CN112843408A - Volume ventilation control method and system of turbine ventilator - Google Patents
Volume ventilation control method and system of turbine ventilator Download PDFInfo
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- CN112843408A CN112843408A CN202011630604.6A CN202011630604A CN112843408A CN 112843408 A CN112843408 A CN 112843408A CN 202011630604 A CN202011630604 A CN 202011630604A CN 112843408 A CN112843408 A CN 112843408A
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- 238000009423 ventilation Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 27
- 210000004072 lung Anatomy 0.000 claims abstract description 11
- 230000003434 inspiratory effect Effects 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 2
- 230000029058 respiratory gaseous exchange Effects 0.000 abstract description 2
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
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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
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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
-
- 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
- A61M2016/003—Accessories therefor, e.g. sensors, vibrators, negative pressure with a flowmeter
-
- 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
- A61M2205/07—General characteristics of the apparatus having air pumping means
-
- 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
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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
- A61M2205/3334—Measuring or controlling the flow rate
Abstract
The invention discloses a volume ventilation control method and a system of a turbine respirator, wherein the method comprises the following steps: step 1) calculating to obtain a target flow rate according to a target tidal volume and total inspiration time, and calculating to obtain a target pressure according to airway resistance and lung compliance values and by combining the target flow rate; step 2) calculating the output pressure value of the turbine in real time according to the target pressure within the total air suction time, and calculating by combining the target flow rate to obtain the rotating speed of the turbine; and 3) carrying out proportional differential integral control according to the deviation value of the real-time monitored flow velocity value and the target flow velocity, and adjusting the rotating speed of the turbine by adjusting the driving voltage of the turbine so as to keep constant flow velocity. The ventilation control method provided by the invention effectively improves the method that the flow rate is regulated by a proportional valve in the prior art, simplifies the structure of the gas path, improves the ventilation performance and the control precision of the turbine, and achieves good effect by using the turbine to control ventilation accurately and reliably through actual ventilation on a breathing machine.
Description
Technical Field
The invention relates to the technical field of respirators, in particular to a volume ventilation control method and system of a turbine respirator.
Background
The turbine ventilator is a common device in hospitals, the turbine ventilator is an electric control type driving mode with a turbine as a driving air source, the turbine generates air flow at a certain rotating speed after being electrified, the rotating speed determines the air flow speed and pressure, VCV (Volume controlled ventilation) control ventilation needs to adjust the rotating speed of the turbine in real time, constant flow speed is kept in the inspiration process, and the purpose of accurately controlling the target tidal Volume is achieved.
Currently, the method of the turbine ventilator is to provide a certain rotation speed by a turbine, and then adjust the flow rate output by the turbine by a proportional valve to achieve the control of ventilation flow rate and pressure. This method needs turbine and proportional valve cooperation to adjust the ventilation, and the gas circuit structure is more loaded down with trivial details, consequently needs to carry out technological improvement.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a volume ventilation control method and system of a turbine respirator.
In order to achieve the above object, the present invention provides a volume ventilation control method for a turbo-ventilator, the method comprising:
step 1) calculating to obtain a target flow rate according to a target tidal volume and total inspiration time, and calculating to obtain a target pressure according to airway resistance and lung compliance values and by combining the target flow rate;
step 2) calculating the output pressure value of the turbine in real time according to the target pressure within the total air suction time, and calculating by combining the target flow rate to obtain the rotating speed of the turbine;
and 3) carrying out proportional differential integral control according to the deviation value of the real-time monitored flow velocity value and the target flow velocity, and adjusting the rotating speed of the turbine by adjusting the driving voltage of the turbine so as to keep constant flow velocity.
As an improvement of the above method, the step 1) is specifically:
calculating a target flow rate Qt according to the target tidal volume SetVt and the total inspiration time Tinsp as:
Qt＝SetVt/Tinsp；
according to the airway resistance R and the lung compliance value C and in combination with the target flow rate Qt, calculating to obtain a target pressure Pt as follows:
Pt＝R*Qt+SetVt/C。
as an improvement of the above method, the step 2) is specifically:
calculating the turbine output pressure value Pi at each moment in real time according to the target pressure Pt in the total inspiration time as follows:
Pi＝VentT/Tinsp*Pt
wherein VentT is the elapsed inspiratory time;
calculating the turbine speed N at each moment by the turbine output pressure value Pi and the target flow rate Qt as follows:
N＝a0+a1*Pi+a2*Qt+a3*Pi*Pi+a4*Pi*Qt+a5*Qt*Qt
wherein a0, a1, a2, a3, a4 and a5 are coefficients of the turbine calibration.
A volume ventilation control system for a turbine ventilator, the system comprising: the system comprises a target pressure output module, a turbine rotating speed output module and a turbine rotating speed adjusting module; wherein the content of the first and second substances,
the target pressure output module is used for calculating a target flow rate according to the target tidal volume and the total inspiration time, and calculating a target pressure according to the airway resistance and the lung compliance value and in combination with the target flow rate;
the turbine rotating speed output module is used for calculating a turbine output pressure value in real time according to the target pressure in the total air suction time and calculating by combining the target flow speed to obtain the turbine rotating speed;
and the turbine rotating speed adjusting module is used for carrying out proportional differential integral control according to the deviation value of the real-time monitored flow speed value and the target flow speed, and further adjusting the rotating speed of the turbine by adjusting the driving voltage of the turbine so as to keep constant flow speed.
