Anesthesia circuit pressure relief device and anesthesia machine

Abstract

The application belongs to the technical field of medical apparatus and instruments, and particularly relates to an anesthesia circuit pressure relief device and an anesthesia machine. In the anesthesia circuit pressure relief device, a driving channel, an anesthesia channel, a first airway hole and a groove communicating with the anesthesia channel are arranged on a base, a gas outlet joint is arranged in the groove, a first inner hole communicating with the groove and the driving channel is arranged in the gas outlet joint, an overflow valve is sealingly arranged in the groove and is used for plugging or opening the first inner hole, a first space is arranged on a bottom cover, the first space and the first inner hole are respectively located at opposite ends of the overflow valve, opposite ends of the first airway hole respectively communicate with the driving channel and the first space, a driving gas hole and an anesthesia gas hole are further arranged on the bottom cover, the driving channel communicates with an internal space through the driving gas hole, and the anesthesia channel communicates with a gas storage space through the anesthesia gas hole. In the application, the anesthesia circuit pressure relief device can complete pressure relief work, and has simple structure and low manufacturing cost.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, and in particular relates to an anesthesia circuit depressurization device and an anesthesia machine. Background Technology

[0002] An anesthesia machine delivers anesthetic drugs into the patient's alveoli via a mechanical circuit. This creates a partial pressure of anesthetic gas, which diffuses into the bloodstream and directly inhibits the central nervous system, resulting in general anesthesia. The delivery of anesthetic gas relies on its internal gas pathway system. This system generates and delivers anesthetic gas to the patient's alveoli. The gas pathway system includes a breathing circuit, through which exhaled gas or unused anesthetic gas can be delivered. The breathing circuit can then re-introduce unused anesthetic gas into the patient's body for use.

[0003] In the breathing circuit of anesthesia machines, anesthetic gas needs to be delivered to the patient's lungs, and the patient's exhaled air also contains anesthetic gas, so the patient's exhaled air cannot be directly discharged into the external environment.

[0004] In existing technologies, anesthesia machines typically include an anesthesia circuit mechanism for delivering anesthetic gases. To ensure patient breathing safety, this circuit mechanism is equipped with a pressure relief valve. When the pressure of the patient's exhaled gas is too high, the valve opens to release the pressure. However, the pressure relief valve directly outputs the patient's exhaled anesthetic gas into the external environment, causing anesthetic gas leakage. Furthermore, the pressure relief valve is not very safe and can pose a significant safety risk to the patient. In addition, anesthesia circuit mechanisms with pressure relief valves are structurally complex and have high manufacturing costs. Summary of the Invention

[0005] This invention addresses the technical problems of high safety risks and complex structures in existing anesthesia circuit mechanisms by providing an anesthesia circuit depressurization device and an anesthesia machine.

[0006] In view of the above technical problems, the present invention provides an anesthesia circuit depressurization device, including a base, an overflow valve, a bottom cover, a folded bladder with a gas storage space, and a bellows with an internal space; the bottom cover is installed on the base, the folded bladder and the bellows are both installed on the bottom cover, and the folded bladder is located in the internal space;

[0007] The base is provided with a drive channel, an anesthesia channel, a first airway hole, and a groove connecting the anesthesia channel. An air outlet connector is provided within the groove, and the air outlet connector has a first inner hole connecting the groove and the drive channel. An overflow valve is sealed and installed within the groove, and the overflow valve is used to block or open the first inner hole. The bottom cover is provided with a first space, and the first space and the first inner hole are located at opposite ends of the overflow valve. The opposite ends of the first airway hole connect the drive channel and the first space, respectively. The bottom cover is also provided with a drive air hole and an anesthesia air hole. The drive channel connects to the internal space through the drive air hole, and the anesthesia channel connects to the gas storage space through the anesthesia air hole.

[0008] When the overflow valve blocks the first inner hole, the anesthetic gas in the anesthesia channel is input into the gas storage space through the anesthetic gas hole, and the gas in the gas storage space is forced into the anesthesia channel under the pressure of the driving gas in the internal space;

[0009] When the overflow valve opens into the first channel groove, the gas in the anesthesia channel is input into the drive channel through the groove and the first inner hole.

[0010] Optionally, the base is provided with a protruding arm, and the protruding arm is provided with a plug-in groove; the bellows is provided with a plug-in part, and the bellows is installed on the bottom cover by the plug-in part inserted into the plug-in groove.

