CN114870242A

CN114870242A - Blood pump and driving device thereof

Info

Publication number: CN114870242A
Application number: CN202210169758.2A
Authority: CN
Inventors: 谢端卿; 余顺周
Original assignee: Shenzhen Core Medical Technology Co Ltd
Current assignee: Shenzhen Core Medical Technology Co Ltd
Priority date: 2022-02-23
Filing date: 2022-02-23
Publication date: 2022-08-09
Also published as: WO2023160424A1

Abstract

The application relates to a blood pump and a driving device thereof, wherein the driving device comprises a driving shell, a rotor, a stator component and a shaft sleeve component, and the driving shell is provided with a communicating port and a limiting part; the rotor can be rotatably arranged on the driving shell, part of the rotor is accommodated in the driving shell, and part of the rotor extends out of the driving shell and is fixedly connected with the impeller; the stator mechanism is accommodated in the driving shell and can generate a rotating magnetic field for driving the rotor to rotate; the axle sleeve subassembly is including installing in the first axle sleeve and the second axle sleeve of drive shell, the rotation axis setting of rotor is followed to first axle sleeve and second axle sleeve, one in first axle sleeve and the second axle sleeve and spacing portion butt, the second axle sleeve is including ring body and the extension that extends from the ring body, extension and first axle sleeve butt to make ring body and first axle sleeve interval, wherein, first axle sleeve and ring body can be worn to locate to the rotor can rotate, the intercommunication mouth can supply first axle sleeve and second axle sleeve to pass. The driving device is convenient to install and has high assembly precision.

Description

Blood pump and driving device thereof

Technical Field

The application relates to the technical field of medical equipment, in particular to a blood pump and a driving device thereof.

Background

An intravascular blood pump, a device designed to be inserted percutaneously into a patient's blood vessel, is advanced into the patient's heart as either a left ventricular assist device or a right ventricular assist device, and may also be referred to as an intracardiac blood pump.

The existing intravascular blood pump mainly comprises an impeller and a motor for driving the impeller to rotate, wherein the motor generates a rotating magnetic field when working, and a magnet which interacts with the rotating magnetic field is arranged on the impeller so as to enable the impeller to rotate around the axis of the impeller and convey blood from a blood inflow port to a blood outflow port of the blood pump. However, the intravascular blood pump is difficult to assemble due to its small size.

Disclosure of Invention

The application provides a blood pump and a driving device thereof, which can enable the assembling process of the blood pump to be simpler and more convenient.

A drive device capable of driving rotation of an impeller of a blood pump, comprising:

the driving shell is provided with a communication port and a limiting part;

the rotor can be rotatably arranged on the driving shell, part of the rotor is accommodated in the driving shell, part of the rotor extends out of the driving shell, and the rotor is fixedly connected with the impeller;

a stator mechanism housed in the drive case, the stator mechanism being capable of generating a rotating magnetic field that drives the rotor to rotate; and

the shaft sleeve assembly comprises a first shaft sleeve and a second shaft sleeve which are installed on the driving shell, the first shaft sleeve and the second shaft sleeve are arranged along the rotation axis of the rotor, one of the first shaft sleeve and the second shaft sleeve is abutted to the limiting portion, the second shaft sleeve comprises a ring body and an extending portion extending out of the ring body, the extending portion is abutted to the first shaft sleeve, so that the ring body is spaced from the first shaft sleeve, the rotor can rotatably penetrate through the first shaft sleeve and the ring body, and the connecting port can allow the first shaft sleeve and the second shaft sleeve to penetrate through.

In one embodiment, the rotor comprises:

the rotating shaft comprises a shaft body and a limiting ring annularly arranged on the shaft body, the shaft body can rotatably penetrate through the first shaft sleeve and the ring body, one end of the shaft body is accommodated in the driving shell, the other end of the shaft body extends out of the driving shell from the communication port and is fixedly connected with the impeller, the limiting ring is positioned between the ring body and the first shaft sleeve, the limiting ring is positioned between the shaft body and the extending part, and the outer diameter of the limiting ring is respectively larger than the inner diameter of the ring body and the inner diameter of the first shaft sleeve so as to limit the rotating shaft in the extending direction of the shaft body;

the magnetic assembly is fixedly connected to the shaft body, wherein the stator mechanism can generate a rotating magnetic field for driving the magnetic assembly to rotate, and the magnetic assembly can drive the rotating shaft to rotate.

In one embodiment, the extension is annular, the extension is coaxial with the ring body, the inner diameter of the extension is larger than the outer diameter of the stop collar, and a gap for fluid communication is formed between the extension and the stop collar.

In one embodiment, the first shaft sleeve has a first shaft hole, a first guide groove is further formed in one side of the first shaft sleeve facing the limit ring, the first guide groove is communicated with the first shaft hole, the shaft body can rotatably penetrate through the first shaft hole, and a gap for fluid to flow through is formed between the shaft body and the first shaft hole;

and/or the ring body is provided with a second shaft hole, one side of the ring body, which faces the limiting ring, is also provided with a second diversion trench, the second diversion trench is communicated with the second shaft hole, the shaft body can rotatably penetrate through the second shaft hole, and a gap for fluid circulation is formed between the shaft body and the second shaft hole.

In one embodiment, the limiting ring is provided with an outer ring surface and two end surfaces connected with the outer ring surface, and the connecting part of the outer ring surface and the two end surfaces is provided with a chamfer.

In one embodiment, the first sleeve is provided with a positioning groove, and one end of the extending portion, which is far away from the ring body, is accommodated in the positioning groove to position the second sleeve.

In one embodiment, the first bushing includes a disk portion and a boss portion formed on a surface of the disk portion, and the first bushing has a first shaft hole extending from the surface of the disk portion away from the boss portion to an end surface of the boss portion away from an end of the disk portion; the extension part is annular, the extension part is coaxial with the ring body, the extension part is sleeved on the circular table part, the end face of one end, far away from the ring body, of the extension part is abutted against the disc part, and the rotor can rotatably penetrate through the first shaft hole.

In one embodiment, the aperture of the side of the first sleeve close to the ring body is larger than the aperture of the side of the first sleeve away from the ring body; and/or the aperture of one side of the ring body close to the second shaft sleeve is larger than that of one side of the ring body away from the ring body.

In one embodiment, the second bushing has a second shaft hole, the second shaft hole has a straight hole portion and a tapered hole portion communicating with the straight hole portion, the smaller end of the tapered hole portion communicates with the straight hole portion, the larger end of the tapered hole portion faces the first bushing, and the rotor is rotatably inserted through the straight hole portion and the tapered hole portion.

In one embodiment, a length of the straight hole portion in a rotational axis direction of the rotor is greater than or equal to 0.5 mm.

