CN117503024A - Bending control structure and endoscope - Google Patents

Abstract

The present invention relates to a bending control structure and an endoscope. The bending control structure includes: a mounting substrate; the bending adjusting mechanism comprises two laminated chain wheels and two laminated chains, wherein the two laminated chain wheels and the two laminated chains are arranged on the mounting substrate; each chain corresponds to one chain wheel, and the chain can rotate along with the corresponding chain wheel; the limiting mechanism is arranged on the side surface of the mounting substrate; the limiting mechanism can limit the tail end of the chain; the limiting mechanism comprises a limiting block and a limiting adjusting component, the limiting block is arranged at the tail end of the chain, and the limiting adjusting component is arranged on the mounting substrate and corresponds to the limiting block; the limiting and adjusting assembly can limit the limiting block, and can move along the length direction of the chain and limit the chain to a required position. The distance between the limiting and adjusting component and the limiting block is adjusted, the maximum displacement of the chain can be increased, and the flexible adjustment of the maximum bending angle of the insertion tube is realized. The limiting mechanism is simple in structure and convenient to install, disassemble and use.

Description

Bending control structure and endoscope

Technical Field

The invention relates to the technical field of medical instruments, in particular to a bending control structure and an endoscope.

Background

With the increasing level of medical treatment, endoscopes have been widely used in the medical field, which are one of important tools for examining internal organs of the human body. The need for endoscopes has increased dramatically. During an endoscopic procedure, an insertion portion of an endoscope is required to extend into and move along a natural lumen of a subject.

Currently, endoscopes are generally composed of three parts, an insertion part, an operation part, and a connection part; the bending structure of the front end of the insertion part is controlled by a knob of the operation part and can bend towards R/L and U/D directions respectively. The knob drives the chain to reciprocate, the chain is connected with one end of the steel wire rope, the other end of the steel wire rope is connected with the bending structure of the insertion part, and the displacement of the chain or the steel wire rope is positively correlated with the bending angle of the insertion part.

In general, in order to prevent mechanical failure caused by improper operation of the operating portion, a limit mechanism is required to control the maximum bending angle, and the limit mechanism has a substantial function of adjusting the displacement amount of the chain or the wire rope. However, the existing limiting mechanism is complex in structure, flexible adjustment of the maximum bending angle cannot be achieved, and the limiting mechanism is inconvenient for users to use.

Disclosure of Invention

Based on this, it is necessary to provide a bending control structure and an endoscope which have a simple structure and facilitate adjustment of the maximum bending angle, aiming at the problem that the current limiting mechanism is complicated and cannot realize the adjustment of the maximum bending angle.

A bend-controlling structure, comprising:

a mounting substrate;

the bending adjusting mechanism comprises two laminated chain wheels and two laminated chains, wherein the two laminated chain wheels and the two laminated chains are arranged on the mounting substrate; each chain corresponds to one chain wheel, and the chain can rotate along with the corresponding chain wheel; and

the limiting mechanism is arranged on the side surface of the mounting substrate; the limiting mechanism can limit the tail end of the chain; the limiting mechanism comprises a limiting block and a limiting adjusting component, the limiting block is arranged at the tail end of the chain, and the limiting adjusting component is arranged on the mounting substrate and corresponds to the limiting block; the limiting and adjusting assembly can limit the limiting block, can move along the length direction of the chain and limit the chain to a required position.

In one embodiment, the limiting and adjusting component comprises a fixed base and an adjusting piece, the fixed base is provided with an adjusting hole and a limiting groove, the limiting groove is communicated with and located on the outer side of the adjusting hole, the fixed base is installed on the side face of the installation substrate and corresponds to the limiting block, one end of the adjusting piece is movably arranged in the adjusting hole and limited in the limiting groove, and the other end of the adjusting piece is located between the fixed base and the chain and used for being abutted to the limiting block.

In one embodiment, the fixing base is provided with two parallel adjusting holes, each adjusting hole corresponds to one limiting groove, each adjusting hole is internally provided with one adjusting piece, and each adjusting piece limits the tail end of one chain through one limiting block.

In one embodiment, the adjusting member includes an adjusting block and a fixing member, the adjusting block is located between the fixing base and the chain, the adjusting block can abut against the limiting block, and the fixing member passes through the adjusting hole and is mounted on the adjusting block.

In one embodiment, the adjusting block has a limiting end and a fixing hole, the limiting end is located on a surface of the adjusting block facing the chain, the limiting block has a matching end, and the matching end is located towards the fixing base.

In one embodiment, the adjusting hole extends along the length direction of the chain, the limiting grooves are multiple in number, and the limiting grooves are arranged in a manner of being arrayed along the length direction of the adjusting hole.

In one embodiment, the end part of the fixing piece is provided with a limiting part, the limiting part is arranged in the limiting groove, and the aperture of the limiting groove is larger than that of the adjusting hole;

The cross section of the limiting part is circular, elliptical or polygonal, or the outer wall of the limiting part is provided with a trimming edge;

the shape of the limiting groove is the same as that of the limiting part, and the size of the joint of two adjacent limiting grooves is smaller than the aperture of the limiting groove;

the fixing piece can be inserted and pulled out to be arranged on the adjusting block and can move relative to the adjusting hole and the limiting groove.

In one embodiment, the adjusting piece further comprises a limit key, the end part of the fixing piece is provided with a mounting groove, and the limit key is detachably mounted in the mounting groove;

the mounting groove is communicated with the limiting groove and corresponds to the mounting groove after the fixing piece is mounted in the adjusting hole, the limiting key can be mounted in the limiting groove, and the limiting key is in interference fit with the limiting groove.

In one embodiment, the limiting mechanism further comprises a cushion block, wherein the cushion block is arranged between the adjusting block and the mounting substrate and is used for adjusting the distance between the adjusting block and the limiting groove.

In one embodiment, the fixing base comprises a fixing plate body and a plurality of protruding parts, the protruding parts protrude relative to the side surfaces and/or the bottom of the fixing plate body, and the fixing plate body is fixed on the mounting substrate through the protruding parts and the fastening pieces.

In one embodiment, the bending control structure further comprises two guiding mechanisms, wherein the two guiding mechanisms are symmetrically arranged on the mounting substrate and are used for guiding the limiting block and the chain;

the guide mechanism comprises a supporting seat and two supporting plates, wherein the supporting seat is arranged on the mounting substrate, one ends of the two supporting plates are arranged on the supporting seat, the supporting plates are bent to form a moving channel, the two supporting plates are arranged in a stacked mode and correspond to one sides of the two chains respectively, and the chains and the limiting blocks are movably arranged in the corresponding moving channels defined by the supporting plates.

