Cleaning and disinfecting device for anesthesia equipment

By designing an automated cleaning and disinfection device for anesthesia equipment, the problems of low cleaning and disinfection efficiency and poor effect in existing technologies have been solved. This device enables efficient cleaning, disinfection and drying of oxygen masks, laryngoscope lenses and breathing circuit tubing, avoiding cross-contamination.

CN121776173APending Publication Date: 2026-04-03SECOND AFFILIATED HOSPITAL OF XIAN MEDICAL UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-03-13
Publication Date
2026-04-03

AI Technical Summary

Technical Problem

In existing technologies, the cleaning and disinfection efficiency of oxygen masks, laryngoscope lenses, and breathing circuit tubing is low. Manual disinfection is inefficient, and mechanical disinfection is ineffective. These technologies cannot effectively clean and disinfect anesthesia equipment and pose a risk of cross-contamination.

Method used

A cleaning and disinfection device for anesthesia equipment was designed, comprising a cleaning fluid circulation mechanism, a water-air pressurization tank, a cleaning-disinfection tank, and a hot air blower. Through a high-pressure nozzle, a rotation adjustment mechanism, and a clamping mechanism, it achieves automated cleaning, disinfection, and drying, preventing cross-contamination.

Benefits of technology

It enables efficient cleaning, disinfection, and drying of oxygen masks, laryngoscope lenses, and breathing circuit tubing, avoiding cross-contamination, improving cleaning efficiency and effectiveness, and reducing material waste.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention relates to the technical field of anesthesiology department auxiliary equipment, and discloses an anesthesia equipment cleaning and disinfecting device which comprises a workbench, and the workbench is provided with a cleaning liquid circulating mechanism, a water-gas pressurizing box, a cleaning-disinfecting box and an air heater; according to the device, through the arrangement of the cleaning liquid circulating mechanism, the water-gas pressurization box, the cleaning-disinfection box, the cleaning-disinfection pipeline system, the reversing supply device, the clamping mechanism and the anti-backflow spray head, anesthesia equipment such as an oxygen mask, a laryngoscope lens and a breathing loop pipeline can be efficiently cleaned, disinfected and dried during use; the device has the characteristics of high automation degree and good cleaning and drying efficiency; the problems that in the background technology, the manual disinfection efficiency is low, the cleaning and disinfection effect of a mechanical disinfection method is poor, and cleaning and disinfection of anesthesia equipment cannot be effectively completed are effectively solved.
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Description

Technical Field

[0001] This invention belongs to the field of anesthesiology auxiliary equipment technology, specifically relating to a cleaning and disinfection device for anesthesia equipment. Background Technology

[0002] Anesthesia refers to various methods used during surgery or diagnostic procedures to eliminate pain, ensure patient safety, and create favorable surgical conditions. It is also used to control pain. During surgery or diagnostic procedures, patients experience pain and require anesthetic drugs or other methods to temporarily render them unconscious, creating favorable conditions for the surgery or examination. In anesthesiology, anesthesia can be broadly classified into general anesthesia and local anesthesia based on the method of administration. General anesthesia is further divided into inhalation anesthesia, intravenous anesthesia, and combined inhalation and intravenous anesthesia. Inhalation anesthesia typically involves administering an oxygen mask to the patient to achieve an anesthetic effect, often supplemented by the use of a laryngoscope and a breathing circuit.

[0003] However, after the procedure, existing inhalation anesthesia methods present limitations in the structure and shape of the oxygen mask, laryngoscope blade, and breathing circuit tubing, making effective cleaning and disinfection of these components difficult. Using disposable equipment, on the other hand, leads to significant environmental pollution and material waste. Therefore, how to effectively clean and disinfect these components has become a pressing issue in this field. Existing methods for cleaning and disinfecting oxygen masks, laryngoscope blades, and breathing circuit tubing mainly include manual and mechanical disinfection.

[0004] Manual disinfection involves manually cleaning anesthesia equipment such as oxygen masks, laryngoscope lenses, and breathing circuit tubing in a disinfection tank. However, this method is problematic because workers' hands are immersed in the disinfection tank for extended periods, which can severely damage their skin. Furthermore, manual cleaning is slow, and during immersion, oxygen masks and breathing circuits tend to float on the surface of the disinfectant, while laryngoscope lenses sink to the bottom, resulting in incomplete cleaning of the upper surfaces of these devices. Additionally, after cleaning, water stains on the outer surfaces of these devices can only be air-dried naturally, which is slow and affects subsequent use.

[0005] Mechanical disinfection includes using an anesthesia equipment cleaning and disinfection device, such as the one disclosed in patent number CN216369206 U, to clean and disinfect anesthesia equipment such as oxygen masks, laryngoscope lenses, and breathing circuit tubing. However, because this device uses a spray head matched with a water pump to spray the medication, but the solution does not have a corresponding rotating mechanism, it can only clean and disinfect anesthesia equipment such as oxygen masks, laryngoscope lenses, and breathing circuit tubing from one direction, resulting in low cleaning efficiency. At the same time, this structure cannot effectively treat residual anesthetic drugs in the breathing circuit tubing, resulting in poor cleaning and disinfection effect of the device for anesthesia equipment, and it cannot effectively complete the cleaning and disinfection of anesthesia equipment.

[0006] Therefore, we propose a novel cleaning and disinfection device for anesthesia equipment to address the problems mentioned above. Summary of the Invention

[0007] (a) Technical problems to be solved

[0008] To address the shortcomings of existing technologies, this invention provides a cleaning and disinfection device for anesthesia equipment. This device has the advantage of automatically cleaning and disinfecting oxygen masks, laryngoscope lenses, and breathing circuit tubing, thus solving the problems of low efficiency of manual disinfection and poor cleaning and disinfection effects of mechanical disinfection methods in the prior art, which cannot effectively clean and disinfect anesthesia equipment.

