CN113244495A - Oxygen concentration control method and device of breathing machine and breathing machine - Google Patents
Oxygen concentration control method and device of breathing machine and breathing machine Download PDFInfo
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- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 393
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 391
- 239000001301 oxygen Substances 0.000 title claims abstract description 391
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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
- A61M16/1005—Preparation of respiratory gases or vapours with O2 features or with parameter measurement
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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
- A61M16/0003—Accessories therefor, e.g. sensors, vibrators, negative pressure
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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
- A61M16/12—Preparation of respiratory gases or vapours by mixing different gases
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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
- A61M16/0003—Accessories therefor, e.g. sensors, vibrators, negative pressure
- A61M2016/0027—Accessories therefor, e.g. sensors, vibrators, negative pressure pressure meter
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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
- A61M16/1005—Preparation of respiratory gases or vapours with O2 features or with parameter measurement
- A61M2016/102—Measuring a parameter of the content of the delivered gas
- A61M2016/1025—Measuring a parameter of the content of the delivered gas the O2 concentration
Abstract
The invention relates to an oxygen concentration control method and device of a breathing machine and the breathing machine, wherein the method comprises the following steps: acquiring a first corresponding relation between the sampling voltage and the oxygen concentration under a first airway pressure and a second corresponding relation between the sampling voltage and the oxygen concentration under a second airway pressure; acquiring a corresponding relation between the airway pressure and a deviation value of the sampling voltage according to the first corresponding relation and the second corresponding relation; obtaining a deviation value corresponding to the current sampling voltage according to the current airway pressure and the corresponding relation between the airway pressure and the deviation value of the sampling voltage; obtaining the current oxygen concentration of the breathing machine according to the current sampling voltage, the deviation value corresponding to the current sampling voltage and the first corresponding relation; and controlling the breathing machine to adjust the ratio of the oxygen flow and the air flow in the total gas flow according to the current oxygen concentration and a preset target oxygen concentration. Compared with the prior art, the method and the device improve the accuracy of oxygen concentration acquisition and realize accurate adjustment of oxygen flow and air flow of the breathing machine.
Description
Technical Field
The embodiment of the application relates to the technical field of respirators, in particular to a method and a device for controlling oxygen concentration of a respirator and the respirator.
Background
A ventilator, as a device capable of manually replacing the function of spontaneous ventilation, has been widely used in respiratory failure due to various reasons, anesthesia respiratory management during major surgery, respiratory support therapy, and emergency resuscitation, and has occupied a very important place in the modern medical field.
The ventilators used at present are equipped with a chemical oxygen battery (i.e. a chemical oxygen sensor). It relies on the oxygen-enriched gas dispersion in the breathing machine pipeline to detect when measuring oxygen concentration, and when airway pressure was big, dispersion speed was fast and detection speed was fast, vice versa, consequently, different airway pressure can bring certain influence for oxygen concentration measurement's accuracy, and then influences the use of breathing machine.
Disclosure of Invention
The embodiment of the application provides an oxygen concentration control method and device of a breathing machine and the breathing machine, which can solve the technical problem that the oxygen concentration control accuracy rate of the breathing machine is low, and the technical scheme is as follows:
in a first aspect, an embodiment of the present application provides an oxygen concentration control method for a ventilator, the ventilator including a chemical oxygen sensor for outputting a sampling voltage related to an oxygen concentration of the ventilator, the method including the steps of:
acquiring a first corresponding relation between sampling voltage output by the chemical oxygen sensor and oxygen concentration under a first airway pressure and a second corresponding relation between sampling voltage output by the chemical oxygen sensor and oxygen concentration under a second airway pressure;
acquiring a corresponding relation between the airway pressure and a deviation value of the sampling voltage according to the first corresponding relation under the first airway pressure and the second corresponding relation under the second airway pressure;
acquiring the current airway pressure of the respirator and the current sampling voltage output by the chemical oxygen sensor;
obtaining a deviation value corresponding to the current sampling voltage according to the current airway pressure and the corresponding relation between the airway pressure and the deviation value of the sampling voltage;
obtaining the current oxygen concentration of the breathing machine according to the current sampling voltage, the deviation value corresponding to the current sampling voltage and a first corresponding relation between the sampling voltage and the oxygen concentration under the first airway pressure;
controlling the breathing machine to adjust the ratio of oxygen flow and air flow in total gas flow according to the current oxygen concentration of the breathing machine and a preset target oxygen concentration; wherein the total flow of gases of the ventilator includes an oxygen flow and an air flow.
Optionally, the obtaining a corresponding relationship between the airway pressure and a deviation value of the sampling voltage according to the first corresponding relationship under the first airway pressure and the second corresponding relationship under the second airway pressure includes:
obtaining a deviation value of a sampling voltage value corresponding to the first oxygen concentration when the first airway pressure changes to the second airway pressure according to a difference value between the sampling voltage value corresponding to the first oxygen concentration in the first corresponding relation and the sampling voltage value corresponding to the first oxygen concentration in the second corresponding relation;
acquiring a deviation value of a sampling voltage value corresponding to the second oxygen concentration from a first air passage pressure to a second air passage pressure according to a difference value between the sampling voltage value corresponding to the second oxygen concentration in the first corresponding relation and the sampling voltage value corresponding to the second oxygen concentration in the second corresponding relation;
acquiring a first difference value between the second airway pressure and the first airway pressure and a second difference value between a deviation value of a sampling voltage value corresponding to the second oxygen concentration and a deviation value of a sampling voltage value corresponding to the first oxygen concentration;
and acquiring an equal proportion corresponding relation between the airway pressure and the deviation value of the sampling voltage according to the ratio of the first difference value to the second difference value.
Optionally, the obtaining the current oxygen concentration of the ventilator according to the current sampling voltage, the deviation value corresponding to the current sampling voltage, and the first corresponding relationship between the sampling voltage and the oxygen concentration under the first airway pressure includes:
obtaining a corrected sampling voltage according to the current sampling voltage and the deviation value of the current sampling voltage;
and obtaining the current oxygen concentration of the breathing machine according to the corrected sampling voltage and the first corresponding relation between the sampling voltage and the oxygen concentration under the first airway pressure.