An endoscope comprising an insertion tube and a bending control structure as claimed in any one of the above technical features, the bending control structure being connected to the insertion tube to control bending of the insertion tube and to perform an insertion operation.

After the technical scheme is adopted, the invention has at least the following technical effects:

the bending control structure comprises two chain wheels and two chains, wherein the two chain wheels are stacked and arranged on the mounting substrate at intervals, the two chains are respectively arranged corresponding to the two chain wheels, and the two chain wheels and the two chains realize the control of bending of an endoscope insertion tube in the front-back direction and bending of the endoscope insertion tube in the left-right direction. Four stop gear set up in the both sides of mounting substrate respectively, and every two symmetrical stop gear carries out spacingly to the both ends of same chain for the terminal of every chain corresponds a stop gear.

And, stop block of stop gear installs the end to the chain, and spacing adjusting part installs the mounting base plate. When the chain drives the limiting block to move, the limiting adjusting component can be abutted against the limiting block to limit the continuous movement of the chain, and then the chain can limit the bending of the insertion tube through the steel wire rope, so that the limitation of the maximum bending angle of the insertion tube is realized, and the over-stroke bending of the insertion tube is avoided. When the spacing adjusting part moves along the direction of the mounting substrate towards the chain wheel, the distance between the spacing adjusting part and the limiting block can be increased, so that the chain can continuously drive the insertion tube to move through the steel wire, the maximum bending angle of the insertion tube is increased, and the adjustment of the maximum bending angle of the insertion tube is realized.

Therefore, according to the bending control structure, the limiting mechanism is added on the mounting substrate to limit the tail end of the chain, so that the overtravel bending of the insertion tube is avoided, and the damage to the human body cavity is further avoided; meanwhile, the limiting and adjusting component moves relative to the mounting substrate, so that the distance between the limiting and adjusting component and the limiting block is adjusted, the moving stroke of the chain is increased, the maximum bending angle of the insertion tube is increased, and the flexible adjustment of the maximum bending angle of the insertion tube is realized, so that the insertion tube can be better inserted into a human body cavity. Meanwhile, the limiting mechanism is simple in structure, convenient to install and detach and convenient to adjust and use by a user.

Drawings

FIG. 1 is a perspective view of a bend-controlling structure according to an embodiment of the present invention;

FIG. 2 is a partial schematic view of the bend-controlling structure shown in FIG. 1;

FIG. 3 is a partial schematic view of the bend-controlling structure illustrated in FIG. 2;

FIG. 4 is a perspective view of one embodiment of a limit adjustment assembly in the bend control structure illustrated in FIG. 2;

FIG. 5 is a schematic illustration of the stop adjust assembly of FIG. 4 with a spacer eliminated;

FIG. 6 is a perspective view of the stationary base of the limit adjustment assembly of FIG. 4;

FIG. 7 is a perspective view of another embodiment of a limit adjustment assembly in the bend control structure illustrated in FIG. 2;

FIG. 8 is a perspective view of the securing member of the spacing adjustment assembly of FIG. 7;

FIG. 9 is a perspective view of yet another embodiment of a limit adjustment assembly in the bend control structure illustrated in FIG. 2;

FIG. 10 is a front view of the limit adjustment assembly shown in FIG. 9;

FIG. 11 is a perspective view of the securing member of the limit adjustment assembly of FIG. 9;

FIG. 12 is a perspective view of a limit key of the limit adjustment assembly shown in FIG. 9;

fig. 13 is a perspective view of the stationary base of the limit adjustment assembly of fig. 9.

Wherein: 100. a bend control structure; 110. a mounting substrate; 120. a bend adjustment mechanism; 121. a sprocket; 122. a chain; 130. a limiting mechanism; 131. a limit adjusting component; 1311. a fixed base; 13111. an adjustment aperture; 13112. a limit groove; 13113. fixing the plate body; 13114. an extension; 1312. an adjusting member; 13121. an adjusting block; 131211, limit ends; 13122. a fixing member; 131221, mounting slots; 13123. a limit key; 132. a limiting block; 1321. a mating end; 133. a cushion block; 140. a guide mechanism; 141. a support base; 142. and a support plate.

Detailed Description

In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the invention, whereby the invention is not limited to the specific embodiments disclosed below.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Referring to fig. 1-13, the present invention provides a bend-controlling structure 100. The bending control structure 100 is applied to an endoscope for adjusting a bending angle of an insertion tube. Thus, after the insertion tube extends into the lesion site, the bending control structure 100 can adjust the maximum bending angle of the insertion tube, so that the insertion tube can be attached to the lesion site as much as possible, and can conveniently pass over the bending site, and the pain of the insertion tube for inserting into the lesion site is reduced. In this embodiment, the focal site is a human body cavity. Of course, in other embodiments of the invention, the focal site may also be other organs to be examined. Hereinafter, a lesion site will be described as an example of a human body cavity.

Currently, endoscopes are generally composed of three parts, an insertion part, an operation part, and a connection part; the bending structure at the front end of the insertion part is controlled to bend by the knob of the operation part. The knob drives the chain to reciprocate, the chain is connected with one end of the steel wire rope, and the other end of the steel wire rope is connected with the bending structure of the insertion part. In general, in order to prevent mechanical failure caused by improper operation of the operating portion, a limit mechanism is required to control the maximum bending angle, and the limit mechanism has a substantial function of adjusting the displacement amount of the chain or the wire rope. However, the existing limiting mechanism is complex in structure, flexible adjustment of the maximum bending angle cannot be achieved, and the limiting mechanism is inconvenient for users to use.

Therefore, the present invention provides a novel bending control structure 100, and the bending control structure 100 is connected with an insertion tube of an endoscope, so that the maximum bending angle of the insertion tube can be flexibly adjusted to meet the bending requirement of the insertion tube. Moreover, the bending control structure 100 is simple in a manner of adjusting the bending angle of the insertion tube, and is convenient to use. The specific structure of the bending control structure 100 is described below.

Referring to fig. 1 to 13, in an embodiment, the bending control structure 100 includes a mounting substrate 110, a bending adjustment mechanism 120, and four limit mechanisms 130. The bending adjustment mechanism 120 includes two sprockets 121 provided to the mounting substrate 110 and two laminated chains 122, each sprocket 121 corresponding to one chain 122; the chain 122 can rotate with the corresponding sprocket 121. The limiting mechanisms 130 are symmetrically arranged on the side surface of the mounting substrate 110; the limiting mechanism 130 limits the tail end of the chain 122; the limiting mechanism 130 comprises a limiting block 132 and a limiting adjustment assembly 131, the limiting block 132 is arranged at the tail end of the chain 122, the limiting adjustment assembly 131 is arranged on the mounting substrate 110 and corresponds to the limiting block 132, and the limiting adjustment assembly 131 can limit the limiting block 132 and can move along the length direction of the chain 122 and be limited at a required position.

