Traction structure, handle and endoscope

Abstract

This application discloses a traction structure, a handle, and an endoscope, belonging to the field of medical device technology, to solve the technical problems of difficult precision control and error susceptibility in the assembly process of traction wheels in related technologies. The traction structure includes a traction wheel that can move relative to a first housing between a first position and a second position. When the traction wheel is in the first position, it is in a rotational limiting engagement with the first housing; when the traction wheel is in the second position, the rotational limiting engagement with the first housing is released. During the assembly of the lever, at least a portion of the traction wheel is located on the movement path of the lever, and the lever can push the traction wheel from the first position to the second position. This structure effectively prevents accidental deflection, axial movement, and radial eccentricity of the traction wheel during assembly, and eliminates the need for additional positioning and locking clamps, simplifying the complex locking and releasing mechanisms in the endoscope.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to a traction structure, a handle, and an endoscope. Background Technology

[0002] An endoscope is a commonly used medical device that can directly enter the body's natural passages, providing doctors with comprehensive diagnostic information for disease treatment. In the assembly of precision medical devices like endoscopes, the assembly of the traction wheel and lever is a crucial step in achieving the bending and directional control of its tip. Endoscopes typically contain a complex mechanical transmission system. This system, through a control knob on the operating handle, drives the traction wire, which in turn drives the curved section at the endoscope's tip to flexibly rotate up, down, left, and right. The traction wheel and lever are the core connecting components in this transmission chain: the traction wheel is responsible for winding or releasing the traction wire, while the lever translates the operator's rotational movements into precise rotation of the traction wheel.

[0003] Furthermore, traditional assembly of traction wheels relies heavily on manual operation, using tools such as tweezers and microscopes to position and fix tiny parts. This method is not only inefficient but also highly susceptible to damage, misalignment, or uneven preload due to human factors (such as hand tremors or improper force control). For example, during the engagement of the traction wheel with the drive mechanism (such as a lever), the traction wheel and its mating components are extremely small (often on the order of millimeters or even smaller), making it highly prone to misalignment due to hand tremors or improper force control during manual operation. If the traction wheel itself is not fixed during assembly, the applied assembly force (such as pressing or pushing) may cause it to rotate unexpectedly, move axially, or become radially eccentric, introducing unnecessary internal stress. Traction wheels are typically made of precision metal or engineering plastics. If not effectively fixed during assembly, hard contact or friction with other parts may cause scratches, deformation, or edge chipping. The rotation center of the traction wheel must be strictly coaxial with the center of its drive shaft and support bearing. If the traction wheel floats during assembly, it is difficult to guarantee the final coaxiality, affecting the smoothness of the transmission.

[0004] Existing technologies typically employ the following methods to secure traction wheels: operators use precision tweezers, probes, or miniature clamps to externally grip or hold the traction wheel. This method is highly dependent on operator skill, suffers from inconsistent performance, and can easily lead to operator fatigue. The clamping force is difficult to control precisely; excessive force can damage the parts, while insufficient force results in insecure fixation. The clamps may obstruct vision or operating space, affecting assembly accuracy. Furthermore, it is inefficient and unsuitable for mass production.

[0005] Alternatively, operators can use extremely low-tack temporary adhesive or a vacuum pen to adhere the traction wheel. Adhesives may contaminate precision components, affecting subsequent functionality or biosafety; adhesion is greatly affected by surface smoothness and cleanliness, and is prone to detachment; additional steps (application, cleaning) are required.

[0006] The lack of efficient, stable, automated, or semi-automated assembly solutions in current technologies makes it difficult to guarantee product consistency, resulting in a high defect rate and increased maintenance and rework costs. Therefore, optimizing the positioning of the traction wheel during assembly and addressing the existing problems of difficulty in controlling the fixing accuracy of the traction wheel, reliance on manual labor, and susceptibility to errors has become a critical technological bottleneck that urgently needs to be overcome in the field of endoscope manufacturing. Summary of the Invention

[0007] This application discloses a traction structure, a handle, and an endoscope to solve the technical problems of difficult precision control and easy error in the traction wheel assembly process in related technologies.

[0008] To solve the above problems, this application adopts the following technical solution:

[0009] In a first aspect, this application proposes a traction structure for an endoscope. The endoscope includes a first housing, and the traction structure is disposed on the first housing. The traction structure includes a traction wheel, which is movable relative to the first housing between a first position and a second position. When the traction wheel is in the first position, the traction wheel is in a rotational limiting engagement with the first housing; when the traction wheel is in the second position, the rotational limiting engagement with the first housing is released.

[0010] The traction structure also includes a lever, which is rotatably mounted on the first housing and can rotate relative to the first housing around a first axis. When the traction wheel is in the second position, the lever and the traction wheel are in a rotational limiting engagement. During the assembly of the lever, at least a portion of the traction wheel is located on the movement path of the lever, and the lever can push the traction wheel from the first position to the second position.

[0011] The traction structure provided above can achieve the following beneficial effects:

[0012] This application effectively prevents accidental deflection, axial movement, and radial eccentricity of the traction wheel during assembly, without affecting the free rotation of the traction wheel after assembly. This application achieves locking and unlocking of the traction wheel through the cooperation of the traction wheel itself and the first housing structure, eliminating the need for additional positioning and locking clamps and simplifying the complex locking and releasing mechanism in the endoscope. This structure transforms the assembly pushing action of the lever into a linear displacement drive for the traction wheel, and releases the traction wheel from the rotation limit of the first housing in the second position. The assembly process and the unlocking process of the traction wheel are simultaneously achieved by pushing the lever, which not only simplifies the operation steps but also improves the integration of the traction structure.

[0013] Secondly, this application provides a handle, including the traction structure of the first aspect. This handle has the same technical features as the traction structure provided in this application and can achieve the same technical effect, which will not be described in detail here.

[0014] Thirdly, this application provides an endoscope, including a traction structure as described in the first aspect and a handle as described in the second aspect. This endoscope has the same technical features as the traction structure and handle provided in this application, and can achieve the same technical effects, which will not be elaborated further here. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application 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 this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 These are schematic diagrams of the endoscopes provided in some embodiments (the dashed line represents the first axis).

