CN115006715A

CN115006715A - Drive device and blood pump

Info

Publication number: CN115006715A
Application number: CN202210654851.2A
Authority: CN
Inventors: 谢端卿; 余顺周
Original assignee: Shenzhen Core Medical Technology Co Ltd
Current assignee: Shenzhen Core Medical Technology Co Ltd
Priority date: 2022-06-10
Filing date: 2022-06-10
Publication date: 2022-09-06

Abstract

The invention relates to a drive device and a blood pump. The driving device comprises a pump shell, a stator, a rotating shaft, a rotor, a lead and a cover body; the pump shell is provided with an accommodating cavity, a first wire passing hole and a second wire passing hole, and the first wire passing hole and the second wire passing hole are communicated with the accommodating cavity; the stator and the rotor are accommodated in the accommodating cavity, the rotor is fixedly connected with the rotating shaft, the stator can drive the rotor to rotate, and the rotor can drive the rotating shaft to rotate; the lead is connected with the stator, the lead is provided with an isolation section corresponding to the position of the rotor, the lead penetrates through the first wire passing hole and the second wire passing hole, the isolation section is positioned between the first wire passing hole and the second wire passing hole, and the isolation section is positioned outside the accommodating cavity; the cover body completely covers the first wire passing hole, the second wire passing hole and the isolation section, the pump shell is provided with a connecting position used for being connected with the cover body, the connecting position surrounds the first wire passing hole, the second wire passing hole and the isolation section, and the first wire passing hole, the second wire passing hole and the isolation section are all separated from the connecting position by a distance. The drive device and the blood pump have low failure rate.

Description

Drive device and blood pump

Technical Field

The invention relates to the technical field of medical instruments, in particular to a driving device and a blood pump.

Background

An intravascular blood pump is a blood pumping device that may be accessed into a patient's heart via a patient's blood vessel, the intravascular blood pump being positioned within an opening of a heart valve so that blood can flow through the blood pump and into the arterial vessel. However, the conventional blood pump has low yield and high failure rate.

Disclosure of Invention

The invention solves the technical problem of how to improve the yield of the blood pump and reduce the failure rate of the blood pump.

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

the pump shell is provided with an accommodating cavity, a first wire passing hole and a second wire passing hole are arranged on the wall of the pump shell at intervals, and the first wire passing hole and the second wire passing hole are communicated with the accommodating cavity;

the stator is accommodated in the accommodating cavity;

the rotating shaft is used for being connected with the impeller, can be rotatably arranged on the pump shell, and is partially accommodated in the accommodating cavity;

the rotor is accommodated in the accommodating cavity and is fixedly connected with the rotating shaft; the stator can drive the rotor to rotate, and the rotor can drive the rotating shaft to rotate;

the lead is connected with the stator and provided with an isolation section corresponding to the position of the rotor, and the lead is arranged in the first wire passing hole and the second wire passing hole in a penetrating way, wherein the isolation section is positioned between the first wire passing hole and the second wire passing hole, and the isolation section is positioned outside the accommodating cavity; and

the cover body is connected with the pump shell, the cover body completely covers the first wire passing hole, the second wire passing hole and the isolation section, the pump shell is provided with a connecting position used for being connected with the cover body, the connecting position surrounds the first wire passing hole, the second wire passing hole and the isolation section, and the first wire passing hole, the second wire passing hole and the isolation section are all separated from the connecting position by a distance.

In one embodiment, the outer side surface of the pump casing is recessed to form a sunken groove, the sunken groove is provided with a bottom wall and an opening opposite to the bottom wall, the cover body is at least partially accommodated in the sunken groove, the connecting position surrounds the opening of the sunken groove for a circle, the first wire passing hole and the second wire passing hole are both formed in the bottom wall of the sunken groove and are spaced from the edge of the bottom wall by a certain distance, and the isolating section is located between the bottom wall of the sunken groove and the cover body.

In one embodiment, an edge of the cover abuts an edge of the bottom wall of the sink.

In one embodiment, the sinking groove is further provided with a side wall which surrounds the bottom wall of the sinking groove for one circle, and the side wall is perpendicular to the bottom wall, or an included angle which is larger than 90 degrees and smaller than 180 degrees is formed between the side wall and the bottom wall.

In one embodiment, the pump casing includes a first casing and a second casing connected to the first casing, the second casing is butted with the first casing to jointly enclose the accommodating cavity, one part of the sinking groove is located on the second casing, the other part of the sinking groove is located on the first casing, and the second wire passing hole is located on the second casing, wherein:

a notch is formed in the end part, close to the other end, of at least one of the second shell and the first shell, and the notch is at least one part of the first wire passing hole;

or the first wire passing hole is formed in the second shell or the first shell.

In one embodiment, a step portion is arranged on the inner wall of the second shell close to the first shell, the first shell comprises a first section and a second section which are coaxially arranged, the outer diameter of the first section is smaller than that of the second section, the first section is inserted into the second shell, the end surface of one end of the first section, which is far away from the second section, is abutted against the step portion of the second shell, and the second section is located outside the second shell; wherein a portion of the bottom wall of the sink is located on the first section and another portion is located on the second housing.

In one embodiment, a side of the cover facing away from the bottom wall of the sink is flush with an outer side surface of the pump casing.

In one embodiment, the first wire passing hole and the second wire passing hole are arranged at intervals along the extending direction of the rotating shaft, the hole wall of one side, close to the other side, of at least one of the first wire passing hole and the second wire passing hole is an arc-shaped wall, and the arc-shaped wall is a concave wall.

In one embodiment, the first wire passing hole and the second wire passing hole are arranged at intervals along the extending direction of the rotating shaft, and the width of the first wire passing hole is smaller than that of the second wire passing hole in the direction perpendicular to the extending direction of the rotating shaft.

In one embodiment, the middle of the rotating shaft can be rotatably inserted into the stator, one end of the rotating shaft is used for being connected with the impeller, the rotor is fixedly connected to the other end of the rotating shaft, the rotor has magnetism, and the stator can generate a rotating magnetic field for driving the rotor to rotate.

In one embodiment, the rotating shaft has a connecting end for connecting with the impeller, the rotor includes a first magnet and a second magnet, the first magnet and the second magnet are both fixedly connected to the rotating shaft, the stator includes a first stator unit and a second stator unit arranged along the extending direction of the rotating shaft, the first stator unit can generate a rotating magnetic field for driving the first magnet to rotate, and the second stator unit can generate a rotating magnetic field for driving the second magnet to rotate; in the extending direction of the rotating shaft, the first magnet, the first stator unit, the second stator unit and the second magnet are sequentially arranged along the extending direction of the rotating shaft, and the first magnet is close to the connecting end of the rotating shaft; at least one of the first stator unit and the second stator unit is connected to the wire, and the isolation section corresponds to a position of the second magnet.

In one embodiment, the rotating shaft is provided with a connecting end used for being connected with the impeller, the stator comprises a first stator unit and a second stator unit which are arranged along the extending direction of the rotating shaft, and the first stator unit and the second stator unit can drive the rotor to rotate; the rotor is positioned on the first stator unit and the second stator unit in the extending direction of the rotating shaft; the first stator unit is located between the connecting end of the rotating shaft and the rotor, and the conducting wire is connected with the first stator unit.

In one embodiment, the rotor includes a first magnet, a second magnet and a flywheel, the first magnet and the second magnet are mounted on the flywheel, and the flywheel is fixed to the rotating shaft; in the extending direction of the rotating shaft, the flywheel is positioned between the first stator unit and the second stator unit; the first stator unit can generate a rotating magnetic field for driving the first magnet to rotate, and the second stator unit can generate a rotating magnetic field for driving the second magnet to rotate.

In one embodiment, the rotating shaft has a connecting end for connecting with the impeller, the rotor includes a first magnet and a second magnet, both of which are fixedly connected to the rotating shaft, the stator includes a first stator unit and a second stator unit arranged along the extending direction of the rotating shaft, the first stator unit is capable of generating a rotating magnetic field for driving the first magnet to rotate, and the second stator unit is capable of generating a rotating magnetic field for driving the second magnet to rotate; the first magnet, the first stator unit, the second magnet and the second stator unit are sequentially arranged along the extension direction of the rotating shaft, and the first magnet is close to the connecting end of the rotating shaft; the conducting wire is connected with the first stator unit, and the isolation section corresponds to the position of the second magnet.

