Gas passage switching system, pneumoperitoneum machine and gas supply system

Abstract

The invention relates to a gas passage switching system, a pneumoperitoneum machine and a gas supply system. The gas passage switching system comprises a first ventilation pipeline, a second gas pipeline, a gas pressure sensor, a pressure reducing valve, a control panel and an electric control valve, a first air inlet and a first air outlet are formed in the two ends of the first ventilation pipeline respectively, and the pressure reducing valve is arranged on the first ventilation pipeline and located between the first air inlet and the first air outlet; one end of the second gas pipeline is communicated between the first gas inlet and the pressure reducing valve, the other end of the second gas pipeline is communicated between the pressure reducing valve and the first gas outlet, and the electric control valve is arranged on the second gas pipeline; the air pressure sensor is arranged at the first air inlet, and the air pressure sensor and the electric control valve are electrically connected to the control panel.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of pneumostasis machines, in particular to a gas passage switching system, a pneumostasis machine and a gas supply system. BACKGROUND

[0002] A pneumostasis machine is a medical device frequently used in minimally invasive endoscopic surgery, which mainly functions to fill carbon dioxide gas into a patient's body, thereby supporting the patient's body cavity and providing a wide field of view for minimally invasive endoscopy.

[0003] In the prior art, there are mainly two sources of carbon dioxide gas, one of which is a cylinder gas source and the other of which is a hospital central gas supply source. The gas supply pressure of the hospital central gas supply source is 1 bar-4 bar, while the gas supply pressure of the cylinder gas source is as high as 60 bar-80 bar. Since the gas supply mechanism in the pneumostasis machine can at most match a gas pressure environment of about 10 bar, in the case of using the cylinder gas source, a pressure reducing mechanism needs to be correspondingly provided in the pneumostasis machine, so that the pressure of the carbon dioxide when it reaches the gas supply mechanism in the pneumostasis machine is reduced to below 10 bar. Conversely, in the case of using the hospital central gas supply source, the carbon dioxide will be directly delivered to the gas supply mechanism in the pneumostasis machine without passing through the pressure reducing mechanism, thereby avoiding excessively low gas pressure at the gas supply mechanism in the pneumostasis machine.

[0004] Based on the above reasons, the pneumostasis machine is usually provided with two gas inlets, which are respectively used to connect the cylinder gas source and the hospital central gas supply source. During the surgery, the medical staff need to connect the carbon dioxide gas source to the corresponding gas inlet in order to normally perform the surgery. In other words, the medical staff need to identify and judge the type of gas source and the gas inlet during the process of connecting the carbon dioxide gas source to the corresponding gas inlet, which not only reduces the efficiency of the surgery, but also has the risk of identification error, thereby reducing the safety of the surgery process. SUMMARY

[0005] Therefore, it is necessary to provide a gas passage switching system, a pneumostasis machine and a gas supply system to solve the problems of insufficient efficiency and safety in minimally invasive endoscopic surgery.

[0006] A gas passage switching system comprises a first ventilation pipeline, a second gas pipeline, a gas pressure sensor, a pressure reducing valve, a control panel and an electrically controlled valve.

[0007] Both ends of the first ventilation pipeline are respectively a first gas inlet and a first gas outlet, and the pressure reducing valve is arranged on the first ventilation pipeline and located between the first gas inlet and the first gas outlet.

[0008] One end of the second gas pipeline is communicated between the first gas inlet and the pressure reducing valve, and the other end of the second gas pipeline is communicated between the pressure reducing valve and the first gas outlet, and the electric control valve is arranged on the second gas pipeline;

[0009] The gas pressure sensor is arranged at the first gas inlet, and the gas pressure sensor and the electric control valve are electrically connected to the control panel.

[0010] In one of the embodiments, the gas passage switching system further comprises a safety valve arranged on the first gas pipeline and located between the pressure reducing valve and the first gas outlet, and the electric control valve and the pressure reducing valve are connected in parallel to the safety valve.

