CN116058772A

CN116058772A - Bending tube, insertion portion, and endoscope

Info

Publication number: CN116058772A
Application number: CN202310226779.8A
Authority: CN
Inventors: 周震华
Original assignee: Hunan Vathin Medical Instrument Co Ltd
Current assignee: Hunan Vathin Medical Instrument Co Ltd
Priority date: 2023-03-10
Filing date: 2023-03-10
Publication date: 2023-05-05
Anticipated expiration: 2043-03-10
Also published as: CN116058772B

Abstract

The application discloses a bending tube, an insertion part and an endoscope, and relates to the technical field of medical instruments. The bending tube is used for an endoscope, the bending tube comprises a plurality of slits and a plurality of tube segment units, the slits are distributed along the axial direction of the bending tube, the tube segment units are divided by the slits, the width of the slits is the same, the slits comprise first slits which are arranged in pairs, the tube segment units comprise first tube segment units which are positioned between the first slits, the first tube segment units deform towards one side of the inner surface of the first tube segment units to form guide grooves, and the guide grooves are used for arranging haulage ropes of the endoscope; in the pipe joint units on both sides of the first slit, at least one of the opposite side surfaces is provided with an abutment protrusion, and in the extending direction of the first slit, the abutment protrusion is disposed adjacent to the guide groove. The above scheme can enable the bending tube to achieve a uniform bending form.

Description

Bending tube, insertion portion, and endoscope

Technical Field

The present application relates to the technical field of medical instruments, and more particularly, to a bending tube, an insertion portion, and an endoscope.

Background

With the continuous development of medical technology, endoscopes are widely used in the diagnosis and treatment process of diseases. During the use of the endoscope, the direction of the distal end is adjusted by controlling the bending of the insertion portion, so that image information of the target site is obtained.

In the related art, for example, patent CN104023616a or the like, the width of the bending slit near the wire guide portion is narrower than the width of the other bending slits to increase the minimum radius of curvature of the former predetermined section, thereby alleviating the problem of uneven bending of the bending tube due to processing of the wire guide portion. However, the insertion portion using the above-described bending tube is still likely to be unevenly bent during use, and it is difficult to satisfy the increasingly higher control accuracy requirements.

Disclosure of Invention

The embodiment of the invention provides a bending tube, an insertion part and an endoscope, which can realize uniform bending form of the bending tube.

In order to solve the above problems, the embodiment of the present application adopts the following technical solutions:

in a first aspect, embodiments of the present application provide a bending tube for an endoscope, the bending tube including a plurality of slits arranged along an axial direction thereof and a plurality of tube-segment units divided by the plurality of slits, wherein the plurality of slits have a same width, the plurality of slits include first slits provided in pairs, the plurality of tube-segment units include first tube-segment units located between the first slits, the first tube-segment units are deformed toward an inner surface side thereof to have guide grooves for setting a haulage rope of the endoscope;

in the pipe joint units on two sides of the first gap, at least one of opposite sides is provided with an abutting protrusion, and in the extending direction of the first gap, the abutting protrusion is arranged adjacent to the guide groove.

In a second aspect, embodiments of the present application provide an insertion portion, including a traction rope and the bending tube according to the first aspect of embodiments of the present application, where the traction rope is threaded through the guiding slot.

In a third aspect, embodiments of the present application provide an endoscope, including a handle and an insertion portion according to the second aspect of embodiments of the present application, the handle being connected to the insertion portion.

The technical scheme adopted by the embodiment of the application can achieve the following beneficial effects:

in the bending tube, the insertion portion and the endoscope disclosed in the embodiments of the present application,

first, in the bending tube, the insertion portion and the endoscope disclosed in the embodiments of the present application, by setting the abutment protrusion in the first slit, the pipe section units on both sides of the first slit are abutted in advance by the engagement protrusion, so that the portion of the pipe section unit abutment stroke which is increased due to the guide groove in the related art is offset.

