Inclined flow channel-based oxygenator having feed liquid dispersion structure

Abstract

An inclined flow channel-based oxygenator having a feed liquid dispersion structure, the oxygenator comprising a shell (101) and an oxygenation variable-temperature module, wherein a water inlet (104), a water outlet (105), a blood inlet (106) and an air outlet (107) are provided at the bottom of the shell (101), and an air inlet (108), an exhaust port (109) and a blood outlet nozzle (110) are provided at an upper portion of the shell (101); the oxygenation variable-temperature module is vertically provided in the shell (101) and sequentially comprises a mandrel (201), a variable-temperature membrane (202) and an oxygen pressure membrane (203) from inside to outside, a lower end of the mandrel (201) directly faces the blood inlet (106), the variable-temperature membrane (202) is in communication with the water inlet (104) and the water outlet (105), and the oxygen pressure membrane (203) is in communication with the air inlet (108) and the air outlet (107); and the oxygenation variable-temperature module further comprises a feed liquid dispersion structure, which comprises a plurality of flow dividing steps (204) provided on an outer wall of the mandrel (201), each flow dividing step (204) surrounds the outer wall of the mandrel (201) for a circle, the plurality of flow dividing steps (204) are distributed at intervals along a long axis of the mandrel (201), and the diameter of the flow dividing step (204) close to the lower end of the mandrel (201) is less than that of the flow dividing step (204) close to an upper end of the mandrel (201). The device can shorten pre-charging time of the oxygenator and reduce pressure loss.

Description

Oblique flow channel oxygenator with liquid inlet dispersion structure Technical Field

[0001] The present invention relates to the technical field of medical devices, in particular to an oblique flow channel oxygenator with a liquid inlet dispersion structure. Background Art

[0002] Extracorporeal circulation devices used in clinical surgery, commonly known as artificial lungs or oxygenators, play a vital role in extracorporeal circulation (CPB) and extracorporeal membrane oxygenation (ECMO). Their primary function is to convert oxygen-depleted venous blood into oxygen-rich arterial blood, replacing lung function and meeting the needs of patients during surgery.

[0003] Currently, the ECMO oxygenators (hereinafter referred to as long-acting oxygenators) on the market all share the same design with the CPB oxygenators (hereinafter referred to as short-acting oxygenators) of the same brand, ignoring the different focuses of long-acting oxygenators in actual use. The main manifestations are: (1) Short-acting oxygenators have sufficient preparation time, so the requirements for rapid priming and exhaust are not high. The focus is on oxygen supply after cardiac arrest, so they are more concerned about gas exchange efficiency; long-acting oxygenators are mostly used in emergency critical care scenarios, such as fulminant myocarditis, drowning, myocardial infarction, etc., which require medical staff to quickly establish ECMO circulation pathways within the golden rescue window, so they are more sensitive to the priming time of the product. (2) Short-acting oxygenators use roller pumps most of the time, so they are not sensitive to the pressure loss of the oxygenator itself; long-acting oxygenators all use centrifugal pumps to drive blood. Based on the characteristics of centrifugal pumps, they are more sensitive to the pressure loss of the oxygenator itself. The pressure loss of an oxygenator determines the maximum pump output capacity and the speed difference at the same flow rate. A greater pressure loss in the oxygenator requires a higher speed to maintain flow, exacerbating blood damage. Given this, it is necessary to design an oxygenator with a short priming time and minimal pressure loss to meet the functional requirements of critical care emergency scenarios.

[0004] Summary of the Invention

[0005] The technical problem to be solved by the embodiments of the present invention is to provide an oxygenator with an oblique flow channel and a liquid inlet dispersion structure, which can shorten the oxygenator priming time and reduce pressure loss.

[0006] In order to solve the above technical problems, the present invention provides an oblique flow channel oxygenator with a liquid inlet dispersion structure, comprising:

[0007] The shell has a water inlet, a water outlet, a blood inlet and an air outlet at the bottom, and an air inlet, an air outlet and a blood outlet at the top;

[0008] an oxygenation temperature-variable module, vertically disposed in the housing, comprising, from the inside out, a core shaft, a temperature-variable membrane, and an oxygen pressure membrane, wherein the lower end of the core shaft faces the blood inlet, the temperature-variable membrane communicates with the water inlet and the water outlet, and the oxygen pressure membrane communicates with the air inlet and the air outlet;

[0009] The oxygenation temperature-variable module also includes a liquid inlet dispersion structure, which includes a plurality of diverter steps arranged on the outer wall of the core shaft, each of the diverter steps surrounding the outer wall of the core shaft, and the plurality of diverter steps are spaced apart along the long axis of the core shaft, and the diameter of the diverter step near the lower end of the core shaft is smaller than the diameter of the diverter step near the upper end of the core shaft.

