Outlet tube and blood pump

Abstract

Provided are an outlet tube (100) and a blood pump (10). The outlet tube (100) has an inner wall surface (110), an outer wall surface (120), and an outlet hole (130). The outlet hole (130) penetrates through the inner wall surface (110) and the outer wall surface (120). A hole wall (131) defining the outlet hole (130) is formed around the circumference of the outlet hole (130). The hole wall (131) comprises a wide inclined surface (1311), and the wide inclined surface (1311) is inclined relative to both the outer wall surface (120) and the inner wall surface (110). In a direction from an outer side of the outlet hole (130) along a radial direction of the outlet tube (100) to an inner side of the outlet hole (130), the wide inclined surface (1311) is shielded by the outer wall surface (120). The wide inclined surface (1311) has an extension width extending along its inclination direction, and the extension width is not less than 0.6 times the wall thickness of the outlet tube (100).

Description

Outlet tube and blood pump

[0001] This application claims priority to the Chinese patent application No. 202510188643.1 filed on February 20, 2025 in the China Patent Office, the whole content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of medical devices, in particular to an outlet tube and a blood pump. BACKGROUND

[0003] A blood pump is a mechanical circulation support device that directly pumps blood from the venous system or the heart into the arterial system, partially or completely replacing the function of the ventricle. When the blood pump is working, the blood pump drives the patient's blood to enter the blood pump first, then the blood is accelerated by the impeller in the blood pump, and finally discharged from the outlet of the blood pump. However, the resistance of the blood discharged from the outlet of the blood pump is large, resulting in low blood pumping efficiency of the blood pump. SUMMARY

[0004] Therefore, the present application provides an outlet tube and a blood pump to solve the problem of low blood pumping efficiency of the existing blood pump.

[0005] The present application provides an outlet tube, which is applied to a blood pump for percutaneous intervention into a patient's body, the outlet tube having:

[0006] an inner wall surface;

[0007] an outer wall surface located at the outer periphery of the inner wall surface; the outlet tube has a tube wall thickness between the inner wall surface and the outer wall surface; and

[0008] an outlet hole penetrating through the inner wall surface and the outer wall surface, the circumference of the outlet hole forming a hole wall defining the outlet hole; the hole wall includes a broad inclined surface, which is inclined relative to the outer wall surface and the inner wall surface;

[0009] The broad inclined surface is blocked by the outer wall surface in the direction from the outside of the outlet hole to the inside of the outlet hole along the radial direction of the outlet tube; the broad inclined surface has an extension width extending along the inclined direction thereof, and the extension width is not less than 0.6 times the tube wall thickness.

[0010] The present application also provides a blood pump, which includes an impeller and an outlet tube as described above; the impeller is rotatably arranged in the outlet tube.

[0011] The outlet pipe and the blood pump can guide the blood to flow out of the outlet hole by the wide slope, reduce the resistance of the blood flow, and facilitate the blood flow.

[0012] In particular, when the blood pump is pushed into the patient's body, the outer surface of the outlet pipe is more likely to contact the inner wall of the tissue, so the outer surface of the existing outlet pipe is not smooth and needs to be deburred and processed, and the processing precision is higher and the manufacturing difficulty is greater. In the present application, the wide slope is hidden inside the outlet pipe and is less likely to contact and rub the inner wall of the tissue, so the deburring and processing precision can be appropriately reduced during manufacturing. In addition, the outer surface of the outlet pipe is a smooth cylindrical surface and is not affected by the wide slope, so there are fewer burrs during the forming process, thereby effectively reducing the manufacturing difficulty.

[0013] The details of one or more embodiments of the application are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of the application will be apparent from the description and drawings, and from the claims. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0015] FIG. 1 is a structural schematic view of a proximal end portion of a blood pump according to an embodiment of the present application.

[0016] FIG. 2 is a flow schematic view of blood in the outlet pipe of the blood pump provided in FIG. 1.

[0017] FIG. 3 is a structural schematic view of the outlet pipe of the blood pump provided in FIG. 1 from a first angle.

[0018] Fig. 4 is a schematic view of the outlet tube of the blood pump of Fig. 1 from a second angle.

[0019] Fig. 5 is a cross-sectional view of the outlet tube of Fig. 4 in the direction of A-A.

[0020] Fig. 6 is a cross-sectional view of the outlet tube of Fig. 4 in the direction of B-B.

[0021] Fig. 7 is a schematic view of a distal portion of a blood pump according to an embodiment of the application.

[0022] Fig. 8, Fig. 9 and Fig. 10 are each a zoomed-in view of the detail D of Fig. 6.

[0023] Fig. 11 is a zoomed-in view of the detail C of Fig. 5.

[0024] Fig. 12 is a longitudinal cross-sectional view of the blood pump of Fig. 1.

[0025] Fig. 13 is a zoomed-in view of the detail E of Fig. 12.

[0026] Fig. 14 is a top view of the blood pump of Fig. 1.

[0027] Fig. 15 is a schematic view of the blood pump of Fig. 12 arranged on a guide wire.

[0028] Fig. 16 is a zoomed-in view of the detail F of Fig. 15. 10, blood pump; 100, outlet tube; 110, inner wall surface; 120, outer wall surface; 130, outlet aperture; 131, aperture wall; 1311, broad bevel; 131a, side broad bevel; 131b, distal broad bevel; 132, first rounded corner; 133, second rounded corner; 134, third rounded corner; 135, fourth rounded corner; 140, main tube body; 160, connecting column; 161, first surface; 162, second surface; 170, clearance; 101, central axis; 102, intersection line; 103, first plane; 104, second plane; 105, blood flow channel; 106, third plane; 200, motor; 210, housing; 211, main housing; 212, distal cap; 212a, outer peripheral surface; 212b, top surface; 212c, arc convex surface; 213, proximal cap; 220, stator; 230, rotor; 240, rotation shaft; 300, impeller; 310, hub; 320, blade; 321, outer edge; 321a, distal segment; 321b, proximal segment; 400, catheter; 500, cannula; 600, inlet tube; 610, inlet aperture; 700, guide wire; 710, curved portion; 720, portion outside the outlet aperture. DETAILED DESCRIPTION

[0029] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0030] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0031] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0032] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0033] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0034] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, 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 possible implementation.

