Suction valve and endoscope

Abstract

The present invention provides a suction valve and an endoscope, wherein the suction valve includes a valve body and a valve core, wherein the bottom end of the valve body is provided with an air port connected to the outside, and an inlet and an outlet are provided on the side wall opposite to each other; when the valve core extends into the installation cavity of the valve body to block the air port, the inlet is connected to the outlet via the annular groove; when the valve core extends out of the installation cavity and detaches from the air port, the air port is connected to the outlet to form a gas channel. The present application overcomes the technical bias in the prior art to avoid opening holes on the valve body in order to ensure sealing. By providing an air port at the bottom end of the valve body, when the suction valve is in a non-working state, the air port can quickly establish a gas channel with the outlet on the valve body. Compared with the traditional suction valve forming a gas channel inside the valve core, the gas channel of the suction valve of the present application is shorter, so that the suction valve reacts quickly as a whole and has high sensitivity, which can ensure the timely suction of body fluids and diseased tissues when the suction valve is in the working state, and effectively ensure the surgical progress and surgical effect of the endoscope.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a suction valve and an endoscope. Background Art

[0002] Endoscopes are commonly used detection instruments in modern medical diagnosis and treatment. They can enter the stomach through the mouth or other natural channels, or enter the human body through an incision made during surgery. Through endoscopes, doctors can observe lesions in the human body that cannot be shown by X-rays, which is beneficial for subsequent diagnosis of the disease.

[0003] In the endoscope, the suction valve cooperates with the suction tube to suck the accumulated fluid in the patient's body to eliminate the interference of the accumulated fluid during the examination and treatment process and ensure the doctor's observation field. In the specific operation, the suction valve button is operated to connect the port of the suction valve with the suction valve to form a negative pressure channel to suck out the body fluid of the diseased tissue in the body and the removed diseased tissue.

[0004] At present, when the suction valve button in the endoscope is released from the pressed state, the outside air enters the suction pump through the hole on the suction valve button to increase the pressure inside the suction pump. The gas channel is from the opening at the top of the valve core to the outlet at the bottom of the valve body. The gas channel almost runs through the entire suction valve. Its length is relatively long, which can easily lead to slow reaction and low sensitivity of the suction valve, and cannot ensure the timely suction of body fluids and diseased tissues, affecting the progress and effect of the operation. Summary of the invention

[0005] The purpose of the present invention is to solve the technical problems that the gas channel of the suction valve in the endoscope of the prior art is long, the suction valve has low sensitivity, and cannot ensure the timely suction of body fluids and diseased tissues, thus affecting the progress and effect of the operation.

[0006] In order to solve the above technical problems, the present invention provides a suction valve, which includes a valve body and a valve core, and the interior of the valve body is provided with an installation cavity; the top end of the valve body is provided with an opening, and the bottom end is provided with an air port connected to the outside, and the opening is connected with the air port via the installation cavity; an inlet and an outlet are relatively opened on the side wall of the valve body, and the inlet and the outlet have a height difference; the bottom end of the valve core is telescopically arranged in the installation cavity through the opening of the valve body, and an annular groove is formed on the side wall of the bottom end of the valve core; when the valve core is extended into the installation cavity to block the air port, the inlet is connected with the outlet via the annular groove; when the valve core is extended out of the installation cavity and detached from the air port, the air port is connected with the outlet to form a gas channel.

[0007] Optionally, in the height direction of the valve body, the distance between the outlet and the gas port is smaller than the distance between the inlet and the gas port.

[0008] Optionally, the cross-sectional area of ​​the bottom end of the valve core is larger than the size of the air port.

[0009] Optionally, a length of the annular groove in a height direction of the valve core is greater than a height difference between the inlet and the outlet.

[0010] Optionally, the valve core is provided with annular installation grooves at both ends of the annular groove, and a step-like structure is formed between the installation groove and the annular groove; an annular sealing ring is provided in the installation groove, and the peripheral side of the sealing ring abuts against the inner wall of the valve body.

[0011] Optionally, the sealing ring includes a main body and at least one raised portion arranged around the main body, the main body is snap-fitted into the mounting groove, and an end of the raised portion abuts against an inner wall of the valve body.

[0012] Optionally, the suction valve also includes a transition piece, which is arranged at the opening of the valve body, and the transition piece is provided with a through hole corresponding to the opening; the transition piece forms a boss at the through hole, and the boss surrounds the opening of the valve body and protrudes inward to partially cover the opening of the valve body.

