Disposable breathing gas filter and anesthesia breathing system

Abstract

The utility model relates to the technical field of anesthetic breathing gas filtering and anesthetic waste gas absorbing equipment, and provides a disposable breathing gas filter and an anesthetic breathing system, which comprise filtering structures respectively arranged in a gas inlet pipe, a first inner cavity and a second inner cavity; the filtering structure comprises a first filter, and the first filter is detachably installed on the air inlet pipe. The shell is provided with a first inner cavity and a second inner cavity, the first inner cavity and the second inner cavity are used for containing a carbon dioxide absorbent respectively, and the first inner cavity and the second inner cavity are separated; the air inlet pipe is communicated with the first inner cavity; the air outlet pipe is communicated with the second inner cavity; the flow guide structures are respectively arranged in the first inner cavity and the second inner cavity and are used for prolonging an airflow circulation path; according to the scheme, bacteria in gas can be thoroughly removed, carbon dioxide, dust impurities and water in the gas can be removed at the same time, it is guaranteed that the gas inhaled by a patient is clean and safe, and rehabilitation of the patient is better facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to anaesthetic breathing gas filter and anaesthetic waste gas absorption equipment technical field, especially one -off breathing gas filter and anaesthetic breathing system. BACKGROUND

[0002] Traditional anaesthetic system filter usually is through two chambers and the setting of inlet pipe and outlet pipe complete the absorption of anaesthetic waste gas such as carbon dioxide and the transmission of anaesthetic gas, and in the traditional scheme, two chambers are often hollowed out and filled with carbon dioxide absorbent (lime), gas is transmitted vertically downward and upward, and after the absorption of carbon dioxide absorbent, the patient inhales. Such scheme makes the traditional scheme unable to completely absorb carbon dioxide in anaesthetic gas, and importantly, a large amount of bacteria is carried in the gas, and the bacteria and moisture in the gas are transmitted with the airflow, which is extremely detrimental to the patient's breathing and recovery. SUMMARY

[0003] The utility model discloses an anaesthetic breathing system with the one -off breathing gas filter, which can realize the complete absorption of carbon dioxide in anaesthetic gas, and can effectively prevent the transmission of bacteria and moisture in the gas, thereby improving the patient's breathing and recovery.

[0004] To achieve the above object, the utility model provides a one -off breathing gas filter, which comprises:

[0005] A shell has a first inner cavity for containing carbon dioxide absorbent and a second inner cavity separated from the first inner cavity;

[0006] An inlet pipe is communicated with the first inner cavity;

[0007] An outlet pipe is communicated with the second inner cavity;

[0008] A filter structure is arranged in the inlet pipe, the first inner cavity and the second inner cavity respectively;

[0009] The filter structure comprises a first filter, which is detachably mounted on the inlet pipe;

[0010] A flow guide structure is arranged in the first inner cavity and the second inner cavity respectively, and is used for prolonging the airflow circulation path.

[0011] According to one aspect of the utility model, the shell is internally provided with a partition plate arranged along the vertical direction, which separates the inner cavity of the shell into the first inner cavity and the second inner cavity. The end opening of the partition plate close to the inner bottom of the shell allows the first inner cavity and the second inner cavity to communicate.

[0012] According to one aspect of the utility model, the filter structure comprises a second filter and a third filter;

[0013] The second filter is arranged at a position where the air inlet pipe communicates with the first inner cavity.

[0014] The third filter is arranged at a position where the air outlet pipe communicates with the second inner cavity.

[0015] According to an aspect of the present application, the filter structure comprises a fourth filter.

[0016] The fourth filter is horizontally arranged at the bottom of the first inner cavity and the second inner cavity and above the opening.

[0017] According to an aspect of the present application, the flow guide structure comprises a plurality of first flow guide plates arranged in the first inner cavity.

[0018] Each of the first flow guide plates is arranged on the inner wall of the shell and the partition plate along a vertical direction, and the first flow guide plates are arranged at intervals.

