Membrane flap, biopsy valve, and endoscope

Abstract

Provided in the present application are a membrane flap, a biopsy valve, and an endoscope, relating to the field of medical devices. The membrane flap has a first surface and a second surface. The second surface faces the side of an instrument tube, and the first surface is located on the side opposite to the second surface. The membrane flap is provided with a slit and a guide slit. The slit penetrates through the first surface and the second surface. The guide slit is connected to the slit and extends from the slit to a side away from the slit. The guide slit only penetrates through the second surface without penetrating through the first surface. The thickness of the membrane flap at the slit is greater than the thickness of the membrane flap in the remaining regions. Compared with the prior art, the present application effectively reduces air leakage caused by irregular openings and significantly reduces whistling noise generated by vibration of the membrane flap, enhancing sealing performance and use stability, and improving the operational effectiveness of the endoscope during surgery.

Description

A membrane flap, biopsy valve, and endoscope Technical Field

[0001] This application relates to the field of medical device technology, and in particular to a membrane flap, a biopsy valve, and an endoscope. Background Technology

[0002] With the rapid development of medical technology, medical endoscopes have become an important tool for diagnosing and treating various diseases, especially in the management of digestive and urinary system diseases, such as kidney stones and gallstones. The application of endoscopes plays a crucial role in ensuring patient health and surgical safety. An endoscope typically consists of a handle and an insertion section. The insertion section can be inserted into the body cavity for examination or treatment. The insertion section has an instrument channel, and the handle is equipped with a biopsy valve that communicates with the instrument channel. Through the biopsy valve, the surgeon can guide surgical instruments into the patient's body cavity for treatment.

[0003] In addition to guiding instruments, the instrument channel of an endoscope often serves as a suction channel for aspirating fluids from body cavities or for injecting irrigation fluid to clean the surgical area. Biopsy valves are designed to airtightly seal the entry port of the instrument channel to prevent fluid leakage and contamination. However, biopsy valves typically consist of a resilient flap with an opening that is usually self-closing to airtightly seal the instrument channel. When an instrument is inserted through the opening, the flap expands, allowing the instrument to smoothly enter the instrument channel.

[0004] Although the flap can achieve self-closure and airtight sealing, its tear strength is low, making it prone to rupture during instrument insertion. This results in the biopsy valve failing to maintain an effective seal, especially during aspiration procedures through the instrument channel, leading to loss of airtightness. Furthermore, the flap may vibrate when affected by airflow, generating unwanted whistling sounds during aspiration and further hindering the smooth progress of the procedure. Summary of the Invention

[0005] To address the aforementioned issues, this application provides a membrane flap, a biopsy valve, and an endoscope.

[0006] In a first aspect, this application provides a membrane flap, which adopts the following technical solution:

[0007] A flap for use in an endoscope, the endoscope including an instrument tube and a biopsy valve in communication with the instrument tube, the flap being disposed on the biopsy valve, the flap having a first surface and a second surface, the second surface facing the instrument tube and the first surface being located on a side away from the second surface;

[0008] The flap is provided with a slit and a guide slit. The slit penetrates the first surface and the second surface. The guide slit is connected to the slit and extends from the slit toward the side away from the slit. The guide slit only penetrates the second surface and does not penetrate the first surface.

[0009] The thickness of the flap at the slit is greater than the thickness of the rest of the flap.

[0010] Secondly, this application provides a biopsy valve, which adopts the following technical solution:

[0011] A biopsy valve includes the membrane flap described in the above technical solution. The biopsy valve includes a port for communicating with an instrument tube, and the membrane flap is disposed at the port to close the port.

[0012] Thirdly, this application provides an endoscope, which adopts the following technical solution:

[0013] An endoscope includes a handle and an insertion part, the insertion part being provided with an instrument tube, and also includes a biopsy valve as described in the above technical solution, the biopsy valve being disposed on the handle and communicating with the instrument tube.

