Cylindrical membrane oxygenator

Abstract

The utility model provides a cylindrical membrane oxygenator which comprises a shell assembly and a liquid separation column, and the shell assembly comprises a first end cover assembly, a barrel assembly and a second end cover assembly. The barrel assembly comprises an inner barrel, a middle barrel and an outer barrel. The inner barrel comprises a first barrel part, a plurality of liquid separation fins and a second barrel part. A liquid separation cavity is defined by one axial end of the liquid separation column and the first barrel part, the other end of the liquid separation column is connected with the second barrel part, the peripheral face of the liquid separation column is connected with the first barrel part through liquid separation fins, and a liquid separation groove with the large upper portion and the small lower portion is formed among every two adjacent liquid separation fins, the liquid separation column and the heat exchange film wires. A liquid outlet channel is formed in the end, away from the liquid inlet channel, of the outer cylinder, and the liquid inlet channel communicates with the liquid outlet channel through the liquid separation cavity and the liquid separation groove. Based on the structural design of the liquid separation tank, the oxygenator can utilize different membrane areas under different flow rates, the oxygenation efficiency under the high flow rate is guaranteed, and it is guaranteed that the problems of excessive oxygenation of blood and excessive carbon dioxide removal are avoided under the low flow rate.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a cylindrical membrane oxygenator. Background Technology

[0002] Membrane oxygenators are the core components of extracorporeal circulation (CPB) and extracorporeal membrane oxygenation (ECMO). Their function is to replace the human lung function in the exchange of blood and gases, thereby achieving blood oxygenation and carbon dioxide removal, and changing the blood from venous blood to arterial blood.

[0003] When blood flows through a membrane oxygenator, the hollow fiber membrane acts as a semi-permeable membrane, allowing oxygen in the gas path to enter the blood from the side with higher gas concentration, and carbon dioxide in the blood path to enter the gas path from the side with higher blood concentration.

[0004] When blood flow is high, blood passes through the membrane oxygenator rapidly, resulting in a shorter time for gas exchange between the blood and the external environment. To ensure sufficient gas exchange efficiency at high blood flow rates, a larger membrane area is typically used in the design of membrane oxygenators. However, at lower blood flow rates, blood remains in the membrane oxygenator for a longer period. If the same oxygenation area is used as at high flow rates, the blood becomes oversaturated with oxygen, and excessive carbon dioxide is removed, which can clinically lead to phenomena such as "oxygen toxicity" and "alkalosis" in patients.

[0005] Therefore, how to simultaneously ensure oxygenation efficiency at high flow rates and prevent excessive blood oxygenation and carbon dioxide clearance at lower flow rates is an urgent problem to be solved in this field. Utility Model Content

[0006] To solve the above problems, this utility model proposes a cylindrical membrane oxygenator.

[0007] This invention proposes a cylindrical membrane oxygenator, comprising a shell assembly and a distributing column. The shell assembly includes a first end cap assembly, a cylindrical body assembly, and a second end cap assembly arranged sequentially along its axial direction. The cylindrical body assembly includes an inner cylinder, a middle cylinder, and an outer cylinder arranged from the inside out. A heat exchange cavity is formed between the inner cylinder and the middle cylinder, and an oxygenation cavity is formed between the middle cylinder and the outer cylinder. Heat exchange membranes and oxygenation membranes are encapsulated inside the heat exchange cavity and the oxygenation cavity, respectively. The inner cylinder includes a first cylindrical body portion, multiple distributing fins, and a second cylindrical body portion arranged sequentially along the axial direction. The distributing column is spaced apart from the first cylindrical body portion at one end along the axial direction and forms a distributing cavity communicating with the heat exchange cavity and the oxygenation cavity. The other end is connected to the second cylindrical body portion. The outer circumferential surface of the distributing column is connected to the first cylindrical body portion through the distributing fins, and adjacent distributing fins form distributing grooves that are larger at the top and smaller at the bottom between the distributing column and the heat exchange membranes. The first end cap assembly has a liquid inlet channel, and the outer cylinder has a liquid outlet channel at the end away from the liquid inlet channel. The liquid inlet channel is connected to the liquid outlet channel through the liquid distribution chamber and the liquid distribution trough.

