Insertion part and endoscope

Abstract

The invention relates to the technical field of endoscopes, and particularly discloses an insertion part and an endoscope, the insertion part comprises an active bending section, a passive bending section, a traction piece, a first sleeve and a second sleeve, the active bending section is connected to the far end of the passive bending section, the active bending section comprises a plurality of snake bone units, the far end of the traction piece is connected with the snake bone unit at the farthest end, and the first sleeve is connected with the second sleeve. The far end of the first sleeve is connected with the passive bending section, and the second sleeve is movably connected to the traction piece in a sleeving mode; when surgical operation is carried out in a narrow space, the traction piece can be pulled to enable the active bending section to be bent, meanwhile, the second sleeve is moved backwards, the part, exposed out of the second sleeve, of the far end of the active bending section can be bent by a small angle from far to near with the end of the second sleeve as a fulcrum, and when the surgical operation is carried out in a large space, the traction piece is pulled to enable the active bending section to be bent by a small angle from far to near. The second sleeve can be moved to be completely separated from the active bending section, so that the active bending section can sweep over a larger area to accurately reach a target position when the traction piece is pulled.

Description

Technical Field

[0001] The present invention relates to the technical field of endoscopes, and in particular to an insertion portion and an endoscope. Background Art

[0002] An endoscope is a medical device that inserts an insertion part into the human body and observes the internal tissues of the human body through a camera module at the far end of the insertion part. It can help doctors determine the location of lesions in the patient's body and the tissue structure characteristics of the lesion location.

[0003] The endoscope includes an operating handle and an insertion part. In actual operation, the first wheel is driven to rotate by turning the lever on the operating handle to adjust the posture of the active bending section of the insertion part, thereby adjusting the direction of the distal module to achieve functions such as fixed-point observation.

[0004] However, the inventors discovered that when the active bending section at the distal end of the insertion portion is bending, the proximal end bends before the distal end. This bending method causes the distal end of the active bending section to sweep a larger area during the bending process. When the doctor uses it during surgery, if it is necessary to bend the active bending section to the subrenal calyx end, the operation is difficult. If the active bending section is improved to bend in a manner in which the distal end bends before the proximal end, the bending radius of the active bending section will be smaller. In a larger surgical space, since there is not enough surrounding tissue to form a stable support for the insertion section, the insertion section may lack external constraints, causing the active bending section of the insertion section to be easily over-bent and unable to accurately reach the target position. Summary of the invention

[0005] The present invention discloses an insertion part and an endoscope to solve the above technical problems existing in the related art.

[0006] In order to solve the above problems, the present invention adopts the following technical solutions: In a first aspect, the present application provides an insertion portion, which includes an active bending section, a passive bending section, a traction member, a first sleeve and a second sleeve, wherein the active bending section is connected to the distal end of the passive bending section, the active bending section includes a plurality of snake bone units connected end to end, the distal end of the traction member is connected to the farthest snake bone unit, the distal end of the first sleeve is connected to the passive bending section, and the second sleeve is movably sleeved on the traction member.

[0007] In the second aspect, the present application also provides an endoscope, comprising an operating handle and the aforementioned insertion part, the proximal end of the insertion part is connected to the operating handle, a first traction mechanism and a second traction mechanism are arranged in the operating handle, the proximal end of the traction member is connected to the first traction mechanism, the proximal end of the second sleeve is connected to the second traction mechanism, the first traction mechanism is connected to the second traction mechanism, so that the traction member and the second sleeve move synchronously.