The mounting substrate 110 is a mounting base plate of the bend-controlling structure 100, and the mounting substrate 110 is capable of carrying the various components of the bend-controlling structure 100 such that the bend-controlling structure 100 forms a whole. Further, the bending control structure 100 is mounted in the housing of the endoscope through the mounting substrate 110. The bending adjustment mechanism 120 is provided on the mounting substrate 110, and the bending adjustment mechanism 120 is used to adjust the bending angle of the insertion tube. The bending adjustment mechanism 120 is connected with the insertion tube through a steel wire rope, and when the bending adjustment mechanism 120 moves, the steel wire rope is driven to move, and then the insertion tube is driven to bend through the steel wire rope, so that the bending requirement of the insertion tube is met.

Specifically, the bending adjustment mechanism 120 includes two sprockets 121 and two chains 122. Each chain 122 is disposed corresponding to one sprocket 121, and both ends of each chain 122 are respectively connected to one wire rope, and the other end of the wire rope is connected to the insertion tube. Each sprocket 121 drives the corresponding chain 122 to rotate, and the chain 122 drives the corresponding wire rope to move, so as to drive the insertion tube to bend towards the required direction. One end of the wire rope is directly fixed at the end of the chain 122, the other end of the wire rope is connected with the insertion tube, and the connection relationship between the wire rope and the insertion tube is the prior art and will not be described herein.

With reference to the direction shown in fig. 1, two sprockets 121 are provided on the mounting substrate 110 in the vertical direction, and the two sprockets 121 are disposed at intervals to avoid interference of rotation of the two sprockets 121. The two sprockets 121 are coaxially arranged, but the rotation of the two sprockets 121 is not linked, but separately driven and rotated separately. The bending adjustment mechanism 120 further comprises two adjustment knobs, each of the adjustment knobs corresponds to one of the sprockets 121, the adjustment knob can drive the corresponding sprocket 121 to rotate, and then the chain 122 is driven to move, and then the chain 122 drives the steel wire rope to move, and the steel wire rope drives the insertion tube to bend, so that the insertion function of the insertion tube is achieved. It should be noted that, how the two sprockets 121 are disposed on the mounting base plate 110 and are respectively rotatably disposed, and will not be described herein.

After the two sprockets 121 are stacked, two chains 122 are also stacked and spaced apart, upper and lower, respectively. Based on the mode shown in fig. 1, the upper chain 122 realizes the adjustment of the pitching bending angle of the insertion tube through two corresponding steel wires, and the lower chain 122 realizes the adjustment of the left and right bending angles of the insertion tube through two steel wires. When the elevation angle bending of the chain 122 needs to be adjusted, the upper chain 122 is controlled to rotate clockwise, so that the length of the chain 122 on the upward side is shortened, the length of the chain 122 on the downward side is longer, and the bending control of the elevation angle of the insertion tube is realized.

It should be noted that, the principle of adjusting the bending angle of the insertion tube in the pitch direction by the two chains 122 is substantially the same as that of the bending angle in the left-right direction, and will not be described herein. The bending control structure 100 of the present invention is mainly for explaining the limit mechanisms 130 at the end of the chain 122, and the principle of adjusting the maximum bending angle of the insertion tube in the pitch direction and the lateral direction by each limit mechanism 130 is substantially the same, and only one limit mechanism 130 is described as an example of the cooperation of the chain 122.

Specifically, the bending control structure 100 of the present invention has a limiting mechanism 130, the limiting mechanism 130 is disposed on a side surface of the mounting substrate 110, and the end of the chain 122 corresponds to the limiting mechanism 130, and the end corresponding to the limiting mechanism 130 is adjusted and limited to adjust the maximum moving distance of the chain 122, so as to adjust the maximum bending angle of the insertion tube, and realize the adjustment of the maximum bending angle of the insertion tube in the pitch direction and the left-right direction.

The limiting mechanism 130 comprises a limiting adjusting component 131 and a limiting block 132, the limiting adjusting component 131 is movably arranged on the mounting substrate 110 and located on the side face of the chain 122, and the limiting block 132 is arranged at the tail end of the chain 122. The chain 122 can drive the limiting block 132 to move, so that the limiting block 132 abuts against or is separated from the limiting adjustment assembly 131. When the limiting block 132 is separated from the limiting adjustment assembly 131, a certain distance exists between the limiting block 132 and the limiting adjustment assembly 131, and the chain 122 can be driven to rotate by continuing to rotate the adjustment knob so as to adjust the bending angle of the insertion tube. When the stopper 132 abuts against the stopper regulating member 131, the surface chain 122 is moved to the maximum position, at which time the insertion tube is at the maximum bending angle.

By limiting the maximum bending angle of the insertion tube, the influence of the overlarge bending angle of the insertion tube in the human body cavity can be avoided to the human body cavity, and the completeness of the operation is ensured. Of course, the insertion tube may not meet the requirement of being inserted into the human body cavity at the maximum bending angle, and at this time, it is necessary to increase the maximum bending angle of the insertion tube, and adjust the maximum displacement of the chain 122 to increase the maximum displacement of the wire rope.

Therefore, the bending control structure 100 of the present invention movably disposes the limit adjusting assembly 131 on the mounting substrate 110. After the limiting and adjusting assembly 131 is movably arranged, the distance between the limiting block 132 and the limiting and adjusting assembly 131 can be increased. Thus, when the chain 122 drives the limiting block 132 to move, the chain 122 drives the limiting block 132 to move a distance more, so as to increase the maximum displacement of the steel wire rope and increase the maximum bending angle of the insertion tube.

When the bending control structure 100 of the present invention adjusts the maximum bending angle of the insertion tube, the position of the limit adjustment assembly 131 can be directly adjusted between controlling the bending of the insertion tube, so that the limit adjustment assembly 131 is at the desired maximum bending position. Of course, the bending control structure 100 can also adjust the bending angle of the insertion tube in the process of adjusting the bending angle of the insertion tube, in the adjusting process, the limiting block 132 abuts against the limiting adjustment assembly 131, however, the maximum bending angle of the insertion tube cannot meet the insertion requirement of the insertion tube, at this time, the limiting adjustment assembly 131 is controlled to move leftwards (in the direction shown in fig. 1) so as to enable the limiting adjustment assembly 131 to move a certain distance with the limiting block 132, and then the adjusting knob is continuously operated to drive the chain 122 to move so that the limiting block 132 abuts against the limiting adjustment assembly 131, and the adjustment of the next maximum bending angle of the insertion tube is achieved.

