Ventilation adjustment method and high-frequency ventilation system

Abstract

A ventilation adjustment method and a high-frequency ventilation system are used to generate a stable small flow rate during high-frequency oscillation to ensure stable and accurate oxygen concentration control within the set range of oxygen concentration. Among them, the ventilation adjustment method includes: determining a first gas flow rate control value and a second gas flow rate control value according to the target output flow rate and the oxygen concentration set value; judging whether the first gas flow rate control value belongs to a first dead zone range and judging whether the second gas flow rate control value belongs to a second dead zone range; if the first gas flow rate control value belongs to the first dead zone range, the first gas flow rate controller (212) is kept open during the exhalation phase; if the second gas flow rate control value belongs to the second dead zone range, the second gas flow rate controller (222) is kept open during the exhalation phase.

Description

Technical Field

[0001] This application relates to the field of assisted respiration, and particularly to a ventilation adjustment method and a high-frequency ventilation system. Background Art

[0002] Mechanical ventilation, as an important respiratory support technology, has been widely applied in clinical treatment. Mechanical ventilation is divided into conventional mechanical ventilation (CMV) and high-frequency oscillatory ventilation (HFV) according to the ventilation frequency. Currently, the main ventilation treatment method in clinical practice is still conventional mechanical ventilation, which plays an important role in correcting severe hypoxemia, hypercapnia, and relieving the fatigue of the high-frequency ventilation system. In recent years, with the update and improvement of the high-frequency ventilation treatment technology, high-frequency ventilation has become an important supplement to conventional mechanical ventilation and is also playing an increasingly important role.

[0003] High-frequency ventilation systems can be divided into two types according to the implementation principle, one is the diaphragm or piston type, and the other is the valve-controlled type. Both implementation methods can generate high-frequency pressure oscillations, but the control pressure of the valve-controlled high-frequency ventilation system can reach different ranges according to the proportional valve range selection, the system oscillation ability is stronger, and the applicable range is also wider.

[0004] For valve-controlled high-frequency ventilation, a pulsed gas flow needs to be generated by quickly opening and closing the valve to achieve the desired high-frequency oscillation pressure; in addition, the oxygen concentration of the high-frequency ventilation system is also controlled by the flow rate of the proportional valve.

[0005] However, due to the viscous characteristics of the proportional valve, there is a dead zone near the small flow rate of the proportional valve. The common ventilation frequency of high-frequency ventilation is as high as 300 - 1200 times / min. During the pressure oscillation process, the flow rate of the proportional valve needs to be quickly controlled. If the conventional control method is used during high-frequency ventilation, the proportional valve cannot continuously open a stable flow rate near the dead zone. As a result, when the oxygen concentration is set below 40% or above 80%, the oxygen concentration will fluctuate. Summary of the Invention

[0006] The embodiments of this application provide a ventilation adjustment method and a high-frequency ventilation system for generating a stable small flow rate during high-frequency oscillation to ensure stable and accurate oxygen concentration control within the set oxygen concentration range.

[0007] A first aspect of an embodiment of the present application provides a ventilation adjustment method, which is applied to a high-frequency ventilation system. The high-frequency ventilation system includes: a gas source interface, an inhalation branch, a ventilation control device, and a high-frequency pressure drop module. The inhalation branch includes a first gas branch, a second gas branch, and a mixing branch. A first gas flow rate controller capable of generating a high-frequency pulsed flow rate is provided in the first gas branch, and a second gas flow rate controller capable of generating a high-frequency pulsed flow rate is provided in the second gas branch. The method is characterized by including:

[0008] Determine a first gas flow rate control value and a second gas flow rate control value according to a target output flow rate and an oxygen concentration setting value;

[0009] Judge whether the first gas flow rate control value belongs to a first dead zone range and whether the second gas flow rate control value belongs to a second dead zone range;

[0010] If the first gas flow rate control value belongs to the first dead zone range, keep the first gas flow rate controller on;

[0011] If the second gas flow rate control value belongs to the second dead zone range, keep the second gas flow rate controller on;

[0012] The first dead zone range corresponds to the dead zone range of the first gas flow rate controller, and the second dead zone range corresponds to the dead zone range of the second gas flow rate controller.

[0013] Optionally, the method further includes:

[0014] If the first gas flow rate control value belongs to the first dead zone range and the second gas flow rate control value does not belong to the second dead zone range, control the second gas flow rate controller to generate a high-frequency oscillation;

[0015] If the first gas flow rate control value does not belong to the first dead zone range and the second gas flow rate control value belongs to the second dead zone range, control the first gas flow rate controller to generate a high-frequency oscillation.

[0016] Optionally, the method further includes:

[0017] If the first gas flow rate control value belongs to the first dead zone range and the second gas flow rate control value belongs to the second dead zone range, control the high-frequency pressure drop module to generate a high-frequency oscillation.

[0018] Optionally, the high-frequency pressure drop module includes a high-frequency valve and a turbine.

[0019] Optionally, controlling the high-frequency pressure drop module to generate a high-frequency oscillation includes:

[0020] Control the high-frequency valve and the turbine according to a preset high-frequency oscillation frequency to cause high-frequency oscillation of the gas.

[0021] Optionally, the method further includes:

[0022] If the first gas flow rate control value does not belong to the first dead zone range and the second gas flow rate control value does not belong to the second dead zone range, control the first gas flow rate controller and the second gas flow rate controller to generate a high-frequency pulsed flow rate.

[0023] Optionally, an oxygen concentration detector for detecting the oxygen concentration of the gas output from the suction branch is further provided in the suction branch;

[0024] If the oxygen concentration of the output gas detected by the oxygen concentration detector does not reach the target oxygen concentration, adjust the first gas flow rate controller and the second gas flow rate controller according to the oxygen concentration of the output gas and the target oxygen concentration.

[0025] Optionally, adjusting the first gas flow rate controller and the second gas flow rate controller according to the oxygen concentration of the output gas and the target oxygen concentration includes:

[0026] Based on a preset adjustment rule, adjust the first gas flow rate controller and the second gas flow rate controller according to the oxygen concentration of the output gas and the target oxygen concentration.

[0027] Optionally, the method further includes:

[0028] Determine the first dead zone range according to the flow rate-current curve of the first gas flow rate controller;

[0029] Determine the second dead zone range according to the flow rate-current curve of the second gas flow rate controller.

[0030] Optionally, the method further includes:

[0031] Obtain the flow rate-current curve of the first gas flow rate controller and the flow rate-current curve of the second gas flow rate controller.

