CN116369828A - Active bending tube of endoscope, insertion part and endoscope - Google Patents

Abstract

The invention provides an active bending tube of an endoscope, an insertion part and the endoscope, and belongs to the technical field of endoscopes. The pipe wall of the active bending pipe is provided with a spiral first gap, the active bending pipe is axially provided with a plurality of buckling parts, the buckling parts comprise bulges and grooves positioned at two sides of the first gap, and the bulges can be in rotary fit with the grooves so as to bend the active bending pipe; in the same buckling component, along the spiral direction of the first gap, the radial lower end of the opposite active bending tube in the two ends of the groove is a first end, the higher end is a second end, the first end is provided with a stop part, the stop part is arranged in a protruding mode relative to a spiral extending track corresponding to the second end, and the stop part is used for being matched with a protrusion to stop. According to the invention, the stop part protruding out of the spiral extending track corresponding to the second end is arranged on the first side of the groove, so that the limiting effect of the groove on the protrusion is enhanced, and the groove and the stop part can be matched with the protrusion to avoid torsion when the active bending tube is bent.

Description

Active bending tube of endoscope, insertion part and endoscope

Technical Field

The invention belongs to the technical field of endoscopes, and particularly relates to an active bending tube and an insertion part of an endoscope and the endoscope.

Background

The endoscope is widely used in modern medical treatment, and in specific use, the active bending section of the insertion part can be bent by pulling the traction rope, so that the bending direction of the front end of the insertion part is controlled, and the image information of the target position is acquired.

The active bending section of the existing endoscope is generally formed by connecting a plurality of snake bone units, but because the structure of the snake bone units is difficult to process and the process is complex, U.S. patent publication No. US20070233043A1 discloses a flexible equipment shaft with inclined spiral winding, a shaft with spiral gaps is provided, the structure of the active bending section is simplified while the bending function of the active bending section is realized, the processing difficulty is reduced and the processing process is simplified; however, the active bending section of the structure can be twisted while being bent, so that the position of the equipment such as a camera module at the far end of the active bending section is changed, and the normal use of the equipment is influenced.

Disclosure of Invention

The object of the present application is to provide an active bending tube for an endoscope, an insertion portion and an endoscope, which solve the above technical problems existing in the prior art.

The application is realized in such a way that:

in a first aspect, the present application provides an active bending tube of an endoscope, wherein a wall of the active bending tube is provided with a spiral first gap, the active bending tube is axially provided with a plurality of buckling components, the buckling components comprise protrusions and grooves positioned at two sides of the first gap, and the protrusions can be in running fit with the grooves so as to bend the active bending tube; in the same buckling component, along the spiral direction of the first gap, the radial lower end of the opposite active bending tube in the two ends of the groove is a first end, the higher end is a second end, the first end is provided with a stop part, the stop part is arranged in a protruding mode relative to a spiral extending track corresponding to the second end, and the stop part is used for being matched with a protrusion to stop.

In the above technical scheme, through setting up the buckling parts in the position of first clearance, when the initiative crooked pipe takes place to bend, the protruding and the recess of buckling parts can normal running fit, do not influence the crooked of initiative crooked pipe to, owing to be provided with the backstop portion at the first end of recess for the initiative crooked pipe is crooked no matter what one side is towards, and the recess can both carry out spacing backstop to the arch, avoids protruding breaking away from in the recess, thereby avoids the initiative crooked pipe to appear torsion in the bending.

Further, in the same buckling component, the second end of the groove and the free end of the stopping part are both positioned on the same cross section of the active bending tube.

Further, the edge of the stop part, which is away from the groove, and the edge of the part corresponding to the active bending tube at the first gap are in smooth transition.

Further, the vertical distance from the free end of the stop portion to the spiral extending track corresponding to the second end is smaller than the length of the stop portion along the spiral extending track corresponding to the second end.

Further, the surfaces of the protrusions and the grooves, which are close to each other, are cambered surfaces.

Further, the central angle corresponding to the protrusion is smaller than or equal to 180 degrees.

Further, the buckling component further comprises an avoidance groove, the avoidance groove and the protrusion are located on the same side of the first gap, the avoidance groove is located on one side, away from the groove, of the spiral extension track corresponding to the two ends of the protrusion, and the avoidance groove is used for accommodating the stop portion.