[0017] Figure 2 These are exploded structural diagrams of endoscopes provided in some embodiments;

[0018] Figure 3 These are three-dimensional structural diagrams of the traction wheel from a bottom-up perspective, provided in some embodiments;

[0019] Figure 4 These are bottom views of the traction wheel provided in some embodiments;

[0020] Figure 5 These are three-dimensional structural diagrams of the lever provided in some embodiments;

[0021] Figure 6 This is a three-dimensional structural schematic diagram of the second housing provided in some embodiments;

[0022] Figure 7 This is a three-dimensional structural schematic diagram of the first housing provided in some embodiments;

[0023] Figure 8 This is a three-dimensional structural schematic diagram of the first housing provided in some other embodiments;

[0024] Figure 9 These are exploded schematic diagrams of the traction structure provided in some embodiments;

[0025] Figure 10 yes Figure 9 Exploded view from a tilting angle after removing the lever and the second housing;

[0026] Figure 11 yes Figure 10 A schematic diagram of the longitudinal section of the traction structure after assembly;

[0027] Figure 12 yes Figure 9 Explosion diagram after the second casing has been removed;

[0028] Figure 13 yes Figure 12 A schematic diagram of the longitudinal section of the traction structure after assembly;

[0029] Figure 14 yes Figure 9 A schematic diagram of the assembled traction structure;

[0030] Figure 15 yes Figure 14 A schematic diagram of the longitudinal section of the traction structure;

[0031] Figure 16 yes Figure 14 A three-dimensional structural diagram of the traction structure after the traction wheel has been removed;

[0032] Figure 17 It is a three-dimensional structural diagram of the assembly of the traction wheel and the lever;

[0033] Figure 18 This is a schematic diagram of the half-section structure of the endoscope after the second housing has been removed.

[0034] In the picture:

[0035] 10. Handle; 20. Insertion part; 30. Endoscope;

[0036] 100. Lever; 110. First latching arm; 120. First limiting structure; 130. Third limiting structure; 140. Elastic part; 150. Actuating part; 160. Sealing ring;

[0037] 200. Traction wheel; 210. Second locking arm; 220. Fifth limiting structure; 230. Second limiting structure; 240. Transition surface;

[0038] 310. First housing; 311. Base; 312. Sixth limiting structure; 313. Fastening part; 313a. First fastening surface; 313b. Second fastening surface; 314. Fourth limiting structure; 315. Mounting hole; 320. Second housing; 321. Abutting part; 322. Embedding part;

[0039] 400, interference gap;

[0040] a. First axis. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0042] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, 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.

[0043] In the various embodiments of this application, "proximal end" and "distal end" refer to the position of the endoscope and its components and 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".

[0044] During the assembly of the endoscope traction wheel, if the traction wheel itself is not fixed, the applied assembly force (such as pressing or pushing) may cause it to rotate unexpectedly, move axially, or become radially eccentric, introducing unnecessary internal stress. If the traction wheel is not effectively fixed during assembly, hard contact or friction with other parts may cause scratches, deformation, or edge chipping. The rotation center of the traction wheel must be strictly coaxial with the center of its drive shaft and support bearing. If the traction wheel floats during assembly, it is difficult to guarantee the final coaxiality, affecting the smoothness of transmission. The traditional assembly process of the traction wheel relies heavily on manual operation, using tools such as tweezers and microscopes to position and fix tiny parts. This method is not only inefficient and inconsistent, but also highly susceptible to damage, positional displacement, or uneven preload due to human factors (such as hand tremors or improper force control).

[0045] To address the aforementioned technical problems, this application provides a traction structure. The traction wheel and the first housing in this traction structure have two states: rotationally limited and rotationally unlocked. During the assembly process of the lever and the traction wheel, the traction wheel is initially in the rotationally limited state, effectively preventing accidental deflection, axial movement, and radial eccentricity of the traction wheel during assembly. The lever pushes the traction wheel to move relative to the first housing, switching the traction wheel from the rotationally limited state to the state of rotationally unlocked, without hindering the normal use of the traction wheel after assembly.

[0046] The following is in conjunction with the appendix Figures 1 to 18 The present application provides a detailed description of a traction structure, handle, and endoscope through specific embodiments and application scenarios.

[0047] Reference Figures 1-18 This application proposes a traction structure for an endoscope 30. The endoscope 30 includes a first housing 310, and the traction structure is disposed on the first housing 310. The traction structure includes a traction wheel 200, which is movable relative to the first housing 310 between a first position and a second position. When the traction wheel 200 is in the first position, the traction wheel 200 is in a rotational limiting engagement with the first housing 310; when the traction wheel 200 is in the second position, the rotational limiting engagement with the first housing 310 is released.

[0048] For example, such as Figure 2 , Figure 11 , Figures 13-15 , Figure 17 and Figure 18 As shown, the traction wheel 200 can slide along the axial or radial direction of the first housing 310, for example, by means of a groove, guide rail, or elastic buckle to switch between a first position and a second position. When the traction wheel 200 is in the first position, its outer periphery or end face is provided with a limiting structure such as a protrusion, tooth, or groove, which meshes or abuts with the corresponding mating structure inside the first housing 310 (such as a limiting groove, a locking tooth, or a stop), thereby limiting the rotation of the traction wheel 200 relative to the first housing 310. This ensures that during the assembly of the traction structure, the traction wheel 200 can be rotated and limited relative to the first housing 310 used to install the traction wheel 200, thereby preventing accidental deflection, axial movement, and radial eccentricity of the traction wheel 200 during the assembly process.

[0049] The traction structure of this application also includes a lever 100, which is rotatably disposed on the first housing 310 and can rotate relative to the first housing 310 about a first axis a. When the traction wheel 200 is in the second position, the lever 100 and the traction wheel 200 are in a rotational limiting engagement. During the assembly of the lever 100, at least a portion of the traction wheel 200 is located on the movement path of the lever 100, and the lever 100 can push the traction wheel 200 from the first position to the second position. For example, as shown... Figure 2 , Figures 13-15 , Figure 17 and Figure 18 As shown, the lever 100 can be pivotally connected to the interior or side wall of the first housing 310. One end of the lever has an operating part for manual operation by the operator, and the other end forms a pushing part that engages with the traction wheel 200 for positioning. During assembly, the traction wheel 200 is in the first position and locked to the first housing 310. During assembly, as the traction rope assembly and adjustment are completed, the operator pushes the lever 100 in the direction of the first axis a or in the radial direction of the traction wheel 200, causing the pushing part of the lever 100 to gradually approach and contact the axial surface, outer edge, end face, or specific force-bearing surface of the traction wheel 200 along the direction of the first axis a or in the radial direction. Since at least a part of the structure of the traction wheel 200 is located on the moving path of the lever 100, as the lever 100 continues to push, the pushing part applies a thrust to the traction wheel 200, overcoming any possible elastic holding force, and driving the traction wheel 200 to slide in a preset direction, moving from the first position to the second position.

