WO2021093842A1

WO2021093842A1 - Subglottic suction system and control method thereof

Info

Publication number: WO2021093842A1
Application number: PCT/CN2020/128609
Authority: WO
Inventors: 李维; 李小苗
Original assignee: 北京雅果科技有限公司
Priority date: 2019-11-14
Filing date: 2020-11-13
Publication date: 2021-05-20
Also published as: CN110755705A

Abstract

A subglottic suction system (100) and a control method thereof, the subglottic suction system (100) comprising: a secretion collection apparatus (110), used to collect secretions suctioned from the subglottis of a patient by means of a suction tube; a pressure component (120), used to provide negative pressure to the suction tube, and to perform adjustment of a magnitude of the provided negative pressure according to a pressure adjustment signal; a sensing unit (130) used to monitor flow volume and/or pressure in the suction tube in real time, obtaining monitoring data; a control unit (140) connected separately to the pressure component (120) and the sensing unit (130), used to receive the monitoring data and generate a pressure adjustment signal according to the monitoring data, send the pressure adjustment signal to the pressure component, and also to perform calculation, determination and decision according to the monitoring data, controlling suction of the suction system.

Description

Subglottic suction system and control method thereof

Cross-references to related applications

This application is filed based on the Chinese patent application with the application number 201911112220.2 and the application date on November 14, 2019, and claims the priority of the above-mentioned Chinese patent application. The entire content of the above-mentioned Chinese patent application is hereby incorporated into this application by reference.

Technical field

This application relates to the field of medical auxiliary equipment, and in particular to a subglottic suction system and a control method thereof.

Background technique

Mechanical ventilation, as one of the main measures for the rescue of critically ill patients, has been widely used in clinics, especially in intensive care units. However, the subsequent ventilator associated pneumonia (VAP) related to its application has become a common and frequent clinical practice. Severe complications, once a patient develops VAP, it is easy to cause difficulty in weaning, thereby prolonging the hospital stay, increasing the hospitalization cost, and even threatening the life of the patient and leading to the death of the patient. Aspiration of oral secretions into the lower respiratory tract through artificial airway balloons is an important way to cause VAP. Taking effective preventive measures such as subglottic suction is an important method to control the epidemic of VAP and reduce its mortality.

At present, there are two main ways of clinical subglottic attraction, namely continuous subglottic attraction and intermittent subglottic attraction. Continuous subglottic suction is to connect the sputum drainage tube to the negative pressure suction device, and use constant negative pressure to continuously suck. The advantage of this method is that it can prevent the retention of secretions above the air sac. The disadvantage is that it is easy to cause drying and bleeding of the respiratory mucosa. infection. Intermittent subglottic suction is intermittent suction with constant negative pressure. This method can make the mucosa above the airbag fully rest, and the airway temperature and humidity will change little, alleviate the damage of negative pressure to the mucosa, and avoid the disadvantages of continuous subglottic suction. . However, the current intermittent subglottic suction is mainly done manually by nurses, such as intermittent suction using a syringe. This manual method will greatly increase the workload of medical staff and cannot guarantee sufficient frequency of attraction. At the same time, because the amount of secretions on the capsule cannot be directly observed, it is difficult to determine the timing of suction and to monitor the quality of suction care, which may lead to insufficient suction care on the capsule.

Based on the above, the existing subglottic suction method increases the manual workload, and there is a problem that the control timing cannot be determined.

The above-mentioned shortcomings are expected to be overcome by those skilled in the art.

Summary of the invention

This application aims to solve at least one of the technical problems existing in the prior art.

(1) Technical problems to be solved

In order to solve the above-mentioned problems of the related art, the present application provides a subglottic suction system and a control method thereof to solve the problem that the subglottic suction method in the related art increases the manual workload and cannot determine the control timing.

Other characteristics and advantages of the present application will become apparent through the following detailed description, or partly learned through the practice of the present application.

(2) Technical solution

In order to achieve the above objectives, the main technical solutions adopted in this application include:

In one aspect, an embodiment of the present application provides a subglottic suction system, which includes: a secretion collection device for collecting secretions sucked from the patient's subglottis through a suction tube; a pressure part, and the suction tube Connection, used to provide negative pressure for the suction pipe, and adjust the magnitude of the negative pressure provided according to the pressure adjustment signal; a sensing unit, connected to the suction pipe, for real-time control of the suction pipe The flow and/or pressure in the road are monitored to obtain monitoring data; a control unit, connected to the pressure part and connected to the sensing unit, for receiving the monitoring data and generating the pressure adjustment based on the monitoring data Signal, the pressure adjustment signal is sent to the pressure part, and the suction of the suction system is controlled according to the calculation, judgment and decision-making of the monitoring data.

