WO2023160422A1 - Blood pump and driving device therefor - Google Patents

Abstract

A blood pump (100) and a driving device (10) therefor. The driving device (10) comprises: a driving 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 portion (11b) is further provided in the driving housing (11); the rotor (12) is rotatably mounted on the driving housing (11); the shaft sleeve assembly (15) comprises a support member (151), a separation member (152), and a limiting member (153), the separation member (152) separately abuts against the support member (151) and the limiting member (153), the side of the support member (151) away from the separation member (152) abuts against the limiting portion (11b), the rotor (12) passes through the support member (151) and the limiting member (153), and the communication port (11a) can allow the support member (151), the separation member (152) and the limiting member (153) to pass through.

Description

Blood pump and its driving device

This application claims priority to a Chinese patent application with application number 202210169089.9 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 has a communication port, and a limiting part is also arranged in the driving shell;

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

A stator mechanism, accommodated in the drive housing, capable of generating a rotating magnetic field that drives the rotor to rotate;

The bushing assembly includes a support, a spacer and a limiter, the support, the spacer and the limiter are sequentially arranged on the drive housing along the rotation axis of the rotor, and the spacers are respectively abut against the support member and the limiting member, and the side of the support member away from the partition abuts against the limiting part, wherein the rotor passes through the support member and the limiting member. The limiting member, the communication port can allow the support member, the partition and the limiting member to 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 in a first embodiment of the present invention;

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

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

Fig. 4 is an exploded view of the driving device of the blood pump shown in Fig. 1;

Fig. 5 is a partial sectional view of the driving device of the blood pump shown in Fig. 3;

Fig. 6 is a structural schematic diagram of the driving device of the blood pump shown in Fig. 1 omitting the driving case;

Fig. 7 is a cross-sectional view of the driving device shown in Fig. 6 along B-B;

Fig. 8 is a sectional view of the driving device shown in Fig. 5 omitting the rotating shaft;

Fig. 9 is a schematic structural view of the support shown in Fig. 4;

Fig. 10 is a structural schematic diagram of another angle of the magnetic assembly of the driving device shown in Fig. 4;

Fig. 11 is a cross-sectional view of the magnetic assembly shown in Fig. 10 along C-C;

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

Fig. 13 is a schematic structural view of the rotating shaft of the driving device shown in Fig. 4;

Fig. 14 is a schematic structural view of the driving stator of the driving device shown in Fig. 4;

Fig. 15 is a schematic structural diagram of the blood pump shown in Fig. 2 omitting the catheter assembly;

Fig. 16 is a sectional view of the blood pump shown in Fig. 15 along X-X;

Fig. 17 is an enlarged view of the L portion of Fig. 16;

Fig. 18 is another exploded view of the driving housing of the driving device shown in Fig. 4;

Fig. 19 is a cross-sectional view of the assembly of the rotating shaft, the installation shell of the drive shell and the shaft sleeve assembly according to the second embodiment of the present invention.

The meanings of the marks in the figure are:

100, blood pump; 10, driving device; 11, driving shell; 11a, communication port; 11b, limit part; 11c, shell body; 11d, installation shell; 114, separation cavity; 115, protective piece; 1151, communication hole 116, installation port; 117, sealing cover; 12, rotor; 121, rotating shaft; 121a, limit ring; 121b, dispensing groove; 122, magnetic assembly; 1222, first magnet; , the third magnetic block; 1223, the second magnet; 1223a, the second magnetic block; 1223b, the fourth magnetic block; 1224, the flywheel; 1224a, the disc-shaped part; 1224b, the tubular part; Protrusion; 1224e, outer ring wall; 13, stator mechanism; 131, driving stator; 1311, first back plate; 1311a, positioning hole; 1312, first magnetic core; 1313, first coil; 132, power stator; 1321 1322, the second magnetic core; 1323, the second coil; 14, the fixing piece; 141, the positioning column; 142, the through hole; 143, the supporting hole; 15, the bushing assembly; 151, the supporting piece; 151a, limit section; 151b, the first glue tank; 151c, the first fluid tank; 152, the separator; 153, the limit piece; 153a, the diameter reducing section; Fluid tank; 16, electric wire; 20, casing assembly; 21, inflow port; 22, outflow port; 23, pigtail tube; 30, impeller; 40, conduit assembly; 411, cleaning pipeline;

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.

