Drive device and blood pump

Abstract

This invention relates to the field of medical device technology, providing a driving device and a blood pump. The driving device includes a housing, a rotating shaft, a first bushing, a second bushing, and a limiting component. The rotating shaft includes a shaft portion and a sliding portion located at one end of the shaft portion. The sliding portion has a spherical crown surface. The first bushing has a groove, the depth of which is less than or equal to the height of the spherical crown surface along the axial direction of the shaft portion. The sliding portion is movably disposed in the groove, and the spherical crown surface slides against the groove wall. The shaft portion is rotatably inserted through the second bushing. The limiting component is fixed to the shaft portion and located between the first and second bushings, and the limiting component abuts against the second bushing. The above-described driving device and blood pump operate relatively smoothly.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a drive device and a blood pump. Background Technology

[0002] The blood pump is designed to be inserted percutaneously into a patient's blood vessel, such as an artery or vein in the thigh or armpit, and can be inserted into the patient's heart to function as a left ventricular assist device or a right ventricular assist device.

[0003] Blood pumps typically consist of a drive unit and an impeller. The impeller is connected to the shaft of the drive unit, which is supported by bearings on the housing of the drive unit. The shaft can rotate relative to the bearings and / or the housing, thereby driving the impeller to rotate and realize the blood pumping function. However, traditional blood pumps have safety risks due to abnormal shutdowns during operation. Summary of the Invention

[0004] Therefore, the purpose of this invention is to provide a safer and more reliable drive device and blood pump.

[0005] In a first aspect, this application provides a driving device, comprising:

[0006] case;

[0007] A rotating shaft rotatably disposed on the housing, the rotating shaft including a shaft portion and a sliding portion disposed at one end of the shaft portion, the end of the shaft portion away from the sliding portion being used for connection with an impeller, the sliding portion having a spherical crown surface;

[0008] A first bushing is installed on the housing. The first bushing has a groove. The depth of the groove is less than or equal to the height of the spherical crown surface in the axial direction of the shaft. The sliding part is movably disposed in the groove, and the spherical crown surface slides against the groove wall.

[0009] A second bushing is mounted on the housing, wherein the shaft portion is rotatably inserted through the second bushing;

[0010] A limiting component is fixed to the shaft portion and located between the first bushing and the second bushing, and the limiting component is capable of abutting against the second bushing.

[0011] Secondly, this application provides a blood pump, including an impeller and a drive device as described in any of the above claims, wherein the impeller is connected to the end of the shaft that is away from the sliding portion, and the impeller is rotatable with the shaft.

[0012] The beneficial effects of the drive device and blood pump provided by the present invention are as follows: the sliding part of the rotating shaft is movably disposed in the groove of the first bushing, and the spherical crown surface of the sliding part slides against the groove wall, so that the first bushing restricts the movement of the rotating shaft along the axis of the rotating shaft towards the first bushing. The limiting component fixed to the shaft part can abut against the second bushing, so that the second bushing restricts the movement of the rotating shaft along the axis of the rotating shaft away from the first bushing. Furthermore, the shaft part of the rotating shaft can rotatably pass through the second bushing, and the sliding part of the rotating shaft is movably disposed in the groove of the first bushing, thereby achieving a limiting effect on the rotating shaft in the radial direction. The height of the spherical crown surface of the sliding part in the axial direction of the shaft part is greater than or equal to the depth of the groove, which can effectively prevent the rotating shaft from being jammed by the groove wall and thus prevent the risk of pump stoppage, thereby improving the safety and reliability of the blood pump. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the blood pump provided in an embodiment of the present invention;

[0015] Figure 2 for Figure 1 An exploded view of the blood pump in the image;

[0016] Figure 3 for Figure 1 A schematic diagram of the cannula assembly of the blood pump in the image;

[0017] Figure 4 for Figure 3 Enlarged view of section A in the image;

[0018] Figure 5 for Figure 3 A schematic diagram of the connecting pipe of the bushing assembly in the middle;

[0019] Figure 6 for Figure 5 A schematic diagram of the internal structure of the connecting pipe in the middle;

[0020] Figure 7 for Figure 5 A schematic diagram of the internal structure of the connecting pipe in the middle;

[0021] Figure 8 for Figure 1 An exploded view of the blood pump without the cannula and connecting tube;

[0022] Figure 9for Figure 1 Another exploded view of the blood pump, omitting the cannula and connecting tube;

[0023] Figure 10 for Figure 1 The blood pump in the image is a cross-sectional view omitting the cannula, connecting cannula, and part of the catheter.

[0024] Figure 11 for Figure 10 A magnified view of section B;

[0025] Figure 12 for Figure 10 A schematic diagram of the structure in which the rotating shaft, the first bushing, and the second bushing are assembled together;

[0026] Figure 13 for Figure 12 A schematic diagram of the assembly of the first bushing and part of the rotating shaft;

[0027] Figure 14 for Figure 12 A schematic diagram showing the positional relationship between the rotating shaft and the second bushing when the shaft wobbles.

[0028] Figure 15 for Figure 10 A sectional view of the first bushing in the middle;

[0029] Figure 16 for Figure 10 A schematic diagram of the support base in the middle;

[0030] Figure 17 for Figure 10 A schematic diagram of the structure of the second bushing in the middle;

[0031] Figure 18 for Figure 10 A schematic diagram of the structure of the first rotor in the process;

[0032] Figure 19 for Figure 18 A schematic diagram of the structure of the first flywheel of the first rotor in the process;

[0033] Figure 20 for Figure 10 A schematic diagram of the structure of the second rotor in the diagram;

[0034] Figure 21 for Figure 10 Exploded view of the stator and magnetic conductors.

[0035] The following are the labeling elements in the figure:

[0036] 1. Blood pump;

[0037] 10. Drive unit; 20. Impeller; 21. Blade; 22. Hub; 30. Sleeve assembly; 31. Blood inlet; 32. Blood outlet; 33. Cannula; 34. Connecting tube; 341. Limiting protrusion; 3411. First end face; 3412. Second end face; 3413. Transition surface; 3413a. Cylindrical surface; 3413b. Inclined surface; 342. First tube section; 3421. Tube section gap; 3422. Hollowed-out groove; 343. Second tube section; 35. Outlet tube; 351. Connecting part; 352. Outlet part; 40. Conduit;

[0038] 100. Housing; 101. Inner cavity; 102. Mounting hole; 103. Limiting protrusion; 110. First housing; 120. Second housing;

[0039] 200, pivot; 210, shaft portion; 220, sliding portion; 221, spherical cap surface; 222, cylindrical surface; 223, limiting surface;

[0040] 300, First bushing; 310, Groove; 311, First chamfer; 312, Spherical wall; 320, Fluid flushing hole; 321, First opening;

[0041] 400, Second bushing; 410, Shaft hole; 420, Guide groove; 401, First annular body; 402, Second annular body;

[0042] 500. Limiting components; 510. Thrust ring;

[0043] 610. First rotor; 611. First flywheel; 6111. First disc-shaped portion; 6112. First internal tube; 6113. First external tube; 6114. First annular cavity; 612. First magnet; 620. Second rotor; 621. Second flywheel; 622. Second magnet;

[0044] 700, Stator; 701, First stator unit; 702, Second stator unit; 710, Magnetic core; 720, Coil;

[0045] 810. Support base; 811. Mounting cavity; 812. Cavity bottom; 813. Support step; 814. Liquid inlet hole; 815. Second opening; 816. Diversion channel; 820. Magnetic guide; 821. Magnetic guide plate. Detailed Implementation

[0046] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0047] Throughout this specification, references to "an embodiment" or "an embodiment" mean that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of this application. Therefore, the phrases "in one embodiment" or "in some embodiments" appear in various places throughout the specification, and not all refer to the same embodiment. Furthermore, in one or more embodiments, particular features, structures, or characteristics may be combined in any suitable manner.

