Waste anesthetic gas extraction device for anesthesia equipment

Abstract

The invention relates to the technical field of medical instruments, and discloses an anesthetic waste gas extraction device for anesthetic equipment, which comprises an anesthetic respirator, the bottom of the anesthetic respirator is fixedly connected with an air extraction rack, the left and right sides of the rear end of the air extraction rack are symmetrically provided with air extraction bins, and the bottom of the air extraction rack is fixedly connected with a waste gas treatment box; the left end and the right end of the connecting pipe penetrate into the corresponding air exhaust bins and are fixedly connected with the air exhaust rack, first one-way valves are symmetrically arranged in the connecting pipe, and an air receiving pipe is fixedly arranged in the middle of the front end of the connecting pipe and used for being connected with an external anaesthetic mask; and the air exhaust mechanism is mounted in the air exhaust bin, and the air exhaust mechanism continuously performs air exhaust operation. Dissolved low-concentration tail gas is subjected to secondary adsorption through the activated carbon filter plate capable of being rapidly replaced, an observation window, a liquid inlet valve, a liquid outlet valve and a rotary knob type limiting stopper are arranged, and solvent replacement and filter element disassembly and assembly can be completed within a short time.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to an anesthetic waste gas extraction device for anesthesia equipment. Background Technology

[0002] Anesthesiology has evolved into an interdisciplinary field encompassing perioperative life support, pain management, and critical care. Its scope has expanded from simple surgical analgesia to include painless childbirth, painless abortion, emergency resuscitation, and postoperative monitoring. Anesthesiologists must ensure patient safety and pain relief while performing multiple tasks, including pre-anesthesia assessment, anesthesia administration, post-anesthesia resuscitation, and pain management. During these procedures, anesthetic waste gases continuously diffuse into the operating room, delivery room, and recovery room. If not promptly removed, this not only pollutes the indoor environment but also exposes healthcare workers to trace amounts of volatile anesthetics and nitrous oxide over extended periods, posing potential neurotoxicity, reproductive toxicity, and occupational health risks.

[0003] Patent CN222130727U discloses an anesthetic waste gas extraction device. The technology includes an extraction pipe with an extraction assembly at one end for extracting anesthetic waste gas, and a support rod vertically positioned below the other end of the pipe. A clamping assembly for clamping the support rod to a hospital bed is located at the bottom of the support rod, and a support plate is located at the top of the support rod. A locking assembly for locking the other end of the extraction pipe to the support plate is also located on the support plate. This invention, by setting up a clamping assembly, a support rod on the clamping assembly, and a support plate on the support rod, locks the extraction pipe to the support plate, and then clamps the clamping assembly to the hospital bed, thus supporting the extraction pipe on the bed and avoiding the increased burden on medical staff who would otherwise have to hold the extraction pipe manually. Therefore, this invention reduces the burden on medical personnel.

[0004] Although the above-mentioned equipment can extract anesthetic waste gas in a quantitative manner, the effective components in the waste gas exhaled by the patient are affected by the anesthetic dosage and the patient's breathing, making it difficult to guarantee that all the effective components in the quantitative gas can be absorbed. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides an anesthetic waste gas extraction device for anesthesia equipment to solve the problems mentioned in the background art.

[0006] This invention provides an anesthetic waste gas extraction device for anesthesia equipment, comprising an anesthesia ventilator, a suction frame fixedly connected to the bottom of the anesthesia ventilator, suction chambers symmetrically arranged on the left and right sides of the rear end of the suction frame, and a waste gas treatment box fixedly connected to the bottom of the suction frame; further comprising: A connecting pipe, with its left and right ends respectively penetrating into the corresponding suction chamber and fixedly connected to the suction machine frame, has a first one-way valve symmetrically arranged inside the connecting pipe, and an air inlet pipe fixedly provided at the middle of its front end for connecting to an external anesthesia mask. An air extraction mechanism is installed inside an air extraction chamber and continuously performs air extraction operations. A partition is fixedly connected inside the waste gas treatment box. A solvent is provided in the space in front of the partition to dissolve toxic components in the waste gas. The duct is provided in pairs and is fixedly connected to the inside of the exhaust gas treatment box on the front side of the partition. The upper end of the duct extends into the exhaust chamber and is fixedly connected to the exhaust frame.

