A method for simultaneously detecting leaks and compliance in an anesthesia machine

Abstract

The present application relates to the field of anesthetic machine leakage and compliance detection, and particularly relates to a method for simultaneously detecting leakage and compliance in an anesthetic machine. The leakage is expressed as the flow rate of gas flowing to the atmosphere through an analog gas resistance R at a certain air pressure; a circuit simulation model of the lung when the anesthetic machine has leakage is established; according to the circuit simulation model of the lung when the anesthetic machine has leakage, an equation relationship between the analog gas resistance R and the compliance during the inflation process is listed, and the leakage and the compliance are obtained. The present application expresses the leakage as the flow rate of gas flowing to the atmosphere through an analog gas resistance R at a certain air pressure, and establishes a circuit simulation model of the lung when the anesthetic machine has leakage, so that the measurement, analysis and calculation process is specified and simplified.

Description

Technical Field

[0001] This invention relates to the field of anesthesia machine leakage and compliance detection, and particularly to a method for simultaneously detecting leakage and compliance in anesthesia machines. Background Technology

[0002] Leakage and compliance testing are essential tests that must be performed before anesthesia machines are turned on and put into normal operation. Leakage testing measures the leakage of the entire ventilation circuit when only the ventilation circuit is connected. Compliance testing checks the compliance of the connected tubing to accurately calculate the ventilation volume for the patient.

[0003] Currently, leakage detection and compliance detection in anesthesia machines are implemented as two separate functions. Two consecutive tests are required when the machine is turned on to complete the detection, resulting in a long total detection time. Furthermore, there is a fixed order of leakage detection first and compliance detection second. In the leakage detection, a default compliance value is also used to estimate the leakage amount, which leads to a certain degree of error in the leakage detection results.

[0004] Disadvantages of traditional anesthesia machine leakage and compliance testing:

[0005] 1. The two testing processes are conducted separately, resulting in a longer testing time;

[0006] 2. The two testing processes must be performed in a specific order: leak detection must be performed first, followed by compliance testing.

[0007] 3. Leak detection relies on default compliance values ​​or previous compliance values, leading to increased leakage errors;

[0008] 4. Errors in leakage can lead to some errors in subsequent compliance. Summary of the Invention

[0009] The purpose of this invention is to address the shortcomings of the above-mentioned detection methods by proposing a method for simultaneously detecting leakage and compliance, thereby reducing the overall detection time and eliminating the transmission effect of errors.

[0010] To achieve the above objectives, the present invention is implemented through the following technical solution.

[0011] This invention proposes a method for simultaneously detecting leakage and compliance in anesthesia machines, the method comprising:

[0012] The leakage is expressed as the flow velocity of gas through a simulated air resistance R to the atmosphere at a certain air pressure.

[0013] Establish a circuit simulation model of the lungs when there is a leak in the anesthesia machine;

[0014] Based on the circuit simulation model of the lungs when there is leakage in the anesthesia machine, the equation relationship between the simulated air resistance R and compliance during the inflation process is listed, and the leakage amount and compliance are obtained.

[0015] As an improvement to the above technical solution, the anesthesia machine has a circuit simulation model of the lungs when leakage occurs, including: a gas source, inherent air resistance, air capacity, and simulated air resistance R; the gas source represents the air pressure after inflation; the inherent air resistance represents the inherent air resistance of the lungs; the air capacity represents compliance; and the simulated air resistance R is connected in parallel with the air capacity.

[0016] As an improvement to the above technical solution, the circuit simulation model of the lungs when the anesthesia machine has a leak is also connected to the atmosphere, and the atmosphere is regarded as ground.

[0017] As one improvement to the above technical solution, the method of establishing an equation relating simulated air resistance R and compliance during inflation based on a circuit simulation model of the lungs when leakage occurs in the anesthesia machine, and calculating the leakage amount and compliance, specifically includes:

[0018] After the ventilation circuit of the anesthesia machine is connected, close the proportional valve and the expiratory valve;

[0019] Turn the flow meter to the maximum flow rate f and inflate the lungs;

[0020] During inflation, the pressure difference ΔP(t) and inflation time t are recorded. Based on the circuit simulation model of the lung when there is leakage in the anesthesia machine, the equation relationship between simulated air resistance R and compliance is listed.

