Blood pumping device and ventricular assist device

Abstract

The application discloses a blood pumping device and a ventricular assist device. The blood pumping device comprises a stator assembly and a rotor assembly. The stator assembly comprises a first driving structure and a first sealing surface. The stator assembly is formed with a containing cavity and a through hole. The through hole is communicated with the containing cavity and the outside. The rotor assembly is partially located in the containing cavity and extends out of the through hole at one end. The rotor assembly comprises a second sealing surface which is oppositely arranged with the first sealing surface. The first driving structure and the second driving structure are configured to interact with each other to drive the rotor assembly to move axially relative to the stator assembly, so that the second sealing surface is sealingly combined with the first sealing surface in a non-working state, and the containing cavity is relatively isolated from the outside, thereby realizing the sealing of the containing cavity. The blood pumping device can realize sealing by means of the first sealing surface and the second sealing surface of the blood pumping device itself, without the need of setting an additional sealing unit, and the use performance of the blood pumping device is improved.

Description

Technical Field

[0001] This application belongs to the field of medical device technology, and in particular relates to a blood pumping device and a ventricular assist device. Background Technology

[0002] A blood pumping device is a cardiac assist device that pumps blood from the heart into the blood vessels to provide hemodynamic support. Blood pumping devices typically consist of a stator assembly and a mover assembly. Part of the mover assembly is located within the housing cavity of the stator assembly, while another part protrudes through a through-hole formed in the stator assembly. This protrusion of the mover assembly severely compromises the sealing performance of the housing cavity. During the intervention of the blood pumping device, blood can easily enter the housing cavity of the stator assembly through the aforementioned through-hole, affecting the lifespan of the blood pumping device. Current blood pumping devices usually seal the housing cavity at the through-hole to isolate it from the outside. However, conventional sealing methods tend to increase the axial length of the blood pumping device, increasing its inflexible length, affecting the interventional effect, and also impacting the pumping efficiency, thus severely affecting the overall performance of the blood pumping device. Utility Model Content

[0003] This application provides a blood pumping device and a ventricular assist device, which can improve the performance of the blood pumping device.

[0004] In a first aspect, embodiments of this application provide a blood pumping device having a non-operating state, comprising: a stator assembly including a first driving structure and a first sealing surface, the stator assembly forming a receiving cavity and a through hole, the through hole communicating with the receiving cavity and the outside; a mover assembly, partially located within the receiving cavity, with one end extending through the through hole, the mover assembly including a second driving structure and a second sealing surface, the second sealing surface being disposed opposite to the first sealing surface; the first driving structure and the second driving structure are configured to interact to drive the mover assembly to move axially relative to the stator assembly; in the non-operating state, the second sealing surface is sealed to the first sealing surface, thereby isolating the receiving cavity from the outside.

[0005] In some embodiments, the mover assembly includes a shaft and an impeller, the shaft portion being located within the receiving cavity and one end extending through a through hole, the impeller being located outside the receiving cavity and mounted on the shaft; a first sealing surface is disposed at the end of the through hole away from the receiving cavity, and a second sealing surface is disposed on the side of the impeller facing the first sealing surface.

[0006] In some embodiments, in the non-operating state, the mover assembly forms a gap with the stator assembly at the through-hole location, and the orthogonal projection of the gap along the axial direction satisfies at least one of the following: The orthographic projection area of ​​the second sealing surface surrounds the orthographic projection area of ​​the gap; The second sealing surface is cylindrical, and the orthographic projection area of ​​the second sealing surface falls on the outer edge of the projection area of ​​the gap.

[0007] In some embodiments, the first driving structure and the second driving structure are configured to be magnetically coupled, and the centers of the first driving structure and the second driving structure are misaligned along the axial direction.

[0008] In some embodiments, the mover assembly includes a rotating shaft and a dynamic friction pair. The rotating shaft portion is located within a receiving cavity and one end extends through a through hole. The dynamic friction pair is disposed within the receiving cavity and surrounds the rotating shaft. The dynamic friction pair serves as a second driving structure.

[0009] In some embodiments, the first driving structure includes at least one electromagnet, an electromagnetic coil, and a permanent magnet.

[0010] In some embodiments, the first drive structure includes a first soft magnetic element, the mover assembly includes a permanent magnet, the permanent magnet is disposed in a receiving cavity and is arranged around the rotating shaft, and the permanent magnet serves as a second drive structure; along the axial direction, the first soft magnetic element is located on the side of the permanent magnet away from the impeller and is spaced apart from the permanent magnet, and the first soft magnetic element is used to magnetically couple with the permanent magnet and generate a magnetic attraction force along the second sealing surface pointing towards the first sealing surface.

[0011] In some embodiments, the first drive structure further includes a second soft magnetic component. Along the axial direction, the second soft magnetic component is located on the side of the permanent magnet closer to the impeller and is spaced apart from the permanent magnet. The volume of the first soft magnetic component is larger than the volume of the second soft magnetic component. The first soft magnetic component and the second soft magnetic component are configured to be able to magnetically couple with the permanent magnet together and generate a magnetic attraction force along the second sealing surface pointing towards the first sealing surface.

[0012] In some embodiments, the stator assembly includes a pump housing, the pump housing including a casing and a sealing end cover, the casing having an opening on the side facing the impeller, the sealing end cover closing the opening, a through hole penetrating the sealing end cover, and a first drive structure disposed on the side of the sealing end cover away from the impeller; the mover assembly includes a permanent magnet disposed within the stator assembly and surrounding the rotating shaft, the permanent magnet serving as at least a portion of the second drive structure.

[0013] In some embodiments, the housing serves as the first driving structure; or... The pump casing has a receiving cavity, and the first drive structure is located inside the receiving cavity.

[0014] In some embodiments, the blood pumping device also has an operating state, wherein the first sealing surface and the second sealing surface are configured to be relatively separated in the operating state.

[0015] In some embodiments, the first sealing surface and the second sealing surface are configured to form a sealing connection by abutment or snap-fit; or... The first and second sealing surfaces are configured to be sealed together by a flexible element.

[0016] In some embodiments, the stator assembly has a third sealing surface on the side facing the receiving cavity, the third sealing surface being axially disposed on the side of the through hole away from the first sealing surface; the mover assembly has a fourth sealing surface, the third sealing surface and the fourth sealing surface being opposite each other and both being disposed around the pivot shaft, the fourth sealing surface being located on the side of the third sealing surface away from the first sealing surface along the axial direction; the mover assembly is configured to be able to move axially relative to the stator assembly in response to its own rotation; the blood pumping device also has an operating state, in which the second sealing surface is relatively separated from the first sealing surface, and the fourth sealing surface is sealed to the third sealing surface, so that the receiving cavity is relatively isolated from the outside.

[0017] In some embodiments, the stator assembly includes a pump housing and a first static friction pair, and the mover assembly includes a rotating shaft, a permanent magnet, and a first dynamic friction pair. The first static friction pair, the first dynamic friction pair, and the permanent magnet are all located within a receiving cavity and arranged around the rotating shaft. Along the axial direction, the first static friction pair and the first dynamic friction pair are both located on the side of the permanent magnet closer to the through hole, and the first static friction pair is located on the side of the first dynamic friction pair away from the permanent magnet, and is sealed to the pump housing. A third sealing surface is provided on the side of the first static friction pair facing the first dynamic friction pair, and a fourth sealing surface is provided on the side of the first dynamic friction pair facing the first static friction pair.

[0018] In some embodiments, the stator assembly further includes a stator coil disposed around a permanent magnet; in the non-operating state, along the axial direction, the center of the permanent magnet is located on the side of the center of the stator coil away from the first sealing surface; in the operating state, the centers of the permanent magnet along the axial direction and the centers of the stator coil along the axial direction are aligned radially on the shaft.

[0019] Secondly, embodiments of this application provide a ventricular assist device, including the blood pumping device of any of the above.