[0008] Furthermore, the cross-section of the liquid-distributing column is arranged to increase sequentially from the first cylindrical part toward the second cylindrical part, so as to form a liquid-distributing groove that is larger at the top and smaller at the bottom with the liquid-distributing fins and the heat exchange membrane filaments.

[0009] Furthermore, the plurality of distributing fins includes a first distributing fin and a second distributing fin, which are spaced apart on the outer peripheral surface of the distributing column. The first distributing fin is connected to the first cylindrical portion, while the second distributing fin is not connected to the first cylindrical portion.

[0010] Furthermore, at least a portion of the inlet channel extends obliquely relative to the axial direction, and the outlet channel extends radially in the housing assembly, with the inlet of the inlet channel and the outlet of the outlet channel located in the same plane. The inlet channel includes a first inlet section and a second inlet section connected in sequence, the second inlet section being located between the first inlet section and the dispensing chamber. The extending direction of the second inlet section is perpendicular to the extending direction of the outlet channel, and the angle between the extending direction of the first inlet section and the extending direction of the outlet channel is 30°-60°.

[0011] Furthermore, the middle cylinder is provided with multiple rows of through holes; the height of the multiple rows of through holes in the axial direction decreases sequentially from the first cylinder portion toward the second cylinder portion.

[0012] Furthermore, the through holes in adjacent rows are staggered.

[0013] Furthermore, the diameter of the inner wall of the outer cylinder near the liquid inlet channel is smaller than the diameter of the inner wall away from the liquid inlet channel.

[0014] Furthermore, the gap between the inner wall of the outer cylinder near the liquid outlet channel and the oxygenation membrane filament is larger than the gap between the inner wall of other parts of the outer cylinder and the oxygenation membrane filament.

[0015] Further, the first end cap assembly includes a first end cap housing and a first channel member. The first end cap housing forms an air inlet chamber and an air inlet channel that are interconnected, and the extending direction of the air inlet channel is tangential to the inner wall of the air inlet chamber. The first channel member forms the liquid inlet channel, and the first channel member and the first end cap housing form a water inlet chamber. The second end cap assembly forms an air outlet chamber communicating with the air inlet chamber and a water outlet chamber communicating with the water inlet chamber.

[0016] Furthermore, the second end cap assembly also forms an air outlet channel communicating with the air outlet chamber. The extension direction of the air outlet channel is tangential to the inner wall of the air outlet chamber, and the air outlet direction of the air outlet channel is opposite to the air inlet direction of the air inlet channel.

[0017] Furthermore, the first end cap housing also forms a water inlet channel communicating with the water inlet cavity, and the air outlet channel and the air inlet channel are located on both sides of the water inlet channel in the radial direction of the housing assembly.

[0018] Furthermore, the second end cap assembly also forms a water outlet channel communicating with the water outlet cavity, and the air outlet channel and the air inlet channel are located on both sides of the water outlet channel in the radial direction of the housing assembly.

[0019] The beneficial effects of this utility model are as follows:

[0020] In the cylindrical membrane oxygenator of this application, the first end cap assembly is located at one end of the cylinder assembly (i.e., the upper part of the membrane oxygenator) and forms an inlet channel. The outlet channel (i.e., the bleeding port) is located at the end of the outer cylinder away from the inlet channel (i.e., the lower part of the membrane oxygenator). In order to guide the blood in the upper inlet channel into the lower outlet channel, this application sets a liquid distribution groove structure that is larger at the top and smaller at the bottom, so that the blood can be guided from the liquid distribution chamber at the top of the oxygenator to the lower part of the oxygenator along the liquid distribution groove. Therefore, when the blood flow rate is high, the upper-wide and lower-narrow distribution channel design facilitates the upward axial movement of blood in the oxygenator, allowing the blood to flow relatively evenly through the gaps between the upper and lower heat exchange membrane fibers (i.e., the heat exchange chamber) and the oxygenation membrane fiber gaps (i.e., the oxygenation chamber). This prevents blood from flowing directly away from the lower part of the oxygenator, avoiding the "short circuit" phenomenon that would result in low membrane fiber utilization. When the blood flow rate is low, the upper-wide and lower-narrow distribution channel design allows the blood to flow more easily from the upper part of the oxygenator to the lower part due to gravity, passing through the lower heat exchange membrane fiber gaps and oxygenation membrane fiber gaps. This results in lower utilization of the upper heat exchange membrane fiber and oxygenation membrane fiber, thus preventing excessive oxygenation and excessive carbon dioxide removal of the blood.

