Outlet tube and blood pump

Abstract

The application relates to a blood pump. The blood pump comprises an outlet pipe having an inner wall surface, an outer wall surface and an outlet hole; the outer wall surface is located at the periphery of the inner wall surface; the outlet pipe has a pipe wall thickness between the inner wall surface and the outer wall surface; the outlet hole penetrates through the inner wall surface and the outer wall surface; the circumference of the outlet hole is formed with a hole wall defining the outlet hole; the hole wall comprises a broad inclined surface which is inclined relative to the outer wall surface and the inner wall surface; the broad inclined surface is shielded by the outer wall surface in the direction from the outer side of the outlet hole to the inner side of the outlet hole along the radial direction of the outlet pipe; 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 pipe wall thickness. The blood pump can improve the blood pumping efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to an outlet tube and a blood pump. BACKGROUND

[0002] The blood pump is a mechanical circulation support device that directly pumps blood from the venous system or heart into the arterial system, partially or entirely replacing the function of the heart chamber. When the blood pump is working, the blood pump drives the blood of a patient to enter the blood pump first, then the blood is accelerated by the impeller in the blood pump, and finally the blood is discharged from the outlet of the blood pump. However, the resistance of the blood discharged from the outlet of the blood pump is relatively large, resulting in a relatively low blood pumping efficiency of the blood pump. SUMMARY

[0003] 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.

[0004] In some embodiments, the outlet tube has an inner wall surface, an outer wall surface and an outlet hole; the outer wall surface is 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; the outlet hole penetrates the inner wall surface and the outer wall surface. The circumference of the outlet hole forms 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; the broad inclined surface is shielded 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.

[0005] In some embodiments, the broad inclined surface at least includes:

[0006] a distal broad inclined surface located at the distal end of the outlet hole; and

[0007] two side broad inclined surfaces located on both sides of the distal broad inclined surface, the side broad inclined surfaces extending along the axial direction of the outlet tube, and the distal ends of the side broad inclined surfaces are smoothly connected with the distal broad inclined surface.

[0008] In some embodiments, the side broad inclined surface intersects with the inner wall surface to have an intersection line, a plane in which the intersection line and the central axis of the outlet tube are coplanar is a first plane, and the side broad inclined surface and the first plane have a first inclination angle therebetween;

[0009] a plane perpendicular to the central axis of the outlet tube is a second plane, and the distal broad inclined surface and the second plane have a second inclination angle therebetween;

[0010] At least one of the first inclination angle and the second inclination angle is 35°-65°.

[0011] In some embodiments, the outlet pipe further has at least one of the following features:

[0012] The second inclination angle is smaller than the first inclination angle.

[0013] The first inclination angle is set to be 35°-50°.

[0014] The second inclination angle is set to be 45°-60°.

[0015] In some embodiments, the side bevel has a first extension width, and the distal bevel has a second extension width; the first extension width is greater than the second extension width.

[0016] In some embodiments, the outlet pipe comprises a connecting column between two adjacent outlet holes, the connecting column has a first surface, a second surface, and two side bevels, the first surface is part of the inner wall surface, the second surface is part of the outer wall surface, and the side bevels are connected to the first surface and the second surface.

[0017] The width of the connecting column in the circumferential direction of the outlet pipe gradually decreases from the second surface to the first surface, and has a minimum width at the first surface and a maximum width at the second surface.

[0018] The minimum width is less than the first extension width; and / or, the maximum width is greater than twice the pipe wall thickness.

[0019] In some embodiments, the outlet pipe further has at least one of the following features:

[0020] The side bevel 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 fillet.

[0021] The side bevel has a first outer edge adjacent to the outer wall surface, and the connection between the first outer edge and the outer wall surface is provided with a second fillet.

[0022] The distal bevel has a second inner edge adjacent to the inner wall surface, and the connection between the second inner edge and the inner wall surface is provided with a third fillet.

[0023] The distal bevel 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 fillet.

[0024] In some embodiments, the outlet pipe comprises:

[0025] a main body having a distal end and a proximal end; and

[0026] a plurality of connecting columns connected with the proximal end of the main body and arranged along the circumference of the main body, and the outlet hole is formed between two adjacent connecting columns;

[0027] wherein the side broad slope is located on the connecting column, and the distal end broad slope is located on the proximal end of the main body; the proximal end of the connecting column is a free end to form a clearance between the proximal ends of two adjacent connecting columns, the clearance is opposite to the distal end broad slope, and the proximal end of the connecting column can be connected and fixed with a pump shell of a blood pump.

[0028] In some embodiments, the outlet pipe has at least one of the following characteristics:

[0029] the extension width is less than or equal to 1.3 times of the pipe wall thickness;

[0030] the pipe wall thickness is set to 0.15mm-0.3mm.

[0031] In some embodiments, the blood pump comprises an impeller and an outlet pipe according to any one of the above embodiments; the impeller is rotatably arranged in the outlet pipe.

