Outlet tube and blood pump

Abstract

The application relates to an outlet pipe and a blood pump. The outlet pipe comprises a pipe body and a flow guide wall; the pipe body is provided with an inner wall surface, an outer wall surface and an outlet hole, the periphery of the outlet hole is formed with a hole wall, the hole wall has an inner periphery and an outer periphery; the flow guide wall is arranged between the outer wall surface and the outer periphery and is inclined from the outer wall surface towards the outer periphery; the flow guide wall comprises a first flow guide surface and a second flow guide surface; wherein the first flow guide surface is close to the proximal end of the outer periphery and forms a first inclination angle with a horizontal plane perpendicular to the axis direction of the pipe body; the second flow guide surface is close to the distal end of the outer periphery and forms a second inclination angle with the horizontal plane, and the first inclination angle is greater than the second inclination angle. The outlet pipe of the blood pump can reduce the difficulty of discharging blood, so as to improve the blood output efficiency of the blood pump.

Description

TECHNICAL FIELD

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

[0002] A blood pump is a kind of blood pump which can be inserted into the heart of a patient through the skin, and is mainly used to assist the blood circulation of the patient. When the blood pump is working, the blood of the patient is first introduced into the blood pump, then accelerated by the impeller in the blood pump, and finally discharged from the outlet pipe of the blood pump. However, it is difficult for the blood to be discharged from the outlet pipe of the blood pump, which leads to a low blood pumping efficiency of the blood pump. SUMMARY

[0003] The present application provides an outlet pipe, which aims to solve the problem of high difficulty in discharging the outlet pipe of the conventional blood pump, so as to improve the blood output efficiency of the blood pump.

[0004] In an embodiment, the outlet pipe comprises a pipe body and a flow guide wall; the pipe body is provided with an inner wall surface, an outer wall surface, a first end, a second end and an outlet hole, the periphery of the outlet hole is formed with a hole wall defining the outlet hole, the hole wall has an inner periphery and an outer periphery; the flow guide wall is arranged between the outer wall surface and the outer periphery and is inclined from the outer wall surface towards the outer periphery; the flow guide wall comprises a first flow guide surface and a second flow guide surface; wherein the first flow guide surface is close to the first end and forms a first inclination angle with a horizontal plane perpendicular to the axis direction of the pipe body; the second flow guide surface is close to the second end and forms a second inclination angle with the horizontal plane, and the first inclination angle is greater than the second inclination angle.

[0005] In an embodiment, the first inclination angle is greater than or equal to 55° and less than or equal to 80°; and / or, the second inclination angle is greater than or equal to 25° and less than or equal to 45°.

[0006] In an embodiment, the difference between the first inclination angle and the second inclination angle is greater than or equal to 27° and less than or equal to 38°.

[0007] In an embodiment, the first flow guide surface is arranged to extend along the circumferential direction of the pipe body; and / or, the second flow guide surface is arranged to be recessed away from the first flow guide surface.

[0008] In an embodiment, in the circumferential direction of the pipe body, the distance between the two ends of the second flow guide surface is greater than the distance between the two ends of the first flow guide surface.

[0009] In an embodiment, the flow guide wall further comprises a side flow guide surface located at two sides of the outer periphery, the side flow guide surface is arranged in a straight surface shape and extends along the axial direction of the pipe body, and two ends of the side flow guide surface are connected with the first flow guide surface and the second flow guide surface respectively.

[0010] In an embodiment, the side flow guide surface forms a third inclination angle with a vertical plane of the pipe body which is perpendicular to the horizontal plane, and the third inclination angle is equal in size to the first inclination angle; wherein the vertical plane is a plane defined by the axis of the pipe body and a side edge of the outer periphery corresponding to the side flow guide surface.

[0011] In an embodiment, the flow guide wall further comprises a first corner flow guide surface located outside a proximal corner of the outer periphery, the first corner flow guide surface is arranged in an arc shape to smoothly connect the side flow guide surface and the first flow guide surface; and / or the flow guide wall further comprises a second corner flow guide surface located outside a distal corner of the outer periphery, the second corner flow guide surface is arranged in an arc shape to smoothly connect the side flow guide surface and the second flow guide surface.

