CN105879168A - Anaesthesia machine pressure control method for achieving dual control through inspiratory phase and expiratory phase - Google Patents
Anaesthesia machine pressure control method for achieving dual control through inspiratory phase and expiratory phase Download PDFInfo
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- CN105879168A CN105879168A CN201410785284.XA CN201410785284A CN105879168A CN 105879168 A CN105879168 A CN 105879168A CN 201410785284 A CN201410785284 A CN 201410785284A CN 105879168 A CN105879168 A CN 105879168A
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Abstract
The invention relates to an anaesthesia machine pressure control method for achieving dual control through an inspiratory phase and an expiratory phase. Under a pressure control mode, a traditional flow and pressure cooperative fuzzy method is adopted for carrying out flow speed estimation fuzzy control on the pressure of an inhalation valve; a pressure sensor is utilized for monitoring the changing situation of the pressure inside a system and transmitting the changing situation of the pressure inside the system to an exhalation valve control unit, and the exhalation valve control deviation is worked out; in the inhalation process of an exhalation valve, the pressure sensor is utilized for carrying out PID control on inhalation set pressure; in the exhalation process, PID control is carried out on positive end-expiratory pressure; exhalation valve PID control parameters are graded, the grading range is 1-80 cm H2O, grading is carried out according to needed concerns, a curve-fitting method or a folded line approximation method is used for carrying out fitting on PID control parameters under pressure in the concerns after grading, and the inhalation valve and the exhalation valve are controlled at the same time in the control process.
Description
Technical field
The present invention relates to a kind of for realizing the high-performance of anesthetic machine and respirator, high-precision pressure control ventilating mode, belong to doctor
Treat equipment manufacturing technology field.
Background technology
Need some especial patient is carried out pressure controlled ventilation in anesthetic machine and respirator control.The Stress control known at present
Method has three kinds:
Using pressure PID to control directly patient to be carried out Stress control, this kind of method advantage is, algorithm realizes simple, makes
Most special pathological changes patient is can be used for the PID Stress control realized in the case of high-performance processor.Shortcoming is, for
Himself R, C value of the patient of different lesions is different, utilizes traditional pressure controling mode simple according to the pressure pair monitored
Whole system is controlled the pressure change cannot being well adapted under various R, C, hypoventilation or over control easily occurs,
Patient is produced serious harm, and to realize high performance control, be suitable for more R, C value patient, need to use high property
The processor of energy carries out real-time control process, and hardware cost is high.
Utilize fuzzy control technology, use pressure transducer to carry out the direct PID of pressure and control.Advantage is, for different lesions
Himself R, C value of patient different, utilize Pressure Fuzzy control mode can well solve due to the change of patient's R, C value
Change the impact on whole pid control parameter.Shortcoming is, in the design process the domain gear in fuzzy control rule and be subordinate to letter
The how many impact on control algolithm of membership of number is bigger, and gear and the overstocked control algolithm of membership calculate overlong time,
The DSP that needs are expensive can quickly realize, and gear and membership are the thinnest, and rule including degree is inadequate, has some R, C
Controlling value under value does not covers, and causes occurring in venting process over control, especially in particular cases there will be extremely individually
Reforming phenomena, can increase the weight of the ventilation burden of patient in the case of these special R, C values, cause complication.
The velocity pressure utilizing fuzzy control technology and classical formulas to be implemented in combination with controls, and the method advantage is, solves above two
The deficiency that the method for kind exists so that adaptation population is wider, and safety and reliability is higher.
But from the point of view of comfort level angle, three of the above method has a defect, after gas supply flow drops to 0LPM, due to
Patient or system external interference and the pressure that introduces raises, in the case of this by simply open outlet valve cannot at short notice by
Pressure re-establishes setting pressure so that patient comfort is had a greatly reduced quality.
Summary of the invention
Answered by the external world after in Stress control, gas feed flow rate drops to 0LPM because of anesthetic machine and respirator to be able to solve
Pressure raises problem, and the present invention provides a kind of anesthetic machine compress control method by inspiratory phase and expiratory phase two ore control, in order to
The pressure caused after solving to make zero because of coutroi velocity raises problem.
