Drive unit and blood pump

Abstract

A drive mechanism (30) and a blood pump (100), the drive mechanism (30) including a drive housing (32), a bushing assembly (34), a rotating shaft (35), a drive member (36), and a sensing assembly (40). The bushing assembly (34) is provided with a storage cavity (34a) and a detection port (34b) communicating with the storage cavity (34a), the detection port (34b) is located on an outer wall of the bushing assembly (34), the rotating shaft (35) is rotatably provided in the bushing assembly (34), the driving member (36) is capable of driving the rotation of the rotating shaft (35), the sensing assembly (40) includes a sensor (42), the sensor (42) includes a probe (422), the probe (422) is accommodated in the storage cavity (34a), the position of the probe (422) corresponds to the position of the detection port (34b), and the probe (422) is capable of detecting a fluid pressure outside the drive device (30).

Description

[Technical Field]

[0001] (CROSS-REFERENCE TO RELATED APPLICATIONS) This application claims priority to a Chinese patent application bearing application number 202111479375.7, 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 field of medical equipment technology, and in particular to a driving device and a blood pump. [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 and / or a right ventricular assist device, and an intravascular blood pump is also sometimes called an intracardiac blood pump. Current intravascular blood pumps are usually transported to a specific location through a blood vessel by a guide wire and perform their assist function at that specific location. To achieve this, a sensor can be installed in the blood pump to detect the location of the blood pump, but installing a sensor in the blood pump increases the size of the blood pump. Summary of the Invention [Problem to be solved by the invention]

[0004] Based on this, the present invention provides a drive unit and a blood pump that can detect the position of the blood pump more accurately and that are smaller in size. [Means for solving the problem]

[0005] a drive unit including a drive housing, a bushing assembly, a rotating shaft, a drive member, and a sensing assembly; the bushing assembly is fixedly connected to the drive housing, the bushing assembly is provided with a storage cavity and a detection port communicating with the storage cavity, the detection port being located on an outer wall of the bushing assembly; the rotation shaft is rotatably mounted on the bushing assembly, the drive member is attached to the drive housing and is capable of driving the rotation of the rotary shaft; The sensing assembly includes a sensor, the sensor including a probe, the probe is housed in the housing cavity, the position of the probe corresponds to the position of the detection port, and the probe is capable of detecting fluid pressure outside the drive device.

[0006] A blood pump includes a rotatable impeller and the drive device.

[0007] 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.

[0008] In order to more clearly explain 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 efforts. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a structural schematic diagram of a blood pump according to a first embodiment. FIG. [Figure 2] FIG. 2 is a structural schematic diagram of the blood pump shown in FIG. 1 , omitting a catheter assembly and a part of a cannula assembly. [Figure 3] FIG. 3 is a cross-sectional view taken along the line AA in FIG. 2. [Figure 4]FIG. 4 is a partial cross-sectional view of one embodiment of a blood pump, omitting the cannula assembly, impeller, drive member, drive housing, a portion of the rotating shaft, and a portion of the sensing assembly (the sensing assembly in the embodiment of FIG. 4 includes an enclosed tube). [Figure 5] FIG. 2 is a perspective structural schematic diagram of a bushing assembly of the blood pump shown in FIG. 1. [Figure 6] FIG. 6 is an exploded view of the bushing assembly shown in FIG. 5. [Figure 7] FIG. 6 is a cross-sectional view of the bushing assembly shown in FIG. 5. [Figure 8] 6 is a structural schematic diagram of a first bushing of the bushing assembly shown in FIG. 5. FIG. [Figure 9] 3 is a structural schematic diagram of the driving device of the blood pump shown in FIG. 2 from another angle. FIG. [Figure 10] FIG. 10 is a cross-sectional view taken along the line BB in FIG. 9. [Figure 11] FIG. 4 is a perspective structural schematic diagram of the magnetic assembly of the blood pump shown in FIG. 3. [Figure 12] FIG. 12 is an exploded view of the magnetic assembly shown in FIG. [Figure 13] FIG. 12 is a cross-sectional view of the magnetic assembly shown in FIG. [Figure 14] FIG. 4 is an enlarged view of part I in FIG. 3. [Figure 15] FIG. 10 is a partial schematic view of a blood pump according to a second embodiment. [Figure 16] FIG. 16 is a structural schematic diagram of the blood pump shown in FIG. 15 from another angle. [Figure 17] FIG. 17 is a cross-sectional view taken along CC in FIG. [Figure 18] FIG. 16 is a structural schematic diagram of a bushing assembly of the blood pump shown in FIG. 15. [Figure 19] FIG. 19 is an exploded view of the bushing assembly shown in FIG. 18. [Figure 20] FIG. 19 is a cross-sectional view of the bushing assembly shown in FIG. 18. [Figure 21] FIG. 10 is a partial schematic view of a blood pump according to a third embodiment. [Figure 22] FIG. 22 is a structural schematic diagram of the blood pump shown in FIG. 21 from another angle. [Figure 23] FIG. 23 is a cross-sectional view taken along the line DD in FIG. 22. [Figure 24] FIG. 22 is a structural schematic diagram of a bushing assembly of the blood pump shown in FIG. 21. [Figure 25] FIG. 25 is an exploded view of the bushing assembly shown in FIG. 24. [Figure 26] FIG. 25 is a cross-sectional view of the bushing assembly shown in FIG. 24. DETAILED DESCRIPTION OF THE INVENTION

[0010] 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 examples. It should be understood that the specific examples described herein are only used to interpret the present application, and are not intended to limit the present application.

[0011] 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.

[0012] Additionally, the terms "first" and "second" are used for descriptive purposes only and cannot be understood to indicate or imply relative importance or the number of technical features being depicted. Accordingly, a feature qualified by "first" or "second" may explicitly or implicitly include one or more of the feature. In the description of this application, "plurality" means two or more, unless expressly and specifically limited otherwise.

[0013] To explain the technical solution of the present application, the following description will be made with reference to specific drawings and examples.

[0014] 1 to 3, the blood pump 100 of the first embodiment is particularly an intravascular blood pump. The blood pump 100 includes a cannula assembly 10, an impeller 20, and a drive unit 30.

[0015] Cannula assembly 10 has an inlet 12 and an outlet 14. In one embodiment, in use, cannula assembly 10 extends through a heart valve, such as the aortic valve, with inlet 12 located within the heart and outlet 14 located within a blood vessel, such as the aorta, outside the heart. Specifically, in the illustrated embodiment, inlet 12 and outlet 14 are located adjacent opposite ends of cannula assembly 10.

[0016] Impeller 20 is rotatably received in cannula assembly 10. As impeller 20 rotates, blood enters cannula assembly 10 through inlet 12 and exits cannula assembly 10 through outlet 14. In the illustrated embodiment, impeller 20 is located at one end of cannula assembly 10 near outlet 14.

[0017] The driver 30 is fixedly connected to the cannula assembly 10. Specifically, the driver 30 is fixedly connected to one end of the cannula assembly 10 near the outlet 14. The driver 30 is rotatably connected to the impeller 20, and the driver 30 is capable of driving the impeller 20 to rotate.

[0018] In this embodiment, the drive device 30 includes a drive housing 32 , a bushing assembly 34 , a rotating shaft 35 , a drive member 36 , and a sensing assembly 40 .