[0012] In an embodiment, the flow guide wall further comprises a first corner flow guide surface located outside a proximal corner of the outer periphery, the first corner flow guide surface is arranged in an arc shape to smoothly connect the side flow guide surface and the first flow guide surface; and the flow guide wall further comprises a second corner flow guide surface located outside a distal corner of the outer periphery, the second corner flow guide surface is arranged in an arc shape to smoothly connect the side flow guide surface and the second flow guide surface; wherein the arc length of the first corner flow guide surface is greater than the arc length of the second corner flow guide surface.

[0013] In an embodiment, the outer side edge of the flow guide wall intersects with the outer wall surface of the pipe body; and / or the inner side edge of the flow guide wall intersects with the hole wall of the outlet hole.

[0014] In an embodiment, the width of the flow guide wall is greater than or equal to 0.65 times the thickness of the pipe body and less than or equal to 0.75 times the thickness of the pipe body.

[0015] In an embodiment, the hole wall of the outlet hole intersects with the inner wall surface of the pipe body to form an inner included angle.

[0016] In an embodiment, the inner included angle is greater than or equal to 90° and less than or equal to 120°.

[0017] In an embodiment, the outlet pipe is suitable for allowing fluid to enter the inside of the outlet pipe from the second end of the outlet pipe and to be discharged outwardly from the outlet hole of the outlet pipe;

[0018] Alternatively, the outlet tube is adapted for fluid to enter the interior of the outlet tube from the outlet aperture of the outlet tube and to exit from the second end of the outlet tube.

[0019] The application also provides a blood pump comprising a cannula and an outlet tube. The second end of the outlet tube is connected to the cannula. The outlet tube comprises a tube body and a flow guide wall; the tube body is provided with an inner wall surface, an outer wall surface and an outlet aperture, the periphery of the outlet aperture is formed with an aperture wall defining the outlet aperture, the aperture wall has an inner periphery and an outer periphery; the flow guide wall is arranged between the outer wall surface and the outer periphery and is inclined from the outer wall surface towards the outer periphery; the flow guide wall comprises a first flow guide surface and a second flow guide surface; wherein the first flow guide surface is close to the first end and forms a first inclination angle with a horizontal plane perpendicular to the axial direction of the tube body; the second flow guide surface is close to the second end and forms a second inclination angle with the horizontal plane, the first inclination angle is greater than the second inclination angle.

[0020] The application sets the flow guide wall on the periphery of the outlet aperture, so that when the blood in the outlet aperture contacts the periphery boundary of the outlet aperture, the blood can flow along the flow guide wall and be guided by the flow guide wall to flow out of the outlet aperture, greatly improving the blood discharge rate and thus improving the blood pumping efficiency of the blood pump. Since the first inclination angle of the first flow guide surface is greater than the second inclination angle of the second flow guide surface, the blood discharge velocity V y1 of the first flow guide surface is greater than the blood discharge velocity V y2 of the second flow guide surface (i.e. V y1 > V y2 ), and thus the blood flows a large amount and quickly to the first end of the tube body, that is, to the aortic arch, effectively improving the blood pumping efficiency of the blood pump. It can be understood that the horizontal plane is a virtual plane for describing the inclination angles of the first flow guide surface and the second flow guide surface. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of an embodiment of the blood pump of the application;

[0022] Figure 2 It is a structural schematic diagram of an embodiment of the outlet tube of the application;

[0023] Figure 3 It is Figure 2 a front view of the outlet tube in FIG. 6;

[0024] Figure 4 It is Figure 3 a sectional view along line A-A in FIG. 6;

[0025] Figure 5 It is Figure 4 an enlarged view of P1 in FIG. 6;

[0026] Figure 6 for Figure 4 Enlarged view at P2;

[0027] Figure 7 This is a front view of another embodiment of the outlet pipe of this application;

[0028] Figure 8 for Figure 7 Enlarged view at P3;

[0029] Figure 9 for Figure 7 Enlarged view at P4;

[0030] Figure 10 for Figure 7 Sectional view along line BB;

[0031] Figure 11 for Figure 10 Enlarged view at page 5;

[0032] Figure 12 for Figure 10 Enlarged view at page 6;

[0033] Figure 13 for Figure 12 A schematic diagram showing the thickness direction of the central tube and the width direction of the side guide surfaces;

[0034] Figure 14 This is a front view of yet another embodiment of the outlet pipe of this application;

[0035] Figure 15 for Figure 14 A cross-sectional view along the CC line;

[0036] Figure 16 for Figure 15 Enlarged view at page 7;

[0037] Figure 17 for Figure 15 Enlarged view at page 8;

[0038] Figure 18 for Figure 14 A sectional view along the DD line;

[0039] Figure 19 for Figure 18 Enlarged view at page 9;

[0040] Figure 20 This is a schematic diagram of the fluid flow direction of the outlet pipe in another embodiment of this application.