[0021] Therefore, based on the structural design of the liquid separator, the oxygenator of this application can utilize different membrane areas at different flow rates, ensuring both oxygenation efficiency at high flow rates and preventing excessive blood oxygenation and excessive carbon dioxide removal at lower flow rates.

[0022] The utility model summary section is provided to present the chosen concepts in a simplified form, which will be further described in the detailed embodiments below. The utility model summary section is not intended to identify essential or essential features of this disclosure, nor is it intended to limit the scope of this disclosure. Attached Figure Description

[0023] The above and other objects, features and advantages of this disclosure will become more apparent from the accompanying drawings, in which like reference numerals generally denote like parts.

[0024] Figure 1 A perspective view of the cylindrical membrane oxygenator of this utility model is shown;

[0025] Figure 2 for Figure 1 Front view of a cylindrical membrane oxygenator;

[0026] Figure 3 An exploded view of the cylindrical membrane oxygenator of this utility model is shown;

[0027] Figure 4The internal structure of the cylindrical membrane oxygenator of this utility model is shown from a certain perspective.

[0028] Figure 5 This diagram shows the internal structure of the cylindrical membrane oxygenator of this invention from another perspective.

[0029] Figure 6 A perspective view of the first end cap assembly of the cylindrical membrane oxygenator of this utility model is shown.

[0030] Figure 7 A perspective view of the inner cylinder of the cylindrical membrane oxygenator of this utility model is shown.

[0031] The reference numerals in the attached figures are as follows:

[0032] 10. Housing assembly;

[0033] 11. First end cap assembly; 111. First end cap housing; 1111. Ring portion; 1112. First extension portion; 1113. Second extension portion; 112. First channel component;

[0034] 12. Cylinder assembly; 121. Inner cylinder; 1211. First cylinder section; 1212. Liquid distribution fin; 1212A. First liquid distribution fin; 1212B. Second liquid distribution fin; 1213. Second cylinder section; 122. Middle cylinder; T1. Through hole; 123. Outer cylinder; 13. Second end cap assembly; 131. Second end cap housing; 132. Second channel component;

[0035] 20. Separating column;

[0036] A1, Liquid Inlet Channel; A11, First Liquid Inlet Section; A12, Second Liquid Inlet Section; B1, Liquid Separation Chamber; B2, Heat Exchange Chamber; B3, Oxygenation Chamber; E1, Air Inlet Chamber; E2, Air Outlet Chamber; F1, Water Inlet Chamber; F2, Water Outlet Chamber; F3, Water Inlet Channel; F4, Water Outlet Channel;

[0037] C. Axial; D. Radial. Detailed Implementation

[0038] Embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art.

[0039] The term "comprising" and its variations as used herein signify open inclusion, i.e., "including but not limited to". Unless otherwise stated, the term "or" means "and / or". The term "based on" means "at least partially based on". The terms "one example embodiment" and "one embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first", "second", etc., may refer to different or the same objects. Other explicit and implicit definitions may also be included below.

[0040] The following reference Figure 1-7 The cylindrical membrane oxygenator of the present application embodiment is described below.

[0041] Reference Figures 1 to 5 The cylindrical membrane oxygenator of this application includes a shell assembly 10 and a liquid distribution column 20. The shell assembly 10 includes a first end cap assembly 11, a cylindrical body assembly 12 and a second end cap assembly 13 arranged sequentially along its axial direction C. The liquid distribution column 20 is disposed inside the cylindrical body assembly 12 and surrounds the liquid distribution chamber B1 with the cylindrical body assembly 12.

[0042] The first end cap assembly 11 has a liquid inlet channel A1, an air inlet chamber E1, an air inlet channel E3, and a water inlet chamber F1. The second end cap assembly 13 has an air outlet chamber E2 and a water outlet chamber F2. The cylinder assembly 12 has a liquid outlet channel A2, a heat exchange chamber B2, and an oxygenation chamber B3. The liquid outlet channel A2 is connected to the liquid distribution chamber B1. The heat exchange chamber B2 is connected to the liquid distribution chamber B1 and is internally encapsulated with heat exchange membrane filaments. The oxygenation chamber B3 is connected to the heat exchange chamber B2 and is internally encapsulated with oxygenation membrane filaments.

