Bronchus one-way valve

Abstract

The utility model relates to a bronchus one-way valve which is used for at least solving the problem that an existing duckbilled one-way valve is prone to causing secretion retention. The bronchus one-way valve comprises a first branch membrane assembly and a second branch membrane assembly located in the first branch membrane assembly. A fluid channel is defined by the inner side wall of the first branch membrane assembly and the outer side wall of the second branch membrane assembly, and the second branch membrane assembly is configured to at least open or close the fluid channel according to the flowing direction of fluid in the branch air pipe.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a bronchial one-way valve. Background Art

[0002] Chronic obstructive pulmonary disease is the first chronic respiratory disease in China, which is characterized by high incidence and high mortality. Patients with severe emphysema phenotype of chronic obstructive pulmonary disease are insensitive to drug treatment. Therefore, lung volume reduction surgery and lung transplantation have become important treatment measures for such patients. Bronchoscopic lung volume reduction surgery has been recommended by international guidelines for use in such patients. In addition, bronchopleural fistula is a disease that seriously affects the quality of life and prognosis of patients. The application of one-way valve occlusion technology is one of the main clinical treatment options.

[0003] At present, most of the bronchial one-way valves used clinically adopt duckbill-shaped one-way valves. However, the duckbill-shaped one-way valves have a small opening, which easily leads to the retention of secretions, resulting in blockage. In more serious cases, it may even lead to obstructive pneumonia and aggravate the patient's condition. Summary of the Utility Model

[0004] In view of the above analysis, the utility model aims to provide a bronchial one-way valve to at least solve the problem that the existing duckbill-shaped one-way valve is prone to secretion retention.

[0005] The purpose of the utility model is mainly achieved through the following technical solutions:

[0006] The utility model provides a bronchial one-way valve, which includes a first branch membrane assembly and a second branch membrane assembly located inside the first branch membrane assembly;

[0007] A fluid channel is defined by the inner side wall of the first branch membrane assembly and the outer side wall of the second branch membrane assembly. The second branch membrane assembly is configured to open or close the fluid channel at least according to the flow direction of the fluid in the bronchus.

[0008] Further, the second branch membrane assembly includes a first state and a second state. The flow direction of the fluid includes an intake direction and an exhaust direction;

[0009] When the flow direction is the intake direction, the second branch membrane assembly is in the first state, and the fluid channel is closed;

[0010] When the flow direction is the exhaust direction, the second branch membrane assembly is in the second state, and the fluid channel is opened;

[0011] Preferably, the second branch membrane assembly is configured to be connected to the first branch membrane assembly at least by an assembly method, so that the second branch membrane assembly can be assembled inside the first branch membrane assembly.

[0012] Furthermore, the structure of the second branch membrane assembly is an expandable and contractible structure, and the second branch membrane assembly is configured to be able to expand or contract at least according to the flow direction;

[0013] The first state is the expanded state, and the second state is the contracted state;

[0014] Preferably, in the expanded state, at least a part of the outer sidewall of the second branch membrane assembly is hermetically attached to the inner sidewall of the first branch membrane assembly, and the attached part can be connected end to end to close the fluid channel;

[0015] In the contracted state, there is a gap between at least a part of the outer sidewall of the second branch membrane assembly and the inner sidewall of the first branch membrane assembly, and the gap part can at least extend from the front end to the rear end of the outer sidewall of the second branch membrane assembly to open the fluid channel;

[0016] Preferably, in the expanded state, the rear end of the outer sidewall of the second branch membrane assembly is hermetically attached to the inner sidewall of the first branch membrane assembly, or / and the rear end of the inner sidewall of the first branch membrane assembly is hermetically attached to the outer sidewall of the second branch membrane assembly;

[0017] In the contracted state, any point on the outer sidewall of the second branch membrane assembly is not attached to the inner sidewall of the first branch membrane assembly;

[0018] Preferably, the second branch membrane assembly expands or contracts under the action of the fluid in the bronchus.

[0019] Furthermore, the first branch membrane assembly is provided with a first cavity that is open at both the front and rear ends, and the second branch membrane assembly is mounted in the first cavity;

[0020] The second branch membrane assembly is provided with a second cavity that is open at the rear end, and the shape of the second cavity is gradually expanding from front to back.

[0021] Furthermore, the first branch membrane assembly includes a first support frame and a first film;

[0022] The first support frame includes an annular wall support and an assembly frame, and the assembly frame is connected to the annular wall support for assembling the second branch membrane assembly;

[0023] The annular wall support cooperates with the first film, and the first film is laid on the inner sidewall of the annular wall support.

[0024] Furthermore, the second branch membrane assembly includes a second support frame and a second film;

[0025] The second support frame includes a fixed frame and a telescopic frame which are connected. The fixed frame is connected to the assembly frame to mount the second film component in the first cavity.

[0026] The telescopic frame cooperates with the second film. The second film is laid on the outer side wall of the telescopic frame. The front end of the second film is hermetically connected to the rear end of the fixed frame to limit the second cavity.

[0027] The telescopic frame includes an expanded state and a telescopic state. The telescopic frame is configured to be able to switch between the expanded state and the telescopic state at least according to the flow direction of the fluid in the bronchus.

[0028] Preferably, the first support frame and the second support frame are of an integrally formed structure, and the materials of both are medical-grade shape memory alloy materials.

[0029] Both the first film and the second film are elastic films.

[0030] Furthermore, the annular wall support includes a support section, a transition section, an installation section, and a functional section which are connected in sequence.

[0031] The structures of the support section, the transition section, the installation section, and the functional section are all hollow structures.

[0032] The shapes of the support section and the installation section are respectively cylindrical with both ends open, and the diameter of the installation section is smaller than that of the support section; the shape of the transition section is conical.

[0033] The support section is configured to be able to be fixed on the inner wall of the bronchus at least so that the first film component can be supported in the bronchus.

[0034] The inner side wall of the installation section is connected to the assembly frame so that the assembly frame is located in the first cavity.

[0035] The functional section cooperates with the telescopic frame so that when the telescopic frame is in the expanded state, the second film can be attached to the first film to close the fluid channel; the functional section is a hemispherical annular wall with both ends open, and the diameter of the functional section gradually increases from front to back.

[0036] The first film includes a support portion, a transition portion, an installation portion, and a functional portion which are connected in sequence. The support portion, the transition portion, the installation portion, and the functional portion cooperate with the support section, the transition section, the installation section, and the functional section respectively.

[0037] Furthermore, the assembly frame is connected to the inner side wall of the installation section, and the assembly frame is located in the first cavity.

