Blood pump and its drive device

Abstract

A blood pump (100) and its drive (10), the drive (10) including a drive housing (11), a rotor (12), a stator mechanism (13), and electrical wires (17), the drive housing (11) having a partitioned mounting cavity (11a) and a storage cavity (114), the rotor (12) including a rotating shaft (121) and a magnetic assembly, the rotating shaft (121) being rotatable relative to the drive housing (11), the magnetic assembly being fixedly connected to the rotating shaft (121), and the stator (17). The mechanism (13) is accommodated in the mounting cavity (11a), the stator mechanism (13) is capable of generating a rotating magnetic field that drives rotation of the magnetic assembly, and the magnetic assembly can be rotated about the axis of the rotating shaft (121) by moving the rotating shaft (121), and a portion of the electric wire (17) located between the magnetic assembly and the drive housing (11) is accommodated in the storage cavity (114) so ​​that the cavity wall of the storage cavity (114) prevents contact between the electric wire (17) and the magnetic assembly.

Description

[Technical field]

[0001] (CROSS REFERENCE TO RELATED APPLICATIONS) This application claims priority to a Chinese patent application bearing application number 202111470871.6, filed with the State Intellectual Property Office of China on December 3, 2021, the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to the medical equipment technical field, and in particular to a blood pump and a drive device thereof. [Background technology]

[0003] An intravascular blood pump is a device configured to be percutaneously inserted into a patient's blood vessel and probed into the patient's heart as a left ventricular assist device or a right ventricular assist device; an intravascular blood pump is sometimes also referred to as an intracardiac blood pump.

[0004] A conventional blood pump mainly includes an impeller and a drive unit that drives the rotation of the impeller. The impeller transports blood from the blood inlet to the blood outlet of the blood pump by being driven by the drive unit. During this process, the failure (e.g., disconnection or detachment) of the electrical wires in the drive unit may affect the normal use of the blood pump. Summary of the Invention [Problem to be solved by the invention]

[0005] On this basis, the present invention provides a blood pump and its driving device, which can avoid the failure of the electric wires in the driving device and ensure the normal use of the blood pump. [Means for solving the problem]

[0006] a drive unit including a drive housing, a rotor, a stator mechanism, and electrical wires; The drive housing has a mounting cavity and a storage cavity separated from the mounting cavity, the rotor includes a rotating shaft having one end received in the mounting cavity and rotatable relative to the drive housing, and a magnetic assembly fixedly connected to the rotating shaft; the stator mechanism is received within the mounting cavity and is capable of generating a rotating magnetic field that drives rotation of the magnetic assembly, the magnetic assembly being capable of moving the rotary shaft to rotate about an axis of the rotary shaft; The electrical wire is electrically connected to the stator mechanism, a portion of the electrical wire is located between at least a portion of the magnetic assembly and the drive housing, and the portion of the electrical wire located between the magnetic assembly and the drive housing is housed in the storage cavity so as to prevent contact between the electrical wire and the magnetic assembly by a cavity wall of the storage cavity.

[0007] A blood pump includes the drive device described above and an impeller fixedly connected to the rotating shaft and rotatable together with the rotating shaft.

[0008] The details of one or more embodiments of the invention are set forth in the drawings and description which follow. Other features, objects, and advantages of the invention will become apparent from the description, drawings, and claims.

[0009] In order to more clearly describe the technical solutions in the embodiments of the present application, the following briefly introduces the drawings that need to be used in the description of the embodiments or prior art. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can further obtain other drawings based on these drawings without creative labor. [Brief description of the drawings]

[0010] [Figure 1] 1 is a structural schematic diagram of a blood pump according to an embodiment of the present invention; [Diagram 2] FIG. 2 is a schematic diagram showing a partial structure of the blood pump shown in FIG. [Diagram 3] FIG. 3 is a cross-sectional view of the blood pump shown in FIG. 2 along line AA. [Figure 4] 3 is a structural schematic diagram of the blood pump drive device shown in FIG. 2 without a drive housing. [Diagram 5] FIG. 5 is a cross-sectional view along line BB of the drive device shown in FIG. [Figure 6] FIG. 5 is a perspective view of a flywheel of the drive unit shown in FIG. 4. [Figure 7] 5 is an assembled perspective view of a flywheel, a first magnet, and a second magnet of the drive device shown in FIG. 4. [Figure 8] 8 is an exploded perspective view of the flywheel, the first magnet, and the second magnet shown in FIG. 7. [Figure 9] FIG. 8 is a front view of the flywheel, the first magnet, and the second magnet shown in FIG. [Figure 10] FIG. 10 is a cross-sectional view taken along CC of the flywheel, the first magnet, and the second magnet shown in FIG. 9. [Figure 11] FIG. 4 is a schematic diagram showing the structure of the rotating shaft shown in FIG. [Figure 12] 5 is a structural schematic diagram of a drive stator of the drive device shown in FIG. 4. [Figure 13] 5 is a structural schematic diagram of the drive unit shown in FIG. 4 from a different angle, with the drive housing omitted. FIG. [Figure 14] 2 is a structural schematic diagram of a drive housing of the blood pump shown in FIG. 1. [Figure 15] FIG. 15 is a cross-sectional view along DD of the drive housing shown in FIG. 14. [Figure 16] 16 is a partial enlarged view of a portion K of the drive housing shown in FIG. 15. [Figure 17] FIG. 2 is a structural schematic diagram of the blood pump shown in FIG. 1 without a cannula assembly and a catheter assembly. [Figure 18] FIG. 18 is a cross-sectional view along EE of the blood pump shown in FIG. 17. [Figure 19] FIG. 19 is a partially enlarged view of part L in FIG. [Figure 20] FIG. 15 is an exploded view of the drive housing shown in FIG. [Figure 21]FIG. 21 is another exploded view of the drive housing shown in FIG. 20. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] In order to make the objectives, technical solutions and advantages of the present application clearer and easier to understand, the present application will be described in more detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to interpret the present application, and do not limit the present application.

[0012] It should be noted that when an element is referred to as being "fixed" or "mounted" to another element, it may be directly connected to the other element or indirectly connected to 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.