In one embodiment, the rotating shaft is rotatably arranged through the first stator unit, and one end of the rotating shaft, which is far away from the connecting end, is spaced from the second stator unit in the extending direction of the rotating shaft; the first stator unit and the second stator unit are provided with magnetic cores, each magnetic core comprises a magnetic column, and the cross-sectional area of the magnetic column of the second stator unit is larger than that of the magnetic column of the first stator unit.

In one embodiment, the cover body is welded to the connection position.

A blood pump comprises an impeller and the driving device, wherein the impeller is connected to a rotating shaft and can rotate along with the rotating shaft.

The driving device and the blood pump have at least the following advantages:

the lead is arranged in the first wire passing hole and the second wire passing hole in a penetrating manner, so that the isolation section of the lead corresponding to the position of the rotor is arranged outside the accommodating cavity and is isolated from the rotor, thereby effectively avoiding the faults of lead fracture or falling off and the like caused by the lead rotating along with the rotor when the rotor contacts the lead in the rotating process, and reducing the fault rate of the driving device; the cover body is arranged to completely cover the first wire passing hole, the second wire passing hole and the isolation section of the wire, so that foreign objects (such as blood and the like) are prevented from entering the accommodating cavity from the first wire passing hole and the second wire passing hole, and the isolation section of the wire is prevented from being exposed; the first wire passing hole, the second wire passing hole and the isolation section of the lead are spaced from the connecting position by a certain distance, so that the connecting position between the lead and the pump shell for connecting the lead and the cover body is kept at a certain distance, and the lead is prevented from being damaged by heat generated in the process of connecting the cover body to the pump shell, such as the insulating layer of the lead is damaged by high temperature (if the insulating layer of the lead is damaged, a short circuit fault is caused); meanwhile, the first wire passing hole and the second wire passing hole are spaced from the connecting position by a certain distance, and heat generated in the process of mounting the cover body on the pump shell can be reduced to enter the accommodating cavity from the first wire passing hole and the second wire passing hole, so that the influence of the heat on the performance of internal elements of the accommodating cavity during mounting of the cover body is reduced, and therefore the driving device and the blood pump have high yield and reduced failure rate.

Drawings

Fig. 1 is a schematic perspective view of a blood pump according to an embodiment;

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

FIG. 3 is a schematic cross-sectional view of FIG. 2 in a first orientation;

FIG. 4 is a schematic cross-sectional view of FIG. 2 in a second orientation;

fig. 5 is a schematic perspective view of a first stator unit in the drive device of the blood pump shown in fig. 1;

FIG. 6 is a schematic view of another angle of the first stator unit shown in FIG. 5;

FIG. 7 is a schematic structural view of a rotor in the drive of the blood pump shown in FIG. 1;

FIG. 8 is a cross-sectional view of the rotor shown in FIG. 7;

FIG. 9 is an exploded view of the rotor shown in FIG. 7;

FIG. 10 is an exploded perspective view of the sleeve assembly of FIG. 2, completely omitted;

FIG. 11 is another exploded perspective view of the cannula assembly of FIG. 2, with the cannula assembly completely omitted;

FIG. 12 is another exploded perspective view of the cannula assembly of FIG. 2, with the cannula assembly completely omitted;

FIG. 13 is a cross-sectional view of a pump housing of the drive device of the blood pump of FIG. 1;

fig. 14 is an exploded view of a pump housing of a drive device of the blood pump of fig. 1;

FIG. 15 is a schematic structural view of a second casing of the pump casing of FIG. 14;

FIG. 16 is a perspective view of a first hub of the hub assembly of the blood pump of FIG. 3;

FIG. 17 is a perspective view of a second hub of the hub assembly of the blood pump of FIG. 3;

FIG. 18 is a cross-sectional view of a hub assembly of the blood pump of FIG. 3;

fig. 19 is an enlarged view of section a of the blood pump shown in fig. 4.

Detailed Description

To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "inner", "outer", "left", "right" and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Herein, "proximal end" is defined as the end near the operator; "distal end" is defined as the end remote from the operator.

Referring to fig. 1 and fig. 2, a blood pump 10 according to an embodiment of the present invention includes a cannula assembly 100, an impeller 200, a conduit 300, and a driving device 400, wherein the cannula assembly 100 is connected to one end of the driving device 400, the conduit 300 is connected to the other end of the driving device 400, the impeller 200 is rotatably disposed in the cannula assembly 100, the impeller 200 is connected to the driving device 400, and the driving device 400 is capable of driving the impeller 200 to rotate, so as to implement a blood pumping function of the blood pump 10.

Specifically, cannula assembly 100 has an inlet 110 and an outlet 120. Wherein the outlet 120 is closer to the driving device 400 than the inlet 110. In one embodiment, the cannula assembly 100 extends through a heart valve, such as an aortic valve, with the inlet 110 located inside the heart and the outlet 120 and the actuating device 400 located in a vessel, such as the aorta, outside the heart. As impeller 200 rotates, blood flows into cannula assembly 100 from inlet 110 and out of cannula assembly 100 from outlet 120.

In the illustrated embodiment, the cannula assembly 100 comprises a first cannula 130 and a second cannula 140 connected to the first cannula 130, wherein an end of the first cannula 130 remote from the second cannula 140 is connected to the driving device 400, the inlet 110 is arranged on the second cannula 140, and the outlet 120 is arranged on the first cannula 130.

The position of the impeller 200 generally corresponds to the position of the outlet 120. Specifically, the impeller 200 is located within the first sleeve 130.

Catheter 300 is mated to the end of drive device 400 distal to cannula assembly 100. The conduit 300 is adapted to receive various supply lines, such as a cleaning line for introducing cleaning fluid into the drive unit 400, a lead for supplying power to the drive unit 400, a support member for supporting the conduit 300, and the like.

Referring to fig. 3 to 4, the driving apparatus 400 includes a pump housing 410, a rotating shaft 420, a stator 430, a rotor 440, and a conductive wire 450. Wherein, the rotation shaft 420 is rotatably installed at the pump case 410; stator 430 and rotor 440 are housed in pump case 410; the rotor 440 is fixedly connected with the rotating shaft 420; at least a portion of the lead 450 is received in the pump housing 410, and the lead 450 is connected to the stator 430 to supply power to the stator 430. The stator 430 can drive the rotor 440 to rotate, the rotor 440 can drive the rotating shaft 420 to rotate, and the impeller 200 can rotate along with the rotating shaft 420.

In some embodiments, pump housing 410 is substantially cylindrical with a circular cross-section. The pump housing 410 has a receiving cavity 412.

One end of the rotating shaft 420 is accommodated in the accommodating cavity 412, and the other end extends out of the pump housing 410 and is fixedly connected with the impeller 200. The rotational shaft 420 extends in the same direction as the axial direction of the pump case 410. One end of the rotating shaft 420 for connecting with the impeller 200 is a connecting end 421. The rotating shaft 420 may be made of ceramic or stainless steel, for example, the ceramic is Alumina Toughened Zirconia (ATZ) ceramic, and the stainless steel is SUS316L, so as to increase the torsional strength of the rotating shaft 420 and prevent the rotating shaft 420 from being broken due to excessive torque.

The stator 430 is received in the receiving cavity 412. In the illustrated embodiment, the stator 430 includes a first stator unit 432 and a second stator unit 433, and each of the first stator unit 432 and the second stator unit 433 is capable of driving the rotor 440 to rotate. Specifically, the first stator unit 432 and the second stator unit 433 are disposed at intervals in the extending direction of the rotating shaft 420. The first stator unit 432 and the second stator unit 433 are both fixedly connected with the pump shell 410. The rotating shaft 420 is rotatably disposed through the first stator unit 432. That is, the rotating shaft 420 is rotatable with respect to the pump housing 410, and the first stator unit 432 and the second stator unit 433 are not rotatable with respect to the pump housing 410.

The first stator unit 432 and the second stator unit 433 may be connected in parallel or in series. In some embodiments, the first stator unit 432 and the second stator unit 433 can synchronously drive the rotor 440 to rotate. The first stator unit 432 and the second stator unit 433 can jointly drive the rotor 440 to rotate, or can separately drive the rotor 440 to rotate.