Further, in the same snap-fit component, the free end of the stop is configured to move in the relief groove.

In a second aspect, the present application provides an insertion portion of an endoscope comprising the active bending tube of the endoscope described above.

In a third aspect, the present application provides an endoscope comprising the insertion portion of the endoscope described above.

The beneficial effects of the invention are as follows:

1. according to the invention, the position of the bulge is limited by the groove, when the active bending tube is bent, the groove is matched with the bulge, so that the torsion generated when the active bending tube is bent is limited, the active bending tube can be normally used, the stop part at the first end of the groove is arranged in a protruding way relative to the spiral extending track corresponding to the second end, the limiting effect of the first end on the bulge is enhanced, the bulge is prevented from being separated from the groove, the active bending tube can be ensured to accurately realize rotation, and the insertion part of the endoscope can accurately realize rotation function and accurate rotation angle when in use;

2. according to the invention, the active bending pipes at the two sides of the first gap can synchronously rotate through the matching of the grooves and the protrusions, so that when the active bending pipes are bent, the plurality of snake bone rings can synchronously rotate, and the distal ends of the active bending pipes can accurately realize bending;

3. according to the invention, the avoidance groove matched with the stop part is formed in the active bending pipe at one side of the bulge, so that the stop part can be accommodated in the avoidance groove, and the situation that the active bending pipe cannot be bent to a preset direction due to the fact that the stop part is abutted to the active bending pipe at one side of the bulge when the active bending pipe is bent is avoided;

4. according to the invention, the stop part always moves in the avoiding groove, so that the stop part always is in a stable connection state with the avoiding groove, and the torsion of the active bending pipe during bending is further limited;

5. in the invention, the surfaces of the protrusions and the grooves, which are close to each other, are set to be arc-shaped structures, so that the protrusions can smoothly rotate on the surfaces of the grooves, the bending of the active bending tube is not influenced while the protrusions are limited, the protrusions are positioned in the grooves, the protrusions can support the active bending tube at two sides of the first gap, when the active bending tube is pulled and bent by the traction rope, the protrusions and the grooves can be quickly buckled together and then are in rotary fit, the influence on the length of the active bending tube is small, and the problem of buckling dislocation between the grooves and the protrusions is avoided.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following description will briefly explain the embodiments of the present invention or the drawings used in the description of the prior art, and it is obvious that the drawings described below are only some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of the overall structure of an active bending tube according to a first embodiment of the present application;

FIG. 2 is a schematic view of a portion of an active bending tube without a stop according to a first embodiment of the present application;

FIG. 3 is a schematic view of an active bending tube provided in a first embodiment of the present application without a stop bent toward a second end;

FIG. 4 is a schematic view of an active bending tube provided in a first embodiment of the present application without a stop bent toward a first end;

FIG. 5 is a schematic view of a portion of an active bending tube according to a first embodiment of the present application;

FIG. 6 is a schematic illustration of an active bending tube provided in a first embodiment of the present application bending toward a second end;

FIG. 7 is a schematic illustration of an active bending tube provided in a first embodiment of the present application bending toward a first end;

FIG. 8 is a schematic view of a portion of an active bending tube according to a second embodiment of the present application;

FIG. 9 is a schematic illustration of an active bending tube provided in a second embodiment of the present application bending toward a first end;

FIG. 10 is a schematic view of a portion of an active bending tube according to a third embodiment of the present application;

FIG. 11 is a schematic view of a portion of an active bending tube according to a fourth embodiment of the present application;

fig. 12 is a schematic overall structure of an active bending section according to a fifth embodiment of the present application.

100-active bending tube, 110-first gap, 120-buckling component, 121-protrusion, 122-groove, 122 a-first end, 122 b-second end, 123-escape groove, 124-stop, 124 a-free end, 130-traction channel, 200-mesh, 300-skin, b 1-spiral extension track, b 2-spiral extension track, c-cross section, L1-vertical distance, L2-stop length, L3-first width, L4-second width.

Detailed Description

The following description provides many different embodiments, or examples, for implementing different features of the invention. The elements and arrangements described in the following specific examples are presented for purposes of brevity and are provided only as examples and are not intended to limit the invention.