[0020] The blood pumping device and ventricular assist device of this application embodiment have a non-operating state and include a stator assembly and a mover assembly. The stator assembly includes a first drive structure and a first sealing surface. The stator assembly forms a receiving cavity and a through hole, with the through hole connecting the receiving cavity and the outside. The mover assembly is partially located within the receiving cavity, with one end extending through the through hole. The mover assembly includes a second sealing surface, which is disposed opposite to the first sealing surface. The first drive structure and the second drive structure are configured to interact to drive the mover assembly to move axially relative to the stator assembly. In the non-operating state, the second sealing surface seals against the first sealing surface, thereby isolating the receiving cavity from the outside. The blood pumping device of this application can achieve sealing by its own first and second sealing surfaces without the need for additional sealing units. This helps to reduce the axial length of the blood pumping device, thereby reducing the inflexible length of the blood pumping device, improving the intervention effect of the blood pumping device, and also improving the blood pumping efficiency of the blood pumping device, thus improving the performance of the blood pumping device. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a cross-sectional schematic diagram of a blood pumping device provided in some embodiments of this application; Figure 2 This is a cross-sectional schematic diagram of the blood pumping device provided in some embodiments of this application in a non-operating state; Figure 3 This is another cross-sectional schematic diagram of the blood pumping device provided in some embodiments of this application; Figure 4 This is a cross-sectional schematic diagram of a blood pumping device provided in some other embodiments of this application; Figure 5 This is another cross-sectional schematic diagram of the blood pumping device provided in some other embodiments of this application; Figure 6 This is a cross-sectional schematic diagram of a blood pumping device provided in some embodiments of this application; Figure 7 yes Figure 1 A magnified view of a section at point AA; Figure 8 yes Figure 1 Another enlarged view of section AA in the middle; Figure 9 yes Figure 1 Another enlarged view of section AA in the middle; Figure 10This is a cross-sectional schematic diagram of a blood pumping device provided in some embodiments of this application.

[0023] Tag name: Blood pumping device 1000; stator assembly 100; first drive structure 110; first soft magnetic component 111; second soft magnetic component 112; first part 113; second part 114; first sub-part 1141; second sub-part 1142; receiving cavity 120; through hole 130; first sealing surface 140; first recess 141; first protrusion 142; pump housing 150; sealing end cover 151; housing 152; stator coil 160; static friction pair 170; first static friction pair 1701; second static friction pair 1702; sealing gasket 180; third sealing surface 190; Moving part assembly 200; rotating shaft 210; impeller 220; second sealing surface 221; second recess 2211; second protrusion 2212; second drive structure 230; dynamic friction pair 240; first dynamic friction pair 2401; second dynamic friction pair 2402; permanent magnet 250; fourth sealing surface 260; Avoidance zone K1; Axis X. Detailed Implementation

[0024] The features and exemplary embodiments of various aspects of this application will now be described in detail. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain this application and are not configured to limit this application. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples of this application.

[0025] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0026] In cardiac surgery, due to the patient's own illness or the needs of the surgery, the patient's heart function is weakened and the pumping capacity is insufficient. Therefore, a blood-pumping device is inserted into the heart to pump blood out of the heart and deliver it to the aorta for circulation throughout the body. The blood-pumping device includes a stator assembly and a mover assembly. A portion of the mover assembly is located within a receiving cavity of the stator assembly, and another portion extends out of the receiving cavity through a through-hole formed on the stator assembly. Exemplarily, the stator assembly may include structures such as a pump housing and a stator coil. The pump housing has a receiving cavity and a through-hole communicating with the receiving cavity, and the stator coil can be housed within the receiving cavity. The mover assembly may include structures such as a shaft and an impeller. A portion of the shaft is located within the receiving cavity, and another portion extends out of the receiving cavity to the outside of the stator assembly. The impeller is located outside the receiving cavity and is disposed on the shaft. In addition, the blood pumping device may also include an interventional catheter, which has a blood flow channel and a blood inlet and a blood outlet connecting the blood flow channel. An impeller is located at the blood outlet. By rotating the impeller, blood from the patient's heart can flow from the blood inlet into the blood flow channel and out from the blood outlet, eventually entering the blood vessel.

[0027] During the intervention of a blood pumping device, both the stator and mover assemblies enter the patient's body together. Therefore, to prevent blood from entering the stator assembly through the through-hole, the blood pumping device typically has an additional sealing unit at the through-hole to isolate the receiving cavity from the outside. However, the installation of the sealing unit usually increases the axial length of the blood pumping device. This not only increases the inflexible length of the blood pumping device, affecting the intervention effect, but also affects the blood pumping efficiency, thus seriously impacting the performance of the blood pumping device.

[0028] To address the aforementioned technical problems, this application provides a blood pumping device and a ventricular assist device. This blood pumping device can seal the gap between the rotating shaft and the stator assembly without the need for an additional sealing unit, thereby helping to reduce the axial length of the blood pumping device. This reduces the inflexible length of the blood pumping device, improves the intervention effect of the blood pumping device, and also helps to improve the blood pumping efficiency of the blood pumping device, thus enhancing the performance of the blood pumping device.

[0029] The blood pumping device provided in the embodiments of this application will now be described in conjunction with the accompanying drawings.

[0030] Please see Figure 1 and Figure 2This application provides a blood pumping device 1000, including: a stator assembly 100, including a first drive structure 110 and a first sealing surface 140, the stator assembly 100 forming a receiving cavity 120 and a through hole 130, the through hole 130 communicating with the receiving cavity 120; a mover assembly 200, partially located within the receiving cavity 120, with one end extending through the through hole 130, the mover assembly 200 including a second drive structure 230 and a second sealing surface 221, the second sealing surface 221 being disposed opposite to the first sealing surface 140; the first drive structure 110 and the second drive structure 230 being configured to interact to drive the mover assembly 200 to move relative to the stator assembly 100 along the axial direction X; in the non-operating state, the second sealing surface 221 is sealed to the first sealing surface 140, so that the receiving cavity 120 is relatively isolated from the outside.

[0031] The stator assembly 100 may be a combination of components in the blood pumping device 1000 that are always stationary. In one example, the stator assembly 100 may include a pump housing 150 and a stator coil 160 disposed within the pump housing 150. In another example, the stator assembly 100 may include a pump housing 150 without a stator coil 160 disposed within it.

[0032] A receiving cavity 120 can be formed inside the pump housing 150, and a through hole 130 can be provided on the pump housing 150, which communicates with the receiving cavity 120. The stator assembly 100 includes a first sealing surface 140, which can be formed on the outer surface of the pump housing 150 and located at the end of the through hole 130 away from the receiving cavity 120, or the first sealing surface 140 can also be formed on the inner surface of the pump housing 150 and located on the side of the through hole 130 closer to the receiving cavity 120.

[0033] The stator assembly 100 includes a first drive structure 110, which can be any magnetic structure such as an electromagnet, a permanent magnet, or a soft magnetic component made of a soft magnetic material. The first drive structure 110 can be a structure independent of other components in the stator assembly 100. Alternatively, it can be made of the aforementioned magnetic material and used as the first drive structure 110. When the first drive structure 110 is a structure independent of other components in the stator assembly 100, it can be located inside or outside the pump housing 150. Optionally, when the first drive structure 110 is a structure independent of other components in the stator assembly 100, the empty space inside the pump housing 150 can be used to arrange the first drive structure 110, thereby helping to further reduce the size of the blood pumping device 1000.