[0011] Optionally, the base includes a top plate, a partition plate, and a bottom plate, the partition plate being sealed between the top plate and the bottom plate, and the first air passage and the groove being provided on the top plate;

[0012] The drive channel includes a first channel groove disposed on the base plate, a first air hole disposed on the partition plate, and a second channel groove disposed on the top plate. The first channel groove is connected to the second channel groove through the first air hole. The first air hole and the first inner hole are both connected to the second channel groove.

[0013] The anesthesia channel includes a third channel groove and a fourth channel groove disposed on the top plate, a second air hole and a third air hole disposed on the partition plate, and a fifth channel groove disposed on the bottom plate; the third channel groove sequentially connects to the fourth channel groove through the second air hole, the fifth channel groove and the third air hole, and the fourth channel groove connects to the groove and the anesthesia air hole.

[0014] Optionally, the vent valve includes a diaphragm installed in the groove and a counterweight installed on the diaphragm and located in the first space, the diaphragm being used to block or open the first inner hole.

[0015] Optionally, the bellows is made of a transparent material and has scale lines on it for indicating the compression of the folded bladder.

[0016] Optionally, the base is provided with an annular protrusion, and the anesthesia circuit pressure relief device further includes a sealing sleeve fitted onto the annular protrusion; the sealing sleeve is provided with an annular insertion groove, and the bottom cover is provided with an annular insertion part; the bottom cover is installed on the base through the annular insertion part inserted into the annular insertion groove, and the sealing sleeve abuts against the inner wall of the internal space.

[0017] Optionally, the bottom cover has a protruding insertion portion at one end away from the base, and the folding bladder is installed on the bottom cover by inserting the protruding insertion portion into the gas storage space.

[0018] Another embodiment of the present invention provides an anesthesia machine, including the above-described anesthesia circuit depressurization device.

[0019] Optionally, the anesthesia machine further includes a carbon dioxide absorption tank and a gas supply port, the anesthesia channel is connected to the patient's respiratory end through the carbon dioxide absorption tank, and the gas supply port is connected to the pipeline between the anesthesia channel and the carbon dioxide absorption tank.

[0020] In this invention, when the pressure at the upper end of the overflow valve is less than the pressure at the lower end of the overflow valve, the overflow valve moves upward to open the first inner hole; the anesthetic gas exhaled by the patient is input into the groove through the anesthesia channel, and the anesthetic gas in the groove enters the anesthesia channel through the first inner hole, and finally exits from the anesthesia channel to complete the depressurization of the exhaled gas, thus preventing high-pressure anesthetic gas from entering the gas storage space of the folded bag and affecting the patient's inhalation, ensuring the safety of the patient's inhalation and exhalation; when the patient inhales, the driving gas in the internal space can force the anesthetic gas in the folded bag into the patient's lungs, so that there is no need to set up a separate driving device to input the gas in the folded bag into the patient's lungs, thus the structure of the anesthesia circuit depressurization device is simple and the manufacturing cost is low. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Figure 1 This is a schematic diagram of the structure of an anesthesia circuit pressure relief device provided in an embodiment of the present invention;

[0023] Figure 2 This is a cross-sectional view of an anesthesia circuit depressurization device provided in an embodiment of the present invention;

[0024] Figure 3This is a schematic diagram of the structure of the bottom cover of the anesthesia circuit pressure relief device provided in an embodiment of the present invention, mounted on the base;

[0025] Figure 4 This is a schematic diagram of the top plate of the anesthesia circuit pressure relief device provided in an embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of the top plate of the anesthesia circuit pressure relief device provided in one embodiment of the present invention from another perspective;

[0027] Figure 6 This is a schematic diagram of the structure of the partition of the anesthesia circuit pressure relief device provided in an embodiment of the present invention;

[0028] Figure 7 This is a schematic diagram of the structure of the base plate of the anesthesia circuit pressure relief device provided in an embodiment of the present invention.

[0029] The reference numerals in the accompanying drawings are as follows:

[0030] 1. Base; 11. Drive channel; 111. First channel groove; 112. First air hole; 113. Second channel groove; 12. Anesthesia channel; 121. Third channel groove; 122. Fourth channel groove; 123. Second air hole; 124. Third air hole; 125. Fifth channel groove; 13. First airway hole; 14. Groove; 15. Air outlet connector; 151. First inner hole; 16. Protruding arm; 161. Insertion groove; 17. Top plate; 18. Partition plate; 19. Bottom plate; 101. Annular protrusion; 2. Overflow valve; 3. Bottom cover; 31. First space; 32. Drive air hole; 33. Anesthesia air hole; 34. Annular insertion part; 35. Protruding insertion part; 4. Folding bag; 41. Gas storage space; 5. Bellows; 51. Internal space; 52. Insertion part; 6. Sealing sleeve. Detailed Implementation

[0031] To make the technical problems solved, the technical solutions, and the beneficial effects of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention.

