A high-frequency sinusoidal airflow generating device, a ventilator and a control method thereof

Abstract

The present invention discloses a high-frequency sinusoidal airflow generating device, comprising: an air source generating module, an electromagnetic valve and a pressure sensor, wherein the air source generating module outputs a high-frequency sinusoidal airflow through a ventilation pipeline and collects the gas pressure in the ventilation pipeline through a pressure collection pipeline; the electromagnetic valve is arranged on the ventilation pipeline, and the pressure sensor is arranged on the pressure collection pipeline; the ventilation pipeline is connected to the vent of the air source generating module, and a breathing valve is arranged on the ventilation pipeline, and the breathing valve includes a pressure collection interface, and the pressure collection interface is connected to the pressure collection pipeline; the air source generating module is used to collect the pressure signal on the ventilation pipeline according to the pressure sensor on the pressure collection pipeline to control the opening and closing degree of the electromagnetic valve, thereby regulating the pressure of the ventilation pipeline in real time, so that the air source generating module outputs the required high-frequency sinusoidal airflow. The present invention solves the problem that the existing mainstream high-frequency ventilation method generates relatively large noise when using tympanic membrane oscillation to generate high-frequency airflow for ventilation.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a high-frequency sinusoidal airflow generating device, a ventilator and a control method thereof. Background Art

[0002] High-frequency ventilation is a specialized ventilation method that utilizes tidal volumes close to or less than the anatomical dead space (approximately 2 ml / kg), high ventilation frequencies (currently recognized as ≥4 times normal), and low airway pressures. Compared to conventional conventional mechanical ventilation, it overcomes the problems of alveolar collapse at end-expiration and alveolar overdistension at end-inspiration while ensuring adequate lung diffusion and oxygen exchange. Consequently, it has garnered widespread attention in the critical care medicine community in recent years and is increasingly being used in clinical practice.

[0003] Currently, mainstream high-frequency ventilation (HFV) methods all rely on tympanic membrane oscillation to generate high-frequency airflow. These methods primarily utilize a motor-driven tympanic membrane and an oscillator. Consequently, these ventilators generate considerable noise during operation. Furthermore, the algorithm's principles involve knowledge from multiple fields, including motor control, mechanical vibration, and electronic oscillation. For high-frequency airflows with other waveforms, including sinusoidal ones, complex control circuitry, signal sensing and processing, and control algorithms are required to control the opening of multiple associated valves. Summary of the Invention

[0004] The embodiments of the present invention provide a high-frequency sinusoidal airflow generating device, a ventilator and a control method thereof, so as to solve the problem that the existing mainstream high-frequency ventilation method generates relatively large noise when using tympanic membrane oscillation to generate high-frequency airflow for ventilation.

[0005] A high-frequency sinusoidal airflow generating device, comprising:

[0006] An air source generating module, a solenoid valve, and a pressure sensor. The air source generating module outputs a high-frequency sinusoidal airflow through a ventilation pipeline, and the air source generating module collects the gas pressure in the ventilation pipeline through a pressure collection pipeline. The solenoid valve is arranged on the ventilation pipeline, and the pressure sensor is arranged on the pressure collection pipeline.

[0007] The ventilation pipeline is connected to the ventilation port of the gas source generating module, and a breathing valve is provided on the ventilation pipeline. The breathing valve includes a pressure collection interface, and the pressure collection interface is connected to the pressure collection pipeline;

[0008] The air source generating module is used to collect the pressure signal on the ventilation pipeline according to the pressure sensor on the pressure collecting pipeline to control the opening and closing degree of the solenoid valve, and then adjust the size of the ventilation pipeline pressure in real time, so that the air source generating module outputs the required high-frequency sinusoidal airflow.

[0009] Preferably, the specific steps of regulating the pressure of the ventilation line include:

[0010] When it is determined that the pressure signal collected on the ventilation pipeline is greater than the airway pressure of the current ventilation pipeline, the opening of the solenoid valve is increased to deflate the air, so that the airway pressure of the current ventilation pipeline is reduced; when the pressure signal collected on the ventilation pipeline is not greater than the airway pressure of the current ventilation pipeline, the opening of the solenoid valve is reduced or closed, so that the airway pressure of the current ventilation pipeline is increased.

