CN221671616U - Endoscope butt joint structure and endoscope - Google Patents

Abstract

The utility model is applicable to the technical field of endoscopes, and provides an endoscope butt joint structure and an endoscope, wherein the endoscope butt joint structure comprises: the handle comprises a handle shell, a sheath and a first butt joint piece; the handle shell comprises an upper shell and a lower shell, and the upper shell is in butt joint with the lower shell; the first butt joint piece is arranged in the sheath, the first butt joint piece is used for being connected with the second butt joint piece in the handle shell, and the sheath is arranged at the far end of the handle shell through the first butt joint piece; one of the distal end of the handle shell and the proximal end of the first butting piece is provided with a limiting protrusion, the other one of the distal end of the handle shell and the proximal end of the first butting piece is provided with a limiting groove, the limiting protrusion extends into the limiting groove, and the two are in limiting fit in the radial direction of the butting structure. Through the cooperation of the limiting protrusion and the limiting groove in the structure, the limit cooperation of the handle shell in the radial direction is realized, and the handle shell is not easy to disassemble when being violently disassembled.

Description

Endoscope butt joint structure and endoscope

Technical Field

The utility model relates to the technical field of endoscopes, in particular to an endoscope butt joint structure and an endoscope.

Background

Endoscopes are a commonly used medical device that can be directly accessed into the natural canal of the human body to provide the physician with sufficient diagnostic information to treat the disease. When in use, the insertion part of the endoscope enters the human body through the natural duct of the human body or through the small incision made by the operation, and the doctor can directly peep at the change of the related parts. An instrument channel tube is provided in the insertion portion of the endoscope, an instrument inlet is provided in the handle of the endoscope, and a medical instrument (biopsy forceps, graspers, scissors, etc.) can be introduced into the instrument channel tube of the endoscope through the instrument inlet and into the field of view, and biopsy sampling or the like can be performed by the medical instrument.

In the prior art, the distal end of the endoscope handle shell is usually sheathed with a knob, the snake bone at the distal end of the insertion part is controlled to turn through the rotation of the knob, and the knob rotates relative to the shell for a long time, so that the strength of the knob is weakened, and the shell is more easily detached by violence.

Disclosure of utility model

The utility model aims to provide an endoscope butt joint structure and an endoscope, which are used for solving the technical problems in the prior art and mainly comprise the following contents:

in one aspect, the present application provides an endoscope docking structure comprising: the handle comprises a handle shell, a sheath and a first butt joint piece;

The handle shell comprises an upper shell and a lower shell, and the upper shell is in butt joint with the lower shell;

The first butt joint piece is arranged in the sheath, the first butt joint piece is used for being connected with the second butt joint piece in the handle shell, and the sheath is arranged at the far end of the handle shell through the first butt joint piece;

One of the distal end of the handle shell and the proximal end of the first butt joint piece is provided with a limiting protrusion, the other is provided with a limiting groove, the limiting protrusion extends into the limiting groove, and the two are in limiting fit in the radial direction of the butt joint structure.

Further, in order to better realize the utility model, the following arrangement structure is adopted: the first butt joint piece is provided with a pre-dispensing groove arranged at the butt joint end of the opposite handle shell, and the pre-dispensing groove is used for presetting glue solution.

Further, in order to better realize the utility model, the following arrangement structure is adopted: the top of the limiting groove is provided with the pre-dispensing groove, and/or the bottom surface of the inner wall of the limiting groove is provided with the pre-dispensing groove, and/or the side surface of the inner wall of the limiting groove is provided with the pre-dispensing groove.

Further, in order to better realize the utility model, the following arrangement structure is adopted: the pre-dispensing groove arranged at the top of the limiting groove extends along the axial direction of the first butt joint part; the pre-dispensing groove arranged on the bottom surface of the inner wall of the limit groove extends along the axial direction of the first butt joint part; and the pre-dispensing groove is also used for being matched with the die in a positioning way in the injection molding process.

Further, in order to better realize the utility model, the following arrangement structure is adopted: the pre-dispensing grooves are provided with a plurality of pre-dispensing grooves, and at least one of the pre-dispensing grooves is different from the rest of the pre-dispensing grooves in shape and/or different in depth.

