Blood pump and its drive device

Abstract

A blood pump (100) and a drive device (10) thereof, the drive device (10) including a drive housing (11), a rotor (12), and a stator mechanism (13), the rotor (12) including a rotating shaft (121) and a first magnet (122), one end of the rotating shaft (121) being housed in the drive housing (11), the first magnet (122) being fixedly connected to the rotating shaft (121), and the stator mechanism (13). is housed within the drive housing (11), the stator mechanism (13) includes a drive stator (131), the drive stator (131) and the rotating shaft (121) are spaced apart along the axis of the rotating shaft (121), and the drive stator (131) is capable of generating a rotating magnetic field that interacts with the first magnet (122), thereby causing the first magnet (122) to move and rotate the rotating shaft (121).

Description

[Technical field]

[0001] (CROSS REFERENCE TO RELATED APPLICATIONS) This application claims priority to a Chinese patent application bearing application number 202111474226.1, 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. In this process, the power consumption of the drive unit is high, and the power consumption of the blood pump is also high. Summary of the Invention [Problem to be solved by the invention]

[0005] Based on this, the present invention provides a blood pump with low power consumption and a drive device thereof in order to reduce the power consumption of the blood pump. [Means for solving the problem]

[0006] a drive assembly including a drive housing, a rotor, and a stator mechanism; The rotor includes a rotating shaft having one end accommodated in the drive housing and a first magnet fixedly connected to the rotating shaft. The stator mechanism is contained within the drive housing, the stator mechanism including a drive stator, the drive stator and the rotating shaft being spaced apart along an axis of the rotating shaft, and the drive stator capable of generating a rotating magnetic field that interacts with the first magnet, thereby causing the first magnet to move the rotating shaft to rotate about the axis of the rotating shaft.

[0007] a drive unit including a drive housing, a rotor, and a stator mechanism; the rotor includes a rotating shaft, a first magnet, and a second magnet, the rotating shaft is rotatably mounted to the drive housing, and the first magnet and the second magnet are both 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 arranged along the axis of the rotating shaft, the drive stator and the rotating shaft are arranged at a distance along the axis of the rotating shaft, the drive stator is capable of generating a rotating magnetic field that drives rotation of the first magnet, the power stator is capable of generating a rotating magnetic field that drives rotation of the second magnet, the drive stator includes a first core and a first coil, the power stator includes a second core and a second coil, both of the first core and the second core include magnetic pillars, the first coil is wound around the magnetic pillar of the first core, the second coil is wound around the magnetic pillar of the second core, and a cross-sectional area of ​​the magnetic pillar of the first core is larger than a cross-sectional area of ​​the magnetic pillar of the second core.

[0008] A blood pump includes the drive device described above and an impeller fixedly connected to the rotating shaft and rotatable therewith.

[0009] 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.

[0010] 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]

[0011] [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 partial 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

[0012] 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.

[0013] 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.

[0014] 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.

[0015] To explain the technical solution of the present application, the following description refers to specific drawings and embodiments.

[0016] 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.

[0017] 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.

[0018] More specifically, the cannula assembly 20 has one end connected to the driving device 10, and 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 heart tissue. Specifically, the pigtail catheter 23 is 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, and a supply line is installed in the catheter assembly 40, and the supply line includes an infusion line 411 for passing an infusion liquid through the drive unit 10, and an electrical connection line for supplying power to the drive unit 10 and / or electrically connecting the drive unit 10 to an external electrical device (e.g., an external controller, etc.). Specifically, the infusion liquid may be, for example, saline, heparin-containing saline, glucose, etc.

[0020] The drive device 10 is rollingly connected to the impeller 30, and the drive device 10 is capable of moving and rotating the impeller 30. 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 impeller 30 is disposed outside the drive housing 11. The drive housing 11 has a communication port 110 located on the side of the drive housing 11 closer to the impeller 30. Specifically, the cannula assembly 20 and the catheter assembly 40 are fixedly connected to both ends of the drive housing 11, respectively, and the communication port 110 communicates the drive housing 11 with the cannula assembly 20. An injection line 411 in the catheter assembly 40 communicates with the drive housing 11. An injection liquid passed through the injection 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] Specifically, the drive housing 11 further includes a mating port 110a that is communicable with an infusion line 411 of the blood pump 100, such that infusion fluid flows through the drive housing 11 via the infusion line 411 and into the cannula assembly 20 through the communication port 110. In the illustrated embodiment, the catheter assembly 40 mates with the mating port 110a of the drive housing 11, and the infusion line 411 in the catheter assembly 40 is drilled into the mating port 110a together with the catheter assembly 40 and is partially contained within the drive housing 11.