[0011] Preferably, the high-frequency sinusoidal airflow satisfies the following expression:

[0012]

[0013] Among them, P is the pressure collected by the pressure sensor, Ppeak is the peak airway pressure, Plow is the positive end-expiratory pressure, A is the amplitude of the sinusoidal airflow, MAP is the mean airway pressure, and f is the oscillation frequency. is the sampling interval of the pressure sensor, and k is the sampling number of the pressure sensor.

[0014] Preferably, the breathing valve also includes a gas supply end interface, a patient end interface and an exhalation exhaust port; the gas supply end interface is connected to the ventilation pipeline; the patient end interface is connected to the patient through a pipeline; the exhalation exhaust port is connected to the atmosphere when the patient exhales and is closed when the patient inhales.

[0015] Preferably, a control chip is provided in the gas source generating module, the acquisition end of the control chip is connected to the pressure sensor, and the control end of the control chip is connected to the solenoid valve; the control chip is used to obtain the current signal of the solenoid valve according to the pressure signal collected by the pressure sensor, generate the opening and closing degree instruction of the solenoid valve, and send the opening and closing degree instruction to the control end of the solenoid valve.

[0016] A control method for a high-frequency sinusoidal airflow generating device is provided. The control method is applied to the high-frequency sinusoidal airflow generating device described above, and the control method comprises:

[0017] Obtain the preset oscillation frequency and sampling interval of the pressure sensor;

[0018] The output frequency of the sinusoidal airflow in the ventilation line is controlled according to the oscillation frequency; according to the sampling interval, the pressure signal of the ventilation line is collected by the pressure sensor to control the opening and closing degree of the solenoid valve, and then the pressure of the ventilation line is adjusted in real time, so that the air source generating module outputs the required high-frequency sinusoidal airflow.

[0019] Preferably, the specific steps of regulating the pressure of the ventilation line include:

[0020] When it is determined that the pressure signal collected on the ventilation pipeline is greater than the airway pressure of the current ventilation pipeline, the opening of the solenoid valve is increased to deflate the air, so that the airway pressure of the current ventilation pipeline is reduced; when the pressure signal collected on the ventilation pipeline is not greater than the airway pressure of the current ventilation pipeline, the opening of the solenoid valve is reduced or closed, so that the airway pressure of the current ventilation pipeline is increased.

[0021] A ventilator, comprising:

[0022] A ventilator main unit, a solenoid valve and a pressure sensor, wherein the ventilator main unit outputs a high-frequency sinusoidal airflow through a ventilation pipeline, and the ventilator main unit collects the gas pressure in the ventilation pipeline through a pressure collection pipeline; the solenoid valve is arranged on the ventilation pipeline, and the pressure sensor is arranged on the pressure collection pipeline;

[0023] The ventilation line is connected to the ventilation port of the ventilator host, and a breathing valve is provided on the ventilation line. The breathing valve includes a pressure collection interface, and the pressure collection interface is connected to the pressure collection pipeline;

[0024] The ventilator host is used to control the opening and closing degree of the solenoid valve based on the pressure signal on the ventilation pipeline collected by the pressure sensor on the pressure collection pipeline, and then adjust the size of the ventilation pipeline pressure in real time, so that the ventilator host can output the required high-frequency sinusoidal airflow.

[0025] A method for controlling a ventilator, the method being applied to the ventilator described above, the method comprising:

[0026] Obtain the preset oscillation frequency and sampling interval of the pressure sensor;

[0027] The output frequency of the sinusoidal airflow in the ventilation circuit is controlled according to the oscillation frequency; according to the sampling interval, the pressure signal of the ventilation circuit is collected by the pressure sensor to control the opening and closing degree of the solenoid valve, and then the pressure of the ventilation circuit is adjusted in real time so that the ventilator host can output the required high-frequency sinusoidal airflow.

[0028] Preferably, the specific steps of regulating the pressure of the ventilation line include:

[0029] When it is determined that the pressure signal collected on the ventilation pipeline is greater than the airway pressure of the current ventilation pipeline, the opening of the solenoid valve is increased to deflate the air, so that the airway pressure of the current ventilation pipeline is reduced; when the pressure signal collected on the ventilation pipeline is not greater than the airway pressure of the current ventilation pipeline, the opening of the solenoid valve is reduced or closed, so that the airway pressure of the current ventilation pipeline is increased.

