Expiratory valve assembly for anaesthesia machine and anaesthesia machine

Abstract

The invention relates to the technical field of medical instruments, in particular to an exhalation valve assembly for an anaesthesia machine and the anaesthesia machine. The exhalation valve assembly for the anesthesia machine comprises an exhalation valve shell (1), a driving gas device (5), an exhalation valve (7), a waste gas connecting pipe (12) and a plurality of driving gas connecting pipes (9 and 10), a driving gas pipeline (3) is arranged in the exhalation valve shell (1), and the exhalation valve shell (1) is provided with a second driving gas connector (6), a third driving gas connector (15), an exhalation valve mounting port (16), a waste gas pipeline connector (11), a loop connector (17) and other connectors. Therefore, the communication with an exhalation valve (7), a waste gas pipeline and an anaesthesia machine loop is realized. The exhalation valve (7) and the safety valve assembly (14) are integrated, connecting and sealing points are reduced, and the leakage risk is reduced. The exhalation valve assembly is compact in structure, uniform in connector, capable of supporting modular assembly and convenient to maintain. The device has the advantages of high integration, high sealing performance, low cost, high reliability and the like, and is suitable for modern anesthesia systems.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to an expiratory valve assembly for an anesthesia machine and an anesthesia machine. BACKGROUND

[0002] Anesthesia machines are key devices widely used in clinical anesthesia processes, used to maintain anesthetic states and ensure effective management of patient respiratory functions. The expiratory valve in the anesthesia machine circuit is one of its core components, which mainly functions to control the exhaust path of exhaled gas, regulate airway pressure, and maintain the normal operation of the breathing circuit in cooperation with other components.

[0003] Currently, most traditional anesthesia machines use pneumatic control to drive the opening and closing of the expiratory valve. This method relies on a compressed air source and a gas control pilot valve to achieve valve opening and closing actions. Although the structure is mature, there are still many shortcomings that make it difficult to meet the needs of modern high-performance anesthesia ventilation systems:

[0004] 1. Single function, dispersed structure: In traditional design, the expiratory valve and safety valve are two independent components, installed at different positions. This layout not only increases the device size, but also brings problems such as complex gas connection, pipe entanglement, and complicated assembly, limiting system integration and space utilization;

[0005] 2. Slow response speed: The expiratory valve in the existing anesthesia machine circuit is generally installed inside the circuit and connected to the circuit body by screws. The control is achieved by a gas control pilot valve that controls the opening and closing of the expiratory valve pneumatic control system. Due to the compressibility of gas and the lag problem of the pipeline, the expiratory valve response is slow, with significant response delay. Especially in high-frequency ventilation or fast pressure regulation application scenarios, it is difficult to meet the clinical demand for precise control of respiratory rhythm and tidal volume;

[0006] 3. Poor sealing performance: Since the expiratory valve, safety valve, waste gas pipeline, and driving gas pipeline are distributed in different positions, the sealing points are scattered, increasing the risk of gas leakage. Leakage not only can cause abnormal gas circuit pressure, but also can affect the stability and safety of anesthetic gas concentration control;

[0007] 4. Complicated maintenance and operation: The traditional expiratory valve is installed in the circuit by screws, making it difficult to disassemble and assemble. Especially during equipment maintenance or replacement, multiple modules need to be disassembled, resulting in long downtime, heavy workload, and affecting clinical efficiency;

[0008] 5. Lack of integration and modularity: The traditional expiratory valve assembly lacks standardized and modular design, which is not conducive to the scale-up of production and assembly and cost control, and also limits the maintainability and life cycle management capability of the equipment.

[0009] Therefore, there is an urgent need for a modular and high-integration electronic-driven exhalation valve assembly. SUMMARY

[0010] The present application aims to overcome the above-mentioned problems in the prior art, and provides an exhalation valve assembly for an anesthesia machine and an anesthesia machine.

