] 100, blood pump; 10, driving device; 11, driving shell; 11a, communication port; 11b, limiting part; 11c, shell body; 11d, mounting shell; 114, separation cavity; 115, protection piece; 1151, communication hole; 116, mounting port; 117, sealing cover; 12, rotor; 121, rotating shaft; 121a, limiting ring; 121b, glue dispensing groove; 122, magnetic assembly; 1222, 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 part; 1224b, tubular part; 1224c, identification part; 1224d, stop protrusion; 1224e, outer ring wall; 13, stator mechanism; 131, driving 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 piece; 141, positioning column; 142, through hole; 143, support hole; 15, shaft sleeve assembly; 151, support piece; 151a, limiting section; 151b, first glue dispensing groove; 151c, first fluid groove; 152, separation piece; 153, limiting piece; 153a, reduced diameter section; 153b, second glue dispensing groove; 153c, second fluid groove; 16, electric wire; 20, sleeve assembly; 21, inflow port; 22, outflow port; 23, pigtail; 30, impeller; 40, catheter assembly; 411, cleaning pipeline; 412, support body. DETAILED DESCRIPTION

[0051] In order to make the objects, technical solutions and advantages of the present application clearer, the following further describes the present application with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely used to explain the present application and should not be used to limit the present application.

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

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

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

[0055] Please refer to Figure 1 and Figure 2 The first embodiment of the present application provides a blood pump 100, which comprises a driving device 10, a cannula assembly 20 and an impeller 30. The cannula assembly 20 is connected with the driving device 10; the impeller 30 is rotatably accommodated in the cannula assembly 20; the impeller 30 is connected with the driving device 10, and the driving device 10 can drive the impeller 30 to rotate to realize the blood pumping function of the blood pump 100.

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

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

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

[0059] Please refer to Figure 3 Further, the blood pump 100 further comprises a catheter assembly 40, which is connected with the driving device 10, and the catheter assembly 40 is provided with a supply line, which comprises a cleaning line 411 for supplying a cleaning fluid to the driving device 10. Specifically, in the illustrated embodiment, the driving device 10 is located between the cannula assembly 20 and the catheter assembly 40.

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

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

[0062] Please refer to Figure 4The driving shell 11 has a communication port 11a. The communication port 11a is located on the side of the driving shell 11 close to the sleeve assembly 20. Specifically, the communication port 11a communicates the driving shell 11 and the sleeve assembly 20. The impeller 30 is arranged outside the driving shell 11. The cleaning fluid in the cleaning line 411 can flow through the inside of the driving shell 11, and flow into the sleeve assembly 20 from the communication port 11a, so as to prevent blood from penetrating into the driving shell 11 from the communication port 11a of the driving shell 11.

[0063] Please refer to Figure 4 and Figure 5 The driving shell 11 further has a limiting portion 11b. In the embodiment, the driving shell 11 includes a shell body 11c and a mounting shell 11d connected to the shell body 11c. The communication port 11a and the limiting portion 11b are arranged on the mounting shell 11d. Specifically, the shell body 11c and the mounting shell 11d are both substantially cylindrical. The limiting portion 11b is an annular protrusion arranged on the inner wall of the mounting shell 11d. One open end of the mounting shell 11d is connected to one open end of the shell body 11c. The communication port 11a is an opening at one end of the mounting shell 11d away from the shell body 11c. The limiting portion 11b is located at one end of the mounting shell 11d away from the communication port 11a, i.e. one end of the mounting shell 11d close to the shell body 11c.

[0064] The rotor 12 is rotatably arranged in the driving shell 11. The rotor 12 is partially accommodated in the driving shell 11 and partially arranged outside the driving shell 11 and fixedly connected to the impeller 30. The rotor 12 can drive the impeller 30 to rotate.

[0065] Specifically, the rotor 12 includes a rotating shaft 121 and a magnetic assembly 122. One end of the rotating shaft 121 is accommodated in the driving shell 11, and the other end extends out of the driving shell 11 from the communication port 11a and is fixedly connected to the impeller 30. The rotating shaft 121 can rotate relative to the driving shell 11. The magnetic assembly 122 is fixedly connected to the rotating shaft 121. Specifically, the rotating shaft 121 is arranged in the mounting shell 11d, one end of the rotating shaft 121 is accommodated in the shell body 11c, and the other end extends out of the driving shell 11 from the communication port 11a and is fixedly connected to the impeller 30. The magnetic assembly 122 is arranged in the shell body 11c of the driving shell 11.