In one embodiment, the driving shell includes a shell body and a mounting shell abutting against the shell body, the first shaft sleeve and the second shaft sleeve are both mounted on the mounting shell, the stator mechanism is accommodated in the shell body, and the communication port and the limiting portion are both disposed on the mounting shell.

In one embodiment, the rotor includes a rotating shaft and a magnetic assembly, one end of the rotating shaft is accommodated in the driving shell, the other end of the rotating shaft extends out of the driving shell and is fixedly connected with the impeller, the rotating shaft can rotate relative to the driving shell, the magnetic assembly includes a first magnet and a second magnet, and the first magnet and the second magnet are fixedly connected with the rotating shaft;

the stator mechanism comprises a driving stator and a power stator, the driving stator and the power stator are arranged along the rotation axis of the rotating shaft, the driving stator can generate a rotating magnetic field for driving the first magnet to rotate, and the power stator can generate a rotating magnetic field for driving the second magnet to rotate; the first magnet is located between the driving stator and the power stator, the rotating shaft penetrates through the power stator, and the driving stator is spaced from the rotating shaft in the extending direction of the rotating shaft.

In one embodiment, the driving stator comprises a plurality of first magnetic cores and a plurality of first coils respectively wound around the plurality of first magnetic cores, and the plurality of first magnetic cores are arranged around a straight line where the rotation axis of the rotating shaft is located; the power stator includes a plurality of second magnetic cores and twines a plurality ofly respectively a plurality of second coils that the second magnetic core set up, it is a plurality of the second magnetic core encircles the pivot sets up a week, wherein, first magnetic core with the second magnetic core all includes the column magnet, first magnetic core the cross sectional area of column magnet is greater than the second magnetic core the cross sectional area of column magnet.

In one embodiment, the rotating shaft has a first matching section and a second matching section, the cross-sectional area of the first matching section is larger than that of the second matching section, the first matching section is rotatably arranged in the shaft sleeve assembly in a penetrating mode, and the second matching section is rotatably arranged in the power stator in a penetrating mode.

A blood pump, comprising:

the above-described driving device;

and the impeller is arranged outside the driving shell, is fixedly connected with the rotor and can rotate along with the rotor.

The driving device of the blood pump is used for supporting the first shaft sleeve and the second shaft sleeve of the rotor to be arranged along the rotating axis of the rotor, one of the first shaft sleeve and the second shaft sleeve is abutted with the limiting piece of the driving shell to support one of the first shaft sleeve and the second shaft sleeve, the ring body of the second shaft sleeve, which supports the rotor, is abutted with the first shaft sleeve through the extending part of the second bearing to support the separating ring body and the first shaft sleeve to better support the rotor, and the extending part and the ring body are integrated, so that the assembly of parts can be reduced, and the assembly of the driving device can be simplified; the communicating opening is further formed to allow the first shaft sleeve and the second shaft sleeve to pass through, so that the first shaft sleeve and the second shaft sleeve can be installed in the installation shell of the driving shell from the communicating opening, and the driving device is more convenient to assemble; and the above structural design makes the driving device not only simple and convenient to assemble, but also can improve the assembly precision of the driving device and improve the production efficiency.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

FIG. 1 is a schematic diagram of a blood pump according to an embodiment;

FIG. 2 is a schematic structural view of the blood pump of FIG. 1 with a portion of the cannula assembly and pigtail omitted;

FIG. 3 is a cross-sectional view of the blood pump of FIG. 2 taken along A-A;

FIG. 4 is a schematic structural view of a drive device of the blood pump shown in FIG. 1;

FIG. 5 is a schematic view of another angle of the drive shown in FIG. 4;

FIG. 6 is a cross-sectional view of the drive assembly shown in FIG. 5 taken along line B-B;

FIG. 7 is a schematic view of another angle of the drive shown in FIG. 4;

FIG. 8 is a cross-sectional view of the drive assembly shown in FIG. 7 taken along line C-C;

FIG. 9 is an exploded view of the drive assembly shown in FIG. 4;

FIG. 10 is a cross-sectional view of the spindle, the bushing assembly and the mounting housing of the drive assembly shown in FIG. 6;

FIG. 11 is a structural schematic view of another angle of the first sleeve of the sleeve assembly of the drive assembly shown in FIG. 9;

FIG. 12 is a structural schematic view at another angle of a second bushing of the bushing assembly of the drive shown in FIG. 9;

FIG. 13 is a cross-sectional view of the bushing assembly of the drive shown in FIG. 10;

FIG. 14 is a sectional view of a rotating shaft of the driving device shown in FIG. 9;

FIG. 15 is a cross-sectional view of the spindle, the boss assembly and the mounting housing of the drive arrangement shown in FIG. 8;

FIG. 16 is a schematic view of another angular configuration of the magnet assembly of the rotor of the drive shown in FIG. 9;

FIG. 17 is a cross-sectional view of the magnet assembly shown in FIG. 16 taken along line D-D;

FIG. 18 is an exploded view of the magnet assembly shown in FIG. 16;

fig. 19 is a schematic view of another angle of the driving stator of the driving apparatus shown in fig. 9.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be described in further detail below with reference to the accompanying drawings, which are embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be 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 be indirectly connected to the other element.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating 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 the present application, "a plurality" means two or more unless specifically limited otherwise.

In order to explain the technical solution of the present application, the following description is made with reference to the specific drawings and examples.

Referring to fig. 1-3, a first embodiment of the present application provides a blood pump 100 including a drive device 10, a cannula assembly 20, and an impeller 30. The sleeve assembly 20 is connected with the driving device 10; the impeller 30 is rotatably housed in the sleeve assembly 20; the impeller 30 is connected with the driving device 10, and the driving device 10 can drive the impeller 30 to rotate so as to realize the blood pumping function of the blood pump 100.

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

More specifically, one end of the cannula assembly 20 is connected to the drive device 10, and the other end may be provided with a pigtail 23, the pigtail 23 being used to stabilize the position of the blood pump 100 in the heart and provide atraumatic support for the heart tissue.

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

Further, the blood pump 100 further comprises a catheter assembly 40, the catheter assembly 40 being connected to the drive device 10, a supply line being provided in the catheter assembly 40, the supply line comprising a cleaning line 411 for letting cleaning fluid through the drive device 10. Specifically, in the illustrated embodiment, the drive device 10 is positioned between the cannula assembly 20 and the catheter assembly 40.

Specifically, the cleaning fluid may be physiological saline, physiological saline containing heparin, glucose, or the like.

Referring to fig. 3 to fig. 9, 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 drive device 10 includes a drive case 11, a rotor 12, a stator mechanism 13, a stator 14, and a boss assembly 15.

