Extracorporeal circulation system

Abstract

The utility model discloses a kind of extracorporeal circulation systems, it is related to medical instrument technical field.Extracorporeal circulation system includes the inflow pipe, handle and outflow pipe connected in turn, inflow pipe is used to connect carotid artery, outflow pipe is used to connect vein;Handle includes shell and the flow through switch, flow through regulator and blood filter being set in shell.In application when inflow pipe is connected into carotid artery, outflow pipe is connected into vein, high-pressure arterial blood flow and low-pressure venous blood flow form pressure difference, make the blood flow of carotid artery reverse flow to vein, establish the blood retrograde passage from carotid artery to vein, can be opened and closed above-mentioned retrograde passage by flow through switch, utilize flow through regulator to adjust the flow rate and flow of blood flow, and utilize blood filter to intercept thrombus and other accumulations falling in interventional operation, reduce the problem that thrombus and other accumulations enter brain with blood and cause cerebral apoplexy or embolism.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to an extracorporeal circulation system. Background Technology

[0002] This section provides only background information relevant to this disclosure and is not necessarily prior art.

[0003] Carotid artery disease usually occurs because thrombi and blood clots accumulate on the side walls of the common carotid artery and internal carotid artery (the arteries through which the heart supplies blood to the brain), thus narrowing the arterial passages.

[0004] The relevant technology usually uses interventional surgery to treat carotid artery disease. However, during the operation, thrombi, blood clots and other accumulated substances are easy to break off and form thrombi that travel with the blood. If the thrombus in the blood eventually enters the brain, it can cause a stroke or embolism. Utility Model Content

[0005] The purpose of this invention is to at least solve the problem that accumulated material that falls off during existing interventional procedures can easily enter the brain and cause stroke or embolism.

[0006] This invention proposes an extracorporeal circulation system, comprising an inflow tube, a handle, and an outflow tube connected in sequence. The inflow tube is used to connect to the carotid artery, and the outflow tube is used to connect to a vein. The handle includes a housing and a flow opener / closer, a flow regulator, and a blood filter disposed within the housing. The flow opener / closer, the flow regulator, and the blood filter are connected in sequence along the arrangement direction from the inflow tube to the outflow tube. The flow opener / closer includes a first main body and an opening / closing element. The first main body has a first blood inlet, a first cavity, and a first blood outlet connected in sequence. The opening / closing element is at least partially installed in the first cavity and slides and seals against the inner wall of the first cavity. The flow opener / closer is used to open or close the blood flow between the inflow tube and the flow regulator, and the flow regulator is used to regulate the blood flow rate and volume entering the blood filter.

[0007] The extracorporeal circulation system of this invention connects the inflow tube to the carotid artery and the outflow tube to the vein. The high-pressure arterial blood flow and the low-pressure venous blood flow create a pressure difference, causing the blood flow in the carotid artery to flow backward into the vein, thus establishing a retrograde blood flow channel from the carotid artery to the vein. This retrograde channel can be opened and closed by a flow opener and a flow regulator to adjust the flow rate and volume of blood. Furthermore, a blood filter intercepts thrombi and other accumulations that may detach during interventional procedures, reducing the risk of stroke or embolism caused by thrombi and other accumulations entering the brain with the bloodstream.

[0008] In addition, the extracorporeal circulation system according to this utility model may also have the following additional technical features:

[0009] In some embodiments of this utility model, the opening and closing member is configured to slide within the first cavity between an open position and a closed position. In the open position, the opening and closing member opens the connection between the first blood inlet and the first blood outlet, and in the closed position, the opening and closing member closes the connection between the first blood inlet and the first blood outlet.

[0010] In some embodiments of this utility model, the flow opening and closing device further includes an elastic reset member, which is located in the first cavity and connected to the opening and closing member. The elastic reset member is configured to drive the opening and closing member to reset from the open position to the closed position, or the elastic reset member is configured to drive the opening and closing member to reset from the closed position to the open position.

[0011] In some embodiments of this utility model, the flow opening and closing device further includes a limiting member. The first cavity is provided with a first opening. The limiting member is fixedly installed in the first opening and is sealed to the inner wall of the first cavity. The opening and closing member passes through the limiting member and is provided with a limiting part for cooperating with the limiting member.

