Mother-son type double-pump ECMO power system and flow control method

Abstract

The invention provides a primary-secondary type double-pump ECMO power system and a flow control method.The primary-secondary type double-pump ECMO power system comprises a blood return main path, a first branch and a second branch, one end of the blood return main path is a venous indwelling catheter end, the other end of the blood return main path is provided with the first branch and the second branch which are connected in parallel, and the first branch and the second branch can be opened and closed; wherein the first branch is an artery branch, the second branch is an artery branch or a vein branch, the main blood return path is communicated with the first branch to form a first loop, and the main blood return path is communicated with the second branch to form a second loop; the child pump is arranged on the first branch, and the mother pump is arranged on the blood return main path. According to the child-mother type double-pump ECMO power system and the flow control method, a'one-mother-one-child 'double-pump structure is adopted, the mother pump is mainly responsible for venous drainage and overall flow output, and the child pump is independently responsible for output of the first branch, namely accurate flow adjustment of the artery or vein blood return end.

Description

Technical Field

[0001] The present invention relates to the field of ECMO technology, and in particular to a mother-and-child dual-pump ECMO power system and a flow control method. Background Art

[0002] Extracorporeal membrane oxygenation, commonly known as an "artificial lung," is an extracorporeal life support technology that supports the cardiopulmonary function of critically ill patients. Clinically, there are two main modes: venovenous extracorporeal membrane oxygenation (ECMO) and venous-vaginal extracorporeal membrane oxygenation (VA-ECMO). VV-ECMO is primarily used for patients with severe respiratory failure. Blood is drawn from a vein, oxygenated by an oxygenator, and then returned to another vein, replacing or assisting the lungs' gas exchange function. VA-ECMO, on the other hand, is primarily used for patients with cardiogenic shock or cardiac arrest to support the circulatory system. Blood is drawn from a vein, oxygenated by an oxygenator, and then returned to an artery. However, in clinical practice, many patients not only suffer from severe respiratory failure but also cardiac failure. In these cases, a hybrid ECMO mode, such as venovenous-vaginal ECMO, is often required. This mode requires two blood return lines for arterial and venous return, respectively.

[0003] However, the current clinical ECMO equipment is only equipped with a single blood pump. When the hybrid ECMO mode is used, it is impossible to make individual adjustments to complex clinical conditions, and organ perfusion cannot be guaranteed. Taking VA-ECMO as an example, the VA-ECMO blood return end often uses the femoral artery catheter, and the patient's brain tissue, upper body, etc. cannot be effectively perfused. At this time, dual arterial lines can be added for return transfusion, and the common carotid artery return end can be added to increase upper body perfusion. Since there is only a single blood pump on the ECMO device, it is impossible to precisely control the blood flow of the upper body, and there is still a risk of high brain perfusion, which is not conducive to improving the North-South syndrome.

[0004] Therefore, in order to solve the above problems, the present invention proposes a parent-child dual-pump ECMO power system that can precisely regulate the flow rate of blood transfusion to achieve the purpose of individualized treatment. Summary of the Invention

[0005] In order to solve the problems existing in the use of the above-mentioned existing ECMO equipment, the present invention provides a new type of mother-and-child dual-pump ECMO power system and flow control method.

[0006] According to one object of the present invention, the present invention provides a mother-and-child dual-pump ECMO power system, comprising a main blood return path, a first branch, and a second branch, wherein one end of the main blood return path is a venous catheterization end, and the other end of the main blood return path is provided with the first branch and the second branch connected in parallel, wherein the first branch is an arterial branch, and the second branch is an arterial branch or a venous branch, the main blood return path and the first branch are connected to form a first loop, and the main blood return path and the second branch are connected to form a second loop;

[0007] A mother pump and a sub-pump, wherein the sub-pump is provided on the first branch line and the mother pump is provided on the main blood return line;

[0008] A flow control assembly and a real-time sensor are provided on both the first and second loops. The real-time sensor is configured to obtain output flow data of the sub-pump and the main pump. The real-time sensor is electrically connected to the flow control assembly.

[0009] The flow control component is preset with an arterial return ratio, which is equal to the ratio of the sub-pump flow to the main pump flow. The flow control component is configured to adjust the flow of the sub-pump and the main pump to maintain the arterial return ratio.

