Infusion tubing, cannula assembly and blood pump

Abstract

This application relates to a delivery tube, a cannula assembly, and a blood pump. The delivery tube is hollow and has an inner wall surface, an outer wall surface, and a blood passage through the inner and outer wall surfaces. The delivery tube also has a wall defining the blood passage, with its inner edge connected to the inner wall surface and its outer edge connected to the outer wall surface. At least a portion of the wall is arc-shaped from its inner edge to its outer edge, and the center of the arc-shaped circle of the at least portion of the wall is located between the inner and outer wall surfaces. The delivery tube of this application not only reduces damage to blood flowing through various areas of the delivery tube, thus minimizing the negative impact of the blood pump on human health during use, but also improves pumping efficiency.

Description

Technical Field

[0001] This application relates to the field of blood pump technology, and in particular to a fluid delivery tube, a cannula assembly, and a blood pump. Background Technology

[0002] A blood pump, also known as an intracardiac or intravascular blood pump, is inserted into a blood vessel and protrudes into the patient's heart to function as a left or right ventricular assist device. Traditional blood pumps are prone to causing blood cell damage during the flow of blood into and out of the pump, necessitating improvements. Summary of the Invention

[0003] Therefore, it is necessary to provide a delivery tube, a cannula assembly, and a blood pump to address the problem of blood cell damage during the blood flow driven by the blood pump.

[0004] In a first aspect, this application provides a liquid delivery tube, which is hollow and has an inner wall surface, an outer wall surface, and a blood passage hole, wherein the blood passage hole penetrates the inner wall surface and the outer wall surface; the liquid delivery tube also has a hole wall defining the blood passage hole, wherein the inner edge of the hole wall is connected to the inner wall surface, and the outer edge of the hole wall is connected to the outer wall surface; at least a portion of the hole wall is arc-shaped from its inner edge to its outer edge, and the center of the circle containing the arc-shaped portion of the hole wall is located between the inner wall surface and the outer wall surface.

[0005] In one embodiment, the orifice wall includes a first sidewall and a second sidewall, the first sidewall and the second sidewall being opposite each other circumferentially along the liquid delivery pipe, and both the first sidewall and the second sidewall being arc-shaped from their inner edge to their outer edge.

[0006] In one embodiment, the orifice wall further includes a third sidewall and a fourth sidewall, the third sidewall and the fourth sidewall being opposite each other along the axial direction of the liquid delivery pipe, and both the third sidewall and the fourth sidewall being arranged in an arc shape from their inner edge to their outer edge.

[0007] In one embodiment, the circle containing at least one of the first sidewall, the second sidewall, the third sidewall, and the fourth sidewall has a radius R, and the liquid delivery tube has a wall thickness S from the inner wall surface to the outer wall surface; wherein, 0.1mm≤S≤0.25mm, and S≤2R≤S+0.05mm.

[0008] In one embodiment, the line connecting the inner and outer edges of the arc-shaped hole wall is parallel to the direction of the wall thickness of the liquid delivery pipe, and the center of the circle containing the hole wall is located on the bisector of the wall thickness of the liquid delivery pipe.

[0009] In one embodiment, the liquid delivery tube further includes a third sidewall and a fourth sidewall, the third sidewall and the fourth sidewall being opposite each other along the axial direction of the liquid delivery tube; wherein,

[0010] The third sidewall includes a first inner arc surface and a first outer arc surface arranged radially along the liquid delivery pipe. The first inner arc surface and the first outer arc surface are both arranged in a circular arc shape along the radial direction and are smoothly connected. The radius of the circle containing the first outer arc surface is smaller than the radius of the circle containing the first inner arc surface.

[0011] And / or, the fourth sidewall includes a second inner arc surface and a second outer arc surface arranged radially along the liquid delivery pipe. The second inner arc surface and the second outer arc surface are both arranged in an arc shape along the radial direction and are smoothly connected. The radius of the circle containing the second inner arc surface is greater than the radius of the circle containing the second outer arc surface.

[0012] In one embodiment, the inner edge of the first inner arc surface is connected to the inner wall surface to form a first connection point, and the outer edge of the first outer arc surface is connected to the outer wall surface to form a second connection point. On the cross-section of the third sidewall, the second connection point is further away from the fourth sidewall than the first connection point.

[0013] The inner edge of the second inner arc surface is connected to the inner wall surface to form a third connection point, and the outer edge of the second outer arc surface is connected to the outer wall surface to form a fourth connection point. On the cross-section of the fourth side wall, the fourth connection point is farther away from the third side wall than the third connection point.

[0014] In one embodiment, the radius of the circle containing the first inner arc surface is smaller than the radius of the circle containing the second inner arc surface; the radii of the circles containing the first outer arc surface and the second outer arc surface are equal to the radii of the circles containing the first sidewall and the second sidewall.

