CN117482352A - Breathing machine humidification control method and system - Google Patents

Breathing machine humidification control method and system Download PDF

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Publication number
CN117482352A
CN117482352A CN202311708971.7A CN202311708971A CN117482352A CN 117482352 A CN117482352 A CN 117482352A CN 202311708971 A CN202311708971 A CN 202311708971A CN 117482352 A CN117482352 A CN 117482352A
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Prior art keywords
temperature
humidity
target
absolute humidity
power
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Inventor
刘宽
祝荣荣
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Resvent Medical Technology Co Ltd
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Resvent Medical Technology Co Ltd
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Priority to CN202311708971.7A priority Critical patent/CN117482352A/en
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/10—Preparation of respiratory gases or vapours
    • A61M16/14—Preparation of respiratory gases or vapours by mixing different fluids, one of them being in a liquid phase
    • A61M16/16—Devices to humidify the respiration air
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/021—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes operated by electrical means
    • A61M16/022—Control means therefor
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/10—Preparation of respiratory gases or vapours
    • A61M16/1075—Preparation of respiratory gases or vapours by influencing the temperature
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/10—Preparation of respiratory gases or vapours
    • A61M16/14—Preparation of respiratory gases or vapours by mixing different fluids, one of them being in a liquid phase
    • A61M16/16—Devices to humidify the respiration air
    • A61M16/161—Devices to humidify the respiration air with means for measuring the humidity
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M2205/00—General characteristics of the apparatus
    • A61M2205/33—Controlling, regulating or measuring
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M2205/00—General characteristics of the apparatus
    • A61M2205/33—Controlling, regulating or measuring
    • A61M2205/3368—Temperature
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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  • Health & Medical Sciences (AREA)
  • Emergency Medicine (AREA)
  • Pulmonology (AREA)
  • Engineering & Computer Science (AREA)
  • Anesthesiology (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Hematology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The application provides a breathing machine humidification control method and system, and relates to the technical field of breathing machines. The ventilator humidification control method comprises the following steps: acquiring a target temperature and a target relative humidity; acquiring a first temperature and a first relative humidity of an air inlet measured by a first temperature and humidity sensor; calculating a target absolute humidity according to the target temperature and the target relative humidity, and calculating a first absolute humidity according to the first temperature and the first relative humidity; calculating first power of the humidifier according to the target absolute humidity and the first absolute humidity; acquiring a second temperature and a second relative humidity of the air outlet measured by a second temperature and humidity sensor; calculating a second absolute humidity according to the second temperature and the second relative humidity; obtaining second power of the humidifier according to the target absolute humidity and the second absolute humidity; and obtaining target power according to the first power and the second power, and controlling a heating disc of the humidifier according to the target power so as to realize humidification of gas inhaled by a user and improve treatment comfort.

Description

Breathing machine humidification control method and system
Technical Field
The application relates to the technical field of respirators, in particular to a method and a system for controlling humidification of a respirator.
Background
In modern clinical medicine, a ventilator is an effective means capable of replacing autonomous ventilation by manpower, has been widely used for treating obstructive sleep apnea and Chronic Obstructive Pulmonary Disease (COPD) of patients, and occupies a very important position in the field of modern medicine.
In order to ensure proper temperature and humidity of the gas inhaled by the user, it is often necessary to humidify the gas inhaled by the user to reduce the damage of the dry gas to the respiratory airways. However, condensed water is easily generated during the humidification process, affecting the use and therapeutic effect of the user.
Disclosure of Invention
In order to at least overcome the above-mentioned shortcomings in the prior art, an object of the present application is to provide a method and a system for controlling humidification of a ventilator.
In a first aspect, an embodiment of the present application provides a ventilator humidification control method, including:
acquiring a target temperature and a target relative humidity;
acquiring a first temperature and a first relative humidity of an air inlet measured by a first temperature and humidity sensor;
calculating a target absolute humidity according to the target temperature and the target relative humidity, and calculating a first absolute humidity according to the first temperature and the first relative humidity;
calculating first power of the humidifier according to the target absolute humidity and the first absolute humidity;
acquiring a second temperature and a second relative humidity of the air outlet measured by a second temperature and humidity sensor;
calculating a second absolute humidity according to the second temperature and the second relative humidity;
obtaining second power of the humidifier according to the target absolute humidity and the second absolute humidity;
and obtaining target power according to the first power and the second power, and controlling the humidifier according to the target power.
