Outlet tube and blood pump

Abstract

The invention relates to a blood pump. The blood pump comprises an outlet pipe, wherein the outlet pipe is provided with an inner wall surface, an outer wall surface and an outlet hole; the outer wall surface is positioned on 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; a hole wall for defining the outlet hole is formed on the periphery of the outlet hole; the hole wall comprises a wide inclined surface; the wide inclined surface is inclined relative to the outer wall surface and the inner 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 wide inclined surface is shielded by the outer wall surface; the wide inclined face has the extending width extending in the inclination direction of the wide inclined face, and the extending width is not smaller than 0.6 time of the thickness of the pipe wall. The blood pump can improve the blood pumping efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and particularly to an outlet tube and a blood pump. Background Art

[0002] A blood pump is a mechanical circulatory support device that draws blood from the venous system or the heart and directly pumps it into the arterial system to partially or fully replace the work of the ventricles. When the blood pump works, the blood pump drives the patient's blood to first enter the blood pump, then is accelerated by the impeller inside the blood pump, and finally is discharged from the outlet of the blood pump. However, the resistance to the discharge of blood from the outlet of the blood pump is large, resulting in a low blood pumping efficiency of the blood pump. Summary of the Invention

[0003] Based on this, the present application provides an outlet tube and a blood pump, aiming 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 on the outer periphery of the inner wall surface; the outlet tube has a wall thickness located between the inner wall surface and the outer wall surface; the outlet hole penetrates through the inner wall surface and the outer wall surface. A hole wall defining the outlet hole is formed around the circumference of the outlet hole; the hole wall includes a wide inclined surface, and the wide inclined surface is inclined with respect to both the outer wall surface and the inner wall surface; in the direction from the outside of the outlet hole along the radial direction of the outlet tube to the inside of the outlet hole, the wide inclined surface is blocked by the outer wall surface; the wide inclined surface has an extension width extending along its inclined direction, and the extension width is not less than 0.6 times the wall thickness.

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

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

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

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

[0009] a plane perpendicular to the central axis of the outlet tube is the second plane, and the distal wide inclined surface has a second inclination angle with respect to the second plane;

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

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

[0012] The second inclination angle is less than the first inclination angle;

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

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

[0015] In some embodiments, the extension width of the side-wide inclined surface is the first extension width, and the extension width of the distal-wide inclined surface is the second extension width; the first extension width is greater than the second extension width.

[0016] In some embodiments, 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 side-wide inclined surfaces. The first surface is part of the inner wall surface, the second surface is part of the outer wall surface, and the side-wide inclined surfaces are connected to the first surface and the second surface;

[0017] The width of the connecting post 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] Wherein, the minimum width is less than the first extension width; and / or, the maximum width is greater than twice the wall thickness.

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

[0020] The side-wide inclined surface has a first inner edge adjacent to the inner wall surface, and a first fillet is provided at the connection between the first inner edge and the inner wall surface;

[0021] The side-wide inclined surface has a first outer edge adjacent to the outer wall surface, and a second fillet is provided at the connection between the first outer edge and the outer wall surface;

[0022] The distal-wide inclined surface has a second inner edge adjacent to the inner wall surface, and a third fillet is provided at the connection between the second inner edge and the inner wall surface;

[0023] The distal-wide inclined surface has a second outer edge adjacent to the outer wall surface, and a fourth fillet is provided at the connection between the second outer edge and the outer wall surface.

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

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

[0026] A plurality of connecting columns, the plurality of connecting columns being connected to the proximal end of the main body and arranged at intervals along the circumferential direction of the main body, and an outlet hole being formed between two adjacent connecting columns;

[0027] Wherein, the side wide inclined surface is located on the connecting column, and the distal wide inclined surface is located at the proximal end of the main body; the proximal end of the connecting column is a free end, so as to form a clearance area at intervals between the proximal ends of two adjacent connecting columns, the clearance area being opposite to the distal wide inclined surface, and the proximal end of the connecting column can be connected and fixed to the pump housing of the blood pump.

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

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

[0030] The wall thickness is set to be 0.15 mm to 0.3 mm.

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

[0032] In some embodiments, the wide inclined surface of the outlet pipe at least includes a distal wide inclined surface, and the distal wide inclined surface is located at the distal end of the outlet hole; the impeller includes blades, the blades having outer edges, the outer edges including a distal section and a proximal section; there is a first distance between the distal section and the inner wall surface; the proximal section corresponds to the outlet hole, and there is a second distance between a part of the proximal section and the distal wide inclined surface; wherein, the second distance is greater than the first distance; and / or, the second distance is gradually increasing along the direction from the distal end to the proximal end of the outlet pipe.

[0033] For the above-mentioned outlet pipe and blood pump, by setting at least a part of the hole wall of the outlet hole as a wide inclined surface, the wide inclined surface is inclined relative to both the outer wall surface and the inner 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 pipe, the wide inclined surface is blocked by the outer wall surface, so that the wide inclined surface can be used to guide the blood to be discharged outwards from the outlet hole, reducing the resistance of blood discharge and being beneficial to blood discharge. Moreover, by setting the extension width of the wide inclined surface to be not less than 0.6 times the wall thickness of the outlet pipe, the width of the wide inclined surface can be made larger, and the wide inclined surface becomes a large inclined surface, that is, a large inclined surface is formed inside the outlet hole. In this way, the outlet hole has a large wide inclined area, which can fully guide the blood to gradually switch from axial flow along the wide inclined surface of the outlet hole to radial flow, making the resistance small, the kinetic energy loss small, and the discharge efficiency high during the whole process of blood discharge from the outlet hole, and the blood pumping efficiency of the blood pump can be improved.