[0008] The technical solution adopted by the present invention can achieve the following beneficial effects: In the insertion part and endoscope of the present application, in the initial state, the distal end of the second sleeve extends to the distal end of the active bending section. Based on the restraining effect of the second sleeve, the entire active bending section is subjected to a large bending damping. When the distal end of the insertion part performs a surgical operation in a narrow space, the second sleeve can be moved backward while pulling the active bending section to cause bending, so that the active bending section has a first part exposed to the second sleeve and a second part hidden in the second sleeve. Since the second sleeve releases the restraining effect on the first part, the bending damping of the first part is smaller than the bending damping of the second part. When the traction member is pulled, the first part can be bent preferentially with the distal end of the second sleeve as a fulcrum. Based on the continuous backward movement of the second sleeve, the entire active bending section bends at a small angle from far to near, thereby avoiding the risk of a large overall sweeping area due to the preferential bending of the proximal end of the active bending section, which is easy to cause mucosal scraping or collision with the inner wall of the cavity in a narrow space; When the distal end of the insertion portion is performing a surgical operation in a larger space, the second sleeve can be moved backward to completely separate the second sleeve from the active bending section in the axial direction. In this way, when the traction member is pulled, the entire active bending section uses the distal end of the passive bending section as a fulcrum to bend at a large angle from near to far. The preferential bending of the proximal end of the active bending section can drive the adjustment of the direction of the entire active bending section, and the swept area is larger, so that the operator can make the camera module at the distal end of the active bending section reach the target position more easily, thereby improving the efficiency and success rate of the operation; At the same time, by moving the second sleeve to change its relative position relationship with the active bending section, the length of the first part and the second part can be adjusted. Therefore, the operator can adaptively adjust the position of the second sleeve according to the size of the working space where the insertion part is located, so that the length of the first part matches the size of the working space. This can avoid the problem of a large swept area and easy scratching of the inner wall due to the proximal preferential bending of the active bending section, and can also avoid the problem of a small bending radius due to the distal preferential bending of the active bending section, which cannot accurately reach the target position due to the lack of stable support in a larger surgical space. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0010] Figure 1 is a schematic structural diagram of an insertion portion of an embodiment of the present application; Figure 2 yes Figure 1 A local enlarged schematic diagram of the middle A; Figure 3 yes Figure 1 A partial enlarged schematic diagram of point B in the middle; Figure 4 is a schematic structural diagram of an endoscope according to an embodiment of the present application; Figure 5 is a schematic diagram of the internal structure of the operating handle of an embodiment of the present application; Figure 6 is a schematic diagram of the connection between the first traction mechanism and the second traction mechanism of the embodiment of the present application; Figure 7 This is one of the transmission matching diagrams of the second wheel disc, the first gear, the second gear and the rack in the embodiment of the present application; Figure 8 This is the second schematic diagram of the transmission coordination of the second wheel disc, the first gear, the second gear and the rack in the embodiment of the present application; Fig. 9 It is a schematic diagram of the assembly of the first traction mechanism and the second traction mechanism of an embodiment of the present application.

[0011] In the figure: 100, insertion part; 110, active bending section; 111, snake bone unit; 120, passive bending section; 130, traction member; 140, first sleeve; 150, second sleeve; 200, operating handle; 210, first traction mechanism; 211, first wheel plate; 212, first knob; 213, first shaft rod; 220, second traction mechanism; 221, second wheel plate; 2211, first tooth pattern; 2212, second tooth pattern; 222, first gear; 2221, first gear ring; 2222, second gear ring; 223, second gear; 2231, third gear ring; 2232, fourth gear ring; 224, rack; 225, second knob; 226, second shaft rod; 230, elastic mechanism; 240, locking assembly; 241, third knob; 242, third shaft rod. DETAILED DESCRIPTION

[0012] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0013] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0014] The following is combined with Figure 1 to Figure 9 , the insertion part and the endoscope provided in the embodiments of the present application are described in detail through specific embodiments and their application scenarios.

