Blood pump

Abstract

The invention relates to a blood pump which comprises a pump body, a tube assembly and a locking assembly. The pump body is provided with a pump shell and a fluid pipe connected with the pump shell, the fluid pipe is communicated with an inner cavity of the pump shell, and a first protrusion is arranged on the periphery of the fluid pipe. The pipe assembly can be in butt joint with the fluid pipe, and a second protrusion is arranged on the periphery of the pipe assembly in a protruding mode. The locking assembly can be clamped with the first protrusion and the second protrusion so that the pipe assembly can be fixedly connected to the fluid pipe in a butt joint mode, and reliable connection between the fluid pipe and the pipe assembly is achieved. And the locking assembly is clamped with the second protrusion and the first protrusion, so that the connection reliability of the fluid pipe and the pipe assembly is improved, and the pipe assembly can be effectively prevented from being separated from the fluid pipe.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to a blood pump. Background Art

[0002] The ventricular assist device can assist the heart in pumping blood and is a commonly used device for assisting the treatment of cardiovascular diseases. In order to assist the heart in pumping blood, the inlet tube of the ventricular assist device extends into the ventricle (or atrium), and the outlet tube is connected to the artery. During operation, the ventricular assist device will transport blood in the heart to the artery. The fluid tube (inlet tube or outlet tube) of the ventricular assist device needs to be connected to the corresponding part (ventricle, atrium or artery) through a connecting pipe. However, the connection reliability of the fluid tube and the connecting pipe of the ventricular assist device in the related art is not high, and there is a risk of separation of the connecting pipe and the fluid tube. Summary of the Invention

[0003] Based on this, it is necessary to provide a blood pump to solve the problem of how to improve the connection reliability between the fluid tube and the connecting pipe.

[0004] The present application provides a blood pump, comprising:

[0005] A pump body, the pump body comprising a pump housing and a fluid pipe connected to the pump housing, the fluid pipe communicating with an inner cavity of the pump housing, and a first protrusion being provided on an outer circumference of the fluid pipe;

[0006] a pipe assembly capable of docking with the fluid pipe, wherein a second protrusion is provided on an outer periphery of the pipe assembly; and

[0007] A locking assembly is capable of engaging with the first protrusion and the second protrusion to fix the tube assembly to the fluid tube.

[0008] In one embodiment, the locking assembly includes a first ring body and a second ring body that are connected, and the first ring body and the second ring body are arranged at intervals along the axial direction of the first ring body. A locking groove that can engage with the first protrusion and the second protrusion is formed between the first ring body and the second ring body, wherein the first protrusion and the second protrusion are both engaged with the locking groove to at least prevent the tube assembly and the fluid tube from separating in the axial direction of the fluid tube.

[0009] In one embodiment, when the tube assembly is docked with the fluid tube, the first protrusion abuts against the second protrusion in the axial direction of the fluid tube, the first ring abuts against a side of the first protrusion away from the second protrusion, and the second ring abuts against a side of the second protrusion away from the first protrusion;

[0010] Alternatively, there are multiple first protrusions, and the multiple first protrusions are arranged at intervals along the circumference of the fluid pipe; there are multiple second protrusions, and the multiple second protrusions are arranged at intervals along the circumference of the pipe assembly; when the pipe assembly is docked with the fluid pipe, there is a second protrusion between every two adjacent first protrusions, and the first ring body and the second ring body respectively abut against two opposite surfaces of the first protrusion along the axial direction of the fluid pipe, and the first ring body and the second ring body respectively abut against two opposite surfaces of the second protrusion along the axial direction of the pipe assembly.

[0011] In one embodiment, the first protrusion is an annular protrusion provided on the fluid pipe, and the second protrusion is an annular protrusion provided on the pipe assembly. When the pipe assembly is docked with the fluid pipe, the first protrusion and the second protrusion abut in the axial direction of the fluid pipe, the first ring body abuts against the side of the first protrusion away from the second protrusion, and the second ring body abuts against the side of the second protrusion away from the first protrusion.

[0012] In one embodiment, the first ring body can be tightly fitted around the outer circumference of the fluid pipe, and the second ring body can be tightly fitted around the outer circumference of the pipe assembly, so that the first ring body and the second ring body can prevent the pipe assembly from rotating relative to the fluid pipe.

[0013] In one embodiment, the first ring body includes a first ring body and a plurality of first abutment protrusions arranged on the inner wall of the first ring body, and the plurality of first abutment protrusions are spaced along the circumference of the first ring body; the second ring body includes a second ring body and a plurality of second abutment protrusions arranged on the inner wall of the second ring body, and the plurality of second abutment protrusions are spaced along the circumference of the second ring body, and the engaging groove is formed between the first abutment protrusion and the second abutment protrusion; the end surface of the first abutment protrusion away from the first ring body is a first locking surface, and when the first ring body is tightly sleeved on the outer circumference of the fluid pipe, the first locking surface abuts against the outer circumferential surface of the fluid pipe; the end surface of the second abutment protrusion away from the second ring body is a second locking surface, and when the second ring body is tightly sleeved on the outer circumference of the pipe assembly, the second locking surface abuts against the outer circumferential surface of the pipe assembly.

[0014] In one embodiment, a first guide surface is formed at an end of the first protrusion away from the fluid pipe, and a distance from the first guide surface to the central axis of the fluid pipe gradually increases in a direction away from the pump housing;

[0015] A second guide surface is formed at an end of the second protrusion away from the pipe assembly, the pipe assembly having a butt end for butting against the fluid pipe, and a distance from the second guide surface to the central axis of the pipe assembly gradually increases in a direction approaching the butt end;

[0016] The first ring body includes a first ring body and a plurality of first abutment protrusions arranged on the inner wall of the first ring body, the first ring body is an open ring so that the inner diameter of the first ring body can be adjusted, and the plurality of first abutment protrusions are spaced along the circumference of the first ring body, the second ring body includes a second ring body and a plurality of second abutment protrusions arranged on the inner wall of the second ring body, the second ring body is an open ring so that the inner diameter of the second ring body can be adjusted, and the plurality of second abutment protrusions are spaced along the circumference of the second ring body, and the engaging groove is formed between the first abutment protrusion and the second abutment protrusion; when adjusting the inner diameters of the first ring body and the second ring body, the first abutment protrusion can slide along the first guide surface, and the second abutment protrusion can slide along the second guide surface.

[0017] In one embodiment, both the first guide surface and the second guide surface are convex arc surfaces;

[0018] And / or, a first sliding surface is formed on the end of the first abutting protrusion away from the first ring body, and the first sliding surface is an outwardly convex arc surface; a second sliding surface is formed on the end surface of the second abutting protrusion away from the second ring body, and the second sliding surface is an outwardly convex arc surface; when the inner diameters of the first ring body and the second ring body are adjusted, the first sliding surface can slide along the first guide surface, and the second sliding surface can slide along the second guide surface.

[0019] In one embodiment, the first guide surface has a first side close to the pump housing and a second side away from the pump housing, and the second guide surface has a third side close to the butt end of the pipe assembly and a fourth side away from the butt end;

[0020] When the first protrusion and the second protrusion are both engaged with the engaging groove, the first abutting protrusion abuts against the first guide surface, and the second abutting protrusion abuts against the second guide surface. The first abutting protrusion abuts against a first position of the first guide surface, and the first position is located between the first side and the second side. The second abutting protrusion abuts against a second position of the second guide surface, and the second position is located between the third side and the fourth side.

[0021] In one embodiment, a plug-in groove for the proximal end of the tube assembly to be plugged in is formed between the first protrusion and the outer peripheral surface of the fluid tube. The blood pump also includes a seal, which is arranged in the plug-in groove. When the tube assembly is docked with the fluid tube, the proximal end of the tube assembly is plugged into the plug-in groove and abuts against the seal.

[0022] In one embodiment, the locking assembly includes a first ring body, a second ring body, a connecting arm and a handle, the first ring body and the second ring body are both open rings, the first ring body has a first head end and a first tail end that are opposite and spaced apart, the second ring body has a second head end and a second tail end that are opposite and spaced apart, the first head end and the second head end are connected to form a first end, the first tail end and the second tail end are connected to form a second end, the first end and the second end are spaced apart to form an opening, the handle is rotatably connected to the first end, the connecting arm is rotatably connected to the handle, the connecting arm can be connected to the second end, when the connecting arm is connected to the second end, rotating the handle can drive the connecting arm to move so that the second end is close to or away from the first end to adjust the inner diameter of the first ring body and the second ring body.

