WO2023160424A1 - Blood pump and driver apparatus thereof - Google Patents

Abstract

Provided are a driver apparatus (10) and a blood pump (100). The driver apparatus (10) comprises a driver housing (11), a rotor (12), a stator mechanism (13), and a shaft sleeve assembly (15). The driving housing (11) is provided with a communication port (11a) and a limiting part (11b). The shaft sleeve assembly (15) comprises a first shaft sleeve (152) and a second shaft sleeve (154) that are mounted on the driver housing (11). One of the first shaft sleeve (152) and the second shaft sleeve (154) abuts against the limiting part (11b). The second shaft sleeve (154) comprises a ring body (1542) and an extension part (1544). The extension part (1544) abuts against the first shaft sleeve (152). The rotor (12) is rotatably arranged through the first shaft sleeve (152) and the ring body (1542). The communication port (11a) allows the first shaft sleeve (152) and the second shaft sleeve (154) to pass through.

Description

Blood pump and its driving device

This application claims priority to a Chinese patent application with application number 202210169758.2 filed at the China Patent Office on February 23, 2022, the entire contents of which are incorporated herein by reference.

technical field

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

Background technique

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

The current intravascular blood pump mainly includes an impeller and a motor that drives the impeller to rotate. When the motor works, a rotating magnetic field is generated. The impeller is provided with a magnet that interacts with the rotating magnetic field, so that the impeller rotates around its axis, and the blood is drawn from the blood pump. The blood inflow port is delivered to the blood outflow port. However, due to the small volume of the intravascular blood pump, it is difficult to assemble.

Contents of the invention

Based on this, the present application provides a blood pump and its driving device, which can make the assembly process of the blood pump simpler and more convenient.

The embodiment of the first aspect of the present application provides a driving device, including:

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

The rotor is rotatably mounted on the drive case, part of the rotor is accommodated in the drive case, and part of the rotor extends outside the drive case;

a stator mechanism housed in the drive housing, the stator mechanism can generate a rotating magnetic field that drives the rotor to rotate; and

A shaft sleeve assembly, including a first shaft sleeve and a second shaft sleeve mounted on the drive housing, the first shaft sleeve and the second shaft sleeve are arranged along the rotation axis of the rotor, and the first shaft sleeve One of the second sleeves abuts against the limiting portion, the second sleeve includes a ring body and an extension extending from the ring body, the extension is in contact with the first The bushing abuts so that the ring body is spaced from the first bushing, wherein the rotor is rotatably passed through the first bushing and the ring body, and the communication port can be used for the The first sleeve and the second sleeve pass through.

The embodiment of the second aspect of the present application provides a blood pump, including:

The driving device as described in the first aspect;

The impeller is arranged outside the drive housing, the impeller is fixedly connected to the rotor, and can rotate with the rotor.

The details of one or more embodiments of the invention are set forth in the accompanying drawings and the description below. Other features, objects and advantages of the invention will be apparent from the description, drawings and claims.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the accompanying drawings that need to be used in the descriptions of the embodiments or the prior art will be briefly introduced below. Obviously, the accompanying drawings in the following description are only for the present application For some embodiments, those of ordinary skill in the art can also obtain other drawings based on these drawings without paying creative efforts.

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

Fig. 2 is a structural schematic diagram of the blood pump shown in Fig. 1 omitting part of the cannula assembly and the pigtail;

Fig. 3 is a sectional view of the blood pump shown in Fig. 2 along A-A;

Fig. 4 is a schematic structural diagram of the driving device of the blood pump shown in Fig. 1;

Fig. 5 is a structural schematic diagram of another angle of the driving device shown in Fig. 4;

Fig. 6 is a sectional view of the driving device shown in Fig. 5 along the line B-B;

Fig. 7 is a structural schematic diagram of another angle of the driving device shown in Fig. 4;

Fig. 8 is a cross-sectional view of the driving device shown in Fig. 7 along line C-C;

Fig. 9 is an exploded view of the driving device shown in Fig. 4;

Fig. 10 is a cross-sectional view of the rotating shaft of the driving device shown in Fig. 6, the shaft sleeve assembly and the mounting shell of the drive shell;

Fig. 11 is a structural schematic diagram of another angle of the first bushing of the bushing assembly of the driving device shown in Fig. 9;

Fig. 12 is a structural schematic diagram of another angle of the second bushing of the bushing assembly of the driving device shown in Fig. 9;

Fig. 13 is a cross-sectional view of the shaft sleeve assembly of the driving device shown in Fig. 10;

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

Fig. 15 is a cross-sectional view of the rotating shaft of the driving device shown in Fig. 8, the shaft sleeve assembly and the mounting shell of the drive shell;

Fig. 16 is a structural schematic diagram of another angle of the magnetic assembly of the rotor of the driving device shown in Fig. 9;

Fig. 17 is a cross-sectional view of the magnetic assembly shown in Fig. 16 along line D-D;

Figure 18 is an exploded view of the magnetic assembly shown in Figure 16;

FIG. 19 is a structural schematic diagram of another angle of the driving stator of the driving device shown in FIG. 9 .

Detailed ways

In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings, that is, embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, not to limit the present application.

It should be noted that when an element is referred to as being “fixed” or “disposed on” another element, it may 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 indirectly connected to the other element.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present application, "plurality" means two or more, unless otherwise specifically defined.

In order to illustrate the technical solution of the present application, the following will be described in conjunction with specific drawings and embodiments.

Referring to FIGS. 1 to 3 , the first embodiment of the present application provides a blood pump 100 , including a driving device 10 , a sleeve assembly 20 and an impeller 30 . The cannula assembly 20 is connected to the driving device 10 ; the impeller 30 is rotatably accommodated in the cannula assembly 20 ;

Specifically, the sleeve 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 the aortic valve, while the inflow port 21 is located inside the heart, and the outflow port 22 and drive device 10 are located outside the heart in a vessel, such as the aorta. When the impeller 30 rotates, blood flows into the cannula assembly 20 from the inflow port 21 and flows out of the cannula assembly 20 from the outflow port 22 .

