Method for detecting using amount of soda lime and anaesthesia machine

Abstract

The invention discloses a soda lime dosage detection method and an anaesthesia machine. The accuracy of soda lime dosage detection can be improved. The method comprises the steps that at least one of the carbon dioxide inhalation concentration of inhalation gas of a patient end and the carbon dioxide exhalation concentration of exhalation gas of the patient end is obtained; and according to at least one of the carbon dioxide inhalation concentration and the carbon dioxide exhalation concentration, determining the residual dosage condition of the soda lime in the carbon dioxide absorption device.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices. In particular, it relates to a method for detecting the dosage of soda lime and an anesthesia machine. Background Art

[0002] At present, in order to prevent carbon dioxide exhaled by patients from accumulating in the breathing circuit, anesthesia machines usually use soda lime to remove carbon dioxide in the inhaled gas. In order to timely understand the consumption of soda lime and replace it, currently, a color-changing indicator can be added to the soda lime, and it is judged whether the soda lime needs to be replaced according to the color change of the soda lime in the carbon dioxide absorption canister. Or, the operator is reminded to replace the soda lime at fixed time intervals. Both of the above methods have large errors in estimating the consumption of soda lime, thus reducing the accuracy of detecting the dosage of soda lime. Summary of the Invention

[0003] An embodiment of the present invention provides a method for detecting the dosage of soda lime and an anesthesia machine, which can improve the accuracy of detecting the dosage of soda lime.

[0004] The technical solution of the present invention is realized as follows:

[0005] In a first aspect, the present invention provides a method for detecting the dosage of soda lime, including:

[0006] Obtaining at least one of the carbon dioxide inhalation concentration of the inhaled gas at the patient end and the carbon dioxide exhalation concentration of the exhaled gas at the patient end;

[0007] Determining the remaining dosage situation of the soda lime in the carbon dioxide absorption device according to at least one of the carbon dioxide inhalation concentration and the carbon dioxide exhalation concentration.

[0008] In a second aspect, an embodiment of the present invention provides an anesthesia machine, including: a ventilation device, a carbon dioxide absorption device, a gas detection module, a flow detection module, and a control module; the ventilation device is connected to the patient end through a breathing circuit; the carbon dioxide absorption device is arranged on the breathing circuit; the carbon dioxide absorption device is loaded with soda lime; the sampling point of the gas detection module is arranged on the connection passage between the breathing circuit and the patient end; the flow detection module is connected to a gas supply device, and the gas supply device is used to provide fresh gas to the patient end through the breathing circuit; the fresh gas does not contain carbon dioxide; the inhaled gas at the patient end includes: the fresh gas and the re-inhaled gas formed after the exhaled gas at the patient end passes through the carbon dioxide absorption device; wherein,

[0009] The ventilation device is used to provide positive pressure ventilation to the patient end;

[0010] The gas detection module is used to detect at least one of the carbon dioxide inhalation concentration of the inhaled gas at the patient end and the carbon dioxide exhalation concentration of the exhaled gas at the patient end;

[0011] The control module is used to execute the sodium lime dosage detection method provided by the embodiments of the present application.

[0012] The present invention provides a sodium lime dosage detection method and an anesthesia machine. By at least one of the carbon dioxide inhalation concentration of the inhaled gas at the patient end and the carbon dioxide exhalation concentration of the exhaled gas at the patient end, the dosage of sodium lime in the carbon dioxide absorption device is determined. Since the carbon dioxide inhalation concentration of the inhaled gas at the patient end can directly reflect the carbon dioxide content in the inhaled gas after being absorbed by sodium lime, and the carbon dioxide exhalation concentration of the exhaled gas at the patient end can reflect the carbon dioxide content in the exhaled gas of the patient, which is equivalent to the carbon dioxide that needs to be absorbed by sodium lime; in this way, by detecting the carbon dioxide at the patient end, the consumption rate of sodium lime can be judged, and the dosage conditions such as whether the sodium lime is exhausted can be determined, thereby improving the accuracy of sodium lime dosage detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic flowchart of a sodium lime dosage detection method provided by an embodiment of the present invention Figure 1 ;

[0014] Figure 2 It is a schematic flowchart of a sodium lime dosage detection method provided by an embodiment of the present invention Figure 2 ;

[0015] Figure 3 It is a schematic flowchart of a sodium lime dosage detection method provided by an embodiment of the present invention Figure 3 ;

[0016] Figure 4 It is a schematic flowchart of a sodium lime dosage detection method provided by an embodiment of the present invention Figure 4 ;

[0017] Figure 5 It is a schematic flowchart of a sodium lime dosage detection method provided by an embodiment of the present invention Figure 5 ;

[0018] Figure 6 It is a schematic flowchart of a sodium lime dosage detection method provided by an embodiment of the present invention Figure 6 ;

[0019] Figure 7 It is a schematic flowchart of a sodium lime dosage detection method provided by an embodiment of the present invention Figure 7 ;

[0020] Figure 8Flow schematic of a method for detecting the dosage of soda lime provided by an embodiment of the present invention Figure 8 ;

[0021] Figure 9 Flow schematic of a method for detecting the dosage of soda lime provided by an embodiment of the present invention Figure 9 ;

[0022] Figure 10 Structural schematic of an anesthesia machine provided by an embodiment of the present invention Figure 1 ;

[0023] Figure 11 Structural schematic of an anesthesia machine provided by an embodiment of the present invention Figure 2 ;

[0024] Figure 12 Structural schematic of an anesthesia machine provided by an embodiment of the present invention Figure 3 ;

[0025] Figure 13 Structural schematic of an anesthesia machine provided by an embodiment of the present invention Figure 4 。 Detailed implementation manners

[0026] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. The described embodiments should not be regarded as limitations on the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0027] In the following description, "some embodiments" are involved, which describe a subset of all possible embodiments. However, it can be understood that "some embodiments" can be the same subset or different subsets of all possible embodiments, and can be combined with each other without conflict.

[0028] In the following description, the terms "first\second\third" are only used to distinguish similar objects and do not represent a specific order for the objects. It can be understood that "first\second\third" can be interchanged with a specific order or sequence when allowed, so that the embodiments of the present invention described here can be implemented in an order other than that illustrated or described here.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs. The terms used herein are only for the purpose of describing the embodiments of the present invention and are not intended to limit the present invention.

[0030] At present, in order to reduce the consumption of inhaled anesthetic drugs, anesthetic machines adopt a rebreathing circuit structure to recycle the patient's exhaled gas. To prevent the accumulation of carbon dioxide (CO2) exhaled by the patient in the circuit, a CO2 absorbent is needed to remove the CO2 in the inhaled gas. A common CO2 absorbent is soda lime, which can absorb CO2 and release water and heat at the same time. To facilitate anesthesiologists to judge the consumption of soda lime, a color-changing indicator is added to the soda lime to indicate the change in pH value. When the soda lime absorbs CO2, it will change color. Anesthesiologists can judge whether to replace the soda lime according to the color change of the soda lime in the absorption canister. However, since the reaction of soda lime absorbing CO2 is not uniform, the method of judging the amount of soda lime by color usually has a large error and is prone to waste of soda lime.