[0023] In one embodiment, the blood pump also includes a puncture head, which is provided with a liquid inlet channel. The puncture head also has a docking section and a puncture section away from the docking section, the docking section is connected to the distal end of the tube assembly to connect the liquid inlet channel with the tube assembly, the puncture section has a liquid inlet connected to the liquid inlet channel, and an edge surrounding the liquid inlet, the liquid inlet is inclined relative to the central axis of the liquid inlet channel, the edge of the liquid inlet has a first edge and a second edge away from the docking section, the first edge and the second edge are connected to define the liquid inlet, wherein: the curvature radius of the second edge is greater than the curvature radius of the first edge close to the second edge, or the second edge is perpendicular to the central axis of the liquid inlet channel.

[0024] In one embodiment, the second side portion has a first connecting segment and a second connecting segment, and the first connecting segment and the second connecting segment are respectively connected to the two ends of the first side portion; the first side portion extends along a portion of an ellipse, and the angle between the extension direction of the first connecting segment and the extension direction of the first side portion is equal to the angle between the extension direction of the second connecting segment and the extension direction of the first side portion.

[0025] The blood pump of the present application includes a pump body, a tube assembly, and a locking assembly. The fluid tube of the pump body is connected to the inner cavity of the pump housing, and the tube assembly is connected to the fluid tube, so that the liquid in the tube assembly can flow to the inner cavity of the pump housing via the fluid tube, or the liquid in the inner cavity can flow to the tube assembly via the fluid tube. The locking assembly can engage with a first protrusion on the outer periphery of the fluid tube and a second protrusion on the outer periphery of the tube assembly, thereby achieving a reliable connection between the fluid tube and the tube assembly. In addition, the present application improves the connection reliability of the fluid tube and the tube assembly by engaging the locking assembly with the second protrusion and the first protrusion, and can effectively prevent the tube assembly from detaching from the fluid tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic structural diagram of the blood pump provided in this application from one perspective.

[0027] Figure 2 for Figure 1 Cross-sectional view along direction II.

[0028] Figure 3 for Figure 1 A partial assembly view of the tube assembly, fluid tube, and locking assembly of the blood pump is shown.

[0029] Figure 4 for Figure 3 Cross-sectional view along the II-II direction.

[0030] Figure 5 for Figure 1 The schematic diagram of the structure of the locking assembly of the blood pump is shown.

[0031] Figure 6 for Figure 4 A local enlarged view at P1.

[0032] Figure 7 for Figure 6 A partial enlarged view of the locking assembly when it is in the locked state.

[0033] Figure 8 for Figure 5 Another structural schematic diagram of the locking assembly is shown.

[0034] Figure 9 for Figure 1 Schematic diagram of the structure of the connector of the blood pump shown.

[0035] Figure 10 for Figure 9 Cross-sectional view along direction III-III.

[0036] Figure 11 for Figure 1 Schematic diagram of the structure of the fluid tube of the blood pump shown.

[0037] Figure 12for Figure 1 The blood pump is shown as a schematic structural diagram from another perspective.

[0038] Figure 13 for Figure 12 The schematic structural diagram of the puncture head of the blood pump is shown.

[0039] Figure 14 for Figure 13 Another structural schematic diagram of the puncture head shown.

[0040] Figure 15 for Figure 13 Another structural schematic diagram of the puncture head shown.

[0041] Figure 16 (a) Figure 15 The schematic diagram of the intersection of the second side portion and the first side portion of the puncture head is shown. Figure 16 (b) and (c) are schematic diagrams of the intersection of the second side and the first side in other situations.

[0042] Description of reference numerals:

[0043] 10. Blood pump; 100. Pump body; 110. Pump housing; 130. Fluid tube; 131. First protrusion; 1312. First surface; 1317. First side; 1318. First guide surface; 1319. Second side; 133. First pipe section; 135. Second pipe section; 137. Connecting slot; 140. Impeller; 200. Tube assembly; 220. Connector; 221. Second protrusion; 2212. Second surface; 2217. Third side; 2218. Second guide surface; 2219, fourth side; 223, sleeve portion; 2231, main body; 2233, docking end; 2235, step surface; 2237, second inner circumferential surface; 225, tube portion; 2252, first inner circumferential surface; 2254, outer surface; 2255, docking surface; 2257, protrusion; 2258, guide surface; 2259, stop surface; 240, connecting pipe; 300, locking assembly; 320, first ring body; 323, first head end; 3 25. First tail end; 327. First main body; 328. First ring body; 329. First abutting protrusion; 3291. First locking surface; 3295. First sliding surface; 330. First end; 340. Second ring body; 343. Second head end; 345. Second tail end; 347. Second main body; 348. Second ring body; 349. Second abutting protrusion; 3491. Second locking surface; 3495. Second sliding surface; 350. Second end; 360. Engaging groove; 370, arc-shaped groove; 380, connecting arm; 390, handle; 500, drive motor; 600, sealing element; 700, puncture head; 710, liquid inlet channel; 730, docking section; 750, puncture section; 752, liquid inlet; 754, first side; 7541, first side section; 7543, second side section; 756, second side; 7561, first connecting section; 7563, second connecting section; 770, groove; L, center axis. DETAILED DESCRIPTION

[0044] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0045] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0046] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0047] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0048] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0049] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only embodiment.

[0050] It should be noted that, in the application, the axial direction of each component refers to the extension direction of the central axis of each component, the circumferential direction of each component refers to the circumferential direction of each component, and the radial direction of each component refers to the straight line direction along the radius or diameter of the component, which is perpendicular to the axial direction.

[0051] To assist the heart in pumping blood, the fluid tubes (inlet or outlet) of a ventricular assist device (VAD) must be connected to the corresponding location (ventricle, atrium, or artery) through connecting pipes. Traditional VADs have unreliable connections between the fluid tubes and connecting pipes, creating a risk of separation.

[0052] To this end, the present application provides a blood pump that provides a more reliable connection between the fluid tube and the connecting pipe. Compared to the traditional locking method of directly pressing the tube assembly against the locking assembly and the fluid tube, the blood pump of the present application is provided with a first protrusion on the outer circumference of the fluid tube and a second protrusion on the outer circumference of the tube assembly. The locking assembly engages with the second protrusion and the first protrusion, thereby improving the reliability of the connection between the fluid tube and the tube assembly and effectively preventing the tube assembly from detaching from the fluid tube. The blood pump provided by the present application is described in detail below in conjunction with the specific embodiments and the accompanying drawings.

[0053] See also Figures 1 to 3The blood pump 10 provided in the present application includes a pump body 100, a tube assembly 200, and a locking assembly 300. The pump body 100 includes a pump housing 110 and a fluid tube 130 connected to the pump housing 110. The fluid tube 130 is in communication with the inner cavity of the pump housing 110. The tube assembly 200 can be docked with the fluid tube 130, so that the liquid (such as blood) in the tube assembly 200 can flow to the inner cavity of the pump housing 110 via the fluid tube 130, or the liquid in the inner cavity can flow to the tube assembly 200 via the fluid tube 130. A first protrusion 131 is provided on the outer circumference of the fluid tube 130. A second protrusion 221 is provided on the outer circumference of the tube assembly 200. The locking assembly 300 can engage with the first protrusion 131 and the second protrusion 221 to fix the tube assembly 200 to the fluid tube 130, thereby achieving a reliable connection between the fluid tube 130 and the tube assembly 200. The locking assembly 300 is engaged with the second protrusion 221 and the first protrusion 131 , thereby improving the connection reliability between the fluid pipe 130 and the pipe assembly 200 and effectively preventing the pipe assembly 200 from being separated from the fluid pipe 130 .

[0054] In this embodiment, the pump housing 110 is roughly in the shape of a volute. The fluid tube 130 is disposed on the pump housing 110 and is in communication with the inner cavity of the pump housing 110. In this embodiment, the fluid tube 130 is the inlet tube of the blood pump 10, that is, blood can flow from the tube assembly 200 to the inner cavity of the pump housing 110 via the fluid tube 130. In other embodiments, the fluid tube 130 can also be an outlet tube, that is, blood in the inner cavity can flow to the tube assembly 200 via the fluid tube 130. The pump body 100 also includes an impeller 140, which is rotatably disposed in the inner cavity of the pump housing 110. Under the action of the rotation of the impeller 140, blood can enter the inner cavity of the pump housing 110 and then flow out of the inner cavity.

