CN102397610B - Method for adjusting gradient of slope under anesthesia machine and breathing machine pressure control - Google Patents
Method for adjusting gradient of slope under anesthesia machine and breathing machine pressure control Download PDFInfo
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- CN102397610B CN102397610B CN201010275580.7A CN201010275580A CN102397610B CN 102397610 B CN102397610 B CN 102397610B CN 201010275580 A CN201010275580 A CN 201010275580A CN 102397610 B CN102397610 B CN 102397610B
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Abstract
The invention discloses a method for adjusting gradient of a slope under anesthesia machine and breathing machine pressure control, which comprises the following steps of: (1) estimating the air resistance (R) value and the compliance (C) value of a patient by an R and C quick estimation technology in a control starting state; (2) in the suction starting process, calculating an average flow rate F in suction ascent time according to a formula F=Delta P/(E*Tramp+R); (3) setting an upper limit control flow rate in the time which is less than set suction time as F in a suction valve and expiration valve cooperative adjustment system; (4) regularly measuring the actual flow of a feedback valve output flow rate in the suction ascent time, and slowly increasing the valve output flow rate to the upper limit control flow rate F when the suction ascent time is in the set time and the valve output flow rate is less than the upper limit control flow rate F; and (5) eliminating control limit from the upper limit flow rate of the suction valve and expiration valve cooperative adjustment system and switching to suction valve and expiration valve cooperative pressure adjustment after the suction ascent time surpasses set ascent time.
Description
Technical field
The invention provides a kind of method for solving Anesthesia machine and the control of lung ventilator Stress control downslope slope adjustment newly, regulating Inspiratory rise time to regulate slope slope according to Preset Time, accurate pressure ramp can be realized and control.The invention belongs to Medical Devices manufacturing technology field.
Background technology
In Anesthesia machine and lung ventilator control, when using suction control valve and exhalation control valve collaborative work, because Inspiratory rise time is fixed, be difficult to the adjustment effectively realizing Inspiratory rise time.
At present, Anesthesia machine and lung ventilator regulate the mode of Inspiratory rise time mainly contain two kinds:
1, utilize frame for movement to regulate gas feed flow rate, realize Inspiratory rise time and regulate.The advantage of this method is, controlling organization is simple, can be easy to realize pressure slope and control.Shortcoming is, the method mechanical part degree of regulation is poor, well can not ensure the precision of rise time;
2, control algolithm is utilized to adjust flow-control threshold velocity, to ensure that Inspiratory rise time regulates.The advantage of this method is, utilize valve-gating technology to be realized by the method for software, hardware cost is low.Shortcoming is, this kind of method requires the FEEDBACK CONTROL cycle quickly, and common microprocessor cannot well complete, and easily occur that pressure of inspiration(Pi) overshoot is excessive, cause wind-contusion, and Inspiratory rise time control accuracy is not high, pins down by FEEDBACK CONTROL.
Summary of the invention
The object of the invention is to the problem for causing the software adjustment rise time not good in prior art because hardware resource is limited, a kind of Anesthesia machine, lung ventilator Stress control downslope slope adjustment method are proposed, utilize estimation R, C value to calculate flow needed for Inspiratory rise time and ensure the precision of Inspiratory rise time, eliminate the overshoot phenomenon occurred when pressure of inspiration(Pi) regulates.
Technical scheme of the present invention is as follows:
Anesthesia machine, lung ventilator Stress control downslope slope adjustment method, for Stress control when Anesthesia machine and lung ventilator suction control valve and exhalation control valve collaborative work, is characterized in that:
(1), in control initial state, when correctly not monitoring patient R, C value, according to 50% carrying out a test property ventilation of setting pressure, R, C fast estimation technique is utilized to estimate R, C value of patient during this period;
(2) in air-breathing initial period, according to formula F=Δ P/ (E*, Tramp+R), calculate required flow in setting Inspiratory rise time, wherein F is mean flow rate in Inspiratory rise time, Δ P representative pressure is poor, E is conductance, and Tramp is Inspiratory rise time, and R is vapour lock, E=1/C, C are compliance;
(3) in inlet valve and outlet valve synergic adjustment system, the upper limit coutroi velocity be less than in setting Inspiratory rise time is set as F;
(4) actual flow of timing measuring and calculating feedback valve output stream speed in Inspiratory rise time, when Inspiratory rise time is in setting Inspiratory rise time, when the valve output flow velocity monitored is less than upper limit coutroi velocity F, adopt slow method for improving, valve is exported flow velocity and slowly rise to upper limit coutroi velocity F; Described slow method for improving, specifically: reach 20% of the value of setting Inspiratory rise time at monitoring Inspiratory rise time before, flow is slowly risen to upper limit coutroi velocity F; Exceed 20% of the value of setting Inspiratory rise time at monitoring Inspiratory rise time after, carry out constant current ventilation by upper limit coutroi velocity F;
(5) after Inspiratory rise time exceedes setting Inspiratory rise time, removal inlet valve and outlet valve synergic adjustment system flow rate upper limit control restriction, transfer inlet valve to and pressure adjustment worked in coordination with by outlet valve.
