Methods, calibration methods, devices, and apparatuses for expiratory pressure detection for a ventilator

Abstract

The disclosure provides an exhalation pressure detection method, a calibration method and device and equipment for a breathing machine, and relates to the technical field of medical instruments. The exhalation pressure calibration method for the breathing machine comprises the following steps: the driving valve can be controlled to be opened, and a constant driving valve passing gas flow is outputted, so as to generate a gas pressure at an exhalation pressure measurement point by controlling the sealing valve degree of an exhalation valve; when the gas pressure is controlled to be at a pressure control target value, a target gas pressure actual value at the pressure measurement point at the current time is collected; a correlation mapping relationship between the target gas pressure actual value and a sensor detection value is constructed; and the correlation mapping relationship is taken as calibration data of the pressure sensor under each pressure control target value. The technical scheme of the embodiment of the disclosure can effectively improve the calibration pass rate of the pressure sensor, improve the pressure calibration efficiency of the breathing machine, and improve the accuracy of the pressure calibration result.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of medical devices, and in particular, to an exhalation pressure calibration method for a breathing machine, an exhalation pressure detection method for a breathing machine, an exhalation pressure calibration device for a breathing machine, and an electronic device. BACKGROUND

[0002] With the rapid development of medical technology, the application of portable breathing machines has been more and more widely concerned by people. The portable breathing machine can provide breathing support, keep the airway unobstructed by delivering gas (usually oxygen mixed gas) to the patient, and ensure sufficient oxygen supply, which is commonly used in patient emergency transfer, rehabilitation treatment and long-term care scenes. Even if the same pressure sensor is used in the portable breathing machine, there are still differences between different pressure sensors in collecting the same gas pressure, resulting in a large deviation of the exhalation pressure detected by the portable breathing machine.

[0003] At present, in the related exhalation pressure calibration scheme, the exhalation valve is generally controlled by a fixed duty cycle, and the current of the driving valve is controlled from small to large to calibrate the pressure. However, due to the differences of the exhalation valves on different portable breathing machines, there is a large difference in the through flow of the exhalation valve controlled by the same duty cycle, resulting in different exhalation valve sealing valve pressures generated by the exhalation valve. In the extreme case, the pressure of the driving valve end pressure test point cannot reach the threshold value when the sealing valve pressure is too small, which will cause the current of the exhalation valve to constantly try to increase, which is very time-consuming, low in calibration efficiency, and poor in calibration pass rate.

[0004] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present disclosure, and therefore can include information that does not constitute prior art known to those of ordinary skill in the art. SUMMARY

[0005] The purpose of the embodiments of the present disclosure is to provide an exhalation pressure calibration method for a breathing machine, an exhalation pressure detection method for a breathing machine, an exhalation pressure calibration device for a breathing machine, and an electronic device, thereby effectively improving the pressure calibration efficiency and the pressure calibration pass rate of the breathing machine, and improving the accuracy of the calibration result.

[0006] Other characteristics and advantages of the present disclosure will become apparent from the following detailed description, or will be learned by practice of the present disclosure.

[0007] According to a first aspect of the embodiments of the present disclosure, a method for expiratory pressure calibration of a breathing machine is provided, the breathing machine comprising an expiratory valve, a driving valve, and a pressure sensor arranged at an expiratory pressure measurement point, the method comprising: obtaining a plurality of pre-set pressure control target values; controlling the driving valve to be opened and output a constant driving valve through gas flow, so as to generate a gas pressure at the expiratory pressure measurement point by controlling the sealing valve degree of the expiratory valve; collecting a target gas pressure actual value at the expiratory pressure measurement point at a current time when the gas pressure is controlled to be at each of the pressure control target values; obtaining a sensor detection value of the pressure sensor at the current time, constructing a correlation mapping relationship between the target gas pressure actual value and the sensor detection value, and taking the correlation mapping relationship as calibration data of the pressure sensor at each of the pressure control target values.

[0008] In some example embodiments of the present disclosure, based on the foregoing scheme, the expiratory pressure measurement point is arranged at the expiratory valve and a proximal side of an expiratory pipeline of the breathing machine; and the collecting of the target gas pressure actual value at the expiratory pressure measurement point at the current time when the gas pressure is controlled to be at the pressure control target value comprises: cyclically performing the following steps until the gas pressure obtained after adjusting the expiratory valve is equal to the pressure control target value, and taking a newly collected current gas pressure actual value as the target gas pressure actual value at the expiratory pressure measurement point: sampling the gas pressure at the expiratory valve by a standard gas pressure analyzer to obtain a current gas pressure actual value; if it is detected that the current gas pressure actual value is greater than or less than the pressure control target value, determining a pressure difference value between the current gas pressure actual value and the pressure control target value; controlling the sealing valve degree of the expiratory valve according to the pressure difference value, so as to adjust the gas pressure at the expiratory pressure measurement point, and sampling the gas pressure at the expiratory pressure measurement point by the standard gas pressure analyzer to obtain a new current gas pressure actual value.

[0009] In some example embodiments of the present disclosure, based on the foregoing scheme, the controlling of the sealing valve degree of the expiratory valve according to the pressure difference value comprises: inputting the pressure difference value into a pre-set proportional-integral-derivative controller to determine a new control current corresponding to the expiratory valve; and controlling the sealing valve degree of the expiratory valve by the new control current.

[0010] In some example embodiments of the present disclosure, based on the foregoing scheme, the method further comprises: if it is detected that the current gas pressure actual value is equal to the pressure control target value, not adjusting the control current of the expiratory valve, and taking the current gas pressure actual value as the target gas pressure actual value at the expiratory pressure measurement point.

[0011] In some example embodiments of the present disclosure, based on the foregoing scheme, the sampling, by the standard gas pressure analyzer, of the gas pressure at the exhalation pressure measurement point to obtain a current gas pressure actual value comprises: obtaining a preset sampling duration; sampling, by the standard gas pressure analyzer, the gas pressure at the exhalation pressure measurement point within the sampling duration to obtain an original gas pressure actual value; and performing mean value filtering on the original gas pressure actual value to obtain the current gas pressure actual value.

[0012] In some example embodiments of the present disclosure, based on the foregoing scheme, the method further comprises: obtaining a preset pipeline gas leakage detection threshold; and if it is detected that the current gas pressure actual value is less than the pipeline gas leakage detection threshold, determining that calibration fails and generating error information.

[0013] In some example embodiments of the present disclosure, based on the foregoing scheme, before the correlation mapping relationship between the target gas pressure actual value and the sensor detection value is constructed and the correlation mapping relationship is taken as the calibration data of the pressure sensor, the method further comprises: determining monotonicity between the target gas pressure actual value and the sensor detection value; and if it is detected that the monotonicity of the target gas pressure actual value and the sensor detection value is non-monotonically increasing, determining that calibration fails and generating error information.