The drive case 11 has a communication port 11 a. The communication port 11a is located on a side of the drive housing 11 close to the ferrule assembly 20. Specifically, the communication port 11a communicates the drive housing 11 and the ferrule assembly 20. The impeller 30 is disposed outside the drive case 11. The cleaning fluid introduced into the cleaning line 411 can flow through the interior of the driving housing 11 and flow into the cannula assembly 20 through the communication port 11a, so as to prevent blood from permeating into the driving housing 11 through the communication port 11a of the driving housing 11.

Referring to fig. 10, a limiting portion 11b is further disposed in the driving housing 11. In this embodiment, the driving housing 11 includes a housing body 111 and an installation housing 112 abutting against the housing body 111, and the communication port 11a and the limiting portion 11b are both provided in the installation housing 112. Specifically, the case body 111 and the mounting case 112 are each substantially cylindrical. The stopper 11b is an annular projection provided on the inner wall of the mounting case 112. An open end of the mounting case 112 is butted against an open end of the case body 111, and the communication port 11a is an opening of an end of the mounting case 112 remote from the case body 111. The limiting portion 11b is located at one end of the mounting shell 112 far away from the communication port 11a, that is, one end of the mounting shell 112 close to the shell body 111.

The rotor 12 is rotatably mounted on the driving housing 11, a portion of the rotor 12 is accommodated in the driving housing 11, a portion of the rotor 12 extends out of the driving housing 11 and is fixedly connected to the impeller 30, and the rotor 12 can drive the impeller 30 to rotate.

Referring to fig. 3, 6, 8 and 9, 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, the other end of the rotating shaft extends from the communication port 11a to the outside of the driving shell 11 and is fixedly connected to the impeller 30, the rotating shaft 121 can rotate relative to the driving shell 11, and the magnetic assembly 122 is fixedly connected to the rotating shaft 121. Specifically, the rotating shaft 121 is inserted into the mounting case 112, one end of the rotating shaft is accommodated in the case body 111, and the other end of the rotating shaft extends from the communication port 11a to the outside of the driving case 11 and is fixedly connected to the impeller 30. The magnet assembly 122 is located in the case body 111 of the driving case 11.

Specifically, the rotating shaft 121 is made of a material such as ceramic or stainless steel, for example, Alumina Toughened Zirconia (ATZ) or SUS316L, so as to prevent the rotating shaft 121 from being broken.

The stator mechanism 13 is housed in the drive case 11, and the stator mechanism 13 can generate a rotating magnetic field that rotates the rotor 12. Specifically, the stator mechanism 13 can generate a rotating magnetic field for driving 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 case body 111 of the drive case 11.

In one embodiment, the magnetic assembly 122 includes a first magnet 1222, and the first magnet 1222 is fixed to the shaft 121. The stator mechanism 13 includes a driving stator 131, and the driving stator 131 and the rotating shaft 121 are disposed at an interval along an axis of the rotating shaft 121, that is, the rotating shaft 121 does not penetrate into the driving stator 131. The driving stator 131 can generate a rotating magnetic field interacting with the first magnet 1222, so that the first magnet 1222 can rotate the rotating shaft 121 around the axis of the rotating shaft 121, thereby rotating the impeller 30. The driving stator 131 and the rotating shaft 121 are arranged at intervals along the axis of the rotating shaft 121, that is, the rotating shaft 121 does not penetrate into the driving stator 131, so that the cross section of the driving stator 131 in the direction perpendicular to the axial direction of the rotating shaft 121 is larger, the magnetic flux of the rotating magnetic field generated by the driving stator 131 is larger, and the torque of the first magnet 1222 is also larger, thereby reducing the current required by the driving stator 131 when the rotating shaft 121 is driven to rotate, and ensuring that the blood pump 100 has lower power consumption and less heat generation.

Specifically, the driving stator 131 includes a first back plate 1311, a plurality of first cores 1312, and a plurality of first coils 1313 respectively disposed around the first cores 1312. The first back plate 1311 is fixed inside the driving case 11. The first magnetic cores 1312 are disposed around the axis of the rotating shaft 121 at intervals. Specifically, the extending direction of each first core 1312 is parallel to the extending direction of the rotating shaft 121. One end of each first magnetic core 1312 is fixedly connected to the first back plate 1311, and the other end extends to be close to the first magnet 1222. The first coil 1313 is capable of generating a rotating magnetic field that interacts with the first magnet 1222 to cause the first magnet 1222 to rotate the shaft 121, and the impeller 30 rotates with the shaft 121.

It is noted that, in some embodiments, the driving stator 131 may not have the first back plate 1311. The first back plate 1311 functions to close the magnetic circuit to promote and increase the generation of the magnetic flux of the driving stator 131, improving the coupling capability. Since the first back plate 1311 is able to increase the magnetic flux, providing the first back plate 1311 facilitates 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, 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.

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

Specifically, the fixing member 14 has a through hole 142, the through hole 142 communicates with the inner cavity of the driving housing 11, and the through hole 142 is used for accommodating one end of the cleaning pipeline 411.

Furthermore, a supporting hole 143 is formed on the fixing member 14, and a supporting member (not shown) is further disposed in the conduit assembly 40, and is used for supporting the conduit assembly 40 and/or the blood pump 100 when the blood pump 100 is transported, and one end of the supporting member can be received in the supporting hole 143. In particular, the support member is, for example, a nitinol wire.

Referring to fig. 10 again, the bushing assembly 15 includes a first bushing 152 and a second bushing 154 mounted on the driving housing 11, the first bushing 152 and the second bushing 154 are disposed along the rotation axis of the rotor 12, one of the first bushing 152 and the second bushing 154 abuts against the limiting portion 11b, and the rotor 12 rotatably passes through the first bushing 152 and the second bushing 154. The communication port 11a is configured to allow the first boss 152 and the second boss 154 to pass therethrough. The communication opening 11a is provided to allow the first sleeve 152 and the second sleeve 154 to pass through, so that the first sleeve 152 and the second sleeve 154 can be installed in the mounting case 112 of the driving case 11 from the communication opening 11a, which can facilitate the assembly of the driving device 10 and improve the assembly precision and the production efficiency. Specifically in the illustrated embodiment, the first bushing 152 and the second bushing 154 are both mounted in the mounting housing 112; the second boss 154 is closer to the communication port 11a than the first boss 152; the first shaft sleeve 152 abuts against the limiting part 11 b; the rotating shaft 121 is rotatably inserted through the first bushing 152 and the second bushing 154.