[0011] To solve the above technical problems, the technical scheme of the present application provides an exhalation valve assembly for an anesthesia machine, comprising: an exhalation valve housing, a driving gas device, an exhalation valve, a waste gas connection pipe 12, a first driving gas connection pipe 9 and a second driving gas connection pipe 10; wherein,

[0012] The exhalation valve housing is provided with a driving gas pipeline 3 located inside the exhalation valve housing;

[0013] The exhalation valve housing is provided with a second driving gas interface 6, a third driving gas interface 15 and an exhalation valve mounting port 16 connected with the driving gas pipeline 3; wherein,

[0014] The second driving gas interface 6 is connected with the first end of the driving gas pipeline 3 for mounting the second driving gas connection pipe 10; the third driving gas interface 15 is connected with the second end of the driving gas pipeline 3 for connecting the driving gas device; the exhalation valve mounting port 16 is located on the flow path of the driving gas pipeline 3 for mounting the exhalation valve;

[0015] The exhalation valve housing is further provided with a waste gas pipeline interface 11 for mounting the waste gas connection pipe 12; the communication or disconnection between the driving gas pipeline 3 and the waste gas pipeline interface 11 is controlled by the exhalation valve;

[0016] The exhalation valve housing is further provided with a loop interface 17 for connecting with the machine control ventilation inlet of the manual machine control valve of the anesthesia machine loop, and the loop interface 17 is connected with the first driving gas connection pipe 9; the first driving gas connection pipe 9 is further connected with the second driving gas connection pipe 10 through a coil pipe.

[0017] As an improvement of the above-mentioned exhalation valve assembly, in the exhalation mode of the machine control state, the driving gas device is closed, the exhalation valve is opened, the driving gas pipeline 3 is communicated with the waste gas pipeline interface 11, and the gas flow path is: the gas discharged by the user enters the coil pipe from the machine control ventilation inlet of the manual machine control valve of the anesthesia machine loop through the first driving gas connection pipe 9, and then enters from the first end of the driving gas pipeline 3 through the second driving gas connection pipe 10, and is discharged into the waste gas connection pipe 12 after flowing through the exhalation valve; in the inhalation mode of the machine control state, the driving gas device is opened, the exhalation valve is closed, the driving gas pipeline 3 is disconnected with the waste gas pipeline interface 11, and the gas flow path is: the driving gas enters from the second end of the driving gas pipeline 3 through the third driving gas interface 15, and then flows to the anesthesia machine loop through the loop interface 17 in sequence through the second driving gas connection pipe 10, the coil pipe and the first driving gas connection pipe 9.

[0018] As an improvement of the above-mentioned exhalation valve assembly, the exhalation valve housing comprises a first shell 1, a second shell 2 and a sealing ring 4; the first shell 1 and the second shell 2 are fastened and spliced by a connecting piece, and the splicing part is provided with the sealing ring 4 to ensure the air tightness.

[0019] As an improvement of the above-mentioned exhalation valve assembly, it further comprises an APL valve, the exhalation valve housing is provided with an APL valve interface 18, the APL valve interface 18 is communicated with the driving gas pipeline 3, and the APL valve is installed; the APL valve interface 18 is also connected with the manual ventilation inlet of the manual machine control valve of the anesthesia machine circuit; in the manual state of the exhalation mode, when the pressure in the gas passage in the anesthesia machine circuit exceeds the set pressure threshold of the APL valve, the APL valve is opened, and the gas discharged by the user is discharged into the waste gas connecting pipe 12 through the APL valve, the driving gas pipeline 3 and the exhalation valve.

[0020] As an improvement of the above-mentioned exhalation valve assembly, the driving gas pipeline 3 is in an L-shaped structure, and a circular arc transition is adopted at the corner to reduce the gas flow resistance.

[0021] As an improvement of the above-mentioned exhalation valve assembly, the exhalation valve comprises an exhalation valve opening 7, a valve diaphragm 8 and a voice coil motor 24; wherein: the exhalation valve opening 7 and the valve diaphragm 8 are arranged in the exhalation valve mounting port 16; the driving gas pipeline 3 is communicated with the waste gas pipeline interface 11 through the exhalation valve mounting port 16; the exhalation valve realizes on-off control by adjusting the opening and closing degree between the exhalation valve opening 7 and the valve diaphragm 8; the voice coil motor 24 is connected with an external control board to receive a control electric signal, the motor shaft end is connected with the valve diaphragm 8, and based on the control electric signal, the current size is adjusted to control the output force of the motor shaft end, and then the stroke of the valve diaphragm 8 is adjusted.

[0022] As an improvement of the above-mentioned exhalation valve assembly, it further comprises a bracket, the bracket is used for fixedly installing the voice coil motor 24 outside the exhalation valve housing.