[0011] In one of the embodiments, the electric control valve comprises a valve body, a valve core and a partition plate, the partition plate is fixed in the valve body, and the valve core is movably arranged in the valve body;

[0012] The valve body is provided with a second gas inlet and a second gas outlet, the second gas inlet and the second gas outlet are located on two sides of the partition plate respectively, and the partition plate is provided with a gas passage hole;

[0013] The electric control valve has a conducting state and a closed state;

[0014] When the electric control valve is in the closed state, the valve core blocks the gas passage hole;

[0015] When the electric control valve is in the conducting state, the valve core avoids the gas passage hole to allow the second gas inlet and the second gas outlet to conduct through the gas passage hole.

[0016] In one of the embodiments, the second gas pipeline comprises a first branch pipe and a second branch pipe, one end of the first branch pipe is communicated between the first gas inlet and the pressure reducing valve, the other end of the first branch pipe is communicated to the second gas inlet, one end of the second branch pipe is communicated to the second gas outlet, and the other end of the second branch pipe is communicated between the pressure reducing valve and the first gas outlet.

[0017] In one of the embodiments, the electric control valve comprises an electromagnet, and the electromagnet is electrically connected to the control panel;

[0018] When the electric control valve is in the conducting state, the electromagnet magnetically attracts the valve core.

[0019] In one of the embodiments, the electric control valve comprises an elastic member, and two ends of the elastic member are arranged on the valve core and the electromagnet respectively;

[0020] When the electrically controlled valve is in the open state, the elastic member is in the compressed state;

[0021] When the electrically controlled valve is in the closed state, the elastic member presses the valve core against the partition plate.

[0022] In one embodiment, when the electrically controlled valve is in the closed state, the valve core is in contact with the sidewall of the vent hole.

[0023] In one embodiment, the vent hole has a larger aperture at the end close to the second gas inlet than at the end close to the second gas outlet.

[0024] A gas insufflation machine comprising the gas passage switching system and a gas supply assembly, and the first gas outlet is connected to the gas supply assembly.

[0025] A gas supply system comprising a gas source and the gas insufflation machine, and the gas source is connected to the first gas inlet.

[0026] The present application has the following advantages:

[0027] The gas pressure sensor is used to detect the gas pressure at the first gas inlet and transmit the pressure value to the control panel.

[0028] When the control panel determines that the gas pressure at the first gas inlet is high, it will control the electrically controlled valve to close, so that the gas at the first gas inlet cannot be delivered to the first gas outlet through the second gas pipeline, but only through the first vent pipeline. During the delivery of the gas from the first gas inlet to the first gas outlet, the gas will inevitably be decompressed by the pressure reducing valve, thereby avoiding excessive gas pressure at the first gas outlet.

[0029] When the control panel determines that the gas pressure at the first gas inlet is low, it will control the electrically controlled valve to open, and the gas at the first gas inlet can be delivered to the first gas outlet through the second gas pipeline. At the same time, since the gas pressure at the first gas inlet is small, the resistance of the pressure reducing valve to the gas flow cannot be ignored, so most of the gas at the first gas inlet is delivered to the first gas outlet through the second gas pipeline, and only a small amount of gas at the first gas inlet is delivered to the first gas outlet through the first vent pipeline. Therefore, the gas pressure at the first gas outlet and the gas pressure at the first gas inlet can be maintained consistent, thereby avoiding the gas pressure at the first gas outlet being too low due to the action of the pressure reducing valve.

[0030] The gas passage switching system of the present application has only one first gas inlet for connecting a gas source, and regardless of whether the gas supply pressure of the gas source is high or low, the output gas pressure at the first gas outlet is relatively normal (not too high or too low), in other words, the first gas inlet does not have special restrictions on the gas supply pressure of the gas source.

[0031] Based on the above two reasons, during the operation, the medical staff does not need to identify the gas supply pressure of the gas source, nor does it need to select the first gas inlet. In this way, on the one hand, it can improve the efficiency of the medical staff connecting the gas source and the first gas inlet during the operation, thereby improving the operation efficiency, and on the other hand, it can reduce the risk of misconnection and misinstallation of the medical staff, and improve the operation safety. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of the gas supply system of the present application;

[0033] Figure 2 It is a structural schematic diagram of the electric control valve of the present application.