[0050] When the traction wheel 200 reaches the second position, at the same time as the traction wheel 200 releases the rotation limit from the first housing 310, a specific structure on the traction wheel 200 (such as a limiting groove, a bayonet, or a plane) and the corresponding part of the lever 100 (such as a limiting hook, a protrusion, or a stop surface) form a rotation limit engagement, which facilitates the subsequent operation of the lever 100 to drive the traction wheel 200 to rotate, thereby driving the bending operation of the distal bending part of the endoscope 30.

[0051] In this embodiment, the structure effectively prevents accidental deflection, axial movement, and radial eccentricity of the traction wheel 200 during assembly, and does not affect the free rotation of the traction wheel 200 after assembly. The structure achieves locking and unlocking of the traction wheel 200 through the cooperation between the traction wheel 200 itself and the first housing 310, eliminating the need for additional positioning and locking clamps and simplifying the complex locking and releasing mechanism in the endoscope 30. The structure transforms the assembly pushing action of the lever 100 into a linear displacement drive for the traction wheel 200, and releases the traction wheel 200 from the rotation limit of the first housing 310 in the second position, achieving rotation limit with the lever 100. The assembly process and the unlocking process of the traction wheel 200 are simultaneously achieved through the pushing of the lever 100, which not only simplifies the operation steps but also improves the integration and reliability of the traction structure.

[0052] In some embodiments, the traction wheel 200 has a fifth limiting structure 220, and the first housing 310 has a sixth limiting structure 312. When the traction wheel 200 is in a first position, the fifth limiting structure 220 and the sixth limiting structure 312 are in a rotational limiting engagement; when the traction wheel 200 is in a second position, the fifth limiting structure 220 and the sixth limiting structure 312 are released from the rotational limiting engagement. For example, as... Figure 3 , Figure 4 , Figures 7-11 , Figure 13 and Figures 15-18 As shown, the traction wheel 200 is provided with a fifth limiting structure 220, which can be a convex key, a limiting boss, a non-circular cross-section shaft segment, a radial lug, or circumferentially distributed locking teeth. Correspondingly, the first housing 310 is provided with a matching sixth limiting structure 312, which can be a limiting groove, a keyway, a bayonet, an internal gear ring, or a mating cavity with a stop surface. When the traction wheel 200 is in the first position, the fifth limiting structure 220 and the sixth limiting structure 312 are engaged or abutted against each other, forming a rotational limiting fit in the circumferential direction, preventing the traction wheel 200 from rotating freely relative to the first housing 310. After the traction wheel 200 is moved to the second position, the rotational limiting fit between the fifth limiting structure 220 and the sixth limiting structure 312 is released.

[0053] In this embodiment, the fifth limiting structure 220 and the sixth limiting structure 312 cooperate to lock the traction wheel 200 in the first position and allow it to rotate freely in the second position. This structure balances operational reliability and structural compactness, making it particularly suitable for endoscope 30 traction systems that require extremely high operational precision and safety.

[0054] In some embodiments, when the traction wheel 200 is in the second position, the lever 100 engages with the traction wheel 200 in the direction of the first axis a, and restricts the traction wheel 200 from moving to the first position. For example, as shown... Figure 13 , Figure 15 and Figure 18As shown, when the traction wheel 200 is pushed to the second position by the lever 100, at least a portion of the lever 100 (e.g., its end boss, limiting arm, or hook) engages or abuts with a corresponding structure (e.g., annular groove, axial shoulder, or limiting hole) on the traction wheel 200 in the direction of the first axis a (i.e., the direction of the rotation axis of the lever 100). This engagement constrains the traction wheel 200 in the axial direction, preventing it from accidentally sliding back to the first position due to factors such as an elastic reset element (e.g., a spring) or external vibration without external force. For example, the side wall of the traction wheel 200 may be provided with a limiting step extending along its thickness direction, and after the lever 100 is rotated to a predetermined angle, the limiting protrusion at its end precisely engages with the axial inner side of this step. At this time, even if the traction wheel 200 is subjected to a thrust toward the first position, it will be blocked by the protrusion of the lever 100, thereby remaining stable in the second position. For example, the traction wheel 200 has an axially penetrating limiting groove inside or on its outer edge, and the lever 100 has a matching pin or protrusion. When the lever 100 rotates to its position, the pin is inserted into the limiting groove, forming a physical block in the direction of the first axis a, which not only restricts the axial return of the traction wheel 200, but also provides rotational limiting (so that the lever 100 drives the traction wheel 200 to rotate), thus achieving a dual function.

[0055] In this embodiment, this axial limiting engagement not only improves the stability of the traction structure in the unlocked state, but also prevents accidental operation caused by accidental contact or vibration from causing the traction wheel 200 to return to the first locked position, thus enhancing the safety and controllability of the endoscope 30 operation. Simultaneously, the operator only needs to reverse the lever 100 to disengage it from the axial limiting engagement with the traction wheel 200, and the traction wheel 200 will automatically return to the first position under the action of the return spring, restoring the locked position.

[0056] In some embodiments, when the traction wheel 200 is in the second position, the first housing 310 engages with the traction wheel 200 in the direction of the first axis a, and restricts the traction wheel 200 from moving away from the first housing 310. For example, as... Figure 11 , Figure 13 , Figure 15 and Figure 18As shown, the first housing 310 has an axial limiting structure in the region corresponding to the second position of the traction wheel 200. The axial limiting structure can be a limiting flange, a retaining ring, a buckle, or an inner wall step, etc. When the traction wheel 200 is pushed to the second position by the lever 100, its end face or boss near the outer side of the first housing 310 abuts or engages with the limiting structure in the direction of the first axis a, thereby preventing the traction wheel 200 from continuing to move away from the first housing 310. For example, the traction wheel 200 can be slidably installed in a guide groove in the first housing 310, one end of which (the end near the first housing 310) corresponds to the first position, and the other end (the end away from the first housing 310) corresponds to the second position. At the end of the guide groove away from the first housing 310, the first housing 310 forms an inwardly extending annular shoulder or a partial protrusion. When the traction wheel 200 is pushed to the second position by the lever 100, the axial stop surface of its outer edge or bottom contacts the shoulder to form a mechanical limit, preventing the traction wheel 200 from coming out of the housing or displacing excessively, and ensuring that it stays stably in the second position.