[0030] The high-frequency sinusoidal airflow generating device, method, and ventilator provided by the present invention have the following beneficial effects:

[0031] The device of the present invention includes an air source generating module, an electromagnetic valve and a pressure sensor. The air source generating module is used to collect the pressure signal on the ventilation pipeline according to the pressure sensor on the pressure collection pipeline to control the opening and closing degree of the electromagnetic valve, thereby adjusting the pressure of the ventilation pipeline in real time, so that the air source generating module outputs the required high-frequency sinusoidal airflow.

[0032] The present invention uses the pressure signal collected by the pressure sensor to control the opening and closing of the solenoid valve, thereby controlling the pressure changes in the ventilation line, so that the ventilation line outputs a sinusoidal airflow. Because the solenoid valve regulates the pressure in the ventilation line relatively slowly, the pressure amplitude of the sinusoidal airflow changes relatively slowly each time it is adjusted. Therefore, the amount of air released by the solenoid valve during a single adjustment of the airway pressure is relatively small. Therefore, the noise level during operation of the solenoid valve is relatively low, which can improve the patient experience to a certain extent. Therefore, the present invention solves the problem of the existing mainstream high-frequency ventilation method that generates high noise when using tympanic membrane oscillation to generate high-frequency airflow for ventilation. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0034] Figure 1 1 is a schematic diagram of the structure of a high-frequency sinusoidal airflow generating device according to an embodiment of the present invention;

[0035] Figure 2 This is a flow chart of a control method for a high-frequency sinusoidal airflow generating device according to an embodiment of the present invention;

[0036] Figure 3 is a waveform diagram of a high-frequency sinusoidal airflow generated in an embodiment of the present invention;

[0037] Figure 4 is a waveform diagram of a high-frequency sinusoidal airflow generated in an embodiment of the present invention;

[0038] In the figure: 1. Gas source generation module; 2. Solenoid valve; 3. Pressure sensor; 4. Ventilation pipeline; 5. Pressure collection pipeline; 6. Breathing valve; 61. Gas supply end interface; 62. Exhalation exhaust port; 63. Patient end interface; 64. Pressure collection interface. DETAILED DESCRIPTION

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0040] The following describes the invention through specific embodiments.

[0041] In one embodiment, if Figure 1 The figure shows a high-frequency sinusoidal airflow generating device disclosed in an embodiment of the present invention, comprising: an air source generating module 1, an electromagnetic valve 2 and a pressure sensor 3, wherein the air source generating module 1 collects the gas pressure at the patient end of the ventilation pipeline 4 through the pressure collection pipe 5, and outputs the high-frequency sinusoidal airflow required by the patient when used through the ventilation pipeline 4; one end of the electromagnetic valve 2 is connected to the ventilation pipeline 2 near one end of the air source generating module 1, and the other end of the electromagnetic valve 2 is facing the air; the pressure sensor 3 is arranged on the pressure collection pipe 5, and is used to collect the air pressure of the ventilation pipeline 4 near the patient end.

[0042] One end of the ventilation pipeline 4 close to the gas source generating module 1 is connected to the vent of the gas source generating module 1. The gas source generating module 1 provides gas of the pressure required by the patient to the ventilation pipeline 4 through the vent. A breathing valve 6 is also provided on the ventilation pipeline 4 near the patient end, and is connected to the patient end through the breathing valve 6; a pressure collection interface 64 is provided on the breathing valve 6, and the pressure collection interface 64 is connected to the pressure collection pipeline 5, and its main function is to collect the gas pressure at the patient end.

[0043] During the use of the device, the airflow generating device will control the opening and closing degree of the solenoid valve 2 according to the air pressure at the patient end collected by the pressure sensor 3, thereby adjusting the airflow pressure in the ventilation pipeline 4 to change according to the required air pressure at the patient end, and then make the ventilation port of the air source generating module 1 output the high-frequency sinusoidal airflow required by the patient end.

[0044] This embodiment uses only one solenoid valve and one sensor. The algorithm principle is simple and easy to implement, and only involves a method for controlling the opening and closing degree of the solenoid valve. Therefore, this solution solves the problem that the existing high-frequency ventilation technology uses multiple valves and the algorithm principle for controlling the opening of the valve is relatively complex to implement.

[0045] In one embodiment, the specific steps of regulating the airflow pressure in the ventilation circuit 4 according to the air pressure at the patient end include the following:

[0046] When it is determined that the pressure signal collected on the ventilation pipeline is greater than the airway pressure of the current ventilation pipeline, the opening of the solenoid valve is increased to deflate the air, so that the airway pressure of the current ventilation pipeline is reduced; when the pressure signal collected on the ventilation pipeline is not greater than the airway pressure of the current ventilation pipeline, the opening of the solenoid valve is reduced or closed, so that the airway pressure of the current ventilation pipeline is increased.

