Anesthesia conduit filter with independent inhalation and exhalation channels

Abstract

The present application relates to a kind of anesthetic pipeline filters of independent channel of inhalation and exhalation, including a gas inlet connector;And a gas outlet connector, the gas inlet connector and gas outlet connector are symmetrically arranged;And filter main body, filter main body is communicated and arranged between gas inlet connector and gas outlet connector, filter main body includes shell, and gas inlet connector and gas outlet connector are arranged at both ends of shell;And parallelly arranged in shell, gas inlet channel and gas outlet channel with built-in one-way valve, gas inlet connector, gas inlet channel and gas outlet connector are positively communicated by one-way valve, and gas outlet connector, gas outlet channel and gas inlet connector are reversely communicated by one-way valve;And filter disc, the filter disc is connected in shell, to filter the gas in gas inlet channel and gas outlet channel, and the minimum envelope circle diameter of gas inlet channel and gas outlet channel is less than the diameter of filter disc.The present application can make up the risk of inhalation resistance increase caused by filter membrane water vapor absorption of existing filter inhalation and exhalation same cavity.

Description

Technical Field

[0001] This invention relates to the field of respiratory filter technology, and more particularly to an anesthesia tubing filter with independent inhalation and exhalation channels. Background Technology

[0002] Currently, the commonly used anesthetic gas filters in clinical practice are disposable respiratory filters, which are disposable consumables in anesthesia medical care. They can be used and discarded by one person at a time, which can effectively reduce the mutual contamination between the breathing tubing and the patient. They also have a sampling port for monitoring carbon dioxide at the end of expiration.

[0003] One of the application scenarios for the aforementioned disposable respiratory filter is as follows: after the patient has been intubated, the filter is connected between the endotracheal tube and the breathing circuit (Y-tube) of the anesthesia machine. The patient receives respiratory support through the operation of the anesthesia machine, while the filter serves to keep the patient warm and moist, filter, and prevent infection.

[0004] However, in clinical use, disposable breathing filters present two clinical problems: 1. The filter material in the filter absorbs water vapor in the exhaled air. If the operation is long, water vapor may accumulate after the filter becomes saturated, affecting the oxygen supply and carbon dioxide discharge of the anesthesia machine to the patient.

[0005] 2. The end-tidal carbon dioxide sampling port is sealed with a separate cap. After unscrewing the cap, the carbon dioxide detection connector on the anesthesia machine can be connected to the sampling port for carbon dioxide detection. However, because there is no tie, the cap is easily lost after being removed, and it is easy to forget the cap after surgery, resulting in the carbon dioxide sampling port on the filter not being sealed, which may cause the risk of oxygen leakage to the patient and may also lead to serious consequences of hypoxia.

[0006] Moreover, existing disposable breathing filters are inspiratory and exhalation co-channel filters, meaning that inhaled and exhaled gases flow in the same space. After a long surgical period, the water vapor carried by the patient's exhaled gas is adsorbed by the filter, affecting the filter's permeability. This increases the resistance to oxygen entering the patient's airway and carbon dioxide exiting the patient's airway, thereby increasing the resistance to inhalation and exhalation and affecting the patient's smooth gas exchange. Summary of the Invention

[0007] To address the problem of gas exchange obstruction and increased respiratory resistance caused by decreased permeability of existing inspiratory-exhalation co-cavity filters during prolonged surgery due to water saturation of the filter material, this invention provides an anesthesia tubing filter with independent inspiratory and exhalation channels. This optimizes the existing co-cavity of inspiratory and exhalation filters into independent inspiratory and exhalation channels, preventing water absorption by the inspiratory filter membrane and reducing water vapor absorption by the expiratory filter membrane. It does not affect oxygen supply and carbon dioxide emission, while ensuring smooth inhalation and exhalation for the patient.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0009] An anesthesia tubing filter with independent inhalation and exhalation channels includes an air inlet connector; and,

[0010] An air outlet connector, wherein the air inlet connector and the air outlet connector are arranged symmetrically at intervals; and;

[0011] The filter body, which is connected between the air inlet and the air outlet, includes a housing with the air inlet and air outlet arranged at both ends; and,

[0012] An air inlet channel and an air outlet channel are arranged side-by-side within the housing and each contains a built-in one-way valve. The air inlet connector, the air inlet channel, and the air outlet connector are connected in the forward direction via the one-way valve, while the air outlet connector, the air outlet channel, and the air inlet connector are connected in the reverse direction via the one-way valve, thus restricting the airflow directions within the two channels to be opposite.

