Drive device and blood pump

Abstract

A drive device (400) and a blood pump (10) are disclosed. The drive device (400) includes a pump housing (410), a stator (430), a rotor (440), a conducting wire (450), and a cover body (470). The pump housing (410) has a first wiring hole (413), a second wiring hole (414), and a position limiting groove (416d). The conducting wire (450) is provided to penetrate through the first wiring hole (413) and the second wiring hole (414). The conducting wire (450) has an isolation segment (452) corresponding to the position of the rotor (440). The isolation segment (452) is located between the first wiring hole (413) and the second wiring hole (414). At least a part of the isolation segment (452) is restricted by the position limiting groove (416d). The cover body (470) covers the first wiring hole (413), the second wiring hole (414), the position limiting groove (416d), and the isolation segment (452).

Description

Technical Field

[0001] (Cross - reference to related applications) This application claims the priority of a Chinese patent application with application number CN202210654824.5, filed with the China National Intellectual Property Administration on June 10, 2022, and all of its content is incorporated herein by reference.

[0002] This application relates to the technical field of medical devices, and particularly to a driving device and a blood pump.

Background Art

[0003] An intravascular blood pump is a blood pumping device that can enter the patient's heart through the patient's blood vessels. The intravascular blood pump is placed within the opening of the heart valve so that blood flows through the blood pump and into the arterial blood vessels. However, conventional blood pumps have the problem of high failure rates.

Summary of the Invention

Problems to be Solved by the Invention

[0004] Based on this, this application provides a driving device and a blood pump that can reduce the failure rate of the blood pump.

Means for Solving the Problems

[0005] An embodiment of the first aspect of this application provides a driving device for driving and rotating an impeller. The driving device includes a pump housing having an accommodation cavity, wherein a first wiring hole, a second wiring hole, and a position - limiting groove are further formed in the housing wall of the pump housing. Both the second wiring hole and the first wiring hole communicate with the accommodation cavity. The second wiring hole and the first wiring hole are provided at an interval. The position - limiting groove is located outside the housing wall of the pump housing and is located between the pump housing where the first wiring hole and the second wiring hole are located, and A rotating shaft configured to be connected to the impeller and rotatably attached to the pump housing, A rotor rotatably accommodated in the accommodation cavity, fixedly connected to the rotating shaft, and driving the rotating shaft to rotate, A stator accommodated in the accommodation cavity and driving the rotor to rotate, A conducting wire connected to the stator, the conducting wire being provided to penetrate through the first wiring hole and the second wiring hole, the conducting wire having an isolation segment corresponding to the position of the rotor, the isolation segment being located between the first wiring hole and the second wiring hole, at least a part of the isolation segment being restricted by the position restriction groove, and the groove wall of the position restriction groove being the conducting wire located between the rotor and the isolation segment, A cover body connected to the pump housing and completely covering the first wiring hole, the second wiring hole, the position restriction groove, and the isolation segment.

[0006] An embodiment of the second aspect of the present application provides a blood pump including an impeller and a driving device for driving the impeller to rotate. The driving device A pump housing having an accommodation cavity, and a first wiring hole, a second wiring hole, and a position restriction groove are further formed in the housing wall of the pump housing. Both the second wiring hole and the first wiring hole communicate with the accommodation cavity. The second wiring hole and the first wiring hole are provided at an interval. The position restriction groove is located outside the housing wall of the pump housing and the position restriction groove is the pump housing located between the first wiring hole and the second wiring hole, A rotating shaft configured to be connected to the impeller and rotatably attached to the pump housing, A rotor rotatably accommodated in the accommodation cavity, fixedly connected to the rotating shaft, and driving the rotating shaft to rotate, A stator accommodated in the accommodation cavity and driving the rotor to rotate, A conducting wire connected to the stator, the conducting wire being provided to penetrate through the first wiring hole and the second wiring hole, the conducting wire having an isolation segment corresponding to the position of the rotor, the isolation segment being located between the first wiring hole and the second wiring hole, at least a part of the isolation segment being restricted by the position restriction groove, and the groove wall of the position restriction groove being the conducting wire located between the rotor and the isolation segment, A cover body connected to the pump housing and completely covering the first wiring hole, the second wiring hole, the position restriction groove, and the isolation segment. The impeller is fixedly connected to the rotating shaft and is rotatable together with the rotating shaft.

[0007] The details of one or more embodiments of the present application are described in the following drawings and description. Other features, objectives, and advantages of the present application will become apparent from the specification, drawings, and claims.

Brief Description of the Drawings

[0008] In order to more clearly explain the technical solutions in the embodiments of the present application, the drawings necessary for the description of the embodiments or the prior art are briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative effort.

[0009]

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Embodiments for Carrying Out the Invention

[0010] Hereinafter, in order to more clearly understand the object, technical solution and advantages of the present application, the present application will be described in more detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for the purpose of interpreting the present application and do not limit the present application.

[0011] In addition, when an element is referred to as being "fixed to" or "provided on" another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or indirectly connected to the other element.

[0012] Also, the terms "first" and "second" are for illustrative purposes only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features shown. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, "a plurality" means two or more unless otherwise specified.

[0013] Hereinafter, in order to explain the technical means of this application, it will be described with reference to specific drawings and examples.

[0014] In this specification, one end close to the operator is defined as the "proximal end", and one end away from the operator is defined as the "distal end".

[0015] As shown in FIGS. 1 and 2, a blood pump 10 according to an embodiment of the present application includes a cannula assembly 100, an impeller 200, a catheter 300, and a driving device 400. The cannula assembly 100 is connected to one end of the driving device 400, the catheter 300 is connected to the other end of the driving device 400, the impeller 200 is rotatably provided in the cannula assembly 100, the impeller 200 is connected to the driving device 400, and the driving device 400 can drive the impeller 200 to rotate, thereby realizing the blood pumping function of the blood pump 10.

[0016] Specifically, the cannula assembly 100 has an inlet 110 and an outlet 120. The outlet 120 is closer to the drive device 400 than the inlet 110. In one embodiment, the cannula assembly 100 penetrates a heart valve, such as the aortic valve, the inlet 110 is located within the heart, and the outlet 120 and the drive device 400 are located within a blood vessel such as the aorta outside the heart. When the impeller 200 rotates, blood flows into the cannula assembly 100 through the inlet 110 and then flows out of the cannula assembly 100 through the outlet 120.

[0017] In the illustrated embodiment, the cannula assembly 100 includes a first cannula 130 and a second cannula 140 connected to the first cannula 130. One end of the first cannula 130 away from the second cannula 140 is connected to the drive device 400. The inlet 110 is formed in the second cannula 140, and the outlet 120 is formed in the first cannula 130.

[0018] The position of the impeller 200 generally corresponds to the position of the outlet 120. Specifically, the impeller 200 is located within the first cannula 130.

[0019] The catheter 300 is fitted to one end of the drive device 400 away from the cannula assembly 100. The catheter 300 houses various supply lines. The supply line may be, for example, a cleaning line for introducing a cleaning liquid into the drive device 400, may be, for example, a conducting wire for supplying power to the drive device 400, or may be, for example, a support member for supporting the catheter 300.

[0020] As shown in FIGS. 3 to 4, the drive device 400 includes a pump housing 410, a rotating shaft 420, a stator 430, a rotor 440, and a conducting wire 450. The rotating shaft 420 is rotatably attached to the pump housing 410. Both the stator 430 and the rotor 440 are accommodated in the pump housing 410. The rotor 440 is fixedly connected to the rotating shaft 420. At least a part of the conducting wire 450 is accommodated in the pump housing 410. The conducting wire 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. The impeller 200 can rotate together with the rotating shaft 420.

[0021] In some embodiments, the pump housing 410 has a cylindrical shape with a substantially circular cross-section. The pump housing 410 has an accommodation cavity 412.

[0022] One end of the rotating shaft 420 is accommodated in the accommodation cavity 412, and the other end extends from the pump housing 410 and is fixedly connected to the impeller 200. The extending direction of the rotating shaft 420 coincides with the axial direction of the pump housing 410. One end of the rotating shaft 420 for connecting to the impeller 200 is a connection end 421. The rotating shaft 420 may be made of a material such as ceramics or stainless steel. For example, the ceramics are alumina toughened zirconia (ATZ) ceramics, and the stainless steel is SUS316L. In this way, the torsional strength of the rotating shaft 420 is improved, and breakage of the rotating shaft 420 due to excessive torque is avoided.