[0019] The free end of each of the first flow guide plates is arranged downwardly inclined.

[0020] According to an aspect of the present application, the projection of the first flow guide plate close to the top of the inner side of the shell covers the second filter.

[0021] According to an aspect of the present application, the flow guide structure comprises a plurality of second flow guide plates arranged in the second inner cavity.

[0022] Each of the second flow guide plates is arranged on the inner wall of the shell and the partition plate along a vertical direction, and the second flow guide plates are arranged at intervals.

[0023] The free end of each of the second flow guide plates is arranged upwardly inclined.

[0024] According to an aspect of the present application, the projection of the second flow guide plate close to the top of the inner side of the shell is located beside the third filter.

[0025] According to an aspect of the present application, further comprising a water absorption structure arranged at the bottom of the first inner cavity.

[0026] According to an aspect of the present application, further comprising an anesthetic gas adsorption structure arranged at the bottom of the second inner cavity in a manner that can be extended into and out of the second inner cavity.

[0027] To achieve the above object, the present application further provides an anesthetic breathing system comprising the disposable breathing gas filter, and further comprising an anesthetic machine, a first breathing pipeline, a second breathing pipeline, a breathing mask and a telescopic extension pipe.

[0028] The anesthesia machine is provided with an exhalation end interface and an inhalation end interface;

[0029] The disposable breathing gas filter is connected to the inhalation end interface, and the telescopic extension tube is connected to the exhalation end interface;

[0030] One end of the first breathing pipeline is connected to the telescopic extension tube;

[0031] One end of the second breathing pipeline is connected to the disposable breathing gas filter;

[0032] The other end of the first breathing pipeline and the other end of the second breathing pipeline are connected after being communicated to the breathing mask.

[0033] According to one scheme of the present application, a disposable breathing gas filter comprises: a shell having a first inner cavity for containing a carbon dioxide absorbent and a second inner cavity separated from the first inner cavity; an air inlet pipe communicated with the first inner cavity; an air outlet pipe communicated with the second inner cavity; a filter structure arranged in the air inlet pipe, the first inner cavity and the second inner cavity respectively; and a flow guide structure arranged in the first inner cavity and the second inner cavity respectively for prolonging the flow path of the gas. In this way, the gas passing through the air inlet pipe, the first inner cavity and the second inner cavity can be filtered multiple times by the filter structure, and the bacteria, carbon dioxide, dust impurities and moisture in the gas can be effectively removed through multiple combined filtering of different functions, so that the gas is pure and safe when inhaled by the human body through the air outlet pipe. Furthermore, the flow guide structure can effectively increase the running path of the gas in the first inner cavity and the second inner cavity, so that the gas can fully contact and react with the carbon dioxide absorbent filled in the first inner cavity and the second inner cavity, and the carbon dioxide can be more fully absorbed, ensuring that the carbon dioxide is fully removed and then discharged through the air outlet pipe.

[0034] According to one scheme of the present application, the filter structure comprises a first filter which is detachably mounted on the air inlet pipe. The first filter can be a bacteria filter, so that the bacteria can be blocked outside the cavity of the shell at the first time and cannot enter the first cavity and the second cavity, thereby ensuring that the first cavity and the second cavity are not eroded and contaminated by the bacteria and always maintain a sterile environment.

[0035] According to one scheme of the utility model, the filter structure includes a second filter and a third filter; the second filter and the third filter can be sponge structures; the second filter is arranged at a communication position of the air inlet pipe and the first inner cavity; and the third filter is arranged at a communication position of the air outlet pipe and the second inner cavity. In this way, the sterile gas can be further filtered of dust impurities and moisture when entering and exiting the cavity, thereby ensuring the cleanliness of the gas. In this way, the cleanliness of the gas entering the second inner cavity can be further ensured. The filter structure includes a fourth filter; the fourth filter can be a sponge structure; the fourth filter is horizontally arranged at the bottom of the first inner cavity and the second inner cavity and above the opening. In this way, the gas can be filtered of bacteria, dust impurities and moisture by multiple filter structures, thereby ensuring the cleanliness of the gas and ensuring that, in addition to being removed of carbon dioxide, the bacteria, dust impurities and moisture in the gas are also removed.