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

Specifically, the pigtail pipe 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.

Further, the blood pump 100 further includes a catheter assembly 40 , which is connected to the driving device 10 , and a supply line is arranged inside the catheter assembly 40 , and the supply line includes a cleaning line 411 for feeding cleaning fluid into the driving device 10 . Specifically in the illustrated embodiment, the drive device 10 is located 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.

Please refer to FIGS. 3 to 9 together. 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 includes a driving housing 11 , a rotor 12 , a stator mechanism 13 , a fixing member 14 and a bushing assembly 15 .

The drive case 11 has a communication port 11a. The communication port 11 a is located on a side of the drive housing 11 close to the bushing assembly 20 . Specifically, the communication port 11 a communicates with the drive housing 11 and the bushing assembly 20 . The impeller 30 is provided outside the drive housing 11 . Wherein, the cleaning fluid passed through the cleaning pipeline 411 can flow through the interior of the driving case 11 and flow into the cannula assembly 20 from the communication port 11a to prevent blood from penetrating into the driving case 11 from the communication port 11a of the driving case 11 .

Please also refer to FIG. 10 , the drive housing 11 is further provided with a limiting portion 11 b. In this embodiment, the drive housing 11 includes a housing body 111 and an installation housing 112 docked with the housing body 111 , and the communication port 11 a and the limiting portion 11 b are both disposed on the installation housing 112 . Specifically, both the shell body 111 and the installation shell 112 are substantially cylindrical. The limiting portion 11 b is an annular protrusion disposed on the inner wall of the installation shell 112 . An open end of the installation shell 112 is docked with an open end of the shell body 111 , and the communication port 11 a is an opening of an end of the installation shell 112 away from the shell body 111 . Wherein, the limiting portion 11 b is located at an end of the installation shell 112 away from the communication opening 11 a, that is, an end of the installation shell 112 close to the shell body 111 .

The rotor 12 is rotatably mounted on the drive housing 11 , part of the rotor 12 is housed in the drive case 11 , partly extends out of the drive case 11 , and is fixedly connected to the impeller 30 , the rotor 12 can drive the impeller 30 to rotate.

Please refer to FIG. 3, FIG. 6, FIG. 8 and FIG. 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 housing 11, and the other end extends from the communication port 11a to the outside of the driving housing 11. And it is fixedly connected with the impeller 30 , the rotating shaft 121 can rotate relative to the driving shell 11 , and the magnetic assembly 122 is fixedly connected with the rotating shaft 121 . Specifically, the rotating shaft 121 is passed through the installation shell 112 , one end is accommodated in the shell body 111 , and the other end extends from the communication port 11 a to the outside of the drive shell 11 to be fixedly connected to the impeller 30 . The magnetic assembly 122 is located in the housing body 111 of the driving housing 11 .

Specifically, the rotating shaft 121 is made of materials such as ceramics or stainless steel, such as aluminum oxide toughened zirconia (ATZ) or SUS316L, so as to prevent the rotating shaft 121 from breaking.

The stator mechanism 13 is accommodated in the drive housing 11 , and the stator mechanism 13 can generate a rotating magnetic field that drives the rotor 12 to rotate. Specifically, the stator mechanism 13 can generate a rotating magnetic field that drives the magnetic assembly 122 to rotate, so that the magnetic assembly 122 can drive the rotating shaft 121 to rotate around the axis of the rotating shaft 121 . Specifically, the stator mechanism 13 is accommodated in the housing body 111 of the driving housing 11 .

In one embodiment, the magnet assembly 122 includes a first magnet 1222 , and the first magnet 1222 is fixedly connected to the rotating shaft 121 . The stator mechanism 13 includes a driving stator 131 , and 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 . The driving stator 131 can generate a rotating magnetic field interacting 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 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 perpendicular to the axial direction of the rotating shaft 121 is larger, and the driving stator 131 generates The magnetic flux of the rotating magnetic field is larger, and the torque to the first magnet 1222 is also larger, thereby reducing the current required to drive the stator 131 to rotate the rotating shaft 121, which can ensure that the blood pump 100 consumes less power and generates less heat. .

Specifically, the driving stator 131 includes a first back plate 1311 , a plurality of first magnetic cores 1312 and a plurality of first coils 1313 respectively arranged around the first magnetic cores 1312 . The first backboard 1311 is fixed in the driving shell 11 . The plurality of first magnetic cores 1312 are arranged at intervals around the axis of the rotating shaft 121 for one circle. 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 affixed to the first backplane 1311 , and the other end extends close to the first magnet 1222 . The first coil 1313 can generate a rotating magnetic field interacting 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 rotates with the rotating shaft 121 .

It should be noted that, in some embodiments, the driving stator 131 may not have the first back plate 1311 . The first back plate 1311 acts as a closed magnetic circuit to promote and increase the generation of magnetic flux of the driving stator 131 and improve the coupling capability. Since the first back plate 1311 can increase the magnetic flux, the setting of the first back plate 1311 is beneficial to reduce the overall diameter of the blood pump 100 . The first backplane 1311 and the first magnetic core 1312 are made of the same material. In some embodiments, both the first backplane 1311 and the first magnetic core 1312 are made of soft magnetic materials, such as cobalt steel.

The fixing part 14 is fixed in the driving shell 11, and the fixing part 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 penetrated in the positioning hole 1311a, so as to facilitate the driving of the stator 131. Positioning installation. Wherein, the axis of the positioning post 141 coincides with the axis of the rotating shaft 121 .

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

Further, a support hole 143 is provided on the fixing member 14, and a support member (not shown) is also provided in the catheter assembly 40, and the support member is used to support the catheter assembly 40 and/or the blood pump 100 when the blood pump 100 is delivered. As a result, one end of the support member can be accommodated in the support hole 143 . Specifically, the supporting member is, for example, a nickel-titanium wire.