[0048] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0049] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0050] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0051] In the field of interventional medicine, the end of the device closer to the operator is usually defined as the proximal end, and the end farther from the operator is defined as the distal end.

[0052] The blood pump 1 and the drive device 10 in the embodiments of the present invention will now be described.

[0053] Please see Figure 1 and Figure 2 The blood pump 1 includes a drive unit 10 and an impeller 20. The drive unit 10 is connected to the impeller 20 in a transmission manner, and the drive unit 10 can drive the impeller 20 to rotate.

[0054] Specifically, the blood pump 1 further includes a cannula assembly 30 fixed to the distal end of the drive device 10. An impeller 20 is rotatably housed within the cannula assembly 30. The cannula assembly 30 has a blood inlet 31 and a blood outlet 32. The blood inlet 31 is located at the distal end of the cannula assembly 30, and the blood outlet 32 ​​is located at the proximal end of the cannula assembly 30. There are multiple blood outlets 32, spaced apart circumferentially along the cannula assembly 30. When the impeller 20 rotates, blood flows into the cannula assembly 30 from the blood inlet 31 and flows out from the blood outlet 32. In one embodiment, the cannula assembly 30 extends through a heart valve, such as an aortic valve, with the blood inlet 31 located inside the heart and the blood outlet 32 ​​and drive device 10 located outside the heart in a blood vessel such as the aorta.

[0055] Please combine them together Figure 3 The cannula assembly 30 includes an insertion cannula 33, a connecting tube 34, and an outlet tube 35, all of which are hollow tubular structures. The insertion cannula 33 is sleeved with the connecting tube 34 such that the inner wall of one end of the connecting tube 34 is connected to the outer wall of the insertion cannula 33. Specifically, the insertion cannula 33 has a proximal end and a distal end, with the proximal end of the insertion cannula 33 engaging with the connecting tube 34, wherein the blood inlet 31 is located on the distal end of the insertion cannula 33.

[0056] Please combine them together Figure 4 The outlet pipe 35 includes a connecting portion 351 near the connecting pipe 34 and an outlet portion 352 away from the connecting pipe 34. The outlet pipe 35 is sleeved with the connecting pipe 34 such that the outer wall of the connecting portion 351 is connected to the inner wall of the end of the connecting pipe 34 away from the insertion tube 33. The end of the outlet portion 352 away from the connecting pipe 34 is fixedly connected to the drive device 10. The impeller 20 is rotatably placed in the outlet pipe 35, or the impeller 20 is partially placed in the outlet pipe 35 and partially placed in the insertion tube 33. A blood outlet 32 ​​is located on the outlet portion 352. Multiple blood outlets 32 are evenly arranged circumferentially on the outlet portion 352. The impeller 20 is driven to rotate by the drive device 10 to draw blood in from the blood inlet 31, through the insertion tube 33, and then out from the multiple blood outlets 32 of the outlet pipe 35.

[0057] The traditional connection between the insertion tube 33 and the outlet tube 35 involves the insertion tube 33 being directly fitted onto the outlet tube 35. However, since the insertion tube 33 is a flexible tube and the outlet tube 35 is a metal tube, there is no matching assembly position, and the diameters of the two tubes are also different. Therefore, before connection, the insertion tube 33 needs to be enlarged in diameter at its port through a molding process to match the outlet tube 35, so that the insertion tube 33 can be fitted onto the outer wall of the outlet tube 35. This process is cumbersome, the connection is unstable, and the strength of the molded part decreases.

[0058] In this embodiment, the insertion tube 33 and the outlet tube 35 in the sleeve assembly 30 are connected by a connecting tube 34. The inner wall of one end of the connecting tube 34 is connected to the outer wall of the insertion tube 33, and the outer wall of the connecting part 351 of the outlet tube 35 is connected to the inner wall of the other end of the connecting tube 34. This allows the insertion tube 33 and the outlet tube 35 to be fixedly connected to form a continuous pipe. This eliminates the need for the insertion tube 33 to undergo a molding process when directly connecting the insertion tube 33 and the outlet tube 35. The connection is stable and the assembly operation is simple.

[0059] like Figures 3 to 6 As shown, the inner wall of the connecting tube 34 is provided with a limiting protrusion 341. Specifically, the limiting protrusion 341 is circularly protruding from the inner wall of the connecting tube 34, and the limiting protrusion 341 is coaxial with the connecting tube 34. The limiting protrusion 341 has a first end face 3411 and a second end face 3412 arranged axially along the connecting tube 34. The first end face 3411 abuts against the end of the insertion tube 33, and the second end face 3412 abuts against the end of the connecting portion 351. The outer diameter of the connecting portion 351 is smaller than the outer diameter of the outlet portion 352. The end of the connecting tube 34 furthest from the insertion tube 33 abuts against the end of the outlet portion 352 near the connecting portion 351, and the outer wall of the connecting tube 34 is flush with the outer wall of the outlet portion 352. Specifically, the inner diameters of the connecting portion 351 and the outlet portion 352 are the same, and the limiting protrusion 341 has a certain thickness to form a first end face 3411 near the insertion tube 33 and a second end face 3412 near the outlet tube 35. When the insertion tube 33 and the outlet tube 35 are respectively fitted into the connecting tube 34, the limiting protrusion 341 can simultaneously limit the axial direction of the outlet tube 35 and the insertion tube 33, controlling the depth of the fitting between the outlet tube 35 and the insertion tube 33, thus playing a pre-positioning role and facilitating subsequent fixing operations. At the same time, the end of the connecting tube 34 can abut against the end of the outlet portion 352, working together with the limiting protrusion 341 to form limiting in both axial directions, resulting in greater stability and a better fit. At this time, the outer wall of the connecting tube 34 is flush with the outer wall of the outlet 352, so that the outer wall of the connecting tube 34 and the outer wall of the outlet 352 of the outlet tube 35 are on the same cylindrical surface. This effectively controls the overall outer diameter of the connection between the connecting tube 34 and the outlet tube 35, making the connection smooth and avoiding uneven drop sections that could cause obstruction of entry into the human blood vessels or even scratch the blood vessels.

[0060] In addition, combined Figures 2-4 and Figure 8As shown, the impeller 20 includes blades 21. The end of the blade 21 furthest from the drive device 10 does not extend beyond the end of the connecting portion 351 furthest from the drive device 10. Specifically, the impeller 20 also includes a hub 22, and the blades 21 are spirally wound around the hub 22. The impeller 20 is partially placed in the outlet pipe 35, and the drive device 10 drives the impeller 20 to rotate. Since the rotation of the impeller 20 will cause vibration and yaw, a certain distance needs to be set between it and the inner wall of the outlet pipe 35 to ensure that the blades 21 will not hit the inner wall of the outlet pipe 35 when the impeller 20 has maximum yaw. The inner wall of the pipe where the limiting ring 341 is located is relatively narrow, while the blades 21 have a certain height in the axial direction of the outlet pipe 35 and occupy a certain width in the radial direction of the outlet pipe 35. The highest point of the blades 21 in the axial direction does not extend beyond the outlet pipe 35. In this way, the blades 21 will not contact the limiting ring 341.

[0061] Furthermore, the limiting protrusion 341 is not limited to the complete circular structure in the above embodiments, but can also be multiple protrusions that are not connected to each other and are evenly spaced, which can save materials while ensuring the limiting function. The limiting protrusion 341 can be a structure that is connected separately to the connecting pipe 34, or it can be a structure that is integrally formed with the connecting pipe 34. Integral forming results in higher strength.