[0036] According to one scheme of the utility model, the flow guide structure includes a plurality of first flow guide plates arranged in the first inner cavity; the first flow guide plates are respectively arranged on the inner wall of the shell and the partition plate along the vertical direction and are arranged at intervals between the first flow guide plates; that is, the first flow guide plates are arranged in a cross manner along the vertical direction; and the free ends of the first flow guide plates are arranged in a downward inclined manner. The first flow guide plates can be straight plates or arc-shaped plates or other shapes, as long as they can increase the flow distance of the gas, increase the contact area and reaction time of the gas with the carbon dioxide absorbent. In this way, the path of the gas running in the first inner cavity is increased, for example, the running path is changed from a vertical path in the conventional scheme to an S-shaped curve path, so the time for the gas to participate in the reaction is increased, and the contact area and time of the gas with the carbon dioxide absorbent are effectively increased, so that more and more carbon dioxide is absorbed during the process of the gas descending in the first inner cavity, and the pressure of the gas entering the second inner cavity to continue to remove carbon dioxide is effectively reduced.

[0037] According to one scheme of the utility model, the projection of the first flow guide plate close to the top of the inner side of the shell covers the second filter. In this way, the gas passing through the second filter will be immediately received by the upper first flow guide plate to run along the designed path to efficiently remove carbon dioxide, thereby ensuring that the gas entering the first inner cavity is controllable throughout and removes carbon dioxide according to the preset route.

[0038] According to one scheme of the utility model, the second flow guide structure includes a plurality of second flow guide plates arranged in the second inner cavity; each second flow guide plate is arranged on the inner wall and the partition plate of the shell along the vertical direction, and each second flow guide plate is arranged at intervals; that is, each second flow guide plate is arranged along the vertical direction in a cross manner; the free end of each second flow guide plate is arranged in an upward inclined manner. In this way, the running path of the gas in the second inner cavity is increased, for example, the running path is changed from the vertical path in the conventional scheme to an S-shaped curve path, so that the time length of the gas participating in the reaction is increased, and the area and time length of the contact with the carbon dioxide absorbent are also effectively increased, so that the carbon dioxide is completely absorbed during the process of the gas rising in the second inner cavity, the gas discharged through the gas outlet pipe does not contain carbon dioxide, and the use safety of the user is ensured.

[0039] According to one scheme of the utility model, the projection of the second flow guide plate close to the top of the inner side of the shell is located beside the third filter, that is, the third filter and the corresponding outlet are not covered. In this way, the second flow guide plate at the uppermost part can guide the gas to the outlet where the third filter is located, so that the gas in the second inner cavity can be smoothly discharged, and the gas will not accumulate in the dead corner part, so that the gas in the second inner cavity will not form a turbulent flow, a disturbed flow or a turbulent flow.

[0040] According to one scheme of the utility model, the disposable breathing gas filter further comprises a water absorption structure, and the water absorption structure is located at the bottom of the first inner cavity. In this way, the water absorption structure is arranged at the bottom of the first inner cavity, so that the water brought down by the downward moving gas or the water dripping due to gravity can be effectively absorbed, and the gas entering the second inner cavity is dry and clean.

[0041] According to one scheme of the utility model, the disposable breathing gas filter further comprises an anesthetic gas adsorption structure, and the anesthetic gas adsorption structure is arranged at the bottom of the second inner cavity in a manner that can be inserted into and extended out of the second inner cavity. In this way, when anesthesia is needed, the anesthetic gas adsorption structure can be loaded from the bottom of the second inner cavity, and the anesthetic gas in the breathing gas can be removed by the flow of the gas, so as to accelerate the anesthesia recovery rate and effect of the patient.

