Centrifugal pump

Abstract

The present application relates to a kind of centrifugal pumps, including pump body device and driving device, pump body device and driving device are detachably connected, pump body device includes first shell, impeller and first centering structure, impeller is housed in first shell, first centering structure is arranged in the circumferential side wall of impeller, driving device also includes second shell and second centering structure, second centering structure is connected with the side wall of second shell, second centering structure is arranged around first centering structure, first centering structure and second centering structure are attracted to make impeller suspend in first shell.By pump body device and driving device detachably connected, it is easy to accumulate thrombus Pump body device can be detachably replaced, when centrifugal pump is damaged, only pump body device needs to be replaced, avoid the overall replacement of centrifugal pump, reduce the use cost.

Description

Technical Field

[0001] This invention relates to the field of medical devices, and in particular to a centrifugal pump. Background Technology

[0002] This section provides only background information relevant to this disclosure and is not necessarily prior art.

[0003] As the chamber through which blood is pumped, the pump casing is prone to accumulating blood clots, causing blockages and damage. In existing technologies, centrifugal pumps are usually integrated with the pump casing and drive mechanism. This means that when the pump casing is damaged, it needs to be replaced along with the drive mechanism, resulting in high replacement and maintenance costs for centrifugal pumps. Summary of the Invention

[0004] Based on this, it is necessary to provide a centrifugal pump, including a pump body assembly and a drive unit, the pump body assembly and the drive unit being detachably connected. The pump body assembly includes a first housing, an impeller and a first centering structure. The impeller is housed within the first housing, and the first centering structure is disposed on the circumferential sidewall of the impeller. The drive unit also includes a second housing and a second centering structure. The second centering structure is connected to the sidewall of the second housing and is disposed around the first centering structure. The first centering structure and the second centering structure attract each other to suspend the impeller within the first housing.

[0005] Optionally, the first centering structure includes a hollow volumetric structure and a magnetic fluid, the volumetric structure being arranged circumferentially along the impeller, and the magnetic fluid being located within the volumetric structure.

[0006] Optionally, the volume structure is a C-shaped groove structure, which is connected to the side wall of the impeller. The second centering structure includes a C-shaped iron core, with the opening of the C-shaped iron core facing the opening of the C-shaped groove.

[0007] Optionally, the C-shaped iron core includes a first end and a second end, and the C-shaped groove structure includes a third end and a fourth end, with the first end and the third end being flush and the second end and the fourth end being flush.

[0008] Optionally, the impeller includes blades and a mounting section, the mounting section including a sealed cavity structure, the blades being connected to the outer wall of the mounting section, and a first centering structure being mounted on the inner side of the mounting section.

[0009] Optionally, the first housing includes a protrusion that extends toward the side of the first housing closer to the second housing, and the inner side of the protrusion forms an accommodating space for the mounting portion.

[0010] Optionally, the drive device further includes a second housing, a groove is provided on the end face of the second housing, a protrusion is inserted into the groove, and a second centering structure is connected to the side wall of the groove.

[0011] Optionally, the drive device further includes a drive mechanism, which is installed inside the second housing. The drive mechanism includes a rotor, a mounting base, a first bearing, and a second bearing. The mounting base is connected to the inner wall of the second housing. The first bearing and the second bearing are coaxially mounted on the mounting base, and the rotor is inserted into the first bearing and the second bearing.

[0012] Optionally, the drive unit also includes a preload element that connects the bearing and the rotor.

[0013] Optionally, a first annular magnet is also provided inside the impeller, and a second annular magnet is provided on the side of the drive device opposite to the pump body device, with the first annular magnet and the second annular magnet repelling each other.

[0014] Compared with the prior art, the centrifugal pump described in this invention has the following advantages:

[0015] The pump body and drive unit are detachably connected, allowing the pump body, which is prone to thrombus accumulation, to be easily removed and replaced. When the centrifugal pump is damaged, only the pump body needs to be replaced, avoiding the need to replace the entire centrifugal pump and reducing operating costs. The impeller is housed within the first housing, allowing it to rotate and suspend within the housing. The drive mechanism is indirectly connected to the impeller, enabling it to rotate within the first housing. The blood flow within the first housing is pumped to the outlet by the rotating impeller, thus realizing the pumping function of the pump body. A first centering structure is circumferentially arranged around the impeller, and a second centering structure... The structure is connected to the inner wall of the second housing and is positioned opposite to the first centering structure, so that the first and second centering structures attract each other. The impeller is suspended at the center of the first housing under the attraction of the first and second centering structures, ensuring the rotational stability of the impeller within the first housing. The first centering structure is positioned on the impeller, and the second centering structure is positioned inside the second housing, so that the first and second centering structures are distributed in different housings. When the pump body needs to be replaced, the second centering structure is retained in the second housing, thereby further reducing the replacement cost of the pump body. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the isometric structure of the centrifugal pump in Embodiment 1 of the present invention;

[0017] Figure 2 This is an exploded structural diagram of the pump body device and drive device in Embodiment 1 of the present invention;

[0018] Figure 3 This is a schematic cross-sectional view of the centrifugal pump in Embodiment 1 of the present invention;

[0019] Figure 4 This is an exploded structural diagram of the pump body device in Embodiment 1 of the present invention;

[0020] Figure 5 This is a cross-sectional structural diagram of the impeller and drive device in Embodiment 1 of the present invention;

[0021] Figure 6 For the present invention Figure 5 Enlarged schematic diagram of the structure at point A in the diagram;

[0022] Figure 7 This is a schematic diagram of the installation structure of the first centering structure and the second centering structure in Embodiment 1 of the present invention;

[0023] Figure 8 This is a schematic diagram of the mating structure of the first centering structure and the second centering structure in Embodiment 1 of the present invention;

[0024] Figure 9 This is a schematic diagram of the combination structure of the volume structure and the magnetic fluid in Embodiment 1 of the present invention;

[0025] Figure 10 This is an isometric schematic diagram of the second centering structure in Embodiment 1 of the present invention;

[0026] Figure 11 This is a schematic diagram of the impeller structure in Embodiment 1 of the present invention;

[0027] Figure 12 This is a cross-sectional structural diagram of the impeller in Embodiment 1 of the present invention;

[0028] Figure 13 This is a schematic diagram of the drive device in Embodiment 1 of the present invention;

[0029] Figure 14 This is an exploded view of the driving device in Embodiment 1 of the present invention.

[0030] Figure 15 This is a cross-sectional schematic diagram of a portion of the structure of the driving device in Embodiment 1 of the present invention;

[0031] Figure 16 This is an isometric schematic diagram of the first and second magnets in Embodiment 1 of the present invention;

[0032] Figure 17 This is a schematic diagram of the open magnetic circuit magnetization method in Embodiment 1 of the present invention;

[0033] Figure 18 This is a schematic diagram of the centrifugal pump in Embodiment 2 of the present invention;

[0034] Figure 19 This is an exploded structural diagram of the centrifugal pump in Embodiment 2 of the present invention;

[0035] Figure 20 This is a schematic diagram of the impeller structure of the centrifugal pump in Embodiment 2 of the present invention;

[0036] Figure 21 For the present invention Figure 19 Enlarged schematic diagram of the structure at point A in the diagram;

[0037] Figure 22 For the present invention Figure 18 Enlarged schematic diagram of the structure at point B in the diagram;

[0038] Figure 23 For the present invention Figure 22 A magnified schematic diagram of the structure at point C. Detailed Implementation

[0039] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0041] Example 1

[0042] An embodiment of the present invention provides a centrifugal pump 100, such as Figures 1 to 3 As shown, it includes a pump body assembly 110 and a drive unit 120; wherein,

[0043] The pump body device 110 includes a first housing 111 and an impeller 112. The first housing 11 has a cavity structure and has an inlet hole 1111 and an outlet hole 1112. The impeller 112 is housed in the first housing 111 and can be suspended and rotated in the first housing 111. The impeller 112 is used to pump the blood flowing from the inlet hole 1111 into the first housing 111 to the outlet hole 1112 under the drive of the drive device 120.