[0013] A filter disc, which is connected inside the housing, is used to filter the gas in the inlet and outlet channels and to provide at least two filtrations for each channel. The minimum envelope circle diameter of the inlet and outlet channels is smaller than the diameter of the filter disc.

[0014] Furthermore, the air intake connector is a stepped tubular shape, comprising a small-diameter section and a large-diameter section, with a conical transition between the two sections. The diameter of the small-diameter section is smaller than that of the large-diameter section, and the length of the small-diameter section is greater than that of the large-diameter section. The large-diameter section facilitates connection and installation with the outer casing.

[0015] Furthermore, the exhaust connector and the intake connector have the same structure, and the large-diameter sections of the exhaust connector and the intake connector are detachably connected to the two ends of the outer casing, respectively. This facilitates the assembly and disassembly of the intake connector, the exhaust connector, and the outer casing.

[0016] Furthermore, the air inlet connector is equipped with a sampling unit for use in conjunction with the carbon dioxide detection connector on the anesthesia machine for sampling. The two ends of the sampling unit extend to the inside and outside of the air inlet connector, respectively.

[0017] Furthermore, the sampling unit includes a fixed sleeve, an inner core, and a compression spring. The fixed sleeve is connected and fixed to the side wall of the air intake connector, and the fixed sleeve penetrates the side wall of the air intake connector.

[0018] The inner core, a tube closed at one end, is elastically slidably connected to the fixed sleeve via a compression spring. The closed end of the inner core extends into the air inlet connector, and an air hole is provided at the closed end. When the inner core retracts into the fixed sleeve, the air hole is blocked and sealed by the fixed sleeve. The sampling unit is only opened when the carbon dioxide detection connector on the anesthesia machine is engaged.

[0019] Furthermore, the outer shell is a cylindrical body with closed ends. The outer shell includes a circular shell and a plug. The circular plugs are provided at both ends of the circular shell. The distance between the two plugs is less than the length of the circular shell, so as to leave an installation margin at the end of the circular shell for connection with the air inlet connector and the air outlet connector.

[0020] Furthermore, both the air inlet and outlet channels are circular tube structures, symmetrically arranged on the end caps, and both channels penetrate between the two end caps. This facilitates support of the two channels by the end caps.

[0021] Furthermore, the filter disc is disc-shaped, and the filter disc and the outer shell are arranged coaxially. The filter disc divides the outer shell into independent long sections and short sections. Each long section and short section is composed of a circular shell, a plug, an air inlet channel, and an air outlet channel.

[0022] The long and short sections work together to clamp the filter disc. A connecting shaft is provided between the centers of the long and short sections' caps to facilitate connecting and fixing the left and right sections. The filter disc is sleeved on the connecting shaft and rotates relative to it. A rotating ring is fixedly sleeved on the edge of the filter disc, extending to the outer wall of the cylindrical shell. The rotating ring facilitates control of the filter disc's rotation.

[0023] Furthermore, the filter disc includes a filter screen frame, a hydrophobic filter membrane, and a water-absorbing filter material. The filter screen frame is a circular frame with an "H"-shaped cross-section made of filter screen, and the water-blocking filter membrane and water-absorbing filter material are disposed within the filter screen frame. It can not only filter gases but also absorb water vapor and intercept moisture.

[0024] The beneficial effects of the present invention through the above technical solution are:

[0025] This invention features a rational structural design, optimizing the conventional shared inhalation and exhalation channel design of filters into an independent inhalation and exhalation tubing design, namely, an inlet channel and an outlet channel. A one-way valve within each channel controls the flow of gas. Ultimately, the patient's inhaled gas flows along the inlet connector, inlet channel, and outlet connector, while exhaled gas flows along the outlet connector, outlet channel, and inlet connector. This ensures that the two airflows do not meet in the same space, each having its own flow path, guaranteeing smooth exchange of inhaled and exhaled gases and resolving the resistance issue in oxygen supply to the patient from anesthesia machines.

[0026] The filter disc of this invention is rotatably mounted inside the outer casing, dividing the filter body into independent left and right sections. Airflow in the intake channel first passes through a one-way valve and then through the filter disc, filtering the inhaled gas. Airflow in the exhaust channel first passes through the filter disc and then through the one-way valve, filtering the exhaled gas, especially absorbing water vapor in the exhaled gas to prevent moisture buildup in the exhaust channel. Furthermore, because the filter disc can rotate, once the current area of ​​the filter disc is saturated with water vapor, it can rotate to another area of ​​the filter disc to re-absorb water vapor, reducing the resistance to carbon dioxide emissions caused by saturated water vapor adsorption.