[0012] In some embodiments of this utility model, the flow opening and closing device further includes a first operating member, which is connected to the opening and closing member and at least partially protrudes from the outer shell.

[0013] In some embodiments of this utility model, the flow regulator includes a second main body and an adjusting member. The second main body is provided with a second blood inlet, a second cavity, and a second blood outlet connected in sequence. The second blood inlet is connected to the flow open / close device, and the second blood outlet is connected to the blood filter. The adjusting member is at least partially installed in the second cavity and slides and seals against the inner wall of the second cavity. The adjusting member is configured to slide from a first position to a second position in the second cavity. The adjusting member is configured to gradually reduce the space for blood flow in the second cavity during the process from the first position to the second position.

[0014] In some embodiments of this utility model, the flow regulator further includes a second operating member, which is connected to the regulating member and at least partially protrudes from the housing.

[0015] In some embodiments of this utility model, the second operating member includes a first end close to the adjusting member and a second end away from the adjusting member. The first end is hinged to the adjusting member, and the second operating member has a connecting portion between the first end and the second end. The connecting portion is hinged to the outer shell or the second main body member.

[0016] In some embodiments of this invention, the blood filter is configured to filter blood unidirectionally along the direction from the inlet pipe to the outlet pipe.

[0017] In some embodiments of this utility model, the blood filter includes a third main body and a filter element. The third main body is provided with a third blood inlet and a third blood outlet. The third blood inlet is connected to the flow regulator, and the third blood outlet is connected to the outflow pipe. The filter element is installed in the third main body and is used to filter blood unidirectionally along the direction from the inflow pipe to the outflow pipe.

[0018] In some embodiments of the present invention, the blood filter further includes a one-way membrane installed at the third blood outlet, the one-way membrane being configured to allow blood to flow unidirectionally from the inlet pipe to the outlet pipe. Attached Figure Description

[0019] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0020] Figure 1 A schematic diagram of the extracorporeal circulation system provided in an embodiment of the present invention is shown.

[0021] Figure 2 A schematic cross-sectional view of the extracorporeal circulation system provided in an embodiment of the present invention is shown.

[0022] Figure 3 A schematic diagram illustrating the connection between the flow opener and flow regulator of the extracorporeal circulation system provided in this embodiment of the present invention is shown.

[0023] Figure 4 A schematic diagram of the structure of a flow opener / closer for an extracorporeal circulation system provided in an embodiment of the present invention is shown.

[0024] Figure 5 A schematic diagram of another flow-opening / closing device for the extracorporeal circulation system provided in this embodiment of the present invention is shown.

[0025] Figure 6 A schematic diagram of the flow regulator of the extracorporeal circulation system provided in an embodiment of the present invention is shown.

[0026] Figure 7 A schematic diagram of the structure of a blood filter in an extracorporeal circulation system provided in an embodiment of the present invention is shown.

[0027] Figure 8 A schematic diagram of the structure of the third main component of the blood filter of the extracorporeal circulation system provided in this embodiment of the present invention is shown.

[0028] The attached figures are labeled as follows:

[0029] 100. Extracorporeal circulation system;

[0030] 10. Inflow pipe;

[0031] 20. Handle;

[0032] 21. Outer shell;

[0033] 22. Flow opener / closer; 221. First main body component; 2211. First blood inlet; 2212. First cavity; 2213. First blood outlet; 2214. First connecting pipe section; 2215. Second connecting pipe section; 2216. First opening; 2217. Cylinder cover; 222. Opening / closing component; 2221. Limiting part; 223. Elastic reset component; 224. Limiting component; 2241. Annular groove; 225. First operating component; 2251. Insertion hole; 226. First sealing ring; 227. Second sealing ring; 228. Third sealing ring; 229. Fourth sealing ring; 2210. Fifth sealing ring; 2220. Sealing ring; 2230. Cam component;

[0034] 23. Flow regulator; 231. Second main body; 2311. Second blood inlet; 2312. Second cavity; 2313. Second blood outlet; 2314. Third connecting pipe section; 2315. Fourth connecting pipe section; 232. Adjusting component; 233. Second operating component; 2331. First end; 2332. Second end; 2333. Connecting part; 2334. First pressing part; 2335. Second pressing part;

