Manual control switching valve device and anaesthesia machine

Abstract

The invention relates to the technical field of medical instruments, in particular to a hand-operated machine-controlled switching valve device and an anaesthesia machine, and the hand-operated machine-controlled switching valve device comprises a valve seat (1) which is provided with a soda lime tank connector (16), an air outlet connector (2), a machine-controlled ventilation inlet (11), a hand-operated ventilation inlet (12) and a valve port (14); the valve rod (4) is arranged in the valve seat (1); the sealing gasket (10) is installed on the valve rod (4) and used for being in sealing fit with the first valve port side or the second valve port side of the valve port (14) when the valve rod (4) moves to the first position or the second position; and a driving source; under the action of a driving source, the valve rod (4) moves to a first position, so that the sealing gasket (10) closes the manual ventilation inlet (12) and opens the mechanical control ventilation inlet (11); and under the action of a driving source, the valve rod (4) returns to the second position from the first position, so that the sealing gasket (10) closes the mechanical control ventilation inlet (11) and opens the manual ventilation inlet (12), and automatic switching of ventilation channels is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a manual-machine control switching valve device and an anesthesia machine. BACKGROUND

[0002] Anesthesia machines are important devices commonly used in modern medical processes, and their core function is to provide continuous, stable, and safe gas supply for users during surgery and other processes. The circuit system of an anesthesia machine usually includes two ventilation channels: a machine control ventilation channel and a manual ventilation channel. The machine control ventilation channel provides precise ventilation parameters through program control when the device is working normally; while in the event of power failure, gas source interruption, or control system failure, the manual ventilation channel provides backup ventilation protection.

[0003] In traditional anesthesia machines, a manual-machine control switching valve is provided between the two channels. The existing switching valve design mostly adopts an eccentric handle structure, that is, an eccentric handle structure with a core shaft and a spring is arranged in the circuit, the core shaft is driven by manually rotating the handle to lift or lower the valve with a sealing diaphragm, thereby opening or closing the valve to realize the switching of manual ventilation and machine control ventilation. This type of structure has the following obvious defects:

[0004] 1. Complex structure and large volume: the arrangement of components such as eccentric wheel, core shaft, and spring is complex, resulting in a large valve volume and high requirements for internal space layout of the device;

[0005] 2. Operation depends on human intervention: the switching process needs to be completed by the operator in time, and if there is an emergency or the operator reacts slowly, it may cause delay in ventilation switching, affecting the safety of the user;

[0006] 3. High maintenance cost: there are many mechanical parts, frequent movement, and easy wear or deviation, which requires regular maintenance and replacement.

[0007] Therefore, there is an urgent need for a manual and machine control ventilation switching device with compact structure, strong automatic switching capability, fast response, stable and reliable operation, to improve the safety and practicality of anesthesia machines. SUMMARY

[0008] The purpose of the present application is to overcome the above-mentioned defects of the prior art, and to provide a manual-machine control switching valve device and an anesthesia machine.

[0009] To solve the above technical problems, the technical solution of the present application provides a manual-machine control switching valve device for switching the gas circuit between the machine control ventilation channel and the manual ventilation channel of an anesthesia machine, comprising:

[0010] Valve seat 1, with a hollow cavity structure, is provided with a sodium lime tank interface 16, an air outlet interface 2, a machine-controlled ventilation inlet 11 and a manual ventilation inlet 12, wherein the machine-controlled ventilation inlet 11 and the manual ventilation inlet 12 are respectively used for connecting the machine-controlled channel and the manual channel of the anesthesia machine; the valve seat 1 is also provided with a valve port 14 at the corresponding position of the air outlet interface 2 and the manual ventilation inlet 12;

[0011] Valve stem 4, arranged in the hollow cavity of the valve seat 1, can reciprocate along the axis relative to the valve seat 1;

