A high frequency jet ventilator system and control method

Abstract

The application discloses a high-frequency jet ventilator system and a control method. The control method comprises the following steps: acquiring the oxygen flow and air flow in the oxygen gas circuit and the air gas circuit through a first flow sensor and a second flow sensor respectively; monitoring the current oxygen concentration in the air-oxygen mixing device in real time by using an oxygen concentration monitoring system; comparing the monitored current oxygen concentration with a target oxygen concentration, and determining the oxygen output parameter and the air output parameter by using an optimal oxygen concentration prediction model; and controlling the air proportional valve, the oxygen proportional valve and the mixed gas proportional valve according to the determined oxygen output parameter and the air output parameter, so as to realize stable control of the target oxygen amount. Through real-time monitoring, intelligent feedback adjustment and multi-parameter optimization, the patient can obtain appropriate and constant oxygen supply in the whole breathing cycle, and the stability and accuracy of the oxygen supply are further improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of respirators, and particularly relates to a high-frequency jet respirator system and a control method. BACKGROUND

[0002] High-frequency jet ventilators (HFV) are widely used in intensive care, emergency and anesthesia fields, and are mainly used for assisting ventilation of patients with respiratory dysfunction. Compared with traditional respirators, HFV can deliver gas to patients at a higher frequency and smaller jet volume, which is suitable for improving lung gas exchange and ventilation function.

[0003] However, one of the main challenges of HFV is the stable control of oxygen concentration, especially during high-frequency jetting. Fluctuations in oxygen concentration can affect the oxygenation level of patients. Moreover, current HFV technology still has instability problems in the control of oxygen concentration. Traditional adjustment methods often rely on preset oxygen concentration values, lack dynamic feedback and real-time adjustment mechanisms.

[0004] Therefore, how to achieve appropriate and constant oxygen supply for patients throughout the entire respiratory cycle through precise and stable control technology is a technical problem that needs to be solved in the field. SUMMARY

[0005] To solve the above technical problems, the application provides the following technical solutions:

[0006] In a first aspect, the application provides a control method of a high-frequency jet respirator system, comprising:

[0007] The first flow sensor and the second flow sensor are used to acquire the oxygen flow and air flow in the oxygen gas circuit and the air gas circuit, respectively;

[0008] The oxygen concentration monitoring system is used to monitor the current oxygen concentration in the air-oxygen mixing device in real time;

[0009] After comparing the monitored current oxygen concentration with the target oxygen concentration, the optimal oxygen concentration prediction model is used to determine the oxygen output parameter and the air output parameter;

[0010] The air proportional valve, the oxygen proportional valve and the mixed gas proportional valve are controlled according to the determined oxygen output parameter and air output parameter, so as to realize stable control of the target oxygen amount.

[0011] In a possible implementation manner, the first flow sensor and the second flow sensor are used to acquire the oxygen flow and air flow in the oxygen gas circuit and the air gas circuit, respectively, comprising:

[0012] The oxygen output by the first controllable pressure gas source is filtered by a gas source filter and then input into an oxygen gas circuit;

[0013] The air output by the second controllable pressure gas source is filtered by a gas source filter and then input into an air gas circuit;

[0014] The oxygen flow and air flow in the oxygen gas circuit and the air gas circuit are acquired by the first flow sensor and the second flow sensor respectively.

[0015] In a possible implementation, after comparing the monitored current oxygen concentration with the target oxygen concentration, the oxygen output parameter and the air output parameter are determined by an optimal oxygen concentration prediction model, which includes:

[0016] A plurality of groups of oxygen proportional valve parameters, air proportional valve parameters and post-mixing oxygen concentration parameters are collected in advance;

[0017] The collected plurality of groups of data are input into a convolutional neural network for training to form the optimal oxygen concentration prediction model;

[0018] When there is an error in comparison between the monitored current oxygen concentration and the target oxygen concentration, the target oxygen concentration is input into the optimal oxygen concentration prediction model;

[0019] The oxygen output parameter and the air output parameter are determined by the optimal oxygen concentration prediction model.