[0015] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 The present application discloses an insertion portion 100, which is applied to an endoscope. Specifically, the insertion portion 100 includes an active bending section 110, a passive bending section 120, a traction member 130, a first sleeve 140 and a second sleeve 150, wherein the active bending section 110 is connected to the distal end of the passive bending section 120. For example, the active bending section 110 can be formed by hingedly connecting a plurality of snake bone units 111 connected end to end, and the passive bending section 120 can be a multi-layer tubular structure. Typically, the passive bending segment 120 may include a braided mesh tube, a spiral tube and an outer covering layer distributed from the inside to the outside. The distal end of the traction member 130 is connected to the snake bone unit 111 at the farthest end of the active bending segment 110. Exemplarily, the traction member 130 may be a metal traction rope, which may be connected to the snake bone unit 111 by welding. The proximal end of the traction member 130 is connected to the operating handle 200 of the endoscope. By operating the operating handle 200, the traction member 130 can be pulled, thereby causing the active bending segment 110 to bend.

[0016] In the embodiment of the present application, the distal end of the first sleeve 140 is connected to the passive bending section 120. For example, the distal end of the first sleeve 140 is located at the junction of the active bending section 110 and the passive bending section 120, and the first sleeve 140 can be fixed to the inner wall of the passive bending section 120. The second sleeve 150 is movably sleeved on the traction member 130, and the traction member 130 and the second sleeve 150 are jointly arranged in the first sleeve 140. On the one hand, the first sleeve 140 can flexibly connect the traction member 130 and the first sleeve 150. The second sleeve 150 plays a certain protective role, reducing the friction between the traction member 130 and the second sleeve 150 and the inner wall of the passive bending section 120 or other components. On the other hand, the first sleeve 140 can restrain and position the traction member 130 and the second sleeve 150. This restraint and positioning effect limits the radial movement of the traction member 130 and the second sleeve 150, avoiding bending and wrinkling of the traction member 130 during the pulling process and the second sleeve 150 during the movement process.

[0017] Based on the above technical solution, when the insertion part of the embodiment of the present application is used in a specific application, in the initial state, the distal end of the second sleeve 150 extends to the distal end of the active bending section 110. Based on the restraining effect of the second sleeve 150, the bending damping of the entire active bending section 110 is relatively large. When the distal end of the insertion portion 100 is performing a surgical operation in a narrow space, the second sleeve 150 can be moved backward while the active bending section 110 is pulled to bend, so that the active bending section 110 has a first part exposed from the second sleeve 150 and a second part hidden in the second sleeve 150. Since the second sleeve 150 releases the constraint on the first part, the bending damping of the first part is smaller than that of the second part. When the traction member 130 is pulled, the first part can be bent preferentially with the distal end of the second sleeve 150 as a fulcrum. Based on the continuous backward movement of the second sleeve 150 and the continuous pulling action on the traction member 130, the entire active bending section 110 is bent at a small angle from far to near, thereby avoiding the risk of a large overall sweeping area due to the preferential bending of the proximal end of the active bending section 110, which may easily cause mucosal scraping or collision with the inner wall of the cavity in a narrow space.

[0018] When the distal end of the insertion portion 100 is performing surgery in a larger space, the second sleeve 150 can be moved backward to completely separate the second sleeve 150 from the active bending section 110 axially. In this way, when the traction member 130 is pulled, the entire active bending section 110 is bent at a large angle from near to far with the distal end of the passive bending section 120 as a fulcrum. The preferential bending of the proximal end of the active bending section 110 can drive the adjustment of the direction of the entire active bending section 110. The active bending section 110 sweeps over a larger area when bending, so that the operator can make the camera module at the distal end of the active bending section 110 reach the target position more easily, thereby improving the efficiency and success rate of the operation.