[0012] Sealing pad 10, mounted to the valve stem 4, is located at the corresponding position of the valve port 14, and is used for sealing cooperation with the valve port first side or the valve port second side of the valve port 14 respectively when the valve stem 4 moves to the first position or the second position, so as to realize the switching of the ventilation channel; and,

[0013] Driving source, used for driving the valve stem 4 to move between the first position and the second position;

[0014] Wherein, under the action of the driving source, the valve stem 4 moves to the first position, so that the sealing pad 10 closes the manual ventilation inlet 12 and opens the machine-controlled ventilation inlet 11; under the action of the driving source, the valve stem 4 returns to the second position from the first position, so that the sealing pad 10 closes the machine-controlled ventilation inlet 11 and opens the manual ventilation inlet 12, realizing the automatic switching of the ventilation channel.

[0015] As an improvement of the above-mentioned device, the driving source includes an electric actuator.

[0016] As an improvement of the above-mentioned device, it further includes an end cover 7, the driving source includes a driving gas and a reset spring 6, wherein the end cover 7 is connected with the valve seat 1, the driving gas inlet 3 of the driving gas is located at the end cover 7, the valve seat 1 is provided with a guide hole 13 at the corresponding position of the driving gas inlet 3, the valve stem 4 is provided with a force receiving part 17 at one end close to the driving gas inlet 3, the force receiving part 17 is located in the guide hole 13 and sealingly cooperates with the side wall of the guide hole 13, used for receiving the driving force of the driving gas to push the valve stem 4 to move, the valve seat 1 is provided with a first limiting part 15, the reset spring 6 is arranged around the valve stem 4 and located between the first limiting part 15 and the force receiving part 17; under the action of the driving gas, the force receiving part 17 pushes the valve stem 4 to the first position, so that the sealing pad 10 closes the manual ventilation inlet 12 and opens the machine-controlled ventilation inlet 11; when the driving gas is closed, the reset spring 6 pushes the valve stem 4 to return to the second position, so that the sealing pad 10 closes the machine-controlled ventilation inlet 11 and opens the manual ventilation inlet 12, realizing the automatic switching of the ventilation channel.

[0017] As an improvement of the above-mentioned device, it further comprises a second limiting part 18 and an open blocking ring 9; the second limiting part 18 is arranged in the valve seat 1 and cooperates with the first end of the valve rod 4 to form a first mechanical limiting part for limiting the first position; the open blocking ring 9 is arranged on the valve rod 4 and cooperates with the first limiting part 15 to form a second mechanical limiting part for limiting the second position.

[0018] As an improvement of the above-mentioned device, it further comprises a first sealing part arranged outside the stress part 17 for sealing with the inner wall of the guide hole 13 and a second sealing part arranged between the valve seat 1 and the end cover 7.

[0019] As an improvement of the above-mentioned device, the manual ventilation inlet 12 is arranged along the axis of the valve rod 4, the axes of the air outlet 2 and the machine-controlled ventilation inlet 11 are perpendicular to the axis of the valve rod 4; the air outlet 2 is arranged close to the manual ventilation inlet 12, the machine-controlled ventilation inlet 11 is arranged away from the air outlet 2; the valve port 14 is arranged at the intersection of the axes of the air outlet 2 and the manual ventilation inlet 12 and has opposite first and second valve port sides.

[0020] As an improvement of the above-mentioned device, the guide hole 13 is arranged at the end of the valve seat 1 away from the manual ventilation inlet 12 and is sealingly connected with the end cover 7.

[0021] As an improvement of the above-mentioned device, the reset spring 6 is a compression spring, one end of which abuts against the first limiting part 15 and the other end of which abuts against the stress part 17, for pushing the valve rod 4 back when the driving gas fails.

[0022] As an improvement of the above-mentioned device, the valve seat 1 is an integrally formed structure or is formed by splicing several valve seat components, wherein the splicing part is sealed by a sealing part.