[0034] Particularly, when pushing the blood pump into the patient's body, the outer surface of the outlet pipe is more likely to come into contact with the inner wall of the tissue. Therefore, when the outer surface of the existing outlet pipe is not smooth at present, deburring treatment and other processing are required, and the precision requirements for the processing are higher, and the manufacturing difficulty is greater. However, in the present application, since this large inclined surface (i.e., the wide inclined surface) is hidden inside the outlet pipe and is less likely to come into contact and friction with the inner wall of the tissue, the precision of deburring treatment and other processing for it during manufacturing can be appropriately reduced slightly; moreover, the outer surface of the outlet pipe is a smooth cylindrical surface and is not affected by this wide inclined surface, and there are fewer burrs generated during the forming process, thereby effectively reducing the manufacturing difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic structural diagram of the proximal part of the blood pump provided by an embodiment of the present application.

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

[0037] Figure 3 For Figure 1 It is a schematic structural diagram of the outlet pipe of the provided blood pump viewed from a first angle.

[0038] Figure 4 For Figure 1 It is a schematic structural diagram of the outlet pipe of the provided blood pump viewed from a second angle.

[0039] Figure 5 For Figure 4 It is a sectional view of the provided outlet pipe in the A-A direction.

[0040] Figure 6 For Figure 4 It is a sectional view of the provided outlet pipe in the B-B direction.

[0041] Figure 7 Schematic diagram of the distal part of the blood pump provided by an embodiment of the present application.

[0042] Figure 8 、 Figure 9 and Figure 10 are all Figure 6 Partial enlarged schematic diagrams at D.

[0043] Figure 11 is Figure 5 Partial enlarged schematic diagram at C.

[0044] Figure 12 is Figure 1 Longitudinal sectional view of the provided blood pump.

[0045] Figure 13 is Figure 12 Partial enlarged schematic diagram at E.

[0046] Figure 14 is Figure 1 Top view of the provided blood pump.

[0047] Figure 15 is Figure 12 Schematic diagram of the provided blood pump threaded onto a guide wire.

[0048] Figure 16 is Figure 15 Partial enlarged schematic diagram at F.

[0049] 10. Blood pump; 100. Outlet pipe; 110. Inner wall surface; 120. Outer wall surface; 130. Outlet hole; 131. Hole wall; 1311. Wide inclined surface; 131a. Side wide inclined surface; 131b. Distal wide inclined surface; 132. First fillet; 133. Second fillet; 134. Third fillet; 135. Fourth fillet; 140. Main body; 160. Connecting column; 161. First surface; 162. Second surface; 170. Clearance area; 101. Central axis; 102. Intersection line; 103. First plane; 104. Second plane; 105. Blood flow path; 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. Rotating shaft; 300. Impeller; 310. Hub; 320. Blades; 321. Outer edge; 321a. Distal section; 321b. Proximal section; 400. Catheter; 500. Cannula; 600. Inlet pipe; 610. Inlet hole; 700. Guide wire; 710. Bending part; 720. Part located outside the outlet hole. Detailed implementation manners

[0050] To make the above objects, features, and advantages of the present application more obvious and understandable, the following provides a detailed description of the specific embodiments of the present application in conjunction with the accompanying drawings. Many specific details are set forth in the following description to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0051] In the description of the present application, it should be understood that if 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, the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present application.

[0052] In addition, if terms such as "first" and "second" appear, these terms are only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0053] In the present application, unless otherwise clearly specified and limited, if terms such as "mounted", "connected", "connected to", "fixed", etc. appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0054] In this application, unless otherwise clearly specified and defined, if there is a description such as a first feature being "on" or "under" a second feature, its meaning can be 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 being "above", "over" and "on top of" the second feature can mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower horizontal height than the second feature.

[0055] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there can also 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 may be an intermediate element at the same time. If so, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are only for the purpose of illustration and do not represent the only implementation.

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

[0057] A blood pump, also known as a percutaneous interventional blood pump, is mostly used to push blood from a blood vessel into the patient's ventricle to assist the patient's heart in pumping blood from the ventricle into the artery, so as to support the patient's blood circulation. When the blood pump works, the blood pump drives the patient's blood to first enter the blood pump from the inlet of the blood pump, then flow along the axial direction of the blood pump, and finally flow radially out of the blood pump from the outlet of the blood pump to achieve 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 in the blood flow direction will cause a large loss of blood kinetic energy, increasing the difficulty of discharging the blood from the outlet of the blood pump and resulting in a low blood pumping efficiency of the blood pump.

[0058] In view of this, an embodiment of this application provides an outlet pipe and a blood pump. The outlet pipe can be applied to the blood pump to support the patient's blood circulation. Among them, the blood pump 10 can be Figure 1 the left heart interventional pump shown. Of course, in other embodiments, it can be used as a right heart interventional pump. In the accompanying drawings of the specification of this application, the arrow Y+ indicates the direction from the proximal end to the distal end, and the arrow Y- indicates the direction from the distal end to the proximal end; Figure 2The dashed arrow in [the figure] represents a schematic diagram of the blood flow in the outlet pipe 100 of the left heart interventional pump.

[0059] As Figures 1 to 3 shown, the blood pump 10 includes an outlet pipe 100, and the outlet pipe 100 has an inner wall surface 110, an outer wall surface 120, and an outlet hole 130; the inner wall surface 110 encloses a blood flow path 105; the outer wall surface 120 is located on 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 works, blood flows through the blood flow path 105 of the outlet pipe 100 and is discharged outwards from the outlet hole 130.