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

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

[0068] Please refer to Figure 6 and Figure 7 The magnetic assembly 122 comprises a first magnet 1222, which is fixed to the rotating shaft 121. The stator mechanism 13 comprises a driving stator 131, which is spaced apart from the rotating shaft 121 along the axis of the rotating shaft 121, i.e., the rotating shaft 121 does not pass into the driving stator 131. The driving 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. Wherein, the driving stator 131 is spaced apart from the rotating shaft 121 along the axis of the rotating shaft 121, i.e., the rotating shaft 121 does not pass into the driving stator 131, which can make the cross section of the driving stator 131 perpendicular to the axis of the rotating shaft 121 larger, the magnetic flux of the rotating magnetic field generated by the driving stator 131 larger, and the torque on the first magnet 1222 larger, thereby reducing the current required by the driving stator 131 to drive the rotating shaft 121 to rotate, and ensuring that the blood pump 100 has lower power consumption and generates less heat.

[0069] Specifically, the driving stator 131 comprises a first back plate 1311, a plurality of first magnetic cores 1312, and a plurality of first coils 1313 respectively arranged around the first magnetic cores 1312. The first back plate 1311 is fixed in the driving shell 11. The plurality of first magnetic cores 1312 are arranged around the axis of the rotating shaft 121. Specifically, the extension direction of each first magnetic core 1312 is parallel to the extension direction of the rotating shaft 121. One end of each first magnetic core 1312 is fixed to the first back plate 1311, and the other end extends to near the first magnet 1222. The first coil 1313 can generate a rotating magnetic field that interacts with the first magnet 1222, thereby causing the first magnet 1222 to rotate to drive the rotating shaft 121 to rotate, and the impeller 30 to rotate with the rotating shaft 121.

[0070] It should be noted that in some embodiments, the driving stator 131 can also not have the first back plate 1311. The first back plate 1311 plays a role in closing the magnetic circuit to facilitate and increase the generation of magnetic flux of the driving stator 131 and improve the coupling ability. Since the first back plate 1311 can increase the magnetic flux, the first back plate 1311 is beneficial to reduce 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, and in some embodiments, the first back plate 1311 and the first magnetic core 1312 are made of soft magnetic material, such as cobalt steel.

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

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

[0073] Further, the fixing member 14 is also provided with a support hole 143, and the catheter assembly 40 is also provided with a support body 412, the support body 412 is used for supporting the catheter assembly 40 and / or the blood pump 100 during transportation of the blood pump 100, and one end of the support body 412 can be accommodated in the support hole 143. Specifically, the support body 412 is, for example, a nickel-titanium wire.

[0074] Please combine Figures 3 to 7 The shaft sleeve assembly 15 includes a support member 151, a partition member 152 and a limiting member 153, the support member 151, the partition member 152 and the limiting member 153 are sequentially arranged along the rotating axis of the rotor 12 in the driving shell 11, the partition member 152 respectively abuts against the support member 151 and the limiting member 153, and the side of the support member 151 away from the partition member 152 abuts against the limiting portion 11b, so as to limit the support member 151, wherein the rotor 12 can be arranged in the support member 151 and the limiting member 153, the communication opening 11a can be passed through by the support member 151, the partition member 152 and the limiting member 153, so that the support member 151, the partition member 152 and the limiting member 153 can be loaded into the installation shell 11d of the driving shell 11 from the communication opening 11a, which can facilitate assembly of the driving device 10, improve assembly accuracy and improve production efficiency.

[0075] In one of the embodiments, the support member 151 is annular or cylindrical, and the rotor 12 (specifically, the rotating shaft 121) can be rotatably arranged in the support member 151. A gap for passing the cleaning fluid is formed between the support member 151 and the rotor 12. At this time, the support member 151 and the rotating shaft 121 constitute a bearing structure, and the cleaning fluid serves as a lubricant between the support member 151 and the rotating shaft 121.

[0076] Please combine Figure 8Specifically, the support 151 has a limiting section 151a, and the gap between the support 151 at the limiting section 151a and the rotor 12 (specifically, the rotating shaft 121) is smaller than the gap between the rest of the support 151 and the rotor 12 (specifically, the rotating shaft 121). The limiting section 151a is arranged to reduce the gap between the support 151 and the rotating shaft 121, thereby reducing the wobble of the rotating shaft 121. In addition, the limiting section 151 can also reduce the contact area between the support 151 and the rotating shaft 121 when the rotating shaft 121 wobbles, thereby reducing the friction between the support 151 and the rotating shaft 121.