In the embodiments of the present application, "proximal" and "distal" refer to the endoscope and its accessories in the use environment, with respect to the user's near-far position, wherein the end closer to the user is designated as "proximal" and the end farther from the user is designated as "distal".

The embodiment of the present application provides an active bending tube of an endoscope, as shown in fig. 1 to 12, the tube wall of the active bending tube 100 is provided with a helical first gap 110, the active bending tube 100 is provided with a plurality of buckling components 120 along the axial direction thereof, when the active bending tube 100 is bent, the plurality of buckling components 120 can connect the active bending tube 100 at two sides of the first gap 110, the phenomenon that the active bending tube 100 is twisted is avoided, the buckling components 120 comprise protrusions 121 and grooves 122 positioned at two sides of the first gap 110, the protrusions 121 can be in rotational fit with the grooves 122, so that the active bending tube 100 is bent, when the active bending tube 100 is bent under the driving of an external force, the protrusions 121 can be buckled in the grooves 122, and along with the bending of the active bending tube 100, the protrusions 121 can rotate relative to the grooves 122, so as to ensure that the active bending tube 100 can be bent smoothly, and for easy understanding, an x direction and a y direction in the drawing represent the axial direction of the active bending tube 100, and a y direction represent the radial direction of the active bending tube 100.

The first clearance 110 that is the heliciform on the initiative crooked pipe 100 divides initiative crooked pipe 100 into a plurality of snake bone rings that connect gradually from beginning to end, if do not set up buckling parts 120 on initiative crooked pipe 100, when initiative crooked pipe 100 takes place to bend, can appear relative rotation between two adjacent snake bone rings to lead to initiative crooked pipe 100 to twist reverse, set up buckling parts 120 and can restrict the relative position of two adjacent snake bone rings, avoid appearing relative rotation between the adjacent snake bone ring and lead to initiative crooked pipe 100 to appear the condition of torsion, if twist reverse, the insert portion can not bend according to preset direction and angle, can influence the use of instruments such as camera module of initiative crooked pipe 100 distal end.

In the same buckling component 120, along the spiral direction of the first gap 110, a first end 122a of the groove 122 is provided with a stop part 124, the first end 122a is a lower end of two ends of the groove 122, which is opposite to the radial direction of the active bending tube 100, the other end of the groove 122 along the spiral direction of the first gap 110 is a second end 122b, and the second end 122b is a higher end of two ends of the groove 122, which is opposite to the radial direction of the active bending tube 100; the stop portion 124 is disposed in a protruding manner with respect to the corresponding spiral extending track b1 of the second end 122b, and the stop portion 124 is configured to cooperate with the protrusion 121 to stop.

The explanation of the helically extending trace b1 is specifically that the sidewall of the second end 122b on the active bending tube 100 follows the helically extending trace of the first gap 110.

Since the spiral line of the first gap 110 is disposed obliquely with respect to the radial direction of the active bending tube 100, the position of rotation of the protrusion 121 in the groove 122 is different when the active bending tube 100 is bent toward the first end 122a and toward the second end 122b, and the restriction of the protrusion 121 by the groove 122 is also different, if the stopper 124 is not provided at the first end 122a, the restriction of the protrusion 121 by the first end 122a is weaker when the active bending tube 100 is bent toward the second end 122b, and therefore, the stopper 124 needs to be provided at the first end 122a to enhance the restriction of the protrusion 121 by the groove 122.

Specifically, as shown in fig. 2 to 4, the first end 122a is not provided with the stop portion 124, and at this time, the spiral extension trajectory b1 corresponding to the first end 122a is the same as the spiral extension trajectory b1 corresponding to the second end 122b, along the spiral direction of the first gap 110, the first end 122a is at a low point with respect to the radial direction of the active bending tube 100, that is, the first end 122a is recessed in the radial direction of the active bending tube 100, and the second end 122b is at a high point with respect to the radial direction of the active bending tube 100, that is, the second end 122b protrudes out of the radial direction of the active bending tube 100; in other reference, the direction of the protrusion 121 to the groove 122 may be regarded as the spiral rising direction of the first gap 110, and the first end 122a is located at the rear of the second end 122b in the spiral extending direction of the first gap 110, and the first end 122a is located at the upper left of the second end 122b, as illustrated in fig. 2, when the protrusion 121 is moved upward or downward in the radial direction of the active bending tube 100, the protrusion 121 is easily separated from the groove 122 from the first end 122a when the protrusion 121 is moved upward, and the protrusion 121 is not easily separated from the position of the second end 122b when the protrusion 121 is moved downward, because the first end 122a is less restricted in the radial direction than the first end 122 a.