In some embodiments, the rotor 440 is magnetic and the stator 430 is capable of generating a rotating magnetic field that drives the rotor 440 to rotate. Specifically, the first stator unit 432 and the second stator unit 433 are each capable of generating a rotating magnetic field that drives the rotor 440 to rotate.

Specifically, the first stator unit 432 includes a first magnetic core 4321, a first coil 4322, and a first back plate 4323. The first back plate 4323 is fixedly connected to the pump housing 410. The first magnetic cores 4321 are multiple, and the multiple first magnetic cores 4321 are arranged at intervals along a circumference. Specifically, the extending direction of each first core 4321 coincides with the extending direction of the rotation shaft 420. Each first magnetic core 4321 is fixedly connected to the first back plate 4323. First coil 4322 is wound around first magnetic core 4321. In the illustrated embodiment, each first magnetic core 4321 has a first coil 4322 wound thereon.

The second stator unit 433 has a structure similar to that of the first stator unit 432. The second stator unit 433 includes a second magnetic core 4331, a second coil 4332, and a second back plate 4333. The second back plate 4333 is fixed to the pump housing 410. The second magnetic cores 4331 are multiple, and the multiple second magnetic cores 4331 are arranged at intervals along a circumference. Specifically, each of the second cores 4331 extends in a direction parallel to the axis of the rotating shaft 420. Each second magnetic core 4331 is fixedly connected to the second back plate 4333. The second coil 4332 is wound around the second magnetic core 4331. In the illustrated embodiment, each second magnetic core 4331 is wound with a second coil 4332.

In some embodiments, each of the first magnetic core 4321 and the second magnetic core 4331 includes a magnetic pillar and a head (i.e., a pole shoe) disposed at one end of the magnetic pillar, and the magnetic pillar extends in a direction consistent with the direction of the rotation shaft. The first back plate 4323 is engaged with an end of the magnetic pillar of the first magnetic core 4321 away from the head; the second back plate 4333 is coupled to an end of the magnetic pillar of the second magnetic core 4331 away from the head. In the extending direction of the magnetic pillar, the magnetic pillar is a pillar with a substantially uniform size, that is, the size of the cross section of the magnetic pillar 4331 is kept constant, and in general, the magnetic pillar 4331 has a uniform thickness. The first coil 4322 is wound around the magnetic pillar of the first magnetic core 4321, and the second coil 4332 is wound around the magnetic pillar of the second magnetic core 4331.

Referring to fig. 5 and 6, in the illustrated embodiment, each of the first and

second cores

4321 and 4331 includes only magnetic posts, i.e., each of the first and

second cores

4321 and 4331 does not have a head portion (i.e., pole piece) with a larger width. At this time, the entire first magnetic core 4321 and the entire second magnetic core 4331 can be magnetically coupled to the rotor 440, and compared to the magnetic core having the pole shoe, the magnetic core having only the magnetic pole can reduce the magnetic loss and increase the magnetic coupling density between the magnetic core and the rotor to increase the torque of the stator unit to the rotor under the same current. On the other hand, the magnetic cores without heads can greatly reduce the problem of power reduction of the driving device 400 caused by local magnetic short circuit generated by contact between adjacent magnetic cores.

It is understood that the first and second

magnetic cores

4321 and 4331 are not limited to the above two ways, and in some embodiments, one of the first and second

magnetic cores

4321 and 4331 may have both a magnetic pillar and a head portion, and the other may have only a magnetic pillar.

The cross-sectional shape of the magnetic columns of the first and second

magnetic cores

4321 and 4331 may be a sector, a circle, a trapezoid, a sector ring, or the like. In the illustrated embodiment, the magnetic pillars are generally triangular in shape, with one edge of each pillar facing the axis of the shaft. In some embodiments, the edges of the magnetic pillars are rounded, that is, the edges of the magnetic pillars are rounded edges which are relatively smooth and passivated, so that sharp edges and corners on the magnetic pillars are eliminated, winding of subsequent coils can be facilitated, and protection of insulating materials coated on the coils is facilitated.

In the illustrated embodiment, the rotating shaft 420 is spaced from the second stator unit 433 in the extending direction of the rotating shaft 420, that is, one end of the rotating shaft 420 far away from the impeller 200 is spaced from the second stator unit 433, that is, the rotating shaft 420 does not penetrate into the second stator unit 433, or, one end of the rotating shaft 420 far away from the connecting end 421 is spaced from the second stator unit 433 in the extending direction of the rotating shaft 420. Wherein, the cross-sectional area of the magnetic pillar of the second stator unit 433 is larger than that of the magnetic pillar of the first stator unit 432. In the illustrated embodiment, since the first magnetic core 4321 and the second magnetic core 4331 both include only magnetic pillars, the magnetic pillar of the first stator unit 432 is the first magnetic core 4321, and the magnetic pillar of the second stator unit 433 is the second magnetic core 4331.

The larger the cross-sectional area of the magnetic pole is, the larger the generated magnetic flux is, the larger the torque of the stator unit to the rotor 440 is, and the smaller the required current is, which is beneficial to reducing power consumption and reducing heat generation. Under the condition that the cross section sizes of the first stator unit 432 and the second stator unit 433 are the same, and the outer diameter of the pump shell 410 is kept unchanged, considering that the rotating shaft 420 is positioned outside the second stator unit 433, the rotating shaft 420 is not arranged in the second stator unit 433 in a penetrating way, the cross section size of the magnetic column of the second stator unit 433 can be reasonably increased in a way of not increasing the outer diameter of the pump shell 410, so that the driving torque of the second stator unit 433 to the rotor 440 can be increased, under the condition that the required torques are the same, the current supply to the stator coils can be reasonably reduced in the way, so that the power consumption is reduced, meanwhile, the heat productivity of the driving device 400 is also reduced, and the phenomenon that the temperature is too high to cause discomfort or even injury to a human body due to heat accumulation in the working process of the blood pump is avoided.

It should be noted that, in other embodiments, the rotating shaft 420 may also penetrate into the second stator unit 433, and at this time, the cross-sectional areas of the magnetic columns of the first stator unit 432 and the second stator unit 433 are the same.

The first back plate 4323 and the second back plate 4333 have a substantially flat plate-like structure. The first back plate 4323 and the second back plate 4333 are made of the same material as the first magnetic core 4321 and the second magnetic core 4331, for example, a soft magnetic material such as cobalt steel.

The back plate can function to close the magnetic circuit of the stator unit to promote and increase the generation of the magnetic flux of the stator unit, improving the coupling capability between the stator unit and the rotor 440. In other words, the arrangement of the first back plate 4323 in the first stator unit 432 can promote and increase the generation of the magnetic flux of the first stator unit 432, and improve the coupling capability between the first stator unit 432 and the rotor 440; the provision of the second back plate 4333 in the second stator unit 433 can facilitate and increase the generation of magnetic flux of the second stator unit 433, and improve the coupling capability between the second stator unit 433 and the rotor 440. Since the back plate can increase the magnetic flux, providing the back plate in the first stator unit 432 and the second stator unit 433, respectively, is also advantageous to reduce the overall diameter of the driving apparatus 400.

With reference to fig. 3 and fig. 4, the driving apparatus 400 further includes a positioning element 460, the positioning element 460 is fixedly connected in the pump housing 410, the positioning element 460 has a supporting surface 462 and a positioning pillar 464, one end of the positioning pillar 464 is fixed on the supporting surface 462, and the other end of the positioning pillar 464 protrudes a certain height relative to the supporting surface 462, that is, the positioning pillar 464 protrudes and is disposed on the supporting surface 462. The second back plate 4333 of the second stator unit 433 is provided with a positioning hole 4334, the positioning post 464 is inserted into the positioning hole 4334, and the second back plate 4333 abuts against the bearing surface 462. Therefore, the positioning member 460 can perform the positioning function of the second stator unit 433, and the mounting accuracy and the mounting efficiency of the second stator unit 433 are improved. Specifically, the central axis of the positioning column 464 and the central axis of the second stator unit 433 coincide with each other.

The positioning member 460 further has a through hole 466, and the through hole 466 may be used for communicating with a cleaning line for introducing a cleaning liquid into the driving device 400 or for installing the cleaning line.