Please refer to FIG. 1 and FIG. 2 , 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 bushing assembly 20 Extending through a heart valve, such as the aortic valve, while the inflow port 21 is located within the heart, 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.

Please refer to FIG. 3 together. Furthermore, the blood pump 100 further includes a catheter assembly 40, which is connected to the driving device 10. A supply line is arranged inside the catheter assembly 40. The supply line includes a cleaning fluid for feeding the driving device 10. The purge line 411. 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.

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 .

Please refer to FIG. 4 , the drive housing 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 refer to FIG. 4 and FIG. 5 , the drive housing 11 is further provided with a limiting portion 11 b. In this embodiment, the drive housing 11 includes a housing body 11c and an installation housing 11d docked with the housing body 11c, and the communication port 11a and the limiting portion 11b are both disposed on the installation housing 11d. Specifically, both the case body 11c and the mounting case 11d are substantially cylindrical. The limiting portion 11b is an annular protrusion provided on the inner wall of the installation shell 11d. An open end of the installation shell 11d is docked with an open end of the shell body 11c, and the communication port 11a is an opening of an end of the installation shell 11d away from the shell body 11c. Wherein, the limiting portion 11b is located at an end of the installation shell 11d away from the communication port 11a, that is, an end of the installation shell 11d close to the shell body 11c.

The rotor 12 is rotatably installed in the drive housing 11 , part of the rotor 12 is housed in the drive housing 11 , and part is located outside the drive housing 11 and fixedly connected to the impeller 30 , the rotor 12 can drive the impeller 30 to rotate.

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 drive housing 11, and the other end extends from the communication port 11a to the outside of the driving housing 11 and is fixedly connected to the impeller 30. The rotating shaft 121 can be opposite to the driving housing 11. Rotate, the magnetic assembly 122 is fixedly connected with the rotating shaft 121 . Specifically, the rotating shaft 121 is passed through the installation shell 11d, one end is accommodated in the shell body 11c, and the other end extends from the communication port 11a to the outside of the driving shell 11 and is fixedly connected to the impeller 30. The magnetic assembly 122 is located in the housing body 11 c 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 11 c of the driving housing 11 .

Please refer to FIG. 6 and FIG. 7 together, the magnetic 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 The magnetic core 1312 is provided with a first coil 1313 . 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 post 141; the first back plate 1311 is provided with a positioning hole 1311a, and the positioning post 141 is penetrated in the positioning hole 1311a, so as to facilitate the positioning of the driving stator 131 Install. 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 opened on the fixing member 14, and a support body 412 is also provided in the catheter assembly 40, and the support body 412 is used to support the function of the catheter assembly 40 and/or the blood pump 100 when the blood pump 100 is delivered, and supports One end of the body 412 can be accommodated in the supporting hole 143 . Specifically, the support body 412 is, for example, nickel-titanium wire.

Please refer to FIG. 3 to FIG. 7 , the bushing assembly 15 includes a support 151 , a spacer 152 and a limiter 153 , and the support 151 , the spacer 152 and the limiter 153 are sequentially arranged on the drive housing 11 along the rotation axis of the rotor 12 , the spacer 152 abuts against the support 151 and the limiter 153 respectively, and the side of the support 151 away from the spacer 152 abuts with the limiter 11b to limit the support 151, wherein the rotor 12 can Through the support piece 151 and the limit piece 153, the communication port 11a can pass through the support piece 151, the partition piece 152 and the stop piece 153, so that the support piece 151, the partition piece 152 and the limit piece 153 can pass through the communication port 11a. 11a is put into the installation shell 11d of the drive shell 11, which can facilitate the assembly of the drive device 10, improve assembly accuracy, and improve production efficiency.