[0047] Specifically, the airflow generating device will judge the size of the pressure signal on the ventilation tube 4 at the patient end collected by the pressure sensor 3. When it is detected that the gas pressure at the patient end is greater than the airway pressure of the ventilation tube 4 at the current solenoid valve 2, the solenoid valve 2 will be controlled to increase its opening, so that the solenoid valve 2 will deflate the empty end, so that the airway pressure of the current ventilation tube 4 will gradually decrease; when it is detected that the gas pressure at the patient end is equal to the airway pressure of the ventilation tube 4 at the current solenoid valve 2, the opening of the solenoid valve 2 will be maintained unchanged, so that the airway pressure of the current ventilation tube 4 will maintain the current pressure value in a stable state; when it is detected that the gas pressure at the patient end is less than the airway pressure of the ventilation tube 4 at the current solenoid valve 2, the solenoid valve 2 will be controlled to reduce its opening or close the solenoid valve 2, so that the airway pressure of the current ventilation tube 4 will gradually increase.

[0048] In this embodiment, the pressure sensor 3 is used to collect the pressure signal at the patient end to control the opening size of the solenoid valve 2, thereby adjusting the airflow pressure in the ventilation pipeline 4 to change according to the respiratory pressure required by the patient end, thereby realizing sinusoidal high-frequency oscillation. The control principle is simple, relatively easy to implement in actual application, and the overall investment cost is relatively low.

[0049] In one embodiment, the high-frequency sinusoidal airflow of the high-frequency sinusoidal airflow generating device satisfies the following expression:

[0050]

[0051] Wherein, P is the pressure at the patient end collected by the pressure sensor 3, Ppeak is the peak airway pressure at the patient end of the ventilation tube 4, Plow is the positive end-expiratory pressure at the patient end of the ventilation tube 4, A is the amplitude of the final sinusoidal airflow generated by the device, MAP is the mean airway pressure of the ventilation tube 4, and f is the oscillation frequency of the sinusoidal airflow output by the device. is the sampling interval of the pressure sensor, and k is the sampling number of the pressure sensor.

[0052] Specifically, the initial mean airway pressure MAP and oscillation frequency f need to be manually set on the airflow generating device. The air source generating module 1 will supply air to the ventilation pipe 4 according to the initially set MAP, but after the pressure sensor 3 collects the patient end pressure for multiple cycles, as shown in FIG. Figure 3 and Figure 4As shown, the peak airway pressure Ppeak and the positive end-expiratory pressure Plow values ​​can be obtained by numerical statistical methods, and the new MAP can be calculated based on the Ppeak and Plow values. Finally, the gas pressure value provided by the current gas source generating module 1 is adjusted in real time based on the newly obtained MAP. The sinusoidal airflow finally output by the airflow generating device will be output according to the initially set oscillation frequency.

[0053] In one embodiment, the breathing valve of the high-frequency sinusoidal airflow generating device also includes an air supply end interface, a patient end interface and an exhalation exhaust port; the air supply end interface is connected to the ventilation pipeline; the patient end interface is connected to the patient through a pipeline; the exhalation exhaust port is connected to the atmosphere when the patient exhales and is closed when the patient inhales.

[0054] Specifically, the breathing valve 6 is also provided with an air supply end interface 61, a patient end interface 63 and an exhalation exhaust port 62; the air supply end interface 61 is connected to the ventilation pipeline 4 on the air source generating module 1; it is used to provide the required high-frequency sinusoidal airflow to the patient end, and the patient end interface 63 is connected to the ventilation pipeline 4 close to the patient end; the exhalation exhaust port 62 is connected to the atmosphere when the patient exhales and is closed when the patient inhales.

[0055] By setting a breathing valve on the ventilation pipeline 4, the patient's exhaled gas can be discharged from the ventilation pipeline 4 through the exhalation exhaust port 62 on the breathing valve when exhaling, thereby realizing the separation of the airflow in the ventilation pipeline 4 during exhalation and inhalation, and preventing the exhaled gas from affecting the airflow at the gas transmission end interface 61.