As an improvement of the above system, the specific implementation process of the target pressure output module is as follows:
calculating a target flow rate Qt according to the target tidal volume SetVt and the total inspiration time Tinsp as:
Qt＝SetVt/Tinsp；
according to the airway resistance R and the lung compliance value C and in combination with the target flow rate Qt, calculating to obtain a target pressure Pt as follows:
Pt＝R*Qt+SetVt/C。
as an improvement of the system, the specific implementation process of the turbine speed output module is as follows:
calculating the turbine output pressure value Pi at each moment in real time according to the target pressure Pt in the total inspiration time as follows:
Pi＝VentT/Tinsp*Pt
wherein VentT is the elapsed inspiratory time;
calculating the turbine speed N at each moment by the turbine output pressure value Pi and the target flow rate Qt as follows:
N＝a0+a1*Pi+a2*Qt+a3*Pi*Pi+a4*Pi*Qt+a5*Qt*Qt
wherein a0, a1, a2, a3, a4 and a5 are coefficients of the turbine calibration.
Compared with the prior art, the invention has the advantages that:
the ventilation control method provided by the invention effectively improves the method that the flow rate is regulated by a proportional valve in the prior art, simplifies the structure of the gas path, improves the ventilation performance and the control precision of the turbine, and achieves good effect by using the turbine to control ventilation accurately and reliably through actual ventilation on a breathing machine.
Drawings
Fig. 1 is a flowchart of a volume ventilation control method of a turbo ventilator according to embodiment 1 of the present invention;
fig. 2 is a block diagram showing the components of a volume ventilation control system of a turbo ventilator according to embodiment 2 of the present invention.
Reference numerals
100. Target pressure output module 200 and turbine speed output module
300. Turbine speed regulating module
Detailed Description
The basic principle of the invention is to adjust the rotating speed of the turbine in real time according to the target flow rate, and combine the pressure rising curve to enable the turbine to output stable constant flow rate in the inspiration time, thereby achieving the target of capacity control constant flow rate.
The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and examples.
Example 1
As shown in fig. 1, embodiment 1 of the present invention provides a volume ventilation control method for a turbo-ventilator, which includes the following specific steps:
step 1) is a stage of calculating a tidal volume target flow rate and a target pressure. First, the target flow rate is calculated from tidal volume and inspiratory time:
Qt＝SetVt/Tinsp；
where Qt is the target flow rate, SetVt is the target tidal volume, and Tinsp is the inspiratory time.
Calculating the target pressure according to the air resistance and the compliance value:
Pt＝R*Qt+SetVt/C；
where Pt is the target pressure, R is the airway resistance, and C is the lung compliance.
Step 2) calculating the turbine output pressure value at each moment in real time according to the target pressure in the air suction process:
Pi＝VentT/Tinsp*Pt；
where VentT is the elapsed inspiratory time and Tinsp is the total inspiratory time.
Calculating the turbine speed at each moment from the Pi and Qt values:
N＝a0+a1*Pi+a2*Qt+a3*Pi*Pi+a4*Pi*Qt+a5*Qt*Qt，
wherein, N is the turbine speed, Pi is the real-time airway pressure, Qt is the flow rate, and a0, a1, a2, a3, a4 and a5 are coefficients determined by the data of the turbine calibration.
Step 3) is a real-time adjusting stage;
the driving voltage of the turbine is determined by the turbine speed N, and then the driving voltage of the turbine is gradually increased to enable the turbine speed to rise from low to high. PID (Proportional-Derivative-Integral-Control) regulation is carried out according to the deviation value of the flow rate value Q and the target flow rate Qt monitored in real time, namely the rotation speed of the turbine can be regulated in real time, and the aim of outputting constant flow rate is achieved;
example 2
As shown in fig. 2, embodiment 2 of the present invention proposes a volume ventilation control system of a turbo-ventilator. The system comprises: a target pressure output module 100, a turbine speed output module 200, and a turbine speed adjustment module 300; the specific implementation method is the same as that of example 1. Wherein the content of the first and second substances,
the target pressure output module 100 is configured to calculate a target flow rate according to a target tidal volume and a total inspiration time, and calculate a target pressure according to an airway resistance and a lung compliance value in combination with the target flow rate;
the turbine rotating speed output module 200 is used for calculating a turbine output pressure value in real time according to the target pressure within the total air suction time and calculating to obtain the turbine rotating speed by combining the target flow speed;
the turbine speed adjusting module 300 is configured to perform proportional-derivative-integral control according to the deviation value between the real-time monitored flow rate value and the target flow rate, and adjust the turbine speed by adjusting the driving voltage of the turbine, so as to maintain a constant flow rate.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (6)
1. A method of volume ventilation control for a turbo-ventilator, the method comprising:
step 1) calculating to obtain a target flow rate according to a target tidal volume and total inspiration time, and calculating to obtain a target pressure according to airway resistance and lung compliance values and by combining the target flow rate;
step 2) calculating the output pressure value of the turbine in real time according to the target pressure within the total air suction time, and calculating by combining the target flow rate to obtain the rotating speed of the turbine;
and 3) carrying out proportional differential integral control according to the deviation value of the real-time monitored flow velocity value and the target flow velocity, and adjusting the rotating speed of the turbine by adjusting the driving voltage of the turbine so as to keep constant flow velocity.