[0023] In order to achieve another object of the present application, the present application further provides a anesthesia machine comprising the above-mentioned manual and machine-controlled switching valve device.

[0024] Compared with the prior art, the manual-machine control switching valve device and the anesthesia machine of the present application have the advantages of compact structure, reasonable layout, excellent automatic switching function and sealing performance. By providing the gas outlet 2, the machine-controlled ventilation inlet 11 and the manual ventilation inlet 12 in the valve seat 1, reliable connection with the ventilation system of the anesthesia machine is realized; by forming the driving cavity through the guide hole 13 and the end cover 7, the high-pressure driving gas acts on the stress part 17 on the valve rod 4 through the driving gas inlet 3, so that the valve rod 4 drives the sealing gasket 10 to switch between the first side and the second side of the valve port 14, and the opening and closing of the manual and machine-controlled ventilation channels are realized respectively. The device is also provided with the first limiting part 15, the second limiting part 18 and the opening blocking ring 9, which accurately limits the reciprocating stroke of the valve rod 4, prevents the sealing gasket 10 from being compressed too much, and improves the sealing reliability and service life. The reset spring 6 can automatically push the valve rod 4 back to the original position when the driving gas is turned off, realizing automatic switching of the ventilation channel and ensuring ventilation safety in the case of power failure or system abnormality. The overall structure is modularized and the manufacturing cost is low, which is suitable for integration into the anesthesia machine system, improving the stability, automation degree and clinical application reliability of the equipment. Moreover, the valve seat 1 can be formed by splicing multiple components, which is convenient for modular assembly and maintenance. The splicing part is sealed by a sealing element to ensure air tightness and improve structural flexibility and processing efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 A cross-sectional view of the manual-machine control switching valve device provided for Embodiment 1 of the present application in a machine control state;

[0026] Figure 2 A cross-sectional view of the manual-machine control switching valve device provided for Embodiment 1 of the present application in a manual state;

[0027] Figure 3 A cross-sectional view of the valve seat assembly provided with the machine-controlled ventilation inlet 11;

[0028] Figure 4 A Figure 3 A perspective view of the valve seat assembly.

[0029] BRIEF DESCRIPTION OF DRAWINGS

[0030] 1, valve seat 2, gas outlet 3, driving gas inlet

[0031] 4, valve rod 5, O-shaped sealing ring 6, reset spring

[0032] 7, end cover 8, Y-shaped sealing ring 9, opening blocking ring

[0033] 10, sealing gasket 11, machine-controlled ventilation inlet 12, manual ventilation inlet

[0034] 13, guide hole 14, valve port 15, first limiting part

[0035] 16, sodium lime tank interface 17, force receiving portion 17 18, second limit portion DETAILED DESCRIPTION

[0036] The technical solutions provided by the present application are further illustrated below in combination with embodiments.

[0037] Embodiment 1

[0038] The present embodiment provides a kind of manual machine control switch valve device, as shown in Figure 1 And Figure 2 The valve seat 1 of the device is the main support structure, and the inside is hollow cavity structure, its first end is provided with manual ventilation inlet 12, second end is equipped with guide hole 13.Manual ventilation inlet 12 is coaxial with guide hole 13.

[0039] Valve seat 1 is set out gas interface 2 in the position close to manual ventilation inlet 12;Valve seat 1 is set machine control ventilation inlet 11 in the position close to guide hole 13, the axis of out gas interface 2 and machine control ventilation inlet 11 all is perpendicular to the axis of guide hole.Machine control ventilation inlet 11 is used to connect to the machine control channel of anesthetic machine, manual ventilation inlet 12 is used to connect to the manual channel of anesthetic machine.Valve seat 1 guide hole 13 is connected with end cap 7 by thread or buckle, end cap 7 sets drive gas inlet 3, for injecting high pressure drive gas into the guide hole 13 of valve seat 1.Valve seat 1 is set valve port 14 in the position where the axis of out gas interface 2 and manual ventilation inlet 12 meets.Valve port 14 has valve port first side close to manual ventilation inlet 12 and valve port second side away from manual ventilation inlet 12.

