CN102266622B - Startup self-checking method and device for anaesthesia machine - Google Patents
Startup self-checking method and device for anaesthesia machine Download PDFInfo
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- 206010002091 Anaesthesia Diseases 0.000 title claims abstract description 58
- 230000037005 anaesthesia Effects 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000001949 anaesthesia Methods 0.000 title abstract 5
- 230000003434 inspiratory effect Effects 0.000 claims description 14
- 238000001514 detection method Methods 0.000 abstract description 10
- 239000007789 gas Substances 0.000 description 35
- 238000012360 testing method Methods 0.000 description 15
- 238000010998 test method Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 8
- 238000005259 measurement Methods 0.000 description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000005399 mechanical ventilation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 230000029058 respiratory gaseous exchange Effects 0.000 description 2
- 230000036962 time dependent Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000011895 specific detection Methods 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
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Abstract
The invention provides a startup self-checking method and device for an anaesthesia machine, and used for solving the problem that the compliance detection result of the anaesthesia machine in the prior art is not accurate enough. The method comprises the following steps: establishing a first compliance equation according to inspiration volume change and airway pressure change within a preset pressure rise time period; establishing a second compliance equation according to gas leakage volume and air pressure change within a preset pressure drop time period; obtaining the compliance and system leakage speed of the anaesthesia machine; and outputting the calculated compliance and system leakage speed. The technical scheme provided by the invention enhances the compliance detection accuracy, and improves the overall performance of the anaesthesia machine.
Description
Technical Field
The invention relates to a power-on self-test method and a power-on self-test device for an anesthesia machine.
Background
The breathing loop is a combined gas circuit device which is connected with the anesthesia machine and the patient, delivers anesthesia mixed gas for the patient and delivers expired gas for the patient, thereby realizing normal exchange of oxygen and carbon dioxide.
Conventional compliance detection is only calculated by tidal volume changes versus pressure changes, and when the system has a leak, the calculated compliance is inaccurate.
In the prior art, the compliance detection result of the anesthesia machine is not accurate enough, and no effective solution is provided for the problem.
Disclosure of Invention
The invention mainly aims to provide a power-on self-test method and a power-on self-test device for an anesthesia machine, so as to solve the problem that the compliance detection result of the anesthesia machine in the prior art is not accurate enough.
In order to achieve the above object, according to one aspect of the present invention, a method and an apparatus for self-test of anesthesia machines are provided.
The power-on self-test method of the anesthesia machine comprises the following steps: inputting gas into an airway through an inhalation valve, constructing a compliance first equation according to inhalation volume variation and airway pressure variation in a preset pressure rise time period on the airway pressure rise edge, wherein the volume variation in the compliance first equation is expressed according to the flow rate of the gas at the inhalation valve and the system leakage speed of an anesthesia machine; stopping inputting gas into the airway, releasing the gas in the airway through the expiratory valve, closing the expiratory valve when the pressure of the airway reaches a preset value, and constructing a compliance second equation according to the volume of the gas leaked in a preset pressure drop time period and the variation of the pressure of the airway in a drop edge formed by the pressure of the airway leaked from a system; calculating the compliance of the anesthesia machine and the system leakage speed of the anesthesia machine according to the compliance first equation and the compliance second equation; outputting the calculated compliance and the system leak rate.
Further, the first compliance equation in the method for the anesthesia machine startup self-test of the invention is as follows: c ═ C (F1-F) × t1 ÷ (P2-P1); where C denotes compliance, F1 denotes the flow rate of gas at the inspiratory valve, F denotes the system leak rate, t1 denotes the pressure rise period, and P1 and P2 denote the pressure of the airway at the start and end of the pressure rise period, respectively.
Further, in the method for self-test of the anesthesia machine power-on of the present invention, F1 is the flow rate of the gas after the flow rate at the inhalation valve is stabilized. P1-10 cmH20 and P2-50 cmH 20.