[0042] According to the scheme of the utility model, the utility model can completely absorb the carbon dioxide in the gas, and at the same time, the bacteria, dust impurities and moisture in the discharged gas are removed, so that the gas inhaled by the patient is clean and safe, and the patient's recovery is more beneficial.

[0043] According to the scheme of the utility model, the utility model independently adds a breathing extension pipe (namely a telescopic extension pipe), the length of the telescopic extension pipe can be telescopic, and the interface adopts a standard interface matched with the expiration port of the anesthesia machine. In this way, when the anesthesia machine inhales end uses the disposable breathing gas filter, the gas path length of the anesthesia machine inhales end and expiration end is consistent, so that the patient breathes evenly and smoothly, which is helpful for the recovery of the body. BRIEF DESCRIPTION OF DRAWINGS

[0044] Figure 1 A cross-sectional view of a disposable breathing gas filter according to an embodiment of the utility model is schematically represented.

[0045] Figure 2 A structural arrangement view of an anesthesia breathing system according to an embodiment of the utility model is schematically represented. DETAILED DESCRIPTION

[0046] The content of the utility model will now be discussed with reference to exemplary embodiments. It should be understood that the discussed embodiments are only for the purpose of enabling those skilled in the art to better understand and thus implement the content of the utility model, and are not intended to imply any limitation on the scope of the utility model.

[0047] As used herein, the term "comprising" and variations thereof are to be construed as meaning "including but not limited to". The term "based on" is to be construed as "based at least in part on". The terms "one embodiment" and "an embodiment" are to be construed as "at least one embodiment".

[0048] Figure 1 A cross-sectional view of a disposable breathing gas filter according to an embodiment of the utility model is schematically represented. As shown in Figure 1 in the present embodiment, the disposable breathing gas filter comprises:

[0049] a housing 1 having a first inner cavity 2 for containing a carbon dioxide absorbent and a second inner cavity 3 separated from the first inner cavity 2;

[0050] an air inlet pipe 4 in communication with the first inner cavity 2;

[0051] an air outlet pipe 5 in communication with the second inner cavity 3;

[0052] a filter structure 6 arranged in the air inlet pipe 4, the first inner cavity 2 and the second inner cavity 3 respectively;

[0053] The filter structure 6 comprises a first filter 9, which is detachably mounted on the air inlet pipe 4;

[0054] The airflow guiding structure 7 is respectively disposed in the first inner cavity 2 and the second inner cavity 3 to extend the airflow path. In this embodiment, the first filter 9 can be a bacterial filter, which can block bacteria outside the cavity of the shell 1 at the first time, preventing them from entering the first cavity 2 and the second cavity 3, ensuring that the first cavity 2 and the second cavity 3 are not eroded and contaminated by bacteria, and always maintaining a sterile environment.

[0055] As configured above, the filter structure 6 allows for multiple filtrations of the gas passing through the inlet pipe 4, the first inner cavity 2, and the second inner cavity 3. This combination of multiple filtrations with different functions effectively removes bacteria, carbon dioxide, dust, impurities, and moisture from the gas, ensuring that the gas is pure and safe when inhaled through the outlet pipe 5. Furthermore, the flow guiding structure 7 effectively increases the gas's path within the first and second inner cavities 2 and 3, allowing for sufficient contact and reaction between the gas and the carbon dioxide absorbent filled in these cavities. This results in more complete and thorough absorption of carbon dioxide, ensuring that the gas is exhaled through the outlet pipe 5 only after complete removal of carbon dioxide.

[0056] Furthermore, such as Figure 1 As shown, in this embodiment, the housing 1 has a partition 8 arranged vertically inside, dividing the inner cavity of the housing 1 into a first inner cavity 2 and a second inner cavity 3. The partition 8 has an opening at its end near the bottom of the inner side of the housing 1, allowing the first inner cavity 2 and the second inner cavity 3 to communicate. This arrangement allows gas to travel from top to bottom in the first inner cavity 2, then enter the second inner cavity 3 through the opening below the partition 8, and then travel from bottom to top in the second inner cavity 3 to exit through the gas outlet pipe 5.