Please refer to FIG. 10 again, the sleeve assembly 15 includes a first sleeve 152 and a second sleeve 154 mounted on the drive housing 11, the first sleeve 152 and the second sleeve 154 are arranged along the rotation axis of the rotor 12, the first One of the shaft sleeve 152 and the second shaft sleeve 154 abuts against the limiting portion 11 b, and the rotor 12 is rotatably passed through the first shaft sleeve 152 and the second shaft sleeve 154 . Wherein, the communication port 11 a can allow the first shaft sleeve 152 and the second shaft sleeve 154 to pass through. The communication port 11a is set so that the first shaft sleeve 152 and the second shaft sleeve 154 can pass through, so that the first shaft sleeve 152 and the second shaft sleeve 154 can be loaded into the installation shell 112 of the drive housing 11 from the communication port 11a , which can facilitate the assembly of the driving device 10 and improve the assembly accuracy and improve the production efficiency. Specifically in the illustrated embodiment, both the first shaft sleeve 152 and the second shaft sleeve 154 are installed in the installation shell 112; the second shaft sleeve 154 is closer to the communication port 11a than the first shaft sleeve 152; the first shaft sleeve 152 Abut against the limiting portion 11b; the rotating shaft 121 is rotatably passed through the first sleeve 152 and the second sleeve 154 .

The first shaft sleeve 152 and the rotating shaft 121 together form a bearing structure. The first shaft sleeve 152 has a first shaft hole 152a, the rotor 12 (specifically, the rotating shaft 121) is rotatably penetrated through the first shaft hole 152a, and there is a supply fluid (such as Cleaning fluid) flow gap.

Please also refer to FIG. 11 , specifically, the first bushing 152 includes a disc portion 1522 and a circular truncated portion 1524 formed on a surface of the disc portion 1522 , and the first shaft hole 152 a extends from the surface of the disc portion 1522 away from the circular truncated portion 1524 To the end surface of the end of the circular truncated portion 1524 away from the disk portion 1522 . Wherein, the side of the disc portion 1522 away from the circular truncated portion 1524 abuts against the limiting portion 11b.

Please refer to FIG. 10 , FIG. 12 and FIG. 13 together, the second sleeve 154 and the rotating shaft 121 together constitute a bearing structure. Wherein, the second sleeve 154 includes a ring body 1542 and an extension portion 1544 extending from the ring body 1542 , that is, the ring body 1542 and the extension portion 1544 are formed into one piece. The assembly of the driving device 10 can be simplified by forming the ring body 1542 and the extension part 1544 into one piece, and the rotating shaft 121 can be more stable in rotation. Wherein, the extension part 1544 abuts against the first shaft sleeve 152, so that the ring body 1542 is spaced from the first shaft sleeve 152, thereby positioning the relative positions of the first shaft sleeve 152 and the ring body 1542, wherein the rotor 12 can rotate The ground passes through the ring body 1542 . Specifically, the ring body 1542 has a second shaft hole 154a, and the rotating shaft 121 is rotatably passed through the second shaft hole 154a, and there is a hole for fluid (such as cleaning fluid) to flow between the hole wall of the second shaft hole 154a and the rotating shaft 121. gap.

Specifically, in the illustrated embodiment, the extension part 1544 is annular, and the extension part 1544 is coaxial with the ring body 1542. The extension part 1544 is sleeved on the circular platform part 1524. portion 1522 abuts. Wherein, the outer diameter of the circular truncated portion 1524 is adapted to the inner diameter of the extension portion 1544 .

Please refer to FIG. 9 and FIG. 10 again, further, the rotating shaft 121 includes a shaft body 1212 and a limiting ring 1214 surrounding the shaft body 1212, the shaft body 1212 is rotatably passed through the first shaft sleeve 152 and the ring body 1542, One end of the shaft body 1212 is accommodated in the drive housing 11, and the other end extends from the communication port 11a to the outside of the drive housing 11 and is fixedly connected to the impeller 30; the limit ring 1214 is located between the ring body 1542 and the first shaft sleeve 152, and limits The spacer ring 1214 is located between the shaft body 1212 and the extension part 1544, and the outer diameter of the spacer ring 1214 is respectively larger than the inner diameter of the ring body 1542 and the inner diameter of the first sleeve 152, so as to limit the rotation of the shaft 121 in the extending direction of the shaft body 1212. position, so as to prevent the rotating shaft 121 from greatly moving relative to the driving shell 11 in the extending direction of the rotating shaft 121 .

Wherein, the inner diameter of the extension portion 1544 is larger than the outer diameter of the limiting ring 1214 , and a gap for fluid communication is formed between the extending portion 1544 and the limiting ring 1214 . The cleaning fluid that passes through the cleaning pipeline 411 into the interior of the drive housing 11 flows through the gap between the first shaft hole 152a and the rotating shaft 121, the gap between the limit ring 121a and the extension part 1544, and the hole in the second shaft hole 154a. The gap between the wall and the rotating shaft 121, and entering the bushing assembly 20 from the communication port 11a can not only play the role of backwashing, but also play the role of between the rotating shaft 121 and the first sleeve 152, between the rotating shaft 121 and the second Lubrication between the bushings 154.

Please refer to FIG. 11 to FIG. 13 again, specifically, a first diversion groove 152b is opened on the side of the first bushing 152 facing the limit ring 1214, and the first diversion groove 152b communicates with the first shaft hole 152a. . Since the first guide groove 152b is arranged on the side of the first sleeve 152 facing the limit ring 1214, the first guide groove 152b is also connected to the gap between the extension part 1544 and the limit ring 1214. The groove 152b can facilitate fluid flow, lowering the limit ring 1214 and the first shaft sleeve 152 Effect on fluid flow during abutment. Specifically, the first guide groove 152b is opened on a side of the circular truncated portion 1524 away from the disk portion 1522 .