[0044] The drive device 120 includes a second housing 121 and a drive mechanism 122. The second housing 121 has a cavity structure and is detachably connected to the first housing 111. The drive mechanism 122 is installed inside the second housing 121. The drive mechanism 122 and the impeller 112 transmit torque through magnetic force, and the drive mechanism 122 drives the impeller 112 to rotate through magnetic force.

[0045] It also includes a first centering structure 130 and a second centering structure 140. The first centering structure 130 is arranged around the impeller 112 in the circumferential direction. The second centering structure 140 is connected to the inner wall of the second housing 121 and is arranged opposite to the first centering structure 130. The first centering structure 130 and the second centering structure 140 attract each other so that the impeller 112 is suspended in the first housing 111.

[0046] like Figure 4 As shown, the first housing 111 has a cavity structure, including an upper volute 1113 and a lower volute 1114. The upper volute 1113 and the lower volute 1114 are detachably connected, for example, by threaded connection, bolt fastening connection, or snap-fit ​​connection. The upper volute 1113 and the lower volute 1114 are fastened together to form a receiving space for the impeller 112. An inflow hole 1111 is provided on the first housing 111. The axis of the inflow hole 1111 is perpendicular to the upper volute 1113 and is located near the center of the upper volute 1113. An outlet 1112 is also provided on the first housing 111. The outlet 1112 is arranged along the tangent of the first housing 111 and also passes through the upper volute 1113 and / or the lower volute 1114. Impeller 112 is located within the first housing 111. During the operation of the centrifugal pump 100, impeller 112 is suspended within the first housing 111. Impeller 112 includes at least one of open impeller, semi-open impeller, or closed impeller. During the operation of the pump body device 110, blood enters the first housing 111 through inlet 1111 and then flows out through outlet 1112 under the centrifugal force generated by the rotation of impeller 112. It is understood that the first housing 11 can be made of materials such as biocompatible plastics or medical-grade stainless steel. The biocompatible plastic can include any one of modified polytetrafluoroethylene, polyimide, polydimethylsiloxane, and polyethylene terephthalate.

[0047] like Figure 5 As shown, the second housing 121 has an annular cavity structure. The second housing 121 includes a base 1212 and a cover 1211. The cover 1211 is fastened to the base 1212, and the cover 1211 and the base 1212 together form the mounting space for the drive mechanism 122. The drive mechanism 122 is mounted on the base 1212 and is used to drive the impeller 112 to rotate, thereby realizing the pumping function of the pump body device 110. The drive mechanism 122 can be any one of a hollow cup micro motor, a micro DC brushless motor, a micro DC iron core motor, or a fractional-slot concentrated winding motor.

[0048] Please return Figure 1 and Figure 2The second housing 121 and the first housing 111 are detachably connected, for example, by snap-fit ​​connection, rotational snap-fit ​​connection, or bolt fastening connection. During use, when the pump body assembly 110 is damaged, the connection between the second housing 121 and the first housing 111 can be disconnected, thereby disassembling the drive unit 120 and the pump body assembly 110, reducing the maintenance and replacement costs of the centrifugal pump 100.

[0049] like Figure 5 As shown, a first magnet 1121 is provided at one end of the impeller 112 near the drive mechanism 122. The drive mechanism 122 includes a rotor 1221, and a second magnet 1222 is provided at one end of the rotor 1221 near the impeller 112. The first magnet 1121 and the second magnet 1222 are in a state of mutual attraction, thereby realizing the magnetic connection between the drive mechanism 122 and the impeller 112. During the operation of the drive mechanism 122, the rotor 1221 rotates, and the rotor 1221 drives the impeller 112 to rotate through the attraction between the first magnet 1121 and the second magnet 1222, thereby realizing the drive of the impeller 112.

[0050] like Figure 7 , Figure 8 As shown, the pump body assembly further includes a first centering structure 130, and the drive mechanism 122 further includes a second centering structure 140. The first centering structure 130 is mounted on the impeller 112 and arranged circumferentially around the impeller 112. The second centering structure 140 is mounted on the second housing 121 and arranged circumferentially around the impeller 112. The second centering structure 140 is located outside the first centering structure 130. The first centering structure 130 and the second centering structure 140 attract each other to achieve radial centering of the impeller 112. It can be understood that the first centering structure 130 and the second centering structure 140 can be made of permanent magnet materials. For example, the permanent magnet material can be magnetic stainless steel, AlNiCo permanent magnet alloy, IronChromiumCo permanent magnet alloy, permanent magnet ferrite, rare earth permanent magnet material, or composite permanent magnet material.

[0051] Thus, the pump body device 110 and the drive device 120 are detachably connected, allowing the pump body device 110, which is prone to thrombus accumulation, to be easily replaced. When the centrifugal pump 100 is damaged, only the pump body device 110 needs to be replaced, avoiding the need for a complete replacement of the centrifugal pump 100 and reducing operating costs. The impeller 112 is housed within the first housing 111, allowing it to suspend and rotate within the housing. The drive mechanism 122 is indirectly connected to the impeller 112, enabling it to drive the impeller 112 to rotate within the first housing 111. The blood flow within the first housing 111 is pumped to the outlet 1112 by the rotation of the impeller 112, thus realizing the pumping function of the pump body device 110. The first centering structure 130 is circumferentially arranged around the impeller 112, and the second... The centering structure 140 is connected to the inner wall of the second housing 121 and is opposite to the first centering structure 130, so that the first centering structure 130 and the second centering structure 140 attract each other. The impeller 112 is suspended at the center of the first housing 111 under the attraction of the first centering structure 130 and the second centering structure 140, which ensures the rotational stability of the impeller 112 in the first housing 111. The first centering structure 130 is set on the impeller 112 and the second centering structure 140 is set in the second housing 121, so that the first centering structure 130 and the second centering structure 140 are distributed in different housings. When the pump body device 110 needs to be replaced, the second centering structure 140 is retained in the second housing 121, thereby further reducing the replacement cost of the pump body device 110.

[0052] Please return Figure 5 and Figure 7 The mounting part 1123 includes a closed cavity structure. A first annular magnet 1124 is provided at the center of the bottom of the mounting part 1123, and a second annular magnet 1224 is provided at the center of the axial end face of the rotor 1221. The first annular magnet 1124 and the second annular magnet 1224 repel each other.

[0053] Since the drive mechanism 122 and the impeller 112 transmit torque through magnetic force, during the rotation of the impeller 112 driven by the drive mechanism 122, the drive mechanism 122 and the impeller 112 are attracted to each other, causing the impeller 112 to experience a pulling force towards the drive mechanism 122. This causes the first centering structure 130 to also experience a pulling force towards the drive mechanism 122. Under the action of this pulling force towards the drive mechanism 122, the first centering structure 130 and the second centering structure 140 are axially misaligned (i.e., have a certain axial gap) to generate a tilting pulling force to counteract the pulling force towards the drive mechanism 122. Therefore, the first centering structure 130 will inevitably be located below the second centering structure 140. Thus, the impeller... The impeller 112 moves toward the side closer to the drive mechanism 122, reducing the gap between the impeller 112 and the first housing 111. On the one hand, this increases the shear force of the impeller 112 on the blood flow, weakening the pump's anti-hemolytic performance. On the other hand, because the impeller 112 is closer to the drive mechanism 122, the attraction between the drive mechanism 122 and the impeller 112 increases. The second centering structure 140 needs to provide a greater attraction to maintain the centering of the impeller 112, thereby increasing the energy consumption and heat generation of the second centering structure 140. Furthermore, because the first centering structure 130 and the second centering structure 140 are misaligned, their magnetic fields are misaligned, reducing magnetic efficiency.

