Endoscope and its transmission mechanism

Abstract

The present invention provides an endoscope and a transmission mechanism thereof. The transmission mechanism can be used to drive the endoscope's forceps lifter to lift and return. The transmission mechanism includes a rotating wheel, a driven gear and a rack. The rotating wheel can rotate around its own center, and its outer edge is provided with a latching tooth; the driven gear is meshed with the latching tooth to follow the rotating wheel; the rack can be connected to the endoscope's forceps lifter; the rack is meshed with the driven gear to follow the driven gear, thereby driving the forceps lifter to lift and return. During the driving process of the transmission mechanism, the rotating wheel and the driven gear both rotate around their own centers. In the limited space of the endoscope, the driven gear will not occupy a large rotation space to avoid interference between the transmission mechanism and other components. At the same time, the driven gear effectively cooperates with the rotating wheel and the rack, and can also effectively avoid the occurrence of the jamming of various components during the driving process, thereby ensuring the flexibility of the transmission mechanism in driving the forceps lifter and ensuring the smooth progress of the endoscopic surgery.

Description

Technical Field

[0001] The present invention relates to the technical field of medical equipment, and in particular to an endoscope and a transmission mechanism thereof. Background Art

[0002] An endoscope is a commonly used medical device that can enter the patient's body through natural orifices of the human body or through an incision made during surgery, allowing medical staff to observe diseased areas in the body and provide targeted treatment.

[0003] In some targeted surgeries, an endoscope usually needs to be used in conjunction with surgical instruments, such as biopsy forceps, to remove diseased tissue. The endoscope has a channel for the surgical instrument to pass through, and a forceps lifter is provided in the channel to drive the surgical instrument to lift.

[0004] At present, the internal part of the endoscope is driven by a connecting rod mechanism to move the forceps lifter. Specifically, in the connecting rod mechanism, the manual lever rotates with the rotating wheel as a whole, which can drive the connecting rod connected to the rotating wheel, so that the connecting rod pushes the straight rod connected thereto, thereby realizing the movement of the forceps lifter through the linear drive of the straight rod.

[0005] Although the connecting rod mechanism can realize the lifting and returning of the forceps lifter, the driving process requires the articulation drive of the connecting rod and the rotating wheel, and the articulation drive of the straight rod and the connecting rod. The connecting rod is articulated with the rotating wheel and the straight rod respectively. When converting the circular motion of the rotating wheel into the linear motion of the straight rod, the connecting rod needs a large rotation space. In the limited internal space of the endoscope, the connecting rod can easily interfere with other parts during movement, causing the connecting rod to get stuck or even deform and break, thus affecting the smooth progress of the endoscopic surgery. Summary of the invention

[0006] The purpose of the present invention is to solve the technical problem that in the prior art endoscope, the connecting rod of the connecting rod mechanism driving the forceps lifting device is easily stuck or even deformed and broken during the movement, thereby affecting the smooth progress of the endoscopic surgery.

[0007] In order to solve the above technical problems, the present invention provides a transmission mechanism of an endoscope, which can be used to drive the forceps lifter of the endoscope to lift and return. The transmission mechanism includes a rotating wheel, a driven gear and a rack. The rotating wheel is arranged inside the shell of the endoscope. The rotating wheel can rotate around its own center. The outer edge of the rotating wheel is provided with a latching tooth; the driven gear is engaged with the latching tooth on the outer edge of the rotating wheel to follow the rotating wheel; the rack can be used to connect with the forceps lifter of the endoscope; the rack is engaged with the driven gear to follow the driven gear, thereby driving the forceps lifter to lift and return.

[0008] Optionally, the transmission mechanism further includes a transition gear, through which the driven gear meshes with the latching teeth of the rotating wheel; the transition gear meshes with the latching teeth of the rotating wheel and the driven gear respectively to drive the driven gear to rotate when the rotating wheel rotates.

[0009] Optionally, the outer diameter of the driven gear is greater than the outer diameter of the transition gear.

[0010] Optionally, the transmission mechanism also includes a guide rail, which is fixed inside the shell of the endoscope; the extension direction of the guide rail is consistent with the moving direction of the rack; a receiving cavity is provided inside the guide rail, and the rack is movably arranged in the receiving cavity, and an opening is provided on one side of the guide rail for the tooth portion of the rack to pass through and engage with the driven gear.