[0035] It should be noted that the terms "distal" and "proximal" in the text are only used to indicate relative positional relationships. The "distal" end of a component refers to the end that enters the patient's body first and / or is farther away from the operator during normal operation, while the "proximal" end refers to the end that enters the patient's body later and / or is closer to the operator.

[0036] A blood pump, also known as a percutaneous transcatheter blood pump, is used to deliver blood from a blood vessel into the ventricle of the heart to assist the heart in pumping blood from the ventricle into the arteries, thus supporting the patient's blood circulation. When the blood pump is working, it drives the patient's blood to enter the pump through the inlet, then flows axially along the pump's axis, and finally exits radially from the pump's outlet, thus achieving blood circulation. However, when the blood exits the pump, it must change from axial to radial flow. This change in blood flow direction results in significant loss of kinetic energy, increasing the difficulty of exiting the pump and leading to lower pumping efficiency.

[0037] In this application, one embodiment provides an outlet tube and a blood pump. The outlet tube can be applied to the blood pump to support the patient's blood circulation. The blood pump 10 can be the left ventricular interventional pump shown in Figure 1. Of course, it can be used as a right ventricular interventional pump in other embodiments. In the accompanying drawings of this application, arrow Y+ indicates the direction from proximal to distal, and arrow Y- indicates the direction from distal to proximal; the dashed arrows in Figure 2 represent a schematic diagram of blood flow in the outlet tube 100 of the left ventricular interventional pump.

[0038] As shown in Figures 1 to 3, the blood pump 10 includes an outlet pipe 100, which has an inner wall surface 110, an outer wall surface 120, and an outlet hole 130. The inner wall surface 110 surrounds a blood flow channel 105; the outer wall surface 120 is located on the outer periphery of the inner wall surface 110; and the outlet hole 130 penetrates the inner wall surface 110 and the outer wall surface 120. When the blood pump 10 is working, blood flows through the blood flow channel 105 of the outlet pipe 100 and is discharged outward through the outlet hole 130.

[0039] As shown in Figures 3 to 6, multiple outlet holes 130 are provided, and the multiple outlet holes 130 are arranged at intervals along the circumference of the outlet pipe 100. Optionally, the multiple outlet holes 130 are evenly spaced along the circumference of the outlet pipe 100. By evenly arranging the multiple outlet holes 130, it can be ensured that blood is evenly discharged from the outlet pipe 100 along its circumference. The number of outlet holes 130 can be 2, 3, 4, 5, 6 or more, without specific limitation, as long as it does not affect the strength of the outlet pipe 100 and the smooth discharge of blood.

[0040] The blood pump 10 also includes an impeller 300, which is rotatably disposed in a blood flow channel 105 within an outlet pipe 100. By driving the impeller 300 to rotate, blood can flow through the blood flow channel 105 of the outlet pipe 100 and be discharged outward through an outlet hole 130. The impeller 300 includes a hub 310 and a plurality of blades 320 disposed on the hub 310. The number of blades 320 can be two, three, or four.

[0041] The blood pump 10 also includes a motor 200, the distal end of which is fixedly connected to the proximal end of the outlet tube 100. The motor 200 is also fixedly connected to the impeller 300, so that the impeller 300 is driven to rotate by the motor 200. In this embodiment, the motor 200 is an in vivo motor, which can be pushed into the blood vessel along with the outlet tube 100. In other embodiments, the motor 200 can also be an external motor, that is, the motor 200 is placed outside the body, and the motor 200 is connected to the impeller 300 through a flexible shaft, so that the motor 200 drives the impeller 300 to rotate through the flexible shaft.

[0042] The blood pump 10 also includes a catheter 400, the distal end of which is connected and fixed to the proximal end of the motor 200. The catheter 400 has an inner lumen that can accommodate a flushing tube, sensor fiber optic cable, or wires of the motor 200. In other embodiments, when the motor 200 is an external motor, the flexible shaft connecting the motor 200 and the impeller 300 can also extend through the inner lumen of the catheter 400.

[0043] In some embodiments, a hole wall 131 defining the outlet hole 130 is formed around the circumference of the outlet hole 130. The hole wall 131 includes a broad bevel 1311, which is inclined relative to both the outer wall surface 120 and the inner wall surface 110. From the outside of the outlet hole 130 along the radial direction of the outlet pipe 100 to the inside of the outlet hole 130 (i.e., the direction shown by arrow S in FIG. 6), the broad bevel 1311 is obscured by the outer wall surface 120. In simpler terms, when looking through the outlet hole 130 from the outside of the outlet pipe 100 towards the inside of the outlet pipe 100 along the radial direction of the outlet pipe 100, the broad bevel 1311 is obscured by the outer wall surface 120, thus making the broad bevel 1311 invisible and hidden inside the outlet pipe 100.

[0044] By setting at least a portion of the orifice wall 131 of the outlet orifice 130 as a broad slope 1311, the broad slope 1311 is inclined relative to both the outer wall surface 120 and the inner wall surface 110. From the outside of the outlet orifice 130 along the radial direction of the outlet pipe 100 to the inside of the outlet orifice 130, the broad slope 1311 is blocked by the outer wall surface 120. The broad slope 1311 can be used to guide blood out of the blood flow channel 101, reduce the resistance to blood outflow, and facilitate blood outflow.