[0010] Optionally, the liquid inlet dispersion structure also includes a drainage piece and a connecting rib, the drainage piece is connected to the core shaft through the connecting rib, a first cache space is provided between the lower end surface of the core shaft and the drainage piece, a second cache space is provided between the diversion step and the drainage piece, the second cache space is connected to the first cache space, a drainage hole is provided on the drainage piece, and the drainage hole connects the blood inlet and the first cache space.

[0011] Optionally, the lower end surface of the core shaft faces the drainage hole, and the blood entering the first cache space is blocked by the lower end surface of the core shaft and dispersed to the surroundings of the first cache space.

[0012] Optionally, a plurality of connecting ribs are evenly spaced on the outer wall of the core shaft, and the plurality of connecting ribs divide the second buffer space into a plurality of subspaces;

[0013] The temperature-variable membrane wraps the connecting rib, and the oxygen pressure membrane wraps the temperature-variable membrane. The blood flowing out of the first buffer space rises along the subspace and obliquely passes through the temperature-variable membrane and the oxygen pressure membrane under the blocking effect of the diversion step.

[0014] Optionally, the step surface of the diversion step is inclined from the lower end surface of the core shaft to the upper end surface of the core shaft.

[0015] Optionally, an angle of 45°-90° is formed between the step surface and the long axis of the core shaft.

[0016] Optionally, the bleeding nozzle is lower than the effective contact height of the oxygen pressure membrane, and the bleeding nozzle is inclined from the top of the shell to the bottom of the shell.

[0017] Optionally, the exhaust port is communicated with the oxygen pressure membrane and is higher than an effective contact height of the oxygen pressure membrane.

[0018] Optionally, the ratio of the outer diameter of the oxygen pressure membrane to the effective contact height of the oxygen pressure membrane is 1:1 to 2:1.

[0019] The implementation of the present invention has the following beneficial effects:

[0020] This disclosure designs the blood flow path and core shaft structure of the oxygenator, allowing blood to enter the oxygenation temperature-variable module through the blood inlet at the bottom of the housing. Within the module, the liquid inlet dispersion structure disperses and drains the blood, causing it to obliquely pass through the temperature-variable membrane and oxygen pressure membrane before exiting through the blood outlet at the top of the housing. This design utilizes a bottom-up blood inlet method, aligning the blood flow direction with the bubble flow, facilitating the upward and expulsion of bubbles. In addition, by arranging multiple diversion steps on the outer wall of the core shaft, after the blood enters the oxygenation temperature-variable module from the blood inlet, the temperature-variable membrane and oxygen pressure membrane that are blocked by the diversion steps to the outside are evenly dispersed during the process of blood level rising, so that the temperature-variable membrane and oxygen pressure membrane at the lower part of the oxygenation temperature-variable module are quickly filled with blood. When the blood fills the lower part of the oxygenation temperature-variable module, it will drive the gas at the lower part of the oxygenation temperature-variable module upward, thereby accelerating the exhaust and shortening the pre-filling time of the oxygenator. Furthermore, since the diversion steps divert the blood, the blood level rising speed and blood flow rate are reduced, and the situation of air being entrained in the blood during flow is reduced, that is, the generation of bubbles in the blood is reduced. The slow rise of the blood level can also further promote the smooth discharge of air in the oxygen pressure membrane group. Moreover, the diversion steps make the blood evenly diffuse to the surroundings, change the blood flow direction so that the blood can obliquely pass through the temperature-variable membrane and oxygen pressure membrane, resulting in small pressure loss and little damage to the blood. During the oblique penetration process, the blood flow and gas flow directions are at an angle of 45° to 90°, which is conducive to maintaining the concentration difference between the blood phase side and the gas phase side, and can effectively increase the gas exchange rate and improve the oxygen exchange rate of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] FIG1 is a schematic structural diagram of an oxygenator provided in an embodiment of the present invention;