Specifically, a second guide groove 154b is defined on the side of the ring body 1542 of the second sleeve 154 facing the limiting ring 1214 , and the second guide groove 154b communicates with the second shaft hole 154a. Since the second flow guide groove 154b is provided on the side of the ring body 1542 facing the stop ring 1214, the second flow guide groove 154b is also connected to the gap between the extension part 1544 and the stop ring 1214, and the second flow guide groove 154b can It is beneficial for the fluid to flow through the gap between the extension part 1544 and the limiting ring 1214 and between the second shaft hole 154a, and reduces the impact on fluid circulation when the limiting ring 1214 abuts against the ring body 1542 .

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

It can be understood that the extension part 1544 is not limited to be ring-shaped. In one embodiment, the extension part 1544 is a rod-shaped structure, and there are a plurality of extension parts 1544, and the plurality of extension parts 1544 are arranged around the rotation axis of the rotor. A positioning slot is also defined, and an end of the extension portion 1544 away from the ring body 1542 is accommodated in the positioning slot to position the second sleeve 154 .

Specifically, the diameter of the first shaft sleeve 152 near the ring body 1542 is larger than the diameter of the first shaft sleeve 152 away from the ring body 1542 . Such arrangement can not only reduce the contact area between the first sleeve 152 and the rotating shaft 121 , reduce friction, but also facilitate the flow of fluid and reduce the swaying amplitude of the rotating shaft 121 .

Specifically, the diameter of the hole on the side of the ring body 1542 close to the first sleeve 152 is greater than the diameter of the hole on the side of the ring body 1542 facing away from the first sleeve 152 . Such arrangement can not only reduce the contact area between the ring body 1542 and the rotating shaft 121, reduce friction, but also facilitate the flow of fluid, reduce the shaking amplitude of the rotating shaft 121 and prevent the blood in the cannula assembly 20 from passing through the second shaft. The hole 154a enters the drive housing 11 .

In one embodiment, the gap between the end of the ring body 1542 away from the first sleeve 152 and the rotating shaft 121 is less than or equal to 2 μm. Since it is difficult for the smallest red blood cells (about 8 μm in diameter and about 2 μm in thickness) to enter the gap with a width less than or equal to 2 μm, and the backflush cleaning fluid passes through this gap, preventing the blood from entering the drive housing 11 through the second shaft hole 154a internal.

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

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

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

It can be understood that the first shaft hole 152a and the second shaft hole 154a are not limited to the above structure. In other embodiments, the second shaft hole 154a can also be from the side close to the first shaft sleeve 152 to the On one side of the sleeve 152, the diameter of the second shaft hole 154a gradually decreases; at the same viewing angle as that shown in FIG. , or arc-shaped; or, from the side close to the first shaft sleeve 152 to the side away from the first shaft sleeve 152, the diameters of the second shaft holes 154a are equal. The first shaft hole 152a may also have a similar structure to the second shaft hole 154a. In the same embodiment, the configurations of the first shaft hole 152a and the second shaft hole 154a may be basically the same or different.

Please refer to FIG. 14 , specifically, the limiting ring 1214 has an outer annular surface 1214a and two end surfaces 1214b connected to the outer annular surface 1214a, and chamfers 1214c are provided at the junctions between the outer annular surface 1214a and the two end surfaces 1214b. Chamfers 1214c are provided at the joints of the outer ring surface 1214a and the surfaces of both ends 1214b, which can not only reduce the friction between the limiting ring 1214 and the first bushing 152 and the second bushing 154, but also facilitate fluid flow. circulation.

Please refer to FIG. 15 , specifically, both the first shaft sleeve 152 and the second shaft sleeve 154 are fixedly connected with the driving shell 11 . In one embodiment, both the first shaft sleeve 152 and the second shaft sleeve 154 are bonded and fixed to the drive housing 11 by adhesive. Specifically, in the illustrated embodiment, one end of the installation shell 112 close to the shell body 111 is provided with a hole communicating with the inner hole of the installation shell 112. The adhesive in the first glue groove 112a glues and fixes the installation shell 112 , the first shaft sleeve 152 and the end of the extension portion 1544 away from the ring body 1542 . The outer wall of the second shaft sleeve 154 is also provided with a second glue groove 154e, and the adhesive in the second glue groove 154e fixes and bonds the installation shell 112 and the second shaft sleeve 154 .

Please refer to FIG. 8 again, further, the magnetic assembly 122 also includes a second magnet 1223, and the second magnet 1223 is fixedly connected to the rotating shaft 121; and the power stator 132 is closer to the impeller 30 than the drive stator 131 , that is, the power stator 132 is arranged between the impeller 30 and the drive stator 131 in the extending direction of the rotating shaft 121 . Wherein, the rotating shaft 121 is rotatably passed 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, thereby driving the impeller 30 to rotate, so as to give The rotation of the impeller 30 provides greater driving force.

In the illustrated embodiment, the first magnet 1222 and the second magnet 1223 are disposed between the drive 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 both disposed on the flywheel 1224 .

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 fixed with the rotating shaft 121 by bonding, welding and other methods.

By arranging the flywheel 1224, the connection strength between the magnet and the rotating shaft 121 can be increased, and the stability of the rotating shaft 121 can be improved; in addition, by setting the first magnet 1222 and the second magnet 1223 on the same flywheel 1224, the rotation of the rotating shaft 121 can be reduced. Shaking during the process makes the rotating shaft 121 more stable during the rotation.

Please refer to FIG. 16 and FIG. 17 , the flywheel 1224 includes a disc-shaped portion 1224a and a tubular portion 1224b, the tubular portion 1224b is fixedly passed through the middle of the disc-shaped portion 1224a, and is coaxial with the disc-shaped portion 1224a, and the shaft 121 is far away from the impeller 30 One end of one end is fixedly accommodated in the tubular portion 1224b, and the first magnet 1222 and the second magnet 1223 are respectively arranged on opposite sides of the disc-shaped portion 1224a, thereby facilitating the assembly of the first magnet 1222 and the second magnet 1223, so as to facilitate It is better to fix the first magnet 1222 and the second magnet 1223 with the rotating shaft 121 .