The present invention utilizes the classical formulas in pneumodynamics principle to calculate the Inspiratory rise time under Stress control, according to the control flow calculated, adjust flux control valve exports according to certain mode, in order to realize the adjustment of Inspiratory rise time, solve in prior art the problem causing the software adjustment rise time not good because hardware resource is limited, to achieve in Anesthesia machine and lung ventilator Stress control under use traffic control valve mode, utilize software to the fine adjustment of Inspiratory rise time.
Accompanying drawing explanation
Fig. 1 is implementation block diagram of the present invention.
Detailed description of the invention
Fig. 1 is implementation block diagram of the present invention, wherein:
100 open Anesthesia machine and lung ventilator, make it be in normal air feed duty, and initiation pressure controls downslope slope adjustment and controls;
110 utilize Anesthesia machine and lung ventilator inner sensor, are estimated patient R, C value by R, C fast estimation technique;
120 according to formula F=Δ P/ (E*Tramp+R), calculates maximum output coutroi velocity in the set rise time; Wherein F is mean flow rate in Inspiratory rise time, and Δ P representative pressure is poor, and E is conductance, and Tramp is Inspiratory rise time, and R is vapour lock, and E=1/C, C are compliance;
The upper limit coutroi velocity be less than in setting Inspiratory rise time is set to F by 130, before reaching 20% of the value of setting Inspiratory rise time, adopts slow method for improving, flow is slowly risen to upper limit coutroi velocity F to upper limit coutroi velocity F at Inspiratory rise time; Exceed 20% of the value of setting Inspiratory rise time at Inspiratory rise time after, valve positioner is exported control flow and be adjusted to upper limit coutroi velocity F, according to upper limit coutroi velocity F, flow velocity PID control is carried out to valve;
140, after exceeding setting Inspiratory rise time, control according to compress control method, to reach required pressure.
Specific implementation step of the present invention is as follows:
Step 1, control initial state, when correctly not monitoring patient R, C value, according to setting pressure 50% carrying out a test property ventilate, estimate R, C value of patient during this period with R, C fast estimation technique, R is vapour lock, and C is compliance;
Step 2, in air-breathing initial period, according to formula F=Δ P/ (E*Tramp+R), calculate required flow in setting Inspiratory rise time, wherein F is mean flow rate in Inspiratory rise time, and E is conductance, and Tramp is Inspiratory rise time, R is vapour lock, and E=1/C, C are compliance;
Step 3, in inlet valve and outlet valve synergic adjustment system, by be less than setting Inspiratory rise time in upper limit coutroi velocity be set to F;
Step 4, the actual flow of timing measuring and calculating feedback valve output stream speed in Inspiratory rise time.Illustrate: when Inspiratory rise time is in setting Inspiratory rise time, when the valve output flow velocity monitored is less than upper limit coutroi velocity F, opened by control valve, valve is exported flow velocity and slowly rise to upper limit coutroi velocity F, concrete mode is as follows:
Reach before 20% of setting Inspiratory rise time at monitoring Inspiratory rise time, slow method for improving is adopted to upper limit coutroi velocity F, flow is slowly risen to upper limit coutroi velocity F, such as: when the rise time reaches 5% of setting-up time, air-breathing coutroi velocity is set to 25% of upper limit coutroi velocity F, when the rise time reaches 10% of setting Inspiratory rise time, air-breathing coutroi velocity is set to 50% of upper limit coutroi velocity F, when the rise time is more than or equal to 20% of setting Inspiratory rise time, air-breathing coutroi velocity is set to upper limit coutroi velocity F;
Exceed after 20% of setting Inspiratory rise time at monitoring Inspiratory rise time, carry out constant current ventilation by upper limit coutroi velocity F, valve positioner is exported control flow and be adjusted to upper limit coutroi velocity F, according to upper limit coutroi velocity F, flow velocity PID control is carried out to valve;
Step 5, after exceeding setting Inspiratory rise time, remove inlet valve and the outlet valve synergic adjustment system flow rate upper limit and control restriction, transfer inlet valve and outlet valve to and work in coordination with pressure and regulate.
After reaching setting Inspiratory rise time, now pressure ordinary circumstance can be less than setting pressure by about 10%, now controller maximum flow rate is controlled restriction to remove, utilize Stress control that residual compression is risen to set pressure, due to now little from setting pressure difference, only need the less flow of supply one just can reach, therefore there will not be pressure overshoot.