[0011] Optionally, the rotating wheel, the driven gear and the rack are all plastic parts.

[0012] The present invention also provides an endoscope, comprising an operating member and an insert connected to the operating member, the endoscope also comprising the above-mentioned transmission mechanism, which is arranged inside the shell of the operating member; the endoscope also comprises a forceps lifter, which is arranged in the insert, and the rack of the transmission mechanism is connected to the forceps lifter to drive the forceps lifter to lift and return.

[0013] Optionally, the endoscope further comprises a pull rope, and the rack is fixed to the forceps elevator via the pull rope.

[0014] Optionally, the endoscope further comprises a sleeve member, the interior of which is hollow; the sleeve member is fixed inside the housing of the operating member, and the pull rope is passed through the sleeve member.

[0015] Optionally, the sleeve member is a spring sleeve or a stainless steel capillary.

[0016] Optionally, the endoscope further comprises a spring sleeve, wherein the spring sleeve is fixed inside the housing of the operating member, and the pull rope is passed through the spring sleeve.

[0017] Optionally, the endoscope further comprises a lever, wherein the lever is fixed to a rotating wheel of the transmission mechanism to control the rotation of the rotating wheel.

[0018] It can be seen from the above technical solution that the beneficial effects of the present invention are:

[0019] In the endoscope and its transmission mechanism of the present invention, the driven gear meshes with the teeth on the outer edge of the rotating wheel, so that the driven gear follows the rotation of the rotating wheel, and the rotating driven gear drives the rack meshed with it to make linear motion, so that the rack drives the forceps lifter, thereby realizing the lifting and returning of the forceps lifter. During the driving process of the transmission mechanism, the rotating wheel and the driven gear both rotate around their own centers. In the limited space of the endoscope, the driven gear will not occupy a large rotation space to avoid interference between the transmission mechanism and other components. At the same time, the driven gear effectively cooperates with the rotating wheel and the rack, and can also effectively avoid the occurrence of the jamming of various components during the driving process, ensuring the flexibility of the transmission mechanism to drive the forceps lifter and ensuring the smooth progress of the endoscopic surgery. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of the internal structure of an endoscope according to an embodiment of the present invention;

[0021] Figure 2 yes Figure 1 Schematic diagram of the structure of the transmission mechanism in the endoscope shown.

[0022] The reference numerals are as follows: 100, endoscope; 10, operating member; 11, housing; 20, transmission mechanism; 21, rotating wheel; 211, latching tooth; 22, driven gear; 23, rack; 24, transition gear; 25, guide rail; 251, accommodating chamber; 30, mounting seat; 40, lever; 50, sleeve member. DETAILED DESCRIPTION

[0023] Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations therein are essentially used for illustration purposes rather than for limiting the present invention.

[0024] In order to further illustrate the principle and structure of the present invention, preferred embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0025] For the purpose of subsequent description, unless otherwise specified, no matter how the endoscope is placed, when the endoscope of the present application is in use, the end close to the medical staff is the proximal end, and the end away from the medical staff is the distal end.

[0026] See also Figure 1 and Figure 2 An embodiment of the present application provides an endoscope 100, which can be used to observe the pathological conditions of organs in the human body and can be used with relevant surgical instruments, such as biopsy forceps, to remove the diseased tissue in the patient's body. The endoscope 100 can be used for internal inspection of the duodenum and used as a duodenoscope.

[0027] The endoscope 100 of this embodiment includes an operating member 10 and an inserting member (not shown), the inserting member is connected and fixed to the operating member 10, and the operating member 10 includes a housing 11 and a control unit (not shown) disposed on the housing 11. In this embodiment, the inserting member includes a connecting portion, a bending portion, and a head end portion. The connecting portion is fixed to the operating member 10, the bending portion is connected to the connecting portion, and the head end portion is disposed at one end of the bending portion away from the connecting portion.

[0028] The head end includes a camera (not shown) for collecting images of organs or tissues in the patient's body so that medical staff can understand the pathological conditions in the patient's body. The curved portion is in the shape of an elongated tube, which can be made of a flexible material to bend appropriately. During the actual use of the endoscope 100, the insert enters the human body. The medical staff can manipulate the control part of the operating part 10 to make the curved portion of the insert conform to the curvature of the human body channel and make the head end close to the lesion site, so that the camera can obtain images of the lesions inside the human body, so as to effectively cooperate with the surgical instrument to remove the lesion tissue.

