CN110755705A

CN110755705A - Subglottic attraction system and control method thereof

Info

Publication number: CN110755705A
Application number: CN201911112220.2A
Authority: CN
Inventors: 李维; 李小苗
Original assignee: BEIJING YAGUO SCIENCE AND TECHNOLOGY Co Ltd
Current assignee: BEIJING YAGUO SCIENCE AND TECHNOLOGY Co Ltd
Priority date: 2019-11-14
Filing date: 2019-11-14
Publication date: 2020-02-07
Also published as: WO2021093842A1

Abstract

The embodiment of the disclosure relates to a subglottic attraction system and a control method thereof, wherein the system comprises: a secretion collecting means for collecting secretions sucked from below the patient's glottis through the suction line; the pressure part is connected with the suction pipeline and is used for providing negative pressure for the suction pipeline and adjusting the magnitude of the provided negative pressure according to the pressure adjusting signal; the sensing unit is connected with the suction pipeline and is used for monitoring the flow and/or pressure in the suction pipeline in real time to obtain monitoring data; and the control unit is connected with the pressure part and the sensing unit, and is used for receiving the monitoring data, generating a pressure adjusting signal according to the monitoring data, sending the pressure adjusting signal to the pressure part, and controlling the suction of the suction system according to the calculation, judgment and decision of the monitoring data. The embodiment of the disclosure can automatically complete the suction operation on the sac, and can automatically start suction by detecting the amount of secretion accumulated under the glottis of a patient, thereby not only reducing the labor intensity of nurses, but also protecting the respiratory mucosa of the patient and ensuring the sufficient suction frequency and suction quality.

Description

Subglottic attraction system and control method thereof

Technical Field

The disclosure relates to the field of medical auxiliary instruments, in particular to a subglottic suction system and a control method thereof.

Background

Mechanical ventilation is widely applied to clinical treatment, particularly intensive care units, as one of the main measures for rescuing critical patients, but Ventilator Associated Pneumonia (VAP) associated with the application of mechanical ventilation becomes a common and serious complication in clinical treatment, and once the VAP occurs to a patient, offline difficulty is easily caused, so that the hospitalization time is prolonged, the hospitalization cost is increased, and the life of the patient is threatened even by serious patients, so that the patient is killed. The mistaken suction of oral secretion to the lower respiratory tract through the artificial airway balloon is an important way for VAP to occur, and effective preventive measures such as subglottic suction are taken to be an important method for controlling the prevalence of VAP and reducing the fatality rate of VAP.

Currently, there are two main ways of subglottic attraction in clinical practice, namely, continuous subglottic attraction and intermittent subglottic attraction. Continuous subglottic suction is to connect the sputum drainage tube to a negative pressure suction device and continuously suck with constant negative pressure, and the mode has the advantages that secretion above the air bag can be prevented from being detained, and the defects that respiratory mucosa is dry and bleeds easily to cause infection are overcome. The intermittent subglottic suction is the intermittent suction with constant negative pressure, the mucous membrane above the air bag can be fully rested by the mode, the change of the temperature and the humidity of the air passage is small, the damage effect of the negative pressure to the mucous membrane is relieved, and the defect caused by continuous subglottic suction is avoided. But currently intermittent subglottic aspiration is done mainly manually by the nurse, e.g. using a syringe for intermittent aspiration. This manual approach can greatly increase the workload of the medical staff and does not guarantee sufficient attraction frequency. Meanwhile, since the amount of the secretions on the sac cannot be directly observed, the determination of the suction timing and the supervision of the suction care quality become difficult, possibly resulting in insufficient suction care on the sac.

As described above, the conventional subglottic suction method increases the workload of the worker, and the control timing cannot be determined.

The above drawbacks are expected to be overcome by those skilled in the art.

Disclosure of Invention

Technical problem to be solved

In order to solve the above problems in the prior art, the present disclosure provides a subglottic attraction system and a control method thereof, so as to solve the problem that in the prior art, the subglottic attraction mode increases the workload of workers and cannot determine the control time.

Additional features and advantages of the disclosure will be set forth in the detailed description which follows, or in part will be obvious from the description, or may be learned by practice of the disclosure.