Optionally, the ventilator includes an incremental feedback controller, and the control unit controls the ventilator to adjust the ratio of the oxygen flow rate and the air flow rate in the total gas flow rate according to the current oxygen concentration of the ventilator and a preset target oxygen concentration, including:
obtaining an oxygen concentration increment value according to the difference value between the current oxygen concentration and the target oxygen concentration at preset time intervals;
and inputting the oxygen concentration increment value into the incremental feedback controller, and controlling the incremental feedback controller to increase the air flow of the respirator and reduce the oxygen flow of the respirator or increase the oxygen flow of the respirator and reduce the air flow of the respirator according to the oxygen concentration increment and the total gas flow on the basis of keeping the total gas flow unchanged.
Optionally, after increasing the airflow of the ventilator and decreasing the oxygen flow of the ventilator or increasing the oxygen flow of the ventilator and decreasing the airflow of the ventilator according to the oxygen concentration increment and the total flow of gas, the method further includes the steps of:
and judging whether the increased air flow of the breathing machine exceeds a preset threshold or whether the increased oxygen flow of the breathing machine exceeds a preset threshold, if so, controlling the incremental feedback controller to stop increasing the air flow of the breathing machine or stop increasing the oxygen flow of the breathing machine.
Optionally, the acquiring a current airway pressure of the ventilator and a current sampling voltage output by the chemical oxygen sensor includes:
acquiring a current usage mode of the respirator;
and judging whether the breathing machine is subjected to oxygen concentration control in the use mode, if so, setting a target oxygen concentration corresponding to the use mode, and acquiring the current airway pressure of the breathing machine and the current sampling voltage output by the chemical oxygen sensor.
In a second aspect, an embodiment of the present application provides an oxygen concentration control apparatus for a ventilator, including:
a first correspondence between degrees and a second correspondence between a sampled voltage output by the chemical oxygen sensor and an oxygen concentration at a second airway pressure;
the second relation obtaining unit is used for obtaining the corresponding relation between the airway pressure and the deviation value of the sampling voltage according to the first corresponding relation under the first airway pressure and the second corresponding relation under the second airway pressure;
the data acquisition unit is used for acquiring the current airway pressure of the respirator and the current sampling voltage output by the chemical oxygen sensor;
the first operation unit is used for obtaining a deviation value corresponding to the current sampling voltage according to the current airway pressure and the corresponding relation between the deviation values of the airway pressure and the sampling voltage;
the oxygen concentration compensation unit is used for obtaining the current oxygen concentration of the breathing machine according to the current sampling voltage, the deviation value corresponding to the current sampling voltage and the first corresponding relation between the sampling voltage and the oxygen concentration under the first airway pressure;
the control unit is used for controlling the breathing machine to adjust the ratio of oxygen flow and air flow in total gas flow according to the current oxygen concentration of the breathing machine and a preset target oxygen concentration; wherein the total flow of gases of the ventilator includes an oxygen flow and an air flow.
In a third aspect, an embodiment of the present application provides a ventilator, including: a chemical oxygen sensor, a processor connected to the chemical oxygen sensor, a memory, and a computer program stored in the memory and executable on the processor, the processor implementing the steps of the method for controlling oxygen concentration of a ventilator according to the first aspect when executing the computer program.
In a fourth aspect, the present application provides a computer-readable storage medium storing a computer program, which when executed by a processor implements the steps of the method for controlling oxygen concentration of a ventilator according to the first aspect.
According to the embodiment of the application, a first corresponding relation between sampling voltage and oxygen concentration output by the chemical oxygen sensor under a first airway pressure and a second corresponding relation between sampling voltage and oxygen concentration output by the chemical oxygen sensor under a second airway pressure are obtained; acquiring a corresponding relation between the airway pressure and a deviation value of the sampling voltage according to the first corresponding relation under the first airway pressure and the second corresponding relation under the second airway pressure; acquiring the current airway pressure of a respirator, the current sampling voltage output by a chemical oxygen sensor and the target oxygen concentration of the respirator; obtaining a deviation value corresponding to the current sampling voltage according to the current airway pressure and the corresponding relation between the airway pressure and the deviation value of the sampling voltage; obtaining the current oxygen concentration of the breathing machine according to the current sampling voltage, the deviation value corresponding to the current sampling voltage and the corresponding relation between the sampling voltage and the oxygen concentration under the first airway pressure; controlling the breathing machine to adjust the ratio of oxygen flow and air flow in total gas flow according to the current oxygen concentration of the breathing machine and a preset target oxygen concentration; wherein the total flow of gases of the ventilator includes an oxygen flow and an air flow. The embodiment of the application fully considers the influence of the airway pressure of the respirator on the oxygen concentration measurement, obtains the deviation value of the current sampling voltage under the current airway pressure by acquiring the corresponding relation between the deviation values of different airway pressures and the sampling voltage, thereby compensating and correcting the current sampling voltage by utilizing the deviation value, improving the accuracy of the acquired current oxygen concentration, and realizing the accurate regulation of the oxygen flow and the air flow of the respirator based on the current oxygen concentration and the set target oxygen concentration.
For a better understanding and implementation, the technical solutions of the present application are described in detail below with reference to the accompanying drawings.
Drawings
Fig. 1 is a schematic flow chart of a method for controlling oxygen concentration of a ventilator according to an embodiment of the present disclosure;
fig. 2 is a schematic flowchart of S102 in a method for controlling oxygen concentration of a ventilator according to an embodiment of the present application;
FIG. 3 is a schematic diagram illustrating an isometric relationship between the deviation values of the airway pressure and the sampled voltage according to an embodiment of the present disclosure;
fig. 4 is a schematic flowchart of S103 in a method for controlling oxygen concentration of a ventilator according to an embodiment of the present application;
fig. 5 is a schematic flowchart of S106 in an oxygen concentration control method of a ventilator according to an embodiment of the present application;
fig. 6 is a schematic flowchart of S106 in a method for controlling oxygen concentration of a ventilator according to another embodiment of the present application;
FIG. 7 is a schematic structural diagram of an oxygen concentration control apparatus of a ventilator according to an embodiment of the present disclosure;
fig. 8 is a schematic structural diagram of a ventilator according to an embodiment of the present application.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present application. The word "if/if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.