[0009] (II) Technical Solution

[0010] To achieve the aforementioned goal of automating the cleaning and disinfection of oxygen masks, laryngoscope lenses, and breathing circuit tubing, this invention provides the following technical solution:

[0011] A cleaning and disinfection device for anesthesia equipment includes a workbench, on which a cleaning fluid circulation mechanism, a water-air pressurization tank, a cleaning-disinfection chamber, and a hot air blower are installed. The cleaning fluid circulation mechanism and the hot air blower are both connected to the water-air pressurization tank and the cleaning-disinfection chamber via a cleaning-disinfection pipeline system. The water-air pressurization tank is located below the cleaning-disinfection chamber and is connected to it via a pressurization pipeline. The cleaning-disinfection chamber has a sealed structure, and a high-pressure nozzle is installed on its inner wall, connected to the cleaning-disinfection pipeline system and the water-air pressurization tank. The cleaning-disinfection chamber also has a cleaning rack with a clamping mechanism inside.

[0012] As a preferred embodiment of the anesthesia equipment cleaning and disinfection device described in this invention:

[0013] The cleaning fluid circulation mechanism is located below the water-air pressurization tank and includes a first storage tank and a second storage tank. The first storage tank is connected to the water-air pressurization tank and the cleaning-disinfection tank through the cleaning-disinfection branch system of the cleaning-disinfection pipeline system. The second storage tank is connected to the water-air pressurization tank and the cleaning-disinfection tank through the waste liquid return branch system of the cleaning-disinfection pipeline system.

[0014] Based on the above technical features: by setting up the first and second liquid storage tanks and the corresponding cleaning-disinfection branch system and waste liquid return branch system, cleaning fluid or clean water can be provided as needed during use to clean and rinse anesthesia equipment such as oxygen masks, laryngoscope lenses and breathing circuit tubing, so as to remove cleaning fluid and anesthetic residues adhering to their surfaces, which can effectively ensure the cleaning effect of anesthesia equipment, and each branch is independent of each other, so that cross-contamination will not occur between branches.

[0015] As a preferred embodiment of the anesthesia equipment cleaning and disinfection device described in this invention:

[0016] The cleaning-disinfection branch system includes a first liquid supply pipe, a pressure relief return pipe, a second gas-liquid delivery pipe, a first gas-liquid delivery pipe, and a reversing feeder. One end of the first liquid supply pipe is connected to a first liquid storage tank, and the other end is connected to the liquid inlet of the reversing feeder. One end of the pressure relief return pipe is connected to the pressurization chamber in the water-gas pressurization tank, and the other end is connected to the first liquid storage tank. A first overflow valve is installed on the pressure relief return pipe. One end of both the second and first gas-liquid delivery pipes is connected to the liquid-gas outlet of the reversing feeder. The other end of the second gas-liquid delivery pipe is connected to the water-gas pressurization tank. The other end of the first gas-liquid delivery pipe is connected to a third gas-liquid delivery pipe and a guide path on the side wall of the cleaning-disinfection tank via a tee. Solenoid valves are installed on both the guide path and the third gas-liquid delivery pipe.

[0017] The waste liquid return branch system includes a first sewage pipe and a second sewage pipe that are interconnected. The other end of the first sewage pipe is connected to the pressurization chamber, and the other end of the second sewage pipe is connected to the cleaning chamber. A third solenoid valve is installed on both the first sewage pipe and the second sewage pipe.

[0018] Based on the above technical features: by setting up independent and automatically controllable cleaning-disinfection branch systems and waste liquid return branch systems, it is possible to switch and adjust the cleaning mode, rinsing mode and drying mode during the cleaning and rinsing process of anesthesia equipment such as oxygen masks, laryngoscope lenses and breathing circuit tubing as needed, effectively avoiding cross-contamination, while ensuring the efficiency and effect of cleaning, rinsing and drying.

[0019] As a preferred embodiment of the anesthesia equipment cleaning and disinfection device described in this invention:

[0020] The reversing supply device includes a supply device housing, and a piston, a first pressurizing pump, a second pressurizing pump, and a third pressurizing pump disposed within the supply device housing. The supply device housing is a four-way connecting cylinder, and a guide sleeve is provided within the supply device housing. The internal flow guiding cavity of the guide sleeve is connected to an exhaust port and a liquid outlet disposed on the side wall of the guide sleeve. The piston is movably disposed within the flow guiding cavity. The first pressurizing pump is disposed at the liquid inlet of the flow guiding cavity, the second pressurizing pump is disposed at the air inlet of the flow guiding cavity, and the third pressurizing pump is disposed within the liquid-gas outlet connected to the second gas-liquid delivery pipe.

[0021] Based on the above technical features: through the structural design of the reversing supply device, this device can achieve cross-use of water and air through a set of cleaning-disinfection pipeline system. Without affecting the cleaning and disinfection effect, it effectively saves materials and avoids structural complexity, and facilitates later maintenance and repair.

[0022] As a preferred embodiment of the anesthesia equipment cleaning and disinfection device described in this invention:

[0023] The cleaning-disinfection box is also equipped with a rotation adjustment mechanism, which includes a turntable, a motor, and a drive gear. The turntable has a disc-shaped structure, with symmetrically arranged limiting discs on it that cooperate with positioning rings located inside the cleaning-disinfection box. A groove is formed between the two limiting discs, and a roller is also provided in the groove to contact the bottom of the middle limiting groove of the positioning ring. The motor is located on the lower side of the positioning ring. The drive gear is located on the drive end of the motor and meshes with a gear ring located at the bottom of the turntable.

[0024] Based on the above technical features: through the setting of turntable, positioning ring and roller, the turntable can be driven by motor to rotate, so as to realize the dynamic cleaning and drying of anesthesia equipment such as oxygen mask, laryngoscope lens and breathing circuit tubing, ensuring the efficiency and effect of cleaning, disinfection and drying of anesthesia equipment.

[0025] As a preferred embodiment of the anesthesia equipment cleaning and disinfection device described in this invention:

[0026] The cleaning rack includes a positioning frame and a mesh sheet set on the positioning frame. The positioning frame is also provided with a retaining strip, which works in conjunction with a limiting slot set on the upper side of the turntable.

[0027] The clamping mechanism includes a connector, an adjusting pressure member, a first clamping member, and a second clamping member; the connector is detachably mounted on the column of the positioning frame; the adjusting pressure member is rotatably mounted on the connector via a torsion spring and works in conjunction with the second clamping member; the first clamping member is located at the lower end of the connector and works in conjunction with the second clamping member; the second clamping member is connected to the connector via a guide block on the connector, and a first spring is also sleeved on the guide block to work in conjunction with the second clamping member.