[0045] As shown in Figure 8, the outlet pipe 100 also has a pipe wall thickness H located between the inner wall surface 110 and the outer wall surface 120; the wide inclined surface 1311 has an extension width L extending along its own inclined direction, and the extension width L is not less than 0.6 times the pipe wall thickness H, that is, L≥0.6H, for example L=0.6H, L=0.7H, L=0.8H, L=0.9H, L=1.0H, L=1.1H, L=1.2H, L=1.3H, L=1.4H, etc. By setting the relationship between the extension width L of the wide inclined surface 1311 and the wall thickness H of the outlet pipe 100 in this way, the width of the wide inclined surface 1311 can be large, making it a large inclined surface. In other words, a large inclined surface is formed on the inner side of the outlet hole 130. Thus, the inner side of the outlet hole 130 has a large inclined area, which can fully guide the blood to gradually switch from axial flow along the wide inclined surface 1311 of the outlet hole 130 to radial flow. This reduces the resistance and kinetic energy loss of the blood during the entire process of blood being discharged from the outlet hole 130, resulting in high discharge efficiency and improving the pumping efficiency of the blood pump 10.

[0046] Specifically, when the blood pump 10 is pushed into the patient's body, the outer surface of the outlet tube 100 is more likely to come into contact with the inner wall of the tissue. Therefore, existing outlet tubes with rough outer surfaces require deburring and other processing, which demands higher precision and is more difficult to manufacture. In this application, since the large bevel (i.e., the broad bevel 1311) is hidden inside the outlet tube 100, it is less likely to come into contact with and rub against the inner wall of the tissue. Thus, the precision required for deburring and other processing during manufacturing can be slightly reduced. Furthermore, the outer surface of the outlet tube 100 is a smooth cylindrical surface, unaffected by the broad bevel 1311, resulting in fewer burrs generated during the forming process, thereby effectively reducing manufacturing difficulty.

[0047] It is understandable that the extension width L of the wide slope 1311 cannot be increased indiscriminately to increase the area of ​​the wide slope of the outlet hole 130. If the extension width L of the wide slope 1311 is too large, as shown in Figure 8, it may reduce the cross-sectional area of ​​the part between two adjacent outlet holes 130 in the outlet pipe 100 (i.e., the connecting post 160 mentioned below), which may weaken the strength of the connecting post 160 of the outlet pipe 100. Therefore, this application also limits the maximum value of the extension width L of the wide slope 1311, specifically, L≤1.3H. Preferably, 0.8H≤L≤1.1H. The extension width L of the wide slope 1311 within this range can effectively guide the flow direction of blood, avoid excessive kinetic energy loss, and effectively ensure the strength of the outlet pipe 100. In addition, it can also prevent the connection between the wide slope 1311 and the outer wall surface 120 of the outlet pipe 100 from being too sharp. It should be noted that the thick dashed line in Figure 8 represents a wide sloping surface 1311 with a relatively large extension width L.

[0048] When designing the blood pump 10, the wall thickness H of the outlet tube 100 also needs to be limited. Specifically, the wall thickness H can be set to 0.15mm to 0.3mm, for example, H can be 0.15mm, 0.17mm, 0.18mm, 0.19mm, 0.21mm, 0.23mm, 0.25mm, 0.27mm, 0.3mm, etc. If the wall thickness H of the outlet tube 100 is too small, the extension width L of the broad slope 1311 will be small, resulting in a small broad slope area of ​​the outlet hole 130. This will not be able to fully guide the blood from axial flow along the broad slope 1311 of the outlet hole 130 to gradually switch to radial flow, and will not effectively improve the pumping efficiency of the blood pump 10. If the wall thickness H of the outlet tube 100 is too large, the overall radial dimension of the blood pump 10 will be too large, which will increase the difficulty of the blood pump 10 in delivering blood into the patient's body.

[0049] As shown in Figures 12 to 16, when the guidewire 700 is used to assist the blood pump 10 in pushing the blood to the target location inside the patient's body, after the guidewire 700 enters the blood flow channel 105 of the outlet tube 100, the guidewire 700 generally passes through the blade gap between the two blades 320 of the impeller 300, and then bends radially outward at a position near the distal end of the outlet hole 130 to exit through the outlet hole 130. The portion 720 of the guidewire 700 located outside the outlet hole 130 extends outside the body close to the outer surface of the motor 200. The bent portion 710 of the guidewire 700 may come into contact with the distal end of the outlet hole 130 and wear down.

[0050] In view of this, to reduce the occurrence of the above-mentioned situation, in some embodiments of this application, the wide bevel 1311 includes at least a distal wide bevel 131b, which is located at the distal end of the outlet hole 130. Due to the presence of the distal wide bevel 131b, when the guidewire 700 passes through the outlet hole 130, the distal wide bevel 131b of the outlet hole 130 can avoid the curved portion 710 of the guidewire 700 (see Figures 15 and 16), and the curved portion 710 of the guidewire 700 is less likely to contact the distal wide bevel 131b, thereby reducing the contact friction between the guidewire 700 and the distal end of the outlet hole 130 and preventing the curved portion 710 of the guidewire 700 from being worn. When the blood pump 10 is pushed, the blood pump 10 moves relative to the guidewire 700 in the Y+ direction, and even if the connection between the distal wide bevel 131b and the outer wall surface 120 is relatively thin, it is not easy to scratch the guidewire 700.

[0051] Furthermore, when blood flows in the blood flow channel 105 of the outlet pipe 100 along the Y-direction, when the blood approaches the distal end of the outlet hole 130, the blood first comes into contact with the distal broad slope 131b, so that most of the blood can be guided out of the outlet hole 130 along the inclined direction of the distal broad slope 131b.

[0052] Referring to Figures 12 to 14, optionally, the blades 320 of the impeller 300 have an outer edge 321, which includes a connected distal segment 321a and a proximal segment 321b. The distal segment 321a is radially spaced from the inner wall surface 110 by a first distance K1. The presence of the first distance K1 allows the impeller 300 to rotate stably within the blood flow channel 105 without contacting or interfering with the inner wall surface 110. The outer edge 321 of the blade 320 is an arcuate shape extending circumferentially from the proximal end to the distal end of the impeller 300 around the hub 310, such as an exponentially gradient arcuate shape or a Bézier curve arcuate shape.