(II) technical scheme

In order to achieve the above purpose, the present disclosure adopts a main technical solution including:

in one aspect, embodiments of the present disclosure provide a subglottic attraction system, comprising:

a secretion collecting means for collecting secretions sucked from below the patient's glottis through the suction line;

the pressure part is connected with the suction pipeline and is used for providing negative pressure for the suction pipeline and adjusting the magnitude of the provided negative pressure according to a pressure adjusting signal;

the sensing unit is connected with the suction pipeline and is used for monitoring the flow and/or pressure in the suction pipeline in real time to obtain monitoring data;

and the control unit is connected with the pressure part and the sensing unit, and is used for receiving the monitoring data, generating a pressure adjusting signal according to the monitoring data, sending the pressure adjusting signal to the pressure part, and controlling the suction of the suction system according to the calculation, judgment and decision of the monitoring data.

In an embodiment of the present disclosure, the method further includes:

and the switch valve is connected between the pressure part and the suction pipeline and used for controlling whether the pressure part leads negative pressure to the suction pipeline or not according to the opening or closing of the switch valve.

In an embodiment of the present disclosure, the switch valve is further connected to the control unit, and is configured to control the switch valve to open according to an opening instruction from the control unit, and control the switch valve to close according to a closing instruction from the control unit.

On the other hand, an embodiment of the present disclosure further provides a method for controlling a subglottic attraction system, including:

monitoring the flow and/or pressure in the suction pipeline in real time to obtain monitoring data;

calculating, judging and deciding according to the monitoring data, controlling the suction of a suction system, generating a pressure adjusting signal according to the monitoring data, and sending the pressure adjusting signal to a pressure part;

and adjusting the magnitude of the provided negative pressure according to the pressure adjusting signal.

In an embodiment of the present disclosure, the calculating, determining, and deciding based on the monitoring data, controlling the suction of the suction system, and generating the pressure adjustment signal based on the monitoring data includes:

controlling the subglottic suction system to work in a manual mode, a timing mode or an automatic mode and switching the modes;

in the manual mode, determining the suction duration and the suction interval duration according to the operation action of an operator on the switch valve, and performing continuous suction or intermittent suction;

in the timing mode, sending an opening instruction and a closing instruction to the switch valve according to preset suction duration and suction interval duration, and performing suction at regular time;

and in the automatic mode, generating the pressure regulating signal according to the monitoring data and a preset threshold value, and generating an opening instruction or a closing instruction to control a switch valve to automatically perform suction.

In an embodiment of the present disclosure, the monitoring data comprises flow data and/or pressure data, and the automatic mode comprises a tentative pumping phase and a formal pumping phase.

In an embodiment of the present disclosure, in the automatic mode, the method further includes:

judging according to the flow data and the pressure data in a combined manner, and controlling the start and the end of the trial pumping stage and the formal pumping stage; or

And judging according to at least one of the flow data and the pressure data, and controlling the start and the end of the trial pumping stage and the formal pumping stage.

In an embodiment of the present disclosure, the determining according to the combination of the flow data and the pressure data, and controlling the start and the end of the tentative pumping stage and the formal pumping stage includes:

sending a starting instruction to the switch valve, starting a trial pumping stage, entering a formal pumping stage when the product of the pressure data multiplied by the reciprocal of the flow data is greater than or equal to a first preset threshold, and ending the trial pumping stage if the product of the pressure data multiplied by the reciprocal of the flow data is not less than the first preset threshold;

in the formal suction phase, when the product of the pressure data multiplied by the reciprocal of the flow data is smaller than a second preset threshold, a closing instruction is sent to the switch valve, and the formal suction phase is ended, wherein the first preset threshold is larger than the second preset threshold.

and sending an opening instruction to the switch valve, opening the switch valve, starting a trial pumping stage, entering a formal pumping stage when the integral of the product obtained by multiplying the pressure data by the inverse of the flow data in a preset time period is greater than a third threshold, and ending the trial pumping stage if the integral is not greater than the third threshold.