When the active bending tube 100 is bent, the protrusion 121 rotates in the groove 122, and when the active bending tube 100 is bent toward the second end 122b, as shown in fig. 3, only the first end 122a of the active bending tube 100 is limited insufficiently, and the protrusion 121 is easy to separate from the groove 122 from the first end 122a, when the active bending tube 100 is bent toward the first end 122a, as shown in fig. 4, only the second end 122b of the active bending tube 100 is limited insufficiently, and the protrusion 121 is easy to separate from the groove 122 from the second end 122b, but because the limiting effect of the first end 122a on the protrusion 121 is smaller than that of the second end 122b, when the active bending tube 100 is bent toward the second end 122b, the first end 122a rotates along with the bending of the active bending tube 100, and therefore, the limiting effect of the first end 122a on the protrusion 121 is further reduced relative to the left in fig. 2, and when the active bending tube 100 is bent toward the first end 122a, the protrusion 121 is more easy to separate from the first end 122a, and the limiting effect of the active bending tube 100 on the protrusion 121 is not normally applied for limiting the protrusion 122a, and the limiting effect of the first end 122a is not normally applied for the bending the protrusion 122a is prevented.

As shown in fig. 5 to 7, when the recess 122 and the protrusion 121 are not rotated, in fig. 5, the stop portion 124 is convexly disposed toward the direction of the protrusion 121, and the stop portion 124 is convexly disposed with respect to the corresponding spiral extending track b1 of the second end 122b, so that the stop portion 124 can enhance the limiting effect on the protrusion 121, when the active bending tube 100 is bent toward the second end 122b, as shown in fig. 6, even if the stop portion 124 moves toward the left side, the free end 124a of the stop portion 124 in fig. 6 limits the protrusion 121 more than the first end 122a in fig. 3, so as to avoid the situation that the first end 122a cannot limit the torsion of the active bending tube 100, and when the protrusion of the stop portion 124 is properly protruded, the structure of the stop portion 124 will not abut on the active bending tube 100 on the side where the protrusion is located, thereby affecting the normal cooperation of the protrusion 121 and the recess 122 when the active bending tube 100 is bent toward the first end 122 a; when the active bending tube 100 is bent toward the first end 122a, the second end 122b is also rotated toward the left as shown in fig. 7, but the protrusion 121 is not easily disengaged from the groove 122 because the second end 122b itself has a strong restraining effect on the protrusion 121.

In the application, through the rotation fit of the groove 122 and the protrusion 121, the active bending tube 100 is ensured to be smoothly bent when being pulled by the pulling rope, the first end 122a of the groove 122 is provided with the stop part 124 protruding towards the direction of the protrusion 121, the limiting effect on the protrusion 121 is enhanced, when the active bending tube 100 is bent, the protrusion 121 can be matched with the groove 122 to limit the torsion generated when the active bending tube 100 is bent, the situation that the diameter of a part of the active bending tube 100 possibly appears when the active bending tube 100 is bent is avoided, meanwhile, the connection between the active bending tubes 100 at two sides of the first gap 110 is enhanced, the situation that relative rotation occurs between the active bending tubes 100 at two sides of the first gap 110 is avoided, and the protrusion 121 is not easy to separate from the groove 122, so that the active bending tube 100 can be normally used; compared with the active bending tube 100 formed by splicing a plurality of snake bone units, the active bending tube 100 with the spiral structure has the advantages of simple processing technology, low cost and reduced assembly difficulty.