[0062] like Figure 4 As shown, the inner diameter of the insertion tube 33 is smaller than the inner diameter of the outlet tube 35, and the width of the first end face 3411 in the radial direction is greater than the width of the second end face 3412 in the radial direction, so that the inner wall of the insertion tube 33 is flush with the edge of the first end face 3411 and the inner wall of the outlet tube 35 is flush with the edge of the second end face 3412. The limiting protrusion ring 341 also includes a transition surface 3413, which connects the edge of the first end face 3411 and the edge of the second end face 3412.

[0063] Specifically, the intubation tube 33 and the outlet tube 35 have different dimensions and specifications. Due to their different inner diameters, that is, the first end face 3411 protrudes more radially from the inner wall of the connecting tube 34 than the second end face 3412, when they abut against the limiting protrusion ring 341 respectively, the edge of the first end face 3411 needs to be flush with the inner wall of the intubation tube 33, and the edge of the second end face 3412 needs to be flush with the inner wall of the outlet tube 35. In this way, after the outlet tube 35 and the intubation tube 33 abut against the limiting protrusion ring 341, the blood flow channel formed by the inner walls of the three is more continuous, and the three will not form dead corners at the connection transition, avoiding blood from entering dead corners and causing blood to be blocked and forming thrombi.

[0064] More specifically, because the widths of the first end face 3411 and the second end face 3412 are different, a large vertical drop will be formed between the first end face 3411 and the second end face 3412. Since the direction of blood flow is from the insertion tube 33 to the outlet tube 35, a dead angle will also be formed between the two. Therefore, the transition surface 3413 connects the edges of the first end face 3411 and the edges of the second end face 3412, forming a gentler transition surface 3413. This allows blood to flow directly along the transition surface 3413 without forming a dead angle and causing the risk of blood stasis and thrombosis.

[0065] Among them, the transition surface 3413 can also be a convex arc surface or a concave arc surface, and the arc surface has a better effect on blood flow.

[0066] like Figure 4 As shown, the transition surface 3413 has a cylindrical surface 3413a coaxial with the connecting tube 34 and an inclined surface 3413b at an angle to the axis of the connecting tube 34. One end of the cylindrical surface 3413a is connected to one end of the inclined surface 3413b, and the end of the cylindrical surface 3413a away from the inclined surface 3413b is connected to the edge of the first end face 3411. The cylindrical surface 3413a is flush with the inner wall of the insertion tube 33, and the end of the inclined surface 3413b away from the cylindrical surface 3413a is connected to the edge of the second end face 3412.

[0067] The transition surface 3413 consists of two parts: one end of the cylindrical surface 3413a is connected to the edge of the first end face 3411, and the cannula 33 is flush with the inner wall of the cannula 33 after it abuts against the first end face 3411. "Flush" means that the connection surface between the cylindrical surface 3413a and the cannula 33 transitions smoothly without any unevenness. Because the cylindrical surface 3413a is used as a transition point during the forming of the limiting protrusion ring 341, the inclined surface 3413b is not directly connected to the edge of the first end face 3411, thus avoiding the formation of a sharp corner structure at the connection point, reducing processing difficulty. Furthermore, the inclined surface 3413b connects the edges of the cylindrical surface 3413a and the second end face 3412. At this point, blood flow passes through the cylindrical surface 3413a and is guided along the inclined surface 3413b to the outlet tube 35. Therefore, the cannulas 33 and outlet tube 35 with different inner diameters are connected by the limiting protrusion 341, so that the blood flow channel forms a continuous channel. The blood flow flows from the inner wall of the cannulas 33 through the transition surface 3413 of the limiting protrusion 341, and then into the inner wall of the outlet tube 35. The whole process is unobstructed, avoiding blood jamming and thrombus formation.

[0068] Furthermore, the outlet pipe 35 is a metal pipe. The insertion pipe 33 is a flexible pipe and has elasticity. In this embodiment, the outlet pipe 35 is specifically a plastic pipe, and the connecting pipe 34 is also a metal pipe. Since both ends of the connecting pipe 34 need to be joined with two different materials, during the joining process, the inner wall of one end of the connecting pipe 34 is bonded and fixed to the outer wall of the insertion pipe 33, and the end of the connecting pipe 34 away from the insertion pipe 33 is welded and fixed to the outer wall of the connecting part 351, which meets the process requirements. Moreover, the strength is also guaranteed by the metal connecting pipe 34 being sleeved at the joint of the insertion pipe 33 and the outlet pipe 35.

[0069] like Figure 4 As shown, the connecting tube 34 includes a first tube section 342 and a second tube section 343 that are connected to each other. The inner wall of the first tube section 342 is connected to the outer wall of the insertion tube 33, and the inner wall of the second tube section 343 is connected to the outer wall of the connecting portion 351. A limiting protrusion 341 is provided on the inner wall of the second tube section 343. The outer diameters of the first tube section 342 and the second tube section 343 are the same, and the inner diameter of the first tube section 342 is larger than the inner diameter of the second tube section 343. The wall thickness of the connecting tube 34 is divided into two sections: the thinner first tube section 342 is connected to the insertion tube 33, and the thicker second tube section 343 is connected to the outlet tube 35. Since the cannula 33 is a flexible tube with elasticity, it is easier to enter the curved blood vessels of the human body by relying on this characteristic. However, the connecting tube 34 is a metal tube with a harder material. The connecting tube 34 is sleeved on the outer wall of the cannula 33 in its axial direction, which will make the nested part too rigid. Therefore, by reducing the thickness of the first tube part 342, the elasticity of the first tube part 342 can be improved, so that it is not too rigid and can adapt to deformation when entering the curved blood vessels of the human body.

[0070] Furthermore, a tube gap 3421 is provided between the inner wall of the first tube 342 and the outer wall of the insertion tube 33. A certain tube gap 3421 is reserved radially to allow for the dispensing operation between the first tube 342 and the insertion tube 33. At the same time, after the predetermined amount of adhesive is applied, the outer wall of the first tube 342 will not expand outward, thus avoiding the expansion of the outer diameter at the dispensing point.

[0071] Because of the tube gap 3421, it is impossible to ensure that the insertion tube 33 and the connecting tube 34 are coaxial after they are fitted together. Therefore, in the specific operation, an auxiliary positioning tool is needed to achieve coaxiality. This auxiliary positioning tool can be a cylindrical positioning post, the outer diameter of which is the same as the inner diameter of the cylindrical surface 3413a of the insertion tube 33 or the limiting protrusion ring 341. Specifically, first, the positioning post is inserted so that its outer wall fits against the cylindrical surface 3413a of the limiting protrusion ring 341. Then, the insertion tube 33 is inserted so that its inner wall fits against the outer wall of the positioning post. Finally, adhesive is applied to the tube gap 3421 between the insertion tube 33 and the connecting tube 34.

[0072] Furthermore, such as Figure 7 As shown, the first tube 342 has several perforated grooves 3422 on its upper surface. These perforated grooves 3422 are through-grooves penetrating the inner and outer walls of the first tube 342, effectively reducing its area and thus improving its elasticity. Simultaneously, during the dispensing process, dispensing can also be performed through the perforated grooves 3422 on the side of the first tube 342, allowing for multi-directional dispensing, resulting in more uniform dispensing and better adhesion. Furthermore, when the adhesive is heated and dried, it expands. If the side of the first tube 342 is a closed space, the expansion of the adhesive would increase its outer diameter. The perforated grooves 3422 can accommodate some of the adhesive, providing expansion space and preventing an increase in the outer diameter.

[0073] The hollowed-out groove 3422 can be an "I"-shaped straight groove, or a meandering "S"-shaped, "J"-shaped, or other curved grooves. In terms of arrangement, the hollowed-out groove 3422 can be arranged radially along the connecting pipe 34 or axially along the connecting pipe 34.