Please refer to FIG. 18 , specifically, the first magnet 1222 and the second magnet 1223 are ring-shaped Halbach array magnets. The first magnet 1222 includes a plurality of first magnet blocks 1222a whose magnetization directions are parallel to the axis of the first magnet 1222, and the second magnet 1223 includes a plurality of second magnet blocks 1223a whose magnetization directions are parallel to the axis of the second magnet 1223, The plurality of second magnetic blocks 1223 a and the plurality of first magnetic blocks 1222 a are respectively disposed on two opposite sides of the disc-shaped portion 1224 a around the rotating shaft 121 . In the extension direction of the rotating shaft 121, each second magnetic block 1223a is arranged opposite to a first magnetic block 1222a, and the second magnetic block 1223a arranged oppositely is opposite to the side of the first magnetic block 1222a facing the disk-shaped portion 1224a. opposite polarity. Such an arrangement can facilitate the installation of the first magnet 1222 and the second magnet 1223 , and avoid the problem that the magnetic pieces of the first magnet 1222 and the magnetic pieces of the second magnet 1223 repel each other and cause difficult assembly.

In some embodiments, the first magnet 1222 further includes a plurality of third magnet blocks 1222b magnetized along the circumferential direction of the first magnet 1222, the third magnet blocks 1222b magnetized along the circumferential direction and the third magnet blocks 1222b magnetized along the axis parallel to the first magnet 1222. The first magnetic blocks 1222a are arranged alternately along the circumference where the first magnets 1222 are located. Wherein, the magnetization directions of the adjacent first magnets 1222a are opposite, for example, the magnetization direction of one of the adjacent first magnets 1222 is directed from the side of the first magnets 1222a away from the disc-shaped portion 1224a toward One side of the disk-shaped portion 1224a and the other are magnetized in a direction from the side of the first magnetic block 1222a facing the disk-shaped portion 1224a to the side away from the disk-shaped portion 1224a. The magnetization directions of adjacent third magnet blocks 1222b are opposite on the circumference where the first magnet 1222 is located.

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

It should be noted that the magnetization directions of the third magnet block 1222b and the fourth magnet block 1223b are not limited to circumferential magnetization, and in some embodiments, the magnetization directions of the third magnet block 1222b and the fourth magnet block 1223b can also be It is inclined relative to the axis of the rotating shaft 121 .

In this embodiment, the first magnet 1222 and the second magnet 1223 are provided with eight magnetic blocks, that is, the first magnetic block 1222a, the second magnetic block 1223a, the third magnetic block 1222b and the fourth magnetic block 1223b are all four . The first magnetic block 1222a , the second magnetic block 1223a , the third magnetic block 1222b and the fourth magnetic block 1223b are all sector ring magnets, and the first magnet 1222 and the second magnet 1223 are roughly ring-shaped. 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 magnet blocks, such as two, four, six or ten.

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 magnet block 1222a and the installation position of the second magnet block 1223a. The identification part 1224c may be configured as a groove, a scale line, or a logo. When installing the first magnetic block 1222a and the second magnetic block 1223a, as long as the identification part 1224c is used to identify the position of one of the first magnetic blocks 1222a and one of the second magnetic blocks 1223a, the installation position of the remaining magnetic blocks can be determined. Thus, the installation of the first magnet 1222 and the second magnet 1223 is facilitated. Specifically, the identification portion 1224c may be on at least one of the tubular portion 1224b and the disk portion 1224a.

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

Further, the glue dispensing groove 121 a extends along a direction perpendicular to the axis of the rotating shaft 121 , and the end of the glue dispensing groove 121 a extends to the outer peripheral surface of the rotating shaft 121 . Such setting can make the dispensing groove 121a arrange glue, and the glue overflows to the outer peripheral surface of the rotating shaft 121, to bond the inner peripheral wall of the tubular portion 1224b and the peripheral surface of the rotating shaft 121, so that there can be better between the rotating shaft 121 and the flywheel 1224. Alternatively, it is also convenient for the excess glue between the bonding shaft 121 and the tubular portion 1224b to overflow into the glue dispensing groove 121a.

In this embodiment, the flywheel 1224 further includes an outer ring wall 1224e disposed around the disk-shaped portion 1224a, and the outer ring wall 1224e, the tubular portion 1224b and the disk-shaped portion 1224a jointly enclose the first magnet 1222 and the second magnet. The first accommodating part and the second accommodating part of 1223, and the first accommodating part and the second accommodating part are separated by the disc-shaped part 1224a. Such setting can limit the position of the first magnet 1222 and the second magnet 1223 , which not only facilitates the installation of the first magnet 1222 and the second magnet 1223 , but also makes the combination of the first magnet 1222 and the second magnet 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 away from the disc-shaped portion 1224a is higher than the outer ring wall 1224e by a certain distance, and the side of the second magnet 1223 away from the disc-shaped portion 1224a A certain distance is higher than the outer ring wall 1224e to facilitate the assembly of the first magnet 1222 and the second magnet 1223 on the flywheel 1224 .

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. At this time, The rotating shaft 121 is fixedly passed through the disc-shaped portion 1224a, for example, the center of the disc-shaped portion 1224a. Compared with the flywheel 1224 having only the disk-shaped portion 1224a, the provision of the tubular portion 1224b can make the flywheel 1224 more stably connected to the rotating shaft 121 .

Please refer to FIG. 8 , the structure of the power stator 132 is similar to that of the driving stator 131 . Wherein, the power stator 132 includes a second back plate 1321 , a plurality of second magnetic cores 1322 and a plurality of second coils 1323 . A plurality of second magnetic cores 1322 are arranged at intervals around the rotating shaft 121 , and the extension direction of each second magnetic core 1322 is parallel to the axis of the rotating shaft 121 . One end of each second magnetic core 1322 is affixed to the second backplane 1321 , and the other end extends close to the second magnet 1223 . In other words, in the axial direction of the rotating shaft 121 , the driving stator 131 and the power stator 132 are oppositely arranged. Each second coil 1323 is respectively wound on the corresponding second magnetic core 1322 . The second coil 1323 is capable of generating a rotating magnetic field interacting with the second magnet 1223 .