In one embodiment, the supporting member 151 is ring-shaped or cylindrical, and the rotor 12 (specifically, the rotating shaft 121 ) is rotatably passed through the supporting member 151 . A gap through which cleaning fluid passes is formed between the support member 151 and the rotor 12 . At this time, the support member 151 and the rotating shaft 121 form a bearing structure, and the cleaning fluid acts as a lubricant between the supporting member 151 and the rotating shaft 121 .

Please refer to FIG. 8 together. Specifically, the support member 151 has a limit section 151a, and the gap between the support member 151 at the limit section 151a and the rotor 12 (specifically, the rotating shaft 121) is smaller than that between the rest of the support member 151 and the rotor. 12 (specifically, the gap between the rotating shaft 121). Setting the limiting section 151a to reduce the gap between the support member 151 and the rotating shaft 121 can reduce the shaking of the rotating shaft 121. The contact area reduces the friction between the support member 151 and the rotating shaft 121 .

In one of the embodiments, the outer wall of the support member 151 is fixedly connected with the inner wall of the installation shell 11d of the driving shell 11 through adhesive. In order to facilitate the fixed installation of the support member 151 in the installation shell 11d, a first glue groove 151b is provided on the outer peripheral surface of the support member 151 . The provision of the first glue slot 151b can facilitate bonding and fixing the support member 151 and the installation shell 11d by setting adhesive in the first glue slot 151b.

It can be understood that, in some embodiments, the support member 151 may not be fixedly connected to the drive housing 11 , and the two ends of the support member 151 are respectively abutted against the partition member 152 and the limiting portion 11 b to be positioned.

In one embodiment, the separator 152 is a cylindrical member or an annular member, the rotor 12 is rotatably passed through the separator 152 , and a gap for the cleaning fluid to flow is formed between the rotor 12 and the separator 152 . Specifically, there is no connection between the spacer 152 and the inner wall of the drive case 11 (that is, it is not connected with the drive case 11 by bonding, welding, etc.), and only the two ends of the spacer 152 are respectively connected with the support 151 and the limiter. The position piece 153 abuts against and is positioned in the driving housing 11 , which further simplifies the assembly of the driving device 10 .

It can be understood that, in other embodiments, the spacer 152 can also be formed by a plurality of arc-shaped pieces or block-shaped pieces surrounding the shaft 121; Inside the shell 11.

In one embodiment, the limiting member 153 is ring-shaped or cylindrical, and the limiting member 153 is fixedly connected to the driving shell 11 . The limiting member 153 is disposed at the communication port 11 a of the drive housing 11 . Wherein, a gap is formed between the limiting member 153 and the rotor 12 (specifically, the rotating shaft 121 ), and the rotor 12 can rotate relative to the limiting member 153 . At this time, the limiting member 153 and the rotating shaft 121 form a bearing structure, and the cleaning fluid acts as a lubricant between the limiting member 153 and the rotating shaft 121 .

Specifically, the limiting member 153 has a reduced diameter section 153a, and the gap between the limiting member 153 at the reduced diameter section 153a and the rotor 12 (specifically, the rotating shaft 121) is smaller than the rest of the limiting member 153 and the rotor 12 (specifically, The gap between the shafts 121). The reduced-diameter section 153a is provided to reduce the gap between the limiting member 153 and the rotating shaft 121, which can reduce the shaking of the rotating shaft 121. The contact area of the rotating shaft 121 reduces the friction between the limiting member 153 and the rotating shaft 121 .

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

In one embodiment, the minimum gap between the limiting member 153 at the reduced-diameter section 153 a 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 passing through the gap between the stopper 153 and the rotating shaft 121 The gap enters the inside of the drive case 11 .