[0031] At present, there are also some methods to replace soda lime at fixed intervals. The basis of this method is that the amount of CO2 that a fixed amount of soda lime can absorb is also fixed. For example, considering the actual absorption efficiency, about every 100 g of soda lime can absorb about 10 - 20 liters (L) of CO2, and the rate of CO2 exhaled by adults also varies little, about 200 milliliters per minute (ml / min). In this way, anesthesiologists can estimate the time interval for replacing soda lime each time according to the capacity of the absorption canister of the anesthetic machine to load soda lime. Or, some anesthetic machines also provide a timer function to remind doctors to replace soda lime. But this method of estimation is more rough.

[0032] In summary, the current methods for detecting the amount of soda lime are relatively rough, which reduces the accuracy of detecting the amount of soda lime used.

[0033] The embodiments of the present invention provide a method for detecting the amount of soda lime and an anesthetic machine, which can improve the accuracy of detecting the amount of soda lime used. Next, refer to Figure 1 , and describe the method for detecting the amount of soda lime provided by the embodiments of the present invention.

[0034] S101. Obtain at least one of the carbon dioxide inhalation concentration of the inhaled gas at the patient end and the carbon dioxide exhalation concentration of the exhaled gas at the patient end.

[0035] The method for detecting the amount of soda lime used in the embodiments of the present invention can be applied to an anesthesia machine. Specifically, it can be applied to a control module in the anesthesia machine (such as the processor of the anesthesia machine), or to a device connected to the anesthesia machine, such as a monitor connected to the anesthesia machine, a central control computer in the operating room connected to the anesthesia machine, or a computer of the anesthesia machine central station connected to the anesthesia machine, etc. Specifically, it is selected according to the actual situation, and the embodiments of the present invention do not make any limitations. Through the above devices, using the method for detecting the amount of soda lime used provided by the embodiments of the present invention, the remaining amount of soda lime in the carbon dioxide absorption device loaded with soda lime on the anesthesia machine can be detected. In some embodiments, the carbon dioxide absorption device may include a soda lime canister, or may include other forms of absorption devices for accommodating soda lime, which is specifically selected according to the actual situation, and the embodiments of the present invention do not make any limitations.

[0036] In the embodiments of the present invention, the carbon dioxide absorption device is arranged on the breathing circuit connected to the patient end. The exhaled gas at the patient end passes through the breathing circuit and then through the carbon dioxide absorption device to become the re-inhaled gas, and the re-inhaled gas is then mixed with the fresh gas entering the breathing circuit and flows into the patient end for the patient to inhale. That is to say, the inhaled gas at the patient end includes: fresh gas and re-inhaled gas. Among them, the fresh gas does not contain carbon dioxide.

[0037] In the embodiments of the present invention, at least one of the carbon dioxide inhalation concentration in the inhaled gas at the patient end and the carbon dioxide exhalation concentration in the exhaled gas at the patient end can be detected. Exemplarily, a gas concentration detection module can be arranged on the breathing circuit to detect the carbon dioxide inhalation concentration and the exhalation concentration, so as to further determine the remaining amount of soda lime.

[0038] S102. Determine the remaining amount of soda lime in the carbon dioxide absorption device according to at least one of the carbon dioxide inhalation concentration and the carbon dioxide exhalation concentration.

[0039] In the embodiments of the present application, since the carbon dioxide in the inhaled gas at the patient end is brought by the re-inhaled gas, the carbon dioxide inhalation concentration can directly reflect the carbon dioxide content in the inhaled gas after being absorbed by the soda lime. And the carbon dioxide exhalation concentration can reflect the carbon dioxide content in the exhaled gas at the patient end, and can also be considered as the carbon dioxide content that needs to be absorbed by the soda lime. By monitoring at least one of the carbon dioxide inhalation concentration and the carbon dioxide exhalation concentration at the patient end, it can be judged how much of the carbon dioxide exhaled by the patient is absorbed by the soda lime, so as to determine the remaining amount of soda lime.

[0040] In some embodiments, S102 can be implemented in the following several ways.

[0041] Method 1: The remaining amount of soda lime in the carbon dioxide absorption device can be determined by comparing the carbon dioxide inhalation concentration with a preset inhalation concentration threshold. As follows: When the carbon dioxide inhalation concentration is greater than or equal to the preset inhalation concentration threshold, it is determined that the remaining amount of soda lime is less than the preset amount threshold.

[0042] When the soda lime is about to be exhausted, the effective components contacted by the inhaled gas during repeated inhalation also decrease, the absorption effect of the soda lime gradually deteriorates, and the CO2 content in the inhaled gas of the patient will gradually increase. Therefore, by monitoring the carbon dioxide inhalation concentration of the inhaled gas at the patient end, when the carbon dioxide inhalation concentration is greater than or equal to the preset inhalation concentration threshold, it is determined that the remaining amount of soda lime is less than the preset amount threshold, which is equivalent to the soda lime being about to be exhausted.

[0043] Exemplarily, the remaining amount can be represented by the remaining available time. When it is detected that the inhaled CO2 concentration reaches 0.3 vol% or 2 mmHg (equivalent to the preset inhalation concentration threshold), it can be determined that the remaining available time of the soda lime is less than 30 minutes (equivalent to the preset amount threshold), indicating that the soda lime will be completely exhausted within 30 minutes, that is, it is determined that the remaining amount of soda lime is less than the preset amount threshold.

[0044] Method 2: The estimated carbon dioxide concentration in the gas flowing into the carbon dioxide absorption device can be estimated through the carbon dioxide exhalation concentration. According to the estimated carbon dioxide concentration and the flow rate of the gas flowing into the carbon dioxide absorption device, that is, by combining the concentration and the flow rate, the amount of carbon dioxide absorbed by the soda lime in the exhaled gas at the patient end can be determined, and then the remaining amount of soda lime can be determined based on the amount of carbon dioxide absorbed. Exemplarily, as Figure 2 shown, it includes S301 - S305, as follows:

[0045] S301: Obtain the preset ventilation volume at the patient end.

[0046] In S301, the breathing circuit at the patient end is usually connected to a ventilation device for providing positive pressure ventilation, such as a ventilator. By obtaining the ventilation volume set on the ventilation device as the preset ventilation volume corresponding to the gas at the patient end. Exemplarily, the preset ventilation volume can include the minute ventilation volume (MV).

[0047] S302: Based on the carbon dioxide exhalation concentration, determine the estimated carbon dioxide concentration of the gas flowing into the carbon dioxide absorption device.