[0015] In one embodiment, the first inner arc surface extends circumferentially along the liquid delivery tube and has a width in the radial direction of the liquid delivery tube. The width of the first inner arc surface is gradually reduced from its middle region to both ends, so that the first inner arc surface is crescent-shaped.

[0016] And / or, the second inner arc surface extends circumferentially along the liquid delivery pipe and has a width in the radial direction of the liquid delivery pipe, the width of the second inner arc surface being gradually reduced from its middle region to its two ends, so that the second inner arc surface is crescent-shaped.

[0017] In one embodiment, the liquid delivery tube serves as an outlet tube, and the end of the liquid delivery tube near the third sidewall is an inlet end, so that blood can enter the liquid delivery tube from the inlet end and flow out from the blood through-hole to the outside of the liquid delivery tube.

[0018] Alternatively, the delivery tube can serve as an inlet tube, with one end of the delivery tube near the third sidewall serving as an outlet, allowing blood to enter the delivery tube through the blood through-hole and flow out from the outlet.

[0019] Secondly, this application also provides a cannula assembly, the cannula assembly including a cannula and a liquid delivery tube as described in the above embodiments, the liquid delivery tube being connected to the cannula.

[0020] Thirdly, this application also provides a blood pump, which includes an impeller and a cannula assembly as described in the above embodiments, wherein the driving device is connected to the cannula assembly; the impeller is disposed inside the cannula assembly and is driven to rotate by the driving device.

[0021] In the fluid delivery tube of this application, at least a portion of the wall of the blood passage is configured as an arc shape from its inner edge to its outer edge. This makes the at least portion of the wall of the blood passage smooth and rounded from the inside to the outside (or from the outside to the inside). Furthermore, because this portion of the wall is arc-shaped, its inner edge smoothly transitions with the inner wall surface, and its outer edge also smoothly transitions with the outer wall surface. This reduces damage to blood cells caused by the wall of the passage as blood flows through, lowering the risk of blood being damaged by sharp structures. Therefore, the fluid delivery tube of this application can reduce the damage to blood flowing through the blood passage, thereby reducing the negative impact of the blood pump on human health during use.

[0022] Furthermore, compared to the traditional technique of setting rounded or chamfered corners at the junction of the orifice wall and the inner and outer wall surfaces, this application sets the orifice wall to an arc shape, which also makes the orifice wall smoothly transition from the inner edge to the outer edge. The curvature of the orifice wall is more uniform, which reduces the resistance of blood as it flows through the orifice wall, thereby helping to guide blood to pass through the blood passage quickly and improving the pumping efficiency. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a blood pump provided in one embodiment of this application.

[0024] Figure 2 This is a side view of the liquid delivery tube provided in one embodiment of this application.

[0025] Figure 3 for Figure 2 The shown is a cross-sectional view of the liquid delivery pipe along line AA.

[0026] Figure 4 for Figure 3 A magnified view of a portion of the liquid delivery tube at point B.

[0027] Figure 5 for Figure 2 The shown is a cross-sectional view of the liquid delivery pipe along the center CC line.

[0028] Figure 6 for Figure 2 A side view of part of the structure in the liquid delivery pipe shown.

[0029] Figure 7 for Figure 6 A side view of another perspective of the partial structure of the liquid delivery pipe shown.

[0030] Figure 8 for Figure 5 A magnified view of a portion of the liquid delivery tube at point D.

[0031] Figure 9 for Figure 5 A magnified view of a portion of the liquid delivery tube at point E.

[0032] Figure 10 for Figure 2 The liquid delivery tube shown is a cross-sectional view along line AA in another embodiment.

[0033] Figure 11 for Figure 10 A magnified view of a portion of the liquid delivery tube at point F.

[0034] Figure 12 for Figure 2 The liquid delivery tube shown is a cross-sectional view along line CC in another embodiment.

[0035] Figure 13 for Figure 12 A magnified view of a portion of the liquid delivery tube at point G.

[0036] Figure 14 for Figure 12 A magnified view of a portion of the liquid delivery tube at point H.

[0037] Figure 15 for Figure 2 A side view of another part of the liquid delivery pipe shown.

[0038] Figure 16 for Figure 15 The diagram shows an axonometric view of the liquid delivery pipe section from another perspective.

[0039] Figure 17 A schematic diagram of the structure of a blood pump is provided in another embodiment of this application.

[0040] Reference numerals: 10, blood pump; 20, cannula assembly; 21, blood inlet; 22, blood outlet; 100, delivery tube; 101, blood through-hole; 102, hole wall; 103, inner wall surface; 104, outer wall surface; 110, first side wall; 120, second side wall; 130, third side wall; 131, first inner arc surface; 132, first outer arc surface; 140, fourth side wall; 141, second inner arc surface; 142, second outer arc surface; 200, cannula; 300, drive device. Detailed Implementation

[0041] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0042] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0043] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0044] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0045] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0046] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0047] This application provides a fluid delivery tube and a blood pump. The blood pump can be an interventional blood pump, suitable for left ventricular assist, right ventricular assist, and increasing renal perfusion. It should be noted that in the field of medical device technology, the end of a medical device closer to the physician or operator is usually referred to as the proximal end, and the end farther from the physician or operator is referred to as the distal end.