[0019] It should be noted that if the first part includes at least two snake bone units 111, when the traction member 130 is pulled, the snake bone unit 111 located on the distal side can bend preferentially with the snake bone unit 111 on the proximal side as a fulcrum, that is, the first part itself also bends from near to far. Based on this situation, in the embodiment of the present application, the lengths of the first part and the second part can be adjusted by moving the second sleeve 150 to change its relative position relationship with the active bending section 110. Therefore, the operator can adaptively adjust the position of the second sleeve 150 according to the size of the working space where the insertion part 100 is located, so that the length of the first part matches the size of the working space. In this way, the problem of a large swept area and easy scraping with the inner wall caused by the preferential bending of the proximal end of the active bending section 110 can be avoided, and the problem of a small bending radius caused by the preferential bending of the distal end of the active bending section 110 and the inability to accurately reach the target position due to lack of stable support in a larger surgical space can be avoided. It can be understood that in the embodiment of the present application, the moving distance of the second sleeve 150 should be greater than the moving distance of the traction member 130, so that the second sleeve 150 will not interfere with the bent snake unit 111 after moving.

[0020] See also Figure 4 The embodiment of the present application further discloses an endoscope, which includes an operating handle 200 and the aforementioned insertion portion 100 , and the proximal end of the insertion portion 100 is connected to the operating handle 200 .

[0021] As can be seen from the foregoing, when the insertion portion 100 enters the human body cavity for surgical operation, it is necessary to pull the traction member 130 to bend the active bending section 110, and to move the second sleeve 150 backward or forward to adjust its relative position relationship with the active bending section 110. Based on this situation, please refer to Figure 5 , Figure 6 , Figure 7 , Figure 8 and Fig. 9A first traction mechanism 210 and a second traction mechanism 220 are disposed in the operating handle 200 , wherein the proximal end of the traction member 130 is connected to the first traction mechanism 210 , and the proximal end of the second sleeve 150 is connected to the second traction mechanism 220 .

[0022] Exemplarily, the first traction mechanism 210 includes a first wheel disc 211, the proximal end of the traction member 130 is connected and fixed to the first wheel disc 211, and the operating handle 200 is provided with a first knob 212 which is transmission-connected to the first wheel disc 211. Exemplarily, the first knob 212 is coaxially connected to the first wheel disc 211 through a first shaft 213, and the bending action of the active bending section 110 can be achieved by rotating the first knob 212.

[0023] For example, see Figure 6 , Figure 7 , Figure 8 and Fig. 9 The second traction mechanism 220 may include a second wheel disc 221 and a rack 224 that is transmission-matched with the second wheel disc 221. The second wheel disc 221 is rotatably disposed in the operating handle 200, and the rack 224 is slidably matched in the operating handle 200. The proximal end of the second sleeve 150 may be connected and fixed to the rack 224. The operating handle 200 is provided with a second knob 225 that is transmission-connected with the second wheel disc 221. Exemplarily, the second knob 225 may be coaxially connected to the second wheel disc 221 via a second shaft 226. By rotating the second knob 225, the second wheel disc 221 can be driven to rotate, thereby causing the rack 224 to slide in the operating handle 200, thereby achieving pulling the second sleeve 150 backward or pushing it forward.

[0024] In the embodiment of the present application, the first traction mechanism 210 can be connected to the second traction mechanism 220. Based on the connection relationship between the two, it is only necessary to rotate the first knob 212 or the second knob 225 on the operating handle 200 to achieve the synchronous action of the traction member 130 and the second sleeve 150. That is to say, during the continuous retraction of the second sleeve 150, the part of the active bending section 110 exposed outside the second sleeve 150 continues to bend, thereby ensuring that the active bending section 110 bends from far to near and reducing the operating difficulty of the operator.

[0025] In some embodiments of the present application, the operating handle 200 is further provided with an elastic mechanism 230, which is configured to apply an elastic force to one of the first wheel disc 211 or the second wheel disc 221, so that the first wheel disc 211 and the second wheel disc 221 are tightly combined to transmit torque. In this way, when any one of the first knob 212 and the second knob 225 is turned, the active bending section 110 bends and the second sleeve 150 is pulled backward.

