Breathing filter and anesthesia equipment

Abstract

The invention discloses a breathing filter and anesthesia equipment, and relates to the technical field of medical equipment.The breathing filter comprises an outer shell and at least one flow dividing net, an air inlet and an air outlet are formed in the two ends of the outer shell respectively, and an adsorption layer used for adsorbing carbon dioxide is arranged in the outer shell; the adsorption layer is located between the air inlet and the air outlet in the axial direction of the outer shell; the shunting net is arranged between the adsorption layer and the air inlet; when mixed airflow flowing in from the air inlet passes through the flow dividing net, the flow dividing net guides the mixed airflow to diffuse in the radial direction of the outer shell, and the mixed airflow flows through the adsorption layer in the axial direction of the outer shell and then is discharged from the air outlet. The airflow path is changed from an axial linear type to a radial diffusion type, and the mixed airflow expands along the radial direction of the outer shell to cover the cross section of the whole adsorption layer, so that the effective contact area of the mixed airflow and the adsorbent is increased, the effective working time is prolonged, and the replacement frequency in a long-time operation is reduced; the operation safety is improved on the premise that the operation efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a respiratory filter and anesthesia device. Background Technology

[0002] Anesthesia machines are indispensable key medical devices in surgical procedures. Their core function is to provide patients with precise and controllable general anesthesia support. During general anesthesia, the anesthesia machine uses oxygen as a carrier to deliver a mixture of anesthetic gases to the patient's lungs. The gas diffuses through the alveoli into the bloodstream, acting on the central nervous system to produce reversible loss of consciousness, analgesia, and muscle relaxation, thereby achieving general anesthesia.

[0003] Anesthesia machines typically have a breathing filter in their breathing circuit. The patient's exhaled air contains not only carbon dioxide produced by metabolism, but also unconsumed oxygen and some anesthetic gases. When this mixture enters the breathing filter, the adsorbent reacts chemically with the carbon dioxide, efficiently removing it while retaining the oxygen and anesthetic gases. This allows the oxygen and anesthetic gases to re-enter the anesthesia machine and participate in the next breathing cycle, thus achieving both the reuse of anesthetic gases and maintaining a stable gas composition in the respiratory environment.

[0004] However, existing breathing filters face numerous problems in practical use. Limited by the characteristics of existing adsorbent materials and the internal structural design of breathing filters, airflow distribution is often uneven, resulting in the adsorbent not being fully utilized. This often leads to premature saturation and failure in some areas while other areas have not yet fully participated in the reaction, resulting in a reduced effective adsorption capacity and a shorter overall usage time. Especially during prolonged surgeries or high-volume ventilation, medical staff need to change breathing filters multiple times during surgery, which not only disrupts the surgical rhythm and prolongs the operation time but may also affect the stability of anesthesia due to fluctuations in the supply of anesthetic gas, increasing surgical risks.

[0005] Therefore, how to optimize the structure of the breathing filter to improve surgical efficiency while ensuring surgical safety is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide a respiratory filter and anesthesia device. By adding a diversion net, the airflow path is changed from an axial straight line to a radial diffusion type, which enhances the effective contact area between the mixed airflow and the adsorbent, extends the effective working time, and improves surgical safety while improving surgical efficiency. This solves the technical problem that the frequent replacement of existing respiratory filters leads to a decrease in surgical efficiency and surgical safety.

[0007] To achieve the above objectives, the present invention provides a breathing filter, comprising:

[0008] The outer shell has an air inlet and an air outlet at its two ends, and an adsorption layer for adsorbing carbon dioxide is provided inside the outer shell; along the axial direction of the outer shell, the adsorption layer is located between the air inlet and the air outlet.

[0009] At least one flow divider is provided between the adsorption layer and the air inlet; when the mixed airflow flows in from the air inlet and passes through the flow divider, the flow divider is used to guide the mixed airflow to diffuse radially along the outer shell and flow axially through the adsorption layer and then be discharged from the air outlet.

[0010] In some embodiments, the flow divider is provided with a plurality of through flow divider holes, all of which are distributed in a ring to surround the flow divider section. The flow divider section is provided with a guide section at its center, which is used to guide the mixed airflow to flow radially toward the flow divider section along the outer shell.

[0011] In some embodiments, along the axial direction of the outer casing, the flow guide protrudes in a direction away from the adsorption layer to form a flow divider cone, which is used to guide the mixed airflow to flow radially along the outer casing.