Further, in order to better realize the utility model, the following arrangement structure is adopted: the depth of the pre-dispensing groove is not larger than the axial dimension of the limiting protrusion.

Further, in order to better realize the utility model, the following arrangement structure is adopted: the outer peripheral surface of the first butt joint piece is provided with a first positioning protrusion, and the inner peripheral surface of the sheath is provided with a first positioning groove corresponding to the first positioning protrusion and used for positioning the first butt joint piece in the axial direction; and/or the number of the groups of groups,

The outer peripheral surface of the first butt joint piece is also provided with a second positioning protrusion, and the inner peripheral surface of the sheath is provided with a second positioning groove corresponding to the second positioning protrusion, and the second positioning groove is used for positioning the first butt joint piece in the circumferential direction.

Further, in order to better realize the utility model, the following arrangement structure is adopted: the height of the first positioning bulge in the radial direction of the first butting piece is gradually reduced from the proximal end to the distal end of the first butting piece; and/or the number of the groups of groups,

The height of the second positioning protrusion in the radial direction of the first butting piece is gradually reduced from the proximal end to the distal end of the first butting piece.

Further, in order to better realize the utility model, the following arrangement structure is adopted: the end face of the proximal end of the first pair of fasteners is flush with the end face of the proximal end of the sheath, or the end face of the proximal end of the first pair of fasteners exceeds the end face of the proximal end of the sheath.

The application also provides an endoscope, which comprises the endoscope butt joint structure.

Compared with the prior art, the utility model has at least the following technical effects:

According to the endoscope butting structure, the first butting piece is sleeved in the sheath, the first butting piece is in butting connection with the handle shell through the second butting piece, one of the distal end of the handle shell and the proximal end of the first butting piece is provided with the limiting protrusion, the other is provided with the limiting groove, and through the matching of the two limiting protrusions, the limiting matching of the handle shell in the radial direction is realized, and when the handle shell is disassembled in a violent manner, the handle shell is not easy to disassemble; meanwhile, the first butt joint piece is fixed relative to the handle shell, the requirement of rotation in use does not exist, loss can not be generated at the contact part of the first butt joint piece and the handle shell, the radial limit stop effect of the limit protrusion and the limit groove can not be weakened, and the difficulty that the handle shell is violently disassembled is increased.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following description will briefly explain the embodiments of the present utility model 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 utility model, 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 illustration of an endoscope docking structure in accordance with the present utility model;

FIG. 2 is a schematic diagram of a docking structure for an endoscope in accordance with the present utility model;

FIG. 3 is a schematic view of a first docking member according to the present utility model;

FIG. 4 is a schematic diagram of a second embodiment of a first docking member according to the present utility model;

FIG. 5 is a cross-sectional view I of the first abutment of the present utility model taken in the direction A-A;

FIG. 6 is a second cross-sectional view of the first abutment in the direction A-A of the present utility model;

FIG. 7 is a schematic view of the structure of the sleeve of the present utility model;

FIG. 8 is a cross-sectional view I of the sleeve of the present utility model in the direction B-B;

FIG. 9 is a second cross-sectional view of the sleeve of the present utility model in the direction B-B;

FIG. 10 is a cross-sectional view of the docking structure of the present utility model in the C-C direction;

fig. 11 is an enlarged view of the structure of the portion D in fig. 10.

In the figure: 10-a handle housing; 11-an upper housing; 12-a lower housing; 13-limiting protrusions; 131-step surface; 20-a first docking member; 21-a limiting part; 211-a pre-dispensing groove; 212-limiting grooves; 213-a first accommodation chamber; 22-first positioning projections; 23-a second positioning protrusion; 24-clamping grooves; 30-a sheath; 31-a first positioning groove; 32-a second positioning groove; 33-a second accommodation chamber; 34-clamping the protrusion; 40-second docking member.

Detailed Description

The following description provides many different embodiments, or examples, for implementing different features of the utility model. 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 utility model.

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. All other embodiments, based on the embodiments of the utility model, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the utility model. Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model.