[0056] In one embodiment, a control chip is provided in the gas source generating module, the acquisition end of the control chip is connected to the pressure sensor, and the control end of the control chip is connected to the solenoid valve; the control chip is used to obtain the current signal of the solenoid valve based on the pressure signal collected by the pressure sensor, generate an opening and closing degree instruction of the solenoid valve, and send the opening and closing degree instruction to the control end of the solenoid valve.

[0057] Specifically, a control chip is provided in the gas source generating module, and the acquisition end of the control chip is connected to the pressure sensor 3. The pressure sensor 3 will send the collected pressure signal from the patient end to the acquisition end. After the acquisition end of the control chip receives the pressure signal, it will obtain the corresponding current signal of the solenoid valve according to the pressure signal collected by the pressure sensor 3, and generate the opening and closing degree instruction of the solenoid valve 2 from the current signal. The control chip finally sends the opening and closing degree instruction to the solenoid valve 2 through the control end; after the solenoid valve 2 receives the opening and closing degree instruction signal, it will control the opening and closing degree of the solenoid valve 2 according to the received opening and closing degree, thereby realizing the control of the airway pressure in the ventilation pipeline 4 and adjusting it according to the pressure size collected by the pressure sensor 3.

[0058] The principle of the control chip obtaining the current signal corresponding to the solenoid valve 2 through the pressure signal is as follows:

[0059] During the debugging stage of the device, the control chip will collect the patient-end pressure signal through the sensor 3 for multiple cycles, and adjust the opening and closing degree of the solenoid valve 2 through multiple experiments, so that the airway pressure in the ventilation pipeline 4 is finally controlled within the required pressure value range. Through experimental learning of multiple sets of data, the correspondence between the pressure signal and the current signal of the solenoid valve is obtained at this time. After the device is officially put into operation, the control chip will realize the conversion of the pressure signal of the pressure sensor 3 to the current signal of the solenoid valve 2 according to the learned correspondence between the pressure signal and the current signal of the solenoid valve.

[0060] In one embodiment, if Figure 2 As shown, a flow chart of a control method of a high-frequency sinusoidal airflow generating device is provided. The control method is applied to the high-frequency sinusoidal airflow generating device in the above embodiment. The control method specifically includes:

[0061] Get the preset oscillation frequency and sampling interval of the pressure sensor.

[0062] The output frequency of the sinusoidal airflow in the ventilation line is controlled according to the oscillation frequency; according to the sampling interval, the pressure signal of the ventilation line is collected by the pressure sensor to control the opening and closing degree of the solenoid valve, and then the pressure of the ventilation line is adjusted in real time, so that the air source generating module outputs the required high-frequency sinusoidal airflow.

[0063] Specifically, the oscillation frequency of the sinusoidal airflow output by the airflow generating device and the sampling interval of the pressure sensor 3 are obtained, wherein the oscillation frequency needs to be manually set, and the sampling interval of the pressure sensor 3 is generally related to the sampling frequency of the pressure sensor 3 and is equal to the inverse of the sampling frequency.

[0064] The sinusoidal airflow in the ventilation line 4 is controlled to be output to the patient end according to the above-mentioned oscillation frequency; the pressure signal of the ventilation line 4 collected by the pressure sensor 3 is obtained regularly according to the sampling interval time, and the opening and closing degree of the solenoid valve 2 is controlled by the size of the pressure signal. Since one end of the solenoid valve 2 is connected to the ventilation line 4 and the other end is facing the air, the opening and closing degree of the solenoid valve 2 represents the amount of air released from the air-facing end to the air flow in the ventilation line 4, and the amount of air flow in the ventilation line 4 corresponds to the size of the pipeline pressure in the ventilation line 4. This solution enables the air source generating module 1 to output the required high-frequency sinusoidal airflow by regulating the size of the pipeline pressure in the ventilation line 4.

[0065] In one embodiment, the specific steps of regulating the pressure of the ventilation line include:

[0066] When it is determined that the pressure signal collected on the ventilation pipeline is greater than the airway pressure of the current ventilation pipeline, the opening of the solenoid valve is increased to deflate the air, so that the airway pressure of the current ventilation pipeline is reduced; when the pressure signal collected on the ventilation pipeline is not greater than the airway pressure of the current ventilation pipeline, the opening of the solenoid valve is reduced or closed, so that the airway pressure of the current ventilation pipeline is increased.

