A respiratory gas absorbing filter

Abstract

This application relates to the field of medical device technology, and more particularly to a respiratory gas absorption filter, comprising a housing, an air inlet pipe and an air outlet pipe disposed on the housing, a guide vane disposed on the air inlet pipe, a first thin cotton and a first thick cotton disposed at one end of the interior of the housing, and a second thick cotton, a plastic sheet, corrugated paper and a second thin cotton disposed at the other end of the interior of the housing, wherein the plastic sheet is uniformly provided with at least one vent hole, and an adsorption medium is disposed inside the housing. Therefore, a respiratory gas absorption filter can solve the technical problems of existing adsorption media having fine particles that are easily squeezed out from the gap between the adsorption cotton and the canister under the impact of high-frequency airflow or equipment vibration of anesthesia machines, and the simple pore structure of the adsorption cotton material used in traditional adsorption canisters, which causes condensate to accumulate inside the canister under long-term gas exposure.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and more specifically, to a respiratory gas absorption filter. Background Technology

[0002] In anesthesia respiratory systems, carbon dioxide adsorption canisters are core components for removing carbon dioxide and volatile drugs from exhaled air. The adsorption medium inside is fixed using materials such as absorbent cotton. However, existing methods of fixing the medium in adsorption canisters have significant drawbacks: the fine particles of the adsorption medium are easily squeezed out from the gaps between the absorbent cotton and the canister body under the impact of high-frequency airflow or equipment vibration, leading to an imbalance in medium distribution. This not only weakens the carbon dioxide removal efficiency, but the squeezed-out particles may also enter the patient's breathing circuit, posing a safety hazard.

[0003] Traditional adsorption canisters use absorbent cotton materials with a simple pore structure, which leads to condensation buildup inside the canister under prolonged exposure to gas. This condensation not only increases the risk of postoperative infection but can also corrode anesthesia equipment, further shortening its lifespan.

[0004] Furthermore, existing adsorption canisters have limited ability to block particulate matter in anesthetic gases. Patient exhaled air often contains tiny particles such as respiratory secretions, drug crystals, and debris from the adsorption medium. The mechanical interception of a single layer of adsorption cotton is insufficient to effectively filter submicron-sized particles. Unblocked particles may directly enter the breathing circuit, threatening the patient's health. Although some improvement solutions attempt to enhance medium fixation by adding filters or chemical adhesives, these methods often increase airflow resistance or introduce the risk of chemical contamination, failing to meet clinical requirements for low-resistance, high-efficiency, safe, and clean anesthesia equipment. Utility Model Content

[0005] Based on the above problems, this application proposes a respiratory gas absorption filter to solve the technical problems of existing adsorption media particles being too small, easily squeezed out from the gap between the adsorption cotton and the tank body under the impact of high-frequency airflow or equipment vibration of anesthesia machine, and the adsorption cotton material used in traditional adsorption tanks having a simple pore structure, causing condensate to accumulate in the tank under long-term gas action.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0007] A respirable gas absorption filter includes a housing, an air inlet pipe and an air outlet pipe provided on the housing, a guide vane provided on the air inlet pipe, a first thin cotton and a first thick cotton provided at one end of the interior of the housing, and a second thick cotton, a plastic sheet, corrugated paper and a second thin cotton provided at the other end of the interior of the housing, with air vents evenly distributed on the plastic sheet, at least one air vent provided, and an adsorption medium provided inside the housing.

[0008] In one specific implementation, the air inlet pipe and the air outlet pipe have a double-layer sleeve structure, and the diameter of the guide vane is larger than the diameter of the inner pipe of the air inlet pipe.

[0009] In one specific implementation, the upper surface of the guide vane is spherical, and a ventilation hole is provided at the center of the guide vane.

[0010] In one specific implementation, the plastic sheet is fixedly connected to the inner wall of the housing.

[0011] In one specific implementation, the first thin cotton and the first thick cotton are arranged sequentially inside the housing near the air inlet pipe.

[0012] In one specific implementation scheme, the second thin cotton, the corrugated paper, the plastic sheet, and the second thick cotton are arranged sequentially inside the housing near the air outlet pipe.

[0013] In one specific implementation, the adsorption medium is located between the first thick cotton and the second thick cotton.

[0014] The positive effects of this utility model are:

[0015] The internal structure of the shell employs a double-end clamping structure consisting of "first thin cotton + first thick cotton" and "second thick cotton + plastic sheet + corrugated paper + second thin cotton," tightly encasing the adsorption medium between the two layers of thick cotton. The plastic sheet achieves uniform gas distribution through vents, and its fixed connection design, combined with the three-dimensional support of the corrugated paper, forms a three-dimensional limiting network.

[0016] The three-dimensional dynamic stabilization system effectively constrains the displacement of the adsorption medium under airflow impact and mechanical vibration through the synergistic effect of the multi-layer limiting structure and water-locking corrugated paper, ensuring uniform and stable medium distribution, significantly improving carbon dioxide removal efficiency, eliminating the risk of particle leakage, and ensuring the respiratory safety of patients. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is an enlarged view of the structure at point A of this utility model;

[0020] Explanation of reference numerals in the attached figures

[0021] 1. Shell; 2. Inlet duct; 3. Outlet duct; 4. Guide vane; 5. First thin cotton; 6. First thick cotton; 7. Second thick cotton; 8. Plastic sheet; 9. Corrugated paper; 10. Second thin cotton; 11. Ventilation hole; 12. Adsorption medium; 13. Ventilation hole. Detailed Implementation

[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] Example

[0024] like Figure 1-2 As shown, a breathing gas absorption filter includes a housing 1, with an air inlet pipe 2 at the top and an air outlet pipe 3 at the bottom. A spherical guide vane 4 is provided inside the air inlet pipe 2, with a ventilation hole 13 in the center of the guide vane 4. The radius of the spherical surface matches the inner diameter of the air inlet pipe 2 to ensure uniform gas distribution.