If the maximum bending angle of the insertion tube can meet the insertion requirement, stopping adjusting the position of the limit adjusting component 131; if the maximum bending angle of the insertion tube cannot be inserted into the insertion tube, the maximum bending angle of the insertion tube is continuously adjusted in the above manner until the bending angle of the insertion tube meets the insertion requirement. This increases the flexibility of adjusting the maximum bending angle of the insertion tube.

In order to better illustrate the movement of the limit adjustment assembly 131 relative to the mounting substrate 110, the present invention uses the direction shown in fig. 1 as a reference, and the limit adjustment assembly 131 moves to the left to increase the distance between the limit adjustment assembly 131 and the limit block 132. That is, the stopper 132 can be limited at a desired position by the limiting adjustment assembly 131 moving leftwards along the mounting substrate 110 to adjust the maximum bending angle of the insertion tube.

In the above embodiment, the limiting mechanism 130 is added on the mounting substrate 110 to limit the end of the chain 122, so as to avoid excessive bending of the insertion tube and further avoid damage to the human body cavity; meanwhile, the limit adjusting component 131 also moves relative to the mounting substrate 110 to adjust the distance between the limit adjusting component and the limit block 132, so that the moving stroke of the chain 122 is increased, the maximum bending angle of the insertion tube is increased, and flexible adjustment of the maximum bending angle of the insertion tube is realized, so that the insertion tube can be better inserted into a human body cavity. Meanwhile, the limiting mechanism 130 is simple in structure, convenient to install and detach and convenient to adjust and use by a user.

Alternatively, the number of the stopper mechanisms 130 is two. The two limiting mechanisms 130 are symmetrically disposed on two sides of the mounting substrate, and each limiting mechanism 130 can limit the ends of the two chains 122 on the same side. Optionally, the limiting mechanism 130 includes two limiting blocks 131, the two limiting blocks 131 respectively correspond to the ends of the two chains 122 on the same side, and the two limiting blocks 131 and one limiting adjustment component 131 are matched to limit, so as to adjust the maximum moving distance of the chains 122, further adjust the maximum bending angle of the insertion tube, and realize the adjustment of the maximum bending angle of the insertion tube in the pitching direction and the left-right direction. Of course, in other embodiments of the present invention, the number of the limiting mechanisms 130 may be four. The four limiting mechanisms 130 are symmetrically arranged on two sides of the mounting substrate 110, and two ends of each chain 122 respectively correspond to one limiting mechanism 130, and adjustment limiting is performed on the corresponding ends through the limiting mechanisms 130.

Referring to fig. 2 to 13, in an embodiment, the limit adjustment assembly 131 includes a fixed base 1311 and an adjustment member 1312, the fixed base 1311 has an adjustment hole 13111 and a limit groove 13112, the limit groove 13112 is communicated with and located at an outer side of the adjustment hole 13111, the fixed base 1311 is mounted on a side surface of the mounting substrate 110 and is disposed corresponding to the limit block 132, one end of the adjustment member 1312 is movably disposed in the adjustment hole 13111 and is limited in the limit groove 13112, and the other end of the adjustment member 1312 is located between the fixed base 1311 and the chain 122 and is used for abutting against the limit block 132.

The fixed base 1311 is a base of the limit adjustment assembly 131, and the limit adjustment assembly 131 is mounted to an edge of the mounting substrate 110 through the fixed base 1311. The fixed base 1311 has an adjustment hole 13111 and a limit groove 13112, and the adjustment hole 13111 communicates with the limit groove 13112. The adjusting hole 13111 is provided through the mounting substrate 110, and the limiting groove 13112 is located on a surface of the adjusting hole 13111 away from the limiting block 132. One end of the adjusting member 1312 is mounted to the adjusting hole 13111 and the limiting hole, the other end of the adjusting member 1312 extends out of the adjusting hole 13111, and the end of the adjusting member 1312 extending out of the limiting hole is located on the moving path of the limiting block 132.

When the chain 122 drives the limiting block 132 to move, the limiting block 132 moves toward the adjusting member 1312 and gradually approaches the adjusting member 1312. When the limiting block 132 abuts against the adjusting piece 1312, the adjusting piece 1312 limits the limiting block 132, limits the movement of the limiting block 132, and further limits the movement of the chain 122, so that the chain 122, the limiting block 132 and the steel wire rope are in a static state, and the insertion tube is in a maximum bending angle.

When it is necessary to increase the maximum bending angle of the insertion tube, the end of the adjustment member 1312 moves out of the limiting groove 13112 and can move in the adjustment hole 13111, and at this time, the entire adjustment member 1312 moves leftward with respect to the fixed base 1311 and the mounting substrate 110, increasing the distance between it and the limiting block 132. Thus, when the chain 122 drives the stopper 132 to move, the chain 122 also drives the stopper 132 to continue to move leftwards for a certain distance, so that the stopper 132 abuts against the adjusting member 1312. At this time, the chain 122 moves the wire rope to increase the maximum bending angle of the insertion tube.

Optionally, the edge position of the mounting substrate 110 has a relief groove into which the fixed base 1311 is mounted, facilitating the mounting of the fixed base 1311.

In one embodiment, the fixed base 1311 has two parallel adjustment holes 13111, each adjustment hole 13111 corresponds to one of the limiting grooves 13112, one of the adjustment members 1312 is installed in each adjustment hole 13111, and each adjustment member 1312 limits the end of one of the chains 122 by one of the limiting blocks 132. That is, the fixed base 1311 has two layers of adjustment holes 13111, and each layer of adjustment holes 13111 is correspondingly provided with a set of adjustment members 1312 and limits one limiting block 132.

Referring to fig. 2 to 13, in an embodiment, the adjusting member 1312 includes an adjusting block 13121 and a fixing member 13122, the adjusting block 13121 is located between the fixing base 1311 and the chain 122, the adjusting block 13121 can abut against the limiting block 132, the fixing member 13122 is mounted on the adjusting block 13121 through the adjusting hole 13111, and the fixing member 13122 is limited by the limiting groove 13112.