[0053] Furthermore, the proximal segment 321b of the outer edge 321 is radially opposite to the outlet hole 130. A portion of the proximal segment 321b is radially opposite to the distal broad bevel 131b, and is radially spaced by a second distance K2 along the outlet tube 100; the second distance K2 is greater than the first distance K1, i.e., K2 > K1. During the pushing of the blood pump 10, relative movement may occur between the guidewire 700 and the outlet tube 100. When the guidewire 700 moves into the space between the proximal segment 321b and the distal broad bevel 131b of the blade 320, due to the larger second distance K2, the guidewire 700 is less likely to be clamped or stuck by the proximal segment 321b and the distal broad bevel 131b, and the guidewire 700 can more easily move out of the space between the proximal segment 321b and the distal broad bevel 131b, ensuring that the blood pump 10 can be smoothly pushed to the target position along the guidewire 700.

[0054] The second spacing K2 gradually increases along the direction from the distal end to the proximal end of the outlet tube 100. At this time, the minimum value of the second spacing K2 on the side of the distal broad bevel 131b near the inner wall surface 110 is greater than the first spacing K1. This arrangement not only prevents the guidewire 700 from being clamped and stuck by the proximal segment 321b and the distal broad bevel 131b, but also facilitates the impeller 300 in driving the blood to drain quickly.

[0055] As shown in Figure 3, the broad slope 1311 also includes a side broad slope 131a; the side broad slope 131a extends along the axial direction of the outlet pipe 100 and is located on one side of the outlet hole 110, with the distal end of the side broad slope 131a smoothly connected to one end of the distal broad slope 131b. The smooth connection between the distal end of the side broad slope 131a and one end of the distal broad slope 131b means that no angle or sharp angle is formed at the connection point, making the connection between the side broad slope 131a and the distal broad slope 131b smooth. The side broad slope 131a is an inclined plane. Optionally, two lateral inclined surfaces 131a are provided, arranged at intervals along the circumference of the outlet pipe 100 on both sides of the outlet hole 130; the distal ends of the two lateral inclined surfaces 131a are respectively connected to the two ends of the distal inclined surface 131b. This arrangement of the inclined surfaces 1311 maximizes the area of ​​the outlet hole 130, effectively guiding blood to gradually switch from axial flow along the inclined surface 1311 of the outlet hole 130 to radial flow, minimizing resistance throughout the entire process of blood discharge from the outlet hole 130, and effectively improving the pumping efficiency of the blood pump 10.

[0056] It is understandable that there may be only one of the lateral broad slope 131a and the distal broad slope 131b.

[0057] As shown in Figures 5, 10, and 11, the lateral slope 131a intersects the inner wall surface 110 of the outlet pipe 100, forming an intersection line 102. The plane containing the intersection line 102 and the central axis 101 of the outlet pipe 100 is a first plane 103, and the lateral slope 131a and the first plane 103 have a first inclination angle α. It is considered that if the first inclination angle α is too small, the area of ​​the lateral slope 131a may be too small, failing to adequately guide blood from axial flow along the lateral slope 1311 of the outlet hole 130 to gradually switch to radial flow. If the first inclination angle α is too large, the connection between the lateral slope 131a and the outer wall surface 120 of the outlet pipe 100 may be too sharp. Therefore, the size of the first tilt angle α was studied and designed, and it was found that when the first tilt angle α is set to 35° to 65°, the area of ​​the side slope 131a can be larger; at the same time, it ensures that the connection between the side slope 131a and the outer wall surface 120 of the outlet pipe 100 is not too thin, thus reducing the occurrence of brittle fracture. The first tilt angle α can be specifically set to 35°, 40°, 45°, 55°, 60°, 65°, etc.

[0058] As shown in Figures 5 and 11, the plane perpendicular to the central axis 101 of the outlet tube 100 is the second plane 104, and the distal broad bevel 131b has a second inclination angle β with the second plane 104. It is considered that if the second inclination angle β is too small, the area of ​​the distal broad bevel 131b may be too small, failing to adequately guide blood from axial flow along the broad bevel 1311 of the outlet hole 130 to gradually switch to radial flow. If the second inclination angle β is too large, the connection between the distal broad bevel 131b and the outer wall surface 120 of the outlet tube 100 may be too thin, potentially causing scratching of the guidewire 700 (as shown in Figures 15 and 16). Therefore, the size of the second tilt angle β was studied and designed, and it was found that when the second tilt angle β is set to 35° to 65°, the area of ​​the distal broad slope 131b can be larger; at the same time, it ensures that the connection between the distal broad slope 131b and the outer wall surface 120 of the outlet pipe 100 is not too thin, which can greatly reduce the occurrence of scraping against the guide wire 700. The second tilt angle β can be specifically set to 35°, 40°, 45°, 55°, 60°, 65°, etc. Of course, in some other embodiments, only the first tilt angle α or the second tilt angle β is set to 35° to 65°.

[0059] As shown in Figure 3, the distal broad slope 131b is designed to be concave and arc-shaped relative to the distal end facing the outlet tube 100. This allows for a smooth transition between the two ends of the distal broad slope 131b and the distal ends of the two lateral broad slopes 131a. This avoids stress concentration at the connection between the distal broad slope 131b and the lateral broad slopes 131a, thus preventing the outlet tube 100 from cracking under blood flow, and also avoids dead angles at the connection between the distal broad slope 131b and the lateral broad slopes 131a, facilitating blood drainage.

[0060] When the outlet pipe 100 is manufactured using a one-piece molding method, the distal wide slope 131b is a concave arc surface with a certain curvature, which makes the molding of the distal wide slope 131b quite difficult. In view of this, this application reduces the molding difficulty of the distal wide slope 131b by reducing the second inclination angle β. Specifically, the second inclination angle β is smaller than the first inclination angle α, that is, β < α. By setting the second inclination angle β of the distal wide slope 131b to be smaller than the first inclination angle α of the side wide slope 131a, not only can the molding difficulty of the distal wide slope 131b be reduced, facilitating the processing and production of the outlet pipe 100, but it can also avoid the connection between the distal wide slope 131b and the outer wall surface 120 of the outlet pipe 100 being too sharp, thereby reducing the friction of the connection between the distal wide slope 131b and the outer wall surface 120 of the outlet pipe 100 on the guide wire 700.