In one possible implementation, the step of calculating the first power of the humidifier according to the target absolute humidity and the first absolute humidity includes:
obtaining the average flow of the air outlet measured by the flow sensor;
calculating a humidification amount according to the average flow, the target absolute humidity and the first absolute humidity;
the first power of the humidifier is determined according to the humidification amount.
In one possible implementation, the humidification amount Δx is calculated by:
Δx＝F×(AH0-AH1)
where F represents the average flow rate, AH0 represents the target absolute humidity, and AH1 represents the first absolute humidity.
In one possible implementation manner, the step of obtaining the second power of the humidifier according to the target absolute humidity and the second absolute humidity includes:
and performing proportional integral control according to the difference value of the target absolute humidity and the second absolute humidity to obtain the second power of the humidifier.
In one possible implementation, the target absolute humidity and the first absolute humidity are calculated by:
AH＝RH×(0.0003×t 3 +0.0105×t 2 +0.3034×t+4.8083)
wherein AH represents absolute humidity, RH represents relative humidity, t represents temperature, t.epsilon. -20,40].
In one possible implementation, the method further includes:
calculating a dew point temperature based on the second temperature and the second relative humidity;
and adjusting the temperature in the breathing pipeline according to the dew point temperature.
In a second aspect, an embodiment of the present application further provides a ventilator humidification control system, using the method of the first aspect, where the ventilator humidification control system includes:
the humidifier comprises an air inlet, an air outlet, a humidifier, a first temperature and humidity sensor and a second temperature and humidity sensor;
the air flow input in the air inlet is transmitted to the air outlet through the humidifier;
the first temperature and humidity sensor is arranged at the air inlet and is used for measuring the temperature and the relative humidity of the air flow of the air inlet;
the second temperature and humidity sensor is arranged at the air outlet and is used for measuring the temperature and relative humidity of the air flow at the air outlet.
In one possible implementation, the ventilator humidification control system further comprises a flow sensor;
the flow sensor is arranged at the air inlet and is used for measuring the flow of the air inlet.
In one possible implementation, the ventilator humidification control system further includes a breathing conduit and a breathing mask;
one end of the breathing pipeline is connected with the air outlet, the other end of the breathing pipeline is connected with the breathing mask, and air flow in the air outlet is transmitted to the breathing mask through the breathing pipeline.
In one possible implementation, a heating wire is further disposed in the breathing tube, and the heating wire is used for adjusting the temperature in the breathing tube.
Based on any one of the aspects, the method and the system for controlling humidification of a ventilator provided by the embodiment of the application can determine the first power of the heating plate in the humidifier according to the first temperature and the first relative humidity measured by the first temperature and humidity sensor, and can determine the second power of the heating plate in the humidifier according to the second temperature and the second relative humidity measured by the second temperature and humidity sensor, so that the heating plate in the humidifier is controlled according to the first power and the second power, humidification of gas inhaled by a user is realized, and treatment comfort is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following description will briefly explain the drawings required for the embodiments, it being understood that the following drawings illustrate only some embodiments of the present application and are therefore not to be considered limiting of the scope, and that other related drawings may be obtained according to these drawings without the inventive effort of a person skilled in the art.
Fig. 1 is a schematic flow chart of a ventilator humidification control method according to the present embodiment;
fig. 2 is a schematic diagram of the substeps of step S400 provided in the present embodiment;
FIG. 3 is a second flowchart of a method for controlling humidification of a ventilator according to the present embodiment;
fig. 4 is a schematic structural diagram of a ventilator humidification control system according to the present embodiment.