[0032] It should be understood that the terms "upper", "lower", "left", "right", "front", "rear", "middle", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations of the present invention.

[0033] like Figure 1 and Figure 2As shown, an embodiment of the present invention provides an anesthesia circuit depressurization device, including a base 1, an overflow valve 2, a bottom cover 3, a folded bladder 4 with a gas storage space 41, and a bellows 5 with an internal space 51; the bottom cover 3 is mounted on the base 1, the folded bladder 4 and the bellows 5 are both mounted on the bottom cover 3, and the folded bladder 4 is located in the internal space 51; it can be understood that the bottom cover 3 can block the opening at the bottom of the folded bladder 4 and the opening at the bottom of the bellows 5; there is a space between the folded bladder 4 and the bellows 5 for storing driving gas.

[0034] The base 1 is provided with a drive channel 11, an anesthesia channel 12, a first airway hole 13, and a groove 14 communicating with the anesthesia channel 12. An air outlet connector 15 is provided in the groove 14, and a first inner hole 151 communicating with the groove 14 and the drive channel 11 is provided in the air outlet connector 15. An overflow valve 2 is sealed and installed in the groove 14, and the overflow valve 2 is used to block or open the first inner hole 151. The bottom cover 3 is provided with a first space 31, and the first space 31 and the first inner hole 151 are respectively located at opposite ends of the overflow valve 2. The opposite ends of the first airway hole 13 communicate with the drive channel 11 and the first space 31 respectively. The bottom cover 3 is also provided with a drive air hole 32 and an anesthesia air hole 33, and the drive channel 11 communicates with the internal space through the drive air hole 32. In section 51, the anesthesia channel 12 is connected to the gas storage space 41 through the anesthetic gas port 33; understandably, the drive channel 11 is also connected to the first space through the first airway port 13, and the first inner hole 151 is also filled with drive gas; the anesthetic gas in the anesthesia channel 12 also enters the groove 14; the groove 14 is located on the upper part of the base 1, the gas outlet 15 extends upward, and the gas outlet 15 is located below the overflow valve 2; the drive channel 11 is connected to an external drive device (pump, etc.), so that the external drive device can input drive gas into the drive channel 11; the anesthesia channel 12 is connected to the patient's respiratory end, so that the gas exhaled by the patient can be delivered to the anesthesia channel 12, and the patient can inhale anesthetic gas from the anesthesia channel 12.

[0035] When the overflow valve 2 blocks the first inner hole 151, the anesthetic gas in the anesthesia channel 12 is input into the gas storage space 41 through the anesthetic gas port 33, and the gas in the gas storage space 41 is forced into the anesthesia channel 12 under the pressure of the driving gas in the internal space 51; specifically, when the pressure at the upper end of the overflow valve 2 is greater than the pressure at the lower end of the overflow valve 2, the overflow valve 2 moves downward and blocks the first inner hole 151 under the pressure of the driving gas in the first space 31 (at this time, it indicates that the ventilator is working normally and the gas exhaled by the patient is within the normal range); at this time, Part of the driving gas in the driving channel 11 enters the internal space 51 through the driving vent 32, and the other part enters the first inner hole 151. The anesthetic gas exhaled by the patient enters the anesthesia channel 12, and the anesthetic gas in the anesthesia channel 12 enters the gas storage space 41 through the anesthesia vent 33. The groove 14 is also filled with anesthetic gas. When the patient inhales, the driving gas in the internal space 51 compresses the anesthetic gas in the folded bag 4, and the anesthetic gas in the folded bag 4 is delivered to the patient's lungs through the anesthesia vent 33 and the driving channel 11. It should be noted that because the overflow valve 2 blocks the first inner hole 151, the driving gas in the first inner hole 151 will not flow into the anesthesia channel 12 through the groove 14.