[0010] Preferably, the flow control component further comprises:

[0011] A controller is electrically connected to the real-time sensor, and the controller controls the connection between the sub-pump and the main pump respectively. The controller is provided with an adjustable arterial return ratio.

[0012] Preferably, the controller is provided with a control panel, and the mother pump and the sub-pump are each provided with a separate control panel.

[0013] Preferably, the control panel is provided with a speed knob, a pump speed display and an alarm prompt light.

[0014] Preferably, the sub-pump is a high-precision magnetic pump.

[0015] Preferably, the flow control component includes an electronic control valve, the sub-pump and the main pump are both connected to the electronic control valve, and the controller is connected to the electronic control valve.

[0016] Preferably, a membrane lung is installed on the main blood return path, and the membrane lung is located on the output end side of the mother pump;

[0017] The real-time sensing component includes a mother pump flow sensor and a sub-pump flow sensor. The mother pump flow sensor is arranged on the main blood return path between the output end of the mother pump and the membrane lung, and the sub-pump flow sensor is arranged on one side of the output end of the sub-pump.

[0018] The present invention also provides a flow control method based on the above-mentioned mother-child dual-pump ECMO power system, the flow control method comprising the following steps:

[0019] Select an appropriate ECMO support mode according to the patient's clinical condition and place a tube on the patient, connecting the drainage line and the blood return line to the blood return main line, the branch line 1, and the branch line 2 in the mother-and-child dual-pump ECMO power system respectively;

[0020] Starting the mother pump and the slave pump in sequence;

[0021] monitoring the output flow rates of the sub-pump and the main pump, selecting an arterial return ratio according to the patient's physical parameters, and adjusting the output flow rates of the main pump and the sub-pump through the controller;

[0022] Shut down and remove the mother-and-child dual-pump ECMO power system.

[0023] Preferably, shutting down and removing the parent-child dual-pump ECMO power system comprises the following specific steps:

[0024] Gradually reduce the sub-pump flow rate to minimum or turn it off;

[0025] Gradually reduce the flow rate of the main pump to the minimum maintenance value;

[0026] After observing that the patient's own circulation is stable, disconnect the pipeline of the mother-and-child dual-pump ECMO power system, remove the catheter, and apply pressure to stop bleeding.

[0027] Preferably, after the mother pump and the sub-pump are started in sequence, multi-mode switching can be performed, and the multi-mode switching includes the following steps:

[0028] adjusting the pumping speed of the mother pump;

[0029] Connect or close the corresponding circuit;

[0030] The sub pump is adjusted to the target flow rate.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] This mother-and-child dual-pump ECMO power system and flow control method uses a "one mother and one child" dual-pump structure. The mother pump is mainly responsible for venous drainage and overall flow output, while the daughter pump is independently responsible for the output of branch one, that is, the precise flow regulation of the arterial or venous return end.

[0033] The main pump and sub-pump are connected by pipelines, and the flow control components are used to realize the distribution control of the total flow. Among them, the real-time sensor monitors the flow on the sub-pump and the main pump. The flow control components in the system can dynamically adjust the blood flow ratio of circuit one and circuit two according to the different clinical stages and perfusion needs of the patients, realize the branch autonomy and unified allocation of flow control, and achieve the purpose of individualized treatment.

[0034] The present invention is further described below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic diagram of the VAA mode of a mother-and-child dual-pump ECMO power system according to the present invention;

[0036] Figure 2 This is a schematic diagram of the VVA mode of a mother-and-child dual-pump ECMO power system described in the present invention;

[0037] Figure 3 This is a schematic diagram of the VV mode of a mother-and-child dual-pump ECMO power system according to the present invention;

[0038] Figure 4 This is a schematic diagram of the VA mode of a mother-and-child dual-pump ECMO power system described in the present invention. DETAILED DESCRIPTION

[0039] The following description is intended to fully illustrate the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are intended to be exemplary only, and those skilled in the art will readily appreciate other obvious variations. The basic principles of the present invention defined in the following description may be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0040] See also Figure 1-4 The present invention provides a technical solution: a mother-and-child dual-pump ECMO power system, comprising a main blood return path 100, a branch path 1 200, and a branch path 2 300. One end of the main blood return path 100 is a venous catheterization end, and the other end of the main blood return path 100 is provided with the branch path 1 200 and the branch path 2 300 connected in parallel, wherein the branch path 1 200 is an arterial branch, and the branch path 2 300 is an arterial branch or a venous branch. The main blood return path 100 and the branch path 1 200 are connected to form a loop 1, and the main blood return path 100 and the branch path 2 300 are connected to form a loop 2.