Icon: 100-air inlet; 200-air outlet; 300-humidifier; 400-a first temperature and humidity sensor; 500-a second temperature and humidity sensor; 600-flow sensor; 700-breathing tube; 800-breathing mask.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present application, it should be noted that, the azimuth or positional relationship indicated by the terms "upper", "lower", etc. are based on the azimuth or positional relationship shown in the drawings, or the azimuth or positional relationship that is commonly put when the product of the application is used, are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and therefore should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal," "vertical," "overhang," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.
It should be noted that, in the case of no conflict, different features in the embodiments of the present application may be combined with each other.
The following detailed description of specific embodiments of the present application refers to the accompanying drawings.
Referring to fig. 1, the present embodiment provides a method for controlling humidification of a ventilator, which may include the following steps.
Step S100, obtaining a target temperature and a target relative humidity.
In this embodiment, the target temperature T0 and the target relative humidity RH0 may be obtained according to the humidification level and the temperature set by the user when the user uses the ventilator.
In step S200, the first temperature and the first relative humidity of the air inlet 100 measured by the first temperature and humidity sensor 400 are obtained.
In this embodiment, the temperature and humidity of the air inlet 100 of the ventilator may be measured by the first temperature and humidity sensor 400, so as to obtain the first temperature T1 and the first relative humidity RH1.
And step S300, calculating target absolute humidity according to the target temperature and the target relative humidity, and calculating first absolute humidity according to the first temperature and the first relative humidity.
In this embodiment, the target absolute humidity AH0 may be calculated according to the target temperature T0 and the target relative humidity RH0 obtained in step S100, and the first absolute humidity AH1 may be calculated according to the first temperature T1 and the first relative humidity RH1 obtained in step S200. Wherein, the unit of the target absolute humidity AH0 and the first absolute humidity AH1 may be mg/L.
Step S400, calculating the first power of the humidifier 300 according to the target absolute humidity and the first absolute humidity.
In this embodiment, the first power W1 of the heating plate in the humidifier 300 may be calculated according to the target absolute humidity AH0 and the first absolute humidity AH1 obtained in step S300.
Step S500, a second temperature and a second relative humidity of the air outlet 200 measured by the second temperature and humidity sensor 500 are obtained.
In this embodiment, the temperature and humidity of the air outlet 200 of the ventilator may be measured by the second temperature and humidity sensor 500, so as to obtain the second temperature T2 and the second relative humidity RH2.
Step S600, calculating a second absolute humidity according to the second temperature and the second relative humidity.
In this embodiment, the second absolute humidity AH2 may be calculated according to the second temperature T2 and the second relative humidity RH2 obtained in step S500.
Step S700, obtaining the second power of the humidifier 300 according to the target absolute humidity and the second absolute humidity.
In this embodiment, the second power W2 of the heating plate in the humidifier 300 may be obtained according to the target absolute humidity AH0 calculated in step S300 and the second absolute humidity AH2 calculated in step S600.
Step S800, obtaining a target power according to the first power and the second power, and controlling the humidifier 300 according to the target power.
In this embodiment, the target power W may be obtained according to the sum of the first power W1 obtained in step S400 and the second power W2 obtained in step S700, that is, w=w1+w2, so that the heating plate in the humidifier 300 is controlled according to the target power W, to achieve humidification of the inhaled gas of the user, and improve the therapeutic comfort.
In the above design, the first power W1 of the heating plate in the humidifier 300 may be determined according to the first temperature T1 and the first relative humidity RH1 measured by the first temperature and humidity sensor 400, and the second power W2 of the heating plate in the humidifier 300 may be determined according to the second temperature T2 and the second relative humidity RH2 measured by the second temperature and humidity sensor 500, so that the heating plate in the humidifier 300 is controlled according to the first power W1 and the second power W2, so as to realize humidification of the inhaled gas of the user, and improve the therapeutic comfort.
In one possible implementation, referring to fig. 2, step S400 may include the following sub-steps.
In step S410, the average flow of the air outlet 200 measured by the flow sensor 600 is obtained.
In this embodiment, the flow rate of the air outlet 200 may be measured by the flow rate sensor 600, and the average flow rate F measured by the flow rate sensor 600 may be obtained. Wherein, the unit of the average flow F can be L/min.