[0007] Preferably, the suction mechanism includes a bracket, a pair of which are fixedly connected inside the suction chamber. Guide rods are slidably connected to the left and right ends of the bracket. A piston is fixedly connected to the front end of the guide rod, and the piston is located inside the suction chamber and slidably connected thereto. A lifting block is fixedly connected to the rear end of the guide rod. A mounting frame is fixedly connected inside the suction chamber located behind the bracket. A reciprocating screw is rotatably connected between the mounting frame and the bracket. A through hole adapted to the reciprocating screw is opened on the lifting block, and a pin is fixedly connected in the through hole. The head of the pin is slidably connected in the reciprocating thread groove on the reciprocating screw.

[0008] Preferably, the rear end sidewalls of the two reciprocating lead screws are connected by a sprocket assembly, and a motor is fixedly connected inside the air extraction chamber by a fixing frame, with the output shaft end of the motor fixedly connected to the rear end of the reciprocating lead screw.

[0009] Preferably, a resistance heating ring is fixedly connected to the inner wall of the air extraction frame, and the resistance heating ring is used to heat the inside of the air extraction chamber.

[0010] Preferably, a second one-way valve is fixedly connected inside the conduit, an exhaust pipe is fixedly connected to the upper rear end of the partition, and a third one-way valve is fixedly connected inside the exhaust pipe.

[0011] Preferably, the exhaust gas treatment box has an observation window on its front end face, an inlet pipe is fixedly connected to the upper left side of the exhaust gas treatment box, an outlet pipe is fixed to the lower left side of the exhaust gas treatment box, valves are provided inside the inlet pipe and the outlet pipe, and a door frame is rotatably connected inside the exhaust gas treatment box.

[0012] Preferably, a limit frame is fixedly connected to the front end of the door frame, and an activated carbon filter plate is slidably connected between the limit frame and the door frame. The activated carbon filter plate is used to filter the dissolved waste gas. A handle is fixedly connected to the front end of the right side of the door frame, and baffles are abutted against the front ends of both the left and right sides of the door frame. The side walls of the baffles are fixedly connected to the inner wall of the waste gas treatment box, and a limiter is installed in the waste gas treatment box.

[0013] Preferably, the limiter includes a mounting box, which is fixedly connected to the left end of the exhaust gas treatment box. A threaded rod is rotatably connected inside the mounting box, and a knob is fixedly connected to the left end of the threaded rod. A limit block is slidably connected inside the mounting box. A threaded hole is opened on the left end face of the limit block. The right end of the threaded rod passes through the threaded hole and is threadedly connected to it. The right end of the limit block passes through the exhaust gas treatment box. The front end of the limit block abuts against the rear end of the door frame.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention achieves continuous, stable, and high-flow-rate air extraction through a dual-extraction chamber combined with a reciprocating screw piston mechanism, which can remove residual anesthetic drugs exhaled by the patient and prevent waste gas from spreading in the operating room; at the same time, the piston movement speed is adjustable, which can change the air extraction volume in real time according to different anesthesia depths and respiratory rates, solving the defect that "quantitative air extraction cannot match the actual drug dosage", and ensuring that harmful gases are removed in a timely and thorough manner.

[0015] 2. This invention incorporates a two-stage one-way valve and a resistance heating ring between the extraction chamber and the waste gas treatment box: the resistance heating ring maintains the extraction chamber at 40–45°C to prevent the condensation and residue of anesthetic vapors such as isoflurane and sevoflurane; the two-stage one-way valve ensures that the airflow passes sequentially through the extraction chamber, the conduit, and the solvent in one direction, preventing solvent backflow or waste gas recirculation, thus protecting the anesthesia machine circuit and ensuring that toxic components are continuously and efficiently dissolved in the solvent.

[0016] 3. This invention allows for secondary adsorption of the dissolved low-concentration exhaust gas through a quickly replaceable activated carbon filter plate, and is equipped with an observation window, liquid inlet and outlet valves, and a rotary limiter, enabling solvent replacement and filter element disassembly and assembly to be completed in a short time. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall main structure of the present invention; Figure 2 This is a rear view schematic diagram of the exhaust fan frame and exhaust gas treatment box of the present invention; Figure 3 This is a top view cross-sectional structural diagram of the air extraction frame of the present invention; Figure 4 This is a schematic diagram of the main cross-sectional structure of the exhaust frame and exhaust gas treatment box of the present invention; Figure 5This is a top view cross-sectional structural diagram of the waste gas treatment box of the present invention; Figure 6 This is a schematic diagram of the exploded structure of the door frame and activated carbon filter plate of the present invention; Figure 7 This is a schematic diagram of the front cross-sectional structure of the limiter of the present invention; Figure 8 For the present invention Figure 7 Enlarged structural diagram of section A.

