Negative pressure suction nozzle, driving mechanism, and endoscope

Abstract

The application relates to the technical field of endoscopes, in particular to a negative pressure suction nozzle, a driving mechanism and an endoscope. The endoscope comprises a base body, the base body comprises a fluid output end, a fluid input end, a first limiting part and a rotating fitting part, the first limiting part is located between the fluid output end and the fluid input end, the first limiting part is used for abutting and cooperating with the inner wall of a handle shell, the rotating fitting part is arranged on the inner side of the first limiting part along the third direction of the base body, and the rotating fitting part is used as the rotating shaft of a traction wheel and is used for rotatingly cooperating with the traction wheel. The negative pressure suction nozzle for realizing the negative pressure controllable suction function is integrated into the functional assembly for realizing the far-end bending controllable function of the insertion part, so that the two functional assemblies are integrated, the number of basic components constituting the endoscope is simplified, the assembly process is reduced, and the assembly difficulty is reduced. Therefore, on the basis of ensuring the negative pressure controllable suction function, the bending controllable function and the corresponding operation habit, the production cost of the endoscope is reduced.

Description

Technical Field

[0001] This invention relates to the field of endoscopy technology, and more particularly to a negative pressure suction nozzle, a drive mechanism, and an endoscope. Background Technology

[0002] An endoscope is a medical device that allows direct access to human cavities for examination, providing doctors with comprehensive diagnostic information. An endoscope typically includes: an insertion section for insertion into the body, a handle for controlling the bending of the insertion section's tip, and a display device for showing the internal environment of the body's natural cavities. Through the coordination of these three parts, the endoscope enables visualization of the body's interior, exploration of lesions, and treatment. The handle is equipped with a negative pressure suction nozzle and a suction valve. The negative pressure suction nozzle, through the suction valve, connects to the fluid channel (usually the instrument channel) in the insertion section, creating a negative pressure suction channel for aspirating samples from the body's natural cavities. For example, a suction endoscope can be inserted into the lungs to aspirate fluid.

[0003] On the other hand, disposable endoscopes help avoid the risk of cross-infection. However, the production cost of disposable endoscopes has a significant impact on their application and promotion. How to reduce the production cost of endoscopes while ensuring their full functionality is a problem that needs to be solved. Summary of the Invention

[0004] The purpose of this application is to provide a negative pressure suction nozzle, a drive mechanism, and an endoscope to solve the aforementioned technical problems existing in the prior art.

[0005] This application is implemented as follows:

[0006] In a first aspect, this application provides a negative pressure suction nozzle for use in an endoscope, comprising a substrate, said substrate comprising:

[0007] A fluid output end is provided along a first direction of the substrate and is used to connect to a negative pressure source.

[0008] A fluid input end is provided along the second direction of the substrate. The fluid input end is used to connect to the instrument tube. The fluid input end is connected to the fluid output end through a fluid channel provided in the substrate.

[0009] The first limiting part is located between the fluid output end and the fluid input end. The first limiting part is used to abut against the inner wall of the handle housing to constrain the length of the fluid output end extending out of the handle housing.

[0010] A rotating engagement part is provided inside the first limiting part along a third direction of the base. The rotating engagement part is used as the rotating shaft of the traction wheel and rotates with the traction wheel. The first direction, the second direction and the third direction are opposite to each other.

[0011] Secondly, this application provides a driving mechanism for use in an endoscope, including a lever, a traction wheel, and the aforementioned negative pressure suction nozzle. The lever is connected to the traction wheel, and the traction wheel has a shaft hole that is coaxially rotatably engaged with the rotating fitting part. The traction wheel also has a mounting part for mounting a traction rope.

[0012] Thirdly, this application provides an endoscope including a handle and an insertion part, wherein the proximal end of the insertion part is connected to the distal end of the handle, the endoscope further includes the aforementioned negative pressure suction nozzle or the aforementioned driving mechanism, the fluid input end, the rotating mating part and the first limiting part are disposed in the handle housing, and the fluid output end extends at least partially out of the handle housing.