[0077] In one embodiment, the outer wall of the support 151 is fixedly connected to the inner wall of the mounting shell 11d of the driving shell 11 by an adhesive. To facilitate the mounting of the support 151 in the mounting shell 11d, a first adhesive groove 151b is arranged on the outer circumferential surface of the support 151. The first adhesive groove 151b can facilitate the bonding of the support 151 and the mounting shell 11d by arranging an adhesive in the first adhesive groove 151b.

[0078] It can be understood that, in some embodiments, the support 151 and the driving shell 11 can also not be fixedly connected, and the two ends of the support 151 are positioned by abutting against the partition 152 and the limiting portion 11b, respectively.

[0079] In one embodiment, the partition 152 is a cylindrical member or an annular member, the rotor 12 is rotatably arranged in the partition 152, and a gap is formed between the rotor 12 and the partition 152 for the cleaning fluid to flow through. Specifically, the partition 152 is not connected to the inner wall of the driving shell 11 (i.e., not connected to the driving shell 11 by bonding, welding, or the like), but is positioned in the driving shell 11 by abutting against the support 151 and the limiting member 153 at the two ends of the partition 152, thereby further simplifying the assembly of the driving device 10.

[0080] It can be understood that, in other embodiments, the partition 152 can also be a plurality of arc-shaped members or block-shaped members arranged around the rotating shaft 121, or the partition 152 can be fixed in the driving shell 11 by bonding or the like.

[0081] In one embodiment, the limiting member 153 is annular or cylindrical, and the limiting member 153 is fixedly connected to the driving shell 11. The limiting member 153 is arranged at the communication port 11a of the driving shell 11. Specifically, a gap is formed between the limiting member 153 and the rotor 12 (specifically, the rotating shaft 121), and the rotor 12 can rotate relative to the limiting member 153. At this time, the limiting member 153 and the rotating shaft 121 form a bearing structure, and the cleaning fluid acts as a lubricant between the limiting member 153 and the rotating shaft 121.

[0082] Specifically, the limiting member 153 has a reduced diameter section 153a, and the gap between the reduced diameter section 153a and the rotor 12 (specifically, the rotating shaft 121) is smaller than the gap between the rest of the limiting member 153 and the rotor 12 (specifically, the rotating shaft 121). The reduced diameter section 153a is provided to reduce the gap between the limiting member 153 and the rotating shaft 121, thereby reducing the wobble of the rotating shaft 121. In addition, the reduced diameter section 153a can also reduce the contact area between the limiting member 153 and the rotating shaft 121 when the rotating shaft 121 wobbles, thereby reducing the friction between the limiting member 153 and the rotating shaft 121.

[0083] 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 rotating shaft 121 and the limiting section 151a of the support member 151 is greater than the minimum gap between the rotating shaft 121 and the limiting member 153, so that the cleaning fluid flowing through the gap between the support member 151 and the rotating shaft 121 can flow more smoothly, and the minimum gap between the limiting member 153 and the rotating shaft 121 is small to prevent blood in the sleeve assembly 20 from entering the drive device 10.

[0084] 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 (about 8 μm in diameter and about 2 μm in thickness) cannot enter a gap with a width less than or equal to 2 μm, and the reverse flushing cleaning fluid passes through this gap, the 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.

[0085] 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 can also be located at the middle of the limiting member 153 in the extension direction of the rotating shaft 121. However, the reduced diameter section 153a located on the side of the limiting member 153 away from the partition member 152 not only limits the rotating shaft 121 and effectively prevents blood from entering the interior of the drive housing 11, but also prevents substances in the blood from accumulating at the reduced diameter section 153a.

[0086] The limiting member 153 can reduce the assembly size requirement of the rotating shaft 121 and the mounting housing 11d, and reduce the rotational friction of the rotating shaft 121. The support member 151 provided on the basis of the limiting member 153 can improve the stability of the rotation of the rotating shaft 121. The partition member 152 provided between the limiting member 153 and the support member 151 can limit the limiting member 153 and the support member 151 in the extension direction of the rotating shaft 121.

[0087] Specifically, the limiting member 153 is adhesively fixed to the driving shell 11. In order to facilitate the fixing of the limiting member 153 in the mounting shell 11d, a second adhesive groove 153b is arranged on the outer circumferential surface of the limiting member 153. The second adhesive groove 153b can facilitate the adhesion of the limiting member 153 and the mounting shell 11d by arranging adhesive in the second adhesive groove 153b.