[0020] In a possible implementation, the air proportional valve, the oxygen proportional valve and the post-mixing gas proportional valve are regulated according to the determined oxygen output parameter and air output parameter to achieve stable control of the target oxygen amount, which includes:

[0021] The total flow demand of the high-frequency jet ventilator system is acquired;

[0022] The air proportional valve, the oxygen proportional valve and the post-mixing gas proportional valve are regulated according to the determined oxygen output parameter, air output parameter and total flow demand of the high-frequency jet ventilator system to achieve stable control of the target oxygen amount.

[0023] In a possible implementation, the air proportional valve, the oxygen proportional valve and the post-mixing gas proportional valve are regulated according to the determined oxygen output parameter, air output parameter and total flow demand of the high-frequency jet ventilator system to achieve stable control of the target oxygen amount, which includes:

[0024] When the total flow demand of the high-frequency jet ventilator system remains unchanged, if the current oxygen concentration is higher than the target oxygen concentration, the proportional opening of the oxygen proportional valve is controlled to decrease and the proportional opening of the air proportional valve is controlled to increase by the driver;

[0025] Or,

[0026] If the current oxygen concentration is lower than the target oxygen concentration, the proportional opening of the oxygen proportional valve is increased and the proportional opening of the air proportional valve is decreased by the driver control;

[0027] When the total flow demand of the high-frequency jet ventilator system is reduced, if the current oxygen concentration is higher than the target oxygen concentration, the proportional opening of the mixed gas proportional valve and the proportional opening of the oxygen proportional valve are respectively controlled to be decreased and the proportional opening of the air proportional valve is unchanged by the driver control;

[0028] Or,

[0029] If the current oxygen concentration is lower than the target oxygen concentration, the proportional opening of the mixed gas proportional valve and the proportional opening of the air proportional valve are respectively controlled to be decreased and the proportional opening of the oxygen proportional valve is unchanged by the driver control;

[0030] When the total flow demand of the high-frequency jet ventilator system is increased, if the current oxygen concentration is higher than the target oxygen concentration, the proportional opening of the mixed gas proportional valve and the proportional opening of the air proportional valve are respectively controlled to be increased and the proportional opening of the oxygen proportional valve is unchanged by the driver control;

[0031] Or,

[0032] If the current oxygen concentration is lower than the target oxygen concentration, the proportional opening of the mixed gas proportional valve and the proportional opening of the oxygen proportional valve are respectively controlled to be increased and the proportional opening of the air proportional valve is unchanged by the driver control.

[0033] In a second aspect, the embodiments of the present application provide a high-frequency jet ventilator system, comprising:

[0034] A main controller and a ventilation control system, an oxygen concentration monitoring system, a feedback adjustment system, an alarm system and a jet needle electrically connected to the main controller;

[0035] The ventilation control system is used to ensure the normal jetting of oxygen and air in the ventilator;

[0036] The oxygen concentration monitoring system is used to monitor the oxygen concentration in the jetting process in real time;

[0037] The feedback adjustment system is used to adjust the oxygen supply flow and the jetting frequency to ensure that the oxygen concentration output by the ventilator is always maintained within a set range;

[0038] The alarm system is used to issue an alarm prompt for abnormal conditions occurring during the operation of the ventilator.

[0039] In a possible implementation, the ventilation control system comprises an oxygen gas circuit, an air gas circuit and a mixed gas circuit, the output ends of the oxygen gas circuit and the air gas circuit are connected to the input end of the mixed gas circuit, and the output end of the mixed gas circuit is connected to the outlet of the main controller.