[0023] The stator 430 is housed within the accommodation cavity 412. In the illustrated embodiment, the stator 430 includes a first stator unit 432 and a second stator unit 433, and both the first stator unit 432 and the second stator unit 433 can drive the rotor 440 to rotate. Specifically, the first stator unit 432 and the second stator unit 433 are provided at intervals along the extending direction of the rotation axis 420. The first stator unit 432 and the second stator unit 433 are both fixedly connected to the pump housing 410. The rotation axis 420 is rotatably provided through the first stator unit 432. That is, the rotation axis 420 is rotatable with respect to the pump housing 410, and the first stator unit 432 and the second stator unit 433 are non-rotatable with respect to the pump housing 410.

[0024] 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 drive the rotor 440 to rotate synchronously. The first stator unit 432 and the second stator unit 433 can both drive the rotor 440 to rotate, or can also drive the rotor 440 to rotate alone.

[0025] In some embodiments, the rotor 440 has magnetism, and the stator 430 can generate a rotating magnetic field that drives the rotor 440 to rotate. Specifically, both the first stator unit 432 and the second stator unit 433 can generate a rotating magnetic field that drives the rotor 440 to rotate.

[0026] 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. There are a plurality of first magnetic cores 4321, and the plurality of first magnetic cores 4321 are provided at intervals along the circumference. Specifically, the extending direction of each first magnetic core 4321 coincides with the extending direction of the rotation axis 420. Each first magnetic core 4321 is fixedly connected to the first back plate 4323. The first coil 4322 is wound around the first magnetic core 4321. In the illustrated embodiment, the first coil 4322 is wound around each first magnetic core 4321.

[0027] The structure of the second stator unit 433 is the same as 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 fixedly connected to the pump housing 410. There are a plurality of second magnetic cores 4331, and the plurality of second magnetic cores 4331 are provided at intervals along the circumference. Specifically, the extending direction of each second magnetic core 4331 is parallel to the axis of the rotation axis 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, the second coil 4332 is wound around each second magnetic core 4331.

[0028] In some embodiments, both the first magnetic core 4321 and the second magnetic core 4331 include a magnetic column and a head (i.e., a pole piece) provided at one end of the magnetic column, and the extending direction of the magnetic column coincides with the extending direction of the rotation axis. The first back plate 4323 is joined to one end of the magnetic column of the first magnetic core 4321 that is away from the head, and the second back plate 4333 is joined to one end of the magnetic column of the second magnetic core 4331 that is away from the head. In the extending direction of the magnetic column, the magnetic column presents a columnar body with a substantially uniform size, that is, the cross-sectional size of the magnetic column 4331 is kept constant, and generally speaking, the thickness of the magnetic column 4331 is uniform. The first coil 4322 is wound around the magnetic column of the first magnetic core 4321, and the second coil 4332 is wound around the magnetic column of the second magnetic core 4331.

[0029] As shown in FIGS. 5 and 6, in the illustrated embodiment, both the first magnetic core 4321 and the second magnetic core 4331 include only magnetic columns, that is, the first magnetic core 4321 and the second magnetic core 4331 do not have wide heads (i.e., pole pieces). In this case, the entire first magnetic core 4321 can be magnetically coupled to the rotor 440, and the entire second magnetic core 4331 can be magnetically coupled to the rotor 440. Compared with a magnetic core having a pole piece, a magnetic core having only a magnetic column can reduce magnetic loss and increase the magnetic coupling density between the magnetic core and the rotor, so that for the same current, the torque on the rotor from the stator unit can be increased. On the other hand, a magnetic core without a head can greatly reduce the problem that the power of the driving device 400 decreases due to local magnetic short circuit caused by the contact between adjacent magnetic cores.

[0030] It should be noted that the first magnetic core 4321 and the second magnetic core 4331 are not limited to the above two forms. In some embodiments, one of the first magnetic core 4321 and the second magnetic core 4331 may have both a magnetic column and a head, and the other may have only a magnetic column.

[0031] The cross-sectional shape of the magnetic poles of the first magnetic core 4321 and the second magnetic core 4331 may be a sector, a circle, a trapezoid, an annular sector, or the like. In the illustrated embodiment, the magnetic poles are substantially triangular prisms, and one edge of each magnetic pole faces the axis of the rotation axis. In some embodiments, the edges of the magnetic poles are all chamfered, that is, the edges of the magnetic poles are relatively smooth and blunt chamfered edges, thereby removing the sharp corners of the magnetic poles and facilitating the subsequent winding of the coil, and also being advantageous for protecting the insulating material coated on the coil.

[0032] In the illustrated embodiment, in the extending direction of the rotation axis 420, the rotation axis 420 and the second stator unit 433 are provided at intervals, that is, one end of the rotation axis 420 away from the impeller 200 and the second stator unit 433 are provided at intervals, that is, the rotation axis 420 does not penetrate into the second stator unit 433, or in the extending direction of the rotation axis 420, one end of the rotation axis 420 away from the connection end 421 and the second stator unit 433 are provided at intervals. The cross-sectional area of the magnetic poles of the second stator unit 433 is larger than the cross-sectional area of the magnetic poles of the first stator unit 432. In the illustrated embodiment, since both the first magnetic core 4321 and the second magnetic core 4331 include only magnetic poles, the magnetic poles of the first stator unit 432 are the first magnetic core 4321, and the magnetic poles of the second stator unit 433 are the second magnetic core 4331.

[0033] The larger the cross-sectional area of the magnetic column, the larger the generated magnetic flux, the larger the torque on the rotor 440 from the stator unit, the smaller the required current, which is advantageous for reducing power consumption and heat generation. When the cross-sectional sizes of the first stator unit 432 and the second stator unit 433 are the same and the outer diameter of the pump housing 410 remains unchanged, the rotating shaft 420 is located outside the second stator unit 433, and the rotating shaft 420 is not provided to penetrate the second stator unit 433. Therefore, the cross-sectional size of the magnetic column of the second stator unit 433 can be reasonably increased without increasing the outer diameter of the pump housing 410. In this way, the driving torque on the rotor 440 from the second stator unit 433 can be increased. When the required torque is the same, this method can reasonably reduce the current supply to the stator coil, reduce power consumption, reduce the heat generation amount of the driving device 400, and avoid discomfort and even injury to the human body caused by heat concentration and excessive temperature during the operation process of the blood pump.

[0034] In addition, in other embodiments, the rotating shaft 420 may be inserted into the second stator unit 433. In this case, the cross-sectional areas of the magnetic columns of the first stator unit 432 and the second stator unit 433 are the same.

[0035] 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.

[0036] The back plate can play a role in closing the magnetic circuit of the stator unit, promoting and increasing the generation of magnetic flux in the stator unit, and improving the coupling ability between the stator unit and the rotor 440. In other words, by providing the first back plate 4323 on the first stator unit 432, the generation of magnetic flux in the first stator unit 432 can be promoted and increased, and the coupling ability between the first stator unit 432 and the rotor 440 can be improved. By providing the second back plate 4333 on the second stator unit 433, the generation of magnetic flux in the second stator unit 433 can be promoted and increased, and the coupling ability between the second stator unit 433 and the rotor 440 can be improved. Since the back plate can increase the magnetic flux, providing back plates on the first stator unit 432 and the second stator unit 433 respectively is advantageous for reducing the diameter of the entire drive device 400.

[0037] As shown in FIGS. 3 and 4, the drive device 400 further includes a positioning member 460. The positioning member 460 is fixedly connected within the pump housing 410. The positioning member 460 has a placement surface 462 and positioning posts 464. One end of the positioning post 464 is fixed to the placement surface 462, and the other end of the positioning post 464 protrudes at a certain height with respect to the placement surface 462. That is, the positioning post 464 is provided protruding from the placement surface 462. A positioning hole 4334 is provided in the second back plate 4333 of the second stator unit 433, and the positioning post 464 is inserted into the positioning hole 4334, and the second back plate 4333 abuts against the placement surface 462. Thereby, the positioning member 460 can exert a positioning function on the second stator unit 433, and the mounting accuracy and mounting efficiency of the second stator unit 433 can be improved. Specifically, the central axis of the positioning post 464 and the central axis of the second stator unit 433 overlap each other.