[0034] Reference signs:

[0035] 1, first ventilation pipeline; 11, first gas inlet; 12, first gas outlet; 2, second gas pipeline; 21, first branch pipe; 22, second branch pipe; 3, gas pressure sensor; 4, pressure reducing valve; 5, control board; 6, electric control valve; 61, valve body; 611, second gas inlet; 612, second gas outlet; 62, valve core; 63, partition plate; 631, ventilation hole; 64, electromagnet; 65, elastic member; 7, safety valve; 8, gas supply assembly; 9, gas source. DETAILED DESCRIPTION

[0036] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below. In the following description, a lot of specific details are set forth in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, therefore the present application is not limited by the specific embodiments disclosed below.

[0037] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0038] In addition, the terms "first", "second", etc. are used herein only to describe different instances, and are not used to denote or imply relative importance or a number of the technical features indicated. Thus, the features defined as "first", "second", etc. can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0039] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0040] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0041] It should be noted that when an element is referred to as "fixed to" or "provided on" another element, it can be directly on the other element or there can be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there can be a middle element. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and are not the only embodiment.

[0042] Embodiment:

[0043] As Figure 1 shown, the embodiment provides a gas supply system, which includes a gas source 9 and a gas insufflation machine, and the gas source 9 is used to supply gas to the gas insufflation machine.

[0044] The gas source 9 can be a cylinder gas source or a hospital central gas supply source. In other words, the gas supply pressure of the gas source 9 in the embodiment can be large or small.

[0045] The pneumoperitoneum machine comprises a gas passage switching system and a gas supply assembly 8. The gas passage switching system obtains gas supply from a gas source 9, and then delivers the gas to the gas supply assembly 8, and finally delivers the gas to the patient's body cavity by the gas supply assembly 8. When the gas supply pressure of the gas source 9 is large, the gas passage switching system needs to reduce the pressure of the gas after obtaining the gas supply, so that the pressure of the gas reaching the gas supply assembly 8 can match the pressure resistance performance of the gas supply assembly 8, thereby avoiding damage to the gas supply assembly 8; when the gas supply pressure of the gas source 9 is small, the gas passage switching system directly delivers the gas to the gas supply assembly 8 after obtaining the gas supply, without the need to reduce the pressure of the gas, thereby avoiding that the gas supply pressure of the gas supply assembly 8 to the patient's body cavity is too small.

[0046] Specifically, the gas passage switching system of the embodiment comprises a first ventilation pipeline 1, a second gas pipeline 2, a gas pressure sensor 3, a pressure reducing valve 4, a control board 5 and an electrically controlled valve 6.

[0047] The first ventilation pipeline 1 has a first gas inlet 11 and a first gas outlet 12 at two ends thereof. The gas source 9 is connected to the first gas inlet 11, and the first gas outlet 12 is connected to the gas supply assembly 8. The gas passage switching system obtains gas supply from the gas source 9 through the first gas inlet 11, and delivers the gas to the gas supply assembly 8 through the first gas outlet 12.

[0048] The pressure reducing valve 4 is arranged on the first ventilation pipeline 1 and located between the first gas inlet 11 and the first gas outlet 12. One end of the second gas pipeline 2 is connected between the first gas inlet 11 and the pressure reducing valve 4, and the other end of the second gas pipeline 2 is connected between the pressure reducing valve 4 and the first gas outlet 12. The electrically controlled valve 6 is arranged on the second gas pipeline 2. In this way, the pressure reducing valve 4 and the electrically controlled valve 6 are connected in parallel between the first gas inlet 11 and the first gas outlet 12 in the gas passage.

[0049] The gas pressure sensor 3 is arranged at the first gas inlet 11 and used to detect the gas pressure at the first gas inlet 11. The gas pressure sensor 3 and the electrically controlled valve 6 are electrically connected to the control board 5. The gas pressure sensor 3 transmits the gas pressure value at the first gas inlet 11 to the control board 5, and the control board 5 controls the opening and closing of the electrically controlled valve 6 based on the gas pressure value at the first gas inlet 11.