[0035] 24. Blood filter; 241. Third main component; 2411. Third blood inlet; 2412. Third blood outlet; 242. Filter element; 243. One-way membrane;

[0036] 30. Outflow tube. Detailed Implementation

[0037] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary 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 this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0038] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0039] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0040] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented as "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0041] Additionally, it should be noted that in the field of interventional medical devices, the end of a medical device implanted in the human or animal body, or the delivery system that delivers the medical device, closer to the operator is generally referred to as the "proximal end," and the end farther from the operator is referred to as the "distal end." Based on this principle, the "proximal end" and "distal end" of any component of a medical device or delivery system are defined. "Axial direction" generally refers to the length direction of the medical device during delivery, and "radial direction" generally refers to the direction of the medical device perpendicular to its "axial direction." Based on this principle, the "axial direction" and "radial direction" of any component of a medical device are defined.

[0042] Combined with appendix Figure 1-3 As shown, this embodiment provides an extracorporeal circulation system 100, including an inflow tube 10, a handle 20 and an outflow tube 30 connected in sequence. In this embodiment, both the inflow tube 10 and the outflow tube 30 can be deformable flexible tube structures, and their material can be plastic.

[0043] One end of the inflow tube 10 is connected to and communicates with the handle 20, while the other end is directly connected to the arterial sheath of the carotid artery. Similarly, one end of the outflow tube 30 is connected to and communicates with the handle 20, while the other end is directly connected to the venous sheath of the vein.

[0044] In some embodiments, the vein can be the femoral vein, but it can also be other veins, such as the popliteal vein, tibial vein, etc., as long as the blood from the carotid artery can flow into the vein for circulation. This embodiment will not list them all.

[0045] The handle 20 includes a housing 21 and a flow opener 22, a flow regulator 23 and a blood filter 24 disposed within the housing 21. The handle 20 can be made of composite materials such as plastic, metal or carbon fiber. The housing 21 is the mounting base for functional devices such as the flow opener 22, the flow regulator 23 and the blood filter 24, and also serves to protect the aforementioned functional devices.

[0046] The shape of the housing 21 is not limited, but the housing 21 has a receiving cavity inside to accommodate the installation of functional devices such as the flow opener 22, the flow regulator 23, and the blood filter 24.

[0047] Along the arrangement direction from the inflow pipe 10 to the outflow pipe 30, the flow opener 22, the flow regulator 23, and the blood filter 24 are connected in sequence. That is to say, when the extracorporeal circulation system 100 of this embodiment is performing extracorporeal circulation, the blood entering the inflow pipe 10 first passes through the flow opener 22, then passes through the flow regulator 23 and the blood filter 24 in sequence, and then flows into the outflow pipe 30, and flows into the vein through the outflow pipe 30.

[0048] The aforementioned flow opener / closer 22 is used to open or close the blood flow between the inflow tube 10 and the flow regulator 23, thereby opening and closing the extracorporeal circulation system 100, so as to facilitate medical staff to selectively open and close the extracorporeal circulation system 100.

[0049] The flow regulator 23 is used to regulate the blood flow rate and volume entering the blood filter 24, thereby facilitating medical staff to adjust the blood flow rate and volume of the extracorporeal circulation system 100, avoiding discomfort caused by excessive or insufficient blood flow, or discomfort caused by sudden changes in blood flow.

[0050] Before placing a stent at the stenotic site of the carotid artery, the inflow tube 10 of the extracorporeal circulation system 100 of this embodiment is connected to the carotid artery, and the outflow tube 30 is connected to the vein. The high-pressure arterial blood flow and the low-pressure venous blood flow create a pressure difference, causing the blood flow in the carotid artery to flow backward to the vein, thus establishing a blood retrograde channel from the carotid artery to the vein. The retrograde channel can be opened and closed by the flow opener 22, and the flow rate and volume of blood flow can be adjusted by the flow regulator 23. Furthermore, the blood filter 24 intercepts thrombi and other accumulations that are dislodged during the interventional procedure, reducing the risk of stroke or embolism caused by thrombi and other accumulations entering the brain with the blood.