[0023] As an improvement of the above-mentioned exhalation valve assembly, it further comprises a safety valve assembly 14 installed between the driving gas pipeline 3 and the exhaust pipeline interface 11, the safety valve assembly 14 comprising a safety valve port 19, a safety valve diaphragm 20, a spring 21 and a gland 22; wherein the safety valve port 19 and the gland 22 are fixed in the driving gas pipeline 3; one end of the spring 21 abuts against the safety valve diaphragm 20 and the other end abuts against the gland 22; the spring 21 is in a pre-compressed state in a free state, keeping the safety valve diaphragm 20 sealed with the safety valve port 19; when the pressure in the driving gas pipeline 3 is less than a preset pressure threshold, the spring 21 applies a pre-tightening force to keep the safety valve diaphragm 20 sealed with the safety valve port 19; when the pressure in the driving gas pipeline 3 exceeds the preset pressure threshold, the safety valve diaphragm 20 overcomes the spring force of the spring 21 under the action of the gas pressure and leaves the safety valve port 19, so that the safety valve port 19 is communicated with the exhaust pipeline interface 11 to release pressure until the pressure in the driving gas pipeline 3 falls below the preset pressure threshold, and the spring 21 drives the safety valve diaphragm 20 to reseal.

[0024] As an improvement of the above-mentioned exhalation valve assembly, it further comprises a pressure monitoring device; the exhalation valve housing is further provided with a pressure sampling port 23 near the second driving gas interface 6 for installing the pressure monitoring device to monitor the internal pressure of the driving gas pipeline 3.

[0025] To achieve another object of the present application, the present application further provides an anesthesia machine comprising the above-mentioned exhalation valve assembly for an anesthesia machine.

[0026] Compared with the prior art, the exhalation valve assembly for an anesthesia machine and the anesthesia machine of the present application have the advantages of high structural integration, fast response, strong sealing and easy maintenance. First, the exhalation valve (including the exhalation valve opening 7 and the valve diaphragm 8) and the safety valve assembly 14 (including the safety valve port 19, the safety valve diaphragm 20, the spring 21 and the gland 22) are integrated in the same module, which simplifies the dispersed structure layout in the traditional system, reduces the connecting pipeline and the sealing point, and significantly reduces the risk of leakage. Moreover, the voice coil motor 24 is used to drive the valve diaphragm 8 to adjust the opening degree of the exhalation valve, and the response time is less than 10 ms, which is more than 300% higher than the response speed of the traditional pneumatic control structure, meeting the demand of high-frequency ventilation and fine pressure regulation. The driving gas pipeline 3 is communicated with the gas source and the control device through the second driving gas interface 6 and the third driving gas interface 15, and the internal gas passage is reasonably arranged with arc transition and small flow resistance. Various functional interfaces such as the circuit interface 17, the APL valve interface 18 and the pressure sampling port 23 are integrated in the first housing 1 and the second housing 2, which are matched with the sealing ring 4 and the quick-release screw structure to realize modular assembly and facilitate quick disassembly and maintenance. The exhalation valve assembly has compact structure, unified interface and perfect function, can effectively reduce the manufacturing cost, improve the equipment reliability and service life, and is widely applicable to modern anesthesia machines and upgrading systems thereof. Attached Figure Description

[0027] Figure 1 An exploded view of the expiratory valve assembly for an anesthesia machine provided in Embodiment 1 of the present invention;

[0028] Figure 2 A first gas flow diagram for the expiratory valve assembly of an anesthesia machine provided in Example 1;

[0029] Figure 3 A second gas flow diagram for the expiratory valve assembly of an anesthesia machine provided in Example 1;

[0030] Figure 4 This is a schematic diagram of the exhalation valve installation.

[0031] Figure 5 A schematic diagram of the installation of safety valve assembly 14. Detailed Implementation

[0032] The technical solutions provided by the present invention will be further illustrated below with reference to the embodiments.

[0033] Example 1

[0034] The overall structure of the expiratory valve assembly for an anesthesia machine provided in this embodiment is as follows: Figure 1 As shown.

[0035] The exhalation valve assembly adopts a modular structure and a housing splicing design. Specifically, the first housing 1 and the second housing 2 are spliced ​​together by screws to form a complete exhalation valve shell. A sealing ring 4 is installed at the splice to ensure airtightness and prevent leakage of driving gas or anesthetic gas. All functional components use this shell as a load-bearing foundation, resulting in a compact structure that facilitates modular assembly. This shell design improves overall rigidity and sealing performance, which is beneficial for reliable operation under high-pressure working conditions. At the same time, modular manufacturing enhances maintenance convenience and production consistency.