It should be noted that, in some embodiments, the first stator unit 432 may not have the first back plate 4323, and the second stator unit 433 may not have the second back plate 4333, or one of the first stator unit 432 and the second stator unit 433 may have a back plate, and the other does not have a back plate. If the second stator unit 433 does not have the second back plate 4333, a plurality of positioning holes can be directly formed on the positioning member 460, and one end of each of the plurality of second magnetic cores 4331 is positioned in each of the plurality of positioning holes.

In some embodiments, the positioning element 460 may be omitted, and in this case, a detent for engaging with an edge of the second back plate 4333 may be provided in the pump housing 410, so that the second stator unit 433 is fixed by the detent engaging with the second back plate 4333; or the second stator unit 433 is adhesively fixed to the pump case 410 by an adhesive. The first stator unit 432 may be fixed to the pump case 410 by an adhesive, or the first stator unit 432 may be fixed by providing a corresponding detent in the pump case 410 to engage with the first back plate 4323.

Rotor 440 is received in receiving chamber 412 of pump casing 410. Specifically, the rotor 440 includes a first magnet 442 and a second magnet 443, the first magnet 442 and the second magnet 443 are both fixed to the rotating shaft 420, the second magnet 443 is located between the first stator unit 432 and the second stator unit 433, the first stator unit 432 is capable of generating a rotating magnetic field for driving the first magnet 442 to rotate, and the second stator unit 433 is capable of generating a rotating magnetic field for driving the second magnet 443 to rotate. The two stator units provide torque to the rotor 440 through the two magnets, respectively, and may increase a driving force for rotating the rotor 440.

In the illustrated embodiment, the first magnet 442 and the second magnet 443 are both located between the first stator unit 432 and the second stator unit 433, that is, along the extending direction of the rotating shaft 420, and the first stator unit 432, the first magnet 442, the second magnet 443, and the second stator unit 433 are arranged in sequence.

Specifically, the rotor 440 further includes a flywheel 444, the flywheel 444 is fixedly connected to the rotating shaft 420, the flywheel 444 is located between the first stator unit 432 and the second stator unit 433, and the first magnet 442 and the second magnet 443 are fixedly connected to the flywheel 444. More specifically, the flywheel 444 is fixedly connected to an end of the rotating shaft 420 far from the connecting end 421.

The strength of the connection between the first and

second magnets

442, 443 and the rotating shaft 420 can be enhanced by the provision of the flywheel 444; in addition, by disposing both the first magnet 442 and the second magnet 443 on the same flywheel 444, the wobbling of the rotating shaft 420 during rotation can be reduced, and the rotating shaft 420 can be more stable during rotation.

Referring to fig. 7-9, in the illustrated embodiment, the freewheel 444 includes an inner tube 4442, a disk 4444, and an outer annular wall 4446. Both the inner tube 4442 and the outer annular wall 4446 are of circular tubular construction, with the disk 4444 being of annular disc construction. Both the inner tube 4442 and the outer annular wall 4446 are fixedly connected to the disk 4444. The outer annular wall 4446 is disposed around the disc 4444, the inner tube 4442 and the outer annular wall 4446 are disposed coaxially, and the shaft 420 is disposed through the inner tube 4442 and fixedly connected to the inner tube 4442. An accommodation space is formed between the inner tube 4442 and the outer annular wall 4446, and the disc 4444 divides the accommodation space into two installation cavities 4448. Both mounting cavities 4448 are annular cavities. The first and

second magnets

442, 443 are received in the two mounting cavities 4448, respectively. The first magnet 442 and the second magnet 443 are both ring-shaped, and the two mounting cavities 4448 are shaped to fit the first magnet 442 and the second magnet 443, respectively, to facilitate mounting and positioning of the first magnet 442 and the second magnet 443. This arrangement enables the flywheel 444 to serve as a stopper for the first and

second magnets

442, 443, which not only facilitates the installation of the first and

second magnets

442, 443, but also makes the combination of the first and

second magnets

442, 443 and the flywheel 444 more stable.

It should be noted that the flywheel 444 is not limited to the above-described structure, and in some embodiments, the flywheel 444 does not have the outer annular wall 4446; in some embodiments, the freewheel 444 does not have an outer annular wall 4446 and an inner tube 4442, where the shaft 420 is fixedly disposed through a disk 4444, e.g., the center of the disk 4444. The provision of the inner tube 4442 enables the flywheel 444 to be more stably connected to the rotary shaft 420 than the flywheel 444 having only the disk 4444.

In some embodiments, the first magnet 442 and the second magnet 443 are both annular halbach array magnets. Specifically, each of the first and

second magnets

442 and 443 includes a plurality of magnetic bodies, for example, four, six, eight, or ten magnetic bodies, each of which has a fan-shaped ring shape, the plurality of magnetic bodies of the first magnet being arranged around the rotating shaft 420 for one turn to form a ring-shaped structure, and the plurality of magnetic bodies of the second magnet 443 being arranged around the rotating shaft 420 for one turn to form a ring-shaped structure.

More specifically, the first magnet 442 has a first magnetic body 4422 magnetized in the axial direction of the first magnet 442, the second magnet 443 has a second magnetic body 4432 magnetized in the axial direction of the second magnet 443, the first magnetic body 4422 and the second magnetic body 4432 are respectively provided on both sides of the disk portion 4444 facing away from each other, and the positions of the first magnetic body 4422 and the second magnetic body 4432 are opposite; in the extending direction of the rotation shaft 420, the polarities of the first magnetic substance 4422 and the second magnetic substance 4432 on the sides facing the disk 4444 are opposite. This arrangement facilitates the mounting of the first and second

magnetic bodies

442 and 443, and prevents the first and second

magnetic bodies

4422 and 4432 of the first and second

magnetic bodies

442 and 443, which correspond to each other at the position of the disk 4444, from repelling each other, thereby preventing the difficulty in assembly. For example, the polarity of the first magnetic body 4422 facing the disk 4444 is an N-pole, and the polarity of the second magnetic body 4432 facing the disk 4444 is an S-pole, so that the interference of the magnetic repulsive force is eliminated and the installation efficiency of the first magnet 442 and the second magnet 443 is improved according to the principle that the N-pole and the S-pole attract each other.

In order to facilitate the mounting of the first and

second magnets

442 and 443 and improve the mounting accuracy of the first and

second magnets

442 and 443, the flywheel 444 is further provided with an identifier 445 for determining the mounting position of the first magnetic body 4422 and the mounting position of the second magnetic body 4432. The marking 445 may be provided as a groove, a graduation mark, a logo, or the like. When the first and

second magnets

442 and 443 are mounted, as long as the position of one of the magnetic bodies of the first and

second magnets

442 and 443 is identified using the identification part 445, the mounting position of the remaining magnetic bodies can be determined, thereby facilitating the mounting of the first and

second magnets

442 and 443. Specifically, the marking 445 is provided on at least one of the inner tube 4442, the disk 4444, and the outer annular wall 4446. Specifically, in the illustrated embodiment, the marking 445 is provided on the end surface of each end of the inner tube 4442.

Referring to fig. 4 and 10-12, in the illustrated embodiment, one end of the conducting wire 450 is connected to the first stator unit 432, and the other end is connected to the second stator unit 433. In some embodiments, both ends of the wire 450 are electrically connected to the first coil 4322 of the first stator unit 432 and the second coil 4223 of the second stator unit 433, respectively. It is understood that the connection manner of the first stator unit 432 and the second stator unit 433 is not limited to the above manner, and in some embodiments, one end of the wire 450 far away from the first stator unit 432 extends from the pump housing 410 into the catheter 300 to be connected with an external power supply; the second stator unit 433 is connected to an external power supply device through other wires.

Because the rotor 440 is disposed between the first stator unit 432 and the second stator unit 433, regardless of the manner in which the two ends of the conducting wire 450 are respectively connected to the first stator unit 432 and the second stator unit 433, or the manner in which one end of the conducting wire 450 is connected to the first stator unit 432 and the other end of the conducting wire 450 extends from the pump housing 410 into the guide duct 300, the conducting wire 450 has a section corresponding to the position of the rotor 440, and the portion of the conducting wire 450 corresponding to the position of the rotor 440 is defined as an isolation section 452, and if the rotor 440 contacts the isolation section 452 during rotation, there is a risk that the isolation section 452 rotates with the rotor 440 to cause a failure such as a breakage or a drop of the conducting wire 450.