[0040] In a possible implementation, the oxygen gas circuit is connected to a first controllable pressure gas source, the output end of the first controllable pressure gas source is connected to the input end of a first gas source filter, the output end of the first gas source filter is connected to the first end of a first pressure sensor and the first end of a first pressure reducer respectively, the second end of the first pressure reducer is connected to the first end of an oxygen proportional valve, the second end of the oxygen proportional valve is connected to the first end of a first flow sensor, and the second end of the first flow sensor is connected to the first end of an air-oxygen mixing device.

[0041] In a possible implementation, the air gas circuit is connected to a second controllable pressure gas source, the output end of the second controllable pressure gas source is connected to the input end of a second gas source filter, the output end of the second gas source filter is connected to the first end of a second pressure sensor and the first end of a second pressure reducer respectively, the second end of the second pressure reducer is connected to the first end of an air proportional valve, the second end of the air proportional valve is connected to the first end of a second flow sensor, and the second end of the second flow sensor is connected to the first end of the air-oxygen mixing device.

[0042] Compared with the prior art, the application has the following beneficial effects:

[0043] The application can dynamically track the oxygen concentration in the spraying process through the oxygen concentration real-time monitoring system, and accurately record the change trend in each breathing cycle, thereby providing data support for subsequent adjustment.

[0044] The application forms an optimal oxygen concentration prediction model through a convolutional neural network, calculates the most appropriate adjustment amount through the model, adjusts the oxygen supply flow and the spraying frequency in a timely manner, and ensures that the oxygen concentration output by the ventilator is always maintained within the set safe range. BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1 A schematic diagram of the whole high-frequency jet ventilator system is provided for the embodiment of the application;

[0046] Figure 2 A schematic diagram of the internal structure of the high-frequency jet ventilator system is provided for the embodiment of the application;

[0047] Figure 3 A flowchart of the control method of the high-frequency jet ventilator system is provided for the embodiment of the application;

[0048] Figure 4 a convolutional neural network training diagram provided for an embodiment of the present application;

[0049] Figure 5 a control system schematic diagram based on a convolutional neural network provided for an embodiment of the present application. DETAILED DESCRIPTION

[0050] The present scheme will be described below in conjunction with the accompanying drawings and specific embodiments.

[0051] Figure 1 A schematic diagram of a high-frequency jet ventilator system provided for an embodiment of the present application is shown in FIG. 1. Figure 1 The high-frequency jet ventilator system in the embodiment includes a main controller, and a ventilation control system, an oxygen concentration monitoring system, a feedback adjustment system, an alarm system, and a jet needle electrically connected to the main controller. The ventilation control system is used to ensure the normal injection of oxygen and air in the ventilator. The oxygen concentration monitoring system is used to monitor the oxygen concentration in the injection process in real time. The feedback adjustment system is used to adjust the oxygen supply flow and the injection frequency, so as to ensure that the oxygen concentration output by the ventilator is always maintained within a set range. The alarm system is used to issue an alarm prompt for abnormal conditions occurring during the operation of the ventilator.

[0052] Referring to FIG. 1, Figure 2 In the embodiment, the ventilation control system includes an oxygen gas path, an air gas path, and a mixed gas path. The output ends of the oxygen gas path and the air gas path are connected to the input end of the mixed gas path, and the output end of the mixed gas path is connected to the outlet of the main controller.

[0053] Specifically, the air inlet end of the oxygen gas path is connected to a first controllable pressure gas source. The output end of the first controllable pressure gas source is connected to the input end of a first gas source filter. The output end of the first gas source filter is connected to the first end of a first pressure sensor and the first end of a first pressure reducer. The second end of the first pressure reducer is connected to the first end of an oxygen proportional valve. The second end of the oxygen proportional valve is connected to the first end of a first flow sensor. The second end of the first flow sensor is connected to the first end of an air-oxygen mixing device. The air inlet end of the air gas path is connected to a second controllable pressure gas source. The output end of the second controllable pressure gas source is connected to the input end of a second gas source filter. The output end of the second gas source filter is connected to the first end of a second pressure sensor and the first end of a second pressure reducer. The second end of the second pressure reducer is connected to the first end of an air proportional valve. The second end of the air proportional valve is connected to the first end of a second flow sensor. The second end of the second flow sensor is connected to the first end of the air-oxygen mixing device.