[0012] In some embodiments, the outer casing is provided with an inlet buffer chamber and an outlet buffer chamber at both ends, the inlet buffer chamber being located between the inlet end and the inlet of the adsorption layer, and the outlet buffer chamber being located between the outlet end and the outlet of the adsorption layer; the diversion network includes:

[0013] The air intake splitter is fixed in the air intake buffer chamber. The air intake splitter is used to guide the mixed airflow flowing through the air intake to diffuse radially along the outer shell to cover the air intake end of the adsorption layer.

[0014] An exhaust gas diversion net is fixed in the exhaust gas buffer chamber. The exhaust gas diversion net is used to guide the mixed airflow passing through the adsorption layer to diffuse radially along the outer shell to cover the exhaust end of the adsorption layer.

[0015] In some embodiments, the housing includes:

[0016] An air inlet end cap has an air inlet protruding from the center. Several air inlet guide vanes are fixed on the side of the air inlet end cap facing the adsorption layer. All air inlet guide vanes are evenly distributed along the circumference of the outer shell. An air inlet guide groove is formed between any two adjacent air inlet guide vanes. The air inlet guide groove is used to guide the mixed airflow through the air inlet to flow radially along the outer shell to the air inlet buffer chamber.

[0017] The shell body has an integrally formed air outlet end cap at one end and an air inlet end cap at the other end. The center of the air outlet end cap has an air outlet. Several air outlet guide plates are fixed on the side of the air outlet end cap facing the adsorption layer. All the air outlet guide plates are evenly distributed along the circumference of the shell body. An air outlet guide groove is formed between any two adjacent air outlet guide plates. The air outlet guide groove is used to guide the mixed gas in the air outlet buffer chamber to converge towards the air outlet along the radial direction of the shell body.

[0018] In some embodiments, it also includes:

[0019] The air intake water absorption layer is fixed between the air intake end of the adsorption layer and the air intake distribution network. The air intake water absorption layer is used to absorb moisture in the mixed airflow from the air intake distribution network to the adsorption layer.

[0020] The air outlet water absorption layer is fixed between the air outlet end of the adsorption layer and the air outlet distribution network. The air outlet water absorption layer is used to absorb moisture in the mixed airflow from the adsorption layer to the air outlet distribution network.

[0021] In some embodiments, an air inlet end cap is provided with an air inlet limiting ring protruding from one end face facing the adsorption layer; along the axial direction of the outer shell, the two ends of the air inlet diverter mesh abut against the air inlet limiting ring and the air inlet water absorption layer, respectively; the edge of the air inlet diverter mesh is provided with an air inlet radial limiting ring, and the air inlet radial limiting ring abuts against the air inlet end limiting ring along the radial direction of the outer shell.

[0022] And / or, the end face of the outlet cap facing the adsorption layer is provided with an outlet end limiting ring; along the axial direction of the outer shell, the two ends of the outlet diversion net abut against the outlet end limiting ring and the outlet water absorption layer respectively; the edge of the outlet diversion net is provided with an outlet radial limiting ring, and the outlet radial limiting ring abuts against the outlet end limiting ring along the radial direction of the outer shell.

[0023] In some embodiments, it also includes:

[0024] An intake filter layer is fixed between the intake end cover and the intake splitter mesh. The intake filter layer is used to filter the mixed airflow from the intake port to the intake splitter mesh. The intake end cover has an intake end fixing ring protruding on the end face facing the adsorption layer, and the intake splitter mesh has an intake support ring protruding on the end face away from the adsorption layer. The intake filter layer is fixed between the intake end fixing ring and the intake support ring.

[0025] An exhaust filter layer is fixed between the exhaust end cap and the exhaust distribution network. The exhaust filter layer is used to filter the mixed airflow from the exhaust distribution network to the exhaust port. An exhaust end fixing ring is provided on the end face of the exhaust end cap facing the adsorption layer, and an exhaust support ring is provided on the end face of the exhaust distribution network away from the adsorption layer. The exhaust filter layer is fixed between the exhaust end fixing ring and the exhaust support ring.

[0026] In some embodiments, a window is provided on the portion of the outer shell opposite to the adsorption layer, and the window is provided with scale markings for displaying the adsorption state of the adsorption layer.

[0027] The present invention also provides an anesthesia device, including the above-described breathing filter.

[0028] Compared to the prior art, this invention optimizes the structure of the breathing filter by adding at least one diverter mesh within the filter. The diverter mesh is positioned between the adsorption layer and the air inlet. The outer shell has an air inlet and an air outlet at its two ends, respectively, and the adsorption layer is positioned axially between the air inlet and outlet. During surgery, the mixed airflow flowing in from the air inlet passes through the diverter mesh, which diverts the airflow, guiding it to first diffuse radially along the outer shell, then flow axially through the adsorption layer to remove carbon dioxide from the mixed gas, and finally exits from the outlet.