[0041] Figure label:

[0042] Label Name Label Name 100 Tube body 220 Second flow guide surface 110 Inner wall surface 230 Side flow guide surface 120 Outer wall surface 240 First corner flow surface 130 Outlet hole 250 Second corner flow surface 131 Hole wall 10 Blood pump 131a Inner periphery 11 Outlet tube 131b Outer periphery 12 Sleeve 140 Partition column 13 Inlet tube 101 Proximal end 14 Distal end part 102 Distal end 15 Driving device 200 Flow guide wall 16 Catheter 210 First flow guide surface DETAILED DESCRIPTION

[0043] 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 will be 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 herein and by one of ordinary skill in the art without departing from the spirit and scope of the present application, and it is therefore intended that all such variations be considered as falling within the scope of the present application.

[0044] 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 are not intended to 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.

[0045] 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 implying the number of technical features indicated. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, if the term "multiple" appears, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0046] 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 interpreted broadly. 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 of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0047] 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 in indirect contact through an intermediate medium. Moreover, the first feature "over", "above" and "on top of" the second feature can mean that the first feature is directly above or obliquely above the second feature, or only means that the first feature is horizontally higher than the second feature. The first feature "under", "below" and "underneath" the second feature can mean that the first feature is directly below or obliquely below the second feature, or only means that the first feature is horizontally lower than the second feature.

[0048] It should be noted that if an element is referred to as being "fixed" or "set" on another element, it can be directly on the other element or there can be an intermediate element. If an element is referred to as being "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", "up", "down", "left", "right" and similar expressions used in the present application are for illustrative purposes only and do not represent the only implementation.

[0049] The present application provides an outlet tube and a blood pump. The blood pump can be an interventional blood pump, which can be used for left ventricular assistance, right ventricular assistance, increasing kidney perfusion, etc. It should be noted that in the field of medical devices, the end of a medical device close to a physician or operator is usually referred to as the proximal end, and the end away from the physician or operator is referred to as the distal end.

[0050] Please refer to Figure 1 and Figure 2 In an embodiment, a blood pump for left ventricular assistance is taken as an example for illustration. The blood pump 10 comprises a sleeve 12 and an outlet tube 11. The second end 102 of the outlet tube 11 is connected to the sleeve 12. The blood pump 10 further comprises an inlet tube 13 connected to the distal end of the sleeve 12, and the second end 102 of the outlet tube 11 is connected to the proximal end of the sleeve 12. The blood pump 10 further comprises an impeller, a distal component 14, a driving device 15 and a catheter 16. The distal end of the driving device 15 is connected to the first end 101 of the outlet tube 11, and the proximal end of the driving device 15 is connected to the catheter 16. The impeller is located in the outlet tube 11 and is connected to the rotating shaft of the driving device 15. The proximal end of the distal component 14 is connected to the distal end of the inlet tube 13.

[0051] When the blood pump 10 is inserted into a patient's body through the skin, the inlet tube 13 and the distal part 14 of the blood pump 10 are inserted into the patient's heart chamber, the distal part 14 abuts against the inner wall of the heart chamber to position the distal end of the blood pump 10; the outlet tube 11 of the blood pump 10 is in the aorta. After the blood pump 10 is started, the driving device 15 drives the impeller to rotate, blood enters the casing 12 from the inlet tube 13, passes through the casing 12 to the outlet tube, and finally is discharged from the outlet tube 11 into the aorta.

[0052] Please refer to Figures 1-3 The outlet tube 11 of the present application comprises a tube body 100 and an outlet hole 130 provided on the tube body 100, the outlet hole 130 penetrates the inner wall surface 110 and the outer wall surface 120, and the outlet hole 130 is used for blood to pass through. It is considered that when blood passes through the outlet hole 130 of the outlet tube 11, the blood is affected by the circumferential boundary of the outlet hole 130, the blood is not easy to pass through the outlet hole 130, and the blood pumping efficiency of the blood pump 10 is low.