[0022] FIG2 is a side view of an oxygenator provided in an embodiment of the present invention;

[0023] FIG3 is a front view of an oxygenator provided in an embodiment of the present invention;

[0024] FIG4 is a cross-sectional view of an oxygenator provided in an embodiment of the present invention;

[0025] 5 is a schematic diagram of the overall structure of the core shaft and liquid dispersion structure of the oxygenator provided in an embodiment of the present invention;

[0026] FIG6 is a schematic diagram of the overall structure of the core shaft and liquid dispersion structure of the oxygenator provided in an embodiment of the present invention;

[0027] FIG7 is a schematic diagram of the flow of blood, gas, and heating medium in the oxygenator provided by an embodiment of the present invention.

[0028] In the figure: 101 shell, 102 upper cover, 103 lower cover, 104 water inlet, 105 water outlet, 106 blood inlet, 107 air outlet, 108 air inlet, 109 exhaust port, 110 bleeding nozzle, 111 shell, 201 core shaft, 202 temperature variable membrane, 203 oxygen pressure membrane, 204 diversion step, 205 drainage member, 206 drainage hole, 207 connecting rib, 208 first cache space, 209 second cache space, 210 subspace, 211 step surface, 301 first blocking layer, 302 second blocking layer, 401 gap. DETAILED DESCRIPTION

[0029] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0030] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly attached to the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0032] This embodiment provides an oblique flow channel oxygenator with a dispersed liquid inlet structure, comprising a housing 101 and an oxygenation temperature-variable module. Referring to Figures 1-4 , the bottom of the housing 101 is provided with a water inlet 104, a water outlet 105, a blood inlet 106, and an air outlet 107, while the upper portion is provided with an air inlet 108, an air outlet 109, and a blood outlet 110. The oxygenation temperature-variable module is vertically disposed within the housing 101 and comprises, from the inside out, a core shaft 201, a temperature-variable membrane 202, and an oxygen pressure membrane 203. The lower end of the core shaft 201 faces the blood inlet 106, the temperature-variable membrane 202 connects the water inlet 104 and the water outlet 105, and the oxygen pressure membrane 203 connects the air inlet 108 and the air outlet 107. Referring to Figures 5 and 6 , the oxygenation temperature-variable module also includes a liquid inlet dispersion structure, which includes a plurality of diverter steps 204 disposed on the outer wall of the core shaft 201. Each diverter step 204 encircles the outer wall of the core shaft 201. The plurality of diverter steps 204 are spaced apart along the long axis of the core shaft 201, and the diameter of the diverter step 204 near the lower end of the core shaft 201 is smaller than the diameter of the diverter step 204 near the upper end of the core shaft 201. All diverter steps 204 are coaxial with the core shaft 201 and are annular in shape. The width of each region on a single diverter step 204 is the same, and the widths of the diverter steps 204 can be the same or different. The width of the diverter step 204 refers to the height by which the diverter step 204 protrudes from the outer wall of the core shaft 201.

[0033] In one possible implementation, the housing 101 includes a shell 111, an upper cover 102 provided at the top opening of the shell 111, and a lower cover 103 provided at the bottom opening of the shell 111, the air inlet 108 is provided on the upper cover 102, the exhaust port 109 and the bleeding nozzle 110 are provided on the shell 111 near the upper cover 102, and the water inlet 104, the water outlet 105, the blood inlet 106 and the air outlet 107 are provided on the lower cover 103. The oxygenation temperature-variable module is arranged in the shell. A first blocking layer 301 is provided between the upper end of the oxygenation temperature-variable module and the upper cover 102. A second blocking layer 302 is provided between the lower end of the oxygenator module and the lower cover 103. The core shaft 201 is vertically arranged in the middle of the shell. The upper end of the core shaft 201 is fixed to the first blocking layer 301. The drainage piece 205 is connected to the blood inlet 106. The temperature-variable membrane 202 passes through the second blocking layer 302 to communicate with the water inlet 104 and the water outlet 105. The blood inlet 106 passes through the second blocking layer 302 to communicate with the drainage hole 206. The inlet of the oxygen pressure membrane 203 passes through the first blocking layer 301 to communicate with the air inlet 108, and the outlet of the oxygen pressure membrane 203 passes through the second blocking layer 302 to communicate with the air outlet 107.