[0027] The sampling unit of this invention has an elastically sliding inner core structure. Only when the carbon dioxide detection connector on the anesthesia machine is connected to the fixing sleeve will the inner core move, thereby connecting the air vent with the air inlet connector, opening the sampling unit, and allowing carbon dioxide gas to enter the detection connector. If the detection structure is not connected to the fixing sleeve, the sampling unit is in a closed state. Simultaneously, a cap is used to seal one end of the sampling unit. The cap is connected to the air inlet connector via a tie to prevent loss of the cap and also solves the problem of potential hazards caused by negligence in sealing the carbon dioxide sampling port. Attached Figure Description

[0028] Figure 1 This is a front view of an anesthesia tubing filter with an independent inhalation and exhalation channel according to the present invention.

[0029] Figure 2 This is a cross-sectional view of an anesthesia tubing filter with an independent inhalation and exhalation channel according to the present invention.

[0030] Figure 3 This is a schematic diagram showing the overall disassembled structure of an anesthesia tubing filter with an independent inhalation and exhalation channel according to the present invention.

[0031] Figure 4 This is a schematic diagram of the symmetrical arrangement of the inlet and outlet channels of an anesthesia tubing filter with independent inhalation and exhalation channels according to the present invention. In the figure, A represents the dotted line and is the smallest envelope circle of the inlet and outlet channels.

[0032] Figure 5 This is a schematic diagram showing the disassembled filter body of an anesthesia tubing filter with an independent inhalation and exhalation channel according to the present invention.

[0033] Figure 6 This is a schematic diagram of the installation of the fixing cap of an anesthesia tubing filter with an independent inhalation and exhalation channel according to the present invention.

[0034] Figure 7 This is a cross-sectional view of the filter disc of an anesthesia tubing filter with an independent inhalation and exhalation channel according to the present invention.

[0035] Figure 8 This invention relates to an anesthesia tubing filter with an independent inhalation and exhalation channel. Figure 6 A magnified schematic diagram of the rotating ring at point A.

[0036] Figure 9 This is a diagram showing the correspondence between the air inlet and outlet channels and the filter plate of an anesthesia tubing filter with an independent inhalation and exhalation channel according to the present invention. In the diagram, B represents two dotted lines that divide the filter plate into four regions.

[0037] Figure 10 This is one of the schematic diagrams of the sampling unit of an anesthesia tubing filter with an independent inhalation and exhalation channel according to the present invention. The inner core in the diagram is in a retracted state.

[0038] Figure 11 This is the second schematic diagram of the sampling unit of an anesthesia tubing filter with an independent inhalation and exhalation channel according to the present invention. The inner core in the diagram is in an extended state.

[0039] Figure 12 This is a schematic diagram of the airbag distribution of an anesthesia tubing filter with an independent inhalation and exhalation channel according to the present invention.

[0040] The numbers in the attached diagram are: 1. Inlet connector, 101. Small diameter section, 102. Large diameter section, 2. Outlet connector, 3. Filter body;

[0041] 4. Outer shell, 401 long section, 402 short section, 41 round shell, 42 plug, 5 air inlet channel, 6 air outlet channel, 7 one-way valve;

[0042] 8 Filter disc, 81 Filter screen frame, 811 Inner ring, 812 Mesh plate, 82 Hydrophobic filter membrane, 83 Water-absorbing filter media, 831 Filter flat tube, 832 Desiccant, 9 Connecting shaft, 10 Fixing cap, 11 Fixing bolt, 12 Rotating ring;

[0043] 13 Sampling unit, 131 Fixing sleeve, 132 Inner core, 133 Compression spring, 134 Retaining ring, 135 Air hole, 136 Tie, 137 Cap, 14 Airbag one, 15 Airbag two, 16 Plug cap. Detailed Implementation

[0044] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings:

[0045] like Figures 1-12 As shown, an anesthesia tubing filter with an independent inhalation and exhalation channel includes an inlet connector 1, an outlet connector 2, and a filter body 3, as shown. Figure 1 and Figure 2As shown in the diagram, the air inlet connector 1 and the air outlet connector 2 are arranged symmetrically at intervals, and the filter body 3 is connected and disposed between the air inlet connector 1 and the air outlet connector 2. The anesthesia tubing filter is connected to the breathing circuit of the anesthesia machine, i.e., the Y-shaped tube, through the air inlet connector 1, and to the endotracheal tube through the air outlet connector 2. Since the filter body 3 is connected between the two, the entire anesthesia tubing filter has basic pipeline connection and filtration functions.

