Patent Description:
In order to improve oxygenation index of a patient or improve condition of an intubated patient, doctor needs to provide the patient with oxygen ventilation of high flow rate.

This disclosure provides a medical ventilation system.

According to an embodiment of this disclosure, a medical ventilation system is provided, which including an input device, a first gas source interface, a second gas source interface, a respiratory line, a drive gas branch, a fresh gas branch, and a ventilation controller; wherein one end of the drive gas branch is connected with the first gas source interface, and the other end of the drive gas branch is connected with the respiratory line;.

The medical ventilation system provided by the embodiment of the disclosure, in combination with the existing medical ventilation system technology, can not only provide a patient with conventional ventilation support, but also provide the patient with ventilation support of high flow rate, by using the gas line system of the medical ventilation system without adding new devices or configurations. It follows the pipe connection mode of the existing technology without needing to change the existing pipe connection mode, thus reducing the complexity. <CIT> describes a medical ventilation system for the delivery of anesthetic drugs using a fresh gas source and a driving gas source.

It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and do not limit the disclosure.

In order to more clearly explain the embodiments of this disclosure or the technical solutions in the prior art, the following briefly introduces the drawings which are needed to be used in the description of the embodiments or the prior art. It is obvious that the drawings in the following description are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained from these accompanying drawings without paying any creative works.

The technical solutions in the embodiments of this disclosure will be described clearly and completely below in combination with the drawings in the embodiments of this disclosure. Obviously, the described embodiments are just some of the embodiments of this disclosure, not all of them. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without making creative work fall within the protection scope of this disclosure.

In the description of this disclosure, it should be understood that the terms, such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner" , "outer", "clockwise", "anticlockwise", which indicate the azimuth or positional relationship, are based on the azimuth or positional relationship shown in the attached drawings. It is only for the convenience of description and simplification the description, rather than indicating or implying that the device or element referred to must have a specific azimuth, be constructed or operated in a specific azimuth. Therefore, it cannot be understood as a limitation of this disclosure. In addition, the terms "first" and "second" are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this disclosure, "multiple" means two or more, unless otherwise expressly and specifically defined.

Some embodiments of this disclosure are described in detail below in combination with the accompanying drawings. The following embodiments and features in the embodiments may be combined with each other without conflict.

The most basic and important function of modern medical ventilation system is to assist or control respiration. According to whether the oxygen flow rate provided by the medical ventilation system can fully satisfy the inspiratory requirement of the patient, the medical ventilation systems can be divided into an oxygen supply system with low flow rate and an oxygen supply system with high flow rate.

Specifically, the oxygen supply system with low flow rate has a low oxygen supply rate which cannot satisfies all the oxygen inspiration requirements for the patient, but the patient feels more comfortable and its use is more convenient.

The oxygen supply system with high flow rate has a high oxygen supply rate. During oxygen therapy, it can provide pure oxygen with a maximum flow rate of <NUM>/min or greater, or a mixed gas with a maximum flow rate of <NUM>/min, which can fully satisfy all the oxygen inspiration requirements, effectively improve the oxygenation index, and provide the patient with oxygen therapy of high flow rate when necessary.

The embodiment of this disclosure provides a medical ventilation system integrating the conventional function of the medical ventilation system and the high flow rate oxygen supply function. On the premise of adding no new device or configuration, the medical ventilation system is configured to realize the high flow rate oxygen supply scheme at the patient end, and the pipeline connection is simple and convenient for doctor to use.

Refer to <FIG> is a structural schematic block diagram of a medical ventilation system provided by an embodiment of this disclosure. <FIG> is a structural schematic diagram of a medical ventilation system provided by an embodiment of this disclosure. The medical ventilation system <NUM> includes an input device <NUM>, a first gas source interface <NUM>, a second gas source interface <NUM>, a respiratory line <NUM>, a drive gas branch <NUM>, a fresh gas branch <NUM>, and a ventilation controller <NUM>.

Specifically, the input device <NUM> may be a switch for switching a first mode and a second mode, and may also be a mechanical knob, an electronic input device (touch screen), or a control panel or other device that receives ventilation control information. It can be understood that the present embodiment is not limited to the above input device <NUM>. The first gas source interface <NUM> and the second gas source interface <NUM> can be connected with a gas cylinder or a hospital centralized gas supply system, for receiving oxygen and auxiliary gas. Here, the auxiliary gas may be air or laughing gas, and the likes.