[0055] The blood pump 10 also includes a drive motor 500. In this embodiment, the drive motor 500 is connected to the side of the pump housing 110 facing away from the tube assembly 200. In other embodiments, the drive motor 500 is connected to the side of the pump housing 110 facing the tube assembly 200, and the specific direction can be set according to actual circumstances. The drive motor 500 is in transmission engagement with the impeller 140 to drive the impeller 140 to rotate. For example, the drive motor 500 includes a stator and a rotor. The rotor is fixedly connected to the impeller 140, and the stator and rotor are magnetically engaged, causing the rotor to rotate, thereby driving the impeller 140 to rotate.

[0056] The locking assembly 300 has a locked state and an unlocked state. When the locking assembly 300 is in the locked state, the locking assembly 300 engages with the first protrusion 131 and the second protrusion 221 to secure the tube assembly 200 to the fluid tube 130. When the locking assembly 300 is in the unlocked state, the locking assembly 300 is disengaged from the first protrusion 131 and the second protrusion 221, and the tube assembly 200 can be detached from the fluid tube 130.

[0057] See also Figure 3 and Figure 4 The locking assembly 300 includes a first ring body 320 and a second ring body 340 connected to each other. The first ring body 320 and the second ring body 340 are spaced apart along the axial direction of the first ring body 320, so that an engagement groove 360 ​​is formed between the first ring body 320 and the second ring body 340, which can engage with the first protrusion 131 and the second protrusion 221. The first protrusion 131 and the second protrusion 221 are both engaged with the engagement groove 360 ​​to at least prevent the tube assembly 200 and the fluid tube 130 from separating in the axial direction of the fluid tube 130, thereby achieving axial positioning of the tube assembly 200.

[0058] See also Figures 4 to 6 In this embodiment, when the tube assembly 200 is docked with the fluid tube 130, the first protrusion 131 and the second protrusion 221 abut in the axial direction of the fluid tube 130, the first ring body 320 abuts against the side of the first protrusion 131 away from the second protrusion 221, and the second ring body 340 abuts against the side of the second protrusion 221 away from the first protrusion 131, so that the first protrusion 131 and the second protrusion 221 can be pressed between the first ring body 320 and the second ring body 340, that is, the first protrusion 131 and the second protrusion 221 are engaged in the engaging groove 360 ​​to prevent the tube assembly 200 and the fluid tube 130 from separating in the axial direction of the fluid tube 130, thereby improving the connection reliability of the fluid tube 130 and the tube assembly 200 and preventing the tube assembly 200 from detaching from the fluid tube 130.

[0059] In the illustrated embodiment, the first protrusion 131 is an annular protrusion provided on the fluid tube 130. That is, the first protrusion 131 is a single annular protrusion provided on the fluid tube 130 and extending along the circumference of the fluid tube 130. The second protrusion 221 is an annular protrusion provided on the tube assembly 200. That is, the second protrusion 221 is a single annular protrusion provided on the tube assembly 200 and extending along the circumference of the tube assembly 200. When the tube assembly 200 is mated with the fluid tube 130, the first protrusion 131 and the second protrusion 221 abut in the axial direction of the fluid tube 130, the first ring body 320 abuts against the side of the first protrusion 131 away from the second protrusion 221, and the second ring body 340 abuts against the side of the second protrusion 221 away from the first protrusion 131. Since the first protrusion 131 and the second protrusion 221 are both annular protrusions, the area of ​​the surface where the first protrusion 131 abuts the second protrusion 221, the area of ​​the surface where the first ring body 320 abuts the first protrusion 131, and the area of ​​the surface where the second ring body 340 abuts the second protrusion 221 are all large enough, thereby improving the connection reliability of the fluid pipe 130 and the pipe assembly 200.

[0060] The first protrusion 131 and the second protrusion 221 are not limited to being a single annular protrusion. In some embodiments, there are multiple first protrusions 131, and the multiple first protrusions 131 are arranged at intervals along the circumference of the fluid tube 130; there are multiple second protrusions 221, and the multiple second protrusions 221 are arranged at intervals along the circumference of the tube assembly 200. When the tube assembly 200 is docked with the fluid tube 130, each first protrusion 131 abuts against a second protrusion 221 in the axial direction of the fluid tube 130, the first ring body 320 abuts against the side of the multiple first protrusions 131 away from the second protrusions 221, and the second ring body 340 abuts against the side of the multiple second protrusions 221 away from the first protrusion 131, so that the multiple first protrusions 131 and the multiple second protrusions 221 can be pressed between the first ring body 320 and the second ring body 340, that is, the multiple first protrusions 131 and the multiple second protrusions 221 are all engaged with the engaging groove 360 ​​to prevent the tube assembly 200 and the fluid tube 130 from separating in the axial direction of the fluid tube 130.

[0061] Specifically, the first protrusion 131 has a first surface 1312 facing the second protrusion 221, and the second protrusion 221 has a second surface 2212 facing the first protrusion 131. When the tube assembly 200 is docked with the fluid tube 130, the first surface 1312 and the second surface 2212 fit together and abut against each other, avoiding the formation of a gap between the first surface 1312 and the second surface 2212 that can accommodate blood, and avoiding as much as possible the accumulation of blood between the first surface 1312 and the second surface 2212 to cause thrombosis.

[0062] In other embodiments, the engagement of the first protrusion 131 and the second protrusion 221 with the engagement groove 360 ​​not only prevents the tube assembly 200 and the fluid tube 130 from separating in the axial direction of the fluid tube 130, but also prevents the tube assembly 200 from rotating relative to the fluid tube 130, thereby limiting the tube assembly 200 in both the axial and circumferential directions. Specifically, there are multiple first protrusions 131, each of which is spaced apart along the circumference of the fluid tube 130. There are multiple second protrusions 221, each of which is spaced apart along the circumference of the tube assembly 200. When the tube assembly 200 and the fluid tube 130 are docked, a second protrusion 221 is located between every two adjacent first protrusions 131, and a first protrusion 131 is located between every two adjacent second protrusions 221, thereby preventing the fluid tube 130 from rotating relative to the tube assembly 200. The first ring body 320 and the second ring body 340 respectively abut against two opposing surfaces of the first protrusion 131 along the axial direction of the fluid tube 130, and the first ring body 320 and the second ring body 340 respectively abut against two opposing surfaces of the second protrusion 221 along the axial direction of the tube assembly 200, so that the first protrusion 131 and the second protrusion 221 can be respectively compressed between the first ring body 320 and the second ring body 340, preventing the tube assembly 200 and the fluid tube 130 from separating in the axial direction of the fluid tube 130, thereby limiting the position of the tube assembly 200 in both the axial and circumferential directions. In some embodiments, a plurality of first protrusions 131 are evenly distributed along the circumference of the fluid tube 130, and a plurality of second protrusions 221 are evenly distributed along the circumference of the tube assembly 200. In some embodiments, multiple first protrusions 131 are unevenly arranged along the circumference of the fluid tube 130, and multiple second protrusions 221 are unevenly arranged along the circumference of the tube assembly 200, as long as there is a second protrusion 221 between every two adjacent first protrusions 131 and a first protrusion 131 between every two adjacent second protrusions 221.

[0063] See also Figures 4 to 8 In the illustrated embodiment, the locking assembly 300 is generally in the shape of an open ring, and the inner diameter of the locking assembly 300 is adjustable. By adjusting the inner diameter of the locking assembly 300, the locking assembly 300 is engaged with the first protrusion 131 and the second protrusion 221. Therefore, in this embodiment, when the locking assembly 300 is in the locked state, the inner diameter of the locking assembly 300 is reduced, and the locking assembly 300 is engaged with the first protrusion 131 and the second protrusion 221, thereby securing the tube assembly 200 to the fluid tube 130. When the locking assembly 300 is in the unlocked state, the inner diameter of the locking assembly 300 is increased, and the locking assembly 300 is disengaged from the first protrusion 131 and the second protrusion 221, allowing the tube assembly 200 to be detached from the fluid tube 130.