The fixing member 13122 is used for installing one end of the adjusting member 1312 into the adjusting hole 13111 and the limiting groove 13112, the adjusting hole 13111 is located between the fixing base 1311 and the chain 122, and the fixing member 13122 is connected with the adjusting block 13121. When the fixing piece 13122 adjusts the position in the adjusting hole 13111, the fixing piece 13122 can drive the adjusting block 13121 to move synchronously, so as to change the abutting position of the adjusting block 13121 and the limiting block 132, and realize the adjustment of the maximum bending angle of the insertion tube.

One end of the fixing member 13122 is located in the adjustment hole 13111 and the limit groove 13112, and the other end of the fixing member 13122 protrudes out of the fixing base 1311 and is provided with the limit stopper 132, and the limit stopper 132 is located between the fixing base 1311 and the chain 122 and on the moving path of the limit stopper 132. When the chain 122 drives the stopper 132 to move, the stopper 132 moves toward the adjustment block 13121 and gradually approaches the adjustment block 13121. When the limiting block 132 abuts against the adjusting block 13121, the adjusting block 13121 limits the limiting block 132 to limit the movement of the limiting block 132 and further limit the movement of the chain 122, so that the chain 122, the limiting hole 132 and the steel wire rope are in a static state, and the insertion tube is in a maximum bending angle.

When the maximum bending angle of the insertion tube needs to be increased, the end portion of the fixing member 13122 moves out of the limiting groove 13112 and can move in the adjusting hole 13111, and at this time, the fixing member 13122 can drive the adjusting block 13121 to move leftwards relative to the fixing base 1311 and the mounting substrate 110, so that the distance between the adjusting block 13121 and the limiting block 132 is increased. Thus, when the chain 122 drives the stopper 132 to move, the chain 122 also drives the stopper 132 to continue to move leftwards for a certain distance so that the stopper 132 abuts against the stopper 132. At this time, the chain 122 moves the wire rope to increase the maximum bending angle of the insertion tube.

As shown in fig. 3, the maximum moving distance of the adjustment block 13121 is S. That is, the maximum displacement amount of the chain 122 and the wire rope for adjusting the maximum bending angle of the insertion tube is S. The maximum displacement of the chain 122 and the wire rope controls the maximum bending angle of the insertion tube within the above range, so that the bending requirement of the insertion tube can be met.

Referring to fig. 2-13, in one embodiment, the adjustment block 13121 has a stop end 131211 and a securing aperture into which the securing member 13122 is mounted, the stop end 131211 being located on the surface of the adjustment block 13121 facing the chain 122. When the chain 122 drives the limiting block 132 to move, the limiting block 132 can be abutted to the limiting end 131211, and the limiting end 131211 is used for limiting the movement of the limiting block 132, so that the limitation of the maximum bending angle of the insertion tube is realized.

In an embodiment, the limiting end 131211 is a limiting protrusion, and the limiting protrusion abuts against the limiting block 132 to limit the limiting block 132. Optionally, the surface of the stopper 132 facing the fixed base 1311 has a mating end 1321, and the mating end 1321 can be in abutting engagement with the limiting end 131211 to realize limiting of the stopper 132. Specifically, when the chain 122 drives the stopper 132 to move, the stopper 132 gradually approaches the fixed base 1311, and the mating end 1321 can gradually abut against the limiting end 131211, and the position of the stopper 132 is limited by the limiting end 131211 to limit the mating end 1321.

Optionally, the mating surfaces of the stop end 131211 and the mating end 1321 are inclined surfaces. That is, the retainer end 131211 forms a wedge-like engagement structure with the engagement end 1321, which ensures a secure engagement of the retainer end 131211 with the engagement end 1321. Of course, in other embodiments of the present invention, the mating surfaces of the limiting end 131211 and the mating end 1321 can be flat, curved, or shaped, as long as the limiting block 132 can be limited.

Referring to fig. 2 to 13, in an embodiment, the adjustment hole 13111 extends along the length direction of the chain 122, the number of the limiting grooves 13112 is plural, and the limiting grooves 13112 are arranged in a row along the length direction of the adjustment hole 13111. That is, the adjustment hole 13111 is extended from left to right, and the fixing member 13122 is movably provided in the adjustment hole 13111.

When the fixing member 13122 moves in the adjustment hole 13111, the position of the adjustment block 13121 can be changed to adjust the distance between the stopper 132 and the adjustment block 13121, thereby adjusting the maximum bending angle of the insertion tube. And, the limiting groove 13112 is disposed on the surface of the adjusting hole 13111 away from the limiting block 132, and the limiting groove 13112 communicates with the adjusting hole 13111. The body of the fixing member 13122 is located in the adjustment hole 13111 and protrudes out of the adjustment hole 13111 to be mounted into the fixing hole of the adjustment block 13121.

And, the end of the fixing piece 13122 can be located in the limiting groove 13112, the end of the fixing piece 13122 is matched with the limiting groove 13112, limiting of the fixing piece 13122 can be achieved, and after the adjusting block 13121 is adjusted to a required position, the fixing piece 13122 moves along the adjusting hole 13111. Therefore, the position of the adjusting block 13121 can be reliably limited by the cooperation of the fixing piece 13122 and the limiting groove 13112 after the adjusting block 13121 is adjusted to the required position, the movement of the adjusting block 13121 is avoided, and the limiting block 132 can be reliably limited by the adjusting block 13121.

The number of the limiting grooves 13112 is plural, and the plurality of limiting grooves 13112 are arranged in the longitudinal direction of the adjustment hole 13111. After the fixing member 13122 is moved to one position, the end of the fixing member 13122 is caught in the limiting groove 13112, and the movement of the fixing member 13122 is limited by the limiting groove 13112. When the position of the fixing piece 13122 needs to be adjusted, the end part of the fixing piece 13122 is moved out of the limit groove 13112, and the fixing piece 13122 is pushed to move along the adjusting hole 13111 so as to adjust the position of the fixing piece 13122, thereby achieving the purpose of changing the position of the adjusting block 13121. After the adjusting block 13121 is adjusted to a desired position, the end of the fixing member 13122 is locked into the limit groove 13112 for limiting.

Referring to fig. 2 to 13, in an embodiment, an end portion of the fixing member 13122 has a limiting part mounted in the limiting groove 13112, and the limiting groove 13112 has a larger aperture than the adjusting hole 13111. The limiting portion is located at an end of the fixing piece 13122, and the limiting portion cooperates with the limiting groove 13112 to limit the fixing piece 13122. Specifically, the limiting groove 13112 is located on the side surface of the adjusting hole 13111, and the aperture size of the limiting groove 13112 is larger than that of the adjusting hole 13111, so that after the limiting part is mounted on the limiting groove 13112, the limiting part cannot enter the adjusting hole 13111, and the limiting effect of the limiting groove 13112 and the limiting part after being matched can be guaranteed.