The first sleeve 152 and the rotating shaft 121 together constitute a bearing structure. The first shaft sleeve 152 has a first shaft hole 152a, the rotor 12 (specifically, the rotating shaft 121) is rotatably inserted into the first shaft hole 152a, and a gap through which a fluid (for example, a cleaning fluid) flows is formed between a hole wall of the first shaft hole 152a and the rotating shaft 121.

Referring to fig. 11, in particular, the first shaft sleeve 152 includes a disc portion 1522 and a circular table portion 1524 formed on a surface of the disc portion 1522, and the first shaft hole 152a extends from the surface of the disc portion 1522 away from the circular table portion 1524 to an end surface of the circular table portion 1524 away from one end of the disc portion 1522. The disk portion 1522 abuts against the stopper portion 11b on the side away from the boss portion 1524.

Referring to fig. 10, 12 and 13, the second sleeve 154 and the rotating shaft 121 together form a bearing structure. The second sleeve 154 includes a ring body 1542 and an extension 1544 extending from the ring body 1542, i.e., the ring body 1542 and the extension 1544 form an integral component. The ring body 1542 and the extension 1544 form an integral part, which simplifies assembly of the drive device 10 and stabilizes the rotation shaft 121 during rotation. The extension 1544 abuts against the first sleeve 152 to space the ring body 1542 from the first sleeve 152, thereby positioning the relative position of the first sleeve 152 and the ring body 1542, and the rotor 12 is rotatably inserted through the ring body 1542. Specifically, the ring body 1542 has a second shaft hole 154a, the rotating shaft 121 is rotatably inserted into the second shaft hole 154a, and a gap through which a fluid (e.g., a cleaning fluid) flows is provided between a hole wall of the second shaft hole 154a and the rotating shaft 121.

Specifically, in the illustrated embodiment, the extension portion 1544 is annular, the extension portion 1544 is coaxial with the ring body 1542, the extension portion 1544 is sleeved on the circular table portion 1524, and an end surface of one end of the extension portion 1544, which is far away from the ring body 1542, abuts against the disc portion 1522. Wherein, the outer diameter of the circular table portion 1524 is matched with the inner diameter of the extending portion 1544.

Referring to fig. 9 and 10 again, the rotating shaft 121 further includes a shaft body 1212 and a limiting ring 1214 annularly disposed on the shaft body 1212, the shaft body 1212 is rotatably disposed through the first shaft sleeve 152 and the ring body 1542, one end of the shaft body 1212 is accommodated in the driving shell 11, and the other end of the shaft body 1212 extends from the communication port 11a to the outside of the driving shell 11 and is fixedly connected to the impeller 30; the limiting ring 1214 is located between the ring body 1542 and the first sleeve 152, and the limiting ring 1214 is located between the shaft body 1212 and the extension portion 1544, and an outer diameter of the limiting ring 1214 is respectively greater than an inner diameter of the ring body 1542 and an inner diameter of the first sleeve 152, so as to limit the rotating shaft 121 in the extending direction of the shaft body 1212, and prevent the rotating shaft 121 from moving greatly relative to the driving housing 11 in the extending direction of the rotating shaft 121.

The inner diameter of the extension 1544 is larger than the outer diameter of the stop ring 1214, and a gap for fluid communication is formed between the extension 1544 and the stop ring 1214. The cleaning fluid introduced into the driving housing 11 from the cleaning line 411 flows through the gap between the first shaft hole 152a and the rotating shaft 121, the gap between the retainer ring 121a and the extension portion 1544, and the gap between the hole wall of the second shaft hole 154a and the rotating shaft 121, and enters the sleeve assembly 20 from the communication port 11a, so that the back washing function can be achieved, and the lubrication function between the rotating shaft 121 and the first shaft sleeve 152 and between the rotating shaft 121 and the second shaft sleeve 154 can be achieved.

Referring to fig. 11 to 13 again, specifically, a first guiding groove 152b is further formed on a side of the first shaft sleeve 152 facing the limiting ring 1214, and the first guiding groove 152b is communicated with the first shaft hole 152 a. Since the first guide groove 152b is disposed on a side of the first sleeve 152 facing the retainer ring 1214, the first guide groove 152b is also communicated to a gap between the extending portion 1544 and the retainer ring 1214, and the first guide groove 152b can facilitate fluid circulation, thereby reducing an influence on the fluid circulation when the retainer ring 1214 abuts against the first sleeve 152. Specifically, the first guide groove 152b is opened on a side of the circular table portion 1524 away from the disc portion 1522.

Specifically, a second guide groove 154b is further formed in a side of the ring body 1542 of the second shaft sleeve 154, which faces the retainer ring 1214, and the second guide groove 154b is communicated with the second shaft hole 154 a. Since the second guide groove 154b is disposed on the side of the ring body 1542 facing the retainer ring 1214, the second guide groove 154b is also communicated to the gap between the extension portion 1544 and the retainer ring 1214, and the second guide groove 154b can facilitate the fluid to flow between the gap between the extension portion 1544 and the retainer ring 1214 and the second shaft hole 154a, thereby reducing the influence on the fluid flow when the retainer ring 1214 abuts against the ring body 1542.

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

It is understood that the extension 1544 is not limited to be annular, and in one embodiment, the extension 1544 is a rod-shaped structure, the extension 1544 is multiple, the multiple extensions 1544 are disposed around the rotation axis of the rotor, the first sleeve 152 further has a positioning groove, and an end of the extension 1544 away from the ring body 1542 is received in the positioning groove to position the second sleeve 154.

Specifically, the aperture of the side of the first bushing 152 proximate to the ring body 1542 is larger than the aperture of the side of the first bushing 152 facing away from the ring body 1542. With the arrangement, the contact area between the first shaft sleeve 152 and the rotating shaft 121 can be smaller, friction is reduced, flow of fluid is facilitated, and the shaking amplitude of the rotating shaft 121 is reduced.

Specifically, the aperture of the side of the ring body 1542 proximate the first boss 152 is larger than the aperture of the side of the ring body 1542 facing away from the first boss 152. So set up, not only can be less the area of contact between ring body 1542 and the pivot 121, reduce friction, be favorable to the flow of fluid moreover to and reduce the range of rocking of pivot 121 and prevent that the blood in sleeve subassembly 20 from getting into in driving shell 11 through second shaft hole 154 a.

In one embodiment, the gap between the end of the ring body 1542 remote from the first sleeve 152 and the rotating shaft 121 is less than or equal to 2 μm. Since the smallest red blood cells (about 8 μm in diameter and about 2 μm in thickness) are difficult to enter the gap having a width of less than or equal to 2 μm, and the back-flushed cleaning fluid passes through the gap, the blood is prevented from entering the interior of the drive case 11 through the second axial hole 154 a.