[0074] The cannula 33 has a certain length. To ensure better flexibility and adaptability to deformation of the cannula 33, the axial length of the first tube section 342 is 50%-80% of the axial length of the second tube section 343. This limits the maximum and minimum axial length of the first tube section 342. If it exceeds the maximum value, the length of the cannula 33 covered by the connecting tube 34 in the axial direction will be too long, making the cannula 33 too rigid, reducing its flexibility and adaptability to deformation, and making it difficult to enter curved blood vessels. If it is below the minimum value, the length of the connecting tube 34 covering the cannula 33 in the axial direction will be too short, resulting in too small a connection area with the cannula 33, insufficient connection strength, and easy breakage.

[0075] Specifically, in combination Figure 1 and Figure 8 The blood pump 1 also includes a catheter 40, which is connected to the proximal end of the drive unit 10. The catheter 40 is used to accommodate various supply lines. For example, the supply lines include wires for electrical connection to the drive unit 10 and flushing lines for introducing flushing fluid into the drive unit 10 of the blood pump 1. Optionally, the flushing fluid is physiological saline, heparinized saline, or glucose, etc.

[0076] Combination Figures 8 to 10 The drive device 10 includes a housing 100, a rotating shaft 200, a first bushing 300, a second bushing 400, and a limiting component 500.

[0077] The distal end of the housing 100 is fixed to the sleeve assembly 30, and the proximal end of the housing 100 is fixed to the conduit 40. The housing 100 is generally a cylindrical shell open at both ends. The housing 100 has an inner cavity 101 through which flushing fluid in the cleaning line flows into the inner cavity 101 from the proximal end of the housing 100 and flows out of the housing 100 from the distal end of the housing 100.

[0078] In some embodiments, the housing 100 includes a first housing 110 and a second housing 120. The proximal end of the first housing 110 is fixedly connected to the conduit 40, the distal end of the first housing 110 is fixedly connected to the proximal end of the second housing 120, and the distal end of the second housing 120 is fixedly connected to the sleeve assembly 30. The first housing 110 and the second housing 120 form an inner cavity 101 of the housing 100. The housing 100 is assembled from the first housing 110 and the second housing 120 to facilitate the installation of the rotating shaft 200, the first bushing 300, the second bushing 400, and the limiting component 500, etc., in the inner cavity 101 of the housing 100.

[0079] A rotating shaft 200 is rotatably mounted on the housing 100. The rotating shaft 200 is fixedly connected to the impeller 20 to drive the impeller 20 to rotate. The rotating shaft 200 includes a shaft portion 210 and a sliding portion 220. The shaft portion 210 is rotatably mounted on the housing 100. One end of the shaft portion 210 is fixedly connected to the sliding portion 220, and the other end of the shaft portion 210 is used to connect to the impeller 20.

[0080] The shaft portion 210 is elongated. The distal end of the shaft portion 210 is located outside the housing 100 and is used for fixed connection with the impeller 20. The impeller 20 is rotatable with the shaft portion 210. In the illustrated embodiment, the shaft portion 210 extends approximately along the axial direction of the housing 100, or in other words, the direction of extension of the axis of the shaft portion 210 is approximately the same as the axial direction of the housing 100.

[0081] The sliding portion 220 has a spherical cap surface 221. The axis of the shaft portion 210 passes through the center of the sphere containing the spherical cap surface 221. In the illustrated embodiment, the diameter of the sphere containing the spherical cap surface 221 is larger than the diameter of the shaft portion 210. Specifically, the height of the spherical cap surface 221 in the axial direction of the shaft portion 210 is greater than or equal to the radius of the sphere containing the spherical cap surface 221; in other words, the surface area of ​​the spherical cap surface 221 is at least half the surface area of ​​the sphere it contains.

[0082] Please combine them together Figure 11In the illustrated embodiment, the sliding portion 220 further includes a cylindrical surface 222 and a limiting surface 223. One end of the cylindrical surface 222 is connected to the spherical cap surface 221, and the other end is connected to the limiting surface 223. The axis of the cylindrical surface 222 coincides with the axis of the shaft portion 210, and the limiting surface 223 is perpendicular to the axis of the shaft portion 210. The limiting surface 223 is approximately circular, and the central axis of the cylindrical surface 222 passes through the center of the sphere containing the spherical cap surface 221 and also through the center of the limiting surface 223. In the illustrated embodiment, the diameter of the cylindrical surface 222 is equal to the diameter of the sphere containing the spherical cap surface 221.

[0083] It is understood that the sliding part 220 is not limited to the structure described above. In some embodiments, the sliding part 220 can also be entirely spherical. In this case, the spherical cap surface 221 is the part of the sliding part 220 that is away from the axis 210. In this case, the sliding part 220 does not have a limiting surface 223 and a cylindrical surface 222. Alternatively, the sliding part 220 does not have a cylindrical surface 222, and the limiting surface 223 is directly connected to the spherical cap surface 221.

[0084] In some embodiments, at least one of the shaft portion 210 and the sliding portion 220 is made of ceramic material. Compared to metal materials, ceramics have higher processing precision, higher biocompatibility and mechanical strength, and better wear resistance and corrosion resistance. In some embodiments, the shaft portion 210 and the sliding portion 220 are integrally formed structures; in some embodiments, the shaft portion 210 and the sliding portion 220 can also be fixed together by assembly, welding, bonding, or other methods. In some embodiments, the sliding portion 220 has a sliding body and a diamond coating on the surface of the sliding body to make the surface of the sliding portion 220 smooth and have high wear resistance; in this case, the material of the sliding body can be a material with a certain rigidity, such as metal or ceramic, and the material of the sliding body can be the same as the material of the shaft portion 210.

[0085] Combination Figure 10 and Figure 12 The first bushing 300 and the second bushing 400 are both mounted on the housing 100, and the first bushing 300 and the second bushing 400 are spaced apart along the axial direction of the housing 100. In the illustrated embodiment, the first bushing 300 and the second bushing 400 are both located in the inner cavity 101 of the housing 100, with the first bushing 300 located at the proximal end of the housing 100 and the second bushing 400 located at the distal end of the housing 100.

[0086] The first bushing 300 has a groove 310, and the sliding portion 220 of the rotating shaft 200 is movably disposed in the groove 310, so that the first bushing 300 restricts the movement of the rotating shaft 200 toward the first bushing 300. The shaft portion 210 of the rotating shaft 200 is rotatably inserted into the second bushing 400, and the second bushing 400 restricts the range of movement of the shaft portion 210 in the radial direction. The second bushing 400 has a shaft hole 410, and the shaft portion 210 of the rotating shaft 200 is rotatably inserted into the shaft hole 410. The diameter of the shaft hole 410 is slightly larger than the diameter of the portion of the shaft portion 210 of the rotating shaft 200 located in the shaft hole 410, so as to allow the shaft portion 210 to rotate relative to the second bushing 400 and to allow flushing fluid to pass through. The shaft hole 410 has a certain length along its central axis (or, in other words, the shaft hole 410 has a certain length in the axial direction of the housing 100) to limit the radial swing range of the shaft portion 210, while also limiting the radial swing range of the sliding portion 220. The radial swing range of the sliding portion 220 can be adjusted by adjusting the size of the shaft hole 410 and adjusting the length of the shaft hole 410 along its central axis.