[0029] In this embodiment, the endoscope 100 further includes a forceps lifter (not shown) and a drawstring (not shown). The head end of this embodiment is provided with an installation space and a drawstring channel connected to the installation space, and the drawstring channel is connected to the interior of the curved portion. The forceps lifter is rotatably arranged in the installation space, and the forceps lifter is used to carry surgical instruments. The drawstring is a steel wire rope with a certain hardness, and the drawstring is passed through the drawstring channel to be fixed to the forceps lifter.

[0030] Furthermore, if Figure 2 As shown, the endoscope 100 of this embodiment further includes a transmission mechanism 20, which is disposed inside the housing 11 of the operating member 10, and is used to drive the forceps lifter to lift and return. It is understandable that in the endoscope 100, in addition to driving the forceps lifter, the transmission mechanism 20 can also drive other components accordingly, such as adjusting the bending angle of the bending portion.

[0031] Specifically, the transmission mechanism 20 includes a rotating wheel 21, a driven gear 22, and a rack 23. The rotating wheel 21 is rotatably disposed in the housing 11 of the operating member 10, and the rotating wheel 21 can rotate around its own center, and a latching tooth 211 is provided on the outer edge thereof. The driven gear 22 is meshed with the latching tooth 211 on the outer edge of the rotating wheel 21 to follow the rotating wheel 21. The rack 23 is fixed to the forceps lifting device through a pull rope, and the rack 23 is meshed with the driven gear 22 to follow the driven gear 22, thereby driving the forceps lifting device to lift and return.

[0032] In this embodiment, the endoscope 100 further includes a mounting seat 30, which is fixed in the housing 11 of the operating member 10 for assembling the transmission mechanism 20. The rotating wheel 21 is rotatably disposed on the mounting seat 30 to be arranged in the housing 11 of the operating member 10, and the rotating wheel 21 can rotate along its own center. The endoscope 100 of this embodiment further includes a lever 40, one end of which is fixed to the rotating wheel 21, and the other end of which extends outward from the housing 11 of the operating member 10.

[0033] The part of the lever 40 extending outward from the housing 11 is used to contact the fingers of the medical staff. The contact end of the lever 40 is provided with concave and convex patterns to increase the friction between the end of the lever 40 and the fingers, so as to facilitate the medical staff to control the lever 40. When the lever 40 is moved, the rotating wheel 21 rotates around its own center to drive the driven gear 22 to rotate, so that the rack 23 moves linearly to drive the forceps lifter to lift and return.

[0034] The outer edge of the rotating wheel 21 of this embodiment is provided with a latching tooth 211, and the latching tooth 211 is used to mesh with the driven gear 22. In this embodiment, the rotating wheel 21 is circular, and the latching tooth 211 is provided in the arc-shaped area of ​​the outer circumference of the rotating wheel 21. The rotation angle of the rotating wheel 21 and the arc length occupied by the latching tooth 211 are related to the stroke of the linear motion of the rack 23, as long as the forceps lifting device can be controlled to be effectively lifted and returned.

[0035] Furthermore, the driven gear 22 of this embodiment is rotatably disposed on the mounting seat 30, and the driven gear 22 is meshed with the latching teeth 211 on the outer edge of the rotating wheel 21, so as to realize the driving of the driven gear 22 by the rotating wheel 21. Under the drive of the rotating wheel 21, the driven gear 22 can rotate around its own center. The driven gear 22 can be directly meshed with the latching teeth 211 on the outer edge of the rotating wheel 21, or can be indirectly meshed with the latching teeth 211 on the outer edge of the rotating wheel 21 through the transition of related components.

[0036] The driven gear 22 is directly meshed with the latching teeth 211 on the outer edge of the rotating wheel 21. The driven gear 22 is arranged on the side of the rotating wheel 21 where the latching teeth 211 are provided. The outer peripheral side teeth of the driven gear 22 are directly meshed with the latching teeth 211 to achieve the driven gear 22 following the rotation of the rotating wheel 21.

[0037] Specifically, in the viewing direction of the accompanying drawings of the specification, when the lever 40 is pushed toward the proximal end to rotate the rotating wheel 21 clockwise, the driven gear 22 directly meshing with the rotating wheel 21 rotates counterclockwise relative to each other, so that the rack 23 moves linearly toward the proximal end of the endoscope 100, so as to pull the pull rope to lift the forceps lifter; when the lever 40 is pushed toward the distal end to rotate the rotating wheel 21 counterclockwise, the driven gear 22 directly meshing with the rotating wheel 21 rotates clockwise relative to each other, so that the rack 23 moves linearly toward the distal end of the endoscope 100, so as to push the pull rope to return the forceps lifter to its position.