[0038] The assembly frame is a hollow support, and the shape of the assembly frame is a cone with both ends open, and the diameter of the front open end is smaller than that of the rear open end; the rear end of the assembly frame is connected to the inner side wall of the installation section, and the front end of the assembly frame extends into the transition section;

[0039] Preferably, the support section includes a connected first rhombic part and a second rhombic part. The first rhombic part is formed by surrounding a circle with multiple equal-sized first rhombic wire frames connected end to end. The second rhombic part is formed by surrounding a circle with multiple equal-sized second rhombic wire frames connected end to end. And the first rhombic wire frames of the first rhombic part form a part of the second rhombic wire frame;

[0040] Preferably, the installation section is formed by surrounding a circle with wavy wire strips connected end to end. The installation section includes a plurality of staggered front wave ends and rear wave ends. The front wave ends are connected to the transition section, and the number of the front wave ends is the same as that of the second rhombic wire frames of the transition section, and the rear corners of the second rhombic wire frames corresponding to the front wave ends are arranged in one-to-one correspondence; the rear wave ends are connected to the functional section;

[0041] Preferably, the transition section is formed by surrounding a circle with a plurality of ribs. The two ends of the ribs are respectively connected to the rear corners and the front wave ends of the relatively arranged second rhombic wire frames. The number of the ribs is equal to the number of the second rhombic wire frames and the front wave ends, and the three are arranged in one-to-one correspondence;

[0042] Preferably, the functional section is formed by surrounding a circle with wavy wire strips connected end to end. The functional section includes a plurality of staggered front small wave ends and rear large wave ends. The curvature of the front small wave ends is greater than that of the rear large wave ends; the number of the front small wave ends is the same as that of the front wave ends of the installation section, and the two are arranged in one-to-one correspondence. The front small wave ends are connected to the front wave ends, and the rear large wave ends are located at the rear end of the functional section;

[0043] Preferably, the assembly frame is formed by surrounding a circle with a plurality of support bars. The rear ends of the support bars are connected to the installation section, and the front ends of the support bars extend forward into the transition section; the shape of the support bars is an inner arc.

[0044] Furthermore, the structure of the scalable frame is a hollow structure;

[0045] The scalable frame includes a connection section and a scaling section. The front end of the connection section is connected to the fixed frame, and the rear end of the connection section is connected to the scaling section; the shape of the connection section is a cylindrical shape with both ends open; the scaling section is matched with the functional part. The scaling section is a hemispherical ring wall with both ends open, and the diameter of the scaling section gradually increases from front to back;

[0046] The fixing frame includes a convex mounting section and a sealing section which are connected. The convex mounting section is matched with the assembly frame to enable the second film support assembly and the assembly frame to be assembled and connected. The front end of the sealing section is connected to the convex mounting section, the rear section of the sealing section is connected to the front end of the connecting section, and the sealing section constitutes the bottom wall of the second cavity. The shape of the sealing section is cylindrical.

[0047] The second film covering includes a connecting portion and a telescopic portion. The connecting portion is matched with the connecting section. The front end of the connecting portion is hermetically connected to the rear section of the sealing section. The rear end of the connecting portion is connected to the telescopic portion. The connecting portion is seamlessly laid on the outer side wall of the connecting section, and the outer side wall of the connecting portion is flush with the side wall of the sealing section. The telescopic portion is matched with the telescopic section, and the telescopic portion is seamlessly laid on the outer side wall of the telescopic section.

[0048] Further, the telescopic frame is formed by enclosing multiple claw bars. The front ends of the claw bars are connected to the fixing frame. The claw bars extend vertically from front to back to form the connecting section, and then continue to extend arcuately outward to form the telescopic section.

[0049] Preferably, the shape of the sealing section is a solid cylinder. A groove with an opening facing backward is provided at the rear end of the sealing section. The wall thickness of the groove is the same as the wall thickness of the connecting section, and the connecting section is connected to the groove wall.

[0050] Preferably, the convex mounting section includes a necking portion, a convex portion, and a straight cylinder portion which are connected in sequence from front to back. The necking portion is a circular opening. The shape of the straight cylinder portion is a cylinder with both ends open. The convex portion protrudes outward relative to the necking portion and the straight cylinder portion.

[0051] Preferably, the convex mounting section is formed by enclosing multiple rib bars. The rear ends of the rib bars are connected to the front end of the sealing section. The rib bars first extend vertically forward from back to front to form the straight cylinder portion, then extend forward along an outer arc to form the convex portion, and finally stop extending at the necking portion to form a circular opening.

[0052] When the second film support assembly is assembled with the first film support assembly, after the convex mounting section is inserted from the center of the assembly frame, the front end of the assembly frame abuts against the rear end of the convex portion. Compared with the prior art, at least one of the beneficial effects that can be achieved by the present invention is as follows: The fluid passage of the one-way valve of the present invention is limited by the outer side wall of the second film support assembly and the inner side wall of the first film support assembly together. The outlet of the fluid passage is relatively large, and the fluid is discharged from the outer side wall of the second film support assembly and the inner side wall of the first film support assembly at the same time. In this way, it is not easy to cause the retention of secretions and avoid the phenomenon of blockage.

[0053] In the present utility model, the above technical solutions can also be combined with each other to achieve more preferred combined solutions. Other features and advantages of the present utility model will be described in the following content. Moreover, some advantages can be made obvious from the description or understood by implementing the present utility model. The objectives and other advantages of the present utility model can be achieved and obtained from the content specifically pointed out in the text and the drawings. Description of the Drawings

[0054] The drawings are only for the purpose of showing specific embodiments and are not considered as a limitation to the present utility model. Throughout the drawings, the same reference signs represent the same components.

[0055] Figure 1 It is a schematic structural diagram (one) of the bronchial one-way valve in the specific embodiment;

[0056] Figure 2 It is a schematic structural diagram (two) of the bronchial one-way valve in the specific embodiment;

[0057] Figure 3 It is a schematic structural diagram of the bronchial one-way valve when the fluid passage is closed in the specific embodiment;

[0058] Figure 4 It is a schematic structural diagram of the bronchial one-way valve when the fluid passage is open in the specific embodiment;

[0059] Figure 5 It is a cross-sectional view of the bronchial one-way valve when the fluid passage is closed in the specific embodiment;

[0060] Figure 6 It is a cross-sectional view of the bronchial one-way valve when the fluid passage is open in the specific embodiment (the dotted line with an arrow in the figure represents the flow path of the fluid in the one-way valve during exhalation);

[0061] Figure 7 It is a schematic structural diagram (one) of the first branch membrane assembly in the specific embodiment;

[0062] Figure 8 It is a schematic structural diagram (two) of the first branch membrane assembly in the specific embodiment;

[0063] Figure 9 It is a schematic structural diagram (three) of the first branch membrane assembly in the specific embodiment;

[0064] Figure 10 It is a cross-sectional view of the first branch membrane assembly in the specific embodiment;

[0065] Figure 11 It is a schematic structural diagram (one) of the first support frame in the specific embodiment;

[0066] Figure 12 Schematic diagram (II) of the first support frame in the specific implementation manner;

[0067] Figure 13 Schematic diagram (I) of the first film covering in the specific implementation manner;

[0068] Figure 14 Schematic diagram (II) of the first film covering in the specific implementation manner;

[0069] Figure 15 Schematic diagram (I) of the second film supporting assembly in the specific implementation manner;

[0070] Figure 16 Schematic diagram (II) of the second film supporting assembly in the specific implementation manner;

[0071] Figure 17 Cross-sectional view of the second film supporting assembly in the specific implementation manner;

[0072] Figure 18 Schematic diagram (I) of the second support frame in the specific implementation manner;

[0073] Figure 19 Schematic diagram (II) of the second support frame in the specific implementation manner;

[0074] Figure 20 Cross-sectional view of the second support frame in the specific implementation manner;

[0075] Figure 21 Schematic diagram (I) of the second film covering in the specific implementation manner;

[0076] Figure 22 Schematic diagram (II) of the second film covering in the specific implementation manner.