[0043] Specifically, the inlet channel A1 is used to allow blood to flow into the dispensing chamber B1, while the outlet channel A2 is used to allow blood to flow out of the membrane oxygenator; therefore, the dispensing chamber B1 can also be called the blood chamber. The inlet channel E3, the inlet chamber E1, and the outlet chamber E2 are used to allow gas (such as oxygen) to enter and exit the membrane oxygenator, while the water inlet chamber F1 and the water outlet chamber F2 are used to allow the heat exchange medium (such as constant temperature water) to enter and exit the membrane oxygenator.

[0044] The heat exchange membrane can be a hollow tubular structure. Constant temperature water flows through the inlet chamber F1 and passes through the interior of the heat exchange membrane. Blood enters the heat exchange chamber B2 through the inlet channel A1 and the distribution chamber B1 and flows through the outside of the heat exchange membrane (i.e., between adjacent heat exchange membranes) to carry out heat exchange between the constant temperature water and the blood.

[0045] The oxygenation membrane filament is also a hollow tubular structure. Oxygen flows through the air intake channel E3 and the air intake chamber E1 through the interior of the oxygenation membrane filament. Blood enters the oxygenation chamber B3 through the liquid separation chamber B1 and the heat exchange chamber B2 in sequence. The liquid in the blood flows through the outside of the oxygenation membrane filament (i.e., between adjacent oxygenation membrane filaments), while the gas in the blood flows through the inside of the oxygenation membrane filament to carry out gas exchange between oxygen and gas in the blood, thereby achieving the purpose of removing carbon dioxide from the blood.

[0046] The cylinder assembly 12 includes an inner cylinder 121, a middle cylinder 122, and an outer cylinder 123 arranged from the inside out. A heat exchange chamber B2 is formed between the inner cylinder 121 and the middle cylinder 122, and an oxygenation chamber B3 is formed between the middle cylinder 122 and the outer cylinder 123. The inner cylinder 121 includes a first cylinder section 1211, a plurality of liquid distribution fins 1212, and a second cylinder section 1213 arranged sequentially along the axial direction C.

[0047] The liquid distribution column 20 is spaced apart from the first cylinder portion 1211 at one end along the axial direction C, forming a liquid distribution chamber B1 with the first cylinder portion 1211, and connected to the second cylinder portion 1213 at the other end. The outer peripheral surface of the liquid distribution column 20 is connected to the first cylinder portion 1211 through at least part of the liquid distribution fins 1212, and a liquid distribution groove with a larger upper part and a smaller lower part is formed between two adjacent liquid distribution fins 1212, the liquid distribution column 20, and the heat exchange membrane filaments. An outlet channel A2 is formed at the end of the outer cylinder 123 away from the liquid inlet channel A1. The liquid inlet channel A1, which is located at the upper part in the axial direction, is connected to the outlet channel A2, which is located at the lower part, through the liquid distribution chamber B1 and the liquid distribution groove.

[0048] In the cylindrical membrane oxygenator of this application, the first end cap assembly 11 is located at one end of the cylinder assembly 12 (hereinafter referred to as the upper part of the membrane oxygenator) and forms an inlet channel A1. The outlet channel A2 (i.e. the bleeding port) is located at the end of the outer cylinder 123 away from the inlet channel A1 (hereinafter referred to as the lower part of the membrane oxygenator). In order to guide the blood in the upper inlet channel A1 into the lower outlet channel A2, this application sets a liquid distribution groove structure that is larger at the top and smaller at the bottom, so that the blood can be guided from the liquid distribution chamber B1 in the upper part of the oxygenator to the lower part of the oxygenator along the liquid distribution groove.