[0019] The drive housing 32 is a generally tubular structure having two opposing open ends.

[0020] Bushing assembly 34 is fixedly connected to drive housing 32. Specifically, bushing assembly 34 is fixedly connected to one end of drive housing 32, and bushing assembly 34 is sealingly connected to drive housing 32, with cannula assembly 10 fixedly connected to bushing assembly 34. In the illustrated embodiment, bushing assembly 34 is located between cannula assembly 10 and drive housing 32. It will be appreciated that in other embodiments, cannula assembly 10 may be fixedly connected directly to drive housing 32, with bushing assembly 34 being at least partially housed within cannula assembly 10.

[0021] 4, the bushing assembly 34 is provided with a storage cavity 34a and a detection port 34b communicating with the storage cavity 34a, and the detection port 34b is located on the outer wall of the bushing assembly 34. Specifically, the detection port 34b is an opening of the storage cavity 34a. In the present application, the outer wall of the bushing assembly 34 includes the outer peripheral wall of the bushing assembly 34 and outer end faces of both ends in the axial direction of the bushing assembly 34. In other words, the detection port 34b may be located on the outer peripheral wall of the bushing assembly 34, or on the outer end faces of both ends of the bushing assembly 34, or may be partially located on the outer peripheral wall and partially located on the outer end faces of the bushing assembly 34.

[0022] Specifically, the location of detection port 34b is close to or corresponds to the location of outlet 14. In the illustrated embodiment, the location of detection port 34b corresponds to the location of outlet 14. Specifically, a portion of bushing assembly 34 is housed in cannula assembly 10, and detection port 34b is located on the portion of bushing assembly 34 housed in cannula assembly 10 and faces outlet 14.

[0023] Rotating shaft 35 is rotatably mounted in bushing assembly 34, with one end of rotating shaft 35 extending into drive housing 32 and the other end extending away from drive housing 32 and fixedly connected to impeller 20. Specifically, the end of rotating shaft 35 away from drive housing 32 extends into cannula assembly 10 and is fixedly connected to impeller 20. Here, rotating shaft 35 and bushing assembly 34 form a bearing structure.

[0024] In this embodiment, bushing assembly 34 includes a connecting sleeve 342 and a first bushing 344. Connection sleeve 342 is fixedly connected to drive housing 32, and first bushing 344 is fixedly connected to connection sleeve 342. Rotation shaft 35 is rotatably disposed in first bushing 344 and connection sleeve 342. Specifically, first bushing 344 has a first shaft hole 344a that communicates with connection sleeve 342. Rotation shaft 35 is rotatably disposed in first shaft hole 344a and connection sleeve 342. Here, first bushing 344 constitutes a first bearing together with rotation shaft 35. At least one of connection sleeve 342 and first bushing 344 is fixedly connected to cannula assembly 10.

[0025] Specifically, at least a portion of the storage cavity 34a is located on the first bushing 344, and at least a portion of the detection port 34b is located on the first bushing 344, or both the storage cavity 34a and the detection port 34b are located on the connecting sleeve 342. In the illustrated embodiment, the storage cavity 34a extends from the connecting sleeve 342 to the first bushing 344, and the detection port 34b is located on the first bushing 344. The first axial hole 344a is separated from the storage cavity 34a.

[0026] In the illustrated embodiment, both ends of the connection sleeve 342 are open, and the first bushing 344 and the drive housing 32 are fixedly connected to the two open ends of the connection sleeve 342, respectively, with the first bushing 344 communicating with the connection sleeve 342 and the drive housing 32 communicating with the connection sleeve 342. Specifically, one end of the connection sleeve 342 remote from the first bushing 344 is housed in the drive housing 32.

[0027] 5 to 8 , in the illustrated embodiment, the first bushing 344 includes a disk-shaped cap portion 3442 and a boss 3444. The cap portion 3442 has opposing first and second surfaces, and the boss 3444 is formed on the first surface of the cap portion 3442. The cap portion 3442 sealingly covers an opening at one end of the connection sleeve 342 remote from the drive housing 32. The first axial hole 344a extends from the end surface of the boss 3444 remote from the cap portion 3442 to the second surface of the cap portion 3442. The storage cavity 34a extends from the end surface of the connection sleeve 342 remote from the cap portion 3442 to the cap portion 3442, and the detection port 34b is located on the cap portion 3442. Specifically, the end of the boss 3444 remote from the cap portion 3442 is housed in the connection sleeve 342. The end of the connecting sleeve 342 remote from the cap portion 3442 is housed in the drive housing 32 .

[0028] Furthermore, the bushing assembly 34 further includes a second bushing 346, which is fixedly connected to the connecting sleeve 342. The second bushing 346 and the first bushing 344 are arranged along the axis of the rotating shaft 35. Here, the first bushing 344 is closer to the impeller 20 than the second bushing 346. The rotating shaft 35 is rotatably received in the second bushing 346, and the second bushing 346, together with the rotating shaft 35, constitutes a second bearing. By adding the second bushing 346 in addition to the first bushing 344, the rotational stability of the rotating shaft 35 can be improved. Specifically, a second shaft hole 346a is provided in the second bushing 346, and the rotating shaft 35 is rotatably received in the second shaft hole 346a. The second bushing 346 is housed in the connecting sleeve 342.

[0029] Specifically, the second bushing 346 and the connecting sleeve 342 are adhesively fixed together with an adhesive. In the illustrated embodiment, to facilitate fixing and attaching the second bushing 346 within the connecting sleeve 342, an adhesive groove 346b for accommodating adhesive is provided on the outer peripheral wall of the second bushing 346.

[0030] In one embodiment, the first bushing 344, the second bushing 346, and the rotating shaft 35 are all made of ceramic, which is more corrosion-resistant, has a longer service life, and is lighter in mass. As will be appreciated, in other embodiments, the first bushing 344, the second bushing 346, and the rotating shaft 35 may all be made of metal, or some of the first bushing 344, the second bushing 346, and the rotating shaft 35 may be made of ceramic and some of the first bushing 344, the second bushing 346, and the rotating shaft 35 may be made of metal, or other biocompatible materials may be used.

[0031] 4 again, in this embodiment, the rotating shaft 35 includes a shaft body 352 and a protruding ring 354 disposed around the shaft body 352 by one turn, the shaft body 352 is rotatably disposed in the first shaft hole 344a, the second shaft hole 346a, and the connecting sleeve 342, one end of the shaft body 352 extends into the drive housing 32, and the other end extends away from the drive housing 32 and is connected to the impeller 20, the protruding ring 354 is disposed between the first bushing 344 and the second bushing 346, and the outer diameter of the protruding ring 354 is larger than the diameter of the first shaft hole 344a and larger than the diameter of the second shaft hole 346a. This restricts the position of the rotating shaft 35 in the extending direction of the rotating shaft 35, preventing the rotating shaft 35 from moving significantly relative to the bushing assembly 34 in the extending direction. Specifically, one end of shaft body 352 remote from drive housing 32 extends into cannula assembly 10 and is fixedly connected to impeller 20 .