[0013] Optionally, the suction valve further comprises a valve cap, wherein the valve cap is fixed on the top end of the valve core, and an accommodating cavity is provided inside the valve cap.

[0014] Optionally, the suction valve further comprises a spring, wherein the spring is fixed in the accommodating cavity of the valve bonnet, one end of the spring abuts against the inner surface of the valve bonnet, and the other end of the spring abuts against the surface of the transition piece.

[0015] The present invention also provides an endoscope, comprising an operating member, an inserting member, and a connecting member connected between the operating member and the inserting member. The endoscope also comprises a suction tube, which is passed through the inserting member and the connecting member. The operating member comprises the above-mentioned suction valve, and the inlet of the suction valve is connected to the suction tube so that the suction valve controls the on and off of the suction tube.

[0016] It can be seen from the above technical solution that the beneficial effects of the present invention are:

[0017] The suction valve and endoscope of the present invention overcome the technical bias in the prior art to avoid opening holes in the valve body in order to ensure sealing. By arranging an air port at the bottom end of the valve body, when the suction valve is in a non-working state, the air port can quickly establish a gas channel with the outlet on the valve body. Compared with the traditional suction valve that forms a gas channel inside the valve core, the gas channel of the suction valve of the present application is shorter, so that the suction valve as a whole responds quickly and has high sensitivity, which can ensure the timely suction of body fluids and diseased tissues when the suction valve is in a working state, and effectively ensure the surgical progress and surgical effect of the endoscope. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of an embodiment of an endoscope of the present invention;

[0019] Figure 2 yes Figure 1 A schematic diagram of the structure of the valve body and valve core of the suction valve in the endoscope shown;

[0020] Figure 3 yes Figure 1 A cross-sectional view of the endoscope in which the suction valve is in use;

[0021] Figure 4 yes Figure 3 A cross-sectional view of the endoscope in which the suction valve is not in use;

[0022] Figure 5 yes Figure 1 Another structural schematic diagram of the valve body and valve core of the suction valve in the endoscope shown;

[0023] Figure 6 yes Figure 1 Another structural schematic diagram of the valve body and valve core of the suction valve in the endoscope shown;

[0024] Figure 7 It is a cross-sectional view of a suction valve in another embodiment of the endoscope of the present invention in a non-use state.

[0025] The description of the accompanying drawings is as follows: 100, endoscope; 10, operating part; 20, insert; 30, connecting part; 11, suction valve; 12, valve body; 120, installation cavity; 121, opening; 122, air port; 123, inlet; 124, outlet; 125, convex edge; 13, valve core; 131, annular groove; 132, installation groove; 14, transition piece; 141, boss; 15, sealing ring; 151, main body; 152, raised part; 16, valve cap; 17, spring; 18, sealing structure; 181, sealing part; 19, metal structure. DETAILED DESCRIPTION

[0026] Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations therein are essentially used for illustration purposes rather than for limiting the present invention.

[0027] In order to further illustrate the principle and structure of the present invention, preferred embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0028] Unless otherwise specified, regardless of the placement of the endoscope, the two ends of the suction valve in the height direction in the present application are the top end and the bottom end respectively.

[0029] See also Figures 1 to 3 The present application provides an endoscope 100, which can be used to observe the pathological conditions of organs in the human body and can suck out body fluids of diseased tissues in the body and the removed diseased tissues.

[0030] The endoscope 100 of this embodiment includes an operating member 10, an inserting member 20, a connecting member 30 and a suction tube (not shown in the figure). The inserting member 20 is used to be inserted into the human body. The head end of the inserting member 20 is provided with a camera to obtain images of the human body so that medical staff can clearly identify the location of the diseased tissue.

[0031] The operating member 10 is used by medical personnel to operate the endoscope 100 outside the patient's body to achieve overall control of the endoscope 100. The connecting member 30 is connected between the inserting member 20 and the operating member 10. The connecting member 30 can not only connect the inserting member 20 and the operating member 10, but also adjust the rotation angle of the inserting member 20 so that the tip of the inserting member 20 is accurately close to the lesion site.