[0032] A second aspect of the present application provides a high-frequency ventilation system, which includes a gas source interface, a suction branch, a ventilation control device, and a high-frequency pressure drop module. The suction branch includes a first gas branch, a second gas branch, and a mixing branch. A first gas flow rate controller capable of generating a high-frequency pulsed flow rate is provided in the first gas branch, and a second gas flow rate controller capable of generating a high-frequency pulsed flow rate is provided in the second gas branch. The ventilation control device is used for:

[0033] Determine the first gas flow rate control value and the second gas flow rate control value according to the target output flow rate and the set value of oxygen concentration;

[0034] Judge whether the first gas flow rate control value belongs to the first dead zone range and whether the second gas flow rate control value belongs to the second dead zone range;

[0035] If the first gas flow rate control value belongs to the first dead zone range, keep the first gas flow rate controller on;

[0036] If the second gas flow rate control value belongs to the second dead zone range, keep the second gas flow rate controller on;

[0037] The first dead zone range corresponds to the dead zone range of the first gas flow rate controller, and the second dead zone range corresponds to the dead zone range of the second gas flow rate controller.

[0038] Optionally, the ventilation control device is further configured to:

[0039] If the first gas flow rate control value belongs to the first dead zone range and the second gas flow rate control value does not belong to the second dead zone range, control the second gas flow rate controller to generate high-frequency oscillation;

[0040] If the first gas flow rate control value does not belong to the first dead zone range and the second gas flow rate control value belongs to the second dead zone range, control the first gas flow rate controller to generate high-frequency oscillation.

[0041] Optionally, the ventilation control device is further configured to:

[0042] If the first gas flow rate control value belongs to the first dead zone range and the second gas flow rate control value belongs to the second dead zone range, control the high-frequency pressure drop module to generate high-frequency oscillation.

[0043] Optionally, the high-frequency pressure drop module includes a high-frequency valve and a turbine.

[0044] Optionally, the ventilation control device controls the high-frequency pressure drop module to generate high-frequency oscillation, including:

[0045] According to the preset high-frequency oscillation frequency, control the high-frequency valve and the turbine to make the gas generate high-frequency oscillation.

[0046] Optionally, the ventilation control device is further configured to:

[0047] If the first gas flow rate control value does not belong to the first dead zone range and the second gas flow rate control value does not belong to the second dead zone range, control the first gas flow rate controller and the second gas flow rate controller to generate high-frequency pulsed flow rates.

[0048] Optionally, an oxygen concentration detector for detecting the oxygen concentration of the gas output from the suction branch is further provided in the suction branch, and the ventilation control device is further configured to:

[0049] If the oxygen concentration of the output gas detected by the oxygen concentration detector does not reach the target oxygen concentration, the first gas flow rate controller and the second gas flow rate controller are adjusted according to the oxygen concentration of the output gas and the target oxygen concentration.

[0050] Optionally, the ventilation control device adjusting the first gas flow rate controller and the second gas flow rate controller according to the oxygen concentration of the output gas and the target oxygen concentration includes:

[0051] Based on a preset adjustment rule, the first gas flow rate controller and the second gas flow rate controller are adjusted according to the oxygen concentration of the output gas and the target oxygen concentration.

[0052] Optionally, the ventilation control device is further configured to:

[0053] Determine the first dead zone range according to the flow rate-current curve of the first gas flow rate controller;

[0054] Determine the second dead zone range according to the flow rate-current curve of the second gas flow rate controller.

[0055] Optionally, the ventilation control device is further configured to:

[0056] Obtain the flow rate-current curve of the first gas flow rate controller and the flow rate-current curve of the second gas flow rate controller.

[0057] A third aspect of the embodiments of the present application provides a computer-readable storage medium, in which instructions are stored, and when it runs on a computer, the computer is made to execute the ventilation adjustment method provided in the first aspect above.

[0058] In summary, it can be seen that in the embodiments provided in the present application, the first gas flow rate control value and the second gas flow rate control value are determined according to the target output flow rate and the oxygen concentration setting value, and it is respectively determined whether the first gas flow rate control value belongs to the first dead zone range and whether the second gas flow rate control value belongs to the second dead zone range; if the first gas flow rate control value belongs to the first dead zone range, the first gas flow rate controller is kept on during the exhalation phase, and if the second gas flow rate control value belongs to the second dead zone range, the second gas flow rate controller is kept on during the exhalation phase. In this way, when the flow rate of the proportional valve is within its corresponding dead zone range, by adjusting the flow rate of the proportional valve, a stable small flow rate can be generated during high-frequency oscillation, ensuring stable and accurate oxygen concentration control within the oxygen concentration setting range. Description of the Drawings

[0059] Figure 1 FIG. 1 is a schematic structural diagram of a high-frequency ventilation system provided by an embodiment of the present application;

[0060] Figure 2 FIG. 2 is another schematic structural diagram of a high-frequency ventilation system provided by an embodiment of the present application;

[0061] Figure 3 FIG. 3 is a schematic diagram of the control effect of using a conventional oxygen mixing control algorithm provided by an embodiment of the present application;

[0062] Figure 4 FIG. 4 is a schematic diagram of the control effect of a ventilation adjustment method provided by an embodiment of the present application;

[0063] Figure 5 FIG. 5 is a schematic diagram of the dead zone flow rate control and non-dead zone flow rate control of a proportional valve provided by an embodiment of the present application;

[0064] Figure 6 FIG. 6 is a schematic flow chart of a ventilation adjustment method provided by an embodiment of the present application;

[0065] Figure 7 FIG. 7 is a schematic virtual structure diagram of a high-frequency ventilation system provided by an embodiment of the present application. Detailed Embodiments

[0066] The terms "first", "second", "third", "fourth", etc. (if any) in the specification, claims and drawings of the present application are used to distinguish similar objects and do not necessarily describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments described herein can be implemented in an order different from that shown or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0067] Figure 1 FIG. 1 is a schematic structural diagram of a high-frequency ventilation system provided by an embodiment of the present application, Figure 2 FIG. 2 is another schematic structural diagram of a high-frequency ventilation system provided by an embodiment of the present application. As Figure 1 and Figure 2 shown, the high-frequency ventilation system mainly includes: a gas source interface 1, an inhalation branch 2, a ventilation control device 3 (not shown in the figure), and a high-frequency pressure drop module 4;

[0068] The intake branch 2 is respectively connected to the gas source interface 1 and the patient pipeline connected to the user's respiratory system;

[0069] The ventilation control device 3 is connected to the intake branch 2 and the high-frequency pressure drop module 4. During the inhalation phase, it controls the gas in the intake branch 2 to generate high-frequency oscillations and outputs the generated high-frequency oscillating gas through the intake branch 2 and the patient pipeline; during the exhalation phase, the high-frequency pressure drop module 4 actively extracts the gas exhaled by the user through the patient pipeline.

[0070] It should be noted that in the embodiments of the present application, the intake branch 2 of the high-frequency ventilation system is used to provide a gas transmission path during the inhalation phase.