[0054] In this way, by setting the first annular magnet 1124 and the second annular magnet 1224 to repel each other, the repulsive force of the first annular magnet 1124 and the second annular magnet 1224 can cancel the attractive force between the drive mechanism 122 and the impeller 112 and the gravity of the impeller 112 itself, thereby maintaining the first centering structure 130 and the second centering structure 140 on the same plane, and thus maximizing the magnetic force of the first centering structure 130 and the second centering structure 140.

[0055] like Figure 8 As shown, there are multiple second centering structures 140, which are arranged at circumferential intervals along the impeller 112. Multiple position sensors (not shown in the figure) are also included. The position sensors are located in the gap between two circumferentially adjacent second centering structures 140. The position sensors are used to detect the distance between the first centering structure 130 and the second centering structure 140.

[0056] In this embodiment, there are multiple second centering structures 140, which are spaced apart circumferentially around the first centering structure 130. Each second centering structure 140 includes an iron core and a coil. The coil is wound around the iron core. When the coil is energized, it works with the iron core to form a magnetic field that attracts the first centering structure 130. The combined action of the first centering structure 130 and the multiple second centering structures 140 maintains the radial centering of the impeller 112.

[0057] The position sensor includes a Hall position sensor, which is used to detect the distance between the first alignment structure 130 and the second alignment structure 140, and outputs a differential signal of the distance between the first alignment structure 130 and the second alignment structure 140. The control circuit controls the current of the coils on different second alignment structures 140 according to the magnitude of the differential signal value to achieve radial alignment of the impeller 112.

[0058] like Figure 9 As shown, the first centering structure 130 includes a volume structure 131 and a magnetic fluid 132. The volume structure 131 is arranged circumferentially around the impeller 112, and the magnetic fluid 132 is filled in the volume structure 131 and can flow in the volume structure 131.

[0059] It should be noted that the magnetic fluid 132 includes iron mortar, magnetic fluid, or nano-magnetic solid particles. The volumetric structure 131 is an annular cavity structure, connected to the sidewall of the impeller 112 and arranged circumferentially along the impeller 112. The magnetic fluid 132 fills the volumetric structure 131 and can flow within it. The spatial distribution and density distribution of the magnetic fluid 132 within the volumetric structure 131 can change accordingly with variations in the force applied to the impeller 112.

[0060] During the rotation of the impeller 112, especially when the human heart still has a certain pumping function, the blood flow rate and pressure fluctuate periodically. Under the influence of blood flow, the impeller 112 is easily disturbed. Therefore, by filling the first centering structure 130 with magnetic fluid 132, based on the principle of minimum energy, when the impeller is disturbed, the magnetic fluid on the first centering structure 130 can spontaneously gather towards the point of minimum energy, thereby maintaining the dynamic balance of the impeller 112 during rotation and increasing the rotational stability of the impeller 112.

[0061] For example, in one embodiment, when the impeller 112 is eroded by the blood flow and deviates from the axis, the magnetofluid in the first centering structure 130 spontaneously moves toward the side that has not tilted, increasing the density of the magnetofluid 132 away from the tilted side, increasing the magnetic force between the magnetofluid 132 away from the tilted side and the second centering structure 140, reducing the degree of tilt of the impeller 112, and ensuring the balance and stability of the impeller 112.

[0062] It is understood that in other embodiments, grooves can be formed on the inner wall of the impeller 112 to form a volumetric structure 131. For example, in one embodiment, an annular groove is formed on the circumferential sidewall of the impeller 112, and the magnetic fluid 132 is filled in the annular groove to form a first centering structure 130. After the magnetic fluid 132 is filled in the annular groove, a sealing cover is placed on the opening of the annular groove to form a seal and prevent the magnetic fluid 132 from overflowing.

[0063] like Figures 8 to 10 As shown, the volume structure 131 is a C-shaped groove structure, which is connected to the side wall of the impeller 112. The second centering structure 140 includes a C-shaped iron core 141 and a coil. The coil is wound in the groove of the C-shaped iron core 141. The opening of the C-shaped groove is opposite to the opening of the C-shaped iron core 141, and the end face of the C-shaped iron core 141 is flush with the end face of the opening of the C-shaped groove.

[0064] The open end face of the C-shaped iron core 141 is connected to the inner wall of the second housing 121, for example, by welding, adhesion, or snap-fit. A cable is wound back and forth along the side of the groove away from the opening to form a coil. When the coil is energized, the magnetization direction of the C-shaped iron core 141 is radially arranged along the impeller 112. The C-shaped iron core 141 includes a first end 1411 and a second end 1412. The first end 1411 of the C-shaped iron core exhibits a first polarity, and the second end 1412 of the C-shaped iron core exhibits a second polarity; the first and second polarities are opposite. The volume structure 131 includes a third end 1321 and a fourth end 1322, which are spaced apart. The third end 1321 and the fourth end 1322 are connected on the side away from the second centering structure 140 to form an annular flow channel 1323, within which the magnetofluid 132 can flow. The fact that the end face of the C-type iron core 141 is flush with the end face of the first centering structure 130 means that the first end 1411 of the C-type iron core 141 is flush with the third end 1321 of the volume structure 131, and the second end 1412 of the C-type iron core 141 is flush with the fourth end 1322 of the volume structure 131.

[0065] In this way, by setting the opening of the C-shaped groove structure opposite to the opening of the C-shaped iron core, under the attraction of the first end 1411, some of the magnetic fluid 132 gathers towards the third end 1321; under the attraction of the second end 142, some of the magnetic fluid 132 gathers towards the fourth end 1322. This makes the magnetic fluid 132 in the first end 1411 and the third end 1321 mutually attractive. The magnetic fluid 132 in the annular flow channel 1323, which is far away from the third end 1321 and the fourth end 1322, is less affected by the magnetic force of the C-shaped iron core and can still flow in the annular flow channel 1323. This reduces the influence of the centering magnetic force on the magnetic fluid 132 flowing towards the low-energy region, thus ensuring the centering effect and dynamic balance of the impeller 112.

[0066] like Figure 11 , Figure 12 As shown, the impeller 112 includes a mounting portion 1123 and multiple blades 1122. The blades 1122 are mounted on the end face of the mounting portion 1123 away from the drive mechanism 122. The mounting portion 1123 has an annular cavity structure. The first centering structure 130 is housed in the mounting portion 1123 and connected to the side wall of the mounting portion 1123. The opening of the first centering structure 130 is arranged facing the radial center away from the impeller 112.

[0067] Multiple blades 1122 are spaced circumferentially around the mounting portion 1123 on the end face of the mounting portion 1123 away from the drive mechanism 122. All blades are arranged around the center of the mounting portion 1123. The blades 1122 can be integrally cut, welded, bolted, or snapped onto the mounting portion 1123. Specifically, the blades 1122 in the impeller 112 are spaced around the center of the mounting portion 1123, and each blade 1122 has an inner end near the center of the mounting portion 1123 and an outer end away from the center of the mounting portion 1123. In this embodiment, the blades 1122 of the impeller 112 are generally arc-shaped, convex in a direction away from the center of the mounting portion 1123. Two circumferentially adjacent blades 1122 are spaced at a predetermined angle along the rotation direction of the impeller 112, and their lengths are approximately equal (with an error value not exceeding ±5%). In other embodiments, the blades 1122 can also be straight or any other suitable shape, and the blades 1122 can extend radially.