Step S420, calculating a humidification amount according to the average flow, the target absolute humidity and the first absolute humidity.
In this embodiment, the humidification amount Δx may be calculated according to the average flow F obtained in step S410 and the target absolute humidity AH0 and the first absolute humidity AH1 obtained in step S300. The unit of the humidification amount Δx may be mg/min.
Step S430, determining the first power of the humidifier 300 according to the humidification amount.
In the present embodiment, the first power of the heating pan in the humidifier 300 may be determined according to the humidification amount Δx calculated in step S420.
In one possible implementation, the humidification amount Δx may be calculated by:
Δx＝F×(AH0-AH1)
where F represents the average flow rate, AH0 represents the target absolute humidity, and AH1 represents the first absolute humidity.
In one possible implementation, when the second power of the humidifier 300 is obtained according to the target absolute humidity and the second absolute humidity, proportional-Integral (PI) control may be performed according to a difference between the target absolute humidity and the second absolute humidity to obtain the second power of the humidifier 300.
Specifically, the second absolute humidity AH2 may be compared with the target absolute humidity AH0 as feedback, and Proportional-Integral (PI) control may be performed, thereby outputting the second power W2 of the humidifier 300.
In one possible implementation, the target absolute humidity and the first absolute humidity may be calculated by:
AH＝RH×(0.0003×t 3 +0.0105×t 2 +0.3034×t+4.8083)
wherein AH represents absolute humidity, RH represents relative humidity, t represents temperature, t.epsilon. -20,40]. Relative humidity refers to the percentage of water vapor pressure in air to the saturated water vapor pressure at the same temperature. Absolute humidity refers to the mass of water vapor in a unit volume of air.
In one possible implementation, referring to fig. 3, the ventilator humidification control method may further include the following steps.
Step S910, calculating a dew point temperature according to the second temperature and the second relative humidity.
In this embodiment, the dew point temperature T may be calculated according to the second temperature T2 and the second relative humidity RH2 measured by the second temperature and humidity sensor 500 in step S500 by using a Magnus-Tetens formula d . The dew point temperature T d Refers to the temperature at which the air is cooled to saturation by cooling while maintaining the air pressure unchanged.
Specifically, the dew point temperature T d The method can be obtained by the following calculation method:
wherein,t2 represents a second temperature, RH2 represents a second relative humidity, a and b represent magnus coefficients, a=17.625, b= 243.04 ℃ according to the recommendations of Alduchov and eskrridge.
It should be noted that the Magnus-Tetens formula applies to a temperature range of-45℃to 60 ℃.
Step S920, adjusting the temperature in the respiratory tract 700 according to the dew point temperature.
In the present embodiment, the dew point temperature T may be calculated according to step S910 d It is determined whether or not condensation of the gas in the breathing tube 700 occurs, thereby adjusting the temperature in the breathing tube 700.
If it is calculatedTo said dew point temperature T d < T1, the gas in the breathing tube 700 will not condense. Wherein T1 may represent the ambient temperature measured by the temperature and humidity sensor at the air inlet 100.
If T max ＞T d > T1, the temperature of the heating wire in the breathing tube 700 needs to be controlled so that the temperature T of the inner wall of the breathing tube 700 Tube1 Above the dew point temperature T d . In particular, the temperature T of the NTC resistor of the pipeline can be acquired Tube0 And the target temperature T0, the temperature in the breathing tube 700 may be controlled to reach the target temperature T0 using Proportional-Integral (PI) control. If the target temperature T0 is set manually by the user, it is necessary to determine whether the target temperature T0 is greater than the dew point temperature T d If the target temperature T0 is not greater than the dew point temperature T d Condensation may occur, and at this time, the display screen of the ventilator pops up a prompt message to prompt the user to raise the target temperature T0. Wherein T is max Indicating the maximum temperature at which the breathing tube 700 can be controlled.
It should be noted that the target temperature T0 may also be set automatically, and may be directly based on the dew point temperature T d Determining the target temperature T0, e.g. the dew point temperature T d At 18.6 ℃, the target temperature T0 may be automatically set to 19 ℃.