[0060] As Figures 3 to 6 shown, the outlet holes 130 are provided in plurality, and the plurality of outlet holes 130 are arranged at intervals along the circumferential direction of the outlet pipe 100. Optionally, the plurality of outlet holes 130 are evenly arranged at intervals along the circumferential direction of the outlet pipe 100. By arranging the plurality of outlet holes 130 evenly, it can be ensured that the blood is discharged from the outlet pipe 100 evenly along the circumferential direction of the outlet pipe 100. Regarding the number of the outlet holes 130, it can be set to 2, 3, 4, 5, 6 or more, without specific limitation, as long as it does not affect the strength of the outlet pipe 100 and the smooth discharge of the blood.

[0061] The blood pump 10 further includes an impeller 300, and the impeller 300 is rotatably arranged in the blood flow path 105 inside the outlet pipe 100. By driving the impeller 300 to rotate, it can be made that the blood flows through the blood flow path 105 of the outlet pipe 100 and is discharged outwards from the outlet hole 130. The impeller 300 includes a hub 310 and a plurality of blades 320 arranged on the hub 310. The number of the blades 320 can be 2, 3 or 4.

[0062] The blood pump 10 further includes a motor 200, and the distal end of the motor 200 is fixedly connected to the proximal end of the outlet pipe 100, and the motor 200 is fixedly connected to the impeller 300 to drive the impeller 300 to rotate through the motor 200. In this embodiment, the motor 200 is an in-vivo motor and can be pushed into the blood vessel along with the outlet pipe 100. In other embodiments, the motor 200 can also be an external motor, that is, the motor 200 is placed outside the body, and the motor 200 is connected to the impeller 300 through a flexible shaft so that the motor 200 drives the impeller 300 to rotate through the flexible shaft.

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

[0064] In some embodiments, a hole wall 131 defining the outlet hole 130 is formed circumferentially around the outlet hole 130. The hole wall 131 includes a wide inclined surface 1311 that is inclined with respect to both the outer wall surface 120 and the inner wall surface 110; in the direction from the outside of the outlet hole 130 along the radial direction of the outlet pipe 100 to the inside of the outlet hole 130 (i.e., Figure 6 the direction indicated by the arrow S), the wide inclined surface 1311 is blocked by the outer wall surface 120. Generally speaking, 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 wide inclined surface 1311 is blocked by the outer wall surface 120, so that the wide inclined surface 1311 cannot be seen, making the wide inclined surface 1311 hidden inside the outlet pipe 100.

[0065] By setting at least a part of the hole wall 131 of the outlet hole 130 as the wide inclined surface 1311, the wide inclined surface 1311 is inclined with respect to both the outer wall surface 120 and the inner wall surface 110, and in the direction from the outside of the outlet hole 130 along the radial direction of the outlet pipe 100 to the inside of the outlet hole 130, the wide inclined surface 1311 is blocked by the outer wall surface 120. The wide inclined surface 1311 can be used to guide the blood to flow outwards from the blood flow path 101, reducing the resistance of blood discharge and being beneficial to blood discharge.

[0066] As Figure 8 shown, the outlet pipe 100 also has a wall thickness H 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 inclined direction, and the extension width L is not less than 0.6 times the wall thickness H of the outlet pipe 100, 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 made larger, and the wide inclined surface 1311 becomes a large inclined surface, that is, a large inclined surface is formed inside the outlet hole 130. In this way, 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, making the resistance small during the whole process of blood discharging from the outlet hole 130, with small kinetic energy loss and high discharging efficiency, and can improve the blood 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 tube 100 is more likely to come into contact with the inner wall of the tissue. Therefore, when the outer surface of the existing outlet tube is not smooth, deburring and other processing are required, and the precision requirements for the processing are higher, making the manufacturing difficult. In this application, since the large inclined surface (i.e., the wide inclined surface 1311) is hidden inside the outlet tube 100 and is less likely to come into contact with and rub against the inner wall of the tissue, the precision of deburring and other processing during manufacturing can be appropriately reduced slightly. Moreover, the outer surface of the outlet tube 100 is a smooth cylindrical surface and is not affected by the wide inclined surface 1311, so there are fewer burrs generated during the forming process, effectively reducing the manufacturing difficulty.

[0068] It can be understood that the extension width L of the wide inclined surface 1311 cannot be blindly increased in order to increase the wide inclined area of the outlet hole 130. If the extension width L of the wide inclined surface 1311 is too large, as Figure 8 shown, it may reduce the cross-sectional area of the part between two adjacent outlet holes 130 in the outlet tube 100 (i.e., the connecting column 160 mentioned below), perhaps weakening the strength of the connecting column 160 of the outlet tube 100. In this regard, this application also limits the maximum value of the extension width L of the wide inclined surface 1311. Specifically, L ≤ 1.3H. Preferably, 0.8H ≤ L ≤ 1.1H. With the extension width L of the wide inclined surface 1311 within this range of values, it can effectively guide the flow direction of the blood, avoid excessive kinetic energy loss, and effectively ensure the strength of the outlet tube 100. In addition, it can also prevent the connection between the wide inclined surface 1311 and the outer wall surface 120 of the outlet tube 100 from being too sharp. It should be noted that Figure 8 the thick dashed line in

[0069] represents the wide inclined surface 1311 with a larger extension width L. When designing the blood pump 10, the wall thickness H of the outlet tube 100 also needs to be limited. Specifically, the wall thickness H of the outlet tube can be set to 0.15 mm to 0.3 mm. For example, H can be 0.15 mm, 0.17 mm, 0.18 mm, 0.19 mm, 0.21 mm, 0.23 mm, 0.25 mm, 0.27 mm, 0.3 mm, etc. If the wall thickness H of the outlet tube 100 is too small, the extension width L of the wide inclined surface 1311 will be small, resulting in a small wide inclined area of the outlet hole 130, and it cannot fully guide the blood to gradually switch from axial flow along the wide inclined surface 1311 of the outlet hole 130 to radial flow, and cannot effectively improve the blood pumping efficiency of the blood pump 10. If the wall thickness H of the outlet tube 100 is too large, the overall radial size of the blood pump 10 will be too large, increasing the delivery difficulty of the blood pump 10 in the patient's body.