[0064] Specifically, the first ring body 320 and the second ring body 340 are both open rings, such that the inner diameters of the first ring body 320 and the second ring body 340 are adjustable. Specifically, the first ring body 320 has a first head end 323 and a first tail end 325 that are opposed and spaced apart, with the first head end 323 and the first tail end 325 being spaced apart along the circumference of the first ring body 320. The second ring body 340 has a second head end 343 and a second tail end 345 that are opposed and spaced apart, with the second head end 343 and the second tail end 345 being spaced apart along the circumference of the second ring body 340. The first head end 323 and the second head end 343 are connected to form a first end 330, and the first tail end 325 and the second tail end 345 are connected to form a second end 350. The first end 330 and the second end 350 are spaced apart to form an opening.

[0065] First ring body 320 further includes a first main body 327, which is connected between first head end 323 and first tail end 325. First main body 327 has a generally arc-shaped structure. Second ring body 340 further includes a second main body 347, which is connected between second head end 343 and second tail end 345. Second main body 347 has a generally arc-shaped structure. First main body 327 and second main body 347 are spaced apart along the axial direction of first ring body 320.

[0066] The first ring body 320 includes a first ring body 328 and a plurality of first abutting protrusions 329 disposed on the inner wall of the first ring body 328. The first ring body 328 is an open ring, allowing the inner diameter of the first ring body 328 to be adjusted. The plurality of first abutting protrusions 329 are spaced circumferentially around the first ring body 320. The second ring body 340 includes a second ring body 348 and a plurality of second abutting protrusions 349 disposed on the inner wall of the second ring body 348. The second ring body 348 is an open ring, allowing the inner diameter of the second ring body 348 to be adjusted. The plurality of second abutting protrusions 349 are spaced circumferentially around the second ring body 340. An engaging groove 360 ​​is formed between the first abutting protrusion 329 and the second abutting protrusion 349, so that the first protrusion 131 and the second protrusion 221 can engage between the first abutting protrusion 329 and the second abutting protrusion 349. Specifically, when the locking assembly 300 is in the locked state, the first abutting protrusion 329 can abut against the side of the first protrusion 131 away from the second protrusion 221 , and the second abutting protrusion 349 can abut against the side of the second protrusion 221 away from the first protrusion 131 .

[0067] Multiple first abutment protrusions 329 are provided on the inner wall of the first ring body 328, increasing the maximum radial thickness of the first ring body 320. This allows the first abutment protrusions 329 to abut against the first protrusions 131 even when the inner diameter of the first ring body 320 is slightly reduced, facilitating the first ring body 320 to abut against the fluid tube 130. The multiple first abutment protrusions 329 are spaced circumferentially along the first ring body 320, making the first ring body 320 more easily deformable, facilitating its inward retraction and making operation more convenient. Therefore, the multiple first abutment protrusions 329 spaced circumferentially along the inner wall of the first ring body 320 not only facilitate the first ring body 320 to abut against the fluid tube 130 but also facilitate operation.

[0068] Multiple second abutment protrusions 349 are provided on the inner wall of the second ring body 348, increasing the maximum radial thickness of the second ring body 340. This allows the second abutment protrusions 349 to abut against the second protrusions 221 even with a relatively small reduction in the inner diameter of the second ring body 340, facilitating the second ring body 340's tight contact with the tube assembly 200. The multiple second abutment protrusions 349 are spaced circumferentially along the second ring body 340, making it easier for the second ring body 340 to deform, facilitating its inward retraction and facilitating operation. Therefore, the multiple second abutment protrusions 349 spaced circumferentially along the inner wall of the second ring body 340 not only facilitate the tight contact of the second ring body 340 with the tube assembly 200 but also facilitate operation. This results in a smoother locking process for the locking assembly 300.

[0069] In this embodiment, the first head end 323, the first tail end 325, and the first body 327 are all disposed on the first ring body 328, and each of the first head end 323, the first tail end 325, and the first body 327 is provided with a first abutting protrusion 329. The second head end 343, the second tail end 345, and the second body 347 are all disposed on the second ring body 348, and each of the second head end 343, the second tail end 345, and the second body 347 is provided with a second abutting protrusion 349. In other words, the engaging groove 360 ​​also includes a plurality of groove segments spaced apart along the circumference of the first ring body 320.

[0070] In this embodiment, the first abutting protrusion 329 of the first ring body 320 corresponds to the second abutting protrusion 349 of the second ring body 340 in position, that is, the first abutting protrusion 329 of the first ring body 320 and the second abutting protrusion of the second ring body 340 are aligned in the axial direction of the first ring body 320. In other words, the projection of the first abutting protrusion 329 on the second abutting protrusion 349 along the axial direction of the first ring body 320 coincides with the boundary of the second abutting protrusion 349, thereby increasing the circumferential length of the engaging groove 360 ​​along the first ring body 320. This allows for more stable engagement between the first protrusion 131, the second protrusion 221, and the engaging groove 360, thereby improving the connection reliability between the fluid pipe 130 and the pipe assembly 200. It should be noted that, in this embodiment, the position of the first abutment protrusion 329 of the first head end 323 corresponds to the position of the second abutment protrusion 349 of the second head end 343, the position of the first abutment protrusion 329 of the first body 327 corresponds to the position of the second abutment protrusion 349 of the second body 347, and the position of the first abutment protrusion 329 of the first tail end 325 corresponds to the position of the second abutment protrusion 349 of the second tail end 345.

[0071] Please continue reading Figures 4 to 6 A first guide surface 1318 is formed on the end of the first protrusion 131 away from the fluid tube 130. The distance between the first guide surface 1318 and the central axis of the fluid tube 130 gradually increases as it moves away from the pump housing 110. When the inner diameters of the first ring body 320 and the second ring body 340 are adjusted, or in other words, when the inner diameters of the first ring body 328 and the second ring body 348 are adjusted, the first abutting protrusion 329 can slide along the first guide surface 1318, thereby guiding the first abutting protrusion 329 toward or away from the second abutting protrusion 349.

[0072] A second guide surface 2218 is formed on the end of second protrusion 221 away from tube assembly 200. Tube assembly 200 has a butting end 2233 for butting against fluid tube 130. The distance between second guide surface 2218 and the central axis of tube assembly 200 gradually increases as it approaches butting end 2233. When the inner diameters of first ring body 320 and second ring body 340 are adjusted, or in other words, when the inner diameters of first ring body 328 and second ring body 348 are adjusted, second abutting protrusion 349 can slide along second guide surface 2218, thereby guiding second abutting protrusion 349 toward or away from first abutting protrusion 329.

[0073] Specifically, when the locking assembly 300 is locked, the first abutting protrusion 329 can slide along the first guide surface 1318 to guide the first ring body 320 to move axially away from the second ring body 340 and to retract radially inwardly of the first ring body 320. The second abutting protrusion 349 can slide along the second guide surface 2218 to guide the second ring body 340 to move axially away from the first ring body 320 and to retract radially inwardly of the second ring body 340. In other words, the locking assembly 300 is guided by the first guide surface 1318 and the second guide surface 2218 during the locking process, making the locking process of the locking assembly 300 smoother. When the locking assembly 300 is unlocked, the first abutment protrusion 329 can slide along the first guide surface 1318 to guide the first ring body 320 to move axially toward the second ring body 340 and expand radially outward along the first ring body 320; the second abutment protrusion 349 can slide along the second guide surface 2218 to guide the second ring body 340 to move axially toward the first ring body 320 and expand radially outward along the second ring body 340.

[0074] In this embodiment, both the first guide surface 1318 and the second guide surface 2218 are convex arc surfaces. The curvature of the convex arc surfaces makes the contact stress distribution more uniform, minimizing the local high-pressure area caused by the abutment between the first abutting protrusion 329 and the second abutting protrusion 349, and reducing damage to the first abutting protrusion 329 and the second abutting protrusion 349.

[0075] A first sliding surface 3295 is formed on the end of the first abutting protrusion 329 away from the first ring body 328. The first sliding surface 3295 is an outwardly convex arcuate surface. A second sliding surface 3495 is formed on the end of the second abutting protrusion 349 away from the second ring body 348. When the inner diameters of the first and second ring bodies 320 and 340 are adjusted, the first sliding surface 3295 can slide along the first guide surface 1318, and the second sliding surface 3495 can slide along the second guide surface 2218. The curvature of the first and second sliding surfaces 3295 and 3495 ensures a more uniform distribution of contact stress, reducing damage to the first and second protrusions 131 and 221.

[0076] In other embodiments, the first guide surface 1318 and the second guide surface 2218 may also be inclined surfaces. The first sliding surface 3295 and the second sliding surface 3495 may also be inclined surfaces.