[0014] According to a second aspect of the embodiments of the present disclosure, a method for detecting exhalation pressure of a breathing machine is provided, the breathing machine comprising a pressure sensor arranged at an exhalation pressure measurement point, the method comprising: when a trigger instruction for outputting exhalation pressure is detected, collecting, by the pressure sensor, a sensor detection value of the gas pressure at the exhalation pressure measurement point; obtaining calibration data according to identification information of the pressure sensor, the calibration data being obtained by the method for calibrating exhalation pressure of a breathing machine in the first aspect; and determining, in the calibration data, a gas pressure actual value corresponding to the sensor detection value.

[0015] According to a third aspect of the embodiments of the present disclosure, an expiratory pressure calibration device for a breathing machine is provided, the breathing machine comprising an expiratory valve, a driving valve, and a pressure sensor arranged at an expiratory pressure measurement point, the device comprising: a pressure target value acquisition module configured to acquire a plurality of pre-set pressure control target values; a gas pressure generation module configured to control the driving valve to be opened and output a constant driving valve through gas flow to generate a gas pressure at the expiratory pressure measurement point by controlling a valve closing degree of the expiratory valve; a pressure actual value acquisition module configured to acquire a target gas pressure actual value at the expiratory pressure measurement point at a current time when the gas pressure is controlled to be at the pressure control target value; and a calibration data generation module configured to acquire a sensor detection value of the pressure sensor at the current time, construct a correlation mapping relationship between the target gas pressure actual value and the sensor detection value, and take the correlation mapping relationship as calibration data of the pressure sensor under each pressure control target value.

[0016] According to a fourth aspect of the embodiments of the present disclosure, an electronic device is provided, comprising: a processor; and a memory having computer readable instructions stored thereon, the computer readable instructions being executed by the processor to implement the expiratory pressure calibration method for a breathing machine in the first aspect, or to implement the expiratory pressure detection method for a breathing machine in the second aspect.

[0017] According to a fifth aspect of the embodiments of the present disclosure, a computer readable storage medium having a computer program stored thereon is provided, the computer program being executed by a processor to implement the expiratory pressure calibration method for a breathing machine in the first aspect, or to implement the expiratory pressure detection method for a breathing machine in the second aspect.

[0018] The technical solutions provided by the embodiments of the present disclosure can include the following beneficial effects:

[0019] The exhalation pressure calibration method for a breathing machine in the example embodiment of the present disclosure can acquire a plurality of pre-set pressure control target values, control the opening of the drive valve to output a constant drive valve through gas flow, and generate gas pressure at the exhalation pressure measurement point by controlling the sealing valve degree of the exhalation valve; then the target gas pressure actual value at the pressure measurement point at the current time can be collected when the closed-loop controlled gas pressure is at each pressure control target value, and then the sensor detection value of the pressure sensor at the current time can be acquired, the correlation mapping relationship between the target gas pressure actual value and the sensor detection value can be constructed, and the correlation mapping relationship can be taken as the calibration data of the pressure sensor under each pressure control target value. On the one hand, the drive valve is controlled to output a constant drive valve through gas flow, and the sealing valve degree of the exhalation valve is closed-loop controlled to control the through flow of the exhalation valve, so as to adjust the gas pressure at the exhalation pressure measurement point. Compared with the related art, the exhalation valve is controlled by a fixed duty ratio, and the pressure calibration is performed by changing the control current of the drive valve from small to large. The problem that the pressure calibration cannot be passed due to the difference of the exhalation valve can be effectively reduced, and the calibration pass rate of the pressure calibration process is improved. On the other hand, the pressure calibration is performed by closed-loop controlling the exhalation valve, which can effectively avoid the problem that the current of the exhalation valve needs to be constantly explored upward due to the difference between the exhalation valves, so that the pressure calibration process period is long, and the calibration efficiency of the pressure calibration process is improved. On the other hand, a plurality of pressure control target values are set, and the target gas pressure actual value at the pressure measurement point at the current time is collected when the closed-loop controlled gas pressure is at each pressure control target value, the calibration data of the pressure sensor under each pressure control target value is constructed, the comprehensiveness of the calibration data is guaranteed, and the accuracy of the calibration data is effectively improved.

[0020] It should be understood that the general description above and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0021] The drawings incorporated in the specification and constituting a part of the specification illustrate embodiments consistent with the present disclosure and, together with the specification, serve to explain the principles of the present disclosure. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0022] Figure 1 The schematic diagram of the exhalation pressure calibration method for a breathing machine according to some embodiments of the present disclosure is schematically shown.

[0023] Figure 2 The flowchart of measuring the target gas pressure actual value at the exhalation pressure measurement point according to some embodiments of the present disclosure is schematically shown.

[0024] Figure 3 A flowchart schematically illustrates a process of sampling a current gas pressure actual value according to some embodiments of the present disclosure.

[0025] Figure 4 A flowchart schematically illustrates a process of expiratory pressure calibration according to some embodiments of the present disclosure.

[0026] Figure 5 A flowchart schematically illustrates a process of expiratory pressure detection for a ventilator according to some embodiments of the present disclosure.

[0027] Figure 6 A schematic diagram schematically illustrates an expiratory pressure calibration device for a ventilator according to some embodiments of the present disclosure.

[0028] Figure 7 A schematic diagram schematically illustrates an expiratory pressure detection device for a ventilator according to some embodiments of the present disclosure.

[0029] Figure 8 A structural diagram schematically illustrates a computer system of an electronic device according to some embodiments of the present disclosure.

[0030] Figure 9 A schematic diagram schematically illustrates a computer readable storage medium according to some embodiments of the present disclosure.

[0031] In the drawings, like or corresponding reference numerals indicate identical or corresponding parts. DETAILED DESCRIPTION

[0032] The exemplary embodiments will be described in detail herein below with reference to the accompanying drawings. The following description is merely exemplary in nature and is not intended to limit the present disclosure, application, and uses to which it is subject. Rather, the exemplary embodiments are provided as illustrative examples so as to facilitate an understanding of the present disclosure.

[0033] The terminology used in this description is for the purpose of describing particular embodiments only and is not intended to limit the present disclosure. As used in this description 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 will 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.

[0034] It should be understood that, although the terms first, second, third, etc. can be used herein to describe various information, the information should not be limited to these terms. These terms are only used to differentiate one piece of information from another. For example, a first information can also be termed a second information without departing from the scope of the present disclosure, similarly, a second information can also be termed a first information. The word "if" can be interpreted as meaning "when" or "upon" or "in response to determining," depending on the context, as used herein.

[0035] Example implementations will now be described more fully with reference to the accompanying drawings. Example implementations may, however, be implemented in many different forms and should not be construed as limited to the examples set forth herein; rather, these implementations are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example implementations to those skilled in the art.

[0036] Moreover, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the

[0037] In addition, the accompanying drawings are only schematic and are non-limiting precise representations of embodiments of the application. The functions of the various elements shown in the figures can be provided through the use of dedicated hardware as well as hardware capable of executing software in association with appropriate software. When provided by a processor, the functions can be provided by a single dedicated processor, by a single shared processor, or by a plurality of individual processors, some of which can be shared.

[0038] In the present example embodiment, first provided is an expiratory pressure calibration method for a breathing machine, which can be applied to a terminal device as a test or a server as a test. The method is described below with the terminal device as an example.