Meanwhile, by combining the characteristic that the widths of the gaps on the bending tube are the same, the rigidity distribution of the bending tube along the axial direction of the bending tube is uniform, and the bending amplitude among the tube section units is approximately the same in the bending process of the bending tube, so that the tube section units are abutted with each other at the same bending angle in the axial direction of the bending tube, the curvature radiuses of the left and right areas of the tube section units tend to be consistent, and the bending tube is in a uniform bending form.

Secondly, because the widths of the gaps of the bending tube are the same, the rigidity distribution of the bending tube along the axial direction of the bending tube is relatively uniform, so that the bending amplitude among the tube section units in the axial direction of the bending tube is approximately the same, the bending deformation of the bending tube in the axial direction tends to be balanced, namely the stress in the axial direction of the bending tube is uniformly distributed, thereby avoiding stress concentration and prolonging the service life of the bending tube.

Thirdly, because the width of each gap of the bending tube is the same, the intensity distribution in the axial direction of the bending tube is relatively uniform, so that the existence of intensity weak points on the bending tube can be avoided, the damage resistance of the bending tube is improved, and the service life of the bending tube is prolonged.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application.

In the drawings:

fig. 1 is a schematic view of a bending tube disclosed in the related art in a bent state;

fig. 2 is a schematic structural view of an insertion portion disclosed in the first embodiment of the present application and a partially enlarged view at a therein;

FIG. 3 is a schematic view of a bending tube according to a first embodiment of the present application in a bent state;

FIG. 4 is a side view of an insert disclosed in the first embodiment of the present application and a partial enlarged view at B thereof;

FIG. 5 is a schematic view of an insert disclosed in a second embodiment of the present application;

FIG. 6 is a schematic view of a portion of a curved tube according to a third embodiment of the present disclosure;

FIG. 7 is a schematic view showing a part of the structure of a bent tube according to a fourth embodiment of the present invention;

FIG. 8 is a schematic view showing a part of the structure of a bent pipe according to a fifth embodiment of the present invention;

fig. 9 is a schematic view showing a part of the structure of a bent pipe according to a sixth embodiment of the present invention.

Reference numerals illustrate:

100-bending pipe, 110-first pipe section unit, 111-guiding groove, 120-second pipe section unit, 130-abutting bulge, 131-abutting cambered surface, 132-transitional cambered surface, 100 a-first gap, 100 b-second gap, 100 c-positioning groove, and,

200-hauling ropes.

Detailed Description

For the purposes, technical solutions and advantages of the present application, the technical solutions of the present application will be clearly and completely described below with reference to specific embodiments of the present application and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

The following describes in detail the technical solutions disclosed in the embodiments of the present application with reference to the accompanying drawings.

Referring to fig. 1, in a related art such as patent CN104023616a, a bending action is achieved by making slits in a tube wall of a bending tube, passing the bending tube through the slits. The height of the part of the bending tube corresponding to the operation wire guiding part is lower than that of other parts, so that the difference of the curvature radiuses of the different parts of the bending tube caused by the middle structural layout is avoided, and the width of the slits at two sides of the operation wire guiding part is set smaller than that of other slits, thereby relieving the problem of the difference of the curvature radiuses.

However, the above-mentioned related and similar techniques have a drawback that the bending form of the bent tube is not uniform in practical application, and the inventors have found that the above-mentioned problem is mainly caused by the fact that the bent tube has slits having a width difference distributed along the axial direction thereof.

Specifically, although the above-described related art can reduce the minimum radius of curvature of the predetermined section before and after the bending slit near the wire guide portion by reducing the slits on both sides of the wire guide portion, the size of the slit directly affects the rigidity of the portion thereof on the corresponding bending tube, which results in a significant gradient of rigidity distribution in the axial direction of the bending tube, as shown in fig. 1, the rigidity of the a 'region being significantly greater than the rigidity of the B' region. In this case, in the course of pulling the bending tube to perform the bending operation, the difference in bending width is likely to occur at the portion where the rigidity of the bending tube is different (even when the portions on both sides of the slit are abutted against each other), and the bending form of the bending tube is uneven.