[0049] When the blood flow rate is high, a distribution channel structure with a larger upper section and a smaller lower section is used. This facilitates the blood's ascent along the axial direction C of the oxygenator, allowing the blood to flow relatively evenly through the heat exchange membrane filament gaps (i.e., heat exchange chamber B2) and oxygenation membrane filament gaps (i.e., oxygenation chamber B3) in the upper and lower sections. This prevents blood from flowing directly away from the lower part of the oxygenator, avoiding the "short circuit" phenomenon that would result in low membrane filament utilization. When the blood flow rate is low, a distribution channel structure with a larger upper section and a smaller lower section is used. Due to gravity, the blood is more easily guided from the upper part of the oxygenator to the lower part along the distribution channel and through the lower heat exchange membrane filament gaps and oxygenation membrane filament gaps. This results in lower utilization of the upper heat exchange membrane filaments and oxygenation membrane filaments, which can prevent excessive oxygenation and excessive carbon dioxide removal of the blood.

[0050] Therefore, based on the structural design of the liquid separator, the oxygenator of this application can utilize different membrane areas at different flow rates, ensuring both oxygenation efficiency at high flow rates and preventing excessive blood oxygenation and excessive carbon dioxide removal at lower flow rates.

[0051] In some embodiments, refer to Figures 3 to 5 and Figure 7 The cross-section of the liquid separating column 20 is arranged to increase sequentially from the direction close to the first cylinder 1211 toward the direction away from the first cylinder 1211, so that a liquid separating groove with a larger upper section and a smaller lower section is formed between the liquid separating column 20, the liquid separating fin 1212 and the heat exchange membrane filament.

[0052] The 20-section liquid separator adopts a structure design with a smaller upper section and a larger lower section, which is beneficial for guiding blood along the axial C direction to the lower end of the membrane oxygenator, thus making it more conducive to the uniform distribution of blood in the axial direction of the oxygenator.

[0053] In some embodiments, refer to 3 and Figure 7 The multiple liquid dispensing fins 1212 include a first liquid dispensing fin 1212A and a second liquid dispensing fin 1212B. The first liquid dispensing fin 1212A and the second liquid dispensing fin 1212B are spaced apart on the outer peripheral surface of the liquid dispensing column 20. The first liquid dispensing fin 1212A is connected to the first cylindrical body 1211, while the second liquid dispensing fin 1212B is not connected to the first cylindrical body 1211.

[0054] There can be one or more first liquid dispensing fins 1212A and second liquid dispensing fins 1212B. When there are multiple first liquid dispensing fins 1212A and multiple second liquid dispensing fins 1212B, the multiple first liquid dispensing fins 1212A and the multiple second liquid dispensing fins 1212B are arranged alternately in sequence.

[0055] In some embodiments, refer to Figure 4 At least a portion of the inlet channel A1 extends obliquely relative to the axial direction C, and the outlet channel A2 extends radially D along the housing assembly 10. The inlet of the inlet channel A1 and the outlet of the outlet channel A2 are located in the same plane. The inlet channel A1 includes a first inlet section A11 and a second inlet section A12 connected in sequence. The second inlet section A12 is located between the first inlet section A11 and the dispensing chamber B1. The extending direction of the second inlet section A12 is perpendicular to the extending direction of the outlet channel A2, and the angle between the extending direction of the first inlet section A11 and the extending direction of the outlet channel A2 is 30°-60°. For example, the angle between the extending direction of the first inlet section A11 and the extending direction of the outlet channel A2 can be 30°, 35°, 40°, 45°, 50°, 55°, etc.

[0056] It should be noted that "radial D" here and below refers to the radial direction consistent with the extension direction of the liquid outlet channel A2, which will not be repeated below.

[0057] In this embodiment, since the inlet of the inlet channel A1 and the outlet of the outlet channel A2 are located in the same plane, and the angle between the extension direction of the first inlet section A11 and the extension direction of the outlet channel A2 is 30°-60°, the blood has dynamic inertia when entering the membrane oxygenator. By adopting the above-mentioned inlet and outlet arrangement, the blood flow direction can be changed to the axial direction (i.e., the vertical direction), making it easier to push the blood to the area of ​​the membrane oxygenator opposite to the outlet of the outlet channel A2. This improves the uniformity of blood distribution inside the membrane oxygenator, thereby improving the gas exchange efficiency of the membrane oxygenator and preventing the formation of thrombi.

[0058] In some embodiments, refer to Figures 1 to 4 The housing assembly 10 also forms an exhaust channel A3, which is connected to the liquid inlet channel A1 and is located at the connection between the second liquid inlet section A12 and the first liquid inlet section A11.

