CN112704791A - CPAP (continuous positive airway pressure) mode air delivery control method of respiratory support equipment and respiratory support equipment - Google Patents
CPAP (continuous positive airway pressure) mode air delivery control method of respiratory support equipment and respiratory support equipment Download PDFInfo
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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
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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
- A61M2205/00—General characteristics of the apparatus
- A61M2205/33—Controlling, regulating or measuring
- A61M2205/3331—Pressure; Flow
- A61M2205/3341—Pressure; Flow stabilising pressure or flow to avoid excessive variation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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Abstract
The invention relates to a breathing support equipment CPAP mode air delivery control method and a breathing support equipment. A respiratory support device CPAP mode ventilation control method, comprising the steps of: setting a set pressure of the respiratory support apparatus; based on the set pressure, acquiring an optimal PID control parameter of the turbine under the corresponding set pressure from a PID parameter curve; and driving the turbine to output airflow at the set pressure in the CPAP mode based on the optimal PID control parameter. The invention provides a CPAP (continuous positive airway pressure) mode gas delivery control method of a respiratory support device, which is characterized in that a PID (proportion integration differentiation) parameter curve is set in the respiratory support device, when a PID control turbine works in the CPAP mode, the stability of the pressure of the output gas flow of the turbine can be ensured, and the pressure fluctuation limit of the output gas flow can be ensured to be 0.5cmH2O, is convenient and quick and has great progress.
Description
Technical Field
The invention relates to the field of respiratory support, in particular to a CPAP (continuous positive airway pressure) mode air delivery control method of a respiratory support device and the respiratory support device.
Background
In use of the non-invasive respiratory support apparatus, the CPAP (Continuous Positive Airway Pressure) mode is a very common mode that provides primarily constant Pressure output. When using the breathing support device, the user inhales and exhales, which causes a large fluctuation in the pressure of the breathing support device, and the user inhales, which causes a large drop in pressure and exhales, which causes a large rise in pressure. For the respiratory support device without valve, it is difficult to maintain the stable output of pressure in the continuous positive airway pressure CPAP mode, and in the prior art, the pressure of the respiratory support device is mainly adjusted by PID, that is, the power of the turbine is increased and decreased according to the set pressure, so that the pressure is stabilized to the set value. PID is as follows: abbreviations for proportionality, Integral, Differential. As the name suggests, the PID control algorithm is a control algorithm which combines three links of proportion, integral and differentiation into a whole, and is the control algorithm which is the most mature in technology and the most widely applied in a continuous system. The respiratory support equipment in the current market mostly adopts a PID control mode for controlling a turbine motor, the difference value of target pressure and current actual pressure is set as feedback quantity, operation is carried out according to the functional relation of proportion, integral and differential, and the operation result is used for controlling output. Most PID algorithms adopt fixed Kp, Ki and Kd for calculation, and for the control of a turbine motor in the respiratory support equipment, the scheme has larger fluctuation of the output of the turbine motor for different target pressures and different patients, and the pressure stability in the CPAP mode is influenced.
Patent document No. cn201710365650.x discloses a ventilator and a pressure control method in a Continuous Positive Airway Pressure (CPAP) mode, the ventilator including: the flow sensor, the pressure sensor, the processor, the memory and a control program stored on the memory and capable of running on the processor, the control program when executed by the processor realizes the following steps: when the breathing machine is in a CPAP mode, acquiring a flow curve and a pressure curve of the breathing machine, determining an inspiration starting moment P, and increasing the output power of a fan of the breathing machine at the inspiration starting moment P; respectively acquiring the change rates of flow and pressure based on the flow curve and the pressure curve, and intermittently increasing the output power of a fan of the breathing machine when the change rate of the flow is continuously greater than 0 and the change rate of the pressure is less than 0; and intermittently reducing the output power of a fan of the breathing machine in a state that the change rate of the pressure is greater than 0. The above problems still remain.
Thus, the gas delivery control field of the existing respiratory support apparatus is insufficient and needs to be improved and enhanced.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention provides a CPAP mode air delivery control method for a respiratory support device and a respiratory support device, which can ensure the stable performance of the respiratory support device when outputting the air flow with the set pressure and reduce the fluctuation of the output air flow.