[0070] As Figures 12 to 16As shown, it is considered here that when the guide wire 700 is used to assist the blood pump 10 to be pushed to the target position in the patient's body, after the guide wire 700 enters the blood flow path 105 of the outlet pipe 100, the guide wire 700 generally passes through the blade gap between the two blades 320 of the impeller 300, and then bends radially outward at a distal position adjacent to the outlet hole 130 and passes through the outlet hole 130. The portion 720 of the guide wire 700 located outside the outlet hole 130 will extend close to the outer surface of the motor 200 to the outside of the body. The bent portion 710 of the guide wire 700 may contact the distal end of the outlet hole 130 and be worn.

[0071] In view of this, in order to reduce the occurrence of the above situation, in some embodiments of the present application, the wide inclined surface 1311 at least includes a distal wide inclined surface 131b, and the distal wide inclined surface 131b is located at the distal end of the outlet hole 130. Due to the existence of the distal wide inclined surface 131b, when the guide wire 700 passes through the outlet hole 130, the distal wide inclined surface 131b of the outlet hole 130 can avoid the bent portion 710 of the guide wire 700 (see Figure 15 and Figure 16 ), the bent portion 710 of the guide wire 700 is not easily in contact with the distal wide inclined surface 131b, thereby reducing the contact friction between the guide wire 700 and the distal end of the outlet hole 130 and avoiding the wear of the bent portion 710 of the guide wire 700. When the blood pump 10 is pushed, the blood pump 10 moves relative to the guide wire 700 in the Y+ direction. Even if the connection between the distal wide inclined surface 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 blood flow path 105 of the outlet pipe 100 in the Y- direction, when the blood approaches the distal end of the outlet hole 130, the blood first contacts the distal wide inclined surface 131b, so that most of the blood can be guided to be discharged from the outlet hole 130 along the inclined direction of the distal wide inclined surface 131b.

[0073] See Figures 12 to 14 , optionally, the blade 320 of the impeller 300 has an outer edge 321, and the outer edge 321 includes a connected distal segment 321a and a proximal segment 321b; there is a first spacing K along the radial direction between the distal segment 321a and the inner wall surface 110 1 , the existence of the first spacing K 1 can enable the impeller 300 to rotate stably in the blood flow path 105 without contacting the inner wall surface 110 and causing interference. The outer edge 321 of the blade 320 is an arc shape that bends and extends in the circumferential direction around the hub 310 from the proximal end to the distal end of the impeller 300, such as an exponentially tapered arc shape or an arc shape of a Bezier curve.

[0074] Further, the proximal segment 321b of the outer edge 321 is radially opposite to the outlet hole 130. A part of the proximal segment 321b is radially opposite to the distal wide inclined surface 131b and has a second spacing K in the radial direction of the outlet pipe 100. 2 ; The second spacing K 2 is greater than the first spacing K 1 , that is, K 2 > K 1 . During the process of pushing the blood pump 10, relative movement may occur between the guide wire 700 and the outlet pipe 100. When the guide wire 700 moves into the space between the proximal segment 321b of the blade 320 and the distal wide inclined surface 131b, due to the larger second spacing K 2 , the guide wire 700 is not easily clamped by the proximal segment 321b and the distal wide inclined surface 131b, and the guide wire 700 can easily move out of the space between the proximal segment 321b and the distal wide inclined surface 131b, ensuring that the blood pump 10 can be smoothly pushed along the guide wire 700 to the target position.

[0075] Wherein the second spacing K 2 is gradually increasing in the direction from the distal end to the proximal end of the outlet pipe 100. At this time, the minimum value of the second spacing K on the side of the distal wide inclined surface 131b close to the inner wall surface 110 2 is greater than the first spacing K 1 . Such a setting can not only prevent the guide wire 700 from being clamped by the proximal segment 321b and the distal wide inclined surface 131b; but also be beneficial to the impeller 300 to drive the blood to be discharged quickly.

[0076] As Figure 3 shown, the wide inclined surface 1311 further includes a side wide inclined surface 131a; the side wide inclined surface 131a extends along the axial direction of the outlet pipe 100 and is located on one side of the outlet hole 110. The distal end of the side wide inclined surface 131a is smoothly connected to one end of the distal wide inclined surface 131b. The side wide inclined surface 131a is an inclined plane. Optionally, there are two side wide inclined surfaces 131a, and the two side wide inclined surfaces 131a are arranged at intervals in the circumferential direction of the outlet pipe 100 on both sides of the outlet hole 130; the distal ends of the two side wide inclined surfaces 131a are respectively connected to both ends of the distal wide inclined surface 131b. Arranging the wide inclined surface 1311 in this way can maximize the wide inclined area of the outlet hole 130, and 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, so that the resistance of the whole process of the blood discharging from the outlet hole 130 is the smallest, and the blood pumping efficiency of the blood pump 10 can be effectively improved.