[0061] Preferably, α is set to 35°–50°, for example, 35°, 36°, 37°, 38°, 39°, 40°, 41°, 42°, 43°, 44°, 45°, 46°, 47°, 48°, 49°, 50°, etc.; β is set to 45°–60°, for example, 45°, 46°, 47°, 48°, 49°, 50°, 51°, 52°, 53°, 54°, 55°, 56°, 57°, 58°, 59°, 60°, etc. Setting the values ​​of α and β in this way ensures that, under the premise that β < α, the area of ​​the lateral broad slope 131a and the distal broad slope 131b is maximized, and the probability of hemolysis is effectively reduced.

[0062] Since the axial dimension of the outlet pipe 100 is relatively large, and the side-wide slope 131a extends along the axial direction of the outlet pipe 100, the wide slope area of ​​the outlet hole 130 can be effectively increased by increasing the size of the side-wide slope 131a. Specifically, in some embodiments of this application, the extension width of the side-wide slope 131a is a first extension width L1, and the extension width of the distal wide slope 131b is a second extension width L2, where L1 > L2. By setting the first extension width L1 of the side-wide slope 131a to be larger than the second extension width L2 of the distal wide slope 131b, the area of ​​the side-wide slope 131a can be increased. As shown in Figure 10, 0.7H ≤ L1 ≤ 1.3H, preferably 0.8H ≤ L1 ≤ 1.1H; as shown in Figure 11, 0.7H ≤ L2 ≤ 1.3H, preferably 0.8H ≤ L2 ≤ 1.1H.

[0063] In some embodiments of this application, the wide slope 131 has an inner edge and an outer edge, the inner edge being connected to the inner wall surface 110 and the outer edge being connected to the outer wall surface 120; wherein, the connection between the inner edge and the inner wall surface 110 and the connection between the outer edge and the outer wall surface 120 are both provided with rounded corners. The rounded corners can prevent the connection between the inner edge and the inner wall surface 110, and the connection between the outer edge and the outer wall surface 120, from being too sharp, thus reducing the probability of hemolysis. Of course, in other embodiments, only the connection between the inner edge and the inner wall surface 110 or the connection between the outer edge and the outer wall surface 120 is provided with rounded corners.

[0064] Specifically, as shown in Figure 10, the lateral slope 131a has a first inner edge adjacent to the inner wall surface 110, and a first rounded corner 132 is provided at the connection between the first inner edge and the inner wall surface 110 of the outlet pipe 100. The first rounded corner 132 can prevent the connection between the lateral slope 131a and the inner wall surface 110 of the outlet pipe 100 from being too sharp, thereby reducing the probability of hemolysis.

[0065] The lateral slope 131a also has a first outer edge adjacent to the outer wall surface 120, and a second rounded corner 133 is provided at the connection between the first outer edge and the outer wall surface 120 of the outlet pipe 100. The second rounded corner 133 can prevent the connection between the lateral slope 131a and the outer wall surface 120 of the outlet pipe 100 from being too sharp, which can avoid injury to the patient and reduce the probability of hemolysis.

[0066] As shown in Figure 11, the distal broad bevel 131b has a second inner edge adjacent to the inner wall surface 110, and a third rounded corner 134 is provided at the connection between the second inner edge and the inner wall surface 110 of the outlet pipe 100. The third rounded corner 134 can prevent the connection between the distal broad bevel 131b and the inner wall surface 110 of the outlet pipe 100 from being too sharp, thereby reducing the probability of hemolysis.

[0067] The distal broad bevel 131b also has a second outer edge adjacent to the outer wall surface 120, and a fourth rounded corner 135 is provided at the connection between the second outer edge and the outer wall surface 120 of the outlet tube 100. The fourth rounded corner 135 can prevent the connection between the fourth broad bevel 131b and the outer wall surface 120 of the outlet tube 100 from being too sharp, thus avoiding injury to the patient and preventing wear on the guidewire 700.

[0068] In some embodiments of this application, as shown in FIG3, a connecting post 160 is formed between every two adjacent outlet holes 130 in the outlet pipe 100; as shown in FIG10, the connecting post 160 has a first surface 161, a second surface 162, and two lateral slopes 131a. The first surface 161 faces the central axis 101 of the outlet pipe 100, the second surface 162 faces away from the first surface 161, and the lateral slopes 131a connect the first surface 161 and the second surface 162; the width of the connecting post 160 along the circumference of the outlet pipe 100 gradually decreases from the second surface 162 to the first surface 161. This variation in the width of the connecting post 160 along the circumference of the outlet pipe 100 allows the width W of the outlet hole 130 along the circumference of the outlet pipe 100 to gradually increase in the direction close to the central axis of the outlet pipe 100 (see FIG6), that is, the size of the outlet hole 130 follows a pattern of being larger inside and smaller outside, which can better guide the blood outflow and improve the blood outflow efficiency.

[0069] As shown in Figure 8, the connecting post 160 has a minimum width L on the first surface 161. min Then, L min <L1, for example L min＝ 0.9L1, L min =0.8L1, L min =0.7L1, L min =0.6L1, L min =0.5L1 etc. The first extension width L1 of the side slope 131a is set to be greater than the minimum width L of the connecting column 160. min This can increase the first extension width L1 of the lateral slope 131a, thereby increasing the lateral slope area of ​​the outlet hole 130 and improving the blood discharge efficiency.

[0070] As shown in Figure 8, the connecting post 160 has a maximum width L on the second surface 162. max Then L max >2H, for example, L max =2.1H, L max =2.2H, L max =2.3H, L max =2.4H, L max=2.5H, etc. The maximum width L of the connecting post 160 is thus limited. max The relationship between the wall thickness H of the outlet pipe 100 and the inclination angle of the lateral slope 131a can be increased, and the first extension width L1 of the lateral slope 131a can be increased, thereby increasing the lateral slope area of ​​the outlet hole 130 and improving the blood discharge efficiency.