[0013] The technical solution provided in this application can achieve the following beneficial effects:

[0014] This application integrates the negative pressure suction nozzle, which is responsible for realizing the negative pressure controllable suction function, into the functional component that realizes the distal bending controllable function of the insertion part. This merges the two functional components, simplifies the number of basic components constituting the endoscope, reduces assembly steps, and lowers assembly difficulty. In this way, while ensuring that the negative pressure controllable suction function, the bending controllable function, and the corresponding operating habits remain unchanged, the production cost of the endoscope is reduced. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the negative pressure suction nozzle of this application;

[0017] Figure 2 This is a schematic diagram of the internal structure of the negative pressure suction nozzle of this application;

[0018] Figure 3 This is a schematic diagram of the drive mechanism (first state) of this application;

[0019] Figure 4 This is a schematic diagram of the drive mechanism (second state) of this application;

[0020] Figure 5This is an exploded view of the drive mechanism of this application;

[0021] Figure 6 This is a schematic diagram of the internal structure of the lever in this application;

[0022] Figure 7 This is a schematic diagram of the endoscope in this application;

[0023] Figure 8 This is a schematic diagram of the structure from another perspective of the endoscope in this application;

[0024] Figure 9 yes Figure 8 A magnified view of a section at point A in the middle;

[0025] Figure 10 This is a schematic diagram of the internal structure of the handle in this application.

[0026] In the picture:

[0027] 10. Handle; 100. Base; 110. Fluid output end; 120. Fluid input end; 130. Rotating mating part; 131. Stop surface; 140. First limiting part; 150. Second limiting part; 161. Mounting hole; 162. Mating part; 163. Strip groove; 200. Traction wheel; 300. Lever; 310. Operating part; 311. Mounting groove; 320. Connecting part; 321. Sliding groove; 322. Through hole; 331. Elastic element; 332. Rod body; 333. Friction element; 334. Inclined surface; 400. Suction valve; 500. Y-type connector; 20. Insertion part. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0029] In the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0030] In various embodiments of this application, "proximal end" and "distal end" refer to the position of the endoscope and its accessories relative to the user in the usage environment. The end closer to the user is designated as the "proximal end", and the end farther from the user is designated as the "distal end".

[0031] Endoscopes have been used in medical surgery for a long time. Operators have developed mature and stable operating experience in dealing with different surgical situations using endoscopes. If operating habits are changed due to changes in the structure of the endoscope, the probability of misoperation may increase the surgical risk. Therefore, it is necessary to reduce the production cost of endoscopes while ensuring that the usage habits and basic functions of the endoscopes remain unchanged. This is especially true for suction endoscopes, which need to retain their controllable negative pressure suction function and operating habits. However, existing suction endoscopes generally retain both the controllable bending function of the distal insertion part and the controllable negative pressure suction function. These two functions are two independent functional components that need to be assembled separately, which leads to complex assembly processes and excessive assembly time, making it difficult to reduce the production cost of endoscopes. To this end, this application provides a negative pressure suction nozzle, a drive mechanism, and an endoscope. The negative pressure suction nozzle, which participates in realizing the negative pressure controllable suction function, is integrated into a functional component that realizes the distal bending controllable function of the insertion part. This integrates the two functional components, simplifies the number of basic components constituting the endoscope, reduces assembly steps, and lowers assembly difficulty. In this way, while ensuring that the negative pressure controllable suction function, the bending controllable function, and the corresponding operating habits remain unchanged, the production cost of the endoscope is reduced, as specifically in the following embodiments.

[0032] Example 1

[0033] This embodiment provides a negative pressure suction nozzle for use in endoscopes, such as... Figure 1 and Figure 2 As shown, it includes a substrate 100, the substrate 100 comprising:

[0034] A fluid output terminal 110 is provided along a first direction of the substrate 100. The fluid output terminal 110 is used to connect to a negative pressure source. The negative pressure source performs negative pressure suction on the fluid output terminal 110, allowing the medium in the fluid channel inside the substrate 100 to flow out from the fluid output terminal 110. The negative pressure source is existing technology and can be a vacuum pump, a container in a negative pressure state, etc., which are not specifically limited here.

[0035] A fluid inlet 120 is provided, positioned along the second direction of the base 100. The fluid inlet 120 connects to an instrument tube and communicates with a fluid outlet 110 via a fluid channel within the base 100. Because a negative pressure source provides suction at the fluid outlet 110, and the pressure at the distal end of the instrument tube is generally normal when it is within the body cavity, a pressure difference exists between the distal end of the instrument tube and the fluid outlet 110. Under this pressure difference, the target object (gas, body fluid, tissue, or foreign body) within the body cavity is drawn into the instrument tube and discharged sequentially through the instrument tube, the fluid inlet 120, and the fluid outlet 110, thus achieving negative pressure suction of the target object within the body cavity. The instrument tube can be directly or indirectly connected to the fluid inlet 120. Figure 7 As shown, the instrument tube is connected to the fluid input terminal 120 in sequence through a Y-type connector 500 and a negative pressure suction valve 400. The Y-type connector 500 and the negative pressure suction valve 400 are both existing technologies. The third port of the Y-type connector 500 is used to insert surgical instruments and is normally in a sealed state.