[0077] Reference numerals:

[0078] 1 - First film supporting assembly; 101 - First cavity; 11 - First support frame; 111 - Ring wall support; 111a - Support section; 111b - Transition section; 111c - Installation section; 111d - Functional section; 112 - Assembly frame; 12 - First film covering; 121 - Support part; 122 - Transition part; 123 - Installation part; 124 - Functional part; 2 - Second film supporting assembly; 201 - Second cavity; 202 - Groove; 21 - Second support frame; 211 - Fixed frame; 211a - Protruding mounting section; 211b - Sealing section; 212 - Scalable frame; 212a - Connection section; 212b - Scaling section; 22 - Second film covering; 221 - Connection part; 222 - Scaling part. Specific implementation manner

[0079] The preferred embodiments of the present utility model will be specifically described below in conjunction with the accompanying drawings. The accompanying drawings form a part of the present utility model and, together with the embodiments of the present utility model, are used to explain the principles of the present utility model, rather than to limit the scope of the present utility model.

[0080] In the description of the embodiments of the present utility model, it should be noted that unless otherwise clearly specified and limited, the term "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0081] The terms "top", "bottom", "above...", "below", and "on..." used throughout the description are relative positions with respect to the components of the device, such as the relative positions of the top and bottom substrates inside the device. It can be understood that the device is multifunctional and is independent of its orientation in space.

[0082] The normal working surface of the present utility model can be a plane or a curved surface, can be inclined, or can be horizontal. For the convenience of description, the embodiments of the present utility model are placed on a horizontal plane and used on the horizontal plane, and "high and low" and "up and down" are defined accordingly.

[0083] A specific embodiment of the present utility model discloses a bronchial one-way valve (hereinafter referred to as the one-way valve), as Figures 1 to 22 shown, which includes a first support film assembly 1 and a second support film assembly 2 located inside the first support film assembly 1; a fluid channel is defined by the inner sidewall of the first support film assembly 1 and the outer sidewall of the second support film assembly 2, and the second support film assembly 2 is configured to at least open or close the fluid channel according to the flow direction of the fluid in the bronchus.

[0084] The first support film assembly 1 is configured to at least be supported in the bronchus, that is, the bronchial one-way valve is stably fixed in the bronchus through the first support film assembly 1.

[0085] The second support film assembly 2 is located inside the first support film assembly 1. A fluid channel is defined by the outer sidewall of the second support film assembly 2 and the inner sidewall of the first support film assembly 1, that is, a fluid channel is formed between the first support film assembly 1 and the second support film assembly 2; the fluid channel is configured to at least allow the fluid in the bronchus to flow through; the second support film assembly 2 includes a first state and a second state, and the second support film assembly 2 is configured to at least switch between the first state and the second state according to the flow direction of the fluid in the bronchus;

[0086] Among them, when the second membrane component 2 is in the first state, the fluid channel is closed;

[0087] When the second membrane component 2 is in the second state, the fluid channel is opened.

[0088] That is to say, the second membrane component 2 can open or close the fluid channel according to the flow direction of the fluid in the bronchus. That is, the second membrane component 2 can open or close the fluid channel according to the patient's breathing.

[0089] The fluid includes any medium existing in the bronchus such as gas, secretion, etc.

[0090] Specifically, the flow direction of the fluid includes the intake direction and the exhaust direction. When the flow direction is the intake direction, the second membrane component 2 is in the first state and the fluid channel is closed; when the flow direction is the exhaust direction, the second membrane component 2 is in the second state and the fluid channel is opened.

[0091] When the one-way valve of the present utility model is placed in the bronchus of the target lung lobe segment of the patient, when the patient inhales (that is, the flow direction of the fluid is the intake direction), the second membrane component 2 is in the first state and the fluid channel is closed, that is, the inhaled gas does not enter the target lung lobe segment; when the patient exhales (that is, the flow direction of the fluid is the exhaust direction), the second membrane component 2 is in the second state and the fluid channel is opened. While exhaling the gas in the target lung lobe segment, the secretion at the distal end of the drainage airway is drained. In this way, as the patient breathes, the residual gas remaining in the target lung lobe segment is gradually discharged and the secretion flows out, so that the target lung lobe segment gradually fibroses, and the healthy lung gradually expands to play a compensatory role, and the patient's lung function is restored to cure the patient.

[0092] For the one-way valve of the present utility model, its fluid channel is jointly limited by the outer wall of the second membrane component and the inner wall of the first membrane component. The outlet of the fluid channel is relatively large, and the fluid is simultaneously led out from the outer wall of the second membrane component and the inner wall of the first membrane component. In this way, it is not easy to cause the retention of secretion and avoid the phenomenon of blockage.

[0093] The second membrane component 2 is configured to be connectable to the first membrane component 1 at least by assembly, so that the second membrane component 2 can be assembled inside the first membrane component 1. With such an arrangement, the first membrane component 1 and the second membrane component 2 are prepared separately and then assembled together to form a one-way valve. That is, the fluid passage of the present utility model is jointly limited by the first membrane component and the second membrane component. When producing the one-way valve, the first membrane component and the second membrane component can be separately manufactured and then assembled to form a fluid passage. Compared with the duckbill-shaped one-way valve (due to the irregular shape of the valve, its production process is complex, the yield rate is low, and the operations of implanting and retrieving the valve are complex), the production process of the one-way valve of the present utility model is relatively simple, and the cost rate is high, and the implanting and retrieving are simple and easy to operate.

[0094] According to an embodiment of the present utility model, the structure of the second membrane component 2 is an expandable and contractible structure. The second membrane component 2 is configured to be able to expand or contract at least according to the flow direction. The first state is the expanded state, and the second state is the contracted state, that is, the second membrane component can switch between the expanded state and the contracted state according to the fluid direction to close or open the fluid passage. Specifically, when the flow direction is the air intake direction, the second membrane component 2 is in the expanded state, and the fluid passage is closed; when the flow direction is the air outlet direction, the second membrane component 2 is in the contracted state, and the fluid passage is open.

[0095] In the expanded state, at least a part of the outer wall of the second membrane component 2 is hermetically attached to the inner wall of the first membrane component 1, and the attached part can be connected end to end to close the fluid passage. Preferably, in the expanded state, the rear end of the outer wall of the second membrane component 2 is hermetically attached to the inner wall of the first membrane component 1, or / and the rear end of the inner wall of the first membrane component 1 is hermetically attached to the outer wall of the second membrane component 2, so as to avoid gaps between the rear end of the outer wall of the second membrane component 2 and the inner wall of the first membrane component, or to avoid gaps between the rear end of the outer wall of the first membrane component 1 and the outer wall of the second membrane component, and eliminate any possibility of the fluid passage being opened during inhalation.