Before explaining the method for controlling oxygen concentration of a ventilator in detail, the principle of measuring oxygen concentration of a ventilator will be briefly explained:
a general ventilator includes a chemical oxygen sensor (i.e., a chemical oxygen battery), which can directly output a sampling voltage related to the oxygen concentration in the ventilator, but cannot directly output the oxygen concentration in the ventilator.
Therefore, in order to measure the oxygen concentration in the ventilator, the chemical oxygen sensor needs to be calibrated in advance, that is, the corresponding relationship between the sampling voltage associated with the chemical oxygen sensor and the oxygen concentration is set, and then the measurement result of the oxygen concentration in the ventilator is obtained based on the sampling voltage and the corresponding relationship between the sampling voltage and the oxygen concentration.
However, the airway pressure in the breathing machine can be changed, and the chemical oxygen sensor can cause different degrees of deviation to the measurement of the oxygen concentration under different airway pressures to influence the oxygen concentration control effect of the breathing machine, so that the embodiment of the application provides an oxygen concentration control method of the breathing machine to improve the accuracy of the oxygen concentration measurement and realize the accurate control of the oxygen concentration.
Referring to fig. 1, a schematic flow chart of a method for controlling oxygen concentration of a ventilator according to an embodiment of the present application is shown, the method including the following steps:
s101: a first corresponding relationship between the sampled voltage output by the chemical oxygen sensor and the oxygen concentration at a first airway pressure and a second corresponding relationship between the sampled voltage output by the chemical oxygen sensor and the oxygen concentration at a second airway pressure are obtained.
In an optional embodiment, the main body of the implementation of the oxygen concentration control method of the ventilator may be the ventilator, or may be a component in the ventilator, such as a processor or a microprocessor inside the ventilator; in another alternative embodiment, the main executing body of the oxygen concentration control method of the ventilator may be a control device which establishes data connection with the ventilator, or may be a component in the control device; in other alternative embodiments, the main body for executing the oxygen concentration control method of the ventilator may also be a remote server which establishes a data connection with the ventilator.
In the embodiment of the application, the main execution body of the oxygen concentration control method of the breathing machine is the breathing machine.
The ventilator acquires a first corresponding relation between the sampling voltage output by the chemical oxygen sensor and the oxygen concentration under a first airway pressure and a second corresponding relation between the sampling voltage output by the chemical oxygen sensor and the oxygen concentration under a second airway pressure.
In an alternative embodiment, the first airway pressure and the second airway pressure refer to the lowest airway pressure and the highest airway pressure that the ventilator can provide under normal circumstances, such as: first gas line pressure is set to 0cmH2O, i.e., zero altitude standard atmospheric pressure, and the second airway pressure is set to 120cmH2O。
In other alternative embodiments, the first airway pressure and the second airway pressure may be adjusted reasonably, but a certain difference exists between the first airway pressure and the second airway pressure as much as possible, so that the influence degree of the oxygen concentration measurement under different airway pressures can be obtained more easily.
It should be noted that, in the embodiment of the present application, the oxygen concentration and the sampling voltage in the first corresponding relationship and the second corresponding relationship are real values obtained through experiments, and do not contain data errors.
Refer to tables A and B below, wherein Table A shows that the first gas line pressure is 0cmH2An example of a first correspondence between oxygen concentration and sampled voltage at O, Table B shows that the second airway pressure is 120cmH2O, an example of a second correspondence between the oxygen concentration and the sampling voltage.
It can be seen that the first gas line pressure in Table A is 0cmH2In the case of O, the sampling voltage is 100 when the oxygen concentration is 21%, and 1000 when the oxygen concentration is 100%.
Table B shows the second airway pressure as 120cmH2In the case of O, the sampling voltage is 90 when the oxygen concentration is 21%, and 900 when the oxygen concentration is 100%.
The sampling voltage output by the chemical oxygen sensor is not an analog voltage, but an AD sampling voltage obtained by converting the analog voltage after the chemical oxygen sensor acquires the analog voltage, and therefore the sampling voltage output by the chemical oxygen sensor is a dimensionless value having no unit.
While the analog voltage may be in volts V, kilovolts kV, millivolts mV, or the like, in the embodiment of the present application, the analog voltage is in volts V.
Since 0cmH is typically used for chemical oxygen sensors2The corresponding relationship between the oxygen concentration and the sampling voltage at O, i.e. at zero altitude standard atmospheric pressure, is calibrated, so it can be understood from the two examples of table a and table B that the following relationship is related to the airway pressureFrom 0cmH2O to 120cmH2O, the sampling voltages corresponding to the same oxygen concentration are different, and therefore, the sampling voltage output by the chemical oxygen sensor may deviate with the change of airway pressure.
If it is higher than 0cmH2Under the airway pressure of O, the first corresponding relationship is still used to obtain the oxygen concentration, which may cause inaccuracy of the oxygen concentration measurement, and therefore, the corresponding relationship between the airway pressure and the deviation value of the sampling voltage needs to be obtained to improve the accuracy of the oxygen concentration measurement.
S102: and acquiring a corresponding relation between the airway pressure and a deviation value of the sampling voltage according to the first corresponding relation under the first airway pressure and the second corresponding relation under the second airway pressure.
And the respirator acquires the change of the deviation value of the sampling voltage along with the increase of the airway pressure according to the first corresponding relation under the first airway pressure and the second corresponding relation under the second airway pressure to obtain the corresponding relation between the airway pressure and the deviation value of the sampling voltage.
In an alternative embodiment, referring to fig. 2, step S102 includes steps S1021 to S1024, which are as follows:
s1021: and acquiring a deviation value of the sampling voltage value corresponding to the first oxygen concentration when the first airway pressure is changed to the second airway pressure according to a difference value between the sampling voltage value corresponding to the first oxygen concentration in the first corresponding relation and the sampling voltage value corresponding to the first oxygen concentration in the second corresponding relation.