[0038] A through hole 466 is further formed in the positioning member 460. The through hole 466 communicates with a cleaning line for introducing a cleaning liquid into the drive device 400 or is used for attaching a cleaning line.

[0039] In some embodiments, the first stator unit 432 may not have the first backplate 4323, the second stator unit 433 may not have the second backplate 4333, or one of the first stator unit 432 and the second stator unit 433 may have a backplate while the other may not have a backplate. When the second stator unit 433 does not have the second backplate 4333, a plurality of positioning holes may be directly formed in the positioning member 460, and one ends of the plurality of second magnetic cores 4331 are respectively positioned in the plurality of positioning holes.

[0040] In some embodiments, the positioning member 460 may be omitted. At this time, an engaging portion for engaging with the edge of the second backplate 4333 may be provided in the pump housing 410, and the second stator unit 433 may be fixed by the engagement between the engaging portion and the second backplate 4333. Alternatively, the second stator unit 433 may be adhesively fixed to the pump housing 410 by an adhesive. The first stator unit 432 may be adhesively fixed to the pump housing 410 by an adhesive, or the first stator unit 432 may be fixed by providing a corresponding engaging portion in the pump housing 410 and engaging with the first backplate 4323.

[0041] The rotor 440 is accommodated in the accommodation cavity 412 of the pump housing 410. Specifically, the rotor 440 includes a first magnet 442 and a second magnet 443. Both the first magnet 442 and the second magnet 443 are fixedly connected 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 can generate a rotating magnetic field to drive the first magnet 442 to rotate, and the second stator unit 433 can generate a rotating magnetic field to drive the second magnet 443 to rotate. The two stator units can respectively provide torque to the rotor 440 by the two magnets, and increase the driving force for rotating the rotor 440.

[0042] In the illustrated embodiment, both the first magnet 442 and the second magnet 443 are located between the first stator unit 432 and the second stator unit 433. That is, along the extending direction of the rotation axis 420, the first stator unit 432, the first magnet 442, the second magnet 443, and the second stator unit 433 are arranged in sequence.

[0043] Specifically, the rotor 440 further includes a flywheel 444. The flywheel 444 is fixedly connected to the rotation axis 420. The flywheel 444 is located between the first stator unit 432 and the second stator unit 433. Both 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 one end away from the connection end 421 of the rotation axis 420.

[0044] By providing the flywheel 444, the connection strength between the first magnet 442 and the second magnet 443 and the rotation axis 420 can be improved. Also, by providing both the first magnet 442 and the second magnet 443 on the same flywheel 444, the sway during the rotation of the rotation axis 420 can be reduced, and the rotation axis 420 can be made more stable during rotation.

[0045] As shown in FIGS. 7 to 9, in the illustrated embodiment, the flywheel 444 includes a built-in pipe 4442, a disk-shaped portion 4444, and an outer annular wall 4446. Both the built-in pipe 4442 and the outer annular wall 4446 are of a circular tubular structure, and the disk-shaped portion 4444 is of an annular disk structure. The built-in pipe 4442 and the outer annular wall 4446 are both fixedly connected to the disk-shaped portion 4444. The outer annular wall 4446 is provided so as to surround the disk-shaped portion 4444. The built-in pipe 4442 and the outer annular wall 4446 are coaxially provided. The rotation shaft 420 is provided to penetrate through the built-in pipe 4442 and is fixedly connected to the built-in pipe 4442. An accommodation space is formed between the built-in pipe 4442 and the outer annular wall 4446, and the disk-shaped portion 4444 partitions the accommodation space into two mounting cavities 4448. Both of the two mounting cavities 4448 are annular cavities. The first magnet 442 and the second magnet 443 are respectively accommodated in the two mounting cavities 4448. The first magnet 442 and the second magnet 443 are both annular. The shapes of the two mounting cavities 4448 are adapted to the first magnet 442 and the second magnet 443 respectively, facilitating the mounting and positioning of the first magnet 442 and the second magnet 443. In this way, the flywheel 444 can exert a position-limiting effect on the first magnet 442 and the second magnet 443, not only facilitating the mounting of the first magnet 442 and the second magnet 443, but also making the connection between the first magnet 442 and the second magnet 443 and the flywheel 444 more stable.

[0046] Note that the flywheel 444 is not limited to the above structure. In some embodiments, the flywheel 444 has no outer annular wall 4446. In some embodiments, the flywheel 444 has neither an outer annular wall 4446 nor a built-in pipe 4442. At this time, the rotation shaft 420 is fixedly provided to penetrate through the disk-shaped portion 4444, for example, the center of the disk-shaped portion 4444. By providing the built-in pipe 4442 for the flywheel 444 having only the disk-shaped portion 4444, the flywheel 444 and the rotation shaft 420 can be more stably connected.

[0047] In some embodiments, both the first magnet 442 and the second magnet 443 are annular Halbach array magnets. Specifically, both the first magnet 442 and the second magnet 443 include a plurality of magnetic bodies. For example, the number of magnetic bodies is 4, 6, 8, 10, etc. Each magnetic body is an annular sector. The plurality of magnetic bodies of the first magnet are provided to surround the rotation axis 420 to form an annular structure, and the plurality of magnetic bodies of the second magnet 443 are provided to surround the rotation axis 420 to form an annular structure.

[0048] More specifically, the first magnet 442 has a first magnetic body 4422 magnetized along the axial direction of the first magnet 442, and the second magnet 443 has a second magnetic body 4432 magnetized along the axial direction of the second magnet 443. The first magnetic body 4422 and the second magnetic body 4432 are respectively provided on both opposite sides of the disk-shaped portion 4444. The first magnetic body 4422 and the second magnetic body 4432 are located on opposite sides of each other. In the extending direction of the rotation axis 420, the polarities of the sides of the first magnetic body 4422 and the second magnetic body 4432 facing the disk-shaped portion 4444 are opposite. In this way, the attachment of the first magnet 442 and the second magnet 443 is facilitated, and the problem that the first magnetic body 4422 and the second magnetic body 4432 corresponding to the positions of the first magnet 442 and the second magnet 443 located at the disk-shaped portion 4444 repel each other and make assembly difficult can be avoided. For example, if the polarity of the side of the first magnetic body 4422 facing the disk-shaped portion 4444 is the N pole, the polarity of the side of the second magnetic body 4432 facing the disk-shaped portion 4444 is the S pole. According to the principle that the N pole and the S pole attract each other, the interference of the magnetic repulsive force is removed, and the attachment efficiency of the first magnet 442 and the second magnet 443 is improved.

[0049] To facilitate the attachment of the first magnet 442 and the second magnet 443 and improve the attachment accuracy of the first magnet 442 and the second magnet 443, the flywheel 444 is further provided with a marking portion 445 for specifying the attachment positions of the first magnetic body 4422 and the second magnetic body 4432. The marking portion 445 may be provided as a groove, a scale line, a mark, or the like. When attaching the first magnet 442 and the second magnet 443, if the positions of one of the magnetic bodies of the first magnet 442 and the second magnet 443 are marked using the marking portion 445 respectively, the attachment positions of the remaining magnetic bodies can be specified, facilitating the attachment of the first magnet 442 and the second magnet 443. Specifically, the marking portion 445 is provided on at least one of the built-in tube 4442, the disk-shaped portion 4444, and the outer ring wall 4446. Specifically, in the illustrated embodiment, the marking portion 445 is provided on the end faces at both ends of the built-in tube 4442.

[0050] Referring to FIGS. 4 and 10 to 12, in the illustrated embodiment, one end of the conducting wire 450 is connected to the first stator unit 432, and the other end of the conducting wire 450 is connected to the second stator unit 433. In some embodiments, both ends of the conducting wire 450 are electrically connected to the first coil 4322 of the first stator unit 432 and the second coil 4332 of the second stator unit 433 respectively. Note that the connection method between the first stator unit 432 and the second stator unit 433 is not limited to the above method. In some embodiments, one end of the conducting wire 450 away from the first stator unit 432 extends from the pump housing 410 into the catheter 300 and is connected to an external power supply device, and the second stator unit 433 is connected to the external power supply device via another conducting wire.