[0034] The mover assembly 200 may be a combination of components in the blood pumping device 1000 that are movable relative to the stator assembly 100. In one example, the mover assembly 200 may include a shaft 210 and structures such as an impeller 220 and a permanent magnet 250 disposed on the shaft 210. A portion of the shaft 210 may be located within the pump housing 150 of the stator assembly 100, and the permanent magnet 250, along with structures such as the stator coil 160 within the pump housing 150, drives the shaft 210 to rotate. One end of the shaft 210 may extend through the through hole 130 into the receiving cavity 120 to drive the impeller 220 to rotate. In another example, the mover assembly 200 may include the shaft 210 and the impeller 220, without the permanent magnet 250 disposed within the pump housing 150.

[0035] The impeller 220 is located outside the stator assembly 100, surrounding the portion of the rotating shaft 210 that extends out of the pump housing 150. Driven by the rotating shaft 210, the impeller 220 can rotate synchronously to pump blood. The blood pumping device 1000 can include an operating state and a non-operating state. In the operating state, the impeller 220 can rotate under the drive of the rotating shaft 210 to pump blood. In the non-operating state, the impeller 220 stops operating and remains stationary. It is understood that the non-operating state can include any stage in which the blood pumping device 1000 is not pumping blood, such as the stage in which the blood pumping catheter is inserted into the patient's body, or the stage in which the blood pumping catheter is not inserted into the patient's body.

[0036] The mover assembly 200 includes a second drive structure 230 and a second sealing surface 221. The second sealing surface 221 is disposed opposite to the first sealing surface 140. The second sealing surface 221 may be located inside or outside the receiving cavity 120. In this embodiment, axial direction X may refer to the axial direction X of the rotating shaft 210. In some implementations, the second sealing surface 221 and the first sealing surface 140 are disposed opposite to each other along the axial direction X.

[0037] The second drive structure 230 can be disposed on the rotating shaft 210 or in other structures. The second drive structure 230 can be any magnetic structure, such as an electromagnet, a permanent magnet, or a soft magnetic component made of soft magnetic material. The second drive structure 230 can be a structure of the mover assembly 200 independent of other components. Alternatively, it can utilize a structure such as a permanent magnet 250 in the mover assembly 200 as the second drive structure 230. It can also utilize a structure such as a bearing or dynamic friction pair 240 in the mover assembly 200 made of magnetic material as the second drive structure 230. The second drive structure 230 can be located inside or outside the pump housing 150 of the stator assembly 100.

[0038] The first drive structure 110 and the second drive structure 230 can interact to generate a force that can drive the mover assembly 200 to move relative to the stator assembly 100 along the axial direction X, so that the second sealing surface 221 is sealed to the first sealing surface 140 in the non-working state, thereby isolating the receiving cavity 120 from the outside. This reduces the risk of blood entering the receiving cavity 120 through the through hole 130 in the non-working state, and helps to improve the service life and reliability of the blood pumping device 1000.

[0039] The blood pumping device 1000 of this application embodiment can achieve sealing by means of its own first sealing surface 140 and second sealing surface 221 without the need to set an additional sealing unit. This helps to reduce the axial X length of the blood pumping device 1000, which can reduce the non-bendable length of the blood pumping device 1000, improve the intervention effect of the blood pumping device 1000, and also improve the blood pumping efficiency of the blood pumping device 1000, thereby improving the performance of the blood pumping device 1000.

[0040] Furthermore, compared to the blood pumping device 1000 that uses a perfusion sealing method, the blood pumping device 1000 of this application embodiment has a simple structure, is easy to manufacture, has high safety, and also helps to improve the deployment efficiency of surgery.

[0041] It should be noted that, in this embodiment, the mover assembly 200 can move axially X relative to the stator assembly 100 in a non-operating state, so that the second sealing surface 221 is sealed to the first sealing surface 140 in the non-operating state. Alternatively, the mover assembly 200 can also move axially X relative to the stator assembly 100 in an operating state, so that the second sealing surface 221 is sealed to the first sealing surface 140 in the non-operating state. In the operating state, such as Figure 1 As shown, the first sealing surface 140 and the second sealing surface 221 can be separated from each other and spaced apart along the axial direction X. Alternatively, in the working state, the first sealing surface 140 and the second sealing surface 221 can also remain in a sealed engagement state. Alternatively, in the working state, the first sealing surface 140 and the second sealing surface 221 can be separated from each other and spaced apart along the axial direction X, and other sealing elements or other sealing methods are used in the blood pumping device 1000 to isolate the receiving cavity 120 from the outside.

[0042] The force generated by the interaction between the first driving structure 110 and the second driving structure 230 can be magnetic or other types of force; this embodiment does not impose any limitations on this. Furthermore, when the force is magnetic, it can be either an attractive force or a repulsive force.

[0043] Please continue reading. Figure 1 and Figure 2In some embodiments, the mover assembly 200 includes a rotating shaft 210 and an impeller 220. The rotating shaft 210 is partially located inside the receiving cavity 120 and one end protrudes from the through hole 130. The impeller 220 is located outside the receiving cavity 120 and is mounted on the rotating shaft 210. A first sealing surface 140 is disposed at the end of the through hole 130 away from the receiving cavity 120, and a second sealing surface 221 is disposed on the side of the impeller 220 facing the first sealing surface 140. In this embodiment, the side of the through hole 130 away from the receiving cavity 120 is used as the first sealing surface 140, and the side of the impeller 220 facing the first sealing surface 140 is used as the second sealing surface 221. When the first driving structure 110 and the second driving structure 230 interact and generate force, the shaft 210 and impeller 220 of the mover assembly 200 can move along the direction of the impeller 220 pointing to the through hole 130 under the drive of the force, until the side of the impeller 220 facing the through hole 130 is combined with the side of the through hole 130 facing the impeller 220, thereby achieving a sealing combination between the second sealing surface 221 and the first sealing surface 140, thereby achieving relative isolation between the receiving cavity 120 and the outside.

[0044] In some embodiments, in the non-operating state, the mover assembly 200 forms a gap with the stator assembly 100 at the position of the through hole 130, that is, the gap between the outer peripheral surface of the mover assembly 200 and the hole surface of the through hole 130 at the through-hole position.

[0045] In some embodiments, the orthographic projection area of ​​the second sealing surface 221 along the axial X direction can surround the orthographic projection area of ​​the gap along the axial X direction. Therefore, when the first sealing surface 140 and the second sealing surface 221 are sealed together, the first sealing surface 140 and the second sealing surface 221 can seal the gap circumferentially. It should be noted that the orthographic projection area of ​​the first sealing surface 140 along the axial X direction can surround the orthographic projection area of ​​the gap along the axial X direction. In this embodiment, the orthographic projection of the structure forming the second sealing surface 221 along the axial X direction can cover the orthographic projection of the gap.

[0046] In some embodiments, the second sealing surface 221 is cylindrical, and the orthographic projection area of ​​the second sealing surface 221 along the axial direction X falls on the outer edge of the projection area of ​​the gap along the axial direction X. The orthographic projection area of ​​the structure forming the second sealing surface 221 along the axial direction X may coincide with the orthographic projection area of ​​the gap along the axial direction X. Specifically, the first sealing surface 140 may be formed on the inner wall of the through hole 130, and the second sealing surface 221 may be formed on the outer periphery of the rotating shaft 210. Both the first sealing surface 140 and the second sealing surface 221 are arranged in a ring along the circumference of the rotating shaft 210. In the circumferential direction of the rotating shaft 210, the second sealing surface 221 may protrude relative to the circumferential side surface of the rotating shaft 210. Exemplarily, the mover assembly 200 may include a sealing ring, which is annular and sleeved on the outer periphery of the rotating shaft 210. The second sealing surface 221 is formed on the outer peripheral surface of the sealing ring away from the rotating shaft 210, and the orthographic projection area of ​​the sealing ring along the axial direction X may coincide with the orthographic projection area of ​​the gap along the axial direction X.