The respirator acquires the difference value between the sampling voltage corresponding to the first oxygen concentration in the first corresponding relation and the sampling voltage corresponding to the first oxygen concentration in the second corresponding relation, namely, the respirator acquires the deviation value of the sampling voltage corresponding to the first oxygen concentration when the airway pressure changes from the first airway pressure to the second airway pressure.
Specifically, the deviation value of the sampled voltage corresponding to the first oxygen concentration when the first airway pressure changes to the second airway pressure is calculated according to the formula: cO1＝AP1_O1-BP2_O1。
Wherein A isP1_O1Representing a sampling voltage corresponding to a first oxygen concentration in a first correspondence, BP2_O1A sampling voltage, C, corresponding to the first oxygen concentration in the second corresponding relationshipO1A deviation value representing a sampled voltage value corresponding to the first oxygen concentration at a change from the first airway pressure to the second airway pressure is indicated.
When the first correspondence and the second correspondence are examples provided in table a and table B respectively,
the value of the sum of the values is 100,
a value of 90, C21％The value is 10.
S1022: and acquiring a deviation value of the sampling voltage value corresponding to the second oxygen concentration from the first air passage pressure to the second air passage pressure according to the difference value between the sampling voltage value corresponding to the second oxygen concentration in the first corresponding relation and the sampling voltage value corresponding to the second oxygen concentration in the second corresponding relation.
The respirator acquires a difference value between a sampling voltage corresponding to the second oxygen concentration in the first corresponding relation and a sampling voltage corresponding to the second oxygen concentration in the second corresponding relation, namely, the respirator acquires a deviation value of the sampling voltage corresponding to the second oxygen concentration when the airway pressure changes from the first airway pressure to the second airway pressure.
In the embodiment of the present application, the first oxygen concentration and the second oxygen concentration refer to the lowest oxygen concentration and the highest oxygen concentration provided by the ventilator during the experiment. In other alternative embodiments, the first oxygen concentration and the second oxygen concentration may be adjusted appropriately.
Specifically, the calculation formula of the deviation value of the sampling voltage corresponding to the second oxygen concentration when the first airway pressure changes to the second airway pressure is as follows: cO2＝AP1_O2-BP2_O2
Wherein A isP1_O2Indicating a sampling voltage corresponding to the second oxygen concentration in the first correspondence, BP2_O2A sampling voltage C corresponding to the second oxygen concentration in the second correspondenceO2And the deviation value of the sampling voltage value corresponding to the second oxygen concentration under the condition of changing from the first air passage pressure to the second air passage pressure is represented.
When the first correspondence and the second correspondence are examples provided in table a and table B respectively,
the value of the number of the bits is 1000,
a value of 900, C21％The value is 100.
S1023: and acquiring a first difference value between the second airway pressure and the first airway pressure and a second difference value between the deviation value of the sampling voltage value corresponding to the second oxygen concentration and the deviation value of the sampling voltage value corresponding to the first oxygen concentration.
The respirator acquires a first difference value between the second airway pressure and the first airway pressure and a second difference value between a deviation value of a sampling voltage value corresponding to the second oxygen concentration and a deviation value of a sampling voltage value corresponding to the first oxygen concentration under the second airway pressure from the first airway pressure change value.
Specifically, the first difference between the second airway pressure and the first airway pressure is calculated as: pvalue＝P2-P1And under the second airway pressure from the first airway pressure change value, calculating a second difference value between the deviation value of the sampling voltage value corresponding to the second oxygen concentration and the deviation value of the sampling voltage value corresponding to the first oxygen concentration by using the formula: cvalue＝CO2-CO1。
Wherein, PvalueDenotes a first difference, CvalueThe second difference is indicated.
Based on the examples provided in tables A and B, please refer to Table C below, which is an airway pressure from 0cmH2O to 120cmH2O one example of a deviation value of a sampled voltage.
In Table C, a first difference P between the second airway pressure and the first airway pressure value120, a second difference value C between the deviation value of the sampling voltage value corresponding to the second oxygen concentration and the deviation value of the sampling voltage value corresponding to the first oxygen concentrationvalueIs 90.
S1024: and acquiring an equal proportion corresponding relation between the airway pressure and the deviation value of the sampling voltage according to the ratio of the first difference value to the second difference value.
And the respirator acquires the ratio of the second difference to the first difference, and acquires the equal proportion corresponding relation between the airway pressure and the deviation value of the sampling voltage according to the ratio of the second difference to the first difference.
If the ratio of the second difference to the first difference is denoted as R, the airway pressure is denoted as X, and the offset of the sampled voltage is denoted as Y, then the proportional correspondence between the airway pressure and the offset of the sampled voltage is Y ═ RX,
as can be seen from the example of Table C, if the first difference P isvalue120-0 ═ 120, second difference Cvalue100-10 to 90, the proportional correspondence between airway pressure and the offset value of the sampled voltage is then
Please refer to fig. 3, which is a diagram illustrating an isometric relationship between deviation values of airway pressure and sampling voltage according to an embodiment of the present application. FIG. 3 shows the airway pressureThe proportional corresponding relation between the force and the deviation value of the sampling voltage is
In the corresponding diagram, it can be seen that as the airway pressure increases, the deviation value of the sampling voltage also increases gradually.
It should be noted that C acquired in this embodimentO1A deviation value C representing a sampled voltage value corresponding to the first oxygen concentration at a change from the first airway pressure to the second airway pressureO2The deviation value of the sampled voltage value corresponding to the second oxygen concentration when the first airway pressure changes to the second airway pressure is shown, so that the second difference value C between the two deviation values can be knownvalue＝CO2-CO1In addition to being related to the change in airway pressure from the first airway pressure to the second airway pressure, there is also a correlation with the magnitude of the oxygen concentration. When the equal proportion corresponding relation between the airway pressure and the deviation value of the sampling voltage is obtained, the influence of the oxygen concentration on the deviation value of the sampling voltage is ignored in the embodiment, and the compensation speed of the sampling voltage is improved.