[0032] In some embodiments, the broad slope of the outlet pipe comprises at least a distal end broad slope located at the distal end of the outlet hole; the impeller comprises blades, the blades have outer edges comprising distal segments and proximal segments; the first spacing is arranged between the distal segments and the inner wall surface; the proximal segments correspond to the outlet hole, and a part of the proximal segments is spaced apart from the distal end broad slope by a second spacing; wherein the second spacing is greater than the first spacing; and / or, the second spacing is gradually increased from the distal end of the outlet pipe to the proximal end thereof.

[0033] The aforementioned outlet pipe and blood pump, by setting at least a portion of the outlet hole wall as a broad slope, wherein the broad slope is inclined relative to both the outer and inner wall surfaces, and is blocked by the outer wall surface in the radial direction from the outside of the outlet hole to the inside of the outlet hole, can guide blood outward from the outlet hole, reducing resistance to blood discharge and facilitating blood discharge. Furthermore, by setting the extension width of the broad slope to be no less than 0.6 times the wall thickness of the outlet pipe, the width of the broad slope can be made larger, forming a large slope on the inner side of the outlet hole. This results in a larger broad slope area for the outlet hole, effectively guiding blood to gradually switch from axial flow along the broad slope of the outlet hole to radial flow, thus reducing resistance, minimizing kinetic energy loss, and increasing discharge efficiency throughout the blood discharge process, thereby improving the pumping efficiency of the blood pump.

[0034] Specifically, when the blood pump is inserted into the patient's body, the outer surface of the outlet tube 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, however, because the large bevel (i.e., the broad bevel) is hidden inside the outlet tube, 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 appropriately reduced. Furthermore, the outer surface of the outlet tube is a smooth cylindrical surface, unaffected by the broad bevel, resulting in fewer burrs generated during the forming process, thereby effectively reducing manufacturing difficulty. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the proximal portion of a blood pump provided in an embodiment of this application.

[0036] Figure 2 For blood in Figure 1 A schematic diagram of the flow in the outlet pipe of the provided blood pump.

[0037] Figure 3 for Figure 1 A schematic diagram of the outlet pipe of the blood pump, viewed from a first angle.

[0038] Figure 4 for Figure 1 A schematic diagram of the outlet pipe of the blood pump, viewed from a second angle.

[0039] Figure 5 for Figure 4 The provided cross-sectional view of the outlet pipe in the AA direction.

[0040] Figure 6 for Figure 4 The provided cross-sectional view of the outlet pipe in the BB direction.

[0041] Figure 7 Structure diagram of the distal part of the blood pump according to an embodiment of the present application.

[0042] Figure 8 , Figure 9 and Figure 10 are Figure 6 a partial enlarged view at D.

[0043] Figure 11 is Figure 5 a partial enlarged view at C.

[0044] Figure 12 is Figure 1 a longitudinal sectional view of the blood pump according to the present application.

[0045] Figure 13 is Figure 12 a partial enlarged view at E.

[0046] Figure 14 is Figure 1 a top view of the blood pump according to the present application.

[0047] Figure 15 is Figure 12 a schematic view of the blood pump according to the present application arranged on a guide wire.

[0048] Figure 16 is Figure 15 a partial enlarged view at F.

[0049] 10, blood pump; 100, outlet tube; 110, inner wall surface; 120, outer wall surface; 130, outlet hole; 131, hole wall; 1311, broad bevel; 131a, side broad bevel; 131b, distal broad bevel; 132, first fillet; 133, second fillet; 134, third fillet; 135, fourth fillet; 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 cover; 212a, outer peripheral surface; 212b, top surface; 212c, arc convex surface; 213, proximal cover; 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 hole; 700, guide wire; 710, curved portion; 720, portion outside the outlet hole. DETAILED DESCRIPTION

[0050] In order to make the above objectives, features and advantages of the present application more clear and comprehensible, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of different ways beyond the specific embodiments described and it is to be understood that the present application is not limited in this regard. In other instances, well-known methods have not been described in detail in order to avoid unnecessarily obscuring the present application.

[0051] In the description of the present application, it should be understood that, if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0052] In addition, if the terms "first", "second" appear, these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features referred to. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, if the term "a plurality of" appears, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly specified and limited.

[0053] In the present application, unless otherwise explicitly specified and limited, if the terms "mounting", "connecting", "connecting", "fixing" and the like appear, these terms should be understood in a broad sense. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0054] In the present application, unless specifically stated and limited otherwise, if there is a description of a first feature "on" or "under" a second feature, etc., it can mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "on", "above" and "over" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0055] It should be noted that if an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or there can be an intermediate element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there can be an intermediate element. If present, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the present application are only for illustrative purposes and do not represent the only implementation.

[0056] It should be noted that "distal" and "proximal" throughout the text are only for indicating relative positional relationship, the "distal" of a component refers to the end of the component that enters the patient's body first and / or is farther away from the operator during normal operation, and the "proximal" refers to the end that enters the patient's body later and / or is closer to the operator.