Optionally, the fixing member 13122 is a screw, and the limiting portion is a screw head of an end portion of the screw. Of course, in other embodiments of the present invention, the fixing member 13122 may also be a limiting pin, and the limiting portion is a protrusion disposed at an end of the limiting pin; alternatively, the fixing member 13122 may have other structures that can cooperate with the limiting groove 13112 to limit movement along the adjustment hole 13111.

Referring to fig. 1 to 6, in an embodiment of the present invention, the cross section of the limiting portion is circular, the shape of the limiting groove 13112 is the same as that of the limiting portion, and the size of the connection between two adjacent limiting grooves 13112 is smaller than the aperture of the limiting groove 13112. Like this, spacing portion can't get into adjacent spread groove through the intercommunication department of two spacing grooves 13112 to guarantee spacing groove 13112 to spacing effect of spacing portion, and then guarantee that mounting 13122 is reliably fixed.

Optionally, the limiting portion is cylindrical, and the shape of the limiting groove 13112 is adapted to the shape of the limiting portion. Of course, in the embodiment of the present invention, the limiting portion may also have a conical shape, and the shape of the limiting groove 13112 is adapted to the shape of the limiting portion.

When the position of the adjusting block 13121 needs to be adjusted, the fixing piece 13122 is rotated, so that the fixing piece 13122 is gradually moved out of the adjusting hole 13111 and the limiting groove 13112, and the limiting part can be moved out of the limiting groove 13112. At this time, the user moves the fixing member 13122, and the body portion of the fixing member 13122 can move along the adjustment hole 13111 and enter the next limiting groove 13112 through the communication of the adjacent two limiting grooves 13112. After the position of the adjusting block 13121 reaches the required position, the fixing piece 13122 is screwed, and the fixing piece 13122 gradually moves into the adjusting hole 13111 and the limiting groove 13112, so that the limiting part gradually moves into the limiting groove 13112, the position of the fixing piece 13122 is limited, and the position of the adjusting block 13121 is limited.

Referring to fig. 7 and 8, in another embodiment of the present invention, the outer wall of the limiting portion has a cut edge, the shape of the limiting groove 13112 is the same as that of the limiting portion, and the fixing piece 13122 is configured to be able to be inserted into the adjusting block 13121 and be able to move relative to the adjusting hole 13111 and the limiting groove 13112.

After the outer wall of the limiting part is provided with the trimming, the limiting part can be not completely round any more, the shape of the limiting groove 13112 corresponds to the shape of the limiting part, and the shape of the limiting groove 13112 is not completely round. When the limiting portion having the cut edge is mounted to the limiting groove 13112, the limiting portion cannot rotate in the limiting groove 13112, and the fixing member 13122 is also limited from moving along the adjustment hole 13111 due to the cooperation of the limiting portion and the limiting groove 13112.

In this embodiment, when the position of the adjusting block 13121 needs to be adjusted, the fixing piece 13122 is pulled out of the adjusting hole 13111, so that the limiting portion is separated from the limiting groove 13112, but the end portion of the fixing piece 13122 is further connected to the adjusting piece 1312. At this time, the fixing member 13122 is moved, and the fixing member 13122 can be moved along the adjustment hole 13111, thereby achieving adjustment of the position of the adjustment block 13121. After the adjustment block 13121 is moved to a desired position, the retainer 13122 is inserted from within the adjustment aperture 13111 such that the stop is positioned within the stop slot 13112.

Of course, in other embodiments, the cross section of the limiting portion may be polygonal, elliptical, or any other shape capable of limiting the rotation of the limiting portion in the corresponding limiting groove 13112, the shape of the limiting groove 13112 is the same as that of the limiting portion, and the fixing member 13122 is configured to be capable of being inserted into the adjusting block 13121 and moved relative to the adjusting hole 13111 and the limiting groove 13112. .

Referring to fig. 9 to 13, in still another embodiment of the present invention, the adjusting member 1312 further includes a limit key 13123, and the end of the fixing member 13122 has a mounting groove 131221, and the limit key 13123 is detachably mounted to the mounting groove 131221. After the fixing piece 13122 is installed in the adjusting hole 13111, the installation groove 131221 is correspondingly communicated with the limit groove 13112, the limit key 13123 may also be installed in the limit groove 13112, and the limit key 13123 and the limit groove 13112 are in interference fit.

The limit key 13123 is detachably mounted to the mounting groove 131221 of the end of the fixed member 13122, and the end of the limit key 13123 protrudes out of the end of the fixed member 13122 and is mounted to the limit groove 13112 of the fixed base 1311. At this time, the stopper 13123 cooperates with the stopper groove 13112 to limit the movement of the fixed member 13122, and restricts the movement of the fixed member 13122 along the adjustment hole 13111.

When it is desired to move the fixed member 13122, the limit key 13123 is removed from the mounting groove 131221 and the limit groove 13112, at which time the fixed member 13122 is moved directly so that the fixed member 13122 moves in the adjustment aperture 13111. After the fixing member 13122 is moved to a desired position, the limit key 13123 is fitted into the nearest limit groove 13112 to fix the fixing member 13122.

As shown in fig. 9 to 13, the top of the fixing member 13122 has a cross-shaped mounting groove 131221, and the mounting groove 131221 is used for mounting the limit key 13123. After the limit key 13123 is mounted to the mounting groove 131221, the end of the limit key 13123 protrudes out of the side of the fixing member 13122, and the end of the limit key 13123 protruding out of the mounting groove 131221 is mounted into the limit groove 13112. Alternatively, a plurality of the stopper grooves 13112 are arranged above or below the stopper hole, and at this time, one end of the stopper key 13123 is fitted into the upper or lower fitting groove 131221. Of course, the plurality of limiting grooves 13112 may be arranged in two rows, and the two rows of limiting grooves 13112 are staggered, and the limiting key 13123 is mounted in the nearest upper or lower limiting groove 13112. This can increase the adjustment accuracy.

Optionally, the limit key 13123 is an interference fit with the limit groove 13112. In this way, the stopper 13123 can be prevented from falling out of the stopper slot 13112, and the fixing effect of the stopper 13123 and the stopper slot 13112 on the fixing member 13122 can be ensured. Optionally, the width of the mounting groove 131221 is slightly larger than the width of the limit key 13123, and the two are in clearance fit, so as to facilitate the detachment of the limit key 13123.