[0051] Since there is a rotor 440 between the first stator unit 432 and the second stator unit 433, even if both ends of the conducting wire 450 are connected to the first stator unit 432 and the second stator unit 433 respectively, or one end of the conducting wire 450 is connected to the first stator unit 432 and the other end extends from the pump housing 410 to the catheter 300, the conducting wire 450 has a portion corresponding to the position of the rotor 440. The portion of the conducting wire 450 corresponding to the position of the rotor 440 is defined as the isolation segment 452. When the rotor 440 contacts the isolation segment 452 during rotation, there is a risk that the isolation segment 452 rotates with the rotor 440, causing faults such as breakage or detachment of the conducting wire 450.

[0052] Therefore, in this embodiment, on the housing wall of the pump housing 410, a first wiring hole 413 and a second wiring hole 414 are further formed at intervals, and both the first wiring hole 413 and the second wiring hole 414 communicate with the accommodation cavity 412. The conducting wire 450 is provided to penetrate through the first wiring hole 413 and the second wiring hole 414. The isolation segment 452 is located between the first wiring hole 413 and the second wiring hole 414, and the isolation segment 452 is located outside the accommodation cavity 412. That is, the rotor 440 is located within the accommodation cavity 412, and the isolation segment 452 of the conducting wire 450 and the rotor 440 are respectively located on both sides of the housing wall of the pump housing 410 between the first wiring hole 413 and the second wiring hole 414. Therefore, the isolation segment 452 of the conducting wire 450 is partitioned from the rotor 440, thereby effectively avoiding the situation where the rotor 440 contacts the conducting wire 450 during rotation and the conducting wire 450 rotates with the rotor 440, causing faults such as breakage or detachment of the conducting wire 450, and ensuring the normal use of the blood pump 10.

[0053] To avoid an external object (e.g., blood, etc.) from entering the accommodation cavity 412 through the first wiring hole 413 and the second wiring hole 414, and to prevent the isolation segment 452 of the conducting wire 450 from being exposed, the driving device 400 further includes a cover body 470. The cover body 470 is connected to the pump housing 410, and the cover body 470 completely covers the first wiring hole 413, the second wiring hole 414, and the isolation segment 452 of the conducting wire 450. The pump housing 410 has a connection site 415 for connecting to the cover body 470, and the connection site 415 surrounds the first wiring hole 413, the second wiring hole 414, and the isolation segment 452. In other words, the connection site 415 defines one area on the housing wall of the pump housing 410, and the first wiring hole 413, the second wiring hole 414, and the isolation segment 452 are located within the area defined by the connection site 415. In some embodiments, the cover body 470 and the connection site 415 are connected by welding.

[0054] In order to prevent damage to the portions of the conducting wire 450 located in the first wiring hole 413 and the second wiring hole 414 and to the isolation segment 452 located outside the accommodation cavity 412 due to the heat generated during the process of attaching the cover body 470 to the pump housing 410, the first wiring hole 413, the second wiring hole 414, and the isolation segment 452 of the conducting wire 450 are all spaced apart from the connection site 415 by a certain distance, and by maintaining a certain distance between the conducting wire 450 and the connection site 415 for connecting to the cover body 470 of the pump housing 410, it is possible to avoid damage to the conducting wire 450 due to the heat generated during the process of connecting the cover body 470 to the pump housing 410. For example, it is possible to avoid damage to the insulation layer of the conducting wire 450 at high temperatures. At the same time, since both the first wiring hole 413 and the second wiring hole 414 are spaced apart from the connection site 415 by a certain distance, it is possible to reduce the heat generated during the process of attaching the cover body 470 to the pump housing 410 from entering the interior of the accommodation cavity 412 through the first wiring hole 413 and the second wiring hole 414. Thereby, in order to reduce damage to the elements in the accommodation cavity 412 due to the heat generated during the attachment of the cover body 470, for example, damage to the coil insulation layer, for example, the influence on the magnetism of the magnetic elements, the above method can improve the yield rate and reduce the failure rate of the blood pump 10.

[0055] As shown in FIGS. 13 and 14, in the illustrated embodiment, the outer surface of the pump housing 410 is recessed to form a counterbore groove 416, and the counterbore groove 416 has a bottom wall 416a and an opening facing the bottom wall 416a. At least a part of the cover body 470 is received in the counterbore groove 416, and the edge of the cover body 470 is connected to the connection portion 415. The cover body 470 seals the opening of the counterbore groove 416. The connection portion 415 is provided so as to surround the opening of the counterbore groove 416. Specifically, the connection portion 415 is the edge of the opening of the counterbore groove 416. The first wiring hole 413 and the second wiring hole 414 are both formed in the bottom wall 416a of the counterbore groove 416, and the first wiring hole 413 and the second wiring hole 414 are both spaced apart from the edge of the bottom wall 416a of the counterbore groove 416 by a certain distance. The isolation segment 452 of the conducting wire 450 is located between the bottom wall 416a of the counterbore groove 416 and the cover body 470, and the bottom wall 416a of the counterbore groove 416 is located between the rotor 440 and the isolation segment 452 of the conducting wire 450.

[0056] By the outer peripheral side surface of the pump housing 410 being recessed to form the counterbore groove 416, the isolation segment 452 of the conducting wire 450 is partitioned, and by accommodating at least a part of the cover body 470 in the counterbore groove 416, not only is the local increase in the outer diameter of the pump housing 410 due to the installation of the cover body 470 reduced, and thus the local outer diameter of the pump housing 410 is not increased, but also the counterbore groove 416 can act as a position-limiting function for the cover body 470, not only facilitating the attachment of the cover body 470, but also better ensuring the stability of the connection between the cover body 470 and the pump housing 410.

[0057] Specifically, the counterbore groove 416 further has a side wall 416c provided so as to surround the bottom wall 416a, and the side wall 416c of the counterbore groove 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 and the bottom wall 416a of the counterbore groove 416.

[0058] In the illustrated embodiment, the first wiring hole 413 and the second wiring hole 414 are arranged at intervals in the axial direction of the pump housing 410. The first wiring hole 413 is closer to the connection end 421 of the rotating shaft 420 than the second wiring hole 414. In the circumferential direction of the pump housing 410, the widths of both the first wiring hole 413 and the second wiring hole 414 are smaller than the width of the bottom wall 416a of the counterbore groove 416. In the axial direction of the pump housing 410, the maximum distance between the separated sides of the first wiring hole 413 and the second wiring hole 414 is smaller than the width of the bottom wall 416a of the counterbore groove 416. As a result, both the first wiring hole 413 and the second wiring hole 414 are separated from the boundary of the bottom wall 416a of the counterbore groove 416 by a certain distance. Thereby, in the axial direction of the pump housing 410, a distal end isolation portion 417a is formed between the first wiring hole 413 and the distal end boundary of the bottom wall 416a of the counterbore groove 416, and a proximal end isolation portion 417b is formed between the second wiring hole 414 and the proximal end boundary of the bottom wall 416a of the counterbore groove 416. In the circumferential direction of the pump housing 410, a first lateral isolation portion 417c and a second lateral isolation portion 417d are respectively formed between the first wiring hole 413 and both side boundaries of the bottom wall 416a of the counterbore groove 416, and a third lateral isolation portion 417e and a fourth lateral isolation portion 417f are formed between the second wiring hole 414 and both side boundaries of the bottom wall 416a of the counterbore groove 416. The portion of the bottom wall 416a located between the first wiring hole 413 and the second wiring hole 414 forms a partition portion 417g. The distal end isolation portion 417a, the proximal end isolation portion 417b, the first lateral isolation portion 417c, the second lateral isolation portion 417d, the third lateral isolation portion 417e, the fourth lateral isolation portion 417f, and the partition portion 417g are connected to jointly form the bottom wall 416a of the counterbore groove 416. The partition portion 417g is located between the isolation segment 452 of the conducting wire 450 and the rotor 440.

[0059] In the present application, the side close to the impeller 200 of the pump housing 410 is defined as the distal end, and the side away from the impeller 200 of the pump housing 410 is defined as the proximal end. Accordingly, the distal end boundary of the bottom wall 416a of the counterbore groove 416 is the boundary on the side of the bottom wall 416a close to the impeller 200, and the proximal end boundary of the bottom wall 416a of the counterbore groove 416 is the boundary on the side of the bottom wall 416a away from the impeller 200. The direction of one revolution around the rotation axis 420 of the pump housing 410 is defined as the circumferential direction of the pump housing 410.