In the present utility model, 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; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

In the present utility model, unless expressly stated or limited otherwise, a first feature may include first and second features directly contacting each other, either above or below a second feature, or through additional features contacting each other, rather than directly contacting each other. Moreover, the first feature being above, over, and on the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being below, beneath, and beneath the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is less level than the second feature.

In addition, in the utility model, the 'near end' and the 'far end' are far and near positions of the structure relative to human body operation under the use environment, so that the description of the position relationship among the components is convenient, and meanwhile, the understanding is convenient; for the same component, "proximal" and "distal" are relative positional relationships of the component, not absolute; accordingly, it should be understood from the perspective of implementing the principles of the present utility model without departing from the spirit of the utility model.

The inventor found in the study that in the related art, the distal end of the endoscope handle housing is usually sleeved with a knob, the rotation of the knob is used for controlling the snake bone at the distal end of the insertion part to turn, the knob rotates relative to the housing for a long time, friction is generated between the knob and the distal end surface of the housing in the rotating process, the distal end surface of the housing is worn, the strength of the knob is gradually reduced, the effect of the knob on the housing stop is poor in the violent disassembly process of the housing, and the housing is more easily disassembled violently.

In view of the foregoing, a first aspect of the present application provides an endoscope docking structure, as shown in fig. 1 to 11, comprising: a handle housing 10, a sheath 30 and a first docking piece 20;

The handle housing 10 includes an upper housing 11 and a lower housing 12, the upper housing 11 and the lower housing 12 being butted;

The first docking member 20 is disposed within the sheath 30, the first docking member 20 is configured to connect with the second docking member 40 in the handle housing 10, and the sheath 30 is mounted to the distal end of the handle housing 10 through the first docking member 20;

One of the distal end of the handle housing 10 and the proximal end of the first docking member 20 is provided with a limiting protrusion 13, the other is provided with a limiting groove 212, and the limiting protrusion 13 extends into the limiting groove 212 and is in limiting fit with the other in the radial direction of the docking structure.

In the above embodiment, the handle housing 10 includes the upper housing 11 and the lower housing 12, the upper housing 11 and the lower housing 12 may be assembled and butted together to form the semi-closed handle housing 10, and the upper housing 11 and the lower housing 12 may be butted by clamping, welding, gluing, etc., which is not limited herein.

The endoscope docking structure of the present application further comprises a first docking member 20, a sheath 30, a second docking member 40, all located at the distal end side of the handle housing 10; specifically, the first docking member 20 and the sheath 30 are both hollow, the first docking member 20 has a first accommodating cavity 213, the sheath 30 has a second accommodating cavity 33, the first docking member 20 is embedded in the second accommodating cavity 33 of the sheath 30, and part of the second docking member 40 is embedded in the first accommodating cavity 213, and the other part is located in the handle housing 10 and connected, so that the sheath 30 and the first docking member 20 are connected with the distal end of the handle housing 10 through the second docking member 40. Preferably, the first butting piece 20 and the second butting piece 40 are in threaded connection, but also can be in a clamping manner, and the like, and the method is not limited herein.

Preferably, to achieve a positive stop fit of the proximal end of the first docking member 20 and the distal end of the handle housing 10, both employ a male-female fit for radial stop. Illustratively, a limiting protrusion 13 is formed on the distal end of the handle housing 10, the limiting protrusion 13 extends toward the handle housing 10 away from the axial direction of the distal end, and meanwhile, a limiting groove 212 matched with the limiting protrusion 13 is formed on the proximal end of the first docking member 20, and when the first docking member 20 is docked with the handle housing 10, the limiting protrusion 13 is located in the limiting groove 212. When the handle housing 10 is forcibly removed, the limit projection 13 and the limit groove 212 can limit the handle housing 10 in the radial direction, preventing the handle housing 10 from being forcibly removed.

Therefore, in the endoscope docking structure provided by the application, by arranging the first docking piece 20, the first docking piece 20 is sleeved in the sheath 30, the first docking piece 20 is docked with the handle shell 10 through the second docking piece 40, one of the distal end of the handle shell 10 and the proximal end of the first docking piece 20 is provided with the limit protrusion 13, the other is provided with the limit groove 212, and through the cooperation of the two, the limit cooperation of the handle shell 10 in the radial direction is realized, and when the handle shell 10 is disassembled in a violent manner, the handle shell 10 is not easy to disassemble; meanwhile, the first butt joint piece 20 is fixed relative to the handle shell, the requirement of rotation in use does not exist, loss can not be generated at the contact part of the first butt joint piece 20 and the handle shell, the radial limit stop effect of the limit protrusion 13 and the limit groove 212 can not be weakened, and the difficulty that the handle shell 10 is violently disassembled is increased.