[0028] Based on the above technical features: the cleaning rack can hold and fix anesthesia equipment such as oxygen masks, laryngoscope blades, and breathing circuit tubing, while facilitating the cleaning and drying of the anesthesia equipment; the clamping mechanism can be used to clamp the anesthesia equipment such as oxygen masks and breathing circuit tubing during use, preventing them from floating during the cleaning process, so that the anesthesia equipment such as oxygen masks and breathing circuit tubing can always be submerged in water throughout the cleaning process, effectively ensuring the cleaning effect.

[0029] As a preferred embodiment of the anesthesia equipment cleaning and disinfection device described in this invention:

[0030] The anti-backflow nozzle includes a nozzle housing, a guide fluid, and a movable body disposed within the nozzle housing; the nozzle housing is detachably disposed within a cleaning-disinfection chamber, and a guide fluid channel is provided within the nozzle housing; the guide fluid is a fixedly disposed in an inverted trapezoidal structure on the nozzle housing, and a gas-liquid channel is provided on the guide fluid to communicate with a gas-liquid nozzle disposed on the nozzle housing; the movable body is disposed within the nozzle housing by a second spring.

[0031] The upper part of the nozzle housing has a bullet-shaped structure. An external spiral pattern is provided on the outside of the nozzle housing to cooperate with the breathing circuit pipe. The cavity at the front end of the nozzle housing is filled with a filler.

[0032] Based on the above technical features, it can effectively prevent backflow and increase water pressure during use, so that the clean water, cleaning solution or drying gas applied to anesthesia equipment such as oxygen masks, laryngoscope lenses and breathing circuit tubing are high-pressure liquids and gases, to ensure cleaning and drying efficiency; at the same time, through the upper shape and structure of the nozzle shell, it can be used in conjunction with the breathing circuit tubing to clean the inside of the breathing circuit tubing, ensuring cleaning efficiency and effect.

[0033] (III) Beneficial Effects

[0034] Compared with the prior art, the present invention provides a cleaning and disinfection device for anesthesia equipment, which has the following features:

[0035] Beneficial effects:

[0036] 1. The cleaning fluid circulation mechanism can provide cleaning fluid or water as needed during use to clean and rinse anesthesia equipment such as oxygen masks, laryngoscope lenses and breathing circuit tubing, to remove cleaning fluid and anesthetic residues adhering to their surfaces, effectively ensuring the cleaning effect of the anesthesia equipment, and each branch is independent of each other, so that cross-contamination will not occur between branches.

[0037] 2. By setting up a water-air pressurization box, water and air can be pressurized and sent into the cleaning-disinfection box to clean and dry anesthesia equipment such as oxygen masks, laryngoscope lenses and breathing circuit tubing, ensuring the efficiency and effectiveness of rinsing and drying;

[0038] 3. The cleaning-disinfection box provides a sealed space for rotating and fixing the cleaning rack, while enabling dynamic cleaning and drying of anesthesia equipment such as oxygen masks, laryngoscope lenses, and breathing circuit tubing, effectively ensuring the efficiency and effectiveness of rinsing and drying.

[0039] 4. By setting up a cleaning-disinfection pipeline system, the cleaning fluid circulation mechanism, water-air pressurization tank, cleaning-disinfection box, and hot air blower are connected to each other, which can realize automatic water delivery cleaning and drying of anesthesia equipment such as oxygen masks, laryngoscope lenses, and breathing circuit tubing;

[0040] 5. Through the structural design of the reversing supply device, this device can achieve cross-use of water and air through a single cleaning-disinfection pipeline system, effectively saving materials and avoiding structural complexity without affecting the cleaning and disinfection effect;

[0041] 6. With the clamping mechanism, the oxygen mask and breathing circuit tubing and other anesthesia equipment can be clamped during use to prevent them from floating during the cleaning process. This ensures that the oxygen mask and breathing circuit tubing and other anesthesia equipment are always submerged in water throughout the cleaning process, effectively guaranteeing the cleaning effect.

[0042] 7. By setting up anti-backflow nozzles, it can effectively prevent backflow and increase water pressure during use, so that the clean water, cleaning solution or drying gas acting on anesthesia equipment such as oxygen masks, laryngoscope lenses and breathing circuit tubing is high-pressure liquid and gas, so as to ensure cleaning and drying efficiency; it has the advantages of high automation and good cleaning and drying efficiency, effectively solving the problems of low efficiency of manual disinfection and poor cleaning and disinfection effect of mechanical disinfection methods in the background technology, which cannot effectively complete the cleaning and disinfection of anesthesia equipment. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the structure of the anesthesia equipment cleaning and disinfection device of the present invention.

[0044] Figure 2 This is a schematic diagram of the structure of the worktable of the present invention.

[0045] Figure 3 This is an installation effect diagram of the water-air pressurization box and cleaning-disinfection box of the present invention.

[0046] Figure 4 This is a cross-sectional view of the anesthesia equipment cleaning and disinfection device of the present invention.

[0047] Figure 5 This is a schematic diagram of the cleaning-disinfection pipeline system of the present invention.

[0048] Figure 6 This is a partial enlarged view of part A of the cleaning-disinfection box of the present invention.

[0049] Figure 7 This is a top view of the cleaning-disinfection box of the present invention.

[0050] Figure 8 This is a schematic diagram of the structure of the turntable of the present invention.

[0051] Figure 9 This is a schematic diagram of the reversing feeder of the present invention.

[0052] Figure 10 This is a cross-sectional view of the reversing feeder of the present invention.

[0053] Figure 11 This is a schematic diagram of the cleaning rack of the present invention.

[0054] Figure 12 This is a schematic diagram of the clamping mechanism of the present invention.

[0055] Figure 13 This is a schematic diagram of the anti-backflow nozzle of the present invention.

[0056] Figure 14 This is a cross-sectional view of the anti-backflow nozzle of the present invention.