[0029] This invention transforms the airflow path from an axial linear pattern to a radial diffusion pattern by adding a diversion net. Specifically, using the central axis of the outer shell as a reference, the diversion net guides the mixed airflow to expand radially along the shell, covering the entire cross-section of the adsorption layer. This enhances the effective contact area between the mixed airflow and the adsorbent, avoiding premature saturation of the adsorbent and insufficient utilization of surrounding materials caused by excessive concentration of the mixed airflow. Through active control of the airflow distribution, the adsorption layer is utilized uniformly, effectively activating its overall adsorption capacity, increasing the utilization rate of adsorbent per unit volume, extending the effective working time of the breathing filter, reducing the frequency of replacement during prolonged surgeries, maintaining the continuity of the surgical process, shortening the overall surgical time, and reducing unexpected fluctuations in intraoperative anesthesia depth, thereby improving surgical safety while enhancing surgical efficiency. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0031] Figure 1 This is a cross-sectional view of a breathing filter provided in a specific embodiment of the present invention;

[0032] Figure 2 for Figure 1 A magnified view of a portion of the image;

[0033] Figure 3 for Figure 1 Exploded view;

[0034] Figure 4 This is an airflow diagram of a breathing filter provided in a specific embodiment of the present invention;

[0035] Figure 5 for Figure 1 Schematic diagram of the middle air intake end cap;

[0036] Figure 6 for Figure 1 Schematic diagram of the middle shell body;

[0037] Figure 7 for Figure 1 A frontal view of the central distribution network;

[0038] Figure 8 for Figure 1 A schematic diagram of the back of the central diversion network;

[0039] Figure 9 for Figure 1 Schematic diagram of the middle air intake filter layer;

[0040] Figure 10 for Figure 1 A schematic diagram of the inner and outer shell and its scale markings;

[0041] Figure 11 for Figure 1 Another schematic diagram of the inner and outer shell and its scale markings.

[0042] The attached figures are labeled as follows:

[0043] Outer shell 1;

[0044] Air inlet 11, air outlet 12, air inlet buffer chamber 13, air outlet buffer chamber 14, air inlet end cap 15, shell body 16, viewing window 17 and scale markings 18;

[0045] Intake guide vane 151, intake guide groove 152, intake end limiting ring 153 and intake end fixing ring 154;

[0046] Air outlet end cap 161, air outlet guide vane 162 and air outlet guide groove 163;

[0047] Air outlet limiting ring 1611 and air outlet fixing ring 1612;

[0048] Diversion network 2;

[0049] The flow divider 201, the flow divider 202, the flow guide 203, and the flow divider cone 204;

[0050] Intake splitter 21 and exhaust splitter 22;

[0051] Intake radial limiting ring 211 and intake support ring 212;

[0052] Outlet radial limiting ring 221 and outlet support ring 222;

[0053] Adsorption layer 3;

[0054] Inlet water-absorbing layer 41 and outlet water-absorbing layer 42;

[0055] Intake filter layer 51 and exhaust filter layer 52. Detailed Implementation

[0056] 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.

[0057] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0058] This invention discloses a breathing filter, as shown in the attached figure. Figure 1 and 3 As shown, the device includes an outer shell 1 and at least one diversion net 2. The outer shell 1 has a structure that is thicker in the middle and thinner at both ends. Specifically, a receiving cavity is formed in the middle of the outer shell 1, and an air inlet 11 and an air outlet 12 are respectively provided at both ends of the outer shell 1. The diameters of the air inlet 11 and the air outlet 12 are much smaller than the diameter of the receiving cavity. The air inlet 11 is connected to the outlet of the breathing circuit, and the air outlet 12 is connected to the inlet of the anesthesia machine.

[0059] An adsorption layer 3 is provided inside the outer casing 1 for adsorbing carbon dioxide. The adsorption layer 3 is housed within the receiving cavity and is a cylindrical structure composed of deposited particulate matter, which can be calcium hydroxide particles or sodium hydroxide particles. The diameter of the adsorption layer 3 is equal to the inner diameter of the receiving cavity, and the height of the adsorption layer 3 is less than the depth of the receiving cavity. Along the axial direction of the outer casing 1, the adsorption layer 3 is located between the air inlet 11 and the air outlet 12, ensuring that the incoming mixed airflow must pass through the adsorption layer 3 before being discharged, thus forcibly completing the adsorption and purification of carbon dioxide.