In addition, the difference in width of the slit also causes a difference in strength in the portion of the curved tube corresponding to the slit, as shown in fig. 1, the strength of the a 'region is significantly greater than that of the B' region, which results in a greater risk of damage to the curved tube corresponding to the portion of lower strength.

In this regard, some embodiments of the present application provide a curved tube for use with an endoscope.

Referring to fig. 2 to 9, the bending tube 100 disclosed in the embodiment of the present application includes a plurality of slits arranged along an axial direction thereof and a plurality of tube segment units divided by the plurality of slits, wherein the plurality of slits have the same width H1, the plurality of slits include first slits 100a arranged in pairs, the plurality of tube segment units include first tube segment units 110 positioned between the first slits 100a, and the first tube segment units 110 are deformed toward an inner surface side thereof to have guide grooves 111, the guide grooves 111 being used to set a traction cable 200 of an endoscope.

It will be appreciated that the gap may form a deformation space in the bending tube 100, through which adjacent tube segment units may approach each other, thereby enabling relative rotation between the tube segment units, and that the cooperation of the plurality of tube segment units may enable bending action of the bending tube 100 as seen in the entire axial direction of the bending tube 100.

Since the widths H1 of the plurality of slits distributed on the bending tube 100 are the same, it is ensured that the rigidity and strength of the portion of the bending tube 100 corresponding to the slit are substantially uniform, and it is possible to avoid the formation of a rigidity gradient and a strength gradient in the axial direction of the bending tube 100.

The bending tube 100 in the embodiment of the present application is an integral molding structure, of course, the specific processing technology is not limited, the slit can be formed by cutting, etching and other technological means, wherein the cutting technology can be preferably a laser cutting technology, the processing efficiency and the processing precision can be optimized, and the molded bending tube 100 has higher overall strength.

Regarding the first slits 100a, the paired arrangement means that the first slits 100a are adjacently arranged on the bending tube 100 to define therebetween a first joint unit 110, the first joint unit 110 being for providing the guide groove 111 of the endoscope.

In the related endoscope technique, the bending operation of the bending tube 100 is performed by the traction force applied by the traction rope 200, the traction rope 200 is provided in the guide groove 111, and the guide groove 111 can restrict the traction rope 200 so that the traction rope 200 pulls the bending tube 100 on a predetermined path to perform the bending operation. The guide groove 111 is formed by deforming the pipe wall of the first pipe joint unit 110, and can be generally realized by adopting a stamping process mode; and with such a structural layout, it is easy to perform a machining operation on the outer surface side of the first pipe joint unit 110, which side has a larger working space, thereby reducing the machining difficulty.

The multiple pipe joint units in the embodiment of the present application include a second pipe joint unit 120 except the first pipe joint unit 110, where the second pipe joint unit 120 is a pipe joint unit without the guide groove 111. Of course, the plurality of slits of the present embodiment includes a second slit 100b, which is located between two adjacent second pipe joint units 120, in addition to the first slit 100 a.

As shown in fig. 2, the pipe section units adjacent to the first pipe section unit 110 may be configured as the second pipe section unit 120, so that the first pipe section unit 110 performs a limiting function on the traction rope 200 in the radial direction from inside to outside, and the second pipe section unit 120 performs a limiting function on the traction rope 200 in the radial direction from outside to inside, and both may perform alternately distributed and opposite limiting functions on the traction rope 200 in the radial direction of the bent pipe 100, thereby being capable of optimizing the guiding of the traction rope 200 on a preset path. Of course, the embodiment of the present application is not limited thereto, and a plurality of first pipe joint units 110 may be provided in succession in the embodiment of the present application.