[0023] The rotor 12 is rotatably attached within 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 first magnet 122, one end of the rotating shaft 121 is accommodated in the drive housing 11 and the other end is located outside the drive housing 11 and fixedly connected to the impeller 30, the rotating shaft 121 is rotatable with respect to the drive housing 11, and the first magnet 122 is fixedly connected to the rotating shaft 121. Specifically, the rotating shaft 121 is rotatably drilled into the communication port 110.

[0024] 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.

[0025] The stator mechanism 13 is accommodated in the drive housing 11, and the stator mechanism 13 can drive the rotor 12 to rotate. Here, the stator mechanism 13 includes a drive stator 131, and the drive 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 drive stator 131. The drive stator 131 can generate a rotating magnetic field that interacts with a first magnet 122, and the first magnet 122 can move the rotating shaft 121 to rotate around the axis of the rotating shaft 121, thereby moving and rotating the impeller 30. Specifically, the axis of the rotating shaft 121 is the rotation axis of the rotating shaft 121.

[0026] 4 and 5, specifically, the driving stator 131 includes a first back plate 1311, a plurality of first cores 1312, and a plurality of first coils 1313 wound around the first cores 1312. The first back plate 1311 is fixedly connected within the driving housing 11. The plurality of first cores 1312 are installed at intervals of one revolution around the axis of the rotating shaft 121. Specifically, the extension direction of each of the first cores 1312 is parallel to the axis of the rotating 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 in a direction close to the first magnet 122. The first coils 1313 can generate a rotating magnetic field that interacts with the first magnet 122, thereby causing the first magnet 122 to rotate, and moving and rotating the impeller 30.

[0027] 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.

[0028] In this embodiment, the driving device 10 further includes a fixed member 14 fixed in the driving housing 11, a positioning post 141 is installed 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.

[0029] Specifically, a through hole 142 is provided in the fixed member 14 , the through hole 142 communicates with the internal cavity of the drive housing 11 , and the through hole 142 is used to accommodate one end of the injection line 411 close to the impeller 30 .

[0030] According to the driving device 10 provided by the embodiment of the present invention, the driving stator 131 and the rotating shaft 121 are spaced apart in the axial direction, which makes it easy to set the core cross-sectional area of ​​the driving stator 131 to be large, and the larger the cross-sectional area of ​​the core, the larger the magnetic flux generated by the driving stator 131, the larger the torque to the first magnet 122, and the correspondingly smaller the current required when the driving stator 131 moves and rotates the rotating shaft 121, which is advantageous for reducing the power consumption of the entire blood pump 100 and reducing the amount of heat generated. Therefore, the blood pump 100 of the driving device 10 can have lower power consumption and less heat generation.

[0031] Furthermore, the rotor 12 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 is capable of generating a rotating magnetic field that interacts with 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.

[0032] In the illustrated embodiment, the first magnet 122 and the second magnet 123 are disposed between the driving stator 131 and the power stator 132. Specifically, the rotor 12 further includes a flywheel 124 fixedly connected to the rotating shaft 121, the flywheel 124 is located between the power stator 132 and the driving stator 131, and the first magnet 122 and the second magnet 123 are both installed on the flywheel 124.

[0033] Specifically, 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 into 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.

[0034] By installing the flywheel 124, it is possible to increase the connection strength between the magnet and the rotating shaft 121 and improve the rotational stability of the rotating shaft 121. In addition, by installing both the first magnet 122 and the second magnet 123 on the same flywheel 124, it is possible to reduce wobbling of the rotating shaft 121 during rotation and to make the rotating shaft 121 more stable during rotation.

[0035] 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.

[0036] 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.

[0037] 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 plurality of third magnet blocks 1222 magnetized in the circumferential direction and the plurality of 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, and 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.

[0038] 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 plurality of fourth magnet blocks 1232 and the plurality of 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.

[0039] 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.

[0040] 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.