[0036] When the overflow valve 2 opens into the first inner hole 151, the gas in the anesthesia channel 12 is input into the drive channel 11 through the groove 14 and the first inner hole 151. Understandably, when the pressure at the upper end of the overflow valve 2 is less than the pressure at the lower end of the overflow valve 2, the overflow valve 2 moves upward to open the first inner hole 151; the anesthetic gas exhaled by the patient is input into the groove 14 through the anesthesia channel 12, and the anesthetic gas in the groove 14 enters the anesthesia channel 12 through the first channel groove 111, finally exiting from the anesthesia channel 12 and being depressurized; when the patient inhales, the anesthetic gas in the groove 14 is depressurized due to inhalation, and the overflow valve 2 seals the first inner hole 151, thereby allowing the patient to inhale the anesthetic gas in the gas storage space 41 from the anesthesia channel 12 and the anesthetic gas port 33.

[0037] It should be noted that the overflow valve 2 opens the first channel slot 111. This situation may occur because the pressure of the anesthetic gas exhaled by the patient is too high, resulting in the pressure at the upper end of the overflow valve 2 being lower than the pressure at the lower end. At this time, the high-pressure anesthetic gas exhaled by the patient is output through the drive channel 11, thereby completing the depressurization of the patient's exhaled gas. Alternatively, it may be due to a malfunction of the anesthesia machine, resulting in the pressure of the drive gas in the drive channel 11 being too low, resulting in the pressure at the upper end of the overflow valve 2 being lower than the pressure at the lower end. At this time, the anesthetic gas exhaled by the patient can enter the drive channel 11 through the first inner hole 151. In this case, the anesthesia machine will alarm to prompt maintenance personnel to inspect the anesthesia machine.

[0038] In this invention, when the pressure at the upper end of the overflow valve 2 is less than the pressure at the lower end of the overflow valve 2, the overflow valve 2 moves upward to open the first inner hole 151; the anesthetic gas exhaled by the patient is input into the groove 14 through the anesthesia channel 12, and the anesthetic gas in the groove 14 enters the anesthesia channel 12 through the first inner hole 151, and finally exits from the anesthesia channel 12 to complete the depressurization of the exhaled gas, thus preventing high-pressure anesthetic gas from entering the gas storage space 41 of the folded bag 4 and affecting the patient's inhalation, ensuring the safety of the patient's inhalation and exhalation; when the patient inhales, the driving gas in the internal space 51 can force the anesthetic gas in the folded bag 4 into the patient's lungs, so that there is no need to set up a separate driving device to input the gas in the folded bag 4 into the patient's lungs, thus the structure of the anesthesia circuit depressurization device is simple and the manufacturing cost is low.

[0039] In one embodiment, such as Figure 1 As shown, the base 1 has a protruding arm 16, and the protruding arm 16 has a insertion groove 161; the bellows 5 has an insertion part 52, and the bellows 5 is mounted on the bottom cover 3 by the insertion part 52 inserted into the insertion groove 161. It can be understood that the base 1 has a plurality of protruding arms 16 arranged in a ring at intervals, and each protruding arm 16 has the insertion groove 161; correspondingly, the outer wall of the bellows 5 has a plurality of insertion parts 52 arranged at intervals. Specifically, the insertion part 52 of the bellows 5 can be screwed into the insertion groove 161 of the protruding arm 16, thereby ensuring the stability of the bellows 5 mounted on the bottom cover 3.

[0040] In one embodiment, such as Figures 3 to 7 As shown, the base 1 includes a top plate 17, a partition plate 18, and a bottom plate 19. The partition plate 18 is sealed between the top plate 17 and the bottom plate 19. The first air passage hole 13 and the groove 14 are both provided on the top plate 17. It can be understood that the groove 14 is provided on the top of the top plate 17.

[0041] The drive channel 11 includes a first channel groove 111 disposed on the base plate 19, a first air hole 112 disposed on the partition plate 18, and a second channel groove 113 disposed on the top plate 17. The first channel groove 111 is connected to the second channel groove 113 through the first air hole 112. The first air passage hole 13 and the first inner hole 151 are both connected to the second channel groove 113. It can be understood that the end of the first channel groove 111 away from the first air hole 112 is connected to an external drive component. Specifically, the drive gas output by the external drive component is sequentially input into the first air passage hole 13 and the drive air hole 32 through the first channel groove 111, the first air hole 112, and the second channel groove 113.