[0060] One of the flow dividers 2 is located between the adsorption layer 3 and the air inlet 11. When the mixed airflow flows in from the air inlet 11 and passes through the flow divider 2, the flow divider 2 guides the mixed airflow to diffuse radially along the outer shell 1, and then flows axially along the outer shell 1 through the adsorption layer 3 before being discharged from the air outlet 12. During surgery, the mixed airflow flows into the outer shell 1 along the air inlet 11, passes through the flow divider 2, and is divided, guiding the mixed airflow to first diffuse radially along the outer shell 1, then flow axially along the outer shell 1 through the adsorption layer 3 to remove carbon dioxide from the mixed gas, and finally be discharged from the air outlet 12.

[0061] This invention, by adding a diversion net 2, changes the airflow path from the original axial linear type to a radial diffusion type. Specifically, with the central axis of the outer shell 1 as a reference, the diversion net 2 guides the mixed airflow to expand radially along the outer shell 1, covering the entire cross-section of the adsorption layer 3. This enhances the effective contact area between the mixed airflow and the adsorbent, avoiding premature saturation of the adsorbent and insufficient utilization of surrounding materials caused by excessive concentration of the mixed airflow. Through active regulation of the airflow distribution, the adsorption layer 3 is utilized uniformly, effectively activating its overall adsorption capacity, increasing the utilization rate of adsorbent per unit volume, extending the effective working time of the respiratory filter, reducing the frequency of replacement during long surgeries, maintaining the continuity of the surgical process, shortening the overall surgical time, and reducing unexpected fluctuations in intraoperative anesthesia depth, thereby improving surgical safety while increasing surgical efficiency.

[0062] As a preferred embodiment, as shown in the appendix Figure 7 and 8 As shown, the flow divider 2 has several through-holes 201 for the passage of mixed airflow. All the flow dividers 201 are arranged in a ring to surround the flow divider 202. The flow divider 202 has a hollow structure to divide the mixed airflow radially along the outer shell 1. The center of the flow divider 202 has a guide section 203. The guide section 203 has a solid structure. When the mixed airflow collides with the guide section 203 along the axial direction of the outer shell 1, the flow direction of the mixed airflow changes from axial to radial, so that the guide section 203 guides the mixed airflow to flow radially along the outer shell 1 to the flow divider 202.

[0063] Considering that the air inlet 11 and the air outlet 12 are connected along the axial direction of the outer shell 1, in order to prevent the airflow from being short-circuited and discharged without being purified by the adsorption layer 3 due to the axial connection between the two, the diameters of both the air inlet 11 and the air outlet 12 are smaller than the diameter of the guide part 203. This increases the diffusion pressure of the mixed airflow, promotes more uniform radial dispersion of the mixed airflow, forces the mixed airflow to diffuse outward and pass through the entire cross section of the adsorption layer 3, avoids the mixed airflow from directly penetrating along the axial direction and bypassing the adsorption material, and ensures that all mixed airflows are fully purified by the adsorption layer 3.

[0064] As a preferred embodiment, as shown in the appendix Figure 7 As shown, along the axial direction of the outer shell 1, the guide portion 203 protrudes away from the adsorption layer 3 to form a flow divider cone 204, which is used to guide the mixed airflow to flow radially along the outer shell 1. This can force the mixed airflow to diffuse to the periphery, so that the mixed airflow can fully cover the entire cross-sectional area of ​​the adsorption layer 3. It can also increase the flow cross-sectional area, reduce the flow velocity, prolong the residence time of the mixed airflow in the adsorption layer 3, increase the sufficiency of the chemical reaction between carbon dioxide and adsorbent, and improve the single adsorption efficiency.

[0065] In a preferred embodiment, the outer casing 1 has an inlet buffer chamber 13 and an outlet buffer chamber 14 at its two ends. The inlet buffer chamber 13 is located between the inlet end of the adsorption layer 3 and the inlet port 11, absorbing and smoothing the periodically fluctuating mixed airflow from the breathing circuit, providing a stable mixed airflow for the adsorption layer 3, avoiding a decrease in adsorption efficiency or local impact caused by flow fluctuations, achieving preliminary velocity uniformity and pressure balance before the mixed airflow enters the diversion network 2, improving the uniformity of subsequent radial diffusion, and further optimizing the utilization efficiency of the adsorbent. The outlet buffer chamber 14 is located between the outlet end of the adsorption layer 3 and the outlet port 12, collecting and integrating the purified gas after flowing through the adsorption layer 3, eliminating local velocity differences, ensuring that the composition and pressure of the discharged airflow are uniform and stable, reducing the impact of instantaneous pressure fluctuations caused by changes in patient respiration on the precision components inside the anesthesia machine, and improving the reliability of the anesthesia machine.