[0088] In the present embodiment, the rotating shaft 121 is provided with a limiting ring 121a fixedly sleeved on the rotating shaft 121. The limiting ring 121a and the rotating shaft 121 can be integrally formed, or fixed by adhesion, welding or the like. In the extending direction of the rotating shaft 121, the limiting ring 121a is located between the limiting member 153 and the supporting member 151, and in the direction perpendicular to the extending direction of the rotating shaft 121, the limiting ring 121a is located between the rotating shaft 121 and the partition member 152. The outer diameter of the limiting ring 121a is greater than the inner diameter of the limiting member 153, and the outer diameter of the limiting ring 121a is also greater than the inner diameter of the supporting member 151, so as to limit the rotating shaft 121 in the extending direction of the rotating shaft 121, and avoid the rotating shaft 121 from moving relative to the driving shell 11 in the extending direction of the rotating shaft 121.

[0089] The cleaning fluid introduced from the cleaning pipeline 411 into the interior of the driving shell 11 flows through the gap between the supporting member 151 and the rotating shaft 121, the gap between the limiting ring 121a and the partition member 152, and the gap between the limiting member 153 and the rotating shaft 121, and then enters the sleeve assembly 20 through the communication port 11a, which not only plays a backwashing role, but also plays a lubricating role between the rotating shaft 121 and the limiting member 153, and between the rotating shaft 121 and the supporting member 151.

[0090] Please combine Figure 9 In the present embodiment, a first fluid groove 151c is arranged on the side of the supporting member 151 close to the limiting ring 121a, and the extending direction of the first fluid groove 151c is perpendicular or intersects with the extending direction of the rotating shaft 121. The first fluid groove 151c is communicated to the gap between the supporting member 151 and the rotating shaft 121. A second fluid groove 153c is arranged on the side of the limiting member 153 facing the limiting ring 121a, and the extending direction of the second fluid groove 153c is perpendicular or intersects with the extending direction of the rotating shaft 121. The second fluid groove 153c is communicated to the gap between the limiting member 153 and the rotating shaft 121. In this way, the fluid can flow. It should be noted that in other embodiments, a fluid groove can be arranged on one of the limiting member 153 and the supporting member 151, or no fluid groove can be arranged.

[0091] Specifically, the limiting member 153 and the supporting member 151 are made of metal, ceramic or the like.

[0092] Please combine againFigure 6 and Figure 7 Further, the magnetic assembly 122 further comprises a second magnet 1223 fixedly connected with the rotating shaft 121; the stator mechanism 13 further comprises a power stator 132, the power stator 132 and the driving stator 131 are arranged along the axis of the rotating shaft 121, and the power stator 132 is closer to the impeller 30 than the driving stator 131, that is, in the extension direction of the rotating shaft 121, the power stator 132 is arranged between the impeller 30 and the driving stator 131. Wherein, the rotating shaft 121 is rotatably arranged in the power stator 132, and the power stator 132 can generate a rotating magnetic field interacting with the second magnet 1223. The driving stator 131 and the power stator 132 can drive the first magnet 1222 and the second magnet 1223 to rotate respectively, so that the driving stator 131 and the power stator 132 can jointly drive the rotating shaft 121 to rotate around the axis of the rotating shaft 121, thereby driving the impeller 30 to rotate, so as to provide greater driving force for the rotation of the impeller 30.

[0093] In the illustrated embodiment, the first magnet 1222 and the second magnet 1223 are arranged between the driving stator 131 and the power stator 132. Specifically, the magnetic assembly 122 further comprises a flywheel 1224 fixedly connected with the rotating shaft 121, the flywheel 1224 is located between the power stator 132 and the driving stator 131, and the first magnet 1222 and the second magnet 1223 are both arranged on the flywheel 1224.

[0094] The flywheel 1224 is fixedly sleeved on the end of the rotating shaft 121 away from the impeller 30. Wherein, the flywheel 1224 and the rotating shaft 121 can be integrally formed, or fixedly connected by bonding, welding or the like.

[0095] By arranging the flywheel 1224, the connection strength of the magnet and the rotating shaft 121 can be increased, and the stability of the rotation of the rotating shaft 121 can be improved. In addition, by arranging the first magnet 1222 and the second magnet 1223 on the same flywheel 1224, the shaking of the rotating shaft 121 during rotation can be reduced, so that the rotating shaft 121 is more stable during rotation.