The plurality of guiding grooves 111 cooperating with the same traction rope 200 are usually coaxially arranged to optimize the guiding and limiting action. Of course, in an embodiment where the bending tube 100 is perforated with a plurality of traction ropes 200, the bending tube 100 needs to be provided with a plurality of sets of guide grooves 111.

Meanwhile, in the pipe joint units on both sides of the first slit 100a, at least one of the opposite sides is provided with an abutment protrusion 130, and the abutment protrusion 130 is disposed adjacent to the guide groove 111 in the extending direction of the first slit 100 a.

It will be appreciated that the abutment projections 130 may be provided in both pipe joint units on both sides of the first slit 100a, or one of the abutment projections 130 may be provided. In combination with the foregoing, the two pipe joint units on both sides of the first slit 100a may be the first pipe joint unit 110, or may be the first pipe joint unit 110 and the second pipe joint unit 120 that are adjacently disposed.

The "opposite side surfaces" are side surfaces of the two pipe joint units on both sides of the first slit 100a, which correspond to each other in the axial direction of the bent pipe 100, and through which the pipe joint units come into contact in the process of bending the bent pipe 100.

As is known from the related art including the patent CN104023616a, the arrangement of the guide groove 111 causes the adjacent two pipe joint units to have a height difference in the radial direction of the bent pipe 100, and thus the adjacent two pipe joint units are abutted later, which is equivalent to increasing the abutting stroke between the pipe joint units, so that the bending angle becomes larger and the radius of curvature becomes smaller, which is one of the reasons why the uniform bending of the bent pipe 100 cannot be achieved.

In the embodiment of the present application, the abutment protrusion 130 is located in the first slit 100a, which can shorten the interval distance between two pipe joint units at two sides of the first slit 100a, that is, reduce the abutment stroke of the two pipe joint units, and the effect is more remarkable because the abutment protrusion 130 is disposed adjacent to the guide groove 111. In the process of bending the pipe 100, the abutting protrusion 130 can perform a joining function, and can be expressed as abutting the pipe joint units on both sides of the first slit 100a in advance, so that the portion of the related art in which the abutting stroke between the pipe joint units is increased due to the guide groove 111 is offset, and the bending angle therebetween is reduced and the radius of curvature is increased.

Based on the above layout and through the preset dimensions, when the bending tube 100 is in a bending state, the bending angle between two tube segment units on both sides of the first slit 100a can be made equal to the bending angle between other adjacent tube segment units, and the curvature radii of the left and right regions of each tube segment unit are made equal. Referring specifically to fig. 3, the bending angle between the first pipe section unit 110 and the adjacent second pipe section units 120 is α1, and the bending angle between the adjacent two second pipe section units 120 is α2, where α1 is equal to α2; the radius of curvature of the left and right regions of the first pipe joint unit 110 and the adjacent second pipe joint unit 120 (which realize relative rotation) is R1, the radius of curvature of the left and right regions of the other second pipe joint units 120 is R2, and R1 is equal to R2.

As can be seen, the structural layout characteristics of the bending tube 100 according to the embodiments of the present application determine that the bending tube 100 can achieve a uniform bending shape in terms of size design.

On this basis, since the widths H1 of the slits are the same, the rigidity distribution of the bent pipe 100 in the axial direction thereof is relatively uniform, the bending ranges between the pipe joint units are substantially the same or close, the pipe joint units are further ensured to be abutted at substantially the same bending angle, and even if the traction force is continuously applied via the traction rope 200 in the abutted state, the magnitudes of the continuous bending deformation of the pipe joint units on the bent pipe 100 are substantially the same because the capacities of the pipe joint units against elastic deformation are the same or similar, so that the bent pipe 100 can be ensured to achieve a uniform bending form.