In an embodiment of the present application, it further includes: an on-off valve, connected between the pressure part and the suction pipe, for controlling whether the pressure part is directed to the suction pipe according to the opening or closing of the on-off valve. Negative pressure is introduced into the pipeline.

In an embodiment of the present application, the on-off valve is also connected to the control unit for controlling the on-off valve to open according to an opening instruction from the control unit, and controlling the on-off valve according to a closing instruction from the control unit. The on-off valve is closed.

On the other hand, the embodiment of the present application also provides a method for controlling the subglottic suction system, which includes: monitoring the flow and/or pressure in the suction pipeline in real time to obtain monitoring data; and calculating, according to the monitoring data, Judgment and decision-making, control the suction of the suction system, and generate a pressure adjustment signal according to the monitoring data, and send the pressure adjustment signal to the pressure part; and perform the magnitude of the negative pressure provided according to the pressure adjustment signal adjust.

In an embodiment of the present application, the subglottic suction system includes an on-off valve, which is connected between the pressure part and the suction pipeline, and is used to control the station according to the opening or closing of the on-off valve. Whether the pressure part passes negative pressure to the suction pipeline, the calculation, judgment, and decision based on the monitoring data, controlling the suction of the suction system, and generating a pressure adjustment signal according to the monitoring data includes: controlling The subglottic suction system works in manual mode, timing mode, or automatic mode and performs mode switching; in the manual mode, the suction time and the suction interval are determined according to the operator's operation of the on-off valve, and continue Suction or intermittent suction; in the timing mode, the opening and closing instructions are sent to the on-off valve according to the preset suction time and the suction interval time, and the suction is performed at a time; in the automatic mode, according to the monitoring data The pressure adjustment signal is generated in combination with a preset threshold, and an opening command or a closing command is generated to control the on-off valve and automatically attract.

In an embodiment of the present application, the monitoring data includes flow data and/or pressure data, and the automatic mode includes a trial suction phase and a formal suction phase.

In an embodiment of the present application, in the automatic mode, the method further includes: judging jointly based on the flow data and the pressure data, and controlling the start and end of the trial suction phase and the formal suction phase Or judge according to at least one of the flow data and the pressure data, and control the start and end of the trial suction phase and the formal suction phase.

In an embodiment of the present application, the joint judgment based on the flow data and the pressure data, and controlling the start and end of the trial suction phase and the formal suction phase includes: sending to the on-off valve Open the command, open the on-off valve, and the trial suction phase begins. When the product of the pressure data and the inverse of the flow data is greater than or equal to the first preset threshold, enter the formal suction phase, otherwise the trial suction phase The suction phase ends; in the formal suction phase, when the product of the pressure data and the reciprocal of the flow data is less than the second preset threshold, a closing instruction is issued to the on-off valve, and the formal suction phase End, wherein the first preset threshold is greater than the second preset threshold.

In an embodiment of the present application, the joint judgment based on the flow data and the pressure data, and controlling the start and end of the trial suction phase and the formal suction phase includes: sending to the on-off valve The opening instruction is to open the on-off valve, and the suction test phase begins. When the integral of the product of the pressure data and the reciprocal of the flow data in the preset time period is greater than the third preset threshold, the formal suction is entered. The suction phase, otherwise the test suction phase ends.

In an embodiment of the present application, the judging based on at least one of the flow data and the pressure data, and controlling the start and end of the trial suction phase and the formal suction phase includes: The on-off valve sends an opening instruction to open the on-off valve and enter the suction test phase. When the pressure data is less than the first pressure threshold and/or the flow data is greater than the first flow threshold, the suction test is stopped; When the pressure data is greater than the first pressure threshold and/or the flow data is less than the first flow data, enter the formal suction phase; in the formal suction phase, when the pressure data is less than the second pressure threshold And/or when the flow data is greater than the second flow threshold, a closing instruction is issued to the on-off valve, and the formal suction phase ends, wherein the first pressure threshold is greater than the second pressure threshold, and the first flow threshold Less than the second flow threshold.