[0038] By directly meshing the rotating wheel 21 with the driven gear 22, the driven gear 22 can quickly follow the rotation of the rotating wheel 21, so that medical staff can effectively adjust the angle of the forceps lifter according to the diseased tissue, so that the surgical instruments on the forceps lifter can clamp the diseased tissue in a targeted manner, ensuring the smooth progress of the endoscopic surgery 100.

[0039] In this embodiment, the transmission mechanism 20 further includes a transition gear 24 , through which the driven gear 22 is meshed with the latching teeth 211 of the rotating wheel 21 , and the transition gear 24 is rotatably disposed on the mounting seat 30 .

[0040] Specifically, the transition gear 24 is arranged between the rotating wheel 21 and the driven gear 22, and the transition gear 24 is meshed with the latching teeth 211 of the rotating wheel 21 and the driven gear 22 respectively. When the rotating wheel 21 rotates around its own center, the rotating wheel 21 can drive the transition gear 24 meshed therewith to rotate. Driven by the rotating wheel 21, the transition gear 24 can rotate around its own center. The transition gear 24 drives the driven gear 22 to rotate, so that the driven gear 22 follows the rotation of the rotating wheel 21. The rotating driven gear 22 drives the rack 23 to make a linear motion, so that the pull rope drives the lifting device to lift and return.

[0041] For the transmission mechanism 20 of the present embodiment, in the viewing direction of the accompanying drawings of the specification, when the lever 40 is pushed toward the distal end to cause the rotating wheel 21 to rotate counterclockwise, the rotating wheel 21 drives the transition gear 24 directly meshing with it to rotate clockwise relatively, so that the transition gear 24 drives the driven gear 22 to rotate counterclockwise, so that the rack 23 moves linearly toward the proximal end of the endoscope 100, so as to pull the pull rope to lift the forceps lifter.

[0042] When the lever 40 is pushed toward the proximal end to rotate the rotating wheel 21 clockwise, the rotating wheel 21 drives the transition gear 24 directly meshing with it to rotate counterclockwise relative to it, so that the transition gear 24 drives the driven gear 22 to rotate clockwise, so that the rack 23 moves toward the distal end of the endoscope 100, so as to push the pull rope to return the forceps lifter to its position.

[0043] The meshing of the rotating wheel 21 and the driven gear 22 is achieved through the transition gear 24. Compared with the setting of direct meshing of the rotating wheel 21 and the driven gear 22, the moving direction of the lever 40 can be changed under the action of the transition gear 24, so that the lever 40 can be pushed toward the distal end to lift the forceps lifter, and the lever 40 can be pushed toward the proximal end to return the forceps lifter, so that the moving method of the lever 40 is more suitable for the routine operation of medical staff.

[0044] Therefore, for the endoscope 100 of this embodiment, when using it, medical staff do not need to change the commonly used way of moving the lever 40. They can continue to operate the endoscope 100 of this embodiment according to the habit of operating the forceps lifter of the existing endoscope 100. This makes the endoscope 100 more compliant with the operation of medical staff on the basis of the change of the internal transmission mechanism 20, which is conducive to the smooth progress of the endoscopic surgery 100.

[0045] In this embodiment, the outer diameter of the transition gear 24 is smaller than the outer diameter of the driven gear 22. When the rotating wheel 21 rotates to drive the transition gear 24 to rotate, the transition gear 24 can drive the driven gear 22 to rotate, and the driven gear 22 and the transition gear 24 rotate at the same angle. The arc length of the rotation of the driven gear 22 with a larger outer diameter is greater than the arc length of the rotation of the transition gear 24, so that the driven gear 22 drives the rack 23 to move a longer distance, thereby achieving effective control of the pulling distance of the forceps lifter and improving the flexibility of the forceps lifter.

[0046] It is understandable that during the specific use of the endoscope 100, the outer diameters of the transition gear 24 and the driven gear 22 can be set to be equal, or the outer diameter of the transition gear 24 can be set to be smaller than the outer diameter of the driven gear 22 according to the actual stroke size of the forceps lifter.