[0014] This application has the following beneficial effects:

[0015] This application utilizes a pre-designed guide suture on the flap to ensure that when instruments are inserted into the instrument tube, the flap naturally tears along the guide suture, forming a surrounding structure that tightly encloses the instruments. This design effectively avoids gaps between the instruments and the flap, significantly enhancing the seal and reducing air leakage caused by irregular openings. Therefore, the flap provides a more stable and reliable airtight seal, effectively preventing the leakage or contamination of body fluids within the surgical cavity during procedures.

[0016] Furthermore, the greater thickness of the flap at the slit provides a larger contact area when in contact with instruments, further improving the sealing effect. The thicker flap has stronger resilience and sealing pressure after being subjected to force, enabling it to form a tight seal with instruments and reducing the risk of air leakage. This design not only enhances the sealing performance of the flap but also effectively improves the application of endoscopes in complex surgical environments.

[0017] To further improve the stability of the flap, this application increases the thickness in the slit region of the flap, enhancing its overall rigidity. A thicker flap exhibits greater resistance to deformation and higher friction, maintaining a stable shape and reducing vibration during instrument contact. Therefore, the flap's deformation capability is optimized, and the vibration amplitude is significantly reduced, effectively minimizing vibration-induced whistling. This improvement allows for a more stable operating environment during endoscopy, reducing unnecessary noise interference and helping surgeons perform procedures more precisely and efficiently. Attached Figure Description

[0018] Figure 1 is a schematic diagram of the first structure according to an embodiment of this application;

[0019] Figure 2 is a schematic diagram of the second structure according to an embodiment of this application;

[0020] Figure 3 is a schematic diagram of the third structure of an embodiment of this application;

[0021] Figure 4 is a schematic diagram of the fourth structure of an embodiment of this application;

[0022] Figure 5 is a schematic diagram of the fifth structure of an embodiment of this application;

[0023] Figure 6 is a schematic diagram of the biopsy valve;

[0024] Figure 7 is a schematic diagram of the first partial structure of the endoscope;

[0025] Figure 8 is a schematic diagram of the second part of the endoscope;

[0026] Figure 9 is a structural schematic diagram of part A in Figure 8;

[0027] Figure 10 is a schematic diagram of the endoscope.

[0028] The diagram is marked as follows:

[0029] 10. Endoscope; 11. Insertion section; 11a. Instrument tube; 12. Biopsy valve; 12a. Port; 13. Handle; 100. Membrane flap; 110. First surface; 111. First face; 112. Second face; 120. Second surface; 121. Third face; 122. Fourth face; 130. Slit; 131. First wall surface; 132. Second wall surface; 140. Guide slit; 150. Interlocking structure; 151. First protrusion; 152. Second protrusion; 153. First interlocking groove; 154. Second interlocking groove; 155. First sealing part; 156. Second sealing part. Detailed Implementation

[0030] In the various embodiments of this application, "near end" and "far end" refer to the distance of each component from the user in the usage environment. The end closer to the user is designated as the "near end", and the end farther from the user is designated as the "far end".

[0031] In addition to guiding instruments, the instrument channel of an endoscope often serves as a suction channel to aspirate fluids from body cavities or to inject irrigation fluid to clean the surgical area. The biopsy valve is designed to airtightly seal the entry port of the instrument channel to prevent fluid leakage and contamination. Typically, a biopsy valve consists of a resilient flap with an opening that usually has a self-closing property to airtightly seal the instrument channel. During use, when an instrument is inserted through the opening, the flap expands, allowing the instrument to smoothly enter the instrument channel.

[0032] However, the inventors discovered that during actual use, the flap may be affected by airflow, causing vibration and resulting in a whistling sound during suction operations. This phenomenon adversely affects the surgical procedure. Through analysis, the inventors concluded that the main reason for the whistling sound is the vibration of the flap under the influence of airflow. Traditional flap structures are relatively thin and easily affected by friction and airflow changes during instrument insertion, leading to flap vibration and whistling.

[0033] To address this issue, this application proposes a flap, biopsy valve, and endoscope, primarily by increasing the thickness of the flap in its slit region to enhance its overall rigidity. A thicker flap exhibits stronger resistance to deformation and greater friction, enabling it to maintain a stable shape upon contact with instruments, reducing vibration. The increased friction also makes the flap less prone to movement relative to instruments, thus suppressing vibration. Therefore, the flap's deformation capability is optimized, and the vibration amplitude is significantly reduced, effectively minimizing vibration-induced whistling. This improvement not only enhances the flap's sealing performance but also provides a more stable operating environment for the endoscope during use, reducing unnecessary noise interference and facilitating more precise and efficient surgical procedures.