[0077] See also Figure 2 、 Figure 6 and Figure 7First guide surface 1318 has a first side 1317 proximal to pump housing 110 and a second side 1319 distal to pump housing 110. Second guide surface 2218 has a third side 2217 proximal to butt end 2233 of tube assembly 200 and a fourth side 2219 distal to butt end 2233. When both first protrusion 131 and second protrusion 221 are engaged with engagement groove 360, first abutting protrusion 329 abuts against first guide surface 1318, and second abutting protrusion 349 abuts against second guide surface 2218. First abutting protrusion 329 abuts against first guide surface 1318 at a first position between first side 1317 and second side 1319, while second abutting protrusion 349 abuts against second guide surface 2218 at a second position between third side 2217 and fourth side 2219. The first abutting force F1 of the first abutting protrusion 329 on the first protrusion 131 is inclined relative to the radial direction and the axial direction of the first ring body 320. In this way, the first abutting force F1 will generate a first clamping force F1 along the radial direction. ＇ and the first locking force F1 along the axial direction ＇＇ , so as to achieve radial and axial locking of the fluid tube 130. It can be understood that the second abutting force F2 of the second abutting protrusion 349 on the second protrusion 221 will also generate a second clamping force F2 in the radial direction. ＇ and the second locking force F2 along the axial direction ＇＇ , so as to achieve radial and axial locking of the tube assembly 200 and more effectively prevent the tube assembly 200 from being separated from the fluid tube 130.

[0078] The locking assembly 300 can be locked to the tube assembly 200 and the fluid tube 130 in addition to the first ring body 320 abutting against the first protrusion 131 and the second ring body 340 abutting against the second protrusion 221. In other embodiments, the first ring body 320 can be tightly fitted around the outer circumference of the fluid tube 130, and the second ring body 340 can be tightly fitted around the outer circumference of the tube assembly 200, so that the first ring body 320 and the second ring body 340 can prevent the tube assembly 200 from rotating relative to the fluid tube 130. That is, the first ring body 320 is tightly fitted around the outer circumference of the fluid tube 130, and the second ring body 340 is tightly fitted around the outer circumference of the tube assembly 200, so that the tube assembly 200 is prevented from rotating circumferentially relative to the fluid tube 130, thereby achieving circumferential positioning of the tube assembly 200. In this way, in addition to limiting the position of the tube assembly 200 in the axial direction, the tube assembly 200 is also limited in the circumferential direction. This increases the reliability of the connection between the tube assembly 200 and the fluid pipe 130, thereby preventing the tube assembly 200 from detaching from the fluid pipe 130. In this embodiment, a plurality of first abutting protrusions 329 can abut the outer circumferential surface of the fluid pipe 130. A plurality of second abutting protrusions 349 can abut the outer circumferential surface of the tube assembly 200. The end surface of the first abutting protrusion 329, which is away from the first ring body 328, is a first locking surface 3291. When the first ring body 320 is tightly fitted around the outer circumference of the fluid pipe 130, the first locking surface 3291 abuts the outer circumferential surface of the fluid pipe 130, preventing the first ring body 320 from rotating relative to the fluid pipe 130. The end surface of the second abutting protrusion 349, facing away from the second ring body 348, forms a second locking surface 3491. When the second ring body 340 is tightly fitted around the outer circumference of the tube assembly 200, the second locking surface 3491 abuts against the outer circumference of the tube assembly 200, preventing the second ring body 340 from rotating relative to the tube assembly 200. The connection between the first ring body 320 and the second ring body 340 prevents the tube assembly 200 from rotating circumferentially relative to the fluid tube 130, thereby securing the tube assembly 200 in the circumferential direction. Furthermore, the first locking surface 3291 is a curved surface. The curvature of the first locking surface 3291 matches that of the outer circumference of the fluid tube 130, increasing the contact area between the first locking surface 3291 and the outer circumference of the fluid tube 130 and improving the grip of the first ring body 320 against the fluid tube 130. The second locking surface 3491 is a curved surface. The curvature of the second locking surface 3491 is consistent with the curvature of the outer peripheral surface of the pipe assembly 200, so that when the second locking surface 3491 abuts the outer peripheral surface of the pipe assembly 200, the contact area between the two will be larger, and the second ring body 340 will have a better clamping effect on the pipe assembly 200.

[0079] In other embodiments, the inner wall of the first ring body 320 may not be provided with the first abutting protrusion 329, and the inner wall of the second ring body 340 may not be provided with the second abutting protrusion 349. The first body 327 and the second body 347 are spaced apart along the axial direction of the first ring body 320 to form an engaging groove 360 ​​capable of engaging with the first protrusion 131 and the second protrusion 221, so that the first protrusion 131 and the second protrusion 221 are engaged between the first ring body 320 and the second ring body 340. Furthermore, there may be a plurality of engaging grooves 360, each extending along the circumference of the first ring body 320, and the plurality of engaging grooves 360 are spaced apart from each other. Correspondingly, there are also multiple first protrusions 131 and second protrusions 221. The multiple first protrusions 131 are spaced apart along the circumference of the fluid tube 130, and the multiple second protrusions 221 are spaced apart along the circumference of the tube assembly 200. Each first protrusion 131 and each second protrusion 221 engages with a respective engagement groove 360. Thus, the engagement of both the first protrusion 131 and the second protrusion 221 with the engagement groove 360 ​​not only prevents the tube assembly 200 and the fluid tube 130 from separating in the axial direction of the fluid tube 130, but also prevents the tube assembly 200 and the fluid tube 130 from separating in the circumferential direction of the fluid tube 130.

[0080] See also Figure 5 、 Figure 6 and Figure 8 In the illustrated embodiment, the locking assembly 300 further defines an arcuate groove 370 disposed between the first ring body 328 and the second ring body 348. Specifically, the arcuate groove 370 is disposed between the first body 327 and the second body 347, such that the first ring body 320 and the second ring body 340 are spaced apart along the axial direction of the first ring body 320. The arcuate groove 370 communicates with the engaging groove 360. When the locking assembly 300 is in a locked state, the first protrusion 131 and the second protrusion 221 are engaged between the first ring body 320 and the second ring body 340, so that the first ring body 320 and the second ring body 340 will deform along the axial direction of the first ring body 320, so that there is elastic abutment between the first ring body 320 and the first protrusion 131, and between the second ring body 340 and the second protrusion 221. Compared with the rigid abutment method, the elastic abutment can reduce the damage to the first protrusion 131 and the second protrusion 221 during abutment while maintaining the abutment force between the first ring body 320 and the first protrusion 131, the second ring body 340 and the second protrusion 221.

[0081] In other embodiments, the first ring body 320 does not include the first abutting protrusion 329 , the second ring body 340 does not include the second abutting protrusion 349 , and the first protrusion 131 and the second protrusion 221 are engaged with the arcuate groove 370 , that is, the arcuate groove 370 is an engaging groove.

[0082] See also Figure 2 、 Figure 6 、 Figure 9 and Figure 10 A plug-in groove 137 is formed between the first protrusion 131 and the outer peripheral surface of the fluid tube 130 , and the proximal end of the tube assembly 200 is plugged into the plug-in groove 137 to achieve docking between the tube assembly 200 and the fluid tube 130 .

[0083] Specifically, the pipe assembly 200 includes a connector 220 and a connecting pipe 240. The connector 220 is disposed at the proximal end of the connecting pipe 240. The connector 220 includes a sleeve portion 223 and a pipe portion 225 axially connected. The pipe portion 225 is connected to the connecting pipe 240, and the sleeve portion 223 is connected to the fluid pipe 130. The pipe portion 225 is inserted into the connecting pipe 240 to connect therewith. The sleeve portion 223 is fixedly connected to the fluid pipe 130, so that the connector 220 is connected to the pump body 100 via the fluid pipe 130. In this way, the connecting pipe 240 can be fixedly connected to the pump body 100 through the connection between the connector 220 and the fluid pipe 130 at the end. The connection between the pipe portion 225 and the connecting pipe 240 can be threaded, welded, or the like. In this embodiment, the connector 220 is provided with a second protrusion 221. Specifically, the second protrusion 221 is protruding from the outer circumference of the sleeve portion 223. The second protrusion 221 separates the sleeve portion 223 into a main portion 2231 and a butt end 2233. Both the main portion 2231 and the butt end 2233 are tubular structures, wherein the end of the main portion 2231 away from the butt end 2233 is connected to the tube portion 225, and the butt end 2233 is inserted into the insertion groove 137.