[0040] Valve stem 4 is hollow or solid metal structure, can move axially in the inside of valve seat 1.In the position close to the first end of valve stem 4, sealing pad 10 is equipped, and valve stem 4 moves to make sealing pad 10 move, so that sealing pad 10 forms sealing cooperation with valve port first side or valve port second side of valve port 14.

[0041] When valve stem 4 is in the first position shown in Figure 1 , sealing pad 10 forms sealing cooperation with valve port first side of valve port 14, and the gas flow of manual ventilation inlet 12 is blocked by sealing pad 10, so that out gas interface 2, machine control ventilation inlet 11 and sodium lime tank interface 16 are communicated through the hollow cavity of valve seat 1.Sodium lime tank is used to absorb carbon dioxide, and is connected with exhaust pipeline (not shown in the figure), which can be used as the inhalation pipeline of user.

[0042] When valve stem 4 is in the second position shown in Figure 2 , sealing pad 10 forms sealing cooperation with valve port second side of valve port 14, and the gas flow of machine control ventilation inlet 11 is blocked by sealing pad 10, so that out gas interface 2, manual ventilation inlet 12 and sodium lime tank interface 16 are communicated through the hollow cavity of valve seat 1.

[0043] The valve seat 1 is provided with a first limiting portion 15 below the machine-controlled ventilation inlet 11; the valve stem 4 is further provided with an open blocking ring 9 between the sealing gasket 10 and the first limiting portion 15, and the diameter of the open blocking ring 9 is larger than that of the valve stem 4. The valve seat 1 is further provided with a second limiting portion 18. The first limiting portion 15 of the first limiting portion 15 is matched with the open blocking ring 9, and the second limiting portion 18 is matched with the first end of the valve stem 4, thereby limiting the movement distance of the valve stem 4, forming mechanical limiting, and enabling the valve stem 4 to move between the first position and the second position, so that when the sealing gasket 10 is matched with the valve port first side or the valve port second side of the valve port 14, the sealing gasket 10 is prevented from being deformed excessively, thereby improving the sealing reliability and service life.

[0044] The second end of the valve stem 4 is provided with a force receiving portion 17; the side wall of the force receiving portion 17 has a shape matched with the inner wall of the guide hole 13 of the valve seat 1. The force receiving portion 17 of the valve stem 4 and the guide hole 13 of the valve seat 1 form a driving cavity.

[0045] The reset spring 6 is wound around the valve stem 4 and located between the first limiting portion 15 of the valve seat 1 and the force receiving portion 17 of the valve stem 4.

[0046] In terms of sealing structure, the side wall of the force receiving portion 17 of the valve stem 4 is provided with a Y-shaped sealing ring 8, which is tightly matched with the inner wall of the guide hole 13 to achieve air-tight sealing inside the driving cavity. In other embodiments, the Y-shaped sealing ring 8 can also be replaced by an O-shaped sealing ring or a generic sealing ring. The valve seat 1 is provided with an O-shaped sealing ring 5 at the joint with the end cover 7 to prevent the driving gas from leaking out, thereby ensuring the sealing performance and reliability of the valve body cavity.

[0047] The valve seat 1 can be an integrated structure, as shown in Figure 1 and Figure 2 The valve seat 1 can also be formed by splicing a plurality of independent valve seat assemblies, and the joints between the valve seat assemblies are sealed by sealing members. Figure 3 and Figure 4 One of the independent valve seat assemblies of the valve seat 1 formed by splicing a plurality of valve seat assemblies is shown, which is provided with a machine-controlled ventilation inlet 11 and can be spliced with other parts of the valve seat 1.