Further, in the method for the power-on self-test of the anesthesia machine, a second compliance equation is as follows: c ═ F × t2 ÷ (P8-P9); where C denotes compliance, F1 denotes the flow rate of gas at the inspiratory valve, F denotes the system leak rate, t2 denotes the pressure drop period, and P8 and P9 denote the pressure at the start and end of the airway at the start and end of the pressure drop period, respectively.
Further, in the power-on self-test method of the anesthesia machine, P8 is the airway pressure 2.5 seconds after the airway pressure reaches 35cmH 20; p9 is the airway pressure 20 seconds after the airway pressure reached P8.
According to another aspect of the present invention, there is provided a power-on self-test apparatus for an anesthesia machine, comprising: the first equation module is used for constructing a compliance first equation according to the inhalation volume change and the airway pressure change in a preset pressure rise time period on the rising edge of the airway pressure, and the volume change in the compliance first equation is expressed according to the flow rate of gas at an inhalation valve and the system leakage speed of the anesthesia machine; the second equation module is used for closing the expiratory valve when the airway pressure reaches a preset value, and constructing a second compliance equation according to the volume of the leaked gas and the variation of the airway pressure in a preset pressure drop time period in a drop edge formed by the airway pressure due to system leakage; and the calculation module is used for calculating the compliance of the anesthesia machine and the system leakage speed of the anesthesia machine according to the compliance first equation and the compliance second equation.
Further, a first equation of compliance in the device for the power-on self-test of the anesthesia machine is as follows: c ═ C (F1-F) × t1 ÷ (P2-P1); where C denotes compliance, F1 denotes the flow rate of gas at the inspiratory valve, F denotes the system leak rate, t1 denotes the pressure rise period, and P1 and P2 denote the pressure of the airway at the start and end of the pressure rise period, respectively.
Further, a second equation of compliance in the device for the power-on self-test of the anesthesia machine is as follows: c ═ F × t2 ÷ (P8-P9); where C denotes compliance, F1 denotes the flow rate of gas at the inspiratory valve, F denotes the system leak rate, t2 denotes the pressure drop period, and P8 and P9 denote the pressure at the start and end of the airway at the start and end of the pressure drop period, respectively.
According to the technical scheme of the invention, a compliance first equation is constructed according to the suction volume variation and the airway pressure variation in the preset pressure rise time period; constructing a compliance second equation according to the volume of the leaked gas and the change of the airway pressure in the preset pressure drop time period; thereby obtaining the compliance of the anesthesia machine and the system leakage speed of the anesthesia machine; the calculated compliance and system leak rate are then output. Thereby adding to the calculation of system leakage and improving the accuracy of compliance detection.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a schematic diagram of the main steps of a power-on self-test method of an anesthesia machine according to an embodiment of the present invention;
FIG. 2(a) is a schematic diagram illustrating the time-dependent change of the air duct pressure in the power-on self-test method of the anesthesia machine according to the embodiment of the present invention;
FIG. 2(b) is a schematic diagram illustrating a partial gas path principle of a power-on self-test method for an anesthesia machine according to an embodiment of the present invention; and
fig. 3 is a schematic diagram of main blocks of an apparatus for power-on self-test of an anesthesia machine according to an embodiment of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Fig. 1 is a schematic diagram of main steps of a power-on self-test method of an anesthesia machine according to an embodiment of the present invention, as shown in fig. 1, the method mainly includes the following steps:
step S11: inputting gas into an air passage through an inhalation valve, constructing a compliance first equation according to inhalation volume variation and air passage pressure variation in a preset pressure rise time period on the air passage pressure rise edge, and expressing the volume variation in the compliance first equation according to the flow rate of the gas at the inhalation valve and the system leakage speed of the anesthesia machine;
step S13: stopping inputting gas into the airway, releasing the gas in the airway through the expiratory valve, closing the expiratory valve when the pressure of the airway reaches a preset value, and constructing a compliance second equation according to the volume of the gas leaked in a preset pressure drop time period and the variation of the pressure of the airway in a drop edge formed by the pressure of the airway leaked from a system;
step S15: calculating the compliance of the anesthesia machine and the system leakage speed of the anesthesia machine according to the compliance first equation and the compliance second equation;
step S17: and outputting the calculated compliance and the system leakage speed.
