Outlet tube, cannula assembly and blood pump

Abstract

The invention relates to an outlet tube, a cannula assembly and a blood pump. The outlet pipe comprises a pipe body and a plurality of supporting columns; the tube body is provided with an inner circumferential surface and an outer circumferential surface, and a tube cavity is defined by the inner circumferential surface; the multiple supporting columns are connected with the near end of the catheter body, the multiple supporting columns extend in the axial direction of the catheter body and are arranged in the circumferential direction of the catheter body at intervals, a blood outlet is formed between every two adjacent supporting columns in a spaced mode, and the blood outlets communicate with the catheter cavity. Each supporting column is provided with a cross section perpendicular to the central axis of the outlet pipe, and the cross section of at least one supporting column is at least one of a circular cross section and an oval cross section, so that the circumferential face of each supporting column is a smooth surface. According to the outlet pipe, hemolysis can be reduced, and the blood hemolysis risk is reduced.

Description

Technical Field

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

[0002] A blood pump is a blood pump that can be percutaneously inserted into the patient's heart, and is mainly used to assist the patient's blood circulation. The blood pump has an outlet tube with multiple blood outlets. When the blood pump is working, the blood drives the patient's blood into the blood pump first, then accelerates through the impeller drive in the blood pump, and finally is discharged from the outlet tube of the blood pump. However, there are pillars between two adjacent blood outlets of the outlet tube, and these pillars have many sharp angles or sharp edges. In the process of blood being discharged from the blood outlet, the blood contacts and collides with the sharp angles or sharp edges of the pillars, which is prone to hemolysis problems. Summary of the invention

[0003] Based on this, it is necessary to provide an outlet tube capable of reducing hemolysis and a cannula assembly and a blood pump having the outlet tube to address the above-mentioned problem, so as to reduce the occurrence of hemolysis and reduce the risk of blood hemolysis.

[0004] In one embodiment of the present application, the outlet tube includes a tube body and a plurality of struts; the tube body has an inner circumferential surface and an outer circumferential surface, the inner circumferential surface encloses a lumen; the plurality of struts are connected to the proximal end of the tube body, the plurality of struts extend along the axial direction of the tube body, and are arranged at intervals along the circumference of the tube body, and a blood outlet is spaced between two adjacent struts, and the blood outlet is connected to the lumen. The struts have a cross section perpendicular to the central axis of the outlet tube, and the cross section of at least one of the struts is at least one of a circular cross section and an elliptical cross section, so that the circumferential surface of the strut is a smooth surface.

[0005] In some embodiments, the cross section of the pillar is a circular cross section; the diameter of the pillar is greater than or equal to the wall thickness of the tube body.

[0006] In some embodiments, the ratio of the diameter of the pillar to the wall thickness of the tube body is 1.15 to 1.35.

[0007] In some embodiments, the cross section of the pillar is an elliptical cross section; the elliptical cross section has a short axis in the radial direction of the outlet pipe and a long axis perpendicular to the short axis, and the long axis is larger than the short axis.

[0008] In some embodiments, the minor axis is greater than or equal to the wall thickness of the tube body; and / or the ratio of the major axis to the minor axis is 1.5-3.

[0009] In some embodiments, the circumferential surface of the pillar includes an inner portion facing the central axis of the outlet pipe; the short axis gradually increases from the connection between the pillar and the tube body along the direction from the tube body to the pillar, so that the inner portion of the pillar forms an arcuate surface that gradually approaches the central axis of the outlet pipe along the direction from the tube body to the pillar, and the distal end of the arcuate surface is smoothly connected to the inner circumferential surface of the tube body.

[0010] In some embodiments, the major axis remains constant or gradually decreases along the direction from the tube to the strut.

[0011] In some embodiments, the connecting column comprises a proximal section and a distal section connected to each other; the distal end of the distal section is connected to the proximal end of the tube body;

[0012] The cross section of the distal section is an elliptical cross section, and has a short axis along the radial direction of the outlet tube and a long axis perpendicular to the short axis; the short axis gradually increases from the connection between the distal section and the tube body in the direction from the tube body to the pillar, so that the inner part of the distal section forms an arcuate surface curved in the direction from the tube body to the pillar, and the distal end of the arcuate surface is smoothly connected to the inner circumferential surface of the tube body;

[0013] The cross section of the proximal section is a circular cross section.

[0014] In some embodiments, the long axis of the distal segment remains unchanged or gradually decreases in the direction from the tube body to the pillar, and at the connection between the distal segment and the proximal segment, the short axis and the long axis of the distal segment are equal to the diameter of the proximal segment, so that the circumference of the distal segment and the circumference of the proximal segment are smoothly connected.

[0015] In some embodiments, the circumferential surface of the support comprises an inner portion facing the central axis of the outlet pipe, and the inner portion protrudes inwardly along the radial direction of the outlet pipe relative to the inner circumferential surface of the pipe body;

[0016] The inner circumference of the tube body is provided with a connecting portion, and the connecting portion has a transition slope, and the transition slope smoothly connects the inner circumference of the tube body and the inner side of the support;

[0017] Alternatively, a transition slope is provided at the distal end of the pillar, the distal end of the transition slope is smoothly connected to the inner circumferential surface of the tube body, and extends obliquely from the position of the smooth connection along the direction from the tube body to the pillar to the inner part, and the distance between the transition slope and the central axis of the outlet pipe gradually decreases in this extension direction.

[0018] In some embodiments, the transition slope is any one of an inclined plane, a concave arc surface and a convex arc surface.

[0019] In some embodiments, the circumference of the support comprises an inner portion facing the central axis of the outlet pipe; the inner portion protrudes inwardly along the radial direction of the outlet pipe relative to the inner circumference of the tube body; the proximal surface of the tube body is provided with a plurality of extension arms arranged at intervals, and the plurality of extension arms are respectively connected to the distal ends of the plurality of supports; wherein,

[0020] The outer arm surface of the extension arm is coplanar with the outer peripheral surface of the tube body;

[0021] The inner arm surface of the extension arm is coplanar with the inner circumferential surface of the tube body;

[0022] A transition slope is provided at the distal end of the support, and the transition slope is smoothly connected to the inner arm surface of the extension arm, and extends obliquely from the smoothly connected position along the direction from the tube body to the support to the inner part.

[0023] In some embodiments, the pillar further has at least one of the following features:

[0024] The number of the pillars is 2 to 4;

[0025] The central axis of the pillar is parallel to the central axis of the outlet pipe;

[0026] The support column is located on the inner side of the cylindrical surface where the outer peripheral surface of the tube body is located, and is tangent to the cylindrical surface where the outer peripheral surface of the tube body is located.

[0027] In some embodiments, the proximal end surface is divided into multiple sub-end surfaces by multiple pillars, and the multiple sub-end surfaces are arranged along the circumferential direction of the tube body; a chamfered portion is provided at the distal end connection of the circumferential surface of the pillar.

[0028] In some embodiments, the outlet tube further comprises a motor cover, the motor cover is connected to the proximal end of the support, and the motor cover can cover the distal opening of the housing of the motor of the blood pump;

[0029] Alternatively, the outlet tube further comprises a connecting ring, the connecting ring being connected to the proximal end of the support, and the connecting ring being capable of being fixedly connected to the distal end of the motor of the blood pump.