In order to achieve the purpose, the invention adopts the following technical scheme:
a respiratory support device CPAP mode ventilation control method, comprising the steps of:
setting a set pressure of the respiratory support apparatus;
based on the set pressure, acquiring an optimal PID control parameter of the turbine under the corresponding set pressure from a PID parameter curve;
and driving the turbine to output airflow at the set pressure in the CPAP mode based on the optimal PID control parameter.
In the preferred method for controlling CPAP mode ventilation of a respiratory support device, the PID parameter curve is obtained by:
connecting a breathing simulation device to a gas transmission port of a breathing support device;
respectively recording optimal PID control parameters of the turbine under the condition of outputting air flows with different set pressures;
and performing data fitting to obtain the PID parameter curve.
In the preferred CPAP mode air delivery control method for the respiratory support apparatus, the respiratory simulation device is an active simulation lung.
Preferably, the ventilation control method in the CPAP mode of the respiratory support device drives the turbine based on the optimal PID control parameter, specifically, the turbine is driven by calculating a duty ratio and outputting a PWM wave through PID.
Preferably, in the CPAP mode air delivery control method for a respiratory support device, the calculation formula of the PWM wave is:
PWM(k)＝PWM(k-1)+△PWM；
△PWM＝Kp[e(k)-e(k-1)]+Ki*e(k)+Kd[e(k)-2e(k-1)+e(k-2)]；
wherein Kp represents a proportionality coefficient; ki represents an integral coefficient; kd represents a differential coefficient, preferably 0; e (k) represents the current deviation; e (k-1) represents the last offset; e (k-2) represents the deviation of the last two times; Δ PWM represents this increment; PWM (k) represents the output duty ratio; PWM (k-1) represents the last output duty cycle.
In the preferred CPAP mode air delivery control method for the respiratory support device, the PID control parameters include a proportional parameter, an integral parameter and a differential parameter; a PID parameter curve is constructed for each parameter, wherein the differential parameter is preferably 0.
A computer readable medium storing computer executable software which when executed by a computer is capable of performing the respiratory support apparatus CPAP mode air delivery control method.
A PID parameter detection system for the CPAP mode gas delivery control method of the respiratory support equipment, which is used for acquiring the PID parameter curve of the respiratory support equipment and comprises the respiratory support equipment and a respiratory simulation device; the air outlet of the respiratory support equipment is sleeved with a respiratory pipeline, the other end of the respiratory pipeline is inserted with a three-way joint, and the other two interfaces of the three-way joint are respectively connected with the respiratory simulation device and a plug; the plug is provided with an air leakage hole.
Preferably, in the PID parameter detection system, the breathing simulation device actively simulates lungs, and the basic parameters are set as: airway resistance 10cmH2O, lung compliance 50ml, respiratory rate 10BPM, length of inspiration 1.0S.
A respiratory support device controls the operation of a turbine using the respiratory support device CPAP mode air delivery control method.
Compared with the prior art, the CPAP mode air delivery control method and the respiratory support equipment provided by the invention have the following beneficial effects:
the invention provides a CPAP mode air delivery control method of a respiratory support device, which firstly sets a PID parameter curve at an expirationIn the suction support equipment, when the PID is used for controlling the turbine to work in the CPAP mode, the stability of the pressure of the output airflow of the turbine can be ensured, and the pressure fluctuation of the output airflow can be ensured to be limited to 0.5cmH2O, is convenient and quick and has great progress.
Drawings
FIG. 1 is a flow chart of a method for controlling CPAP mode delivery of a respiratory support apparatus provided by the present invention;
FIG. 2 is a set pressure setting of 6cm H for a respiratory support apparatus provided by the present invention2O, actively simulating a pressure oscillogram of the lung;
FIG. 3 is a graph of the fit results for the scale parameters provided by the present invention;
fig. 4 is a geometric result graph of the differential parameters provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It is to be understood by those skilled in the art that the foregoing general description and the following detailed description are exemplary and explanatory of specific embodiments of the invention, and are not intended to limit the invention.