[0066] The intake buffer chamber 13 and the exhaust buffer chamber 14 are combined to form a two-stage buffer structure, which reduces airflow noise and mechanical vibration caused by sudden changes in flow velocity or flow direction of the mixed airflow, and provides additional pressure regulation capability to maintain the relative stability of airflow pressure under different ventilation conditions, ensuring stability and reliability in the carbon dioxide adsorption and gas purification process.

[0067] As a preferred embodiment, the outer shell 1 is provided with two diversion nets 2, which are respectively located at both ends of the adsorption layer 3. This ensures that the gas distribution and residence time in the thickness direction of the adsorption layer 3 are consistent, thereby improving the utilization rate of the unit adsorbent and extending the service life of the breathing filter.

[0068] Specifically, as shown in the appendix Figure 1 As shown, the diversion network 2 includes an inlet diversion network 21 and an outlet diversion network 22. The inlet diversion network 21 is fixed in the inlet buffer chamber 13 and is used to guide the mixed airflow flowing through the inlet 11 to diffuse radially along the outer shell 1, ensuring that the mixed airflow fully covers the entire inlet end cross section of the adsorption layer 3. This allows the mixed airflow to complete preliminary diffusion before entering the adsorption layer 3, effectively eliminating the concentration of airflow velocity at the inlet 11 and improving the uniformity of airflow distribution at the inlet end of the adsorption layer 3. The outlet diversion network 22 is fixed in the outlet buffer chamber 14 and is used to guide the mixed airflow flowing through the adsorption layer 3 to diffuse radially along the outer shell 1, covering the outlet end of the adsorption layer 3. This allows the purified mixed airflow to be radially redistributed before discharge, eliminating local airflow concentration or stagnation caused by the resistance difference of the adsorption layer 3, ensuring that the gas in each area of ​​the outlet end of the adsorption layer 3 is evenly discharged, and improving the overall utilization efficiency of the adsorbent.

[0069] As a preferred embodiment, as shown in the appendix Figure 1As shown, the outer casing 1 has a split structure, including an air inlet cap 15 and a casing body 16. The air inlet cap 15 has a central protrusion with an air inlet 11. One end of the casing body 16 has an integrally formed air outlet cap 161, and the other end is fastened with the air inlet cap 15. The central protrusion of the air outlet cap 161 has an air outlet 12. Specifically, there are interlocking protrusions and interlocking grooves between the open end faces of the air inlet cap 15 and the casing body 16. In addition, the end of the air inlet cap 15 facing the casing has a connecting flange, which cooperates with the casing body 16 to eliminate the risk of leakage between the air inlet cap 15 and the casing body 16 and improve the sealing performance of the outer casing 1.

[0070] As attached Figure 1 and 5 As shown, the intake end cap 15 is fixed to a number of intake guide vanes 151 on the side facing the adsorption layer 3. All the intake guide vanes 151 are evenly distributed along the circumference of the outer shell 1. An intake guide groove 152 is formed between any two adjacent intake guide vanes 151 to guide the mixed airflow through the intake port 11 to flow radially along the outer shell 1 to the intake buffer chamber 13, thereby reducing the local resistance and turbulence intensity of the mixed airflow during the turning process and reducing the noise and vibration caused by the airflow impact.

[0071] As attached Figure 1 and 6 As shown, the outlet end cap 161 is fixed to a number of outlet guide plates 162 on the side facing the adsorption layer 3. All outlet guide plates 162 are evenly distributed along the circumference of the outer shell 1. An outlet guide groove 163 is formed between any two adjacent outlet guide plates 162 to guide the mixed gas in the outlet buffer chamber 14 to converge towards the outlet 12 along the radial direction of the outer shell 1, so as to avoid turbulence or local stagnation of the mixed airflow near the outlet 12 and ensure that the mixed airflow is discharged smoothly.

[0072] The intake manifold 21 and the intake end cap 15, and the exhaust manifold 22 and the exhaust end cap 161 are fixed together by ultrasonic welding or adhesive. The intake end cap 15 and the housing body 16 can also be fixed and sealed by ultrasonic welding or adhesive.

[0073] As a preferred embodiment, as shown in the appendix Figure 1As shown, the breathing filter includes an inlet water-absorbing layer 41 and an outlet water-absorbing layer 42. The inlet water-absorbing layer 41 is fixed between the air inlet end of the adsorption layer 3 and the air inlet diversion net 21, and is used to absorb moisture in the mixed airflow flowing from the air inlet diversion net 21 to the adsorption layer 3. It effectively intercepts and absorbs the moisture carried in the mixed airflow, preventing moisture from entering the adsorption layer 3 and causing it to clump, which would reduce its chemical reactivity and maintain the adsorbent's ability to remove carbon dioxide. The outlet water-absorbing layer 42 is fixed between the air outlet end of the adsorption layer 3 and the outlet diversion net 22, and is used to absorb moisture in the mixed airflow flowing from the adsorption layer 3 to the outlet diversion net 22. It actively intercepts and absorbs residual moisture, preventing moisture from entering the anesthesia machine, reducing the formation of condensate, avoiding bacterial growth caused by water accumulation, and reducing the corrosion and interference of moisture on the precision components inside the anesthesia machine, which is beneficial to extending the service life of the anesthesia machine. Specifically, both the inlet water-absorbing layer 41 and the outlet water-absorbing layer 42 can be absorbent sponges.