[0026] During the research process, the inventor discovered that if the second wheel disc 221 and the first wheel disc 211 are rotated synchronously in the same direction, for the active bending section 110, the different rotation directions of the first wheel disc 211 will cause the active bending section 110 to bend toward its first side or second side, but for the synchronously rotating second wheel disc 221, the different rotation directions will switch between pushing the second sleeve 150 forward and pulling the second sleeve 150 backward. Therefore, how to achieve the active bending section 110 bending toward its first side or second side while the second sleeve 150 is pulled backward is the key to the synchronous action of the traction member 130 and the second sleeve 150.

[0027] Based on the above problems, in some embodiments of the present application, the second traction mechanism 220 also includes a first gear 222 and a second gear 223, wherein the first gear 222 and the second gear 223 are both rotatably disposed in the operating handle 200, the rack 224 is slidably disposed in the operating handle 200, the first gear 222 and the second gear 223 are meshed with each other, the second gear 223 is meshed with the rack 224, and the proximal end of the second sleeve 150 is connected and fixed to the rack 224.

[0028] The outer edge of the second wheel disc 221 is provided with a first tooth pattern 2211 and a second tooth pattern 2212. The first tooth pattern 2211 and the second tooth pattern 2212 are staggered along the axial direction of the second wheel disc 221, and the first tooth pattern 2211 and the second tooth pattern 2212 are connected in the circumferential direction of the second wheel disc 221. The first tooth pattern 2211 is configured to mesh with the second gear 223 correspondingly when the second wheel disc 221 rotates and be separated from the first gear 222 without contact. The second tooth pattern 2212 is configured to mesh with the first gear 222 correspondingly when the second wheel disc 221 rotates and be separated from the second gear 223 without contact.

[0029] In this configuration, in the initial state, the first gear 222 is located between the first tooth pattern 2211 and the second tooth pattern 2212. When the operator rotates the first knob 212 or the second knob 225 in the first direction, the first direction may be Figure 1In the counterclockwise direction, the active bending section 110 is bent toward the first side, and the first tooth pattern 2211 is directly meshed with the second gear 223 to make the second gear 223 rotate clockwise. At this time, the first gear 222 meshed with the second gear 223 is in an idling state, and the rack 224 meshed with the second gear 223 moves toward the proximal side of the operating handle 200, thereby achieving the pulling of the second sleeve 150 toward the proximal end, that is, when the first knob 212 or the second knob 225 is rotated along the first direction, the bending action of the active bending section 110 toward the first side and the retreat action of the second sleeve 150 are performed synchronously. In this process, the snake bone unit 111 that is first exposed outside the second sleeve 150 is preferentially bent relative to the snake bone unit 111 located at its proximal end, so as to achieve the bending action of the entire active bending section 110 from far to near. It can be understood that when the first knob 212 or the second knob 225 is rotated clockwise, the distal end of the insertion portion 100 can return to its initial state, and the second sleeve 150 can be pushed forward to be sleeved on the portion of the traction member 130 corresponding to the active bending section 110 .

[0030] When the first gear 222 is located between the first tooth pattern 2211 and the second tooth pattern 2212, the operator rotates the first knob 212 or the second knob 225 in the second direction. For example, the second direction may be Figure 1 In the clockwise direction, the active bending section 110 is bent toward the second side, and the second tooth pattern 2212 is directly meshed with the first gear 222 to make the first gear 222 rotate counterclockwise, while the second gear 223 meshed with the first gear 222 still rotates clockwise, and the rack 224 meshed with the second gear 223 moves toward the proximal side of the operating handle 200, thereby pulling the second sleeve 150 toward the proximal end. That is to say, based on the transmission matching relationship among the second wheel plate 221, the first gear 222 and the second gear 223, the second sleeve 150 can achieve a synchronous retreat action when the active bending section 110 is bent toward the first side or the second side. This design method in which the first traction mechanism 210 and the second traction mechanism 220 are connected to make the active bending section 110 and the second sleeve 150 move synchronously greatly simplifies the difficulty of integrating the components of the operating handle 200 and reduces the difficulty of operation for the operator.