The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process or method that comprises a list of steps does not include only those steps, but may include other steps not expressly listed or inherent to such process or method. Also, without further limitation, one or more devices or subsystems, elements or structures or components beginning with "comprise. The appearances of the phrases "in one embodiment," "in another embodiment," and similar language throughout this specification may, but do not necessarily, all refer to the same embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
Referring to fig. 1, the present invention provides a method for controlling CPAP mode air delivery of a respiratory support device, comprising the steps of:
setting a set pressure of the respiratory support apparatus;
based on the set pressure, acquiring an optimal PID control parameter of the turbine under the corresponding set pressure from a PID parameter curve; further, the PID parameter curve is built in a control module of the respiratory support apparatus or stored in a storage module, and of course, the PID parameter curve needs to be detected independently for a single respiratory support apparatus or a single production batch of respiratory support apparatuses. The specific detection method can use the detection method commonly used in the field, and also can use the PID parameter curve acquisition step provided by the invention.
And driving the turbine to output airflow at the set pressure in the CPAP mode based on the optimal PID control parameter. After the set pressure is obtained, the breathing support equipment obtains the optimal PID control parameter of the breathing support equipment aiming at the set pressure based on the PID curve, and then the PID control method commonly used in the field is used for carrying out gas transmission operation, so that the output gas flow fluctuation of the turbine motor is small, and discomfort can not be caused by large and small time. Through tests, the output fluctuation of the gas transmission pressure of the respiratory support equipment can be within +/-0.5 cm H2And O, the experience effect is excellent.
Preferably, in this embodiment, the turbine is driven based on the optimal PID control parameter, specifically, the turbine is driven by calculating a duty ratio and outputting a PWM wave through PID. The calculation formula of the PWM wave is as follows:
PWM(k)＝PWM(k-1)+△PWM；
△PWM＝Kp[e(k)-e(k-1)]+Ki*e(k)+Kd[e(k)-2e(k-1)+e(k-2)]；
wherein Kp represents a proportionality coefficient; ki represents an integral coefficient; kd represents a differential coefficient, preferably 0, i.e. the differential coefficient is not considered in the present embodiment, and the corresponding PID parameter curve is constantly 0; e (k) represents the current deviation; e (k-1) represents the last offset; e (k-2) represents the deviation of the last two times; Δ PWM represents this increment; PWM (k) represents the output duty ratio; PWM (k-1) represents the last output duty cycle.
Specifically, in the CPAP mode of the respiratory support apparatus, the rotation speed of the turbine motor is controlled with the set pressure as a target. The closed-loop control of the motor rotating speed is a process of measuring the rotating speed information of the motor according to the pulse number acquired in unit time, comparing the actual pressure output by the turbine at the rotating speed with a target value to obtain a control deviation, controlling the proportion, the integral and the differential of the deviation through a main control MCU (micro control unit), namely PID (proportion integration differentiation), outputting a PWM (pulse width modulation) wave through controlling a duty ratio, and controlling the rotating speed of the motor to enable the pressure deviation to tend to zero.
Preferably, in this embodiment, the PID parameter curve is obtained through the following steps:
connecting a breathing simulation device to a gas transmission port of a breathing support device;
respectively recording optimal PID control parameters of the turbine under the condition of outputting air flows with different set pressures;
and performing data fitting to obtain the PID parameter curve. The PID control parameters comprise a proportional parameter Kp, an integral parameter Ki and a differential parameter Kd; a PID parameter curve is constructed for each parameter, wherein the differential parameter is preferably 0.
Correspondingly, the invention also provides a PID parameter detection system for the CPAP mode gas delivery control method of the respiratory support equipment, which is used for acquiring the PID parameter curve of the respiratory support equipment and comprises the respiratory support equipment and a respiratory simulation device; the air outlet of the respiratory support equipment is sleeved with a respiratory pipeline, the other end of the respiratory pipeline is inserted with a three-way joint, and the other two interfaces of the three-way joint are respectively connected with the respiratory simulation device and a plug; the plug is provided with an air leakage hole. The breathing simulation device is used for actively simulating lungs, and basic parameters are set as follows: airway resistance 10cmH2O, lung compliance 50ml, respiratory rate 10BPM, length of inspiration 1.0S.