[0034] The following detailed description of a membrane flap, biopsy valve, and endoscope provided in this application, with reference to Figures 1 to 10, through specific embodiments and application scenarios, will be provided in detail.

[0035] The first aspect of this embodiment describes a membrane flap in detail.

[0036] Referring to Figures 8 and 10, this application discloses a flap for use in an endoscope 10. Exemplarily, the endoscope 10 includes an insertion portion 11 and a handle 13. An instrument tube 11a is disposed within the insertion portion 11, and a biopsy valve 12 is disposed on the handle 13. The biopsy valve 12 communicates with the instrument tube 11a, and a flap 100 is disposed on the biopsy valve 12. The function of the flap 100 is to airtightly seal the channel between the instrument tube 11a and the biopsy valve 12 when the biopsy valve 12 is not inserted, preventing leakage of bodily fluids or other substances.

[0037] When instrument insertion is required, the instrument can pass through the flap 100, which expands to enter the instrument tube 11a. At this time, the flap 100 effectively seals the gap between the instrument and the biopsy valve 12, ensuring a seal between the instrument and the flap 100 as the instrument passes through the biopsy valve 12, thereby preventing bodily fluids from leaking out of the biopsy valve 12. The flap 100 is designed with a reasonable structure and materials to maintain a tight seal during instrument insertion, preventing contamination and infection.

[0038] The structural design of the flap 100 plays a crucial role in the sealing effect. The flap 100 typically has a self-closing opening; when an instrument is inserted, the flap 100 is opened by the pressure of the instrument, and when the instrument is withdrawn, the flap 100 automatically returns to its closed state, forming an airtight seal. This design of the flap 100 helps ensure that the passage of the instrument tube 11a remains sealed before instrument use, and that during use, the contact between the instrument and the flap 100 ensures that the seal is not disturbed.

[0039] Referring to Figures 1 and 2, the flap 100 has a first surface 110 and a second surface 120. The second surface 120 faces the instrument tube 11a, and the first surface 110 is located on the side opposite to the second surface 120. For example, the flap 100 can be cylindrical, with the first surface 110 being one end face and the second surface 120 being the other end face. It is worth noting that the flap 100 is typically thin, and the end faces of the flap 100 can be planar, curved, or a combination of multiple planar and curved surfaces. These end face designs can be optimized according to actual needs and the usage environment.

[0040] In some designs, the flap 100 has a slit 130 and a guide slit 140. The slit 130 penetrates the first surface 110 and the second surface 120. The guide slit 140 connects to the slit 130 and extends from the slit 130 towards the side opposite to the slit 130. The guide slit 140 only penetrates the second surface 120 and not the first surface 110. Notably, the thickness of the flap 100 at the slit 130 is greater than the thickness of the rest of the flap 100. This design gives the slit 130 region greater rigidity, increasing the difficulty of vibration when the flap 100 contacts the instrument, thereby reducing vibration-induced noise and instability.

[0041] Specifically, the flap 100 at the slit 130 is thicker to enhance its sealing effect when in contact with the instrument. The thicker area of ​​the flap 100 effectively resists the pressure from instrument insertion, reducing localized deformation and thus maintaining a tight seal and minimizing vibration. However, because the remaining areas of the flap 100 are thinner, this portion deforms earlier during instrument insertion, transferring the deformation to the slit 130. This structural design not only ensures that the flap 100 provides appropriate deformation during instrument insertion, allowing for smooth insertion, but also, by increasing the deformation area, prevents the flap 100 from becoming too thick, which could lead to loss of elasticity or difficulty in instrument insertion.

[0042] Therefore, although the flap 100 in the slit 130 region is relatively thick, the flap 100 is thinner in other areas, allowing it to maintain good elasticity and deformation capacity during instrument insertion. This ensures a good seal while still allowing for smooth instrument insertion. This improves the sealing performance and avoids obstruction of instrument insertion by excessively thick areas, thus optimizing the flap 100's performance and making it adaptable to different operational needs.