[0057] The blood pump, also known as a percutaneous intervention blood pump, is often used to push blood from a blood vessel into a patient's heart chamber to assist the patient's heart in pumping blood from the heart chamber to the artery to provide support for the patient's blood circulation. When the blood pump is working, the blood pump drives the patient's blood to enter the blood pump from the inlet of the blood pump, then flows along the axial direction of the blood pump, and finally flows along the radial direction of the blood pump and is discharged from the outlet of the blood pump to realize blood circulation. However, when the blood is discharged from the outlet of the blood pump, the blood needs to change from axial flow to radial flow, and the change of the blood flow direction will cause large kinetic energy loss of the blood, increase the difficulty of discharging the blood from the outlet of the blood pump, and result in low blood pumping efficiency of the blood pump.

[0058] To this end, an embodiment of the present application provides an outlet tube and a blood pump, the outlet tube can be applied to the blood pump to provide support for the patient's blood circulation. Wherein, the blood pump 10 can be a left heart intervention pump as shown. Of course, in other embodiments, it can be used as a right heart intervention pump. In the drawings of the present application, the arrow Y+ represents the direction from the proximal end to the distal end, and the arrow Y- represents the direction from the distal end to the proximal end. Figure 1 Figure 2 ​The dashed arrow in the figure represents a schematic view of the blood flow in the outlet tube 100 of the left heart intervention pump.

[0059] As shown in the figure, the blood pump 10 comprises an outlet tube 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 at the outer periphery of the inner wall surface 110. The outlet hole 130 penetrates the inner wall surface 110 and the outer wall surface 120. When the blood pump 10 is in operation, blood flows through the blood flow channel 105 of the outlet tube 100 and is discharged outwardly from the outlet hole 130. Figures 1 to 3 As shown in the figure, the outlet hole 130 is provided in multiple, and the multiple outlet holes 130 are arranged at intervals along the circumference of the outlet tube 100. Alternatively, the multiple outlet holes 130 are uniformly arranged at intervals along the circumference of the outlet tube 100. By uniformly arranging the multiple outlet holes 130, it can be ensured that the blood is uniformly discharged from the outlet tube 100 along the circumference of the outlet tube 100. As for the number of the outlet holes 130, it can be 2, 3, 4, 5, 6 or more, without specific limitation, as long as it does not affect the strength of the outlet tube 100 and the smooth discharge of the blood.

[0060] Figures 3 to 6 The blood pump 10 further comprises an impeller 300, which is rotatably arranged in the blood flow channel 105 in the outlet tube 100. By driving the impeller 300 to rotate, the blood can flow through the blood flow channel 105 of the outlet tube 100 and be discharged outwardly from the outlet hole 130. The impeller 300 comprises a hub 310 and multiple blades 320 arranged on the hub 310. The number of the blades 320 can be 2, 3 or 4.

[0061] The blood pump 10 further comprises a motor 200, the distal end of which is fixedly connected with the proximal end of the outlet tube 100, and the motor 200 is fixedly connected with the impeller 300, so as to drive the impeller 300 to rotate by the motor 200. In the embodiment, the motor 200 is an in-vivo motor, which can be pushed into the blood vessel together with the outlet tube 100. In other embodiments, the motor 200 can also be an in-vitro motor, i.e. the motor 200 is placed outside the body, and the motor 200 is connected to the impeller 300 through a flexible shaft, so as to drive the impeller 300 to rotate by the flexible shaft.

[0062] The blood pump 10 further comprises a catheter 400, the distal end of which is fixedly connected with the proximal end of the motor 200. The catheter 400 has an inner cavity, which can accommodate pipelines such as a flushing tube, a sensor optical fiber or an electric wire of the motor 200. In other embodiments, when the motor 200 is an in-vitro motor, the flexible shaft connecting the motor 200 and the impeller 300 can also extend through the inner cavity of the catheter 400.

[0063] The blood pump 10 further comprises a catheter 400, the distal end of which is fixedly connected with the proximal end of the motor 200. The catheter 400 has an inner cavity, which can accommodate pipelines such as a flushing tube, a sensor optical fiber or an electric wire of the motor 200. In other embodiments, when the motor 200 is an in-vitro motor, the flexible shaft connecting the motor 200 and the impeller 300 can also extend through the inner cavity of the catheter 400.

[0064] ​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. The direction from the outer side of the outlet hole 130 along the radial direction of the outlet pipe 100 to the inner side of the outlet hole 130 (i.e.,...) Figure 6 (In the direction indicated by arrow S), the broad slope 1311 is obscured by the outer wall surface 120. In simpler terms, when looking from the outside of the outlet pipe 100 through the outlet hole 130 along the radial direction of the outlet pipe 100 towards the inside of the outlet pipe 100, the broad slope 1311 is obscured by the outer wall surface 120, so the broad slope 1311 is not visible, making the broad slope 1311 hidden inside the outlet pipe 100.