[0041] A mother pump 400 and a sub-pump 500 with adjustable output flow rates. The sub-pump 500 is provided on the branch 1 200, and the mother pump 400 is provided on the blood return main path 100. The output flow rate of the mother pump 400 is equal to the sum of the output flow rate of the sub-pump 500 and the output end flow rate of the second loop.

[0042] The ECMO power system includes at least two working modes, namely single pump mode and mixed mode. When the ECMO power system is in single pump mode, the sub-pump 500 is switched to a non-operating state. When the ECMO power system is in mixed mode, the sub-pump 500 and the main pump 400 are both in an operating state.

[0043] This mother-and-child dual-pump ECMO power system adopts a "one mother and one child" dual-pump structure, breaking the limitations of the traditional single-pump ECMO system design. The mother pump 400 is mainly responsible for venous drainage and the output of the overall flow, and the child pump 500 is independently responsible for the output of branch 1 200, that is, the precise flow regulation of the arterial or venous return end. The mother pump 400 and the child pump 500 are connected by a pipeline to realize the distribution control of the total flow. Through the diversion mechanism of the child pump 500, the system can dynamically adjust the blood flow ratio of circuit 1 and circuit 2 according to the different clinical stages and perfusion needs of the patient, and realize the branch autonomy and unified deployment of flow control.

[0044] Furthermore, the parent-child dual-pump ECMO power system also includes:

[0045] A flow control component 600 and a real-time sensor are provided on both loop one and loop two. The flow control component 600 is configured to obtain flow data through the real-time sensor to control the connection between the mother pump 400 and the sub-pump 500. The flow control component 600 is preset with an arterial return ratio, which is equal to the ratio of the flow of the sub-pump 500 to the flow of the mother pump 400. The flow control component 600 is configured to adjust the flow of the sub-pump 500 and the mother pump 400 to maintain the arterial return ratio. The flow control component can dynamically regulate the blood flow ratio of loop one and loop two according to the different clinical stages and perfusion needs of the patient, realize the branch autonomy and unified deployment of flow control, and achieve the purpose of individualized treatment.

[0046] For details, see Figure 1 and 2 The circuit 1 is driven by the sub-pump 500, which is a high-precision magnetic pump. The flow control component 600 includes an electronic control valve. Both the sub-pump 500 and the main pump 400 are provided with electronic control valves to achieve multi-dimensional control of the pump speed, flow and pressure in the circuit.

[0047] The circuit 1 is controlled by the mother pump 400 to maintain drainage stability and ensure that the total flow dynamically matches the output of the sub-pump 500.

[0048] The real-time sensing components include a main pump flow sensor 701 and a sub-pump flow sensor 702;

[0049] A membrane lung is installed on the blood return main path 100, and the membrane lung is located on the output side of the mother pump 400. The mother pump flow sensor 701 is set on the blood return main path 100 between the output end of the mother pump 400 and the membrane lung. The mother pump flow sensor 701 is used to monitor the total output flow of the ECMO system. The flow sensor is used to monitor the instantaneous flow of the two circuits in real time, and the device interface displays it synchronously;

[0050] The sub-pump flow sensor 702 is arranged on the branch 1 200. The sub-pump flow sensor 702 is located between the output end of the sub-pump 500 and the end of the branch 1 200. The branch is a carotid artery return tube or a femoral artery return tube. The sub-pump flow sensor 702 is used to monitor the arterial return flow provided by the sub-pump 500 to achieve arteriovenous flow ratio regulation.

[0051] This independent control mechanism enables the system to more flexibly adapt to various circuit modes such as V-AV and V-AA, meet the needs of patients under different hemodynamic conditions, and effectively avoid clinical risks such as perfusion imbalance, insufficient cerebral perfusion, and pulmonary vein congestion. When only the main pump 400 is enabled to maintain venous circulation, the sub-pump 500 will be placed in standby or backup mode.