[0041] In order to facilitate the installation of the first magnet 122 and the second magnet 123, the flywheel 124 is further provided with a marking portion 1243 for determining the installation position of the first magnet block 1221 and the installation 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 the first magnet block 1221 and the second magnet block 1231 are installed, the marking portion 1243 is used to mark the position of one of the first magnet block 1221 and one of the second magnet block 1231, so that the installation positions of the remaining magnet blocks can be determined, thereby facilitating the installation 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. Specifically, in the illustrated embodiment, the marking portion 1243 is provided on both end faces of the tubular portion 1242.

[0042] In one embodiment, the flywheel 124 is fixed to the rotating shaft 121 by adhesion. Referring to Figures 10 and 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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. By providing the tubular portion 1242, the flywheel 124 and the rotating shaft 121 can be connected more stably compared to the flywheel 124 having only the disk-shaped portion 1241.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] In this embodiment, the first core 1312 and the second core 1322 each have only a magnetic pillar, i.e., 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 to the first magnet 122, and the entire second core 1322 can be magnetically coupled to the second magnet 123. Compared with a core with pole pieces, the entire core of the present application which is a magnetic pillar 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.

[0051] 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. As shown in Fig. 12, 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.

[0052] 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. Or, in some embodiments, one of the first core 1312 and the second core 1322 simultaneously has a magnetic pillar and a head, and the other has only a magnetic pillar.

[0053] 3, 5 and 13, the drive unit 10 further includes a first bushing 15 fixedly connected to the drive housing 11, and the rotating shaft 121 is rotatably inserted into the first bushing 15. There is a gap between the rotating shaft 121 and the first bushing 15. By providing 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.

[0054] In order to facilitate fixing and mounting the first bushing 15 inside the drive housing 11, a first adhesive storage groove 152 is provided on the outer peripheral surface of the first bushing 15, and by providing the first adhesive storage groove 152 and by placing an adhesive in the first adhesive storage groove 152, it becomes easy to adhere the first bushing 15 and the drive housing 11 to each other.

[0055] 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 backwash injection solution passes through this gap, blood is prevented from entering the inside of the drive housing 11 through the communication port 110.

[0056] In order to prevent the injected liquid 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. Here, the material of the waterproof sealing membrane may be silica gel, a waterproof membrane formed by solidifying an adhesive, etc.

[0057] The drive unit 10 further includes a second bushing 16, the second bushing 16 is fixedly connected to the drive housing 11, the rotating shaft 121 is rotatably inserted in the second bushing 16, the second bushing 16 and the first bushing 15 are spaced apart from each other along the extension 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 rotational stability of the rotating shaft 121 can be improved.

[0058] 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.

[0059] Specifically, the first bushing 15 and the second bushing 16 are metal bushings, ceramic bushings, etc. Furthermore, both the first bushing 15 and the second bushing 16 are ceramic bushings, which have high corrosion resistance, a long service life, and are lightweight.

[0060] 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.

[0061] 3, 14 and 15, specifically, a first position restriction hole 111, a second position restriction hole 112 and a third position restriction hole 113 are arranged in sequence within the drive housing 11 along the axis of the rotating shaft 121, the second position restriction hole 112 is connected to the first position restriction hole 111, the third position restriction hole 113 is connected to the second position restriction hole 112, the hole diameter of the second position restriction hole 112 is smaller than the hole diameter of the first position restriction hole 111 and smaller than the hole diameter of the third position restriction hole 113, the first bushing 15 is accommodated in the first position restriction hole 111, the second bushing 16 is accommodated in the third position restriction hole 113, and the position restriction ring 125 is accommodated in the second position restriction 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.

[0062] 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.

[0063] Here, the injection liquid passed from the injection 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.

[0064] 13 again, 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.

[0065] 14 to 19, a guard 115 is fixedly installed in the drive housing 11, and a storage gap 114 is formed between the guard 115 and a side wall of the drive housing 11 to store the electric wire 17 connected to the power stator 132. Here, the electric wire 17 may be directly connected to an electric connection line of the supply line, or the electric wire 17 may be directly electrically connected to an external controller of the blood pump 100. The position of the guard 115 corresponds to the positions of the first magnet 122 and the second magnet 123, thereby separating the first magnet 122 and the second magnet 123 from the storage gap 114. By providing the storage gap 114, it is possible to prevent the electric wire 17 from coming into contact with the first magnet 122 and the second magnet 123 during the rotation of the rotor 12, and thus the electric wire 17 from rotating and twisting together with the magnets. In this embodiment, the first magnet 122 and the second magnet 123 are both mounted within the flywheel 124, and the guard 115 is installed between the flywheel 124 and the side wall of the drive housing 11. The guard 115 separates the flywheel 124 and the electric wire 17 to prevent the electric wire 17 from coming into contact with the flywheel 124 and becoming twisted or falling off.