[0065] 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.

[0066] like Figure 8 As shown, 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.

[0067] In particular, when the blood pump 10 is pushed into the patient's body, the outer surface of the outlet pipe 100 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, since the large slope (i.e. the wide slope 1311) is hidden inside the outlet pipe 100, it is less likely to contact and rub the inner wall of the tissue, so the deburring and processing precision can be appropriately slightly reduced during manufacturing. Moreover, the outer surface of the outlet pipe 100 is a smooth cylindrical surface, which is not affected by the wide slope 1311, and the burr generated during forming is less, thereby effectively reducing the manufacturing difficulty.

[0068] It can be understood that the extension width L of the wide slope 1311 cannot be increased blindly in order to increase the wide slope area of the outlet hole 130. If the extension width L of the wide slope 1311 is too large, as shown in Figure 8 , the cross-sectional area of the part between the two adjacent outlet holes 130 of the outlet pipe 100 (i.e. the connecting column 160 mentioned below) may be reduced, which may weaken the strength of the connecting column 160 of the outlet pipe 100. Therefore, the maximum value of the extension width L of the wide slope 1311 is also limited in the present application. Specifically, L≤1.3H. Preferably, 0.8H≤L≤1.1H. The extension width L of the wide slope 1311 in this range can effectively guide the flow direction of the blood, avoid excessive kinetic energy loss, and effectively ensure the strength of the outlet pipe 100. In addition, it can also avoid the connection between the wide slope 1311 and the outer wall 120 of the outlet pipe 100 being too sharp. It should be noted that Figure 8 the thick dashed line in the figure represents the wide slope 1311 with a large extension width L.

[0069] When designing the blood pump 10, the wall thickness H of the outlet pipe 100 also needs to be limited. Specifically, the wall thickness H can be 0.15mm~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 pipe 100 is too small, the extension width L of the wide slope 1311 will be small, the wide slope area of the outlet hole 130 will be small, and the blood cannot be fully guided to switch from axial flow to radial flow along the wide slope 1311 of the outlet hole 130, which cannot effectively improve the blood pumping efficiency of the blood pump 10. If the wall thickness H of the outlet pipe 100 is too large, the overall radial size of the blood pump 10 will be too large, which will increase the difficulty of transporting the blood pump 10 in the patient's body.

[0070] As shown in Figures 12 to 16As shown, in this case, it is considered that when the guide wire 700 is used to assist the blood pump 10 to push to the target position in the patient's body, after the guide wire 700 enters the blood flow channel 105 of the outlet tube 100, the guide wire 700 generally passes through the blade gap between the two blades 320 of the impeller 300, and then is bent and deflected radially outward at the distal end position adjacent to the outlet hole 130 to pass out of the outlet hole 130, the portion 720 of the guide wire 700 outside the outlet hole 130 will extend close to the outer surface of the motor 200 to the outside of the body. The curved portion 710 of the guide wire 700 can be worn out by contacting the distal end of the outlet hole 130.

[0071] In view of this, in order to reduce the above-mentioned situation, in some embodiments of the present application, the broad chamfer 1311 at least includes a distal broad chamfer 131b located at the distal end of the outlet hole 130. Due to the presence of the distal broad chamfer 131b, when the guide wire 700 passes out of the outlet hole 130, the distal broad chamfer 131b of the outlet hole 130 can avoid the curved portion 710 of the guide wire 700 (see Figure 15 and Figure 16 ), the curved portion 710 of the guide wire 700 is not easy to contact the distal broad chamfer 131b, thereby reducing the contact friction between the guide wire 700 and the distal end of the outlet hole 130, and avoiding the curved portion 710 of the guide wire 700 from being worn out. When pushing the blood pump 10, the blood pump 10 moves in the Y+ direction relative to the guide wire 700, and even if the connection between the distal broad chamfer 131b and the outer wall surface 120 is relatively thin, it is not easy to scratch the guide wire 700.

[0072] In addition, when the blood flows in the Y- direction in the blood flow channel 105 of the outlet tube 100, the blood first contacts the distal broad chamfer 131b when the blood approaches the distal end of the outlet hole 130, so that most of the blood can be guided to be discharged from the outlet hole 130 along the inclination direction of the distal broad chamfer 131b.

[0073] Referring to Figures 12 to 14 Optionally, the blade 320 of the impeller 300 has an outer edge 321 including a connected distal segment 321a and a proximal segment 321b; the distal segment 321a is spaced apart from the inner wall surface 110 in the radial direction by a first distance K1, and the presence of the first distance K1 can enable the impeller 300 to stably rotate in the blood flow channel 105 without contacting and interfering with the inner wall surface 110. The outer edge 321 of the blade 320 is an arc-shaped line extending in the circumferential direction of the hub 310 from the proximal end to the distal end of the impeller 300, for example, an arc-shaped line of exponential gradient or a Bezier curve.