[0068] In other embodiments, the blades 1122 of the impeller 112 may be of non-uniform length. For example, the impeller has four pairs of blades 1122, each pair including one long blade and one short blade, with the long and short blades alternating. The wrap angle of each blade 1122 (the wrap angle is the angle between the line connecting the inner end of the blade 1122 to the center of the mounting portion 1123 and the line connecting the outer end of the blade 1122 to the center of the mounting portion 1123) is less than 90 degrees. By providing alternating long and short blades, fluid blockage at the inner end of the blades 1122 can be reduced. Furthermore, the inner end of the long blade is closer to the central axis of the impeller 112 than the inner end of the short blade. For example, the ratio T of the distance from the inner end of the short blade to the central axis of the impeller 112 to the outer diameter of the impeller 112 is 0.27 to 0.37, and the distances from the outer ends of the short and long blades to the central axis of the impeller 112 are approximately equal. The smaller the T value within the above range, the more beneficial it is to reduce the probability of vortices being generated near the leading edge of the blade 1122 near the tongue, and to reduce the shear stress in the flow channel surrounded by the long and short blades 1122 near the tongue, thereby reducing the damage to red blood cells and lowering the hemolysis index. In addition, it also improves the blood pumping efficiency of the centrifugal pump 100.

[0069] The mounting part 1123 has an annular cavity structure. The first centering structure 130 is located inside the mounting part 1123 and is connected to the circumferential sidewall of the mounting part 1123. The first magnet 1121 is located inside the mounting part 1123 and is connected to the bottom wall of the mounting part 1123 away from the blade 1122.

[0070] Thus, the impeller 112 includes a mounting portion 1123 and blades 1122. The first centering structure 130 is housed in the mounting portion 1123. The mounting portion 1123 can seal the first centering structure 130, which can separate the first centering structure 130 from the fluid in the first housing 111, thereby preventing the magnetic fluid 132 in the first centering structure 130 from overflowing and contaminating the fluid.

[0071] Please return Figure 2 , Figure 3 and Figure 4 The first housing 111 includes a protrusion 1115, which protrudes toward the side close to the second housing 121. The inner side of the protrusion 1115 forms an accommodating space for the mounting portion 1123. The second housing 121 has a groove 1213, and the protrusion 1115 is inserted into the groove 1213. The second centering structure 140 is connected to the end face of the groove 1213 away from the center of the second housing 121.

[0072] The first housing 111 includes an upper volute 1113 and a lower volute 1114. A protrusion 1115 is disposed on the lower volute 1114. The protrusion 1115 protrudes toward the side away from the upper volute 1113. A groove 1213 is provided on the cover 1211. The opening of the groove 1213 is disposed toward the lower volute 1114. The protrusion 1115 is inserted into the groove 1213 to realize the positioning of the first housing 111 and the second housing 121. The protrusion 1115 fits against the inner wall of the groove 1213. The upper volute 1113 and the lower volute 1114 together form a cavity structure. The impeller 112 is housed in the cavity structure and can rotate within it. The mounting part 1123 is located inside the protrusion 1115. The outline of the protrusion 1115 is adapted to the mounting part 1123, and the mounting part 1123 can rotate within the protrusion 1115.

[0073] The upper volute 1113 has multiple first connecting holes arranged along the circumference of the upper volute 1113. The lower volute 1114 has multiple second connecting holes corresponding to the first connecting holes. The second connecting holes are coaxial with the first connecting holes. Fasteners pass through the first connecting holes and the second connecting holes in sequence to connect the upper volute 1113 and the lower volute 1114.

[0074] Therefore, by including a protrusion 1115 in the first housing 111, the mounting part 1123 can be accommodated in the protrusion 1115. By providing a groove 1213 in the second housing 121, the protrusion 1115 is inserted into the groove 1213. On the one hand, the positioning of the first housing 111 and the second housing 121 is realized. On the other hand, the cooperation between the protrusion 1115 and the groove 1213 improves the space utilization, reduces the overall volume of the centrifugal pump 100, and improves the portability of the centrifugal pump 100.

[0075] like Figure 13 , Figure 14 As shown, the drive mechanism 122 includes a rotor 1221 and a stator 1223. The stator 1223 has an annular structure and is connected to the side wall of the base 1212. The stator 1223 includes a stator core and a winding. The winding is wound on the stator core. The rotor 1221 has an annular structure and is located inside the stator 1223. When the winding is energized, the stator 1223 generates an electromagnetic effect to generate a magnetic field. The rotor 1221 rotates under the action of the magnetic field of the stator 1223.

[0076] like Figures 13 to 15As shown, the drive device 120 also includes a mounting base 123, a first bearing 124 and a second bearing 125. The mounting base 123 is connected to the inner wall of the second housing 121. The first bearing 124 and the second bearing 125 are coaxially mounted on the mounting base 123. The rotor 1221 is inserted into the first bearing 124 and the second bearing 125, and the rotor 1221 can rotate within the first bearing 124 and the second bearing 125.

[0077] Mounting base 123 is located inside the second housing 121 and connected to the side wall of the second housing 121 away from the first housing 111. For example, mounting base 123 can be welded, bolted, or snapped to the inner wall of the second housing 121. Mounting base 123 is provided with mounting hole 1231, which is arranged along the axial direction of impeller 112, and the axis of mounting hole 1231 is on the same straight line as the axis of impeller 112. The first bearing 124 is installed in the mounting hole 1231, and the axis of the first bearing 124 is on the same straight line as the axis of the mounting hole 1231. The second bearing 125 is installed in the mounting hole 1231, and the second bearing 125 and the first bearing 124 are arranged vertically along the axis of the mounting hole 1231. A buffer shim 126 is also provided between the first bearing 124 and the second bearing 125. The buffer shim 126 is used to reduce the force transmission between the first bearing 124 and the second bearing 125. The first bearing 124 is located on the side of the second bearing 125 closer to the impeller 112.

[0078] During the operation of the drive mechanism 122, the rotor 1221 is subjected not only to axial loads (torque from the magnetic force transmitted by the first magnet 1121 and the second magnet 1222) but also to radial loads (torque generated by the stator 1223 driving the rotor 1221 to rotate). Thus, under the combined action of radial and axial loads, the rotor 1221 experiences a tilting force, and the inner and outer rings of the bearings inevitably develop a certain tilt angle, causing the rotor 1221 to... The rotor 1221 is prone to deviating from its axial direction. When this deviates, the axis of the rotor 1221 and the mounting hole 1231 will tilt, causing the end face of the rotor 1221 near the impeller 112 to also tilt. At this time, the end face of the rotor 1221 near the impeller 112 will be closer to one side and farther from the impeller 112 on the other, resulting in inconsistent magnetic forces on both sides of the impeller 112, and consequently, inconsistent torques on both sides, causing disturbances in the impeller 112. When the tilting stress generated by the rotor 1221 on the first bearing 124 is too large, the second bearing 125 will further constrain the tilting stress generated by the rotor 1221, providing a balancing force opposite to the tilting stress.

[0079] Thus, the drive mechanism 122 is mounted on the mounting base 123 within the second housing 121, allowing the mounting base 123 to constrain the vibrations generated during the operation of the drive mechanism 122. The first bearing 124 and the second bearing 125 are coaxially mounted on the mounting base 123, with the rotor 1221 inserted within them. This allows the first bearing 124 and the second bearing 125 to jointly constrain the movement of the rotor 1221 in directions deviating from the axis, thereby ensuring the stability of the rotor 1221's rotation around the axis, preventing the rotor 1221 from tilting due to deviation from the axis, and reducing the probability of causing disturbances to the impeller 112.

[0080] It is understood that in other embodiments, one or more bearings may be provided. When there is only one bearing, the bearing is installed in the mounting hole 1231, and the rotor is inserted into the bearing.