[0036] Gas passage structure and interface layout as follows Figures 1 to 3 As shown.

[0037] The exhalation valve housing contains a driving air line 3. The exhalation valve housing also includes a second driving air interface 6, a third driving air interface 15, and an exhalation valve mounting port 16, all connected to the driving air line 3. The second driving air interface 6 connects to the first end of the driving air line 3 for installing a second driving air connector 10. The third driving air interface 15 connects to the second end of the driving air line 3 for connecting a driving air device. The exhalation valve mounting port 16 is located in the flow path of the driving air line 3 and is used to install the exhalation valve. The exhalation valve housing also includes an exhaust gas pipe interface 11 for installing an exhaust gas connector 12. The exhalation valve controls the connection and disconnection between the driving air line 3 and the exhaust gas pipe interface 11.

[0038] The expiratory valve housing is provided with a circuit interface 17, specifically in the second housing 2, which is connected with the machine-controlled ventilation inlet of the manual machine-controlled valve of the anesthesia machine circuit, and is also connected with the first driving gas connection pipe 9.

[0039] The first driving gas connection pipe 9 and the second driving gas connection pipe 10 are connected through a coil pipe to form a gas re-breathing flow channel. The coil pipe is an internally curved spiral pipe (not shown in the figure).

[0040] The waste gas connection pipe 12 is also connected with the anesthetic gas removal system, which is responsible for guiding the waste gas out to the external environment. The connection is sealed by a waste gas interface sealing ring 13 to ensure the sealing of the gas guiding process.

[0041] The housing is also provided with an APL valve interface 18 connected with the driving gas pipeline 3 for installing an APL valve, which is connected with the manual ventilation inlet of the manual machine-controlled valve of the anesthesia machine circuit.

[0042] The housing is also provided with a pressure sampling port 23 near the second driving gas interface 6 for installing a pressure monitoring device to monitor the internal pressure of the driving gas pipeline 3.

[0043] The driving gas pipeline 3 can be an L-shaped pipeline with a circular arc transition at the corner to reduce the gas flow resistance.

[0044] The expiratory valve assembly integrates multiple groups of gas interfaces in a unified module structure, with compact interface distribution and clear logic, greatly reducing the total length of the gas circuit and the number of connection points, and reducing the risk of leakage from the source.

[0045] In the machine-controlled state, the APL valve is closed, and the flow paths of the expiratory mode and the inspiratory mode in the machine-controlled state are as shown in Figure 2 and Figure 3 .

[0046] In the machine-controlled expiratory mode, the driving gas device is closed, the expiratory valve is opened, the driving gas pipeline 3 is connected with the waste gas pipeline interface 11, and the expiratory path is shown by the green arrow. Specifically, the user's exhaled gas enters the first driving gas connection pipe 9 from the machine-controlled ventilation inlet of the manual machine-controlled valve of the anesthesia machine circuit, flows through the coil pipe into the second driving gas connection pipe 10, then enters the driving gas pipeline 3 from the first end of the driving gas pipeline 3, flows through the expiratory valve and is discharged into the waste gas connection pipe 12, and then is collected by the anesthetic gas removal system.

[0047] In the machine-controlled state inhalation mode, the driving gas device is opened, the exhalation valve is closed, the driving gas pipeline 3 is disconnected from the waste gas pipeline interface 11, and the inhalation path is shown by the red arrow. Specifically, the driving gas enters the driving gas pipeline 3 from the second end of the driving gas pipeline 3 through the third driving gas interface 15, enters the second driving gas interface pipe 10 from the first end of the driving gas pipeline 3, enters the coil, mixes with the gas in the coil, enters the first driving gas interface pipe 9, and then flows to the anesthesia machine circuit through the circuit interface 17.

[0048] In the manual state exhalation mode, the APL valve starts to work. When the pressure in the gas channel in the anesthesia machine circuit exceeds the set pressure threshold of the APL valve, the APL valve is opened, the user's exhaled gas enters from the manual ventilation inlet of the manual machine-controlled valve of the anesthesia machine circuit, enters the driving gas pipeline 3 through the APL valve, flows through the exhalation valve, and is discharged into the waste gas interface pipe 12, and then is collected by the anesthetic gas removal system.