[0057] In the diagram: 1. Workbench, 11. Base plate, 12. Column, 13. Upper plate, 14. Positioning rib; 2. First storage tank, 22. Replenishment liquid inlet, 23. Pressure relief return pipe, 231. First overflow valve, 24. First liquid supply pipe, 25. First gas-liquid supply pipe, 26. T-junction, 27. Second storage tank, 28. First solenoid valve, 29. Second solenoid valve; 3. Water-gas pressurization box, 31. Pressurization chamber, 32. Second gas-liquid supply pipe, 33. Pressurization pipeline, 34. First drain pipe, 35. Second drain pipe, 36. Third solenoid valve; 4. Cleaning-disinfection box, 41. Cleaning chamber, 42. Third gas-liquid supply pipe, 43. Turntable, 431. Limiting plate, 432. Slot, 433. Limiting groove, 44. Motor, 45. Gear ring, 46. Drive gear, 47. Roller, 4 8. Positioning ring; 5. Hot air blower; 6. Cleaning-disinfection piping system; 61. Reversing feeder; 611. Feeding chamber; 62. Guide sleeve; 621. Flow guiding chamber; 622. Exhaust port; 623. Drain outlet; 63. Piston; 64. First pressurizing pump; 65. Second pressurizing pump; 66. Third pressurizing pump; 7. Clamping mechanism; 71. Connector; 72. Adjusting pressure component; 73. First clamping component; 731. Guide block; 732. Positioning plate; 74. Second clamping component; 75. First spring; 8. Cleaning frame; 81. Positioning frame; 82. Mesh; 83. Clip; 9. Anti-backflow nozzle; 91. Nozzle housing; 911. Flow guiding channel; 912. Gas-liquid outlet; 913. Gas-liquid nozzle; 92. Flow guiding fluid; 921. Gas-liquid channel; 93. Second spring; 94. Movable body. Detailed Implementation

[0058] 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.

[0059] Please see Figures 1-14This invention provides a technical solution: a cleaning and disinfection device for anesthesia equipment, comprising a workbench 1, and a cleaning fluid circulation mechanism 2, a water-air pressurization tank 3, a cleaning-disinfection tank 4, a hot air blower 5, and a cleaning-disinfection pipeline system 6 installed on the workbench 1; wherein the cleaning fluid circulation mechanism 2 is connected to the water-air pressurization tank 3 and the cleaning-disinfection tank 4 respectively through the cleaning-disinfection pipeline system 6, and is used to provide cleaning fluid for cleaning and disinfection to the water-air pressurization tank 3 and the cleaning-disinfection tank 4 during use, and to complete the circulation of the cleaning fluid; the water-air pressurization tank 3 is located below the cleaning-disinfection tank 4 and is connected to the cleaning-disinfection tank 4, and is used to pressurize the cleaning fluid and hot air and release them into the cleaning-disinfection tank 4 to dry and disinfect anesthesia equipment such as oxygen masks, laryngoscope lenses, and breathing circuit tubing; and a high-pressure nozzle 9 is provided in the cleaning-disinfection tank 4 for spraying high-pressure cleaning fluid and hot air, and the high-pressure nozzle 9 is connected to the end pipeline of the cleaning-disinfection pipeline system 6 and the water The pressurization pipeline 33 inside the air-gas pressurization box 3 is connected to the end of the pressurization pipeline 33; the high-pressure nozzle 9 is also used in conjunction with the breathing circuit pipeline for cleaning and disinfecting the inside of the breathing circuit pipeline during use; the cleaning-disinfection box 4 is also equipped with a cleaning rack 8, which is used in conjunction with the anti-backflow nozzle 9 to dry and disinfect anesthesia equipment such as oxygen masks, laryngoscope lenses, and breathing circuit pipelines. In order to fix the lighter anesthesia equipment such as oxygen masks and breathing circuit pipelines and prevent them from floating on the surface of the cleaning liquid and not being effectively cleaned, the cleaning rack 8 is also equipped with a clamping mechanism 7, which is used in conjunction with oxygen masks and breathing circuit pipelines; the hot air blower 5 is connected to the water-gas pressurization box 3 and the cleaning-disinfection box 4 through the cleaning-disinfection pipeline system 6 respectively, and is used to provide hot air for drying and disinfection into the water-gas pressurization box 3 and the cleaning-disinfection box 4 during use, so as to dry and disinfect the water-gas pressurization box 3 and the cleaning-disinfection box 4, as well as anesthesia equipment such as oxygen masks, laryngoscope lenses, and breathing circuit pipelines.

[0060] Example 1: As Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, the cleaning fluid circulation mechanism 2 is installed between the base plate 11 and the upper plate 13 of the workbench 1, and includes a first storage tank 21 and a second storage tank 27. The first storage tank 21 is connected to the water-air pressurization tank 3 and the cleaning-disinfection tank 4 via the cleaning-disinfection branch system of the cleaning-disinfection pipeline system 6, and is used to provide cleaning fluid and clean water to the water-air pressurization tank 3 and the cleaning-disinfection tank 4 to complete the cleaning and disinfection of anesthesia equipment such as oxygen masks, laryngoscope lenses, and breathing circuit tubing; and to complete the cleaning and disinfection of the water-air pressurization tank 3, the cleaning-disinfection tank 4, the cleaning-disinfection pipeline system 6, the clamping mechanism 7, the cleaning rack 8, the high-pressure nozzle 9, the oxygen mask, laryngoscope lens, and other anesthesia equipment. The laryngoscope lens and breathing circuit tubing, among other anesthesia equipment, are rinsed with clean water to remove residual cleaning fluid and anesthetic agents adhering to their surfaces. The second storage tank 27 is connected to the water-air pressurization tank 3 and the cleaning-disinfection tank 4 via the waste liquid return branch system of the cleaning-disinfection pipeline system 6. This allows the cleaning fluid and anesthetic agents in the water-air pressurization tank 3 and the cleaning-disinfection tank 4 to flow back into the second storage tank 27 after cleaning and disinfection. This completes the cleaning and disinfection of anesthesia equipment such as oxygen masks, laryngoscope lenses, and breathing circuit tubing, as well as the recovery of residual wastewater in the water-air pressurization tank 3, the cleaning-disinfection tank 4, the cleaning-disinfection pipeline system 6, the clamping mechanism 7, the cleaning rack 8, and the high-pressure nozzle 9.