In specific use, the active bending tube 100 is further provided with two groups of traction channels 130, wherein the traction channels 130 comprise a plurality of traction channels 130 axially arranged along the active bending tube 100, and a traction rope passes through the traction channels 130, so that the active bending tube 100 is pulled, and one group of traction channels 130 corresponds to one bending direction of the active bending tube 100; in this application, a plurality of buckling components 120 axially arranged along the active bending tube 100 are defined as a set of buckling components 120, in order to enhance structural stability of the active bending tube 100, two sets of buckling components 120 are provided on the active bending tube 100, two sets of buckling components 120 and two sets of traction channels 130 are provided along a circumferential direction of the active bending tube 100 at intervals, a set of traction channels 130 is provided between the two sets of buckling components 120, and in order to ensure that the active bending tube 100 can be smoothly bent and cannot twist, the two sets of buckling components 120 and the two sets of traction channels 130 are uniformly provided in the circumferential direction of the active bending tube 100.

After the active bending tube 100 is divided into a plurality of snake bone rings which are connected end to end in sequence by the first gap 110, buckling parts 120 are arranged between any two adjacent snake bone rings, and when the active bending tube 100 is bent, the adjacent snake bone rings are mutually limited to avoid torsion so as to ensure normal bending and use of the active bending tube 100; in addition, in the embodiment provided in the present application, the directions from the protrusions 121 to the grooves 122 in the plurality of fastening components 120 need to be consistent, so that the manufacturing and the production are facilitated; however, in other embodiments, the direction of the protrusions 121 to the recesses 122 in different fastening components 120 may not be uniform.

In order to ensure the running fit of the grooves 122 and the protrusions 121, the surfaces of the protrusions 121 and the grooves 122 close to each other are cambered surfaces, preferably arc surfaces, and after the protrusions 121 are buckled in the grooves 122, the surfaces of the protrusions 121 and the grooves 122 which are contacted with each other can mutually rotate so as to adapt to the bending of the active bending tube 100, preferably, any part of the surfaces of the grooves 122 can be bonded on the surfaces of the protrusions 121 so as to increase the friction force between the protrusions 121 and the grooves 122 and avoid the situation that the protrusions 121 and the grooves 122 are separated; in order to achieve the effect of bending the pipe 100 when the protrusion 121 and the groove 122 are rotationally engaged, after the protrusion 121 is buckled in the groove 122, a part of the surface of the protrusion 121 needs to be not contacted with the groove 122, and the part of the surface is used as a rotation allowance to achieve the effect of rotationally engaging the protrusion 121 and the groove 122, and in general, the protrusion degree of the protrusion 121 is greater than the recess degree of the groove 122.

Referring to fig. 5, the central angle corresponding to the protrusion 121 is smaller than or equal to 180 degrees, and the central angle of the protrusion 121 refers to an angle formed by connecting the two ends of the active bending tube 100 with the center of the cambered surface of the active bending tube, and the angle is 180 degrees at most; when the cambered surface of the protrusion 121 is an arc surface, the protrusion 121 is a minor arc protrusion; the strength of the protrusion 121 in this structure is strong, the width of the protrusion 121 along the corresponding spiral extending track b2 at two ends of the protrusion 121 is defined as a first width L3, the protrusion 121 has a plurality of first widths L3 with different values, the first widths L3 of the protrusion 121 gradually increase along the direction from the groove 122 in the same fastening part 120 to the protrusion 121, so that the width at two ends of the protrusion 121 is the maximum width, the width is defined as a second width L4, the second width L4 is the maximum value of the first widths L3, that is, the width at two ends of the protrusion 121 is the widest along the spiral direction of the first gap 110; the position of the bump 121 with the greatest structural strength is the position connected with the active bending tube 100, so that the connection between the bump 121 and the active bending tube 100 is more stable, when the bump 121 is subjected to the action force of twisting the active bending tube 100, the bump 121 and the active bending tube 100 bear the torsion force together, if the first width L3 is not gradually increased, but is increased and then reduced, the second width L4 is not the maximum value in the first width L3, the bump 121 can present a necking structure, when the bump 121 is subjected to twisting of the active bending tube 100, the position of the bump 121 connected with the active bending tube 100 is easily subjected to stress concentration, and the connection position is easily subjected to transverse fracture, so that the bump 121 is separated from the active bending tube 100, and the structure of the active bending tube 100 is damaged.

