CN103977492B - A kind of method controlling ventilation air leakage based on pressure waveform estimated capacity - Google Patents
A kind of method controlling ventilation air leakage based on pressure waveform estimated capacity Download PDFInfo
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- CN103977492B CN103977492B CN201410232734.2A CN201410232734A CN103977492B CN 103977492 B CN103977492 B CN 103977492B CN 201410232734 A CN201410232734 A CN 201410232734A CN 103977492 B CN103977492 B CN 103977492B
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Abstract
The invention belongs to a kind of evaluation method of respirator volume controlled ventilation air leakage, be specifically related to a kind of method of carrying out the estimation of volume controlled ventilation air leakage based on pressure waveform and peak value thereof.Its step comprises, under noinvasive volume controlled ventilation pattern, airline pressure signal is gathered at respirator air feed end, obtain venting pressure waveform and pressure peak, utilize the pressure waveform curve that collects and pressure waveform standard curve compare thus determine grade of leaking gas, utilize the pressure peak extracted to estimate air leakage in the breathing cycle based on pressure peak-gas leakage relation.
Description
Technical field
The invention belongs to a kind of evaluation method of respirator volume controlled ventilation air leakage, be specifically related to a kind of method of carrying out the estimation of volume controlled ventilation air leakage based on pressure waveform and peak value thereof.
Background technology
Respirator is the necessary armarium rescuing patients with respiratory failure, treatment respiratory system disease, by tracheal intubation formula Invasive vent ilation or wear face shield, oronasal mask etc. ventilation interface invasive ventilation realize, main ventilating mode comprises volume controlled ventilation pattern and pressure controlled ventilation pattern.Although invasive ventilation because of its without the need to carry out tracheal intubation, patient tolerability good, not easily cause the advantages such as Secondary cases injury of lung, be applied to family and clinical just more and more, but gas leakage is inevitable problem in invasive ventilation.Gas leakage may cause patient ventilation's quantity not sufficient, reduce ventilation toleration, have a strong impact on ventilatory effect, even may life-threatening, under invasive ventilation state, therefore carry out real-time gas leakage estimate and carry out corresponding leak compensation to be key issue in invasive ventilation process.The present invention constructs the evaluation method that a kind of respirator carries out air leakage under volume controlled ventilation, namely the approximate evaluation of gas leakage degree can be realized, the quantitative estimation of air leakage can be carried out again, in the air leakage in the expiratory phase prediction whole cycle of breathing cycle, theoretical reference can be provided for quantitatively carrying out leak compensation.The concrete steps of the volume controlled ventilation air leakage evaluation method that the present invention relates to comprise, airline pressure is detected in real time at air feed end in volume controlled ventilation process, carry out sorting out according to airline pressure wave characteristics with reference to pressure waveform standard curve and estimate gas leakage degree, and the airline pressure peak value at the ventilation initial stage of utilization appearance estimates the air leakage in current breathing cycle according to pressure peak-air leakage relation function.
Summary of the invention
The present invention seeks to build the method for air leakage estimation in a kind of noinvasive volume controlled ventilation process, by the identification to airline pressure wave character, the invention provides a kind of method controlling ventilation air leakage based on pressure waveform estimated capacity.
Its step comprises, under noinvasive volume controlled ventilation pattern, airline pressure signal is gathered at respirator air feed end, obtain venting pressure waveform and pressure peak, the pressure waveform curve that utilization collects and pressure waveform standard curve are compared thus determine grade of leaking gas, and estimate the air leakage in this breathing cycle based on the pressure peak that pressure peak-utilization of gas leakage relation is extracted.