[0048] In S302, the exhaled gas at the patient end contains carbon dioxide, and a part of the exhaled gas at the patient end flows into the carbon dioxide absorption device through the breathing circuit. In some embodiments, such as Figure 3As shown, based on the detected carbon dioxide exhalation concentration of the exhaled gas at the patient end, the estimated carbon dioxide concentration in the gas flowing into the carbon dioxide absorption device can be determined by the method in S3021 as follows:

[0049] S3021. Determine the carbon dioxide exhalation concentration as the estimated carbon dioxide concentration.

[0050] In S3021, it can be directly considered that all the carbon dioxide exhaled by the patient is absorbed by the soda lime, so the detected carbon dioxide exhalation concentration is equal to the estimated carbon dioxide concentration.

[0051] In some embodiments, as Figure 4 shown, the estimated carbon dioxide concentration in the gas flowing into the carbon dioxide absorption device can be determined by the methods in S3022 - S3024. As follows, S3022. Obtain the fresh gas ventilation volume of the fresh gas.

[0052] In S3022, the fresh gas is provided by the gas supply device, and the fresh gas ventilation volume of the fresh gas can be obtained by setting a gas flow detection module at the gas supply device end.

[0053] S3023. Determine the gas flow rate of the re - inhaled gas according to the difference between the preset ventilation volume and the fresh gas ventilation volume.

[0054] In S3023, as described above, the inhaled gas at the patient end includes: the fresh gas provided to the patient end and the re - inhaled gas formed after the exhaled gas at the patient end passes through the carbon dioxide absorption device. The preset ventilation volume is the ventilation volume of the gas that the patient can obtain set on the ventilation device, which is equivalent to the total ventilation volume of the fresh gas and the re - inhaled gas. Therefore, the ventilation volume of the re - inhaled gas, that is, the gas flow rate of the re - inhaled gas, can be determined according to the difference between the preset ventilation volume and the fresh gas ventilation volume.

[0055] S3024. Determine the estimated carbon dioxide concentration according to the gas flow rate of the re - inhaled gas and the carbon dioxide exhalation concentration.

[0056] In S3024, since the re - inhaled gas is formed by the exhaled gas at the patient end entering the breathing circuit and passing through the carbon dioxide absorption device. In this way, the proportion of the gas flow rate of the gas that is recycled from the exhaled gas and flows into the carbon dioxide absorption device can be calculated according to the gas flow rate of the re - inhaled gas, and then, in combination with this gas flow rate proportion and the carbon dioxide exhalation concentration in the exhaled gas, the estimated carbon dioxide concentration in the gas flowing into the carbon dioxide absorption device can be determined.

[0057] In some embodiments, the ratio of the gas flow rate of the re-inhaled gas to the preset ventilation volume can be determined; based on the product of the ratio and the exhaled carbon dioxide concentration, the estimated carbon dioxide concentration can be determined. Exemplarily, as shown in formula (1), it is as follows:

[0058]

[0059] Wherein, MV is the preset ventilation volume, representing the flow rate of the inhaled gas or exhaled gas at the patient end per unit time; FGF is the fresh gas ventilation volume; MV - FGF is the gas flow rate of the re-inhaled gas; and EtCO2 is the exhaled carbon dioxide concentration. is the ratio of the gas flow rate of the re-inhaled gas to the preset ventilation volume, representing the proportion of the gas flow rate that is reused and flows into the carbon dioxide absorption device in the exhaled gas at the patient end. Therefore, the product of the proportion of the gas flow rate that is reused and flows into the carbon dioxide absorption device in the exhaled gas and the exhaled carbon dioxide concentration in the exhaled gas can be determined as the estimated carbon dioxide concentration C of the gas flowing into the carbon dioxide absorption device sorb .

[0060] S303. Based on the preset ventilation volume, determine the estimated flow rate of the gas flowing into the carbon dioxide absorption device.

[0061] For S303, in some embodiments, it can be considered that the gas flow velocity through the carbon dioxide absorption device is equal to the preset ventilation volume obtained by the patient, such as the minute ventilation volume MV. Therefore, the preset ventilation volume can be directly determined as the estimated flow rate.

[0062] For S303, in some other embodiments, considering that when the exhaled gas at the patient end passes through the carbon dioxide absorption device, the carbon dioxide in the exhaled gas is absorbed and reduced, which will affect the gas flow velocity. Therefore, the estimated flow rate of the gas flowing into the carbon dioxide absorption device can also be determined by combining the exhaled carbon dioxide concentration and the preset ventilation volume. Exemplarily, as Figure 5 shown, including S3031 - S3033, as follows:

[0063] S3031. Obtain the fresh gas ventilation volume of the fresh gas.

[0064] S3032. Determine the gas flow rate of the re-inhaled gas according to the difference between the preset ventilation volume and the fresh gas ventilation volume.

[0065] S3033. Determine the estimated flow rate according to the gas flow rate of the re-inhaled gas and the exhaled carbon dioxide concentration.

[0066] It should be noted that in practical applications, S302 and S303 can be executed in any order. The process of determining the gas flow rate of the rebreathing gas in S3031 - S3032 is equivalent to a possible implementation manner S3022 - S3023 in the above S302. Therefore, when S302 or S303 is executed, the gas flow rate of the rebreathing gas that has been determined through another step can also be directly utilized, without performing repeated calculation steps.

[0067] In some embodiments, for S3033, the non - carbon dioxide gas concentration corresponding to the non - carbon dioxide gas in the exhaled gas can be determined according to the exhaled carbon dioxide concentration; the non - carbon dioxide gas includes other gases in the exhaled gas except carbon dioxide. According to the ratio of the gas flow rate of the rebreathing gas to the non - carbon dioxide gas concentration, the estimated flow rate is determined.

[0068] Among them, since the gas flow rate of the rebreathing gas represents the gas flow rate flowing through the carbon dioxide absorption device, and the gas flow rate corresponding to the carbon dioxide in it has been lost when flowing through the carbon dioxide absorption device, therefore, based on the non - carbon dioxide gas concentration, the gas flow rate corresponding to the lost carbon dioxide can be compensated to determine the estimated flow rate of the gas flowing into the carbon dioxide absorption device. Exemplarily, the non - carbon dioxide gas concentration can be represented by (1 - EtCO2), and the estimated flow rate of the gas flowing into the carbon dioxide absorption device can be determined through formula (2) as follows:

[0069]

[0070] In formula (2), MV - FGF is the gas flow rate of the rebreathing gas, and F sorb is the estimated flow rate of the gas flowing into the carbon dioxide absorption device.

[0071] S304. Determine the carbon dioxide absorption amount corresponding to the carbon dioxide absorption device according to the estimated carbon dioxide concentration and the estimated flow rate.