[0077] It can be understood that only one of the side wide inclined surface 131a and the distal wide inclined surface 131b may exist.

[0078] As Figure 5 ,Figure 10 and Figure 11 As shown in Figure 11 , the side-wide inclined surface 131a intersects with the inner wall surface 110 of the outlet pipe 100 to form an intersection line 102. The plane where the intersection line 102 and the central axis 101 of the outlet pipe 100 are coplanar is the first plane 103. There is a first inclination angle α between the side-wide inclined surface 131a and the first plane 103. Here, it is considered that if the first inclination angle α is too small, the area of the side-wide inclined surface 131a may be too small to sufficiently guide the blood to gradually switch from axial flow along the wide inclined surface 1311 of the outlet hole 130 to radial flow. If the first inclination angle α is too large, the connection between the side-wide inclined surface 131a and the outer wall surface 120 of the outlet pipe 100 may be too sharp. In view of this, the size of the first inclination angle α is studied and designed, and it is obtained that when the first inclination angle α is set to 35° - 65°, the area of the side-wide inclined surface 131a can be relatively large; at the same time, it is ensured that the connection between the side-wide inclined surface 131a and the outer wall surface 120 of the outlet pipe 100 is not too thin, and the situation of brittle fracture occurs less frequently. The first inclination angle α can specifically be set to 35°, 40°, 45°, 55°, 60°, 65°, etc.

[0079] As Figure 5 and Figure 11 shown in Figure 11 , the plane perpendicular to the central axis 101 of the outlet pipe 100 is the second plane 104. There is a second inclination angle β between the distal-wide inclined surface 131b and the second plane 104. Here, it is considered that if the second inclination angle β is too small, the area of the distal-wide inclined surface 131b may be too small to sufficiently guide the blood to gradually switch from axial flow along the wide inclined surface 1311 of the outlet hole 130 to radial flow. If the second inclination angle β is too large, the connection between the distal-wide inclined surface 131b and the outer wall surface 120 of the outlet pipe 100 may be relatively thin, which may cause scratching to the guide wire 700 (as shown in Figure 15 and Figure 16 ). In view of this, the size of the second inclination angle β is studied and designed, and it is obtained that when the second inclination angle β is set to 35° - 65°, the area of the distal-wide inclined surface 131b can be relatively large; at the same time, it is ensured that the connection between the distal-wide inclined surface 131b and the outer wall surface 120 of the outlet pipe 100 is not too thin, and the situation of scratching the guide wire 700 can be reduced to a large extent. The second inclination angle β can specifically be set to 35°, 40°, 45°, 55°, 60°, 65°, etc. Of course, in some other embodiments, only the first inclination angle α or the second inclination angle β is set to 35° - 65°.

[0080] Among them, as Figure 3 ​​​​As shown, the distal wide inclined surface 131b is set to be recessed in an arcuate shape relative to the distal end of the outlet tube 100. This allows for a smooth transition between the two ends of the distal wide inclined surface 131b and the distal ends of the two side wide inclined surfaces 131a respectively. In this way, stress concentration at the connection between the distal wide inclined surface 131b and the side wide inclined surface 131a can be avoided, thereby preventing the outlet tube 100 from cracking under blood flushing. Additionally, dead ends at the connection between the distal wide inclined surface 131b and the side wide inclined surface 131a can be avoided, facilitating blood drainage.

[0081] When the outlet tube 100 is processed by an integral molding method, since the distal wide inclined surface 131b is a concave arc surface with a certain curvature, the molding of the distal wide inclined surface 131b is difficult. In view of this, in the present application, the molding difficulty of the distal wide inclined surface 131b is reduced by decreasing the second inclination angle β of the distal wide inclined surface 131b. Specifically, the second inclination angle β is less than the first inclination angle α, that is, β < α. By setting the second inclination angle β of the distal wide inclined surface 131b to be less than the first inclination angle α of the side wide inclined surface 131a, not only can the molding difficulty of the distal wide inclined surface 131b be reduced, facilitating the processing and production of the outlet tube 100, but also the sharpness at the connection between the distal wide inclined surface 131b and the outer wall surface 120 of the outlet tube 100 can be avoided, reducing the friction between the connection between the distal wide inclined surface 131b and the outer wall surface 120 of the outlet tube 100 and the guide wire 700.

[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 magnitudes of α and β in this way, on the premise of β < α, the areas of the side wide inclined surface 131a and the distal wide inclined surface 131b can be ensured to be the largest, and the probability of hemolysis can also be effectively reduced.

[0083] Since the axial dimension of the outlet tube 100 is relatively large and the side wide inclined surface 131a extends along the axial direction of the outlet tube 100, the wide inclined area of the outlet hole 130 can also be effectively increased by increasing the size of the side wide inclined surface 131a. Specifically, in some embodiments of the present application, the extension width of the side wide inclined surface 131a is the first extension width L 1 , and the extension width of the distal wide inclined surface 131b is the second extension width L 2 , then, L 1 > L 2 . By making the first extension width L of the side wide inclined surface 131a 1Set to be larger than the second extension width L of the distal wide inclined surface 131b, which can increase the area of the side wide inclined surface 131a. Among them, as 2 shown, 0.7H ≤ L Figure 10 ≤ 1.3H, preferably, 0.8H ≤ L 1 ≤ 1.1H; as 1 shown, 0.7H ≤ L Figure 11 ≤ 1.3H, preferably, 0.8H ≤ L 2 ≤ 1.1H. 2

[0084] In some embodiments of the present application, the wide inclined surface 131 has an inner edge and an outer edge. The inner edge is connected to the inner wall surface 110, and the outer edge is connected to the outer wall surface 120. Among them, fillets are provided at both the connection of the inner edge and the inner wall surface 110 and the connection of the outer edge and the outer wall surface 120. The setting of the fillets can prevent the connections between the inner edge and the inner wall surface 110 and between the outer edge and the outer wall surface 120 from being too sharp, and can reduce the probability of hemolysis. Of course, in some other embodiments, fillets are provided only at the connection of the inner edge and the inner wall surface 110 or at the connection of the outer edge and the outer wall surface 120.

[0085] Specifically, as Figure 10 shown, the side wide inclined surface 131a has a first inner edge adjacent to the inner wall surface 110, and a first fillet 132 is provided at the connection of the first inner edge and the inner wall surface 110 of the outlet pipe 100. The setting of the first fillet 132 can prevent the connection between the side wide inclined surface 131a and the inner wall surface 110 of the outlet pipe 100 from being too sharp, and can reduce the probability of hemolysis.

[0086] The side wide inclined surface 131a further has a first outer edge adjacent to the outer wall surface 120, and a second fillet 133 is provided at the connection of the first outer edge and the outer wall surface 120 of the outlet pipe 100. The setting of the second fillet 133 can prevent the connection between the side wide inclined surface 131a and the outer wall surface 120 of the outlet pipe 100 from being too sharp, can avoid harm to the patient, and can also reduce the probability of hemolysis.

[0087] As Figure 11 shown, the distal wide inclined surface 131b has a second inner edge adjacent to the inner wall surface 110, and a third fillet 134 is provided at the connection of the second inner edge and the inner wall surface 110 of the outlet pipe 100. The setting of the third fillet 134 can prevent the connection between the distal wide inclined surface 131b and the inner wall surface 110 of the outlet pipe 100 from being too sharp, and can reduce the probability of hemolysis.

[0088] The distal wide inclined surface 131b also has a second outer edge adjacent to the outer wall surface 120, and a fourth rounded corner 135 is provided at the connection between the second outer edge and the outer wall surface 120 of the outlet pipe 100. The setting of the fourth rounded corner 135 can avoid the connection between the fourth wide inclined surface 1311 and the outer wall surface 120 of the outlet pipe 100 from being too sharp, which can avoid harm to the patient and also avoid abrasion of the guide wire 700.

[0089] In some embodiments of the present application, as Figure 3 shown, a connecting column 160 is formed between every two adjacent outlet holes 130 of the outlet pipe 100; as Figure 10 shown, the connecting column 160 has a first surface 161, a second surface 162 and two side wide inclined surfaces 131a. The first surface 161 faces the central axis 101 of the outlet pipe 100, the second surface 162 faces away from the first surface 161, and the side wide inclined surfaces 131a are connected to the first surface 161 and the second surface 162; 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 change of 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 can be made to gradually increase 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 shows the rule of being larger inside and smaller outside. In this way, it can play a better guiding role in the discharge of blood and improve the discharge efficiency of blood.

[0090] Among them, as Figure 8 shown, the connecting column 160 has a minimum width L on the first surface 161 min , then, L min <L 1 , for example, L min =0.9L 1 , L min =0.8L 1 , L min =0.7L 1 , L min =0.6L 1 , L min =0.5L 1 etc. By setting the first extension width L 1 of the side wide inclined surface 131a to be greater than the minimum width L min of the connecting column 160, the first extension width L 1 of the side wide inclined surface 131a can be increased, so that the wide inclined area of the outlet hole 130 can be increased, and the discharge efficiency of blood can be improved.

[0091] As Figure 8 shown, the connecting column 160 has a maximum width L on the second surface 162max , then L max > 2H. For example, L max = 2.1H, L max = 2.2H, L max = 2.3H, L max = 2.4H, L max = 2.5H, etc. By defining the maximum width L of the connecting column 160 in this way max and the size relationship between the wall thickness H of the outlet pipe 100, the inclination angle of the side-wide inclined surface 131a can be increased, and the first extension width L of the side-wide inclined surface 131a can be increased 1 , thereby increasing the wide-inclined area of the outlet hole 130 and improving the blood discharge efficiency.

[0092] Such as Figure 6 , Figure 8 and Figure 9 shown, passing through the midpoint P min of the minimum width L 1 and the midpoint P max of the maximum width L 2 , the radial plane is the third plane 106. The two side-wide inclined surfaces 131a located on the same connecting column 160 are symmetric about the third plane 106. The planes where the two side-wide inclined surfaces 131a are located have an included angle θ, and the included angle θ can be set to 80° - 100°, that is, 80° ≤ θ ≤ 100°. Such as the included angle θ is set to 82°, 85°, 90°, 95°, 100°, etc. In this way, the two side-wide inclined surfaces 131a of the connecting column 160 can guide the blood to be evenly split and discharged to the outlet holes 130 on both sides of the connecting column 160, reducing the occurrence of blood turbulence.

[0093] For the convenience of pushing the blood pump 10 in the patient's body, the outlet pipe 100 is generally set to a circular tube shape similar to the blood vessel structure. As a 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 can both be correspondingly set as arc surfaces, where the first surface 161 belongs to a part of the inner wall surface 110; the second surface 162 belongs to a part of the outer wall surface 120. Setting the connecting column 160 in this way can not only reduce the pushing difficulty of the blood pump 10 in the patient's body, avoid the inner and outer wall surfaces of the pump shell having sharp corners, prevent damage to the blood vessels, but also reduce the probability of hemolysis. Of course, in some other embodiments, only the second surface 162 on the outside of the connecting column 160 or the first surface 161 on the inside can be set as an arc surface.