In another alternative embodiment, an equal proportion corresponding relation between the acquired airway pressure and the deviation value of the sampling voltage can be obtained
And then, carrying out equal proportion operation on the oxygen concentration again to obtain the corresponding relation between the oxygen concentration and the deviation value of the sampling voltage under different airway pressures and oxygen concentrations, thereby further improving the precision of the obtained deviation value of the sampling voltage.
S103: and acquiring the current airway pressure of the respirator and the current sampling voltage output by the chemical oxygen sensor.
The current airway pressure of the respirator is the airway pressure value obtained at the current sampling moment. The airway pressure value may be obtained by a pressure sensor in the ventilator.
The current sampling voltage output by the chemical oxygen sensor is the sampling voltage obtained at the current sampling moment.
In an alternative embodiment, referring to fig. 4, step S103 includes steps S1031 to S1032 as follows:
s1031: and acquiring the current usage mode of the respirator.
In this embodiment, in some cases, the oxygen concentration does not need to be controlled, and therefore, before the current airway pressure of the ventilator and the current sampling voltage output by the chemical oxygen sensor need to be obtained, the current usage mode of the ventilator needs to be obtained first, and it is determined whether oxygen concentration control needs to be performed on the ventilator in the breathing mode.
S1032: and judging whether the breathing machine is subjected to oxygen concentration control in the use mode, if so, setting a target oxygen concentration corresponding to the use mode, and acquiring the current airway pressure of the breathing machine and the current sampling voltage output by the chemical oxygen sensor.
The breathing machine is judging need be right under the user mode when oxygen concentration control is carried out to the breathing machine, can assess patient's health, and then adjust to different user mode to set up the target oxygen concentration that corresponds with user mode, in order to improve the result of use of breathing machine.
When the breathing machine does not need to carry out oxygen concentration control on the breathing machine in the use mode, the following steps do not need to be executed.
S104: and obtaining a deviation value corresponding to the current sampling voltage according to the current airway pressure and the corresponding relation between the airway pressure and the deviation value of the sampling voltage.
And the respirator obtains the deviation value corresponding to the current sampling voltage according to the current airway pressure and the corresponding relation between the airway pressure and the deviation value of the sampling voltage.
For example: if the corresponding relation between the airway pressure and the deviation value of the sampling voltage is
Then, if the current airway pressure is 70, thenThe current sampled voltage corresponds to an offset value of 52.5.
S105: and obtaining the current oxygen concentration of the breathing machine according to the current sampling voltage, the deviation value corresponding to the current sampling voltage and the first corresponding relation between the sampling voltage and the oxygen concentration under the first airway pressure.
And the respirator obtains the corrected sampling voltage according to the current sampling voltage and the deviation value corresponding to the current sampling voltage, and then obtains the current oxygen concentration of the respirator according to the corrected sampling voltage and the first corresponding relation between the sampling voltage and the oxygen concentration under the first airway pressure.
Moreover, as can be understood from tables 1 and 2, as the airway pressure increases, the sampling voltage corresponding to the same oxygen concentration decreases, and therefore, in the embodiment of the present application, the ventilator needs to add the offset value corresponding to the current sampling voltage to implement the correction of the sampling voltage.
S106: controlling the breathing machine to adjust the ratio of oxygen flow and air flow in total gas flow according to the current oxygen concentration of the breathing machine and a preset target oxygen concentration; wherein the total flow of gases of the ventilator includes an oxygen flow and an air flow.
The target oxygen concentration is preset in the ventilator, and the target oxygen concentration is the oxygen concentration which the ventilator needs to achieve by controlling the oxygen flow and the air flow.
The oxygen concentration is the ratio of the oxygen flow rate to the total gas flow rate, wherein the total gas flow rate comprises the oxygen flow rate and the air flow rate. The oxygen concentration of the breathing machine can reach the preset target oxygen concentration by controlling the breathing machine to adjust the oxygen flow rate and the ratio of the air flow rate in the total gas flow rate.
In an alternative embodiment, since the control of the air flow and the oxygen flow in the ventilator is performed independently, the accuracy of the oxygen concentration control is low, and therefore, in order to control the oxygen concentration of the ventilator more accurately, the ventilator provided in the embodiment of the present application is provided with an incremental feedback controller, please refer to fig. 5, where step S106 includes steps S1061 to S1062, which are as follows:
s1061: and obtaining an oxygen concentration increment value according to the difference value between the current oxygen concentration and the target oxygen concentration at preset intervals.
And acquiring the difference between the current oxygen concentration and the target oxygen concentration by the respirator at preset time intervals to obtain an oxygen concentration increment value.
The oxygen concentration increase value may be a positive number or a negative number.
S1062: and inputting the oxygen concentration increment value into the incremental feedback controller, and controlling the incremental feedback controller to increase the air flow of the respirator and reduce the oxygen flow of the respirator or increase the oxygen flow of the respirator and reduce the air flow of the respirator according to the oxygen concentration increment and the total gas flow on the basis of keeping the total gas flow unchanged.
The incremental feedback controller judges whether to increase the air flow of the breathing machine and reduce the oxygen flow of the breathing machine or to increase the oxygen flow of the breathing machine and reduce the air flow of the breathing machine according to the oxygen concentration incremental value.
Specifically, when the oxygen concentration increment value is a positive number, indicating that the current oxygen concentration is higher than the target oxygen concentration, the incremental feedback controller multiplies the oxygen concentration increment value by the total flow rate of gas to obtain an oxygen increment value (which is a positive number at this time), and accordingly increases the flow rate of the ventilator and decreases the flow rate of the ventilator.
Wherein the increased air flow is the same as the decreased oxygen flow to keep the total gas flow constant.
When the oxygen concentration increment value is negative, indicating that the current oxygen concentration is lower than the target oxygen concentration, the incremental feedback controller multiplies the oxygen concentration increment value by the total gas flow rate to obtain an oxygen increment value (which is a negative number at this time), and correspondingly increases the oxygen flow rate of the ventilator and decreases the air flow rate of the ventilator.
Wherein the increased oxygen flow is the same as the decreased air flow to keep the total gas flow constant.