Because the active bending tube 100 is bent when being pulled by the traction rope, the length of the active bending tube 100 is shortened, meanwhile, the active bending tube 100 is bent, the buckling and rotation of the bulge 121 and the groove 122 are simultaneously carried out, in some embodiments, when the active bending tube 100 is not bent, the bulge 121 and the groove 122 are in the buckled state, the surfaces of the bulge 121 and the groove 122 are mutually attached, and in the structure, when the active bending tube 100 is bent, on one hand, the length of the active bending tube 100 is not changed due to the fact that the bulge 121 is supported between the active bending tubes 100 on two sides of the first gap 110, the operation by operators is facilitated, meanwhile, the buckling problem between the bulge 121 and the groove 122 is not worried, in the practical implementation, due to the limitation of the manufacturing process, a small gap is always formed between the bulge 121 and the groove 122 when the active bending tube 100 is not bent, at the moment, the bulge 121 is located in the groove 122 near the part of the groove 122, but due to the fact that the gap is too small, when the active bending tube 100 is pulled by the traction rope, the bulge 121 and the groove 122 are rapidly buckled together, and the buckling problem of the bulge 121 and the groove 122 is not influenced, and the buckling problem of the active bending tube is not caused, and the buckling problem of the bulge 121 is not caused when the active bending tube is not being carried out, and the buckling problem is not caused.

The active bending tube 100 in the embodiment of the application may be formed by an integral hollow tube, and then a spiral gap is formed on the wall of the hollow tube, the stop portion 124 and the active bending tube 100 are in an integrally formed structure, the protrusions 121, the grooves 122 and the stop portion 124 on two sides of the first gap 110 may be formed by adjusting the track and the width of the gap, so that the finally formed active bending tube 100 is in an integrally formed structure, the strength and the stability of the structure are enhanced, the phenomena of breakage, bending and the like in the use process are avoided, in other embodiments, the stop portion 124 and the active bending tube 100 may be separately arranged, and the stop portion 124 is fixed on the active bending tube 100 by bonding or other manners.

The protruding degree of the stop portion 124 protruding from the spiral extending track b1 corresponding to the second end 122b is not too large, generally, the connecting line between the free end 124a and the second end 122b of the stop portion 124 may be located at the same cross section c of the active bending tube 100, and the free end 124a of the stop portion 124 refers to the end of the active bending tube 100 where the stop portion 124 is far away from the groove 122, so as to achieve the same effect of limiting the protrusion 121 by the two ends of the groove 122, and no matter which side the active bending tube 100 is bent, the protrusion 121 of the active bending tube 100 can be subjected to the same limiting effect, thereby avoiding the twisting of the active bending tube 100.

In one embodiment, the edge of the stopping portion 124 facing away from the groove 122 needs to smoothly transition with the edge of the portion corresponding to the active bending tube 100 at the first gap 110, so as to avoid a bending angle between the stopping portion 124 and the active bending tube 100, avoid stress concentration of the stopping portion 124 during stopping, and avoid a crack between the stopping portion 124 and the active bending tube 100 due to the acting force of the protrusion 121 on the stopping portion 124 when the stopping portion 124 limits the torsion of the active bending tube 100.

Meanwhile, the vertical distance L1 from the free end 124a of the stop portion 124 to the spiral extending track b1 corresponding to the second end 122b needs to be smaller than the stop portion length L2 of the stop portion 124 along the spiral extending track b1 corresponding to the second end 122b, so that the cross-sectional area of the stop portion 124 in the x-axis direction is increased, the strength of the stop portion 124 is improved, the damage resistance of the stop portion 124 is improved, when the stop portion 124 receives the acting force of the protrusion 121, the stop portion 124 can bear the acting force of the protrusion 121 together with the active bending tube 100, and because the strength of the stop portion 124 is strong, when the protrusion 121 abuts against the stop portion 124, the stop portion 124 is easy to damage; if the vertical distance L1 from the free end 124a of the stop portion 124 to the corresponding spiral extending track b1 of the second end 122b is greater than the length of the stop portion 124 along the corresponding spiral extending track b1 of the second end 122b, the cross-sectional area of the stop portion 124 on the x-axis is reduced, the strength of the stop portion 124 is smaller, when the stop portion 124 receives the acting force of the protrusion 121, on the one hand, the stop portion 124 receives most of the acting force alone, the strength of the stop portion 124 is lower, the stop portion 124 is easy to break, if the active bending tube 100 is in an integral structure, when one stop portion 124 is damaged, the operation of the active bending section is affected, and when the active bending tube 100 is replaced, the active bending tube needs to be replaced completely, so that the strength of the stop portion 124 needs to be improved, and the service life of the active bending tube 100 can be enhanced.