(3) Beneficial effects

The beneficial effects of this application are: the subglottic suction system and its control method provided by the embodiments of this application are performed by monitoring the flow and/or pressure of the suction line connecting the patient and the secretion collection device in the subglottic suction system. Monitor, and then control and adjust the working conditions of the suction system according to the monitoring results. The suction operation on the capsule can be automatically completed, and the suction can be automatically activated by detecting the amount of secretions accumulated under the glottis of the patient, which not only reduces the labor intensity of the nurse, but also It can protect the patient's respiratory mucosa, and also ensure sufficient suction frequency and suction quality.

Description of the drawings

The above and/or additional aspects and advantages of the present application will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, in which:

Figure 1 is a schematic diagram of a subglottic suction system according to an embodiment of the application;

FIG. 2 is a schematic diagram of the connection relationship when the subglottic suction system works in an embodiment of the application;

Fig. 3 is a flowchart of a control method of a subglottic suction system according to another embodiment of the application.

Detailed ways

In order to better explain the application and facilitate understanding, the application will be described in detail below through specific implementations in conjunction with the drawings.

All technical and scientific terms used herein have the same meanings as commonly understood by those skilled in the technical field of this application. The terminology used in the specification of the application herein is only for the purpose of describing specific embodiments, and is not intended to limit the application. The term "and/or" as used herein includes any and all combinations of one or more related listed items.

FIG. 1 is a schematic diagram of a subglottic suction system provided by an embodiment of the application. As shown in FIG. 1, the system 100 (that is, the subglottic suction system) includes: a secretion collection device 110, a pressure part 120, and a sensing unit 130 and control unit 140.

The secretion collection device 110 is used to collect secretions sucked from the patient's subglottis through a suction pipeline; the pressure part 120 is connected to the suction pipeline and is used to provide negative pressure for the suction pipeline, and to provide negative pressure to the suction pipeline according to the pressure regulation signal. The sensing unit 130 is connected to the suction pipeline to monitor the flow and/or pressure in the suction pipeline in real time to obtain monitoring data; the control unit 140 is connected to the pressure unit 120 and senses The unit 130 is connected (the control unit 140 is connected to the pressure unit 120 and the sensing unit 130 respectively), and is used to receive monitoring data and generate a pressure adjustment signal according to the monitoring data, send the pressure adjustment signal to the pressure unit 120, and calculate, Judgment and decision-making, to control the suction of the suction system.

In an embodiment of the present application, the system 100 further includes: an on-off valve (not shown in the figure). The on-off valve is connected between the pressure part 120 and the suction pipe for controlling the pressure part according to the opening or closing of the on-off valve. Whether to pass negative pressure to the suction pipeline.

In an embodiment of the present application, the on-off valve is also connected to the control unit 140 for controlling the on-off valve to open according to the opening instruction from the control unit 140 and controlling the on-off valve to close according to the closing instruction from the control unit 140.

The system of the embodiment shown in FIG. 1 is described in detail below:

Figure 2 is a schematic diagram of the connection relationship when a subglottic suction system of this application works. As shown in Figure 2, the secretion collection device 6 receives secretions from the patient through a suction pipe (not marked), and is set on the suction pipe The sensing unit 5 is connected to the control unit 3. As shown in Figure 2, the pressure part includes a negative pressure source 1 and a pressure regulating unit 2. The negative pressure source 1 is used to provide negative pressure with suction power; the pressure regulating unit 2 is connected to the negative pressure source 1 and the control unit 3, It is used to adjust the magnitude of the negative pressure provided by the negative pressure source 1 according to the pressure adjustment signal from the control unit 3. In addition, an on-off valve 4 is also provided on the connecting pipeline between the pressure regulating unit 2 and the suction pipeline.

In an embodiment of the present application, the negative pressure source 1 in FIG. 2 provides suction power for the entire subglottic suction system, which can be an independent vacuum pump, such as a piston, rotary vane, or water ring vacuum pump, or It is a negative pressure turbine, it can also be a central suction system configured on the treatment belt of a hospital ward, or a commercially available sputum suction device that can generate negative pressure.