[0096] The hermetic attachment means that the attachment part is sealed and connected, and the fluid cannot pass through the attachment part.

[0097] It should be noted that when the rear end of the second membrane component 2 is located inside the first membrane component 1, it is preferred that the rear end of the outer side wall of the second membrane component 2 is hermetically attached to the inner side wall of the first membrane component 1; when the rear end of the second membrane component 2 extends from the rear end of the first membrane component 1, it is preferred that the rear end of the inner side wall of the first membrane component 1 is hermetically attached to the outer side wall of the second membrane component 2; when the rear ends of the second membrane component 2 and the first membrane component 1 are flush, it is preferred that the rear end of the outer side wall of the second membrane component 2 is hermetically attached to the rear end of the inner side wall of the first membrane component 1, that is, the rear end of the outer side wall of the second membrane component 2 is hermetically attached to the inner side wall of the first membrane component 1, and the rear end of the inner side wall of the first membrane component 1 is hermetically attached to the outer side wall of the second membrane component 2.

[0098] In the contracted state, at least a part of the outer side wall of the second membrane component 2 has a gap with the inner side wall of the first membrane component 1, and the gap part can at least extend from the front end to the rear end of the outer side wall of the second membrane component 2, that is, even if there is a fitting portion between the outer side wall of the second membrane component 2 and the inner side wall of the first membrane component 1 at this time, the fitting portion cannot be connected end to end to prepare for opening the fluid channel. Preferably, in the contracted state, any point on the outer side wall of the second membrane component 2 is not in contact with the inner side wall of the first membrane component 1, that is, the outer side wall of the second membrane component 2 is completely separated from the outer side wall of the first membrane component 1, so as to make the outlet area of the fluid channel as large as possible, so that the gas and secretions in the target lung lobe segment can be discharged outwards as much as possible with exhalation.

[0099] It should be noted that the fluid flows along the air outlet direction, and the end where the fluid first flows through is the front end of the first membrane component 1 and the second membrane component 2, and the end where the fluid then flows through is the rear end of the first membrane component 1 and the second membrane component 2.

[0100] Preferably, the second membrane component 2 expands or expands and contracts under the action of the fluid in the bronchus. Specifically, during exhalation, when the fluid in the target lung lobe segment flows outwards along the bronchus, it exerts a force on the outer side wall of the second membrane component, causing the second membrane component 2 to contract. The outer side wall of the second membrane component 2 is separated from the inner side wall of the first membrane component 1, and the fluid channel is opened. The gas and secretions in the target lung lobe segment are discharged through the fluid channel; during inhalation, when the external fluid flows inwards along the bronchus, it exerts a force on the inner side wall of the second membrane component 2, causing the second membrane component 2 to expand. The outer side wall of the second membrane component 2 is hermetically attached to the inner side wall of the first membrane component 1 (and the attached part is connected end to end), and the fluid channel is closed to prevent external fluid from entering the target lung lobe segment. With this setting, the second membrane component 2 can close or open the fluid channel by expanding or contracting according to breathing without setting a sensing structure and a control structure, which can not only simplify the structure of the second membrane component 2, but also effectively switch between the expanded state and the contracted state in a timely manner.

[0101] According to an embodiment of the present utility model, the first film support assembly 1 is provided with a first cavity 101 that is open at both the front and rear ends, and the second film support assembly 2 is installed in the first cavity 101. The cavity wall of the first cavity 101 constitutes the inner side wall of the first film support assembly 1. The second film support assembly 2 is provided with a second cavity 201 that is open at the rear end, that is, the opening direction of the second cavity 201 is the same as the air outlet direction, that is, the opening direction of the second cavity 201 is opposite to the air inlet direction.

[0102] The size of the second cavity 201 changes with the expansion and contraction of the second film support assembly 2. Specifically, the volume of the second cavity 201 in the expanded state is larger than the volume of the second cavity 201 in the contracted state. When exhaling, the fluid exerts a force on the outer side wall of the second film support assembly 2, causing the second film support assembly 2 to contract, the volume of the second cavity 201 to decrease, the outer side wall of the second film support assembly to separate from the inner side wall of the first film support assembly, and the fluid passage to open; when inhaling, the fluid exerts a force on the inner side wall of the second film support assembly 2 (i.e., the side cavity wall of the second cavity), causing the second film support assembly to expand, the volume of the second cavity 201 to increase, the outer side wall of the second film support assembly to be hermetically and tightly attached to the inner side wall of the first film support assembly (and the attached part is connected end to end), and the fluid passage to close.

[0103] Preferably, the shapes of the inner and outer side walls of the second film support assembly 2 are similar, that is, the thicknesses of the side walls of the second film support assembly 2 that form the side cavity wall of the second cavity 201 are equal everywhere. The shape of the second cavity 201 is a gradually expanding shape from the front end to the rear end (such as a conical shape, an umbrella shape, a trumpet shape, a bowl shape, or a hemispherical shape, etc.), that is, the diameter of the cavity 201 gradually increases from the front to the rear, so that the second film support assembly has better contractility and extensibility. Further, the shape of the side cavity wall of the second cavity 201 conforms to fluid mechanics to improve the force application effect of the fluid on the second film support assembly.

[0104] The first film support assembly 1 includes a first support frame 11 and a first film 12. The first support frame 11 includes an annular wall support 111 and an assembly frame 112. The annular wall support 111 cooperates with the first film 12, and the first film 12 is laid on the inner side wall of the annular wall support 111 to define the first cavity 101. That is, the shape of the first film 12 is basically the same as that of the first annular wall support 111, and is seamlessly connected to the inner side wall of the first annular wall support 111 to improve the tightness of the first film support assembly. The assembly frame 112 is connected to the annular wall support 111 and is located in the first cavity 101 to assemble the second film support assembly 2. The assembly frame 112 passes through the first film 12 and is connected to the annular wall support 111, and the assembly frame 112 is hermetically connected to the film.

[0105] The second membrane support assembly 2 includes a second support frame 21 and a second covering film 22, and the second support frame 21 includes a connected fixed frame 211 and a retractable frame 212. The fixed frame 211 is connected to the assembly frame 112 so as to set the second membrane support assembly 2 in the first cavity 1. The retractable frame 212 cooperates with the second covering film 22, and the second covering film 22 is laid on the outer side wall of the retractable frame 212, that is, the second covering film 22 is surrounded on the outer side wall of the retractable frame 22, and the front end of the second covering film 22 is sealedly connected to the rear end of the fixed frame 112 so as to limit the second cavity 201. That is, the second covering film 22 is basically consistent with the shape of the retractable frame 212, and is seamlessly connected to the outer side wall of the retractable frame 212 to improve the airtightness of the second membrane support assembly.