[0052] Continue to see Figure 1 and 2 Furthermore, the mother-child dual-pump ECMO power system can perform dual-path flow monitoring and diversion ratio evaluation. The flow control component 600 also includes a controller 601, and the controller 601 controls the connection between the sub-pump 500 and the mother pump 400. Specifically, the controller 601 is connected to the electronic control valves on the sub-pump 500 and the mother pump 400, respectively. The controller 601 is electrically connected to the mother pump flow sensor 701 and the sub-pump flow sensor 702, respectively. The controller 601 is configured to adjust the pump speed of the mother pump 400 and the sub-pump 500 according to the proportion of arterial return, where the proportion of arterial return = sub-pump 500 flow / mother pump 400 flow.

[0053] In one embodiment, the parent-child dual-pump ECMO power system is manually adjusted, and the arterial return ratio can be manually calculated. By adjusting the pump speed, precise shunt ratio control can be achieved to meet the personalized treatment needs of brain, heart, and systemic perfusion in different clinical stages. Specifically, the controller 601 is provided with a control panel 602, and the mother pump 400 and the child pump 500 are each equipped with a separate control panel 602. The control panel 602 is provided with a speed knob 6021, a pump speed display 6022, and an alarm prompt light. When in use, the arterial return ratio can be manually calculated to adjust the speed of the child pump 500 to control the arterial return ratio, thereby reducing the heart load or enhancing brain perfusion. The mother pump 400 is used to stabilize the overall drainage and oxygenation efficiency, wherein the pump speed display 6022 on the control panel 602 is used to display the pump speeds of the child pump 500 and the mother pump 400.

[0054] In another embodiment, the controller 601 can directly preset the arterial return ratio, obtain the pumping speeds of the main pump 400 and the sub-pump 500 through the flow sensor, automatically calculate the arterial return ratio, and adjust the pumping speeds of the two pumps in real time.

[0055] This mother-and-child dual-pump ECMO power system has good mode compatibility and flexible switching capabilities, and can flexibly adapt to various ECMO clinical modes. In mixed ECMO modes such as V-AV and VAA, the arteriovenous circuit is independently controlled by the mother pump 400 and the daughter pump 500, respectively, to achieve precise perfusion distribution. When the patient only needs VV-ECMO or VA-ECMO support, that is, venous drainage-venous / arterial return, see Figure 3 and 4 The system can be flexibly switched to a single-pump working mode. Specifically, the corresponding branch is closed, and only the mother pump 400 is enabled to maintain venous circulation, and the sub-pump 500 is placed in standby or backup mode without dismantling the pipeline system, thereby simplifying operation and avoiding waste of resources. It can also be upgraded to a mixed mode at any time to cope with changes in the condition.

[0056] The present invention also provides a flow control method based on the above-mentioned mother-child dual-pump ECMO power system, the flow control method comprising the following steps:

[0057] S1. Select the appropriate ECMO support mode and place the patient on the cannula based on the patient's clinical condition. Modes include:

[0058] See also Figure 4 VA mode: drainage from a vein (such as the internal jugular vein or femoral vein) and blood return to an artery (such as the femoral artery or internal carotid artery);

[0059] See also Figure 3 , VV mode: venous drainage and venous return, both through the internal jugular and femoral veins;

[0060] See also Figure 2 , V-AV mode: venous drainage (such as internal jugular vein or femoral vein), arterial and venous return simultaneously, returning to the femoral artery and internal jugular vein respectively;

[0061] See also Figure 1 , V-AA mode: venous drainage (such as internal jugular vein or femoral vein) and arterial return, returning to the femoral artery and internal carotid artery respectively;

[0062] S2. After vascular access is complete, connect the drainage line, arterial return line, and venous return line to the system.

[0063] Specifically, the pipeline in the mother-and-child dual-pump ECMO power system is degassed and pre-filled, and the patient catheter and the terminal interface of the pipeline are fixedly connected;

[0064] More specifically, the entire ECMO circuit is degassed and pre-filled with heparinized saline or balanced salt solution to ensure that there are no bubbles in the system. The interface of the circuit in the mother-and-child dual-pump ECMO power system is fixedly connected to the patient's catheter to ensure consistent blood flow direction and clear markings.