In an embodiment of the present application, the pressure adjusting unit 2 in FIG. 2 can adjust the magnitude of the negative pressure value output by the negative pressure source, and keep the output negative pressure value dynamically stable, which can be a separate mechanical or electronic type The vacuum pressure regulating valve, or a combination of a vacuum regulating valve and a negative pressure tank. It can be adjusted manually, or receive a pressure adjustment signal from the control unit 3 for pressure adjustment, or it can be fed back to the control unit 3 for closed-loop control adjustment. If the negative pressure source 1 is independent, such as a vacuum pump or a fan, the pressure can also be adjusted directly by adjusting the speed of the drive motor in a closed loop.

In an embodiment of the present application, the control unit 3 in FIG. 2 is used to receive information such as external instructions or monitoring data of the sensing unit 5, and after processing, can send a signal for adjusting the pressure value to the pressure adjustment unit 2 (ie Pressure adjustment signal) to adjust the negative pressure; it is also possible to send instructions to the on-off valve 4 to control the on-off valve 4 to open or close, so as to start the attraction and stop the attraction.

In an embodiment of the present application, the on-off valve 4 in FIG. 2 may be a two-position, two-way solenoid valve, a pneumatic valve, an electric valve, or a manual on-off valve. The on-off valve 4 can be controlled by the control unit 3 to realize opening and closing through command control, or it can be manually opened and closed to control when to supply and stop supplying negative pressure to the suction pipeline.

In an embodiment of the present application, the sensing unit 5 in FIG. 2 monitors the pressure and/or flow rate in the suction pipeline. It can monitor the pressure through a pressure sensor, and use a flow sensor (or through measured different parts). Calculate the flow value based on the pressure value) to monitor the flow rate.

In an embodiment of the present application, the secretion collection device 6 in FIG. 2 collects secretions (such as sputum) sucked from the patient's glottis through the suction tube into a container, and after the accumulation reaches a certain amount, the nursing staff will act as Medical waste treatment.

In summary, based on the subglottic suction system provided by the embodiment of the present application, by adding the sensing unit 5, by monitoring the flow and/or pressure in the suction pipeline, the working condition of the suction system can be monitored according to the monitoring results. Control and adjustment, can automatically complete the suction operation on the capsule, and can automatically start the suction by detecting the amount of secretions accumulated under the glottis of the patient, which not only reduces the labor intensity of the nurse, but also protects the respiratory mucosa of the patient, and ensures sufficient suction frequency And attract quality.

The working modes of the subglottic suction system provided in the above embodiments include manual mode, timing mode and automatic mode. The control method provided in this application can switch between different modes, and can also perform continuous and intermittent suction to achieve Automatic and appropriate suction can not only reduce manual operation but also protect the patient's respiratory mucosa.

FIG. 3 is a flowchart of a method for controlling a subglottic suction system according to another embodiment of the application. As shown in FIG. 3, it specifically includes the following steps:

In step S310, the flow rate and/or pressure in the suction pipeline are monitored in real time to obtain monitoring data;

In step S320, control the suction of the suction system according to the monitoring data calculation, judgment and decision, generate a pressure adjustment signal according to the monitoring data, and send the pressure adjustment signal to the pressure part;

In step S330, the magnitude of the negative pressure provided is adjusted according to the pressure adjustment signal.

In an embodiment of the present application, in the control method, the subglottic suction system is controlled to work in manual mode, timing mode, or automatic mode, and to perform mode switching;

1) In the manual mode, the suction time and the suction interval are determined according to the operator's operation of the on-off valve, and continuous suction or intermittent suction is performed. For example, in the manual mode, the suction can be started by pressing the manual suction button and opening the on-off valve 4, and pressing it again will close the on-off valve 4 and the suction will stop. A single subglottic suction can be realized by manual operation, and the suction time and the suction interval time are determined by the time the operator presses the manual suction button twice next to each other to achieve intermittent suction. In addition, due to the operation control, continuous attraction can also be performed, that is, after the manual attraction start button is pressed, the manual attraction button is no longer pressed within a certain period of time, so as to achieve continuous attraction.

2) In the timing mode, the opening and closing instructions are sent to the on-off valve according to the preset suction time and the suction interval time, and the suction is carried out at a fixed time. For example, the control unit 3 is used to replace the function of manually pressing the suction button. The control unit 3 sets the suction duration and suction interval time by setting instructions. The instructions are applied to the on-off valve 4, and then according to the control unit 3 Send an opening command to open the on-off valve 4, and open and close the on-off valve according to the closing command to realize the timing control of the suction time and the suction interval. The timing control can be intermittent suction within a period of time, or continuous suction.