[0106] The second membrane assembly 2 is expanded and contracted through a retractable frame 212, that is, the retractable frame 212 includes an expanded state and a telescopic state, and the retractable frame 212 is configured to be able to switch between the expanded state and the telescopic state at least according to the flow direction of the fluid in the bronchus, that is, the retractable frame 212 is configured to achieve switching between the expanded state and the telescopic state under the action of the fluid in the bronchus.

[0107] The center lines AA of the first membrane assembly 1 and the second membrane assembly 2 coincide with each other.

[0108] In order to reduce the weight of the first membrane assembly 1 and the second membrane assembly 2 and to minimize the foreign body sensation of the one-way valve in the body, the first support frame 11 and the second support frame 12 are both hollow structures.

[0109] The annular wall bracket 111 includes a supporting section 111a, a transition section 111b, a mounting section 111c and a functional section 111d connected in sequence. Specifically, the annular wall bracket 111 includes a supporting section 111a, a transition section 111b, a mounting section 111c and a functional section 111d connected in sequence from front to back. The structures of the supporting section, the transition section, the mounting section and the functional section are all hollow structures.

[0110] Preferably, the center lines of the support section 111a , the transition section 111b , the installation section 111c , the functional section 111d , the assembly frame 112 , and the first covering membrane 12 coincide with the center line AA of the first membrane assembly 1 .

[0111] The supporting section 111 a and the mounting section 111 c are both cylindrical with open ends, and the diameter of the mounting section 111 a is smaller than the diameter of the supporting section 111 c.

[0112] The one-way valve is fixed to the inner wall of the bronchus through the support section 111a, that is, the support section 111a is configured to be able to be fixed to the inner wall of the bronchus at least, so that the first membrane assembly can be supported in the bronchus. The support section 111a has self-expansion property, which can fix the one-way valve at a certain position in the trachea without displacement. Specifically, the support section 111a includes a connected first diamond part and a second diamond part. The first diamond part is formed by enclosing a circle with a plurality of equal-sized first diamond wireframes connected end to end. The second diamond part is formed by enclosing a circle with a plurality of equal-sized second diamond wireframes connected end to end. And the first diamond wireframes of the first diamond part form a part of the second diamond wireframes. Specifically, the side length of the second diamond wireframe is twice the side length of the first diamond wireframe, and the number of the second diamond wireframes is half of the number of the first diamond wireframes. One second diamond wireframe is related to three adjacent first diamond wireframes. The middle first diamond wireframe shares an angle with the second diamond wireframe. The opposite connected side lengths of two adjacent first diamond wireframes on one side form one side length of the second diamond wireframe, and the opposite connected side lengths of two adjacent first diamond wireframes on the other side form the other side length of the second diamond wireframe. The included angle between these two side lengths is the shared angle between the first diamond wireframe and the second diamond wireframe, that is, the middle first diamond wireframe coincides with the second diamond wireframe and is located inside the second diamond wireframe. The first diamond wireframes of the first diamond part are staggered and coincide with the second diamond wireframes and are located inside the second diamond wireframes. In this embodiment, the first diamond part includes 14 first diamond wireframes, and the second diamond part includes 7 second diamond wireframes.

[0113] The inner side wall of the installation section 111c is connected to the assembly frame 112, so that the assembly frame 112 is located in the first cavity 101. The front end of the installation section 111c is connected to the rear end of the transition section 111b, and the rear end of the installation section 111c is connected to the front end of the functional end 111d. Specifically, the installation section 111c is formed by enclosing a circle with wavy wire strips connected end to end. The installation section 111c includes a plurality of staggered front wave ends and rear wave ends. The front wave ends are connected to the transition section 111b, and the number of the front wave ends is the same as the number of the second diamond wireframes of the transition section 111b, and the front wave ends are arranged in one-to-one correspondence with the rear end angles of the second diamond wireframes (the rear end angles are opposite to the shared angles between the first diamond wireframes and the second diamond wireframes). The rear wave ends are connected to the functional section 111d. Preferably, the ratio of the length of the installation section 111c to the length of the first support frame 11 is not greater than 1:8 and not less than 1:13. The length refers to the distance between the front and rear ends of the component. In this embodiment, the installation section 111c includes 7 front wave ends and 7 rear wave ends.

[0114] The front end of the transition section 111b is connected to the rear end of the support section 111a, and the rear end of the transition section 111b is connected to the front end of the installation section 111c. The shape of the transition section 111b is conical, that is, the shape of the transition section 111b is trumpet-shaped, which means the shape of the transition section 111b is a frustum ring wall shape, and the diameter of the transition section 111b gradually decreases from front to back. The transition section can effectively prevent the support side wall 11 from forming a rigid connection, making it easier for the first membrane support assembly to return to its original shape after deformation, playing an effective buffering role, and improving the stability and service life of the one-way valve.

[0115] The transition section 111b is surrounded by a plurality of ribs. The two ends of each rib are respectively connected to the rear corner of the second diamond-shaped grid and the front wave end of the installation section 111c that are oppositely arranged, that is, the number of ribs is equal to the number of the second diamond-shaped grids and the front wave ends, and the three are arranged in one-to-one correspondence. Preferably, the number of ribs is not less than 5 to ensure the stability of the one-way valve. In this embodiment, the transition section 111b includes 7 ribs, making the structure of the one-way valve more stable.

[0116] The functional section 111d cooperates with the telescopic frame 212 so that when the telescopic frame 212 is in the expanded state, the second film 22 can be attached to the first film 12 to close the fluid passage. Specifically, the shape of the functional section 111d is similar to the side wall of a bowl (i.e., a bowl shape without a bottom); that is, the functional section 111d is a hemispherical ring wall with both ends open, and the radius of the functional section 111d gradually increases from front to back, that is, the shape of the functional section 111d is an expanding type, and the side wall extends along an arc from the front end to the rear end. Specifically, the functional section 111d is surrounded by wavy strips connected end to end. The functional section 111d includes a plurality of staggered front small wave ends and rear large wave ends. The curvature of the front small wave ends is greater than that of the rear large wave ends, that is, the functional section 111d is formed by connecting a plurality of petal-shaped grids end to end. The number of the front small wave ends is the same as that of the front wave ends of the installation section 111c, and the two are arranged in one-to-one correspondence. The front small wave ends are connected to the front wave ends, and the rear large wave ends are located at the rear end of the functional section 111d. In this embodiment, it includes 7 front small wave ends and 7 rear large wave ends.

[0117] Preferably, the length ratio of the support section 111a, the transition section 111b, the installation section 111c, and the functional section 111d is 4:3:1:3. Preferably, the diameter ratio of the installation section 111c to the support section 111a is not greater than 1:2.