Optionally, each of the limiting grooves 13112 is an equidistant groove. Of course, in other embodiments of the present invention, each of the limiting grooves 13112 may be non-equidistant grooves, which is set according to practical requirements. It should be noted that, the smaller the width of the limit key 13123, the smaller the width of the limit groove 13112, and thus the more equidistant grooves on both sides of the adjusting hole 13111, and correspondingly, the higher the adjusting accuracy of the fixing piece 13122, and thus the accuracy of adjusting the maximum bending angle of the insertion tube is increased.

Referring to fig. 2 to 4, in an embodiment, the limiting mechanism 130 further includes a spacer 133, and the spacer 133 is disposed between the adjusting block 13121 and the mounting substrate 110, for adjusting a distance between the adjusting block 13121 and the limiting groove 13112. The spacer block 133 is used for adjusting the distance between the adjusting block 13121 and the chain 122, so that the adjusting block 13121 can accurately limit the limiting block 132.

It can be appreciated that if the distance between the adjusting block 13121 and the chain 122 is too large, the adjusting block 13121 will be close to the edge of the fixed base 1311, and at this time, when the chain 122 drives the stopper 132 to move, the adjusting block 13121 will be separated from the stopper 132, and the stopper 132 cannot be effectively limited. After the cushion block 133 is arranged, the positional relationship of the adjusting block 13121 relative to the chain 122 can be changed, so that the adjusting block 13121 can accurately limit the limiting block 132.

Optionally, the spacer 133 is a washer or other component that enables adjustment of the position of the stopper 132. Of course, in other embodiments of the present invention, the width of the stopper 132 may be increased instead of the pad 133. As shown in fig. 5, the stopper 132 is attached to the fixed base 1311, and no cushion block 133 is disposed between the stopper 132 and the fixed base 1311.

Referring to fig. 2, 6 and 13, in one embodiment, the fixing base 1311 includes a fixing plate body 13113 and a plurality of protrusions 13114, the plurality of protrusions 13114 protrude with respect to a side and/or bottom of the fixing plate body 13113, and the fixing plate body 13113 is fixed to the mounting substrate 110 by the protrusions 13114 in cooperation with fasteners.

The fixing plate 13113 is a main plate of the fixing base 1311, the fixing plate 13113 is located at an edge of the mounting substrate 110, and the fixing plate 13113 is disposed corresponding to the chain 122. The fixed plate body 13113 has an adjustment hole 13111 provided therethrough for mounting the fixing piece 13122, and an end of the fixing piece 13122 mounts the adjustment block 13121. The fixing plate has a plurality of protrusions 13114 at the bottom and/or side thereof, and a portion of the protrusions 13114 is directly protruded to the side of the mounting substrate 110 and fixed to the mounting substrate 110 by screws, and a portion of the protrusions are bent and extended to the surface of the mounting substrate 110 and fixed to the surface of the mounting substrate 110 by screws.

The fixing plate body 13113 can be reliably fixed to the mounting substrate 110 through the plurality of protruding portions 13114, fixing reliability of the fixing base 1311 is guaranteed, and accuracy of the adjusting position of the adjusting block 13121 driven by the fixing piece 13122 is guaranteed. Alternatively, the fixed plate 13113 is integrally formed with the plurality of protrusions 13114 by integrally stamping and bending. Of course, in other embodiments of the present invention, the fixing plate 13113 and the plurality of protrusions 13114 may be provided separately, as long as reliable fixing is ensured.

Referring to fig. 1 to 3, in an embodiment, the bending control structure 100 further includes two guiding mechanisms 140, where the two guiding mechanisms 140 are symmetrically disposed on the mounting substrate 110, and are used for guiding the limiting block 132 and the chain 122.

The guiding mechanism 140 is used for guiding the movement of the limiting block 132, so that the limiting block 132 moves in a preset space, and interference between the limiting block 132 and other components is avoided. The guide mechanism 140 can guide the chain 122, and can prevent the chain 122 from interfering with other components.

The two guide mechanisms 140 are symmetrically disposed on the mounting substrate 110, and each guide mechanism 140 guides two chains 122 stacked at corresponding positions and supports the chains 122 as shown in the figure. The interference of the upper and lower chains 122 is avoided, and the accuracy of the movement of the chains 122 is ensured.

Referring to fig. 1 to 3, in an embodiment, the guide mechanism 140 includes a support base 141 and two support plates 142, the support base 141 is disposed on the mounting substrate 110, one ends of the two support plates 142 are mounted on the support base 141, the support plates 142 are bent to form a moving channel, the two support plates 142 are stacked and disposed to correspond to one sides of the two chains 122, and the chains 122 and the limiting blocks 132 are movably disposed in the corresponding moving channel surrounded by the support plates 142.

That is, the support plate 142 is bent to form a double-layered structure, and one end of the support plate 142 is fixed to the support base 141. The support plate 142 is surrounded by a moving channel, and the chain 122 and the stopper 132 are located in the space. In addition, the chain 122 can drive the limiting block 132 to move in the moving space. The two support plates 142 are of a double-layer structure and are stacked to form a four-layer structure for supporting the corresponding chain 122 and the limiting block 132. Alternatively, the number of the supporting seats 141 is one or two.

Alternatively, the support plate 142 of the four-layered structure has a through hole therethrough, and the mounting substrate 110 has a screw hole. The screws are fixed to the screw holes of the mounting substrate 110 through the four-layered through holes, and then the support seats 141 are engaged, so that the fixing of the respective support plates 142 can be achieved.

Alternatively, the supporting plate 142 is a sheet metal part, and forms a double-layer structure by bending, and encloses a moving channel. Alternatively, the outer wall of the support base 141 has an annular groove into which the edge of the support plate 142 is snapped to effect the fixation of the support plate 142 to the support base 141. Optionally, the height of the annular groove is slightly greater than the thickness of the mounting plate, ensuring that the mounting plate is reliably secured.

Referring to fig. 1 to 13, the bending control structure 100 of the present invention adjusts the position of the adjusting block 13121 by moving the fixing member 13122 in the adjusting hole 13111, so as to change the distance between the adjusting hole 13111 and the stopper 132, thereby achieving the purpose of adjusting the maximum bending angle of the insertion tube. And, the fixed piece 13122 can also realize the limit of the adjusting block 13121 through the cooperation of the fixed piece 13122 and the limit groove 13112, so that the adjusting block 13121 can be reliably locked after the adjusting block 13121 moves to a required position, and the position of the adjusting block 13121 is prevented from moving.

In addition, when the position of the adjusting block 13121 is adjusted, the fixing piece 13122 is unscrewed or pulled out by a distance, and the fixing piece 13122 is directly operated to move along the adjusting hole 13111, so that the adjusting block 13121 can be driven to move, and the fixing piece 13122 is not required to be integrally detached. In the bending control structure 100, the limiting mechanism 130 has the advantages of small number of parts, easy processing, convenient disassembly and assembly, rapid adjustment, simplified design and processing while ensuring the function, and reduced cost.