[0021] Record the times t1 and t2 when the air pressure reaches P1 and P2 respectively;

[0022] Substituting t1 and t2 into the equation relating simulated air resistance R and compliance, the leakage rate and compliance can be obtained.

[0023] As one improvement to the above technical solution, the equation relating the simulated air resistance R to compliance is specifically as follows:

[0024]

[0025] Where C represents compliance.

[0026] As one improvement to the above technical solution, substituting t1 and t2 into the equation relating simulated air resistance R and compliance to obtain the leakage amount and the compliance between P1 and P2 specifically includes:

[0027] Substituting t1 and t2 into the equation relating simulated air resistance R and compliance, the compliance C between P1 and P2 is obtained.

[0028] Based on the equation relating simulated air resistance R and compliance, and combined with the calculated compliance C, the simulated air resistance R is obtained.

[0029] The leakage amount is obtained by calculating the relationship between the simulated air resistance R and the leakage amount.

[0030] As one improvement to the above technical solution, the formula for calculating the compliance C is:

[0031]

[0032] Among them, variables variable ΔP(t1) represents the pressure difference that increases during inflation time T1; ΔP(t2) represents the pressure difference that increases during inflation time t2.

[0033] As one improvement to the above technical solution, the formula for calculating the simulated air resistance R is:

[0034]

[0035] As one of the improvements to the above technical solution, the leakage amount F l The formula for calculation is:

[0036]

[0037] The advantages of this invention compared to the prior art are:

[0038] 1. This invention expresses the leakage amount as the flow velocity of gas through a simulated air resistance R to the atmosphere at a certain air pressure, and establishes a circuit simulation model of the lungs when there is leakage in the anesthesia machine, so as to make the measurement, analysis and calculation process more specific and simple.

[0039] 2. After the circuit simulation model is established, the relationship between leakage, simulated resistance and compliance is clear and easy to understand, which enables the method of the present invention to simultaneously detect leakage and compliance.

[0040] 3. The detection process of this invention achieves dynamic detection, the required data is easy to monitor, it saves detection time, and reduces the error when calculating leakage and compliance. Attached Figure Description

[0041] Figure 1 A simulation model of the lungs;

[0042] Figure 2 This is a simulation model of the lungs in the event of a leak. Detailed Implementation

[0043] The technical solutions provided by the present invention will be further illustrated below with reference to the embodiments.

[0044] Let the compliance to be tested be C, the simulated air resistance be R, the inherent system compliance be C1, and the leakage to be tested be F.l The leakage rate can be expressed as the flow velocity of gas when it flows through an air block to the atmosphere under a certain pressure. This air block is set as the simulated air block R.

[0045] Based on the principles of lung ventilation, there may be...

[0046]

[0047] C represents compliance, V represents volume, and P represents pressure. A lung simulation model is shown below. Figure 1 When a leak occurs, the lung simulation model is as follows: Figure 2 .

[0048] Leakage compliance testing process:

[0049] 1. After the pipeline is connected, close the proportional valve and the exhalation valve.

[0050] 2. Set the flow meter to a flow rate f of 10 L / min. This is the maximum flow rate that the flow meter can normally achieve, ensuring a rapid inflation process.

[0051] 3. During the inflation process, record the pressure difference ΔP and the running time t.

[0052] 4. ΔP(t) represents the pressure difference at time t, according to... Figure 2 The model shows that

[0053]

[0054] 5. Record the times when the inflation reaches 30cmH2O and 50cmH2O, respectively, as t1 and t2. According to the standard compliance process, the compliance between 30 and 50cmH2O needs to be measured, and replacements should be made accordingly.