[0048] Blood pumps typically include a drive unit, an impeller, and a cannula assembly. The delivery tube is connected to the cannula, and the impeller is housed within the cannula assembly and connected to the drive unit. The delivery tube has blood passages for blood to pass through. However, in conventional technologies, the walls of these blood passages often have sharp edges, which can easily damage blood cells as they flow through them.

[0049] To address the aforementioned problems, the inventors of this application propose a delivery tube, a cannula assembly, and a blood pump. The delivery tube has a blood passage connecting its interior and exterior, allowing it to be used as either an outlet or inlet tube. Furthermore, the delivery tube has a wall defining the blood passage, with at least a portion of the wall being arc-shaped, making it smooth and rounded from the inside out, thereby reducing damage to blood cells caused by the wall as blood flows through the delivery tube. The delivery tube, cannula assembly, and blood pump are described in detail below with reference to the accompanying drawings and specific embodiments.

[0050] See Figure 1 In one embodiment of the blood pump provided in this application, the blood pump 10 includes a cannula assembly 20, an impeller (not shown), and a drive device 300; wherein, the impeller is disposed within the cannula assembly 20, and the impeller is driven to rotate by the drive device, and when the impeller rotates, blood can flow through the cannula assembly 20, the cannula assembly 20 having a blood inlet 21 and a blood outlet 22. The cannula assembly 20 includes a cannula 200 and a delivery tube 100, the delivery tube 100 being connected to the cannula 200.

[0051] Among them, combined Figure 1 and Figure 2 Referring to the illustrated embodiment, the blood pump 10 is suitable for left ventricular assist. In this case, the delivery tube 100 of the blood pump 10 is connected to the proximal end of the cannula 200, and the delivery tube 100 serves as the outlet tube. The blood through-hole 101 of the delivery tube 100 forms the blood outlet 22, and the blood inlet 21 can be formed at the distal end of the cannula 200 or on an additional inlet tube connected to the distal end of the cannula 200. After the blood pump 10 is inserted into the patient's left ventricle, the blood inlet 11 of the blood pump 10 is located within the left ventricle, and the blood outlet 22 of the blood pump 10 is located within the aorta. The blood in the left ventricle (such as...) Figure 1 (As shown in J1) Blood can enter the blood pump 10 through the blood inlet 21 and be discharged into the aorta through the blood outlet 22.

[0052] Combination Figure 2 and Figure 17 Referring to the illustrated embodiment, the blood pump 10 is suitable for right ventricular assist. In this case, the delivery tube 100 of the blood pump 10 is connected to the proximal end of the cannula 200. The delivery tube 100 serves as an inlet tube. The blood through-hole 101 of the delivery tube 100 forms the blood inlet 21, and the blood outlet 22 can be formed at the distal end of the cannula 200 or on an outlet tube separately connected to the distal end of the cannula 200. After the blood pump 10 is inserted into the patient's right ventricle, the blood inlet 21 of the blood pump 10 is located within the right ventricle, and the blood outlet 22 of the blood pump 10 is located within the pulmonary artery. The blood in the right ventricle (such as...) Figure 17 (As shown in J2) Blood can enter the blood pump 10 through the blood inlet 21 and be discharged into the pulmonary artery through the blood outlet 22.

[0053] Of course, in other embodiments, the cannula assembly 20 in the blood pump 10 may also include two delivery tubes 100, one of which is connected to one end of the cannula 200 to serve as an outlet tube, and the blood through hole 101 of the delivery tube 100 forms a blood outlet 22; the other delivery tube 100 is connected to the other end of the cannula 200 to serve as an inlet tube, and the blood through hole 101 of the delivery tube 100 forms a blood inlet 21.

[0054] Please see Figures 2 to 4 In one embodiment of the liquid delivery tube 100, the liquid delivery tube 100 is hollow and has an inner wall surface 103, an outer wall surface 104, and a blood passage 101, which penetrates the inner wall surface 103 and the outer wall surface 104. The liquid delivery tube 100 also has a hole wall 102 defining the blood passage 101, with the inner edge of the hole wall 102 connected to the inner wall surface 103 and the outer edge of the hole wall 102 connected to the outer wall surface 104. At least a portion of the hole wall 102 is arc-shaped from its inner edge to its outer edge, and the center of the circle containing the arc-shaped portion of the hole wall 102 is located between the inner wall surface 103 and the outer wall surface 104.