[0074] Further, the proximal section 321b of the outer edge 321 is radially opposite to the outlet hole 130. A part of the proximal section 321b is radially opposite to the distal broad bevel 131b and is spaced from the distal end of the outlet tube 100 by a second distance K2; 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 between the guide wire 700 and the outlet tube 100 can occur, and when the guide wire 700 moves to the space between the proximal section 321b of the blade 320 and the distal broad bevel 131b, since the second distance K2 is large, the guide wire 700 is not easily clamped and stuck by the proximal section 321b and the distal broad bevel 131b, and the guide wire 700 is more easily moved out of the space between the proximal section 321b and the distal broad bevel 131b, thereby ensuring that the blood pump 10 can be smoothly pushed to the target position along the guide wire 700.

[0075] The second distance K2 is gradually increased from the distal end of the outlet tube 100 to the proximal end thereof. At this time, the minimum value of the second distance K2 on the side of the distal broad bevel 131b close to the inner wall surface 110 is greater than the first distance K1. In this way, not only can the guide wire 700 be prevented from being clamped and stuck by the proximal section 321b and the distal broad bevel 131b, but also the blade 300 can drive blood to be quickly discharged.

[0076] As shown in Figure 3 , the broad bevel 1311 further includes a side broad bevel 131a; the side broad bevel 131a extends in the axial direction of the outlet tube 100 and is located on one side of the outlet hole 110, and the distal end of the side broad bevel 131a is smoothly connected to one end of the distal broad bevel 131b. The side broad bevel 131a is an inclined plane. Alternatively, the side broad bevel 131a is provided in two, and the two side broad bevels 131a are arranged on both sides of the outlet hole 130 in a circumferential direction of the outlet tube 100; the distal ends of the two side broad bevels 131a are connected to both ends of the distal broad bevel 131b, respectively. In this way, the broad bevel 1311 is arranged, which can maximize the broad bevel area of the outlet hole 130, can sufficiently guide blood to flow from the axial direction to the radial direction along the broad bevel 1311 of the outlet hole 130, and can minimize the resistance of the blood during the entire process of discharging from the outlet hole 130, thereby effectively improving the blood pumping efficiency of the blood pump 10.

[0077] It can be understood that only one of the side broad bevel 131a and the distal broad bevel 131b can be provided.

[0078] As shown in Figure 5 , Figure 10 and Figure 11As shown, the side wide slope 131a intersects with the inner wall surface 110 of the outlet tube 100 to have an intersection line 102, and the plane in which the intersection line 102 is coplanar with the central axis 101 of the outlet tube 100 is a first plane 103. The first inclination angle a is between the side wide slope 131a and the first plane 103. It is considered that if the first inclination angle a is too small, the area of the side wide slope 131a can be too small to sufficiently guide the blood to gradually switch from the axial flow to the radial flow along the wide slope 1311 of the outlet hole 130. If the first inclination angle a is too large, the connection between the side wide slope 131a and the outer wall surface 120 of the outlet tube 100 can be too sharp. Therefore, the size of the first inclination angle a is designed, and it is found that when the first inclination angle a is set to 35°-65°, the area of the side wide slope 131a can be larger. At the same time, the connection between the side wide slope 131a and the outer wall surface 120 of the outlet tube 100 can not be too thin, and the brittle fracture can be less likely to occur. The first inclination angle a can be specifically set to 35°, 40°, 45°, 55°, 60°, 65°, etc.

[0079] As shown in Figure 5 and Figure 11 , the plane perpendicular to the central axis 101 of the outlet tube 100 is a second plane 104, and the second inclination angle β is between the distal wide slope 131b and the second plane 104. It is considered that if the second inclination angle β is too small, the area of the distal wide slope 131b can be too small to sufficiently guide the blood to gradually switch from the axial flow to the radial flow along the wide slope 1311 of the outlet hole 130. If the second inclination angle β is too large, the connection between the distal wide slope 131b and the outer wall surface 120 of the outlet tube 100 can be too thin, which can cause scratching to the guide wire 700 (such as Figure 15 and Figure 16 ). Therefore, the size of the second inclination angle β is designed, and it is found that when the second inclination angle β is set to 35°-65°, the area of the distal wide slope 131b can be larger. At the same time, the connection between the distal wide slope 131b and the outer wall surface 120 of the outlet tube 100 can not be too thin, which can greatly reduce the occurrence of scratching to the guide wire 700. The second inclination angle β can be specifically set to 35°, 40°, 45°, 55°, 60°, 65°, etc. Of course, in some other embodiments, only the first inclination angle a or the second inclination angle β is set to 35°-65°.

[0080] As shown in Figure 3As shown, the distal broad bevel 131b is arranged to be concave arc-shaped relative to the distal end of the outlet tube 100. In this way, the two ends of the distal broad bevel 131b can smoothly transition with the distal ends of the two side broad bevels 131a, respectively. In this way, stress concentration can be avoided at the connection between the distal broad bevel 131b and the side broad bevel 131a, thereby preventing the outlet tube 100 from cracking under blood scouring, and also avoiding a dead angle at the connection between the distal broad bevel 131b and the side broad bevel 131a, which is conducive to blood discharge.