Technical scheme is as follows:
By the anesthetic machine compress control method of inspiratory phase and expiratory phase two ore control, it is characterised in that comprise the steps:
Step 1. in the pressure control mode, uses traditional flow pressure to work in coordination with fuzzy control method, the pressure to inlet valve
Carry out flow velocity estimation fuzzy control；
Step 2. utilizes pressure alteration situation in pressure sensor monitoring system, passes to pressure changing in system exhale
Valve control unit, VCU, calculates outlet valve control deviation；
Step 3. outlet valve utilizes pressure transducer that air-breathing setting pressure is carried out PID control in breathing process, is exhaling
Journey carries out PID control to end expiratory positive pressure；
Step 4. is outlet valve pid control parameter stepping, and stepping scope is at 1cmH2O～80cmH2According to required concern in O
Point stepping, intends the pid control parameter under each pressure in focus with curve-fitting method or piecewise approximation after stepping
With；
Step 5. is by finely tuning pid control parameter and the Kalman feedback estimation coefficient of inlet valve, and finely tunes the PID of outlet valve
Control parameter and Kalman feedback estimation coefficient, the relation of two valves self is adjusted to an optimum state, was controlling
Air-breathing and two valves of exhaling are controlled by journey simultaneously.
In said method, air-breathing controls to use the identical feedback control time with expiration control algolithm.
In said method, limit parameter realize under air-breathing and expiration state not by adding bias current in outlet valve PID control unit
Bias current regulation in the case of Tong.
In said method, the feedback control cycle that described PID controls is any one fixed value in 1～10ms.
The present invention utilizes inspiration flow control valve and outlet valve Collaborative Control, carries out inspiratory phase pressure and expiratory phase according to setting pressure
Pressure dual controls, and solves because anesthetic machine and respirator are answered by the external world after in Stress control, gas feed flow rate drops to 0LPM
The pressure rising problem risen, and it is slow incidentally to solve end expiratory positive pressure foundation in traditional algorithm, and air-breathing, when expiration conversion, is pressed
Power drops to the slow-footed problem of end expiratory positive pressure from setting pressure, improves patient comfort.
Accompanying drawing explanation
Fig. 1 be the present invention realize procedural block diagram.
Detailed description of the invention
Shown in Fig. 1, the inlet valve of the present invention and the anesthetic machine of outlet valve Collaborative Control, respirator compress control method include:
Inlet valve works in coordination with fuzzy control method according to traditional flow pressure, utilizes the fuzzy controller pressure to inlet valve
Carry out flow-control；
Utilize pressure PID to control the pressure of outlet valve and carry out Stress control；
Coordinate the relation between two valves, by pid control parameter and the Kalman feedback estimation coefficient of fine setting inlet valve,
And finely tune pid control parameter and the Kalman feedback estimation coefficient of outlet valve, the relation of two valves self is adjusted to one
Optimum state.
During controlling, air-breathing and two valves of exhaling are controlled simultaneously.According to air-breathing, expiratory flow sensor, pressure sensing
Rapport between device and two valves, carries out pressure feedback control.Such as: in inspiratory phase, traditional flow pressure works in coordination with mould
Fuzzy control method calculates that inlet valve is required controls flow, control valve to reach to control flow, outlet valve according to set pressure by
Gradually close valve, until valve output flow reaches to limit flow, with crossing continuous feedback control, both input and output are reached
Become a kind of correlated state, just can realize pressure of inspiration(Pi) control.
The specific implementation of the present invention is as follows:
Step 1. in the pressure control mode, uses traditional flow pressure to work in coordination with fuzzy control method, the pressure to inlet valve
Carry out flow velocity estimation fuzzy control；
Step 2. utilizes pressure alteration situation in pressure sensor monitoring system, passes to pressure changing in system exhale
Valve control unit, VCU, calculates outlet valve control deviation；
Step 3. outlet valve utilizes pressure transducer that air-breathing setting pressure is carried out PID control in breathing process, is exhaling
Journey carries out PID control to end expiratory positive pressure；
Step 4. is outlet valve pid control parameter stepping, and stepping scope is at 1cmH2O～80cmH2According to required concern in O
Point stepping, intends the pid control parameter under each pressure in focus with curve-fitting method or piecewise approximation after stepping
With；
Step 5. is by finely tuning pid control parameter and the Kalman feedback estimation coefficient of inlet valve, and finely tunes the PID of outlet valve
Control parameter and Kalman feedback estimation coefficient, the relation of two valves self is adjusted to an optimum state, was controlling
Air-breathing and two valves of exhaling are controlled by journey simultaneously.