[0018] Numbering on the map: 1. Anesthesia ventilator; 2. Vacuum pump frame; 21. Vacuum chamber; 22. Vacuum mechanism; 221. Support; 222. Guide rod; 223. Piston; 224. Lifting block; 225. Reciprocating screw; 226. Mounting bracket; 227. Sprocket assembly; 228. Motor; 23. Resistance heating ring; 24. Connecting pipe; 241. First one-way valve; 25. Gas inlet pipe; 3. Waste gas treatment box; 31 31. Observation window; 32. Inlet pipe; 33. Outlet pipe; 34. Guide tube; 341. Second check valve; 35. Partition; 351. Exhaust pipe; 352. Third check valve; 36. Door frame; 361. Limit bracket; 362. Handle; 363. Activated carbon filter plate; 37. Limiter; 371. Mounting box; 372. Threaded rod; 373. Limit block; 374. Knob; 38. Baffle. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] like Figure 1-8 As shown, the present invention has the following three specific embodiments. Example

[0021] An anesthetic waste gas extraction device for anesthesia equipment includes an anesthesia ventilator 1, a gas extraction frame 2 fixedly connected to the bottom of the anesthesia ventilator 1, gas extraction chambers 21 symmetrically arranged on the left and right sides of the rear end of the gas extraction frame 2, and a waste gas treatment box 3 fixedly connected to the bottom of the gas extraction frame 2; it also includes: The connecting pipe 24 has its left and right ends passing through the corresponding suction chamber 21 and being fixedly connected to the suction frame 2. A first one-way valve 241 is symmetrically arranged inside the connecting pipe 24, and an air inlet pipe 25 is fixedly arranged in the middle of its front end for connecting to an external anesthesia mask. The air extraction mechanism 22 is installed inside the air extraction chamber 21 and continuously performs air extraction operation. The partition 35 is fixedly connected inside the waste gas treatment box 3. The space in front of the partition 35 is provided with solvent to dissolve the toxic components in the waste gas. The duct 34 is provided in pairs and is fixedly connected to the inside of the exhaust gas treatment box 3 on the front side of the partition 35. The upper end of the duct 34 extends into the inside of the extraction chamber 21 and is fixedly connected to the extraction frame 2. A second one-way valve 341 is fixedly connected inside the conduit 34, and an exhaust pipe 351 is fixedly connected to the upper rear end of the partition 35. A third one-way valve 352 is fixedly connected inside the exhaust pipe 351.

[0022] In this embodiment, as Figures 1-4 As shown, driven by the suction mechanism 22 of the suction chamber 21, a continuous negative pressure is formed at the mask end. The patient's exhaled drug-laden waste gas is sucked into the connecting pipe 24 through the air inlet pipe 25. The first one-way valve 241 prevents gas backflow. Subsequently, when the waste gas enters the left suction chamber 21, the waste gas from the side chamber passes through the second one-way valve 341 and is forced into the front chamber of the waste gas treatment box 3. When the waste gas enters the right suction chamber 21, the waste gas from the left suction chamber 21 passes through the second one-way valve 341 and is forced into the front chamber of the waste gas treatment box 3. The front chamber contains an alkaline solvent, which can quickly dissolve isoflurane, sevoflurane and other halogenated ethers and nitrous oxide. The dissolved clean gas is then discharged through the exhaust pipe 351 above the partition 35. The third one-way valve 352 prevents backflow of outside air, thus completing the closed-loop purification process of "suction-dissolution-emission". The concentration of anesthetic drugs in the operating room is always maintained below the safety limit. Example

[0023] The difference from Embodiment 1 is that this embodiment discloses the specific structure of the air extraction mechanism 22; The air extraction mechanism 22 includes a bracket 221. A pair of brackets 221 are provided and are fixedly connected inside the air extraction chamber 21. Guide rods 222 are slidably connected inside both the left and right ends of the bracket 221. A piston 223 is fixedly connected to the front end of the guide rod 222. The piston 223 is located inside the air extraction chamber 21 and is slidably connected thereto. A lifting block 224 is fixedly connected to the rear end of the guide rod 222. A mounting bracket 226 is fixedly connected inside the air extraction chamber 21 located behind the bracket 221. A reciprocating screw 225 is rotatably connected between the mounting bracket 226 and the bracket 221. A through hole adapted to the reciprocating screw 225 is opened on the lifting block 224. A pin is fixedly connected in the through hole. The head of the pin is slidably connected in the reciprocating thread groove on the reciprocating screw 225. The rear sidewalls of the two reciprocating lead screws 225 are connected by a sprocket assembly 227. Inside the air extraction chamber 21, a motor 228 is fixedly connected by a fixing frame. The output shaft of the motor 228 is fixedly connected to the rear end of the reciprocating lead screw 225. A resistance heating ring 23 is fixedly connected to the inner wall of the air extraction frame 2. The resistance heating ring 23 is used to heat the inside of the air extraction chamber 21.