[0059] In this embodiment, by setting an exhaust channel A3, air bubbles in the inlet channel A1 can be discharged in a timely manner during blood delivery.

[0060] In some embodiments, refer to Figure 2 The middle cylinder 122 is provided with multiple rows of through holes T1. All through holes T1 have the same width in the circumferential direction, and the height of the multiple rows of through holes T1 in the axial direction C decreases sequentially from the first cylinder part 1211 toward the second cylinder part 1213. That is, the cross-sectional area of ​​the multiple rows of through holes T1 in the axial direction C for blood flow decreases sequentially from top to bottom, which helps to improve the uniformity of blood distribution in the axial direction C inside the membrane oxygenator.

[0061] In some embodiments, refer to Figure 2 The through holes T1 in adjacent rows are staggered. This arrangement can improve the uniformity of blood flow in the circumferential direction of the middle cylinder 122.

[0062] In some embodiments, refer to Figure 4 and Figure 5 The diameter of the inner wall of the outer cylinder 123 near the liquid inlet channel A1 is smaller than the diameter of the inner wall away from the liquid inlet channel A1. At this time, the cross-sectional area of ​​the cavity between the outer cylinder 123 and the middle cylinder 122 is arranged to increase from top to bottom.

[0063] Since the liquid outlet channel A2 is located at the bottom of the oxygenator, the cross-sectional area of ​​the cavity between the outer cylinder 123 and the middle cylinder 122 is set with a smaller upper section and a larger lower section, which is equivalent to forming a gap liquid collection structure at the bottom of the oxygenator, so that blood can gather in this lower area, thereby facilitating the flow of blood out of the oxygenator through the liquid outlet channel A2 at the bottom of the outer cylinder 123.

[0064] In some embodiments, refer to Figure 4 and Figure 5 The gap between the inner wall of the outer cylinder 123 near the outlet channel A2 and the oxygenation membrane filament is larger than the gap between the inner wall of the other parts of the outer cylinder 123 and the oxygenation membrane filament. That is to say, in the axial direction C, the gap between the inner wall of the outer cylinder 123 near the outlet channel A2 and the oxygenation membrane filament is the largest, which can concentrate blood in this area, thereby facilitating the flow of blood out of the oxygenator through this area and the outlet channel A2.

[0065] Furthermore, the inner wall of the outer cylinder 123 near the liquid outlet channel A2 is formed with a concave circular or semi-circular surface, and the gap between the concave circular or semi-circular surface and the oxygenation membrane filament is larger than the gap between the inner wall of other parts of the outer cylinder 123 and the oxygenation membrane filament.

[0066] In some embodiments, refer to Figure 2 and Figure 6 The first end cap assembly 11 includes a first end cap housing 111 and a first channel member 112. The first end cap housing 111 includes an annular portion 1111, a first extension portion 1112 disposed on the inner edge of the annular portion 1111, and a second extension portion 1113 disposed on the outer edge of the annular portion 1111. An air inlet chamber E1 is formed between the first extension portion 1112 and the second extension portion 1113, and a water inlet chamber F1 is formed between the first channel member 112 and the first extension portion 1112. An exhaust channel A3 and a liquid inlet channel A1 are formed on the first channel member 112, and an air inlet channel E3 is formed on the second extension portion 1112. The extending direction of the air inlet channel E3 is tangential to the inner wall of the air inlet chamber E1.

[0067] Because the extension direction of the intake channel E3 is tangential to the inner wall of the intake chamber E1, the gas enters the intake chamber E1 through the intake channel E3 and forms a swirling flow, thereby accelerating the flow speed of the gas in the intake chamber E1. This allows the gas to flow from the side closer to the intake channel E3 to a more distant area, thus increasing the gas flow rate in the oxygenation membrane filaments on the side farther from the intake channel E3. This, in turn, improves the gas exchange utilization rate in the oxygenation membrane filaments and the efficiency of carbon dioxide removal from the blood.