[0034] Figure 7 illustrates the flow of blood, heating medium, and oxygen within the oxygenator. Red represents blood, blue represents heating medium, and green represents oxygen. Oxygen enters the oxygen pressure membrane filaments filling the oxygen pressure membrane 203 from the air inlet 108. Oxygen within the oxygen pressure membrane 203 exchanges with carbon dioxide in the blood, and then is carried out of the oxygen pressure membrane 203 and discharged through the air outlet 107. A heating medium, such as water, enters the temperature-variable membrane filaments filling the temperature-variable membrane 202 from the water inlet 104. As blood flows through the temperature-variable membrane 202, heat exchange occurs, raising the blood temperature. The heating medium within the temperature-variable membrane 202 can be discharged from the water outlet 105 and, after being externally heated, reenters the temperature-variable membrane 202. Blood enters the space between the core shaft 201 and the temperature-variable membrane 202 from the blood inlet 106. The blood is dispersed in all directions by the drainage function of the liquid inlet dispersion structure, obliquely passing through the temperature-variable membrane 202 and the oxygen pressure membrane 203, before exiting through the blood outlet 110.

[0035] The present disclosure designs the blood flow path and core shaft 201 structure of the oxygenator, allowing blood to enter the oxygenation temperature-variable module through the blood inlet 106 at the bottom of the housing 101. Within the oxygenation temperature-variable module, the liquid inlet dispersion structure disperses and drains the blood, causing it to obliquely pass through the temperature-variable membrane 202 and the oxygen pressure membrane 203 before exiting through the blood outlet 110 at the top of the housing 101. The design of the liquid inlet dispersion structure reduces blood pressure loss and shortens the oxygenator priming time. This is primarily reflected in the following aspects:

[0036] 1. The blood is introduced from the bottom, so that the blood flow direction is consistent with the bubble direction, which is conducive to the upward discharge of bubbles;

[0037] 2. By providing a plurality of diverter steps 204 on the outer wall of the core shaft 201, after the blood enters the oxygenation temperature-variable module from the blood inlet 106, the blood level rises and is evenly dispersed by the diverter steps 204 toward the external temperature-variable membrane 202 and oxygen pressure membrane 203, so that the temperature-variable membrane 202 and oxygen pressure membrane 203 at the bottom of the oxygenation temperature-variable module are quickly filled with blood, forcing the gas at the bottom of the oxygenation temperature-variable module upward, thereby accelerating exhaust and shortening the oxygenator priming time.

[0038] 3. The diversion step 204 evenly disperses the blood to the surrounding areas, expanding the contact area between the blood and the temperature-variable membrane 202 and the oxygen pressure membrane 203 at the initial stage of blood injection, thereby improving the oxygenation efficiency;

[0039] 4. Since the diversion step 204 diverts the blood, the blood level rise speed is reduced, and the air entrained in the blood flow is reduced, that is, the generation of bubbles in the blood is reduced. The slow rise of the blood level also further promotes the smooth discharge of air in the oxygen pressure membrane 203 group from the exhaust port 109;

[0040] 5. The blood is evenly diffused around by the diversion step 204, and the blood flow direction is changed so that the blood can obliquely pass through the temperature-variable membrane 202 and the oxygen pressure membrane 203. The blood has good permeability, small pressure loss, and little damage to the blood.