In an alternative embodiment, to prevent over-regulation of oxygen flow and air flow and improve ventilator safety, referring to fig. 6, step S106 further includes step S1063, which is as follows:
s1063: and judging whether the increased air flow of the breathing machine exceeds a preset threshold or whether the increased oxygen flow of the breathing machine exceeds a preset threshold, if so, controlling the incremental feedback controller to stop increasing the air flow of the breathing machine or stop increasing the oxygen flow of the breathing machine.
The preset threshold is preset in the ventilator, in an alternative embodiment, the preset threshold is a smaller value between 2% of the total flow rate of gas and 3LPM, and in other alternative embodiments, the threshold can be adjusted reasonably according to the characteristics of the ventilator.
In this embodiment, through setting up increment feedback control ware, can adjust the proportion of oxygen flow and air mass flow in the breathing machine in real time, under the unchangeable condition of the gaseous total flow of assurance breathing machine, realize the accurate control to oxygen concentration, the effective operation of assurance breathing machine is guaranteed to the dynamic environment of ability adaptation breathing machine.
According to the embodiment of the application, a first corresponding relation between sampling voltage and oxygen concentration output by the chemical oxygen sensor under a first airway pressure and a second corresponding relation between sampling voltage and oxygen concentration output by the chemical oxygen sensor under a second airway pressure are obtained; acquiring a corresponding relation between the airway pressure and a deviation value of the sampling voltage according to the first corresponding relation under the first airway pressure and the second corresponding relation under the second airway pressure; acquiring the current airway pressure of a respirator, the current sampling voltage output by a chemical oxygen sensor and the target oxygen concentration of the respirator; obtaining a deviation value corresponding to the current sampling voltage according to the current airway pressure and the corresponding relation between the airway pressure and the deviation value of the sampling voltage; obtaining the current oxygen concentration of the breathing machine according to the current sampling voltage, the deviation value corresponding to the current sampling voltage and the corresponding relation between the sampling voltage and the oxygen concentration under the first airway pressure; controlling the breathing machine to adjust the ratio of oxygen flow and air flow in total gas flow according to the current oxygen concentration of the breathing machine and a preset target oxygen concentration; wherein the total flow of gases of the ventilator includes an oxygen flow and an air flow. The embodiment of the application fully considers the influence of the airway pressure of the respirator on the oxygen concentration measurement, obtains the deviation value of the current sampling voltage under the current airway pressure by acquiring the corresponding relation between the deviation values of different airway pressures and the sampling voltage, thereby compensating and correcting the current sampling voltage by utilizing the deviation value, improving the accuracy of the acquired current oxygen concentration, and realizing the accurate regulation of the oxygen flow and the air flow of the respirator based on the current oxygen concentration and the set target oxygen concentration.
Fig. 7 is a schematic structural diagram of an oxygen concentration control apparatus of a ventilator according to an embodiment of the present application. The apparatus may be implemented as all or part of a ventilator by software, hardware, or a combination of both. The device 7 comprises:
a first relationship acquisition unit 71 configured to acquire a first correspondence relationship between a sampled voltage output by the chemical oxygen sensor and an oxygen concentration at a first airway pressure and a second correspondence relationship between a sampled voltage output by the chemical oxygen sensor and an oxygen concentration at a second airway pressure;
a second relationship obtaining unit 72, configured to obtain a corresponding relationship between the airway pressure and a deviation value of the sampling voltage according to the first corresponding relationship under the first airway pressure and the second corresponding relationship under the second airway pressure;
a data obtaining unit 73, configured to obtain a current airway pressure of the ventilator and a current sampling voltage output by the chemical oxygen sensor;
a first operation unit 74, configured to obtain a deviation value corresponding to the current sampling voltage according to the current airway pressure and a corresponding relationship between the deviation values of the airway pressure and the sampling voltage;
the oxygen concentration compensation unit 75 is configured to obtain a current oxygen concentration of the ventilator according to the current sampling voltage, a deviation value corresponding to the current sampling voltage, and a first corresponding relationship between the sampling voltage and the oxygen concentration under a first airway pressure;
a control unit 76, configured to control the ventilator to adjust a ratio of oxygen flow and air flow in a total gas flow according to a current oxygen concentration of the ventilator and a preset target oxygen concentration; wherein the total flow of gases of the ventilator includes an oxygen flow and an air flow.
According to the embodiment of the application, a first corresponding relation between sampling voltage and oxygen concentration output by the chemical oxygen sensor under a first airway pressure and a second corresponding relation between sampling voltage and oxygen concentration output by the chemical oxygen sensor under a second airway pressure are obtained; acquiring a corresponding relation between the airway pressure and a deviation value of the sampling voltage according to the first corresponding relation under the first airway pressure and the second corresponding relation under the second airway pressure; acquiring the current airway pressure of a respirator, the current sampling voltage output by a chemical oxygen sensor and the target oxygen concentration of the respirator; obtaining a deviation value corresponding to the current sampling voltage according to the current airway pressure and the corresponding relation between the airway pressure and the deviation value of the sampling voltage; obtaining the current oxygen concentration of the breathing machine according to the current sampling voltage, the deviation value corresponding to the current sampling voltage and the corresponding relation between the sampling voltage and the oxygen concentration under the first airway pressure; controlling the breathing machine to adjust the ratio of oxygen flow and air flow in total gas flow according to the current oxygen concentration of the breathing machine and a preset target oxygen concentration; wherein the total flow of gases of the ventilator includes an oxygen flow and an air flow. The embodiment of the application fully considers the influence of the airway pressure of the respirator on the oxygen concentration measurement, obtains the deviation value of the current sampling voltage under the current airway pressure by acquiring the corresponding relation between the deviation values of different airway pressures and the sampling voltage, thereby compensating and correcting the current sampling voltage by utilizing the deviation value, improving the accuracy of the acquired current oxygen concentration, and realizing the accurate regulation of the oxygen flow and the air flow of the respirator based on the current oxygen concentration and the set target oxygen concentration.