[0118] The first film coating 12 correspondingly includes a support portion 121, a transition portion 122, a mounting portion 123, and a functional portion 124 that are sequentially connected. The support portion 121, the transition portion 122, the mounting portion 123, and the functional portion 124 are respectively matched with the support section 111a, the transition section 111b, the mounting section 111c, and the functional section 111d. Specifically, the shape of the support portion 121 is the same as that of the support portion 121, which is a cylindrical shape with both ends open, and the support portion 121 is seamlessly laid on the inner side wall of the support section 111a; the shape of the transition portion 122 is the same as that of the transition section 111b, which is a cone with both ends open, and the transition portion is seamlessly laid on the inner side wall of the transition section 111b; the shape of the mounting portion 123 is the same as that of the mounting section 111c, which is a cylindrical shape with both ends open, and the diameter of the mounting portion 123 is smaller than the diameter of the support portion 121, and the mounting portion 123 is seamlessly laid on the inner side wall of the mounting section 111c; the shape of the functional portion 124 is the same as that of the functional section 111d, which is a hemispherical ring wall with both ends open, and the functional portion 124 is seamlessly laid on the inner side wall of the functional section 111d.

[0119] With such a setting, the fluid entering the first cavity 101 converges and accelerates at the mounting portion 123, strengthening the acting force on the outer side wall of the second film component 2. When exhaling, the fluid can be quickly discharged outward from the fluid channel, improving the use effect of the one-way valve. In addition, the shape of the functional portion 124 is an expanding type that extends in an arc shape from front to back, which can guide the fluid and enable the fluid to flow out of the fluid channel as soon as possible, avoiding the retention of secretions at the mounting portion 123.

[0120] For the annular wall support 111 of the present utility model, on the one hand, the axial length of the guiding valve is increased, which can not only improve the support stability of the first film component in the bronchus, but also better support and assemble the second film component; on the other hand, the shape settings of each section of the first annular wall support 111 further improve the support effect of the first film component.

[0121] The assembly frame 12 is connected to the inner side wall of the mounting section 111c, and the assembly frame 12 is located in the first cavity 101. Preferably, the assembly frame 12 is a hollowed-out support to avoid affecting the outward flow of the fluid. Specifically, the assembly frame 12 extends forward from the connection with the mounting section 111c to the transition portion 122, and forms a shape that tapers from back to front, that is, the shape of the assembly frame 12 is a cone with both ends open, and the diameter of the front open end is smaller than the diameter of the back open end, which not only facilitates the assembly of the second film component 2, improves the assembly stability of the first film component 1 and the second film component 2, but also can improve the stability of the first support frame 11, thereby ensuring the one-way valve.

[0122] Preferably, the assembly frame 12 is formed by enclosing a plurality of support bars. The rear ends of the support bars are connected to the rear wave ends of the mounting section 111c, and the front ends of the support bars extend forward to the transition section 122. To improve the support stability of the assembly frame 12. Preferably, the shape of the support bar is an inner arc (an arc that converges inward), which can better limit the second support film assembly 2 and prevent the second support film assembly 2 from skewing during expansion and contraction, that is, ensure that the center lines of the second support film assembly 2 and the first support film assembly 1 always coincide. The number of the support bars is the same as the number of the rear wave ends and the two are connected in a one-to-one correspondence. Preferably, the front side wall of the rear wave end is connected to the support bar, and the rear side wall of the rear wave end is connected to the front side wall of the front small wave end of the functional section through a short rod. In this embodiment, the assembly frame 12 includes 7 support bars.

[0123] The structure of the scalable frame 212 is a hollow structure. The scalable frame 212 includes a connecting section 212a and a scaling section 212b. The front end of the connecting section 212a is connected to the fixed frame 211, and the rear end of the connecting section 212a is connected to the scaling section 212b. The shape of the connecting section 212a is a cylindrical shape with both ends open. The scaling section 212b is matched with the functional part 124. The scaling section 212b is a hemispherical ring wall with both ends open, and the diameter of the scaling section 212b gradually increases from front to back. The diameter of the front end of the scaling section is approximately equal to (including equal to) the diameter of the connecting section. The diameter of the rear end of the scaling section changes with the expansion and contraction of the scaling section. When in the expanded state, the diameter of the rear end of the scaling section is not less than the diameter of the corresponding part of the functional part (that is, the position of the functional part corresponding to the rear end of the scaling section); when in the contracted state, the diameter of the rear end of the scaling section is less than the diameter of the corresponding part of the functional part, so that the second support film assembly is separated from the first support film assembly. Preferably, the connection between the connecting section 212a and the scaling section 212b adopts an arc transition to improve the good expansion and contraction performance of the scalable frame 212. To ensure the expansion and contraction amplitude of the scalable frame 212, the length ratio of the connecting section 212a to the scaling section 212b is not greater than 1:10.

[0124] It should be noted that in this embodiment, the rear end of the second support film assembly does not extend out of the rear end of the first support film assembly. Preferably, when the second support film assembly is in the expanded state: the rear end of the outer side wall of the second support film assembly is in airtight fit with the inner side wall of the first support film assembly; or, the rear end of the outer side wall of the second support film assembly is in airtight fit with the inner side wall of the first support film assembly, and the rear end of the inner side wall of the first support film assembly is in airtight fit with the outer side wall of the second support film assembly.

[0125] Preferably, the scalable frame 212 is formed by enclosing multiple claw bars. The front ends of the claw bars are connected to the fixed frame 211. The claw bars extend vertically from front to back to form a connecting section 212a, and then continue to extend arcuately outward to form a scalable section 212b. In this embodiment, the scalable frame 212 includes seven claw bars.

[0126] The fixed frame 211 includes a convex mounting section 211a and a sealing section 211b connected to each other. The convex mounting section 211a cooperates with the mounting frame 112 to enable the second film support assembly to be detachably connected to the mounting frame. The front end of the sealing section 211b is connected to the convex mounting section 211a, the rear section of the sealing section 211b is connected to the front end of the connecting section 212a, and the sealing section 212b constitutes the bottom wall of the second cavity 201.

[0127] Preferably, the sealing section 212b is in the shape of a solid cylinder, and the diameter of the sealing section 212b is approximately equal to (including equal to) the diameter of the connecting section 212a.

[0128] To improve the stability and connection elasticity of the scalable frame 212, a groove 202 with an opening facing backward is provided at the rear end of the sealing section 212b. The wall thickness of the groove is approximately the same as the wall thickness of the connecting section 212a, and the connecting section 212a is connected to the groove wall. With this arrangement, the connection strength and elasticity between the scalable frame 212 and the sealing section 212b can be improved. The bottom of the groove 202 is the bottom wall of the second cavity 201.

[0129] The structure of the convex mounting section 211a is a hollow structure with both ends open, similar to the shape of a wine glass, that is, the convex mounting section includes a reduced diameter portion, a protruding portion, and a straight cylinder portion connected in sequence from front to back. The reduced diameter portion is a circular open end, the shape of the straight cylinder portion is a cylinder with both ends open, and the diameter of the straight cylinder portion is equal to the diameter of the sealing section; the protruding portion protrudes outward relative to the reduced diameter portion and the straight cylinder portion. Preferably, the side wall of the convex mounting section extends rearward along an outer arc from the reduced diameter portion to the straight cylinder portion. Thus, a protruding bending portion is formed at the connection between the protruding portion and the straight cylinder portion.