[0039] Optionally, the ventilator can at least include an exhalation valve, a driving valve, and a pressure sensor arranged at an exhalation pressure measurement point, wherein the exhalation valve refers to a device for controlling and adjusting the exhalation of gas in the ventilator, which is generally arranged in the exhalation pipeline; the driving valve refers to a device for simulating human exhalation in the ventilator test and calibration process, which can simulate the entire exhalation process of the human body by adjusting the size of the driving valve flow rate, so as to complete the calibration of the ventilator; the pressure sensor refers to a sensor arranged in the exhalation pipeline for measuring the gas pressure at the exhalation pressure measurement point.

[0040] Figure 1 A schematic diagram of an exhalation pressure calibration method for a ventilator according to some embodiments of the present disclosure is shown schematically. Referring to Figure 1 As shown, the exhalation pressure calibration method for a ventilator can include the following steps:

[0041] Step S110, obtaining a plurality of pre-set pressure control target values;

[0042] Step S120, controlling the driving valve to open and output a constant driving valve through gas flow, so as to generate a gas pressure at the exhalation pressure measurement point by controlling the degree of the exhalation valve;

[0043] Step S130, when the closed-loop control of the gas pressure is at each pressure control target value, respectively, acquiring the target gas pressure actual value at the exhalation pressure measurement point at the current time;

[0044] Step S140, obtaining the sensor detection value of the pressure sensor at the current time, constructing the correlation mapping relationship between the target gas pressure actual value and the sensor detection value, and taking the correlation mapping relationship as the calibration data of the pressure sensor under each pressure control target value.

[0045] According to the exhalation pressure calibration method for a breathing machine in the present disclosure, in one aspect, the constant driving valve through gas flow is controlled, and the closing valve degree of the exhalation valve is closed-loop controlled to control the through flow of the exhalation valve, so as to realize the adjustment of the gas pressure at the exhalation pressure measurement point. Compared with the related art, the exhalation valve is controlled by a fixed duty ratio, and the pressure calibration is performed by changing the control current of the driving valve from small to large. The problem that the pressure calibration cannot be passed due to the difference of the exhalation valve can be effectively reduced, and the calibration pass rate of the pressure calibration process is improved. In another aspect, the pressure calibration is realized by closed-loop control of the exhalation valve, which can effectively avoid the problem that the current of the exhalation valve needs to be constantly explored upward due to the difference between the exhalation valves in the related art, and the pressure calibration process period is long, thereby improving the calibration efficiency of the pressure calibration process. In still another aspect, a plurality of pressure control target values are set, and the target gas pressure actual value at the pressure measurement point at the current time is collected when the gas pressure is closed-loop controlled at each pressure control target value, and the calibration data of the pressure sensor at each pressure control target value is constructed, so as to ensure the comprehensiveness of the calibration data and effectively improve the accuracy of the calibration data.

[0046] In the following, the exhalation pressure calibration method for a breathing machine in the present example embodiment will be further described.

[0047] In step S110, a plurality of pre-set pressure control target values are obtained.

[0048] In the present example embodiment, the pressure control target value refers to a pre-set calibration value for calibrating the pressure sensor in the breathing machine. For example, the pressure control target value can be 4kpa or 3kpa. The pressure control target value can be self-defined according to actual conditions, and the present example embodiment does not make special limitation thereto.

[0049] The plurality of pre-set pressure control target values can be stored in a table in advance, and the pressure control target values are sequentially obtained from the table in order to perform pressure calibration in the process of starting pressure calibration. The pressure control target values in the table can be sorted from small to large or from large to small, and the present example embodiment does not make special limitation thereto. Of course, the plurality of pressure control target values required for this pressure calibration can be input through a graphical user interface before each pressure calibration starts, and arranged in a certain order and stored in the memory for calling. The present example embodiment does not make special limitation to the obtaining method of the pressure control target value.

[0050] The plurality of pressure control target values can be preset according to the expiration pressure of the human body, so as to ensure that the plurality of pressure control target values cover more pressure detection ranges as possible, and ensure the comprehensiveness and effectiveness of the calibration result; meanwhile, the plurality of pressure control target values are sorted in a predetermined order, and the pressure control target values are called in sequence when the pressure control target values are calibrated, so as to improve the efficiency of the pressure calibration.

[0051] In step S120, the driving valve is controlled to be opened, and a constant driving valve through gas flow is output, so as to generate a gas pressure at the expiration pressure measurement point by controlling the sealing valve degree of the expiration valve.

[0052] In an example embodiment of the present application, the driving valve refers to a device used for simulating human expiration in the ventilator test and calibration process, and the whole human expiration process can be simulated by adjusting the size of the driving valve through flow, so as to complete the calibration of the ventilator.

[0053] The expiration pressure measurement point refers to a position at which a pressure sensor is arranged in an expiration pipeline of the ventilator, for example, the expiration pressure measurement point can be arranged at the expiration valve, that is, the distal end of the expiration pipeline, or can be arranged at one end close to the driving valve in the expiration pipeline, that is, the proximal end of the expiration pipeline, of course, the expiration pressure measurement point can also be arranged at an intermediate section of the expiration pipeline, and the arrangement position of the expiration pressure measurement point is not particularly limited in the example embodiment.

[0054] The driving valve can be controlled to be opened, and a constant driving valve through gas flow is output in the process of ventilator pressure calibration, compared with adjusting the driving valve through gas flow by controlling the current from small to large, directly controlling the driving valve to output a constant driving valve through gas flow can effectively avoid the interference factors caused by the opening consistency of the driving valve, and ensure the accuracy of the pressure calibration result.

[0055] In the case of ensuring the constant driving valve through gas flow, different gas pressures are generated at the expiration pressure measurement point by controlling the sealing valve degree of the expiration valve, and the obtained gas pressure is more stable.

[0056] In step S130, when the gas pressure is controlled to be at each pressure control target value in a closed loop, the target gas pressure actual value at the expiration pressure measurement point at the current time is collected.

[0057] In an example embodiment of the present application, the closed loop control refers to a control mode of correcting according to the output feedback of the control object, and the closed loop control in the embodiment can correct the gas pressure actual value by adjusting the control current of the expiration valve when the gas pressure actual value deviates from the pressure control target value.

[0058] The target gas pressure actual value refers to a gas pressure actual value corresponding to each pressure control target value in a set of gas pressure actual values collected at the pressure measurement point during the closed-loop control of the exhalation valve.

[0059] The gas pressure actual value at the exhalation pressure measurement point can be measured by a standard gas pressure analyzer outside the ventilator, which can effectively improve the accuracy of the gas pressure actual value.

[0060] The target gas pressure actual value corresponding to the first pressure control target value at the pressure measurement point at the current time can be collected when the closed-loop controlled gas pressure is at the first pressure control target value in the table, and then the second pressure control target value can be obtained from the table, and the target gas pressure actual value corresponding to the second pressure control target value at the pressure measurement point at the current time can be collected when the closed-loop controlled gas pressure is at the second pressure control target value in the table, and so on, until the pressure control target values in the table are all calibrated, i.e., the target gas pressure actual value can be a set of gas pressure actual values of the gas pressure at each pressure control target value.