Specifically, the second shaft hole 154a includes a straight hole portion 154c and a tapered hole portion 154d communicating with the straight hole portion 154c, the smaller end of the tapered hole portion 154d communicates with the straight hole portion 154c, the larger end faces the ring body 1542, and the rotor 12 (specifically, the rotating shaft 121) is rotatably inserted into the straight hole portion 154c and the tapered hole portion 154 d.

Specifically, the length of the straight hole portion 154c in the rotational axis direction of the rotor 12 is greater than or equal to 0.5 mm. That is, in the illustrated embodiment, the length of the straight hole portion 154c in the extending direction of the rotation shaft 121 is greater than or equal to 0.5 mm to better support the rotation shaft 121.

In the illustrated embodiment, the first shaft hole 152a also has a straight hole portion and a tapered hole portion, similar to the second shaft hole 154a, with the tapered hole portion of the first shaft hole 152a being closer to the ring body 1542 than the straight hole portion thereof.

It is understood that the first shaft hole 152a and the second shaft hole 154a are not limited to the above-mentioned structure, and in other embodiments, the second shaft hole 154a may be a gradually decreasing second shaft hole 154a from a side close to the first bushing 154 to a side far from the first bushing 154; the hole wall of the second shaft hole 154a may be a straight surface inclined with respect to the extending direction of the rotating shaft 121 or an arc surface at the same angle of view as that shown in fig. 13; alternatively, the second shaft hole 154 may have an equal diameter from a side near the first shaft sleeve 154 to a side far from the first shaft sleeve 154. The first shaft aperture 152a may also be similarly configured as the second shaft aperture 154 a. In the same embodiment, the first and

second shaft apertures

152a, 154a may or may not be substantially identical in configuration.

Referring to fig. 14, in particular, the limiting ring 1214 has an outer ring surface 1214a and two end surfaces 1214b connected to the outer ring surface 1214a, and a chamfer 1214c is formed at the connection position of the outer ring surface 1214a and the two end surfaces 1214 b. The chamfers 1214c are arranged at the joints of the outer ring surface 1214a and the two end surfaces 1214b, so that the friction between the limiting ring 1214 and the first shaft sleeve 152 and the second shaft sleeve 154 can be reduced, and the fluid circulation is facilitated.

Referring to fig. 15, in particular, the first shaft sleeve 152 and the second shaft sleeve 154 are both fixedly connected to the driving housing 11. In one embodiment, the first bushing 152 and the second bushing 154 are fixed to the driving housing 11 by adhesive bonding. Specifically, in the illustrated embodiment, one end of the mounting shell 112 close to the shell body 111 is provided with a first glue placing groove 112a communicated with an inner hole of the mounting shell 112, and an adhesive in the first glue placing groove 112a adheres and fixes the mounting shell 112, the first shaft sleeve 152 and one end of the extension part 1544 far away from the ring body 1542. A second glue placing groove 154e is further formed in the outer wall of the second shaft sleeve 154, and the mounting shell 112 and the second shaft sleeve 154 are fixedly bonded by the adhesive in the second glue placing groove 154 e.

Referring to fig. 8 again, further, the magnet assembly 122 further includes a second magnet 1223, and the second magnet 1223 is fixedly connected to the rotating shaft 121; the stator mechanism 13 further includes a power stator 132, the power stator 132 and the driving stator 131 are disposed 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 extending direction of the rotating shaft 121, the power stator 132 is disposed between the impeller 30 and the driving stator 131. The rotating shaft 121 can be rotatably disposed through 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 respectively drive the first magnet 1222 and the second magnet 1223 to rotate, 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, and thus drive the impeller 30 to rotate, so as to provide a greater driving force for the rotation of the impeller 30.

In the illustrated embodiment, the first magnet 1222 and the second magnet 1223 are disposed between the driving stator 131 and the power stator 132. Specifically, the magnet assembly 122 further includes a flywheel 1224 fixedly connected to 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 disposed on the flywheel 1224.

The flywheel 1224 is fixedly disposed on an end of the rotating shaft 121 away from the impeller 30. The flywheel 1224 and the rotating shaft 121 may be integrally formed, or may be fixed to the rotating shaft 121 by bonding, welding, or the like.

The flywheel 1224 is arranged, so that the connection strength between the magnet and the rotating shaft 121 can be increased, and the rotating stability of the rotating shaft 121 is improved; in addition, the first magnet 1222 and the second magnet 1223 are both disposed on the same flywheel 1224, so that the shaking of the rotating shaft 121 during the rotation process can be reduced, and the rotating shaft 121 can be more stable during the rotation process.

Referring to fig. 16 and 17, the flywheel 1224 includes a disk-shaped portion 1224a and a tubular portion 1224b, the tubular portion 1224b is fixedly disposed through a middle portion of the disk-shaped portion 1224a and is coaxial with the disk-shaped portion 1224a, an end of the rotating shaft 121 remote from the impeller 30 is fixedly received in the tubular portion 1224b, and the first magnet 1222 and the second magnet 1223 are respectively disposed on two sides of the disk-shaped portion 1224a facing away from each other, so as to facilitate assembly of the first magnet 1222 and the second magnet 1223, and to better fix the first magnet 1222 and the second magnet 1223 to the rotating shaft 121.

Referring to fig. 18, the first magnet 1222 and the second magnet 1223 are ring-shaped halbach array magnets. The first magnet 1222 includes a plurality of first magnetic blocks 1222a having a magnetizing direction parallel to an axis of the first magnet 1222, the second magnet 1223 includes a plurality of second magnetic blocks 1223a having a magnetizing direction parallel to an axis of the second magnet 1223, and the plurality of second magnetic blocks 1223a and the plurality of first magnetic blocks 1222a are respectively disposed around the rotating shaft 121 at opposite sides of the disk 1224 a. In the extending direction of the rotating shaft 121, each second magnetic block 1223a is disposed opposite to one first magnetic block 1222a, and the polarity of the oppositely disposed second magnetic block 1223a is opposite to the polarity of the side of the first magnetic block 1222a facing the disk-shaped portion 1224 a. The arrangement can facilitate the installation of the first magnet 1222 and the second magnet 1223, and avoid the problem that the magnetic blocks of the first magnet 1222 and the second magnet 1223 repel each other to cause difficulty in assembly.

In some embodiments, the first magnet 1222 further includes a plurality of third magnetic blocks 1222b magnetized along a circumference of the first magnet 1222, the third magnetic blocks 1222b magnetized along the circumference and the first magnetic blocks 1222a magnetized along an axis parallel to the first magnet 1222 are alternately arranged along a circumference where the first magnet 1222 is located. The adjacent first magnetic blocks 1222a have opposite magnetizing directions, for example, one of the adjacent first magnets 1222a is directed from the side of the first magnetic block 1222a facing away from the disk 1224a to the side facing towards the disk 1224a, and the other one is directed from the side of the first magnetic block 1222a facing towards the disk 1224a to the side facing away from the disk 1224 a. The magnetizing directions of the adjacent third magnetic blocks 1222b are opposite on the circumference where the first magnetic block 1222 is located.