Optionally, the second relationship obtaining unit 72 includes:
the first deviation value acquisition unit is used for acquiring a deviation value of a sampling voltage value corresponding to the first oxygen concentration when the first airway pressure changes to the second airway pressure according to a difference value between the sampling voltage value corresponding to the first oxygen concentration in the first corresponding relation and the sampling voltage value corresponding to the first oxygen concentration in the second corresponding relation;
a second deviation value obtaining unit, configured to obtain a deviation value of a sampling voltage value corresponding to a second oxygen concentration, which changes from a first airway pressure to a second airway pressure, according to a difference between a sampling voltage value corresponding to the second oxygen concentration in the first corresponding relationship and a sampling voltage value corresponding to the second oxygen concentration in the second corresponding relationship;
the second operation unit is used for acquiring a first difference value between the second airway pressure and the first airway pressure and a second difference value between a deviation value of a sampling voltage value corresponding to the second oxygen concentration and a deviation value of a sampling voltage value corresponding to the first oxygen concentration;
and the equal proportion corresponding relation obtaining unit is used for obtaining the equal proportion corresponding relation between the airway pressure and the deviation value of the sampling voltage according to the ratio of the first difference value to the second difference value.
It should be noted that, when the oxygen concentration control apparatus of a ventilator provided in the above embodiment executes the oxygen concentration control method of a ventilator, only the division of the above functional modules is taken as an example, in practical applications, the above functions may be distributed to different functional modules according to needs, that is, the internal structure of the apparatus may be divided into different functional modules to complete all or part of the above described functions. In addition, the oxygen concentration control device of the breathing machine and the oxygen concentration control method of the breathing machine provided by the above embodiment belong to the same concept, and details of the implementation process are shown in the method embodiment and are not described herein again.
Fig. 8 is a schematic structural diagram of a ventilator according to an embodiment of the present application. As shown in fig. 8, the ventilator 8 may include: a chemical oxygen sensor 100, a processor 80 connected to the chemical oxygen sensor, a memory 80, and a computer program 82 stored in the memory 80 and executable on the processor 80, such as: an oxygen concentration control program of the breathing machine; the processor 80, when executing the computer program 82, implements the steps in the above-described method embodiments, such as the steps S101 to S106 shown in fig. 1. Alternatively, the processor 80, when executing the computer program 82, implements the functions of the modules/units in the above-described device embodiments, such as the functions of the modules 71 to 76 shown in fig. 7.
The processor 80 may include one or more processing cores, among others. The processor 80 is connected to various components within the ventilator 8 using various interfaces and lines, and performs various functions of the ventilator 8 and processes data by executing or executing instructions, programs, code sets, or instruction sets stored in the memory 81 and calling up data in the memory 81, and optionally, the processor 80 may be implemented in at least one hardware form of Digital Signal Processing (DSP), Field-Programmable Gate Array (FPGA), Programmable Logic Array (PLA). The processor 80 may integrate one or a combination of a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), a modem, and the like. Wherein, the CPU mainly processes an operating system, a user interface, an application program and the like; the GPU is used for rendering and drawing contents required to be displayed by the touch display screen; the modem is used to handle wireless communications. It is understood that the modem may not be integrated into the processor 80, but may be implemented by a single chip.
The Memory 81 may include a Random Access Memory (RAM) or a Read-Only Memory (Read-Only Memory). Optionally, the memory 81 includes a non-transitory computer-readable medium. The memory 81 may be used to store instructions, programs, code sets or instruction sets. The memory 81 may include a program storage area and a data storage area, wherein the program storage area may store instructions for implementing an operating system, instructions for at least one function (such as touch instructions, etc.), instructions for implementing the above-mentioned method embodiments, and the like; the storage data area may store data and the like referred to in the above respective method embodiments. The memory 81 may optionally be at least one memory device located remotely from the processor 80.
An embodiment of the present application further provides a computer storage medium, where the computer storage medium may store a plurality of instructions, and the instructions are suitable for being loaded by a processor and being used to execute the method steps in the embodiments shown in fig. 1, fig. 2, and fig. 4 to fig. 6, and a specific execution process may refer to specific descriptions of the embodiments shown in fig. 1, fig. 2, and fig. 4 to fig. 6, which is not described herein again.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus/terminal device and method may be implemented in other ways. For example, the above-described embodiments of the apparatus/terminal device are merely illustrative, and for example, the division of the module or unit is only one logical division, and there may be other divisions when the actual implementation is performed, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated module/unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc.
The present invention is not limited to the above-described embodiments, and various modifications and variations of the present invention are intended to be included within the scope of the claims and the equivalent technology of the present invention if they do not depart from the spirit and scope of the present invention.
Claims (10)
1. A method for controlling oxygen concentration of a ventilator, the ventilator including a chemical oxygen sensor for outputting a sampling voltage correlated with oxygen concentration of the ventilator, the method comprising the steps of:
acquiring a first corresponding relation between sampling voltage output by the chemical oxygen sensor and oxygen concentration under a first airway pressure and a second corresponding relation between sampling voltage output by the chemical oxygen sensor and oxygen concentration under a second airway pressure;
acquiring a corresponding relation between the airway pressure and a deviation value of the sampling voltage according to the first corresponding relation under the first airway pressure and the second corresponding relation under the second airway pressure;
acquiring the current airway pressure of the respirator and the current sampling voltage output by the chemical oxygen sensor;
obtaining a deviation value corresponding to the current sampling voltage according to the current airway pressure and the corresponding relation between the airway pressure and the deviation value of the sampling voltage;
obtaining the current oxygen concentration of the breathing machine according to the current sampling voltage, the deviation value corresponding to the current sampling voltage and a first corresponding relation between the sampling voltage and the oxygen concentration under the first airway pressure;
controlling the breathing machine to adjust the ratio of oxygen flow and air flow in total gas flow according to the current oxygen concentration of the breathing machine and a preset target oxygen concentration; wherein the total flow of gases of the ventilator includes an oxygen flow and an air flow.