In an embodiment of the present disclosure, the determining according to at least one of the flow data and the pressure data, and controlling the start and the end of the tentative pumping stage and the formal pumping stage includes:

sending a starting instruction to the switch valve, starting the switch valve, entering a trial pumping stage, and stopping trial pumping when the pressure data is smaller than a first pressure threshold and/or the flow data is larger than a first flow threshold;

entering a formal pumping phase when the pressure data is greater than the first pressure threshold and/or the flow data is less than the first flow data;

in the formal suction phase, when the pressure data is smaller than a second pressure threshold and/or the flow data is larger than a second flow threshold, a closing instruction is sent to the switch valve, and the formal suction phase is ended, wherein the first pressure threshold is larger than the second pressure threshold, and the first flow threshold is smaller than the second flow threshold.

(III) advantageous effects

The beneficial effects of this disclosure are: the subglottic suction system and the control method thereof provided by the embodiment of the disclosure monitor the flow and/or pressure conditions of the suction pipeline connecting the patient and the secretion collecting device in the subglottic suction system, and then control and adjust the working condition of the suction system according to the monitoring result, can automatically complete the suction operation on the sac, and can automatically start suction by detecting the amount of the secretion accumulated under the glottis of the patient, thereby not only reducing the labor intensity of nurses, but also protecting the respiratory mucosa of the patient, and also ensuring the sufficient suction frequency and suction quality.

Drawings

Fig. 1 is a schematic view of a subglottic attraction system according to one embodiment of the present disclosure;

FIG. 2 is a schematic view of the connection relationship of a subglottic attraction system of the present disclosure during operation;

fig. 3 is a flowchart of a control method of a subglottic attraction system according to another embodiment of the present disclosure.

Detailed Description

For the purpose of better explaining the present disclosure, and to facilitate understanding thereof, the present disclosure will be described in detail below by way of specific embodiments with reference to the accompanying drawings.

All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein in the description of the disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Fig. 1 is a schematic diagram of a subglottic attraction system according to an embodiment of the present disclosure, and as shown in fig. 1, the system 100 includes: a secretion collecting device 110, a pressure part 120, a sensing unit 130 and a control unit 140.

Wherein the secretion collecting device 110 is used for collecting the secretion sucked out from the patient below the glottis through the suction pipeline; the pressure part 120 is connected with the suction pipeline 110 and is used for providing negative pressure for the suction pipeline and adjusting the magnitude of the provided negative pressure according to a pressure adjusting signal; the sensing unit 130 is connected to the suction line 110, and is configured to monitor flow and/or pressure in the suction line in real time to obtain monitoring data; the control unit 140 is connected to the pressure part connection 120 and the sensing unit 130, and configured to receive the monitoring data, generate the pressure adjustment signal according to the monitoring data, send the pressure adjustment signal to the pressure part 120, and calculate, determine, and decide according to the monitoring data to control the suction of the suction system.

In an embodiment of the present disclosure, the system 100 further includes: and a switching valve (not shown in the figure) connected between the pressure part 120 and the suction pipeline 110, and configured to control whether the pressure part supplies negative pressure to the suction pipeline 110 according to the opening or closing of the switching valve.

In an embodiment of the present disclosure, the switch valve is further connected to the control unit 140, and is configured to control the switch valve to open according to an opening instruction from the control unit 140, and to control the switch valve to close according to a closing instruction from the control unit 140.

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

fig. 2 is a schematic view showing a connection relationship of the subglottal suction system according to the present disclosure during operation, and as shown in fig. 2, the secretion collecting device 1 receives secretions from a patient through a suction pipeline (not labeled), a sensing unit 5 is disposed on the suction pipeline, and the sensing unit 5 is connected with the control unit 3. As shown in fig. 2, the pressure part includes a negative pressure source 1 and a pressure adjusting unit 2, the negative pressure source 1 being for supplying a negative pressure having a suction power; the pressure adjusting unit 2 is connected with the negative pressure source 1 and the control unit 3, and is used for adjusting the magnitude of the negative pressure provided by the negative pressure source 1 according to a pressure adjusting signal from the control unit 3. Further, a switching valve 4 is provided on a connection pipe between the pressure adjusting unit 2 and the suction pipe.