[0030] The present application also provides a cannula assembly, which includes an inlet tube, a cannula and an outlet tube as in any one of the above embodiments; the inlet tube is provided with a blood inlet; the proximal end of the cannula is fixedly connected to the tube body of the outlet tube; the distal end of the cannula is connected to the inlet tube.

[0031] The present application also provides a blood pump, which includes an impeller and an outlet tube as described in any one of the above embodiments, wherein the impeller is rotatably disposed in the lumen of the outlet tube.

[0032] In some embodiments, the impeller includes a hub and blades disposed on the hub; there is a first radial distance between the inner circumference of the tube body and the blades; there is a second radial distance between the support of the outlet pipe and the blades, and the second radial distance is not less than 0.8 times the first radial distance.

[0033] In some embodiments, the blood pump further comprises a cannula and an inlet tube; the inlet tube is provided with a blood outlet; the proximal end of the cannula is connected to the distal end of the outlet tube, and the distal end of the cannula is connected to the inlet tube.

[0034] In some embodiments, the blood pump further comprises a motor, a distal end of the motor is connected to a proximal end of the outlet tube, and the motor is capable of driving the impeller to rotate.

[0035] The outlet tube described above can make the circumference of the pillar a smooth surface by setting the cross-section of the pillar to at least one of a circular cross-section and an elliptical cross-section. Therefore, when blood is discharged from the lumen through the blood outlet, no matter at what angle or direction the blood is discharged, the circumference of the pillar is not easy to damage blood cells, thereby reducing the occurrence of hemolysis, effectively reducing the risk of hemolysis, and improving the safety performance of the outlet tube. In addition, the smooth circumference of the pillar has less resistance to blood flow, and blood can be discharged from the blood outlet more smoothly and quickly, which is beneficial to improving the efficiency of blood pumping. In addition, after the outlet tube is formed, since the circumference of the pillar is smooth and has no sharp angles or edges, there is no need or less need to polish the pillar for deburring, thereby reducing the processing steps. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A schematic structural diagram of a blood pump according to an embodiment of the present application is provided.

[0037] Figure 2 for Figure 1 Schematic diagram of the longitudinal section of the blood pump.

[0038] Figure 3 This is a schematic structural diagram of the outlet pipe of the first embodiment provided in the present application.

[0039] Figure 4 for Figure 3 Middle Edge A 1 -A 1 Cross-sectional view of the line.

[0040] Figure 5 for Figure 3 Middle Edge A 2 -A 2 Cross-sectional view of the line.

[0041] Figure 6 for Figure 5 Medium 1Enlarged view of .

[0042] Figure 7 This is a schematic structural diagram of the outlet pipe of the second embodiment provided in the present application.

[0043] Figure 8 for Figure 7 Middle edge B 1 -B 1 Cross-sectional view of the line.

[0044] Fig. 9 This is a schematic structural diagram of the outlet pipe of the third embodiment provided in the present application.

[0045] Fig.10 for Fig. 9 Middle edge C 1 -C 1 Cross-sectional view of the line.

[0046] Fig.11 This is a schematic structural diagram of the outlet pipe of the fourth embodiment provided in the present application.

[0047] Fig.12 for Fig.11 Front view of the middle outlet pipe.

[0048] Fig.13 for Fig.12 Middle edge D 1 -D 1 Cross-sectional view of the line.

[0049] Fig.14 for Fig.12 Middle edge D 2 -D 2 Cross-sectional view of the line.

[0050] Fig.15 for Fig.14 Medium 2 Enlarged view of .

[0051] Fig.16 This is a schematic structural diagram of the outlet pipe of the fifth embodiment provided in the present application.

[0052] Fig.17 for Fig.16 Middle edge E 1 -E 1 Cross-sectional view of the line.

[0053] Fig.18 for Fig.16 Middle edge E 2 -E 2 Cross-sectional view of the line.

[0054] Fig.19 for Fig.18 Medium 3Enlarged view of .

[0055] Fig. 20 This is a schematic structural diagram of the outlet pipe of the sixth embodiment provided in the present application.

[0056] Fig.21 for Fig. 20 Middle edge F 1 -F 1 Cross-sectional view of the line.

[0057] Fig. 22 for Fig. 20 Middle edge F 2 -F 2 Cross-sectional view of the line.

[0058] Fig.23 for Fig. 20 Middle edge F 3 -F 3 Cross-sectional view of the line.

[0059] Fig.24 for Fig.23 Medium 4 Enlarged view of . DETAILED DESCRIPTION

[0060] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth 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 violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0061] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "membrane wall thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0062] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0063] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0064] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0065] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0066] It should be noted that the terms "distal end" and "proximal end" throughout the text are only used to indicate relative positional relationships. The "distal end" of a component refers to the end of the component that enters the patient's body first and / or is farther away from the operator during normal operation, while the "proximal end" refers to the end that enters the patient's body later and / or is closer to the operator. Figure 1 , Figure 3 , Figure 7 , Fig. 9 , Fig.12 and Fig.16 The Y+ shown in the figure represents the direction from the "near end" to the "distal end"; and the Y- represents the direction from the "distal end" to the "near end".

[0067] See also Figure 1 The blood pump 10 mentioned in the present application is designed for percutaneous vascular intervention and is used to assist the heart in pumping blood. The blood pump 10 is mainly used to push blood to the left ventricle through the aorta to assist the left ventricle in pumping blood.

[0068] See also Figure 1 and Figure 2 The blood pump 10 includes an outlet tube 100, and the outlet tube 100 has a plurality of blood outlets 102. The "plurality" mentioned in the present application refers to two or more. When the blood pump 10 is working, blood passes through the lumen 101 of the outlet tube 100, and then is discharged from the blood outlet 102 to the outside of the blood pump 10.

[0069] See also Figure 1 and Figure 2 The blood pump 10 further includes an impeller 300, which is rotatably disposed in the lumen 101 inside the outlet tube 100. The impeller 300 includes a hub 310 and blades 320 disposed on the hub 310. When the impeller 300 rotates, blood can be driven to flow through the outlet tube 100.

[0070] See also Figure 1 and Figure 2 The blood pump 10 further includes a cannula (not shown), the proximal end of which is connected and communicated with the outlet tube 100. A blood inlet is provided at the distal end of the cannula, so that blood enters the cannula from the blood inlet and is then transported to the outlet tube 100 through the cannula.

[0071] See also Figure 1 and Figure 2 The blood pump 10 further includes an inlet tube (not shown in the figure), which is connected to the proximal end of the cannula and is provided with a blood inlet. When the blood pump 10 is working, the blood Q in the left ventricle can enter from the blood inlet of the inlet tube, then flow through the inner cavity of the cannula, and finally be discharged through the blood outlet 102 of the outlet tube 100. The inlet tube, the cannula, and the outlet tube 100 are combined into a cannula assembly. Of course, the cannula assembly can be without the inlet tube, for example, the blood inlet is directly opened at the distal end of the cannula.

[0072] See also Figure 1 and Figure 2The blood pump 10 further includes a motor 200, which is connected to the impeller 300, so that the motor 200 can drive the impeller 300 to rotate. The motor 200 is an in-vivo motor, that is, the motor 200 can be pushed into the patient's body together with the cannula assembly.

[0073] See also Figure 1 and Figure 2 The motor 200 may include a housing 210, a stator 220, a rotor 230 and a rotating shaft 240. The rotating shaft 240 is rotatably mounted on the housing 210; the rotating shaft 240 has a connecting end located outside the housing 210, and the connecting end is fixedly connected to the impeller 300. The rotor 230 is accommodated in the housing 210, and the rotor 230 is fixedly connected to the rotating shaft 240. The stator 220 is accommodated in the housing 210. The stator 220 is fixedly connected to the housing 210 and can drive the rotor 230 to rotate.

[0074] As for the housing 210, the housing 210 is cylindrical. The distal end of the housing 210 is fixedly connected to the proximal end of the outlet pipe 100; the proximal end of the housing 210 is fixedly connected to the distal end of the conduit 400. The stator 220 and the rotor 230 are both accommodated inside the housing 210 and arranged at intervals along the axial direction of the housing 210.

[0075] The number of rotors 230 may be one, two, or more than two. Specifically in the present embodiment, the number of rotors 230 is two, and the two rotors 230 are respectively located on both sides of the stator 220 in the axial direction. Each rotor 230 may include a plurality of magnets, and the plurality of magnets are arranged in a ring shape along the outer circumference of the rotating shaft 240. For example, the plurality of magnets are arranged in a Halbach array magnetic ring.

[0076] The number of stators 220 may be one, two, or more than two. One stator 220 can drive at least one rotor 230 to rotate. Specifically, in this embodiment, the number of stators 220 is two. Each stator 220 can drive at least one rotor 230 to rotate.

[0077] See also Figure 1 and Figure 2 The blood pump 10 further includes a catheter 400, which is fixedly connected to the proximal end of the motor 200. The catheter 400 is used to accommodate wires, flushing lines, and other wires of the motor 200.

[0078] In other embodiments, the motor 200 is an extracorporeal motor connected to a flexible shaft that passes through the catheter 400 so that the distal end of the flexible shaft is connected to the impeller 300 , whereby the motor 200 drives the flexible shaft to twist, thereby driving the impeller 300 to rotate.

[0079] See also Figure 1 and Figure 2For the outlet tube 100, the outlet tube 100 includes a tube body 110. The tube body 110 has an inner peripheral surface 111 and an outer peripheral surface 112, and the inner peripheral surface 111 encloses a lumen 101. The tube body 110 has a proximal end and a distal end, and blood can flow from the distal end to the proximal end through the lumen 101.

[0080] The outlet tube 100 further includes a plurality of struts 120, which are connected to the proximal end of the tube body 110, extend along the axial direction of the tube body 110, and are arranged at intervals along the circumference of the tube body 110, and a blood outlet 102 is spaced between two adjacent struts 120, and the blood outlet 102 is connected to the lumen 101. Blood can be discharged from the proximal end of the tube body 110 to the outside of the blood pump through the blood outlet 102.

[0081] In some related arts, the support 120 is generally a prism, that is, the support 120 is perpendicular to the central axis O of the outlet pipe 100. 1 The cross section of the support 120 is a polygon, so that the peripheral surface of the support 120 has more edges and corners or sharp edges. When the blood is discharged from the blood outlet 102, the blood contacts and collides with the sharp angles or sharp edges of the support 120, and hemolysis is likely to occur. In order to reduce the sharp angles or sharp edges on the peripheral surface of the support 120, the measures commonly used in the related art before the present application are to polish and deburr the sharp angles or sharp edges on the peripheral surface of multiple supports 120 of the outlet tube 100 separately after the outlet tube 100 is formed, so as to make the sharp angles or sharp edges rounded or chamfered. However, this method cannot completely remove the sharp angles or sharp edges on the peripheral surface of the support 120, and the processing process is also relatively cumbersome.

[0082] See also Figures 3 to 5 In the present application, in order to reduce the hemolysis problem, the support 120 has a central axis perpendicular to the outlet tube 100. 1 The cross section of at least one support 120 is a circular cross section S 1 and elliptical cross section S 2 At least one of the above mentioned embodiments makes the peripheral surface of the support 120 a smooth surface. It is understood that the contour line of the cross section of the support 120 is a smooth annular curve without edges and corners, so that the peripheral surface of the support 120 can be a smooth surface, such as a circular cross section S 1 Or oval cross section S 2 wait.

[0083] It is understood that the cross section of the at least one support 120 is at least one of a circular cross section and an elliptical cross section, which means that the cross section of the support 120 from the distal end to the proximal end is a circular cross section or an elliptical cross section; or the support 120 is divided into different sections along its length direction, wherein the cross section of one section is a circular cross section and the cross section of another section is an elliptical cross section. The details will be described in detail later.

[0084] In addition, the shapes of the plurality of pillars 120 of the outlet pipe 100 may be the same or different. In some embodiments, the cross-sections of all the pillars 120 are circular. 1 , that is, all the pillars 120 are cylindrical. In other embodiments, the cross-sections of all the pillars 120 are elliptical cross-sections S 2 , that is, all the pillars 120 are elliptical cylinders. In some other embodiments, a portion of the pillars 120 are cylindrical; and the remaining pillars 120 are elliptical cylinders.

[0085] The outlet pipe 100 is formed by setting the cross section of the support 120 to be a circular cross section S 1 and elliptical cross section S 2 At least one of the above can make the peripheral surface of the support 120 a smooth surface, so that when the blood is discharged from the lumen 101 through the blood outlet 102, no matter at what angle or direction the blood is discharged, the peripheral surface of the support 120 is not easy to damage the blood cells, thereby reducing the occurrence of hemolysis, effectively reducing the risk of hemolysis, and improving the safety performance of the outlet tube 100. In addition, the smooth peripheral surface of the support 120 has less resistance to the flow of blood, and the blood can be discharged from the blood outlet 102 more smoothly and quickly, which is conducive to improving the efficiency of blood pumping. In addition, after the outlet tube 100 is formed, since the peripheral surface of the support 120 is smooth and has no sharp angles or edges, it is unnecessary or less necessary to polish and deburr the support 120, thereby reducing the processing steps.

[0086] In the present application, the number of the pillars 120 may be 2 to 4, for example, 2, 3 or 4.

[0087] The specific embodiment of the outlet pipe 100 in the embodiment of the present application is described in detail below.

[0088] Figures 3 to 6 The outlet pipe 100A of the first embodiment of the present application is shown. Figures 3 to 5 In the first embodiment, the cross section of the support 120 is a circular cross section S 1 The circular cross section S 1 The contour line is a circular curve. From the distal end to the proximal end of the support 120, the cross section of the support 120 is a circular cross section S 1In this way, the peripheral surface of the support 120 can be a circular annular surface, and the peripheral surface of the support 120 is smoother.

[0089] Specifically, the tube body 110 of the outlet tube 100A further has a proximal end surface 113, and the distal ends of the plurality of struts 120 can be directly connected to the proximal end surface 113 of the tube body 110. The outlet tube 100A has a central axis O 1 ; Pillar 120 has a central axis O 2 , the central axis O of the support 120 2 and the central axis O of the outlet pipe 100A 1 In this way, the support column 120 becomes a long straight cylinder extending along the axial direction of the outlet pipe 100A.

[0090] Under basically the same conditions (such as the length and cross-sectional area are basically the same), compared to the traditional pillars which are prisms, the pillars 120 in the embodiment of the present application are cylinders, so that the pillars 120 have no corners and sharp edges, and the pressure can be evenly distributed on the entire column, which enables the pillars 120 to bear a greater weight. The force characteristics of the pillars 120 make the forces received by each part of the pillars 120 very uniform and symmetrical, so that the contact surface is not easily damaged, and therefore the bearing capacity of the pillars 120 is relatively strong, thereby improving the pushing capacity of the pillars 120. In the process of pushing the blood pump 10 into the patient's body, the pillars 120 can well transmit the pushing force to the cannula of the blood pump 10, reduce the difficulty of pushing the blood pump 10, and improve the pushing performance of the blood pump 10.

[0091] Since the support 120 of the present application has a strong load-bearing capacity, the number of support 120 on an outlet tube 100A can be relatively reduced. For example, when the support of a conventional outlet tube is a prism, at least 5 to 6 support pillars are required; while the support 120 required for the outlet tube 100A of the present application can be reduced to 2 to 4, preferably 3. In this way, the number of support pillars 120 of the outlet tube 100A of the present application is small, so that the outlet area of ​​the blood outlet 102 of the outlet tube 100A is larger, thereby increasing the amount of blood transported by the outlet tube 100A.

[0092] See also Figures 4 to 6 The peripheral surface of the support 120 includes a central axis O facing the outlet pipe 100A. 1 The inner portion 123 of the outlet pipe 100A and the central axis O of the outlet pipe 100A are opposite to each other. 1 The outer portion 124 and the inner portion 123 enclose a circumference of the support column 120.

[0093] It is understood that the diameter Φ of the support 120 is 1 It can be equal to the wall thickness H of the tube body 110, that is, Φ 1= H. In this way, the radial thickness of the support 120 is just equal to the wall thickness of the tube body 110, the distal end of the support 120 can just fit and connect to the proximal end surface 113 of the tube body 110, and the inner portion 123 of the support 120 will not protrude inwardly along the radial direction of the outlet pipe 100A relative to the inner circumferential surface 111 of the tube body 110; the outer portion 124 of the support 120 will not protrude outwardly along the radial direction of the outlet pipe 100A relative to the outer circumferential surface 112 of the tube body 110.

[0094] In other words, the support 120 is entirely located between the cylindrical surface where the inner circumference 111 of the tube body 110 is located and the cylindrical surface where the outer circumference 112 of the tube body 110 is located. The outer portion 124 of the support 120 is tangent to the cylindrical surface where the outer circumference 112 of the tube body 110 is located, and the inner portion 123 of the support 120 is tangent to the cylindrical surface where the inner circumference 111 of the tube body 110 is located.

[0095] The outer portion 124 of the support 120 does not protrude outwardly in the radial direction of the outlet tube 100A relative to the outer peripheral surface 112 of the tube body 110, which can reduce the contact friction between the support 120 and the inner wall of the blood vessel during the process of pushing the blood pump 10. The inner portion 123 of the support 120 does not protrude inwardly in the radial direction of the outlet tube 100A relative to the inner peripheral surface 111 of the tube body 110, which can make it difficult for the inner portion 123 of the support 120 to contact and interfere with the impeller 300 arranged in the outlet tube 100A.

[0096] Specifically, there is a first radial distance L between the inner circumferential surface 111 of the tube body 110 and the blades 320 of the impeller 300. 1 There is a second radial spacing L between the circumference of the support 120 (specifically the inner portion 123) and the blades 320 of the impeller 300 2 Since the inner portion 123 of the support 120 is tangent to the cylindrical surface where the inner circumferential surface 111 of the tube body 110 is located, the second radial distance L 2 The first radial distance L 1 Equal, that is, L 2 =L 1 This can prevent the impeller 300 from interfering with the support 120 when rotating.

[0097] In this embodiment, the diameter of the support 120 is Φ 1 is set to be greater than the wall thickness H of the tube body 110, that is, Φ 1>H. This can increase the strength of the support 120, making it less likely for the support 120 to bend or deform, thereby improving the pushing capability of the support 120. At this time, the inner portion 123 of the support 120 will protrude inwardly along the radial direction of the outlet pipe 100A relative to the inner circumferential surface 111 of the tube body 110; or, the outer portion 124 of the support 120 will protrude outwardly along the radial direction of the outlet pipe 100A relative to the outer circumferential surface 112 of the tube body 110.

[0098] However, since the support 120 is a cylinder, even if the inner portion 123 of the support 120 slightly protrudes radially inward relative to the inner circumferential surface 111 of the tube body 110 along the radial direction of the outlet tube 100A, since the inner portion 123 of the support 120 has no sharp edges or corners, the inner portion 123 of the support 120 is not easy to damage the blood inside the outlet tube 100A.

[0099] Similarly, even if the outer portion 124 of the support 120 protrudes slightly outward in the radial direction of the outlet tube 100A relative to the outer peripheral surface 112 of the tube body 110, since the outer portion 124 of the support 120 has no sharp edges or corners, it is not easy for the outer portion 124 of the support 120 to scratch and damage the inner wall of the blood vessel.

[0100] It is understood that the diameter Φ of the support 120 is 1 It is preferred that the diameter Φ of the support 120 is slightly larger than the wall thickness H of the tube body 110, that is, the difference between the two should not be too large. 1 The ratio of Φ to the wall thickness H of the tube body 110 may be 1.15 to 1.35. 1 / H ratio is 1.15 to 1.35. Within this range, the diameter Φ of the support 120 can be 1 The difference between the thickness H of the tube wall of the tube body 110 is not too large, so that the inner part 123 of the support 120 does not protrude excessively from the inner peripheral surface 111 of the tube body 110, thereby preventing the support 120 from interfering with the impeller 300; the outer part 124 of the support 120 does not protrude excessively from the outer peripheral surface 111 of the tube body 110, thereby reducing the support 120 from scraping the inner wall of the blood vessel. The ratio can be, but is not limited to, 1.18, 1.2, 1.22, 1.25, 1.28, 1.30, 1.33, etc.

[0101] Since the diameter Φ of the support 120 1 When the inner portion 123 of the support 120 is slightly protruded inwardly relative to the inner circumferential surface 111 of the tube body 110 along the radial direction of the outlet pipe 100A, the second radial spacing L between the circumferential surface of the support 120 (specifically the inner portion 123) and the blades 320 of the impeller 300 is greater than the tube wall thickness H of the tube body 110, and the inner portion 123 of the support 120 is slightly protruded inwardly relative to the inner circumferential surface 111 of the tube body 110 along the radial direction of the outlet pipe 100A 2 , will be smaller than the first radial distance L between the inner circumferential surface 111 of the tube body 110 and the blades 320 of the impeller 300 1 , that is, L2 <L 1 To avoid interference between the inner portion 123 of the support 120 and the blades 320 of the impeller 300, optionally, the second radial distance L 2 Not less than the first radial distance L 1 0.8 times, that is, L 2 ≥ 0.8 L 1 .L 1 The value can be but is not limited to 0.82L 1 、0.85L 1 , 0.9L 1 , 0.95L 1 For example, the first radial distance L 1 The range of is usually 0.1mm to 0.12mm; then the first radial distance L 1 At least 0.08mm. 2 ≥ 0.8 L 1 , can ensure the second radial spacing L 2 The inner portion 123 of the support 120 will not be too small to prevent interference between the blades 320 of the impeller 300 .

[0102] See also Figures 4 to 6 Since the inner portion 123 protrudes radially inward relative to the inner circumferential surface 111 of the tube body 110 along the radial direction of the outlet tube 100A, if a radially protruding step surface is formed at the connection between the distal end of the support 120 and the inner portion 123 of the tube body 110, then when blood flows from the lumen 101 to the blood outlet 102 between the two supports 120, the step surface may produce a certain resistance to the blood flow.

[0103] In view of the above situation, in this embodiment, the inner circumferential surface 111 of the tube body 110 is provided with a connecting portion 114, and the connecting portion 114 is in a slope shape, so that the connecting portion 114 has a transition slope 114a, and the transition slope 114a smoothly connects the inner circumferential surface 111 of the tube body 110 and the inner part 123 of the circumferential surface of the support 120. In this way, the inner part 123 of the support 120 can smoothly transition to the inner circumferential surface 111 of the tube body 110 along the transition slope 114a. A part of the blood in the lumen 101 can flow into the inner side of the support 120 along the transition slope 114a, so that the blood can be prevented from directly colliding with the distal end of the support 120.

[0104] Optionally, the transition slope 114a can be any one of an inclined plane, a concave arc surface and a convex arc surface. The connecting portion 114 can be made of materials such as solder, solid glue, etc. The connecting portion 114 can also be a convex portion formed integrally with the tube body 110.

[0105] In addition, for the support 120, the support 120 as a whole is located inside the cylindrical surface where the outer peripheral surface 112 of the tube body 110 is located, and the outer portion 124 of the support 120 is tangent to the cylindrical surface where the outer peripheral surface 112 of the tube body 110 is located. In this way, the outer portion 124 of the support 120 will not protrude radially outward relative to the outer peripheral surface 112 of the tube body 110. In the process of pushing the blood pump 10 into the patient's blood vessel, the outer portion 124 of the support 120 is not easy to scrape the inner wall of the blood vessel.

[0106] For the proximal end surface 113 of the tube body 110, the proximal end surface 113 of the tube body 110 is divided into multiple sub-end surfaces by multiple pillars 120, and the multiple sub-end surfaces are arranged along the circumferential direction of the tube body 110; a chamfered portion 115 is provided at the connection between the sub-end surface and the distal end of the pillar 120.

[0107] Regarding the connection method between the proximal end of the outlet tube 100A and the motor 200 of the blood pump 10, generally speaking, the proximal end of the pillar 120 of the outlet tube 100A is directly welded to the distal end of the motor 200. However, when welding each pillar 120 to the motor 200 one by one, it is easy to produce an operation error, and it is difficult to ensure that each pillar 120 maintains a uniform second radial spacing L with the impeller 300. 2 .

[0108] The present application takes into account that the housing 210 of the motor 200 generally has a distal opening, and is connected to the housing 210 through a motor cover 130 to cover the distal opening of the housing 210. The motor cover 130 is provided with a mounting opening 131, and the mounting opening 131 is used to accommodate a sleeve or a bearing 250 that supports the rotation of the rotating shaft 240. Therefore, the proximal end of the pillar 120 can be connected to the motor cover 130, so that the pillar 120 and the motor cover 130 are integrally formed. After forming, the distance from each pillar 120 to the central axis of the motor cover 130 is kept consistent. In this way, when the motor cover 130 is connected to the housing 210 of the motor 200, it is only necessary to calibrate the central axis of the motor cover 130 and the central axis of the rotating shaft 240 (that is, the central axis of the impeller 300) to be consistent, so that the second radial spacing L between each pillar 120 and the impeller 300 is 2 It can basically remain consistent.

[0109] Of course, the motor cover 130 is not necessary. In other embodiments, the outlet pipe 100A further includes Fig.11 The connecting ring 150 shown is connected to the proximal end of the pillar 120, and the connecting ring 150 can be fixedly connected to the distal end of the motor 200 of the blood pump 10. The connecting ring 150 can be integrally formed with the pillar 120. After calibrating the central axis of the connecting ring 150 to be consistent with the central axis of the motor 200, the second radial spacing L between each pillar 120 and the impeller 300 is 2 Can also remain basically consistent.

[0110] Figure 7 and Figure 8 The outlet pipe 100B of the second embodiment of the present application is shown. In the second embodiment, the outlet pipe 100B is different from the outlet pipe 100A of the previous embodiment in that a transition slope 12a is provided at the distal end of the support 120, and the distal end of the transition slope 12a is smoothly connected to the inner circumference 111 of the tube body 110, and extends obliquely from the position of the smooth connection along the direction from the tube body 110 to the support 120 (i.e., the Y-direction) to the inner part 123 of the support 120; in this extension direction, the transition slope 114a and the central axis O of the outlet pipe 100B are aligned. 1 The distance between them gradually decreases.

[0111] Specifically, the distal end surface of the support 120 is connected to the proximal end surface 113 of the tube body 110; the distal end of the transition slope 12a intersects with the distal end surface of the support 120 and is smoothly connected to the inner circumferential surface 111 of the tube body 110. The transition slope 12a is along the Y-direction and gradually approaches the central axis O of the outlet pipe 100B. 1 The support 120 extends obliquely in the direction of the support 120 and intersects with the inner portion 123. Since the support 120 is a cylinder, the intersection line M where the inner portion 123 of the support 120 and the transition slope 12a intersect is a smooth teardrop shape, and the resistance of blood flowing along the transition slope 12a to the inner side of the support 120 is small. The stress on the periphery of the transition slope 12a is also small, and it is not easy to damage blood cells.

[0112] Of course, the intersection of the inner portion 123 of the support 120 and the transition slope 12a may also be rounded to make the connection between the inner portion 123 and the transition slope 12a smooth and without sharp corners.

[0113] Optionally, the transition inclined surface 12a may also be any one of an inclined plane, a concave arc surface and a convex arc surface.

[0114] Fig. 9 and Fig.10 The outlet pipe 100C of the third embodiment of the present application is shown. In the third embodiment, the outlet pipe 100C is different from the outlet pipe 100B of the second embodiment in that the proximal end surface 113 of the tube body 110 is provided with a plurality of extension arms 140 arranged at intervals along the circumference of the tube body 110, and the plurality of extension arms 140 are respectively connected to the distal ends of the plurality of pillars 120. The radial thickness of the extension arm 140 is the same as the tube wall thickness H of the tube body 110. The outer arm surface 142 of the extension arm 140 is coplanar with the outer peripheral surface 112 of the tube body 110; the inner arm surface 141 of the extension arm 140 is coplanar with the inner peripheral surface 111 of the tube body 110.