[0087] Because the rotating shaft 200 will wobble to a certain extent when the blood pump 1 is working, such as Figure 14 As shown, particularly the end of the rotating shaft 200 furthest from the impeller 20, or the end where the rotating shaft 200 engages with the first bushing 300, exhibits a large swing amplitude. In the traditional design, the rotating shaft 200 risks being jammed by the first bushing 300. However, in this embodiment, combined with… Figure 13 and Figure 15 The spherical crown surface 221 slides against the groove wall of the groove 310, meaning the sliding part 220 swings within the groove 310 via the spherical crown surface 221. The depth h of the groove 310 is less than or equal to the height of the spherical crown surface 221 along the axial direction of the shaft 210, effectively preventing other parts of the rotating shaft 200 besides the spherical crown surface 221 from contacting the groove opening of the groove 310 and causing the rotating shaft 200 to become stuck, thereby improving the safety and reliability of the drive device 10 and the blood pump 1. If the depth h of the groove 310 is greater than the height of the spherical crown surface 221 along the axial direction of the shaft 210, part of the shaft 210 will be housed in the groove 310. When the rotating shaft 200 swings radially, there is a risk that it will be stuck in the groove 310, preventing the rotating shaft 200 from rotating and causing the pump to stop.

[0088] Specifically, the groove 310 is a spherical groove. The groove 310 has a spherical wall 312, and the spherical crown surface 221 of the sliding part 220 slides against the spherical wall 312. The radius R of the sphere containing the groove 310 (or the sphere containing the spherical wall 312) is greater than the radius r of the sphere containing the spherical crown surface 221, so that the sliding part 220 can slide within the groove 310 and has a certain space for radial swing. Specifically, the difference between the radius R of the sphere containing the spherical wall 312 and the radius r of the sphere containing the spherical crown surface 221 is defined as D, where 0.04mm ≤ D ≤ 0.06mm. By limiting the range of D, on the one hand, the assembly process difficulty of assembling the sliding part 210 into the groove 310 can be reduced, and on the other hand, the maximum swing angle of the rotating shaft 200 can be further limited, further ensuring the smooth operation of the drive device 10.

[0089] Specifically, along the axis of the first bushing 300 and towards the direction closer to the second bushing 400, the diameter of the groove 310 gradually increases. In other words, almost the entire groove wall of the groove 310 is a spherical wall 312, so that the spherical crown surface 221 of the sliding part 220 can slide more smoothly within the groove 310. The center of the sphere containing the spherical wall 312 is located on the central axis of the groove 310. In the illustrated embodiment, the central axis of the groove 310 coincides with the central axis of the first bushing 300. The central axis of the groove 310 coincides with the central axis of the shaft hole 410.

[0090] It should be noted that, in this application, the depth h of the groove 310 refers to the maximum distance from the groove wall of the groove 310 to the plane containing the groove opening when the spherical wall 312 of the groove 310 is in its complete state (i.e., the spherical wall 312 is not perforated). Figure 15 As shown, the depth h of the groove 310 is the height of the spherical notch where the spherical wall 312 is located (the bottom surface of the spherical notch coincides with the plane where the groove opening of the groove 310 is located).

[0091] In one embodiment, the depth h of the groove 310 is 0.6 to 1 times the radius R of the sphere containing the spherical wall 312, i.e., 0.6R ≤ h ≤ R. This range not only enables the groove 310 to have a radial limiting function, preventing the sliding part 220 from sliding out of the groove 310, but also makes the diameter of the groove 310 gradually increase along the axis of the first bushing 300 and towards the second bushing 400, so as to facilitate the sliding part 220 to be installed in the groove 310, and makes the groove 310 have a suitable width to meet the requirements of the radial swing range of the sliding part 220.

[0092] In one embodiment, combined with Figures 12 to 15The depth h of the groove 310 is greater than or equal to half the height of the spherical cap surface 221 in the axial direction of the shaft portion 210, so that the groove wall of the groove 310 has sufficient radial width for the sliding portion 220 to slide, and prevents the sliding portion 220 from sliding off the groove 310.

[0093] In one embodiment, the edge of the groove 310 is rounded, forming a first rounded corner 311 to prevent the sliding part 220 from being scratched and worn by the angular groove edge. Figure 12 In the illustrated embodiment, the first rounded corner 311 is located at the distal end of the spherical wall 312 so that the groove wall of the groove 310 smoothly transitions from the spherical wall 312 to the distal end face of the first bushing 300.

[0094] In some embodiments, combined with Figure 10 and Figure 11 The first bushing 300 also has a flushing fluid hole 320 for flushing fluid to flow through. The flushing fluid hole 320 is in fluid communication with the groove 310, and the diameter of the flushing fluid hole 320 is smaller than the diameter of the sphere containing the spherical wall 312. Specifically, one end of the flushing fluid hole 320 is located on the proximal end face of the first bushing 300, and the other end is located on the spherical wall 312. The flushing fluid hole 320 can communicate with the flushing line in the conduit 40, thereby enabling fluid communication with the cleaning line so that the flushing fluid can enter the groove 310 through the flushing fluid hole 320. The diameter of the flushing fluid hole 320 is smaller than the diameter of the sphere containing the spherical cap surface 221.

[0095] Specifically, the central axis of the flushing fluid hole 320 passes through the center of the groove 310, or through the center of the sphere containing the spherical wall 312, allowing the flushing fluid to effectively enter between the groove wall of the groove 310 and the sliding part 220. This not only provides lubrication, reducing the coefficient of friction between the sliding part 220 and the groove wall of the groove 310, or between the spherical cap surface 221 and the spherical wall 312, thus reducing wear on the sliding part 220 and the first bushing 300, but also provides hydraulic suspension support for the sliding part 220. The flushing fluid then flows out of the groove 310 through the opening and enters the inner cavity 101 of the housing 100. The flushing fluid hole 320 is a straight hole to reduce energy consumption of the flushing fluid within it.

[0096] In one embodiment, the flushing fluid hole 320 has a first opening 321, which is located at one end of the flushing fluid hole 320 near the groove 310. The diameter of the first opening 321 is 1 / 9 to 1 / 3 of the diameter of the spherical cap surface 221. If the diameter of the first opening 321 of the flushing fluid hole 320 is too large, the contact area between the sliding part 220 and the side wall of the groove 310 will be reduced (resulting in a larger pressure per unit area), which will increase the wear of the groove wall of the groove 310 on the sliding part 220. If the diameter of the first opening 321 is too small, it will affect the amount of flushing fluid entering the groove 310 from the flushing fluid hole 320. The flushing fluid entering the flushing fluid hole 320 provides a force to the sliding part 220 and also enters the groove wall between the sliding part 220 and the groove 310 to provide lubrication, thereby reducing the coefficient of friction between the sliding part 220 and the groove wall of the groove 310. Therefore, the amount of flushing fluid entering the groove 310 should not be too small. In addition, the edge of the first opening 321 of the flushing fluid hole 320 is provided with a second rounded corner to prevent the sliding part 220 from being scratched and worn.

[0097] In the illustrated embodiment, the first opening 321 is located on the spherical wall 312. The rinsing fluid enters through the first opening 321 between the spherical wall 312 and the spherical crown surface 221 to provide lubrication.

[0098] In some embodiments, combined with Figure 11 and Figure 16 The drive unit 10 also includes a support base 810. The support base 810 is fixed to the housing 100. The support base 810 has a mounting cavity 811 and a liquid inlet hole 814 communicating with the mounting cavity 811. The first bushing 300 is installed in the mounting cavity 811, and the flushing liquid hole 320 communicates with the liquid inlet hole 814. The end of the liquid inlet hole 814 away from the mounting cavity 811 is used to communicate with the cleaning pipeline of the conduit 40, so that the flushing liquid can flow through the liquid inlet hole 814 and the flushing liquid hole 320 into the groove wall of the groove 310 and the sliding part 220, and then flow into the inner cavity 101 of the housing 100.

[0099] In one embodiment, the mounting cavity 811 has a cavity bottom 812, and the second opening 815 of the liquid inlet 814 is located at the cavity bottom 812 of the mounting cavity 811. A support step 813 is provided inside the mounting cavity 811, and the support step 813 abuts against the first bushing 300, so that the first bushing 300 is spaced a distance from the cavity bottom 812 to better ensure the smooth flow of flushing fluid. Specifically, the support step 813 abuts against the side of the first bushing 300 facing away from the second bushing 400.