[0032] The suction tube is inserted into the insert 20 and the connector 30 to form an independent channel inside the endoscope 100. One end of the suction tube is connected to the port at the head end of the insert 20 so that the suction tube is connected to the external environment. The suction tube is a plastic tube with toughness, which can be made of materials such as polyvinyl chloride, thermoplastic polyurethane elastomer rubber or polytetrafluoroethylene.

[0033] like Figures 2 to 4 As shown, in this embodiment, the operating member 10 includes a suction valve 11. The suction valve 11 is used to cooperate with the suction tube to suck out the body fluid of the diseased tissue inside the human body and the removed diseased tissue.

[0034] Specifically, the suction valve 11 of this embodiment includes a valve body 12 and a valve core 13. The valve body 12 has an installation cavity 120 disposed therein. The valve body 12 has an opening 121 disposed at the top end thereof and an air port 122 disposed thereat to communicate with the outside world. The opening 121 communicates with the air port 122 via the installation cavity 120. An inlet 123 and an outlet 124 are disposed on the side wall of the valve body 12, and there is a height difference between the inlet 123 and the outlet 124.

[0035] The bottom end of the valve core 13 is telescopically inserted into the installation cavity 120 through the opening 121 of the valve body 12, and a ring groove 131 is formed on the side wall of the bottom end of the valve core 13. When the valve core 13 extends out of the installation cavity 120 and leaves the gas port 122, the gas port 122 is connected to the outlet 124 to form a gas channel.

[0036] Further, in this embodiment, the main body of the valve body 12 is cylindrical, and its interior is hollow to form an installation cavity 120. The top of the valve body 12 is provided with an opening 121, and the opening 121 can roughly cover the cross section of the top of the valve body 12. The bottom of the valve body 12 is provided with an air port 122, and the air of the external environment can enter the installation cavity 120 of the valve body 12 through the air port 122.

[0037] The opening 121 on the valve body 12 is coaxially arranged with the air port 122, and the air port 122 is smaller than the opening 121. The valve core 13 can extend into the installation cavity 120 of the valve body 12 through the opening 121. When the bottom end of the valve core 13 contacts the bottom of the valve body 12, the valve core 13 can block the air port 122 at the bottom end of the valve body 12, thereby achieving sealing of the air port 122.

[0038] The side wall of the valve body 12 is also provided with an inlet 123 and an outlet 124, which are arranged opposite to each other. The inlet 123 and the outlet 124 can be connected to branches respectively, so as to form corresponding circulation channels. Among them, the inlet 123 is connected to the suction tube through the branch to communicate with the internal environment of the human body. The body fluid of the diseased tissue inside the human body and the removed diseased tissue can enter the installation cavity 120 through the suction tube and the inlet 123 of the valve body 12.

[0039] The outlet 124 can be connected to an external suction pump through a branch. When the suction valve 11 is working, the body fluid or diseased tissue sucked out by the suction tube can pass through the mounting cavity 120 inside the valve body 12 and finally enter the suction pump through the outlet 124 of the valve body 12, thereby completing the discharge of the body fluid of the diseased tissue and the excised diseased tissue.

[0040] In the valve body 12 of this embodiment, the diameter of the branch connected to the inlet 123 is larger than the diameter of the branch connected to the outlet 124. This arrangement can ensure that the body fluid and diseased tissue in the human body can smoothly enter the installation cavity 120 inside the valve body 12, and can ensure that the suction pump can stably suck out the body fluid and diseased tissue flowing through the valve body 12.

[0041] In the height direction of the valve body 12, the distance between the outlet 124 and the gas port 122 is smaller than the distance between the inlet 123 and the gas port 122, that is, the outlet 124 is arranged closer to the gas port 122. When the valve core 13 extends outward from the opening 121 of the valve body 12, the valve core 13 gradually separates from the gas port 122 and the outlet 124, and stops at the inlet 123, so that the gas port 122 is connected with the outlet 124 to form a gas channel, and the gas channel is connected to the suction pump through the branch at the outlet 124.

[0042] By setting an air port 122 at the bottom end of the valve body 12, when the suction valve 11 is in a non-working state, the air port 122 can quickly establish a gas channel with the outlet 124 on the valve body 12. Compared with the traditional suction valve that forms a gas channel inside the valve core, the gas channel of the suction valve 11 of the present application is shorter, so that the suction valve 11 as a whole responds quickly and has high sensitivity, which can ensure the timely suction of body fluids and diseased tissues when the suction valve 11 is in a working state, and effectively ensure the surgical progress and surgical effect of the endoscope 100.