[0066] Referring to FIG. 20 , in order to facilitate the attachment of the electrical wires 17 connecting the drive stator 131 and the power stator 132, the drive housing 11 is further provided with an attachment port 116, the drive housing 11 further includes a lid 117 for sealing the attachment port 116, the guard 115 covers a portion of the attachment port 116, and the storage gap 114 is formed between the lid 117 and the guard 115.

[0067] In addition, the method of preventing the electric wire 17 from rotating together with the magnet is not limited to the method of installing the guard 115. In some embodiments, a passage for drilling the electric wire 17 may be provided in the side wall of the direct drive housing 11, in which case there is no need to install the guard 115.

[0068] 21, the drive housing 11 includes a first housing 118 and a second housing 119 that abuts against the first housing 118, and the guard 115 and the mounting port 116 are both located on the second housing 119. By designing the drive housing 11 as a combination of multiple housings, the assembly of the internal components of the drive unit 10 can be facilitated.

[0069] In addition, the driving device 10 is not limited to the above structure, and in some embodiments, the driving device 10 has two flywheels, and the power stator 132 is located between the 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 driving stator 131, the first magnet 122 is fixed on the flywheel between the power stator 132 and the driving stator 131, and the second magnet 123 is fixed on the flywheel between the impeller 30 and the power stator 132. At this time, when the guard 115 is installed, the guard 115 is installed between the flywheel between the power stator 132 and the driving stator 131 and the driving housing 11, i.e., the position of the guard 115 corresponds to the position of the first magnet 122, and at this time, the guard 115 is located between the flywheel to which the first magnet 122 is attached and the electric wire 17. As will be appreciated, the rotor 12 may then have no flywheel, with the guard 115 then being located between the first magnet 122 and the electrical wire 17 .

[0070] Alternatively, in some embodiments, two flywheels are both located between the power stator 132 and the drive stator 131, and the two flywheels are used to mount the first magnet 122 and the second magnet 123, respectively. In this case, when the guard 115 is installed, the 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, the rotor 12 may not have a flywheel, and in this case, the 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.

[0071] In some embodiments, the blood pump 100 has only a drive stator 131 but no power stator 132, in which case the guard 115 does not need to be installed.

[0072] 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 apparatus comprising a drive housing, a rotor, and a stator mechanism, The rotor includes a rotating shaft having one end accommodated in the drive housing and a first magnet fixedly connected to the rotating shaft, the stator mechanism is contained within the drive housing, the stator mechanism including a drive stator, the drive stator and the rotating shaft being spaced apart along an axis of the rotating shaft, the drive stator capable of generating a rotating magnetic field that interacts with the first magnet such that the first magnet can move the rotating shaft to rotate about the axis of the rotating shaft; the stator mechanism further includes a power stator, the power stator and the drive stator are installed along an axis of the rotating shaft, the rotating shaft is rotatably inserted into the power stator, the rotor further includes a second magnet fixedly connected to the rotating shaft, and the power stator is capable of generating a rotating magnetic field that interacts with the second magnet; the drive stator includes a plurality of first cores and a plurality of first coils wound around the first cores, the first cores being spaced apart by one revolution around the axis of the rotating shaft; the power stator includes a plurality of second cores and a plurality of second coils wound around the second cores, the second cores being spaced apart by one revolution around the rotating shaft; A driving device characterized in that the first core and the second core both include a magnetic pillar, the first coil is wound around the magnetic pillar of the first core, the second coil is wound around the magnetic pillar of the second core, and a cross-sectional area of ​​the magnetic pillar of the first core is larger than a cross-sectional area of ​​the magnetic pillar of the second core.

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

3. 3. The flywheel according to claim 2, 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, one end of the rotating shaft remote from the impeller is fixedly accommodated in the tubular portion, and the first magnet and the second magnet are respectively installed on opposite sides of the disk-shaped portion. Drive unit.

4. 4. The drive device according to claim 3, 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.

5. 3. The drive device according to claim 2, wherein the flywheel includes a disk-shaped portion, the rotating shaft is fixedly inserted into the disk-shaped portion, 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 an axis of the first magnet, the second magnet includes a plurality of second magnet blocks whose magnetization direction is parallel to an 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 an extension 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.