[0032] In this embodiment, a protrusion 3422 is provided on the inner wall of the connecting sleeve 342, and the protrusion 3422 is installed for one revolution around the axis of the rotating shaft 35. The protrusion 3422 is located between the first bushing 344 and the second bushing 346. The position of the convex ring 354 corresponds to the position of the protrusion 3422, and there is a gap between the convex ring 354 and the protrusion 3422.

[0033] It should be noted that the bushing assembly 34 is not limited to the above structure, and in other embodiments, the second bushing 346 of the bushing assembly 34 may be fixedly provided within the drive housing 32, or the second bushing 346 of the bushing assembly 34 may be partially housed in the connecting sleeve 342 and partially housed in the drive housing 32, or the second bushing 346 may not be installed at all. Alternatively, the bushing assembly 34 may have the structure of the bushing assembly in Figures 17 to 20 or the structure of the bushing assembly in Figures 23 to 26.

[0034] 3, 9 and 10, the drive member 36 is mounted within the drive housing 32, and the drive member 36 is capable of driving the rotation of the rotary shaft 35. Here, the impeller 20 is rotatable together with the rotary shaft 35.

[0035] Specifically, drive member 36 includes a drive stator 362 and a magnetic assembly 364, where drive stator 362 is fixedly connected to drive housing 32, magnetic assembly 364 includes a first magnet 3642 that is fixedly connected to rotating shaft 35, drive stator 362 is capable of generating a rotating magnetic field that drives first magnet 3642 to rotate about the axis of rotating shaft 35, and rotating shaft 35 is rotatable together with first magnet 3642. In the illustrated embodiment, magnetic assembly 364 is housed within drive housing 32.

[0036] Specifically, the drive stator 362 includes a plurality of first cores 3622 and a plurality of first coils 3624 wound around the first cores 3622. The plurality of first cores 3622 are arranged at intervals of one turn around the axis of the rotating shaft 35. Specifically, the extension direction of each of the first cores 3622 is parallel to the axis of the rotating shaft 35. The first coils 3624 can generate a rotating magnetic field that drives the rotation of the first magnets 3642 so that the rotating shaft 35 is moved and rotated, thereby moving and rotating the impeller 20.

[0037] In this embodiment, the drive stator 362 and the rotating shaft 35 are spaced apart along the axis of the rotating shaft 35; that is, the rotating shaft 35 does not extend into the drive stator 362. Spaced apart from the driving stator 362 in the axial direction, the drive stator 362 has a core with a larger cross-sectional area. The larger the core cross-sectional area, the greater the magnetic flux generated by the driving stator 362, which increases the torque acting on the first magnet 3642. This reduces the current required for the driving stator 362 to rotate the rotating shaft 35, thereby reducing the overall power consumption and heat generation of the blood pump 100. Therefore, the blood pump 100 employing the drive unit 30 can consume less power and generate less heat.

[0038] In this embodiment, the drive stator 362 further includes a first backplate 3625 fixedly connected to the drive housing 32, and each first core 3622 has one end fixedly connected to the first backplate 3625 and the other end extending close to the first magnet 3642. The first backplate 3625 functions as a closed magnetic path to promote and increase the generation of magnetic flux in the drive stator 362 and improve coupling capability. Because the first backplate 3625 can increase the amount of magnetic flux, installing the first backplate 3625 is advantageous for reducing the overall diameter of the blood pump 100.

[0039] Specifically, the first backplate 3625 is made of the same material as the first core 3622, and in some embodiments, the first backplate 3625 and the first core 3622 are both made of a soft magnetic material such as cobalt steel.

[0040] In this embodiment, the drive unit 30 further includes a fixed member 37 fixed in the drive housing 32, a positioning post 372 is installed on the fixed member 37, and a positioning hole 3625a is provided in the first back plate 3625, and the positioning post 372 is drilled into the positioning hole 3625a, thereby facilitating the positioning and installation of the drive stator 362. Here, the axis of the positioning post 372 overlaps with the axis of the rotation shaft 35.

[0041] It should be noted that in some embodiments, the drive stator 362 may not have the first backplate 3625 .

[0042] Specifically, the drive member 36 further includes a power stator 366 fixedly connected to the drive housing 32, and the power stator 366 and the drive stator 362 are disposed along the axis of the rotating shaft 35. The power stator 366 is closer to the impeller 20 than the drive stator 362. The rotating shaft 35 is rotatably mounted on the power stator 366, and the magnetic assembly 364 further includes a second magnet 3644 fixedly connected to the rotating shaft 35, and the power stator 366 is capable of generating a rotating magnetic field that drives the rotation of the second magnet 3644. That is, the drive stator 362 and the power stator 366 can drive the rotation of the first magnet 3642 and the second magnet 3644, respectively, and the drive stator 362 and the power stator 366 jointly move the rotating shaft 35 to rotate about the axis of the rotating shaft 35, thereby moving and rotating the impeller 20, and providing a greater driving force for the rotation of the impeller 20. Specifically, the first magnet 3642 is positioned between the drive stator 362 and the power stator 366, which facilitates interaction between the drive stator 362 and the first magnet 3642 to generate a rotating magnetic field that drives the rotation of the first magnet 3642.

[0043] In the illustrated embodiment, the structure of the power stator 366 is similar to that of the drive stator 362. The power stator 366 includes a second back plate 3662, a plurality of second cores 3664, and a second coil 3665. The second back plate 3662 is fixedly connected to at least one of the drive housing 32 and the bushing assembly 34. The plurality of second cores 3664 are arranged at intervals of one revolution around the rotation shaft 35. Specifically, the extension direction of each second core 3664 is parallel to the axis of the rotation shaft 35. One end of each second core 3664 is fixedly connected to the second back plate 3662, and the other end extends close to the second magnet 3644. Each second coil 3665 is wound around the corresponding second core 3664. The second coil 3665 is capable of generating a rotating magnetic field that drives the rotation of the second magnet 3644. As will be appreciated, the power stator 366 does not have to include the second backplate 3662 .

[0044] Specifically, the first core 3622 and the second core 3664 both include a magnetic pillar, the first coil 3624 is wound around the magnetic pillar of the first core 3622, and the second coil 3665 is wound around the magnetic pillar of the second core 3664, and the cross-sectional area of ​​the magnetic pillar of the first core 3622 is larger than the cross-sectional area of ​​the magnetic pillar of the second core 3664.

[0045] The larger the cross-sectional area of ​​the magnetic pillar, the greater the generated magnetic flux, the greater the torque on the magnet, and the smaller the required current, which is advantageous for reducing power consumption and heat generation. Because the rotating shaft 35 penetrates the center of the power stator 366, the cross-sectional area of ​​the second core 3664 is limited due to the constraints of the radial dimension of the blood pump 100. However, because the rotating shaft 35 does not penetrate the center of the drive stator 362, a first core 3622 with a large cross-sectional area can be selected. In other words, this installation reduces power consumption and heat generation of the drive unit 30.