[0067] Specifically, the airflow generating device will judge the size of the pressure signal on the ventilation line 4 at the patient end collected by the pressure sensor 3. When it is detected that the gas pressure at the patient end is greater than the airway pressure of the ventilation line 4 at the current solenoid valve 2, the solenoid valve 2 will be controlled to increase its opening, so that the solenoid valve 2 will deflate the empty end, so that the airway pressure of the current ventilation line 4 will gradually decrease; when it is detected that the gas pressure at the patient end is equal to the airway pressure of the ventilation line 4 at the current solenoid valve 2, the opening of the solenoid valve 2 will be maintained unchanged, so that the airway pressure of the current ventilation line 4 will maintain the current pressure value in a stable state; when it is detected that the gas pressure at the patient end is less than the airway pressure of the ventilation line 4 at the current solenoid valve 2, the solenoid valve 2 will be controlled to reduce its opening or close the solenoid valve 2, so that the airway pressure of the current ventilation line 4 will gradually increase.

[0068] In this embodiment, the pressure sensor 3 is used to collect the pressure signal at the patient end to control the opening size of the solenoid valve 2, thereby adjusting the airflow pressure in the ventilation pipeline 4 to change according to the respiratory pressure required by the patient end, thereby realizing sinusoidal high-frequency oscillation. The control principle is simple, relatively easy to implement in actual application, and the overall investment cost is relatively low.

[0069] In one embodiment, a ventilator is provided, comprising:

[0070] The ventilator main unit, the solenoid valve 2 and the pressure sensor 3, wherein the ventilator main unit collects the gas pressure in the ventilation pipeline 4 through the pressure collection pipe 5, and outputs the high-frequency sinusoidal airflow required by the patient when using it through the ventilation pipeline 4; one end of the solenoid valve 2 is connected to the ventilation pipeline 4 close to one end of the ventilator main unit 1, and the other end of the solenoid valve 2 is facing the air; the pressure sensor 3 is set on the pressure collection pipe 5, and is used to collect the air pressure of the ventilation pipeline 4 close to the patient end.

[0071] The end of the ventilation pipeline close to the ventilator main unit is connected to the ventilation port of the ventilator main unit. The ventilator main unit provides gas of the required pressure to the ventilation pipeline 4 through the ventilation port. A breathing valve 6 is also provided on the ventilation pipeline 4 near the patient end, and is connected to the patient end through the breathing valve 6; a pressure collection interface 64 is provided on the breathing valve 6, and the pressure collection interface 64 is connected to the pressure collection pipe 5, and its main function is to collect the gas pressure at the patient end.

[0072] During the use of the device, the airflow generating device will control the opening and closing degree of the electromagnetic 2 according to the air pressure at the patient end collected by the pressure sensor 3, thereby adjusting the airflow pressure in the ventilation pipeline 4 to change according to the required air pressure at the patient end, and then make the ventilation port of the ventilator host output the high-frequency sinusoidal airflow required by the patient end.

[0073] This embodiment uses only one solenoid valve and one sensor. The algorithm principle is simple and easy to implement, and only involves a method for controlling the opening and closing degree of the solenoid valve. Therefore, this solution solves the problem that the existing high-frequency ventilation technology uses multiple valves and the algorithm principle for controlling the opening of the valve is relatively complex to implement.

[0074] In one embodiment, a control method for a ventilator is provided. The control method is applied to the ventilator in the above embodiment, and the control method specifically includes:

[0075] Get the preset oscillation frequency and sampling interval of the pressure sensor.

[0076] The output frequency of the sinusoidal airflow in the ventilation circuit is controlled according to the oscillation frequency; according to the sampling interval, the pressure signal of the ventilation circuit is collected by the pressure sensor to control the opening and closing degree of the solenoid valve, and then the pressure of the ventilation circuit is adjusted in real time so that the ventilator host can output the required high-frequency sinusoidal airflow.

[0077] Specifically, the oscillation frequency of the sinusoidal airflow output by the ventilator and the sampling interval of the pressure sensor 3 are obtained, wherein the oscillation frequency needs to be set manually, and the sampling interval of the pressure sensor 3 is generally related to the sampling frequency of the pressure sensor 3 and is equal to the inverse of the sampling frequency.