[0048] The working states of the manual machine-controlled switching valve device are described as follows

[0049] 1. Machine-controlled ventilation state

[0050] As shown in Figure 1 , in the normal working state, high-pressure driving gas (typical working pressure is 200 kPa) is input to the driving gas inlet 3, the driving gas enters the driving cavity and acts on the force receiving portion 17 of the second end of the valve stem 4, pushing the valve stem 4 to move away from the driving gas inlet 3, Figure 1 which is shown as moving to the left.

[0051] At this time, the valve stem 4 drives the sealing gasket 10 to move toward the manual ventilation inlet 12 ( Figure 1 (moves to the left in the middle) until the valve stem 4 moves to the first position, so that the sealing gasket 10 and the valve port 14 of the valve seat 1 are in contact with each other on the first side of the valve port ( Figure 1 The left side in the middle) is sealed and fitted, thereby closing the manual ventilation inlet 12; at the same time, the machine-controlled ventilation inlet 11 connected to the machine-controlled channel of the anesthesia machine is in an open state, and the air outlet interface 2, the machine-controlled ventilation inlet 11 and the soda lime tank interface 16 are connected through the hollow cavity of the valve seat 1 to realize machine-controlled ventilation.

[0052] During the left movement of the valve stem 4, the first end portion (left end portion) of the valve stem 4 contacts the second limit portion 18 of the valve seat 1, forming a left-direction mechanical limit, ensuring the accuracy of the movement stroke and avoiding leakage caused by displacement or insufficient compression of the sealing gasket 10.

[0053] 2. Manual ventilation status

[0054] like Figure 2 As shown, when the device is powered off, the gas source is interrupted, or the control system is abnormal, causing the driving gas to stop inputting, the driving cavity loses pressure, and the return spring 6 begins to release its elastic force, pushing the valve stem 4 to move toward the driving gas inlet 3 ( Figure 2 shown as moving right).

[0055] The valve stem 4 drives the sealing gasket 10 to move toward the direction close to the machine-controlled ventilation inlet 11 ( Figure 1 until the valve stem 4 moves to the second position, so that the sealing gasket 10 and the valve port 14 of the valve seat 1 are in contact with each other on the second side of the valve port ( Figure 2 The valve seat 1 is sealed and fitted, thereby closing the machine-controlled ventilation inlet 11; at the same time, the manual ventilation inlet 12 connected to the manual channel of the anesthesia machine is in the open state, and the air outlet interface 2, the manual ventilation inlet 12 and the soda lime tank interface 16 are connected through the hollow cavity of the valve seat 1 to realize manual ventilation.

[0056] During this process, the opening retaining ring 9 of the valve stem 4 contacts the first limiting portion 15 of the valve seat 1 to form a rightward mechanical limit, ensuring accurate movement stroke and avoiding leakage caused by displacement or insufficient compression of the sealing gasket 10.

[0057] In other embodiments, an electric actuator may be used instead of the high-pressure driving gas to drive the valve stem 4 to move left and right.

[0058] The device can be easily integrated into the breathing circuit system of anesthesia machines. Due to its compact structure, reliable sealing, automatic switching, and rapid response, it is particularly suitable for clinical medical applications with high requirements for safety and ventilation continuity.

[0059] Example 2

[0060] The embodiment provides an anesthesia machine, which comprises the manual-machine-controlled switching valve device provided in the embodiment 1, the manual-machine-controlled switching valve device is used for switching the gas path between a machine-controlled ventilation channel and a manual ventilation channel of the anesthesia machine, and comprises the following:

[0061] A valve seat 1 has a hollow cavity structure, is provided with a soda lime tank interface 16, an air outlet interface 2, a machine-controlled ventilation inlet 11 and a manual ventilation inlet 12, wherein the machine-controlled ventilation inlet 11 and the manual ventilation inlet 12 are respectively used for connecting the machine-controlled channel and the manual channel of the anesthesia machine; the valve seat 1 is further provided with a valve port 14 at a position corresponding to the air outlet interface 2 and the manual ventilation inlet 12;