[0100] Specifically, the support base 810 also has a diversion channel 816, which is in fluid communication with the liquid inlet hole 814, so that the fluid (e.g., flushing fluid) flowing through the liquid inlet hole 814 can also flow through the diversion channel 816 to the inner cavity 101 of the housing 100. Specifically, one end of the diversion channel 816 is connected to the gap between the first bushing 300 and the bottom 812 of the mounting cavity 811, and the other end is connected to the inner cavity 101. Figure 16 In the illustrated embodiment, the diversion channel 816 is formed by a partial recess in the cavity wall of the mounting cavity 811. In other words, under normal conditions, after the flushing fluid enters the mounting cavity 811 through the inlet hole 814, it splits into two streams: one flows into the groove 310 of the first bushing 300 through the flushing fluid hole 320, and the other flows out through the diversion channel 816. The diversion channel 816 ensures the flow of flushing fluid even when the sliding portion 220 blocks the flushing fluid hole 320.

[0101] exist Figure 16 In the illustrated embodiment, there are two flow channels 816, which are arranged opposite to each other. It is understood that the number of flow channels 816 can be adjusted according to design needs; for example, in some embodiments, the number of flow channels 816 may be one or more than two.

[0102] In some embodiments, combined with Figures 8 to 10 The limiting member 500 is fixed to the shaft portion 210 and is located between the first bushing 300 and the second bushing 400. The limiting member 500 can abut against the second bushing 400, allowing the second bushing 400 to move within a certain range in the direction of the shaft portion 210 toward the second bushing 400. Specifically, the limiting member 500 may be a thrust ring 510.

[0103] In some embodiments, when the limiting member 500 abuts against the second bushing 400, the limiting member 500 does not seal the shaft hole 410 of the second bushing 400, so that the flushing fluid can flow into the shaft hole 410 of the second bushing 400 through the gap between the limiting member 500 and the second bushing 400, that is, fluid communication is achieved between the shaft hole 410 of the second bushing 400 and the inner cavity 101. Specifically, the outer diameter of the thrust ring 510 is smaller than the outer diameter of the second rotor 620 and the second bushing 400, and the outer diameter of the thrust ring 510 is larger than the diameter of the shaft hole 410. When the thrust ring 510 abuts against the second bushing 400, the thrust ring 510 keeps the second bushing 400 and the second rotor 620 at a distance. Compared with the second rotor 620 and the second bushing 400 being in direct contact, the thrust ring 510 can reduce the friction area between the second bushing 400 and the limiting member 500.

[0104] In other embodiments, the thrust ring 510 may also be composed of a plurality of fan rings arranged at uniform intervals around the circumferential shaft portion 210, or it can be understood as being composed of a plurality of fan rings arranged discretely in the circumferential direction.

[0105] Specifically, please combine Figure 17 One side of the limiting component 500 of the second bushing 400 is partially recessed to form a guide groove 420, which is connected to the shaft hole 410 of the second bushing 400. When the limiting component 500 abuts against the second bushing 400, part of the guide groove 420 is not covered by the limiting component 500. For example, when the thrust ring 510 abuts against the second bushing 400, although the thrust ring 510 blocks the gap between the shaft hole 410 and the shaft portion 210 of the second bushing 400, the guide groove 420 not covered by the thrust ring 510 can achieve fluid communication when the thrust ring 510 abuts against the second bushing 400, ensuring the smooth flow of flushing fluid. In addition, by forming the guide groove 420 by partially recessing the side of the second bushing 400 facing the limiting member 500, the flushing fluid can flow better into the space between the limiting member 500 and the second bushing 400, thereby lubricating the contact surfaces of the limiting member 500 and the second bushing 400, reducing the friction between the limiting member 500 and the second bushing 400, reducing the wear caused by the friction between the limiting member 500 and the second bushing 400, and also providing heat dissipation for the limiting member 500 and the second bushing 400.

[0106] In some embodiments, combined with Figure 10 and Figure 17 The second bushing 400 includes a first annular body 401 and a second annular body 402. The diameter of the first annular body 401 is smaller than the diameter of the second annular body 402, and the proximal end of the first annular body 401 is connected to the distal end of the second annular body 402. In the illustrated embodiment, the first annular body 401 and the second annular body 402 are integrally formed, and the second annular body 402 has a guide groove 420. The housing 100 has a mounting hole 102 adapted to the first annular body 401. The mounting hole 102 is located at the distal end of the housing 100. The inner wall of the housing 100 is provided with a limiting protrusion 103, which surrounds the mounting hole 102. The first annular body 401 is installed in the mounting hole 102, and the second annular body 402 abuts against the proximal end face of the limiting protrusion 103, thereby realizing the positioning and installation of the second bushing 400 and facilitating the stable installation of the second bushing 400.

[0107] In this embodiment, at least one of the first bushing 300, the second bushing 400, and the limiting component 500 is made of ceramic material. Compared to metal materials, ceramics have higher processing precision, higher biocompatibility, higher mechanical strength, and better wear resistance and corrosion resistance. In some embodiments, at least one of the first bushing 300 and the second bushing 400 has a bushing body and a diamond coating on the surface of the bushing body to make the surfaces of the first bushing 300 and the second bushing 400 smooth and improve wear resistance. In this case, the material of the bushing body can be a material with a certain rigidity, such as metal or ceramic.

[0108] Specifically, the roughness of at least one of the hole wall of the shaft hole 410, the surface of the shaft portion 210, the surface of the sliding portion 220, and the groove wall of the groove 310 is less than or equal to 0.1 micrometers, thereby effectively reducing the friction between the shaft portion 210 and the hole wall of the shaft hole 410, as well as the friction between the sliding portion 220 and the groove wall of the groove 310.

[0109] Combination Figure 9 , Figure 10 and Figure 18 The drive device 10 also includes a first rotor 610, which is fixed to the rotating shaft 200. The first rotor 610 is located between the first bushing 300 and the second bushing 400. There is a gap between the first rotor 610 and the first bushing 300 to avoid mutual wear between the first rotor 610 and the first bushing 300 and reduce the running resistance of the drive device 10.

[0110] Specifically, the first rotor 610 is fixed to the limiting surface 223 of the sliding portion 220. The limiting surface 223 can increase the connection area between the first rotor 610 and the rotating shaft 200, improving the connection stability of the first rotor 610. The limiting surface 223 also serves to position the first rotor 610 and limit the distance the first rotor 610 can move along the axis of the shaft portion 210 towards the first bushing 300. Optionally, the first rotor 610 is fixed to the limiting surface 223 by means of bonding, welding, etc. The cylindrical surface 222 with a certain length can increase the distance between the first rotor 610 and the first bushing 300, so as to prevent the first rotor 610 from abutting against the first bushing 300 when the rotating shaft 200 swings, causing the rotating shaft 200 to jam.

[0111] Specifically, in combination Figure 19The first rotor 610 includes a first flywheel 611 and a first magnet 612. The first flywheel 611 is fixed to the rotating shaft 200, for example, the first flywheel 611 is fixed to the limiting surface 223. The first magnet 612 is fixed to the first flywheel 611. In some embodiments, the first magnet 612 is a ring-shaped Helbeck array magnet. In the illustrated embodiment, the first rotor 610 is located in the inner cavity 101, and the first rotor 610 is rotatable relative to the housing 100 and can drive the rotating shaft 200 to rotate.