[0071] It should be noted that in the embodiments of the present application, such as Figure 1 and Figure 2 shown, the high-frequency pressure drop module 4 can include a high-frequency valve 41 and a turbine 42 to generate high-frequency oscillations in the exhaled gas of the patient. Specifically, the high-frequency valve 41 can be any one of a proportional solenoid valve, a blocking valve, and a servo valve, and no specific limitation is made. The high-frequency pressure drop module 4 can also generate high-frequency oscillations by the first gas flow rate controller 212 and the second gas flow rate controller 222 during the inhalation phase, and can be specifically adjusted according to the actual situation. During the exhalation phase, the ventilation control device 3 controls the high-frequency pressure drop module 4 to actively extract the exhaled gas of the user according to a preset high-frequency oscillation frequency to achieve active exhalation.

[0072] It should be noted that in the embodiments of the present application, medical staff can determine the preset high-frequency oscillation frequency according to the actual ventilation needs of the user. Specifically, the preset high-frequency oscillation frequency can be 3 - 50 Hz. Of course, it can also be set according to the actual situation of the user, and no specific limitation is made.

[0073] In addition, it can be understood that a third pressure sensor 6 can also be provided on the pipeline connected to the target object. The third pressure sensor 6 is connected to the output end of the intake branch 2 and the input end of the exhalation branch 5.

[0074] It can be understood that in the embodiments of the present application, the high-frequency ventilation system further includes an exhalation branch 5, and the exhalation branch 5 is used to provide an exhalation path during the exhalation phase.

[0075] It should be noted that in the embodiments of the present application, the high-frequency pressure drop module 4 includes a high-frequency valve 41 and / or an electric gas extraction device 42. Among them, the high-frequency valve 41 can be any one of a proportional solenoid valve, a blocking valve, and a servo valve, and the electric gas extraction device 42 can be a device such as a turbine. In the exhalation stage, the ventilation control device 3 can control the turbine to rotate based on a preset high-frequency oscillation frequency. By controlling the rotation speed of the turbine, the negative force can be controlled to generate active exhalation. The user's exhaled gas actively extracted by the turbine generates active exhalation. Specifically, the high-frequency valve 41 and the electric gas extraction device 42 can be selected according to actual situations, and the embodiments of the present application do not make limitations.

[0076] In the embodiments of the present application, as Figure 1 shown, the high-frequency pressure drop module 4 can be arranged on the exhalation branch 5 of the high-frequency ventilation system. As Figure 2 shown, the high-frequency pressure drop module 4 can also be arranged on the inhalation branch 2 of the high-frequency ventilation system. In addition, as Figure 1 and Figure 2 shown, the high-frequency pressure drop module 4 not only includes the high-frequency valve 41 and the electric gas extraction device 42, but also includes an exhalation filter 43. In the exhalation stage, the ventilation control device 3 can control the high-frequency valve 41 to open and control the electric gas extraction device 42, such as the rotation speed of the turbine, by adjusting the current or voltage, so as to extract the user's exhaled gas through the exhalation filter 43. In addition, in the exhalation stage, the ventilation control device 3 can also control the exhalation valve of the exhalation branch 5 to open and exhaust at the same time, so as to assist the electric gas extraction device 42 to exhaust together.

[0077] It should be noted that in the embodiments of the present application, for different actual situations, active exhalation can be achieved only by opening the high-frequency valve 41, or only by using the electric gas extraction device 42, or by using both the high-frequency valve 41 and the electric gas extraction device 42 at the same time. The embodiments of the present application do not make limitations. For the sake of easy understanding, the following takes the electric gas extraction device 42 as a turbine as an example for illustration.

[0078] It should be noted that in the embodiments of the present application, as Figure 1 and Figure 2 shown, the exhalation branch 5 can include an exhalation flow sensor 51, an exhalation valve 52, and an exhalation check valve 53. Among them, the exhalation flow sensor 51 is connected to the patient pipeline and is used to monitor the flow rate and tidal volume of the user's exhaled gas. The exhalation valve 52 is connected to the exhalation flow sensor 51 and is used to control the end-expiratory pressure of the user's exhaled gas to prevent the alveoli from collapsing after the user exhales. The exhalation check valve 53 is connected to the exhalation valve 52 and is used to prevent gas from entering from the exhalation branch.

[0079] It should be noted that in the embodiments of the present application, during the exhalation phase, when constant-frequency ventilation is adopted, the ventilation control device 3 controls the high-frequency valve 41 to close, and the user's exhaled gas passes through the exhalation flow sensor 51 of the exhalation branch 5 and is discharged through the exhalation valve 52.

[0080] It can be understood that in the embodiments of the present application, the actual state of the user may not require active exhalation during the exhalation phase. Therefore, the ventilation control device 3 can also control the active exhalation device 5 to close during the exhalation phase, so that the gas exhaled by the user from the patient pipeline can be discharged through the exhalation branch 5.

[0081] In the embodiments of the present application, as Figure 1 and Figure 2 shown, the gas source interface 1 includes a first gas source interface 11 and a second gas source interface 12, and the inhalation branch 2 includes: a first gas branch 21, a second gas branch 22, and a mixing branch 23.

[0082] The outlet end of the first gas branch 21 and the outlet end of the second gas branch 22 are respectively connected to the inlet end of the mixing branch 23.

[0083] The outlet end of the mixing branch 23 is connected to the patient pipeline.

[0084] The inlet end of the first gas branch 21 is connected to the first gas source interface 11.

[0085] The inlet end of the second gas branch 22 is connected to the second gas source interface 12.

[0086] It should be noted that in the embodiments of the present application, as Figure 1 and Figure 2 shown, the first gas source interface 11 is used to connect to an oxygen gas source, and the second gas source interface 12 is used to connect to an air gas source. Of course, it is also possible to use the first gas source interface 11 to connect to an air gas source, and correspondingly, use the second gas source interface 12 to connect to an oxygen gas source. The embodiments of the present application do not make any limitations.

[0087] Specifically, in the embodiments of the present application, as Figure 1 and Figure 2 shown, the first gas branch 21 includes a first inhalation one-way valve 211 and a first gas flow rate controller 212 connected in sequence, the second gas branch 22 includes a second inhalation one-way valve 221 and a second gas flow rate controller 222 connected in sequence, and the mixing branch 23 includes a third inhalation one-way valve 231 connected in sequence to the first gas branch 21 and the second gas branch 22.

[0088] The first inhalation one-way valve 211 is connected to the first gas source interface 11, and the second inhalation one-way valve 221 is connected to the second gas source interface 12.

[0089] The first gas flow rate controller 212 and the second gas flow rate controller 222 are respectively connected to the ventilation control device 3.