[0068] In some embodiments, refer to Figures 2 to 5The second end cap assembly 13 is provided with an exhaust channel E4 that communicates with the exhaust chamber E2, through which gas flows out of the exhaust chamber E2. The exhaust channel E4 extends tangentially to the inner wall of the exhaust chamber E2, and the exhaust direction of the exhaust channel E4 is opposite to the intake direction of the intake channel E3.

[0069] Since the extension direction of the outlet channel E4 is tangential to the inner wall of the outlet chamber E2, and the outlet direction of the outlet channel E4 is opposite to the inlet direction of the inlet channel E3, the oxygenator of this application can increase the resistance of gas flowing directly out of the oxygenation membrane filament from the side near the inlet channel E3 and reduce the resistance of gas flowing directly out of the oxygenation membrane filament from the side away from the inlet channel E3, thereby facilitating the uniform flow of gas inside the oxygenator.

[0070] In some embodiments, refer to 1, Figure 2 and Figure 5 The first end cap housing 111 also forms a water inlet channel F3 communicating with the water inlet chamber F1. The air outlet channel E4 and the air inlet channel E3 are located on both sides of the water inlet channel F3 in the radial direction D of the housing assembly 10. This arrangement can increase the resistance of gas flowing directly out of the oxygenation membrane filament from the side near the air inlet channel E3 at the oxygenator end where the air outlet channel E4 is located, and reduce the resistance of gas flowing directly out of the oxygenation membrane filament from the side away from the air inlet channel E3, thereby facilitating the uniform flow of gas inside the oxygenator.

[0071] In some embodiments, refer to 1, Figure 2 and Figure 5 The second end cap assembly 13 is also provided with a water outlet channel F4 communicating with the water outlet chamber F2. Constant temperature water flows out of the water outlet chamber F2 through the water outlet channel F4. The air outlet channel E4 and the air inlet channel E3 are located on both sides of the water outlet channel F4 in the radial direction D of the housing assembly 10. This arrangement can increase the resistance of gas flowing directly out of the oxygenation membrane filament from the side near the air inlet channel E3 at the oxygenator end where the air outlet channel E4 is located, and reduce the resistance of gas flowing directly out of the oxygenation membrane filament from the side away from the air inlet channel E3, thereby facilitating the uniform flow of gas inside the oxygenator.

[0072] Reference Figure 3 The second end cap assembly 13 includes a second end cap housing 131 and a second channel member 132. The structure of the second end cap housing 131 can be similar to that of the first end cap housing 111, and the structure of the second channel member 132 can be similar to that of the first channel member 112. These details will not be elaborated here.

[0073] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A cylindrical membrane oxygenator, characterized by, The shell assembly (10) comprises a first end cover assembly (11), a cylinder assembly (12) and a second end cover assembly (13) arranged in sequence along an axial direction (C) thereof; The cylinder assembly (12) comprises an inner cylinder (121), a middle cylinder (122) and an outer cylinder (123) arranged from inside to outside, a heat exchange cavity (B2) is formed between the inner cylinder (121) and the middle cylinder (122), an oxygenation cavity (B3) is formed between the middle cylinder (122) and the outer cylinder (123), the heat exchange cavity (B2) is internally encapsulated with heat exchange membrane filaments, and the oxygenation cavity (B3) is internally encapsulated with oxygenation membrane filaments; The inner cylinder (121) comprises a first cylinder part (1211), a plurality of liquid distribution fins (1212) and a second cylinder part (1213) arranged in sequence along the axial direction (C); The liquid distribution column (20) is arranged at one end of the axial direction (C) and spaced from the first cylinder part (1211), and the first cylinder part (1211) and the second cylinder part (1213) are connected at the other end, the outer peripheral surface of the liquid distribution column (20) is connected with the first cylinder part (1211) through the liquid distribution fins (1212), and adjacent two liquid distribution fins (1212) and the liquid distribution column (20) and the heat exchange membrane filaments form a liquid distribution groove which is large at the top and small at the bottom; The first end cover assembly (11) forms a liquid inlet passage (A1), and the outer cylinder (123) forms a liquid outlet passage (A2) at the end away from the liquid inlet passage (A1), and the liquid inlet passage (A1) is communicated with the liquid distribution cavity (B1), the liquid distribution groove and the liquid outlet passage (A2).