[0065] S3. respectively start the mother pump 400 and the sub-pump 500, wherein the mother pump 400 is responsible for drainage and supply of the main circulating blood flow, generally started first, the sub-pump 500 for fine control of arterial return flow;

[0066] Manually adjust the pump speed (RPM) through the manual control panel 602 equipped with each pump body, and observe the real-time flow rate value (L / min) and pump speed readings on the control interface;

[0067] After step S3, the mother-child dual-pump ECMO power system can be flexibly switched to multiple modes, i.e., step S4;

[0068] The system supports switching from VV mode to V-AA or V-AV mode at any time during clinical practice without replacing the entire device. Mode switching specifically includes:

[0069] S41. Adjust pump speed;

[0070] S42. Turn on / off the corresponding circuit, wherein the branch 1 200 and the branch 2 300 are connected to the blood return main path 100 via a three-way switch;

[0071] S43. Start the sub-pump 500 and adjust it to the target flow rate, thereby achieving a smooth transition of modes.

[0072] S5. Real-time monitoring and manual adjustment;

[0073] During system operation, the flow rate values ​​of the two pumps are monitored through the built-in flow sensor, and the changes in pump speed and flow are observed through the control panel:

[0074] Medical staff can manually adjust the speed of the main pump 400 and the sub-pump 500 according to the patient's arterial pressure, mixed venous oxygen saturation (SvO2), lactate level, urine volume and other parameters;

[0075] When the upper body is underperfused (such as North-South syndrome) or the heart is overloaded, the sub-pump speed can be increased by 500 to improve brain perfusion or reduce the left ventricular burden;

[0076] Among them, if it is necessary to maintain VV, VA and other modes, only the main pump 400 needs to work alone, and the sub-pump 500 part can be ignored, which will not affect the overall operation.

[0077] S6. Shut down and remove the dual-pump ECMO power system

[0078] Before the patient is weaned from ECMO support, the following steps are involved:

[0079] S61. Gradually reduce the flow rate of the sub-pump 500 to minimum or turn it off;

[0080] S62. Slowly reduce the flow rate of the mother pump 400 to the minimum maintenance value;

[0081] S63. After observing that the patient's circulation is stable, disconnect the tube, remove the catheter, and apply pressure to stop bleeding.

[0082] This mother-and-child dual-pump ECMO power system is primarily used for critically ill patients, especially those with severe cardiopulmonary failure. When using hybrid ECMO modes such as V-AV, the system can precisely regulate blood flow in the arterial and venous circuits, reduce cardiac afterload pressure, and ensure systemic perfusion needs, thereby providing personalized treatment support. Suitable for patients recovering from cardiac surgery, those with acute respiratory failure, those undergoing cardiopulmonary resuscitation, and other critically ill patients requiring ECMO support, the system can optimize oxygenation, improve circulatory stability, and adjust treatment plans in real time based on the patient's different physiological states, thereby enhancing treatment efficacy and clinical prognosis.

[0083] Taking VA-ECMO as an example, the femoral artery is often used for blood return in VA-ECMO, and the patient's brain tissue, upper body, etc. cannot be effectively perfused. At this time, dual arterial lines can be added for return transfusion, and the common carotid artery return end can be added to increase upper body perfusion. The common carotid artery end blood pump can be added to precisely regulate the blood flow in the upper body, reduce the risk of high brain perfusion, and improve North-South syndrome. The mother-child dual-pump ECMO power system can establish dual pump heads on ECMO and precisely regulate the blood return flow to achieve the purpose of individualized treatment.

[0084] In summary, the mother-and-child dual-pump ECMO power system, through the use of a mother-and-child dual-pump design, achieves independent flow control of different circuits. It can adjust blood flow in real time according to the patient's physiological state and accurately control the oxygenation effect. Different circuits are equipped with pumps with precise flow regulation. The sub-pump 500 diverts arterial blood flow, which can reduce cardiac afterload and ensure effective blood drainage and perfusion. The venous circuit ensures continuous return, optimizes blood circulation, supports dual-arterial configuration, and alleviates the "North-South syndrome."

[0085] It not only improves the accuracy and stability of treatment, but also enables personalized adjustments based on the individual needs of different patients, thereby enhancing the effectiveness of ECMO treatment and improving the clinical prognosis of critically ill patients. By optimizing the dynamic performance of the ECMO system, this invention provides a more reliable and efficient solution for clinical treatment.

[0086] The embodiments described above are only used to illustrate the technical ideas and features of the present invention. Their purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. The scope of the patent application of the present invention cannot be limited by these embodiments alone. That is, any equivalent changes or modifications made according to the spirit disclosed by the present invention still fall within the patent scope of the present invention.