[0049] The gas paths in the three modes are optimized, the channel is simple, and the conversion is rapid. The inhalation and exhalation paths are highly integrated in the integrated driving gas pipeline.

[0050] As shown in Figure 4 , the exhalation valve includes an exhalation valve opening 7 and a valve diaphragm 8. The exhalation valve opening 7 and the valve diaphragm 8 are located in the exhalation valve mounting port 16, and the driving gas pipeline 3 is connected with the waste gas pipeline interface 11 through the exhalation valve mounting port 16. The exhalation valve adjusts the on-off state of the exhalation valve opening 7 by adjusting the opening degree between the exhalation valve opening 7 and the valve diaphragm 8, that is, the flow area between the driving gas pipeline 3 and the waste gas pipeline interface 11. The valve diaphragm 8 controls the stroke of the valve diaphragm 8 through the voice coil motor 24. Specifically, the motor shaft end of the voice coil motor 24 is connected with the valve diaphragm 8, and the size of the output force of the motor shaft end of the voice coil motor 24 is controlled through the electric signal, so as to control the stroke of the valve diaphragm 8. The voice coil motor 24 can be installed on the exhalation valve shell through the support, connected with the control board through the cable, and according to the preset current size, the stroke of the valve diaphragm 8 is controlled in the exhalation mode and the inhalation mode.

[0051] The response time of the voice coil motor 24 is less than or equal to 10 ms, the valve diaphragm 8 is quickly opened and closed, the exhalation valve opening 7 is quickly adjusted, the exhalation valve opening degree is accurately and quickly adjusted, and different user ventilation requirements are adapted. The voice coil motor 24 is used to replace the gas control structure, the compression gas lag problem is avoided, the response speed is improved by more than 300%, is suitable for high-frequency ventilation and other high-response demand scenes, and the ventilation control precision is improved.

[0052] As shown in Figure 5As shown, the safety valve assembly 14 is installed between the driving gas pipeline 3 and the exhaust gas interface 11, which includes a safety valve port 19, a safety valve diaphragm 20, a spring 21 and a gland 22. The safety valve port 19 and the gland 22 are fixedly connected in the driving gas pipeline 3, one end of the spring 21 abuts against the safety valve diaphragm 20, and the other end abuts against the gland 22; the spring 21 is in a pre-compressed state in a free state, keeping the safety valve diaphragm 20 sealed with the safety valve port 19. When the pressure in the driving gas pipeline 3 is less than a preset pressure threshold, the spring 21 applies a pre-tightening force to keep the safety valve diaphragm 20 sealed with the safety valve port 19, and the communication between the safety valve port 19 and the exhaust gas pipeline interface 11 is disconnected. When the pressure in the driving gas pipeline 3 is greater than the preset pressure threshold, the gas pressure pushes the safety valve diaphragm 20 to overcome the elastic force of the spring 21, so that the safety valve diaphragm 20 is separated from the safety valve port 19, the safety valve port 19 is communicated with the exhaust gas pipeline interface 11 to release pressure, and the spring 21 drives the safety valve diaphragm 20 to reseal until the pressure in the driving gas pipeline 3 falls below the preset pressure threshold. The overpressure gas is discharged from the exhaust gas pipeline interface 11 for automatic pressure relief, preventing the risk of airway overpressure.

[0053] The components of the exhalation valve assembly are independently produced and assembled through standardized interfaces, reducing production costs and realizing structural modularization. Quick disassembly and maintenance are supported, prolonging the service life of the equipment.

[0054] Embodiment 2

[0055] The anesthesia machine provided in the embodiment includes the exhalation valve assembly for the anesthesia machine provided in the embodiment 1, and the exhalation valve assembly includes an exhalation valve housing, a driving gas device, an exhalation valve, an exhaust gas connecting pipe 12, a first driving gas connecting pipe 9 and a second driving gas connecting pipe 10; wherein

[0056] The exhalation valve housing is provided with a driving gas pipeline 3 located inside the exhalation valve housing;

[0057] The exhalation valve housing is provided with a second driving gas interface 6, a third driving gas interface 15 and an exhalation valve mounting port 16 connected with the driving gas pipeline 3; wherein

[0058] The second driving gas interface 6 is connected with the first end of the driving gas pipeline 3 and used for mounting the second driving gas connecting pipe 10; the third driving gas interface 15 is connected with the second end of the driving gas pipeline 3 and used for connecting the driving gas device; and the exhalation valve mounting port 16 is located on the flow path of the driving gas pipeline 3 and used for mounting the exhalation valve;