[0047] When the first drive structure 110 and the second drive structure 230 interact to drive the actuator assembly 200 to move along the axial direction X relative to the stator assembly 100, the portion of the rotating shaft 210 with the second sealing surface 221 (e.g., the portion with the sealing ring) can move into the through hole 130, so that the second sealing surface 221 and the first sealing surface 140 are arranged opposite to each other in the circumferential direction and sealed together, thereby achieving the sealing of the gap.

[0048] In some embodiments, the first drive structure 110 and the second drive structure 230 are configured to be magnetically coupled, and the centers of the first drive structure 110 and the second drive structure 230 are misaligned along the axial direction.

[0049] Specifically, in the axial direction X, the first drive structure 110 may protrude from one end of the second drive structure 230, and the other end of the second drive structure 230 may protrude from the first drive structure 110, thereby causing the center of the first drive structure 110 along the axial direction and the center of the second drive structure 230 along the axial direction X to be misaligned. When the first drive structure 110 and the second drive structure 230 with their centers misaligned interact, they can generate a resultant force along the axial direction X, thereby driving the mover assembly 200 to move relative to the stator assembly 100 along the axial direction X through this resultant force.

[0050] Please continue reading. Figure 1 and Figure 2 In some embodiments, the mover assembly 200 includes a rotating shaft 210 and a dynamic friction pair 240. The rotating shaft 210 is partially located in the receiving cavity 120 and one end protrudes from the through hole 130. The dynamic friction pair 240 is disposed in the receiving cavity 120 and surrounds the rotating shaft 210. The dynamic friction pair 240 serves as a second drive structure 230.

[0051] Specifically, the mover assembly 200 may include a dynamic friction pair 240, which is disposed around the rotating shaft 210 and is capable of rotating relative to the stator assembly 100 along with the rotating shaft 210. Optionally, the stator assembly 100 may include a static friction pair 170, both the dynamic friction pair 240 and the static friction pair 170 being disposed around the rotating shaft 210, and the dynamic friction pair 240 and the static friction pair 170 being disposed opposite to each other. In some examples, such as Figure 3 As shown, the blood pumping device 1000 may be provided with one or more pairs of dynamic friction pairs 240 and static friction pairs 170.

[0052] The dynamic friction pair 240 serves as the second drive structure 230, meaning that at least a portion of the dynamic friction pair 240 is made of magnetic material. This at least portion of the dynamic friction pair 240 can both support the rotating shaft 210 and reduce sliding friction in the blood pumping device 1000, and also interact with the first drive structure 110 to generate a magnetic force for driving the actuator assembly 200 to move along the axial X direction when not in operation. This helps to simplify the structure of the blood pumping device 1000, further reduce the axial X length of the blood pumping device 1000, and thus further improve the performance of the blood pumping device 1000.

[0053] In some embodiments, the first drive structure 110 and the dynamic friction pair 240 are at least partially misaligned along the axial direction X. At least a portion of the first drive structure 110 protrudes along the axial direction X from the side of the dynamic friction pair 240 away from the first sealing surface 140, and at least a portion of the dynamic friction pair 240 protrudes along the axial direction X from the side of the first drive structure 110 close to the first sealing surface 140. Therefore, the portion of the first drive structure 110 protruding from the dynamic friction pair 240 can magnetically couple with the second drive structure 230 of the dynamic friction pair 240, generating a magnetic force. The direction of this magnetic force is along the second sealing surface 221 towards the first sealing surface 140. In the non-operating state, this magnetic force can cause the second sealing surface 221 of the impeller 220 to adhere to the first sealing surface 140 of the stator assembly 100, achieving a sealed connection between the second sealing surface 221 and the first sealing surface 140.

[0054] Please continue reading. Figure 3 Optionally, the mover assembly 200 also includes a permanent magnet 250, which is disposed in the receiving cavity 120 and surrounds the rotating shaft 210. Along the axial direction X of the rotating shaft 210, dynamic friction pairs 240 can be provided on opposite sides of the permanent magnet 250.

[0055] Please continue reading. Figure 3Optionally, there may be two first drive structures 110. The two first drive structures 110 are located on both sides of the permanent magnet 250 along the axial direction X. The two first drive structures 110 are respectively configured to cooperate with the dynamic friction pairs 240 on both sides of the permanent magnet 250. Both first drive structures 110 can magnetically couple with the corresponding dynamic friction pairs 240 and generate magnetic force so that the second sealing surface 221 of the impeller 220 is attached to the first sealing surface 140 of the stator assembly 100 in the non-working state.

[0056] In some embodiments, the first drive structure 110 includes at least one of an electromagnet, an electromagnetic coil, and a permanent magnet, which helps to improve the stability of the magnetic coupling between the first drive structure 110 and the second drive structure 230.

[0057] Optionally, the first driving structure 110 includes an electromagnet that can magnetically couple with the second driving structure 230 when energized and not interact with the second driving structure 230 when de-energized. For example, the first driving structure 110 can be energized in the non-working state and de-energized in the working state, so as to flexibly control the interaction between the first driving structure 110 and the second driving structure 230.

[0058] Furthermore, when the first drive structure 110 includes an electromagnet, the magnitude of the magnetic force generated when it is magnetically coupled with the second drive structure 230 can be adjusted by controlling the magnitude of the current flowing through it, thereby achieving flexible control over the moving distance and speed of the mover assembly 200.

[0059] Optionally, the blood pumping device 1000 may also include a controller that is electrically connected to the first drive structure 110 and is used to control the current on / off and the magnitude of the magnetic force of the first drive structure 110.

[0060] Please see Figure 4 In some embodiments, the first drive structure 110 includes a first soft magnetic element 111, and the mover assembly 200 also includes a permanent magnet 250. The permanent magnet 250 is disposed in the receiving cavity 120 and is arranged around the rotating shaft 210. The permanent magnet 250 serves as the second drive structure 230. Along the axial direction X, the first soft magnetic element 111 is located on the side of the permanent magnet 250 away from the impeller 220 and is spaced apart from the permanent magnet 250. The first soft magnetic element 111 is used to magnetically couple with the permanent magnet 250 and generate a magnetic attraction force along the second sealing surface 221 pointing to the first sealing surface 140.

[0061] The first soft magnetic component 111 includes a soft magnetic material, which can be selected from materials such as silicon steel sheets, nickel-iron alloys, and iron-aluminum magnetic alloys.

[0062] Specifically, in this embodiment, the permanent magnet 250 is used as the second driving structure 230. The first soft magnetic component 111 is disposed on one side of the permanent magnet 250 along the axial direction X. The first soft magnetic component 111 can generate a magnetic coupling effect with the permanent magnet 250 and form a magnetic force along the second sealing surface 221 pointing to the first sealing surface 140. This magnetic force can cause the permanent magnet 250, the rotating shaft 210 and the impeller 220 to move together along the direction from the second sealing surface 221 to the first sealing surface 140 when not in operation, thereby causing the second sealing surface 221 to fit against the first sealing surface 140 of the stator assembly 100, and realizing the sealing combination of the second sealing surface 221 and the first sealing surface 140.

[0063] In this embodiment, a permanent magnet 250 is magnetically coupled with a first soft magnetic component 111 to generate magnetic force. The permanent magnet 250 can interact with the energized stator coil 160 to drive the rotating shaft 210 to rotate, and can also interact with the first soft magnetic component 111 to generate magnetic force to drive the mover assembly 200 to move along the axial X direction. This helps to simplify the structure of the blood pumping device 1000, further reduce the axial X length of the blood pumping device 1000, and further improve the performance of the blood pumping device 1000.

[0064] Please see Figure 5 In some embodiments, the first drive structure 110 further includes a second soft magnetic element 112 along the axial direction X. The second soft magnetic element 112 is located on the side of the permanent magnet 250 near the impeller 220 and is spaced apart from the permanent magnet 250. The volume of the first soft magnetic element 111 is larger than the volume of the second soft magnetic element 112. The first soft magnetic element 111 and the second soft magnetic element 112 are configured to be able to magnetically couple with the permanent magnet 250 together and generate a magnetic attraction force along the second sealing surface 221 pointing to the first sealing surface 140.