[0074] As a preferred embodiment, as shown in the appendix Figure 1 As shown, the end face of the air inlet cap 15 facing the adsorption layer 3 has an air inlet limiting ring 153 protruding from it. Along the axial direction of the outer shell 1, the two ends of the air inlet diverter net 21 abut against the air inlet limiting ring 153 and the air inlet water absorption layer 41, respectively, to limit the position of the air inlet diverter net 21 along the axial direction of the outer shell 1, precisely control the axial distance between the air inlet diverter net 21 and the air inlet 11, and ensure that the mixed airflow has a suitable flow velocity and direction when it contacts the air inlet diverter net 21, thereby improving the starting efficiency of radial diffusion. The edge of the air inlet diverter net 21 has an air inlet radial limiting ring 211 protruding from it. The air inlet radial limiting ring 211 abuts against the air inlet limiting ring 153 along the radial direction of the outer shell 1, and is used to limit the position of the air inlet diverter net 21 along the radial direction of the outer shell 1, ensuring that the central axes of the air inlet diverter net 21 and the outer shell 1 are coaxially aligned, avoiding asymmetrical diffusion of the mixed airflow due to installation eccentricity, and ensuring that the mixed airflow uniformly covers the cross section of the adsorption layer 3 in the circumferential direction.

[0075] As a preferred embodiment, as shown in the appendix Figure 1As shown, the end face of the outlet cap 161 facing the adsorption layer 3 is provided with an outlet end limiting ring 1611; along the axial direction of the outer shell 1, the two ends of the outlet diversion net 22 abut against the outlet end limiting ring 1611 and the outlet water absorption layer 42 respectively, which are used to limit the position of the outlet diversion net 22 along the axial direction of the outer shell 1, accurately control the axial distance between the outlet diversion net 22 and the outlet end of the adsorption layer 3, optimize the transition section length of the mixed airflow from the adsorption layer 3 to the diversion net 2, ensure that the mixed airflow converges smoothly in the diffusion state, and improve the uniformity of the outlet. The edge of the exhaust diversion mesh 22 is provided with an exhaust radial limiting ring 221. The exhaust radial limiting ring 221 abuts against the exhaust end limiting ring 1611 along the radial direction of the outer shell 1. It is used to limit the position of the exhaust diversion mesh 22 along the radial direction of the outer shell 1, ensuring that the exhaust diversion mesh 22 and the outer shell 1 are coaxially aligned. This avoids uneven airflow convergence due to assembly eccentricity, and ensures that the mixed airflow is smoothly concentrated towards the exhaust port 12 along the radial direction, thereby improving exhaust efficiency.

[0076] As a preferred embodiment, as shown in the appendix Figure 1 As shown, the breathing filter also includes an inlet filter layer 51 and an outlet filter layer 52. The inlet filter layer 51 is fixed between the inlet end cap 15 and the inlet diverter mesh 21, and is used to filter the mixed airflow flowing from the inlet port 11 to the inlet diverter mesh 21. The outlet filter layer 52 is fixed between the outlet end cap 161 and the outlet diverter mesh 22, and is used to filter the mixed airflow flowing from the outlet diverter mesh 22 to the outlet port 12. Both the inlet filter layer 51 and the outlet filter layer 52 are used to filter suspended particles such as dust and microorganisms carried in the mixed airflow, preventing them from entering the outer shell, clogging the mesh of the diverter mesh 2, and reducing the risk of particulate matter entering the patient's airway, thereby improving the reliability and safety of the breathing filter. (See attached image) Figure 9 As shown, both the inlet filter layer 51 and the outlet filter layer 52 include electrostatic cotton and breathable non-woven fabric fixed on both sides of the electrostatic cotton.