According to some alternative embodiments, the first docking member 20 has a pre-dispensing slot 211 provided at a docking end opposite to the handle housing 10, and the pre-dispensing slot 211 is used for pre-dispensing glue.

In the above embodiment, the first butt joint 20 and the handle housing 10 are usually glued, but glue is usually applied to the end surface of either one of them to bond the two, but the glue easily flows out from the end surface in this way, which causes a problem that the glue is not easy to glue. In view of this, the present application provides the pre-dispensing groove 211 at the abutting end of the first abutting member 20 and the handle housing 10, and the glue solution can be added into the pre-dispensing groove 211, so that the glue solution can be prevented from overflowing, the glue application becomes easy, and the connection between the two becomes more firm.

According to some optional embodiments, the top of the limit groove 212 is provided with the pre-dispensing groove 211, and/or the bottom surface of the inner wall of the limit groove 212 is provided with the pre-dispensing groove 211, and/or the side surface of the inner wall of the limit groove 212 is provided with the pre-dispensing groove 211.

In the above embodiment, the proximal end of the first docking member 20 is provided with the limiting portion 21, the limiting portion 21 is provided with the limiting groove 212, and the limiting groove 212 extends along the proximal end face to the distal end face of the limiting portion 21; the limiting groove 212 is matched with the limiting protrusion 13 on the handle shell 10 to limit, a step surface 131 is formed between the limiting protrusion 13 and the handle shell 10, and the proximal end surface of the limiting part 21 is in butt joint with the step surface 131. Therefore, the pre-dispensing groove 211 may be disposed in at least one of the proximal surface, the bottom surface, and the side surface of the limit groove 212 to achieve the firm adhesion between the first docking member 20 and the handle housing 10.

According to some alternative embodiments, the pre-dispensing slot 211 provided at the top of the limit groove 212 extends along the axial direction of the first docking member 20; the pre-dispensing groove 211 provided on the bottom surface of the inner wall of the limit groove 212 extends along the axial direction of the first abutting part 20; the pre-dispensing groove 211 provided at the side of the limit groove extends along the radial direction of the first abutting member 20. In the injection molding process of the first butt joint part 20, the pre-dispensing groove 211 arranged at the top of the limiting groove 212 and the pre-dispensing groove 211 arranged at the bottom surface can be used for being matched with a mold in a positioning manner, so that injection molding is completed.

According to some alternative embodiments, the pre-dispensing grooves 211 are provided in plurality, at least one of the pre-dispensing grooves 211 is shaped differently and/or has a different depth than the rest of the pre-dispensing grooves 211.

In the above embodiment, the pre-dispensing grooves 211 may be arranged at intervals along the circumferential direction of the limiting groove 212, where at least one pre-dispensing groove 211 is different from the other pre-dispensing grooves 211 in shape, so as to realize foolproof, ensure operation correctness, and improve working efficiency; meanwhile, the pre-dispensing groove 211 performs other functions such as positioning and matching with the grinding tool, and in order to better realize the functions, the depth of the pre-dispensing groove 211 is also set to be different.

According to some alternative embodiments, the depth of the pre-dispensing slot 211 is not greater than the axial dimension of the limit protrusion 13.

In the above embodiment, the axial depth of the pre-dispensing groove 211 is set to be equal to or smaller than the axial dimension of the limit protrusion 13, and the purpose of the present embodiment is that when the handle housing 10 is disassembled violently, the pre-dispensing groove 211 is extruded, so that the strength of the limit groove 212 in the radial direction is reduced, a certain swinging space is provided for the limit protrusion 13 in the radial direction, and the limit protrusion is not easy to be damaged, broken, etc., and is not easy to be disassembled violently.