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

[0095] Specifically, in one embodiment, such asFigure 3 As shown, 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 that are opposite to each other 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 an outlet hole 130 is formed between two adjacent connecting columns 160. Among them, the side-wide inclined surface 131a is located on the connecting column 160, and the distal-wide inclined surface 131b is located at the proximal end of the main pipe body 140. The outlet pipe 100 with this structure is simple in structure, facilitating the formation of the outlet hole 130 on the outlet pipe 100, and is beneficial to the production and processing of the outlet pipe 100.

[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 to the pump housing of the blood pump 10. A clearance area 170 is formed at intervals between the proximal ends of two adjacent connecting columns 160. By setting it like this, it can be ensured that 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-wide inclined surface 131b are inclined inward relative to the central axis 101 of the outlet pipe 100, that is, the side-wide inclined surface 131a and the distal-wide inclined surface 131b are located inside the outlet hole 130, it is difficult to form them by secondary processing, that is, first process the outlet pipe 100, and then process the inclined side-wide inclined surface 131a and distal-wide inclined surface 131b on the hole wall 131 of the outlet hole 130. Therefore, it is suitable to adopt an integral molding method, such as casting or 3D printing. After molding, it is also necessary to deburr the connection between the wide inclined surface 1311 and the inner and outer wall surfaces 120 of the outlet pipe 100. If cylindrical pipe bodies are provided at both axial ends of the connecting column 160, it will increase the molding difficulty and interfere with the subsequent deburring operation process; on the contrary, if the end of the connecting column 160 away from the main pipe body 140 is not provided with a cylindrical pipe body and a clearance area 170 is formed, the difficulty of molding and subsequent processes such as deburring can be reduced.

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

[0098] As Figure 1As shown, the distal end cap 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. The outer peripheral surface 212a is connected to the proximal end of the connecting column 160. The distal end cap 212 also has a through hole penetrating the top surface 212b, and the through hole is for the rotating shaft 240 of the motor 200 to pass through. Since the proximal end of the connecting column 160 is connected to the outer peripheral surface 212a of the distal end cap 212, the top surface 212b and the arc convex surface 212c of the distal end cap 212 extend into the outlet pipe 100 and correspond to the outlet hole 130. This enables the blood to contact the top surface 212b and the arc convex surface 212c of the distal end cap 212 when discharging from the outlet hole 130. In this regard, in the present application, by setting the transition surface between the outer peripheral surface 212a and the top surface 212b of the distal end cap 212 as the arc convex surface 212c, it can also play a guiding role in the discharge of blood and improve the discharge efficiency of blood.

[0099] In summary, for the outlet pipe 100 provided by the present application and the blood pump 10 having the outlet pipe 100, by setting at least a part of the hole wall 131 of the outlet hole 130, that is, the wide inclined surface 1311, to be inclined radially inward along the outlet pipe 100 towards the blood flow channel 105 and the projection of the outer wall surface 120 on the longitudinal plane where the central axis of the outlet pipe 100 is located covers the wide inclined surface 1311, it can play a guiding role in the discharge of blood. Also, 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, that is, L≥0.6H, the width of the wide inclined surface 1311 can be made larger. In this way, the outlet hole 130 has a larger wide 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, making the resistance smaller, the kinetic energy loss smaller, and the discharge efficiency higher during the whole process of blood discharging from the outlet hole 130, and improving the blood pumping efficiency of the blood pump 10.

[0100] Particularly, when pushing the blood pump 10 into the patient's body, the outer surface of the outlet pipe 100 is more likely to contact the inner wall of the tissue. Therefore, when the outer surface of the outlet pipe 100 is not smooth, deburring treatment and other processing are required, and the processing accuracy requirements are higher, and the manufacturing difficulty is greater. In the present application, since this large inclined surface (i.e., the wide inclined surface 1311) is hidden inside the outlet pipe 100 and is less likely to contact and rub against the inner wall of the tissue, the accuracy of deburring treatment and other processing for it during manufacturing can be appropriately slightly reduced; moreover, the outer surface of the outlet pipe 100 is a smooth cylindrical surface and is not affected by the wide inclined surface 1311, and there are fewer burrs generated during the forming process, thereby effectively reducing the manufacturing difficulty.

[0101] As Figure 1As shown, in some embodiments of the present application, the motor 200 of the blood pump 10 includes a housing 210 (i.e., the pump housing mentioned above), a stator 220, a rotor 230, and a rotating 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 catheter 400. The stator 220 is disposed in the housing 210, and the rotor 230 and the stator 220 are arranged axially. The rotating shaft 240 rotatably passes through the stator 220; the rotating shaft 240 is fixedly connected to the rotor 230; the distal end of the rotating shaft 240 extends into the outlet pipe 100 to be fixedly connected to the impeller 300. When the stator 220 operates, it can generate a rotating magnetic field that causes the rotor 230 to rotate. The rotor 230 then drives the rotating shaft 240 to rotate under this rotating magnetic field, and the impeller 300 also rotates accordingly.

[0102] As Figure 1 shown, the proximal end of the housing 210 of the motor 200 includes a main housing 211 and a distal cover 212 connected to the distal end of the main housing 211. The distal cover 212 is fixedly connected to the connecting column 160 of the outlet pipe 100. The housing 210 may further include a proximal cover 213, and the proximal cover 213 is fixedly connected to the distal end of the catheter 400.