Therefore, in this embodiment, the shell wall of the pump housing 410 is further provided with a first wire passing hole 413 and a second wire passing hole 414 which are spaced apart from each other, and both the first wire passing hole 413 and the second wire passing hole 414 are communicated with the accommodating cavity 412. The conducting wire 450 is inserted into the first threading hole 413 and the second threading hole 414, the isolation section 452 is located between the first threading hole 413 and the second threading hole 414, and the isolation section 452 is located outside the accommodating cavity 412. That is, because the rotor 440 is located in the accommodating cavity 412, and the rotor 440 and the isolation section 452 of the lead 450 are respectively located at two sides of the casing wall of the pump casing 410 between the first line passing hole 413 and the second line passing hole 414, so as to be arranged, the isolation section 452 of the lead 450 can be isolated from the rotor 440, thereby effectively avoiding the lead 450 from contacting the lead 450 during the rotation process of the rotor 440, and further avoiding the faults that the lead 450 is broken or falls off along with the rotation of the rotor 440, and further ensuring the normal use of the blood pump 10.

In order to prevent foreign objects (such as blood, etc.) from entering the accommodating cavity 412 through the first and second

wire passing holes

413 and 414 and to prevent the isolation section 452 of the lead 450 from being exposed, the driving device 400 further includes a cover 470, wherein the cover 470 is connected to the pump housing 410, and the cover 470 completely covers the first and second

wire passing holes

413 and 414 and the isolation section 452 of the lead 450. The pump casing 410 has a connection portion 415 for connecting with the cover 470, and the connection portion 415 surrounds the first wire hole 413, the second wire hole 414 and the isolation section 452. In other words, the connection 415 encloses a region on the wall of the pump housing 410, and the first wire hole 413, the second wire hole 414, and the isolation section 452 are located in the region enclosed by the connection 415. In some embodiments, the cover 470 and the attachment location 415 are attached by welding.

In order to prevent the heat generated during the process of mounting the cover 470 on the pump housing 410 from damaging the portions of the conductive wires 450 located at the first wire passing hole 413 and the second wire passing hole 414 and the isolation section 452 located outside the accommodating cavity 412, the first wire passing hole 413, the second wire passing hole 414 and the isolation section 452 of the conductive wires 450 are spaced apart from the connection position 415, so that the conductive wires 450 and the connection position 415 of the pump housing 410 for connecting the cover 470 are kept at a certain distance, and the heat generated during the process of connecting the cover 470 to the pump housing 410 is prevented from damaging the conductive wires 450, for example, the insulating layer of the conductive wires 450 due to high temperature; meanwhile, the first wire passing hole 413 and the second wire passing hole 414 are both spaced from the connecting position 415 by a distance, so that heat generated in the process of mounting the cover 470 on the pump housing 410 can be reduced to enter the accommodating cavity 412 from the first wire passing hole 413 and the second wire passing hole 414, and accordingly, damage to elements in the accommodating cavity 412, such as damage to a coil insulating layer, and influence on magnetism of magnetic elements, caused by heat in the mounting process of the cover 470 are reduced, and accordingly, the yield can be improved and faults of the blood pump 10 are reduced.

Referring to fig. 13 and 14, in the illustrated embodiment, the outer side of the pump casing 410 is recessed to form a sink 416, and the sink 416 has a bottom wall 416a and an opening opposite to the bottom wall 416 a. The cover 470 is at least partially received in the slot 416, and the edge of the cover 470 is connected to the connection site 415. Wherein the cover 470 seals the opening of the sink 416. The connection 415 is disposed around the opening of the sink 416. Specifically, the connection location 415 is an opening edge of the sink 416. The first wire passing hole 413 and the second wire passing hole 414 are both opened on the bottom wall 416a of the sinking groove 416, and the first wire passing hole 413 and the second wire passing hole 414 are both spaced from the edge of the bottom wall 416a of the sinking groove 416 by a certain distance. Wherein the isolation section 452 of the conductive wire 450 is located between the bottom wall 416a of the sink 416 and the cover 470; the bottom wall 416a of the sink 416 is positioned between the rotor 440 and the isolated section 452 of the wire 450.

The isolation section 452 of the lead 450 is isolated by recessing the outer side surface of the pump casing 410 to form the sinking groove 416, and at least part of the cover 470 is accommodated in the sinking groove 416, so that the increase of the local outer diameter of the pump casing 410 due to the arrangement of the cover 470 can be reduced, even the local outer diameter of the pump casing 410 cannot be increased, the sinking groove 416 can play a role in limiting the cover 470, the installation of the cover 470 is facilitated, and the connection stability of the cover 470 and the pump casing 410 can be better ensured.

Specifically, the sink slot 416 further has a side wall 416c surrounding the bottom wall 416a, and the side wall 416c of the sink slot 416 is substantially perpendicular to the bottom wall 416a, or an included angle greater than 90 ° and less than 180 ° is formed between the side wall 416c of the sink slot 416 and the bottom wall 416 a.

In the illustrated embodiment, the first and second string through

holes

413 and 414 are spaced apart in the axial direction of the pump case 410. The first wire passing hole 413 is closer to the connection end 421 of the rotation shaft 420 than the second wire passing hole 414. The widths of the first and second string-passing

holes

413 and 414 are each smaller than the width of the bottom wall 416a of the sinker 416 in the circumferential direction of the pump case 410; in the axial direction of the pump case 410, the maximum distance between the sides of the first and second string-passing

holes

413 and 414 away from each other is smaller than the width of the bottom wall 416a of the depressed groove 416, so that the first and second string-passing

holes

413 and 414 are spaced apart from the boundary of the bottom wall 416a of the depressed groove 416. Thus, in the axial direction of the pump case 410, a distal separation portion 417a is formed between the first string passing hole 413 and the distal end boundary of the bottom wall 416a of the sink groove 416, and a proximal separation portion 417b is formed between the second string passing hole 414 and the proximal end boundary of the bottom wall 416a of the sink groove 416; in the circumferential direction of the pump housing 410, a first side isolation portion 417c and a second side isolation portion 417d are formed between both side boundaries of the first string-passing hole 413 and the bottom wall 416a of the recessed groove 416, a third side isolation portion 417e and a fourth side isolation portion 417f are formed between the second string-passing hole 414 and both side boundaries of the bottom wall 416a of the recessed groove 416, a barrier portion 417g is formed at a portion of the bottom wall 416a located between the first string-passing hole 413 and the second string-passing hole 414, and the distal end isolation portion 417a, the proximal end isolation portion 417b, the first side isolation portion 417c, the second side isolation portion 417d, the third side isolation portion 417e, the fourth side isolation portion 417f, and the barrier portion 417g are connected to the bottom wall 416a which jointly constitutes the recessed groove 416. Wherein the dam portion 417g is located between the isolated section 452 of the wire 450 and the rotor 440.

It should be noted that, in the present application, a side of the pump casing 410 close to the impeller 200 is defined as a distal end, and an end of the pump casing 410 away from the impeller 200 is defined as a proximal end. Correspondingly, the distal end of the bottom wall 416a of the sink 416 is defined by the side of the bottom wall 416a close to the impeller 200, and the proximal end of the bottom wall 416a of the sink 416 is defined by the side of the bottom wall 416a away from the impeller 200. The direction defining one revolution of the pump case 410 around the rotation shaft 420 is the circumferential direction of the pump case 410.

Referring to fig. 11-15, in particular, pump housing 410 includes a first housing 418 and a second housing 419 connected to first housing 418, second housing 419 interfacing with first housing 418 to collectively enclose receiving cavity 412. Wherein the first housing 418 is closer to the connection end 421 of the rotation shaft 420 than the second housing 419. The sink 416 is partially located on the second housing 419 and partially located on the first housing 418. The second wire passing hole 414 is located on the second housing 419, a notch 419a is formed on the second housing 419, and the notch 419a is at least a part of the first wire passing hole 413. By forming a notch in at least one of the first shell 418 and the second shell 419 and then forming the first wire passing hole 413 by the butt joint of the first shell 418 and the second shell 419, the lead 450 can be conveniently threaded into the first wire passing hole 413 during assembly, and particularly, the assembly efficiency can be improved for the first wire passing hole 413 with a smaller diameter. The first stator unit 432 is housed in the first case 418, and the second stator unit 433 and the rotor 440 are housed in the second case 419. In the illustrated embodiment, distal spacer portion 417a is located on first housing 418; proximal and first

side isolation portions

417b, 417c, 417d, 417e, 417f, and barrier portion 417g are located on second housing 419.