6. 6. The drive device according to claim 5, wherein the flywheel is further provided with a marking portion for determining an attachment position of the first magnet block and an attachment position of the second magnet block.

7. 2. The drive device according to claim 1, wherein the first magnet is installed between the drive stator and the power stator, a guard is fixed inside the drive housing, and a storage gap capable of storing an electric wire connected to the power stator is formed between the guard and a side wall of the drive housing, a position of the guard corresponds to a position of the first magnet, and the guard is located between the first magnet and the electric wire.

8. The drive device according to claim 7, characterized in that the drive housing further includes a mounting port, the drive housing further includes a cover body for sealing the mounting port, the guard covers a portion of the mounting port, and the storage gap is formed between the cover body and the guard.

9. 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 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, in order to restrict the position of the rotating shaft in the extension direction of the rotating shaft.

10. 10. The drive device according to claim 9, wherein the first bushing is a metal bushing or a ceramic bushing, and / or the second bushing is a metal bushing or a ceramic bushing.

11. a first fluid groove is provided on a side of the first bushing close to the position restriction ring, the first fluid groove being in communication with a gap between the first bushing and the rotating shaft; And / or, a second fluid groove is provided on a side of the second bushing closer to the position limiting ring, and the second fluid groove is connected to a gap between the second bushing and the rotating shaft.

12. 2. The drive unit according to claim 1, characterized in that the drive housing has a communication port, 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.

13. 2. The drive device of claim 1, wherein the drive housing has a communication port and a mating port, the communication port being communicable with a cannula assembly for housing an impeller, and the mating port being communicable with an infusion line, whereby infusion fluid can flow through the drive housing through the infusion line and into the cannula assembly from the communication port.

14. The drive device described in claim 1, characterized in that the drive stator includes a first back plate, a plurality of first cores, and a plurality of first coils each wound around the first cores, the first back plate being fixedly connected to the drive housing, the plurality of first cores being installed at intervals of one revolution around the axis of the rotating shaft, one ends of the plurality of first cores are all fixedly connected to the first back plate, and the other ends extend in a direction closer to the first magnet.

15. The drive device according to claim 14, characterized in that the first back plate is provided with a positioning hole, the drive device further includes a fixed member fixed within the drive housing, the fixed member is provided with a positioning pillar, and the positioning pillar is drilled into the positioning hole.

16. 1. A drive apparatus including a drive housing, a rotor, and a stator mechanism, the rotor includes a rotating shaft, a first magnet, and a second magnet, the rotating shaft is rotatably mounted to the drive housing, and the first magnet and the second magnet are both 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 and the rotating shaft are disposed at a distance along the axis of the rotating shaft, the drive stator is capable of generating a rotating magnetic field that drives the rotation of the first magnet, the power stator is capable of generating a rotating magnetic field that drives the rotation of the second magnet, the drive stator includes a first core and a first coil, the power stator includes a second core and a second coil, both of the first core and the second core include a magnetic pillar, the first coil is wound around the magnetic pillar of the first core, the second coil is wound around the magnetic pillar of the second core, and a cross-sectional area of ​​the magnetic pillar of the first core is larger than a cross-sectional area of ​​the magnetic pillar of the second core. Drive unit.

17. A drive device comprising a drive housing, a rotor, and a stator mechanism, The rotor includes a rotating shaft having one end accommodated in the drive housing and a first magnet fixedly connected to the rotating shaft, the stator mechanism is contained within the drive housing, the stator mechanism including a drive stator, the drive stator and the rotating shaft being spaced apart along an axis of the rotating shaft, the drive stator capable of generating a rotating magnetic field that interacts with the first magnet such that the first magnet can move the rotating shaft to rotate about the axis of the rotating shaft; the stator mechanism further includes a power stator, the power stator and the drive stator are installed along an axis of the rotating shaft, the rotating shaft is rotatably inserted into the power stator, the rotor further includes a second magnet fixedly connected to the rotating shaft, and the power stator is capable of generating a rotating magnetic field that interacts with the second magnet; the rotor further includes a flywheel fixedly connected to the rotating shaft, the flywheel being located between the power stator and the drive stator, the first magnet and the second magnet both being installed 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, one end of the rotating shaft remote from the impeller is fixedly accommodated within 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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