[0043] It is understandable that the thickness of the flap 100 at the slit 130 is greater than the thickness of the flap 100 in the rest of the area, meaning that the thickness of the flap 100 gradually decreases from the slit 130 away from it. In some embodiments, the slit 130 is elongated, meaning that the flap 100 is thickest along the direction of the slit 130. The flap 100 is generally made of elastic materials such as rubber or latex, providing sufficient sealing performance and elasticity.

[0044] The slit 130 is typically located in the central region of the flap 100. When the flap 100 is cylindrical, the slit 130 extends along the diameter of the flap 100. This design helps to achieve the functionality of the flap 100, enabling it to maintain a better seal when in contact with an instrument, and to effectively adapt to the insertion and withdrawal of the instrument through the deformation of the flap 100.

[0045] This application improves the rigidity of the flap 100 by increasing the thickness in the slit 130 region, giving it stronger resistance to deformation and greater friction. This allows the flap 100 to better resist vibrations caused by instrument friction or airflow changes during instrument insertion, thereby reducing the vibration amplitude of the flap 100. Because the deformation capability of the flap 100 is optimized, it is less prone to unnecessary vibrations during instrument insertion, effectively reducing whistling sounds caused by flap 100 vibration.

[0046] This design allows the flap 100 to maintain a tight seal while preventing vibration and noise, thus improving the operational stability of the endoscope 10. Reducing unnecessary noise interference provides a more stable operating environment during surgery, allowing surgeons to focus more on the procedure and improving efficiency and safety.

[0047] According to an optional embodiment, referring to Figures 2 and 5, the depth of the guide slit 140 gradually decreases from the side near the slit 130 to the side away from the slit 130. When the instrument is inserted into the slit 130, the flap 100 is stretched open, causing a tear at the guide slit 140. By setting the depth of the guide slit 140 near the slit 130 to be deeper, it is easier for the flap 100 to tear first when it stretches open. As the flap 100 tears, the depth of the guide slit 140 gradually decreases, which not only effectively reduces excessive tearing of the guide slit 140, but also provides a certain covering force for the instrument, thereby enhancing the stability of the instrument and preventing excessive tearing. Finally, the slit 130 can still maintain sufficient elasticity after being stretched open, so that the instrument is tightly wrapped, thereby reducing the risk of leakage and improving the sealing effect.

[0048] According to an optional embodiment, the guide slit 140 extends from the end of the slit 130 to both sides of the slit 130. This effectively increases the contact area between the flap 100 and the instrument, thereby providing a better seal. This extended design ensures that the flap 100 has appropriate deformation and elasticity during instrument insertion, allowing it to provide sufficient containment force without causing difficulty in instrument insertion or adjustment due to excessive stiffness. Therefore, this structure not only helps maintain instrument stability but also ensures adaptability and flexibility under different operating conditions.

[0049] According to an optional embodiment, referring to Figures 1 and 5, the guide slit 140 is arc-shaped. This arc-shaped design allows the guide slit 140 to form a curved path within the flap 100. The arc-shaped guide slit 140 enables the flap 100 to provide a better wrapping effect on the instrument during insertion, ensuring smooth insertion and a tight fit with the flap 100, thus improving sealing. The arc-shaped guide slit 140 also helps the flap 100 maintain good elasticity during use, preventing damage to the flap 100 due to excessive stretching or uneven deformation, thereby further optimizing the structural design of the flap 100 and improving its practical application effect in the endoscope 10.

[0050] According to an optional embodiment, the slit 130 includes opposing first wall surfaces 131 and second wall surfaces 132, with interlocking structures 150 provided on the first wall surfaces 131 and second wall surfaces 132 to keep the slit 130 tightly closed after closure. This interlocking structure 150 design provides a better seal when no instrument is inserted, preventing gas or liquid from leaking through the slit 130 and ensuring the instrument channel is in a good sealed state when not in use, avoiding contamination or leakage. With this structure, the flap 100 can remain stably closed before instrument insertion, improving the sealing performance of the flap 100 and enhancing operational safety during use.