[0031] In the embodiment of the present application, the first gear 222 has a first gear ring 2221 and a second gear ring 2222 that are spaced apart, the first gear ring 2221 is used to mesh with the second tooth pattern 2212, and the second gear ring 2222 is used to mesh with the second gear 223; similarly, the second gear 223 has a third gear ring 2231 and a fourth gear ring 2232 that are spaced apart, the third gear ring 2231 is used to mesh with the first tooth pattern 2211, and the fourth gear ring 2232 is used to mesh with the first gear 222.

[0032] As can be seen from the foregoing, the second sleeve 150 can be moved to change its relative positional relationship with the active bending section 110, and the length of the first part and the second part can be adjusted, so that the insertion part 100 can adapt to surgical spaces of different sizes. Based on this situation, the first traction mechanism 210 and the second traction mechanism 220 in the embodiment of the present application are preferably connected in a clutchable manner. In this way, when the first traction mechanism 210 and the second traction mechanism 220 are engaged, the operator can turn the first knob 212 or the second knob 225 to synchronize the active bending section 110 and the second sleeve 150. When the first traction mechanism 210 and the second traction mechanism 220 are separated, the operator can adjust the position of the second sleeve 150 relative to the active bending section 110 through the second traction mechanism 220 alone, so that the distribution of the first part and the second part can adapt to the surgical space.

[0033] Specifically, see Figure 6 and Fig. 9 The first shaft 213 and the second shaft 226 can be coaxially arranged so that the first wheel disc 211 and the second wheel disc 221 are coaxially distributed. Specifically, the first shaft 213 can be a hollow structure, and the second shaft 226 is axially penetrated in the first shaft 213 and is connected and fixed to the second wheel disc 221. The elastic mechanism 230 may include a spring, and the spring is located on the side of the second wheel disc 221 facing away from the first wheel disc 211. One end of the spring is against the inner wall of the operating handle 200, and the other end of the spring is against the second wheel disc 221. In this way, in the initial state, the spring applies an elastic force to the second wheel disc 221, so that the second wheel disc 221 is tightly combined with the first wheel disc 211. In this way, when the first knob 212 or the second knob 225 is turned, the second wheel disc 221 and the first wheel disc 211 can transmit torque to each other. When it is necessary to separate the first wheel disc 211 and the second wheel disc 221 from each other, the second knob 225 is pressed, and the second wheel disc 221 is axially separated from the first wheel disc 211. At this time, the operator can operate the second knob 225 alone to adjust the position of the second sleeve 150 relative to the active bending section 110, so that the first part exposed outside the second sleeve 150 is adapted to the current size of the surgical space.

[0034] It should be noted that in the embodiments of this application, see Figure 6 and Figure 8The third gear ring 2231 of the second gear 223 can be two axially distributed, one of the third gear rings 2231 is meshed with the first tooth pattern 2211 of the second wheel disc 221 in the combined state, and the other third gear ring 2231 is meshed with the first tooth pattern 2211 of the second wheel disc 221 in the separated state. In this way, when the second knob 225 is pressed to make the second wheel disc 221 move axially and separate from the first wheel disc 211, the second wheel disc 221 can still drive the second sleeve 150 to move through the first gear 222, the second gear 223 and the rack 224.

[0035] In a further technical solution, a first friction structure is provided on the side of the first wheel disc 211 facing the second wheel disc 221, and a second friction structure is provided on the side of the second wheel disc 221 facing the first wheel disc 211. When the first traction mechanism 210 is combined with the second traction mechanism 220, the first friction structure and the second friction structure are in frictional contact to transmit torque, thereby avoiding slippage between the first wheel disc 211 and the second wheel disc 221 and affecting the synchronous movement of the two, resulting in excessive bending damping of the active bending section 110 (rotation lag of the second wheel disc 221) or a large area swept by the active bending section 110 (rotation lag of the first wheel disc 211).

