Front end assembly, guide sheath and implantation device

Abstract

The invention discloses a front end assembly, a guide sheath and an implantation device, and belongs to the technical field of medical instruments. The front-end assembly is applied to the guiding sheath and comprises a sheath tube, a movable part and a driving structure. The sheathing canal is provided with a containing cavity channel, the far end face of the sheathing canal is provided with a containing cavity, and the containing cavity channel is sleeved with the containing cavity; the movable part is an annular structural part, the movable part is movably installed in the containing cavity, at least part of the movable part stretches out of the containing cavity under the condition that the movable part is in the stretching-out state, and the movable part is contained in the containing cavity under the condition that the movable part is in the retracting state; the driving structure is connected with the movable part and used for driving the movable part to move relative to the containing cavity so that the movable part can be switched between the stretching state and the retracting state, and under the condition that the movable part is in the stretching state, the driving structure is further used for controlling deformation of the movable part to adjust the size of the far-end opening of the movable part. The movable part is movably arranged in the accommodating cavity, so that the influence on the placement of the guide sheath is avoided, and meanwhile, stones can be prevented from scattering all around.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a front-end assembly, a guide sheath and an implantation device. BACKGROUND

[0002] As an important device in modern medicine, an endoscope is widely used in various surgeries and diagnoses. The endoscope generally consists of a handle and an insertion part. During use, the endoscope is inserted into the body through a natural cavity or a surgical incision of the human body by the insertion part, and image information in the body is obtained by a camera module at the end of the insertion part.

[0003] When the existing medical device is used to treat a calculus, a ureteral sheath and an endoscope are implanted, the insertion part of the endoscope is arranged in the ureteral sheath, and the instrument channel of the endoscope can be used for functions such as laser lithotripsy, cooling and flushing, and calculus extraction. In order to avoid the scattering of the fragments in the human body during the laser lithotripsy, a protective structure is usually arranged at the distal end of the ureteral sheath, and the calculus is captured in the protective structure before the lithotripsy, so as to avoid the scattering of the fragments.

[0004] Reference can be made to the US patent document with the publication number US20250134591A1. In this patent, a tubular member is arranged at the distal end of the sheath tube, and the treatment of the calculus is performed in the tubular member. However, since the tubular member is arranged at the distal end of the sheath tube, it will affect the implantation of the sheath tube and the shooting field of view of the camera at the distal end of the endoscope, and will also affect the bending action of the distal end of the endoscope. SUMMARY

[0005] The purpose of the present application is to provide a front-end assembly, a guide sheath and an implantation device, which solve the above technical problems in the prior art.

[0006] The present application is implemented as follows: In a first aspect, the present application provides a front-end assembly applied to a guide sheath, comprising a sheath tube, a movable member and a driving structure. The sheath tube has a receiving cavity through which an insertion part of an endoscope passes, and a containing cavity is arranged at the distal end of the sheath tube. The movable member is an annular structure, and is movably installed in the containing cavity. The movable member has an extended state and a retracted state. In the extended state, at least part of the movable member extends out of the containing cavity, and in the retracted state, the movable member is accommodated in the containing cavity. The driving structure is connected with the movable member, and is used to drive the movable member to move relative to the containing cavity, so as to switch the movable member between the extended state and the retracted state. In the extended state, the driving structure is also used to control the deformation of the movable member, so as to adjust the size of the distal end opening of the movable member.

[0007] In a second aspect, the present application provides a guide sheath comprising the front-end assembly provided in the first aspect.

[0008] In a third aspect, the embodiments of the present application provide a placement device, comprising an endoscope and the guide sheath provided in the second aspect, and the insertion part of the endoscope is arranged in the accommodation channel.