One end of the drive gas branch <NUM> is connected with the first gas source interface <NUM>, and the other end of the drive gas branch <NUM> is connected with the respiratory line <NUM>. In the first mode of the medical ventilation system, the drive gas branch <NUM> provides respiratory support to a patient <NUM> through the respiratory line <NUM>. When the patient <NUM> needs to inhale, the drive gas branch <NUM> outputs gas to the patient <NUM> through the respiratory line <NUM>. When the patient <NUM> needs to exhale, the drive gas branch <NUM> and the respiratory line <NUM> receive exhaled gas of the patient <NUM>.

One end of the fresh gas branch <NUM> is connected with the first gas source interface <NUM> and the second gas source interface <NUM>, and the other end of the fresh gas branch <NUM> is connected with the respiratory line <NUM>. In the first mode of the medical ventilation system, the fresh gas branch <NUM> transmits oxygen and auxiliary gas which are outputted from the first gas source interface <NUM> and the second gas source interface <NUM> to the anesthetic evaporator <NUM> for outputting a fresh gas which contains anesthetic drug to the respiratory line <NUM>, and then transmits the fresh gas which contains anesthetic drug to the patient <NUM> through the respiratory line <NUM> for realizing the anesthetic drug supplement to the patient <NUM>.

The ventilation controller <NUM> is configured to control the drive gas branch <NUM> to provide ventilation support for the patient through the respiratory line <NUM>, and to control the fresh gas branch <NUM> to output the fresh gas which contains anesthetic drug to the respiratory line <NUM>, according to first mode control information which is receive by the input device <NUM>.

The ventilation controller <NUM> receives the first mode control information which is outputted by the input device <NUM> and controls the medical ventilation system <NUM> to enter the first mode. In the first mode, the drive gas branch <NUM> is controlled to provide ventilation support for the patient through the respiratory line <NUM>, and the fresh gas branch <NUM> is controlled to output the fresh gas which contains anesthetic drug to the respiratory line <NUM> to realize anesthetization of the patient.

The ventilation controller <NUM> is further configured to control the drive gas branch <NUM> to output a first gas to the respiratory line <NUM>, and to control the fresh gas branch <NUM> to output a second gas to the respiratory line <NUM>, according to second mode control information which is receive by the input device <NUM>.

The ventilation controller <NUM> receives the second mode control information which is outputted by the input device <NUM> and controls the medical ventilation system <NUM> to enter the second mode. In the second mode, the drive gas branch <NUM> can output a gas which is outputted by the first gas source interface <NUM>, to the respiratory line <NUM>. Correspondingly, the fresh gas branch <NUM> can output, at least a gas which is outputted by the first gas source interface <NUM> or the second gas source interface <NUM>, to the respiratory line <NUM>.

In the second mode, if a gas concentration which is outputted through the respiratory line <NUM> needs no adjustment, the fresh gas branch <NUM> can also output the gas which is outputted by the first gas source interface <NUM> to the respiratory line <NUM>. At this time, the first gas source interface <NUM> is connected to an oxygen or air source.

In the second mode, if the gas concentration which is outputted through the respiratory line <NUM> needs to be adjusted, the fresh gas branch <NUM> can output the gas which is outputted by the second gas source interface <NUM> to the respiratory line <NUM>, and the fresh gas branch <NUM> can also output the mixed gases which are outputted by the first gas source interface <NUM> and the second gas source interface <NUM> to the respiratory line <NUM>. Since both the drive gas branch <NUM> and the fresh gas branch <NUM> can adjust a flow rate of the gas, an oxygen concentration of the oxygen and auxiliary gas which are inputted into the respiratory line <NUM> can be adjusted adaptively, so as to control the flow rate and/or oxygen supply concentration of the gas which are outputted from the respiratory line <NUM> to the patient <NUM>.