[0036] The first limiting part 140 is located between the fluid output end 110 and the fluid input end 120. The first limiting part 140 is used to abut against the inner wall of the handle 10 housing to constrain the length of the fluid output end 110 extending out of the handle 10 housing. The fluid output end 110 passes through the mounting hole 161 on the handle 10 housing from inside the handle 10 housing and extends to the first limiting part 140 to abut against the inner wall of the handle 10 housing, so as to realize that the fluid output end 110 extends out of the handle 10 housing in a fixed quantity. At the same time, the mounting hole 161 can be used to radially limit and constrain the base 100 to ensure structural stability.

[0037] A rotating engagement part 130 is located inside the first limiting part 140 along a third direction of the base 100. The rotating engagement part 130 serves as the rotating shaft of the traction wheel 200 and rotates with the traction wheel 200. That is, the traction wheel 200 can be sleeved on the rotating engagement part 130. When the traction wheel 200 drives the traction rope to bend the distal end of the insertion part 20 in a directional manner, the base 100 will not be affected by the rotation of the traction wheel 200. When the negative pressure suction nozzle is connected to the negative pressure source for negative pressure suction, it will not affect the rotation of the traction wheel 200 around the shaft. The first direction, the second direction, and the third direction are opposite in direction. This facilitates the installation of the negative pressure suction nozzle onto the handle 10 housing, avoiding interference of the negative pressure suction function component with the installation of the bending controllable function component, and giving production personnel more operating space to install and fix the traction wheel and its related function components.

[0038] During the assembly and production of endoscopes, such as Figures 7-10As shown, the negative pressure suction nozzle can be connected to the instrument tube first. Then, the fluid output end 110 of the negative pressure suction nozzle is inserted into the mounting hole 161 on one half of the handle 10 housing, until it abuts against the inner wall of the handle 10 housing at the first limiting part 140. This achieves the initial installation and fixation of the negative pressure suction functional component. Then, the traction wheel 200 connected with the traction rope can be sleeved on the rotating fitting part 130 of the negative pressure suction nozzle. The rotating fitting part 130 is pre-fixed using the negative pressure suction nozzle. Then, the tension of the traction rope is adjusted according to the design requirements. After the relevant bending controllable functional components of the traction wheel 200 are adjusted and installed in place, the other half of the handle 10 housing is fastened and fixed, thus completing the installation. The negative pressure suction nozzle with controllable suction function is integrated into the functional component that enables the distal bending control function of the insertion part 20. Compared with the existing technology, the rotating shaft structure of the traction wheel 200 is eliminated, and the two functional components are used in overlapping space. While improving space utilization, it avoids the installation interference of the negative pressure suction function component on the bending control function component. This allows production personnel to have more operating space to install and fix the traction wheel 200 and its related functional components. It simplifies the number of basic components constituting the endoscope, reduces assembly steps, reduces assembly difficulty, and reduces the production cost of the endoscope, while ensuring that the negative pressure controllable suction function, bending control function and corresponding operating habits remain unchanged.

[0039] In some embodiments, to provide structural stability of the endoscope, a second limiting part 150 can be provided on the base 100. The second limiting part 150 is used to insert into the inner wall of the handle 10 housing to constrain the circumferential rotation stroke of the base 100. When the drive traction wheel 200 drives the traction rope to bend the distal end of the insertion part 20 in a specific direction, the base 100 will not be affected by the rotation of the traction wheel 200. At the same time, based on the insertion engagement between the second limiting part 150 and the inner wall of the handle 10 housing, the pressure arm of the negative pressure suction nozzle can be changed. When the fluid output end 110 is accidentally subjected to a lateral impact, the first limiting part 140 and the second limiting part 150 work together with the handle 10 housing to resist the lateral impact, avoiding damage to the negative pressure suction functional components caused by the impact, and improving the structural stability and safety of the device.