[0060] As shown in FIGS. 11 to 15, specifically, the pump housing 410 includes a first housing 418 and a second housing 419 connected to the first housing 418. The second housing 419 is fitted into the first housing 418 so as to define an accommodation cavity 412. The first housing 418 is closer to the connection end 421 of the rotation axis 420 than the second housing 419. The counterbore groove 416 is partially located in the second housing 419 and partially located in the first housing 418. The second wiring hole 414 is located in the second housing 419, and a notch 419a is formed in the second housing 419. The notch 419a is at least a part of the first wiring hole 413. By forming a notch in at least one of the first housing 418 and the second housing 419 and then forming the first wiring hole 413 by fitting the first housing 418 and the second housing 419, the insertion of the conducting wire 450 into the first wiring hole 413 during assembly can be facilitated, and in particular, the assembly efficiency can be improved for the first wiring hole 413 with a small hole diameter. The first stator unit 432 is accommodated in the first housing 418, and the second stator unit 433 and the rotor 440 are accommodated in the second housing 419. In the illustrated embodiment, the distal end isolation portion 417a is located in the first housing 418, and the proximal end isolation portion 417b, the first lateral isolation portion 417c, the second lateral isolation portion 417d, the third lateral isolation portion 417e, the fourth lateral isolation portion 417f, and the partition portion 417g are all located in the second housing 419.

[0061] Specifically, a step portion 419b is provided on the inner wall of the second housing 419 close to the first housing 418. The first housing 418 includes a first segment 418a and a second segment 418b provided coaxially. The outer diameter of the first segment 418a is smaller than the outer diameter of the second segment 418b. The first segment 418a is inserted into the second housing 419. The end face of the end of the first segment 418a away from the second segment 418b abuts against the step portion 419b of the second housing 419. The second segment 418b is located outside the second housing 419. In this way, during installation, the first segment 418a of the first housing 418 is inserted into the second housing 419, and at least one of the second housing 419 and the first housing 418 can be rotated to adjust the installation position. The second segment 418b of the first housing 418 is located outside the second housing 419 and abuts against the end of the second housing 419. In this way, the positioning and guiding functions of the second housing 419 with respect to the first housing 418 can be fully exerted, and the assembly efficiency and assembly accuracy between the two can be improved. The counterbore groove 416 has a part located in the first segment 418a and another part located in the second housing 419. More specifically, the distal end isolation portion 417a is located in the first segment 418a.

[0062] Note that the pump housing 410 is not limited to being separate. In some embodiments, the pump housing 410 may be integrally formed. The first wiring hole 413 and / or the second wiring hole 414 are not limited to the above manner. In some embodiments, the first wiring hole 413 may be completely provided in the first housing 418 or the second housing 419. In some embodiments, a notch is also provided at an end of the second housing 419 close to the first housing 418. The positions of the notch in the second housing 419 and the notch in the first housing 418 correspond to each other, and the notch in the second housing 419 and the notch in the first housing 418 jointly form the first wiring hole 413. In some embodiments, a notch is provided at one end of the first housing 418 close to the second housing 419, and no notch is provided in the second housing 419. After the first housing 418 and the second housing 419 are fitted together, the second wiring hole 414 is formed at the notch position.

[0063] In the illustrated embodiment, the shape and size of the cover body 470 are adapted to the countersink groove 416. Since the outer surface of the cover body 470 is flush with the outer surface of the pump housing 410, providing the cover body 470 does not increase the local outer diameter of the pump housing 410. Specifically, the cover body 470 is in the shape of a substantially arc-shaped plate, and the outer peripheral side surface of the pump housing 410 and the outer surface of the cover body 470 smoothly transition.

[0064] Specifically, the edge of the cover body 470 abuts against the edge of the bottom wall 416a of the countersink groove 416. Thereby, when the cover body 470 is attached, the bottom wall 416a can support the cover body 470, making it easier to attach the cover body 470 to the pump housing 410. More specifically, the cover body 470 abuts against both sides along the circumferential direction of the pump housing 410 at the proximal end isolation portion 417b, the distal end isolation portion 417a, the first lateral isolation portion 417c, the second lateral isolation portion 417d, the third lateral isolation portion 417e, the fourth lateral isolation portion 417f, and the partition portion 417g.

[0065] Specifically, at least one of the first wiring hole 413 and the second wiring hole 414 has an arcuate wall on the side close to the other, and the arcuate wall is a concave wall. In this way, the probability of damage to the insulating layer of the conducting wire 450 by the hole walls of the first wiring hole 413 and / or the second wiring hole 414 can be reduced. In the illustrated embodiment, the hole wall 413a of the first wiring hole 413 on the side close to the second wiring hole 414 is an arcuate wall.

[0066] In the illustrated embodiment, in the circumferential direction of the pump housing 410, the width of the first wiring hole 413 is smaller than the width of the second wiring hole 414. When there are a plurality of conducting wires 450, the small first wiring hole 413 can serve to bundle the isolation segments 452 of the plurality of conducting wires 450, and the large second wiring hole 414 facilitates the respective wiring of the conducting wires 450 to enter the accommodation cavity 412, and the conducting wires 450 can be rationally wired.

[0067] In one embodiment, a position limiting groove 416d is formed in the housing wall of the pump housing 410. The position limiting groove 416d is located outside the housing wall of the pump housing 410 and is positioned between the first wiring hole 413 and the second wiring hole 414. In the illustrated embodiment, the position limiting groove 416d is formed by a local position on the surface facing the cover body 470 of the bottom wall 416a of the counterbore groove 416 (specifically, the partition portion 417g) being recessed. In the circumferential direction of the pump housing 410, the width of the bottom wall 416a of the counterbore groove 416 (specifically, the partition portion 417g) is larger than the width of the position limiting groove 416d. For this reason, also in the circumferential direction of the pump housing 410, the width of the position limiting groove 416d is smaller than the width of the region defined by the connection portion 415. In other words, the connection portion 415 is provided so as to surround the first wiring hole 413, the second wiring hole 414, and the position limiting groove 416d, and the cover body 470 also completely covers the position limiting groove 416d. At least a part of the isolation segment 452 of the conducting wire 450 is restricted by the position limiting groove 416d. The position limiting groove 416d has a position limiting effect on the isolation segment 452 of the conducting wire 450. When assembling the drive device 400, especially when connecting the cover body 470 to the pump housing 410, it performs position limitation on the conducting wire 450 between the first wiring hole 413 and the second wiring hole 414, preventing the conducting wire 450 from being disturbed or moving, which would make the attachment of the cover body 470 inconvenient. Or, when attaching the cover body 470, it prevents the conducting wire 450 between the first wiring hole 413 and the second wiring hole 414 from moving to the connection location between the cover body 470 and the pump housing 410 (i.e., the connection portion 415), and further ensures that the isolation segment 452 of the conducting wire 450 does not move away from the connection portion 415 of the pump housing 410 to which the cover body 470 is connected.

[0068] In the illustrated embodiment, the extending direction of the position limiting groove 416b coincides with the axial direction of the pump housing 410. In the circumferential direction of the pump housing 410, the width of the position limiting groove 416d is greater than or equal to the width of the first wiring hole 413 and less than the width of the second wiring hole 414. Thereby, it facilitates bundling the isolation segment 452 of the conducting wire 450 in the position limiting groove 416d and also facilitates the conducting wire 450 being branched and wired at the second wiring hole 414 and entering the accommodation cavity 412.

[0069] Specifically, one end of the position limiting groove 416d communicates with the first wiring hole 413 and the other end communicates with the second wiring hole 414. Thereby, the hole wall on the side of the first wiring hole 413 close to the position limiting groove 416d is recessed more than the surface facing the cover body 470 of the bottom wall 416a, and the hole wall on the side of the second wiring hole 414 close to the position limiting groove 416d is recessed more than the surface facing the cover body 470 of the bottom wall 416a. In this way, the bending radian of the conducting wire 450 in the first wiring hole 413 and the second wiring hole 414 is reduced, and the influence of damage to the conducting wire 450 by the hole walls of the first wiring hole 413 and the second wiring hole 414 is reduced.