[0024] In this embodiment, as Figure 3 As shown, when the motor 228 is energized and rotates, the sprocket assembly 227 synchronously drives the two reciprocating lead screws 225 to rotate in the same direction. The rotation of the lead screws causes the pin to slide up and down along the reciprocating thread groove, and the lifting block 224 drives the guide rod 222 and the piston 223 to make vertical reciprocating motion in the suction chamber 21. When the piston 223 moves backward, the volume of the suction chamber 21 increases and the air pressure decreases, and the exhaust gas at the mask end is quickly sucked in. When the piston 223 moves forward, the volume decreases and the air pressure increases. Since the left and right pistons 223 always move in opposite directions: when the left piston 223 moves forward, the exhaust gas in the left suction chamber 21 is forced open by the second one-way valve 341 in the left guide tube 34 and rushes into the front chamber of the exhaust gas treatment box 3. At the same time, the right piston 223 is moving backward, and the right suction chamber 21 only sucks in exhaust gas and does not discharge it. After half a cycle, the right piston 223 moves forward, and the waste gas in the right suction chamber 21 is forced open by the second one-way valve 341 in the right conduit 34, and is injected into the front chamber as well; at this time, the left piston 223 has moved backward, only drawing in new waste gas. This alternating "one-inhale-one-exhale" mode, with each side serving as a backup, ensures a continuous and stable negative pressure at the mask end, avoiding airflow interruption and enhancing bubbling turbulence to improve dissolution efficiency. The resistance heating ring 23 continuously heats the chamber wall during the reciprocating motion of the piston 223, keeping the anesthetic vapor in a vaporized state and preventing condensation and adhesion to the piston 223 or valve wall, thereby ensuring constant suction efficiency and sufficient solvent absorption. The entire system achieves long-term continuous, stable, and blockage-free operation. Example

[0025] The difference from Embodiment 2 is that this embodiment discloses the specific mechanism of the limiter 37; An observation window 31 is provided on the front end of the exhaust gas treatment box 3. An inlet pipe 32 is fixedly connected to the upper left side of the exhaust gas treatment box 3. An outlet pipe 33 is fixed to the lower left side of the exhaust gas treatment box 3. Valves are provided inside the inlet pipe 32 and the outlet pipe 33. A door frame 36 is also rotatably connected inside the exhaust gas treatment box 3. A limit frame 361 is fixedly connected to the front end of the door frame 36. An activated carbon filter plate 363 is slidably connected between the limit frame 361 and the door frame 36. The activated carbon filter plate 363 is used to filter the dissolved waste gas. A handle 362 is fixedly connected to the front end of the right side of the door frame 36. Baffles 38 are abutted against the front ends of both the left and right sides of the door frame 36. The side walls of the baffles 38 are fixedly connected to the inner wall of the waste gas treatment box 3. A limiter 37 is installed in the waste gas treatment box 3. The limiter 37 includes a mounting box 371, which is fixedly connected to the left end of the exhaust gas treatment box 3. A threaded rod 372 is rotatably connected inside the mounting box 371. A knob 374 is fixedly connected to the left end of the threaded rod 372. A limit block 373 is slidably connected inside the mounting box 371. A threaded hole is opened on the left end face of the limit block 373. The right end of the threaded rod 372 passes through the threaded hole and is threadedly connected to it. The right end of the limit block 373 passes through the interior of the exhaust gas treatment box 3. The front end of the limit block 373 abuts against the rear end of the door frame 36.