[0081] When the outlet tube 100 is manufactured in an integral molding manner, since the distal broad bevel 131b is a concave arc surface with a certain curvature, it is difficult to form the distal broad bevel 131b. In view of this, the present application reduces the difficulty of forming the distal broad bevel 131b by reducing the second inclination angle β of the distal broad bevel 131b. Specifically, the second inclination angle β is smaller than the first inclination angle α, i.e. β < α. By setting the second inclination angle β of the distal broad bevel 131b to be smaller than the first inclination angle α of the side broad bevel 131a, not only can the difficulty of forming the distal broad bevel 131b be reduced, facilitating the processing and production of the outlet tube 100, but also the connection between the distal broad bevel 131b and the outer wall surface 120 of the outlet tube 100 can be avoided from being too sharp, thereby reducing the friction of the guide wire 700 at the connection between the distal broad bevel 131b and the outer wall surface 120 of the outlet tube 100.

[0082] Preferably, α is set to 35°-50°, for example, it can be set to 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, it can be set to 45°, 46°, 47°, 48°, 49°, 50°, 51°, 52°, 53°, 54°, 55°, 56°, 57°, 58°, 59°, 60°, etc. By setting the size of α and β in this way, the area of the side broad bevel 131a and the distal broad bevel 131b can be maximized under the premise of β < α, and the probability of hemolysis can also be effectively reduced.

[0083] Since the axial dimension of the outlet tube 100 is large, and the side broad bevel 131a extends along the axial direction of the outlet tube 100, the area of the outlet hole 130 can also be effectively increased by increasing the size of the side broad bevel 131a. Specifically, in some embodiments of the present application, the extension width of the side broad bevel 131a is a first extension width L1, and the extension width of the distal broad bevel 131b is a second extension width L2. Then, L1 > L2. By setting the first extension width L1 of the side broad bevel 131a to be larger than the second extension width L2 of the distal broad bevel 131b, the area of the side broad bevel 131a can be increased. Wherein, as shown in the drawings, the first extension width L1 of the side broad bevel 131a is greater than the second extension width L2 of the distal broad bevel 131b, and the first extension width L1 of the side broad bevel 131a is greater than the second extension width L2 of the distal broad bevel 131b. Figure 10As shown, 0.7H≤L1≤1.3H, preferably, 0.8H≤L1≤1.1H; as Figure 11 As shown, 0.7H≤L2≤1.3H, preferably, 0.8H≤L2≤1.1H.

[0084] In some embodiments of the present application, the broad bevel 131 has an inner edge connected with the inner wall surface 110 and an outer edge connected with 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 a rounded corner. The provision of the rounded corner can avoid 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 being too sharp, and can reduce 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 a rounded corner.

[0085] Specifically, as shown in Figure 10 The side broad bevel 131a has a first inner edge adjacent to the inner wall surface 110, and the connection between the first inner edge and the inner wall surface 110 of the outlet tube 100 is provided with a first rounded corner 132. The provision of the first rounded corner 132 can avoid the connection between the side broad bevel 131a and the inner wall surface 110 of the outlet tube 100 being too sharp, and can reduce the probability of hemolysis.

[0086] The side broad bevel 131a also has a first outer edge adjacent to the outer wall surface 120, and the connection between the first outer edge and the outer wall surface 120 of the outlet tube 100 is provided with a second rounded corner 133. The provision of the second rounded corner 133 can avoid the connection between the side broad bevel 131a and the outer wall surface 120 of the outlet tube 100 being too sharp, can avoid causing harm to the patient, and can also reduce the probability of hemolysis.

[0087] As shown in Figure 11 The distal end broad bevel 131b has a second inner edge adjacent to the inner wall surface 110, and the connection between the second inner edge and the inner wall surface 110 of the outlet tube 100 is provided with a third rounded corner 134. The provision of the third rounded corner 134 can avoid the connection between the distal end broad bevel 131b and the inner wall surface 110 of the outlet tube 100 being too sharp, and can reduce the probability of hemolysis.

[0088] The distal end broad bevel 131b also has a second outer edge adjacent to the outer wall surface 120, and the connection between the second outer edge and the outer wall surface 120 of the outlet tube 100 is provided with a fourth rounded corner 135. The provision of the fourth rounded corner 135 can avoid the connection between the fourth broad bevel 1311 and the outer wall surface 120 of the outlet tube 100 being too sharp, can avoid causing harm to the patient, and can also avoid wearing the guide wire 700.