[0065] The second soft magnetic component 112 may be the same as or different from the first soft magnetic component 111. The second soft magnetic component 112 may include soft magnetic materials, such as silicon steel sheets, nickel-iron alloys, and iron-aluminum magnetic alloys.

[0066] The second soft magnetic component 112 can magnetically couple with the permanent magnet 250 and generate a magnetic force. The directions of the magnetic force generated by the second soft magnetic component 112 and the permanent magnet 250, as well as the magnetic force generated by the first soft magnetic component 111 and the permanent magnet 250, can be the same or different. Along the axial direction X, the first soft magnetic component 111 and the second soft magnetic component 112 are located on opposite sides of the permanent magnet 250, and they magnetically couple with the permanent magnet 250 on opposite sides of the permanent magnet 250.

[0067] The volume of the first soft magnetic component 111 is larger than that of the second soft magnetic component 112, so that the resultant force of the magnetic force generated by the first soft magnetic component 111 and the permanent magnet 250 and the magnetic force generated by the second soft magnetic component 112 and the permanent magnet 250 can be directed along the second sealing surface 221 toward the first sealing surface 140. This resultant force can drive the permanent magnet 250, the rotating shaft 210 and the impeller 220 to move together along the direction from the second sealing surface 221 to the first sealing surface 140 when not in operation, so as to achieve a sealed connection between the second sealing surface 221 and the first sealing surface 140.

[0068] In some alternative embodiments, along the axial direction X, the first soft magnetic element 111 may be disposed on the side of the permanent magnet 250 near the impeller 220, while the second soft magnetic element 112 may be disposed on the side of the permanent magnet 250 away from the impeller 220.

[0069] Please see Figure 6 In some embodiments, the stator assembly 100 includes a pump housing 150, which includes a housing 152 and a sealing end cap 151. The housing 152 has an opening on the side facing the impeller 220, and the sealing end cap 151 covers the opening. A through hole 130 passes through the sealing end cap 151. A first drive structure 110 is disposed on the side of the sealing end cap 151 away from the impeller 220. The mover assembly 200 includes a permanent magnet 250, which is disposed in a receiving cavity 120 and surrounds the rotating shaft 210. The permanent magnet 250 serves as a second drive structure 230.

[0070] In this embodiment, the permanent magnet 250 serves as the second drive structure 230, which is magnetically coupled with the first drive structure 110 to generate magnetic force. The permanent magnet 250 can interact with the energized stator coil 160 to drive the rotating shaft 210 to rotate, and can also interact with the first drive structure 110 to generate magnetic force to drive the mover assembly 200 to move along the axial X direction. This helps to simplify the structure of the blood pumping device 1000, further reduce the axial X length of the blood pumping device 1000, and further improve the performance of the blood pumping device 1000.

[0071] In some embodiments, the housing 152 serves as the first drive structure 110. That is, the pump housing 150 may be composed of two parts: a sealing end cap 151 and the first drive structure 110. In this case, the first drive structure 110 is connected to the sealing end cap 151, and the two together enclose the receiving cavity 120.

[0072] In this embodiment, the housing 152 is made of magnetic material and serves as the first driving structure 110. Simultaneously, the permanent magnet 250 within the receiving cavity 120 serves as at least part of the second driving structure 230. Magnetic coupling between the housing 152 and the permanent magnet 250 generates magnetic force. This allows the housing 152 to protect the stator coil 160, rotating shaft 210, and permanent magnet 250 within the receiving cavity 120, while also driving the mover assembly 200 to move along the axial direction X. Simultaneously, the permanent magnet 250 interacts with the stator coil 160 to drive the rotating shaft 210 to rotate, and also interacts with the housing to generate magnetic force to drive the mover assembly 200 to move along the axial direction X. This helps to further simplify the structure of the blood pumping device 1000, further reduce the axial length of the blood pumping device 1000, and further improve the performance of the blood pumping device 1000.

[0073] In other embodiments, the pump housing 150 is formed with a receiving cavity 120, and the first drive structure 110 is disposed in the receiving cavity 120. Therefore, the pump housing 150 can protect the first drive structure 110, which helps to improve the service life and stability of the first drive structure 110.

[0074] Optionally, the sealing end cap 151 may include a non-magnetic material to avoid affecting the magnetic coupling between the first drive structure 110 and the permanent magnet 250.

[0075] Please see Figure 6 In some embodiments, the housing 152 includes a first portion 113 and a second portion 114, the first portion 113 being connected between the sealing end cap 151 and the second portion 114 along the axial direction X, and at least a portion of the second portion 114 protruding from the side of the permanent magnet 250 away from the first sealing surface 140, the second portion 114 serving as at least a portion of the first drive structure 110.

[0076] Optionally, the first part 113 is used as part of the first drive structure 110, and the second part 114 is used as another part of the first drive structure 110, and the volume of the second part 114 is larger than the volume of the first part 113.

[0077] At least a portion of the first part 113 and the second part 114 may be arranged around the stator coil 160. One end of the first part 113 may be connected to the sealing end cover 151 along the circumference of the sealing end cover 151, and the other end may be connected to the second part 114. Optionally, the receiving cavity 120 may be formed by the sealing end cover 151, the first part 113 and the second part 114 together.

[0078] In this embodiment, the housing 152 includes a first part 113 and a second part 114. The first part 113 is connected between the sealing end cap 151 and the second part 114. Both the first part 113 and the second part 114 can magnetically couple with the permanent magnet 250 and generate magnetic force. At least a portion of the second part 114 protrudes from the permanent magnet 250 along the axial direction X, and the volume of the second part 114 is larger than the volume of the first part 113. Therefore, the resultant force of the magnetic force generated by the magnetic coupling between the second part 114 and the permanent magnet 250 and the magnetic force generated by the magnetic coupling between the first part 113 and the permanent magnet 250 can point along the second sealing surface 221 toward the first sealing surface 140. Thus, in the non-working state, the permanent magnet 250, the rotating shaft 210, and the impeller 220 are driven to move together along the direction from the second sealing surface 221 toward the first sealing surface 140, thereby achieving a sealed connection between the second sealing surface 221 and the first sealing surface 140.

[0079] Please see Figure 6 In some embodiments, the second portion 114 includes a first sub-portion 1141 and a second sub-portion 1142 disposed circumferentially around the first sub-portion 1141. One end of the second sub-portion 1142 away from the first sub-portion 1141 is connected to the first portion 113. Along the axial direction X, the first sub-portion 1141 is disposed at a distance from the sealing end cap 151.

[0080] The first sub-part 1141 and the sealing end cap 151 are arranged at intervals relative to each other along the axial direction X, and can be located on both sides of the permanent magnet 250 along the axial direction X. The second sub-part 1142 is arranged around the first sub-part 1141 in the circumferential direction, with one end connected to the first part 113 and the other end connected to the second sub-part 1142. The receiving cavity 120 can be formed by the sealing end cap 151, the first part 113, the first sub-part 1141 and the second sub-part 1142.

[0081] In this embodiment, the second part 114 is composed of a first sub-part 1141 and a second sub-part 1142 arranged circumferentially around the first sub-part 1141, thereby making the volume of the second part 114 larger than the volume of the first part 113. The first sub-part 1141 can magnetically couple with the permanent magnet 250 and generate magnetic force on the side of the permanent magnet 250 away from the sealing end cap 151 along the axial direction X, while the second sub-part 1142 can magnetically couple with the permanent magnet 250 on its periphery and generate magnetic force. These two magnetic forces can jointly drive the actuator assembly 200 to move along the direction from the second sealing surface 221 towards the first sealing surface 140 when not in operation.