[0047] Furthermore, the rack 23 of this embodiment, driven by the driven gear 22, converts the circular motion of the rotating wheel 21 around itself into linear motion, so as to realize the control of the lifting and returning of the forceps lifter by the pull rope.

[0048] In this embodiment, the transmission mechanism 20 further includes a guide rail 25 , which is fixed inside the housing 11 of the operating member 10 . The extending direction of the guide rail 25 is consistent with the moving direction of the rack 23 .

[0049] The guide rail 25 of this embodiment has an accommodating cavity 251 inside, and the rack 23 is movably arranged in the accommodating cavity 251. The setting of the guide rail 25 can control the rack 23 to move in a straight line, so that the rack 23 can control the forceps lifter through the pull rope in a straight line direction, so as to avoid the angle deviation of the forceps lifter during the working process, and ensure that the surgical instruments on the forceps lifter can accurately clamp the diseased tissue in the patient's body.

[0050] The guide track 25 is arranged on one side of the transition gear 24 and the driven gear 22, and an opening is arranged on the side wall of the guide track 25 close to the driven gear 22. The toothed portion of the rack 23 can pass through the opening on the side wall of the guide track 25 and mesh with the driven gear 22, so that the rack 23 follows the driven gear 22.

[0051] The rack 23 moves linearly under the action of the guide rail 25, and the tension fixed to the rack 23 can pull or push the forceps lifter linearly to lift and return the forceps lifter, thereby rotating the surgical instrument on the forceps lifter to effectively locate and remove the lesion.

[0052] In addition, the endoscope 100 of this embodiment further includes a sleeve member 50. The sleeve member 50 is fixed inside the housing 11 of the operating member 10, and the pull rope is passed through the sleeve member 50. In this embodiment, the sleeve member 50 can be a spring sleeve or a stainless steel capillary.

[0053] The spring sleeve is highly practical and can provide a moving channel for the pull rope, preventing the pull rope from arching or bending during linear movement, and avoiding the pull rope from deviating from its angle when driving the forceps lifter, thereby ensuring that the surgical instrument is accurately positioned at the lesion site and ensuring that the endoscope 100 and the surgical instrument cooperate efficiently.

[0054] The stainless steel capillary has the same function as the spring sleeve, that is, it can provide a moving channel for the pull rope to ensure the movement path of the pull rope. At the same time, the stainless steel capillary has good flexibility and tensile strength, and can be freely bent into various angles and curvature radii. It has the same flexibility and durability in all directions, thereby effectively ensuring that the end of the endoscope 100 can be accurately positioned at the lesion site in the patient's body, ensuring that the endoscopic surgery 100 is carried out efficiently.

[0055] In this embodiment, the rotating wheel 21, the transition gear 24, the driven gear 22 and the rack 23 are all plastic parts. Compared with hardware parts, plastic parts are more flexible and less expensive. While ensuring the driving function of the transmission mechanism 20, the endoscope 100 can be made into a disposable product. The endoscope 100 is immediately discarded as a whole after one use, and no longer needs to be repeatedly cleaned and used, which effectively prevents cross infection between patients.

[0056] For the existing endoscope mentioned in the background art, if it is to be made into a disposable product, the connecting rod and the straight rod need to be injection molded into plastic parts under the premise of controlling costs. However, in order to ensure the stability of the structure, the rotating shaft at the hinge position of the straight rod and the connecting rod still needs to be a hardware part.

[0057] The existing connecting rod mechanism requires the cooperation of plastic parts and hardware parts when driving the lifting clamp, which can easily cause the straight rod and the connecting rod to be riveted together, causing the connecting rod mechanism to be stuck, resulting in the connecting rod being unable to rotate flexibly, or even worse, causing the connecting rod to break.

[0058] Therefore, if the existing endoscope is to be made into a disposable product, the metal connecting rod is directly replaced with a plastic part without changing the connecting rod structure. The connecting rod mechanism is easy to get stuck or even deformed and broken during the movement process, thus affecting the smooth progress of the endoscopic surgery. To avoid the connecting rod from getting stuck or breaking, the size of the connecting rod itself needs to be increased to achieve strength enhancement. However, the internal space size of the endoscope is limited, and a large-sized connecting rod requires a larger range of rotation space, which is easy to interfere with and collide with other internal structures, affecting the stability of the overall structure of the existing endoscope.