[0013] Additionally, the terms "first" and "second" are used for descriptive purposes only and cannot be understood to indicate or imply a relative importance or number of the technical features depicted. Thus, a feature qualified with "first" or "second" can explicitly or implicitly include one or more of the feature. In the description of this application, "plurality" means two or more, unless otherwise expressly and specifically limited.

[0014] To explain the technical solution of the present application, the following description refers to specific drawings and embodiments.

[0015] 1 to 3, an embodiment of the present application provides a blood pump 100 including a drive unit 10, a cannula assembly 20, and an impeller 30. The cannula assembly 20 is connected to the drive unit 10, the impeller 30 is rotatably housed in the cannula assembly 20, and the impeller 30 is connected to the drive unit 10, and the drive unit 10 can move and rotate the impeller 30 to realize the pumping function of the blood pump 100.

[0016] Specifically, cannula assembly 20 has an inlet 21 and an outlet 22. In one embodiment, cannula assembly 20 extends through a heart valve, such as the aortic valve, with inlet 21 located within the heart and outlet 22 and driver 10 located outside the heart in a blood vessel, such as the aorta. As impeller 30 rotates, blood flows into cannula assembly 20 through inlet 21 and out of cannula assembly 20 through outlet 22.

[0017] More specifically, the cannula assembly 20 can be connected at one end to the drive unit 10 and at the other end can be provided with a pigtail catheter 23 for stabilizing the position of the blood pump 100 in the heart and providing atraumatic support to the cardiac tissue.

[0018] Specifically, the pigtail catheter 23 has a hollow structure. The material of the pigtail catheter 23 is at least one selected from the group consisting of polyurethane, nylon, polyethylene, polyether block polyamide PEBAX, and latex materials.

[0019] Furthermore, the blood pump 100 further includes a catheter assembly 40 connected to the drive unit 10, with supply lines installed within the catheter assembly 40, including a flushing line 411 for passing flushing fluid through the drive unit 10, and an electrical connection line for supplying power to the drive unit 10 and / or electrically connecting it to an external electrical device (e.g., an external controller, etc.).

[0020] The drive device 10 is rotatably connected to the impeller 30, and the drive device 10 can move and rotate the impeller 30 of the blood pump 100. Here, the drive device 10 includes a drive housing 11, a rotor 12, and a stator mechanism 13.

[0021] The drive housing 11 is substantially cylindrical. The drive housing 11 has a mounting cavity 11a. The impeller 30 is installed outside the drive housing 11. Here, the drive housing 11 has a communication port 110 communicating with the mounting cavity 11a, and the communication port 110 is located on the side of the drive housing 11 closer to the impeller 30. Specifically, the communication port 110 communicates between the drive housing 11 and the cannula assembly 20. Here, the cleaning fluid passed through the cleaning line 411 flows inside the drive housing 11 and flows into the cannula assembly 20 from the communication port 110, thereby preventing blood from permeating into the drive housing 11 from the communication port 110 of the drive housing 11.

[0022] The rotor 12 is rotatably mounted in the drive housing 11, the rotor 12 is fixedly connected to the impeller 30, and the rotor 12 can move and rotate the impeller 30. Here, the rotor 12 includes a rotating shaft 121 and a magnetic assembly fixedly connected to the rotating shaft 121. One end of the rotating shaft 121 is accommodated in the mounting cavity 11a, and the other end is located outside the drive housing 11 and fixedly connected to the impeller 30, and the rotating shaft 121 is rotatable with respect to the drive housing 11. Specifically, the rotating shaft 121 is rotatably drilled into the communication port 110. One end of the rotating shaft 121 to be connected to the impeller 30 extends from the communication port 110 to the outside of the drive housing 11.

[0023] Specifically, the rotating shaft 121 is made of a material such as ceramic or stainless steel to prevent breakage, for example, alumina-toughened zirconia (ATZ) or SUS316L.

[0024] The stator mechanism 13 is accommodated in the mounting cavity 11a, and the stator mechanism 13 can drive the rotor 12 to rotate. Specifically, the stator mechanism 13 can generate a rotating magnetic field that drives the rotation of the magnetic assembly, and the magnetic assembly can move the rotating shaft 121 to rotate about the axis of the rotating shaft 121. Here, the stator mechanism 13 includes a driving stator 131, and the driving stator 131 and the rotating shaft 121 are spaced apart along the axis of the rotating shaft 121, i.e., the rotating shaft 121 is not drilled into the driving stator 131. The magnetic assembly includes a first magnet 122 fixedly connected to the rotating shaft 121, and the driving stator 131 can generate a rotating magnetic field that interacts with the first magnet 122, which can move the rotating shaft 121 to rotate about the axis of the rotating shaft 121, thereby moving and rotating the impeller 30.

[0025] 4 and 5, specifically, the drive stator 131 includes a first back plate 1311, a plurality of first cores 1312, and a plurality of first coils 1313 respectively arranged around the plurality of first cores 1312. The first back plate 1311 is fixedly connected within the drive housing 11. The plurality of first cores 1312 are arranged around the axis of the rotation shaft 121 at intervals of one revolution. Specifically, the extension direction of each of the first cores 1312 is parallel to the extension direction of the rotation shaft 121. One end of each of the first cores 1312 is fixedly connected to the first back plate 1311, and the other end extends until close to the first magnet 122. The first coil 1313 can generate a rotating magnetic field that interacts with the first magnet 122, thereby causing the first magnet 122 to rotate, moving and rotating the rotating shaft 121 and causing the impeller 30 to rotate with the rotating shaft 121.

[0026] In some embodiments, the driving stator 131 may not have the first backplate 1311. The first backplate 1311 functions as a closed magnetic path, promoting and increasing the generation of magnetic flux in the driving stator 131, and improving the coupling ability. Since the first backplate 1311 can increase the magnetic flux, it is advantageous to reduce the diameter of the entire blood pump 100 by installing the first backplate 1311. The first backplate 1311 is made of the same material as the first core 1312, and in some embodiments, both the first backplate 1311 and the first core 1312 are made of a soft magnetic material such as cobalt steel.