[0040] Preferably, the second limiting part 150 can be a protrusion, and correspondingly, the inner wall of the handle 10 housing is provided with a groove that matches the protrusion. The second limiting part 150 can also be a groove, and correspondingly, the inner wall of the handle 10 housing is provided with a protrusion that matches the groove. By using the interlocking fit between the groove and the protrusion, the circumferential rotation stroke of the base 100 is constrained, so that when the traction wheel 200 rotates around the rotating fit part, the base 100 remains stationary. The protrusion can be a non-rotationally symmetrical cross-section protrusion, such as an asymmetrical shape with a combination of circular arcs and straight lines / curves, or a polygonal cross-section.

[0041] In some embodiments, to improve the ease of endoscope assembly, the fluid output end 110, the first limiting part 140, the rotating fitting part 130, and the second limiting part 150 can be arranged sequentially along the axial direction of the base 100, where the third direction is the axial direction of the base 100. Based on the above structure, during assembly, the negative pressure suction nozzle can be first assembled and connected with the instrument tube, and then the negative pressure suction nozzle can be inserted into the mounting hole 161 of the housing half of the handle 10 on one side. At this time, the rotating fitting part 130 is far away from the mounting hole 161 and is almost not restricted by the housing half of the handle 10 where the mounting hole 161 is located, providing ample operating space. This provides greater installation space for assembling the bending controllable functional component corresponding to the traction wheel 200, and allows the traction wheel 200 to be positioned after being fitted onto the rotating fitting part 130, improving the ease of tension adjustment of the traction rope and reducing the assembly difficulty of the traction wheel 200 component. Preferably, the second direction is perpendicular to the third direction.

[0042] To improve the working stability of the traction wheel 200, a rotating mating part 130 can be provided at the end of the base 100 along a third direction. A stop surface 131 is provided on the inner side of the rotating mating part 130, which engages with the inner wall of the handle 10 housing to constrain the traction wheel 200's movement along the third direction on the base 100. Based on this structure, after the two handle 10 housing halves are fastened together, the traction wheel 200 mounted on the rotating mating part 130 is axially stopped and limited by the stop surface 131 and the mating part 162 of the handle 10 housing inner wall, effectively constraining the axial movement of the traction wheel 200 on the rotating mating part 130, preventing the traction wheel 200 from sliding along the axial direction of the base 100 on the rotating mating part 130, and improving the working stability of the traction wheel 200.

[0043] Example 2

[0044] This embodiment provides a driving mechanism applied to an endoscope, such as... Figures 3-6 As shown, the device includes a lever 300, a traction wheel 200, and the negative pressure suction nozzle from Embodiment 1. The lever 300 is connected to the traction wheel 200, which has a shaft hole that rotatably engages with the rotating fitting part 130. The traction wheel 200 also has a mounting part for installing the traction rope. During installation, the fluid output end 110 of the negative pressure suction nozzle is first installed onto the housing half of one side of the handle 10. Then, the shaft hole of the traction wheel 200 is fitted onto the rotating fitting part 130. At this time, the base 100 positions and constrains the traction wheel 200, allowing adjustment of the tension of the traction rope to ensure that the insertion part 20 is in a straight line at the zero point position. This effectively reduces processing difficulty, reduces the number of basic components, improves space utilization, reduces production costs, and improves production efficiency.

[0045] In some embodiments, to lock the distal bending state of the insertion part 20, the lever 300 may include an operating part 310 and a connecting part 320. The operating part 310 is connected to the traction wheel 200 via the connecting part 320. A friction element 333 is provided on the connecting part 320. The friction element 333 is used to cooperate with the inner wall of the handle 10 housing to increase the rotational resistance of the traction wheel 200. Based on the above structure, when the lever 300 drives the traction wheel 200 to rotate, thereby pulling the traction rope to drive the distal bending state of the insertion part 20 into position, the friction element 333 and the inner wall of the handle 10 housing cooperate to prevent the lever 300 from being accidentally moved, thus locking the distal bending state of the insertion part 20.