[0054] The feedback adjustment system in the embodiment is built-in with a convolutional neural network, which, in cooperation with the oxygen concentration monitoring system, realizes intelligent and stable oxygen concentration control.

[0055] In the embodiment, the filtered air and oxygen pressure are maintained in the range of 400-1000 Kpa, and it is determined that the air and oxygen pressure in the range can enter the system. After passing through the proportional valve, the proportional valve adjusts the proportional opening according to the current oxygen concentration and the target oxygen concentration. The control of the proportional opening relies on the duty cycle of the driving PWM wave for adjustment, and relies on the concentration difference between the target concentration and the current concentration for proportional adjustment and division. The flow sensor obtains the current gas flow, and adjusts the flow to the target flow according to the difference from the target flow.

[0056] Corresponding to the high-frequency jet ventilator system provided in the above embodiment, the application further provides an embodiment of a control method of a high-frequency jet ventilator system.

[0057] Referring to Figure 3 The embodiment provides a flowchart of a control method of a high-frequency jet ventilator system. The control method of the high-frequency jet ventilator system includes the following steps.

[0058] S101, acquiring oxygen flow and air flow in the oxygen gas path and the air gas path through the first flow sensor and the second flow sensor respectively.

[0059] In the embodiment, the oxygen output by the first controllable pressure gas source is filtered through the gas source filter and then input into the oxygen gas path, and the air output by the second controllable pressure gas source is filtered through the gas source filter and then input into the air gas path. The oxygen flow and the air flow in the oxygen gas path and the air gas path are acquired through the first flow sensor and the second flow sensor respectively.

[0060] S102, monitoring the current oxygen concentration in the air-oxygen mixing device in real time by using an oxygen concentration monitoring system.

[0061] The oxygen concentration monitoring system in the embodiment adopts a monitoring system integrated with an oxygen concentration sensor and a microprocessor, which can measure and feedback the oxygen concentration in the airway in real time during the high-frequency jet process.

[0062] S103, determining the oxygen output parameter and the air output parameter by the optimal oxygen concentration prediction model after comparing the monitored current oxygen concentration with the target oxygen concentration.

[0063] Referring to Figure 4In this embodiment, according to the optimization method of the convolutional neural network, an optimization algorithm based on adaptive matrix estimation gradient descent is used to optimize the weights and biases of the three-layer convolutional neural network deep learning neurons, and the optimal control effect is calculated. According to the target oxygen concentration and flow, the optimal oxygen concentration prediction model is used to obtain the optimal control signals of the oxygen gas path and the air gas path. 1000 groups of oxygen proportional valve parameters, air proportional valve parameters and mixed oxygen concentration parameters are collected in advance as input data, and the collected multiple groups of data are input into the convolutional neural network for training to form an optimal oxygen concentration prediction model, thereby ensuring that the output oxygen concentration is consistent with the target oxygen concentration. When the error exists after comparing the monitored current oxygen concentration with the target oxygen concentration, the target oxygen concentration is input into the optimal oxygen concentration prediction model to determine the oxygen output parameters and the air output parameters.

[0064] In this embodiment, the convolutional layer is used to convolve the input data and extract the feature values of the sample data, the Relu activation function is used to reduce overfitting, and the full connection layer is used to combine the convolutional data part to form an output model. The training process of the convolutional neural network of the system includes forward propagation and backward propagation. The forward propagation calculates the input data from the bottom layer to the high layer, and the input of each layer of data is the output of the previous layer. The backward propagation calculates the gradient of the convolutional neural network, and updates the parameters of the convolutional neural network using the adaptive matrix estimation gradient descent algorithm according to the calculated gradient, so as to minimize the loss function.