[0057] Furthermore, such as Figure 1 As shown, in this embodiment, the filter structure 6 includes a second filter 10 and a third filter 11; the second filter 10 and the third filter 11 can be structures such as sponges;

[0058] The second filter 10 is located at the connection point between the air intake pipe 4 and the first inner cavity 2;

[0059] The third filter 11 is located at the connection point between the exhaust pipe 5 and the second inner cavity 3. This arrangement allows the sterile gas to be further filtered to remove dust, impurities, and moisture as it enters and exits the cavity, ensuring gas cleanliness.

[0060] Furthermore, such as Figure 1 As shown, in this embodiment, the filter structure 6 includes: a fourth filter 13; the fourth filter 13 can be a structure such as a sponge;

[0061] The fourth filter 13 is horizontally arranged at the bottom of the first inner cavity 2 and the second inner cavity 3 and above the opening. As arranged above, a multi-filter structure can be formed to filter bacteria, dust impurities and moisture in the gas, ensuring the cleanliness of the gas and ensuring that bacteria, dust impurities and moisture in the gas are also removed in addition to carbon dioxide.

[0062] Further, as shown in the embodiment, the flow guide structure 7 includes a plurality of first flow guide plates 14 arranged in the first inner cavity 2; Figure 1

[0063] Each first flow guide plate 14 is arranged on the inner wall and the partition plate 8 of the shell 1 along the vertical direction and is arranged with a spacing between each first flow guide plate 14; that is, arranged in a cross direction along the vertical direction.

[0064] The free end of each first flow guide plate 14 is arranged to be inclined downward. In the embodiment, the first flow guide plate 14 can be a straight plate or an arc-shaped plate or other shapes, as long as it can increase the flow distance of the gas, increase the contact area and reaction time of the gas with the carbon dioxide absorbent. As arranged, the running path of the gas in the first inner cavity 2 is increased, for example, the running path is changed from a vertical path in the conventional scheme to an S-shaped curve path, so the time for the gas to participate in the reaction is increased, and the contact area and time of the gas with the carbon dioxide absorbent are effectively increased, so that more and more carbon dioxide is absorbed during the process of the gas descending in the first inner cavity 2, and the pressure of the gas entering the second inner cavity 3 to continue to remove carbon dioxide is effectively reduced.

[0065] Further, as shown in the embodiment, the flow guide structure 7 includes a plurality of first flow guide plates 14 arranged in the first inner cavity 2; Figure 1 Further, as shown in the embodiment, the flow guide structure 7 includes a plurality of second flow guide plates 15 arranged in the second inner cavity 3;

[0066] Figure 1

[0067] Each second flow guide plate 15 is arranged on the inner wall and the partition plate 8 of the shell 1 along the vertical direction and is arranged with a spacing between each second flow guide plate 15; that is, arranged in a cross direction along the vertical direction.

[0068] ​​​The free ends of each second guide plate 15 are arranged at an upward inclination. This arrangement increases the path of the gas in the second inner cavity 3, for example, changing the path from a vertical path in the traditional scheme to an S-shaped curve path. Therefore, the time for the gas to participate in the reaction is increased, and the contact area and time with the carbon dioxide absorbent are also effectively increased. This ensures that the carbon dioxide is completely absorbed during the gas's ascent in the second inner cavity 3, guaranteeing that the gas exiting through the outlet pipe 5 is free of carbon dioxide and ensuring user safety.

[0069] Furthermore, such as Figure 1 As shown, in this embodiment, the projection of the second guide plate 15 near the top of the inner side of the housing 1 is located next to the third filter 11, meaning it does not obstruct or cover the third filter 11 and its corresponding outlet. This arrangement allows the gas to be guided through the uppermost second guide plate 15 to the outlet where the third filter 11 is located, ensuring that all gas is smoothly discharged from the second inner cavity 3 without accumulating in dead zones, thus preventing turbulence, disturbance, or disturbance in the gas flow within the second inner cavity 3.