[0062] A valve rod 4 is arranged in the hollow cavity of the valve seat 1 and can reciprocate along the axis relative to the valve seat 1;

[0063] A sealing gasket 10 is mounted to the valve rod 4 and located at a position corresponding to the valve port 14, and is used for sealingly cooperating with a first side or a second side of the valve port 14 when the valve rod 4 moves to a first position or a second position, so as to realize switching of the ventilation channel; and

[0064] A driving source is used for driving the valve rod 4 to move between the first position and the second position;

[0065] Under the action of the driving source, the valve rod 4 moves to the first position, so that the sealing gasket 10 closes the manual ventilation inlet 12 and opens the machine-controlled ventilation inlet 11; under the action of the driving source, the valve rod 4 returns to the second position from the first position, so that the sealing gasket 10 closes the machine-controlled ventilation inlet 11 and opens the manual ventilation inlet 12, thereby realizing automatic switching of the ventilation channel.

[0066] The anesthesia machine provided in the embodiment integrates the manual-machine-controlled switching valve device described in the embodiment 1, and realizes automatic switching between the machine-controlled ventilation channel and the manual ventilation channel through cooperation of the valve seat 1, the valve rod 4, the sealing gasket 10 and the driving source. The device has compact structure, all ventilation channels and switching structures are integrated in the hollow cavity of the valve seat 1, and the installation and layout of the overall system are facilitated. In the switching process, the valve rod 4 moves along the axis under the action of the driving source, drives the sealing gasket 10 to sealingly cooperate with the first side or the second side of the valve port 14, reliably realizes closing and opening of the ventilation channel, improves the sealing performance and prevents gas leakage. Meanwhile, the limiting structure arranged in cooperation ensures that the position of the sealing gasket 10 is accurate and the deformation is controlled in the working process, and the sealing reliability and service life of the device are further enhanced. The device can automatically switch to the manual ventilation mode through the reset structure when the driving source is disconnected, thereby guaranteeing the continuity of the gas path and the safety of the equipment in the anesthesia process. Therefore, the anesthesia machine comprising the switching valve device has good gas path control ability and emergency adaptive ability, and is suitable for application scenarios requiring automatic switching of manual ventilation and machine-controlled ventilation.

[0067] Finally, it should be noted that the above examples are merely intended to illustrate the technical solutions of the present application and not to limit. Although the present application is described in detail with reference to the examples, those skilled in the art should understand that modifications or equivalent replacements to the technical solutions of the present application are not deviated from the spirit and scope of the present application, and they should be covered in the scope of claims of the present application.

Claims

1. A manual machine-controlled switching valve device, used for switching the air path between the machine-controlled ventilation channel and the manual ventilation channel of an anesthesia machine, characterized in that: include: The valve seat (1) has a hollow cavity structure and is provided with a soda lime tank interface (16), an air outlet interface (2), a machine-controlled ventilation inlet (11) and a manual ventilation inlet (12), wherein the machine-controlled ventilation inlet (11) and the manual ventilation inlet (12) are respectively used to connect a machine-controlled channel and a manual channel of an anesthesia machine; the valve seat (1) is further provided with a valve port (14) at positions corresponding to the air outlet interface (2) and the manual ventilation inlet (12); A valve stem (4) is disposed in a hollow cavity within the valve seat (1) and is capable of reciprocating relative to the valve seat (1) in an axial direction; a sealing gasket (10) mounted on the valve stem (4) and located at a corresponding position of the valve port (14), and configured to seal with a first side or a second side of the valve port (14) when the valve stem (4) moves to a first position or a second position, respectively, to achieve switching of the ventilation channel; and a driving source for driving the valve stem (4) to move between a first position and a second position; Wherein, under the action of the driving source, the valve stem (4) moves to the first position, causing the sealing gasket (10) to close the manual ventilation inlet (12) and open the machine-controlled ventilation inlet (11); under the action of the driving source, the valve stem (4) returns from the first position to the second position, causing the sealing gasket (10) to close the machine-controlled ventilation inlet (11) and open the manual ventilation inlet (12), thereby realizing automatic switching of the ventilation channel.