[0071] As shown in Figures 6, 8, and 9, the minimum width L is... min Midpoint P1 and maximum width L max The radial plane of the midpoint P2 is the third plane 106. Two lateral ramps 131a on the same connecting post 160 are symmetrical about the third plane 106. The planes containing the two lateral ramps 131a have an included angle θ, which can be set to 80°–100°, i.e., 80°≤θ≤100°. For example, the included angle θ can be set to 82°, 85°, 90°, 95°, 100°, etc. In this way, the two lateral ramps 131a of the connecting post 160 can guide blood to flow evenly through the outlet holes 130 on both sides of the connecting post 160, reducing blood turbulence.

[0072] To facilitate the delivery of the blood pump 10 into the patient's body, the outlet tube 100 is generally designed as a circular tube resembling a blood vessel structure. The connecting column 160, as part of the outlet tube 100, has its outer second surface 162 and inner first surface 161 both designed as arc surfaces. The first surface 161 is part of the inner wall surface 110, and the second surface 162 is part of the outer wall surface 120. This design of the connecting column 160 not only reduces the difficulty of delivering the blood pump 10 into the patient's body and avoids sharp edges on the inner and outer walls of the pump housing, preventing damage to blood vessels, but also reduces the likelihood of hemolysis. Of course, in some other embodiments, only the outer second surface 162 or the inner first surface 161 of the connecting column 160 may be designed as an arc surface.

[0073] The first surface 161 has the same curvature as the inner wall surface 110 of the main body 140, and the second surface 162 has the same curvature as the inner wall surface 110 of the main body 140.

[0074] Specifically, in one embodiment, as shown in FIG3, the outlet pipe 100 includes a main body 140 and a plurality of connecting posts 160; the main body 140 has a distal end and a proximal end opposite to each other along the axial direction of the outlet pipe 100; the plurality of connecting posts 160 are connected to the proximal end of the main body 140 and are arranged at intervals along the circumference of the main body 140, and an outlet hole 130 is formed between two adjacent connecting posts 160. The lateral wide slope 131a is located on the connecting post 160, and the distal wide slope 131b is located at the proximal end of the main body 140. This structure of the outlet pipe 100 is simple, facilitates the formation of the outlet hole 130 on the outlet pipe 100, and is beneficial to the production and processing of the outlet pipe 100.

[0075] The proximal end of the connecting post 160 (i.e., the end of the connecting post 160 away from the main body 140) is a free end and can be connected and fixed to the pump housing of the blood pump 10. A clearance zone 170 is formed between the proximal ends of two adjacent connecting posts 160. With this arrangement, the end of the second tube segment 150 away from the main body 140 does not have a cylindrical tube body. Since the lateral wide slope 131a and the distal wide slope 131b are inclined inward relative to the central axis 101 of the outlet pipe 100, that is, the lateral wide slope 131a and the distal wide slope 131b are located inside the outlet hole 130, this is difficult to form through secondary processing, that is, first process the outlet pipe 100, and then process the inclined lateral wide slope 131a and the distal wide slope 131b on the hole wall 131 of the outlet hole 130. Therefore, it is suitable to adopt an integral molding method, such as casting or 3D printing. After molding, it is also necessary to deburr and perform other treatments at the connection between the wide slope 131a and the inner and outer wall surfaces 120 of the outlet pipe 100. If both ends of the connecting column 160 are provided with cylindrical tubes, it will increase the difficulty of forming and interfere with the subsequent deburring operation. Conversely, if the end of the connecting column 160 away from the main tube 140 is not provided with a cylindrical tube and forms an empty area 170, it can reduce the difficulty of forming and subsequent deburring and other processes.

[0076] The proximal end of the connecting post 160 can be connected to the pump housing of the blood pump 10 by welding, bonding, or other methods. For example, when the blood pump 10 includes a motor 200 that can be placed inside the body, the outer casing 210 of the motor 200 serves as the pump housing. Specifically, the outer casing 210 includes a main housing 211 and a distal end cover 212 connected to the distal end of the main housing 211; the proximal end of the connecting post 160 is connected to the distal end cover 212.

[0077] As shown in Figure 1, the distal end cover 212 has an outer peripheral surface 212a, a top surface 212b, and an arcuate convex surface 212c connecting the outer peripheral surface 212a and the top surface 212b. The outer peripheral surface 212a is connected to the proximal end of the connecting post 160. The distal end cover 212 also has a through hole penetrating the top surface 212b, through which the rotating shaft 240 of the power supply motor 200 passes. Since the proximal end of the connecting post 160 is connected to the outer peripheral surface 212a of the distal end cover 212, the top surface 212b and the arcuate convex surface 212c of the distal end cover 212 extend into the outlet pipe 100 and correspond to the outlet hole 130. This means that when blood is discharged from the outlet hole 130, it will come into contact with the top surface 212b and the arcuate convex surface 212c of the distal end cover 212. In this regard, this application sets the transition surface between the outer peripheral surface 212a and the top surface 212b of the distal end cover 212 as the arcuate convex surface 212c, which can also guide the discharge of blood and improve the discharge efficiency.

[0078] In summary, the outlet pipe 100 and the blood pump 10 with the outlet pipe 100 provided in this application, by setting at least a portion of the orifice wall 131 of the outlet hole 130, namely the broad slope 1311, to be inclined radially inward toward the blood flow channel 105 along the outlet pipe 100 and with the projection of the outer wall surface 120 onto the longitudinal plane containing the central axis of the outlet pipe 100 covering the broad slope 1311, can guide the discharge of blood. Furthermore, by setting the relationship between the extension width L of the broad slope 1311 and the wall thickness H of the outlet pipe 100, i.e., L≥0.6H, the width of the broad slope 1311 can be made larger. Thus, the outlet hole 130 has a larger broad slope area, which can fully guide the blood to gradually switch from axial flow along the broad slope 1311 of the outlet hole 130 to radial flow. This reduces the resistance and kinetic energy loss of the blood during the entire process of blood discharge from the outlet hole 130, resulting in high discharge efficiency and improving the pumping efficiency of the blood pump 10.