In one embodiment of the present disclosure, the negative pressure source 1 in fig. 2 provides suction power to the entire subglottal suction system, which may be a separate vacuum pump, such as a piston, rotary vane, or water ring vacuum pump, or a negative pressure turbine, or a central suction system configured on a hospital ward treatment belt, or a commercially available sputum aspirator capable of generating negative pressure.

In an embodiment of the present disclosure, 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 may be a single mechanical or electronic vacuum pressure adjusting valve or a combination of a vacuum adjusting valve and a negative pressure tank. Which may be adjusted manually or may receive a pressure adjustment signal from the control unit 3 for pressure adjustment or may be fed back to the control unit 3 for closed loop control adjustment. If the vacuum source 1 is independent, for example a vacuum pump or a fan, the pressure can also be adjusted directly by closed-loop regulation of the rotational speed of the drive motor.

In an embodiment of the present disclosure, the control unit 3 in fig. 2 is configured to receive information such as an external instruction or monitoring data of the sensing unit 5, and after processing the information, may send a signal (i.e., a pressure adjusting signal) for adjusting the magnitude of the pressure value to the pressure adjusting unit 2 to adjust the magnitude of the negative pressure; it is also possible to send a command to the on-off valve 4 to control the on-off valve 4 to open or close to effect the start of suction and the stop of suction.

In an embodiment of the present disclosure, the switch valve 4 in fig. 2 may be a two-position two-way solenoid valve, a pneumatic valve, an electric valve, or a manual switch valve. The on-off valve 4 can be controlled by the control unit 3 to be opened and closed by command control, and can also be manually opened and closed to control when to supply and stop supplying negative pressure to the suction line.

In an embodiment of the present disclosure, the sensing unit 5 in fig. 2 monitors the pressure and/or flow rate in the suction line, and may monitor the pressure by a pressure sensor and the flow rate by a flow rate sensor (or calculate the flow rate value by measuring the pressure value at different positions).

In one embodiment of the present disclosure, the secretion collection device 6 of FIG. 2 collects secretions (e.g., sputum) drawn from under the patient's glottis through the suction line into a container, and the accumulated secretions are disposed of by the caregiver as medical waste.

In summary, according to the subglottic suction system provided by the embodiment of the present disclosure, by adding the sensing unit, the flow rate or the pressure in the suction pipeline is monitored, so as to control and adjust the working condition of the suction system according to the monitoring result, the suction operation on the sac can be automatically completed, and the suction can be automatically started by detecting the amount of the secretion accumulated under the subglottic of the patient, thereby not only reducing the labor intensity of the nurse, but also protecting the respiratory mucosa of the patient, and ensuring the sufficient suction frequency and the suction quality.

The working modes of the subglottic suction system provided in the above embodiment include a manual mode, a timing mode and an automatic mode, and the control method provided by the present disclosure can switch between different modes, and can also perform continuous suction and intermittent suction to realize automatic and appropriate suction, thereby reducing manual operation and protecting the respiratory mucosa of a patient.

Fig. 3 is a flowchart of a control method of a subglottic attraction system according to another embodiment of the present disclosure, as shown in fig. 3, specifically including the following steps:

in step S310, monitoring the flow rate and/or pressure in the suction line in real time to obtain monitoring data;

in step S320, calculating, judging and deciding according to the monitoring data, controlling the suction of the suction system, generating a pressure adjusting signal according to the monitoring data, and sending the pressure adjusting signal to a 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 disclosure, in the control method, the subglottic attraction system is controlled to operate in a manual mode, a timing mode or an automatic mode and to perform mode switching;

1) and in the manual mode, the suction duration and the suction interval duration are determined according to the operation action of the switch valve by an operator, and continuous suction or intermittent suction is performed. For example, in the manual mode, the manual suction button is pressed to open the on-off valve 4 to start suction, and when the manual suction button is pressed again, the on-off valve 4 is closed to stop suction. The single subglottic attraction can be realized through manual operation, the attraction time length and the attraction interval time length are determined by the time length of pressing the manual attraction button twice by an operator, and the intermittent attraction is realized. In addition, due to the operation control, continuous suction can be performed, namely, after the manual suction starting button is pressed down, the manual suction button is not pressed down within a certain period of time, so that the continuous suction is realized.