[0051] According to an optional embodiment, referring to Figures 2 and 3, the interlocking structure 150 includes a first protrusion 151 disposed on a first wall surface 131 and a second protrusion 152 disposed on a second wall surface 132 (refer to Figure 4). A first interlocking groove 153 is formed between the first protrusion 151 and the first wall surface 131, and a second interlocking groove 154 is formed between the second protrusion 152 and the second wall surface 132. The first interlocking groove 153 and the second interlocking groove 154 can interlock with each other after the slit 130 is closed, so that the slit 130 remains closed. It is understood that, referring to Figures 8 and 9, when the first interlocking groove 153 and the second interlocking groove 154 of the flap 100 come into contact with an instrument inserted into the slit 130, two sealing portions can be formed, namely a first sealing portion 155 and a second sealing portion 156, thereby providing a better sealing effect. This design not only improves the sealing effect, but also effectively reduces airflow leakage after instrument insertion, ensuring the airtightness of the instrument channel during operation.

[0052] Furthermore, the positioning of the first occlusal groove 153 and the second occlusal groove 154, located between two sealing parts, acts as a buffer when gas passes through, further reducing the vibration amplitude caused by deformation of the flap 100 or airflow fluctuations. This buffering effect helps reduce whistling sounds caused by flap 100 vibration, improves the stability of the endoscope 10 during use, reduces noise interference, and allows the surgeon to focus more on the task during operation, further improving the efficiency and safety of the surgery.

[0053] According to an optional embodiment, referring to Figures 2 and 5, the distance between the guide slit 140 and the first surface 110 near the first surface 110 gradually increases from the slit 130 side to the side away from the slit 130. That is, the depth of the guide slit 140 is deeper near the slit 130 and gradually becomes shallower away from the slit 130. This design allows the tearing force required for the guide slit 140 to gradually increase during the tearing process, facilitating a smoother tearing of the flap 100 during instrument insertion. This not only effectively controls the tearing process but also allows the flap 100 to maintain a certain degree of deformation after instrument insertion, avoiding excessive tearing and thus contributing to a better sealing effect. Because the design of the guide slit 140 allows the flap 100 to withstand a larger tearing force, the instrument can be inserted into the slit 130 more smoothly, reducing stress concentration after flap 100 deformation and keeping the flap 100 in a certain elastic state, thereby improving the sealing performance.

[0054] According to an optional embodiment, referring to Figures 1 and 2, the slit 130 extends along a first direction, and the thickness of the flap 100 gradually decreases from a position near the slit 130 towards both sides of the slit 130. In this embodiment, the first direction is the diametrical direction of the flap 100, that is, the slit 130 extends along the diametrical direction of the flap 100. With this design, the flap 100 has the greatest thickness in the direction in which the slit 130 extends, and gradually decreases towards both sides. This design allows the thickest part of the flap 100 to be subjected to pressure first when the instrument is inserted, avoiding excessive deformation of the flap 100 during insertion, thereby effectively avoiding air leakage problems that may occur after the flap 100 deforms. Specifically, when the instrument pushes the flap 100 to deform, the flap 100 deforms towards the side closer to the instrument tube 11a, forming a cone-shaped structure. Because the membrane flap 100 is thicker at the slit 130, it will abut against the inside of the slit 130 when deformed, thereby better wrapping the instrument, increasing the contact area, providing a better sealing effect, and preventing leakage.

[0055] According to an alternative embodiment, the flap 100 protrudes towards the first surface 110 near the slit 130, such that its thickness near the slit 130 is greater than its thickness away from the slit 130. This design helps the flap 100 provide stronger resilience during instrument insertion, maintaining a good seal between the instrument and the flap 100. Because the portion of the flap 100 near the slit 130 is thicker, it effectively prevents leakage due to deformation, providing additional sealing force.

[0056] According to an optional embodiment, referring to Figures 2 and 5, the flap 100 protrudes towards the second surface 120 near the slit 130, such that the thickness of the flap 100 near the slit 130 is greater than the thickness away from the slit 130. This design enhances the structural rigidity of the flap 100 and allows it to better seal the instrument channel when subjected to external forces, preventing fluid leakage and ensuring a tight seal.