[0061] As a preferred embodiment, to facilitate the addition of clean water and cleaning fluid to the first liquid storage tank 21 during use, a replenishment port 22 is provided on the first liquid storage tank 21, and the replenishment port 22 is connected to an external water pipe through a flange.

[0062] As a preferred embodiment, in order to facilitate the discharge of wastewater from the second storage tank 27 during use, a drain outlet 28 is also provided at the bottom of the second storage tank 27; at the same time, in order to filter the residue in the cleaning waste liquid discharged from the waste liquid return branch system, a filter screen 29 is also provided on the upper side of the second storage tank 27, which is used to filter the residue in the cleaning waste liquid during use.

[0063] Example 2: Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8As shown, the water-air pressurization box 3 is fixedly installed on the upper platform 13, and a pressurization chamber 31 is provided inside the water-air pressurization box 3. The pressurization chamber 31 is connected to the first liquid storage tank 21 and the second liquid storage tank 27 through a cleaning-disinfection branch system and a waste liquid return branch system, respectively, for providing high-pressure water and high-pressure gas to the bottom of the cleaning-disinfection box 4 to clean and dry anesthesia equipment such as oxygen masks, laryngoscope lenses, and breathing circuit tubing; the cleaning-disinfection box 4 is fixedly installed on the upper side of the water-air pressurization box 3, and the internal cleaning chamber 41 of the cleaning-disinfection box 4 is connected to the pressurization chamber 31 through the bottom high-pressure nozzle 9, for cleaning and drying anesthesia equipment such as oxygen masks, laryngoscope lenses, and breathing circuit tubing during use.

[0064] As a preferred embodiment, to facilitate the rotation of the cleaning rack 8 installed inside the cleaning chamber 41 during use, enabling dynamic cleaning and drying of anesthesia equipment such as oxygen masks, laryngoscope lenses, and breathing circuit tubing, and ensuring effective cleaning and drying, a rotation adjustment mechanism is also provided inside the cleaning-disinfection chamber 4. This mechanism includes a turntable 43, a motor 44, and a drive gear 46. The turntable 43 is a disc-shaped structure rotatably installed inside the cleaning-disinfection chamber 4. Two limiting discs 431 are symmetrically arranged on the turntable 43, forming a groove 432 between them. The limiting discs 431 cooperate with a positioning ring 48 installed inside the cleaning-disinfection chamber 4, using the limiting effect of the positioning ring 48 to rotate the turntable 43 to the center of the positioning ring 48. The turntable 43 is rotatably mounted within the limiting groove. To reduce the friction between the turntable 43 and the middle limiting groove of the positioning ring 48 during rotation, a roller 47 is rotatably mounted within the slot 432, contacting the bottom of the middle limiting groove of the positioning ring 48. This converts sliding friction into rolling friction, reducing the resistance of the motor 44 during the rotation of the turntable 43. The motor 44 is fixedly mounted on the lower side of the positioning ring 48 to provide driving force to the drive gear 46. The drive gear 46 is located at the drive end of the motor 44 and meshes with the gear ring 45 located at the bottom of the turntable 43. During use, the motor 44 drives the turntable 43 to rotate, thereby enabling the cleaning rack 8 to rotate and dynamically clean and dry anesthesia equipment such as oxygen masks, laryngoscope lenses, and breathing circuit tubing.

[0065] As a preferred embodiment, to facilitate the installation of the high-pressure nozzle 9 on the side wall of the cleaning-disinfection box 4 during use, a guide passage is also provided on the side wall of the cleaning-disinfection box 4 to communicate with the mounting slot of the high-pressure nozzle 9.

[0066] Example 3: Figure 1 , Figure 3 , Figure 4 , Figure 5 , Figure 9 and Figure 10As shown, to facilitate the use of the cleaning fluid circulation mechanism 2, water-air pressurization tank 3, cleaning-disinfection tank 4, and hot air blower 5, the cleaning fluid circulation mechanism 2, water-air pressurization tank 3, cleaning-disinfection tank 4, and hot air blower 5 are connected to each other to achieve the effect of automatic water supply cleaning and drying of anesthesia equipment such as oxygen masks, laryngoscope lenses, and breathing circuit tubing. In addition to the cleaning-disinfection branch system and waste liquid return branch system as described in Embodiment 1 above, the cleaning-disinfection branch system is also equipped with a reversing supply device 61 connected to the hot air blower 5.

[0067] As a preferred embodiment, to facilitate the replenishment of cleaning fluid into the water-air pressurization tank 3 and the cleaning-disinfection tank 4, and to facilitate the drying of the water-air pressurization tank 3 and the cleaning-disinfection tank 4, the cleaning-disinfection branch system is designed to include a first liquid supply pipe 24, a pressure relief return pipe 23, a second gas-liquid supply pipe 32, and a first gas-liquid supply pipe 25. The inlet end of the first liquid supply pipe 24 is connected to the first liquid storage tank 21, and the outlet end is connected to the inlet of the reversing feeder 61, for supplying cleaning fluid and clean water to the reversing feeder 61. The inlet end of the pressure relief return pipe 23 is connected to the pressurization chamber 31, and the outlet end is connected to the first liquid storage tank 21. A first overflow valve 231 is installed on the pressure relief return pipe 23 to release excess water when the water pressure in the pressurization chamber 31 exceeds the set threshold of the first overflow valve 231. 3. The water in the pressurization chamber 31 is drained into the first storage tank 21 to reduce the water pressure in the pressurization chamber 31 and protect the water-gas pressurization box 3. The air-liquid inlet of the second gas-liquid delivery pipe 32 and the air-liquid delivery pipe 25 are both connected to the liquid-gas outlet of the reversing feeder 61, and the air-liquid outlet of the second gas-liquid delivery pipe 32 is connected to the water-gas pressurization box 3 for supplying cleaning liquid and drying gas to the pressurization chamber 31. The air-liquid outlet of the first gas-liquid delivery pipe 25 is connected to the third gas-liquid delivery pipe 42 and the guide passage on the side wall of the cleaning-disinfection box 4 through the tee 26. A first solenoid valve 28 is installed on the external pipe of the guide passage, and a second solenoid valve 29 is installed on the third gas-liquid delivery pipe 42. During use, the water supply and gas supply mode are controlled by controlling the opening and closing of the first solenoid valve 28 and the second solenoid valve 29.