[0112] The first flywheel 611 includes a first disc-shaped portion 6111, a first inner tube 6112, and a first outer tube 6113. Both the first inner tube 6112 and the first outer tube 6113 are cylindrical structures, and the first disc-shaped portion 6111 is an annular disc structure. One end of both the first inner tube 6112 and the first outer tube 6113 is fixedly connected to the first disc-shaped portion 6111. The first inner tube 6112 and the first outer tube 6113 are located on the same side of the first disc-shaped portion 6111 and are coaxially arranged. The inner diameter of the first outer tube 6113 is larger than the outer diameter of the first inner tube 6112. The first inner tube 6112 is at least partially housed within the first outer tube 6113. A first annular cavity 6114 for accommodating the first magnet 612 is formed between the first outer tube 6113 and the first inner tube 6112. The shape of the first annular cavity 6114 is adapted to the shape of the first magnet 612 to facilitate the installation and positioning of the first magnet 612. This arrangement allows the first flywheel 611 to limit the movement of the first magnet 612, facilitating the installation of the first magnet 612 and making the connection between the first magnet 612 and the first flywheel 611 more secure. Figure 11 As shown, the limiting surface 223 of the sliding part 220 is fixedly connected to the surface of the first disc-shaped part 6111 that is opposite to the first magnet 612.

[0113] It should be noted that the first flywheel 611 is not limited to the structure described above. In some embodiments, the first flywheel 611 does not have a first external tube 6113; in some embodiments, the first flywheel 611 does not have a first external tube 6113 and a first internal tube 6112. In this case, the shaft portion 210 is fixedly inserted through the center of the first disc-shaped portion 6111. Compared to the first flywheel 611 which only has a first disc-shaped portion 6111, providing a first internal tube 6112 allows for a more stable connection between the first flywheel 611 and the shaft portion 210. The shaft portion 210 can be fixed to the first disc-shaped portion 6111 by various methods such as welding or bonding. The shaft portion 210 can also be fixed to the first flywheel 611 by being relatively stationary with the first disc-shaped portion 6111 through a limiting structure. The shaft portion 210 can also be fixed to the first flywheel 611 by having a plane at the contact surface between it and the first internal tube 6112, allowing the shaft portion 210 to rotate synchronously with the first flywheel 611. It is understood that in some embodiments, the first flywheel 611 may be omitted, in which case the first magnet 612 may be directly fixed on the shaft 210.

[0114] In some embodiments, combined with Figure 9 and Figure 10 The drive device 10 also includes a stator 700. The stator 700 and the first rotor 610 are arranged along the axis of the shaft portion 210, with the stator 700 located between the first bushing 300 and the second bushing 400. The stator 700 is capable of driving the first rotor 610 to rotate. Specifically, the stator 700 is capable of generating a rotating magnetic field that drives the first magnet 612 to rotate. By arranging the first rotor 610 and the stator 700 along the axis of the shaft portion 210, the overall diameter of the drive device 10 can be reduced. In the illustrated embodiment, the stator 700 is fixedly mounted on the housing 100, and the stator 700 is specifically located in the inner cavity 101; the shaft portion 210 rotatably passes through the stator 700.

[0115] In the illustrated embodiment, the stator 700 is located between the first rotor 610 and the limiting member 500.

[0116] In some embodiments, the drive device 10 further includes a second rotor 620, which is fixedly connected to the shaft portion 210 and located between the first bushing 300 and the second bushing 400. In the illustrated embodiment, a limiting member 500 is located between the second rotor 620 and the second bushing 400. The limiting member 500 is fixedly connected to at least one of the second rotor 620 and the shaft portion 210, such that the limiting member 500, the rotating shaft 200, and the second rotor 620 rotate and move synchronously. In other words, the limiting member 500 may be directly fixed only to the second rotor 620, directly fixed only to the shaft portion 210, or directly fixed to both the second rotor 620 and the shaft portion 210 simultaneously.

[0117] In one embodiment, combined with Figure 8 , Figure 9 and Figure 20 One specific structure of the second rotor 620 includes a second flywheel 621 and a second magnet 622. The second flywheel 621 is fixed to the shaft portion 210, and the second magnet 622 is fixed to the second flywheel 621. In some embodiments, the second magnet 622 is a ring-shaped Helbeck array magnet. It is understood that the structure of the second flywheel 621 can be the same as the structure of the first flywheel 611, and will not be described in detail here.

[0118] In the illustrated embodiment, the thrust ring 510 is an annular protrusion formed on the side of the second flywheel 621 opposite to the first rotor 610. The thrust ring 510 and the second flywheel 621 are integrally molded, forming a single unit. Since the overall volume of the blood pump 1 is small, the thrust ring 510 is even smaller, making machining difficult and assembly challenging. Integrating the thrust ring 510 and the second flywheel 621 into a single unit facilitates installation and eliminates the need for adhesive bonding.

[0119] It is understood that in other embodiments, the thrust ring 510 and the second rotor 620 may also be separate structures before assembly. In this case, the thrust ring 510 may be fixed together with at least one of the second rotor 620 or shaft 210 by means of bonding or welding.

[0120] In some embodiments, combined with Figure 9 , Figure 10 and Figure 21 The stator 700 includes a magnetic core 710 and a coil 720, with the coil 720 wound around the magnetic core 710. The magnetic core 710 is generally cylindrical, meaning it lacks a wide head (i.e., pole shoe). Compared to a magnetic core 710 with pole shoes, the cylindrical structure of the magnetic core 710 reduces magnetic losses and increases the magnetic coupling density between the magnetic core 710 and the first magnet 612 and the second magnet 622, thereby increasing the torque of the stator 700 on the first magnet 612 and the second magnet 622 (under equal current conditions). Furthermore, the headless magnetic core 710 significantly reduces the problem of localized magnetic short circuits and reduced motor power caused by contact between adjacent magnetic cores 710. Specifically, the extending direction of the magnetic core 710 is aligned with the axial direction of the housing 100 or the axis of the shaft portion 210.

[0121] The first rotor 610, stator 700, and second rotor 620 are arranged sequentially along the axis of the shaft portion 210. In the illustrated embodiment, the stator 700 includes a first stator unit 701 and a second stator unit 702 arranged along the axis of the shaft portion 210, wherein both the first stator unit 701 and the second stator unit 702 include the aforementioned magnetic core 710 and the aforementioned coil 720. The first stator unit 701 is capable of driving the first rotor 610 to rotate, and the second stator unit 702 is capable of driving the second rotor 620 to rotate. Specifically, the first stator unit 701 is capable of generating a rotating magnetic field that drives the first rotor 610 to rotate, and the second stator unit 702 is capable of generating a rotating magnetic field that drives the second rotor 620 to rotate. The first stator unit 701 and the second stator unit 702 are both fixedly housed within the inner cavity 101 of the housing 100. The shaft portion 210 is rotatably disposed through the first stator unit 701 and the second stator unit 702. The first rotor 610, the first stator unit 701, the second rotor 620, and the second stator unit 702 are arranged sequentially along the axial direction.

[0122] Specifically, the drive device 10 further includes a magnetic conductor 820 fixedly connected to the housing 100. The magnetic core 710 of the first stator unit 701 and the magnetic core 710 of the second stator unit 702 are both fixedly connected to the magnetic conductor 820. In some embodiments, the magnetic conductor 820 is snapped into the inner sidewall of the housing 100. The shaft portion 210 is rotatably disposed through the magnetic conductor 820. The magnetic conductor 820 serves to close the magnetic circuit, thereby promoting and increasing the generation of magnetic flux and improving coupling capability. Therefore, the magnetic conductor 820 can close the magnetic circuit between the first stator unit 701 and the first rotor 610, and close the magnetic circuit between the second stator unit 702 and the second rotor 620, thereby increasing the magnetic flux. Furthermore, the arrangement of the magnetic conductor 820 helps to reduce the overall diameter of the drive device 10. Furthermore, by fixing the magnetic cores 710 of the first stator unit 701 and the second stator unit 702 to the magnetic conductor 820, the positioning and installation of the first stator unit 701 and the second stator unit 702 can be achieved by directly fixing the magnetic conductor 820 to the housing 100, thus reducing the assembly difficulty of the first stator unit 701 and the second stator unit 702. At the same time, the magnetic conductor 820 configured in the above manner can also reduce the need for positioning structures within the housing 100, thereby simplifying the structure of the housing 100 and the assembly process of the entire drive device 10.