[0057] Specifically, the first surface 110 of the flap 100 is composed of a first surface 111 and a second surface 112, and the intersection of the first surface 111 and the second surface 112 is the location of the slit 130. When an instrument is inserted into the slit 130, the first surface 111 and the second surface 112 deform towards the second surface 120. At this time, the intersection of the first surface 111 and the second surface 112 rotates or changes with the deformation of the flap 100. In this way, the first surface 111 and the second surface 112 gradually become parallel or overlap, allowing the flap 100 to make closer contact with the instrument during insertion, forming a better sealing effect. At the same time, when the instrument is removed, the area of ​​the second surface 120 of the flap 100 also provides a better seal for the instrument, thereby reducing the leakage that is prone to occur during instrument insertion and removal in conventional technologies.

[0058] It is understandable that the first surface 111, the second surface 112, the third surface 121, and the fourth surface 122 are planes intersecting the plane perpendicular to the central axis of the instrument tube 11a. During the insertion or withdrawal of the instrument tube 11a, the first surface 111 and the second surface 112, or the third surface 121 and the fourth surface 122, will gradually become parallel to the plane perpendicular to the central axis of the instrument tube 11a. Specifically, in the cross-section of the flap 100 perpendicular to the extension direction of the slit 130, the first surface 111 and the second surface 112 form the hypotenuse of a triangle, while the surface perpendicular to the central axis of the instrument tube 11a forms the right-angled side, and the thickness of the flap 100 forms the other right-angled side.

[0059] During the insertion of the instrument into the instrument tube 11a, the flap 100 on the beveled side gradually becomes parallel to the plane perpendicular to the central axis of the instrument tube 11a under the thrust of the instrument. Since the diameter of the flap 100 is fixed, it is forced to deform. This deformation causes the flap 100 at the slit 130 position to be compressed by the flap 100 at the beveled side, effectively enhancing the sealing effect. This design ensures that the flap 100 provides a higher level of sealing during instrument insertion or withdrawal, reducing the possibility of leakage and ensuring that bodily fluids within the instrument tube 11a are not easily leaked, thereby improving the safety and hygiene of the surgical procedure.

[0060] Furthermore, due to the presence of the third surface 121 and the fourth surface 122, the flap 100 is less prone to excessive deformation or vibration under airflow. Airflow typically causes deformation of the flap 100, resulting in vibration and noise that affects the surgical environment. This design strengthens the structure of the flap 100; the support of the third surface 121 and the fourth surface 122 helps the flap 100 maintain better shape stability under airflow, reducing vibration and noise. Therefore, this structural design not only improves the sealing effect of the flap 100 but also effectively reduces noise caused by flap 100 vibration, thus providing a more stable surgical environment. This allows surgeons to focus more on their procedures, improving surgical efficiency and precision.

[0061] The second aspect of this embodiment describes a biopsy valve in detail.

[0062] Referring to Figures 6 and 7, a biopsy valve includes the flap 100 of the above embodiment. The biopsy valve 12 includes a port 12a for communicating with an instrument tube 11a. The flap 100 is disposed at the port 12a to close the port 12a. When an instrument needs to be inserted through the port 12a, the flap 100 is expanded during the instrument insertion process, thereby allowing the instrument to pass smoothly. After the instrument passes through, the flap 100 can return to its original shape, closing the port 12a and preventing leakage of bodily fluids or external contaminants from entering the instrument tube 11a.

[0063] Referring to Figures 8 and 9, the design of the biopsy valve 12 ensures that the port 12a is completely sealed when no instrument is inserted, thereby preventing gas or liquid leakage. The slit 130 design and guide slit 140 function of the flap 100 effectively guide the deformation of the flap 100 during instrument insertion, maintaining a seal. Furthermore, due to the rigidity and optimized structure of the flap 100, vibration-induced noise, such as whistling, is effectively reduced, resulting in a smoother surgical procedure. In addition, the thickness design of the flap 100, especially the thicker portion at the slit 130, enhances the flap 100's resistance to deformation, improves sealing performance, and reduces resistance during instrument insertion, ensuring smooth entry of the instrument into the port 12a.