2) And in the timing mode, sending an opening instruction and a closing instruction to the switch valve according to preset suction duration and suction interval duration, and performing suction at regular time. For example, the control unit 3 is used instead of the function of manually pressing the suction button, and the suction duration and the suction interval time are set in the control unit 3 by setting instructions that are applied to the on-off valve 4, and then the on-off valve 4 is opened by issuing an opening instruction according to the control unit 3, and the on-off valve is opened according to a closing instruction, so that the timing control of the suction period and the suction interval period is realized. The timing control may be intermittent suction for a certain period of time or continuous suction.

In neither the manual nor the timed mode, the sensing unit 5 is involved in the system operation.

3) And in the automatic mode, generating the pressure regulating signal according to the monitoring data and a preset threshold value, and generating an opening instruction or a closing instruction to control a switch valve to automatically perform suction.

When the automatic mode is selected, the sensing unit 5 works after the trial suction is started, the obtained monitoring data comprises flow data and/or pressure data, the system can detect whether the secretion is accumulated at regular time, and if the secretion is accumulated, the suction system is started.

In an embodiment of the present disclosure, the automatic mode includes a trial pumping phase and a regular pumping phase, that is, the general control flow is: opening a switch valve, entering a trial pumping stage, meeting the condition one, stopping the trial pumping, meeting the condition two, entering a formal pumping stage, meeting the condition three, and stopping the formal pumping.

In an embodiment of the present disclosure, in the trial pumping stage, an opening instruction and a closing instruction are sent to the on-off valve according to a preset trial pumping duration, so as to perform trial pumping.

In an embodiment of the present disclosure, in the automatic mode, the following two cases are further included:

(1) the judgment is carried out jointly according to the flow data and the pressure data, namely when the sensing unit 5 detects the pressure and the flow and judges the pressure and the flow, the joint judgment can be carried out on the two parameters at the same time so as to control the start and the end of the trial pumping stage and the formal pumping stage; or

(2) And judging according to at least one of the flow data and the pressure data, and controlling the start and the end of the trial pumping stage and the formal pumping stage.

In an embodiment of the present disclosure, the case (1) specifically includes:

(1.1) sending an opening instruction to the switch valve, opening the switch valve, starting a trial pumping stage, entering a formal pumping stage when the product of the pressure data and the reciprocal of the flow data is greater than or equal to a first preset threshold, and ending the trial pumping stage otherwise. For example, in the trial pumping 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 a first preset threshold value R1, the formal pumping phase is entered, otherwise the pumping is stopped.

(1.2) in the formal suction phase, when the product of the pressure data and the inverse of the flow data is smaller than a second preset threshold, sending a closing instruction to the switch valve, and finishing the formal suction phase, wherein the first preset threshold is larger than the second preset threshold. For example, in the normal suction phase, the control unit 3 adjusts the suction pressure to an appropriate value and continues suction, the sensing unit 5 continues to detect the pressure/flow rate, and transmits data to the control unit, and the control unit 3 gives a closing instruction to the on-off valve 4 and stops suction until the control unit 3 receives that the product of the pressure P and the reciprocal (1/F) of the flow rate F transmitted from the sensing unit 5 is less than a threshold value R2. If the mode is manual, the negative pressure of the normal suction phase is determined by the operator; in the automatic mode, the operator sets the maximum pressure by means of the control unit, and the control unit adjusts the maximum pressure in the range from 0 to the maximum pressure by the principle that the F flow reaches at least a certain threshold value, which may be, for example, 2L/min.

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

and sending an opening instruction to the switch valve, opening the switch valve, starting a trial pumping stage, entering a formal pumping stage when the integral of the product obtained by multiplying the pressure data by the inverse of the flow data in a preset time period is greater than a third threshold, and ending the trial pumping stage if the integral is not greater than the third threshold. For example, the product of the pressure value P and the reciprocal (1/F) of the flow value F may be changed to the integral of the product of the pressure value P and the reciprocal (1/F) of the flow value F over a period of time T1, where the formula is:

and entering a formal suction phase when the trial suction phase R > R3, and stopping suction otherwise, wherein R3 is a value accumulated by a period of time and the product of the pressure and the flow inverse number.