[0068] As a preferred embodiment, to facilitate pressure control within the first liquid supply pipe 24, the first gas-liquid supply pipe 25, and the second gas-liquid supply pipe 32 during use, as well as switching between liquid and gas supply processes, the reversing feeder 61 is designed to include a feeder housing, and a piston 63, a first pressurizing pump 64, a second pressurizing pump 65, and a third pressurizing pump 66 disposed within the feeder housing; wherein the feeder housing is a four-way connecting cylinder, and a guide sleeve 62 is integrally formed within the feeder housing, forming a feed cavity 611 between the feeder housing and the guide sleeve 62, and an exhaust hole 6 is provided on the guide sleeve 62. 22 and drain port 623, and one end of the internal guide cavity 621 of the sleeve 62 is connected to the liquid inlet of the feeder housing, and the other end is connected to the air inlet on the feeder housing connected to the hot air blower 5; the piston 63 is installed in the guide cavity 621 by gravity and works in conjunction with the exhaust port 622 and drain port 623 to switch between air replenishment and cleaning fluid replenishment during use; the first pressure pump 64 is set at the liquid inlet of the guide cavity 621 to pressurize the cleaning fluid or clean water provided by the first liquid supply pipe 24 during use, so that it can enter the guide cavity 621 under high pressure and be pumped by water pressure. The piston 63 is pushed upwards by its own weight, opening the drain port 623 for drainage. Simultaneously, the upward movement of the piston 63 blocks the vent port 622, thus supplying cleaning fluid and clean water to the water-air pressurization tank 3 and the cleaning-disinfection tank 4. When the first pressurization pump 64 is shut off, the piston 63 returns to its original position due to gravity as the bottom pressure disappears, sealing the drain port 623. The second pressurization pump 65 is located at the air inlet of the guide chamber 621 and is used to supply cleaning fluid and clean water to the water-air pressurization tank 3 and the cleaning-disinfection tank 4 using the hot air blower 5 and the vent port 622. The disinfection chamber 4 provides high-pressure, high-temperature gas to dry and disinfect the water-gas pressurization chamber 3, the cleaning-disinfection chamber 4, and the anesthesia equipment. The third pressurization pump 66 is located in the liquid-gas outlet connected to the second gas-liquid delivery pipe 32 and is used to pressurize the cleaning liquid or high-temperature gas entering the water-gas pressurization chamber 3. Due to the installation of the first solenoid valve 28 and the second solenoid valve 29, the pressurization pump does not need to be installed in the liquid-gas outlet connected to the first gas-liquid delivery pipe 25. In use, the pressurization effect of the cleaning liquid or high-temperature gas entering the cleaning-disinfection chamber 4 can be achieved solely through the action of the first pressurization pump 64 and the second pressurization pump 65.

[0069] As a preferred embodiment, to facilitate the discharge of wastewater from the water-air pressurization tank 3 and the cleaning-disinfection tank 4 during use, the waste liquid return branch system is designed to include a first drain pipe 34 and a second drain pipe 35 that are interconnected. The other end of the first drain pipe 34 is connected to the pressurization chamber 31 to discharge sewage and anesthetic residue from the water-air pressurization tank 3. The other end of the second drain pipe 35 is connected to the cleaning chamber 41 to discharge sewage and anesthetic residue from the cleaning-disinfection tank 4. Furthermore, to facilitate the control of opening the first drain pipe 34 and the second drain pipe 35 during use, a third solenoid valve 36 is installed on both the first drain pipe 34 and the second drain pipe 35 to control their opening and closing.

[0070] Example 4: Figure 4 , Figure 11 and Figure 12 As shown, to facilitate the placement and fixation of anesthesia equipment such as oxygen masks, laryngoscope lenses, and breathing circuit tubing during use, the cleaning rack 8 is designed to include a positioning frame 81 and a mesh 82 disposed on the positioning frame 81. The mesh 82 is disposed at the bottom and around the perimeter of the positioning frame 81, used to support the anesthesia equipment such as oxygen masks, laryngoscope lenses, and breathing circuit tubing, and to allow the high-pressure water and high-pressure gas sprayed from the anti-backflow nozzle 9 to directly act on the oxygen masks, laryngoscope lenses, and breathing circuit tubing for cleaning and rinsing. In order to enable the cleaning rack 8 to rotate with the turntable 43 during use, a retaining strip 83 is also provided on the positioning frame 81. The retaining strip 83 works in conjunction with the limiting groove 433 disposed on the upper side of the turntable 43. That is, during use, the interaction between the retaining strip 83 and the limiting groove 433 allows the cleaning rack 8 to rotate with the turntable 43, thereby achieving dynamic disinfection and drying of anesthesia equipment such as oxygen masks, laryngoscope lenses, and breathing circuit tubing.

[0071] As a preferred embodiment, to facilitate the clamping of anesthesia equipment such as oxygen masks and breathing circuit tubing during use and prevent them from floating up during cleaning and affecting the cleaning effect, the clamping mechanism 7 is designed to be detachably mounted on the column of the positioning frame 81, including a connector 71, an adjusting pressure member 72, a first clamping member 73, and a second clamping member 74; wherein the connector 71 is detachably mounted on the column of the positioning frame 81; the adjusting pressure member 72 is rotatably mounted on the connector 71 via a torsion spring and works in conjunction with the second clamping member 74, adjusting the relative distance between the first clamping member 73 and the second clamping member 74 by rotating the adjusting pressure member 72; the first clamping member 73 is detachably mounted on the connector 71. The lower end of the connector 71 is used in conjunction with the second clamping member 74. The second clamping member 74 is connected to the connector 71 through a guide block 731 provided on the connector 71. A first spring 75 is also sleeved on the outer end of the guide block 731 and used in conjunction with the second clamping member 74 to reset the second clamping member 74. In order to prevent the first spring 75 from slipping, a positioning plate 732 is also provided at the end of the guide block 731 and used in conjunction with the first spring 75 to limit the first spring 75. In use, the interaction between the first clamping member 73 and the second clamping member 74 is used to clamp anesthesia equipment such as oxygen masks and breathing circuit tubing, so that they are immersed in cleaning solution or clean water.