[0090] It should be noted that, in the embodiments of the present application, as Figure 1 and Figure 2 shown, in the first gas branch 21, it may not only include the first inhalation one-way valve 211 and the first gas flow rate controller 212, but also include the first filter 213, the first pressure sensor 214, the first pressure regulating valve 215, the second filter 216 and the first flow sensor 217. In addition, in the second gas branch, it may not only include the second inhalation one-way valve 221 and the second gas flow rate controller 222, but also include the third filter 223, the second pressure sensor 224, the second pressure regulating valve 225, the fourth filter 226 and the second flow sensor 227.

[0091] Specifically, in the embodiments of the present application, as Figure 1 and Figure 2 shown, in the first gas branch 21, the first filter 213 is connected to the first gas source interface 11 to prevent impurities from flowing into the downstream of the gas path and protect the downstream devices. The first pressure sensor 214 is connected to the first filter 213 and is used to monitor the pressure of the oxygen input by the first gas source interface 11, so as to realize an alarm prompt when the pressure exceeds the maximum threshold or is lower than the minimum threshold. The first inhalation one-way valve 211 is connected to the first pressure sensor 214 to prevent air from entering the branch, and, when only the second gas branch 22 is opened, it can avoid the reverse leakage of the air entering the second gas branch 22. The first pressure regulating valve 215 is connected to the first inhalation one-way valve 211 and can stabilize the pressure of the gas source input to ensure the accurate control of the downstream flow rate and pressure. The first gas flow rate controller 212 is connected to the first pressure regulating valve 215 and is used to adjust and control the flow rate of oxygen. The second filter 216 is connected to the first gas flow rate controller 212 and the first flow sensor 217. The second filter is used to further purify the input oxygen, protect the accurate measurement of the first flow sensor 217 for the smooth flow of oxygen downstream, and can also play a role in stabilizing the flow rate.

[0092] Specifically, in the embodiments of the present application, as Figure 1 and Figure 2As shown in the figure, in the second gas branch 22, the third filter 223 is connected to the second gas source interface 12 to prevent impurities from flowing into the downstream of the gas path and protect the downstream devices. The second pressure sensor 224 is connected to the third filter 223 and is used to monitor the pressure of the air input at the second gas source interface 12, so as to give an alarm prompt when the pressure exceeds the maximum threshold or is lower than the minimum threshold. The second suction check valve 221 is connected to the second pressure sensor 224 to prevent oxygen from entering the branch. Moreover, when only the first gas branch 21 is opened, it can prevent the oxygen entering the first gas branch 21 from leaking back. The second pressure regulating valve 225 is connected to the second suction check valve 221 and can stabilize the pressure of the gas source input to ensure accurate control of the downstream flow rate and pressure. The second gas flow rate controller 222 is connected to the second pressure regulating valve 225 and is used to adjust and control the air flow rate. The fourth filter 226 is connected to the second gas flow rate controller 222 and the second flow sensor 227. The fourth filter 226 is used to further purify the input air, protect the accurate measurement of the oxygen flow rate by the downstream second flow sensor 227, and can also play a role in stabilizing the flow rate.

[0093] It can be understood that in the embodiments of the present application, the first gas flow rate controller 212 and the second gas flow rate controller 222 respectively control the flow rates of oxygen and air. Thus, when oxygen and air are mixed in the mixing branch 23 to obtain a mixed gas, the oxygen concentration in the mixed gas can be controlled to meet the ventilation requirements of different users.

[0094] It should be noted that in the embodiments of the present application, as Figure 1 and Figure 2 shown, the mixing branch 23 not only includes the third suction check valve 231, but may also include a safety valve 232 and a humidifier 233.

[0095] Please refer to Figure 3 , Figure 3 which is a schematic diagram of the control effect of the conventional oxygen mixing control algorithm provided by the embodiments of the present application. Among them, when the target oxygen concentration is set to 30% during the high-frequency ventilation process, due to the dead zone characteristic of the air proportioning valve, the flow rate control cannot be stabilized, resulting in a fluctuation of about 13% in the actual oxygen concentration at the patient end, exceeding the oxygen concentration accuracy requirement of clinical practice (the clinically commonly used accuracy range is 3%). Refer to Figure 3 for 301 to 301, 301 is the schematic diagram of the air flow rate corresponding to 30% oxygen concentration, 302 is the schematic diagram of the oxygen flow rate corresponding to 30% oxygen concentration, and 303 is the schematic diagram of the fluctuation of the actual oxygen concentration corresponding to 30% oxygen concentration. Whether it is the air flow rate corresponding to 30% oxygen concentration, the oxygen flow rate corresponding to 30% oxygen concentration, or the actual oxygen concentration corresponding to 30% oxygen concentration, different degrees of fluctuations occur.

[0096] Please refer toFigure 4 , Figure 4 This is a schematic diagram of the control effect provided by the embodiment of the present application using the ventilation adjustment method provided by the present application. For the small-flow oxygen mixing fluctuation caused by the dead zone of the proportional valve in the high-frequency ventilation mode, when a proportional valve is within its corresponding dead zone range, the ventilation adjustment method in the present application keeps the proportional valve open, ensuring a stable small flow rate during high-frequency oscillation, ensuring stable and accurate oxygen concentration control within the oxygen concentration setting ranges of 21%-40% and 80%-100%, and ensuring that the oxygen concentration control accuracy is within 3%. Refer to Figure 4 , Figure 4 In [reference], 401 is the schematic diagram of the air flow rate corresponding to 30% oxygen concentration, 402 is the schematic diagram of the oxygen flow rate corresponding to 30% oxygen concentration, and 403 is the schematic diagram of the fluctuation of the actual oxygen concentration corresponding to 30% oxygen concentration. It can be seen from Figure 4 that by adjusting the proportional valve through the ventilation adjustment method of the present application, whether it is the air flow rate corresponding to 30% oxygen concentration, the oxygen flow rate corresponding to 30% oxygen concentration, or the actual oxygen concentration corresponding to 30% oxygen concentration, relatively stable oxygen flow rate, air flow rate, and actual oxygen concentration can be obtained.

[0097] As Figure 5 shown, when the oxygen concentration is set near 21% and 100%, the air proportional valve ( Figure 1 and Figure 2 the second gas flow rate controller in [reference]) or the oxygen proportional valve ( Figure 1 and Figure 2 the first gas flow rate controller in [reference]) cannot output a stable small target flow rate, showing a periodic sudden opening and closing phenomenon, and the unstable control of the flow rate ultimately leads to fluctuations in the oxygen concentration. In fact, the periodic opening and closing of the proportional valve are caused by the dead zone of the proportional valve. Within the dead zone range, the response of the proportional valve is non-linear, showing a phenomenon of rising and falling suddenly. During the high-frequency ventilation process, when the oxygen concentration is set near 21% or 100%, there must be a proportional valve that needs to output a relatively small control flow rate. When the small flow rate is adjusted according to the oxygen concentration feedback, when the flow rate is adjusted to near the dead zone or within the dead zone, due to the non-linear influence of the valve dead zone, it suddenly closes; theoretically, after the valve suddenly closes, under the action of the oxygen concentration feedback adjustment, the proportional valve will gradually open again. Due to the influence of the dead zone, the opening flow rate of the proportional valve is also discontinuous, showing a sudden opening of the flow rate. It is precisely the sudden opening and closing of the valve during small flow rate control that lead to fluctuations in the oxygen concentration. In fact, viscosity and dead zone are the inherent characteristics of the proportional valve, and it is impossible to fundamentally eliminate them in control. Only a certain compensation can be carried out to weaken the influence of the dead zone on the proportional valve control. However, for high-frequency ventilation, the control frequency is as high as 300-1200 times / min, and it is difficult to compensate for the dead zone of the proportional valve during a short control cycle, resulting in a more obvious dead zone characteristic of the valve.