[0061] In step S140, the sensor detection value of the pressure sensor at the current time is obtained, an associated mapping relationship between the target gas pressure actual value and the sensor detection value is constructed, and the associated mapping relationship is taken as the calibration data of the pressure sensor at each pressure control target value.

[0062] In an example embodiment of the present disclosure, the sensor detection value refers to the sensor reading, i.e., the analog to digital conversion value (ADC, A / D), of the pressure sensor arranged at the exhalation pressure measurement point when the pressure sensor detects the gas pressure at the exhalation pressure measurement point.

[0063] When the closed-loop controlled gas pressure is at each pressure control target value, the target gas pressure actual value at the exhalation pressure measurement point at the current time is collected, and the sensor detection value can be obtained by the pressure sensor arranged at the exhalation pressure measurement point, and then the associated mapping relationship between the target gas pressure actual value and the sensor detection value can be constructed.

[0064] Due to the differences between individual pressure sensors, the sensor detection values detected for the same gas pressure are not the same, so by controlling the gas pressure at the exhalation pressure measurement point to be at the pressure control target value, the target gas pressure actual value and the sensor detection value at the exhalation pressure measurement point are obtained at the same time, and the target gas pressure actual value is taken as the calibration data of the pressure sensor when outputting the sensor detection value, thereby realizing the pressure calibration of the pressure sensor in the exhalation pipeline of the ventilator.

[0065] The control drive valve opens a constant drive valve through which gas flows, and the closed-loop control of the exhalation valve's sealing degree controls the flow through the exhalation valve, thereby adjusting the gas pressure at the exhalation pressure measurement point. Compared with the related art in which the exhalation valve is controlled by a fixed duty cycle, and pressure calibration is performed by controlling the control current of the drive valve from small to large, the problem of pressure calibration failing due to differences in the exhalation valve can be effectively reduced, thereby improving the calibration pass rate of the pressure calibration process.

[0066] The method of achieving pressure calibration through closed-loop control of the exhalation valve can effectively avoid the problem in related technologies that the current of the exhalation valve needs to be continuously tested upward due to differences between individual exhalation valves, which makes the pressure calibration process cycle longer, thereby improving the calibration efficiency of the pressure calibration process.

[0067] By setting multiple pressure control target values ​​and collecting the actual value of the target gas pressure at the current pressure measurement point when the gas pressure is at each pressure control target value through closed-loop control, the calibration data of the pressure sensor under each pressure control target value is constructed to ensure the comprehensiveness of the calibration data coverage and effectively improve the accuracy of the calibration data.

[0068] Next, the contents of step S110 to step S140 are explained.

[0069] In an exemplary embodiment of the present disclosure, the expiratory pressure measurement points can be set at the expiratory valve and the proximal end of the expiratory circuit of the ventilator. The expiratory valve is set at the end of the expiratory circuit away from the human body, and the proximal end of the expiratory circuit is set at the end of the expiratory circuit close to the human body. Compared with the gas pressure at other locations, the gas pressure at the proximal and distal ends of the expiratory circuit is more representative. The pressure calibration process at each expiratory pressure measurement point is basically the same, and the only difference is the location of the expiratory pressure measurement point for measuring the actual gas pressure. No distinction will be made in the following description.

[0070] Optionally, you can pass Figure 2 The steps in the embodiment are to collect the actual value of the target gas pressure at the exhalation pressure measurement point at the current moment when the closed-loop control gas pressure is at the pressure control target value, and refer to Figure 2 Specifically, it may include:

[0071] Step S210, looping through the following steps until the gas pressure obtained after adjusting the exhalation valve is equal to the pressure control target value, and using the newly acquired current gas pressure actual value as the target gas pressure actual value at the exhalation pressure measurement point:

[0072] Step S220, sampling the gas pressure at the exhalation pressure measurement point by a standard gas pressure analyzer to obtain a current actual gas pressure value;

[0073] In step S230, if the current gas pressure actual value is greater than or less than the pressure control target value, a pressure difference between the current gas pressure actual value and the pressure control target value is determined.

[0074] In step S240, the valve closing degree of the exhalation valve is controlled according to the pressure difference, so as to adjust the gas pressure at the exhalation pressure measurement point, and the gas pressure at the exhalation pressure measurement point is sampled by the standard gas pressure analyzer to obtain a new current gas pressure actual value.

[0075] The standard gas pressure analyzer is a device specially used for measuring gas pressure after calibration. Compared with the pressure sensor in the breathing machine, the gas pressure measured by the standard gas pressure analyzer can accurately reflect the true value of the gas pressure, and the pressure calibration can be assisted by the standard gas pressure analyzer outside the breathing machine.

[0076] The current gas pressure actual value is the gas pressure value measured at the exhalation pressure measurement point by the standard gas pressure analyzer during pressure calibration, and the new current gas pressure actual value is the new gas pressure value measured at the exhalation pressure measurement point by the standard gas pressure analyzer after adjusting the valve closing degree of the exhalation valve.

[0077] The current gas pressure actual value detected by the standard gas pressure analyzer can be compared with the pre-set pressure control target value. If the current gas pressure actual value is greater than or less than the pressure control target value, the pressure difference between the current gas pressure actual value and the pressure control target value is determined. Then, the valve closing degree of the exhalation valve can be controlled according to the pressure difference, the gas pressure at the exhalation pressure measurement point is adjusted by adjusting the valve closing degree, and then the gas pressure at the exhalation pressure measurement point is sampled by the standard gas pressure analyzer to obtain a new current gas pressure actual value. When the gas pressure after adjusting the exhalation valve is equal to the pressure control target value, the new current gas pressure actual value collected at this time is taken as the target gas pressure actual value at the exhalation pressure measurement point.

[0078] By closed-loop control of the gas pressure at the exhalation pressure measurement point to be at the pressure control target value, the gas pressure at the exhalation pressure measurement point can be quickly adjusted to a desired approximate range. Compared with adjusting the current value by trial and error to make the gas pressure at the exhalation pressure measurement point be at the pressure control target value, the number of adjustments can be effectively reduced, the period of pressure calibration can be shortened, and the efficiency of pressure calibration can be improved.

[0079] Optionally, when the current gas pressure actual value is detected to be equal to the pressure control target value, the control current of the exhaust valve is not adjusted, and the current gas pressure actual value is taken as the target gas pressure actual value at the exhalation pressure measurement point.

[0080] Optionally, when the exhaust valve is controlled according to the pressure difference value, the pressure difference value can be input into a preset proportional-integral-derivative controller to determine a new control current corresponding to the exhaust valve, and then the new control current can be used to control the sealing degree of the exhaust valve.

[0081] The proportional-integral-derivative controller (PID) is a closed-loop control system that can form a control amount by linear combination of the proportion, integral, and derivative of the deviation between the pressure control target value and the current gas pressure actual value, and control the control current corresponding to the exhaust valve.

[0082] Through the proportional-integral-derivative controller, the control current corresponding to the exhaust valve is controlled in a closed loop and negatively fed back, so that the gas pressure at the exhalation pressure measurement point can be quickly brought into a roughly determined flow range, which can effectively reduce the calibration time and improve the pressure calibration efficiency.