If T d ＞T max > T1, then represents the dew point temperature T d Greater than the controllable maximum temperature T of the breathing tube 700 max In this case, even if the breathing tube 700 is heated, a condensation phenomenon occurs. At this time, the display screen of the breathing machine pops up a prompt message to prompt the user to adjust and reduce the humidification level.
In the above design, the dew point temperature T may be calculated by the second temperature T2 and the second relative humidity RH2 of the humidified gas measured by the second temperature and humidity sensor 500 provided at the gas outlet 200 d Then at the dew point temperature T d Based on control ofThe temperature in the breathing tube 700 is such that the temperature in the breathing tube 700 is greater than the dew point temperature T d Thereby avoiding condensation within the breathing conduit 700.
Referring to fig. 4, the ventilator humidification control system may include an air inlet 100, an air outlet 200, a humidifier 300, a first temperature and humidity sensor 400, and a second temperature and humidity sensor 500.
The air flow inputted from the air inlet 100 may be humidified by the humidifier 300 and then transferred to the air outlet 200. Specifically, the air flow inputted into the air inlet 100 may enter the humidifier 300 after passing through the turbine, the air flow is humidified by the humidifier 300, and then the humidified air flow is transferred to the air outlet 200.
The first temperature and humidity sensor 400 is disposed on the air inlet 100, and the first temperature and humidity sensor 400 may be used to measure the temperature and relative humidity of the air flow of the air inlet 100.
The second temperature and humidity sensor 500 is disposed at the air outlet 200, and the second temperature and humidity sensor 500 may be used to measure the temperature and relative humidity of the air flow at the air outlet 200.
In the above structure, the first temperature of the air inlet 100 and the first relative humidity may be measured according to the first temperature and humidity sensor 400, so as to determine the first power of the heating plate in the humidifier 300, and at the same time, the second temperature of the air outlet 200 and the second relative humidity may be measured according to the second temperature and humidity sensor 500, so as to determine the second power of the heating plate in the humidifier 300, and the heating plate in the humidifier 300 may be controlled according to the first power and the second power, so as to achieve humidification of the air inhaled by the user, and improve the therapeutic comfort.
In one possible implementation, referring again to fig. 4, the ventilator humidification control system may also include a flow sensor 600.
The flow sensor 600 is disposed at the air inlet 100, and the flow sensor 600 may be used to measure the flow rate of the air flow of the air inlet 100.
In this embodiment, the average flow rate may be obtained from the flow rate of the air flow of the air inlet 100 measured by the flow sensor 600, the humidification amount may be calculated according to the average flow rate, and the first power of the heating plate in the humidifier 300 may be determined according to the humidification amount.
In one possible implementation, referring again to fig. 4, the ventilator humidification control system may further include a breathing conduit 700 and a breathing mask 800.
One end of the breathing tube 700 is connected with the air outlet 200, the other end of the breathing tube 700 is connected with the breathing mask 800, and the air flow in the air outlet 200 can be transmitted to the breathing mask 800 through the breathing tube 700.
In one possible implementation, a heating wire is also disposed within the breathing tube 700, which may be used to adjust the temperature within the breathing tube 700.
Since condensed water is easily generated because the temperature of the gas in the breathing tube 700 is higher than the ambient temperature outside the breathing tube 700, the generation of condensed water can be reduced using a method of heating the breathing tube 700. However, this method cannot completely stop the condensation phenomenon, and the heating temperature of the pipe cannot be quantitatively controlled according to the actual condensation condition.
In this embodiment, the heating temperature of the heating wire in the breathing pipe 700 may be controlled according to the calculated dew point temperature, so that the temperature in the breathing pipe 700 is greater than the dew point temperature, thereby avoiding condensation phenomenon in the breathing pipe 700 and affecting the use and treatment effects of the user.