[0057] In this embodiment, the structure not only prevents the traction wheel 200 from accidentally coming off during operation or maintenance, but also works in conjunction with the limiting function of the lever 100: the lever 100 restricts the traction wheel 200 from moving back to the first position, and the first housing 310 restricts its movement in the away direction. Together, they clamp the traction wheel 200 in the second position in the axial direction, forming a reliable bidirectional axial positioning, which improves the stability of the structure and the safety of use.

[0058] In some embodiments, the first housing 310 has a fastening portion 313, the lever 100 has a first fastening arm 110 that fastens to the fastening portion 313, and the traction wheel 200 has a second fastening arm 210 that fastens to the fastening portion 313, and the first fastening arm 110 and the second fastening arm 210 are rotationally limited together. For example, as... Figures 9-11 , Figure 13 , Figure 15 , Figure 17 and Figure 18As shown, the inner wall of the first housing 310 is provided with a protruding fastening portion 313 (e.g., a hook or a barbed latch). This fastening portion 313 has at least two fastening surfaces or slots, respectively used to engage with the fastening structures on the lever 100 and the traction wheel 200. Specifically, a first fastening arm 110 extends from one side of the lever 100, and its end is provided with a latch, hole, or hook-like structure that matches the fastening portion 313; the traction wheel 200 extends a second fastening arm 210 circumferentially or at its end, also having a mating feature adapted to the fastening portion 313. In the assembled state, the first fastening arm 110 and the second fastening arm 210 fasten with the same fastening portion 313 from different directions, thereby fixing the lever 100 and the traction wheel 200 together to the first housing 310. The first fastening arm 110 and the second fastening arm 210 are provided with mutually engaging limiting surfaces, protrusions and grooves, or interlaced toothed structures. When the lever 100 rotates around the first axis a, its first latching arm 110 will drive or push the second latching arm 210, thereby driving the traction wheel 200 to rotate synchronously.

[0059] In this embodiment, the structure achieves compact spatial integration and functional linkage between the lever 100 and the traction wheel 200 by sharing a single fastening part 313. This not only simplifies the number of parts and the assembly process, but also improves the synchronization and reliability of the mechanism's actions. It is particularly suitable for the internal structure of the endoscope 30 handle 10 in space-constrained environments.

[0060] In some embodiments, the fastening portion 313 is configured as a protruding ring inside the shaft hole on the axial side of the traction wheel 200, and the shaft hole is used for rotatable engagement with the base 311 of the first housing 310. For example, as shown... Figures 9-11 , Figure 13 , Figure 15 and Figure 18As shown, the center of the traction wheel 200 has a shaft hole for engaging with the base 311 of the first housing 310, which extends axially through the traction wheel 200. An integrally formed or embedded protruding ring is provided on the inner wall of the shaft hole. This protruding ring extends continuously or segmentally along the circumference of the shaft hole, and its longitudinal section is rectangular (i.e., a rectangular outline in the axial-radial section), thus forming an annular stepped structure with a defined axial thickness and radial height inside the shaft hole. The two axial end faces of this protruding ring respectively constitute a first fastening surface 313a and a second fastening surface 313b, and these two fastening surfaces are arranged opposite to each other (i.e., one faces the proximal end of the traction wheel 200, and the other faces the distal end, facing away from each other). Specifically, the first fastening surface 313a is located on the side of the protruding ring closest to the base 311 of the first housing 310 (e.g., the axial inner side), for fastening with the first fastening arm 110 of the lever 100. Once the lever 100 is assembled, the hook-shaped end or claw of its first latching arm 110 hooks or abuts against the first latching surface 313a from the axial inner side, realizing the linkage between the lever 100 and the traction wheel 200 in the axial and / or circumferential directions. The second latching surface 313b is located on the side of the convex ring away from the base 311 (e.g., the axial outer side), and is used to latch with the second latching arm 210 of the traction wheel 200 itself (or a structure fixedly connected to it). In some embodiments, the second latching arm 210 may be an elastic hook extending radially or axially from the body of the traction wheel 200, with its end hooked onto the second latching surface 313b, forming a self-locking or auxiliary positioning. Since the first latching surface 313a and the second latching surface 313b are arranged opposite to each other, the first latching arm 110 and the second latching arm 210 latch from both sides of the convex ring respectively, without interfering with each other, and can be stably connected to the same convex ring simultaneously.

[0061] In this embodiment, the convex ring on the inner wall of the shaft hole simultaneously achieves the engagement with two different components (the lever 100 and the traction wheel 200 itself), eliminating the need for additional independent buckles or mounting points and saving space. The convex ring is "clamped" axially by two engagement arms, which not only prevents the traction wheel 200 from moving axially but also enhances the linkage rigidity between the lever 100 and the traction wheel 200.