In contrast, as shown in fig. 1, the rigidity of each tube segment unit of the bending tube is different, especially, the rigidity difference at the slits corresponding to different widths is more obvious, specifically, the rigidity of the a 'region is obviously greater than the rigidity of the B' region, which makes the resistance of different parts in the axial direction of the bending tube to elastic deformation different, and then, during the bending process of the bending tube, the bending tube shows the following bending shape: the pipe joint units which are not abutted exist, the pipe joint units which are not abutted can relatively rotate to an abutting state along with the increase of traction force applied by the traction rope, and the pipe joint units which are abutted can relatively rotate to excessive bending.

As can be seen, the bending tube of the related art always has a difference in bending amplitude in its axial direction, so that a uniform bending form cannot be achieved.

As can be seen from comparison, the bending tube 100 disclosed in the embodiments of the present application can significantly improve the bending uniformity compared to the related art, thereby realizing a uniform bending form of the bending tube 100.

Because the bending amplitude of the bending tube 100 in the embodiment of the present application is approximately the same among the tube segment units in the axial direction during bending, the stress on the bending tube 100 during bending can be uniformly distributed, so as to avoid stress concentration, and thus the service life of the bending tube 100 can be prolonged.

In addition, the width H1 of each slit arranged along the axial direction of the bending tube 100 is the same, so that the strength distribution of the bending tube 100 in the axial direction is uniform, and the bending tube 100 can be prevented from having strength weak points, thereby improving the damage resistance of the bending tube 100 and prolonging the service life of the bending tube 100.

It should be noted that, the embodiment of the present application does not limit the specific shape of the tube body of the bending tube 100, and other shapes, such as a square tube, may be used instead of the circular tube shape shown in fig. 2, and may be specifically set according to the actual application of the endoscope insertion portion.

Regarding the extending direction of the slits, as shown in fig. 2 to 9, the slits are all arranged extending in the circumferential direction of the bent pipe 100; of course, the slit may be spirally extended along the circumferential direction of the bending tube 100.

As shown in fig. 2 and 5, in some embodiments of the present application, the abutment protrusion 130 includes an abutment cambered surface 131 provided at an abutment side thereof.

It will be appreciated that, in order to achieve a bending operation, the bending tube 100 is a flexible tube, so that during the bending process of the bending tube 100, there is a slight misalignment between the tube segment units, and the abutment protrusion 130 is a portion that abuts against the opposite side surface of the tube segment unit, and when the slight misalignment occurs, stress concentration is often occurred, and the bending tube 100 is damaged.

In this embodiment, the abutment cambered surface 131 enables the abutment protrusion 130 to smoothly transition with the abutment surface when abutment is achieved, and particularly when a small dislocation occurs in an adjacent pipe joint unit, the abutment protrusion 130 can be prevented from contacting the abutment surface in a abrupt structure (for example, a corner exists at the end of a square protrusion), so that stress concentration can be prevented from occurring in the abutment protrusion 130 when the adjacent pipe joint unit is joined, and damage to the bent pipe 100 can be avoided.

In some embodiments of the present application, at least one side surface of the two sides of the abutment protrusion 130 along the extending direction of the first slit 100a is provided with a transition arc surface 132 connected with the corresponding pipe joint unit. For example, as shown in fig. 5, the first pipe joint unit 110 is provided with an abutment protrusion 130, and the side surface of the abutment protrusion 130, which is away from the guiding groove 111 along the extending direction of the first slit 100a, is provided with a transitional cambered surface 132; of course, in another embodiment, the second pipe joint unit 120 on the side of the first gap 100a may also be provided with an abutment protrusion 130 having a transitional cambered surface 132.

It can be understood that, when the bent pipe 100 is in a bent state, the pipe joint units on two sides of the first slit 100a are connected by the abutting protrusion 130, and the portion corresponding to the abutting protrusion 130 and the vicinity thereof on the pipe joint unit belong to a region with larger stress, particularly, stress concentration is more likely to occur at the abrupt cross-sectional shape position, and the connection portion between the abutting protrusion 130 and the corresponding pipe joint unit is the abrupt cross-sectional shape position. In this embodiment, the abutment protrusion 130 is connected to the corresponding pipe joint unit through the transition cambered surface 132, so that the connection portion of the two is smoothly transited by the layout, thereby avoiding the occurrence of stress concentration and achieving the effect of avoiding damage to the bent pipe 100.