Specifically, the respiratory line <NUM> includes an expiratory branch <NUM> and an inspiratory branch <NUM>. The expiratory branch <NUM> includes an expiratory pipeline <NUM> and an expiratory check valve <NUM> arranged at the expiratory pipeline <NUM>. The expiratory pipeline <NUM>, the expiratory check valve <NUM>, and the drive gas branch <NUM> form an expiratory channel for the exhaled gas of the patient <NUM>. The inspiratory branch <NUM> includes an inspiratory pipeline <NUM>, an inspiratory check valve <NUM> and an absorption tank <NUM> arranged at the inspiratory pipeline <NUM>. In the first mode, when the patient exhales, the expiratory branch <NUM> and the drive gas branch <NUM> receive the exhaled gas of the patient. When the patient inhales, the ventilation controller <NUM> controls the first gas source interface <NUM> to output gas to provide inspiratory support pressure, filters the exhaled gas in the drive gas branch <NUM> and the inspiratory branch <NUM> through the absorption tank <NUM>, mixes it with the fresh gas which is outputted from the fresh gas branch <NUM>, and delivers the mixed gas to the patient <NUM> to provide inspiratory support for the patient <NUM>. The absorption tank <NUM> is arranged inside the inspiratory channel for absorbing carbon dioxide in the exhaled gas which is discharged by the drive gas branch <NUM>. In this embodiment, the absorption tank <NUM> is arranged between the drive gas branch <NUM> and the inspiratory check valve <NUM>, and is filled with sodium lime.

It is understandable that in some other embodiments, the absorption tank <NUM> may be filled with other filter materials for filtering carbon dioxide, which is not limited here. Since there is moisture in the respiratory line <NUM> during operation, especially the absorption tank <NUM> releases water in the form of liquid or gas. Therefore, during oxygen supply, the gas is humidified when the oxygen passes through the respiratory line <NUM>, especially the absorption tank <NUM> which acts as a humidifier.

In the medical ventilation system <NUM> designed in this disclosure, when the user selects the first mode through the input device <NUM>, the ventilation controller <NUM> is configured to control the drive gas branch <NUM> to provide ventilation support for the patient through the respiratory line <NUM>, and to control the fresh gas branch <NUM> to output a fresh gas which contains anesthetic drug to the respiratory line <NUM>. When the user selects the second mode through the input device <NUM>, the ventilation controller <NUM> is configured to control the drive gas branch <NUM> to output the gas which is outputted by the first gas source interface <NUM> to the respiratory line <NUM>, and to control the fresh gas branch <NUM> to output at least the gas which is outputted by the first gas source interface <NUM> or the second gas source interface <NUM> to the respiratory line <NUM>. Thus, under the condition of maintaining the conventional anesthetization function of the prior medical ventilation system, when the second mode is selected, the oxygen supply function of a high flow rate can be realized without changing the existing pipeline connection mode, and the complexity of the prior medical ventilation system with the high flow rate can be effectively reduced.

In an optional embodiment, the first mode control information may include one or more of first mode selection information or first mode ventilation control information, the second mode control information includes one or more of second mode selection information or second mode ventilation control information.

Specifically, the first mode selection information is a mode selection information for selecting a conventional function of the medical ventilation system, and the second mode information is a mode selection information for selecting a high flow rate oxygen supply function of the medical ventilation system. Both the first mode selection information and the second mode selection information are inputted by the user through the input device <NUM>.

Accordingly, the first mode ventilation control information may include one or more of conventional ventilation parameters, such as a respiratory rate, an inspiratory flow rate, an inspiratory pressure, an expiratory pressure, an anesthetic drug concentration or a tidal volume, and the user may adjust them as required.

The second mode ventilation control information may include an gas supply flow rate and/or an oxygen supply concentration. Since the second mode is a high flow rate oxygen therapy mode, it is possible to provide high flow rate oxygen supply to the patient <NUM> by adjusting the air supply flow rate and/or oxygen supply concentration.

In an optional embodiment, the drive gas branch <NUM> includes a drive main line <NUM>, which includes a first flow controller <NUM> and an gas storage device which are connected in sequence, and an expiratory valve <NUM> which is connected to the gas storage device to discharge excess gas in the gas storage device. The gas storage device can adopt either the bellows-free technology or the bellows technology.

Specifically, as shown in <FIG>, when the bellows-free technology is adopted, the gas storage device can be a volumetric exchanger <NUM>, which is similar to a long and narrow gas duct without rigid separation at both ends and can be interconnected by ventilation. The first flow controller <NUM> may be a proportional valve for controlling the flow rate of oxygen or auxiliary gas entering the volumetric exchanger <NUM>. When the patient <NUM> exhales, the expiratory valve <NUM> discharges the excess gas in the volumetric exchanger <NUM> to limit the expiratory gas pressure of the patient <NUM>.

<FIG> is a structural diagram of a medical ventilation system in a first mode using a volumetric exchanger <NUM>. As shown in <FIG>, when the ventilation controller <NUM> receives the first mode control information from the input device <NUM>, it switches the mode of the medical ventilation system to the first mode. The drive gas branch <NUM> provides respiratory support to the patient <NUM> through the respiratory line <NUM>. When the patient <NUM> needs to inhale, the volumetric exchanger <NUM> outputs a gas to the patient <NUM> through the respiratory line <NUM>. When the patient <NUM> needs to exhale, the volumetric exchanger <NUM> and the respiratory line <NUM> receive the exhaled gas of the patient <NUM>.

In addition, in the first mode, the fresh gas branch <NUM> transmits the oxygen and auxiliary gas, which are outputted from the first gas source interface <NUM> and the second gas source interface <NUM>, through the anesthetic evaporator <NUM> to output a fresh gas which contains anesthetic drug to the respiratory line <NUM>, and then transmits the fresh gas which contains anesthetic drug to the patient <NUM> through the respiratory line <NUM>, so as to realize the anesthetic drug supplement to the patient <NUM>. After the patient is anesthetized, the anesthetic evaporator <NUM> can be turned off. Thus, the medical ventilation system can provide ventilation support and low flow rate oxygen support for patient <NUM>.

<FIG> is a structural diagram of a medical ventilation system in a second mode using a volumetric exchanger <NUM>. As shown in <FIG>, when the ventilation controller <NUM> receives the second mode control information from the input device <NUM>, it switches the mode of the medical ventilation system to the second mode. The drive gas branch <NUM> outputs the gas which is outputted by the first gas source interface <NUM> to the respiratory line <NUM>. Accordingly, the fresh gas branch <NUM> also outputs at least the gas which is outputted by the first gas source interface <NUM> or the second gas source interface <NUM> to the respiratory line.

In an optional embodiment, as shown in <FIG>, which is a structural diagram of the medical ventilation system in the first mode when the bellows technology is adopted. In the first mode, the ventilation controller <NUM> controls the drive gas branch <NUM> to provide ventilation support for the patient. Specifically, the bellows <NUM> provides respiratory support to the patient <NUM> through the respiratory line <NUM>. When the patient <NUM> needs to inhale, the bellows <NUM> outputs gas to the patient <NUM> through the respiratory line <NUM>. When the patient <NUM> needs to exhale, the bellows <NUM> and the respiratory line <NUM> receive the exhaled gas of the patient <NUM>.

In addition, in the first mode, the fresh gas branch <NUM> transmits the oxygen and auxiliary gas, which are outputted from the first gas source interface <NUM> and the second gas source interface <NUM>, through the anesthetic evaporator <NUM> to output a fresh gas which contains anesthetic drug to the respiratory line <NUM>, and then transmits the fresh gas which contains anesthetic drug to the patient <NUM> through the respiratory line <NUM>, so as to realize the anesthetic drug supplement and/or provide oxygen support to the patient <NUM>.

<FIG> is a structural diagram of the medical ventilation system in the second mode when the bellows technology is adopted. As shown in <FIG>, one end of the bellows <NUM> is connected with the first gas source interface <NUM> through the first flow controller <NUM>, and the other end of the bellows <NUM> is connected with the expiratory branch <NUM> and the inspiratory branch <NUM>. A folding bag <NUM> is arranged inside the bellows <NUM>. The first flow controller <NUM> controls the drive gas which flows into the bellows <NUM> through the first gas source interface <NUM>, and the drive gas compresses the folding bag <NUM>. The expiratory valve <NUM> is connected with the folding bag <NUM> to discharge the excess gas in the folding bag <NUM> and control the expiratory pressure of the patient <NUM>.

In the second mode, the gas, which is outputted from the first gas source interface <NUM>, is outputted to the respiratory line <NUM> through the gas storage bypass <NUM> of the drive gas branch <NUM>. Accordingly, the fresh gas branch <NUM> outputs at least the gas which is outputted by the first gas source interface <NUM> or the second gas source interface <NUM> to the respiratory line <NUM>.

More specifically, when the ventilation controller <NUM> receives the second mode control information from the input device <NUM>, it switches the mode of the medical ventilation system to the second mode, closes the main drive line <NUM> where the bellows <NUM> is located, opens the gas storage bypass <NUM>, and outputs the gas which is outputted by the first gas source interface <NUM> to the respiratory line <NUM> through the gas storage bypass <NUM>. Accordingly, the fresh gas branch <NUM> outputs at least the gas which is outputted by the first gas source interface <NUM> or the second gas source interface <NUM> to the respiratory line <NUM>. The closing of the drive main line <NUM> where the bellows <NUM> is located or the opening of the gas storage bypass <NUM> can be controlled by the corresponding valves on the drive main line <NUM> or the gas storage bypass <NUM>.

In an optional embodiment, referring to <FIG>, the fresh gas branch <NUM> includes a first gas branch <NUM>, a second gas branch <NUM> and a mixing branch <NUM>. One end of the first gas branch <NUM> is connected with the first gas source interface <NUM>, one end of the second gas branch <NUM> is connected with the second gas source interface <NUM>, and the other ends of the first gas branch <NUM> and the second gas branch <NUM> are connected with the mixing branch <NUM>. The mixing branch <NUM> is provided with an anesthetic evaporator <NUM>.

Referring to <FIG> and <FIG>, in the first mode, the fresh gas, which is inputted through the first gas branch <NUM> and the second gas branch <NUM>, is outputted to the respiratory line <NUM> after passing through the anesthetic evaporator <NUM>. No matter the gas storage device is a bellows <NUM> or a volumetric exchanger <NUM>, in the first mode, the drive gas branch <NUM> provides respiratory support to the patient <NUM> through the respiratory line <NUM>. When the patient <NUM> needs to inhale, the drive gas branch <NUM> outputs gas to the patient <NUM> through the respiratory line <NUM>. When the patient <NUM> needs to exhale, the drive gas branch <NUM> and the respiratory line <NUM> receive the exhaled gas of the patient <NUM>.

In the fresh gas branch <NUM>, one end of the first gas branch <NUM> is connected with the first gas source interface <NUM>, one end of the second gas branch <NUM> is connected with the second gas source interface <NUM>, and the other ends of the first gas branch <NUM> and the second gas branch <NUM> are connected with the mixing branch <NUM>. In the first mode, after the oxygen and auxiliary gas, which are outputted by the first gas source interface <NUM> and the second gas source interface <NUM>, are evaporated through the anesthetic evaporator <NUM>, the mixing branch <NUM> outputs the fresh gas which contains anesthetic drug to the respiratory line <NUM> and transmitted it to the patient <NUM> through the respiratory line <NUM> to realize the supply and supplement of anesthetic drug to the patient <NUM>.

Referring to <FIG> and <FIG>, in the second mode, the drive gas branch <NUM> can output the gas which is outputted by the first gas source interface <NUM> to the respiratory line <NUM>. Accordingly, the first gas branch <NUM> and/or the second gas branch <NUM> output at least the gas which is outputted by the first gas source interface <NUM> or the second gas source interface <NUM> to the respiratory line <NUM>. In one embodiment, the gas which is outputted by the first gas branch <NUM> and/or the second gas branch <NUM> can be outputted to the respiratory line <NUM> through the mixing branch <NUM>. At this time, the anesthetic evaporator <NUM> is turned off. In another embodiment, the fresh gas branch <NUM> also includes an evaporator bypass <NUM>, and the gas which is outputted by the first gas branch <NUM> and/or the second gas branch <NUM> can also be outputted to the respiratory line <NUM> through the evaporator bypass <NUM>.