[0070] In the illustrated embodiment, in the circumferential direction of the pump housing 410, the position limiting groove 416d has an intermediate portion 416e with a large recess depth and two side portions 416f located on both sides of the intermediate portion 416e and having a small recess depth. The thickness of the housing wall of the pump housing 410 at the intermediate portion 416e of the position limiting groove 416d is smaller than the thickness of the housing wall of the pump housing 410 at the two side portions 416f of the position limiting groove 416d. The surface of each side portion 416f facing the cover body 470 with respect to the bottom wall 416a has a gradually decreasing recess depth along the direction away from the intermediate portion 416e, that is, along the direction away from the intermediate portion 416e, the thickness of the housing wall of the pump housing 410 at each side portion 416f gradually increases. This method facilitates the processing and forming of the pump housing 410 and can improve the yield of the pump housing 410. To reduce damage to the conducting wire 450, the groove wall of the side portion 416f of the position limiting groove 416d is an arc-shaped wall.

[0071] Specifically, the width of the intermediate portion 416e of the position limiting groove 416d is not less than the width in which the isolation segments 452 of the plurality of conducting wires 450 connected to the first stator unit are arranged in parallel in sequence, whereby the depth of the position limiting groove 416d is made as small as possible, the housing wall of the pump housing 410 has as large a thickness as possible at the position corresponding to the position limiting groove 416d, and the pump housing 410 has as large a strength as possible.

[0072] In some embodiments, the counterbore groove 416 may not be provided in the housing wall of the pump housing 410, and the position limiting groove 416d may be directly provided outside the housing wall of the pump housing 410. In this case, the position limiting groove 416d may be formed by a local depression on the outer surface of the housing wall of the pump housing 410. The groove wall of the position limiting groove 416d is located between the rotor 440 and the isolation segment 452 so as to separate the isolation segment 452 of the conducting wire 450 from the rotor 440. The cover body 470 is connected to the pump housing 410 and completely covers the first wiring hole 413, the second wiring hole 414, the position limiting groove 416d, and the isolation segment 452 to prevent an external object (e.g., blood, etc.) from entering the accommodation cavity 412 from the first wiring hole 413 and the second wiring hole 414, and to prevent the isolation segment 452 of the conducting wire 450 from being exposed. Correspondingly, the connection portion 415 is provided to surround the first wiring hole 413, the second wiring hole 414, and the position limiting groove 416d, and the first wiring hole 413, the second wiring hole 414, and the position limiting groove 416d are all spaced apart from the connection portion 415 by a certain distance, so as to avoid damage to the conducting wire 450 caused by the heat generated during the process of connecting the cover body 470 to the pump housing 410. For example, the insulation layer of the conducting wire 450 is damaged at high temperature. At the same time, by separating the first wiring hole 413 and the second wiring hole 414 from the connection portion 415 by a certain distance, the heat generated during the process of attaching the cover body 470 to the pump housing 410 can be reduced from entering the interior of the accommodation cavity 412 through the first wiring hole 413 and the second wiring hole 414. Thereby, damage to the elements in the accommodation cavity 412 caused by the heat generated when the cover body 470 is attached, such as damage to the coil insulation layer, for example, the influence on the magnetism of the magnetic elements, is reduced, the yield rate of the driving device 400 is improved, and the failure is reduced.

[0073] As shown in FIGS. 3 and 4, the driving device 400 further includes a shaft sleeve assembly 480. The shaft sleeve assembly 480 is fixed within the pump housing 410. The shaft sleeve assembly 480 is positioned between the first stator unit 432 and the impeller 200. The rotating shaft 420 is rotatably provided through the shaft sleeve assembly 480. By providing the shaft sleeve assembly 480, a radial position limiting effect on the rotating shaft 420 can be achieved, radial sway during the rotation process of the rotating shaft 420 can be reduced, and the rotational stability of the rotating shaft 420 can be improved. The shaft sleeve assembly 480 may be integrally formed or separately formed. In the illustrated embodiment, the pump housing 410 further has a third housing 405. The third housing 405 is fitted to one end of the first housing 418 away from the second housing 419. The shaft sleeve assembly 480 is fixedly accommodated within the third housing 405.

[0074] In the illustrated embodiment, the shaft sleeve assembly 480 includes a first shaft sleeve 482 and a second shaft sleeve 484. Both the first shaft sleeve 482 and the second shaft sleeve 484 are fixedly connected to the pump housing 410. The rotating shaft 420 is rotatably provided through the first shaft sleeve 482 and the second shaft sleeve 484. The first shaft sleeve 482 is closer to the impeller 200 than the second shaft sleeve 484.

[0075] As shown in FIG. 16, a first insertion hole 4821 and a position limiting hole 4823 are formed in the first shaft sleeve 482. Both the first insertion hole 4821 and the position limiting hole 4823 communicate with each other and are coaxially provided. The aperture of the position limiting hole 4823 is larger than the aperture of the first insertion hole 4821. Thereby, both the first insertion hole 4821 and the position limiting hole 4823 jointly form a stepped hole. The first shaft sleeve 482 has a first position limiting surface 4825 that defines a part of the boundary of the position limiting hole 4823.

[0076] As shown in FIG. 17, the second shaft sleeve 484 includes a thick segment 4841 and a thin segment 4843. The cross-section of the thin segment 4843 is smaller than that of the thick segment 4841. The thick segment 4841 has a contact surface 4845. The thin segment 4843 projects from the contact surface 4845. The second shaft sleeve 484 has a second insertion hole 4846. The second insertion hole 4846 extends from the end face at one end away from the contact surface 4845 of the thin segment 4843 to the side away from the contact surface 4845 of the thick segment 4841. Thereby, the second insertion hole 4846 penetrates through the thick segment 4841 and the thin segment 4843.

[0077] As shown in FIG. 18, the thin segment 4843 is inserted into the position limiting hole 4823, and the contact surface 4845 abuts against the first shaft sleeve 482. Due to the position limiting effect of the contact surface 4845 and the guiding effect of the thin segment 4843, the mounting accuracy and mounting efficiency of the entire shaft sleeve assembly 480 can be improved. The end face at one end away from the contact surface 4845 of the thin segment 4843 is the second position limiting surface 4847. The second position limiting surface 4847 and the first position limiting surface 4825 face each other with a gap therebetween. The hole wall of the position limiting hole 4823, the first position limiting surface 4825, and the second position limiting surface 4847 jointly define a position limiting cavity 486. Both the first insertion hole 4821 and the second insertion hole 4846 communicate with the position limiting cavity 486.

[0078] As shown in FIG. 19, the rotating shaft 420 includes a straight shaft portion 422 and a flange portion 424. The flange portion 424 is fixedly fitted on the straight shaft portion 422. The outer diameter of the flange portion 424 is larger than the diameter of the straight shaft portion 422.

[0079] The straight shaft portion 422 is provided to penetrate through the first insertion hole 4821 and the second insertion hole 4846. The flange portion 424 is accommodated in the position-limiting cavity 486. The outer diameter of the flange portion 424 is larger than the hole diameter of the first insertion hole 4821 and the outer diameter of the flange portion 424 is larger than the hole diameter of the second insertion hole 4846. The straight shaft portion 422 is provided to penetrate rotatably through the first stator unit 432. 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.

[0080] In the extending direction of the rotating shaft 420, the flange portion 424 is located between the first position-limiting surface 4825 and the second position-limiting surface 4847. The flange portion 424 can abut against the first position-limiting surface 4825 and the second position-limiting surface 4847, thereby positioning the rotating shaft 420 in the axial direction of the pump housing 410 and preventing the movement of the rotating shaft 420 in the axial direction of the pump housing 410 or limiting the movement range of the rotating shaft 420 in the axial direction of the pump housing 410. In some embodiments, the flange portion 424 always abuts against the first position-limiting surface 4825 and the second position-limiting surface 4847. In some embodiments, the distance between the first position-limiting surface 4825 and the second position-limiting surface 4847 is slightly larger than the height of the flange portion 424 in the axial direction, so that during the rotation of the rotating shaft 420, the flange portion 424 has a certain floating space for the cleaning fluid to flow between the first position-limiting surface 4825 and the second position-limiting surface 4847.