[0036] In an optional embodiment, the first friction structure may be a third tooth pattern provided on the surface of the first wheel disc 211, the third tooth pattern extends from the middle of the first wheel disc 211 to the edge of the first wheel disc 211, and a plurality of third tooth patterns are densely distributed along the circumference of the first wheel disc 211; the second friction structure may be a fourth tooth pattern provided on the surface of the second wheel disc 221, the fourth tooth pattern extends from the middle of the second wheel disc 221 to the edge of the second wheel disc 221, and a plurality of fourth tooth patterns are densely distributed along the circumference of the second wheel disc 221. In such a configuration, when the spring applies an axial extrusion force, the first wheel disc 211 and the second wheel disc 221 increase the circumferential friction between the two through the engagement of the third tooth pattern and the fourth tooth pattern, so that when one of the first wheel disc 211 and the second wheel disc 221 is driven to rotate, it can drive the other to rotate synchronously, thereby avoiding the occurrence of slipping.

[0037] In another optional embodiment, the first friction structure may be a damping plate or a spike structure provided on the first wheel disc 211, and the second friction structure may be a spike structure or a damping plate provided on the second wheel disc 221, and the damping plate and the spike structure are correspondingly arranged on the first wheel disc 211 and the second wheel disc 221. Exemplarily, the damping plate may be a structural member made of polyurethane material, nitrile rubber or fluororubber, and under the elastic force of the elastic mechanism 230, the spikes are tightly pressed against the damping plate so that the first wheel disc 211 and the second wheel disc 221 can transmit torque and rotate synchronously.

[0038] In the embodiment of the present application, the operating handle 200 is further provided with a locking assembly 240, and the locking assembly 240 is used to lock the first traction mechanism 210 and the second traction mechanism 220. For details, see Figure 1 , Figure 4 and Fig. 9 After operating the first knob 212 or the second knob 225 to make the active bending section 110 bend to the adapted position in the surgical space, the current posture of the active bending section 110 can be locked by the locking assembly 240 to prevent the active bending section 110 from shaking randomly and affecting the surgical operation. The locking assembly 240 includes a third knob 241 and a third shaft 242 connected to the third knob 241. The third knob 241 is coaxially arranged with the first knob 212 and the second knob 225. The first knob 212, the second knob 225 and the third knob 241 are coaxially arranged with each other. 41 are arranged from inside to outside, the second shaft 226 is a hollow structure, the third shaft 242 is movably arranged in the second shaft 226, and the third shaft 242 is provided with a threaded section at one end facing away from the third knob 241, and the threaded section is used to threadably cooperate with the threaded hole in the operating handle 200. During specific operation, when the active bending section 110 is bent to a suitable position, the third knob 241 can be rotated to press the second knob 225 and the first knob 212, thereby realizing the locking of the first traction mechanism 210 and the second traction mechanism 220.

[0039] It should be noted that, in this article, the term "comprises", "includes" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the method and device in the embodiment of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0040] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An insertion portion, characterized in that: It comprises an active bending section (110), a passive bending section (120), a traction member (130), a first sleeve (140) and a second sleeve (150); wherein: The active bending section (110) is connected to the distal end of the passive bending section (120), the active bending section (110) comprises a plurality of snake bone units (111) connected end to end, the distal end of the traction member (130) is connected to the distalmost snake bone unit (111), the distal end of the first sleeve (140) is connected to the passive bending section (120), and the second sleeve (150) is movably sleeved on the traction member (130).

2. The insertion portion according to claim 1, characterized in that: The second sleeve (150) is a threaded tube.

3. An endoscope, characterized in that: It comprises an operating handle (200) and an insertion portion according to any one of claims 1 to 2, wherein the proximal end of the insertion portion is connected to the operating handle (200); wherein: A first traction mechanism (210) and a second traction mechanism (220) are arranged in the operating handle (200); the proximal end of the traction member (130) is connected to the first traction mechanism (210); the proximal end of the second sleeve (150) is connected to the second traction mechanism (220); the first traction mechanism (210) is connected to the second traction mechanism (220), so that the traction member (130) and the second sleeve (150) move synchronously.