Specifically, a step portion 419b is arranged on an inner wall of the second housing 419 close to the first housing 418, the first housing 418 includes a first section 418a and a second section 418b which are coaxially arranged, an outer diameter of the first section 418a is smaller than an outer diameter of the second section 418b, the first section 418a is inserted into the second housing 419, an end surface of an end portion of the first section 418a far from the second section 418b abuts against the step portion 419b of the second housing 419, and the second section 418b is located outside the second housing 419. With this arrangement, when the mounting is performed, the first section 418a of the first housing 418 is inserted into the second housing 419, at least one of the second housing 419 and the first housing 418 may be rotated to adjust the mounting position, and the second section 418b of the first housing 418 is located outside the second housing 419 and abuts against an end of the second housing 419, so that the positioning and guiding functions of the second housing 419 on the first housing 418 can be fully exerted, and the assembly efficiency and the assembly accuracy between the two can be improved. Wherein a portion of the sink 416 is located on the first section 418a and another portion is located on the second housing 419. More specifically, distal spacer portion 417a is located on first segment 418 a.

It should be noted that pump housing 410 is not limited to being a separate body, and in some embodiments, pump housing 410 may be integrally formed. The first and/or second wire holes 413, 414 are also not limited in the above manner, and in some embodiments, the first wire hole 413 may be completely disposed on the first shell 418 or the second shell 419; in some embodiments, an end of the second housing 419 near the first housing 418 is also provided with a notch, the positions of the second housing 419 and the notch on the first housing 418 correspond, and the notch of the second housing 419 and the notch on the second housing 419 together form a first wire passing hole 413; in some embodiments, a notch is formed on an end of the first housing 418 close to an end of the second housing 419, the second housing 419 is not notched, and the second wire passing hole 414 is formed at the notch position after the first housing 418 and the second housing 419 are butted.

In the illustrated embodiment, the cover 470 is shaped and sized to fit into the sink 416. The outer side surface of cover 470 is flush with the outer side surface of pump casing 410 so that cover 470 is disposed without increasing the local outer diameter of pump casing 410. Specifically, cover 470 has a substantially arc-shaped plate shape, and the outer peripheral side surface of pump casing 410 and the outer surface of cover 470 are smoothly transitioned.

Specifically, the edge of the cover 470 abuts against the edge of the bottom wall 416a of the sink 416, so that the bottom wall 416a can support the cover 470 when the cover 470 is mounted, and the cover 470 can be mounted on the pump housing 410 conveniently. More specifically, the cover 470 abuts against the proximal isolation portion 417b, the distal isolation portion 417a, the first side isolation portion 417c, the second side isolation portion 417d, the third side isolation portion 417e, the fourth side isolation portion 417f, and the barrier portion 417g of the bottom wall 416a on both sides in the circumferential direction of the pump housing 410.

Specifically, the hole wall of the side of at least one of the first wire passing hole 413 and the second wire passing hole 414 close to the other is an arc-shaped wall, and the arc-shaped wall is a concave wall, so that the scratching probability of the insulating layer of the wire 450 caused by the hole walls of the first wire passing hole 413 and/or the second wire passing hole 414 can be reduced. In the illustrated embodiment, the hole wall 413a of the first via hole 413 on a side close to the second via hole 414 is an arc-shaped wall.

In the illustrated embodiment, the width of the first string through hole 413 is smaller than the width of the second string through hole 414 in the circumferential direction of the pump case 410. For the case of having a plurality of wires 450, the smaller first wire passing hole 413 can play a role in gathering and concentrating the isolated sections 452 of the plurality of wires 450, and the larger second wire passing hole 414 can facilitate the wires 450 to separately route into the accommodating cavity 412, so as to facilitate the routing of the wires 450 to be reasonably arranged.

In one embodiment, the casing wall of the pump casing 410 is provided with a limiting groove 416d, the limiting groove 416d is located at the outer side of the casing wall of the pump casing 410, and the limiting groove 416d is located between the first wire passing hole 413 and the second wire passing hole 414. In the illustrated embodiment, the stopper groove 416d is formed by partially recessing the surface of the bottom wall 416a (specifically, the barrier portion 417g) of the sink groove 416 facing the cover 470, and the width of the bottom wall 416a (specifically, the barrier portion 417g) of the sink groove 416 is larger than the width of the stopper groove 416d in the circumferential direction of the pump housing 410. Therefore, the width of the stopper groove 416 is also smaller than the width of the region surrounded by the connecting portion 415 in the circumferential direction of the pump case 410. In other words, the connection portion 415 is disposed around the first wire hole 413, the second wire hole 414 and the limiting groove 416 d; the cover 470 also completely covers the stopper groove 416 d. Wherein at least a portion of the isolated segment 452 of the conductive trace 450 is constrained to the retention slot 416 d. The limiting groove 416d has a limiting function on the isolated section 452 of the conductive wire 450, so that when the driving device 400 is assembled, particularly when the cover 470 is connected to the pump housing 410, the conductive wire 450 between the first wire passing hole 413 and the second wire passing hole 414 is limited, and the conductive wire 450 is prevented from being scattered or moved to cause inconvenience in installation of the cover 470, or when the cover 470 is installed, the conductive wire 450 between the first wire passing hole 413 and the second wire passing hole 414 is prevented from being moved to a connection position (i.e., a connection position 415) between the cover 470 and the pump housing 410, so that the isolated section 452 of the conductive wire 450 can be further ensured to be away from the connection position 415 of the pump housing 410, which is connected to the cover 470.

In the illustrated embodiment, the width of the limiting groove 416d is greater than the width of the first wire hole 413 and less than the width of the second wire hole 414 in the circumferential direction of the pump housing 410, so that the isolated section 452 of the conductive wire 450 can be collected in the limiting groove 416d, and the conductive wire 450 can be separated from the second wire hole 414 and enter the accommodating cavity 412.

Specifically, one end of the limiting groove 416d is communicated with the first wire passing hole 413, and the other end is communicated with the second wire passing hole 414, so that the hole wall of the first wire passing hole 413 on the side close to the limiting groove 416d is recessed compared with the surface of the bottom wall 416a facing the cover 470, and the hole wall of the second wire passing hole 414 on the side close to the limiting groove 416d is recessed compared with the surface of the bottom wall 416a facing the cover 470, thereby reducing the bending radians of the wire 450 at the first wire passing hole 413 and the second wire passing hole 414, and reducing the damage influence of the hole walls of the first wire passing hole 413 and the second wire passing hole 414 on the wire 450.

In the illustrated embodiment, the retainer groove 416d has a middle portion 416e with a large recess depth and two side portions 416f located on both sides of the middle portion 416e and having a small recess depth in the circumferential direction of the pump case 410, and the thickness of the casing wall of the pump case 410 in the middle portion 416e of the retainer groove 416d is smaller than the thickness of the casing wall of the pump case 410 in the two side portions 416f of the retainer groove 416 d. The recessed depth of each side portion 416f relative to the surface of the bottom wall 416a facing the cover 470 in the direction away from the middle portion 416e is gradually reduced, that is, the thickness of the casing wall of the pump casing 410 in each side portion 416f is gradually increased in the direction away from the middle portion 416e, which can facilitate the machining of the pump casing 410 and improve the yield of the pump casing 410. The walls of the side portions 416f of the retention slot 416d are curved to reduce damage to the wire 450.

Specifically, the width of the middle portion 416e of the limiting groove 416d is greater than or equal to the width of the isolation sections 452 of the plurality of leads 450 connected to the first stator unit, which are arranged in parallel in sequence, so as to reduce the depth of the limiting groove 416d as much as possible, so that the casing wall of the pump casing 410 can have a thickness at a position corresponding to the limiting groove 416d, so as to make the pump casing 410 have a greater strength as much as possible.