In order to avoid that the existence of the stop portion 124 affects the normal bending of the active bending tube 100, the buckling component 120 further includes an avoidance groove 123, the avoidance groove 123 and the protrusion 121 are located on the same side of the first gap 110, the avoidance groove 123 is located on one side, away from the groove 122, of the corresponding spiral extension track b2 at two ends of the protrusion 121, and the avoidance groove 123 is used for accommodating the stop portion 124.

The spiral extension trajectory b2, which is specifically a spiral trajectory in which the side walls of the active bending tube 100 on both sides of the protrusion 121 extend along the first gap, is explained.

Since the active bending tube 100 is in a hollow cylindrical structure in particular use, the first gap 110 is a cylindrical spiral on the active bending tube 100, the angle of elevation of the spiral determines the position of the stop portion 124 at the first end 122a, when the angle of elevation of the spiral is suitable, the free end 124a and the second end 122b of the stop portion 124 are both located at the same cross section c of the active bending tube 100, and when the active bending tube 100 is bent towards the first end 122a side, the stop portion 124 will not abut against the active bending tube 100 on the side where the protrusion 121 is located, and the stop portion 124 will not affect the normal rotation of the protrusion 121 in the groove 122, and will not affect the normal bending of the active bending tube 100, as shown in fig. 5.

If the lift angle of the spiral line is too large, if the free end 124a and the second end 122b of the stop portion 124 are both located at the same cross section c of the active bending tube 100, then the protruding degree of the stop portion 124 increases, as shown in fig. 8 and fig. 9, when the active bending tube 100 is bent towards the first end 122a side, the stop portion 124 will abut against the active bending tube 100 on the side where the protrusion 121 is located, so that the protrusion 121 cannot continue to rotate in the groove 122, and thus the normal bending of the active bending tube 100 is affected, therefore, an avoidance groove 123 needs to be provided on the active bending tube 100 on the side where the protrusion 121 is located, the structure of the avoidance groove 123 corresponds to that of the stop portion 124, and when the active bending tube 100 is bent towards the first end 122a side, the stop portion 124 can be buckled in the avoidance groove 123, so as to avoid the influence of the stop portion 124 on the bending of the active bending tube 100; in addition, as the lead angle of the spiral line continues to increase, the degree of protrusion of the stopper 124 continues to increase, and there may also be a case where the stopper 124 is already located in the escape groove 123 when the active bending tube 100 has not been rotated, as shown in fig. 10, in which the escape groove 123 needs to have a certain margin so that the first end 122a can continue to move toward the escape groove 123 when the active bending tube 100 is bent toward the first end 122 a.

In another embodiment, the protruding degree of the stopping portion 124 may be increased, where the second end 122b of the groove 122 and the free end 124a of the stopping portion 124 are not required to be located on the same cross section c of the active bending tube 100, the stopping portion 124 is configured to move in the escape groove 123 all the time, whether the active bending tube 100 is bent or not, and whether the active bending tube 100 is bent towards the first end 122a or towards the second end 122b, the stopping portion 124 moves in the escape groove 123 all the time, and in conjunction with fig. 11, the stopping portion 124 is always clamped with the escape groove 123, so as to limit the torsion occurring when the active bending tube 100 is bent, and the two are matched stably, and meanwhile, the stopping portion 124 cannot be separated from the escape groove 123.

Embodiments of the present application also provide an insertion portion of an endoscope including the active bending tube 100 of an endoscope as referred to in any of the foregoing.