[0046] In this embodiment, the first core 3622 and the second core 3664 each have only a magnetic pillar, i.e., neither the first core 3622 nor the second core 3664 has a wide head (i.e., a pole piece), and the width of the first core 3622 and the second core 3664 is constant along their length. The entire first core 3622 can be magnetically coupled to the first magnet 3642, and the entire second core 3664 can be magnetically coupled to the second magnet 3644. Compared with a core with pole pieces, the core of this application which is entirely a magnetic pillar reduces magnetic loss and increases the magnetic coupling density between the first core 3622 and the first magnet 3642 and between the second core 3664 and the second magnet 3644, thereby increasing the torque of the drive stator 362 relative to the first magnet 3642 (under equal current conditions) and the torque of the power stator 366 relative to the second magnet 3644 (under equal current conditions). Furthermore, the first core 3622 and the second core 3664 do not have heads, which can significantly reduce the problem of power reduction in the motor due to local magnetic short circuits caused by contact between adjacent cores.

[0047] The cross-sectional shape of the first core 3622 and the second core 3664, which have only a magnetic pillar, may be sectorial, circular, trapezoidal, triangular, or the like. In the illustrated embodiment, the first core 3622 and the second core 3664, which have only a magnetic pillar, are substantially triangular prisms, with one side of each core directed toward the axis of the rotation shaft 35. In this embodiment, the sides of the first core 3622 and the second core 3664 are all rounded. Rounding the sides facilitates subsequent coil winding and is advantageous for protecting the insulating material covering the coil.

[0048] As will be appreciated, in other embodiments, the first core 3622 and the second core 3664 may further include a head disposed at one end of the magnetic pillar, with the first backplate 3625 being joined to one end of the magnetic pillar of the first core 3622 remote from the head, and the second backplate 3662 being joined to one end of the magnetic pillar of the second core 3664 remote from the head. Alternatively, in some embodiments, one of the first core 3622 and the second core 3664 may simultaneously include a magnetic pillar and a head, while the other may only include a magnetic pillar.

[0049] In the illustrated embodiment, the first magnet 3642 and the second magnet 3644 are both located between the drive stator 362 and the power stator 366. From one end closer to the impeller 20 to one end farther from the impeller 20, the power stator 366, the second magnet 3644, the first magnet 3642, and the drive stator 362 are sequentially arranged along the axis of the rotation shaft 35.

[0050] In the illustrated embodiment, the magnetic assembly 364 further includes a flywheel 3645 fixedly connected to the rotating shaft 35. The flywheel 3645 is located between the power stator 366 and the drive stator 362, and both the first magnet 3642 and the second magnet 3644 are installed on the flywheel 3645. That is, the magnetic assembly 364 is located between the power stator 366 and the drive stator 362. Installing the flywheel 3645 increases the connection strength between the magnets and the rotating shaft 35, thereby improving the rotational stability of the rotating shaft 35. Furthermore, installing the first magnet 3642 and the second magnet 3644 on the same flywheel 3645 reduces wobble during rotation of the rotating shaft 35, making the rotating shaft 35 more stable during rotation and simplifying the structure of the drive unit 30.

[0051] Here, the flywheel 3645 may be integrally molded with the rotary shaft 35, or the flywheel 3645 may be fixed to the rotary shaft 35 by adhesive, welding, or the like.

[0052] Referring also to Figures 11 to 13, in the illustrated embodiment, the flywheel 3645 includes a disk-shaped portion 3645a and a tubular portion 3645b, the tubular portion 3645b is fixedly drilled in the center of the disk-shaped portion 3645a and is coaxial with the disk-shaped portion 3645a, one end of the rotating shaft 35 away from the impeller 20 is fixedly accommodated within the tubular portion 3645b, and the first magnet 3642 and the second magnet 3644 are respectively installed on opposite sides of the disk-shaped portion 3645a, thereby facilitating assembly of the first magnet 3642 and the second magnet 3644 and better fixing the first magnet 3642 and the second magnet 3644 to the rotating shaft 35.

[0053] Specifically, the first magnet 3642 and the second magnet 3644 are both annular Halbach array magnets. The first magnet 3642 includes a plurality of first magnet blocks 3642a whose magnetization direction is parallel to the axis of the first magnet 3642, and the second magnet 3644 includes a plurality of second magnet blocks 3644a whose magnetization direction is parallel to the axis of the second magnet 3644. The plurality of second magnet blocks 3644a and the plurality of first magnet blocks 3642a are respectively arranged on opposite sides of a disk-shaped portion 3645a around the rotation shaft 35. In the extension direction of the rotation shaft 35, each second magnet block 3644a is arranged opposite to one first magnet block 3642a, and the polarities of the sides of the opposing second magnet block 3644a and first magnet block 3642a facing the disk-shaped portion 3645a are opposite. By installing them in this manner, it is possible to easily attach the first magnet 3642 and the second magnet 3644, and to avoid the problem of the magnet blocks of the first magnet 3642 and the magnet blocks of the second magnet 3644 repelling each other, making assembly difficult.

[0054] In some embodiments, the first magnet 3642 further includes a plurality of third magnet blocks 3642b magnetized along the circumferential direction of the first magnet 3642, and the plurality of third magnet blocks 3642b magnetized in the circumferential direction and the plurality of first magnet blocks 3642a magnetized along an axis parallel to the first magnet 3642 are alternately arranged along the circumference on which the first magnet 3642 is located. Here, the magnetization directions of adjacent first magnet blocks 3642a are opposite. For example, the magnetization direction of one of the adjacent first magnets 3642 is from the side away from the disk-shaped portion 3645a of the first magnet block 3642a to the side toward the disk-shaped portion 3645a, and the magnetization direction of the other is from the side toward the disk-shaped portion 3645a of the first magnet block 3642a to the side away from the disk-shaped portion 3645a. The magnetization direction of the adjacent third magnet block 3642b is opposite on the circumference where the first magnet 3642 is located.

[0055] Correspondingly, the second magnet 3644 further includes a plurality of fourth magnet blocks 3644b magnetized along the circumferential direction of the second magnet 3644, and the plurality of fourth magnet blocks 3644b and the plurality of second magnet blocks 3644a are alternately arranged along the circumference on which the second magnet 3644 is located. Here, the magnetization directions of adjacent second magnet blocks 3644a are opposite, and the magnetization directions of adjacent fourth magnet blocks 3644b are opposite on the circumference on which the second magnet 3644 is located.

[0056] In addition, the magnetization direction of the third magnet block 3642b and the fourth magnet block 3644b is not limited to circumferential magnetization, and in some embodiments, the magnetization direction of the third magnet block 3642b and the fourth magnet block 3644b may be inclined with respect to the axis of the rotation shaft 35.

[0057] In the illustrated embodiment, the first magnet 3642 and the second magnet 3644 each include eight magnet blocks, i.e., the first magnet block 3642a, the second magnet block 3644a, the third magnet block 3642b, and the fourth magnet block 3644b each include four. The first magnet block 3642a, the second magnet block 3644a, the third magnet block 3642b, and the fourth magnet block 3644b are all ring-shaped sector magnets, and the first magnet 3642 and the second magnet 3644 have a generally circular ring structure. It will be appreciated that in other embodiments, the first magnet 3642 and the second magnet 3644 may include more or fewer magnet blocks, such as two, four, six, or ten.