[0041] Please refer to Figures 5 and 6. The liquid inlet dispersion structure also includes a drainage piece 205 and a connecting rib 207. The drainage piece 205 is connected to the core shaft 201 through the connecting rib 207. There is a first cache space 208 between the lower end surface of the core shaft 201 and the drainage piece 205. There is a second cache space 209 between the diversion step 204 and the drainage piece 205. The second cache space 209 is connected to the first cache space 208. A drainage hole 206 is provided on the drainage piece 205, and the drainage hole 206 connects the blood inlet 106 and the first cache space 208. After blood enters through the blood inlet 106, it initially resides in the first buffer space 208. During this process, the blood diffuses into the lower portion of the temperature-variable membrane 202 and the oxygen pressure membrane 203, forcing the air in the lower portion of the housing upward. With the continued infusion of blood, the blood overflows the first buffer space 208 and rises to the second buffer space 209. The blood continues to flow upward within the second buffer space 209, but is blocked by the diversion step 204. The blood diffuses into the middle portion of the temperature-variable membrane 202 and the oxygen pressure membrane 203, forcing the air in the housing upward, thereby rapidly discharging the gas from the oxygenator and shortening the priming time. Furthermore, blood enters the oxygenator through the blood inlet 106 at the bottom, obliquely passes through the temperature-variable membrane 202 and the oxygen pressure membrane 203, and then exits through the blood port at the top of the oxygenator. This blood flow aligns with the gas flow, conforming to the physical properties of bubbles in liquids and facilitating the natural and rapid discharge of gas, eliminating the need for the user to tap the housing 101 to induce gas discharge. Experiments have shown that the connected oxygenator of this embodiment can complete exhaust within 15 seconds, while the exhaust action of a conventional oxygenator takes 1 to 5 minutes (depending on the operator's proficiency). It can be seen that the oxygenator of this embodiment greatly shortens the priming time and reduces the product's requirements for operators.

[0042] In one possible implementation, the lower end face of the core shaft 201 faces the drainage hole 206. Blood entering the first buffer space 208 is blocked by the lower end face of the core shaft 201 and dispersed around the first buffer space 208. With the lower end face of the core shaft 201 facing the drainage hole 206, blood directly impacts the lower end face of the core shaft 201 after exiting the drainage hole 206. The blood is then constrained by the lower end face of the core shaft 201 and dispersed around the lower end face. This facilitates uniform blood diffusion in the lower portion of the oxygenator, quickly displacing air from the lower portion of the oxygenator, and improving the utilization rate of the temperature-variable membrane 202 and oxygen pressure membrane 203 during the initial phase of blood injection.

[0043] In one possible implementation, the outer wall of the core shaft 201 is evenly spaced with a plurality of connecting ribs 207, and the plurality of connecting ribs 207 divide the second buffer space 209 into a plurality of subspaces 210 of uniform size. The temperature-variable membrane 202 wraps the connecting ribs 207, and the oxygen pressure membrane 203 wraps the temperature-variable membrane 202. The blood flowing out of the first buffer space 208 flows evenly into each subspace 210 and slowly rises in the subspace 210. During the rising process, it is blocked by the diverter step 204 and diffuses to the surroundings, and then obliquely passes through the temperature-variable membrane 202 and the oxygen pressure membrane 203. The step surface 211 of the diverter step 204 is inclined from the lower end surface of the core shaft 201 to the upper end surface of the core shaft 201. Specifically, the step surface 211 forms an angle of 45°-90° with the long axis of the core shaft 201.

[0044] The temperature-variable membrane 202 includes a plurality of temperature-variable membrane filaments distributed along the long axis of the core shaft 201, with flow gaps formed between adjacent temperature-variable membrane filaments, and the plurality of flow gaps form a louver shape in the radial direction of the oxygenator; the oxygen pressure membrane 203 wraps the temperature-variable membrane 202, and includes a plurality of oxygen pressure membrane filaments distributed along the long axis of the core shaft 201 and staggered with each other, with flow holes formed between adjacent oxygen pressure membrane filaments, and the plurality of flow holes form a honeycomb shape in the radial direction of the oxygenator.

[0045] Since the angle between the step surface 211 and the long axis of the core shaft 201 is 45°-90°, when the blood encounters the step surface 211, it switches from a vertical upward flow direction to an oblique upward flow direction, thereby passing through the flow gap obliquely upward. The flow direction of the blood when it obliquely passes through the oxygen pressure membrane is similar to a step shape, and can be decomposed into two states: passing through the flow hole horizontally and flowing along the membrane filaments of the oxygen pressure membrane. Specifically, since the flow gap is a long strip-shaped channel and the flow hole is a hole-shaped channel, after the blood passes through the flow gap, it is blocked by the membrane filaments of the oxygen pressure membrane and switches from an oblique upward flow direction to a horizontal flow direction, passing through the flow hole close to the temperature-variable membrane. Then, driven by the continuous injection of blood, the blood will flow upward along the membrane filaments of the oxygen pressure membrane, passing through the flow hole close to the inner wall of the shell until it reaches the upper part of the bleeding nozzle and flows out of the bleeding nozzle. Here, "transverse" means that the blood passes through the flow hole in a manner perpendicular to the flow hole, that is, the blood flows in the radial direction of the oxygenator. In this state, the blood encounters less resistance, flows faster, and is less damaged.