[0062] In some embodiments, an interference gap 400 is provided between the first snap-fit ​​arm 110 and the second snap-fit ​​arm 210 to prevent interference between them when elastic deformation occurs. For example, as... Figure 13 , Figure 15 and Figure 18As shown, a small interference gap 400 (elastic clearance or deformation buffer gap) is reserved between the first snap-fit ​​arm 110 and the second snap-fit ​​arm 210 in their relative movement direction (e.g., circumferential or axial) in the assembled state. The size of this gap is slightly larger than the size that would cause interference when the two snap-fit ​​arms undergo the maximum elastic deformation that may occur during normal operation or assembly, thereby ensuring that when either snap-fit ​​arm undergoes elastic deformation such as bending, torsion, or compression due to force, it will not make hard contact or structural interference with the other snap-fit ​​arm. For example, during the process of the lever 100 rotating to push the traction wheel 200 from the first position to the second position, the first snap-fit ​​arm 110 may undergo a slight elastic bending due to force; at the same time, the second snap-fit ​​arm 210 may also undergo slight deformation when pushed or engaged in the snap-fit ​​part 313. If there is insufficient clearance between the two, this deformation may cause interference between the first snap-fit ​​arm 110 and the second snap-fit ​​arm 210. This could prevent the first snap-fit ​​arm 110, which deforms later to complete the snap-fit ​​during assembly, from engaging with the second snap-fit ​​arm. Furthermore, it could lead to localized stress concentration, jamming, or even structural damage between the first snap-fit ​​arm 110 and the second snap-fit ​​arm 210. However, by reserving a certain size (the specific value is optimized based on material stiffness and structural dimensions) of interference clearance 400 during the design phase, these problems can be effectively avoided. Specifically, a chamfer, a locally thinned area, or a non-contact curved surface can be provided on the inner edge of the first snap-fit ​​arm 110 or the outer contour of the second snap-fit ​​arm 210 to ensure that the two remain in a non-contact state even under extreme deformation. In addition, this clearance can accommodate manufacturing tolerances and assembly errors, improving product yield and durability. Furthermore, this interference clearance 400 does not refer to an interference fit during assembly, but rather a reserved space slightly larger than the theoretical contact distance, proactively designed to cope with elastic deformation. Its purpose is to prevent interference rather than achieve a tight fit. This structure can balance structural compactness and motion reliability.

[0063] In this embodiment, the structure ensures that when any snap-fit ​​arm undergoes elastic deformation such as bending, torsion, or compression due to force, it will not make hard contact or structural interference with another snap-fit ​​arm, and the structure can also accommodate manufacturing tolerances and assembly errors.

[0064] In some embodiments, at least one of the first snap-fit ​​arm 110 and the second snap-fit ​​arm 210 is provided with a transition surface 240 at a position corresponding to the interference gap 400 to prevent interference between the first snap-fit ​​arm 110 and the second snap-fit ​​arm 210 at the interference gap 400 during assembly. For example, as... Figure 13 , Figure 15 , Figure 17 and Figure 18As shown, to prevent interference between the first snap-fit ​​arm 110 and the second snap-fit ​​arm 210 during elastic deformation, an interference gap 400 is provided at the junction of the first snap-fit ​​arm 110 and the second snap-fit ​​arm 210. The interference gap 400 can be configured as a chamfer or a recessed structure. When the interference gap 400 is a recessed structure with an edge, during assembly, the first snap-fit ​​arm 110 and the second snap-fit ​​arm 210 are prone to jamming at the edge of the interference gap 400 during relative movement, preventing the assembly from being completed and even damaging the structure. Therefore, a transition surface 240 is provided on the edge area of ​​the first snap-fit ​​arm 110 and / or the second snap-fit ​​arm 210 facing each other and adjacent to the interference gap 400. The transition surface 240 can be configured as a chamfer, rounded corner, bevel, or arc-shaped guide surface. The function of the transition surface 240 is to guide the two snap-fit ​​arms to pass smoothly through their adjacent areas during assembly, avoiding edge collisions, scratches, or jamming caused by minor misalignments, manufacturing tolerances, or assembly angle deviations. For example, the inner end of the first snap-fit ​​arm 110 has a chamfer, while the corresponding outer edge of the second snap-fit ​​arm 210 has a rounded corner. When the lever 100 and the traction wheel 200 are installed into the first housing 310 and approach the snap-fit ​​part 313, even if there is a slight offset between the two in their initial positions, these transition surfaces 240 can allow the first snap-fit ​​arm 110 to slide into the interference gap 400 between it and the second snap-fit ​​arm 210, instead of directly impacting each other with sharp edges. This structure significantly reduces assembly resistance and improves assembly smoothness and yield. Furthermore, the sidewall of the first snap-fit ​​arm 110 is designed as a tapered wedge-shaped slope near the gap. As assembly progresses, this slope gradually pushes the second snap-fit ​​arm 210 away. After passing the critical point, both arms are stably positioned within the preset interference gap 400. The first snap-fit ​​arm 110 and the second snap-fit ​​arm 210 achieve a rotational limiting fit after assembly, and this structure is both interference-free and compact.

[0065] In this embodiment, the transition surface 240 guides the two interlocking arms to smoothly pass through their adjacent areas, avoiding edge collisions, scratches, or jamming caused by minor misalignments, manufacturing tolerances, or assembly angle deviations, instead of direct impact with each other by sharp edges. This structure significantly reduces assembly resistance and improves assembly smoothness and yield.

[0066] In some embodiments, the endoscope 30 further includes a second housing. The second housing 320 has an abutment portion 321 that abuts against the traction wheel 200 when the traction wheel 200 is in the second position, thereby restricting the movement of the traction wheel 200 away from the first housing 310. For example, as... Figure 6 , Figure 9 and Figures 14-16As shown, the second housing 320 may be the rear housing, side cover, or another part assembled with the first housing 310 of the endoscope 30 handle 10. Its inner surface is provided with an abutment portion 321, such as a protrusion, a stop, a limiting rib, or a locally thickened structure. When the first housing 310 and the second housing 320 are assembled in place, the abutment portion 321 is located exactly at the end of the movement path of the traction wheel 200 in the second position. After the traction wheel 200 is pushed to the second position by the lever 100, it abuts against the end face, flange, or side wall of the traction wheel 200 from the side away from the first housing 310, thereby forming a physical block in the axial direction to prevent the traction wheel 200 from continuing to disengage away from the first housing 310 due to external force, vibration, or the action of internal elastic elements.

[0067] Specifically, the traction wheel 200 is slidably disposed along the axial direction of the first housing 310, and an annular flange is provided at the end away from the first housing 310; the second housing 320 is provided with an annular or dot-shaped abutment portion 321 at the corresponding position. When the traction wheel 200 is pushed to the second position, its flange is tightly abutted against the abutment portion 321, forming an axial limit, which, together with the limiting structure (lever 100 abutting) on ​​the side of the first housing 310, clamps the traction wheel 200 to achieve bidirectional axial positioning.