[0046] The intake connector 1 is a stepped tubular shape, comprising a small-diameter section 101 and a large-diameter section 102, with a conical transition between them. The diameter of the small-diameter section 101 is smaller than that of the large-diameter section 102, and the length of the small-diameter section 101 is greater than that of the large-diameter section 102. The entire intake connector 1 is larger at one end and smaller at the other. The small-diameter section 101 is connected to the Y-shaped pipe, and the large-diameter section 102 is connected to the filter body 3.

[0047] The air outlet connector 2 and the air inlet connector 1 have the same structure and dimensions. The small-diameter section 101 of the air outlet connector 2 connects to the air tube, and the large-diameter section 102 connects to the filter body 3. Furthermore, the large-diameter sections 102 of both the air outlet connector 2 and the air inlet connector 1 are detachably connected to both ends of the filter body. Therefore, during manufacturing, the air outlet connector 2, the air inlet connector 1, and the filter body can be three independent components, such as... Figure 3 As shown.

[0048] The filter body 3 includes a housing 4, an air inlet channel 5, and an air outlet channel 6. The housing 4 is a cylindrical body with closed ends. The housing 4 includes a circular shell 41 and a plug 42. Circular plugs 42 are provided at both ends of the circular shell 41, so the internal space of the housing 4 is closed.

[0049] An air inlet connector 1 and an air outlet connector 2 are arranged at both ends of the outer casing 4, meaning that both the air inlet connector 1 and the air outlet connector 2 are detachably connected to the outer casing 4. Specifically, the distance between the two plugs 42 is limited to less than the length of the circular shell 41, thus allowing for installation slack at the end of the circular shell 41, enabling threaded connections with the air inlet connector 1 and the air outlet connector 2. That is, the large-diameter section 102 of the air inlet connector 1 and the large-diameter section 102 of the air outlet connector 2 are threadedly connected and fixed to the end of the circular shell 41.

[0050] The intake channel 5 and the exhaust channel 6 are arranged side by side inside the outer casing 4. Both the intake channel 5 and the exhaust channel 6 are circular tubes with the same length and diameter. Figure 4 As shown, the air intake channel 5 and the air outlet channel 6 are symmetrically arranged on the cover 42, and both the air intake channel 5 and the air outlet channel 6 are connected through the two covers 42, with the two covers 42 supporting both the air intake channel 5 and the air outlet channel 6. At this time, the air intake connector 1 and the air outlet connector 2 are connected to the air outlet channel 6 through the air intake channel 5.

[0051] Both the inlet channel 5 and the outlet channel 6 are equipped with one-way valves 7, which are located near the inlet connector 1. The one-way valves 7 can be either duckbill valves or breathing valves commonly used on masks, but they are installed in opposite directions in the inlet and outlet channels 5 and 6. Therefore, the inlet connector 1, inlet channel 5, and outlet connector 2 are connected in the forward direction via the one-way valves 7, and the inlet connector 1, outlet channel 6, and outlet connector 2 are connected in the reverse direction via the one-way valves 7. In short, the gas flow directions in the inlet channel 5 and outlet channel 6 are opposite; the inlet channel 5 is used for inhaled air, and the outlet channel 6 is used for exhaled air.

[0052] The filter body 3 also includes a filter disc 8, which is disc-shaped. The minimum envelope circle diameter of the air inlet channel 5 and the air outlet channel 6 is smaller than the diameter of the filter disc 8. The filter disc 8 is connected inside the outer shell 4, and the filter disc 8 and the outer shell 4 are arranged coaxially. The filter disc 8 is close to the air outlet connector 2. The filter disc 8 can filter the gas in the air inlet channel 5 and the air outlet channel 6, enabling the anesthesia tubing filter to achieve basic filtration function.

[0053] Due to the presence of the filter disc 8, the outer casing 4 is divided into two independent long sections 401 and short sections 402. That is, by longitudinally cutting the entire outer casing 4 with the installation position of the filter disc 8 as the boundary, two parts of different lengths are formed: long section 401 and short section 402. Long section 401 is longer than short section 402. Both long section 401 and short section 402 are composed of a circular shell 41, a plug 42, an air inlet channel 5, and an air outlet channel 6. Figure 5 As shown. The components contained in the long segment 401 and the short segment 402 are all made of medical-grade PC material.

[0054] Since the long section 401 and the short section 402 are independent of each other, a connecting shaft 9 is provided between the center of the plug 42 of the long section 401 and the short section 402 during installation. The end of the connecting shaft 9 is polygonal, and a polygonal hole is also opened in the center of the plug 42. The end of the connecting shaft 9 is inserted into the center of the plug 42 and fits tightly with the plug 42 to achieve fixation.