[0081] A first gap for the cleaning fluid to flow is formed between the straight shaft portion 422 and the hole wall of the first insertion hole 4821. A second gap for the cleaning fluid to flow is formed between the straight shaft portion 422 and the hole wall of the second insertion hole 4846. A third gap 487 for the cleaning fluid to flow is formed between the flange portion 424 and the cavity wall of the position-limiting cavity 486.

[0082] The local position of the first position limiting surface 4825 is recessed to form the first diversion groove 4826. The first diversion groove 4826 communicates with the first insertion hole 4821 and also communicates with the position limiting cavity 486. The local position of the second position limiting surface 4847 is recessed to form the second diversion groove 4848. The second diversion groove 4848 communicates with the second insertion hole 4846, and the first diversion groove 4826 communicates with the position limiting cavity 486. Thus, when the flange portion 424 abuts against the first position limiting surface 4825 and / or the second position limiting surface 4847, the first diversion groove 4826 can communicate the first gap and the third gap 487, and the second diversion groove 4848 can communicate the second gap and the third gap 487. The first insertion hole 4821 communicates with the cannula assembly 100, and the second insertion hole 4846 communicates with the accommodation cavity 412 of the pump housing 410.

[0083] When introducing the cleaning liquid to one end of the blood pump 10 away from the cannula assembly 100, the liquid flows through the accommodation cavity 412, the second gap, the third gap 487, and the first gap in sequence and then flows into the cannula assembly 100 and flows out from the outlet 120 of the cannula assembly 100. Since the flow direction of the cleaning liquid is opposite to the flow direction of the blood in the cannula assembly 100, it can prevent the blood in the cannula assembly 100 from flowing into the driving device 400. Also, the injected cleaning liquid flows through the first gap, the second gap, and the third gap 487, and also functions as a lubricant between the rotating shaft 420 and the shaft sleeve assembly 480, reducing the rotational resistance of the rotating shaft 420.

[0084] As shown in FIG. 19, a support protrusion 410a is further provided inside the pump housing 410. The support protrusion 410a is annular, and the side away from the contact surface 4845 of the rough segment 4841 of the second shaft sleeve 484 in the shaft sleeve assembly 480 abuts against the support protrusion 410a. The support protrusion 410a exerts a position-limiting effect on the entire shaft sleeve assembly 480 in the axial direction of the pump housing 410. Specifically, the support protrusion 410a is located in the third housing 405, and the first back plate 4323 of the first stator unit 432 is fixedly connected to the third housing 405.

[0085] Note that the drive device 400 is not limited to the above structure. 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 attached to the two flywheels.

[0086] In some embodiments, the rotor 440 may not have a flywheel 444 and may further include only the first magnet 442 and the second magnet 443. That is, the rotor 440 is still located between the first stator unit 432 and the second stator unit 433. At this time, the first magnet 442 and the second magnet 443 are directly and fixedly connected to the rotating shaft 420. At this time, the position of the isolation segment 452 of the conducting wire 450 corresponds to the positions of the first magnet 442 and the second magnet 443.

[0087] In some embodiments, the first magnet 442, the first stator unit 432, the second magnet 443, and the second stator unit 433 are arranged in sequence along the extending direction of the rotating shaft 420. The rotating shaft 420 may be provided to penetrate only the first stator unit 432, or the rotating shaft 420 may be provided to penetrate both 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 position of the isolation segment 452 of the conducting wire 450 corresponds to the position of the second magnet 443.

[0088] In some embodiments, the first magnet 442, the first stator unit 432, the second stator unit 433, and the second magnet 443 are arranged in sequence along the extending direction of the rotation axis 420. The rotation axis 420 is rotatably provided 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 rotation axis 420. At this time, there are a plurality of conducting wires 450. Some of the conducting wires 450 are connected to the first stator unit 432, and some of the conducting wires 450 are connected to the second stator unit 433. Each conducting wire 450 has an isolation segment 452. The positions of the isolation segments 452 of the plurality of conducting wires 450 all correspond to the position of the second magnet 443. At this time, so that the isolation segments 452 of each conducting wire 450 are all located outside the accommodation cavity 412, the plurality of conducting wires 450 are all provided to penetrate through the first wiring hole 413 and the second wiring hole 414, or the first stator unit 432 and the second stator unit 433 are connected by other conducting wires, and the conducting wire 450 is connected to one of the first stator unit 432 and the second stator unit 433.

[0089] In some embodiments, the first stator unit 432, the first magnet 442, the second stator unit 433, and the second magnet 443 are arranged in sequence along the extending direction of the rotation axis 420. The first stator unit 432 is close to the connection end 421 of the rotation axis 420. At this time, the pump housing 410 can partition the isolation segments 452 of the conducting wire 450 by respectively providing the first wiring hole 413 and the second wiring hole 414 at positions corresponding to the first magnet 442 and the second magnet 443.

[0090] In some embodiments, the rotor 440 has only one magnet. 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.

[0091] In some embodiments, the stator 430 has only one stator unit. In this case, when the impeller 200, the stator 430, and the rotor 440 are arranged in sequence along the extending direction of the rotation axis 420, the conducting wire 450 is connected to the stator 430.

[0092] Since the drive device of this embodiment has the same structure as the drive device of the first embodiment, the drive device of this embodiment and the blood pump provided therewith also have the same effects as those of the first embodiment.

[0093] The above embodiments are merely for explaining the technical solutions of the present application and do not limit it. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that the technical solutions described in each of the foregoing embodiments can be modified, or equivalent replacements can be made to some of the technical features thereof. These modifications and replacements do not depart from the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of each embodiment of the present application, and should all be included in the protection scope of the present application.

Claims

1. A driving device for driving and rotating an impeller, comprising: A pump housing having a housing cavity, wherein a first wiring hole, a second wiring hole, and a position limiting groove are further formed in the housing wall of the pump housing. Both the second wiring hole and the first wiring hole communicate with the housing cavity. The second wiring hole and the first wiring hole are provided at an interval. The position limiting groove is located outside the housing wall of the pump housing, and the position limiting groove is located between the pump housing where the first wiring hole and the second wiring hole are located, A rotating shaft configured to be connected to the impeller and rotatably attached to the pump housing, A rotor rotatably accommodated in the housing cavity, fixedly connected to the rotating shaft, and driving the rotating shaft to rotate, A stator accommodated in the housing cavity and driving the rotor to rotate, A conducting wire connected to the stator, the conducting wire is provided to penetrate through the first wiring hole and the second wiring hole, the conducting wire has an isolation segment corresponding to the position of the rotor, the isolation segment is located between the first wiring hole and the second wiring hole, at least a part of the isolation segment is limited by the position limiting groove, and the groove wall of the position limiting groove is located between the rotor and the conducting wire of the isolation segment, A cover body connected to the pump housing and completely covering the first wiring hole, the second wiring hole, the position limiting groove, and the isolation segment. The driving device is characterized by the above.

2. The position limiting groove extends from the first wiring hole to the second wiring hole. Both the first wiring hole and the second wiring hole communicate with the position limiting groove. The position limiting groove is formed by the outer surface of the pump housing being recessed. The driving device according to claim 1 is characterized by the above.

3. In the circumferential direction of the pump housing, the position limiting groove has an intermediate portion with a large recess depth and two side portions located on both sides of the intermediate portion and having a small recess depth. The thickness of the housing wall of the pump housing at the intermediate portion of the position limiting groove is smaller than the thickness of the housing wall of the pump housing at the two side portions of the position limiting groove, and along the direction away from the intermediate portion, the thickness of the housing wall of the pump housing at each side portion gradually increases. The drive device according to claim 2, characterized in that.

4. There are a plurality of the conducting wires, each of the conducting wires has a separating portion, and the width of the intermediate portion of the position limiting groove is not less than the width in which the separating segments of the plurality of conducting wires are arranged in parallel in sequence. The drive device according to claim 2, characterized in that.

5. In the circumferential direction of the pump housing, the width of at least one of the first wiring hole and the second wiring hole is larger than the width of the position limiting groove. The drive device according to claim 1, characterized in that.