[0115] Since the peripheral surface of the support 120 (specifically the inner portion 123) is protruding relative to the inner peripheral surface 111 of the tube body 110, the distal end of the support 120 may block a small portion of the blood flowing axially. However, due to the existence of the extension arm 140, there can be an axial distance between the connection between the extension arm 140 and the support 120 and the inner peripheral surface 111 of the tube body 110. When blood flows from the lumen 101 to between two adjacent extension arms 140, a portion of the blood can be discharged from the blood outlet 102 between the two adjacent extension arms 140, and the blood flow is reduced, so that the blood flow to the connection between the extension arm 140 and the support 120 will be relatively reduced. Even if a portion of the blood is hit at the connection between the extension arm 140 and the support 120, the blood will be blocked by the connection and will be diverted to the blood outlets 102 on both sides of the extension arm 140, and then will be discharged from the blood outlets 102 on both sides of the extension arm 140.

[0116] Furthermore, a transition slope 12a is provided at the distal end of the support 120, and the transition slope 12a is smoothly connected to the inner arm surface 141 of the extension arm 140. The transition slope 12a extends obliquely from the smoothly connected position along the direction from the tube body 110 to the support 120 to the inner part 123 of the peripheral surface of the support 120. In this way, a step surface can be avoided at the connection between the support 120 and the extension arm 140. Blood can flow along the inner arm surface 141 of the extension arm 140 to the transition slope 12a, and then slowly pass through the transition slope 12a, and the blood flow resistance is small.

[0117] Figures 11 to 15 The outlet pipe 100D of the fourth embodiment of the present application is shown. Figures 11 to 14 In the fourth embodiment, the outlet pipe 100D is different from the outlet pipe 100A of the first embodiment in that the cross section of the support 120 of the outlet pipe 100D is an elliptical cross section S 2 The oval cross section S 2 The contour line is an elliptical curve. In this embodiment, from the distal end to the proximal end of the support 120, the cross section of the support 120 is an elliptical cross section S. 2 In this way, the support 120 is an elliptical cylinder, the peripheral surface of the support 120 is an elliptical annular surface, and the peripheral surface of the support 120 is also relatively smooth.

[0118] See also Figures 13 to 15 Specifically, the elliptical cross section S 2 With short axis Φ 2x and the major axis Φ 2z , short axis Φ 2x is the elliptical cross section S 2 The radial dimension of the tube body 110; the major axis Φ 2z is the elliptical cross section S 2perpendicular to the short axis Φ 2x The dimension in the direction. Obviously, Φ 2z >Φ 2x The radial thickness of the strut 120 (i.e. the short axis Φ 2x ) is small, which can reduce the space occupied by the support 120 along the radial direction and prevent the support 120 from interfering with the impeller 300 in the outlet pipe 100D; and the width of the support 120 along the circumferential direction of the outlet pipe 100D (i.e., the major axis Φ 2z ) is larger, which can increase the strength of the support 120 and improve the pushing ability of the support 120.

[0119] In this embodiment, the elliptical cross section S 2 The short axis Φ 2x and the major axis Φ 2z The size of φ remains unchanged in the direction from the support 120 to the tube body 110 (ie, the Y+ direction). 2x It can be equal to the wall thickness H of the tube body 110. In this way, the radial thickness of the support 120 is just equal to the wall thickness H of the tube body 110, the distal end of the support 120 can just be adapted to be connected to the proximal end surface 113 of the tube body 110, the inner portion 123 of the support 120 will not protrude radially inward relative to the inner circumferential surface 111 of the tube body 110, and the outer portion 124 of the support 120 will not protrude radially outward relative to the outer circumferential surface 112 of the tube body 110.

[0120] In other words, the support 120 is entirely located between the cylindrical surface where the inner circumference 111 of the tube body 110 is located and the cylindrical surface where the outer circumference 112 of the tube body 110 is located. The outer portion 124 of the support 120 is tangent to the cylindrical surface where the outer circumference 112 of the tube body 110 is located, and the inner portion 123 of the support 120 is tangent to the cylindrical surface where the inner circumference 111 of the tube body 110 is located.

[0121] The inner portion 123 of the support 120 does not protrude radially inward relative to the inner circumferential surface 111 of the tube body 110, so that the inner portion 123 of the support 120 is not easily contacted with the impeller 300 in the outlet pipe 100D (see Figure 2 Specifically, there is a first radial distance L between the inner circumferential surface 111 of the tube body 110 and the blades 320 of the impeller 300. 1 There is a second radial distance L between the circumference of the support 120 and the blades 320 of the impeller 300 2 Since the inner portion 123 of the support 120 is tangent to the cylindrical surface where the inner circumferential surface 111 of the tube body 110 is located, the second radial distance L 2 The first radial distance L 1 Equal, that is, L 2 =L 1This can prevent the impeller 300 from interfering with the support 120 when rotating.

[0122] It can be understood that if the major axis Φ 2z With short axis Φ 2x The difference is too large, the support 120 is on the long axis Φ 2z The two ends of may form a tip. So optionally, the long axis Φ 2z With short axis Φ 2x The ratio is 1.5 to 3. Within this range, the long axis Φ of the support 120 can be 2z With short axis Φ 2x The difference will not be too large, which can effectively prevent the support 120 from being on the long axis Φ 2z The two ends of the slit are pointed. The ratio can be, but is not limited to, 1.6, 1.8, 2.0, 2.2, 2.5, 2.8, 2.9, etc.

[0123] In this embodiment, the short axis Φ of the support 120 is 2x is set to be greater than the wall thickness H of the tube body 110, that is, Φ 2x >H. This can increase the strength of the support 120, making it less likely for the support 120 to bend or deform, thereby improving the pushing capability of the support 120. At this time, the inner portion 123 of the support 120 will protrude inwardly along the radial direction of the outlet pipe 100A relative to the inner circumferential surface 111 of the tube body 110; or, the outer portion 124 of the support 120 will protrude outwardly along the radial direction of the outlet pipe 100A relative to the outer circumferential surface 112 of the tube body 110.

[0124] However, since the support 120 is an elliptical cylinder, even if the inner portion 123 of the support 120 slightly protrudes radially inward relative to the inner circumferential surface 111 of the tube body 110 along the radial direction of the outlet tube 100A, since the inner portion 123 of the support 120 has no sharp edges or sharp edges, the inner portion 123 of the support 120 is not easy to damage the blood inside the outlet tube 100A.

[0125] Of course, the minor axis Φ 2x The difference between the short axis Φ and the wall thickness H of the tube body 110 should not be too large. 2x The ratio of Φ to the wall thickness H of the tube body 110 may be 1.15 to 1.35. 2x / H ratio is 1.15 to 1.35. Within this range, the short axis Φ of the support 120 can be 2xThe difference between the thickness H of the tube wall of the tube body 110 is not too large, so that the inner part 123 of the support 120 does not protrude excessively from the inner peripheral surface 111 of the tube body 110, thereby preventing the support 120 from interfering with the impeller 300; the outer part 124 of the support 120 does not protrude excessively from the outer peripheral surface 111 of the tube body 110, thereby reducing the support 120 from scraping the inner wall of the blood vessel. The ratio can be specifically, but not limited to, 1.18, 1.2, 1.22, 1.25, 1.28, 1.30, 1.33, etc.