[0055] The filter disc 8 is mounted on the connecting shaft 9 and rotates relative to the connecting shaft 9, so that different positions of the filter disc 8 can correspond to the air inlet channel 5 and the air outlet channel 6 respectively. The long section 401 and the short section 402 cooperate to clamp the filter disc 8. Therefore, the filter disc 8 is arranged between the air inlet channel 5 of the long section 401 and the short section 402, and the filter disc 8 is also arranged between the air outlet channel 6 of the long section 401 and the short section 402. Using one filter disc 8, the gas in the air inlet channel 5 and the air outlet channel 6 can be filtered simultaneously.

[0056] Since the long section 401 and the short section 402 are separate parts, in order to optimize the product structure and ensure the reliability of their connection and fixation via the connecting shaft 9, a fixing cap 10 is provided at the center of the plug 42. The fixing cap 10 is a U-shaped annular body. The end of the connecting shaft 9 passes through the center of the plug 42 and is inserted into the fixing cap 10. Simultaneously, a plastic fixing bolt 11 is inserted through the center of the fixing cap 10. The fixing bolt 11 extends into the fixing cap 10 and is threadedly connected to the end of the connecting shaft 9. The end of the connecting shaft 9 has a threaded hole, the length of which is greater than the length of the fixing bolt 11. Figure 6 As shown.

[0057] According to the above structure, the fixing cap 10 and fixing bolt 11 are arranged at the center of the plug 42 of the long section 401 and the short section 402. After tightening the fixing bolt 11, the head of the fixing bolt 11 presses against the fixing cap 10, and then the two fixing caps 10, as well as the long section 401 and the short section 402 where the fixing caps 10 are located, move closer to each other, applying a certain clamping force to the filter disc 8. At the same time, the connection between the long section 401 and the short section 402 is also more reliable.

[0058] In this embodiment, the filter disc 8 includes a filter screen frame 81, a hydrophobic filter membrane 82, and a water-absorbing filter material 83, such as Figure 7 As shown. The filter frame 81 is a circular frame with an "H"-shaped cross-section made of filter screen. The filter frame 81 includes an inner ring 811 and a screen plate 812. The inner ring 811 is sleeved on the connecting shaft 9 and rotatably connected to the connecting shaft 9. The screen plates 812 are fixedly installed at both ends of the inner ring 811 in the axial direction. The screen plate 812 is a ring body. After the two screen plates 812 and the inner ring 811 are connected and combined, the cross-section is "H". There is an annular filter cavity between the two screen plates 812.

[0059] A water-blocking filter membrane and a water-absorbing filter material 83 are arranged inside the filter frame 81, and both the water-blocking filter membrane and the water-absorbing filter material 83 are arranged inside the filter cavity. The water-blocking filter membrane is a thin, circular ring that is attached to the mesh plate 812 at one end. The water-blocking filter membrane is a waterproof and breathable microporous filter membrane that can block liquid water from passing through.

[0060] The water-absorbing filter material 83 is attached between the water-blocking filter membrane and the mesh plate 812 at the other end. Along the direction of exhaled gas flow in the air outlet channel 6, the water-absorbing filter material 83 and the water-blocking filter membrane are arranged in sequence. The water-absorbing filter material 83 first absorbs the water vapor contained in the exhaled gas, and then it is filtered by the water-blocking filter membrane.

[0061] The absorbent filter material 83 includes a filter flat tube 831 and a desiccant 832. The filter flat tube 831 is made of PP non-woven fabric and has a certain length. Both ends of the filter flat tube 831 are closed. The filter flat tube 831 is filled with desiccant 832, which is medical-grade silica gel desiccant. After the filter flat tube 831 is evenly filled with desiccant 832, one end of the filter flat tube 831 is pressed tightly against the inner ring 811 and then wound around it. Gradually, the filter flat tube 831 is wound around the filter frame 81. The diameter of the filter flat tube 831 increases with each winding. Finally, the filter flat tube 831 is evenly wound together in a mosquito coil shape and is located in the annular filter cavity.

[0062] Since the filter disc 8 is connected inside the outer shell 4, a manual method is used to achieve the rotation of the filter disc 8. Specifically, a rotating ring 12 is provided on the edge fixing sleeve 131 of the filter disc 8. The rotating ring 12 is a circular ring formed by bending a long strip with an "I"-shaped cross-section. The rotating ring 12 extends to the outer wall of the circular shell 41. After the rotating ring 12 is connected and fixed to the filter disc 8, the rotation of the filter disc 8 inside the outer shell 4 can be controlled by operating the rotating ring 12 from outside the outer shell 4. Figure 8 As shown.