[0072] Example 5: Figure 4 , Figure 5 , Figure 13 and Figure 14As shown, to facilitate backflow prevention and increase water pressure during use, the clean water, cleaning solution, or drying gas applied to anesthesia equipment such as oxygen masks, laryngoscope lenses, and breathing circuit tubing are high-pressure liquids and gases to ensure cleaning and drying efficiency. The backflow prevention nozzle 9 is designed to include a nozzle housing 91, a guide fluid 92, and a movable body 94 disposed within the nozzle housing 91. The nozzle housing 91 is detachably installed within the cleaning-disinfection box 4, and a guide channel 911 is provided within the nozzle housing 91. The gas-liquid inlet end of the guide channel 911 communicates with the lower liquid inlet chamber of the nozzle housing 91, and the gas-liquid outlet end of the guide channel 911 communicates with the gas-liquid outlet 912 located at the upper end of the nozzle housing 91. The guide fluid 92 is a fixedly installed inverted trapezoidal structure within the nozzle housing 91, and has openings on it. The gas-liquid channel 921 is connected to the gas-liquid nozzle 913 provided on the nozzle housing 91; the movable body 94 is movably installed inside the nozzle housing 91 via the second spring 93 and works in conjunction with the gas-liquid outlet 912 and the guide fluid 92; when gas or liquid acts on the upper end of the movable body 94 through the guide channel 911 and the gas-liquid outlet 912, the second spring 93 is compressed due to the external pressure, the movable body 94 moves downward, and the water or air flows into the gas-liquid channel 921 through the gap between the second spring 93 and the guide fluid 92, and is ejected through the gas-liquid nozzle 913 to pressurize the water or air; when the external water or gas pressure disappears, the second spring 93 returns to its original shape, the movable body 94 resets and re-presses tightly against the guide fluid 92, sealing the gas-liquid channel 921 to achieve the effect of preventing backflow.

[0073] As a preferred embodiment, to facilitate use with the breathing circuit pipeline for cleaning the inside of the breathing circuit pipeline, the upper part of the nozzle housing 91 is bullet-shaped, and an external spiral pattern is provided on the outside to cooperate with the breathing circuit pipeline. In use, the breathing circuit pipeline can be fitted onto the outside of the nozzle housing 91 (without using the cleaning frame 8) and fixed. Then, high-pressure water or drying gas sprayed from the gas-liquid nozzle 913 is used to clean and dry the inside of the breathing circuit pipeline. In order to be applicable to cleaning and drying the inside of the breathing circuit pipeline within a certain diameter range, the nozzle housing 91 is designed to be made of a deformable material (such as plastic), and the cavity at the front end of the nozzle housing 91 is filled with a filler 95 (such as soft rubber) so that the front end of the nozzle housing 91 can deform and recover after being squeezed during use.

[0074] The usage process and mode of the anesthesia equipment cleaning and disinfection device described in Examples 1-5 include:

[0075] Usage process: According to the cleaning needs, first place the anesthesia equipment such as oxygen mask, laryngoscope lens and breathing circuit tubing in the cleaning rack 8, and use the clamping mechanism 7 to fix the anesthesia equipment such as oxygen mask and breathing circuit tubing. Then, put the cleaning rack 8 into the cleaning-disinfection box 4 and fix it on the turntable 43, and then start cleaning, disinfection and drying.

[0076] Usage mode:

[0077] 1. Cleaning Mode: The cleaning-disinfection branch system of the first storage tank 21 for storing cleaning solution is opened, allowing the cleaning solution to enter the reversing supply device 61 through the first supply pipe 24. The first pressurizing pump 64 and / or the third pressurizing pump 66 are controlled to send the cleaning solution to the water-air pressurizing tank 3 and the cleaning-disinfection tank 4 to clean the anesthesia equipment. At the same time, during the cleaning process, the rotating adjustment mechanism drives the cleaning frame 8 to rotate, realizing the dynamic cleaning of anesthesia equipment such as oxygen masks, laryngoscope lenses, and breathing circuit tubing. After cleaning, the wastewater from the cleaning is discharged into the second storage tank 27 through the waste liquid return branch system.

[0078] 2. Cleaning mode: After cleaning is completed, the cleaning-disinfection branch system of the other first liquid storage tank 21 is opened, so that the cleaning fluid enters the reversing supply device 61 through the first liquid supply pipe 24. According to the working process of the cleaning mode, clean water is used to rinse the anesthesia equipment such as water-air pressurization tank 3, cleaning-disinfection tank 4, cleaning-disinfection pipeline system 6, clamping mechanism 7, cleaning rack 8, high pressure nozzle 9, oxygen mask, laryngoscope lens and breathing circuit pipeline to remove the cleaning fluid and anesthetic residues adhering to their surfaces. Finally, the cleaned wastewater is discharged into the second liquid storage tank 27 through the waste liquid return branch system.

[0079] 3. Drying mode: After the above cleaning and tidying modes are completed, the first pressurizing pump 64 is turned off, and the second pressurizing pump 65 and / or the third pressurizing pump 66 are turned on, so that the drying gas in the hot air blower 5 can enter the water-air pressurizing box 3 and the cleaning-disinfection box 4 to dry and disinfect the anesthesia equipment; finally, after disinfection is completed, the top cover of the cleaning-disinfection box 4 is opened and the above anesthesia equipment is taken out to complete the automated cleaning and disinfection process of the anesthesia equipment.

[0080] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0081] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cleaning and disinfection device for anesthesia equipment, comprising a workbench (1), characterized in that: The workbench (1) is equipped with a cleaning fluid circulation mechanism (2), a water-air pressurization tank (3), a cleaning-disinfection tank (4), and a hot air blower (5); The cleaning fluid circulation mechanism (2) and the hot air blower (5) are both connected to the water-air pressurization tank (3) and the cleaning-disinfection tank (4) through the cleaning-disinfection pipeline system (6); The water-air pressurization box (3) is located below the cleaning-disinfection box (4) and is connected to the cleaning-disinfection box (4) through a pressurization pipeline (33); The cleaning-disinfection box (4) is a sealed box structure. A high-pressure nozzle (9) is installed on the inner wall of the cleaning-disinfection box (4) and is connected to the cleaning-disinfection pipeline system (6) and the water-air pressurization box (3). The cleaning-disinfection box (4) is also equipped with a cleaning rack (8), and a clamping mechanism (7) is installed inside the cleaning rack (8).