[0078] The sinusoidal airflow in the ventilation circuit 4 is controlled to be output to the patient end according to the above-mentioned oscillation frequency; the pressure signal of the ventilation circuit 4 collected by the pressure sensor 3 is obtained regularly according to the sampling interval time, and the opening and closing degree of the solenoid valve 2 is controlled by the size of the pressure signal. Since one end of the solenoid valve 2 is connected to the ventilation circuit 4 and the other end is facing the air, the opening and closing degree of the solenoid valve 2 represents the amount of air released from the air-facing end to the air flow in the ventilation circuit 4, and the amount of air flow in the ventilation circuit 4 corresponds to the size of the pipeline pressure in the ventilation circuit 4. This solution enables the ventilator host to output the required high-frequency sinusoidal airflow by regulating the size of the pipeline pressure in the ventilation circuit 4.

[0079] In one embodiment, the specific steps of regulating the pressure of the ventilation line include:

[0080] When it is determined that the pressure signal collected on the ventilation pipeline is greater than the airway pressure of the current ventilation pipeline, the opening of the solenoid valve is increased to deflate the air, so that the airway pressure of the current ventilation pipeline is reduced; when the pressure signal collected on the ventilation pipeline is not greater than the airway pressure of the current ventilation pipeline, the opening of the solenoid valve is reduced or closed, so that the airway pressure of the current ventilation pipeline is increased.

[0081] Specifically, the ventilator will judge the size of the pressure signal on the ventilation line 4 at the patient end collected by the pressure sensor 3. When it is detected that the gas pressure at the patient end is greater than the airway pressure of the ventilation line 4 at the current solenoid valve 2, the solenoid valve 2 will be controlled to increase its opening, so that the solenoid valve 2 will deflate the empty end, so that the airway pressure of the current ventilation line 4 will gradually decrease; when it is detected that the gas pressure at the patient end is equal to the airway pressure of the ventilation line 4 at the current solenoid valve 2, the opening of the solenoid valve 2 will be maintained unchanged, so that the airway pressure of the current ventilation line 4 will maintain the current pressure value in a stable state; when it is detected that the gas pressure at the patient end is less than the airway pressure of the ventilation line 4 at the current solenoid valve 2, the solenoid valve 2 will be controlled to reduce its opening or close the solenoid valve 2, so that the airway pressure of the current ventilation line 4 will gradually increase.

[0082] In this embodiment, the pressure sensor 3 is used to collect the pressure signal at the patient end to control the opening size of the solenoid valve 2, thereby adjusting the airflow pressure in the ventilation pipeline 4 to change according to the respiratory pressure required by the patient end, thereby realizing sinusoidal high-frequency oscillation. The control principle is simple, relatively easy to implement in actual application, and the overall investment cost is relatively low.

[0083] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included in the scope of protection of the present invention.

Claims

1. A high-frequency sinusoidal airflow generating device, characterized in that: include: An air source generating module, a solenoid valve, and a pressure sensor. The air source generating module outputs a high-frequency sinusoidal airflow through a ventilation pipeline, and the air source generating module collects the gas pressure in the ventilation pipeline through a pressure collection pipeline. The solenoid valve is arranged on the ventilation pipeline, and the pressure sensor is arranged on the pressure collection pipeline. The ventilation pipeline is connected to the ventilation port of the gas source generating module, and a breathing valve is provided on the ventilation pipeline. The breathing valve includes a pressure collection interface, and the pressure collection interface is connected to the pressure collection pipeline; The air source generation module is used to collect the pressure signal on the ventilation pipeline according to the pressure sensor on the pressure collection pipeline to control the opening and closing degree of the solenoid valve, thereby adjusting the pressure of the ventilation pipeline in real time, so that the air source generation module outputs the required high-frequency sinusoidal airflow; The high-frequency sinusoidal airflow satisfies the following expression: Among them, P is the pressure collected by the pressure sensor, Ppeak is the peak airway pressure, Plow is the positive end-expiratory pressure, A is the amplitude of the sinusoidal airflow, MAP is the mean airway pressure, and f is the oscillation frequency. is the sampling interval of the pressure sensor, and k is the sampling number of the pressure sensor.

2. The high-frequency sinusoidal airflow generating device according to claim 1, characterized in that: The specific steps of regulating the size of the ventilation line pressure include: When it is determined that the pressure signal collected on the ventilation pipeline is greater than the airway pressure of the current ventilation pipeline, the opening of the solenoid valve is increased to deflate the air, so that the airway pressure of the current ventilation pipeline is reduced; when the pressure signal collected on the ventilation pipeline is not greater than the airway pressure of the current ventilation pipeline, the opening of the solenoid valve is reduced or closed, so that the airway pressure of the current ventilation pipeline is increased.