Correspondingly, the second magnet 1223 further includes a plurality of fourth magnetic blocks 1223b magnetized along the circumferential direction of the second magnet 1223, and the fourth magnetic blocks 1223b and the second magnetic blocks 1223a are alternately arranged along the circumference where the second magnet 1223 is located. The magnetizing directions of the adjacent second magnetic blocks 1223a are opposite, and the magnetizing directions of the adjacent fourth magnetic blocks 1223b are opposite on the circumference where the second magnetic blocks 1223 are located.

It should be noted that the magnetizing directions of the third magnetic block 1222b and the fourth magnetic block 1223b are not limited to circumferential magnetizing, and in some embodiments, the magnetizing directions of the third magnetic block 1222b and the fourth magnetic block 1223b may also be inclined with respect to the axis of the rotating shaft 121.

In this embodiment, eight magnetic blocks are provided for each of the first magnet 1222 and the second magnet 1223, that is, four of the first magnetic block 1222a, the second magnetic block 1223a, the third magnetic block 1222b, and the fourth magnetic block 1223 b. The first, second, third and fourth

magnetic blocks

1222a, 1223a, 1222b and 1223b are fan-ring magnets, and the first and

second magnets

1222 and 1223 are substantially annular structures. It is understood that in other embodiments, the first magnet 1222 and the second magnet 1223 can also be composed of more or fewer magnetic blocks, such as two, four, six, or ten, etc.

In order to facilitate the mounting of the first and

second magnets

1222 and 1223, the flywheel 1224 is further provided with an identifier 1224c for determining the mounting position of the first and second

magnetic blocks

1222a and 1223 a. The marking 1224c may be provided as a groove, a graduation mark, a logo, or the like. When the first and second

magnetic blocks

1222a and 1223a are mounted, as long as the positions of one of the first and second

magnetic blocks

1222a and 1223a are identified using the identification part 1224c, the mounting positions of the remaining magnetic blocks can be determined, thereby facilitating the mounting of the first and

second magnets

1222 and 1223. Specifically, the logo 1224c may be on at least one of the tubular portion 1224b and the disc portion 1224 a.

In one embodiment, the flywheel 1224 is adhesively secured to the shaft 121. Referring to fig. 15 and 17, a dispensing groove 121a is formed at an end of the rotating shaft 121 far from the impeller 30, and a stop protrusion 1224d abutting against the dispensing groove 121a is disposed on an inner wall of the tubular portion 1224 b. Therefore, the rotation shaft 121 can be conveniently fixed with the stop projection 1224d by disposing glue in the glue dispensing groove 121 a.

Further, the dispensing slot 121a extends along a direction perpendicular to the axis of the rotating shaft 121, and an end of the dispensing slot 121a extends to the outer circumferential surface of the rotating shaft 121. This arrangement allows glue to be disposed in the dispensing groove 121a and to overflow to the outer circumferential surface of the rotating shaft 121 to bond the inner circumferential wall of the tubular portion 1224b and the circumferential surface of the rotating shaft 121, so that the rotating shaft 121 and the flywheel 1224 can be better fixed, or, it is also convenient for excess glue between the rotating shaft 121 and the tubular portion 1224b to overflow into the dispensing groove 121 a.

In this embodiment, the flywheel 1224 further includes an outer annular wall 1224e disposed around the disk 1224a, the outer annular wall 1224e, the tubular portion 1224b and the disk 1224a collectively enclose a first accommodating portion and a second accommodating portion that accommodate the first magnet 1222 and the second magnet 1223, respectively, and the first accommodating portion and the second accommodating portion are partitioned by the disk 1224 a. This arrangement can position the first and

second magnets

1222, 1223, not only to facilitate the installation of the first and

second magnets

1222, 1223, but also to make the combination of the first and

second magnets

1222, 1223 and the flywheel 1224 more stable.

In this embodiment, in the axial direction of the tubular portion 1224b, the side of the first magnet 1222 facing away from the disk portion 1224a is higher than the outer ring wall 1224e, and the side of the second magnet 1223 facing away from the disk portion 1224a is higher than the outer ring wall 1224e, so as to facilitate the first magnet 1222 and the second magnet 1223 to be mounted on the flywheel 1224.

It is noted that the flywheel 1224 is not limited to the above-described structure, and in some embodiments, the flywheel 1224 does not have the outer ring wall 1224 e; in some embodiments, the flywheel 1224 does not have the outer annular wall 1224e and the tubular portion 1224b, and the rotating shaft 121 is fixedly disposed through the disk portion 1224a, for example, the center of the disk portion 1224 a. The provision of the tubular portion 1224b enables the flywheel 1224 to be more stably connected to the rotary shaft 121 than the flywheel 1224 having only the disk-shaped portion 1224 a.

Referring to fig. 8, the structure of the power stator 132 is similar to that of the driving stator 131. The power stator 132 includes 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 disposed around the rotating shaft 121 at intervals, and an extending direction of each second magnetic core 1322 is parallel to an axis of the rotating shaft 121. One end of each second magnetic core 1322 is fixedly connected to the second back plate 1321, and the other end extends to be close to the second magnet 1223. In other words, the driving stator 131 and the power stator 132 are oppositely disposed in 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 is capable of generating a rotating magnetic field that interacts with the second magnet 1223.

First core 1312 and second core 1322 include magnetic pillars, first coil 1313 is wound around magnetic pillar of first core 1312, and second coil 1323 is wound around magnetic pillar of second core 1322. The cross-sectional area of the magnetic pillar of first magnetic core 1312 is larger than the cross-sectional area of the magnetic pillar of second magnetic core 1322. I.e., the magnetic pillar of first core 1312 is thicker than the magnetic pillar of second core 1322.

The larger the cross-sectional area of the magnetic column is, the larger the generated magnetic flux is, the larger the torque of the stator to the magnet is, and the smaller the required current is, so that the power consumption is reduced, and the heat generation is reduced. Since the rotating shaft 121 passes through the middle of the power stator 132, the cross-sectional area of the second magnetic core 1322 is limited due to the radial size of the blood pump 100, and the rotating shaft 121 does not pass through the middle of the driving stator 131, so that the first magnetic core 1312 can select a larger cross-sectional area, in other words, the power consumption can be reduced, and the heat generated by the driving device 10 can be reduced.