[0043] In addition, the opening 121 of the valve body 12 is bent outward to form a convex edge 125, which is arranged along the periphery of the opening 121 of the valve body 12. The convex edge 125 forms a step-like structure at the opening 121 of the valve body 12, which constitutes the installation area of ​​the valve body 12 for matching and connecting with other related components.

[0044] In this embodiment, the suction valve 11 further includes a transition piece 14. The transition piece 14 is disposed at the convex edge 125 of the valve body 12, and the transition piece 14 is provided with a through hole corresponding to the opening 121 of the valve body 12, and the valve core 13 can extend into the installation cavity 120 of the valve body 12 through the through hole of the transition piece 14 and the opening 121 of the valve body 12.

[0045] The transition piece 14 of this embodiment is formed with a boss 141 at its through hole. The boss 141 surrounds the opening 121 of the valve body 12 and protrudes inward to partially cover the opening 121 of the valve body 12. The arrangement of the boss 141 on the transition piece 14 can limit the upward extension stroke of the valve core 13, avoid the valve core 13 completely coming out of the valve body 12 due to excessive force, etc., and ensure the stability of the overall structure of the suction valve 11.

[0046] Furthermore, the valve core 13 of this embodiment is substantially columnar and solid in structure. The bottom end of the valve core 13 is inserted into the mounting cavity 120 of the valve body 12, and when the bottom end of the valve core 13 blocks the bottom air port 122 of the valve body 12, the top end of the valve core 13 extends outward beyond the opening 121 of the valve body 12.

[0047] In this embodiment, an annular groove 131 is formed on the side wall of the bottom end of the valve core 13. The valve core 13 is further provided with an annular mounting groove 132 at both ends of the annular groove 131, and a step-like structure is formed between the mounting groove 132 and the annular groove 131. The annular groove 131 of this embodiment can be formed by a step structure of two adjacent mounting grooves 132.

[0048] In addition, if Figure 5 As shown, the annular groove 131 can also be directly opened on the side wall of the valve core 13. In this case, the side wall of the valve core 13 forms a seal with the valve body 12 through the metal structure 19. Figure 6A full-length sealing structure 18 can be sleeved on the side wall of the valve core 13. The two ends of the sealing structure 18 have protruding sealing parts 181. The sealing parts 181 contact with the valve body 12 to seal. The sealing parts 181 at both ends of the sealing structure 18 form an annular groove 131 on the side wall of the valve core 13.

[0049] The mounting grooves 132 at both ends of the annular groove 131 are provided with sealing rings 15, which are annular in shape. The circumference of the sealing ring 15 abuts against the inner wall of the mounting cavity 120 of the valve body 12 to strictly seal, so that the area between the two sealing rings 15 forms an independent sealed space.

[0050] When the valve core 13 extends into the installation cavity 120 and blocks the air port 122 of the valve body 12, the sealing ring 15 close to the bottom end of the valve core 13 is located below the outlet 124 of the valve body 12, and the other sealing ring 15 is located above the inlet 123 of the valve body 12, thereby isolating the area around the annular groove 131 from other areas in the installation cavity 120 of the valve body 12, so that the inlet 123 of the valve body 12 is connected with the opening 121 through the annular groove 131.

[0051] In this embodiment, the sealing ring 15 includes a main body 151 and at least one protrusion 152 arranged around the main body 151. The main body 151 is clamped in the mounting groove 132, and the end of the protrusion 152 abuts against the inner wall of the valve body 12 to achieve segmented sealing of the mounting cavity 120 inside the valve body 12.

[0052] In this embodiment, there are multiple protrusions 152, which are arranged at intervals in the height direction of the main body 151, so that the outer edge of the sealing ring 15 is serrated. The end of each protrusion 152 abuts against the inner wall of the valve body 12 to ensure sealing. Figure 7 As shown, the protrusion 152 can also be set as one, and the protrusion 152 forms an annular protrusion on the circumference of the main body. The contact area between the protrusion 152 and the inner wall of the valve body 12 is large to ensure sealing and prevent leakage of gas or liquid. It should be noted that the sealing ring 15 can also be other deformed structures as long as the sealing can be ensured.