No matter in the manual mode or the timing mode, the sensor unit 5 does not participate in the operation of the system.

3) In the automatic mode, the pressure adjustment signal is generated according to the monitoring data combined with the preset threshold, and the opening instruction or the closing instruction is generated to control the on-off valve and automatically attract.

When the automatic mode is selected, the sensing unit 5 works after the test suction is started, and the obtained monitoring data includes flow data and/or pressure data. The system will periodically detect whether secretions have accumulated, and if so, the suction system will be activated.

In an embodiment of the present application, the automatic mode includes a test suction phase and a formal suction phase, that is, the general control flow is: open the on-off valve → enter the test suction phase → meet the condition one and stop the test suction → meet the condition two and enter Formal suction stage→Stop formal suction when condition 3 is met.

In an embodiment of the present application, in the suction test stage, an opening instruction and a closing instruction are sent to the on-off valve according to the preset test suction time period, and the test suction is performed.

In an embodiment of the present application, in the automatic mode, the following two situations are also included:

(1) Joint judgment based on flow data and pressure data, that is, when the sensor unit 5 detects pressure and flow and makes a judgment, the two parameters can be jointly judged at the same time to achieve control of the trial suction phase and the formal suction phase. Start and end; or

(2) Make judgments based on at least one of the flow data and pressure data, and control the start and end of the trial suction phase and the formal suction phase.

In an embodiment of the present application, the situation (1) specifically includes:

(1.1) Send an opening instruction to the on-off valve, open the on-off valve, and the test suction phase begins. When the product of the pressure data and the inverse of the flow data is greater than or equal to the first preset threshold, the formal suction phase is entered. Otherwise, the test suction phase ends. For example, in the trial suction phase, if the product (P/F) of the pressure value P and the reciprocal (1/F) of the flow value F detected by the sensing unit 5 reaches the first preset threshold R1, then the formal suction is entered Stage, otherwise stop the aspiration.

(1.2) In the formal suction phase, when the product of the pressure data and the reciprocal of the flow data is less than the second preset threshold, a closing command is issued to the on-off valve, and the formal suction phase ends, where the first preset The threshold is greater than the second preset threshold. For example, in the formal suction phase, the control unit 3 adjusts the suction pressure to an appropriate value and continues to suck, and the sensing unit 5 continues to detect the pressure/flow rate and sends the data to the control unit until the control unit 3 receives the sensing When the product of the pressure P sent by the unit 5 and the reciprocal (1/F) of the flow rate F is less than a threshold value R2, the control unit 3 sends a closing command to the on-off valve 4 to stop the suction. If it is manual mode, the negative pressure in the normal suction phase is determined by the operator; if it is automatic mode, the operator sets the maximum pressure through the control unit, and the control unit adjusts it from 0 to the maximum pressure. The principle of adjustment is The F flow rate reaches at least a certain threshold, for example, the threshold can be 2L/min.

In an embodiment of the present application, in case (1), in addition to the instantaneous value, the integral over a period of time may also be considered, which specifically includes:

Send an opening command to the on-off valve, open the on-off valve, and start the test suction phase. According to the product of the pressure data and the reciprocal of the flow data, when the integral in the preset time period is greater than the third preset threshold, the formal suction phase is entered , Otherwise the test suction phase ends. For example, the product of the above-mentioned pressure value P and the reciprocal (1/F) of the flow value F can be changed to the integral of the product of the pressure value P and the reciprocal (1/F) of the flow value F within a period of time T1, the formula is:

When the trial suction phase R>R3, enter the formal suction phase, otherwise stop the suction, where R3 is the accumulated product of the pressure and the flow rate for a period of time.

In the same way, in the formal suction phase, it is also possible to determine the end of the suction by calculating the integral of the product of the pressure value P and the reciprocal (1/F) of the flow value F within a period of time T1.

In this method, the cumulative value over a period of time is calculated, and then divided by the time to get the average value over a period of time. The average value obtained by solving is different from the instantaneous value of a single moment in the above situation.