[0051] Combined with appendix Figure 4As shown, in some examples, optionally, the flow opener / closer 22 of this embodiment includes a first main body 221 and an opener / closer 222. The first main body 221 is provided with a first blood inlet 2211, a first cavity 2212 and a first blood outlet 2213 connected in sequence. In addition, the first main body 221 may also be provided with a first connecting pipe section 2214 connected to the first blood inlet 2211, and the inlet pipe 10 is connected through the first connecting pipe section 2214. The first main body 221 may also be provided with a second connecting pipe section 2215 connected to the first blood outlet 2213, and the second connecting pipe section 2215 is used to connect to the flow regulator 23.

[0052] The opening and closing member 222 in this embodiment can be columnar or rod-shaped, or of course, other shapes, as long as it can cooperate with the first cavity 2212 to perform opening and closing actions.

[0053] At least a portion of the opening / closing element 222 is installed in the first cavity 2212 and slides and seals with the inner wall of the first cavity 2212. The sliding and sealing fit means that the portion of the opening / closing element 222 located in the first cavity 2212 can slide relative to the inner wall of the first cavity 2212 and remains sealed during and after sliding.

[0054] Specifically, a first sealing ring 226 can be installed at the lower end of the opening / closing member 222, and a second sealing ring 227 can be installed at the upper end. The first sealing ring 226 slides and seals with the inner wall of the first cavity 2212, and the second sealing ring 227 slides and seals with the limiting member 224 located at the top opening of the first cavity 2212.

[0055] The opening / closing element 222 is configured to slide between an open position and a closed position within the first cavity 2212. In the open position, the opening / closing element 222 opens the connection between the first blood inlet 2211 and the first blood outlet 2213. In the closed position, the opening / closing element 222 closes the connection between the first blood inlet 2211 and the first blood outlet 2213.

[0056] Figure 4 The flow open / close device 22 is one embodiment of this application. In some embodiments, the open state can be... Figure 4 The second sealing ring 227 is located above the first blood inlet 2211 and the first blood outlet 2213. At this time, the blood flowing into the first blood inlet 2211 can directly enter the first outlet after entering the first cavity 2212.

[0057] The closed state can be achieved by pressing down the opening / closing member 222 of this embodiment. The opening / closing member 222 is provided with a limiting part 2221, and a third sealing ring 228 is installed on the limiting part 2221. After the third sealing ring 228 descends, it fits against the inner wall on the upper side of the first blood inlet 2211 and the first blood outlet 2213 respectively, blocking the connection between the first blood inlet 2211 and the first blood outlet 2213, so that the blood flowing in from the first blood inlet 2211 cannot enter the first blood outlet 2213.

[0058] In some examples, the flow opener 22 may optionally include an elastic reset member 223 located within the first cavity 2212. The opener 222 has a blind hole for the elastic reset member 223 to be inserted. The elastic reset member 223 may be a spring. The elastic reset member 223 is inserted into the blind hole of the opener 222, and then its lower end abuts against the bottom wall of the first cavity 2212.

[0059] Figure 4 The flow-through switch 22 is normally open. When it is necessary to close the connection between the first blood inlet 2211 and the first blood outlet 2213, the switch 222 is pressed down. At this time, the elastic reset member 223 is compressed, generating elastic force. When it is necessary to reopen the connection between the first blood inlet 2211 and the first blood outlet 2213, the pressure on the switch 222 is directly released. At this time, the elastic reset member 223, under its own elastic action, drives the switch 222 to return to its original position. Figure 4 The open state in the middle.

[0060] Additionally, in some examples, the flow opener 22 may optionally include a limiting member 224, which may be a limiting ring structure. The first main body 221 has a first opening 2216 at the upper end of the first cavity 2212. The limiting member 224 has an annular groove 2241, and a fourth sealing ring 229 is installed in the annular groove 2241. The limiting member 224 is fixedly and sealed to the first opening 2216 by the fourth sealing ring 229 and is sealed to the inner wall of the first cavity 2212.

[0061] The limiting member 224 is provided with a through hole for the opening and closing member 222 to pass through. The opening and closing member 222 passes through the limiting member 224 and abuts against the limiting member 224 through the limiting part 2221 when it is in the open state, preventing the opening and closing member 222 from coming out of the first cavity 2212 under the elastic action of the elastic reset member 223. Moreover, when assembling the opening and closing member 222, the opening and closing member 222 and the elastic reset member 223 can be directly installed into the first cavity 2212 first, and then the limiting member 224 can be installed, which facilitates the assembly of the entire flow opening and closing device 22.