[0096] Please refer to Figure 10 and Figure 11 The flywheel 1224 comprises a disc-shaped portion 1224a and a tubular portion 1224b, the tubular portion 1224b is fixedly arranged in the middle of the disc-shaped portion 1224a and coaxial with the disc-shaped portion 1224a, the end of the rotating shaft 121 away from the impeller 30 is fixedly received in the tubular portion 1224b, and the first magnet 1222 and the second magnet 1223 are arranged on the two opposite sides of the disc-shaped portion 1224a respectively, so as to facilitate the assembly of the first magnet 1222 and the second magnet 1223, and to better fix the first magnet 1222 and the second magnet 1223 with the rotating shaft 121.

[0097] Please refer to Figure 11 and Figure 12 , specifically, the first magnet 1222 and the second magnet 1223 are both annular Halbach array magnets. The first magnet 1222 includes a plurality of first magnetic blocks 1222a magnetized in a direction parallel to the axis of the first magnet 1222, and the second magnet 1223 includes a plurality of second magnetic blocks 1223a magnetized in a direction parallel to the axis of the second magnet 1223. The plurality of second magnetic blocks 1223a and the plurality of first magnetic blocks 1222a are arranged on opposite sides of the disc-shaped portion 1224a around the rotation shaft 121. In the extension direction of the rotation shaft 121, each second magnetic block 1223a is arranged opposite a first magnetic block 1222a, and the polarities of the opposite second magnetic block 1223a and the first magnetic block 1222a on the side facing the disc-shaped portion 1224a are opposite. Such an arrangement facilitates the installation of the first magnet 1222 and the second magnet 1223, avoiding the problem of mutual repulsion between the magnetic blocks of the first magnet 1222 and the magnetic blocks of the second magnet 1223, which makes assembly difficult.

[0098] In some embodiments, the first magnet 1222 further includes a plurality of third magnetic blocks 1222b magnetized in a circumferential direction of the first magnet 1222, and the circumferentially magnetized third magnetic blocks 1222b and the first magnetic blocks 1222a magnetized in a direction parallel to the axis of the first magnet 1222 are alternately arranged along the circumference of the first magnet 1222. Among them, the magnetization directions of adjacent first magnetic blocks 1222a are opposite, for example, the magnetization direction of one of the adjacent first magnetic blocks 1222 is from the side of the first magnetic block 1222a facing away from the disc-shaped portion 1224a to the side facing the disc-shaped portion 1224a, and the magnetization direction of the other is from the side of the first magnetic block 1222a facing the disc-shaped portion 1224a to the side facing away from the disc-shaped portion 1224a. The magnetization directions of adjacent third magnetic blocks 1222b are opposite on the circumference of the first magnet 1222.

[0099] Correspondingly, the second magnet 1223 further includes a plurality of fourth magnetic blocks 1223b magnetized in a circumferential direction of the second magnet 1223, and the fourth magnetic blocks 1223b and the second magnetic blocks 1223a are alternately arranged along the circumference of the second magnet 1223. Among them, the magnetization directions of adjacent second magnetic blocks 1223a are opposite, and the magnetization directions of adjacent fourth magnetic blocks 1223b are opposite on the circumference of the second magnet 1223.

[0100] It should be noted that the magnetization directions of the third magnetic blocks 1222b and the fourth magnetic blocks 1223b are not limited to being circumferentially magnetized, and in some embodiments, the magnetization directions of the third magnetic blocks 1222b and the fourth magnetic blocks 1223b can also be inclined relative to the axis of the rotation shaft 121.

[0101] In this embodiment, the first magnet 1222 and the second magnet 1223 are each provided with eight magnetic blocks, i.e., the first magnetic block 1222a, the second magnetic block 1223a, the third magnetic block 1222b and the fourth magnetic block 1223b are each four. The first magnetic block 1222a, the second magnetic block 1223a, the third magnetic block 1222b and the fourth magnetic block 1223b are each a fan ring-shaped magnet, and the first magnet 1222 and the second magnet 1223 are approximately in a circular ring structure. It can be understood that in other embodiments, the first magnet 1222 and the second magnet 1223 can also be composed of more or less magnetic blocks, such as two, four, six or ten, etc.

[0102] In order to facilitate the installation of the first magnet 1222 and the second magnet 1223, the flywheel 1224 is further provided with an identification part 1224c for determining the installation position of the first magnetic block 1222a and the installation position of the second magnetic block 1223a. The identification part 1224c can be provided as a groove, a scale or a mark, etc. When installing the first magnetic block 1222a and the second magnetic block 1223a, as long as the position of one of the first magnetic blocks 1222a and one of the second magnetic blocks 1223a is identified by the identification part 1224c, the installation position of the remaining magnetic blocks can be determined, thereby facilitating the installation of the first magnet 1222 and the second magnet 1223. Specifically, the identification part 1224c can be on at least one of the tubular part 1224b and the disc-shaped part 1224a.