[0098] In view of this, the present application provides a ventilation adjustment method. During high-frequency ventilation, when the air proportion valve or oxygen proportion valve is adjusted within the dead zone range during the inhalation phase, the valve closing operation is not performed during the exhalation phase, and the current control flow rate is maintained to avoid the influence of the dead zone of the proportion valve on the small flow rate control, and to ensure a relatively stable oxygen flow rate, air flow rate, and relatively stable oxygen concentration.

[0099] The following Figure 6 is used to illustrate the ventilation adjustment method provided by the embodiments of the present application.

[0100] Please refer to Figure 6 , Figure 6 , which is a schematic flow chart of the ventilation adjustment method provided by the embodiments of the present application. This ventilation adjustment method is applied to a high-frequency ventilation system. The high-frequency ventilation system includes: a gas source interface, an inhalation branch, a ventilation control device, and a high-frequency pressure drop module. The inhalation branch includes a first gas branch, a second gas branch, and a mixing branch. A first gas flow rate controller capable of generating a high-frequency pulsed flow rate is provided in the first gas branch, and a second gas flow rate controller capable of generating a high-frequency pulsed flow rate is provided in the second gas branch. The ventilation adjustment method includes:

[0101] 601. Determine a first gas flow rate control value and a second gas flow rate control value according to a target output flow rate and an oxygen concentration setting value.

[0102] In this embodiment, the ventilation control device can determine the first gas flow rate control value and the second gas flow rate control value according to the target output flow rate and the oxygen concentration setting value. That is, the first gas flow rate control value and the second gas flow rate control value can be set according to the target output flow rate set by the user and the oxygen concentration setting value that the user wants to obtain, in order to Figure 1 and Figure 2 take

[0103] 602. Determine whether the first gas flow rate control value belongs to a first dead zone range and determine whether the second gas flow rate control value belongs to a second dead zone range.

[0104] In this embodiment, after obtaining the first gas flow rate control value and the second gas flow rate control value, the ventilation control device can respectively determine whether the first gas flow rate control value belongs to the first dead zone range and whether the second gas flow rate control value belongs to the second dead zone range. Herein, the first dead zone range corresponds to the dead zone range of the first gas flow rate controller, and the second dead zone range corresponds to the dead zone range of the second gas flow rate controller. That is to say, the first dead zone range is the dead zone range of the first gas flow rate controller, and the second dead zone range is the dead zone range of the second gas flow rate controller.

[0105] It should be noted that when determining whether the first gas flow rate control value belongs to the first dead zone range and whether the second gas flow rate control value belongs to the second dead zone range, the judgment results are divided into three cases:

[0106] I. The first gas flow rate control value belongs to the first dead zone range;

[0107] II. The second gas flow rate control value belongs to the second dead zone range;

[0108] III. The first gas flow rate control value does not belong to the first dead zone range, and the second gas flow rate control value does not belong to the second dead zone range;

[0109] When the first gas flow rate control belongs to the first dead zone range, step 603 is executed; when the second gas flow rate control belongs to the second dead zone range, step 604 is executed; when the first gas flow rate control value does not belong to the first dead zone range and the second gas flow rate control value does not belong to the second dead zone range, step 605 is executed.

[0110] It should be noted that before determining whether the first gas flow rate control value belongs to the first dead zone range and whether the second gas flow rate control value belongs to the second dead zone range, it is necessary to first determine the first dead zone range corresponding to the first gas flow rate controller 212 and the second dead zone range corresponding to the second gas flow rate controller 222 respectively. The following is a specific description:

[0111] In one embodiment, the ventilation control device can obtain the flow rate-current curve of the first gas flow rate controller and the flow rate-current curve of the second gas flow rate controller, and then determine the first dead zone range according to the flow rate-current curve of the first gas flow rate controller; determine the second dead zone range according to the flow rate-current curve of the second gas flow rate controller.

[0112] In this embodiment, the flow rate-current curve of the first gas flow rate controller can be obtained by calibrating the flow rate of the first gas flow rate controller, or by referring to the performance manual provided by the manufacturer corresponding to the first gas flow rate controller. The first dead zone range can be set as the dead zone of the first gas flow rate controller and the flow rate at the inflection point of the linear part. Of course, it can also be set according to the actual situation of the device. The method for obtaining the corresponding second dead zone range of the second gas flow rate controller is the same.

[0113] 603. If the first gas flow rate control value belongs to the first dead zone range, keep the first gas flow rate controller on.

[0114] In this embodiment, when the first gas flow rate control value belongs to the first dead zone range, keep the first gas flow rate controller on. Here, it may include keeping the first gas flow rate controller on during both the inhalation phase and / or the exhalation phase.

[0115] It can be understood that when the first gas flow rate control value belongs to the first dead zone range, it also includes two cases. The first case is that the first gas flow rate control value belongs to the first dead zone range and the second gas flow rate control value does not belong to the second dead zone range; the second case is that the first gas flow rate control value belongs to the first dead zone range and the second gas flow rate control belongs to the second dead zone range. The following is an explanation of the two cases respectively:

[0116] 1. The first gas flow rate control value belongs to the first dead zone range, and the second gas flow rate control value does not belong to the second dead zone range.

[0117] If the first gas flow rate control value belongs to the first dead zone range and the second gas flow rate control value does not belong to the second dead zone range, then control the second gas flow rate controller to generate high-frequency oscillation.

[0118] 2. The first gas flow rate control belongs to the first dead zone range, and the second gas flow rate control value also belongs to the second dead zone range.

[0119] If the first gas flow rate control value belongs to the first dead zone range and the second gas flow rate control value belongs to the second dead zone range, then control the high-frequency pressure drop module to generate high-frequency oscillation. At this time, it may also include keeping the second gas flow rate controller on during both the inhalation phase and / or the exhalation phase. Combining Figure 1 and Figure 2 for explanation, refer to Figure 1 and Figure 2 , the ventilation control device 3 can control the high-frequency pressure drop module 4 to adjust according to the preset high-frequency oscillation frequency, so that the gas in the inhalation branch or the exhalation branch generates high-frequency oscillation, that is, by adjusting the high-frequency valve 41 and the turbine 42, the gas in the inhalation branch or the exhalation branch generates high-frequency oscillation.