2. The manual machine-controlled switching valve device according to claim 1, characterized in that: The driving source includes: an electric actuator.

3. The manual machine-controlled switching valve device according to claim 1, characterized in that: It also includes an end cover (7), the driving source includes: driving gas and a return spring (6), wherein, The end cover (7) is connected to the valve seat (1), and the driving gas inlet (3) of the driving gas is located on the end cover (7); The valve seat (1) is provided with a guide hole (13) at a position corresponding to the driving gas inlet (3); The valve stem (4) is provided with a force-bearing portion (17) at one end close to the driving gas inlet (3), the force-bearing portion (17) is located in the guide hole (13), and the side wall of the force-bearing portion (17) is sealed and matched with the guide hole (13) for receiving the force of the driving gas to push the valve stem (4) to move; A first limiting portion (15) is provided in the valve seat (1); the return spring (6) is arranged around the valve stem (4) and is located between the first limiting portion (15) and the force-bearing portion (17); Under the action of the driving gas, the force-bearing portion (17) pushes the valve stem (4) to the first position, causing the sealing gasket (10) to close the manual ventilation inlet (12) and open the machine-controlled ventilation inlet (11); when the driving gas is turned off, the return spring (6) pushes the valve stem (4) back to the second position, causing the sealing gasket (10) to close the machine-controlled ventilation inlet (11) and open the manual ventilation inlet (12), thereby realizing automatic switching of the ventilation channel.

4. The manual machine-controlled switching valve device according to claim 3, characterized in that: Also includes: The second limiting portion (18) and the opening retaining ring (9); wherein, The second limiting portion (18) is arranged in the valve seat (1) and cooperates with the first end of the valve stem (4) to form a first mechanical limit for limiting the first position; The opening retaining ring (9) is sleeved on the valve stem (4) and cooperates with the first limiting portion (15) to form a second mechanical limit for limiting the second position.

5. The manual machine-controlled switching valve device according to claim 3, characterized in that: Also includes: a first sealing member, disposed on the outer side of the force-bearing portion (17) and used for sealing with the inner wall of the guide hole (13); and A second sealing member is provided between the valve seat (1) and the end cover (7).

6. The manual machine-controlled switching valve device according to claim 3, characterized in that: The manual ventilation inlet (12) is arranged along the axis of the valve stem (4), and the axes of the air outlet interface (2) and the machine-controlled ventilation inlet (11) are perpendicular to the axis of the valve stem (4); the air outlet interface (2) is arranged close to the manual ventilation inlet (12), and the machine-controlled ventilation inlet (11) is arranged away from the air outlet interface (2); the valve port (14) is arranged at the intersection of the axes of the air outlet interface (2) and the manual ventilation inlet (12), and has a first valve port side and a second valve port side that are opposite to each other.

7. The manual machine-controlled switching valve device according to claim 3, characterized in that: The guide hole (13) is provided at an end of the valve seat (1) away from the manual ventilation inlet (12) and is sealedly connected to the end cover (7).

8. The manual machine-controlled switching valve device according to claim 3, characterized in that: The return spring (6) is a compression spring, one end of which abuts against the first limiting portion (15) and the other end abuts against the force-bearing portion (17), and is used to push the valve stem (4) back to its original position when the driving gas fails.

9. The manual machine-controlled switching valve device according to claim 1, characterized in that: The valve seat (1) is an integrally formed structure, or is formed by splicing a plurality of valve seat components, wherein the spliced ​​joints are sealed by a sealing member.

10. An anesthesia machine, characterized in that: It comprises the manual machine-controlled switching valve device described in any one of claims 1-9.

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