[0027] In this embodiment, the driving device 10 further includes a fixed member 14 fixed in the driving housing 11, a positioning post 141 is provided on the fixed member 14, and a positioning hole 13111 is provided in the first back plate 1311, and the positioning post 141 is drilled into the positioning hole 13111, thereby facilitating the positioning and installation of the driving stator 131. Here, the axis of the positioning post 141 overlaps with the axis of the rotating shaft 121.

[0028] Specifically, the fixed member 14 has a through hole 142 which communicates with the internal cavity of the drive housing 11 and is used to accommodate one end of the cleaning line 411 close to the impeller 30 .

[0029] Furthermore, the magnetic assembly further includes a second magnet 123 fixedly connected to the rotating shaft 121, and the stator mechanism 13 further includes a power stator 132, the power stator 132 and the drive stator 131 are installed along the axis of the rotating shaft 121, and the power stator 132 is closer to the impeller 30 than the drive stator 131, i.e., in the extending direction of the rotating shaft 121, the power stator 132 is disposed between the impeller 30 and the drive stator 131. Here, the rotating shaft 121 is rotatably inserted into the power stator 132, and the power stator 132 can generate a rotating magnetic field that drives the rotation of the second magnet 123. The drive stator 131 and the power stator 132 can drive the rotation of the first magnet 122 and the second magnet 123, respectively, so that the drive stator 131 and the power stator 132 can jointly move the rotating shaft 121 to rotate about the axis of the rotating shaft 121, thereby moving and rotating the impeller 30, and providing a greater driving force for the rotation of the impeller 30.

[0030] In the illustrated embodiment, the first magnet 122 and the second magnet 123 are disposed between the drive stator 131 and the power stator 132. Specifically, the magnetic assembly further includes a flywheel 124 fixedly connected to the rotating shaft 121, the flywheel 124 being located between the power stator 132 and the drive stator 131, and the first magnet 122 and the second magnet 123 being both disposed on the flywheel 124.

[0031] 2 and 3, one end of the rotating shaft 121 remote from the impeller 30 is a first end 1211, and one end of the rotating shaft 121 close to the impeller 30 is a second end 1212. The flywheel 124 is fixedly fitted to the first end 1211 of the rotating shaft 121. Here, the flywheel 124 may be integrally formed with the rotating shaft 121, or may be fixed to the rotating shaft 121 by a method such as adhesion or welding.

[0032] By installing the flywheel 124, the connection strength between the magnet and the rotating shaft 121 can be increased, improving the rotational stability of the rotating shaft 121. Also, by installing both the first magnet 122 and the second magnet 123 on the same flywheel 124, the wobbling of the rotating shaft 121 during rotation can be reduced, making the rotating shaft 121 more stable during rotation.

[0033] More specifically, referring to FIG. 6 , the flywheel 124 includes a disk-shaped portion 1241 and a tubular portion 1242, the tubular portion 1242 is fixedly drilled into the center of the disk-shaped portion 1241 and is coaxial with the disk-shaped portion 1241, one end of the rotating shaft 121 remote from the impeller 30 (i.e., the first end 1211) is fixedly accommodated within the tubular portion 1242, and the first magnet 122 and the second magnet 123 are respectively installed on opposite sides of the disk-shaped portion 1241, thereby facilitating assembly of the first magnet 122 and the second magnet 123 and better fixing the first magnet 122 and the second magnet 123 to the rotating shaft 121.

[0034] 7 to 10, specifically, the first magnet 122 and the second magnet 123 are both ring-shaped Halbach array magnets. The first magnet 122 includes a plurality of first magnet blocks 1221 whose magnetization direction is parallel to the axis of the first magnet 122, and the second magnet 123 includes a plurality of second magnet blocks 1231 whose magnetization direction is parallel to the axis of the second magnet 123, and the plurality of second magnet blocks 1231 and the plurality of first magnet blocks 1221 are respectively installed on opposite sides of the disk-shaped portion 1241 around the rotation shaft 121. In the extension direction of the rotation shaft 121, each second magnet block 1231 is installed opposite to one first magnet block 1221, and the polarities of the sides facing the disk-shaped portion 1241 of the second magnet block 1231 and the first magnet block 1221 installed opposite to each other are opposite to each other. By installing them in this manner, it is possible to easily attach the first magnet 122 and the second magnet 123, and to avoid the problem of the magnet block of the first magnet 122 and the magnet block of the second magnet 123 repelling each other, making assembly difficult.

[0035] In some embodiments, the first magnet 122 further includes a plurality of third magnet blocks 1222 magnetized along the circumferential direction of the first magnet 122, and the third magnet blocks 1222 magnetized in the circumferential direction and the first magnet blocks 1221 magnetized parallel to the axis of the first magnet 122 are alternately arranged along the circumference on which the first magnet 122 is located. Here, the magnetization directions of adjacent first magnet blocks 1221 are opposite to each other, for example, the magnetization direction of one of the adjacent first magnets 122 is from the side away from the disk-shaped portion 1241 of the first magnet block 1221 to the side toward the disk-shaped portion 1241, and the magnetization direction of the other is from the side toward the disk-shaped portion 1241 of the first magnet block 1221 to the side away from the disk-shaped portion 1241. The magnetization directions of adjacent third magnet blocks 1222 are opposite to each other on the circumference on which the first magnet 122 is located.

[0036] Correspondingly, the second magnet 123 further includes a plurality of fourth magnet blocks 1232 magnetized along the circumferential direction of the second magnet 123, and the fourth magnet blocks 1232 and the second magnet blocks 1231 are alternately installed along the circumference on which the second magnet 123 is located. Here, the magnetization directions of adjacent second magnet blocks 1231 are opposite, and the magnetization directions of adjacent fourth magnet blocks 1232 are opposite on the circumference on which the second magnet 123 is located.

[0037] In addition, the magnetization direction of the third magnet block 1222 and the fourth magnet block 1232 is not limited to circumferential magnetization, and in some embodiments, the magnetization direction of the third magnet block 1222 and the fourth magnet block 1232 may be inclined with respect to the axis of the rotation shaft 121.