[0072] In the embodiments of the present invention, the estimated flow rate represents the rate of the gas flowing into the carbon dioxide absorption device per unit time, and the estimated carbon dioxide concentration represents the concentration of carbon dioxide in the gas flowing into the carbon dioxide absorption device. Therefore, by accumulating the estimated carbon dioxide concentration and the estimated flow rate in at least one time period, the cumulative value in at least one time period can be determined as the carbon dioxide absorption amount.

[0073] Exemplarily, during the anesthesia process, the carbon dioxide concentration situation and the ventilation situation can be continuously monitored to determine the estimated carbon dioxide concentration and the estimated flow rate in each time period. According to the product of the estimated carbon dioxide concentration and the estimated flow rate, such as F sorb ×C sorb, determine the absorption amount per unit of carbon dioxide absorption unit for each time period, and obtain a cumulative value by accumulating the absorption amounts of carbon dioxide absorption units for at least one time period, which is used as the carbon dioxide absorption amount.

[0074] S305. Determine the remaining usage amount of soda lime according to the carbon dioxide absorption amount.

[0075] In S305, the carbon dioxide absorption amount characterizes the absorption of carbon dioxide by soda lime. Exemplarily, it can characterize the absorption rate of soda lime for carbon dioxide per unit time.

[0076] In some embodiments, the remaining usage amount of soda lime can be determined according to the carbon dioxide absorption amount and the absorption amount threshold corresponding to the carbon dioxide absorption device. Exemplarily, when the carbon dioxide absorption amount is greater than or equal to the absorption amount threshold, it is determined that the remaining usage amount of soda lime is less than the preset usage amount threshold, that is, the soda lime is about to be exhausted.

[0077] In some embodiments, the soda lime consumption amount corresponding to the carbon dioxide absorption amount can also be determined according to the preset corresponding relationship between the carbon dioxide absorption amount and the soda lime consumption amount. According to the soda lime consumption amount corresponding to the carbon dioxide absorption amount and the total weight of soda lime in the carbon dioxide absorption device, determine the remaining usage amount of soda lime. Exemplarily, the total weight of soda lime can be determined according to the volume of soda lime loaded in the carbon dioxide absorption device; the total consumption amount of soda lime can be determined according to the carbon dioxide absorption amount; and the remaining usage amount can be determined according to the total consumption amount of soda lime and the total weight of soda lime.

[0078] Exemplarily, when the total consumption amount of soda lime is greater than or equal to the total weight of soda lime, it can be determined that the remaining usage amount of soda lime is less than the preset usage amount threshold, that is, the soda lime is about to be exhausted.

[0079] It should be noted that the above method 2 is a method for determining the estimated carbon dioxide concentration based on the carbon dioxide exhalation concentration, determining the estimated flow rate based on the preset ventilation volume; determining the carbon dioxide absorption amount according to the product of the estimated carbon dioxide concentration and the estimated flow rate, and then determining the remaining usage amount of soda lime according to the carbon dioxide absorption amount. Among them, determining the estimated carbon dioxide concentration based on the carbon dioxide exhalation concentration can be achieved by the method in S3021, or by the method in S3022 - S3024; the method for determining the estimated flow rate based on the preset ventilation volume can directly determine the preset ventilation volume as the estimated flow rate, or by the method in S3031 - S3033. In practical applications, different methods for determining the estimated carbon dioxide concentration and the estimated flow rate can be freely combined, and the embodiments of the present invention do not make limitations.

[0080] Exemplarily, a preset ventilation volume at the patient end can be obtained, the preset ventilation volume can be used as the estimated flow rate, and the carbon dioxide exhalation concentration can be used as the estimated carbon dioxide concentration. Thus, according to the preset ventilation volume and the carbon dioxide exhalation concentration, the carbon dioxide absorption amount corresponding to the carbon dioxide absorption device can be determined, and further, according to the carbon dioxide absorption amount, the remaining amount of soda lime can be determined.

[0081] Method 3: Combine Method 1 and Method 2 to determine the remaining amount of soda lime in the carbon dioxide absorption device. As Figure 3 shown, as follows:

[0082] S401: Obtain the preset ventilation volume at the patient end.

[0083] S402: Based on the carbon dioxide exhalation concentration, determine the estimated carbon dioxide concentration of the gas flowing into the carbon dioxide absorption device.

[0084] S403: Based on the preset ventilation volume, determine the estimated flow rate of the gas flowing into the carbon dioxide absorption device.

[0085] S404: According to the estimated carbon dioxide concentration and the estimated flow rate, determine the carbon dioxide absorption amount corresponding to the carbon dioxide absorption device.

[0086] Here, S401 - S404 is equivalent to the process of S301 - S304 in Method 2 above, which will not be elaborated here

[0087] S405: In the case where the carbon dioxide absorption amount is greater than or equal to the absorption amount threshold corresponding to the carbon dioxide absorption device, or, in the case where the soda lime consumption corresponding to the carbon dioxide absorption amount is greater than or equal to the total weight of the soda lime in the carbon dioxide absorption device, determine whether the carbon dioxide inhalation concentration is greater than or equal to the preset inhalation concentration threshold.

[0088] In S405, in the case where it is determined by the method of Method 2 that the carbon dioxide absorption amount is greater than or equal to the absorption amount threshold corresponding to the carbon dioxide absorption device, or, in the case where the total soda lime consumption corresponding to the carbon dioxide absorption amount is greater than or equal to the total weight of the soda lime in the carbon dioxide absorption device, the method of Method 1 can be further used to determine whether the carbon dioxide inhalation concentration is greater than or equal to the preset inhalation concentration threshold.

[0089] S406: In the case where the carbon dioxide inhalation concentration is greater than or equal to the preset inhalation concentration threshold, determine that the remaining amount of soda lime is less than the preset amount threshold.

[0090] In S406, when it is determined through the process of S405 that the carbon dioxide inhalation concentration is greater than or equal to the preset inhalation concentration threshold, it indicates that the remaining amount of soda lime determined by the two methods of method one and method two is consistent, thereby determining that the remaining amount of soda lime is less than the preset amount threshold. In this way, by combining the two methods for detection, the accuracy of soda lime usage detection can be further improved.

[0091] In some embodiments, when it is determined through the above method in the embodiments of the present invention that the remaining amount of soda lime is less than the preset amount threshold, an alarm or prompt can be given to prompt the operator to replace the carbon dioxide absorption device as soon as possible.

[0092] It can be understood that the embodiments of the present invention determine the usage of soda lime in the carbon dioxide absorption device through at least one of the carbon dioxide inhalation concentration of the inhaled gas at the patient end and the carbon dioxide exhalation concentration of the exhaled gas at the patient end. Since the carbon dioxide inhalation concentration of the inhaled gas at the patient end can directly reflect the carbon dioxide content in the inhaled gas after being absorbed by the soda lime, and the carbon dioxide exhalation concentration of the exhaled gas at the patient end can reflect the carbon dioxide content in the exhaled gas of the patient, which is equivalent to the carbon dioxide that needs to be absorbed by the soda lime; in this way, by detecting the carbon dioxide at the patient end, the consumption rate of the soda lime can be judged, and the usage conditions such as whether the soda lime is exhausted can be determined, thereby improving the accuracy of soda lime usage detection.