[0050] The operation process of the gas passage switching system of the embodiment is as follows:

[0051] When the control board 5 judges that the gas pressure value at the first gas inlet 11 is higher, the electrically controlled valve 6 will be controlled to be closed, so that the gas at the first gas inlet 11 cannot be delivered to the first gas outlet 12 through the second gas pipeline 2, but can only be delivered to the first gas outlet 12 through the first gas pipeline 1. In other words, during the delivery of the gas from the first gas inlet 11 to the first gas outlet 12, the gas must pass through the pressure reducing valve 4 and be reduced in pressure by the pressure reducing valve 4, so that the gas pressure at the gas supply assembly 8 can be prevented from being too high.

[0052] When the control board 5 judges that the gas pressure value at the first gas inlet 11 is lower, the electrically controlled valve 6 will be controlled to be opened, so that the gas at the first gas inlet 11 can be delivered to the first gas outlet 12 through the second gas pipeline 2. At the same time, since the gas supply pressure at the first gas inlet 11 is small, the hindering effect of the pressure reducing valve 4 on the gas flow cannot be ignored, so that most of the gas at the first gas inlet 11 is delivered to the first gas outlet 12 through the second gas pipeline 2, and only a small amount of gas at the first gas inlet 11 is delivered to the first gas outlet 12 through the first gas pipeline 1. Therefore, the gas pressure at the first gas outlet 12 and the gas pressure at the first gas inlet 11 can be generally maintained consistent, so that the gas pressure at the gas supply assembly 8 can be prevented from being too low due to the effect of the pressure reducing valve 4.

[0053] In other words, no matter whether the gas pressure value at the first gas inlet 11 is high or low, the gas pressure value output at the first gas outlet 12 is normal, and will not be too high or too low, so that the first gas inlet 11 will not excessively limit the gas pressure of the gas source 9 connected thereto.

[0054] Further, since the gas passage switching system of the embodiment only has one first gas inlet 11 for connecting the gas source 9, and the first gas inlet 11 does not have a special limitation on the gas supply pressure of the gas source 9, during the operation, the medical staff does not need to identify the gas supply pressure of the gas source 9, nor need to select more than two first gas inlets 11. In this way, the medical staff can effectively improve the installation efficiency during the connection of the gas source 9 to the first gas inlet 11, so as to improve the operation efficiency, and at the same time, can reduce the risk of incorrect installation of the medical staff, and improve the safety of the operation.

[0055] As a preferred, the gas passage switching system of the embodiment further comprises a safety valve 7, the safety valve 7 is arranged on the first gas pipeline 1, and the safety valve 7 is located between the pressure reducing valve 4 and the first gas outlet 12. On the gas path level, the electrically controlled valve 6 and the pressure reducing valve 4 are connected in parallel to the safety valve 7. In this way, when the electrically controlled valve 6 and the pressure reducing valve 4 are damaged, the safety valve 7 can perform emergency pressure relief, so as to avoid damage to the first gas pipeline 1 and the second gas pipeline 2.

[0056] Further, the second gas pipeline 2 comprises a first branch pipe 21 and a second branch pipe 22, and the electrically-controlled valve 6 is arranged between the first branch pipe 21 and the second branch pipe 22 to control the conduction and disconnection between the first branch pipe 21 and the second branch pipe 22. The one end of the first branch pipe 21 is communicated between the first gas inlet 11 and the pressure-reducing valve 4, the other end of the first branch pipe 21 is communicated to the electrically-controlled valve 6, the one end of the second branch pipe 22 is communicated to the electrically-controlled valve 6, and the other end of the second branch pipe 22 is communicated between the pressure-reducing valve 4 and the first gas outlet 12.

[0057] As shown in Figure 2 The electrically-controlled valve 6 comprises a valve body 61, a valve core 62 and a partition plate 63.

[0058] The valve body 61 is provided with a second gas inlet 611 and a second gas outlet 612, the end of the first branch pipe 21 is communicated to the second gas inlet 611, the end of the second branch pipe 22 is communicated to the second gas outlet 612, and the valve core 62 is movably arranged in the valve body 61 to control the conduction or disconnection between the second gas inlet 611 and the second gas outlet 612.