[0038] In this embodiment, the first magnet 122 and the second magnet 123 each have eight magnet blocks, that is, the first magnet block 1221, the second magnet block 1231, the third magnet block 1222 and the fourth magnet block 1232 each have four magnet blocks. The first magnet block 1221, the second magnet block 1231, the third magnet block 1222 and the fourth magnet block 1232 are all ring-shaped sector magnets, and the first magnet 122 and the second magnet 123 have a substantially circular ring structure. It is understood that in other embodiments, the first magnet 122 and the second magnet 123 may be composed of more or less magnet blocks, such as two, four, six or ten.

[0039] In order to facilitate the attachment of the first magnet 122 and the second magnet 123, the flywheel 124 is further provided with a marking portion 1243 for determining the attachment position of the first magnet block 1221 and the attachment position of the second magnet block 1231. The marking portion 1243 may be provided as a groove, a scale line, a marking, or the like. When attaching the first magnet block 1221 and the second magnet block 1231, if the position of one of the first magnet block 1221 and one of the second magnet block 1231 is marked using the marking portion 1243, the attachment positions of the remaining magnet blocks can be determined, thereby facilitating the attachment of the first magnet 122 and the second magnet 123. Specifically, the marking portion 1243 may be provided on at least one of the tubular portion 1242 and the disk-shaped portion 1241.

[0040] In one embodiment, the flywheel 124 is fixed to the rotating shaft 121 by adhesion. Referring to Fig. 11, an adhesive groove 1213 is provided at the end of the first end 1211 of the rotating shaft 121, and a stopper protrusion 12421 is provided on the inner wall of the tubular part 1242 to abut against the adhesive groove 1213. By disposing adhesive in the adhesive groove 1213 in this manner, it is possible to easily securely connect the rotating shaft 121 and the stopper protrusion 12421.

[0041] Furthermore, the adhesive groove 1213 extends along an axial direction perpendicular to the rotating shaft 121, and the end of the adhesive groove 1213 extends to the outer circumferential surface of the rotating shaft 121. By installing in this manner, when adhesive is placed in the adhesive groove 1213, the adhesive overflows onto the outer circumferential surface of the rotating shaft 121, and adheres to the inner circumferential wall of the tubular portion 1242 and the circumferential surface of the rotating shaft 121, thereby better fixing the rotating shaft 121 and the flywheel 124, or it is easy for excess adhesive to overflow into the adhesive groove 1213 for adhering the rotating shaft 121 and the tubular portion 1242 together.

[0042] 6 to 10, in this embodiment, the flywheel 124 further includes an outer peripheral wall 1244 disposed around the disk-shaped portion 1241, and the outer peripheral wall 1244, the tubular portion 1242, and the disk-shaped portion 1241 together surround a first storage section and a second storage section that respectively store the first magnet 122 and the second magnet 123, and the first storage section and the second storage section are partitioned by the disk-shaped portion 1241. By disposing in this manner, the positions of the first magnet 122 and the second magnet 123 can be restricted, which not only makes it easier to attach the first magnet 122 and the second magnet 123, but also makes the connection between the first magnet 122 and the second magnet 123 and the flywheel 124 stronger.

[0043] In this embodiment, in the axial direction of the tubular portion 1242, the side of the first magnet 122 away from the disk-shaped portion 1241 is higher by a certain distance than the outer peripheral wall 1244, and the side of the second magnet 123 away from the disk-shaped portion 1241 is higher by a certain distance than the outer peripheral wall 1244, making it easier to assemble the first magnet 122 and the second magnet 123 to the flywheel 124.

[0044] The flywheel 124 is not limited to the above structure, and in some embodiments, the flywheel 124 does not have the outer peripheral wall 1244, and in some embodiments, the flywheel 124 does not have the outer peripheral wall 1244 and the tubular portion 1242, and in this case, the rotating shaft 121 is fixedly provided in the disk-shaped portion 1241, for example, in the center of the disk-shaped portion 1241. Compared with the flywheel 124 having only the disk-shaped portion 1241, the provision of the tubular portion 1242 allows the flywheel 124 and the rotating shaft 121 to be connected more stably.

[0045] The structure of the power stator 132 is similar to that of the drive stator 131. Here, the power stator 132 includes a second back plate 1321, a plurality of second cores 1322, and a plurality of second coils 1323. The plurality of second cores 1322 are arranged at intervals of one revolution around the rotating shaft 121, and the extension direction of each of the second cores 1322 is parallel to the axis of the rotating shaft 121. One end of each of the second cores 1322 is fixedly connected to the second back plate 1321, and the other end extends until it is close to the second magnet 123. In other words, the drive stator 131 and the power stator 132 are arranged in the opposite direction in the axial direction of the rotating shaft 121. Each of the second coils 1323 is wound around the corresponding second core 1322. The second coils 1323 can generate a rotating magnetic field that interacts with the second magnet 123.

[0046] Here, the first core 1312 and the second core 1322 include magnetic pillars, the first coil 1313 is wound on the magnetic pillar of the first core 1312, and the second coil 1323 is wound on the magnetic pillar of the second core 1322. The cross-sectional area of ​​the magnetic pillar of the first core 1312 is larger than the cross-sectional area of ​​the magnetic pillar of the second core 1322.

[0047] The larger the cross-sectional area of ​​the magnetic pillar, the larger the generated magnetic flux, the larger the torque on the stator magnet, and the smaller the required current, which is advantageous for reducing power consumption and heat generation. Since the rotating shaft 121 penetrates the center of the power stator 132, the cross-sectional area of ​​the second core 1322 is limited due to the constraints of the radial dimensions of the blood pump 100, while since the rotating shaft 121 does not penetrate the center of the drive stator 131, a first core 1312 with a large cross-sectional area can be selected. In other words, by installing in this manner, power consumption and heat generation of the drive unit 10 can be reduced.