Specifically, a breathing simulation device for simulating external pressure is used to access a gas transmission port of the breathing support equipment and is used for simulating different external pressures, and the breathing simulation device is preferably an active simulated lung commonly used in the field; simulating different pressure outputs by using the respiration simulation device to simulate the respiration state of the animal; the air outlet of the respiratory support equipment is sleeved with a 1.8m long respiratory pipeline, the other end of the pipeline is connected with a three-way joint, and the other two interfaces of the three-way joint are respectively connected with the pressure simulation edge and a plug for fixing an air leakage hole. The plug has the main function of simulating negative air leakage holes. Under the condition that the breathing simulation device is an active simulation lung, the set parameters of the active simulation lung are preferably airway resistance 10cmH2O, lung compliance 50ml, breathing frequency 10BPM and inspiration time 1.0S. Are provided as reference only.
The respiratory support device is connected to the active simulated lung as described above and the simulated lung parameters are set. For the CPAP mode of the respiratory support device, the general set-up parameter is 4-20cmH2And O. Setting pressures of 4, 6 and 8, 20, respectively, and adjusting Kp and Ki until adjusting pressure fluctuation of the simulated lung in respiration conversion to +/-0.5 cm H2Within O. As shown in FIG. 2 below, this is a setting pressure of 6cm H for the respiratory support apparatus2O time actively simulates the pressure oscillogram of the lung, and the method provided by the invention can ensure that the pressure fluctuation is 0.5cm H2Within O, the body feeling is better.
The adjusted Kp and Ki at different set pressures were recorded separately as shown in the following table:
| set | Kp | Ki | |
| 4 | 75.4 | 6.31 | |
| 6 | 48.5 | 3.81 | |
| 8 | 29.1 | 2.33 | |
| 10 | 20.5 | 1.54 | |
| 12 | 18.7 | 1.44 | |
| 14 | 25.5 | 2.04 | |
| 16 | 41.7 | 3.35 | |
| 18 | 66.9 | 5.34 | |
| 20 | 101 | 8.11 |
And according to the obtained data, fitting the data to obtain a fitting curve and a corresponding formula as shown in fig. 3 and 4. The method specifically comprises the following steps: setting the pressure Tpress, the fitting formula of each of Kp and Ki is as follows:
Kp＝1.0889*Tpress2-24.569*Tpress+156.46；
Ki＝0.09*Tpress2-2.041*Tpress+12.937；
and then leading the fitted Kp and Ki formulas into a control module of the breathing support equipment, and calling the formulas during PID (proportion integration differentiation) regulation control, so that the output of the turbine motor can be accurately controlled to reach the set target pressure, the jitter of the turbine output pressure in a CPAP (continuous positive airway pressure) mode is effectively reduced, and a better somatosensory effect is achieved.
In summary, through the connection test of the respiratory support device and the respiratory simulation device, PID parameters of the fan turbine under different set pressures are monitored, optimal PID control parameters under different set pressures are found out, and the data are fitted, so that a linear formula in which basic parameters of the turbine correspond to optimal parameters under different set pressure states in order to obtain the set pressure can be obtained. And a control program of the respiratory support equipment is introduced, so that the output stability of the turbine motor is ensured when airflow with different set pressures is set. Further, it is ensured that the output of the turbine fluctuates at 0.5cm H2O when the respiratory support apparatus is in the CPAP mode.
The present invention also provides a computer readable medium storing computer executable software which, when executed by a computer, is capable of performing the respiratory support apparatus CPAP mode air delivery control method. The specific implementation principle is consistent with the foregoing content, and details are not repeated here. It should be noted that the computer readable medium may exist alone or may be attached to an electronic device as long as the control method described in its entirety when executed by a processor is implemented.
The invention also provides a respiratory support device, and the operation of the turbine is controlled by using the CPAP mode air delivery control method of the respiratory support device. The method comprises the steps of monitoring PID parameters of a fan turbine under different set pressures, finding out optimal PID control parameters under different set pressures, fitting data, obtaining a linear formula of optimal parameters under different set pressure states corresponding to basic parameters of the turbine for obtaining the set pressures, determining the basic set parameters of the turbine as long as the set pressures are determined every time when the respiratory support equipment is used, outputting the basic parameters of the turbine to the corresponding basic parameters in a sliding mode by using a PID control algorithm, and is convenient and fast. And a control program of the respiratory support equipment is introduced, so that the output stability of the turbine motor is ensured when airflow with different set pressures is set. Further, it is ensured that the output of the turbine fluctuates at 0.5cm H2O when the respiratory support apparatus is in the CPAP mode.