[0084] In one embodiment, the connector 220 further has a stepped surface 2235. The tube portion 225 has a first inner circumferential surface 2252, and the sleeve portion 223 has a second inner circumferential surface 2237. The diameter of the first inner circumferential surface 2252 is smaller than the diameter of the second inner circumferential surface 2237. The stepped surface 2235 connects the first inner circumferential surface 2252 and the second inner circumferential surface 2237. The distal end of the fluid tube 130 is received in the sleeve portion 223 and abuts against the stepped surface 2235.

[0085] See also Figure 4 、 Figure 10 and Figure 11The fluid pipe 130 has a first pipe section 133 and a second pipe section 135 connected to the first pipe section 133. The second pipe section 135 is connected to the first pipe section 133 and is coaxially arranged. The first pipe section 133 is connected to the pump housing 110. For example, the first pipe section 133 can be welded to the pump housing 110. The second pipe section 135 is connected to the joint 220. The second pipe section 135 is accommodated in the sleeve portion 223. Specifically, the outer circumferential surface of the second pipe section 135 is in contact with the second inner circumferential surface 2237 of the sleeve portion 223, and the end of the second pipe section 135 away from the first pipe section 133 is in contact with the step surface 2235, so that the fluid pipe 130 and the joint 220 are assembled in place, thereby realizing a reliable connection between the fluid pipe 130 and the joint 220. The outer diameter of the second pipe section 135 is smaller than the outer diameter of the first pipe section 133.

[0086] When the second pipe section 135 is inserted into the sleeve portion 223, the end of the second pipe section 135 facing away from the first pipe section 133 can abut the step surface 2235. In other words, when the fluid pipe 130 is connected to the connector 220, the fluid pipe 130 can abut the step surface 2235, indicating that the fluid pipe 130 and the connector 220 are properly assembled.

[0087] The second tube segment 135 mates with the sleeve portion 223 of the connector 220. The second protrusion 221 extends from the end of the first tube segment 133, closest to the second tube segment 135, along the axial direction of the first tube segment 133 and is coaxial with the second tube segment 135. Specifically, the second tube segment 135 and the second protrusion 221 both extend from the same end of the first tube segment 133. The outer diameter of the second tube segment 135 is smaller than the inner diameter of the second protrusion 221, thereby separating the second tube segment 135 and the second protrusion 221. The second protrusion 221 and the second tube segment 135 are spaced apart to form a connecting groove 137, which is an annular groove. The wall of the sleeve portion 223, distal from the tube portion 225, is received in the connecting groove 137, thereby enabling the fluid tube 130 to mate with the connector 220. Specifically, the connecting end 2233 is inserted into the connecting groove 137.

[0088] That is to say, when the connector 220 is docked with the fluid pipe 130, the second pipe section 135 is inserted into the sleeve portion 223, and the end of the second pipe section 135 abuts the step surface 2235. At the same time, the first protrusion 131 and the second protrusion 221 abut against each other along the axial direction of the fluid pipe 130, and the docking end 2233 is inserted into the plug-in groove 137, thereby realizing the connection between the connector 220 and the fluid pipe 130.

[0089] See also Figure 4 、 Figure 9 and Figure 10The sleeve portion 223 has an outer surface 2254 and a docking surface 2255 connected to the outer surface 2254. The docking surface 2255 abuts against the proximal end of the connecting tube 240 to limit the docking depth of the connecting tube 240 and the connector 220, thereby preventing the connector 220 from excessively entering the connecting tube 240. The provision of the docking surface 2255 can also help the operator determine whether the connecting tube 240 and the connector 220 are properly docked. For example, when the operator docks the connector 220 with the connecting tube 240, the docking surface 2255 abuts against the proximal end of the connecting tube 240, indicating that the connecting tube 240 and the connector 220 are properly docked. Specifically, the docking surface 2255 abuts against the end of the proximal end of the connecting tube 240.

[0090] The tube portion 225 also has a protrusion 2257 that protrudes from the outer surface 2254. The protrusion 2257 has a guide surface 2258. The distance between the guide surface 2258 and the outer surface 2254 gradually increases along the direction from the tube portion 225 to the sleeve portion 223, causing the guide surface 2258 to be inclined toward the connecting tube 240, thereby providing a guiding function to guide the connection between the tube portion 225 and the connecting tube 240. In this embodiment, the guide surface 2258 is a curved surface. In other embodiments, the guide surface 2258 may also be an inclined surface.

[0091] When the joint 220 is docked with the connecting tube 240, the guide surface 2258 can guide the tube portion 225 to be inserted into the connecting tube 240. By heating the connecting tube 240, the connecting tube 240 shrinks, so that the connecting tube 240 forms a receiving groove for accommodating the protrusion 2257. The protrusion 2257 engages with the receiving groove to fix the joint 220 and the connecting tube 240.

[0092] In one embodiment, the protrusion 2257 further comprises a stop surface 2259 on the side facing away from the connecting tube 240. The stop surface 2259 can retain the tube 225 in the connecting tube 240. Thus, after the tube 225 is connected to the connecting tube 240, the protrusion 2257 can be locked onto the inner wall of the connecting tube 240 via the stop surface 2259, effectively preventing the tube 225 from separating from the connecting tube 240 and improving the reliability of the connection between the tube 225 and the connecting tube 240. The stop surface 2259 connects the outer surface 2254 and the guide surface 2258. The stop surface 2259 is spaced apart from and opposite to the docking surface 2255. At least a portion of the proximal end of the connecting tube 240 is embedded between the stop surface 2259 and the docking surface 2255, thereby preventing the connector 220 from separating from the connecting tube 240. Exemplarily, the proximal end of the connecting tube 240 is made of hot-melt material. After the tube portion 225 is inserted into the connecting tube 240 and connected to the connecting tube 240 under the guidance of the guide surface 2258, the proximal end of the connecting tube 240 is heat-treated, and the connecting tube 240 shrinks so that part of the connecting tube 240 is embedded between the stop surface 2259 and the docking surface 2255. When the tube portion 225 is subjected to a force in the direction of separating from the connecting tube 240, the stop surface 2259 will resist against the inner wall of the connecting tube 240, preventing the tube portion 225 from separating from the connecting tube 240, thereby improving the reliability of the connection between the tube portion 225 and the connecting tube 240, thereby improving the reliability of the connection between the joint 220 and the connecting tube 240.

[0093] In one embodiment, there are at least two protrusions 2257, spaced apart along the axial direction of the fluid tube 130, with each protrusion 2257 corresponding to a guide surface 2258. This facilitates the connection between the connector 220 and the connecting tube 240 and improves the reliability of the connection between the connector 220 and the connecting tube 240. Portions of the connecting tube 240 are embedded between the abutting surface 2255 and the protrusion 2257, and between two adjacent protrusions 2257.

[0094] In this embodiment, there are two protrusions 2257, which are spaced apart along the axial direction of the fluid tube 130. Of course, in other embodiments of the present application, the number of the protrusions 2257 can also be one, three, or other numbers.

[0095] See also Figure 4 、 Figure 6 and Figure 10The blood pump 10 also includes a seal 600, which is disposed within the insertion groove 137. When the tube assembly 200 is docked with the fluid tube 130, the proximal end of the tube assembly 200 is inserted into the insertion groove 137 and abuts against the seal 600. Specifically, the docking end 2233 abuts against the seal 600. The seal 600 provides a seal between the connector 220 and the fluid tube 130, preventing blood flowing from the interior of the tube assembly 200 into the fluid tube 130 from leaking outside the blood pump 10 through the space between the outer circumferential surface of the second tube segment 135 and the second inner circumferential surface 2237, and between the first protrusion 131 and the second protrusion 221, thereby improving the safety of the blood pump 10. In the illustrated embodiment, since both the first protrusion 131 and the second protrusion 221 are single annular protrusions, blood does not leak between two adjacent first protrusions 131 or between two adjacent second protrusions 221, thereby enhancing the anti-leakage effect of the seal 600.