[0079] Specifically, when the blood pump 10 is pushed into the patient's body, the outer surface of the outlet tube 100 is more likely to come into contact with the inner wall of the tissue. Therefore, when the outer surface of the outlet tube 100 is not smooth, deburring and other processing are required, and the processing precision requirements are higher, making manufacturing more difficult. In this application, since the large bevel (i.e., the broad bevel 1311) is hidden inside the outlet tube 100, it is less likely to come into contact with and rub against the inner wall of the tissue. Therefore, the precision of processing such as deburring during manufacturing can be appropriately reduced. Furthermore, the outer surface of the outlet tube 100 is a smooth cylindrical surface, which is not affected by the broad bevel 1311, resulting in fewer burrs generated during the forming process, thereby effectively reducing the manufacturing difficulty.

[0080] As shown in Figure 1, in some embodiments of this application, the motor 200 of the blood pump 10 includes a housing 210 (i.e., the pump casing mentioned above), a stator 220, a rotor 230, and a shaft 240. The distal end of the housing 210 is fixedly connected to the proximal end of the outlet pipe 100, and the proximal end of the housing 210 is fixedly connected to the distal end of the conduit 400. The stator 220 is disposed in the housing 210, and the rotor 230 is arranged axially with the stator 220. The shaft 240 rotatably passes through the stator 220; the shaft 240 is fixedly connected to the rotor 230; the distal end of the shaft 240 extends into the outlet pipe 100 to be fixedly connected to the impeller 300. When the stator 220 is working, it can generate a rotating magnetic field that causes the rotor 230 to rotate. Under this rotating magnetic field, the rotor 230 drives the shaft 240 to rotate, and the impeller 300 also rotates accordingly.

[0081] As shown in Figure 1, the proximal end of the housing 210 of the motor 200 includes a main housing 211 and a distal end cover 212 connected to the distal end of the main housing 211. The distal end cover 212 is fixedly connected to the connecting post 160 of the outlet pipe 100. The housing 210 may also include a proximal end cover 213, which is fixedly connected to the distal end of the conduit 400.

[0082] As shown in Figure 7, the blood pump 10 also includes a cannula 500 and an inlet tube 600. The distal end of the cannula 500 is fixedly connected to the outlet tube 100 and the proximal end of the inlet tube 600. The inlet tube 600 has an inlet hole 610 for blood to flow into the blood pump 10. The outlet tube 100 and the inlet tube 600 can be made of biocompatible metal materials, such as titanium alloy or 316L steel; the cannula 500 can be a flexible tube that can be bent.

[0083] When the blood pump 10 is used as a left ventricular interventional pump, it pushes blood pump 10 from the aorta to the left ventricle, with the inlet port 610 of the blood pump 10 located within the left ventricle and serving as a blood inlet, while the outlet port 130 is located within the aorta and serves as a blood outlet. When the blood pump 10 is used as a right ventricular interventional pump, it pushes blood pump 10 from the right ventricle to the pulmonary artery, with the outlet port 130 of the blood pump 10 located within the right ventricle and serving as a blood inlet, while the inlet port 610 is located within the pulmonary artery and serves as a blood outlet.

[0084] It is understandable that the inlet tube 600 is not essential; for example, an inlet port can be directly opened at the distal end of the insertion tube 500. Of course, the insertion tube 500 is also not mandatory. For example, when the blood pump 10 is used as a right ventricular interventional pump, considering the characteristics of right ventricular stenosis, an outlet port 130 can be provided at the distal end of the outlet tube 100, and an inlet port can be provided at the proximal end of the outlet tube 100 to accommodate the narrowed right ventricle. The blood pump 10 is pushed from the right ventricle to the pulmonary artery, with the inlet port of the blood pump 10 located within the right ventricle, and the outlet port 130 located within the pulmonary artery. The outlet tube 100 can be a short, straight tube. It is understandable that the structure of the right ventricular interventional pump can be the same as that of the left ventricular interventional pump.

[0085] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0086] The embodiments described above are merely illustrative of several implementation methods of this application, and 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 those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An outlet tube, said outlet tube being used in a percutaneously inserted blood pump into a patient, characterized in that, The outlet pipe has: inner wall surface; An outer wall surface, said outer wall surface being located on the outer periphery of said inner wall surface; the outlet pipe having a wall thickness located between said inner wall surface and outer wall surface; and An outlet hole penetrates the inner wall surface and the outer wall surface, and a hole wall is formed around the circumference of the outlet hole to define the outlet hole; the hole wall includes a broad inclined surface, which is inclined relative to both the outer wall surface and the inner wall surface; The broad slope is shielded by the outer wall surface in the direction from the outside of the outlet hole along the radial direction of the outlet pipe to the inside of the outlet hole; the broad slope has an extension width extending in its inclined direction, the extension width being not less than 0.6 times the thickness of the pipe wall.

2. The outlet pipe according to claim 1, characterized in that, The broad slope includes: A distal broad bevel, the distal broad bevel being located at the distal end of the outlet orifice; and Two lateral wide slopes are located on either side of the distal wide slope, the lateral wide slopes extending along the axial direction of the outlet pipe, and the distal ends of the lateral wide slopes are smoothly connected to the distal wide slope.

3. The outlet pipe according to claim 2, characterized in that, The lateral slope intersects the inner wall surface to form an intersection line, and the plane coplanar with the central axis of the outlet pipe is a first plane, with a first inclination angle between the lateral slope and the first plane; The plane perpendicular to the central axis of the outlet pipe is the second plane, and the distal broad slope has a second inclination angle with the second plane; At least one of the first tilt angle and the second tilt angle is set to 35° to 65°.

4. The outlet pipe according to claim 3, characterized in that, The outlet pipe also has at least one of the following characteristics: The second tilt angle is smaller than the first tilt angle; The first tilt angle is set to 35° to 50°; The second tilt angle is set to 45° to 60°.

5. The outlet pipe according to claim 2, characterized in that, The extension width of the lateral wide slope is a first extension width, and the extension width of the distal wide slope is a second extension width; the first extension width is greater than the second extension width.