[0048] 12 and 13, in this embodiment, the first core 1312 and the second core 1322 each have only a magnetic column, that is, the first core 1312 and the second core 1322 each have no wide head (i.e., pole piece), and the width of the first core 1312 and the second core 1322 is constant in the length direction, and the entire first core 1312 can be magnetically coupled with the first magnet 122, and the entire second core 1322 can be magnetically coupled with the second magnet 123. Compared with a core with pole pieces, this application can reduce magnetic loss and increase the magnetic coupling density between the first core 1312 and the first magnet 122 and between the second core 1322 and the second magnet 123, thereby increasing the torque of the driving stator 131 to the first magnet 122 (under equal current conditions) and the torque of the power stator 132 to the second magnet 123 (under equal current conditions). In addition, the first core 1312 and the second core 1322, which do not have heads, can significantly reduce the problem of power reduction in the motor due to local magnetic short circuits caused by contact between adjacent cores.

[0049] The cross-sectional shape of the first core 1312 and the second core 1322 having only a magnetic pillar may be a sector, a circle, a trapezoid, a ring sector, etc. In the illustrated embodiment, the first core 1312 and the second core 1322 having only a magnetic pillar are substantially triangular prism-shaped, and one side of each core faces the axis of the rotation shaft 121. In this embodiment, both sides of the first core 1312 and the second core 1322 are rounded, which makes it easier to wind the coil thereafter and is advantageous in protecting the insulating material coated on the coil.

[0050] As will be appreciated, in other embodiments, the first core 1312 and the second core 1322 may further include a head disposed at one end of the magnetic pillar, with the first backplate 1311 being joined to one end of the magnetic pillar of the first core 1312 remote from the head, and the second backplate 1321 being joined to one end of the magnetic pillar of the second core 1322 remote from the head. Alternatively, in some embodiments, one of the first core 1312 and the second core 1322 may simultaneously have a magnetic pillar and a head, and the other may only have a magnetic pillar.

[0051] 3, 5 and 13, the drive device 10 further includes a first bushing 15 accommodated in the mounting cavity 11a, the first bushing 15 is fixedly connected to the drive housing 11, and the rotating shaft 121 is rotatably mounted in the first bushing 15. Here, there is a gap between the rotating shaft 121 and the first bushing 15. By installing the first bushing 15, the dimensional requirements for the assembly of the rotating shaft 121 and the drive housing 11 can be reduced, and the rotational friction of the rotating shaft 121 can be reduced. In order to facilitate the fixed mounting of the first bushing 15 in the drive housing 11, a first adhesive receiving groove 152 is provided on the outer circumferential surface of the first bushing 15.

[0052] In this embodiment, the first bushing 15 is installed in the communication port 110, and the gap between the first bushing 15 and the rotating shaft 121 is 2 μm or less. Since the smallest red blood cells (diameter approximately 8 μm, thickness approximately 2 μm) have difficulty entering a gap with a width of 2 μm or less, and the cleaning fluid for backwashing passes through this gap, blood is prevented from entering the inside of the drive housing 11 through the communication port 110.

[0053] Specifically, the flushing fluid may be, for example, saline, heparinized saline, or dextrose.

[0054] In order to avoid the cleaning fluid from being contaminated and / or the elements in the drive unit 10 from being corroded, the drive stator 131 and the power stator 132 of the drive unit 10 are both covered with a waterproof sealing membrane, where the material of the waterproof sealing membrane may be silica gel, adhesive, etc.

[0055] The drive unit 10 further includes a second bushing 16 accommodated in the mounting cavity 11a, the second bushing 16 is fixedly connected to the drive housing 11, the rotating shaft 121 is drilled in the second bushing 16 with a gap therebetween, the rotating shaft 121 is rotatable within the second bushing 16, the second bushing 16 and the first bushing 15 are installed at an interval along the extending direction of the rotating shaft 121, and the first bushing 15 is closer to the impeller 30 than the second bushing 16. By installing the first bushing 15 and then adding the second bushing 16, the rotation stability of the rotating shaft 121 can be improved.

[0056] In order to facilitate the fixing and mounting of the second bushing 16 in the drive housing 11, a second adhesive receiving groove 162 is provided on the outer circumferential surface of the second bushing 16. By providing the second adhesive receiving groove 162, it becomes easier to adhere the second bushing 16 and the drive housing 11 together by placing an adhesive in the first adhesive receiving groove 152.

[0057] Specifically, the first bushing 15 and the second bushing 16 are made of a metal material, a ceramic material, or the like.

[0058] 3, 5 and 13, in this embodiment, the rotor 12 further includes a position limiting ring 125 fixedly fitted on the rotating shaft 121. Here, the position limiting ring 125 may be integrally formed with the rotating shaft 121, or may be fixed to the rotating shaft 121 by a method such as adhesion or welding. The position limiting ring 125 is located between the first bushing 15 and the second bushing 16, and the outer diameter of the position limiting ring 125 is larger than the inner diameter of the first bushing 15 and is also larger than the inner diameter of the second bushing 16, thereby limiting the position of the rotating shaft 121 in the extending direction of the rotating shaft 121 and preventing the rotating shaft 121 from moving significantly relative to the drive housing 11 in the extending direction of the rotating shaft 121.

[0059] 3, 14 and 15, specifically, within the mounting cavity 11a, a first position control hole 111, a second position control hole 112 and a third position control hole 113 are arranged sequentially along the axis of the rotating shaft 121, the second position control hole 112 is connected to the first position control hole 111, the third position control hole 113 is connected to the second position control hole 112, the hole diameter of the second position control hole 112 is smaller than the hole diameter of the first position control hole 111 and smaller than the hole diameter of the third position control hole 113, the first bushing 15 is accommodated in the first position control hole 111, the second bushing 16 is accommodated in the third position control hole 113, and the position control ring 125 is accommodated in the second position control hole 112. By providing the first position restriction hole 111, the second position restriction hole 112, and the third position restriction hole 113, the positions of the first bushing 15 and the second bushing 16 can be restricted in the axial direction of the rotating shaft 121. Here, the communication hole 110 is an opening on the side of the first position restriction hole 111 away from the second position restriction hole 112.

[0060] In this embodiment, the position restriction ring 125 and the hole wall of the first position restriction hole 111 are fitted together with a gap.