[0058] To facilitate the installation of the first magnet 3642 and the second magnet 3644, the flywheel 3645 is further provided with markers 3645c for determining the installation positions of the first magnet block 3642a and the second magnet block 3644a. The markers 3645c may be provided as grooves, scale lines, markers, or the like. When installing the first magnet block 3642a and the second magnet block 3644a, simply marking the positions of one of the first magnet block 3642a and one of the second magnet blocks 3644a using the markers 3645c allows the installation positions of the remaining magnet blocks to be determined, thereby facilitating the installation of the first magnet 3642 and the second magnet 3644. Specifically, the markers 3645c may be provided on at least one of the tubular portion 3645b and the disk-shaped portion 3645a. Specifically, in the illustrated embodiment, the tubular portion 3645b has a marking portion 3645c provided on both end surfaces thereof.

[0059] In this embodiment, the flywheel 3645 further includes an outer peripheral wall 3645d disposed around the disk-shaped portion 3645a, and the outer peripheral wall 3645d, the tubular portion 3645b, and the disk-shaped portion 3645a together surround a first storage portion 3645e and a second storage portion 3645f that store the first magnet 3642 and the second magnet 3644, respectively, and the first storage portion 3645e and the second storage portion 3645f are separated by the disk-shaped portion 3645a. This arrangement not only facilitates the attachment of the first magnet 3642 and the second magnet 3644, but also strengthens the connection between the flywheel 3645 and the first magnet 3642 and the second magnet 3644.

[0060] In this embodiment, in the axial direction of the tubular portion 3645b, the side of the first magnet 3642 away from the disk-shaped portion 3645a is higher by a certain distance than the outer peripheral wall 3645d, and the side of the second magnet 3644 away from the disk-shaped portion 3645a is higher by a certain distance than the outer peripheral wall 3645d, making it easier to assemble the first magnet 3642 and the second magnet 3644 to the flywheel 3645.

[0061] The flywheel 3645 is not limited to the above structure, and in some embodiments, the flywheel 3645 does not have the outer peripheral wall 3645d, and in some embodiments, the flywheel 3645 does not have the outer peripheral wall 3645d and the tubular portion 3645b, and in this case, the rotating shaft 35 is fixedly mounted in the disk-shaped portion 3645a, for example, in the center of the disk-shaped portion 3645a. Compared to a flywheel 3645 having only the disk-shaped portion 3645a, the provision of the tubular portion 3645b allows for a more stable connection between the flywheel 3645 and the rotating shaft 35.

[0062] Referring also to FIG. 14 , in order to supply power to and / or control the power stator 366, it is typically necessary to electrically connect electrical wires 50 to the power stator 366, and the electrical wires 50 connected to the power stator 366 typically extend inside the drive housing 32 to one end of the drive housing 32 away from the impeller 20, and the magnetic assembly 364 is installed between the power stator 366 and the drive stator 362. Therefore, if the electrical wires 50 connected to the power stator 366 come into contact with the rotating magnetic assembly 364, there is a risk that the electrical wires 50 electrically connected to the power stator 366 will become twisted or come loose as the magnetic assembly 364 rotates.

[0063] For this purpose, a guard portion 322 is fixedly provided within the drive housing 32, the position of the guard portion 322 corresponds to the position of the magnetic assembly 364, a guard gap 324 is formed between the guard portion 322 and the inner wall of the drive housing 32, the electric wire 50 passes through the guard gap 324 and is electrically connected to the power stator 366, and the guard portion 322 is positioned between the magnetic assembly 364 and the electric wire 50. By providing the guard portion 322, it is possible to avoid the risk that the electric wire 50 will come into contact with the magnetic assembly 364 during rotation of the magnetic assembly 364, causing the electric wire 50 to be twisted or come off as the magnetic assembly 364 rotates. In some embodiments, one end of the electric wire 50 is electrically connected to the second coil 3665 of the power stator 366, and the other end is electrically connected to an external controller of the blood pump 100.

[0064] It should be noted that the method of installing the guard portion 322 to prevent the electrical wire 50 from rotating together with the magnetic assembly 364 is not limited to this. In some embodiments, a passage for drilling the electrical wire 50 may be provided in the side wall of the direct drive housing 32, in which case the installation of the guard portion 322 is not necessary.

[0065] Note that the drive member 36 is not limited to the above structure. In some embodiments, the magnetic assembly 364 has two flywheels, and the power stator 366 is located between the two flywheels, i.e., one flywheel is located between the impeller 20 and the power stator 366, and the other flywheel is located between the power stator 366 and the drive stator 362. The first magnet 3642 is fixed on the flywheel between the power stator 366 and the drive stator 362, and the second magnet 3644 is fixed on the flywheel between the impeller 20 and the power stator 366. In this case, when the guard portion 322 is installed, the guard portion 322 is installed between the flywheel between the power stator 366 and the drive stator 362 and the drive housing 32. In other words, the position of the guard portion 322 corresponds to the position of the first magnet 3642. In this case, the guard portion 322 is located between the flywheel to which the first magnet 3642 is attached and the electric wire 50. As will be appreciated, the magnetic assembly 364 may then not have a flywheel, with the guard portion 322 positioned between the first magnet 3642 and the electrical wire 50 .

[0066] Alternatively, in some embodiments, two flywheels are positioned between the drive stator 362 and the power stator 366, and the two flywheels are used to mount the first magnet 3642 and the second magnet 3644, respectively, and in this case, when the guard portion 322 is installed, the guard portion 322 is installed between both the flywheel to which the first magnet 3642 is attached and the electrical wire 50, and between the flywheel to which the second magnet 3644 is attached and the electrical wire 50. As will be understood, the magnetic assembly 364 does not have to include a flywheel, and in this case, the guard portion 322 is installed between both the first magnet 3642 and the electrical wire 50 and the second magnet 3644 and the electrical wire 50.

[0067] Alternatively, in some embodiments, the magnetic assembly 364 includes a single flywheel, with one of the first magnet 3642 and the second magnet 3644 mounted on the flywheel and the other mounted directly on the rotating shaft 35 .

[0068] Alternatively, in some embodiments, the drive member 36 has only one of the drive stator 362 and the power stator 366. For example, the drive member 36 has only the drive stator 362 and not the power stator 366. In this case, the magnetic assembly 364 does not have the second magnet 3644, and the magnetic assembly 364 is located between the impeller 20 and the drive stator 362. In this case, there is no need to install the guard portion 322. Also, for example, the drive member 36 has only the power stator 366. In this case, the magnetic assembly 364 does not have the first magnet 3642. In this case, the magnetic assembly 364 may be located between the impeller 20 and the power stator 366, and the power stator 366 may be located between the impeller 20 and the magnetic assembly 364. When the magnetic assembly 364 is installed between the impeller 20 and the power stator 366, the electrical wires 50 electrically connected to the power stator 366 do not pass through the magnetic assembly 364, so there is no need to install the guard portion 322. However, when the power stator 366 is installed between the impeller 20 and the magnetic assembly 364, it is preferable to install the guard portion 322 to prevent the electrical wires 50 from rotating together with the magnetic assembly 364.