[0062] In some examples, the flow opener 22 may optionally include a first actuating element 225 connected to the opener 222 and at least partially protruding from the housing 21.

[0063] The first operating element 225 can be a button or a press cap structure. The first operating element 225 has an insertion hole 2251. The upper end of the opening and closing element 222 is directly inserted into the opening hole. The first operating element 225 can be fully or partially protruding from the outer shell 21, so as to facilitate medical staff to press the opening and closing element 222 and drive the opening and closing element 222 to move between the above-mentioned open position and closed position.

[0064] Combined with appendix Figure 5 As shown, this embodiment also provides another structure for the flow opener / closer 22, which is the same as the flow opener / closer 22 described above in that it includes a first main body 221, an opening / closing member 222, a limiting member 224 and an elastic reset member 223, and the first main body 221 is provided with the first blood inlet 2211, the first cavity 2212 and the first blood outlet 2213 described above.

[0065] and Figure 4 The difference between the flow-through switch 22 and the flow-through switch 22 is that, Figure 5 The flow opening and closing device 22 also includes a cylinder cover 2217, a cam 2230 and a sealing ring 2220. Moreover, the limiting part 2221 does not seal with the limiting part 224 to close the connection between the first blood inlet 2211 and the first blood outlet 2213, but cooperates with the sealing ring 2220 located below the limiting part 224 to close the first blood outlet 2213.

[0066] The cap 2217 is fixedly installed at the top opening of the first main body 221. The sealing ring 2220 is sealed and installed below the limiting member 224 and the first blood outlet 2213 by the fifth sealing ring 2210, and is located above the first blood inlet 2211. The cam member 2230 is connected between the opening / closing member 222 and the first operating member 225, and can rotate between the opening / closing member 222 and the first operating member 225.

[0067] and Figure 5The flow opening and closing device 22 is in a normally closed state, and the elastic reset member 223 is in a normally compressed state. The first operating member 225, the cylinder cover 2217, the cam member 2230 and the opening and closing member 222 are similar to the structure of a press pen. Specifically, the first operating member 225 or the opening and closing member 222 is provided with multiple inclined grooves (not shown in the figure) along the circumference. At this time, the cam member 2230 contacts one of the deep inclined grooves, so that the limiting part 2221 is located in the first position of the first cavity 2212. The sealing ring 2220 contacts the limiting part 2221 of the opening and closing member 222 and together they form a stop that blocks the communication between the first blood inlet 2211 and the first blood outlet 2213.

[0068] When it is necessary to release the obstruction between the first blood inlet 2211 and the first blood outlet 2213, the first operating member 225 and the opening and closing member 222 are pressed down, causing the cam member 2230 to rotate along the guide of the inclined groove. At this time, the cam member 2230 enters a shallow inclined groove under the drive of the elastic reset member 223, and the opening and closing member 222 is locked. The opening and closing member 222 moves downward to a certain position, releasing the contact between the limiting part 2221 and the sealing ring 2220 below the limiting member 224, thereby opening the connection between the first blood inlet 2211 and the first blood outlet 2213.

[0069] When it is necessary to close the connection between the first blood inlet 2211 and the first blood outlet 2213 again, the first operating member 225 is pressed down again to make the cam member 2230 rotate along the guide of the inclined groove. Driven by the elastic reset member 223, the cam member 2230 enters a deep inclined groove again, so that the sealing ring 2220 below the limiting member 224 contacts the limiting part 2221, thereby closing the connection between the first blood inlet 2211 and the first blood outlet 2213.

[0070] Combined with appendix Figure 6 In some examples, the flow regulator 23 may optionally include a second main body 231 and an adjustment member 232. The second main body 231 is provided with a second blood inlet 2311, a second cavity 2312 and a second blood outlet 2313 connected in sequence. The second blood inlet 2311 is connected to the flow opener 22 and the second blood outlet 2313 is connected to the blood filter 24.

[0071] The second main component 231 may be provided with a third connecting pipe section 2314 and a fourth connecting pipe section 2315. One end of the third connecting pipe section 2314 is connected to the second blood inlet 2311, and the other end is used to connect to the aforementioned second connecting pipe section 2215. One end of the fourth connecting pipe section 2315 is connected to the second blood outlet 2313, and the other end is used to connect to the blood filter 24.