[0055] Specifically, the delivery tube 100 is cylindrical. The delivery tube 100 has multiple blood passages 101, which are arranged at intervals along the circumference of the delivery tube 100. The blood passages 101 can be any of the following: circular, square, elliptical, or rounded rectangular. All the walls 102 of the blood passages 101 can be arc-shaped from their inner edge to their outer edge; or, a portion of the wall 102 can be arc-shaped from its inner edge to its outer edge. The distribution of the inner edges of the wall 102 is as follows: Figure 4 As shown in P1, the distribution positions of the outer edge of the hole wall 102 are as follows: Figure 4 As shown in P2.

[0056] In the fluid delivery tube 100 of this application, at least a portion of the wall 102 of the blood passage 101 is configured as an arc shape from its inner edge to its outer edge, making the at least portion of the wall 102 of the blood passage 101 smooth and rounded from the inside to the outside (or from the outside to the inside). Furthermore, because this portion of the wall 102 is arc-shaped, its inner edge smoothly transitions to the inner wall surface 103, and its outer edge smoothly transitions to the outer wall surface 104. This reduces damage to blood cells caused by the wall 102 when blood flows through the blood passage 101, lowering the risk of blood being damaged by sharp structures. Therefore, the fluid delivery tube 100 of this application can reduce the damage to blood when it flows through the blood passage 101, thereby reducing the negative impact of the blood pump 10 on human health during use.

[0057] Furthermore, compared to the traditional method of rounding or chamfering at the junction of the orifice wall and the inner and outer wall surfaces, this application sets the orifice wall 102 in an arc shape. This allows the orifice wall 102 to smoothly transition from the inner edge to the outer edge, resulting in a more uniform curvature and reduced resistance to blood flow. Moreover, because the orifice wall 102 is arc-shaped, the areas near the inner and outer edges of the orifice wall 102 have a roughly symmetrical shape. Taking the outward discharge of blood from the blood passage 101 as an example, some blood flows along the inner edge of the orifice wall 102, adhering to the wall, towards the outer edge. During this process, the blood experiences a funnel-like inward guiding effect, which facilitates the rapid flow of blood through the blood passage 101, improving pumping efficiency. Therefore, this application not only reduces damage to blood flowing through the blood passage 101 of the delivery tube 100 but also improves pumping efficiency.

[0058] Please see Figure 2 and Figure 4 In one embodiment, the orifice wall 102 includes a first sidewall 110 and a second sidewall 120, which are circumferentially opposite each other along the liquid delivery pipe 100. The first sidewall 110 and the second sidewall 120 are arranged in an arc shape from the inner edge to the outer edge. This arrangement can reduce the damage to blood cells when blood flows from the inner edge to the outer edge in the region of the first sidewall 110 and the second sidewall 120, and also reduce the damage to blood cells when blood flows from the outer edge to the inner edge. At the same time, it can also facilitate the guidance of blood flow on the first sidewall 110 and the second sidewall 120.

[0059] Please see Figures 6 to 9 In one embodiment, the orifice wall 102 further includes a third sidewall 130 and a fourth sidewall 140, which are opposite each other along the axial direction of the liquid delivery pipe 100. The axial direction refers to the length direction of the liquid delivery pipe 100. Both the third sidewall 130 and the fourth sidewall 140 are arc-shaped from their inner edge to their outer edge. This arrangement reduces damage to blood cells as blood flows from the inner edge to the outer edge in the region of the third sidewall 130 and the fourth sidewall 140, and also reduces damage to blood cells as blood flows from the outer edge to the inner edge. It also facilitates the guidance of blood flow along the third sidewall 130 and the fourth sidewall 140.

[0060] It is understandable that, such as Figure 2 As shown, the first sidewall 110, the second sidewall 120, the third sidewall 130 and the fourth sidewall 140 are connected end to end to define the blood passage 101, so that the blood passage 101 is rectangular or rounded rectangle.

[0061] Please see Figure 3 and Figure 4 In one embodiment, the circle containing at least one of the first sidewall 110, the second sidewall 120, the third sidewall 130, and the fourth sidewall 140 has a radius R, and the liquid delivery pipe 100 has a wall thickness S from the inner wall surface 103 to the outer wall surface 104. Wherein, 0.1mm ≤ S ≤ 0.25mm, and S ≤ 2R ≤ S + 0.05mm. The value of S can be, but is not limited to, 0.12mm, 0.15mm, 0.18mm, 0.20mm, 0.23mm, etc.

[0062] Of course, R can be equal to S. That is to say, the circle containing at least one of the first sidewall 110, the second sidewall 120, the third sidewall 130 and the fourth sidewall 140 is a semicircle. Thus, without additional smoothing transition, the inner edge and outer edge of the hole wall 102 can be tangent to the inner wall surface 103 and the outer wall surface 104, respectively, thereby reducing the sharp area on the liquid delivery pipe 100 and reducing the number of processing steps for the hole wall 102.