[0046] In this embodiment, blood enters the vicinity of the core shaft and is dispersed in all directions under the constraints of the lower end face of the core shaft, the diversion step, and the connecting ribs. This is the first diversion. Then, the flow gap disperses the blood into smaller streams. This is the second diversion. After two diversions, the blood is evenly dispersed. On the one hand, it is beneficial to squeeze out the air in the shell. On the other hand, it can make the blood more fully contact with the oxygen pressure membrane filaments, improve the oxygenation effect, and increase the utilization rate of the oxygen pressure membrane in the initial stage of blood injection. In the variable temperature membrane, the flow gap has a large flow area. The blood passes through the variable temperature membrane at a fast speed and with little obstruction, and can quickly pass through the variable temperature membrane to reach the oxygen pressure membrane. In the oxygen pressure membrane, blood passes horizontally through the flow hole, which has the advantages of low flow resistance and low pressure loss. The blood flows along the oxygen pressure membrane filaments, which increases the contact area between the blood and the oxygen pressure membrane, enhancing the oxygenation effect. It can be seen that this embodiment combines the performance of low flow resistance in transverse flow and enhanced oxygenation in the downstream direction.

[0047] In this embodiment, the diagonal design is based on the maximum flow rate. The ratio of the outer diameter of the oxygen pressure membrane 203 to the effective contact height of the oxygen pressure membrane 203 can be 1:1 to 2:1. The effective contact height of the oxygen pressure membrane 203 refers to the height of the portion of the oxygen pressure membrane 203 within the housing that can convert oxygen-depleted blood into oxygen-rich blood, and does not exceed the exhaust port 109. The effective contact height of the oxygen pressure membrane 203 can specifically be the distance between the top surface of the second sealing layer 302 and the lower end surface of the exhaust port 109.

[0048] As shown in Figure 4 , the exhaust port 109 is connected to the oxygen pressure membrane 203 and is located above the effective contact height of the oxygen pressure membrane 203. Bubbles that rise to the surface of the blood can be discharged through the exhaust port 109, but blood will not flow out of the exhaust port 109. A bleeding nozzle 110 is connected to the oxygen pressure membrane 203. The inlet of the bleeding nozzle 110 is located below the effective contact height of the oxygen pressure membrane 203 and is inclined from the top to the bottom of the housing 101. As shown in Figure 7 , a gap is formed between the oxygen pressure membrane 203 and the inner wall of the housing. The width of the gap increases from the bottom to the top of the housing. The inlet of the bleeding nozzle 110 is connected to the upper portion of the gap. After passing through the oxygen pressure membrane 203, the blood gathers in the gap and then flows out from the bleeding nozzle 110. The flow direction of the blood from the gap to the bleeding nozzle 110 is close to vertically downward. Since the bleeding nozzle 110 is tilted downward, the blood turning angle is small and the flow rate changes little, which can reduce blood pressure loss and blood damage. The smooth bend design further reduces blood pressure loss.

[0049] CFD simulations of blood flow through the oxygenator of this embodiment revealed that the majority of blood flow crosses the oxygen pressure membrane filament, reducing pressure loss within the oxygenator. The lower the pressure loss, the lower the centrifugal pump speed at the same flow rate, resulting in less blood damage. Field measurements showed that the pressure loss of the oxygenator of this embodiment at maximum flow rate was ≤70 mmHg, lower than the pressure loss of all currently known oxygenators. Furthermore, the unique downwardly curved design of the blood outlet 110 of this embodiment effectively reduces pressure loss and blood damage, avoiding the damage associated with traditional horizontal outlets.

[0050] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned 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.