Specifically, the diameter-reducing section 153 a is located on a side of the limiting member 153 away from the partition member 152 . It can be understood that, in other embodiments, the diameter-reducing section 153a may also be located in the middle of the limiting member 153 in the direction of extension of the rotating shaft 121; The rotating shaft 121 can be limited to effectively prevent blood from entering the inside of the drive housing 11, and can also prevent substances in the blood from accumulating in the diameter-reducing section 153a.

Wherein, by setting the limiting member 153 , the assembly size requirements of the rotating shaft 121 and the installation shell 11 d can be reduced, and the rotational friction of the rotating shaft 121 can be reduced at the same time. Adding the supporting member 151 on the basis of the limiting member 153 can improve the rotation stability of the rotating shaft 121 . The spacer 152 provided between the limiting member 153 and the supporting member 151 can limit the limiting member 153 and the supporting member 151 along the extension direction of the rotating shaft 121 .

Specifically, the limiting member 153 is adhesively fixed to the driving shell 11 . In order to facilitate the fixed installation of the limiting member 153 in the installation shell 11d, the outer peripheral surface of the limiting member 153 is provided with a second glue groove 153b. The setting of the second glue groove 153b can facilitate the bonding and fixing of the limiting member 153 and the installation shell 11d by setting an adhesive in the second glue groove 153b.

In this embodiment, the rotating shaft 121 has a limiting ring 121a, and the limiting ring 121a is fixedly sleeved on the rotating shaft 121 . Wherein, the limiting ring 121a and the rotating shaft 121 can be integrally formed, or fixed with the rotating shaft 121 by bonding, welding and other methods. In the extending direction of the rotating shaft 121 , the limiting ring 121 a is located between the limiting member 153 and the supporting member 151 , and in the direction perpendicular to the extending direction of the rotating shaft 121 , the limiting ring 121 a is located between the rotating shaft 121 and the separator 152 . The outer diameter of the limiting ring 121a is greater than the inner diameter of the limiting member 153, and at the same time, the outer diameter of the limiting ring 121a is also greater than the inner diameter of the support member 151, so as to limit the rotation shaft 121 in the extension direction of the rotating shaft 121, and prevent the rotating shaft 121 from The rotating shaft 121 moves substantially relative to the driving shell 11 in the extending direction.

Wherein, the cleaning fluid passing through the cleaning pipeline 411 into the inside of the drive housing 11 flows through the gap between the support member 151 and the rotating shaft 121, the gap between the limiting ring 121a and the partition 152, and the limiting member 153 and the rotating shaft 121 The gap between them, 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 lubrication between the rotating shaft 121 and the limiting member 153, and between the rotating shaft 121 and the supporting member 151. effect.

Please refer to FIG. 9 together. In this embodiment, a first fluid groove 151c is provided on the side of the support member 151 close to the limit ring 121a, and the extension direction of the first fluid groove 151c is perpendicular to the extension direction of the rotating shaft 121 or Intersect; wherein, the first fluid groove 151c communicates with the gap between the support member 151 and the rotating shaft 121 . A second fluid groove 153c is provided on the side of the limiting member 153 facing the limiting ring 121a, and the extending direction of the second fluid groove 153c is perpendicular to or intersects with the extending direction of the rotating shaft 121; wherein, the second fluid groove 153c is connected to the limiting The gap between the position piece 153 and the rotating shaft 121 . In this way, fluid circulation is facilitated. It should be noted that, in other embodiments, one of the limiting member 153 and the supporting member 151 can also be One with a fluid slot, or one without a fluid slot.

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

Please combine Fig. 6 and Fig. 7 again, further, the magnetic assembly 122 also includes a second magnet 1223, and the second magnet 1223 is fixedly connected with the rotating shaft 121; The axis of 121 is arranged, 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 extension 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 arranged 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. 10 and FIG. 11 , 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, so as to facilitate the assembly of the first magnet 1222 and the second magnet 1223, so that In order to better fix the first magnet 1222 and the second magnet 1223 to the rotating shaft 121 .