In summary, the embodiment provides a method and a system for controlling humidification of a ventilator, which can determine a first power of a heating plate in the humidifier according to a first temperature and a first relative humidity measured by a first temperature and humidity sensor, and determine a second power of the heating plate in the humidifier according to a second temperature and a second relative humidity measured by a second temperature and humidity sensor, so as to control the heating plate in the humidifier according to the first power and the second power, thereby realizing humidification of gas inhaled by a user and improving therapeutic comfort.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims (10)

1. A method of ventilator humidification control, the method comprising:
acquiring a target temperature and a target relative humidity;
acquiring a first temperature and a first relative humidity of an air inlet measured by a first temperature and humidity sensor;
calculating a target absolute humidity according to the target temperature and the target relative humidity, and calculating a first absolute humidity according to the first temperature and the first relative humidity;
calculating first power of the humidifier according to the target absolute humidity and the first absolute humidity;
acquiring a second temperature and a second relative humidity of the air outlet measured by a second temperature and humidity sensor;
calculating a second absolute humidity according to the second temperature and the second relative humidity;
obtaining second power of the humidifier according to the target absolute humidity and the second absolute humidity;
and obtaining target power according to the first power and the second power, and controlling the humidifier according to the target power.
2. The method of claim 1, wherein the step of calculating a first power of the humidifier based on the target absolute humidity and the first absolute humidity comprises:
obtaining the average flow of the air outlet measured by the flow sensor;
calculating a humidification amount according to the average flow, the target absolute humidity and the first absolute humidity;
the first power of the humidifier is determined according to the humidification amount.
3. The ventilator humidification control method of claim 2, wherein the humidification amount Δx is calculated by:
Δx＝F×(AH0-AH1)
where F represents the average flow rate, AH0 represents the target absolute humidity, and AH1 represents the first absolute humidity.
4. The method of claim 1, wherein the step of obtaining the second power of the humidifier based on the target absolute humidity and the second absolute humidity comprises:
and performing proportional integral control according to the difference value of the target absolute humidity and the second absolute humidity to obtain the second power of the humidifier.
5. The ventilator humidification control method of claim 1, wherein the target absolute humidity and the first absolute humidity are calculated by:
AH＝RH×(0.0003×t 3 +0.0105×t 2 +0.3034×t+4.8083)
wherein AH represents absolute humidity, RH represents relative humidity, t represents temperature, t.epsilon. -20,40].
6. The ventilator humidification control method of claim 1, wherein the method further comprises:
calculating a dew point temperature based on the second temperature and the second relative humidity;
and adjusting the temperature in the breathing pipeline according to the dew point temperature.
7. A ventilator humidification control system, wherein the ventilator humidification control system comprises:
the humidifier comprises an air inlet, an air outlet, a humidifier, a first temperature and humidity sensor and a second temperature and humidity sensor;
the air flow input in the air inlet is transmitted to the air outlet through the humidifier;
the first temperature and humidity sensor is arranged at the air inlet and is used for measuring the temperature and the relative humidity of the air flow of the air inlet;
the second temperature and humidity sensor is arranged at the air outlet and is used for measuring the temperature and relative humidity of the air flow at the air outlet.
8. The ventilator humidification control system of claim 7, further comprising a flow sensor;
the flow sensor is arranged at the air inlet and is used for measuring the flow of the air inlet.
9. The ventilator humidification control system of claim 7, further comprising a breathing conduit and a breathing mask;
one end of the breathing pipeline is connected with the air outlet, the other end of the breathing pipeline is connected with the breathing mask, and air flow in the air outlet is transmitted to the breathing mask through the breathing pipeline.
10. The ventilator humidification control system of claim 9, wherein a heating wire is further disposed within the breathing conduit, the heating wire being configured to adjust a temperature within the breathing conduit.
CN202311708971.7A 2023-12-11 2023-12-11 Breathing machine humidification control method and system Pending CN117482352A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311708971.7A CN117482352A (en) 2023-12-11 2023-12-11 Breathing machine humidification control method and system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311708971.7A CN117482352A (en) 2023-12-11 2023-12-11 Breathing machine humidification control method and system

Publications (1)

Publication Number Publication Date
CN117482352A true CN117482352A (en) 2024-02-02

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Application Number Title Priority Date Filing Date
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