[0051] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. An oblique flow channel oxygenator with a liquid inlet dispersion structure, characterized in that: include: A housing (101), wherein the bottom of the housing (101) is provided with a water inlet (104), a water outlet (105), a blood inlet (106) and an air outlet (107), and the upper portion is provided with an air inlet (108), an air outlet (109) and a blood outlet (110); An oxygenation temperature-variable module is vertically arranged in the housing (101), and the oxygenation temperature-variable module comprises, from the inside to the outside, a core shaft (201), a temperature-variable membrane (202), and an oxygen pressure membrane (203), wherein the lower end of the core shaft (201) faces the blood inlet (106), the temperature-variable membrane (202) is connected to the water inlet (104) and the water outlet (105), and the oxygen pressure membrane (203) is connected to the air inlet (108) and the air outlet (107); The oxygenation temperature-variable module also includes a liquid inlet dispersion structure, which includes a plurality of diverter steps (204) arranged on the outer wall of the core shaft (201), each of the diverter steps (204) surrounds the outer wall of the core shaft (201), and the plurality of diverter steps (204) are spaced apart along the long axis of the core shaft (201), and the diameter of the diverter step (204) close to the lower end of the core shaft (201) is smaller than the diameter of the diverter step (204) close to the upper end of the core shaft (201).

2. The oxygenator according to claim 1, characterized in that The liquid inlet dispersion structure also includes a drainage piece (205) and a connecting rib (207), wherein the drainage piece (205) is connected to the core shaft (201) via the connecting rib (207), a first buffer space (208) is provided between the lower end surface of the core shaft (201) and the drainage piece (205), a second buffer space (209) is provided between the diversion step (204) and the drainage piece (205), the second buffer space (209) is connected to the first buffer space (208), and a drainage hole (206) is provided on the drainage piece (205), and the drainage hole (206) is connected to the blood inlet (106) and the first buffer space (208).

3. The oxygenator according to claim 2, characterized in that The lower end surface of the core shaft (201) faces the drainage hole (206), and the blood entering the first buffer space (208) is blocked by the lower end surface of the core shaft (201) and dispersed around the first buffer space (208).

4. The oxygenator according to claim 2, characterized in that The outer wall of the core shaft (201) is evenly spaced with a plurality of connecting ribs (207), and the plurality of connecting ribs (207) divide the second buffer space (209) into a plurality of subspaces (210); The variable temperature membrane (202) wraps the connecting rib (207), and the oxygen pressure membrane (203) wraps the variable temperature membrane (202). The blood flowing out of the first buffer space (208) rises along the subspace (210) and obliquely passes through the variable temperature membrane (202) and the oxygen pressure membrane (203) under the blocking effect of the diversion step (204).

5. The oxygenator according to claim 4, characterized in that The step surface (211) of the flow-dividing step (204) is inclined from the lower end surface of the core shaft (201) toward the upper end surface of the core shaft (201).

6. The oxygenator according to claim 5, characterized in that An included angle of 45°-90° is formed between the step surface (211) and the long axis of the core shaft (201).

7. The oxygenator according to claim 1, characterized in that The bleeding nozzle (110) is lower than the effective contact height of the oxygen pressure membrane (203), and the bleeding nozzle (110) is inclined from the top of the shell (101) to the bottom of the shell (101).

8. The oxygenator according to claim 7, characterized in that The bleeding nozzle (110) is a curved pipe; The exhaust port (109) is in communication with the oxygen pressure membrane (203) and is higher than the effective contact height of the oxygen pressure membrane (203).

9. The oxygenator according to claim 5, characterized in that The ratio of the outer diameter of the oxygen pressure membrane (203) to the effective contact height of the oxygen pressure membrane (203) is 1:1 to 2:

1.

10. The oxygenator according to claim 1, characterized in that The housing (101) comprises a shell (111), an upper cover (102) provided at an open top (111) of the shell, and a lower cover (103) provided at an open bottom of the shell (111); the air inlet (108) is provided on the upper cover (102); the air outlet (109) and the blood outlet (110) are provided on the shell (111) at a position close to the upper cover (102); the water inlet (104), the water outlet (105), the blood inlet (106) and the air outlet (107) are provided on the lower cover (103); The oxygenation module is arranged in the shell, a first blocking layer (301) is arranged between the upper end of the oxygenation module and the upper cover (102), a second blocking layer (302) is arranged between the lower end of the oxygenator module and the lower cover (103), the temperature variable membrane (202) passes through the second blocking layer (302) to communicate with the water inlet (104) and the water outlet (105), the blood inlet (106) passes through the second blocking layer (302) to communicate with the drainage hole (206), the inlet of the oxygen pressure membrane (203) passes through the first blocking layer (301) to communicate with the air inlet (108), and the outlet of the oxygen pressure membrane (203) passes through the second blocking layer (302) to communicate with the air outlet (107).

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