Please refer to FIG. 11 and FIG. 12 , 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, There are four second magnetic blocks 1223a, third magnetic blocks 1222b and fourth magnetic blocks 1223b. 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 rotating shaft 121 by bonding. Please refer to FIG. 13 , a dispensing groove 121b is provided at the end of the rotating shaft 121 far away from the impeller 30 , and a stop protrusion 1224d abutting against the dispensing groove 121b is provided on the inner wall of the tubular portion 1224b. In this way, glue can be arranged in the glue dispensing groove 121b to facilitate the fixing of the rotating shaft 121 and the stop protrusion 1224d.

Further, the glue dispensing groove 121b extends along a direction perpendicular to the axis of the rotating shaft 121 , and the end of the glue dispensing groove 121b extends to the outer peripheral surface of the rotating shaft 121 . Such setting can make the dispensing groove 121b 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 part 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. Or, it is also convenient for the excess glue between the bonding shaft 121 and the tubular part 1224b to overflow into the glue dispensing groove 121b.

Please refer to FIG. 11 , in this embodiment, the flywheel 1224 further includes an outer ring wall 1224e arranged around the disc-shaped portion 1224a, and the outer ring wall 1224e, the tubular portion 1224b and the disc-shaped portion 1224a jointly enclose the first magnet respectively. 1222 and the first accommodating portion and the second accommodating portion of the second magnet 1223, and the first accommodating portion and the second accommodating portion are separated by the disk portion 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. 6 and FIG. 7 , 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 .

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 an arrangement can reduce power consumption and reduce heat generation of the driving device 10 .

Please refer to FIG. 7 and FIG. 14, in this embodiment, both the first magnetic core 1312 and the second magnetic core 1322 have only magnetic columns, that is, the first magnetic core 1312 and the second magnetic core 1322 do not have a large width. The head (that is, the pole shoe) has a constant width in the length direction of the first magnetic core 1312 and the second magnetic core 1322, and the entire first magnetic core 1312 can be magnetically coupled with the first magnet 1222, and the entire Both the second magnetic cores 1322 can be magnetically coupled with the second magnets 1223. Compared with the magnetic cores provided with pole shoes, the present application can reduce the magnetic loss, increase the first magnetic core 1312 and the first magnetic body 1222, and the second magnetic core 1322 and the magnetic coupling density between the second magnet 1223, to increase the torque of the driving stator 131 to the first magnet 1222 (under equal current conditions) and the torque of the power 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. 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.

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.

Please refer to FIG. 15 to FIG. 17 , the drive housing 11 also has a partition chamber 114 . The driving device 10 also includes an electric wire 16, which is connected to the stator mechanism 13, a part of the electric wire 16 is located between at least part of the magnetic assembly 122 and the drive shell 11, and a part of the electric wire 16 is located between the magnetic assembly 122 and the drive shell 11. The part between them is accommodated in the partition cavity 114 , so that the cavity wall of the partition cavity 114 prevents the electric lead 16 from contacting the magnetic component 122 . In the illustrated embodiment, the electrical wire 16 is electrically connected to the power stator 132 , specifically, the electrical wire 16 is electrically connected to the second coil 1323 of the power stator 132 . Wherein, between the first magnet 1222 and the drive shell 11, and between the second magnet 1223 and the drive shell 11, there are electric wires 16, the part of the electric wire 16 located between the first magnet 1222 and the drive shell 11, and the part located between the first magnet 1222 and the drive shell 11. The part between the second magnet 1223 and the driving shell 11 is accommodated in the partition cavity 114 . The position of the magnetic assembly 122 corresponds to the position of the compartment 114 .

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

By setting the separation cavity 114, the electric wire 16 electrically connected to the stator mechanism 13 is separated from the rotatable magnetic assembly 122, which can effectively prevent the magnetic assembly 122 from contacting the electric wire 16 during the rotation process so that the electric wire 16 follows the magnetic assembly. 122 rotates to cause failure risks such as breakage or falling off of the electrical lead 16, thereby further ensuring the normal use of the blood pump 100.