[0120] It should be noted that the high-frequency pressure drop module includes a high-frequency valve and a turbine. Refer to Figure 1 and Figure 2 As can be seen, the high-frequency pressure drop module 4 includes a high-frequency valve 41 and a turbine 42. Specifically, the high-frequency valve 41 can be any one of a proportional solenoid valve, a blocking valve, and a servo valve.

[0121] 604. If the second gas flow rate control value belongs to the second dead zone range, keep the second gas flow rate controller on.

[0122] In this embodiment, when the second gas flow rate control value belongs to the second dead zone range, keep the second gas flow rate control on. Similarly, it can include keeping the second gas flow rate controller on during both the inhalation phase and / or the exhalation phase.

[0123] It should be noted that when the second gas flow rate control value belongs to the second dead zone range, the comparison result between the first gas flow rate control value and the first dead zone range includes two cases: 1. The first gas flow rate control value belongs to the first dead zone range; 2. The first gas flow rate control value does not belong to the first dead zone range. The following will be described separately:

[0124] 1. The second gas flow rate control value belongs to the second dead zone range, and the first gas flow rate control value belongs to the first dead zone range.

[0125] The implementation in the above step 603 when the second gas flow rate control value belongs to the second dead zone range and the first gas flow rate control value belongs to the first dead zone range has been described, and will not be elaborated here specifically.

[0126] 2. The first gas flow rate control value belongs to the second dead zone range, and the first gas flow rate control value does not belong to the first dead zone range.

[0127] When the first gas flow rate control value does not belong to the first dead zone range and the second gas flow rate control value belongs to the second dead zone range, control the first gas flow rate controller to generate high-frequency oscillation. That is to say, during the comparison of the first gas flow rate control value with the first dead zone range and the second gas flow rate control value with the second dead zone range, when one of the gas flow rate control values belongs to its corresponding dead zone range and the other gas flow rate control value does not belong to its corresponding dead zone range, control the gas flow rate controller corresponding to the gas flow rate control value that does not belong to the dead zone range to generate high-frequency oscillation. That is, when the target flow rate of the first gas flow rate controller 212 or the second gas flow rate controller 222 is adjusted to its corresponding dead zone range, the valve closing is no longer performed during both the inhalation phase and / or the exhalation phase, and the control flow rate is maintained.

[0128] 605. If the first gas flow rate control value does not belong to the first dead zone range and the second gas flow rate control value does not belong to the second dead zone range, other operations are performed.

[0129] In this embodiment, if the first gas flow rate control value does not belong to the first dead zone range and the second gas flow rate control value does not belong to the second dead zone range, the first gas flow rate controller and the second gas flow rate controller are controlled to generate a high-frequency pulsed flow rate. That is to say, when both gas flow rate control values do not belong to their corresponding dead zone ranges, the first gas flow rate controller and the second gas flow rate controller are respectively controlled to be turned on and off in a high-frequency pulsed manner (that is, controlling the first gas flow rate controller and the second gas flow rate controller to continuously turn on and off), forming a high-frequency pulsed flow rate to enhance the high-frequency oscillation of the inhalation branch 2. In addition, when the first gas flow rate control value does not belong to the first dead zone range and the second gas flow rate controller does not belong to the second dead zone range, high-frequency oscillation can also be generated through the high-frequency pressure drop module, and the specific details are not limited.

[0130] It should be noted that the high-frequency pressure drop module is adjusted according to the control requirements of negative pressure. The high-frequency oscillation is jointly completed by the pulsed airflows formed in the exhalation stage and the inhalation stage. The high-frequency pressure drop module can assist in reducing pressure throughout the inhalation stage and the exhalation stage. Especially during the process of generating negative pressure, whether in the exhalation stage or the inhalation stage, high-frequency oscillation can be generated by controlling the high-frequency pressure drop module.

[0131] In one embodiment, an oxygen concentration detector for detecting the oxygen concentration of the gas output from the inhalation branch is further provided in the inhalation branch;

[0132] If the oxygen concentration of the output gas detected by the oxygen concentration detector does not reach the target oxygen concentration, the first gas flow rate controller and the second gas flow rate controller are adjusted according to the oxygen concentration of the output gas and the target oxygen concentration.

[0133] Combined Figure 1 and Figure 2 For illustration, the oxygen concentration detector can be arranged between the humidifier and the third pressure sensor 7 in the mixing branch 23 of the inhalation branch 2, so as to detect whether the oxygen concentration of the gas output from the entire inhalation branch 2 reaches the target oxygen concentration. When the oxygen concentration of the output gas of the inhalation branch 2 does not reach the target oxygen concentration, the flow rates of the first gas flow rate controller and the second gas flow rate controller are adjusted according to the oxygen concentration of the output gas and the target oxygen concentration. For example, the flow rates of the first gas flow rate controller and the second gas flow rate controller are increased or decreased according to the oxygen concentration of the output gas and the target oxygen concentration. Specifically, a mapping relationship can be maintained for adjustment. The mapping relationship is the mapping relationship between the oxygen concentration of the output gas and the target oxygen concentration and the flow rates of the first gas flow rate controller and the second gas flow rate controller.

[0134] It can be understood that when adjusting the first gas flow rate controller and the second gas flow rate controller according to the oxygen concentration of the output gas and the target oxygen concentration, the first gas flow rate controller and the second gas flow rate controller can be adjusted based on a preset adjustment rule according to the oxygen concentration of the output gas and the target oxygen concentration.

[0135] That is to say, the adjustment step, adjustment frequency or adjustment period can be set in advance to adjust the first gas flow rate controller and the second gas flow rate controller according to the oxygen concentration of the output gas and the target oxygen concentration. For example, the first gas flow rate controller and the second gas flow rate controller are adjusted during each exhalation phase and inhalation phase, or the first gas flow rate controller and the second gas flow rate controller are adjusted every two exhalation phases and every two inhalation phases (of course, other adjustment rules can also be adopted for adjustment, such as adjusting every 2 seconds in a cycle, adjusting every 2 seconds. Of course, it can also be adjusted according to the actual situation, and no specific limitation is made as long as the adjustment of the first gas flow rate controller and the second gas flow rate control can be achieved). Thus, a closed-loop adjustment can be formed, and it is judged whether it is within the respective dead zone ranges through the flow rates of the adjusted first gas flow rate controller and the second gas flow rate controller, and subsequent operations are executed.

[0136] It should be noted that during the process of closed-loop adjustment, if the oxygen concentration of the output gas of the inhalation branch 2 is stabilized to the target oxygen concentration, the adjustment is stopped; otherwise, the adjustment continues until the oxygen concentration of the output gas of the inhalation branch 2 is stabilized to the target oxygen concentration.