The present invention also provides an endoscope including an insertion tube and the bending control structure 100 according to any one of the above embodiments, the bending control structure 100 being connected to the insertion tube to control bending of the insertion tube and perform an insertion operation. After the endoscope of the present invention adopts the bending control structure 100 of the above-described embodiment, the bending control structure 100 is connected to the insertion tube through the wire rope to adjust the bending angle of the insertion tube so that the insertion tube can be inserted into the human body lumen. When the bending control structure 100 bends towards any one of the four directions, the chain 122 and the steel wire rope can generate corresponding displacement, and the maximum displacement of the chain 122 and the steel wire rope can be controlled by the cooperation of the limit adjusting component 131 of the limit mechanism 130 and the limit block 132, so that the maximum bending angle of the insertion tube can be adjusted, and the insertion requirement of the insertion tube can be met.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims (12)

1. A bend-controlling structure (100), characterized by comprising:

a mounting substrate (110);

a bending adjustment mechanism (120) including two laminated sprockets (121) and two laminated chains (122) provided on the mounting substrate (110); -each of said chains (122) corresponds to one of said sprockets (121), said chains (122) being rotatable with the corresponding sprocket (121); and

A limit mechanism (130) provided on the side surface of the mounting board (110); the limiting mechanism (130) can limit the tail end of the chain (122); the limiting mechanism (130) comprises a limiting block (132) and a limiting adjustment assembly (131), the limiting block (132) is arranged at the tail end of the chain (122), and the limiting adjustment assembly (131) is arranged on the mounting substrate (110) and corresponds to the limiting block (132); the limiting and adjusting assembly (131) can limit the limiting block (132) and can move along the length direction of the chain (122) and limit the chain (122) to a required position.

2. The bending control structure (100) according to claim 1, wherein the limit adjustment assembly (131) comprises a fixed base (1311) and an adjustment member (1312), the fixed base (1311) has an adjustment hole (13111) and a limit groove (13112), the limit groove (13112) is communicated with and located at the outer side of the adjustment hole (13111), the fixed base (1311) is mounted on the side of the mounting substrate (110) and is disposed corresponding to the limit block (132), one end of the adjustment member (1312) is movably disposed in the adjustment hole (13111) and is limited in the limit groove (13112), and the other end of the adjustment member (1312) is located between the fixed base (1311) and the chain (122) for abutting against the limit block (132).

3. The bend-controlling structure (100) according to claim 2, wherein the fixed base (1311) has two parallel adjustment holes (13111), each adjustment hole (13111) corresponding to one of the limiting grooves (13112), one of the adjustment members (1312) being mounted in each adjustment hole (13111), each adjustment member (1312) limiting an end of one of the chains (122) by one of the limiting blocks (132).

4. The bend-controlling structure (100) according to claim 2, wherein the adjusting member (1312) includes an adjusting block (13121) and a fixing member (13122), the adjusting block (13121) being located between the fixing base (1311) and the chain (122), the adjusting block (13121) being capable of abutting the stopper (132), the fixing member (13122) being mounted to the adjusting block (13121) through the adjusting hole (13111).

5. The bend-controlling structure (100) according to claim 4, wherein the adjustment block (13121) has a limiting end (131211) and a fixing hole, the limiting end (131211) being located at a surface of the adjustment block (13121) facing the chain (122), the limiting block (132) having a mating end (1321), the mating end (1321) being disposed facing the fixing base (1311).

6. The bending control structure (100) according to claim 4, wherein the adjustment hole (13111) extends in a longitudinal direction of the chain (122), the number of the limit grooves (13112) is plural, and the plurality of limit grooves (13112) are arranged in a longitudinal direction of the adjustment hole (13111).

7. The bend-controlling structure (100) according to claim 6, wherein an end of the fixing member (13122) has a stopper portion mounted in the stopper groove (13112), the stopper groove (13112) having a larger aperture than the adjustment hole (13111);

the cross section of the limiting part is circular, elliptical or polygonal, or the outer wall of the limiting part is provided with a trimming edge;

the shape of the limiting groove (13112) is the same as that of the limiting part, and the size of the joint of two adjacent limiting grooves (13112) is smaller than the aperture of the limiting groove (13112);

the fixing piece (13122) can be arranged on the adjusting block (13121) in a pluggable mode and can move relative to the adjusting hole (13111) and the limiting groove (13112).

8. The bend-controlling structure (100) according to claim 7, wherein the regulator (1312) further includes a limit key (13123), the end of the retainer (13122) having a mounting slot (131221), the limit key (13123) being removably mounted to the mounting slot (131221);

After the fixing piece (13122) is installed in the adjusting hole (13111), the installation groove (131221) is communicated with the limit groove (13112), the limit key (13123) can be further installed in the limit groove (13112), and the limit key (13123) is in interference fit with the limit groove (13112).

9. The bend control structure (100) of any one of claims 4 to 8, wherein the spacing mechanism (130) further includes a spacer block (133), the spacer block (133) being disposed between the adjustment block (13121) and the mounting substrate (110) for adjusting a distance between the adjustment block (13121) and the spacing groove (13112).

10. The bend-controlling structure (100) according to any one of claims 2 to 8, wherein the stationary base (1311) includes a stationary plate body (13113) and a plurality of extensions (13114), the plurality of extensions (13114) extending with respect to a side and/or bottom of the stationary plate body (13113), the stationary plate body (13113) being secured to the mounting substrate (110) by the extensions (13114) mating fasteners.

11. The bending control structure (100) according to any one of claims 1 to 8, wherein the bending control structure (100) further comprises two guiding mechanisms (140), the two guiding mechanisms (140) being symmetrically arranged on the mounting substrate (110) for guiding the stopper (132) and the chain (122);

Guide mechanism (140) include supporting seat (141) and two backup pads (142), supporting seat (141) set up in mounting substrate (110), two one end of backup pad (142) install in supporting seat (141), backup pad (142) buckle and set up in order to enclose into the removal passageway, two backup pad (142) range upon range of setting to correspond two respectively one side of chain (122), chain (122) and stopper (132) are movable to be located corresponding backup pad (142) enclose in the removal passageway of establishing.

12. An endoscope comprising an insertion tube and a bending control structure (100) according to any one of claims 1 to 11, said bending control structure (100) being connected to said insertion tube for controlling bending of said insertion tube and performing an insertion operation.