[0093] In some embodiments, for the process of determining the remaining amount of soda lime according to the carbon dioxide absorption amount and the absorption amount threshold of the soda lime in S305 or S405 above, it can be further as Figure 5 shown, and is realized by executing the process of S701 - S702 as follows:

[0094] S701. Determine or update the absorption amount threshold of the soda lime loaded in the carbon dioxide absorption device.

[0095] In practical applications, due to the influence of factors such as the component ratio in the soda lime, the gas path structure of the absorption tank, and the loading tightness on the absorption capacity of the soda lime, the absorption capacity of the soda lime cannot fully reach the theoretical value of the absorption capacity. Therefore, the actual consumption of the soda lime is always less than its theoretical absorption capacity. In some embodiments, as Figure 6 shown, S701 can be realized by executing the process of S7011 - S7013 as follows:

[0096] S7011. According to the volume of the soda lime loaded in the carbon dioxide absorption device, determine the total weight of the soda lime, and based on the total weight of the soda lime, determine the current calibrated absorption amount threshold of the carbon dioxide absorption device.

[0097] In S7011, the total weight of soda lime can be determined by combining the known density of soda lime and based on the volume of soda lime loaded in the carbon dioxide absorption device. Further, according to the corresponding relationship between the preset unit weight of soda lime and the amount of carbon dioxide absorbed, the calibrated absorption amount threshold corresponding to the total weight of soda lime is determined.

[0098] S7012. Determine or update the preset coefficient for soda lime to absorb carbon dioxide.

[0099] In S7012, the calibrated absorption amount threshold can be used as the theoretical value, and the theoretical value is adjusted by the preset coefficient to determine the actual absorption amount. Exemplarily, the preset coefficient can include the calibration value provided by the soda lime supplier or the equipment supplier, or can also include an empirical value. In some embodiments, the preset coefficient can be determined by receiving an operation instruction on a preset interface. The preset interface can be a setting interface for the preset coefficient, and by inputting the above calibration value or empirical value on the preset interface, a corresponding operation instruction is generated.

[0100] In some embodiments, it is also possible to record at least one historical carbon dioxide absorption amount corresponding to when at least one carbon dioxide absorption device is replaced; determine the average value of the historical carbon dioxide absorption amounts according to the at least one historical carbon dioxide absorption amount; and determine or update the preset coefficient according to the ratio of the average value of the historical carbon dioxide absorption amounts to the calibrated absorption amount threshold.

[0101] Exemplarily, during the use of an anesthesia machine, each time the soda lime in the soda lime absorption canister is exhausted and replaced, the carbon dioxide absorption amount of the replaced soda lime absorption canister is recorded as a historical carbon dioxide absorption amount. In this way, by recording at least one carbon dioxide absorption amount and performing an average calculation, the average value of the historical carbon dioxide absorption amounts is determined. The average value of the historical carbon dioxide absorption amounts represents the average value of the actual absorption capacity of the carbon dioxide absorption device. According to the ratio of the average value of the historical carbon dioxide absorption amounts to the calibrated absorption amount threshold, the preset coefficient can be determined. Among them, the preset coefficient is less than 1 and greater than 0.

[0102] S7013. Determine or update the absorption amount threshold according to the calibrated absorption amount threshold and the preset coefficient.

[0103] In some embodiments, the product of the calibrated absorption amount threshold and the preset coefficient can be determined as the absorption amount threshold or the current absorption amount threshold is updated. Or, it is also possible to further adjust the floating value based on the product of the calibrated absorption amount threshold and the preset coefficient to determine or update the absorption amount threshold. The specific selection is made according to the actual situation, and the embodiments of the present invention do not make any limitations.

[0104] In some embodiments, as Figure 9 shown, S701 can also be implemented by executing the process of S7014 - S7016, as follows:

[0105] S7014. Record at least one historical carbon dioxide absorption amount corresponding to when at least one carbon dioxide absorption device is replaced.

[0106] S7015. Determine the average value of the historical carbon dioxide absorption amount based on at least one historical carbon dioxide absorption amount.

[0107] The processes of S7014 - S7015 are the same as the processes described in the aforementioned S7012 for determining the preset coefficient and determining the average value of the historical carbon dioxide absorption amount, and will not be elaborated here.

[0108] S7016. Determine or update the absorption amount threshold based on the average value of the historical carbon dioxide absorption amount.

[0109] In S7016, the absorption amount threshold can be directly determined or updated based on the average value of the historical carbon dioxide absorption amount. That is to say, the absorption amount threshold can be updated by accumulating historical absorption data; or the preset coefficient can be updated, and the absorption amount threshold can be updated through the preset coefficient.

[0110] S702. Determine the remaining usage situation based on the carbon dioxide absorption amount and the absorption amount threshold.

[0111] In S702, the carbon dioxide absorption amount determined through the relevant processes in Method 1, Method 2, or Method 3 can be compared with the absorption amount threshold determined through S7011 - S7013 or S7014 - S7016 to determine the remaining usage situation.

[0112] In some embodiments, when the carbon dioxide absorption amount is greater than or equal to the absorption amount threshold, it is determined that the remaining amount of soda lime is less than the preset usage threshold.

[0113] It can be understood that in the embodiments of the present invention, the absorption amount threshold can be dynamically updated based on historical data accumulation, and then the remaining usage situation of soda lime can be determined based on the absorption amount threshold, further improving the accuracy of soda lime usage detection.

[0114] Next, taking the detection method of soda lime usage in the embodiments of the present invention applied to an anesthesia machine as an example, an anesthesia machine provided by the embodiments of the present invention will be introduced.

[0115] Such as Figure 10As shown in the figure, the anesthesia machine provided by the embodiment of the present invention may include: a ventilation device 80, a carbon dioxide absorption device 81, a gas detection module 82, a flow detection module 83, and a control module 84. Among them, the ventilation device 80 is connected to the patient end through a breathing circuit 85; the carbon dioxide absorption device 81 is arranged on the breathing circuit 85; soda lime is loaded in the carbon dioxide absorption device 81; the sampling point of the gas detection module 82 is arranged on the connection path between the breathing circuit 85 and the patient end; the flow detection module 83 is connected to a gas supply device 86, and the gas supply device 86 is used to supply fresh gas to the patient end through the breathing circuit 85; the fresh gas does not contain carbon dioxide; the inhaled gas at the patient end includes: fresh gas and the recycled inhaled gas formed after the exhaled gas at the patient end passes through the carbon dioxide absorption device 81; among them,

[0116] The ventilation device 80 is used to provide positive pressure ventilation to the patient end;

[0117] The gas detection module 82 is used to detect at least one of the carbon dioxide inhalation concentration of the inhaled gas at the patient end and the carbon dioxide exhalation concentration of the exhaled gas at the patient end;

[0118] The control module 84 is connected to the gas detection module 82 for data, and is used to determine the remaining usage amount of the soda lime in the carbon dioxide absorption device according to at least one of the carbon dioxide inhalation concentration and the carbon dioxide exhalation concentration by obtaining at least one of the carbon dioxide inhalation concentration of the inhaled gas at the patient end and the carbon dioxide exhalation concentration of the exhaled gas at the patient end from the gas detection module 82.