[0082] Please see Figures 1-6In some embodiments, the receiving cavity 120 is provided with a clearance area K1 along the axial direction X. The clearance area K1 is disposed opposite to the second drive structure 230. The clearance area K1 is used to accommodate at least a portion of the rotating shaft 210 and / or the second drive structure 230 when the second sealing surface 221 is sealed and connected to the first sealing surface 140.

[0083] It is known that, as Figure 1 As shown, when the second sealing surface 221 separates from the first sealing surface 140, it is spaced a certain distance from the first sealing surface 140 along the axial direction X, and the avoidance area K1 can be located on the side of the second drive structure 230 away from the first sealing surface 140 along the axial direction X.

[0084] like Figure 2 As shown, in the non-working state, the mover assembly 200 moves along the direction from the second sealing surface 221 to the first sealing surface 140 under the magnetic force generated by the magnetic coupling between the first drive structure 110 and the second drive structure 230, so that the second sealing surface 221 fits against the first sealing surface 140 to achieve a sealed connection between the two. During this process, the avoidance area K1 of this embodiment can be used to avoid the second drive structure 230 and / or the rotating shaft 210 moving along the direction from the second sealing surface 221 to the first sealing surface 140, thereby reducing the risk of mutual interference between the mover assembly 200 and the stator assembly 100.

[0085] The number of clearance areas K1 can be adapted to the number of second drive structures 230. In one example, when the permanent magnet 250 is provided with second drive structures 230 on both sides along the axial direction X, the number of clearance areas K1 can be two. The two clearance areas K1 can be located on both sides of the permanent magnet 250 along the axial direction X, and when the first sealing surface 140 and the second sealing surface 221 are separated, the two clearance areas K1 can be located on the side of the corresponding second drive structure 230 away from the first sealing surface 140 along the axial direction X. Thus, during the movement of the mover assembly 200 along the direction from the second sealing surface 221 to the first sealing surface 140, the two clearance areas K1 can be used to avoid the corresponding second drive structure 230 and / or the rotating shaft 210.

[0086] Optionally, when the second sealing surface 221 separates from the first sealing surface 140, the clearance area K1 along the axial direction X can be greater than the distance between the first sealing surface 140 and the second sealing surface 221, so that the rotating shaft 210 and the second drive structure 230 have sufficient moving space.

[0087] In some embodiments, the blood pumping device 1000 also has an operating state, wherein the first sealing surface 140 and the second sealing surface 221 are configured to be separated in the operating state.

[0088] Specifically, in the working state, the impeller 220 rotates under the drive of the rotating shaft 210 to realize the pumping of blood. During the blood pumping process, the force of the blood on the impeller 220 can cause the moving part assembly 200 to move in the direction from the first sealing surface 140 to the second sealing surface 221, thereby realizing the separation of the first sealing surface 140 and the second sealing surface 221, which helps to reduce the friction between the first sealing surface 140 and the second sealing surface 221.

[0089] In some embodiments, the first sealing surface 140 and the second sealing surface 221 are configured to form a sealing connection by abutment or snap-fit.

[0090] Please see Figure 7 In some embodiments, the first sealing surface 140 and the second sealing surface 221 are planar, which helps to reduce the manufacturing difficulty of the first sealing surface 140 and the second sealing surface 221.

[0091] In some other embodiments, the first sealing surface 140 and the second sealing surface 221 are irregularly shaped surfaces. The first sealing surface 140 and the second sealing surface 221 can be irregularly shaped surfaces that can interlock and fit tightly together. By setting the first sealing surface 140 and the second sealing surface 221 to irregularly shaped surfaces, this embodiment of the application helps to increase the contact area between the first sealing surface 140 and the second sealing surface 221, increasing the sealing path between them, thereby improving the sealing effect on the through hole 130. Furthermore, since the first sealing surface 140 and the second sealing surface 221 can be separated during operation, the impeller 220 will not be affected by the interlocking of the irregularly shaped first sealing surface 140 and the second sealing surface 221.

[0092] Please see Figure 8 In some embodiments, the first sealing surface 140 and the second sealing surface 221 are irregularly shaped surfaces; wherein, the first sealing surface 140 is provided with a plurality of first recesses 141 and a plurality of first protrusions 142, and each first recess 141 and each first protrusion 142 is evenly distributed along the circumference of the rotating shaft 210; the second sealing surface 221 is provided with a plurality of second recesses 2211 and a plurality of second protrusions 2212, and each second recess 2211 and each second protrusion 2212 is evenly distributed along the circumference. In the non-working state, each first protrusion 142 is fitted into each second recess 2211 one by one, and each second protrusion 2212 is fitted into each first recess 141 one by one.

[0093] Specifically, the first recesses 141 and the first protrusions 142 of the first sealing surface 140, as well as the second recesses 2211 and the second protrusions 2212 of the second sealing surface 221, are all evenly distributed along the circumference of the rotating shaft 210. Therefore, in the non-working state, it can be ensured that each first protrusion 142 is fitted into each second recess 2211 one by one, and each second protrusion 2212 is fitted into each first recess 141 one by one, thereby reducing the risk of the arrangement of the second recesses 2211 and the second protrusions 2212 affecting the rotational balance of the impeller 220.

[0094] In some embodiments, the first sealing surface 140 and the second sealing surface 221 are configured to be sealed together by a flexible element.

[0095] Please see Figure 9 In some embodiments, the blood pumping device 1000 further includes a sealing gasket 180 connected to one of a first sealing surface 140 and a second sealing surface 221, the second sealing surface 221 being configured to be sealed to the first sealing surface 140 via the sealing gasket 180.

[0096] The sealing gasket 180 may include flexible materials such as silicone or rubber. The sealing gasket 180 may be connected to either the first sealing surface 140 or the second sealing surface 221. When the first sealing surface 140 and the second sealing surface 221 are separated, the distance between the first sealing surface 140 and the second sealing surface 221 may be greater than the thickness of the sealing gasket 180.

[0097] In the non-operating state, when the mover assembly 200 moves along the direction from the second sealing surface 221 to the first sealing surface 140 under the action of magnetic force, so that the distance between the first sealing surface 140 and the second sealing surface 221 is less than or equal to the thickness of the sealing gasket 180, the sealing gasket 180 is pressed between the second sealing surface 221 and the first sealing surface 140, thereby achieving a sealed connection between the second sealing surface 221 and the first sealing surface 140 by means of the sealing gasket 180, which helps to improve the sealing reliability between the second sealing surface 221 and the first sealing surface 140.

[0098] Please see Figure 3 and Figure 10In some embodiments, the stator assembly 100 has a third sealing surface 190 on the side facing the receiving cavity 120, and the third sealing surface 190 is disposed along the axial direction X on the side of the through hole 130 away from the first sealing surface 140; the mover assembly 200 has a fourth sealing surface 260, the third sealing surface 190 and the fourth sealing surface 260 are opposite to each other and are both disposed around the rotating shaft 210, and along the axial direction X, the fourth sealing surface 260 is located on the side of the third sealing surface 190 away from the first sealing surface 140; the mover assembly 200 is configured to be able to move relative to the stator assembly 100 along the axial direction X in response to its own rotation; the blood pumping device 1000 also has an operating state, in which the second sealing surface 221 is relatively separated from the first sealing surface 140, and the fourth sealing surface 260 is sealed to the third sealing surface 190, so that the receiving cavity 120 is relatively isolated from the outside.

[0099] The third sealing surface 190 may be a portion of the inner surface of the stator assembly 100 facing the receiving cavity 120. The first sealing surface 140 and the third sealing surface 190 are respectively located at the two end faces of the through hole 130 along the axial direction X. Alternatively, the third sealing surface 190 may be the surface of other components in the stator assembly 100, which is not limited in this embodiment. The fourth sealing surface 260 is located inside the receiving cavity 120, and it may be the surface of any component of the mover assembly 200 located inside the receiving cavity 120. For example, the fourth sealing surface 260 may be a portion of the surface of the dynamic friction pair 240 of the mover assembly 200.