[0063] Here, the circular filter disc 8 is evenly divided into two parts, each part being a semi-circular structure. The two parts of the filter disc 8 are used for filtration in the air inlet channel 5 and the air outlet channel 6, respectively. Figure 9 As shown. The intake channel 5 and the exhaust channel 6 each correspond to half of the area of ​​each part. That is, the intake channel 5 and the exhaust channel 6 are filtered by the quarter filter disc 8. Thus, the entire filter disc 8 can provide two filtrations for the intake channel 5 and can also provide two filtrations for the exhaust channel 6 at the same time.

[0064] The principle of this invention is as follows: After the anesthesia tubing filter is correctly installed and connected to the breathing circuit and endotracheal tube of the anesthesia machine, during the operation, the oxygen inhaled by the patient flows along the inlet connector 1, the inlet channel 5 and the outlet connector 2 and is finally inhaled by the patient; the gas exhaled by the patient flows along the outlet connector 2, the outlet channel 6 and the inlet connector 1 and is finally processed by the anesthesia machine.

[0065] During this process, inhaled and exhaled gases flow in the inlet channel 5 and outlet channel 6 respectively, thus forming two independent channels for inhalation and exhalation to avoid affecting gas exchange. Simultaneously, inhaled gas is filtered by the filter plate 8 before being inhaled, and exhaled gas is also filtered by the filter plate 8 before being processed by the anesthesia machine. In particular, exhaled gas first passes through the water-absorbing filter material 83, which absorbs the water vapor contained in the exhaled gas, and the water-blocking filter membrane intercepts moisture, preventing liquid water from passing through. This prevents water from being generated in the outlet channel 6.

[0066] If the surgery takes a long time, once the area of ​​the filter disc 8 corresponding to the outlet channel 6 becomes saturated, to avoid affecting the filtration permeability, the filter disc 8 can be manually rotated to align the outlet channel 6 with another area of ​​the filter disc 8. The filter disc 8 in the current area can then resume gas filtration and water vapor absorption. At the same time, the area of ​​the filter disc 8 corresponding to the inlet channel 5 is also changed, allowing for the re-filtration of the inhaled gas.

[0067] Because this invention features independent inlet and outlet channels 5 and 6, inhaled and exhaled gases flow along their respective channels, avoiding convection. Therefore, the resistance to oxygen entering the patient's airway and the resistance to carbon dioxide exiting the patient's airway do not increase, thus preventing any disruption to the smooth exchange of inhaled and exhaled gases. The filter disc 8 can process water vapor carried by the patient's exhaled gas at least twice, preventing any impact on the filter disc 8's permeability.

[0068] In order to sample exhaled gas, a sampling unit 13 is provided on the air inlet connector 1. The sampling unit 13 is similar to an interface, which is used to cooperate with the carbon dioxide detection connector on the anesthesia machine to achieve sampling. Therefore, the entire anesthesia pipeline filter has a carbon dioxide monitoring function.

[0069] Sampling unit 13 is installed on the small-diameter section 101 of air intake connector 1. Sampling unit 13 includes a fixing sleeve 131, an inner core 132, and a compression spring 133, such as Figure 10 and Figure 11 As shown. The fixing sleeve 131 is connected and fixed to the side wall of the air intake connector 1. The fixing sleeve 131 penetrates the side wall of the air intake connector 1, and thus both ends of the fixing sleeve 131 of the sampling unit 13 extend to the inside and outside of the air intake connector 1, respectively, connecting the inside and outside of the air intake connector 1. The fixing sleeve 131 located outside the air intake connector 1 is longer, and the fixing sleeve 131 located inside the air intake connector 1 is shorter. Moreover, the outer side wall of the fixing sleeve 131 located outside the air intake connector 1 has external threads.

[0070] An inner core 132 is elastically slidably connected to the fixing sleeve 131 via a compression spring 133. Both the inner core 132 and the fixing sleeve 131 are made of medical-grade PC material. The inner core 132 is a tube closed at one end, and its cross-section is "T"-shaped. During installation, the inner cavity of the fixing sleeve 131 is designed in a stepped shape, with a smaller diameter at the end of the fixing sleeve 131 extending into the air inlet connector 1 and a larger diameter at the end extending out of the air inlet connector 1. The inner core 132 is inserted from the smaller end of the inner cavity of the fixing sleeve 131. Because the cross-section of the inner core 132 is "T"-shaped, the wider end of the inner core 132 is larger than the smaller diameter of the inner cavity of the fixing sleeve 131. Therefore, the wider end of the inner core 132 abuts against one end of the fixing sleeve 131, which limits the insertion depth of the inner core 132.