[0083] In an optional embodiment, the sampling of the gas pressure at the exhalation pressure measurement point by the standard gas pressure analyzer to obtain the current gas pressure actual value can be implemented through the steps of Figure 3 As shown in FIG. 4, the sampling of the gas pressure at the exhalation pressure measurement point by the standard gas pressure analyzer to obtain the current gas pressure actual value can specifically include the following steps. Figure 3

[0084] Step S310: Obtain a preset sampling duration.

[0085] Step S320: Sample the gas pressure at the exhalation pressure measurement point within the sampling duration by the standard gas pressure analyzer to obtain an original gas pressure actual value.

[0086] Step S330: Perform mean value filtering on the original gas pressure actual value to obtain the current gas pressure actual value.

[0087] The sampling duration refers to a sampling period during which the gas pressure at the exhalation pressure measurement point is continuously sampled. For example, the sampling duration can be 1 s or 5 s, and the present example embodiment does not limit the sampling duration. The original gas pressure actual value refers to an original value obtained by sampling the gas pressure at the exhalation pressure measurement point by the standard gas pressure analyzer.

[0088] ​Due to the instability of gas flow, the noise of the actual gas pressure value collected at different times is large. The original gas pressure actual value in a certain time can be collected by the sampling time, and the current gas pressure actual value can be obtained by mean filtering the original gas pressure actual value, which can effectively reduce the influence of sampling noise on pressure calibration and improve the accuracy of the current gas pressure actual value obtained by sampling.

[0089] Optionally, a preset pipeline gas leakage detection threshold can be obtained. If it is detected that the current gas pressure actual value is less than the pipeline gas leakage detection threshold, it is determined that the calibration fails, and error information is generated. Of course, if it is detected that the current gas pressure actual value is greater than or equal to the pipeline gas leakage detection threshold, it is determined that the ventilator does not have a fault, and the pressure calibration process can continue.

[0090] The pipeline gas leakage detection threshold refers to a parameter for detecting whether the exhalation pipeline has a gas leakage condition. When the exhalation pipeline leaks, the current gas pressure actual value obtained will be significantly lower than a certain regular value, and the regular value can be used as the pipeline gas leakage detection threshold.

[0091] When it is detected that the current gas pressure actual value is less than the pipeline gas leakage detection threshold, it can be considered that the exhalation pipeline has a gas leakage condition, and at this time, the pressure calibration of the ventilator cannot be continued. Therefore, it can be determined that the calibration fails, and error information is generated to alert the staff to repair the ventilator fault in time.

[0092] By setting the pipeline gas leakage detection threshold, the ventilator with a fault can be effectively screened out, avoiding the situation that the pressure calibration cannot be passed due to the ventilator fault, improving the pressure calibration efficiency. At the same time, the inaccuracy of the calibration data obtained by the pressure calibration due to the ventilator fault is avoided, and the accuracy of the pressure calibration is improved.

[0093] In an example embodiment of the present disclosure, before the correlation mapping relationship between the target gas pressure actual value and the sensor detection value is constructed and the correlation mapping relationship is used as the calibration data of the pressure sensor, the monotonicity between the target gas pressure actual value and the sensor detection value can be determined. If it is detected that the monotonicity of the target gas pressure actual value and the sensor detection value is non-monotonically increasing, it is determined that the calibration fails, and error information is generated. Of course, if it is detected that the monotonicity of the target gas pressure actual value and the sensor detection value is monotonically increasing, it is determined that the detected data is not a problem, and the correlation mapping relationship between the target gas pressure actual value and the sensor detection value is continued to be constructed, and the correlation mapping relationship is used as the calibration data of the pressure sensor.

[0094] By determining the monotonicity between the target gas pressure actual value and the sensor detection value, the target gas pressure actual value and the sensor detection value that may have problems can be quickly screened out, the problem that the calibration data is inaccurate due to possible problems in the pressure calibration process is avoided, and the accuracy of the pressure calibration result is effectively improved.

[0095] Figure 4 A flowchart of exhalation pressure calibration is schematically shown according to some embodiments of the present disclosure.

[0096] Reference Figure 4 As shown, in step S401, the control drive valve is opened, and a larger constant drive valve through gas flow is output; in step S402, N pressure control target values arranged in a certain order in a pre-set table are obtained; in step S403, Number is set to 1, and Number can represent the serial number of the pressure control target value after ordering; in step S404, it is determined whether Number is greater than N. If Number is greater than N, it is determined that the current pressure calibration process is ended, otherwise step S405 is executed; in step S405, the Number-th pressure control target value in the table is taken as a control target to perform closed-loop control on the exhalation valve to adjust the gas pressure at the exhalation pressure measurement point; in step S406, the original gas pressure actual value returned by the standard gas pressure analyzer is collected; in step S407, the original gas pressure actual value is subjected to mean value filtering to obtain the current gas pressure actual value; in step S408, the current gas pressure actual value and the sensor detection value are recorded; in step S409, it is determined whether the current gas pressure actual value is greater than the pipeline gas leakage detection threshold value. If the current gas pressure actual value is greater than the pipeline gas leakage detection threshold value, step S410 is executed, otherwise it is considered that the exhalation pipeline of the ventilator has a gas leakage fault, the pressure calibration fails, and error information is generated; in step S410, it is determined whether the current gas pressure actual value and the sensor detection value meet the monotonicity. If the monotonicity is met, step S412 is executed, otherwise step S411 is executed; in step S411, the calibration is stopped, and it is prompted that the data does not meet the monotonicity; in step S412, Number is incremented, that is, the next pressure control target value in the table is selected, and step S404 is returned.

[0097] In summary, a plurality of preset pressure control target values can be obtained, and the drive valve is controlled to be opened to output a constant drive valve through gas flow, and the gas pressure at the exhalation pressure measurement point is generated by controlling the sealing valve degree of the exhalation valve; then, when the closed-loop controlled gas pressure is at each pressure control target value, the target gas pressure actual value at the pressure measurement point at the current time can be collected, and then the sensor detection value of the pressure sensor at the current time can be obtained, the correlation mapping relationship between the target gas pressure actual value and the sensor detection value is constructed, and the correlation mapping relationship is taken as the calibration data of the pressure sensor under each pressure control target value. On the one hand, the drive valve is controlled to output a constant drive valve through gas flow, and the sealing valve degree of the exhalation valve is closed-loop controlled to control the through flow of the exhalation valve, so as to adjust the gas pressure at the exhalation pressure measurement point. Compared with the related art, the exhalation valve is controlled by a fixed duty ratio, and the control current of the drive valve is changed from small to large to calibrate the pressure, which can effectively reduce the problem that the pressure calibration cannot be passed due to the difference of the exhalation valve, and improve the calibration pass rate of the pressure calibration process. On the other hand, the exhalation valve is closed-loop controlled to calibrate the pressure, which can effectively avoid the problem that the current of the exhalation valve needs to be constantly explored upward due to the difference between the exhalation valves, so that the pressure calibration process period is long, and the calibration efficiency of the pressure calibration process is improved. On the other hand, a plurality of pressure control target values are set, and the target gas pressure actual value at the pressure measurement point at the current time is collected when the closed-loop controlled gas pressure is at each pressure control target value, and the calibration data of the pressure sensor under each pressure control target value is constructed, so as to ensure the comprehensiveness of the calibration data and effectively improve the accuracy of the calibration data.