[0009] The technical scheme provided by the present application can achieve the following beneficial effects: In the present application, the movable member can be moved into or out of the accommodation cavity under the control of the driving structure, so that the movable member is switched between the extended state and the retracted state; in the case of placing the sheath tube into the cavity, the movable member is controlled to move into the accommodation cavity, and the movable member is switched to the retracted state, so as to avoid the movable member affecting the placement of the sheath tube, and also avoid the movable member affecting the shooting field of view of the endoscope in the sheath tube; in the case of needing to process the calculus, the movable member is controlled to move out of the accommodation cavity, and the movable member is switched to the extended state, so as to form a processing space for the calculus by using the movable member, thereby avoiding the scattering of the calculus during the lithotripsy. In addition, in the case that the movable member is in the extended state, the driving structure can also control the size of the distal end opening of the movable member, so as to expand the distal end opening of the movable member, and more easily grasp the calculus in the movable member, and by reducing the size of the distal end opening of the movable member, the probability of the scattered calculus in the movable member during the lithotripsy can be further reduced. BRIEF DESCRIPTION OF DRAWINGS

[0010] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0011] Figure 1 is the overall structure diagram of the front-end assembly provided by some embodiments of the present application Figure 1 ; Figure 2 is the split diagram of the front-end assembly provided by some embodiments of the present application; Figure 3 is the detail view of A in the present application Figure 2 ; Figure 4 is the cooperation diagram of the movable member and the driving structure provided by some embodiments of the present application Figure 1 ; Figure 5 is the split diagram of the movable member and the driving structure provided by some embodiments of the present application; Figure 6 is the cooperation diagram of the movable member and the driving structure provided by some embodiments of the present application Figure 2 ; Figure 7is a schematic diagram of the overall structure of a front-end assembly provided by some embodiments of the present application Figure 2 ; Figure 8 is a schematic diagram of the overall structure of a front-end assembly provided by some embodiments of the present application Figure 3 ; Figure 9 is a schematic diagram of the overall structure of a front-end assembly provided by some embodiments of the present application Figure 4 ; Figure 10 is a schematic diagram of the structure of a guide sheath provided by some embodiments of the present application Figure 1 ; Figure 11 is a schematic diagram of the structure of a guide sheath provided by some embodiments of the present application Figure 2 ; Figure 12 is a schematic diagram of the structure of a guide sheath provided by some embodiments of the present application

[0012] In the figure: 100 - sheath tube, 110 - accommodation channel, 120 - accommodation cavity, 200 - movable part, 210 - spring unit, 220 - fixing ring, 300 - driving structure, 310 - first traction rope, 320 - return spring, 330 - second traction rope, 340 - traction ring, 350 - third traction rope, 10 - guide sheath, 20 - endoscope, 21 - insertion part. DETAILED DESCRIPTION

[0013] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described in detail below. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0014] In the specification and claims, "and / or" means at least one of the connected objects, and the character " / " generally means that the front and rear associated objects are in an "or" relationship.

[0015] In the embodiments of the present application, "proximal end" and "distal end" refer to the relative positions of the endoscope 20 and its accessories in the use environment relative to the user, wherein 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".

[0016] The embodiments of the present application provide a front-end assembly applied to a guide sheath 10. For reference Figure 1 and Figure 2As shown, the front end assembly includes a sheath tube 100, which has a receiving cavity 110 for the insertion portion 21 of the endoscope 20 to pass through. The sheath tube 100 is a part of the guide sheath 10, corresponding to the distal end of the insertion portion 21. During the treatment of the calculus, the insertion portion 21 is arranged in the receiving cavity 110 of the sheath tube 100, and the sheath tube 100 and the insertion portion 21 are inserted into the renal pelvis as a whole. The optical fiber extends out of the instrument channel of the insertion portion 21 to perform laser lithotripsy on the calculus, and the gap between the sheath tube 100 and the insertion portion 21 is used to suck and discharge the fragments of the calculus out of the body.

[0017] The distal end face of the sheath tube 100 is also provided with a containing cavity 120, which can be referred to Figure 2 and Figure 3 As shown, the containing cavity 120 is sleeved outside the receiving channel. The front end assembly further includes a movable member 200 and a driving structure 300. The movable member 200 is a ring-shaped structural member, which is movably installed in the containing cavity 120. The movable member 200 has an extended state and a retracted state. In the extended state, at least part of the movable member 200 extends out of the containing cavity 120. In the retracted state, the movable member 200 is accommodated in the containing cavity 120. The driving structure 300 is connected with the movable member 200, and is used to drive the movable member 200 to move relative to the containing cavity 120, so as to switch the movable member 200 between the extended state and the retracted state. In the extended state, the driving structure 300 is also used to control the movable member 200 to deform, so as to adjust the size of the distal end opening of the movable member 200.