[0100] The third sealing surface 190 and the fourth sealing surface 260 are disposed opposite to each other, wherein the fourth sealing surface 260 is located on the side of the third sealing surface 190 away from the first sealing surface 140 along the axial direction X. In the non-operating state, such as... Figure 10 As shown, the second sealing surface 221 is sealed to the first sealing surface 140, while the fourth sealing surface 260 and the third sealing surface 190 are relatively separable and spaced apart along the axial direction X. In operation, the impeller 220 rotates to pump blood. During blood pumping, the force exerted by the blood on the impeller 220 causes the mover assembly 200 to move along the direction from the first sealing surface 140 to the second sealing surface 221. Figure 3 As shown, the second sealing surface 221 is separated from the first sealing surface 140, and at the same time, the fourth sealing surface 260 of the moving part assembly 200 is movable to engage with the third sealing surface 190, so that the receiving cavity 120 is relatively isolated from the outside.

[0101] It is understood that the third sealing surface 190 and the fourth sealing surface 260 are located within the receiving cavity 120, thus reducing the impact of their engagement on the rotation of the impeller 220 during operation. During operation, the mover assembly 200 forms a gap with the stator assembly 100 at the through-hole 130. Along the axial direction X, the orthographic projection area of ​​the third sealing surface 190 can cover the orthographic projection area of ​​the gap. Alternatively, along the axial direction, the orthographic projection area of ​​the third sealing surface 190 can surround the orthographic projection area of ​​the gap.

[0102] It should be noted that, in the working state, the first driving structure 110 and the second driving structure 230 may or may not have a magnetic coupling effect, and this embodiment does not limit this.

[0103] In one example, the first drive structure 110 and the second drive structure 230 can be magnetically coupled in the working state and generate a magnetic force pointing from the first sealing surface 140 to the second sealing surface 221. This magnetic force, together with the force of blood on the impeller 220, can drive the actuator assembly 200 to move in the direction from the first sealing surface 140 to the second sealing surface 221, thereby achieving a sealed connection between the fourth sealing surface 260 and the third sealing surface 190.

[0104] In another example, the first drive structure 110 and the second drive structure 230 can be magnetically coupled in the working state and generate a magnetic force pointing from the second sealing surface 221 to the first sealing surface 140. This magnetic force can be less than the force exerted by blood on the impeller 220, so that the resultant force of the force and the magnetic force can point from the first sealing surface 140 to the second sealing surface 221. The mover assembly 200 can move in the direction from the first sealing surface 140 to the second sealing surface 221 under the action of this resultant force.

[0105] The blood pumping device 1000 provided in this application embodiment can achieve static sealing in the non-working state through the sealing connection between the first sealing surface 140 of the stator assembly 100 and the second sealing surface 221 of the mover assembly 200, and achieve dynamic sealing in the working state through the sealing connection between the third sealing surface 190 of the stator assembly 100 and the fourth sealing surface 260 of the mover assembly 200. No additional sealing unit is required in either the working or non-working state, which helps to further reduce the axial X length of the blood pumping device 1000 and further improve the performance of the blood pumping device 1000.

[0106] In one example, the stator assembly 100 may include a sealing end cap 151, a through hole 130 formed in the sealing end cap 151, a first sealing surface 140 which may be the outer surface of the sealing end cap 151 facing away from the receiving cavity 120, and a third sealing surface 190 which may be the inner surface of the sealing end cap 151 facing the receiving cavity 120.

[0107] like Figure 3 and Figure 10 As shown, in some other embodiments, the stator assembly 100 includes a pump housing 150 and a first static friction pair 1701, and the mover assembly 200 includes a rotating shaft 210, a permanent magnet 250, and a first dynamic friction pair 2401. The first static friction pair 1701, the first dynamic friction pair 2401, and the permanent magnet 250 are all located within the receiving cavity 120 and arranged around the rotating shaft 210. Along the axial direction X, the first static friction pair 1701 and the first dynamic friction pair 2401 are both located on the side of the permanent magnet 250 near the through hole 130, and the first static friction pair 1701 is located on the side of the first dynamic friction pair 2401 away from the permanent magnet 250, and is sealed to the pump housing 150. A third sealing surface 190 is provided on the side of the first static friction pair 1701 facing the first dynamic friction pair 2401, and a fourth sealing surface 260 is provided on the side of the first dynamic friction pair 2401 facing the first static friction pair 1701.

[0108] The blood pumping device 1000 may be provided with multiple pairs of dynamic friction pairs 240 and static friction pairs 170. The multiple pairs of dynamic friction pairs 240 and static friction pairs 170 may include a first dynamic friction pair 2401 and a first static friction pair 1701 located along the axial direction X between the through hole 130 and the permanent magnet 250.

[0109] The pump casing 150 may include a sealing end cap 151, which is located between the first static friction pair 1701 and the impeller 220 along the axial direction X. Optionally, the side surface of the sealing end cap 151 facing the first static friction pair 1701 and the side surface of the first static friction pair 1701 facing the sealing end cap 151 may be circumferentially sealed together along the shaft 210 to prevent the through hole 130 from forming a leakage path by communicating with the gap between the sealing end cap 151 and the first static friction pair 1701. The through hole 130 may be formed jointly by the sealing end cap 151 and the first static friction pair 1701. The first sealing surface 140 may be the outer surface of the sealing end cap 151 facing away from the receiving cavity 120, and the third sealing surface 190 may be the side surface of the first static friction pair 1701 away from the sealing end cap 151 along the axial direction X.

[0110] In this embodiment, a third sealing surface 190 is formed on the first static friction pair 1701 of the stator assembly 100, and a fourth sealing surface 260 is formed on the first dynamic friction pair 2401 of the mover assembly 200. The first static friction pair 1701 and the first dynamic friction pair 2401 can not only support the rotating shaft 210 and reduce sliding friction, but also achieve dynamic sealing of the blood pumping device 1000 in the working state, which helps to simplify the structure of the blood pumping device 1000.

[0111] In one example, the first dynamic friction pair 2401 serves as the second drive structure 230, which interacts with the first drive structure 110 to generate a magnetic force for driving the actuator assembly 200 to move along the axial X direction in a non-operating state, thereby simplifying the structure of the blood pumping device 1000.

[0112] like Figure 3 and Figure 10 As shown, in some embodiments, the multiple pairs of dynamic friction pairs 240 and static friction pairs 170 further include a second dynamic friction pair 2402 and a second static friction pair 1702. The second static friction pair 1702 and the second dynamic sealing pair are both located in the receiving cavity 120 and arranged around the rotating shaft 210. Along the axial direction X, the second static friction pair 1702 and the second dynamic sealing pair are both located on the side of the permanent magnet 250 away from the impeller 220.

[0113] The second static friction pair 1702 may be located along the axial direction X between the permanent magnet 250 and the second dynamic friction pair 2402. Optionally, the second dynamic friction pair 2402 may be used as a second drive structure 230 to interact with the first drive structure 110 to generate a magnetic force for driving the actuator assembly 200 to move along the axial direction X in a non-operating state.

[0114] Optionally, at least one of the first dynamic friction pair 2401, the first static friction pair 1701, the second dynamic friction pair 2402, and the second static friction pair 1702 may be made of a material with high hardness, high wear resistance, and smoothness. For example, materials such as ceramics, quartz, and metal may be used to make at least one of the first dynamic friction pair 2401, the first static friction pair 1701, the second dynamic friction pair 2402, and the second static friction pair 1702.

[0115] like Figure 3 and Figure 10 As shown, in some embodiments, the stator assembly 100 further includes a stator coil 160, which is disposed around the permanent magnet 250; in the non-operating state, along the axial direction X, the center S1 of the permanent magnet 250 is located on the side away from the center S2 of the stator coil 160 away from the first sealing surface 140; in the operating state, the centers of the permanent magnet 250 along the axial direction X and the centers of the stator coil 160 along the axial direction X are aligned radially on the shaft 210.