[0053] like Figure 3 and Figure 4 As shown, when the valve core 13 blocks the air port 122 and the inlet 123 of the valve body 12 is connected with the opening 121 via the annular groove 131, a liquid channel can be formed inside the suction valve 11, and the suction tube placed inside the human body is connected with the suction pump at the outlet 124 of the valve body 12 via the liquid channel.

[0054] The body fluids and diseased tissues produced by the diseased tissues in the human body can pass through the suction tube and enter the liquid channel via the inlet 123 on the valve body 12, and then flow into the suction pump from the outlet 124 of the valve body 12, thereby achieving the discharge of the body fluids and diseased tissues in the body.

[0055] When the top end of the valve core 13 extends out of the installation cavity 120, the bottom end of the valve core 13 is free from the blockage of the gas port 122 at the bottom of the valve body 12. When the step structure at the installation groove 132 near the top of the valve core 13 abuts against the boss 141 of the transition piece 14, the upward extension stroke of the valve core 13 is limited. At this time, the sealing ring 15 near the bottom end of the valve core 13 is located above the outlet 124 of the valve body 12 to isolate the inlet 123 of the valve body 12 to another area of ​​the installation cavity 120, so that the gas port 122 at the bottom of the valve body 12 is connected with the outlet 124 on the side wall, so that the gas channel is formed.

[0056] After the gas channel is formed, air in the external environment can enter the interior of the valve body 12 through the gas port 122, and enter the suction pump connected to the outlet 124 through the gas channel, ensuring the stability of the suction pump when the suction valve 11 is not in operation.

[0057] Furthermore, the suction valve 11 of the present embodiment further comprises a valve cap 16, which is fixed to the top of the valve core 13, and a receiving cavity is provided inside the valve cap 16. In the present embodiment, a thread is provided on the peripheral side of the top of the valve core 13, and the valve cap 16 is screwed and fixed to the valve core 13. In addition to the screw fixing method, the valve cap 16 can also be directly clamped or bonded to the top of the valve core 13.

[0058] The suction valve 11 of this embodiment further includes a spring 17, which is clamped in the accommodating cavity of the valve cap 16. When the spring 17 is adapted to be installed in the valve cap 16, one end of the spring 17 abuts against the inner surface of the valve cap 16, and the other end abuts against the surface of the boss 141 of the transition piece 14.

[0059] When the valve cap 16 is pressed down to make the bottom end of the valve core 13 block the air port 122 of the valve body 12, the valve cap 16 squeezes the spring 17, causing the spring 17 to produce elastic deformation. When the pressure on the valve cap 16 is released, the valve core 13 bounces upward under the elastic force generated by the elastic deformation of the spring 17, and the step structure at the mounting groove 132 near the top of the valve core 13 abuts against the boss 141 of the transition piece 14, so that the valve core 13 is separated from the air port 122 of the valve body 12.

[0060] See also Figure 3When the suction valve 11 of this embodiment is in working state, that is, when the diseased tissue in the human body and the body fluids produced by it need to be discharged from the body, the valve cap 16 is pressed downward until the bottom end of the valve core 13 blocks the air port 122 of the valve body 12. At this time, the sealing rings 15 at both ends of the annular groove 131 of the valve core 13 respectively seal the space above the inlet 123 and below the outlet 124 of the valve body 12, so that the area around the annular groove 131 is isolated from other areas in the installation cavity 120, so that the inlet 123 is connected with the outlet 124 through the annular groove 131.

[0061] Under the action of the suction pump, the diseased tissue in the human body and the body fluid produced by it enter the annular groove 131 area through the suction tube and the inlet 123 on the valve body 12, and then enter the suction pump through the outlet 124, thereby achieving the discharge of body fluid and diseased tissue.

[0062] like Figure 4 As shown, after the body fluid and diseased tissue are discharged, the suction valve 11 and the suction pump return to the non-working state, the pressure on the valve cap 16 is released, and the valve core 13 bounces upward until the step structure at the mounting groove 132 near the top of the valve core 13 abuts against the boss 141 of the transition piece 14. At this time, the bottom end of the valve core 13 is separated from the blockage of the air port 122 of the valve body 12, and the sealing ring 15 arranged near the bottom end of the valve core 13 seals between the inlet 123 and the outlet 124 of the valve body 12, so that the air port 122 is connected with the outlet 124 to form a gas channel.