[0053] Please refer to Figures 4-6 To solve the above technical problems, in an embodiment of the present application, the tube body 100 of the outlet tube 11 is provided with an inner wall surface 110, an outer wall surface 120, a first end 101, a second end 102 and an outlet hole 130, the circumferential of the outlet hole 130 forms a hole wall 131 which defines the outlet hole 130, the hole wall 131 has an inner circumferential edge 131a and an outer circumferential edge 131b; the outlet tube 11 further comprises a flow guide wall 200, the flow guide wall 200 is arranged between the outer wall surface 120 and the outer circumferential edge 131b and is inclined from the outer wall surface 120 to the outer circumferential edge 131b; the flow guide wall 200 comprises a first flow guide surface 210 and a second flow guide surface 220; wherein the first flow guide surface 210 is close to the first end 101 and forms a first inclination angle θ1 with a horizontal plane S1 perpendicular to the axis direction of the tube body 100; the second flow guide surface 220 is close to the second end 102 and forms a second inclination angle θ2 with the horizontal plane S1; the first inclination angle θ1 is greater than the second inclination angle θ2, that is, θ1> θ2.

[0054] Specifically, the tube body 100 is provided in a circular tube shape, the first end 101 of the tube body 100 is provided with a first interface for sleeved connection of the driving device 15 of the blood pump 10, and the second end 102 of the tube body 100 is provided with a second interface for sleeved connection of the sleeve pipe 12 of the blood pump 10. The tube body 100 is provided with a plurality of outlet holes 130, the plurality of outlet holes 130 are arranged at intervals along the circumferential direction of the tube body 100, and a partition column 140 is formed between each adjacent two outlet holes 130. The distance from the outer periphery 131b of the outlet hole 130 to the axis L0 of the tube body 100 is less than the distance from the outer wall surface 120 of the tube body 100 to the axis L0 of the tube body 100, so that the flow guide wall 200 is inclined from the outer wall surface 120 to the outer periphery 131b, that is, the flow guide wall 200 is gradually sunken to the outer periphery 131b relative to the outer wall surface 120.

[0055] The application sets the flow guide wall 200 on the outer periphery of the outlet hole 130, so that when the blood in the outlet hole 130 contacts the circumferential boundary of the outlet hole 130, the blood can flow along the flow guide wall 200, and is guided by the flow guide wall 200 to flow out of the outlet hole 130, greatly improving the blood discharge rate and the blood pumping efficiency of the blood pump 10. The flow rate V of the blood discharged from the first flow guide surface 210 has a component V y1 in the axial direction of the tube body 100 and a component V x1 in the radial direction of the tube body 100, and the flow rate V of the blood discharged from the second flow guide surface 220 has a component V y2 in the axial direction of the tube body 100 and a component V x2 in the radial direction of the tube body. Since the first inclination angle θ1 of the first flow guide surface 210 is greater than the second inclination angle θ2 of the second flow guide surface 220, the component V y1 of the blood discharged from the first flow guide surface 210 is greater than the component V y2 of the blood discharged from the second flow guide surface 220 (i.e. V y1 > V y2 ), so that the blood flows to the first end 101 of the tube body 100, that is, to the aortic arch, in a large amount and at a high speed, effectively improving the blood pumping efficiency of the blood pump 10. It can be understood that the horizontal plane S1 is a virtual plane for describing the inclination angles of the first flow guide surface 210 and the second flow guide surface 220.

[0056] Please refer to Figure 4 , Figure 4F1 indicates the blood flow direction of the outlet tube 11 in this embodiment. In this embodiment, the outlet tube 11 is adapted for fluid to enter the interior of the outlet tube 11 from the second end 102 of the outlet tube 11 and to be discharged outwardly from the outlet aperture 130 of the outlet tube 11. That is, the blood pump 10 with the outlet tube 11 is adapted for intervention in the left ventricle. At this time, the first end 101 of the outlet tube 11 actually serves as the proximal end of the outlet tube 11, and the second end 102 of the outlet tube 11 actually serves as the distal end of the outlet tube 11; the second end 102 of the outlet tube 11 is connected to the proximal end of the cannula 12. When the left ventricle is intervened, the inlet tube 13 of the blood pump 10 extends into the left ventricle, and the outlet tube 11 is located in the artery. The blood in the left ventricle enters the blood pump 10 from the inlet tube 13 of the blood pump 10, flows to the second end 102 of the outlet tube 11 from the proximal end of the cannula 12 of the blood pump 10, then enters the interior of the outlet tube 11, and finally is discharged outwardly from the outlet aperture 130 of the outlet tube 11 to the artery. In this process, the first flow guide surface 210 can guide the blood to be discharged outwardly from the outlet aperture 130.