6. In the circumferential direction of the pump housing, the width of one of the first wiring hole and the second wiring hole is not more than the width of the position limiting groove, or in the circumferential direction of the pump housing, the width of one of the first wiring hole and the second wiring hole is not more than the width of the position limiting groove, and the width of the other is larger than the width of the position limiting groove. The drive device according to claim 1, characterized in that.

7. The hole wall on the side close to the position limiting groove of at least one of the first wiring hole and the second wiring hole is an arc-shaped wall, and the arc-shaped wall is a concave wall. The drive device according to claim 1, characterized in that.

8. A connection portion is provided on the pump housing. The connection portion is provided so as to go around the first wiring hole, the second wiring hole, and the position limiting groove, and the first wiring hole, the second wiring hole, and the position limiting groove are all separated from the connection portion by a certain distance. The cover body is connected to the connection portion. The drive device according to claim 1, characterized in that.

9. The outer surface of the pump housing is recessed to form a countersunk groove, the countersunk groove has a bottom wall and an opening facing the bottom wall, the first wiring hole, the second wiring hole and the position limiting groove are all located on the bottom wall of the countersunk groove, in the circumferential direction of the pump housing, the width of the bottom wall of the countersunk groove is larger than the width of the position limiting groove, at least a part of the cover body is accommodated in the countersunk groove, and the connection part is the edge of the opening of the countersunk groove. The driving device according to claim 8, characterized in that.

10. The first wiring hole, the second wiring hole and the position limiting groove are all separated from the edge of the bottom wall of the countersunk groove by a certain distance, and the edge of the cover body abuts against the edge of the bottom wall of the countersunk groove. The driving device according to claim 9, characterized in that.

11. The pump housing includes a first housing and a second housing connected to the first housing. The second housing is fitted into the first housing so as to define the accommodation cavity. A part of the countersunk groove is located in the second housing and another part is located in the first housing. A stepped portion is provided on the inner wall of the second housing close to the first housing. The first housing includes a first segment and a second segment provided coaxially. The outer diameter of the first segment is smaller than the outer diameter of the second segment. The first segment is inserted into the second housing. The end face of the first segment away from the second segment abuts against the stepped portion of the second housing. The second segment is located outside the second housing. A part of the bottom wall of the countersunk groove is located in the first segment and another part is located in the second housing. The driving device according to claim 9, characterized in that.

12. The cover body is welded to the connection part, or the outer surface of the pump housing is recessed to form a countersunk groove. The countersunk groove has a bottom wall and an opening facing the bottom wall. The position limiting groove is provided on the bottom wall. The side of the cover body away from the bottom wall of the countersunk groove is flush with the outer surface of the pump housing. The driving device according to claim 8, characterized in that.

13. The pump housing includes a first housing and a second housing connected to the first housing. The second housing is fitted to the first housing so as to define the accommodation cavity. The second wiring hole is located in the second housing. A notch is formed at an end of at least one of the second housing and the first housing that is close to the other. The notch is at least a part of the first wiring hole. The position limiting groove is located in the second housing. In the circumferential direction of the pump housing, the width of the first wiring hole is smaller than the width of the second wiring hole. The drive device according to claim 1, characterized in that.

14. The rotor has magnetism. The stator includes a first stator unit and a second stator unit provided along the extending direction of the rotating shaft. Both the first stator unit and the second stator unit generate a rotating magnetic field for driving the rotor to rotate. Both the first stator unit and the second stator unit are fixedly connected to the pump housing. The rotating shaft is rotatably provided through the first stator unit and is provided at a distance from the second stator unit. Both the first stator unit and the second stator unit have a magnetic core. The magnetic core includes magnetic columns. The cross-section of the magnetic columns of the second stator unit is larger than the cross-section of the magnetic columns of the first stator unit. The drive device according to claim 1, characterized in that.

15. The rotor includes a first magnet and a second magnet. Both the first magnet and the second magnet are fixedly connected to the rotating shaft. In the extending direction of the rotating shaft, the second magnet is located between the first stator unit and the second stator unit. The first stator unit generates a rotating magnetic field for driving the first magnet to rotate. The second stator unit generates a rotating magnetic field for driving the second magnet to rotate. The conducting wire is connected to the first stator unit. The position of the isolation segment corresponds to at least the position of the second magnet. The drive device according to claim 14, characterized in that.

16. The rotor includes a flywheel, a first magnet, and a second magnet. The flywheel is fixedly connected to the rotating shaft. The flywheel is located between the first stator unit and the second stator unit. Both the first magnet and the second magnet are attached to the flywheel. The first stator unit generates a rotating magnetic field that drives the first magnet to rotate, and the second stator unit generates a rotating magnetic field that drives the second magnet to rotate. The drive device according to claim 14, characterized in that.

17. The flywheel includes a disk-shaped portion. The rotating shaft is fixedly provided to penetrate the disk-shaped portion. The first magnet and the second magnet are respectively provided on both sides of the disk-shaped portion that are separated from each other. Both the first magnet and the second magnet are annular Halbach array magnets. The first magnet includes a first magnetic body magnetized along the axial direction of the first magnet, and the second magnet includes a second magnetic body magnetized along the axial direction of the second magnet. The positions of the first magnetic body and the second magnetic body are opposite to each other. In the extending direction of the rotating shaft, the polarities of the first magnetic body and the second magnetic body on the side facing the disk-shaped portion are opposite. The drive device according to claim 16, characterized in that.

18. The rotating shaft has a connection end for connecting to the impeller. The rotor includes a first magnet and a second magnet. Both the first magnet and the second magnet are fixedly connected to the rotating shaft. The stator includes a first stator unit and a second stator unit provided along the extending direction of the rotating shaft. The first stator unit generates a rotating magnetic field that drives the first magnet to rotate, and the second stator unit generates a rotating magnetic field that drives 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 provided along the extending direction of the rotating shaft. The first magnet is close to the connection end of the rotating shaft. At least one of the first stator unit and the second stator unit is connected to the conducting wire. The isolation segment corresponds to the position of the second magnet. The drive device according to claim 1, characterized in that.

19. The stator includes a first stator unit and a second stator unit provided along the extending direction of the rotating shaft. The driving device further includes a shaft sleeve assembly fixed in the pump housing. The shaft sleeve assembly is located between the first stator unit and the impeller. The shaft sleeve assembly includes a first shaft sleeve and a second shaft sleeve. The first shaft sleeve is provided with a first insertion hole, a position limiting hole, and a first position limiting surface. The second shaft sleeve is provided with a second insertion hole and a second position limiting surface. The hole wall of the position limiting hole, the first position limiting surface, and the second position limiting surface jointly define a position limiting cavity. The rotating shaft includes a straight shaft portion and a flange portion. The straight shaft portion is provided to penetrate through the first insertion hole and the second insertion hole. The flange portion is accommodated in the position limiting cavity and is located between the first position limiting surface and the second position limiting surface. The driving device according to claim 1, characterized in that.

20. A blood pump including an impeller and a driving device for driving the impeller to rotate, wherein the driving device A pump housing having an accommodation cavity, and a first wiring hole, a second wiring hole, and a position limiting groove are further formed in the housing wall of the pump housing. Both the second wiring hole and the first wiring hole communicate with the accommodation cavity. The second wiring hole and the first wiring hole are provided at an interval. The position limiting groove is located outside the housing wall of the pump housing, and the position limiting groove is located between the pump housing between the first wiring hole and the second wiring hole, A rotating shaft configured to be connected to the impeller and rotatably attached to the pump housing, A rotor rotatably accommodated in the accommodation cavity, fixedly connected to the rotating shaft, and driving the rotating shaft to rotate, A stator accommodated in the accommodation cavity and driving the rotor to rotate, A conducting wire connected to the stator, the conducting wire being provided to penetrate through the first wiring hole and the second wiring hole, the conducting wire having an isolation segment corresponding to the position of the rotor, the isolation segment being located between the first wiring hole and the second wiring hole, at least a part of the isolation segment being restricted by the position restriction groove, and the groove wall of the position restriction groove being the conducting wire located between the rotor and the isolation segment, A cover body connected to the pump housing and completely covering the first wiring hole, the second wiring hole, the position restriction groove, and the isolation segment, The impeller is fixedly connected to the rotating shaft and is rotatable together with the rotating shaft. The blood pump is characterized by this.

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