[0077] As attached Figure 1 As shown, the inlet end cap 15 has an inlet end fixing ring 154 protruding from the end face facing the adsorption layer 3, and the inlet diverter net 21 has an inlet support ring 212 protruding from the end face away from the adsorption layer 3. The inlet filter layer 51 is fixed between the inlet end fixing ring 154 and the inlet support ring 212. The outlet end cap 161 has an outlet end fixing ring 1612 protruding from the end face facing the adsorption layer 3, and the outlet diverter net 22 has an outlet support ring 222 protruding from the end face away from the adsorption layer 3. The outlet filter layer 52 is fixed between the outlet end fixing ring 1612 and the outlet support ring 222. The double-ring support structure can reliably fix the inlet filter layer 51 and keep the inlet filter layer 51 taut, avoiding local collapse of the filter material under the action of airflow, ensuring that the airflow passes through the filter layer evenly, and reducing the filtration dead angle caused by material relaxation.

[0078] As a preferred embodiment, as shown in the appendix Figure 10 and 11 As shown, the outer shell 1 and the portion opposite the adsorption layer 3 are provided with a viewing window 17. The viewing window 17 is provided with scale markings 18, which are used to display the adsorption state of the adsorption layer 3, specifically showing the color change of the adsorption layer 3 after adsorbing carbon dioxide. Specifically, from the air inlet to the air outlet, the adsorbent changes color layer by layer, and different values ​​representing different color changes are marked, such as 10%, 30%, 50%, and 90%. Of course, the color change of the adsorbent can also be indicated by units such as mL (volume unit).

[0079] When calcium hydroxide is used as the adsorbent, it is white when it is not adsorbing carbon dioxide, and eventually turns purple after it is saturated with carbon dioxide.

[0080] When sodium hydroxide is used as the adsorbent, it appears purple when it is not adsorbing carbon dioxide, and eventually turns white after it becomes saturated with carbon dioxide.

[0081] The working principle of the breathing filter provided by this invention is as follows:

[0082] The patient exhales a mixture of oxygen, carbon dioxide, and anesthetic gas, which flows into the air inlet and into the outer shell 1. The air inlet guide plate 151 guides the mixed airflow radially into the air inlet buffer chamber 13. After being filtered by the air inlet buffer chamber 13, it flows through the air inlet diverter 21. Guided by the air inlet diverter 21, it flows radially into the air inlet water absorption layer 41, where moisture is removed. Then it flows to the adsorption layer 3, where the adsorbent reacts chemically with carbon dioxide, removing it from the mixed airflow. The cleaned mixed airflow then flows to the outlet water absorption layer 42, passes through the outlet diverter 22, and is guided radially into the outer shell 1. It then flows through the outlet filter layer into the outlet buffer chamber, and finally, guided by the outlet guide, converges at the outlet and is discharged from the outlet, circulating back to the anesthesia machine inlet for the next respiratory cycle. The doctor clearly observes the effective remaining amount of adsorbent using the scale markings 18 on the outer shell 1 to determine if a new respiratory filter is needed.

[0083] The present invention also provides an anesthesia device, including the above-described breathing filter, which has the same beneficial effects.

[0084] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0085] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A breathing filter, characterized in that, include: The outer shell (1) has an air inlet (11) and an air outlet (12) at its two ends respectively. The outer shell (1) has an adsorption layer (3) for adsorbing carbon dioxide inside. Along the axial direction of the outer shell (1), the adsorption layer (3) is located between the air inlet (11) and the air outlet (12). At least one diversion net (2) is disposed between the adsorption layer (3) and the air inlet (11); when the mixed airflow flowing in from the air inlet (11) passes through the diversion net (2), the diversion net (2) is used to guide the mixed airflow to diffuse radially along the outer shell (1) and flow axially along the outer shell (1) through the adsorption layer (3) and then be discharged from the air outlet (12).

2. The breathing filter according to claim 1, characterized in that, The diversion mesh (2) is provided with a number of through diversion holes (201), and all the diversion holes (201) are arranged in a ring to surround the diversion section (202). The center of the diversion section (202) is provided with a guide section (203), which is used to guide the mixed airflow to flow radially along the outer shell (1) to the diversion section (202).

3. The breathing filter according to claim 2, characterized in that, Along the axial direction of the outer shell (1), the flow guide (203) protrudes away from the adsorption layer (3) to form a flow divider cone (204), which is used to guide the mixed airflow to flow radially along the outer shell (1).

4. The breathing filter according to claim 1, characterized in that, The outer casing (1) has an inlet buffer chamber (13) and an outlet buffer chamber (14) at its two ends, respectively. The inlet buffer chamber (13) is located between the inlet end of the adsorption layer (3) and the inlet port (11), and the outlet buffer chamber (14) is located between the outlet end of the adsorption layer (3) and the outlet port (12). The diversion net (2) includes: An air intake splitter (21) is fixed to the air intake buffer chamber (13). The air intake splitter (21) is used to guide the mixed airflow flowing through the air intake (11) to diffuse radially along the outer shell (1) to cover the air intake end of the adsorption layer (3). An exhaust gas diversion net (22) is fixed to the exhaust gas buffer chamber (14). The exhaust gas diversion net (22) is used to guide the mixed airflow flowing through the adsorption layer (3) to diffuse radially along the outer shell (1) to cover the exhaust end of the adsorption layer (3).