[0070] Furthermore, such as Figure 1 As shown, in this embodiment, the disposable breathing gas filter further includes a water-absorbing structure 16, which is located at the bottom of the first inner cavity 2. This is because liquids are relatively heavy, and some liquid may flow down after passing through the filter. Therefore, the water-absorbing structure 16 (e.g., absorbent paper) located at the bottom of the first inner cavity 2 (i.e., the bottom wall inside the outer shell 1 within the first inner cavity 2) effectively absorbs water carried down by the downward-moving gas or water dripping due to gravity, ensuring that the gas entering the second inner cavity 3 is dry and clean.

[0071] Furthermore, such as Figure 1 As shown, in this embodiment, the disposable breathing gas filter further includes an anesthesia structure 17 (e.g., an anesthesia box containing anesthetic), which is disposed at the bottom of the second inner cavity 3 in a manner that allows it to extend into and out of the second inner cavity 3. This arrangement allows the anesthesia structure 17 to be inserted from the bottom of the second inner cavity 3 when an additional dose of anesthesia is needed. The anesthetic can then be carried by the flow of gas through the outlet tube 5 and inhaled by the patient, achieving a further anesthetic effect.

[0072] Of course, according to another embodiment of this utility model, the anesthesia structure 17 can also be fixedly installed at the bottom of the second inner cavity 3, and then a movable partition is installed in the second inner cavity 3. In this way, when anesthesia recovery is required, the partition can be removed, allowing gas to pass through the anesthetic gas adsorption structure 17 to absorb and remove the anesthetic agent in the gas. During normal anesthesia, the anesthetic gas adsorption structure 17 is blocked by the partition, and the gas enters the second inner cavity directly from the bottom.

[0073] Furthermore, such as Figure 1 As shown, in this embodiment, the disposable respiratory gas filter further includes an adapter 18, which is installed at the end of the inlet pipe 4 and connected to the anesthesia machine. This ensures that the inlet pipe 4 and the outlet pipe 5 remain horizontal after the anesthesia machine is connected to the adapter 18, thus ensuring the normal and stable use of the disposable respiratory gas filter of this invention and preventing problems such as tilting and posture changes that could lead to decreased effectiveness or unusability.

[0074] According to the above-described solution of this utility model, this utility model can completely remove carbon dioxide from the gas, while expelling bacteria, dust impurities and moisture from the gas, ensuring that the gas inhaled by the patient is clean and safe, which is more beneficial to the patient's recovery.

[0075] Furthermore, such as Figure 2 As shown, this utility model also provides an anesthesia respiratory system, including the disposable respiratory gas filter 26 mentioned above, and further including: anesthesia machine 19, first breathing tubing 20, second breathing tubing 21, breathing mask 22 and retractable extension tube 23;

[0076] The anesthesia machine 19 is equipped with an expiratory end interface 24 and an inspiratory end interface 25;

[0077] A disposable breathing gas filter 26 is connected to the inhalation port 25, and a retractable extension tube 23 is connected to the exhalation port 24.

[0078] One end of the first breathing tubing 20 is connected to the retractable extension tubing 23;

[0079] One end of the second breathing tubing 21 is connected to a disposable breathing gas filter 26;

[0080] The other end of the first breathing tubing 20 is connected to the other end of the second breathing tubing 21 and then to the breathing mask 22. This configuration adds an independent breathing extension tube (i.e., a retractable extension tube 23) at the expiratory port 24 of the anesthesia machine 19. The length of the retractable extension tube 23 is adjustable, and its interface uses a standard interface that matches the anesthesia machine's expiratory port. This configuration ensures that when a disposable breathing gas filter is used at the inspiratory end of the anesthesia machine, the airway lengths at both the inspiratory and expiratory ends are consistent. This ensures even and smooth breathing for the patient, which is beneficial for recovery.

[0081] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of this utility model.