[0055]

[0056]

[0057] We can obtain:

[0058]

[0059]

[0060] The compliance can be calculated as follows:

[0061]

[0062] 6. Calculate the simulated air resistance as follows:

[0063]

[0064] 7. According to the standard requirements, the leakage rate is the leakage value under a water pressure of 30 cm, so the calculated leakage rate is...

[0065]

[0066] As can be seen from the above detailed description of the present invention, the method of the present invention achieves simultaneous detection of leakage and compliance, and has a short detection time and small error in calculating leakage and compliance.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for simultaneously detecting leakage and compliance in an anesthesia machine, the method comprising: The leakage is expressed as the amount of gas passing through simulated air resistance at a certain pressure. R The velocity of the flow when it reaches the atmosphere; Establish a circuit simulation model of the lungs when there is a leak in the anesthesia machine; Based on the circuit simulation model of the lungs when there is a leak in the anesthesia machine, the simulated air resistance during inflation is listed. R The leakage rate and compliance are obtained from the equation relating compliance and leakage resistance; the simulated air resistance... R The equation relating to compliance is as follows: in, C Indicates compliance, f For flow meter flow rate, P ( t )and t These are the pressure difference during inflation and the inflation time, respectively.

2. The method for simultaneously detecting leakage and compliance in an anesthesia machine according to claim 1, characterized in that, The anesthesia machine includes a circuit simulation model of the lungs in case of leakage, comprising: gas source, inherent air resistance, air capacity, and simulated air resistance. R The air source represents the air pressure after inflation; the inherent air resistance represents the inherent air resistance of the lungs; the air capacity represents compliance; the simulated air resistance... R It is connected in parallel with the gas container.

3. The method for simultaneously detecting leakage and compliance in an anesthesia machine according to claim 2, characterized in that, The circuit simulation model of the lungs in the anesthesia machine when there is a leak is also connected to the atmosphere, and the atmosphere is regarded as ground.

4. The method for simultaneously detecting leakage and compliance in an anesthesia machine according to claim 1, characterized in that, Based on the circuit simulation model of the lungs when there is a leak in the anesthesia machine, the simulated air resistance during inflation is listed. R By establishing an equation relating compliance and leakage rate, we can determine the leakage rate and compliance, specifically including: After the ventilation circuit of the anesthesia machine is connected, close the proportional valve and the expiratory valve; Turn on flow meter flow rate f Inflate the lungs to the maximum flow rate; During inflation, record the pressure difference as it rises. P ( t ) and inflation time t Based on the circuit simulation model of the lungs when there is a leak in the anesthesia machine, simulated air resistance is listed. R The equation relating compliance; Record the air pressure reaching each P 1 and P 2 times t 1 and t 2; Will t 1 and t 2. Substitute into simulated air resistance R From the equation relating compliance and leakage, we can obtain the leakage amount and compliance.

5. The method for simultaneously detecting leakage and compliance in an anesthesia machine according to claim 4, characterized in that, The t 1 and t 2. Substitute into simulated air resistance R From the equation relating compliance and leakage, we can obtain the leakage amount and P 1 to P The compatibility between 2 specifically includes: Will t 1 and t 2. Substitute into simulated air resistance R From the equation relating compliance, we obtain P 1 to P Compliance between 2 C ; Based on simulated air resistance R The equation relating compliance and adaptability, combined with the obtained compliance... C To obtain simulated air resistance R ; Based on simulated air resistance R The leakage amount is obtained by calculating the relationship between the leakage amount and the leakage amount.

6. The method for simultaneously detecting leakage and compliance in an anesthesia machine according to claim 5, characterized in that, The compliance C The formula for calculation is: Among them, variables ;variable ; Indicates inflation time The pressure difference increases over time; Indicates inflation time The pressure difference increases over time.

7. The method for simultaneously detecting leakage and compliance in an anesthesia machine according to claim 6, characterized in that, The simulated air resistance R The formula for calculation is: 。 8. The method for simultaneously detecting leakage and compliance in an anesthesia machine according to claim 7, characterized in that, The amount of leakage The formula for calculation is: 。

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