[0059] The exhalation valve housing is further provided with an exhaust gas pipeline interface 11 used for mounting the exhaust gas connecting pipe 12; the communication or disconnection between the driving gas pipeline 3 and the exhaust gas pipeline interface 11 is controlled by the exhalation valve;

[0060] The expiratory valve shell is further provided with a circuit interface 17 for connecting with the machine-controlled ventilation inlet of the manual machine-controlled valve of the anesthesia machine circuit, and the circuit interface 17 is connected with the first driving gas connecting pipe 9; the first driving gas connecting pipe 9 is further connected with the second driving gas connecting pipe 10 through the coil pipe.

[0061] The anesthesia machine provided by the embodiment improves the ventilation control performance and system reliability of the whole machine by integrating the reasonably designed expiratory valve assembly. The driving gas pipeline 3 is arranged inside the expiratory valve shell of the expiratory valve assembly, realizing the embedded arrangement of the driving gas passage, effectively reducing the external pipeline connection, and improving the system compactness and air tightness; the expiratory valve shell is provided with the second driving gas interface 6, the third driving gas interface 15 and the expiratory valve mounting port 16, which are respectively connected with the second driving gas connecting pipe 10, the driving gas device and the expiratory valve, forming the control path of the driving gas, which is conducive to improving the precise adjustment ability of the expiratory process; the waste gas pipeline interface 11 is connected with the waste gas connecting pipe 12, which cooperates with the on-off control of the driving gas pipeline 3 and the waste gas passage by the expiratory valve, to ensure that the waste gas is discharged in time and cross contamination is avoided; the circuit interface 17 is connected with the machine-controlled ventilation inlet of the manual machine-controlled valve of the anesthesia machine circuit, and the first driving gas connecting pipe 9 and the coil pipe are connected with the second driving gas connecting pipe 10, which effectively buffers the airflow fluctuation by the coil pipe, improving the system operation stability. The overall structure of the expiratory valve assembly is compact and has high functional integration, which significantly improves the ventilation control efficiency, operation reliability and maintenance convenience of the anesthesia machine, and is suitable for clinical anesthesia application scenarios with high control precision and safety requirements. Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application but not limit. Although the technical solutions of the present application are described in detail with reference to the embodiments, those skilled in the art should understand that the modification or equivalent replacement of the technical solutions of the present application does not deviate from the spirit and scope of the technical solutions of the present application, and should be covered in the scope of the claims of the present application.

Claims

1. An expiratory valve assembly for an anesthesia machine, comprising: The exhalation valve housing, the driving gas device, the exhalation valve, the waste gas connection pipe (12), the first driving gas connection pipe (9), and the second driving gas connection pipe (10); wherein, The exhalation valve housing is provided with a drive air line (3), which is located inside the exhalation valve housing; The exhalation valve housing is provided with a second driving air interface (6), a third driving air interface (15), and an exhalation valve mounting port (16) connected to the driving air pipeline (3); wherein, The second driving gas interface (6) is connected to the first end of the driving gas pipeline (3) and is used to install the second driving gas connector (10); the third driving gas interface (15) is connected to the second end of the driving gas pipeline (3) and is used to connect the driving gas device; the exhalation valve installation port (16) is located on the flow path of the driving gas pipeline (3) and is used to install the exhalation valve. The exhalation valve housing is also provided with an exhaust pipe interface (11) for installing an exhaust pipe connector (12); the connection or disconnection between the drive air pipe (3) and the exhaust pipe interface (11) is controlled by the exhalation valve. The exhalation valve housing is also provided with a circuit interface (17) for connecting to the machine-controlled ventilation inlet of the manual control valve of the anesthesia machine circuit, and the circuit interface (17) is connected to the first driving gas pipe (9); the first driving gas pipe (9) is also connected to the second driving gas pipe (10) through a coil.