4. The endoscope according to claim 3, characterized in that The first traction mechanism (210) and the second traction mechanism (220) are connected in a clutchable manner; when the first traction mechanism (210) and the second traction mechanism (220) are connected, the traction member (130) can move synchronously with the second sleeve (150).

5. The endoscope according to claim 4, characterized in that The second traction mechanism (220) comprises a second wheel disc (221), a first gear (222), a second gear (223) and a rack (224); wherein: The first gear (222) is meshed with the second gear (223), the second gear (223) is meshed with the rack (224), the first gear (222) is meshed with the rack (224), and the proximal end of the second sleeve (150) is connected and fixed to the rack (224); A first tooth pattern (2211) and a second tooth pattern (2212) connected in a circumferential direction are arranged on the outer edge of the second wheel disc (221), and the first tooth pattern (2211) and the second tooth pattern (2212) are staggeredly distributed along the axial direction of the second wheel disc (221), and the first tooth pattern (2211) is configured to mesh with the second gear (223) when the second wheel disc (221) rotates, and the second tooth pattern (2212) is configured to mesh with the first gear (222) when the second wheel disc (221) rotates, so that the rack (224) pulls the second sleeve (150) to move toward the proximal end of the insertion portion.

6. The endoscope according to claim 5, characterized in that The first gear (222) has a first gear ring (2221) and a second gear ring (2222) arranged at an interval, the first gear ring (2221) is used to mesh with the second tooth pattern (2212), and the second gear ring (2222) is used to mesh with the second gear (223); And / or, the second gear (223) has a third gear ring (2231) and a fourth gear ring (2232) arranged at an interval, the third gear ring (2231) is used to mesh with the first tooth pattern (2211), and the fourth gear ring (2232) is used to mesh with the first gear (222).

7. The endoscope according to claim 5, characterized in that The first traction mechanism (210) comprises a first wheel disc (211), the proximal end of the traction member (130) is connected to the first wheel disc (211), and the first wheel disc (211) and the second wheel disc (221) are coaxially arranged; When the first traction mechanism (210) and the second traction mechanism (220) are connected in a detachable manner, an elastic mechanism (230) is further provided in the operating handle (200), the second wheel disc (221) is fixedly arranged in its axial direction, and the first wheel disc (211) is movably arranged in its axial direction, and the elastic mechanism (230) is configured to apply an elastic force to the first wheel disc (211), so that the first wheel disc (211) and the second wheel disc (221) are tightly engaged.

8. The endoscope according to claim 7, characterized in that A first friction structure is provided on a side of the first wheel disc (211) facing the second wheel disc (221), and a second friction structure is provided on a side of the second wheel disc (221) facing the first wheel disc (211); when the first traction mechanism (210) is engaged with the second traction mechanism (220), the first friction structure is in frictional contact with the second friction structure to transmit torque.

9. The endoscope according to claim 7, characterized in that: The operating handle (200) is also provided with a locking assembly (240), and the locking assembly (240) is used to lock the first traction mechanism (210) and the second traction mechanism (220).

10. The endoscope according to claim 9, characterized in that The first traction mechanism (210) further comprises a first knob (212) and a first shaft (213); the first knob (212) is connected and fixed to the first wheel disc (211) via the first shaft (213); The second traction mechanism (220) further comprises a second knob (225) and a second shaft (226); the second knob (225) is connected and fixed to the second wheel disc (221) via the second shaft (226); the first shaft (213) is a hollow structure; the second shaft (226) is coaxially disposed inside the first shaft (213); The locking assembly (240) comprises a third knob (241) and a third shaft (242) connected to the third knob (241); the second shaft (226) is a hollow structure; the third shaft (242) is inserted into the second shaft (226); and the third shaft (242) is threadably matched with an inner wall of the operating handle (200).

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