[0116] It is known that in the non-working state, the center of the permanent magnet 250 along the axial X is offset relative to the center of the stator coil 160 along the axial X. Specifically, the center of the permanent magnet 250 along the axial X is offset away from the center of the stator coil 160 along the axial X to the side away from the first sealing surface 140. Therefore, when the stator coil 160 is energized to switch the blood pumping device 1000 to the working state, the stator coil 160 can generate a magnetic force along the axial X of the permanent magnet 250. This magnetic force, together with the force of blood on the impeller 220, drives the permanent magnet 250, the rotating shaft 210, the dynamic friction pair 240, and the impeller 220 to move, causing the first sealing surface 140 to separate from the second sealing surface 221, and the fourth sealing surface 260 to seal with the third sealing surface 190. This helps to reduce the difficulty of the blood pumping device 1000 from static sealing to dynamic sealing.

[0117] Furthermore, in this embodiment, by aligning the center of the permanent magnet 250 along the axial direction X with the center of the stator coil 160 along the axial direction X in the working state, it helps to improve the working effect of the permanent magnet 250 and the stator coil 160, enhance their driving effect on the rotating shaft 210 and the impeller 220, and further improve the performance of the blood pumping device 1000.

[0118] Secondly, embodiments of this application provide a ventricular assist device, including the blood pumping device 1000 of any of the above.

[0119] The above description is merely a specific implementation of this application. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, modules, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the protection scope of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the protection scope of this application.

Claims

1. A blood pumping device, having a non-operating state, characterized in that, include: A stator assembly includes a first drive structure and a first sealing surface, the stator assembly having a receiving cavity and a through hole, the through hole communicating the receiving cavity with the outside; The moving part is located within the receiving cavity and one end protrudes from the through hole. The moving part includes a second driving structure and a second sealing surface, with the second sealing surface disposed opposite to the first sealing surface. The first drive structure and the second drive structure are configured to interact to drive the mover assembly to move axially relative to the stator assembly; in the non-operating state, the second sealing surface seals against the first sealing surface to isolate the receiving cavity from the outside.

2. The blood pumping device according to claim 1, characterized in that, The moving part assembly includes a rotating shaft and an impeller. The rotating shaft is located inside the receiving cavity and one end protrudes from the through hole. The impeller is located outside the receiving cavity and is mounted on the rotating shaft. The first sealing surface is located at the end of the through hole away from the receiving cavity, and the second sealing surface is located on the side of the impeller facing the first sealing surface.

3. The blood pumping device according to claim 1, characterized in that, In the non-operating state, the moving part assembly forms a gap between itself and the stator assembly at the through-hole location, and the orthogonal projection of the gap along the axial direction satisfies at least one of the following: The orthographic projection area of ​​the second sealing surface surrounds the orthographic projection area of ​​the gap; The second sealing surface is cylindrical, and the orthographic projection area of ​​the second sealing surface falls on the outer edge of the projection area of ​​the gap.

4. The blood pumping device according to claim 1, characterized in that, The first drive structure and the second drive structure are configured to be magnetically coupled, and the first drive structure and the second drive structure are centrally misaligned along the axial direction.

5. The blood pumping device according to any one of claims 1 to 4, characterized in that, The moving part assembly includes a rotating shaft and a dynamic friction pair. The rotating shaft is located in the receiving cavity and one end protrudes from the through hole. The dynamic friction pair is disposed in the receiving cavity and surrounds the rotating shaft. The dynamic friction pair serves as the second driving structure.

6. The blood pumping device according to any one of claims 1 to 4, characterized in that, The first driving structure includes at least one of an electromagnet, an electromagnetic coil, and a permanent magnet.

7. The blood pumping device according to claim 2, characterized in that, The first driving structure includes a first soft magnetic component, and the mover assembly includes a permanent magnet. The permanent magnet is disposed in the receiving cavity and is arranged around the rotating shaft. The permanent magnet serves as the second driving structure. Along the axial direction, the first soft magnetic element is located on the side of the permanent magnet away from the impeller and is spaced apart from the permanent magnet. The first soft magnetic element is used to magnetically couple with the permanent magnet and generate a magnetic attraction force along the second sealing surface pointing towards the first sealing surface.

8. The blood pumping device according to claim 7, characterized in that, The first drive structure further includes a second soft magnetic component. Along the axial direction, the second soft magnetic component is located on the side of the permanent magnet closer to the impeller and is spaced apart from the permanent magnet. The volume of the first soft magnetic component is larger than the volume of the second soft magnetic component. The first soft magnetic component and the second soft magnetic component are configured to be able to magnetically couple with the permanent magnet and generate a magnetic attraction force along the second sealing surface pointing towards the first sealing surface.

9. The blood pumping device according to claim 2, characterized in that, The stator assembly also includes a pump housing, which includes a casing and a sealing end cover. The casing has an opening on the side facing the impeller, and the sealing end cover closes to the opening. The through hole penetrates the sealing end cover, and the first drive structure is located on the side of the sealing end cover away from the impeller. The mover assembly includes a permanent magnet disposed within the stator assembly and surrounding the rotating shaft, the permanent magnet serving as the second drive structure.

10. The blood pumping device according to claim 9, characterized in that, The housing serves as the first driving structure; or The pump housing has the receiving cavity, and the first drive structure is disposed within the receiving cavity.

11. The blood pumping device according to any one of claims 1 to 4, characterized in that, The blood pumping device also has an operating state, wherein the first sealing surface and the second sealing surface are configured to be relatively separated in the operating state.

12. The blood pumping device according to any one of claims 1 to 4, characterized in that, The first sealing surface and the second sealing surface are configured to form a sealing connection by abutment or snap-fit; or, The first sealing surface and the second sealing surface are configured to be sealed together by a flexible element.

13. The blood pumping device according to any one of claims 1-4, characterized in that, The stator assembly has a third sealing surface on the side facing the receiving cavity, and the third sealing surface is disposed along the axial direction on the side of the through hole away from the first sealing surface; The moving part assembly is provided with a fourth sealing surface. The third sealing surface and the fourth sealing surface are opposite to each other and are both arranged around the rotating shaft. Along the axial direction, the fourth sealing surface is located on the side of the third sealing surface away from the first sealing surface. The mover assembly is configured to move relative to the stator assembly along the axial direction in response to its own rotation; the blood pumping device also has an operating state in which the second sealing surface is separated from the first sealing surface, and the fourth sealing surface is sealed to the third sealing surface so that the receiving cavity is relatively isolated from the outside.

14. The blood pumping device according to claim 13, characterized in that, The stator assembly includes a pump housing and a first static friction pair, and the rotor assembly includes a rotating shaft, a permanent magnet, and a first dynamic friction pair. The first static friction pair, the first dynamic friction pair, and the permanent magnet are all located in the receiving cavity and arranged around the rotating shaft. Along the axial direction, the first static friction pair and the first dynamic friction pair are both located on the side of the permanent magnet closer to the through hole, and the first static friction pair is located on the side of the first dynamic friction pair away from the permanent magnet, and is sealed to the pump housing. The first static friction pair has a third sealing surface on the side facing the first dynamic friction pair, and the first dynamic friction pair has a fourth sealing surface on the side facing the first static friction pair.

15. The blood pumping device according to claim 14, characterized in that, The stator assembly further includes stator coils arranged around the permanent magnet; In the non-working state, along the axial direction, the center of the permanent magnet is located on the side of the stator coil away from the first sealing surface; In the operating state, the center of the permanent magnet along the axial direction and the center of the stator coil along the axial direction are aligned radially on the rotating shaft.

16. A ventricular assist device, characterized in that, Includes the blood pumping device according to any one of claims 1-15.

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