[0081] like Figure 14 , Figure 15 As shown, the drive device 120 also includes a preload member 127. The preload member 127 connects the rotor 1221 and the second bearing 125 on the side of the rotor 1221 away from the impeller 112. The preload member 127 is used to increase the axial preload of the first bearing 124 and the second bearing 125 to prevent vibrations that deviate from the axial direction during the rotation of the rotor 1221.

[0082] The preload 127 includes an elastic element 1271 and a fastener 1272. A first connecting hole is provided on the end face of the rotor 1221 away from the impeller 112, and a second connecting hole is provided on the elastic element 1271. The fastener 1272 passes through the first connecting hole and the second connecting hole to connect the rotor 1221 and the elastic element 1271. The elastic element 1271 also fits against the end face of the rotor 1221 away from the impeller 112 and the end face of the second bearing 125 away from the first bearing 124. In this way, the elastic element 1271 can constrain the second bearing 125 by connecting with the rotor 1221, and can increase the preload force between the first bearing 124 and the second bearing 125, thereby increasing the stiffness of the first bearing 124 and the second bearing 125 against axial displacement and reducing the probability of vibration deviating from the axial direction during the rotation of the rotor 1221.

[0083] It is understood that in other embodiments, the preload 127 includes a fastener and at least two rigid washers, the fastener connecting the rigid washers to the rotor 1221, and the rigid washers applying preload force to the first bearing 124 and the second bearing 125 by being connected to the rotor 1221.

[0084] like Figure 14As shown, the drive device 120 also includes a control device 128. A positioning groove 1233 is provided on the end face of the mounting base 123 away from the rotor. The control device 128 is installed in the positioning groove 1233. The control device 128 is electrically connected to the winding on the stator 1223 to control the current of the winding.

[0085] like Figure 15 As shown, the upper end face of the rotor 1221 is provided with a mounting groove 1221c. The first magnet 1121 is installed in the mounting groove 1221c, and the impeller 112 is equipped with a second magnet 1222. The first magnet 1121 and the second magnet 1222 attract each other to realize the connection between the rotor 1221 and the impeller 112. During the operation of the drive mechanism 122, the rotor 1221 rotates about the center of the stator 1223. The rotor 1221 drives the impeller 112 to rotate through the attraction between the first magnet 1121 and the second magnet 1222. The first magnet 1121 and the second magnet 1222 can be made of permanent magnet materials. For example, the permanent magnet material can be a flexible polymer bonded to NdFeB material, or it can be any one of AlNiCo permanent magnet alloys, IronChromiumCo permanent magnet alloys, permanent magnet ferrites, rare earth permanent magnet materials, or composite permanent magnet materials. This permanent magnet material can be magnetized using an open magnetic circuit magnetization method. After magnetization, the leakage magnetic field on the back of the magnetic sheet is minimized, thereby forming a magnet with unilateral polarity. For example, in one embodiment, such as... Figure 17 As shown, the magnetization process of the permanent magnet material using an open magnetic circuit magnetization method is as follows: Two permanent magnet materials to be magnetized and a U-shaped iron core 180 with a coil are provided. The permanent magnet materials to be magnetized include a first permanent magnet block 171 and a second permanent magnet block 172. The U-shaped iron core 180 includes a first magnetization end 181 and a second magnetization end 182. The first permanent magnet block 171 is placed at the first magnetization end 181, and the second permanent magnet block 172 is placed at the second magnetization end 182. When a positive current is passed through the coil of the U-shaped iron core 180, the U-shaped iron core 180 forms a counterclockwise magnetic circuit, such that the end face of the first permanent magnet block 171 is the N pole, the end face of the second permanent magnet block 172 is the S pole, and the end faces of the first permanent magnet block 171 and the second permanent magnet block 172 away from the U-shaped iron core 180 do not form magnetic poles. In this way, each of the two permanent magnet materials has only one magnetic pole, and no magnetic pole is formed at the other end of that pole, minimizing magnetic leakage on its back side. It can be understood that in this embodiment, the annular magnet 1221e on the rotor, which cooperates with the stator to achieve rotor rotation (e.g., Figure 15 (As shown) an open magnetic circuit magnetization method can also be used. In this way, the magnetic leakage on the back side of the toroidal magnet (i.e. the side away from the stator) is smaller, the magnetic efficiency between the toroidal magnet and the stator is higher, and the volume of the toroidal magnet can be reduced.

[0086] like Figure 16As shown, the first magnet 1121 includes a first polarity magnet 1121a and a second polarity magnet 1121b. The first polarity magnet 1121a and the second polarity magnet 1121b are alternately arranged along the circumference of the impeller 112. The polarities of the first polarity magnet 1121a and the second polarity magnet 1121b are opposite. For example, when the first polarity magnet 1121a is the N pole, the second polarity magnet 1121b is the S pole, and when the first polarity magnet 1121a is the S pole, the second polarity magnet 1121b is the N pole. It is understood that in this embodiment, both the first polar magnet 1121a and the second polar magnet 1121b can be magnetized by using an open magnetic circuit magnetization method. The first polar magnet 1121a forms a magnetic pole only on the axial end face near the second magnet 1122, and the second polar magnet 1121b forms a magnetic pole only on the axial end face near the second magnet 1122.

[0087] The second magnet 1222 includes a third polarity magnet 1222a and a fourth polarity magnet 1222b. The third polarity magnet 1222a and the fourth polarity magnet 1222b are alternately arranged along the circumference of the rotor 1221. The polarities of the third polarity magnet 1222a and the fourth polarity magnet 1222b are opposite. Furthermore, the polarity of the third polarity magnet 1222a is opposite to that of the first polarity magnet 1221a, and the polarity of the fourth polarity magnet 1222b is opposite to that of the first polarity magnet 1222a. The polarities of the binary magnets 1121b are opposite. For example, when the first polar magnet 1121a is the N pole and the third polar magnet 1222a is the S pole, then the fourth polar magnet 1222b is the N pole and the second polar magnet 1121b is the S pole; conversely, when the first polar magnet 1121a is the S pole and the third polar magnet 1222a is the N pole, the fourth polar magnet 1222b is the S pole and the second polar magnet 1122b is the N pole. It can be understood that in this embodiment, both the third polar magnet 1222a and the fourth polar magnet 1222b can be magnetized using an open magnetic circuit magnetization method. The third polar magnet 1222a forms a magnetic pole only on the axial end face near the first polar magnet 1121a, and the fourth polar magnet 1222b forms a magnetic pole only on the axial end face near the second polar magnet 1121b.

[0088] During the rotation of rotor 1221, each first polarity magnet 1121a at least partially covers the third polarity magnet 1222a and the fourth polarity magnet 1222b simultaneously, and each second polarity magnet 1121b at least partially covers the third polarity magnet 1222a and the fourth polarity magnet 1222b simultaneously.

[0089] During the actual operation of the drive mechanism 122, in a stationary state, the repulsive and attractive forces of the first magnet 1121 and the second magnet 1222 are aligned on a straight line, and the torque between the drive mechanism 122 and the impeller 112 is zero. However, during operation, after the rotor 1221 rotates, the impeller 112 remains stationary due to inertia, causing its rotation to lag behind that of the rotor 1221. At this point, the second magnet 1222 on the rotor 1221 begins to shift at a certain angle relative to the first magnet 1121 on the impeller 112. After the first magnet 1121 and the second magnet 1222 are misaligned, the third polarity magnet 1222a and the fourth polarity magnet 1222b alternately occupy the gap between the first polarity magnet 1121a and the second polarity magnet 1121b, providing pulling and repulsive forces respectively to drive the impeller 112 to rotate.

[0090] In this way, the torque between the rotor 1221 and the impeller 112 is transmitted through the first magnet 1121 and the second magnet 1222. Then, under the attraction of the first centering structure 130 and the second centering structure 140, the axial end faces of the first centering structure 130 and the second centering structure 140 tend to be flush, thereby reducing the misalignment of the first centering structure 130 and the second centering structure 140 and improving the magnetic efficiency.