[0065] In the convolutional neural network calculation process, the mean square error loss function is used as the loss calculation method, y i is the true value (the control signal parameters of the oxygen and air gas paths), y i is the model prediction value, n is the sample number of samples, and MSE is the loss value.

[0066]

[0067] S104, according to the determined oxygen output parameters and air output parameters, the air proportional valve, the oxygen proportional valve and the mixed gas proportional valve are regulated to realize the stable control of the target oxygen amount.

[0068] In this embodiment, the oxygen output parameter and the oxygen proportional valve opening degree are one-to-one corresponding, and the air output parameter and the air proportional valve opening degree are one-to-one corresponding. The convolutional neural network can form a concentration control according to the concentration adjustment opening degree. Referring to Figure 5In the embodiment, the total flow demand of the high-frequency jet ventilator system is acquired, and the air proportional valve, the oxygen proportional valve and the mixed gas proportional valve are controlled according to the determined oxygen output parameter, the air output parameter and the total flow demand, so as to realize stable control of the target oxygen amount. When the total flow demand of the high-frequency jet ventilator system remains unchanged, if the current oxygen concentration is higher than the target oxygen concentration, the proportional opening of the oxygen proportional valve is controlled to decrease by the driver, and the proportional opening of the air proportional valve is controlled to increase; if the current oxygen concentration is lower than the target oxygen concentration, the proportional opening of the oxygen proportional valve is controlled to increase by the driver, and the proportional opening of the air proportional valve is controlled to decrease.

[0069] When the total flow demand of the high-frequency jet ventilator system decreases, if the current oxygen concentration is higher than the target oxygen concentration, the proportional opening of the mixed gas proportional valve and the proportional opening of the oxygen proportional valve are controlled to decrease by the driver, and the proportional opening of the air proportional valve remains unchanged; if the current oxygen concentration is lower than the target oxygen concentration, the proportional opening of the mixed gas proportional valve and the proportional opening of the air proportional valve are controlled to decrease by the driver, and the proportional opening of the oxygen proportional valve remains unchanged.

[0070] When the total flow demand of the high-frequency jet ventilator system increases, if the current oxygen concentration is higher than the target oxygen concentration, the proportional opening of the mixed gas proportional valve and the proportional opening of the air proportional valve are controlled to increase by the driver, and the proportional opening of the oxygen proportional valve remains unchanged; if the current oxygen concentration is lower than the target oxygen concentration, the proportional opening of the mixed gas proportional valve and the proportional opening of the oxygen proportional valve are controlled to increase by the driver, and the proportional opening of the air proportional valve remains unchanged.

[0071] In the embodiments of the present application, "multiple" refers to two or more than two. "And / or" describes the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can represent the cases of A alone, A and B together, and B alone. Wherein A and B can be singular or plural. The character " / " generally represents that the front and rear associated objects are in an "or" relationship.

[0072] It should be noted that in this paper, the term "includes", "contains" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or includes elements inherent to such process, method, article or equipment. Without more limitation, the element defined by the sentence "includes a…" does not exclude the presence of another identical element in the process, method, article or equipment including the element.

[0073] The above description is only the specific implementation of the present application. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the present application, which should be covered in the protection range of the present application. The protection range of the present application should be subject to the protection range of the claims.