2. The method for controlling oxygen concentration of a ventilator according to claim 1, wherein the step of obtaining the corresponding relationship between the airway pressure and the deviation value of the sampling voltage according to the first corresponding relationship at the first airway pressure and the second corresponding relationship at the second airway pressure comprises the steps of:
obtaining a deviation value of a sampling voltage value corresponding to the first oxygen concentration when the first airway pressure changes to the second airway pressure according to a difference value between the sampling voltage value corresponding to the first oxygen concentration in the first corresponding relation and the sampling voltage value corresponding to the first oxygen concentration in the second corresponding relation;
acquiring a deviation value of a sampling voltage value corresponding to the second oxygen concentration from a first air passage pressure to a second air passage pressure according to a difference value between the sampling voltage value corresponding to the second oxygen concentration in the first corresponding relation and the sampling voltage value corresponding to the second oxygen concentration in the second corresponding relation;
acquiring a first difference value between the second airway pressure and the first airway pressure and a second difference value between a deviation value of a sampling voltage value corresponding to the second oxygen concentration and a deviation value of a sampling voltage value corresponding to the first oxygen concentration;
and acquiring an equal proportion corresponding relation between the airway pressure and the deviation value of the sampling voltage according to the ratio of the first difference value to the second difference value.
3. The method for controlling oxygen concentration of a ventilator according to claim 1, wherein the obtaining of the current oxygen concentration of the ventilator according to the current sampling voltage, the deviation value corresponding to the current sampling voltage, and the first corresponding relationship between the sampling voltage and the oxygen concentration at the first airway pressure comprises:
obtaining a corrected sampling voltage according to the current sampling voltage and the deviation value corresponding to the current sampling voltage;
and obtaining the current oxygen concentration of the breathing machine according to the corrected sampling voltage and the first corresponding relation between the sampling voltage and the oxygen concentration under the first airway pressure.
4. The method of claim 1, wherein the ventilator comprises an incremental feedback controller, and the method of controlling the ventilator to adjust the ratio of the oxygen flow and the air flow in the total gas flow according to the current oxygen concentration of the ventilator and a preset target oxygen concentration comprises the steps of:
obtaining an oxygen concentration increment value according to the difference value between the current oxygen concentration and the target oxygen concentration at preset time intervals;
and inputting the oxygen concentration increment value into the incremental feedback controller, and controlling the incremental feedback controller to increase the air flow of the respirator and reduce the oxygen flow of the respirator or increase the oxygen flow of the respirator and reduce the air flow of the respirator according to the oxygen concentration increment and the total gas flow on the basis of keeping the total gas flow unchanged.
5. The method of claim 1, wherein the method further comprises the steps of, after increasing the flow rate of air and decreasing the flow rate of oxygen, or increasing the flow rate of oxygen and decreasing the flow rate of air, according to the oxygen concentration increment and the total flow rate of gas:
and judging whether the increased air flow of the breathing machine exceeds a preset threshold or whether the increased oxygen flow of the breathing machine exceeds a preset threshold, if so, controlling the incremental feedback controller to stop increasing the air flow of the breathing machine or stop increasing the oxygen flow of the breathing machine.
6. The method for controlling oxygen concentration of a ventilator according to claim 1, wherein the step of obtaining the current airway pressure of the ventilator and the current sampling voltage output by the chemical oxygen sensor comprises the steps of:
acquiring a current usage mode of the respirator;
and judging whether the breathing machine is subjected to oxygen concentration control in the use mode, if so, setting a target oxygen concentration corresponding to the use mode, and acquiring the current airway pressure of the breathing machine and the current sampling voltage output by the chemical oxygen sensor.
7. An oxygen concentration control apparatus for a ventilator, comprising:
a first relation acquisition unit for acquiring a first corresponding relation between a sampling voltage output by the chemical oxygen sensor and an oxygen concentration at a first airway pressure and a second corresponding relation between the sampling voltage output by the chemical oxygen sensor and the oxygen concentration at a second airway pressure;
the second relation obtaining unit is used for obtaining the corresponding relation between the airway pressure and the deviation value of the sampling voltage according to the first corresponding relation under the first airway pressure and the second corresponding relation under the second airway pressure;
the data acquisition unit is used for acquiring the current airway pressure of the respirator and the current sampling voltage output by the chemical oxygen sensor;
the first operation unit is used for obtaining a deviation value corresponding to the current sampling voltage according to the current airway pressure and the corresponding relation between the deviation values of the airway pressure and the sampling voltage;
the oxygen concentration compensation unit is used for obtaining the current oxygen concentration of the breathing machine according to the current sampling voltage, the deviation value corresponding to the current sampling voltage and the first corresponding relation between the sampling voltage and the oxygen concentration under the first airway pressure;
the control unit is used for controlling the breathing machine to adjust the ratio of oxygen flow and air flow in total gas flow according to the current oxygen concentration of the breathing machine and a preset target oxygen concentration; wherein the total flow of gases of the ventilator includes an oxygen flow and an air flow.
8. The oxygen concentration control apparatus of a ventilator according to claim 7, wherein the second relation acquisition unit includes:
the first deviation value acquisition unit is used for acquiring a deviation value of a sampling voltage value corresponding to the first oxygen concentration when the first airway pressure changes to the second airway pressure according to a difference value between the sampling voltage value corresponding to the first oxygen concentration in the first corresponding relation and the sampling voltage value corresponding to the first oxygen concentration in the second corresponding relation;
a second deviation value obtaining unit, configured to obtain a deviation value of a sampling voltage value corresponding to a second oxygen concentration, which changes from a first airway pressure to a second airway pressure, according to a difference between a sampling voltage value corresponding to the second oxygen concentration in the first corresponding relationship and a sampling voltage value corresponding to the second oxygen concentration in the second corresponding relationship;
the second operation unit is used for acquiring a first difference value between the second airway pressure and the first airway pressure and a second difference value between a deviation value of a sampling voltage value corresponding to the second oxygen concentration and a deviation value of a sampling voltage value corresponding to the first oxygen concentration;
and the equal proportion corresponding relation obtaining unit is used for obtaining the equal proportion corresponding relation between the airway pressure and the deviation value of the sampling voltage according to the ratio of the first difference value to the second difference value.
9. A ventilator, comprising: chemical oxygen sensor, a processor connected to the chemical oxygen sensor, a memory and a computer program stored in the memory and executable on the processor, characterized in that the steps of the method according to claims 1 to 6 are implemented when the computer program is executed by the processor.
10. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to claims 1 to 6.
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