[0089] In some embodiments of the present application, as shown in Figure 3 Each connecting column 160 has a first surface 161 facing the central axis 101 of the outlet pipe 100, a second surface 162 opposite to the first surface 161, and two side broad inclined surfaces 131a connected to the first surface 161 and the second surface 162. Figure 10 The width of the connecting column 160 in the circumferential direction of the outlet pipe 100 gradually decreases from the second surface 162 to the first surface 161. By setting the width of the connecting column 160 in the circumferential direction of the outlet pipe 100 in this way, the width W of the outlet hole 130 in the circumferential direction of the outlet pipe 100 gradually increases in the direction close to the central axis of the outlet pipe 100 (see Figure 6 ), that is, the size of the outlet hole 130 is large inside and small outside, which can better guide the blood flow and improve the blood discharge efficiency.

[0090] As shown in Figure 8 The connecting column 160 has a minimum width L min on the first surface 161, and a maximum width L max on the second surface 162. min , for example, L min =0.9L1, L min =0.8L1, L min =0.7L1, L min =0.6L1, L min =0.5L1, etc. By setting the first extension width L min of the side broad inclined surface 131a to be greater than the minimum width L min of the connecting column 160, the first extension width L min of the side broad inclined surface 131a can be increased, thereby increasing the broad inclined area of the outlet hole 130 and improving the blood discharge efficiency.

[0091] As shown in Figure 8 The connecting column 160 has a maximum width L max on the second surface 162, and a minimum width L min on the first surface 161. max , for example, L max =2.1H, L max =2.2H, L max =2.3H, L max =2.4H, L max =2.5H, etc. By limiting the maximum width L max of the connecting column 160 relative to the thickness H of the pipe wall of the outlet pipe 100, the inclination angle of the side broad inclined surface 131a can be increased, thereby increasing the first extension width L min of the side broad inclined surface 131a, increasing the broad inclined area of the outlet hole 130, and improving the blood discharge efficiency.

[0092] As shown in Figure 6 , Figure 8 and Figure 9 , the radial plane passing through the midpoint P1 of the minimum width L min and the midpoint P2 of the maximum width L max is the third plane 106, and the two side broad bevels 131a on the same connecting column 160 are symmetrical about the third plane 106. The planes where the two side broad bevels 131a are located have an included angle θ, which can be set to 80°-100°, i.e. 80°≤θ≤100°. For example, the included angle θ is set to 82°, 85°, 90°, 95°, 100°, etc. In this way, the two side broad bevels 131a of the connecting column 160 can guide the blood to be evenly distributed and discharged to the outlet holes 130 on both sides of the connecting column 160, reducing the occurrence of turbulent flow of blood.

[0093] In order to facilitate the blood pump 10 to be pushed in the patient's body, the outlet pipe 100 is generally provided in a circular tube shape similar to the structure of a blood vessel, and the connecting column 160 is part of the outlet pipe 100. The second surface 162 on the outside of the connecting column 160 and the first surface 161 on the inside of the connecting column 160 can be correspondingly provided as circular arc surfaces, wherein the first surface 161 belongs to part of the inner wall surface 110; and the second surface 162 belongs to part of the outer wall surface 120. By providing the connecting column 160 in this way, not only can the difficulty of pushing the blood pump 10 in the patient's body be reduced, but also the inner and outer wall surfaces of the pump shell can be prevented from having edges and corners to prevent damage to blood vessels and reduce the probability of hemolysis. Of course, in other embodiments, only the second surface 162 on the outside of the connecting column 160 or the first surface 161 on the inside of the connecting column 160 can be provided as a circular arc surface.

[0094] In the embodiment, the first surface 161 has the same curvature as the inner wall surface 110 of the main pipe body 140, and the second surface 162 has the same curvature as the inner wall surface 110 of the main pipe body 140.

[0095] Specifically, in an embodiment, as shown in Figure 3 , the outlet pipe 100 includes a main pipe body 140 and a plurality of connecting columns 160; the main pipe body 140 has a distal end and a proximal end opposite along the axial direction of the outlet pipe 100; the plurality of connecting columns 160 are connected to the proximal end of the main pipe body 140 and are arranged at intervals along the circumferential direction of the main pipe body 140, and the outlet holes 130 are formed between adjacent two connecting columns 160. Among them, the side broad bevel 131a is located on the connecting column 160, and the distal end broad bevel 131b is located on the proximal end of the main pipe body 140. The outlet pipe 100 with this structure is simple in structure, which is convenient for forming the outlet holes 130 on the outlet pipe 100 and is beneficial to the production and processing of the outlet pipe 100.