[0096] See also Figure 5 and Figure 8 The locking assembly 300 further includes a connecting arm 380 and a handle 390. The handle 390 is rotatably connected to the first end 330. The connecting arm 380 is rotatably connected to the handle 390 and can be connected to the second end 350. When the connecting arm 380 is connected to the second end 350, rotating the handle 390 can drive the connecting arm 380 to move, so that the second end 350 moves closer to or farther from the first end 330, thereby adjusting the inner diameters of the first ring body 320 and the second ring body 340, thereby enabling the locking assembly 300 to have a locked state and an unlocked state. For example, when the connecting arm 380 is connected to the second end 350 and the handle 390 is rotated toward the first ring body 320 or the second ring body 340, the second end 350 moves closer to the first end 330, causing the inner diameters of the first ring body 320 and the second ring body 340 to decrease, thereby placing the locking assembly 300 in a locked state. When the handle 390 is moved away from the first ring body 320 or the second ring body 340 , the second end 350 moves away from the first end 330 , so that the inner diameters of the first ring body 320 and the second ring body 340 increase, and the locking assembly 300 is in an unlocked state.

[0097] In other embodiments, the inner diameter of the locking assembly 300 is not adjustable. For example, the first ring body 320 is fixed to a fixed structure, and the second ring body 340 is rotatably connected to the fixed structure, so that the second ring body 340 can be closed or opened relative to the first ring body 320, and the first ring body 320 and the second ring body 340 are detachably connected. When the second ring body 340 is closed relative to the first ring body 320 and the first ring body 320 and the second ring body 340 are connected, the first protrusion 131 and the second protrusion 221 are engaged between the first ring body 320 and the second ring body 340. When the first ring body 320 and the second ring body 340 are separated, the second ring body 340 can be opened relative to the first ring body 320, and the first protrusion 131 and the second protrusion 221 can be disengaged from the first ring body 320 and the second ring body 340.

[0098] See also Figures 12 to 14 The blood pump 10 further includes a puncture head 700, which is provided with a liquid inlet channel 710. The puncture head 700 further includes a docking section 730 and a puncture section 750 away from the docking section 730. The docking section 730 is connected to the distal end of the tube assembly 200 so that the liquid inlet channel 710 is connected to the tube assembly 200. The puncture section 750 has a liquid inlet 752 connected to the liquid inlet channel 710, and an edge surrounding the liquid inlet 752. The liquid inlet 752 is opposite to the liquid inlet channel 710. The central axis L of the liquid inlet 752 is inclined, and the edge of the liquid inlet 752 has a first side 754 and a second side 756 away from the docking section 730. The first side 754 and the second side 756 are connected to define the liquid inlet 752. In this way, the end of the puncture section 750 facing away from the connecting tube 240 forms a tip, which facilitates the puncture section 750 to penetrate the heart (e.g., the atrium) by puncture, which can reduce the diameter of the opening in the heart, reduce the trauma of the opening, and reduce the difficulty of the operation. Specifically, the liquid inlet 752 is inclined relative to the central axis L of the liquid inlet channel 710, which means that the plane where the liquid inlet 752 is located is inclined relative to the central axis L of the liquid inlet channel 710, so that the puncture head 700 can penetrate the heart. Specifically, the liquid inlet channel 710 is connected to the connecting tube 240.

[0099] The second side portion 756 is located at the end of the liquid inlet 752 that is farthest from the docking section 730. That is, the second side portion 756 is disposed at the end of the puncture section 750 that is farthest from the connecting tube 240. The second side portion 756 is disposed on one side of the central axis L. Specifically, the two ends of the second side portion 756 are respectively connected to the two ends of the first side portion 754. That is, the second side portion 756 and the first side portion 754 are connected to jointly define the liquid inlet 752.

[0100] The radius of curvature of the second side 756 is greater than the radius of curvature of the first side 754 near the second side 756. Specifically, the second side 756 extends along an arc, and the radius of curvature of the second side 756 refers to the radius of curvature in the direction of extension of the arc. Accordingly, the radius of curvature of the first side 754 near the second side 756 refers to the radius of curvature of the section of the first side 754 near the second side 756 in the direction of extension. That is, the curvature of the second side 756 in the direction of extension is less than the curvature of the section of the first side 754 near the second side 756 in the direction of extension, resulting in a smoother curve. This shortens the length and sharpness of the puncture tip 700, avoids damage to cardiac septa caused by an overly sharp end of the puncture segment 750, and improves surgical safety.

[0101] In other embodiments, the second side 756 is perpendicular to the central axis L of the liquid inlet channel 710, that is, the extension direction of the second side 756 is a straight line. This can also shorten the length and sharpness of the puncture tip 700, avoid the situation where the end of the puncture section 750 is too sharp and causes damage to the cardiac septum, and improve the safety of the operation.

[0102] In this embodiment, the puncture head 700 can penetrate the left atrium to allow blood in the left atrium to enter the pump body 100 through the liquid inlet channel 710 and the tube assembly 200. In other embodiments, the puncture head 700 can also penetrate other locations of the heart (e.g., the right atrium, left ventricle, right ventricle) or other organs.

[0103] Puncture tip 700 is connected to connecting tube 240. The docking section 730 is the proximal end of puncture tip 700, and the puncture section 750 is the distal end of puncture tip 700. The docking section 730 is connected to connecting tube 240. Specifically, the docking section 730 is inserted into the distal end of connecting tube 240. Puncture tip 700 is hollow, and the hollow cavity serves as the liquid inlet channel 710.

[0104] The puncture section 750 can penetrate the heart. The puncture head 700 penetrates the heart through the puncture section 750 in a puncture manner, which can reduce the diameter of the heart opening, reduce the size of the heart opening wound, reduce the difficulty of the operation, and facilitate the operation.

[0105] The liquid inlet channel 710 is inclined relative to the central axis L. The liquid inlet channel 710 is generally elliptical and inclined relative to the central axis L. The first side portion 754 extends along a portion of an ellipse. Specifically, the radius of curvature of the second side portion 756 is greater than the radius of curvature of the first side portion 754. In the first side portion 754, the portion of the first side portion 754 opposite the second side portion 756 has the smallest radius of curvature. The first side portion 754 includes a first side segment 7541 and a second side segment 7543. One end of the first side segment 7541 is connected to one end of the second side segment 7543, and the two ends of the second side segment 756 are respectively connected to the end of the first side segment 7541 away from the second side segment 7543 and the end of the second side segment 7543 away from the first side segment 7541. In the first side portion 754, the radius of curvature at the connection between the first side segment 7541 and the second side segment 7543 is the smallest. That is, the connection between the first side segment 7541 and the second side segment 7543 is opposite to the second side portion 756. In the first side portion 754, the connection between the first side segment 7541 and the second side segment 7543 is closest to the connecting pipe 240. The first side segment 7541 and the second side segment 7543 are arranged in mirror symmetry.

[0106] See also Figures 13 to 16 The second side portion 756 has a first connecting segment 7561 and a second connecting segment 7563, which are respectively connected to the two ends of the first side portion 754; the first side portion 754 extends along a portion of an ellipse, and the angle between the extension direction of the first connecting segment 7561 and the extension direction of the first side portion 754 is equal to the angle between the extension direction of the second connecting segment 7563 and the extension direction of the first side portion 754. Figure 16 As shown in (a), the angle between the extension direction of the first connecting section 7561 and the extension direction of the first side portion 754 is defined as α1, and the angle between the extension direction of the second connecting section 7563 and the extension direction of the first side portion 754 is defined as α2, that is, α1 = α2. When the two angles α1 and α2 are equal, the angles of the two angles can be maximized. When the two angles are not equal, as shown in FIG. Figure 16 In the case shown in (b), α1 ' <α1, such as Figure 16 In the case shown in (c), α2 ' <α1, that is, in the latter two cases, one of the two included angles will form a relatively sharp angle, which can damage the cardiac septum. Thus, the included angle between the extension direction of the first connecting segment 7561 and the extension direction of the first side portion 754 is equal to the included angle between the extension direction of the second connecting segment 7563 and the extension direction of the first side portion 754. This can avoid the formation of an excessively sharp angle caused by the provision of the second side portion 756, thereby reducing the possibility of damage to the cardiac septum.

[0107] The outer wall of puncture tip 700 is provided with a groove 770, located between puncture section 750 and docking section 730. Groove 770 extends circumferentially around puncture tip 700 and is positioned around the axis of liquid inlet channel 710. In other words, groove 770 is an annular groove. Groove 770 can accommodate a purse-string suture that connects tissue to puncture tip 700. The purse-string suture can also be placed on the heart.