Further, a protective piece 115 is fixed inside the driving shell 11 , and the protective piece 115 and the driving shell 11 together define a partition cavity 114 . The position of the guard 115 corresponds to the position of the magnet assembly 122 , that is, the position of the guard 115 corresponds to the position of the first magnet 1222 and the position of the second magnet 1223 . The guard 115 is located between the magnetic assembly 122 and the electric lead 16 , and the guard 115 prevents the electric lead 16 from contacting the magnetic assembly 122 . That is, the guard 115 separates the first magnet 1222 , the second magnet 1223 and the flywheel 1224 from the separation cavity 114 .

Specifically, the protective member 115 is provided with a communication hole 1151 through which the power supply wire 16 passes, so that the electrical wire 16 can pass through the communication hole 1151 to electrically connect the stator mechanism 13 .

Please refer to Fig. 18, in order to facilitate the installation of the electric wire 16 connecting the driving stator 131 and the power stator 132, the housing body 11c is also provided with an installation opening 116, and the driving housing 11 also includes a sealing cover 117, which is located on the sealing surface. On the installation port 116, the protective member 115 covers part of the installation port 116, and the compartment 114 is at least partially formed by the sealing cover 117 and the protective member. 115 are jointly surrounded and formed.

In some embodiments, the separation cavity 114 is not limited to be formed by setting the guard 115. In some embodiments, the separation cavity 114 can also be directly provided on the side wall of the drive case 11 for the power supply wire 16 to pass through. set channel.

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 axis of the rotating shaft 121, and the first magnet 1222 and the second magnet 1223 are installed on the two flywheels respectively. Now, the position of the separation chamber 114 is corresponding to the first magnet 1222 and the second magnet 1223, between the flywheel and the electric lead 16 where the first magnet 1222 is installed, and between the flywheel and the electric lead 16 where the second magnet 1223 is installed, there are guards. piece 115. It can be understood that at this time, the rotor 12 may not have a flywheel, and at this time, the guard 115 is provided between the first magnet 1222 and the electric wire 16 , and between the second magnet 1223 and the electric wire 16 . Alternatively, there is only one flywheel, which 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 the power stator 132, at this time, there is an electric lead 16 between the first magnet 1222 and the drive housing 11, in order to avoid the electric lead 16 from contacting with the first magnet 1222 or the flywheel that the first magnet 1222 is installed, the electric lead 16 The portion between the first magnet 1222 and the driving shell 11 is accommodated in the partition cavity 114 . Correspondingly, the guard 115 is located between the flywheel on which the first magnet 1222 is mounted and the electrical lead 16 . It can be understood that at this time, the rotor 12 may not have a flywheel, and the guard 115 is located between the first magnet 1222 and the electric wire 16 .

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, at this time, the arrangement of the partition chamber 114 can be similar to that of Figure 7, Figure 8, Figure 22 and Figure 23; or, the power stator 132 is located between the first magnet 1222 and the second magnet 1223, or, the drive stator 131 and the power stator 132 are all located between the first magnet 1222 and the second magnet 1223. At this time, there is an electric wire 16 between the first magnet 1222 and the drive housing 11. In order to avoid the electric wire 16 from contacting the first magnet 1222 or the The flywheel of the first magnet 1222 is in contact, and the portion of the electric wire 16 between the first magnet 1222 and the driving shell 11 is accommodated in the separation cavity 114 . Correspondingly, the guard 115 is located between the flywheel on which the first magnet 1222 is mounted and the electrical lead 16 . It can be understood that, at this time, the rotor 12 may not have a flywheel, and at this time, the guard 115 is located between the first magnet 1222 and the electric wire 16 .