2. The cylindrical membrane oxygenator of claim 1, wherein, The cross section of the liquid distribution column (20) is arranged in sequence from the first cylinder part (1211) to the second cylinder part (1213) in the direction, to form a liquid distribution groove which is large at the top and small at the bottom with the liquid distribution fins (1212) and the heat exchange membrane filaments.

3. The cylindrical membrane oxygenator according to claim 1, wherein The plurality of liquid distribution fins (1212) comprises first liquid distribution fins (1212A) and second liquid distribution fins (1212B), and the first liquid distribution fins (1212A) and the second liquid distribution fins (1212B) are arranged at intervals on the outer peripheral surface of the liquid distribution column (20); The first liquid distribution fins (1212A) are connected with the first cylinder part (1211), and the second liquid distribution fins (1212B) are not connected with the first cylinder part (1211).

4. The cylindrical membrane oxygenator according to claim 1, wherein At least part of the liquid inlet passage (A1) is arranged to extend obliquely relative to the axial direction (C), the liquid outlet passage (A2) extends in the radial direction (D) of the shell assembly (10), and the liquid inlet of the liquid inlet passage (A1) and the liquid outlet of the liquid outlet passage (A2) are located in the same plane. The liquid inlet channel (A1) comprises a first liquid inlet section (A11) and a second liquid inlet section (A12) connected in sequence, and the second liquid inlet section (A12) is located between the first liquid inlet section (A11) and the liquid distribution cavity (B1); The extension direction of the second liquid inlet section (A12) is perpendicular to the extension direction of the liquid outlet channel (A2), and the included angle between the extension direction of the first liquid inlet section (A11) and the extension direction of the liquid outlet channel (A2) is 30-60°.

5. The cylindrical membrane oxygenator of claim 1, wherein, The middle cylinder (122) is provided with multiple rows of through holes (T1); The heights of the multiple rows of through holes (T1) in the axial direction (C) are arranged in sequence to decrease from the first cylinder body part (1211) to the second cylinder body part (1213); and / or The through holes (T1) in adjacent two rows are arranged in a staggered manner.

6. The cylindrical membrane oxygenator of claim 1, wherein, The diameter of the inner wall of the outer cylinder (123) near one end of the liquid inlet channel (A1) is smaller than the diameter of the inner wall of the outer cylinder (123) away from one end of the liquid inlet channel (A1).

7. The cylindrical membrane oxygenator of claim 1, wherein, The gap between the inner wall of the outer cylinder (123) near the liquid outlet channel (A2) and the oxygenation membrane wire is larger than the gap between the inner wall of other parts of the outer cylinder (123) and the oxygenation membrane wire.

8. The cylindrical membrane oxygenator of any one of claims 1-7, wherein, The first end cover assembly (11) comprises a first end cover shell (111) and a first channel piece (112), the first end cover shell (111) is formed with an air inlet cavity (E1) and an air inlet channel (E3) connected to each other, and the extension direction of the air inlet channel (E3) is tangential to the inner wall of the air inlet cavity (E1); The first channel piece (112) is formed with the liquid inlet channel (A1), and the first channel piece (112) and the first end cover shell (111) form a water inlet cavity (F1); The second end cover assembly (13) is formed with an air outlet cavity (E2) communicating with the air inlet cavity (E1) and a water outlet cavity (F2) communicating with the water inlet cavity (F1).

9. The cylindrical membrane oxygenator according to claim 8, wherein The second end cover assembly (13) is further formed with an air outlet channel (E4) communicating with the air outlet cavity (E2); The extension direction of the air outlet channel (E4) is tangential to the inner wall of the air outlet cavity (E2), and the air outlet direction of the air outlet channel (E4) is opposite to the air inlet direction of the air inlet channel (E3).

10. The cylindrical membrane oxygenator according to claim 9, wherein The first end cover shell (111) is further formed with a water inlet channel (F3) communicating with the water inlet cavity (F1), and the air outlet channel (E4) and the air inlet channel (E3) are located on both sides of the water inlet channel (F3) in the radial direction (D) of the shell assembly (10); and / or The second end cover assembly (13) is further formed with a water outlet channel (F4) communicating with the water outlet cavity (F2), and the air outlet channel (E4) and the air inlet channel (E3) are located on both sides of the water outlet channel (F4) in the radial direction (D) of the shell assembly (10).

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