Wherein, the first magnetic core 1312 and the second magnetic core 1322 include magnetic columns, the first coil 1313 is wound on the magnetic columns of the first magnetic core 1312 , and the second coil 1323 is wound on the magnetic columns of the second magnetic core 1322 . The cross-sectional area of the magnetic pillars of the first magnetic core 1312 is larger than the cross-sectional area of the magnetic pillars of the second magnetic core 1322 . That is, the magnetic columns of the first magnetic core 1312 are thicker than the magnetic columns of the second magnetic core 1322 .

The larger the cross-sectional area of the magnetic column, the larger the magnetic flux generated, the larger the torque of the stator to the magnet, and the smaller the required current, which is beneficial to reduce power consumption and heat generation. 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 limitation of the radial dimension of the blood pump 100, while the driving stator 131 does not have the rotating shaft 121 passing through the middle, so that the first magnetic The core 1312 can choose a larger cross-sectional area, in other words, such a setting can reduce the work Consumption, reduce drive device 10 heating.

In this embodiment, both the first magnetic core 1312 and the second magnetic core 1322 have only magnetic columns, that is, neither the first magnetic core 1312 nor the second magnetic core 1322 has a head (ie, a pole piece) with a larger width. In the length direction of the first magnetic core 1312 and the second magnetic core 1322, its width is constant, the entire first magnetic core 1312 can be magnetically coupled with the first magnet 1222, and the entire second magnetic core 1322 can be coupled with the second magnetic core 1322. The magnet 1223 is magnetically coupled. Compared with the magnetic core provided with pole shoes, the present application can reduce the magnetic loss and increase the magnetic force between the first magnetic core 1312 and the first magnetic body 1222, the second magnetic core 1322 and the second magnetic body 1223. Coupling density to increase the torque of the drive stator 131 to the first magnet 1222 (under equal current conditions) and the torque of the powered stator 132 to the second magnet 1223 (under equal current conditions). In addition, the headless first magnetic core 1312 and the second magnetic core 1322 can also greatly reduce the problem of motor power reduction caused by local magnetic short circuits caused by contact between adjacent magnetic cores.

The shape of the cross section of the first magnetic core 1312 and the second magnetic core 1322 having only magnetic pillars may be fan-shaped, circular, trapezoidal, fan-shaped and so on. As shown in FIG. 19 , in the illustrated embodiment, the first magnetic core 1312 and the second magnetic core 1322 having only magnetic columns are roughly triangular prism-shaped, and one edge of each magnetic core faces the axis of the rotating shaft 121 . In this embodiment, the edges of the first magnetic core 1312 and the second magnetic core 1322 are rounded. By rounding the edges, the winding of the subsequent coil can be facilitated, and at the same time, it is beneficial to protect the coating on the coil. Insulation Materials.

It can be understood that, in other embodiments, the first magnetic core 1312 and the second magnetic core 1322 may also include a head arranged at one end of the magnetic column, and the first backplane 1311 and the magnetic column of the first magnetic core 1312 are 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 may have both a magnetic column and a head, and the other may only have a magnetic column.

Please refer to FIG. 14 again. In order to make the second magnetic core 1322 of the power stator 132 as thick as possible, the shaft 121 passing through the power stator 132 needs to be thinner. It also requires greater rigidity and wear resistance. For this reason, the shaft body 1212 of the rotating shaft 121 has a first fitting section 1212a and a second fitting section 1212b. The cross-sectional area is larger than the cross-sectional area of the second fitting section 1212b, that is, the first fitting section 1212a is thicker than the second fitting section 1212b, the first fitting section 1212a passes through the shaft sleeve assembly 15, and the second fitting section 1212b passes through the Power stator 132. Wherein, the limiting ring 1214 is fixedly disposed on the first matching section 1212a.

In order to prevent the cleaning fluid from being polluted and/or the elements inside the driving device 10 corroded, both the driving stator 131 and the power stator 132 of the driving device 10 are coated with a waterproof sealing film. Wherein, the material of the waterproof sealing film may be silica gel, glue and the like.

The above-mentioned driving device 10 has at least the following advantages:

(1) The first shaft sleeve 152 and the second shaft sleeve 154 of the above-mentioned driving device 10 for supporting the rotor 12 are arranged along the rotation axis of the rotor 12, and one of the first shaft sleeve 152 and the second shaft sleeve 154 is connected to the drive housing The stopper 11b of 11 abuts to support one of the first shaft sleeve 152 and the second shaft sleeve 154, and the ring body 1542 of the second shaft sleeve 154 supporting the rotor 12 is connected to the second shaft sleeve 154 through the extension 1544 of the second bearing 154. A shaft sleeve 152 abuts to support the partition ring body 1542 and the first shaft sleeve 152 to better support the rotor 12; and the extension part 1544 and the ring body 1542 are integrated, which can reduce the assembly of parts and facilitate driving Assembly of the device 10; the communication port 11a is further set to be able to pass through the first shaft sleeve 152 and the second shaft sleeve 154, so that the first shaft sleeve 152 and the second shaft sleeve 154 can be loaded into the drive shell from the communication port 11a 11 in the mounting case 112, so that the assembly of the drive device 10 is more convenient; and the above-mentioned structural design makes the assembly of the drive device 10 not only simple and convenient, but also can improve the assembly accuracy of the drive device 10 and improve production efficiency.

(2) By setting the limit ring 1214 on the rotating shaft 121, the outer diameter of the limit ring 1214 is respectively larger than the inner diameter of the ring body 1542 and the inner diameter of the first sleeve 152, so as to limit the rotation shaft 121 in the extending direction of the shaft body 1212. position, to prevent the rotating shaft 121 from greatly moving relative to the drive housing 11 in the extension direction of the rotating shaft 121; and by setting the first flow guide groove 152b and/or the second flow guide groove 154b, it can facilitate fluid circulation and reduce the limit The effect on fluid communication when the ring 1214 abuts against the first sleeve 152 or the ring body 1542 .