[0061] Here, the cleaning fluid passed from the cleaning line 411 into the inside of the drive housing 11 flows through the gap between the second bushing 16 and the rotating shaft 121, the gap between the position control ring 125 and the first position control hole 111, and the gap between the first bushing 15 and the rotating shaft 121, and enters the cannula assembly 20 from the communication port 110, thereby not only performing the function of backwashing, but also performing the function of lubrication between the rotating shaft 121 and the first bushing 15, and between the rotating shaft 121 and the second bushing 16.

[0062] In this embodiment, a first fluid groove 153 is provided on the side of the first bushing 15 close to the position restriction ring 125, and the first fluid groove 153 communicates with the gap between the first bushing 15 and the rotating shaft 121. A second fluid groove 163 is provided on the side of the second bushing 16 close to the position restriction ring 125, and the second fluid groove 163 communicates with the gap between the second bushing 16 and the rotating shaft 121. In this way, the flow of the cleaning liquid is facilitated. Note that in other embodiments, a fluid groove may be provided in one of the first bushing 15 and the second bushing 16, or no fluid groove may be provided.

[0063] 14 to 20, the drive housing 11 further includes a storage cavity 114 separated from the mounting cavity 11a. The drive 11 further includes an electric wire 17, the electric wire 17 is connected to the stator mechanism 13, a portion of the electric wire 17 is located between at least a portion of the magnetic assembly and the drive housing 11, and the portion of the electric wire 17 located between the magnetic assembly and the drive housing 11 is housed in the storage cavity 114, whereby the cavity wall of the storage cavity 114 prevents contact between the electric wire 17 and the magnetic assembly. In the illustrated embodiment, the electric wire 17 is electrically connected to the power stator 132, specifically, the electric wire 17 is electrically connected to the second coil 1323 of the power stator 132. Here, there is an electric wire 17 between both the first magnet 122 and the drive housing 11 and between the second magnet 123 and the drive housing 11, and the portion of the electric wire 17 located between the first magnet 122 and the drive housing 11 and the portion of the electric wire 17 located between the second magnet 123 and the drive housing 11 are both housed in the storage cavity 114. The position of the magnetic assembly corresponds to the position of the storage cavity 114.

[0064] Here, the electric wire 17 may be directly electrically connected to an electric connection line in the supply line, or the electric wire 17 is connected to a control unit in the drive device 10, and the control unit is used to control the operating state of the stator mechanism 13. Specifically, the electric wire 17 has one end electrically connected to the second coil 1323, and the other end electrically connected directly to an electric connection line in the supply line or electrically connected to the control unit.

[0065] By installing the storage cavity 114, the electrical wire 17 electrically connected to the stator mechanism 13 is separated from the rotatable magnetic assembly, and the risk of failure such as the electrical wire 17 being disconnected or detached due to contact with the electrical wire 17 during rotation of the magnetic assembly and the electrical wire 17 rotating together with the magnetic assembly can be effectively avoided, thereby further ensuring the normal use of the blood pump 100.

[0066] Further, a guard 115 is fixedly provided within the drive housing 11, and the guard 115 divides the internal cavity of the drive housing 11 into the mounting cavity 11a and the storage cavity 114. The position of the guard 115 corresponds to the position of the magnetic assembly, i.e., the position of the guard 115 corresponds to the position of the first magnet 122 and the position of the second magnet 123. The guard 115 is located between the magnetic assembly and the electric wire 17, and the guard 115 prevents the electric wire 17 from contacting the magnetic assembly. In other words, the guard 115 divides the first magnet 122, the second magnet 123 and the flywheel 124 from the storage cavity 114.

[0067] Specifically, the guard 115 is provided with a communication hole 1151 that connects the mounting cavity 11a and the storage cavity 114 and through which the electrical wire 17 is drilled, so that the electrical wire 17 passes through the communication hole 1151 and is electrically connected to the stator mechanism 13 in the mounting cavity 11a.

[0068] In order to facilitate the installation of the electrical wires 17 connecting the drive stator 131 and the power stator 132, the drive housing 11 includes a housing body 11b and a sealing lid 117, and a mounting port 116 is further provided in the housing body 11b. The sealing lid 117 sealingly covers the mounting port 116, and the guard 115 shields a portion of the mounting port 116. At least a portion of the storage cavity 114 is formed by being jointly surrounded by the sealing lid 117 and the guard 115.

[0069] 21, drive housing 11 includes a first housing 118 and a second housing 119 abutting first housing 118, and guard 115 is located on second housing 119. Designing drive housing 11 as a combination of multiple housings can facilitate assembly of the internal components of drive unit 10.

[0070] In some embodiments, the storage cavity 114 is not limited to being formed by the manner of installing the guard 115, and in some embodiments, the storage cavity 114 may be a passage provided on the side wall of the direct drive housing 11 for drilling the electrical wires 17.

[0071] However, the driving device 10 is not limited to the above structure. In some embodiments, the driving device 10 has two flywheels, and the two flywheels are both installed between the power stator 132 and the driving stator 131, and the two flywheels are both fixedly connected to the rotating shaft 121 and arranged along the axis of the rotating shaft 121, and the first magnet 122 and the second magnet 123 are respectively attached to the two flywheels. At this time, the position of the storage cavity 114 corresponds to the first magnet 122 and the second magnet 123, and a guard 115 is installed between the flywheel to which the first magnet 122 is attached and the electric wire 17, and between the flywheel to which the second magnet 123 is attached and the electric wire 17. As can be understood, at this time, the rotor 12 may not have a flywheel, and at this time, a guard 115 is installed between the first magnet 122 and the electric wire 17, and between the second magnet 123 and the electric wire 17. Alternatively, there is one flywheel, which is used to mount one of the first magnet 122 and the second magnet 123.