[0064] With this design, the biopsy valve 12 not only provides a good sealing effect, but also effectively controls the deformation of the instrument during insertion, avoids unnecessary leakage or damage, and reduces noise caused by vibration during the operation, which helps to improve the safety and comfort of the operation.

[0065] The third aspect of this embodiment describes an endoscope in detail.

[0066] Referring to Figures 7 and 10, an endoscope includes a handle 13 and an insertion portion 11. The insertion portion 11 is provided with an instrument tube 11a, and also includes a biopsy valve 12 as described in the above embodiment. The biopsy valve 12 is disposed on the handle 13 and communicates with the instrument tube 11a. This gives the endoscope 10 the beneficial effects of the aforementioned biopsy valve 12, which will not be described in detail here.

Claims

1. A flap for use in an endoscope (10), the endoscope (10) comprising an instrument tube (11a) and a biopsy valve (12) communicating with the instrument tube (11a), characterized in that, The flap (100) is disposed on the biopsy valve (12). The flap (100) has a first surface (110) and a second surface (120). The second surface (120) faces the instrument tube (11a), and the first surface (110) is located on the side opposite to the second surface (120). The flap (100) is provided with a slit (130) and a guide slit (140). The slit (130) penetrates the first surface (110) and the second surface (120). The guide slit (140) is connected to the slit (130) and extends from the slit (130) to the side away from the slit (130). The guide slit (140) only penetrates the second surface (120) and does not penetrate the first surface (110). The thickness of the flap (100) at the slit (130) is greater than the thickness of the rest of the flap (100); The slit (130) includes a first wall (131) and a second wall (132) opposite to each other, and the first wall (131) and the second wall (132) are provided with an interlocking structure (150) so that the slit (130) remains tightly closed by the interlocking structure (150) after it is closed; The occlusal structure (150) includes a first protrusion (151) disposed on the first wall surface (131) and a second protrusion (152) disposed on the second wall surface (132). A first occlusal groove (153) is formed between the first protrusion (151) and the first wall surface (131), and a second occlusal groove (154) is formed between the second protrusion (152) and the second wall surface (132). The ends of the first protrusion (151) and the second protrusion (152) are misaligned in the axial direction of the flap (100). The first occlusal groove (153) and the second occlusal groove (154) can occlude with each other after the slit (130) is closed, so that the slit (130) remains closed. The slit (130) meanders from the end of the first protrusion (151) to the end of the second protrusion (152).

2. The membrane flap according to claim 1, characterized in that, The depth of the guide slit (140) gradually decreases from the side closer to the slit (130) to the side farther away from the slit (130).

3. A membrane flap according to claim 1, characterized in that, The guide slit (140) extends from the end of the slit (130) to both sides of the slit (130).

4. A membrane flap according to claim 1, characterized in that, The guide seam (140) is arc-shaped.

5. A membrane flap according to claim 1, characterized in that, The distance of the guide slit (140) from the first surface (110) on the side closer to the first surface (110) gradually increases from the slit (130) side to the side farther away from the slit (130).

6. A membrane flap according to claim 1, characterized in that, The slit (130) extends along a first direction, and the thickness of the flap (100) gradually decreases from a position close to the slit (130) toward both sides of the slit (130).

7. A membrane flap according to claim 1 or 6, characterized in that, The flap (100) protrudes toward the first surface (110) near the slit (130) so that the thickness near the slit (130) is greater than the thickness away from the slit (130).

8. A membrane flap according to claim 1 or 6, characterized in that, The flap (100) protrudes toward the second surface (120) near the slit (130) so that the thickness of the flap (100) near the slit (130) is greater than the thickness away from the slit (130).

9. A biopsy valve, characterized in that, The biopsy valve (12) includes a flap (100) according to any one of claims 1-8, the flap (100) being disposed at the flap (12a) to close the flap (12a).

10. An endoscope, characterized in that, It includes a handle (13) and an insertion part (11), the insertion part (11) being provided with an instrument tube (11a), and also includes a biopsy valve (12) as described in claim 9, the biopsy valve (12) being disposed on the handle (13) and communicating with the instrument tube (11a).

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