[0069] Alternatively, in some embodiments, the rotating shaft 35 may be installed to penetrate the drive stator 362, and in this case, the drive member 36 may or may not have a power stator 366. If the drive member 36 does not have a power stator 366, the installation manner of the drive stator 362 may be the same as the installation manner of the drive member 36 having only the power stator 366. If the drive member 36 simultaneously has the drive stator 362 and the power stator 366 and the rotating shaft 35 penetrates the drive stator 362 and the power stator 366, the magnetic assembly 364 may be installed between the drive stator 362 and the power stator 366, or the power stator 366 may be located between the first magnet 3642 and the second magnet 3644, or the power stator 366 and the drive stator 362 may be located between the first magnet 3642 and the second magnet 3644.

[0070] 3 and 4, the sensing assembly 40 can detect the fluid pressure outside the drive unit 30, and the external fluid pressure can be used to determine whether the drive unit 30 is located at a target position, i.e., whether the blood pump 100 is located at a target position. For example, the sensing assembly 40 can be used to detect whether the blood pump 100 has reached a target position during transportation of the blood pump 100, and can detect the position of the blood pump 100 in real time during operation of the blood pump 100, and can adjust the position of the blood pump 100 in a timely manner if the blood pump 100 deviates from the target position. Here, the sensing assembly 40 includes a sensor 42, which includes a probe 422, which is housed in the housing cavity 34a, and the position of the probe 422 corresponds to the position of the detection port 34b, and the probe 422 can detect the fluid pressure outside the drive unit 30. Specifically, the probe 422 is sealed in the housing cavity 34a.

[0071] Specifically, the sensor 42 is an optical fiber pressure sensor, which has the advantages of being free from electromagnetic interference, small in size, highly reliable in measurement, highly accurate, and corrosion-resistant, and is particularly suitable for blood pumps with an outer diameter of not more than 10 mm, such as intravascular blood pumps.

[0072] Specifically, the sensor 42 further includes a transmission optical fiber 424 connected to the probe 422, and one end of the transmission optical fiber 424 close to the probe 422 is housed in the storage cavity 34a. In the illustrated embodiment, the storage cavity 34a has a communication opening 34c, and the transmission optical fiber 424 is drilled through the communication opening 34c, with one end of the transmission optical fiber 424 housed in the storage cavity 34a and connected to the probe 422, and the other end of the transmission optical fiber 424 extending from the communication opening 34c into the drive housing 32. Specifically, the portion of the transmission optical fiber 424 located outside the storage cavity 34a is drilled through the drive housing 32 and extends outside the drive housing 32 from one end of the drive housing 32 remote from the bushing assembly 24.

[0073] In some embodiments, the sensing assembly 40 further includes an encapsulation tube 43, and the portion of the transmission optical fiber 424 located outside the storage cavity 34a is encapsulated in the encapsulation tube 43. Typically, the transmission optical fiber 424 of a fiber optic pressure sensor is made of glass fiber, which is brittle and easily broken. Therefore, encapsulating the portion of the transmission optical fiber 424 located outside the storage cavity 34a with the encapsulation tube 43 can effectively protect the transmission optical fiber 424. Because the transmission optical fiber 424 located inside the storage cavity 34a is protected by the cavity wall of the storage cavity 34a, the encapsulation tube 43 does not need to be installed in the portion of the transmission optical fiber 424 located inside the storage cavity 34a. In this way, the size of the storage cavity 34a can be reduced. In one embodiment, the encapsulation tube 43 is a PI encapsulation tube.

[0074] Specifically, the sensing assembly 40 further includes a soft filler 44 disposed between the probe 422 and the cavity wall of the receiving cavity 34a, thereby preventing rigid contact between the probe 422 and the cavity wall of the receiving cavity 34a and protecting the probe 422.

[0075] Specifically, a soft filler 44 is also provided in the detection port 34b, and the soft filler 44 of the detection port 34b seals the detection port 34b and transmits the received fluid pressure to the probe 422. That is, the soft filler 44 of the detection port 34b seals the detection port 34b to prevent fluid outside the blood pump 100 from entering the receiving cavity 34a through the detection port 34b, and also transmits the pressure to the probe 422. The soft filler 44 is in close contact with the probe 422 so that the external fluid pressure can be efficiently transmitted to the probe 422 via the soft filler 44 located in the detection port 34b.

[0076] In some embodiments, the soft filler material 44 may be, for example, silica gel.

[0077] In the illustrated embodiment, the blood pump 100 further includes a catheter assembly 60 fixedly connected to the drive housing 32. The catheter assembly 60 allows infusion fluid to pass through the drive housing 32, and a gap through which the infusion fluid passes is provided between the rotating shaft 35 and the bushing assembly 34. The infusion fluid passed through the catheter assembly 60 into the drive housing 32 flows out of the drive housing 32 through the gap between the rotating shaft 35 and the bushing assembly 34 and into the cannula assembly 10. Specifically, the infusion fluid passed through the catheter assembly 60 into the drive housing 32 flows sequentially through the gap between the second bushing 346 and the rotating shaft 35, the gap between the convex ring 354 of the rotating shaft 35 and the protrusion 3422 of the connecting sleeve 342, and the gap between the rotating shaft 35 and the first bushing 344, and then flows into the cannula assembly 10 through the gap between the rotating shaft 35 and the first bushing 344.

[0078] Here, the infusion fluid serves to prevent blood in the cannula assembly 10 from entering the drive housing 35 through the gap between the rotating shaft 35 and the first bushing 344, and also serves to lubricate the gap between the second bushing 346 and the rotating shaft 35, and between the rotating shaft 35 and the first bushing 344.

[0079] Specifically, a supply tube communicating with the drive housing 32 is provided within the catheter assembly 60 , and the supply tube is used to pass an infusion liquid through the drive housing 32 .

[0080] In some embodiments, the infusion fluid may be, for example, saline, heparinized saline, or dextrose.

[0081] Specifically, the gap between the wall of first axial hole 344a and rotating shaft 35 is 2 μm or less. 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 backwashing cleaning fluid passes through this gap, so blood can be more effectively prevented from entering the inside of drive housing 32 through first axial hole 344a.

[0082] To prevent the injection liquid from contaminating and / or corroding the elements in the drive unit 30, the drive members 36 (e.g., the drive stator 362 and the power stator 366) of the drive unit 30 are covered with a waterproof sealing membrane. Here, the material of the waterproof sealing membrane may be silica gel, a membrane made of glue, etc.

[0083] Specifically, catheter assembly 60 further includes electrical connection wires electrically connected to drive unit 30 (e.g., electrical connection wires electrically connecting drive unit 30 to an external controller). Specifically, both the supply tube and the electrical connection wires extend into drive housing 32 from one end remote from the open end of drive housing 32. Electrical wires 50 may be directly or indirectly electrically connected to the electrical connection wires.

[0084] To prevent the infusion fluid from entering the storage cavity 34a from the drive housing 35 and affecting the detection accuracy of the probe 422 in the storage cavity 34a, a sealant 326 is provided at the communication port 34c, which prevents communication between the storage cavity 34a and the drive housing 32 through the communication port 34c, and prevents the infusion fluid in the drive housing 32 from entering the storage cavity 34a through the communication port 34c and affecting the detection accuracy of the external fluid pressure by the probe 422. Specifically, the portion of the transmission optical fiber 424 located outside the storage cavity 34a and the drive housing 35 is housed in the catheter assembly 60, and extends outside the patient together with the catheter assembly 60 to be connected to an external controller.