[0072] Alternatively, the power stator 132 is located between two flywheels, i.e., one flywheel is located between the impeller 30 and the power stator 132, and the other flywheel is located between the power stator 132 and the drive stator 131, and the first magnet 122 is fixed on the flywheel between the power stator 132 and the drive stator 131, and the second magnet 123 is fixed on the flywheel between the impeller 30 and the power stator 132, i.e., the first magnet 122 is located between the power stator 132 and the drive stator 131, and the second magnet 123 is located between the impeller 30 and the power stator 132, with an electric wire 17 between the first magnet 122 and the drive housing 11. In order to avoid the electric wire 17 coming into contact with the first magnet 122 or the flywheel to which the first magnet 122 is attached, the portion of the electric wire 17 located between the first magnet 122 and the drive housing 11 is accommodated in the accommodation cavity 114. Correspondingly, the guard 115 is located between the flywheel to which the first magnet 122 is attached and the electric wire 17. As can be understood, the rotor 12 may then not have a flywheel, and the guard 115 is then located between the first magnet 122 and the electric wire 17.

[0073] Alternatively, in some embodiments, the rotating shaft 121 may be installed so as to be drilled into the driving stator 131, and the rotating shaft 121 may be drilled into the driving stator 131 and the power stator 132, and in this case, the entire magnetic assembly may be installed between the driving stator 131 and the power stator 132, and in this case, the installation manner of the storage cavity may be similar to that of Figures 18 to 21. Alternatively, the power stator 366 may be located between the first magnet 122 and the second magnet 123, or the driving stator 131 and the power stator 132 may both be located between the first magnet 122 and the second magnet 123, and in this case, there is an electric wire 17 between the first magnet 122 and the driving housing 11. In order to avoid the electric wire 17 coming into contact with the first magnet 122 or the flywheel to which the first magnet 122 is attached, the portion of the electric wire 17 located between the first magnet 122 and the drive housing 11 is accommodated in the accommodation cavity 114. Correspondingly, the guard 115 is located between the flywheel to which the first magnet 122 is attached and the electric wire 17. As can be understood, the rotor 12 may then not have a flywheel, and the guard 115 is then located between the first magnet 122 and the electric wire 17.

[0074] Alternatively, in some embodiments, the drive device 10 has only the power stator 132, the power stator 132 is capable of generating a rotating magnetic field that drives the rotation of the magnetic assembly, the electric wires 17 are electrically connected to the power stator 132, the rotating shaft 121 is rotatably inserted into the power stator 132, and the magnetic assembly is closer to one end of the rotating shaft 121 housed in the mounting cavity 11a than the power stator 132. In this case, the magnetic assembly has at least a magnet corresponding to the power stator 132, and the power stator 132 is capable of generating a rotating magnetic field that drives the rotation of the magnet.

[0075] The above examples are only used to explain the technical solutions of the present invention, and do not limit the technical solutions of the present invention. Although the present invention has been described in detail with reference to the above examples, those skilled in the art can still modify the technical solutions described in the above examples or replace some of the technical features with equivalents, and it should be understood that these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and all should be included in the protection scope of the present invention.

Claims

1. 1. A drive device including a drive housing, a rotor, a stator mechanism, and electrical wires, The drive housing has a mounting cavity and a storage cavity separated from the mounting cavity, the rotor includes a rotating shaft having one end received in the mounting cavity and rotatable relative to the drive housing, and a magnetic assembly fixedly connected to the rotating shaft; the stator mechanism is received within the mounting cavity and is capable of generating a rotating magnetic field that drives rotation of the magnetic assembly, the magnetic assembly being capable of moving the rotary shaft to rotate about an axis of the rotary shaft; the electrical wire is electrically connected to the stator mechanism, a portion of the electrical wire is located between at least a portion of the magnetic assembly and the drive housing, and the portion of the electrical wire located between the magnetic assembly and the drive housing is received in the storage cavity so as to prevent contact between the electrical wire and the magnetic assembly by a cavity wall of the storage cavity; the magnetic assembly includes a first magnet and a second magnet, both of which are fixedly connected to the rotating shaft; the stator mechanism includes a drive stator and a power stator, the drive stator and the power stator are disposed along an axis of the rotating shaft, the drive stator is capable of generating a rotating magnetic field that drives the rotation of the first magnet, and the power stator is capable of generating a rotating magnetic field that drives the rotation of the second magnet, the first magnet is located between the drive stator and the power stator, a portion of the electric wire is located between the first magnet and the drive housing, and the portion of the electric wire located between the first magnet and the drive housing is received in the storage cavity; A driving device characterized in that the driving stator includes a plurality of first cores and first coils arranged at intervals of one revolution around the axis of the rotating shaft, the power stator includes a plurality of second cores and second coils arranged at intervals of one revolution around the rotating shaft, the first cores and the second cores both include magnetic pillars, the first coils are wound around the magnetic pillars of the first cores, the second coils are wound around the magnetic pillars of the second cores, and a cross-sectional area of ​​the magnetic pillars of the first cores is larger than a cross-sectional area of ​​the magnetic pillars of the second cores.

2. 2. The drive device of claim 1, wherein the second magnet is located between the power stator and the first magnet, the electric wire is located between both the first magnet and the drive housing and between the second magnet and the drive housing, and the portion of the electric wire located between the first magnet and the drive housing and the portion of the electric wire located between the second magnet and the drive housing are both housed in the storage cavity.

3. 2. The drive device of claim 1, wherein the magnetic assembly further includes a flywheel fixedly connected to the rotating shaft, the flywheel being located between the drive stator and the power stator, and the first magnet and the second magnet are both mounted on the flywheel.

4. The flywheel includes a disk-shaped portion fixedly fitted to the rotating shaft, the first magnet and the second magnet are respectively installed on opposite sides of the disk-shaped portion, the first magnet and the second magnet are both annular Halbach array magnets, the first magnet includes a plurality of first magnet blocks whose magnetization direction is parallel to the axis of the first magnet, the second magnet includes a plurality of second magnet blocks whose magnetization direction is parallel to the axis of the second magnet, the plurality of second magnet blocks and the plurality of first magnet blocks are respectively installed on opposite sides of the disk-shaped portion around the rotating shaft, each of the second magnet blocks is installed opposite to one of the first magnet blocks in the extending direction of the rotating shaft, and the polarities of the sides of the first magnet block and the second magnet block facing the disk-shaped portion are opposite to each other.

4. The drive device according to claim 3.

5. 4. The drive device according to claim 3, wherein the flywheel includes a disk-shaped portion and a tubular portion, the tubular portion is fixedly provided in a central portion of the disk-shaped portion and is coaxial with the disk-shaped portion, the rotating shaft is fixedly connected to the tubular portion, and the first magnet and the second magnet are respectively installed on opposite sides of the disk-shaped portion.