[0046] In some embodiments, to improve the ease of manipulating the directional bending of the distal end of the insertion part 20, a sliding groove 321 can be provided on the connecting part 320. The sliding groove 321 is arranged radially along the traction wheel 200, and a rod 332 is provided in the sliding groove 321. The friction member 333 passes through the through hole 322 on the connecting part 320 and is connected to the rod 332. The rod 332 has a sliding stroke in the sliding groove 321. The sliding stroke includes a first state and a second state. In the first state, the friction member 333 abuts against the inner wall of the handle 10 housing. In the second state, there is a preset gap between the friction member 333 and the inner wall of the handle 10 housing. Based on the above structure, when it is necessary to rotate the traction wheel 200, the rod 332 is slid to the second state. At this time, since there is a preset gap between the friction member 333 and the inner wall of the handle 10 housing, the rotation of the traction wheel 200 will not be affected by the friction resistance from the friction member 333, thus improving the driving convenience of the traction wheel 200. After the directional bending adjustment of the distal end of the insertion part 20 is in place, the rod 332 is slid to the first state. At this time, by utilizing the cooperation between the friction member 333 and the inner wall of the handle 10 housing, the lever 300 is prevented from being accidentally moved, thereby locking the directional bending state of the distal end of the insertion part 20. Preferably, the rod 332 is in the first state under normal conditions.

[0047] It should be noted that the sliding fit between the rod 332 and the sliding groove 321 is existing technology and can be achieved by structures such as clearance fit, track fit, and roller fit, which will not be elaborated here.

[0048] In some embodiments, to improve the ease of driving the traction wheel 200, the rod 332 and the sliding groove 321 can be configured to have a sliding stroke along the radial direction of the traction wheel 200. An inclined surface 334 is provided on the friction member 333, and in the first state, the inclined surface 334 corresponds to the inner wall of the through hole 322. Based on this structure, when the rod 332 slides from the first state to the second state, the inclined surface 334 on the friction member 333 abuts against the inner wall of the through hole 322, forcing the rod 332 to deform and move away from the inner wall of the handle 10 housing towards the sliding groove 321, thereby achieving automatic adjustment of the fit between the friction member 333 and the inner wall of the handle 10 housing. After the distal end of the insertion part 20 is directionally bent and adjusted to the correct position, the rod 332 is released. Under the self-deformation recovery action of the rod 332, it automatically returns from the second state to the first state, effectively reducing the operational burden and improving the ease of endoscope operation.

[0049] In some embodiments, in order to enable the friction element 333 to automatically return to the first state, an operating surface can be provided on the operating part 310. The operating surface is provided with a mounting groove 311, which is connected to the sliding groove 321. An elastic element 331 is provided in the mounting groove 311. The elastic element 331 or the rod 332 partially protrudes from the mounting groove 311, and the rod 332 is connected to the elastic element 331, so that the friction element 333 is in the first state under normal conditions. Based on the above structure, under normal conditions, the rod 332 is in the first state, and the friction element 333 abuts against the inner wall of the handle 10 housing. At this time, the elastic element 331 or part of the rod 332 protrudes from the operating surface to facilitate the operator's pressing. When pressing the protruding elastic element 331 or rod 332 toward the traction wheel 200, the inclined surface 334 moves toward the inner wall of the through hole 322. As the pressing action continues toward the traction wheel 200, the inclined surface 334 on the friction element 333 abuts against the inner wall of the through hole 322, forcing the rod 332 to deform, causing the friction element 333 to move away from the inner wall of the handle 10 housing and into the sliding groove 321, thus adjusting the friction element 333 to the second state.

[0050] Preferably, the elastic element 331 can be configured as an arc-shaped spring sheet structure, wherein the arc-shaped spring sheet has at least one fixed end that is fixedly connected to the inner wall of the mounting groove 311, and the free end of the arc-shaped spring sheet is connected to the rod body 332. In this case, the free end of the arc-shaped spring sheet can be configured to protrude from the operating surface. Alternatively, the elastic element 331 can be configured as a tubular spring structure, with the tubular spring sleeved on the rod body 332, one end of the tubular spring connected to the rod body 332, and the other end of the tubular spring connected to the inner wall of the mounting groove 311, so that the top end of the rod body 332 protrudes from the operating surface, and the friction element 333 is configured at the bottom of the rod body 332.

[0051] Example 3

[0052] This embodiment provides an endoscope, such as Figures 7-10 As shown, the endoscope includes a handle 10 and an insertion part 20. The proximal end of the insertion part 20 is connected to the distal end of the handle 10. The endoscope also includes the negative pressure suction nozzle in Embodiment 1 or the driving mechanism in Embodiment 2. The fluid input end 120, the rotating mating part 130 and the first limiting part 140 are disposed in the handle 10 housing. The fluid output end 110 extends at least partially out of the handle 10 housing.