In some embodiments of the present application, the pipe joint units at two sides of the first slit 100a are provided with the abutting projections 130, and in the extending direction of the first slit 100a, the abutting projections 130 on the pipe joint units at two sides of the first slit 100a are correspondingly arranged or staggered. As shown in fig. 6, the abutment projections 130 on the first pipe joint unit 110 and the second pipe joint unit 120 on both sides of the first slit 100a are correspondingly provided in the extending direction of the first slit 100 a; as shown in fig. 7, the abutment projections 130 on the first pipe joint unit 110 and the second pipe joint unit 120 on both sides of the first slit 100a are offset in the extending direction of the first slit 100 a.

It will be appreciated that in the embodiment in which only one of the pipe joint units on both sides of the first slit 100a is provided with the abutment protrusion 130, the stress concentration portion of the region of the first slit 100a includes the end portion of the abutment protrusion 130 (corresponding to the opposite side surface on which the abutment protrusion 130 is not provided) and the center position of the end portion of the first slit 100a when the bent pipe 100 is in the bent state, which tends to cause deflection of the stress distribution of the bent pipe 100 in the region of the first slit 100a, which leads to a high risk of damage to the bent pipe 100 due to the concentration of internal stress.

In the embodiment in which the abutment protrusions 130 are correspondingly disposed, the abutment protrusions 130 on the pipe joint units on both sides of the first slit 100a extend, that is, the abutment strokes of the two pipe joint units are reduced by the abutment protrusions 130 on the two abutment protrusions 130 in the first slit 100a, so that when the two correspondingly disposed abutment protrusions 130 abut, the stress concentration portion of the area of the first slit 100a includes the contact positions of the two corresponding abutment protrusions 130 and the central position of the end of the first slit 100a, and therefore, under the structural layout, the stress distribution area of the curved pipe 100 in the area of the first slit 100a is balanced, so that the risk of damage of stress concentration of the curved pipe 100 is reduced.

In the embodiment in which the abutting projections 130 are arranged in a staggered manner, any pipe joint unit on two sides of the first slit 100a can be abutted with the opposite side surface of another pipe joint unit through the abutting projections 130 thereon, so that the number of abutting positions of the pipe joint units on two sides of the first slit 100a when the bent pipe 100 is bent can be remarkably increased, and the stress of the first slit 100a and the adjacent areas thereof can be more uniformly distributed relative to the extending direction of the first slit 100a, thereby reducing the stress concentration degree of the single abutting position and achieving the purpose of reducing the risk of damage due to stress concentration.

In the embodiment in which the abutment projections 130 are offset, the abutment projections 130 at different positions in the extending direction of the first slit 100a may be adaptively set in height, so that the abutment projections 130 at different positions can simultaneously achieve abutment.

As shown in fig. 6, in some embodiments of the present application, the abutment protrusions 130 of the pipe joint units on both sides of the first slit 100a are disposed correspondingly, and the heights of the abutment protrusions 130 on the two are the same.

It will be appreciated that, in such an arrangement, when the two corresponding abutment projections 130 abut, the stress concentration portion of the first slit 100a region includes the contact positions of the two corresponding abutment projections 130 and the center position of the end portion of the first slit 100a, and the contact positions of the two corresponding abutment projections 130 and the center position of the end portion of the first slit 100a are substantially collinear with the axis l of the first slit 100a due to the same height, so that the stress distribution of the first slit 100a region is substantially symmetrically distributed with respect to the axis l of the first slit 100a, and the occurrence of a situation that the stress concentration degree of one side of the first slit 100a region is relatively large is obviously prevented, thereby greatly reducing the risk of damaging the bending tube 100 due to stress concentration.