[0072] The shape and material of the second main component 231 may be the same as or different from the aforementioned first main component 221, as long as it can meet the functional requirements of flow regulation.

[0073] The adjusting member 232 is at least partially installed in the second cavity 2312 and slides and seals with the inner wall of the second cavity 2312. The adjusting member 232 can be in the form of a column or rod. The adjusting member 232 can be made of rubber, silicone or other materials. It can directly seal with the inner wall of the second cavity 2312 and slide relative to it, without the need for a sealing ring structure.

[0074] In this embodiment, the adjusting member 232 is configured to slide from a first position to a second position within the second cavity 2312. During the process of adjusting member 232 moving from the first position to the second position, the space for blood flow in the second cavity 2312 gradually decreases.

[0075] The first position can be Figure 6 The second position of the adjusting member 232 can be a position where the adjusting member 232 moves downward so that more of itself is located inside the second cavity 2312. In some embodiments, the second blood inlet 2311 can be located above the second blood outlet 2313. In this case, the second position can be a position where the adjusting member 232 partially or completely blocks the second blood inlet 2311.

[0076] To facilitate operation by medical personnel, in some embodiments, the flow regulator 23 further includes a second operating member 233, which is connected to the regulating member 232 and at least partially protrudes from the housing 21. The operator can adjust the blood flow rate and velocity within the second cavity 2312 by pressing down or lifting the second operating member 233.

[0077] Since the adjusting member 232 of the flow regulator 23 is in sliding sealing fit with the inner wall of the second cavity 2312, after the adjusting member 232 is pressed down, it is difficult to drive the adjusting member 232 to return to its original position even by means of elastic members such as springs. Therefore, this embodiment further improves the structure of the second operating member 233.

[0078] In some examples, optionally, the second operating member 233 includes a first end 2331 near the adjusting member 232 and a second end 2332 away from the adjusting member 232. The first end 2331 is hinged to the adjusting member 232. The second operating member 233 has a connecting portion 2333 between the first end 2331 and the second end 2332. The connecting portion 2333 is hinged to the housing 21 or the second main body member 231. The connecting portion 2333 can be a connecting hole or a protrusion with a connecting hole.

[0079] This structure makes the second operating component 233 a lever structure. When the second end 2332 is pressed down, it can drive the adjusting component 232 to be lifted, thus making it more convenient for medical staff to operate.

[0080] In some embodiments, a first pressing part 2334 and a second pressing part 2335 may be provided on the surface of the second operating member 233 away from the adjusting member 232. The first pressing part 2334 is located at the first end 2331, and the second pressing part 2335 is located at the second end 2332. The first pressing part 2334 and the second pressing part 2335 may be rough surfaces or multiple protrusions to increase the friction with the fingers of medical staff and further facilitate medical staff to press down or lift the adjusting member 232.

[0081] Combined with appendix Figure 7 As shown, in some examples, the blood filter 24 is optionally configured to filter blood unidirectionally along the direction from the inlet pipe 10 to the outlet pipe 30.

[0082] That is, the blood entering the blood filter 24 from the flow regulator 23 can only flow from the blood filter 24 to the outflow tube 30, and cannot flow back from the outflow tube 30 to the blood filter 24.

[0083] The blood filter 24 can have various structural forms, such as a one-way valve combined with a filter screen (this embodiment is not shown in the figure), or something like... Figure 7 and Figure 8 As shown, the liquid filter includes a third main body 241 and a filter element 242. The third main body 241 can be a structure that is approximately cylindrical with openings at both ends. One end of the third main body 241 is provided with a third blood inlet 2411, and the other end is provided with a third blood outlet 2412. The third blood inlet 2411 is connected and communicates with the second blood outlet 2313 mentioned above, and the third blood outlet 2412 is connected and communicates with one end of the outflow pipe 30 in this embodiment.

[0084] The filter element 242 is a support-type filter screen, the shape and size of which match the third cavity of the third main body 241. It includes a support and a filter screen covering the outside of the support. The filter element 242 can be assembled into the third main body 241 by means of plugging or other means. The filter screen of the filter element 242 is configured as a one-way filter screen, which can filter blood one-way along the direction from the inflow pipe 10 to the outflow pipe 30.