[0042] The anesthesia channel 12 includes a third channel groove 121 and a fourth channel groove 122 disposed on the top plate 17, a second air hole 123 and a third air hole 124 disposed on the partition plate 18, and a fifth channel groove 125 disposed on the bottom plate 19. The third channel groove 121 sequentially connects to the fourth channel groove 122 through the second air hole 123, the fifth channel groove 125, and the third air hole 124. The fourth channel groove 122 connects to the groove 14 and the anesthesia air hole 33. Understandably, the end of the third channel groove 121 away from the second air hole 123 is connected to the patient's breathing end. Specifically, the gas exhaled by the patient sequentially passes through the third channel groove 121, the second air hole 123, the fifth channel groove 125, and the third air hole 124 and is input into the fourth channel groove 122. A portion of the anesthetic gas in the fourth channel groove 122 is input into the gas storage space 41 through the anesthesia air hole 33, and another portion of the anesthetic gas enters the groove 14 through the first airway.

[0043] In this embodiment, the first channel groove 111, the third channel groove 121, and the fourth channel groove 122 on the top plate 17 are all recessed grooves with openings facing downwards, and the second channel groove 113 and the fifth channel groove 125 on the bottom plate 19 are both recessed grooves with openings facing upwards. The partition plate 18 can seal the first channel groove 111, the second channel groove 113, the third channel groove 121, the fourth channel groove 122, and the fifth channel groove 125. In this embodiment, the base 1 has a simple structure and low manufacturing cost.

[0044] In one embodiment, such as Figure 2As shown, the overflow valve 2 includes a diaphragm installed in the groove 14 and a counterweight installed on the diaphragm and located in the first space 31. The diaphragm is used to block or open the first inner hole 151. Understandably, the outer wall of the diaphragm abuts against the inner wall of the groove 14, the counterweight is installed on top of the diaphragm, and the diaphragm can be made of a flexible material. Specifically, the diaphragm is subjected to a downward force from the weight of the counterweight and the pressure of the driving gas in the first space 31, and an upward force from the pressure of the anesthetic gas in the first inner hole 151 and the pressure of the driving gas in the groove 14. In this embodiment, the overflow valve 2 is designed with a counterweight and a diaphragm so that the diaphragm can block the first inner hole 151 when the patient inhales, and the lower part of the diaphragm can be subjected to the pressure of the anesthetic gas in the first inner hole 151 and the pressure of the driving gas in the groove 14. Therefore, when the diaphragm opens the first inner hole 151, it can reflect problems such as a low pressure of the driving gas or a high pressure of the anesthetic gas exhaled by the patient.

[0045] In one embodiment, the bellows 5 is made of a transparent material and has graduations on it to indicate the compression of the pleated bag 4. Understandably, the bellows 5 can be made of glass, and the pleated bag 4 switches between expansion and contraction within the bellows 5 during the patient's breathing; the user can observe the state of the pleated bag 4 through the transparent bellows 5, allowing for direct observation of the breathing status. Additionally, the graduations can reflect the amount of anesthetic gas inhaled by the patient in the gas storage space 41.

[0046] In one embodiment, such as Figure 2 As shown, the base 1 has an annular protrusion 101, and the anesthesia circuit pressure relief device further includes a sealing sleeve 6 fitted onto the annular protrusion 101. The sealing sleeve 6 has an annular insertion groove, and the bottom cover 3 has an annular insertion part 34. The bottom cover 3 is mounted on the base 1 by the annular insertion part 34 inserted into the annular insertion groove, and the sealing sleeve 6 abuts against the inner wall of the internal space 51. Understandably, the annular protrusion 101 extends upwards; when the insertion part 52 of the bellows 5 is inserted into the insertion groove 161 of the protruding arm 16, the outer wall of the sealing sleeve 6 abuts against the inner wall of the internal space 51, thereby ensuring the airtightness of the bellows 5 mounted on the bottom cover 3.

[0047] In one embodiment, such as Figure 2 and Figure 3As shown, the bottom cover 3 has a protruding insertion part 35 at the end away from the base 1. The folded bladder 4 is mounted on the bottom cover 3 by inserting the protruding insertion part 35 into the air storage space 41. It can be understood that the protruding insertion part 35 is inserted into the air storage space 41 of the folded bladder 4 from the bottom, thereby improving the stability of the folded bladder 4 mounted on the bottom cover 3.

[0048] Another embodiment of the present invention provides an anesthesia machine, including the above-described anesthesia circuit depressurization device.