2. The volume ventilation control method of a turbo-ventilator according to claim 1, wherein the step 1) is specifically:
calculating a target flow rate Qt according to the target tidal volume SetVt and the total inspiration time Tinsp as:
Qt＝SetVt/Tinsp；
according to the airway resistance R and the lung compliance value C and in combination with the target flow rate Qt, calculating to obtain a target pressure Pt as follows:
Pt＝R*Qt+SetVt/C。
3. the volume ventilation control method of a turbo-ventilator according to claim 1, wherein the step 2) is specifically:
calculating the turbine output pressure value Pi at each moment in real time according to the target pressure Pt in the total inspiration time as follows:
Pi＝VentT/Tinsp*Pt
wherein VentT is the elapsed inspiratory time;
calculating the turbine speed N at each moment by the turbine output pressure value Pi and the target flow rate Qt as follows:
N＝a0+a1*Pi+a2*Qt+a3*Pi*Pi+a4*Pi*Qt+a5*Qt*Qt
wherein a0, a1, a2, a3, a4 and a5 are coefficients of the turbine calibration.
4. A volume ventilation control system for a turbo-ventilator, the system comprising: the system comprises a target pressure output module, a turbine rotating speed output module and a turbine rotating speed adjusting module; wherein the content of the first and second substances,
the target pressure output module is used for calculating a target flow rate according to the target tidal volume and the total inspiration time, and calculating a target pressure according to the airway resistance and the lung compliance value and in combination with the target flow rate;
the turbine rotating speed output module is used for calculating a turbine output pressure value in real time according to the target pressure in the total air suction time and calculating by combining the target flow speed to obtain the turbine rotating speed;
and the turbine rotating speed adjusting module is used for carrying out proportional differential integral control according to the deviation value of the real-time monitored flow speed value and the target flow speed, and further adjusting the rotating speed of the turbine by adjusting the driving voltage of the turbine so as to keep constant flow speed.
5. The volume ventilation control system of a turbo-ventilator of claim 4, wherein the target pressure output module is embodied by:
calculating a target flow rate Qt according to the target tidal volume SetVt and the total inspiration time Tinsp as:
Qt＝SetVt/Tinsp；
according to the airway resistance R and the lung compliance value C and in combination with the target flow rate Qt, calculating to obtain a target pressure Pt as follows:
Pt＝R*Qt+SetVt/C。
6. the volume ventilation control system of a turbo-ventilator according to claim 4, wherein the turbo speed output module is implemented by:
calculating the turbine output pressure value Pi at each moment in real time according to the target pressure Pt in the total inspiration time as follows:
Pi＝VentT/Tinsp*Pt
wherein VentT is the elapsed inspiratory time;
calculating the turbine speed N at each moment by the turbine output pressure value Pi and the target flow rate Qt as follows:
N＝a0+a1*Pi+a2*Qt+a3*Pi*Pi+a4*Pi*Qt+a5*Qt*Qt
wherein a0, a1, a2, a3, a4 and a5 are coefficients of the turbine calibration.
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| CN202011630604.6A CN112843408A (en) | 2020-12-31 | 2020-12-31 | Volume ventilation control method and system of turbine ventilator |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113425961A (en) * | 2021-08-26 | 2021-09-24 | 深圳市安保科技有限公司 | Control method and control device of turbine motor and breathing machine |
| CN114082058A (en) * | 2021-12-21 | 2022-02-25 | 河北谊安奥美医疗设备有限公司 | Functional safety control device and control method for breathing machine |
| CN114209938A (en) * | 2021-11-23 | 2022-03-22 | 北京谊安医疗系统股份有限公司 | Pressure control method and control system for breathing machine |
| CN114235302A (en) * | 2021-11-16 | 2022-03-25 | 北京谊安医疗系统股份有限公司 | Method for detecting leakage amount of ventilation loop |
| CN114377258A (en) * | 2021-12-21 | 2022-04-22 | 北京谊安医疗系统股份有限公司 | Control device and control method for basic flow of neonatal ventilator |
| CN114917438A (en) * | 2022-05-17 | 2022-08-19 | 山东大学 | Breathing machine working method based on flow rate control and breathing machine |
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| CN113425961A (en) * | 2021-08-26 | 2021-09-24 | 深圳市安保科技有限公司 | Control method and control device of turbine motor and breathing machine |
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| CN114377258B (en) * | 2021-12-21 | 2023-09-19 | 北京谊安医疗系统股份有限公司 | Control device and control method for basic flow of neonate breathing machine |
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| CN114917438A (en) * | 2022-05-17 | 2022-08-19 | 山东大学 | Breathing machine working method based on flow rate control and breathing machine |
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