According to some alternative embodiments, the outer circumferential surface of the first abutting member 20 is provided with a first positioning protrusion 22, and the inner circumferential surface of the sheath 30 is provided with a first positioning groove 31 corresponding to the first positioning protrusion 22 for positioning the first abutting member 20 in the axial direction; and/or the number of the groups of groups,

The outer peripheral surface of the first butt joint part 20 is further provided with a second positioning protrusion 23, and the inner peripheral surface of the sheath 30 is provided with a second positioning groove 32 corresponding to the second positioning protrusion 23, so as to position the first butt joint part 20 in the circumferential direction.

In the above embodiment, the first positioning protrusion 22 is provided on the outer peripheral surface of the first docking member 20, the first positioning groove 31 is provided on the inner peripheral surface of the sheath 30, and when the first docking member 20 is mounted on the sheath 30, the first positioning protrusion 22 is embedded into the first positioning groove 31, so that the first docking member 20 and the sheath 30 can be positioned in the axial direction and cannot move in the axial direction; similarly, the second positioning protrusion 23 may be disposed on the outer peripheral surface of the first docking member 20, and the second positioning groove 32 may be disposed on the inner peripheral surface of the sheath 30, so that when the first docking member 20 is mounted on the sheath 30, the second positioning protrusion 23 may be embedded into the second positioning groove 32, so that the first docking member 20 and the sheath 30 may be positioned in the circumferential direction and not rotate in the circumferential direction, so as to ensure the fixed connection therebetween.

Alternatively, a first positioning groove may be formed on the outer peripheral surface of the first docking member 20, and a first positioning protrusion corresponding to the first positioning groove may be formed on the inner peripheral surface of the sheath 30, for positioning the first docking member 20 in the axial direction; and/or the number of the groups of groups,

The outer peripheral surface of the first butt joint part 20 is further provided with a second positioning groove, and the inner peripheral surface of the sheath 30 is provided with a second positioning protrusion corresponding to the second positioning groove, so as to position the first butt joint part in the circumferential direction.

According to some alternative embodiments, the height of the first positioning protrusion 22 in the radial direction of the first docking member 20 decreases along the proximal end to the distal end of the first docking member 20; and/or the number of the groups of groups,

The height of the second positioning protrusion 23 in the radial direction of the first docking member 20 decreases from the proximal end to the distal end of the first docking member 20.

In the above embodiment, the first docking member 20 has the first accommodating cavity 213, the insertion portion may pass through the first accommodating cavity 213 through the second docking member 40, and when the insertion portion is at the distal end portion of the first accommodating cavity 213, the outer portion of the insertion portion is not wrapped by the second docking member 40, and at this time, in order to ensure that the insertion portion does not shake in the first accommodating cavity 213, the size of the distal end portion of the first accommodating cavity 213 may be reduced. Correspondingly, the height of the first positioning protrusion 22 in the radial direction of the first docking member 20 is set to be gradually decreased from the proximal end to the distal end of the first docking member 20, such as h1> h2> h3. Meanwhile, a clamping groove 24 is formed between adjacent first positioning protrusions 22 on the outer peripheral surface of the first butt joint piece 20, a clamping protrusion 34 is formed on an adjacent first positioning groove 31 on the inner peripheral surface of the sheath 30, the clamping groove 24 and the clamping protrusion 34 are connected in a matched mode, the depth of the clamping groove 24 increases gradually along the proximal end of the first butt joint piece 20 to the distal end, the protrusion height of the clamping protrusion 34 increases gradually along the proximal end of the sheath to the distal end, a better clamping effect is achieved, and the space of the first butt joint piece 20 is utilized.

Similarly, the height of the second positioning protrusion 23 in the radial direction of the first abutment 20 decreases from the proximal end to the distal end of the first abutment 20, so that a better connection between the first abutment 20 and the sheath 30 can be achieved.

According to some alternative embodiments, the end face of the proximal end of the first docking element 20 is flush with the end face of the proximal end of the sheath 30, or the end face of the proximal end of the first docking element 20 exceeds the end face of the proximal end of the sheath 30.