[0063] Please see Figure 4 In one embodiment, the line connecting the inner and outer edges of the arc-shaped orifice wall 102 is parallel to the direction of the wall thickness S of the liquid delivery pipe 100, that is, the connecting line extends radially along the liquid delivery pipe 100. The center of the circle containing the orifice wall 102 is located on the bisector of the wall thickness S of the liquid delivery pipe 100. With this configuration, the arc-shaped portion of the orifice wall 102 located near the inner side of the liquid delivery pipe 100 along the bisector has the same or nearly the same span as the arc-shaped portion of the orifice wall 102 located near the outer side of the liquid delivery pipe 100 along the bisector; that is, the cross-section of the arc-shaped orifice wall 102 is semi-circular.

[0064] Specifically, taking the first sidewall 110 as an example, in such a case... Figure 4In the cross-section shown, the connection point between the first sidewall 110 and the inner wall surface 103 is P1; the connection point between the first sidewall 110 and the outer wall surface 104 is P2; the center of the circle containing the first sidewall 110 is O; P3 is the intersection of the bisector of the pipe wall thickness at this cross-section and the hole wall 102, that is, the highest point of the first sidewall 110 located between P1 and P2 and farthest from line segment P1P2. It can be understood that the direction of the pipe wall thickness S is the radial direction of the liquid delivery pipe 100, so line segment P1P2 is parallel to the direction of the pipe wall thickness, that is, P1 and P2 are located in the same radial direction. Furthermore, since the center of the circle containing the first sidewall 110 is located on the bisector of the pipe wall thickness of the liquid delivery pipe 100, the arc of arc P3P1 is equal to the arc of arc P3P2. Thus, when the liquid delivery tube 100 is used as the outlet tube, the guiding effect of the arc surface of the corresponding arc P3P1 of the first side wall 110 on the blood is basically the same as the guiding effect of the arc surface of the corresponding arc P3P2 of the first side wall 110 on the blood, thereby balancing the guiding effect of the hole wall 102.

[0065] Taking the delivery tube 100 as the outlet tube as an example, the blood flows from the inside to the outside at the blood passage 101. With P3 as the boundary, along the blood flow direction, the arc surface where the curve P3P1 is located is roughly funnel-shaped, which guides the blood in the delivery tube 100 into the blood passage 101. Along the blood flow direction, the arc surface where the curve P3P2 is located is roughly trumpet-shaped, which guides the blood outward diffusion, facilitating the rapid outflow of blood to the outside of the blood passage 101. In this embodiment, this arrangement ensures that the guiding effect of the arc surface where the curve P3P1 is located and the arc surface where the curve P3P2 is located is approximately the same, balancing the different guiding effects of the blood flowing through the blood passage 101 and receiving the blood from the orifice wall 102, thus improving the efficiency of blood inflow and outflow from the blood passage 101.

[0066] It should be understood that when the liquid delivery tube 100 is used as the inlet tube, the guiding effect of the first side wall 110, the second side wall 120, the third side wall 130, and the fourth side wall 140 of the orifice wall 102 on the blood is the same as described above, so they will not be described in detail here.

[0067] Please see Figure 4 In one embodiment, the wall thickness of the liquid delivery pipe 100 is uniform throughout, meaning the wall thickness at all points on the liquid delivery pipe 100 is S. Of course, the liquid delivery pipe 100 can also have protruding or recessed portions depending on actual needs. In each embodiment, only the wall thickness from the junction of the inner wall surface 103 and the inner edge to the junction of the outer wall surface 104 and the outer edge is discussed. The wall thickness of other parts of the liquid delivery pipe 100 can be set according to actual needs, and therefore will not be elaborated further. The wall thickness S can be between 0.10 mm and 0.25 mm, i.e., 0.1 mm ≤ S ≤ 0.25 mm.

[0068] Please see Figure 4 and combined Figure 8 and Figure 9 In one embodiment, the arc and radius of the circles containing the third sidewall 130 and the fourth sidewall 140 are the same as the arc and radius of the circles containing the first sidewall 110 and the second sidewall 120.

[0069] Please see Figure 12 In one embodiment, the delivery tube 100 serves as the outlet tube, and the end of the delivery tube 100 closest to the third sidewall 130 is the inlet end (i.e., the distal end). Blood can enter the delivery tube 100 from the inlet end and then flow outward from the blood passage 101 of the delivery tube 100, meaning that the third sidewall 130 can guide the blood before the fourth sidewall 140. For ease of understanding and description, the following embodiments will use the example of the third sidewall 130 being closer to the distal end of the outlet tube than the fourth sidewall 140. It should be understood that the third sidewall 130 and the fourth sidewall 140 are arranged approximately symmetrically, so it is also reasonable to set the fourth sidewall 140 closer to the distal end of the outlet tube than the third sidewall 130, and therefore will not be repeated.

[0070] In one embodiment, the shape, structure, and size of the third sidewall 130 and the fourth sidewall 140 may be the same as or at least partially different from those of the first sidewall 110 and the second sidewall 120, depending on actual needs.