As can be seen from the steps, the compliance of the anesthesia machine and the system leakage speed of the anesthesia machine are obtained according to the compliance first equation and the compliance second equation, and then the calculated compliance and the system leakage speed are output. Thereby adding to the calculation of system leakage and improving the accuracy of compliance detection.
Wherein the compliance first approach may be: c ═ C (F1-F) × t1 ÷ (P2-P1); where C denotes compliance, F1 denotes the flow rate of gas at the inspiratory valve, F denotes the system leak rate, t1 denotes the pressure rise period, and P1 and P2 denote the pressure of the airway at the start and end of the pressure rise period, respectively. In particular, F1 is the flow rate of the gas after the flow rate has stabilized at the suction valve. P1-10 cmH20 and P2-50 cmH 20. In addition, the second equation of compliance is: c ═ F × t2 ÷ (P8-P9); where C denotes compliance, F1 denotes the flow rate of gas at the inspiratory valve, F denotes the system leak rate, t2 denotes the pressure drop period, and P8 and P9 denote the pressure at the start and end of the pressure drop period, respectively, of the airway. Note that P8 is the airway pressure 2.5 seconds after the airway pressure reached 35cmH 20; p9 is the airway pressure 20 seconds after the airway pressure reached P8.
FIG. 2(a) is a schematic diagram illustrating the time-dependent change of the air duct pressure in the power-on self-test method of the anesthesia machine according to the embodiment of the present invention; fig. 2(b) is a schematic diagram of a part of gas path principle of the anesthesia machine startup self-test method according to the embodiment of the invention. As shown in fig. 2, the nodes in (a) and the reference numerals in (b) in the drawings are described correspondingly: in the figure (a), the first and second images are shown,
p0, F0-indicating wood Start Inlet node, flow, respectively (flow in this context refers to intake after intake valve)
Airflow) and the starting point of airway pressure (closing the exhalation valve, adjusting the intake valve);
f1-the flow oscillation reaches the stable node;
p1-airway pressure reached 10cmH2O node;
p2-airway pressure reached 50cmH2O node;
p3 — relief valve open node;
p4 — relief valve opening threshold measurement start node;
p5, F2-starting node of safety valve opening threshold measurement, closing inlet valve, adjusting pressure value of expiratory valve to make airway pressure equal to 35cmH 2O;
p6-airway pressure reached 35cmH2O node;
p7-airway pressure oscillations reach stable nodes;
p8-leak measurement Start node 2.5s after P6 node;
p9-the leakage measurement end node 20s after the P8 node, the expiratory valve is fully opened;
p10-node for balancing pressure inside and outside the airway.
In the figure (b) of the drawings,
1-the patient is present;
2-airway pressure;
3-ambient pressure;
4-sensor board;
5-air suction unidirectional;
6-exhalation one-way;
7-pressure reducing valve 1.8 bar;
8-an air suction valve;
9-flow rate detecting probe;
10-safety valve;
11-venting to atmosphere;
12-soda lime tank.
The specific detection method comprises the following steps:
(1) closing the expiratory valve, and giving a fixed flow rate F1 (adjusted in real time according to the monitoring value of the flow sensor behind the inspiratory valve) by the inspiratory valve;
(2) after the flow rates stabilized, pressures P1 and P2 were recorded, and the time t1 at which the pressure rose was recorded. Assuming that the system leakage is F, a compliance equation can be derived: c ═ Δ V ÷ (Δ P) ═ F1-F × t1 ÷ (P2-P1) … … (r)
(3) And continuously supplying gas to the gas suction valve to open the safety valve, and detecting the safety valve. Then, the gas supply is stopped and the gas is discharged to the pressure P6;
(4) close the exhalation valve and wait a period of time until the pressure stabilizes at P8. And waiting for time t2 again, reading airway pressure P9. Assuming that the system leakage is F, a compliance equation can be derived: c ═ Δ V ÷ Δ P ═ F × t2 ÷ (P8-P9) … … ②
(5) Compliance C and leakage F can be calculated according to the above equations (r) and (r).