When the active bending tube 100 is bent, due to the characteristic of a spiral structure, the first gap 110 on the active bending tube 100 can change along with the bending of the active bending tube 100, the first gap 110 close to the bending side is reduced, the first gap 110 far away from the bending side is enlarged, if the active bending tube 100 is wrapped with the skin 300 according to the structure of a conventional active bending section, the skin 300 is provided with a certain elasticity, when the active bending tube 100 is bent, the reduced first gap 110 is easy to clamp the skin 300, when the active bending tube 100 is restored to the vertical state from the bending state, the enlarged first gap 110 is easy to clamp the skin 300, the normal bending of the active bending tube 100 is influenced, therefore, in order to avoid the situation that the first gap 110 clamps the skin 300, a woven mesh 200 is sleeved outside the active bending tube 100, the skin 300 is arranged outside the woven mesh 200, and is generally made of metal, the woven mesh 200 is not provided with elasticity according to the structure of a conventional active bending section, when the active bending tube 100 is bent or is restored from the bending state, the first gap 110 cannot clamp the metal mesh, the active bending tube 100 can be clamped, the active bending tube 100 can be ensured to be bent, the normal bending of the metal mesh 100 is not limited, and the metal mesh 100 can be limited to be bent, and the normal bending of the active bending tube 100 is prevented from being bent, and the normal bending joint bending is not limited, and the metal mesh 100 can be bent, and the normal bending joint bending can be formed.

Embodiments of the present application also provide an endoscope including an insertion portion of the endoscope mentioned in any of the foregoing aspects; the endoscope in the embodiment of the application may be a bronchoscope, a pyeloscope, a esophagoscope, a gastroscope, a enteroscope, an otoscope, a nasoscope, a stomatoscope, a laryngoscope, a colposcope, a laparoscope, an arthroscope, and the like, and the type of the endoscope is not particularly limited in the embodiment of the application.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.

Claims (10)

1. An active bending tube of an endoscope, which is characterized in that,

the pipe wall of the active bending pipe (100) is provided with a spiral first gap (110), the active bending pipe (100) is axially provided with a plurality of buckling components (120), the buckling components (120) comprise protrusions (121) and grooves (122) positioned on two sides of the first gap (110), and the protrusions (121) can be in rotating fit with the grooves (122) so as to bend the active bending pipe (100);

in the same buckling component (120), along the spiral direction of the first gap (110), the lower end, which is radial to the active bending tube (100), of the two ends of the groove (122) is a first end (122 a), the higher end is a second end (122 b), the first end (122 a) is provided with a stop part (124), the stop part (124) is arranged in a protruding mode relative to a spiral extending track (b 1) corresponding to the second end (122 b), and the stop part (124) is used for being matched with the protrusion (121) to stop.

2. An active bending tube for an endoscope as defined in claim 1, wherein,

in the same buckling component (120), the second end (122 b) of the groove (122) and the free end (124 a) of the stop portion (124) are both located at the same cross section (c) of the active bending tube (100).

3. An active bending tube for an endoscope as defined in claim 1, wherein,

the edge of the stop part (124) facing away from the groove (122) and the edge of the corresponding part on the active bending tube (100) at the first gap (110) are in smooth transition.

4. An endoscope active bending tube according to claim 3, wherein,

the vertical distance from the free end (124 a) of the stop portion (124) to the spiral extending track (b 1) corresponding to the second end (122 b) is smaller than the length of the stop portion (124) along the spiral extending track (b 1) corresponding to the second end (122 b).

5. An active bending tube for an endoscope as defined in claim 1, wherein,

the surfaces of the protrusions (121) and the grooves (122) which are close to each other are cambered surfaces.

6. An endoscope active bending tube according to claim 5 and wherein,

the central angle corresponding to the bulge (121) is smaller than or equal to 180 degrees.

7. An active bending tube for an endoscope as defined in claim 1, wherein,

the buckling component (120) further comprises an avoidance groove (123), the avoidance groove (123) and the protrusion (121) are located on the same side of the first gap (110), the avoidance groove (123) is located on one side, away from the groove (122), of a spiral extension track (b 2) corresponding to two ends of the protrusion (121), and the avoidance groove (123) is used for accommodating the stop portion (124).

8. An endoscope active bending tube according to claim 7 and wherein,

in the same fastening member (120), a free end (124 a) of the stopper (124) is configured to move in the escape groove (123).

9. An insertion section of an endoscope, comprising the endoscope active bending tube of any one of claims 1-8.

10. An endoscope comprising the insertion portion of the endoscope of claim 9.

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