[0071] Please see Figures 10 to 14 In one embodiment, unlike the previous embodiment where the third sidewall 130 is set as a regular arc shape, the third sidewall 130 in this embodiment includes a first inner arc surface 131 and a first outer arc surface 132 arranged radially along the liquid delivery pipe 100; the first inner arc surface 131 and the first outer arc surface 132 are both arranged in an arc shape along the pipe wall thickness S direction and are smoothly connected.

[0072] Specifically, the inner edge of the first inner arc surface 131 is connected to the inner wall surface 103 to form a first connection point Q1, and the outer edge of the first inner arc surface 131 is smoothly connected to the inner edge of the first outer arc surface 132 to form a connection point Q. A The outer edge of the first outer arc surface 132 connects to the outer wall surface 104 to form a second connection point Q2. The connection point Q... A This is the highest point on the third sidewall 130 with the greatest distance from Q1 or Q2. The first inner arc surface 131 extends from the first connection point Q1 to the junction Q1 where the first inner arc surface meets the first outer arc surface. A The first outer arc surface 132 is arranged in an arc shape from the connection point QA to the second connection point Q2, so as to guide blood flow and reduce damage to blood cells.

[0073] Taking the delivery pipe 100 as an outlet pipe as an example, when blood inside the delivery pipe 100 passes through the blood through-hole 101, it first flows from the first inner arc surface 131 to the first outer arc surface 132. The third sidewall 130, as one of the structures defining the formation of the blood through-hole 101, allows blood to flow in and out when passing through it. Figures 11 to 14 The directions K1 and K2 shown are the blood flow directions. K1 is the direction in which blood flows out of the blood passage 101; K2 is the direction in which blood flows in the delivery tube 100, that is, from the distal end to the proximal end.

[0074] Optionally, the radius R1 of the circle containing the first inner arc surface 131 is set to be greater than the radius R2 of the circle containing the first outer arc surface 132, i.e., R1 > R2. It should be noted that for an arc surface, the smaller the radial dimension of the corresponding circle, the steeper its surface. That is, the steepness of the first inner arc surface 131 is relatively gentler than that of the first outer arc surface 132, while the first outer arc surface 132 is steeper. This facilitates the flow of blood from the first inner arc surface 131 to the first outer arc surface 132 and out of the liquid delivery tube 100.

[0075] Furthermore, the second connection Q2 is farther from the fourth sidewall 140 in the axial direction of the delivery pipe 100 than the first connection Q1, meaning the second connection Q2 is located at the distal end relative to the first connection Q1. That is, line segments Q1 and Q2 are not parallel to the direction of the wall thickness of the delivery pipe 100. When blood is outwardly discharged by the third sidewall 130, the guiding distance of the third sidewall 130 in discharging blood can be extended, thereby improving the diffusion effect of the third sidewall 130 on the outflowing blood and allowing the blood to flow out rapidly. (See also...) Figure 13 The distance T1 between the first connection Q1 and the second connection Q2 along the axial direction of the liquid delivery pipe 100 is 0.02mm≤T1≤0.05mm. The size of T1 can be adjusted according to the actual parameters of the liquid delivery pipe 100.

[0076] In one embodiment, similar in shape to the aforementioned third sidewall 130, the fourth sidewall 140 includes a second inner arc surface 141 and a second outer arc surface 142 arranged radially along the liquid delivery pipe 100; the second inner arc surface 141 and the second outer arc surface 142 are both arranged in an arc shape along the radial direction and are smoothly connected.

[0077] Specifically, the inner edge of the second inner arc surface 141 is connected to the inner wall surface 103 to form a third connection point Q3, and the outer edge of the second inner arc surface 141 is smoothly connected to the inner edge of the second outer arc surface 142 to form a connection point Q. B The outer edge of the second outer arc surface 142 connects to the outer wall surface 104 to form a fourth connection point Q4. The connection point Q... BThis is the highest point on the fourth sidewall 140 that is furthest from Q1 or Q2. The second inner arc surface 141 extends from the third connection point Q3 to the connection point Q. B It is arranged in an arc shape, and the second outer arc surface 142 extends from the connection point Q. B The fourth connection point, Q4, is designed in an arc shape to facilitate blood flow and reduce damage to blood cells.

[0078] Optionally, the radius R3 of the circle containing the second inner arc surface 141 is set to be greater than the radius R4 of the circle containing the second outer arc surface 142, i.e., R3 > R4. Similarly, this setting makes the steepness of the second inner arc surface 141 relatively gentler than that of the second outer arc surface 142, while the second outer arc surface 142 is steeper, which facilitates the flow of blood from the second inner arc surface 141 to the second outer arc surface 142 and out of the delivery tube 100.