[0018] The movable member 200 is installed in the containing cavity 120. Under the driving of the driving structure 300, the movable member 200 can move into the containing cavity 120 and switch to the retracted state, so as to avoid affecting the placement of the sheath tube 100 due to the existence of the movable member 200, reduce the difficulty of placing the sheath tube 100 compared with the prior art, and also avoid affecting the shooting field of view of the endoscope 20 in the sheath tube 100. The movable member 200 can also move out of the containing cavity 120 and switch to the extended state, so as to enclose a treatment space for the calculus. The movable member 200 surrounds the calculus to be treated and protects the calculus, so as to avoid the scattering of the calculus during the lithotripsy process, limit the fragments of the calculus within a certain range, and facilitate the suction of the fragments of the calculus out of the body.

[0019] In the extended state of the movable member 200, the distal end opening of the movable member 200 can also be adjusted by the driving structure 300. Generally, the size of the distal end opening of the movable member 200 is adjusted only when the movable member 200 is located outside the accommodation cavity 120, which can be that part of the movable member 200 is located outside the accommodation cavity 120, or the whole movable member 200 is located outside the accommodation cavity 120. When the movable member 200 is located in the accommodation cavity 120, the inner wall of the accommodation cavity 120 prevents the size of the distal end opening of the movable member 200 from changing.

[0020] As shown in Figure 9 , in the case of expansion of the distal end opening of the movable member 200, the operator is easier to grasp the calculus into the movable member 200, reducing the difficulty of grasping the calculus. In the case of contraction of the distal end opening of the movable member 200, as shown in Figure 7 and Figure 8 , the calculus can be processed inside the movable member 200. Since the size of the distal end opening of the movable member 200 is reduced, the size of the opening that connects the inside of the movable member 200 with the surrounding environment is also reduced, and the gravel is less likely to scatter from the movable member 200 to the outside of the movable member 200, further reducing the probability of gravel remaining in the renal pelvis.

[0021] Compared with the existing products, since the movable member 200 of the present application can move relative to the accommodation cavity 120 and switch to the retracted state, the movable member 200 will not affect the process of inserting the sheath 100 into the human body, and at the same time, it will not affect the image information obtained by the distal end camera module of the insertion part 21. Moreover, the movable member 200 can also switch to the extended state to assist in grasping the calculus, reduce the difficulty of grasping the calculus, and form a space for processing the calculus inside the movable member 200. In cooperation with the driving structure 300 to control the size of the distal end opening of the movable member 200, it can further avoid the gravel from scattering in the renal pelvis.

[0022] The driving structure 300 can be an electrically controlled structure or a manually controlled structure. In some embodiments of the present application, as shown in Figure 2 , Figures 4 to 6 , the driving structure 300 includes a first traction rope 310 and a return spring 320. The return spring 320 is installed in the accommodation cavity 120 and located between the bottom of the accommodation cavity 120 and the movable member 200. One end of the first traction rope 310 is fixed to the movable member 200, and the other end extends towards the proximal end of the guide sheath 10.

[0023] The operator can move the movable member 200 by controlling the first traction rope 310 to pull the movable member 200 to drive the movable member 200 into the accommodating cavity 120. When the movable member 200 moves into the accommodating cavity 120, the movable member 200 will press the reset spring 320, and the operator can make the movable member 200 move out of the accommodating cavity 120 under the elastic driving of the reset spring 320 by reducing the force on the first traction rope 310. The first traction rope 310 cooperates with the reset spring 320 to quickly and conveniently control the position of the movable member 200.

[0024] In some preferred embodiments of the present application, referring to Figures 4 to 9 The movable member 200 includes a plurality of elastic sheet units 210, all of which are distributed along the circumference of the movable member 200, and the proximal ends of all of the elastic sheet units 210 are fixedly connected to form a whole, and the first traction rope 310 is fixed to the proximal end of the movable member 200 to facilitate the control of the overall position of the movable member 200 by the first traction rope 310.

[0025] The distal ends of all of the elastic sheet units 210 are pre-bent towards the direction of approaching or moving away from the axis of the movable member 200, and the driving structure 300 further includes a second traction rope 330, one end of which is fixed to the distal end of the elastic sheet unit 210, and the other end extends towards the proximal end of the guide sheath 10 for the operator to control. The second traction rope 330 is configured to move along the axis of the movable member 200 to drive the distal end of the elastic sheet unit 210 to move and deform, thereby adjusting the size of the distal end opening of the movable member 200.