Similarly, in the actual pumping stage, the determination of the end of pumping may be performed by calculating the integral of the product of the pressure value P and the reciprocal (1/F) of the flow rate value F in the period T1.

In the method, an average value of a period of time is obtained by calculating an accumulated value in the period of time and dividing the accumulated value by the time, and the average value obtained by solving is different from an instantaneous value of a single moment in the above situation.

In an embodiment of the present disclosure, the sensing unit 5 may detect pressure and flow simultaneously to perform a joint determination, or may detect pressure and/or flow only to perform a determination, that is, the condition (2) specifically includes:

and (2.1) sending an opening instruction to the switch valve, opening the switch valve, entering a trial pumping stage, and stopping trial pumping when the pressure data is smaller than a first pressure threshold and/or the flow data is larger than a first flow threshold. For example, the control unit 3 periodically sends an opening command to the on-off valve 4 to open the on-off valve 4, and the sensing unit 5 monitors the air flow data/pressure data in real time to perform 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 rate threshold value F1, the suction is immediately stopped.

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

(2.3) in the formal suction phase, when the pressure data is smaller than a second pressure threshold and/or the flow data is larger than a second flow threshold, a closing instruction is sent to the switch valve, and the formal suction phase is ended, wherein the first pressure threshold is larger than the second pressure threshold, and the first flow threshold is smaller than the second flow threshold. For example, in the actual suction phase, the sensing unit 5 continues to detect the pressure/flow and sends the monitoring data to the control unit 3, until the control unit 3 receives that the pressure value P sent by the sensing unit 5 is lower than the second pressure threshold value P2 or/and the flow value F is higher than the second flow threshold value F2, the control unit 3 gives a closing command to the on-off valve 4, and the suction stops.

The pressure and flow rate thresholds P1, P2, F1 and F2 in the above method may be preset or calculated based on detected values of pressure and flow rate over a period of time. When the judgment is carried out, the pressure value, the flow value and each threshold value are the absolute values.

Finally, whether in manual and timed modes, or in automatic mode, involving adjustment of suction pressure, the pressure adjustment in the present disclosure may employ manual, or automatic closed-loop adjustment of a vacuum pressure regulator valve, or adjustment of the motor speed driving a source of negative pressure, to achieve a desired pressure value.

In summary, by using the control method of the subglottal aspiration system provided by the embodiment of the present disclosure, the flow rate or pressure in the aspiration pipeline is monitored, and the working condition of the aspiration system is controlled and adjusted according to the monitoring result, so that the supracapsular aspiration operation can be automatically completed, and the aspiration can be automatically started by detecting the amount of secretion accumulated under the subglottal of the patient, thereby not only reducing the labor intensity of the nurse, but also protecting the respiratory mucosa of the patient, and ensuring the sufficient aspiration frequency and aspiration quality.

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

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A subglottic aspiration system, comprising:

2. The subglottic attraction system of claim 1, further comprising:

3. The subglottic attraction system of claim 2, wherein the on-off valve is further connected to the control unit for controlling the on-off valve to open in accordance with an on command from the control unit and to close in accordance with an off command from the control unit.

4. A method of controlling a subglottic attraction system, comprising:

5. The method of claim 4, wherein said calculating, determining and deciding based on said monitored data, controlling the suction of the suction system, and generating a pressure adjustment signal based on said monitored data comprises:

6. The method of controlling a subglottic aspiration system of claim 5, wherein the monitored data includes flow data and/or pressure data and the automatic mode includes a tentative aspiration phase and a formal aspiration phase.

7. The method of controlling a subglottic attraction system of claim 6, further comprising, in the automatic mode:

8. The method of controlling a subglottic aspiration system of claim 7, wherein the determining based on the flow data and the pressure data in combination, and controlling the beginning and the end of the tentative aspiration phase and the formal aspiration phase comprises:

9. The method of controlling a subglottic aspiration system of claim 7, wherein the determining based on the flow data and the pressure data in combination, and controlling the beginning and the end of the tentative aspiration phase and the formal aspiration phase comprises:

10. The method of controlling a subglottic aspiration system of claim 7, wherein the determining based on at least one of the flow data and the pressure data, controlling the beginning and the end of the tentative suction phase and the formal suction phase comprises: