Anaesthesia machine

Abstract

According to the anesthesia machine provided by the invention, the second fresh gas branch is communicated with the provided air compression device with adjustable air flow, and the air compression device provides air for the second fresh gas branch, so that an air cylinder does not need to be used as a standby air source, and the management risk and cost are reduced. Oxygen and / or laughing gas provided by the first fresh gas branch, air provided by the second fresh gas branch and anesthetic are mixed to obtain first mixed gas. The anesthetic conveying device conveys the first mixed gas into the breathing circuit, and then the breathing circuit is controlled by the ventilation control device to convey the first mixed gas to a patient, so that anesthetic breathing support is provided for the patient. The detection device is used for detecting the characterization quantity for characterizing the air flow characteristic of the second fresh gas branch; and the processor adjusts the air flow provided by the air compression device according to the characterization quantity, so that the air compression device does not need to work at full load, and the service time of the air compression device is prolonged.

Description

An anesthesia machine Technical Field

[0001] The present invention relates to the field of medical devices, and in particular to an anesthesia machine. Background Art

[0002] Anesthesia machines are used to provide patients with anesthetics and respiratory support. Modern anesthesia machines generally consist of a gas source, flow meter, vaporizer, patient circuit, anesthesia ventilator, and AGSS (anesthetic gas absorption system).

[0003] The gas source provides O2 (oxygen), Air (air), and N2O (laughing gas) to the patient's inhalation gas.

[0004] The flow meter controls the flow rate and oxygen concentration of the patient's inhaled gas.

[0005] The vaporizer controls the concentration of anesthetic in the gas inhaled by the patient.

[0006] The patient circuit delivers fresh gas containing O2 and anesthetic to the patient for inspiration, while receiving the patient's exhaled gas in order to transfer excess waste gas to the AGSS, and reuse most of the exhaled gas after removing CO2.

[0007] Anesthesia ventilators provide respiratory support to patients, controlling the volume or pressure of gas inhaled by the patient, as well as the respiratory rhythm.

[0008] AGSS collects excess gas exhaled by patients and connects it to the hospital's waste gas treatment system for waste gas treatment.

[0009] The gas sources for modern anesthesia machines include O2, Air, and N2O. It is easy to understand that O2 is indispensable, otherwise the patient will suffer from respiratory hypoxia. However, inhalation of oxygen alone is risky. Studies have shown that prolonged inhalation of pure oxygen can lead to oxygen poisoning. The role of Air is to reduce the oxygen concentration in fresh gas, which is especially important during long surgeries. N2O is a mild anesthetic gas, and its frequency of use varies greatly in different countries. The gas source can be connected through the hospital's central gas supply system or provided by high-pressure gas cylinders. High-pressure gas cylinders are generally used as a backup gas source. When the hospital's central gas supply system fails, the gas stored in the high-pressure gas cylinders can be used to input the gas source for the anesthesia machine.

[0010] The reality is that some hospitals lack central air supply systems, or even no central air supply system at all. Air, as a means of reducing the oxygen concentration of inhaled gas, is gaining increasing importance in today's increasingly safe anesthesia era. Without the hardware infrastructure for a central air supply system, hospitals rely on air cylinders as a backup source. However, as we all know, air cylinders are expensive, and the transportation, storage, and management of high-pressure gas carry risks and increased costs. Even medical institutions with central air supply systems still face the problem of using high-pressure air cylinders in the event of a system failure.

[0011] Therefore, the existing anesthesia machines that use air cylinders as backup gas sources have problems such as management risks and high costs, and need to be improved and enhanced.

[0012] Summary of the Invention

[0013] The present invention mainly provides an anesthesia machine which does not require an air cylinder as a backup gas source, thereby reducing management risks and costs.

[0014] One embodiment provides an anesthesia machine, comprising:

[0015] A first fresh gas branch for providing oxygen and / or nitrous oxide;

[0016] The second fresh gas branch is connected to an air compressor for providing air; the air flow rate provided by the air compressor is adjustable;

[0017] The first fresh gas branch and the second fresh gas branch are both in communication with an anesthetic delivery device, and the anesthetic delivery device is used to mix anesthetic, oxygen and / or nitrous oxide provided by the first fresh gas branch, and air provided by the second fresh gas branch to obtain a first mixed gas;

[0018] a breathing circuit, configured to receive the first mixed gas outputted by the anesthetic delivery device and deliver the first mixed gas to the patient;

[0019] a detection device for detecting a characteristic quantity characterizing air flow characteristics of the second fresh gas branch; and

[0020] The processor is used to adjust the air flow provided by the air compression device according to the characterization quantity output by the detection device.

[0021] One embodiment provides an anesthesia machine, comprising:

[0022] A first fresh gas branch for providing oxygen and / or nitrous oxide;

[0023] The second fresh gas branch is connected to an air compressor for providing air; the air flow rate provided by the air compressor is adjustable;

[0024] The first fresh gas branch and the second fresh gas branch are both in communication with an anesthetic delivery device, and the anesthetic delivery device is used to mix anesthetic, oxygen and / or nitrous oxide provided by the first fresh gas branch, and air provided by the second fresh gas branch to obtain a first mixed gas;

[0025] a breathing circuit, configured to receive the first mixed gas provided by the anesthetic delivery device;

[0026] a ventilation control device, configured to control the breathing circuit to deliver the first mixed gas to the patient, thereby providing anesthesia breathing support to the patient;

[0027] A human-computer interaction device, used for receiving a target flow setting value input by a user;

[0028] The processor is configured to adjust the air flow rate provided by the air compression device according to the target flow rate setting value.

[0029] One embodiment provides an anesthesia machine, comprising:

[0030] A first fresh gas branch for providing oxygen and / or nitrous oxide;

[0031] The second fresh gas branch is connected to an air compressor for providing air; the air flow rate provided by the air compressor is adjustable;

[0032] a second valve, configured to support a user in manually adjusting the air flow of the second fresh gas branch;

[0033] The first fresh gas branch and the second fresh gas branch are both in communication with an anesthetic delivery device, and the anesthetic delivery device is used to mix anesthetic, oxygen and / or nitrous oxide provided by the first fresh gas branch, and air provided by the second fresh gas branch to obtain a first mixed gas;

[0034] a breathing circuit, configured to receive the first mixed gas outputted by the anesthetic delivery device and deliver the first mixed gas to the patient;

[0035] a detection device for detecting an opening characteristic value of the second valve; and

[0036] The processor is used to adjust the output capacity of the air compression device according to the change of the opening characterizing quantity.

[0037] One embodiment provides an anesthesia machine, comprising:

[0038] A first fresh gas branch for providing oxygen and / or nitrous oxide;

[0039] The second fresh gas branch is connected to an air compression device for providing air;

[0040] The first fresh gas branch and the second fresh gas branch are both in communication with an anesthetic delivery device, and the anesthetic delivery device is used to mix anesthetic, oxygen and / or nitrous oxide provided by the first fresh gas branch, and air provided by the second fresh gas branch to obtain a first mixed gas;

[0041] a breathing circuit, configured to receive the first mixed gas output by the anesthetic delivery device;

[0042] Drive gas branch;

[0043] One end of the driving gas branch is connected to the air compression device, and the other end is connected to the breathing circuit; the driving gas branch is used to use the air provided by the air compression device as the driving gas to periodically drive the breathing circuit to deliver the first mixed gas to the patient; alternatively, the anesthesia machine also includes another air compression device, one end of the driving gas branch is connected to the other air compression device, and the other end is connected to the breathing circuit; the driving gas branch is used to use the air provided by the other air compression device as the driving gas to periodically drive the breathing circuit to deliver the first mixed gas to the patient.

[0044] According to the above-described embodiment of the anesthesia machine, its second fresh gas branch is connected to an air compressor with adjustable air flow. This air compressor provides air to the second fresh gas branch, eliminating the need for air cylinders as a backup gas source and reducing management risks and costs. Furthermore, a detection device detects a characteristic variable representing the air flow characteristics of the second fresh gas branch. The processor adjusts the air flow provided by the air compressor based on the characteristic variable, eliminating the need for the air compressor to operate at full capacity and thereby increasing the service life of the air compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] FIG1 is a structural block diagram of an anesthesia machine according to an embodiment of the present invention;

[0046] FIG2 is a structural block diagram of an anesthesia machine according to an embodiment of the present invention;

[0047] FIG3 is a gas circuit diagram of an air compression device and a portion of a second fresh gas branch in an anesthesia machine provided by the present invention;

[0048] FIG4 illustrates the working process of an anesthesia machine according to an embodiment of the present invention;

[0049] FIG5 is a flow chart of an embodiment of step 3 in FIG4 ;

[0050] FIG6 is a structural block diagram of an embodiment of a detection device in an anesthesia machine provided by the present invention;

[0051] FIG7 is a structural block diagram of an embodiment of an air compression device, a ventilation control device, and a breathing circuit in an anesthesia machine provided by the present invention;

[0052] FIG8 is a structural block diagram of another embodiment of an air compression device, a ventilation control device, and a breathing circuit in the anesthesia machine provided by the present invention;

[0053] FIG9 is a structural block diagram of an anesthesia machine according to an embodiment of the present invention; and

[0054] FIG10 is a structural block diagram of another embodiment of the anesthesia machine provided by the present invention. DETAILED DESCRIPTION

[0055] The present invention will be further described in detail below by means of specific embodiments in conjunction with the accompanying drawings. Similar elements in different embodiments are numbered with associated similar elements. In the following embodiments, many detailed descriptions are provided to enable the present application to be better understood. However, those skilled in the art will readily appreciate that some of the features may be omitted in different circumstances, or may be replaced by other elements, materials, or methods. In some cases, some operations related to the present application are not shown or described in the specification. This is to avoid the core portion of the present application being overwhelmed by excessive descriptions, and for those skilled in the art, it is not necessary to describe these related operations in detail. They will fully understand the related operations based on the description in the specification and the general technical knowledge in the art.

[0056] In addition, the features, operations, or characteristics described in the specification may be combined in any appropriate manner to form various embodiments. Furthermore, the steps or actions in the method description may be reordered or adjusted in a manner readily apparent to those skilled in the art. Therefore, the various sequences in the specification and drawings are provided solely for the purpose of clearly describing a particular embodiment and are not intended to be mandatory, unless otherwise specified.

[0057] The serial numbers assigned to components herein, such as "first," "second," etc., are used solely to distinguish the objects being described and do not convey any sequential or technical meaning. References to "connection" and "coupling" herein, unless otherwise specified, include both direct and indirect connections (couplings).

[0058] The present invention integrates a fresh gas branch within the anesthesia machine, which is connected to an air compressor and can be supplied with air. This anesthesia machine can deliver fresh gas without the need for an external central air supply system or high-pressure gas cylinders. It can also serve as a backup gas source, replacing high-pressure air cylinders, with virtually no management risk and low cost. This is explained in detail below using several specific embodiments.

[0059] As shown in Figures 1 and 2, the anesthesia machine provided by the present invention includes a processor 20, a first fresh gas branch 30, a second fresh gas branch 40, a breathing circuit 80, a ventilation control device 90 and a detection device 60.

[0060] The first fresh gas branch 30 is used to provide oxygen and / or nitrous oxide. The first fresh gas branch 30 may include an oxygen interface and / or a nitrous oxide interface. The oxygen interface is used to connect an external oxygen source or an internal oxygen source. An external oxygen source, such as an oxygen pipeline or oxygen cylinder in a central gas supply system, can provide oxygen to the anesthesia machine by docking with the oxygen interface. An internal oxygen source may include an oxygen concentrator, etc., which can provide oxygen to the anesthesia machine by docking with the oxygen interface. An external nitrous oxide source, such as a nitrous oxide pipeline or nitrous oxide cylinder in a central gas supply system, can provide nitrous oxide to the anesthesia machine by docking with the nitrous oxide interface. The first fresh gas branch 30 may also include one or more valves, some of which are used to adjust the flow of oxygen, and some of which are used to adjust the flow of nitrous oxide.

[0061] The second fresh gas branch 40 is connected to the air compression device 10. For example, the second fresh gas branch 40 can be directly connected to the output end of the air compression device 10, or it can be indirectly connected to the output end of the air compression device 10, as long as it can achieve communication with the output end of the air compression device 10. The second fresh gas branch 40 is used to provide air, such as providing air to the anesthetic delivery device 70 at the rear end. The air compression device 10 is used to compress air, for example, to obtain air from the external environment and compress it, and then provide the compressed air to the second fresh gas branch 40. The output capacity of the air compression device 10 is adjustable, for example, the air flow rate it provides is adjustable or the output air flow rate is adjustable. The air compression device 10 can be built into the housing of the anesthesia machine or can be placed outside the housing of the anesthesia machine. This embodiment is described using the former as an example, that is, the anesthesia machine in this embodiment includes or has an air compression device 10 built in.

[0062] The anesthesia machine may also include an air interface. The air interface is used to receive air provided from the outside, such as for connecting to an external air source. An external air source, such as an air duct in a central air supply system, can provide air to the anesthesia machine by docking with the air interface. Either the air interface or the air compression device 10 is connected to the second fresh gas branch 40. In one usage scenario, when the anesthesia machine is used in a hospital, the hospital's air duct can be connected to the air interface, and the anesthesia machine obtains fresh air from the hospital's central air supply system, with the air compression device 10 serving as a backup air source. When the hospital's central air supply system fails or the anesthesia machine is used outside the hospital, the air compression device 10 is started to provide air.

[0063] The air compression device 10 can have various types according to the different ways in which it compresses air. For example, the air can be compressed by the rotation of blades, or by the reciprocating motion of a piston. Therefore, its output capacity can be adjustable, which can be the speed, or the stroke or frequency of the reciprocating motion. From the perspective of work, the output power is adjustable, and from the perspective of the effect, the air flow rate provided (output) is adjustable. As shown in Figure 3, in one embodiment, the air compression device 10 includes: an air pump 130 with adjustable speed. Of course, in other embodiments, the air compression device 10 can also include a turbine or an air compressor, etc. The anesthesia machine can have an air inlet 110, a first filter 120, and a second filter 150. The air inlet 110, the first filter 120, the air pump 130, and the second filter 150 are connected in sequence.

[0064] The air inlet 110 is connected to the atmosphere. When the air pump 130 is operating, external air enters through the air inlet 110, passes through the first filter 120, and then enters the air compression device 10. The air pump 130 is used to compress the air entering the air inlet 110 and output it to the second fresh gas branch 40. The first filter 120 is located between the air inlet 110 and the air pump 130 and is used to filter the air about to enter the air pump 130. The second filter 150 is used to filter the air output by the air pump 130. For example, its filtration accuracy can reach 0.3μm, meeting the requirements of patient inhalation. A one-way valve 160 can also be provided in the second fresh gas branch 40. The one-way valve 160 is located after the second filter 150 and is used to output the air filtered by the second filter 150 in a one-way manner.

[0065] The second fresh gas branch 40 may also be provided with a normally closed pressure relief branch, such as branch 140 in Figure 3 . This branch may be located, for example, between the air pump 130 and the second filter 150. The normally closed pressure relief branch includes a relief valve 140, which is located at the rear end of the air pump 130. Relief valve 140 is used to open the normally closed pressure relief branch when the air pressure in the second fresh gas branch 40 exceeds the operating pressure, allowing the air in the second fresh gas branch 40 to flow out of the normally closed pressure relief branch.

[0066] The built-in air pump 130 draws air from the air inlet 110 and filters it through the first filter 120 to protect the air pump 130 and its downstream components. After being pressurized by the air pump 130, the air is then connected to a pressure sensor P0 and a relief valve 140. The pressure sensor P0 monitors the air pressure behind the air pump 130. The relief valve 140 ensures that the air pressure behind the air pump 130 does not exceed its preset operating pressure. The relief valve 140 can be either electronic or mechanical. Mechanical relief valves are more resilient to electronic control failures of the anesthesia machine. When the air pressure behind the air pump 130 exceeds the preset operating pressure, the relief valve 140 opens, and some of the air in the second fresh gas branch 40 is discharged to the atmosphere through the relief valve 140 to reduce the pressure. For an electronic relief valve, the preset operating pressure can be a system-preset value for pressure determination. For a mechanical relief valve, the preset operating pressure is the valve plate sealing pressure of the mechanical relief valve. When air pressure exceeds the valve-sealing pressure, the valve plate is pushed open, allowing gas to flow out of the relief valve. Second filter 150 further filters the air at the rear end of air pump 130. One-way valve 160 prevents backflow of gas and prevents gas in second fresh gas branch 40 from escaping from air pump 130 when air pump 130 is not activated.

[0067] The detection device 60 is used to detect a characteristic variable that represents the air flow characteristics of the second fresh gas branch 40. Specifically, this characteristic variable reflects the flow characteristics of the air in the second fresh gas branch 40. The flow characteristics may be flow rate, flow velocity, or pressure, and are related to the magnitude of the air flow in the second fresh gas branch 40. The characteristic variable may be the air flow itself or a factor that affects the air flow, as long as it reflects the air flow characteristics of the second fresh gas branch 40. This is not a limitation of the present invention.

[0068] The first fresh gas branch 30 and the second fresh gas branch 40 are connected to the anesthetic delivery device 70. For example, Figures 1 and 2 illustrate two connection methods. The anesthetic delivery device 70 can be used as an external device on the anesthesia machine, or it can be part of the anesthesia machine. The anesthetic delivery device 70 contains anesthetic and is used to mix the gas provided by the first fresh gas branch 30, the air provided by the second fresh gas branch 40, and the anesthetic to obtain a first mixed gas, which is then delivered to the breathing circuit 80. The gas provided by the first fresh gas branch 30 (such as oxygen and / or nitrous oxide) and the air provided by the second fresh gas branch 40 can be mixed in the anesthetic delivery device 70, or they can be mixed first and then mixed with the anesthetic in the anesthetic delivery device 70. This embodiment uses the latter as an example. As shown in Figure 2, the anesthesia machine also includes a third fresh gas branch 50. The third fresh gas branch 50 is used to mix the gas provided by the first fresh gas branch 30 and the air provided by the second fresh gas branch 40 to obtain a second mixed gas (such as an oxygen-air mixture, a nitrous oxide-air mixture, or a mixture of oxygen, nitrous oxide, and air). The anesthetic delivery device 70 is connected to the third fresh gas branch 50, and mixes the second mixed gas and the anesthetic to obtain a first mixed gas, and can also control the anesthetic concentration of the mixed first mixed gas. The anesthetic delivery device 70 may include a vaporizer.

[0069] The breathing circuit 80 is an air path connecting the anesthetic delivery device 70 and the patient, and is used to deliver the first mixed gas to the patient. The breathing circuit 80 can recycle the gas exhaled by the patient to save anesthetics and reduce environmental pollution. The breathing circuit 80 can include various connecting tubes and output ports. The output port can be various types of accessories. The accessories can be endotracheal tubes, endotracheal tubes with air bags at the end, etc. A gas purification device can be provided in the breathing circuit 80. The gas purification device is used to remove at least part of the carbon dioxide exhaled by the patient into the breathing circuit. For example, a CO2 absorbent (soda lime) can be provided in the gas purification device. The CO2 absorbent reacts with CO2 to achieve the purpose of removing CO2. At the same time, the reaction generates water and heat, which is conducive to maintaining the temperature and humidity of the patient's inhaled gas.

[0070] The ventilation control device 90 is used to control the breathing circuit 80 to deliver the first mixed gas to the patient through its output port, so that the anesthesia machine provides anesthetic breathing support for the patient, for example, controlling the breathing circuit 80 to periodically deliver the first mixed gas to the patient, so that the anesthesia machine provides periodic anesthetic breathing support for the patient. The ventilation control device 90 can automatically perform anesthetic ventilation control, or it can be performed manually (such as a balloon). For example, the ventilation control device 90 may include multiple valves and a board for driving the multiple valves. The board controls the multiple valves to periodically deliver the first mixed gas to the patient, thereby providing periodic anesthetic breathing support for the patient.

[0071] The processor 20 is configured to adjust the output capacity of the air compressing device 10, such as adjusting the air flow rate provided (output) by the air compressing device 10, based on the characteristic value output by the detection device 60. Adjusting the air flow rate output by the air compressing device 10 based on the air flow characteristics of the second fresh gas branch can assist in flow regulation and, secondly, allow the air compressing device 10 to operate at less than full capacity, thereby increasing the service life of the air compressing device, indirectly saving costs, and reducing noise generated by the use of the air compressing device 10.

[0072] As shown in FIG4 , the working process of the anesthesia machine provided by the present invention may include the following steps:

[0073] Step 1: After the anesthesia machine is started, the air compression device 10 is turned on, and each fresh gas branch is also connected. Each fresh gas branch provides corresponding fresh gas. Various fresh gases pass through the evaporator to add anesthetics and adjust the concentration to form a first mixed gas; the first mixed gas enters the breathing circuit 80, and the ventilation control device 90 performs ventilation control to deliver the first mixed gas to the patient. The waste gas exhaled by the patient is purified by the gas purification device and then discharged or recycled; during the above process, the anesthesia machine will also monitor the machine status and patient parameters to ensure patient safety and issue abnormal alarms.

[0074] Step 2: During operation of the anesthesia machine, the detection device 60 detects a characteristic variable representing the air flow characteristics of the second fresh gas branch 40 .

[0075] Step 3: The processor 20 adjusts the air flow provided by the air compression device 10 according to the characteristic quantity detected by the detection device 60.

[0076] A valve K can be installed on the second fresh gas branch 40 or the third fresh gas branch 50 to regulate air flow. There are two main methods: manual needle valve adjustment and solenoid valve control. Both methods adjust the flow rate by adjusting the diameter of the fresh gas branch. Depending on the flow rate adjustment method, the detection device 60 may also detect the characteristic variable in different ways. Several examples are provided below to illustrate this.

[0077] In the first embodiment, the anesthesia machine further includes a first valve disposed in the second fresh gas branch 40, such as the valve K in Figures 2 and 3. The first valve is used to adjust the air flow in the second fresh gas branch 40. As shown in Figure 5, step 3 may include the following steps:

[0078] Step 31: The processor 20 determines the current air flow rate of the second fresh gas branch 40. The processor 20 may obtain the current air flow rate directly from the detection device 60 or may calculate the current air flow rate indirectly based on the characteristic value. These two methods are described below.

[0079] In the first method, the characterizing quantity is the current air flow of the second fresh gas branch 40. For example, the detection device 60 includes a first flow sensor. The first flow sensor can be arranged in the second fresh gas branch 40. The first flow sensor is used to detect the current air flow of the second fresh gas branch 40, and the current air flow detected by the first flow sensor is used as the characterizing quantity. There are many monitoring principles of flow sensors, such as pressure difference, hot wire and ultrasound. The first flow sensor can be arranged in the second fresh gas branch 40. If the first valve adopts a solenoid valve, because the processor 20 needs to control the solenoid valve to set the air flow, the solenoid valve will be associated with the first flow sensor. Usually, the first flow sensor and the solenoid valve are arranged in the anesthesia machine in the form of a fully electronic flow meter. The processor 20 can receive the current air flow output by the first flow sensor to control the output capacity of the air compression device 10 (such as controlling the speed of the air pump 130).

[0080] In the second method, the characteristic value does not include the current air flow rate of the second fresh gas branch. The processor 20 obtains the current air flow rate of the second fresh gas branch 40 based on the characteristic value output by the detection device 60. For example, the anesthesia machine also includes an oxygen concentration sensor for detecting the oxygen concentration of the second mixed gas. The detection device 60 includes a second flow sensor. The second flow sensor is used to detect the flow rate of the gas provided by the first fresh gas branch 30 or the mixed gas flow rate of the second mixed gas provided by the third fresh gas branch 50.

[0081] If the gas provided by the first fresh gas branch does not contain nitrous oxide, such as the first fresh gas branch only provides oxygen, the processor 20 can calculate the current air flow of the second fresh gas branch 40 based on the oxygen concentration of the second mixed gas and the flow rate of oxygen provided by the first fresh gas branch, or based on the oxygen concentration of the second mixed gas and the flow rate of the second mixed gas provided by the third fresh gas branch, so as to adjust the output capacity of the air compression device 10 (such as adjusting the speed of the air pump 130).

[0082] The first method is simple and convenient, and this embodiment is described using the first method as an example. After the processor 20 obtains the current air flow, it can also store the current air flow at different times and display the current air flow through the human-computer interaction device so that the doctor can view and monitor the air flow.

[0083] In step 32, the processor 20 obtains the current flow rate setting value of the second fresh gas branch. In this embodiment, the anesthesia machine further includes a human-computer interaction device. The human-computer interaction device is used for human-computer interaction, for example, for displaying visual information and receiving user input. The device may include a display, a touch screen, buttons, a keyboard, a mouse, etc. The processor 20 may receive the flow rate setting value of the second fresh gas branch input by the user through the human-computer interaction device.

[0084] In step 33, the processor 20 adjusts the output capacity of the air compressing device 10 based on the difference between the current air flow rate of the second fresh gas branch and the current flow rate setting value. Specifically, when the current air flow rate is lower than the current flow rate setting value, the processor 20 increases the output capacity of the air compressing device 10 to increase the air flow rate, i.e., increases the air flow rate provided by the air compressing device. For example, the output capacity of the air compressing device is represented by the speed of the air pump 130. Specifically, the processor 20 increases the speed of the air pump 130. When the current air flow rate is higher than the current flow rate setting value, the processor 20 decreases the output capacity of the air compressing device 10 to decrease the air flow rate, i.e., decreases the air flow provided by the air compressing device, specifically, decreases the speed of the air pump 130.

[0085] The air pump 130 makes noise when working and has a problem with its service life. For the air pump 130 with adjustable speed, the higher the speed, the louder the noise and the shorter the service life. This embodiment adjusts the rotation speed of the air pump 130 according to the actual air fresh gas flow rate. It is easy to understand that a low speed can meet the requirements of a small flow rate, and a large air flow rate requires a higher air pump speed. In this case, the air pump 130 does not need to work at the highest speed (full load) under any circumstances. With the increasing attention paid to low-flow anesthesia today, the application of low-flow fresh gas is increasing, so in most cases, the air pump 130 only needs to work at a low speed. Obviously, this method can effectively increase the service life of the air pump 130 and reduce the working sound.

[0086] The processor 20 can simply adjust the output capacity of the air compression device 10 to make the difference between the current air flow rate and the current flow rate setting value approach 0 (i.e., adjust the air flow rate to the current flow rate setting value); or it can adjust both the first valve and the output capacity of the air compression device 10 to make the difference between the current air flow rate and the current flow rate setting value approach 0. This embodiment is explained using the latter as an example.

[0087] In this embodiment, the first valve is a solenoid valve, meaning that the processor 20 can control the opening of the first valve, eliminating the need for the physician to manually adjust the valve. Therefore, in step 32, after receiving the flow rate setpoint input by the user via the human-computer interface, the processor 20 controls the opening of the first valve to adjust the air flow in the second fresh gas branch 40 to the set flow rate.

[0088] After the doctor inputs a new flow rate setting value, the difference between the current air flow rate and the current (new) flow rate setting value will be relatively large. Therefore, the processor 20 can also adjust the opening of the first valve according to the difference between the current air flow rate and the current flow rate setting value. The processor 20 can first adjust the opening of the first valve and then adjust the output capacity of the air compression device 10. Specifically, when the current air flow rate is lower than the current flow rate setting value, the processor 20 increases the opening of the first valve as the primary measure to increase the air flow rate based on the difference between the current air flow rate and the current flow rate setting value (the difference at this time is relatively large), and then re-acquires the current air flow rate. The processor 20 increases the speed of the air pump 130 as a secondary measure to increase the air flow rate based on the difference between the re-acquired current air flow rate and the current flow rate setting value (because the valve opening has been adjusted, the difference at this time is relatively small). When the current air flow rate is higher than the current flow rate setting value, the processor 20 reduces the opening of the first valve as a primary measure to reduce the air flow rate based on the difference between the current air flow rate and the current flow rate setting value. The processor 20 then re-acquires the current air flow rate. Based on the difference between the re-acquired current air flow rate and the current flow rate setting value, the processor 20 reduces the speed of the air pump 130 as a secondary measure to reduce the air flow rate. This not only quickly adjusts the current air flow rate to the current flow rate setting value, but also improves the lifespan of the air pump. Of course, the processor can also adjust the opening of the first valve and the output capacity of the air compression device simultaneously. The processor may also first adjust the output capacity of the air compression device and then adjust the opening of the first valve. Specifically, when the current air flow rate is lower than the current flow rate setting value, the processor 20 increases the rotation speed of the air pump 130 as a primary measure to increase the air flow rate based on the difference between the current air flow rate and the current flow rate setting value (the difference is relatively large at this time), and then re-acquires the current air flow rate. The processor 20 increases the opening of the first valve as a secondary measure to increase the air flow rate based on the difference between the re-acquired current air flow rate and the current flow rate setting value (because the rotation speed has been adjusted, the difference is relatively small at this time). When the current air flow rate is higher than the current flow rate setting value, the processor 20 reduces the rotation speed of the air pump 130 to reduce the air flow rate based on the difference between the current air flow rate and the current flow rate setting value, and then re-acquires the current air flow rate and reduces the opening of the first valve to reduce the air flow rate based on the difference between the re-acquired current air flow rate and the current flow rate setting value.

[0089] In this embodiment, the anesthesia machine further includes a second valve disposed in the second fresh gas branch 40, such as valve K shown in Figures 2 and 3. The second valve is configured to allow the user to manually adjust the air flow in the second fresh gas branch 40. Compared to the solenoid valve in the first embodiment, which controls the air flow, the air flow in this embodiment requires manual adjustment by the physician.

[0090] A mechanical flow meter or an electronic flow meter (such as a flow sensor) can also be provided in the second fresh gas branch 40. Among them, the mechanical flow meter has an instrument that displays the flow rate, or has a glass tube that displays the flow rate. The flow rate is reflected by the position of the float in the glass tube, and there are corresponding scale values ​​on the glass tube to display the specific flow rate value. The doctor can adjust the second valve according to the real-time air flow detected by the mechanical flow meter and the patient's condition. There are many monitoring principles of flow sensors, including pressure difference, hot wire and ultrasound. The air flow rate can be monitored by the flow sensor, and the data can be transmitted to the processor 20. The processor 20 stores the data and displays the air flow rate through the display interface of the human-computer interaction device.

[0091] Since the control of the air flow is completely done manually by the doctor, the processor 20 cannot know the air flow that the doctor wants (corresponding to the flow setting value of the previous embodiment). Therefore, in this embodiment, the characterization quantity adopts the opening characterization quantity of the second valve. The processor 20 adjusts the air flow provided by the air compression device according to the change of the characterization quantity caused by the user manually adjusting the second valve, that is, obtains the changing trend of the opening characterization quantity according to the opening characterization quantity of the second valve; and then adjusts the air flow provided by the air compression device 10 according to the changing trend of the opening characterization quantity. Specifically, when the change of the opening characterization quantity represents an increase in the opening, that is, when the changing trend of the opening characterization quantity is an increase in the opening, it means that the doctor wants to increase the air flow, so the processor 20 increases the output capacity of the air compression device 10 to increase the air flow. When the change of the opening characterization quantity represents a decrease in the opening, that is, when the changing trend of the opening characterization quantity is a decrease in the opening, it means that the doctor wants to reduce the air flow, so the processor 20 lowers the output capacity of the air compression device 10 to reduce the air flow. In this way, it can not only assist in adjusting the air flow, but also reduce the workload of the air compression device 10 when low-flow air supply becomes a trend, thereby extending the service life of the air compression device 10.

[0092] From the above content, it can be seen that in this embodiment, it is particularly important that the detection device detects the opening characteristic quantity of the second valve, and then the processor adjusts the output capacity of the air compression device accordingly. There are many specific implementation methods, and several examples are given below for illustration.

[0093] In the first approach, the detection device 60 includes a first pressure sensor. The first pressure sensor can be positioned between the air compressor and the second valve, either near the rear end of the air compressor or near the second valve. Specifically, the first pressure sensor detects the air pressure in the second fresh gas branch 40 in front of the second valve. In other words, the air pressure detected by the first pressure sensor is the characteristic variable of the second valve opening. This approach does not require reference to air flow, so the anesthesia machine can use a mechanical flow meter to monitor air flow.

[0094] The processor 20 obtains the changing trend of the air pressure based on the air pressure at different times; when the changing trend of the air pressure is an increase in pressure, it means that the doctor has closed the second valve, so the processor 20 lowers the output capacity of the air compression device 10; when the changing trend of the air pressure is a decrease in pressure, it means that the doctor has opened the second valve, so the processor 20 increases the output capacity of the air compression device 10.

[0095] In this embodiment, adjusting the output capacity of the air compressing device 10 can be adjusting the speed of the air compressing device 10. For example, different air pressures can be pre-assigned to different speeds, and the air pressure is inversely proportional to the speed. The processor 20 increases and decreases the speed of the air compressing device 10, and the speed of the air compressing device 10 can be adjusted to the speed corresponding to the current air pressure. Since the higher the air pressure, the lower the speed, and the lower the air pressure, the higher the speed, the above-mentioned adjustment can be achieved. Of course, an interval control method can also be adopted, for example, different pressure intervals can be pre-assigned to different speeds, and the average air pressure of the pressure interval is inversely proportional to the corresponding speed, that is, the higher the pressure interval, the lower the speed, and the lower the pressure interval, the higher the speed. The processor 20 increases and decreases the speed of the air compressing device 10, and can obtain the pressure interval to which it belongs based on the current air pressure, and then adjust the speed of the air compressing device 10 to the speed corresponding to the pressure interval to which it belongs, and the above-mentioned adjustment can also be achieved.

[0096] Some anesthesia machines do not have flow sensors. In order to solve the problem of identifying the flow rate in this case, the present invention creatively identifies it by monitoring the pressure at the rear end of the air pump. When the fresh air flow rate is adjusted from small to large, the pressure at the rear end of the air pump will decrease; when the fresh air flow rate is adjusted from large to small, the pressure at the rear end of the air pump will increase. This method senses the user's adjustment of the fresh air flow rate by the change in the pressure at the rear end of the air pump. When it is detected that the required flow rate of fresh gas has increased, the air pump speed can be increased to meet the requirements; when it is detected that the required flow rate of fresh gas has decreased, the air pump speed can be reduced. Of course, this method is also applicable to anesthesia machines that adjust the fresh air flow rate through solenoid valve control (Example 1) and semi-electronic anesthesia machines (mechanically adjust the air flow rate, and use a flow sensor to monitor and display the air flow rate).

[0097] 6 , the detection device 60 includes a second pressure sensor P2, a third flow sensor 610, and a third pressure sensor P3. The second pressure sensor P2, the third flow sensor 610, and the third pressure sensor P3 are sequentially arranged on the second fresh gas branch 40.

[0098] The third flow sensor 610 is used to detect the air flow in the second fresh gas branch 40. The processor 20 also stores the air flow and displays it on the display interface of the human-computer interface device, facilitating monitoring of the air flow by the physician. The second valve can be positioned before or after the third flow sensor 610.

[0099] The second pressure sensor P2 is used to detect the air pressure of the second fresh gas branch in front of the second valve, that is, to detect the air pressure between the air compression device 10 and the second valve, that is, to detect the air pressure in front of the second valve.

[0100] The third pressure sensor P3 is used to detect the air pressure behind the second valve. Specifically, P2 and P3 are located before and after the second valve, respectively. This means the second valve is located between the second and third pressure sensors P2 and P3. Adjustments to the second valve's opening are reflected by the pressure difference between the second and third pressure sensors P2 and P3.

[0101] The air pressure detected by the second pressure sensor, the air flow detected by the third flow sensor, and the air pressure detected by the third pressure sensor can be used to calculate the opening characteristic of the second valve, which can be calculated by the opening calculation unit 620 of the detection device 60 or by the processor 20.

[0102] The opening calculation unit 620 or the processor 20 is used to receive the air flow detected by the third flow sensor 610, and the air pressure detected by the second pressure sensor P2 and the third pressure sensor P3; and calculate the opening characterization quantity of the second valve based on the air pressure detected by the second pressure sensor P2, the air flow detected by the third flow sensor 610, and the air pressure detected by the third pressure sensor P3. Specifically, the opening calculation unit 620 or the processor 20 subtracts the air pressure detected by the third pressure sensor P3 from the air pressure detected by the second pressure sensor P2 to obtain a pressure difference, and divides the pressure difference by the air flow F detected by the second flow sensor 610 to obtain the opening characterization quantity of the second valve. In other words, the opening calculation unit 620 or the processor 20 can calculate the opening characterization quantity R according to the following formula:

[0103] Among them, R is the opening characterization quantity, P2 is the air pressure detected by the second pressure sensor, P3 is the air pressure detected by the third pressure sensor, and F is the air flow detected by the third flow sensor 610.

[0104] After the second valve adjusts the air flow, this method uses the actual air flow and the resulting pressure change to calculate the opening of the second valve, and the result is accurate and reliable.

[0105] In the third method, the detection device 60 includes a third flow sensor. The third flow sensor can be set in the second fresh gas branch 40. The third flow sensor is used to detect the air flow of the second fresh gas branch 40. The opening characterizing quantity of the second valve is the air flow, or the air flow can be directly used as the characterizing quantity. When the air flow detected by the third flow sensor increases, the processor 20 increases the output capacity of the air compression device 10; when the air flow detected by the third flow sensor decreases, the processor 20 reduces the output capacity of the air compression device 10. The adjustment of the second valve opening and the adjustment of the air pump speed will affect the real-time air flow, so relying solely on the real-time air flow to adjust the air pump speed is not as accurate as the previous method.

[0106] In the fourth embodiment, the detection device 60 includes a displacement sensor or a gap sensor, which is used to detect the opening of the second valve and obtain an opening characteristic value.

[0107] Specifically, the displacement sensor detects the relative position change between the needle valve and the valve seat of the second valve to obtain the opening value. The gap sensor can be, for example, a grating that detects the gap between the needle valve and the valve seat of the second valve to obtain the opening value.

[0108] When the doctor uses the second valve of the needle valve structure to adjust the air flow, the relative position of the needle valve and the valve seat changes. A displacement sensor or a gap sensor is used to monitor the relative position of the two. When the relative position increases, it indicates that the valve opening has increased, and the processor 20 increases the output capacity of the air compressor 10. When the relative position decreases, it indicates that the valve opening has decreased, and the processor 20 reduces the output capacity of the air compressor 10. This method is also suitable for anesthesia machines that use mechanical flow meters to detect air flow.

[0109] Similarly, in this embodiment, the processor 20 can adjust the output capacity of the air compressing device 10 by adjusting the speed of the air compressing device 10, such as adjusting the speed of the air pump. In this embodiment, the various methods of adjusting the speed of the air pump can not only meet the demand for fresh air, but also reduce the noise level of the air pump operation, and at the same time increase the service life of the air pump.

[0110] In the above-described embodiment, the pressure of the gas supplied to the patient by the anesthesia machine is stable, and it is the flow rate of the gas supply that is regulated or varied. To maintain the stability of the gas supply pressure, regardless of the embodiment and the method of detecting the flow rate characteristic, the anesthesia machine can include a first pressure sensor (such as P0 in Figure 3). The first pressure sensor is used to detect the air pressure of the second fresh gas branch 40, that is, the air pressure at the rear end of the air compression device 10.

[0111] The air pressure in the second fresh gas branch is usually constant, for example, needs to be maintained at a preset target pressure, or the air pressure is usually stable in a range, for example, needs to be maintained in a preset target pressure range.

[0112] The target pressure and target pressure range can be set according to user needs or built into the system, which can ensure that when the air pressure is the target pressure or within the target pressure range, even if the first valve or the second valve is opened to the maximum, the corresponding air flow rate can exceed the preset minimum flow rate, and it can also ensure that no condensed water will appear in the second fresh gas branch.

[0113] When the air pressure detected by the first pressure sensor is lower than the preset target pressure, the processor 20 can increase the output capacity of the air compression device 10 to increase the air pressure so that the air pressure is maintained at the target pressure; when the air pressure detected by the first pressure sensor is higher than the preset target pressure, the processor 20 can decrease the output capacity of the air compression device 10 to reduce the air pressure so that the air pressure is maintained at the target pressure. When the air pressure detected by the first pressure sensor is lower than the lower limit of the target pressure range, the processor 20 increases the output capacity of the air compression device 10 to increase the air pressure so that the air pressure is within the target pressure range; when the air pressure detected by the first pressure sensor is higher than the upper limit of the target pressure range, the processor 20 decreases the output capacity of the air compression device 10 to reduce the air pressure so that the air pressure is within the target pressure range.

[0114] When the first pressure sensor at the rear end of the air compressor is used to adjust the air flow provided by the air compressor, the opening characterizing quantity is the air pressure detected by the first pressure sensor. In this case, when the change in the opening characterizing quantity (air pressure) indicates an increase in the opening, the processor increases the air flow provided by the air compressor; when the change in the opening characterizing quantity (air pressure) indicates a decrease in the opening, the processor decreases the air flow provided by the air compressor. In addition to controlling based on a target pressure or a target pressure range, the present invention can also directly adjust the air compressor based on changes in air pressure. When the air pressure decreases, the air flow provided by the air compressor is increased; when the air pressure increases, the air flow provided by the air compressor is decreased. For example, if the air pressure at the current moment decreases relative to the air pressure at the previous moment or the previous time interval, it is considered that the air pressure has decreased and the air flow provided by the air compressor needs to be increased. If the air pressure at the current moment increases relative to the air pressure at the previous moment or the previous time interval, it is considered that the air pressure has increased and the air flow provided by the air compressor needs to be decreased.

[0115] When the processor 20 adjusts the rotation speed of the air compressor 10, it can obtain the air pressure of the second fresh gas branch 40. When the air pressure is higher than the preset target pressure (such as the control target of the air pump), the rotation speed of the air compressor 10 needs to be reduced to reduce the output, and the pressure at the rear end of the air compressor 10 needs to be passively discharged through flow output. The inventors found that due to the inevitable presence of leakage of a certain size in the various components of the air compressor 10 and the anesthesia machine circuit, the pressure at the rear end of the air compressor 10 slowly decreases when the fresh gas regulating valve (the first valve and the second valve mentioned above) is closed or the opening is small. At this time, the pressure relief process at the rear end of the air compressor 10 is longer, and the air compressor 10 may reduce the rotation speed to zero and shut down. When the pressure is released below the target pressure, it is necessary to increase the rotation speed of the air compressor 10 to increase the rear end pressure. After the air compressor 10 is shut down, when the rear end pressure is lower than the target pressure, there is also a certain pressure at the rear end of the air compressor 10. If the air compressor 10 increases the speed from 0, since the output torque corresponding to the low speed is also small, the air compressor 10 needs a higher speed to restart. At this time, since the pressure at the rear end is small and it is easy to exceed the target pressure, the air compressor 10 will start and stop repeatedly. This phenomenon of repeated start and stop is easy to occur under such working conditions. The repeated start and stop of the air compressor 10 affects its service life and increases heat generation. Therefore, an adjustment range can be set for the speed of the air compressor 10 so that the processor 20 can only adjust the speed of the air compressor 10 within this adjustment range, that is, the processor 20 adjusts the speed of the air compressor 10 within a preset speed range. A minimum speed (the minimum value of the speed range) can be set to ensure that the air compressor 10 maintains the rear end pressure above the target pressure when the fresh air regulating valve is closed or the opening is small. This method can extend the service life of the air compressor 10 and reduce heat generation. It also solves the problem of insufficient output torque during startup under a certain back pressure, which may cause the pump to become stuck and unable to start. The minimum value of the speed range is preset. The principle is that the air compressor 10 will not shut down due to excessively slow speed when operating at the minimum speed range.

[0116] The inventors also discovered that because the output capacity of the air pump is not as good as that of pipeline gas, switching from pipeline gas to air pump supply may result in failure to reach the previous flow setting value, affecting the oxygen concentration and flow rate of the output fresh gas. Anesthesia machines that use solenoid valves to adjust the flow rate use solenoid valves to adjust to achieve the flow setting target. When the fresh air flow setting value is within the maximum output capacity of the air pump, switching from pipeline gas to the air pump does not affect the flow output. However, when the flow setting value exceeds the maximum output capacity of the air pump, switching from pipeline gas to the air pump affects the oxygen concentration and flow rate of the output fresh gas. For anesthesia machines that use a manual needle valve to adjust the flow rate, if the switch is made from pipeline gas to air pump supply, the fixed needle valve opening will inevitably cause the output fresh gas flow rate to change, and the same is true when switching back from the air pump to pipeline gas supply.

[0117] Therefore, when the current air source type for providing air is switched from an air interface to an air compressor, the processor 20 can display a corresponding prompt message through the human-computer interaction device, thereby prompting the doctor that the air supply has been changed to that provided by the air compressor. Similarly, when the current air source type for providing air is switched from an air compressor to an air interface, the processor 20 can also display a corresponding prompt message through the human-computer interaction device. In this way, the doctor will pay more attention to possible changes in air flow with the prompt message, and make corresponding adjustments to avoid large fluctuations in air flow. Among them, the air source type is divided into two types: air interface and air compressor.

[0118] The processor 20 can determine whether the gas source type has been switched in a variety of ways. For example, when the processor 20 detects that the air compression device 10 is turned on and the anesthesia machine is in working condition, it determines that the gas source type has been switched from the air interface to the air compression device. For another example, a pressure sensor or a flow sensor is provided at the air interface, and the processor 20 determines whether the gas source type has been switched by the change in the value detected by the pressure sensor or the flow sensor. For example, when the change in the value is from a value exceeding a preset value to 0 (indicating that the air interface is disconnected from the hospital pipeline), and the anesthesia machine is in working condition (for example, when the air compression device 10 is turned on), it is determined that the gas source type has been switched from the air interface to the air compression device. The preset value is a value greater than 0, which is used to exclude pressure or flow changes caused by wind, and it can be slightly greater than 0.

[0119] The processor 20 may display the corresponding prompt information through the human-computer interaction device in a variety of ways, several of which are described below.

[0120] In one embodiment, the processor 20 displays the type of air source currently providing air through the human-computer interaction device. For example, if the air compressor 10 is turned on, it indicates that the type of air source currently providing air is an air compressor. If the value detected by the pressure sensor or flow sensor at the air interface is greater than a preset value, it indicates that the type of air source currently providing air is an air interface. This prompt method is simple and direct.

[0121] In the solution of the first embodiment described above, the first valve is typically a solenoid valve. After switching to the air compressor 10 for air supply, since the physician has set a flow rate setpoint, even if the flow rate changes, the processor 20 can automatically adjust the first valve based on the flow rate setpoint to maintain the air flow rate at the flow rate setpoint. In the solution of the second embodiment described above, the second valve is manually controlled. Therefore, after the air source type is switched, the processor 20 can further prompt the user to adjust the second valve through the human-computer interaction device. The physician can promptly adjust the second valve based on possible flow rate changes, thereby avoiding adverse effects caused by the switching of the air source type.

[0122] In the second embodiment, after displaying the corresponding prompt information via the human-computer interaction device, the processor 20 can also determine whether the opening value of the second valve has changed. If the opening value has changed, it indicates that the doctor has viewed the prompt information and subsequently adjusted the second valve, thus achieving the purpose of the prompt. When the opening value of the second valve changes, the processor 20 cancels the display of the prompting the user to adjust the second valve. This eliminates the need for the doctor to manually close the prompt information, making the entire process automated and intelligent, and very convenient.

[0123] In the solution of the second embodiment, if the detection device uses a flow sensor to detect the current air flow of the second fresh gas branch 40, that is, the processor 20 detects the air flow through the flow sensor, and displays the current air flow (real-time air flow) detected by the flow sensor through the human-computer interaction device. Then the processor 20 displays the corresponding prompt information through the human-computer interaction device. Specifically, the air flow detected by the flow sensor before and after the second valve is adjusted can be displayed differentially on the interface of the human-computer interaction device displaying the air flow detected by the flow sensor, such as changing the display color of the current air flow, highlighting the current air flow, etc. In short, the current air flow can be displayed more prominently. The doctor monitors the air flow provided by the second fresh gas branch through the real-time air flow on the display interface. When he sees that the display method of the air flow has changed, he knows that the gas source type has switched and the second valve may need to be adjusted. This prompt method does not take up extra space on the display interface.

[0124] In another way, in the solution of embodiment 1, the processor 20 will record the flow setting value. After the current air source type for providing air is switched from the air interface to the air compressor, the difference between the maximum output flow of the air compressor 10 and the target flow setting value is judged based on the target flow setting value when the air source type is the air interface (usually the current flow setting value). When the maximum output flow is less than the target flow setting value, the user is prompted to switch back from the air compressor to the air interface through the human-computer interaction device. The maximum output flow of the air compressor 10 is the flow that the air compressor 10 can provide when it works at its maximum output capacity (such as the maximum speed), and is pre-set. In other words, when the air pump cannot provide the flow of the target flow setting value even when working at the maximum speed, the processor 20 reminds the user to switch back to the pipeline air supply to ensure high-flow air supply.

[0125] The above embodiments all use valves to control the air flow. The following provides an embodiment in which the air flow of the second fresh gas branch is directly controlled by the air compression device 10.

[0126] As shown in Figures 1 and 2, the anesthesia machine provided in this embodiment includes the first fresh gas branch 30 as described above, the second fresh gas branch 40, the third fresh gas branch 50 as described above, the detection device 60 as described above, the anesthetic delivery device 70 as described above, the breathing circuit 80 as described above, the ventilation control device 90 as described above, the human-computer interaction device as described above, and the processor 20.

[0127] In this embodiment, no valve for adjusting the air flow is provided on the second fresh gas branch 40 , and the rest is the same as the second fresh gas branch 40 of the above embodiment, which will not be described in detail here.

[0128] In addition to the functions mentioned in the above embodiments, the human-computer interaction device is also used to receive a target flow setting value input by a user.

[0129] In addition to the functions mentioned in the above embodiments, the processor 20 is also used to adjust the output capacity of the air compressing device 10 (such as adjusting the air flow rate provided by the air compressing device 10) according to the target flow rate setting value. For example, the flow rate corresponding to the different output capacities of the air compressing device 10 is pre-calculated to obtain the corresponding relationship between the flow rate and the output capacity. Then, the processor 20 adjusts the output capacity of the air compressing device 10 to the output capacity corresponding to the target flow rate setting value according to the target flow rate setting value, thereby completing the setting of the air flow rate. The processor 20 can specifically adjust the output capacity of the air compressing device 10 by controlling the input voltage of the air compressing device 10. For example, the corresponding relationship between different input voltages and the output capacity of the air compressing device (such as the rotational speed) is obtained in advance, thereby obtaining the corresponding relationship between the flow rate and the input voltage. The processor 20 applies the input voltage corresponding to the target flow rate setting value to the air compressing device 10 according to the target flow rate setting value, thereby controlling the output capacity of the controller, such as controlling its rotational speed.

[0130] The detection device 60 follows the adjustment of the output capacity of the air compression device 10 and outputs the changing air flow value. For example, the detection device 60 detects the air flow of the second fresh gas branch 40 in real time and displays the air flow through the human-computer interaction device, so that the doctor can monitor the air flow in real time.

[0131] The anesthesia machine usually detects the oxygen and / or nitrous oxide on the first fresh gas branch and displays it on the display interface of the human-computer interaction device. The air flow can be displayed together with the flow of oxygen and / or nitrous oxide. Considering the particularity of the air source type switching, the air flow can also be displayed independently of the flow of oxygen and / or nitrous oxide, so that the doctor can monitor the air flow more attentively.

[0132] The ventilation control device 90 controls the breathing circuit 80 to deliver the first mixed gas to the patient, specifically via a driving gas. In the prior art, driving gas also comes from pipeline gas or gas cylinders. In the present invention, however, the driving gas can be sourced from the aforementioned air compression device 10 or from another air compression device. Examples are provided below to illustrate each of these.

[0133] As shown in Figure 7, in one embodiment, the air provided by the air compressor 10 can also be used as driving gas for the anesthesia machine. For example, the ventilation control device 90 includes a driving gas branch 910. One end of the driving gas branch 910 is connected to the air compressor 10, thereby receiving air from the air compressor 10. The other end of the driving gas branch 910 is connected to the breathing circuit 80. The driving gas branch 910 is used to use the air provided by the air compressor 10 as driving gas to periodically drive the breathing circuit 80 to deliver the first mixed gas to the patient.

[0134] Specifically, the breathing circuit 80 may include an expiratory branch 810, an inspiratory branch 820, and a gas purification device 830. One end of the inspiratory branch 820 is connected to the output end of the anesthetic delivery device 70, thereby receiving the first mixed gas output by the anesthetic delivery device 70. The other end of the inspiratory branch 820 is used to connect to the patient and is also connected to one end of the expiratory branch 810. The other end of the expiratory branch 810 is connected to the driving gas branch 910 and one end of the gas purification device 830. The other end of the gas purification device 830 is connected to one end of the inspiratory branch 820. During the exhalation phase, gas exhaled by the patient passes through the exhalation branch 810 and is stored in the driving gas branch 910. During the inhalation phase, the driving gas branch 910 controls the driving gas to drive the exhaled gas stored in the driving gas branch 910 into the gas purification device 830. For example, a valve provided in the driving gas branch 910 is opened, so that the air output by the air compressor 10 can serve as the driving gas to drive the exhaled gas stored in the driving gas branch 910 into the gas purification device 830. The gas purification device 830 removes at least a portion of the carbon dioxide in the exhaled gas. After the exhaled gas merges with the first mixed gas, it enters the inhalation branch 820 driven by the driving gas, and the purified exhaled gas and the first mixed gas are delivered to the patient.

[0135] The driving gas branch 910 may include a bellows, which comprises a housing and a pleated bladder located within the housing. A cavity is defined between the housing and the pleated bladder. The pleated bladder is used to store exhaled gas from the patient. During exhalation, the patient's exhaled gas enters the pleated bladder for storage. As the pleated bladder stores more gas, it expands, reducing the volume of the cavity. During inspiration, driving gas enters the cavity, increasing the pressure within the cavity and squeezing the exhaled gas stored in the pleated bladder into the breathing circuit 80.

[0136] Of course, a volume reflector can be used instead of a bellows. That is, the driving gas branch 910 can include a volume reflector. The volume reflector can be a long, thin tube that can be bent into various shapes, such as a disk, to save space. The purpose of using a long, thin tube is to minimize the entry of driving gas into the breathing circuit 80. The volume reflector is used to store gas exhaled by the patient. During the exhalation phase, the patient's exhaled gas enters the volume reflector for storage. During the inhalation phase, the driving gas enters the volume reflector, thereby squeezing the exhaled gas stored in the volume reflector into the breathing circuit 80.

[0137] The ventilation control device 90 may further include a gas exhaust branch 920 , which is used to exhaust excess gas during the exhalation phase.

[0138] In one embodiment, the air output by the air compression device 10 can be pressure-regulated for use as fresh gas and drive gas. For example, the air compression device 10 is connected to one end of the second fresh gas branch and one end of the drive gas branch 910 via a pressure-regulating valve. Of course, in some embodiments, pressure-regulating valves can be provided in both the second fresh gas branch and the drive gas branch 910.

[0139] In the embodiment shown in Figure 8, the driving gas is provided by another air compression device 10'. For example, the ventilation control device 90 includes a driving gas branch 910. The anesthesia machine also includes another air compression device 10'. The other air compression device 10' is used to provide air. Its structure and function are described in the air compression device in the aforementioned embodiment and are not described here. One end of the driving gas branch 910 is connected to the other air compression device 10', and the other end of the driving gas branch 910 is connected to the breathing circuit 80. The driving gas branch 910 is used to use the air provided by the other air compression device 10' as the driving gas to periodically drive the breathing circuit 80 to deliver the first mixed gas to the patient.

[0140] The specific structure and connection relationship of the ventilation control device 90 and the breathing circuit 80 are basically the same as those of the embodiment shown in Figure 7. The only difference is that the air compression device connected to the driving gas branch 910 is different, so they are not described here.

[0141] The air compressing devices 10 and 10 ′ may be one of a turbine, an air pump, and an air compressor. For example, the air compressing device 10 may include an air pump, and the other air compressing device 10 ′ may include a turbine.

[0142] In some embodiments, the anesthesia machine provided by the present invention may include, as shown in FIG9 , the first fresh gas branch 30 described above, the second fresh gas branch 40 described above, and the breathing circuit 80 described above. The first fresh gas branch 30 is used to provide oxygen and / or nitrous oxide. The second fresh gas branch 40 is connected to an air compressor for providing air.

[0143] The anesthesia machine may further include a drive gas branch 910. One end of the drive gas branch 910 is connected to the air compressor 10, and the other end is connected to the breathing circuit 80. The drive gas branch 910 utilizes air provided by the air compressor 10 as drive gas to periodically drive the breathing circuit 80 and deliver the first mixed gas to the patient. The specific process is similar to the embodiment shown in FIG7 and is not further described here.

[0144] The anesthesia machine may further include the processor 20 and human-computer interaction device as described above, as shown in the aforementioned embodiment. Of course, the anesthesia machine may also include the third fresh gas branch 50 as described above, and its specific functions and connection relationships are shown in the aforementioned embodiment and will not be described in detail here.

[0145] In yet another embodiment, the anesthesia machine provided by the present invention may include, as shown in Figure 10, the first fresh gas branch 30 described above, the second fresh gas branch 40 described above, and the breathing circuit 80 described above. The first fresh gas branch 30 is used to provide oxygen and / or nitrous oxide. The second fresh gas branch 40 is connected to a first air compressor for providing air. The functions of the first air compressor are similar to those of the air compressor 10 in the aforementioned embodiment and are not further described here.

[0146] The anesthesia machine may further include a driving gas branch 910 and a second air compression device. The second air compression device is also used to provide air. The function of the second air compression device 10' is the same as the other air compression device 10' in the aforementioned embodiment, and will not be described in detail here. Among them, one end of the driving gas branch 910 is connected to the second air compression device, and the other end is connected to the breathing circuit 80. The driving gas branch 910 is used to use the air provided by the second air compression device as the driving gas to periodically drive the breathing circuit 80 to deliver the first mixed gas to the patient. The specific process is the same as the embodiment shown in Figure 8 and will not be described in detail here.

[0147] It can be seen that in the anesthesia machine shown in Figures 7-10, even the driving gas can be generated by the anesthesia machine itself, thereby replacing the air cylinder, reducing management risks, and increasing the scope of application of the anesthesia machine, making it more convenient to use.

[0148] This document is described with reference to various exemplary embodiments. However, those skilled in the art will recognize that changes and modifications may be made to the exemplary embodiments without departing from the scope of this document. For example, the various operational steps and components used to perform the operational steps may be implemented in different ways (e.g., one or more steps may be deleted, modified, or incorporated into other steps) depending on the specific application or considering any number of cost functions associated with the operation of the system.

[0149] Additionally, as will be appreciated by those skilled in the art, the principles of this disclosure may be embodied in a computer program product on a computer-readable storage medium pre-loaded with computer-readable program code. Any tangible, non-transitory computer-readable storage medium may be used, including magnetic storage devices (hard disks, floppy disks, etc.), optical storage devices (CD-ROMs, DVDs, Blu-ray discs, etc.), flash memory, and / or the like. These computer program instructions may be loaded onto a general-purpose computer, a special-purpose computer, or other programmable data processing device to form a machine, such that the instructions executed on the computer or other programmable data processing device may generate a device that implements a specified function. These computer program instructions may also be stored in a computer-readable memory, which may instruct the computer or other programmable data processing device to operate in a specific manner, such that the instructions stored in the computer-readable memory may form an article of manufacture that includes an implementation device that implements a specified function. The computer program instructions may also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, such that the instructions executed on the computer or other programmable device may provide the steps for implementing the specified function.

[0150] Although the principles of this invention have been shown in various embodiments, many modifications of structure, arrangement, proportion, elements, materials and components that are particularly suitable for specific environments and operational requirements can be used without departing from the principles and scope of this invention. The above modifications and other changes or amendments are intended to be included within the scope of this invention.

[0151] The foregoing detailed description has been described with reference to various embodiments. However, those skilled in the art will recognize that various modifications and changes can be made without departing from the scope of this disclosure. Therefore, the present disclosure will be considered in an illustrative rather than a restrictive sense, and all such modifications will be included within its scope. Similarly, the advantages, other advantages and solutions to the problems of the various embodiments have been described above. However, the benefits, advantages, solutions to the problems and any elements that can produce these, or make them more specific, should not be interpreted as critical, required or necessary. The term "comprising" and any other variants used in this article are all non-exclusive inclusions, so that a process, method, article or device that includes a list of elements includes not only these elements, but also other elements that are not explicitly listed or do not belong to the process, method, system, article or device. In addition, the term "coupled" and any other variants used in this article refer to physical connections, electrical connections, magnetic connections, optical connections, communication connections, functional connections and / or any other connections.

Claims

1. An anesthesia machine, characterized in that: include: A first fresh gas branch for providing oxygen and / or laughing gas; The second fresh gas branch is connected to an air compressor for providing air; the air flow rate provided by the air compressor is adjustable; The first fresh gas branch and the second fresh gas branch are both connected to an anesthetic delivery device, and the anesthetic delivery device is used to mix anesthetic, oxygen and / or nitrous oxide provided by the first fresh gas branch, and air provided by the second fresh gas branch to obtain a first mixed gas; a breathing circuit, for receiving the first mixed gas output by the anesthetic delivery device, and delivering the first mixed gas to a patient; A detection device, used to detect a characteristic quantity characterizing air flow characteristics of the second fresh gas branch; as well as The processor is used to adjust the air flow provided by the air compression device according to the characterization quantity output by the detection device.

2. The anesthesia machine according to claim 1, characterized in that: When the characterizing amount is the current air flow of the second fresh gas branch, the processor adjusts the air flow provided by the air compression device according to the characterizing amount output by the detection device, including: obtaining a current flow setting value of the second fresh gas branch; and adjusting the air flow provided by the air compression device according to a difference between the current air flow and the current flow setting value; or, When the characterization quantity does not include the current air flow of the second fresh gas branch, the processor adjusts the air flow provided by the air compression device according to the characterization quantity output by the detection device, including: obtaining the current air flow of the second fresh gas branch according to the characterization quantity output by the detection device; obtaining the current flow setting value of the second fresh gas branch; and adjusting the air flow provided by the air compression device according to the difference between the current air flow and the current flow setting value.

3. The anesthesia machine according to claim 2, characterized in that: The adjusting the air flow provided by the air compression device comprises adjusting the rotation speed of the air compression device; the detection device comprises a first flow sensor, and the first flow sensor is used to detect the current air flow of the second fresh gas branch; The current air flow rate detected by the first flow sensor is used as the characterizing quantity; The processor obtains the current air flow detected by the first flow sensor to adjust the rotation speed of the air compression device.

4. The anesthesia machine according to claim 2, characterized in that: It also includes a third fresh gas branch and an oxygen concentration sensor; the first fresh gas branch is used to provide oxygen; the third fresh gas branch is used to mix the oxygen provided by the first fresh gas branch and the air provided by the second fresh gas branch to obtain a second mixed gas; the oxygen concentration sensor is used to detect the oxygen concentration of the second mixed gas; the detection device includes a second flow sensor, and the second flow sensor is used to detect the flow of oxygen provided by the first fresh gas branch or the flow of the second mixed gas provided by the third fresh gas branch; adjusting the air flow provided by the air compression device includes adjusting the rotation speed of the air compression device; The processor is used to obtain the current air flow of the second fresh gas branch according to the oxygen concentration of the second mixed gas and the flow rate of the oxygen or according to the oxygen concentration of the first mixed gas and the flow rate of the first mixed gas, so as to adjust the rotation speed of the air compression device.

5. The anesthesia machine according to claim 2, characterized in that: The processor adjusts the air flow provided by the air compression device according to the difference between the current air flow and the current flow setting value, including: When the current air flow rate is lower than the current flow rate setting value, increasing the air flow rate provided by the air compression device; and / or, When the current air flow rate is higher than the current flow rate setting value, the air flow rate provided by the air compression device is reduced.

6. The anesthesia machine according to claim 2, characterized in that: Also includes a human-computer interaction device; the processor obtains the current flow setting value, including: The flow setting value input by the user is received through the human-machine interaction device.

7. The anesthesia machine according to claim 2, characterized in that: The system further includes a first valve disposed in the second fresh gas branch, wherein the first valve is used to adjust the air flow of the second fresh gas branch; and the processor is further used to: According to the difference between the current air flow rate and the current flow rate setting value, the opening of the first valve is first adjusted, and then the air flow rate provided by the air compression device is adjusted; or, Simultaneously adjusting the opening of the first valve and the air flow provided by the air compression device according to the difference between the current air flow and the current flow setting value; or, According to the difference between the current air flow rate and the current flow rate setting value, the air flow rate provided by the air compression device is first adjusted, and then the opening of the first valve is adjusted.

8. The anesthesia machine according to claim 1, characterized in that: The first valve is an electromagnetic valve.

9. The anesthesia machine according to claim 1, characterized in that: Also includes: a second valve provided in the second fresh gas branch, for supporting a user to manually adjust the air flow of the second fresh gas branch; The processor adjusts the air flow provided by the air compression device according to the characterization quantity output by the detection device, including: The air flow provided by the air compression device is adjusted according to the change of the characteristic quantity caused by the user manually adjusting the second valve.

10. The anesthesia machine according to claim 9, characterized in that: The detection device includes a third flow sensor; the third flow sensor is used to detect the current air flow of the second fresh gas branch; the characterization quantity is the current air flow of the second fresh gas branch; preferably, the processor adjusts the air flow provided by the air compression device according to the change of the characterization quantity caused by the user manually adjusting the second valve, including: when the air flow detected by the third flow sensor increases, increasing the air flow provided by the air compression device; when the air flow detected by the third flow sensor decreases, decreasing the air flow provided by the air compression device.

11. The anesthesia machine according to claim 9, characterized in that: The characterization quantity includes the characterization quantity of the opening of the second valve; the processor adjusts the air flow provided by the air compression device according to the change of the characterization quantity caused by the user manually adjusting the second valve, including: When the change in the opening characterizing amount represents an increase in the opening, the air flow rate provided by the air compressing device is increased; when the change in the opening characterizing amount represents a decrease in the opening, the air flow rate provided by the air compressing device is decreased.

12. The anesthesia machine according to claim 11, characterized in that: The detection device comprises a first pressure sensor, and the first pressure sensor is used to detect the air pressure of the second fresh gas branch at the front end of the second valve; the opening characterizing quantity of the second valve is the air pressure; preferably, when the change of the opening characterizing quantity represents an increase in the opening, the processor increases the air flow provided by the air compression device; When the change in the opening characterizing amount represents a decrease in the opening, lowering the air flow rate provided by the air compressing device comprises: When the air pressure is lower than the target pressure, the air flow rate provided by the air compression device is increased; when the air pressure is higher than the target pressure, the air flow rate provided by the air compression device is decreased; Alternatively, when the air pressure decreases, the air flow rate provided by the air compression device is increased; when the air pressure increases, the air flow rate provided by the air compression device is decreased.

13. The anesthesia machine according to claim 11, characterized in that: The detection device includes a second pressure sensor, a third flow sensor and a third pressure sensor; the third flow sensor is used to detect the air flow of the second fresh gas branch; the second pressure sensor is used to detect the air pressure of the second fresh gas branch at the front end of the second valve; the third pressure sensor is used to detect the air pressure of the second fresh gas branch at the rear end of the second valve; the air pressure detected by the second pressure sensor, the air flow detected by the third flow sensor and the air pressure detected by the third pressure sensor can be used to calculate the opening characterizing quantity of the second valve.

14. The anesthesia machine according to claim 11, characterized in that: The detection device includes a displacement sensor or a gap sensor, and the displacement sensor or the gap sensor is used to detect the opening of the second valve to obtain the opening characterizing quantity.

15. The anesthesia machine according to claim 1, characterized in that: It also includes an air interface and a human-machine interaction device; the air interface is used to receive air provided from the outside, and one of the air interface and the air compression device is connected to the second fresh gas branch; the processor is also used to: When the type of air source currently providing air is switched from an air interface to an air compression device and / or from an air compression device to an air interface, corresponding prompt information is displayed through the human-computer interaction device; wherein the air source type is divided into two types: an air interface and an air compression device.

16. The anesthesia machine according to claim 15, characterized in that: The processor displays corresponding prompt information through the human-computer interaction device, including: Displaying the type of air source currently providing air through the human-machine interaction device; and / or, After the current air source type providing air is switched from the air interface to the air compression device, based on the target flow setting value when the air source type is the air interface, when it is determined that the maximum output flow of the air compression device is less than the target flow setting value, the human-computer interaction device prompts the user to switch from the air compression device back to the air interface.

17. The anesthesia machine according to claim 15, characterized in that: Also comprising a second valve, for supporting a user to manually adjust the air flow of the second fresh gas branch; The processor displays corresponding prompt information through the human-computer interaction device, including: prompting the user to adjust the second valve through the human-computer interaction device.

18. The anesthesia machine according to claim 17, characterized in that: The flow characterization quantity includes the opening characterization quantity of the second valve; and the processor is further used for: It is determined whether the opening characterizing quantity of the second valve has changed, and when the opening characterizing quantity of the second valve has changed, the information prompting the user to adjust the second valve is automatically cancelled.

19. The anesthesia machine according to claim 18, characterized in that: The detection device comprises a first flow sensor; the first flow sensor is used to detect the air flow of the second fresh gas branch; The processor displays corresponding prompt information through the human-computer interaction device, including: differentially displaying the air flow detected by the first flow sensor before and after the second valve is adjusted.

20. An anesthesia machine, characterized in that: include: A first fresh gas branch for providing oxygen and / or laughing gas; The second fresh gas branch is connected to an air compressor for providing air; the air flow rate provided by the air compressor is adjustable; The first fresh gas branch and the second fresh gas branch are both connected to an anesthetic delivery device, and the anesthetic delivery device is used to mix anesthetic, oxygen and / or nitrous oxide provided by the first fresh gas branch, and air provided by the second fresh gas branch to obtain a first mixed gas; a breathing circuit, for receiving the first mixed gas provided by the anesthetic delivery device; a ventilation control device, used for controlling the breathing circuit to deliver the first mixed gas to the patient, thereby providing anesthesia breathing support for the patient; A human-computer interaction device, used for receiving a target flow setting value input by a user; The processor is used to adjust the air flow provided by the air compression device according to the target flow setting value.

21. The anesthesia machine according to claim 20, characterized in that: No valve for adjusting the air flow is provided on the second fresh gas branch; the anesthesia machine also includes a detection device, which is used to detect the air flow of the second fresh gas branch; the detection device follows the adjustment of the output capacity of the air compression device and outputs the changing air flow value.

22. The anesthesia machine according to any one of claims 1 to 21, characterized in that: The processor adjusts the air flow provided by the air compression device by controlling the input voltage of the air compression device.

23. The anesthesia machine according to any one of claims 1 to 21, characterized in that: The air compression device is built into the housing of the anesthesia machine.

24. The anesthesia machine according to any one of claims 1 to 21, characterized in that: The air compression device comprises an air pump with adjustable speed, and the air pump is used to compress the air entering the air inlet and then output it; The anesthesia machine further comprises an air inlet, and a first filter is arranged between the air inlet and the air pump; the first filter is used to filter the air entering from the air inlet; preferably, the second fresh gas support The air pump is provided with a second filter, and the second filter is used to filter the air output by the air pump.

25. The anesthesia machine according to claim 24, characterized in that: A normally closed pressure relief branch is arranged on the second fresh gas branch, and the normally closed pressure relief branch includes a normally closed overflow valve; the normally closed overflow valve is arranged at the rear end of the air pump, and is used for opening the normally closed pressure relief branch when the air pressure of the second fresh gas branch is higher than the working pressure, so that the air on the second fresh gas branch can flow out from the normally closed pressure relief branch.

26. The anesthesia machine according to any one of claims 1 to 21, characterized in that: Adjusting the air flow provided by the air compression device includes adjusting the rotational speed of the air compression device; the processor adjusts the rotational speed of the air compression device within a preset rotational speed range; when the air compression device operates at the minimum value of the rotational speed range, it will not shut down due to too slow a rotational speed.

27. An anesthesia machine, characterized in that: include: A first fresh gas branch for providing oxygen and / or laughing gas; The second fresh gas branch is connected to an air compressor for providing air; the air flow rate provided by the air compressor is adjustable; a second valve, used to support a user to manually adjust the air flow of the second fresh gas branch; The first fresh gas branch and the second fresh gas branch are both connected to an anesthetic delivery device, and the anesthetic delivery device is used to mix anesthetic, oxygen and / or nitrous oxide provided by the first fresh gas branch, and air provided by the second fresh gas branch to obtain a first mixed gas; a breathing circuit, for receiving the first mixed gas output by the anesthetic delivery device, and delivering the first mixed gas to a patient; A detection device, used to detect a characteristic value of the opening of the second valve; as well as The processor is used to adjust the output capacity of the air compression device according to the change of the opening characterizing quantity.

28. The anesthesia machine according to claim 1, 20 or 27, characterized in that: The anesthesia machine further comprises a driving gas branch, one end of which is connected to the air compression device, and the other end of which is connected to the breathing circuit; the driving gas branch is used to use the air provided by the air compression device as driving gas to periodically drive the breathing circuit to deliver the first mixed gas to the patient; or, The anesthesia machine also includes a driving gas branch and another air compression device, one end of the driving gas branch is connected to the other air compression device, and the other end is connected to the breathing circuit; the driving gas branch is used to use the air provided by the other air compression device as the driving gas, and periodically drive the breathing circuit to deliver the first mixed gas to the patient.

29. An anesthesia machine, characterized in that: include: A first fresh gas branch for providing oxygen and / or laughing gas; The second fresh gas branch is connected to an air compressor for providing air; The first fresh gas branch and the second fresh gas branch are both connected to an anesthetic delivery device, and the anesthetic delivery device is used to mix anesthetic, oxygen and / or nitrous oxide provided by the first fresh gas branch, and air provided by the second fresh gas branch to obtain a first mixed gas; A breathing circuit, used for receiving the first mixed gas output by the anesthetic delivery device; Driving gas branch; One end of the driving gas branch is connected to the air compression device, and the other end is connected to the breathing circuit; the driving gas branch is used to use the air provided by the air compression device as the driving gas, and periodically drive the breathing circuit to deliver the first mixed gas to the patient; or, the anesthesia machine also includes another air compression device, one end of the driving gas branch is connected to the other air compression device, and the other end is connected to the breathing circuit; the driving gas branch is used to use the air provided by the other air compression device as the driving gas, and periodically drive the breathing circuit to deliver the first mixed gas to the patient.

30. The anesthesia machine according to claim 29, characterized in that: The air compression device includes a turbine, an air pump or an air compressor.

31. The anesthesia machine according to claim 30, characterized in that: The air compression device comprises an air pump, and the other air compression device comprises a turbine.

32. The anesthesia machine according to claim 30, characterized in that: The air compression device is connected to one end of the second fresh gas branch and the driving gas branch respectively through a pressure regulating valve; or The second fresh gas branch and the driving gas branch are both provided with pressure regulating valves.

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