Further, the collection of airline pressure signal as above the pipeline that is connected with sufferer at respirator is arranged near respirator suction end arrange the pressure signal that pressure transducer gathers gas circuit;
Further, pressure waveform as above and pressure peak by the feature of collection pressure signal, pressure waveform curve is described by 3 characteristic points, comprising pressure peak and pressure curve descending branch flex point;
Further, pressure waveform standard curve as above be one group for distinguishing the typical pressure wavy curve of gas leakage degree, comprising under volume controlled ventilation condition without the pressure waveform corresponding to gas leakage, a small amount of gas leakage (gas leakage less than 10%), middle amount gas leakage (gas leakage 10-35%), a large amount of gas leakage (gas leakage is greater than 35%) 4 kinds of gas leakage degree;
Further, pressure peak as above-air leakage relation function is the linear relationship of gas circuit pressure peak and this breathing cycle air leakage under volume controlled ventilation, and its form is: V
leak=K ﹒ P
max+ B, wherein V
leakbe air leakage approximate in the breathing cycle, P
maxfor airline pressure peak value, K and B is parameter is based on gas leakage test experience platform, and the basis of great amount of samples experiment obtains;
Further, air leakage estimation as above carries out linear operation by airline pressure peak value being brought into pressure peak-air leakage relation function, obtains approximate air leakage in this breathing cycle.
Accompanying drawing explanation
Fig. 1 method implementing procedure figure, description of reference numerals: 01-respirator volume control invasive ventilation module, 02-invasive ventilation object, 03-pressure transducer, 04-pressure waveform signal, 05-pressure peak, 06-pressure waveform standard curve, 07-leaks gas degree, 08-pressure peak and air leakage relation function, 09-air leakage
Airline pressure wave character point labelling in the breathing cycle of Fig. 2, accompanying drawing illustrates: the peak point of A-airline pressure, B-peak point drops to the flex point of platform section, and C-pressure platform section is to the flex point of very fast descending branch
Fig. 3 pressure waveform standard curve
Fig. 4 pressure peak-air leakage relation function curve
Detailed description of the invention
Below in conjunction with accompanying drawing and specific embodiment, the present invention is described in further detail.
Be illustrated in figure 1 a kind of key step controlling the method for ventilation air leakage based on pressure waveform estimated capacity, specifically comprise:
(1) for respirator volume control invasive ventilation, gas pressure sensor is placed, with venting process Real-time Collection airline pressure signal at respirator air feed end;
(2) according to collected airline pressure signal, form the pressure waveform curve of breathing cycle one by one, as shown in Figure 2, and to airline pressure signal extraction wavy curve characteristic point, as Fig. 2 the A point, B point, the C point that mark, wherein A point is the peak point of airline pressure, and B point is the flex point being dropped to platform section by peak point, and C point is the flex point from platform section to very fast descending branch.
(3) the airline pressure wavy curve obtained and pressure waveform standard curve compared and then estimate gas leakage degree, as shown in Figure 3, when a small amount of gas leakage (gas leakage is less than 10%) occurs, A, B, C tri-characteristic points are all visible, but A point declines to some extent, when gas leakage degree continue to increase reach medium time (10%< air leakage <35%) B point fade away, when very large (air leakage >35%) C point of gas leakage degree fades away;
(4) can be brought into the approximation calculating in pressure peak-air leakage relation function and try to achieve air leakage according to airline pressure peak value, wherein pressure peak-air leakage relation function is first order linear function V
leak=-172P
max+ 584, its curve as shown in Figure 4;
The method controlling ventilation air leakage based on pressure waveform estimated capacity detects based on airline pressure, realizes with reference to serial pressure waveform standard curve and pressure peak-air leakage relation function.Wherein utilize detected pressures wavy curve and the comparison of pressure waveform standard curve only can obtain the gas leakage degree be similar to, and utilize airline pressure peak value and air leakage relation function can obtain quantitative air leakage.