Referring to fig. 3 and 4, the driving device 400 further includes a shaft sleeve assembly 480, the shaft sleeve assembly 480 is fixed in the pump housing 410, the shaft sleeve assembly 480 is located between the first stator unit 432 and the impeller 200, and the rotating shaft 420 is rotatably disposed through the shaft sleeve assembly 480. Through setting up axle sleeve subassembly 480, can play radial limiting displacement to pivot 420, reduce pivot 420 and produce radial rocking at the rotation in-process, improve pivot 420 pivoted stationarity. The sleeve assembly 480 may be integrally formed or may be separately formed. In the illustrated embodiment, pump housing 410 also has a third housing 405, third housing 405 interfaces with an end of first housing 418 distal from second housing 419, and bushing assembly 410 is fixedly received within third housing 405.

In the illustrated embodiment, the shaft sleeve assembly 480 includes a first shaft sleeve 482 and a second shaft sleeve 484, the first shaft sleeve 482 and the second shaft sleeve 484 are both fixedly connected to the pump housing 410, the rotating shaft 420 is rotatably disposed through the first shaft sleeve 482 and the second shaft sleeve 484, and the first shaft sleeve 482 is closer to the impeller 200 than the second shaft sleeve 484.

Referring to fig. 16, the first sleeve 482 has a first through hole 4821 and a limiting hole 4823, the first through hole 4821 and the limiting hole 4823 are coaxially disposed and are connected to each other, and the aperture of the limiting hole 4823 is larger than that of the first through hole 4821, so that the first through hole 4821 and the limiting hole 4823 form a stepped hole. The first boss 482 has a first limit surface 4825 that defines part of the boundary of the limit hole 4823.

Referring also to FIG. 17, the second hub 484 includes a thick section 4841 and a thin section 4843, the thin section 4843 having a cross-section smaller than the thick section 4841, the thick section 4841 having an abutment surface 4845. The narrow section 4843 is protruded on the abutting surface 4845. The second bushing 484 has a second through hole 4846, and the second through hole 4846 extends from an end surface of the end of the thin section 4843 away from the abutting surface 4845 to a side of the thick section 4841 away from the abutting surface 4845, so that the second through hole 4846 penetrates through the thick section 4841 and the thin section 4843.

Referring to fig. 18, the thin section 4843 is inserted into the limiting hole 4823, and the abutting surface 4845 abuts against the first sleeve 482. The accuracy and efficiency of installation of the entire boss assembly 480 can be improved by the limit action of the abutting surface 4845 and the guide action of the narrow section 4843. The end surface of the end of the thin section 4843 away from the abutting surface 4845 is a second limiting surface 4847, and the second limiting surface 4847 is spaced from and opposite to the first limiting surface 4825. The hole wall of the limiting hole 4823, the first limiting surface 4825 and the second limiting surface 4847 together define a limiting cavity 486, and the first through hole 4821 and the second through hole 4846 are both communicated with the limiting cavity 486.

Referring to fig. 19, the shaft 420 includes a straight shaft portion 422 and a protruding ring portion 424, the protruding ring portion 424 is fixedly sleeved on the straight shaft portion 422, and an outer diameter of the protruding ring portion 424 is larger than a diameter of the straight shaft portion 422.

The straight shaft portion 422 penetrates through the first through hole 4821 and the second through hole 4846, the convex ring portion 424 is accommodated in the limiting cavity 486, the outer diameter of the convex ring portion 424 is larger than the aperture of the first through hole 4821, and the outer diameter of the convex ring portion 424 is larger than the aperture of the second through hole 4846. The straight shaft portion 422 can be rotatably disposed through the first stator unit 432, and the rotor 440 is fixedly connected to the straight shaft portion 422. The connection end 421 is one end of the straight shaft portion 422.

In the extending direction of the rotating shaft 420, the protruding ring portion 424 is located between the first limiting surface 4825 and the second limiting surface 4847. The convex ring portion 424 can abut against the first stopper surface 4825 and the second stopper surface 4847 to position the rotating shaft 420 in the axial direction of the pump casing 410, prevent the movement of the rotating shaft 420 in the axial direction of the pump casing 410 or define the movement range of the rotating shaft 420 in the axial direction of the pump casing 410. In some embodiments, the collar portion 424 is always in abutment with the first 4825 and second 4847 stop surfaces; in some embodiments, the distance between the first and second limiting

surfaces

4825, 4847 is slightly larger than the axial height of the protruding ring portion 424, so that the protruding ring portion 424 has a certain floating space between the first and second limiting

surfaces

4825, 4847 for flowing the cleaning fluid during the rotation of the rotating shaft 420.

A first gap for flowing the cleaning fluid is formed between the straight shaft portion 422 and the hole wall of the first through hole 4821, a second gap for flowing the cleaning fluid is formed between the straight shaft portion 422 and the hole wall of the second through hole 4846, and a third gap 487 for flowing the cleaning fluid is formed between the convex ring portion 424 and the cavity wall of the limit cavity 486. A first flow guide groove 4826 is formed by partially recessing the first limiting surface 4825, the first flow guide groove 4826 is communicated with the first through hole 4821, and the first flow guide groove 4826 is communicated with the limiting cavity 486; the second flow guide groove 4848 is formed by partially recessing the second limiting surface 4847, the second flow guide groove 4848 is communicated with the second through hole 4846, and the first flow guide groove 4826 is communicated with the limiting cavity 486. Thus, when the collar portion 424 abuts against the first stopper surface 4825 and/or the second stopper surface 4847, the first guide groove 4826 can communicate the first gap and the third gap 487, and the second guide groove 4848 can communicate the second gap and the third gap 487. The first aperture 4821 communicates with cannula assembly 100 and the second aperture 4846 communicates with receiving cavity 412 of pump housing 410.

When a cleaning liquid is introduced into an end of the blood pump 10 away from the cannula assembly 100, the cleaning liquid flows through the accommodating chamber 412, the second gap, the third gap 487 and the first gap in sequence, enters the cannula assembly 100, and flows out of the outlet 120 of the cannula assembly 100. This prevents blood in the cannula assembly 100 from entering the drive device 400, since the direction of flow of the cleaning fluid is opposite to the direction of flow of blood in the cannula assembly 100. And the injected cleaning liquid flows in the first gap, the second gap and the third gap 487, and also functions as a lubricant between the rotating shaft 420 and the bushing assembly 480, thereby reducing the rotational resistance of the rotating shaft 420.

Referring to fig. 19, a bearing protrusion 410a is further disposed in the pump casing 410, the bearing protrusion 410a is ring-shaped, and a side of the thick section 4841 of the second bushing 484 of the bushing assembly 480 away from the abutment surface 4845 abuts against the bearing protrusion 410 a. The bearing projection 410a serves to limit the entire boss assembly 480 in the axial direction of the pump case 410. Specifically, the bearing projection 410a is located on the third housing 405; the first back plate 4323 of the first stator unit 432 is fixedly connected to the third housing 405.

It should be noted that the driving device 400 is not limited to the above structure, and in some embodiments, the rotor 440 is still located between the first stator unit 432 and the second stator unit 433, the rotor 440 has two flywheels fixedly connected to the rotating shaft 420, and the first magnet 442 and the second magnet 443 are respectively mounted on the two flywheels;

in some embodiments, the rotor 440 may also include only the first and

second magnets

442, 443 without the flywheel 444, i.e., the rotor 440 is still located between the first and

second stator units

432, 433, in which case the first and

second magnets

442, 443 are directly and fixedly connected to the rotating shaft 420, in which case the position of the isolated section 452 of the conductor 450 corresponds to the positions of both the first and

second magnets

442, 443;

in some embodiments, the first magnet 442, the first stator unit 432, the second magnet 443, and the second stator unit 433 are sequentially arranged along the extending direction of the rotating shaft 420, the rotating shaft 420 may only penetrate through the first stator unit 432, the rotating shaft 420 may also penetrate through the first stator unit 432 and the second stator unit 433, the first magnet 442 is close to the connection end 421 of the rotating shaft 420, and at this time, the position of the isolation section 452 of the conducting wire 450 corresponds to the position of the second magnet 443;