[0026] The elastic sheet unit 210 is pre-bent, and the pre-bending direction can be inward bending or outward bending. For example, the plurality of elastic sheet units 210 are pre-bent towards the direction of approaching the axis of the movable member 200, i.e. the plurality of elastic sheet units 210 are inward bent, and the shape of the pre-bent elastic sheet unit 210 can be referred to Figure 7 and Figure 8 By pulling the second traction rope 330, the elastic sheet unit 210 can be driven to open outward, thereby expanding the size of the distal end opening of the movable member 200, and the shape of the expanded movable member 200 can be referred to Figure 9 When it is necessary to expand the size of the opening of the movable member 200, the second traction rope 330 is pulled towards the proximal end, so that the plurality of elastic sheet units 210 bend outward, and the shape of the movable member 200 gradually changes in the order of Figures 7 to 9 When it is necessary to reduce the size of the opening of the movable member 200, the operator releases the control of the second traction rope 330, the pulling action of the second traction rope 330 on the elastic sheet unit 210 disappears, the elastic sheet unit 210 gradually recovers to the pre-bent state, and the shape of the movable member 200 gradually changes in the order of Figure 9 , Figures 8 to 7The order gradually changes.

[0027] For example, the plurality of spring sheet units 210 are arranged in a pre-bent manner away from the axis of the movable member 200, i.e. the plurality of spring sheet units 210 are bent outwardly. The shape of the pre-bent spring sheet units 210 can be referred to as shown in Figure 9 By pulling the second traction rope 330, the spring sheet units 210 can be bent inwardly, so that the plurality of spring sheet units 210 are gathered together, thereby reducing the size of the distal opening of the movable member 200. The shape of the gathered movable member 200 can be referred to as shown in Figure 7 and Figure 8 By releasing the control of the second traction rope 330, the pulling effect of the second traction rope 330 on the spring sheet units 210 disappears, and the spring sheet units 210 gradually recover to the pre-bent state, i.e. the spring sheet units 210 are bent outwardly, and the size of the distal opening of the movable member 200 expands.

[0028] The first traction rope 310 is mainly used for adjusting and controlling the position of the movable member 200 in the accommodation cavity 120, and the second traction rope 330 is mainly used for adjusting the size of the distal opening of the movable member 200. The two traction ropes can be used flexibly to use the movable member 200.

[0029] For example, when the size of the distal opening of the movable member 200 is reduced, the first traction rope 310 can be used to drive the movable member 200 to move as a whole, so as to drive the stones trapped in the movable member 200 to move. Alternatively, the size of the distal opening of the movable member 200 can be controlled to expand, and the movable member 200 can be driven to move out of the accommodation cavity 120 to trap the stones. Compared with adjusting the positions of the sheath tube 100 and the insertion portion 21 to trap the stones, directly adjusting the position of the movable member 200 is more convenient, and causes less discomfort to the human body.

[0030] In some preferred embodiments, the driving structure 300 further includes a traction ring 340 and a third traction rope 350, as shown in Figure 5 and Figure 6 The traction ring 340 is located in the accommodation cavity 120 and at the proximal end of the movable member 200. The proximal ends of the second traction ropes 330 fixed to all the spring sheet units 210 are fixed to the traction ring 340. The distal end of the third traction rope 350 is fixed to the proximal end of the traction ring 340, and the proximal end extends towards the proximal end of the guide sheath 10.

[0031] By driving the movement of the third traction rope 350, the movement of the traction ring 340 can be controlled, thereby controlling the movement of all the second traction ropes 330 fixed to the traction ring 340 to pull the second traction ropes 330, adjust the bending state of the elastic unit, and thereby adjust the size of the distal end opening of the movable piece 200. By cooperating the traction ring 340 and the third traction rope 350, the control of the plurality of elastic sheet units 210 is integrated, on the one hand, the control difficulty of the plurality of elastic sheet units 210 can be reduced, and the case that a plurality of second traction ropes 330 directly extend from the distal end to the proximal end of the insertion part 21 at the same time and excessively occupy the internal space of the insertion part 21 can be avoided. On the other hand, the plurality of elastic sheet units 210 can also be deformed synchronously, and the control accuracy of the size of the distal end opening of the movable piece 200 can be improved.