[0085] To ensure unidirectional filtration, in some examples, optionally, the blood filter 24 in this embodiment is also equipped with a unidirectional membrane 243 at the third blood outlet 2412. The unidirectional membrane 243 is configured to allow blood to flow unidirectionally from the inlet pipe 10 to the outlet pipe 30. The unidirectional membrane 243 can be a polymer membrane. The blood flowing in the forward direction can break through the polymer membrane and enter the outlet pipe 30. When the blood in the outlet pipe 30 flows in the reverse direction to the blood filter 24, the polymer membrane closes to achieve a unidirectional check function.

[0086] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. An extracorporeal circulation system, characterized in that, It includes an inlet tube, a handle, and an outlet tube connected in sequence, wherein the inlet tube is used to connect to the carotid artery, and the outlet tube is used to connect to a vein; The handle includes a housing and a flow opener, a flow regulator, and a blood filter disposed within the housing. The flow opener, the flow regulator, and the blood filter are connected in sequence along the arrangement direction from the inlet pipe to the outlet pipe. The flow opening and closing device includes a first main body and an opening and closing component. The first main body is provided with a first blood inlet, a first cavity and a first blood outlet connected in sequence. The opening and closing component is at least partially installed in the first cavity and slides and seals with the inner wall of the first cavity. The flow opener / closer is used to open or close the blood flow between the inlet tube and the flow regulator, and the flow regulator is used to regulate the blood flow rate and volume entering the blood filter.

2. The extracorporeal circulation system according to claim 1, characterized in that, The opening and closing element is configured to slide within the first cavity between an open position and a closed position. In the open position, the opening and closing element opens the connection between the first blood inlet and the first blood outlet. In the closed position, the opening and closing element closes the connection between the first blood inlet and the first blood outlet.

3. The extracorporeal circulation system according to claim 2, characterized in that, The flow opening and closing device further includes an elastic reset member located in the first cavity and connected to the opening and closing member. The elastic reset member is configured to drive the opening and closing member to reset from the open position to the closed position, or the elastic reset member is configured to drive the opening and closing member to reset from the closed position to the open position.

4. The extracorporeal circulation system according to claim 2, characterized in that, The flow opening and closing device also includes a limiting member. The first cavity has a first opening. The limiting member is fixedly installed in the first opening and is sealed to the inner wall of the first cavity. The opening and closing member passes through the limiting member and has a limiting part for cooperating with the limiting member.

5. The extracorporeal circulation system according to any one of claims 2-4, characterized in that, The flow opening and closing device further includes a first operating element, which is connected to the opening and closing element and at least partially protrudes from the housing.

6. The extracorporeal circulation system according to claim 1, characterized in that, The flow regulator includes a second main body and an adjusting member. The second main body has a second blood inlet, a second cavity, and a second blood outlet connected in sequence. The second blood inlet is connected to the flow open / close device, and the second blood outlet is connected to the blood filter. The adjusting member is at least partially installed in the second cavity and slides and seals against the inner wall of the second cavity. The adjusting member is configured to slide from a first position to a second position in the second cavity. The adjusting member is configured to gradually reduce the space for blood flow in the second cavity during the process from the first position to the second position.

7. The extracorporeal circulation system according to claim 6, characterized in that, The flow regulator further includes a second operating element connected to the regulating element and at least partially protruding from the housing.

8. The extracorporeal circulation system according to claim 7, characterized in that, The second operating member includes a first end close to the adjusting member and a second end away from the adjusting member. The first end is hinged to the adjusting member. The second operating member has a connecting portion between the first end and the second end, and the connecting portion is hinged to the housing or the second main body.

9. The extracorporeal circulation system according to claim 8, characterized in that, The blood filter is configured to filter blood unidirectionally from the inlet pipe to the outlet pipe. The blood filter includes a third main body and a filter element. The third main body has a third blood inlet and a third blood outlet. The third blood inlet is connected to the flow regulator, and the third blood outlet is connected to the outlet pipe. The filter element is installed inside the third main body.

10. The extracorporeal circulation system according to claim 9, characterized in that, The blood filter also includes a one-way membrane installed at the third blood outlet, the one-way membrane being configured to allow blood to flow unidirectionally from the inlet tube to the outlet tube.

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