[0137] In summary, it can be seen that in the embodiment provided by the present application, the first gas flow rate control value and the second gas flow rate control value are determined according to the target output flow rate and the oxygen concentration setting value, and it is respectively judged whether the first gas flow rate control value belongs to the first dead zone range and whether the second gas flow rate control value belongs to the second dead zone range; if the first gas flow rate control value belongs to the first dead zone range, the first gas flow rate controller can be kept open during the inhalation phase and / or exhalation phase, and if the second gas flow rate control value belongs to the second dead zone range, the second gas flow rate controller can be kept open during the inhalation phase and / or exhalation phase. In this way, when the flow rate of the proportional valve is within its corresponding dead zone range, by adjusting the flow rate of the proportional valve, a stable small flow rate can be generated during high-frequency oscillation, ensuring stable and accurate oxygen concentration control within the oxygen concentration setting range.

[0138] Please refer to Figure 7 , Figure 7 which is a schematic virtual structure diagram of a high-frequency ventilation system provided by an embodiment of the present application. The high-frequency ventilation system 700 includes: a gas source interface 701, an inhalation branch ( Figure 7(not shown), a high-frequency pressure drop module 702, and a ventilation control device 703. The inhalation branch includes a first gas branch, a second gas branch, and a mixing branch. A first gas flow rate controller capable of generating a high-frequency pulsed flow rate is provided in the first gas branch, and a second gas flow rate controller capable of generating a high-frequency pulsed flow rate is provided in the second gas branch. The ventilation control device 703 is configured to:

[0139] Determine a first gas flow rate control value and a second gas flow rate control value according to a target output flow rate and an oxygen concentration setting value;

[0140] Judge whether the first gas flow rate control value belongs to a first dead zone range and whether the second gas flow rate control value belongs to a second dead zone range;

[0141] If the first gas flow rate control value belongs to the first dead zone range, keep the first gas flow rate controller on;

[0142] If the second gas flow rate control value belongs to the second dead zone range, keep the second gas flow rate controller on;

[0143] The first dead zone range corresponds to the dead zone range of the first gas flow rate controller, and the second dead zone range corresponds to the dead zone range of the second gas flow rate controller.

[0144] Optionally, the ventilation control device 703 is further configured to:

[0145] If the first gas flow rate control value belongs to the first dead zone range and the second gas flow rate control value does not belong to the second dead zone range, control the second gas flow rate controller to generate a high-frequency oscillation;

[0146] If the first gas flow rate control value does not belong to the first dead zone range and the second gas flow rate control value belongs to the second dead zone range, control the first gas flow rate controller to generate a high-frequency oscillation.

[0147] Optionally, the ventilation control device 703 is further configured to:

[0148] If the first gas flow rate control value belongs to the first dead zone range and the second gas flow rate control value belongs to the second dead zone range, control the high-frequency pressure drop module to generate a high-frequency oscillation.

[0149] Optionally, the high-frequency pressure drop module 702 includes a high-frequency valve and a turbine.

[0150] Optionally, the ventilation control device 703 controls the high-frequency pressure drop module to generate a high-frequency oscillation, including:

[0151] According to a preset high-frequency oscillation frequency, control the high-frequency valve and the turbine to make the gas generate a high-frequency oscillation.

[0152] Optionally, the ventilation control device 703 is further configured to:

[0153] If the first gas flow rate control value does not belong to the first dead zone range and the second gas flow rate control value does not belong to the second dead zone range, then control the first gas flow rate controller and the second gas flow rate controller to generate a high-frequency pulsed flow rate.

[0154] Optionally, the inhalation branch further is provided with an oxygen concentration detector for detecting the oxygen concentration of the gas output from the inhalation branch, and the ventilation control device 703 is further configured to;

[0155] If the oxygen concentration of the output gas detected by the oxygen concentration detector does not reach the target oxygen concentration, then adjust the first gas flow rate controller and the second gas flow rate controller according to the oxygen concentration of the output gas and the target oxygen concentration.

[0156] Optionally, the ventilation control device 703 adjusts the first gas flow rate controller and the second gas flow rate controller according to the oxygen concentration of the output gas and the target oxygen concentration, including:

[0157] Based on a preset adjustment rule, adjust the first gas flow rate controller and the second gas flow rate controller according to the oxygen concentration of the output gas and the target oxygen concentration.

[0158] Optionally, the ventilation control device 703 is further configured to:

[0159] Determine the first dead zone range according to the flow rate-current curve of the first gas flow rate controller;

[0160] Determine the second dead zone range according to the flow rate-current curve of the second gas flow rate controller.

[0161] Optionally, the ventilation control device 703 is further configured to:

[0162] Obtain the flow rate-current curve of the first gas flow rate controller and the flow rate-current curve of the second gas flow rate controller.

[0163] Of course, for the settings, controls, etc. of the gas source interface 701, the high-frequency pressure drop module 702, the inhalation branch, the exhalation branch, the first gas flow rate controller, the second gas flow rate controller, etc. in this high-frequency ventilation system, reference may be made to Figure 1 、 2 and the above description, which will not be elaborated here.

[0164] In summary, it can be seen that in the embodiments provided by the present application, the first gas flow rate control value and the second gas flow rate control value are determined according to the target output flow rate and the oxygen concentration setting value, and it is respectively determined whether the first gas flow rate control value belongs to the first dead zone range and whether the second gas flow rate control value belongs to the second dead zone range; if the first gas flow rate control value belongs to the first dead zone range, the first gas flow rate controller is kept open during the exhalation phase, and if the second gas flow rate control value belongs to the second dead zone range, the second gas flow rate controller is kept open during the exhalation phase. In this way, when the flow rate of the proportional valve is within its corresponding dead zone range, by adjusting the flow rate of the proportional valve, a stable small flow rate can be generated during the high-frequency oscillation process, ensuring stable and accurate oxygen concentration control within the oxygen concentration setting range.

[0165] In several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed mutual coupling, direct coupling, or communication connection can be through some interfaces, indirect coupling, or communication connection of devices or units, which can be electrical, mechanical, or other forms.

[0166] The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0167] In addition, in each embodiment of the present application, the functional units can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit. The above integrated units can be implemented in the form of hardware or in the form of software functional units.

[0168] When the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical discs that can store program codes.