[0071] A retaining ring 134 is provided at the narrow end of the inner core 132. The retaining ring 134 slides along the large inner cavity of the fixing sleeve 131. A compression spring 133 is sleeved on the inner core 132. The two ends of the compression spring 133 abut against the retaining ring 134 and the stepped change point of the inner cavity of the fixing sleeve 131, respectively. Under the action of the compression spring 133, the entire inner core 132 tends to extend into the fixing sleeve 131.

[0072] It is important to note that the closed end, i.e., the wide end, of the inner core 132 extends into the air inlet connector 1. Four air holes 135 are evenly distributed on the side wall of the closed end of the inner core 132. When the inner core 132 retracts into the fixing sleeve 131, the air holes 135 are blocked and sealed by the fixing sleeve 131, and the air holes 135 are not connected to the air inlet connector 1. When the carbon dioxide detection connector on the anesthesia machine is connected to the fixing sleeve 131, the detection connector will push the inner core 132 out. During the outward extension, the compression spring 133 is continuously compressed until the fixing sleeve 131 no longer blocks the air holes 135. At this point, the air holes 135 are connected to the air inlet connector 1. The air holes 135, the inner core 132, and the detection connector form an airflow channel, allowing exhaled gas to enter the detection connector and be monitored by the anesthesia machine. After unscrewing the detection connector, there is no external force pushing the inner core 132, and under the action of the compression spring 133, the inner core 132 returns to its original position, and the air holes 135 are blocked.

[0073] Since the narrow end, or open end, of the inner core 132 is always exposed, a cap 137 is fastened to the end of the fixing sleeve 131 to simultaneously cover one end of the fixing sleeve 131 and the narrow end of the inner core 132. The cap 137 is a plug-in connection. To prevent the cap 137 from being lost, it is connected to the air intake connector 1 via a strap 136. This is equivalent to using the strap 136 to secure the cap 137. The strap 136 is a plastic strap that serves as a connection and can be bent arbitrarily.

[0074] Since the anesthesia tubing filter is located near the patient's head and face after installation, in order to optimize the product structure and avoid the filter pressing on the patient's head and face and causing indentations or even trauma, a flexible tube can be added between the air outlet connector 2 and the endotracheal tube to increase the distance between the air outlet connector 2 and the endotracheal tube. This will keep the anesthesia tubing filter away from the patient's head and face.

[0075] An airbag can also be placed over the surface of the anesthesia tubing filter to separate the patient's head and face from the filter, achieving the desired effect. Specifically, the outer wall of the cylindrical shell 41 of the long section 401 is covered with an airbag 14, which extends to the stepped change at the air inlet connector 1. The outer wall of the cylindrical shell 41 of the short section 402 is covered with an airbag 2 15, which extends to the stepped change at the air outlet connector 2.

[0076] Airbag 14 and Airbag 25 have the same structure but different lengths. Both airbag 14 and Airbag 25 have interfaces with caps 16. When the caps 16 are screwed on, the interfaces are closed; when the caps 16 are screwed off, the interfaces are opened. Initially, airbag 14 and Airbag 2 are deflated and under negative pressure. When the caps 16 are screwed off, air enters, and airbag 14 and Airbag 2 inflate. Then, the caps 16 are screwed back on, and airbag 14 and Airbag 2 are filled with air. Thus, the entire protruding part of the filter is covered by a flexible airbag, allowing for flexible contact with the patient's head and face, avoiding pressure marks or even trauma to the patient's head and face.

[0077] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present invention should be included within the scope of the present invention.

Claims

1. A filter for an anesthesia tubing with independent inhalation and exhalation channels, characterized in that, Includes an air intake connector (1); and, An air outlet connector (2), wherein the air inlet connector (1) and the air outlet connector (2) are arranged symmetrically at intervals; and; A filter body (3) is connected between an air inlet connector (1) and an air outlet connector (2). The filter body (3) includes a housing (4), with an air inlet connector (1) and an air outlet connector (2) arranged at both ends of the housing (4). An air inlet channel (5) and an air outlet channel (6) are arranged side-by-side inside the outer casing (4) and each has a built-in one-way valve (7). The air inlet connector (1), the air inlet channel (5), and the air outlet connector (2) are connected in the forward direction via the one-way valve (7), and the air outlet connector (2), the air outlet channel (6), and the air inlet connector (1) are connected in the reverse direction via the one-way valve (7). The filter disc (8) is connected inside the housing (4) to filter the gas in the inlet channel (5) and the outlet channel (6), the minimum envelope circle diameter of the inlet channel (5) and the outlet channel (6) being smaller than the diameter of the filter disc (8).