[0098] In addition, the disclosure also provides an exhalation pressure detection method for a breathing machine, wherein the breathing machine comprises a pressure sensor arranged at an exhalation pressure measurement point, and the exhalation pressure detection method for the breathing machine can be executed by the breathing machine. Referring to Figure 5 As shown, it can specifically include:

[0099] Step S510, when the trigger instruction of outputting the exhalation pressure is detected, the sensor detection value of the gas pressure at the exhalation pressure measurement point is collected by the pressure sensor;

[0100] Step S520, obtaining calibration data according to the identification information of the pressure sensor, wherein the calibration data is obtained by the exhalation pressure calibration method for the breathing machine;

[0101] Step S530, determining the gas pressure actual value corresponding to the sensor detection value in the calibration data.

[0102] The trigger instruction refers to a control instruction for detecting the gas pressure at the exhalation pressure measurement point of the exhalation pipeline. For example, the trigger instruction can be a control instruction generated by a gas pressure display unit on the ventilator when the gas pressure needs to be displayed, a control instruction generated by a user by pressing a gas pressure display button, or a control instruction generated by a user when adjusting the target gas pressure through a gas pressure knob. The present example embodiment does not make special limitations on the generation mode of the trigger instruction.

[0103] One or more pressure sensors can be arranged at different exhalation pressure measurement points in the ventilator. Therefore, the calibration data corresponding to the pressure sensor currently receiving the trigger instruction can be obtained through the identification information of the pressure sensor, and the actual gas pressure value corresponding to the current sensor detection value can be obtained through the associated mapping relationship between the sensor detection value and the actual gas pressure value in the calibration data.

[0104] The calibration data of the pressure sensor can assist in detecting the gas pressure in the exhalation pipeline, which can effectively avoid the problem that the detected gas pressure is inaccurate due to the difference in A / D values of the same gas pressure caused by the individual difference of the pressure sensor, and improve the gas pressure detection accuracy of the pressure sensor.

[0105] It should be noted that although the steps of the method in the present disclosure are described in a specific order in the accompanying drawings, this does not require or imply that the steps must be performed in this specific order, or that all the steps shown must be performed to achieve the desired result. In addition or alternatively, some steps can be omitted, multiple steps can be combined into one step, and / or one step can be divided into multiple steps, etc.

[0106] In addition, in the present example embodiment, an exhalation pressure calibration device for a ventilator is also provided. Referring to Figure 6 As shown in the figure, the exhalation pressure calibration device 600 for the ventilator includes a pressure target value acquisition module 610, a gas pressure generation module 620, a pressure actual value acquisition module 630, and a calibration data generation module 640. Wherein:

[0107] The pressure target value acquisition module 610 is configured to acquire a plurality of pre-set pressure control target values;

[0108] The gas pressure generation module 620 is configured to control the opening of the driving valve and output a constant driving valve passing gas flow to generate gas pressure at the exhalation pressure measurement point by controlling the degree of the exhalation valve.

[0109] The pressure actual value acquisition module 630 is configured to, when the closed-loop control of the gas pressure is at the pressure control target value, collect a target gas pressure actual value at the exhalation pressure measurement point at the current time;

[0110] The calibration data generation module 640 is configured to collect a sensor detection value of the pressure sensor at the current time, construct a correlation mapping relationship between the target gas pressure actual value and the sensor detection value, and take the correlation mapping relationship as calibration data of the pressure sensor under each pressure control target value.

[0111] In an example embodiment of the present disclosure, based on the foregoing scheme, the exhalation pressure measurement point is arranged at the exhalation valve and the proximal side of the exhalation pipeline of the ventilator; the pressure actual value acquisition module 630 can be configured to:

[0112] The following steps are cyclically executed until the gas pressure obtained after adjusting the exhalation valve is equal to the pressure control target value, and the new current gas pressure actual value collected is taken as the target gas pressure actual value at the exhalation pressure measurement point:

[0113] The gas pressure at the exhalation pressure measurement point is sampled by a standard gas pressure analyzer to obtain a current gas pressure actual value;

[0114] If it is detected that the current gas pressure actual value is greater than or less than the pressure control target value, a pressure difference value between the current gas pressure actual value and the pressure control target value is determined;

[0115] The closure degree of the exhalation valve is controlled according to the pressure difference value to realize adjustment of the gas pressure at the exhalation pressure measurement point, and the gas pressure at the exhalation pressure measurement point is sampled by the standard gas pressure analyzer to obtain a new current gas pressure actual value.

[0116] In an example embodiment of the present disclosure, based on the foregoing scheme, the control of the closure degree of the exhalation valve according to the pressure difference value includes:

[0117] The pressure difference value is input into a preset proportional-integral-derivative controller to determine a new control current corresponding to the exhalation valve;

[0118] The closure degree of the exhalation valve is controlled by the new control current.

[0119] In an example embodiment of the present disclosure, based on the foregoing scheme, the method further includes:

[0120] If it is detected that the current gas pressure actual value is equal to the pressure control target value, the control current of the exhalation valve is not adjusted, and the current gas pressure actual value is used as the target gas pressure actual value at the exhalation pressure measurement point.

[0121] In an exemplary embodiment of the present disclosure, based on the aforementioned solution, sampling the gas pressure at the exhalation pressure measurement point by a standard gas pressure analyzer to obtain the current actual gas pressure value includes:

[0122] Get the preset sampling duration;

[0123] Sampling the gas pressure at the exhalation pressure measurement point within the sampling time by the standard gas pressure analyzer to obtain an actual value of the original gas pressure;

[0124] The original gas pressure actual value is mean filtered to obtain the current gas pressure actual value.

[0125] In an exemplary embodiment of the present disclosure, based on the above solution, the method further includes:

[0126] Obtain the preset pipeline leakage detection threshold;

[0127] If it is detected that the current actual gas pressure value is less than the pipeline leakage detection threshold, it is determined that the calibration has failed and an error message is generated.

[0128] In an exemplary embodiment of the present disclosure, based on the aforementioned solution, before establishing an association mapping relationship between the actual value of the target gas pressure and the sensor detection value and using the association mapping relationship as calibration data for the pressure sensor, the method further includes:

[0129] Determining the monotonicity between the actual value of the target gas pressure and the sensor detection value;

[0130] If it is detected that the monotonicity of the actual value of the target gas pressure and the sensor detection value is non-monotonically increasing, it is determined that the calibration has failed, and an error message is generated.