[0057] Please refer to Figure 20 , Figure 20 F2 indicates the blood flow direction of the outlet tube 11 in another embodiment. In another embodiment, the outlet tube 11 is adapted for fluid to enter the interior of the outlet tube 11 from the outlet aperture 130 of the outlet tube 11 and to be discharged from the second end 102 of the outlet tube 11. That is, the blood pump 10 with the outlet tube 11 is adapted for intervention in the right ventricle and is used as an inlet tube. At this time, the first end 101 of the outlet tube 11 actually serves as the distal end of the outlet tube 11, and the second end 102 of the outlet tube 11 actually serves as the proximal end of the outlet tube 11. When the right ventricle is intervened, the outlet tube 11 of the blood pump 10 extends into the right ventricle. The blood in the right ventricle enters the blood pump 10 from the outlet aperture 130 of the outlet tube 11 of the blood pump 10, flows to the second end 102 of the outlet tube 11, then enters the cannula 12 of the blood pump 10, and finally is discharged from the proximal end of the cannula 12 to the artery. In this process, the first flow guide surface 210 can guide the blood to enter the interior of the outlet tube 11 inwardly from the outlet aperture 130.

[0058] To avoid redundancy, in the following embodiments, the outlet tube 11 is mainly taken as an example for explanation and description, which is adapted for fluid to enter the interior of the outlet tube 11 from the second end 102 of the outlet tube 11 and to be discharged outwardly from the outlet aperture 130 of the outlet tube 11.

[0059] Please refer to Figure 7In an embodiment, the first flow guide surface 210 can be optionally arranged to extend along the circumferential direction of the tube body 100, so that the first flow guide surface 210 is relatively smooth, which helps to guide the blood to flow smoothly in the direction of the aortic arch. Optionally, the second flow guide surface 220 is arranged to be concave in the direction away from the first flow guide surface 210. In this way, the two ends of the first flow guide surface 210 are curved towards the first end 101 of the tube body 100, so that the blood guided out of the two ends of the second flow guide surface 220 is gradually deflected towards the first end 101 of the tube body 100, which is more likely to flow towards the aortic arch, greatly improving the blood pumping efficiency of the blood pump 10.

[0060] Further, in the circumferential direction of the tube body 100, the distance D2 between the two ends of the second flow guide surface 220 is greater than the distance D1 between the two ends of the first flow guide surface 210, i.e. D2>D1. The distance corresponds to the length in the direction of a straight line perpendicular to the axial direction. That is, the straight line length between the two ends of the second flow guide surface 220 is greater than the straight line length between the two ends of the first flow guide surface 210, so as to increase the extension length of the second flow guide surface 220, deflect more blood along the two ends of the second flow guide surface 220 towards the first end 101 of the tube body 100, and further increase the blood flow guided towards the aortic arch.

[0061] Please refer to Figures 4-6 As for the size of the first inclination angle, optionally, the first inclination angle is greater than or equal to 55° and less than or equal to 80°, i.e. 55°≤θ1≤80°; and / or, the second inclination angle is greater than or equal to 25° and less than or equal to 45°, i.e. 25°≤θ2≤45°. In the present application, “and / or” refers to “and” relationship or “or” relationship.

[0062] When the first inclination angle is less than 55°, the blood deflected out of the first flow guide surface 210 has a velocity V y1 which is close to the velocity V of the blood flowing out, and the deflection effect is not obvious; when the first inclination angle is greater than 80°, the blood is not easy to contact the first flow guide surface 210, and thus is not easy to be guided out by the first flow guide surface 210. Based on this, in the present embodiment, the first inclination angle θ1 is preferably set to 55°≤θ1≤80°, and the value of θ1 can be but is not limited to 57°, 60°, 65°, 70°, 75°, 78°.

[0063] When the second inclination angle is less than 25°, the second flow guide surface 220 is close to the vertical of the outer wall surface 120, and the second flow guide surface 220 has no obvious effect on guiding the blood outwards; when the second inclination angle is greater than 45°, the blood deflected out by the second flow guide surface 220 has a velocity V y2 which is relatively small, and thus is likely to be mixed with V y1In this embodiment, the second inclination angle θ2 is preferably set in the range of 25°≤ θ2≤ 45°, and can be but not limited to 27°, 30°, 32°, 35°, 40°, or 43°.