[0103] In one embodiment, the flywheel 1224 is fixed to the rotating shaft 121 by adhesion. Please refer to Figure 13 The end of the rotating shaft 121 away from the impeller 30 is provided with a glue groove 121b, and the inner wall of the tubular part 1224b is provided with a stop protrusion 1224d abutting against the glue groove 121b. In this way, glue can be arranged in the glue groove 121b to facilitate the fixed connection of the rotating shaft 121 and the stop protrusion 1224d.

[0104] Further, the glue groove 121b extends in a direction perpendicular to the axis of the rotating shaft 121, and the end of the glue groove 121b extends to the outer circumferential surface of the rotating shaft 121. In this way, glue can be arranged in the glue groove 121b, and the glue overflows to the outer circumferential surface of the rotating shaft 121 to bond the inner circumferential wall of the tubular part 1224b and the circumferential surface of the rotating shaft 121, so that the rotating shaft 121 and the flywheel 1224 can be better fixed, or it is also convenient for the excess glue between the rotating shaft 121 and the tubular part 1224b to overflow into the glue groove 121b.

[0105] Please refer to Figure 11In the embodiment, the flywheel 1224 further comprises an outer ring wall 1224e surrounding the disc-shaped portion 1224a. The outer ring wall 1224e, the tubular portion 1224b and the disc-shaped portion 1224a jointly define a first accommodating portion and a second accommodating portion for accommodating the first magnet 1222 and the second magnet 1223 respectively, and the first accommodating portion and the second accommodating portion are separated by the disc-shaped portion 1224a. Such arrangement can limit the first magnet 1222 and the second magnet 1223, which is convenient for mounting the first magnet 1222 and the second magnet 1223, and makes the first magnet 1222 and the second magnet 1223 more stable in combination with the flywheel 1224.

[0106] In the embodiment, in the axial direction of the tubular portion 1224b, the side of the first magnet 1222 away from the disc-shaped portion 1224a is higher than the outer ring wall 1224e by a distance, and the side of the second magnet 1223 away from the disc-shaped portion 1224a is higher than the outer ring wall 1224e by a distance, which is convenient for assembling the first magnet 1222 and the second magnet 1223 on the flywheel 1224.

[0107] It should be noted that the flywheel 1224 is not limited to the above structure. In some embodiments, the flywheel 1224 does not have the outer ring wall 1224e. In some embodiments, the flywheel 1224 does not have the outer ring wall 1224e and the tubular portion 1224b, and the shaft 121 is fixedly arranged in the disc-shaped portion 1224a, for example, the center of the disc-shaped portion 1224a. Compared with the flywheel 1224 having only the disc-shaped portion 1224a, the tubular portion 1224b can make the flywheel 1224 more stably connected with the shaft 121.

[0108] Please refer to 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 comprises a second back plate 1321, a plurality of second magnetic cores 1322 and a plurality of second coils 1323. The plurality of second magnetic cores 1322 are arranged around the shaft 121 at intervals. The extension direction of each second magnetic core 1322 is parallel to the axis of the shaft 121. One end of each second magnetic core 1322 is fixedly connected to the second back plate 1321, and the other end extends to be close to the second magnet 1223. In other words, in the axial direction of the shaft 121, the drive stator 131 and the power stator 132 are arranged reversely. Each second coil 1323 is wound on the corresponding second magnetic core 1322. The second coil 1323 can generate a rotating magnetic field interacting with the second magnet 1223.

[0109] The first magnetic core 1312 and the second magnetic core 1322 include magnetic columns, the first coil 1313 is wound on the magnetic column of the first magnetic core 1312, and the second coil 1323 is wound on the magnetic column of the second magnetic core 1322. The cross-sectional area of the magnetic column of the first magnetic core 1312 is greater than the cross-sectional area of the magnetic column of the second magnetic core 1322.

[0110] The greater the cross-sectional area of the magnetic column, the greater the generated magnetic flux, the greater the torque of the stator on the magnet, and the smaller the required current, which is conducive to reducing power consumption and reducing heat generation. Since the middle part of the power stator 132 passes through the rotating shaft 121, it is limited by the radial size of the blood pump 100, which limits the cross-sectional area of the second magnetic core 1322, while the middle part of the driving stator 131 does not pass through the rotating shaft 121, so that the first magnetic core 1312 can select a larger cross-sectional area, in other words, such an arrangement can reduce power consumption and reduce heat generation of the driving device 10.