The compliance of the breathing pipeline is obtained by starting up compliance detection, and the compliance detection is used for compensating the tidal volume during mechanical ventilation, so that the tidal volume control precision of the mechanical ventilation is improved. Due to the power-on self-test, the method provided by the embodiment of the invention is safe and reliable in practical application, is convenient to operate, and improves the overall performance of the anesthesia machine.
Fig. 3 is a schematic diagram of main blocks of an apparatus for power-on self-test of an anesthesia machine according to an embodiment of the present invention. As shown in fig. 3:
the device 30 for power-on self-test of the anesthesia machine of the embodiment of the present invention comprises:
the first equation module 31 is used for constructing a compliance first equation according to the inhalation volume change and the airway pressure change in the preset pressure rise time period on the airway pressure rise edge, and the volume change in the compliance first equation is expressed according to the flow rate of gas at an inhalation valve and the system leakage speed of the anesthesia machine;
a second equation module 33, configured to close the exhalation valve when the airway pressure reaches a preset value, and in a falling edge of the airway pressure due to system leakage, construct a second equation of compliance according to the volume of gas leaked in a preset pressure falling time period and the variation of the airway pressure;
and the calculating module 35 is used for calculating the compliance of the anesthesia machine and the system leakage speed of the anesthesia machine according to the compliance first equation and the compliance second equation.
The first compliance equation in the power-on self-test device of the anesthesia machine provided by the embodiment of the invention is as follows: c ═ C (F1-F) × t1 ÷ (P2-P1); where C denotes compliance, F1 denotes the flow rate of gas at the inspiratory valve, F denotes the system leak rate, t1 denotes the pressure rise period, and P1 and P2 denote the pressure of the airway at the start and end of the pressure rise period, respectively. The second equation of compliance is: c ═ F × t2 ÷ (P8-P9); where C denotes compliance, F1 denotes the flow rate of gas at the inspiratory valve, F denotes the system leak rate, t2 denotes the pressure drop period, and P8 and P9 denote the pressure at the start and end of the airway at the start and end of the pressure drop period, respectively.
According to the technical scheme of the embodiment of the invention, a compliance first equation is constructed according to the suction volume variation and the airway pressure variation in the preset pressure rise time period; constructing a compliance second equation according to the volume of the leaked gas and the change of the airway pressure in the preset pressure drop time period; thereby obtaining the compliance of the anesthesia machine and the system leakage speed of the anesthesia machine; the calculated compliance and system leak rate are then output. Thereby adding to the calculation of system leakage and improving the accuracy of compliance detection.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and they may alternatively be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, or fabricated separately as individual integrated circuit modules, or fabricated as a single integrated circuit module from multiple modules or steps. Thus, the present invention is not limited to any specific combination of hardware and software.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A method for self-checking when an anesthesia machine is started up is characterized by comprising the following steps:
inputting gas into an air passage through an inhalation valve, constructing a compliance first equation according to inhalation volume variation and air passage pressure variation in a preset pressure rise time period on the air passage pressure rise edge, and expressing the volume variation in the compliance first equation according to the flow rate of the gas in the inhalation valve and the system leakage speed of an anesthesia machine;
stopping inputting gas into the airway, releasing the gas in the airway through the expiratory valve, closing the expiratory valve when the pressure of the airway reaches a preset value, and constructing a compliance second equation according to the volume of the gas leaked in a preset pressure drop time period and the variation of the pressure of the airway in a drop edge formed by the pressure of the airway leaked from a system;
calculating the compliance of the anesthesia machine and the system leakage speed of the anesthesia machine according to the compliance first equation and the compliance second equation;
outputting the calculated compliance and the system leak rate.