[0126] Such as the above Figures 3 to 6 Like the first embodiment shown, the outlet pipe 100D of this embodiment can also be provided with a connecting portion 114 on the inner circumferential surface 111 of the tube body 110 so as to be connected to the support 120 through the connecting portion 114. The transition slope 114a of the connecting portion 114 smoothly connects the inner portion 123 of the tube body 110 and the circumferential surface of the support 120.

[0127] Such as Figure 7 and Figure 8 As in the second embodiment shown, the outlet pipe 100D of this embodiment can also be provided with a transition slope 12a at the distal end of the support 120, so that the transition slope 12a smoothly connects the inner portion 123 of the pipe body 110. As for the shape and structure of the transition slope 12a, it can be implemented with reference to the above-mentioned second embodiment, and will not be described again here.

[0128] Of course, such as Fig. 9 and Fig.10 As in the third embodiment shown in FIG. 1 , the outlet pipe 100D of this embodiment can also be provided with an extension arm 140 on the proximal end surface 113 of the pipe body 110, and connected to the support 120 via the extension arm 140. The shape and structure of the extension arm 140 and the connection method with the support 120 are specifically implemented with reference to the third embodiment described above, and will not be described in detail here.

[0129] In this embodiment, the outlet pipe 100D further includes a connecting ring 150, which is connected to the proximal end of the pillar 120, so that the pillar 120 and the connecting ring 150 are integrally formed. After forming, the distance between each pillar 120 and the central axis of the connecting ring 150 is kept consistent. In this way, when the connecting ring 150 and the distal end of the motor 200 are connected, it is only necessary to make the central axis of the connecting ring 150 consistent with the central axis of the impeller 300, so that the central axes of the plurality of pillars 120 and the impeller 300 can be kept consistent, thereby making the second radial spacing L between each pillar 120 and the impeller 300 consistent. 2 Be consistent.

[0130] Of course, the connecting ring 150 is not necessary. In other embodiments (such as the first to third embodiments described above), the outlet tube 100D further includes a motor cover 130, which is connected to the proximal end of the support 120. The motor cover 130 can cover the distal end opening of the housing 210 of the motor 200 of the blood pump 10. The motor cover 130 and the support 120 are integrally formed. That is, the motor cover 130 can be used instead of the connecting ring 150.

[0131] Figures 16 to 19 The outlet pipe 100E of the fifth embodiment of the present application is shown. Figures 16 to 19 In the fifth embodiment, the outlet pipe 100E is different from the outlet pipe 100D of the fourth embodiment in that the short axis Φ of the support 120 is 2x and the major axis Φ 2z At least one of the two axes φ is gradually changed in the direction from the tube body 110 to the support 120 (ie, the Y-direction). Specifically, the short axis φ of the support 120 is 2x The diameter of the inner portion 111 of the support 120 gradually increases from the connection between the support 120 and the tube body 100 (i.e., the proximal end surface 113) along the direction from the tube body 110 to the support 120. In this way, the inner portion 111 of the support 120 can form an arcuate surface 12b curved along the Y-direction, and the arcuate surface 12b and the central axis O of the outlet tube 100E are aligned. 1 The distance between the two surfaces gradually decreases along the Y-direction. In this way, the arc surface 12b can reduce the contact and interference with the blades 320 of the impeller 300, and can also guide the blood to flow toward the blood outlet 102 along the Y-direction.

[0132] Obviously, due to the minor axis Φ of the support 120 2x The Y-direction gradually increases, so the distal end of the support 120 has a short axis Φ 2x The minimum value of the short axis Φ 2x The minimum value is equal to the wall thickness H of the tube body 110 , so that the radial thickness of the distal end of the support 120 is exactly equal to the wall thickness H of the tube body 110 , and the distal circumference of the arc surface 12b can be smoothly connected with the inner circumference 111 of the tube body 110 .

[0133] In this embodiment, the major axis Φ of the support 120 is 2z The direction from the tube body 110 to the support 120 (ie, the Y-direction) can remain unchanged. 2x The cross-sectional area of ​​the proximal end of the support 120 is gradually increased along the direction from the tube body 110 to the support 120, so that the proximal end of the support 120 has a larger strength, and the proximal end of the support 120 is more firmly connected to the motor 200. The flow rate at the proximal end of the support 120 is relatively small, and even if the cross-sectional area of ​​the proximal end of the support 120 is slightly larger, its effect on the blood flow is small and can be almost ignored.

[0134] Of course, in other embodiments, the major axis Φ of the support 120 is 2z It may also be gradually reduced in the direction from the tube body 110 to the support 120 .

[0135] Fig. 20 and Fig.24 The outlet pipe 100F of the sixth embodiment of the present application is shown. Figure 20 to Figure 23 In the sixth embodiment, the support 120 of the outlet pipe 100F includes a proximal section 121 and a distal section 122 connected to each other; the proximal section 121 is far away from the tube body 110; the distal end of the distal section 122 is connected to the proximal end of the tube body 110. The cross section of the proximal section 121 is a circular cross section S 1 The cross section of the distal segment 122 is an elliptical cross section S 2 In other words, the proximal section 121 of the strut 120 is a cylinder, and the distal section 122 of the strut 120 is an elliptical cylinder.

[0136] See also Figure 21 to Figure 24 Specifically, the cross section of the proximal segment 121 (circular cross section S 1 ) has a diameter Φ 1 , diameter Φ 1 The size of the distal segment 122 (elliptical cross section S) can be referred to the first embodiment, which can also achieve basically the same effect, and will not be repeated here. 2 ) has a minor axis Φ 2x and the major axis Φ 2z , short axis Φ 2x is the elliptical cross section S 2 The radial dimension of the tube body 110; the major axis Φ 2z is the elliptical cross section S 2 perpendicular to the short axis Φ 2x The dimension in the direction. Obviously, Φ 2z >Φ 2x . Short axis Φ 2x and the major axis Φ 2z The size of can refer to the fourth embodiment mentioned above, and can also achieve basically the same effect, which will not be repeated here. In addition, the proximal section 121 can make the support 120 have a stronger pushing ability; and the distal section 122 can reduce the resistance of the support 120 to the blood flowing along the lumen 101 to the blood outlet 102.

[0137] Specifically in this embodiment, the short axis Φ of the distal segment 122 is 2x The proximal end surface 113 of the tube body 100 gradually increases in the direction from the tube body 110 to the support 120 (i.e., the Y-direction). In this way, the inner portion 111 of the distal segment 122 can form an arcuate surface 12b curved along the Y-direction, and the arcuate surface 12b and the central axis O of the outlet tube 100F are aligned. 1The distance between the two surfaces gradually decreases along the Y-direction. In this way, the arc surface 12b can reduce the contact and interference with the blades 320 of the impeller 300, and can also guide the blood to flow toward the blood outlet 102 along the Y-direction.

[0138] Obviously, due to the short axis Φ of the distal segment 122 2x The diameter of the distal segment 122 gradually increases from the connection between the support 120 and the tube body 100 (i.e., the proximal end surface 113) along the direction from the tube body 110 to the support 120, so that the distal end of the distal segment 122 has a short axis Φ 2x The minimum value of the short axis Φ 2x The minimum value is equal to the wall thickness H of the tube body 110 , so that the radial thickness of the distal end of the distal segment 122 is exactly equal to the wall thickness H of the tube body 110 , and thus the distal end of the arcuate surface 12 b can be smoothly connected to the inner circumferential surface 111 of the tube body 110 .