[0096] The proximal end of the connecting column 160 (i.e. the end of the connecting column 160 away from the main pipe body 140) is a free end and can be fixedly connected with the pump shell of the blood pump 10. Adjacent to the proximal ends of two connecting columns 160, a clearance 170 is formed. By such arrangement, the end of the second pipe section 150 away from the main pipe body 140 is not provided with a cylindrical pipe body. Since the side wide inclined surface 131a and the distal end wide inclined surface 131b are inclined inwardly relative to the central axis 101 of the outlet pipe 100, i.e. the side wide inclined surface 131a and the distal end wide inclined surface 131b are located inside the outlet hole 130, which is difficult to form by secondary processing, i.e. the outlet pipe 100 is first processed, and then the inclined side wide inclined surface 131a and the distal end wide inclined surface 131b are processed on the hole wall 131 of the outlet hole 130, so it is appropriate to adopt an integrated molding method, such as casting or 3D printing, and after molding, deburring treatment is required at the connection between the wide inclined surface 1311 and the inner and outer walls 120 of the outlet pipe 100. If the axial ends of the connecting column 160 are both provided with a cylindrical pipe body, the molding difficulty will increase, and the subsequent deburring operation process will also be interfered. Conversely, the end of the connecting column 160 away from the main pipe body 140 is not provided with a cylindrical pipe body and forms a clearance 170, which can reduce the difficulty of molding and subsequent deburring process.

[0097] The proximal end of the connecting column 160 can be connected with the pump shell of the blood pump 10 by welding, bonding or the like. For example, when the blood pump 10 includes a motor 200 that can be placed in the body, the shell 210 of the motor 200 is the pump shell. Specifically, the shell 210 includes a main shell 211 and a distal end cover 212 connected to the distal end of the main shell 211; the proximal end of the connecting column 160 is connected with the distal end cover 212.

[0098] As shown in FIG. 1, Figure 1 The distal end cover 212 has an outer peripheral surface 212a, a top surface 212b, and an arc convex surface 212c connected between the outer peripheral surface 212a and the top surface 212b, and the outer peripheral surface 212a is connected with the proximal end of the connecting column 160. The distal end cover 212 also has a through hole penetrating the top surface 212b, and the through hole is provided for the rotating shaft 240 of the motor 200. Since the proximal end of the connecting column 160 is connected with the outer peripheral surface 212a of the distal end cover 212, the top surface 212b and the arc convex surface 212c of the distal end cover 212 extend into the outlet pipe 100 and correspond to the outlet hole 130, which makes the blood discharged from the outlet hole 130 contact the top surface 212b and the arc convex surface 212c of the distal end cover 212. To this end, the transition surface between the outer peripheral surface 212a and the top surface 212b of the distal end cover 212 is designed as the arc convex surface 212c, which can also guide the discharge of the blood and improve the discharge efficiency of the blood.

[0099] 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.

[0100] 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. Fewer burrs are generated during the forming process, thereby effectively reducing the manufacturing difficulty.

[0101] like Figure 1 As shown, 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.

[0102] like Figure 1 As shown, 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.

[0103] As shown in Figure 7 The blood pump 10 further comprises a cannula 500 fixedly connected to the distal end of the outlet tube 100 and an inlet tube 600 fixedly connected to the proximal end of the inlet tube 600, and 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 a biocompatible metal material, such as titanium alloy or 316L steel, and the cannula 500 can be a soft shell tube capable of bending.

[0104] When the blood pump 10 is used as a left heart intervention pump, the blood pump 10 is pushed from the aorta to the left ventricle, and the inlet hole 610 of the blood pump 10 is located in the left ventricle and used as a blood inlet, and the outlet hole 130 is located in the aorta and used as a blood outlet. When the blood pump 10 is used as a right heart intervention pump, the blood pump 10 is pushed from the right ventricle to the pulmonary artery, and the outlet hole 130 of the blood pump 10 is located in the right ventricle and used as a blood inlet, and the inlet hole 610 is located in the pulmonary artery and used as a blood outlet.

[0105] It can be understood that the inlet tube 600 is not necessary, for example, the inlet hole is directly provided at the distal end of the cannula 500. Of course, the cannula 500 is also not necessary. For example, when the blood pump 10 is used as a right heart intervention pump, considering the characteristics of the stenosis of the right ventricle, the outlet hole 130 can be provided at the distal end of the outlet tube 100, and the inlet hole can be provided at the proximal end of the outlet tube 100 to adapt to the stenosis of the right ventricle. The blood pump 10 is pushed from the right ventricle to the pulmonary artery, and the inlet hole of the blood pump 10 is located in the right ventricle, and the outlet hole 130 is located in the pulmonary artery. The outlet tube 100 can be a short straight tube. It can be understood that the structure of the right heart intervention pump and the left heart intervention pump can also be the same.

[0106] The technical features of the above-mentioned embodiments can be combined in any manner. In order to make the description simple, all possible combinations of the technical features in the above-mentioned embodiments are not described, but as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present application.

[0107] The above-mentioned embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to 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°~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°~50°; The second tilt angle is set to 45°~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 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.

8. 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.

9. The outlet pipe according to any one of claims 1 to 8, 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~0.3mm.

10. A blood pump, characterized in that, The blood pump includes an impeller and an outlet pipe as described in any one of claims 1 to 9; the impeller is rotatably disposed within the outlet pipe.

11. The blood pump according to claim 10, 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.

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