[0068] In this embodiment, the structure utilizes the structural features of the second housing 320 to achieve reliable axial constraint on the traction wheel 200 in the second position without adding independent limiting parts. This is particularly suitable for the endoscope 30 handle 10 in compact spaces where high assembly efficiency and structural strength are required. Simultaneously, the abutment portion 321 can also serve as an assembly guide or error-proof structure.

[0069] In some embodiments, the second housing 320 further includes an insert 322, which, when the traction wheel 200 is in the second position, engages radially with at least one of the traction wheel 200, the first fastening arm 110, and the second fastening arm 210. For example, as... Figure 6 , Figure 9 and Figures 15-16As shown, the second housing 320 has an embedding portion 322 on its inner wall. This embedding portion 322 can be a protruding rib, a limiting post, a claw, an arc-shaped boss, or a partially concave structure, and its position precisely corresponds to the spatial layout of the traction wheel 200 assembly in the second position. When the traction wheel 200 is pushed to the second position by the lever 100, the embedding portion 322 inserts into or approaches the traction wheel 200 body from the radial direction (i.e., the direction perpendicular to the axis of the traction wheel 200), forming an abutment, engagement, or nesting fit with it, thereby limiting the radial swaying, deflection, or accidental dislocation of the traction wheel 200 body. The embedding portion 322 can be integrally formed with the abutment portion 321. The abutment portion 321 abuts against the traction wheel 200 axially, while the embedding portion 322 is embedded in the notch structure of the traction wheel 200, limiting the traction wheel 200 radially. This provides axial and radial limiting of the traction wheel 200 through multiple points. The insert 322 is typically integrated with the abutment 321 (for axial restraint) in the same area of ​​the second housing 320, forming a combined radial and axial constraint to ensure that the traction wheel 200 is stably positioned in all three spatial dimensions when in the second position. This structure requires no additional fasteners and fully utilizes the housing's own geometry to achieve functional integration.

[0070] For example, the traction wheel 200 has a socket for inserting into the insert portion 322. The second fastening arm 210 is disposed on the inner edge of the socket. When the traction wheel 200 is in the second position, both the first fastening arm 110 and the second fastening arm 210 are in a fastening state with the fastening portion 313. When the first fastening arm 110 and the second fastening arm 210 are in the fastening state, they are on the same circumference in the direction of the first axis a. The insert portion 322 can be further extended in addition to being inserted into the traction wheel 200 and radially limiting the traction wheel 200. It extends into the socket of the traction wheel 200 and abuts against the first fastening arm 110 and / or the second fastening arm 210, so that the first fastening arm 110 and / or the second fastening arm 210 will not undergo unexpected elastic deformation, thereby preventing unexpected disengagement.

[0071] In this embodiment, the structure utilizes the structural features of the second housing 320 to reliably constrain the traction wheel 200 at the second position using the embedding part 322 of the second housing 320 without adding independent limiting parts. This is particularly suitable for endoscope 30 handle 10 in compact spaces where high assembly efficiency and structural strength are required. Simultaneously, while radially constraining the traction wheel 200, the embedding part 322 can also radially limit the first fastening arm 110 and / or the second fastening arm 210, preventing unintended elastic deformation and disengagement of the first fastening arm 110 and / or the second fastening arm 210.

[0072] In some embodiments, the lever 100 has a first limiting structure 120 on its side facing the traction wheel 200. For example, Figure 5 , Figure 9and Figures 13-18 As shown, the first limiting structure 120 can be a protrusion, a stop, a limiting rib, a hook, or a locally thickened stop surface. During the assembly process of the lever 100, as it travels along its insertion path (i.e., the assembly movement path), the lever 100 can make a predetermined contact or abutment with the second fastening arm 210 on the traction wheel 200, thereby pushing the traction wheel 200 to move from the first position to the second position. The first limiting structure 120 is designed so that when the lever 100 is fully inserted, it just abuts against the limiting surface (such as an end face or a step) of the second fastening arm 210 when the traction wheel 200 is in the second position, preventing the lever 100 from being over-inserted, causing the rotating shaft to shift, jam, or damage the internal structure.

[0073] Because the first latching arm 110 and the second latching arm 210 are the relatively protruding parts of the lever 100 and the traction wheel 200, and the first latching arm 110 and the second latching arm 210 form a rotation limit, and the first latching arm 110 and the second latching arm 210 are the main contact parts between the lever 100 and the traction wheel 200, the structure that limits the lever 100 and the traction wheel 200 is preferably set in the first latching arm 110 or the second latching arm 210, because the assembly process first completes the traction... The assembly of the pull wheel 200 to the first housing 310 involves the second fastening arm 210 being fastened first, followed by the assembly of the lever 100 (fastening of the first fastening arm 110). During the assembly of the lever 100, the first fastening arm 110 undergoes elastic deformation. If the traction wheel 200 is moved by relying on the limiting cooperation between the first fastening arm 110 and the pull wheel 200, the elastic deformation of the first fastening arm 110 will make the push of the lever 100 on the traction wheel 200 unstable. Therefore, the limiting structure for pushing the lever 100 to the traction wheel 200 mainly limits the second fastening arm 210 through other limiting structures of the lever 100, making the unlocking of the traction wheel 200 during assembly more stable and reliable.

[0074] In this embodiment, by setting a first limiting structure 120 on the lever 100 to cooperate with the second snap-fit ​​arm 210 at the upper limit of the assembly movement path, not only is the accuracy and consistency of the assembly guaranteed, but also the process of pushing the traction wheel 200 by the first snap-fit ​​arm 110 becomes unstable due to the elastic deformation of the first snap-fit ​​arm 110.

[0075] In some embodiments, the traction wheel 200 is provided with a second limiting structure 230 on its side facing the lever 100 or on its assembly path. For example, Figure 3 , Figure 4 , Figure 10 , Figure 11 , Figure 13 , Figure 15 , Figure 17 and Figure 18As shown, the second limiting structure 230 can be a boss, shoulder, limiting groove, stop surface, or locally thickened area, and its position corresponds to the movement trajectory of the first fastening arm 110 on the lever 100 during the assembly process. When the traction wheel 200 and the lever 100 approach each other during the insertion into the first housing 310, the second limiting structure 230 will contact or abut against the first fastening arm 110 on the assembly movement path, thereby causing the lever 100 to push the traction wheel 200 from the first position to the second position.