In an embodiment of the present application, the sensing unit 5 may simultaneously detect pressure and flow rate for joint judgment, or may only detect pressure and/or flow rate for judgment, that is, situation (2) specifically includes:

(2.1) Send an opening instruction to the on-off valve, open the on-off valve, and enter the test suction stage. When the pressure data is less than the first pressure threshold and/or the flow data is greater than the first flow threshold, stop the test suction. For example, the control unit 3 regularly issues an opening instruction to the on-off valve 4 to open the on-off valve 4, and at the same time, the sensing unit 5 monitors the airflow data/pressure data in real time, and performs a test suction. When the pressure value P detected by the sensing unit 5 is lower than a pressure threshold value P1 and/or the detected flow rate is greater than a flow threshold value F1, the suction is stopped immediately.

(2.2) When the pressure data is greater than the first pressure threshold and/or the flow data is less than the first flow data, the formal suction phase is entered. For example, when the pressure value P detected by the sensing unit 5 is higher than the first pressure threshold P1 and/or the detected flow value F is lower than the first flow threshold F1, the formal suction phase is entered, and the control unit 3 Adjust the suction pressure to a suitable value and continue to suck. The maximum pressure is set by the control unit 3, and the control unit automatically adjusts to a suitable value within the range of 0 to the maximum pressure.

(2.3) In the formal suction phase, when the pressure data is less than the second pressure threshold and/or the flow data is greater than the second flow threshold, a closing instruction is issued to the on-off valve, and the formal suction phase ends, where the first The pressure threshold is greater than the second pressure threshold, and the first flow threshold is less than the second flow threshold. For example, in the formal suction phase, the sensor unit 5 continuously detects the pressure/flow rate and sends the monitoring data to the control unit 3 until the control unit 3 receives that the pressure value P sent by the sensor unit 5 is lower than the second pressure When the threshold P2 or/and the flow value F are higher than the second flow threshold F2, the control unit 3 issues a closing instruction to the on-off valve 4, and the suction stops.

It should be noted that the pressure and flow thresholds P1, P2, F1, and F2 in the above method may be preset or calculated based on pressure and flow detection values over a period of time. When making a judgment, the pressure value, flow value and each threshold value are all absolute values.

Finally, whether it is in manual mode, timing mode, or automatic mode, it involves the adjustment of suction pressure. The pressure adjustment in this application can be manual or automatic closed-loop adjustment of the vacuum pressure control valve or adjustment of the motor driving the negative pressure source. Rotation speed to achieve the desired pressure value.

In summary, using the method for controlling the subglottic suction system provided in the embodiments of the present application, by monitoring the flow or pressure in the suction pipeline, and controlling and adjusting the working conditions of the suction system according to the monitoring results, it can be automatically The suction operation on the capsule is completed, and the suction can be automatically activated by detecting the amount of secretions accumulated under the glottis of the patient, which not only reduces the labor intensity of the nurse, but also protects the respiratory mucosa of the patient, and also ensures sufficient suction frequency and suction quality.

It should be noted that although several modules or units of the device for action execution are mentioned in the above detailed description, this division is not mandatory. In fact, according to the embodiments of the present application, the features and functions of two or more modules or units described above may be embodied in one module or unit. Conversely, the features and functions of a module or unit described above can be further divided into multiple modules or units to be embodied.

Those skilled in the art will easily think of other embodiments of the present application after considering the specification and practicing the content disclosed herein. This application is intended to cover any variations, uses, or adaptive changes of this application. These variations, uses, or adaptive changes follow the general principles of this application and include common knowledge or customary technical means in the technical field that are not disclosed in this application. . The description and the embodiments are only regarded as exemplary, and the true scope and spirit of the application are pointed out by the above claims.

It should be understood that the present application is not limited to the precise structure that has been described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the application is only limited by the appended claims.