6. The outlet pipe according to claim 5, characterized in that, The outlet pipe includes a connecting post located between two adjacent outlet holes. The connecting post has a first surface, a second surface, and two lateral slopes. The first surface is part of the inner wall surface, the second surface is part of the outer wall surface, and the lateral slopes connect the first surface and the second surface. The width of the connecting column along the circumference of the outlet pipe gradually decreases from the second surface to the first surface, and has the minimum width on the first surface and the maximum width on the second surface; Wherein, the minimum width is less than the first extension width; And / or, the maximum width is greater than twice the wall thickness.

7. The outlet pipe according to claim 6, characterized in that, The radial plane passing through the midpoint of the minimum width and the midpoint of the maximum width is the third plane, and the two lateral slopes located on the same connecting column are symmetrical about the third plane.

8. The outlet pipe according to claim 2, characterized in that, The distal wide slope is configured to be concave arc-shaped relative to the distal end of the outlet pipe, so that the two ends of the distal wide slope smoothly transition to the distal ends of the two lateral wide slopes respectively.

9. The outlet pipe according to claim 2, characterized in that, The outlet pipe also has at least one of the following characteristics: The lateral slope has a first inner edge adjacent to the inner wall surface, and the connection between the first inner edge and the inner wall surface is provided with a first rounded corner. The lateral slope has a first outer edge adjacent to the outer wall surface, and a second rounded corner is provided at the connection between the first outer edge and the outer wall surface. The distal wide slope has a second inner edge adjacent to the inner wall surface, and a third rounded corner is provided at the connection between the second inner edge and the inner wall surface; The distal wide slope has a second outer edge adjacent to the outer wall surface, and the connection between the second outer edge and the outer wall surface is provided with a fourth rounded corner.

10. The outlet pipe according to claim 2, characterized in that, The outlet pipe includes: A main body having a distal end and a proximal end; and Multiple connecting posts are connected to the proximal end of the main body and are arranged at intervals along the circumference of the main body, with the outlet hole formed between two adjacent connecting posts; The lateral sloping surface is located on the connecting post, and the distal sloping surface is located at the proximal end of the main body. The proximal end of the connecting post is a free end, forming a clearance zone between the proximal ends of two adjacent connecting posts. The clearance zone is opposite to the distal sloping surface, and the proximal end of the connecting post can be used to connect and fix the pump housing of the blood pump.

11. The outlet pipe according to claim 1, characterized in that, The outlet pipe also has at least one of the following characteristics: The extension width is less than or equal to 1.3 times the pipe wall thickness; The wall thickness of the pipe is set to 0.15mm to 0.3mm.

12. A blood pump, characterized in that, The blood pump includes an impeller and an outlet pipe; the impeller is rotatably disposed within the outlet pipe; the outlet pipe has: inner wall surface; An outer wall surface, said outer wall surface being located on the outer periphery of said inner wall surface; the outlet pipe having a wall thickness located between said inner wall surface and outer wall surface; and An outlet hole penetrates the inner wall surface and the outer wall surface, and a hole wall is formed around the circumference of the outlet hole to define the outlet hole; the hole wall includes a broad inclined surface, which is inclined relative to both the outer wall surface and the inner wall surface; The broad slope is shielded by the outer wall surface in the direction from the outside of the outlet hole along the radial direction of the outlet pipe to the inside of the outlet hole; the broad slope has an extension width extending in its inclined direction, the extension width being not less than 0.6 times the thickness of the pipe wall.

13. The blood pump according to claim 12, characterized in that, The wide bevel of the outlet pipe includes at least a distal wide bevel, which is located at the distal end of the outlet orifice. The impeller includes blades, each blade having an outer edge, the outer edge including a distal section and a proximal section; the distal section is spaced apart from the inner wall surface by a first distance; the proximal section corresponds to the outlet orifice, and a portion of the proximal section is spaced apart from the distal broad slope by a second distance; Wherein, the second spacing is greater than the first spacing; and / or, the second spacing is gradually increased along the direction from the distal end to the proximal end of the outlet pipe.

14. The blood pump according to claim 12, characterized in that, The broad slope includes: A distal broad bevel, the distal broad bevel being located at the distal end of the outlet orifice; and Two lateral broad slopes are located on both sides of the distal broad slope, the lateral broad slopes extend along the axial direction of the outlet pipe, and the distal ends of the lateral broad slopes are smoothly connected to the distal broad slope. The lateral slope intersects the inner wall surface to form an intersection line, and the plane coplanar with the central axis of the outlet pipe is a first plane, with a first inclination angle between the lateral slope and the first plane; The plane perpendicular to the central axis of the outlet pipe is the second plane, and the distal broad slope has a second inclination angle with the second plane; at least one of the first inclination angle and the second inclination angle is set to 35° to 65°.

15. The blood pump according to claim 14, characterized in that, The outlet pipe also has at least one of the following characteristics: The second tilt angle is smaller than the first tilt angle; The first tilt angle is set to 35° to 50°; The second tilt angle is set to 45° to 60°.

16. The blood pump according to claim 14, characterized in that, The extension width of the lateral wide slope is a first extension width, and the extension width of the distal wide slope is a second extension width; the first extension width is greater than the second extension width. The outlet pipe includes a connecting post located between two adjacent outlet holes. The connecting post has a first surface, a second surface, and two lateral slopes. The first surface is part of the inner wall surface, the second surface is part of the outer wall surface, and the lateral slopes connect the first surface and the second surface. The width of the connecting column along the circumference of the outlet pipe gradually decreases from the second surface to the first surface, and has the minimum width on the first surface and the maximum width on the second surface; Wherein, the minimum width is less than the first extension width; And / or, the maximum width is greater than twice the wall thickness.

17. The blood pump according to claim 12, characterized in that, The blood pump also includes a motor, the distal end of which is fixedly connected to the proximal end of the outlet tube, and the motor is fixedly connected to the impeller. The blood pump also includes a cannula and an inlet tube, the distal end of the cannula being fixedly connected to the outlet tube and the proximal end of the inlet tube, the inlet tube having an inlet hole for blood to flow into the blood pump.

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