6. 6. The drive device of claim 5, wherein the flywheel further includes an outer peripheral wall arranged around the disk-shaped portion, the outer peripheral wall, the tubular portion and the disk-shaped portion together enclose a first storage section and a second storage section that respectively house the first magnet and the second magnet, and the first storage section and the second storage section are separated by the disk-shaped portion.

7. The driving device described in claim 6, characterized in that, in the axial direction of the tubular portion, a side of the first magnet away from the disk-shaped portion is higher than the outer peripheral wall by a certain distance, and a side of the second magnet away from the disk-shaped portion is higher than the outer peripheral wall by a certain distance.

8. 2 . The drive device according to claim 1 , wherein the magnetic pillars of the first core and the second core are both triangular prism-shaped, and sides of the magnetic pillars are rounded.

9. 2. The drive device according to claim 1, wherein the rotating shaft is rotatably inserted into the power stator, and the drive stator and the rotating shaft are spaced apart from each other along an axis of the rotating shaft.

10. 2. The drive device of claim 1, wherein a guard is fixedly mounted inside the drive housing, the guard dividing the interior cavity of the drive housing into the mounting cavity and the storage cavity, the guard being positioned between the electrical wire and at least a portion of the magnetic assembly, and the guard preventing contact between the electrical wire and the magnetic assembly.

11. 11. The drive device according to claim 10, wherein the guard is provided with a through hole that communicates the mounting cavity with the storage cavity and through which the electric wire is drilled, and the electric wire passes through the through hole to be electrically connected to the stator mechanism in the mounting cavity.

12. The drive device of claim 10, wherein the drive housing includes a housing main body and a sealing lid, the housing main body further includes a mounting opening communicating with the mounting cavity, the sealing lid sealingly covers the mounting opening, and at least a portion of the storage cavity is formed by being jointly surrounded by the sealing lid and the guard.

13. 2. The drive device of claim 1, wherein the drive housing includes a plurality of housings, the plurality of housings being butted together in sequence to collectively enclose the mounting cavity.

14. 2. The drive device according to claim 1, further comprising a first bushing and a second bushing, the first bushing and the second bushing both being accommodated in the mounting cavity and fixedly connected to the drive housing, the rotating shaft being rotatably inserted into the first bushing and the second bushing, the rotor further comprising a position restriction ring fixedly fitted onto the rotating shaft, the position restriction ring being located between the first bushing and the second bushing, and an outer diameter of the position restriction ring being larger than an inner diameter of the first bushing and an inner diameter of the second bushing, respectively, so as to restrict the position of the rotating shaft in the extension direction of the rotating shaft.

15. The drive device of claim 14, characterized in that the mounting cavity has a first position restriction hole, a second position restriction hole, and a third position restriction hole arranged along the extension direction of the rotation shaft, the second position restriction hole communicating with the first position restriction hole, the third position restriction hole communicating with the second position restriction hole, the hole diameter of the second position restriction hole being smaller than the hole diameter of the first position restriction hole and smaller than the hole diameter of the third position restriction hole, the first bushing is accommodated in the first position restriction hole, the second bushing is accommodated in the third position restriction hole, and the position restriction ring is accommodated in the second position restriction hole.

16. 2. The drive unit of claim 1, wherein the drive housing further has a communication port communicating with the mounting cavity, one end of the rotating shaft extends from the communication port to the outside of the drive housing, the drive unit further includes a bushing fixedly connected to the drive housing, the bushing is installed in the communication port, the rotating shaft is rotatably inserted into the bushing, and a gap between the bushing and the rotating shaft is 2 μm or less.

17. A drive device comprising a drive housing, a rotor, a stator mechanism, and electrical wires, The drive housing has a mounting cavity and a storage cavity separated from the mounting cavity, the rotor includes a rotating shaft having one end received in the mounting cavity and rotatable relative to the drive housing, and a magnetic assembly fixedly connected to the rotating shaft; the stator mechanism is received within the mounting cavity and is capable of generating a rotating magnetic field that drives rotation of the magnetic assembly, the magnetic assembly being capable of moving the rotary shaft to rotate about an axis of the rotary shaft; the electrical wire is electrically connected to the stator mechanism, a portion of the electrical wire is located between at least a portion of the magnetic assembly and the drive housing, and the portion of the electrical wire located between the magnetic assembly and the drive housing is received in the storage cavity so as to prevent contact between the electrical wire and the magnetic assembly by a cavity wall of the storage cavity; the magnetic assembly includes a first magnet and a second magnet, both of which are fixedly connected to the rotating shaft; the stator mechanism includes a drive stator and a power stator, the drive stator and the power stator are disposed along an axis of the rotating shaft, the drive stator is capable of generating a rotating magnetic field that drives the rotation of the first magnet, and the power stator is capable of generating a rotating magnetic field that drives the rotation of the second magnet, the first magnet is located between the drive stator and the power stator, a portion of the electric wire is located between the first magnet and the drive housing, and the portion of the electric wire located between the first magnet and the drive housing is received in the storage cavity; the magnetic assembly further includes a flywheel fixedly connected to the rotating shaft, the flywheel being located between the drive stator and the power stator, the first magnet and the second magnet both being mounted on the flywheel; The flywheel includes a disk-shaped portion and a tubular portion, the tubular portion is fixedly provided in a central portion of the disk-shaped portion and is coaxial with the disk-shaped portion, the rotating shaft is fixedly connected to the tubular portion, the first magnet and the second magnet are respectively installed on opposite sides of the disk-shaped portion, The drive device characterized in that the flywheel further includes an outer peripheral wall arranged around the disk-shaped portion, the outer peripheral wall, the tubular portion and the disk-shaped portion together surround a first storage section and a second storage section which respectively house the first magnet and the second magnet, and the first storage section and the second storage section are separated by the disk-shaped portion.

18. A drive device according to any one of claims 1 to 17, an impeller fixedly connected to the rotating shaft and rotatable therewith.

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