[0130] The convex mounting section 211a is formed by enclosing multiple rib bars. The rear ends of the rib bars are connected to the front end of the sealing section. The rib bars first extend vertically forward to form the straight cylinder portion from back to front, then extend forward along an outer arc to form the protruding portion, and finally stop extending at the reduced diameter portion to form a circular open end.

[0131] When the second film support assembly is assembled with the first film support assembly, after the convex mounting section 211a can be inserted into the mounting frame 112, the front end of the mounting frame 112 abuts against the protruding bending portion of the convex mounting section 211a (that is, the front end of the mounting frame abuts against the rear end of the protruding portion of the convex mounting section), so as to realize the fixed connection between the fixed frame 211 and the mounting frame 112.

[0132] With such a setting, it is possible to prevent the second membrane component from forming a rigid connection with the first membrane component. On the one hand, it can prevent the second membrane component from being skewed and can also extend the service life of the one-way valve.

[0133] It should be noted that the number of ribs of the convex mounting section 211a is much larger than the number of struts of the mounting frame 112 (the number of ribs of the convex mounting section 211a is at least three times the number of struts of the mounting frame 112. In this embodiment, the number of ribs of the convex mounting section 211a is 24), and the gap between adjacent ribs is much smaller than the width of the strut (the gap between the ribs is at most 1 / 3 of the width of the strut), so as to prevent the strut from accidentally inserting between the ribs and affecting the connection between the second membrane component and the first membrane component.

[0134] The second film 22 includes a connecting portion 221 and a telescopic portion 222. The connecting portion 221 cooperates with the connecting section 212a. The front end of the connecting portion 221 is hermetically connected to the rear section of the sealing section 211b. The rear end of the connecting portion 221 is connected to the telescopic portion 222. The connecting portion 221 is seamlessly laid on the outer side wall of the connecting section 212a. Preferably, the outer side wall of the connecting portion 221 is flush with the side wall of the sealing section 211b. The telescopic portion 222 cooperates with the telescopic section 212b, and the telescopic portion 212b is seamlessly laid on the outer side wall of the telescopic section 212b.

[0135] Preferably, the rear end of the second membrane component does not extend beyond the rear end of the first membrane component, that is, the second membrane component is completely located inside the first cavity 101. With such a setting, the structure of the one-way valve is made more compact, and it can protect the second membrane component and prevent the second membrane component from being accidentally skewed.

[0136] For the convenience of processing and to improve the stability of the first membrane component and the second membrane component, the first support frame 11 and the second support frame 21 are respectively made by an integrally formed method, and both are made of a medical-grade shape memory alloy material.

[0137] The first film 12 and the second film 22 are both films with a certain elasticity. Exemplarily, the materials of the first film 12 and the second film 22 are medical-grade silicone or TPU (thermoplastic polyurethane). Preferably, the first film 12 and the second film 22 are respectively laid on the annular wall support 111 and the telescopic frame 212 through a film laying process to simplify the manufacturing process of the one-way valve and improve the yield. The film laying process is to immerse the support in liquid silicone. After taking it out, a film will be formed on the surface, and then it can be cured by high temperature.

[0138] Once the current duckbill-shaped one-way valve is implanted, the patient does not develop the expected atelectasis of the target lung lobe, and there is no further remedial measure to deal with the bypass ventilation of the target lung lobe that was not recognized preoperatively. The one-way valve of the present utility model has a structure of two inner and outer membranes (i.e., the first covering membrane and the second covering membrane), and the outer edge of the inner membrane (the second covering membrane) does not exceed the outer edge of the outer membrane (the first covering membrane). When the bronchial one-way valve is implanted in the patient and the patient does not develop the expected atelectasis of the target lung lobe, bioadhesive can be used to seal the valve between the first covering membrane and the second covering membrane. Even if the first covering membrane and the second covering membrane adhere to each other, the one-way valve is always in the first state, that is, the fluid channel is completely closed, thereby forming complete obstructive atelectasis of the target lung lobe, becoming a potential remedial measure to achieve lung volume reduction of the target lung lobe.

[0139] The above is only the preferred specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed by the present utility model should be covered within the protection scope of the present utility model.

Claims

1. A bronchial one-way valve, characterized in that: It includes a first membrane assembly and a second membrane assembly located in the first membrane assembly; The inner wall of the first membrane assembly and the outer wall of the second membrane assembly define a fluid channel, and the second membrane assembly is configured to at least open or close the fluid channel according to the flow direction of the fluid in the bronchus.

2. The bronchial one-way valve according to claim 1, characterized in that: The second membrane assembly includes a first state and a second state, and the flow direction of the fluid includes an air inlet direction and an air outlet direction; When the flow direction is the air intake direction, the second membrane assembly is in the first state, and the fluid channel is closed; When the flow direction is the air outlet direction, the second membrane assembly is in the second state, and the fluid channel is open.

3. The bronchial one-way valve according to claim 2, characterized in that: The second membrane assembly is configured to be connectable to the first membrane assembly at least by assembly, so that the second membrane assembly is assembled in the first membrane assembly.

4. The bronchial one-way valve according to claim 3, characterized in that: The structure of the second membrane assembly is an expandable and contractible structure, and the second membrane assembly is configured to be able to expand or contract at least according to the flow direction; The first state is an expanded state, and the second state is a contracted state.

5. The bronchial one-way valve according to claim 4, characterized in that: In the expanded state, at least a portion of the outer wall of the second membrane assembly is tightly fitted with the inner wall of the first membrane assembly, and the fitted portions can be connected end to end to close the fluid channel; In the contracted state, at least part of the outer wall of the second membrane assembly has a gap with the inner wall of the first membrane assembly, and the gap can at least extend from the front end to the rear end of the outer wall of the second membrane assembly to prepare for opening the fluid channel.

6. The bronchial one-way valve according to claim 5, characterized in that: In the expanded state, the rear end of the outer wall of the second membrane assembly is tightly fitted with the inner wall of the first membrane assembly, or / and the rear end of the inner wall of the first membrane assembly is tightly fitted with the outer wall of the second membrane assembly; In the contracted state, any point of the outer side wall of the second membrane assembly is not in contact with the inner side wall of the first membrane assembly.

7. The bronchial one-way valve according to claim 6, characterized in that: The second membrane component expands or contracts under the action of the fluid in the bronchus.

8. The bronchial one-way valve according to any one of claims 1 to 7, characterized in that: The first membrane assembly is provided with a first cavity with open front and rear ends, and the second membrane assembly is mounted in the first cavity; The second membrane assembly is provided with a second cavity with an open rear end, and the shape of the second cavity is a shape that gradually expands from front to back.

9. The bronchial one-way valve according to claim 8, characterized in that: The first membrane assembly includes a first support frame and a first covering membrane; The first support frame includes an annular wall support and an assembly frame, and the assembly frame is connected to the annular wall support to prepare for assembling the second membrane assembly; The annular wall support cooperates with the first coating, and the first coating is applied on the inner wall of the annular wall support.