[0085] 6 and 8, a first fluid groove 344b is further provided on the side of the first bushing 344 closer to the protruding ring 354, and the first fluid groove 344b communicates with the gap between the first bushing 344 and the rotating shaft 35. Specifically, the first fluid groove 344b is located at one end of the boss 3444 away from the cap portion 3442. A second fluid groove 346c is provided on the side of the second bushing 346 closer to the protruding ring 354, and the second fluid groove 346c communicates with the gap between the second bushing 346 and the rotating shaft 35. In this way, the flow of the injection liquid is facilitated. Note that in other embodiments, a fluid groove may be provided in either the first bushing 344 or the second bushing 346, or neither may be provided.

[0086] The blood pump 100 has at least the following advantages. (1) The bushing assembly 34 of the drive unit 30 is provided with a storage cavity 34a and a detection port 34b communicating with the storage cavity 34a. The probe 422 of the sensor 42 of the sensing assembly 40 is accommodated in the storage cavity 34a. The position of the probe 422 corresponds to the position of the detection port 34b, which is located on the outer wall of the bushing assembly 34. This allows the probe 422 to detect the fluid pressure outside the drive unit 30 at the detection port 34b. This allows the operator to relatively accurately determine whether the drive unit 30 is located at the target position based on the detected external fluid pressure value, facilitating transportation of the blood pump 100 and adjustment of the position of the blood pump 100. By providing the storage cavity 34a on the bushing assembly 34 to accommodate the sensor probe 422 and integrating the probe 422 into the bushing assembly 34, the problem of the diameter of the drive unit 30 increasing when the sensing assembly 40 is added to the drive unit 30 can be avoided. Therefore, the blood pump 100 not only can detect the position of the blood pump 100 more accurately, but also has a smaller diameter. (2) By sealing the probe 422 of the sensor 42 of the sensing assembly 40 within the storage cavity 34a of the bushing assembly 34, it is possible to effectively prevent the injection liquid in the drive housing 32 from entering the storage cavity 34a and affecting the accuracy of the detection of external fluid pressure by the probe 422, and it is also possible to prevent external fluid (e.g., blood) from the blood pump 100 from entering the storage cavity 34a through the detection port 34b and contaminating the sensor 42, or from entering the drive housing 32 through the storage cavity 34a and contaminating the elements inside the drive housing 32. (3) The position of the probe 422 corresponds to the position of the detection port 34b, and the closer the position of the detection port 34b is to the outlet 14 or the closer the position of the detection port 34b is to the outlet 14 of the cannula assembly 10, the more directly the data detected by the probe 422 can be used to determine the position of the blood pump 100, and the more accurate the detected data is. (4) The portion of the transmission optical fiber 424 of the blood pump 100 located outside the receiving cavity 34a is drilled into the drive housing 32 and extends from one end of the drive housing 32 away from the cannula assembly 10 to the outside of the drive housing 32. As a result, the portion of the sensing assembly 40 attached to the blood pump 100 is integrated inside the drive unit 30, thus providing a protective role for the transmission assembly 40. (5) By installing the driving stator 362 and the rotating shaft 35 at an interval along the axis of the rotating shaft 35, i.e., by not drilling the rotating shaft 35 into the driving stator 362, it is easy to install the core of the driving stator 362 with a large cross-sectional area, which is advantageous for reducing the power consumption of the entire blood pump 100 and reducing the amount of heat generated.

[0087] As shown in Figures 15 to 20, the second embodiment of the blood pump 700 has almost the same structure as the first embodiment of the blood pump 100, with the difference being that the storage cavity 710a and detection port 710b of the bushing assembly 710 of the second embodiment of the blood pump 700 are both located on the connecting sleeve 712, and the detection port 710b is located on the outer peripheral wall of one end of the connecting sleeve 712 close to the cap portion 714a of the first bushing 714, the position of the detection port 710b also corresponds to the position of the outlet 722 of the cannula assembly 720, and the surface on which the boss 714b of the cap portion 714a of the first bushing 714 is formed abuts against the end face of one end of the connecting sleeve 712 away from the drive housing.

[0088] If the direction of extension of the axis of the rotating shaft 730 is defined as the axial direction of the blood pump 700 and the direction perpendicular to the axis of the rotating shaft 730 is defined as the radial direction, the detection port 710b of this embodiment is installed radially, thereby reducing the influence of pressure exerted by the blood flow caused by the rotation of the impeller 740 on the probe 752 of the sensing assembly 750. In other words, the installation manner of the detection port 710b of this embodiment can not only more accurately detect the external fluid pressure during transport of the blood pump 700, but also more accurately detect the external fluid pressure during operation of the blood pump 700.

[0089] The structure of the blood pump 700 of the second embodiment is similar to the structure of the blood pump 100 of the first embodiment, and therefore has the advantages of the blood pump of the first embodiment, so a description thereof will be omitted here.

[0090] 21 to 23, the blood pump 800 of the third embodiment has almost the same structure as the blood pump 100 of the first embodiment, except that the structure of a bushing assembly 810 of the blood pump 800 of the third embodiment is slightly different from the structure of the bushing assembly 34 of the blood pump 100 of the first embodiment. More specifically, the structures of a connecting sleeve 812 and a first bushing 814 of the bushing assembly 810 of this embodiment are different from the structures of a connecting sleeve 342 and a first bushing 344 of the bushing assembly 34 of the blood pump 100 of the first embodiment.

[0091] 24 to 26, in this embodiment, the first bushing 814 does not have a cap portion, and the first bushing 814 has a generally disc-shaped structure. The first bushing 814 is fixedly housed in the connecting sleeve 812. The first bushing 814 is installed at one end of the connecting sleeve 812 remote from the drive housing 820, and the outer wall of the first bushing 814 is fixedly connected to the inner wall of the connecting sleeve 812.

[0092] Specifically, the first bushing 814 and the connecting sleeve 812 are adhesively fixed together by an adhesive. In the illustrated embodiment, an adhesive groove 814a for accommodating adhesive is provided on the outer peripheral wall of the first bushing 814 to facilitate the fixed attachment of the first bushing 814 within the connecting sleeve 812.

[0093] Here, both the storage cavity 810a and the detection port 810b are located on the connecting sleeve 812. In the illustrated embodiment, the detection port 810b is located on the outer circumferential wall of the connecting sleeve 812. The detection port 810b in this embodiment is installed radially. Therefore, the probe of this embodiment can accurately detect the position of the blood pump 800 even when the blood pump 800 is operating.

[0094] As will be appreciated, in other embodiments, detection port 810b may be located on the end face of connection sleeve 812 at the end remote from drive housing 820. This places detection port 810b closer to outlet 832 of cannula assembly 830, which facilitates more accurate and direct detection of the position of blood pump 800 when it is being transported.

[0095] The structure of the blood pump 800 of the third embodiment is similar to that of the blood pump 100 of the first embodiment, and therefore has the advantages of the blood pump 100 of the first embodiment, so a description thereof will be omitted here.