Claims

1. A disposable respiratory gas filter, characterized in that, The application relates to a carbon dioxide absorption device, comprising: a shell (1) having a first inner cavity (2) for containing a carbon dioxide absorption agent and a second inner cavity (3) separated from the first inner cavity (2); an air inlet pipe (4) communicating with the first inner cavity (2); an air outlet pipe (5) communicating with the second inner cavity (3); a filter structure (6) arranged in the air inlet pipe (4), the first inner cavity (2) and the second inner cavity (3) respectively; the filter structure (6) comprises a first filter (9) which is detachably mounted on the air inlet pipe (4); a flow guide structure (7) arranged in the first inner cavity (2) and the second inner cavity (3) respectively for prolonging the air flow path.

2. The disposable respiratory gas filter of claim 1, wherein, The shell (1) is internally provided with a partition plate (8) arranged along a vertical direction, which separates the inner cavities of the shell (1) into the first inner cavity (2) and the second inner cavity (3), and the end of the partition plate (8) is opened close to the bottom of the inner side of the shell (1), so that the first inner cavity (2) and the second inner cavity (3) are communicated.

3. The disposable respiratory gas filter of claim 2, wherein, The filter structure (6) comprises a second filter (10) and a third filter (11); the second filter (10) is arranged at the communication position of the air inlet pipe (4) and the first inner cavity (2); the third filter (11) is arranged at the communication position of the air outlet pipe (5) and the second inner cavity (3).

4. The disposable respiratory gas filter of claim 2, wherein, The filter structure (6) comprises a fourth filter (13); the fourth filter (13) is horizontally arranged on the bottom of the first inner cavity (2) and the second inner cavity (3) and is located above the opening.

5. The disposable respiratory gas filter of claim 3, wherein, The flow guide structure (7) comprises a plurality of first flow guide plates (14) arranged in the first inner cavity (2); each first flow guide plate (14) is arranged on the inner wall of the shell (1) and the partition plate (8) along a vertical direction, and the first flow guide plates (14) are arranged at intervals; the free end of each first flow guide plate (14) is arranged in a downward inclined manner.

6. The disposable respiratory gas filter of claim 5, wherein, The projection of the first flow guide plate (14) close to the top of the inner side of the shell (1) covers the second filter (10).

7. The disposable respiratory gas filter of claim 3, wherein, The flow guide structure (7) comprises a plurality of second flow guide plates (15) arranged in the second inner cavity (3); each second flow guide plate (15) is arranged on the inner wall of the shell (1) and the partition plate (8) along a vertical direction, and the second flow guide plates (15) are arranged at intervals; the free end of each second flow guide plate (15) is arranged in an upward inclined manner.

8. The disposable respiratory gas filter of claim 7, wherein, The projection of the second flow guide plate (15) close to the top of the inner side of the shell (1) is located beside the third filter (11).

9. The single use respiratory gas filter of any one of claims 1-8, wherein, Further comprising: a water absorption structure (16) arranged at the bottom of the first inner cavity (2).

10. The single use respiratory gas filter of any one of claims 1-8, wherein, Further comprising: an anesthetic gas adsorption structure (17) arranged at the bottom of the second inner cavity (3) in a manner that can extend into and out of the second inner cavity (3).

11. An anaesthetic breathing system characterised in that, The disposable respiratory gas filter according to any one of claims 1-10, further comprising: an anesthesia machine (19), a first breathing line (20), a second breathing line (21), a breathing mask (22), and a telescopic extension tube (23); the anesthesia machine (19) is provided with an expiratory end interface (24) and an inspiratory end interface (25); the disposable respiratory gas filter is connected to the inspiratory end interface (25), and the telescopic extension tube (23) is connected to the expiratory end interface (24); one end of the first breathing line (20) is connected to the telescopic extension tube (23); one end of the second breathing line (21) is connected to the disposable respiratory gas filter; the other end of the first breathing line (20) and the other end of the second breathing line (21) are connected to the breathing mask (22) after being communicated.

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