[0063] After the gas channel is formed, air in the external environment enters the interior of the valve body 12 through the gas port 122, and then enters the suction pump connected to the outlet 124 through the outlet 124 to ensure the stability of the suction pump in a non-working state.

[0064] The suction valve and endoscope of the present embodiment overcome the technical bias in the prior art to avoid opening holes in the valve body in order to ensure sealing. By setting an air port at the bottom end of the valve body, when the suction valve is in a non-working state, the air port can quickly establish a gas channel with the outlet on the valve body. Compared with the traditional suction valve that forms a gas channel inside the valve core, the gas channel of the suction valve of the present application is shorter, so that the suction valve as a whole responds quickly and has high sensitivity, which can ensure the timely suction of body fluids and diseased tissues when the suction valve is in a working state, and effectively ensure the surgical progress and surgical effect of the endoscope.

[0065] Although the present invention has been described with reference to several typical embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the present invention can be embodied in a variety of forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims, so all changes and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A suction valve, characterized in that: include: A valve body, with an installation cavity inside; an opening is provided at the top of the valve body, and an air port communicating with the outside is provided at the bottom of the valve body, and the opening is communicated with the air port via the installation cavity; an inlet and an outlet are relatively opened on the side wall of the valve body, and the inlet and the outlet have a height difference, and the outlet is used to connect with an external suction pump; in the height direction of the valve body, the distance between the outlet and the air port is smaller than the distance between the inlet and the air port; A valve core, the bottom end of which is telescopically arranged in the installation cavity through the opening of the valve body, an annular groove is formed on the side wall of the bottom end of the valve core, and the area of ​​the cross-section of the bottom end of the valve core is larger than the size of the gas port; when the valve core is extended into the installation cavity to block the gas port, the inlet is connected with the outlet via the annular groove; when the valve core is extended out of the installation cavity and separated from the gas port, the gas port is connected with the outlet to form a gas channel; Wherein, the suction valve further comprises a valve cap, and the valve cap is fixed on the top end of the valve core; When the suction valve is in working state and the diseased tissue and body fluid in the human body are discharged from the body, the valve cap is pressed downward until the bottom end of the valve core blocks the air port of the valve body, so that the inlet is connected with the outlet, and the diseased tissue and body fluid in the human body are discharged from the outlet under the action of the suction pump; The suction valve returns to a non-working state when the diseased tissue and body fluid are discharged, and the pressure on the valve cap is released, so that the valve core pops up and extends out to disengage from the blockage of the air port of the valve body, so that the air port is connected to the outlet to form the gas channel, so that air in the external environment can enter the valve body through the air port, and enter the connected suction pump through the outlet.

2. The suction valve according to claim 1, characterized in that: The length of the annular groove in the height direction of the valve core is greater than the height difference between the inlet and the outlet.

3. The suction valve according to claim 1, characterized in that: The valve core is provided with annular mounting grooves at both ends of the annular groove, and a step-like structure is formed between the mounting grooves and the annular groove; an annular sealing ring is provided in the mounting groove, and the peripheral side of the sealing ring abuts against the inner wall of the valve body.

4. The suction valve according to claim 3, characterized in that: The sealing ring comprises a main body and at least one protruding portion arranged around the main body, the main body is clamped in the mounting groove, and an end of the protruding portion abuts against an inner wall of the valve body.

5. The suction valve according to claim 1, characterized in that: The suction valve also includes a transition piece, which is arranged at the opening of the valve body, and the transition piece is provided with a through hole corresponding to the opening; the transition piece forms a boss at the through hole, and the boss surrounds the opening of the valve body and protrudes inward to partially cover the opening of the valve body.

6. The suction valve according to claim 5, characterized in that: An accommodating cavity is arranged inside the valve cap.

7. The suction valve according to claim 6, characterized in that: The suction valve further comprises a spring, which is fixed in the accommodating cavity of the valve cap, one end of the spring abuts against the inner surface of the valve cap, and the other end of the spring abuts against the surface of the transition piece.

8. An endoscope, comprising an operating member, an inserting member, and a connecting member connected between the operating member and the inserting member, the endoscope further comprising a suction tube, the suction tube being inserted through the inserting member and the connecting member, characterized in that: The operating member comprises a suction valve as described in any one of claims 1 to 7, and an inlet of the suction valve is connected to the suction tube so that the suction valve controls the on-off of the suction tube.

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