[0064] In yet another embodiment, the difference between the first inclination angle θ1 and the second inclination angle θ2 is greater than or equal to 27° and less than or equal to 38°, i.e. 27°≤ (θ1- θ2)≤ 38°, and can be but not limited to 28°, 30°, 32°, 35°, or 37°.

[0065] Referring to Figure 7 , Figure 10 and Figure 11 In an embodiment, each flow guide wall 200 further comprises a side flow guide surface 230 located on both sides of the outer periphery 131b, the side flow guide surface 230 is arranged in a straight surface shape and extends along the axis direction of the tube body 100, and the two ends of the side flow guide surface 230 are connected with the first flow guide surface 210 and the second flow guide surface 220 respectively. Specifically, the two side flow guide surfaces 230 of each flow guide wall 200 are located on the partition column 140 on both sides of the outlet hole 130, i.e. one side flow guide surface 230 is arranged on each side of each partition column 140. Through the two side flow guide surfaces 230, the blood can be guided to diffuse out from both sides of the outlet hole 130, reducing the influence of the boundary of the outlet hole 130 on the blood, and further increasing the rate at which the blood can be discharged from the outlet hole 130, so as to improve the blood pumping efficiency of the blood pump 10.

[0066] Referring to Figures 10-12 Optionally, the side flow guide surface 230 forms a third inclination angle θ3 with a vertical plane S2 of the tube body 100 which is perpendicular to the horizontal plane S1, and the third inclination angle θ3 is equal to the first inclination angle θ1 (i.e. θ3 = θ1); wherein the vertical plane S2 is a plane defined by the axis of the tube body 100 and the side edge of the outer periphery 131b corresponding to the side flow guide surface 230. It can be understood that the vertical plane S2 is a virtual plane used to describe the inclination angle of the side flow guide surface 230.

[0067] Since the third inclination angle θ3 is the same as the first inclination angle θ1, the flow rate of the blood guided from the side flow guide surface 230 is substantially the same as the flow rate of the blood guided from the first flow guide surface 210, so that a larger low pressure area is formed in the outer peripheral area of the tube body 100 corresponding to the first flow guide surface 210 and the side flow guide surface 230, while the outer peripheral area of the tube body 100 corresponding to the second flow guide surface 220 is a relatively high pressure area, which is conducive to driving the blood guided from the second flow guide surface 220 to flow to the low pressure area and then to the aortic arch.

[0068] Referring to Figures 7-9In an embodiment, the guide wall 200 further comprises a first corner flow surface 240 located outside the proximal corner of the outer periphery 131b, the first corner flow surface 240 being arcuately curved to smoothly connect the side flow surface 230 and the first flow surface 210; and / or the guide wall 200 further comprises a second corner flow surface 250 located outside the distal corner of the outer periphery 131b, the second corner flow surface 250 being arcuately curved to smoothly connect the side flow surface 230 and the second flow surface 220.

[0069] It can be understood that the guide wall 200 can only comprise one of the first corner flow surface 240 and the second corner flow surface 250, or can comprise both the first corner flow surface 240 and the second corner flow surface 250. In the present embodiment, the guide wall 200 comprises both the first corner flow surface 240 and the second corner flow surface 250. The two ends of the first corner flow surface 240 are respectively connected to the first flow surface 210 and the side flow surface 230, and the two ends of the second corner flow surface 250 are respectively connected to the second flow surface 220 and the side flow surface 230, so as to reduce the resistance at the corner of the outlet hole 130, facilitate the blood flowing out from the corner, and reduce the damage to the blood cells.

[0070] In addition, the inclination angle of the first corner flow surface 240 is consistent from the first flow surface 210 to the side flow surface 230, and is equal to the first inclination angle θ1 and the third inclination angle θ3, so that the two ends of the first corner flow surface 240 are respectively connected to the first flow surface 210 and the side flow surface 230. The inclination angle of the second corner flow surface 250 gradually decreases from the second flow surface 220 to the side flow surface 230, so that the second corner flow surface 250 gradually transitions from the second flow surface 220 to the side flow surface 230.