2. The anesthesia tubing filter with an independent inhalation and exhalation channel according to claim 1, characterized in that, The air intake connector (1) is a stepped tubular shape, and the air intake connector (1) includes a small diameter section (101) and a large diameter section (102). The small diameter section (101) and the large diameter section (102) are conically transitioned. The diameter of the small diameter section (101) is smaller than the diameter of the large diameter section (102), and the length of the small diameter section (101) is greater than the length of the large diameter section (102).

3. The anesthesia tubing filter with an independent inhalation and exhalation channel according to claim 2, characterized in that, The air outlet connector (2) and the air inlet connector (1) have the same structure. The large diameter section (102) of the air outlet connector (2) and the large diameter section (102) of the air inlet connector (1) are detachably connected to the two ends of the outer shell (4).

4. The anesthesia tubing filter with an independent inhalation and exhalation channel according to claim 1, characterized in that, The air inlet connector (1) is provided with a sampling unit (13) for use in conjunction with the carbon dioxide detection connector on the anesthesia machine for sampling. The two ends of the sampling unit (13) extend to the inside and outside of the air inlet connector (1), respectively.

5. The anesthesia tubing filter with an independent inhalation and exhalation channel according to claim 4, characterized in that, The sampling unit (13) includes a fixed sleeve (131), an inner core (132) and a compression spring (133). The fixed sleeve (131) is connected and fixed to the side wall of the air inlet connector (1), and the fixed sleeve (131) penetrates the side wall of the air inlet connector (1). The inner core (132) is elastically slidably connected to the fixed sleeve (131) via the compression spring (133). The inner core (132) is a tube with one end closed. The closed end of the inner core (132) extends into the air inlet connector (1). The closed end of the inner core (132) has an air hole (135). When the inner core (132) retracts into the fixed sleeve (131), the air hole (135) is blocked and closed by the fixed sleeve (131).

6. The anesthesia tubing filter with an independent inhalation and exhalation channel according to claim 1, characterized in that, The outer shell (4) is a cylindrical body with closed ends. The outer shell (4) includes a circular shell (41) and a plug (42). The circular plug (42) is provided at both ends of the circular shell (41). The distance between the two plugs (42) is less than the length of the circular shell (41) so that there is an installation margin at the end of the circular shell (41) for connection with the air inlet connector (1) and the air outlet connector (2).

7. The anesthesia tubing filter with an independent inhalation and exhalation channel according to claim 6, characterized in that, The air intake channel (5) and the air outlet channel (6) are both circular tube structures. The air intake channel (5) and the air outlet channel (6) are symmetrically arranged on the plug (42), and the air intake channel (5) and the air outlet channel (6) are both installed between the two plugs (42).

8. The anesthesia tubing filter with an independent inhalation and exhalation channel according to claim 6, characterized in that, The filter disc (8) is disc-shaped and is coaxially arranged with the outer shell (4). The filter disc (8) divides the outer shell (4) into a long section (401) and a short section (402) that are independent of each other. The long section (401) and the short section (402) are both composed of a round shell (41), a plug (42), an air inlet channel (5), and an air outlet channel (6). The long section (401) and the short section (402) cooperate to clamp the filter disc (8). A connecting shaft (9) is provided between the center of the plug (42) of the long section (401) and the short section (402). The filter disc (8) is sleeved on the connecting shaft (9) and rotates relative to the connecting shaft (9). The edge fixing sleeve (131) of the filter disc (8) is provided with a rotating ring (12), which extends to the outer wall of the round shell (41).

9. The anesthesia tubing filter with an independent inhalation and exhalation channel according to claim 8, characterized in that, The outer wall of the round shell (41) of the long section (401) is covered with an airbag one (14), which extends to the air inlet connector (1). The outer wall of the round shell (41) of the short section (402) is covered with an airbag two (15), which extends to the air outlet connector (2).

10. The anesthesia tubing filter with an independent inhalation and exhalation channel according to claim 1, characterized in that, The filter disc (8) includes a filter screen frame (81), a hydrophobic filter membrane (82), and a water-absorbing filter material (83). The filter screen frame (81) is a circular frame with an "H" shaped cross-section made of filter screen. The water-blocking filter membrane and the water-absorbing filter material (83) are arranged inside the filter screen frame (81).

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