[0079] Furthermore, the fourth connection Q4 is further away from the third sidewall 130 in the axial direction of the liquid delivery tube 100 than the third connection Q3, meaning the fourth connection Q4 is located proximal to the third connection Q3. This arrangement can relatively improve the diffusion effect of the second outer arc surface 142 on the outflowing blood, allowing the blood to flow out rapidly. (See also...) Figure 14 The distance between the third connection Q3 and the fourth connection Q4 along the axial direction of the liquid delivery pipe 100 is T2, where 0.02mm ≤ T2 ≤ 0.05mm. The dimension of T2 can be adjusted according to the actual parameters of the liquid delivery pipe 100. T2 can be equal to T1.

[0080] Please see Figure 13 When the delivery tube 100 serves as the outlet tube, the third sidewall 130 can be located at the distal end of the delivery tube 100 relative to the fourth sidewall 140, meaning the blood first passes through the third sidewall 130 and then the fourth sidewall 140. Here, to allow more blood to exit from the blood passage 101 as early as possible, in this embodiment, the radius R1 of the circle containing the first inner arc surface 131 can be set to be smaller than the radius R3 of the circle containing the second inner arc surface 141, i.e., R1 < R3. It is understood that for an arc surface, the smaller the radius, the greater the curvature. The first inner arc surface 131 serves as the first point of contact for blood to turn radially from the axial direction on the delivery tube 100. Setting the curvature of the first inner arc surface 131 to be large reduces its resistance to the turning of blood, thereby improving the smoothness of blood entering the blood passage 101 at the first inner arc surface 131, i.e., improving blood flow smoothness.

[0081] Please see Figure 13 and Figure 14In one embodiment, the radius of the circle containing the inner arc surface on the same sidewall of the hole wall 102 is always greater than the radius of the circle containing the outer arc surface on the same sidewall, meaning the steepness of the inner arc surface is always gentler to facilitate blood flow. Regarding the relationship between the radii of the circles containing the various sidewalls in each embodiment, the radius of the circle containing the first sidewall 110 and / or the second sidewall 120 is R; the radius of the circle containing the first inner arc surface 131 is R1, and the radius of the circle containing the first outer arc surface 132 is R2; the radius of the circle containing the second inner arc surface 141 is R3, and the radius of the circle containing the second outer arc surface 142 is R4. The radii R2 of the circle containing the first outer arc surface 132 and R4 of the circle containing the second outer arc surface 142 are equal to the radius R of the circle containing the first sidewall 110 or the second sidewall 120, i.e., R2 = R4 = R. In other words, in each embodiment, R3 > R1 > R2 = R4 = R. Of course, other structural dimensions can also be provided for each sidewall according to actual needs.

[0082] Please see Figure 15 In one embodiment, the first inner arc surface 131 extends circumferentially along the liquid delivery pipe 100 and has a radial width along the liquid delivery pipe 100. The width of the first inner arc surface 131 gradually decreases from its middle region to its two ends, making the first inner arc surface 131 crescent-shaped. That is, the width of the first inner arc surface 131 is the largest in the middle region and the width of the two ends is the smallest. In this way, the stress at the two ends of the first inner arc surface 131 at the corners of the blood passage 101 (the corners where the first sidewall 110, the second sidewall 120, and the two ends of the third sidewall 130 are connected) can be reduced, and the flow-guiding surface area of ​​the middle region of the first inner arc surface 131 can be increased, thereby improving the flow-guiding effect of the third sidewall 130 and allowing blood to flow out more smoothly. The circumferential direction of the pipe wall described in each embodiment is referred to [reference needed]. Figure 15 and Figure 16 M.

[0083] Please see Figure 16 In one embodiment, the second inner arc surface 141 extends circumferentially along the liquid delivery pipe 100 and has a width in the radial direction along the liquid delivery pipe 100. The width of the second inner arc surface 141 gradually decreases from its middle region to its two ends, so that the second inner arc surface 141 is crescent-shaped. In this way, the stress at the two ends of the second inner arc surface 141 at the corners of the blood passage 101 (the corners where the first sidewall 110 and the second sidewall 120 connect to the two ends of the fourth sidewall 140, respectively) can be reduced, and the flow-guiding surface area of ​​the middle region of the second inner arc surface 141 can be increased, so that blood can flow out from the two ends of the second inner arc surface 141 to its middle region, thereby improving the guiding effect of the fourth sidewall 1340 and making the blood flow out more smoothly.

[0084] In one embodiment, the delivery tube 100 can be used as an outlet tube, with one end of the delivery tube 100 near the third sidewall 130 of the blood passage 101 serving as the inlet end, allowing blood to enter the delivery tube 100 from the inlet end and flow out from the blood passage 101 to the outside of the delivery tube 100. Alternatively, in another embodiment, the delivery tube 100 can also be used as an inlet tube, with one end of the delivery tube 100 near the third sidewall 130 of the blood passage 101 serving as the outlet end, allowing blood to enter the delivery tube 100 from the blood passage 101 and flow out from the outlet end.