[0096] 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, it should be understood that 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 these modifications or replacements do not deviate from 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. A drive device configured to drive rotation of an impeller of a blood pump and capable of being fixedly connected to a cannula assembly of said blood pump, comprising: the impeller is rotatably housed within the cannula assembly; the drive device includes a drive housing, a bushing assembly, a rotating shaft, a drive member, and a sensing assembly; the bushing assembly is fixedly connected to one end of the drive housing, the bushing assembly is provided with a storage cavity and a detection port communicating with the storage cavity, the detection port being located on an outer wall of the bushing assembly; the rotating shaft is rotatably mounted in the bushing assembly, one end of the rotating shaft extends into the drive housing, and the other end extends away from the drive housing and is fixedly connected to the impeller; the drive member is attached to the drive housing and is capable of driving the rotation of the rotary shaft; the sensing assembly includes a sensor, the sensor includes a probe, the probe is housed in the housing cavity, a position of the probe corresponds to a position of the detection port, and the probe is capable of detecting a fluid pressure outside the drive device; the bushing assembly includes a connecting sleeve fixedly connected to the drive housing and a first bushing fixedly connected to the connecting sleeve, the rotation shaft being rotatably drilled through the first bushing and the connecting sleeve, and when the drive device is fixedly connected to the cannula assembly, a position of the detection port corresponds to a position of an outlet of the cannula assembly or the position of the detection port is close to the outlet of the cannula assembly; A drive device characterized in that at least a portion of the storage cavity is located on the first bushing, and at least a portion of the detection port is located on the first bushing, or the storage cavity and the detection port are both located on the connecting sleeve.

2. the first bushing includes a disk-shaped cap portion having opposing first and second surfaces, and a boss formed on the first surface, the first bushing having a first axial hole extending from an end face of the boss away from the cap portion to the second surface of the cap portion, the cap portion sealingly covering an opening at one end of the connection sleeve, the drive housing fitted into the end of the connection sleeve away from the cap portion, and the rotary shaft rotatably drilled through the first axial hole and the connection sleeve, 2. The driving device of claim 1, wherein the storage cavity extends onto the cap portion from an end face of the connecting sleeve at one end away from the cap portion, and at least a portion of the detection port is located on the cap portion, or the storage cavity and the detection port are both located on the connecting sleeve, and the detection port is located at one end of the connecting sleeve closer to the cap portion.

3. 2. The drive device of claim 1, wherein the first bushing is fixedly accommodated in the connecting sleeve, the accommodation cavity and the detection port are both located on the connecting sleeve, and the detection port is installed at one end of the connecting sleeve away from the drive housing.

4. 2. The drive device of claim 1, wherein the bushing assembly further includes a second bushing fixedly connected to the connecting sleeve, the second bushing and the first bushing are installed along an axis of the rotating shaft, and the rotating shaft is rotatably inserted into the second bushing.

5. 5. The drive device of claim 4, wherein the first bushing has a first shaft hole, the second bushing has a second shaft hole, the rotating shaft includes a shaft body and a convex ring arranged around the shaft body by one circumference, the shaft body is rotatably inserted into the first shaft hole, the second shaft hole and the connecting sleeve, one end of the shaft body extends into the drive housing, the convex ring is located between the first bushing and the second bushing, and an outer diameter of the convex ring is larger than a diameter of the first shaft hole and larger than a diameter of the second shaft hole.

6. the sensing assembly further comprises a soft filler; 2. The driving device according to claim 1, wherein the soft filler is installed between the probe and the cavity wall of the storage cavity and / or the soft filler is installed in the detection port, the soft filler seals the detection port, and the soft filler can transmit the received fluid pressure to the probe.

7. 2. The driving device according to claim 1, wherein the sensor is an optical fiber pressure sensor, the sensor further includes a transmission optical fiber connected to the probe, and one end of the transmission optical fiber close to the probe is housed in the housing cavity.

8. 8. The drive device according to claim 7, wherein the storage cavity further has a communication opening, the transmission optical fiber is drilled through the communication opening, one end of the transmission optical fiber is housed in the storage cavity and connected to the probe, and the other end of the transmission optical fiber extends from the communication opening into the drive housing, and the communication opening is provided with a seal material that prevents communication between the storage cavity and the drive housing through the communication opening.

9. 8. The driving device according to claim 7, wherein the sensing assembly further includes an encapsulation tube, and a portion of the transmission optical fiber located outside the storage cavity is encapsulated in the encapsulation tube.

10. 2. The drive device of claim 1, wherein the drive member includes a drive stator fixedly connected to the drive housing and spaced apart from the rotatable shaft along an axis of the rotatable shaft, and a magnetic assembly including a first magnet fixedly connected to the rotatable shaft, the drive stator capable of generating a rotating magnetic field that drives rotation of the first magnet to move and rotate the rotatable shaft.

11. 11. The drive device according to claim 10, wherein the drive stator includes a plurality of first cores arranged at intervals of one revolution around the axis of the rotating shaft, and a plurality of first coils wound around each of the plurality of first cores.

12. 11. The drive device of claim 10, wherein the drive member further includes a power stator fixedly connected to the drive housing, the power stator and the drive stator being installed along an axis of the rotating shaft, the rotating shaft being rotatably inserted into the power stator, the magnetic assembly further including a second magnet fixedly connected to the rotating shaft, and the power stator capable of generating a rotating magnetic field that drives rotation of the second magnet.

13. 13. The drive device of claim 12, wherein the magnetic assembly 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 both being installed on the flywheel.

14. the flywheel includes a disk-shaped portion, the rotating shaft is fixedly mounted in 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, and the second magnet includes a plurality of second magnet blocks whose magnetization direction is parallel to an axis of the second magnet, 14. The drive device of claim 13, wherein the plurality of second magnet blocks and the plurality of first magnet blocks are respectively arranged on the disk-shaped portion around the rotation axis, each of the second magnet blocks is arranged opposite one of the first magnet blocks in the extension direction of the rotation axis, and the polarities of the sides of the opposing first magnet block and second magnet block facing the disk-shaped portion are opposite.

15. 13. The drive device of claim 12, wherein the drive stator includes a first core and a first coil, the first core is plural, and the first cores are arranged at intervals of one revolution around the axis of the rotating shaft; the power stator includes a second core and a second coil, the second core is plural, and the second cores are arranged at intervals of one revolution around the rotating shaft; both the first core and the second core include a magnetic pillar, the first coil is wound around the magnetic pillar of the first core, and the second coil is wound around the magnetic pillar of the second core; and the cross-sectional area of ​​the magnetic pillar of the first core is larger than the cross-sectional area of ​​the magnetic pillar of the second core.

16. 13. The drive unit according to claim 12, wherein the first magnet is located between the drive stator and the power stator, a guard portion is fixedly provided within the drive housing, a position of at least a portion of the guard portion corresponds to a position of the first magnet, a guard gap is formed between the guard portion and an inner wall of the drive housing, the drive unit further includes an electric wire, the electric wire is drilled through the guard gap and electrically connected to the power stator, and the guard portion is located between the first magnet and the electric wire.

17. A blood pump comprising: a rotatable impeller; a drive unit according to any one of claims 1 to 16; and the cannula assembly fixedly connected to the drive unit.

18. 18. The blood pump of claim 17, further comprising a catheter assembly fixedly connected to the drive housing, the catheter assembly allowing an infusion fluid to pass through the drive housing, a gap between the rotating shaft and the bushing assembly through which the infusion fluid passes, and the probe sealed within the storage cavity.

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