[0026] In this embodiment, as Figure 1 , Figures 4-8 As shown, when the activated carbon filter plate 363 needs to be replaced, first turn the knob 374 counterclockwise. The threaded rod 372 rotates synchronously and drives the limiting block 373 to slide to the left along the inner cavity of the mounting box 371. When the right end of the limiting block 373 is completely out of the exhaust gas treatment box 3, the door frame 36 loses its rearward constraint. Hold the handle 362 and pull the door frame 36 outward. The limiting frame 361 will then bring out the old filter plate, allowing the old activated carbon filter plate 363 to be pulled out. Then, push the new activated carbon filter plate 363 into the sliding groove of the limiting frame 361. Close the door frame 36 again until its front end is in contact with the baffle 38. Then turn the knob 374 clockwise. The limiting block 373 moves to the right and presses against the rear end of the door frame 36, forming a seal. During this process, the solvent color change can be observed in real time through the observation window 31. The liquid inlet pipe 32 and the liquid outlet pipe 33 valves can be used to replenish and drain the liquid without stopping the machine, ensuring that the dual purification of dissolution and adsorption is always in a highly efficient state.

[0027] The working principle of this invention is as follows: After being powered on, the motor 228 synchronously drives the two reciprocating lead screws 225 to rotate continuously via the sprocket assembly 227. The pins on the lead screws are constrained by the reciprocating thread grooves, forcing the lifting block 224, guide rod 222, and piston 223 to make periodic back-and-forth linear movements within the suction chamber 21. During the backward movement of the piston 223, the volume of the suction chamber 21 rapidly expands, and the internal air pressure is lower than that at the mask end. The patient's exhaled anesthetic waste gas is immediately drawn into the connecting tube 24. The first one-way valve 241 prevents the waste gas from flowing back, ensuring that the airflow enters the suction chamber 21 in one direction. During the forward movement of the piston 223, the volume of the suction chamber 21 shrinks, and the internal air pressure increases. Since the left and right pistons 223 always move in opposite directions: when the left piston 223 moves forward, the waste gas in the left suction chamber 21 is forced open by the second one-way valve 341 in the left conduit 34 and rushes into the front chamber of the waste gas treatment box 3; at the same time, the right piston 223 is moving backward, and the right suction chamber 21 only draws in waste gas without emitting it. After half a cycle, the right piston 223 moves forward, and the exhaust gas in the right suction chamber 21 is forced open by the second one-way valve 341 in the right conduit 34, and is injected into the front chamber as well; at this time, the left piston 223 has moved backward and only draws in new exhaust gas. This alternating left and right "one suction and one exhaust" mode, which serves as a backup for each other, keeps the negative pressure at the mask end continuous and stable, which not only avoids airflow interruption but also enhances bubbling disturbance and improves dissolution efficiency; the resistance heating ring 23 maintains the chamber wall at 40-45°C throughout the process to prevent the condensation and residue of vapors such as isoflurane and heptafluoroane, and maintain a constant suction efficiency; An alkaline solvent (NaOH or a special composite absorbent) is pre-filled into the pre-cavity. The exhaust gas comes into full contact with the solvent in a bubbling manner, and the halogenated ethers and nitrous oxide are rapidly chemically dissolved. A small amount of residual gas that is not completely absorbed passes through the solvent surface, opens the third one-way valve 352, and enters the space behind the partition 35. There, it is physically adsorbed by the activated carbon filter plate 363, achieving secondary purification. This not only prevents backflow of outside air but also reduces the concentration of anesthetic drugs to below 0.5 ppm, far below the OSHA limit of 35 ppm. When the solvent color darkens or the activated carbon becomes saturated, there is no need to stop the machine: The absorption status can be determined through the observation window 31. Turning the knob 374 releases the limit block 373, allowing the door frame 36 to be pulled out for quick replacement of the activated carbon plate. Simultaneously, the valves of the inlet pipe 32 and outlet pipe 33 are opened to complete the discharge of old liquid and the replenishment of new liquid. After relocking the door frame 36, the system continues to operate in a closed loop, achieving fully automated purification throughout the entire process of "continuous suction—efficient dissolution—deep adsorption—safe discharge."

[0028] While the disclosure is as stated above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of this disclosure, and all such changes and modifications will fall within the protection scope of this invention.