Claims

1. A high frequency jet ventilator system, characterized by The utility model relates to a high-frequency jet ventilator system, including: a main controller and a ventilation control system, an oxygen concentration monitoring system, a feedback adjustment system, an alarm system and a jet needle electrically connected to the main controller; the ventilation control system is used for ensuring the normal jet of oxygen and air in the breathing machine; the oxygen concentration monitoring system is used for monitoring the oxygen concentration in the jet process in real time; the feedback adjustment system is used for adjusting the oxygen supply flow and the jet frequency, ensuring that the oxygen concentration output by the breathing machine is always maintained within the set range, including: after comparing the monitored current oxygen concentration with the target oxygen concentration, the oxygen output parameter and the air output parameter are determined through the optimal oxygen concentration prediction model, including: a plurality of oxygen proportional valve parameters, air proportional valve parameters and mixed oxygen concentration parameters are collected in advance; the collected multiple groups of data are input into the convolutional neural network for training to form the optimal oxygen concentration prediction model; when there is an error after comparing the monitored current oxygen concentration with the target oxygen concentration, the target oxygen concentration is input into the optimal oxygen concentration prediction model; the oxygen output parameter and the air output parameter are determined through the optimal oxygen concentration prediction model; the air proportional valve, the oxygen proportional valve and the mixed gas proportional valve are regulated according to the determined oxygen output parameter and air output parameter to realize stable control of the target oxygen amount, including: obtaining the total flow demand jetted by the high-frequency jet ventilator system; the air proportional valve, the oxygen proportional valve and the mixed gas proportional valve are regulated according to the determined oxygen output parameter, air output parameter and total flow demand jetted to realize stable control of the target oxygen amount, including: when the total flow demand jetted by the high-frequency jet ventilator system remains unchanged, if the current oxygen concentration is higher than the target oxygen concentration, the proportional opening of the oxygen proportional valve is reduced and the proportional opening of the air proportional valve is increased through the driver; or, if the current oxygen concentration is lower than the target oxygen concentration, the proportional opening of the oxygen proportional valve is increased and the proportional opening of the air proportional valve is reduced through the driver; when the total flow demand jetted by the high-frequency jet ventilator system decreases, if the current oxygen concentration is higher than the target oxygen concentration, the proportional opening of the mixed gas proportional valve and the proportional opening of the oxygen proportional valve are reduced and the proportional opening of the air proportional valve remains unchanged through the driver; or, if the current oxygen concentration is lower than the target oxygen concentration, the proportional opening of the mixed gas proportional valve and the proportional opening of the air proportional valve are reduced and the proportional opening of the oxygen proportional valve remains unchanged through the driver; when the total flow demand jetted by the high-frequency jet ventilator system increases, if the current oxygen concentration is higher than the target oxygen concentration, the proportional opening of the mixed gas proportional valve and the proportional opening of the air proportional valve are increased and the proportional opening of the oxygen proportional valve remains unchanged through the driver; or, if the current oxygen concentration is lower than the target oxygen concentration, the proportional opening of the mixed gas proportional valve and the proportional opening of the oxygen proportional valve are increased and the proportional opening of the air proportional valve remains unchanged through the driver; The alarm system is used for sending alarm prompt for abnormal situation occurred during the operation of the breathing machine.

2. The high frequency jet ventilator system of claim 1, wherein, The ventilation control system comprises an oxygen gas circuit, an air gas circuit and a mixed gas circuit, the output ends of the oxygen gas circuit and the air gas circuit are communicated with the input end of the mixed gas circuit, and the output end of the mixed gas circuit is communicated with the outlet of the main controller.

3. The high-frequency jet ventilator system of claim 2, wherein, The input end of the oxygen gas circuit is connected with a first controllable pressure gas source, the output end of the first controllable pressure gas source is communicated with the input end of a first gas source filter, the output end of the first gas source filter is connected with the first end of a first pressure sensor and a first pressure reducer respectively, the second end of the first pressure reducer is connected with the first end of an oxygen proportional valve, the second end of the oxygen proportional valve is connected with the first end of a first flow sensor, and the second end of the first flow sensor is connected with the first end of an air-oxygen mixing device.

4. The high-frequency jet ventilator system of claim 2 or 3, wherein, The input end of the air gas circuit is connected with a second controllable pressure gas source, the output end of the second controllable pressure gas source is communicated with the input end of a second gas source filter, the output end of the second gas source filter is connected with the first end of a second pressure sensor and a second pressure reducer respectively, the second end of the second pressure reducer is connected with the first end of an air proportional valve, the second end of the air proportional valve is connected with the first end of a second flow sensor, and the second end of the second flow sensor is connected with the first end of the air-oxygen mixing device.

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