[0059] The partition plate 63 is fixed in the valve body 61, the partition plate 63 is provided with a vent hole 631, and the second gas inlet 611 and the second gas outlet 612 are located on the two sides of the partition plate 63. The electrically-controlled valve 6 has a conduction state and a closed state; when the electrically-controlled valve 6 is in the closed state, the valve core 62 blocks the vent hole 631, so that the second gas inlet 611 and the second gas outlet 612 are disconnected; when the electrically-controlled valve 6 is in the conduction state, the valve core 62 avoids the vent hole 631, so that the second gas inlet 611 and the second gas outlet 612 can be conducted through the vent hole 631.

[0060] For example, the electrically-controlled valve 6 further comprises an electromagnet 64 and an elastic member 65. The electromagnet 64 is electrically connected to the control panel 5, and the control panel 5 can control the electromagnet 64 to generate or lose magnetism. The two ends of the elastic member 65 are arranged on the valve core 62 and the electromagnet 64 respectively, and the elastic member 65 is always in a compressed state.

[0061] When the electrically-controlled valve 6 is in the conduction state, the electromagnet 64 generates magnetism and magnetically attracts the valve core 62, so that the valve core 62 avoids the vent hole 631, and the valve core 62 further extrudes the elastic member 65, and the compression state of the elastic member 65 is aggravated.

[0062] When the electrically-controlled valve 6 is in the closed state, the electromagnet 64 loses magnetism, so that the compression degree of the elastic member 65 is reduced and a certain recovery is generated, and the elastic member 65 presses the valve core 62 on the partition plate 63, so that the valve core 62 seals the vent hole 631.

[0063] Especially, when the air pressure at the first air inlet 11 is high, and the valve core 62 blocks the air hole 631, the air pressure at the second air inlet 611 is also high, and the air pressure at the second air outlet 612 is relatively low. Thus, under the action of the air pressure difference, the valve core 62 can further increase the pressure on the partition plate 63, and improve the blocking effect of the valve core 62 on the air hole 631.

[0064] When the electromagnet 64 generates magnetism, the magnetic attraction force generated by the electromagnet 64 on the valve core 62 needs to overcome not only the elasticity of the elastic member 65, but also the pressure difference between the second air inlet 611 and the second air outlet 612, so that the electric control valve 6 gradually changes from the closed state to the open state. In other words, if the air pressure at the second air inlet 611 is large, even if the electromagnet 64 is powered, the electromagnet 64 may not be able to generate enough magnetic attraction force to make the valve core 62 leave the air hole 631. That is, in the case that the air pressure at the first air inlet 11 is high, the electric control valve 6 is likely to be in a state that cannot be opened, thereby effectively reducing the occurrence of the electric control valve 6 misopening.

[0065] Preferably, when the electric control valve 6 is in the closed state, the valve core 62 is in contact with the side wall of the air hole 631, so that the contact area between the valve core 62 and the side wall of the air hole 631 is increased, and the blocking effect of the valve core 62 on the air hole 631 is improved.

[0066] Further preferably, the air hole 631 gradually decreases in diameter in the axial direction thereof. The diameter of the end of the air hole 631 close to the second air inlet 611 is greater than the diameter of the end of the air hole 631 close to the second air outlet 612. For example, the side wall of the air hole 631 in the embodiment is a circular truncated cone, and the end side wall of the valve core 62 is a circular cone. Thus, under the joint action of the elastic member 65 and the air pressure difference, the circular truncated cone is pressed on the circular cone, and the valve core 62 can generate a positive pressure on the side wall of the air hole 631, so as to further improve the blocking effect of the valve core 62 on the air hole 631.

[0067] Any combination of the technical features of the above-described embodiments can be made. In order to make the description simple, all possible combinations of the technical features in the above-described embodiments are not described, however, as long as the combinations of the technical features do not exist, they should be considered as the scope of the description.