Claims

A subglottic attraction system, which includes:

The secretion collection device is used to collect secretions sucked from the patient's subglottis through the suction tube;

The pressure part is connected to the suction pipeline and is used to provide negative pressure for the suction pipeline, and adjust the magnitude of the negative pressure provided according to the pressure adjustment signal;

A sensing unit, connected to the suction pipeline, for real-time monitoring of the flow rate and/or pressure in the suction pipeline to obtain monitoring data;

A control unit connected to the pressure part and connected to the sensing unit, and configured to receive the monitoring data and generate the pressure adjustment signal according to the monitoring data, and send the pressure adjustment signal to the pressure part, According to the monitoring data calculation, judgment and decision-making, the suction of the suction system is controlled.
The subglottic suction system of claim 1, further comprising:

An on-off valve is connected between the pressure part and the suction pipeline, and is used to control whether the pressure part passes negative pressure to the suction pipeline according to the opening or closing of the on-off valve.
The subglottic suction system according to claim 2, wherein the on-off valve is further connected to the control unit for controlling the on-off valve to open according to an opening instruction from the control unit, and according to the control unit The unit's closing command controls the on-off valve to close.
A control method of the subglottic suction system, which includes:

Real-time monitoring of the flow and/or pressure in the suction pipeline to obtain monitoring data;

Calculate, judge and make decisions based on the monitoring data, control the suction of the suction system, generate a pressure adjustment signal according to the monitoring data, and send the pressure adjustment signal to the pressure part;

The magnitude of the negative pressure provided is adjusted according to the pressure adjustment signal.
The control method of the subglottic suction system according to claim 4, wherein the subglottic suction system includes an on-off valve connected between the pressure part and the suction pipeline for The opening or closing of the on-off valve controls whether the pressure part passes negative pressure to the suction pipeline, the calculation, judgment and decision-making based on the monitoring data, the control of the suction of the suction system, and the Pressure regulation signals generated by monitoring data include:

Controlling the subglottic suction system to work in manual mode, timing mode or automatic mode and to switch modes;

In the manual mode, the suction time and the suction interval are determined according to the operator's operation of the on-off valve, and continuous suction or intermittent suction is performed;

In the timing mode, sending an opening instruction and a closing instruction to the on-off valve according to the preset suction time and the suction interval time, and suction is performed at a fixed time;

In the automatic mode, the pressure adjustment signal is generated according to the monitoring data in combination with a preset threshold, and an opening command or a closing command is generated to control the on-off valve, and suction is automatically performed.
The control method of the subglottic suction system according to claim 5, wherein the monitoring data includes flow data and/or pressure data, and the automatic mode includes a trial suction phase and a formal suction phase.
The control method of the subglottic suction system according to claim 6, wherein, in the automatic mode, further comprising:

Jointly judge based on the flow data and the pressure data, and control the start and end of the trial suction phase and the formal suction phase; or

The judgment is made according to at least one of the flow data and the pressure data, and the start and end of the trial suction phase and the formal suction phase are controlled.
The control method of the subglottic suction system according to claim 7, wherein the joint judgment is made based on the flow data and the pressure data to control the start of the trial suction phase, the formal suction phase, and The end includes:

Send an opening instruction to the on-off valve, open the on-off valve, and the test suction phase begins. When the product of the pressure data and the inverse of the flow data is greater than or equal to the first preset threshold, the formal suction is entered. Suction phase, otherwise the test suction phase ends;

In the formal suction phase, when the product of the pressure data and the reciprocal of the flow rate data is less than a second preset threshold, a closing instruction is issued to the on-off valve, and the formal suction phase ends, where all The first preset threshold is greater than the second preset threshold.
The control method of the subglottic suction system according to claim 7, wherein the joint judgment is made based on the flow data and the pressure data to control the start of the trial suction phase, the formal suction phase, and The end includes:

Send an opening instruction to the on-off valve, open the on-off valve, and start the suction test phase. According to the product of the pressure data and the reciprocal of the flow data, the integral within the preset time period is greater than the third preset When the threshold is reached, the formal suction phase is entered, otherwise the trial suction phase ends.
The method for controlling a subglottic suction system according to claim 7, wherein the judgment is made based on at least one of the flow data and the pressure data, and the trial suction phase and the formal suction phase are controlled. The beginning and end of include:

Send an opening instruction to the on-off valve, open the on-off valve, and enter the suction test phase, and stop the suction test when the pressure data is less than the first pressure threshold and/or the flow data is greater than the first flow threshold;

When the pressure data is greater than the first pressure threshold and/or the flow data is less than the first flow data, enter the formal suction phase;

In the formal suction phase, when the pressure data is less than the second pressure threshold and/or the flow data is greater than the second flow threshold, a closing instruction is issued to the on-off valve, and the formal suction phase ends, where The first pressure threshold is greater than the second pressure threshold, and the first flow threshold is less than the second flow threshold.