Claims

1. A mother-and-child dual-pump ECMO power system, characterized in that: include: A blood return main path (100), a branch path 1 (200) and a branch path 2 (300), wherein one end of the blood return main path (100) is a venous catheter end, and the other end of the blood return main path (100) is provided with the branch path 1 (200) and the branch path 2 (300) connected in parallel, wherein the branch path 1 (200) is an arterial branch, and the branch path 2 (300) is an arterial branch or a venous branch, the blood return main path (100) and the branch path 1 (200) are connected to form a loop 1, and the blood return main path (100) and the branch path 2 (300) are connected to form a loop 2; A mother pump (400) and a sub-pump (500), wherein the sub-pump (500) is provided on the first branch (200), and the mother pump (400) is provided on the main blood return path (100); A flow control component (600) and a real-time sensor are provided on both the first loop and the second loop. The real-time sensor is configured to obtain output flow data of the sub-pump (500) and the main pump (400). The real-time sensor is electrically connected to the flow control component (600). The flow control component (600) is preset with an arterial return ratio, which is equal to the ratio of the flow of the sub-pump (500) to the flow of the main pump (400). The flow control component (600) is configured to adjust the flow of the sub-pump (500) and the main pump (400) to maintain the arterial return ratio.

2. A mother-and-child dual-pump ECMO power system according to claim 1, characterized in that: The flow control assembly (600) further comprises: A controller (601) is electrically connected to the real-time sensor. The controller (601) controls the connection between the sub-pump (500) and the main pump (400) respectively. The controller (601) is provided with an adjustable arterial return ratio.

3. A mother-and-child dual-pump ECMO power system according to claim 2, characterized in that: The controller (601) is provided with a control panel (602), and the mother pump (400) and the sub-pump (500) are both provided with separate control panels (602).

4. A mother-and-child dual-pump ECMO power system according to claim 3, characterized in that: The control panel (602) is provided with a speed knob (6021), a pump speed display (6022) and an alarm indicator light.

5. A mother-and-child dual-pump ECMO power system according to claim 1, characterized in that: The sub-pump (500) is a high-precision magnetic pump.

6. A mother-and-child dual-pump ECMO power system according to claim 1, characterized in that: The flow control assembly (600) includes an electronic control valve, and the sub-pump (500) and the main pump (400) are both connected to the electronic control valve, and the controller (601) is connected to the electronic control valve.

7. A mother-and-child dual-pump ECMO power system according to claim 1, characterized in that: A membrane lung is installed on the blood return main path (100), and the membrane lung is located on the output end side of the mother pump (400); The real-time sensing component includes a mother pump flow sensor (701) and a sub-pump flow sensor (702), wherein the mother pump flow sensor (701) is arranged on the main blood return path (100) between the output end of the mother pump (400) and the membrane lung, and the sub-pump flow sensor (702) is arranged on one side of the output end of the sub-pump (500).

8. A flow control method based on the above-mentioned mother-and-child dual-pump ECMO power system, the flow control method comprising the following steps: Selecting a suitable ECMO support mode according to the patient's clinical condition and placing a tube on the patient, connecting the drainage line and the blood return line to the blood return main line (100), the branch line 1 (200) and the branch line 2 (300) in the parent-child dual-pump ECMO power system respectively; Starting the mother pump (400) and the daughter pump (500) in sequence; monitoring the output flow rates of the sub-pump (500) and the main pump (400), selecting the arterial return ratio according to the patient's physical parameters, and adjusting the output flow rates of the main pump (400) and the sub-pump (500) through the controller (601); Shut down and remove the mother-and-child dual-pump ECMO power system.

9. A flow control method according to claim 8, characterized in that: Shut down and remove the mother-and-child dual-pump ECMO power system. The specific steps include: Gradually reduce the flow rate of the sub-pump (500) to a minimum or shut it down; Gradually reducing the flow rate of the mother pump (400) to the minimum maintenance value; After observing that the patient's own circulation is stable, disconnect the pipeline of the mother-and-child dual-pump ECMO power system, remove the catheter, and apply pressure to stop bleeding.

10. A flow control method according to claim 8, characterized in that: After the mother pump (400) and the sub-pump (500) are started in sequence, multi-mode switching can be performed, and the multi-mode switching includes the following steps: adjusting the pump speed of the mother pump (400); Connect or close the corresponding circuit; The sub-pump (500) is turned on and adjusted to the target flow rate.

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