[0111] Please refer to Figure 7 and Figure 14 In the present embodiment, the first magnetic core 1312 and the second magnetic core 1322 each only have a magnetic column, i.e., the first magnetic core 1312 and the second magnetic core 1322 each do not have a head part (i.e., a pole shoe) with a relatively large width, and the width of the first magnetic core 1312 and the second magnetic core 1322 is constant in the length direction thereof, 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 the magnetic core provided with a pole shoe, the present application can reduce magnetic loss, 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 the condition of equal current) and the torque of the power stator 132 on the second magnet 1223 (under the condition of equal current). In addition, the first magnetic core 1312 and the second magnetic core 1322 without the head part can greatly reduce the problem of motor power reduction caused by local magnetic short circuit due to contact between adjacent magnetic cores.

[0112] The cross-sectional shape of the first magnetic core 1312 and the second magnetic core 1322 each only having a magnetic column can be a sector shape, a circular shape, a trapezoidal shape, a sector ring shape, etc. In the illustrated embodiment, the first magnetic core 1312 and the second magnetic core 1322 each only having a magnetic column are substantially triangular prisms, and one edge of each magnetic core faces the axis of the rotating shaft 121. In the present embodiment, the edges of the first magnetic core 1312 and the second magnetic core 1322 are rounded, which facilitates subsequent winding of the coil and is conducive to protecting the insulation material wrapped on the coil.

[0113] It can be understood that in other embodiments, the first magnetic core 1312 and the second magnetic core 1322 can also include a head arranged at one end of the magnetic column, the first back plate 1311 is combined with the end of the magnetic column of the first magnetic core 1312 away from the head; the second back plate 1321 is combined with the end of the magnetic column of the second magnetic core 1322 away from the head. Alternatively, in some embodiments, one of the first magnetic core 1312 and the second magnetic core 1322 can have both a magnetic column and a head, and the other can have only a magnetic column.

[0114] In order to avoid the cleaning fluid being contaminated and / or the elements in the driving device 10 being corroded, the driving stator 131 and the power stator 132 of the driving device 10 are each wrapped with a waterproof sealing film. The material of the waterproof sealing film can be silicone, glue, etc.

[0115] Please refer to Figures 15 to 17 The driving shell 11 also has a separate partition cavity 114. The driving device 10 further includes an electric wire 16, which is connected with the stator mechanism 13, part of the electric wire 16 is located between the at least partial magnetic assembly 122 and the driving shell 11, and the part of the electric wire 16 located between the magnetic assembly 122 and the driving shell 11 is accommodated in the partition cavity 114, so that the cavity wall of the partition cavity 114 prevents the electric wire 16 from contacting the magnetic assembly 122. In the illustrated embodiment, the electric wire 16 is electrically connected with the power stator 132, specifically, the electric wire 16 is electrically connected with the second coil 1323 of the power stator 132. The electric wire 16 is located between the first magnet 1222 and the driving shell 11, and between the second magnet 1223 and the driving shell 11, the part of the electric wire 16 located between the first magnet 1222 and the driving shell 11, and the part of the electric wire 16 located between the second magnet 1223 and the driving shell 11 are all accommodated in the partition cavity 114. The position of the magnetic assembly 122 corresponds to the position of the partition cavity 114.

[0116] The electric wire 16 is connected with the control unit of the driving device 10, and the control unit is used to control the working state of the stator mechanism 13. Specifically, one end of the electric wire 16 is electrically connected with the second coil 1323, and the other end is directly electrically connected with the control unit.

[0117] By arranging the partition cavity 114, the electric wire 16 electrically connected with the stator mechanism 13 is separated from the rotatable magnetic assembly 122, which can effectively avoid the risk of the electric wire 16 being broken or falling off due to the electric wire 16 rotating with the magnetic assembly 122 when the magnetic assembly 122 rotates, thereby further ensuring the normal use of the blood pump 100.

[0118] Further, the drive shell 11 is provided with a shielding member 115, which cooperates with the drive shell 11 to define a partition cavity 114. The shielding member 115 is located corresponding to the magnetic assembly 122, i.e. the shielding member 115 is located corresponding to the first magnet 1222 and the second magnet 1223. The shielding member 115 is located between the magnetic assembly 122 and the electric wire 16, and the shielding member 115 prevents the electric wire 16 from contacting the magnetic assembly 122. That is, the shielding member 115 separates the first magnet 1222, the second magnet 1223 and the flywheel 1224 from the partition cavity 114.