[0119] In some embodiments, the anesthesia machine may also be as Figure 11 shown, including a bellows (or volume reflector / reservoir bag, etc.) 91 between the ventilation device 80 and the breathing circuit 85, and an evaporator 92 connected between the flow detection module 83 and the breathing circuit 85 for providing anesthetic, etc., which is specifically selected according to the actual situation, and the embodiments of the present invention do not make limitations.

[0120] In some embodiments, based on Figure 10 the anesthesia machine shown, the control module 84 is further used to determine that the remaining usage amount of the soda lime is less than a preset usage threshold when the carbon dioxide inhalation concentration is greater than or equal to a preset inhalation concentration threshold.

[0121] In some embodiments, as Figure 12 shown, the control module 84 is also connected to the ventilation device 80 for data, and is used to obtain the preset ventilation volume set on the ventilation device 80 and / or the fresh gas ventilation volume detected by the flow detection module.

[0122] In some embodiments, the control module 84 is further configured to obtain a preset ventilation volume corresponding to the inhaled gas at the patient end; determine an estimated carbon dioxide concentration of the gas flowing into the carbon dioxide absorption device based on the exhaled carbon dioxide concentration; determine an estimated flow rate of the gas flowing into the carbon dioxide absorption device based on the preset ventilation volume; determine a carbon dioxide absorption amount corresponding to the carbon dioxide absorption device according to the estimated carbon dioxide concentration and the estimated flow rate; and determine the remaining usage amount of the soda lime according to the carbon dioxide absorption amount.

[0123] In some embodiments, the control module 84 is further configured to determine the exhaled carbon dioxide concentration as the estimated carbon dioxide concentration.

[0124] In some embodiments, the inhaled gas at the patient end includes: fresh gas provided to the patient end, and re-inhaled gas formed after the exhaled gas at the patient end passes through the carbon dioxide absorption device 81; the fresh gas does not contain carbon dioxide; as Figure 13 shown, the control module 84 is also connected to the flow rate detection module 83 for data connection, and is used for the fresh gas ventilation volume detected by the flow rate detection module.

[0125] The control module 84 is further configured to obtain the fresh gas ventilation volume of the fresh gas;

[0126] Determine the gas flow rate of the re-inhaled gas according to the difference between the preset ventilation volume and the fresh gas ventilation volume;

[0127] Determine the estimated carbon dioxide concentration according to the gas flow rate of the re-inhaled gas and the exhaled carbon dioxide concentration.

[0128] In some embodiments, the control module 84 is further configured to determine the ratio of the gas flow rate to the preset ventilation volume; and determine the estimated carbon dioxide concentration according to the product of the ratio and the exhaled carbon dioxide concentration.

[0129] In some embodiments, the control module 84 is further configured to determine the preset ventilation volume as the estimated flow rate.

[0130] In some embodiments, the inhaled gas at the patient end includes: fresh gas provided to the patient end, and re-inhaled gas formed after the exhaled gas at the patient end passes through the carbon dioxide absorption device; the fresh gas does not contain carbon dioxide; the control module 84 is further configured to obtain the fresh gas ventilation volume of the fresh gas; determine the gas flow rate of the re-inhaled gas according to the difference between the preset ventilation volume and the fresh gas ventilation volume; and determine the estimated flow rate according to the gas flow rate of the re-inhaled gas and the exhaled carbon dioxide concentration.

[0131] In some embodiments, the control module 84 is further configured to determine the non-carbon dioxide gas concentration corresponding to the non-carbon dioxide gas in the exhaled gas according to the carbon dioxide exhalation concentration; the non-carbon dioxide gas includes other gases in the exhaled gas except carbon dioxide; and determine the estimated flow rate according to the ratio of the gas flow rate of the re-inhaled gas to the non-carbon dioxide gas concentration.

[0132] In some embodiments, the control module 84 is further configured to obtain a preset ventilation volume corresponding to the inhaled gas at the patient end; determine the carbon dioxide absorption amount corresponding to the carbon dioxide absorption device according to the carbon dioxide exhalation concentration and the preset ventilation volume; and determine the remaining usage amount of the soda lime according to the carbon dioxide absorption amount.

[0133] In some embodiments, the control module 84 is further configured to determine the cumulative value within at least one time period by accumulating the estimated carbon dioxide concentration and the estimated flow rate within at least one time period, and use the cumulative value as the carbon dioxide absorption amount.

[0134] In some embodiments, the control module 84 is further configured to determine the cumulative value within at least one time period by accumulating the estimated carbon dioxide concentration and the estimated flow rate within at least one time period, and use the cumulative value as the carbon dioxide absorption amount.

[0135] In some embodiments, the control module 84 is further configured to determine or update the absorption amount threshold of the soda lime loaded in the carbon dioxide absorption device; and determine the remaining usage amount according to the carbon dioxide absorption amount and the absorption amount threshold.

[0136] In some embodiments, the control module 84 is further configured to determine the total weight of the soda lime according to the volume of the soda lime loaded in the carbon dioxide absorption device, and determine the current calibrated absorption amount threshold of the carbon dioxide absorption device based on the total weight of the soda lime; determine or update the preset coefficient for the soda lime to absorb carbon dioxide; and determine or update the absorption amount threshold according to the calibrated absorption amount threshold and the preset coefficient.

[0137] In some embodiments, the control module 84 is further configured to determine the preset coefficient by receiving an operation instruction on a preset interface; or record at least one historical carbon dioxide absorption amount corresponding to when at least one carbon dioxide absorption device is replaced; determine the average value of the historical carbon dioxide absorption amounts according to the at least one historical carbon dioxide absorption amount; and determine or update the preset coefficient according to the ratio of the average value of the historical carbon dioxide absorption amounts to the calibrated absorption amount threshold.

[0138] In some embodiments, the control module 84 is further configured to record at least one historical carbon dioxide absorption amount corresponding to when at least one carbon dioxide absorption device is replaced; determine an average value of the historical carbon dioxide absorption amounts according to the at least one historical carbon dioxide absorption amount; and determine or update the absorption amount threshold according to the average value of the historical carbon dioxide absorption amounts.