in some embodiments, the first magnet 442, the first stator unit 432, the second stator unit 433, and the second magnet 443 are sequentially arranged along an extending direction of the rotating shaft 420, the rotating shaft 420 is rotatably disposed through the first stator unit 432 and the second stator unit 433, the first magnet 442 is close to the connection end 421 of the rotating shaft 420, at this time, the plurality of wires 450 are provided, a portion of the wires 450 is connected with the first stator unit 432, a portion of the wires 450 is connected with the second stator unit 433, each of the wires 450 has an isolation section 452, positions of the isolation sections 452 of the plurality of wires 450 correspond to positions of the second magnet 443, at this time, the plurality of wires 450 are disposed through the first threading hole 413 and the second threading hole 414, so that the isolation section 452 of each of the wires 450 is located outside the accommodating cavity 412; or, the first stator unit 432 and the second stator unit 433 are connected through other conducting wires, and the conducting wire 450 is connected with one of the first stator unit 432 and the second stator unit 433;

in some embodiments, the first stator unit 432, the first magnet 442, the second stator unit 433, and the second magnet 443 are sequentially arranged along the extending direction of the rotating shaft 420, and the first stator unit 432 is close to the connection end 421 of the rotating shaft 420, in this case, the pump housing 410 may be respectively provided with the first through hole 413 and the second through hole 414 at positions corresponding to the first magnet 442 and the second magnet 443 to isolate the isolation section 452 of the conductive wire 450.

In some embodiments, the rotor 440 has only one magnet, and in this case, the first stator unit 432 and the second stator unit 433 share one magnet, and the rotor 440 is still located between the first stator unit 432 and the second stator unit 433;

in some embodiments, the stator 420 has only one stator unit, and in this case, if the impeller 200, the stator 430, and the rotor 440 are sequentially arranged along the extending direction of the rotating shaft 420, the wire 450 is connected to the stator 430.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the invention, and these changes and modifications are all within the scope of the invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A drive device for driving the rotation of an impeller of a blood pump, the drive device comprising:

the pump shell is provided with an accommodating cavity, a first wire passing hole and a second wire passing hole which are separated are formed in the wall of the pump shell, and the first wire passing hole and the second wire passing hole are communicated with the accommodating cavity;

the stator is accommodated in the accommodating cavity;

the conducting wire is connected with the stator and provided with an isolation section corresponding to the position of the rotor, and the conducting wire penetrates through the first wire through hole and the second wire through hole, wherein the isolation section is positioned between the first wire through hole and the second wire through hole, and the isolation section is positioned outside the accommodating cavity; and

2. The driving device as claimed in claim 1, wherein the outer side of the pump casing is recessed to form a recessed groove, the recessed groove has a bottom wall and an opening opposite to the bottom wall, the cover is at least partially received in the recessed groove, the connecting portion is disposed around the opening of the recessed groove, the first wire passing hole and the second wire passing hole are both disposed on the bottom wall of the recessed groove, the first wire passing hole and the second wire passing hole are both spaced from an edge of the bottom wall by a distance, and the isolation section is located between the bottom wall of the recessed groove and the cover.

3. The drive of claim 2, wherein an edge of the cover abuts an edge of the bottom wall of the sink.

4. The driving device as claimed in claim 2, wherein the sinking groove further has a side wall disposed around the bottom wall of the sinking groove, and the side wall is perpendicular to the bottom wall, or an included angle greater than 90 ° and less than 180 ° is formed between the side wall and the bottom wall.

5. The driving device as claimed in claim 2, wherein the pump housing comprises a first housing and a second housing connected to the first housing, the second housing is butted against the first housing to jointly enclose the accommodating cavity, a part of the sinking groove is located on the second housing, another part of the sinking groove is located on the first housing, and the second wire passing hole is located on the second housing, wherein:

6. The driving device according to claim 5, wherein a stepped portion is provided on an inner wall of the second housing close to the first housing, the first housing includes a first section and a second section which are coaxially provided, an outer diameter of the first section is smaller than an outer diameter of the second section, the first section is inserted into the second housing, an end surface of one end of the first section, which is far away from the second section, abuts against the stepped portion of the second housing, and the second section is located outside the second housing; wherein a portion of the bottom wall of the sink is located on the first section and another portion is located on the second housing.

7. The drive of claim 2, wherein a side of the cover facing away from the bottom wall of the sink is flush with an outer side surface of the pump housing.

8. The driving device according to any one of claims 1 to 7, wherein the first wire passing hole and the second wire passing hole are provided at intervals along an extending direction of the rotating shaft, and a hole wall of a side of at least one of the first wire passing hole and the second wire passing hole, which is close to the other one, is an arc-shaped wall, and the arc-shaped wall is a concave wall.

9. The driving device as claimed in any one of claims 1 to 7, wherein the first wire through hole and the second wire through hole are spaced apart from each other along the extending direction of the rotating shaft, and the width of the first wire through hole is smaller than that of the second wire through hole in a direction perpendicular to the extending direction of the rotating shaft.

10. The driving device according to any one of claims 1 to 7, wherein a middle portion of the rotating shaft is rotatably inserted through the stator, one end of the rotating shaft is used for being connected with the impeller, the rotor is fixedly connected to the other end of the rotating shaft, the rotor has magnetism, and the stator can generate a rotating magnetic field for driving the rotor to rotate.

11. The driving device according to claim 1, wherein the rotating shaft has a connecting end for connecting with the impeller, the rotor includes a first magnet and a second magnet, the first magnet and the second magnet are both fixedly connected to the rotating shaft, the stator includes a first stator unit and a second stator unit arranged along an extending direction of the rotating shaft, the first stator unit is capable of generating a rotating magnetic field for driving the first magnet to rotate, and the second stator unit is capable of generating a rotating magnetic field for driving the second magnet to rotate; in the extending direction of the rotating shaft, the first magnet, the first stator unit, the second stator unit and the second magnet are sequentially arranged along the extending direction of the rotating shaft, and the first magnet is close to the connecting end of the rotating shaft; at least one of the first stator unit and the second stator unit is connected to the wire, and the isolation section corresponds to a position of the second magnet.

12. The driving device as claimed in claim 1, wherein the rotating shaft has a connecting end for connecting with the impeller, and the stator comprises a first stator unit and a second stator unit arranged along the extending direction of the rotating shaft, and the first stator unit and the second stator unit can drive the rotor to rotate; the rotor is positioned on the first stator unit and the second stator unit in the extending direction of the rotating shaft; the first stator unit is located between the connecting end of the rotating shaft and the rotor, and the conducting wire is connected with the first stator unit.

13. The driving apparatus as claimed in claim 12, wherein the rotor includes a first magnet, a second magnet and a flywheel, the first magnet and the second magnet are mounted on the flywheel, and the flywheel is fixed to the rotating shaft; in the extending direction of the rotating shaft, the flywheel is positioned between the first stator unit and the second stator unit; the first stator unit can generate a rotating magnetic field for driving the first magnet to rotate, and the second stator unit can generate a rotating magnetic field for driving the second magnet to rotate.

14. The driving device according to claim 1, wherein the rotating shaft has a connecting end for connecting with the impeller, the rotor includes a first magnet and a second magnet, the first magnet and the second magnet are both fixedly connected to the rotating shaft, the stator includes a first stator unit and a second stator unit arranged along an extending direction of the rotating shaft, the first stator unit is capable of generating a rotating magnetic field for driving the first magnet to rotate, and the second stator unit is capable of generating a rotating magnetic field for driving the second magnet to rotate; the first magnet, the first stator unit, the second magnet and the second stator unit are sequentially arranged along the extension direction of the rotating shaft, and the first magnet is close to the connecting end of the rotating shaft; the conducting wire is connected with the first stator unit, and the isolation section corresponds to the position of the second magnet.

15. The driving device according to any one of claims 12 to 14, wherein the rotating shaft is rotatably disposed through the first stator unit, and in an extending direction of the rotating shaft, an end of the rotating shaft away from the connecting end is spaced from the second stator unit; the first stator unit and the second stator unit are both provided with magnetic cores, each magnetic core comprises a magnetic column, and the cross-sectional area of the magnetic column of the second stator unit is larger than that of the magnetic column of the first stator unit.

16. The drive device of claim 1, wherein the cover is welded to the connection site.

17. A blood pump comprising an impeller and a drive device as claimed in any one of claims 1 to 16, the impeller being connected to the shaft, the impeller being rotatable with the shaft.