In the above embodiment, the proximal end face of the first butting member 20 is arranged to be flush with or exceed the proximal end face of the sheath 30, so that when the handle housing 10 is disassembled violently, the step face 131 of the handle housing 10 is butted with the proximal end face of the first butting member 20, and the glue solution in the pre-dispensing groove 211 can be fully contacted and adhered with the step face; secondly, it is ensured that the first abutment 20 is deformed first when the handle housing 10 is violently removed, with reduced impact on the sheath 30.

The application also provides an endoscope, which comprises the endoscope butt joint structure.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Furthermore, it should be noted that the scope of the methods and apparatus in the embodiments of the present application is not limited to performing the functions in the order shown or discussed, but may also include performing the functions in a substantially simultaneous manner or in an opposite order depending on the functions involved, e.g., the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

The foregoing description of the preferred embodiments of the utility model 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 utility model.

Claims (10)

1. An endoscope butt-joint structure, characterized by comprising the following steps: a handle housing (10), a sheath (30) and a first docking member (20);

The handle housing (10) comprises an upper housing (11) and a lower housing (12), wherein the upper housing (11) and the lower housing (12) are in butt joint;

The first butt joint piece (20) is arranged in the sheath (30), the first butt joint piece (20) is used for being connected with the second butt joint piece (40) in the handle shell (10), and the sheath (30) is arranged at the far end of the handle shell (10) through the first butt joint piece (20);

One of the distal end of the handle housing (10) and the proximal end of the first abutting part (20) is provided with a limiting protrusion (13), the other is provided with a limiting groove (212), the limiting protrusion (13) stretches into the limiting groove (212), and the two are in limiting fit in the radial direction of the abutting structure.

2. Docking structure according to claim 1, characterized in that the first docking member (20) has a pre-dispensing groove (211) provided at the docking end opposite the handle housing (10), the pre-dispensing groove (211) being adapted to pre-dispense glue.

3. Docking structure according to claim 2, characterized in that the top of the limit groove (212) is provided with the pre-dispensing groove (211), and/or the bottom surface of the limit groove (212) inner wall is provided with the pre-dispensing groove (211), and/or the side surface of the limit groove (212) inner wall is provided with the pre-dispensing groove (211).

4. A docking structure according to claim 3, characterized in that the pre-dispensing slot (211) provided at the top of the limit groove (212) extends in the axial direction of the first docking member (20); the pre-dispensing groove (211) is formed in the bottom surface of the inner wall of the limiting groove (212) and extends along the axial direction of the first butt joint part (20); and the pre-dispensing groove (211) is also used for being matched with a mould in a positioning way in the injection molding process.

5. Docking structure according to claim 2, characterized in that the pre-dispensing grooves (211) are provided in a plurality, at least one of the pre-dispensing grooves (211) being shaped differently and/or having a different depth than the remaining pre-dispensing grooves (211).

6. Docking structure according to claim 2, characterized in that the depth of the pre-dispensing groove (211) is not greater than the axial dimension of the limit projection (13).

7. The docking structure according to claim 1, wherein an outer peripheral surface of the first docking member (20) is provided with a first positioning projection (22), and a first positioning groove (31) corresponding to the first positioning projection (22) is provided on an inner peripheral surface of the sheath (30) for positioning the first docking member (20) in an axial direction; and/or the number of the groups of groups,

The outer peripheral surface of the first butt joint piece (20) is further provided with a second positioning protrusion (23), and the inner peripheral surface of the sheath (30) is provided with a second positioning groove (32) corresponding to the second positioning protrusion (23) for positioning the first butt joint piece (20) in the circumferential direction.

8. Docking structure according to claim 7, characterized in that the height of the first positioning protrusion (22) in the radial direction of the first docking member (20) decreases along the proximal end to distal end of the first docking member (20); and/or the number of the groups of groups,

The height of the second positioning protrusion (23) in the radial direction of the first butting piece (20) decreases along the proximal end to the distal end of the first butting piece (20).

9. Docking structure according to claim 1, characterized in that the end face of the proximal end of the first docking element (20) is flush with the end face of the proximal end of the sheath (30), or that the end face of the proximal end of the first docking element (20) exceeds the end face of the proximal end of the sheath (30).

10. An endoscope comprising the endoscope docking structure of any one of claims 1-9.