[0076] In this embodiment, by setting a second limiting structure 230 on the traction wheel 200 to cooperate with the first fastening arm 110 at the upper limit of the assembly movement path, not only is the fault tolerance and consistency of the assembly improved, but the initial positioning accuracy and linkage reliability between the lever 100 and the traction wheel 200 are also enhanced.

[0077] In some embodiments, the first housing 310 has a base 311, which engages with the shaft hole of the traction wheel 200. When the traction wheel 200 is in a first position, the base 311 and the traction wheel 200 are in a rotational limiting engagement; when the traction wheel 200 is in a second position, the base 311 and the traction wheel 200 are released from the rotational limiting engagement. For example, as... Figure 7 , Figures 9-16 and Figure 18 As shown, the base 311 can be a boss, a column, or a support structure with a central hole, and has a mating shaft portion that matches the central shaft hole of the traction wheel 200, for supporting the traction wheel 200 and allowing it to slide axially. The shaft hole of the traction wheel 200 is fitted onto the mating shaft portion, forming a sliding fit, so that the traction wheel 200 can move axially between a first position and a second position.

[0078] The outer circumference of the mating shaft portion of the base 311 is provided with a limiting key (or spline, flat section, non-circular cross section, etc.), while the inner wall of the shaft hole of the traction wheel 200 is provided with a corresponding limiting groove (or keyway, flat surface, etc.). When the traction wheel 200 is held in the first position by an elastic element (such as a spring) or in the initial assembly state, the limiting key is embedded in the limiting groove, locking the traction wheel 200 and the base 311 in the circumferential direction, preventing relative rotation. When the lever 100 pushes the traction wheel 200 to move axially to the second position, the shaft hole of the traction wheel 200 is displaced relative to the mating shaft portion of the base 311, causing the limiting groove to disengage from the limiting key (or enter the smooth cylindrical section of the shaft portion). At this time, the traction wheel 200 and the base 311 only maintain a rotational support relationship, without circumferential constraint, and the traction wheel 200 can rotate freely, facilitating the adjustment of the bending of the distal curved portion of the endoscope 30.

[0079] In this embodiment, the rotation transmission and release functions are integrated into the same mating interface through the combined function of the base 311 and the shaft hole of the traction wheel 200 (both supporting and limiting). The structure is compact and the action is clear, making it particularly suitable for medical device scenarios such as the endoscope 30 and the handle 10, where space is limited and the operational reliability requirements are extremely high.

[0080] In some embodiments, the lever 100 has an elastic portion 140. When the traction wheel 200 is in the second position, the elastic portion 140 has a spring force toward the traction wheel 200 under the action of the first housing 310, so that the lever 100 abuts against the traction wheel 200. For example, Figure 5 , Figure 9 and Figures 12-16 As shown, the lever 100 is integrally formed or assembled with an elastic part 140. The elastic part 140 can be an elastic arm, a cantilever beam, a bending spring, or a partially thin-walled structure, which has good rebound performance. When the lever 100 is installed in the first housing 310 and the traction wheel 200 is pushed to the second position, the inner wall of the first housing 310, the limiting step, or a specific clamping structure will apply a reaction force to the elastic part 140 of the lever 100, causing it to undergo elastic deformation, thereby forming a continuous elastic force in the direction of the traction wheel 200, which makes the pushing end or limiting end of the lever 100 always press against the traction wheel 200, preventing it from accidentally moving back or loosening.

[0081] In this embodiment, by integrating the elastic part 140 on the lever 100 and using the first housing 310 to constrain it to generate directional elastic force, reliable clamping and stable holding of the traction wheel 200 in the second position can be achieved without adding additional spring parts, taking into account structural simplification, cost control and operational reliability.

[0082] In some embodiments, the traction structure further includes a sealing ring 160 disposed between the first housing 310 and the lever 100, the sealing ring 160 being disposed around a mounting hole 315 in the first housing 310 for mounting the lever 100. For example, Figure 5 , Figure 9 and Figures 12-16 As shown, the first housing 310 has an annular groove or sealing step around the periphery of the mounting hole 315 (usually a through hole or stepped hole for the rotating shaft or operating shaft of the lever 100 to pass through) for mounting the lever 100. A sealing ring 160 (such as an O-ring, a shaped rubber ring, or a silicone gasket) is embedded in the groove and arranged around the entire mounting hole 315. When the lever 100 is inserted into the mounting hole 315 and the assembly is completed, the sealing ring 160 forms a radial or axial elastic sealing contact between the outer wall of the lever 100 and the inner wall of the mounting hole 315, effectively preventing external liquids (such as disinfectant, body fluids, and cleaning water) or dust from seeping into the endoscope 30 handle 10 through the gap between the lever 100 and the housing.

[0083] In this embodiment, by providing a sealing ring 160 around the mounting hole 315 of the lever 100 in the first housing 310, the environmental adaptability and safety of the endoscope 30 traction structure are effectively improved.

[0084] In some embodiments, the lever 100 is provided with a third limiting structure 130, and the first housing 310 is provided with a fourth limiting structure 314 that slides with the third limiting structure 130. The fourth limiting structure 314 and the third limiting structure 130 are mutually limiting at the beginning and end of the sliding motion to limit the maximum rotation angle of the traction wheel 200. For example, Figure 5 , Figure 9 and Figures 12-16 and Figure 18 As shown, the lever 100 is provided with a third limiting structure 130, which can be a protruding post, a limiting pin, a protrusion, or a locally thickened stop. Correspondingly, the first housing 310 is provided with a cooperating fourth limiting structure 314, which can be an arc-shaped groove, a guide rail, a limiting notch, or a slide with end baffles. The third limiting structure 130 is embedded or slidably fitted in the fourth limiting structure 314, and the two together constitute a guiding and angle limiting mechanism. During the process of the lever 100 rotating around the first axis a to push the traction wheel 200 to switch between the first position and the second position, the third limiting structure 130 slides along the trajectory of the fourth limiting structure 314. The fourth limiting structure 314 is provided with a stop surface, a boss or a closed end wall at the sliding start end and end end respectively. When the third limiting structure 130 abuts against these two ends respectively, it restricts the rotation stroke of the lever 100, thereby indirectly limiting the maximum rotation angle that the traction wheel 200 can reach (or more accurately, limiting the start and end positions of the lever 100 pushing the traction wheel 200 to move, thereby controlling the axial displacement range of the traction wheel 200 and its effective operating angle in the functional state).