[0091] like Figure 15 As shown, the rotor core includes a core body and a mounting platform 1221d. The mounting platform 1221d is connected to the end of the core body near the impeller 112. The mounting groove 1221c is formed on the mounting platform 1221d. There are multiple mounting grooves 1221c. The multiple mounting grooves 1221c are equidistantly spaced around the axis of the mounting hole 1231. The third polarity magnet 1222a and the fourth polarity magnet 1222b are sequentially inserted into the mounting grooves 1221c. The mounting platform 1221d has a frustum-shaped or disc-shaped structure. Multiple limiting grooves are provided on the end face of the mounting platform 1221d near the impeller 112. The multiple limiting grooves are arranged in a circular array with the axis of the mounting hole 1231 as the center. The third polarity magnet 1222a and the fourth polarity magnet 1222b are installed in the mounting groove 1221c in sequence. The positions of the first polarity magnet 1221a and the fourth polarity magnet 1222b are set to correspond to each other, and the positions of the second polarity magnet 1221b and the third polarity magnet 1222a are set to correspond to each other.

[0092] Example 2

[0093] The difference between this embodiment and Embodiment 1 is that, as Figure 18 , Figure 19As shown, the pump body device 310 has an inflow hole, and the drive device 320 has a clearance hole 3211. The clearance hole 3211 passes through the drive device 320. One end of the inflow pipe 350 is detachably connected to the pump body device 310 and communicates with the inflow hole 3111. The other end of the inflow pipe 350 passes through the clearance hole 3211 and is at least partially located outside the clearance hole 3211.

[0094] In this embodiment, the drive device 320, the pump body device 310, and the inflow pipe 350 are all independent components. A clearance hole 3211 on the drive device 320 passes through the drive device 320 and is located at the axial center of the drive device 320. That is, the clearance hole 3211 extends from one axial end of the drive device 320 to the other axial end, and the axis of the clearance hole 3211 is on the same straight line as the axis of the drive device 320. After the centrifugal pump 100 is connected to human tissue, one axial end of the drive device 320 is in contact with and fixed to the corresponding tissue surface.

[0095] The pump body assembly 310 is detachably connected to the drive unit 320. Specifically, the pump body assembly 310 can be snapped, threaded, or bolted to the drive unit 320. The inflow hole 3111 and the clearance hole 3211 are coaxially arranged, with the inflow hole 3111 located on the end face of the pump body assembly 310 closer to the drive unit 320. After the centrifugal pump 100 is connected to human tissue, the pump body assembly 310 is located on the side of the drive unit 320 away from the human tissue (i.e., the opposite side of the end face of the drive unit 320 connected to the human tissue).

[0096] One axial end of the inflow pipe 350 passes through the clearance hole 3211 and communicates with the inflow hole 3111. The other axial end of the inflow pipe 350 passes out from the clearance hole 3211 and is located outside the clearance hole 3211. After the centrifugal pump 100 is connected to human tissue, the inflow pipe 350 is inserted into human tissue and communicates with the blood vessels or heart of the human body.

[0097] During the installation of the centrifugal pump 100 into human tissue, one end of the inflow pipe 350 is first inserted into the human tissue to connect the inflow pipe 350 with the blood vessels in the human body. Then, the drive device 320 is connected to the human tissue to fix the drive device 320 onto the human tissue. At the same time, the drive device 320 is fitted onto the inflow pipe 350 through the clearance hole 3211. Then, the pump body device 310 is installed on the end face of the drive device 320 away from the human tissue, and the inflow hole 3111 is connected to the inflow pipe 350. During the replacement of the pump body device 310, the pump body device 310 is removed from the end face of the drive device 320 away from the human tissue to disassemble the pump body device 310. Then, the new pump body device 310 is connected to the drive device 320 from the end face of the drive device 320 away from the human tissue to install the pump body device 310. During the operation of the centrifugal pump 100, the drive device 320 drives the pump body device 310 to operate. The pump body device 310 generates suction and draws blood into the pump body device 310 through the inflow pipe 350. Then, the blood is pumped back into the human tissue through the inflow pipe 350.

[0098] The advantage of this arrangement is that, with an inflow hole on the pump body 310 and a clearance hole 3211 on the drive device 320, the inflow pipe 350 passes through the clearance hole 3211 and communicates with the inflow hole 3111. This allows the inflow pipe 350 to pass through the drive device 320 and communicate with the human tissue, thereby connecting the drive device 320 with the human tissue. The pump body 310 is connected to the end of the drive device 320 away from the human tissue. Compared with the prior art where the pump body 310 is located between the drive device 320 and the human tissue, the pump body 310 can be disassembled and assembled from the side away from the human tissue, eliminating the need to disassemble the drive device 320 first, reducing the damage to the human tissue and the operation time caused by the disassembly and assembly of the pump body 310.

[0099] like Figures 19 to 21 As shown, the pump body assembly 310 is located below the drive unit 320. The impeller 312 includes a mounting part 3123 and blades 3122. The mounting part 3123 is located between the blades 3122 and the drive unit 320. The blades 3122 are connected to the end face of the mounting part 3123 away from the drive unit 320. The end face of the mounting part 3123 near the drive unit 320 forms a fluid blocking surface.

[0100] It should be noted that the mounting part 3123 includes a first end face 3123a and a second end face 3123b. The first end face 3123a is the end face of the mounting part 3123 near the drive device 320. The first end face 3123a at least partially coincides with the axial projection of the inlet hole 3111. The second end face 3123b is the end face of the mounting part 3123 near the blade 3122. The blade 3122 is connected to the second end face 3123b. The end face of the mounting part 3123 near the drive device 320 constitutes a fluid blocking surface, meaning that the first end face 3123a completely covers the axial projection area of ​​the inlet hole 3111, and the second end face 3123b is a completely closed plane, which does not have any other channels for fluid flow in the area outside the axial projection of the inlet hole.

[0101] During the actual operation of the pump body device 310, the pump body device 310 is located below the drive device 320. Under the action of gravity and the centrifugal suction of the blades 3122, the fluid enters the first housing 311 from the inlet hole 3111 along the first direction f1. Then, it is blocked by the first end face 3123a and moves towards the radial second direction f2 of the mounting part 3123. Then, it moves along the circumferential sidewall of the mounting part 3123 towards the third direction f3 of the blades 3122 and flows out towards the outlet under the action of the centrifugal force generated by the blades 3122.

[0102] The advantage of this arrangement is that, with the pump body 310 located below the drive device 320 and the mounting part 3123 located between the blade 3122 and the drive device 320, the end face of the mounting part 3123 near the drive device 320 forms a fluid blocking surface. Under the action of gravity, the centrifugal force generated by the impeller 312 and the blocking surface, the fluid forms a one-sided flow channel, so that the first housing 311 has only one main channel for pumping fluid. Compared with the existing technology that forms a secondary flow channel, this can effectively reduce hemolysis and coagulation.

[0103] like Figures 19 to 21 As shown, the blade 3122 extends radially along the mounting portion 3123 to the outer side of the mounting portion 3123 to form an extension section 3122a, and a first clearance structure 3122b is provided on the side wall of the extension section 3122a near the mounting portion 3123.

[0104] The extension section 3122a refers to the radial extension of the blade 3122 along the mounting portion 3123, specifically the portion outside the mounting portion 3123. The distance x1 between the end of the extension section 3122a away from the mounting portion 3123 and the mounting portion 3123 is between 3 and 7 mm, specifically, the distance x1 is 3 mm, 4 mm, 5 mm, or 7 mm. The first clearance structure 3122b refers to the fluid flow space formed by the axially spaced end face of the extension section 3122a near the mounting portion 3123 and the second end face 3123b. Specifically, the distance x2 between the end face of the extension section 3122a near the mounting portion 3123 and the second end face 3123b is between 0.5 and 3 mm, specifically, the length of x2 can be 0.5 mm, 1 mm, 2 mm, or 3 mm.