It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the scope of the appended claims.
Claims (10)
1. A method of ventilatory support CPAP mode ventilatory control comprising the steps of:
setting a set pressure of the respiratory support apparatus;
based on the set pressure, acquiring an optimal PID control parameter of the turbine under the corresponding set pressure from a PID parameter curve;
and driving the turbine to output airflow at the set pressure in the CPAP mode based on the optimal PID control parameter.
2. A respiratory support device CPAP mode air delivery control method as claimed in claim 1, wherein the PID parameter curve is obtained by:
connecting a breathing simulation device to a gas transmission port of a breathing support device;
respectively recording optimal PID control parameters of the turbine under the condition of outputting air flows with different set pressures;
and performing data fitting to obtain the PID parameter curve.
3. A respiratory support apparatus CPAP mode infusion control method according to claim 2, wherein the breathing simulation device is an actively simulated lung.
4. A respiratory support device (CPAP) mode air delivery control method according to claim 1, wherein a turbine is driven based on the optimal PID control parameters, in particular by PID calculating duty cycle output PWM wave.
5. A respiratory support device (CPAP) mode air delivery control method according to claim 4, wherein the PWM wave is calculated as:
PWM(k)＝PWM(k-1)+△PWM；
△PWM＝Kp[e(k)-e(k-1)]+Ki*e(k)+Kd[e(k)-2e(k-1)+e(k-2)]；
wherein Kp represents a proportionality coefficient; ki represents an integral coefficient; kd represents a differential coefficient, preferably 0; e (k) represents the current deviation; e (k-1) represents the last offset; e (k-2) represents the deviation of the last two times; Δ PWM represents this increment; PWM (k) represents the output duty ratio; PWM (k-1) represents the last output duty cycle.
6. A respiratory support device CPAP mode air delivery control method as claimed in claim 1 wherein PID control parameters include proportional, integral and derivative parameters; a PID parameter curve is constructed for each parameter, wherein the differential parameter is preferably 0.
7. A computer readable medium storing computer executable software which when executed by a computer is capable of performing a method of CPAP mode ventilation control of a respiratory support device as claimed in any one of claims 1-6.
8. A PID parameter detection system for use in a method of CPAP mode gas delivery control of a respiratory support device as claimed in claim 2, for obtaining the PID parameter profile of a respiratory support device, comprising a respiratory support device and a respiratory simulation means; the air outlet of the respiratory support equipment is sleeved with a respiratory pipeline, the other end of the respiratory pipeline is inserted with a three-way joint, and the other two interfaces of the three-way joint are respectively connected with the respiratory simulation device and a plug; the plug is provided with an air leakage hole.
9. The PID parameter detection system of claim 8, wherein the breathing simulation device is an active simulated lung, and the base parameters are set to: airway resistance 10cmH2O, lung compliance 50ml, respiratory rate 10BPM, length of inspiration 1.0S.
10. A respiratory support apparatus, characterized in that the operation of a turbine is controlled using the method of CPAP mode air delivery control of a respiratory support apparatus as claimed in any one of claims 1-6.
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| PCT/CN2021/117964 WO2022142470A1 (en) | 2020-12-29 | 2021-09-13 | Air transmission control method under continuous positive airway pressure (cpap) mode for respiratory support device, and respiratory support device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022142470A1 (en) * | 2020-12-29 | 2022-07-07 | 湖南明康中锦医疗科技发展有限公司 | Air transmission control method under continuous positive airway pressure (cpap) mode for respiratory support device, and respiratory support device |
| CN115465838A (en) * | 2022-09-14 | 2022-12-13 | 深圳市东吉联医疗科技有限公司 | Oxygen generation system capable of self-adapting to rotating speed of compressor |
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| WO2022142470A1 (en) | 2022-07-07 |
| CN112704791B (en) | 2023-08-22 |
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