[0059] It can be seen that if the connecting rod mechanism of the existing endoscope is flexible, it cannot meet the requirements of injection molding of various components of disposable products to form plastic parts. Under the premise of ensuring cost, the endoscope 100 cannot be used and must be discarded in time. However, if it is not cleaned completely, it is easy to cause cross infection of patients.

[0060] When the endoscope 100 of this embodiment is in use, the medical staff can rotate the rotating wheel 21 by toggling the lever 40, and the rotating rotating wheel 21 drives the meshing transition gear 24, and the transition gear 24 drives the driven gear 22 to rotate, so that the driven gear 22 follows the rotating wheel 21. The rotating driven gear 22 can drive the rack 23 to make a linear motion, so that the rack 23 drives the pull rope, and the pull rope pulls the forceps lifter to achieve the lifting and returning of the forceps lifter.

[0061] For the endoscope and its transmission mechanism of this embodiment, the driven gear meshes with the teeth on the outer edge of the rotating wheel, so that the driven gear follows the rotation of the rotating wheel, and the rotating driven gear drives the meshing rack to make linear motion, so that the rack drives the forceps lifter, thereby realizing the lifting and returning of the forceps lifter. During the driving process of the transmission mechanism, the rotating wheel and the driven gear both rotate around their own centers. In the limited space of the endoscope, the driven gear will not occupy a large rotation space to avoid interference between the transmission mechanism and other components. At the same time, the driven gear effectively cooperates with the rotating wheel and the rack, and can also effectively avoid the occurrence of stuck components during the driving process, ensuring the flexibility of the transmission mechanism to drive the forceps lifter and ensuring the smooth progress of endoscopic surgery.

[0062] Although the present invention has been described with reference to several typical embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the present invention can be embodied in a variety of forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims, so all changes and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A transmission mechanism of an endoscope, which can be used to drive the lifting and returning of the forceps lifting device of the endoscope, characterized in that: The transmission mechanism comprises: A rotating wheel is arranged inside the housing of the endoscope, the rotating wheel can rotate around its own center, and a latching tooth is arranged on the outer edge of the rotating wheel; A driven gear meshes with the teeth on the outer edge of the rotating wheel to follow the rotating wheel; The rack can be used to connect with the forceps lifter of the endoscope; the rack is meshed with the driven gear to follow the driven gear, thereby driving the forceps lifter to lift and return.

2. The transmission mechanism according to claim 1, characterized in that: The transmission mechanism also includes a transition gear, through which the driven gear is meshed with the latching teeth of the rotating wheel; the transition gear is respectively meshed with the latching teeth of the rotating wheel and the driven gear to drive the driven gear to rotate when the rotating wheel rotates.

3. The transmission mechanism according to claim 2, characterized in that: The outer diameter of the driven gear is greater than the outer diameter of the transition gear.

4. The transmission mechanism according to claim 1, characterized in that: The transmission mechanism also includes a guide rail, which is fixed inside the shell of the endoscope; the extension direction of the guide rail is consistent with the moving direction of the rack; a receiving cavity is provided inside the guide rail, and the rack is movably arranged in the receiving cavity, and an opening is provided on one side of the guide rail for the toothed portion of the rack to pass through and engage with the driven gear.

5. The transmission mechanism according to claim 1, characterized in that: The rotating wheel, the driven gear and the rack are all plastic parts.

6. An endoscope, comprising an operating member and an inserting member connected to the operating member, characterized in that: The endoscope also includes the transmission mechanism described in any one of claims 1-5, which is arranged inside the shell of the operating part; the endoscope also includes a forceps lifter, which is arranged in the inserter, and the rack of the transmission mechanism is connected to the forceps lifter to drive the forceps lifter to lift and return.

7. The endoscope according to claim 6, characterized in that The endoscope further comprises a pull rope, and the rack is fixed to the forceps elevator via the pull rope.

8. The endoscope according to claim 7, characterized in that: The endoscope further comprises a sleeve member, the interior of which is hollow; the sleeve member is fixed inside the housing of the operating member, and the pull rope is passed through the sleeve member.

9. The endoscope according to claim 8, characterized in that The sleeve piece is a spring sleeve or a stainless steel capillary.

10. The endoscope according to claim 6, characterized in that The endoscope further comprises a lever, which is fixed to the rotating wheel of the transmission mechanism to control the rotation of the rotating wheel.

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