10. The bronchial one-way valve according to claim 9, characterized in that: The second membrane assembly includes a second support frame and a second covering membrane; The second support frame includes a connected fixed frame and a retractable frame, and the fixed frame is connected to the assembly frame to prepare for mounting the second membrane assembly in the first cavity; The retractable frame cooperates with the second coating, the second coating is applied to the outer wall of the retractable frame, and the front end of the second coating is sealedly connected to the rear end of the fixed frame to limit the second cavity; The retractable frame includes an expanded state and a retracted state, and the retractable frame is configured to be switchable between the expanded state and the retracted state at least according to the flow direction of the intrabronchial fluid.

11. The bronchial one-way valve according to claim 10, characterized in that: The first support frame and the second support frame are integrally formed structures, and both are made of medical grade memory alloy materials; The first coating film and the second coating film are both thin films with elasticity.

12. The bronchial one-way valve according to claim 10, characterized in that: The annular wall bracket comprises a supporting section, a transition section, a mounting section and a functional section which are connected in sequence; The structures of the support section, transition section, installation section and functional section are all hollow structures; The support section and the mounting section are both cylindrical with both ends open, and the diameter of the mounting section is smaller than the diameter of the support section; the transition section is conical; The support segment is configured to be at least fixed to the inner wall of the bronchus, so that the first membrane assembly can be supported in the bronchus; The inner side wall of the mounting section is connected to the assembly rack so that the assembly rack is located in the first cavity; The functional section cooperates with the retractable frame, so that when the retractable frame is in an expanded state, the second covering film can be fitted with the first covering film to close the fluid channel; the functional section is a hemispherical ring wall with open ends, and the diameter of the functional section gradually increases from front to back; The first coating includes a supporting portion, a transition portion, a mounting portion and a functional portion which are connected in sequence, and the supporting portion, the transition portion, the mounting portion and the functional portion are matched with the supporting section, the transition section, the mounting section and the functional section respectively.

13. The bronchial one-way valve according to claim 12, characterized in that: The assembly rack is connected to the inner side wall of the installation section, and the assembly rack is located in the first cavity; The assembly frame is a hollow bracket, and the shape of the assembly frame is a cone with two ends open, and the diameter of the front opening is smaller than the diameter of the rear opening; the rear end of the assembly frame is connected to the inner wall of the installation section, and the front end of the assembly frame extends into the transition part.

14. The bronchial one-way valve according to claim 13, characterized in that: The support section includes a first rhombus portion and a second rhombus portion connected together, the first rhombus portion is formed by a plurality of first rhombus frames of equal size connected end to end and arranged in a circle, the second rhombus portion is formed by a plurality of second rhombus frames of equal size connected end to end and arranged in a circle, and the first rhombus frames constitute a part of the second rhombus frames.

15. The bronchial one-way valve according to claim 14, characterized in that: The installation section is formed by wavy mesh strips connected end to end, and the installation section includes a plurality of staggered front wave ends and rear wave ends, the front wave ends are connected to the transition section, and the number of the front wave ends and the second diamond grid frames of the transition section is the same, and the rear end angles of the front wave ends and the second diamond grid frames are arranged one by one; the rear wave ends are connected to the functional section.

16. The bronchial one-way valve according to claim 15, characterized in that: The transition section is surrounded by a plurality of ribs, the two ends of which are respectively connected to the rear end corner and the front wave end of the second rhombus grid which are arranged oppositely. The number of ribs is equal to the number of the second rhombus grid and the front wave end, and the three are arranged in one-to-one correspondence.

17. The bronchial one-way valve according to claim 16, characterized in that: The functional section is surrounded by wavy mesh strips connected end to end, and includes a plurality of staggered front small wave ends and rear large wave ends, wherein the curvature of the front small wave ends is greater than that of the rear large wave ends; the number of the front small wave ends is the same as that of the front wave ends of the installation section, and the two are arranged in a one-to-one correspondence, the front small wave ends are connected to the front wave ends, and the rear large wave ends are located at the rear end of the functional section.

18. The bronchial one-way valve according to claim 17, characterized in that: The assembly frame is surrounded by a plurality of support bars, the rear ends of the support bars are connected to the installation sections, and the front ends of the support bars extend forward to the transition section; and the shape of the support bars is an inner arc.

19. The bronchial one-way valve according to claim 12, characterized in that: The structure of the retractable frame is a hollow structure; The retractable frame includes a connecting section and a retractable section, the front end of the connecting section is connected to the fixed frame, and the rear end of the connecting section is connected to the retractable section; the connecting section is in the shape of a cylinder with two ends open; the retractable section cooperates with the functional part, the retractable section is a hemispherical ring wall with two ends open, and the diameter of the retractable section gradually increases from front to back; The fixing frame includes a connected convex section and a sealing section, the convex section cooperates with the assembly frame so that the second membrane assembly can be assembled and connected with the assembly frame; the front end of the sealing section is connected to the convex section, the rear section of the sealing section is connected to the front end of the connecting section, and the sealing section constitutes the bottom wall of the second cavity; the shape of the sealing section is cylindrical; The second coating includes a connecting portion and a shrinking portion, the connecting portion cooperates with the connecting section, the front end of the connecting portion is sealed and connected to the rear section of the sealing section, the rear end of the connecting portion is connected to the shrinking portion, the connecting portion is seamlessly laid on the outer side wall of the connecting section, and the outer side wall of the connecting portion is flush with the side wall of the sealing section; the shrinking portion cooperates with the shrinking section, and the shrinking portion is seamlessly laid on the outer side wall of the shrinking section.

20. The bronchial one-way valve according to claim 19, characterized in that: The retractable frame is surrounded by a plurality of claw strips, the front end of the claw strips is connected to the fixed frame, the claw strips vertically extend from front to back to form the connecting section, and then continue to extend outward in an arc shape to form the retractable section.

21. The bronchial one-way valve according to claim 20, characterized in that: The sealing section is in the shape of a solid cylinder. A groove opening backwards is provided at the rear end of the sealing section. The wall thickness of the groove is the same as that of the connecting section, and the connecting section is connected to the wall of the groove.

22. The bronchial one-way valve according to claim 21, characterized in that: The convex section includes a necked portion, a raised portion and a straight portion connected in sequence from front to back, the necked portion is a circular opening, the straight portion is a cylindrical shape with two ends open, and the raised portion protrudes outward relative to the necked portion and the straight portion.

23. The bronchial one-way valve according to claim 22, characterized in that: The convex section is composed of a plurality of ribs, the rear end of the ribs is connected to the front end of the sealing section, and the ribs first extend vertically forward from the back to the front to form a straight tube, then extend forward along the outer arc to form a convex part, and finally extend and stop at the necking part to form a circular opening; When the second membrane assembly is assembled with the first membrane assembly, after the convex assembly section is inserted from the center of the assembly frame, the front end of the assembly frame abuts against the rear end of the convex portion.

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