[0105] Thus, the blade 3122 extends radially along the mounting portion 3123 to the outer side of the mounting portion 3123 to form an extension section 3122a. The extension section 3122a has a first clearance structure 3122b near the side wall of the mounting portion 3123, so that a fluid buffer space is formed between the extension section 3122a and the inner wall of the second housing 321, reducing the shear force generated by the rotation of the blade 3122 on the fluid.

[0106] Understandable, such as Figure 20 As shown, in this embodiment, the impeller 312 is a non-uniform height impeller, meaning its blades 3122 are non-uniform height blades. The height of each blade 3122 gradually decreases from its inner end to its outer end along its length, with a height difference ranging from 1mm to 8mm. For example, for an impeller rotating at approximately 5000 rpm, the equivalent deviation angle for the height difference of its blades 3122 can be set to 2° to 3°; for an impeller 312 rotating at speeds above 10000 rpm, the equivalent deviation angle for the height difference of its blades can be set to 10° to 30°. For instance, when the impeller 312 rotates at approximately 5000 rpm, the equivalent deviation angle for the height difference of each blade 3122 is 2°, the height of the inner end of the blade 3122 is 2mm, and the height of the outer end of the blade 3122 is 1.3mm. It is understood that this invention does not exclude the use of equal-height blades 3122 or straight blades. While the structure and manufacturing process of equal-height straight impellers (i.e., impellers with blades of equal height and in a straight line) are simpler and have lower production costs, the impeller in this embodiment is more efficient and has lower power loss than equal-height straight impellers. More importantly, the fluid acceleration is more stable. The equivalent deviation angle of the height difference can be calculated using the following formula: α = Arctan(h / s), where α represents the equivalent deviation angle of the height difference, h represents the height difference between the inner and outer ends of blade 3122, and s represents the radial distance between the inner and outer ends of blade 3122. The radial distance between two objects refers to the orthographic projection length of the line connecting the two objects onto the radial plane.

[0107] like Figure 19 , Figure 22 and Figure 23 As shown, the pump body device 310 includes a first housing 311, an inflow hole 3111 is formed on the first housing 311, a sealing groove 3112 is formed on the end face of the first housing 311, the inflow hole 3111 is located inside the sealing groove 3112, one axial end of the inflow pipe 350 is inserted into the sealing groove 3112, the axes of the inflow pipe 350 and the inflow hole 3111 are on the same straight line, and the inflow pipe 350 is threadedly connected to the sealing groove 3112.

[0108] Both the inlet hole 3111 and the sealing groove 3112 are opened on the end face of the first housing 311 near the second housing 321. The sealing groove 3112 is an annular groove. The inlet hole 3111 is located inside the sealing groove 3112. The axis of the inlet hole 3111 and the axis of the sealing groove 3112 are on the same straight line. The opening of the sealing groove 3112 is set towards the clearance hole 3211. One end of the inlet pipe 350 passes through the clearance hole 3211 of the drive device 320 and is inserted into the sealing groove 3112. The circumferential sidewall of the inlet pipe 350 is in contact with the sidewall of the sealing groove 3112.

[0109] In one embodiment, the outer wall of the inflow pipe 350 is provided with an external thread, and the inner wall of the sealing groove 3112 is provided with an internal thread. The external thread and the internal thread engage to achieve a threaded connection between the inflow pipe 350 and the sealing groove 3112. In another embodiment, the outer wall of the inflow pipe 350 is provided with an internal thread, and the inner wall of the sealing groove 3112 is provided with an external thread. The internal thread and the external thread engage to achieve a threaded connection between the inflow pipe 350 and the sealing groove 3112.

[0110] In this way, with the inflow hole located inside the sealing groove 3112, the inflow pipe 350 is threadedly connected to the sealing groove 3112, so that the threaded groove formed by the threaded connection between the sealing groove 3112 and the inflow pipe 350 can block the overflow of blood flow, thereby achieving the seal between the inflow pipe 350 and the first housing 311.

[0111] like Figure 19 , Figure 22 and Figure 23 As shown, the axial end face of the inflow pipe 350 is spaced apart from the bottom wall 3112a of the sealing groove 3112.

[0112] The axial end face of the inflow pipe 350 refers to the end face of the inflow pipe 350 near the impeller 312. The bottom wall 3112a of the sealing groove 3112 refers to the inner wall of the sealing groove 3112 that is opposite to the opening of the sealing groove 3112. The axial end face of the inflow pipe 350 and the bottom wall 3112a of the sealing groove 3112 are spaced apart by a distance x3. Specifically, the length of the distance x3 is between 0.5-2cm, and can be 0.5cm, 0.8cm, 1.2cm, 1.5cm or 2cm.

[0113] The advantage of this design is that by spaced apart from the axial end face of the inflow pipe 350 and the bottom wall 3112a of the sealing groove 3112, a receiving groove 3112b is formed between them. When blood seeps into the sealing groove 3112 from the gap between the inflow pipe 350 and the sealing groove 3112, the blood can be deposited in the receiving groove 3112b. After the blood is deposited, it no longer flows, thus forming a dense thrombus in the receiving groove 3112b to form a flow-blocking structure. This increases the sealing effect of the sealing groove 3112 on the inflow pipe 350 and reduces the probability of blood leakage.

[0114] like Figure 22 , Figure 23 As shown, the centrifugal pump 100 also includes a sealing ring 360, which is located in the sealing groove 3112. The sealing ring 360 is in contact with the side wall of the inflow pipe 350 and has a certain elastic force. The sealing ring 360 is spaced apart from the bottom wall 3112a of the sealing groove 3112.

[0115] It should be noted that the sealing ring 360 includes any one of a metal sealing ring, a rubber sealing ring, or a silicone sealing ring. The sealing ring 360 is located between the inner wall of the sealing groove 3112 and the side wall of the inflow pipe 350, and it fits snugly against both the inner wall of the sealing groove 3112 and the side wall of the inflow pipe 350 with a certain elastic force. A threaded groove is formed at the connection point between the inflow pipe 350 and the sealing groove 3112. There is a certain distance between the end of the threaded groove and the axial end face 3511 of the inflow pipe 350 (the end face of the inflow pipe 350 near the impeller 312). The sealing ring 360 is located between the end of the threaded groove and the axial end face 3511 of the inflow pipe 350.

[0116] The advantage of this design is that by spaced apart from the bottom wall 3112a of the sealing groove 3112, the sealing ring 360 can form a flow barrier on the side wall of the inflow pipe 350 and the sealing groove 3112, preventing blood from overflowing from the gap between the threaded grooves without deposition. This creates a dead zone for blood flow between the sealing ring 360 and the bottom wall 3112a of the sealing groove 3112, increasing the deposition rate of blood and the rate of thrombus formation in the sealing groove 3112.

[0117] like Figure 22 , Figure 23 As shown, a receiving groove 3112b is provided on the side wall of the sealing groove 3112, and the sealing ring 360 is embedded in the receiving groove 3112b. The sealing ring 360 is at least partially located on the outside of the receiving groove 3112b.

[0118] In this embodiment, the position of the receiving groove 3112b corresponds to the position of the sealing groove 3112. The receiving groove 3112b is formed on the side wall of the sealing groove 3112. The opening direction of the receiving groove 3112b is perpendicular to the opening direction of the sealing groove 3112. The outer ring of the sealing ring 360 is received in the receiving groove 3112b and fits against the inner wall of the receiving groove 3112b. The inner ring of the sealing ring 360 is located on the outside of the receiving groove 3112b. The inner ring of the sealing ring 360 fits against the side wall of the inflow pipe 350 and has a certain elastic force.