(3) The aperture of the first shaft sleeve 152 near the ring body 1542 is set to be larger than the aperture of the first shaft sleeve 152 away from the ring body 1542, and the ring body 1542 is near the first shaft sleeve 152. Side bore diameter is larger than ring body The aperture on the side of 1542 facing away from the first shaft sleeve 152 can not only make the part of the first shaft sleeve 152 and the ring body 1542 that supports the rotating shaft 121 as far apart as possible, so as to reduce the shaking range of the rotating shaft 121 as much as possible, but also It can also reduce the contact area between the shaft sleeve assembly 15 and the rotating shaft 121, reduce friction, and also facilitate the flow of fluid (such as cleaning fluid).

(4) The length of the straight hole portion 154c of the second shaft hole 154a in the extending direction of the rotating shaft 121 is greater than or equal to 0.5 mm, so as to better support the rotating 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 perpendicular to the axial direction of the rotating shaft 121 is larger, and the magnetic flux of the rotating magnetic field generated by the driving stator 131 is larger. The torque of a magnet 1222 is also greater, thereby reducing the current required to drive the stator 131 to rotate the rotating shaft 121, which can ensure that the blood pump 100 consumes less power and generates less heat; by further setting the power stator 132, and The driving stator 131 and the power stator 132 can jointly drive the rotating shaft 121 to rotate around the axis of the rotating shaft 121 , thereby driving the impeller 30 to rotate, so as to provide greater driving force for the rotation of the impeller 30 .

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

It can be understood that at this time, the rotor 12 may not have a flywheel; or, there is only one flywheel, and the flywheel is used to install one of the first magnet 1222 and the second magnet 1223 .

Or, the power stator 132 is positioned between two flywheels, that is, one flywheel is positioned between the impeller 30 and the power stator 132, the other flywheel is positioned between the power stator 132 and the drive stator 131, and the first magnet 1222 is fixed between the power stator 132 and the drive stator. On the flywheel between the stators 131, the second magnet 1223 is fixed on the flywheel between the impeller 30 and the power stator 132, that is, the first magnet 1222 is located between the power stator 132 and the driving stator 131, and the second magnet 1223 is located at the impeller 30 And between the power stator 132. It can be understood that at this time, the rotor 12 may also not have a flywheel.

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

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

The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be described in the foregoing embodiments Modifications to the technical solutions recorded, or equivalent replacements for some 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 each embodiment of the present invention, and should be included in the scope of the present invention. within the scope of protection.

Claims (20)

1. A driving device, characterized in that it comprises:

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

   The rotor is rotatably mounted on the drive case, part of the rotor is accommodated in the drive case, and part of the rotor extends outside the drive case;

   a stator mechanism housed in the drive housing, the stator mechanism can generate a rotating magnetic field that drives the rotor to rotate; and

   A shaft sleeve assembly, including a first shaft sleeve and a second shaft sleeve mounted on the drive housing, the first shaft sleeve and the second shaft sleeve are arranged along the rotation axis of the rotor, and the first shaft sleeve One of the second sleeves abuts against the limiting portion, the second sleeve includes a ring body and an extension extending from the ring body, the extension is in contact with the first The bushing abuts so that the ring body is spaced from the first bushing, wherein the rotor is rotatably passed through the first bushing and the ring body, and the communication port can be used for the The first sleeve and the second sleeve pass through.
2. The driving device according to claim 1, wherein the rotor comprises:

   A rotating shaft, the rotating shaft includes a shaft body and a limiting ring arranged around the shaft body, the shaft body is rotatably passed through the first sleeve and the ring body, and one end of the shaft body accommodates In the drive case, the other end extends from the communication port to the outside of the drive case, the limit ring is located between the ring body and the first sleeve, and the limit ring is located in the Between the shaft body and the extension part, 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 sleeve, so as to align the rotation shaft in the extending direction of the shaft body. limit;

   The magnetic assembly is fixedly connected to the shaft body, wherein the stator mechanism can generate a rotating magnetic field that drives the magnetic assembly to rotate, and the magnetic assembly can drive the rotating shaft to rotate.
3. The driving device according to claim 2, wherein the extension part is annular, the extension part is coaxial with the ring body, and the inner diameter of the extension part is larger than the outer diameter of the limiting ring, so A gap for fluid communication is formed between the extension part and the limiting ring.
4. The driving device according to claim 2, characterized in that, the first shaft sleeve has a first shaft hole, and a first guide is opened on the side of the first shaft sleeve facing the limit ring. groove, the first diversion groove communicates with the first shaft hole, the shaft body is rotatably passed through the first shaft hole, and there is a gap between the shaft body and the first shaft hole for gaps for fluid flow;