[0139] In some embodiments, the control module 84 is further configured to determine that the remaining amount of soda lime is less than a preset usage amount threshold when the carbon dioxide absorption amount is greater than or equal to the absorption amount threshold.

[0140] In some embodiments, the control module 84 is further configured to determine the total weight of the soda lime according to the volume of the soda lime loaded in the carbon dioxide absorption device; determine the total consumption amount of the soda lime according to the carbon dioxide absorption amount; and determine the remaining amount situation according to the total consumption amount of the soda lime and the total weight of the soda lime.

[0141] In some embodiments, the control module 84 is further configured to determine that the remaining amount of soda lime is less than a preset usage amount threshold when the total consumption amount of the soda lime is greater than or equal to the total weight of the soda lime.

[0142] In some embodiments, the control module 84 is further configured to obtain a preset ventilation volume corresponding to the inhaled gas at the patient end; determine an estimated carbon dioxide concentration of the gas flowing into the carbon dioxide absorption device based on the carbon dioxide exhalation concentration; determine an estimated flow rate of the gas flowing into the carbon dioxide absorption device based on the preset ventilation volume; determine the carbon dioxide absorption amount corresponding to the carbon dioxide absorption device according to the estimated carbon dioxide concentration and the estimated flow rate; determine whether the carbon dioxide inhalation concentration is greater than or equal to a preset inhalation concentration threshold when the carbon dioxide absorption amount is greater than or equal to the absorption amount threshold corresponding to the carbon dioxide absorption device, or when the total consumption amount of the soda lime corresponding to the carbon dioxide absorption amount is greater than or equal to the total weight of the soda lime in the carbon dioxide absorption device; and determine that the remaining amount of soda lime is less than a preset usage amount threshold when the carbon dioxide inhalation concentration is greater than or equal to the preset inhalation concentration threshold.

[0143] In some embodiments, the control module 84 is further configured to control to give an alarm or a prompt when the remaining amount of soda lime is less than a preset usage amount threshold.

[0144] It should be noted that the description of the above anesthesia machine embodiments is similar to the description of the above soda lime usage detection method embodiments, and has similar beneficial effects to the soda lime usage detection method embodiments. For the technical details not disclosed in the anesthesia machine embodiments of the present invention, please refer to the description of the soda lime usage detection method embodiments of the present invention for understanding.

[0145] Those skilled in the art should understand that the embodiments of the present invention can be provided as a method, a system, or a computer program product. Therefore, the present invention can take the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk memories and optical memories, etc.) that contain computer-usable program code.

[0146] The present invention is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to the embodiments of the present invention. It should be understood that each flow and / or block in the flowchart and / or block diagram, as well as the combination of flows and / or blocks in the flowchart and / or block diagram, can be realized by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate a device for realizing the functions specified in one Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0147] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory generate a manufactured article including an instruction device, and the instruction device realizes the functions specified in one Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0148] These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process, and thus the instructions executed on the computer or other programmable device provide steps for realizing the functions specified in one Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0149] As mentioned above, only the preferred embodiments of the present invention are described, and they are not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and scope of the present invention are included in the protection scope of the present invention.

Claims

1. A method for detecting the dosage of soda lime, characterized in that, Including: Obtaining at least one of the carbon dioxide inhalation concentration of the inhaled gas at the patient end and the carbon dioxide exhalation concentration of the exhaled gas at the patient end; Determining the remaining usage amount of soda lime in the carbon dioxide absorption device according to at least one of the carbon dioxide inhalation concentration and the carbon dioxide exhalation concentration.

2. The method according to claim 1, wherein The determining the remaining usage amount of soda lime in the carbon dioxide absorption device according to at least one of the carbon dioxide inhalation concentration and the carbon dioxide exhalation concentration includes: When the carbon dioxide inhalation concentration is greater than or equal to a preset inhalation concentration threshold, determining that the remaining usage amount of the soda lime is less than a preset usage amount threshold.

3. The method according to claim 1, wherein The determining the remaining usage amount of the soda lime according to at least one of the carbon dioxide inhalation concentration and the carbon dioxide exhalation concentration includes: Obtaining the preset ventilation volume at the patient end; Based on the carbon dioxide exhalation concentration, determining the estimated carbon dioxide concentration of the gas flowing into the carbon dioxide absorption device; Based on the preset ventilation volume, determining the estimated flow rate of the gas flowing into the carbon dioxide absorption device; According to the estimated carbon dioxide concentration and the estimated flow rate, determining the carbon dioxide absorption amount corresponding to the carbon dioxide absorption device; According to the carbon dioxide absorption amount, determining the remaining usage amount of the soda lime.

4. The method according to claim 3, characterized in that, The determining the estimated carbon dioxide concentration of the gas flowing into the carbon dioxide absorption device based on the carbon dioxide exhalation concentration includes: Determining the carbon dioxide exhalation concentration as the estimated carbon dioxide concentration.

5. The method according to claim 3, characterized in that, The inhaled gas at the patient end includes: fresh gas provided to the patient end and re-inhaled gas formed after the exhaled gas at the patient end passes through the carbon dioxide absorption device; the fresh gas does not contain carbon dioxide; the determining the estimated carbon dioxide concentration of the gas flowing into the carbon dioxide absorption device based on the carbon dioxide exhalation concentration includes: Obtaining the fresh gas ventilation volume of the fresh gas; According to the difference between the preset ventilation volume and the fresh gas ventilation volume, determining the gas flow rate of the re-inhaled gas; According to the gas flow rate of the re-inhaled gas and the carbon dioxide exhalation concentration, determining the estimated carbon dioxide concentration.

6. The method according to claim 5, characterized in that, The determining the estimated carbon dioxide concentration according to the gas flow rate of the re-inhaled gas and the carbon dioxide exhalation concentration includes: Determining the ratio of the gas flow rate of the re-inhaled gas to the preset ventilation volume; According to the product of the ratio and the carbon dioxide exhalation concentration, determining the estimated carbon dioxide concentration.

7. The method according to claim 3, characterized in that, The determining the estimated flow rate of the gas flowing into the carbon dioxide absorption device based on the preset ventilation volume includes: Determining the preset ventilation volume as the estimated flow rate.

8. The method according to claim 3, wherein The inhaled gas at the patient end includes: fresh gas provided to the patient end and re-inhaled gas formed after the exhaled gas at the patient end passes through the carbon dioxide absorption device; the fresh gas does not contain carbon dioxide; the determining the estimated flow rate of the gas flowing into the carbon dioxide absorption device based on the preset ventilation volume includes: Obtaining the fresh gas ventilation volume of the fresh gas; Determine the gas flow rate of the rebreathing gas according to the difference between the preset ventilation volume and the fresh gas ventilation volume; Determine the estimated flow rate according to the gas flow rate of the rebreathing gas and the carbon dioxide exhalation concentration.