[0119] The advantage of this design is that the sealing ring 360 is embedded in the receiving groove 3112b, which is provided on the side wall of the sealing groove 3112. This allows the receiving groove 3112b to fix the sealing ring 360, thereby preventing it from being pulled out along with the inflow pipe 350 during disassembly, thus improving the convenience of disassembling and assembling the inflow pipe 350.

[0120] like Figure 23 As shown, a second clearance structure 3512 is provided at one axial end of the inflow pipe 350. The second clearance structure 3512 is located on the inner wall of the inflow pipe 350 and cooperates with the wall between the sealing groove 3112 and the inflow hole 3111.

[0121] It should be noted that the second clearance structure 3512 is formed on the inner wall of the inflow pipe 350. The second clearance structure 3512 includes a first surface 3512a and a second surface 3512b. The first surface 3512a is parallel to the wall between the sealing groove 3112 and the inflow hole 3111, and the second surface 3512b is parallel to the inner wall of the sealing groove 3112. The thickness of the first surface 3512a and the wall between the sealing groove 3112 and the inflow hole 3111 is equal. The second surface 3512b fits against the inner wall of the sealing groove 3112 to form an angle (e.g., an L-shaped structure). It can be understood that in other embodiments, the included angle between the first surface 3512a and the second surface 3512b can be set according to the inner wall structure of the sealing groove 3112. For example, in one embodiment, the inner wall of the sealing groove 3112 is inclined relative to the axial direction of the inflow hole 3111. In this case, the second surface 3512b can also be inclined relative to the axial direction of the inflow hole 3111.

[0122] The advantage of this design is that a second clearance structure 3512 is provided at one axial end of the inflow pipe 350. The second clearance structure 3512 is located on the inner wall of the inflow pipe 350. The second clearance structure 3512 cooperates with the wall between the sealing groove 3112 and the inflow hole 3111 to form an angle, so that the connection seam between the inflow pipe 350 and the sealing groove 3112 has an L-shaped structure. This allows blood to seep into the sealing groove 3112 from the connection seam under the action of gravity and the suction of the impeller 312. The blood in the sealing groove 3112 is difficult to overflow from the connection seam, which increases the deposition rate of blood in the sealing groove 3112 and the thrombus formation rate.

[0123] Please return Figure 19 The inflow pipe 350 includes a limiting protrusion 3513, and the drive device 320 includes a second housing 321. A clearance hole 3211 is opened on the second housing 321. A limiting groove 3212 is opened on the axial end face 3511 of the clearance hole 3211. The limiting protrusion 3513 is inserted into the limiting groove 3212. The limiting groove 3212 is used to stop the rotation of the inflow pipe 350 in the circumferential direction.

[0124] The inflow pipe 350 includes an inflow pipe body and a limiting protrusion 3513, which is located on the side wall of the inflow pipe body. It is understood that in some embodiments, there are multiple limiting protrusions 3513, which are arranged in a circumferential array on the side wall of the inflow pipe body.

[0125] The clearance hole 3211 is formed on the second housing 321 and passes through the second housing 321. The axis of the clearance hole 3211 is on the same straight line as the axis of the second housing 321. The axial end face 3511 of the clearance hole 3211 is the same end face as the end face of the second housing 321 away from the first housing 311. The limiting groove 3212 is formed on the inner wall of the clearance hole 3211 and passes through one axial end of the clearance hole 3211. The outline of the limiting groove 3212 corresponds to the outline of the limiting protrusion 3513.

[0126] During the installation of the centrifugal pump 100, one end of the inflow pipe 350 is connected to human tissue, and the other end of the inflow pipe 350 passes through the clearance hole 3211 and is connected to the sealing groove 3112. The limiting protrusion 3513 is inserted into the limiting groove 3212. The limiting groove 3212 can limit the movement of the limiting protrusion 3513 in the circumferential direction of the clearance hole 3211. During the disassembly of the pump body device 310, the first housing 311 is rotated in the circumferential direction along the clearance hole 3211 to realize the disassembly of the pump body device 310.

[0127] The advantage of this design is that a limiting groove 3212 is provided on the axial end face 3511 of the clearance hole 3211, and the inflow pipe 350 includes a limiting protrusion 3513, which is inserted into the limiting groove 3212. This allows the limiting groove 3212 to limit the movement of the inflow pipe 350 in the circumferential direction. In this way, during the threaded disassembly of the pump body device 310, the inflow pipe 350 will not rotate with the pump body device 310. On the one hand, this can prevent the rotation of the inflow pipe 350 from twisting the tissue. On the other hand, doctors do not need to hold the inflow pipe 350 tightly on the side closest to the human tissue to prevent the inflow pipe 350 from rotating, thereby increasing the convenience of replacing the pump body device 310 inside the body.

[0128] The centrifugal pump in the above embodiments can be implanted in the human body to assist the heart in pumping blood, or it can be used as a portable blood pump outside the body.

[0129] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0130] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A centrifugal pump, characterized in that, The device includes a pump body assembly and a drive unit, which are detachably connected. The pump body assembly includes a first housing, an impeller, and a first centering structure. The impeller is housed within the first housing, and the first centering structure is disposed on the circumferential sidewall of the impeller. The drive unit further includes a second housing and a second centering structure. The second centering structure is connected to the sidewall of the second housing and is disposed around the first centering structure. The first centering structure and the second centering structure attract each other to suspend the impeller within the first housing. The first centering structure includes a hollow volumetric structure and a magnetic fluid, wherein the volumetric structure is arranged circumferentially along the impeller and the magnetic fluid is located within the volumetric structure; The volumetric structure is a C-shaped groove structure, which is connected to the sidewall of the impeller. The second centering structure includes a C-shaped iron core, which has a first end and a second end. The first end has a first polarity, and the second end has a second polarity, with the first and second polarities being opposite. The volumetric structure includes a third end and a fourth end, which are spaced apart and connected on the side away from the second centering structure to form an annular flow channel. The opening of the C-shaped iron core is opposite to the opening of the C-shaped groove. Under the attraction of the first end, some of the magnetic fluid gathers towards the third end, and under the attraction of the second end, some of the magnetic fluid gathers towards the fourth end. The magnetic fluid in the annular flow channel can flow within the annular flow channel.

2. The centrifugal pump according to claim 1, characterized in that, The first end and the third end are flush, and the second end and the fourth end are flush.

3. The centrifugal pump according to claim 1, characterized in that, The impeller includes blades and a mounting portion. The mounting portion includes a sealed cavity structure. The blades are connected to the outer wall of the mounting portion. The first centering structure is mounted on the inner side of the mounting portion.

4. The centrifugal pump according to claim 3, characterized in that, The first housing includes a protrusion that extends toward the side of the first housing closer to the second housing, and the inner side of the protrusion forms an accommodating space for the mounting portion.

5. The centrifugal pump according to claim 4, characterized in that, The drive device further includes a second housing, on the end face of which a groove is formed, the protrusion is inserted into the groove, and the second centering structure is connected to the side wall of the groove.

6. The centrifugal pump according to claim 1, characterized in that, The driving device further includes a driving mechanism, which is installed inside the second housing. The driving mechanism includes a rotor, a mounting base, a first bearing, and a second bearing. The mounting base is connected to the inner wall of the second housing. The first bearing and the second bearing are coaxially mounted on the mounting base. The rotor is inserted into the first bearing and the second bearing.

7. The centrifugal pump according to claim 6, characterized in that, The drive unit also includes a preload element that connects the bearing and the rotor.

8. The centrifugal pump according to claim 1, characterized in that, The impeller is also provided with a first annular magnet, and the drive device is provided with a second annular magnet on the side opposite to the pump body device. The first annular magnet and the second annular magnet repel each other.

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