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

[0086] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A liquid delivery tube, characterized in that, The liquid delivery tube is hollow and has an inner wall surface, an outer wall surface, and a blood passage hole, with the blood passage hole penetrating through the inner wall surface and the outer wall surface; The delivery tube also has a hole wall defining the blood passage, the inner edge of the hole wall is connected to the inner wall surface, the outer edge of the hole wall is connected to the outer wall surface, and the hole wall includes a third side wall and a fourth side wall, the third side wall and the fourth side wall being opposite each other along the axial direction of the delivery tube; At least a portion of the hole wall is arc-shaped from its inner edge to its outer edge, and the center of the circle containing the arc-shaped portion of the hole wall is located between the inner wall surface and the outer wall surface. The third sidewall includes a first inner arc surface and a first outer arc surface arranged radially along the liquid delivery pipe. The first inner arc surface and the first outer arc surface are both arranged in a circular arc shape along the radial direction and are smoothly connected. The radius of the circle containing the first inner arc surface is larger than the radius of the circle containing the first outer arc surface. And / or, the fourth sidewall includes a second inner arc surface and a second outer arc surface arranged radially along the liquid delivery pipe. The second inner arc surface and the second outer arc surface are both arranged in an arc shape along the radial direction and are smoothly connected. The radius of the circle containing the second inner arc surface is greater than the radius of the circle containing the second outer arc surface.

2. The liquid delivery tube according to claim 1, characterized in that, The orifice wall includes a first sidewall and a second sidewall, which are opposite each other along the circumference of the liquid delivery pipe. Both the first sidewall and the second sidewall are arranged in an arc shape from their inner edge to their outer edge.

3. The liquid delivery tube according to claim 2, characterized in that, The center of the circle containing the first sidewall is located on the bisector of the thickness of the liquid delivery pipe wall.

4. The liquid delivery tube according to claim 2, characterized in that, The circle containing at least one of the first sidewall and the second sidewall has a radius R, and the liquid delivery tube has a wall thickness S from the inner wall surface to the outer wall surface; Where 0.1mm≤S≤0.25mm, and S≤2R≤S+0.05mm.

5. The liquid delivery tube according to any one of claims 1 to 4, characterized in that, The line connecting the inner and outer edges of the arc-shaped hole wall is parallel to the direction of the wall thickness of the liquid delivery pipe, and the center of the circle containing the hole wall is located on the bisector of the wall thickness of the liquid delivery pipe.

6. The liquid delivery tube according to claim 1, characterized in that, The inner edge of the first inner arc surface is connected to the inner wall surface to form a first connection point, and the outer edge of the first outer arc surface is connected to the outer wall surface to form a second connection point. On the cross-section of the third side wall, the second connection point is further away from the fourth side wall than the first connection point. The inner edge of the second inner arc surface is connected to the inner wall surface to form a third connection point, and the outer edge of the second outer arc surface is connected to the outer wall surface to form a fourth connection point. On the cross-section of the fourth side wall, the fourth connection point is farther away from the third side wall than the third connection point.

7. The liquid delivery tube according to claim 6, characterized in that, The distance between the third connection and the fourth connection in the axial direction of the liquid delivery pipe is T2, wherein 0.02mm≤T2≤0.05mm.

8. The liquid delivery tube according to claim 2, characterized in that, The radius of the circle containing the first inner arc surface is smaller than the radius of the circle containing the second inner arc surface; the radii of the circles containing the first outer arc surface and the second outer arc surface are equal to the radii of the circles containing the first sidewall and the second sidewall.

9. The liquid delivery tube according to claim 1, characterized in that, The first inner arc surface extends circumferentially along the liquid delivery pipe and has a width in the radial direction of the liquid delivery pipe. The width of the first inner arc surface gradually decreases from its middle region to both ends, so that the first inner arc surface is crescent-shaped. And / or, the second inner arc surface extends circumferentially along the liquid delivery pipe and has a width in the radial direction of the liquid delivery pipe, the width of the second inner arc surface being gradually reduced from its middle region to its two ends, so that the second inner arc surface is crescent-shaped.

10. The liquid delivery tube according to claim 1, characterized in that, The liquid delivery tube serves as the outlet tube, and the end of the liquid delivery tube closest to the third side wall is the inlet end, so that blood can enter the liquid delivery tube from the inlet end and flow out from the blood passage to the outside of the liquid delivery tube. Alternatively, the delivery tube can serve as an inlet tube, with one end of the delivery tube near the third sidewall serving as an outlet, allowing blood to enter the delivery tube through the blood through-hole and flow out from the outlet.

11. A sleeve assembly, characterized in that, The sleeve assembly includes: Sleeve; and The liquid delivery tube as described in any one of claims 1 to 10, wherein the liquid delivery tube is connected to the sleeve.

12. A blood pump, characterized in that, The blood pump includes: Drive unit; Impeller; and As claimed in claim 11, the drive device is connected to the sleeve assembly; the impeller is disposed within the sleeve assembly and is driven to rotate by the drive device.

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