[0119] Specifically, the shielding member 115 is provided with a communication hole 1151 through which the electric wire 16 is arranged to pass, so that the electric wire 16 can pass through the communication hole 1151 to electrically connect the stator mechanism 13.

[0120] Please refer to Figure 18 In order to facilitate the installation of the electric wire 16 connecting the drive stator 131 and the power stator 132, the shell body 11c is further provided with a mounting opening 116, and the drive shell 11 further comprises a sealing cover 117, which is arranged on the sealing mounting opening 116. The shielding member 115 shields part of the mounting opening 116, and the partition cavity 114 is at least partially formed by the sealing cover 117 and the shielding member 115.

[0121] In some embodiments, the partition cavity 114 is not limited to being formed by the shielding member 115. In some embodiments, the partition cavity 114 can also be a channel provided on the side wall of the drive shell 11 for the electric wire 16 to pass through.

[0122] It should be noted that the drive device 10 is not limited to the above structure. In some embodiments, the drive device 10 has two flywheels, both of which are arranged between the power stator 132 and the drive stator 131, and 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 installed on the two flywheels. At this time, the partition cavity 114 is located corresponding to the first magnet 1222 and the second magnet 1223, and the shielding member 115 is arranged between the flywheel on which the first magnet 1222 is installed and the electric wire 16, and between the flywheel on which the second magnet 1223 is installed and the electric wire 16. It can be understood that at this time, the rotor 12 can also not have a flywheel. At this time, the shielding member 115 is arranged between the first magnet 1222 and the electric wire 16, and between the second magnet 1223 and the electric wire 16. Alternatively, the flywheel is one, which is used to install one of the first magnet 1222 and the second magnet 1223.

[0123] 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, i.e. 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, at this time, the electric wire 16 between the first magnet 1222 and the drive shell 11 is accommodated in the partition cavity 114 in order to avoid the electric wire 16 contacting the first magnet 1222 or the flywheel on which the first magnet 1222 is installed. Correspondingly, the protective member 115 is located between the flywheel on which the first magnet 1222 is installed and the electric wire 16. It can be understood that at this time, the rotor 12 can also not have a flywheel, and the protective member 115 is located between the first magnet 1222 and the electric wire 16.

[0124] Alternatively, in some embodiments, the rotating shaft 121 can also be arranged to pass through the drive stator 131, and the rotating shaft 121 passes through the drive stator 131 and the power stator 132, at this time, the entire magnetic assembly 122 can be arranged between the drive stator 131 and the power stator 132, at this time, the partition cavity 114 can be arranged in a manner similar to Figure 7 、 Figure 8 Alternatively, the power stator 132 is located between the first magnet 1222 and the second magnet 1223, or the drive stator 131 and the power stator 132 are both located between the first magnet 1222 and the second magnet 1223, at this time, the electric wire 16 between the first magnet 1222 and the drive shell 11 is accommodated in the partition cavity 114 in order to avoid the electric wire 16 contacting the first magnet 1222 or the flywheel on which the first magnet 1222 is installed. Correspondingly, the protective member 115 is located between the flywheel on which the first magnet 1222 is installed and the electric wire 16. It can be understood that at this time, the rotor 12 can also not have a flywheel, at this time, the protective member 115 is located between the first magnet 1222 and the electric wire 16.

[0125] Alternatively, in some embodiments, the drive device 10 only has one of the power stator 132 and the drive stator 131, and correspondingly, the magnetic assembly 122 has one magnet.

[0126] As Figure 19As shown, the driving device of the second embodiment is substantially the same as the driving device 10 of the first embodiment in structure, except that the support 151' in the shaft sleeve assembly 15' of the driving device of the second embodiment is directly replaced by a bearing. The support 151' has an outer ring and an inner ring rotatable relative to the outer ring, the inner ring of the support 151' is fixedly connected with the rotating shaft 121' of the rotor, the outer ring is fixedly connected with the mounting shell 11d' of the driving shell, and the side of the partition 152' away from the limiting piece 153' abuts against the outer ring of the support 151'. At this time, the limiting part 11b' abuts against the outer ring of the support 151'.

[0127] Since the driving device of the second embodiment is similar in structure to the driving device 10 of the first embodiment, it also has the effect of being convenient to assemble.

[0128] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present 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 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. 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. The magnetic assembly includes a first magnet and a second magnet, both of which are fixedly connected to the rotating 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 extension direction of the rotating shaft, so that the rotating shaft does not pass into the drive stator. 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.

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.

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.

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. 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.

10. 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.

11. A blood pump, characterized in that, include: The drive device as described in any one of claims 1 to 10; 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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