[0085] In this embodiment, by providing a third limiting structure 130 and a fourth limiting structure 314 that slide against each other and limit at both ends between the lever 100 and the first housing 310, the rotation stroke of the lever 100 is precisely controlled, thereby reliably limiting the working position switching range of the traction wheel 200.

[0086] In some embodiments, the lever 100 further includes a toggle portion 150, which is distributed around the periphery of the first housing 310. The relative movement of the toggle portion 150 with respect to the periphery of the first housing can drive the lever 100 to rotate along a shaft parallel to the first axis a. For example, as shown... Figure 5 , Figure 9 and Figures 12-18As shown, the portion of the first housing 310 with the traction structure is approximately cylindrical. The actuating part 150 is located on the periphery of the first housing 310 and can move along the periphery of the first housing 310. The actuating part 150 is connected to the rotating shaft of the lever 100 via a connecting rod parallel to the radial direction of the mounting base.

[0087] In this embodiment, by providing a toggle part 150, the lever 100 can be operated to drive the traction wheel 200 to rotate by rotating the toggle part 150. The toggle part 150 amplifies the torque of the lever 100, making the lever 100 easier to rotate and the rotation more precisely controlling the traction wheel 200, thus improving operability.

[0088] Reference Figure 1 , Figure 2 , Figure 6 and Figure 7 This application also provides a handle 10, which includes the traction structure of the first aspect. The handle 10 has the same technical features as the traction structure provided in this application and can achieve the same technical effect, which will not be described in detail here.

[0089] Reference Figure 1 , Figure 2 , Figure 6 and Figure 7 This application also provides an endoscope 30, including a traction structure and a handle 10. The endoscope 30 has the same technical features as the traction structure and handle 10 provided in this application, and can achieve the same technical effect, which will not be described in detail here.

[0090] 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.

[0091] Furthermore, it should be noted that the scope of the methods and apparatus in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.

[0092] The above description is merely a specific embodiment of this application, but the scope of protection of this application 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 this application should be included within the scope of protection of this application.

Claims

1. A traction structure, characterized in that, For use in an endoscope, the endoscope includes a first housing (310), and the traction structure is disposed in the first housing (310), the traction structure including: A traction wheel (200) is movable relative to the first housing (310) between a first position and a second position. When the traction wheel (200) is in the first position, the traction wheel (200) is in a rotational limiting engagement with the first housing (310). When the traction wheel (200) is in the second position, the rotational limiting engagement with the first housing (310) is released. A lever (100) is rotatably disposed on the first housing (310) and can rotate relative to the first housing (310) about a first axis. When the traction wheel (200) is in the second position, the lever (100) is in a rotational limiting engagement with the traction wheel (200). During the assembly of the lever (100), at least a portion of the traction wheel (200) is located on the movement path of the lever (100), and the lever (100) can push the traction wheel (200) from the first position to the second position. When the traction wheel (200) is in the second position, the lever (100) engages with the traction wheel (200) in the first axial direction, restricting the traction wheel (200) from moving to the first position; when the traction wheel (200) is in the second position, the first housing (310) engages with the traction wheel (200) in the first axial direction, restricting the traction wheel (200) from moving away from the first housing (310); The first housing (310) has a fastening part (313), the lever (100) has a first fastening arm (110) that fastens to the fastening part (313), the traction wheel (200) has a second fastening arm (210) that fastens to the fastening part (313), and the first fastening arm (110) and the second fastening arm (210) are in a rotational limiting cooperation.

2. The traction structure according to claim 1, characterized in that, There is an interference gap (400) between the first fastening arm (110) and the second fastening arm (210) to prevent the first fastening arm (110) and the second fastening arm (210) from interfering with each other when elastic deformation occurs; And / or, at least one of the first snap-fit ​​arm (110) and the second snap-fit ​​arm (210) is provided with a transition surface (240) at a position corresponding to the interference gap (400) to prevent the first snap-fit ​​arm (110) and the second snap-fit ​​arm (210) from interfering at the interference gap (400) during assembly.

3. The traction structure according to claim 2, characterized in that, The endoscope further includes a second housing (320) having an abutment portion (321) which, when the traction wheel (200) is in the second position, abuts the traction wheel (200) against the traction wheel (200) to restrict the traction wheel (200) from moving away from the first housing (310); And / or, the second housing (320) also has an insert (322) that, when the traction wheel (200) is in the second position, engages radially with at least one of the traction wheel (200), the first fastening arm (110) and the second fastening arm (210).

4. The traction structure according to claim 2, characterized in that, The lever (100) has a first limiting structure (120) that engages with the second fastening arm (210) at the upper limit of the assembly movement path of the lever (100). And / or, the traction wheel (200) has a second limiting structure (230) that engages with the first snap-fit ​​arm (110) at the upper limit of the assembly movement path of the lever (100).

5. The traction structure according to claim 1, characterized in that, The first housing (310) has a base (311) that engages with the shaft hole of the traction wheel (200). When the traction wheel (200) is in the first position, the base (311) and the traction wheel (200) are in a rotational limiting engagement. When the traction wheel (200) is in the second position, the base (311) and the traction wheel (200) are released from the rotational limiting engagement.

6. The traction structure according to claim 1, characterized in that, The lever (100) has an elastic part (140), and when the traction wheel (200) is in the second position, the lever (100) abuts against the traction wheel (200) under the action of the elastic part (140). And / or, the traction structure further includes a sealing ring (160) disposed between the first housing (310) and the lever (100), the sealing ring (160) being disposed around a mounting hole (315) of the first housing (310) for mounting the lever (100).

7. The traction structure according to claim 1, characterized in that, The lever (100) is provided with a third limiting structure (130), and the first housing (310) is provided with a fourth limiting structure (314) that slides with the third limiting structure (130). The fourth limiting structure (314) and the third limiting structure (130) are limited to each other at the beginning and end of the sliding to limit the maximum rotation angle of the traction wheel (200).

8. A handle, characterized in that, It includes the first housing (310), the second housing (320), and the traction structure according to any one of claims 1-7.

9. An endoscope, characterized in that, Includes the handle as described in claim 8.

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