In the present embodiment, each of the first magnetic core 1312 and the second magnetic core 1322 has only a magnetic pillar, that is, each of the first magnetic core 1312 and the second magnetic core 1322 has no head portion (i.e., pole shoe) with a large width, and the width of each of the first magnetic core 1312 and the second magnetic core 1322 is constant in the length direction of the first magnetic core 1312 and the second magnetic core 1322, and the entire first magnetic core 1312 and the entire second magnetic core 1322 can be magnetically coupled with the first magnet 1222 and the second magnet 1223, so that compared with the magnetic core provided with the pole shoe, the present application can reduce magnetic loss and increase the magnetic coupling density between the first magnetic core 1312 and the first magnet 1222 and between the second magnetic core 1322 and the second magnet 1223, so as to increase the torque of the driving stator 131 to the first magnet 1222 and the torque of the power stator 132 to the second magnet 1223 (under the equal current condition). In addition, the first core 1312 and the second core 1322 without heads can also greatly reduce the problem of power reduction of the motor due to local magnetic short circuit caused by contact between adjacent cores.

The cross-sectional shape of the first core 1312 and the second core 1322 having only magnetic pillars may be a sector, a circle, a trapezoid, a sector ring, or the like. As shown in fig. 19, in the illustrated embodiment, the first core 1312 and the second core 1322 having only magnetic pillars are substantially triangular prism-shaped, and one edge of each core faces the axis of the rotating shaft 121. In this embodiment, the edges of first core 1312 and second core 1322 are rounded, so that the subsequent winding of the coil can be facilitated by rounding the edges, and the protection of the insulating material coated on the coil is facilitated.

It is appreciated that in other embodiments, the first core 1312 and the second core 1322 may further include a head disposed at one end of the magnetic pillar, the first back plate 1311 engaging an end of the magnetic pillar of the first core 1312 remote from the head; the second back plate 1321 is coupled to an end of the magnetic pillar of the second magnetic core 1322 away from the head. Alternatively, in some embodiments, it is also possible for one of first core 1312 and second core 1322 to have both a magnetic post and a head, and the other to have only a magnetic post.

Referring to fig. 14 again, in order to make the second magnetic core 1322 of the power stator 132 as thick as possible, the rotating shaft 121 penetrating through the power stator 132 needs to be thin, but considering that the rotating shaft 121 needs to be matched with the shaft sleeve assembly 15, the rotating shaft 121 needs to have larger rigidity and wear resistance, for this reason, the shaft body 1212 of the rotating shaft 121 has a first matching section 1212a and a second matching section 1212b, in the extending direction perpendicular to the shaft body 1212, the cross-sectional area of the first matching section 1212a is larger than that of the second matching section 1212b, that is, the first matching section 1212a is thicker than the second matching section 1212b, the first matching section 1212a penetrates through the shaft sleeve assembly 15, and the second matching section 1212b penetrates through the power stator 132. The retainer ring 1214 is fixedly disposed on the first mating segment 1212 a.

In order to avoid contamination of the cleaning fluid and/or corrosion of the components within the drive unit 10, the drive stator 131 and the power stator 132 of the drive unit 10 are each coated with a water-tight sealing film. Wherein, the waterproof sealing film can be made of silica gel, glue and the like.

The above-described drive device 10 has at least the following advantages:

(1) the above-described driving apparatus 10 is configured such that the first bushing 152 and the second bushing 154 for supporting the rotor 12 are disposed along the rotational axis of the rotor 12, and one of the first bushing 152 and the second bushing 154 abuts against the stopper 11b of the driving housing 11 to support one of the first bushing 152 and the second bushing 154, and the ring body 1542 of the second bushing 154 for supporting the rotor 12 abuts against the first bushing 152 through the extension 1544 of the second bearing 154 to support the spacer ring body 1542 and the first bushing 152 to better support the rotor 12; the extension part 1544 and the ring body 1542 are integrated, so that the assembly of parts can be reduced, and the assembly of the driving device 10 can be simplified; the communication port 11a is further provided to allow the first sleeve 152 and the second sleeve 154 to pass through, so that the first sleeve 152 and the second sleeve 154 can be fitted into the mounting case 112 of the drive case 11 from the communication port 11a, to make the assembly of the drive device 10 more convenient; and the above structural design makes the driving device 10 not only simple and convenient to assemble, but also can improve the assembly precision of the driving device 10 and improve the production efficiency.

(2) By arranging the limiting ring 1214 on the rotating shaft 121, the outer diameter of the limiting ring 1214 is respectively greater than the inner diameter of the ring body 1542 and the inner diameter of the first shaft sleeve 152, so as to limit the rotating shaft 121 in the extending direction of the shaft body 1212, and prevent the rotating shaft 121 from moving greatly relative to the driving shell 11 in the extending direction of the rotating shaft 121; by providing the first guide groove 152b and/or the second guide groove 154b, fluid circulation can be facilitated, and the influence of the limiting ring 1214 on fluid circulation when abutting against the first sleeve 152 or the ring body 1542 can be reduced.

(3) The aperture of the side of the first sleeve 152 close to the ring body 1542 is set to be larger than the aperture of the side of the first sleeve 152 away from the ring body 1542, and the aperture of the side of the ring body 1542 close to the first sleeve 152 is larger than the aperture of the side of the ring body 1542 away from the first sleeve 152, so that the first sleeve 152 and the part of the ring body 1542 supporting the rotating shaft 121 are separated as far as possible, thereby reducing the shaking amplitude of the rotating shaft 121 as much as possible, reducing the contact area between the sleeve assembly 15 and the rotating shaft 121, reducing friction, and facilitating the flow of fluid (e.g., cleaning fluid).

(4) The length of the straight hole portion 154c of the second shaft hole 154a in the extending direction of the rotation shaft 121 is greater than or equal to 0.5 mm to better achieve the support of the rotation shaft 121.

(5) The driving stator 131 and the rotating shaft 121 are arranged at intervals along the axis of the rotating shaft 121, so that the cross section of the driving stator 131 along the direction perpendicular to the axial direction of the rotating shaft 121 is larger, the magnetic flux of a rotating magnetic field generated by the driving stator 131 is larger, and the torque to the first magnet 1222 is also larger, thereby reducing the current required by the driving stator 131 when the rotating shaft 121 is driven to rotate, and ensuring that the blood pump 100 has lower power consumption and less heat generation; by further providing the power stator 132, the driving stator 131 and the power stator 132 can jointly drive the rotating shaft 121 to rotate around the axis of the rotating shaft 121, so as to drive the impeller 30 to rotate, thereby providing a greater driving force for the rotation of the impeller 30.

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

It will be appreciated that the rotor 12 may not have a flywheel at this time; alternatively, there is one flywheel for mounting one of the first magnet 1222 and the second magnet 1223.