[0053] Specifically, the housing can be configured to include two halves, namely a first half and a second half. The first half is provided with the mounting hole 161, and the second half is provided with a mating part 162 that matches the second limiting part 150. The mating part 162 is a groove or a protrusion. The mating part 162 can engage with the stop surface 131 on the base 100 to constrain the axial movement stroke of the traction wheel 200 and prevent the traction wheel 200 from sliding axially.

[0054] Specifically, the housing is also provided with a strip groove 163, the rod 332 passes through the strip groove 163 and is connected to the traction wheel 200, the lever 300 is outside the housing, and under normal conditions the friction element 333 abuts against the inner wall of the strip groove 163.

[0055] The endoscope provided in this application embodiment can be a suction endoscope, or a bronchoscope, esophagoscope, gastroscope, colonoscope, otoscope, rhinoscope, oral endoscope, laryngoscope, colposcope, laparoscope, arthroscope, nephroscope, etc. This application embodiment does not specifically limit the type of endoscope.

[0056] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0057] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A negative pressure suction nozzle, used in an endoscope, characterized in that, Includes a matrix, said matrix comprising: A fluid output end is provided along a first direction of the substrate and is used to connect to a negative pressure source. A fluid input end is provided along the second direction of the substrate. The fluid input end is used to connect to the instrument tube. The fluid input end is connected to the fluid output end through a fluid channel provided in the substrate. The first limiting part is located between the fluid output end and the fluid input end. The first limiting part is used to abut against the inner wall of the handle housing to constrain the length of the fluid output end extending out of the handle housing. A rotating engagement part is provided inside the first limiting part along a third direction of the base. The rotating engagement part is used as the rotating shaft of the traction wheel and rotates with the traction wheel. The first direction, the second direction and the third direction are opposite to each other.

2. The negative pressure suction nozzle according to claim 1, characterized in that, The base is provided with a second limiting part, which is used to insert and cooperate with the inner wall of the handle housing to constrain the circumferential rotation stroke of the base.

3. A negative pressure suction nozzle according to claim 2, characterized in that, The fluid output end, the first limiting part, the rotating fitting part, and the second limiting part are arranged along the axial direction of the base body, and the third direction is the axial direction of the base body.

4. A negative pressure suction nozzle according to any one of claims 1 to 3, characterized in that, The rotating fitting part is located at the end of the base body along the third direction. A stop surface is provided on the inner side of the rotating fitting part. The stop surface is used to cooperate with the inner wall of the handle housing to constrain the movement of the traction wheel along the third direction on the base body.

5. A drive mechanism for use in an endoscope, characterized in that, It includes a lever, a traction wheel, and a negative pressure suction nozzle as described in any one of claims 1 to 3. The lever is connected to the traction wheel, the traction wheel has a shaft hole that is coaxially rotatably engaged with the rotating fitting part, and the traction wheel has a mounting part for installing a traction rope.

6. A driving mechanism according to claim 5, characterized in that, The lever includes an operating part and a connecting part. The operating part is connected to the traction wheel through the connecting part. A friction element is provided on the connecting part. The friction element is used to cooperate with the inner wall of the handle housing to increase the rotational resistance of the traction wheel.

7. A driving mechanism according to claim 6, characterized in that, The connecting part is provided with a sliding groove, which is arranged radially along the traction wheel. A rod is provided in the sliding groove. The friction element passes through the through hole on the connecting part and is connected to the rod. The rod has a sliding stroke in the sliding groove. The sliding stroke includes a first state and a second state. In the first state, the friction element abuts against the inner wall of the handle housing. In the second state, there is a preset gap between the friction element and the inner wall of the handle housing.

8. A driving mechanism according to claim 7, characterized in that, The rod and the sliding groove have a sliding stroke along the radial direction of the traction wheel, and the friction element is provided with an inclined surface, which corresponds to the inner wall of the through hole in the first state.

9. A driving mechanism according to claim 8, characterized in that, The operating part is provided with an operating surface, and the operating surface is provided with an installation groove. The installation groove is connected to the sliding groove. An elastic element is provided in the installation groove. The elastic element protrudes from the installation groove. The rod body is connected to the elastic element so that the friction element is in the first state under normal conditions.

10. An endoscope, characterized in that, The endoscope includes a handle and an insertion part, the proximal end of the insertion part being connected to the distal end of the handle. The endoscope also includes a negative pressure suction nozzle as described in any one of claims 1 to 4 or a drive mechanism as described in any one of claims 5 to 9. The fluid input end, the rotating mating part, and the first limiting part are disposed within the handle housing, and the fluid output end extends at least partially out of the handle housing.

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