[0131] In addition, in this exemplary embodiment, an exhalation pressure detection device for a ventilator is also provided. Figure 7 As shown, the expiratory pressure detection device 700 for a ventilator includes: a pressure target value acquisition module 710, a gas pressure generation module 720, a pressure actual value acquisition module 730 and a calibration data generation module 740. Among them:

[0132] The exhalation pressure detection module 710 is configured to obtain a sensor detection value of the gas pressure at the exhalation pressure measurement point through the pressure sensor when a trigger instruction to output the exhalation pressure is detected;

[0133] a calibration data acquisition module 720, configured to acquire calibration data according to identification information of the pressure sensor, wherein the calibration data is obtained by the expiratory pressure calibration method for a ventilator according to an embodiment of the present disclosure;

[0134] The exhalation pressure calibration module 730 determines the actual gas pressure value corresponding to the sensor detection value in the calibration data.

[0135] The specific details of each module of the above-mentioned expiratory pressure calibration device for a ventilator or the expiratory pressure detection device for a ventilator have been described in detail in the corresponding expiratory pressure calibration method for a ventilator or the expiratory pressure detection method for a ventilator, and therefore will not be repeated here.

[0136] It should be noted that although several modules or units of the expiratory pressure calibration device for a ventilator or the expiratory pressure detection device for a ventilator are mentioned in the above detailed description, this division is not mandatory. In fact, according to the embodiments of the present disclosure, the features and functions of two or more modules or units described above can be embodied in one module or unit. Conversely, the features and functions of one module or unit described above can be further divided to be embodied by multiple modules or units.

[0137] In addition, in an exemplary embodiment of the present disclosure, an electronic device capable of implementing the above-mentioned exhalation pressure calibration method for a ventilator or the exhalation pressure detection method for a ventilator is also provided.

[0138] Those skilled in the art will appreciate that various aspects of the present disclosure may be implemented as systems, methods, or program products. Therefore, various aspects of the present disclosure may be implemented in the following forms: a complete hardware embodiment, a complete software embodiment (including firmware, microcode, etc.), or an embodiment combining hardware and software aspects, which may be collectively referred to herein as a "circuit," "module," or "system."

[0139] Refer to the following Figure 8 800 according to this embodiment of the present disclosure will be described. Figure 8 The electronic device 800 shown is merely an example and should not limit the functions and scope of use of the embodiments of the present disclosure.

[0140] like Figure 8As shown, the electronic device 800 is in the form of a general computing device. Components of the electronic device 800 can include, but are not limited to, the at least one processing unit 810 described above, the at least one storage unit 820 described above, a bus 830 that connects the different system components, including the storage unit 820 and the processing unit 810, a display unit 840.

[0141] The storage unit stores program codes that can be executed by the processing unit 810, so that the processing unit 810 performs the steps described in the above “Exemplary Method” section according to various exemplary embodiments of the present disclosure. For example, the processing unit 810 can perform the steps shown in FIG. 1, such as Figure 1 As shown in step S110, a plurality of pressure control target values are obtained in advance. In step S120, the driving valve is controlled to be opened, and a constant driving valve through gas flow is outputted, so as to generate a gas pressure at the exhalation pressure measurement point by controlling the sealing valve degree of the exhalation valve. In step S130, when the closed-loop control of the gas pressure is at each of the pressure control target values, the target gas pressure actual value at the exhalation pressure measurement point at the current time is collected. In step S140, the sensor detection value of the pressure sensor at the current time is obtained, a correlation mapping relationship between the target gas pressure actual value and the sensor detection value is constructed, and the correlation mapping relationship is taken as the calibration data of the pressure sensor under each of the pressure control target values.

[0142] The storage unit 820 can include a readable medium in the form of a volatile storage unit, such as a random access memory (RAM) 821 and / or a cache memory 822, and can further include a read-only memory (ROM) 823.

[0143] The storage unit 820 can further include program / utility 824 having a set of program modules 825, including but not limited to, an operating system, one or more application programs, other program modules, and program data, each of which or a combination thereof can include implementation of a network environment.

[0144] The bus 830 can represent one or more of several types of bus structures, including a storage unit bus or storage unit controller, a peripheral bus, a graphics acceleration port, a processing unit bus, or a local bus using any of a variety of bus architectures.

[0145] The electronic device 800 can also communicate with one or more external devices 870 such as a keyboard or pointing devices, a Bluetooth device, or a database via I / O interface 850. Additionally, the electronic device 800 can communicate with one or more devices that enable user interaction with the electronic device 800, and / or one or more devices that enable communication of the electronic device 800 with other computing devices. Such communication can occur via an I / O interface 850. Still yet, the electronic device 800 can communicate with one or more networks such as a local area network (LAN), a general wide area network (WAN), and / or a public network (e.g., the Internet) via a network adapter 860. As depicted, the network adapter 860 is in communication with the other components of the electronic device 800 via a bus 830. It should be appreciated that the bus 830 can be one of any suitable type and that the bus 830 can include any suitable bridges, controllers, or adapters in order to enable communication between the various components of the electronic device 800.

[0146] With the above implementation, those skilled in the art can easily understand that the example embodiments described herein can be implemented by software, or by software in combination with necessary hardware. Therefore, the technical solutions according to the embodiments of the present disclosure can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash disk, a mobile hard disk, or the like) or a network, and includes a number of instructions to enable a computing device (which can be a personal computer, a server, a terminal device, or a network device, etc.) to perform the methods according to the embodiments of the present disclosure.

[0147] In the example embodiments of the present disclosure, a computer readable storage medium is also provided, which stores a program product capable of implementing the above-mentioned methods of the present disclosure. In some possible embodiments, various aspects of the present disclosure can also be implemented in the form of a program product, which includes program codes for causing a terminal device to perform the steps described in the above-mentioned "example method" section according to various example embodiments of the present disclosure when the program product is run on the terminal device.

[0148] Reference Figure 9 As shown, a program product 900 for implementing the above-mentioned method for calibrating the expiratory pressure of a ventilator according to the embodiments of the present disclosure is described, which can adopt a portable compact disc read-only memory (CD-ROM) and includes program codes, and can be run on a terminal device, such as a personal computer. However, the program product of the present disclosure is not limited to this, and in this document, the readable storage medium can be any tangible medium containing or storing a program, which can be used or combined with an instruction execution system, device, or apparatus.

[0149] The program product can employ any combination of one or more computer-readable media. The computer-readable media can be a computer-readable storage medium or a computer-readable signal medium. The computer-readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer-readable storage medium include the following: an electrical connection having one or more wires, a portable disc, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0150] The computer-readable signal medium can include a computer-readable storage medium that is configured to store and deliver a computer-readable program code. The computer-readable program code can be propagated as a computer-readable signal medium.

[0151] The program code embodied on the computer-readable media can be transmitted using any appropriate medium, including but not limited to wireless, wired, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

[0152] The program code for carrying out operations of the present disclosure can be written in any combination of one or more programming languages, including an object-oriented programming language such as Java, C++, etc., or conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code can execute entirely on the user's computing device, partly on the user's device, as a stand-alone software package, partly on the user's device and partly on a remote computing device or entirely on the remote computing device or server. In the latter scenario, the remote computing device can be connected to the user's device through any type of network, including a local area network (LAN) or a wide area network (WAN), or the connection can be made to an external computing device, such as through the Internet using an Internet Service Provider.