9. The method according to claim 8, wherein The determining the estimated flow rate according to the gas flow rate of the rebreathing gas and the carbon dioxide exhalation concentration includes: Determine the non-carbon dioxide gas concentration corresponding to the non-carbon dioxide gas in the exhaled gas according to the carbon dioxide exhalation concentration; the non-carbon dioxide gas includes other gases in the exhaled gas except carbon dioxide; Determine the estimated flow rate according to the ratio of the gas flow rate of the rebreathing gas to the non-carbon dioxide gas concentration.

10. The method according to claim 1, characterized in that The determining the remaining amount of soda lime in the carbon dioxide absorption device according to at least one of the carbon dioxide inhalation concentration and the carbon dioxide exhalation concentration includes: Obtain the preset ventilation volume at the patient end; Determine the carbon dioxide absorption amount corresponding to the carbon dioxide absorption device according to the carbon dioxide exhalation concentration and the preset ventilation volume; Determine the remaining amount of soda lime according to the carbon dioxide absorption amount.

11. The method according to any one of claims 3-9, characterized in that, The determining the carbon dioxide absorption amount corresponding to the carbon dioxide absorption device according to the estimated carbon dioxide concentration and the estimated flow rate includes: Determine the cumulative value within at least one time period by accumulating the estimated carbon dioxide concentration and the estimated flow rate within at least one time period, and use the cumulative value as the carbon dioxide absorption amount.

12. The method according to claim 11, wherein The determining the remaining amount of soda lime according to the carbon dioxide absorption amount includes: Determine or update the absorption amount threshold of the soda lime loaded in the carbon dioxide absorption device; Determine the remaining amount according to the carbon dioxide absorption amount and the absorption amount threshold.

13. The method according to claim 12, characterized in that, The determining or updating the absorption amount threshold of the soda lime loaded in the carbon dioxide absorption device includes: Determine the total weight of the soda lime according to the volume of the soda lime loaded in the carbon dioxide absorption device, and determine the current calibrated absorption amount threshold of the carbon dioxide absorption device based on the total weight of the soda lime; Determine or update the preset coefficient for the soda lime to absorb carbon dioxide; Determine or update the absorption amount threshold according to the calibrated absorption amount threshold and the preset coefficient.

14. The method according to claim 13, wherein The determining or updating the preset coefficient for the soda lime to absorb carbon dioxide includes: Determine the preset coefficient by receiving an operation instruction on a preset interface; Or, record at least one historical carbon dioxide absorption amount corresponding to when at least one carbon dioxide absorption device is replaced; determine the average value of the historical carbon dioxide absorption amounts according to the at least one historical carbon dioxide absorption amount; determine or update the preset coefficient according to the ratio of the average value of the historical carbon dioxide absorption amounts to the calibrated absorption amount threshold.

15. The method according to claim 12, wherein The determining or updating the absorption amount threshold of the soda lime loaded in the carbon dioxide absorption device includes: Record at least one historical carbon dioxide absorption amount corresponding to when at least one carbon dioxide absorption device is replaced; Determine the average value of the historical carbon dioxide absorption amounts according to the at least one historical carbon dioxide absorption amount; Determine or update the absorption threshold according to the average value of the historical carbon dioxide absorption amount.

16. The method according to claim 12, characterized in that, Determining the remaining usage situation according to the carbon dioxide absorption amount and the absorption threshold includes: When the carbon dioxide absorption amount is greater than or equal to the absorption threshold, it is determined that the remaining usage amount of the soda lime is less than a preset usage threshold.

17. The method according to claim 11, wherein Determining the remaining usage situation of the soda lime according to the carbon dioxide absorption amount includes: Determine the total weight of the soda lime according to the volume of the soda lime loaded in the carbon dioxide absorption device; Determine the total consumption of the soda lime according to the carbon dioxide absorption amount; Determine the remaining usage situation according to the total consumption of the soda lime and the total weight of the soda lime.

18. The method according to claim 17, wherein Determining the remaining usage situation according to the total consumption of the soda lime and the total weight of the soda lime includes: When the total consumption of the soda lime is greater than or equal to the total weight of the soda lime, it is determined that the remaining usage amount of the soda lime is less than a preset usage threshold.

19. The method according to claim 1, characterized in that, Determining the remaining usage situation of the soda lime in the carbon dioxide absorption device according to at least one of the carbon dioxide inhalation concentration and the carbon dioxide exhalation concentration includes: Obtain the preset ventilation volume corresponding to the inhaled gas at the patient end; Based on the carbon dioxide exhalation concentration, determine the estimated carbon dioxide concentration of the gas flowing into the carbon dioxide absorption device; Based on the preset ventilation volume, determine the estimated flow rate of the gas flowing into the carbon dioxide absorption device; Determine the carbon dioxide absorption amount corresponding to the carbon dioxide absorption device according to the estimated carbon dioxide concentration and the estimated flow rate; When the carbon dioxide absorption amount is greater than or equal to the absorption threshold corresponding to the carbon dioxide absorption device, or when the total consumption of the soda lime corresponding to the carbon dioxide absorption amount is greater than or equal to the total weight of the soda lime in the carbon dioxide absorption device, determine whether the carbon dioxide inhalation concentration is greater than or equal to a preset inhalation concentration threshold; When the carbon dioxide inhalation concentration is greater than or equal to the preset inhalation concentration threshold, it is determined that the remaining usage amount of the soda lime is less than a preset usage threshold.

20. The method according to any one of claims 1-9 or any one of claims 12-19, characterized in that, The method further includes: When the remaining usage amount of the soda lime is less than a preset usage threshold, control to give an alarm or a prompt.

21. An anesthetic machine, characterized in that, The anesthesia machine includes: a ventilation device, a carbon dioxide absorption device, a gas detection module, a flow detection module and a control module; the ventilation device is connected to the patient end through a breathing circuit; the carbon dioxide absorption device is arranged on the breathing circuit; the carbon dioxide absorption device is loaded with soda lime; the sampling point of the gas detection module is arranged on the connection path between the breathing circuit and the patient end; the flow detection module is connected to a gas supply device, and the gas supply device is used to provide fresh gas to the patient end through the breathing circuit; the fresh gas does not contain carbon dioxide; the inhaled gas at the patient end includes: the fresh gas and the re-inhaled gas formed after the exhaled gas at the patient end passes through the carbon dioxide absorption device; wherein, The ventilation device is used to provide positive pressure ventilation to the patient end; The gas detection module is used to detect at least one of the carbon dioxide inhalation concentration of the inhaled gas at the patient end and the carbon dioxide exhalation concentration of the exhaled gas at the patient end; The control module is used to execute the soda lime dosage detection method described in any one of claims 1 to 20.

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