2. The expiratory valve assembly for an anesthesia machine according to claim 1, characterized in that, In the exhalation mode under machine control, the driving gas device is closed, the exhalation valve is opened, the driving gas pipeline (3) is connected to the waste gas pipeline interface (11), and the gas flow path is as follows: the gas discharged by the user enters the coil through the machine control ventilation inlet of the manual control valve of the anesthesia machine circuit via the first driving gas connector (9), and then enters from the first end of the driving gas pipeline (3) through the second driving gas connector (10), flows through the exhalation valve and is discharged into the waste gas connector (12); In the inhalation mode under machine control, the driving gas device is turned on, the exhalation valve is closed, the driving gas pipeline (3) is disconnected from the exhaust gas pipeline interface (11), and the gas flow path is as follows: the driving gas enters from the second end of the driving gas pipeline (3) through the third driving gas interface (15), passes through the second driving gas connector (10), the coil, and the first driving gas connector (9) in sequence, and then flows to the anesthesia machine circuit through the circuit interface (17).

3. The expiratory valve assembly for an anesthesia machine according to claim 1, characterized in that, The exhalation valve housing includes a first housing (1), a second housing (2), and a sealing ring (4); the first housing (1) and the second housing (2) are fastened together by a connector, and a sealing ring (4) is provided at the joint to ensure airtightness.

4. The expiratory valve assembly for an anesthesia machine according to claim 1, characterized in that, It also includes an APL valve, the exhalation valve housing is provided with an APL valve interface (18), the APL valve interface (18) is connected to the drive air line (3) for installing the APL valve; the APL valve interface (18) is also connected to the manual ventilation inlet of the manual control valve of the anesthesia machine circuit; In manual expiratory mode, when the pressure in the gas channel of the anesthesia machine circuit exceeds the pressure threshold set by the APL valve, the APL valve opens, and the gas expelled by the user is discharged into the waste gas pipe (12) through the APL valve, the drive gas line (3), and the expiratory valve.

5. The expiratory valve assembly for an anesthesia machine according to claim 1, characterized in that, The driving gas pipeline (3) has an L-shaped structure with rounded transitions at the corners to reduce gas flow resistance.

6. The expiratory valve assembly for an anesthesia machine according to claim 1, characterized in that, The exhalation valve includes an exhalation valve opening (7), a valve diaphragm (8), and a voice coil motor (24); wherein: The exhalation valve opening (7) and the valve plate (8) are located inside the exhalation valve mounting port (16); The drive air line (3) is connected to the exhaust gas line interface (11) through the exhalation valve mounting port (16); The exhalation valve achieves on / off control by adjusting the degree of opening and closing between the exhalation valve opening (7) and the valve plate (8); The voice coil motor (24) is connected to an external control board and receives control electrical signals. Its motor shaft is connected to the valve diaphragm (8) and adjusts the current based on the control electrical signals to control the output force of the motor shaft, thereby adjusting the stroke of the valve diaphragm (8).

7. The expiratory valve assembly for an anesthesia machine according to claim 6, characterized in that, It also includes a bracket for securing the voice coil motor (24) to the outside of the exhalation valve housing.

8. The expiratory valve assembly for an anesthesia machine according to claim 1, characterized in that, It also includes a safety valve assembly (14), which is installed between the drive gas line (3) and the exhaust gas line interface (11). The safety valve assembly (14) includes: a safety valve port (19), a safety valve diaphragm (20), a spring (21), and a gland (22); wherein, The safety valve port (19) and the pressure cap (22) are fixed inside the drive air line (3); One end of the spring (21) abuts against the safety valve diaphragm (20), and the other end abuts against the pressure plate (22); The spring (21) is in a pre-compressed state in the free state, keeping the safety valve diaphragm (20) sealed to the safety valve port (19); When the pressure in the drive air line (3) is less than the preset pressure threshold, the spring (21) applies a preload force to keep the safety valve diaphragm (20) sealed at the valve port (19); When the pressure in the driving air pipeline (3) exceeds the preset pressure threshold, the safety valve diaphragm (20) overcomes the spring force of the spring (21) under the action of gas pressure and leaves the safety valve port (19), so that the safety valve port (19) and the exhaust gas pipeline interface (11) are connected to release pressure until the pressure in the driving air pipeline (3) drops back to below the preset pressure threshold, and the spring (21) drives the safety valve diaphragm (20) to reseal.

9. The expiratory valve assembly for an anesthesia machine according to claim 1, characterized in that, It also includes a pressure monitoring device; the exhalation valve housing is also provided with a pressure sampling port (23), located near the second driving gas interface (6), for installing a pressure monitoring device to monitor the internal pressure of the driving gas pipeline (3).

10. An anesthesia machine, characterized in that, Includes the expiratory valve assembly for an anesthesia machine according to any one of claims 1-9.

Images