Claims (2)
1. Anesthesia machine, lung ventilator Stress control downslope slope adjustment method, for Stress control when Anesthesia machine and lung ventilator suction control valve and exhalation control valve collaborative work, is characterized in that:
(1), in control initial state, when correctly not monitoring patient R, C value, according to 50% carrying out a test property ventilation of setting pressure, R, C fast estimation technique is utilized to estimate R, C value of patient during this period;
(2) in air-breathing initial period, according to formula F=Δ P/ (E*Tramp+R), calculate required flow in setting Inspiratory rise time, wherein F is mean flow rate in Inspiratory rise time, and Δ P representative pressure is poor, and E is conductance, Tramp is Inspiratory rise time, R is vapour lock, and E=1/C, C are compliance;
(3) in inlet valve and outlet valve synergic adjustment system, the upper limit coutroi velocity be less than in setting Inspiratory rise time is set as F;
(4) actual flow of timing measuring and calculating feedback valve output stream speed in Inspiratory rise time, when Inspiratory rise time is in setting Inspiratory rise time, when the valve output flow velocity monitored is less than upper limit coutroi velocity F, adopt slow method for improving, valve is exported flow velocity and slowly rise to upper limit coutroi velocity F; Described slow method for improving, specifically: reach 20% of the value of setting Inspiratory rise time at monitoring Inspiratory rise time before, flow is slowly risen to upper limit coutroi velocity F; Exceed 20% of the value of setting Inspiratory rise time at monitoring Inspiratory rise time after, carry out constant current ventilation by upper limit coutroi velocity F;
(5) after Inspiratory rise time exceedes setting Inspiratory rise time, removal inlet valve and outlet valve synergic adjustment system flow rate upper limit control restriction, transfer inlet valve to and pressure adjustment worked in coordination with by outlet valve.
2. Anesthesia machine according to claim 1, lung ventilator Stress control downslope slope adjustment method, it is characterized in that: when reaching 5% of setting Inspiratory rise time when Inspiratory rise time, air-breathing coutroi velocity is set to 25% of upper limit coutroi velocity F, when Inspiratory rise time reaches 10% of setting Inspiratory rise time, air-breathing coutroi velocity is set to 50% of upper limit coutroi velocity F, when Inspiratory rise time is more than or equal to 20% of setting Inspiratory rise time, air-breathing coutroi velocity is set to upper limit coutroi velocity F.
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| CN201010275580.7A CN102397610B (en) | 2010-09-07 | 2010-09-07 | Method for adjusting gradient of slope under anesthesia machine and breathing machine pressure control |
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| CN201010275580.7A CN102397610B (en) | 2010-09-07 | 2010-09-07 | Method for adjusting gradient of slope under anesthesia machine and breathing machine pressure control |
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| CN102397610B true CN102397610B (en) | 2015-03-25 |
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| CN106902431B (en) * | 2015-12-22 | 2019-07-16 | 北京谊安医疗系统股份有限公司 | The control method of ramp up time in turbine Anesthesia machine PCV ventilating mode |
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|---|---|---|---|---|
| US5546952A (en) * | 1994-09-21 | 1996-08-20 | Medtronic, Inc. | Method and apparatus for detection of a respiratory waveform |
| CN101132825A (en) * | 2005-03-04 | 2008-02-27 | Map医药-技术有限责任公司 | Device for administering a breathing gas and method for adjusting breathing gas pressures that alternate at least in some phases |
| CN101365507A (en) * | 2005-10-11 | 2009-02-11 | 伟亚医疗系统制造有限公司 | System and method for circuit compliance compensated volume control in a patient respiratory ventilator |
| CN101757711A (en) * | 2008-12-11 | 2010-06-30 | 北京谊安医疗系统股份有限公司 | Ventilator and method for controlling pressure slope thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP5715066B2 (en) * | 2008-12-19 | 2015-05-07 | コーニンクレッカ フィリップス エヌ ヴェ | System and method for treating lung disease using positive airway pressure support |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5546952A (en) * | 1994-09-21 | 1996-08-20 | Medtronic, Inc. | Method and apparatus for detection of a respiratory waveform |
| CN101132825A (en) * | 2005-03-04 | 2008-02-27 | Map医药-技术有限责任公司 | Device for administering a breathing gas and method for adjusting breathing gas pressures that alternate at least in some phases |
| CN101365507A (en) * | 2005-10-11 | 2009-02-11 | 伟亚医疗系统制造有限公司 | System and method for circuit compliance compensated volume control in a patient respiratory ventilator |
| CN101757711A (en) * | 2008-12-11 | 2010-06-30 | 北京谊安医疗系统股份有限公司 | Ventilator and method for controlling pressure slope thereof |
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Effective date of registration: 20221121 Address after: Building 2A, No. 77, Jinke South 2nd Road, Jinniu Hi tech Industrial Park, Chengdu, Sichuan 610036 Patentee after: Aerospace Changfeng Medical Technology (Chengdu) Co.,Ltd. Address before: 100854, Beijing Yongding Road, No. 51, Haidian District Aerospace digital control building Patentee before: BEIJING AEROSPACE CHANGFENG Co.,Ltd. |
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