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

As shown in FIG. 19 , the driving device of the second embodiment has substantially the same structure as the driving device 10 of the first embodiment, the difference lies in that the support member 151' in the bushing assembly 15' of the driving device of the second embodiment Direct replacement with bearings. The supporting member 151' has an outer ring and an inner ring capable of rotating relative to the outer ring, the inner ring of the supporting member 151' is fixedly connected to the rotating shaft 121' of the rotor, the outer ring is fixedly connected to the mounting shell 11d' of the driving shell, and the spacer 152' The side away from the limiting part 153' abuts against the outer ring of the supporting part 151'. At this time, the limiting portion 11b' abuts against the outer ring of the support member 151'.

Since the driving device of the second embodiment is similar in structure to the driving device 10 of the first embodiment, it also has the effect of facilitating assembly.

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 has a communication port, and a limiting part is also arranged in the driving shell;

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

   A stator mechanism, accommodated in the drive housing, capable of generating a rotating magnetic field that drives the rotor to rotate;

   The bushing assembly includes a support, a spacer and a limiter, the support, the spacer and the limiter are sequentially arranged on the drive housing along the rotation axis of the rotor, and the spacers are respectively abut against the support member and the limiting member, and the side of the support member away from the partition abuts against the limiting part, wherein the rotor passes through the support member and the limiting member. The limiting member, the communication port can allow the support member, the partition and the limiting member to pass through.
2. The driving device according to claim 1, wherein the driving shell comprises a shell body and a mounting shell docked with the shell body, and the support member, the spacer and the limiting member are installed on the In the installation case, the stator mechanism is accommodated in the case body, and the communication port and the limiting portion are both arranged in the installation case.
3. The driving device according to claim 2, wherein the shell body and the mounting shell are both cylindrical in shape, an open end of the mounting shell is docked with an open end of the shell body, and the communication The opening is an opening at an end of the installation shell away from the shell body, and the limiting portion is located at an end of the installation shell away from the communication opening.
4. The driving device according to claim 2, wherein the limiting part is an annular protrusion provided on the inner wall of the installation shell.
5. The driving device according to claim 1, wherein the limiting member is a cylindrical member or an annular member, the limiting member is fixedly connected to the driving housing, and the limiting member is close to the driving housing The communicating port is set, a gap is formed between the limiting member and the rotor, wherein the rotor can rotate relative to the limiting member, the limiting member has a diameter-reducing section, and the limiting member The gap between the part at the reduced diameter section and the rotor is smaller than the gap between the rest of the limiting part and the rotor.
6. The driving device according to claim 5, wherein the diameter-reducing section is located on a side of the limiting member away from the partition member.
7. The driving device according to claim 1, wherein the partition is annular or cylindrical, the rotor is rotatably passed through the partition, and the support and the limiter are both connected to each other. The drive housing is fixedly connected, and both the support member and the limiting member are in close contact with the partition to limit the sliding of the partition.
8. The driving device according to claim 1, wherein the support member is a ring member or a cylindrical member, the support member is fixedly connected to the drive housing, and the rotor is rotatably passed through the support member. pieces;

   Alternatively, the supporting member is a bearing, the supporting member has an outer ring and an inner ring capable of rotating relative to the outer ring, the inner ring of the supporting member is fixedly connected to the rotor, and the outer ring is connected to the The drive housing is fixedly connected, and the side of the spacer away from the limiting member abuts against the outer ring of the support member.
9. The driving device according to claim 1, characterized in that, the supporting member is ring-shaped or cylindrical, a gap is formed between the supporting member and the rotor, the supporting member has a limiting section, the The gap between the support member at the limiting section and the rotor is smaller than the gap between the rest of the support member and the rotor.
10. The driving device according to claim 1, characterized in that, the support member is ring-shaped or cylindrical, the limiter is ring-shaped or cylindrical, and the rotor is rotatably passed through the support member and the limiter, there is a gap between the rotor and the support, and there is a gap between the rotor and the limiter, wherein the minimum gap between the rotor and the support is greater than The minimum gap between the rotor and the limiting member.
11. 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 from the communication port to the outside of the driving housing, The rotating shaft can rotate relative to the drive housing, the magnetic assembly is fixedly connected to the rotating shaft, and the stator mechanism can generate a rotating magnetic field that drives the magnetic assembly to rotate, so that the magnetic assembly can drive the rotating shaft around the shaft of the shaft line rotation;