Specifically, the anesthetic evaporator <NUM> and the mixing branch <NUM> where the anesthetic evaporator <NUM> locates, as well as the evaporator bypass <NUM>, can be closed or opened through valve control.

In an optional embodiment, the first gas branch <NUM> is provided with a second flow controller <NUM> that controls an input gas flow of the first gas source interface <NUM>, and the second gas branch <NUM> is provided with a third flow controller <NUM> that controls an input gas flow of the second gas source interface <NUM>. The second flow controller <NUM> or the third flow controller <NUM> may be an electronic flowmeter or a mechanical flowmeter capable of realizing flow control.

It can be understood that the flow sensor <NUM> can be arranged at the drive gas branch <NUM>, the first gas branch <NUM> and the second gas branch <NUM>; the expiratory flow sensor <NUM> can be arranged at the expiratory branch <NUM> in the respiratory line13; and the inspiratory flow sensor <NUM> can be arranged at the inspiratory branch <NUM>; to detect the gas flow rates on the corresponding branches.

In the description of the application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection" and "connected with" should be understood in a broad sense, for example, they can be fixed connections, removable connections, or integrated connections. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium. It can be the connection within two components or the interaction relationship between two components. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

In this disclosure, unless otherwise expressly provided and limited, the first feature is "above" or "below" the second feature may include direct contact between the first and second features, or the first and second features may not be in direct contact but through another feature contacting them. Moreover, the first feature is "above", "on" and "at the top of7" the second feature include that the first feature is directly above and obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than the second feature. The first feature is "below", "at the bottom of7" and "under" the second feature, include that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

The above disclosure provides many different embodiments or examples for implementing different structures of this disclosure. In order to simplify the disclosure of this disclosure, components and configurations of specific examples are described above. Of course, they are merely examples and are not intended to limit this disclosure. In addition, this disclosure may repeat reference numerals and/or reference letters in different examples for the purpose of simplification and clarity, and does not in itself indicate the relationship between the various embodiments and/or configurations discussed. In addition, this disclosure provides examples of various specific processes and materials, but those skilled in the art may be aware of the application of other processes and/or the use of other materials.

In the description of this specification, the description referring to the terms "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or features described in connection with the embodiments or examples are included in at least one embodiment or example of this application. In this specification, the schematic expression of the above terms does not necessarily refer to the same embodiments or examples. Further, the specific features, structures, materials, or features described may be combined in a suitable manner in any one or more embodiments or examples.

Claim 1:
A medical ventilation system (<NUM>), comprising:
an input device (<NUM>), a first gas source interface (<NUM>), a second gas source interface (<NUM>), a respiratory line (<NUM>), a drive gas branch (<NUM>), a fresh gas branch (<NUM>), and a ventilation controller (<NUM>); wherein one end of the drive gas branch (<NUM>) is connected with the first gas source interface (<NUM>), and the other end of the drive gas branch (<NUM>) is connected with the respiratory line (<NUM>);
one end of the fresh gas branch (<NUM>) is connected with the first gas source interface (<NUM>) and the second gas source interface (<NUM>), and the other end of the fresh gas branch (<NUM>) is connected with the respiratory line (<NUM>);
the ventilation controller (<NUM>) is configured to control the drive gas branch (<NUM>) to provide ventilation support for a patient through the respiratory line (<NUM>), and to control the fresh gas branch (<NUM>) to output a fresh gas which contains anesthetic drug to the respiratory line (<NUM>), according to first mode control information which is received by the input device (<NUM>);
characterized in that,
the ventilation controller (<NUM>) is further configured to control the drive gas branch (<NUM>) to output, a gas which is outputted by the first gas source interface (<NUM>), to the respiratory line (<NUM>); and to control the fresh gas branch (<NUM>) to output, at least a gas which is outputted by the first gas source interface (<NUM>) or the second gas source interface (<NUM>), to the respiratory line (<NUM>); according to second mode control information which is received by the input device (<NUM>);
the ventilation controller (<NUM>) is further configured to, according to the second mode control information, control the fresh gas branch (<NUM>) to output the gas by turning off an anesthetic evaporator (<NUM>) or providing an evaporator bypass (<NUM>) in the fresh gas branch (<NUM>).