[0049] In one embodiment, the anesthesia machine further includes a carbon dioxide absorption canister and a gas replenishment port. The anesthesia channel 12 is connected to the patient's respiratory end through the carbon dioxide absorption canister, and the gas replenishment port is connected to the tubing between the anesthesia channel 12 and the carbon dioxide absorption canister. Specifically, the patient inhales anesthetic gas from the pleated bag 4 through the anesthesia channel 12, thereby reducing the amount of gas in the pleated bag 4. The patient's exhaled gas first enters the carbon dioxide absorption canister, which absorbs the carbon dioxide in the exhaled gas and then inputs it into the anesthesia channel 12. At the same time, the gas replenishment port can input oxygen and anesthetic gas into the anesthesia channel 12. The gas in the anesthesia channel 12 is then input into the gas storage space 41 of the pleated bag 4, thereby maintaining the stability of the gas in the pleated bag 4.

[0050] The above are merely embodiments of the anesthesia circuit depressurization device of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An anesthetic circuit pressure relief device, comprising: The base, the overflow valve, the bottom cover, the folding capsule with the gas storage space, and the bellows with the internal space are provided. The driving channel, the anesthesia channel, the first gas passage hole, and the groove communicating with the anesthesia channel are provided on the base, and the gas outlet connector is provided in the groove. When the overflow valve blocks the first inner hole, the anesthesia gas in the anesthesia channel is input into the gas storage space through the anesthesia gas hole, and the gas in the gas storage space is pressed into the anesthesia channel under the pressure of the driving gas in the internal space. The driving gas in the driving channel is partly input into the internal space through the driving gas hole, and the other part is input into the first inner hole. When the overflow valve opens the first inner hole, the gas in the anesthesia channel is input into the driving channel through the groove and the first inner hole. The anesthesia gas exhaled by the patient is input into the groove through the anesthesia channel, and the anesthesia gas in the groove is input into the anesthesia channel through the first gas passage hole, output from the anesthesia channel, and depressurized.

2. The anesthetic circuit pressure relief device of claim 1, wherein, The base is provided with a protruding arm, and the protruding arm is provided with a plug-in slot.

3. The anesthetic circuit pressure relief device of claim 1, wherein, The base includes a top plate, a partition plate, and a bottom plate, the partition plate is sealingly installed between the top plate and the bottom plate, the first gas passage hole and the groove are provided on the top plate. The driving channel comprises a first channel groove arranged on the bottom plate, a first air hole arranged on the partition plate, and a second channel groove arranged on the top plate, the first channel groove being communicated with the second channel groove through the first air hole; the first air hole and the first inner hole are both communicated with the second channel groove; The anesthesia channel comprises a third channel groove and a fourth channel groove arranged on the top plate, a second air hole and a third air hole arranged on the partition plate, and a fifth channel groove arranged on the bottom plate; the third channel groove is communicated with the fourth channel groove in sequence through the second air hole, the fifth channel groove and the third air hole, and the fourth channel groove is communicated with the recess and the anesthesia air hole.

4. The anesthetic circuit pressure relief device of claim 1, wherein, The overflow valve comprises a diaphragm arranged in the recess and a counterweight arranged on the diaphragm and located in the first space, the diaphragm being used for blocking or opening the first inner hole.

5. The anesthetic circuit pressure relief device of claim 1, wherein, The bellows is made of transparent material, and a scale line for identifying the compression amount of the folding bag is arranged on the bellows.

6. The anesthetic circuit pressure relief device of claim 1, wherein, The base is provided with an annular protrusion, and the anesthesia circuit pressure relief device further comprises a sealing sleeve sleeved on the annular protrusion; the sealing sleeve is provided with an annular insertion slot, the bottom cover is provided with an annular insertion part, the bottom cover is installed on the base by inserting the annular insertion part into the annular insertion slot, and the sealing sleeve abuts against the inner wall of the internal space.

7. The anesthetic circuit pressure relief device of claim 1, wherein, The bottom cover is provided with a protruding insertion part at the end away from the base, and the folding bag is installed on the bottom cover by inserting the protruding insertion part into the gas storage space.

8. An anaesthesia machine characterised in that, The anesthesia circuit pressure relief device comprises the anesthesia circuit pressure relief device according to any one of claims 1 to 7.

9. An anaesthesia machine according to claim 8, characterised in that, The anesthesia machine further comprises a carbon dioxide absorption tank and a gas supplement interface, the anesthesia channel is communicated with the breathing end of a patient through the carbon dioxide absorption tank, and the gas supplement interface is communicated with the pipeline between the anesthesia channel and the carbon dioxide absorption tank.

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