[0071] Please refer to Figures 7-9 Further, the arc length L1 of the first corner flow surface 240 is greater than the arc length L2 of the second corner flow surface 240, i.e. L1>L2. In this way, the arc of the side flow surface 230 extending along the axial direction transitions to the first flow surface 210 through the first corner flow surface 240 is relatively gentle, and the obtained flow surface area is relatively large, which is beneficial to guide the blood flowing out from the proximal side of the outlet hole 130 to flow in the direction of the aortic arch.

[0072] In an embodiment, the outer side edge of the flow guide wall 200 intersects with the outer wall surface 120 of the tube body 100; and / or, the inner side edge of the flow guide wall 200 intersects with the hole wall 131 of the outlet hole 130. Optionally, the intersection between the outer side edge of the flow guide wall 200 and the outer wall surface 120 of the tube body 100 is deburred; and / or, the intersection between the inner side edge of the flow guide wall 200 and the hole wall 131 of the outlet hole 130 is deburred. In this way, burrs can be avoided at the intersection to damage blood cells. The deburring process can generally use a file, sandpaper, grinding head, etc. as an auxiliary tool to rub off burrs, of course, high-pressure gas or fluid, ultrasonic deburring, etc. can also be used to remove burrs. This deburring method is simpler to operate and has higher production efficiency than the chamfering method.

[0073] Please refer to Figure 7 and Figure 13 In an embodiment, to ensure that the flow guide wall 200 has a better flow guiding effect, the width K of the flow guide wall 200 is greater than 2 / 3 of the thickness H of the tube body 100, and less than the thickness H of the tube body 100, i.e. 0.65H≤K<0.75H. The specific value of K can be but not limited to 0.67H, 0.68H, 0.70H, 0.72H, 0.74H, etc. As for the range of the thickness H of the tube body 100, it is optionally 0.1mm≤H≤0.25mm.

[0074] As for the connection mode of the inner periphery 131a of the outlet hole 130 and the inner wall surface 110 of the tube body 100, there are at least two embodiments. Please refer to Figure 13 In one of the embodiments, the connection between the hole wall 131 of the outlet hole 130 and the inner wall surface 110 of the tube body 100 is chamfered (such as rounded or beveled), which can reduce the damage to blood cells at the connection.

[0075] However, in this application, since the flow guide wall 200 has been provided outside the hole wall 131 of the tube body 100, if the connection between the hole wall 131 and the inner wall surface 110 of the tube body 100 is chamfered, the thickness of the outlet hole 130 around the hole wall 131 may be too thin.

[0076] Please refer to Figures 14-17In another embodiment, the hole wall 131 of the outlet hole 130 directly intersects with the inner wall surface 110 of the tube body 100, and the intersection forms an inner included angle (θ4, θ5, θ6). In this way, it is not necessary to set a chamfer at the junction of the hole wall 131 of the outlet hole 130 and the inner wall surface 110 of the tube body 100, and the thickness of the circumference of the outlet hole 130 is not too thin to weaken the rigidity of the circumference of the outlet hole 130, thereby reducing the deformation of the outlet hole 130 in the manufacturing process or after long-term flushing of blood. Alternatively, deburring treatment can also be performed on the intersection of the hole wall 131 of the outlet hole 130 and the inner wall surface 110 of the tube body 100 to avoid burrs at the intersection and avoid damaging blood cells.

[0077] Referring to Figures 15-17 Further, the inner included angle is greater than or equal to 90° and less than or equal to 120°. Specifically, in the present embodiment, the hole wall 131 includes a first side edge at the proximal end of the outlet hole 130, a second side edge at the distal end of the outlet hole 130, and a third side edge at both sides of the outlet hole 130; wherein the first side edge forms a first inner included angle θ4 with the inner wall surface 110, the second side edge forms a second inner included angle θ5 with the inner wall surface 110, and the first inner included angle θ4 and the second inner included angle θ5 are both 90°, i.e. θ4 = θ5 = 90°.

[0078] Referring to Figure 18 and Figure 19 The third side edge also forms a third inner included angle θ6 with the inner wall surface 110, and the third inner included angle θ6 is greater than the first inner included angle θ4 or the second inner included angle θ5, i.e. θ4 < θ6 ≤ 120° or θ5 < θ6 ≤ 120°.

[0079] The technical features of the above embodiments can be combined in any way. To make the description concise, not all possible combinations of the technical features in the above embodiments are described, but as long as the combinations of the technical features do not contradict, they should be considered within the scope of the present disclosure.

[0080] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the patent scope of the application. It should be noted that for ordinary skilled persons 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 patent protection scope of the present application should be subject to the appended claims.