[0169] As described above, the above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A ventilation adjustment method applied to a high-frequency ventilation system, the high-frequency ventilation system comprising: A gas source interface, an inhalation branch, a ventilation control device, and a high-frequency pressure drop module. The inhalation branch includes a first gas branch, a second gas branch, and a mixing branch. A first gas flow rate controller capable of generating a high-frequency pulsed flow rate is provided in the first gas branch, and a second gas flow rate controller capable of generating a high-frequency pulsed flow rate is provided in the second gas branch. It is characterized in that it includes: Determine a first gas flow rate control value and a second gas flow rate control value according to a target output flow rate and an oxygen concentration setting value; Judge whether the first gas flow rate control value belongs to a first dead zone range and whether the second gas flow rate control value belongs to a second dead zone range; If the first gas flow rate control value belongs to the first dead zone range, keep the first gas flow rate controller turned on; If the second gas flow rate control value belongs to the second dead zone range, keep the second gas flow rate controller turned on; The first dead zone range corresponds to the dead zone range of the first gas flow rate controller, and the second dead zone range corresponds to the dead zone range of the second gas flow rate controller.

2. The method according to claim 1, wherein The method further includes: If the first gas flow rate control value belongs to the first dead zone range and the second gas flow rate control value does not belong to the second dead zone range, control the second gas flow rate controller to generate a high-frequency oscillation; If the first gas flow rate control value does not belong to the first dead zone range and the second gas flow rate control value belongs to the second dead zone range, control the first gas flow rate controller to generate a high-frequency oscillation.

3. The method according to claim 1, wherein The method further includes: If the first gas flow rate control value belongs to the first dead zone range and the second gas flow rate control value belongs to the second dead zone range, control the high-frequency pressure drop module to generate a high-frequency oscillation.

4. The method according to claim 3, characterized in that, The high-frequency pressure drop module includes a high-frequency valve and a turbine.

5. The method according to claim 4, wherein The controlling the high-frequency pressure drop module to generate a high-frequency oscillation includes: According to a preset high-frequency oscillation frequency, control the high-frequency valve and the turbine to make the gas generate a high-frequency oscillation.

6. The method according to claim 1, characterized in that The method further includes: If the first gas flow rate control value does not belong to the first dead zone range and the second gas flow rate control value does not belong to the second dead zone range, control the first gas flow rate controller and the second gas flow rate controller to generate a high-frequency pulsed flow rate.

7. The method according to any one of claims 1 to 6, characterized in that, An oxygen concentration detector for detecting the oxygen concentration of the gas output from the inhalation branch is further provided in the inhalation branch; If the oxygen concentration of the output gas detected by the oxygen concentration detector does not reach the target oxygen concentration, adjust the first gas flow rate controller and the second gas flow rate controller according to the oxygen concentration of the output gas and the target oxygen concentration.

8. The method according to claim 7, wherein The adjusting the first gas flow rate controller and the second gas flow rate controller according to the oxygen concentration of the output gas and the target oxygen concentration includes: Based on a preset adjustment rule, adjust the first gas flow rate controller and the second gas flow rate controller according to the oxygen concentration of the output gas and the target oxygen concentration.

9. The method according to any one of claims 1 to 6, characterized in that The method further includes: Determine the first dead zone range according to the flow rate-current curve of the first gas flow rate controller; Determine the second dead zone range according to the flow rate-current curve of the second gas flow rate controller.

10. The method according to claim 9, wherein The method further includes: Obtain the flow rate-current curve of the first gas flow rate controller and the flow rate-current curve of the second gas flow rate controller.

11. A high-frequency ventilation system, the high-frequency ventilation system comprising: A gas source interface, an inhalation branch, a ventilation control device, and a high-frequency pressure drop module. The inhalation branch includes a first gas branch, a second gas branch, and a mixing branch. A first gas flow rate controller capable of generating a high-frequency pulsed flow rate is provided in the first gas branch, and a second gas flow rate controller capable of generating a high-frequency pulsed flow rate is provided in the second gas branch. It is characterized in that the ventilation control device is used for: Determine a first gas flow rate control value and a second gas flow rate control value according to a target output flow rate and an oxygen concentration setting value; Judge whether the first gas flow rate control value belongs to a first dead zone range and whether the second gas flow rate control value belongs to a second dead zone range; If the first gas flow rate control value belongs to the first dead zone range, keep the first gas flow rate controller on; If the second gas flow rate control value belongs to the second dead zone range, keep the second gas flow rate controller on; The first dead zone range corresponds to the dead zone range of the first gas flow rate controller, and the second dead zone range corresponds to the dead zone range of the second gas flow rate controller.

12. The high-frequency ventilation system according to claim 11, wherein, The ventilation control device is further used for: If the first gas flow rate control value belongs to the first dead zone range and the second gas flow rate control value does not belong to the second dead zone range, control the second gas flow rate controller to generate high-frequency oscillation; If the first gas flow rate control value does not belong to the first dead zone range and the second gas flow rate control value belongs to the second dead zone range, control the first gas flow rate controller to generate high-frequency oscillation.

13. The high-frequency ventilation system according to claim 11, wherein The ventilation control device is further used for: If the first gas flow rate control value belongs to the first dead zone range and the second gas flow rate control value belongs to the second dead zone range, control the high-frequency pressure drop module to generate high-frequency oscillation.

14. The high-frequency ventilation system according to claim 13, wherein The high-frequency pressure drop module includes a high-frequency valve and a turbine.

15. The high-frequency ventilation system according to claim 14, characterized in that, The ventilation control device controls the high-frequency pressure drop module to generate high-frequency oscillation, including: According to a preset high-frequency oscillation frequency, control the high-frequency valve and the turbine to make the gas generate high-frequency oscillation.

16. The high-frequency ventilation system according to claim 11, characterized in that, The ventilation control device is further used for: If the first gas flow rate control value does not belong to the first dead zone range and the second gas flow rate control value does not belong to the second dead zone range, control the first gas flow rate controller and the second gas flow rate controller to generate high-frequency pulsed flow rates.

17. The high-frequency ventilation system according to any one of claims 11 to 16, characterized in that, The inhalation branch is further provided with an oxygen concentration detector for detecting the oxygen concentration of the gas output from the inhalation branch. The ventilation control device is further used for; If the oxygen concentration of the output gas detected by the oxygen concentration detector does not reach the target oxygen concentration, adjust the first gas flow rate controller and the second gas flow rate controller according to the oxygen concentration of the output gas and the target oxygen concentration.

18. The high-frequency ventilation system according to claim 17, wherein The ventilation control device adjusts the first gas flow rate controller and the second gas flow rate controller according to the oxygen concentration of the output gas and the target oxygen concentration, including: Based on a preset adjustment rule, adjusting the first gas flow rate controller and the second gas flow rate controller according to the oxygen concentration of the output gas and the target oxygen concentration.

19. The high-frequency ventilation system according to any one of claims 11 to 16, characterized in that, The ventilation control device is further configured to: Determine the first dead zone range according to the flow rate-current curve of the first gas flow rate controller; Determine the second dead zone range according to the flow rate-current curve of the second gas flow rate controller.

20. The high-frequency ventilation system according to claim 19, characterized in that, The ventilation control device is further configured to: Obtain the flow rate-current curve of the first gas flow rate controller and the flow rate-current curve of the second gas flow rate controller.

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