[0108] During the operation, the purse-string suture preset on the heart can be placed on the puncture head 700 and accommodated in the groove 770. That is, when the puncture head 700 is inserted into the heart, the purse-string suture can be placed in the position of the groove 770 of the puncture head 700, tightened, and accommodated in the groove 770. The purse-string suture is sealed with the bottom of the groove 770 to achieve a sealed connection between the puncture head 700 and the heart, and the puncture head 700 is fixed to the heart.

[0109] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned 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.

[0110] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A blood pump, characterized in that: include: A pump body, the pump body comprising a pump housing and a fluid pipe connected to the pump housing, the fluid pipe communicating with an inner cavity of the pump housing, and a first protrusion being provided on an outer circumference of the fluid pipe; a pipe assembly capable of docking with the fluid pipe, wherein a second protrusion is provided on the outer periphery of the pipe assembly; as well as A locking assembly is capable of engaging with the first protrusion and the second protrusion to fix the tube assembly to the fluid tube.

2. The blood pump according to claim 1, wherein The locking assembly includes a first ring body and a second ring body that are connected, and the first ring body and the second ring body are arranged at intervals along the axial direction of the first ring body. A locking groove that can engage with the first protrusion and the second protrusion is formed between the first ring body and the second ring body, wherein the first protrusion and the second protrusion are both engaged with the locking groove to at least prevent the tube assembly and the fluid tube from separating in the axial direction of the fluid tube.

3. The blood pump according to claim 2, characterized in that When the tube assembly is docked with the fluid tube, the first protrusion abuts against the second protrusion in the axial direction of the fluid tube, the first ring abuts against a side of the first protrusion away from the second protrusion, and the second ring abuts against a side of the second protrusion away from the first protrusion; Alternatively, there are multiple first protrusions, and the multiple first protrusions are arranged at intervals along the circumference of the fluid pipe; there are multiple second protrusions, and the multiple second protrusions are arranged at intervals along the circumference of the pipe assembly; when the pipe assembly is docked with the fluid pipe, there is a second protrusion between every two adjacent first protrusions, and the first ring body and the second ring body respectively abut against two opposite surfaces of the first protrusion along the axial direction of the fluid pipe, and the first ring body and the second ring body respectively abut against two opposite surfaces of the second protrusion along the axial direction of the pipe assembly.

4. The blood pump according to claim 2, characterized in that The first protrusion is an annular protrusion provided on the fluid pipe, and the second protrusion is an annular protrusion provided on the pipe assembly. When the pipe assembly is docked with the fluid pipe, the first protrusion and the second protrusion abut against each other in the axial direction of the fluid pipe, the first ring body abuts against a side of the first protrusion away from the second protrusion, and the second ring body abuts against a side of the second protrusion away from the first protrusion.

5. The blood pump according to claim 2, characterized in that The first ring body can be tightly sleeved on the outer circumference of the fluid pipe, and the second ring body can be tightly sleeved on the outer circumference of the pipe assembly, so that the first ring body and the second ring body can prevent the pipe assembly from rotating relative to the fluid pipe.

6. The blood pump according to claim 5, characterized in that The first ring body includes a first ring body and a plurality of first abutment protrusions arranged on the inner wall of the first ring body, and the plurality of first abutment protrusions are spaced along the circumference of the first ring body; the second ring body includes a second ring body and a plurality of second abutment protrusions arranged on the inner wall of the second ring body, and the plurality of second abutment protrusions are spaced along the circumference of the second ring body, and the engaging groove is formed between the first abutment protrusion and the second abutment protrusion; the end face of the first abutment protrusion away from the first ring body is a first locking surface, and when the first ring body is tightly sleeved on the outer circumference of the fluid pipe, the first locking surface abuts against the outer circumferential surface of the fluid pipe; the end face of the second abutment protrusion away from the second ring body is a second locking surface, and when the second ring body is tightly sleeved on the outer circumference of the pipe assembly, the second locking surface abuts against the outer circumferential surface of the pipe assembly.

7. The blood pump according to claim 2, characterized in that A first guide surface is formed at one end of the first protrusion away from the fluid pipe, and a distance from the first guide surface to the central axis of the fluid pipe gradually increases in a direction away from the pump housing; A second guide surface is formed at an end of the second protrusion away from the pipe assembly, the pipe assembly having a butt end for butting against the fluid pipe, and a distance from the second guide surface to the central axis of the pipe assembly gradually increases in a direction approaching the butt end; The first ring body includes a first ring body and a plurality of first abutment protrusions arranged on the inner wall of the first ring body, the first ring body is an open ring so that the inner diameter of the first ring body can be adjusted, and the plurality of first abutment protrusions are spaced along the circumference of the first ring body, the second ring body includes a second ring body and a plurality of second abutment protrusions arranged on the inner wall of the second ring body, the second ring body is an open ring so that the inner diameter of the second ring body can be adjusted, and the plurality of second abutment protrusions are spaced along the circumference of the second ring body, and the engaging groove is formed between the first abutment protrusion and the second abutment protrusion; when adjusting the inner diameters of the first ring body and the second ring body, the first abutment protrusion can slide along the first guide surface, and the second abutment protrusion can slide along the second guide surface.

8. The blood pump according to claim 7, characterized in that The first guide surface and the second guide surface are both convex arc surfaces; And / or, a first sliding surface is formed on the end of the first abutting protrusion away from the first ring body, and the first sliding surface is an outwardly convex arc surface; a second sliding surface is formed on the end surface of the second abutting protrusion away from the second ring body, and the second sliding surface is an outwardly convex arc surface; when the inner diameters of the first ring body and the second ring body are adjusted, the first sliding surface can slide along the first guide surface, and the second sliding surface can slide along the second guide surface.

9. The blood pump according to claim 7, characterized in that The first guide surface has a first side close to the pump housing and a second side away from the pump housing, and the second guide surface has a third side close to the butt end of the pipe assembly and a fourth side away from the butt end; When the first protrusion and the second protrusion are both engaged with the engaging groove, the first abutting protrusion abuts against the first guide surface, and the second abutting protrusion abuts against the second guide surface. The first abutting protrusion abuts against a first position of the first guide surface, and the first position is located between the first side and the second side. The second abutting protrusion abuts against a second position of the second guide surface, and the second position is located between the third side and the fourth side.

10. The blood pump according to claim 1, wherein A plug-in groove for the proximal end of the tube assembly to be plugged in is formed between the first protrusion and the outer peripheral surface of the fluid tube. The blood pump also includes a sealing member, which is arranged in the plug-in groove. When the tube assembly is docked with the fluid tube, the proximal end of the tube assembly is plugged into the plug-in groove and abuts against the sealing member.

11. The blood pump according to claim 1, wherein The locking assembly includes a first ring body, a second ring body, a connecting arm and a handle. The first ring body and the second ring body are both open rings. The first ring body has a first head end and a first tail end that are opposite and spaced apart. The second ring body has a second head end and a second tail end that are opposite and spaced apart. The first head end and the second head end are connected to form a first end, and the first tail end and the second tail end are connected to form a second end. The first end and the second end are spaced apart to form an opening. The handle is rotatably connected to the first end, and the connecting arm is rotatably connected to the handle. The connecting arm can be connected to the second end. When the connecting arm is connected to the second end, rotating the handle can drive the connecting arm to move so that the second end is close to or away from the first end to adjust the inner diameter of the first ring body and the second ring body.

12. The blood pump according to any one of claims 1 to 11, characterized in that: The blood pump also includes a puncture head, which is provided with a liquid inlet channel. The puncture head also has a docking section and a puncture section away from the docking section. The docking section is connected to the distal end of the tube assembly to connect the liquid inlet channel with the tube assembly. The puncture section has a liquid inlet connected to the liquid inlet channel, and an edge surrounding the liquid inlet. The liquid inlet is inclined relative to the central axis of the liquid inlet channel. The edge of the liquid inlet has a first edge and a second edge away from the docking section. The first edge and the second edge are connected to define the liquid inlet, wherein: the curvature radius of the second edge is greater than the curvature radius of the first edge close to the second edge, or the second edge is perpendicular to the central axis of the liquid inlet channel.

13. The blood pump according to claim 12, characterized in that The second side portion has a first connecting segment and a second connecting segment, the first connecting segment and the second connecting segment are respectively connected to the two ends of the first side portion; the first side portion extends along a part of an ellipse, and the angle between the extension direction of the first connecting segment and the extension direction of the first side portion is equal to the angle between the extension direction of the second connecting segment and the extension direction of the first side portion.

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