Claims

1. An outlet tube for use in a blood pump, characterized in that The outlet tube comprises: a tube body provided with an inner wall surface, an outer wall surface, a first end, a second end and an outlet hole; the outlet tube is suitable for blood to enter the inside of the outlet tube from the second end and to be discharged outward from the outlet hole; the periphery of the outlet hole is formed with a hole wall defining the outlet hole, and the hole wall has an inner periphery and an outer periphery; and a flow guide wall arranged between the outer wall surface and the outer periphery and inclined from the outer wall surface towards the outer periphery; the flow guide wall comprises a first flow guide surface and a second flow guide surface; wherein the first flow guide surface is close to the first end and forms a first inclination angle with a horizontal plane perpendicular to the axis direction of the tube body; the second flow guide surface is close to the second end and forms a second inclination angle with the horizontal plane, and the first inclination angle is greater than the second inclination angle.

2. The outlet tube of claim 1, wherein The first inclination angle is greater than or equal to 55° and less than or equal to 80°; and / or, the second inclination angle is greater than or equal to 25° and less than or equal to 45°.

3. The outlet tube of claim 1, wherein The difference between the first inclination angle and the second inclination angle is greater than or equal to 27° and less than or equal to 38°.

4. The outlet tube of claim 1, wherein The first flow guide surface is arranged to extend along the circumferential direction of the tube body; and / or, the second flow guide surface is arranged to be recessed in a direction away from the first flow guide surface.

5. The outlet tube of claim 4, wherein, In the circumferential direction of the tube body, the distance between the two ends of the second flow guide surface is greater than the distance between the two ends of the first flow guide surface.

6. The outlet tube according to any one of claims 1 to 5, wherein the flow guide wall further comprises side flow guide surfaces located on both sides of the outer periphery, the side flow guide surfaces are arranged in a straight surface shape and extend along the axis direction of the tube body, and the two ends of the side flow guide surfaces are connected with the first flow guide surface and the second flow guide surface respectively.

7. The outlet tube of claim 6, wherein The side flow guide surface forms a third inclination angle with a vertical plane of the tube body perpendicular to the horizontal plane, and the third inclination angle is equal in size to the first inclination angle; wherein the vertical plane is a plane defined by the axis of the tube body and the side edge of the outer periphery corresponding to the side flow guide surface.

8. The outlet tube of claim 6, wherein The flow guide wall further comprises a first corner flow surface located outside the proximal corner of the outer periphery, and the first corner flow surface is arranged in an arc shape to smoothly connect the side flow guide surface and the first flow guide surface; and / or, the flow guide wall further comprises a second corner flow surface located outside the distal corner of the outer periphery, and the second corner flow surface is arranged in an arc shape to smoothly connect the side flow guide surface and the second flow guide surface.

9. The outlet tube of claim 6, wherein The flow guide wall further comprises a first corner flow surface located outside the proximal corner of the outer periphery, and the first corner flow surface is arranged in an arc shape to smoothly connect the side flow guide surface and the first flow guide surface; The flow guide wall further comprises a second corner flow surface located outside the distal corner of the outer periphery, and the second corner flow surface is arranged in an arc shape to smoothly connect the side flow guide surface and the second flow guide surface; wherein the arc length of the first corner flow surface is greater than the arc length of the second corner flow surface.

10. The outlet tube of any one of claims 1 to 5, wherein, An outer side edge of the flow guide wall intersects an outer wall surface of the tube body; and / or, an inner side edge of the flow guide wall intersects a hole wall of the outlet hole.

11. The outlet tube of any one of claims 1 to 5, wherein, A width of the flow guide wall is greater than or equal to 0.65 times a thickness of the tube body, and less than or equal to 0.75 times the thickness of the tube body.

12. The outlet tube of any one of claims 1 to 5, wherein, The hole wall of the outlet hole intersects an inner wall surface of the tube body to form an inner included angle.

13. The outlet tube of claim 12, wherein The inner included angle is greater than or equal to 90°, and less than or equal to 120°.

14. The outlet tube of any one of claims 1 to 5, wherein, The thickness H of the tube body is 0.1 mm≤H≤0.25 mm.

15. A blood pump, characterized in that, The blood pump comprises: a sleeve; and The outlet tube of any one of claims 1 to 14, wherein a second end of the outlet tube is connected to the sleeve.

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