[0123] Specifically, the magnetic conductive component 820 includes two magnetic conductive plates 821, which are stacked. One magnetic conductive plate 821 is fixedly connected to the magnetic core 710 of the first stator unit 701, and the other magnetic conductive plate 821 is fixedly connected to the magnetic core 710 of the second stator unit 702. The shaft portion 210 is rotatably disposed through the two magnetic conductive plates 821. Optionally, the two magnetic plates 821 are separate before assembly. By setting the magnetic components 820 as two separate magnetic plates 821 before assembly, when assembling the drive device 10, the magnetic core 710 of the first stator unit 701 can be fixed to one of the magnetic plates 821, and the magnetic core 710 of the second stator unit 702 can be fixed to the other magnetic plate 821. Then, the two magnetic plates 821 are stacked. In this way, the first stator unit 701 and the second stator unit 702 can be conveniently assembled to the two magnetic plates 821 respectively, making the assembly of the first stator unit 701 and the second stator unit 702 more convenient.

[0124] Specifically, the two magnetic plates 821 are fixedly connected, thereby enabling the first stator unit 701, the second stator unit 702, and the magnetic conductor 820 to form a single unit and be assembled into the housing 100, making the assembly of the stator 700 easier. For example, the two magnetic plates 821 can be connected together by adhesive or welding. It is understood that in other embodiments, the two magnetic plates 821 are not fixedly connected, but are in contact with each other.

[0125] It should be noted that the magnetic conductor 820 is not limited to the above-described configuration of two separate magnetic conductor plates 821. The magnetic conductor 820 can also be a plate-like structure, i.e., the magnetic conductor 820 is a single magnetic conductor plate 821, in which case the first stator unit 701 and the second stator unit 702 share the same magnetic conductor plate 821. Specifically, the magnetic conductor plate 821 is made of silicon steel, and the magnetic core 710 is also made of silicon steel.

[0126] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A drive device characterized by comprising: include: A housing having an internal cavity; A stator, which is fixedly mounted to the housing and located in the inner cavity; A rotating shaft rotatably disposed on the housing, the rotating shaft including a shaft portion and a sliding portion disposed at one end of the shaft portion, the shaft portion being installed in the inner cavity of the housing, the end of the shaft portion away from the sliding portion being located outside the housing for connection with an impeller, the sliding portion having a spherical crown surface; A first bushing is installed on the housing. The first bushing has a groove. The sliding part is movably disposed in the groove, and the spherical crown surface slides against the groove wall. A second bushing is mounted on the housing, wherein the shaft portion is rotatably inserted through the second bushing; The second rotor, the stator and the second rotor are both located between the first bushing and the second bushing, and the second rotor is fixed to the shaft; the stator can drive the second rotor to rotate; A limiting component is fixedly connected to at least one of the shaft and the second rotor, the limiting component is located between the second rotor and the second bushing, and the limiting component is capable of abutting against the second bushing; The groove has a spherical wall, and the spherical crown surface slides against the spherical wall. The radius of the sphere containing the spherical wall is greater than the radius of the sphere containing the spherical crown surface. The diameter of the groove gradually increases along the axis of the first bushing and toward the second bushing. And / or, the groove has an opening, the edge of the opening is rounded, the edge of the opening has a first rounded corner, and the sliding part passes through the opening of the groove.

2. The drive apparatus according to claim 1, characterized by: The diameter of the sphere containing the spherical cap surface is greater than the diameter of the shaft portion; and / or, the height of the spherical cap surface in the axial direction of the shaft portion is greater than the radius of the sphere containing the spherical cap surface.

3. The drive apparatus according to claim 1, characterized by: The drive device further includes a first rotor, which is fixedly connected to the shaft portion. The first rotor is located between the first bushing and the second bushing, and there is a gap between the first rotor and the first bushing. The sliding part also has a cylindrical surface and a limiting surface. One end of the cylindrical surface is connected to the spherical cap surface, and the other end is connected to the limiting surface. The axis of the cylindrical surface coincides with the axis of the shaft part, and the limiting surface is perpendicular to the axis of the shaft part. The first rotor abuts against the limiting surface.

4. The drive apparatus according to claim 3, characterized by: The first rotor includes a first flywheel and a first magnet; wherein, the first flywheel includes a first disc-shaped portion, a first inner tube and a first outer tube, one end of the first inner tube and the first outer tube are both fixedly connected to the first disc-shaped portion to form a first annular cavity between the first outer tube and the first inner tube; the first magnet is installed in the first annular cavity; The shaft portion of the rotating shaft passes through the first internal tube and is fixedly connected to the first internal tube; the limiting surface of the sliding portion is fixedly connected to the surface of the first disc-shaped portion opposite to the first magnet.

5. The drive apparatus according to any one of claims 1 to 4, characterized by: The second rotor includes a second flywheel and a second magnet. The second flywheel is fixed to the shaft portion, and the second magnet is fixed to the second flywheel. The limiting component is a thrust ring, which is formed on the side of the second flywheel opposite to the first rotor.

6. The drive apparatus according to claim 1, characterized by: The drive device further includes a support base; the support base has an installation cavity and a liquid inlet hole communicating with the installation cavity, and the first bushing is installed in the installation cavity; the first bushing also has a flushing liquid hole for flushing liquid to flow through, and the flushing liquid hole is communicating with the liquid inlet hole; The mounting cavity has a bottom, and the second opening of the liquid inlet is located at the bottom of the mounting cavity. A support step is provided inside the mounting cavity, and the support step abuts against the side of the first bushing that is away from the second bushing, so that the first bushing is spaced a distance from the bottom of the cavity.

7. The drive apparatus according to any one of claims 1 to 4, characterized by: The depth of the groove is less than or equal to the height of the spherical cap surface in the axial direction of the shaft.

8. The drive apparatus according to claim 7, characterized by: The depth of the groove is greater than or equal to half the height of the spherical cap surface in the axial direction of the shaft.

9. The drive apparatus according to any one of claims 1 to 4, characterized by The groove has a spherical wall, and the spherical cap surface slides against the spherical wall. The difference between the radius of the sphere containing the spherical wall and the radius of the sphere containing the spherical cap surface is defined as D, where 0.04 mm ≤ D ≤ 0.06 mm. Alternatively, the groove has a spherical wall, the spherical crown surface slides against the spherical wall, and the depth of the groove is 0.6 to 1 times the radius of the sphere containing the spherical wall.

10. The drive apparatus according to any one of claims 1 to 4, characterized by: The first bushing is provided with a flushing fluid hole, the flushing fluid hole having a first opening located on the spherical wall to communicate with the groove, and the other end opening of the flushing fluid hole located on the proximal end face of the first bushing to communicate with the flushing pipeline; the edge of the first opening is provided with a second rounded corner.

11. A blood pump, characterized by: The device includes a cannula assembly, an impeller, and a drive device as described in any one of claims 1 to 10; the cannula assembly has a blood inlet and a blood outlet, and the cannula assembly is fixedly connected to the distal end of the housing of the drive device; the impeller is rotatably housed in the cannula assembly, the impeller is connected to the end of the shaft portion away from the sliding portion, and the impeller is rotatable with the shaft portion.

Images