2. The method of claim 1, wherein the compliance first equation is:
c = (F1-F) × t1 ÷ (P2-P1); wherein,
c denotes compliance, F1 denotes the flow rate of gas at the inspiratory valve, F denotes the system leak rate, t1 denotes the pressure rise period, P1 and P2 denote the pressure of the airway at the start and end of the pressure rise period, respectively.
3. The method of claim 2, wherein F1 is the flow rate of the gas after the flow rate is stabilized at the suction valve.
4. The method of claim 2, wherein P1=10cmH2O and P2=50cmH 2O.
5. The method of any of claims 1 to 4, wherein the second compliance equation is:
c = F × t2 ÷ (P8-P9); wherein,
c denotes compliance, F1 denotes the flow rate of gas at the inspiratory valve, F denotes the system leak rate, t2 denotes the pressure drop period, P8 and P9 denote the pressure of the airway at the start and end of the pressure drop period, respectively.
6. The method of claim 5, wherein P8 is airway pressure 2.5 seconds after airway pressure reached 35cmH 2O; p9 is the airway pressure 20 seconds after the airway pressure reached P8.
7. The utility model provides a device of anesthesia machine power-on self-checking which characterized in that includes:
the first equation module is used for constructing a compliance first equation according to the inhalation volume variation and the airway pressure variation in a preset pressure rise time period on the airway pressure rise edge when gas is input into the airway through the inhalation valve, and the volume variation in the compliance first equation is expressed according to the flow rate of the gas at the inhalation valve and the system leakage speed of the anesthesia machine;
the second equation module is used for closing the expiratory valve when the pressure of the airway reaches a preset value when the gas input into the airway is stopped and the gas in the airway is released through the expiratory valve, and constructing a compliance second equation according to the volume of the gas leaked in a preset pressure reduction time period and the variation of the pressure of the airway in a falling edge formed by the pressure of the airway leaked due to system leakage;
the calculation module is used for calculating the compliance of the anesthesia machine and the system leakage speed of the anesthesia machine according to the compliance first equation and the compliance second equation;
and the output module is used for outputting the compliance and the system leakage speed which are obtained through calculation.
8. The apparatus of claim 7, wherein the compliance first equation is:
c = (F1-F) × t1 ÷ (P2-P1); wherein,
c denotes compliance, F1 denotes the flow rate of gas at the inspiratory valve, F denotes the system leak rate, t1 denotes the pressure rise period, P1 and P2 denote the pressure of the airway at the start and end of the pressure rise period, respectively.
9. The apparatus of claim 7 or 8, wherein the second compliance equation is:
c = F × t2 ÷ (P8-P9); wherein,
c denotes compliance, F1 denotes the flow rate of gas at the inspiratory valve, F denotes the system leak rate, t2 denotes the pressure drop period, P8 and P9 denote the pressure of the airway at the start and end of the pressure drop period, respectively.
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| CN103893876B (en) * | 2012-12-27 | 2016-03-02 | 北京谊安医疗系统股份有限公司 | Anesthetic machine airway pressure sensor startup self-detection method |
| CN103900644B (en) * | 2012-12-28 | 2017-12-08 | 北京谊安医疗系统股份有限公司 | A kind of Anesthesia machine machine control leak-testing control method and device |
| CN114681739B (en) * | 2020-12-30 | 2024-07-30 | 深圳迈瑞生物医疗电子股份有限公司 | Anesthesia breathing equipment and breathing circuit compliance detection method |
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| US7886739B2 (en) * | 2005-10-11 | 2011-02-15 | Carefusion 207, Inc. | System and method for circuit compliance compensated volume control in a patient respiratory ventilator |
| CN101467880B (en) * | 2007-12-28 | 2012-06-27 | 北京谊安医疗系统股份有限公司 | Method for improving tidal volume control and detection accuracy by introducing R value for calculation |
| US9474469B2 (en) * | 2008-10-24 | 2016-10-25 | Hospitech Respiration Ltd. | Method and system for ventilation |
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