2. The anesthesia equipment cleaning and disinfection device as described in claim 1, characterized in that: The cleaning fluid circulation mechanism (2) is located on the lower side of the water-air pressurization tank (3), and includes a first storage tank (21) and a second storage tank (27); The first liquid storage tank (21) is connected to the water-air pressurization tank (3) and the cleaning-disinfection tank (4) through the cleaning-disinfection branch system of the cleaning-disinfection pipeline system (6); The second liquid storage tank (27) is connected to the water-air pressurization tank (3) and the cleaning-disinfection tank (4) through the waste liquid return branch system of the cleaning-disinfection pipeline system (6).

3. The anesthesia equipment cleaning and disinfection device as described in claim 2, characterized in that: The cleaning-disinfection branch system includes a first liquid supply pipe (24), a pressure relief return pipe (23), a second gas-liquid supply pipe (32), a first gas-liquid supply pipe (25), and a reversing replenisher (61); One end of the first liquid supply pipe (24) is connected to the first liquid storage tank (21), and the other end is connected to the liquid inlet of the reversing supply device (61); One end of the pressure relief return pipe (23) is connected to the pressurization chamber (31) inside the water-gas pressurization box (3), and the other end is connected to the first liquid storage tank (21). A first overflow valve (231) is provided on the pressure relief return pipe (23). One end of the second gas-liquid delivery pipe (32) and the first gas-liquid delivery pipe (25) are both connected to the liquid-gas outlet of the reversing feeder (61), and the other end of the second gas-liquid delivery pipe (32) is connected to the water-gas pressurization box (3). The other end of the first gas-liquid delivery pipe (25) is connected to the third gas-liquid delivery pipe (42) and the guide path on the side wall of the cleaning-disinfection box (4) through a tee (26), and a solenoid valve is provided on the guide path and the third gas-liquid delivery pipe.

4. The anesthesia equipment cleaning and disinfection device as described in claim 3, characterized in that: The reversing supply device (61) includes a supply device housing, and a piston (63), a first pressurizing pump (64), a second pressurizing pump (65) and a third pressurizing pump (66) disposed in the supply device housing; The outer shell of the replenisher is a four-way connecting cylinder, and a guide sleeve (62) is provided inside the outer shell of the replenisher. The internal flow guiding cavity (621) of the guide sleeve (62) is connected to the exhaust hole (622) and the liquid outlet (623) provided on the side wall of the guide sleeve. The piston (63) is movably disposed within the flow guide cavity (621); The first pressurizing pump (64) is located at the liquid inlet of the guide cavity (621), the second pressurizing pump (65) is located at the air inlet of the guide cavity (621), and the third pressurizing pump (66) is located in the liquid-gas outlet connected to the second gas-liquid delivery pipe (32).

5. The anesthesia equipment cleaning and disinfection device as described in claim 2, characterized in that: The waste liquid return branch system includes a first sewage pipe (34) and a second sewage pipe (35) that are interconnected. The other end of the first sewage pipe (34) is connected to the pressurization chamber (31), and the other end of the second sewage pipe (35) is connected to the cleaning chamber (41). A third solenoid valve (36) is installed on both the first sewage pipe (34) and the second sewage pipe (35).

6. The anesthesia equipment cleaning and disinfection device as described in claim 1, characterized in that: The cleaning-disinfection box (4) is also equipped with a rotation adjustment mechanism, which includes a turntable (43), a motor (44) and a drive gear (46); The turntable (43) has a disc-shaped structure. On the turntable (43), symmetrically arranged limit plates (431) are used in conjunction with positioning rings (48) arranged in the cleaning-disinfection box (4). A slot (432) is formed between the two limit plates (431), and a roller (47) is also arranged in the slot (432) to contact the bottom of the middle limit groove of the positioning ring (48). The motor (44) is located on the lower side of the positioning ring (48); The drive gear (46) is located at the drive end of the motor (44) and meshes with the gear ring (45) located at the bottom of the turntable (43).

7. The anesthesia equipment cleaning and disinfection device as described in claim 6, characterized in that: The cleaning rack (8) includes a positioning frame (81) and a mesh (82) set on the positioning frame (91). A retaining strip (83) is also provided on the positioning frame (81), which works in conjunction with a limiting slot (433) set on the upper side of the turntable (43).

8. The anesthesia equipment cleaning and disinfection device as described in claim 7, characterized in that: The clamping mechanism (7) includes a connector (71), an adjusting pressure member (72), a first clamping member (73), and a second clamping member (74); The connector (71) is detachably mounted on the column of the positioning frame (81); The adjusting pressure member (72) is rotatably mounted on the connecting member (71) by a torsion spring and is used in conjunction with the second clamping member (74); The first clamping member (73) is disposed at the lower end of the connector (71) and is used in conjunction with the second clamping member (74); The second clamping member (74) is connected to the connector (71) via a guide block (731) on the connector (71), and a first spring (75) is also sleeved on the guide block (731) to cooperate with the second clamping member (74).

9. The anesthesia equipment cleaning and disinfection device as described in claim 1, characterized in that: The anti-backflow nozzle (9) includes a nozzle housing (91), a guide fluid (92) and a movable body (94) disposed within the nozzle housing (91); The nozzle housing (91) is detachably installed inside the cleaning-disinfection box (4), and a flow guide channel (911) is provided inside the nozzle housing (91); The guide fluid (92) is a trapezoidal structure fixedly installed on the nozzle housing (91), and a gas-liquid channel (921) is provided on the guide fluid (92) to communicate with the gas-liquid nozzle (913) provided on the nozzle housing (91); The movable body (94) is disposed inside the nozzle housing (91) by a second spring (93).

10. The anesthesia equipment cleaning and disinfection device as described in claim 9, characterized in that: The upper part of the nozzle housing (91) has a bullet-shaped structure. An external spiral pattern is provided on the outside of the nozzle housing (91) to cooperate with the breathing circuit pipe. A filler (95) is filled in the cavity at the front end of the nozzle housing (91).