Claims

1. An anesthetic waste gas extraction device for anesthesia equipment, comprising an anesthesia ventilator (1), characterized in that, The anesthesia ventilator (1) is fixedly connected to a suction frame (2) at its bottom. Suction chambers (21) are symmetrically arranged on the left and right sides of the rear end of the suction frame (2). A waste gas treatment box (3) is fixedly connected to the bottom of the suction frame (2). The device also includes: The connecting pipe (24) has its left and right ends passing through the corresponding suction chamber (21) and fixedly connected to the suction frame (2). The connecting pipe (24) is symmetrically provided with a first one-way valve (241) inside, and a gas inlet pipe (25) is fixedly provided at the middle of its front end for connecting an external anesthesia mask. An air extraction mechanism (22) is installed inside an air extraction chamber (21) and continuously performs air extraction operations. A partition (35) is fixedly connected inside the waste gas treatment box (3). The front space of the partition (35) is provided with a solvent for dissolving toxic components in the waste gas. The conduit (34) is provided in pairs and is fixedly connected to the exhaust gas treatment box (3) in front of the partition (35). The upper end of the conduit (34) extends into the exhaust chamber (21) and is fixedly connected to the exhaust frame (2).

2. The anesthetic waste gas extraction device for anesthesia equipment according to claim 1, characterized in that, The air extraction mechanism (22) includes a bracket (221), which is provided in pairs and is fixedly connected to the air extraction chamber (21). Guide rods (222) are slidably connected to the left and right ends of the bracket (221). A piston (223) is fixedly connected to the front end of the guide rod (222). The piston (223) is located inside the air extraction chamber (21) and is slidably connected thereto. A lifting block (224) is fixedly connected to the rear end of the guide rod (222). An installation frame (226) is fixedly connected inside the air extraction chamber (21) located behind the bracket (221). A reciprocating screw (225) is rotatably connected between the installation frame (226) and the bracket (221). A through hole adapted to the reciprocating screw (225) is opened on the lifting block (224). A pin is fixedly connected in the through hole. The head of the pin is slidably connected in the reciprocating thread groove on the reciprocating screw (225).

3. The anesthetic waste gas extraction device for anesthesia equipment according to claim 2, characterized in that, The two reciprocating lead screws (225) are connected by a sprocket assembly (227) at their rear ends. A motor (228) is fixedly connected inside the air extraction chamber (21) by a fixing frame. The output shaft of the motor (228) is fixedly connected to the rear end of the reciprocating lead screw (225).

4. The anesthetic waste gas extraction device for anesthesia equipment according to claim 1, characterized in that, A resistance heating ring (23) is fixedly connected to the inner wall of the air extraction frame (2), and the resistance heating ring (23) is used to heat the inside of the air extraction chamber (21).

5. The anesthetic waste gas extraction device for anesthesia equipment according to claim 1, characterized in that, The conduit (34) is fixedly connected to a second one-way valve (341), the upper rear end of the partition (35) is fixedly connected to an exhaust pipe (351), and the exhaust pipe (351) is fixedly connected to a third one-way valve (352).

6. The anesthetic waste gas extraction device for anesthesia equipment according to claim 1, characterized in that, The exhaust gas treatment box (3) has an observation window (31) on its front end. An inlet pipe (32) is fixedly connected to the upper left side of the exhaust gas treatment box (3). An outlet pipe (33) is fixed to the lower left side of the exhaust gas treatment box (3). Valves are provided inside the inlet pipe (32) and the outlet pipe (33). A door frame (36) is also rotatably connected inside the exhaust gas treatment box (3).

7. The anesthetic waste gas extraction device for anesthesia equipment according to claim 6, characterized in that, A limiting frame (361) is fixedly connected to the front end of the door frame (36). An activated carbon filter plate (363) is slidably connected between the limiting frame (361) and the door frame (36). The activated carbon filter plate (363) is used to filter the dissolved waste gas. A handle (362) is fixedly connected to the front end of the right side of the door frame (36). Baffles (38) are abutted against the front ends of both the left and right sides of the door frame (36). The side walls of the baffles (38) are fixedly connected to the inner wall of the waste gas treatment box (3). A limiter (37) is installed in the waste gas treatment box (3).

8. The anesthetic waste gas extraction device for anesthesia equipment according to claim 7, characterized in that, The limiter (37) includes a mounting box (371), which is fixedly connected to the left end of the exhaust gas treatment box (3). A threaded rod (372) is rotatably connected inside the mounting box (371). A knob (374) is fixedly connected to the left end of the threaded rod (372). A limit block (373) is slidably connected inside the mounting box (371). A threaded hole is opened on the left end face of the limit block (373). The right end of the threaded rod (372) passes through the threaded hole and is threadedly connected to it. The right end of the limit block (373) passes through the exhaust gas treatment box (3). The front end of the limit block (373) abuts against the rear end of the door frame (36).

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