In some embodiments of the present application, in the pipe joint units at both sides of the first slit 100a, one of them is provided with an abutment protrusion 130, and the other is provided with a positioning groove 100c corresponding to the abutment protrusion 130. For example, as shown in fig. 8, two sides of the first slot 100a are provided with a first pipe joint unit 110 and a second pipe joint unit 120, the first pipe joint unit 110 is provided with an abutment protrusion 130, and the second pipe joint unit 120 is correspondingly provided with a positioning slot 100c.

It will be appreciated that during bending of the bending tube 100, there is a slight misalignment between the tube segment units, which can affect the bending stability of the bending tube 100. In this embodiment, in the case where the pipe joint units on both sides of the first slit 100a are engaged by the abutting projections 130 to achieve the abutting, the abutting projections 130 extend into the positioning groove 100c, and the abutting projections 130 are in limit fit with each other in the circumferential direction of the bent pipe 100, so that the abutting projections 130 can be prevented from slipping due to extrusion, and also small dislocation between the pipe joint units can be avoided, thereby significantly improving the stability of the bent pipe 100 in the bending process.

Further, in an embodiment in which there are a pair of abutment projections 130 provided correspondingly in the extending direction thereof in the first slit 100a, one of them is provided with a positioning groove 100c at the abutment end thereof. For example, as shown in fig. 9, the first slit 100a has a first pipe section unit 110 and a second pipe section unit 120 on two sides, each of which is provided with an abutment protrusion 130, and the abutment protrusion 130 of the second pipe section unit 120 is provided with a positioning groove 100c at an abutment end thereof.

It can be understood that under such a layout, the abutting projections 130 correspondingly arranged by the abutting projections 130 can make the stress distribution of the first slit 100a region relative to the extending direction more uniform, and meanwhile, the situation of slipping of the abutting projections 130, slight dislocation between pipe joint units, etc. can be avoided by the limit fit of the positioning groove 100c and the abutting projections 130, and of course, the bottom layer scheme of the abutting projections 130 can realize the uniform bending form of the bending pipe 100, so that the structural layout of the embodiment realizes multiple beneficial effects.

As shown in fig. 2, on the same pipe joint unit, the abutment projections 130 on both sides of the guide groove 111 are symmetrically distributed with respect to the axis O of the bending pipe 100 (specifically, the pulling rope 200 may be referred to as a pulling rope 200, and the pulling rope 200 is arranged to extend substantially in the axial direction of the bending pipe 100). It will be appreciated that, as described above, when the bending tube 100 is in the bending state, the abutment projections 130 and the vicinity thereof belong to the portions with larger stress, and the abutment projections 130 on both sides of the guiding groove 111 are symmetrically distributed with respect to the axis O of the bending tube 100, so that the stress of the first slit 100a and the vicinity thereof can be more uniformly distributed with respect to the axis O of the bending tube 100, thereby reducing the risk of damage due to stress concentration of the bending tube 100.

As shown in fig. 4, the width of the pipe joint unit is H2, and the embodiment of the application does not limit the width H2 of the pipe joint unit, for example, in the embodiment shown in fig. 4, there may be a plurality of different widths H2 of the pipe joint unit.

In some embodiments of the present application, the width H2 of any two pipe joint units is the same. It can be understood that the width H2 of the pipe joint unit directly affects the rigidity and strength of each portion of the bent pipe 100 where the pipe joint unit is located, and under the condition that the widths H2 of any two pipe joint units are the same, the rigidity distribution and the strength distribution of the bent pipe 100 along the axial direction of the bent pipe tend to be uniform, which is more beneficial to realizing the uniform bending form of the bent pipe 100.