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, the other flywheel is located between the power stator 132 and the driving stator 131, the first magnet 1222 is fixed on the flywheels between the power stator 132 and the driving stator 131, the second magnet 1223 is fixed on the flywheels between the impeller 30 and the power stator 132, i.e., the first magnet 1222 is located between the power stator 132 and the driving stator 131, and the second magnet 1223 is located between the impeller 30 and the power stator 132. It will be appreciated that the rotor 12 may not have a flywheel at this time.

Alternatively, in some embodiments, the rotating shaft 121 may also be disposed to penetrate through the driving stator 131, and the rotating shaft 121 penetrates through the driving stator 131 and the power stator 132, in this case, the entire magnetic assembly 122 may be disposed between the driving stator 131 and the power stator 132; alternatively, the power stator 132 is located between the first magnet 1222 and the second magnet 1223, or the driving stator 131 and the power stator 132 are both located between the first magnet 1222 and the second magnet 1223. It will be appreciated that the rotor 12 may not have a flywheel at this time.

Alternatively, in some embodiments, the drive device 10 has only one of the power stator 132 and the drive stator 131.

The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.

Claims

1. A drive device capable of driving an impeller of a blood pump to rotate, comprising:

the driving shell is provided with a communication port and a limiting part;

the shaft sleeve assembly comprises a first shaft sleeve and a second shaft sleeve which are installed on the driving shell, the first shaft sleeve and the second shaft sleeve are arranged along the rotation axis of the rotor, one of the first shaft sleeve and the second shaft sleeve is abutted to the limiting portion, the second shaft sleeve comprises a ring body and an extending portion extending out of the ring body, the extending portion is abutted to the first shaft sleeve, so that the ring body is spaced from the first shaft sleeve, the rotor can rotatably penetrate through the first shaft sleeve and the ring body, and the communicating port can allow the first shaft sleeve and the second shaft sleeve to penetrate through.

2. The drive device according to claim 1, wherein the rotor includes:

the rotating shaft comprises a shaft body and a limiting ring annularly arranged on the shaft body, the shaft body can rotatably penetrate through the first shaft sleeve and the ring body, one end of the shaft body is accommodated in the driving shell, the other end of the shaft body extends out of the driving shell from the communication port and is fixedly connected with the impeller, the limiting ring is positioned between the ring body and the first shaft sleeve, the limiting ring is positioned between the shaft body and the extension part, and the outer diameter of the limiting ring is respectively larger than the inner diameter of the ring body and the inner diameter of the first shaft sleeve so as to limit the rotating shaft in the extension direction of the shaft body;

3. The drive of claim 2, wherein the extension is annular, the extension is coaxial with the ring body, an inner diameter of the extension is greater than an outer diameter of the stop collar, and a gap is formed between the extension and the stop collar for fluid communication.

4. The driving device as claimed in claim 2, wherein the first shaft sleeve has a first shaft hole, a first guiding groove is further formed on a side of the first shaft sleeve facing the limiting ring, the first guiding groove is communicated with the first shaft hole, the shaft body is rotatably inserted into the first shaft hole, and a gap for fluid to flow through is formed between the shaft body and the first shaft hole;

and/or the ring body is provided with a second shaft hole, a second diversion trench is further formed in one side, facing the limiting ring, of the ring body, the second diversion trench is communicated with the second shaft hole, the shaft body can penetrate through the second shaft hole in a rotating mode, and a gap for fluid circulation is formed between the shaft body and the second shaft hole.

5. The drive device as claimed in claim 2, wherein said retainer ring has an outer circumferential surface and two end surfaces connected to said outer circumferential surface, and a chamfer is provided at a junction between said outer circumferential surface and said two end surfaces.

6. The drive of claim 1, wherein the first sleeve defines a positioning slot, and an end of the extension portion distal from the ring body is received in the positioning slot to position the second sleeve.

7. The drive device according to claim 1, wherein the first boss includes a disk portion and a boss portion formed on a surface of the disk portion, the first boss having a first shaft hole extending from the surface of the disk portion remote from the boss portion to an end surface of the boss portion remote from an end of the disk portion; the extension part is annular, the extension part is coaxial with the ring body, the extension part is sleeved on the circular table part, the end face of one end, far away from the ring body, of the extension part is abutted against the disc part, and the rotor can rotatably penetrate through the first shaft hole.

8. The drive of claim 1, wherein a side of the first bushing proximate the ring body has a larger bore than a side of the first bushing facing away from the ring body; and/or the aperture of one side of the ring body close to the second shaft sleeve is larger than that of one side of the ring body away from the ring body.

9. The drive device according to claim 1, wherein the second bushing has a second shaft hole having a straight hole portion and a tapered hole portion communicating with the straight hole portion, an end of the tapered hole portion having a smaller hole diameter communicates with the straight hole portion, an end of the tapered hole portion having a larger hole diameter faces the first bushing, and the rotor is rotatably inserted through the straight hole portion and the tapered hole portion.

10. The drive device according to claim 9, wherein a length of the straight hole portion in a rotational axis direction of the rotor is greater than or equal to 0.5 mm.

11. The driving device as claimed in claim 1, wherein the driving housing includes a housing body and a mounting housing abutting against the housing body, the first bushing and the second bushing are mounted on the mounting housing, the stator mechanism is accommodated in the housing body, and the communication port and the limiting portion are both provided in the mounting housing.

12. The driving device according to claim 1, wherein the rotor includes 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 and is fixedly connected to the impeller, the rotating shaft is rotatable relative to the driving shell, the magnetic assembly includes a first magnet and a second magnet, and both the first magnet and the second magnet are fixedly connected to the rotating shaft;

13. The driving apparatus as claimed in claim 12, wherein the driving stator includes a plurality of first magnetic cores and a plurality of first coils respectively wound around the plurality of first magnetic cores, the plurality of first magnetic cores being arranged around a line on which the rotation axis of the rotating shaft is located; the power stator includes a plurality of second magnetic cores and twines a plurality ofly respectively a plurality of second coils that the second magnetic core set up, it is a plurality of the second magnetic core encircles the pivot sets up a week, wherein, first magnetic core with the second magnetic core all includes the column magnet, first magnetic core the cross-sectional area of column magnet is greater than the second magnetic core the cross-sectional area of column magnet.

14. The drive device of claim 12, wherein the rotating shaft has a first engaging section and a second engaging section, the first engaging section has a larger cross-sectional area than the second engaging section, the first engaging section is rotatably disposed through the sleeve assembly, and the second engaging section is rotatably disposed through the power stator.

15. A blood pump, comprising:

a drive arrangement according to any one of claims 1 to 14;