[0032] In some specific embodiments, the proximal end of the elastic sheet unit 210 is pre-bent towards the direction close to the axis of the movable piece 200, and the second traction rope 330 is arranged close to the outer side wall of the elastic sheet unit 210 in the thickness direction of the elastic sheet unit 210. When the elastic sheet unit 210 is pulled by the second traction rope 330, the stress point of the elastic sheet unit 210 is located on the outer side, and the elastic sheet unit 210 is more easily bent outward after being stressed, which is more convenient for the operator to control the shape of the movable piece 200. It can be understood that the outer side wall close to the elastic sheet unit 210 mentioned in the embodiments of the present application is relative to the inner side wall of the elastic sheet unit 210.

[0033] The connection between the second traction rope 330 and the elastic sheet unit 210 can be that the distal end of the second traction rope 330 is fixed to the outer side wall of the elastic sheet unit 210, and the second traction rope 330 extends towards the proximal end along the outer side wall of the elastic sheet unit 210. There can also be a groove arranged on the outer side wall of the elastic sheet unit 210, and the groove is used to limit the movement path of the second traction rope 330. In other embodiments, a through hole can be arranged in the elastic sheet unit 210, the second traction rope 330 is arranged in the through hole, and the distal end of the through hole is arranged close to the outer side wall of the elastic sheet unit 210.

[0034] The cooperation of the second traction rope 330, the traction ring 340 and the third traction rope 350 can adjust the size of the distal end opening of the movable piece 200 without adjusting the position of the movable piece 200 relative to the accommodating cavity 120. In the movement of the second traction rope 330, the traction ring 340 and the third traction rope 350, the reset spring 320 and the first traction rope 310 remain stable to avoid mutual interference.

[0035] In some embodiments, the second traction rope 330, the traction ring 340 and the third traction rope 350 are located inside the reset spring 320, and the movement of the reset spring 320 does not affect the positions of the first three. In other embodiments, the traction ring 340 is sleeved outside the reset spring 320, and the second traction rope 330 and the third traction rope 350 connected with the traction ring 340 are also located outside the reset spring 320. The reset spring 320 separates the first traction rope 310 and the second traction rope 330, avoiding the mutual entanglement between the first traction rope 310 and the second traction rope 330, and facilitating the normal use of the whole front end assembly.

[0036] In some embodiments of the present application, the first traction rope 310 and the second traction rope 330 are each provided with two symmetrically distributed ropes, so that the traction ring 340 and the movable piece 200 are uniformly stressed.

[0037] As shown in Figures 4 to 6 In some embodiments, the width of the elastic sheet unit 210 gradually decreases in the direction from the proximal end to the distal end of the movable piece 200, which is conducive to the gathering and closing of the distal ends of the plurality of elastic sheet units 210.

[0038] In other embodiments, the driving structure 300 further comprises a fixed ring 220, the fixed ring 220 is located at the proximal end of the elastic sheet unit 210, and the proximal ends of all the elastic sheet units 210 are fixed to the fixed ring 220, and the proximal end of the first traction rope 310 is fixed to the fixed ring 220. All the elastic sheet structures are fixed together by using the fixed ring 220, and the first traction rope 310 is directly connected to the fixed ring 220, and the position of the movable piece 200 is controlled by driving the movement of the fixed ring 220, which is more convenient to operate.

[0039] In some preferred embodiments, the movable piece 200 is a structural member made of transparent material, such as a plastic structural member. The movable piece 200 is a transparent structure, which reduces the influence of the reduced size of the distal end of the movable piece 200 on the field of view of the camera module when the movable piece 200 is used to cover and treat the calculus.

[0040] The embodiments of the present application provide a guide sheath 10, which can refer to Figure 10 and Figure 11 The guide sheath 10 further comprises a sheath body, and the sheath tube 100 is connected to the sheath body, and the accommodation cavity 120 is located at the distal end of the sheath tube 100 away from the sheath body. Figure 10 In the case shown in Figure 11 In the case shown in

[0041] The embodiments of the present application further provide a placement device, which can refer to Figure 12As shown, the insertion part 21 of the endoscope 20 is arranged in the accommodation cavity 110 of the sheath tube 100.