Claims (3)
1. control a method for ventilation air leakage based on pressure waveform estimated capacity, carrying out with volume control pattern carrying out the estimation of invasive ventilation air leakage under invasive ventilation condition, described method concrete steps comprise:
S1 carries out the detection of airline pressure while carrying out invasive ventilation with volume control pattern to sufferer (02) based on respirator (01) at respirator air feed end placement force sensor (03);
S2 to the pressure signal in gas circuit, obtains real-time pressure waveform signal (04) by pressure transducer (03) Real-time Collection, obtains pressure waveform feature, comprises pressure peak, pressure waveform decline flex point;
S3, for the airline pressure signal in the breathing cycle, obtains pressure curve waveform, compares, realize the estimation of gas leakage degree (07) with reference to pressure waveform standard curve (06);
S4 utilizes the pressure peak (05) extracted, and according to based on pressure peak-air leakage approximation relation function (08), estimates, obtains the approximate air leakage (09) of each breathing cycle in volume controlled ventilation process;
It is characterized in that: the approximate air leakage (09) of a breathing cycle is carried out linear operation obtain by airline pressure peak value being brought into pressure peak-air leakage approximation relation function.
2. as claimed in claim 1 a kind of based on pressure waveform estimated capacity control ventilation air leakage method, it is characterized in that: at air feed end Real-time Collection airline pressure signal in volume controlled ventilation process, extract the characteristic point of pressure waveform signal (04), comprise pressure peak point (A), flex point (B) that pressure peak point drops to platform section and pressure platform section be to the flex point (C) of very fast descending branch.
3. as claimed in claim 1 a kind of based on pressure waveform estimated capacity control ventilation air leakage method, it is characterized in that: pressure peak-air leakage approximation relation function (08) describes the linear relationship of gas circuit pressure peak and the approximate air leakage of a breathing cycle under volume controlled ventilation, and its form is: V
leak=-172 ﹒ P
max+ 584, wherein V
leakbe the approximate air leakage of a breathing cycle, its unit is ml, P
maxfor airline pressure peak value, its unit is kPa, and this linear relation is based on gas leakage test experience platform, and the basis of great amount of samples experiment obtains.
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| CN201410232734.2A CN103977492B (en) | 2014-05-29 | 2014-05-29 | A kind of method controlling ventilation air leakage based on pressure waveform estimated capacity |
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| CN201410232734.2A CN103977492B (en) | 2014-05-29 | 2014-05-29 | A kind of method controlling ventilation air leakage based on pressure waveform estimated capacity |
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| CN103977492A CN103977492A (en) | 2014-08-13 |
| CN103977492B true CN103977492B (en) | 2016-04-27 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105963835B (en) * | 2016-04-21 | 2018-03-06 | 广州七喜医疗设备有限公司 | A kind of method of VCV leak compensations |
| CN106975135B (en) * | 2017-04-11 | 2019-09-27 | 湖南明康中锦医疗科技发展有限公司 | Method and device for air leakage compensation of respirator and noninvasive respirator |
| CN108287043B (en) * | 2017-12-29 | 2020-03-10 | 湖南明康中锦医疗科技发展有限公司 | Breathing machine air leakage detection method and device, storage medium and computer equipment |
| CN112368042B (en) * | 2018-08-21 | 2024-02-06 | 深圳迈瑞生物医疗电子股份有限公司 | Ventilation detection method and device, ventilation equipment and storage medium |
| CN114681736B (en) * | 2022-03-30 | 2022-10-18 | 广东省医疗器械质量监督检验所 | Respirator abnormality detection method and respirator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6553992B1 (en) * | 2000-03-03 | 2003-04-29 | Resmed Ltd. | Adjustment of ventilator pressure-time profile to balance comfort and effectiveness |
| WO2010088543A1 (en) * | 2009-01-29 | 2010-08-05 | Aylsworth Alonzo C | Method and system for detecting mouth leak during application of positive airway pressure |
| US8707952B2 (en) * | 2010-02-10 | 2014-04-29 | Covidien Lp | Leak determination in a breathing assistance system |
| NZ722192A (en) * | 2010-07-30 | 2018-01-26 | Resmed Ltd | Methods and devices with leak detection |
| CN103071213A (en) * | 2011-10-25 | 2013-05-01 | 北京航天长峰股份有限公司 | Leakage compensation method for single-loop non-invasive ventilators |
| CN102944371B (en) * | 2012-11-06 | 2016-01-06 | 北京航空航天大学 | A kind of detection system for noninvasive ventilation interface |
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