Referring to fig. 2 to 9, the embodiment of the present application further provides an insertion portion including a traction rope 200 and the bending tube 100 according to any one of the above schemes, and the insertion portion has the beneficial effects of the bending tube 100, which are not described herein.

The traction rope 200 is inserted into the guiding groove 111, and the guiding groove 111 plays a role of guiding the traction rope 200 along the axial direction of the bending tube 100. In the process of pulling the bending tube 100 by the traction rope 200 to perform the bending operation, the tube segment units on both sides of the first slit 100a are engaged by the abutting projections 130 to perform the abutting, so that the radius of curvature of the left and right regions of each tube segment unit in the axial direction of the bending tube 100 is equal, and the bending width of each tube segment unit is substantially the same due to the same width H1 of each slit, thereby realizing a uniform bending form of the bending tube 100.

The embodiment of the application also provides an endoscope, which comprises a handle and the insertion part, and the endoscope has the beneficial effects of the insertion part and is not repeated herein.

Wherein the handle is connected with the insertion portion. The user pulls the pulling rope 200 through the control handle, and pulls the bending pipe 100 through the pulling rope 200 to perform bending operation, in the process, the pipe section units on two sides of the first slit 100a are connected through the connection protrusion 130 to realize connection, so that the curvature radiuses of the left and right regions of each pipe section unit in the axial direction of the bending pipe 100 are equal, and the bending amplitude of each pipe section unit is approximately the same due to the same width H1 of each slit, so that the bending pipe 100 realizes a uniform bending form.

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.

In the embodiments described above, the differences between the embodiments are mainly described, and as long as there is no contradiction between the different optimization features between the embodiments, the different optimization features may be combined to form a better embodiment, and in consideration of brevity of line text, the description is omitted here.

The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and changes may be made to the present application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. which are within the spirit and principles of the present application are intended to be included within the scope of the claims of the present application.

Claims

1. A bending tube for an endoscope, characterized in that the bending tube comprises a plurality of slits arranged in an axial direction thereof and a plurality of tube segment units divided by the plurality of slits, wherein the plurality of slits have the same width, the plurality of slits comprise first slits arranged in pairs, the plurality of tube segment units comprise first tube segment units positioned between the first slits, the first tube segment units are deformed toward an inner surface side thereof to have guide grooves for setting a haulage rope of the endoscope;

in the pipe joint units on both sides of the first slit, at least one of the opposite sides is provided with an abutment protrusion, and in the extending direction of the first slit, the abutment protrusion is disposed adjacent to the guide groove.

2. A curved tube according to claim 1, wherein the abutment projection comprises an abutment curved surface provided on an abutment side thereof.

3. A bending tube according to claim 1, wherein at least one side surface of the abutment projection on both sides in the extending direction of the first slit is provided with a transitional cambered surface connected with the corresponding tube segment unit.

4. The bending tube according to claim 1, wherein the tube segment units on both sides of the first slit are provided with the abutment protrusions, and the abutment protrusions on the tube segment units on both sides of the first slit are correspondingly arranged or arranged in a staggered manner in the extending direction of the first slit.

5. The bending tube according to claim 4, wherein the abutment projections of the tube segment units on both sides of the first slit are provided correspondingly, and the abutment projections on both sides are the same in height.

6. A bent pipe according to any one of claims 1 to 5, wherein in the pipe section units on both sides of the first slit, one is provided with the abutment projection and the other is provided with a positioning groove corresponding to the abutment projection.

7. A bending tube according to any one of claims 1 to 5, wherein the abutment projections on both sides of the guide groove are symmetrically distributed with respect to the axis of the bending tube on the same tube segment unit.

8. A bent pipe according to any one of claims 1 to 5, wherein the width of any two of the pipe section units is the same.

9. An insertion portion comprising a traction rope and the bending tube according to any one of claims 1 to 8, wherein the traction rope is passed through the guide groove.

10. An endoscope comprising a handle and the insertion portion of claim 9, the handle being connected to the insertion portion.