[0153] In addition, the above-described flowcharts are merely illustrative of the processes included in the method according to the exemplary embodiments of the present disclosure, and are not intended to limit the purpose. It is readily understood that the processes shown in the above-described flowcharts do not indicate or limit the time sequence of the processes. In addition, it is readily understood that the processes can be executed synchronously or asynchronously, for example, in a plurality of modules.

[0154] Those skilled in the art can easily understand, through the above description of the embodiments, that the example embodiments described herein can be implemented by software, or by software in combination with necessary hardware. Therefore, the technical solutions according to the embodiments of the present disclosure can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a U disk, a mobile hard disk, etc.) or a network, and includes a number of instructions to enable a computing device (which can be a personal computer, a server, a touch terminal, or a network device, etc.) to perform the methods according to the embodiments of the present disclosure.

[0155] Other embodiments of the present disclosure will be apparent to those skilled in the art with the accomplishment of the present disclosure as set forth in the specification and practice of the invention disclosed herein. The present application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include known or customary practice in the art of the present disclosure not specifically disclosed. The specification and examples are to be regarded as illustrative only, and the true scope and spirit of the present disclosure are indicated by the claims.

[0156] It should be understood that the present disclosure is not limited to the precise structures described above and illustrated in the drawings and that various modifications and changes can be made without departing from the scope thereof. The scope of the present disclosure is limited only by the claims appended hereto.

Claims

1. An expiratory pressure calibration method for a ventilator, characterized by, The ventilator comprises an exhalation valve, a driving valve, and a pressure sensor arranged at an exhalation pressure measurement point, and the method comprises: acquiring a plurality of preset pressure control target values; controlling the driving valve to be opened and output a constant driving valve through gas flow to generate a gas pressure at the exhalation pressure measurement point by controlling the sealing valve degree of the exhalation valve; collecting a target gas pressure actual value at the exhalation pressure measurement point at the current time when the gas pressure is closed-loop controlled at each of the pressure control target values; acquiring a sensor detection value of the pressure sensor at the current time, constructing a correlation mapping relationship between the target gas pressure actual value and the sensor detection value, and taking the correlation mapping relationship as calibration data of the pressure sensor under each of the pressure control target values; the collecting of the target gas pressure actual value at the exhalation pressure measurement point at the current time when the gas pressure is closed-loop controlled at the pressure control target value comprises: recursively performing the following steps until the gas pressure obtained after adjusting the exhalation valve is equal to the pressure control target value, and taking the collected new current gas pressure actual value as the target gas pressure actual value at the exhalation pressure measurement point: sampling the gas pressure at the exhalation pressure measurement point by a standard gas pressure analyzer to obtain a current gas pressure actual value; if it is detected that the current gas pressure actual value is greater than or less than the pressure control target value, determining a pressure difference value between the current gas pressure actual value and the pressure control target value; controlling the sealing valve degree of the exhalation valve according to the pressure difference value to realize adjustment of the gas pressure at the exhalation pressure measurement point, and sampling the gas pressure at the exhalation pressure measurement point by the standard gas pressure analyzer to obtain a new current gas pressure actual value.

2. The exhalation pressure calibration method for a respirator according to claim 1, wherein, The exhalation pressure measurement point is arranged at the exhalation valve and a proximal side of an exhalation pipeline of the ventilator.

3. The exhalation pressure calibration method for a respirator according to claim 1, wherein, The controlling of the sealing valve degree of the exhalation valve according to the pressure difference value comprises: inputting the pressure difference value into a preset proportional-integral-derivative controller to determine a new control current corresponding to the exhalation valve; controlling the sealing valve degree of the exhalation valve by the new control current.

4. The exhalation pressure calibration method for a respirator according to claim 1, wherein, The method further comprises: if it is detected that the current gas pressure actual value is equal to the pressure control target value, not adjusting the control current of the exhalation valve, and taking the current gas pressure actual value as the target gas pressure actual value at the exhalation pressure measurement point.

5. The exhalation pressure calibration method for a respirator according to claim 1, wherein, The sampling of the gas pressure at the exhalation pressure measurement point by the standard gas pressure analyzer to obtain a current gas pressure actual value comprises: acquiring a preset sampling time length; sampling the gas pressure at the exhalation pressure measurement point within the sampling time length by the standard gas pressure analyzer to obtain an original gas pressure actual value; performing mean value filtering on the original gas pressure actual value to obtain the current gas pressure actual value.

6. The exhalation pressure calibration method for a respirator according to claim 5, wherein, The method further comprises: acquiring a preset pipeline gas leakage detection threshold value; If it is detected that the current gas pressure actual value is less than the pipeline leakage detection threshold, it is determined that the calibration fails, and error information is generated.

7. The exhalation pressure calibration method for a respirator according to claim 1, wherein, Before constructing the correlation mapping relationship between the target gas pressure actual value and the sensor detection value, and taking the correlation mapping relationship as the calibration data of the pressure sensor, the method further comprises: Determining the monotonicity between the target gas pressure actual value and the sensor detection value; If it is detected that the monotonicity of the target gas pressure actual value and the sensor detection value is non-monotonically increasing, it is determined that the calibration fails, and error information is generated.

8. A method for expiratory pressure detection for a breathing machine, characterized in that, The ventilator comprises a pressure sensor arranged at an exhalation pressure measurement point, and the method comprises: When a trigger instruction of outputting an exhalation pressure is detected, a sensor detection value of the gas pressure at the exhalation pressure measurement point is acquired by the pressure sensor; Calibration data is obtained according to the identification information of the pressure sensor, and the calibration data is obtained by the exhalation pressure calibration method for a ventilator according to any one of claims 1 to 7; In the calibration data, the gas pressure actual value corresponding to the sensor detection value is determined.

9. An expiratory pressure calibration device for a breathing machine for implementing the expiratory pressure calibration method for a breathing machine according to any one of claims 1 to 7, or implementing the expiratory pressure detection method for a breathing machine according to claim 8, characterized in that, The ventilator comprises an exhalation valve, a drive valve, and a pressure sensor arranged at an exhalation pressure measurement point, and the exhalation pressure calibration device for a ventilator comprises: A pressure target value acquisition module for acquiring a plurality of pre-set pressure control target values; A gas pressure generation module for controlling the drive valve to open and output a constant drive valve through gas flow to generate gas pressure at the exhalation pressure measurement point by controlling the valve closing degree of the exhalation valve; A pressure actual value acquisition module for acquiring a target gas pressure actual value at the exhalation pressure measurement point at the current time when the gas pressure is closed-loop controlled at the pressure control target value; A calibration data generation module for acquiring a sensor detection value of the pressure sensor at the current time, constructing a correlation mapping relationship between the target gas pressure actual value and the sensor detection value, and taking the correlation mapping relationship as the calibration data of the pressure sensor under each pressure control target value.

10. An electronic device comprising: a processor; and a memory having computer readable instructions stored thereon, the computer readable instructions, when executed by the processor, implement the exhalation pressure calibration method for a ventilator according to any one of claims 1 to 7, or implement the exhalation pressure detection method for a ventilator according to claim 8. ​

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