   And/or, the ring body has a second shaft hole, and a second diversion groove is opened on the side of the ring body facing the limit ring, and the second diversion groove is connected with the second The shaft hole communicates, the shaft body is rotatably passed through the second shaft hole, and there is a gap for fluid communication between the shaft body and the second shaft hole.
5. The driving device according to claim 2, wherein the spacer ring has an outer ring surface and two end faces connected to the outer ring surface, and the joints between the outer ring surface and the two end faces are provided with There are chamfers.
6. The driving device according to claim 1, wherein a positioning groove is opened on the first shaft sleeve, and the end of the extension part away from the ring body is accommodated in the positioning groove, so as to align the Positioning of the second bushing.
7. The driving device according to claim 1, wherein the first shaft sleeve includes a disc portion and a circular truncated portion formed on a surface of the disc portion, the first shaft sleeve has a first shaft hole, and the The first shaft hole extends from the surface of the disk portion away from the truncated truncated portion to the end surface of the truncated truncated portion away from the end of the disk portion; The body is coaxial, the extension part is sleeved on the circular truncated part, and the end surface of the extension part away from the end of the ring body is in contact with the disk part, wherein the rotor is rotatably mounted on the the first shaft hole.
8. The driving device according to claim 1, characterized in that, the aperture of the first bushing on the side close to the ring body is larger than the aperture on the side of the first bushing away from the ring body; And/or, the diameter of the hole on the side of the ring body close to the second sleeve is larger than the diameter of the hole on the side of the ring body away from the ring body.
9. The driving device according to claim 1, wherein the second bushing has a second shaft hole, The second shaft hole has a straight hole and a tapered hole connected to the straight hole, the smaller end of the tapered hole communicates with the straight hole, and the larger end of the tapered hole faces The first sleeve and the rotor are rotatably passed through the straight hole and the tapered hole.
10. The driving device according to claim 9, wherein the length of the straight hole portion in the direction of the rotation axis of the rotor is greater than or equal to 0.5 mm.
11. The driving device according to claim 1, wherein the second shaft sleeve has a second shaft hole, from a side close to the first shaft sleeve to a side away from the first shaft sleeve, the The diameter of the second shaft hole gradually decreases; or, from the side close to the first shaft sleeve to the side away from the first shaft sleeve, the diameters of the second shaft hole are equal.
12. The driving device according to claim 1, wherein the driving housing comprises a housing body and a mounting housing docked with the housing body, and the first shaft sleeve and the second shaft sleeve are installed on the The installation case, the stator mechanism is accommodated in the case body, and the communication port and the limiting part are both arranged in the installation case.
13. The drive device according to claim 12, wherein the shell body and the mounting shell are both cylindrical, and an open end of the mounting shell is docked with an open end of the shell body; the communication The mouth is the opening of the end of the installation shell away from the shell body; the limiting part is located at the end of the installation shell away from the communication port, and the limiting part is arranged on the installation shell The ring-shaped protrusion on the inner wall.
14. The driving device according to claim 12, characterized in that, one end of the installation shell close to the shell body is provided with a first glue slot communicating with the inner hole of the installation shell, and the first glue slot is The groove can be provided with adhesive, so as to bond and fix the installation shell, the first bushing and the end of the extension part away from the ring body; and/or,

    A second glue groove is also provided on the outer wall of the second shaft sleeve, and the second glue groove can be provided with adhesive to bond and fix the installation shell and the second shaft sleeve.
15. 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 accommodated in the driving housing, and the other end extends out of the driving housing, and the rotating shaft is opposite to the The drive housing can rotate, the magnetic assembly includes a first magnet and a second magnet, and both the first magnet and the second magnet are fixed to the rotating shaft;

    The stator mechanism includes a drive stator and a power stator, the drive stator and the power stator are arranged along the rotation axis of the rotating shaft, the drive stator can generate a rotating magnetic field that drives the first magnet to rotate, and the power stator A rotating magnetic field that drives the second magnet to rotate can be generated; wherein the first magnet is located between the drive stator and the power stator, wherein the rotating shaft passes through the power stator, and the drive stator spaced from the rotating shaft in the extending direction of the rotating shaft.
16. The driving device according to claim 15, 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, and the plurality of first magnetic cores The magnetic core is arranged around the straight line where the rotation axis of the rotating shaft is located; the power stator includes a plurality of second magnetic cores and a plurality of second coils respectively wound around a plurality of the second magnetic cores, and the plurality of the first magnetic cores Two magnetic cores are arranged around the rotating shaft for a circle, wherein both the first magnetic core and the second magnetic core include magnetic columns, and the cross-sectional area of the magnetic columns of the first magnetic core is larger than that of the second magnetic core. The cross-sectional area of the magnetic pillar of the magnetic core.
17. The driving device according to claim 16, wherein the driving stator further comprises a first back plate, one end of each first magnetic core is fixedly connected to the first back plate, and the other end extends to be close to the first back plate. said first magnet;

    The driving device also includes a fixing piece, the fixing piece is fixed in the driving shell, and a positioning column is arranged on the fixing piece; a positioning hole for the positioning column to pass through is arranged on the first back plate .
18. The driving device according to claim 15, wherein the rotating shaft has a first fitting section and a second fitting section, the cross-sectional area of the first fitting section is larger than the cross-sectional area of the second fitting section, The first fitting section is rotatably passed through the shaft sleeve assembly, and the second fitting section is rotatably passed through the power stator.
19. 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 accommodated in the driving housing, and the other end extends out of the driving housing, and the rotating shaft is opposite to the described The drive housing can rotate, and the magnetic assembly includes a first magnet and a second magnet;

    The magnetic assembly also includes a flywheel, the flywheel includes a disc-shaped part, a tubular part and an outer ring wall arranged around the disc-shaped part, the tubular part is fixedly passed through the middle part of the disc-shaped part, and is connected with The disc-shaped part is coaxial, and the outer ring wall, the tubular part and the disc-shaped part jointly enclose a first accommodating part for accommodating the first magnet and accommodating the second magnet a second housing portion, the first housing portion and the second housing portion are separated by the disk portion;

    In the axial direction of the tubular part, the side of the first magnet away from the disc-shaped part is higher than the outer ring wall, and the side of the second magnet away from the disc-shaped part is higher than said outer ring wall;

    One end of the rotating shaft is fixedly accommodated in the tubular portion.
20. A blood pump, characterized in that it includes: a driving device and an impeller; the driving device includes:

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

    The rotor is rotatably mounted on the drive case, part of the rotor is accommodated in the drive case, and part of the rotor extends outside the drive case;

    a stator mechanism housed in the drive housing, the stator mechanism can generate a rotating magnetic field that drives the rotor to rotate; and

    A shaft sleeve assembly, including a first shaft sleeve and a second shaft sleeve mounted on the drive housing, the first shaft sleeve and the second shaft sleeve are arranged along the rotation axis of the rotor, and the first shaft sleeve One of the second sleeves abuts against the limiting portion, the second sleeve includes a ring body and an extension extending from the ring body, the extension is in contact with the first The bushing abuts so that the ring body is spaced from the first bushing, wherein the rotor is rotatably passed through the first bushing and the ring body, and the communication port can be used for the The first sleeve and the second sleeve pass through;

    The impeller is arranged outside the drive housing, the impeller is fixedly connected with the rotor, and can rotate with the rotor.