[0139] The long axis Φ of the distal segment 122 2z The short axis Φ of the distal segment 122 may remain constant or gradually decrease along the direction from the tube body 110 to the support 120 (ie, the Y-direction). 2x , major axis Φ 2z The diameter Φ of the proximal section 121 1 The distal section 122 is equal to the proximal section 121, so that the circumference of the distal section 122 is smoothly connected to the circumference of the proximal section 121. Relatively speaking, the proximal section 121 is a cylinder, which can make the proximal section 121 better transmit the pushing ability along the Y+ direction; while the distal section 122 is an elliptical cylinder, which can reduce the resistance of the support 120 to the blood flowing along the lumen 101 to the blood outlet 102.

[0140] It is understandable that the distal segment 122 can be integrally formed with the proximal segment 121 .

[0141] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, 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, they should be considered to be within the scope of this specification.

[0142] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. An outlet pipe, characterized in that: The outlet pipe comprises: A tube body, the tube body having an inner circumferential surface and an outer circumferential surface, the inner circumferential surface enclosing a tube cavity; and A plurality of pillars, wherein the plurality of pillars are connected to the proximal end of the tube body, the plurality of pillars extend along the axial direction of the tube body, and are arranged at intervals along the circumference of the tube body, and a blood outlet is spaced between two adjacent pillars, and the blood outlet is communicated with the tube cavity; The pillar has a cross section perpendicular to the central axis of the outlet pipe, and the cross section of at least one of the pillars is at least one of a circular cross section and an elliptical cross section, so that the peripheral surface of the pillar is a smooth surface.

2. The outlet pipe according to claim 1, characterized in that The cross section of the pillar is a circular cross section; the diameter of the pillar is greater than or equal to the wall thickness of the tube body.

3. The outlet pipe according to claim 2, characterized in that The ratio of the diameter of the pillar to the wall thickness of the tube body is 1.15 to 1.

35.

4. The outlet pipe according to claim 1, characterized in that The cross section of the support is an elliptical cross section; the elliptical cross section has a short axis in the radial direction of the outlet pipe and a long axis perpendicular to the short axis, and the long axis is larger than the short axis.

5. The outlet pipe according to claim 4, characterized in that The minor axis is greater than or equal to the wall thickness of the tube body; and / or the ratio of the major axis to the minor axis is 1.5-3.

6. The outlet pipe according to claim 4, characterized in that The circumferential surface of the support includes an inner portion facing the central axis of the outlet pipe; the short axis gradually increases from the connection between the support and the tube body along the direction from the tube body to the support, so that the inner portion of the support forms an arc surface that gradually approaches the central axis of the outlet pipe along the direction from the tube body to the support, and the distal end of the arc surface is smoothly connected to the inner circumferential surface of the tube body.

7. The outlet pipe according to claim 4, characterized in that The major axis remains constant or gradually decreases along the direction from the tube body to the support.

8. The outlet pipe according to claim 1, characterized in that The connecting column comprises a proximal section and a distal section connected to each other; the distal end of the distal section is connected to the proximal end of the tube body; The cross section of the distal section is an elliptical cross section, and has a short axis along the radial direction of the outlet tube and a long axis perpendicular to the short axis; the short axis gradually increases from the connection between the distal section and the tube body in the direction from the tube body to the pillar, so that the inner part of the distal section forms an arcuate surface curved in the direction from the tube body to the pillar, and the distal end of the arcuate surface is smoothly connected to the inner circumferential surface of the tube body; The cross section of the proximal section is a circular cross section.

9. The outlet pipe according to claim 8, characterized in that The long axis of the distal segment remains unchanged or gradually decreases in the direction from the tube body to the pillar. At the connection between the distal segment and the proximal segment, the short axis and the long axis of the distal segment are equal to the diameter of the proximal segment, so that the circumference of the distal segment and the circumference of the proximal segment are smoothly connected.

10. The outlet pipe according to any one of claims 1 to 9, characterized in that: The circumferential surface of the support comprises an inner portion facing the central axis of the outlet pipe, and the inner portion protrudes inwardly along the radial direction of the outlet pipe relative to the inner circumferential surface of the pipe body; The inner circumference of the tube body is provided with a connecting portion, and the connecting portion has a transition slope, and the transition slope smoothly connects the inner circumference of the tube body and the inner side of the support; Alternatively, a transition slope is provided at the distal end of the pillar, the distal end of the transition slope is smoothly connected to the inner circumferential surface of the tube body, and extends obliquely from the position of the smooth connection along the direction from the tube body to the pillar to the inner part, and the distance between the transition slope and the central axis of the outlet pipe gradually decreases in this extension direction.

11. The outlet pipe according to claim 10, characterized in that The transition inclined surface is any one of an inclined plane, a concave arc surface and a convex arc surface.

12. The outlet pipe according to any one of claims 1 to 9, characterized in that: The circumference of the support comprises an inner portion facing the central axis of the outlet pipe; the inner portion protrudes inwardly along the radial direction of the outlet pipe relative to the inner circumference of the tube body; the proximal end surface of the tube body is provided with a plurality of extension arms arranged at intervals, and the plurality of extension arms are respectively connected to the distal ends of the plurality of supports; wherein, The outer arm surface of the extension arm is coplanar with the outer peripheral surface of the tube body; The inner arm surface of the extension arm is coplanar with the inner circumferential surface of the tube body; A transition slope is provided at the distal end of the support, and the transition slope is smoothly connected to the inner arm surface of the extension arm, and extends obliquely from the smoothly connected position along the direction from the tube body to the support to the inner part.

13. The outlet pipe according to any one of claims 1 to 9, characterized in that: The pillar also has at least one of the following characteristics: The number of the pillars is 2 to 4; The central axis of the pillar is parallel to the central axis of the outlet pipe; The support column is located on the inner side of the cylindrical surface where the outer peripheral surface of the tube body is located, and is tangent to the cylindrical surface where the outer peripheral surface of the tube body is located.

14. The outlet pipe according to any one of claims 1 to 9, characterized in that: The outlet pipe further comprises a motor cover, which is connected to the proximal end of the support, and can cover the distal end opening of the housing of the motor of the blood pump, and the motor cover, the support and the tube body are integrally formed; Alternatively, the outlet tube further comprises a connecting ring, which is connected to the proximal end of the support, and the connecting ring can be fixedly connected to the distal end of the motor of the blood pump, and the connecting ring, the support and the tube body are integrally formed.

15. A cannula assembly, characterized in that: The cannula assembly comprises: an inlet tube, wherein the inlet tube is provided with a blood inlet; The outlet pipe according to any one of claims 1 to 14; and A cannula, the proximal end of which is fixedly connected to the proximal end of the outlet tube; and the distal end of which is connected to the inlet tube.

16. 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 14, wherein the impeller is rotatably disposed in a lumen of the outlet tube.

17. The blood pump according to claim 16, characterized in that The impeller includes a hub and blades arranged on the hub; there is a first radial distance between the inner circumference of the tube body and the blades; there is a second radial distance between the support of the outlet pipe and the blades, and the second radial distance is not less than 0.8 times of the first radial distance.

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