[0068] The above-described embodiments only express several implementation manners of the present application, the description is relatively specific and detailed, but it should not be understood as a limitation on the scope of the patent. It should be pointed out that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A gas passage switching system characterized by comprising: The gas passage switching system comprises a first gas passage (1), a second gas passage (2), a gas pressure sensor (3), a pressure reducing valve (4), a control board (5) and an electrically controlled valve (6); Two ends of the first gas passage (1) are respectively a first gas inlet (11) and a first gas outlet (12), and the pressure reducing valve (4) is arranged on the first gas passage (1) and located between the first gas inlet (11) and the first gas outlet (12); One end of the second gas passage (2) is communicated between the first gas inlet (11) and the pressure reducing valve (4), and the other end of the second gas passage (2) is communicated between the pressure reducing valve (4) and the first gas outlet (12), and the electrically controlled valve (6) is arranged on the second gas passage (2); The gas pressure sensor (3) is arranged at the first gas inlet (11), and the gas pressure sensor (3) and the electrically controlled valve (6) are electrically connected to the control board (5).

2. The gas passage switching system according to claim 1, characterized by, The gas passage switching system further comprises a safety valve (7), the safety valve (7) is arranged on the first gas passage (1) and located between the pressure reducing valve (4) and the first gas outlet (12), and the electrically controlled valve (6) and the pressure reducing valve (4) are connected in parallel to the safety valve (7).

3. The gas passage switching system according to claim 1, characterized by, The electrically controlled valve (6) comprises a valve body (61), a valve core (62) and a partition plate (63), the partition plate (63) is fixed in the valve body (61), and the valve core (62) is movably arranged in the valve body (61); The valve body (61) is provided with a second gas inlet (611) and a second gas outlet (612), the second gas inlet (611) and the second gas outlet (612) are located on two sides of the partition plate (63), and the partition plate (63) is provided with a gas passage hole (631); The electrically controlled valve (6) has a conducting state and a closed state; When the electrically controlled valve (6) is in the closed state, the valve core (62) blocks the gas passage hole (631); When the electrically controlled valve (6) is in the conducting state, the valve core (62) avoids the gas passage hole (631) to allow the second gas inlet (611) and the second gas outlet (612) to conduct through the gas passage hole (631).

4. The gas passage switching system according to claim 3, characterized by The second gas passage (2) comprises a first branch pipe (21) and a second branch pipe (22), one end of the first branch pipe (21) is communicated between the first gas inlet (11) and the pressure reducing valve (4), the other end of the first branch pipe (21) is communicated to the second gas inlet (611), one end of the second branch pipe (22) is communicated to the second gas outlet (612), and the other end of the second branch pipe (22) is communicated between the pressure reducing valve (4) and the first gas outlet (12).

5. The gas passage switching system according to claim 3, wherein The electrically controlled valve (6) comprises an electromagnet (64), and the electromagnet (64) is electrically connected to the control board (5); When the electrically controlled valve (6) is in the conducting state, the electromagnet (64) magnetically attracts the valve core (62).

6. The gas passage switching system according to claim 5, wherein The electrically controlled valve (6) comprises an elastic member (65), two ends of the elastic member (65) are arranged on the valve core (62) and the electromagnet (64) respectively; When the electrically controlled valve (6) is in the on state, the elastic member (65) is in the compressed state; When the electrically controlled valve (6) is in the off state, the elastic member (65) presses the valve core (62) on the partition plate (63).

7. The gas passage switching system according to claim 5, wherein When the electrically controlled valve (6) is in the off state, the valve core (62) is attached to the side wall of the vent hole (631).

8. The gas passage switching system according to claim 7, characterized by, The end aperture of the vent hole (631) close to the second gas inlet (611) is larger than the end aperture of the vent hole (631) close to the second gas outlet (612).

9. A pneumostachion, characterized in that The gas passage switching system and the gas supply assembly (8) as claimed in any one of claims 1-8, the first gas outlet (12) is communicated to the gas supply assembly (8).

10. A gas supply system characterized by, The insufflator as claimed in claim 9, the gas source (9) is communicated to the first gas inlet (11).

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