[0103] As Figure 7 shown, the blood pump 10 further includes an intubation 500 and an inlet pipe 600. The intubation 500 is fixedly connected to the distal end of the outlet pipe 100 and the proximal end of the inlet pipe 600. The inlet pipe 600 has an inlet hole 610 through which blood flows into the blood pump 10. The materials of the outlet pipe 100 and the inlet pipe 600 may be biocompatible metal materials, such as titanium alloy and 316L steel; the intubation 500 may be a flexible shell tube that can be bent.

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

[0105] It can be understood that the inlet pipe 600 is not necessary. For example, an inlet hole can be directly opened at the distal end of the intubation tube 500. Of course, the intubation tube 500 is not necessary either. For example, when the blood pump 10 is used as a right heart interventional pump, considering the characteristics of right ventricular stenosis, an outlet hole 130 can be provided at the distal end of the outlet pipe 100, and an inlet hole can be provided at the proximal end of the outlet pipe 100 to be applicable to the stenotic right ventricle. The blood pump 10 pushes blood from the right ventricle to the pulmonary artery, and the inlet hole of the blood pump 10 is located within the right ventricle, while the outlet hole 130 is located within the pulmonary artery. Among them, the outlet pipe 100 can be a straight pipe with a shorter length. It can be understood that the structures of the right heart interventional pump and the left heart interventional pump can also be the same.

[0106] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered to be within the scope described in this specification.

[0107] The above-described embodiments only represent several implementation manners of the present application. The description is relatively specific and detailed, but it cannot be understood as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection 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, which is used for a blood pump inserted percutaneously into a patient's body, characterized in that: The outlet pipe has: inner wall surface; an outer wall surface, the outer wall surface being located at the outer periphery of the inner wall surface; the outlet pipe having a pipe wall thickness located between the inner wall surface and the outer wall surface; and An outlet hole, the outlet hole passes through the inner wall surface and the outer wall surface, and a hole wall defining the outlet hole is formed around the outlet hole; the hole wall includes a wide bevel, and the wide bevel is inclined relative to the outer wall surface and the inner wall surface; From the outside of the outlet hole along the radial direction of the outlet pipe to the inside of the outlet hole, the wide slope is blocked by the outer wall surface; the wide slope has an extension width extending along its inclination direction, and the extension width is not less than 0.6 times the thickness of the tube wall.

2. The outlet pipe according to claim 1, characterized in that The wide slope comprises: a distal wide bevel, the distal wide bevel being located at the distal end of the outlet hole; and The two side wide slopes are located on both sides of the distal wide slope, and the side wide slopes extend along the axial direction of the outlet pipe, and the distal ends of the side wide slopes are smoothly connected to the distal wide slope.

3. The outlet pipe according to claim 2, characterized in that The side wide inclined surface intersects with the inner wall surface to form an intersection line, a plane coplanar with the intersection line and the central axis of the outlet pipe is a first plane, and a first inclination angle is formed between the side wide inclined surface and the first plane; A plane perpendicular to the central axis of the outlet pipe is a second plane, and a second inclination angle exists between the distal wide inclined surface and the second plane; At least one of the first inclination angle and the second inclination 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 features: The second inclination angle is smaller than the first inclination angle; The first inclination angle is set to 35°~50°; The second inclination angle is set to 45°~60°.

5. The outlet pipe according to claim 2, characterized in that: The extension width of the side wide inclined surface is a first extension width, and the extension width of the distal wide inclined surface 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 column located between two adjacent outlet holes, the connecting column having a first surface, a second surface and two side wide inclined surfaces, the first surface is a part of the inner wall surface, the second surface is a part of the outer wall surface, and the side wide inclined surface is connected to 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 smallest width on the first surface and the largest width on the second surface; wherein the minimum width is smaller than the first extension width; And / or, the maximum width is greater than twice the thickness of the tube wall.

7. The outlet pipe according to claim 2, characterized in that The outlet pipe also has at least one of the following features: The side wide inclined surface has a first inner edge adjacent to the inner wall surface, and a first rounded corner is provided at the connection between the first inner edge and the inner wall surface; The side wide inclined surface 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 bevel surface 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 bevel has a second outer edge adjacent to the outer wall, and a fourth rounded corner is provided at a connection between the second outer edge and the outer wall.

8. The outlet pipe according to claim 2, characterized in that The outlet pipe comprises: a main body having a distal end and a proximal end; and A plurality of connecting posts, wherein the plurality of connecting posts are connected to the proximal end of the main pipe body and are arranged at intervals along the circumference of the main pipe body, and the outlet hole is formed between two adjacent connecting posts; Among them, the side wide bevel is located on the connecting column, and the distal wide bevel is located at the proximal end of the main pipe body; the proximal end of the connecting column is a free end, so as to form an escape zone between the proximal ends of two adjacent connecting columns, and the escape zone is opposite to the distal wide bevel. The proximal end of the connecting column can be connected and fixed to 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 features: The extension width is less than or equal to 1.3 times the thickness of the tube wall; The tube wall thickness is set to 0.15 mm to 0.3 mm.

10. A blood pump, characterized in that: The blood pump comprises an impeller and an outlet tube as claimed in any one of claims 1 to 9; the impeller is rotatably disposed in the outlet tube.

11. The blood pump according to claim 10, characterized in that The wide bevel of the outlet pipe at least includes a distal wide bevel, and the distal wide bevel is located at the distal end of the outlet hole; The impeller comprises a blade, the blade has an outer edge, the outer edge comprises 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 hole, and a part of the proximal section is spaced apart from the distal wide bevel surface by a second distance; Wherein, the second spacing is greater than the first spacing; and / or, the second spacing is arranged to gradually increase in the direction from the distal end to the proximal end of the outlet pipe.

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