5. The breathing filter according to claim 4, characterized in that, The outer casing (1) includes: An air inlet end cap (15) is provided with an air inlet (11) with a central protrusion. The air inlet end cap (15) is fixed to a plurality of air inlet guide plates (151) on the side facing the adsorption layer (3). All the air inlet guide plates (151) are evenly distributed along the circumference of the outer shell (1). An air inlet guide groove (152) is formed between any two adjacent air inlet guide plates (151). The air inlet guide groove (152) is used to guide the mixed airflow through the air inlet (11) to flow radially along the outer shell (1) to the air inlet buffer cavity (13). The shell body (16) has an integrally provided air outlet end cap (161) at one end and an air inlet end cap (15) at the other end; the air outlet end cap (161) has a central protrusion with an air outlet (12); the air outlet end cap (161) is fixed to a plurality of air outlet guide plates (162) on the side facing the adsorption layer (3); all the air outlet guide plates (162) are evenly distributed along the circumference of the shell body (1); an air outlet guide groove (163) is formed between any two adjacent air outlet guide plates (162); the air outlet guide groove (163) is used to guide the mixed gas in the air outlet buffer chamber (14) to converge towards the air outlet (12) along the radial direction of the shell body (1).

6. The breathing filter according to claim 5, characterized in that, Also includes: The air intake water absorption layer (41) is fixed between the air intake end of the adsorption layer (3) and the air intake diversion net (21). The air intake water absorption layer (41) is used to absorb moisture in the mixed airflow from the air intake diversion net (21) to the adsorption layer (3). An air outlet water absorption layer (42) is fixed between the air outlet end of the adsorption layer (3) and the air outlet diversion net (22). The air outlet water absorption layer (42) is used to absorb moisture in the mixed airflow from the adsorption layer (3) to the air outlet diversion net (22).

7. The breathing filter according to claim 6, characterized in that, The air inlet end cap (15) has an air inlet end limiting ring (153) protruding from one end face facing the adsorption layer (3); along the axial direction of the outer shell (1), the two ends of the air inlet diversion net (21) abut against the air inlet end limiting ring (153) and the air inlet water absorption layer (41) respectively; the edge of the air inlet diversion net (21) has an air inlet radial limiting ring (211) protruding from it, and the air inlet radial limiting ring (211) abuts against the air inlet end limiting ring (153) along the radial direction of the outer shell (1); And / or, the end face of the vent cap (161) facing the adsorption layer (3) is provided with a vent end limiting ring (1611); along the axial direction of the outer shell (1), the two ends of the vent diversion net (22) abut against the vent end limiting ring (1611) and the vent water absorption layer (42) respectively; the edge of the vent diversion net (22) is provided with a vent radial limiting ring (221), and the vent radial limiting ring (221) abuts against the vent end limiting ring (1611) along the radial direction of the outer shell (1).

8. The breathing filter according to claim 5, characterized in that, Also includes: An intake filter layer (51) is fixed between the intake end cap (15) and the intake splitter mesh (21); The intake filter layer (51) is used to filter the mixed airflow from the intake port (11) to the intake splitting net (21); the intake end cap (15) has an intake end fixing ring (154) protruding on one end face facing the adsorption layer (3), and the intake splitting net (21) has an intake support ring (212) protruding on one end face away from the adsorption layer (3). The intake filter layer (51) is fixed between the intake end fixing ring (154) and the intake support ring (212). An exhaust filter layer (52) is fixed between the exhaust end cap (161) and the exhaust distribution net (22); the exhaust filter layer (52) is used to filter the mixed airflow from the exhaust distribution net (22) to the exhaust port (12); the exhaust end cap (161) has an exhaust end fixing ring (1612) protruding on one end face facing the adsorption layer (3), and the exhaust distribution net (22) has an exhaust support ring (222) protruding on one end face away from the adsorption layer (3), and the exhaust filter layer (52) is fixed between the exhaust end fixing ring (1612) and the exhaust support ring (222).

9. The breathing filter according to claim 1, characterized in that, The outer shell (1) is provided with a viewing window (17) on the part opposite to the adsorption layer (3). The viewing window (17) is provided with a scale mark (18) for displaying the adsorption state of the adsorption layer (3).

10. An anesthesia device, characterized in that, Includes the breathing filter as described in any one of claims 1 to 9.

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