    The rotating shaft is provided with a limit ring, the limit ring is fixedly arranged around the rotating shaft, the limit ring is located between the support member and the limit member, and the limit ring is located on the Between the rotating shaft and the spacer, the outer diameter of the limiting ring is respectively larger than the inner diameter of the supporting member and the inner diameter of the limiting member, so as to limit the rotating shaft in the extending direction of the rotating shaft .
12. The driving device according to claim 11, wherein a first fluid groove is formed on the end surface of the support member facing the partition member, and the extension direction of the first fluid groove is in the same direction as the extension direction of the rotating shaft. perpendicular or intersecting; and/or, a second fluid groove is formed on the end surface of the limiting member facing the separator, and the extension direction of the second fluid groove is perpendicular to or intersects with the extension direction of the rotating shaft.
13. 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 is located outside the driving housing, and the rotating shaft is opposite to the The drive housing is rotatable, 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 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 can Generate a rotating magnetic field that drives the second magnet to rotate; 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.
14. The driving device according to claim 13, 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 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 second magnetic cores The magnetic core is arranged around the rotating shaft for a circle, wherein both the first magnetic core and the second magnetic core include a magnetic column, and the cross-sectional area of the magnetic column of the first magnetic core is larger than that of the second magnetic column. The cross-sectional area of the magnetic pillar of the core.
15. The driving device according to claim 14, 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 .
16. 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 is located outside the driving housing, and the rotating shaft is opposite to the The drive housing can rotate, the magnetic assembly is housed in the drive housing, 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 magnetic assembly also includes a flywheel fixed to the rotating shaft, the flywheel includes a disc-shaped part and a tubular part, and the tubular part is fixedly passed through the middle of the disc-shaped part and connected to the disc-shaped part coaxial, one end of the rotating shaft is fixedly accommodated in the tubular part, and the first magnet and the second magnet are respectively arranged on opposite sides of the disc part.
17. The driving device according to claim 16, characterized in that, a dispensing groove is provided at the end of the one end of the rotating shaft accommodated in the tubular part, and a dispensing groove is provided on the inner wall of the tubular part to abut against the dispensing groove. The stop protrusion.
18. The driving device according to claim 1, wherein the rotor includes a rotating shaft and a magnetic assembly fixed to the rotating shaft, and the magnetic assembly is located in the driving housing;

    The driving case also has a separated compartment, and the driving device further includes electric wires, the electric wires are connected to the stator mechanism, and part of the electric wires is located between at least part of the magnetic assembly and the driving case. and the part of the electric wire located between the magnetic component and the driving case is accommodated in the separation cavity.
19. The driving device according to claim 18, wherein a protective member is fixed inside the driving housing, and the protective member and the driving housing jointly define the partition cavity; or,

    The separation cavity is a channel opened on the side wall of the drive housing for passing the electric wires.
20. A blood pump, characterized in that it includes a driving device and an impeller, and the driving device includes:

    The driving shell has a communication port, and a limiting part is also arranged in the driving shell;

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

    A stator mechanism, accommodated in the drive housing, capable of generating a rotating magnetic field that drives the rotor to rotate;

    The bushing assembly includes a support, a spacer and a limiter, the support, the spacer and the limiter are sequentially arranged on the drive housing along the rotation axis of the rotor, and the spacers are respectively abut against the support member and the limiting member, and the side of the support member away from the partition abuts against the limiting part, wherein the rotor passes through the support member and the limiting member. The limiting member, the communication port can pass through the support member, the partition and the limiting member;

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