The air-breathing of the present invention controls to use the identical feedback control time with expiration control algolithm, controls under the identical feedback control time
Best results.
The present invention realizes different situations under air-breathing and expiration state by adding bias current restriction parameter in outlet valve PID control unit
Lower bias current regulates, and the work of this part can promote patient comfort, is limited by this bias current, can trigger under control model,
Promote patient's trigger sensitivity so that patient is autonomous, and air-breathing is more smooth and easy.
The feedback control cycle that the PID of the present invention controls is any one fixed value in 1～10ms, at this moment between in the range of control
Best results, depending on the setting of the feedback time characteristic according to selected microprocessor, the feedback cycle time is the shortest, patient comfort
The highest, also can realize this air-breathing outlet valve Collaborative Control algorithm more than the feedback control cycle in the case of 10ms, but patient comfort
Degree is not especially desirable.
Claims (4)
1. by inspiratory phase and the anesthetic machine compress control method of expiratory phase two ore control, it is characterised in that comprise the steps:
Step 1. in the pressure control mode, uses traditional flow pressure to work in coordination with fuzzy control method, the pressure to inlet valve
Carry out flow velocity estimation fuzzy control；
Step 2. utilizes pressure alteration situation in pressure sensor monitoring system, passes to pressure changing in system exhale
Valve control unit, VCU, calculates outlet valve control deviation；
Step 3. outlet valve utilizes pressure transducer that air-breathing setting pressure is carried out PID control in breathing process, is exhaling
Journey carries out PID control to end expiratory positive pressure；
Step 4. is outlet valve pid control parameter stepping, and stepping scope is at 1cmH2O～80cmH2According to required concern in O
Point stepping, intends the pid control parameter under each pressure in focus with curve-fitting method or piecewise approximation after stepping
With；
Step 5. is by finely tuning pid control parameter and the Kalman feedback estimation coefficient of inlet valve, and finely tunes the PID of outlet valve
Control parameter and Kalman feedback estimation coefficient, the relation of two valves self is adjusted to an optimum state, was controlling
Air-breathing and two valves of exhaling are controlled by journey simultaneously.
Anesthetic machine compress control method by inspiratory phase and expiratory phase two ore control the most according to claim 1, it is special
Levy and be: air-breathing controls to use the identical feedback control time with expiration control algolithm.
Anesthetic machine compress control method by inspiratory phase and expiratory phase two ore control the most according to claim 1, it is special
Levy and be: limit parameter realize under air-breathing and expiration state under different situations partially by adding bias current in outlet valve PID control unit
Stream regulation.
Anesthetic machine compress control method by inspiratory phase and expiratory phase two ore control the most according to claim 1, it is special
Levy and be: the feedback control cycle that described PID controls is any one fixed value in 1～10ms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410785284.XA CN105879168A (en) | 2014-12-16 | 2014-12-16 | Anaesthesia machine pressure control method for achieving dual control through inspiratory phase and expiratory phase |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410785284.XA CN105879168A (en) | 2014-12-16 | 2014-12-16 | Anaesthesia machine pressure control method for achieving dual control through inspiratory phase and expiratory phase |
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| CN105879168A true CN105879168A (en) | 2016-08-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112704791A (en) * | 2020-12-29 | 2021-04-27 | 湖南明康中锦医疗科技发展有限公司 | CPAP (continuous positive airway pressure) mode air delivery control method of respiratory support equipment and respiratory support equipment |
-
2014
- 2014-12-16 CN CN201410785284.XA patent/CN105879168A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112704791A (en) * | 2020-12-29 | 2021-04-27 | 湖南明康中锦医疗科技发展有限公司 | CPAP (continuous positive airway pressure) mode air delivery control method of respiratory support equipment and respiratory support equipment |
| 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 |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160824 |
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| WD01 | Invention patent application deemed withdrawn after publication |