3. The high-frequency sinusoidal airflow generating device according to claim 1, characterized in that: The breathing valve also includes an air supply end interface, a patient end interface and an exhalation exhaust port; the air supply end interface is connected to the ventilation pipeline; the patient end interface is connected to the patient through a pipeline; the exhalation exhaust port is connected to the atmosphere when the patient exhales and is closed when the patient inhales.

4. The high-frequency sinusoidal airflow generating device according to any one of claims 1 to 3, characterized in that: A control chip is provided in the gas source generating module, the acquisition end of the control chip is connected to the pressure sensor, and the control end of the control chip is connected to the solenoid valve; the control chip is used to obtain the current signal of the solenoid valve according to the pressure signal collected by the pressure sensor, generate the opening and closing degree instruction of the solenoid valve, and send the opening and closing degree instruction to the control end of the solenoid valve.

5. A control method for a high-frequency sinusoidal airflow generating device, characterized in that the control method is applied to the high-frequency sinusoidal airflow generating device according to claim 1, and the control method comprises: Obtain the preset oscillation frequency and sampling interval of the pressure sensor; The output frequency of the sinusoidal airflow in the ventilation line is controlled according to the oscillation frequency; according to the sampling interval, the pressure signal of the ventilation line is collected by the pressure sensor to control the opening and closing degree of the solenoid valve, and then the pressure of the ventilation line is adjusted in real time, so that the air source generating module outputs the required high-frequency sinusoidal airflow.

6. The control method of the high-frequency sinusoidal airflow generating device according to claim 5, wherein the specific step of regulating the pressure of the ventilation line comprises: When it is determined that the pressure signal collected on the ventilation pipeline is greater than the airway pressure of the current ventilation pipeline, the opening of the solenoid valve is increased to deflate the air, so that the airway pressure of the current ventilation pipeline is reduced; when the pressure signal collected on the ventilation pipeline is not greater than the airway pressure of the current ventilation pipeline, the opening of the solenoid valve is reduced or closed, so that the airway pressure of the current ventilation pipeline is increased.

7. A ventilator, comprising: A ventilator main unit, a solenoid valve and a pressure sensor, wherein the ventilator main unit outputs a high-frequency sinusoidal airflow through a ventilation pipeline, and the ventilator main unit collects the gas pressure in the ventilation pipeline through a pressure collection pipeline; the solenoid valve is arranged on the ventilation pipeline, and the pressure sensor is arranged on the pressure collection pipeline; The ventilation line is connected to the ventilation port of the ventilator host, and a breathing valve is provided on the ventilation line. The breathing valve includes a pressure collection interface, and the pressure collection interface is connected to the pressure collection pipeline; The ventilator host is used to control the opening and closing degree of the solenoid valve according to the pressure signal on the ventilation pipeline collected by the pressure sensor on the pressure collection pipeline, thereby adjusting the size of the ventilation pipeline pressure in real time, so that the ventilator host outputs the required high-frequency sinusoidal airflow; The high-frequency sinusoidal airflow satisfies the following expression: Among them, P is the pressure collected by the pressure sensor, Ppeak is the peak airway pressure, Plow is the positive end-expiratory pressure, A is the amplitude of the sinusoidal airflow, MAP is the mean airway pressure, and f is the oscillation frequency. is the sampling interval of the pressure sensor, and k is the sampling number of the pressure sensor.

8. A method for controlling a ventilator, characterized in that the method is applied to the ventilator according to claim 7, the method comprising: Obtain the preset oscillation frequency and sampling interval of the pressure sensor; The output frequency of the sinusoidal airflow in the ventilation circuit is controlled according to the oscillation frequency; according to the sampling interval, the pressure signal of the ventilation circuit is collected by the pressure sensor to control the opening and closing degree of the solenoid valve, and then the pressure of the ventilation circuit is adjusted in real time so that the ventilator host can output the required high-frequency sinusoidal airflow.

9. The ventilator control method according to claim 8, wherein the specific step of regulating the pressure of the ventilation circuit comprises: When it is determined that the pressure signal collected on the ventilation pipeline is greater than the airway pressure of the current ventilation pipeline, the opening of the solenoid valve is increased to deflate the air, so that the airway pressure of the current ventilation pipeline is reduced; when the pressure signal collected on the ventilation pipeline is not greater than the airway pressure of the current ventilation pipeline, the opening of the solenoid valve is reduced or closed, so that the airway pressure of the current ventilation pipeline is increased.

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