[0025] The shell 1 has a layered structure inside. Near the air inlet pipe 2, the first thin cotton layer 5 and the first thick cotton layer 6 are arranged in sequence. The thin cotton layer is medical degreased cotton with a thickness of 1-2mm, and the thick cotton layer is high-density fiber cotton with a thickness of 5-8mm, forming primary filtration and media buffer.

[0026] Rear-end fixing layer: The second thin cotton 10, the corrugated paper 9, the plastic sheet 8, and the second thick cotton 7 are sequentially arranged near the air outlet duct 3. The plastic sheet 8 has evenly distributed air vents 11, with at least one vent 11, effectively preventing the adsorbent medium 12 from overflowing from the housing 1. The corrugated paper 9 undergoes hydrophilic modification treatment, exhibiting humidity-responsive characteristics.

[0027] The adsorption medium 12 is filled between the first thick cotton layer 6 and the second thick cotton layer 7, and is composed of quicklime particles with a particle size of 1-3 mm and silica gel particles with a particle size of 0.5-1 mm in a mass ratio of 3:1. The plastic sheet 8 is fixed to the inner wall of the shell 1 to ensure structural stability.

[0028] Working principle:

[0029] The anesthetic gas enters the device through the inlet pipe 2. The spherical guide vane 4 evenly disperses the airflow to the front thin cotton layer, initially filtering out large particulate impurities. The gas passes through the first thick cotton layer 6 and enters the adsorption medium layer 12, where soda lime and silica gel synergistically adsorb CO2 and volatile drugs. The trace amounts of gas that are not completely adsorbed enter the second thick cotton layer 7 at the rear end. After being rectified by the micropores of the plastic sheet 8, the moisture is intercepted by the corrugated paper layer 9, and the dry gas is finally discharged through the outlet pipe 3.

[0030] Positive effects:

[0031] The multi-layered cotton structure and the plastic sheet 8 form a three-dimensional limiting network, which, together with the mechanical support of the corrugated paper 9, effectively prevents the adsorption medium 12 from shifting when the airflow impact velocity is ≤20L / min or the equipment vibration frequency is ≤50Hz, thus ensuring stable adsorption efficiency.

[0032] Modified corrugated paper 9 remains fluffy and breathable when dry. When the humidity is >80%, the hydrophilic groups are activated, absorb water and swell to form a gel layer, which prevents the diffusion of condensate and significantly reduces the risk of loop infection.

[0033] The combined action of front-end mechanical interception, mid-end electrostatic adsorption, and back-end precision filtration achieves efficient blocking of particles of all sizes, such as respiratory secretions and drug crystals, ensuring gas cleanliness.

[0034] The spherical guide vane 4, combined with the double-layer sleeve duct design, allows the airflow to pass through the adsorption medium in a laminar state, reducing pressure loss by about 40%, lowering equipment operating noise, and extending the service life of the adsorption medium 12.

[0035] Finally, 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.

[0036] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A respiratory gas absorption filter, characterized in that, The device includes a housing (1), on which an air inlet pipe (2) and an air outlet pipe (3) are provided. A guide plate (4) is provided on the air inlet pipe (2). A first thin cotton (5) and a first thick cotton (6) are provided at one end inside the housing (1). A second thick cotton (7), a plastic sheet (8), corrugated paper (9) and a second thin cotton (10) are provided at the other end inside the housing (1). Ventilation holes (11) are uniformly provided on the plastic sheet (8). At least one ventilation hole (11) is provided. An adsorption medium (12) is provided inside the housing (1).

2. A respiratory gas absorption filter according to claim 1, characterized in that, The air inlet pipe (2) and the air outlet pipe (3) are double-layer sleeve structures, and the diameter of the guide vane (4) is larger than the inner diameter of the air inlet pipe (2).

3. A respiratory gas absorption filter according to claim 1, characterized in that, The upper surface of the guide vane (4) is spherical, and a ventilation hole (13) is provided at the center of the guide vane (4).

4. A respiratory gas absorption filter according to claim 1, characterized in that, The plastic sheet (8) is fixedly connected to the inner wall of the shell (1).

5. A respiratory gas absorption filter according to claim 1, characterized in that, Inside the housing (1), the first thin cotton (5) and the first thick cotton (6) are arranged in sequence near the air inlet pipe (2).

6. A respiratory gas absorption filter according to claim 1, characterized in that, Inside the housing (1), near the air outlet pipe (3), the second thin cotton (10), the corrugated paper (9), the plastic sheet (8), and the second thick cotton (7) are arranged in sequence.

7. A respiratory gas absorption filter according to claim 1, characterized in that, The adsorption medium (12) is located between the first thick cotton (6) and the second thick cotton (7).

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