[0042] The endoscope 20 referred to in the embodiments of the present application can be a nephroscopic mirror, or a bronchoscopic mirror, an esophagoscopic mirror, a gastroscope, a colonoscope, an otoscope, a nasoscope, an oral cavity mirror, a laryngoscope, a vaginal mirror, a laparoscope, an arthroscope, etc. The embodiments of the present application do not limit the type of the endoscope 20.

[0043] It should be noted that in this document, the terms "comprising", "including", or any other variant thereof are intended to cover a non-exclusive inclusion, so that a process, method, article, or apparatus that comprises a list of elements does not only include those elements, but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without more limitations, an element defined by the phrase "comprising a" does not exclude the existence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0044] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A front-end component, characterized in that, Applied to the guide sheath (10), the front end component includes: The sheath (100) has a receiving cavity (110) through which the insertion part (21) of the endoscope (20) passes, and the distal end face of the sheath (100) is provided with a receiving cavity (120), which is sleeved outside the receiving cavity (110); The movable component (200) is a ring-shaped structure and is movably installed in the receiving cavity (120). The movable component (200) has an extended state and a retracted state. When the movable component (200) is in the extended state, at least part of the movable component (200) extends out of the receiving cavity (120). When the movable component (200) is in the retracted state, the movable component (200) is housed in the receiving cavity (120). A drive structure (300) is connected to the movable member (200) and is used to drive the movable member (200) to move relative to the receiving cavity (120), so that the movable member (200) switches between an extended state and a retracted state. When the movable member (200) is in the extended state, the drive structure (300) is also used to control the deformation of the movable member (200) to adjust the size of the distal opening of the movable member (200).

2. A front-end component according to claim 1, characterized in that, The drive structure (300) includes a first traction rope (310) and a return spring (320). The return spring (320) is installed in the accommodating cavity (120) and is located between the bottom of the accommodating cavity (120) and the movable member (200). One end of the first traction rope (310) is fixed to the movable member (200), and the other end extends toward the proximal end of the guide sheath (10).

3. A front-end component according to claim 2, characterized in that, The movable component (200) includes a plurality of spring units (210), all of the spring units (210) are distributed circumferentially along the movable component (200), the proximal ends of all the spring units (210) are fixedly connected, and the distal ends of all the spring units (210) are pre-bent in a direction close to or away from the axis of the movable component (200), and the first traction rope (310) is fixed to the proximal end of the movable component (200); The drive structure (300) includes a second traction rope (330), one end of which is fixed to the distal end of the spring unit (210), and the other end extends toward the proximal end of the guide sheath (10). The second traction rope (330) is configured to move axially along the movable member (200) to drive the distal end of the spring unit (210) to move and deform, thereby adjusting the distal opening size of the movable member (200).

4. A front-end component according to claim 3, characterized in that, The drive structure (300) further includes a traction ring (340) and a third traction rope (350). The traction ring (340) is located within the accommodating cavity (120) and at the proximal end of the movable member (200). The proximal ends of the second traction ropes (330) fixed to all the spring units (210) are fixed to the traction ring (340). The distal end of the third traction rope (350) is fixed to the proximal end of the traction ring (340) and extends toward the proximal end of the guide sheath (10).

5. A front-end component according to claim 4, characterized in that, The proximal end of the spring unit (210) is pre-bent toward the axis of the movable member (200), and the second traction rope (330) is disposed near the outer wall of the spring unit (210) in the thickness direction.

6. A front-end component according to claim 5, characterized in that, The traction ring (340) is movably sleeved outside the return spring (320).

7. A front-end component according to claim 3, characterized in that, Along the direction from the proximal end to the distal end of the movable member (200), the width of the spring element (210) gradually decreases; And / or, the drive structure (300) further includes a retaining ring (220) located at the proximal end of the spring unit (210), and the proximal ends of all the spring units (210) are fixed to the retaining ring (220), and the proximal end of the first traction rope (310) is fixed to the retaining ring (220).

8. A front-end component according to claim 1, characterized in that, The movable part (200) is a structural part made of transparent material.

9. A guide sheath, characterized in that, Includes the front-end component as described in any one of claims 1-8.

10. An insertion device, characterized in that, Includes an endoscope (20) and a guide sheath (10) as described in claim 9, wherein the insertion portion (21) of the endoscope (20) passes through the receiving cavity (110).

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